CN114898706A - Brightness compensation method and device of display screen and computer equipment - Google Patents
Brightness compensation method and device of display screen and computer equipment Download PDFInfo
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- 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]
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Abstract
The application provides a brightness compensation method and device of 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 the brightness compensation condition; 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 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; aiming at each display area, determining the brightness compensation value of the display area under the other gray scales based on the brightness compensation value of the display area under the different gray scales; 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 of a display screen and computer equipment.
Background
An Organic Light Emitting Diode (OLED) Display screen has become one of the mainstream products of the Display device today by virtue of its advantages of no need of a backlight source, high contrast, thin thickness, wide viewing angle, fast response, wide temperature range, etc. However, the OLED display screen often has uneven brightness when being shipped, which affects the display effect.
Disclosure of Invention
In view of this, embodiments of the present application provide a method and an apparatus for compensating brightness of a display screen, and a computer device, so as to solve the problem of uneven brightness of a display screen in the prior art.
The application provides a brightness compensation method for a display screen in a first aspect, which includes: determining that the display screen meets the brightness compensation condition; 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 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; aiming at each display area, determining the brightness compensation value of the display area under the other gray scales based on the brightness compensation value of the display area under the different gray scales; 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 test process of the display screen, and can improve the brightness uniformity of the display screen.
In one embodiment, the respectively obtaining the actual brightness values of the pixel points when the display screen displays the white pictures with the different gray scales includes: controlling a display screen to sequentially display a plurality of white pictures with different gray scales; and acquiring the actual brightness values of all pixel points in the white pictures with different gray scales by adopting a photoelectric sensor.
In one embodiment, determining the brightness compensation values for the plurality of display regions at the plurality of different gray levels comprises: aiming at 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 the 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 a brightness compensation value. The original brightness compensation value is directly utilized to compensate possible points, so that the compensation effect is not good, and the optimized brightness compensation value has a better compensation effect compared with the original brightness compensation value.
In one embodiment, for each display area, determining an initial brightness compensation value based on an actual brightness value of each pixel point in the display area and a pre-stored target brightness value of the display screen includes: aiming at each display area, determining the 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 a target brightness value of the display screen; determining an absolute value of a difference between an actual brightness value of the display area and a target brightness value of the display area; and determining the ratio of the absolute value to the number of the pixel points in the display area as an initial brightness compensation value.
In one embodiment, optimizing the initial brightness compensation value with the actual brightness value of each pixel point in the target display area as a reference to obtain the brightness compensation value includes: 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 aiming at each display area; determining a luminance compensation value G i ＝(1-K i +1)*Y i Wherein i represents the number of the display area, K i Denotes the ratio, Y i Indicating the initial brightness compensation value.
In one embodiment, before determining the brightness compensation values of the plurality of display areas at the plurality of different gray scales, the method further comprises: determining the brightness variation trend of the display screen based on any one of the white pictures with different gray scales; and dividing the display screen into a plurality of display areas according to the brightness variation trend. The display screen is divided into a plurality of display areas according to the brightness variation trend of the display screen, so that the actual brightness mean value of each display area used in the brightness compensation value calculation process can be more reliable, and the compensation effect of the brightness compensation value is further improved.
In one embodiment, determining the brightness variation trend of the display screen based on any one of the plurality of white pictures with different gray scales comprises: dividing any white picture into a plurality of regions in a plurality of predetermined directions respectively; determining the average value of the actual brightness values of all the pixel points in each region; and determining the brightness variation trend by the linear variation trend of the average value of the actual brightness values of the areas in the target direction, wherein the target direction is selected from a plurality of preset directions. And the linear variation trend is adopted as the brightness variation trend to accord with the brightness variation rule of the display screen.
In one embodiment, the luminance variation tendency is a linear variation tendency in the target direction; dividing the display screen into a plurality of display areas according to the brightness variation trend includes: dividing a display screen into an odd number of display areas in a target direction; the brightness compensation method further includes: the display area located at the center is determined 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 second aspect of the present application provides a brightness compensation apparatus for a display screen, comprising: the first determining module is used for determining that the display screen meets the brightness compensation condition; the acquisition module is used for respectively acquiring the actual brightness value of each pixel point when the display screen displays a plurality of white pictures with different gray scales, 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 the brightness compensation values of the plurality of display areas under a plurality of different gray scales, and 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; the third determining module is used for determining the brightness compensation value of the display area under the other gray scales based on the brightness compensation value of the display area under the different gray scales aiming at each display area; 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, which includes a memory, a processor, and a computer program stored in the memory and executed by the processor, and when the processor executes the computer program, the steps of the brightness compensation method for a display screen provided in any of the above embodiments are implemented.
The brightness compensation method and device for the display screen and the computer equipment are suitable for the factory test process of the display screen. The display screen includes a plurality of display areas including a target display area. And when the display screen is determined to meet the brightness compensation condition, acquiring the actual brightness value of each pixel point when the display screen displays a plurality of white pictures with different gray scales. And determining a brightness compensation value of the display area under the current gray scale 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 a pre-stored target brightness value of the display screen aiming at the white picture of each gray scale, so as to obtain the brightness compensation value of each display area under a plurality of different gray scales. The brightness compensation values at the remaining gray levels can be determined based on the brightness compensation values at the plurality of different gray levels for each display region. In the calculation process of the brightness compensation value, the actual brightness value of each pixel point in the display area and the pre-stored target brightness value of the display screen can determine the initial compensation brightness value, and the actual brightness value of each pixel point in the target display area is used for optimizing the initial compensation brightness value. And subsequently, performing brightness compensation by using the brightness compensation value obtained after optimization to ensure that the brightness of the display screen is uniform.
Drawings
Fig. 1 is a flowchart of a brightness compensation method for a display screen according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a display screen according to an embodiment of the present application.
Fig. 3 is a flowchart of a brightness compensation method for a display screen according to another embodiment of the present disclosure.
Fig. 4 is a schematic structural view of the display screen shown in fig. 3 divided in the horizontal and vertical directions, respectively.
Fig. 5 is a block diagram of a luminance compensation apparatus according to an embodiment of the present disclosure.
Fig. 6 is a block diagram of a luminance compensation apparatus according to another embodiment of the present disclosure.
Detailed Description
As mentioned in the background art, the OLED display often has uneven brightness when it leaves the factory, and the reasons for this phenomenon include at least the following:
1. the luminous mode of OLED display screen is the current drive mode, and drive current receives the influence of walking the line impedance in transmission process for there is certain difference in theoretical drive current and the actual current of finally exporting for OLED component, and walks that the line is longer, and the difference is big more, and then influences the homogeneity of display module luminance.
2. Before the OLED display screen leaves a factory, a plurality of process procedures are needed, and the brightness of the OLED element is attenuated along with the change of time, so that the brightness of the display screen is uneven.
3. The OLED devices are usually mass-produced, and different OLED devices inevitably have process differences during the production process, resulting in uneven brightness.
In summary, the present application provides a brightness compensation method for a display screen, which can be applied to a test process before the display screen leaves a factory, and is used to ensure that the brightness of the display screen is uniform.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a flowchart of a brightness compensation method for a display screen according to an embodiment of the present disclosure. As shown in fig. 1, the luminance compensation method 100 includes:
and step S110, determining that the display screen meets the brightness compensation condition.
Step S120, respectively obtaining the actual brightness value of each pixel point when the display screen displays a plurality of white pictures with different gray scales. The display screen includes a plurality of display areas including a target display area.
Step S130, determining the brightness compensation values of the plurality of display regions under a plurality of different gray scales, where the brightness compensation value of each display region depends on the actual brightness value of each pixel in the display region, the actual brightness value of each pixel in the target display region, and the pre-stored target brightness value of the display screen.
Step S140, for each display region, determining the brightness compensation value of the display region at the rest gray levels based on the brightness compensation values of the display region at the different gray levels.
And S150, controlling the display screen to display according to the brightness compensated by the brightness compensation value.
The specific implementation process of the brightness compensation method 100 is described in detail below by taking a factory test 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 meets 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 the brightness threshold are the same so as to ensure that the two have comparability.
For example, in a factory test process, the brightness threshold may be a target brightness value of the entire display screen, that is, a brightness value of the display screen meeting a factory requirement. The current brightness can be obtained by detecting the 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 referred to herein is, for example, a Charge Coupled Device (CCD) image sensor.
For another example, the brightness threshold is a target brightness 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 brightness of the predetermined area for matching with the target brightness value to determine whether the brightness compensation condition is satisfied.
In step S120, when it is determined that the display screen satisfies the brightness compensation condition, the display screen may be controlled to sequentially display a plurality of white pictures with different gray scales, where the plurality of white pictures with different gray scales are white pictures with a plurality of preset gray scales; and then, acquiring the actual brightness value of each pixel point in each white picture by adopting a CCD image sensor.
In step S130, after the actual brightness values of the pixel points in the white frames of the plurality of different gray scales are obtained according to step S120, the brightness compensation values of the pixel points in the display regions under each gray scale 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 present application. As shown in FIG. 2, the display screen includes a plurality of display areas S i Wherein i denotes the ith display region, i.e., 1,2,3. A plurality of display regions S i Comprises a target display area selected from multiple display areas S i One of them. Accordingly, each white picture can be divided into a plurality of display regions S i And a plurality of sub-pictures in one-to-one correspondence. For example, the CCD image sensor collects white frames of 3 gray scales, i.e., 64 gray scale, 128 gray scale, and 255 gray scale, and each display region S can be obtained according to step S130 i The 3 brightness compensation values correspond to 64 gray levels, 128 gray levels and 255 gray levels respectively.
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 Determining the initial brightness compensation value Y according to the actual brightness value of each pixel point and the pre-stored target brightness value b of the display screen i . The target brightness value b of the display screen is the brightness value of the whole display screen meeting the factory requirements.
Specifically, first, for each display region S i Based on the display area S i Determining the display region S according to the actual brightness value of each pixel point i Actual brightness value a of i 。
Display area S i Actual brightness value a of i May be the display area S i The sum of the actual brightness values of all the pixels in the display area, or the product of the average value of the maximum actual brightness value and the minimum actual brightness value of the pixels in the display area and the number of the pixels. It should be understood that the display area S can be designed appropriately according to the actual situation i Actual brightness value a of i So long as the display region S can be approximately characterized i The overall actual brightness is sufficient.
Secondly, determining the display area S based on the target brightness value of the display screen i The target brightness value of (2).
For example, the display area S i Is the ratio of the target brightness value b of the display screen to the number of display areas.
Next, an absolute value of a difference between an actual luminance value of the display area and a 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 the pixel points in (1) is the initial brightness compensation value Y i 。
The following describes the initial luminance compensation value Y in detail by taking FIG. 2 as an example i The calculation process of (2). As shown in FIG. 2, the display screen includes 3 display regions S i The 3 display regions S i Linearly arranged, centrally located display area S i Display area S for the target 2 . Then 3 display areas S i Initial luminance compensation value Y of i 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。
secondly, taking the actual brightness value of each pixel point in the target display area as a reference, and carrying out comparison on each display area S in the display screen i Initial luminance compensation value Y of i Optimizing to obtain final brightness compensation value G i 。
Specifically, for each display region S i Determining the display area S i Actual brightness value a of each pixel point in i Mean value and target display area S 2 Actual brightness value a of each pixel point in 2 Ratio K of the mean values of i (ii) a Determination of G i ＝(1-K i +1)*Y i Wherein i represents the number of the display area, K i Denotes said ratio, Y i Indicating the initial brightness compensation value.
Receive 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 。
And respectively executing the first step and the second step aiming at a plurality of white pictures with different gray scales acquired by the CCD to obtain the brightness compensation value of each display area Si under the different gray scales. The initial brightness compensation value obtained in the first step is directly utilized to compensate possible points, so that the compensation effect of the optimized brightness compensation value is better than that of the initial brightness compensation value.
In step S140, after determining the brightness compensation value of each display region in each gray scale collected by the CCD according to step S130, an interpolation algorithm may be used to calculate each display region S in the remaining gray scales i Thereby obtaining each display region S i The respective brightness compensation values are in the gray scale of 0-255.
In step S150, after the display screen is shipped, the display screen may be displayed based on the brightness compensated by the brightness compensation value during the use process of the display screen. For example, the actual driving voltage for controlling the display screen is the sum of the voltage corresponding to the brightness compensation value and the theoretical voltage.
The brightness compensation method for the display screen provided by the embodiment can be suitable for the factory test process of the display screen. The display screen includes a plurality of display areas including a target display area. And when the display screen is determined to meet the brightness compensation condition, acquiring the actual brightness value of each pixel point when the display screen displays a plurality of white pictures with different gray scales. And determining a brightness compensation value of the display area under the current gray scale 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 a pre-stored target brightness value of the display screen aiming at the white picture of each gray scale, so as to obtain the brightness compensation value of each display area under a plurality of different gray scales. The brightness compensation values at the remaining gray levels can be determined based on the brightness compensation values at the plurality of different gray levels for each display region. In the calculation process of the brightness compensation value, the actual brightness value of each pixel point in the display area and the pre-stored target brightness value of the display screen can determine the initial compensation brightness value, and the actual brightness value of each pixel point in the target display area is used for optimizing the initial compensation brightness value. And subsequently, performing brightness compensation by using the brightness compensation value obtained after optimization to ensure that the brightness of the display screen is uniform.
Fig. 3 is a flowchart of a brightness compensation method for a display screen according to another embodiment of the present disclosure. The brightness compensation method 300 differs from the brightness compensation method 100 of FIG. 1 in that the brightness compensation method 300 further includes determining a plurality of display regions S i And a process of displaying the target area. Specifically, the brightness compensation method 300 further includes the following steps performed before step S130.
In step S310, a brightness variation trend of the display screen is determined based on any one of the white pictures with different gray scales.
In step S320, the display screen is divided into a plurality of display areas according to the brightness variation trend.
Among the reasons for the uneven brightness of the display screen during the lifetime of the display screen, the uneven brightness caused by the current loss on the wires is heavier, and therefore the brightness of the display screen will in most cases exhibit linear changes, i.e., the luminance of the OLED element farther from the driving chip is lower. Based on this, step S310 may be specifically executed as:
first, any white picture is divided into a plurality of regions in a plurality of predetermined directions.
Since the driving traces of the display screen usually 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 picture may be the first frame white picture acquired by the CCD. The number of the plurality of regions and the number of the plurality of display regions may be the same or different.
For example, fig. 4 is a schematic structural diagram of the display screen shown in fig. 3 divided in the horizontal and vertical directions, respectively. As shown in fig. 4, the display screen is divided into 3 regions in the lateral and longitudinal directions, respectively.
Secondly, a luminance variation trend is determined by a trend that actual luminance values of the plurality of regions linearly vary in a target direction, which is selected from a plurality of predetermined directions.
In the above example, the actual luminance values of the plurality of regions in the horizontal division method are 4.320, 4.539, and 4.751 in this order. In the vertical division scheme, the actual luminance values of the plurality of regions are 4.320, 4.539, 4.751 in this order. As can be seen, the actual luminance values of the plurality of regions in the longitudinal division mode linearly change, and then the luminance change trend of the display screen is determined as a linear change in the longitudinal 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 regions. The brightness compensation method 300 further includes a 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 luminance compensation apparatus according to an embodiment of the present disclosure. As shown in fig. 5, the luminance compensation apparatus 50 includes a first determining module 51, an obtaining module 52, a second determining module 53, a third determining module 54, and a control module 55. The first determining module 51 is configured to determine that the display screen satisfies the brightness compensation condition. The obtaining module 52 is configured to obtain actual brightness values of pixels when the display screen displays a plurality of white pictures with different gray scales, where the display screen includes a plurality of display areas, and the plurality of display areas include a target display area. The second determining module 53 is configured to determine brightness compensation values of the plurality of display regions under the plurality of different gray scales, where the brightness compensation value of each display region depends on an actual brightness value of each pixel in the display region, an actual brightness value of each pixel in the target display region, and a pre-stored target brightness value of the display screen. The third determining module 54 is configured to determine, for each display area, the brightness compensation value of the display area at the remaining gray scales based on the brightness compensation values of the display area at the different gray scales. The control module 55 is configured to control 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 pictures with the different gray scales. The obtaining module 52 is specifically configured to respectively collect actual luminance values of each pixel point in the white pictures with the multiple different gray scales by using a photoelectric sensor.
In an example, the second determining module 53 is specifically configured to:
firstly, aiming at each display area, determining an initial brightness compensation value 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 brightness value of the display region based on an actual brightness value of each pixel point in the display region; determining a target brightness value of the display area based on a target brightness value of the display screen; determining an absolute value of a difference between an actual brightness value of the display area and a target brightness value of the display area; and determining the ratio of the absolute value to the number of the pixel points in the display area 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 all pixel points in the display area to a mean value of actual brightness values of all pixel points in the target display area; determining a luminance compensation value G i ＝(1-K i +1)*Y i Wherein i represents the number of the display area, K i Denotes the ratio, Y i Indicating the initial brightness compensation value.
The brightness compensation device for the display screen provided by the embodiment can be suitable for the factory test process of the display screen. The display screen includes a plurality of display areas including a target display area. And when the display screen is determined to meet the brightness compensation condition, acquiring the actual brightness value of each pixel point when the display screen displays a plurality of white pictures with different gray scales. And determining a brightness compensation value of the display area under the current gray scale 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 a pre-stored target brightness value of the display screen aiming at the white picture of each gray scale, so as to obtain the brightness compensation value of each display area under a plurality of different gray scales. The brightness compensation values at the remaining gray levels can be determined based on the brightness compensation values at the plurality of different gray levels for each display region. In the calculation process of the brightness compensation value, the actual brightness value of each pixel point in the display area and the pre-stored target brightness value of the display screen can determine the initial compensation brightness value, and the actual brightness value of each pixel point in the target display area is used for optimizing the initial compensation brightness value. And subsequently, performing brightness compensation by using the brightness compensation value obtained after optimization to ensure that the brightness of the display screen is uniform.
Fig. 6 is a block diagram of a brightness compensation apparatus for a display screen according to another embodiment of the present disclosure. As shown in fig. 6, the luminance compensation device 60 further includes, in addition to the luminance 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 pictures with different gray scales. The dividing module 62 is used for dividing the display screen into a plurality of display areas according to the brightness variation trend.
In an example, the fourth determining module 61 is specifically implemented as: dividing any white picture into a plurality of regions in a plurality of predetermined directions respectively; determining the average value of the actual brightness values of all the pixel points in each region; and determining the brightness variation trend by the linear variation trend of the average value of the actual brightness values of the areas in the target direction, wherein the target direction is selected from a plurality of preset directions.
In one example, the luminance variation tendency is a linear variation tendency in the target direction. The partitioning module 62 is specifically implemented as: 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 provided by the embodiment, the display screen is divided into a plurality of display areas according to the brightness variation trend of the display screen, so that the actual brightness mean 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, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (10)
1. A method for compensating brightness of a display screen, comprising:
determining that the display screen meets the brightness compensation condition;
respectively acquiring actual brightness values of all pixel points when the display screen displays a plurality of white pictures with different gray scales, wherein the display screen comprises a plurality of display areas, and the display areas comprise target display areas;
determining brightness compensation values of the plurality of display areas under the plurality of different gray scales, wherein the brightness compensation value of each display area depends on actual brightness values of all pixel points in the display areas, actual brightness values of all pixel points in the target display area and pre-stored target brightness values of the display screen;
for each display area, determining brightness compensation values of the display area under the rest gray scales based on the brightness compensation values of the display area under the different gray scales;
and controlling the display screen to display according to the brightness compensated by the brightness compensation value.
2. The method of claim 1, wherein the obtaining the actual brightness values of the pixels when the display screen displays white pictures with different gray scales comprises:
controlling the display screen to sequentially display the white pictures with the different gray scales;
and acquiring the actual brightness values of all the pixel points in the white pictures with different gray scales by adopting a photoelectric sensor.
3. The method of claim 1, wherein the determining the brightness compensation values for the plurality of display regions at the plurality of different gray levels comprises:
aiming at each display area, determining an initial brightness compensation value based on the actual brightness value of each pixel point in the display area and the target brightness value of the 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.
4. The method of claim 3, wherein the determining, for each display region, an initial brightness compensation value based on actual brightness values of pixels in the display region and a target brightness value of the display screen comprises:
for each display area, determining the 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 a 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;
and determining the ratio of the absolute value to the number of the pixel points in the display area as the initial brightness compensation value.
5. The method of claim 3, wherein the optimizing the initial brightness compensation value based on the actual brightness value of each pixel in the target display area to obtain the brightness compensation value comprises:
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 for each display area;
determining the brightness compensation value G i ＝(1-K i +1)*Y i Wherein i represents the number of the display area, K i Denotes said ratio, Y i Indicating the initial brightness compensation value.
6. The method for compensating brightness of a display screen according to any one of claims 1-5, wherein before said determining the brightness compensation values of each of said plurality of display regions at said plurality of different gray levels, further comprising:
determining the brightness variation trend of the display screen based on any one of the white pictures with different gray scales;
and dividing the display screen into a plurality of display areas according to the brightness change trend.
7. The method of claim 6, wherein the determining the trend of the brightness change of the display screen based on any one of the plurality of white pictures with different gray scales comprises:
dividing the any white picture into a plurality of regions in a plurality of predetermined directions respectively;
determining the average value of the actual brightness values of all the pixel points in each region;
determining the brightness variation trend by the trend that the average value of the actual brightness values of the area linearly varies in a target direction, wherein the target direction is selected from the plurality of predetermined directions.
8. The luminance compensation method of a display screen according to claim 6, wherein the luminance variation tendency is a linear variation tendency in a target direction; the dividing the display screen into the plurality of display areas according to the trend of the brightness change comprises:
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.
9. A brightness compensation apparatus for a display screen, comprising:
the first determining module is used for determining that the display screen meets the brightness compensation condition;
the acquisition module is used for respectively acquiring the actual brightness value of each pixel point when the display screen displays a plurality of white pictures with different gray scales, the display screen comprises a plurality of display areas, and the display areas comprise target display areas;
a second determining module, configured to determine brightness compensation values of the plurality of display regions under the plurality of different gray scales, where the brightness compensation value of each display region depends on an actual brightness value of each pixel in the display region, an actual brightness value of each pixel in the target display region, 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 at the remaining gray scales based on the brightness compensation values of the display area at the 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.
10. 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 realizes the steps of the brightness compensation method of a display screen according to any one of claims 1 to 8 when executing the computer program.
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