CN118658417A - Brightness compensation method and device for display panel and display device - Google Patents

Brightness compensation method and device for display panel and display device Download PDF

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Publication number
CN118658417A
CN118658417A CN202311207037.7A CN202311207037A CN118658417A CN 118658417 A CN118658417 A CN 118658417A CN 202311207037 A CN202311207037 A CN 202311207037A CN 118658417 A CN118658417 A CN 118658417A
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China
Prior art keywords
display
brightness
monochrome
area
display brightness
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刘云杰
夏曾强
张文兆
张春雷
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Kunshan Govisionox Optoelectronics Co Ltd
Hefei Visionox Technology Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
Hefei Visionox Technology Co Ltd
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Priority to CN202311207037.7A priority Critical patent/CN118658417A/en
Publication of CN118658417A publication Critical patent/CN118658417A/en
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Abstract

The invention discloses a brightness compensation method and device of a display panel and a display device. The display panel comprises a plurality of display areas, the power supply voltage of the sub-pixels with different colors in each display area is independently controlled, and the brightness compensation method of the display panel comprises the following steps: acquiring monochromatic currents of sub-pixels with different colors in each display area under at least one preset display brightness level; determining the monochrome display brightness of each display area according to the monochrome current; the brightness of the display panel is compensated according to the monochrome display brightness and the monochrome target display brightness. The mura information of each display area is determined through the monochromatic current, so that the time consumption for collecting the mura information can be shortened, the cost for compensating the brightness of the display panel is reduced, and meanwhile, the influence of PWM dimming on the mura information is avoided. And the compensation effect of the mura phenomenon of the low gray scale and the second dimming area can be improved in the subsequent steps. Meanwhile, the mura phenomenon of the display panel can be compensated in real time.

Description

Brightness compensation method and device for display panel and display device
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a brightness compensation method and device of a display panel and a display device.
Background
Mura refers to a phenomenon in which brightness within a display panel is not uniform, resulting in various display marks. In order to solve the problem, mura is generally improved by improving the manufacturing process of the display panel and external compensation technique. However, the above method has a poor effect of improving the mura phenomenon.
Disclosure of Invention
The invention provides a brightness compensation method and device of a display panel and a display device, so as to improve the display uniformity of the display panel.
In a first aspect, an embodiment of the present invention provides a brightness compensation method for a display panel, where the display panel includes a plurality of display areas, and power supply voltages of sub-pixels of different colors in each of the display areas are independently controlled, the brightness compensation method for the display panel includes:
Acquiring monochromatic currents of sub-pixels with different colors in each display area under at least one preset display brightness level;
Determining the monochrome display brightness of each display area according to the monochrome current;
And compensating the brightness of the display panel according to the single-color display brightness and the single-color target display brightness.
Optionally, the display brightness level of the display panel includes a first dimming area display brightness level and a second dimming area display brightness level; obtaining the monochromatic current of the sub-pixels with different colors in each display area under at least one preset display brightness level comprises the following steps:
And acquiring the monochromatic current of the subpixels with different colors in each display area under the display brightness level of at least one first dimming area and the monochromatic current under the display brightness level of at least one second dimming area.
Optionally, determining the monochrome display brightness of each display area according to the monochrome current includes:
And determining the single-color display brightness of each display area in the first dimming area according to the single-color current of the display brightness level of the first dimming area, and determining the single-color display brightness of each display area in the second dimming area according to the single-color current of the display brightness level of the second dimming area.
Optionally, compensating the brightness of the display panel according to the monochrome display brightness and the monochrome target display brightness includes:
Compensating the brightness of the display panel according to the single-color display brightness of the first dimming area and the first single-color target display brightness, and compensating the brightness of the display panel according to the single-color display brightness of the second dimming area and the second single-color target display brightness;
Preferably, when the display brightness level of the first dimming area includes a plurality of display brightness levels, when the monochrome display brightness of the same color sub-pixels corresponding to different gray scales is the same under different display brightness levels of the first dimming area, compensating the brightness of the display panel under the condition corresponding to the same monochrome display brightness according to the current monochrome display brightness of the first dimming area and the first monochrome target display brightness;
Preferably, when the display brightness level of the second dimming area includes a plurality of display brightness levels, when the monochrome display brightness of the same color sub-pixels corresponding to different gray scales is the same under different display brightness levels of the second dimming area, the brightness of the display panel under the condition corresponding to the same monochrome display brightness is compensated according to the current monochrome display brightness of the second dimming area and the second monochrome target display brightness.
Optionally, the monochromatic current comprises monochromatic currents corresponding to different gray scales; determining the monochrome display brightness of each display area according to the monochrome current, comprising:
and determining the monochrome display brightness in different gray scales in each display area according to the monochrome current in different gray scales.
Optionally, compensating the brightness of the display panel according to the monochrome display brightness and the monochrome target display brightness includes:
Determining a monochromatic brightness compensation value of sub-pixels with different colors in each display area according to the monochromatic display brightness and the monochromatic target display brightness;
determining gamma curves of sub-pixels with different colors in each display area according to the single-color display brightness under different gray scales;
Determining compensation gray scales of sub-pixels with different colors in each display area according to the single-color brightness compensation value and the gamma curve;
and compensating the brightness of the sub-pixels with different colors in each display area according to the compensation gray scale.
Optionally, determining the gamma curve of the sub-pixels of different colors in each display area according to the single-color display brightness at different gray scales includes:
Fitting gamma curves of sub-pixels with different colors in each display area according to the single-color display brightness under different gray scales.
Optionally, determining the monochrome display brightness of each display area according to the monochrome current includes:
And calculating the monochrome display brightness of each display area according to the monochrome current and the dot current efficiency of the sub-pixels of the corresponding color.
In a second aspect, an embodiment of the present invention further provides a brightness compensation device for a display panel, where the display panel includes a plurality of display areas, and power supply voltages of sub-pixels of different colors in each of the display areas are independently controlled, and the brightness compensation device for the display panel includes:
The acquisition module is used for acquiring monochromatic currents of the sub-pixels with different colors in each display area under at least one preset display brightness level;
a determining module, configured to determine a monochrome display luminance of each display area according to the monochrome current;
And the compensation module is used for compensating the brightness of the display panel according to the monochrome display brightness and the monochrome target display brightness.
In a third aspect, an embodiment of the present invention further provides a display apparatus, including the luminance compensation apparatus of the display panel in the second aspect.
According to the technical scheme provided by the embodiment of the invention, the time for acquiring mura information can be shortened, the equipment for acquiring the mura information is not required to be additionally arranged, the cost for compensating the brightness of the display panel is reduced, and meanwhile, the influence of PWM dimming on the mura information is avoided by acquiring the monochromatic currents of the sub-pixels with different colors in each display area under at least one preset display brightness level and then determining the monochromatic display brightness of each display area according to the monochromatic currents. And the monochromatic current can be obtained at the low gray level, so that the mura information of the low gray level of the display panel can be obtained, and the compensating effect of the mura phenomenon of the low gray level and the second dimming area can be improved in the subsequent steps. Meanwhile, the monochromatic current can be continuously obtained, so that the mura phenomenon of the display panel can be compensated in real time. And the accuracy of the display panel brightness compensation is improved.
Drawings
FIG. 1 is a schematic view of a partial cross-sectional structure of an auxiliary electrode according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a flowchart of a brightness compensation method of a display panel according to an embodiment of the present invention;
FIG. 4 is a flowchart of another brightness compensation method for a display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a brightness compensation device of a display panel according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the prior art, mura phenomenon of the display panel can be improved by improving the manufacturing process of the display panel. However, a part of mura phenomenon cannot be improved by the process of the display panel, and an external compensation technique is required for improving the mura phenomenon of the display panel, that is Demura. When Demura is adopted to improve the mura phenomenon, mura information of the display panel can be captured by a high-resolution camera, and then corresponding compensation is performed according to the mura information. When the display panel carries out Demura, the Demura camera for capturing mura information is used for increasing the brightness compensation cost, the Demura camera cannot capture the mura form under low gray scale, meanwhile, the Demura camera photographing time is longer, only the mura information generated by the display panel can be stored, and the PWM dimming influences the camera photographing, so that the Demura has poorer compensation effect on the mura phenomenon of low gray scale and PWM dimming, the Demura site consumes longer time, and the mura information in the working process of the display panel cannot be continuously collected, so that the real-time mura phenomenon of the display panel cannot be compensated. The display panel comprises a light emitting device, a pixel driving circuit and a light emitting control signal line, wherein the light emitting control signal provided on the light emitting control signal line can be a pulse width modulation (Pulse width modulation, PWM) signal for controlling the time for the pixel driving circuit to drive the light emitting device to emit light so as to control the brightness of the display panel, namely PWM dimming.
In view of the above technical problems, an embodiment of the present invention provides a brightness compensation method for a display panel. The brightness compensation method of the display panel can be used for compensating the brightness of the display panel so as to improve the display uniformity of the display panel. When the brightness compensation method of the display panel is used for compensating the brightness of the display panel, the display panel can comprise a plurality of display areas, and the power supply voltages of the sub-pixels with different colors in each display area are independently controlled, so that the monochromatic currents of the sub-pixels with different colors in each display area can be respectively obtained. Illustratively, the display panel includes a substrate, and sub-pixels and auxiliary electrodes disposed on the substrate. Each sub-pixel comprises an Organic Light-Emitting Diode (OLED), each sub-pixel corresponds to one auxiliary electrode, and the auxiliary electrode is arranged on one side of the sub-pixel far away from the substrate, surrounds the corresponding sub-pixel, is electrically connected with the cathode of the OLED in the sub-pixel, and is used for providing power supply voltage for the cathode of the OLED. Fig. 1 is a schematic diagram of a partial cross-sectional structure of an auxiliary electrode according to an embodiment of the present invention. The auxiliary electrode includes a connection portion 1311 and a hanging portion 1312; the connection portion 1311 is disposed on one side of the substrate, the suspension portion 1312 is disposed on a side of the connection portion 1311 away from the substrate, and an orthographic projection of the suspension portion 1312 on the substrate is larger than an orthographic projection of the connection portion 1311 on the substrate, so as to form a suspension structure on the connection portion 1311. The connection 1311 may be a conductive structure. When electrically connected to the corresponding OLED, it may be electrically connected to the cathode of the corresponding OLED through the connection portion 1311. The structural design can be used for evaporating the OLED organic light-emitting layer without adopting a precise mask, so that the resolution ratio can be improved. Fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention. As shown in fig. 2, the display panel may include 3*5 display regions 101, each display region 101 including a plurality of different-color sub-pixels. In the same display area 101, the auxiliary electrodes corresponding to the sub-pixels of the same color are electrically connected, and the auxiliary electrodes of the sub-pixels of different colors are independent from each other. And the auxiliary electrodes corresponding to the sub-pixels in different display areas 101 are independent of each other, so that the independent control of the power supply voltages of the sub-pixels with different colors in each display area 101 can be realized, and the power supply voltages of the sub-pixels with the same color in the same display area 101 are the same. Illustratively, each display area 101 may include a plurality of red subpixels, a plurality of green subpixels, and a plurality of blue subpixels. In each display area 101, the auxiliary electrodes corresponding to all red sub-pixels are electrically connected, the auxiliary electrodes corresponding to all green sub-pixels are electrically connected, the auxiliary electrodes corresponding to all blue sub-pixels are electrically connected, and the auxiliary electrodes corresponding to the sub-pixels in different display areas 101 are mutually independent, so that the independent control of the power supply voltages of the sub-pixels in different colors in each display area 101 can be realized.
Fig. 3 is a flowchart of a method for compensating brightness of a display panel according to an embodiment of the present invention, where the method may be performed by a brightness compensating device of the display panel, as shown in fig. 3, and the method includes the following steps:
s110, acquiring monochromatic currents of sub-pixels with different colors in each display area under at least one preset display brightness level;
Referring to fig. 2 and 3, the monochrome current of the same color sub-pixel in each display area 101 is the sum of the driving currents of the same color sub-pixels in the display area 101. Illustratively, when the display area 101 includes a plurality of red sub-pixels, a plurality of green sub-pixels, and a plurality of blue sub-pixels, in the display area 101, the monochrome current of the red sub-pixels is the sum of the driving currents of all the red sub-pixels, the monochrome current of the green sub-pixels is the sum of the driving currents of all the green sub-pixels, and the monochrome current of the blue sub-pixels is the sum of the driving currents of all the blue sub-pixels. At this time, at the same preset display brightness level, each display area 101 includes three monochromatic currents, and when the display panel has 3*5 =15 display areas 101, there are 15×3=45 monochromatic currents. In addition, when the display brightness levels of the display panel are different, the corresponding driving currents of the sub-pixels under the same gray level are different, so that the monochrome currents of the sub-pixels of each color are different under different display brightness levels. At this time, the number of monochrome currents corresponding to the same color sub-pixels in each display area 101 is the same as the number of preset display brightness levels. With continued reference to fig. 2, the display panel further includes a driving unit 102. When acquiring the monochrome current at the preset display luminance level of the sub-pixels of different colors in each display area 101, it can be directly acquired by the driving unit 102. When acquiring the monochromatic current of the sub-pixels with different colors in each display area 101 under at least one preset display brightness level, the time consumption is short, no extra mura information acquisition equipment is needed, and the cost of display panel brightness compensation is reduced. And the monochrome current can be obtained when the gray scale is low, and the monochrome display brightness under the low gray scale can be determined according to the monochrome current of the low gray scale in the subsequent step, so that the mura information of the display panel with the low gray scale can be obtained, the influence of PWM dimming on the mura information is avoided, and the compensation effect of mura phenomena of the low gray scale and the PWM dimming area can be improved in the subsequent step. Meanwhile, the monochromatic current can be continuously obtained, so that the mura phenomenon of the display panel can be compensated in real time.
S120, determining the monochrome display brightness of each display area according to the monochrome current;
After determining the monochrome current in each display area, the monochrome display brightness in each display area can be determined according to the monochrome current of the same color sub-pixel in each display area. Illustratively, with continued reference to fig. 2, when the display area 101 includes a plurality of red sub-pixels, a plurality of green sub-pixels, and a plurality of blue sub-pixels, the monochrome display luminance of the red sub-pixels in each display area 101 may be determined according to the monochrome current corresponding to the red sub-pixels in each display area 101, the monochrome display luminance of the green sub-pixels in each display area 101 may be determined according to the monochrome current corresponding to the green sub-pixels in each display area 101, and the monochrome display luminance of the blue sub-pixels in each display area 101 may be determined according to the monochrome current corresponding to the blue sub-pixels in each display area 101, i.e., each display area 101 includes three monochrome display luminances. When the display panel includes 3*5 =15 display areas 101, there are 15×3=45 monochrome display luminances. The monochrome display brightness corresponding to the sub-pixels with different colors in each display area 101 is determined by the monochrome current corresponding to the same preset display brightness level.
It should be noted that, when the monochrome currents corresponding to the sub-pixels of the same color in the display area 101 correspond to at least two different preset display brightness levels, the monochrome display brightness of each display area 101 in different preset display brightness levels may be determined according to the monochrome currents corresponding to the different preset display brightness levels.
S130, compensating the brightness of the display panel according to the monochrome display brightness and the monochrome target display brightness.
After determining the monochrome display brightness of the sub-pixels with different colors in each display area, the brightness of the sub-pixels with different colors in each display area can be compensated according to the difference value between the monochrome display brightness and the target display brightness, so that the brightness compensation of the display panel is realized. For example, with continued reference to fig. 2, when the display panel includes 3*5 display regions 101, one of the display regions 101 may be set as a target display region, e.g., the target display region is a center region in the display panel. Then, the monochrome display luminance of the target display area is set as the monochrome target display luminance. At this time, the brightness of the sub-pixels with different colors in the other 14 display areas 101 can be compensated according to the difference between the monochrome display brightness of the other 14 display areas 101 and the monochrome target display brightness, so as to realize brightness compensation of the display panel. When each display area 101 includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, the luminance of the red sub-pixel in each display area 101 may be compensated according to the difference between the monochrome display luminance of the red sub-pixel in the other 14 display areas 101 and the monochrome target display luminance of the red sub-pixel in the target display area, the luminance of the green sub-pixel in each display area 101 may be compensated according to the difference between the monochrome display luminance of the green sub-pixel in the other 14 display areas 101 and the monochrome target display luminance of the green sub-pixel in the target display area, and the luminance of the blue sub-pixel in each display area 101 may be compensated according to the difference between the monochrome display luminance of the blue sub-pixel in the other 14 display areas 101 and the monochrome target display luminance of the blue sub-pixel in the target display area. So that brightness compensation of the entire display panel can be achieved. In addition, the brightness of the display panel is compensated by the monochrome display brightness and the monochrome target display brightness, so that the monochrome compensation of the subpixels in the display panel can be realized, and the precision of the brightness compensation of the display panel can be improved.
According to the technical scheme, the time for acquiring mura information can be shortened, the equipment for acquiring the mura information is not required to be additionally arranged, the cost for compensating the brightness of the display panel is reduced, and meanwhile, the influence of PWM dimming on the mura information is avoided. And the monochromatic current can be obtained at the low gray level, so that the mura information of the low gray level of the display panel can be obtained, and the compensating effect of the mura phenomenon of the low gray level and the PWM dimming area can be improved in the subsequent steps. Meanwhile, the monochromatic current can be continuously obtained, so that the mura phenomenon of the display panel can be compensated in real time. And the accuracy of the display panel brightness compensation is improved.
On the basis of the technical scheme, determining the monochrome display brightness of each display area according to the monochrome current comprises the following steps:
the monochrome display luminance of each display area is calculated from the monochrome current and the dot current efficiency of the sub-pixel of the corresponding color.
After determining the monochromatic current of the sub-pixels with different colors in each display area under a preset display brightness level, the product of the monochromatic current and the point current efficiency of the sub-pixels with corresponding colors under the preset display brightness level is the monochromatic display brightness of the corresponding condition. Illustratively, referring to fig. 2, the display panel includes 3*5 =15 display regions 101, each display region 101 including red, green, and blue sub-pixels therein. After determining a preset display brightness level, the monochromatic currents of the three color sub-pixels corresponding to each display area 101 can be obtained respectively, that is, a total of 15×3=45 monochromatic currents. At this time, the dot current efficiencies of the three colors in each display area 101 may be determined, and then the monochrome display luminance of the red subpixel in each display area 101 may be determined according to the product of the monochrome current of the red subpixel and the dot current efficiency of the red subpixel in each display area 101. Similarly, the monochrome display luminance of the green sub-pixel in each display area 101 may be determined from the product of the monochrome current of the green sub-pixel and the dot current efficiency of the green sub-pixel in each display area 101. The monochrome display luminance of the blue sub-pixel in each display area 101 may be determined from the product of the monochrome current of the blue sub-pixel and the dot current efficiency of the blue sub-pixel in each display area 101.
Note that the dot current efficiency of the same color sub-pixels is substantially the same in the same display panel and in different display regions 101. The same dot current efficiency may be employed in calculating the monochrome display luminance of the same color sub-pixel in the different display areas 101. Illustratively, referring to fig. 2, in 3*5 =15 display regions 101, the dot current efficiencies of the red sub-pixels, the green sub-pixels, and the blue sub-pixels are equal in each display region 101.
On the basis of the technical schemes, the monochromatic current comprises monochromatic currents corresponding to different gray scales; determining the monochrome display luminance of each display area according to the monochrome current, comprising:
And determining the monochrome display brightness in different gray scales in each display area according to the monochrome current in different gray scales.
The display panel can comprise a plurality of gray scales for realizing the display of different brightness of the display panel. Illustratively, the display panel may include 0-255 gray scales. The 0 gray scale may correspond to the brightest luminance displayed by the display panel, and the 255 gray scale may correspond to the darkest luminance displayed by the display panel. When the monochromatic current of the sub-pixels with different colors in each display area under the preset display brightness level is obtained, the monochromatic current corresponding to different gray scales under the preset display brightness level can be obtained, so that the monochromatic display brightness of the sub-pixels with different colors in each display area under different gray scales can be determined according to the monochromatic current under different gray scales, and mura information under the display brightness level can be determined according to the monochromatic display brightness under different gray scales in the subsequent steps. In an exemplary embodiment, when obtaining the monochrome currents of the subpixels of different colors in each display area under the preset display brightness level, the monochrome currents corresponding to the low gray scale, the middle gray scale and the high gray scale may be obtained respectively, then the monochrome display brightness corresponding to the low gray scale, the middle gray scale and the high gray scale is determined according to the monochrome currents corresponding to the low gray scale, the middle gray scale and the high gray scale, and then the monochrome display brightness corresponding to all the gray scales is fitted according to the monochrome display brightness corresponding to the low gray scale, the middle gray scale and the high gray scale. Or the monochromatic current corresponding to all gray scales can be directly obtained, and then the monochromatic display brightness corresponding to all gray scales can be determined according to the monochromatic current corresponding to all gray scales.
On the basis of the above technical solution, fig. 4 is a flowchart of another brightness compensation method for a display panel according to an embodiment of the present invention, as shown in fig. 4, where the method includes:
S210, acquiring monochromatic currents of sub-pixels with different colors in each display area under at least one preset display brightness level;
S220, determining the monochrome display brightness under different gray scales in each display area according to the monochrome current under different gray scales.
S230, determining monochromatic brightness compensation values of sub-pixels with different colors in each display area according to the monochromatic display brightness and the monochromatic target display brightness;
The target display brightness of the single color of the sub-pixels with different colors in each display area can be set according to the requirement under a preset display brightness level. For example, the monochrome display luminance of the subpixels of different colors in a display area in the display panel may be selected as the monochrome target display luminance, with the display area being the target display area. Alternatively, the target display area may be a central area of the display panel. After determining the single-color target display brightness under a preset display brightness level, determining single-color brightness compensation values of the sub-pixels with different colors in each display area according to the difference value between the single-color display brightness and the corresponding single-color target display brightness, namely the brightness values of the sub-pixels with different colors in each display area to be compensated.
S240, determining gamma curves of sub-pixels with different colors in each display area according to the single-color display brightness under different gray scales;
The gamma curve is used for representing the corresponding relation between different gray scales and display brightness. Under a preset display brightness level, gamma curves of sub-pixels with different colors in each display area can be determined through different gray scales and corresponding single-color display brightness. At this time, the number of gamma curves of the sub-pixels with different colors in each display area is the same as the number of colors of the sub-pixels. Therefore, the single-color display brightness of the single-color sub-pixels can be correspondingly adjusted according to the gamma curve of the single-color sub-pixels, the display brightness of the display panel is adjusted, the display uniformity is improved, the color shift of the display panel can be adjusted, and the display effect of the display panel is further improved.
Optionally, determining the gamma curves of the subpixels of different colors in each display area according to the monochrome display brightness at different gray scales includes:
fitting gamma curves of sub-pixels with different colors in each display area according to the single-color display brightness under different gray scales.
The single-color display luminance at different gray scales may include single-color display luminance at least two gray scales, and illustratively, single-color display luminance at different gray scales may include single-color display luminance at a part of low gray scales, medium gray scales, and high gray scales. After the monochrome display brightness under the partial gray scale is determined, the monochrome display brightness corresponding to all gray scales can be fitted according to the partial gray scale and the monochrome display brightness corresponding to the partial gray scale, so that gamma curves of sub-pixels with different colors in each display area are determined.
It should be noted that, when the gamma curves of the sub-pixels of different colors in each display area are fitted according to the monochrome display brightness under different gray scales, the gray scale number for obtaining the monochrome display brightness may be determined according to the accuracy of the gamma curves, which is not limited herein.
S250, determining compensation gray scales of sub-pixels with different colors in each display area according to the single-color brightness compensation value and the gamma curve;
after the monochrome brightness compensation value and the gamma curve are determined, the compensation gray scale corresponding to the monochrome brightness compensation value can be determined according to the gamma curve of the sub-pixels with different colors in each display area, so that the driving voltage required to be compensated can be determined according to the compensation gray scale corresponding to each gray scale, or the display gray scale after each gray scale compensation can be determined.
S260, compensating the brightness of the sub-pixels with different colors in each display area according to the compensation gray scale.
After determining the compensation gray scales of the sub-pixels with different colors in each display area, the sub-pixels with different colors in each display area can be driven according to the driving voltages corresponding to the display gray scales after the compensation of each gray scale. Or the current driving voltage can be compensated according to the driving voltage which is required to be compensated and corresponds to the compensation gray scale, so that the brightness compensation of the sub-pixels with different colors in each display area can be realized, the mura phenomenon of the display panel is improved, and the display uniformity of the display panel is improved.
On the basis of the technical schemes, when the display brightness level of the display panel comprises the display brightness level of the first dimming area and the display brightness level of the second dimming area; obtaining the monochromatic current of the sub-pixels with different colors in each display area under at least one preset display brightness level comprises the following steps:
and acquiring the monochromatic current of the subpixels with different colors in each display area under the display brightness level of at least one first dimming area and the monochromatic current of the subpixels under the display brightness level of at least one second dimming area.
When the display brightness levels are different, different dimming modes can be adopted. For example, the dimming manner at the first dimming region display brightness level may be DC dimming. Namely, the data voltage is adjusted to adjust the light-emitting brightness of the pixel driving circuit driving light-emitting devices, so as to control the brightness of the display panel. The dimming mode of the second dimming region at the display brightness level may be PWM dimming. Namely, the light-emitting control signal is a PWM signal, and the duty ratio of the PWM signal is controlled to control the light-emitting time of the light-emitting device, so as to control the brightness of the display panel. When the display brightness level is lower, the light can be adjusted by adopting a PWM light adjusting mode, and the display brightness level corresponding to the PWM light adjusting mode is smaller, namely the display brightness level of the second light adjusting area is a low display brightness level. When the display brightness level is higher, the dimming can be performed by adopting a DC dimming mode, and at this time, the display brightness level corresponding to the DC dimming mode is larger, that is, the display brightness level of the first dimming area is a high display brightness level. Different dimming modes have different effects on the mura phenomenon of the display panel. When the display brightness level includes the first dimming area display brightness level and the second dimming area display brightness level, the monochrome current of the sub-pixels with different colors in each display area under the display brightness level of at least one first dimming area and the monochrome current of the sub-pixels with different colors in each display area under the display brightness level of at least one second dimming area can be respectively obtained. Therefore, the single-color display brightness of the at least one first dimming area under the display brightness level can be determined according to the single-color current of the at least one first dimming area under the display brightness level, namely mura information of the at least one first dimming area under the display brightness level is obtained. And determining the single-color display brightness of the at least one second dimming area under the display brightness level according to the single-color current of the at least one second dimming area under the display brightness level, namely acquiring mura information of the at least one second dimming area under the display brightness level. Therefore, the mura information difference caused by the difference of the DC dimming mode and the PWM dimming mode in the mura information acquisition process can be avoided. Meanwhile, the mura phenomenon of the second dimming area under the display brightness level and the first dimming area under the display brightness level can be improved simultaneously in the subsequent process, and the display uniformity of the display panel is improved.
On the basis of the technical scheme, determining the monochrome display brightness of each display area according to the monochrome current comprises the following steps:
the single-color display brightness of each display area in the first dimming area is determined according to the single-color current of the first dimming area in the display brightness level, and the single-color display brightness of each display area in the second dimming area is determined according to the single-color current of the second dimming area in the display brightness level.
When the single-color current includes the single-color current at the display brightness level of the first dimming area and the single-color current at the display brightness level of the second dimming area, the single-color display brightness at the display brightness level of the first dimming area and the single-color display brightness at the display brightness level of the second dimming area can be calculated respectively, namely the single-color display brightness of the first dimming area and the single-color display brightness of the second dimming area. For example, the single-color light-emitting brightness of the sub-pixels with different colors in each display area under the display brightness level of the first dimming area can be calculated according to the single-color current under the display brightness level of the first dimming area and the point current efficiency of the sub-pixels with different colors in each display area, namely the single-color display brightness of the first dimming area. Similarly, the single-color luminous brightness of the sub-pixels with different colors in each display area under the display brightness level of the second dimming area can be calculated according to the single-color current under the display brightness level of the second dimming area and the point current efficiency of the sub-pixels with different colors in each display area, namely the single-color display brightness of the second dimming area.
On the basis of the technical scheme, the brightness compensation display panel according to the monochrome display brightness and the monochrome target display brightness comprises the following steps:
the brightness of the display panel is compensated according to the monochrome display brightness of the first dimming area and the first monochrome target display brightness, and the brightness of the display panel is compensated according to the monochrome display brightness of the second dimming area and the second monochrome target display brightness.
The first single-color target display brightness is the single-color target display brightness corresponding to the display brightness level of the first dimming area. After determining the monochrome display luminance of the first dimming region, the luminance of the display panel may be compensated according to a difference between the monochrome display luminance of the first dimming region and the first monochrome target display luminance. Thereby, the brightness compensation of the display panel under the display brightness level of the first dimming area can be realized. For example, at the first dimming region display brightness level, the brightness of one of the display regions may be set as the target display region, for example, the target display region is a center region in the display panel. Then, the monochrome display luminance of the target display area is set as the first monochrome target display luminance. At this time, the brightness of the sub-pixels with different colors in the other display areas can be compensated according to the difference value between the monochrome display brightness of the other display areas and the first monochrome target display brightness, so as to realize the brightness compensation of the display panel.
Similarly, the second monochrome target display luminance is the monochrome target display luminance corresponding to the second dimming area display luminance level. After determining the monochrome display luminance of the second dimming region, the luminance of the display panel may be compensated according to a difference between the monochrome display luminance of the second dimming region and the second monochrome target display luminance. Thereby, the brightness compensation of the display panel under the display brightness level of the second dimming area can be realized. For example, at the second dimming region display brightness level, the brightness of one of the display regions may be set as the target display region, for example, the target display region is a center region in the display panel. Then, the monochrome display luminance of the target display area is set as the second monochrome target display luminance. At this time, the brightness of the sub-pixels with different colors in the other display areas can be compensated according to the difference value between the monochrome display brightness of the other display areas and the second monochrome target display brightness, so as to realize the brightness compensation of the display panel.
When the display panel comprises a plurality of gray scales, the monochromatic display brightness of the first dimming area and the monochromatic display brightness of the second dimming area comprise display brightness corresponding to at least two gray scales. When the display panel performs brightness compensation under the display brightness level of the first dimming area, gamma curves of sub-pixels with different colors in each display area under the display brightness level of the first dimming area can be determined according to at least two gray scales and the single-color display brightness of the first dimming area corresponding to the at least two gray scales. And then determining the compensation gray scale of the sub-pixels with different colors in each display area according to the single-color brightness compensation value and the gamma curve under the display brightness level of the first dimming area, and compensating the brightness of the sub-pixels with different colors in each display area according to the compensation gray scale and the corresponding driving voltage so as to realize the brightness compensation of the display panel under the display brightness level of the first dimming area.
Similarly, when the display panel performs brightness compensation under the display brightness level of the second dimming area, the gamma curve of the sub-pixels with different colors in each display area under the display brightness level of the second dimming area can be determined according to at least two gray scales and the single-color display brightness of the second dimming area corresponding to the at least two gray scales. And then determining the compensation gray scale of the sub-pixels with different colors in each display area according to the single-color brightness compensation value and the gamma curve under the display brightness level of the second dimming area, and compensating the brightness of the sub-pixels with different colors in each display area according to the compensation gray scale and the corresponding driving voltage so as to realize the brightness compensation of the display panel under the display brightness level of the second dimming area.
On the basis of the above technical solutions, when the display brightness levels of the first dimming area include a plurality of display brightness levels, under different display brightness levels of the first dimming area, when the monochrome display brightness of the same color sub-pixels corresponding to different gray scales is the same, compensating the brightness of the display panel under the condition corresponding to the same monochrome display brightness according to the monochrome display brightness of the current first dimming area and the first monochrome target display brightness;
Specifically, when the display brightness levels of the first dimming areas include a plurality of obtained monochromatic currents corresponding to one of the display brightness levels of the first dimming areas, the compensated driving voltages corresponding to the display brightness levels of the other first dimming areas can be determined according to the principle that the brightness is the same and the compensation values are the same and according to the compensated driving voltages corresponding to the display brightness levels of the first dimming areas, so that brightness compensation under all the display brightness levels of the first dimming areas can be achieved. For example, when the monochrome display luminance determined according to the monochrome current of the first preset gray scale at the current first dimming area display luminance level is the same as the monochrome display luminance corresponding to the next gray scale of the display luminance level of the other first dimming area, the monochrome display luminance of the gray scale at the display luminance level of the other first dimming area may determine the driving voltage compensation value according to the monochrome display luminance of the first preset gray scale and the first monochrome target display luminance at the current first dimming area display luminance level, and perform luminance compensation of the display panel. For example, when the current display brightness level of the first dimming area is 100 nits and the first preset gray level is 255 gray levels, and at this time, the current monochrome display brightness is the same as the display brightness level of the first dimming area and the monochrome display brightness of the gray level is 100 gray levels, the driving voltage compensation value can be directly determined according to the current monochrome display brightness and the first target display brightness, so that the display panel with the display brightness level of the first dimming area is 200 nits and the gray level is 100 gray levels is subjected to brightness compensation.
On the basis of the above technical solutions, when the display brightness levels of the second dimming area include a plurality of display brightness levels, under different display brightness levels of the second dimming area, when the monochrome display brightness of the same color sub-pixels corresponding to different gray scales is the same, the brightness of the display panel under the condition corresponding to the same monochrome display brightness is compensated according to the monochrome display brightness of the current second dimming area and the second monochrome target display brightness.
Similarly, when the display brightness levels of the second dimming areas include a plurality of display brightness levels, the compensated driving voltages corresponding to the display brightness levels of other second dimming areas can be determined according to the driving voltage compensation values corresponding to the display brightness levels of the second dimming areas according to the principle that the brightness is the same and the compensation values are the same, so that brightness compensation under all the display brightness levels of the second dimming areas can be realized. In addition, when the dimming mode corresponding to the display brightness level of the second dimming area is the PWM dimming mode, the black insertion time of the PWM signal has a relatively large influence on mura information of the display panel in the low brightness condition in the PWM dimming mode. When the display brightness levels of the PWM dimming areas comprise a plurality of single-color currents corresponding to the display brightness levels of one PWM dimming area, the single-color currents under the display brightness levels of different PWM dimming areas can be sequentially obtained, and the single-color display brightness under the display brightness levels of different PWM dimming areas can be respectively determined according to the single-color currents under the display brightness levels of different PWM dimming areas, so that the brightness of the display panel under the display brightness levels of different PWM dimming areas can be compensated according to the single-color display brightness under the display brightness levels of different PWM dimming areas and the corresponding single-color target display brightness, and the brightness compensation of the display panel under the display brightness levels of different PWM dimming areas can be realized. Illustratively, different PWM dimming regions display brightness levels corresponding to different PWM black insertion values. When obtaining the monochromatic current under the display brightness level of different PWM dimming areas, the monochromatic current under the display brightness level of the PWM dimming areas with the PWM black insertion values of 40%, 60%, 80%, 90% and the like can be obtained.
The embodiment of the invention also provides a brightness compensation device of the display panel. The display panel comprises a plurality of display areas, and the power supply voltage of the sub-pixels with different colors in each display area is independently controlled. Fig. 5 is a schematic structural diagram of a brightness compensation device of a display panel according to an embodiment of the invention. As shown in fig. 5, the brightness compensation device of the display panel includes:
An acquisition module 10, configured to acquire monochromatic currents of sub-pixels of different colors in each display area under at least one preset display brightness level;
a determining module 20 for determining a monochrome display luminance of each display area according to the monochrome current;
and a compensation module 30 for compensating the brightness of the display panel according to the monochrome display brightness and the monochrome target display brightness.
According to the technical scheme, the acquisition module acquires the monochromatic current of the subpixels of different colors in each display area under at least one preset display brightness level, and the determination module determines the monochromatic display brightness of each display area according to the monochromatic current, so that the time for acquiring mura information can be shortened, the equipment for acquiring the mura information is not required to be additionally arranged, the brightness compensation cost of the display panel is reduced, and meanwhile, the influence of PWM dimming on the mura information is avoided. And the monochromatic current can be obtained at the low gray level, so that the mura information of the low gray level of the display panel can be obtained, and the compensating effect of the mura phenomenon of the low gray level and the second dimming area can be improved in the subsequent steps. Meanwhile, the monochromatic current can be continuously obtained, so that the mura phenomenon of the display panel can be compensated in real time. And the accuracy of the display panel brightness compensation is improved.
On the basis of the technical scheme, when the display brightness level of the display panel comprises the display brightness level of the first dimming area and the display brightness level of the second dimming area; the acquisition module is specifically configured to acquire monochromatic currents of different color sub-pixels in each display area under the display brightness level of at least one first dimming area, and monochromatic currents of different color sub-pixels in each display area under the display brightness level of at least one second dimming area.
On the basis of the technical scheme, the determining module is specifically configured to determine the monochrome display brightness of each display area in the first dimming area according to the monochrome current at the display brightness level of the first dimming area, and determine the monochrome display brightness of each display area in the second dimming area according to the monochrome current at the display brightness level of the second dimming area.
On the basis of the technical scheme, the compensation module is specifically used for compensating the brightness of the display panel according to the single-color display brightness of the first dimming area and the first single-color target display brightness, and compensating the brightness of the display panel according to the single-color display brightness of the second dimming area and the second single-color target display brightness.
On the basis of the technical schemes, the determining module is used for calculating the monochrome display brightness of each display area according to the monochrome current and the dot current efficiency of the sub-pixels with the corresponding colors.
On the basis of the technical schemes, when the display panel comprises different gray scales and the monochromatic current comprises monochromatic currents corresponding to the different gray scales; the determining module is used for determining the monochrome display brightness under different gray scales in each display area according to the monochrome current under different gray scales.
On the basis of the technical schemes, the compensation module comprises:
a first determining unit for determining a monochrome luminance compensation value of the sub-pixels of different colors in each display area according to the monochrome display luminance and the monochrome target display luminance;
the second determining unit is used for determining gamma curves of sub-pixels with different colors in each display area according to the single-color display brightness under different gray scales;
The third determining unit is used for determining the compensation gray scale of the sub-pixels with different colors in each display area according to the single-color brightness compensation value and the gamma curve;
and the compensation unit is used for compensating the brightness of the sub-pixels with different colors in each display area according to the compensation gray scale.
Optionally, the second determining unit is specifically configured to fit gamma curves of sub-pixels with different colors in each display area according to the monochrome display brightness under different gray scales.
The embodiment of the invention also provides a display device. Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 6, the display device 100 includes a brightness compensation device 200 of a display panel according to any embodiment of the present invention.
Specifically, the display device further includes a display panel 300, and the brightness compensation device 200 of the display panel is connected to the display panel 300, and is configured to obtain a monochrome current of sub-pixels of different colors in each display area on the display panel 300, then determine a monochrome display brightness of each display area according to the monochrome current, and compensate the brightness of the display panel 300 according to the monochrome display brightness and the monochrome target display brightness. The brightness compensation device 200 of the display panel may be a brightness compensation device of a display panel according to any embodiment of the present invention. When the display device 100 includes the brightness compensation device 200 of the display panel according to any embodiment of the present invention, the same advantages as those of the brightness compensation device 200 of the display panel according to any embodiment of the present invention are provided, and the description thereof is omitted. The display device 100 may be any product or component with display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, etc.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (10)

1. A brightness compensation method of a display panel, wherein the display panel includes a plurality of display regions, and power supply voltages of subpixels of different colors in each of the display regions are independently controlled, the brightness compensation method of the display panel comprising:
Acquiring monochromatic currents of sub-pixels with different colors in each display area under at least one preset display brightness level;
Determining the monochrome display brightness of each display area according to the monochrome current;
And compensating the brightness of the display panel according to the single-color display brightness and the single-color target display brightness.
2. The method of claim 1, wherein the display brightness level of the display panel comprises a first dimming region display brightness level and a second dimming region display brightness level; obtaining the monochromatic current of the sub-pixels with different colors in each display area under at least one preset display brightness level comprises the following steps:
And acquiring the monochromatic current of the subpixels with different colors in each display area under the display brightness level of at least one first dimming area and the monochromatic current under the display brightness level of at least one second dimming area.
3. The method of claim 2, wherein determining the monochrome display luminance of each of the display areas from the monochrome current comprises:
And determining the single-color display brightness of each display area in the first dimming area according to the single-color current of the display brightness level of the first dimming area, and determining the single-color display brightness of each display area in the second dimming area according to the single-color current of the display brightness level of the second dimming area.
4. A brightness compensation method of a display panel according to claim 3, wherein compensating the brightness of the display panel according to the monochrome display brightness and monochrome target display brightness comprises:
Compensating the brightness of the display panel according to the single-color display brightness of the first dimming area and the first single-color target display brightness, and compensating the brightness of the display panel according to the single-color display brightness of the second dimming area and the second single-color target display brightness;
Preferably, when the display brightness level of the first dimming area includes a plurality of display brightness levels, when the monochrome display brightness of the same color sub-pixels corresponding to different gray scales is the same under different display brightness levels of the first dimming area, compensating the brightness of the display panel under the condition corresponding to the same monochrome display brightness according to the current monochrome display brightness of the first dimming area and the first monochrome target display brightness;
Preferably, when the display brightness level of the second dimming area includes a plurality of display brightness levels, when the monochrome display brightness of the same color sub-pixels corresponding to different gray scales is the same under different display brightness levels of the second dimming area, the brightness of the display panel under the condition corresponding to the same monochrome display brightness is compensated according to the current monochrome display brightness of the second dimming area and the second monochrome target display brightness.
5. The method according to any one of claims 1 to 4, wherein the monochrome current includes monochrome currents corresponding to different gray scales; determining the monochrome display brightness of each display area according to the monochrome current, comprising:
and determining the monochrome display brightness in different gray scales in each display area according to the monochrome current in different gray scales.
6. The method of compensating for brightness of a display panel according to claim 5, wherein compensating for the brightness of the display panel according to the monochrome display brightness and the monochrome target display brightness comprises:
Determining a monochromatic brightness compensation value of sub-pixels with different colors in each display area according to the monochromatic display brightness and the monochromatic target display brightness;
determining gamma curves of sub-pixels with different colors in each display area according to the single-color display brightness under different gray scales;
Determining compensation gray scales of sub-pixels with different colors in each display area according to the single-color brightness compensation value and the gamma curve;
and compensating the brightness of the sub-pixels with different colors in each display area according to the compensation gray scale.
7. The method of claim 6, wherein determining gamma curves for different color sub-pixels in each of the display areas according to the single color display brightness at different gray scales comprises:
Fitting gamma curves of sub-pixels with different colors in each display area according to the single-color display brightness under different gray scales.
8. The method of claim 1, wherein determining the monochrome display luminance of each of the display areas from the monochrome current comprises:
And calculating the monochrome display brightness of each display area according to the monochrome current and the dot current efficiency of the sub-pixels of the corresponding color.
9. A brightness compensation device of a display panel, wherein the display panel includes a plurality of display areas, and power supply voltages of subpixels of different colors in each of the display areas are independently controlled, the brightness compensation device of the display panel comprising:
The acquisition module is used for acquiring monochromatic currents of the sub-pixels with different colors in each display area under at least one preset display brightness level;
a determining module, configured to determine a monochrome display luminance of each display area according to the monochrome current;
And the compensation module is used for compensating the brightness of the display panel according to the monochrome display brightness and the monochrome target display brightness.
10. A display device comprising the luminance compensation device of the display panel according to claim 9.
CN202311207037.7A 2023-09-18 2023-09-18 Brightness compensation method and device for display panel and display device Pending CN118658417A (en)

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Application Number Priority Date Filing Date Title
CN202311207037.7A CN118658417A (en) 2023-09-18 2023-09-18 Brightness compensation method and device for display panel and display device

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