KR101942849B1 - Electronic device having a touch sensor and driving method thereof - Google Patents

Abstract

The present invention relates to a touch screen including touch sensors; And a touch screen driving circuit for driving the touch screen, wherein the touch screen driving circuit includes first touch raw data obtained when the first touch of the touch screen is generated, and second touch raw data obtained after the position is shifted while the first touch is maintained, Wherein the noise filter for the touch source data is different from the noise filter for the touch original data.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electronic device having a touch sensor,

The present invention relates to an electronic device having a touch sensor and a driving method thereof.

Various electronic devices, such as household appliances and portable information devices, have been replaced by touch sensors in a button-type switch in accordance with the trend of weight reduction and slimness. Accordingly, an electronic device such as a display device or the like that has recently been introduced has a touch sensor (or a touch screen).

One of the touch sensors, the capacitive touch sensor, senses a change in mutual capacitance when a human finger or a conductive material touches or approaches, thereby recognizing presence or absence of touch and coordinates. At this time, in order to measure a change in mutual capacitance and determine information about a touch, it is necessary to set each sensor node of the touch screen, output a drive signal, sense change in mutual capacitance of the touch screen, .

The capacitance type senses the mutual capacitance converted by human finger or conductive material and classifies it into touch only when the peak level of the sensed signal is above the threshold value and submits the touch report to it. The capacitive method temporarily stores the calculation result of the touch recognition algorithm and the touch coordinate data in the buffer memory in order to submit the touch report after removing the noise and the like appearing in the area other than the actual touch point.

In the conventional capacitance method, the touch coordinates stored in the buffer memory are transmitted to the host system after a certain frame delay in order to remove noise or the like. However, in the conventional capacitance type, if a user does not hold a touch for a certain frame and performs a short (or quick) touch in a click manner, the touch is not recognized as a touch.

In order to solve the above problems, the present invention provides an electronic device having a touch sensor capable of recognizing a touch even when a short (or quick) touch is performed in a click manner, and a method of driving the electronic device.

The present invention provides a touch screen including touch sensors. And a touch screen driving circuit for driving the touch screen, wherein the touch screen driving circuit includes first touch raw data obtained when the first touch of the touch screen is generated, and second touch raw data obtained after the position is shifted while the first touch is maintained, Wherein the noise filter for the touch source data is different from the noise filter for the touch original data.

When the first touch source data is obtained in the Nth frame period, the touch screen driving circuit can output the touch report for the first touch raw data in the (N + 1) th frame period.

The touch screen drive circuit may perform noise filtering on the second touch source data by omitting noise filtering on the first touch source data.

The touch screen drive circuit can output a touch report for the first touch primitive data for J (J is an integer equal to or greater than 1) frame period.

The touch screen drive circuit can output the touch report for the first touch raw data for three frames.

The touch screen drive circuit outputs a touch report of the first touch source data after one frame, and then outputs another touch report of the past two frames later than the current touch position.

According to another aspect of the present invention, there is provided a touch sensing method for sensing a touch screen by applying a driving signal to a touch screen; Determining whether the touch sensor is the first touch source data obtained by the first touch or the second touch source data obtained after the position is moved in the state where the first touch is maintained; And outputting a touch report including an identification number and coordinate information for the touch source data, wherein the step of outputting the touch report comprises: differentiating the noise filtering for the first touch source data and the second touch source data A method of driving an electronic device having a touch sensor is provided.

The step of outputting the touch report may output the touch report for the first touch raw data in the (N + 1) th frame period when the first touch raw data is obtained in the Nth frame period.

The step of outputting the touch report may omit the noise filtering for the first touch source data and perform the noise filtering for the second touch source data.

The step of outputting the touch report may output the touch report for the first touch source data during a J (J is an integer of 1 or more) frame period.

The step of outputting the touch report may output the touch report for the first touch raw data for three frames.

The step of outputting the touch report may output the touch report of the past two frames later than the current touched position as the touch report for the first touch source data is outputted after one frame and then outputted for the second frame period.

The present invention provides an electronic device having a touch sensor capable of recognizing a touch even when a short (or quick) touch is performed in a click manner, and a driving method thereof.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an illustration of an electronic device having a touch sensor according to an embodiment of the present invention.
2 is an equivalent circuit diagram of the touch screen shown in Fig.
3 to 5 are views showing various combinations of a liquid crystal display panel and a touch screen.
Figs. 6 and 7 are diagrams for explaining ghost noise. Fig.
FIG. 8 is an example in which a quick touch is performed on a touch screen by a click method. FIG.
FIG. 9 is a flowchart illustrating a coordinate transmission method according to a quick touch of a touch screen. FIG.
Fig. 10 is an exemplary diagram showing the coordinate transfer method of Fig. 8 on the time axis; Fig.
11 is an example of touching a touch screen and performing dragging for a certain frame.
FIG. 12 is a flowchart illustrating a coordinate transmission method according to the present invention when a touch screen is touched and dragged during a predetermined frame. FIG.
Fig. 13 is an exemplary diagram showing the coordinate transfer method of Fig. 11 on the time axis; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an equivalent circuit diagram of the touch screen shown in FIG. 1, and FIGS. 3 to 5 are diagrams showing an example of an electronic device having a touch sensor according to an embodiment of the present invention. FIG. 6 and FIG. 7 are views for explaining ghost noise. FIG.

The electronic device having the touch sensor of the present invention is implemented as a television, a set-top box, a navigation device, a video player, a Blu-ray player, a personal computer (PC), a home theater and a mobile phone. An electronic device having a touch sensor of the present invention is implemented based on a display panel. The display panel may be a flat panel display panel such as a liquid crystal display panel, an organic light emitting display panel, an electrophoretic display panel, or a plasma display panel, but is not limited thereto. However, in the following description, a liquid crystal display panel will be described as an example for convenience of explanation.

The electronic device having the touch sensor includes a host system 50, a timing controller 20, a data driving circuit 12, a scan driving circuit 14, a liquid crystal display panel DIS, a touch screen TSP, (30, 40).

The host system 50 includes a system on chip (SoC) with a built-in scaler, which converts the digital video data RGB of the input image into a format suitable for display on the display panel DIS. The host system 50 transmits timing signals (Vsync, Hsync, DE, MCLK) to the timing controller 20 together with the digital video data. The host system 50 executes the application program associated with the coordinate information XY of the touch input position input from the touch coordinate detection unit 40. [

The timing controller 20 receives timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock MCLK from the host system 50, And controls the data driving circuit 12 and the scan driving circuit 14 on the basis thereof.

The timing controller 20 generates a scan timing control signal based on a scan timing control signal such as a gate start pulse (GST), a gate shift clock, and a gate output enable (GOE) (14). The timing controller 20 generates a timing control signal based on a data timing control signal such as a source sampling clock (SSC), a polarity control signal (POL), and a source output enable (SOE) (12).

The data driving circuit 12 converts the digital video data RGB input from the timing controller 20 into an analog positive / negative gamma compensation voltage to generate a data voltage. The data driving circuit 12 supplies the data voltage through the data lines D1 to Dm.

The scan driving circuit 14 sequentially generates gate pulses (or scan pulses) synchronized with the data voltage. The scan driver circuit 14 supplies gate pulses through the gate lines G1 to Gn.

The liquid crystal display panel DIS displays an image based on the gate pulse supplied from the scan driving circuit 14 and the data voltage supplied from the data driving circuit 12. [ The liquid crystal display panel DIS includes a liquid crystal layer formed between two substrates GLS1 and GLS2. The liquid crystal display panel DIS may be implemented in any known liquid crystal mode such as TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode.

The subpixels of the liquid crystal display panel DIS are defined by the data lines (D1 to Dm, m is a positive integer) and the gate lines (G1 to Gn, n are positive integers). One subpixel includes a TFT (Thin Film Transistor) formed at the intersections of the data line and the gate line, a pixel electrode for charging the data voltage, a storage capacitor Cst connected to the pixel electrode for maintaining the voltage of the liquid crystal cell ) And the like.

A black matrix, a color filter and the like are formed on the upper substrate GLS1 of the liquid crystal display panel DIS. The lower substrate GLS2 of the liquid crystal display panel DIS may be implemented with a color filter on TFT (COT) structure. In this case, the black matrix and the color filter can be formed on the lower substrate GLS2 of the liquid crystal display panel DIS. The common electrode to which the common voltage is supplied may be formed on the upper substrate GLS1 or the lower substrate GLS2 of the liquid crystal display panel DIS. Polarizing plates POL1 and POL2 are attached to the upper substrate GLS1 and the lower substrate GLS2 of the liquid crystal display panel DIS and an alignment film for setting the pretilt angle of the liquid crystal on the inner surface in contact with the liquid crystal is formed.

A column spacer for maintaining a cell gap of the liquid crystal cell is formed between the upper substrate GLS1 and the lower substrate GLS2 of the liquid crystal display panel DIS. A backlight unit is disposed below the bottom surface of the lower polarizer plate POL2 of the liquid crystal display panel DIS. The backlight unit is implemented as an edge type or direct type to provide light to the liquid crystal display panel (DIS).

The touch screen TSP includes Tx lines (Tx1 to Txj, j is a positive integer smaller than n), Rx lines Rx1 to Rxi, i, which intersect with Tx lines Tx1 to Txj, And ix j number of touch sensors Cts formed at intersections of the Tx lines Tx1 to Txj and the Rx lines Rx1 to Rxi. Each of the touch sensors Cts includes a capacitance in view of an equivalent circuit.

Capacitance can be divided into self capacitance and mutual capacitance. The self-capacitance is formed along a conductor wiring of a single layer formed in one direction. The mutual capacitance is formed between two orthogonal conductor wirings. In the embodiment, the mutual capacitance type touch screen is illustrated, but the present invention is not limited thereto.

The touch screen TSP may be disposed on the upper polarizer POL1 of the liquid crystal display panel DIS as shown in FIG. The touch screen TSP may be disposed between the upper polarizer POL1 and the upper substrate GLS1 of the liquid crystal display panel DIS as shown in FIG. The touch screen TSP may be embodied such that the pixel electrode PIX of the lower substrate GLS2 and the touch sensor Cts are positioned together so as to be embedded in the liquid crystal display panel DIS as shown in FIG.

The touch screen driving circuits 30 and 40 supply a driving signal to the touch sensors Cts to sense a voltage change of the touch sensor before and after the touch input, compare the voltage change with a predetermined touch threshold value, . The touch screen drive circuits 30 and 40 calculate the coordinates of the touch input position.

The touch sensing circuit 30 includes a Tx driving circuit 32, an Rx driving circuit 34, a Tx / Rx controller 38, and the like. The touch sensing circuit 30 applies a driving signal to the touch sensors Cts through the Tx lines Tx1 to Txj using the Tx driving circuit 32 and applies the driving signals to the Rx lines Rx1 to Rx, Rxi) and the Rx driving circuit 34 to output touch raw data. The driving signal may be formed in various forms such as a pulse, a sinusoidal wave, and a triangular wave. The touch sensing circuit 30 may be integrated into one ROIC (read-out integrated circuit).

The Tx driving circuit 32 selects a Tx channel to output a driving signal in response to a Tx setup signal from the Tx / Rx controller 38 and outputs a driving signal to the Tx lines Tx1 to Txj connected to the selected Tx channel . The Tx lines Tx1 to Txj are charged during the high potential interval of the driving signal to supply charges to the touch sensors Cts. The driving signal is supplied to the Tx lines Tx1 to Txj through the Rx lines Rx1 to Rxi so that the voltage of the touch sensors Cts can be accumulated in the capacitors of the integrator built in the Rx driving circuit 34. [ N (N is a positive integer equal to or more than) can be continuously supplied to each of them.

The Rx driving circuit 34 selects Rx lines to receive the voltage of the touch sensor in response to the Rx set-up signal from the Tx / Rx controller 38 and outputs the selected Rx lines Rx1 to Rxi in synchronization with the driving signal And receives and samples the output voltage of the touch sensor (Cts). Then, the Rx drive circuit 34 accumulates the sampled voltage in the capacitor of the integrator, converts the voltage of the capacitor to digital data using an analog-to-digital converter (ADC) And outputs the digital data as touch raw data.

The Tx / Rx controller 38 controls the Tx and Rx channel settings in response to the Tx setup signal and the Rx setup signal from the touch coordinate detector 40 and synchronizes the Tx driver 32 and the Rx driver 34.

The touch coordinate detection unit 40 includes a coordinate calculation unit 46, a buffer memory 45, and the like. The coordinate calculation unit 46 supplies the Tx setup signal and the Rx setup signal to the Tx / Rx controller 38 and supplies the ADC clock signal for operating the ADC of the Rx drive circuit 34 to the Rx drive circuit 34 . The coordinate calculation unit 46 analyzes the touch raw data supplied from the Rx driving circuit 34 by a preset touch recognition algorithm. The coordinate calculation unit 46 determines that the touch data obtained from the touch sensors Cts is greater than or equal to the touch threshold value among the touch raw data using the touch recognition algorithm. The coordinate calculation unit 46 assigns an identification number to each of the touch data equal to or larger than the touch threshold value, and calculates coordinates for each of the touch input positions. The touch coordinate detection unit 40 temporarily stores the calculation result of the touch recognition algorithm and the touch coordinate data in the buffer memory 45 for noise elimination or the like and then calculates a touch report including the identification number and the coordinate information XY And transmits it to the host system 50. The touch coordinate detection unit 40 may be implemented as an MCU (Micro Controller Unit).

Meanwhile, the electronic device having the conventional touch sensor temporarily stores the calculation result of the touch recognition algorithm and the touch coordinate data in the buffer memory in order to remove the noise or the like appearing in the area other than the actual touch position. Then,

6 to 7 are views for explaining problems of an electronic device having a conventional touch sensor.

As shown in FIG. 6A, when the user touches the touch screen TSP using the finger F or the like and maintains the touch state for a predetermined frame, the touch coordinate data is calculated and transmitted. At this time, the touch position is calculated and transmitted only in the N + 3 frame (N + 3 Frame) period even though it is sensed in the N frame period as shown in FIG. This is because the coordinate calculation unit stores the touch raw data received from the N frame (N frame) section to the N + 2 frame (N + 2 frame) in the buffer memory and removes the noise (random noise including impulse etc.) Noise filtering (performing N-frame noise filtering). Accordingly, the touch report for the touch primitive data in the N frame (N frame) period is transmitted to the host system after being delayed by about 3 frames according to the noise filtering process.

6 (b), when the user touches the touch screen TSP briefly (or rapidly) in a click manner using the finger F or the like and then touches the finger F or the like, Computed and not transmitted. This is because the frame period set for the touch sensing period is not satisfied for noise removal or the like. Accordingly, the electronic device having the conventional touch sensor compares the touch original data obtained for about three frames for noise removal or the like, so that the touch device must be maintained in the touch state for the period of time to detect the touch. That is, in the conventional electronic device having a touch sensor, a short touch occurring in the N frame (N frame) is not recognized as a touch because it is detected as noise.

Therefore, the present invention improves the problem that the user is not recognized as a touch when the user performs a short (or quick) touch with a click method without maintaining the touch for a certain frame as follows.

FIG. 8 is a diagram illustrating an example of a quick touch of a touch screen by a click method, FIG. 9 is an exemplary view illustrating a flowchart of a coordinate transfer method when a touch is performed by a touch method, And the transmission method is shown on the time axis.

Hereinafter, a description will be given with reference to Fig. 1 and Fig. 8 to Fig.

The user can quickly touch the touch screen (TSP) in a click manner and then turn the finger (F) or the like. In this case, the touch screen driving circuit performs a sensing operation for determining whether there is touch or an operation for calculating touch coordinates, as follows.

The touch screen driving circuits 30 and 40 perform a first touch sensing operation for determining whether or not the touch screen TSP is touched (S110). During the first touch sensing operation, the Tx driving circuit 32 The driving signal is applied to the Tx lines Tx1 to Txj and the Rx driving circuit 34 receives and samples the output voltage of the touch sensor Cts through the Rx lines Rx1 to Rxi.

If the user does not touch the touch screen TSP using the finger F or the like (S120, N), the first touch sensing operation is repeated until the touch of the user is made. If the user does not touch the touch screen TSP (S120, N), the capacitance of the touch sensors Cts does not change.

The user quickly touches the touch screen TSP in the N frame period in a click manner and then touches the finger F or the like at S120 and Y and the Rx driving circuit 34 drives the Rx lines Rx1 to Rxi And receives and samples the output voltage of the touch sensor Cts. The Rx drive circuit 34 accumulates the sampled voltage in the capacitor of the integrator and outputs the voltage of the capacitor as the touch source data. The coordinate calculation unit 46 receives the touch primitive data of the N frame (N frame) period from the Rx driving circuit 34 and stores it in the buffer memory 45. [

The coordinate calculation unit 46 calculates the touch report including the identification number and the coordinate information XY of the touch raw data stored in the buffer memory 45 during the (N + 1) frame period of the N + 1 frame, The touch screen driving circuits 30 and 40 sequentially transmit the touch screen TSP to the touch screen driving circuit 50 in order to determine whether the touch screen TSP is touched during the (N + 1) (S140). In the drawing, the touch coordinate calculation and transmission step (S130) and the second touch sensing step (S140) are performed at the same time. However, the touch coordinate calculation and transmission step (S130) may precede the second touch sensing step (S140), and may be performed in parallel with the process of performing the second touch sensing step (S140).

In the touch coordinate calculation and transmission step S130, the coordinate calculation unit 46 compares the touch source data of the N frames (N frames) stored in the buffer memory 45 during the N + 1 frame (N + 1 frame) Analyze based on algorithm. The coordinate calculator 46 assigns an identification number to each touch data of a touch threshold value or more among the touch source data of the N frame (N frame) period, and calculates coordinates for each touch input position.

On the other hand, the coordinate calculation unit 46 does not perform noise filtering (to be described later) for removing noise (random noise including impulse or the like) on the touch original data of the N frame (N frame) period. The fact that noise filtering is not performed means that the process of comparing the touch primitive data obtained in about 3 frames for noise removal or the like is omitted. That is, the touch source data of the N frame (N frame) period is temporarily stored only for the purpose of calculating the touch report without being continuously stored in the buffer memory 45.

The reason why the noise filtering is performed only for the touch primitive data obtained when the first touch is generated is that, in the case of the touch screen (TSP), the first touch by the user while maintaining the no touch state (the state where the user does not touch the touch screen) This is because when the touch occurs, no noise (random noise including impulse) is generated.

Based on the above experimental results, if the user touches the first touch in a short way (or quickly) using the finger F or the like, the coordinate calculation unit 46 performs noise filtering. In the above situation, when the noise filtering is performed, the touch raw data generated at this time is recognized as a touch even if the user touches the touch by a short (or quick) touch.

Accordingly, the present invention performs noise filtering only on the touch primitive data obtained in the first touch so that the user can recognize the touch even if the user does not hold the touch for a predetermined frame but performs the short (or quick) touch in the click method. Alternatively, the user may hold the touch state after the first touch using the finger F or the like, dragging (or describing by drawing) during a certain frame, but hereinafter referred to as dragging) The touch screen driving circuits 30 and 40 operate as follows.

1, 11, and 12, a description will be given of the case where the touch screen is touched and dragged for a predetermined frame to facilitate understanding of the explanation.

FIG. 11 is a diagram illustrating an example of touching a touch screen and performing dragging for a predetermined frame, FIG. 12 is an exemplary view showing a flowchart of a coordinate transfer method when a touch screen is touched and dragged for a predetermined frame, Fig. 3 is a diagram showing an example of a coordinate transfer method on a time axis.

The user can drag the finger F or the like from the A point A to the B point B during a certain frame while touching the touch screen TSP in the N frame period. In this case, the Rx driving circuit 34 receives the output voltage of the touch sensor Cts from the N frame (N frame) section to the N + 9 frame (N + 9 frame) section through the Rx lines Rx1 through Rxi And sampling. The Rx drive circuit 34 accumulates the sampled voltage in the capacitor of the integrator and outputs the voltage of the capacitor as the touch source data.

The coordinate calculation unit 46 receives the touch primitive data generated from the Rx driving circuit 34 to the N + 9 frame (N + 9 frame) period to the frame memory 45, . The coordinate calculation unit 46 includes the identification number and the coordinate information XY for the touch raw data stored in the buffer memory 45 during the period from the N frame (N frame) section to the N + 9 frame (N + 9 Frame) And transmits the touch report to the host system 50. At this time, the touch screen driving circuit calculates the touch coordinates from the sensing operation for determining whether there is touch from the N frame (N frame) section to the N + 9 frame (N + 9 frame) .

The touch screen driving circuits 30 and 40 perform a first touch sensing operation for determining whether or not the touch screen TSP is touched (S210). During the first touch sensing operation, the Tx driving circuit 32 The driving signal is applied to the Tx lines Tx1 to Txj and the Rx driving circuit 34 receives and samples the output voltage of the touch sensor Cts through the Rx lines Rx1 to Rxi.

If the user does not touch the touch screen TSP using the finger F or the like (S220, N), the first touch sensing operation is repeated until the touch of the user is made. If the user does not touch the touch screen TSP (S220, N), the capacitance of the touch sensors Cts does not change.

When the user touches the touch screen TSP for the first time (S220, Y) in the N frame period, the Rx driving circuit 34 controls the touch sensor Cts through the Rx lines Rx1 to Rxi. The output voltage is received and sampled. The Rx drive circuit 34 accumulates the sampled voltage in the capacitor of the integrator and outputs the voltage of the capacitor as the touch source data. The coordinate calculation unit 46 receives the touch primitive data generated in the N frame (N frame) period from the Rx driving circuit 34 and stores it in the first storage of the buffer memory 45.

The coordinate calculation unit 46 performs noise filtering on the touch source data of the N frames (N frames) stored in the buffer memory 45 during the (N + 1) frame period, The touch screen drive circuit 30 and 40 generate the touch report including the information XY and transmit it to the host system 50. S230 In parallel with this, A second touch sensing operation for determining whether or not the touch screen TSP is touched is performed (S240)

If the user does not drag the first touch on the touch screen TSP while the second touch sensing operation is being performed (or if the touch state is not maintained) (S250, N) The operation becomes the same as after the first touch sensing operation.

Alternatively, if the user drags (or maintains the touch state) while maintaining the first touch on the touch screen (TSP) while the second touch sensing operation is performed (S250, Y), the Rx driving circuit 34 ) Receives and samples the output voltage of the touch sensor (Cts) through the Rx lines (Rx1 to Rxi). The Rx drive circuit 34 accumulates the sampled voltage in the capacitor of the integrator and outputs the voltage of the capacitor as the touch source data. The coordinate calculation unit 46 receives the touch primitive data generated in the (N + 1) frame period from the Rx driving circuit 34 and stores it in the second storage of the buffer memory 45.

The coordinate calculation unit 46 calculates the touch report including the identification number and the coordinate information XY of the touch raw data of the N frame period stored in the first storage of the buffer memory 45, (50). The coordinate calculation unit 46 performs noise filtering on the touch source data of the (N + 1) -th frame period stored in the second storage of the buffer memory 45 (S260). , The touch screen driving circuits 30 and 40 perform a third touch sensing operation for determining whether or not the touch screen TSP is touched during the N + 2 frame (N + 2 frame) period (S270)

According to the above operation flow, if the user continues to dragging while maintaining the first touch on the touch screen TSP (or maintains the touch state continuously) while the third touch sensing operation is being performed, Since the subsequent operations are the same as those after the second touch sensing operation, a description thereof will be omitted.

As can be seen from the above description, when the first touch is made to the touch screen (TSP), the present invention performs noise filtering only on the touch raw data obtained at the first touch position. However, if dragging is performed such as moving the position while the first touch is maintained, noise filtering is performed on the touch primitive data obtained after the second touch position. Hereinafter, an output pattern for each frame will be described with an example of a certain section.

Since the touch generated in the N frame period is the first position 1 according to the first touch, the coordinate calculation unit 46 calculates the noise (impulse or the like) for the touch primitive data in the N frame (N frame) A random noise included). Accordingly, the coordinate calculation unit 46 calculates the coordinates of the touch source data of the N-th frame (N frame) in the third touch sensing period where the touch sensing for the (N + 2) Calculates a touch report including the coordinate information (XY), and transmits it to the host system (50). The coordinate calculation unit 46 calculates a touch report including the identification number and the coordinate information (XY) of the touch source data obtained by the previous touch sensing over a total of three frame periods, and transmits the touch report to the host system 50 .

The (N + 1) -th frame (N + 1 Frame) is the second position (2) in which the touch generated in the N + 1 frame And performs noise filtering for eliminating noise (random noise including impulse and the like) for the touch raw data of the interval. Accordingly, the coordinate calculation unit 46 calculates the touch source data of the (N + 1) frame (N + 1 frame) period in the fourth touch sensing period where the touch sensing for the (N + 3) And transmits the touch report including the identification information and the coordinate information XY to the host system 50. [ The coordinate calculator 46 calculates the noise for removing noise (random noise including impulse) on the touch primitive data from the (N + 1) frame period to the (N + 3) Perform filtering.

The (N + 2) -th frame (N + 2 Frame) is the third position (3) where the touch occurred during the N + 2 frame And performs noise filtering for eliminating noise (random noise including impulse and the like) for the touch raw data of the interval. Accordingly, the coordinate calculation unit 46 calculates the touch source data of the N + 2 frame (N + 2 Frame) period in the fifth touch sensing period where the touch sensing for the (N + 4) And transmits the touch report including the identification information and the coordinate information XY to the host system 50. [ The coordinate calculator 46 calculates the noise for removing noise (random noise including impulse) on the touch primitive data from the (N + 2) frame period to the (N + 4) Perform filtering.

According to the above description, the coordinate calculation unit 46 calculates the noise (impulse) of the touch source data in the (N + 9) frame period as well as the touch occurring in the (N + 3) And the like).

As can be seen from the above description, in the present invention, when the first touch is generated during the maintenance of the no-touch state, the touch raw data obtained at this time is temporarily stored in the buffer memory, and noise filtering is performed so that the touch report is immediately output. If the touch state is maintained after the first touch, the obtained touch raw data is stored in the buffer memory, noise filtering is performed, and a touch report is output.

On the other hand, when comparing the conventional technique of FIG. 7 with the present invention of FIG. 13, the touch report for the touch raw data obtained at the time of the first touch generation is output after three frames. On the other hand, in the present invention, the touch report for the touch raw data obtained in the first touch generation is outputted after one frame, and then the touch report for the same touch raw data is outputted about two frames. According to the present invention, as the touch report is output in such a manner as described above, a past touch report about two frames behind the currently touched position is output.

As described above, the present invention provides an electronic device having a touch sensor capable of recognizing a touch even when a short (or quick) touch is performed in a click manner, and a driving method thereof.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

50: Host system 20: Timing controller
12: Data driving circuit 14: Scan driving circuit
DIS: LCD display panel TSP: Touch screen
30, 40: touch screen driving circuit

Claims (12)

A touch screen including touch sensors; And
And a touch screen driving circuit for driving the touch screen,
The touch screen driving circuit
Wherein the first touch source data obtained when the first touch of the touch screen is generated and the noise filtering of the second touch source data obtained after the position is moved while the first touch is maintained are different from each other. / RTI > The method according to claim 1,
The touch screen driving circuit
And outputs the touch report for the first touch raw data in the (N + 1) th frame period when the first touch raw data is obtained in the Nth frame period. The method according to claim 1,
The touch screen driving circuit
The noise filtering for the first touch raw data is omitted
And performs noise filtering on the second touch source data. The method according to claim 1,
The touch screen driving circuit
And outputs a touch report for the first touch source data during J (J is an integer equal to or greater than 1) frame period. The method according to claim 1,
The touch screen driving circuit
And outputs a touch report for the first touch raw data during a three-frame period. The method according to claim 1,
The touch screen driving circuit
Wherein the touch report of the first touch source data is output after one frame and then outputted for two frame periods to output a past touch report which is two frames later than the current touched position. . A touch sensing step of applying a driving signal to the touch screen and sensing the touch screen;
Determining whether the touch sensor is the first touch source data obtained by the first touch or the second touch source data obtained after the position is moved in the state where the first touch is maintained; And
And outputting a touch report including an identification number and coordinate information for the touch raw data,
The step of outputting the touch report
Wherein the first touch source data and the second touch source data are different in noise filtering from the first touch source data and the second touch source data. 8. The method of claim 7,
The step of outputting the touch report
And when the first touch raw data is obtained in the Nth frame period, the touch report for the first touch raw data is output in the (N + 1) th frame period. 8. The method of claim 7,
The step of outputting the touch report
The noise filtering for the first touch raw data is omitted
And performing noise filtering on the second touch source data. 8. The method of claim 7,
The step of outputting the touch report
And outputs a touch report for the first touch source data during J (J is an integer equal to or greater than 1) frame period. 8. The method of claim 7,
The step of outputting the touch report
And the touch report for the first touch source data is output for a period of three frames. 8. The method of claim 7,
The step of outputting the touch report
Wherein the touch report of the first touch source data is output after one frame and then outputted for two frame periods to output a past touch report which is two frames later than the current touched position. .

Images