Brightness compensation method of display panel, display panel and display device

Abstract

The invention discloses a brightness compensation method of a display panel, the display panel and a display device. The brightness compensation method of the display panel comprises: acquiring a compensation center of a current display picture (S101); dividing a display area of the display panel into a plurality of areas to be compensated by taking the compensation center as a reference (S102); determining a brightness gain coefficient corresponding to each region to be compensated (S103); and according to the brightness gain coefficient, compensating the output brightness of each to-be-compensated region by applying a brightness compensation algorithm (S104).

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display, for example to a display panel brightness compensation method, display panel and display device. BACKGROUND

[0002] In a near-eye display device, due to the fact that the human eye receives light from different positions and different angles of the display screen, there is a problem of uneven spatial brightness distribution, which is often manifested as follows in visual perception: when the gaze point is located at the center of the screen, the brightness of the central region is relatively high, while the brightness of the edge region is relatively dark; when the gaze point moves, the brightness of the region close to the gaze point is relatively high, while the brightness of the region far from the gaze point is relatively dark.

[0003] To improve the uneven brightness distribution, related technologies mainly optimize from two directions of hardware structure and image processing algorithm. The hardware structure mainly realizes the equalization of regional brightness through the design of micro-lens tilt angle, the design of optical film layer gradient, and the adjustment of electrode resistivity / thickness. The image processing algorithm tends to adopt a globally uniform gain coefficient to linearly adjust the RGB pixel values of the image to improve the spatial brightness uniformity.

[0004] Traditional brightness adjustment modules usually adopt a globally uniform gain coefficient to linearly adjust the RGB pixel values of the image, but cannot perform regionalized and differentiated compensation for edge brightness deficiency or local brightness difference, so the effect of improving the spatial brightness uniformity is limited. SUMMARY

[0005] Embodiments of the present application provide a display panel brightness compensation method, display panel and display device, which considers the regional brightness compensation of the gaze point position, and the compensation center is adaptively determined according to system functions, so as to compensate for the brightness perception difference of different display regions, improve the spatial brightness uniformity of the display picture, and meet the visual needs of the human eye in the near-eye display scenario.

[0006] In a first aspect, embodiments of the present application provide a display panel brightness compensation method, comprising:

[0007] obtaining a compensation center of a current display picture;

[0008] dividing a display region of the display panel into a plurality of to-be-compensated regions based on the compensation center;

[0009] determining a brightness gain coefficient corresponding to each to-be-compensated region;

[0010] applying a brightness compensation algorithm to compensate for the output brightness of each to-be-compensated region according to the brightness gain coefficient.

[0011] Optionally, the compensation center of the current display picture is obtained, comprising:

[0012] obtain the coordinates of each pixel in the display area of the display panel;

[0013] If the system in which the display panel is located has an eye movement tracking function, the pixel coordinates corresponding to the gaze point output by the eye movement tracking module in real time are taken as the compensation center;

[0014] If the system in which the display panel is located does not have an eye movement tracking function, the pixel coordinates corresponding to the geometric center of the display area are taken as the compensation center.

[0015] Optionally, the display area of the display panel is divided into a plurality of to-be-compensated areas based on the compensation center, including:

[0016] A plurality of strip-shaped areas within a preset range from the edges of the display area are taken as edge areas, and the areas outside the edge areas are taken as center areas;

[0017] When the compensation center coincides with the geometric center of the display area, the widths of different edge areas are the same.

[0018] When the compensation center does not coincide with the geometric center of the display area, the widths of at least two edge areas are different.

[0019] Optionally, the display area of the display panel is divided into a plurality of to-be-compensated areas based on the compensation center, including:

[0020] A plurality of concentric circles are formed with the compensation center as the center, and each concentric circle forms an edge of a to-be-compensated area at the edge of the display area.

[0021] Optionally, the to-be-compensated areas include a center area, an inner ring area, a middle ring area, an outer ring area and an edge area arranged in sequence from the center.

[0022] Optionally, the luminance gain coefficient is pre-calibrated.

[0023] Optionally, according to the luminance gain coefficient, a luminance compensation algorithm is applied to compensate the output luminance of each to-be-compensated area, including:

[0024] Based on the luminance gain coefficient, the output luminance compensation is performed by using the following formula:

[0025] ;

[0026] Wherein, RGB in represents the original input pixel luminance value, and RGB outrepresents the output value after brightness compensation, level represents a brightness adjustment parameter that can be adjusted in software or configuration, the value range is 0~255, γ is a constant, represents a human eye perception non-linear correction coefficient, and coef represents a brightness gain coefficient that is respectively set according to different to-be-compensated regions.

[0027] Optionally, after the output brightness of each to-be-compensated region is compensated by applying the brightness compensation algorithm according to the brightness gain coefficient, the method further includes:

[0028] evaluating the brightness uniformity of the compensated display picture;

[0029] in response to the brightness uniformity of the compensated display picture not meeting the preset requirement, determining an updated brightness gain coefficient corresponding to each to-be-compensated region again;

[0030] compensating the output brightness of each to-be-compensated region according to the updated brightness gain coefficient until the brightness uniformity of the compensated display picture meets the preset requirement.

[0031] In a second aspect, an embodiment of the present application provides a display panel, which utilizes a brightness compensation method to improve the brightness uniformity of a display picture of the display panel.

[0032] In a third aspect, an embodiment of the present application provides a display device, which includes the display panel in the second aspect and a housing.

[0033] In a fourth aspect, an embodiment of the present application provides a display device, which includes:

[0034] a compensation center obtaining module configured to obtain a compensation center of a current display picture of the display panel;

[0035] a region division module configured to divide a display region of the display panel into a plurality of to-be-compensated regions with the compensation center as a reference;

[0036] a coefficient determining module configured to determine a brightness gain coefficient corresponding to each to-be-compensated region;

[0037] a brightness compensation module configured to compensate the output brightness of each to-be-compensated region by applying a brightness compensation algorithm according to the brightness gain coefficient. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a flowchart of a brightness compensation method of a display panel provided by an embodiment of the present application;

[0039] Figure 2 is a brightness distribution effect diagram of a display picture with a gaze point located at the center of a screen in visual perception;

[0040] Figure 3is a luminance distribution effect diagram of a display picture when a gaze point moves in visual perception;

[0041] Figure 4 is a region division schematic diagram of a luminance compensation method of a display panel provided by an embodiment of the present application;

[0042] Figure 5 is a region division schematic diagram of another luminance compensation method of a display panel provided by an embodiment of the present application;

[0043] Figure 6 is a ring region division schematic diagram of a luminance compensation method of a display panel provided by an embodiment of the present application;

[0044] Figure 7 is a ring region division schematic diagram of another luminance compensation method of a display panel provided by an embodiment of the present application;

[0045] Figure 8 is a grid region division schematic diagram of a luminance compensation method of a display panel provided by an embodiment of the present application;

[0046] Figure 9 is a flow chart of another luminance compensation method of a display panel provided by an embodiment of the present application;

[0047] Figure 10 is a schematic diagram of a display device provided by an embodiment of the present application;

[0048] Figure 11 is a schematic diagram of another display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0049] The terms used in the embodiments of the present application are merely for the purpose of describing particular embodiments and are not intended to limit the present application. It should be noted that the positional words such as "upper", "lower", "left", "right", and the like described in the embodiments of the present application are described in the angle shown in the drawings, and should not be understood as a limitation on the embodiments of the present application. In addition, in the context, it should also be understood that when referring to an element being formed "on" or "under" another element, it can be directly formed "on" or "under" another element, or indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second", and the like are only for the purpose of description and do not represent any order, number, or importance, but are only used to distinguish different components. The above terms in the present application can be understood according to the specific meaning of the terms by those skilled in the art according to the specific circumstances.

[0050] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The embodiment of the present application provides a display panel brightness compensation method, comprising: obtaining a compensation center of a current display picture; dividing a display area of the display panel into a plurality of to-be-compensated areas based on the compensation center; determining a brightness gain coefficient corresponding to each to-be-compensated area; and compensating the output brightness of each to-be-compensated area by applying a brightness compensation algorithm according to the brightness gain coefficient.

[0052] By adopting the above technical scheme, the display area of the display panel is divided into a plurality of to-be-compensated areas according to the obtained compensation center of the display picture, the corresponding brightness gain coefficient is introduced according to each different to-be-compensated area, and the output brightness of each to-be-compensated area is compensated by applying the brightness compensation algorithm, so that the brightness perception difference of different display areas is compensated, thereby improving the overall image brightness uniformity. The problems of screen edge brightness attenuation and brightness spatial non-uniformity existing in the display system are solved, the effect of compensating the key area covering the user visual attention area at all times is achieved, and the human eye visual demand in the near-eye display scene is met.

[0053] Figure 1 is a flowchart of a display panel brightness compensation method provided by the embodiment of the present application. The embodiment can be applicable to the case of compensating the center movement, edge brightness deficiency or local brightness difference in the display system. The method of the embodiment can be executed by a display device, which can be realized in the form of hardware and / or software. The device can be integrated in a display device, such as a head-mounted display, an augmented reality head-mounted display, a backlit liquid crystal display, an organic light-emitting diode (OLED) display screen or a micro light-emitting diode (Micro LED) display. The embodiment of the present application does not limit this.

[0054] As shown in Figure 1 , the display panel brightness compensation method comprises the following steps:

[0055] S101, obtaining a compensation center of a current display picture.

[0056] In the embodiments of the present application, the display screen can be understood as a core visual carrier for human-computer interaction, which is converted by a display device into an optical image region that can be perceived by human vision through a specific technology. The display screen includes but is not limited to a picture displayed by a head-mounted display, an augmented reality head-mounted display, a backlit liquid crystal display, an organic light-emitting diode (OLED) display screen, or a micro light-emitting diode (Micro LED) display. The embodiments of the present application do not limit the display screen. The compensation center can be understood as a core point where the gaze of the human eye naturally converges when observing the display screen. The compensation center moves with the movement of the gaze point of the human eye.

[0057] For example, for each pixel in each frame of image in the display screen, the two-dimensional coordinate information in the effective display screen is obtained, and the coordinate of the compensation center is obtained. By default, the compensation center is set as the geometric center of the screen. If the system has an eye movement tracking function, the position coordinate of the compensation center is dynamically updated according to the gaze point coordinate output by the eye movement tracking module in real time.

[0058] Optionally, the compensation center of the current display screen is obtained, including: obtaining the coordinates of each pixel in the display area of the display panel; if the system in which the display panel is located has an eye movement tracking function, the pixel coordinates corresponding to the gaze point output by the eye movement tracking module in real time are taken as the compensation center; if the system in which the display panel is located does not have an eye movement tracking function, the pixel coordinates corresponding to the geometric center of the display area are taken as the compensation center.

[0059] In the embodiments of the present application, the eye movement tracking function can be understood as a technology for measuring and recording the position, movement and gaze point of the eye through sensor technology. This technology can capture the eye movement information of the user in real time and convert the information into data that can be analyzed.

[0060] In the process of obtaining the compensation center of the display screen, for each pixel in each frame of image in the display area of the display panel, the two-dimensional coordinate information in the effective display screen is obtained, and the coordinate of the compensation center is obtained. If the system in which the display panel is located has an eye movement tracking function, the pixel coordinates corresponding to the gaze point output by the eye movement tracking module in real time are taken as the compensation center; if the system in which the display panel is located does not have an eye movement tracking function, the pixel coordinates corresponding to the geometric center of the display area are taken as the compensation center.

[0061] For example, when a user opens a display device to play a video, the display screen of the display device at this time is the playing screen in the movie player window. When a human eye watches a dynamic picture, the eye will naturally focus on the visual focus area in the picture to generate a gaze point. If the display device has an eye movement tracking function, the system will capture the user's eye movement trajectory and pupil focus position in real time through the built-in eye movement sensor, and will take the pixel coordinates corresponding to the gaze point output in real time by the eye movement tracking module as the compensation center of the display screen.

[0062] If the display device does not have an eye movement tracking function, the geometric center pixel coordinates of the display screen are used as the compensation center of the display screen by default.

[0063] The embodiment of the present application utilizes the adaptive ability of the compensation center. When the display system does not have an eye movement tracking function, the geometric center of the screen is used as the compensation center by default. If the display system has an eye movement tracking function, the gaze point coordinates output in real time by the eye movement tracking module are used to dynamically update the compensation center, so that the brightness compensation distribution is always optimized around the user's gaze position.

[0064] S102. Divide the display area of the display panel into a plurality of to-be-compensated areas based on the compensation center.

[0065] In the embodiment of the present application, the to-be-compensated area can be understood as a specific area in the display screen that needs special optimization according to user needs because of edge brightness attenuation or non-uniform brightness space. The to-be-compensated area includes but is not limited to the four corner areas of the display screen and the dark area of the picture edge, which is not limited in the embodiment of the present application.

[0066] After obtaining the compensation center of the display screen, the display area is divided into areas with different brightness based on the spatial coordinates of the pixels. The area far from the compensation center and close to the screen edge can be divided into one area, the area close to the compensation center can be divided into one area, and the position close to the four corners of the screen in the display screen can be divided into another area.

[0067] For example, if the system in which the display panel is located has eye movement tracking function, the system will capture the user's eye movement trajectory and pupil focus position in real time through the built-in eye movement sensor, and take the pixel coordinates corresponding to the gaze point output by the eye movement tracking module as the compensation center of the display picture. If the system in which the display panel is located does not have eye movement tracking function, the geometric center pixel coordinates of the display screen are taken as the compensation center of the display picture by default. After determining the compensation center of the display picture, the display picture is brighter and clearer near the compensation center. Although the transition area around the compensation center is not the core focus point of the user's gaze, it is close to the compensation center and the user's peripheral vision can still be perceived. If the picture quality is blurred, it will affect the overall experience and can be divided into a compensation area that needs to be compensated and the clarity needs to be improved. The area of the picture edge far from the compensation center has low brightness and few details, and if it is not processed, it will make the display picture rough, which can be divided into another compensation area.

[0068] S103, determine the brightness gain coefficient corresponding to each compensation area.

[0069] In the embodiments of the present application, the brightness gain coefficient is a core parameter used for adjusting or enhancing the original brightness signal of the device or system in the field of display technology and optical equipment, which can be understood as the area weight factor of the compensation area.

[0070] According to the brightness attenuation phenomenon and the brightness non-uniformity degree of each compensation area, the corresponding brightness gain coefficient is configured to adjust the brightness output of the compensation area. The brightness gain coefficient of the compensation area close to the compensation center can be set to a smaller value than the brightness gain coefficient of the compensation area far from the compensation center, and the brightness gain coefficients of the compensation areas close to the edge can be the same.

[0071] For example, when determining the brightness gain coefficient corresponding to the compensation area, the brightness gain coefficient is determined according to the brightness attenuation of the compensation area. The brightness gain coefficient of the compensation area close to the compensation center can be set to 1.00, and the brightness gain coefficient of the compensation area far from the compensation center can be set to 1.15. When the gaze point is taken as the compensation center, the distribution of the brightness gain coefficient will change radially around the gaze point, ensuring the uniformity of the brightness of the gaze area.

[0072] Optionally, the brightness gain coefficient is pre-calibrated.

[0073] For example, the luminance gain coefficient of the to-be-compensated area close to the compensation center in the display picture can be calibrated in advance as 1.00 to ensure clear details of the bright part, and the luminance gain coefficient of the edge to-be-compensated area far from the compensation center can also be calibrated in advance as 1.15. The region division parameter and the luminance gain coefficient can be flexibly adjusted, the method supports dynamic luminance adjustment requirements, and the user's visual experience in multiple scenes can be improved, and the overall luminance uniformity of the display picture can be improved.

[0074] S104, according to the luminance gain coefficient, applying a luminance compensation algorithm to compensate the output luminance of each to-be-compensated area.

[0075] In the embodiment of the present application, the luminance compensation algorithm is an algorithm for correcting the output luminance deviation of the display picture, image data or optical system in real time or on demand through software logic or a combination of software and hardware. For example, according to the corresponding luminance gain coefficient set according to different division regions, the luminance gain coefficient is applied to the luminance compensation algorithm to compensate the output luminance of the display panel to different degrees. The luminance compensation algorithm includes but is not limited to global luminance compensation, partition luminance compensation and pixel-level luminance compensation, which are not limited in the embodiment of the present application.

[0076] For example, the luminance gain coefficient is determined according to the luminance attenuation of the to-be-compensated area. The coefficient of the to-be-compensated area close to the compensation center can be set as 1.00, and the luminance gain coefficient of the edge to-be-compensated area far from the compensation center can be set as 1.15. The luminance gain coefficients of the two different regions are applied to the luminance compensation algorithm respectively, and the output luminance of multiple to-be-compensated areas is compensated and corrected to different degrees, so that the luminance of the entire display picture is consistent.

[0077] Optionally, according to the luminance gain coefficient, applying a luminance compensation algorithm to compensate the output luminance of each to-be-compensated area, comprising: based on the luminance gain coefficient, using the following formula to compensate the output luminance:

[0078] ;

[0079] Wherein, RGB in represents the input pixel original luminance value, RGB out represents the output value after luminance compensation, level represents the luminance adjustment parameter adjustable in software or configuration, the value range is 0~255, γ is a constant, represents the human eye perception non-linear correction coefficient, and coef represents the luminance gain coefficient, which is set according to different to-be-compensated areas.

[0080] The brightness compensation algorithm adopts a brightness gamma correction model based on brightness gain correction. The brightness gain coefficient of a region is introduced into the brightness gamma correction to construct a correction model, and a two-dimensional brightness compensation function coef(x, y) is established. The coordinates of each pixel in the region to be compensated are continuously mapped to the gain value, forming a more delicate and smoother transition brightness compensation. γ is usually 2.2. After calculating the output value after brightness compensation according to the model, the output result after brightness compensation is stored in a look-up table (LUT) for real-time table lookup and access, improving hardware efficiency.

[0081] For example, the current display screen played by the user is divided into a center region to be compensated and an edge region to be compensated according to the determined compensation center. The input pixel original brightness value RGB in may be 10. The brightness adjustment parameter Level in software or configuration can be 255. The human eye perception nonlinear correction coefficient γ is 2.2. The brightness gain coefficient coef is set to 1.00. At this time, the output value RGB out after brightness compensation is calculated based on the brightness compensation algorithm. The output result is stored in the LUT for real-time table lookup. This is achieved through region judgment logic and table lookup structure, without complex divider or floating point calculation module and with less hardware resource occupation, and is easy to integrate into the image enhancement pipeline in related technologies.

[0082] The brightness compensation method of the display panel provided in the embodiments of the present application obtains the compensation center of the display screen by using pixel coordinate information, divides the display region of the display panel into a plurality of regions to be compensated according to the brightness attenuation degree based on the compensation center, introduces corresponding brightness gain parameters according to different regions to be compensated, and compensates the output brightness of each region to be compensated by using a brightness compensation algorithm, which is close to the human eye visual perception characteristics. The brightness perception difference of different display regions is compensated, the overall image brightness consistency and display quality are improved, the high-precision brightness gain coefficient can be adjusted and synchronized in real time along with the dynamic adjustment of the compensation center, the brightness of the visual attention region is closest to the target value, and the display clarity and comfort of the gaze region are improved. The problems of screen edge brightness attenuation and non-uniform brightness space in the display system are solved, the visual attention region is always covered by the compensation focus, and the effect of meeting the human eye visual demand in the near-eye display scene is achieved.

[0083] Figure 2 is a brightness distribution effect diagram of a display screen in which the gaze point in visual perception is located at the center of the screen, Figure 3 is a brightness distribution effect diagram of a display screen when the gaze point moves in visual perception. Since the default gaze point is located at the center of the screen in visual perception, the brightness of the center region is relatively high, and the brightness of the edge region is relatively low. Referring to Figure 2When the gaze point moves, the surrounding area close to the gaze point is brighter, and the area far from the gaze point is dimmer. Referring to Figure 3 , the gaze point moves from the center of the screen to the upper right, and thus the present embodiment provides the following area division method to be compensated. Figure 4 is a schematic diagram of area division of a brightness compensation method of a display panel provided by the present embodiment. Figure 5 is a schematic diagram of area division of another brightness compensation method of a display panel provided by the present embodiment. As shown in Figure 4 and Figure 5 , the brightness compensation method of the display panel divides the display area of the display panel into a plurality of areas to be compensated with the compensation center 1 as the reference, including: dividing a plurality of strip-shaped areas within a preset range from the edges of the display area as the edge area 3, and dividing the area outside the edge area as the center area 2; wherein, referring to Figure 4 , when the compensation center 1 coincides with the geometric center of the display area, the widths of different edge areas 3 are the same; referring to Figure 5 , when the compensation center 1 does not coincide with the geometric center of the display area, the widths of at least two edge areas 3 are different.

[0084] In the present embodiment, the edge area 3 can be understood as an area close to the edge of the display screen and far from the compensation center; the center area 2 can be understood as an area close to the compensation center, and in general, the display brightness of the center area 2 is higher than that of the edge area 3. The geometric center of the display area can be understood as the center position of a plurality of sub-area sets in the display area.

[0085] If the system in which the display panel is located does not have an eye movement tracking function, referring to Figure 2 , when the default gaze point is the geometric center of the screen, the pixel coordinates corresponding to the geometric center of the display screen are taken as the compensation center 1. A plurality of strip-shaped areas within a preset range from the edges of the display area are divided as the edge area 3, and the widths of different edge areas 3 are the same; the area outside the edge area 3 is taken as the center area 2, and the pixel area close to the four corners of the screen row and column boundary is taken as the dark corner area 4. This area can be regarded as the intersection area in which the row and column coordinates are located within a certain proportion of the edge of the effective display range of the screen. Since the brightness of the center area 2 is often higher than that of the edge area 3 according to the near-eye display area brightness simulation diagram, and the brightness of the dark corner area 4 is often lower than that of other edge areas 3, it shows a more significant brightness attenuation effect. The present embodiment separately identifies the dark corner area 4 on the basis of the original center area 2 and edge area 3, and configures a higher brightness gain coefficient for the dark corner area 4. If the system in which the display panel is located has an eye movement tracking function, referring to Figure 3, the luminance gain coefficient distribution of the dark corner area 4 can be dynamically adjusted by the movement of the gaze point, so that the center 1 can dynamically adjust to keep the luminance gain coefficient distribution of the dark corner area 4 relative to the user's gaze area reasonable gradient.

[0086] For example, when the system in which the display panel is located does not have eye movement tracking function, the default gaze point is the geometric center of the screen, and the pixel coordinates corresponding to the geometric center of the display screen are taken as the compensation center 1. The area close to the upper and lower and left and right 10% of the effective display range of the screen is divided into edge area 3, and the widths of different edge areas 3 are the same; the area outside the edge area 3 is the center area 2, and the intersection area close to the edge 10% of the screen row and column coordinates within the effective display range of the screen is divided into the dark corner area 4. When the system in which the display panel is located has eye movement tracking function, if the gaze point moves to the right and up, the compensation center 1 does not coincide with the geometric center of the display screen, the center area 2 is re-divided with the gaze point as the new reference point, and the whole moves to the right and up, the range of the original edge area 3 close to the upper and right sides is reduced, and the range of the dark corner area 4 close to the upper left, lower left and lower right is increased, and higher luminance gain coefficient needs to be configured.

[0087] The embodiment of the present application dynamically divides the display area into center area 2, edge area 3 and dark corner area 4 according to whether the system in which the display panel is located has eye movement tracking function. When the system does not have eye movement tracking function, the default gaze point is the geometric center of the screen, and the pixel coordinates corresponding to the geometric center of the display screen are taken as the compensation center 1. A plurality of strip-shaped areas in a preset range from the edges of the display area to within the edges are taken as edge areas 3, and the widths of different edge areas 3 are the same, the area outside the edge area 3 is the center area 2, and the pixel area close to the four corners of the screen row and column boundary is taken as the dark corner area 4. If the system in which the display panel is located has eye movement tracking function, the compensation center 1 can be dynamically adjusted according to the gaze point, and different areas to be compensated are divided according to the compensation center 1. This setting makes the compensation center 1 have adaptive ability, can effectively correct the problem of insufficient brightness of the dark corner area 4, realize the effect that the brightness compensation distribution is always optimized around the user's gaze position, and improve the overall uniformity of the display picture and the user's visual comfort.

[0088] Optionally, Figure 6 is a ring area division schematic diagram of a display panel luminance compensation method provided by the embodiment of the present application. Figure 7 is another ring area division schematic diagram of a display panel luminance compensation method provided by the embodiment of the present application. As shown in Figure 6 and Figure 7 The display area of the display panel is divided into a plurality of areas to be compensated with the compensation center 1 as the reference, including: forming a plurality of concentric circles with the compensation center 1 as the center, and the edges of each concentric circle in the display area form the edges of the area to be compensated.

[0089] Optionally, the to-be-compensated area includes, from the center outward, a center area 2, an inner ring area 5, a middle ring area 6, an outer ring area 7, and an edge area 3.

[0090] In the embodiments of the present application, the center area 2, the inner ring area 5, the middle ring area 6, the outer ring area 7, and the edge area 3 can be sequentially divided from near to far according to the distance from the compensation center 1.

[0091] If the system in which the display panel is located does not have an eye movement tracking function, and the default gaze point is the geometric center of the screen, the compensation center 1 and the geometric center of the display screen coincide, and the compensation center 1 is taken as the reference, a plurality of concentric circular areas are divided along the radial direction, including the center area 2, the inner ring area 5, the middle ring area 6, the outer ring area 7, and the edge area 3 in turn. Each circular area is divided according to its relative position from the compensation center 1, forming a structure that increases layer by layer from the inside to the outside. If the system in which the display panel is located has an eye movement tracking function, when the gaze point moves to the upper right, the original concentric circles with the geometric center of the display screen as the center will be re-divided into the to-be-compensated area with the gaze point as the new center, the area close to the gaze point becomes the center area 2, and the areas away from the gaze point are divided into the inner ring area 5, the middle ring area 6, the outer ring area 7, and the edge area 3 in turn.

[0092] For example, taking the determined compensation center 1 as the reference, the center area 2, the inner ring area 5, the middle ring area 6, the outer ring area 7, and the edge area 3 are sequentially divided along the radial direction, and a luminance gain coefficient is set for each ring area. The luminance gain coefficient of the center area 2 can be set to 1.00, the luminance gain coefficient of the inner ring area 5 can be set to 1.15, the luminance gain coefficient of the middle ring area 6 can be set to 1.17, the luminance gain coefficient of the outer ring area 7 can be set to 1.19, and the luminance gain coefficient of the edge area 3 can be set to 1.2. The circular area closer to the edge of the screen is usually perceived to have lower brightness, and the luminance gain coefficient is set to be higher.

[0093] The display panel brightness compensation method provided by the embodiment of the present application utilizes the radial decreasing characteristic of screen brightness in a near-eye display system, that is, the characteristic that the brightness gradually decays from the center to the edge, dynamically adjusts the compensation center 1 according to whether the system in which the display panel is located has the eye movement tracking function, and divides the multiple annular to-be-compensated regions based on the compensation center 1. If the system in which the display panel is located does not have the eye movement tracking function, the compensation center 1 coincides with the geometric center of the display screen, and the center region 2, the inner ring region 5, the middle ring region 6, the outer ring region 7 and the edge region 3 are divided along the radial direction based on the compensation center 1. If the system in which the display panel is located has the eye movement tracking function, when the gaze point moves to the upper right, the concentric rings originally taking the geometric center as the center are re-divided to be the to-be-compensated regions taking the gaze point as the new center. The brightness gain coefficients are set for each annular region, and the brightness gain coefficient is set to be higher for the annular region closer to the edge of the screen, thereby realizing the step-by-step compensation for the brightness decay, making the brightness compensation have the characteristics of gradualness and strong continuity, effectively avoiding the visual discomfort caused by the brightness mutation between different regions, and realizing the natural transition and smooth correction of the brightness distribution.

[0094] Optionally, Figure 8 is a grid region division schematic diagram of a display panel brightness compensation method provided by the embodiment of the present application. As shown in Figure 8 , the display region is divided into multiple equal-interval intervals along the horizontal and vertical directions, thereby dividing the entire display picture into MxN regular rectangular grid regions, each of which can be an independent to-be-compensated region and has an independent brightness correction parameter.

[0095] For example, according to the proportion of the display screen, the display region can be divided into 3 equal-interval intervals along the horizontal direction of the display screen and 3 equal-interval intervals along the vertical direction of the display screen, and the entire display region is divided into 3x3=9 regular rectangular grid regions through the intersection of the 3 intervals along the horizontal direction and the 3 intervals along the vertical direction, each of which is an independent to-be-compensated region. The brightness deviation of each grid region is detected, the compensation demand is determined, an independent brightness gain coefficient is configured for each grid region, and the display brightness is corrected.

[0096] The display panel brightness compensation method provided by the embodiment of the present application divides the to-be-compensated region in the grid region division manner, divides the display region into multiple equal-interval intervals along the horizontal and vertical directions, thereby dividing the entire display picture into regular rectangular grid regions, and each of the rectangular grid regions can be an independent to-be-compensated region. The method of dividing the to-be-compensated region in the grid manner has higher spatial resolution and can adapt to complex and asymmetric brightness distribution characteristics.

[0097] Optionally, Figure 9is a flowchart of another brightness compensation method of a display panel provided in the embodiments of the present application.

[0098] Reference Figure 9 The brightness compensation method comprises the following steps.

[0099] S201, a compensation center of a current display picture is acquired.

[0100] S202, the display area of the display panel is divided into a plurality of to-be-compensated areas based on the compensation center.

[0101] S203, a brightness gain coefficient corresponding to each to-be-compensated area is determined.

[0102] S204, according to the brightness gain coefficient, a brightness compensation algorithm is applied to compensate the output brightness of each to-be-compensated area.

[0103] S205, the brightness uniformity of the compensated display picture is evaluated.

[0104] S206, if the brightness uniformity of the compensated display picture does not meet the preset requirement, the brightness gain coefficient is updated.

[0105] That is, when the brightness uniformity of the compensated display picture does not meet the preset requirement, the updated brightness gain coefficient corresponding to each to-be-compensated area is determined again; S203-S205 are repeatedly executed, and the output brightness of each to-be-compensated area is compensated according to the updated brightness gain coefficient, until the brightness uniformity of the compensated display picture meets the preset requirement.

[0106] S207, if the brightness uniformity of the compensated display picture meets the preset requirement, the compensated display picture is output.

[0107] That is, when the brightness uniformity of the compensated display picture meets the preset requirement, the compensated display picture is output.

[0108] In the embodiments of the present application, the brightness uniformity is an index for measuring the consistency degree of brightness at different positions in the entire effective display area of the display device, and in the ideal state, the brightness of any point in the display area should be completely the same, without obvious "bright area", "dark area" or "dark corner".

[0109] After the output luminance of each to-be-compensated region is compensated by applying the luminance compensation algorithm, the luminance uniformity of the compensated display picture is evaluated and feedback optimized. The luminance consistency of the processed picture is evaluated by using the luminance uniformity test method conforming to the Video Electronics Standards Association Flat Panel Display Measurements Standard V2.0 (VESA FPDM V2.0), for example, the nine-square grid method. According to the Luminance Uniformity defined in the VESA FPDM V2.0, the luminance uniformity needs to meet the following conditions:

[0110]

[0111] wherein, L min represents the minimum luminance on the display screen, and L max represents the maximum luminance on the display screen.

[0112] If the luminance uniformity of the compensated display picture meets the condition that the ratio of the minimum luminance L min on the display screen to the maximum luminance L max on the display screen is ≥ 85%, the compensated display picture is output; if the luminance uniformity of the compensated display picture does not meet this measurement standard, the luminance gain coefficient corresponding to each to-be-compensated region is re-determined, and the output luminance of each to-be-compensated region is compensated again according to the updated luminance gain coefficient, until the luminance uniformity of the compensated display picture meets this standard.

[0113] For example, after the luminance compensation, the luminance uniformity of the output display picture is evaluated, the display region is divided into 5 equal parts along the horizontal and vertical directions according to the industry common “5x5 grid test method”, forming a regular grid of 5 rows and 5 columns, generating 25 test points covering the center, the four corners and the midpoint of the four sides, and a luminance meter is aligned with the 25 test points in turn, recording the actual luminance value of each point, finding the minimum luminance L min on the display screen and the maximum luminance L max on the display screen, if the ratio of the minimum luminance L min on the display screen to the maximum luminance L max on the display screen is ≥ 85%, the luminance uniformity of the compensated display picture meets the measurement standard, and the compensated display picture is output; if the ratio of the minimum luminance L min on the display screen to the maximum luminance L max on the display screen is < 85%, the luminance uniformity of the compensated display picture does not meet the measurement standard, and the luminance gain coefficient corresponding to each to-be-compensated region is re-determined, and the output luminance of each to-be-compensated region is compensated again according to the updated luminance gain coefficient, until the luminance uniformity of the compensated display picture meets the measurement standard.If the ratio of the maximum value to the minimum value of the display image after compensation is less than 85%, the brightness uniformity of the display image after compensation does not meet the measurement standard, the brightness gain coefficient corresponding to each to-be-compensated region is re-determined, the output brightness of each to-be-compensated region is compensated again according to the updated brightness gain coefficient, and the brightness uniformity is evaluated again, until the brightness uniformity of the display image after compensation meets the measurement standard, and the display image after compensation is output.

[0114] The brightness compensation method of the display panel provided in the embodiments of the present application is used to compensate the output brightness of each to-be-compensated region by using a brightness compensation algorithm, and then evaluate the brightness uniformity and consistency of the display image after compensation according to VESA FPDM V2.0. If the brightness uniformity and consistency of the display image after compensation do not meet the brightness uniformity standard, the brightness gain coefficient is updated according to the divided regions, and the brightness compensation is performed again until the brightness uniformity of the display image after compensation meets the standard. By evaluating the brightness uniformity of the display image after compensation, the brightness uniformity and consistency of the display image are ensured, and the brightness gain coefficient of the to-be-compensated region can be flexibly adjusted, dynamic brightness adjustment is supported, the user's visual experience in multiple scenes is improved, and the visual balance is further optimized.

[0115] The embodiments of the present application also provide a display panel and a display device, Figure 10 is a schematic diagram of a device provided in the embodiments of the present application, referring to Figure 10 The display device 8 includes a display panel 9 and a housing 10, and the brightness uniformity of the display image of the display panel 9 is improved by using the brightness compensation method in any of the above multiple optional embodiments.

[0116] The display panel 9 provided in the embodiments of the present application is used to obtain a compensation center of the display image by using pixel coordinate information, divide the display region of the display panel 9 into multiple to-be-compensated regions according to the brightness attenuation degree based on the compensation center, introduce corresponding brightness gain coefficients according to different to-be-compensated regions, and compensate the output brightness of each to-be-compensated region by using a brightness compensation algorithm, which is more close to the human eye visual perception characteristics. The brightness perception difference of different display regions is compensated, the overall image brightness consistency and display quality are improved, the high-precision brightness gain coefficient can be adjusted and synchronized in real time with the dynamic adjustment of the compensation center, the brightness of the visual attention region is ensured to be closest to the target value, and the display clarity and comfort of the gaze region are improved. The problems of screen edge brightness attenuation and brightness spatial non-uniformity in the display system are solved, the visual attention region of the user is always covered by the compensation focus, and the effect of meeting the human eye visual demand in the near-eye display scene is achieved.

[0117] Referring to Figure 10 The embodiments of the present application provide a display device 8 including a display panel 9.

[0118] The display device 8 provided by the embodiment of the present application compensates the center of the display screen by using the pixel coordinate information, divides the display area of the display panel 9 into a plurality of to-be-compensated areas according to the luminance attenuation degree based on the compensation center, introduces corresponding luminance gain coefficients according to different to-be-compensated areas, and compensates the output luminance of each to-be-compensated area by using the luminance compensation algorithm, so as to be closer to the visual perception characteristics of the human eye. The luminance perception difference of different display areas is compensated, the overall image luminance consistency and display quality are improved, the high-precision luminance gain coefficient can be adjusted and synchronized in real time along with the dynamic adjustment of the compensation center, the luminance of the visual attention area is ensured to be closest to the target value, and the display clarity and comfort of the gaze area are improved. The problems of screen edge luminance attenuation and luminance spatial non-uniformity in the display system are solved, the effect of compensating the key area to cover the visual attention area of the user at all times is achieved, and the visual requirements of the human eye in the near-eye display scene are met.

[0119] Reference Figure 11 The display device 8 provided by the embodiment of the present application includes a compensation center acquisition module 801 configured to acquire the compensation center of the current display screen of the display panel, a region division module 802 configured to divide the display area of the display panel into a plurality of to-be-compensated areas based on the compensation center, a coefficient determination module 803 configured to determine the luminance gain coefficient corresponding to each to-be-compensated area, and a luminance compensation module 804 configured to compensate the output luminance of each to-be-compensated area by using the luminance compensation algorithm according to the luminance gain coefficient.

Claims

1. A brightness compensation method of a display panel, comprising: obtaining a compensation center of a current display picture; dividing a display area of the display panel into a plurality of to-be-compensated areas based on the compensation center; determining a brightness gain coefficient corresponding to each of the to-be-compensated areas; compensating output brightness of each of the to-be-compensated areas by using a brightness compensation algorithm according to the brightness gain coefficient.

2. The brightness compensation method of a display panel according to claim 1, wherein, The obtaining of the compensation center of the current display picture comprises: obtaining coordinates of each pixel in the display area of the display panel; if the system in which the display panel is located has an eye tracking function, taking pixel coordinates corresponding to a gaze point output by an eye tracking module in real time as the compensation center; if the system in which the display panel is located does not have an eye tracking function, taking pixel coordinates corresponding to a geometric center of the display area as the compensation center.

3. The brightness compensation method of a display panel according to claim 2, wherein, The dividing of the display area of the display panel into the plurality of to-be-compensated areas based on the compensation center comprises: taking a plurality of strip-shaped areas in a preset range from edges of the display area as edge areas, and taking an area outside the edge areas as a center area; wherein, when the compensation center coincides with the geometric center of the display area, widths of different edge areas are the same; when the compensation center does not coincide with the geometric center of the display area, widths of at least two edge areas are different.

4. The brightness compensation method of a display panel according to claim 2, wherein, The dividing of the display area of the display panel into the plurality of to-be-compensated areas based on the compensation center comprises: forming a plurality of concentric circles with the compensation center as a center, and forming edges of the to-be-compensated areas by edges of each of the concentric circles in the display area.

5. The brightness compensation method of a display panel according to claim 4, wherein, The to-be-compensated areas comprise a center area, an inner ring area, a middle ring area, an outer ring area and an edge area arranged in sequence from the center.

6. The brightness compensation method of a display panel according to claim 1, wherein, The brightness gain coefficient is pre-calibrated.

7. The brightness compensation method of a display panel according to claim 1, wherein, The compensating of the output brightness of each of the to-be-compensated areas by using the brightness compensation algorithm according to the brightness gain coefficient comprises: compensating the output brightness based on the brightness gain coefficient by using the following formula: ； wherein RGB in represents the input pixel original luminance value, RGB out represents the output value after luminance compensation, level represents a luminance adjustment parameter that can be adjusted in software or configuration, with a value range of 0~255, γ is a constant, representing a human eye perception non-linear correction coefficient, and coef represents a luminance gain coefficient, which is set according to different areas to be compensated. 8.The brightness compensation method of the display panel according to claim 1, after the compensating of the output brightness of each of the to-be-compensated areas by using the brightness compensation algorithm according to the brightness gain coefficient, further comprising: evaluating brightness uniformity of a compensated display picture; in response to the brightness uniformity of the compensated display picture not satisfying a preset requirement, re-determining an updated brightness gain coefficient corresponding to each of the to-be-compensated areas; compensating the output brightness of each of the to-be-compensated areas according to the updated brightness gain coefficient until the brightness uniformity of the compensated display picture satisfies the preset requirement. 9.A display panel, wherein brightness uniformity of a display picture of the display panel is improved by using the brightness compensation method according to any one of claims 1 to 8. 10.A display device, comprising the display panel according to claim 9 and a housing. 11.A display device, comprising: a compensation center obtaining module configured to obtain a compensation center of a current display picture of a display panel; The area division module is configured to divide a display area of the display panel into a plurality of to-be-compensated areas based on the compensation center; The coefficient determination module is configured to determine a luminance gain coefficient corresponding to each of the to-be-compensated areas; The luminance compensation module is configured to compensate an output luminance of each of the to-be-compensated areas by using a luminance compensation algorithm according to the luminance gain coefficient.

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