Voltage compensation circuit of display panel and compensation method thereof, display device

Abstract

Provided are a voltage compensation circuit of a display panel, a compensation method thereof, and a display device, and belong to the technical field of display. The voltage compensation circuit comprises a first control circuit, a compensation circuit, and a second control circuit. The first control circuit can control the on-off of a voltage feedback end coupled with a common electrode line of the display panel and an input end of the compensation circuit based on a display enable signal provided by a display enable end. The compensation circuit can compensate a signal received by the input end. The second control circuit can control the on-off of an output end of the compensation circuit and the common electrode line based on the display enable signal and a touch enable signal provided by a touch enable end, and control the on-off of a touch sensing line for providing a touch sensing signal and the common electrode line. In this way, the display enable signal and the touch enable signal can be flexibly controlled, so that the common voltage transmitted to the pixels in the display area can be reliably compensated, and the quality of the image displayed by the display panel can be ensured to be better.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a voltage compensation circuit of a display panel, a compensation method thereof and a display device. BACKGROUND

[0002] Liquid crystal display (LCD) devices are currently a popular type of display equipment, and have the advantages of low power consumption, high brightness, vivid colors, and large viewing angles.

[0003] In the related art, an LCD device generally includes an LCD panel, a plurality of pixels in the LCD panel, and a backlight source on one side of the LCD panel. Each pixel includes a pixel electrode, a common electrode, and liquid crystal molecules between the pixel electrode and the common electrode. The liquid crystal molecules can be deflected under the pressure difference between the pixel voltage received by the pixel electrode and the common voltage received by the common electrode, so that the light emitted by the backlight source transmits through the liquid crystal molecules, the pixel emits light, and the LCD panel reliably displays an image.

[0004] However, due to the influence of parasitic capacitance in the LCD panel, the common voltage received by the common electrode is prone to fluctuation, which causes the liquid crystal molecules to be unable to reliably deflect, thereby causing the image quality displayed by the LCD panel to be poor. SUMMARY

[0005] A voltage compensation circuit of a display panel, a compensation method thereof, and a display device are provided, which can solve the problem of poor image quality displayed by the LCD panel in the related art. The technical solution is as follows:

[0006] In one aspect, a voltage compensation circuit of a display panel is provided, the display panel including a plurality of pixels coupled with a plurality of common electrode lines and configured to receive common voltages and touch sensing signals transmitted from the plurality of common electrode lines; the voltage compensation circuit including a first control circuit, a compensation circuit, and a plurality of second control circuits.

[0007] The first control circuit is coupled with a display enable end and a voltage feedback end, and is configured to control the connection and disconnection between the voltage feedback end and an output end of the first control circuit based on a display enable signal provided by the display enable end; and the voltage feedback end is coupled with the plurality of common electrode lines and configured to receive common voltages transmitted from the plurality of common electrode lines to the plurality of pixels.

[0008] A first input terminal of the compensation circuit is coupled with an output terminal of the first control circuit, and a second input terminal of the compensation circuit is coupled with a reference power supply terminal. The compensation circuit is configured to compensate a common voltage received by the first input terminal based on a reference power supply signal provided by the reference power supply terminal, and transmit the compensated common voltage to an output terminal of the compensation circuit.

[0009] Each of the second control circuits is coupled with the output terminal of the compensation circuit, the display enable terminal, the touch enable terminal, and a touch sensing terminal configured to provide the touch sensing signal. Each of the second control circuits is configured to control the on-off of the output terminal of the compensation circuit and the output terminal of the second control circuit based on the display enable signal and the touch enable signal provided by the touch enable terminal, and control the on-off of the touch sensing terminal and the output terminal of the second control circuit. The output terminals of the plurality of second control circuits are coupled with the plurality of common electrode lines.

[0010] Optionally, the output terminals of the plurality of second control circuits are one-to-one coupled with the plurality of common electrode lines.

[0011] Optionally, the first control circuit is further coupled with the touch enable terminal and the output terminal of the compensation circuit. The first control circuit is further configured to control the on-off of the output terminal of the compensation circuit and the output terminal of the first control circuit based on the touch enable signal.

[0012] Optionally, the first control circuit comprises a first control sub-circuit and a second control sub-circuit.

[0013] The first control sub-circuit is coupled with the display enable terminal and the voltage feedback terminal. The first control sub-circuit is configured to control the on-off of the voltage feedback terminal and the output terminal of the first control sub-circuit based on the display enable signal.

[0014] The second control sub-circuit is coupled with the touch enable terminal and the output terminal of the compensation circuit. The second control sub-circuit is configured to control the on-off of the output terminal of the compensation circuit and the output terminal of the second control sub-circuit based on the touch enable signal.

[0015] The output terminal of the first control sub-circuit and the output terminal of the second control sub-circuit are both coupled with the first input terminal of the compensation circuit.

[0016] Optionally, the first control sub-circuit comprises a first switch, and the second control sub-circuit comprises a second switch.

[0017] The control end of the first switch is coupled with the display enable end, the input end of the first switch is coupled with the voltage feedback end, and the output end of the first switch is coupled with the first input end of the compensation circuit as the output end of the first control sub-circuit.

[0018] The control end of the second switch is coupled with the touch control enable end, the input end of the second switch is coupled with the output end of the compensation circuit, and the output end of the second switch is coupled with the first input end of the compensation circuit as the output end of the second control sub-circuit.

[0019] Optionally, at least one of the first switch and the second switch comprises a transmission gate switch tube, or a P-type transistor, or an N-type transistor.

[0020] Optionally, the second control circuit comprises a third control sub-circuit and a fourth control sub-circuit.

[0021] The third control sub-circuit is coupled with the display enable end and the output end of the compensation circuit respectively, and the third control sub-circuit is used for controlling the on-off of the output end of the compensation circuit and the output end of the third control sub-circuit based on the display enable signal.

[0022] The fourth control sub-circuit is coupled with the touch control enable end and the touch control sensing end respectively, and the fourth control sub-circuit is used for controlling the on-off of the touch control sensing end and the output end of the fourth control sub-circuit based on the touch control enable signal.

[0023] The output end of the third control sub-circuit and the output end of the fourth control sub-circuit are coupled with the common electrode line.

[0024] Optionally, the third control sub-circuit comprises a third switch, and the fourth control sub-circuit comprises a fourth switch.

[0025] The control end of the third switch is coupled with the display enable end, the input end of the third switch is coupled with the output end of the compensation circuit, and the output end of the third switch is coupled with the common electrode line as the output end of the third control sub-circuit.

[0026] The control end of the fourth switch is coupled with the touch control enable end, the input end of the fourth switch is coupled with the touch control sensing end, and the output end of the fourth switch is coupled with the common electrode line as the output end of the fourth control sub-circuit.

[0027] Optionally, at least one of the third switch and the fourth switch comprises a transmission gate switch tube, or a P-type transistor, or an N-type transistor.

[0028] Optionally, the voltage compensation circuit further comprises a voltage dividing circuit.

[0029] The voltage dividing circuit is coupled with the power supply voltage terminal, the pull-down power supply terminal and the reference power supply terminal respectively, and is configured to transmit, to the reference power supply terminal, a voltage dividing result of the power supply voltage signal provided by the power supply voltage terminal based on a pull-down power supply signal provided by the pull-down power supply terminal.

[0030] Optionally, the voltage dividing circuit comprises a plurality of voltage dividing resistors, and at least one of the voltage dividing resistors is a variable resistor.

[0031] Among the plurality of voltage dividing resistors, a part of the voltage dividing resistors are connected in series between the power supply voltage terminal and the reference power supply terminal, and another part of the voltage dividing resistors are connected in series between the pull-down power supply terminal and the reference power supply terminal.

[0032] Optionally, the voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor.

[0033] Among the plurality of voltage dividing resistors, the first voltage dividing resistor is connected in series between the power supply voltage terminal and the reference power supply terminal, the second voltage dividing resistor is connected in series between the pull-down power supply terminal and the reference power supply terminal, and the second voltage dividing resistor is a variable resistor.

[0034] Optionally, the compensation circuit comprises an operational amplifier, a first capacitor, a second capacitor, a first resistor and a second variable resistor.

[0035] The first resistor and the second capacitor are connected in series between the inverting input terminal of the operational amplifier and the output terminal of the first control circuit, the first capacitor and the second variable resistor are connected in parallel between the inverting input terminal of the operational amplifier and the output terminal of the operational amplifier, and the non-inverting input terminal of the operational amplifier is coupled with the reference power supply terminal.

[0036] In another aspect, a voltage compensation method for a display panel is provided, which is applied to the voltage compensation circuit as described in the above aspect; the method comprises:

[0037] In response to a display instruction, a display enable signal of a first potential is provided to the display enable end, and a touch enable signal of a second potential is provided to the touch enable end. The first control circuit controls the voltage feedback end to be conductive with the output end of the first control circuit based on the display enable signal of the first potential. The compensation circuit compensates the common voltage transmitted by the plurality of common electrode lines received by the voltage feedback end to the plurality of pixels in the display panel based on a reference power signal provided by the reference power supply end, and transmits the compensated common voltage to the output end of the compensation circuit. Each second control circuit controls the output end of the compensation circuit to be conductive with the output end of the second control circuit, and controls the touch sensing end for providing a touch sensing signal to be decoupled with the output end of the second control circuit based on the display enable signal of the first potential and the touch enable signal of the second potential. The compensated common voltage is transmitted to the plurality of pixels through the plurality of common electrode lines coupled with the output ends of the plurality of second control circuits.

[0038] In response to a touch instruction, a display enable signal of a second potential is provided to the display enable end, and a touch enable signal of a first potential is provided to the touch enable end. The first control circuit controls the voltage feedback end to be decoupled with the output end of the first control circuit based on the display enable signal of the second potential. Each second control circuit controls the output end of the compensation circuit to be decoupled with the output end of the second control circuit, and controls the touch sensing end to be conductive with the output end of the second control circuit based on the display enable signal of the second potential and the touch enable signal of the first potential. The touch sensing signal provided by the touch sensing end is transmitted to the plurality of pixels through the plurality of common electrode lines coupled with the output ends of the plurality of second control circuits.

[0039] Optionally, the first control circuit is further coupled with the touch enable end and the output end of the compensation circuit respectively. The method further comprises:

[0040] In response to the touch instruction, the first control circuit controls the output end of the compensation circuit to be conductive with the output end of the first control circuit based on the touch enable signal of the first potential. The compensation circuit compensates the common voltage transmitted by the output end of the compensation circuit based on the reference power signal.

[0041] In yet another aspect, a display device is provided, which includes a display panel and a voltage compensation circuit as described in any of the above aspects. The display panel includes a plurality of pixels.

[0042] The voltage compensation circuit is coupled with the plurality of pixels through a plurality of common electrode lines, and is configured to compensate a common voltage transmitted to the plurality of pixels by the plurality of common electrode lines, and transmit a touch sensing signal to the plurality of pixels through the plurality of common electrode lines.

[0043] In summary, the technical solutions provided by the embodiments of the present disclosure can bring at least the following beneficial effects:

[0044] Provided are a voltage compensation circuit of a display panel, a compensation method thereof, and a display device. The voltage compensation circuit includes a first control circuit, a compensation circuit, and a second control circuit. The first control circuit can control the on-off of a voltage feedback end coupled with a common electrode line of the display panel and an input end of the compensation circuit based on a display enable signal provided by a display enable end. The compensation circuit can compensate a signal received by the input end. The second control circuit can control the on-off of an output end of the compensation circuit and the common electrode line based on the display enable signal and a touch enable signal provided by a touch enable end, and control the on-off of a touch sensing line for providing a touch sensing signal and the common electrode line. In this way, the display enable signal and the touch enable signal can be flexibly controlled, so that the common voltage transmitted to the pixels can be reliably compensated in the display area, and the quality of the image displayed by the display panel can be ensured to be better. BRIEF DESCRIPTION OF DRAWINGS

[0045] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0046] Figure 1 is a structural schematic diagram of a display panel provided by an embodiment of the present disclosure;

[0047] Figure 2 is a schematic diagram of signals on a common electrode line in a display area and a touch area provided by an embodiment of the present disclosure;

[0048] Figure 3 is a structural schematic diagram of a voltage compensation circuit provided by an embodiment of the present disclosure;

[0049] Figure 4 is a structural schematic diagram of another voltage compensation circuit provided by an embodiment of the present disclosure;

[0050] Figure 5 is a structural schematic diagram of still another voltage compensation circuit provided by an embodiment of the present disclosure;

[0051] Figure 6FIG. 1 is a structural schematic diagram of a voltage compensation circuit according to an embodiment of the present disclosure;

[0052] Figure 7 FIG. 2 is a structural schematic diagram of a voltage compensation circuit according to an embodiment of the present disclosure;

[0053] Figure 8 FIG. 3 is a structural schematic diagram of a voltage compensation circuit according to an embodiment of the present disclosure;

[0054] Figure 9 FIG. 4 is a structural schematic diagram of a first control circuit according to an embodiment of the present disclosure;

[0055] Figure 10 FIG. 5 is a structural schematic diagram of a second control circuit according to an embodiment of the present disclosure;

[0056] Figure 11 FIG. 6 is a flowchart of a voltage compensation method of a display panel according to an embodiment of the present disclosure;

[0057] Figure 12 FIG. 7 is a schematic diagram of signals of a voltage compensation circuit in a display area and a touch area according to an embodiment of the present disclosure;

[0058] Figure 13 FIG. 8 is a structural schematic diagram of a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below with reference to the drawings.

[0060] Figure 1 FIG. 1 is a structural schematic diagram of a voltage compensation circuit according to an embodiment of the present disclosure. As shown in FIG. 1, the display panel 10 includes a plurality of pixels P1. The plurality of pixels P1 are coupled (i.e., electrically connected) with a plurality of common electrode lines L1. The plurality of pixels P1 are configured to receive common voltage and touch sensing signal (TSS) transmitted from the plurality of common electrode lines L1. That is, the common voltage and the touch sensing signal are generally transmitted to the pixels P1 through the same plurality of common electrode lines L1. Figure 1 For example, referring to FIG. 2, the display panel shown therein includes a plurality of pixels P1 arranged in an array, i.e., the plurality of pixels P1 are arranged in a row and column manner. And, the plurality of pixels P1 arranged in the array shown therein are coupled with the plurality of common electrode lines L1 one by one in a row unit. That is, one row of pixels P1 is coupled with one common electrode line L1, and different rows of pixels P1 are coupled with different common electrode lines L1.

[0061] Figure 1 For example, referring to FIG. 2, the display panel shown therein includes a plurality of pixels P1 arranged in an array, i.e., the plurality of pixels P1 are arranged in a row and column manner. And, the plurality of pixels P1 arranged in the array shown therein are coupled with the plurality of common electrode lines L1 one by one in a row unit. That is, one row of pixels P1 is coupled with one common electrode line L1, and different rows of pixels P1 are coupled with different common electrode lines L1. ​

[0062] The common voltage can be used for the pixel P1 to emit light; the touch sensing signal can be used for the display panel to realize a touch sensing function and determine a position of the display panel being touched. Correspondingly, it is known that the display panel disclosed in the embodiments of the present disclosure can be a touch and display driver integration (TDDI) display panel. In a TDDI system, a display region and a touch region are generally time-divisionally divided, and the signal types transmitted to the pixel P1 through the common electrode line L1 are different between the display region and the touch region. For example, referring to Figure 2 In the touch region, the signal transmitted to the plurality of pixels P1 is generally a pulse type touch sensing signal TSS1; and in the display region, the signal transmitted to the plurality of pixels P1 is a non-pulse type common voltage. That is, the non-pulse type signal and the pulse type signal coexist on the common electrode line L1 in the display panel.

[0063] At present, on the one hand, as disclosed in the background, the image quality displayed by the display panel is poor due to the common voltage fluctuation; on the other hand, some embodiments also propose a voltage compensation circuit to compensate the common voltage, but the current voltage compensation circuit does not distinguish between the display region and the touch region, that is, the signal on the common electrode line L1 in the display region and the touch region is compensated. Since the touch sensing signal is an alternating signal of the pulse type, the voltage compensation circuit will work abnormally, which will cause problems in the operation of the TDDI system. Based on this, the embodiments of the present disclosure provide a voltage compensation circuit which can distinguish between the display region and the touch region. In the display region, the voltage compensation circuit can reliably compensate the common voltage on the common electrode line L1, and in the touch region, the voltage compensation circuit can not compensate the common voltage on the common electrode line L1. In this way, not only the system working reliability of the TDDI can be ensured, but also the image quality displayed by the display panel can be ensured to be good.

[0064] Figure 3 is a structural schematic diagram of a voltage compensation circuit provided by the embodiments of the present disclosure. As shown in Figure 3 The voltage compensation circuit includes a first control circuit 01, a compensation circuit 02 and a plurality of second control circuits 03.

[0065] The first control circuit 01 is coupled with a display enable end Display_en and a voltage feedback end VCOM_FBI respectively. The first control circuit 01 is used to control the on-off of the voltage feedback end VCOM_FBI and the output end of the first control circuit 01 based on the display enable signal provided by the display enable end Display_en. And in combination withFigure 1 The voltage feedback end VCOM FBI is coupled with the plurality of common electrode lines L1 and is configured to receive a common voltage transmitted by the plurality of common electrode lines L1 to the plurality of pixels P1.

[0066] For example, in the embodiment of the present disclosure, for the TDDI display panel, in the display area, the display enable end Display en can provide a first potential display enable signal, and the first control circuit 01 can control the voltage feedback end VCOM FBI to be conductive with the output end of the first control circuit 01 based on the first potential display enable signal. Further, the voltage feedback end VCOM FBI can transmit the common voltage collected from the display panel to the output end of the first control circuit 01. The common voltage transmitted to the output end of the first control circuit 01 is denoted as VCOM FBO. Of course, it can also be understood that VCOM FBI is the voltage feedback input end of the first control circuit 01, and VCOM FBO is the voltage feedback output end of the first control circuit 01. In the touch area, the display enable end Display en can provide a second potential display enable signal, and the first control circuit 01 can control the voltage feedback end VCOM FBI to be decoupled with the output end of the first control circuit 01 based on the second potential display enable signal.

[0067] Optionally, in the embodiment of the present disclosure, the first potential can be an effective potential, and the second potential can be an ineffective potential. It should be noted that the effective potential and the ineffective potential herein only represent that the potential of the signal has two state quantities, and do not represent that the effective potential or the ineffective potential has a specific value throughout the text. Moreover, the first potential (i.e., the effective potential) can be a high potential relative to the second potential (i.e., the ineffective potential). Of course, in some other embodiments, the first potential relative to the second potential can be a low potential.

[0068] Continuing to refer to Figure 3 It can be seen that the first input end of the compensation circuit 02 is coupled with the output end of the first control circuit 01, and the second input end of the compensation circuit 02 is coupled with the reference power supply end Vref. The compensation circuit 02 is configured to compensate the common voltage received by the first input end of the compensation circuit 02 based on the reference power signal provided by the reference power supply end Vref, and transmit the compensated common voltage to the output end of the compensation circuit 02.

[0069] Optionally, the reference power signal provided by the reference power terminal Vref can be determined in advance based on the common voltage required for reliably driving the pixel P1 to emit light. Correspondingly, when the signal received at the first input terminal of the compensation circuit 02 is the common voltage as described in the above embodiment, if it is determined that the common voltage is less than the reference power signal, the compensation circuit 02 can compensate the common voltage to be greater than or equal to the reference power signal, so as to ensure that the subsequent pixel P1 can reliably emit light based on the compensated common voltage. The common voltage output from the output terminal of the compensation circuit 02 is denoted as VCOM in the figure.

[0070] Continuing to combine Figure 1 and Figure 3 It can be seen that each second control circuit 03 is coupled with the output terminal of the compensation circuit 02, the display enable terminal Display_en, the touch enable terminal Touch_en, and the touch sensing terminal TSS for providing a touch sensing signal. Each second control circuit 03 is configured to control the on-off of the output terminal of the compensation circuit 02 and the output terminal of the second control circuit 03, and control the on-off of the touch sensing terminal TSS and the output terminal of the second control circuit 03, based on the display enable signal and the touch enable signal provided by the touch enable terminal Touch_en. The output terminals of the plurality of second control circuits 03 are coupled with the plurality of common electrode lines L1.

[0071] For example, in the embodiment of the present disclosure, for a TDDI display panel, as described in the above embodiment, the display enable terminal Display_en can provide a display enable signal of a first potential in the display area. In addition, the touch enable terminal Touch_en can provide a touch enable signal of a second potential. The second control circuit 03 can control the output terminal of the compensation circuit 02 and the output terminal of the second control circuit 03 to be conductive based on the display enable signal of the first potential. The second control circuit 03 can control the touch sensing terminal TSS and the output terminal of the second control circuit 03 to be decoupled based on the touch enable signal of the second potential. Further, on the basis that the first control circuit 01 controls the voltage feedback terminal VCOM_FBI and the output terminal of the first control circuit 01 to be conductive, so that the compensation circuit 02 compensates the common voltage VCOM_FBO fed back by the voltage feedback terminal VCOM_FBI (i.e., received at the first input terminal), the compensated common voltage VCOM can be further transmitted to the coupled common electrode line L1 through the output terminal of the second control circuit 03. Correspondingly, the pixel P1 can receive the compensated common voltage from the common electrode line L1 and reliably emit light in the display area.

[0072] In the touch region, the display enable terminal Display_en can provide a display enable signal of the second potential. In addition, the touch enable terminal Touch_en can provide a touch enable signal of the first potential. The second control circuit 03 can control the output terminal of the compensation circuit 02 to be decoupled from the output terminal of the second control circuit 03 based on the display enable signal of the second potential. The second control circuit 03 can control the touch sensing terminal TSS to be conductive to the output terminal of the second control circuit 03 based on the touch enable signal of the first potential. Further, the touch sensing signal provided by the touch sensing terminal TSS can be further transmitted to the coupled common electrode line L1 through the output terminal of the second control circuit 03. Accordingly, the pixel P1 can receive the touch sensing signal from the common electrode line L1, and the display panel can perform reliable touch sensing.

[0073] In the display region, the terminal TRXO transmits a signal of the compensated common voltage to the common electrode line L1. In the touch region, the terminal TRXO transmits a touch sensing signal to the common electrode line L1.

[0074] As described above, the display panel voltage compensation circuit provided by the embodiments of the present disclosure can not only compensate the common voltage, but also distinguish the display region and the touch region, and perform the compensation operation only in the display region. In this way, the quality of the image displayed by the display panel can be ensured to be better, and the working reliability of the TDDI system can be ensured.

[0075] In summary, the display panel voltage compensation circuit provided by the embodiments of the present disclosure includes a first control circuit, a compensation circuit, and a second control circuit. The first control circuit can control the on-off of the voltage feedback terminal coupled to the common electrode line of the display panel and the input terminal of the compensation circuit based on the display enable signal provided by the display enable terminal. The compensation circuit can compensate the signal received by the input terminal. The second control circuit can control the on-off of the output terminal of the compensation circuit and the common electrode line based on the display enable signal and the touch enable signal provided by the touch enable terminal, and control the on-off of the touch sensing line for providing the touch sensing signal and the common electrode line. In this way, the display enable signal and the touch enable signal can be flexibly controlled based on the display and touch scenarios, so that the common voltage transmitted by the common electrode line to the pixel in the display region can be reliably compensated, and the quality of the image displayed by the display panel can be ensured to be better.

[0076] Optionally, in combination with Figure 1 and Figure 3In the embodiment of the present disclosure, the output end of the plurality of second control circuits 03 can be coupled with the plurality of common electrode lines L1 one by one. That is, the voltage compensation circuit can include a plurality of second control circuits 03 which are the same in number as the plurality of electrode lines L1. The output end of each second control circuit 03 can be coupled with one common electrode line L1, and the output end of different second control circuits 03 can be coupled with different common electrode lines L1. In this way, in combination with Figure 1 On the basis that the output end of the plurality of common electrode lines L1 is coupled with the plurality of rows of pixels P1 one by one, it can be ensured that the touch sensing signal is transmitted to the plurality of rows of pixels P1 one by one through the plurality of common electrode lines L1, reliable touch sensing of the corresponding regions of each row of pixels P1 is achieved, and the accuracy of touch sensing can be improved.

[0077] Optionally, Figure 4 is a structural schematic diagram of another voltage compensation circuit provided by the embodiment of the present disclosure. As Figure 4 shown, the first control circuit 01 included in the voltage compensation circuit can also be coupled with the touch enable end Touch_en and the output end of the compensation circuit 02, respectively. On this basis, the first control circuit 01 can also be used to control the on-off of the output end of the compensation circuit 02 and the output end of the first control circuit 01 based on the touch enable signal.

[0078] For example, as described in the above embodiment, in the display region, the potential of the touch enable signal can be the second potential, and the potential of the display enable signal can be the first potential; in the touch region, the potential of the touch enable signal can be the first potential, and the potential of the display enable signal can be the second potential. Correspondingly, in the display region, the first control circuit 01 can control the output end of the compensation circuit 02 and the output end VCOM_FBO of the first control circuit 01 to be decoupled based on the second potential of the touch enable signal and the first potential of the display enable signal, so as to ensure that only the voltage feedback end VCOM_FBI of the common electrode line L1 and the output end VCOM_FBO of the first control circuit 01 (i.e., the first input end of the compensation circuit 02) are reliably conductive. Correspondingly, the compensation circuit 02 can reliably compensate the common voltage received by the first input end.

[0079] In addition, in the touch region, the first control circuit 01 can control the output end of the compensation circuit 02 and the output end VCOM_FBO of the first control circuit 01 (i.e., the first input end of the compensation circuit 02) to be conductive based on the first potential of the touch enable signal and the second potential of the display enable signal. Correspondingly, the common voltage VCOM output by the output end of the compensation circuit 02 can be fed back to the first input end of the compensation circuit 02, and the compensation circuit 02 can compensate the common voltage VCOM output by its output end. In this way, it can be ensured that the driving compensation circuit 02 remains in a working state, and the problem of abnormal working of the compensation circuit 02 can be avoided. In addition, in combination withFigure 2 The common voltage VCOM outputted from the output terminal of the compensation circuit 02 is not an alternating current signal of pulse type like the touch area, so it will not cause system abnormal problems as in the related art.

[0080] That is, in the embodiment of the present disclosure, in the display area, the compensation circuit 02 can perform feedback compensation on the common voltage formed on the common electrode line L1 in the display panel; in the touch area, the compensation circuit 02 can perform feedback compensation on the common voltage outputted from the output terminal to the common electrode line L1 in the display panel. And because in the touch area, the compensation circuit 02 works normally based on the direct current signal at its output terminal rather than the alternating current signal on the common electrode line L1, the working stability of the TDDI system is ensured to be good.

[0081] Optionally, Figure 5 is a structural schematic diagram of another voltage compensation circuit provided by the embodiment of the present disclosure. As Figure 5 indicated, the first control circuit 01 in the voltage compensation circuit can include a first control sub-circuit 011 and a second control sub-circuit 012.

[0082] The first control sub-circuit 011 can be coupled with the display enable end Display_en and the voltage feedback end VCOM_FBI respectively. The first control sub-circuit 011 can be used to control the on-off of the voltage feedback end VCOM_FBI and the output terminal of the first control sub-circuit 011 based on the display enable signal. The output terminal of the first control sub-circuit 011 can be coupled with the first input terminal of the compensation circuit 02.

[0083] For example, as described in the above embodiment, in the display area, the first control sub-circuit 011 can control the voltage feedback end VCOM_FBI and the output terminal of the first control sub-circuit 011 to be conductive based on the display enable signal of the first potential, so as to feedback the common voltage on the common electrode line L1 to the first input terminal of the compensation circuit 02, so that the compensation circuit 02 compensates the common voltage; and in the touch area, the first control sub-circuit 011 can control the voltage feedback end VCOM_FBI and the output terminal of the first control sub-circuit 011 to be decoupled based on the display enable signal of the second potential.

[0084] The second control sub-circuit 012 can be coupled with the touch enable end Touch_en and the output terminal of the compensation circuit 02 respectively. The second control sub-circuit 012 can be used to control the on-off of the output terminal of the compensation circuit 02 and the output terminal of the second control sub-circuit 012 based on the touch enable signal. The output terminal of the second control sub-circuit 012 can be coupled with the first input terminal of the compensation circuit 02.

[0085] For example, as described in the above embodiments, in the display region, the second control sub-circuit 012 can control the output end of the compensation circuit 02 to be uncoupled with the output end of the second control sub-circuit 012 based on the touch enable signal of the second potential; and in the touch region, the second control sub-circuit 012 can control the output end of the compensation circuit 02 to be coupled with the output end of the second control sub-circuit 012 based on the touch enable signal of the first potential, so as to feed back the common voltage outputted from the output end of the compensation circuit 02 to the common electrode line L1 to the first input end of the compensation circuit 02, so that the compensation circuit 02 compensates the common voltage.

[0086] Optionally, continuing to refer to Figure 5 It can be seen that the second control circuit 03 in the voltage compensation circuit can include a third control sub-circuit 031 and a fourth control sub-circuit 032.

[0087] The third control sub-circuit 031 can be coupled with the display enable end Display_en and the output end of the compensation circuit 02 respectively. The third control sub-circuit 031 can be used to control the on-off of the output end of the compensation circuit 02 and the output end of the third control sub-circuit 031 based on the display enable signal. The output end of the third control sub-circuit 031 is coupled with the common electrode line L1.

[0088] For example, as described in the above embodiments, in the display region, the third control sub-circuit 031 can control the output end of the compensation circuit 02 to be coupled with the output end of the third control sub-circuit 031 based on the display enable signal of the first potential, so as to transmit the common voltage outputted from the output end of the compensation circuit 02 to the common electrode line L1 coupled with the output end of the third control sub-circuit 031, ensuring the pixel P1 to emit light; and in the touch region, the third control sub-circuit 031 can control the output end of the compensation circuit 02 to be uncoupled with the output end (i.e. the common electrode line L1) of the third control sub-circuit 031 based on the display enable signal of the second potential.

[0089] The fourth control sub-circuit 032 can be coupled with the touch enable end Touch_en and the touch sensing end TSS respectively. The fourth control sub-circuit 032 can be used to control the on-off of the touch sensing end TSS and the output end of the fourth control sub-circuit 032 based on the touch enable signal. The output end of the fourth control sub-circuit 032 is coupled with the common electrode line L1.

[0090] As shown in the above embodiments, the fourth control sub-circuit 032 can control the touch sensing end TSS to be decoupled from the output end (i.e., the common electrode line L1) of the fourth control sub-circuit 032 based on the touch enable signal of the second potential in the display area; and the fourth control sub-circuit 032 can control the touch sensing end TSS to be conductive to the output end of the fourth control sub-circuit 032 based on the touch enable signal of the first potential in the touch area, so as to transmit the touch sensing signal to the common electrode line L1 coupled to the output end of the fourth control sub-circuit 032, and realize the touch sensing function.

[0091] Optionally, Figure 6 is a structural schematic diagram of still another voltage compensation circuit provided by the embodiments of the present disclosure. As shown in the above embodiments, the voltage compensation circuit provided by the embodiments of the present disclosure can further include a voltage dividing circuit (which can also be referred to as a power voltage divider) 04. Figure 6

[0092] The voltage dividing circuit 04 can be coupled to the power supply voltage end Vcc, the pull-down power supply end GND and the reference power supply end Vref respectively, and can be used to divide the power supply voltage signal provided by the power supply voltage end Vcc and the pull-down power supply signal provided by the pull-down power supply end GND, and then transmit the divided power supply voltage signal to the reference power supply end Vref. In this way, the required reference power supply signal can be flexibly generated based on the power supply voltage signal.

[0093] Optionally, as shown in the above embodiments, Figure 6 Figure 7 Figure 8 are structural schematic diagrams of still another voltage compensation circuit. Among them, Figure 7 The voltage compensation circuit shown in is coupled to the first common electrode line L1; Figure 8 The voltage compensation circuit shown in is coupled to the last common electrode line L1.

[0094] As shown in the above embodiments, Figure 7 Figure 8 The first control sub-circuit 011 can include a first switch SW1. The second control sub-circuit 012 can include a second switch SW2.

[0095] The control end of the first switch SW1 can be coupled to the display enable end Display_en, the input end of the first switch SW1 can be coupled to the voltage feedback end VCOM_FBI, and the output end of the first switch SW1 can be coupled to the first input end of the compensation circuit 02 as the output end of the first control sub-circuit 011.

[0096] ​​​​The control end of the second switch SW2 can be coupled with the touch enable end Touch_en, the input end of the second switch SW2 can be coupled with the output end of the compensation circuit 02, and the output end of the second switch SW2 can be coupled with the first input end of the compensation circuit 02 as the output end of the second control sub-circuit 012.

[0097] Optionally, with reference back to Figure 7 and Figure 8 It can be seen that the third control sub-circuit 031 can include a third switch SW3. The fourth control sub-circuit 032 can include a fourth switch SW4.

[0098] The control end of the third switch SW3 can be coupled with the display enable end Display_en, the input end of the third switch SW3 can be coupled with the output end of the compensation circuit 02, and the output end of the third switch SW3 can be coupled with the common electrode line L1 as the output end of the third control sub-circuit 031.

[0099] The control end of the fourth switch SW4 can be coupled with the touch enable end Touch_en, the input end of the fourth switch SW4 can be coupled with the touch sensing end TSS, and the output end of the fourth switch SW4 can be coupled with the common electrode line L1 as the output end of the fourth control sub-circuit 032.

[0100] Optionally, with reference back to Figure 7 and Figure 8 It can be seen that the voltage dividing circuit 04 can include a plurality of voltage dividing resistors R0, and at least one voltage dividing resistor R0 is a variable resistor.

[0101] Among the plurality of voltage dividing resistors R0, a part of the voltage dividing resistors R0 can be connected in series between the power supply voltage end Vcc and the reference power supply end Vref, and another part of the voltage dividing resistors R0 can be connected in series between the pull-down power supply end GND and the reference power supply end Vref.

[0102] For example, Figure 7 and Figure 8 In the voltage compensation circuit shown, the voltage dividing circuit 04 includes two voltage dividing resistors, a first voltage dividing resistor R0-1 and a second voltage dividing resistor R0-2. Among them, the first voltage dividing resistor R0-1 is connected in series between the power supply voltage end Vcc and the reference power supply end Vref, the second voltage dividing resistor R0-2 is connected in series between the pull-down power supply end GND and the reference power supply end Vref, and the second voltage dividing resistor R0-2 is a variable resistor. In this way, the required reference power supply signal can also be generated by flexibly adjusting the resistance value of the second voltage dividing resistor R0-2.

[0103] Optionally, with reference back to Figure 7 and Figure 8As can be seen, the compensation circuit 02 can include: an operational amplifier Amp, a first capacitor C1, a second capacitor C2, a first resistor R1, and a second variable resistor VR2.

[0104] The second capacitor C2 and the first resistor R1 can be connected in series between the inverting input terminal (-) of the operational amplifier Amp and the output terminal of the first control circuit 01, the first capacitor C1 and the second variable resistor VR2 can be connected in parallel between the inverting input terminal (-) of the operational amplifier Amp and the output terminal of the operational amplifier Amp, and the non-inverting input terminal (+) of the operational amplifier Amp can be coupled with the reference power terminal Vref. The compensation capability of the compensation circuit 02 can be adjusted by adjusting the resistance value of the second variable resistor VR2, and the noise in the signal transmitted by the compensation circuit 02 can be removed by the first capacitor C1 and the second capacitor C2.

[0105] On this basis, in combination with Figure 7 and Figure 8 As can be seen, the output terminal of the first switch SW1 and the output terminal of the second switch SW2 can be coupled with the inverting input terminal (-) of the operational amplifier Amp. The coupling node of the first voltage dividing resistor R0 and the second voltage dividing resistor R0 can be coupled with the non-inverting input terminal (+) of the operational amplifier Amp. In addition, it is referred to Figure 7 and Figure 8 As can be seen, there are some parasitic resistances on the connection lines of the switches included in the second control circuit 03 and the common electrode line L1. Under the influence of the parasitic resistances, the potential at the output terminal of the switch is generally different from the potential finally transmitted to the common electrode line L1. Therefore, in the figure, the signals at the output terminals of the third switch SW3 and the fourth switch SW4 are identified as TRX.

[0106] Optionally, on the basis of Figure 7 and Figure 8 Figure 7 a circuit structure of a first control circuit 01 is shown; Figure 8 a circuit structure of a second control circuit 03 is shown.

[0107] It is referred to Figure 9 and Figure 10 As can be seen, at least one of the first switch SW1 and the second switch SW2 included in the first control circuit 01 can include: a transmission gate (TG) switch tube, also known as a CMOS tube; or a P-type transistor, also known as a PMOS tube MP; or an N-type transistor, also known as an NMOS tube MN. Similarly, at least one of the third switch SW3 and the fourth switch SW4 included in the second control circuit 03 can include: a transmission gate switch tube; or a P-type transistor; or an N-type transistor.

[0108] For example,​Figure 9 In the case of 9a, the first switch SW1 and the second switch SW2 are both TG switch tubes; in the case of 9b, the first switch SW1 and the second switch SW2 are both PMOS tubes; and in the case of 9c, the first switch SW1 and the second switch SW2 are both NMOS tubes. Figure 10 In the case of 10a, the third switch SW3 and the fourth switch SW4 are both TG switch tubes; in the case of 10b, the third switch SW3 and the fourth switch SW4 are both PMOS tubes; and in the case of 10c, the third switch SW3 and the fourth switch SW4 are both NMOS tubes.

[0109] Optionally, in some embodiments, the voltage compensation circuit can also include a common voltage detection circuit, which can be connected between the voltage feedback end VCOM_FBI and the common electrode line L1, and can be used to reliably detect the common voltage on the common electrode line L1, so as to further feed back to the voltage feedback end VCOM_FBI. For example, the detection circuit can include a detection device similar to a sampling resistor. In addition, the voltage compensation circuit can also include a switch control circuit to provide the enable signals as described in the above embodiments to the display enable end Display_en and the touch enable end Touch_en in the display area and the touch area, respectively. For example, the switch control circuit can include a timing controller.

[0110] As described above, in the embodiments of the present disclosure, the voltage compensation circuit proposed can compensate the common voltage formed on the display panel by dividing the display area and the touch area. In the display area, the first control circuit 01 can feed back the common voltage formed on the common electrode line L1 to the compensation circuit 02 for compensation. In the touch area, the first control circuit 01 can feed back the common voltage input to the common electrode line L1 (i.e., the common voltage after compensation by the compensation circuit 02) to the compensation circuit 02 for compensation, that is, in the touch area, the pulse type AC signal formed in the display panel is changed to a DC signal and then compensated. In this way, the function of preventing the compensation circuit 02 from malfunctioning and stabilizing the operation of the TDDI system is achieved.

[0111] In summary, the embodiment of the present disclosure provides a voltage compensation circuit of a display panel. The voltage compensation circuit comprises a first control circuit, a compensation circuit and a second control circuit. The first control circuit can control the on-off of the input end of the compensation circuit and the voltage feedback end coupled with the common electrode line in the display panel based on the display enable signal provided by the display enable end. The compensation circuit can compensate the signal received by the input end. The second control circuit can control the on-off of the output end of the compensation circuit and the common electrode line based on the display enable signal and the touch enable signal provided by the touch enable end, and control the on-off of the touch sensing line for providing the touch sensing signal and the common electrode line. In this way, the display enable signal and the touch enable signal can be flexibly controlled based on the display and touch scenarios, so that the common voltage transmitted by the common electrode line to the pixels in the display area can be reliably compensated, and the quality of the image displayed by the display panel can be ensured to be better.

[0112] Figure 9 is a flowchart of a voltage compensation method of a display panel provided by the embodiment of the present disclosure. The method can be applied to the voltage compensation circuit as shown in any of Figure 10 , and Figure 11 . As shown in Figure 1 , the method comprises:

[0113] Step 1101, in response to a display instruction, providing a display enable signal of a first potential to a display enable end and a touch enable signal of a second potential to a touch enable end. The first control circuit controls the on of the voltage feedback end and the output end of the first control circuit based on the display enable signal of the first potential. The compensation circuit compensates the common voltage transmitted by the plurality of common electrode lines to the plurality of pixels in the display panel based on the reference power signal provided by the reference power end and received by the voltage feedback end, and transmits the compensated common voltage to the output end of the compensation circuit. Each second control circuit controls the on of the output end of the compensation circuit and the output end of the second control circuit based on the display enable signal of the first potential and the touch enable signal of the second potential, and controls the disconnection of the touch sensing end for providing the touch sensing signal and the output end of the second control circuit. The compensated common voltage is transmitted to the plurality of pixels through the plurality of common electrode lines coupled with the output ends of the plurality of second control circuits.

[0114] In step 1102, in response to the touch instruction, a display enable signal of the second potential is provided to the display enable end, and a touch enable signal of the first potential is provided to the touch enable end. The first control circuit controls the voltage feedback end to be uncoupled with the output end of the first control circuit based on the display enable signal of the second potential. Each second control circuit controls the output end of the compensation circuit to be uncoupled with the output end of the second control circuit and controls the touch sensing end to be conductive with the output end of the second control circuit based on the display enable signal of the second potential and the touch enable signal of the first potential. The touch sensing signal provided by the touch sensing end is transmitted to the plurality of pixels through the plurality of common electrode lines coupled with the output ends of the plurality of second control circuits.

[0115] Optionally, in the structure shown in Figures 3 to 8 The first control circuit is further coupled with the touch enable end and the output end of the compensation circuit, respectively. Correspondingly, the method can further include:

[0116] In response to the touch instruction, the first control circuit controls the output end of the compensation circuit to be conductive with the output end of the first control circuit based on the touch enable signal of the first potential. The compensation circuit compensates the common voltage transmitted by the output end of the compensation circuit based on the reference power signal.

[0117] For example, in the structure shown in Figure 11 Or Figure 3 The structure shown in the embodiment of the present disclosure, and wherein each switch is an NMOS tube, the first potential is a high potential, and the second potential is a low potential. The compensation method described in the embodiment of the present disclosure is introduced as follows:

[0118] If the current is the display area, the display enable end Display_en provides a high potential display enable signal, and at the same time, the touch enable end Touch_en provides a low potential touch enable signal. On this basis, the first switch SW1 and the third switch SW3 can be turned on, that is, closed; and the second switch SW2 and the fourth switch SW4 can be turned off, that is, not closed. Correspondingly, the voltage feedback end VCOM_FBI and the inverting input end (-) of the amplifier Amp in the compensation circuit 02 are turned on, and the output end of the amplifier Amp and the common electrode line L1 (that is, the terminal TRXO) are turned on; and the output end of the amplifier Amp and the inverting input end (-) of the amplifier Amp are disconnected, and the touch sensing end TSS and the common electrode line L1 are disconnected. Further, the voltage feedback end VCOM_FBI can feed back and transmit the common voltage collected from the common electrode line L1 to the inverting input end (-) of the amplifier Amp through the opened first switch SW1. The amplifier Amp can compensate the common voltage based on the reference power supply signal divided by the voltage dividing resistor R0, and the compensated common voltage VCOM can be further transmitted from the output end of the amplifier Amp to the common electrode line L1 through the opened third switch SW3, so that the pixel P1 coupled to the common electrode line L1 can reliably emit light.

[0119] If the current is the touch area, the display enable end Display_en provides a low potential display enable signal, and at the same time, the touch enable end Touch_en provides a high potential touch enable signal. On this basis, the first switch SW1 and the third switch SW3 can be turned off; and the second switch SW2 and the fourth switch SW4 can be closed. Correspondingly, the output end of the amplifier Amp and the inverting input end (-) of the amplifier Amp are turned on, and the touch sensing end TSS and the common electrode line L1 are turned on; and the voltage feedback end VCOM_FBI and the inverting input end (-) of the amplifier Amp are disconnected, and the output end of the amplifier Amp and the common electrode line L1 are disconnected. Further, the amplifier Amp can compensate the signal transmitted from the output end to the first input end, and since the signal output from the output end of the amplifier Amp is a direct current signal, the working stability of the compensation circuit including the amplifier Amp is good. In addition, the touch sensing signal provided by the touch sensing end TSS can be transmitted to the common electrode line L1 through the opened fourth switch SW4, realizing the touch sensing function.

[0120] That is, in this embodiment, the first switch SW1 and the second switch SW2 can cooperate to select the common voltage on the common electrode line L1 in the display area and the signal at the output terminal of the compensation circuit 02 in the touch area, respectively, and feed them back to the first input terminal of the compensation circuit 02 in the display area and the touch area for compensation processing by the compensation circuit 02. The third switch SW3 and the fourth switch SW4 can cooperate to select the compensation result of the compensation circuit 02 in the display area and the touch sensing signal in the touch area, respectively, and feed them back to the common electrode line L1 in the display area and the touch area.

[0121] The voltage transmitted to the first input terminal of the compensation circuit 02 is as follows: Figure 7 The voltage output from the VCOM_FBO compensation circuit 02 shown is as follows: Figure 8 The VCOM shown. From Figure 12 As can be seen, in this embodiment, the voltage VCOM_FBO transmitted to the first input terminal of the compensation circuit 02 and the voltage VCOM output from the output terminal of the compensation circuit 02 do not include pulse-type AC signals, i.e., they do not include the touch sensing signal TSS1. Therefore, the compensation circuit 02 can be prevented from compensating for AC signals, thus preventing malfunctions and ensuring good stability of the TDDI system.

[0122] also, Figure 12 The diagram also schematically illustrates the common voltage acquired by the voltage feedback terminal VCOM_FBI, and the signal TRX output via the third switch SW3 and the fourth switch SW4. Furthermore, although the voltage feedback terminal VCOM_FBI still acquires the pulsed AC touch sensing signal TSS1 in the touch area, because the first switch SW1 can be turned off in the display area, the transmission of the pulsed AC touch sensing signal TSS1 to the compensation circuit 02 can be avoided. Moreover, the TRX signal timing further demonstrates that, in this embodiment, the required common voltage can be reliably transmitted to the common electrode line L1 in the display area, and the required touch sensing signal can be reliably transmitted to the common electrode line L1 in the touch area.

[0123] In summary, the embodiment of the present disclosure provides a voltage compensation method of a display panel. In the method, in the display area, in the voltage compensation circuit, the first control circuit can control the voltage feedback end coupled with the common electrode line in the display panel and the input end of the compensation circuit to be conductive based on the display enable signal provided by the display enable end, the second control circuit can control the output end of the compensation circuit and the common electrode line to be conductive based on the display enable signal provided by the display enable end, and based on the touch enable signal provided by the touch enable end, the touch sensing line for providing the touch sensing signal and the common electrode line are decoupled, so that the compensation circuit transmits the compensated common voltage to the common electrode line, and the pixel can reliably emit light. In the touch area, the first control circuit can control the voltage feedback end coupled with the common electrode line in the display panel and the input end of the compensation circuit to be decoupled based on the display enable signal provided by the display enable end, the second control circuit can control the output end of the compensation circuit and the common electrode line to be decoupled based on the display enable signal provided by the display enable end, and based on the touch enable signal provided by the touch enable end, the touch sensing line and the common electrode line are conductive, so that the touch sensing signal is transmitted to the common electrode line to realize touch sensing. That is, the method can flexibly control the display enable signal and the touch enable signal, so that the common voltage transmitted by the common electrode line to the pixel in the display area is reliably compensated, and the quality of the image displayed by the display panel can be ensured to be better.

[0124] Figure 12 is a structural schematic diagram of a display device provided by the embodiment of the present disclosure. As shown in Figure 12 , the display device includes a display panel 10, and a voltage compensation circuit 00 as shown in Figure 13 , and Figure 13 any one.

[0125] Among them, in combination with Figure 1 Figures 3 to 8 Figure 1 , the display panel 10 can include a plurality of pixels P1. The voltage compensation circuit 00 can be coupled with the plurality of pixels P1 through a plurality of common electrode lines L1. The voltage compensation circuit 00 can be used to compensate the common voltage transmitted by the plurality of common electrode lines L1 to the plurality of pixels P1, and transmit the touch sensing signal to the plurality of pixels P1 through the plurality of common electrode lines L1.

[0126] Optionally, the display device recorded in the embodiment of the present disclosure can be any product or component with display function and touch function, such as LCD display device, electronic paper, mobile phone, tablet computer, television, display, notebook computer or navigator.

[0127] It should be understood that the terminology used herein is for the purpose of describing embodiments of the present disclosure only and is not intended to be limiting of the present disclosure. Unless otherwise defined, technical terms or scientific terms used in the present disclosure should be interpreted as is customary in the corresponding field of art.

[0128] As used in the specification and in the claims of the present patent application, the terms "first", "second", or "third" and the like, are used merely to distinguish one element from another, and are not intended to impose a serial or numerical order of importance.

[0129] Similarly, the terms "one" and "said" are not intended to be construed to refer to only one element, unless otherwise defined by context.

[0130] The terms "comprise", "comprising", "include", "including" and the like are meant to be interpreted as specifying the presence of stated elements or features and do not preclude the presence or addition of one or more other elements or features.

[0131] The terms "upper", "lower", "left", "right" and the like are used for ease of description to describe the orientations of an object based on the relative position relationship. When the absolute position of the described object is changed, the relative position relationship may also be changed accordingly. "Connected" or "coupled" means electrical connection.

[0132] The term "and / or", means that there can be three kinds of relationships, for example, A and / or B, can mean: A alone, A and B together, B alone, these three cases. The character " / " generally means that the associated objects before and after are in an "or" relationship.

[0133] The above description is only optional embodiments of the present disclosure, and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A voltage compensation circuit of a display panel, characterized by, The display panel comprises a plurality of pixels coupled with a plurality of common electrode lines and configured to receive common voltages and touch sensing signals transmitted from the plurality of common electrode lines; the voltage compensation circuit comprises a first control circuit, a compensation circuit and a plurality of second control circuits; The first control circuit is coupled with a display enable terminal, a voltage feedback terminal, a touch enable terminal and an output terminal of the compensation circuit, respectively, and is configured to control the on-off of the voltage feedback terminal and an output terminal of the first control circuit based on a display enable signal provided by the display enable terminal, and to control the on-off of the output terminal of the compensation circuit and the output terminal of the first control circuit based on a touch enable signal provided by the touch enable terminal; wherein the voltage feedback terminal is coupled with the plurality of common electrode lines and configured to receive common voltages transmitted from the plurality of common electrode lines to the plurality of pixels; and the potential of the display enable signal is complementary to the potential of the touch enable signal; A first input terminal of the compensation circuit is coupled with the output terminal of the first control circuit, and a second input terminal of the compensation circuit is coupled with a reference power supply terminal, and the compensation circuit is configured to compensate the common voltage received by the first input terminal based on a reference power supply signal provided by the reference power supply terminal, and transmit the compensated common voltage to an output terminal of the compensation circuit; Each of the second control circuits is coupled with the output terminal of the compensation circuit, the display enable terminal, the touch enable terminal and a touch sensing terminal configured to provide the touch sensing signal, respectively, and each of the second control circuits is configured to control the on-off of the output terminal of the compensation circuit and an output terminal of the second control circuit based on the display enable signal and the touch enable signal, and to control the on-off of the touch sensing terminal and the output terminal of the second control circuit, and the output terminals of the plurality of second control circuits are coupled with the plurality of common electrode lines.

2. The voltage compensation circuit of claim 1, wherein, The output terminals of the plurality of second control circuits are coupled with the plurality of common electrode lines one by one.

3. The voltage compensation circuit of claim 1, wherein, The first control circuit comprises a first control sub-circuit and a second control sub-circuit; The first control sub-circuit is coupled with the display enable terminal and the voltage feedback terminal, respectively, and is configured to control the on-off of the voltage feedback terminal and an output terminal of the first control sub-circuit based on the display enable signal; The second control sub-circuit is coupled with the touch enable terminal and the output terminal of the compensation circuit, respectively, and is configured to control the on-off of the output terminal of the compensation circuit and an output terminal of the second control sub-circuit based on the touch enable signal; The output terminal of the first control sub-circuit and the output terminal of the second control sub-circuit are both coupled with the first input terminal of the compensation circuit.

4. The voltage compensation circuit of claim 3, wherein, The first control sub-circuit comprises a first switch, and the second control sub-circuit comprises a second switch. The control end of the first switch is coupled with the display enable end, the input end of the first switch is coupled with the voltage feedback end, and the output end of the first switch is coupled with the first input end of the compensation circuit as the output end of the first control sub-circuit. The control end of the second switch is coupled with the touch control enable end, the input end of the second switch is coupled with the output end of the compensation circuit, and the output end of the second switch is coupled with the first input end of the compensation circuit as the output end of the second control sub-circuit.

5. The voltage compensation circuit of claim 4, wherein, At least one of the first switch and the second switch comprises a transmission gate switch tube, a P-type transistor, or an N-type transistor.

6. The voltage compensation circuit according to any one of claims 1 to 5, characterized in that, The second control circuit comprises a third control sub-circuit and a fourth control sub-circuit. The third control sub-circuit is coupled with the display enable end and the output end of the compensation circuit respectively, and the third control sub-circuit is configured to control the connection between the output end of the compensation circuit and the output end of the third control sub-circuit based on the display enable signal. The fourth control sub-circuit is coupled with the touch control enable end and the touch control sensing end respectively, and the fourth control sub-circuit is configured to control the connection between the touch control sensing end and the output end of the fourth control sub-circuit based on the touch control enable signal. The output end of the third control sub-circuit and the output end of the fourth control sub-circuit are coupled with the common electrode line.

7. The voltage compensation circuit of claim 6, wherein, The third control sub-circuit comprises a third switch, and the fourth control sub-circuit comprises a fourth switch. The control end of the third switch is coupled with the display enable end, the input end of the third switch is coupled with the output end of the compensation circuit, and the output end of the third switch is coupled with the common electrode line as the output end of the third control sub-circuit. The control end of the fourth switch is coupled with the touch control enable end, the input end of the fourth switch is coupled with the touch control sensing end, and the output end of the fourth switch is coupled with the common electrode line as the output end of the fourth control sub-circuit.

8. The voltage compensation circuit of claim 7, wherein, At least one of the third switch and the fourth switch comprises a transmission gate switch tube, a P-type transistor, or an N-type transistor.

9. The voltage compensation circuit according to any one of claims 1 to 5, characterized by The voltage compensation circuit further comprises a voltage dividing circuit. The voltage dividing circuit is coupled with a power supply voltage end, a pull-down power supply end, and the reference power supply end respectively, and the voltage dividing circuit is configured to transmit the power supply voltage signal provided by the power supply voltage end to the reference power supply end after voltage dividing processing based on the power supply voltage signal and a pull-down power supply signal provided by the pull-down power supply end.

10. The voltage compensation circuit of claim 9, wherein, The voltage dividing circuit comprises a plurality of voltage dividing resistors, and at least one of the voltage dividing resistors is a variable resistor. In the plurality of voltage dividing resistors, a part of the voltage dividing resistors are connected in series between the power supply voltage end and the reference power supply end, and another part of the voltage dividing resistors are connected in series between the pull-down power supply end and the reference power supply end.

11. The voltage compensation circuit of claim 10, wherein, The voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor. The first voltage dividing resistor is connected in series between the power supply voltage terminal and the reference power supply terminal, the second voltage dividing resistor is connected in series between the pull-down power supply terminal and the reference power supply terminal, and the second voltage dividing resistor is a variable resistor.

12. The voltage compensation circuit according to any one of claims 1 to 5, characterized by The compensation circuit comprises an operational amplifier, a first capacitor, a second capacitor, a first resistor and a second variable resistor. The first resistor and the second capacitor are connected in series between the inverting input terminal of the operational amplifier and the output terminal of the first control circuit, the first capacitor and the second variable resistor are connected in parallel between the inverting input terminal of the operational amplifier and the output terminal of the operational amplifier, and the non-inverting input terminal of the operational amplifier is coupled with the reference power supply terminal.

13. A voltage compensation method of a display panel, the method comprising: The application is applied to the voltage compensation circuit as claimed in any one of claims 1 to 12; the method comprises: In response to a display instruction, a display enable signal of a first potential is provided to the display enable terminal, and a touch enable signal of a second potential is provided to the touch enable terminal; the first control circuit controls the voltage feedback terminal and the output terminal of the first control circuit to be conductive based on the display enable signal of the first potential; the compensation circuit compensates the common voltage transmitted by a plurality of common electrode lines received by the voltage feedback terminal to a plurality of pixels in the display panel based on a reference power supply signal provided by the reference power supply terminal, and transmits the compensated common voltage to the output terminal of the compensation circuit; each second control circuit controls the output terminal of the compensation circuit and the output terminal of the second control circuit to be conductive, and controls the touch sensing terminal and the output terminal of the second control circuit to be decoupled for providing a touch sensing signal, based on the display enable signal of the first potential and the touch enable signal of the second potential; and the compensated common voltage is transmitted to the plurality of pixels through a plurality of common electrode lines coupled with the output terminals of the plurality of second control circuits. In response to a touch instruction, a display enable signal of a second potential is provided to the display enable terminal, and a touch enable signal of a first potential is provided to the touch enable terminal; the first control circuit controls the voltage feedback terminal and the output terminal of the first control circuit to be decoupled based on the display enable signal of the second potential; each second control circuit controls the output terminal of the compensation circuit and the output terminal of the second control circuit to be decoupled, and controls the touch sensing terminal and the output terminal of the second control circuit to be conductive, based on the display enable signal of the second potential and the touch enable signal of the first potential; and the touch sensing signal provided by the touch sensing terminal is transmitted to the plurality of pixels through a plurality of common electrode lines coupled with the output terminals of the plurality of second control circuits.

14. The method of claim 13, wherein, The first control circuit is further coupled with the touch enable terminal and the output terminal of the compensation circuit, respectively; and the method further comprises: In response to the touch instruction, the first control circuit controls the output terminal of the compensation circuit and the output terminal of the first control circuit to be conductive based on the touch enable signal of the first potential; and the compensation circuit compensates the common voltage transmitted by the output terminal of the compensation circuit based on the reference power supply signal.

15. A display device comprising: The display device comprises a display panel and the voltage compensation circuit according to any one of claims 1 to 12, and the display panel comprises a plurality of pixels. The voltage compensation circuit is coupled with the plurality of pixels through a plurality of common electrode lines, and is configured to compensate a common voltage transmitted by the plurality of common electrode lines to the plurality of pixels, and transmit a touch sensing signal to the plurality of pixels through the plurality of common electrode lines.

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