Common voltage compensation circuit, driving circuit and display device

Abstract

The invention discloses a common voltage compensation circuit, a driving circuit and a display device, and the common voltage compensation circuit is used for compensating the common voltage of a display panel, and comprises 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 according to a feedback voltage on a common voltage feedback line in the display panel and a preset common voltage; the common compensation voltage output control module generates a control signal according to a rising edge and / or a falling edge of a 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 a common voltage wire in the display panel. The accuracy of the common voltage feedback signal is ensured mainly according to the rising edge and / or the falling edge of the high-frequency signal, and the phenomena that the coupled common voltage feedback signal is output to the display panel after being amplified, common voltage offset is caused, and transverse grains are generated are avoided.

Description

Technical Field

[0001] The present application relates to the field of display technologies, 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 development of liquid crystal display technology, consumers have higher and higher requirements for the display effect of liquid crystal display panels. Among them, the display defect problems related to the common voltage (VCOM) are particularly prominent.

[0003] In order to solve the problem of the VCOM being coupled, so as to improve the display effect, LCD manufacturers often add a VCOM compensation circuit to collect the VCOM fluctuations in the panel, and then input them to an operational amplifier (OP). After being compensated by the OP, they are input to the panel again; the common voltage feedback signal (VCOM Feedback) needs to accurately collect the VCOM fluctuations in the panel. However, the internal wiring of the panel is complex and there are many high-frequency signals. It is precisely the existence of these high-frequency signals that will cause coupling to the VCOM Feedback signal. After being coupled, the VCOM Feedback signal is amplified and compensated by the operational amplifier (OP) and then output to the display panel, resulting in a VCOM offset in the display panel and generating a stripe defect phenomenon. 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 stripe defect caused by the common voltage offset.

[0005] The present application discloses a common voltage compensation circuit. The common voltage compensation circuit is used to compensate the common voltage of a display panel. The display panel is provided with a common voltage feedback line for feeding back the 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 according to 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, one end is connected to the common compensation voltage generation module, and the other end is connected to the common voltage wiring in the display panel, 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 wiring in the display panel.

[0006] Optionally, the common compensation voltage output control module includes a switching unit and a control signal generation unit. The switching unit is connected to the common compensation voltage generation module and is used to control the output of the common compensation voltage generated by the common compensation voltage generation module. The control signal generation unit acquires the high-frequency signal of the display panel and generates a control signal according to the rising edge and / or falling edge of the high-frequency signal, so as to output to the control end of the switching unit to control the switching unit to conduct or cut off, so that the common compensation voltage generation module outputs the common compensation voltage to the common voltage trace in the display panel.

[0007] Optionally, the high-frequency signal includes a gate driving signal, and the control signal generation unit includes a trigger, a first circuit, a second circuit, and a third circuit. The gate driving signal includes a first gate driving signal, and the first gate driving signal generates a second gate driving 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 driving signal, and the output port outputs the second gate driving signal to the first input ends of the first circuit, the second circuit, and the third circuit respectively. The second input ends of the first circuit, the second circuit, and the third circuit respectively receive the second gate driving signal. Among them, the first circuit includes an exclusive OR circuit, the second circuit and the third circuit include AND gate circuits. The first circuit generates a first control signal according to the rising edge or falling edge of the first gate driving signal and the second gate driving signal and outputs it to the control end of the switching unit. The second circuit generates a second control signal according to the falling edge of the first gate driving signal and the second gate driving signal and outputs it to the control end of the switching unit. The third circuit generates a third control signal according to the rising edge of the first gate driving signal and the second gate driving signal and outputs it to the control end of the switching unit.

[0008] Optionally, the common compensation voltage generation 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 the 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 switch unit, and the output terminal of the switch unit is connected to the common voltage trace in the display panel; the control terminal of the switch unit is connected to the control signal generation 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 switch unit includes a transistor or a triode.

[0009] Optionally, the common compensation voltage generation 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 the 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 trace 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 generation 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 switch unit includes a transistor or a triode.

[0010] Optionally, the common compensation voltage output control module further 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 grounded 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. The comparison unit is connected to the control end of the switch unit and the trigger, and obtains the voltage value of the gate driving 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 value of the preset rising edge or falling edge voltage difference of the gate driving signal, the switch unit is controlled to conduct; if the voltage difference is greater than or equal to the voltage value of the preset rising edge or falling edge voltage difference of the gate driving signal, the gate driving 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 trace in the display panel, and the other end of the voltage stabilizing module is grounded.

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

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

[0015] Compared with the solution of directly collecting the feedback signal to compensate the common voltage, the present application provides a common voltage compensation circuit, which generates a common compensation voltage according to the feedback voltage on the common voltage feedback line in the display panel and the preset common voltage; the common compensation voltage output control module 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 trace in the display panel. When the coupling of the rising edge and / or falling edge of the high-frequency signal to the common voltage feedback line is large, the route in the display panel where the common compensation voltage is input is disconnected. If the rising edge and / or falling edge of the high-frequency signal has no influence on the common voltage feedback line, the common compensation voltage is output to the common voltage trace in the display panel, thereby improving the large interference of the common compensation voltage caused by the large coupling of the common voltage feedback line, avoiding the VCOM Feedback signal after being coupled from passing through the common compensation voltage generation module for operation and amplification and then being output to the display panel, resulting in the VCOM offset in the display panel and generating the stripe defect phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings included herein are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, for illustrating the embodiments of the present application, and are used to explain the principle of the present application together with the text description. Obviously, the drawings in the following description 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 creative efforts. In the drawings: Figure 1 is a schematic structural diagram of the common voltage compensation circuit according to the first embodiment of the present application; Figure 2 is a schematic structural diagram of the common voltage compensation circuit according to the second embodiment of the present application; Figure 3 is a circuit diagram of the control signal generation unit according to the second embodiment of the present application; Figure 4 is a signal waveform diagram in the circuit of the control signal generation unit according to the second embodiment of the present application; Figure 5 is a circuit diagram of the common compensation voltage output according to the second embodiment of the present application; Figure 6 is another circuit diagram of the common compensation voltage output according to the second embodiment of the present application; Figure 7 is a circuit diagram of the common voltage compensation according to the third embodiment of the present application; Figure 8 is a circuit diagram of the common voltage compensation according to the fourth embodiment of the present application; Figure 9It is a schematic structural diagram of the common voltage compensation circuit according to the fifth embodiment of the present application; Figure 10 It is a schematic structural diagram of the common voltage compensation circuit according to the fifth embodiment of the present application; Figure 11 It is a schematic structural diagram of the driving circuit according to the sixth embodiment of the present application; Figure 12 It is a schematic structural diagram of the display device according to the seventh embodiment of the present application.

[0017] Among them, 100 is the common voltage compensation circuit; 110 is the common compensation voltage generation module; 120 is the common compensation voltage output control module; 121 is the switch unit; 122 is the control signal generation unit; 123 is the control signal adjustment unit; 124 is the comparison unit; 130 is the voltage stabilization module; 200 is the driving circuit; 210 is the timing control module; 300 is the display panel; 310 is the common voltage feedback line; 320 is the common voltage trace; 400 is the display device; OE is the control signal; OP is the operational amplifier; D1 is the flip-flop; A1 is the first circuit; A2 is the second circuit; A3 is the third circuit; the first resistor is R1; the second resistor is R2; the third resistor is R3; the fourth resistor is R4; the first capacitor is C1; the first switch is SW1. Detailed implementation manners

[0018] It should be understood that the terms, the specific structures and functional details disclosed herein are only for describing the specific embodiments, which are representative, but the present application can be specifically implemented in many alternative forms and should not be construed as being limited only to the embodiments set forth herein.

[0019] The present application will be described in detail below with reference to the accompanying drawings and optional embodiments.

[0020] Refer to Figure 1As shown, as the first embodiment of the present application, a common voltage compensation circuit 100 is disclosed. The common voltage compensation circuit 100 is used to compensate 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. One end of the common compensation voltage output control module 120 is connected to the common compensation voltage generation module 110, and the other end is connected to the common voltage trace 320 in the display panel 300. 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 trace 320 in the display panel 300.

[0021] In this embodiment, 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. However, it is not immediately output to the common voltage trace 320 in the display panel 300 after generation. Instead, it 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 high or low, the feedback voltage on the common voltage feedback line 310 is less disturbed, and the common compensation voltage generated by the common compensation voltage generation module 110 is relatively accurate and can be input to the common voltage trace 320 in the display panel 300 for display. When the high-frequency signal is at the rising edge or falling edge, that is, when the level switches, the feedback voltage on the common voltage feedback line 310 is greatly disturbed, and the common compensation voltage generated by controlling the common compensation voltage generation module 110 is not input to the common voltage trace 320 in the display panel 300, thereby shielding the interference to the VCOM compensation circuit caused by the high-frequency signal during the high and low level switching moment, and avoiding the common voltage feedback signal (VCOMFeedback) after being coupled from being output to the display panel 300 after being amplified by the operation of the common compensation voltage generation module 110, resulting in a VCOM offset in the display panel 300 and causing a stripe defect phenomenon.

[0022] Refer to Figure 2 As shown, as the second embodiment of the present application, it is a further refinement and improvement of the above first embodiment. Refer to Figures 2 to 6As shown, the common compensation voltage output control module 120 includes a switching unit 121 and a control signal generation unit 122. The switching unit 121 is connected to the common compensation voltage generation module 110 and is used to control the output of the common compensation voltage generated by the common compensation voltage generation module 110. The control signal generation unit 122 acquires 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, so as to output to the control end of the switching unit 121 to control the switching unit 121 to conduct or turn off, so that the common compensation voltage generation module 110 outputs the common compensation voltage to the common voltage trace 320 in the display panel 300. Among them, the high-frequency signal includes a gate driving signal, and the gate driving signal is a driving signal related to the Gate Driver Less (gate driver) technology, also known as the GDL signal, also called the cascaded driving signal.

[0023] Generally, the common compensation voltage output control module 120 is composed of two parts: a switching unit 121 and a control signal generation unit 122. The switching unit 121 includes a transistor (MOS) or a triode. The control signal generation unit 122 generates a control signal according to the rising edge and / or falling edge of the high-frequency signal, so as to output to the control end of the switching unit 121 to control the switching unit 121 to conduct or turn off. Here, the switching 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 also provided. Specifically, the common voltage compensation circuit 100 further includes a voltage stabilizing module 130. One end of the voltage stabilizing module 130 is connected between the output end of the switching 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. Through the voltage dividing effect of the resistor, the fluctuating part of the common compensation voltage output by the switching unit 121 is consumed in itself, so as to stably transmit the common compensation voltage to the display panel 300.

[0024] Further, taking the gate driving signal as an example of the high-frequency signal, the control signal generating unit 122 includes a flip-flop, a first circuit A1, a second circuit A2, and a third circuit A3; the gate driving signal includes a first gate driving signal, and the second gate driving signal is generated after the first gate driving signal is delayed by the flip-flop; the flip-flop 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 driving signal, and the output port outputs the second gate driving signal to the first input ends of the first circuit A1, the second circuit A2, and the third circuit A3 respectively, and the second input ends of the first circuit A1, the second circuit A2, and the third circuit A3 receive the second gate driving signal respectively; wherein, the first circuit A1 includes an exclusive-OR circuit, the second circuit A2 and the third circuit A3 include AND gate circuits, the first circuit A1 generates a first control signal according to the rising edge or the falling edge of the first gate driving signal and the second gate driving signal and outputs the first control signal to the control end of the switching unit 121, the second circuit A2 generates a second control signal according to the falling edge of the first gate driving signal and the second gate driving signal and outputs the second control signal to the control end of the switching unit 121, and the third circuit A3 generates a third control signal according to the rising edge of the first gate driving signal and the second gate driving signal and outputs the third control signal to the control end of the switching unit 121.

[0025] 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 a feedback voltage on the common voltage feedback line 310, 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 end of the switching unit 121, and the output end of the switching unit 121 is connected to the common voltage trace 320 in the display panel 300; the control end of the switching 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 to obtain a common voltage feedback signal (VCOM Feedback), the output end is connected to the negative input terminal 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 input end of the switching unit 121.

[0026] Specifically, Figure 3Circuit diagram of the control signal generation unit 122, which is used to obtain the rising edge, falling edge or both rising and falling edge information of the GDL signal. The GDL signal generally refers to the collective term of STV / CLK / LC in the LCD panel driving circuit 200. D1 is a D flip-flop, System_CLK is the clock signal, GDL following is the falling edge of the GDL signal, GDLrising is the rising edge of the GDL signal, and GDL rising and following are the rising and falling edges of GDL. After the GDL signal passes through the flip-flop D1, a GDL signal GDL_Delay delayed by 1 System_CLK is obtained, that is, it is converted from the first gate driving signal to the second gate driving signal. The first gate driving signal is represented by GDL, and the second gate driving signal is represented by GDL_Delay. Further, an inversion operation is performed on the second gate driving signal (GDL_Delay). After GDL_Delay is inverted, it is AND-operated with GDL through the third circuit A3 (A3 is an AND gate circuit) to obtain GDL_rising, that is, the rising edge information of the GDL signal. After GDL is inverted and AND-operated with GDL_Delay (A2 is an AND gate circuit), GDL_following, that is, the falling edge information of GDL, is obtained. After GDL and GDL_Delay are XOR-operated (A1 is an XOR circuit), GDL_rising&following, that is, the rising and falling edge information of GDL, is obtained. Figure 4 Output waveforms of various signals in the circuit of the control signal generation unit 122, so that the rising edge and falling edge information of the GDL signal can be obtained; Figure 3 Take GDL_rising or GDL_following or GDL_rising&following obtained above as the control signal OE to control Figure 5 or Figure 6 MOS transistors or triodes to turn on or off.

[0027] Similarly, Figure 5 Circuit diagram of the MOS transistor controlled by the OE signal to control the output of the common compensation voltage Figure 6 Circuit diagram of the triode controlled by the OE signal to control the output of the common compensation voltage; when the control signal OE is low, at this time, when GDL is continuously high or low, the MOS transistor or triode is normally turned on, and the operational amplifier (OP) normally outputs the compensated VCOM voltage to the in-plane. When OE is high, at this time, during the GDL high-low level switching period, the MOS transistor or triode 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 to the VCOM compensation circuit caused by the GDL high-low level switching moment.

[0028] ReferenceFigure 7 As shown, as the third embodiment of the present application, it is a further refinement and improvement of the above first embodiment. Different from the above second embodiment, with reference to Figure 3 , Figure 4 and Figure 7 As shown, the common compensation voltage generation 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 the feedback voltage on the common voltage feedback line 310, the power input terminal of the operational amplifier is connected to the power supply 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, the input terminal of the switch unit 121 is connected to the power supply voltage, and the control terminal of the switch unit 121 is connected to the control signal generation unit 122; the input terminal of the first resistor R1 is connected to the common voltage feedback line 310 in the display panel 300, 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 output terminal of the operational amplifier; wherein, the switch unit 121 includes a transistor or a triode; when OE is low, at this time it is the time when GDL is continuously high or low level, the MOS transistor is normally turned on, and the operational amplifier OP is normally powered, so the VCOM compensation circuit works normally; when OE is high, at this time it is the period when GDL switches between high and low levels, the MOS transistor is turned off, OP cannot be normally powered and thus does not work, and the VCOM compensation circuit does not work either.

[0029] With reference 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. With reference to Figure 3 , Figure 4 and Figure 8As shown, the common compensation voltage output control module 120 further includes a control signal adjustment unit 123. One end of the control signal adjustment unit 123 is respectively connected to the output ends of a first circuit A1, a second circuit A2, and a third circuit A3 through a 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, the other end of the first capacitor C1 is grounded, one end of the third resistor R3 is connected to the first switch SW1, 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 grounded end of the first capacitor C1. Among them, the third resistor R3 is an adjustable resistor.

[0030] In this embodiment, considering that 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 level before R3, and R3 is an adjustable resistor. The threshold can be adjusted by adjusting R3, and the adjustable range is 0% to 100%. The conduction of the MOS transistor in the switch unit 121 can be controlled according to the size of the fluctuation range to realize the output of the common compensation voltage.

[0031] Reference Figure 9 As shown, as the fifth embodiment of the present application, it is a further improvement on the above second embodiment or third embodiment. The common compensation voltage output control module 120 includes a comparison unit 124. 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 driving 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 value of the rising edge or the falling edge of the preset gate driving signal, the switch unit 121 is controlled to conduct; if the voltage difference is greater than or equal to the voltage difference value of the rising edge or the falling edge of the preset gate driving signal, the gate driving signal is output to the negative input terminal of the trigger of the control signal generation unit 122.

[0032] In this example, when the voltage difference between the rising edge and the falling edge of the gate driving signal is less than a preset threshold, the module conducts voltage compensation through the switching unit 121. This mechanism can effectively repair the signal edge slope problem caused by transmission loss, parasitic capacitance, or insufficient driving ability, ensure that the flip-flop receives a steep edge signal, and reduce the risk of mis-triggering. By monitoring the voltage difference in real time, the module can adapt to different working conditions (such as temperature change, panel aging, or long trace attenuation), dynamically adjust the compensation strategy, maintain signal integrity, and significantly improve the edge quality of the gate driving signal through an intelligent compensation mechanism, enhancing the stability of the display panel 300 under complex working conditions.

[0033] As shown in FIG. 11, as the sixth embodiment of the present application, a driving circuit 200 is disclosed, which includes the common voltage compensation circuit 100 described in any of the above embodiments. The driving circuit 200 further includes a timing control module 210, and the timing control module 210 outputs a gate driving signal, a clock signal, and a common voltage signal to the common voltage compensation circuit 100.

[0034] As shown in FIG. 12, as the seventh embodiment of the present application, a display device 400 is disclosed. The display device 400 includes a display panel 300 and a driving circuit 200. The driving circuit 200 includes the common voltage compensation circuit 100 described in any of the above. The common compensation voltage generation module 110 of the common voltage compensation circuit 100 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 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 trace 320 in the display panel 300, improving the problem of large interference of the common compensation voltage caused by large coupling of the common voltage feedback line 310, avoiding the VCOM Feedback signal after being coupled and then being amplified by the operational amplifier OP and output to the panel, resulting in the VCOM offset in the panel and generating the horizontal stripe defect phenomenon.

[0035] It should be noted that the inventive concept of the present application can form a very large number of embodiments. However, due to the limited space of the application documents, it is impossible to list them all. Therefore, on the premise of no conflict, the above-described embodiments or technical features can be combined arbitrarily to form new embodiments. After the combination of each embodiment or technical feature, the original technical effect will be enhanced.

[0036] The above content is a further detailed description of the present application in combination with specific optional embodiments. It cannot be determined that the specific implementation of the present application is only limited to these descriptions. For those of ordinary skill in the technical field to which the present application pertains, without departing from the concept of the present application, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present application.

Claims

1. A common voltage compensation circuit for compensating the common voltage of a display panel, the display panel being provided with a common voltage feedback line for feeding back the common voltage waveform, characterized in that, The common voltage compensation circuit includes: A common compensation voltage generation module that 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, with one end connected to the common compensation voltage generation module and the other end connected to a common voltage trace in the display panel, generates a control signal according to a rising edge and / or a falling edge of a 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 trace in the display panel.

2. The common voltage compensation circuit according to claim 1, wherein The common compensation voltage output control module includes: A switch unit, connected to the common compensation voltage generation module, for controlling the output of the common compensation voltage generated by the common compensation voltage generation module; and A control signal generation unit that acquires a high-frequency signal of the display panel and generates a control signal according to a rising edge and / or a falling edge of the high-frequency signal, and outputs the control signal to a control end of the switch unit to control the switch unit to be turned on or off, so that the common compensation voltage generation module outputs the common compensation voltage to the common voltage trace in the display panel.

3. The common voltage compensation circuit according to claim 2, characterized in that, The high-frequency signal includes a gate driving signal, and the control signal generation unit includes a trigger, a first circuit, a second circuit, and a third circuit; the gate driving signal includes a first gate driving signal, and the first gate driving signal generates a second gate driving 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 driving signal, and the output port outputs the second gate driving signal to first input ends of the first circuit, the second circuit, and the third circuit respectively. Second input ends of the first circuit, the second circuit, and the third circuit respectively receive the second gate driving signal; Wherein, the first circuit includes an exclusive OR circuit, the second circuit and the third circuit include AND gate circuits. The first circuit generates a first control signal according to a rising edge or a falling edge of the first gate driving signal and the second gate driving signal and outputs the first control signal to the control end of the switch unit. The second circuit generates a second control signal according to a falling edge of the first gate driving signal and the second gate driving signal and outputs the second control signal to the control end of the switch unit. The third circuit generates a third control signal according to a rising edge of the first gate driving signal and the second gate driving signal and outputs the third control signal to the control end of the switch unit.

4. The common voltage compensation circuit according to claim 2 or 3, characterized in that, The common compensation voltage generation 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 the 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. The output terminal of the switching unit is connected to the common voltage trace in the display panel. The control terminal of the switching unit is connected to the control signal generation 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 switching unit; Wherein, the switching unit includes a transistor or a triode.

5. The common voltage compensation circuit according to claim 2 or 3, characterized in that, The common compensation voltage generation 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 the common voltage feedback line. The power input terminal of the operational amplifier is connected to the power supply voltage through the switching unit. The ground terminal of the operational amplifier is grounded. The output terminal of the operational amplifier is connected to the common voltage trace in the display panel. The output terminal of the switching unit is connected to the power input terminal of the operational amplifier. The input terminal of the switching unit is connected to the power supply voltage. The control terminal of the switching unit is connected to the control signal generation 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.

6. The common voltage compensation circuit according to claim 3, wherein, The common compensation voltage output control module further includes a control signal adjustment unit. One end of the control signal adjustment unit is respectively connected to the output terminals of the first circuit, the second circuit, and the third circuit through a first switch, and the other end of the control signal adjustment unit is connected to the control terminal of the switching 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 terminal of the switching unit, and the other end is grounded. One end of the third resistor is connected to the first switch, and the other end is connected to the control terminal of the switching unit. One end of the fourth resistor is connected to the third resistor, and the other end is connected to the grounded end of the first capacitor; Wherein, the third resistor is an adjustable resistor.

7. The common voltage compensation circuit according to claim 3, wherein 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. It acquires the voltage value of the gate driving signal of the display panel in real time and calculates the voltage difference at the rising edge or the falling edge. If the voltage difference is less than the preset voltage difference value of the rising edge or the falling edge of the gate driving signal, it controls the switching unit to conduct; If the voltage difference is greater than or equal to the preset voltage difference value of the rising edge or the falling edge of the gate driving signal, it outputs the gate driving signal to the negative input terminal of the trigger of the control signal generation unit.

8. The common voltage compensation circuit according to claim 4, characterized in that, The common voltage compensation circuit further includes a voltage stabilization module. One end of the voltage stabilization module is connected between the output end of the switching unit and the common wiring in the display panel, and the other end of the voltage stabilization module is grounded.

9. A driving circuit, characterized in that, Including the common voltage compensation circuit according to any one of claims 1-8, the driving circuit further includes a timing control module, which outputs a gate driving signal, a clock signal and a common voltage signal to the common voltage compensation circuit.

10. A display device, characterized in that, The display device includes a display panel and the driving circuit according to claim 9, and the driving circuit is used to drive the display panel.

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