Brightness adjustment method of display panel and electronic device

Abstract

Embodiments of the present disclosure provide a display panel brightness adjustment method, an electronic device and a computer readable storage medium, relating to the technical field of display, and used for reducing the brightness difference between a main display area and a transparent display area when displaying the same gray scale. The brightness adjustment method comprises: performing gamma correction on the main display area to obtain a first gamma correction parameter, the first gamma correction parameter being used to drive pixels of the main display area to display; and obtaining a second gamma correction parameter according to the first gamma correction parameter, the second gamma correction parameter being used to drive pixels of the transparent display area to display. Wherein, the first gamma correction parameter and the second gamma correction parameter make the brightness difference between the main display area and the transparent display area when displaying the same gray scale within a preset range. The display panel brightness adjustment method, the electronic device and the computer readable storage medium are used for displaying images.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a display panel brightness adjustment method, an electronic device and a computer readable storage medium. BACKGROUND

[0002] In the field of display, OLED (Organic Light-Emitting Diode) display devices have the characteristics of self-luminous, wide viewing angle, fast response, etc., and are widely used. In order to make the display effect of the OLED display device meet the visual perception of the human eye, gamma correction needs to be performed on the OLED display device. SUMMARY

[0003] The purpose of the embodiments of the present disclosure is to provide a display panel brightness adjustment method, an electronic device and a computer readable storage medium, which are used to reduce the brightness difference between the main display area and the transparent display area when displaying the same gray scale.

[0004] To achieve the above-mentioned purpose, the embodiments of the present disclosure provide the following technical solutions:

[0005] In one aspect, a display panel brightness adjustment method is provided. The display panel has a display area, and the display area includes a main display area and a transparent display area. The light transmittance of the transparent display area is greater than the light transmittance of the main display area. The brightness adjustment method includes: performing gamma correction on the main display area to obtain a first gamma correction parameter, the first gamma correction parameter being used to drive the pixels of the main display area to display; and obtaining a second gamma correction parameter according to the first gamma correction parameter, the second gamma correction parameter being used to drive the pixels of the transparent display area to display. The first gamma correction parameter and the second gamma correction parameter make the brightness difference between the main display area and the transparent display area within a preset range when displaying the same gray scale.

[0006] The display panel brightness adjustment method provided by some embodiments of the present disclosure can make the main display area and the transparent display area display according to different gamma correction parameters, reduce the brightness difference between the main display area and the transparent display area when displaying the same gray scale, avoid increasing the difficulty and cost of mask manufacturing in the backplane manufacturing process of the display panel, save the wiring space of the pixel driving circuit in the backplane of the display panel, and be conducive to the improvement of the pixel density of the display panel. In addition, the above-mentioned brightness adjustment method only uses one gamma debugging device, so the gamma correction process can be simplified, the gamma correction time can be shortened, the production efficiency can be improved, and the cost of the display panel manufacturer can be avoided.

[0007] In some embodiments, the display panel has a plurality of reference display brightness levels, the main display area corresponds to a plurality of groups of the first gamma correction parameters, the transparent display area corresponds to a plurality of groups of the second gamma correction parameters, each of the reference display brightness levels corresponds to a group of the first gamma correction parameters and a group of the second gamma correction parameters. The obtaining the second gamma correction parameters according to the first gamma correction parameters comprises: respectively obtaining a first luminance value curve and a second luminance value curve, the first luminance value curve representing a corresponding relationship between the reference display brightness levels and luminance values of the main display area, the second luminance value curve representing a corresponding relationship between the reference display brightness levels and luminance values of the transparent display area; obtaining a display brightness level compensation curve according to the first luminance value curve and the second luminance value curve, the display brightness level compensation curve representing a corresponding relationship between the reference display brightness levels and compensated display brightness levels of the transparent display area, the luminance values corresponding to the corresponding reference display brightness level and compensated display brightness level being the same; for each of the reference display brightness levels, obtaining a compensated display brightness level corresponding to the reference display brightness level according to the display brightness level compensation curve, finding a group of gamma correction parameters corresponding to a reference display brightness level having the same value as the compensated display brightness level from the plurality of groups of the first gamma correction parameters as a group of the second gamma correction parameters corresponding to the reference display brightness level of the transparent display area.

[0008] In some embodiments, the display panel is capable of displaying a plurality of gray scales at each of the reference display brightness levels. The respectively obtaining a first luminance value curve and a second luminance value curve comprises: respectively testing luminance values of the main display area at a target gray scale and luminance values of the transparent display area at the target gray scale at each of the reference display brightness levels, the target gray scale being one of the plurality of gray scales; obtaining the first luminance value curve according to each of the reference display brightness levels and the luminance values of the main display area corresponding thereto; obtaining the second luminance value curve according to each of the reference display brightness levels and the luminance values of the transparent display area corresponding thereto.

[0009] In some embodiments, the display brightness level compensation curve is obtained according to the first brightness value curve and the second brightness value curve, including: obtaining, as a plurality of target reference display brightness levels, a plurality of reference display brightness levels at which the brightness values of the main display area and the transparent display area are different, according to the first brightness value curve and the second brightness value curve; obtaining, as a compensation display brightness level of the transparent display area, a reference display brightness level at which the transparent display area reaches the same brightness as the main display area, for each of the target reference display brightness levels; and obtaining the display brightness level compensation curve according to each of the target reference display brightness levels and its corresponding compensation display brightness level.

[0010] In some embodiments, the display panel has a plurality of reference display brightness levels, and the display panel can display a plurality of gray scales at each of the reference display brightness levels. The second gamma correction parameter is obtained according to the first gamma correction parameter, including: obtaining a first adjustment factor and a second adjustment factor, the first adjustment factor representing the difference between the reference display brightness levels corresponding to the main display area and the transparent display area at the same brightness, and the second adjustment factor representing the difference between the gray scales corresponding to the main display area and the transparent display area at the same brightness; and calculating the second gamma correction parameter according to the first gamma correction parameter, and the first adjustment factor and the second adjustment factor.

[0011] In some embodiments, the main display area corresponds to a plurality of groups of the first gamma correction parameter, the transparent display area corresponds to a plurality of groups of the second gamma correction parameter, and each of the reference display brightness levels corresponds to a group of the first gamma correction parameter and a group of the second gamma correction parameter. Some of the plurality of gray scales are reference gray scales, each group of the first gamma correction parameter includes a plurality of gamma correction parameters corresponding to a plurality of the reference gray scales of the main display area, and each group of the second gamma correction parameter includes a plurality of gamma correction parameters corresponding to a plurality of the reference gray scales of the transparent display area.

[0012] The obtained first adjustment factor and second adjustment factor include a plurality of groups of first adjustment factors and second adjustment factors, and each of the reference display brightness levels corresponds to a group of first adjustment factors and second adjustment factors.

[0013] The second gamma correction parameter is fitted and calculated according to the first gamma correction parameter, and the first adjustment factor and the second adjustment factor, including: at each of the reference display brightness levels, the second gamma correction parameter corresponding to each of the reference gray scales is calculated according to the first gamma correction parameter corresponding to each of the reference gray scales, and the first adjustment factor and the second adjustment factor corresponding to the reference display brightness level.

[0014] In some embodiments, the obtaining the first adjustment factor and the second adjustment factor comprises: providing a plurality of test display panels, the test display panels having the same specifications as the display panel to be adjusted in luminance; performing gamma correction on a main display area of each of the test display panels to obtain a first test gamma correction parameter; performing gamma correction on a transparent display area of each of the test display panels to obtain a second test gamma correction parameter; and fitting the first adjustment factor and the second adjustment factor according to a plurality of the first test gamma correction parameters and a plurality of the second test gamma correction parameters corresponding to the plurality of test display panels.

[0015] In some embodiments, the fitting employs linear fitting. The linear fitting employs the following formula: Y = a(X + b). Wherein, X is the first gamma correction parameter, a is the first adjustment factor, b is the second adjustment factor, and Y is the second gamma correction parameter.

[0016] In some embodiments, the display panel comprises a first end close to a driving circuit and a second end away from the driving circuit. Before the performing gamma correction on the main display area to obtain the first gamma correction parameter, the method further comprises: obtaining voltage drop data of a data signal transmitted from the first end to the second end in the display panel; and compensating a gray scale voltage of the display panel according to the voltage drop data. The performing gamma correction on the main display area to obtain the first gamma correction parameter comprises: performing gamma correction on the main display area based on the compensated gray scale voltage to obtain the first gamma correction parameter.

[0017] In some embodiments, the obtaining the second gamma correction parameter according to the first gamma correction parameter comprises: taking the first gamma correction parameter as a second gamma correction parameter for displaying a pixel of the transparent display area.

[0018] In some embodiments, the performing gamma correction on the main display area to obtain the first gamma correction parameter comprises: selecting a target area in the main display area, performing gamma correction on the target area to obtain a gamma correction parameter, and taking the obtained gamma correction parameter as the first gamma correction parameter. Wherein, the target area is located between a center of the display panel and the transparent display area.

[0019] In another aspect, a brightness adjustment method of a display panel is provided. The display panel includes a first end close to a driving circuit and a second end away from the driving circuit. The brightness adjustment method includes: obtaining voltage drop data of a data signal transmitted from the first end to the second end in the display panel; compensating a gray scale voltage of the display panel according to the voltage drop data; and performing gamma correction on the display panel based on the compensated gray scale voltage to obtain a gamma correction parameter.

[0020] In some embodiments, the display panel has a display area including a main display area and a transparent display area, and the transparent display area has a light transmittance greater than that of the main display area. The performing gamma correction on the display panel based on the compensated gray scale voltage to obtain a gamma correction parameter includes: performing gamma correction on the main display area based on the compensated gray scale voltage to obtain a first gamma correction parameter used for driving pixels of the main display area to display; taking the first gamma correction parameter as a second gamma correction parameter used for driving pixels of the transparent display area to display; or performing gamma correction on the transparent display area based on the compensated gray scale voltage to obtain a second gamma correction parameter used for driving pixels of the transparent display area to display. The first gamma correction parameter and the second gamma correction parameter make a luminance difference between the main display area and the transparent display area within a preset range when displaying the same gray scale.

[0021] In another aspect, an electronic device is provided. The electronic device includes a processor and a memory. The memory stores instructions executable by the processor. The processor is configured to execute the instructions to cause the electronic device to implement the brightness adjustment method of any of the above examples.

[0022] In another aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores computer instructions executable by a processor. The computer instructions, when executed by the processor, implement the brightness adjustment method of any of the above examples.

[0023] The electronic device and the computer-readable storage medium provided by some embodiments of the present disclosure have the same beneficial effects as the brightness adjustment method of the display panel provided by some embodiments described above, and will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present disclosure, the following will briefly introduce the drawings needed to be used in some embodiments of the present disclosure. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art according to these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limited to the actual size of the product involved in the embodiments of the present disclosure.

[0025] Figure 1 A schematic diagram of a gamma curve according to the related art;

[0026] Figure 2a A structural diagram of a display device according to some embodiments of the present disclosure;

[0027] Figure 2b A structural diagram of Figure 2a A sectional view of the display device provided in the present disclosure along the MM direction;

[0028] Figure 3 A structural diagram of a display panel according to some embodiments of the present disclosure;

[0029] Figure 4 A structural diagram of a sub-pixel according to some embodiments of the present disclosure;

[0030] Figure 5a A structural diagram of a first sub-pixel located in a main display area according to the "built-in method";

[0031] Figure 5b A structural diagram of a second sub-pixel located in a transparent display area according to the "built-in method";

[0032] Figure 6 A curve diagram of gray scale and driving voltage under different display brightness according to the "built-out method";

[0033] Figure 7a A dot distribution diagram of a display panel according to the "built-out method";

[0034] Figure 7b A curve diagram of Figure 7a A simulation result diagram of driving current of each dot in the present disclosure;

[0035] Figure 7c A curve diagram of driving current and driving voltage of the third dot;

[0036] Figure 7d Another curve diagram of driving current and driving voltage of the third dot;

[0037] Figure 8a A position diagram of two gamma debugging devices according to the second implementation manner;

[0038] Figure 8b A luminance difference diagram of different regions of a display panel according to the second implementation;

[0039] Figure 9 A flowchart of a luminance adjusting method according to some embodiments of the present disclosure;

[0040] Figure 10 A luminance value curve diagram of a main display region and a transparent display region according to some embodiments of the present disclosure;

[0041] Figure 11 A corresponding relationship diagram of different points in the luminance value curve diagram in Figure 10

[0042] Figure 12 A display luminance level compensation curve diagram according to some embodiments of the present disclosure;

[0043] Figure 13 A luminance value difference curve diagram of a main display region and a transparent display region according to some embodiments of the present disclosure;

[0044] Figure 14a A display effect diagram of a display panel according to some embodiments of the present disclosure;

[0045] Figure 14b A display effect diagram of another display panel according to some embodiments of the present disclosure;

[0046] Figure 14c A display effect diagram of yet another display panel according to some embodiments of the present disclosure;

[0047] Figure 14d A display effect diagram of yet another display panel according to some embodiments of the present disclosure;

[0048] Figure 14e A display effect diagram of yet another display panel according to some embodiments of the present disclosure;

[0049] Figure 15 A structural diagram of another display panel according to some embodiments of the present disclosure;

[0050] Figure 16a A luminance value curve diagram of different regions under different gray scales according to a comparative example;

[0051] Figure 16b A relative luminance value difference curve diagram of different regions under different gray scales according to a comparative example;

[0052] Figure 16c A color coordinate value curve diagram of different regions under different gray scales according to a comparative example;​

[0053] Figure 16d is a relative difference curve of color coordinate values of different regions under different gray scales according to one of the comparative examples;

[0054] Figure 16e is a curve of color coordinate values of different regions under different gray scales according to another of the comparative examples;

[0055] Figure 16f is a relative difference curve of color coordinate values of different regions under different gray scales according to another of the comparative examples;

[0056] Figure 17a is a curve of luminance values of different regions under different gray scales according to one of the embodiments of the present disclosure;

[0057] Figure 17b is a relative difference curve of luminance values of different regions under different gray scales according to one of the embodiments of the present disclosure;

[0058] Figure 17c is a curve of color coordinate values of different regions under different gray scales according to one of the embodiments of the present disclosure;

[0059] Figure 17d is a relative difference curve of color coordinate values of different regions under different gray scales according to one of the embodiments of the present disclosure;

[0060] Figure 17e is a curve of color coordinate values of different regions under different gray scales according to another of the embodiments of the present disclosure;

[0061] Figure 17f is a relative difference curve of color coordinate values of different regions under different gray scales according to another of the embodiments of the present disclosure;

[0062] Figure 18 is a structural diagram of an electronic device according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0063] The technical solutions in some embodiments of the present disclosure will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present disclosure.

[0064] Unless the context clearly requires otherwise, throughout the description and the claims, the word "comprise," and variations such as "comprises" or "comprising," will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps. In describing the embodiments of the disclosure, the use of "a" or "an" or "the" to describe embodiments of the disclosure is intended to include one or more than one, unless the context clearly requires otherwise. The term "plurality" is intended to include two or more.

[0065] Hereinafter, the terms "first", "second", etc. are used only for the purpose of description, and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Thus, the features defined with "first", "second" can include one or more than one explicitly or implicitly. In the description of the embodiments of the disclosure, the meaning of "plurality" is two or more, unless otherwise stated.

[0066] "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.

[0067] In addition, the use of "based on" means open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values can be based on additional conditions or values beyond those stated in practice.

[0068] Exemplary embodiments are described herein with reference to cross-sectional and / or plan view illustrations that are idealized illustrations. In the interest of clarity, not all of the scale of the layers and regions can be shown in the drawings. It should be understood that the dimensions of the regions depicted in the figures are shown exaggerated relative to other regions for clarity. Thus, the exemplary embodiments should not be construed as limited to the precise shapes and dimensions as illustrated in the figures, unless otherwise specified. For example, the etched regions shown as rectangular will typically have curved features. Thus, the regions illustrated in the figures are schematic and not intended to be limiting of the scope of the exemplary embodiments in terms of shape or geometry. The exemplary embodiments are not limited to the illustrative shapes of regions shown in the figures.

[0069] Since the sensitivity of human eyes to brightness in a darker environment is much higher than that in a brighter environment, the relationship between the human eye feeling and brightness is not a linear relationship, but shows a certain law. As shown in the following formula (1), the relationship between the human eye feeling and brightness is a power function. Figure 1 As shown in the following formula (1), Figure 1A gamma curve is shown, in which the horizontal coordinate represents the pixel gray scale value (hereinafter referred to as gray scale) of a pixel in a display panel, and the vertical coordinate represents the gray scale luminance value corresponding to the output of the pixel. In order to make the display effect of the OLED display device consistent with the visual perception of the human eye, the relationship between the input gray scale and the corresponding output gray scale luminance value needs to be set as the gray scale luminance value is proportional to the γ power of the gray scale, and this relationship between the gray scale luminance value and the gray scale is called the gamma curve of the display device. For example, the value of γ is set to 2.2±0.2, so that the displayed picture is close to the picture actually seen by the human eye.

[0070] Before the OLED display device is shipped, the OLED display device needs to be adjusted in brightness, and this brightness adjustment process can also be referred to as gamma correction. The purpose of gamma correction is to adjust the ratio of the gray scale luminance value to the γ power of the gray scale to a target value, for example, 2.2±0.2, so as to improve the display effect of the display device.

[0071] Generally, the display panel of the OLED display device has a display brightness level (which can also be referred to as display brightness value, Display Brightness Value, abbreviated as DBV) adjustment range, and the display brightness level of the display device can be changed within this brightness adjustment range. Ideally, the gamma value of the gamma curve corresponding to each display brightness level in this display brightness level adjustment range meets the target value, for example, 2.2±0.2, so that at each display brightness level, the display effect presented by the display device meets the visual perception of the human eye.

[0072] In the actual use of the display device, the user manually adjusts the display brightness level of the display device (for example, by dragging the brightness slider on the display panel of the display device such as a mobile phone to adjust the display brightness level of the display panel of the display device), or the display device automatically adjusts its display brightness level in response to changes in the ambient brightness, which is actually equivalent to switching the gamma curve corresponding to different display brightness levels.

[0073] Among them, the preset DBV (unitless) and the actual luminance value (Luminance Value, abbreviated as Lv, unit: nit) of the display panel generally have a one-to-one correspondence. For example, taking the maximum actual luminance value as 500 nit and the value of DBV as 12 bits (i.e., having 2 12 =4096 DBV values) as an example, where the DBV value of 4096 corresponds to the maximum luminance value of 500 nit.

[0074] Some embodiments of the present disclosure provide a display device 1000. As shown in Figure 2a and Figure 2bAs shown, the display device 1000 includes a display panel 100 having a display area A for displaying an image.

[0075] Optionally, the display area A includes a main display area A1 and a transparent display area A2, and the light transmittance of the portion of the display panel 100 located at the transparent display area A2 is greater than the light transmittance of the portion located at the main display area A1.

[0076] For example, the shape of the transparent display area A2 can be rectangular, circular, or the like.

[0077] For example, the display panel 100 can further include a bezel area B, which can be located at least one side of the display area A. That is, the bezel area B can be located at one side, two sides, or three sides of the display area A. Of course, as Figure 2a As shown, the bezel area B can also surround the display area A.

[0078] In some examples, as Figure 2a and Figure 2b As shown, the display device 1000 can further include an optical device 200 disposed on the non-light-emitting side of the display panel 100 and located at the transparent display area A2.

[0079] The type of the above-mentioned optical device 200 includes a variety of options, which can be selected according to actual needs. For example, the optical device 200 includes a camera, an infrared receiver, or an infrared emitter, etc.

[0080] The display panel 100 has a light-emitting side and a non-light-emitting side. The light-emitting side refers to the side of the display panel 100 for displaying an image. The non-light-emitting side refers to the side of the display panel 100 opposite to the light-emitting side.

[0081] Since the light transmittance of the portion of the display panel 100 located at the transparent display area A2 is greater than the light transmittance of the portion located at the main display area A1, the light located at the light-emitting side of the display panel 100 can pass through the transparent display area A2 into the optical device 200, or the light emitted by the optical device 200 can pass through the transparent display area A2 and be incident on the light-emitting side of the display panel 100, achieving normal use of the optical device 200.

[0082] By disposing the above-mentioned optical device 200 on the non-light-emitting side of the display panel 100 and setting the optical device 200 at the transparent display area A2, the screen-to-body ratio of the display device 1000 can be improved.

[0083] Here, the type of the display device 1000 described above includes a plurality of types, and can be selected and arranged according to actual needs. For example, the display device 1000 described above can be an OLED (Organic Light Emitting Diode) display device, a QLED (Quantum Dot Light Emitting Diodes) display device, a Mini LED (Mini Light Emitting Diode) display device, or a Micro LED (Micro Light Emitting Diode) display device, etc.

[0084] In the following, the display device 1000 described above is taken as an OLED display device, and the optical device 200 is taken as a camera as an example for illustrative purposes.

[0085] In some embodiments, as shown in FIG. 1, the display panel 100 can include a plurality of sub-pixels P. Each sub-pixel P includes a pixel driving circuit D and a light emitting device L electrically connected to the pixel driving circuit D. Figure 3

[0086] Based on the display device 1000 described above being an OLED display device, the light emitting device L can be an OLED.

[0087] The structure of the pixel driving circuit D described above includes a plurality of structures, and can be selected and arranged according to actual needs. For example, the structure of the pixel driving circuit D can include a “6T1C”, “7T1C”, “6T2C”, or “7T2C” structure, etc. Here, “T” represents a transistor, the number before “T” represents the number of transistors, and “C” represents a storage capacitor, the number before “C” represents the number of storage capacitors.

[0088] It should be noted that the pixel driving circuit D includes a driving transistor and at least one light emitting control transistor.

[0089] For example, as shown in FIG. 1, the pixel driving circuit D can include a driving transistor T1, a first light emitting control transistor T2, a second light emitting control transistor T3, and a storage capacitor C1. Figure 4 ​As shown, the pixel driving circuit D in the above structure is taken as an example of a 7T1C structure. The pixel driving circuit D includes a driving transistor T3, and light-emitting control transistors T5 and T6. The driving transistor T3 can provide a driving signal (i.e., a driving current) to the corresponding light-emitting device L according to a data signal input to the pixel driving circuit D from a data signal terminal Data. The light-emitting control transistors T5 and T6 can control the on and off between the driving transistor and the light-emitting device L under the control of an enable signal transmitted from an enable signal terminal EM. That is, the magnitude of the voltage value of the data signal can control the magnitude of the driving current provided to the light-emitting device L; the enable signal can control whether the driving current is transmitted to the light-emitting device L and the length of time for which the driving current is transmitted to the light-emitting device L, i.e., the enable signal can control whether the light-emitting device L emits light and the length of time for which the light-emitting device L emits light.

[0090] As an example, the enable signal is a pulse width modulation signal. In one light-emitting stage, by adjusting the duty cycle of the pulse width modulation signal, the length of time for which the driving current is transmitted to the light-emitting device L can be controlled, and thus the display brightness of the display panel 100 can be adjusted. For example, the higher the duty cycle of the pulse width modulation signal, the longer the length of time for which the corresponding light-emitting device L emits light in one light-emitting stage, and the higher the display brightness of the display panel 100. Conversely, the lower the display brightness of the display panel 100.

[0091] As an example, in one light-emitting stage, by adjusting the voltage value of the data signal, the magnitude of the driving current can be controlled, and thus the display brightness of the display panel 100 can be adjusted. For example, the higher the voltage value of the data signal, the smaller the driving current, and the lower the light-emitting brightness of the corresponding light-emitting device L in one light-emitting stage, and the lower the display brightness of the display panel 100. Conversely, the higher the display brightness of the display panel 100.

[0092] Here, the case where the plurality of transistors included in the pixel driving circuit D are taken as an example of P-type transistors. Figure 4 As an example, in one light-emitting stage, by adjusting the voltage value of the data signal, the magnitude of the driving current can be controlled, and thus the display brightness of the display panel 100 can be adjusted. For example, the higher the voltage value of the data signal, the smaller the driving current, and the lower the light-emitting brightness of the corresponding light-emitting device L in one light-emitting stage, and the lower the display brightness of the display panel 100. Conversely, the higher the display brightness of the display panel 100.

[0093] As can be seen from the above, the display brightness of the sub-pixel P and the display brightness of the display panel 100 are at least controlled by the data signal and the enable signal.

[0094] It should be noted that the wiring in the pixel driving circuit D can block light passing through the pixel driving circuit D, reducing the light transmittance of the display area A of the display panel 100.

[0095] In some examples, asFigure 3 As shown, the plurality of sub-pixels P can include a plurality of first sub-pixels P1 and a plurality of second sub-pixels P2.

[0096] For example, as shown in FIG. 2A, the plurality of first sub-pixels P1 can be arranged in a main display area A1 of the display panel 100. Figure 3 As shown, the plurality of first sub-pixels P1 are located in the main display area A1. That is, the pixel driving circuit D and the light emitting device L of the plurality of first sub-pixels P1 are both located in the main display area A1.

[0097] There are various design methods for the structure of the second sub-pixels P2 in the transparent display area A2. By specially designing the structure of the second sub-pixels P2, the transmittance of the transparent display area A2 to external light can be improved.

[0098] The first method is to reduce the size or density of the second sub-pixels P2 in the transparent display area A2, and the pixel driving circuit D of the second sub-pixels P2 is still located below the corresponding light emitting device L. This method is referred to as the “built-in method”.

[0099] An example of the structure of the “built-in method” is described below.

[0100] For example, as shown in FIG. 2B, the plurality of first sub-pixels P1 can be arranged in the main display area A1 of the display panel 100. Figure 5a and Figure 5b As shown, Figure 5a FIG. 2C shows an arrangement design of the plurality of first sub-pixels P1 in the main display area A1, wherein the plurality of first sub-pixels P1 include a plurality of red sub-pixels (labeled “R” in the figure), a plurality of green sub-pixels (labeled “G” in the figure), and a plurality of blue sub-pixels (labeled “B” in the figure). Figure 5b FIG. 2D shows an arrangement design of the plurality of second sub-pixels P2 in the transparent display area A2, wherein the plurality of second sub-pixels P2 include a plurality of red sub-pixels (labeled “R” in the figure), a plurality of green sub-pixels (labeled “G” in the figure), and a plurality of blue sub-pixels (labeled “B” in the figure). The pixel density in the transparent display area A2 (for example, which can be 199 pixels / inch) is less than the pixel density in the main display area A1 (for example, which can be 398 pixels / inch), so more areas in the transparent display area A2 can allow light to pass through, thereby improving the transmittance of the transparent display area A2 to external light and increasing the amount of external light received by the optical device 200.

[0101] However, because there are two different arrangement designs of sub-pixels in the same display panel, after one gamma correction is performed on the display panel 100, the display brightness and chroma of the transparent display area A2 cannot reach the effect of the main display area A1, thereby causing a display difference between the main display area A1 and the transparent display area A2, which affects the overall display effect of the display panel 100.

[0102] The second method involves designing the size or density of the second sub-pixel P2 in the transparent display area A2 to be consistent with the size or density of the first sub-pixel P1, but placing the pixel driving circuit D of the second sub-pixel P2 outside the transparent display area A2. This method is simply referred to as the "external method".

[0103] The following example illustrates one type of "external method".

[0104] For example, such as Figure 3 As shown, among the above-mentioned multiple second sub-pixels P2, the light-emitting device L of each second sub-pixel P2 is located in the transparent display area A2, and the pixel driving circuit D of each second sub-pixel P2 is located in the area outside the transparent display area A2.

[0105] By setting the first sub-pixel P1 in the main display area A1 and setting the light-emitting devices L of each second sub-pixel P2 in the transparent display area A2, the display panel 100 and display device 1000 can achieve full-screen display using the light-emitting devices L of each first sub-pixel P1 and second sub-pixel P2. By setting the pixel driving circuit D of each second sub-pixel P2 in the main display area A1 or the bezel area B, when external light passes through the portion of the display panel 100 located in the transparent display area A2 and enters the optical device 200, the pixel driving circuit D of the second sub-pixel P2 can be prevented from blocking the external light, thereby increasing the transmittance of external light and increasing the amount of external light received by the optical device 200.

[0106] It should be noted that, as Figure 3 As shown, after setting the pixel driving circuit D of each second sub-pixel P2 in the main display area A1 or the border area B, it is necessary to set an additional connecting trace C (the material of which is, for example, indium tin oxide, to avoid affecting the transmittance of external light) so as to connect the pixel driving circuit D and the corresponding light-emitting device L, and then the driving current can be transmitted to the light-emitting device L through the connecting trace C.

[0107] For example, such as Figure 6 As shown, Figure 6 This is a graph showing the relationship between different display grayscale levels and driving voltage (i.e., the voltage value of the data signal). Specifically, for the same change in driving voltage ΔV, the number of grayscale levels changed when the display brightness is 2 nits (low brightness) is greater than the number of grayscale levels changed when the display brightness is 400 nits (high brightness). For the same change in grayscale level ΔG, the change in driving voltage when the display brightness is 2 nits (low brightness) is less than the change in driving voltage when the display brightness is 400 nits (high brightness). In other words, when the display brightness is within the low brightness range, the display brightness is not very sensitive to changes in grayscale levels.

[0108] However, in each second sub-pixel P2, the presence of the connecting trace C, which has resistance, increases the resistance between the pixel driving circuit D and the corresponding light-emitting device L. Consequently, when the pixel driving circuit D of the second sub-pixel P2 provides driving current to the corresponding light-emitting device L, the change in driving current per unit change in driving voltage is relatively small. This results in the transparent display area A2 becoming less sensitive to grayscale changes when the display brightness is in the low brightness range, leading to a more pronounced darkening of the transparent display area A2 at low brightness levels.

[0109] Alternatively, in another display panel structure using the "external method," the inventors of this disclosure selected five points in different areas of the display panel and simulated the driving current of the pixel driving circuits corresponding to these points. For example... Figure 7a As shown, the transparent display area A2 is circular in shape. Points D1, D2, and D4 are located at the edge of the transparent display area A2, point D3 is located at the geometric center of the transparent display area A2, and point D5 is located at the midpoint of the side closest to the main display area A1. Figure 7b As shown, Figure 7b The simulation results for the driving current Ids of the pixel driving circuits corresponding to the above-mentioned points show that the driving current Ids of the third point D3, located at the geometric center of the transparent display area A2, differs significantly from the driving current Ids of the other points. This will lead to a difference in display brightness between the transparent display area A2 and the main display area A1. The reason for the larger driving current Ids of the third point D3 is that the traces of the pixel driving circuit D at the third point D3 use indium tin oxide, which has a higher resistance. Figure 4 In the pixel driving circuit structure shown, the voltage drop of the data signal Data after it is transmitted to the third point D3 is relatively large. The display panel driving transistor T3 is a P-type transistor. Since the voltage drop at point C is greater, the source-drain voltage difference is greater during the light-emitting stage. Therefore, the driving current Ids of the driving transistor T3 is greater at the third point D3.

[0110] Furthermore, the inventor also discovered that, such as Figure 7c and Figure 7d As shown, Figure 7c The graph shows the driving current Ids versus driving voltage U at point D3 with zero grayscale. Figure 7d The graphs above show the driving current Ids versus driving voltage U for point D3 at grayscale level 255. As can be seen from the two graphs above, the driving current Ids of point D3 changes with the driving voltage U at both grayscale levels.

[0111] In order to reduce the difference in display brightness between the transparent display area A2 and the main display area A1, in the first implementation, two Vinit1 wires are arranged in the pixel driving circuit D of the display panel, the voltage of the Vinit1 signal in the pixel driving circuit D of the second sub-pixel P2 of the transparent display area A2 is different from the voltage of the Vinit1 signal in the pixel driving circuit D of the first sub-pixel P1 of the main display area A1, as shown in FIG. 7, so that the N1 node has different voltages after different Vinit1 signals are transmitted to the N1 node, and correspondingly, the voltage drop after the data signal Data is transmitted to the transparent display area A2 can be partially offset, so as to reduce the difference in brightness between the main display area A1 and the transparent display area A2. Figure 4

[0112] Further, by reasonably setting the Vinit1 signal voltage in the pixel driving circuit D of the first sub-pixel P1 and the Vinit1 signal voltage in the pixel driving circuit D of the second sub-pixel P2, the brightness difference between the main display area A1 and the transparent display area A2 can be minimized. For example, the Vinit1 signal voltage of the main display area A1 is -2.4V, and the Vinit1 signal voltage of the transparent display area A2 is -1.6V or higher.

[0113] However, in the case of setting two different Vinit1 signal voltages, an additional second Vinit1 wire needs to be added in the display panel, thereby increasing the difficulty and cost of mask manufacturing in the backplane manufacturing process of the display panel, and the newly added wire will also affect the wire space of the pixel driving circuit in the original display panel backplane, which will limit the improvement of the pixel density of the display panel provided with the optical device 200. For example, through simulation verification, in the case of two Vinit1 wires, the pixel density of the display panel is difficult to exceed 450 pixels / inch.

[0114] In the second implementation, as shown in FIG. 8, two gamma debugging devices (i.e., the gamma debugging device 1 and the gamma debugging device 2 shown in FIG. 6) are used to respectively perform gamma correction on the main display area and the transparent display area of the display panel, and this gamma correction method can be referred to as "double gamma debugging". However, this method needs to additionally increase one gamma debugging device, which will increase the cost of the display panel manufacturer. Moreover, in this method, the position of the gamma correction of one of the gamma debugging devices is located at the center of the display panel, and due to the influence of the display defect compensation characteristics of the display panel in the later stage, as shown in FIG. 9, the brightness difference between the main display area A1 and the transparent display area A2 is still large. Figure 8a Figure 8a Figure 8b ​​​As shown, the luminance of the area below the transparent display area A2 has a 10% difference with the luminance of the central area of the main display area A1, which will result in a large error of the gamma correction data obtained by the gamma debugging device for the gamma correction of the transparent display area A2, and even if the display defect compensation and voltage drop compensation are performed later, the luminance difference after the compensation is still obvious.

[0115] Based on this, some embodiments of the present disclosure provide a luminance adjustment method of a display panel, as shown in the following figure. Figure 9 As shown, the luminance adjustment method is applied to the display panel 100 described above. The luminance adjustment method includes S100A-S200A.

[0116] S100A, gamma correction is performed on the main display area A1 to obtain first gamma correction parameters, and the first gamma correction parameters are used to drive the pixels of the main display area A1 to display.

[0117] For example, a pixel can include a red sub-pixel, a green sub-pixel, and a blue sub-pixel.

[0118] The above-mentioned gamma correction parameters represent the gray scale voltage corresponding to one gray scale at one display luminance level, and the gray scale voltage represents the driving voltage (or data signal voltage) corresponding to the pixel driving circuit of one sub-pixel.

[0119] For example, the above-mentioned gamma correction parameters include display luminance level information and gray scale information.

[0120] For example, in the case that one pixel of the main display area A1 needs to display 255 gray scales at one display luminance level, the driving voltage of the pixel driving circuit of the pixel is obtained according to the first gamma correction parameters.

[0121] S200A, second gamma correction parameters are obtained according to the first gamma correction parameters, and the second gamma correction parameters are used to drive the pixels of the transparent display area A2 to display. Wherein, the first gamma correction parameters and the second gamma correction parameters make the luminance difference of the above-mentioned main display area A1 and the above-mentioned transparent display area A2 when displaying the same gray scale within a preset range.

[0122] For example, in the case that one pixel of the transparent display area A2 needs to display 255 gray scales at one display luminance level, the driving voltage of the pixel driving circuit of the pixel is obtained according to the second gamma correction parameters.

[0123] The above-mentioned preset range is a range within the maximum allowed luminance difference.

[0124] For example, the above-mentioned preset range can be set according to the actual demand. For example, the above-mentioned preset range can be set according to the customer demand.

[0125] By the above method, after one gamma correction is performed on the main display area A1, the second gamma correction parameter of the transparent display area A2 can be obtained according to the first gamma correction parameter of the main display area A1, so as to be used for driving the main display area A1 and the transparent display area A2 respectively, and the luminance difference between the main display area A1 and the transparent display area A2 when displaying the same gray scale is reduced. Compared with the first implementation manner, the second Vinit1 trace line does not need to be additionally arranged, so as to avoid increasing the difficulty and cost of mask manufacturing in the back plate manufacturing process of the display panel 100, save the trace line space of the pixel driving circuit in the back plate of the display panel 100, and be beneficial to the improvement of the pixel density of the display panel 100. Compared with the second implementation manner, the second gamma debugging device does not need to be additionally arranged, so as to simplify the gamma correction process, shorten the gamma correction time, improve the production efficiency, and avoid increasing the cost of the display panel manufacturer.

[0126] Therefore, the luminance adjustment method of the display panel provided by some embodiments of the present disclosure can make the main display area A1 and the transparent display area A2 display according to different gamma correction parameters, reduce the luminance difference between the main display area A1 and the transparent display area A2 when displaying the same gray scale, and avoid increasing the difficulty and cost of mask manufacturing in the back plate manufacturing process of the display panel 100, save the trace line space of the pixel driving circuit in the back plate of the display panel 100, and be beneficial to the improvement of the pixel density of the display panel 100. In addition, the luminance adjustment method does not need to increase the second gamma debugging device, so as to simplify the gamma correction process, shorten the gamma correction time, improve the production efficiency, and avoid increasing the cost of the display panel manufacturer.

[0127] In some embodiments, the main display area A1 corresponds to a plurality of groups of first gamma correction parameters, the transparent display area A2 corresponds to a plurality of groups of second gamma correction parameters, and the display panel 100 has a plurality of reference display luminance levels, each reference display luminance level corresponding to a group of first gamma correction parameters and a group of second gamma correction parameters.

[0128] In some examples, the plurality of reference display luminance levels are part of all display luminance levels of the display panel 100, and the plurality of reference display luminance levels at least include the maximum display luminance level and the minimum display luminance level of all display luminance levels of the display panel 100. The reference display luminance levels can also include a plurality of display luminance levels selected according to customer requirements from all display luminance levels.

[0129] For example, the display panel 100 has 4096 display brightness levels, and the reference display brightness levels are 10.

[0130] By setting the reference display brightness levels, in the process of performing gamma correction on the main display area A1, the remaining display brightness levels can be obtained by interpolation after the reference display brightness levels are corrected, which can simplify the entire gamma correction process, save gamma correction time, and improve production efficiency.

[0131] In addition, the display panel 100 has multiple reference display brightness levels, so that the display panel 100 can display under multiple reference display brightness levels, and the luminance difference between the main display area A1 and the transparent display area A2 is small under multiple reference display brightness levels.

[0132] It should be noted that the "obtaining the second gamma correction parameter according to the first gamma correction parameter" in S200A can have multiple methods.

[0133] In some possible embodiments, the "obtaining the second gamma correction parameter according to the first gamma correction parameter" in S200A includes S210A-S230A.

[0134] S210A, as shown in Figure 10 The first luminance value curve L1 represents the correspondence between the reference display brightness level (DBV) and the luminance value (Lv) of the main display area A1, and the second luminance value curve L2 represents the correspondence between the reference display brightness level and the luminance value of the transparent display area A2.

[0135] It can be understood that in the process of obtaining the first luminance value curve L1 and the second luminance value curve L2, the main display area A1 and the transparent display area A2 are driven by the first gamma correction parameter.

[0136] As can be seen from Figure 10 At the same display brightness level (DBV), the main display area A1 and the transparent display area A2 have different luminance values (Lv), that is, the display brightness of the main display area A1 and the transparent display area A2 has a difference.

[0137] In some examples, the display panel 100 can display multiple gray scales under each reference display brightness level.

[0138] For example, the above-mentioned multiple gray scales are 256 gray scales, which can make the display panel 100 display multiple gray scale images under each reference display brightness level.

[0139] In some examples, the "obtaining the first luminance value curve L1 and the second luminance value curve L2 respectively" in S210A includes S211A-S213A.

[0140] S211A, respectively testing the luminance value of the main display area A1 at the target gray scale and the luminance value of the transparent display area A2 at the target gray scale under each reference display luminance level. The target gray scale is one of the plurality of gray scales.

[0141] For example, when the plurality of gray scales is 256 gray scales, the target gray scale can be 10 gray scales, 100 gray scales, or 240 gray scales, etc.

[0142] By the above method, the process of obtaining the luminance value L2 of the main display area A1 at the target gray scale can be simplified.

[0143] In some examples, the target gray scale is the maximum gray scale in the plurality of gray scales.

[0144] For example, when the plurality of gray scales is 256 gray scales, the target gray scale is 255 gray scales.

[0145] It can be understood that the luminance of 255 gray scales is high, so that the luminance value at the target gray scale can be conveniently detected.

[0146] S212A, obtaining the first luminance value curve L1 according to each reference display luminance level and the luminance value of the corresponding main display area A1.

[0147] For example, the display luminance level between the adjacent two reference display luminance levels and the luminance value of the corresponding main display area A1 can be obtained by interpolation method.

[0148] S213A, obtaining the second luminance value curve L2 according to each reference display luminance level and the luminance value of the corresponding transparent display area A2.

[0149] For example, the display luminance level between the adjacent two reference display luminance levels and the luminance value of the corresponding transparent display area A2 can be obtained by interpolation method.

[0150] S220A, obtaining a display luminance level compensation curve L3 according to the first luminance value curve L1 and the second luminance value curve L2, as shown in Figure 12 The display luminance level compensation curve L3 represents the corresponding relationship between the reference display luminance level and the compensation display luminance level of the transparent display area A2, and the luminance values (Lv) corresponding to the corresponding reference display luminance level and compensation display luminance level are the same.

[0151] For example, as shown in Figure 11As shown, the obtaining process of the corresponding relationship between each reference display brightness level in the display brightness level compensation curve and the compensated display brightness level of the transparent display area can be: obtaining the luminance value (for example, Lv=190 nit) of point A according to the display brightness level (for example, DBV=1400) of point A on the first luminance value curve L1, compensating the display brightness level (for example, DBV=1400) of point B on the second luminance value curve L2 to the display brightness level (for example, DBV=1500) of point C, and making the luminance value of point C equal to the luminance value (for example, Lv=190 nit) of point A. The display brightness level (DBV) corresponding to point C is a compensated display brightness level of the transparent display area A2. The above operation is repeated to obtain all the compensated display brightness levels of the transparent display area A2, thereby obtaining the display brightness level compensation curve L3 as shown. Figure 12 As shown, the display brightness level compensation curve L3 is obtained. Figure 12 It can be seen that, compared with the second luminance value curve L2, the luminance value corresponding to the display brightness level compensation curve L3 is greater than the luminance value corresponding to the second luminance value curve L2 at the same display brightness level (DBV).

[0152] For example, in the process of obtaining the display brightness level compensation curve L3 as shown, Figure 12 the display brightness level of the points corresponding to the transparent display area A2 and the main display area A1 at the same display brightness level can be compensated, so that the obtaining process of the display brightness level compensation curve L3 is simplified and time is saved.

[0153] In S230A, for each reference display brightness level, the compensated display brightness level corresponding to the reference display brightness level is obtained according to the display brightness level compensation curve L3, and a group of gamma correction parameters corresponding to the reference display brightness level with the same value as the compensated display brightness level is found from the multiple groups of first gamma correction parameters as a group of second gamma correction parameters corresponding to the reference display brightness level of the transparent display area A2.

[0154] For example, because the luminance value corresponding to each reference display brightness level in the display brightness level compensation curve L3 is the same as the luminance value corresponding to the main display area A1 at the reference display brightness, the luminance value of the transparent display area A2 at the reference display brightness is the same as the luminance value corresponding to the main display area A1, and the luminance difference between the transparent display area A2 and the main display area A1 can be reduced.

[0155] The inventors of the present disclosure have tested the luminance difference before and after compensation, and the test results are as shown in Figure 13As shown in the figure, the solid line L4 is the difference in luminance values of the main display area A1 and the transparent display area A2 at different display luminance levels in the case of no compensation, the dotted line L5 is the compensation value of the luminance value of the transparent display area A2 at different display luminance levels relative to the original luminance value, and the dashed line L6 is the difference in luminance values of the main display area A1 and the transparent display area A2 at different display luminance levels after the luminance value of the transparent display area A2 is compensated. As can be seen from the figure, after the luminance value of the transparent display area A2 is compensated, the difference in luminance values of the main display area A1 and the transparent display area A2 at different display luminance levels is close to 0, that is, the luminance values of the main display area A1 and the transparent display area A2 at different display luminance levels are almost the same.

[0156] In some other possible embodiments, the "obtaining the second gamma correction parameter according to the first gamma correction parameter" in S200A includes S210B-S220B.

[0157] S210B, obtaining a first adjustment factor and a second adjustment factor, the first adjustment factor of the display panel 100 representing the difference between the main display area A1 of the display panel and the reference display luminance level corresponding to the transparent display area A2 of the display panel at the same luminance, and the second adjustment factor of the display panel representing the difference between the main display area A1 of the display panel and the gray scale corresponding to the transparent display area A2 of the display panel at the same luminance.

[0158] In some examples, in S210B, "obtaining the first adjustment factor and the second adjustment factor" includes S211B-S213B.

[0159] S211B, providing a plurality of test display panels, the test display panels being the same in specification as the display panel to be subjected to luminance adjustment.

[0160] For example, the display panels that are the same in specification can have a smaller display luminance difference in the process of displaying using the same gamma correction parameter.

[0161] Through the above setting, the influence of the specification difference of the display panel on the first adjustment factor and the second adjustment factor can be reduced, so that the finally obtained first adjustment factor and second adjustment factor are more accurate.

[0162] S212B, performing gamma correction on the main display area A1 of each test display panel to obtain a first test gamma correction parameter, and performing gamma correction on the transparent display area A2 of each test display panel to obtain a second test gamma correction parameter.

[0163] That is, the first test gamma correction parameter and the second test gamma correction parameter are obtained by the above-mentioned "double gamma debugging". Correspondingly, in the case that the main display area A1 is displayed using the first test gamma correction parameter and the transparent display area A2 is displayed using the first test gamma correction parameter, the main display area A1 and the transparent display area A2 have a small display brightness difference.

[0164] S213B, according to the plurality of first test gamma correction parameters and the plurality of second test gamma correction parameters corresponding to the plurality of test display panels, fitting to obtain the first adjustment factor and the second adjustment factor.

[0165] In many fields of science and technology, the following problems are often encountered: in various physical problems and statistical problems, a plurality of data sets are obtained by observing or experimenting on related quantities a plurality of times. The data sets are scattered, inconvenient to process, and often cannot exactly and fully reflect the inherent laws. In order to obtain the inherent laws between the data or to predict the expected data with the current data, a continuous curve is used to approximately depict or imitate the functional relationship between the coordinates represented by the scattered point groups on the plane. In numerical analysis, curve fitting is to approximate discrete data with an analytical expression, that is, to formalize the discrete data.

[0166] For example, the method of fitting to obtain the first adjustment factor and the second adjustment factor can include a least squares method or other statistical calculation method.

[0167] The least squares method is a mathematical tool widely used in many disciplines such as error estimation, uncertainty, system identification, prediction, and data processing.

[0168] Through the above method, the corresponding first adjustment factor and second adjustment factor can be obtained in the case that the main display area A1 and the transparent display area A2 have a small display brightness difference.

[0169] In some embodiments, the above fitting uses linear fitting. The linear fitting uses the following formula:

[0170] Y = a(X + b);

[0171] Wherein, X is the first gamma correction parameter, a is the first adjustment factor, b is the second adjustment factor, and Y is the second gamma correction parameter.

[0172] By using linear fitting, compared with multiple linear or nonlinear fitting, the calculation amount in the fitting process can be simplified, and the time of fitting to obtain the first adjustment factor and the second adjustment factor can be reduced. Through the above formula, the second gamma correction parameter can be calculated from the first gamma correction parameter.

[0173] For example, the process of obtaining the first adjustment factor and the second adjustment factor by fitting can be: selecting a vector value of a plurality of (for example, 24) gray scales in the first test gamma correction parameter at a certain brightness level as the X value of the above formula, and selecting a corresponding vector value of a plurality of (for example, 24) gray scales in the second test gamma correction parameter at the same brightness level as the Y value of the above formula, and obtaining the first adjustment factor a and the second adjustment factor b by linear fitting according to the plurality of X values and Y values. By repeating the above operation, a plurality of sets of first adjustment factors a and second adjustment factors b at each reference brightness level can be obtained.

[0174] S220B, according to the first gamma correction parameter of the display panel, and the first adjustment factor and the second adjustment factor of the display panel, calculating the second gamma correction parameter of the display panel.

[0175] For example, by the first adjustment factor a, the reference display brightness level corresponding to the transparent display area A2 of the display panel can be calculated from the reference display brightness level of the main display area A1 of the display panel, so that the transparent display area A2 and the main display area A1 can display the same brightness. By the second adjustment factor b, the gray scale corresponding to the transparent display area A2 of the display panel can be calculated from the gray scale of the main display area A1 of the display panel, so that the transparent display area A2 and the main display area A1 can display the same brightness.

[0176] For example, at a certain brightness, the reference display brightness level corresponding to the main display area A1 is 20, and the gray scale is 50. By the first adjustment factor and the second adjustment factor and the above formula, the reference display brightness level corresponding to the transparent display area A2 at the brightness is calculated to be 22, and the gray scale is 55.

[0177] In some embodiments, some of the plurality of gray scales are reference gray scales, each set of first gamma correction parameters includes a plurality of gamma correction parameters corresponding to a plurality of reference gray scales of the main display area A1, and each set of second gamma correction parameters includes a plurality of gamma correction parameters corresponding to a plurality of reference gray scales of the transparent display area A2.

[0178] It should be noted that when performing gamma correction, not all gray scales are subjected to gamma correction, but some gray scales are selected for gamma correction. These selected gray scales are reference gray scales, and the gray scale voltage of other gray scales is calculated by interpolation according to the gray scale voltage of the reference gray scale. In this way, the process of gamma correction can be simplified, and the production efficiency can be improved.

[0179] In some examples, the obtained first adjustment factor and the second adjustment factor include a plurality of sets of first adjustment factors and second adjustment factors, and each reference display brightness level corresponds to a set of first adjustment factors and second adjustment factors.

[0180] Exemplarily, each group of the first adjustment factor and the second adjustment factor corresponds to each other.

[0181] By making each reference display brightness level correspond to a group of the first adjustment factor and the second adjustment factor, the second gamma correction parameter obtained at each reference display brightness level can be more accurate, so that the luminance adjustment of the transparent display area A2 is more accurate.

[0182] In some examples, in S220B, “fitted to obtain the second gamma correction parameter according to the first gamma correction parameter, and the first adjustment factor and the second adjustment factor” includes: at each reference display brightness level, according to the first gamma correction parameter corresponding to each reference gray scale, and the first adjustment factor and the second adjustment factor corresponding to the reference display brightness level, the second gamma correction parameter corresponding to the reference gray scale is calculated.

[0183] By the above method, the second gamma correction parameter corresponding to all reference gray scales at each reference display brightness level in the first gamma correction parameter can be obtained.

[0184] The inventors of the present disclosure tested the display effect of the display panel after the luminance adjustment of the display panel by using the above-mentioned S210B-S220B method, as shown in Figure 14a to Figure 14e , as shown in Figure 14a , as shown in Figure 14b , as shown in Figure 14c , as shown in Figure 14d , as shown in Figure 14e , as shown in From the above figures, it can be seen that after the luminance adjustment of the display panel by using the above-mentioned S210B-S220B method, the luminance between the main display area and the transparent display area of the display panel is almost the same.

[0185] And, taking the case that one gamma correction includes 10 reference display brightness levels and each reference display brightness level includes 24 reference gray scales, it takes about 30 minutes to debug the display panel by using the “double gamma debugging method”. In the process of adjusting the luminance of the display panel by using the above-mentioned S210B-S220B method, only one gamma correction is performed on the main display area, compared with using the “double gamma debugging method”, the process of adjusting the luminance of the display panel by using the above-mentioned S210B-S220B method can save half of the debugging time, which can greatly improve the production capacity of the display panel.

[0186] In some embodiments, as Figure 3As shown, the display panel 100 includes a first end 100A close to the driving circuit E, and a second end 100B away from the driving circuit E.

[0187] For example, the driving circuit E is configured to provide various control signals for the pixel driving circuit D. The driving circuit E can include a gate driving circuit, a source driving circuit, etc. Correspondingly, the farther the pixel driving circuit D is from the driving circuit E, the farther the control signals provided by the driving circuit E need to be transmitted, and the greater the attenuation of the control signals.

[0188] In some embodiments, before the step of "performing gamma correction on the main display area A1 to obtain first gamma correction parameters" in S100A, the brightness adjustment method of the present disclosure further includes S10-S20:

[0189] S10, obtaining voltage drop data of the data signal transmitted from the first end 100A to the second end 100B in the display panel 100.

[0190] S20, compensating the gray scale voltage of the display panel 100 according to the voltage drop data.

[0191] For example, the voltage drop of the data signal transmitted from the first end 100A to the second end 100B is 0.5V, and the voltage compensating the gray scale voltage of the display panel 100 is also 0.5V.

[0192] Through the above steps, the attenuation of the control signals transmitted by the driving circuit E due to the large distance between the pixel driving circuit D and the driving circuit E can be reduced, thereby reducing the brightness difference of the pixels at different distances from the driving circuit E in the display panel 100, and making the brightness of the pixels at different positions in the display panel 100 consistent. Therefore, during the gamma correction of the main display area A1, the influence of the position of the gamma correction on the result of the gamma correction can be avoided.

[0193] The inventors of the present disclosure tested the brightness uniformity of the main display area A1 of the display panel 100 before and after the compensation of the gray scale voltage, and the test results are shown in Table 1 below.

[0194] Table 1

[0195]

[0196] The calculation method of the above brightness uniformity value is: minimum brightness / maximum brightness * 100%. The smaller the brightness uniformity value, the greater the brightness difference between the regions of the display panel; the greater the brightness uniformity value, the smaller the brightness difference between the regions of the display panel.

[0197] As shown in Table 1, the brightness uniformity of the display panel a before the gray scale voltage compensation is 81%, and the brightness uniformity of the display panel a after the gray scale voltage compensation is 95%; the brightness uniformity of the display panel β before the gray scale voltage compensation is 80%, and the brightness uniformity of the display panel β after the gray scale voltage compensation is 92%. Therefore, after the gray scale voltage compensation, the brightness uniformity of the display panel can be improved.

[0198] In some examples, in S100A, the "performing gamma correction on the main display area A1 to obtain the first gamma correction parameter" includes: performing gamma correction on the main display area A1 based on the compensated gray scale voltage to obtain the first gamma correction parameter.

[0199] After the gray scale voltage compensation of the display panel, performing gamma correction on the main display area A1 can avoid the brightness difference of pixels at different positions in the process of driving the main display area A1 to display by the first gamma correction parameter.

[0200] In some possible embodiments, the "obtaining the second gamma correction parameter according to the first gamma correction parameter" in S200A includes S210C.

[0201] S210C, taking the first gamma correction parameter as the second gamma correction parameter for driving the pixels of the transparent display area A2 to display.

[0202] It can be understood that, because the gray scale voltage of the display panel 100 is compensated before the first gamma correction parameter is obtained, the display panel 100 has a higher brightness uniformity, and in the case of taking the first gamma correction parameter as the second gamma correction parameter for driving the pixels of the transparent display area A2 to display, the brightness value difference between the main display area A1 and the transparent display area A2 at different display brightness levels can be reduced.

[0203] In some examples, in S100A, the "performing gamma correction on the main display area A1 to obtain the first gamma correction parameter" further includes: as Figure 15 shown, selecting a target region Q in the main display area A1, performing gamma correction on the target region Q to obtain a gamma correction parameter, and taking the obtained gamma correction parameter as the first gamma correction parameter. The target region Q is located between the center O of the display panel 100 and the transparent display area A2.

[0204] By the above setting, the measured luminance of the gamma debugging device in the gamma correction process can be closer to the display luminance of the transparent display area A2, and according to the algorithm principle of the display defect debugging (which is commonly known as Demura in the art) mentioned below, the display panel 100 can reduce the luminance difference between the main display area A1 and the transparent display area A2 in the process of displaying according to the first gamma correction parameter. Moreover, the position of the target area Q can also make the obtained gamma correction parameter be basically not affected by the size of the transparent display area A2.

[0205] Further, the display panel 100 is in a rectangular shape, the transparent display area A2 is located at one end of the display panel close to the short side of the above-mentioned rectangle, the length of the long side of the above-mentioned rectangle is h, in this case, as shown in Figure 15 The center position O of the target area Q can be moved by a distance of h / 4 from the center of the display panel 100 to the direction close to the transparent display area A2, which can further make the measured luminance of the gamma debugging device closer to the display luminance of the transparent display area A2, so as to further reduce the luminance difference between the main display area A1 and the transparent display area A2 after the gamma correction is completed.

[0206] Some embodiments of the present disclosure also provide another luminance adjustment method, which comprises S100B-S300B.

[0207] S100B, acquiring the voltage drop data of the data signal transmitted from the first end 100A to the second end 100B of the display panel 100.

[0208] S200B, compensating the gray scale voltage of the display panel 100 according to the voltage drop data.

[0209] S300B, performing gamma correction on the display panel 100 based on the compensated gray scale voltage to obtain a gamma correction parameter.

[0210] As described above, after the gray scale voltage of the display panel 100 is compensated, the display panel 100 already has high luminance uniformity, so after the display panel 100 is subjected to gamma correction, different positions of the display panel 100 still have high luminance uniformity, thereby reducing the difference in luminance values of different positions of the display area A of the display panel 100.

[0211] In some embodiments, in S300B, “performing gamma correction on the display panel 100 based on the compensated gray scale voltage to obtain a gamma correction parameter” comprises S310B-S320B.

[0212] S310B, performing gamma correction on the main display area A1 based on the compensated gray scale voltage to obtain a first gamma correction parameter, the first gamma correction parameter being used to drive the pixels of the main display area A1 to display.

[0213] S320B, taking the first gamma correction parameter as a second gamma correction parameter used to drive the pixels of the transparent display area A2 to display.

[0214] By the above method, the gamma correction parameters of the main display area A1 and the transparent display area A2 can be obtained through one-time gamma correction, thereby saving the time for gamma correction.

[0215] In some examples, S320B can further include: performing gamma correction on the transparent display area A2 based on the compensated gray scale voltage to obtain the second gamma correction parameter used to drive the pixels of the transparent display area A2 to display.

[0216] That is, in this case, the main display area A1 and the transparent display area A2 of the display panel 100 are respectively subjected to gamma correction. In this way, the accuracy of the second gamma correction parameter of the transparent display area A2 can be further improved, and the luminance difference between the main display area A1 and the transparent display area A2 can be further reduced.

[0217] In some examples, after S300B, the above luminance adjustment method further includes: display defect debugging.

[0218] For example, the display defect debugging can include debugging of color mixing, debugging of abnormal color matching, and debugging of display luminance (such as the above-mentioned voltage drop compensation), etc.

[0219] The inventors of the present disclosure compared the display effect of the display panel debugged by using S100B-S300B with the display effect of the display panel debugged by using the following comparative example.

[0220] Comparative example scheme: S1, performing gamma correction on the main display area of the display panel.

[0221] S2, performing gamma correction on the transparent display area of the display panel.

[0222] S3, performing display defect debugging on the display panel.

[0223] In the comparison of the display effect of the display panel, three regions were selected for testing, and the three regions were: the center region of the main display area A1 (labeled NOR), the region of the main display area A1 close to the transparent display area A2 (labeled NOR'), and the transparent display area A2 (labeled FDC).

[0224] In the display panel debugged by using the comparative example, Figure 16aThe absolute luminance of different regions under different gray scales is shown, Figure 16b The percentage of luminance difference of FDC relative to NOR and the percentage of luminance difference of FDC relative to NOR' under different gray scales are shown, Figure 16c The value of color coordinate CIE-x of different regions under different gray scales and the standard value (STD-CIE-x) are shown, Figure 16d The percentage of difference of color coordinate CIE-x of FDC relative to NOR, the percentage of difference of color coordinate CIE-x of FDC relative to NOR' under different gray scales are shown, Figure 16e The value of color coordinate CIE-x of different regions under different gray scales and the standard value (STD-CIE-y) are shown, Figure 16f The percentage of difference of color coordinate CIE-y of FDC relative to NOR, the percentage of difference of color coordinate CIE-y of FDC relative to NOR' under different gray scales are shown. The horizontal coordinates of the above figures are gray scales.

[0225] In the display panel debugged using the S100B-S300B of the present disclosure, Figure 17a The absolute luminance of different regions under different gray scales is shown, Figure 17b The percentage of luminance difference of FDC relative to NOR and the percentage of luminance difference of FDC relative to NOR' under different gray scales are shown, Figure 17c The value of color coordinate CIE-x of different regions under different gray scales and the standard value (STD-CIE-x) are shown, Figure 17d The percentage of difference of color coordinate CIE-x of FDC relative to NOR, the percentage of difference of color coordinate CIE-x of FDC relative to NOR' under different gray scales are shown, Figure 17e The value of color coordinate CIE-x of different regions under different gray scales and the standard value (STD-CIE-y) are shown, Figure 17f The percentage of difference of color coordinate CIE-y of FDC relative to NOR, the percentage of difference of color coordinate CIE-y of FDC relative to NOR' under different gray scales are shown. The horizontal coordinates of the above figures are gray scales.

[0226] As can be seen from the above figures, the display panel debugged using the S100B-S300B of the present disclosure has smaller luminance difference and color coordinate difference, and has better display effect.

[0227] The various embodiments described herein can be implemented using, for example, a computer readable storage medium in the form of computer software, hardware or any combination thereof.

[0228] For hardware implementation, the embodiments described herein can be implemented by using at least one of application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, electronic devices, other electronic units designed to perform the functions described herein. In some cases, such embodiments can be implemented in a processor unit.

[0229] For software implementation, the embodiments such as procedures or functions can be implemented with separate software modules, such as procedures, functions, and / or operations, to allow one or more functions or operations to be performed. The software code can be written in any suitable programming language by any suitable programming method. The software code can be stored in a memory and executed by a processor unit.

[0230] As shown in Figure 18 Some embodiments of the present disclosure further provide an electronic device 10, including a memory 1 and a processor 2, wherein the memory 1 stores instructions executable by the processor 2, and the processor 2 is configured to execute the instructions to cause the electronic device 10 to implement one or more steps of the brightness adjustment method according to any one of the embodiments of the present disclosure.

[0231] The electronic device 10 is used for brightness adjustment of a display panel to be debugged, and by the electronic device, the brightness difference between the main display area and the transparent display area of the display panel is reduced, and the display effect of the display panel is improved.

[0232] The electronic device 10 is, for example, a gamma debugging device.

[0233] For example, the memory 1 mentioned in the embodiments of the present disclosure can include read-only memory and random access memory.

[0234] For example, the processor 2 mentioned in the embodiments of the present disclosure can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0235] It should be understood that the memory 1 and the processor 2 in the embodiments of the present disclosure can interact through a communication bus 3. The communication bus can include not only a data bus, but also a power bus, a control bus, and a status signal bus, etc. However, for the purpose of clarity, all kinds of buses are marked as communication buses in the figure.

[0236] Some embodiments of the present disclosure also provide a computer readable storage medium storing computer instructions executable on a processor 2, which when executed by the processor implement one or more steps of the brightness adjustment method as described above.

[0237] It should be noted that the computer readable storage medium provided by the embodiments of the present disclosure can include, but is not limited to: a magnetic storage device (for example, a hard disk, a floppy disk or a magnetic tape, etc.), a read-only memory (ROM), a random access memory (RAM), an erasable programmable read-only memory (EPROM), and various media capable of storing program codes.

[0238] Some embodiments of the present disclosure also provide a computer program product, which when running on a computer, causes the computer to perform one or more steps of the brightness adjustment method as described above.

[0239] The electronic device or the computer readable storage medium provided by the embodiments of the present disclosure are both used to execute the brightness adjustment method provided above, and thus the beneficial effects that can be achieved thereby can refer to the beneficial effects of the corresponding method provided above, which will not be described herein again.

[0240] The above merely provides a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can think of changes or replacements within the technical scope disclosed by the present disclosure, which should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A method for adjusting the brightness of a display panel, characterized in that, The display panel has a display area, which includes a main display area and a transparent display area. The light transmittance of the transparent display area is greater than that of the main display area. The brightness adjustment method includes: Gamma correction is performed on the main display area to obtain a first gamma correction parameter, which is used to drive the pixels of the main display area to display. Based on the first gamma correction parameter, a second gamma correction parameter is obtained, which is used to drive the pixels of the transparent display area to display; wherein, the first gamma correction parameter and the second gamma correction parameter ensure that the brightness difference between the main display area and the transparent display area when displaying the same grayscale is within a preset range; The display panel has multiple reference display brightness levels, the main display area corresponds to multiple sets of first gamma correction parameters, the transparent display area corresponds to multiple sets of second gamma correction parameters, and each reference display brightness level corresponds to a set of first gamma correction parameters and a set of second gamma correction parameters; The step of obtaining the second gamma correction parameter based on the first gamma correction parameter includes: A first brightness value curve and a second brightness value curve are obtained respectively. The first brightness value curve represents the correspondence between the reference display brightness level and the brightness value of the main display area, and the second brightness value curve represents the correspondence between the reference display brightness level and the brightness value of the transparent display area. Based on the first brightness value curve and the second brightness value curve, a display brightness level compensation curve is obtained. The display brightness level compensation curve represents the correspondence between the reference display brightness level and the compensated display brightness level of the transparent display area. The corresponding brightness values ​​of the reference display brightness level and the compensated display brightness level are the same. For each reference display brightness level, the compensated display brightness level corresponding to the reference display brightness level is obtained according to the display brightness level compensation curve. From multiple sets of first gamma correction parameters, a set of gamma correction parameters corresponding to the reference display brightness level with the same value as the compensated display brightness level is found, and used as a set of second gamma correction parameters corresponding to the reference display brightness level of the transparent display area.

2. The brightness adjustment method according to claim 1, characterized in that, The display panel is capable of displaying multiple gray levels at each of the reference display brightness levels; The steps of obtaining the first brightness value curve and the second brightness value curve respectively include: At each of the reference display brightness levels, the brightness value of the main display area and the brightness value of the transparent display area at the target grayscale are tested respectively; the target grayscale is one of the multiple grayscales. The first brightness value curve is obtained based on each of the reference display brightness levels and its corresponding brightness value of the main display area; The second brightness value curve is obtained based on each of the reference display brightness levels and the corresponding brightness value of the transparent display area.

3. The brightness adjustment method according to claim 1 or 2, characterized in that, The step of obtaining the display brightness level compensation curve based on the first brightness value curve and the second brightness value curve includes: Based on the first brightness value curve and the second brightness value curve, multiple reference display brightness levels are obtained where the brightness values ​​of the main display area and the transparent display area differ, and these are used as multiple target reference display brightness levels. For each target reference display brightness level, a reference display brightness level is obtained that corresponds to the transparent display area achieving the same brightness as the main display area, which is then used as the compensation display brightness level for the transparent display area. The display brightness level compensation curve is obtained based on each target reference display brightness level and its corresponding compensated display brightness level.

4. The brightness adjustment method according to claim 1, characterized in that, The display panel includes a first end close to the driving circuit and a second end away from the driving circuit; Before performing gamma correction on the main display area to obtain the first gamma correction parameter, the brightness adjustment method further includes: Obtain the voltage drop data of the data signal transmitted from the first end to the second end in the display panel; Based on the voltage drop data, the grayscale voltage of the display panel is compensated; The step of performing gamma correction on the main display area to obtain the first gamma correction parameter includes: Based on the compensated grayscale voltage, gamma correction is performed on the main display area to obtain the first gamma correction parameter.

5. The brightness adjustment method according to claim 1, characterized in that, The step of performing gamma correction on the main display area to obtain the first gamma correction parameter includes: Select a target area in the main display area, perform gamma correction on the target area to obtain gamma correction parameters, and use the obtained gamma correction parameters as the first gamma correction parameters. The target area is located between the center of the display panel and the transparent display area.

6. An electronic device, characterized in that, Including processor and memory; The memory stores instructions that the processor can execute; When the processor is configured to execute the instructions, the electronic device implements the brightness adjustment method as described in any one of claims 1 to 5.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that can run on a processor, which, when executed by the processor, implement the brightness adjustment method as described in any one of claims 1 to 5.

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