CN114267279A - Method, device and equipment for determining compensation gray scale - Google Patents
Method, device and equipment for determining compensation gray scale Download PDFInfo
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Abstract
The application provides a compensation gray scale determination method, a compensation gray scale determination device and compensation gray scale determination equipment. The method comprises the following steps: displaying a calibration picture in a test area of the display panel, wherein the test area comprises a first sub-area and a second sub-area, the calibration picture comprises a first picture and a second picture, the gray scale value of the first picture is a first gray scale value, the gray scale value of the second picture is a second gray scale value, the first sub-area displays the first picture, and the second sub-area displays the second picture; acquiring first brightness of the first sub-area and second brightness of the second sub-area; determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness and the second brightness; and determining a compensation gray-scale value of the sub-pixel of the display panel under the first gray-scale value according to the calibration gamma value. According to the embodiment of the application, the problem of poor compensation effect of the display panel can be improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a compensation gray scale determination method, device and equipment.
Background
The display panel may have a Mura phenomenon during a display process, which affects a display effect of the display panel. In order to avoid the Mura phenomenon, the display panel may be subjected to Demura compensation.
In the process of carrying out the Demura compensation to display panel, can adopt luminance collection equipment to gather display panel's luminance data, however, because luminance collection equipment's uniformity and stability have a problem, the luminance data that leads to luminance collection equipment to gather is not accurate enough, and then leads to carrying out the Demura compensation according to the luminance data that luminance collection equipment gathered after, display panel still has the relatively poor problem of compensation effect.
Disclosure of Invention
The embodiment of the application provides a compensation gray scale determining method, device and equipment, which can solve the problem of poor compensation effect of a display panel.
In a first aspect, an embodiment of the present application provides a compensation gray level determining method, which includes: displaying a calibration picture in a test area of the display panel, wherein the test area comprises a first sub-area and a second sub-area, the calibration picture comprises a first picture and a second picture, the gray scale value of the first picture is a first gray scale value, the gray scale value of the second picture is a second gray scale value, the first sub-area displays the first picture, and the second sub-area displays the second picture; acquiring first brightness of the first sub-area and second brightness of the second sub-area; determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness and the second brightness; and determining a compensation gray-scale value of the sub-pixel of the display panel under the first gray-scale value according to the calibration gamma value.
In a possible implementation manner of the first aspect, the number of the first sub-area and the second sub-area is multiple, and the multiple first sub-areas and the multiple second sub-areas are alternately distributed in the first direction and the second direction which intersect each other.
In a possible implementation manner of the first aspect, the first sub-area and the second sub-area are both rectangular areas, the lengths of the first sub-area and the second sub-area in the first direction are equal, and the widths of the first sub-area and the second sub-area in the second direction are equal.
In a possible implementation manner of the first aspect, the number of the first sub-area and the second sub-area is multiple, and before determining the calibration gamma value according to the first brightness and the second brightness, the method further includes:
calculating a first brightness mean value of a plurality of first sub-areas and a second brightness mean value of a plurality of second sub-areas;
determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness and the second brightness, including:
and determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness mean value and the second brightness mean value.
In a possible implementation manner of the first aspect, determining, according to the first luminance average value and the second luminance average value, a calibration gamma value corresponding to the first gray-scale value includes:
determining a calibration gamma value according to the following expression:
wherein, GammaratioRepresenting a calibration gamma value, N1 representing a first gray level value, N2 representing a second gray level value, Ln1Represents the first luminance mean value, Ln2Representing the second luminance mean value.
In a possible implementation manner of the first aspect, determining a compensated gray-scale value of a sub-pixel of the display panel at a first gray-scale value according to the calibration gamma value includes:
determining a compensated gray scale value according to the following expression:
wherein N isxRepresenting the compensated gray level, N1 representing the first gray level, LaverIndicating a target brightness value, L, corresponding to the first gray level value1Representing the collected brightness value, Gamma, of the sub-pixel of the display panel at the first gray levelratioRepresenting the calibration gamma value.
In a possible implementation manner of the first aspect, before determining the compensated gray-scale value at the first gray-scale value of the sub-pixel of the display panel according to the calibration gamma value, the method further includes:
determining the collected brightness value of the sub-pixel in the second sub-area under the first gray-scale value according to the following expression:
wherein L is1Representing the collected luminance value, L, of the sub-pixels in the second sub-area at the first gray level2Representing the collected brightness value of the sub-pixel in the second sub-region at the second gray scale value, N1 representing the first gray scale value, N2 representing the first gray scale value, GammaratioRepresenting the calibration gamma value.
In a possible implementation manner of the first aspect, before the calibration screen is displayed in the test area of the display panel, the method further includes:
acquiring brightness data of sub-pixels in at least part of display areas of a display panel under a first picture;
determining a brightness difference range according to the brightness data of at least partial sub-pixels in the display area under the first picture;
and determining a second gray-scale value according to the brightness difference range, wherein the first ratio is larger than or equal to the maximum value of the brightness difference range, the first ratio is the ratio of the first difference to the brightness mean value of at least part of the display area, and the first difference is the difference between the brightness value corresponding to the second gray-scale value on the preset gamma curve and the brightness mean value of at least part of the display area.
In a possible implementation manner of the first aspect, the determining the calibration gamma value according to the first brightness and the second brightness includes:
and determining calibration gamma values corresponding to the sub-pixels of the colors respectively according to the first brightness and the second brightness.
In a second aspect, an embodiment of the present application further provides a compensation gray level determining apparatus, including:
the display enabling module is used for displaying a calibration picture in a test area of the display panel, the test area comprises a first sub-area and a second sub-area which are alternately distributed, the calibration picture comprises a first picture and a second picture, the gray scale value of the first picture is a first gray scale value, the gray scale value of the second picture is a second gray scale value, the first sub-area displays the first picture, and the second sub-area displays the second picture;
the brightness acquisition module is used for acquiring first brightness of the first sub-area and second brightness of the second sub-area;
the calibration gamma determining module is used for determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness and the second brightness;
and the compensation gray scale determining module is used for determining the compensation gray scale value of the sub-pixel of the display panel under the first gray scale value according to the calibration gamma value.
In a third aspect, an embodiment of the present application provides a compensation gray scale determining apparatus, including: the electronic device comprises a processor, a memory and a program or instructions stored on the memory and executable on the processor, which when executed by the processor implements the steps of the compensated gray level determination method according to the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the compensation gray level determination method according to the first aspect.
According to the embodiment of the application, the compensation value is not limited to be determined by using the preset known gamma value, but the calibration gamma value embodied by the collected brightness data is determined according to the collected actual brightness information, and the compensation gray-scale value is further determined according to the calibration gamma value. Specifically, a calibration picture is displayed in the test area, the test area is divided into a first sub-area and a second sub-area which are alternately distributed, the first sub-area displays a first picture with a gray scale value as a first gray scale value, the second sub-area displays a second picture with a gray scale value as a second gray scale value, and because the gray scale pictures displayed by the first sub-area and the second sub-area are different, the brightness change of the first sub-area and the second sub-area can represent the change relation of the brightness along with the gray scale, namely, the calibration gamma value represented by the collected brightness data can be determined according to the brightness of the first sub-area and the second sub-area. The compensation value of the sub-pixel under the first gray-scale value is determined based on the brightness value and the gamma value of the sub-pixel under the first gray-scale value, the compensation gray-scale value is not determined simply by directly using a preset known gamma value, but the compensation gray-scale value is determined by using the calibration gamma value embodied by the collected brightness data, so that errors caused by instability and poor consistency of the brightness collecting equipment can be reduced or compensated, and the problem of poor compensation effect of the display panel is solved.
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Other features, objects, and advantages of the present application 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 schematic diagram illustrating luminance curves of color sub-pixels in a row of pixel units of a display panel according to an embodiment of the present application;
FIG. 2 is a flow chart illustrating a compensation gray level determination method according to an embodiment of the present application;
FIG. 3 illustrates a display schematic of a test zone provided in accordance with one embodiment of the present application;
FIG. 4 illustrates a display schematic of a test zone provided in accordance with another embodiment of the present application;
FIG. 5 is a flow chart illustrating a compensation gray level determination method according to another embodiment of the present application;
FIG. 6 is a flow chart illustrating a compensation gray level determination method according to another embodiment of the present application;
FIG. 7 is a schematic structural diagram of a compensated gray level determination apparatus according to an embodiment of the present application;
FIG. 8 is a schematic structural diagram of a compensated gray scale determining apparatus according to an embodiment of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application 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 present application and are not intended to limit the present application. It will be apparent to one skilled in the art that the present application 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 application by illustrating examples thereof.
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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Before explaining the technical solutions provided by the embodiments of the present application, in order to facilitate understanding of the embodiments of the present application, the present application first specifically explains the problems existing in the prior art:
demura compensation requires collecting the brightness of a display panel with a brightness collection device and then determining a compensation gray scale value according to the collected brightness. However, if the uniformity and stability of the brightness acquiring device are not good enough, the brightness difference acquired by the brightness acquiring device may deviate from the actual brightness difference of the sub-pixels of the display panel, which may result in poor compensation effect.
Illustratively, taking the display panel including red, green and blue sub-pixels as an example, referring to fig. 1, the abscissa in fig. 1 represents the column position of the sub-pixels, and the abscissa represents the ratio of the collected luminance of the sub-pixels at a certain column position to the average value of the collected luminance of the sub-pixels at the row. Due to the inaccuracy of the luminance data collected by the luminance collecting device, as shown in fig. 1, the difference between the luminance data of the red sub-pixel, the green sub-pixel and the blue sub-pixel at some column positions collected by the luminance collecting device and the average value of the collected luminance of the sub-pixel at the row is large, and actually, the luminance data of the red sub-pixel, the green sub-pixel and the blue sub-pixel at the same row are relatively flat, and the problem that the difference between the luminance data at some positions shown in fig. 1 is large should not exist. For example, the actual maximum brightness difference of the sub-pixels is 8%, and the maximum brightness difference of the sub-pixels collected by the brightness collecting device may be 9%, 10% or more due to instability and poor consistency of the brightness collecting device, so that the gamma value represented by the brightness data collected by the brightness collecting device may not be consistent with the preset known gamma (gamma) value.
In the process of Demura compensation of the display panel, a preset known gamma value and brightness data collected by the brightness collection device are usually used to determine a compensation gray scale, however, because the gamma value reflected by the brightness data collected by the brightness collection device is inconsistent with the preset known gamma value, the compensated display effect is still not ideal, and even the compensated display effect is worse.
In view of the above-mentioned technical problems, embodiments of the present application provide a compensation gray scale determining method, a compensation gray scale determining device, a compensation gray scale determining apparatus, and a computer-readable storage medium, and embodiments of the compensation gray scale determining method, the compensation gray scale determining device, the compensation gray scale determining apparatus, and the computer-readable storage medium will be described below with reference to the accompanying drawings.
An embodiment of the present application provides a compensation gray scale determining method, which is used to determine a compensation gray scale value of a display panel, where the display panel may be an Organic Light Emitting Diode (OLED) display panel, and in other implementation manners of the present application, the display panel may also be a liquid crystal display panel, a Micro LED display panel, a quantum dot display panel, and the like, and the present application does not limit the present application. The display panel of the embodiments of the present application may be presented in various forms, some examples of which will be described below.
The gray scale compensation method provided by the embodiment of the application can be executed by a gray scale compensation device. As shown in fig. 2, the compensation gray level determining method according to the embodiment of the present application includes steps S210 to S240.
Step S210, displaying a calibration frame in a test area of the display panel, where the test area includes a first sub-area and a second sub-area that are alternately distributed, the calibration frame includes a first frame and a second frame, a gray scale value of the first frame is a first gray scale value, a gray scale value of the second frame is a second gray scale value, the first sub-area displays the first frame, and the second sub-area displays the second frame.
Step S220, a first luminance of the first sub-area and a second luminance of the second sub-area are collected.
In step S230, a calibration gamma value corresponding to the first gray scale value is determined according to the first brightness and the second brightness.
In step S240, a compensation gray-scale value of the sub-pixel of the display panel at the first gray-scale value is determined according to the calibration gamma value.
The compensation gray scale determining method provided by the embodiment of the application is not limited to determining the compensation value by using the preset known gamma value, but determines the calibration gamma value embodied by the collected brightness data according to the collected actual brightness information, and further determines the compensation gray scale value according to the calibration gamma value. Specifically, a calibration picture is displayed in the test area, the test area is divided into a first sub-area and a second sub-area which are alternately distributed, the first sub-area displays a first picture with a gray scale value as a first gray scale value, the second sub-area displays a second picture with a gray scale value as a second gray scale value, and because the gray scale pictures displayed by the first sub-area and the second sub-area are different, the brightness change of the first sub-area and the second sub-area can represent the change relation of the brightness along with the gray scale, namely, the calibration gamma value represented by the collected brightness data can be determined according to the brightness of the first sub-area and the second sub-area. The compensation value of the sub-pixel under the first gray-scale value is determined based on the brightness value and the gamma value of the sub-pixel under the first gray-scale value, the compensation gray-scale value is not determined simply by directly using a preset known gamma value, but the compensation gray-scale value is determined by using the calibration gamma value embodied by the collected brightness data, so that errors caused by instability and poor consistency of the brightness collecting equipment can be reduced or compensated, and the problem of poor compensation effect of the display panel is solved.
For example, the first sub-region and the second sub-region may each include a plurality of sub-pixels, the first luminance may be an average luminance value of the plurality of sub-pixels of the first sub-region at a first gray scale value, and the second luminance may be an average luminance value of the plurality of sub-pixels of the second sub-region at a second gray scale value.
For example, in the case that the luminance acquisition device can acquire the luminance of a single sub-pixel, step S220 may specifically include: acquiring the brightness of the plurality of sub-pixels of the first sub-area corresponding to each other under a first gray-scale value, and calculating the average brightness of the plurality of sub-pixels of the first sub-area under the first gray-scale value to obtain the first brightness of the first sub-area; and acquiring the brightness of the plurality of sub-pixels of the second sub-area under the second gray scale value, and calculating the average brightness of the plurality of sub-pixels of the second sub-area under the second gray scale value to obtain the second brightness of the second sub-area.
For example, in a case that the luminance collecting device can directly collect the luminance mean value of the first sub-area and the second sub-area, the luminance collecting device can be used to directly collect the first luminance of the first sub-area and the second luminance of the second sub-area.
It is understood that the display panel 100 includes a display area AA as shown in fig. 3 or 4. For example, as shown in fig. 3, the test area AC may be a partial area of the display area AA, that is, in step S210, only the partial area of the display area AA may be lighted up as the test area AC. For another example, as shown in fig. 4, the entire display area AA may be used as the test area AC, that is, in step S210, the entire area of the display area AA may be lit up to be used as the test area AC.
The number of the first sub-area a11 and the second sub-area a12 is not limited in the embodiments of the present application, for example, as shown in fig. 3, the number of the first sub-area a11 and the second sub-area a12 may be only one, or as shown in fig. 4, the number of the first sub-area a11 and the second sub-area a12 are both plural.
It will be appreciated that in the case that the first sub-zone a11 and the second sub-zone a12 are only one, the first sub-zone a11 and the second sub-zone a12 may be adjacently distributed in only one direction.
In some alternative embodiments, in the case that the number of the first sub-area a11 and the second sub-area a12 is plural, the first sub-area a11 and the second sub-area a12 may be alternately distributed in the first direction X and the second direction Y, and the first direction X and the second direction Y intersect. For example, the first direction X may be a row direction and the second direction Y may be a column direction.
By arranging the plurality of first sub-areas a11 and the plurality of second sub-areas a12 to be alternately distributed, the first sub-area a11 displays a first picture with a gray scale value of a first gray scale value, the second sub-area a12 displays a second picture with a gray scale value of a second gray scale value, and the plurality of first sub-areas a11 and the plurality of second sub-areas a12 constitute a checkerboard-format picture. It can be understood that the first gray scale value and the second gray scale value are different, so that the high and low gray scales in the checkerboard-type picture formed by the plurality of first sub-regions a11 and the plurality of second sub-regions a12 are interspersed, and the uniformity of the displayed picture can be ensured, thereby facilitating the accuracy of the calibration gamma value obtained by using the brightness of the high and low gray scale pictures in the checkerboard-type picture in the subsequent step.
For example, the shape of the first sub-region a11 and the second sub-region a12 may not be limited in the embodiments of the present application, for example, the shape of the first sub-region a11 and the second sub-region a12 may be a rectangle, a regular pentagon, a regular hexagon, or the like.
For example, the plurality of first sub-regions a11 may have the same rectangular shape, and the plurality of second sub-regions a12 may have the same rectangular shape. In some alternative embodiments, the first sub-area a11 and the second sub-area a12 may be both rectangular in shape, and the first sub-area a11 and the second sub-area a12 have equal lengths in the first direction, and the first sub-area a11 and the second sub-area a12 have equal widths in the first direction. By dividing the display area of the display panel into a plurality of first sub-areas A11 and a plurality of second sub-areas A12 which are rectangular and are arranged in an array and in an alternating manner, on one hand, the uniformity of the display picture can be further ensured, thereby further contributing to the accuracy of the calibration gamma value obtained by utilizing the brightness of high and low gray level pictures in the checkerboard format pictures in the subsequent steps; on the other hand, it is possible to facilitate the acquisition of the brightness of the first sub-area a11 and the second sub-area a 12.
For example, the area of the first sub-zone a11 and the second sub-zone a12 may not be limited in the embodiments of the present application. For example, in order to facilitate the subsequent acquisition of the luminance of the plurality of first sub-regions a11 and the plurality of second sub-regions a12, the first sub-region a11 and the second sub-region a12 may include a plurality of rows and a plurality of columns of pixel units, and the pixel units may include sub-pixels of a plurality of colors.
It is understood that the first and second gray scale values are different. For example, the first and second gray scale values may be any gray scale values that can be displayed by the display panel. For example, the display panel can display gray scales ranging from 0 to 255, and the first gray scale value and the second gray scale value can be any one of 0 to 255. For example, in the process of determining the compensation gray scale of the display panel, some compensation gray scales under the designated gray scale binding point may be determined first, and then the compensation gray scale corresponding to the gray scale other than the gray scale binding point may be determined by using a linear interpolation method. Specifically, the first gray scale value may be any one of 32 gray scales, 64 gray scales, 96 gray scales, 128 gray scales, 160 gray scales, 192 gray scales, 224 gray scales, and 255 gray scales. After determining the first gray scale value, the second gray scale value may be set empirically. For example, the absolute value of the difference between the first gray scale value and the second gray scale value may be greater than or equal to a first threshold value and less than or equal to a second threshold value, for example, the first threshold value is 10 and the second threshold value is 20. For example, in the case where the first gray level value is equal to 224 gray levels, the second gray level value may be equal to 240 gray levels.
In some optional embodiments, as shown in fig. 5, before step S210, the compensation gray scale determining method provided in the embodiment of the present application may further include step S510 to step S530.
Step S510, collecting luminance data of sub-pixels in at least a part of the display area of the display panel under the first frame.
In step S520, a brightness difference range is determined according to the brightness data of at least some of the sub-pixels in the display area in the first frame.
Step S530, determining a second gray-scale value according to the brightness difference range, so that the first ratio is greater than or equal to a maximum value of the brightness difference range, the first ratio is a ratio of the first difference to a brightness mean value of at least a portion of the display area, and the first difference is a difference between a brightness value corresponding to the second gray-scale value on the preset gamma curve and the brightness mean value of at least a portion of the display area.
In step S510, at least a portion of the display area of the display panel may be caused to display a first screen. For example, a certain line or a certain adjacent multiple lines of display areas of the display panel may display the first picture, or the display panel is an off-screen camera display panel, and includes a main screen area and an auxiliary screen area, and the auxiliary screen area is correspondingly provided with a camera, and the auxiliary screen area of the display panel may display the first picture.
Illustratively, the display panel may include subpixels of a plurality of colors. For example, the display panel may include red, green, and blue sub-pixels. Taking the red sub-pixel as an example, in step S510, luminance data of each red sub-pixel in at least a portion of the display area in the first frame may be collected. In step S520, the brightness mean of the collected red sub-pixels in at least a portion of the display area may be calculated, and then the ratio of the brightness of each red sub-pixel to the brightness mean of the red sub-pixels is calculated, where the maximum ratio and the minimum ratio in the ratios corresponding to each red sub-pixel constitute the brightness difference range corresponding to the red sub-pixel.
The gray level of the first frame is a first gray level, and the average luminance value of the red sub-pixels can be used as the luminance value corresponding to the first gray level. In step S530, a preset known gamma value may be used to determine a second gray level value, and in the case that the gamma value is known, a gamma curve is considered to be known, and the gamma curve is a corresponding relationship between gray levels and brightness. Therefore, in step S530, the brightness value corresponding to the first gray scale value may be multiplied by the maximum value in the brightness difference range to obtain a maximum brightness value, and then the maximum gray scale value corresponding to the maximum brightness value is found on the preset known gamma curve, and the second gray scale value may be set to be greater than or equal to the maximum gray scale value. Since the second gray level value is greater than or equal to the maximum brightness value, it can be understood that the brightness difference between the second gray level value and the first gray level value can cover the brightness error caused by the instability of the brightness acquisition device, so that the accuracy of the subsequent calibration gamma value can be ensured.
The red sub-pixel is taken as an example to describe the determining manner of the second gray-scale value, and the determining manner of the second gray-scale values corresponding to the sub-pixels of other colors may refer to the red sub-pixel, which is not described in detail herein.
For example, in step S510, luminance data of sub-pixels in at least a portion of the display area of the display panel in the first frame may be acquired by using a luminance acquisition device. Of course, in step S220, the brightness of the first sub-region and the brightness of the second sub-region may also be acquired by using a brightness acquisition device, and for convenience of distinction, the brightness of the first sub-region is referred to as a first brightness, and the brightness of the second sub-region is referred to as a second brightness. Illustratively, the brightness acquisition Device may be a color analyzer, or a high resolution and high precision camera such as a Charge Coupled Device (CCD) camera, or the like.
In some alternative embodiments, the display panel may include subpixels of multiple colors, as described above. For example, the display panel may include red, green, and blue sub-pixels. Calibration gamma values corresponding to the sub-pixels of each color and compensation gray-scale values of the sub-pixels of each color at the first gray-scale value can be respectively determined. It is understood that, for any color of sub-pixels, it is necessary to make the test area display the test frame corresponding to the color, and therefore, the first frame may include a first frame corresponding to each color of sub-pixel, and the second gray scale frame may include a second frame corresponding to each color of sub-pixel. For example, the first frame may include a red frame, a green frame, and a blue frame with a first gray scale value, and the second frame may include a red frame, a green frame, and a blue frame with a second gray scale value. The calibration gamma value and the compensation gray-scale value corresponding to the sub-pixel of each color can be respectively determined, so in step S210, the calibration picture corresponding to the sub-pixel of each color can be respectively displayed in the test area of the display panel, and in step S220, the brightness of the first sub-area and the second sub-area under the calibration picture corresponding to the sub-pixel of each color is respectively collected. Correspondingly, step S230 may specifically include: and determining calibration gamma values corresponding to the sub-pixels of the colors respectively according to the first brightness and the second brightness. Therefore, the calibration gamma value corresponding to the sub-pixel of each color under the first gray scale value can be respectively determined, the same calibration gamma value is prevented from being used by a plurality of colors, and the accuracy of the compensation gray scale value of the sub-pixel of each color under the first gray scale value is improved. In some optional embodiments, still taking the number of the first sub-area and the second sub-area as a plurality, as shown in fig. 6, before step S230, the compensation gray scale determining method provided in the embodiment of the present application may further include step S610.
In step S610, a first luminance mean value of the plurality of first sub-regions and a second luminance mean value of the plurality of second sub-regions are calculated.
Correspondingly, step S230 may specifically include: and determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness mean value and the second brightness mean value.
For example, the number of the first sub-region and the second sub-region is 10, taking red sub-pixels as an example, and the number of the red sub-pixels in the first sub-region and the second sub-region is 100, in the case that the luminance acquisition device can acquire the luminance of a single sub-pixel, the first luminance mean value may be a ratio of the sum of the luminances of the red sub-pixels in 1000 first sub-regions to 1000, and the second luminance mean value may be a ratio of the sum of the luminances of the red sub-pixels in 1000 second sub-regions to 1000. In the case that the luminance average values of the first sub-area and the second sub-area can be directly acquired by the luminance acquisition device, the first luminance average value may be a ratio of the sum of the 10 first sub-area luminance average values to 10, and the second luminance average value may be a ratio of the sum of the 10 second sub-area luminance average values to 10.
In the embodiment of the application, the calibration gamma value is determined through the brightness mean value, so that the obtained calibration gamma value is more accurate.
In some optional embodiments, taking the number of the first sub-area and the second sub-area as a plurality, step S230 may specifically include: determining a calibration gamma value according to the following expression (1):
wherein, GammaratioRepresenting a calibration gamma value, N1 representing a first gray level value, N2 representing a second gray level value, Ln1A first luminance mean value, L, representing a plurality of first sub-regionsn2Representing a second luminance mean value of a plurality of second sub-regions.
For example, different values of the first gray level value may correspond to different calibration gamma values. In addition, as described above, different values of the first gray scale value may correspond to different values of the second gray scale value. For example, the first gray scale value may be 224 gray scales, and the corresponding second gray scale value may be 240 gray scales; for another example, the first gray scale value may be 96 gray scales, and the corresponding second gray scale value may be 112 gray scales.
The gamma curve can be understood as the relationship between the brightness and the gray scale, for example, if the display panel is an 8-bit panel, the maximum gray scale value of the display panel is 255, the first gray scale value N1 and the first brightness average value Ln1The second gray-scale value N2 and the second luminance mean value 2 satisfy the relation (1.1):
wherein L ismaxIndicating a luminance value at a gray scale value of 255.
Formula (1.3) is obtained by dividing formula (1.1) by formula (1.2):
the expression (1) can be obtained by further using the expression (1.3).
In the embodiment of the application, the calibration gamma value is directly calculated according to the formula (1), so that the accuracy and the calculation efficiency can be improved.
In some optional embodiments, before step S240, the compensation gray level determining method provided in the embodiment of the present application may further include: determining a collected luminance value of the sub-pixel in the second sub-area at the first gray-scale value according to the following expression (2):
wherein L is21Representing the collected luminance value, L, of the sub-pixels in the second sub-area at the first gray level2Representing the collected brightness value of the sub-pixel in the second sub-region at the second gray scale value, N1 representing the first gray scale value, N2 representing the second gray scale value, GammaratioRepresenting the calibration gamma value.
When determining the compensation gray-scale value of the sub-pixel under the first gray-scale value, the compensation gray-scale values corresponding to the sub-pixels in the first sub-area and the second sub-area need to be determined. Since the first sub-region displays the first frame with the first gray scale value in step S210, in the case that the luminance of a single sub-pixel can be acquired by the luminance acquiring device, the acquired luminance value of each sub-pixel in the first sub-region at the first gray scale value can be directly acquired in step S220. In step S210, the second sub-area displays the second image with the second gray scale value, in this embodiment, the collected luminance value of the sub-pixel in the second sub-area under the first gray scale value can be determined directly through the expression (2), and it is not necessary to make the second sub-area display the second image with the first gray scale valueThe first picture of the gray scale value does not need to acquire the brightness data of the second sub-area under the first picture, and the efficiency can be improved. In addition, in the embodiment of the present application, the calibration Gamma value Gamma is embodied by the collected brightness dataratioThe acquisition brightness values of the sub-pixels in the second sub-area under the first gray-scale value are determined, and the accuracy of the determined acquisition brightness values of the sub-pixels in the second sub-area under the first gray-scale value is further ensured.
In some optional embodiments, step S240 may specifically include: determining a compensated gray scale value according to the following expression (3):
wherein N isxRepresenting the compensated gray level, N1 representing the first gray level, LaverIndicating a target brightness value, L, corresponding to the first gray level value1Representing the collected brightness value, Gamma, of the sub-pixel of the display panel at the first gray levelratioRepresenting the calibration gamma value.
The sub-pixels may include a sub-pixel located in the first sub-region and a sub-pixel located in the second sub-region, and if the sub-pixel is the sub-pixel located in the first sub-region, L1The collected brightness values of the sub-pixels in the first sub-area under the first gray scale value can be directly obtained in step S220; if the sub-pixel is located in the second sub-area, L1May be equal to L determined by the above expression (2)21。
Illustratively, the target luminance value L corresponding to the first gray scale value may be set directly empiricallyaverThe average brightness value of the plurality of first sub-regions at the first gray scale value may also be used as the target brightness value L corresponding to the first gray scale valueaverThe average brightness value of the first sub-regions and the second sub-regions at the first gray scale value can also be used as the target brightness value L corresponding to the first gray scale valueaverThis is not a limitation of the present application.
According to the above formula (3), the required compensation gray scale value can be accurately obtained.
In some optional embodiments, after step S240, the compensation gray level determining method provided in the embodiment of the present application may further include: and storing the compensated gray-scale value into a storage module of the display panel. Therefore, the display panel can directly call the pre-stored compensation gray-scale value in the actual display process, and the compensation efficiency can be improved.
FIG. 7 is a schematic structural diagram of a compensated gray level determining apparatus according to an embodiment of the present application. As shown in fig. 7, the compensation gray level determining apparatus 700 provided in the embodiment of the present application includes a display enabling module 701, a brightness acquiring module 702, a calibration gamma determining module 703, and a compensation gray level determining module 704.
The display enabling module 701 is configured to display a calibration picture in a test area of the display panel, where the test area includes a first sub-area and a second sub-area that are alternately distributed, the calibration picture includes a first picture and a second picture, a gray scale value of the first picture is a first gray scale value, a gray scale value of the second picture is a second gray scale value, the first sub-area displays the first picture, and the second sub-area displays the second picture;
a brightness acquisition module 702, configured to acquire a first brightness of the first sub-area and a second brightness of the second sub-area;
a calibration gamma determining module 703, configured to determine a calibration gamma value corresponding to the first gray-scale value according to the first brightness and the second brightness;
the compensation gray level determining module 704 is configured to determine a compensation gray level value of the sub-pixel of the display panel at the first gray level value according to the calibration gamma value.
According to the compensation gray scale determining device provided by the embodiment of the application, the compensation value is not limited to be determined by using the preset known gamma value, but the calibration gamma value embodied by the collected brightness data is determined according to the collected actual brightness information, and the compensation gray scale value is further determined according to the calibration gamma value. Specifically, a calibration picture is displayed in the test area, the test area is divided into a first sub-area and a second sub-area which are alternately distributed, the first sub-area displays a first picture with a gray scale value as a first gray scale value, the second sub-area displays a second picture with a gray scale value as a second gray scale value, and because the gray scale pictures displayed by the first sub-area and the second sub-area are different, the brightness change of the first sub-area and the second sub-area can represent the change relation of the brightness along with the gray scale, namely, the calibration gamma value represented by the collected brightness data can be determined according to the brightness of the first sub-area and the second sub-area. The compensation value of the sub-pixel under the first gray-scale value is determined based on the brightness value and the gamma value of the sub-pixel under the first gray-scale value, the compensation gray-scale value is not determined simply by directly using a preset known gamma value, but the compensation gray-scale value is determined by using the calibration gamma value embodied by the collected brightness data, so that errors caused by instability and poor consistency of the brightness collecting equipment can be reduced or compensated, and the problem of poor compensation effect of the display panel is solved.
In some optional embodiments, the number of the first sub-area and the second sub-area is multiple, and the multiple first sub-areas and the multiple second sub-areas are alternately distributed in the first direction and the second direction which intersect.
In some optional embodiments, the first sub-region and the second sub-region are both rectangular regions, and the length of the first sub-region and the length of the second sub-region in the first direction are equal, and the width of the first sub-region and the width of the second sub-region in the second direction are equal.
In some optional embodiments, the number of the first sub-region and the second sub-region is multiple, and the calibration gamma determining module 703 is specifically configured to:
calculating a first brightness mean value of a plurality of first sub-areas and a second brightness mean value of a plurality of second sub-areas;
and determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness mean value and the second brightness mean value.
In some optional embodiments, the calibration gamma determination module 703 is specifically configured to:
determining a calibration gamma value according to the following expression:
wherein, GammaratioRepresenting a calibration gamma value, N1 representing a first gray level value, N2 representing a second gray level value, Ln1Represents the first luminance mean value, Ln2Representing the second luminance mean value.
In some alternative embodiments, the compensated gray level determination module 704 is specifically configured to:
determining a compensated gray scale value according to the following expression:
wherein N isxRepresenting the compensated gray level, N1 representing the first gray level, LaverIndicating a target brightness value, L, corresponding to the first gray level value1Representing the collected brightness value, Gamma, of the sub-pixel of the display panel at the first gray levelratioRepresenting the calibration gamma value.
In some alternative embodiments, the compensated gray level determination module 704 may be further configured to:
determining the collected brightness value of the sub-pixel in the second sub-area under the first gray-scale value according to the following expression:
wherein L is21Representing the collected luminance value, L, of the sub-pixels in the second sub-area at the first gray level2Representing the collected brightness value of the sub-pixel in the second sub-region at the second gray scale value, N1 representing the first gray scale value, N2 representing the first gray scale value, GammaratioRepresenting the calibration gamma value.
In some optional embodiments, the brightness acquisition module 702 may also be configured to:
acquiring brightness data of sub-pixels in at least part of display areas of a display panel under a first picture;
determining a brightness difference range according to the brightness data of at least partial sub-pixels in the display area under the first picture;
and determining a second gray-scale value according to the brightness difference range, wherein the first ratio is larger than or equal to the maximum value of the brightness difference range, the first ratio is the ratio of the first difference to the brightness mean value of at least part of the display area, and the first difference is the difference between the brightness value corresponding to the second gray-scale value on the preset gamma curve and the brightness mean value of at least part of the display area.
In some optional embodiments, the compensation gray level determining apparatus 700 provided in the embodiment of the present application may further include a pre-storing module. The pre-storage module is used for storing the compensation gray-scale value into a storage module of the display panel.
The compensation gray scale determining device in the embodiment of the present application may be a device, or may be a component, an integrated circuit, or a chip in a terminal. The device can be mobile electronic equipment or non-mobile electronic equipment. By way of example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile electronic device may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine or a self-service machine, and the like, and the embodiments of the present application are not particularly limited.
The compensation gray level determination device in the embodiment of the present application may be a device having an operating system. The operating system may be an Android (Android) operating system, an ios operating system, or other possible operating systems, and embodiments of the present application are not limited specifically.
Fig. 8 is a schematic diagram illustrating a hardware structure of the compensation voltage determining apparatus according to the embodiment of the present invention.
The compensated gamma determination device may include a processor 801 and a memory 802 having stored thereon computer program instructions.
Specifically, the processor 801 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing embodiments of the present invention.
Memory 802 may include mass storage for data or instructions. By way of example, and not limitation, memory 802 may include a Hard Disk Drive (HDD), a floppy Disk Drive, flash memory, an optical Disk, a magneto-optical Disk, a tape, or a Universal Serial Bus (USB) Drive or a combination of two or more of these. Memory 802 may include removable or non-removable (or fixed) media, where appropriate. The memory 802 may be internal or external to the integrated gateway disaster recovery device, where appropriate. In a particular embodiment, the memory 802 is a non-volatile solid-state memory. In a particular embodiment, the memory 802 includes Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
The processor 801 reads and executes computer program instructions stored in the memory 802 to implement any one of the compensation gray scale determination methods in the above-described embodiments.
In one example, the compensation gray level determining apparatus may further include a communication interface 803 and a bus 810. As shown in fig. 8, the processor 801, the memory 802, and the communication interface 803 are connected via a bus 810 to complete communication therebetween.
The communication interface 803 is mainly used for implementing communication between modules, apparatuses, units and/or devices in the embodiments of the present invention.
Bus 810 includes hardware, software, or both to couple the components of the compensation voltage determination device to each other. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hypertransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or a combination of two or more of these. Bus 810 may include one or more buses, where appropriate. Although specific buses have been described and shown in the embodiments of the invention, any suitable buses or interconnects are contemplated by the invention.
The compensation gray scale determining apparatus may perform the compensation gray scale determining method in the embodiment of the present application, thereby implementing the compensation gray scale determining method and the compensation gray scale determining device described in conjunction with fig. 2 and 7.
An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the compensation gray scale determining method in the foregoing embodiments can be implemented, and the same technical effect can be achieved.
The processor is the processor in the electronic device in the above embodiment. Examples of a computer-readable storage medium include a non-transitory machine-readable medium, such as an electronic circuit, a semiconductor Memory device, a Read-Only Memory (ROM), a flash Memory, an erasable ROM (erom), a floppy disk, a CD-ROM, an optical disk, a hard disk, and so forth.
It is to be understood that the present application is not limited to the particular arrangements and instrumentality described above and shown in the attached drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present application.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. "computer-readable media" may include any medium that can store or transfer information. Examples of computer readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
Aspects of the present application are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware for performing the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In accordance with the embodiments of the present application as described above, these embodiments are not exhaustive and do not limit the application to the specific embodiments described. 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 application and its practical application, to thereby enable others skilled in the art to best utilize the application and its various modifications as are suited to the particular use contemplated. The application is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A method for compensating a gray level determination, the method comprising:
displaying a calibration picture in a test area of a display panel, wherein the test area comprises a first sub-area and a second sub-area, the calibration picture comprises a first picture and a second picture, the gray scale value of the first picture is a first gray scale value, the gray scale value of the second picture is a second gray scale value, the first sub-area displays the first picture, and the second sub-area displays the second picture;
acquiring first brightness of the first sub-area and second brightness of the second sub-area;
determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness and the second brightness;
and determining a compensation gray-scale value of the sub-pixel of the display panel under the first gray-scale value according to the calibration gamma value.
2. The method according to claim 1, wherein the number of the first sub-area and the second sub-area is plural, and the plural first sub-areas and the plural second sub-areas are alternately distributed in a first direction and a second direction intersecting each other;
preferably, the first sub-area and the second sub-area are both rectangular areas, the lengths of the first sub-area and the second sub-area in the first direction are equal, and the widths of the first sub-area and the second sub-area in the second direction are equal.
3. The method of claim 1, wherein the first sub-area and the second sub-area are each provided in a plurality of numbers, and wherein the method further comprises, before determining the calibration gamma value according to the first brightness and the second brightness:
calculating a first brightness mean value of a plurality of first sub-areas and a second brightness mean value of a plurality of second sub-areas;
the determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness and the second brightness includes:
and determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness mean value and the second brightness mean value.
4. The method as claimed in claim 3, wherein the determining the calibration gamma value corresponding to the first gray level value according to the first brightness average and the second brightness average comprises:
determining the calibration gamma value according to the following expression:
wherein, GammaratioRepresenting the calibration gamma value, N1 representing the first gray level value, N2 representing the second gray level value, Ln1Representing said first luminance mean value, Ln2Representing the second luminance mean value.
5. The method as claimed in claim 1, wherein the determining the compensated gray scale value of the sub-pixel of the display panel at the first gray scale value according to the calibration gamma value comprises:
determining the compensated gray scale value according to the following expression:
wherein N isxRepresenting said compensation gray level, N1 representing said first gray level, LaverRepresenting a target luminance value, L, corresponding to said first gray level value1A collected luminance value, Gamma, of the sub-pixel of the display panel at the first gray scale valueratioRepresenting the calibration gamma value.
6. The method of claim 1, wherein prior to determining the compensated gray scale value at the first gray scale value for a sub-pixel of the display panel based on the calibration gamma value, the method further comprises:
determining a collected luminance value of a sub-pixel in the second sub-region at the first gray-scale value according to the following expression:
wherein L is21Representing an acquired luminance value, L, of a sub-pixel within said second sub-area at said first gray level value2Representing the collected luminance values of the sub-pixels in the second sub-region at the second gray scale value, N1 representing the first gray scale value, N2 representing the second gray scale value, GammaratioRepresenting the calibration gamma value.
7. The method of claim 1, wherein before the calibration frame is displayed in the test area of the display panel, the method further comprises:
acquiring brightness data of sub-pixels in at least part of display areas of the display panel under the first picture;
determining a brightness difference range according to the brightness data of the sub-pixels in at least part of the display area under the first picture;
and determining the second gray-scale value according to the brightness difference range, so that a first ratio is greater than or equal to the maximum value of the brightness difference range, the first ratio is the ratio of a first difference value and the brightness mean value of the at least part of display area, and the first difference value is the difference between the brightness value corresponding to the second gray-scale value on a preset gamma curve and the brightness mean value of the at least part of display area.
8. The method as claimed in claim 1, wherein the display panel comprises a plurality of sub-pixels, the first frame comprises a first frame corresponding to each of the sub-pixels of each color, the second gray scale frame comprises a second frame corresponding to each of the sub-pixels of each color, and the determining the calibration gamma value according to the first brightness and the second brightness comprises:
and determining the calibration gamma value corresponding to the sub-pixel of each color according to the first brightness and the second brightness.
9. A compensated gamma determination apparatus, comprising:
the display enabling module is used for displaying a calibration picture in a test area of the display panel, the test area comprises a first sub-area and a second sub-area which are alternately distributed, the calibration picture comprises a first picture and a second picture, the gray scale value of the first picture is a first gray scale value, the gray scale value of the second picture is a second gray scale value, the first sub-area displays the first picture, and the second sub-area displays the second picture;
the brightness acquisition module is used for acquiring first brightness of the first sub-area and second brightness of the second sub-area;
the calibration gamma determining module is used for determining a calibration gamma value corresponding to the first gray-scale value according to the first brightness and the second brightness;
and the compensation gray scale determining module is used for determining a compensation gray scale value of the sub-pixel of the display panel under the first gray scale value according to the calibration gamma value.
10. A compensated gamma determination device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing the compensated gamma determination method of any of claims 1 to 8.
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