CN112614468A - Brightness compensation method and system of display panel - Google Patents
Brightness compensation method and system of display panel 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3607—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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
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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
- G09G2320/00—Control of display operating conditions
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Abstract
The invention discloses a brightness compensation method and system of a display panel. The first gray-scale value of the target display area can be calculated according to the first brightness at the target position in the display area of the display panel and the second brightness of the pixels in the target display area, wherein the number of the pixels in the target display area is the first pixel number N1. And based on the first gray-scale value, the second gray-scale value and the third gray-scale value, the first pixel quantity can determine a second pixel quantity N2 corresponding to the second gray-scale value and a third pixel quantity N3 corresponding to the third gray-scale value when the target constraint condition is met, so that the N2 second gray-scale values and the N3 third gray-scale values are distributed in the target display area, the absolute value of the difference value between the first gray-scale sum and the second gray-scale sum in the target display area can be minimized, the brightness compensation precision of the display panel is improved, and the quality of an LCD display picture is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a brightness compensation method and system of a display panel.
Background
With the development of Display technology and the advantages of Liquid Crystal Displays (LCDs), such as power saving, no radiation, long service life, etc., LCDs have been dominant in the field of Display technology.
Due to defects in the production process and the like, the brightness of the display panel of the produced LCD is not uniform, namely the Mura phenomenon. At present, in the related art, although the brightness of the display panel is compensated, the brightness compensation precision is low, so that the brightness jump of the compensated display panel occurs.
Disclosure of Invention
The invention provides a brightness compensation method and system of a display panel, which improve the brightness compensation precision of the display panel, thereby improving the quality of an LCD display picture.
In a first aspect, an embodiment of the present invention provides a method for compensating brightness of a display panel, where the method includes:
calculating a first gray-scale value of a target display area according to a first brightness at a target position in the display area of the display panel and a second brightness of pixels in the target display area, wherein the number of the pixels in the target display area is N1;
rounding the first gray scale value upwards to obtain a second gray scale value, and rounding the first gray scale value downwards to obtain a third gray scale value;
determining a second pixel number N2 corresponding to the second gray-scale value and a third pixel number N3 corresponding to the third gray-scale value when the target constraint condition is met according to the first gray-scale value, the second gray-scale value, the third gray-scale value and the first pixel number N1;
compensating the second brightness of the pixels in the target display area to the first brightness according to the second gray-scale value, the second pixel quantity N2, the third gray-scale value and the third pixel quantity N3;
the target constraints are: the absolute value of the difference value between the gray scale sum of the first pixel and the gray scale sum of the second pixel in the target display area is minimum;
the first pixel gray-scale sum is the product of the first gray-scale value and the first pixel number N1; the second pixel gray scale sum is the sum of a first product and a second product, and the first product is the product of the second gray scale value and the first numerical value N2'; the second product is the product of the third gray-scale value and a second value N3 ', the sum of the first value N2 ' and the second value N3 ' is the first pixel number N1, the value range of the first value N2 ' is [0, N1-N3 ' ], the value range of the second value N3 ' is [0, N1-N2 ' ], and the sum of the second pixel number N2 and the third pixel number N3 is the first pixel number N1; n1, N2, N3, N2 'and N3' are all positive integers.
In a second aspect, an embodiment of the present invention provides a method for compensating brightness of a display panel, where the method includes:
executing the brightness compensation method of the display panel in the first aspect under a plurality of preset gray scales, and determining a target relation curve of each preset gray scale and brightness;
determining a second brightness corresponding to each gray scale in all gray scales based on a preset algorithm and a target relation curve corresponding to each preset gray scale;
generating a gray scale-brightness compensation curve according to all the gray scales and the second brightness;
and storing the gray scale-brightness compensation curve into a storage module of the display panel so as to perform brightness compensation through the gray scale-brightness compensation curve when the display panel displays a picture.
In a third aspect, an embodiment of the present invention provides a brightness compensation system for a display panel, where the brightness compensation system includes a brightness compensation device for a display panel and the display panel
The brightness compensation device of the display panel comprises:
the calculation module is used for calculating a first gray-scale value of a target display area according to a first brightness at a target position in the display area of the display panel and a second brightness of pixels in the target display area, wherein the number of the pixels in the target display area is a first pixel number N1;
the rounding module is used for rounding the first gray value upwards to obtain a second gray value, and rounding the first gray value downwards to obtain a third gray value;
a determining module, configured to determine, according to the first gray scale value, the second gray scale value, the third gray scale value, and the first pixel number N1, a second pixel number N2 corresponding to the second gray scale value and a third pixel number N3 corresponding to the third gray scale value when a target constraint condition is satisfied;
a compensation module, configured to compensate the second luminance of the pixel in the target display area to the first luminance according to the second gray scale value and the second number of pixels N2, the third gray scale value and the third number of pixels N3;
the target constraint conditions are as follows: the difference absolute value of the gray scale sum of the first pixel and the gray scale sum of the second pixel in the target display area is minimum;
the first pixel gray-scale sum is the product of the first gray-scale value and the first pixel number N1; the second pixel gray scale sum is the sum of a first product and a second product, and the first product is the product of the second gray scale value and a first numerical value N2'; the second product is a product of the third gray-scale value and a second value N3 ', the sum of the first value N2 ' and the second value N3 ' is the first pixel number N1, the range of the first value N2 ' is [0, N1-N3 ' ], the range of the second value N3 ' is [0, N1-N2 ' ], and the sum of the second pixel number N2 and the third pixel number N3 is the first pixel number N1; n1, N2, N3, N2 'and N3' are all positive integers.
According to the brightness compensation method and system of the display panel, firstly, the first gray-scale value of the target display area can be calculated according to the first brightness of the target position in the display area of the display panel and the second brightness of the pixels in the target display area, wherein the number of the pixels in the target display area is the first pixel number N1. And then rounding the first gray-scale value upwards and rounding the first gray-scale value downwards to obtain a second gray-scale value and a third gray-scale value respectively, so that based on the first gray-scale value, the second gray-scale value, the third gray-scale value and the first pixel number, the second pixel number N2 corresponding to the second gray-scale value and the third pixel number N3 corresponding to the third gray-scale value can be determined when the target constraint condition is met, so that the N2 second gray-scale values and the N3 third gray-scale values are distributed in the target display area, the absolute value of the difference value between the first gray-scale sum and the second gray-scale sum in the target display area can be minimized, the brightness compensation precision of the display panel can be improved, and the quality of an LCD display picture can be improved.
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Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.
Fig. 1 is a flowchart illustrating a brightness compensation method for a display panel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for determining luminance corresponding to a pixel according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a distribution of gray scale values in a target display area according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a distribution of gray scale values in a target display area according to another embodiment of the present invention;
FIG. 6 is a diagram illustrating a distribution of gray scale values in a target display area according to another embodiment of the present invention;
FIG. 7 is a diagram illustrating a distribution of gray scale values in a target display area according to another embodiment of the present invention;
FIG. 8 is a flowchart illustrating a brightness compensation method for a display panel according to another embodiment of the present invention;
FIG. 9 is a schematic diagram illustrating a structure of a brightness compensation system of a display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram illustrating a brightness compensation apparatus of a display panel according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram illustrating a brightness compensation apparatus of a display panel according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.
At present, when the gray scales of the display areas of the display panel are the same, the brightness may be non-uniform, and it is necessary to compensate the brightness of the display areas of the display panel to the same brightness by performing brightness compensation. However, when all the luminances of the display area are compensated to the same luminance, the gray-scale value corresponding to each pixel in the display area needs to be adjusted. In the implementation of this embodiment, the inventor finds that the gray scale compensation value is a decimal, and the adjusted gray scale value of each pixel is also a decimal and needs to be approximated to an integer value, so that the brightness compensation precision is low after the adjusted gray scale value is approximated to a positive number, and the brightness jump phenomenon exists in the LCD display screen due to the low compensation precision caused by the sensitivity of human eyes to the low gray scale brightness change.
Based on this, the embodiment of the invention provides a brightness compensation method and system for a display panel, which improve the brightness compensation precision of the display panel, thereby improving the quality of an LCD display picture. The following describes the brightness compensation method of the display panel provided by the present invention in detail.
Fig. 1 is a flowchart illustrating a method 100 for compensating brightness of a display panel according to an embodiment of the present invention.
As shown in fig. 1, the method for compensating brightness of a display panel according to an embodiment of the present invention may include S101 to S104.
S101: a first gray-scale value of the target display area is calculated according to a first brightness at the target position in the display area of the display panel and a second brightness of pixels in the target display area, wherein the number of the pixels in the target display area is N1.
S102: and rounding the first gray scale value upwards to obtain a second gray scale value, and rounding the first gray scale value downwards to obtain a third gray scale value.
S103: and determining a second pixel number N2 corresponding to the second gray-scale value and a third pixel number N3 corresponding to the third gray-scale value when the target constraint condition is met according to the first gray-scale value, the second gray-scale value, the third gray-scale value and the first pixel number N1.
S104: and compensating the second brightness of the pixels in the target display area to the first brightness according to the second gray-scale value, the second pixel quantity N2, the third gray-scale value and the third pixel quantity N3.
The target constraints are: the absolute value of the difference value between the gray scale sum of the first pixel and the gray scale sum of the second pixel in the target display area is minimum;
the first pixel gray-scale sum is the product of the first gray-scale value and the first pixel number N1; the second pixel gray scale sum is the sum of a first product and a second product, and the first product is the product of the second gray scale value and the first numerical value N2'; the second product is the product of the third gray-scale value and a second value N3 ', the sum of the first value N2 ' and the second value N3 ' is the first pixel number N1, the value range of the first value N2 ' is [0, N1-N3 ' ], the value range of the second value N3 ' is [0, N1-N2 ' ], and the sum of the second pixel number N2 and the third pixel number N3 is the first pixel number N1; n1, N2, N3, N2 'and N3' are all positive integers.
S101 to S104 will be described in detail below.
First, S101 is described.
As shown in fig. 2, the display panel includes a non-display area 21 and a display area 22. The display area of the display panel includes a target position, for example, the target position may be an edge position of the display area, or may be a center position of the display area.
The display panel comprises a plurality of pixel points, each pixel point comprises a plurality of pixels, each pixel is divided into a plurality of target display areas, and each area comprises a plurality of pixels. Such as the target display area 23 shown in fig. 2.
Here, the display area of the display panel may include a plurality of target display areas 23, wherein in the process of dividing the display area of the display panel, the display area of the display panel may be divided according to the size or resolution of the display area, and a plurality of target display areas are obtained, that is, the number of target display areas in the display area of the display panel is related to the size or resolution of the display area. The size of each target display area is the same. The target display area and the target display area are distributed adjacently. The target display area may include N1 pixels, i.e., the number of pixels in the target display area is the first number of pixels N1. Wherein, the pixels in the target display area are distributed in an M1 xM 2 mode, wherein M1 xM 2 is N1, and M1 and M2 are positive integers. Illustratively, M1 and M2 may be equal. For example, the target display area includes 9 pixels, wherein the 9 pixels are distributed in a 3 × 3 manner.
When the brightness of the target display area 23 is compensated, the gray-scale values corresponding to the pixels in the target display area may be adjusted.
And calculating a corresponding first gray-scale value when the target display area is subjected to brightness compensation according to the first brightness at the target position and the second brightness of each pixel in the target display area. Here, the first luminance and the second luminance are not equal.
Specifically, a first gray-scale value of the target display area is calculated when the second brightness of each pixel in the target display area is compensated to the first brightness.
For example, the gray scale value corresponding to the display area of the current display panel is 25, and after the second luminance corresponding to each pixel in the target display area is compensated to the first luminance corresponding to the target position, the gray scale value corresponding to each pixel in the target display area is 26.5.
In some embodiments, before S101, it is further required to obtain a second brightness of each pixel in the target display area. For example, the second brightness of each pixel in the target display area may be extracted from the picture corresponding to the target display area, and the second brightness of each pixel in the target display area may also be directly identified by a brightness test device.
Specifically, in some embodiments, as shown in fig. 3, the second luminance may be acquired through the following steps S301 to S303.
S301: and acquiring a target picture of the display area.
Illustratively, the target picture may be taken of the display area by a charge coupled device camera.
S302: and matching the position of each pixel in the display area according to the position of each pixel in the pixel data corresponding to the target picture in the target picture.
The position of each pixel in the target picture needs to correspond to the position of the pixel in the display area, so that the pixel in the target display area can be determined.
S303: and extracting second brightness corresponding to each pixel in the target display area according to the position of each pixel in the display area.
After determining the location of each pixel in the display area, the pixels in the target display area can be determined. And extracting second brightness corresponding to each pixel in the target display area.
The gray scale corresponding to each pixel in the photo can be converted into the second brightness according to the gray scale corresponding to each pixel in the photo and a preset coefficient.
Next, S102 is introduced.
Since the gray scale value is a positive number, in the case where the first gray scale value is a decimal, rounding processing needs to be performed on the first gray scale value. Specifically, the first gray level value needs to be rounded up to obtain the second gray level value. And rounding the first gray scale value downwards to obtain a third gray scale value. And the second gray-scale value and the third gray-scale value are distributed in the target display area, so that the brightness compensation is carried out on the target display area.
Therefore, the gray-scale value in the target display area is not a compensation result obtained by approximately rounding the first gray-scale value, so that the compensated gray-scale value has more accurate precision after compensation.
Then, S103 is introduced.
After the second gray-scale value and the third gray-scale value are determined, the distribution number of the second gray-scale value and the third gray-scale value in the target display area needs to be determined, that is, the number of pixels corresponding to the second gray-scale value in the target display area and the number of pixels corresponding to the third gray-scale value in the target display area.
In order to ensure the precision after the brightness compensation and thus improve the quality of the display picture, the number of the second gray-scale value and the third gray-scale value distributed in the target display area may be controlled by the target constraint condition. The target constraint condition is that the absolute value of the difference value between the gray scale sum of the first pixel and the gray scale sum of the second pixel in the target display area is minimum. Wherein, the first pixel gray-scale sum is the product of the first gray-scale value and the first pixel quantity N1; the second pixel gray scale sum is the sum of a first product and a second product, and the first product is the product of the second gray scale value and the first numerical value N2'; the second product is the product of the third gray-scale value and a second value N3 ', the sum of the first value N2 ' and the second value N3 ' is the first pixel number N1, the value range of the first value N2 ' is [0, N1-N3 ' ], the value range of the second value N3 ' is [0, N1-N2 ' ], and the sum of the second pixel number N2 and the third pixel number N3 is the first pixel number N1; n1, N2, N3, N2 'and N3' are all positive integers. That is, the first pixel grayscale sum H1 in the target display region satisfies the following formula (1):
H1＝N1×A (1)
the second pixel grayscale sum H2 satisfies the following formula (2):
H2＝N2＇×B+N3＇×C (2)
therefore, the absolute value E of the difference between the first pixel gray scale sum and the second pixel gray scale sum satisfies the following formula (1):
E＝|N1×A-(N2＇×B+N3＇×C)| (1)
wherein, a represents a first gray scale value, B represents a second gray scale value, C represents a third gray scale value, N1 represents the number of pixels in the target display region, i.e. the first number of pixels, N2 'and N3' are both numerical values, wherein the value range of the first numerical value N2 'is [0, N1-N3' ], and the value range of the second numerical value N3 'is [0, N1-N2' ].
Specifically, since the first value and the second value have a value range, the second pixel gray scale sum varies with the value of N2 'and N3'. And respectively calculating the corresponding absolute difference value of the first numerical value N2 'in each value, wherein the value range of N2' is (0, N1), and N3 'is N1-N2'. Then comparing the magnitude of the plurality of difference absolute values to obtain the minimum difference absolute value in the plurality of difference absolute values; and determining the value of N2 'corresponding to the minimum absolute difference value as the value of N2 of the second pixel number, and determining the value of N1-N2' as the value of N3 of the third pixel number.
For example, as shown in fig. 4, there are 9 pixels in the target display area, and the desired compensated gray scale value corresponding to the target display area is 26.5 × 9, that is, 238.5. Rounding up to 27 is performed for 26.5 and rounding down to 26 is performed. When the number of the gray scales 26 distributed in the target display area is 1, the number of the gray scales 27 distributed in the target display area is 8; when the number of the gray scales 26 distributed in the target display area is 2, the number of the gray scales 27 distributed in the target display area is 7; when the number of the gray scales 26 distributed in the target display area is 3, the number of the gray scales 27 distributed in the target display area is 6, and so on until the N2 'traverses to 8, thereby calculating the absolute value of the difference value of the N2' in different values. And taking the corresponding N2' when the absolute value of the difference is minimum as the second pixel number N2, and taking the values of N1-N2 as the third pixel number N3.
Therefore, the error between the actual compensated gray-scale value and the expected compensated gray-scale value is small, and the precision of brightness compensation is improved.
Finally, S104 is introduced.
After the first number N2 of the second gray-scale values and the second number N3 corresponding to the third gray-scale values are determined, the second gray-scale values and the third gray-scale values are distributed in a sub-area corresponding to each pixel in the target display area according to the first number N2 and the second number N3, so that the brightness of the target display area is compensated, and the second brightness corresponding to each pixel in the target display area is compensated to the first brightness.
Thus, the brightness of the display area of the display panel is compensated to the first brightness,
in some embodiments, the second luminance of the pixels in the target display area may be compensated to the first luminance in such a manner that the second and third gray-scale values are uniformly distributed in the target display area.
For example, when there are 9 pixels in the target display area, N2 is 4, and N3 is 5, the absolute value of the difference is the smallest, the gray- scale values 26 and 27 are distributed in such a manner that the gray- scale values 26 and 27 are alternately distributed in the row direction and the column direction as shown in fig. 5, and the gray-scale values 27 are distributed at the four corners of the target display area.
In some embodiments, the second brightness of the pixels in the target display area is compensated to the first brightness in a manner that at least one third gray scale value distribution is interspersed between two second gray scale values.
For example, as shown in fig. 6, the second luminance of the pixels in the target display area may be compensated to the first luminance in such a manner that the gray scale values of the pixels in the odd-numbered rows are the second gray scale values and the gray scale values of the pixels in the even-numbered rows are the third gray scale value distribution.
For another example, as shown in fig. 7, the second luminance of the pixels in the target display area may be compensated to the first luminance in a manner that the gray scale values of the pixels in the odd-numbered columns are the third gray scale values and the gray scale values of the pixels in the even-numbered columns are the second gray scale values.
According to the brightness compensation method of the display panel provided by the embodiment of the invention, firstly, the first gray-scale value of the target display area can be calculated according to the first brightness of the target position in the display area of the display panel and the second brightness of the pixels in the target display area, wherein the number of the pixels in the target display area is the first pixel number N1. And then rounding the first gray-scale value upwards and rounding the first gray-scale value downwards to obtain a second gray-scale value and a third gray-scale value respectively, so that based on the first gray-scale value, the second gray-scale value, the third gray-scale value and the first pixel number, the second pixel number N2 corresponding to the second gray-scale value and the third pixel number N3 corresponding to the third gray-scale value can be determined when the target constraint condition is met, so that the N2 second gray-scale values and the N3 third gray-scale values are distributed in the target display area, the absolute value of the difference value between the first gray-scale sum and the second gray-scale sum in the target display area can be minimized, the brightness compensation precision of the display panel can be improved, and the quality of an LCD display picture can be improved.
Based on the above embodiment, the embodiment of the present invention further provides another brightness compensation method for a display panel, which can improve the precision of compensating the brightness of the display panel under different gray scales, thereby improving the quality of the display screen.
Fig. 8 is a flowchart illustrating a method 800 for compensating brightness of a display panel according to an embodiment of the present invention.
As shown in fig. 8, a method 800 for compensating brightness of a display panel according to an embodiment of the present invention may include S801 to S804.
S801: and determining a target relation curve of each preset gray scale and the brightness under the plurality of preset gray scales.
S802: and determining a third brightness corresponding to each gray scale in all gray scales based on a preset algorithm and a target relation curve corresponding to each preset gray scale.
S803: and generating a gray scale-brightness compensation curve according to all the gray scales and the third brightness.
S804: and storing the gray scale-brightness compensation curve into a storage module of the display panel so as to perform brightness compensation through the gray scale-brightness compensation curve when the display panel displays a picture.
Specifically, the target relationship curve of each preset gray scale and brightness may be determined by performing the steps in the method shown in fig. 1.
The preset gray scales at least comprise three different first gray scales, second gray scales and third gray scales. The value ranges of the first gray scale, the second gray scale and the third gray scale are all 0 gray scale to 255 gray scale, for example, 0 gray scale, 25 gray scale, 60 gray scale and 255 gray scale.
And determining the third brightness after brightness compensation is carried out on each gray scale from the 0 gray scale to the 255 gray scale based on a preset algorithm and a target relation curve corresponding to each preset gray scale. For example, the brightness compensation of each pixel at a preset gray scale is expanded to be performed at any gray scale of 0 to 255 by an interpolation algorithm. For example, the predetermined gray levels are 0 gray level, 25 gray level, and 255 gray level. According to a target relation curve corresponding to a preset gray scale, the 3 gray scales can be expanded, so that the brightness of any gray scale from 0 gray scale to 255 gray scale is obtained.
After obtaining the brightness at any gray level, a gray level-brightness compensation curve may be generated and stored in a storage module, for example, a driving IC, a memory bank in a display panel, or the like, so as to perform brightness compensation through the gray level-brightness compensation curve when the display panel displays a picture.
Therefore, the gray scale compensation method provided by the embodiment of the invention simplifies the gray scale compensation process, and the corresponding brightness under different gray scales can be quickly obtained by utilizing the interpolation method. And the target relation curve is determined by the method shown in fig. 1, so that the brightness compensation precision of the display panel can be improved, and the quality of a display picture can be improved.
Fig. 9 is a schematic structural diagram illustrating a brightness compensation system 900 of a display panel according to an embodiment of the present invention.
As shown in fig. 9, the brightness compensation system 900 of the display panel according to the embodiment of the present invention may include a brightness compensation device 91 of the display panel and a display panel 92.
As shown in fig. 10, the brightness compensation apparatus 91 of the display panel may include a calculating module 1011, a rounding module 1012, a determining module 1013, and a compensating module 1014.
A calculating module 1011, configured to calculate a first gray-scale value of a target display area according to a first luminance at a target position in a display area of the display panel and a second luminance of a pixel in the target display area, where the number of pixels in the target display area is the first number of pixels N1;
a rounding module 1012, configured to round the first gray scale value upwards to obtain a second gray scale value, and round the first gray scale value downwards to obtain a third gray scale value;
the determining module 1013 is configured to determine, according to the first gray-scale value, the second gray-scale value, the third gray-scale value, and the first pixel number N1, a second pixel number N2 corresponding to the second gray-scale value and a third pixel number N3 corresponding to the third gray-scale value when the target constraint condition is satisfied;
a compensation module 1014 for compensating the second brightness of the pixels in the target display area to the first brightness according to the second gray-scale value and the second pixel number N2, the third gray-scale value and the third pixel number N3;
the target constraints are: the absolute value of the difference value between the gray scale sum of the first pixel and the gray scale sum of the second pixel in the target display area is minimum;
the first pixel gray-scale sum is the product of the first gray-scale value and the first pixel number N1; the second pixel gray scale sum is the sum of a first product and a second product, and the first product is the product of the second gray scale value and the first numerical value N2'; the second product is the product of the third gray-scale value and a second value N3 ', the sum of the first value N2 ' and the second value N3 ' is the first pixel number N1, the value range of the first value N2 ' is [0, N1-N3 ' ], the value range of the second value N3 ' is [0, N1-N2 ' ], and the sum of the second pixel number N2 and the third pixel number N3 is the first pixel number N1; n1, N2, N3, N2 'and N3' are all positive integers.
In some embodiments of the present invention, the brightness compensation system 900 of the display panel may further include a charge coupled device camera, wherein the charge coupled device camera is configured to capture a target picture corresponding to the display area of the display panel.
In some embodiments of the present invention, the calculating module 1011 of the brightness compensation apparatus 91 of the display panel is specifically configured to calculate a first gray-scale value of the target display area when the second brightness of each pixel in the target display area is compensated to the first brightness.
In some embodiments of the present invention, the brightness compensation apparatus 91 of the display panel may further include an obtaining module for obtaining the second brightness of the pixel in the target display area.
In some embodiments of the present invention, the obtaining module in the brightness compensation apparatus 91 of the display panel specifically includes:
the acquisition unit is used for acquiring a target picture of the display area;
the matching unit matches the position of each pixel in the display area according to the position of each pixel in the target picture in the pixel data corresponding to the target picture;
and the extraction unit is used for extracting the second brightness corresponding to each pixel in the target display area according to the position of each pixel in the display area.
In some embodiments of the present invention, the determining module 1013 in the brightness compensation apparatus 91 of the display panel may include:
the calculating unit is used for respectively calculating the absolute value of the difference corresponding to each value of the first numerical value N2 ', N2' belongs to (0, N1);
the comparison unit is used for comparing the magnitude of the plurality of difference absolute values to obtain the minimum difference absolute value in the plurality of difference absolute values;
and the determining unit is used for determining the value of the corresponding N2' when the absolute value of the minimum difference value is the value N2 of the second pixel number, and the values of N1-N2 are the values of the third pixel number N3.
In some embodiments of the present invention, the compensation module 1014 of the brightness compensation apparatus 91 of the display panel is specifically configured to compensate the second brightness of the pixel in the target display area to the first brightness in a manner that the second gray-scale value and the third gray-scale value are uniformly distributed in the target display area.
In some embodiments of the present invention, the compensation module 1014 of the brightness compensation apparatus 91 of the display panel is specifically configured to compensate the second brightness of the pixel in the target display area to the first brightness in a manner of interleaving at least one third gray-scale value distribution between two second gray-scale values.
In some embodiments of the present invention, the compensation module 1014 of the brightness compensation apparatus 91 of the display panel is specifically configured to compensate the second brightness of the pixels in the target display area to the first brightness according to a distribution that the gray-scale values of the pixels in the odd-numbered rows are the second gray-scale value and the gray-scale values of the pixels in the even-numbered rows are the third gray-scale value.
In some embodiments of the present invention, as shown in fig. 11, the luminance compensation apparatus 91 of a display panel in the luminance compensation system 900 of a display panel may further include a determining module 1101, a generating module 1102, and a storing module 1103.
A determining module 1101, configured to execute the brightness compensation method for the display panel shown in fig. 1 under a plurality of preset gray scales, and determine a target relationship curve between each preset gray scale and brightness;
a generating module 1102, configured to determine, based on a preset algorithm and a target relationship curve corresponding to each preset gray scale, a third brightness corresponding to each gray scale in all gray scales;
a determining module 1101, configured to generate a gray scale-brightness compensation curve according to all gray scales and the third brightness;
the storage module 1103 is configured to store the gray scale-luminance compensation curve into a storage module of the display panel, so as to perform luminance compensation through the gray scale-luminance compensation curve when the display panel displays a picture.
It should be noted that the brightness compensation system of the display panel provided in the embodiment of the present invention can be used to execute the brightness compensation method of the display panel provided in fig. 1 and fig. 8 in the embodiment of the present invention, and has corresponding functions and beneficial effects, which are not described in detail herein.
In accordance with the above-described embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (17)
1. A method for compensating brightness of a display panel, the method comprising:
calculating a first gray-scale value of a target display area according to a first brightness at a target position in the display area of the display panel and a second brightness of a pixel in the target display area, wherein the number of the pixel in the target display area is a first pixel number N1;
rounding the first gray scale value upwards to obtain a second gray scale value, and rounding the first gray scale value downwards to obtain a third gray scale value;
determining a second pixel number N2 corresponding to the second gray-scale value and a third pixel number N3 corresponding to the third gray-scale value when a target constraint condition is met according to the first gray-scale value, the second gray-scale value, the third gray-scale value and the first pixel number N1;
compensating the second brightness of the pixels in the target display area to the first brightness according to the second gray-scale value and the second number of pixels N2, the third gray-scale value and the third number of pixels N3;
the target constraint conditions are as follows: the difference absolute value of the gray scale sum of the first pixel and the gray scale sum of the second pixel in the target display area is minimum;
the first pixel gray-scale sum is the product of the first gray-scale value and the first pixel number N1; the second pixel gray scale sum is the sum of a first product and a second product, and the first product is the product of the second gray scale value and a first numerical value N2'; the second product is a product of the third gray-scale value and a second value N3 ', the sum of the first value N2 ' and the second value N3 ' is the first pixel number N1, the range of the first value N2 ' is [0, N1-N3 ' ], the range of the second value N3 ' is [0, N1-N2 ' ], and the sum of the second pixel number N2 and the third pixel number N3 is the first pixel number N1; n1, N2, N3, N2 'and N3' are all positive integers.
2. The method of claim 1, wherein the target position is a center position of the display area.
3. The method according to claim 1, wherein calculating the first gray-scale value of the target display area according to a first luminance at a target position in a display area of the display panel and a second luminance of a pixel in the target display area comprises:
and calculating a first gray-scale value of the target display area when the second brightness of each pixel in the target display area is compensated to the first brightness.
4. The method of claim 1, wherein prior to the calculating the first gray scale value for the target display region based on the first luminance at the target location in the display region of the display panel and the second luminance of the pixel in the target display region, the method further comprises:
and acquiring second brightness of the pixels in the target display area.
5. The method according to claim 4, wherein the obtaining the second brightness of the pixel in the target display area specifically comprises:
acquiring a target picture of the display area;
according to the position of each pixel in the pixel data corresponding to the target picture in the target picture, matching the position of each pixel in the display area;
and extracting second brightness corresponding to each pixel in the target display area according to the position of each pixel in the display area.
6. The method of claim 5, wherein the target picture is taken by a CCD camera.
7. The method according to claim 1, wherein the determining, according to the first gray-scale value, the second gray-scale value, the third gray-scale value, and the first pixel number N1, a second pixel number N2 corresponding to the second gray-scale value and a third pixel number N3 corresponding to the third gray-scale value when a target constraint condition is satisfied specifically includes:
respectively calculating the absolute value of the difference corresponding to each value of the first numerical value N2 ', N2' epsilon (0, N1);
comparing the magnitude of the plurality of difference absolute values to obtain the minimum difference absolute value in the plurality of difference absolute values;
and determining the value of N2' corresponding to the minimum difference absolute value as the value of N2 of the second pixel number, and determining the value of N1-N2 as the value of N3 of the third pixel number.
8. The method of claim 1, wherein the pixels in the target display area are distributed in a M1 XM 2 distribution, wherein M1 XM 2 is N1, and M1 and M2 are all positive integers.
9. The method of claim 8, wherein M1 and M2 are equal.
10. The method of any of claims 1-9, wherein the compensating the second luminance of the pixels in the target display area to the first luminance according to the second gray scale value and the second number of pixels N2, the third gray scale value and the third number of pixels N3 comprises:
and compensating the second brightness of the pixels in the target display area to the first brightness in a mode of uniformly distributing the second gray-scale value and the third gray-scale value in the target display area.
11. The method of claim 10, wherein compensating the second luminance of the pixels in the target display area to the first luminance in a manner that the second and third gray scale values are uniformly distributed in the target display area comprises:
and compensating the second brightness of the pixels in the target display area to the first brightness in a mode of inserting at least one third gray scale value distribution between the two second gray scale values.
12. The method according to claim 11, wherein the compensating the second luminance of the pixels in the target display area to the first luminance in a manner of interleaving at least one third distribution of gray scale values between two of the second gray scale values comprises:
and compensating the second brightness of the pixels in the target display area to the first brightness in a mode that the gray-scale values of the pixels in the odd-numbered rows are the second gray-scale values and the gray-scale values of the pixels in the even-numbered rows are the third gray-scale value distribution.
13. A method for compensating brightness of a display panel, comprising:
executing the brightness compensation method of the display panel according to any one of claims 1 to 12 at a plurality of preset gray scales to determine a target relationship curve between each preset gray scale and brightness;
determining a third brightness corresponding to each gray scale in all gray scales based on a preset algorithm and a target relation curve corresponding to each preset gray scale;
generating a gray scale-brightness compensation curve according to the all gray scales and the third brightness;
and storing the gray scale-brightness compensation curve into a storage module of a display panel so as to carry out brightness compensation through the gray scale-brightness compensation curve when the display panel displays a picture.
14. The method of claim 13, wherein the predetermined gray levels comprise at least a first gray level, a second gray level, and a third gray level; the value ranges of the first gray scale, the second gray scale and the third gray scale are all 0 gray scale to 255 gray scale.
15. The method of claim 13 or 14, wherein the memory module comprises a driver IC.
16. A brightness compensation system for a display panel, the brightness compensation system comprising: a brightness compensation device of a display panel and the display panel;
the brightness compensation apparatus of the display panel includes:
the calculation module is used for calculating a first gray-scale value of a target display area according to a first brightness at a target position in the display area of the display panel and a second brightness of pixels in the target display area, wherein the number of the pixels in the target display area is a first pixel number N1;
the rounding module is used for rounding the first gray value upwards to obtain a second gray value, and rounding the first gray value downwards to obtain a third gray value;
a determining module, configured to determine, according to the first gray scale value, the second gray scale value, the third gray scale value, and the first pixel number N1, a second pixel number N2 corresponding to the second gray scale value and a third pixel number N3 corresponding to the third gray scale value when a target constraint condition is satisfied;
a compensation module, configured to compensate the second luminance of the pixel in the target display area to the first luminance according to the second gray scale value and the second number of pixels N2, the third gray scale value and the third number of pixels N3;
the target constraint conditions are as follows: the difference absolute value of the gray scale sum of the first pixel and the gray scale sum of the second pixel in the target display area is minimum;
the first pixel gray-scale sum is the product of the first gray-scale value and the first pixel number N1; the second pixel gray scale sum is the sum of a first product and a second product, and the first product is the product of the second gray scale value and a first numerical value N2'; the second product is a product of the third gray-scale value and a second value N3 ', the sum of the first value N2 ' and the second value N3 ' is the first pixel number N1, the range of the first value N2 ' is [0, N1-N3 ' ], the range of the second value N3 ' is [0, N1-N2 ' ], and the sum of the second pixel number N2 and the third pixel number N3 is the first pixel number N1; n1, N2, N3, N2 'and N3' are all positive integers.
17. The system of claim 16, further comprising a charge coupled device camera;
the CCD camera is used for shooting a target picture corresponding to the display area of the display panel.
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