Voltage compensation device and display screen

Abstract

The embodiment of the present application provides a voltage compensation device and a display screen. After the display driving module obtains the weighted average voltage signal, the display driving module determines the difference between the weighted average voltage signal and the reference voltage value, compensates the gray scale voltage according to the difference, and outputs the compensated gray scale voltage signal to the pixel circuit. Because the gray scale voltage output to the pixel circuit is compensated according to the difference between the weighted average voltage signal and the reference voltage value, the influence caused by the voltage fluctuation of the voltage drop of ELVDD provided by the power management module to the panel sub-pixel end can be eliminated, the pixel light emitting current is kept stable, and the display brightness is ensured to be normal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a voltage compensation device and display screen. BACKGROUND

[0002] In the driving circuit of the existing display product, the anode voltage ELVDD of each color sub-pixel light emitting device shares one path, and the cathode voltage ELVSS shares one path, ELVDD is a power supply voltage generated by a PMIC (Power Management IC, power management integrated circuit) circuit, Vdata output to the pixel circuit is a gray scale voltage generated by GAMMA (gamma circuit) correction, and the difference between ELVDD and Vdata determines the current flowing through the sub-pixel light emitting device.

[0003] As shown in Figure 1 , Figure 1 is a schematic diagram of a 7T1C pixel circuit, Figure 1 which includes 7 TFTs and 1 capacitor (C1), Figure 1 In the formula, ELVDD is the anode voltage, ELVSS is the cathode voltage, DATA is the gray scale voltage signal, Vint is the initialization signal, Gn-1, Gn and EM are all gate control signals, N1 and N2 are nodes, and O is a light emitting device.

[0004] The pixel light emitting current calculation formula of the 7T1C pixel circuit is as follows:

[0005]

[0006] Wherein, Io is the light emitting device current, wherein μ, Cox, and are parameters of the TFT (Thin Film Transistor, thin film transistor) pixel circuit, ELVDD is provided by an external independent PMIC (Power Management IC, power management chip), but the ELVDD provided by the PMIC will have a voltage drop when reaching the sub-pixel end of the panel, which results in that the current flowing through the sub-pixel light emitting device does not meet the expectation, and causes display abnormalities. SUMMARY

[0007] The purpose of the embodiments of the present application is to provide a voltage compensation device and display screen. The specific technical solutions are as follows:

[0008] In a first aspect, the embodiments of the present application provide a voltage compensation device, which comprises:

[0009] a power management module, a weighted average module, and a display driving module.

[0010] An output end of the power management module is connected to an input end of the weighted average module, an output end of the weighted average module is connected to an input end of the display driving module, and an output end of the display driving module is used to output a gray scale voltage signal;

[0011] The power management module is used to provide an anode voltage of each color sub-pixel and send the anode voltage of each color sub-pixel to a weighted average module;

[0012] The weighted average module is used to obtain an anode voltage of a different color sub-pixel, weight the anode voltage of each sub-pixel to obtain a weighted average voltage signal, and send the weighted average voltage signal to the display driving module;

[0013] The display driving module is used to compensate a gray scale voltage according to the weighted average voltage signal and output the compensated gray scale voltage signal to a pixel circuit.

[0014] In a possible implementation, the weighted average module comprises an anode voltage acquisition sub-module and a weighted average sub-module;

[0015] An input end of the anode voltage acquisition sub-module is connected to an output end of the power management module;

[0016] An output end of the anode voltage acquisition sub-module is connected to an input end of the weighted average sub-module;

[0017] An output end of the weighted average sub-module is connected to an input end of the display driving module.

[0018] In a possible implementation, the anode voltage acquisition sub-module comprises a plurality of sub-pixel resistors; each sub-pixel corresponds to a sub-pixel resistor;

[0019] The weighted average sub-module comprises an operational amplifier, a first resistor and a second resistor;

[0020] A positive input end of the operational amplifier is connected to a first end of each sub-pixel resistor, and a second end of each sub-pixel resistor is connected to an anode voltage of a corresponding sub-pixel;

[0021] An inverting input end of the operational amplifier is connected to a first end of the first resistor and a first end of the second resistor; a second end of the first resistor is grounded, and a second end of the second resistor is connected to an output end of the operational amplifier;

[0022] The inverting input end of the operational amplifier is used to be connected to the display driving module, and the weighted average voltage signal is output to the display driving module;

[0023] The positive pole of the operational amplifier is connected to a first power supply voltage, and the negative pole of the operational amplifier is grounded.

[0024] In a possible implementation, the power management module comprises a preset first power supply; the preset first power supply is configured to provide a first power supply voltage.

[0025] The positive pole of the operational amplifier is connected to the preset first power supply.

[0026] In a possible implementation, the display driving module is connected to the preset first power supply, and the preset first power supply is configured to provide a working voltage of the display driving module.

[0027] In a possible implementation, the weighted average module further comprises a third resistor.

[0028] The first end of the third resistor is connected to the non-inverting input terminal of the operational amplifier.

[0029] The second end of the third resistor is grounded.

[0030] In a possible implementation, the sub-pixels comprise red sub-pixels, green sub-pixels, and blue sub-pixels.

[0031] The weighted average module comprises red sub-pixel resistors, green sub-pixel resistors, and blue sub-pixel resistors.

[0032] In a possible implementation, the red sub-pixel resistors, the green sub-pixel resistors, and the blue sub-pixel resistors have equal resistance values.

[0033] The anode electrode of the red sub-pixel is a first voltage, the anode electrode of the green sub-pixel is a second voltage, and the anode electrode of the blue sub-pixel is a third voltage.

[0034] The weighted average voltage signal is:

[0035] ELVDD M = (ELVDD R + ELVDD G + ELVDD B ) / 3

[0036] wherein, ELVDD M is the weighted average voltage signal, ELVDD R is the first voltage, ELVDD G is the second voltage, and ELVDD B is the third voltage.

[0037] In a possible implementation, the display driving module comprises a compensation circuit sub-module and a gamma voltage generation sub-module.

[0038] The input end of the compensation circuit sub-module is connected to the output end of the weighted average module.

[0039] The output end of the compensation circuit sub-module is connected to the input end of the gamma voltage generation sub-module, and the output end of the gamma voltage generation sub-module is used to output a gray scale voltage signal.

[0040] In a second aspect, the embodiments of the present application provide a display screen, comprising the voltage compensation device of any one of the first aspect.

[0041] The embodiments of the present application have the following beneficial effects:

[0042] The voltage compensation device and the display screen provided by the embodiments of the present application, after the display driving module obtains the weighted average voltage signal, the display driving module determines the difference between the weighted average voltage signal and the reference voltage value, compensates the gray scale voltage (Vdata) according to the difference, and outputs the compensated gray scale voltage signal to the pixel circuit. Because the gray scale voltage output to the pixel circuit is compensated according to the difference between the weighted average voltage signal and the reference voltage value, the influence of the voltage fluctuation caused by the voltage drop of ELVDD provided by the power management module to the panel sub-pixel end can be eliminated, the pixel light emitting current is kept stable, and the display brightness is ensured to be normal. Moreover, because the anode voltages of different color sub-pixels are independently supplied, the anode voltages of different color sub-pixels are not shared by one line, and there is a difference in current when all the different color sub-pixels are lit, which causes a difference in voltage drop on each ELVDD line. The weighted average voltage signal is obtained according to the anode voltages of each sub-pixel, the display driving module compensates the gray scale voltage according to the weighted average voltage signal, which can weaken the under-compensation or over-compensation problem caused by the difference in voltage drop of different sub-pixel ELVDD lines, complete the compensation of the voltage drop of different color sub-pixel ELVDD, and improve the picture quality uniformity and production yield.

[0043] Of course, implementing any product or method of the present application does not necessarily require achieving all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other embodiments can also be obtained by those skilled in the art according to these drawings.

[0045] Figure 1 A schematic diagram of a 7T1C pixel circuit in the related art;

[0046] Figure 2A first schematic diagram of a voltage compensation device according to an embodiment of the present application;

[0047] Figure 3 A second schematic diagram of a voltage compensation device according to an embodiment of the present application;

[0048] Figure 4-1 A first schematic diagram of a weighted average module in a voltage compensation device according to an embodiment of the present application;

[0049] Figure 4-2 A second schematic diagram of a weighted average module in a voltage compensation device according to an embodiment of the present application;

[0050] Figure 4-3 A third schematic diagram of a weighted average module in a voltage compensation device according to an embodiment of the present application;

[0051] Figure 5 A third schematic diagram of a voltage compensation device according to an embodiment of the present application. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art based on the present application belong to the scope of protection of the present application.

[0053] As shown in Figure 2 The present application provides a voltage compensation device, which comprises:

[0054] a power management module 110, a weighted average module 120, and a display driving module 130;

[0055] An output end of the power management module 110 is connected to an input end of the weighted average module 120, an output end of the weighted average module 120 is connected to an input end of the display driving module 130, and an output end of the display driving module 130 is used to output a gray scale voltage signal;

[0056] The power management module 110 is used to provide an anode voltage of each color sub-pixel and send the anode voltage of each color sub-pixel to the weighted average module 120;

[0057] The weighted average module 120 is used to obtain an anode voltage of a different color sub-pixel, weight the anode voltage of each sub-pixel, obtain a weighted average voltage signal, and send the weighted average voltage signal to the display driving module 130;

[0058] The display driver module 130 is used to compensate the grayscale voltage according to the weighted average voltage signal, and output the compensated grayscale voltage signal to the pixel circuit.

[0059] The power management module provides the anode voltage for each color sub-pixel, for example, such as... Figure 3 As shown, the power management module can be a PMIC (111). In display panel products, the PMIC can be placed on the flexible circuit board of the display panel. Different color sub-pixels do not share a common anode voltage. For example, a pixel circuit includes three sub-pixels: R (red) sub-pixel, G (green) sub-pixel, and B (blue) sub-pixel. The power management module provides anode voltages to the R, G, and B sub-pixels respectively through three separate paths. The output of the power management module is connected to the input of the weighted averaging module, which obtains the anode voltage reaching the sub-pixel.

[0060] The weighted average module can be composed of multiple resistors and operational amplifiers. After obtaining the anode voltage of different color sub-pixels, the anode voltage of each sub-pixel can be weighted to obtain a weighted average voltage signal.

[0061] After acquiring the weighted average voltage signal, the display driver module determines the difference between the weighted average voltage signal and the reference voltage value to obtain the power supply voltage variation. This variation is then compensated to the peak value of the reference voltage (either the highest reference voltage VGMP_AVC or the lowest reference voltage VGSP_AVC), where VGMP_AVC and VGSP_AVC are reference levels for the grayscale voltage. Vdata is generated based on VGMP_AVC and VGSP_AVC, and the Vdata voltage value can be dynamically adjusted to keep the (ELVDD-Vdata) voltage value constant, thereby maintaining current stability.

[0062] In a possible implementation, the display driving module comprises a compensation circuit submodule and a gamma voltage generation submodule; an input end of the compensation circuit submodule is connected to an output end of the weighted average module; an output end of the compensation circuit submodule is connected to an input end of the gamma voltage generation submodule, and an output end of the gamma voltage generation submodule is configured to output a gray scale voltage signal. After the compensation circuit submodule obtains the weighted average voltage signal, the compensation circuit submodule determines a difference between the weighted average voltage signal and a reference voltage value, obtains a variation value of the power supply voltage, determines a highest reference voltage VGMP_AVC and a lowest reference voltage VGSP_AVC based on the variation value, wherein the highest reference voltage VGMP_AVC and the lowest reference voltage VGSP_AVC are voltages required by the highest reference voltage VGMP_AVC or the lowest reference voltage VGSP_AVC, the compensation circuit submodule sends the compensation circuit submodule to the gamma voltage generation submodule, and the gamma voltage generation submodule generates Vdata based on the highest reference voltage VGMP_AVC and the lowest reference voltage VGSP_AVC.

[0063] That is, the pixel light-emitting current is related to ELVDD and the gray scale voltage (Vdata), the anode voltages of the subpixels are weighted to obtain the weighted average voltage signal, and then the difference between the weighted average voltage signal and the reference voltage value is determined, and the gray scale voltage (Vdata) is compensated according to the difference, and the compensated gray scale voltage signal is output to the pixel circuit. Because the gray scale voltage output to the pixel circuit is compensated according to the difference between the weighted average voltage signal and the reference voltage value, the ELVDD physical voltage drop loss caused by the power supply circuit can be improved by compensating the Data voltage, and the influence of the voltage fluctuation caused by the voltage drop of ELVDD provided by the power management module to the subpixel end of the panel can be eliminated, so that the pixel light-emitting current remains stable, and the display brightness is ensured to be normal.

[0064] Moreover, because the anode voltages of different color subpixels are independently supplied, the anode voltages of different color subpixels are not shared by one line, and there is a difference in current when all the different color subpixels are lit, which causes a difference in voltage drop on each ELVDD line. The weighted average voltage signal is obtained by weighting the anode voltages of the subpixels, and the display driving module compensates the gray scale voltage based on the weighted average voltage signal, which can weaken the under-compensation or over-compensation problem caused by the difference in voltage drop of different ELVDD lines of different subpixels, optimize and improve the poor display brightness and chroma uniformity caused by the difference in voltage drop of different ELVDD lines of different subpixels, and solve the problem of display screen factory debugging and application client display effect difference caused by the difference in power supply line design between devices (for example, display screen and application client). In the power supply scheme in which the anode voltages of different color subpixels are independently supplied, power consumption is saved, and display quality and production yield are improved.

[0065] In one possible implementation, the weighted averaging module includes: an anode voltage acquisition submodule and a weighted averaging submodule;

[0066] The input terminal of the anode voltage acquisition submodule is connected to the output terminal of the power management module;

[0067] The output terminal of the anode voltage acquisition submodule is connected to the input terminal of the weighted average submodule;

[0068] The output of the weighted average submodule is connected to the input of the display driver module.

[0069] The anode voltage of each color sub-pixel output from the power management module can be obtained through the anode voltage acquisition sub-module. Then, the anode voltage of each color sub-pixel is weighted by the weighted averaging sub-module to obtain a weighted average voltage signal, which is then output to the display driver module.

[0070] In one possible implementation, the anode voltage acquisition submodule includes: a plurality of sub-pixel resistors; wherein each sub-pixel corresponds to one sub-pixel resistor;

[0071] The weighted average submodule includes: an operational amplifier, a first resistor, and a second resistor;

[0072] The non-inverting input terminal of the operational amplifier is connected to the first terminal of each sub-pixel resistor, and the second terminal of each sub-pixel resistor is connected to the anode voltage of the corresponding sub-pixel.

[0073] The inverting input terminal of the operational amplifier is connected to the first terminal of the first resistor and the first terminal of the second resistor; the second terminal of the first resistor is grounded and the second terminal of the second resistor is connected to the output terminal of the operational amplifier.

[0074] The inverting input of the operational amplifier is used to connect to the display driver module and output the weighted average voltage signal to the display driver module.

[0075] The positive terminal of the operational amplifier is connected to the first power supply voltage, and the negative terminal of the operational amplifier is grounded.

[0076] like Figure 4-1As shown, it includes n sub-pixels (sub-pixel a1, sub-pixel a2, ..., sub-pixel an), where ELVDD_a1 is the anode voltage of sub-pixel a1, ELVDD_a2 is the anode voltage of sub-pixel a2, ELVDD_an is the anode voltage of sub-pixel an, Ra1 is the resistance of sub-pixel a1, Ra2 is the resistance of sub-pixel a2, and Ran is the resistance of sub-pixel an. GND is the ground wire, U1 is the operational amplifier, R4 is the second resistor, and R5 is the first resistor. AVDD is the first power supply voltage, which provides the operating voltage for operational amplifier U1.

[0077] The anode voltage of sub-pixel a1, the resistance of sub-pixel a2, and the anode voltage of sub-pixel an are detected by Ra1, Ra2, ..., Ran respectively. A negative feedback amplification circuit is designed at the inverting terminal of the operational amplifier, and the weighting of the anode voltage of each color sub-pixel is realized by the operational amplifier U1.

[0078] In one possible implementation, the power management module includes a preset first power supply; the preset first power supply is used to provide a first power supply voltage;

[0079] The positive terminal of the operational amplifier is connected to the preset first power supply.

[0080] Operational amplifiers require a power supply voltage to operate. Since the power management module can provide the power supply voltage, a preset first power supply can be set in the power management module to supply power to the operational amplifiers sequentially.

[0081] In one possible implementation, the display driver module is connected to the preset first power supply.

[0082] The display driver module also requires power supply voltage when it is working. The display driver module is connected to the preset first power supply of the power management module, so that the operational amplifier and the display driver module share the same power supply, which can save resources.

[0083] based on Figure 4-1 The implementation shown is as follows: Figure 4-2 As shown, in one possible implementation, the weighted average module further includes a third resistor R6;

[0084] The first end of the third resistor R6 is connected to the non-inverting input terminal of the operational amplifier U1;

[0085] The second terminal of the third resistor R6 is grounded.

[0086] R6 can be used to limit the current and prevent damage to the operational amplifier U1 when the voltage is too high.

[0087] In one possible implementation, the sub-pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel;

[0088] The weighted average module includes red sub-pixel resistors, green sub-pixel resistors, and blue sub-pixel resistors.

[0089] Based on the above embodiments, such as Figure 4-3 As shown, ELVDD_R is the anode voltage of the red sub-pixel, ELVDD_G is the anode voltage of the green sub-pixel, ELVDD_B is the anode voltage of the blue sub-pixel, R1 is the resistor for the red sub-pixel, R2 is the resistor for the green sub-pixel, and R3 is the resistor for the blue sub-pixel. GND is the ground wire, U1 is the operational amplifier, R4 is the second resistor, R5 is the first resistor, and R6 is the third resistor. AVDD is the first power supply voltage, which provides the operating voltage for operational amplifier U1.

[0090] The anode voltages of the red, green, and blue sub-pixels are detected by R1, R2, and R3 respectively. A negative feedback amplifier circuit is designed at the inverting terminal of the operational amplifier, and the weighting of the anode voltages of each color sub-pixel is achieved by operational amplifier U1.

[0091] In one possible implementation, the resistance values ​​of the red sub-pixel resistor, the green sub-pixel resistor, and the blue sub-pixel resistor are equal;

[0092] The anode electrode of the red sub-pixel is a first voltage, the anode electrode of the green sub-pixel is a second voltage, and the anode electrode of the blue sub-pixel is a third voltage;

[0093] The weighted average voltage signal is:

[0094] ELVDD M =(ELVDD) R +ELVDD G +ELVDD B ) / 3

[0095] Among them, ELVDD M For the weighted average voltage signal, ELVDD R For the first voltage, ELVDD G For the second voltage, ELVDD B This is the third voltage.

[0096] Assuming the voltage after the ELVDD_R line voltage drop is 4.56V, the voltage after the ELVDD_G line voltage drop is 4.57V, and the voltage after the ELVDD_B line voltage drop is 4.55V, the weighted average module calculates the ELVDD_M voltage to be approximately 4.56V.

[0097] When the resistance values ​​of the red sub-pixel resistor, the green sub-pixel resistor, and the blue sub-pixel resistor are equal, the average value of the anode voltage of the red sub-pixel, the anode voltage of the green sub-pixel, and the anode voltage of the blue sub-pixel can be calculated. The average value is the weighted average voltage signal.

[0098] In one possible implementation, the display driving module includes a compensation circuit submodule and a gamma voltage generation submodule;

[0099] The input terminal of the compensation circuit submodule is connected to the output terminal of the weighted average module;

[0100] The output terminal of the compensation circuit submodule is connected to the input terminal of the gamma voltage generation submodule, and the output terminal of the gamma voltage generation submodule is used to output a grayscale voltage signal.

[0101] The compensation circuit submodule is connected to the output of the weighted averaging module. In other words, the weighted averaging module sends the weighted average voltage to the compensation circuit submodule, which then determines the voltage drop on the line based on the weighted average voltage. It then generates the VGMP_AVC and VGSP_AVC voltages required by the gamma voltage generation submodule. For example, the compensation circuit submodule includes operational amplifier adders and subtractors, which correspondingly generate the VGMP_AVC (highest reference voltage) and VGSP_AVC (lowest reference voltage) required by the gamma voltage generation submodule.

[0102] That is, after the compensation circuit submodule obtains the weighted average voltage signal, it determines the difference between the weighted average voltage signal and the reference voltage value to obtain the power supply voltage variation value. Based on this variation value, it determines the highest reference voltage VGMP_AVC and the lowest reference voltage VGSP_AVC. The highest reference voltage VGMP_AVC and the lowest reference voltage VGSP_AVC are the voltages required for the highest reference voltage VGMP_AVC or the lowest reference voltage VGSP_AVC. The compensation circuit submodule sends the data to the gamma voltage generation submodule, which generates Vdata based on the highest reference voltage VGMP_AVC and the lowest reference voltage VGSP_AVC.

[0103] Based on the above embodiments, such as Figure 5 As shown, the sub-pixels include red, green, and blue sub-pixels. The PMIC module is a power management module that provides anode voltage to each sub-pixel, such as... Figure 5As shown, ELVDD_R is the anode voltage of the red sub-pixel, ELVDD_G is the anode voltage of the green sub-pixel, and ELVDD_B is the anode voltage of the blue sub-pixel. Simultaneously, the PMIC module provides operating voltages to the weighted averaging module and the display driver module, respectively. Figure 5 As shown, the weighted average module and the display driver module are provided with the same operating voltage, AVDD.

[0104] The weighted average module can be composed of multiple resistors and operational amplifiers. After obtaining the anode voltage of different color sub-pixels, the anode voltage of each sub-pixel is weighted to obtain the weighted average voltage signal ELVDD_M.

[0105] The display driver module includes an ELVDD compensation circuit submodule and a gamma voltage generation submodule. The weighted averaging module provides the weighted average voltage signal ELVDD_M to the ELVDD compensation circuit submodule of the display driver module. The ELVDD compensation circuit submodule determines the voltage drop on the line based on the weighted average voltage. It then generates the VGMP_AVC and VGSP_AVC voltages required by the gamma voltage generation submodule. The gamma voltage generation submodule generates Vdata based on the highest reference voltage VGMP_AVC and the lowest reference voltage VGSP_AVC, and outputs the compensated grayscale voltage signal to the pixel circuit.

[0106] After acquiring the weighted average voltage signal, the display driver module determines the difference between the weighted average voltage signal and the reference voltage value. Based on this difference, it compensates for Vdata and outputs the compensated grayscale voltage signal to the pixel circuit. Because the grayscale voltage output to the pixel circuit is compensated based on the difference between the weighted average voltage signal and the reference voltage value, it eliminates the voltage fluctuations caused by the voltage drop when the ELVDD supplied by the power management module reaches the panel sub-pixel end, keeping the pixel luminous current stable and ensuring normal display brightness. Furthermore, because the anode voltages of different color sub-pixels are supplied independently and do not share a common path, the current differs when all different color sub-pixels are lit, resulting in voltage drop differences on each ELVDD line. The weighted average voltage signal is obtained by weighting the anode voltages of each sub-pixel. By compensating the grayscale voltage based on the weighted average voltage signal, the display driver module can mitigate the undercompensation or overcompensation problems caused by the different voltage drop differences in the ELVDD lines of different sub-pixels, thus completing the compensation for the ELVDD voltage drop of different color sub-pixels and improving image quality uniformity and production yield.

[0107] This application also provides a display screen including the voltage compensation device described in any of the above embodiments.

[0108] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0109] The various embodiments in this specification are described in a related manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0110] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A voltage compensation device, characterized by, The device comprises: a power management module, a weighted average module, and a display driving module; an output end of the display driving module is configured to output a gray scale voltage signal; the power management module is configured to provide an anode voltage of each color sub-pixel and send the anode voltage of each color sub-pixel to the weighted average module; the weighted average module is configured to obtain the anode voltage of each color sub-pixel, weight the anode voltage of each sub-pixel, obtain a weighted average voltage signal, and send the weighted average voltage signal to the display driving module; the display driving module is configured to compensate the gray scale voltage according to the weighted average voltage signal and output the compensated gray scale voltage signal to a pixel circuit; the weighted average module comprises an anode voltage acquisition sub-module and a weighted average sub-module; the anode voltage acquisition sub-module comprises a plurality of sub-pixel resistors; each sub-pixel corresponds to a sub-pixel resistor; the weighted average sub-module comprises an operational amplifier, a first resistor, and a second resistor; a non-inverting input end of the operational amplifier is connected to a first end of each of the sub-pixel resistors, and a second end of each of the sub-pixel resistors is connected to the anode voltage of the corresponding sub-pixel; an inverting input end of the operational amplifier is connected to a first end of the first resistor and a first end of the second resistor; a second end of the first resistor is grounded, and a second end of the second resistor is connected to an output end of the operational amplifier; the inverting input end of the operational amplifier is configured to be connected to an input end of the display driving module, and the weighted average voltage signal is output to the display driving module; a positive electrode of the operational amplifier is connected to a first power supply voltage, and a negative electrode of the operational amplifier is grounded.

2. The apparatus of claim 1, wherein, the power management module comprises a preset first power supply; the preset first power supply is configured to provide a first power supply voltage; the positive electrode of the operational amplifier is connected to the preset first power supply.

3. The apparatus of claim 2, wherein, the display driving module is connected to the preset first power supply, and the preset first power supply is configured to provide a working voltage of the display driving module.

4. The apparatus of claim 1, wherein, the weighted average module further comprises a third resistor; a first end of the third resistor is connected to the non-inverting input end of the operational amplifier; a second end of the third resistor is grounded.

5. The apparatus of claim 1, wherein, the sub-pixels comprise red sub-pixels, green sub-pixels, and blue sub-pixels; the weighted average module comprises red sub-pixel resistors, green sub-pixel resistors, and blue sub-pixel resistors.

6. The apparatus of claim 5, wherein, the red sub-pixel resistors, the green sub-pixel resistors, and the blue sub-pixel resistors have equal resistance values; an anode electrode of the red sub-pixel is a first voltage, an anode electrode of the green sub-pixel is a second voltage, and an anode electrode of the blue sub-pixel is a third voltage; the weighted average voltage signal is ； wherein is a weighted average voltage signal, is a first voltage, is a second voltage, is a third voltage.

7. The apparatus of claim 1, wherein, the display driving module comprises a compensation circuit sub-module and a gamma voltage generation sub-module; an input end of the compensation circuit sub-module is connected to an output end of the weighted average module; an output end of the compensation circuit sub-module is connected to an input end of the gamma voltage generation sub-module, and an output end of the gamma voltage generation sub-module is configured to output a gray scale voltage signal.

8. A display screen, characterized by The voltage compensation device of any one of claims 1 to 7 is included.

Images