CN114898706B - Display screen brightness compensation method and device and computer equipment - Google Patents
Display screen brightness compensation method and device and computer equipment Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The application provides a brightness compensation method and device for a display screen and computer equipment, and solves the problem of uneven brightness of the display screen in the prior art. The brightness compensation method comprises the following steps: determining that the display screen meets brightness compensation conditions; respectively acquiring actual brightness values of all pixel points when a display screen displays a plurality of white pictures with different gray scales, wherein the display screen comprises a plurality of display areas, and the plurality of display areas comprise target display areas; determining brightness compensation values of a plurality of display areas under a plurality of different gray scales respectively, wherein the brightness compensation value of each display area depends on the actual brightness value of each pixel point in the display area, the actual brightness value of each pixel point in a target display area and a pre-stored target brightness value of a display screen; determining, for each display area, brightness compensation values of the display area at the remaining gray levels based on brightness compensation values of the display area at a plurality of different gray levels; and controlling the display screen to display according to the brightness compensated by the brightness compensation value.
Description
Technical Field
The application relates to the technical field of display, in particular to a brightness compensation method and device for a display screen and computer equipment.
Background
Organic light emitting diode (Organic Light Emitting Display, OLED) display screens have become one of the mainstream products of present display devices by virtue of their advantages of no need for backlight, high contrast, thin thickness, wide viewing angle, rapid response, wide use temperature range, etc. However, when the OLED display screen leaves the factory, a phenomenon of uneven brightness often occurs, which affects the display effect.
Disclosure of Invention
In view of the above, the embodiments of the present application provide a method and apparatus for compensating brightness of a display screen, and a computer device, so as to solve the problem of uneven brightness of the display screen in the prior art.
The first aspect of the present application provides a brightness compensation method for a display screen, including: determining that the display screen meets brightness compensation conditions; respectively acquiring actual brightness values of all pixel points when a display screen displays a plurality of white pictures with different gray scales, wherein the display screen comprises a plurality of display areas, and the plurality of display areas comprise target display areas; determining brightness compensation values of a plurality of display areas under a plurality of different gray scales respectively, wherein the brightness compensation value of each display area depends on the actual brightness value of each pixel point in the display area, the actual brightness value of each pixel point in a target display area and a pre-stored target brightness value of a display screen; determining, for each display area, brightness compensation values of the display area at the remaining gray levels based on brightness compensation values of the display area at a plurality of different gray levels; and controlling the display screen to display according to the brightness compensated by the brightness compensation value. The brightness compensation method is suitable for the factory testing process of the display screen, and can improve the brightness uniformity of the display screen.
In one embodiment, respectively obtaining the actual brightness value of each pixel point when the display screen displays a plurality of white images with different gray scales includes: controlling the display screen to sequentially display a plurality of white pictures with different gray scales; the photoelectric sensor is used for respectively collecting the actual brightness values of all pixel points in the white pictures with different gray scales.
In one embodiment, determining the brightness compensation value for each of the plurality of display regions at a plurality of different gray levels comprises: for each display area, determining an initial brightness compensation value based on the actual brightness value of each pixel point in the display area and a pre-stored target brightness value of a display screen; and optimizing the initial brightness compensation value by taking the actual brightness value of each pixel point in the target display area as a reference to obtain the brightness compensation value. The compensation possible points are not good when the initial brightness compensation value is directly utilized, and the optimized brightness compensation value has better compensation effect compared with the initial brightness compensation value.
In one embodiment, for each display region, determining an initial luminance compensation value based on the actual luminance value of each pixel in the display region and a pre-stored target luminance value of the display screen comprises: for each display area, determining an actual brightness value of the display area based on the actual brightness value of each pixel point in the display area; determining a target brightness value of the display area based on the target brightness value of the display screen; determining an absolute value of a difference between an actual luminance value of the display area and a target luminance value of the display area; the ratio of the absolute value to the number of pixel points in the display area is determined as an initial brightness compensation value.
In one embodiment, optimizing the initial luminance compensation value based on the actual luminance value of each pixel in the target display area, to obtain the luminance compensation value includes: for each display area, determining the ratio of the average value of the actual brightness values of all the pixel points in the display area to the average value of the actual brightness values of all the pixel points in the target display area; determining a brightness compensation value G i ＝(1-K i +1)*Y i Wherein i denotes the number of the display area, K i Express the ratio, Y i Representing the initial luminance compensation value.
In one embodiment, before determining the brightness compensation values of the plurality of display regions at the plurality of different gray scales, the method further comprises: determining the brightness change trend of the display screen based on any one of a plurality of white pictures with different gray scales; the display screen is divided into a plurality of display areas according to the trend of brightness variation. The display screen is divided into a plurality of display areas according to the brightness change trend of the display screen, so that the actual brightness average value of each display area used in the brightness compensation value calculation process can be ensured to be more reliable, and the compensation effect of the brightness compensation value is further improved.
In one embodiment, determining the trend of brightness change of the display screen based on any one of the plurality of white pictures of different gray scales includes: dividing any white picture into a plurality of areas in a plurality of preset directions respectively; determining the average value of the actual brightness values of all pixel points in each area; and determining the brightness change trend by the trend that the average value of the actual brightness values of the area linearly changes in the target direction, wherein the target direction is selected from a plurality of preset directions. The linear change trend is adopted as the brightness change trend to accord with the brightness change rule of the display screen.
In one embodiment, the luminance variation trend is a linear variation trend in the target direction; dividing the display screen into a plurality of display areas according to the trend of brightness variation includes: dividing a display screen into odd display areas in a target direction; the brightness compensation method further comprises the following steps: the centrally located display area is determined as the target display area. The central display area is used as a target display area, namely, the middle brightness area on the brightness change rule is used as a reference, so that the brightness compensation values of the high brightness area and the low brightness area are not too large, and the memory requirement is low.
The second aspect of the present application provides a brightness compensation device for a display screen, comprising: the first determining module is used for determining that the display screen meets brightness compensation conditions; the display screen comprises a plurality of display areas, and the display areas comprise target display areas; the second determining module is used for determining brightness compensation values of a plurality of display areas under a plurality of different gray scales respectively, wherein the brightness compensation value of each display area depends on the actual brightness value of each pixel point in the display area, the actual brightness value of each pixel point in the target display area and the pre-stored target brightness value of the display screen; a third determining module, configured to determine, for each display area, a brightness compensation value of the display area under the remaining gray scales based on brightness compensation values of the display area under a plurality of different gray scales; and the control module is used for controlling the display screen to display according to the brightness compensated by the brightness compensation value.
A third aspect of the present application provides a computer device comprising a memory, a processor and a computer program stored on the memory for execution by the processor, the processor executing the computer program to perform the steps of the method for brightness compensation of a display screen provided by any of the embodiments described above.
The brightness compensation method and device for the display screen and the computer equipment are suitable for the factory testing process of the display screen. The display screen includes a plurality of display areas including a target display area. When the display screen is determined to meet the brightness compensation condition, acquiring actual brightness values of all pixel points when the display screen displays a plurality of white pictures with different gray scales. For the white picture of each gray level, determining a brightness compensation value of the display area under the current gray level based on the actual brightness value of each pixel point in each display area, the actual brightness value of each pixel point in the target display area and the pre-stored target brightness value of the display screen, thereby obtaining the brightness compensation values of each display area under a plurality of different gray levels. The brightness compensation values at the remaining gray levels can be determined based on the brightness compensation values at a plurality of different gray levels for each display region. In the calculation process of the brightness compensation value, the initial compensation brightness value can be determined by the actual brightness value of each pixel point in the display area and the pre-stored target brightness value of the display screen, and the actual brightness value of each pixel point in the target display area is used for optimizing the initial compensation brightness value. And performing brightness compensation by using the brightness compensation value obtained after optimization, so as to ensure uniform brightness of the display screen.
Drawings
Fig. 1 is a flowchart of a brightness compensation method for a display screen according to an embodiment of the application.
Fig. 2 is a schematic structural diagram of a display screen according to an embodiment of the application.
Fig. 3 is a flowchart of a brightness compensation method of a display screen according to another embodiment of the application.
Fig. 4 is a schematic view of the display screen shown in fig. 3 divided in a horizontal direction and a vertical direction, respectively.
Fig. 5 is a block diagram of a brightness compensation device according to an embodiment of the application.
Fig. 6 is a block diagram of a brightness compensation device according to another embodiment of the application.
Detailed Description
As mentioned in the background art, the OLED display screen often has a phenomenon of uneven brightness when shipped, and the reasons for this phenomenon at least include the following:
1. the luminous mode of the OLED display screen is a current driving mode, and the driving current is influenced by wiring impedance in the transmission process, so that certain difference exists between the theoretical driving current and the actual current finally output to the OLED element, and the longer the wiring is, the larger the difference is, and the uniformity of the brightness of the display module is further influenced.
2. The OLED display screen is required to be subjected to multiple process steps before leaving the factory, and the luminance of the OLED element is attenuated due to the change of the luminance over time, so that the luminance of the display screen is uneven.
3. OLED elements are usually mass-produced, and process variations among different OLED elements are unavoidable in the production process, resulting in uneven brightness.
In view of the foregoing, the present application provides a brightness compensation method for a display screen, which may be applied to a testing process before shipping the display screen, for ensuring that the brightness of the display screen is uniform.
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a flowchart of a brightness compensation method for a display screen according to an embodiment of the application. As shown in fig. 1, the brightness compensation method 100 includes:
step S110, determining that the display screen meets brightness compensation conditions.
Step S120, the actual brightness value of each pixel point when the display screen displays a plurality of white pictures with different gray scales is obtained respectively. The display screen includes a plurality of display areas including a target display area.
In step S130, the brightness compensation values of the display areas at the different gray scales are determined, wherein the brightness compensation value of each display area depends on the actual brightness value of each pixel in the display area, the actual brightness value of each pixel in the target display area, and the pre-stored target brightness value of the display screen.
Step S140, for each display area, determining the brightness compensation value of the display area under the rest gray scales based on the brightness compensation values of the display area under the plurality of different gray scales.
And step S150, controlling the display screen to display according to the brightness compensated by the brightness compensation value.
The specific implementation of the brightness compensation method 100 will be described in detail below using a factory testing process of the display screen as an example.
In step S110, in a factory test process of the display screen, it is detected whether the display screen satisfies a brightness compensation condition. And when the display screen is determined to meet the brightness compensation condition, executing a brightness compensation process.
The brightness compensation condition may be that the current brightness is lower than a brightness threshold, and it is determined that the brightness compensation condition is satisfied. The display areas corresponding to the current brightness and brightness threshold are the same to ensure that the two are comparable.
For example, during a factory test, the brightness threshold may be a target brightness value of the entire display screen, i.e., a brightness value of the display screen that meets factory requirements. The current brightness can be obtained by detecting a photoelectric sensor arranged on one side of the non-display surface of the display screen, and the photoelectric sensor detects the current brightness of the whole display screen. The photosensor mentioned here is, for example, a charge coupled device (Charge coupled Device, CCD) image sensor.
For another example, the luminance threshold is a target luminance value of a predetermined area in the display screen, the predetermined area is a detection area of the CCD image sensor, and the CCD image sensor detects only the current luminance of the predetermined area for matching with the target luminance value to determine whether the luminance compensation condition is satisfied.
In step S120, when it is determined that the display screen meets the brightness compensation condition, the display screen may be controlled to sequentially display a plurality of white images with different gray scales, where the plurality of white images with different gray scales are a plurality of white images with preset gray scales; and then, respectively acquiring actual brightness values of all pixel points in each white picture by adopting a CCD image sensor.
In step S130, after the actual brightness values of the pixels in the white frames with different gray scales are obtained in step S120, the brightness compensation values of the pixels in the display areas with different gray scales can be determined based on the actual brightness values. In the brightness compensation method provided by the application, the brightness compensation values of all the pixel points in the same display area are the same, one display area corresponds to one brightness compensation value, and all the pixel points in the same display area are compensated by the brightness compensation value.
Fig. 2 is a schematic structural diagram of a display screen according to an embodiment of the application. As shown in fig. 2, the display screen includes a plurality of display areas S i Where i represents the i-th display area, i=1, 2,3. Multiple display regions S i Comprises a target display area selected from a plurality of display areas S i One of which is a metal alloy. Accordingly, each white screen can be divided into a plurality of display areas S i A plurality of sub-pictures corresponding one by one. For example, the CCD image sensor captures white images with 3 gray scales, namely 64 gray scales, 128 gray scales and 255 gray scales, and each display area S can be obtained according to the step S130 i And 3 corresponding brightness compensation values, wherein the 3 brightness compensation values respectively correspond to 64 gray scales, 128 gray scales and 255 gray scales.
Specifically, referring to fig. 2, step S130 may be performed as:
first, for each display area S i Based on the display area S i The actual brightness value of each pixel point in the display screen and the pre-stored target brightness value b of the display screen are used for determining an initial brightness compensation value Y i . The target brightness value b of the display screen is the brightness value of the whole display screen meeting the factory requirement.
Specifically, first, for each display area S i Based on the display area S i The actual brightness value of each pixel point in the display area S is determined i Actual luminance value a of (a) i 。
Display area S i Actual luminance value a of (a) i May be the display area S i The sum of the actual luminance values of all the pixels in the display area, or the product of the average value of the maximum actual luminance value and the minimum actual luminance value of the pixels in the display area and the number of pixels. It is understood that it can be reasonably set according to the actual situationCounting the display area S i Actual luminance value a of (a) i As long as the display area S can be approximately characterized i The actual brightness of the whole is only required.
Next, the display area S is determined based on the target brightness value of the display screen i Is set to the target luminance value of (1).
For example, the display area S i The target luminance value of (2) is the ratio of the target luminance value b of the display screen to the number of display areas.
Next, an absolute value of a difference between the actual luminance value of the display area and the target luminance value of the display area is determined.
Then, the absolute value and the display area S are determined i The ratio of the number of pixel points in the image is the initial brightness compensation value Y i 。
The initial luminance compensation value Y will be specifically described below by taking fig. 2 as an example i Is calculated by the computer. As shown in fig. 2, the display screen includes 3 display areas S i The 3 display areas S i A display area S arranged linearly and located at the center i For the target display area S 2 . Then 3 display areas S i Initial luminance compensation value Y of (2) i The method sequentially comprises the following steps:
Y 1 ＝|(a 1 -b/3)|/9＝|(4.200+4.286+4.332+4.244+4.327+4.373+4.300+4.386+4.421)-b/3|/9；
Y 2 ＝|(a 2 -b/3)|/9＝|(4.386+4.466+4.494+4.487+4.562+4.577+4.592+4.636+4.641)-b/3|/9；
Y 3 ＝|(a 3 -b/3)|/9＝|(4.693+4.714+4.699+4.751+4.761+4.738+4.815+4.810+4.774)-b/3|/9。
the second step, taking the actual brightness value of each pixel point in the target display area as a reference, for each display area S in the display screen i Initial luminance compensation value Y of (2) i Optimizing to obtain final brightness compensation value G i 。
Specifically, for each display area S i Determining the display area S i Actual brightness value a of each pixel point in (a) i Mean value of (c) and target display area S 2 Actual brightness value a of each pixel point in (a) 2 Ratio K of the means of (2) i The method comprises the steps of carrying out a first treatment on the surface of the Determination of G i ＝(1-K i +1)*Y i Wherein i denotes the number of the display area, K i Representing the ratio, Y i Representing the initial luminance compensation value.
Receiving the above example, G 1 ＝(1-a 1 /a 2 +1)*Y 1 ；G 2 ＝(1-a 2 /a 2 +1)*Y 2 ；G 3 ＝(1-a 3 /a 2 +1)*Y 3 。
The first step and the second step are respectively executed for a plurality of white pictures with different gray scales acquired by the CCD, so that the brightness compensation value of each display area Si under the different gray scales is obtained. The compensation is not good enough if the initial brightness compensation value obtained in the first step is directly used for compensation, and the optimized brightness compensation value has better compensation effect compared with the initial brightness compensation value.
In step S140, after determining the brightness compensation value of each display area under each gray level collected by the CCD according to step S130, an interpolation algorithm may be used to calculate each display area S under the remaining gray levels i To obtain each display area S i Brightness compensation values at the gray scales of 0 to 255.
In step S150, after the display screen leaves the factory, in the use process of the display screen, display may be performed based on the brightness compensated by the brightness compensation value. For example, the actual driving voltage of the display screen is controlled to be the sum of the voltage corresponding to the brightness compensation value and the theoretical voltage.
The brightness compensation method of the display screen provided by the embodiment can be suitable for the factory testing process of the display screen. The display screen includes a plurality of display areas including a target display area. When the display screen is determined to meet the brightness compensation condition, acquiring actual brightness values of all pixel points when the display screen displays a plurality of white pictures with different gray scales. For the white picture of each gray level, determining a brightness compensation value of the display area under the current gray level based on the actual brightness value of each pixel point in each display area, the actual brightness value of each pixel point in the target display area and the pre-stored target brightness value of the display screen, thereby obtaining the brightness compensation values of each display area under a plurality of different gray levels. The brightness compensation values at the remaining gray levels can be determined based on the brightness compensation values at a plurality of different gray levels for each display region. In the calculation process of the brightness compensation value, the initial compensation brightness value can be determined by the actual brightness value of each pixel point in the display area and the pre-stored target brightness value of the display screen, and the actual brightness value of each pixel point in the target display area is used for optimizing the initial compensation brightness value. And performing brightness compensation by using the brightness compensation value obtained after optimization, so as to ensure uniform brightness of the display screen.
Fig. 3 is a flowchart of a brightness compensation method of a display screen according to another embodiment of the application. The brightness compensation method 300 differs from the brightness compensation method 100 shown in fig. 1 in that the brightness compensation method 300 further includes determining a plurality of display areas S i And a process of displaying the area of the object. Specifically, the brightness compensation method 300 further includes the following steps performed before step S130.
Step S310, determining the brightness variation trend of the display screen based on any one of the white frames with different gray scales.
Step S320, dividing the display screen into a plurality of display areas according to the trend of brightness variation.
Among the reasons for uneven brightness of the display screen caused by current loss on the wiring, the uneven brightness occupies a relatively heavy area during the lifetime of the display screen, so that the brightness of the display screen will generally change linearly, i.e. the more far from the driving chip, the lower the light-emitting brightness of the OLED element. Based on this, step S310 may be specifically performed as:
first, any one of the white pictures is divided into a plurality of areas in a plurality of predetermined directions.
Since the driving traces of the display screen generally extend in the lateral or longitudinal direction of the display screen, the lateral and longitudinal directions of the display screen can be set to two predetermined directions. Any white frame may be the first frame of white frame collected by the CCD. The number of the plurality of regions and the number of the plurality of display regions are the same or different.
For example, fig. 4 is a schematic view of the display screen shown in fig. 3 divided in a horizontal direction and a vertical direction, respectively. As shown in fig. 4, the display screen is divided into 3 regions in the lateral and longitudinal directions, respectively.
Next, a luminance change trend is determined by a trend in which actual luminance values of the plurality of regions linearly change in a target direction, the target direction being selected from a plurality of predetermined directions.
In the above example, in the lateral division method, the actual luminance values of the plurality of regions are 4.320, 4.539, 4.751 in order. In the vertical division method, the actual luminance values of the plurality of areas are 4.320, 4.539, 4.751 in order. It can be seen that the actual brightness values of the plurality of regions in the vertical division manner change linearly, so that the brightness change trend of the display screen is determined as the linear change in the vertical direction.
After determining the brightness variation trend of the display screen according to step S310, in step S320, the display screen is divided into a plurality of display areas according to the brightness variation trend, that is, the display screen is divided into a plurality of display areas in the target direction.
In one example, the display screen is divided into an odd number of display areas. The brightness compensation method 300 further includes step S330 of determining a display area located at the center in the target direction as a target display area. The central display area is used as a target display area, namely, the middle brightness area on the brightness change rule is used as a reference, so that the brightness compensation values of the high brightness area and the low brightness area are not too large, and the memory requirement is low.
The application also provides a brightness compensation device of the display screen. Fig. 5 is a block diagram of a brightness compensation device according to an embodiment of the application. As shown in fig. 5, the brightness compensation device 50 includes a first determination module 51, an acquisition module 52, a second determination module 53, a third determination module 54, and a control module 55. The first determining module 51 is configured to determine that the display screen meets the brightness compensation condition. The obtaining module 52 is configured to obtain actual brightness values of each pixel point when the display screen displays a plurality of white images with different gray scales, where the display screen includes a plurality of display areas, and the plurality of display areas includes a target display area. The second determining module 53 is configured to determine brightness compensation values of the plurality of display areas at the plurality of different gray scales, where the brightness compensation value of each display area depends on an actual brightness value of each pixel point in the display area, an actual brightness value of each pixel point in the target display area, and a pre-stored target brightness value of the display screen. The third determining module 54 is configured to determine, for each display area, a brightness compensation value of the display area at the remaining gray levels based on the brightness compensation values of the display area at the plurality of different gray levels. The control module 55 is used for controlling the display screen to display according to the brightness compensated by the brightness compensation value.
In an example, the control module 55 is further configured to control the display screen to sequentially display the white frames with the plurality of different gray scales. The obtaining module 52 is specifically configured to collect actual brightness values of each pixel point in the white frames with different gray scales by using a photoelectric sensor.
In an example, the second determining module 53 is specifically configured to:
first, for each display area, an initial brightness compensation value is determined based on the actual brightness value of each pixel point in the display area and the target brightness value of the display screen. For example, for each display region, determining an actual luminance value for the display region based on actual luminance values for respective pixel points in the display region; determining a target brightness value of the display area based on the target brightness value of the display screen; determining an absolute value of a difference between an actual luminance value of the display area and a target luminance value of the display area; the ratio of the absolute value to the number of pixel points in the display area is determined as an initial brightness compensation value.
And secondly, optimizing the initial brightness compensation value by taking the actual brightness value of each pixel point in the target display area as a reference to obtain the brightness compensation value. For example, for each display area, determining a ratio of a mean value of actual brightness values of pixels in the display area to a mean value of actual brightness values of pixels in the target display area; determining a brightness compensation value G i ＝(1-K i +1)*Y i Wherein i represents the number of the display area，K i Express the ratio, Y i Representing the initial luminance compensation value.
The brightness compensation device of the display screen provided by the embodiment can be suitable for a factory testing process of the display screen. The display screen includes a plurality of display areas including a target display area. When the display screen is determined to meet the brightness compensation condition, acquiring actual brightness values of all pixel points when the display screen displays a plurality of white pictures with different gray scales. For the white picture of each gray level, determining a brightness compensation value of the display area under the current gray level based on the actual brightness value of each pixel point in each display area, the actual brightness value of each pixel point in the target display area and the pre-stored target brightness value of the display screen, thereby obtaining the brightness compensation values of each display area under a plurality of different gray levels. The brightness compensation values at the remaining gray levels can be determined based on the brightness compensation values at a plurality of different gray levels for each display region. In the calculation process of the brightness compensation value, the initial compensation brightness value can be determined by the actual brightness value of each pixel point in the display area and the pre-stored target brightness value of the display screen, and the actual brightness value of each pixel point in the target display area is used for optimizing the initial compensation brightness value. And performing brightness compensation by using the brightness compensation value obtained after optimization, so as to ensure uniform brightness of the display screen.
Fig. 6 is a block diagram of a brightness compensation device for a display screen according to another embodiment of the application. As shown in fig. 6, the brightness compensation device 60 further includes, in addition to the brightness compensation device 50 shown in fig. 5: a fourth determination module 61 and a division module 62. The fourth determining module 61 is configured to determine a brightness variation trend of the display screen based on any one of the white frames with different gray scales. The dividing module 62 is configured to divide the display screen into a plurality of display areas according to the trend of brightness variation.
In an example, the fourth determination module 61 specifically performs as: dividing any white picture into a plurality of areas in a plurality of preset directions respectively; determining the average value of the actual brightness values of all pixel points in each area; and determining the brightness change trend by the trend that the average value of the actual brightness values of the area linearly changes in the target direction, wherein the target direction is selected from a plurality of preset directions.
In one example, the luminance change trend is a linear change trend in the target direction. The partitioning module 62 specifically performs: in the target direction, the display screen is divided into an odd number of display areas. The brightness compensation device 60 further comprises a fifth determining module 63 for determining the centrally located display area as the target display area.
According to the brightness compensation device of the display screen, the display screen is divided into the plurality of display areas according to the brightness change trend of the display screen, so that the actual brightness average value of each display area used in the process of calculating the brightness compensation value can be ensured to be more reliable, and the compensation effect of the brightness compensation value is further improved.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (8)
1. A method for compensating brightness of a display screen, comprising:
determining that the display screen meets brightness compensation conditions;
the method comprises the steps that actual brightness values of pixel points when the display screen displays a plurality of white pictures with different gray scales are respectively obtained, wherein the display screen comprises a plurality of display areas, and the display areas comprise target display areas;
determining brightness compensation values of the display areas under the different gray scales respectively, wherein the brightness compensation value of each display area depends on an actual brightness value of each pixel point in the display area, an actual brightness value of each pixel point in the target display area and a prestored target brightness value of the display screen;
determining, for each display region, a brightness compensation value for the display region at a remaining gray scale based on the brightness compensation values for the display region at the plurality of different gray scales;
controlling the display screen to display according to the brightness compensated by the brightness compensation value;
wherein the determining the brightness compensation value of each of the plurality of display areas at the plurality of different gray scales includes:
for each display area, determining an actual brightness value of the display area based on the actual brightness value of each pixel point in the display area;
determining a target brightness value of the display area based on the target brightness value of the display screen;
determining an absolute value of a difference between the actual luminance value of the display area and a target luminance value of the display area;
determining the ratio of the absolute value to the number of pixel points in the display area as an initial brightness compensation value;
and optimizing the initial brightness compensation value by taking the actual brightness value of each pixel point in the target display area as a reference to obtain the brightness compensation value.
2. The method for compensating brightness of a display screen according to claim 1, wherein the obtaining actual brightness values of each pixel point when the display screen displays a plurality of white pictures with different gray scales respectively comprises:
controlling the display screen to sequentially display the white pictures with the different gray scales;
and respectively acquiring actual brightness values of all pixel points in the white pictures with different gray scales by adopting a photoelectric sensor.
3. The method for compensating brightness of a display screen according to claim 1, wherein optimizing the initial brightness compensation value based on an actual brightness value of each pixel point in the target display area to obtain the brightness compensation value comprises:
for each display area, determining the ratio of the average value of the actual brightness values of all the pixel points in the display area to the average value of the actual brightness values of all the pixel points in the target display area;
determining the brightness compensation value G i ＝(1-K i +1)*Y i Wherein i denotes the number of the display area, K i Representing the ratio, Y i Representing the initial luminance compensation value.
4. A method of compensating for brightness of a display screen according to any of claims 1-3, further comprising, prior to said determining brightness compensation values for each of said plurality of display regions at said plurality of different gray levels:
determining the brightness change trend of the display screen based on any one of the white pictures with different gray scales;
dividing the display screen into a plurality of display areas according to the brightness variation trend.
5. The method according to claim 4, wherein determining the brightness variation trend of the display screen based on any one of the plurality of white pictures of different gray scales comprises:
dividing the arbitrary white picture into a plurality of areas in a plurality of preset directions respectively;
determining the average value of the actual brightness values of all pixel points in each area;
and determining the brightness change trend by linearly changing the average value of the actual brightness values of the area in a target direction, wherein the target direction is selected from the plurality of preset directions.
6. The method according to claim 4, wherein the brightness variation trend is a linear variation trend in a target direction; the dividing the display screen into the plurality of display areas according to the brightness variation trend includes:
dividing the display screen into an odd number of display areas in the target direction;
the brightness compensation method further includes:
and determining the display area positioned in the center as the target display area.
7. A brightness compensation device for a display screen, comprising:
the first determining module is used for determining that the display screen meets brightness compensation conditions;
the display screen comprises a plurality of display areas, wherein the display areas comprise target display areas;
a second determining module, configured to determine brightness compensation values of the plurality of display areas at the plurality of different gray scales, where the brightness compensation value of each display area depends on an actual brightness value of each pixel point in the display area, an actual brightness value of each pixel point in the target display area, and a pre-stored target brightness value of the display screen;
a third determining module, configured to determine, for each display area, a brightness compensation value of the display area under the remaining gray scales based on the brightness compensation values of the display area under the plurality of different gray scales;
the control module is used for controlling the display screen to display according to the brightness compensated by the brightness compensation value;
wherein the determining the brightness compensation value of each of the plurality of display areas at the plurality of different gray scales includes:
for each display area, determining an actual brightness value of the display area based on the actual brightness value of each pixel point in the display area;
determining a target brightness value of the display area based on the target brightness value of the display screen;
determining an absolute value of a difference between the actual luminance value of the display area and a target luminance value of the display area;
determining the ratio of the absolute value to the number of pixel points in the display area as an initial brightness compensation value;
and optimizing the initial brightness compensation value by taking the actual brightness value of each pixel point in the target display area as a reference to obtain the brightness compensation value.
8. A computer device comprising a memory, a processor and a computer program stored on the memory for execution by the processor, characterized in that the processor, when executing the computer program, implements the steps of the brightness compensation method of a display screen according to any one of claims 1 to 6.
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| CN115942127A (en) * | 2022-11-30 | 2023-04-07 | 合肥维信诺科技有限公司 | Method, device and system for acquiring compensation basic data of display panel and storage medium |
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