CN110444176B - Pixel color difference compensation method and system of display panel and display device - Google Patents
Pixel color difference compensation method and system of display panel and display device Download PDFInfo
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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Abstract
The invention discloses a pixel color difference compensation method and system of a display panel and a display device, belonging to the technical field of display. The pixel chromatic aberration compensation system is used for realizing the pixel chromatic aberration compensation method of the display panel. The display device comprises the pixel chromatic aberration compensation system of the display panel, and the pixel chromatic aberration compensation system can effectively solve the phenomenon of uneven brightness of the display panel and improve the yield of the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel chromatic aberration compensation method and system of a display panel and a display device.
Background
With the development of the optical and semiconductor technology, the development of Flat Panel Display (Flat Panel Display) is also increased, and various types of Display panels, such as Liquid Crystal Display (LCD) panels, Plasma Display Panels (PDP), Organic Light-Emitting Diode (OLED) Display panels, and the like, are commonly included in various devices such as smart phones, notebook computers, televisions, and tablet personal computers. Such displays are typically flat, ultra-thin display devices consisting of a large number of individually driven color pixels placed in front of a light source or reflector to produce an image. Among many flat panel displays, liquid crystal displays have been used in various aspects of production and life due to their superior characteristics such as high space utilization efficiency, low power consumption, no radiation, and low electromagnetic interference. When the liquid crystal display panel is produced in a batch, the brightness of the liquid crystal display panel is not uniform due to some process defects, and various Mura (Mura refers to the phenomenon that the brightness of the display device is not uniform, and various marks are caused) are formed inevitably. In order to solve the problem, at present, on a production line of the liquid crystal display panel, Mura repair is performed on each display panel, so that the brightness of the liquid crystal display panel is consistent.
Since the lcd panel does not emit light, the backlight module is one of the key components of the lcd device because the backlight module needs to provide a light source to normally display images. The backlight module is divided into a side-in type backlight module and a direct type backlight module according to different incident positions of the light source. In the prior art, an array type LED surface light source is adopted, as shown in fig. 1 and 2, fig. 1 is a schematic diagram of a light transmission principle of a direct type backlight module in the prior art, fig. 2 is a schematic diagram of a light emission spectrum excited by a fluorescent film 01 between the brightness of a gap B between LED point light sources 00 and the brightness of a vertical position a between the LED point light sources 00 in fig. 1, and a starry Mura of the surface light source means that when the array type LED point light sources 00 emit light, the brightness of the gap B between the LED point light sources 00 and the brightness of the vertical position a between the LED point light sources 00 are different due to the difference of light flux values of all light emission angles, and after the array type LED point light sources 00 emit light, the light emission spectra of the two positions are not consistent, so that the brightness and the chromaticity.
In the prior art, a way to reduce the Mura of the area light source is as follows: the brightness difference brought by the point light source of the backlight module is compensated by adjusting the brightness of the whole surface pixel. However, in practical applications, when gray scale brightness of corresponding pixel points is adjusted to compensate, the frequency spectrums of the gaps between the LED point light sources of the backlight module and the vertical positions of the LED point light sources are still different, so that the visual brightness still has difference, and the starry Mura of the surface light source still cannot be completely eliminated.
Therefore, it is an urgent need to provide a method, a system, and a display device for compensating pixel color difference of a display panel, which can effectively solve the uneven brightness of the display panel and improve the yield of the display panel.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for compensating pixel chromatic aberration of a display panel, and a display device, so as to solve the problem that the yield of the display panel is affected due to the high occurrence rate of the uneven brightness of the display panel in the prior art.
The invention provides a pixel chromatic aberration compensation method of a display panel, wherein each pixel at least comprises a plurality of sub-pixels with different colors; the compensation method comprises the following steps: collecting Y', x and Y data of all pixels under a pure color picture of a display panel; where Y' is the luminance value of a pixel and x and Y are the chrominance values of a pixel; the pure color picture of the display panel is the pure color picture under the condition that a plurality of sub-pixels with different colors of each pixel are displayed; selecting any one of Y', x and Y data of all pixels collected under a pure color picture of a display panel as reference data, wherein the pixel with the reference data is a reference pixel; respectively calculating the color difference value of any one of other pixels and a reference pixel by adopting a first calculation method; if the color difference value between any one of the other pixels and the reference pixel is less than or equal to a preset value, retaining all sub-pixel data of the pixel without correction; if the color difference value between any one of the other pixels and the reference pixel is greater than a preset value, taking the preset value as the color difference value between the pixel and the reference pixel, and calculating the compensation values of all the sub-pixels of the pixel by a second calculation method: if the calculated compensation value of the sub-pixel has a solution, correcting according to the calculated compensation value of the sub-pixel; correcting according to the calculated compensation value of the sub-pixel, namely taking the calculated compensation value of the sub-pixel as a standard value of the sub-pixel during actual display; and if the calculated compensation values of the sub-pixels have no solution, reselecting one pixel data as new reference data, and taking the pixel with the new reference data as a new reference pixel until the compensation values of the sub-pixels of all the pixels have solutions, and terminating the loop calculation.
Based on the same invention concept, the invention also provides a pixel chromatic aberration compensation system of the display panel, wherein the pixel chromatic aberration compensation system is used for realizing the pixel chromatic aberration compensation method of the display panel, and the pixel chromatic aberration compensation system at least comprises a light sensing device, a calculation unit and a compensation unit; the light sensing device is used for collecting the brightness data and the chromaticity data of all pixels according to the current brightness and the chromaticity of each pixel under the pure color picture of the display panel and feeding the brightness data and the chromaticity data back to the computing unit; the pure color picture of the display panel is the pure color picture under the condition that a plurality of sub-pixels with different colors of each pixel are displayed; the calculating unit is used for selecting the brightness data and the chrominance data of any one of the collected brightness data and the chrominance data of all the pixels as reference data under a pure color picture of the display panel, the pixel with the reference data is taken as a reference pixel, the color difference values of any one of other pixels and the reference pixel are respectively calculated by adopting a first calculating method, and comparison is carried out: if the color difference value between any pixel in other pixels and the reference pixel is less than or equal to a preset value, retaining all sub-pixel data of the pixel without correction, and feeding the result back to the compensation unit; if the color difference value between any one of the other pixels and the reference pixel is larger than the preset value, when the color difference value between the pixel and the reference pixel is equal to the preset value, the calculating unit calculates the compensation values of all the sub-pixels of the pixel through a second calculating method, judges whether the calculated compensation values of the sub-pixels have solutions or not, and feeds the results back to the compensating unit; the compensation unit is used for correcting according to the calculated compensation value of the sub-pixel when the calculated compensation value of the sub-pixel has a solution so as to adjust the luminous brightness and the chromaticity of each sub-pixel; and correcting according to the calculated compensation value of the sub-pixel, namely taking the calculated compensation value of the sub-pixel as a standard value of the sub-pixel during actual display.
Based on the same inventive concept, the invention also provides a display device comprising the pixel chromatic aberration compensation system of the display panel.
Compared with the prior art, the pixel chromatic aberration compensation method, the pixel chromatic aberration compensation system and the display device of the display panel at least realize the following beneficial effects:
according to the invention, Y', x and Y data of all pixels are collected under the pure color picture that a plurality of sub-pixels with different colors of each pixel of the display panel are in a display state, and the color difference of the sub-pixels with different colors of the display panel can be compensated and corrected under the display of one pure color picture, so that the compensation work efficiency can be improved, and the cost can be saved. According to the invention, the chromaticity difference between different pixels on the display panel and the selected reference pixel is compared with the preset value, and when the chromaticity difference between the selected pixel and the selected reference pixel is just the critical value which cannot be identified by human eyes, the compensation values of all sub-pixels of the pixel are calculated by adopting a calculation method to carry out chromatic aberration compensation correction, so that the phenomenon of uneven brightness of the display panel can be effectively solved, and the yield of the display panel is improved.
Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram illustrating a light transmission principle of a direct-type backlight module in the prior art;
FIG. 2 is a graph showing the luminescence spectrum of the LED point light source in FIG. 1, wherein the luminescence spectrum is excited by a fluorescent film, and the luminescence spectrum is measured at the position B between the LED point light sources and at the position A perpendicular to the LED point light sources;
FIG. 3 is a schematic block diagram of a process of compensating for chromatic aberration of pixels of a display panel according to an embodiment of the present invention;
fig. 4 is a schematic plan view illustrating a display panel according to an embodiment of the present invention;
FIG. 5 is a block diagram of a pixel color difference compensation system of a display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 3 and fig. 4, fig. 3 is a schematic block diagram illustrating a flow of a pixel chromatic aberration compensation method of a display panel according to an embodiment of the present invention, fig. 4 is a schematic plan view illustrating a display panel 0000 according to an embodiment of the present invention, each pixel 10 at least includes a plurality of sub-pixels 101 with different colors;
the compensation method comprises the following steps:
collecting Y', x and Y data of all pixels under a pure color picture of a display panel; where Y' is the luminance value of a pixel and x and Y are the chrominance values of a pixel; the pure color picture of the display panel is the pure color picture under the condition that a plurality of sub-pixels with different colors of each pixel are displayed;
selecting any one of Y', x and Y data of all pixels collected under a pure color picture of a display panel as reference data, wherein the pixel with the reference data is a reference pixel;
respectively calculating the color difference value of any one of other pixels and a reference pixel by adopting a first calculation method;
if the color difference value between any one of the other pixels and the reference pixel is less than or equal to a preset value, retaining all sub-pixel data of the pixel without correction;
if the color difference value between any one of the other pixels and the reference pixel is greater than a preset value, taking the preset value as the color difference value between the pixel and the reference pixel, and calculating the compensation values of all the sub-pixels of the pixel by a second calculation method:
if the calculated compensation value of the sub-pixel has a solution, correcting according to the calculated compensation value of the sub-pixel; correcting according to the calculated compensation value of the sub-pixel, namely taking the calculated compensation value of the sub-pixel as a standard value of the sub-pixel during actual display;
and if the calculated compensation values of the sub-pixels have no solution, reselecting one pixel data as new reference data, and taking the pixel with the new reference data as a new reference pixel until the compensation values of the sub-pixels of all the pixels have solutions, and terminating the loop calculation.
Specifically, in the pixel color difference compensation method for the display panel provided by this embodiment, optionally, under the pure color picture in which a plurality of sub-pixels with different colors of each pixel of the display panel are all in the display state, when the display panel is in a pure white frame (at this time, the red, green, and blue sub-pixels of the display panel are all in a display state), Y' (i.e., luminance value), x, and Y (i.e., chrominance value) data of all pixels are collected, and at this time, the sub-pixels of all colors are in the display state, and then can be adjusted according to different display conditions, if the sub-pixels of all colors are not in the display state, when the compensation calculation is performed on the pixel color difference of the display panel, the luminance value and the chrominance value of a sub-pixel of a certain color that is not displayed may not be compensated, and further, the compensation calculation needs to be performed by repeated operations. Therefore, in the embodiment, by collecting Y', x, and Y data of all pixels in a pure color picture in which a plurality of sub-pixels of different colors of each pixel of the display panel are in a display state, color differences of all sub-pixels of different colors of the display panel can be compensated and corrected in one-time display of the pure color picture, so that the compensation efficiency can be improved, and the cost can be saved.
Then, any one of Y', x and Y data of all pixels collected under the pure color picture of the display panel is selected as reference data, and the pixel with the reference data is taken as a reference pixel; respectively calculating the color difference value of any one of other pixels and the reference pixel by adopting a first calculation method, wherein the color difference value is the difference of colors;
then, comparing the color difference value of any one of the other pixels and the reference pixel with a preset value, wherein the preset value is a value of color difference which can be recognized by human eyes;
if the calculated color difference value between any pixel in the other pixels and the reference pixel is less than or equal to the preset value, the color difference value between any pixel in the selected other pixels and the reference pixel is not up to the extent that the human eye can recognize, that is, the color difference degree between the pixel and the reference pixel is not obvious, and the human eye cannot accurately recognize, so that all sub-pixel data of the pixel can be reserved without correction;
if the calculated color difference value between any one of the other pixels and the reference pixel is larger than a preset value, then the preset value is taken as the color difference value between the pixel and the reference pixel, that is, a critical value that human eyes can not recognize color difference just is taken as the color difference value between the pixel and the reference pixel, and then the compensation values of all sub-pixels of the pixel are calculated by a second calculation method:
if the calculated compensation value of the sub-pixel has a solution, the calculated compensation value of the sub-pixel is used as a standard value of the sub-pixel during actual display, and pixel chromatic aberration compensation correction of the display panel is carried out;
and if the calculated compensation values of the sub-pixels have no solution, reselecting data of one other pixel as new reference data, taking the pixel with the new reference data as a new reference pixel, continuously comparing the color difference value of any one of the calculated other pixels and the new reference pixel with a preset value, continuously calculating, and performing a correction step until the compensation values of the sub-pixels of all the pixels on the display panel have solutions, and terminating the circular calculation.
In the pixel color difference compensation method for the display panel provided by this embodiment, the chromaticity difference between different pixels on the display panel and the selected reference pixel is compared with a preset value, and when the chromaticity difference between the selected pixel and the selected reference pixel is just a critical value that cannot be recognized by human eyes, the compensation values of all sub-pixels of the pixel are calculated by using a calculation method to perform color difference compensation correction, so that the phenomenon of uneven brightness of the display panel can be effectively solved, and the yield of the display panel is improved.
In some optional embodiments, please continue to refer to fig. 3 and 4, in this embodiment, Y ', x, and Y data of all pixels are collected under a pure color frame of the display panel, and at this time, the collected Y', x, and Y data of all pixels are data under a 1931 chromaticity system;
before the first calculation method is adopted to calculate the color difference value between any one of the other pixels and the reference pixel, the method further includes: data under the 1931 chromaticity system are converted into data under the Lab chromaticity system.
This embodiment further explains that the Y', x, Y data of all pixels collected under the pure color picture of the display panel are data under 1931 chromaticity system. Generally, the visual difference of a pixel can be represented by integrating the luminance and the chrominance by three data of a pixel, namely Y', x and Y, but the influence of the three data on the visual difference cannot be measured. Therefore, before the first calculation method is used to calculate the color difference value between any one of the other pixels and the reference pixel, the data in the 1931 chromaticity system needs to be converted into the data in the Lab chromaticity system, and then the color difference value between any one of the other pixels and the reference pixel needs to be calculated. In the study of color perception, the 1931 color system, also known as the CIE1931 color space, is one of the first mathematically defined color spaces, which was created in 1931 by the international commission on illumination (CIE), a direct measure based on human color vision, and serves as the basis for the definition of many other color spaces. Typically, a display specifies three (x, y) coordinates (R, G, B) to define the three primary colors to be used, and the color gamut defined by the triangles formed by these three (x, y) coordinates is the colors that the display can produce, and the luminance information is not contained in the standard CIE1931 chromaticity diagram, but rather, the axis perpendicular to the (x, y) plane, the brighter the color, the smaller the chromaticity range.
The Lab color system is a color model defined by the international commission on illumination (CIE) that theoretically includes all colors visible to the human eye. The Lab colorimetric system was established on the basis of the international standard for color measurement specified by the International Commission on illumination in 1931. In 1976, it was formally named CIE Lab after modification, which is a device-independent color system and a color system based on physiological characteristics, i.e., it means that it describes human visual perception by means of digitization. The L component in the Lab chromaticity system is used for representing the brightness of the pixel, the value range is [0, 100], and the L component represents pure black to pure white; a represents the range from red to green, and the value range is [127, -128 ]; b represents the range from yellow to blue, and the value range is [127, -128 ]. Therefore, the present embodiment adopts the Lab chromaticity system to represent the chromaticity and brightness of each sub-pixel, so that the human visual sense can be described more intuitively through a digital method, the Lab chromaticity system has a color gamut larger than that of a computer display and even human visual sense, and the defined color is the most.
In some alternative embodiments, please continue to refer to fig. 3 and fig. 4, in this embodiment, the conversion formula for converting the data in the 1931 chromaticity system into the data in the Lab chromaticity system is as follows:
in formula 1, Xn、Yn、ZnIs the tristimulus value of the standard light source, and X, Y, Z is the tristimulus value of the collected pixels when displayed; wherein, L is the brightness of the pixel under the Lab colorimetric system, and a and b are two color channels of the pixel under the Lab colorimetric system; f (t) is a functional formula obtained by reacting the compound of formula 1
The value of (2) is calculated as the value of t in formula 2, and the value of (1) is obtained
The calculation result of (2).
This example further illustrates the conversion formula for converting data in 1931 color system into data in Lab color system by using the formula 1
The value of (2) is calculated as the value of t in formula 2, and the value of (1) is obtained
And further obtaining data under a Lab colorimetric system.
In some alternative embodiments, please continue to refer to fig. 3 and 4, in this embodiment, the tristimulus value X, Y, Z of the pixel is calculated by the collected Y', x, Y data of the pixel, and the calculation formula is:
wherein x + y + z is 1.
This embodiment further illustrates how the tristimulus values X, Y, Z of the pixels in the above embodiments are calculated from the acquired Y', x, Y data of the pixels. In the 1931 chromaticity system, the tristimulus value is an indication of the amount of stimulus levels of the three primary colors that cause the human retina to perceive a certain color. Expressed by X (stimulus amount of red primary color), Y (stimulus amount of green primary color), and Z (stimulus amount of blue primary color). According to the trichromatic theory of young-helmholtz, the perception of color is due to the combined result of light stimulation of the three primary colors. In the three primary colors of red, green and blue, the stimulus amounts of red, green and blue are represented by R, G, B, respectively. Since it is impossible to blend all colors existing in nature from the red, green and blue lights selected from the actual spectrum, CIE theoretically assumed that three primary colors, i.e. theoretical three primary colors, which do not exist in nature, are represented by X, Y and Z in 1931 in order to theoretically blend all colors, thereby forming an XYZ colorimetric system. The X primary color corresponds to red-violet having a higher saturation than the spectrum red, the Y primary color corresponds to green having a higher saturation than the spectrum green of 520 nm, and the Z primary color corresponds to blue having a higher saturation than the spectrum blue of 477 nm, and the amounts of stimulus of these three theoretical primary colors are expressed by X, Y, Z, so-called tristimulus values. In the 1931 color system, the coordinates x, y and z are called color coordinates, the sum of which is always equal to 1. Therefore, z can always be represented by x, y, and in order to represent any color, only the values of x and y need to be specified, and the corresponding composition can also be two-dimensional.
In some optional embodiments, please continue to refer to fig. 3 and fig. 4, in this embodiment, a first calculation method is adopted to calculate color difference values of any one of the other pixels and the reference pixel, and a calculation formula of the first calculation method is as follows:
wherein Δ E is a color difference between any one of the other pixels and the reference pixel, and Δ L*L of other pixels*Value and L of reference pixel*Difference between values, Δ a*A for other pixels*A of the value and reference pixel*Difference between values,. DELTA.b*B for other pixels*B of value and reference pixel*The difference between the values.
This embodiment further explains the calculation formula of the first calculation method by L of other pixels*Value and referenceL of the pixel*Difference between values DeltaL*A of other pixels*A of the value and reference pixel*Difference between values Δ a*B of other pixels*B of value and reference pixel*Difference between values Δ b*The color difference value Δ E between any one of the other pixels and the reference pixel can be calculated. In this embodiment, the color difference value Δ E between any one of the other pixels and the reference pixel is calculated by using an instrument and a computer according to a standard color difference formula recommended by the commission international de-eclairage (CIE), so that the color difference value can be represented by an accurate number, and is more intuitive and convenient.
In some optional embodiments, please refer to fig. 3 and 4, in this embodiment, when the color difference value between the pixel and the reference pixel is calculated to be equal to the predetermined value by the second calculation method, in the compensation values of all the sub-pixels of the pixel, the luminance of the sub-pixel is adjusted and compensated by adjusting the gray scale of the sub-pixel, and the chrominance values x and y of the sub-pixel are adjusted and compensated by adjusting the gamma value of the sub-pixel.
In some optional embodiments, please continue to refer to fig. 3 and 4, in this embodiment, the plurality of sub-pixels with different colors at least include a first sub-pixel, a second sub-pixel, and a third sub-pixel;
the calculation formula of the second calculation method is:
r in the formulae 3 and 4x、Ry、RzFor the collected luminance and chrominance values, R _, of the first sub-pixelX、R_Y、R_ZCalculating the tristimulus value of the first sub-pixel; gx、Gy、GzFor the luminance and chrominance values, G _, of the second sub-pixel collectedX、G_Y、G_ZCalculating the tristimulus value of the second sub-pixel; b isx、By、BzFor the luminance and chrominance values of the third sub-pixel, B _X、B_Y、B_ZCalculating the tristimulus value of the third sub-pixel; wx、WyThe chromaticity value of the white point formed by the first sub-pixel, the second sub-pixel and the third sub-pixel.
From said equations 3 and 4, the following three sets of solutions are obtained:
the first set of solutions is:
G_Y＝-(BxGyR_YRy-ByGyR_YRx-BxGyR_YWy+ByGyR_YWx+GyR_YRxWy-GyR_YRyWx)/(BxGyRy-ByGxRy-BxRyWy+ByRyWx+GxRyWy-GyRyWx)，B_Y＝(ByGxR_YRy-ByGyR_YRx-ByGxR_YWy+ByGyR_YWx+ByR_YRxWy-ByR_YRyWx)/(Ry(BxGy-ByGx-BxWy+ByWx+GxWy-GyWx))；
the second set of solutions is:
G_Y＝-(B_YBxGyRy-B_YByGyRx-B_YBxGyWy+B_YByGyWx+B_YGyRxWy-B_YGyRyWx)/(By(RxWy-RyWx+GxRy-GyRx-GxWy+GyWx))，
R_Y＝(B_YBxGyRy-B_YByGxRy-B_YBxRyWy+B_YByRyWx+B_YGxRyWy-B_YGyRyWx)/(ByGxRy-ByGyRx-ByGxWy+ByGyWx+ByRxWy-ByRyWx) (ii) a The third solution is:
R_Y＝-(BxG_YGyRy-ByG_YGxRy-BxG_YRyWy+ByG_YRyWx+G_YGxRyWy-G_YGyRyWx)/(BxGyRy-ByGyRx-BxGyWy+ByGyWx+GyRxWy-Gy*Ry*Wx)，B_Y＝-(ByG_YGxRy-ByG_YGyRx-ByG_YGxWy+ByG_YGyWx+ByG_YRxWy-ByG_YRyWx)/(Gy(RxWy-RyWx+BxRy-ByRx-BxWy+ByWx))；
that is, when the color difference Δ E between any one of the other pixels and the reference pixel is a predetermined value, L of each sub-pixel of the reference pixel is equal to L*、a*、b*If the value is known, it can be obtained by reverse-deducingCorrecting L corresponding to all sub-pixels of the pixel after compensation*、a*、b*The value is further reversely deduced to obtain a chromatic value W of a white point formed by three sub-pixelsx、Wy. By the calculation formula of the second calculation method, the compensation value R _ofthe sub-pixel obtained by calculationY、G_Y、B_YIf there is any one of the three solutions and the chromaticity is not beyond the adjustable range, the R _uof the original sub-pixel is adjustedY、G_Y、B_YAdjusted to the calculated R \uY、G_Y、B_YAnd performing correction compensation.
In some optional embodiments, please continue to refer to fig. 3 and 4, in this embodiment, the preset value is 1.5.
The present embodiment further explains that the desirable value of the preset value is 1.5, and according to the experiment, the color difference value between two pixels, which is generally greater than 1.5, can be recognized by human eyes, therefore, in order to make the color difference value between two pixels unrecognizable by human eyes, the present embodiment may set the preset value to 1.5, so as to determine whether the pixel needs to perform compensation and correction of color difference by comparing the color difference value of any one of the other pixels obtained by calculation with the reference pixel with 1.5.
In some optional embodiments, please refer to fig. 5, fig. 5 is a frame structure diagram of a pixel chromatic aberration compensation system of a display panel according to an embodiment of the present invention, the pixel chromatic aberration compensation system of the present embodiment is used for implementing the pixel chromatic aberration compensation method according to the above embodiments, the pixel chromatic aberration compensation system at least includes a light sensing device 100, a calculating unit 200, and a compensating unit 300;
the light sensing device 100 is used for collecting brightness data and chromaticity data of all pixels according to the current brightness and chromaticity of each pixel under a pure color picture of the display panel, and feeding the brightness data and the chromaticity data back to the computing unit 200; the pure color picture of the display panel is the pure color picture under the condition that a plurality of sub-pixels with different colors of each pixel are displayed;
a calculating unit 200, configured to select, in a pure color picture of the display panel, luminance data and chrominance data of any one of the acquired luminance data and chrominance data of all pixels as reference data, and the pixel with the reference data is a reference pixel, and calculate, by using a first calculating method, a color difference value between any one of the other pixels and the reference pixel, and compare:
if the color difference value between any one of the other pixels and the reference pixel is less than or equal to the predetermined value, the data of all the sub-pixels of the pixel is retained and not corrected, and the result is not fed back to the compensation unit 300;
if the color difference value between any one of the other pixels and the reference pixel is greater than the preset value, when the color difference value between the pixel and the reference pixel is equal to the preset value, the calculating unit 200 calculates the compensation values of all the sub-pixels of the pixel by a second calculating method, determines whether the calculated compensation values of the sub-pixels have solutions, and feeds the results back to the compensating unit 300;
a compensation unit 300, configured to, when the calculated compensation value of the sub-pixel has a solution, perform correction according to the calculated compensation value of the sub-pixel to adjust the luminance and the chromaticity of each sub-pixel; and correcting according to the calculated compensation value of the sub-pixel, namely taking the calculated compensation value of the sub-pixel as a standard value of the sub-pixel during actual display.
Specifically, the pixel color difference compensation system of the display panel provided in this embodiment is, optionally, when the display panel is in a pure white frame (at this time, the red, green, and blue sub-pixels of the display panel are all in a display state), Y' (i.e., luminance value), x, and Y (i.e., chrominance value) data of all pixels are collected, and at this time, the sub-pixels of all colors are in the display state, and then can be adjusted according to different display conditions, if the sub-pixels of all colors are not in the display state, when the compensation calculation is performed on the pixel color difference of the display panel, the luminance value and the chrominance value of a sub-pixel of a certain color that is not displayed may not be compensated, and further, the compensation calculation needs to be performed by repeated operations.
Therefore, the optical sensing device 100 of this embodiment first collects the luminance data and the chromaticity data of all the pixels according to the current luminance and chromaticity of each pixel in the pure color picture in which the plurality of sub-pixels of different colors of each pixel of the display panel are in the display state, and feeds the luminance data and the chromaticity data back to the computing unit 200, so that the color difference of all the sub-pixels of different colors of the display panel can be compensated and corrected in the display of the pure color picture at one time, thereby improving the compensation efficiency and saving the cost.
Then, the calculating unit 200 selects the luminance data and the chrominance data of any one of the acquired luminance data and chrominance data of all the pixels as reference data under the pure color picture of the display panel, and the pixel with the reference data is a reference pixel, and respectively calculates the color difference value between any one of the other pixels and the reference pixel by adopting a first calculating method, wherein the color difference value is the difference of colors; comparing the color difference value of any one of the other pixels and the reference pixel with a preset value, wherein the preset value is a value of color difference which can be recognized by human eyes;
if the calculated color difference value between any pixel in the other pixels and the reference pixel is less than or equal to the preset value, it indicates that the size of the color difference value between any pixel in the selected other pixels and the reference pixel does not reach the degree that can be recognized by human eyes, i.e., it indicates that the degree of color difference between the pixel and the reference pixel is not obvious and human eyes cannot recognize accurately, so that all sub-pixel data of the pixel can be kept without correction, and the result is not fed back to the compensation unit 300;
if the calculated color difference value between any one of the other pixels and the reference pixel is greater than the preset value, at this time, the preset value is taken as the color difference value between the pixel and the reference pixel, that is, the critical value that human eyes can not recognize color difference just is taken as the color difference value between the pixel and the reference pixel, the calculating unit 200 calculates the compensation values of all sub-pixels of the pixel by a second calculating method, judges whether the calculated compensation values of the sub-pixels have solutions, and feeds back the results to the compensating unit 300;
then, when the calculated compensation value of the sub-pixel has a solution, the compensation unit 300 performs pixel color difference compensation correction of the display panel by using the calculated compensation value of the sub-pixel as a standard value of the sub-pixel during actual display to adjust the light emitting brightness and chromaticity of each sub-pixel. When the calculated compensation values of the sub-pixels have no solution, the compensation unit 300 reselects one piece of other pixel data as new reference data, and the pixel with the new reference data is a new reference pixel, continues to compare the color difference value of any one of the other calculated pixels and the new reference pixel with a preset value, continues to calculate, performs the correction step, and terminates the loop calculation until the compensation values of the sub-pixels of all the pixels on the display panel have solutions.
In the pixel color difference compensation system of the display panel provided by this embodiment, the chromaticity difference between different pixels on the display panel and the selected reference pixel is compared with the preset value, and when the chromaticity difference between the selected pixel and the selected reference pixel is just the critical time that cannot be recognized by human eyes, the compensation values of all sub-pixels of the pixel are calculated by using a calculation method to perform color difference compensation correction, so that the phenomenon of uneven brightness of the display panel can be effectively solved, and the yield of the display panel is improved.
It should be noted that, this embodiment merely exemplifies that the pixel chromatic aberration compensation system of the display panel at least includes the optical sensing device 100, the calculating unit 200, and the compensating unit 300, but is not limited to include these three units, and may also include other unit modules capable of implementing the pixel chromatic aberration compensation system, such as a power module, and the like, and the details are not repeated in this embodiment.
In some optional embodiments, referring to fig. 6, fig. 6 is a schematic structural diagram of a display device 1111 provided in the embodiment of the present invention, and the display device 1111 provided in the embodiment of the present invention includes the display panel 0000 provided in the embodiment of the present invention and a pixel color difference compensation system of the display panel. The embodiment of fig. 6 only uses a mobile phone as an example to describe the display device 1111, but it should be understood that the display device 1111 provided in the embodiment of the present invention may be other display devices 1111 having a display function, such as a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device 1111 provided in the embodiment of the present invention has the beneficial effects of the pixel color difference compensation system of the display panel provided in the embodiment of the present invention, and specific descriptions of the pixel color difference compensation system of the display panel in the above embodiments may be specifically referred to, and the details of the embodiment are not repeated herein.
By the above embodiments, it can be known that the pixel chromatic aberration compensation method, the pixel chromatic aberration compensation system, and the display device of the display panel provided by the invention at least achieve the following beneficial effects:
according to the invention, Y', x and Y data of all pixels are collected under the pure color picture that a plurality of sub-pixels with different colors of each pixel of the display panel are in a display state, and the color difference of the sub-pixels with different colors of the display panel can be compensated and corrected under the display of one pure color picture, so that the compensation work efficiency can be improved, and the cost can be saved. According to the invention, the chromaticity difference between different pixels on the display panel and the selected reference pixel is compared with the preset value, and when the chromaticity difference between the selected pixel and the selected reference pixel is just the critical value which cannot be identified by human eyes, the compensation values of all sub-pixels of the pixel are calculated by adopting a calculation method to carry out chromatic aberration compensation correction, so that the phenomenon of uneven brightness of the display panel can be effectively solved, and the yield of the display panel is improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A pixel chromatic aberration compensation method of a display panel is characterized in that each pixel at least comprises a plurality of sub-pixels with different colors;
the compensation method comprises the following steps:
collecting Y', x and Y data of all the pixels under a pure color picture of the display panel; wherein Y' is a luminance value of the pixel and x and Y are chrominance values of the pixel; the pure color picture of the display panel refers to a pure color picture under the condition that a plurality of sub-pixels with different colors of each pixel are displayed;
selecting any one of Y', x and Y data of all the pixels collected under a pure color picture of the display panel as reference data, wherein the pixel with the reference data is a reference pixel;
respectively calculating the color difference value of any one of other pixels and the reference pixel by adopting a first calculation method;
if the color difference value between any one of the other pixels and the reference pixel is less than or equal to a preset value, reserving all sub-pixel data of the pixel without correction;
if the color difference value between any one of the other pixels and the reference pixel is greater than the preset value, taking the preset value as the color difference value between the pixel and the reference pixel, and calculating the compensation values of all the sub-pixels of the pixel by a second calculation method:
if the calculated compensation value of the sub-pixel has a solution, correcting according to the calculated compensation value of the sub-pixel; wherein, the correction according to the calculated compensation value of the sub-pixel is to use the calculated compensation value of the sub-pixel as a standard value of the sub-pixel during actual display;
and if the calculated compensation values of the sub-pixels have no solution, reselecting one pixel data as new reference data, and taking the pixel with the new reference data as a new reference pixel until the compensation values of the sub-pixels of all the pixels have solutions, and terminating the circular calculation.
2. The method for pixel color difference compensation of a display panel according to claim 1,
the Y ', x and Y data of all the pixels are collected under a pure color picture of the display panel, and the collected Y', x and Y data of all the pixels are data under a 1931 chromaticity system;
before the step of calculating the color difference value between any one of the other pixels and the reference pixel by using the first calculation method, the method further includes: and converting the data under the 1931 chromaticity system into data under the Lab chromaticity system.
3. The method for compensating for color difference of pixels of a display panel according to claim 2, wherein the formula for converting the data in 1931 chromaticity system into the data in Lab chromaticity system is as follows:
in formula 1, Xn、Yn、ZnThe tristimulus value of the standard light source is X, Y, Z, which is the collected tristimulus value of the pixel when displaying; wherein L is the brightness of the pixel under the Lab colorimetric system, and a and b are two color channels of the pixel under the Lab colorimetric system; f (t) is a functional formula obtained by reacting the compound of formula 1
The value of (2) is calculated as the value of t in formula 2, and the value of (1) is obtained
The calculation result of (2).
4. The method for compensating color difference of pixels of a display panel according to claim 3, wherein the tristimulus value X, Y, Z of the pixels is determined by the collected Y', x and Y data of the pixelsAnd calculating to obtain the following formula:
wherein x + y + z is 1.
5. The method for pixel color difference compensation of a display panel according to claim 1,
the color difference values of any one of the other pixels and the reference pixel are respectively calculated by adopting a first calculation method, and the calculation formula of the first calculation method is as follows:
wherein Δ E is a color difference value between any one of the other pixels and the reference pixel, and Δ L*Is L of the other pixel*Value and L of the reference pixel*Difference between values, Δ a*Is a of the other pixel*The value of a and a of the reference pixel*Difference between values,. DELTA.b*B for said other pixel*Value and b of the reference pixel*The difference between the values.
6. The method for pixel color difference compensation of a display panel according to claim 1,
when the color difference value between the pixel and the reference pixel is calculated to be equal to the preset value through the second calculation method, in the compensation numerical values of all the sub-pixels of the pixel, the brightness of the sub-pixels is adjusted and compensated through adjusting the gray scale of the sub-pixels, and the chromatic values x and y of the sub-pixels are adjusted and compensated through adjusting the gamma values of the sub-pixels.
7. The method for compensating for color difference of pixels of a display panel according to any one of claims 1 or 6, wherein the plurality of sub-pixels of different colors comprises at least a first sub-pixel, a second sub-pixel, and a third sub-pixel;
the calculation formula of the second calculation method is as follows:
r in the formulae 3 and 4x、Ry、RzFor the collected luminance and chrominance values, R _, of the first sub-pixelX、R_Y、R_ZCalculating the tristimulus value of the first sub-pixel; gx、Gy、GzFor the collected luminance and chrominance values, G _, of the second sub-pixelX、G_Y、G_ZCalculating the tristimulus value of the second sub-pixel; b isx、By、BzFor the collected luminance and chrominance values, B _, of the third sub-pixelX、B_Y、B_ZCalculating the tristimulus value of the third sub-pixel; wx、WyThe chromatic value of a white point formed by the first sub-pixel, the second sub-pixel and the third sub-pixel;
the following three solutions can be obtained by equations 3 and 4:
the first set of solutions is:
G_Y＝-(BxGyR_YRy-ByGyR_YRx-BxGyR_YWy+ByGyR_YWx+GyR_YRxWy-GyR_YRyWx)/(BxGyRy-ByGxRy-BxRyWy+ByRyWx+GxRyWy-GyRyWx)，B_Y＝(ByGxR_YRy-ByGyR_YRx-ByGxR_YWy+ByGyR_YWx+ByR_YRxWy-ByR_YRyWx)/(Ry(BxGy-ByGx-BxWy+ByWx+GxWy-GyWx))；
the second set of solutions is:
G_Y＝-(B_YBxGyRy-B_YByGyRx-B_YBxGyWy+B_YByGyWx+B_YGyRxWy-B_YGyRyWx)/(By(RxWy-RyWx+GxRy-GyRx-GxWy+GyWx))，R_Y＝(B_YBxGyRy-B_YByGxRy-B_YBxRyWy+B_YByRyWx+B_YGxRyWy-B_YGyRyWx)/(ByGxRy-ByGyRx-ByGxWy+ByGyWx+ByRxWy-ByRyWx)；
the third solution is:
R_Y＝-(BxG_YGyRy-ByG_YGxRy-BxG_YRyWy+ByG_YRyWx+G_YGxRyWy-G_YGyRyWx)/(BxGyRy-ByGyRx-BxGyWy+ByGyWx+GyRxWy-Gy*Ry*Wx)，B_Y＝-(ByG_YGxRy-ByG_YGyRx-ByG_YGxWy+ByG_YGyWx+ByG_YRxWy-ByG_YRyWx)/(Gy(RxWy-RyWx+BxRy-ByRx-BxWy+ByWx))；
i.e. the compensation value R _, if calculated, for the sub-pixelY、G_Y、B_YIf there is any one of the three solutions and the chromaticity is not beyond the adjustable range, the R _uof the original sub-pixel is adjustedY、G_Y、B_YAdjusted to the calculated R \uY、G_Y、B_YAnd performing correction compensation.
8. The method of claim 1, wherein the predetermined value is 1.5.
9. A pixel chromatic aberration compensation system of a display panel, wherein the pixel chromatic aberration compensation system is used for realizing the pixel chromatic aberration compensation method of any one of the above claims 1-8, and the pixel chromatic aberration compensation system at least comprises a light sensing device, a calculation unit and a compensation unit;
the light sensing device is used for collecting brightness data and chromaticity data of all pixels according to the current brightness and chromaticity of each pixel under a pure color picture of the display panel and feeding the brightness data and the chromaticity data back to the computing unit; the pure color picture of the display panel is the pure color picture under the condition that a plurality of sub-pixels with different colors of each pixel are displayed;
the calculating unit is configured to select, in a pure color picture of the display panel, luminance data and chrominance data of any one of the acquired luminance data and chrominance data of all the pixels as reference data, and the pixel with the reference data is a reference pixel, and calculate a color difference value between any one of other pixels and the reference pixel by using a first calculating method, and compare:
if the color difference value between any one of the other pixels and the reference pixel is less than or equal to a preset value, retaining all sub-pixel data of the pixel without correction, and feeding the result back to the compensation unit;
if the color difference value between any one of the other pixels and the reference pixel is greater than the preset value, when the color difference value between the pixel and the reference pixel is equal to the preset value, the calculating unit calculates the compensation values of all the sub-pixels of the pixel by a second calculating method, judges whether the calculated compensation values of the sub-pixels have solutions or not, and feeds the results back to the compensating unit;
the compensation unit is used for correcting according to the calculated compensation value of the sub-pixel when the calculated compensation value of the sub-pixel has a solution so as to adjust the luminous brightness and the chromaticity of each sub-pixel; and correcting according to the calculated compensation value of the sub-pixel, namely, taking the calculated compensation value of the sub-pixel as a standard value of the sub-pixel during actual display.
10. A display device characterized by comprising the pixel color difference compensation system of the display panel of claim 9.
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