Gamma voltage compensation circuit, compensation method, and display device

Abstract

This application belongs to the field of displays and relates to a gamma voltage compensation circuit, compensation method, and display device. The gamma voltage compensation circuit includes an input module, a rectifier module, a compensation module, and an output module. The input module receives a base gamma voltage, the rectifier module converts the signal of the frame start signal line into a reference voltage, the compensation module generates a gamma compensation voltage based on the reference voltage, and the output module generates a target gamma voltage by superimposing the base gamma voltage and the gamma compensation voltage, which is output to the data drive chip of the display panel. The differential voltage between the target gamma voltage and the common voltage has a negative correlation with the reference voltage. When the refresh rate is high, the gamma voltage compensation circuit reduces the differential voltage between the target gamma voltage and the common voltage, lowering the brightness of the display screen. When the refresh rate is low, the gamma voltage compensation circuit increases the differential voltage between the target gamma voltage and the common voltage, improving the brightness of the display screen and reducing or eliminating flickering of the display screen.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on April 18, 2023, with the application number CN202310413304.X and the application title "Gamma Voltage Compensation Circuit, Compensation Method, and Display Device", and the entire content thereof is incorporated herein by reference.

[0002] This application belongs to the display field, and particularly relates to a gamma voltage compensation circuit, a compensation method, and a display device.

Background Art

[0003] The variable refresh rate (VRR) mode can realize a refresh display on a display screen at a frequency of 48 Hz to 144 Hz, and can make the refresh rate of the screen match the display screen in real time, thereby avoiding stuttering and tearing of the display screen at different frequencies.

[0004] When the refresh rate of the display screen is switched in real time, the V-blank regions at different refresh rates are different, and the leakage power of the transistor is different. The lower the refresh rate, the longer the V-blank region and the more the leakage power of the transistor. The higher the refresh rate, the shorter the V-blank region and the less the leakage power of the transistor. Since the transistor is connected to the pixel electrode, when the leakage power of the transistor is different, the voltage of the pixel electrode is also different. Therefore, even when the gamma voltage is the same, when the refresh rate of the display screen is switched in real time, the voltage of the pixel electrode becomes unstable, and there is a difference in the brightness of the display screen, resulting in visible flicker on the display screen.

Summary of the Invention

Means for Solving the Problems

[0005] This application provides a gamma voltage compensation circuit, compensation method, and display device that reduce flickering of a display screen by compensating the gamma voltage based on the refresh rate of the display screen.

[0006] According to a first aspect of the present application, the present application provides a voltage compensation circuit, which is connected to a gamma chip and includes an input module for inputting a base gamma voltage. The gamma voltage compensation circuit described above is A rectifier module connected to the frame start signal line and for converting the signal from the frame start signal line into a reference voltage, A compensation module connected to the rectifier module for generating a gamma compensation voltage based on the reference voltage, The system further includes an output module connected to the input module, the compensation module, and the display panel, which generates a target gamma voltage by superimposing the base gamma voltage and the gamma compensation voltage, and outputs it to the data drive chip of the display panel. The differential voltage between the target gamma voltage and the common voltage has a negative correlation with the reference voltage.

[0007] According to a second aspect of the present application, the present application further provides a gamma voltage compensation method, The gamma voltage compensation method described above is: A step of generating a base gamma voltage in the light state using a gamma chip, The steps include: compensating the base gamma voltage with a gamma voltage compensation circuit to obtain a target gamma voltage; The process includes the step of compensating for the gamma band point voltage based on the target gamma voltage and a preset gamma curve.

[0008] According to a third aspect of the present application, the present application further provides a display device comprising a gamma voltage compensation circuit, a gamma chip, and a display panel, wherein the gamma voltage compensation circuit is connected to the gamma chip and the display panel.

[0009] The gamma voltage compensation circuit, compensation method, and display device of the present invention have the following beneficial effects.

[0010] In this application, the rectifier module is connected to the frame start signal line and converts the frame start signal into a reference voltage, which has a positive correlation with the refresh rate; the compensation module is connected to the rectifier module and generates a gamma compensation voltage based on the reference voltage; the input module is connected to the gamma chip and receives the base gamma voltage as input; and the output module is connected to the input module, the compensation module, and the display panel and generates a target gamma voltage by superimposing the base gamma voltage and the gamma compensation voltage, and outputs it to the data drive chip of the display panel, with the differential voltage between the target gamma voltage and the common voltage having a negative correlation with the reference voltage. When the refresh rate is high, the gamma voltage compensation circuit lowers the differential voltage between the target gamma voltage and the common voltage, reducing the brightness of the display screen; when the refresh rate is low, the gamma voltage compensation circuit raises the differential voltage between the target gamma voltage and the common voltage, improving the brightness of the display screen and reducing or eliminating flickering of the display screen.

[0011] Other features and merits of this application will become clear from the detailed description below, or some will be obtained through the practice of this application.

[0012] The general descriptions above and the detailed descriptions below are merely illustrative and interpretive and do not limit the present invention.

[0013] The drawings herein, incorporated into the specification, constitute part of this specification, illustrate suitable embodiments for the present application, and are intended to interpret the principles of the present application together with the specification. Note that the drawings in the following description represent only some embodiments of the present application, and those skilled in the art can obtain other drawings from these without requiring any creative work. [Brief explanation of the drawing]

[0014] [Figure 1]This is a block diagram showing the structure of the gamma voltage compensation circuit in Embodiment 1 of the present application. [Figure 2] This is a schematic diagram showing frame start signals of different frequencies in Embodiment 1 of the present invention. [Figure 3] This is a schematic diagram showing the gamma voltage compensation circuit in Embodiment 1 of the present invention. [Figure 4] This is a flowchart illustrating the gamma voltage compensation method in Embodiment 2 of the present invention. [Figure 5] This is a schematic diagram showing the structure of the display device in Embodiment 3 of the present invention. [Modes for carrying out the invention]

[0015] Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. However, exemplary embodiments can be carried out in multiple forms and are not limited to the embodiments described herein. Conversely, these embodiments are provided to make the present application complete and to fully convey the idea of ​​the exemplary embodiments to those skilled in the art.

[0016] Furthermore, the features, configurations, or characteristics described can be combined in one or more embodiments in any suitable manner. The following description provides many specific details so that the embodiments relating to this application may be fully understood. However, it should be understood that the technical proposal relating to this application can be realized without one or more of the specific details, or other methods, components, apparatus, steps, etc., can be employed. In other cases, known methods, apparatus, implementations, or operations are not described or shown in detail so as not to obscure the embodiments of this application.

[0017] The present application will be further described below with reference to the drawings and specific embodiments. The technical features of each embodiment of the present application described below can be combined with each other, provided they do not contradict each other. The embodiments described below with reference to the drawings are illustrative for interpreting the present application and should not be understood as limiting the present application.

[0018] Example 1 Referring to FIG. 1, in this embodiment, the gamma voltage compensation circuit includes an input module 110, a rectification module 130, a compensation module 150, and an output module 160.

[0019] When the refresh rates are different, the duty ratios of the frame start signal STV are different. The higher the refresh rate, the larger the duty ratio of the frame start signal STV, and the lower the refresh rate, the smaller the duty ratio of the frame start signal STV. For example, as shown in FIG. 2, when the refresh rate is 48 Hz, the duty ratio of the frame start signal STV becomes relatively small. When the refresh rate is 144 Hz, the duty ratio of the frame start signal STV becomes relatively large. The rectification module 130 is connected to the frame start signal line 171, and the frame start signal line 171 outputs the frame start signal STV. The rectification module 130 is for converting the frame start signal STV into a reference voltage Vref. The higher the refresh rate, the higher the reference voltage Vref converted by the rectification module 130, and the lower the refresh rate, the lower the reference voltage Vref converted by the rectification module 130.

[0020] The compensation module 150 is connected to the rectification module 130 and is for generating a gamma compensation voltage based on the reference voltage Vref. The input module 110 is connected to the gamma chip and is for inputting a base gamma voltage. The output module 160 is connected to the input module 110, the compensation module 150, and the display panel 200, and is for superimposing the base gamma voltage and the gamma compensation voltage to generate a target gamma voltage and outputting it to the data driving chip (source driver) of the display panel 200.

[0021] The differential pressure between the target gamma voltage and the common voltage Vcom has a negative correlation with the reference voltage Vref. That is, the higher the reference voltage Vref, the lower the differential pressure between the target gamma voltage and the common voltage Vcom, and the lower the reference voltage Vref, the higher the differential pressure between the gamma compensation voltage and the common voltage Vcom. Since the differential pressure between the target gamma voltage and the common voltage Vcom affects the luminance of the display panel 200, the higher the differential pressure between the target gamma voltage and the common voltage Vcom, the higher the luminance of the display panel. The lower the differential pressure between the target gamma voltage and the common voltage Vcom, the lower the luminance of the display panel.

[0022] As described above, the higher the refresh rate, the higher the reference voltage Vref converted by the rectification module 130, the lower the differential pressure between the target gamma voltage and the common voltage Vcom, and the lower the luminance of the display panel. The lower the refresh rate, the lower the reference voltage Vref converted by the rectification module 130, the higher the differential pressure between the target gamma voltage and the common voltage Vcom, and the higher the luminance of the display panel.

[0023] The variable refresh rate mode can enable the display panel 200 to realize a refresh display at a frequency of 48 Hz to 144 Hz. The higher the refresh rate, the lower the leakage power of the transistor, and the higher the luminance of the display screen. The lower the refresh rate, the higher the leakage power of the transistor, and the lower the luminance of the display screen. That is, when the refresh rate of the display panel 200 is switched, a flicker visible to the naked eye occurs on the display screen.

[0024] In this embodiment, the rectifier module 130 is connected to the frame start signal line 171 and converts the frame start signal STV into a reference voltage Vref, the reference voltage Vref having a positive correlation with the refresh rate; the compensation module 150 is connected to the rectifier module 130 and generates a gamma compensation voltage based on the reference voltage Vref; the input module 110 is connected to the gamma chip and receives the base gamma voltage as input; and the output module 160 is connected to the input module 110, the compensation module 150, and the display panel 200 and generates a target gamma voltage by superimposing the base gamma voltage and the gamma compensation voltage, and outputs it to the data drive chip of the display panel 200, the differential voltage between the target gamma voltage and the common voltage Vcom having a negative correlation with the reference voltage Vref. When the refresh rate is high, the gamma voltage compensation circuit reduces the differential pressure between the target gamma voltage and the common voltage Vcom, thereby lowering the brightness of the display screen. When the refresh rate is low, the gamma voltage compensation circuit increases the differential pressure between the target gamma voltage and the common voltage Vcom, thereby improving the brightness of the display screen and reducing or eliminating screen flicker.

[0025] Referring to Figures 1 to 3, the input module 110 includes a first input line 111 and a second input line 112. The compensation module 150 includes a first compensation module 151 and a second compensation module 152, and the output module 160 includes a first output module 161 and a second output module 162. The first compensation module 151 is connected to the first input line 111 and the first output module 161, and the second compensation module 152 is connected to the second input line 112 and the second output module 162.

[0026] The base gamma voltage includes a positive base gamma voltage UH1 and a negative base gamma voltage LL1. When the gamma voltage is higher than the common voltage Vcom, the gamma voltage is the positive base gamma voltage UH1. When the gamma voltage is lower than the common voltage Vcom, the gamma voltage is the negative base gamma voltage LL1.

[0027] The first input line 111 is for inputting a positive base-gamma voltage UH1 to the first output module 161, and the second input line 112 is for inputting a negative base-gamma voltage LL1 to the second output module 162.

[0028] When the refresh rate is high, the reference voltage Vref output from the rectifier module 130 is high, so the first compensation module 151 outputs a low positive polarity compensation voltage UH2 based on the reference voltage Vref, and the second compensation module 152 outputs a high negative polarity compensation voltage LL2 based on the reference voltage Vref. The positive polarity base gamma voltage UH1 and the positive polarity compensation voltage UH2 are superimposed to generate the positive polarity target gamma voltage UH0, and the negative polarity base gamma voltage LL1 and the negative polarity compensation voltage LL2 are superimposed to generate the negative polarity target gamma voltage LL0. Whether the target gamma voltage is the positive polarity target gamma voltage UH0 or the negative polarity target gamma voltage LL0, the differential voltage between it and the common voltage Vcom is reduced, thereby lowering the brightness of the display screen.

[0029] In response to this, when the refresh rate is low, the reference voltage Vref output from the rectifier module 130 is low, so the first compensation module 151 outputs a high positive polarity compensation voltage UH2 based on the reference voltage Vref, and the second compensation module 152 outputs a low negative polarity compensation voltage LL2 based on the reference voltage Vref. Whether the target gamma voltage is a positive polarity target gamma voltage UH0 or a negative polarity target gamma voltage LL0, the differential voltage between it and the common voltage Vcom is increased to improve the brightness of the display screen.

[0030] When the refresh rate is high, the gamma voltage compensation circuit reduces the differential voltage between the target gamma voltage and the common voltage Vcom, thereby reducing the high brightness of the display screen caused by low transistor leakage power. When the refresh rate is low, the gamma voltage compensation circuit increases the differential voltage between the target gamma voltage and the common voltage Vcom, improving the low brightness of the display screen caused by high transistor leakage power, and reducing or eliminating display screen flicker.

[0031] Illustratively, referring to Figure 3, the first compensation module 151 includes a first operational amplifier 1511, a first resistor 1512, and a second resistor 1513. The first operational amplifier 1511 has a non-inverting input terminal, an inverting input terminal, and an output terminal. The inverting input terminal of the first operational amplifier 1511 is connected to the rectifier module 130 via the first resistor 1512. The inverting input terminal and output terminal of the first operational amplifier 1511 are connected via the second resistor 1513. The non-inverting input terminal of the first operational amplifier 1511 is grounded.

[0032] When the refresh rate is high, the reference voltage Vref output from the rectifier module 130 is high, so the first operational amplifier 1511 outputs a low positive polarity compensation voltage UH2 based on the reference voltage Vref, reducing the high brightness of the display screen due to low transistor leakage power. When the refresh rate is low, the reference voltage Vref output from the rectifier module 130 is low, so the first operational amplifier 1511 outputs a high positive polarity compensation voltage UH2 based on the reference voltage Vref, improving the low brightness of the display screen due to high transistor leakage power.

[0033] Referring to Figure 3, the second compensation module 152 includes a second operational amplifier 1521, a third resistor 1522, and a fourth resistor 1523. The second operational amplifier 1521 has a non-inverting input terminal, an inverting input terminal, and an output terminal. The inverting input terminal of the second operational amplifier 1521 is grounded via the third resistor 1522, the inverting input terminal and output terminal of the second operational amplifier 1521 are connected via the fourth resistor 1523, and the non-inverting input terminal of the second operational amplifier 1521 is connected to the rectifier module 130.

[0034] When the refresh rate is high, the reference voltage Vref output from the rectifier module 130 is high, so the second operational amplifier 1521 outputs a high negative polarity compensation voltage LL2 based on the reference voltage Vref, reducing the brightness of the display screen, which is high due to low transistor leakage power. When the refresh rate is low, the reference voltage Vref output from the rectifier module 130 is low, so the second operational amplifier 1521 outputs a low negative polarity compensation voltage LL2 based on the reference voltage Vref, reducing the brightness of the display screen, which is low due to high transistor leakage power.

[0035] Referring to Figure 3, the first output module 161 includes a third operational amplifier 1611, a fifth resistor 1612, a sixth resistor 1613, a seventh resistor 1614, an eighth resistor 1615, and a ninth resistor 1616. The third operational amplifier 1611 has a non-inverting input terminal, an inverting input terminal and an output terminal. The inverting input terminal of the third operational amplifier 1611 is grounded via a fifth resistor 1612. The inverting input terminal and output terminal of the third operational amplifier 1611 are connected via a sixth resistor 1613. The non-inverting input terminal of the third operational amplifier 1611 is connected to the first compensation module 151 via a seventh resistor 1614, specifically to the output terminal of the first operational amplifier 1511. The non-inverting input terminal of the third operational amplifier 1611 is connected to the first input line 111 via an eighth resistor 1615. The non-inverting input terminal of the third operational amplifier 1611 is grounded via a ninth resistor 1616.

[0036] Specifically, the positive polarity base gamma voltage UH1 output from the first input line 111 and the positive polarity compensation voltage UH2 output from the first operational amplifier 1511 are superimposed to generate the positive polarity target gamma voltage UH0.

[0037] When the refresh rate is high, the first operational amplifier 1511 outputs a low positive polarity compensation voltage UH2, and superimposes the low positive polarity compensation voltage UH2 with the positive polarity base gamma voltage UH1 to generate a low positive polarity target gamma voltage UH0, thereby reducing the high brightness of the display screen caused by low transistor leakage power. When the refresh rate is low, the first operational amplifier 1511 outputs a high positive polarity compensation voltage UH2, and superimposes the high positive polarity compensation voltage UH2 with the positive polarity base gamma voltage UH1 to generate a high positive polarity target gamma voltage UH0, thereby improving the low brightness of the display screen caused by high transistor leakage power.

[0038] Referring to Figure 3, the second output module 162 includes a fourth operational amplifier 1621, a tenth resistor 1622, an eleventh resistor 1623, a twelfth resistor 1624, a thirteenth resistor 1625, and a fourteenth resistor 1626. The fourth operational amplifier 1621 has a non-inverting input terminal, an inverting input terminal, and an output terminal. The inverting input terminal of the fourth operational amplifier 1621 is grounded via the tenth resistor 1622, and the inverting input terminal and output terminal of the fourth operational amplifier 1621 are connected. The terminals are connected via the 11th resistor 1623, the non-inverting input terminal of the 4th operational amplifier 1621 is connected via the 12th resistor 1624 to the 2nd compensation module 152, specifically to the output terminal of the 2nd operational amplifier 1521, the non-inverting input terminal of the 4th operational amplifier 1621 is connected via the 13th resistor 1625 to the 2nd input line 112, and the non-inverting input terminal of the 4th operational amplifier 1621 is grounded via the 14th resistor 1626.

[0039] Specifically, the negative polarity base gamma voltage LL1 output from the second input line 112 and the negative polarity compensation voltage LL2 output from the second operational amplifier 1521 are superimposed to generate the negative polarity target gamma voltage LL0.

[0040] When the refresh rate is high, the second operational amplifier 1521 outputs a high negative polarity compensation voltage LL2, and by superimposing the high negative polarity compensation voltage LL2 and the negative polarity base gamma voltage LL1, generates a high negative polarity target gamma voltage LL0, thereby reducing the high brightness of the display screen caused by low transistor leakage power. When the refresh rate is low, the second operational amplifier 1521 outputs a low negative polarity compensation voltage LL2, and by superimposing the low negative polarity compensation voltage LL2 and the negative polarity base gamma voltage LL1, generates a low negative polarity target gamma voltage LL0, thereby improving the low brightness of the display screen caused by high transistor leakage power.

[0041] Referring to Figure 3, the rectifier module 130 includes a diode 131, the positive terminal of which is connected to the frame start signal line 171, and the negative terminal of which is connected to the first compensation module 151 and the second compensation module 152. The first resistor 1512 of the first compensation module 151 is connected to the negative terminal of the diode 131, and the non-inverting input terminal of the second operational amplifier 1521 of the second compensation module 152 is connected to the negative terminal of the diode 131.

[0042] The frame start signal STV on the frame start signal line 171 is an AC signal, and the diode 131 can convert the AC signal into a DC signal and output it to the first compensation module 151 and the second compensation module 152.

[0043] The rectifier module 130 may include a diode 131, but is not limited to this, and may further include a bridge rectifier circuit or the like, depending on the circumstances.

[0044] Referring to Figure 3, the gamma voltage compensation circuit further includes a constant voltage module 140, which includes a 15th resistor 141, a 16th resistor 142, and a constant voltage capacitor 143. The first compensation module 151 and the second compensation module 152 are connected via a first node 172, the 15th resistor 141 is connected to the first node 172 and diode 131, the first node 172 is grounded via the 16th resistor 142, and the first node 172 is also grounded via the constant voltage capacitor 143.

[0045] The frame start signal STV on the frame start signal line 171 is an AC signal, and the diode 131 can convert the AC signal into a DC signal (i.e., a reference voltage Vref) and output it to the constant voltage module 140. The constant voltage module 140 reduces fluctuations in the reference voltage Vref and can output the reference voltage Vref to the first compensation module 151 and the second compensation module 152.

[0046] Referring to Figure 3, the gamma voltage compensation circuit further includes a voltage divider module 120, which includes a 17th resistor 121 and an 18th resistor 122, the 17th resistor 121 being connected to the frame start signal line 171 and diode 131, and a second node 173 between the 17th resistor 121 and diode 131 being grounded via the 18th resistor 122.

[0047] The voltage divider module 120 includes a 17th resistor 121 and an 18th resistor 122, and the voltage value of the reference voltage Vref can be adjusted by the voltage division of the 17th resistor 121 and the 18th resistor 122.

[0048] Example 2 Referring to Figure 4, in this embodiment, the gamma voltage compensation method includes the following steps. S100: The gamma chip generates the base gamma voltage in the light state. S200: The base gamma voltage is compensated by the gamma voltage compensation circuit to obtain the target gamma voltage. S300: Compensates for the gamma band point voltage based on the target gamma voltage and a preset gamma curve.

[0049] The brightness of the display screen is represented in gradations. Taking the 256 gradations of an 8-bit display panel 200 as an example, the gamma chip provides gamma band point voltages corresponding to 0 gradations (G7, G8), 31 gradations (G6, G9), 63 gradations (G5, G10), 127 gradations (G4, G11), 191 gradations (G3, G12), 223 gradations (G2, G13), and 255 gradations (G1, G14). The gamma voltages corresponding to the remaining 249 gradations are generated by voltage division within the data drive chip using the above seven sets of gamma band point voltages.

[0050] The input module 110 is connected to the gamma chip and is for inputting the base gamma voltage, which includes the base gamma voltage in the bright state, i.e., the gamma band point voltages (G1, G14) corresponding to 255 gradations. The compensation module 150 generates a gamma compensation voltage based on the reference voltage Vref, and generates a target gamma voltage by superimposing the base gamma voltage and the gamma compensation voltage, and outputs it to the data drive chip of the display panel 200. The gamma curve pre-set in the data drive chip is a curve that satisfies gamma 2.2, and the remaining gamma band point voltages compensated based on the pre-set gamma curve can be obtained.

[0051] The base gamma voltage may include, but is not limited to, the base gamma voltage in the light state; in some cases, the base gamma voltage may be the remaining gamma band point voltage.

[0052] In this embodiment, the gamma chip generates a base gamma voltage in the bright state, the input module 110 is connected to the gamma chip and is used to input the base gamma voltage, the compensation module 150 generates a gamma compensation voltage based on a reference voltage Vref, and generates a target gamma voltage by superimposing the base gamma voltage and the gamma compensation voltage, which is output to the data drive chip of the display panel 200, and the differential pressure between the target gamma voltage and the common voltage Vcom has a negative correlation with the reference voltage Vref. When the refresh rate is high, the gamma voltage compensation circuit lowers the differential pressure between the target gamma voltage and the common voltage Vcom, reducing the brightness of the display screen, and when the refresh rate is low, the gamma voltage compensation circuit raises the differential pressure between the target gamma voltage and the common voltage Vcom, improving the brightness of the display screen and reducing or eliminating flickering of the display screen.

[0053] Example 3 Referring to Figure 5, in this embodiment, the display device includes a voltage compensation circuit, a gamma chip, and a display panel 200. The gamma voltage compensation circuit is connected to the gamma chip and the display panel 200, and the gamma voltage compensation circuit includes the gamma voltage compensation circuit in Embodiment 1.

[0054] In this embodiment, the display device includes a gamma voltage compensation circuit, in which a rectifier module 130 is connected to the frame start signal line 171 and converts the frame start signal STV into a reference voltage Vref, the reference voltage Vref having a positive correlation with the refresh rate; a compensation module 150 is connected to the rectifier module 130 and generates a gamma compensation voltage based on the reference voltage Vref; an input module 110 is connected to the gamma chip and receives the base gamma voltage as input; and an output module 160 is connected to the input module 110, the compensation module 150, and the display panel 200 and generates a target gamma voltage by superimposing the base gamma voltage and the gamma compensation voltage, and outputs it to the data drive chip of the display panel 200, the differential voltage between the target gamma voltage and the common voltage Vcom having a negative correlation with the reference voltage Vref. When the refresh rate is high, the gamma voltage compensation circuit reduces the differential pressure between the target gamma voltage and the common voltage Vcom, thereby lowering the brightness of the display screen. When the refresh rate is low, the gamma voltage compensation circuit increases the differential pressure between the target gamma voltage and the common voltage Vcom, thereby improving the brightness of the display screen and reducing or eliminating screen flicker.

[0055] Referring to Figure 5, the display device further includes a motherboard 300 and a horizontal circuit board 100, the horizontal circuit board 100 being connected to the display panel 200 and the motherboard 300, the gamma chip being provided on the motherboard 300 and the gamma voltage compensation circuit being provided on the horizontal circuit board 100.

[0056] The gamma voltage compensation circuit is provided on a horizontal circuit board 100 and compensates the base gamma voltage via a hardware circuit. Compared to a method that compensates the base gamma voltage via a software circuit, this reduces the computational load on the timing controller and improves the delay of the timing controller's call code.

[0057] The terms "first," "second," etc., are used solely for explanatory purposes and should not be understood as indicating or implying relative importance, or implicitly pointing out the number of designated technical features. Thus, features designated as "first," "second," etc., may explicitly or implicitly include one or more of those features. In the description of this application, "multiple" means two or more unless otherwise specifically limited.

[0058] In this application, unless otherwise explicitly stated or limited, terms such as “assembly” and “connection” should be understood in a broad sense. For example, this could be a fixed connection, a detachable connection, or an integral connection. It could be a mechanical connection or an electrical connection. It could be a direct connection, an indirect connection via an intermediate medium, an internal communication between two elements, or an interaction relationship between two elements. A person skilled in the art will be able to understand the specific definitions of the above terms in this application depending on the specific circumstances.

[0059] In this specification, the terms “several examples” and “exemplary” mean that any particular feature, structure, material, or characteristic described in relation to this example is included in at least one example of the present application. In this specification, the exemplary expressions of the above terms do not necessarily apply to the same example. Furthermore, any particular feature, structure, material, or characteristic described may be combined in an appropriate manner in any one or more examples. Furthermore, a person skilled in the art can combine or link different examples and features of different examples described herein without contradiction.

[0060] Although embodiments of the present application have been described above, these embodiments are illustrative and should not be understood as limitations of the present application. Those skilled in the art can modify, alter, substitute, and transform the above embodiments within the scope of the present application. Therefore, any changes or modifications based on the claims and specification of the present application should fall within the scope of the present invention. [Explanation of symbols]

[0061] 100, horizontal circuit board; 110, input module; 111, first input line; 112, second input line; 120, voltage divider module; 121, 17th resistor; 122, 18th resistor; 130. Rectifier module; 131. Diode; 140, constant voltage module; 141, 15th resistor; 142, 16th resistor; 143, constant voltage capacitor; 150, compensation module; 151, first compensation module; 1511, first operational amplifier; 1512, first resistor; 1513, second resistor; 152, second compensation module; 1521, second operational amplifier; 1522, third resistor; 1523, fourth resistor; 160, Output module; 161, First output module; 1611, Third operational amplifier; 1612, Fifth resistor; 1613, Sixth resistor; 1614, Seventh resistor; 1615, Eighth resistor; 1616, Ninth resistor; 162, Second output module; 1621, Fourth operational amplifier; 1622, Tenth resistor; 1623, Eleventh resistor; 1624, Twelfth resistor; 1625, Thirteenth resistor; 1626, Fourteenth resistor; 171, frame start signal line; 172, first node; 173, second node; 200, display panel; 300, motherboard.

Claims

1. A gamma voltage compensation circuit, which is connected to a gamma chip and includes an input module for inputting a base gamma voltage, The gamma voltage compensation circuit described above is A rectifier module connected to the frame start signal line and for converting the signal from the frame start signal line into a reference voltage, A compensation module connected to the rectifier module for generating a gamma compensation voltage based on the reference voltage, The system further includes an output module connected to the input module, the compensation module, and the display panel, which generates a target gamma voltage by superimposing the base gamma voltage and the gamma compensation voltage, and outputs it to the data drive chip of the display panel. The differential voltage between the target gamma voltage and the common voltage has a negative correlation with the reference voltage. Gamma voltage compensation circuit.

2. The input module includes a first input line and a second input line, the compensation module includes a first compensation module and a second compensation module, the output module includes a first output module and a second output module, the first compensation module is connected to the first input line and the first output module, and the second compensation module is connected to the second input line and the second output module. The base gamma voltage includes a positive base gamma voltage and a negative base gamma voltage, the first input line is for inputting the positive base gamma voltage to the first output module, and the second input line is for inputting the negative base gamma voltage to the second output module. The gamma voltage compensation circuit according to claim 1.

3. The first compensation module includes a first operational amplifier, a first resistor, and a second resistor, wherein the first operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the first operational amplifier is connected to the rectifier module via the first resistor, the inverting input terminal and the output terminal of the first operational amplifier are connected via the second resistor, and the non-inverting input terminal of the first operational amplifier is grounded. The second compensation module includes a second operational amplifier, a third resistor, and a fourth resistor, wherein the second operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the second operational amplifier is grounded via the third resistor, the inverting input terminal and output terminal of the second operational amplifier are connected via the fourth resistor, and the non-inverting input terminal of the second operational amplifier is connected to the rectifier module. The gamma voltage compensation circuit according to claim 2.

4. The first output module includes a third operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor, wherein the third operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the third operational amplifier is grounded via the fifth resistor, the inverting input terminal and output terminal of the third operational amplifier are connected via the sixth resistor, the non-inverting input terminal of the third operational amplifier is connected to the first compensation module via the seventh resistor, the non-inverting input terminal of the third operational amplifier is connected to the first input line via the eighth resistor, and the non-inverting input terminal of the third operational amplifier is grounded via the ninth resistor. The second output module includes a fourth operational amplifier, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor, wherein the fourth operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the fourth operational amplifier is grounded via the tenth resistor, the inverting input terminal and output terminal of the fourth operational amplifier are connected via the eleventh resistor, the non-inverting input terminal of the fourth operational amplifier is connected to the second compensation module via the twelfth resistor, the non-inverting input terminal of the fourth operational amplifier is connected to the second input line via the thirteenth resistor, and the non-inverting input terminal of the fourth operational amplifier is grounded via the fourteenth resistor. The gamma voltage compensation circuit according to claim 2.

5. The rectifier module includes a diode, the positive terminal of which is connected to the frame start signal line, and the negative terminal of which is connected to the first compensation module and the second compensation module. The gamma voltage compensation circuit according to claim 2.

6. The gamma voltage compensation circuit further includes a constant voltage module, the constant voltage module includes a 15th resistor, a 16th resistor, and a constant voltage capacitor, the first compensation module and the second compensation module are connected via a first node, the 15th resistor is connected to the first node and the diode, the first node is grounded via the 16th resistor, and the first node is also grounded via the constant voltage capacitor. The gamma voltage compensation circuit according to claim 5.

7. The gamma voltage compensation circuit further includes a voltage divider module, the voltage divider module includes a 17th resistor and a 18th resistor, the 17th resistor being connected to the frame start signal line and the diode, and the second node between the 17th resistor and the diode being grounded via the 18th resistor. The gamma voltage compensation circuit according to claim 6.

8. The signal on the frame start signal line is an AC signal, and the reference voltage is a DC signal. The gamma voltage compensation circuit according to claim 1.

9. A step of generating a base gamma voltage in the light state using a gamma chip, The steps include: compensating the base gamma voltage with a gamma voltage compensation circuit to obtain a target gamma voltage; The step includes compensating for the gamma band point voltage based on the target gamma voltage and a preset gamma curve, The gamma voltage compensation circuit described above is An input module connected to the aforementioned gamma chip for inputting the base gamma voltage, A rectifier module connected to the frame start signal line and for converting the signal from the frame start signal line into a reference voltage, A compensation module connected to the rectifier module for generating a gamma compensation voltage based on the reference voltage, The input module, the compensation module, and the display panel are connected to an output module that generates a target gamma voltage by superimposing the base gamma voltage and the gamma compensation voltage, and outputs it to the data drive chip of the display panel. The differential voltage between the target gamma voltage and the common voltage has a negative correlation with the reference voltage. Gamma voltage compensation method.

10. The input module includes a first input line and a second input line, the compensation module includes a first compensation module and a second compensation module, the output module includes a first output module and a second output module, the first compensation module is connected to the first input line and the first output module, and the second compensation module is connected to the second input line and the second output module. The base gamma voltage includes a positive base gamma voltage and a negative base gamma voltage, the first input line is for inputting the positive base gamma voltage to the first output module, and the second input line is for inputting the negative base gamma voltage to the second output module. The gamma voltage compensation method according to claim 9.

11. The first compensation module includes a first operational amplifier, a first resistor, and a second resistor, wherein the first operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the first operational amplifier is connected to the rectifier module via the first resistor, the inverting input terminal and the output terminal of the first operational amplifier are connected via the second resistor, and the non-inverting input terminal of the first operational amplifier is grounded. The gamma voltage compensation method according to claim 10, wherein the second compensation module includes a second operational amplifier, a third resistor, and a fourth resistor, the second operational amplifier having a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the second operational amplifier being grounded via the third resistor, the inverting input terminal and the output terminal of the second operational amplifier being connected via the fourth resistor, and the non-inverting input terminal of the second operational amplifier being connected to the rectifier module.

12. The first output module includes a third operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor, wherein the third operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the third operational amplifier is grounded via the fifth resistor, the inverting input terminal and output terminal of the third operational amplifier are connected via the sixth resistor, the non-inverting input terminal of the third operational amplifier is connected to the first compensation module via the seventh resistor, the non-inverting input terminal of the third operational amplifier is connected to the first input line via the eighth resistor, and the non-inverting input terminal of the third operational amplifier is grounded via the ninth resistor. The second output module includes a fourth operational amplifier, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor, wherein the fourth operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the fourth operational amplifier is grounded via the tenth resistor, the inverting input terminal and output terminal of the fourth operational amplifier are connected via the eleventh resistor, the non-inverting input terminal of the fourth operational amplifier is connected to the second compensation module via the twelfth resistor, the non-inverting input terminal of the fourth operational amplifier is connected to the second input line via the thirteenth resistor, and the non-inverting input terminal of the fourth operational amplifier is grounded via the fourteenth resistor. The gamma voltage compensation method according to claim 10.

13. The rectifier module includes a diode, the positive terminal of which is connected to the frame start signal line, and the negative terminal of which is connected to the first compensation module and the second compensation module. The gamma voltage compensation method according to claim 10.

14. The gamma voltage compensation circuit further includes a constant voltage module, the constant voltage module includes a 15th resistor, a 16th resistor, and a constant voltage capacitor, the first compensation module and the second compensation module are connected via a first node, the 15th resistor is connected to the first node and the diode, the first node is grounded via the 16th resistor, and the first node is also grounded via the constant voltage capacitor. The gamma voltage compensation method according to claim 13.

15. The gamma voltage compensation circuit further includes a voltage divider module, the voltage divider module includes a 17th resistor and a 18th resistor, the 17th resistor being connected to the frame start signal line and the diode, and the second node between the 17th resistor and the diode being grounded via the 18th resistor. The gamma voltage compensation method according to claim 14.

16. The signal on the frame start signal line is an AC signal, and the reference voltage is a DC signal. The gamma voltage compensation method according to claim 9.

17. A display device comprising a gamma voltage compensation circuit, a gamma chip, and a display panel, wherein the gamma voltage compensation circuit is connected to the gamma chip and the display panel, The gamma voltage compensation circuit described above is An input module connected to the aforementioned gamma chip for inputting the base gamma voltage, A rectifier module connected to the frame start signal line and for converting the signal from the frame start signal line into a reference voltage, A compensation module connected to the rectifier module for generating a gamma compensation voltage based on the reference voltage, The input module, the compensation module, and the display panel are connected to an output module that generates a target gamma voltage by superimposing the base gamma voltage and the gamma compensation voltage, and outputs it to the data drive chip of the display panel. The differential voltage between the target gamma voltage and the common voltage has a negative correlation with the reference voltage. Display device.

18. The display device further includes a motherboard and a horizontal circuit board, the horizontal circuit board being connected to the display panel and the motherboard, the gamma chip being provided on the motherboard, and the gamma voltage compensation circuit being provided on the horizontal circuit board. The display device according to claim 17.

19. The input module includes a first input line and a second input line, the compensation module includes a first compensation module and a second compensation module, the output module includes a first output module and a second output module, the first compensation module is connected to the first input line and the first output module, and the second compensation module is connected to the second input line and the second output module. The base gamma voltage includes a positive base gamma voltage and a negative base gamma voltage, the first input line is for inputting the positive base gamma voltage to the first output module, and the second input line is for inputting the negative base gamma voltage to the second output module. The display device according to claim 17.

20. The first compensation module includes a first operational amplifier, a first resistor, and a second resistor, wherein the first operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the first operational amplifier is connected to the rectifier module via the first resistor, the inverting input terminal and the output terminal of the first operational amplifier are connected via the second resistor, and the non-inverting input terminal of the first operational amplifier is grounded. The second compensation module includes a second operational amplifier, a third resistor, and a fourth resistor, wherein the second operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the second operational amplifier is grounded via the third resistor, the inverting input terminal and output terminal of the second operational amplifier are connected via the fourth resistor, and the non-inverting input terminal of the second operational amplifier is connected to the rectifier module. The display device according to claim 19.

21. The first output module includes a third operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor, wherein the third operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the third operational amplifier is grounded via the fifth resistor, the inverting input terminal and output terminal of the third operational amplifier are connected via the sixth resistor, the non-inverting input terminal of the third operational amplifier is connected to the first compensation module via the seventh resistor, the non-inverting input terminal of the third operational amplifier is connected to the first input line via the eighth resistor, and the non-inverting input terminal of the third operational amplifier is grounded via the ninth resistor. The second output module includes a fourth operational amplifier, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor, wherein the fourth operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, the inverting input terminal of the fourth operational amplifier is grounded via the tenth resistor, the inverting input terminal and output terminal of the fourth operational amplifier are connected via the eleventh resistor, the non-inverting input terminal of the fourth operational amplifier is connected to the second compensation module via the twelfth resistor, the non-inverting input terminal of the fourth operational amplifier is connected to the second input line via the thirteenth resistor, and the non-inverting input terminal of the fourth operational amplifier is grounded via the fourteenth resistor. The display device according to claim 19.

22. The rectifier module includes a diode, the positive terminal of which is connected to the frame start signal line, and the negative terminal of which is connected to the first compensation module and the second compensation module. The display device according to claim 19.

23. The gamma voltage compensation circuit further includes a constant voltage module, the constant voltage module includes a 15th resistor, a 16th resistor, and a constant voltage capacitor, the first compensation module and the second compensation module are connected via a first node, the 15th resistor is connected to the first node and the diode, the first node is grounded via the 16th resistor, and the first node is also grounded via the constant voltage capacitor. The display device according to claim 22.

24. The gamma voltage compensation circuit further includes a voltage divider module, the voltage divider module includes a 17th resistor and a 18th resistor, the 17th resistor being connected to the frame start signal line and the diode, and the second node between the 17th resistor and the diode being grounded via the 18th resistor. The display device according to claim 23.

25. The signal on the frame start signal line is an AC signal, and the reference voltage is a DC signal. The display device according to claim 17.

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