CN107248389B - Color gamut compensation method and device of display panel - Google Patents
Color gamut compensation method and device of display panel Download PDFInfo
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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Abstract
The embodiment of the invention discloses a color gamut compensation method and device of a display panel, and relates to the technical field of display. The method comprises the following steps: when the driving voltages of the red sub-pixel, the green sub-pixel and the blue sub-pixel are less than the target driving voltage, establishing a voltage compensation ratio value lookup table and a color gamut compensation lookup table according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b), and performing voltage compensation on the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the two lookup tables until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value, so that the problem that the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than the preset threshold value due to the existence of voltage drop is solved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a color gamut compensation method and device of a display panel.
Background
With the development and improvement of science and technology, various displays are widely used in daily life and work, and the requirements of people on the display effect of the display are higher and higher.
In the related art, the display device mostly uses a low temperature polysilicon thin film transistor to construct a pixel circuit to supply current to the display device. When the three primary colors of red, green and blue are mixed to emit light, a voltage drop is generated when a branch (for example, red) current flows through the conductive layer, that is, the driving voltage in actual operation is smaller than the theoretical driving voltage value, so the problem of voltage compensation needs to be considered. Due to the existence of the branch voltage drop, the result of some color gamut conversion deviates from the real color gamut, and the display effect is influenced.
Therefore, the problem of color gamut deviation caused by the existence of the voltage drop is urgently needed to be solved.
Disclosure of Invention
The embodiment of the invention provides a color gamut compensation method and device of a display panel, and aims to solve the problem that the difference value between the driving voltage of a red sub-pixel, a green sub-pixel and a blue sub-pixel and the target driving voltage is smaller than a preset threshold value due to the voltage drop of a branch.
In a first aspect, an embodiment of the present invention provides a color gamut compensation method for a display panel, including: when the driving voltage of a red sub-pixel, a green sub-pixel and a blue sub-pixel is smaller than a target driving voltage, acquiring the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b), wherein r is m different gray scales in the gray scales from 0 to 255, g is m different gray scales in the gray scales from 0 to 255, b is m different gray scales in the gray scales from 0 to 255, and m is an integer greater than or equal to 2 and less than or equal to 60;
establishing a voltage compensation proportion value lookup table of the red sub-pixel, the green sub-pixel and the blue sub-pixel under any gray scale combination according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b);
acquiring compensation brightness corresponding to the voltage compensation proportion value and gray scale coordinates to be compensated corresponding to the compensation brightness according to the voltage compensation proportion value in the voltage compensation proportion value lookup table;
obtaining a color gamut compensation lookup table of the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the gray scale coordinate to be compensated and an interpolation algorithm;
and performing voltage compensation on the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the color gamut compensation lookup table and the voltage compensation proportion value lookup table until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value.
In a second aspect, an embodiment of the present invention further provides a color gamut compensation apparatus for a display panel, including:
an obtaining module, configured to obtain luminance and chromaticity coordinates of the red, green, and blue subpixels at gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255), and (255,255, b) when driving voltages of the red, green, and blue subpixels are less than a target driving voltage, where r is m different gray scales among 0 to 255, g is m different gray scales among 0 to 255, b is m different gray scales among 0 to 255, and m is an integer greater than or equal to 2 and less than or equal to 60;
a first processing module, configured to establish a voltage compensation ratio value lookup table for the red sub-pixel, the green sub-pixel, and the blue sub-pixel under any gray scale combination according to luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel, and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255), and (255,255, b);
the second processing module is used for acquiring compensation brightness corresponding to the voltage compensation proportion value and gray scale coordinates to be compensated corresponding to the compensation brightness according to the voltage compensation proportion value in the voltage compensation proportion value lookup table;
the third processing module is used for obtaining a color gamut compensation lookup table of the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the gray scale coordinate to be compensated and an interpolation algorithm;
and the compensation module is used for performing voltage compensation on the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the color gamut compensation lookup table and the voltage compensation proportion value lookup table until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value.
In the color gamut compensation method of the display panel provided by the embodiment of the invention, when the driving voltages of the red sub-pixel, the green sub-pixel and the blue sub-pixel are smaller than the target driving voltage, the voltage compensation ratio value lookup table and the color gamut compensation lookup table are established according to the luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under the gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b), and the voltage compensation is performed on the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the two lookup tables until the difference value between the driving voltages of the red sub-pixel, the green sub-pixel and the blue sub-pixel and the target driving voltage is smaller than the preset threshold value, so that the problem of the red sub-pixel, the green sub-pixel and the blue sub-pixel caused by the existence of the branch voltage drop is, The difference value between the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value.
Drawings
Fig. 1 is a schematic flowchart of a color gamut compensation method of a display panel according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a color gamut compensation method of another display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a sampling space provided by an embodiment of the present invention;
FIG. 4 is a schematic representation of six tetrahedrons of equal volume provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a color gamut compensation apparatus of a display panel according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad invention. It should be further noted that, for convenience of description, only some structures, not all structures, relating to the embodiments of the present invention are shown in the drawings.
Fig. 1 is a flowchart illustrating a color gamut compensation method of a display panel according to this embodiment. Referring to fig. 1, the method includes the steps of:
In this embodiment, when the red sub-pixel, the green sub-pixel and the blue sub-pixel emit light in a mixed manner, a voltage drop may occur when a branch current of the sub-pixel flows through the conductive layer, that is, the driving voltage is smaller than the target driving voltage during actual operation, and the color gamut conversion result may be biased due to the existence of the voltage drop. When the driving voltages of the red sub-pixel, the green sub-pixel and the blue sub-pixel are less than the target driving voltage, taking m equal to 10 as an example, r is 10 different gray levels from 0 to 255. The luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under the gray scale (r,0,0) can be acquired in sequence by using an optical detection device; acquiring brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scale (0, g, 0); acquiring brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scale (0,0, b); acquiring brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scale (r, 255); acquiring brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (255, g and 255); luminance and chromaticity coordinates of the red, green, and blue sub-pixels at gray scales (255,255, b) are obtained.
And 120, establishing a voltage compensation proportion value lookup table of the red sub-pixel, the green sub-pixel and the blue sub-pixel under any gray scale combination according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b). Wherein, the voltage compensation proportion value may be:
the theoretical brightness value of the red sub-pixel, the green sub-pixel and/or the blue sub-pixel at the same gray scale is L', and the actual brightness value is L. Specifically, the luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel at gray scales (r,0,0), (0, g,0), (0,0, b) and (r,255,255) may be obtained according to the luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel at gray scales (r,255,255) of 10The voltage compensation proportion value of the red sub-pixel under any gray scale can be obtained according to the voltage compensation proportion value; according to the luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under the gray scales (r,0,0), (0, g,0), (0,0, b) and (255, g,255), voltage compensation proportion values of the red sub-pixel, the green sub-pixel and the blue sub-pixel under 10 gray scales (255, g,255) can be obtained, and voltage compensation proportion values of the green sub-pixel under any gray scale can be obtained according to the voltage compensation proportion values; according to the luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel at gray scales (r,0,0), (0, g,0), (0,0, b) and (255,255, b), voltage compensation proportion values of the red sub-pixel, the green sub-pixel and the blue sub-pixel at m gray scales (255,255, b) can be obtained, and according to the voltage compensation proportion values, voltage compensation proportion values of the blue sub-pixel at any gray scale can be obtained. In addition, a voltage compensation proportion value lookup table of the red, green and blue sub-pixels under any gray scale combination is established according to the voltage compensation proportion value of the red sub-pixel under any gray scale, the voltage compensation proportion value of the green sub-pixel under any gray scale and the voltage compensation proportion value of the blue sub-pixel under any gray scale.
And step 130, obtaining the compensation brightness corresponding to the voltage compensation proportion value and the gray scale coordinate to be compensated corresponding to the compensation brightness according to the voltage compensation proportion value in the voltage compensation proportion value lookup table. In this embodiment, the compensation luminance corresponding to the voltage compensation ratio value and the coordinates of the gray scale to be compensated corresponding to the compensation luminance may be obtained by using a formula (such as a colorimetry formula) according to the voltage compensation ratio value in the voltage compensation ratio value lookup table.
And step 140, obtaining a color gamut compensation lookup table of the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the gray scale coordinate to be compensated and an interpolation algorithm. In this embodiment, after obtaining the gray scale coordinates to be compensated, the gray scale compensation values of the gray scale coordinates to be compensated (e.g., (20,30,50)) can be obtained by using a difference algorithm (e.g., a tetrahedral interpolation algorithm), which are the gray scale compensation values of the red sub-pixel, the green sub-pixel, and the blue sub-pixel.
And 150, performing voltage compensation on the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the color gamut compensation lookup table and the voltage compensation ratio value lookup table until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value. Specifically, after the color gamut compensation lookup table and the voltage compensation ratio value lookup table are obtained, a gray scale compensation value corresponding to a coordinate of a gray scale to be compensated can be obtained according to the two lookup tables, and voltage compensation is performed on the red sub-pixel, the green sub-pixel and the blue sub-pixel by using the gray scale compensation value until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value.
In the color gamut compensation method of the display panel provided by this embodiment, when the driving voltages of the red sub-pixel, the green sub-pixel and the blue sub-pixel are less than the target driving voltage, establishing a voltage compensation ratio value lookup table and a color gamut compensation lookup table according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b), and performing voltage compensation on the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the two lookup tables until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value, so that the problem that the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than the preset threshold value due to the existence of voltage drop is solved.
Fig. 2 is a schematic flowchart of a color gamut compensation method of a display panel according to another embodiment of the present invention. On the basis of the above embodiment, optionally, the creating a voltage compensation ratio value lookup table of the red sub-pixel, the green sub-pixel and the blue sub-pixel under any gray scale combination according to the luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b) includes the following steps 121, 122, 123 and 124. Referring to fig. 2, the details are as follows:
In this embodiment, the voltage compensation ratio may be:
the theoretical brightness value of the red sub-pixel, the green sub-pixel and/or the blue sub-pixel under the same gray scale is L', and the actual brightness value is L. Specifically, the voltage compensation proportion Pvgb _ r of the red sub-pixel, the green sub-pixel and the blue sub-pixel under the gray scale (r,255,255) is in a linear relation with the corresponding gray scale value (r,255, 255); luminances Lrb _ g and Lrg _ b at gray levels (255, g _ in, 255) and (255, b _ in) are linearly related to corresponding gray levels (255, g _ in, 255) and (255, b _ in), respectively, wherein g _ in and b _ in may be arbitrary gray levels. From the above linear relationship, a voltage compensation ratio Pvgb _ r corresponding to the gray scale (r,255,255), a luminance Lrb _ g corresponding to the gray scale (255, g _ in, 255), and a luminance Lrg _ b corresponding to the gray scale (255, b _ in) can be obtained. The voltage compensation proportion value Pv _ r of the red sub-pixel under the gray level r is related to Pvgb _ r, Lrb _ g and Lrg _ b, and can be obtained according to Pvgb _ r, Lrb _ g and Lrg _ bAnd compensating the proportional value Pv _ r of the voltage of the red sub-pixel under the gray level r, thereby obtaining the proportional value of the voltage of the red sub-pixel under m gray levels r. And performing curve fitting on the voltage compensation proportional value Pv _ r of the red sub-pixel under the m gray scales r to obtain a fitted curve of the voltage compensation proportional value Pv _ r and the gray scale r, and acquiring the voltage compensation proportional value of the red sub-pixel under any gray scale according to the fitted curve.
In the present embodiment, the voltage compensation ratio Pvrb _ g of the red, green, and blue sub-pixels at the gray scale (255, g,255) is linear with the corresponding gray scale value (255, g, 255); the luminances Lgb _ r and Lrg _ b at the gray levels (r _ in, 255,255) and (255,255, b _ in) are linearly related to the corresponding gray levels (r _ in, 255,255) and (255,255, b _ in), respectively, wherein r _ in and b _ in may be arbitrary gray levels. From the above linear relationship, a voltage compensation ratio Pvrb _ g corresponding to the gray scale (255, g,255), a luminance Lgb _ r corresponding to the gray scale (r _ in, 255,255), and a luminance Lrg _ b corresponding to the gray scale (255, b _ in) can be obtained. The voltage compensation proportion value Pv _ g of the green sub-pixel under the gray scale g is related to Pvrb _ g, Lgb _ r and Lrg _ b, and the voltage compensation proportion value Pv _ g of the green sub-pixel under the gray scale g can be obtained according to Pvrb _ g, Lgb _ r and Lrg _ b, so that the voltage compensation proportion value of the green sub-pixel under m gray scales g can be obtained. And performing curve fitting on the voltage compensation proportional value Pv _ g of the green sub-pixel under m gray scales g to obtain a fitting curve of the voltage compensation proportional value Pv _ g and the gray scale g, and acquiring the voltage compensation proportional value of the green sub-pixel under any gray scale according to the fitting curve.
In the present embodiment, the voltage compensation ratio Pvrg _ b of the red, green and blue sub-pixels at the gray scale (255,255, b) is linear with the corresponding gray scale value (255,255, b); luminances Lgb _ r and Lrb _ g at gray levels (r _ in, 255,255) and (255, g _ in, 255) are linearly related to corresponding gray levels (r _ in, 255,255) and (255, g _ in, 255), respectively, wherein r _ in and g _ in may be arbitrary gray levels. From the above linear relationship, a voltage compensation ratio Pvrg _ b corresponding to the gray scale (255,255, b), a luminance Lgb _ r corresponding to the gray scale (r _ in, 255,255), and a luminance Lrb _ g corresponding to the gray scale (255, g _ in, 255) can be obtained. The voltage compensation proportion value Pv _ b of the blue sub-pixel under the gray scale b is related to Pvrg _ b, Lgb _ r and Lrb _ g, and the voltage compensation proportion value Pv _ b of the blue sub-pixel under the gray scale b can be obtained according to Pvrg _ b, Lgb _ r and Lrb _ g, so that the voltage compensation proportion value of the blue sub-pixel under m gray scales b can be obtained. And performing curve fitting on the voltage compensation proportion value Pv _ b of the blue sub-pixel under m gray scales b to obtain a fitting curve of the voltage compensation proportion value Pv _ b and the gray scale b, and acquiring the voltage compensation proportion value of the blue sub-pixel under any gray scale according to the fitting curve.
And step 124, establishing a voltage compensation ratio value lookup table of the red, green and blue sub-pixels under any gray scale combination according to the voltage compensation ratio value of the red sub-pixel under any gray scale, the voltage compensation ratio value of the green sub-pixel under any gray scale and the voltage compensation ratio value of the blue sub-pixel under any gray scale.
In this embodiment, after the fitting curve of Pv _ r and r, the fitting curve of Pv _ g and g, and the fitting curve of Pv _ b and b are obtained, that is, the voltage compensation ratio value of the red sub-pixel at any gray level, the voltage compensation ratio value of the green sub-pixel at any gray level, and the voltage compensation ratio value of the blue sub-pixel at any gray level are obtained. Therefore, the voltage compensation proportion value of the red, green and blue sub-pixels under any gray scale combination can be obtained, and the voltage compensation proportion value lookup table can be formed according to the corresponding relation between the gray scales of the red, green and blue sub-pixels and the voltage compensation proportion value.
In the color gamut compensation method of the display panel provided by this embodiment, when the driving voltages of the red sub-pixel, the green sub-pixel and the blue sub-pixel are less than the target driving voltage, establishing a voltage compensation ratio value lookup table and a color gamut compensation lookup table according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b), and performing voltage compensation on the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the two lookup tables until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value, so that the problem that the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than the preset threshold value due to the existence of voltage drop is solved.
Optionally, the obtaining, according to the voltage compensation ratio value in the voltage compensation ratio value lookup table, the compensation brightness corresponding to the voltage compensation ratio value and the to-be-compensated gray scale coordinate corresponding to the compensation brightness includes: acquiring compensation brightness corresponding to the voltage compensation proportion value according to the voltage compensation proportion value in the voltage compensation proportion value lookup table and a colorimetry formula; and acquiring gray scale coordinates to be compensated corresponding to the compensation brightness according to the compensation brightness.
In this embodiment, the colorimetry formula (1) is:
wherein, Rx and Ry are chromaticity coordinates of Red under sRGB (standard Red Green blue); gx and Gy are chromaticity coordinates of Green under sRGB (standard Red Green blue); bx and By are chromaticity coordinates of blue under sRGB (standard Red Green blue); LR255、LG255And LB255The brightness values of red, green and blue at 255 gray levels, Rx, Ry, Gx, Gy, Bx, By, LR255、LG255And LB255Both can be calculated, and in the case where the gray levels r, g, b are known, the tristimulus values X, Y and Z can be calculated using equation (1). The formula (2) is a formula for obtaining the gray scale coordinate to be compensated.
Wherein, R 'x and R' y are actually measured chromaticity coordinates of the red sub-pixel; g 'x and G' y are actually measured chromaticity coordinates of the green sub-pixel; b 'x and B' y are actually measured chromaticity coordinates of the blue sub-pixel; LR'255、LG’255And LB'255R 'x, R' y, G 'x, G' y, B 'x, B' y, LR 'are actually measured luminance values of the red, green and blue sub-pixels at a gray scale of 255'255、LG’255And LB'255Can be obtained by using an optical detection device;
the luminance to be compensated is respectively corresponding to the red sub-pixel, the green sub-pixel and the blue sub-pixel; r is', g ', and b ' are coordinates of the gray scale to be compensated; gamma rayR、γGAnd gammaBGamma values corresponding to red, green and blue sub-pixels, gamma value gammaR、γGAnd gammaBCan be obtained from the gamma curves (curves of brightness and gray scale) of the corresponding red sub-pixel, green sub-pixel and blue sub-pixel; pv _ r, Pv _ g, and Pv _ b are voltage compensation proportional values corresponding to the gray levels r, g, and b one to one. Under the condition that the gray scales r, g and b are known, the tristimulus values X, Y and Z can be obtained by the formula (1) according to the content, the Pv _ r, Pv _ g and Pv _ b respectively corresponding to the gray scales r, g and b can be obtained by the voltage compensation proportion value lookup table, and the coordinates r ', g ' and b ' of the gray scales to be compensated corresponding to the gray scales r, g and b can be obtained by the formula (2).
Optionally, the interpolation algorithm is a tetrahedral difference algorithm. In this embodiment, the color gamut compensation lookup table of the red sub-pixel, the green sub-pixel and the blue sub-pixel may be obtained according to the gray scale coordinate to be compensated and the tetrahedral interpolation algorithm.
Specifically, assuming that the gray scales of the red, green, and blue sub-pixels in the voltage compensation ratio lookup table are R, G and B, respectively, R, G and B are each set to 9 points at intervals of 32 in 0 to 255, that is, R, G and B are each set to 0, 31, 63, 95, 127, 159, 191, 223, and 255, and combining R, G and B can establish a uniform sampling space of 9 × 9 — 729 sampling points. And inserting the obtained compensation gray scale coordinates r ', g ' and b ' into the uniform sampling space as interpolation points. Fig. 3 is a schematic diagram of a sampling space provided by an embodiment of the present invention, fig. 4 is a schematic diagram of six tetrahedrons with equal volumes provided by an embodiment of the present invention, and referring to fig. 3 and fig. 4, it is assumed that the interpolation point is located in a cube HIJKLMNO surrounded by 8 points near the interpolation point (the HIJKLMNO is 8 sampling points out of 729 sampling points) in the sampling space; typically a cube may be divided into 6 tetrahedrons of equal volume, such as T1, T2, T3, T4, T5 and T6 in fig. 4, the interpolation point being located in one of the 6 tetrahedrons. The method for judging whether the interpolation point is contained in a certain tetrahedron is to calculate whether the sum of 4 new tetrahedron volumes formed by any 3 vertexes in the tetrahedron and the interpolation point is equal to the original tetrahedron volume, if so, the mapping values corresponding to the four vertexes of the original tetrahedron are selected for interpolation calculation. Assuming that the interpolation point P (r ', g', b ') is located in the tetrahedron HIMN, the tetrahedron HIMN is divided into four sub-tetrahedrons PMIN, PHMI, PHIN, and PHMN, and the compensation gray level P corresponding to the interpolation point P (r', g ', b') is:
P＝W0×P0+W1×P1+W2×P2+W3×P3formula (3)
Wherein, W0、W1、W2、W3Representing interpolation weights, which are the volume ratios of four sub-tetrahedrons PMIN, PHMI, PHIN, and PHMN to the total tetrahedron HIMN, respectively; p0、P1、P2、P3Is the gray scale value corresponding to point H, N, M, I. And (4) obtaining compensation gray scales P corresponding to the gray scales r, g and b by using a formula (3) and establishing a color gamut compensation lookup table. And performing voltage compensation on the red sub-pixel, the green sub-pixel and the blue sub-pixel by utilizing the gray scale P according to the color gamut compensation lookup table and the voltage compensation proportion value lookup table until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value.
Referring to fig. 3 and 4, the method of determining which tetrahedron the interpolation point P (r ', g ', b ') falls inside is as follows: if g'>b 'and b'>R', the interpolation point P being located at T1(HNKO); if b'>R 'and r'>G', the interpolation point P is located at T2(HNML); if b'>G 'and g'>r', the interpolation point P is at T3(HNLO); r'>G 'and g'>b', then the interpolation point P is located at T4(HNJI); if g'>b 'and r'>b', then the interpolation point P is located at T5(HNKJ); r'>b 'and b'>G', the interpolation point P is located at T6(HNMI).
The method for calculating the interpolation weight comprises the following steps: if the interpolation point falls within HNMI (T6), the tetrahedrons PHMI and HNMI have a common floor HMI and therefore a volume ratio equal to the vertex P and the vertexDistance ratio of point N to bottom HMI, VPHMI/VNHMI＝g’/32,VPHNI/VNHMI＝(b’-g’)/32，VPHNM/VNHMI(r '-b')/32. Interpolation weights for interpolation points P falling on other tetrahedra can be similarly found. Specifically, with reference to table 1, the determination condition of the interpolation point P in any one of the tetrahedrons T1-T6, and the corresponding weight W are given in table 10、W1、W2、W3And P0、P1、P2、P3And corresponding gray scale values, wherein PH, PI, PJ, PK, PL, PM, PN, and PO are gray scales corresponding to the vertex H, I, J, K, L, M, N, O, respectively.
TABLE 1
Alternatively, in the above embodiment, m is an integer of 15 or more and 30 or less. In this embodiment, when luminance and chromaticity coordinates of the red, green and blue sub-pixels at gray levels (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b) are obtained, where r is m different gray levels among 0 to 255, g is m different gray levels among 0 to 255, b is m different gray levels among 0 to 255, and if m is too large, the number of times of measurement and the amount of calculation increase, and if m is too small, the accuracy of subsequent calculation decreases, and preferably, in this embodiment, the value range of m is determined to be 15 or more and 30 or less.
Fig. 5 is a schematic structural diagram of a color gamut compensation apparatus of a display panel according to an embodiment of the present invention, and referring to fig. 5, the apparatus includes: an acquisition module 51, a first processing module 52, a second processing module 53, a third processing module 54 and a compensation module 55.
The obtaining module 51 is configured to obtain luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel, and the blue sub-pixel at gray levels (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255), and (255,255, b) when driving voltages of the red sub-pixel, the green sub-pixel, and the blue sub-pixel are less than a target driving voltage, where r is m different gray levels among 0 to 255, g is m different gray levels among 0 to 255, b is m different gray levels among 0 to 255, and m is an integer greater than or equal to 2 and less than or equal to 60.
A first processing module 52, configured to establish a voltage compensation ratio value lookup table of the red sub-pixel, the green sub-pixel, and the blue sub-pixel under any gray scale combination according to luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel, and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255), and (255,255, b);
and the second processing module 53 is configured to obtain, according to the voltage compensation ratio value in the voltage compensation ratio value lookup table, compensation brightness corresponding to the voltage compensation ratio value and a to-be-compensated gray scale coordinate corresponding to the compensation brightness.
And a third processing module 54, configured to obtain a color gamut compensation lookup table of the red sub-pixel, the green sub-pixel, and the blue sub-pixel according to the to-be-compensated gray scale coordinate and an interpolation algorithm.
And a compensation module 55, configured to perform voltage compensation on the red sub-pixel, the green sub-pixel, and the blue sub-pixel according to the color gamut compensation lookup table and the voltage compensation ratio value lookup table until a difference between the driving voltages of the red sub-pixel, the green sub-pixel, and the blue sub-pixel and the target driving voltage is smaller than a preset threshold.
The color gamut compensation device of the display panel provided by this embodiment, when the driving voltages of the red sub-pixel, the green sub-pixel and the blue sub-pixel are less than the target driving voltage, establishing a voltage compensation ratio value lookup table and a color gamut compensation lookup table according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b), and performing voltage compensation on the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the two lookup tables until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value, so that the problem that the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than the preset threshold value due to the existence of voltage drop is solved.
Optionally, the obtaining module 51 is specifically configured to: acquiring voltage compensation proportion values of the red sub-pixel, the green sub-pixel and the blue sub-pixel under m gray levels (r,255,255) according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under the gray levels (r,0,0), (0, g,0), (0,0, b) and (r,255, 255); acquiring a voltage compensation proportion value of the red sub-pixel at m gray scales r according to the voltage compensation proportion value, the brightness Lrb _ g of the green sub-pixel at the gray scale (255, g _ in, 255) and the brightness Lrg _ b of the blue sub-pixel at the gray scale (255,255, b _ in); performing curve fitting on the voltage compensation proportion values of the red sub-pixel under m gray scales r to obtain the voltage compensation proportion value of the red sub-pixel under any gray scale;
acquiring voltage compensation proportion values of the red sub-pixel, the green sub-pixel and the blue sub-pixel under m gray scales (255, g,255) according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under the gray scales (r,0,0), (0, g,0), (0,0, b) and (255, g, 255); acquiring voltage compensation proportion values of the green sub-pixel under m gray scales g according to the voltage compensation proportion value, the brightness Lgb _ r of the red sub-pixel under the gray scale (r _ in, 255,255) and the brightness Lrg _ b of the blue sub-pixel under the gray scale (255,255, b _ in); performing curve fitting on the voltage compensation proportion values of the green sub-pixels under m gray scales g to obtain the voltage compensation proportion values of the green sub-pixels under any gray scale;
acquiring voltage compensation proportional values of the red sub-pixel, the green sub-pixel and the blue sub-pixel under m gray scales (255,255, b) according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under the gray scales (r,0,0), (0, g,0), (0,0, b) and (255,255, b); acquiring voltage compensation proportion values of the blue sub-pixel under m gray scales b according to the voltage compensation proportion value, the brightness Lgb _ r of the red sub-pixel under the gray scale (r _ in, 255,255) and the brightness Lrg _ b of the green sub-pixel under the gray scale (255, g _ in, 255); performing curve fitting on the voltage compensation proportion values of the blue sub-pixels under m gray scales b to obtain the voltage compensation proportion values of the blue sub-pixels under any gray scale;
establishing a voltage compensation ratio value lookup table of the red, green and blue sub-pixels under any gray scale combination according to the voltage compensation ratio value of the red sub-pixel under any gray scale, the voltage compensation ratio value of the green sub-pixel under any gray scale and the voltage compensation ratio value of the blue sub-pixel under any gray scale; wherein, b _ in, g _ in and r _ in are any gray-scale values.
Optionally, the voltage compensation proportion value is:
wherein, the theoretical brightness value of the red sub-pixel, the green sub-pixel and/or the blue sub-pixel under the same gray scale is L', and the actual brightness value is L.
Optionally, the second processing module is specifically configured to: acquiring compensation brightness corresponding to the voltage compensation proportion value according to the voltage compensation proportion value in the voltage compensation proportion value lookup table and a colorimetry formula; and acquiring gray scale coordinates to be compensated corresponding to the compensation brightness according to the compensation brightness.
Optionally, the interpolation algorithm is a tetrahedral difference algorithm.
Optionally, m is an integer of 15 or more and 30 or less.
The color gamut compensation device of the display panel provided by the embodiment of the invention can be used for executing the color gamut compensation method of the display panel provided by the embodiment of the invention, and has corresponding functions and beneficial effects.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will appreciate that the embodiments of the present invention are not limited to the specific embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions will now occur to those skilled in the art without departing from the scope of the embodiments of the present invention. Therefore, although the embodiments of the present invention have been described in more detail through the above embodiments, the embodiments of the present invention are not limited to the above embodiments, and many other equivalent embodiments may be included without departing from the concept of the embodiments of the present invention, and the scope of the embodiments of the present invention is determined by the scope of the appended claims.
Claims (12)
1. A method of color gamut compensation for a display panel, comprising:
when the driving voltage of a red sub-pixel, a green sub-pixel and a blue sub-pixel is smaller than a target driving voltage, acquiring the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b), wherein r is m different gray scales in the gray scales from 0 to 255, g is m different gray scales in the gray scales from 0 to 255, b is m different gray scales in the gray scales from 0 to 255, and m is an integer greater than or equal to 2 and less than or equal to 60;
establishing a voltage compensation proportion value lookup table of the red sub-pixel, the green sub-pixel and the blue sub-pixel under any gray scale combination according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b);
acquiring compensation brightness corresponding to the voltage compensation proportion value and gray scale coordinates to be compensated corresponding to the compensation brightness according to the voltage compensation proportion value in the voltage compensation proportion value lookup table;
obtaining a color gamut compensation lookup table of the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the gray scale coordinate to be compensated and an interpolation algorithm;
and performing voltage compensation on the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the color gamut compensation lookup table and the voltage compensation proportion value lookup table until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value.
2. The compensation method according to claim 1, wherein the establishing a lookup table of voltage compensation ratio values of the red sub-pixel, the green sub-pixel and the blue sub-pixel at any gray scale combination according to luminance and chrominance coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel at gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255) and (255,255, b) comprises:
acquiring voltage compensation proportional values of the red sub-pixel, the green sub-pixel and the blue sub-pixel under m gray levels (r,255,255) according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under the gray levels (r,0,0), (0, g,0), (0,0, b) and (r,255,255), and recording the voltage compensation proportional values as first voltage compensation proportional values; acquiring voltage compensation proportion values of the red sub-pixel at m gray scales r according to the first voltage compensation proportion value, the brightness Lrb _ g of the green sub-pixel at a gray scale (255, g _ in, 255) and the brightness Lrg _ b of the blue sub-pixel at the gray scale (255,255, b _ in); performing curve fitting on the voltage compensation proportion values of the red sub-pixel under m gray scales r, obtaining the voltage compensation proportion value of the red sub-pixel under any gray scale, and recording the voltage compensation proportion value as a fourth voltage compensation proportion value;
acquiring voltage compensation proportional values of the red sub-pixel, the green sub-pixel and the blue sub-pixel under m gray scales (255, g,255) according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b) and (255, g,255), and recording the voltage compensation proportional values as second voltage compensation proportional values; acquiring voltage compensation proportion values of the green sub-pixel at m gray scales g according to the second voltage compensation proportion value, the brightness Lgb _ r of the red sub-pixel at a gray scale (r _ in, 255,255) and the brightness Lrg _ b of the blue sub-pixel at a gray scale (255,255, b _ in); performing curve fitting on the voltage compensation proportion values of the green sub-pixels under m gray scales g to obtain voltage compensation proportion values of the green sub-pixels under any gray scale, and recording the voltage compensation proportion values as fifth voltage compensation proportion values;
acquiring voltage compensation proportional values of the red sub-pixel, the green sub-pixel and the blue sub-pixel under m gray scales (255,255, b) according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b) and (255,255, b), and recording the voltage compensation proportional values as third voltage compensation proportional values; acquiring voltage compensation proportion values of the blue sub-pixel under m gray scales b according to the third voltage compensation proportion value, the brightness Lgb _ r of the red sub-pixel under the gray scale (r _ in, 255,255) and the brightness Lrg _ b of the green sub-pixel under the gray scale (255, g _ in, 255); performing curve fitting on the voltage compensation proportion values of the blue sub-pixel under m gray scales b to obtain a voltage compensation proportion value of the blue sub-pixel under any gray scale, and recording the voltage compensation proportion value as a sixth voltage compensation proportion value;
establishing a voltage compensation ratio value lookup table of the red, green and blue sub-pixels under any gray scale combination according to the voltage compensation ratio value of the red sub-pixel under any gray scale, the voltage compensation ratio value of the green sub-pixel under any gray scale and the voltage compensation ratio value of the blue sub-pixel under any gray scale;
wherein, b _ in, g _ in and r _ in are any gray-scale values.
3. The compensation method of claim 2, wherein the fourth voltage compensation scale value, the fifth voltage compensation scale value, and the sixth voltage compensation scale value are:
wherein, the theoretical brightness value of the red sub-pixel, the green sub-pixel and/or the blue sub-pixel under the same gray scale is L', and the actual brightness value is L.
4. The compensation method according to claim 1, wherein the obtaining of the compensation brightness corresponding to the voltage compensation ratio value and the gray scale coordinate to be compensated corresponding to the compensation brightness according to the voltage compensation ratio value in the voltage compensation ratio value lookup table comprises:
acquiring compensation brightness corresponding to the voltage compensation proportion value according to the voltage compensation proportion value in the voltage compensation proportion value lookup table and a colorimetry formula;
and acquiring gray scale coordinates to be compensated corresponding to the compensation brightness according to the compensation brightness.
5. The compensation method of claim 1, wherein the interpolation algorithm is a tetrahedral difference algorithm.
6. The compensation method as claimed in claim 1, wherein m is an integer of 15 or more and 30 or less.
7. A color gamut compensation apparatus for a display panel, comprising:
an obtaining module, configured to obtain luminance and chromaticity coordinates of the red, green, and blue subpixels at gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255), and (255,255, b) when driving voltages of the red, green, and blue subpixels are less than a target driving voltage, where r is m different gray scales among 0 to 255, g is m different gray scales among 0 to 255, b is m different gray scales among 0 to 255, and m is an integer greater than or equal to 2 and less than or equal to 60;
a first processing module, configured to establish a voltage compensation ratio value lookup table for the red sub-pixel, the green sub-pixel, and the blue sub-pixel under any gray scale combination according to luminance and chromaticity coordinates of the red sub-pixel, the green sub-pixel, and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b), (r,255,255), (255, g,255), and (255,255, b);
the second processing module is used for acquiring compensation brightness corresponding to the voltage compensation proportion value and gray scale coordinates to be compensated corresponding to the compensation brightness according to the voltage compensation proportion value in the voltage compensation proportion value lookup table;
the third processing module is used for obtaining a color gamut compensation lookup table of the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the gray scale coordinate to be compensated and an interpolation algorithm;
and the compensation module is used for performing voltage compensation on the red sub-pixel, the green sub-pixel and the blue sub-pixel according to the color gamut compensation lookup table and the voltage compensation proportion value lookup table until the difference value between the driving voltage of the red sub-pixel, the driving voltage of the green sub-pixel and the driving voltage of the blue sub-pixel and the target driving voltage is smaller than a preset threshold value.
8. The compensation device of claim 7, wherein the first processing module is specifically configured to:
acquiring voltage compensation proportional values of the red sub-pixel, the green sub-pixel and the blue sub-pixel under m gray levels (r,255,255) according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under the gray levels (r,0,0), (0, g,0), (0,0, b) and (r,255,255), and recording the voltage compensation proportional values as first voltage compensation proportional values; acquiring voltage compensation proportion values of the red sub-pixel at m gray scales r according to the first voltage compensation proportion value, the brightness Lrb _ g of the green sub-pixel at a gray scale (255, g _ in, 255) and the brightness Lrg _ b of the blue sub-pixel at the gray scale (255,255, b _ in); performing curve fitting on the voltage compensation proportion values of the red sub-pixel under m gray scales r, obtaining the voltage compensation proportion value of the red sub-pixel under any gray scale, and recording the voltage compensation proportion value as a fourth voltage compensation proportion value;
acquiring voltage compensation proportional values of the red sub-pixel, the green sub-pixel and the blue sub-pixel under m gray scales (255, g,255) according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b) and (255, g,255), and recording the voltage compensation proportional values as second voltage compensation proportional values; acquiring voltage compensation proportion values of the green sub-pixel at m gray scales g according to the second voltage compensation proportion value, the brightness Lgb _ r of the red sub-pixel at a gray scale (r _ in, 255,255) and the brightness Lrg _ b of the blue sub-pixel at a gray scale (255,255, b _ in); performing curve fitting on the voltage compensation proportion values of the green sub-pixels under m gray scales g to obtain voltage compensation proportion values of the green sub-pixels under any gray scale, and recording the voltage compensation proportion values as fifth voltage compensation proportion values;
acquiring voltage compensation proportional values of the red sub-pixel, the green sub-pixel and the blue sub-pixel under m gray scales (255,255, b) according to the brightness and chromaticity coordinates of the red sub-pixel, the green sub-pixel and the blue sub-pixel under gray scales (r,0,0), (0, g,0), (0,0, b) and (255,255, b), and recording the voltage compensation proportional values as third voltage compensation proportional values; acquiring voltage compensation proportion values of the blue sub-pixel under m gray scales b according to the third voltage compensation proportion value, the brightness Lgb _ r of the red sub-pixel under the gray scale (r _ in, 255,255) and the brightness Lrg _ b of the green sub-pixel under the gray scale (255, g _ in, 255); performing curve fitting on the voltage compensation proportion values of the blue sub-pixel under m gray scales b to obtain a voltage compensation proportion value of the blue sub-pixel under any gray scale, and recording the voltage compensation proportion value as a sixth voltage compensation proportion value;
establishing a voltage compensation ratio value lookup table of the red, green and blue sub-pixels under any gray scale combination according to the voltage compensation ratio value of the red sub-pixel under any gray scale, the voltage compensation ratio value of the green sub-pixel under any gray scale and the voltage compensation ratio value of the blue sub-pixel under any gray scale;
wherein, b _ in, g _ in and r _ in are any gray-scale values.
9. The compensation arrangement of claim 8, wherein the fourth, fifth and sixth voltage compensation scale values are:
wherein, the theoretical brightness value of the red sub-pixel, the green sub-pixel and/or the blue sub-pixel under the same gray scale is L', and the actual brightness value is L.
10. The compensation device of claim 7, wherein the second processing module is specifically configured to:
acquiring compensation brightness corresponding to the voltage compensation proportion value according to the voltage compensation proportion value in the voltage compensation proportion value lookup table and a colorimetry formula;
and acquiring gray scale coordinates to be compensated corresponding to the compensation brightness according to the compensation brightness.
11. The compensation arrangement of claim 7, wherein the interpolation algorithm is a tetrahedral difference algorithm.
12. The compensating apparatus as claimed in claim 7, wherein m is an integer of 15 or more and 30 or less.
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