CN112908257A - Compensation method, device and system for display panel - Google Patents
Compensation method, device and system for display panel Download PDFInfo
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- CN112908257A CN112908257A CN202110221164.7A CN202110221164A CN112908257A CN 112908257 A CN112908257 A CN 112908257A CN 202110221164 A CN202110221164 A CN 202110221164A CN 112908257 A CN112908257 A CN 112908257A
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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]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
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Abstract
The embodiment of the invention discloses a compensation method, a device and a system of a display panel. The compensation method of the display panel comprises the following steps: determining compensation gray scales corresponding to a plurality of different display gray scales of the sub-pixels; the display panel comprises a plurality of sub-pixels; establishing a fitting function between the display gray scale and the compensation gray scale according to the plurality of display gray scales and the compensation gray scale; carrying out partial differential processing on the fitting function to determine a solving formula of each coefficient of the fitting function; determining the coefficient of the fitting function by adopting an iterative algorithm according to the solving formula and the set precision value; storing the determined fitting function in a display panel, so that the display panel compensates each sub-pixel according to the fitting function. The scheme of the embodiment of the invention improves the compensation precision of the display panel and reduces the brightness deviation, thereby improving the display effect of the display panel.
Description
Technical Field
Embodiments of the present invention relate to display technologies, and in particular, to a compensation method, device, and system for a display panel.
Background
An Organic Light Emitting Diode (OLED) display panel is a self-luminous display panel, and compared with a Liquid Crystal Display (LCD) panel, the OLED display panel does not need a backlight source, so that the OLED display panel is thinner and lighter.
However, the conventional OLED display panel is prone to brightness deviation, which results in poor display effect of the OLED display panel.
Disclosure of Invention
The invention provides a compensation method, a device and a system of a display panel, which are used for improving the compensation precision of the display panel and reducing the brightness deviation so as to improve the display effect of the display panel.
In a first aspect, an embodiment of the present invention provides a compensation method for a display panel, including:
determining compensation gray scales corresponding to a plurality of different display gray scales of the sub-pixels; the display panel comprises a plurality of sub-pixels;
establishing a fitting function between the display gray scale and the compensation gray scale according to the plurality of display gray scales and the compensation gray scale;
carrying out partial differential processing on the fitting function to determine a solving formula of each coefficient of the fitting function;
determining the coefficient of the fitting function by adopting an iterative algorithm according to the solving formula and the set precision value of each coefficient;
storing the determined fitting function in a display panel, so that the display panel compensates each sub-pixel according to the fitting function.
Optionally, the fitting function of the display gray scale and the compensation gray scale is y (xi) ═ b0+b1xi+b2xi2Wherein xi is the ith display gray scale, and b0, b1 and b2 are real numbers;
the method for determining the solving formula of each coefficient of the fitting function by carrying out partial differential processing on the fitting function comprises the following steps:
is provided with
Wherein n is a positive integer, yi is a compensation gray scale corresponding to xi;
partial differentiation of Q with respect to b0, b1, and b2 was found to solve the equations for b0, b1, and b2, respectively:
optionally, determining the coefficient of the fitting function by using an iterative algorithm according to the solving formula and the set precision value of each coefficient, including:
using the set initial values of b0, b1 and b2 to obtain intermediate values of b0, b1 and b2 according to an iterative algorithm;
when the intermediate value and the set precision value satisfy the set relationship, the values of b0, b1, and b2 are determined according to the intermediate value.
Optionally, when the intermediate value satisfies the set precision value, determining the coefficient of the fitting function according to the intermediate value includes:
the intermediate value comprises b0 obtained in the current iteration1B0 obtained in the previous iteration2B1 obtained in the current iteration1B1 obtained in the previous iteration2B2 obtained in the current iteration1And b2 obtained from the previous iteration2；
Is provided with
And
b0 from the iteration when z0 < N, z1 < N and z2 < N1、b11And b21Determining the values of b0, b1, and b 2; wherein N is a set precision value.
Optionally, determining the compensation gray scales corresponding to a plurality of different display gray scales of the sub-pixels includes:
acquiring actual display brightness of a sub-pixel when the sub-pixel displays a plurality of different display gray scales;
and determining the compensation gray scales corresponding to the different display gray scales according to the actual display brightness and the target brightness.
Optionally, the target display brightness is an average brightness of a set region where the sub-pixel is located.
In a second aspect, an embodiment of the present invention further provides a compensation apparatus for a display panel, including:
the compensation gray scale determining module is used for determining the compensation gray scales corresponding to a plurality of different display gray scales of the sub-pixels; the display panel comprises a plurality of sub-pixels;
the fitting function establishing module is used for establishing a fitting function between the display gray scale and the compensation gray scale according to the display gray scales and the compensation gray scales;
the solving formula determining module is used for carrying out partial differential processing on the fitting function to determine solving formulas of all coefficients of the fitting function;
the coefficient determining module is used for determining the coefficient of the fitting function by adopting an iterative algorithm according to the solving formula and the set precision value of each coefficient;
and the fitting function storage module is used for storing the determined fitting function in the display panel so that the display panel compensates each sub-pixel according to the fitting function.
Optionally, the fitting function of the display gray scale and the compensation gray scale is y (xi) ═ b0+b1xi+b2xi2(ii) a Wherein xi is the ith display gray scale, and b0, b1 and b2 are real numbers;
the solution formula determination module is specifically configured to:
is provided with
Wherein n is a positive integer, yi is a compensation gray scale corresponding to xi;
partial differentiation of Q with respect to b0, b1, and b2 was found to solve the equations for b0, b1, and b2, respectively:
optionally, the coefficient determining module includes:
the intermediate value determining unit is used for calculating intermediate values of b0, b1 and b2 according to an iterative algorithm by adopting set initial values of b0, b1 and b 2;
and a coefficient determining unit for determining values of b0, b1 and b2 according to the intermediate value when the intermediate value and the setting precision value satisfy a setting relationship.
In a third aspect, an embodiment of the present invention further provides a compensation system for a display panel, including a display panel and a compensation apparatus for a display panel according to any embodiment of the present invention.
The embodiment of the invention determines the solving formula of the coefficient of the fitting function by adopting a differential processing mode, calculates the coefficient value of the fitting function according to the solving formula and an iterative algorithm, and determines the calculated coefficient as the final coefficient value when the calculated coefficient value and the set precision value meet the set relation.
Drawings
FIG. 1 is a flowchart illustrating a compensation method for a display panel according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a corresponding relationship curve between a display gray scale and a compensation gray scale according to an embodiment of the present invention;
FIG. 3 is a comparison graph of the corresponding relationship between the display gray scale and the compensation gray scale according to the embodiment of the present invention;
FIG. 4 is a view illustrating compensation visual effect of the display panel obtained by compensating the compensation gray scale obtained by the fitting function of the present embodiment at the gray scale of 16;
FIG. 5 is a view illustrating compensation of a display panel obtained by compensating for a compensation gray level obtained by a fitting function obtained by a least square method at a gray level of 16;
FIG. 6 is a difference plot of the compensated visual effects plot of FIG. 4 and the compensated visual effects plot of FIG. 5;
FIG. 7 is a difference value diagram between the compensation visual effect diagram of the method of the present embodiment and the compensation visual effect diagram of the least square method at 32 gray levels;
fig. 8 is a structural diagram of a compensation apparatus of a display panel according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a compensation system of a display panel according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The existing OLED display panel is easy to have brightness deviation, so that the display effect of the OLED display panel is poor. In the compensation mode in the prior art, compensation gray scales corresponding to a plurality of gray scales are usually stored in a display panel, interpolation operation is performed according to the stored compensation gray scales when the display panel displays a picture to obtain the compensation gray scale of each gray scale, and brightness compensation is performed according to the compensation gray scales; or fitting a corresponding function of the compensation gray scale and the gray scale according to the plurality of gray scales and the compensation gray scale, storing the coefficient of the corresponding function in the display panel, calculating the compensation gray scale of each gray scale according to the corresponding function when the display panel displays, and performing brightness compensation according to the compensation gray scale. However, the compensation gray scale obtained by the existing interpolation operation or fitting method has larger difference with the actually required compensation gray scale, and the compensation effect is not ideal.
Based on the above problems, the present application provides the following solutions:
fig. 1 is a flowchart of a compensation method for a display panel according to an embodiment of the present invention, and referring to fig. 1, the method includes:
s110, determining a set compensation gray scale corresponding to a plurality of different set display gray scales of the sub-pixels; the display panel comprises a plurality of sub-pixels.
Specifically, the display panel may include a plurality of sub-pixels of different colors, and may illustratively include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The compensation gray scales corresponding to the plurality of display gray scales can be calculated for each sub-pixel. The number of the plurality of different display gray scales can be set according to needs, and can be more than or equal to 3 exemplarily. The display gray levels may include gray levels of 16, 32, 64, 128, 224, 255, etc. In addition, the number of the set display gray scales in the low gray scale region may be greater than the number of the set display gray scales in the high gray scale region, for example, if the low gray scale region is smaller than 128, the number of the gray scales smaller than 128 is greater than the number of the gray scales larger than 128, thereby improving the compensation accuracy of the low gray scale region.
S120, establishing a fitting function between the display gray scale and the compensation gray scale according to the display gray scales and the compensation gray scales.
Specifically, a relation curve of the display gray scale and the compensation gray scale may be drawn, and the type of the fitting function may be determined according to the shape of the relation curve, and the exemplary fitting function may be a quadratic function, a cubic function, or the like. The type of the fitting function is not particularly limited in this embodiment, and the fitting function may be determined according to the actual shape of the relationship curve.
And S130, carrying out partial differential processing on the fitting function to determine a solving formula of each coefficient of the fitting function.
Specifically, the partial differentiation process is to preprocess the fitting function and then obtain partial differentiation with respect to each coefficient of the fitting function. The preprocessing comprises calculating a fitting function corresponding to the display gray scale xi and corresponding to xiIs the even power [ y (xi) -yi of the difference of the actually calculated compensation gray-scale yi]2mM is greater than or equal to 1; exemplary calculation of the square difference [ y (xi) -yi ] between the fitting function y (xi) corresponding to the display gray scale xi and the actually calculated compensation gray scale yi corresponding to xi]2Then, the first display gray scale x1, the second display gray scale x2 … … and the nth display gray scale xn are mapped to [ y (xi) -yi [ ]]2mAre summed to obtain
Order to
0. After pretreatment, the method is used for obtaining
And determining a solving formula of each coefficient according to the partial differential result relative to the partial differential of each coefficient of the fitting function.
Due to the fact that
When equal to 0, the fitting function y (xi) is closest to yi by letting
Post-evaluation
And determining a solving formula of each coefficient of the fitting function according to the partial differential relative to the partial differential of each coefficient of the fitting function, wherein each coefficient obtained according to the solving formula is more in line with the actual corresponding relation between the display gray scale and the compensation gray scale.
And S140, determining the coefficient of the fitting function by adopting an iterative algorithm according to the solving formula and the set precision value of each coefficient.
Specifically, (x1, y1), (x2, y2) … … (xn, yn) are substituted into the solving formulas of b0, b1 and b2, and then the final coefficient of the fitting function is obtained by adopting an algorithm such as an iterative algorithm. For example, an initial value may be set for b1 and b2, b0 may be obtained, b1 may be obtained from the obtained b0 value and the initial value of b2, b2 may be obtained from the obtained b1 value and b0 value, b0 may be obtained from the obtained b1 value and b2 value, and so on, a first difference may be obtained by subtracting the obtained b0 from the previously obtained b0 value, a second difference may be obtained by subtracting the obtained b1 from the previously obtained b1 value, a third difference may be obtained by subtracting the obtained b2 from the previously obtained b2 value, and when the obtained first difference, second difference, and third difference and the set precision value in at least one iteration successively satisfy the set relationship, the finally obtained b0, b1, and b2 may be determined as the final coefficient of the fitting function. Iterative solution is carried out on the solving formula by adopting an iterative algorithm, and the coefficient value obtained by iteration is verified by adopting a set precision value, so that the precision of the coefficient value is controllable, the obtained coefficient can be ensured to have higher precision, the fitting function has higher fitting precision, the fitting function is ensured to be more in line with the actual corresponding relation between the display gray scale and the compensation gray scale, and the compensation effect of the display panel is improved.
S150, storing the determined fitting function in a display panel, so that the display panel compensates each sub-pixel according to the fitting function.
Specifically, after determining each coefficient of the fitting function, the fitting function is determined, the fitting function may be burned into the display panel, when each sub-pixel of the display panel displays a gray scale to be displayed, a compensation gray scale corresponding to the gray scale to be displayed is determined according to the fitting function corresponding to the sub-pixel, and the sub-pixel is compensated according to the compensation gray scale.
The embodiment determines a solving formula of a coefficient of a fitting function by adopting a differential processing mode, calculates a coefficient value of the fitting function according to the solving formula and an iterative algorithm, and determines the calculated coefficient as a final coefficient value when the calculated coefficient value and a set precision value meet a set relation.
The partial differentiation process is explained below by taking the fitting function as a quadratic function as an example:
optionally, the fitting function of the display gray scale and the compensation gray scale is y (xi) ═ b0+b1xi+b2xi2(ii) a Wherein xi is the ith display gray scale, and b0, b1 and b2 are real numbers;
the method for determining the solving formula of each coefficient of the fitting function by carrying out partial differential processing on the fitting function comprises the following steps:
is provided with
Wherein n is a positive integer, yi is a compensation gray scale corresponding to xi;
partial differentiation of Q with respect to b0, b1, and b2 was found to solve the equations for b0, b1, and b2, respectively:
specifically, Q is the sum of the fitting function y (xi) corresponding to the 1 st to nth display gray scales xi and the square difference of the actually calculated compensation gray scale yi corresponding to xi
Let Q be 0, then
Wherein j is 0, 1 or 2.
Partial differentiation of Q with respect to b0, b1, and b2, respectively, yields:
solving formulas of b0, b1 and b2 can be calculated according to the formulas.
In the embodiment, the solving formula of each coefficient is determined by performing partial differential processing on the fitting function, the partial differential processing process is simple, the operation speed is high, and the solving speed of the fitting function is improved. In addition, when Q is equal to 0, the sum of the square differences of the fitting functions y (xi) corresponding to the 1 st to nth display gray scales xi and the actually calculated compensation gray scale yi corresponding to xi is zero, and at this time, the fitting functions y (xi) calculated according to Q are closest to yi, that is, the fitting functions are more in line with the actual corresponding relationship between the display gray scales and the compensation gray scales.
Optionally, determining the coefficient of the fitting function by using an iterative algorithm according to the solving formula and the set precision value of each coefficient, including:
using the set initial values of b0, b1 and b2 to obtain intermediate values of b0, b1 and b2 according to an iterative algorithm;
when the intermediate value and the set precision value satisfy the set relationship, the values of b0, b1, and b2 are determined according to the intermediate value.
In particular, the intermediate values may include b0, b1, and b2 values obtained in 2 or more successive iterations. Setting initial values of b0, b1 and b2 to be 0 or other values, for example, setting initial values of b0, b1 and b2 to be 1, iteratively substituting the setting initial values into a b0, b1 and b2 solution formula to obtain values of b0, b1 and b2, and determining values of b0, b1 and b2 obtained in the last iteration as coefficients of a fitting function when an absolute value or an s-th power of a difference between b0 values obtained in two adjacent iterations is smaller than the setting precision value, an absolute value or an s-th power of a difference between b1 values obtained in two adjacent iterations is smaller than the setting precision value, and an absolute value or an s-th power of a difference between b2 values obtained in two adjacent iterations is smaller than the setting precision value. Wherein s is an even number greater than or equal to 2.
Optionally, when the intermediate value and the set precision value satisfy the set relationship, determining the coefficient of the fitting function according to the intermediate value includes:
the intermediate value comprises b0 obtained in the current iteration1B0 obtained in the previous iteration2B1 obtained in the current iteration1B1 obtained in the previous iteration2B2 obtained in the current iteration1And b2 obtained from the previous iteration2；
Is provided with
And
b0 from the iteration when z0 < N, z1 < N and z2 < N1、b11And b21Determining the values of b0, b1, and b 2; wherein N is a set precision value.
Specifically, iteration is performed using the following formula:
sixthly, judging whether N is greater than z0 and N is greater than z1 and N is greater than z2, repeating the step of seventhly, and continuously judging whether N is greater than z0 and less than z1 and N is greater than z 2. When z0 < N and z1 < N and z2 < N are simultaneously satisfied, b01、b11And b12Meeting the precision requirement, and mixing b01、b11And b12Identified as b0, b1, and b2, respectively.
Further, the magnitude of the setting precision value N may be set as needed, the smaller N, the higher the precision of b0, b1, and b2, the more significant bits of b0, b1, and b2, but the longer the algorithm execution time. The size of N can be adjusted according to the storage coefficient precision of a memory in the display panel, such as a flash. For example, N ═ 1e-18 may be given. The scheme of this embodiment can shorten coefficient solution time, reduce the required precision to the memory in the display panel, reduce cost when guaranteeing that the coefficient value satisfies the required precision through adjusting the size of setting for precision value N.
In addition, the present embodiment only shows that the setting accuracy values of the coefficients of the fitting function are equal by way of example, and is not a limitation to the present invention.
Fig. 2 is a schematic diagram of a corresponding relationship curve of a display gray scale and a compensation gray scale provided in an embodiment of the present invention, fig. 2 is a corresponding relationship curve of a display gray scale and a compensation gray scale drawn by a fitting function solved by the method provided in this embodiment, referring to fig. 2, a compensation value in the graph is a compensation value obtained by actual calculation, as can be seen from fig. 2, the compensation value obtained by actual calculation is substantially located on the corresponding relationship curve, and the fitting degree of the fitting function solved in this embodiment to the actual compensation value is high.
Fig. 3 is a comparison graph of a corresponding relationship curve between a display gray scale and a compensation gray scale provided in the embodiment of the present invention, referring to fig. 3, a curve 1 is a curve corresponding to a fitting function between the display gray scale and the compensation gray scale obtained by using the method of the present embodiment, a curve 2 is a curve corresponding to a fitting function between the display gray scale and the compensation gray scale obtained by using a least square method, referring to fig. 3, a fitting function obtained by using the method of the present embodiment better conforms to an actual corresponding relationship between the display gray scale and the compensation gray scale in a low gray scale range.
Fig. 4 is a compensation visual effect diagram of a display panel obtained by compensating for a compensation gray scale obtained by using the fitting function of the present embodiment at the 16 gray scale, fig. 5 is a compensation visual effect diagram of a display panel obtained by compensating for a compensation gray scale obtained by using the fitting function obtained by the least square method at the 16 gray scale, fig. 6 is a difference value diagram between the compensation visual effect diagram shown in fig. 4 and the compensation visual effect diagram shown in fig. 5, and fig. 7 is a difference value diagram between the compensation visual effect diagram of the method of the present embodiment and the compensation visual effect diagram of the least square method at the 32 gray scale. The difference between the compensation visual effect graph shown in fig. 4 and the compensation visual effect graph shown in fig. 5 is greater than 0.5 gray scale, in the difference graph shown in fig. 7, the difference between the compensation visual effect graph obtained by compensating the display panel by using the compensation gray scale obtained by the fitting function of the present embodiment and the compensation visual effect graph obtained by compensating the compensation gray scale obtained by using the fitting function obtained by the least square method in 32 gray scales is greater than 0.5 gray scale, it can be known from fig. 3 to fig. 7 that the fitting function between the display gray scale and the compensation gray scale obtained by using the method of the present embodiment better conforms to the actual corresponding relationship between the display gray scale and the compensation gray scale, and the compensation effect of the compensation gray scale calculated according to the present embodiment is better in low gray scale.
Optionally, determining the compensation gray scales corresponding to a plurality of different display gray scales of the sub-pixels includes:
acquiring actual display brightness of a sub-pixel when the sub-pixel displays a plurality of different display gray scales;
and determining compensation gray scales corresponding to a plurality of different display gray scales according to the actual display brightness and the target brightness.
Specifically, the display panel may be controlled to sequentially display a plurality of different display gray scales, a luminance collecting device, such as a camera or an optical probe, is used to collect a plurality of display images of the display panel, and the actual display luminance of each sub-pixel when displaying the plurality of different display gray scales is determined according to the plurality of display images. When the actual display brightness has a deviation value with the target brightness, the corresponding sub-pixel needs brightness compensation, and the compensation gray scale can be obtained according to the target brightness and the gamma formula.
According to the gamma formula, the relationship between the compensation gray scale and the display gray scale can be determined as follows:
Nx＝N*(Lum_x/Ln)1/Gamma_ratiowhere Nx is the compensation gray level value, N is the display gray level value, Gamma _ ratio is the Gamma value, Lum _ x is the target brightness, and Ln is the actual display brightness.
Optionally, the target display brightness is an average brightness of a set region where the sub-pixel is located.
Specifically, the set area may be the entire display panel or a certain partition of the display panel, for example, the display panel may be divided into a plurality of small areas, and the actual display luminance of the sub-pixels in each small area may be averaged to obtain the average luminance, or the actual display luminance of all the sub-pixels in the entire display panel may be averaged to obtain the average luminance. The average brightness is taken as the target display brightness, so that the brightness adjustment value of each sub-pixel is small.
Fig. 8 is a structural diagram of a compensation apparatus for a display panel according to an embodiment of the present invention, and referring to fig. 8, a compensation apparatus 300 for a display panel includes:
a compensation gray level determining module 310, configured to determine compensation gray levels corresponding to a plurality of different display gray levels of the sub-pixels; the display panel comprises a plurality of sub-pixels;
a fitting function establishing module 320, configured to establish a fitting function between the display gray scale and the compensation gray scale according to the plurality of display gray scales and the compensation gray scale;
a solving formula determining module 330, configured to perform partial differential processing on the fitting function to determine a solving formula of each coefficient of the fitting function;
a coefficient determining module 340, configured to determine a coefficient of the fitting function by using an iterative algorithm according to the solution formula and the set precision value of each coefficient;
a fitting function storage module 350, configured to store the determined fitting function in the display panel, so that the display panel compensates each sub-pixel according to the fitting function.
Optionally, the fitting function of the display gray scale and the compensation gray scale is y (xi) ═ b0+b1xi+b2xi2(ii) a Wherein xi is the ith display gray scale, and b0, b1 and b2 are real numbers;
the solution formula determining module 330 is specifically configured to:
is provided with
Wherein n is a positive integer, yi is a compensation gray scale corresponding to xi;
partial differentiation of Q with respect to b0, b1, and b2 was found to solve the equations for b0, b1, and b2, respectively:
optionally, the coefficient determining module includes:
the intermediate value determining unit is used for calculating intermediate values of b0, b1 and b2 according to an iterative algorithm by adopting set initial values of b0, b1 and b 2;
and a coefficient determining unit for determining values of b0, b1 and b2 according to the intermediate value when the intermediate value and the setting precision value satisfy a setting relationship.
The compensation apparatus for a display panel provided in this embodiment and the compensation method for a display panel provided in any embodiment of the present invention belong to the same inventive concept, and have corresponding beneficial effects, and detailed technical details of the compensation apparatus for a display panel provided in any embodiment of the present invention are not described in detail in this embodiment.
Fig. 9 is a schematic diagram of a compensation system of a display panel according to an embodiment of the present invention, and referring to fig. 9, a compensation system 100 of a display panel includes a display panel 200 and a compensation apparatus 300 of a display panel according to any embodiment of the present invention.
Specifically, after the fitting function is determined by the compensation device 300 of the display panel, the fitting function of the display gray scale and the compensation gray scale is sent to the display panel 200, the display panel 200 stores the coefficient of the fitting function, when the display panel 200 displays a picture, the corresponding compensation gray scale is calculated according to the display gray scale and the fitting function of each sub-pixel, the compensation gray scale is adopted to compensate the sub-pixels, and the display uniformity of the display panel is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A compensation method for a display panel, comprising:
determining compensation gray scales corresponding to a plurality of different display gray scales of the sub-pixels; the display panel comprises a plurality of sub-pixels;
establishing a fitting function between the display gray scale and the compensation gray scale according to the plurality of display gray scales and the compensation gray scale;
carrying out partial differential processing on the fitting function to determine a solving formula of each coefficient of the fitting function;
determining the coefficient of the fitting function by adopting an iterative algorithm according to the solving formula and the set precision value of each coefficient;
storing the determined fitting function in a display panel, so that the display panel compensates each sub-pixel according to the fitting function.
2. The method of claim 1, wherein the fitting function of the display gray scale and the compensation gray scale is y (xi) b0+b1xi+b2xi2Wherein xi is the ith display gray scale b0, and b1 and b2 are real numbers;
the method for determining the solving formula of each coefficient of the fitting function by carrying out partial differential processing on the fitting function comprises the following steps:
is provided with
Wherein n is a positive integer, yi is a compensation gray scale corresponding to xi;
partial differentiation of Q with respect to b0, b1, and b2 was found to solve the equations for b0, b1, and b2, respectively:
3. the method of claim 2, wherein determining the coefficients of the fitting function using an iterative algorithm based on the solution formula and the set precision values for each coefficient comprises:
using the set initial values of b0, b1 and b2 to obtain intermediate values of b0, b1 and b2 according to an iterative algorithm;
when the intermediate value and the set precision value satisfy the set relationship, the values of b0, b1, and b2 are determined according to the intermediate value.
4. The method of claim 3, wherein determining coefficients of the fitting function from intermediate values when the intermediate values satisfy a set precision value comprises:
the intermediate value comprises b0 obtained in the current iteration1B0 obtained in the previous iteration2B1 obtained in the current iteration1B1 obtained in the previous iteration2B2 obtained in the current iteration1And b2 obtained from the previous iteration2；
Let z0 ═ (b 0)2-b01)2,z1＝(B12-B11)2And Z2＝(b22-b21)2；
B0 from the iteration when z0 < N, z1 < N and z2 < N1、b11And b21Determining the values of b0, b1, and b 2; wherein N is a set precision value.
5. The method of claim 1, wherein determining a compensation gray level corresponding to a plurality of different display gray levels for the sub-pixel comprises:
acquiring actual display brightness of a sub-pixel when the sub-pixel displays a plurality of different display gray scales;
and determining the compensation gray scales corresponding to the different display gray scales according to the actual display brightness and the target brightness.
6. The method of claim 5, wherein:
and the target display brightness is the average brightness of the set area where the sub-pixels are located.
7. A compensation apparatus for a display panel, comprising:
the compensation gray scale determining module is used for determining the compensation gray scales corresponding to a plurality of different display gray scales of the sub-pixels; the display panel comprises a plurality of sub-pixels;
the fitting function establishing module is used for establishing a fitting function between the display gray scale and the compensation gray scale according to the display gray scales and the compensation gray scales;
the solving formula determining module is used for carrying out partial differential processing on the fitting function to determine solving formulas of all coefficients of the fitting function;
the coefficient determining module is used for determining the coefficient of the fitting function according to the solving formula and the set precision value of each coefficient;
and the fitting function storage module is used for storing the determined fitting function in the display panel so that the display panel compensates each sub-pixel according to the fitting function.
8. The apparatus of claim 7, wherein the fitting function of the display gray scale and the compensation gray scale is y (xi) -b0+b1xi+b2xi2(ii) a Wherein xi is the ith display gray scale, and b0, b1 and b2 are real numbers;
the solution formula determination module is specifically configured to:
is provided with
Wherein n is a positive integer, yi is a compensation gray scale corresponding to xi;
partial differentiation of Q with respect to b0, b1, and b2 was found to solve the equations for b0, b1, and b2, respectively:
9. the apparatus of claim 8, wherein the coefficient determining module comprises:
the intermediate value determining unit is used for calculating intermediate values of b0, b1 and b2 according to an iterative algorithm by adopting set initial values of b0, b1 and b 2;
and a coefficient determining unit for determining values of b0, b1 and b2 according to the intermediate value when the intermediate value and the setting precision value satisfy a setting relationship.
10. A compensation system for a display panel, comprising a display panel and a compensation apparatus for a display panel according to any one of claims 7 to 9.
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