Common voltage compensation circuit, driving circuit and display device

Abstract

The present application discloses a common voltage compensation circuit, a driving circuit, and a display device. The common voltage compensation circuit is used to compensate for the common voltage of a display panel. The common voltage compensation circuit includes a common compensation voltage generation module and a common compensation voltage output control module. The common compensation voltage generation module generates a common compensation voltage based on a feedback voltage on a common voltage feedback line within the display panel and a preset common voltage. The common compensation voltage output control module generates a control signal based on the rising and / or falling edges of a high-frequency signal within the display panel to control the output of the common compensation voltage generated by the common compensation voltage generation module to the common voltage line within the display panel. The present application mainly ensures the accuracy of the common voltage feedback signal based on the rising and / or falling edges of the high-frequency signal, avoiding the common voltage offset caused by the coupled common voltage feedback signal being amplified and output to the display panel, resulting in the generation of horizontal stripes.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a common voltage compensation circuit, a driving circuit, and a display device. Background Art

[0002] In the liquid crystal display (LCD) industry, with the advancement of LCD technology, consumers have increasingly demanded higher quality displays from LCD panels. Among these, display defects related to the common voltage (VCOM) are particularly prominent.

[0003] To address the problem of VCOM coupling and improve display quality, LCD manufacturers often add a VCOM compensation circuit. This circuit samples the VCOM fluctuations within the panel and then feeds them into an operational amplifier (OP). After compensation, it is then fed back into the panel. The common voltage feedback signal (VCOM Feedback) must accurately capture the VCOM fluctuations within the panel. However, the panel's internal wiring is complex and contains many high-frequency signals. These high-frequency signals couple the VCOM Feedback signal. The coupled VCOM Feedback signal is then amplified and compensated by the operational amplifier (OP) before being output to the display panel. This can cause VCOM offset within the display panel and produce the horizontal streaking problem. Summary of the Invention

[0004] The purpose of the present application is to provide a common voltage compensation circuit, a driving circuit and a display device that can improve the horizontal stripe defect caused by common voltage offset.

[0005] The present application discloses a common voltage compensation circuit, which is used to compensate for the common voltage of a display panel. The display panel is provided with a common voltage feedback line for feeding back a common voltage waveform. The common voltage compensation circuit includes a common compensation voltage generation module and a common compensation voltage output control module. The common compensation voltage generation module generates a common compensation voltage based on the feedback voltage on the common voltage feedback line in the display panel and a preset common voltage; the common compensation voltage output control module is connected to the common compensation voltage generation module at one end and to the common voltage routing in the display panel at the other end, and generates a control signal according to the rising edge and / or falling edge of the high-frequency signal in the display panel to control the common compensation voltage generated by the common compensation voltage generation module to be output to the common voltage routing in the display panel.

[0006] Optionally, the common compensation voltage output control module includes a switching unit and a control signal generating unit, the switching unit being connected to the common compensation voltage generating module for controlling the output of the common compensation voltage generated by the common compensation voltage generating module; the control signal generating unit obtaining the high-frequency signal of the display panel, and generating a control signal according to the rising edge and / or falling edge of the high-frequency signal, to output to the control end of the switching unit, to control the switching unit to be turned on or off, so that the common compensation voltage generating module outputs the common compensation voltage to the common voltage routing in the display panel.

[0007] Optionally, the high-frequency signal includes a gate drive signal, and the control signal generating unit includes a trigger, a first circuit, a second circuit and a third circuit; the gate drive signal includes a first gate drive signal, and the first gate drive signal generates a second gate drive signal after being delayed by the trigger; the trigger includes a clock signal port, an input data port and an output port, the clock signal port receives a clock signal, the input data port receives the first gate drive signal, and the output port outputs the second gate drive signal to the first input end of the first circuit, the second circuit and the third circuit respectively, and the second input end of the first circuit, the second circuit and the third circuit respectively receive the second gate drive signal; wherein, the first circuit includes an exclusive OR circuit, the second circuit and the third circuit include an AND gate circuit, the first circuit generates a first control signal according to the rising edge or falling edge of the first gate drive signal and the second gate drive signal, and outputs it to the control end of the switch unit, the second circuit generates a second control signal according to the falling edge of the first gate drive signal and the second gate drive signal, and outputs it to the control end of the switch unit, and the third circuit generates a third control signal according to the rising edge of the first gate drive signal and the second gate drive signal, and outputs it to the control end of the switch unit.

[0008] Optionally, the common compensation voltage generating module includes an operational amplifier, a first resistor and a second resistor, the operational amplifier includes a positive polarity input terminal, a negative polarity input terminal, a power input terminal, a ground terminal and an output terminal, the positive polarity input terminal of the operational amplifier receives a preset common voltage, the negative polarity input terminal of the operational amplifier receives a feedback voltage on a common voltage feedback line, the power input terminal of the operational amplifier is connected to the power supply voltage, the ground terminal of the operational amplifier is grounded, the output terminal of the operational amplifier is connected to the input terminal of the switching unit, and the output terminal of the switching unit is connected to the common voltage routing in the display panel; the control terminal of the switching unit is connected to the control signal generating unit; the input terminal of the first resistor is connected to the common voltage feedback line in the display panel, and the output terminal is connected to the negative polarity input terminal of the operational amplifier, the input terminal of the second resistor is connected to the output terminal of the first resistor, and the output terminal is connected to the input terminal of the switching unit; wherein, the switching unit includes a transistor or a triode.

[0009] Optionally, the common compensation voltage generating module includes an operational amplifier, a first resistor and a second resistor, the operational amplifier includes a positive polarity input terminal, a negative polarity input terminal, a power input terminal, a ground terminal and an output terminal, the positive polarity input terminal of the operational amplifier receives a preset common voltage, the negative polarity input terminal of the operational amplifier receives a feedback voltage on a common voltage feedback line, the power input terminal of the operational amplifier is connected to the power supply voltage through the switch unit, the ground terminal of the operational amplifier is grounded, and the output terminal of the operational amplifier is connected to the common voltage routing in the display panel; the output terminal of the switch unit is connected to the power input terminal of the operational amplifier, the input terminal of the switch unit is connected to the power supply voltage, and the control terminal of the switch unit is connected to the control signal generating unit; the input terminal of the first resistor is connected to the common voltage feedback line in the display panel, and the output terminal is connected to the negative polarity input terminal of the operational amplifier, the input terminal of the second resistor is connected to the output terminal of the first resistor, and the output terminal is connected to the output terminal of the operational amplifier; wherein, the switch unit includes a transistor or a triode.

[0010] Optionally, the common compensation voltage output control module also includes a control signal adjustment unit, one end of the control signal adjustment unit is connected to the output ends of the first circuit, the second circuit and the third circuit respectively through a first switch, and the other end of the control signal adjustment unit is connected to the control end of the switch unit; the control signal adjustment unit includes a third resistor, a fourth resistor and a first capacitor, one end of the first capacitor is connected to the control end of the switch unit, the other end of the first capacitor is grounded, one end of the third resistor is connected to the first switch, the other end of the third resistor is connected to the control end of the switch unit, one end of the fourth resistor is connected to the third resistor, and the other end of the fourth resistor is connected to the ground end of the first capacitor; wherein, the third resistor is an adjustable resistor.

[0011] Optionally, the common compensation voltage output control module includes a comparison unit, which is connected to the control end of the switching unit and the trigger, obtains the voltage value of the gate drive signal of the display panel in real time, and calculates the voltage difference of the rising edge or the falling edge. If the voltage difference is less than the voltage difference of the rising edge or the falling edge of the preset gate drive signal, the switching unit is controlled to be turned on; if the voltage difference is greater than or equal to the voltage difference of the rising edge or the falling edge of the preset gate drive signal, the gate drive signal is output to the negative polarity input end of the trigger of the control signal generation unit.

[0012] Optionally, the common voltage compensation circuit further includes a voltage stabilizing module, one end of the voltage stabilizing module is connected between the output end of the switch unit and the common wiring in the display panel, and the other end of the voltage stabilizing module is grounded.

[0013] The present application also discloses a driving circuit, which includes a common voltage compensation circuit as described above, and further includes a timing control module, which outputs a gate drive signal, a clock signal and a common voltage signal to the common voltage compensation circuit.

[0014] The present application also discloses a display device, which includes a display panel and any one of the driving circuits described above, wherein the driving circuit is used to drive the display panel.

[0015] Compared to a scheme that directly collects feedback signals to compensate for a common voltage, the present application provides a common voltage compensation circuit that generates a common compensation voltage based on a feedback voltage on a common voltage feedback line within a display panel and a preset common voltage. A common compensation voltage output control module generates a control signal based on the rising and / or falling edges of a high-frequency signal within the display panel to control the output of the common compensation voltage generated by the common compensation voltage generation module to a common voltage routing within the display panel. When the rising and / or falling edges of the high-frequency signal have a significant coupling to the common voltage feedback line, the routing within the display panel for the common compensation voltage input is disconnected. If the rising and / or falling edges of the high-frequency signal have no effect on the common voltage feedback line, the common compensation voltage is output to the common voltage routing within the display panel. This improves interference in the common compensation voltage caused by significant coupling of the common voltage feedback line and prevents the coupled VCOM feedback signal from being output to the display panel after being amplified by the common compensation voltage generation module, causing VCOM offset within the display panel and resulting in horizontal streaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0017] Figure 1 is a structural diagram of a common voltage compensation circuit according to a first embodiment of the present application;

[0018] Figure 2 is a structural diagram of a common voltage compensation circuit according to a second embodiment of the present application;

[0019] Figure 3 is a circuit diagram of a control signal generating unit according to a second embodiment of the present application;

[0020] Figure 4 is a signal waveform diagram in the circuit of the control signal generating unit of the second embodiment of the present application;

[0021] Figure 5 is a common compensation voltage output circuit diagram of the second embodiment of the present application;

[0022] Figure 6 is another common compensation voltage output circuit diagram of the second embodiment of the present application;

[0023] Figure 7is a common voltage compensation circuit diagram of the third embodiment of the present application;

[0024] Figure 8 is a common voltage compensation circuit diagram of the fourth embodiment of the present application;

[0025] Figure 9 is a structural diagram of a common voltage compensation circuit according to a fifth embodiment of the present application;

[0026] Figure 10 is a structural diagram of a common voltage compensation circuit according to a fifth embodiment of the present application;

[0027] Figure 11 is a schematic structural diagram of a driving circuit according to a sixth embodiment of the present application;

[0028] Figure 12 It is a structural schematic diagram of a display device according to the seventh embodiment of the present application.

[0029] Among them, 100, common voltage compensation circuit; 110, common compensation voltage generating module; 120, common compensation voltage output control module; 121, switching unit; 122, control signal generating unit; 123, control signal adjusting unit; 124, comparison unit; 130, voltage stabilizing module; 200, driving circuit; 210, timing control module; 300, display panel; 310, common voltage feedback line; 320, common voltage routing; 400, display device; OE-control signal; OP-operational amplifier; D1-trigger; A1-first circuit; A2-second circuit; A3-third circuit; first resistor-R1; second resistor-R2; third resistor-R3; fourth resistor-R4; first capacitor-C1; first switch-SW1. DETAILED DESCRIPTION

[0030] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0031] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0032] refer to Figure 1As shown, as the first embodiment of the present application, a common voltage compensation circuit 100 is disclosed, which is used to compensate for the common voltage of the display panel 300. The display panel 300 is provided with a common voltage feedback line 310 for feeding back the common voltage waveform. The common voltage compensation circuit 100 includes a common compensation voltage generation module 110 and a common compensation voltage output control module 120. The common compensation voltage generation module 110 generates a common compensation voltage according to the feedback voltage on the common voltage feedback line 310 in the display panel 300 and a preset common voltage; the common compensation voltage output control module 120 is connected to the common compensation voltage generation module 110 at one end and to the common voltage wiring 320 in the display panel 300 at the other end, and generates a control signal according to the rising edge and / or falling edge of the high-frequency signal in the display panel 300 to control the common compensation voltage generated by the common compensation voltage generation module 110 to be output to the common voltage wiring 320 in the display panel 300.

[0033] In this embodiment, the common compensation voltage generation module 110 generates a common compensation voltage based on the feedback voltage on the common voltage feedback line 310 in the display panel 300 and the preset common voltage. However, after the generation, the common compensation voltage is not immediately output to the common voltage line 320 in the display panel 300. Instead, the output is controlled by the common compensation voltage output control module 120. The control logic of the common compensation voltage output control module 120 is mainly determined by the rising edge and / or falling edge of the high-frequency signal. When the high-frequency signal is continuously at a high level or a low level, the feedback voltage on the common voltage feedback line 310 is less disturbed. The common compensation voltage generated by the common compensation voltage generation module 110 is relatively accurate and can be input to the display panel. The common voltage trace 320 in 300 realizes display. When the high-frequency signal is at the rising edge or falling edge, that is, when the level is switched, the feedback voltage on the common voltage feedback line 310 is greatly disturbed. The common compensation voltage generated by the common compensation voltage generation module 110 is controlled not to be input into the common voltage trace 320 in the display panel 300, thereby shielding the interference to the VCOM compensation circuit caused by the high-low level switching of the high-frequency signal. This prevents the coupled common voltage feedback signal (VCOMFeedback) from being output to the display panel 300 after being operationally amplified by the common compensation voltage generation module 110, causing VCOM deviation in the display panel 300 and generating horizontal stripe defects.

[0034] refer to Figure 2 As shown, as the second embodiment of the present application, it is a further refinement and improvement of the above-mentioned first embodiment, referring to Figures 2 to 6As shown, the common compensation voltage output control module 120 includes a switch unit 121 and a control signal generating unit 122. The switch unit 121 is connected to the common compensation voltage generating module 110 and is used to control the output of the common compensation voltage generated by the common compensation voltage generating module 110. The control signal generating unit 122 obtains the high-frequency signal of the display panel 300 and generates a control signal according to the rising edge and / or falling edge of the high-frequency signal to output to the control end of the switch unit 121 to control the switch unit 121 to be turned on or off, so that the common compensation voltage generating module 110 outputs the common compensation voltage to the common voltage trace 320 in the display panel 300. The high-frequency signal includes a gate drive signal, which is a drive signal related to Gate Driver Less (gate driver) technology, also known as a GDL signal, also called a cascade drive signal.

[0035] Generally, the common compensation voltage output control module 120 is composed of a switch unit 121 and a control signal generating unit 122. The switch unit 121 includes a transistor (MOS) or a triode. The control signal generating unit 122 generates a control signal according to the rising edge and / or falling edge of the high-frequency signal, and outputs the control signal to the control end of the switch unit 121 to control the switch unit 121 to be turned on or off. Here, the switch unit 121 directly controls the output of the common compensation voltage. Before the common compensation voltage is output to the common voltage trace 320 in the display panel 300, a voltage stabilizing module 130 is further provided. Specifically, the common voltage compensation circuit 100 further includes a voltage stabilizing module 130, one end of which is connected between the output end of the switch unit 121 and the common trace in the display panel 300, and one end is grounded. The voltage stabilizing module 130 mainly includes a voltage stabilizing resistor, which consumes the fluctuating part of the common compensation voltage output by the switch unit 121 in itself through the voltage dividing effect of the resistor, thereby stabilizing the common compensation voltage transmitted to the display panel 300.

[0036] Furthermore, the high-frequency signal takes the gate drive signal as an example, and the control signal generating unit 122 includes a trigger, a first circuit A1, a second circuit A2, and a third circuit A3; the gate drive signal includes a first gate drive signal, and the first gate drive signal generates a second gate drive signal after the trigger delay; the trigger includes a clock signal port, an input data port, and an output port, the clock signal port receives a clock signal, the input data port receives the first gate drive signal, and the output port outputs the second gate drive signal to the first input end of the first circuit A1, the second circuit A2, and the third circuit A3 respectively, and the first circuit A1, the second circuit A2, and the third circuit A3 are respectively output. The second input end of the circuit A3 receives the second gate drive signal respectively; wherein, the first circuit A1 includes an exclusive OR circuit, the second circuit A2 and the third circuit A3 include an AND gate circuit, the first circuit A1 generates a first control signal according to the rising edge or falling edge of the first gate drive signal and the second gate drive signal, and outputs it to the control end of the switch unit 121, the second circuit A2 generates a second control signal according to the falling edge of the first gate drive signal and the second gate drive signal, and outputs it to the control end of the switch unit 121, and the third circuit A3 generates a third control signal according to the rising edge of the first gate drive signal and the second gate drive signal, and outputs it to the control end of the switch unit 121.

[0037] It should also be noted that the common compensation voltage generating module 110 includes an operational amplifier, a first resistor R1 and a second resistor R2. The operational amplifier includes a positive input terminal, a negative input terminal, a power input terminal, a ground terminal and an output terminal. The positive input terminal of the operational amplifier receives a preset common voltage, the negative input terminal of the operational amplifier receives the feedback voltage on the common voltage feedback line 310, the power input terminal of the operational amplifier is connected to the power voltage, the ground terminal of the operational amplifier is grounded, the output terminal of the operational amplifier is connected to the input terminal of the switch unit 121, and the output terminal of the switch unit 121 is connected to the common voltage line 320 in the display panel 300; the control terminal of the switch unit 121 is connected to the control signal generating unit 122; the input terminal of the first resistor R1 is connected to the common voltage feedback line 310 in the display panel 300 to obtain the common voltage feedback signal (VCOM Feedback), and the output terminal is connected to the negative input terminal of the operational amplifier. The input terminal of the second resistor R2 is connected to the output terminal of the first resistor R1, and the output terminal is connected to the input terminal of the switch unit 121.

[0038] Specifically, Figure 3This is a circuit diagram of the control signal generating unit 122, which is used to obtain the rising edge, falling edge, or rising and falling edge information of the GDL signal. The GDL signal is generally a collective name for STV / CLK / LC in the LCD panel driving circuit 200. D1 is a D flip-flop, System_CLK is a clock signal, GDL following is the falling edge of the GDL signal, GDLrising is the rising edge of the GDL signal, and GDL rising is the rising edge of the GDL signal. and following are the rising edge and falling edge of GDL; when the GDL signal passes through the trigger D1, a GDL signal GDL_Delay delayed by 1 System_CLK is obtained, that is, the first gate drive signal is converted into a second gate drive signal, the first gate drive signal is represented by GDL, and the second gate drive signal is represented by GDL_Delay; further, the second gate drive signal (GDL_Delay) is inverted, and after the inversion of GDL_Delay, an AND operation is performed with GDL through the third circuit A3 (A3) (A3 is an AND gate circuit) to obtain GDL_rising, that is, the rising edge information of the GDL signal; after the inversion of GDL, an AND operation is performed with GDL_Delay (A2 is an AND gate circuit) to obtain GDL_following, that is, the falling edge information of GDL; after the exclusive OR operation of GDL and GDL_Delay (A1 is an exclusive OR circuit), GDL_rising&following, that is, the rising edge and falling edge information of GDL, is obtained; Figure 4 To control the output waveform of each signal in the circuit of the signal generating unit 122, the rising edge and falling edge information of the GDL signal can be obtained; Figure 3 The GDL_rising or GDL_following or GDL_rising&following obtained in the code is used as the control signal OE to control Figure 5 or Figure 6 The MOS tube or transistor is turned on or off.

[0039] Similarly, Figure 5 This is the OE signal control MOS tube control common compensation voltage output circuit diagram, Figure 6 This is a circuit diagram of the common compensation voltage output controlled by the OE signal controlling the transistor. When the control signal OE is low, this is the time when GDL is continuously high or low, the MOS tube or transistor is normally turned on, and the operational amplifier (OP) normally outputs the compensated VCOM voltage to the surface. When OE is high, this is the high-low level switching period of GDL, the MOS tube or transistor is turned off, and the operational amplifier cannot output the compensated VCOM voltage to the display panel 300, thereby shielding the interference of the Couple on the VCOM compensation circuit caused by the high-low level switching of GDL.

[0040] refer to Figure 7 As shown, the third embodiment of the present application is a further refinement and improvement of the first embodiment. The difference from the second embodiment is that the reference Figure 3 , Figure 4 and Figure 7 As shown, the common compensation voltage generating module 110 includes an operational amplifier OP, a first resistor R1 and a second resistor R2. The operational amplifier OP includes a positive input terminal, a negative input terminal, a power input terminal, a ground terminal and an output terminal. The positive input terminal of the operational amplifier OP receives a preset common voltage, the negative input terminal of the operational amplifier receives a feedback voltage on the common voltage feedback line 310, the power input terminal of the operational amplifier is connected to the power voltage through the switch unit 121, the ground terminal of the operational amplifier is grounded, and the output terminal of the operational amplifier is connected to the common voltage trace 320 in the display panel 300; the output terminal of the switch unit 121 is connected to the power input terminal of the operational amplifier, and the input terminal of the switch unit 121 is connected to the power voltage. The control end of the switch unit 121 is connected to the control signal generating unit 122; the input end of the first resistor R1 is connected to the common voltage feedback line 310 in the display panel 300, and the output end is connected to the negative polarity input end of the operational amplifier; the input end of the second resistor R2 is connected to the output end of the first resistor R1, and the output end is connected to the output end of the operational amplifier; wherein, the switch unit 121 includes a transistor or a triode; when OE is low, this is the time when GDL is continuously high or low level, the MOS tube is normally turned on, the operational amplifier OP is normally powered, and the VCOM compensation circuit also works normally; when OE is high, this is the time when GDL is high and low level switching, the MOS tube is turned off, the OP cannot be powered normally and thus does not work, and the VCOM compensation circuit also does not work.

[0041] refer to Figure 8 As shown, as the fourth embodiment of the present application, it is also a further refinement and improvement of the above second embodiment or third embodiment, refer to Figure 3 , Figure 4 and Figure 8As shown, the common compensation voltage output control module 120 also includes a control signal adjustment unit 123, one end of the control signal adjustment unit 123 is respectively connected to the output ends of the first circuit A1, the second circuit A2 and the third circuit A3 through the first switch SW1, and the other end of the control signal adjustment unit 123 is connected to the control end of the switch unit 121; the control signal adjustment unit 123 includes a third resistor R3, a fourth resistor R4 and a first capacitor C1, one end of the first capacitor C1 is connected to the control end of the switch unit 121, and the other end of the first capacitor C1 is grounded, one end of the third resistor R3 is connected to the first switch SW1, and the other end of the third resistor R3 is connected to the control end of the switch unit 121, one end of the fourth resistor R4 is connected to the third resistor R3, and the other end of the fourth resistor R4 is connected to the ground end of the first capacitor C1; wherein, the third resistor R3 is an adjustable resistor.

[0042] In this embodiment, the transistor (MOS) has a threshold voltage Vth. After the signal passes through the first switch SW1, it is divided by R3 and R4. VOE=V&R4 / (R3+R4), where V represents the voltage level before R3. R3 is an adjustable resistor. The threshold can be adjusted by adjusting R3. The adjustable range is 0% to 100%. The conduction of the MOS tube in the switch unit 121 can be controlled according to the size of the fluctuation range to achieve the output of the common compensation voltage.

[0043] refer to Figure 9 As shown, as the fifth embodiment of the present application, it is a further improvement of the above-mentioned second embodiment or third embodiment, the common compensation voltage output control module 120 includes a comparison unit 124, and the comparison unit 124 is connected to the control end of the switch unit 121 and the trigger, and obtains the voltage value of the gate drive signal of the display panel 300 in real time, and calculates the voltage difference of the rising edge or the falling edge. If the voltage difference is less than the voltage difference of the rising edge or the falling edge of the preset gate drive signal, the switch unit 121 is controlled to be turned on; if the voltage difference is greater than or equal to the voltage difference of the rising edge or the falling edge of the preset gate drive signal, the gate drive signal is output to the negative polarity input end of the trigger of the control signal generation unit 122.

[0044] In this example, when the rising / falling edge voltage difference of the gate drive signal is less than a preset threshold, the module performs voltage compensation by turning on switch unit 121. This mechanism can effectively correct the problem of signal edge slope caused by transmission loss, parasitic capacitance, or insufficient drive capability, ensuring that the trigger receives a steep edge signal and reducing the risk of false triggering. By monitoring the voltage difference in real time, the module can adapt to different operating conditions (such as temperature changes, panel aging, or long trace attenuation), dynamically adjust the compensation strategy, maintain signal integrity, and significantly improve the edge quality of the gate drive signal through the intelligent compensation mechanism, enhancing the stability of the display panel 300 under complex operating conditions.

[0045] As shown in Reference 11, as the sixth embodiment of the present application, a driving circuit 200 is disclosed, including the common voltage compensation circuit 100 as described in any of the above embodiments, and the driving circuit 200 also includes a timing control module 210, and the timing control module 210 outputs a gate drive signal, a clock signal and a common voltage signal to the common voltage compensation circuit 100.

[0046] As shown in Reference 12, as the seventh embodiment of the present application, a display device 400 is disclosed, which includes a display panel 300 and a driving circuit 200. The driving circuit 200 includes a common voltage compensation circuit 100 as described above. The common compensation voltage generation module 110 of the common voltage compensation circuit 100 generates a common compensation voltage based on the feedback voltage on the common voltage feedback line 310 in the display panel 300 and a preset common voltage. The common compensation voltage output control module 120 generates a control signal according to the rising edge and / or falling edge of the high-frequency signal in the display panel 300 to control the common compensation voltage generated by the common compensation voltage generation module 110 to be output to the common voltage line 320 in the display panel 300, thereby improving the interference of the common compensation voltage caused by the large coupling of the common voltage feedback line 310, and avoiding the coupled VCOM Feedback signal being amplified by the operational amplifier OP and then output to the plane, causing the in-plane VCOM offset and generating the horizontal stripe defect phenomenon.

[0047] It should be noted that the inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.

[0048] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A common voltage compensation circuit for compensating a common voltage of a display panel, wherein the display panel is provided with a common voltage feedback line for feeding back a common voltage waveform, characterized in that: The common voltage compensation circuit includes: a common compensation voltage generating module, which generates a common compensation voltage according to a feedback voltage on a common voltage feedback line in the display panel and a preset common voltage; and a common compensation voltage output control module, one end of which is connected to the common compensation voltage generation module and the other end of which is connected to the common voltage trace within the display panel, and which generates a control signal according to the rising edge and / or falling edge of the high-frequency signal within the display panel to control the common compensation voltage generated by the common compensation voltage generation module to be output to the common voltage trace within the display panel; Wherein, the common compensation voltage output control module includes: a switch unit connected to the common compensation voltage generating module and configured to control the output of the common compensation voltage generated by the common compensation voltage generating module; and a control signal generating unit, which obtains a high-frequency signal from the display panel and generates a control signal according to the rising edge and / or falling edge of the high-frequency signal, and outputs the control signal to the control terminal of the switch unit to control the switch unit to be turned on or off, so that the common compensation voltage generating module outputs the common compensation voltage to the common voltage trace in the display panel; The high-frequency signal includes a gate drive signal, and the control signal generating unit includes a trigger, a first circuit, a second circuit, and a third circuit; the gate drive signal includes a first gate drive signal, and the first gate drive signal generates a second gate drive signal after being delayed by the trigger; The trigger includes a clock signal port, an input data port, and an output port, wherein the clock signal port receives a clock signal, the input data port receives a first gate drive signal, and the output port outputs a second gate drive signal to the first input terminals of the first circuit, the second circuit, and the third circuit, respectively, and the second input terminals of the first circuit, the second circuit, and the third circuit respectively receive the second gate drive signal; Among them, the first circuit includes an XOR circuit, the second circuit and the third circuit include an AND gate circuit, the first circuit generates a first control signal according to the rising edge or falling edge of the first gate drive signal and the second gate drive signal, and outputs it to the control end of the switch unit, the second circuit generates a second control signal according to the falling edge of the first gate drive signal and the second gate drive signal, and outputs it to the control end of the switch unit, and the third circuit generates a third control signal according to the rising edge of the first gate drive signal and the second gate drive signal, and outputs it to the control end of the switch unit.

2. The common voltage compensation circuit according to claim 1, wherein: The common compensation voltage generating module includes an operational amplifier, a first resistor and a second resistor. The operational amplifier includes a positive input terminal, a negative input terminal, a power input terminal, a ground terminal and an output terminal. The positive input terminal of the operational amplifier receives a preset common voltage, the negative input terminal of the operational amplifier receives a feedback voltage on a common voltage feedback line, the power input terminal of the operational amplifier is connected to the power voltage, the ground terminal of the operational amplifier is grounded, the output terminal of the operational amplifier is connected to the input terminal of the switch unit, and the output terminal of the switch unit is connected to the common voltage routing in the display panel; the control terminal of the switch unit is connected to the control signal generating unit; the input terminal of the first resistor is connected to the common voltage feedback line in the display panel, and the output terminal is connected to the negative input terminal of the operational amplifier; the input terminal of the second resistor is connected to the output terminal of the first resistor, and the output terminal is connected to the input terminal of the switch unit; Wherein, the switching unit includes a transistor or a triode.

3. The common voltage compensation circuit according to claim 1, wherein: The common compensation voltage generating module includes an operational amplifier, a first resistor and a second resistor. The operational amplifier includes a positive input terminal, a negative input terminal, a power input terminal, a ground terminal and an output terminal. The positive input terminal of the operational amplifier receives a preset common voltage, the negative input terminal of the operational amplifier receives a feedback voltage on a common voltage feedback line, the power input terminal of the operational amplifier is connected to the power voltage through the switch unit, the ground terminal of the operational amplifier is grounded, and the output terminal of the operational amplifier is connected to a common voltage line in a display panel; the output terminal of the switch unit is connected to the power input terminal of the operational amplifier, the input terminal of the switch unit is connected to the power voltage, and the control terminal of the switch unit is connected to the control signal generating unit; the input terminal of the first resistor is connected to the common voltage feedback line in the display panel, and the output terminal is connected to the negative input terminal of the operational amplifier; the input terminal of the second resistor is connected to the output terminal of the first resistor, and the output terminal is connected to the output terminal of the operational amplifier; Wherein, the switching unit includes a transistor or a triode.

4. The common voltage compensation circuit according to claim 1, wherein: The common compensation voltage output control module further includes a control signal adjustment unit, one end of which is connected to the output ends of the first circuit, the second circuit, and the third circuit respectively through a first switch, and the other end of which is connected to the control end of the switch unit; The control signal adjustment unit includes a third resistor, a fourth resistor and a first capacitor, one end of the first capacitor is connected to the control end of the switch unit, and the other end of the first capacitor is grounded; one end of the third resistor is connected to the first switch, and the other end of the third resistor is connected to the control end of the switch unit; one end of the fourth resistor is connected to the third resistor, and the other end of the fourth resistor is connected to the ground end of the first capacitor; Wherein, the third resistor is an adjustable resistor.

5. The common voltage compensation circuit according to claim 1, wherein: The common compensation voltage output control module includes a comparison unit, which is connected to the control terminal of the switch unit and the trigger, and obtains the voltage value of the gate drive signal of the display panel in real time, and calculates the voltage difference of the rising edge or the falling edge. If the voltage difference is less than the preset voltage difference of the rising edge or the falling edge of the gate drive signal, the switch unit is controlled to be turned on; If the voltage difference is greater than or equal to the preset voltage difference between the rising edge and the falling edge of the gate driving signal, the gate driving signal is output to the negative polarity input terminal of the trigger of the control signal generating unit.

6. The common voltage compensation circuit according to claim 2, wherein: The common voltage compensation circuit further includes a voltage stabilizing module, one end of which is connected between the output end of the switch unit and the common wiring in the display panel, and the other end of which is grounded.

7. A driving circuit, characterized in that: The common voltage compensation circuit comprises the common voltage compensation circuit according to any one of claims 1 to 6, wherein the driving circuit further comprises a timing control module, and the timing control module outputs a gate driving signal, a clock signal and a common voltage signal to the common voltage compensation circuit.

8. A display device, characterized in that: The display device includes a display panel and the driving circuit according to claim 7, wherein the driving circuit is configured to drive the display panel.

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