CN109712569B - Method for reducing display chromatic aberration and OLED display panel - Google Patents

Method for reducing display chromatic aberration and OLED display panel Download PDF

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CN109712569B
CN109712569B CN201711009700.7A CN201711009700A CN109712569B CN 109712569 B CN109712569 B CN 109712569B CN 201711009700 A CN201711009700 A CN 201711009700A CN 109712569 B CN109712569 B CN 109712569B
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display panel
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CN109712569A (en
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任娟
马绍栋
郑欢
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EverDisplay Optronics Shanghai Co Ltd
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Abstract

The embodiment of the invention discloses a method for reducing display chromatic aberration and an OLED display panel, which comprises the following steps: calculating a first current when the display panel displays a picture to be displayed, calculating a second current when the display panel is in white balance under a first gray scale value according to the first gray scale value of the first sub-pixel aiming at the first sub-pixel, and calculating a grid voltage compensation quantity of the first sub-pixel according to a resistance value of a peripheral circuit of the display panel, the first current and the second current so as to compensate the grid voltage of the first sub-pixel when the picture to be displayed is displayed. Therefore, for any sub-pixel in the display panel, the sum of the currents of all the sub-pixels when the display panel is in white balance under the gray scale can be obtained according to the gray scale of the sub-pixel in the picture to be displayed, and further the grid voltage compensation quantity of the sub-pixel is obtained, so that the grid voltage of the sub-pixel is compensated when the picture to be displayed is displayed, and the problem that the display of the OLED display panel has color difference is solved.

Description

Method for reducing display chromatic aberration and OLED display panel
Technical Field
The invention relates to the technical field of displays, in particular to a method for reducing display chromatic aberration and an OLED display panel.
Background
In an Active Matrix Organic Light-Emitting Diode (AMOLED) panel, a Thin Film Transistor (TFT) of each sub-pixel is a current-driven display. Due to the limitation of the design of the panel TFT circuit, the sources of the TFTs of all the sub-pixels in the panel are connected to a common anode voltage, and because a certain resistance exists in the metal wiring of the TFT circuit in the panel, the actual source voltages of the sub-pixels in the panel are different from each other although the grid voltages provided by the driving ICs are the same, so that the actual display brightness of each sub-pixel in the panel is different from the brightness of the sub-pixel in a white balance state, the sub-pixel cannot show the display effect under the Gamma2.2 curve, and the problem of color difference exists in the panel display.
In summary, there is a need for a method for reducing display color difference, so as to solve the technical problem that the display of the AMOLED panel in the prior art has color difference and cannot show the actual display effect.
Disclosure of Invention
The invention provides a method for reducing display chromatic aberration and an OLED display panel, which are used for solving the technical problem that the display of an AMOLED panel in the prior art has chromatic aberration and cannot show the actual display effect.
The method for reducing the display color difference provided by the embodiment of the invention comprises the following steps:
calculating a first current of the display panel when the display panel displays a picture to be displayed, wherein the first current is the sum of currents of all sub-pixels on the display panel when the picture to be displayed is displayed;
aiming at a first sub-pixel, calculating a second current of the display panel under the first gray scale value when the display panel is in white balance according to a first gray scale value corresponding to the first sub-pixel in the picture to be displayed, and calculating a grid voltage compensation quantity of the first sub-pixel according to a resistance value of a peripheral circuit of the display panel, the first current and the second current; the first sub-pixel is any one sub-pixel on the display panel, and the second current is the sum of currents when all the sub-pixels on the display panel display the first gray-scale value;
and when the picture to be displayed is displayed, compensating the grid voltage of the first sub-pixel according to the grid voltage compensation quantity of the first sub-pixel.
Optionally, calculating a first current of the display panel when displaying a picture to be displayed includes:
counting the number of sub-pixels with each gray-scale value in the sub-pixels of the color in the picture to be displayed aiming at the sub-pixels of any color; for each gray-scale value in the gray-scale values, obtaining a first sub-current of the sub-pixel of the color when the display panel displays the picture to be displayed according to the number of the sub-pixels of the color at the gray-scale value and the current of the sub-pixels of all the colors at the white balance of the gray-scale value;
and obtaining the first current according to the sum of the first sub-currents of the sub-pixels of each color.
Optionally, obtaining the first current according to a sum of the first sub-currents of the sub-pixels of the respective colors includes:
Figure GDA0002721440450000021
wherein, I1M and n are resolutions of the display panel,
Figure GDA0002721440450000022
a first sub-current S of a red sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of red sub-pixels with the gray scale value of k in all the red sub-pixels, IRkThe sum of the currents of all the red sub-pixels when the display panel is in white balance with a gray-scale value of k;
Figure GDA0002721440450000023
a first sub-current, P, of the green sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of green sub-pixels with the gray scale value of k in all the green sub-pixels, IGkThe sum of the currents of all green sub-pixels when the display panel is in white balance with a gray-scale value of k;
Figure GDA0002721440450000024
a first sub-current, Q, of the blue sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of blue sub-pixels with the gray scale value of k in all the blue sub-pixels of the display panel, IBkIs the sum of the currents of all the blue sub-pixels when the display panel is in white balance with a gray scale value of k.
Optionally, calculating a second current of the display panel at white balance under a first gray scale value according to the first gray scale value corresponding to the first sub-pixel in the to-be-displayed picture, including:
aiming at the sub-pixel of any color, according to the corresponding relation L of the brightness and the current of the sub-pixel of the colorXGray＝a×IXGray+b，Calculating a second sub-current of the sub-pixel of the color when the display panel is in white balance at the first gray scale value by the following formula:
Figure GDA0002721440450000031
wherein, IXGrayWhen the display panel is in white balance under the first Gray scale value, the second sub-current is the sum of the currents of all the sub-pixels with the color when the display panel is in white balance, X represents the color of the sub-pixel, Gray is the first Gray scale value, IX255The sum of the currents of the sub-pixels of all the colors when the display panel is in white balance under 255 gray scales is obtained, and a and b are linear coefficients in the corresponding relation between the brightness of the sub-pixels of the colors and the currents;
and obtaining the second current according to the sum of the second sub-currents of the sub-pixels of the colors.
Optionally, the resistance value of the peripheral circuit of the display panel is calculated as follows:
individually lighting sub-pixels with set colors in the display panel by using set gray-scale values to obtain expected gate voltage values and actual gate voltage values of the sub-pixels with the set colors;
calculating a third sub-current of sub-pixels of two colors other than the set color in the display panel when the display panel is in the white balance under the set gray scale value; the third sub-current of the sub-pixel of any one of the other two colors is the sum of the currents of the sub-pixels of all the colors when the display panel displays the white balance under the set gray scale value;
and calculating the resistance value of the peripheral circuit of the display panel according to the expected gate voltage value, the actual gate voltage value and the three sub-currents of the sub-pixels of the other two colors.
Optionally, calculating a gate voltage compensation amount of the first sub-pixel according to a resistance value of a peripheral circuit of the display panel, the first current and the second current by using a formula including:
ΔVdata＝(I2-I1)×r
wherein, is Δ VdataIs the gate voltage compensation amount of the first sub-pixel, I2Is the second current, I1R is a resistance value of a peripheral circuit of the display panel for the first current.
Based on the same inventive concept, the invention provides an OLED display panel, comprising:
the processing module is used for calculating a first current of the display panel when the display panel displays a picture to be displayed, wherein the first current is the sum of currents of all sub-pixels on the display panel when the picture to be displayed is displayed;
for a first sub-pixel, calculating a second current of the display panel in white balance under a first gray scale value according to a first gray scale value corresponding to the first sub-pixel in the picture to be displayed, and calculating a gate voltage compensation quantity of the first sub-pixel according to a resistance value of a peripheral circuit of the display panel, the first current and the second current; the first sub-pixel is any one sub-pixel on the display panel, and the second current is the sum of currents when all the sub-pixels on the display panel display the first gray-scale value;
and the compensation module is used for compensating the grid voltage of the first sub-pixel according to the grid voltage compensation quantity of the first sub-pixel when the picture to be displayed is displayed.
Optionally, the processing module is specifically configured to:
counting the number of sub-pixels with each gray-scale value in the sub-pixels of the color in the picture to be displayed aiming at the sub-pixels of any color; for each gray-scale value in the gray-scale values, obtaining a first sub-current of the sub-pixel of the color when the display panel displays the picture to be displayed according to the number of the sub-pixels of the color at the gray-scale value and the current of the sub-pixels of all the colors at the white balance of the gray-scale value;
and obtaining the first current according to the sum of the first sub-currents of the sub-pixels of each color.
Optionally, the processing module is specifically further configured to calculate the first current according to the following formula:
Figure GDA0002721440450000041
wherein, I1M and n are resolutions of the display panel,
Figure GDA0002721440450000042
a first sub-current S of a red sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of red sub-pixels with the gray scale value of k in all the red sub-pixels, IRkThe sum of the currents of all the red sub-pixels when the display panel is in white balance with a gray-scale value of k;
Figure GDA0002721440450000051
a first sub-current, P, of the green sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of green sub-pixels with the gray scale value of k in all the green sub-pixels, IGkThe sum of the currents of all green sub-pixels when the display panel is in white balance with a gray-scale value of k;
Figure GDA0002721440450000052
a first sub-current, Q, of the blue sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of blue sub-pixels with the gray scale value of k in all the blue sub-pixels of the display panel, IBkIs the sum of the currents of all the blue sub-pixels when the display panel is in white balance with a gray scale value of k.
Optionally, the processing module is further specifically configured to:
aiming at the sub-pixel of any color, according to the corresponding relation L of the brightness and the current of the sub-pixel of the colorXGray＝a×IXGray+ b, calculating a second sub-current of the sub-pixel of the color when the display panel is in white balance at the first gray scale value by the following formula:
Figure GDA0002721440450000053
wherein, IXGrayIs the second sub-current, which is the sum of the currents of all the sub-pixels of the color when the display panel is in white balance at the first gray scale value, LXGrayIs the brightness of the sub-pixel of the color at a first Gray level, X represents the color of the sub-pixel, Gray is the first Gray level, IX255The sum of the currents of the sub-pixels of all the colors when the display panel is in white balance under 255 gray scales is obtained, and a and b are linear coefficients in the corresponding relation between the brightness of the sub-pixels of the colors and the currents;
and obtaining the second current according to the sum of the second sub-currents of the sub-pixels of the colors.
Optionally, the processing module is further configured to:
individually lighting sub-pixels with set colors in the display panel by using set gray-scale values to obtain expected gate voltage values and actual gate voltage values of the sub-pixels with the set colors;
calculating a third sub-current of sub-pixels of two colors other than the set color in the display panel when the display panel is in the white balance under the set gray scale value; the third sub-current of the sub-pixel of any one of the other two colors is the sum of the currents of the sub-pixels of all the colors when the display panel displays the white balance under the set gray scale value;
and calculating the resistance value of the peripheral circuit of the display panel according to the expected gate voltage value, the actual gate voltage value and the second sub-currents of the sub-pixels of the other two colors.
Optionally, the processing module is specifically configured to:
ΔVdata＝(I2-I1)×r
wherein, is Δ VdataIs the gate voltage compensation amount of the first sub-pixel, I2Is the second current, I1R is a resistance value of a peripheral circuit of the display panel for the first current.
Another embodiment of the present invention provides an OLED display panel, which includes a memory and a processor, wherein the memory is used for storing program instructions, and the processor is used for calling the program instructions stored in the memory, and executing any one of the above methods according to the obtained program.
Another embodiment of the present invention provides a computer storage medium having stored thereon computer-executable instructions for causing a computer to perform any one of the methods described above.
In the embodiment of the invention, a first current of the display panel when displaying a to-be-displayed picture is calculated, a second current of the display panel when the display panel is in white balance under a first gray scale value is calculated according to a first gray scale value corresponding to the first sub-pixel in the to-be-displayed picture aiming at the first sub-pixel, a grid voltage compensation quantity of the first sub-pixel is calculated according to a resistance value of a peripheral circuit of the display panel, the first current and the second current, and then the grid voltage of the first sub-pixel is compensated according to the grid voltage compensation quantity of the first sub-pixel when displaying the to-be-displayed picture. It can be seen that, for any sub-pixel in the display panel, according to the first gray scale value of the sub-pixel in the to-be-displayed picture, the sum of the currents of all the sub-pixels of the display panel in the white balance under the first gray scale value can be obtained, and then the gate voltage compensation amount of the sub-pixel is calculated, so as to compensate the gate voltage of the sub-pixel when the to-be-displayed picture is displayed, and correct the current of the sub-pixel to the current of the sub-pixel when the display panel is in the white balance under the first gray scale value, thereby solving the problems that the display of the OLED display panel has chromatic aberration and the actual display effect cannot be displayed.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart illustrating a method for reducing display color difference according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for calculating a resistance of a peripheral circuit of an OLED display panel according to an embodiment of the present invention;
fig. 3 is a circuit structure diagram of an OLED display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an OLED display panel according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto.
Fig. 1 shows a schematic flow chart corresponding to a method for reducing display color difference provided in an embodiment of the present invention, and as shown in fig. 1, the method includes:
step S101: calculating a first current of the display panel when the display panel displays a picture to be displayed, wherein the first current is the sum of currents of all sub-pixels on the display panel when the picture to be displayed is displayed;
step S102: aiming at a first sub-pixel, calculating a second current of the display panel under the first gray scale value when the display panel is in white balance according to a first gray scale value corresponding to the first sub-pixel in the picture to be displayed, and calculating a grid voltage compensation quantity of the first sub-pixel according to a resistance value of a peripheral circuit of the display panel, the first current and the second current; the first sub-pixel is any one sub-pixel on the display panel, and the second current is the sum of currents when all the sub-pixels on the display panel display the first gray-scale value;
step S103: and when the picture to be displayed is displayed, compensating the grid voltage of the first sub-pixel according to the grid voltage compensation quantity of the first sub-pixel.
It can be seen that, for any sub-pixel in the display panel, according to the first gray scale value of the sub-pixel in the to-be-displayed picture, the sum of the currents of all the sub-pixels of the display panel in the white balance under the first gray scale value can be obtained, and then the gate voltage compensation amount of the sub-pixel is calculated, so as to compensate the gate voltage of the sub-pixel when the to-be-displayed picture is displayed, and correct the current of the sub-pixel to the current of the sub-pixel when the display panel is in the white balance under the first gray scale value, thereby solving the problems that the display of the OLED panel has chromatic aberration and the actual display effect cannot be displayed.
Specifically, the to-be-displayed frame in step S101 is any frame to be displayed by the display panel, and after the display panel acquires the to-be-displayed frame, the first current may be calculated by executing step S101. The first current is the sum of currents of all sub-pixels on the display panel when the to-be-displayed picture is displayed. If the resolution of the display panel is m × n, the first current is
Figure GDA0002721440450000081
Here, Ii,jIndicating the current for the pixel in row i and column j.
In the embodiment of the invention, a plurality of pixels are arranged in an array manner in the display panel, wherein any one pixel comprises sub-pixels with three colors of red, green and blue. Therefore, after the picture to be displayed is obtained, the first current can be obtained by counting the display gray scale of each sub-pixel in the display panel. The specific calculation process is as follows:
and counting the number of the sub-pixels in each gray scale in the sub-pixels of the color in the picture to be displayed aiming at any color, and obtaining the first sub-current of the sub-pixels of the color when the display panel displays the picture to be displayed according to the number of the sub-pixels in each gray scale value in the sub-pixels of the color and the sum of the currents of the sub-pixels of all the colors in the display panel under the white balance of each gray scale value.
Taking the red sub-pixel as an example, the first sub-current I of the red sub-pixelRedSatisfy the requirement of
Figure GDA0002721440450000082
Where k represents a gray scale, m × n is a resolution of the display panel, SkThe display panel is used for displaying the image to be displayed, the number of red sub-pixels with the gray scale of k in all the red sub-pixels of the display panel is shown, the red sub-pixels can be obtained by counting the display gray scale of the image to be displayed, IRkThe sum of the currents of all the red sub-pixels when the display panel is in white balance with the gray scale k can be calculated by white frame color matching.
Similarly, the first sub-current I of the green sub-pixelGreenSatisfies the following conditions:
Figure GDA0002721440450000091
wherein, PkThe number of the green sub-pixels with the gray scale of k in all the green sub-pixels of the display panel is shown when the display panel displays the picture to be displayed, and the number can be obtained by counting the display gray scale of the picture to be displayed, IGkIndicating that all green sub-pixels of the display panel are in white balance with a gray level of kThe sum of the currents can be calculated by white-frame color matching.
First sub-current I of blue sub-pixelBlueSatisfies the following conditions:
Figure GDA0002721440450000092
wherein Q iskThe number of blue sub-pixels with the gray scale of k in all the blue sub-pixels of the display panel is shown when the display panel displays the picture to be displayed, and the number can be obtained by counting the display gray scale of the picture to be displayed, IBkThe sum of the currents of all the blue sub-pixels when the display panel is in white balance with the gray scale of k can be obtained through white picture color matching calculation.
In this way, after the first sub-currents of the sub-pixels of each color when the display panel displays the to-be-displayed picture are calculated, the first sub-currents of the sub-pixels of each color are added, and the sum obtained is the first current. I.e. the first current I1Equal to:
Figure GDA0002721440450000093
in the embodiment of the invention, because the display panel is specifically an OLED display panel, the luminance and the current of each sub-pixel approximately satisfy the following linear relationship:
LXGray＝a×IXGray+ b formula five
Wherein, X represents the color of the sub-pixel, and takes one of red (R), green (G) and blue (B), and LXGrayIndicating the brightness of the X color sub-pixel when the Gray level is Gray, IXGrayWhen the display panel is in white balance with Gray scale Gray, the sum of the currents of all the sub-pixels of the X color is shown, a and b are coefficients in the linear relation, and the specific values of a and b are different for the sub-pixels of different colors.
In addition, the luminance of the sub-pixels of the OLED display panel also satisfies the gamma2.2 curve:
Figure GDA0002721440450000101
wherein L is255The brightness of a sub-pixel at a gray level of 255, LGrayThe Gray level of the sub-pixel is the brightness of Gray.
The fifth formula and the sixth formula are solved simultaneously to obtain the current sum I of all the sub-pixels of the X color when the display panel is in white balance with Gray scaleXGray：
Figure GDA0002721440450000102
Wherein, IX255Which represents the sum of the currents of all the sub-pixels of the X color when the display panel is in white balance with a gray scale of 255 (i.e., when displaying a pure white picture).
As shown in the seventh formula, I in the fourth formulaRk、IGkAnd IBkRespectively satisfy:
Figure GDA0002721440450000103
wherein, IR255、IG255、IB255Respectively, the current sum of all red sub-pixels, all green sub-pixels and all blue sub-pixels when the display panel is in white balance with the gray scale of 255 (namely when a pure white picture is displayed), which can be obtained by calculating the color matching of the white picture, a1、b1Coefficient corresponding to the red sub-pixel, a2、b2Coefficient corresponding to the green sub-pixel, a3、b3The coefficient corresponding to the blue sub-pixel can be obtained by testing the display panel.
In step S102, for a first sub-pixel in the display panel (the first sub-pixel is any sub-pixel in the display panel), a first gray-scale value corresponding to the first sub-pixel in the to-be-displayed image can be obtained according to the to-be-displayed image, and then for any sub-pixel in the display panelCalculating the second sub-current I of each color sub-pixel when the display panel is in white balance under the first gray scale value by the formula sevenXGray。
Specifically, when the formula seven is applied to calculate the second sub-currents of the sub-pixels of each color, X represents the color of the sub-pixel and is one of red, green and blue, and Gray represents the first Gray scale value.
Further, the second sub-currents of the sub-pixels of the colors are added to obtain a second current I when the display panel is in white balance under the first gray scale value2：
I2＝IRGray+IGGray+IBGrayFormula nine
Furthermore, the first current I is set according to the resistance r of the peripheral circuit of the display panel1And a second current I2Calculating the gate voltage compensation amount of the first sub-pixel by the following formula:
Figure GDA0002721440450000111
in the embodiment of the present invention, the resistance value of the peripheral circuit of the display panel may be calculated as follows, as shown in fig. 2, and specifically includes the following steps S201 to S203:
step S201: individually lighting the sub-pixels with set colors in the display panel by the set gray scale values to obtain the expected gate voltage value and the actual gate voltage value of the sub-pixels with the set colors;
step S202: and calculating the third sub-current of the sub-pixels of the other two colors except the set color in the display panel when the display panel is in the white balance under the set gray-scale value.
Step S203: and calculating the resistance value of the peripheral circuit of the display panel according to the expected value of the grid voltage, the actual grid voltage value and the second sub-currents of the sub-pixels of the other two colors.
Specifically, in step S201, the sub-pixel of the set color may be a sub-pixel of any one of three colors of red, green, and blue. The set gray scale value can be set by those skilled in the art according to the actual situation, and can be set to 255 gray scales in general.
Taking the sub-pixel with the set color as the red sub-pixel and the sub-pixel with the set gray scale value as 255 as an example, the setting of the gray scale value to individually light the sub-pixels with the set color in the display panel means that (255, 0, 0) lights each sub-pixel in the display panel, that is, the gray scales of all the red sub-pixels in the display panel are 255, the gray scales of all the green and blue sub-pixels are 0, and the display panel presents a pure red picture.
In step S202, the third sub-current of the sub-pixel of any one of the two colors other than the set color is the sum of the currents of the sub-pixels of all the colors when the display panel displays the white balance at the set gray scale value. That is, the third sub-current of the green sub-pixel is the sum of the currents of all the green sub-pixels when the display panel displays the white balance at the set gray scale value, and the third sub-current of the blue sub-pixel is the sum of the currents of all the blue sub-pixels when the display panel displays the white balance at the set gray scale value.
In step S203, the resistance value r of the peripheral circuit of the display panel is calculated to satisfy the following formula:
Figure GDA0002721440450000121
wherein, V'dataThe expected value of the gate voltage of the sub-pixel for setting the color can be obtained by theoretical calculation, VdataThe actual gate voltage value of the sub-pixel for a set color can be calculated by reading the actual Data value of the driving IC, if X is the set color, Y and Z represent two colors other than the set color, IYGrayAnd IZGrayRespectively indicate the preset gray level values on the display panelIn the white balance, the currents of the sub-pixels of the other two colors are summed.
For example, setting the color red and the gray scale value 255, the resistance r of the peripheral circuit of the display panel satisfies:
Figure GDA0002721440450000122
wherein, IG255And IB255The sum of the currents of all the green sub-pixels and the blue sub-pixels is respectively when the display panel is in white balance under 255 gray scales (i.e. when all the green sub-pixels and the blue sub-pixels in the display panel are lighted up under 255 gray scales for pure white pictures).
Thus, through the steps S101 and S102, the gate voltage compensation amount of all the sub-pixels in the display panel can be calculated, and further, in step S103, the gate voltage of each sub-pixel can be compensated according to the gate voltage compensation amount of each sub-pixel when the to-be-displayed picture is displayed.
It should be noted that, in the embodiment of the present invention, before the to-be-displayed picture is displayed, gate voltage compensation amounts of all sub-pixels in the display panel may be calculated, and then when the to-be-displayed picture is displayed, the sub-pixels are compensated one by one according to a refresh sequence of the to-be-displayed picture; and when the to-be-displayed picture is displayed, calculating and compensating the gate voltage compensation amount of each sub-pixel one by one according to the refreshing sequence of the to-be-displayed picture, which is not specifically limited in the present invention.
Fig. 3 is a circuit structure diagram of an OLED display panel provided in an embodiment of the present invention, and the following describes in detail the principle of calculating the gate voltage compensation amount of the sub-pixel in the embodiment of the present invention with reference to fig. 3:
as shown in fig. 3, a plurality of pixels are arranged in an array in the OLED display panel, and the resolution of the display panel is m × n, that is, there are m rows and n columns in the pixel array of the display panel. Each pixel in the pixel array comprises 3 sub-pixels, and the colors are red, green and blue respectively. Specifically, each sub-pixel is specifically an OLED (organic light emitting diode) device, and each OLED device is driven and displayed by a corresponding TFT (thin film transistor) current, that is, the gray-scale brightness of each sub-pixel is determined by the current passing through the sub-pixel.
In fig. 3, the sources of the TFTs corresponding to all the sub-pixels in the pixel array are connected to a common anode voltage ELVDD, and the cathodes of all the sub-pixels are connected to a common cathode voltage ELVSS. In addition, all the sub-pixels in each column in the pixel array correspond to a source (data) line, and the gates of all the sub-pixels in the column are connected to the source line. As an example, only the source line to which the rightmost sub-pixel in one pixel is connected is shown in fig. 3, but it should be noted that the gate of the TFT of each sub-pixel in the pixel array is connected to its corresponding source line.
Taking the sub-pixel of X color in the ith row and the jth column in the pixel array as an example, the current flowing through the sub-pixel is
IXi,j＝C(Vgs-Vth)2Formula twelve
Wherein, IXi,jThe current of the X color sub-pixel in the ith row and the jth column, C is a coefficient, VthIs the turn-on voltage, V, of the TFT corresponding to the sub-pixelgsConsidering the peripheral resistance r of the display panel outside the pixel array, the gate-source voltage difference of the TFT corresponding to the sub-pixel can be further specifically expressed as:
Figure GDA0002721440450000131
wherein, VdataI.e. the gate voltage of the sub-pixel.
As can be seen from formulas twelve and thirteen, the current flowing through the sub-pixel is specifically:
Figure GDA0002721440450000132
as can be seen, for the pixel where the sub-pixel is located (i.e. the pixel located in the ith row and the jth column in the pixel array), since the sub-pixel has three colors, namely red, green and blue, included in the pixel, the current of the pixel can be expressed as:
Ii,j＝IRi,j+IGi,j+IBi,jequation fifteen
Wherein, Ii,jIs the current of the pixel, IRi,j、IGi,j、IBi,jThe currents of the red, green and blue sub-pixels in the pixel are respectively.
Furthermore, when the display panel displays a pure white screen (i.e., when the gray levels of the red, green, and blue subpixels in the display panel are all 255), the current of any subpixel in the display panel is equal to:
IX255≈C(Vdata-Vth-ELVDD+(IR255+IG255+IB255)×r)2formula sixteen
Wherein, IX255Representing the current of any sub-pixel, X being the colour of the sub-pixel, IR255Represents the sum of currents, I, of all red sub-pixels in the display panel at the gray level of 255G255Represents the sum of currents, I, of all green sub-pixels in the display panel at the gray level of 255B255Which represents the sum of the currents at the gray level 255 for all the blue subpixels in the display panel.
Similarly, when the display panel displays a white balance picture with Gray scale (i.e. Gray scale of red, green and blue sub-pixels in the display panel is Gray), the current of any sub-pixel is equal to:
IXi,j≈C(Vdata-Vth-ELVDD+(IRGray+IGGray+IBGray)×r)2seventeen formula
Wherein, IRGrayRepresents the sum of currents, I, of all red sub-pixels in the display panel at Gray level GrayG255Represents the sum of currents, I, of all green sub-pixels in the display panel at Gray level GrayB255Represents the sum of the currents of all the blue sub-pixels in the display panel at the Gray level Gray.
However, when the display panel is actually operated, the displayed picture is usually a complex picture, and in this case, the current of any sub-pixel is equal to:
Figure GDA0002721440450000141
due to the influence of the peripheral resistance voltage division, when the display panel displays a white balance picture with Gray scale, the total current I of all the sub-pixels in the display panelRGray+IGGray+IBGrayAnd the sum of the currents of all the sub-pixels in the display panel when displaying a complex picture
Figure GDA0002721440450000151
Different, therefore, the voltage difference V between the gate and the source of each sub-pixel in the display panel is the voltage difference V when the white balance picture with Gray scale is displayedgsAnd a gate-source voltage difference V 'when displaying a complex picture'gsTherefore, the current of each sub-pixel in the display panel when displaying a complex picture is different from the current of the sub-pixel when displaying a white balance picture, and the display panel has display color difference.
In order to eliminate display color difference, i.e., to correct the display effect of each sub-pixel in the complex picture to the display effect in white balance, the current I 'of each sub-pixel in the complex picture is required'Xi,jCurrent I in white balanceXi,jEquality, therefore, the gate voltage V of each sub-pixel in a complex picture needs to be changeddataSo that the compensated gate-source voltage difference V ″' of each sub-pixelgsDifference of gate-source voltage V in white balancegsEqual, i.e. Vgs＝Vgs。
For example, in any sub-pixel, the gate voltage of the sub-pixel is assumed to be V 'after the gate voltage is compensated'dataThen the current of any sub-pixel after compensation is equal to:
Figure GDA0002721440450000152
is formed byXi,j＝IXi,jIt can be obtained that the gate voltage compensation value of any sub-pixel is equal to Δ Vdata：
Figure GDA0002721440450000153
As can be seen from the equation twenty, in steps S201 to S203, when the sub-pixels of the display panel with the set color are individually turned on by the set gray-scale value, the resistance r of the peripheral circuit of the display panel can be calculated if the actual gate voltage value and the expected gate voltage value are known.
The following describes a process of a method for reducing display color difference, especially a process of calculating a gate voltage compensation value of a sub-pixel, according to an embodiment of the present invention.
For a display panel, before adjusting the gate voltage of each sub-pixel by the method in the embodiment of the present invention, basic data of the display panel is first obtained, as shown in table 1 below:
Figure GDA0002721440450000154
Figure GDA0002721440450000161
TABLE 1
Where CIE-x and CIE-y represent color coordinates, W, R, G, B represent white, red, green, and blue pictures, respectively, and L255Indicating the panel brightness of the sub-pixel at 255 gray levels.
Taking a pure color picture (180,204,68) as an example, the display color difference and the brightness difference of the picture before the gate voltage compensation are shown in the following table 2:
Item before compensation (180,204,68) Theory of the invention Color/brightness difference
CIE-x 0.3854 0.3865 1.51JNCD
CIE-y 0.5352 0.5198
L(nits) 218 177.03 23.20％
Vdata-R 4.3154
Vdata-G 4.1763
Vdata-B 4.5656
TABLE 2
According to the data in table 1, when the red sub-pixel in the display panel is lit up individually at 255 gray levels (i.e., the display panel displays (255, 0, 0)), the resistance of the peripheral circuit of the display panel is calculated as:
Figure GDA0002721440450000162
further, the gate voltage compensation amounts of the red, green, and blue sub-pixels in the pure color picture (180,204,68) are calculated according to the formula twenty.
Taking a red sub-pixel as an example, if the gray scale of the red sub-pixel under the pure color frame is 180, the current of the red sub-pixel is corrected to be the current when the display panel is under the white balance frame (180, 180, 180) with the gray scale of 180, and thus, the gate voltage compensation amount of the red sub-pixel is:
Figure GDA0002721440450000171
wherein the content of the first and second substances,
Figure GDA0002721440450000172
the sum of the currents of all the sub-pixels under the pure white picture can be obtained by counting the number of the red, green and blue sub-pixels under each gray scale under the pure white picture and then calculating according to a formula IV. Because the picture is a pure color picture, the gray scale of all red sub-pixels in the display panel is 180, and the gray scale of all green sub-pixelsThe gray levels are all 204, and the gray levels of all the blue sub-pixels are all 68, so in equation four,
Figure GDA0002721440450000173
each item is 1, and the content of the compound is 1,
Figure GDA0002721440450000174
Figure GDA0002721440450000175
further, it is found that:
ΔVdata-R＝(IG180+IB180-IG204-IB68) xr-0.03766V equation twenty-three
Similarly, the gate voltage compensation of the green sub-pixel can be obtained as follows:
ΔVdata-G＝(IR204+IB204-IR180-IB68) Xr is 0.06603V formula twenty-four
The gate voltage compensation amount of the blue sub-pixel is as follows:
ΔVdata-B＝(IR60+IG60-IR180-IG204) xr-0.04133V equation twenty-five
Further, the gate voltage of each sub-pixel in the display panel is compensated, that is, the original gate voltage is added to the calculated gate voltage compensation value to obtain the compensated gate voltage. In this example, the gate voltages of the red, green and blue sub-pixels are 4.3531V, 4.2423V and 4.5246V, respectively. Subsequently, the gate voltage compensation value is converted into a display gray scale of each sub-pixel, and the data as shown in table 3 can be obtained as follows:
Item compensationRear (172,188,75) Theory of the invention Color/brightness difference
CIE-x 0.3864 0.3865 0.58JNCD
CIE-y 0.5137 0.5198
L(nits) 182.7 177.03 3.20％
Vdata-R 4.3531
Vdata-G 4.2423
Vdata-B 4.5246
TABLE 3
As can be seen from table 3, the luminance difference after compensation is reduced from 23.2% to 3.2%, the display color difference is reduced from 1.51JNCD to 0.58JNCD, and the display color difference problem of the display panel is obviously improved.
Based on the same inventive concept, an OLED display panel is further provided in the embodiments of the present invention, fig. 4 is a schematic structural diagram of the OLED display panel provided in the embodiments of the present invention, and as shown in fig. 4, the OLED display panel 400 includes:
the processing module 401 is configured to calculate a first current of the display panel when displaying a to-be-displayed picture, where the first current is a sum of currents of all sub-pixels on the display panel when displaying the to-be-displayed picture;
for a first sub-pixel, calculating a second current of the display panel in white balance under a first gray scale value according to a first gray scale value corresponding to the first sub-pixel in the picture to be displayed, and calculating a gate voltage compensation quantity of the first sub-pixel according to a resistance value of a peripheral circuit of the display panel, the first current and the second current; the first sub-pixel is any one sub-pixel on the display panel, and the second current is the sum of currents when all the sub-pixels on the display panel display the first gray-scale value;
and a compensation module 402, configured to compensate the gate voltage of the first sub-pixel according to the gate voltage compensation amount of the first sub-pixel when the to-be-displayed picture is displayed.
Optionally, the processing module 401 is specifically configured to:
counting the number of sub-pixels with each gray-scale value in the sub-pixels of the color in the picture to be displayed aiming at the sub-pixels of any color; for each gray-scale value in the gray-scale values, obtaining a first sub-current of the sub-pixel of the color when the display panel displays the picture to be displayed according to the number of the sub-pixels of the color at the gray-scale value and the current of the sub-pixels of all the colors at the white balance of the gray-scale value;
and obtaining the first current according to the sum of the first sub-currents of the sub-pixels of each color.
Optionally, the processing module 401 is specifically further configured to calculate the first current according to the following formula:
Figure GDA0002721440450000181
wherein, I1M and n are resolutions of the display panel,
Figure GDA0002721440450000182
a first sub-current S of a red sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of red sub-pixels with the gray scale value of k in all the red sub-pixels, IRkThe sum of the currents of all the red sub-pixels when the display panel is in white balance with a gray-scale value of k;
Figure GDA0002721440450000191
a first sub-current, P, of the green sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of green sub-pixels with the gray scale value of k in all the green sub-pixels, IGkThe sum of the currents of all green sub-pixels when the display panel is in white balance with a gray-scale value of k;
Figure GDA0002721440450000192
a first sub-current, Q, of the blue sub-pixel when the display panel displays the picture to be displayedkThe number of blue sub-pixels with the gray scale value of k in all the blue sub-pixels of the display panel when the display panel displays the picture to be displayed,IBkis the sum of the currents of all the blue sub-pixels when the display panel is in white balance with a gray scale value of k.
Optionally, the processing module 401 is further specifically configured to:
aiming at the sub-pixel of any color, according to the corresponding relation L of the brightness and the current of the sub-pixel of the colorXGray＝a×IXGray+ b, calculating a second sub-current of the sub-pixel of the color when the display panel is in white balance at the first gray scale value by the following formula:
Figure GDA0002721440450000193
wherein, IXGrayIs the second sub-current, which is the sum of the currents of all the sub-pixels of the color when the display panel is in white balance at the first gray scale value, LXGrayIs the brightness of the sub-pixel of the color at a first Gray level, X represents the color of the sub-pixel, Gray is the first Gray level, IX255The sum of the currents of the sub-pixels of all the colors when the display panel is in white balance under 255 gray scales is obtained, and a and b are linear coefficients in the corresponding relation between the brightness of the sub-pixels of the colors and the currents;
and obtaining the second current according to the sum of the second sub-currents of the sub-pixels of the colors.
Optionally, the processing module 401 is further configured to:
individually lighting sub-pixels with set colors in the display panel by using set gray-scale values to obtain expected gate voltage values and actual gate voltage values of the sub-pixels with the set colors;
calculating a third sub-current of sub-pixels of two colors other than the set color in the display panel when the display panel is in the white balance under the set gray scale value; the third sub-current of the sub-pixel of any one of the other two colors is the sum of the currents of the sub-pixels of all the colors when the display panel displays the white balance under the set gray scale value;
and calculating the resistance value of the peripheral circuit of the display panel according to the expected gate voltage value, the actual gate voltage value and the second sub-currents of the sub-pixels of the other two colors.
Optionally, the processing module 401 is specifically configured to:
ΔVdata＝(I2-I1) X r formula twenty eight
Wherein, is Δ VdataIs the gate voltage compensation amount of the first sub-pixel, I2Is the second current, I1R is a resistance value of a peripheral circuit of the display panel for the first current.
Based on the same inventive concept, the present invention provides another OLED Display panel, where the OLED Display panel may include a Central Processing Unit (CPU), a memory, an input/output device, and the like, the input device may include a keyboard, a mouse, a touch screen, and the like, and the output device may include a Display device, such as a Liquid Crystal Display (LCD), a Cathode Ray Tube (CRT), and the like.
The memory may include Read Only Memory (ROM) and Random Access Memory (RAM), and provides the processor with program instructions and data stored in the memory. In an embodiment of the present invention, the memory may be used to store a program of the above method for reducing display color difference.
The processor is used for executing the method for reducing the display color difference according to the obtained program instructions by calling the program instructions stored in the memory.
Based on the same inventive concept, embodiments of the present invention provide a computer storage medium for storing computer program instructions for the above-mentioned computing device, which includes a program for executing the above-mentioned method for reducing display color difference.
The computer storage media may be any available media or data storage device that can be accessed by a computer, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.
From the above, it can be seen that:
in the embodiment of the invention, a first current of the display panel when displaying a to-be-displayed picture is calculated, a second current of the display panel when the display panel is in white balance under a first gray scale value is calculated according to a first gray scale value corresponding to the first sub-pixel in the to-be-displayed picture aiming at the first sub-pixel, a grid voltage compensation quantity of the first sub-pixel is calculated according to a resistance value of a peripheral circuit of the display panel, the first current and the second current, and then the grid voltage of the first sub-pixel is compensated according to the grid voltage compensation quantity of the first sub-pixel when displaying the to-be-displayed picture. It can be seen that, for any sub-pixel in the display panel, according to the first gray scale value of the sub-pixel in the to-be-displayed picture, the sum of the currents of all the sub-pixels of the display panel in the white balance under the first gray scale value can be obtained, and then the gate voltage compensation amount of the sub-pixel is calculated, so as to compensate the gate voltage of the sub-pixel when the to-be-displayed picture is displayed, and correct the current of the sub-pixel to the current of the sub-pixel when the display panel is in the white balance under the first gray scale value, thereby solving the problems that the display of the OLED display panel has chromatic aberration and the actual display effect cannot be displayed.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. A method for reducing display color difference, which is applied to an OLED display panel, and comprises the following steps:
calculating a first current of the display panel when the display panel displays a picture to be displayed, wherein the first current is the sum of currents of all sub-pixels on the display panel when the picture to be displayed is displayed;
aiming at a first sub-pixel, calculating a second current of the display panel under the first gray scale value when the display panel is in white balance according to a first gray scale value corresponding to the first sub-pixel in the picture to be displayed, and calculating the second current according to a resistance value r of a peripheral circuit of the display panel and the first current I1And the second current I2Calculating a gate voltage compensation amount of the first sub-pixel by the following formula:
ΔVdata＝(I2-I1)×r
the first sub-pixel is any one sub-pixel on the display panel, and the second current is the sum of currents when all the sub-pixels on the display panel display the first gray-scale value;
and when the picture to be displayed is displayed, compensating the grid voltage of the first sub-pixel according to the grid voltage compensation quantity of the first sub-pixel.
2. The method of claim 1, wherein calculating the first current of the display panel when displaying the picture to be displayed comprises:
counting the number of sub-pixels with each gray-scale value in the sub-pixels of the color in the picture to be displayed aiming at the sub-pixels of any color; for each gray-scale value in the gray-scale values, obtaining a first sub-current of the sub-pixel of the color when the display panel displays the picture to be displayed according to the number of the sub-pixels of the color at the gray-scale value and the current of the sub-pixels of all the colors at the white balance of the gray-scale value;
and obtaining the first current according to the sum of the first sub-currents of the sub-pixels of each color.
3. The method of claim 2, wherein obtaining the first current according to a sum of the first sub-currents of sub-pixels of respective colors comprises:
Figure FDA0002721440440000011
wherein, I1M and n are resolutions of the display panel,
Figure FDA0002721440440000021
a first sub-current S of a red sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of red sub-pixels with the gray scale value of k in all the red sub-pixels, IRkThe sum of the currents of all the red sub-pixels when the display panel is in white balance with a gray-scale value of k;
Figure FDA0002721440440000022
a first sub-current, P, of the green sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of green sub-pixels with the gray scale value of k in all the green sub-pixels, IGkThe sum of the currents of all green sub-pixels when the display panel is in white balance with a gray-scale value of k;
Figure FDA0002721440440000023
a first sub-current, Q, of the blue sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of blue sub-pixels with the gray scale value of k in all the blue sub-pixels of the display panel, IBkFor the display panel in white with a gray scale value of kAt equilibrium, the sum of the currents of all the blue subpixels.
4. The method according to claim 1, wherein calculating the second current of the display panel in white balance at the first gray scale value according to the first gray scale value corresponding to the first sub-pixel in the frame to be displayed comprises:
aiming at the sub-pixel of any color, according to the corresponding relation L of the brightness and the current of the sub-pixel of the colorXGray＝a×IXGray+ b, calculating a second sub-current of the sub-pixel of the color when the display panel is in white balance at the first gray scale value by the following formula:
Figure FDA0002721440440000024
wherein, IXGrayWhen the display panel is in white balance under the first Gray scale value, the second sub-current is the sum of the currents of all the sub-pixels with the color when the display panel is in white balance, X represents the color of the sub-pixel, Gray is the first Gray scale value, IX255The sum of the currents of the sub-pixels of all the colors when the display panel is in white balance under 255 gray scales is obtained, and a and b are linear coefficients in the corresponding relation between the brightness of the sub-pixels of the colors and the currents;
and obtaining the second current according to the sum of the second sub-currents of the sub-pixels of the colors.
5. The method according to claim 1, wherein the resistance value of the peripheral circuit of the display panel is calculated by:
individually lighting sub-pixels with set colors in the display panel by using set gray-scale values to obtain expected gate voltage values and actual gate voltage values of the sub-pixels with the set colors;
calculating a third sub-current of sub-pixels of two colors other than the set color in the display panel when the display panel is in the white balance under the set gray scale value; the third sub-current of the sub-pixel of any one of the other two colors is the sum of the currents of the sub-pixels of all the colors when the display panel displays the white balance under the set gray scale value;
and calculating the resistance value of the peripheral circuit of the display panel according to the expected gate voltage value, the actual gate voltage value and the three sub-currents of the sub-pixels of the other two colors.
6. An OLED display panel, comprising:
the processing module is used for calculating a first current of the display panel when the display panel displays a picture to be displayed, wherein the first current is the sum of currents of all sub-pixels on the display panel when the picture to be displayed is displayed;
and aiming at the first sub-pixel, calculating a second current of the display panel under the first gray scale value when the display panel is in white balance according to the first gray scale value corresponding to the first sub-pixel in the picture to be displayed, and calculating the second current according to the resistance value r of the peripheral circuit of the display panel and the first current I1And the second current I2Calculating a gate voltage compensation amount of the first sub-pixel by the following formula:
ΔVdata＝(I2-I1)×r
the first sub-pixel is any one sub-pixel on the display panel, and the second current is the sum of currents when all the sub-pixels on the display panel display the first gray-scale value;
and the compensation module is used for compensating the grid voltage of the first sub-pixel according to the grid voltage compensation quantity of the first sub-pixel when the picture to be displayed is displayed.
7. The OLED display panel of claim 6, wherein the processing module is specifically configured to:
counting the number of sub-pixels with each gray-scale value in the sub-pixels of the color in the picture to be displayed aiming at the sub-pixels of any color; for each gray-scale value in the gray-scale values, obtaining a first sub-current of the sub-pixel of the color when the display panel displays the picture to be displayed according to the number of the sub-pixels of the color at the gray-scale value and the current of the sub-pixels of all the colors at the white balance of the gray-scale value;
and obtaining the first current according to the sum of the first sub-currents of the sub-pixels of each color.
8. The OLED display panel of claim 7, wherein the processing module is further configured to calculate the first current according to the following formula:
Figure FDA0002721440440000041
wherein, I1M and n are resolutions of the display panel,
Figure FDA0002721440440000042
a first sub-current S of a red sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of red sub-pixels with the gray scale value of k in all the red sub-pixels, IRkThe sum of the currents of all the red sub-pixels when the display panel is in white balance with a gray-scale value of k;
Figure FDA0002721440440000043
a first sub-current, P, of the green sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of green sub-pixels with the gray scale value of k in all the green sub-pixels, IGkFor the current of all green sub-pixels when the display panel is in white balance with a gray scale value of kSumming;
Figure FDA0002721440440000044
a first sub-current, Q, of the blue sub-pixel when the display panel displays the picture to be displayedkWhen the display panel displays the picture to be displayed, the number of blue sub-pixels with the gray scale value of k in all the blue sub-pixels of the display panel, IBkIs the sum of the currents of all the blue sub-pixels when the display panel is in white balance with a gray scale value of k.
9. The OLED display panel of claim 6, wherein the processing module is further configured to:
aiming at the sub-pixel of any color, according to the corresponding relation L of the brightness and the current of the sub-pixel of the colorXGray＝a×IXGray+ b, calculating a second sub-current of the sub-pixel of the color when the display panel is in white balance at the first gray scale value by the following formula:
Figure FDA0002721440440000045
wherein, IXGrayIs the second sub-current, which is the sum of the currents of all the sub-pixels of the color when the display panel is in white balance at the first gray scale value, LXGrayIs the brightness of the sub-pixel of the color at a first Gray level, X represents the color of the sub-pixel, Gray is the first Gray level, IX255The sum of the currents of the sub-pixels of all the colors when the display panel is in white balance under 255 gray scales is obtained, and a and b are linear coefficients in the corresponding relation between the brightness of the sub-pixels of the colors and the currents;
and obtaining the second current according to the sum of the second sub-currents of the sub-pixels of the colors.
10. The OLED display panel of claim 6, wherein the processing module is further configured to:
individually lighting sub-pixels with set colors in the display panel by using set gray-scale values to obtain expected gate voltage values and actual gate voltage values of the sub-pixels with the set colors;
calculating a third sub-current of sub-pixels of two colors other than the set color in the display panel when the display panel is in the white balance under the set gray scale value; the third sub-current of the sub-pixel of any one of the other two colors is the sum of the currents of the sub-pixels of all the colors when the display panel displays the white balance under the set gray scale value;
and calculating the resistance value of the peripheral circuit of the display panel according to the expected gate voltage value, the actual gate voltage value and the second sub-currents of the sub-pixels of the other two colors.
11. An OLED display panel, comprising:
a memory for storing program instructions;
a processor for calling program instructions stored in said memory to execute the method of any one of claims 1 to 5 in accordance with the obtained program.
12. A computer storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of any one of claims 1 to 5.
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