CN111816125B - Display compensation method and device, time sequence controller and display device - Google Patents

Display compensation method and device, time sequence controller and display device Download PDF

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CN111816125B
CN111816125B CN202010792629.XA CN202010792629A CN111816125B CN 111816125 B CN111816125 B CN 111816125B CN 202010792629 A CN202010792629 A CN 202010792629A CN 111816125 B CN111816125 B CN 111816125B
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value
display
function
display device
preset target
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CN111816125A (en
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彭勇
金哲林
吕峰亮
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Hefei Yisiwei Computing Technology Co ltd
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Hefei Eswin IC Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours

Abstract

The embodiment of the invention provides a display compensation method, a display compensation device, a time schedule controller and a display device. The display compensation method comprises the following steps: dividing a preset total display brightness value area of the display device into a plurality of display brightness value areas; acquiring the color coordinates of the maximum color coordinate offset points of any two adjacent display brightness value areas; and determining a display data correction function for performing display compensation in each display brightness value area according to the color coordinate of the preset target value and the color coordinate of the maximum deviation point. The display compensation method provided by the invention can compensate the picture data of the display device through the display data correction function under the conditions of different brightness and different gray scales of the display device, so that the color coordinate of the picture data of the display device becomes smooth, the phenomenon of color cast is avoided, and the quality of the display device is improved.

Description

Display compensation method and device, time sequence controller and display device
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a display compensation method and apparatus, a timing controller, and a display apparatus.
Background
The display nonuniformity of the display device in the prior art is closely related to the manufacturing process, and when the threshold voltage value on the whole panel has large difference, the brightness uniformity of the whole display device is deteriorated; meanwhile, the organic material used also has a problem that the luminance is constantly changed during its own lifetime. This all makes such problems impossible to solve completely only by technological improvements, and only by various compensatory drives. When the gray scale characteristics of panel (panel) data are different under different brightness, the prior art display device debugs and compensates through gamma curves (gamma). But this compensation adjustment can only take a limited Display Brightness Value (DBV) region. That is, gamma between the display luminance value regions is adjusted by the implementation of interpolation of an Integrated Circuit (IC), but the interpolation of the IC encounters a case where the debug value does not match the gray scale characteristic of the panel data.
As shown in fig. 2, the abscissa represents the display luminance value (DBV) and the ordinate represents the luminance, and is exemplified by a display device of the related art. The gray scale characteristics of the display device are different under different brightness (controlled by DBV), so that a plurality of gamma curves need to be debugged. Dividing the whole Display Brightness Value (DBV) of the display device into 10 sections, wherein a point on each Bandwidth (BAND) is the brightness of 255 gray scales under the DBV, and each BAND is provided with a gamma curve of 0-255 gray scales. The gamma curve on each BAND critical value is debugged by an optical device, so the chroma and the brightness are very accurate, but each BAND area is realized by the interpolation realization adjustment of an Integrated Circuit (IC), if the panel characteristic and the interpolation of the integrated circuit are not matched, the gamma curve has deviation, and the deviation is larger when the DBV is smaller.
As also shown in fig. 3, fig. 3 is a color coordinate graph between the portions BAND of fig. 2, wherein the x-curve and the y-curve represent plots of the abscissa and the ordinate of the color coordinate. If the abscissa and the ordinate of the color coordinate of the standard are set to be 0.3 and 0.315, respectively, it is clear from fig. 3 that in the case of DBV 0-100, the difference between the ordinate and 0.315 is large and unstable, and the actual display appears greenish. It follows that it is not reasonable to implement image gray scale output using linear interpolation within an Integrated Circuit (IC).
Disclosure of Invention
Embodiments of the present invention provide a display compensation method, a display compensation device, a timing controller, and a display device, which can perform compensation adjustment on picture data of a panel so as not to cause a picture color cast problem under the conditions of low brightness and low gray scale of a display device.
In order to solve the technical problems, the invention adopts the following technical scheme:
the embodiment of the invention provides a display compensation method, which comprises the following steps:
dividing a preset total display brightness value area of the display device into a plurality of display brightness value areas;
acquiring the color coordinates of the maximum color coordinate offset points of any two adjacent display brightness value areas;
and determining a display data correction function for performing display compensation in each display brightness value area according to the color coordinate of the preset target value and the color coordinate of the maximum deviation point.
Further, the preset total display brightness value area is: 0 to 2n-1; wherein n is the brightness control of the display deviceAnd (5) depth making.
Further, when the first value is greater than the third value, determining a display data modification function for display compensation for each display brightness value region includes:
calculating a first ratio of a difference between the second value and the fourth value to a difference between the first value and the third value;
determining a first function of the coordinates of the preset target value and the coordinates of the maximum deviation point as the display data correction function according to the first ratio, the third value and the fourth value;
the abscissa of the maximum deviation point is a first value, the ordinate of the maximum deviation point is a second value, the abscissa of the preset target value is a third value, and the ordinate of the preset target value is a fourth value.
Further, the first function is represented as: y 1/fourth value (first ratio/fourth value) × (x 1-third value) + 1; the x1 and y1 are the abscissa and ordinate values of any point coordinate between the preset target value and the maximum deviation point.
Further, when the first value is smaller than the third value, determining a display data modification function for display compensation for each display brightness value region includes:
calculating a second ratio of the difference between the fourth value and the second value to the difference between the third value and the first value;
determining a second function of the coordinates of the maximum deviation point and the preset target value as the display data correction function according to the second ratio, the third value and the fourth value;
the abscissa of the maximum deviation point is a first value, the ordinate of the maximum deviation point is a second value, the abscissa of the preset target value is a third value, and the ordinate of the preset target value is a fourth value.
Further, the second function is represented as: y 2/fourth value (second ratio/fourth value) (-third value-x 2) + 1; the x2 and y2 are the abscissa and ordinate values of any point coordinate between the maximum deviation point and the preset target value.
The embodiment of the invention also provides a display compensation method, which comprises the following steps:
performing primary fitting on input image data by adopting a display data correction function to obtain image data subjected to primary fitting, and adjusting the difference value of the image data subjected to primary fitting;
wherein, the display data correction function is obtained by adopting the method.
Further, the display compensation method further includes:
performing second fitting adjustment on the input image data according to the display data correction function and the pre-display gray scale;
wherein, the display data correction function is obtained by adopting the method.
Further, the display compensation method further includes:
if the gray scale of the input image data is smaller than the first gray scale or larger than the second gray scale, the difference value of the image data is not adjusted;
and if the gray scale of the input image data is greater than or equal to the first gray scale and less than or equal to the second gray scale, adjusting the difference value of the image data according to the pre-display gray scale offset and the display device.
An embodiment of the present invention further provides a display compensation apparatus, including:
the display device comprises a dividing module, a display brightness value judging module and a display brightness value judging module, wherein the dividing module is used for dividing a preset total display brightness value area of the display device into a plurality of display brightness value areas;
the acquisition module is used for acquiring the color coordinates of the maximum color coordinate offset points of any two adjacent display brightness value areas;
and the determining module is used for determining a display data correction function for performing display compensation in each display brightness value area according to the color coordinate of the preset target value and the color coordinate of the maximum deviation point.
An embodiment of the present invention further provides a timing controller, including:
the first processing module is used for performing primary fitting on input image data by adopting a display data correction function to obtain image data subjected to primary fitting, and adjusting the difference value of the image data subjected to primary fitting;
wherein, the display data correction function is obtained by adopting the method.
Further, the timing controller further includes:
the second processing module is used for performing second fitting adjustment on the input image data according to the display data correction function and the pre-display gray scale;
wherein, the display data correction function is obtained by adopting the method.
The embodiment of the invention also provides a display device, which comprises the time schedule controller, wherein the display device is an active matrix organic light emitting diode display device.
The invention has the beneficial effects that:
the embodiment of the invention provides a display compensation method, a display compensation device, a time schedule controller and a display device. The display compensation method comprises the following steps: dividing a preset total display brightness value area of the display device into a plurality of display brightness value areas; acquiring the color coordinates of the maximum color coordinate offset points of any two adjacent display brightness value areas; and determining a display data correction function for performing display compensation in each display brightness value area according to the color coordinate of the preset target value and the color coordinate of the maximum deviation point. The display compensation method provided by the invention can compensate the picture data of the display device through the display data correction function under the conditions of different brightness and different gray scales of the display device, thereby avoiding the situation that the correction value is not matched with the characteristic of the panel of the display device when the picture image is corrected; the invention also smoothes the color coordinate of the picture data of the display device, avoids the occurrence of color cast and improves the quality of the display device.
Drawings
FIG. 1 is a flow chart of a display compensation method according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a structure of a luminance-display luminance value according to the prior art;
FIG. 3 is a diagram of a prior art color coordinate-display luminance value image;
FIG. 4 is a diagram illustrating a color coordinate-display luminance value function provided by an embodiment of the present invention;
FIG. 5 is a second schematic diagram of a color coordinate-display luminance value function provided by an embodiment of the present invention;
FIG. 6 is a second flowchart illustrating a display compensation method according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an image after 32-gray level image compensation according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of an image compensated for different gray levels according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a timing controller according to an embodiment of the present invention;
fig. 10 is a second schematic diagram illustrating a timing controller according to an embodiment of the invention;
fig. 11 is a third schematic structural diagram of a timing controller according to an embodiment of the invention;
fig. 12 is a fourth schematic structural diagram of the timing controller according to the embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The invention provides a display compensation method, a display compensation device, a time schedule controller and a display device, aiming at the problem that under the conditions of low brightness and low gray scale of a display device, the color cast of a picture is easy to occur.
As shown in fig. 1, an alternative embodiment of the present invention provides a display compensation method, including:
step 100, dividing a preset total display brightness value area of a display device into a plurality of Display Brightness Value (DBV) areas;
specifically, the preset total display brightness value area is: 0 to 2n-1; wherein n is the brightness control depth of the display device.
200, acquiring color coordinates of the maximum color coordinate offset points of any two adjacent display brightness value areas;
and step 300, determining a display data correction function for performing display compensation in each display brightness value area according to the color coordinates of the preset target value and the color coordinates of the maximum deviation point.
The display compensation method provided by the invention can compensate the picture data of the display device through the display data correction function under the conditions of different brightness and different gray scales of the display device, and avoids the situation that the correction value is not matched with the characteristic of the panel of the display device when the picture image is corrected.
Specifically, in step 100, when the brightness control depth of the display device is 12 bits, that is, the total display brightness value area is: 0 to 4095, and of course, there are also cases where the luminance control depth is 10 bits, that is, the total display luminance value area is: 0 to 1023. This embodiment is described with a brightness control depth of 12 bits. With the above display compensation method, the preset total display luminance value region (0 to 4095) of the display device is divided into a plurality of display luminance value regions, and here, the analysis is performed by dividing 10 regions, but of course, a plurality of regions may be other integers. The division of 0-4095 into BAND 1-BAND 10 is completed the division of multiple DBV regions.
After dividing the DBV areas, the color coordinates of the maximum color coordinate offset points of any two adjacent display brightness value areas can be obtained, and a display data correction function is determined. The uncompensated state of the display device may specifically include an initial state when the display device is powered on for the first time, or may also be a test state for compensating brightness, which is manually set according to actual needs of a user during the use of the display device. In order to intuitively and accurately acquire the brightness difference condition of each pixel in the display device, the embodiment of the invention mainly adopts the color coordinates in the picture.
The color coordinates here are a display screen in which all pixels of the display device display the same color. For example, the full-white test frame may be specifically included, or the full-color test frame may further include a full-red test frame, a full-green test frame, and a full-blue test frame, respectively. Ideally, the brightness of the color displayed by each pixel in the image should be equal to a preset brightness gray scale, wherein the preset brightness gray scale can be freely selected according to actual needs, and since the 8-bit gray scale range is usually 0 to 255, wherein 0 is darkest and 255 is brightest, in order to facilitate observation, in the embodiment of the present invention, the brightness gray scale of the full-color test picture may be preferably tested as 255 gray scales.
Further, as shown in fig. 4, the abscissa represents a display luminance value (DBV), and the ordinate is a color coordinate. By analyzing the divided adjacent two BANDs 1 and2, in step 200, the color coordinates (x0, y0) of the point where the color coordinates of BAND1 and BAND2 are most shifted are obtained. In conjunction with the color coordinates of the target values preset in step 300, a display data modification function for display compensation may be determined for each display luminance value region.
Specifically, when the first value x0 is greater than the third value xa, determining the display data modification function for display compensation for each display luminance value region includes:
calculating a first ratio of the difference between the second value y0 and the fourth value ya to the difference between the first value x0 and the third value xa;
determining a first function of the color coordinates of the preset target value and the color coordinates of the maximum deviation point as the display data correction function according to the first ratio, the third value xa, and the fourth value ya;
the abscissa of the maximum deviation point is a first value x0, the ordinate of the maximum deviation point is a second value y0, the abscissa of the preset target value is a third value xa, and the ordinate of the preset target value is a fourth value ya.
This parabola is shown in fig. 4 as xa to x0, and in this embodiment, the color coordinates (xa, ya) and (x0, y0) of the preset target value are selected, a linear function of the rising state is calculated at two points, and a linear function is calculated at two points, by which a display data correction function for performing display compensation is expressed for each display luminance value region when the first value x0 is greater than the third value xa. By calculating the first ratio (y0-ya)/(x0-xa), and the color coordinates (xa, ya) of a known preset target value, a specific ascending linear function can be obtained. I.e. the ascending linear function is: y1 (first ratio) (x-xa) + ya.
Namely, it is
Figure BDA0002624387630000071
Specifically, the first color coordinate shift function f (x1) is expressed as: y 1/fourth value (first ratio/fourth value) × (x 1-third value) + 1; the x1 and y1 are the abscissa and ordinate values of any point coordinate between the preset target value and the maximum deviation point. That is, the first color coordinate shift function is a rising linear function/ya. The first color coordinate shift function f (x1) represents the relative amount of change of ya and y 0.
Namely, it is
Figure BDA0002624387630000072
It should be noted that, if the image is directly compensated by the deviation obtained by the test through the first color coordinate shift function, the compensated linear image in fig. 5 is obtained. This function is the first function in the opposite state to the above-mentioned ascending linear function, and the first function is obtained by two coordinate points (xa, yc) and (x0, yd) in fig. 5, where yc after compensation is a point on the same ordinate as y0, and yd is a point on the same ordinate as ya. The first function y' (x1) can be obtained by compensating the image by the first color coordinate shift function.
Figure BDA0002624387630000081
In another embodiment, when the first value x0 is smaller than the third value xb, determining the display data modification function for display compensation for each display brightness value region includes:
calculating a second ratio of the difference between the fourth value yb and the second value y0 to the difference between the third value xb and the first value x 0;
determining a second function of the coordinates of the maximum deviation point and the preset target value as the display data correction function according to the second ratio, the third value xb and the fourth value yb;
the abscissa of the maximum deviation point is a first value x0, the ordinate of the maximum deviation point is a second value y0, the abscissa of the preset target value is a third value xb, and the ordinate of the preset target value is a fourth value yb.
This parabola, which is in the falling state, can be seen from x0 to xb in fig. 4, and in this embodiment, the color coordinates (xb, yb) and (x0, y0) of the preset target value are selected, a linear function of the falling state is calculated at two points, and a linear function is calculated at two points, by which a display data correction function for performing display compensation for each display luminance value region when the first value x0 is smaller than the third value xb can be expressed. By calculating the second ratio (yb-y0)/(xb-x0), and the color coordinates (xb, yb) for a known preset target value, a specific decreasing linear function can be obtained. I.e. the decreasing linear function is: y is the second ratio (x-xb) + yb.
Namely, it is
Figure BDA0002624387630000082
Specifically, the second color coordinate shift function f (x2) is expressed as: y 2/fourth value (second ratio/fourth value) × (x 1-fourth value) + 1; the x2 and y2 are the abscissa and ordinate values of any point coordinate between the preset target value and the maximum deviation point. That is, the second color coordinate shift function f (x2) is a decreasing linear function/yb. The second function represents the relative amount of change in yb and y 0.
Namely, it is
Figure BDA0002624387630000083
Note that, if the deviation obtained by the test is directly compensated for by the second color coordinate shift function, the compensated linear image in fig. 5 is obtained. This function is a second function in a state just opposite to the second color coordinate shift function f (x2), and two coordinate points obtain a rising linear function through coordinates (xb, yc) and (x0, yd) in fig. 5, where yc after compensation is a point on the same ordinate as y0, and yd is a point on the same ordinate as yb. The second function y' (x) can be obtained by compensating the image by the first color coordinate shift function.
Figure BDA0002624387630000091
In summary, the embodiment of the present invention can substitute the color coordinates of any point in the total display luminance value region by the display data modification function, such as y '(x 1) or y' (x2), to perform compensation adjustment on the input image data, so as to avoid the occurrence of color cast in the case of low luminance and low gray scale of the display device.
As shown in fig. 6, an alternative embodiment of the present invention provides a display compensation method, including:
step 400, performing primary fitting on input image data by adopting a display data correction function to obtain image data subjected to primary fitting, and adjusting the difference value of the image data subjected to primary fitting;
wherein, the display data correction function is obtained by adopting the method.
In this embodiment, the display data correction function determined by the method described above is used, and the first fitting process is performed on the input image data including at least the display luminance value and the image pixel data by using the display data correction function, that is, any two points having different x values are clustered by using a polynomial whose degree of determination is not more than 1 for y '(x 1) or y' (x 2).
In this embodiment, if y0 and yc in y '(x 1) or y' (x2) satisfy a linear relationship, then y0 is i yc + j; where i and j are both constants, then y "(x 1) can be expressed as:
Figure BDA0002624387630000092
specifically, the display compensation method further includes:
if the gray scale of the input image data is smaller than the first gray scale or larger than the second gray scale, the difference value of the image data is not adjusted;
and if the gray scale of the input image data is greater than or equal to the first gray scale and less than or equal to the second gray scale, adjusting the difference value of the image data according to the pre-display gray scale offset and the display device.
It should be noted that, when the first gray scale is preset to 7 gray scales, and the second gray scale is preset to 128 gray scales, that is, the first gray scale is smaller than 7 gray scales, or larger than 128 gray scales, the difference value of the image data is not adjusted.
If the gray level of the image data is between 7 gray levels and more than 128 gray levels, the pre-display gray level offset can be selected to be compensated and adjusted by y '(x 1) or y' (x2), and of course, any one of the fixed gray levels from 7 gray levels to more than 128 gray levels can be preset to be compensated and adjusted.
Further, it can be seen from fig. 7 that the y coordinate of the color coordinate after 32 gray level compensation tends to be smoother than the color coordinate before compensation, and is closer to the preset standard value of 0.315. It can be seen from fig. 8 that the color coordinates of different gray scales are cheap and may be different, so that the compensation adjustment can be performed between 7 gray scales and more than 128 gray scales one by adopting the above method.
Further, the pixel value for compensation adjustment may be set to be a fixed pixel value of a gray scale, for example, the gray scales corresponding to all adjustment frames may be set to be 32 gray scales or 48 gray scales, which is not limited in the present invention. Of course, in order to reduce the influence of the picture on the display frame, the compensation adjustment value of the picture may be set as the gray-scale value of each pixel corresponding to the preset range of the compensation adjustment picture.
Specifically, the display compensation method further includes:
500, performing second fitting adjustment on input image data according to the display data correction function and the pre-display gray scale;
wherein, the display data correction function is obtained by adopting the method.
According to the invention, the second fitting compensation is carried out on the picture data of the display device through the display data correction function, so that the situation that the correction value is not matched with the characteristic of the panel of the display device when the picture image is corrected is avoided.
It should be noted that, as mentioned above, the fitting here refers to the second linear fitting, that is, the gray-scale variable of the image itself is brought into the correction function. The first fitting, i.e. the first correction function, does not add gray-scale variations to the image itself.
It should also be noted that the fitting here may also be a quadratic fit, which is a curve fit. According to the invention, through the display compensation method, a quadratic fitting image can be obtained, images shown in fig. 11 and fig. 12 are obtained through a time schedule controller, the image of fig. 11 is not added with the image gray scale variable, and the image of fig. 12 is added with the image gray scale variable.
An embodiment of the present invention further provides a display compensation apparatus, including:
the display device comprises a dividing module, a display brightness value judging module and a display brightness value judging module, wherein the dividing module is used for dividing a preset total display brightness value area of the display device into a plurality of display brightness value areas;
the acquisition module is used for acquiring the color coordinates of the maximum color coordinate offset points of any two adjacent display brightness value areas;
and the determining module is used for determining a display data correction function for performing display compensation in each display brightness value area according to the color coordinate of the preset target value and the color coordinate of the maximum deviation point.
It should be noted that the preset total display brightness value area is: 0 to 2n-1; wherein n is the brightness control depth of the display device.
Further, the determining module includes:
a first calculation unit configured to calculate a first ratio of a difference between the second value and the fourth value to a difference between the first value and the third value;
a first determining unit, configured to determine, according to the first ratio, the third value, and the fourth value, a first function of a coordinate of the preset target value and a coordinate of the maximum deviation point as the display data correction function;
the abscissa of the maximum deviation point is a first value, the ordinate of the maximum deviation point is a second value, the abscissa of the preset target value is a third value, and the ordinate of the preset target value is a fourth value.
It should be noted that, the first function is expressed as: y 1/fourth value (first ratio/fourth value) × (x 1-third value) + 1; the x1 and y1 are the abscissa and ordinate values of any point coordinate between the preset target value and the maximum deviation point.
Further, the determining module further comprises:
a second calculation unit configured to calculate a second ratio of a difference between the fourth value and the second value to a difference between the third value and the first value;
a second determining unit, configured to determine, according to the second ratio, the third value, and the fourth value, a second function of the coordinates of the maximum deviation point and the preset target value as the display data correction function;
the abscissa of the maximum deviation point is a first value, the ordinate of the maximum deviation point is a second value, the abscissa of the preset target value is a third value, and the ordinate of the preset target value is a fourth value.
It should be noted that the second function is expressed as: y 2/fourth value (second ratio/fourth value) (-third value-x 2) + 1; the x2 and y2 are the abscissa and ordinate values of any point coordinate between the maximum deviation point and the preset target value.
An embodiment of the present invention further provides a timing controller, including:
the first processing module is used for performing primary fitting on the input image data by adopting a display data correction function to obtain image data subjected to primary fitting;
wherein, the display data correction function is obtained by adopting the method.
Further, the timing controller further includes:
the second processing module is used for performing second fitting adjustment on the difference value of the input image data according to the display data correction function and the pre-display gray scale;
wherein, the display data correction function is obtained by adopting the method.
It should be noted that, if the gray scale of the input image data is smaller than the first gray scale or larger than the second gray scale, the difference value of the image data is not adjusted;
and if the gray scale of the input image data is greater than or equal to the first gray scale and less than or equal to the second gray scale, adjusting the difference value of the image data according to the pre-display gray scale offset and the display device.
Note that, In the timing controller, the input Data (Data In and DBV In) is adjusted by the adder and multiplier shown In fig. 9, and the formula of the first-order fit is:
Dataout＝a·Data+b；
y' (x1) can be expressed by a one-time fitting formula, where a and b are both constants.
Of course, the input Data (Data In and DBV In) can also be adjusted by the adder and multiplier In fig. 10, and the formula of the first fit is:
Dataout＝a′·Data+b′；
y ' (x2) can be expressed by a one-time fit formula, where a ' and b ' represent both constants.
It should be noted that, as mentioned above, the fitting here refers to the second linear fitting, that is, the gray-scale variable of the image itself is brought into the correction function. The first fitting, i.e. the first correction function, does not add gray-scale variations to the image itself.
Similarly, the input Data (Data In and DBV In) are adjusted by the adder and multiplier shown In fig. 11, and the formula of quadratic fit is:
Dataout＝a·Data2+b·Data+c＝Data·(a·Data+b)+c；
the formula can be expressed by a quadratic fit as y "(x 1), where a, b, and c are all expressed as constants.
Similarly, the input Data (Data In and DBV In) are adjusted by the adder and multiplier shown In fig. 12, and the formula of quadratic fit is:
Dataout＝a′·Data2+b′·Data+e＝Data·(a′·Data+b′)+c′；
the formula can be expressed as y "(x 2) by a quadratic fit, where a", b ", and c" are all expressed as constants.
It should also be noted that the fitting here may also be a quadratic fit, which is a curve fit. According to the invention, through the display compensation method, a quadratic fitting image can be obtained, images shown in fig. 11 and fig. 12 are obtained through a time schedule controller, the image of fig. 11 is not added with the image gray scale variable, and the image of fig. 12 is added with the image gray scale variable.
Of course, when multiple fits occur, the number of adders and multipliers in the timing controller can be increased.
The time sequence controller of the present invention may be a time sequence controller separately arranged from the integrated circuit on the notebook computer and the television, or may be a time sequence controller integrated with the integrated circuit on the mobile phone, which is not limited herein.
An embodiment of the present invention further provides a display device, including the above timing controller, wherein the display device is an Active Matrix (AMOLED).
The embodiment of the invention adopts the display compensation method and can be applied to various known display devices. Particularly, in the case of the AMOLED display device, due to limitations of the AMOLED display device crystallization process and the fabrication level, non-uniformity of electrical parameters such as threshold voltage, mobility, etc. of a Thin Film Transistor (TFT) switching circuit fabricated on a large-area glass substrate often occurs, so that threshold voltage shifts of the respective TFTs are not uniform, which causes current differences and luminance differences of the organic light emitting diode display device to be perceived by human eyes, thereby causing a problem of non-uniformity of display effect among pixels. Even if the same gray scale is confirmed in all pixels, the luminance among the pixels is not uniform due to the non-uniformity among the pixels. The display compensation method provided by the embodiment of the invention is particularly obvious for improving the problems.
It should be noted that, in this document, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims (11)

1. A display compensation method, comprising:
dividing a preset total display brightness value area of the display device into a plurality of display brightness value areas;
acquiring the color coordinates of the maximum color coordinate offset points of any two adjacent display brightness value areas;
determining a display data correction function for performing display compensation in each display brightness value area according to the color coordinates of a preset target value and the color coordinates of the maximum deviation point;
wherein, when the first value is greater than the third value, the step of determining the display data modification function for display compensation of each display brightness value region includes:
calculating a first ratio of a difference between the second value and the fourth value to a difference between the first value and the third value;
determining a first function of the coordinates of the preset target value and the coordinates of the maximum deviation point as the display data correction function according to the first ratio, the third value and the fourth value;
when the first value is smaller than the third value, the step of determining the display data modification function for display compensation of each display brightness value area includes:
calculating a difference between a fourth value and a second value, and a second ratio of the difference between the third value and the first value;
determining a second function of the coordinates of the maximum deviation point and the preset target value as the display data correction function according to the second ratio, the third value and the fourth value;
the abscissa of the maximum deviation point is a first value, the ordinate of the maximum deviation point is a second value, the abscissa of the preset target value is a third value, and the ordinate of the preset target value is a fourth value.
2. The display compensation method of claim 1, wherein the preset total display brightness value region is: 0 to 2n-1; wherein n is the brightness control depth of the display device.
3. The display compensation method of claim 1, wherein the first function is represented as: y 1/fourth value (first ratio/fourth value) × (x 1-third value) + 1; the x1 and y1 are the abscissa and ordinate values of any point coordinate between the preset target value and the maximum deviation point.
4. The display compensation method of claim 1, wherein the second function is represented as: y 2/fourth value (second ratio/fourth value) (-third value-x 2) + 1; the x2 and y2 are the abscissa and ordinate values of any point coordinate between the maximum deviation point and the preset target value.
5. A display compensation method, comprising:
performing primary fitting on input image data by adopting a display data correction function to obtain image data subjected to primary fitting, and adjusting the difference value of the image data subjected to primary fitting;
wherein the display data modification function is obtained using the method of any one of claims 1-4.
6. The display compensation method of claim 5, further comprising:
and performing second fitting adjustment on the input image data according to the display data correction function and the pre-display gray scale.
7. The display compensation method of claim 5, further comprising:
if the gray scale of the input image data is smaller than the first gray scale or larger than the second gray scale, the difference value of the image data is not adjusted;
and if the gray scale of the input image data is greater than or equal to the first gray scale and less than or equal to the second gray scale, adjusting the difference value of the image data according to the pre-display gray scale offset and the display device.
8. A display compensation apparatus, comprising:
the display device comprises a dividing module, a display brightness value judging module and a display brightness value judging module, wherein the dividing module is used for dividing a preset total display brightness value area of the display device into a plurality of display brightness value areas;
the acquisition module is used for acquiring the color coordinates of the maximum color coordinate offset points of any two adjacent display brightness value areas;
the determining module is used for determining a display data correction function for performing display compensation in each display brightness value area according to the color coordinate of a preset target value and the color coordinate of the maximum deviation point;
wherein the determining module comprises:
a first calculation unit for calculating a first ratio of a difference between the second value and the fourth value to a difference between the first value and the third value;
a first determining unit, configured to determine, according to the first ratio, the third value, and the fourth value, a first function of a coordinate of the preset target value and a coordinate of the maximum deviation point as the display data correction function;
wherein the determining module further comprises:
a second calculation unit configured to calculate a second ratio of a difference between the fourth value and the second value to a difference between the third value and the first value;
a second determining unit, configured to determine, according to the second ratio, the third value, and the fourth value, a second function of the coordinates of the maximum deviation point and the preset target value as the display data correction function;
the abscissa of the maximum deviation point is a first value, the ordinate of the maximum deviation point is a second value, the abscissa of the preset target value is a third value, and the ordinate of the preset target value is a fourth value.
9. A timing controller, comprising:
the first processing module is used for performing primary fitting on input image data by adopting a display data correction function to obtain image data subjected to primary fitting, and adjusting the difference value of the image data subjected to primary fitting;
wherein the display data modification function is obtained using the method of any one of claims 1-4.
10. The timing controller of claim 9, further comprising:
and the second processing module is used for performing second fitting adjustment on the input image data according to the display data correction function and the pre-display gray scale.
11. A display device comprising the timing controller of any one of claims 9 to 10, wherein the display device is an active matrix organic light emitting diode display device.
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