CN110364116B - Gray scale compensation method, gray scale compensation device and display module - Google Patents
Gray scale compensation method, gray scale compensation device and display module Download PDFInfo
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- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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Abstract
The invention relates to a gray scale compensation method, a gray scale compensation device and a display module. The gray scale compensation method can perform gray scale compensation on each sub-pixel in the display area, so that the actual brightness of each sub-pixel is closer to the target brightness of each sub-pixel, and the light emission of the display panel is more uniform. Meanwhile, the gray scale compensation method respectively performs gray scale compensation on the sub-pixels according to the integer part and the decimal part of the gray scale difference value, so that the fineness of the gray scale compensation can be increased, and the light emitting uniformity of the OLED display panel is further improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a gray scale compensation method, a gray scale compensation device and a display module.
Background
In recent years, an OLED (Organic Light-Emitting Diode) display panel has been gradually replacing a CRT (Cathode Ray Tube) display panel, and has become a mainstream product in the display panel market.
In the conventional technology, the light emitted from the OLED display panel is usually electroluminescence emitted by the sub-pixels disposed therein. In order to make the light emitted from the OLED display panel more uniform, the OLED display panel is usually gray-scale compensated.
The applicant found in the course of implementing the conventional technique that: the traditional OLED display panel has the defects that the gray scale compensation is not fine enough and the problem of uneven light emitting display is still obvious.
Disclosure of Invention
Therefore, it is necessary to provide a gray scale compensation method, a gray scale compensation device and a display module for solving the problem of the prior art that the gray scale compensation of the OLED display panel is not fine enough.
A gray scale compensation method for gray scale compensation of an original image of a display area, the display area having a plurality of sub-pixels, comprising:
acquiring an original gray-scale value and a standard gamma curve of a first sub-pixel in the display area;
acquiring the target brightness of the first sub-pixel corresponding to the original gray-scale value on the standard gamma curve;
acquiring an actual gamma curve of the first sub-pixel;
acquiring a target gray-scale value corresponding to the target brightness on the actual gamma curve;
acquiring a gray scale difference value of the target gray scale value and the original gray scale value, wherein the gray scale difference value comprises an integer part and a decimal part;
performing gray scale compensation on the first sub-pixel according to a first preset compensation coefficient aiming at the integer part of the gray scale difference value; and performing gray scale compensation on the first sub-pixel according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value, wherein the second preset compensation coefficient is not more than 1.
The gray scale compensation method can perform gray scale compensation on each sub-pixel in the display area, so that the actual brightness of each sub-pixel is closer to the target brightness of each sub-pixel, and the light emission of the display panel is more uniform. Meanwhile, the gray scale compensation method respectively performs gray scale compensation on the sub-pixels according to the integer part and the decimal part of the gray scale difference value, so that the fineness of the gray scale compensation can be increased, and the light emitting uniformity of the OLED display panel is further improved.
A gray scale compensation method for gray scale compensating an original image of a display area, the display area having a plurality of sub-pixels, the plurality of sub-pixels including a plurality of red sub-pixels, a plurality of green sub-pixels and a plurality of blue sub-pixels, the display area including a plurality of display sub-areas, any of the display sub-areas having a plurality of sub-pixels of a same color, the method comprising:
acquiring original gray scale values of all sub-pixels in a first display sub-area, and obtaining an original gray scale mean value of the first display sub-area according to the original gray scale values of all sub-pixels;
acquiring a standard gamma curve, and acquiring the target brightness of the first display sub-region corresponding to the original gray scale mean value on the standard gamma curve;
acquiring an actual gamma curve of the first display sub-region;
acquiring a target gray-scale value corresponding to the target brightness on the actual gamma curve;
acquiring a gray scale difference value of the target gray scale value and the original gray scale mean value, wherein the gray scale difference value comprises an integer part and a decimal part;
performing gray scale compensation on each sub-pixel in the first display sub-area according to a first preset compensation coefficient aiming at the integer part of the gray scale difference value; and performing gray scale compensation on each sub-pixel in the first display sub-area according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value, wherein the second preset compensation coefficient is not more than 1.
According to the gray scale compensation method, the display area is divided into the plurality of display sub-areas, and gray scale compensation can be performed on each display sub-area, so that the actual brightness of each display sub-area is closer to the target brightness of the display sub-area, and the light emission of the display panel is more uniform. Meanwhile, the gray scale compensation method is used for performing gray scale compensation on each display sub-area, so that the calculation data during the operation of the gray scale compensation method can be reduced, and the OLED display panel has both light-emitting uniformity and calculation simplicity.
A display module comprises a display panel and a driving device for driving the display panel, and is characterized by further comprising a gray scale compensation device in any one of the embodiments so as to perform gray scale compensation on a display image of the display panel.
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Fig. 1 is a schematic view of a sub-pixel arrangement structure of a display area according to an embodiment of the present application.
FIG. 2 is a flowchart illustrating a gray scale compensation method according to an embodiment of the present application.
FIG. 3 is a flowchart illustrating a step S300 of a gray scale compensation method according to an embodiment of the present application.
FIG. 4 is a partial detailed flowchart of the step S600 of the gray scale compensation method according to an embodiment of the present application.
FIG. 5 is a partial detailed flowchart of the step S600 of the gray scale compensation method according to another embodiment of the present application.
Fig. 6 is a schematic diagram illustrating region division of display sub-regions in an embodiment of the present application.
FIG. 7 is a flowchart illustrating a gray scale compensation method according to another embodiment of the present application.
FIG. 8 is a partial detailed flowchart of a step S600' of a gray scale compensation method according to another embodiment of the present application.
FIG. 9 is a partial detailed flowchart of a step S600' of a gray scale compensation method according to another embodiment of the present application.
Wherein, the meanings represented by the reference numerals of the figures are respectively as follows:
10. a display area;
110. a light emitting pixel;
112. a sub-pixel;
12. and displaying the sub-area.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
As shown in fig. 1, in general, the display region 10 of the OLED display panel generally has a plurality of light emitting pixels 110, and each light emitting pixel 110 is composed of an R (red) sub-pixel, a G (green) sub-pixel, and a B (blue) sub-pixel. Therefore, the display region 10 has a plurality of sub-pixels 112, and the plurality of sub-pixels 112 includes a plurality of red sub-pixels, a plurality of green sub-pixels, and a plurality of blue sub-pixels. The plurality of sub-pixels 112 in the display area 10 emit light to constitute an image.
When an image is constructed, the gray scale values of different sub-pixels 112 are different, and the luminance of the sub-pixels 112 corresponding to different gray scale values is also different. Generally, the luminance of the sub-pixels 112 of the same color under the same gray level value should be the same, and the corresponding relationship between the gray level value and the luminance is the standard gamma curve. When the sub-pixels 112 of the same color have different brightness at the same gray scale value, the problem of display unevenness is caused. In other words, in practical applications, the actual gamma curve of each sub-pixel 112 may deviate from the standard gamma curve to different degrees, and this constitutes a problem of display non-uniformity. The embodiment of the application provides a gray scale compensation method, a gray scale compensation device and a display module aiming at the problem of uneven display of an OLED display screen.
In the embodiments of the present application, the image of the display region 10 before the gray-scale compensation is referred to as an original image, and the image of the display region 10 after the gray-scale compensation is referred to as a compensated image. The gray level value of the sub-pixel 112 corresponding to the original image is referred to as the original gray level value.
The gray scale compensation method of the present application requires separate gray scale compensation for each color of the sub-pixels 112. I.e. gray scale compensation needs to be performed separately for the red, blue and green sub-pixels. For all the sub-pixels 112 of each color, gray scale compensation may be performed on each sub-pixel 112 individually, or gray scale compensation may be performed on each display sub-region by dividing a plurality of sub-pixels 112 of the same color into one display sub-region.
The gray scale compensation of one sub-pixel 112 is taken as an example for explanation, and the sub-pixel 112 in the example is named as the first sub-pixel. It should be noted that the first sub-pixel may be any one of the sub-pixels 112 in the display area 10.
As shown in fig. 2, the gray scale compensation method includes the following steps:
s100, acquiring an original gray-scale value and a standard gamma curve of a first sub-pixel in the display area.
And performing gray scale compensation on the first sub-pixel in the display area. And when each sub-pixel in the display area emits light to form an original image, acquiring an original gray-scale value of the first sub-pixel. Meanwhile, the gray scale compensation method also needs to obtain a standard gamma curve. The standard gamma curve is a curve represented by the corresponding relationship between the physical gray scale and the display brightness of the first sub-pixel under the theoretical condition. As described above, in the theoretical case, the luminance of each sub-pixel is equal when the gray scale values are equal for different sub-pixels of the same color. The standard gamma curve may be pre-stored in memory for recall in use.
According to the gray scale compensation method, gray scale compensation is carried out on the first sub-pixel by taking the standard brightness corresponding to the original gray scale value on the standard gamma curve as the target brightness. Therefore, the gray scale compensation method should first obtain the original gray scale value and the standard gamma curve of the first sub-pixel.
S200, acquiring the target brightness of the first sub-pixel corresponding to the original gray-scale value on the standard gamma curve.
Specifically, the original gray-scale value and the standard gamma curve of the first sub-pixel have been obtained in step S100. And finding out the standard brightness corresponding to the original gray-scale value on the standard gamma curve, wherein the standard brightness is the target brightness of the original gray-scale value of the first sub-pixel.
S300, acquiring an actual gamma curve of the first sub-pixel.
Specifically, as mentioned above, actually, the actual gamma curve of each sub-pixel may have a certain discrepancy with the standard gamma curve, and in this step, the actual gamma curve of the first sub-pixel needs to be obtained. In this embodiment, the obtaining manner of the actual gamma curve of the first sub-pixel is not limited. Generally, the actual gamma curve of the first sub-pixel may be detected in advance and stored in a memory for use; or, the actual gamma curve of the first sub-pixel may be obtained by detecting the gray-scale value of the first sub-pixel and the actual brightness corresponding to the gray-scale value in real time during the gray-scale compensation process, and according to the correspondence between the gray-scale value and the actual brightness.
And S400, acquiring a target gray-scale value corresponding to the target brightness on the actual gamma curve.
Specifically, in the step S200, the target brightness of the first sub-pixel at the original gray-scale value is obtained; the actual gamma curve of the first sub-pixel has been derived in said step S300. At this time, the gray scale value corresponding to the target brightness can be found on the actual gamma curve of the first sub-pixel, and the gray scale value can be used as the target gray scale value for performing gray scale compensation on the first sub-pixel.
On the actual gamma curve of the first sub-pixel, the luminance corresponding to the target gray-scale value is the standard luminance corresponding to the original gray-scale value on the standard gamma curve.
S500, obtaining a gray scale difference value of the target gray scale value and the original gray scale value, wherein the gray scale difference value comprises an integer part and a decimal part.
Specifically, the step S100 already obtains the original gray-scale value of the first sub-pixel, and the step S400 obtains the target gray-scale value of the first sub-pixel. At this time, the gray scale difference of the first sub-pixel can be obtained according to the original gray scale value and the target gray scale value of the first sub-pixel. Generally, the original gray-scale value of the first sub-pixel is an integer, and the target gray-scale value of the first sub-pixel is a gray-scale value corresponding to the target luminance on the actual gamma curve of the first sub-pixel, which may be an integer or a decimal. Thus, the gray scale difference value includes an integer portion and a fractional portion, which may be 0. For example, the gray scale difference may be 1.2, 2.0, etc.
S600, performing gray scale compensation on the first sub-pixel according to a first preset compensation coefficient aiming at the integer part of the gray scale difference value; and performing gray scale compensation on the first sub-pixel according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value, wherein the second preset compensation coefficient is not more than 1.
Specifically, gray scale compensation is performed on the first sub-pixel according to the gray scale difference value. The gray scale compensation here needs to compensate for the integer part and the fractional part of the gray scale difference value respectively. And aiming at the integer part of the gray scale difference value, performing gray scale compensation on the first sub-pixel according to a first preset compensation coefficient. And performing gray scale compensation on the first sub-pixel according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value. Generally, the first preset compensation coefficient is an integer, and the second preset compensation coefficient is a fraction no greater than 1 or 1.
More specifically, for the first sub-pixel, the gray scale compensation method comprises the steps of: and acquiring an original gray-scale value and a standard gamma curve of the first sub-pixel. And then finding out the brightness corresponding to the original gray scale value on a standard gamma curve, wherein the brightness is the target brightness of the first sub-pixel. And then acquiring an actual gamma curve of the first sub-pixel, and finding a gray-scale value corresponding to the target brightness on the actual gamma curve as a target gray-scale value. And finally, performing gray scale compensation on the first sub-pixel according to the gray scale difference value between the target gray scale value and the original gray scale value: aiming at the integer part of the gray scale difference value, performing gray scale compensation on the first sub-pixel according to a first preset compensation coefficient; and performing gray scale compensation on the first sub-pixel according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value.
The gray scale compensation method can perform gray scale compensation on each sub-pixel in the display area, so that the actual brightness of each sub-pixel is closer to the target brightness of the sub-pixel, and the light emission of the display panel is more uniform. Meanwhile, the gray scale compensation method respectively performs gray scale compensation on the sub-pixels according to the integer part and the decimal part of the gray scale difference value, so that the fineness of the gray scale compensation can be increased, and the light emitting uniformity of the OLED display panel is further improved.
In an embodiment, as shown in fig. 3, in the gray scale compensation method, in the step S300, the actual gamma curve of the first sub-pixel is obtained, which may be obtained by detecting the gray scale value of the first sub-pixel and the actual brightness corresponding to the gray scale value in real time during the gray scale compensation process, and obtaining the actual brightness according to the corresponding relationship between the gray scale value and the actual brightness. At this time, the step S300 may include:
s310, acquiring a first actual brightness of the first sub-pixel at a first gray-scale value.
Specifically, the actual brightness corresponding to the first sub-pixel at the first gray scale value is obtained, and the actual brightness corresponding to the first gray scale value is named as the first actual brightness. The first gray scale value may be any one of gray scale values of 0 to 255.
S320, changing the gray-scale value of the first sub-pixel to be a second gray-scale value, and acquiring a second actual brightness of the first sub-pixel at the second gray-scale value.
Specifically, the gray scale value of the first sub-pixel is changed to be a second gray scale value. The second gray scale value is any gray scale value different from the first gray scale value. And acquiring the actual brightness corresponding to the first sub-pixel at the second gray-scale value. And naming the actual brightness of the first sub-pixel corresponding to the second gray-scale value as a second actual brightness.
S330, repeating the previous step to obtain at least three groups of corresponding relations between the gray-scale values of the first sub-pixel and the actual brightness.
Specifically, the step S320 is repeated, that is, the gray-scale value of the first sub-pixel is continuously changed, and the actual brightness of the first sub-pixel after the gray-scale value is changed is obtained.
It should be noted that at least three sets of corresponding relationships between the gray-scale values of the first sub-pixel and the actual brightness need to be obtained after the step S330 is completed. In other words, after the step S330 is completed, at least the first gray-scale value, the first actual brightness, the second gray-scale value, the second actual brightness, the third gray-scale value and the third actual brightness of the first sub-pixel need to be obtained. The second gray scale value is any gray scale value different from the first gray scale value; the third gray scale value is any one gray scale value different from the first gray scale value and the second gray scale value. The third actual brightness is the actual brightness of the first sub-pixel corresponding to the third gray-scale value.
S340, obtaining an actual gamma curve of the first sub-pixel according to the corresponding relation between the gray-scale value of the first sub-pixel and the actual brightness.
Specifically, in step S330, the corresponding relationship between the gray-scale values and the actual brightness of at least three groups of the first sub-pixels is obtained. And fitting the gray-scale value and the actual brightness to obtain a fitting curve, namely the actual gamma curve of the first sub-pixel, by taking the gray-scale value as an abscissa and the actual brightness as an ordinate.
According to the gray scale compensation method, the gray scale value of the first sub-pixel and the actual brightness corresponding to the gray scale value can be detected in real time in the gray scale compensation process, and the actual gamma curve can be obtained according to the corresponding relation of the gray scale value and the actual brightness. By using the method, the real-time actual gamma curve of the first sub-pixel can be obtained, so that the compensation of the gray scale compensation method is more accurate, and the display uniformity of the display panel is improved.
In a specific embodiment, the step S330 may include: repeating the previous step four times to obtain six groups of corresponding relations between the gray-scale values of the first sub-pixels and the actual brightness, wherein the gray-scale values of the first sub-pixels are 32, 64, 96, 128, 192 and 224 respectively.
In this case, the step S300 may specifically include: acquiring a first actual brightness of the first sub-pixel at a gray-scale value of 32; and changing the gray-scale value of the first sub-pixel to 64, and acquiring a second actual brightness of the first sub-pixel at the gray-scale value of 64. Changing the gray-scale value of the first sub-pixel to 96, and acquiring a third actual brightness of the first sub-pixel at the gray-scale value of 96. Changing the gray-scale value of the first sub-pixel to 128, and acquiring a fourth actual brightness of the first sub-pixel at the gray-scale value of 128. Changing the gray-scale value of the first sub-pixel to 192, and acquiring a fifth actual brightness of the first sub-pixel at the gray-scale value of 192. Changing the gray-scale value of the first sub-pixel to 224, and obtaining a sixth actual brightness of the first sub-pixel at the gray-scale value of 224. And fitting according to the 32 gray scales and the first actual brightness, the 64 gray scales and the second actual brightness, the 96 gray scales and the third actual brightness, the 128 gray scales and the fourth actual brightness, the 192 gray scales and the fifth actual brightness, and the 224 gray scales and the sixth actual brightness to obtain the actual gamma curve.
The gray scale compensation method obtains the actual brightness of the first sub-pixel at the gray scale values of 32, 64, 96, 128, 192 and 224 respectively, and obtains the actual gamma curve. Because the gray-scale values selected by the obtained actual gamma curve are relatively more uniform, the actual gamma curve can be more accurate, and the display uniformity of the display panel is improved.
In one embodiment, as shown in fig. 4, the performing gray scale compensation on the first sub-pixel according to a first preset compensation coefficient for the integer part of the gray scale difference value in step S600 includes:
s611, obtaining the numerical value of the integer part of the gray scale difference value;
s612, taking the numerical value of the integer part of the gray scale difference value as the first preset compensation coefficient, and performing gray scale compensation on the first sub-pixel.
Specifically, for the gray scale difference value including an integer part and a decimal part, gray scale compensation is performed on the first sub-pixel according to the fact that the numerical value of the integer part of the gray scale difference value is a first preset compensation coefficient. For example, when the gray scale difference is 1.2, the integer part of the gray scale difference is 1, and at this time, the first preset compensation coefficient is 1 to perform gray scale compensation on the first sub-pixel. When the gray scale difference value is 2.8, the integer part of the gray scale difference value is 2, and at this time, the first preset compensation coefficient is 2 to perform gray scale compensation on the first sub-pixel.
In one embodiment, as shown in fig. 5, the performing gray scale compensation on the first sub-pixel according to a second preset compensation coefficient for the fractional part of the gray scale difference value in step S600, where the second preset compensation coefficient is not greater than 1, includes:
s621, obtaining the numerical value of the decimal part of the gray scale difference value, and judging the magnitude relation between the numerical value of the decimal part of the gray scale difference value and a first preset value.
S622, if the value of the fractional part of the gray-scale difference is smaller than the first preset value, the second preset compensation coefficient is 0.
Specifically, for the gray-scale difference value including an integer part and a decimal part, the second preset compensation coefficient is determined according to the numerical value of the decimal part of the gray-scale difference value, so as to perform gray-scale compensation on the first sub-pixel. For example, when the gray scale difference value is 1.2, the fractional part of the gray scale difference value is 0.2. At this time, 0.2 is compared with the first preset value, and when 0.2 is smaller than the first preset value, the second compensation coefficient is made to be 0. That is, if the value of the decimal part of the gray scale difference value is smaller than the first preset value, the gray scale compensation is not performed on the first sub-pixel. Generally, the first predetermined value is greater than 0 and less than 0.5, so that the gray-scale compensated luminance of the first sub-pixel is closer to the target luminance.
Further, as shown in fig. 5, the performing gray scale compensation on the first sub-pixel according to a second preset compensation coefficient for the fractional part of the gray scale difference value in step S600, where the second preset compensation coefficient is not greater than 1, may further include:
s623, if the numerical value of the decimal part of the gray scale difference value is larger than or equal to the first preset value, judging the magnitude relation between the numerical value of the decimal part of the gray scale difference value and a second preset value.
S624, if the value of the fractional part of the gray-scale difference is greater than or equal to the first preset value and less than or equal to the second preset value, the second preset compensation coefficient is greater than or equal to 0.3 and less than or equal to 0.7.
If the numerical value of the decimal part of the gray scale difference value is greater than or equal to the first preset value and less than or equal to the second preset value, performing gray scale compensation on the first sub-pixel according to the second preset compensation coefficient. At this time, the second preset compensation coefficient may be any gray scale value greater than or equal to 0.3 and less than or equal to 0.7. Preferably, when the value of the fractional part of the gray-scale difference is greater than or equal to the first preset value and less than or equal to the second preset value, the second preset compensation coefficient is 0.5.
Generally, the second predetermined value is greater than 0.5 and less than 1, so that the gray-scale compensated luminance of the first sub-pixel is closer to the target luminance.
Further, as shown in fig. 5, the performing gray scale compensation on the first sub-pixel according to a second preset compensation coefficient for the fractional part of the gray scale difference value in step S600, where the second preset compensation coefficient is not greater than 1, may further include:
s625, if the numerical value of the decimal part of the gray scale difference value is greater than the second preset value, the second preset compensation coefficient is equal to 1.
According to the gray scale compensation method, the gray scale compensation condition is divided, so that the actual brightness of the first sub-pixel after gray scale compensation is closer to the target brightness under the condition of increasing little calculation amount, and the light emitting uniformity of the display panel is improved.
In a specific embodiment, after obtaining the gray scale difference value, for the integer part of the gray scale difference value: and performing gray scale compensation on the first sub-pixel by taking the numerical value of the integer part of the gray scale difference value as the first preset compensation coefficient. That is, if the value of the integer part of the gray scale difference value is 1, the first preset compensation coefficient is 1, that is, the gray scale of the first sub-pixel 1 is compensated for the integer part of the gray scale difference value. If the value of the integer part of the gray scale difference value is 2, the first preset compensation coefficient is 2, that is, the gray scale of the first sub-pixel 2 is compensated for the integer part of the gray scale difference value.
For the fractional part of the gray scale difference value: the first preset value may be 0.25 and the second preset value may be 0.75. At this time: when the decimal part of the gray scale difference value between the target gray scale value and the original gray scale value is less than 0.25, the second preset compensation coefficient is 0, namely, the gray scale compensation is not performed on the first sub-pixel according to the decimal part of the gray scale difference value. And if the decimal part of the gray scale difference value between the target gray scale value and the original gray scale value is greater than or equal to 0.25 and less than or equal to 0.75, the second preset compensation coefficient is 0.5, namely the first sub-pixel gray scale is compensated aiming at the decimal part of the gray scale difference value, wherein the first sub-pixel gray scale is 0.5. If the decimal part of the gray scale difference value between the target gray scale value and the original gray scale value is greater than 0.75, the second preset compensation coefficient is 1, namely the first sub-pixel 1 gray scale is compensated aiming at the decimal part of the gray scale difference value.
The gray scale compensation method of the present application is explained below with a specific embodiment, in which the gray scale value of the first sub-pixel ranges from 0 to 255 gray scales when the display area emits light. The gray scale compensation method comprises the following steps:
and acquiring an original gray-scale value and a standard gamma curve of the first sub-pixel in the display area. The original gray scale value is 50.
Acquiring the target brightness of the first sub-pixel corresponding to the 50 gray-scale value on the standard gamma curve, wherein the target brightness of the first sub-pixel is 23.2cd/m2。
And acquiring the brightness of the first sub-pixel at the gray-scale values of 32, 64, 96, 128, 192 and 224, and obtaining an actual gamma curve of the first sub-pixel according to the brightness of the first sub-pixel at the gray-scale values of 32, 64, 96, 128, 192 and 224.
Obtaining the 23.2cd/m on the actual gamma curve2And the target gray-scale value corresponds to the brightness, and the target gray-scale value is 51.2.
And acquiring a gray scale difference value between the target gray scale value and the original gray scale value, wherein the gray scale difference value is 1.2, namely the integer part of the gray scale difference value is 1, and the decimal part of the gray scale difference value is 0.2.
Presetting: the first preset compensation coefficient is a numerical value of an integer part of the gray scale difference value. The first preset value is 0.25 and the second preset value is 0.75. And if the numerical value of the decimal part of the gray scale difference value is less than 0.25, the second preset compensation coefficient is 0. And if the numerical value of the decimal part of the gray-scale difference value is more than or equal to 0.25 and less than or equal to 0.75, the second preset compensation coefficient is 0.5. And if the numerical value of the decimal part of the gray scale difference value is greater than 0.75, the numerical value of the second preset compensation coefficient is 1.
Therefore, when the gray scale difference value is 1.2, the gray scale of the first sub-pixel is compensated for 1.0. When the gray scale difference value is 1.4, the gray scale of the first sub-pixel is compensated for 1.5. When the gray scale difference is 1.8, the gray scale of the first sub-pixel 2 is compensated.
The application also provides a gray scale compensation device based on the gray scale compensation method in any one of the embodiments. The gray scale compensation device comprises an acquisition module, a target brightness calculation module, a target gray scale value calculation module, a difference value acquisition module and a gray scale compensation module.
Specifically, the obtaining module is configured to obtain an original gray-scale value and a standard gamma curve of a first sub-pixel in the display area.
The target brightness calculation module is used for acquiring the target brightness of the first sub-pixel corresponding to the original gray-scale value on the standard gamma curve.
The target gray-scale value calculation module is used for acquiring an actual gamma curve of the first sub-pixel and acquiring a target gray-scale value corresponding to the target brightness on the actual gamma curve.
The difference value obtaining module is used for obtaining a gray scale difference value of the target gray scale value and the original gray scale value, and the gray scale difference value comprises an integer part and a decimal part.
The gray scale compensation module is used for performing gray scale compensation on the first sub-pixel according to a first preset compensation coefficient aiming at the integer part of the gray scale difference value, and the first preset compensation coefficient is an integral multiple of 0.5; and performing gray scale compensation on the second sub-pixel according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value, wherein the second preset compensation coefficient is not more than 1.
In the above embodiments, the gray scale compensation method performs gray scale compensation for each sub-pixel individually. In other embodiments of the present application, the gray scale compensation method in the present application may also divide the display area into a plurality of display sub-areas. Each display sub-area is provided with a plurality of sub-pixels with the same color, and gray scale compensation is carried out on each display sub-area independently.
As shown in fig. 6, a plurality of adjacent sub-pixels 112 of the same color in the display area 10 may be divided into one display sub-area 12. In other words, the display sub-region 12 includes a plurality of adjacent sub-pixels 112 of the same color. Plural here means two or more. In general, the number of sub-pixels 112 in the display sub-region 12 may be two or four. When the number of the sub-pixels 112 in the display sub-region 12 is four, the arrangement of the four sub-pixels 112 may be 2 × 2. In the gray scale compensation method, the number of sub-pixels 112 in different display sub-regions 12 may be different.
The gray scale compensation of one display sub-region 12 is taken as an example, and the display sub-region 12 is named as a first display sub-region. It is noted that the first display sub-region may be any one of the display sub-regions 12 within the display region 10.
As shown in fig. 7, the gray scale compensation method includes the following steps:
s100', obtaining original gray scale values of all sub-pixels in a first display sub-area, and obtaining an original gray scale mean value of the first display sub-area according to the original gray scale values of all sub-pixels.
And performing gray scale compensation on the first display subarea in the display area. When the sub-pixels in the display area emit light to form an original image, acquiring original gray-scale values of all sub-pixels in the first display sub-area, and obtaining an original gray-scale average value of the first display sub-area according to the original gray-scale values of all sub-pixels.
Specifically, the original gray-scale average value of the first display sub-region is an average of the original gray-scale values of all the sub-pixels in the first display sub-region. For example, when the first display sub-region has two sub-pixels, and the gray-scale values of the two sub-pixels are 32 and 33, respectively, the original gray-scale average value of the first display sub-region is 32.5.
S200', a standard gamma curve is obtained, and the target brightness of the first display sub-region corresponding to the original gray scale mean value on the standard gamma curve is obtained.
A standard gamma curve is obtained. The standard gamma curve may be pre-stored in memory for recall in use. And finding out the standard brightness corresponding to the original gray scale mean value on the standard gamma curve. The standard brightness is the target brightness of the original gray scale mean value of the first display sub-area. The standard gamma curve may be pre-stored in memory for recall in use.
S300', acquiring an actual gamma curve of the first display sub-region.
In this embodiment, the obtaining manner of the actual gamma curve of the first display sub-region is not limited. In general, the actual gamma curve of the first display sub-region may be detected in advance and stored in a memory for recall when used; or, the actual gamma curve of the first display sub-region may also be obtained by detecting the gray scale mean value of the first display sub-region and the actual brightness mean value corresponding to the gray scale mean value in real time during the gray scale compensation process, and according to the correspondence between the gray scale mean value and the actual brightness mean value.
S400', a target gray-scale value corresponding to the target brightness on the actual gamma curve is obtained.
Specifically, in the step S200', the target brightness of the first display sub-region under the original gray scale average value is obtained; in step S300', the actual gamma curve of the first display sub-region has been derived. At this time, the gray scale average value corresponding to the target brightness can be found on the actual gamma curve of the first display sub-region, and the gray scale average value can be used as a target gray scale value for performing gray scale compensation on the first display sub-region.
On the actual gamma curve of the first display sub-region, the luminance corresponding to the target gray-scale value is the standard luminance corresponding to the original gray-scale mean value on the standard gamma curve.
S500', obtaining a gray scale difference value of the target gray scale value and the original gray scale mean value, wherein the gray scale difference value comprises an integer part and a decimal part.
Specifically, the step S100 'obtains an original gray-scale average value of the first display sub-region, and the step S400' obtains a target gray-scale value of the first display sub-region. At this time, the gray scale difference value of the first display sub-region can be obtained according to the original gray scale mean value and the target gray scale value of the first display sub-region. In general, the gray scale difference values include an integer portion and a fractional portion, which may be 0. For example, the gray scale difference may be 1.2, 2.0, etc.
S600', performing gray scale compensation on each sub-pixel in the first display sub-area according to a first preset compensation coefficient aiming at the integer part of the gray scale difference value; and performing gray scale compensation on each sub-pixel in the first display sub-area according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value, wherein the second preset compensation coefficient is not more than 1.
Specifically, gray scale compensation is performed on each sub-pixel in the first display sub-area according to the gray scale difference value. The gray scale compensation here needs to compensate for the integer part and the fractional part of the gray scale difference value respectively. And aiming at the integer part of the gray scale difference value, performing gray scale compensation on each sub-pixel in the first display sub-area according to a first preset compensation coefficient. And aiming at the decimal part of the gray scale difference value, performing gray scale compensation on each sub-pixel in the first display sub-area according to a second preset compensation coefficient. Generally, the first preset compensation factor is an integer and the second preset compensation factor is a fraction no greater than 1.
The gray scale compensation method can perform gray scale compensation on each display sub-area in the display area, so that the actual brightness of each display sub-area is closer to the target brightness of the display sub-area, and the light emission of the display panel is more uniform. In addition, the gray scale difference value is calculated by taking each display sub-area as a unit, so that the calculation data during the operation of the gray scale compensation method can be reduced, and the calculation simplicity is further improved.
In the foregoing steps S310 to S330, the gray-scale value of the first sub-pixel and the actual brightness corresponding to the gray-scale value are collected, and the actual gamma curve of the first sub-pixel is obtained by fitting according to the corresponding relationship between the gray-scale value and the actual brightness. In this case, the actual gamma curve of the first display sub-region is obtained by: and acquiring the gray scale mean value of the first display sub-region and the actual brightness mean value corresponding to the gray scale mean value, and fitting according to the corresponding relation of the gray scale mean value and the actual brightness mean value to obtain an actual gamma curve of the first display sub-region. And will not be described in detail.
In one embodiment, as shown in fig. 8, the performing gray scale compensation on each sub-pixel in the first display sub-area according to a first preset compensation coefficient for the integer part of the gray scale difference value in step S600' includes:
s611', obtaining a numerical value of an integer part of the gray scale difference value;
s612', taking the value of the integer part of the gray scale difference value as the first preset compensation coefficient, and performing gray scale compensation on each sub-pixel in the first display sub-region.
In one embodiment, as shown in fig. 9, the performing gray scale compensation on each sub-pixel in the first display sub-area according to a second preset compensation coefficient for the fractional part of the gray scale difference value in step S600', where the second preset compensation coefficient is not greater than 1, includes:
s621', obtaining the numerical value of the decimal part of the gray scale difference value, and judging the magnitude relation between the numerical value of the decimal part of the gray scale difference value and a first preset value.
S622', if the value of the fractional part of the gray-scale difference is smaller than the first preset value, the second preset compensation coefficient is 0.
S623', if the numerical value of the decimal part of the gray scale difference value is greater than or equal to the first preset value, the magnitude relation between the numerical value of the decimal part of the gray scale difference value and a second preset value is judged.
S624', if the value of the fractional part of the gray-scale difference is greater than or equal to the first preset value and less than or equal to the second preset value, the second preset compensation coefficient is greater than or equal to 0.3 and less than or equal to 0.7.
S625', if the value of the fractional part of the gray-scale difference is greater than the second preset value, the second preset compensation coefficient is equal to 1.
In step S600', the gray scale compensation process for each sub-pixel in the first display sub-area according to the first preset compensation coefficient and the second preset compensation coefficient is the same as the gray scale compensation process for the first sub-pixel according to the first preset compensation coefficient in step S600, and is not repeated here.
The application also provides a gray scale compensation device based on the gray scale compensation method in the embodiment. The gray scale compensation device comprises an acquisition module, a target brightness calculation module, a target gray scale value calculation module, a difference value acquisition module and a gray scale compensation module.
Specifically, the obtaining module is configured to obtain original gray scale values of all sub-pixels in a first display sub-region, and obtain an original gray scale average value of the first display sub-region according to the original gray scale values of all sub-pixels.
The target brightness calculation module is used for acquiring a standard gamma curve and obtaining the target brightness of the first display sub-region corresponding to the original gray scale mean value on the standard gamma curve.
The target gray-scale value calculation module is used for acquiring an actual gamma curve of the first display sub-region and acquiring a target gray-scale value corresponding to the target brightness on the actual gamma curve.
The difference value obtaining module is used for obtaining a gray scale difference value of the target gray scale value and the original gray scale mean value, and the gray scale difference value comprises an integer part and a decimal part.
The gray scale compensation module is used for performing gray scale compensation on each sub-pixel in the first display sub-area according to a first preset compensation coefficient aiming at the integer part of the gray scale difference value, and the first preset compensation coefficient is an integral multiple of 0.5; and performing gray scale compensation on each sub-pixel in the first display sub-area according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value, wherein the second preset compensation coefficient is not more than 1. The application also provides a display module, which comprises a display panel and a driving device for driving the display panel, and further comprises a gray scale compensation device in any one of the above embodiments, so that gray scale compensation is performed on the display panel.
Specifically, the gray scale compensation device may include an obtaining module, a target brightness calculating module, a target gray scale value calculating module, a difference obtaining module, and a gray scale compensation module. The acquisition module is used for acquiring an original gray-scale value and a standard gamma curve of a first sub-pixel in the display area. The target brightness calculation module is used for acquiring the target brightness of the first sub-pixel corresponding to the original gray-scale value on the standard gamma curve. The target gray-scale value calculation module is used for acquiring an actual gamma curve of the first sub-pixel and acquiring a target gray-scale value corresponding to the target brightness on the actual gamma curve. The difference value obtaining module is used for obtaining a gray scale difference value of the target gray scale value and the original gray scale value, and the gray scale difference value comprises an integer part and a decimal part. The gray scale compensation module is used for performing gray scale compensation on the first sub-pixel according to a first preset compensation coefficient aiming at the integer part of the gray scale difference value, and the first preset compensation coefficient is an integral multiple of 0.5; and performing gray scale compensation on the second sub-pixel according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value, wherein the second preset compensation coefficient is not more than 1.
The gray scale compensation device also can comprise an acquisition module, a target brightness calculation module, a target gray scale value calculation module, a difference value acquisition module and a gray scale compensation module. The acquisition module is used for acquiring original gray-scale values of all sub-pixels in a first display sub-area and acquiring an original gray-scale mean value of the first display sub-area according to the original gray-scale values of all the sub-pixels. The target brightness calculation module is used for acquiring a standard gamma curve and obtaining the target brightness of the first display sub-region corresponding to the original gray scale mean value on the standard gamma curve. The target gray-scale value calculation module is used for acquiring an actual gamma curve of the first display sub-region and acquiring a target gray-scale value corresponding to the target brightness on the actual gamma curve. The difference value obtaining module is used for obtaining a gray scale difference value of the target gray scale value and the original gray scale mean value, and the gray scale difference value comprises an integer part and a decimal part. The gray scale compensation module is used for performing gray scale compensation on each sub-pixel in the first display sub-area according to a first preset compensation coefficient aiming at the integer part of the gray scale difference value, and the first preset compensation coefficient is an integral multiple of 0.5; and performing gray scale compensation on each sub-pixel in the first display sub-area according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value, wherein the second preset compensation coefficient is not more than 1.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A gray scale compensation method for gray scale compensating an original image of a display area, the display area having a plurality of sub-pixels, the plurality of sub-pixels including a plurality of red sub-pixels, a plurality of green sub-pixels and a plurality of blue sub-pixels, the display area including a plurality of display sub-areas, any of the display sub-areas having a plurality of sub-pixels of a same color, the method comprising:
acquiring original gray scale values of all sub-pixels in a first display sub-area, and obtaining an original gray scale mean value of the first display sub-area according to the original gray scale values of all sub-pixels;
acquiring a standard gamma curve, and acquiring the target brightness of the first display sub-region corresponding to the original gray scale mean value on the standard gamma curve;
acquiring an actual gamma curve of the first display sub-region;
acquiring a target gray-scale value corresponding to the target brightness on the actual gamma curve;
acquiring a gray scale difference value of the target gray scale value and the original gray scale mean value, wherein the gray scale difference value comprises an integer part and a decimal part;
performing gray scale compensation on each sub-pixel in the first display sub-area according to a first preset compensation coefficient aiming at the integer part of the gray scale difference value;
and performing gray scale compensation on each sub-pixel in the first display sub-area according to a second preset compensation coefficient aiming at the decimal part of the gray scale difference value, wherein the gray scale compensation comprises the following steps:
acquiring the numerical value of the decimal part of the gray scale difference value, and judging the magnitude relation between the numerical value of the decimal part of the gray scale difference value and a first preset value;
if the numerical value of the decimal part of the gray scale difference value is smaller than the first preset value, the second preset compensation coefficient is 0;
if the numerical value of the decimal part of the gray scale difference value is larger than or equal to the first preset value, judging the magnitude relation between the numerical value of the decimal part of the gray scale difference value and a second preset value;
if the numerical value of the decimal part of the gray scale difference value is greater than or equal to the first preset value and less than or equal to the second preset value, the second preset compensation coefficient is greater than or equal to 0.3 and less than or equal to 0.7;
and if the numerical value of the decimal part of the gray scale difference value is greater than the second preset value, the second preset compensation coefficient is equal to 1.
2. The gray scale compensation method of claim 1, wherein said obtaining an actual gamma curve of the first display sub-region comprises:
detecting the gray scale mean value of the first display sub-area and the actual brightness mean value corresponding to the gray scale mean value in real time;
and determining an actual gamma curve of the first display sub-region according to the corresponding relation between the gray scale mean value and the actual brightness mean value.
3. The method of claim 1, wherein the obtaining of the target gray scale value corresponding to the target brightness on the actual gamma curve comprises:
and finding a gray scale mean value corresponding to the target brightness on the actual gamma curve of the first display sub-region, and determining the gray scale mean value as the target gray scale value of the first display sub-region for gray scale compensation.
4. The gray scale compensation method of claim 1, wherein said gray scale compensating each sub-pixel in said first display sub-region by a first preset compensation factor for an integer portion of said gray scale difference value comprises:
acquiring the numerical value of the integer part of the gray scale difference value;
and performing gray scale compensation on each sub-pixel in the first display sub-area by taking the numerical value of the integer part of the gray scale difference value as the first preset compensation coefficient.
5. The gray scale compensation method of claim 1 or 4, wherein the first preset compensation factor is an integer multiple of 0.5.
6. The gray scale compensation method of claim 5, wherein said first preset compensation coefficient is an integer.
7. A gray scale compensation apparatus based on the gray scale compensation method of any one of claims 1 to 6, comprising:
the acquisition module is used for acquiring original gray-scale values of all sub-pixels in a first display sub-area and obtaining an original gray-scale mean value of the first display sub-area according to the original gray-scale values of all the sub-pixels;
the target brightness calculation module is used for acquiring a standard gamma curve and obtaining the target brightness of the first display sub-region corresponding to the original gray scale mean value on the standard gamma curve;
the target gray-scale value calculation module is used for acquiring an actual gamma curve of the first display sub-region and acquiring a target gray-scale value corresponding to the target brightness on the actual gamma curve;
a difference value obtaining module, configured to obtain a gray scale difference value between the target gray scale value and the original gray scale mean value, where the gray scale difference value includes an integer part and a decimal part;
the gray scale compensation module is used for performing gray scale compensation on each sub-pixel in the first display sub-area according to a first preset compensation coefficient aiming at the integer part of the gray scale difference value, acquiring the numerical value of the decimal part of the gray scale difference value and judging the size relation between the numerical value of the decimal part of the gray scale difference value and a first preset value; if the numerical value of the decimal part of the gray scale difference value is smaller than the first preset value, the second preset compensation coefficient is 0; if the numerical value of the decimal part of the gray scale difference value is larger than or equal to the first preset value, judging the magnitude relation between the numerical value of the decimal part of the gray scale difference value and a second preset value; if the numerical value of the decimal part of the gray scale difference value is greater than or equal to the first preset value and less than or equal to the second preset value, the second preset compensation coefficient is greater than or equal to 0.3 and less than or equal to 0.7; and if the numerical value of the decimal part of the gray scale difference value is greater than the second preset value, the second preset compensation coefficient is equal to 1.
8. A display module comprising a display panel and a driving device for driving the display panel, further comprising the gray scale compensation device as claimed in claim 7 for performing gray scale compensation on the display image of the display panel.
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