Method for improving gray scale gradual change smoothness of display panel, display panel and display device

Abstract

The invention discloses a display panel gray scale gradual change smoothness improving method, a display panel and a display device. The display panel gray scale gradual change smoothness improving method comprises the steps of obtaining a minimum data voltage initial value of the display panel and a preset gamma register value corresponding to a minimum data voltage target value of the display panel; calculating a minimum data voltage target value according to preset gamma register values corresponding to the maximum data voltage, the minimum data voltage initial value and the minimum data voltage target value of the display panel; according to the maximum data voltage target value and the minimum data voltage target value of the display panel and a mapping formula of data voltage and a register in brightness adjustment, gray scale voltage of each gray scale of the display panel is calculated so as to adjust a gamma curve of the display panel; and driving the display panel according to the adjusted gamma curve. According to the technical scheme provided by the invention, the smoothness of the gray scale gradual change picture of the display panel is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display, and in particular, to a method for improving smoothness of gray scale gradient of a display panel, a display panel and a display device. BACKGROUND

[0002] With the development of display technology, people have higher and higher requirements on picture display quality.

[0003] In the existing organic light emitting display panel, there is a problem of color deviation of a certain gray scale when the display panel displays a gray scale gradient picture, which affects the smoothness of the gray scale gradient picture of the display panel. SUMMARY

[0004] Embodiments of the present application provide a method for improving smoothness of gray scale gradient of a display panel, a display panel and a display device to improve the smoothness of the gray scale gradient picture of the display panel.

[0005] According to an aspect of the present application, a method for improving smoothness of gray scale gradient of a display panel is provided, comprising:

[0006] obtaining a minimum data voltage initial value of the display panel and a preset gamma register value corresponding to a minimum data voltage target value of the display panel;

[0007] calculating the minimum data voltage target value according to the maximum data voltage of the display panel, the minimum data voltage initial value and the preset gamma register value corresponding to the minimum data voltage target value;

[0008] calculating gray scale voltages of each gray scale of the display panel according to the maximum data voltage of the display panel, the minimum data voltage target value and a mapping formula of data voltage and register in brightness adjustment, so as to adjust the gamma curve of the display panel;

[0009] driving the display panel according to the adjusted gamma curve to improve the smoothness of the gray scale gradient of the display panel.

[0010] Optionally, before calculating the minimum data voltage target value according to the maximum data voltage of the display panel, the minimum data voltage initial value and the preset gamma register value corresponding to the minimum data voltage target value, the method further comprises:

[0011] determining the maximum data voltage of the display panel according to the preset minimum brightness of the display panel.

[0012] Optionally, determining the maximum data voltage of the display panel according to the preset minimum brightness of the display panel comprises:

[0013] Adjusting a data voltage input to the display panel, and detecting brightness of the display panel by a color analyzer, when the brightness of the display panel is less than or equal to 0.005 nits, determining that the data voltage input at this time is the maximum data voltage; wherein the preset minimum brightness is less than or equal to 0.005 nits.

[0014] Optionally, the minimum data voltage target value is calculated according to the maximum data voltage of the display panel, the preset gamma register value corresponding to the minimum data voltage initial value and the minimum data voltage target value, and is determined based on the following formula:

[0015] VGSP 目标 = VGMP - [Ga_numn * (VGMP - VGSP 初始 ) / Ga_with];

[0016] wherein, VGSP 目标 is the minimum data voltage target value, VGSP 初始 is the minimum data voltage initial value; VGMP is the maximum data voltage; Ga_numn is the preset gamma register value corresponding to the minimum data voltage target value; and Ga_with is the gamma node width.

[0017] Optionally, the display panel includes at least two sub-pixels of different light-emitting colors, and the gray scale voltages of the different color sub-pixels at the same gray scale are the same.

[0018] Optionally, the method for improving the smoothness of the display panel gray scale gradient further includes:

[0019] Adjusting the aperture ratio of the different color sub-pixels in the display panel based on the brightness decay rate of the different color sub-pixels.

[0020] Determining the light-emitting efficiency of the different light-emitting color sub-pixels and the brightness components of the different light-emitting color sub-pixels when the display panel displays a white picture.

[0021] Calculating the width-length ratio proportion of the driving transistor in the different color sub-pixels according to the aperture ratio proportion, the light-emitting efficiency proportion and the brightness component proportion of the different color sub-pixels.

[0022] Adjusting the width-length ratio of the driving transistor in the corresponding color sub-pixel in the display panel according to the width-length ratio proportion of the driving transistor in the different color sub-pixels.

[0023] Optionally, the display panel includes red sub-pixels, green sub-pixels and blue sub-pixels.

[0024] Adjusting the aperture ratio of the different color sub-pixels in the display panel based on the brightness decay rate of the different color sub-pixels includes:

[0025] adjusting the aperture ratio of the red sub-pixel, the aperture ratio of the green sub-pixel and the aperture ratio of the blue sub-pixel in the display panel based on the luminance decay rates of the red sub-pixel, the green sub-pixel and the blue sub-pixel;

[0026] determining the luminous efficiency of the sub-pixels of different light-emitting colors and the luminance components of the sub-pixels of different light-emitting colors when the display panel displays a white picture, comprising:

[0027] determining the luminous efficiency Er of the red sub-pixel, the luminous efficiency Eg of the green sub-pixel and the luminous efficiency Eb of the blue sub-pixel, and the luminance component Lr of the red sub-pixel, the luminance component Lg of the green sub-pixel and the luminance component Lb of the blue sub-pixel when the display panel displays a white picture of a preset display gray scale;

[0028] calculating the ratio of the width-length ratio of the driving transistor in the sub-pixels of different colors according to the aperture ratio ratio, the luminous efficiency ratio and the luminance component ratio of the sub-pixels of different colors, and determining based on the following:

[0029]

[0030] wherein Kr is the width-length ratio of the driving transistor in the red sub-pixel, Kg is the width-length ratio of the driving transistor in the green sub-pixel, and Kb is the width-length ratio of the driving transistor in the blue sub-pixel; Ar is the adjusted aperture ratio of the red sub-pixel, Ag is the adjusted aperture ratio of the green sub-pixel, and Ab is the adjusted aperture ratio of the blue sub-pixel.

[0031] Optionally, the luminance component Lr of the red sub-pixel, the luminance component Lg of the green sub-pixel and the luminance component Lb of the blue sub-pixel when the display panel displays a white picture of a preset display gray scale are determined, comprising:

[0032] obtaining the target color coordinates of the white picture of the display panel and the respective color coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel when displaying the white picture;

[0033] calculating the luminance component Lr of the red sub-pixel, the luminance component Lg of the green sub-pixel and the luminance component Lb of the blue sub-pixel when the display panel displays a white picture of a preset display gray scale according to the target luminance of the display panel when displaying a white picture of a preset gray scale, the target color coordinates of the white picture and the respective color coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel when displaying the white picture.

[0034] According to another aspect of the present application, there is provided a display panel, the smoothness of gray scale gradation of which is improved by the method for improving the smoothness of gray scale gradation of the display panel according to any one of the embodiments of the present application.

[0035] According to another aspect of the present application, there is provided a display device comprising the display panel of any of the embodiments of the present application.

[0036] The embodiment of the present application provides a display panel gray scale gradual change smoothness improving method, a display panel and a display device, wherein the display panel gray scale gradual change smoothness improving method comprises the following steps: obtaining a minimum data voltage initial value of a display panel and a preset gamma register value corresponding to a minimum data voltage target value of the display panel; calculating the minimum data voltage target value according to a maximum data voltage of the display panel, the minimum data voltage initial value and the preset gamma register value corresponding to the minimum data voltage target value; calculating gray scale voltages of each gray scale of the display panel according to the maximum data voltage of the display panel, the minimum data voltage target value and a mapping formula of data voltage and register in brightness adjustment, so as to adjust a gamma curve of the display panel; and driving the display panel according to the adjusted gamma curve. The technical scheme provided by the present application adjusts the minimum data voltage of the display panel, reduces the difference between the maximum data voltage and the minimum data voltage, thereby reducing the size of each part of data voltage divided according to the brightness level, increasing the accuracy in the color scale debugging process, and improving the smoothness of the gray scale gradual change picture of the display panel.

[0037] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0039] Figure 1 is a display picture schematic diagram of a display panel provided in the prior art;

[0040] Figure 2 is a color coordinate and gray scale relationship schematic diagram of a display panel provided in the prior art;

[0041] Figure 3 is a flow chart of a display panel gray scale gradual change smoothness improving method provided in the embodiment of the present application;

[0042] Figure 4 is a display picture schematic diagram of a display panel provided in the embodiment of the present application;

[0043] Figure 5is a flowchart of another method for improving the smoothness of gray scale gradation of a display panel provided by an embodiment of the present application;

[0044] Figure 6 is a flowchart of another method for improving the smoothness of gray scale gradation of a display panel provided by an embodiment of the present application;

[0045] Figure 7 is a structural schematic diagram of a display device provided by an embodiment of the present application;

[0046] Figure 8 is a connection schematic diagram of a driving transistor and a light emitting device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a 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 without creative efforts should fall within the scope of the present application.

[0048] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to the process, method, product, or device.

[0049] As in the background art, with the development of display technology, people have higher and higher requirements for picture display quality. Figure 1 is a display picture schematic diagram of a display panel provided in the prior art, Figure 2 is a color coordinate and gray scale relationship schematic diagram of a display panel provided in the prior art, for reference Figure 1 and Figure 2 In the existing organic light emitting display panel, there is a problem of color deviation of a certain gray scale when the display panel displays a gray scale gradation picture, which is caused by the fact that the color coordinates of the node are slightly red or slightly blue. Figure 2Two curves in the figure are respectively color coordinate x and color coordinate y and the relationship of gray scale. In an ideal state, color coordinate x of different gray scales is the same, and color coordinate y of different gray scales is the same. The applicant found that the reason for the color deviation of the display panel at a certain gray scale when displaying a gray scale gradient picture is that the color card control range in the color card debugging process is too large. Specifically, for example, the total number of data voltage Vdata of the display panel is 1024, which means that the voltage difference between the maximum data voltage and the minimum data voltage of the display panel is divided into 1024 parts. If the voltage range of the voltage difference between the maximum data voltage and the minimum data voltage is large, the voltage of each equal part is large, so that the color card range controlled by each equal part of voltage is large, which leads to the color card control range being too large, reduces the debugging precision, and thus causes the display panel to have a gray scale with color deviation, and further affects the smoothness of the gray scale gradient picture of the display panel, and reduces the product qualification rate.

[0050] In view of this, the embodiment of the present application provides a display panel gray scale gradient smoothness improvement method, Figure 3 is a flow chart of a display panel gray scale gradient smoothness improvement method provided by the embodiment of the present application, referring to Figure 3 The display panel gray scale gradient smoothness improvement method comprises:

[0051] S10, obtaining the minimum data voltage initial value of the display panel and the preset gamma register value corresponding to the minimum data voltage target value of the display panel.

[0052] S20, calculating the minimum data voltage target value according to the maximum data voltage of the display panel, the minimum data voltage initial value and the preset gamma register value corresponding to the minimum data voltage target value.

[0053] S30, calculating the gray scale voltage of each gray scale of the display panel according to the maximum data voltage of the display panel, the minimum data voltage target value and the mapping formula of data voltage and register in brightness adjustment, so as to adjust the gamma curve of the display panel.

[0054] S40, driving the display panel according to the adjusted gamma curve, so as to improve the smoothness of the gray scale gradient of the display panel.

[0055] Specifically, the display panel can be an OLED display panel, or can be other display panels that need to be gamma adjusted. The gamma curve of the display panel is an important parameter of the display panel representing the optical brightness and the electrical signal response characteristics. The adjustment of the display brightness of the display panel can be realized by adjusting the gamma curve of the display panel. The voltage value corresponding to each node gray scale value in the gamma curve is one-to-one corresponding to the storage value in the OLED module register. Therefore, the gamma curve can represent the corresponding relationship between the voltage value of each node gray scale value and the gray scale value, or can represent the corresponding relationship between the storage value (gamma register value) in the OLED module register and the gray scale value.

[0056] The minimum data voltage of the display panel is the minimum voltage value recorded in the register in the data voltage domain, and the maximum data voltage of the display panel is the maximum voltage value recorded in the register in the data voltage domain. The data voltage domain is a voltage dimming interval for controlling the display brightness, and the data voltage domain corresponds to a display brightness level interval. The minimum value of the data voltage, i.e., the minimum data voltage (VGSP), corresponds to the minimum value of the display brightness level, and the maximum value of the data voltage, i.e., the maximum data voltage (VGMP), corresponds to the maximum value of the display brightness level. Alternatively, the minimum value of the data voltage corresponds to the maximum value of the display brightness level, and the maximum value of the data voltage corresponds to the minimum value of the display brightness level. Wherein, the greater the display brightness level, the greater the brightness of the display panel. For ease of understanding and description, the minimum value of the data voltage corresponds to the maximum value of the display brightness level, and the maximum value of the data voltage corresponds to the minimum value of the display brightness level in the following embodiments of the present application.

[0057] Exemplarily, the number of bits of the node gray scale value Gray is set to 8 bits, i.e., there are 256 node gray scale values in the Gamma orientation. The gamma register value Data in the OLED module register is exemplarily represented by 10 bits, and the value range of the gamma register value Data is 0-1023, i.e., there are 1024 values, and the gamma node width is 1024. According to the maximum data voltage, the minimum data voltage and the gamma register value Data of the display panel, the data voltage Vdata corresponding to each gamma register value Data is calculated, and is determined based on the following formula:

[0058] Vdata=VGMP-[data*(VGMP-VGSP) / 1024];

[0059] In the related art, the difference between the maximum data voltage VGMP and the minimum data voltage VGSP of the display panel is large, and after the voltage difference between the maximum data voltage VGMP and the minimum data voltage VGSP of the display panel is split into 1024 parts, the voltage of each part is large, so that the color scale range controlled by each part of voltage is large, which leads to a large color scale control range, reduces the debugging accuracy, and causes the display panel to have a gray scale with color deviation. Therefore, in the embodiment of the present application, the difference between the maximum data voltage VGMP and the minimum data voltage VGSP is reduced by adjusting the minimum data voltage, and then the size of each part of data voltage divided according to the brightness level is reduced, and the accuracy in the color scale debugging process is increased.

[0060] wherein the minimum data voltage initial value is the minimum data voltage before adjustment, and the minimum data voltage target value is the minimum data voltage after adjustment. The preset gamma register value corresponding to the minimum data voltage target value of the display panel is a gamma register value set according to requirements. In the embodiment of the present application, the way to adjust the minimum data voltage of the display panel is:

[0061] taking the minimum data voltage initial value of the display panel and the preset gamma register value corresponding to the minimum data voltage target value of the display panel; calculating the minimum data voltage target value according to the maximum data voltage of the display panel, the minimum data voltage initial value and the preset gamma register value corresponding to the minimum data voltage target value. Wherein the minimum data voltage target value is calculated according to the maximum data voltage of the display panel, the minimum data voltage initial value and the preset gamma register value corresponding to the minimum data voltage target value, which is determined based on the following formula:

[0062] VGSP 目标 = VGMP - [Ga_numn*(VGMP-VGSP 初始 ) / Ga_with];

[0063] wherein VGSP 目标 is the minimum data voltage target value, VGSP 初始 is the minimum data voltage initial value; VGMP is the maximum data voltage; Ga_numn is the preset gamma register value corresponding to the minimum data voltage target value; and Ga_with is the gamma node width. For example, the gamma node width Ga_with is 1024, and the preset gamma register value corresponding to the minimum data voltage target value VGSP 目标 is 900.

[0064] After the minimum data voltage of the display panel is adjusted, the data voltage corresponding to each gamma register value is calculated according to the maximum data voltage of the display panel, the minimum data voltage target value, and the mapping formula of the data voltage and the gamma register value in the brightness adjustment. Still taking the gamma node width Ga_with as 1024 as an example, the data voltage corresponding to each gamma register value is calculated according to the maximum data voltage of the display panel, the minimum data voltage target value, and the mapping formula of the data voltage and the gamma register value in the brightness adjustment, which is determined based on the following:

[0065] Vdata=VGMP-[data*(VGMP-VGSP 目标 ) / 1024]。

[0066] According to the preset brightness of each gray scale in 0-255 gray scales, the data voltage corresponding to each gray scale, that is, the corresponding gray scale voltage, is determined, and the gamma register value corresponding to each gray scale is stored. Thus, the gamma curve of the display panel is adjusted, and the display panel is driven according to the adjusted gamma curve in the process of driving the display panel. Figure 4 is a display screen schematic diagram of a display panel provided by an embodiment of the present application, compared with Figure 4 and Figure 1 , the display effect of the display panel is improved through the display panel gray scale gradual change smoothness improvement method provided by the embodiment of the present application.

[0067] The display panel gray scale gradual change smoothness improvement method provided by the embodiment of the present application adjusts the minimum data voltage of the display panel, reduces the difference between the maximum data voltage and the minimum data voltage, thereby reducing the size of each part of the data voltage divided according to the brightness level, increasing the accuracy in the color scale debugging process, preventing the display panel from appearing color deviation phenomenon, and thus improving the smoothness of the gray scale gradual change picture of the display panel.

[0068] On the basis of the above-mentioned embodiments, in an embodiment of the present application, Figure 5 is a flow chart of another display panel gray scale gradual change smoothness improvement method provided by an embodiment of the present application, referring to Figure 5 , step S20 calculates the preset gamma register value corresponding to the maximum data voltage of the display panel, the minimum data voltage initial value, and the minimum data voltage target value, and before the minimum data voltage target value, further comprising:

[0069] S020, according to the preset minimum brightness of the display panel, the maximum data voltage of the display panel is determined.

[0070] Specifically, the step S020 can be arranged before the step S10 or arranged after the step S10, and the embodiment of the present application exemplarily shows that the step S020 is arranged before the step S10. When the sub-pixel in the display panel inputs the maximum data voltage VGMP, the display panel can realize the minimum brightness in the brightness level. In the embodiment of the present application, the maximum data voltage VGMP of the display panel is determined according to the preset minimum brightness of the display panel, wherein the preset minimum brightness of the display panel can be set according to requirements.

[0071] Optionally, the maximum data voltage VGMP of the display panel is determined according to the preset minimum brightness of the display panel, comprising:

[0072] adjusting the data voltage input to the display panel, and detecting the brightness of the display panel through the color analyzer, when the brightness of the display panel is less than or equal to 0.005 nits, determining that the data voltage input at this time is the maximum data voltage VGMP; wherein the preset minimum brightness is less than or equal to 0.005 nits.

[0073] Optionally, if the gray scale range of the display panel is 0-255, the maximum data voltage VGMP is the data voltage corresponding to the gamma register value of 0; and the minimum data voltage target value VGSP 目标 is the data voltage corresponding to the 255 gray scale (i.e. gray scale voltage). It should be noted that the brightness corresponding to 0 gray scale can be equal to the minimum brightness that the display panel can realize, or can not be equal.

[0074] On the basis of the above-mentioned embodiments, in an embodiment of the present application, the display panel comprises at least two sub-pixels of different colors, and the gray scale voltage (data voltage) of the different color sub-pixels at the same gray scale is the same.

[0075] It can be understood that the same set of gray scale voltage settings is used for the sub-pixels of different colors in the display panel, so as to reduce the difficulty of determining the gray scale voltage and reduce the storage amount of the gamma register value. In order to make the same set of gray scale voltage settings be used for the sub-pixels of different colors in the display panel, the aperture ratio of the sub-pixels in the display panel and the width-length ratio of the driving transistor in the sub-pixel need to be adjusted.

[0076] Therefore, Figure 6 is a flow chart of another display panel gray scale gradual change smoothness improvement method provided by the embodiment of the present application, and reference is made to Figure 6 , the display panel gray scale gradual change smoothness improvement method further comprises:

[0077] S101, determining the aperture ratio of the different color sub-pixels in the display panel based on the brightness decay rate of the different color sub-pixels.

[0078] S102: Determine the luminous efficiency of sub-pixels of different luminous colors and the brightness components of sub-pixels of different luminous colors when the display panel displays a white image.

[0079] S103 , calculating the ratio of the width-to-length ratios of the driving transistors in the sub-pixels of different colors according to the ratio of the aperture ratios, the ratio of the luminous efficiency, and the ratio of the brightness components of the sub-pixels of different colors.

[0080] S104. Adjust the aspect ratio of the driving transistors in the corresponding color sub-pixels in the display panel according to the ratio of the aspect ratio of the driving transistors in the different color sub-pixels, and adjust the aperture ratio of the different color sub-pixels in the display panel according to the determined aperture ratio of the different color sub-pixels in the display panel.

[0081] Steps S101 to S104 provide some preparation parameters for preparing the display panel, while steps S10 to S40 are the process of debugging the display parameters of the display panel after the display panel is prepared.

[0082] Specifically, Figure 7 is a schematic structural diagram of a display device provided by an embodiment of the present invention, with reference to Figure 7 , the display device includes a display panel and Figure 7 The scan drive circuit 100, the light emitting control drive circuit 200 and the drive chip 300 shown are shown. The display panel includes an array substrate and a light emitting structure layer arranged on the array substrate. The array substrate refers to a film structure that can provide a drive signal for the display panel and play a role of buffering, protection or support, which includes a substrate and a drive circuit layer arranged on the substrate. The drive circuit layer includes multiple circuit units, multiple data signal lines (D1 to Dn), multiple scan signal lines (S1 to Sm), multiple light emitting control signal lines (E1 to Eo) and multiple power lines. The drive chip 300 is respectively connected to the multiple data signal lines (D1 to Dn), the scan drive circuit 100 is respectively connected to the multiple scan signal lines (S1 to Sm), and the light emitting control drive circuit 200 is respectively connected to the multiple light emitting control signal lines (E1 to Eo).

[0083] The light-emitting structure layer includes a plurality of light-emitting devices, the circuit unit and the light-emitting device connected with the circuit unit constitute a sub-pixel. The display area can include a plurality of sub-pixels Pxij, i and j can be natural numbers. The circuit unit can at least include a pixel circuit, the pixel circuit is connected with a scan signal line, a light-emitting control signal line and a data signal line respectively. The data signal line is configured to provide a data voltage to the pixel circuit, the scan signal line is configured to provide a scan signal to the pixel circuit, and the light-emitting control signal line is configured to provide a light-emitting control signal to the pixel circuit, so as to realize light-emitting control of the light-emitting device. The pixel circuit can be a "7T1C" circuit in the prior art, or a "9T1C" circuit. It can also be a pixel circuit with other number of thin film transistors and other number of capacitors.

[0084] The thin film transistor in the pixel circuit includes a driving transistor, Figure 8 is a schematic diagram of the connection between the driving transistor and the light-emitting device provided by the embodiment of the application, referring to Figure 8 , only the connection relationship between the driving transistor T2 in the pixel circuit and the light-emitting device OLED is shown, the driving transistor T2 is used to generate a driving current (I OLED ) according to the input data voltage Vdata, and drive the light-emitting device OLED to emit light. The first electrode of the driving transistor T2 inputs a first voltage signal ELVDD, the gate electrode of the driving transistor T2 inputs the data voltage Vdata, the second electrode of the driving transistor T2 is electrically connected with the anode of the light-emitting device OLED, and the cathode of the light-emitting device inputs a second voltage signal ELVSS.

[0085] Optionally, the display panel can include red sub-pixels emitting red light, green sub-pixels emitting green light and blue sub-pixels emitting blue light. Then, the step S101 adjusts the aperture ratio of different color sub-pixels in the display panel based on the luminance decay rate of the different color sub-pixels, including:

[0086] Based on the luminance decay rates of the red sub-pixels R, the green sub-pixels G and the blue sub-pixels B, the aperture ratio Ar of the red sub-pixels R, the aperture ratio Ag of the green sub-pixels G and the aperture ratio Ab of the blue sub-pixels B in the display panel are adjusted. For example, according to the measured life ability of R\G\B, Ar:Ag:Ab=1:1.5:2 is determined.

[0087] The step S102 determines the luminous efficiency of different light-emitting color sub-pixels, and the luminance component of different light-emitting color sub-pixels when the display panel displays a white picture, including:

[0088] Determine the luminous efficiency Er of the red sub-pixel R, the luminous efficiency Eg of the green sub-pixel G, and the luminous efficiency Eb of the blue sub-pixel B, and the luminance component Lr of the red sub-pixel R, the luminance component Lg of the green sub-pixel G, and the luminance component Lb of the blue sub-pixel B when the display panel displays a white picture of a preset display gray scale.

[0089] Wherein, the luminous efficiency of different light-emitting color sub-pixels can be calculated according to the ratio of the light-emitting intensity to the input current. When determining the ratio between the luminous efficiency of different light-emitting color sub-pixels, the same current can be input to the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B, and the light-emitting intensity of the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B is detected respectively.

[0090] Determine the luminance component Lr of the red sub-pixel R, the luminance component Lg of the green sub-pixel G, and the luminance component Lb of the blue sub-pixel B when the display panel displays a white picture of a preset display gray scale, which can specifically include: obtaining the target color coordinates of the white picture of the display panel, and the respective color coordinates of the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B when displaying the white picture; according to the target luminance of the display panel when displaying a white picture of a preset gray scale, the target color coordinates of the white picture, and the respective color coordinates of the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B when displaying the white picture, calculate the luminance component Lr of the red sub-pixel R, the luminance component Lg of the green sub-pixel G, and the luminance component Lb of the blue sub-pixel B when the display panel displays a white picture of a preset display gray scale.

[0091] For example, it is known that Y C = 350, x C = 0.30, y C = 0.31; x R = 0.66, y R = 0.33; x G = 0.21, y G = 0.72; x B = 0.13, y B = 0.06; these parameters are brought into the following equation set, and the equation set is solved to obtain the luminance component Lr of the red sub-pixel R, the luminance component Lg of the green sub-pixel G, and the luminance component Lb of the blue sub-pixel B.

[0092]

[0093] Y C = Y R + Y G + Y B ;

[0094]

[0095] wherein Y C is the target luminance of the display panel when displaying a white picture at a preset gray scale, x C and y C are the target color coordinates of the white picture; x R and y R are the target color coordinates of the red sub-pixel R; x G and y G are the target color coordinates of the green sub-pixel G; x B and y B are the target color coordinates of the blue sub-pixel B. Y R , Y G , Y B are the luminance components of the red sub-pixel, the green sub-pixel and the blue sub-pixel respectively, i.e. Lr, Lg and Lb respectively. X C , Y C , Z C represent the tristimulus values of the white light. In the white picture of different gray scales, the proportions of the luminance component Lr of the red sub-pixel R, the luminance component Lg of the green sub-pixel G and the luminance component Lb of the blue sub-pixel B are the same, and the luminance component Lr of the red sub-pixel R, the luminance component Lg of the green sub-pixel G and the luminance component Lb of the blue sub-pixel B in a preset gray scale are calculated, and the obtained proportion is Lr:Lg:Lb.

[0096] Step S103 calculates the proportion (Kr:Kg:Kb) of the width-length ratio of the driving transistor in different color sub-pixels according to the proportion of the aperture ratio (Ar:Ag:Ab), the proportion of the luminance component (Lr:Lg:Lb) and the proportion of the luminous efficiency (Er:Eg:Eb) of different color sub-pixels, and determines based on the following formula:

[0097]

[0098] wherein Kr is the width-length ratio (W / L) of the driving transistor in the red sub-pixel, Kg is the width-length ratio (W / L) of the driving transistor in the green sub-pixel, and Kb is the width-length ratio (W / L) of the driving transistor in the blue sub-pixel. It should be noted that the display panel used for data detection in steps S101-S104 is different from the display panel used for gamma curve debugging in steps S10-S40. The display panel used for gamma curve debugging in steps S10-S40 is the display panel adjusted based on the aperture ratio and the proportion of the width-length ratio of the driving transistor determined in steps S101-S104.

[0099] The method for improving the smoothness of gray scale gradual change of the display panel provided by the embodiment of the present application adjusts the minimum data voltage of the display panel, reduces the difference between the maximum data voltage and the minimum data voltage, thereby reducing the size of each data voltage divided according to the brightness level, increasing the accuracy in the color scale debugging process, preventing the display panel from having color deviation, and improving the smoothness of the gray scale gradual change picture of the display panel. Furthermore, based on this, the aperture ratio of different color sub-pixels in the display panel is adjusted based on the brightness decay rate of the different color sub-pixels; and the width-length ratio of the driving transistor in the corresponding color sub-pixel in the display panel is adjusted according to the proportion of the width-length ratio of the driving transistor in the different color sub-pixels. The same set of gray scale voltage settings is used for the different color sub-pixels in the display panel, thereby reducing the difficulty in determining the gray scale voltage and reducing the storage amount of the gamma register value.

[0100] The present application has found that, in the prior art, for the red sub-pixel R and the green sub-pixel G, the utilization rate of the effective gamma register value Data in the range (300-700) of the gamma register value is 40%; by using the method for improving the smoothness of gray scale gradual change of the display panel provided by the embodiment of the present application, for the red sub-pixel R and the green sub-pixel G, the utilization rate of the effective gamma register value Data in the range (100-900) of the gamma register value is 80%, the utilization efficiency of the gamma register value Data is doubled, and the display panel failure rate is reduced from 5% to less than or equal to 0.1%.

[0101] The embodiment of the present application also provides a display panel, the smoothness of gray scale gradual change of which is improved by using the method for improving the smoothness of gray scale gradual change of the display panel provided by any of the embodiments of the present application.

[0102] Optionally, the aperture ratios of the different color sub-pixels in the display panel satisfy the aperture ratio proportion determined based on the brightness decay rate of the different color sub-pixels. The aperture ratio Ar of the red sub-pixel R, the aperture ratio Ag of the green sub-pixel G, and the aperture ratio Ab of the blue sub-pixel B satisfy Ar:Ag:Ab=1:1.5:2. The width-length ratio Kr of the driving transistor in the red sub-pixel R, the width-length ratio Kg of the driving transistor in the green sub-pixel G, and the width-length ratio Kb of the driving transistor in the blue sub-pixel B satisfy Kr:Kg:Kb=1:1.5:2.

[0103] Reference Figure 7 The embodiment of the present application also provides a display device comprising the display panel provided by any of the embodiments of the present application. The display device has the same technical effects, and thus will not be described here.

[0104] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications and substitutions can be made to the present application without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A method for improving the smoothness of gray scale transition of a display panel, characterized in that, The method comprises the following steps: obtaining the minimum data voltage initial value of the display panel and the preset gamma register value corresponding to the minimum data voltage target value of the display panel; calculating the minimum data voltage target value according to the maximum data voltage of the display panel, the minimum data voltage initial value and the preset gamma register value corresponding to the minimum data voltage target value; calculating the gray scale voltage of each gray scale of the display panel according to the maximum data voltage of the display panel, the minimum data voltage target value and the mapping formula of the data voltage and the gamma register value in the brightness adjustment, so as to adjust the gamma curve of the display panel; driving the display panel according to the adjusted gamma curve, so as to improve the smoothness of the gray scale transition of the display panel.

2. The method of claim 1, wherein the method further comprises: Before calculating the minimum data voltage target value according to the maximum data voltage of the display panel, the minimum data voltage initial value and the preset gamma register value corresponding to the minimum data voltage target value, the method further comprises the following steps: determining the maximum data voltage of the display panel according to the preset minimum brightness of the display panel.

3. The method of claim 2, wherein the method further comprises: The method for determining the maximum data voltage of the display panel according to the preset minimum brightness of the display panel comprises the following steps: adjusting the data voltage input to the display panel, and detecting the brightness of the display panel by using a color analyzer; when the brightness of the display panel is less than or equal to 0.005 nits, the data voltage input at this time is determined as the maximum data voltage; wherein the preset minimum brightness is less than or equal to 0.005 nits.

4. The method of claim 1, wherein the display panel is a liquid crystal display panel. The minimum data voltage target value is calculated according to the maximum data voltage of the display panel, the minimum data voltage initial value and the preset gamma register value corresponding to the minimum data voltage target value, and is determined based on the following formula: VGSP 目标 = VGMP - [Ga_numn * (VGMP - VGSP 初始 ) / Ga_with]; VGSP 目标 is a minimum data voltage target value, VGSP 初始 is a minimum data voltage initial value; VGMP is a maximum data voltage; Ga_numn is a preset gamma register value corresponding to the minimum data voltage target value; and Ga_with is a gamma node width.

5. The method of claim 1, wherein the method further comprises: The display panel comprises at least two kinds of sub-pixels of different emitting colors, and the gray scale voltages of different color sub-pixels at the same gray scale are the same.

6. The method of claim 5, wherein the method further comprises: The method further comprises the following steps: adjusting the aperture ratio of different color sub-pixels in the display panel based on the brightness decay rate of different color sub-pixels; determining the light emitting efficiency of different color sub-pixels and the brightness component of different color sub-pixels when the display panel displays a white picture; calculating the width-length ratio proportion of the driving transistor in different color sub-pixels according to the aperture ratio proportion, the light emitting efficiency proportion and the brightness component proportion of different color sub-pixels; adjusting the width-length ratio of the driving transistor in the corresponding color sub-pixel in the display panel according to the width-length ratio proportion of the driving transistor in different color sub-pixels.

7. The method of claim 6, wherein the method further comprises: determining a first grayscale value of a first pixel in the first frame; determining a second grayscale value of a second pixel in the second frame; and determining a third grayscale value of a third pixel in the third frame. The display panel comprises red sub-pixels, green sub-pixels and blue sub-pixels; The method for adjusting the aperture ratio of different color sub-pixels in the display panel based on the brightness decay rate of different color sub-pixels comprises the following steps: adjusting the aperture ratio of the red sub-pixel, the aperture ratio of the green sub-pixel and the aperture ratio of the blue sub-pixel in the display panel based on the brightness decay rate of the red sub-pixel, the green sub-pixel and the blue sub-pixel; The method for determining the light emitting efficiency of different color sub-pixels and the brightness component of different color sub-pixels when the display panel displays a white picture comprises the following steps: determine the luminous efficiency Er of the red sub-pixel, the luminous efficiency Eg of the green sub-pixel, and the luminous efficiency Eb of the blue sub-pixel, and the luminance component Lr of the red sub-pixel, the luminance component Lg of the green sub-pixel, and the luminance component Lb of the blue sub-pixel when the display panel displays a white picture of a preset display gray scale; According to the aperture ratio proportion, the luminous efficiency proportion and the luminance component proportion of different color sub-pixels, the proportion of the width-length ratio of the driving transistor in different color sub-pixels is calculated, and is determined based on the following: Wherein, Kr is the width-length ratio of the driving transistor in the red sub-pixel, Kg is the width-length ratio of the driving transistor in the green sub-pixel; Kb is the width-length ratio of the driving transistor in the blue sub-pixel; Ar is the adjusted aperture ratio of the red sub-pixel, Ag is the adjusted aperture ratio of the green sub-pixel, and Ab is the adjusted aperture ratio of the blue sub-pixel.

8. The method of claim 7, wherein the method further comprises: Determine the luminance component Lr of the red sub-pixel, the luminance component Lg of the green sub-pixel, and the luminance component Lb of the blue sub-pixel when the display panel displays a white picture of a preset display gray scale, comprising: Obtain the target color coordinates of the white picture of the display panel, and the respective color coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel when displaying the white picture; According to the target luminance of the display panel when displaying a white picture under a preset gray scale, the target color coordinates of the white picture, and the respective color coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel when displaying the white picture, calculate the luminance component Lr of the red sub-pixel, the luminance component Lg of the green sub-pixel, and the luminance component Lb of the blue sub-pixel when the display panel displays a white picture of a preset display gray scale.

9. A display panel, characterized by, The smoothness of gray scale gradation is improved by the display panel gray scale gradation smoothness improvement method of any one of claims 1-8.

10. A display device, characterized by comprising: The display panel comprises the display panel of claim 9. The display panel comprises the display panel of claim 9.

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