Voltage drop compensation method and device and display equipment

Abstract

The embodiment of the invention provides a voltage drop compensation method and device and display equipment. The method comprises the following steps: acquiring a current gray-scale value of a pixel circuit and a voltage drop parameter of the pixel circuit, wherein the voltage drop parameter is used for indicating a voltage drop between a power supply and the pixel circuit; determining a gray scale compensation parameter of the pixel circuit according to the voltage drop parameter, the current gray scale value and gray scale compensation information; wherein the gray scale compensation information is used for representing a mapping relation among the voltage drop parameter, the gray scale value of the pixel circuit and the gray scale compensation parameter; and compensating the current gray scale value of the pixel circuit according to the gray scale compensation parameter.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and in particular, to a voltage drop compensation method, device and display equipment. Background Art

[0002] Organic Light Emitting Diode (OLED) and flat panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream in display devices.

[0003] Patent applications CN118251982A, 202311324257.8, 202310731471.9, 202311686416.9, 202310707183.X, 202310479495.X, 202310445544.8, 202310731471.9, CN116685174A, and CN116669477A record relevant contents of pixel circuits of OLED display products for reference.

[0004] However, the display effects of current OLED display products still need to be optimized. Summary of the invention

[0005] In view of this, embodiments of the present application provide a new voltage drop compensation method, device and display device to at least partially solve the above problems.

[0006] According to a first aspect of an embodiment of the present application, a voltage drop compensation method is provided, the method comprising: obtaining a current grayscale value of a pixel circuit and a voltage drop parameter of the pixel circuit, the voltage drop parameter being used to indicate a voltage drop between a power supply and the pixel circuit; determining a grayscale compensation parameter of the pixel circuit according to the voltage drop parameter, the current grayscale value and grayscale compensation information; wherein the grayscale compensation information is used to characterize a mapping relationship among the voltage drop parameter, the grayscale value of the pixel circuit and the grayscale compensation parameter; and compensating for the current grayscale value of the pixel circuit according to the grayscale compensation parameter.

[0007] In some optional embodiments, the voltage drop parameter includes the total current value of the pixel circuit on the display panel, and the grayscale compensation information is used to characterize the mapping relationship between the total current value, the grayscale value of the pixel circuit and the grayscale compensation parameter; preferably, the pixel circuit includes pixel circuits of multiple colors, and the grayscale compensation information corresponding to pixel circuits of different colors is different.

[0008] In some optional embodiments, the method also includes: obtaining the grayscale compensation information through the following steps: establishing a loss conversion model with the voltage drop parameter as the input variable and the gamma voltage change corresponding to the voltage drop as the output variable; determining the grayscale compensation information based on the loss conversion model and a first mapping model for characterizing the mapping relationship between the gamma voltage and the grayscale value of the pixel circuit.

[0009] In some optional embodiments, the loss conversion model is established with the voltage drop parameter as the input variable and the gamma voltage change corresponding to the voltage drop as the output variable, including: taking the total current value as the input variable and the gamma voltage change corresponding to the voltage drop as the output variable, and establishing the loss conversion model according to a reference value of the total current value and a reference value of the gamma voltage change; wherein the reference value of the gamma voltage change is the value of the gamma voltage change corresponding to the voltage drop when the total current value is the reference value of the total current value; preferably, the reference value of the total current value is the maximum value of the total current, and the reference value of the gamma voltage change is the maximum value of the gamma voltage change.

[0010] In some optional embodiments, the method further includes: determining a reference value of the gamma voltage variation corresponding to the reference value of the total current value by the following steps: obtaining a first preset area and a second preset area of ​​a white area, wherein the first preset area is different from the second preset area; controlling the display panel to display the white area at the maximum brightness level according to the first preset area and the second preset area, respectively, and recording the total current of the pixel circuit in the display panel when the display panel displays the white area according to the first preset area and / or the second preset area;

[0011] adjusting the gamma voltage when the display panel displays the white area according to the first preset area, so that the average brightness of the picture when the display panel displays the white area according to the first preset area is the same as the average brightness of the picture when the display panel displays the white area according to the second preset area, and recording the adjustment amount of the gamma voltage;

[0012] A reference value of the gamma voltage variation corresponding to the reference value of the total current value is determined according to the first preset area, the second preset area, the adjustment amount, and the recorded total current.

[0013] In some optional embodiments, the grayscale compensation information is determined based on the loss conversion model and a first mapping model for characterizing the mapping relationship between the gamma voltage and the grayscale value of the pixel circuit, including: determining a second mapping model for characterizing the mapping relationship between the total current value, the grayscale value of the pixel circuit and the grayscale compensation parameter based on the loss conversion model and the first mapping model; determining the second mapping model as the grayscale compensation information; or, establishing a mapping relationship table including the total current value, the grayscale value of the pixel circuit, and the grayscale compensation parameters corresponding to the total current value and the grayscale value of the pixel circuit based on the second mapping model, and determining the mapping relationship table as the grayscale compensation information.

[0014] In some optional embodiments, the method further includes: obtaining the first mapping model by the following steps: establishing the first mapping model corresponding to the pixel circuit according to a plurality of binding point grayscales of the pixel circuit and a gamma voltage corresponding to each of the binding point grayscales.

[0015] An embodiment of the present application also provides a voltage drop compensation device, including: an acquisition module, used to acquire the current grayscale value of each pixel circuit and the voltage drop parameter of the pixel circuit, the voltage drop parameter is used to indicate the voltage drop between the power supply and the pixel circuit; a compensation parameter determination module, used to determine the grayscale compensation parameter of the pixel circuit according to the voltage drop parameter, the current grayscale value and grayscale compensation information; wherein the grayscale compensation information is used to characterize the mapping relationship between the voltage drop parameter, the grayscale value of the pixel circuit and the grayscale compensation parameter; a compensation module, used to compensate for the current grayscale value of the pixel circuit according to the grayscale compensation parameter.

[0016] An embodiment of the present application also provides a display device, including: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other through the communication bus; the memory is used to store at least one computer software, and the computer software enables the processor to execute the method described in any of the previous embodiments.

[0017] In the embodiment of the present application, the current grayscale value of the pixel circuit and the voltage drop parameter of the pixel circuit are obtained, and the voltage drop parameter is used to indicate the voltage drop between the power supply and the pixel circuit. The grayscale compensation parameter of the pixel circuit is determined according to the voltage drop parameter, the current grayscale value and the grayscale compensation information, and the current grayscale value of the pixel circuit is compensated according to the grayscale compensation parameter. By compensating the grayscale value of the pixel circuit with the grayscale compensation parameter determined based on the voltage drop parameter and the grayscale value, the brightness loss of the pixel circuit caused by the voltage drop between the power supply and the pixel circuit can be accurately compensated at the current grayscale, thereby effectively ensuring the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of an exemplary structure of a display device according to an embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of an exemplary structure of a display panel according to an embodiment of the present application;

[0021] Figure 3 is a flowchart of the steps of a voltage drop compensation method according to an embodiment of the present application;

[0022] Figure 4 is a simplified schematic diagram of a display panel circuit according to an embodiment of the present application;

[0023] Figure 5 is a flowchart of steps for determining grayscale compensation information according to an embodiment of the present application;

[0024] Figure 6 is a simplified schematic diagram of a pixel circuit according to an embodiment of the present application;

[0025] Figure 7 is a flowchart of steps for determining a reference value of a gamma voltage variation according to an embodiment of the present application;

[0026] Figure 8 is a structural schematic diagram of a voltage drop compensation device according to an embodiment of the present application;

[0027] Fig. 9 It is a schematic diagram of a display device according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0029] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in the embodiments of the present application refers to and includes any or all possible combinations of one or more associated listed items.

[0030] It should be understood that in the description of the embodiments of the present application, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the schemes of the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0031] In addition, when an element or layer is referred to as being “on,” “connected to,” or “coupled to” another element or layer, the element or layer may be directly on, directly connected to, or directly coupled to the other element or layer, or intervening elements or layers may be present. However, when an element or layer is referred to as being “directly on,” “directly connected to,” or “directly coupled to” another element or layer, there are no intervening elements or layers present.

[0032] The terms first, second, etc. are used to describe various elements, components, regions, layers and / or parts, but these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are used to distinguish one element, component, region, layer and / or part from another element, component, region, layer and / or part.

[0033] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] The specific implementation of the embodiment of the present application is further explained below in conjunction with the accompanying drawings of the embodiment of the present application.

[0035] See also Figure 1, an embodiment of the present application provides a display device 1. The display device 1 is an electronic device having an image (including: static image or dynamic image, wherein the dynamic image may be a video) display function. For example, the display device 1 may be any one of a display, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a personal digital assistant (PDA), a digital camera, a portable camcorder, a viewfinder, a navigator, a large-area wall, a home appliance, an information query device (such as business query devices for e-government, banks, hospitals, power and other departments), a monitor, an electronic painting screen, a virtual reality (VR) display device, an augmented reality (AR) display device and a vehicle-mounted display, but is not limited thereto.

[0036] In some embodiments, see Figure 1 The display device 1 may include a display panel 10. For example, the display panel 10 may be a self-luminous display panel 10. For example, the display panel 10 may be any one of an organic light emitting diode (OLED) display panel 10, a quantum dot light emitting diode (QLED) display panel 10, and a micro light emitting diode (Mini LED or Micro LED) display panel 10. In an optional embodiment of the present application, the display panel 10 included in the display device 1 may be a display panel 10 described in any of the following embodiments.

[0037] See also Figure 2 The display panel 10 has a display area AA and a non-display area SA, wherein the display area AA is an area on the display panel 10 for displaying images, and the non-display area SA is an area on the display panel 10 other than the display area AA. The non-display area SA may be located on at least one side (e.g., one side, or multiple sides) of the display area AA, for example, the non-display area SA may be arranged around the display area AA.

[0038] A plurality of pixel circuits are arranged in the display area AA. A plurality of pixel circuit arrays are arranged in the display area AA, and each pixel circuit can display a single color. For example, the pixel circuits arranged in the display area AA may include a red pixel circuit R, a green pixel circuit G, and a blue pixel circuit B, which are used to display red, green, and blue, respectively. A plurality of pixel circuits may be arranged in the display area AA according to a specified rule. For example, a plurality of sub-pixels are arranged in a plurality of rows and columns. Since each pixel circuit includes a pixel driving circuit, the pixel driving circuits are also arranged in a plurality of rows and columns.

[0039] In a display device, the power supply is connected to the pixel circuit of the display panel through a power delivery network (PDN). The resistance in the power delivery network causes a voltage drop (IR drop) between the power supply and the pixel circuit. This voltage drop reduces the voltage of the pixel circuit, causing the brightness of the light emitted by the pixel circuit to decrease, thereby affecting the display effect of the display panel.

[0040] The embodiment of the present application provides a voltage drop compensation method for a display panel to at least partially solve the above problems, thereby optimizing the display effect of the display panel. The voltage drop compensation method provided by the embodiment of the present application is described in detail below.

[0041] like Figure 3 As shown, the voltage drop compensation method of the display panel includes:

[0042] S110 , obtaining a current grayscale value of each pixel circuit and a voltage drop parameter of the pixel circuit, where the voltage drop parameter is used to indicate a voltage drop between a power source and the pixel circuit.

[0043] Figure 4 A simplified schematic diagram of a display panel circuit is shown, where the voltage drop between the power source ELVDD and the pixel circuit 100 is, and the voltage occupied by the resistor R0 of the power transmission network L0 between the power source ELVDD and the display panel wiring L1 is the product of the total current I of the pixel circuit on the display panel and the resistor R0 of the power transmission network. The display panel wiring is connected to each pixel circuit 100 included in the display panel.

[0044] In some optional embodiments, the voltage drop parameter includes a total current value of a pixel circuit of the display panel, and the grayscale compensation information is used to characterize a mapping relationship among the total current value, the grayscale value of the pixel circuit, and the grayscale compensation parameter.

[0045] The resistance of the power transmission network is a fixed value, and the voltage drop between the power supply and the pixel circuit can be obtained by multiplying the total current value of the pixel circuit of the display panel by the fixed value. The total current value of the pixel circuit is the sum of the current values ​​of the branches occupied by the pixel circuits included in the display panel on the power transmission network. Of course, in other optional embodiments of the present application, the voltage drop parameter may also be other suitable circuit parameters, such as directly the voltage drop between the power supply and the pixel circuit. A current detection device may be provided in the display panel to detect the total current of the pixel circuit included in the display panel, and a voltage detection device may also be provided to detect the voltage drop between the power supply and the pixel circuit.

[0046] In an embodiment of the present application, the total current value of the pixel circuit of the display panel is set as a voltage drop parameter, and the total current value of the pixel circuit of the display panel can be used to indicate the voltage drop between the power supply and the pixel circuit. After obtaining the total current value of the pixel circuit of the display panel, the grayscale compensation parameter can be determined based on the total current value of the pixel circuit of the display panel and the current grayscale value, without obtaining the specific voltage drop value between the power supply and the pixel circuit, which can improve the efficiency of determining the grayscale compensation parameter.

[0047] S120, determining a grayscale compensation parameter of the pixel circuit according to the voltage drop parameter, the current grayscale value and the grayscale compensation information; wherein the grayscale compensation information is used to characterize a mapping relationship among the voltage drop parameter, the grayscale value of the pixel circuit and the grayscale compensation parameter.

[0048] S130 , compensating the current grayscale value of the pixel circuit according to the grayscale compensation parameter.

[0049] By compensating the grayscale value of the pixel circuit, the brightness of the pixel circuit can be improved to compensate for the brightness loss of the pixel circuit caused by the voltage drop between the power supply and the pixel circuit, thereby ensuring the display effect of the display panel. In the embodiment of the present application, samples including different voltage drop parameters and current grayscale values ​​can be set to determine the grayscale compensation parameters corresponding to each sample. For example, the grayscale compensation parameters corresponding to each sample can be determined through relevant experiments. After that, grayscale compensation information can be obtained according to the mapping relationship between the voltage drop parameters of each sample and the current grayscale value and the corresponding grayscale compensation parameters. After the grayscale of the pixel circuit is compensated by the method of the embodiment of the present application, the brightness and color coordinate changes of the display panel caused by the voltage drop can be accurately compensated. Through experimental detection, after the grayscale of the pixel circuit is compensated by this method, the brightness error is only 5.5nit, the error of x in the color coordinate can reach less than 0.001, and the error of y can reach less than 0.004.

[0050] In the embodiment of the present application, the current grayscale value of the pixel circuit and the voltage drop parameter of the pixel circuit are obtained, and the voltage drop parameter is used to indicate the voltage drop between the power supply and the pixel circuit. The grayscale compensation parameter of the pixel circuit is determined according to the voltage drop parameter, the current grayscale value and the grayscale compensation information, and the current grayscale value of the pixel circuit is compensated according to the grayscale compensation parameter. By compensating the grayscale value of the pixel circuit with the grayscale compensation parameter determined based on the voltage drop parameter and the grayscale value, the brightness loss of the pixel circuit caused by the voltage drop between the power supply and the pixel circuit can be accurately compensated at the current grayscale, thereby effectively ensuring the display effect of the display panel.

[0051] like Figure 5 As shown, in some optional embodiments, the voltage drop compensation method further includes: obtaining grayscale compensation information by the following steps:

[0052] S210, establishing a loss conversion model with a voltage drop parameter as an input variable and a gamma voltage change amount corresponding to the voltage drop as an output variable.

[0053] S220 , determining grayscale compensation information according to the loss conversion model and a first mapping model for characterizing a mapping relationship between a gamma voltage and a grayscale value of a pixel circuit.

[0054] The pixel circuit of the display panel under ideal conditions can be simplified as Figure 6 The circuit in which ELVDD is the power supply voltage, ELVSS can be the ground voltage, Vdata is the data voltage provided to the gate of T1, T1 is the driving transistor for driving the pixel light emitting unit A, and the saturation region current I of T1 is ds It can be expressed by the following formula:

[0055]

[0056] Where L is the channel length of T1, W is the width of the source and drain of T1, μ eff is the drift mobility of majority carriers in the T1 channel, C ox is the unit area capacitance of the MIS (Metal Insulator Semiconductor) structure of T1, V gs is the voltage difference between the gate and source of T1, V th is the threshold voltage of T1. The total current value of the pixel circuit can be obtained by ds Sum obtained.

[0057] exist Figure 6 In the example, the gate voltage of T1 is Vdata-|V th |. The source voltage of T1 is ELVDD. Substituting the gate voltage and source voltage of T1 in the figure into the above formula, we can get I ds :

[0058]

[0059] Where L, W, μ eff , C ox are all constants, so I ds It can be expressed as I ds =β(ELVDD-Vdata) 2 , β is a constant, that is, I ds and (ELVDD-Vdata) 2 The brightness of the pixel light-emitting unit in the pixel circuit is directly proportional to the current of the pixel circuit, so the brightness of the pixel light-emitting unit is proportional to (ELVDD-Vdata) 2In direct proportion.

[0060] The above is an ideal situation, but in reality, due to the voltage drop △V between the power supply and the pixel circuit, the source voltage of T1 is actually ELVDD-△V, that is, the brightness of the pixel light-emitting unit is actually (ELVDD-△V-Vdata) 2 Linearly related. To compensate for △V, Vdata can be adjusted to keep the overall stability of (ELVDD-△V-Vdata).

[0061] In the embodiment of the present application, the gamma voltage of the pixel circuit is adjusted by compensating / adjusting the current grayscale value of the pixel circuit, and Vdata is adjusted by adjusting the gamma voltage of the pixel circuit. By adjusting Vdata, the voltage drop △V is compensated.

[0062] In the embodiment of the present application, by establishing a loss conversion model with a voltage drop parameter as an input variable and a gamma voltage change amount corresponding to the voltage drop as an output variable, a mapping relationship between the gamma voltage and Vdata can be obtained. According to the first mapping model, a mapping relationship between the gamma voltage and the grayscale value of the pixel circuit can be obtained, so that the adjustment amount of Vdata can be determined according to the voltage drop △V indicated by the grayscale compensation parameter. According to the loss conversion model, the gamma voltage adjustment amount corresponding to the adjustment amount of Vdata is determined, and then according to the first mapping model, the adjustment amount of the grayscale value corresponding to the gamma voltage adjustment amount is determined. According to the adjustment amount of the grayscale value, the grayscale compensation parameter is obtained, and then the grayscale compensation information used to characterize the mapping relationship between the voltage drop parameter, the grayscale value of the pixel circuit and the grayscale compensation parameter is obtained. It can be seen that the steps of obtaining the grayscale compensation information in this embodiment are logically rigorous and can accurately determine the grayscale compensation information.

[0063] In some optional embodiments, a loss conversion model is established with a voltage drop parameter as an input variable and a gamma voltage change amount corresponding to the voltage drop as an output variable, including:

[0064] The total current value is used as an input variable, the gamma voltage change corresponding to the voltage drop is used as an output variable, and a loss conversion model is established according to the maximum value of the total current value and the maximum value of the gamma voltage change. The reference value of the gamma voltage change is the value of the gamma voltage change corresponding to the voltage drop when the total current value is the reference value of the total current value.

[0065] There is the following relationship between the data voltage Vdata and the gamma voltage Vγ:

[0066] Vdata=Vgmp-(Vgmp-Vgsp) / d*Vγ (Formula 3)

[0067] Wherein, Vgmp is the maximum value of the reference voltage of the gamma voltage, that is, the gamma voltage corresponding to the black screen; Vgsp is the minimum value of the reference voltage of the gamma voltage, that is, the gamma voltage corresponding to the white screen; d is the gamma voltage value / gamma register value corresponding to the current grayscale of the pixel unit where the pixel electrode is located, such as 4096.

[0068] It can be seen that the data voltage Vdata is linearly correlated with the gamma voltage Vγ. Therefore, the change in the data voltage Vdata is proportional to the change in the gamma voltage Vγ. In order to compensate for the voltage drop △V, the value of Vdata needs to increase by △V, that is, the change in Vdata is △V. Since the data voltage Vdata is linearly correlated with the gamma voltage Vγ, the change in the data voltage Vdata is proportional to the change in the gamma voltage Vγ. The gamma voltage change △Vγ corresponding to the increase in Vdata by △V can be expressed as:

[0069] △Vγ=K*△V (Formula 4)

[0070] K is the proportionality coefficient, which can be obtained from the above (Vgmp-Vgsp) / d.

[0071] In addition, if the total current of the pixel circuit is I, and the resistance of the power transmission network between the power supply and the pixel circuit is R0, then the voltage drop △V=I*R0, where R0 is a fixed value. Correspondingly, the gamma voltage change △Vγ corresponding to the voltage drop △V can be expressed as:

[0072] △Vγ=K*I*R0 (Formula 5)

[0073] According to the above formula 5, the loss conversion model can be obtained as:

[0074] △Vγ=(I / Iref)*△Vγref (Formula 6)

[0075] Iref is a reference value of the total current value, and △Vγref is a reference value of the gamma voltage change amount.

[0076] As a feasible implementation method, the reference value of the total current value is the maximum value of the total current, and the reference value of the gamma voltage change is the maximum value of the gamma voltage change. At this time, the loss conversion model is:

[0077] △Vγ=(I / I MAX )*△Vγ MAX (Formula 7)

[0078] I MAX is the maximum value of the total current, Vγ MAXThe maximum value of the total current and the maximum value of the gamma voltage change are easier to obtain than other corresponding reference values. Therefore, by setting the reference value of the total current value to the maximum value of the total current and the reference value of the gamma voltage change to the maximum value of the gamma voltage change, it is helpful to reduce the difficulty of determining the loss conversion model.

[0079] In an embodiment of the present application, the total current value can be used as an input variable, and the gamma voltage change corresponding to the voltage drop can be used as an output variable. A loss conversion model can be established based on the maximum value of the total current value and the maximum value of the gamma voltage change. Therefore, it is only necessary to obtain the total current of the pixel circuit on the display panel, and the gamma voltage change corresponding to the voltage drop can be obtained as the output variable through the loss conversion model, which can improve the efficiency of determining the gamma voltage change.

[0080] In some optional embodiments, the grayscale compensation method further includes: obtaining a first mapping model by the following steps:

[0081] According to the multiple binding point grayscales of the pixel circuit and the gamma voltage corresponding to each binding point grayscale, a first mapping model corresponding to the pixel circuit is established. The number of the multiple binding point grayscales can be less than 256, that is, only some grayscales can be used as binding point grayscales, and the embodiment of the present application does not limit the specific number of binding point grayscales. When establishing the first mapping model of the pixel circuit, the binding point grayscale of the pixel circuit and the gamma voltage corresponding to each binding point grayscale can be obtained in advance.

[0082] The first mapping model is used to characterize the mapping relationship between the gamma voltage and the grayscale value of the pixel circuit. The first mapping model can be determined by data fitting according to multiple binding point grayscales of the pixel circuit and the gamma voltage corresponding to each binding point grayscale.

[0083] As a feasible implementation, the first mapping model may be:

[0084] Vγ= Vγ0+(Gray / 255) n ×Vγ MAX (Formula 8)

[0085] Vγ0 is the gamma voltage when the grayscale value of the pixel circuit is 0, Vγ MAX is the maximum value of the gamma voltage change, that is, the gamma voltage when the grayscale value of the pixel circuit is 255, Gray is the grayscale value of the pixel point circuit, and n is the coefficient to be determined. The grayscale of the binding point and the gamma voltage under the grayscale of the binding point are substituted into formula 8 for curve fitting to obtain Vγ0, Vγ MAX The first mapping model may also be obtained by other suitable methods, which will not be described in detail here.

[0086] As an optional embodiment, the pixel circuit includes pixel circuits of multiple colors, and the grayscale compensation information corresponding to the pixel circuits of different colors is different. Optionally, the pixel circuit in the embodiment of the present application may include pixel circuits of three colors: red, green and blue.

[0087] In the related art, when compensating the light emission of a pixel circuit, the color of the pixel circuit is usually not distinguished. However, at the same grayscale, the gamma voltages of pixel circuits of different colors are usually different. If the color of the pixel circuit is not distinguished, the actual compensation obtained by pixel circuits of different colors will be different under the same compensation parameters. This problem is particularly significant when the gamma voltages of pixel circuits of different colors are greatly different at the same grayscale.

[0088] In the embodiment of the present application, the pixel circuit includes pixel circuits of multiple colors. In the process of determining the grayscale compensation information of the pixel circuit of each color, the parameters of the relevant formula can be taken as the corresponding parameters when the pixel circuit is a pixel circuit of the color. For example, when using formulas 6, 7, 9, 11 and 12, △Vγref and △Vγ MAX Take the △Vγref and △Vγ corresponding to the pixel circuit of this color MAX Values, namely △Vγref and △Vγ MAX One-to-one correspondence with pixel circuits of different colors. When determining the parameter value of the first mapping model / Formula 8, the parameter value of the first mapping model corresponding to the color pixel circuit is determined according to the binding point grayscale of the color pixel circuit and the gamma voltage value of the color pixel circuit corresponding to each binding point grayscale, so that the grayscale compensation information corresponding to the pixel circuits of different colors is different, and according to the grayscale compensation information of the color pixel circuit, the current grayscale value of the color pixel circuit can be accurately compensated.

[0089] For example, the grayscale value of the binding point grayscale and the gamma voltage value corresponding to the binding point grayscale may be shown in Table 1 below. MAX The values ​​of Vγ, , and n can be found in Table 2. R , Vγ G and Vγ B , respectively represent the gamma voltages of pixel circuits of three colors: red, green and blue. In Table 2, R, G and B respectively represent pixel circuits of three colors: red, green and blue.

[0090] Table 1:

[0091] Bind some grayscale <![CDATA[Vγ R ]]> <![CDATA[Vγ G ]]> <![CDATA[Vγ B ]]> 0 0 0 0 1 435 336 453 4 445 346 473 6 505 404 542 8 547 450 589 13 618 523 659 18 674 580 716 22 720 627 769 32 795 700 852 41 858 761 921 51 910 811 978 60 958 857 1029 79 1041 937 1119 98 1117 1007 1200 117 1188 1071 1277 136 1258 1134 1352 155 1327 1195 1424 174 1395 1256 1498 192 1463 1319 1574 211 1537 1383 1650 230 1612 1451 1727 249 1693 1527 1811

[0092] Table 2:

[0093] <![CDATA[Vγ0]]> n <![CDATA[Vγ MAX ]]> R 547 0.75 1146 G 450 0.75 1077 B 589 0.75 1222

[0094] In the embodiment of the present application, a first mapping model corresponding to the pixel circuit can be established based on fewer binding point grayscales of the pixel circuit and the gamma voltage corresponding to each binding point grayscale, without having to establish the first mapping model corresponding to the pixel circuit based on all grayscales of the pixel circuit and the gamma voltages corresponding to all grayscales, which is beneficial to improving the efficiency of establishing the first mapping model.

[0095] like Figure 7 As shown, in some optional embodiments, the grayscale compensation method further includes: determining a reference value of a gamma voltage variation amount corresponding to a reference value of a total current value by the following steps:

[0096] S310: Acquire a first preset area and a second preset area of ​​a white area, where the first preset area is different from the second preset area.

[0097] Exemplarily, the first preset area may be 10% of the area of ​​the display region on the display panel, and the second preset area may be 100% of the area of ​​the display region on the display panel.

[0098] S320, controlling the display panel to display a white area at a maximum brightness level according to a first preset area and a second preset area, respectively, and recording a total current of a pixel circuit in the display panel when the display panel displays the white area according to the first preset area and / or the second preset area.

[0099] It should be noted that the area outside the white area on the display panel can be a black area, that is, a non-luminous area. The first preset area is marked as S1, and the second preset area is marked as S2. When the display panel displays the white area according to the first preset area and the second preset area, the total current of the pixel circuit is I1 and I2 respectively, and the ratio of S1 to S2 is approximately equal to the ratio of I1 to I2.

[0100] Optionally, the total current value of the pixel circuit can be directly measured. The total current value of the pixel circuit can also be measured indirectly, for example, the average brightness or average grayscale of the pixel circuit on the display panel can be detected, and the total circuit value of the pixel circuit can be determined according to the average brightness or average grayscale.

[0101] S330, adjusting the gamma voltage when the display panel displays the white area according to the first preset area, so that the average brightness of the picture when the display panel displays the white area according to the first preset area is the same as the average brightness of the picture when the display panel displays the white area according to the second preset area, and recording the adjustment amount of the gamma voltage.

[0102] The gamma voltage is adjusted by △Vγ 1-2 , the total area of ​​the display panel is S0, and the following formula can be approximated:

[0103] (S2-S1) / S0=△Vγ1-2 / Vγ MAX (Formula 9)

[0104] (S2-S1) / S0=(I2-I1) / I MAX (Formula 10)

[0105] Iref / I MAX =△Vγref / Vγ MAX (Formula 11)

[0106] It should be understood that the reference value of the total current value is less than or equal to the maximum value of the total current value. The maximum value of the total current value can be obtained through actual measurement or through formula 10.

[0107] S340, determining a reference value of a gamma voltage variation amount corresponding to a reference value of the total current value according to the first preset area, the second preset area, the adjustment amount, and the recorded total current.

[0108] Substituting the first preset area, the second preset area, the adjustment amount and the recorded total current into the above formulas 8-10, the reference value of the gamma voltage change amount corresponding to the reference value of the total current value can be obtained.

[0109] In the embodiment of the present application, different first preset areas and second preset areas can be obtained, and the display panel can be controlled to display the white area at the maximum brightness level according to the first preset area and the second preset area, respectively, and the total current of the pixel circuit in the display panel when the display panel displays the white area according to the first preset area and / or the second preset area is recorded. By adjusting the gamma voltage when the display panel displays the white area according to the first preset area, the average brightness of the picture when the display panel displays the white area according to the first preset area is made the same as the average brightness of the picture when the display panel displays the white area according to the second preset area, and the adjustment amount of the gamma voltage is recorded. The reference value of the gamma voltage change amount corresponding to the reference value of the total current value can be determined based on the first preset area, the second preset area, the adjustment amount, and the recorded total current, and the reference value of the total current value and the reference value of the gamma voltage change amount can be simply and conveniently obtained, thereby improving the efficiency of establishing the loss conversion model.

[0110] In some optional embodiments, determining grayscale compensation information according to the loss conversion model and a first mapping model for characterizing a mapping relationship between a gamma voltage and a grayscale value of a pixel circuit includes:

[0111] According to the loss conversion model and the first mapping model, a second mapping model for characterizing the mapping relationship among the total current value, the grayscale value of the pixel circuit and the grayscale compensation parameter is determined.

[0112] The second mapping model is determined as grayscale compensation information. Alternatively, a mapping relationship table including the total current value, the grayscale value of the pixel circuit, and the grayscale compensation parameters corresponding to the total current value and the grayscale value of the pixel circuit is established according to the second mapping model, and the mapping relationship table is determined as the grayscale compensation information.

[0113] If the compensated grayscale value is Gray', then according to the first mapping model represented by the above formula 8, the gamma voltage corresponding to the compensated grayscale value Gray' is:

[0114] Vγ+△Vγ=Vγ0+(Gray' / 255) n ×Vγ MAX (Formula 12)

[0115] According to formula 8 and formula 12, the grayscale value Gray' after brightness compensation is:

[0116]

[0117] The grayscale compensation amount offset from grayscale value Gray to grayscale value Gray' is:

[0118]

[0119] As a feasible implementation method, offset can be directly taken as the grayscale compensation parameter. By substituting Formula 6 and Formula 8 into Formula 14, a second mapping model can be obtained, in which the input variables are the total current value and the grayscale value of the pixel circuit, the output variable is the grayscale compensation parameter, and the other parameters are known quantities.

[0120] The mapping relationship table may include multiple groups of different total current values ​​and grayscale values, and grayscale compensation parameters corresponding to each group of total current values ​​and grayscale values. When determining the grayscale compensation parameters of a certain pixel circuit, the grayscale compensation parameters of the pixel circuit can be determined by looking up the mapping relationship table based on the current grayscale value of the pixel circuit and the current total current value of the pixel circuit on the display panel. It should be understood that if the mapping relationship table includes multiple groups of total current values ​​and grayscale values, but does not include the current grayscale value of the pixel circuit and the current total current value of the pixel circuit on the display panel, the grayscale compensation parameters of the pixel circuit can be determined by interpolation or other methods.

[0121] In an embodiment of the present application, a second mapping model for characterizing the mapping relationship between the total current value, the grayscale value of the pixel circuit, and the grayscale compensation parameter can be determined based on the loss conversion model and the first mapping model, and the second mapping model can be determined as grayscale compensation information, so that the total current value of the current pixel circuit and the grayscale compensation information when the current grayscale value is any value can be directly determined based on the second mapping model. Alternatively, a mapping relationship table including the total current value, the grayscale value of the pixel circuit, and the grayscale compensation parameters corresponding to the total current value and the grayscale value of the pixel circuit is established according to the second mapping model, and the mapping relationship table is determined as grayscale compensation information, so that the grayscale compensation parameters can be quickly determined by looking up the table.

[0122] like Figure 8 As shown, the embodiment of the present application further provides a voltage drop compensation device 800 for a display panel, comprising:

[0123] The acquisition module 810 is used to acquire the current grayscale value of each pixel circuit and the voltage drop parameter of the pixel circuit, where the voltage drop parameter is used to indicate the voltage drop between the power supply and the pixel circuit.

[0124] The compensation parameter determination module 820 is used to determine the grayscale compensation parameter of the pixel circuit according to the voltage drop parameter, the current grayscale value and the grayscale compensation information; wherein the grayscale compensation information is used to characterize the mapping relationship between the voltage drop parameter, the grayscale value of the pixel circuit and the grayscale compensation parameter.

[0125] The compensation module 830 is used to compensate the current grayscale value of the pixel circuit according to the grayscale compensation parameter.

[0126] It should be noted that the voltage drop compensation device for the display panel provided in the embodiment of the present application and the embodiment of the aforementioned voltage drop compensation method are based on the same inventive concept and can achieve the same effect. The specific implementation process can be found in the description in the embodiment of the aforementioned voltage drop compensation method, which will not be repeated here.

[0127] The present application also provides a display device. Fig. 9 , shows a schematic diagram of the structure of a display device according to an embodiment of the present application. The specific embodiment of the present application does not limit the specific implementation of the display device.

[0128] like Fig. 9 As shown, the display device may include: a processor (processor) 902 , a communication interface (Communications Interface) 904 , a memory (memory) 906 , and a communication bus 908 .

[0129] in:

[0130] The processor 902 , the communication interface 904 , and the memory 906 communicate with each other via a communication bus 908 .

[0131] The communication interface 904 is used to communicate with other electronic devices or servers.

[0132] The processor 902 is used to execute at least one computer software 910, which can specifically execute the relevant steps in the above-mentioned voltage drop compensation method embodiment.

[0133] The processor 902 may be a CPU, or an application specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application. The one or more processors included in the smart device may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0134] The memory 906 is used to store at least one computer software 910. The memory 906 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory.

[0135] The computer software 910 may include multiple computer instructions. The computer software 910 may specifically enable the processor 902 to perform operations corresponding to the voltage drop compensation method described in any of the aforementioned multiple method embodiments through multiple computer instructions. The specific implementation of each step in the computer software 910 can refer to the corresponding descriptions in the corresponding steps and units in the aforementioned method embodiments, and has corresponding beneficial effects, which are not repeated here. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the above-described devices and modules can refer to the corresponding process description in the aforementioned method embodiments, which is not repeated here.

[0136] The present application also provides a computer storage medium on which a computer program is stored, and when the program is executed by a processor, the method described in any of the above-mentioned multiple method embodiments is implemented. The storage medium includes, but is not limited to: a compact disc read-only memory (CD-ROM), a random access memory (RAM), a floppy disk, a hard disk, or a magneto-optical disk.

[0137] An embodiment of the present application also provides a computer program product, including computer instructions, which instruct a computing device to execute operations corresponding to the method described in any one of the aforementioned method embodiments.

[0138] It should be pointed out that, according to the needs of implementation, the various components / steps described in the embodiments of the present application can be split into more components / steps, or two or more components / steps or partial operations of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of the present application.

[0139] The above-mentioned method according to the embodiment of the present application can be implemented in hardware, firmware, or implemented as software or computer code that can be stored in a recording medium (such as a CD-ROM, RAM, floppy disk, hard disk or magneto-optical disk), or implemented as a computer code originally stored in a remote recording medium or a non-temporary machine-readable medium downloaded through a network and stored in a local recording medium, so that the method described herein can be stored in such software processing on a recording medium using a general-purpose computer, a dedicated processor or programmable or dedicated hardware (such as an application-specific integrated circuit (ASIC) or a field programmable gate array (FPGA)). It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component (e.g., a random access memory (RAM), a read-only memory (ROM), a flash memory, etc.) that can store or receive software or computer code, and when the software or computer code is accessed and executed by a computer, a processor or hardware, the method described herein is implemented. In addition, when a general-purpose computer accesses the code for implementing the method shown here, the execution of the code converts the general-purpose computer into a dedicated computer for executing the method shown here.

[0140] Those of ordinary skill in the art will appreciate that the units and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present application.

[0141] The above implementation methods are only used to illustrate the embodiments of the present application, and are not limitations on the embodiments of the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present application. The scope of patent protection of the embodiments of the present application should be limited by the claims.

Claims

1. A voltage drop compensation method, characterized in that: The method comprises: Acquire a current grayscale value of a pixel circuit and a voltage drop parameter of the pixel circuit, wherein the voltage drop parameter is used to indicate a voltage drop between a power source and the pixel circuit; Determine the grayscale compensation parameter of the pixel circuit according to the voltage drop parameter, the current grayscale value and the grayscale compensation information; wherein the grayscale compensation information is used to characterize the mapping relationship between the voltage drop parameter, the grayscale value of the pixel circuit and the grayscale compensation parameter; The current grayscale value of the pixel circuit is compensated according to the grayscale compensation parameter.

2. The method according to claim 1, characterized in that The voltage drop parameter includes a total current value of the pixel circuit on the display panel, and the grayscale compensation information is used to characterize a mapping relationship between the total current value, the grayscale value of the pixel circuit and the grayscale compensation parameter; Preferably, the pixel circuit includes pixel circuits of multiple colors, and the grayscale compensation information corresponding to the pixel circuits of different colors is different.

3. The method according to claim 2, characterized in that The method further comprises: obtaining the grayscale compensation information by the following steps: A loss conversion model is established using the voltage drop parameter as an input variable and a gamma voltage change corresponding to the voltage drop as an output variable; The grayscale compensation information is determined according to the loss conversion model and a first mapping model for characterizing a mapping relationship between a gamma voltage and a grayscale value of the pixel circuit.

4. The method according to claim 3, characterized in that: The loss conversion model is established by taking the voltage drop parameter as an input variable and the gamma voltage change amount corresponding to the voltage drop as an output variable, including: The loss conversion model is established by taking the total current value as an input variable and the gamma voltage variation corresponding to the voltage drop as an output variable according to a reference value of the total current value and a reference value of the gamma voltage variation; wherein the reference value of the gamma voltage variation is the value of the gamma voltage variation corresponding to the voltage drop when the total current value is the reference value of the total current value; Preferably, the reference value of the total current value is the maximum value of the total current, and the reference value of the gamma voltage variation is the maximum value of the gamma voltage variation.

5. The method according to claim 4, characterized in that The method further comprises: determining a reference value of the gamma voltage variation corresponding to the reference value of the total current value by the following steps: Acquire a first preset area and a second preset area of ​​the white area, where the first preset area is different from the second preset area; controlling the display panel to display a white area according to the first preset area and the second preset area at a maximum brightness level, and recording a total current of the pixel circuit in the display panel when the display panel displays the white area according to the first preset area and / or the second preset area; adjusting the gamma voltage when the display panel displays the white area according to the first preset area, so that the average brightness of the picture when the display panel displays the white area according to the first preset area is the same as the average brightness of the picture when the display panel displays the white area according to the second preset area, and recording the adjustment amount of the gamma voltage; A reference value of the gamma voltage variation corresponding to the reference value of the total current value is determined according to the first preset area, the second preset area, the adjustment amount, and the recorded total current.

6. The method according to claim 3, characterized in that The determining the grayscale compensation information according to the loss conversion model and a first mapping model for characterizing a mapping relationship between a gamma voltage and a grayscale value of the pixel circuit includes: Determining, according to the loss conversion model and the first mapping model, a second mapping model for characterizing a mapping relationship between the total current value, the grayscale value of the pixel circuit, and the grayscale compensation parameter; The second mapping model is determined as the grayscale compensation information; or, a mapping relationship table including the total current value, the grayscale value of the pixel circuit, and the grayscale compensation parameters corresponding to the total current value and the grayscale value of the pixel circuit is established according to the second mapping model, and the mapping relationship table is determined as the grayscale compensation information.

7. The method according to claim 3, characterized in that The method further comprises: obtaining the first mapping model by the following steps: The first mapping model corresponding to the pixel circuit is established according to a plurality of binding point grayscales of the pixel circuit and a gamma voltage corresponding to each of the binding point grayscales.

8. A voltage drop compensation device, characterized in that: include: An acquisition module, used to acquire a current grayscale value of each pixel circuit and a voltage drop parameter of the pixel circuit, wherein the voltage drop parameter is used to indicate a voltage drop between a power source and the pixel circuit; A compensation parameter determination module, used to determine the grayscale compensation parameter of the pixel circuit according to the voltage drop parameter, the current grayscale value and the grayscale compensation information; wherein the grayscale compensation information is used to characterize the mapping relationship between the voltage drop parameter, the grayscale value of the pixel circuit and the grayscale compensation parameter; A compensation module is used to compensate the current grayscale value of the pixel circuit according to the grayscale compensation parameter.

9. A display device, comprising: A processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one computer software, and the computer software enables the processor to execute the method according to any one of claims 1-7.

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