CN105654888B - A common electrode voltage compensation circuit and display device - Google Patents

Abstract

The present invention discloses the compensation circuit and display device of a kind of public electrode voltages, is related to field of display technology, for reducing the power consumption of display device.Feedback signal, the signal of the first reference voltage terminal and the signal of the second reference voltage terminal that control module in the compensation circuit of the public electrode voltages is used to hold based on the feedback signal generate control signal；It compensates multiple selecting module to be used to adjust the compensation multiple of the compensation circuit of public electrode voltages according to the signal of control signal and cut-in voltage end, and by the feedback signal transmission obtained from control module to output module；Output module generates thermal compensation signal and exports for the signal with input signal end based on the feedback signal.The compensation circuit of public electrode voltages provided by the invention is applied to display device.

Description

A common electrode voltage compensation circuit and display device

technical field

The present invention relates to the field of display technology, in particular to a compensation circuit for common electrode voltage and a display device.

Background technique

At present, with the development of display technology, the size of the display device is required to be larger and larger, and the resolution of the display device is also required to be higher and higher, which makes the load of the display device larger and larger, resulting in data lines, common electrodes, etc. The coupling capacitance will also increase. With the change of the high and low level of the data signal on the data line, the common electrode will have a coupling phenomenon, and the coupling degree of the common electrode will also change. The coupling degree of the common electrode is serious or the coupling degree is light. At the time of heavy transition, phenomena such as crosstalk and greening of the display device will occur, which will affect the display effect of the display device.

In order to improve the display effect of the display device, it is necessary to use the feedback voltage of the common electrode to compensate the common electrode voltage. FIG. 1 is a schematic diagram of the compensation circuit of the common electrode voltage in the prior art. As shown in FIG. 1, the inverting input of the amplifier A The terminal "+" is connected to the input signal terminal Vcomin, the non-inverting input terminal "-" is connected to the feedback signal terminal feedVcom, the feedback signal terminal feedVcom is connected to the compensated common electrode, and the output terminal Vcomout of the amplifier A passes the output compensation signal into The compensated common electrode, thereby compensating for the common electrode voltage. Because the compensation signal needs to be amplified by a fixed multiple when compensating the common electrode voltage, that is, the compensation multiple for compensating the common electrode voltage is constant. However, when the compensation signal is amplified, the interference will also be amplified, and the interference will increase the power consumption of the display device. When the coupling degree of the common electrode is heavy and the coupling degree of the common electrode is light, the common electrode voltage is fixedly compensated The multiple compensation increases the power consumption of the display device.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a common electrode voltage compensation circuit and a display device, which are used to reduce the power consumption of the display device.

In order to achieve the above object, the present invention provides the following technical solutions:

In one aspect, the present invention provides a common electrode voltage compensation circuit, including a control module, a compensation multiple selection module and an output module; wherein,

The control module is respectively connected with the feedback signal terminal, the first reference voltage terminal, the second reference voltage terminal and the compensation multiple selection module, and is used for according to the feedback signal of the feedback signal terminal, the signal of the first reference voltage terminal and the The signal of the second reference voltage terminal generates a control signal, and the control signal is used to control the compensation multiple selection module to adjust the compensation multiple of the compensation circuit of the common electrode voltage;

The compensation multiple selection module is respectively connected to the turn-on voltage terminal, the control module and the output module, and is used for adjusting the compensation multiple of the compensation circuit of the common electrode voltage according to the control signal and the signal of the turn-on voltage terminal , and transmit the feedback signal obtained from the control module to the output module;

The output module is respectively connected to the compensation multiple selection module and the input signal terminal, and is configured to generate and output a compensation signal according to the feedback signal and the signal of the input signal terminal.

In another aspect, the present invention provides a display device including the compensation circuit for the common electrode voltage described in the above technical solutions.

In the common electrode voltage compensation circuit and the display device provided by the present invention, the common electrode voltage compensation circuit includes a control module, a compensation multiplier adjustment module and an output module, which is the same as the common electrode voltage in the prior art that compensates the common electrode voltage with a fixed compensation multiplier. Compared with the electrode voltage compensation circuit, the control module in the common electrode voltage compensation circuit in the present invention generates a control signal according to the feedback signal of the feedback signal terminal, the signal of the first reference voltage terminal and the signal of the second reference voltage terminal, and the compensation multiple is selected. The module adjusts the compensation multiple of the compensation circuit of the common electrode voltage according to the control signal. Since the feedback signal can reflect the coupling degree of the common electrode, it can provide a larger compensation multiple when the coupling degree of the common electrode is heavier. When it is lighter, a smaller compensation factor is provided, thereby reducing the power consumption of the display device.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic diagram of a compensation circuit for common electrode voltage in the prior art;

2 is a schematic diagram of a compensation circuit for a common electrode voltage in Embodiment 1 of the present invention;

3 is a schematic diagram of a compensation circuit for a common electrode voltage in Embodiment 2 of the present invention;

FIG. 4 is a schematic diagram illustrating the relationship between the feedback signal and the upper and lower thresholds of the first comparator and the second comparator in Embodiment 2 of the present invention.

Detailed ways

In order to further illustrate the compensation circuit for the common electrode voltage and the display device provided by the embodiments of the present invention, the following detailed description is given with reference to the accompanying drawings.

Example 1

Referring to FIG. 2 , the compensation circuit for the common electrode voltage provided by the embodiment of the present invention includes a control module P1, a compensation multiple selection module P2 and an output module P3; wherein, the control module P1 is respectively connected with the feedback signal terminal feedVcom and the first reference voltage terminal U1 , The second reference voltage terminal U2 is connected to the compensation multiple selection module P2, and is used to generate a control signal according to the feedback signal of the feedback signal terminal feedVcom, the signal of the first reference voltage terminal U1 and the signal of the second reference voltage terminal U2. It is used to control the compensation multiple selection module P2 to adjust the compensation multiple of the compensation circuit of the common electrode voltage. It should be noted that the feedback signal terminal feedVcom is connected to the compensated common electrode, that is, the feedback signal of the feedback signal terminal feedVcom is determined by the Provided by the compensation common electrode; the compensation multiple selection module P2 is respectively connected to the turn-on voltage terminal AVDD, the control module P1 and the output module P3, and is used to adjust the compensation circuit of the compensation circuit of the common electrode voltage according to the control signal and the signal of the turn-on voltage terminal AVDD and transmits the feedback signal obtained from the control module P1 to the output module P3; the output module P3 is connected to the compensation multiple selection module P2 and the input signal terminal Vcomin respectively, and is used to generate compensation according to the feedback signal and the signal of the input signal terminal Vcomin signal, and output from the output terminal Vcomout of the output module P3.

The following describes the driving method of the above-mentioned compensation circuit for the common electrode voltage in combination with the structure of the compensation circuit for the common electrode voltage in the first embodiment:

In the first stage, the control module P1 accepts the feedback signal from the feedback signal terminal feedVcom, which is the signal given by the compensated common electrode. The control module P1 receives the feedback signal, the signal from the first reference voltage terminal U1 and the second reference voltage The signal from the terminal U2 generates a control signal and transmits the control signal to the compensation multiple selection module P2. The control signal is used to control the compensation multiple selection module P2 to adjust the compensation multiple of the compensation circuit of the common electrode voltage.

In the second stage, the compensation multiple selection module P2 receives the control signal, and adjusts the compensation multiple of the compensation circuit of the common electrode voltage according to the control signal and the signal of the turn-on voltage terminal AVDD, so that when the feedback signal indicates that the coupling degree of the common electrode is heavy, the adjustment The compensation multiplier is larger, and when the feedback signal indicates that the coupling degree of the common electrode is relatively light, the adjustment compensation multiplier is smaller.

In the third stage, the output module P3 receives the feedback signal and the signal of the input signal terminal Vcomin, generates and outputs the compensation signal according to the feedback signal and the signal of the input signal terminal Vcomin, and outputs the compensation signal to the compensated common electrode, so as to adjust the voltage of the common electrode. to compensate.

The compensation circuit for the common electrode voltage provided by the present invention includes a control module P1, a compensation multiple adjustment module and an output module P3. Compared with the compensation circuit for the common electrode voltage in the prior art that compensates the common electrode voltage with a fixed compensation multiple, this The control module P1 in the compensation circuit of the common electrode voltage in the invention generates a control signal according to the feedback signal of the feedback signal terminal feedVcom, the signal of the first reference voltage terminal U1 and the signal of the second reference voltage terminal U2, and the compensation multiple selection module P2 According to the control signal, adjust the compensation multiplier of the compensation circuit of the common electrode voltage. Since the feedback signal can reflect the coupling degree of the common electrode, when the coupling degree of the common electrode is relatively heavy, a larger compensation multiplier is provided. When light, a smaller compensation factor is provided, thereby reducing the power consumption of the display device.

Embodiment 2

Referring to FIG. 3 , the specific structures and connection relationships of the control module P1, the compensation multiple selection module P2 and the output module P3 in the compensation circuit for the common electrode voltage in the above-mentioned embodiment will be described below:

The control module P1 includes a first comparator OP1, a second comparator OP2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6; The inverting input terminal "-" of the comparator OP1 is respectively connected to the first terminal of the first resistor R1, the first terminal of the fifth resistor R5, and the second terminal of the first capacitor C1 in the compensation multiple selection module P2, and its non-inverting input The terminal "+" is respectively connected to the first terminal of the second resistor R2, the first terminal of the third resistor R3 and the first terminal of the fourth resistor R4, and its output terminals are respectively connected to the second terminal of the third resistor R3 and the compensation multiple selection. The control pole of the first switch tube M1 in the module P2; the inverting input terminal "-" of the second comparator OP2 is connected to the second terminal of the fifth resistor R5, and the non-inverting input terminal "+" of the second comparator OP2 is connected to the sixth resistor R6. The first end, the output end of which is respectively connected to the second end of the fourth resistor R4 and the control electrode of the second switch tube M2 in the compensation multiple selection module P2; the first end of the first resistor R1 is connected to the feedback signal end feedVcom; the second end The second end of the resistor R2 is connected to the first reference voltage end U1; the second end of the sixth resistor R6 is connected to the second reference voltage end U2.

The compensation multiple selection module P2 includes a first switch M1, a second switch M2, a third switch M3, a first capacitor C1, a first resistance group X1 and a second resistance group X2, and the first resistance group X1 and the second resistance group Each group X2 includes at least one resistor; wherein, the first pole of the first switch tube M1 is connected to the turn-on voltage terminal AVDD, the second pole of which is connected to the control pole of the third switch tube M3; the first pole of the second switch tube M2 is connected to the first pole of the first switch tube M2. The control pole of the three switch tube M3, the second pole of which is connected to the turn-on voltage terminal AVDD; the first pole of the third switch tube M3 is connected to the first end of the first capacitor C1 and the first end of the first resistor group X1 respectively, and the first pole of the third switch tube M3 The diode is connected to the first end of the second resistance group X2; the second end of the first resistance group X1 is respectively connected to the second end of the second resistance group X2 and the inverting input end "-" of the amplifier A in the output module P3; The second terminal of the second resistor group X2 is connected to the inverting input terminal "-" of the amplifier A in the output module P3; the second terminal of the first capacitor C1 is connected to the inverting input terminal "-" of the first comparator OP1 in the control module P1 -", the first end of the first resistor R1 and the first end of the fifth resistor R5.

The output module P3 includes an amplifier A and a seventh resistor R7; wherein, the inverting input terminal "-" of the amplifier A is respectively connected to the second terminal of the first resistance group X1 and the second terminal of the second resistance group X2 in the compensation multiple selection module P2. terminal and the first terminal of the seventh resistor R7, the non-inverting input terminal "+" is connected to the input signal terminal Vcomin, and the output terminal is connected to the second terminal of the seventh resistor R7.

It should be noted that each of the above-mentioned switches may be transistors. If the switches are transistors, the control pole is the gate, one of the first pole and the second pole is the source, and the other is the drain. Specifically, the first comparator OP1 and the second comparator OP2 may be hysteresis comparators, so as to improve the response speed of the comparators and avoid self-oscillation of the compensation circuit of the common electrode voltage. Amplifier A may specifically be a linear amplifier. The turn-on voltage terminal AVDD continues to output a fixed signal, and the fixed signal enables the third switch M3 to be turned on.

Combining with the structure of the compensation circuit for the common electrode voltage in the second embodiment, the first resistance group X1 and the second resistance group X2 each include a resistance (also marked by X1 and X2), and the voltage terminal AVDD is turned on to continuously output a high-level signal , the control signal required for the first switch M1, the second switch M2, and the turn-on is a low-level signal, and the control signal required for the third switch M3 to turn on is a high-level signal. For example, for the above-mentioned common electrode voltage The driving method of the compensation circuit is explained:

It should be noted here that the signal of the first reference voltage terminal U1 is connected to the non-inverting input terminal "+" of the first comparator OP1, according to the voltage of the signal of the first reference voltage terminal U1, the resistance value of the second resistor R2, The resistance of the third resistor R3 and the output capability of the first comparator OP1 can be calculated to obtain the upper threshold UIH+ and the lower threshold UIL+ of the first comparator OP1, wherein the upper threshold UIH+ is higher than the lower threshold UIL+; , the upper threshold UIH- and the lower threshold UIL- of the second comparator OP2 can also be obtained, wherein the upper threshold UIH- is higher than the lower threshold UIL-; in this embodiment, the lower threshold UIL+ of the first comparator OP1 is higher than The upper threshold UIH- of the second comparator OP2.

In the compensation stage, as shown in Figure 4, when the voltage of the feedback signal at the feedback signal terminal feedVcom is less than the lower threshold UIL+ of the first comparator OP1 and greater than the upper threshold UIH- of the second comparator OP2, and the coupling degree of the common electrode When it is light, both the first comparator OP1 and the second comparator OP2 output a high level, the first switch M1 and the second switch M2 are both turned off, and the third switch M3 is also turned off. The compensation multiple of the compensation circuit is R7/X1 (the ratio of the resistance value of the seventh resistor R7 to the resistance value of the first resistor group X1), and the compensation multiple is relatively small. When the feedback signal rises (ie, upward coupling), when the voltage of the feedback signal received by the inverting input terminal "-" of the first comparator OP1 is greater than the upper threshold UIH+ of the first comparator OP1, that is, the common electrode When the degree of coupling is heavy, the output state of the first comparator OP1 changes, the output state of the second comparator OP2 remains unchanged, the output terminal of the first comparator OP1 outputs a low-level signal, and the output of the second comparator OP2 The terminal outputs a high-level signal, the first switch M1 and the third switch M3 are both turned on, and the second switch M2 is turned off. At this time, the compensation multiple of the compensation circuit for the common electrode voltage is (R7*X1*X2)/( X1+X2) (the ratio of the resistance value of the seventh resistor R7 to the resistance values of the first resistance group X1 and the second resistance group X2 connected in parallel), the compensation multiple is relatively large. When the feedback signal drops (ie, downward coupling), when the voltage of the feedback signal received by the inverting input terminal "-" of the second comparator OP2 is less than the lower threshold UIL- of the second comparator OP2, that is, the common When the coupling degree of the electrodes is heavy, the output state of the first comparator OP1 changes, the output state of the second comparator OP2 keeps changing, the output terminal of the first comparator OP1 outputs a high-level signal, and the output of the second comparator OP2 The terminal outputs a low-level signal, the second switch M2 and the third switch M3 are both turned on, and the first switch M1 is turned off. At this time, the compensation multiple of the compensation circuit for the common electrode voltage is (R7*X1*X2)/( X1+X2) (the ratio of the resistance value of the seventh resistor R7 to the resistance values of the first resistance group X1 and the second resistance group X2 connected in parallel), the compensation multiple is relatively large.

Embodiment 3

An embodiment of the present invention provides a display device, and the display device includes the compensation circuit for the common electrode voltage in the above-mentioned embodiments. Specifically, the display device may be any product or component with display function, such as electronic paper, mobile phone, tablet computer, television, monitor, notebook computer, digital photo frame, navigator, and the like. The compensation circuit for the common electrode voltage in the display device has the same advantages as the compensation circuit for the common electrode voltage in the above-mentioned embodiments, and details are not described herein again.

Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments.

In the foregoing description of the embodiments, the particular features, structures, materials or characteristics may be combined in any suitable manner in any one or more of the embodiments or examples.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (8)

1. a compensation circuit for common electrode voltage, characterized in that, comprising a control module, a compensation multiple selection module and an output module; wherein, The control module is respectively connected with the feedback signal terminal, the first reference voltage terminal, the second reference voltage terminal and the compensation multiple selection module, and is used for according to the feedback signal of the feedback signal terminal, the signal of the first reference voltage terminal and the The signal of the second reference voltage terminal generates a control signal, and the control signal is used to control the compensation multiple selection module to adjust the compensation multiple of the compensation circuit of the common electrode voltage; The compensation multiple selection module is respectively connected to the turn-on voltage terminal, the control module and the output module, and is used for adjusting the compensation multiple of the compensation circuit of the common electrode voltage according to the control signal and the signal of the turn-on voltage terminal , and transmit the feedback signal obtained from the control module to the output module; The output module is respectively connected to the compensation multiple selection module and the input signal terminal, and is used for generating and outputting a compensation signal according to the feedback signal and the signal of the input signal terminal; The compensation multiple selection module includes a first switch tube, a second switch tube, a third switch tube, a first capacitor, a first resistance group and a second resistance group, the first resistance group and the second resistance group are both including at least one resistor; wherein, The control pole of the first switch tube is connected to the control module, the first pole of the first switch tube is connected to the turn-on voltage terminal, and the second pole of the first switch tube is connected to the control pole of the third switch tube; The control pole of the second switch tube is connected to the control module, the first pole of the second switch tube is connected to the control pole of the third switch tube, and the second pole of the switch tube is connected to the turn-on voltage terminal; The first pole of the third switch tube is respectively connected to the first end of the first capacitor and the first end of the first resistance group, and the second pole of the third switch is connected to the first end of the second resistance group; The second end of the first resistance group is respectively connected to the second end of the second resistance group and the output module; The second end of the second resistance group is connected to the output module; The second end of the first capacitor is connected to the control module. 2 . The compensation circuit for common electrode voltage according to claim 1 , wherein the control module comprises a first comparator, a second comparator, a first resistor, a second resistor, a third resistor and a fourth resistor. 3 . , the fifth resistor and the sixth resistor; where, The inverting input terminal of the first comparator is respectively connected to the first terminal of the first resistor, the first terminal of the fifth resistor, and the compensation multiple selection module, and the non-inverting input terminal of the first comparator is respectively connected to the first terminal of the first resistor. The output ends of the first end of the second resistor, the first end of the third resistor and the first end of the fourth resistor are respectively connected to the second end of the third resistor and the compensation multiple selection module; The inverting input end of the second comparator is connected to the second end of the fifth resistor, the non-inverting input end of the second comparator is connected to the first end of the sixth resistor, and the output ends of the second comparator are respectively connected to the first end of the fourth resistor. Two terminals and the compensation multiple selection module; The second end of the first resistor is connected to the feedback signal end; the second end of the second resistor is connected to the first reference voltage end; the second end of the sixth resistor is connected to the second reference voltage end. 3. The compensation circuit for common electrode voltage according to claim 2, wherein the output module comprises an amplifier and a seventh resistor; wherein, The inverting input terminal of the amplifier is respectively connected to the compensation multiple selection module and the first terminal of the seventh resistor, the non-inverting input terminal of the amplifier is connected to the input signal terminal, and the output terminal of the amplifier is connected to the first terminal of the seventh resistor. two ends. 4. The compensation circuit for common electrode voltage according to claim 3, characterized in that, The control module includes a first comparator, a second comparator, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; The compensation multiple selection module includes a first switch tube, a second switch tube, a third switch tube, a first capacitor, a first resistance group and a second resistance group, the first resistance group and the second resistance group are both include at least one resistor; the output module includes an amplifier and a seventh resistor; The second end of the first capacitor is respectively connected to the inverting input end of the first comparator, the first end of the first resistor and the first end of the fifth resistor, and the control electrode of the first switch tube is respectively connected to the output of the first comparator terminal and the second terminal of the third resistor, the control pole of the second switch tube is respectively connected to the output terminal of the second comparator and the second terminal of the fourth resistor, the second terminal of the first resistor group is respectively connected to the first terminal of the seventh resistor One end is connected to the inverting input end of the amplifier, and the second end of the second resistor group is respectively connected to the first end of the seventh resistor and the inverting input end of the amplifier. 5 . The compensation circuit for the common electrode voltage according to claim 2 , wherein the first comparator and the second comparator are both hysteresis comparators. 6 . 6 . The compensation circuit for the common electrode voltage according to claim 3 , wherein the amplifier is a linear amplifier. 7 . 7 . The compensation circuit for the common electrode voltage according to claim 2 , wherein the lower threshold of the first comparator is higher than the upper threshold of the second comparator. 8 . 8. A display device, characterized in that it comprises the compensation circuit for the common electrode voltage according to any one of claims 1-7.