CN107092383B - touch processor - Google Patents

Abstract

The present invention relates to a touch processor, a touch screen signal measurement method and a device, wherein each or each group of driving conductive strips of the touch screen corresponds to a delayed phase difference. Each time a driving signal is provided, at least one of the detection conductive strips measures a signal after delaying the delayed phase difference of one or a group of driving conductive strips to which the driving signal is provided.

Description

touch processor

This application is a divisional application for an invention patent application with the application number of 201310025203.1 entitled "Signal Measurement Method and Device for Touch Screen". The application date of the original application is January 23, 2013.

technical field

The present invention relates to a measuring method and device for a capacitive touch screen, in particular to a measuring method and device for a capacitive touch screen that compensates for the phase delay of a resistance-capacitance circuit.

Background technique

The capacitive touch screen uses capacitive coupling with the human body to cause changes in the detection signal, thereby judging the position where the human body touches the capacitive touch screen. When the human body touches, the noise of the environment in which the human body is located will also be injected along with the capacitive coupling between the human body and the capacitive touch screen, which also changes the detection signal. Also, since the noise is constantly changing, it is not easy to predict. When the signal-to-noise ratio is small, it is easy to cause inability to determine the touch, or a deviation in the determined touch position.

In addition, since the signal passes through some load circuits, such as through capacitive coupling, a phase difference occurs between the signal received by the detection busbar and the signal provided before the driving busbar. When the periods of the driving signals are all the same, different phase differences indicate that the signals are received with different time delays. If the aforementioned phase differences are ignored and the signals are directly measured, the starting phases of the signal measurement will be different, resulting in different results. If the measurement results corresponding to different conductive strips are very different, it will be difficult to determine the correct position.

It can be seen that the above-mentioned prior art still has inconvenience and defects in structure and use, and needs to be further improved. Therefore, how to create a signal measurement method and device for a touch screen with a new structure has also become a target that needs to be improved in the current industry.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the defects of the existing technology, and provide a signal measurement method and device for a touch screen with a new structure. There will be delays due to different loads passing through. If such delays are ignored, the detected signals will not meet expectations. The purpose of the present invention is to give different delay times (or phase differences) corresponding to different driving conductive strips, so as to optimize or level the signal of the shadow detected by the touch screen.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. A signal measurement method for a touch screen according to the present invention includes: providing a touch screen, the touch screen includes a plurality of conductive strips formed by a plurality of parallelly arranged driving conductive strips and a plurality of parallelly arranged detection conductive strips, the said The driving conductive strips and the detection conductive strips are overlapped in a plurality of overlapping areas; the delay phase difference of each or each group of the driving conductive strips is determined; the driving signals are sequentially provided to one of the driving conductive strips or a group, the driving conductive strip provided with the driving signal and the detection conductive strip generate mutual capacitive coupling; and each time the driving signal is provided, the delay corresponding to one or a group of driving conductive strips provided with the driving signal The signal is measured by at least one of the detection conductive strips after the delay phase difference of the strips.

The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

The aforementioned signal measurement method is characterized in that determining the delay phase difference of each or each group of driving conductive strips comprises: sequentially selecting one or a group of conductive strips of the driving conductive strips as the selected conductive strips; The delay phase difference of the selected conductive strip is selected from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected conductive strip, the signal measured after delaying the delay phase difference is larger than the delay phase difference of other predetermined phase differences. detected signal.

The aforementioned signal measurement method is characterized in that when the driving signal is provided to the selected conductive strip, the signals measured by a plurality of the detection conductive strips are measured by one of the detection conductive strips. The sum of the measured signals.

The aforementioned signal measurement method is characterized in that when the driving signal is provided to the selected conductive strips, the signals measured by a plurality of the detection conductive strips are obtained from at least two of the detection conductive strips. The bar detection is the sum of the signals measured by the conductive bars.

The aforementioned signal measurement method is characterized in that determining the delay phase difference of each or each group of driving conductive strips comprises: selecting one or a group of the driving conductive strips as the reference conductive strip, and the other strips or other groups. The conductive strip is used as a non-reference conductive strip; the delay phase difference of the reference conductive strip is selected from a plurality of predetermined phase differences, wherein when the driving signal is provided to the reference conductive strip, the signal detected after delaying the delay phase difference is greater than Delay the signal detected after the other predetermined phase difference; use the signal detected after the delay phase difference of the reference conductive strip as the reference signal; select one or a group of non-reference conductive strips in sequence The strip is used as the selected conductive strip; and the delayed phase difference of the selected conductive strip is selected from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected conductive strip, the delay phase difference detected after delaying the delay phase difference The signal is closest to the reference signal compared to the signal detected after being delayed by other predetermined phase differences.

The aforementioned signal measurement method is characterized in that when the driving signal is provided to the reference conductive strip or the selected conductive strip, the signals measured by a plurality of the detection conductive strips are measured by the detection conductive strip. The signal measured by one of the bars.

The aforementioned signal measurement method is characterized in that when the driving signal is provided to the reference conductive strip or the selected conductive strip, the signals measured by a plurality of the detection conductive strips are measured by the detection conductive strip. The sum of the signals measured by the at least two detection strips of the strips.

The purpose of the present invention and the technical problem to be solved are also achieved by the following technical solutions. A signal measurement method for a touch screen according to the present invention includes: providing a touch screen, the touch screen includes a plurality of conductive strips formed by a plurality of parallelly arranged driving conductive strips and a plurality of parallelly arranged detection conductive strips, the said The driving conductive strips and the detecting conductive strips are overlapped in a plurality of overlapping areas; each or each group of the driving conductive strips and each or each group of the detecting conductive strips are respectively overlapped as the detection combination; The delay phase difference of each detection combination; sequentially provide the driving signal to one or a group of the driving conductive strips, the driving conductive strip provided with the driving signal in the detection combination provided with the driving signal and the overlapping The detection conductive strips generate mutual capacitive coupling; and each time the driving signal is provided, the signal of each detection combination of the provided driving signal is delayed by a corresponding phase difference before being measured.

The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

The aforementioned signal measurement method is characterized in that determining the delay phase difference of each detection combination comprises: sequentially selecting one of the detection combinations as the selected detection combination; and selecting from a plurality of predetermined phase differences The delay phase difference of the selected detection combination, wherein when the driving signal is provided to the selected detection combination, the signal measured after delaying the delay phase difference is greater than the signal detected after delaying other predetermined phase differences.

The aforementioned signal measurement method is characterized in that determining the delay phase difference of each detection combination comprises: selecting one of the detection combinations as a reference detection combination, and the other detection combinations as non-reference detection combinations; The delay phase difference of the reference detection combination is selected from the predetermined phase differences, wherein when the driving signal is provided to the reference detection combination, the signal detected after delaying the delay phase difference is greater than that detected after delaying other predetermined phase differences The received signal; the signal detected after the delay phase difference is delayed by the reference detection combination as the reference signal; one of the non-reference detection combinations is sequentially selected as the selected detection combination; and a plurality of predetermined The delay phase difference of the selected detection combination is selected from the phase differences, wherein when the driving signal is provided to the selected detection combination, the signal detected after the delay phase difference is delayed compared with the delayed phase difference of other predetermined phase differences. The detected signal is closest to the reference signal.

The purpose of the present invention and the technical problem to be solved are further achieved by the following technical solutions. A signal measuring device for a touch screen according to the present invention includes: a touch screen, including a plurality of conductive strips composed of a plurality of parallelly arranged driving conductive strips and a plurality of parallelly arranged detection conductive strips, the driving conductive strips The strips and the detection conductive strips overlap in a plurality of overlapping areas; the driving circuit sequentially provides driving signals to one or a group of the driving conductive strips, and the driving conductive strips provided with the driving signals are connected to all the driving conductive strips. The detection conductive strips produce mutual capacitive coupling, wherein each or each group of the driving conductive strips corresponds to the delay phase difference; and the detection circuit determines the delayed phase difference of each or each group of the driving conductive strips When the driving signal is provided, the signal is measured by at least one detection conductive strip of the detection conductive strip after delaying the delay phase difference corresponding to one or a group of driving conductive strips provided with the driving signal.

The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

The aforementioned signal measurement device is characterized in that the driving circuit further comprises a device for sequentially selecting one or a group of the driving conductive strips as the selected conductive strips, and the detection circuit further comprises a plurality of predetermined phase differences. The device for selecting the delay phase difference of the selected conductive strips, wherein when the driving signal is provided to the selected conductive strips, the signal measured after delaying the delay phase difference is greater than the detected signal after delaying other predetermined phase differences. Signal.

The aforementioned signal measuring device is characterized in that when the driving signal is provided to the selected conductive strips, the signals measured by a plurality of the detection conductive strips are measured by one of the detection conductive strips. The sum of the measured signals.

The aforementioned signal measurement device is characterized in that when the driving signal is provided to the selected conductive strips, the signals measured by a plurality of the detection conductive strips are obtained from at least two of the detection conductive strips. The bar detection is the sum of the signals measured by the conductive bars.

The aforementioned signal measuring device is characterized in that the driving circuit selects one or a group of the driving conductive strips as the reference conductive strip, and uses other strips or other groups of conductive strips as the non-reference conductive strips, and the driving circuit One or a group of non-reference conductive strips of the non-reference conductive strips are sequentially selected as the selected conductive strips; the detection circuit selects the delay phase difference of the reference conductive strips from a plurality of predetermined phase differences. When provided to the reference conductive strip, the signal detected after delaying the delay phase difference is greater than the signal detected after delaying other predetermined phase differences, and the detection circuit is based on the reference conductive strip delaying the delay phase difference and then detecting the signal. The measured signal is used as the reference signal, and the delay phase difference of the selected conductive strip is selected from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected conductive strip, the detected delay phase difference is delayed after the delay phase difference. The signal is closest to the reference signal compared to the signal detected after being delayed by other predetermined phase differences.

The aforementioned signal measurement device is characterized in that when the driving signal is provided to the reference conductive strip or the selected conductive strip, the signals measured by a plurality of the detection conductive strips are measured by the detection conductive strip. The signal measured by one of the bars.

The aforementioned signal measurement device is characterized in that when the driving signal is provided to the reference conductive strip or the selected conductive strip, the signals measured by a plurality of the detection conductive strips are measured by the detection conductive strip. The sum of the signals measured by the at least two detection strips of the strips.

The purpose of the present invention and the technical problem to be solved are also achieved by the following technical solutions. A signal measuring device for a touch screen according to the present invention includes: a touch screen, including a plurality of conductive strips composed of a plurality of parallelly arranged driving conductive strips and a plurality of parallelly arranged detection conductive strips, the driving conductive strips The strips and the detection conductive strips overlap in a plurality of overlapping areas; the driving circuit sequentially provides driving signals to one or a group of the driving conductive strips, and is provided with the driving signals in the detection combination. The driving conductive strips providing the driving signal and the overlapping detection conductive strips generate mutual capacitive coupling, wherein each or each group of the driving conductive strips and respectively overlap each or each group of the detection conductive strips as a detection combination and Each detection combination corresponds to a delayed phase difference; and each time the detection circuit is provided with a driving signal, the signal of each detection combination provided with the driving signal is delayed by the corresponding phase difference before being measured.

The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

The aforementioned signal measurement device is characterized in that the driving circuit sequentially selects one of the detection combinations as the selected detection combination; and the detection circuit selects the delay of the selected detection combination from a plurality of predetermined phase differences Phase difference, wherein when the driving signal is provided to the selected detection combination, the signal measured after delaying the delay phase difference is greater than the signal detected after delaying other predetermined phase differences.

The aforementioned signal measurement device is characterized in that the driving circuit selects one of the detection combinations as a reference detection combination, and the other detection combinations as non-reference detection combinations, and the driving circuit selects the non-reference detection combinations in sequence. One of the detection combinations is used as the selected detection combination; and the detection circuit selects the delay phase difference of the reference detection combination from a plurality of predetermined phase differences, wherein when the driving signal is provided to the reference detection combination, the delay of the The signal detected after delaying the phase difference is greater than the signal detected after delaying other predetermined phase differences, and the detection circuit uses the signal detected after delaying the delay phase difference by the reference detection combination as the reference signal, and is composed of multiple The delay phase difference of the selected detection combination is selected from the predetermined phase differences, wherein when the driving signal is provided to the selected detection combination, the detected signal after the delay phase difference is delayed compared with other predetermined phases. The detected signal after the difference is closest to the reference signal.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. It can be seen from the above technical solutions that the main technical contents of the present invention are as follows: a signal measurement method for a touch screen proposed according to the present invention includes: providing a touch screen, and the touch screen includes a plurality of driving conductive strips arranged in parallel and a plurality of detection strips arranged in parallel. detecting a plurality of conductive strips composed of conductive strips, the driving conductive strips and the detecting conductive strips overlap in a plurality of overlapping areas; determining a retardation phase difference of each or each group of driving conductive strips; according to sequentially providing a driving signal to one or a group of the driving conductive strips, and the driving conductive strip provided with the driving signal and the detecting conductive strip generate mutual capacitive coupling; and each time the driving signal is provided, The signal is measured by at least one detection conductive strip of the detection conductive strip after the delay corresponds to the delayed phase difference of one or a group of driving conductive strips provided with the driving signal. A signal measurement method of a touch screen according to the present invention includes: providing a touch screen, the touch screen includes a plurality of conductive strips formed by a plurality of parallelly arranged driving conductive strips and a plurality of parallelly arranged detection conductive strips, the driving The conductive strips and the detection conductive strips overlap in a plurality of overlapping areas; use each or each group of driving conductive strips and overlap each or each group of detection conductive strips respectively as a detection combination; determine each A delay phase difference of a detection combination; sequentially provide a driving signal to one or a group of the driving conductive strips, and in the detection combination provided with the driving signal, the driving conductive strip provided with the driving signal and the overlapping detection strip The detection strips generate mutual capacitive coupling; and each time the driving signal is provided, the signal of each detection combination of the provided driving signal is delayed by a corresponding phase difference before being measured. A signal measuring device for a touch screen according to the present invention includes: a touch screen, including a plurality of parallel-arranged driving conductive strips and a plurality of parallel-arranged detection conductive strips composed of a plurality of conductive strips, the driving conductive strips overlapping with the detection conductive strips in a plurality of overlapping areas; the driving circuit sequentially provides driving signals to one or a group of the driving conductive strips, and the driving conductive strips provided with the driving signals are connected to the driving conductive strips. The detection conductive strips produce mutual capacitive coupling, wherein each or each group of driving conductive strips corresponds to the delay phase difference; and the detection circuit determines the delayed phase difference of each or each group of driving conductive strips and drives the When the signal is provided, the signal is measured by at least one detection conductive strip of the detection conductive strip after a delay corresponding to the delay phase difference of one or a group of driving conductive strips provided with the driving signal. A signal measuring device for a touch screen according to the present invention includes: a touch screen, including a plurality of driving conductive strips arranged in parallel and a plurality of parallel conductive strips composed of a plurality of detection conductive strips, the driving conductive strips overlapping with the detection conductive strips in a plurality of overlapping areas; the driving circuit sequentially provides driving signals to one or a group of the driving conductive strips, and is provided in the detection combination of the provided driving signals The driving conductive strips of the driving signal and the overlapping detection conductive strips generate mutual capacitive coupling, wherein each or each group of the driving conductive strips and each or each group of the detection conductive strips are respectively overlapped as a detection combination and each A detection combination corresponds to the delayed phase difference; and each time the driving signal is provided by the detection circuit, the signal of each detection combination of the provided driving signal is delayed by the corresponding phase difference before being measured.

With the above technical solutions, the signal measurement method and device for the touch screen of the present invention have at least the following advantages and beneficial effects: different delay times (or phase differences) are given to different driving conductive strips, so that the signals detected by the touch screen can be improved. Phase signal optimization or leveling.

The above description is only an overview of the technical solutions of the present invention, in order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand , the following specific preferred embodiments, and in conjunction with the accompanying drawings, are described in detail as follows.

Description of drawings

FIG. 1 and FIG. 4 are schematic diagrams of the capacitive touch screen and its control circuit of the present invention;

2A is a schematic diagram of a single-electrode drive mode;

2B and 2C are schematic diagrams of the two-electrode drive mode;

3A and 3B are schematic flowcharts of a detection method for detecting a capacitive touch screen according to the present invention;

5 is a schematic diagram of generating a complete image;

6 is a schematic diagram of generating an inset image;

7A and 7B are schematic diagrams of generating an expanded image;

FIG. 8 is a schematic flow chart of generating an expanded image according to the present invention;

FIG. 9A and FIG. 9B are schematic diagrams illustrating that driving signals generate different phase differences through different driving conductive strips; and

10 and 11 are schematic flowcharts of a signal measurement method for a touch screen according to the first embodiment of the present invention.

【Description of main component symbols】

11: Frequency circuit 12: Pulse width adjustment circuit

131: Drive switch 132: Detect switch

141: Drive selection circuit 142: Detection selection circuit

151: Drive electrode 152: Detection electrode

16: Variable resistor 17: Amplifier circuit

18: Measurement circuit 19: External conductive object

41: Drive circuit 42: Detection circuit

43: Storage circuit 44: Frequency setting

51: Complete image 52: One-dimensional sensing information driven by a single electrode

61: Miniature image 62: One-dimensional sensing information driven by two electrodes

71: External image 45: Controller

721: One-dimensional sensing information driven by a single electrode on the first side

722: One-dimensional sensing information driven by a single electrode on the second side

S: drive signal

Detailed ways

In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following describes the specific implementation, structure, Features and their effects are described in detail below.

Capacitive touch screens are susceptible to noise interference, especially from the human body touching the touch screen. The present invention adopts an adaptive driving manner to achieve the purpose of reducing noise interference.

In a capacitive touch screen, a plurality of electrodes arranged vertically and horizontally are used to detect the touch position, and the power consumption is positively related to the number of electrodes driven at the same time and the driving voltage. During touch detection, noise may be conducted to the capacitive touch screen along with the touched conductors, so that the signal-to-noise ratio (S/N ratio) is deteriorated, and it is easy to cause misjudgment and position deviation of the touch. In other words, the signal-to-noise ratio changes dynamically with the object being touched and the environment it is in.

Please refer to FIG. 1 , which is a schematic diagram of the capacitive touch screen and its control circuit of the present invention, including a frequency circuit 11 , a pulse width adjustment circuit 12 , a drive switch 131 , a detection switch 132 , a drive selection circuit 141 , and a detection selection circuit 142. At least the drive electrode 151, at least the detection electrode 152, the variable resistor 16, the amplifier circuit 17 and the measurement circuit 18. The capacitive touch screen may include a plurality of driving electrodes 151 and a plurality of detecting electrodes 152 , and the driving electrodes 151 and the detecting electrodes 152 are overlapped at a plurality of overlapping places.

The frequency circuit 11 provides a frequency signal for the entire system according to the operating frequency, and the pulse width adjustment circuit 12 provides a pulse width adjustment signal according to the frequency signal and the pulse width adjustment parameter to drive the driving electrodes 151 . The driving switch 131 controls the driving of the driving electrodes, and at least one driving electrode 151 is selected by the selection circuit 141 . In addition, the detection switch 132 controls the electrical coupling between the drive electrodes and the measurement circuit 18 . When the drive switch 131 is turned on, the detection switch 132 is turned off, the pulse width adjustment signal is provided to the drive electrode 151 coupled by the drive selection circuit 141 via the drive selection circuit 141 , wherein the drive electrode 151 can is multiple, and the selected driving electrode 151 may be one, two, or more than one of the driving electrodes 151 . When the driving electrodes 151 are driven by the pulse width adjustment signal, capacitive coupling is generated at the overlap of the detection electrodes 152 and the driven driving electrodes 151 , and each detection electrode 152 is capacitively coupled with the driving electrodes 151 input signal is provided. The variable resistor 16 provides impedance according to the resistance parameter, and the input signal is provided to the detection selection circuit 142 via the variable resistor 16 , and the detection selection circuit 142 selects one, two, three, or multiple detection electrodes 152 Or all the detection electrodes 152 are coupled to the amplifier circuit 17 , and the input signal is provided to the measurement circuit 18 through the amplifier circuit 17 according to the gain parameter. The measurement circuit 18 detects the input signal according to the pulse width adjustment signal and the frequency signal, wherein the measurement circuit 18 may sample the detection signal at least the phase according to the phase parameter. For example, the measurement circuit 18 may have at least an integrating circuit, Each integrating circuit integrates the input signal in the input signal at least in phase according to the phase parameter, so as to measure the magnitude of the input signal. In an example of the present invention, each integrating circuit may further integrate the signal difference of a pair of input signals in the input signal at least in phase according to the phase parameter, or integrate the signal difference between the input signals at least in phase according to the phase parameter, respectively. The difference of the signal differences of two pairs of input signals is integrated. In addition, the measurement circuit 18 may also include an analog-to-digital converter (ADC) to convert the result detected by the integrating circuit into a digital signal. In addition, those of ordinary skill in the art can infer that the aforementioned input signal may be amplified by the amplifying circuit 17 and then provided to the measuring circuit 18 by the detection selection circuit 142, which is not limited in the present invention.

In the present invention, the capacitive touch screen has at least two driving modes, which are divided into the single-electrode driving mode and the two-electrode driving mode, which are the most power-saving, and have at least one driving potential. Each driving mode has at least one operating frequency corresponding to different driving potentials, each operating frequency corresponds to a set of parameters, and each driving mode corresponding to different driving potentials represents different degrees of power consumption.

The electrodes of the capacitive touch screen can be divided into a plurality of driving electrodes 151 and a plurality of detecting electrodes 152 , and the driving electrodes 151 and the detecting electrodes 152 are overlapped at a plurality of intersections. Referring to FIG. 2A , in the single-electrode driving mode, one driving electrode 151 is driven at a time, that is, only one driving electrode 151 is supplied with the driving signal S at the same time, and when any driving electrode 151 is driven, all detection electrodes are detected. 152 to generate a one-dimensional sensing information. Accordingly, after driving all the driving electrodes 151 , one-dimensional sensing information corresponding to each driving electrode 151 can be obtained, so as to form a complete image relative to all overlapping positions.

Referring to FIGS. 2B and 2C, in the two-electrode driving mode, a pair of adjacent driving electrodes 151 are driven at one time. In other words, the n driving electrodes 151 are driven n-1 times in total, and when any pair of the driving electrodes 151 is driven, the signals of all the detection electrodes 152 are detected to generate one-dimensional sensing information. For example, firstly, as shown in FIG. 2B , the driving signal S is provided to the first pair of driving electrodes 151 at the same time, and if there are 5 driving electrodes, the driving signal S should be driven 4 times. Next, as shown in FIG. 2C, the driving signal S is simultaneously provided to the second pair of driving electrodes 151, and so on. Accordingly, after driving each pair of driving electrodes 151 (n-1 pairs in total), one-dimensional sensing information corresponding to each pair of driving electrodes 151 can be obtained, so as to form an inset image relative to the aforementioned complete image. The number of pixels of the miniature image is smaller than the number of pixels of the full image. In another example of the present invention, the two-electrode driving mode further includes single-electrode driving of the two-side driving electrodes 151 respectively, and when either side of the single-driving electrodes 151 is driven, detecting the signals of all the detecting electrodes 152 to generate One 1D sensing information is provided to additionally provide two 1D sensing information, and the inner zoom image forms an external expansion image. For example, the one-dimensional sensing information corresponding to the two sides are respectively placed outside the two sides of the indented image to form the expanded image.

Those with ordinary knowledge in the technical field can infer that the present invention may further include a three-electrode driving mode, a four-electrode driving mode, etc., which will not be described here.

The aforementioned driving potentials may include, but are not limited to, at least two driving potentials, such as a low driving potential and a high driving potential, and a higher driving potential has a higher signal-to-noise ratio.

According to the foregoing, in the single-electrode driving mode, a complete image can be obtained, and in the two-electrode driving mode, an inwardly zoomed-in image or an outwardly enlarged image can be obtained. The complete image, inner miniature or expanded image can be obtained when the external conductive object 19 approaches or touches the capacitive touch screen, so as to generate the variation of each pixel to determine the position of the external conductive object 19 . Wherein, the external conductive objects 19 may be one or more. As mentioned above, when the external conductive object 19 approaches or touches the capacitive touch screen, or capacitively couples with the drive electrodes 151 and the detection electrodes 152, noise interference is caused, even when the drive electrodes 151 are not driven, the external The conductive object 19 may also be capacitively coupled to the drive electrodes 151 and the detection electrodes 152 . In addition, noise may also interfere from other sources.

Accordingly, in an example of the present invention, when the noise detection process is performed, the drive switch 131 is turned off, and the detection switch 132 is turned on. At this time, the measurement circuit can generate noise according to the signal of the detection electrode 152 The detected one-dimensional sensing information is used to determine whether the noise interference is within the allowable range. For example, it can be determined whether any value of the one-dimensional sensing information of noise detection exceeds the threshold value, or whether the sum or average of all the values of the one-dimensional sensing information of noise detection exceeds the threshold value, to Determine whether the noise interference is within the allowable range. Those with ordinary knowledge in the art can infer other ways to determine whether the noise interference conforms to the allowable range by using the one-dimensional sensing information of noise detection, which is not described in the present invention.

The noise detection procedure can be performed when the system is activated or every time the aforementioned complete image, indented image or externally expanded image is acquired, or can be performed periodically or when the aforementioned complete image, indented image or externally enlarged image is acquired multiple times It is performed when an external conductive object is approached or touched. Those skilled in the art can infer other appropriate timings for performing the noise detection process, which is not limited in the present invention.

The present invention additionally provides a frequency switching procedure, which is to perform frequency switching when it is judged that the noise interference exceeds the allowable range. The measurement circuit is provided with a plurality of sets of frequency settings, which may be stored in a memory or other storage media, so as to provide the measurement circuit to select in the frequency conversion process, and to control the frequency signal of the frequency circuit 11 according to the selected frequency. The frequency switching process may be to select appropriate frequency settings one by one in the frequency settings, for example, select one set of frequency settings one by one and perform a noise detection process until the detected noise interference meets the allowable range. The frequency changing procedure may also select the best frequency setting one by one from the frequency setting. For example, the frequency settings are selected one by one and a noise detection process is performed to detect the frequency settings with the least noise interference. For example, the maximum value of the one-dimensional sensing information of noise detection is detected as the minimum frequency setting. , or the sum or average of all the values of the one-dimensional sensing information of noise detection is the minimum frequency setting.

The frequency setting corresponds to including but not limited to drive mode, frequency and parameter group. The parameter group may include but is not limited to be selected from the following set groups: the aforementioned resistance parameters, the aforementioned gain parameters, the aforementioned phase parameters and the aforementioned pulse width adjustment parameters. Those of ordinary skill in the art can infer other suitable capacitance-type parameters. Related parameters of touch screen and its control circuit.

The frequency setting can be as shown in Table 1 below, including multiple driving potentials. The following takes the first driving potential and the second driving potential as examples, and those with ordinary knowledge in the technical field can infer that there may be more than three types of frequency settings. drive potential. Each driving potential may have a plurality of driving modes, including but not limited to a group selected from the following sets: single-electrode driving mode, dual-electrode driving mode, three-electrode driving mode, four-electrode driving mode, and the like. Each driving mode corresponding to each driving potential has a plurality of frequencies, and each frequency corresponds to one of the aforementioned parameter groups. Those with ordinary knowledge in the art can infer that the frequency of each driving mode corresponding to each driving potential may be completely different or partially the same, which is not limited in the present invention. Table 1

According to the above, the present invention provides a detection method for detecting a capacitive touch screen, please refer to FIG. 3A . First, as shown in step 310, a plurality of frequency settings are sequentially stored according to the power consumption, each frequency setting corresponds to a driving mode of a driving potential, and each frequency setting has a frequency and a parameter group, Among them, there is at least one driving potential. Next, as shown in step 320, the setting of the detection circuit is initialized according to a parameter set of one of the frequency settings, and as shown in step 330, according to the parameter set of the detection circuit, the detection circuit detects a signal from the detection circuit. The signal from the detection electrode is generated, and a one-dimensional sensing information is generated according to the signal from the detection electrode. Next, as shown in step 340, it is determined whether the interference of the noise exceeds the allowable range according to the one-dimensional sensing information. Then, as shown in step 350, when the interference of the noise exceeds the allowable range, the operating frequency and the detection circuit are respectively changed in sequence according to the frequency and parameter set of one of the frequency settings. After setting, the one-dimensional sensing information is generated, and whether the interference of the noise exceeds the allowable range is determined according to the one-dimensional sensing information, until the interference of the noise does not exceed the allowable range. Alternatively, as shown in step 360 of FIG. 3B , when the interference of the noise exceeds the allowable range, the operating frequency and the setting of the detection circuit are respectively changed according to the frequency and parameter group set for each frequency. The one-dimensional sensing information is finally generated, and the interference of the noise is judged according to the one-dimensional sensing information, and the operating frequency and the parameter set are respectively changed according to the frequency set by the frequency with the least interference by the noise. and the setting of the detection circuit.

For example, as shown in FIG. 4 , it is a detection device for detecting a capacitive touch screen according to the present invention, including: a storage circuit 43 , a driving circuit 41 , and a detection circuit 42 . As shown in the aforementioned step 310, the storage circuit 43 includes a plurality of frequency settings 44, which are respectively stored in order according to the power consumption. The storage circuit 43 may be a circuit, a memory or any storage medium capable of storing electromagnetic records. In the example of the present invention, the frequency setting 44 may be configured in a table look-up manner. In addition, the frequency setting 44 may also store power consumption parameters.

The driving circuit 41 may be an integration of multiple circuits, including but not limited to the aforementioned frequency circuit 11 , the pulse width adjustment circuit 12 , the driving switch 131 , the detection switch 132 and the driving selection circuit 141 . The circuits listed in this example are for the convenience of description of the present invention, and the driving circuit 41 may include only part of the circuits or add more circuits, which is not limited by the present invention. The driving circuit is used to provide driving signals to at least the driving electrodes 151 of the capacitive touch screen according to the operating frequency. The capacitive touch screen includes a plurality of driving electrodes 151 and a plurality of detecting electrodes 152. The driving electrodes 151 and the detecting The sensing electrodes 152 are overlapped at a plurality of overlaps.

The detection circuit 42 may be an integration of multiple circuits, including but not limited to the aforementioned measurement circuit 18 , the amplifier circuit 17 , the detection selection circuit 142 , and may even include the variable electrical group 16 . The circuits listed in this example are for the convenience of description of the present invention, and the detection circuit 42 may include only a part of the circuits or add more circuits, which is not limited by the present invention. In addition, the detection circuit 42 further includes executing the aforementioned steps 320 to 340 , and executing the step 350 or the step 360 . In the example of FIG. 3B , the frequency settings may not be stored sequentially according to the power consumption.

As previously described, the one-dimensional sensing information for determining whether the interference of the noise exceeds the allowable range is generated when the driving signal is not supplied to the driving electrode. For example, when the drive selection circuit 131 is turned off and the detection selection circuit 132 is turned on.

In an example of the present invention, at least the driving potential has multiple driving modes, and the driving modes include a single-electrode driving mode and a dual-electrode driving mode, wherein in the single-electrode driving mode, the driving signal only supplies the driving electrodes at the same time one, and in a two-electrode drive mode, the drive signal provides only one pair of the drive electrodes at a time. The power consumption of the single-electrode driving mode is smaller than that of the dual-electrode driving mode. In addition, in the single-electrode drive type, the detection circuit generates the one-dimensional sensing information when each drive electrode is supplied with a drive signal, so as to form a complete image, and in the two-electrode drive In the formula, the detection circuit generates the one-dimensional sensing information when each pair of driving electrodes is provided with a driving signal, so as to form an inset image, wherein the pixels of the inset image are smaller than the pixels of the complete image. pixel. In addition, in the dual-electrode driving mode, the detection circuit may further include driving the electrodes on both sides respectively, and when a single driving electrode on either side is driven, detect the signals of all the detection electrodes to generate the one-dimensional sensing respectively information, wherein two one-dimensional sensing information generated by driving the electrodes on both sides respectively are placed outside the two sides of the indented image to form an expanded image, and the pixels of the expanded image are larger than the complete image pixels.

In another example of the present invention, the driving potential includes a first driving potential and a second driving potential, wherein the single-electrode driving mode corresponding to the first driving potential consumes power to generate the complete image > The power consumption of the two-electrode driving mode corresponding to the first driving potential to generate the indented image > the power consumption of the single-electrode driving mode corresponding to the second driving potential to generate the complete image .

In another example of the present invention, the driving potential includes a first driving potential and a second driving potential, wherein the single-electrode driving mode corresponding to the first driving potential consumes power to generate the complete image > The power consumption for generating the complete image in the single-electrode driving mode corresponding to the second driving potential.

In addition, in the example of the present invention, the signal of each detection electrode is respectively supplied to the detection circuit through a variable resistor, and the detection circuit is set according to a parameter set of one of the frequency settings. to determine the impedance of the variable resistor. In addition, the signal of the detection electrode is detected after at least an amplification circuit amplifies the signal, and the detection circuit sets the gain of the amplification circuit according to a parameter group of one of the frequency settings. Furthermore, the driving signal is generated according to a parameter set of one of the frequency settings.

In the example of the present invention, each value of the one-dimensional sensing information is generated according to the signal of the detection electrode with a set period, wherein the set period is set according to the frequency. One parameter group to set. In another example of the present invention, each value of the one-dimensional sensing information is generated according to the signal of the detection electrode with at least a set phase, wherein the set phase is based on the One of the parameter groups of the frequency setting is set.

In addition, the aforementioned driving circuit 41 , detection circuit 42 and storage circuit 43 may be controlled by the control circuit 45 . The control circuit 45 may be a programmable processor or other control circuits, which is not limited in the present invention.

Please refer to FIG. 5 , which is a schematic diagram of a single-electrode driving mode according to the present invention. The driving signal S is sequentially supplied to the first driving electrode, the second driving electrode, . 52. The one-dimensional sensing information 52 of the single-electrode drive generated when each drive electrode is driven can be assembled to form a complete image 51, and each value of the complete image 51 corresponds to a change in capacitive coupling at one of the electrode intersections.

Furthermore, each value of the complete image corresponds to the position of one of the overlaps, respectively. For example, the center position of each driving electrode corresponds to the first one-dimensional coordinate, and the center of each detecting electrode corresponds to the second one-dimensional coordinate, respectively. The first one-dimensional coordinate can be one of a horizontal (or horizontal, X-axis) coordinate and a vertical (or vertical, Y-axis) coordinate, and the second one-dimensional coordinate can be a horizontal (or horizontal, X-axis) coordinate and a vertical coordinate The other of the (or vertical, Y-axis) coordinates. Each overlap corresponds to a two-dimensional coordinate of the driving electrode and the detection electrode overlapped at the overlap, and the two-dimensional coordinate is composed of the first one-dimensional coordinate and the second one-dimensional coordinate, such as (No. one 1-dimensional coordinate, second 1-dimensional coordinate) or (second 1-dimensional coordinate, first 1-dimensional coordinate). In other words, the one-dimensional sensing information of each single-electrode driving corresponds to the first one-dimensional coordinate of the center of one of the driving electrodes, wherein each value of the one-dimensional sensing information of the single-electrode driving (or the Each value) corresponds to a two-dimensional coordinate formed by the first one-dimensional coordinate of the center of one of the driving electrodes and the second one-dimensional coordinate of the center of one of the detection electrodes. Similarly, each value of the complete image corresponds to the central position of one of the overlapping positions, that is, corresponding to the first one-dimensional coordinate of the center of one of the driving electrodes and the center of one of the detection electrodes, respectively. The second one-dimensional coordinates of the two-dimensional coordinates formed by the.

Please refer to FIG. 6 , which is a schematic diagram of a two-electrode driving mode according to the present invention. The drive signal S is sequentially supplied to the first pair of drive electrodes, the second pair of drive electrodes, . measurement information 62. In other words, the N driving electrodes may constitute N-1 pairs (multiple pairs) of driving electrodes. The one-dimensional sensing information 62 of the two-electrode drive generated when each pair of drive electrodes is driven can be assembled to form an inset image 61 . The number of values (or pixels) of the inset image 61 is smaller than the number of values (or pixels) of the full image 51 . With respect to the complete image, the one-dimensional sensing information of each two-electrode drive of the indented image corresponds to the first one-dimensional coordinate of the central position between a pair of drive electrodes, and each value corresponds to the aforementioned pair of drive electrodes. The first one-dimensional coordinate of the central position of the detector electrode and the second one-dimensional coordinate of the center of one of the detection electrodes are two-dimensional coordinates. In other words, each value of the inset image corresponds to the position of the center between a pair of overlapping positions, that is, respectively corresponds to the first dimension of the center position between a pair of driving electrodes (or one of the pairs of driving electrodes). The two-dimensional coordinate formed by the coordinate and the second one-dimensional coordinate of the center of one of the detection electrodes.

Please refer to FIG. 7A , which is a schematic diagram of single-electrode driving on the first side in the dual-electrode driving mode according to the present invention. The drive signal S is provided to the drive electrode closest to the first side of the capacitive touch screen, and when the drive electrode closest to the first side of the capacitive touch screen is driven by the drive signal S, single-electrode driven first-side one-dimensional sensing information is generated 721. Please refer to FIG. 7B again, which is a schematic diagram of the second-side single-electrode driving in the dual-electrode driving mode according to the present invention. The drive signal S is provided to the drive electrode closest to the second side of the capacitive touch screen, and when the drive electrode closest to the second side of the capacitive touch screen is driven by the drive signal S, single-electrode driven second-side one-dimensional sensing information is generated 722. The single-electrode driven one-dimensional sensing information 721 and 722 generated when the driving electrodes on the first side and the second side are driven are respectively placed on the outside of the first side and the second side of the inner miniature image 61 to form the outer enlarged image 71 . The number of values (or pixels) of the expanded image 71 is greater than the number of values (or pixels) of the full image 51 . In an example of the present invention, the first-side one-dimensional sensing information 721 of single-electrode driving is firstly generated, then the inset image 61 is generated, and then the second-side one-dimensional sensing information 722 of single-electrode driving is generated to form An external expansion image 71. In another example of the present invention, the indented image 61 is first generated, and then the one-dimensional sensing information 721 and 722 of the first side and the second side driven by the single electrode are respectively generated to form an externally enlarged image 71 .

In other words, the expanded image is sequentially composed of the one-dimensional sensing information on the first side driven by the single electrode, the indented image, and the one-dimensional sensing information on the second side driven by the single electrode. Since the value of the inner miniature image 61 is driven by two electrodes, the average size is larger than the average size of the values of the one-dimensional images on the first side and the second side of the single electrode drive. In the example of the present invention, the values of the one-dimensional sensing information 721 and 722 of the first side and the second side are respectively placed outside the first side and the second side of the inset image 61 after being scaled up. The ratio may be a preset multiple, and the preset multiple is greater than 1, or may be generated according to a ratio between the value of the one-dimensional sensing information of the two-electrode driving and the value of the one-dimensional sensing information of the single-electrode driving. For example, it is the ratio of the sum (or average) of all values of the one-dimensional sensing information 721 on the first side to the sum (or average) of all values of the one-dimensional sensing information 62 adjacent to the first side in the inset image. The value of the dimension sensing information 721 is enlarged by this ratio before being placed outside the first side of the inset image 61 . Similarly, it is the ratio of the sum (or average) of all values of the one-dimensional sensing information 722 on the second side to the sum (or average) of all the values of the one-dimensional sensing information 62 adjacent to the second side in the inset image, and the second The value of the side one-dimensional sensing information 722 is enlarged by this ratio before being placed outside the second side of the inset image 61 . For another example, the aforementioned ratio may be the ratio of the sum (or average) of all values of the inset image 61 to the sum (or average) of all values of the one-dimensional sensing information 721 and 722 of the first side and the second side.

In the single-electrode drive mode, each value (or pixel) of the complete image corresponds to a two-dimensional position (or coordinate) at the overlap, which is the first one-dimensional position corresponding to the drive electrode overlapped at the overlap (or coordinates) is composed of the second one-dimensional position (or coordinates) corresponding to the detection electrode, such as (the first one-dimensional position, the second one-dimensional position) or (the second one-dimensional position, the first one-dimensional position) a one-dimensional location). A single external conductive object may be capacitively coupled to one or more overlaps, and the overlap with the capacitive coupling of the external conductive object will produce a change in capacitive coupling, which is reflected in the corresponding value in the complete image, that is, reflected in the external Conductive objects correspond to corresponding values in the full image. Therefore, the centroid position (two-dimensional coordinates) of the external conductive objects can be calculated according to the corresponding values and two-dimensional coordinates of the external conductive objects in the complete image.

According to an example of the present invention, in the single-electrode driving mode, the corresponding one-dimensional position of each electrode (the driving electrode and the detection electrode) is the position of the center of the electrode. According to another example of the present invention, in the two-electrode driving mode, the corresponding one-dimensional position of each pair of electrodes (driving electrodes and detection electrodes) is the central position between the two electrodes.

In the miniature image, the first one-dimensional sensing information corresponds to the central position of the first pair of driving electrodes, that is, the first one-dimensional in the center between the first and second driving electrodes (the first pair of driving electrodes). Location. If the position of the centroid is simply calculated, only the position between the center of the first pair of driving electrodes and the center of the last pair of driving electrodes can be calculated, and the range of positions calculated based on the endoscopic image lacks the central position of the first pair of driving electrodes (center The range between the first one-dimensional position of ) and the central position of the first driving electrode and the range between the central position of the last pair of driving electrodes and the central position of the last driving electrode.

Compared with the indented image, in the extended image, the one-dimensional sensing information of the first side and the second side respectively corresponds to the position of the center of the first and last driving electrodes, so the range ratio of the position calculated according to the extended image is The range of positions calculated according to the inset image is increased by the range between the central position of the first pair of driving electrodes (the first one-dimensional position in the center) and the central position of the first driving electrode, and the central position and the final position of the last pair of driving electrodes. The range between the central positions of a drive electrode. In other words, the range of the position calculated according to the expanded image includes the range of the position calculated according to the complete image.

Similarly, the aforementioned two-electrode driving mode can be expanded into a multi-electrode driving mode, that is, driving a plurality of driving electrodes at the same time. In other words, the driving signal is simultaneously provided to a plurality of (all) driving electrodes in a group of driving electrodes, for example, the number of driving electrodes in a group of driving electrodes is two, three or four. The multi-electrode driving mode includes the aforementioned two-electrode driving mode, but does not include the aforementioned single-electrode driving mode.

Please refer to FIG. 8 , which is a detection method for detecting a capacitive touch screen according to the present invention. As shown in step 810, a capacitive touch screen having a plurality of driving electrodes and a plurality of detecting electrodes arranged in parallel in sequence is provided, wherein the driving electrodes and the detecting electrodes overlap at a plurality of overlapping places. For example, the aforementioned drive electrodes 151 and detection electrodes 152 . Next, as shown in step 820, driving signals are provided to one of the driving electrodes and a group of driving electrodes in the single-electrode driving mode and the multi-electrode driving mode, respectively. That is, in the unipolar driving mode, the driving signal is supplied to only one of the driving electrodes at a time, and in the multi-electrode driving mode, the driving signal is supplied simultaneously to a group of driving electrodes of the driving electrodes at a time. , except for the last N driving electrodes, each driving electrode and the following two adjacent driving electrodes form a group of driving electrodes that are driven at the same time, and N is the number of driving electrodes in a group of driving electrodes minus one. The supply of the driving signal may be provided by the aforementioned driving circuit 41 . Next, as shown in step 830, each time the driving signal is provided, one-dimensional sensing information is obtained from the detection electrodes, so as to obtain one-dimensional sensing of multiple multi-electrode driving in the multi-electrode driving mode The information and the one-dimensional sensing information of the single-electrode drive on the first side and the second side are obtained in the single-electrode drive mode. For example, in the multi-electrode driving mode, the one-dimensional sensing information of the multi-electrode driving is obtained when each group of driving electrodes is provided with a driving signal. For another example, in the single-electrode driving mode, the one-dimensional sensing information of the first-side single-electrode driving and the one-dimensional sensing information of the second-side single-electrode driving are respectively obtained when the first driving electrode and the last driving electrode provide driving signals. measurement information. The one-dimensional sensing information can be obtained by the above-mentioned detection circuit 42 . The one-dimensional sensing information includes the one-dimensional sensing information (inset image) of the multi-electrode driving and the one-dimensional sensing information of the first-side and second-side single-electrode driving. Next, as shown in step 840, sequentially according to the one-dimensional sensing information of the first-side single-electrode driving, all the one-dimensional sensing information of the multi-electrode driving, and the one-dimensional sensing information of the second-side single-electrode driving Generate an image (extended image). Step 840 may be performed by the aforementioned control circuit.

As described above, the potential of the driving signal in the single-electrode driving mode and the potential of the driving signal in the multi-electrode driving mode are not necessarily the same, and may be the same or different. For example, the single-electrode driving is driven by a larger first AC potential, and the ratio of the first AC potential to the second AC potential is a predetermined ratio relative to the second AC potential of the multi-electrode driving. In addition, step 840 is to generate the image according to whether all the values of the one-dimensional sensing information of the first-side and second-side single-electrode driving are respectively multiplied by the same or different predetermined ratios. In addition, the frequency of the drive signal in the single-electrode drive mode is different from the frequency of the drive signal in the multi-electrode drive mode.

The number of driving electrodes in a group of driving electrodes may be two, three, or even more, which is not limited in the present invention. In a preferred mode of the present invention, the number of driving electrodes in a group of driving electrodes is two. When the number of driving electrodes in a group of driving electrodes is two, each driving electrode corresponds to the first dimensional coordinate respectively, and the one-dimensional sensing information driven by each multi (double) electrode corresponds to a pair of the driving electrodes respectively The first one-dimensional coordinate of the center between the driving electrodes, and the one-dimensional sensing information of the single-electrode driving on the first side and the second side respectively corresponds to the first one-dimensional coordinate of the first and last driving electrodes.

Similarly, when the number of driving electrodes in a group of driving electrodes is multiple (more than two), each driving electrode corresponds to the first-dimensional coordinate, and the one-dimensional sensing information of each multi-electrode driving corresponds to the The first one-dimensional coordinate of the center between the two driving electrodes that are farthest apart in a group of the driving electrodes, and the one-dimensional sensing information of the single-electrode driving on the first side and the second side respectively corresponds to the first one The first one-dimensional coordinate with the last drive electrode.

In addition, each detection electrode corresponds to a second one-dimensional coordinate, and each value of each one-dimensional sensing information corresponds to a second one-dimensional coordinate of one of the detection electrodes, respectively.

如图9A所示，并且驱动信号提供给第二条驱动导电条时，第一条侦测导电条收的信号与提供给驱动导电条前的信号会产生第二相位差

如图9B所示。Please refer to FIG. 9A and FIG. 9B , which are schematic diagrams of the capacitive coupling signals received by the detecting conductive strips through the driving conductive strips. Since the signal passes through some load circuits, such as through capacitive coupling, a phase difference occurs between the signal received by the detection busbar and the signal provided before the driving busbar. For example, when the driving signal is provided to the first driving conductive strip, the signal received by the first detection conductive strip and the signal before being provided to the driving conductive strip will produce a first phase difference

As shown in FIG. 9A, and when the driving signal is provided to the second driving conductive strip, the signal received by the first detection conductive strip and the signal before being provided to the driving conductive strip will produce a second phase difference

As shown in Figure 9B.

与第二相位差

会随着驱动信号通过的电阻电容电路(RCcircuit)不同而有所差异。当驱动信号的周期都相同时，不同的相位差表示信号延迟不同的时间被收到，如果忽视前述的相位差直接量测信号，会造成信号量测的开始相位不同而产生不同结果。例如，假设相位差为0时，而信号为弦波，并且振幅为A。当在相位为30度、90度、150度、210度、270度与330度量测信号时，会分别得到|1/2A|、|A|、|1/2A|、|-1/2A|、|-A|与|-1/2A|的信号。但是当相位差为150度时，开始量测的相位造成偏差，以致变成在相位为180度、240度、300度、360度、420度与480度量测信号时，会分别得到0、

0、

与

的信号。first phase difference

phase difference from the second

It will vary with the resistance-capacitance circuit (RCcircuit) through which the driving signal passes. When the periods of the driving signals are all the same, different phase differences indicate that the signals are received with different time delays. If the aforementioned phase differences are ignored and the signals are directly measured, the starting phases of the signal measurement will be different, resulting in different results. For example, suppose the signal is a sine wave with an amplitude of A when the phase difference is 0. When the phase is 30 degrees, 90 degrees, 150 degrees, 210 degrees, 270 degrees and 330 degrees, the measurement signal will get |1/2A|, |A|, |1/2A|, |-1/2A respectively |, |-A| and |-1/2A| signals. However, when the phase difference is 150 degrees, the phase at the beginning of the measurement causes a deviation, so that when the phase is 180 degrees, 240 degrees, 300 degrees, 360 degrees, 420 degrees and 480 degrees, the measurement signals will get 0, 0, 480 degrees respectively.

0.

and

signal of.

From the above example, it can be seen that the delay in the starting phase of the measurement caused by the aforementioned phase difference will make the measurement results of the signal completely different. Whether the driving signal is a sine wave or a square wave (such as PWM), there will be similar differences exist.

In addition, each time the driving signal is provided, it may be provided to a plurality of adjacent driving conductive strips, wherein the driving conductive strips are arranged in parallel in sequence. In the preferred example of the invention, it is provided to two adjacent driving conductive strips, so in one scan, n driving conductive strips are provided with driving signals n-1 times in total, and each time is provided to a group of driving conductive strips , for example, the first time is provided to the first and second driving conductive strips, the second time is provided to the second and third driving conductive strips, and so on. As mentioned earlier, each time a driving signal is provided, a set of driving conductive strips provided may be one, two or more, and the present invention does not limit the number of driving conductive strips provided each time a driving signal is provided. Each time the driving signal is provided, all the signals measured by the detection bus bars can be aggregated into one 1D sensing information, and all 1D sensing information in one scan can be aggregated to form a 2D sensing information, which can be regarded as image.

Accordingly, in the first embodiment of the best mode of the present invention, different phase differences are used for different conductive strips to delay the detection signal. For example, a plurality of phase differences are first determined, and when each group of driving conductive strips is provided with a driving signal, the signals are measured according to each phase difference, and the phase difference based on the largest measured signal is the closest one. The phase difference between the signal provided before the driving busbar and the signal received by the detection busbar is referred to as the closest phase difference in the following description. The measurement of the signal can be to select one of the detection conductive strips to measure according to each phase difference, or to select a plurality or all of the detection conductive strips to measure according to each aberration, and to measure according to a plurality of or all of the detection conductive strips. Detect the sum of the signals of the conductive strips to determine the closest phase difference. According to the above, the closest phase difference of each group of conductive strips can be determined. In other words, when each group of conductive strips is provided with the driving signal, all the detected conductive strips are delayed until the closest phase difference of the driving signal is provided. Take measurements.

In addition, it may not be necessary to measure the signal according to all aberrations, and may measure the signal according to one phase difference in sequence among the phase difference(s) until it is found that the measured signal increases and then decreases. Stop where the phase difference on which the largest of the measured signals is measured is the closest phase difference. In this way, an image with a large signal can be obtained.

In addition, it is also possible to first select a group of the driving conductive strips as the reference conductive strips, and the other conductive strips are called non-reference conductive strips, and first detect the closest phase difference of the reference conductive strips as the level phase difference, and then detect the phase difference of the non-reference driving conductive strip that is closest to the leveled phase difference, which is called the most leveled phase difference. For example, the signal measured according to the leveling phase difference of the reference conductive strip is used as the leveling signal, and the signal is measured for each phase difference of each group of non-reference driving conductive strips. The phase difference according to which the signal is close to the leveling is taken as the leveling phase difference of the driving bus bar to which the driving signal is supplied. In this way, the leveling phase difference of each group of driving conductive strips can be determined, and the measurement of the delayed signal can be obtained according to the leveling phase difference of each group of driving conductive strips, and a relatively level image can be obtained, that is, the signal in the image. The difference between them is small. In addition, the leveling signal may fall within a preset working range, and does not necessarily need to be an optimal or maximum signal.

In the foregoing description, each time the driving signal is provided, the same phase difference is used for all the detection conductive strips. Those skilled in the art can infer that each time the driving signal is provided, each time the driving signal is provided. A set of detection conductive strips adopts respective closest approach phase difference or levelling phase difference. In other words, each time the driving signal is provided, signal measurement is performed on each phase difference of each group of detection conductive strips, so as to determine the closest phase difference or the leveled phase difference.

In fact, in addition to using aberrations to delay measurement to obtain larger or more flat images, different magnifications, impedances, and measurement times can also be used to obtain flatter images.

Accordingly, the present invention proposes a signal measurement method for a touch screen, as shown in FIG. 10 . As shown in step 1010, a touch screen is provided. The touch screen includes a plurality of conductive strips composed of a plurality of parallel driving conductive strips and a plurality of parallel detection conductive strips. The driving conductive strips and the detection conductive strips Overlap in multiple overlapping regions. In addition, as shown in step 1020, the retardation phase difference of each or each group of driving conductive strips is determined. Afterwards, as shown in step 1030, driving signals are sequentially provided to one or a group of the driving conductive strips, and the driving conductive strips provided with the driving signals and the detection conductive strips generate mutual capacitive coupling. Next, as shown in step 1040, each time the driving signal is provided, the signal of each detection combination of the provided driving signal is delayed by a corresponding phase difference before being measured.

Accordingly, in the signal measuring device for the touch screen of the present invention, the aforementioned step 1030 may be implemented by the aforementioned driving circuit 41 . In addition, step 1040 may be implemented by the aforementioned detection circuit 42 .

In the example of the present invention, the retardation phase difference of each or each group of driving conductive strips is selected from a plurality of predetermined phase differences, such as selecting the aforementioned closest phase difference. Each group of conductive strips refers to a group of a plurality of conductive strips that are simultaneously provided with driving signals when the plurality of conductive strips are driven, for example, implemented by the driving selection circuit 141 of the aforementioned driving circuit 41 . For example, one or a group of the driving conductive strips are sequentially selected as the selected conductive strips, as implemented by the driving circuit 41 . Next, the retardation phase difference of the selected conductive strip is selected from a plurality of predetermined phase differences. Wherein, when the driving signal is provided to the selected conductive strip, the signal measured after delaying the delay phase difference is greater than the signal detected after delaying other predetermined phase differences. For example, it is implemented by the aforementioned detection circuit 42 , and the detected delay phase difference can be stored in the storage circuit 43 .

In addition, the aforementioned leveling phase difference may be selected. For example, one or a group of the driving conductive bars is selected as the reference conductive bar, and the other bars or other groups of conductive bars are selected as the non-reference conductive bars, as implemented by the driving circuit 41 . Then, the delay phase difference of the reference conductive strip is selected from a plurality of predetermined phase differences, wherein when the driving signal is provided to the reference conductive strip, the signal detected after delaying the delay phase difference is larger than the delay phase difference of other predetermined phase differences. detected signal. Wherein, the retardation phase difference of the reference conductive strip is the aforementioned leveling phase difference. Next, the signal detected after the delay phase difference of the reference conductive strip is used as the reference signal, and then one or a group of non-reference conductive strips of the non-reference conductive strips are sequentially selected as the selected conductive strip, and The delay phase difference of the selected conductive strip is selected from a plurality of predetermined phase differences, such as the above-mentioned most leveled phase difference, wherein when the driving signal is provided to the selected conductive strip, the delay phase difference is delayed and detected. The signal is closest to the reference signal compared to the signal detected after being delayed by other predetermined phase differences. The above can be implemented by the detection circuit 42 .

In an example of the present invention, when a driving signal is provided to a reference bus bar or a selected bus bar, the signal measured by a plurality of the detection bus bars is one of the detection bus bars. measured signal. In other words, the delay phase difference is selected according to the signal of the same detection conductive strip. In another example of the present invention, when a driving signal is provided to a reference bus bar or a selected bus bar, the signals measured by a plurality of the detection bus bars are measured by the detection bus bar. The sum of the signals measured by at least two detection conductive strips. In other words, the delay phase difference is selected according to the sum of the signals of the same plurality of detection conductive strips or all the detection conductive strips.

As mentioned above, each or each group of the driven conductive strips may have a corresponding retardation phase difference in the overlapped region overlapping each of the detection conductive strips. In the following description, each or each group of driving conductive strips and each or each group of detection conductive strips are respectively overlapped as the detection combination. In other words, the driving signal can be simultaneously provided to one or more driving conductive strips, and the signal can also be measured by one or more detecting conductive strips. When a signal is generated by measurement, one or more driving conductive strips to which the driving signal is provided and one or more detection conductive strips to be measured are called a detection combination. For example, when a single strip is driven or multiple strips are driven, one conductive strip is used to measure the signal value, or two conductive strips are used to measure the difference, or three conductive strips are used to measure a pair of difference. The difference is the difference between the signals of two adjacent conductive strips, and the double difference is the difference between the signals of the first two conductive strips and the difference between the signals of the two adjacent conductive strips. Difference.

Accordingly, in another example of the present invention, it is a signal measurement method of a touch screen, as shown in FIG. 11 . As shown in step 1110, a touch screen is provided, and the touch screen includes a plurality of conductive strips composed of a plurality of parallel driving conductive strips and a plurality of parallel detection conductive strips, the driving conductive strips and the detection conductive strips Overlap in multiple overlapping regions. In addition, as shown in step 1120, use each or each group of driving conductive strips and respectively overlap each or each group of detection conductive strips as a detection combination, and as shown in step 1130, determine each detection combination delay phase difference. Afterwards, as shown in step 1140, the driving signals are sequentially provided to one or a group of the driving conductive strips, and the driving conductive strips provided with the driving signals and the overlapping detection in the detection combination of the driving conductive strips provided with the driving signals The conductive strips create mutual capacitive coupling. Next, as shown in step 1150, each time the driving signal is provided, the signal of each detection combination of the provided driving signal is delayed by a corresponding phase difference before being measured.

Accordingly, in a signal measurement apparatus of the present invention, step 1140 may be implemented by the aforementioned driving circuit 41 , and step 1150 may be implemented by the aforementioned detection circuit 42 .

In the example of the present invention, step 1130 may include: sequentially selecting one of the detection combinations as the selected detection combination, which may be implemented by the aforementioned driving circuit 41; and selecting from a plurality of predetermined phase differences The delay phase difference of the selected detection combination is obtained, wherein when the driving signal is provided to the selected detection combination, the signal measured after delaying the delay phase difference is greater than the signal detected after delaying other predetermined phase differences, It can be implemented by the aforementioned detection circuit 42 .

In another example of the present invention, determining the delay phase difference of each detection combination can also be implemented as described below. Selecting one of the detection combinations as the reference detection combination, the other detection combinations as the non-reference detection combination, and selecting one of the non-reference detection combinations in sequence as the selected detection combination may be determined by The aforementioned driving circuit 41 is implemented. In addition, the delay phase difference of the reference detection combination is selected from a plurality of predetermined phase differences, wherein when the driving signal is provided to the reference detection combination, the signal detected after delaying the delay phase difference is greater than the delay of other predetermined phases The signal detected after the difference is used as the reference signal, and the signal detected after the delay phase difference is delayed by the reference detection combination as the reference signal. In addition, the delayed phase difference of the selected detection combination is selected from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected detection combination, the detected signal after delaying the delayed phase difference is compared with that of the selected detection combination. The detected signal is closest to the reference signal after being delayed by other predetermined phase differences. The above can be implemented by the aforementioned detection circuit 42 .

In the second embodiment of the present invention, the signal is measured by the control circuit, the signals of each group of the detection conductive strips are measured after passing through the variable resistance respectively, and the control circuit is determined according to each group of the driving conductive strips The impedance of the variable resistor. For example, a group of the driving conductive strips is selected as the reference conductive strips, and the other conductive strips are called non-reference conductive strips. First set a plurality of preset impedances, and detect the signal of one detection conductive strip, or detect the signals of multiple or all detection conductive strips when the reference conductive strip (may be one or more strips) is provided with the driving signal , as the leveling signal. In addition, the leveling signal may fall within a preset working range, and does not necessarily need to be an optimal or maximum signal. In other words, any preset impedance that can make the leveling signal fall within the preset working range can be used as the leveling impedance of the reference conductive strip. Next, when each group of non-reference conductive strips is provided with a driving signal value, adjust the variable resistance according to each preset impedance, and detect the signal of the detection conductive strip, or detect the plurality or all of the detection strips. The summation of the signals of the strips is measured to compare the preset impedance closest to the leveling signal as the leveling impedance relative to the set of non-reference strips to which the drive signal is provided. In this way, the leveling impedance of each group of driving conductive strips can be determined, and the impedance of the variable resistor can be adjusted according to the leveling impedance of each group of driving conductive strips (adjust the variable resistance to the leveling impedance), and a more leveled impedance can be obtained. image, that is, the difference between the signals in the image is very small.

In the foregoing description, each time the driving signal is provided, all the detection conductive strips use the same leveling impedance. Those skilled in the art can infer that each time the driving signal is provided, the same leveling impedance is used. Each group of detection conductive strips adopts its own leveling impedance. In other words, each time the driving signal is provided, the signal measurement is performed on each preset impedance of each set of detection conductive strips, so as to determine the predicted impedance that is closest to the leveling signal, and obtain the corresponding impedance accordingly. When each group of driving conductive strips is provided with a driving signal, the leveling impedance of each detection conductive strip is adjusted to adjust the impedance of the variable resistor electrically coupled to each detection conductive strip, respectively.

The aforementioned control circuit can be composed of not only electronic components, but also one or more ICs. In the example of the present invention, the variable resistor can be built in the IC, and the impedance of the variable resistor can be controlled by a programmable program (eg, firmware in the IC). For example, a variable resistor is composed of multiple resistors and is controlled by multiple switches, and the impedance of the variable resistor is adjusted by the on and off of different switches. Since variable resistors and programmable programs are well-known technologies , will not be described here. The variable resistor in the IC is suitable for touch panels with different characteristics in a way that programmable programming can be corrected through the firmware, which can effectively reduce costs and achieve the purpose of commercial mass production.

In the third embodiment of the present invention, the signal is measured by the control circuit, the signals of each group of detection conductive strips are measured by the measurement circuit (such as an integrator) respectively, and the control circuit is based on each group of The drive strip determines the magnification of the measurement circuit. For example, a group of the driving conductive strips is selected as the reference conductive strips, and the other conductive strips are called non-reference conductive strips. First set a plurality of preset magnifications, and detect the signal of one detection conductive strip when the reference conductive strip (may be one or more strips) is provided with the driving signal, or detect the signal of multiple or all detection conductive strips The sum of the signals is used as the levelling signal. In addition, the leveling signal may fall within a preset working range, and does not necessarily need to be an optimal or maximum signal. In other words, any preset magnification that can make the leveling signal fall within the preset working range can be used as the leveling magnification of the reference bus bar. Next, when each group of non-reference conductive strips is provided with a driving signal value, the measurement circuit is adjusted according to each preset magnification, and the signal of the detection conductive strip is detected, or the plurality or all of the conductive strips are detected. The summation of the signals of the detected conductive strips is used to compare the preset magnification closest to the leveling signal as the leveling magnification relative to the set of non-reference conductive strips to which the driving signal is provided. In this way, the leveling magnification of each group of driving conductive strips can be determined, and the magnification of the measuring circuit can be adjusted according to the leveling magnification of each group of driving conductive strips, and a more level image can be obtained, that is, the The difference between the signals is very small.

In the foregoing description, the same leveling magnification is used for all the detection conductive strips each time the driving signal is provided. Those skilled in the art can infer that the same leveling magnification is used each time the driving signal is provided. , each group of detection conductive strips adopts its own leveling magnification. In other words, each time the driving signal is provided, the signal is measured for each preset magnification of each group of detection conductive strips, so as to determine the predicted magnification that is closest to the leveling signal, and accordingly The leveling magnification of each detection conductive strip when each group of driving conductive strips is supplied with the driving signal is obtained respectively.

In the fourth embodiment of the present invention, the signal is measured by the control circuit, the signal of each group of detection conductive strips is measured by a measurement circuit (such as an integrator), and the control circuit is based on each group of The drive bus bar determines the measurement time of the measurement circuit. For example, a group of the driving conductive strips is selected as the reference conductive strips, and the other conductive strips are called non-reference conductive strips. First set a plurality of preset measurement times, and detect the signal of one detection conductive strip, or detect multiple or all detection conductive strips when the reference conductive strip (may be one or more strips) is provided with the driving signal The sum of the signals is used as the leveling signal. In addition, the leveling signal may fall within a preset working range, and does not necessarily need to be an optimal or maximum signal. In other words, any preset measurement time that can make the leveling signal fall within the preset working range can be used as the leveling measurement time of the reference conductive strip. Next, when each set of non-reference conductive strips is provided with a driving signal value, the measurement circuit is adjusted according to each preset measurement time, and the signal of the detection conductive strip is detected, or the plurality of or The summation of the signals of all the detected conductive strips is used to compare the preset measurement time closest to the leveling signal as the leveling measurement time relative to the set of non-reference conductive strips to which the driving signal is supplied. In this way, the leveling measurement time of each group of driving conductive strips can be determined, and the measurement time of the measuring circuit can be adjusted according to the leveling measurement time of each group of driving conductive strips, and a more level image can be obtained, that is, The difference between the signals in the image is very small.

In the foregoing description, each time the driving signal is provided, the same leveling measurement time is used for all the detection conductive strips. Those skilled in the art can infer that each time the driving signal is provided. , each group of detection conductive strips adopts its own leveling measurement time. In other words, each time the driving signal is provided, the signal measurement is performed for each preset measurement time of each group of detection conductive strips, so as to determine the predicted measurement time that is closest to the leveling signal, Accordingly, the leveling measurement time of each detection conductive strip is obtained when each group of driving conductive strips is supplied with the driving signal.

In the foregoing description, one or more of the first embodiment, the second embodiment, the third embodiment and the fourth embodiment may be selected for implementation, and the present invention is not limited thereto. In addition, when measuring the leveling signal, one or more detection conductive strips farthest from the measuring circuit may be selected for signal detection, so as to generate the leveling signal. For example, the leveling signal can be generated by the signal of the farthest detection busbar, or the leveling signal (difference) can be generated by the differential signal of the two most distant detection busbars, or the farthest detection busbar can be used to generate the leveling signal. The difference between the differential signals of the first two detection conductive strips and the last two detection conductive strips of the three detection conductive strips is used to generate a leveling signal (double difference). In other words, the leveling signal may be a signal value, a difference value or a double difference value, or may be other values generated according to the signals of one or more detection conductive strips.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. The technical personnel, within the scope of the technical solution of the present invention, can make some changes or modifications to equivalent examples of equivalent changes by using the technical content disclosed above, but any content that does not depart from the technical solution of the present invention, according to the Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solutions of the present invention.

Claims (8)

1. A touch processor, comprising:

determining the delay phase difference of each driving conductive strip or each group of driving conductive strips, wherein the touch screen comprises a plurality of conductive strips consisting of a plurality of driving conductive strips arranged in parallel and a plurality of detecting conductive strips arranged in parallel, and the driving conductive strips and the detecting conductive strips are overlapped in a plurality of overlapping areas;

sequentially providing a driving signal to one or a group of the driving conductive strips, wherein the driving conductive strips provided with the driving signal and the detecting conductive strips generate mutual capacitive coupling; and

delaying a delay phase difference of one or a group of driving conductive strips corresponding to the provided driving signal each time the driving signal is provided, and then detecting a conductive strip measurement signal from at least one of the detecting conductive strips, wherein determining the delay phase difference of each or a group of driving conductive strips comprises:

selecting one or a group of the driving conductive strips in sequence as a selected conductive strip; and

selecting a delay phase difference of the selected conductive strip from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected conductive strip, the signal measured after delaying the delay phase difference is larger than the signals detected after delaying other predetermined phase differences.

2. The touch processor of claim 1, wherein the signals measured by the plurality of detecting conductive strips when the driving signal is provided to the selected conductive strip are the sum of the signals measured by one of the detecting conductive strips.

3. The touch processor as claimed in claim 1, wherein when the driving signal is provided to the selected conductive strip, the signals measured by the plurality of detecting conductive strips are the sum of the signals measured by at least two detecting conductive strips of the detecting conductive strips.

4. A touch processor, comprising:

determining the delay phase difference of each driving conductive strip or each group of driving conductive strips, wherein the touch screen comprises a plurality of conductive strips consisting of a plurality of driving conductive strips arranged in parallel and a plurality of detecting conductive strips arranged in parallel, and the driving conductive strips and the detecting conductive strips are overlapped in a plurality of overlapping areas;

sequentially providing a driving signal to one or a group of the driving conductive strips, wherein the driving conductive strips provided with the driving signal and the detecting conductive strips generate mutual capacitive coupling; and

delaying a delay phase difference of one or a group of driving conductive strips corresponding to the provided driving signal each time the driving signal is provided, and then detecting a conductive strip measurement signal from at least one of the detecting conductive strips, wherein determining the delay phase difference of each or a group of driving conductive strips comprises:

selecting one or one group of the driving conductive strips as a reference conductive strip, and selecting other strips or other groups of the driving conductive strips as non-reference conductive strips;

selecting a delay phase difference of the reference conductive strip from a plurality of predetermined phase differences, wherein when the driving signal is provided for the reference conductive strip, the signal detected after delaying the delay phase difference is larger than the signal detected after delaying other predetermined phase differences;

the signal detected after the reference conductive strip delays the delay phase difference is used as a reference signal;

selecting one or a group of non-reference conductive strips of the non-reference conductive strips in sequence as selected conductive strips; and

and selecting the delay phase difference of the selected conductive strip from a plurality of predetermined phase differences, wherein when the driving signal is provided for the selected conductive strip, the signal detected after delaying the delay phase difference is closest to the reference signal compared with the signals detected after delaying other predetermined phase differences.

5. The touch processor as claimed in claim 4, wherein when the driving signal is provided to the reference conductive strip or the selected conductive strip, the signal measured by the plurality of detecting conductive strips is the signal measured by one of the detecting conductive strips.

6. The touch processor as claimed in claim 4, wherein when the driving signal is provided to the reference conductive strip or the selected conductive strip, the signals measured by the plurality of detecting conductive strips are the sum of the signals measured by at least two detecting conductive strips of the detecting conductive strips.

7. A touch processor, comprising:

each or each group of driving conductive strips and each or each group of detecting conductive strips are overlapped to form a detecting combination, wherein the touch screen comprises a plurality of conductive strips formed by a plurality of driving conductive strips arranged in parallel and a plurality of detecting conductive strips arranged in parallel, and the driving conductive strips and the detecting conductive strips are overlapped in a plurality of overlapping areas;

determining a delay phase difference of each detection combination;

sequentially providing driving signals to one or a group of the driving conductive strips, wherein the driving conductive strips provided with the driving signals in the detection combination provided with the driving signals and the overlapped detection conductive strips generate mutual capacitive coupling; and

each time the driving signal is provided, the signal of each detecting combination of the provided driving signals is measured after being delayed by the corresponding phase difference, wherein the determining the delay phase difference of each detecting combination comprises:

sequentially selecting one of the detection combinations as a selected detection combination; and

selecting a delayed phase difference of the selected detection combination from a plurality of predetermined phase differences, wherein the delayed measured signal is greater than the delayed detected signals when the driving signal is provided to the selected detection combination.

8. The touch processor of claim 7, wherein determining the delay phase difference for each detection combination comprises:

selecting one of the detection combinations as a reference detection combination, and the other detection combinations as non-reference detection combinations;

selecting a delayed phase difference of a reference detection combination from a plurality of predetermined phase differences, wherein when a driving signal is provided to the reference detection combination, a signal detected after delaying the delayed phase difference is larger than signals detected after delaying other predetermined phase differences;

a signal detected after the delay phase difference is delayed by a reference detection combination is used as a reference signal;

sequentially selecting one of the non-reference detection combinations as a selected detection combination; and

selecting a delayed phase difference of the selected detection combination from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected detection combination, the signal detected after delaying the delayed phase difference is closest to the reference signal compared to the signals detected after delaying other predetermined phase differences.

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