CN109147712B - Method and system for improving visual angle color cast of display panel - Google Patents
Method and system for improving visual angle color cast of display panel Download PDFInfo
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Abstract
The invention provides a method and a system for improving the visual angle color cast of a display panel, wherein the method comprises the following steps: s1, measuring actual tristimulus values of the corresponding full gray scale red, green, blue and white under the front view angle and the side view angle as original data when the display panel is not subjected to white balance adjustment; s2, setting the RGB gray scale value of 255 gray scale white; s3, calculating the theoretical RGB gray scale value of the full gray scale white balance; s4, calculating actual color coordinate difference data at a front view angle and a side view angle when the display panel displays an image picture under a theoretical RGB gray scale value of full gray scale white balance; s5, calculating difference data between the actual color coordinate difference data and the set specification data as first difference data; s6, judging whether the difference value of the actual color coordinate meets the set specification, if not, adjusting the RGB gray scale value of the 255 gray scale white according to the first difference data, and returning to the step S3. The invention can effectively improve the color cast of the visual angle of the display panel and can not increase the cost of the central control panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method and a system for improving the visual angle color cast of a display panel.
Background
The VA (Vertical Alignment) display screen has the problem of large viewing angle color shift of the bus, and the problem of color shift under the skin color viewing angle is more serious. Aiming at the problems, the design of a display screen is improved; for example: the pixel of the display screen is designed, the pixel of the display screen is modified into a scheme of 8 domains, or a function of improving the visual angle is added on Tcon (also called a logic board, a screen driving board and a central control board) for improvement.
The principle of the 8domain scheme is that when a pixel is prepared, the pixel is divided into a main pixel and a sub-pixel, and the main pixel and the sub-pixel have different area and voltage ratios, so that the main pixel and the sub-pixel show brightness difference, and the color cast effect of a large viewing angle is improved. However, the 8domain solution has a disadvantage that the preparation process includes an etching process, which requires a mask, and the required mask is more complicated and needs to be redesigned, resulting in higher cost.
The function of improving the visual angle is added to the Tcon, and the scheme is that different pixel voltages are applied to adjacent pixels through the Tcon, so that the brightness of the adjacent pixels is different, and the color cast of a large visual angle is improved. The scheme needs hardware expansion on Tcon, so that the cost of the Tcon is increased, and the scheme improves the visual angle, so that when the display panel is in a low gray scale, the problem of flicker occurs, and the image quality is poor.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a method and a system for improving the viewing angle color shift of a display panel, which can effectively improve the viewing angle color shift of the display panel without increasing the cost of a central control board.
The invention provides a method for improving the color cast of a visual angle of a display panel, which comprises the following steps:
s1, measuring actual tristimulus values of the corresponding full gray scale red, green, blue and white under the front view angle and the side view angle as original data when the display panel is not subjected to white balance adjustment;
s2, setting the RGB gray scale value of 255 gray scale white;
s3, calculating theoretical RGB gray scale values of full gray scale white balance according to the set RGB gray scale values of 255 gray scale white and the original data;
s4, calculating actual color coordinate difference data of the image picture under a front view angle and a side view angle when the display panel displays the image picture under the theoretical RGB gray scale value of full gray scale white balance;
s5, calculating difference data between the actual color coordinate difference data and the set specification data as first difference data;
s6, judging whether the difference value of the actual color coordinate meets the set specification according to the first difference data, if not, adjusting the set 255-gray-scale white RGB gray scale value according to the first difference data, and returning to the step S3 until the difference value of the actual color coordinate meets the set specification.
Preferably, step S3 specifically includes the following steps:
calculating the color coordinate of the 255 gray scale white according to the set RGB gray scale value of the 255 gray scale white and the actual tristimulus value of the full gray scale red, green and blue in the original data, taking the color coordinate of the 255 gray scale white as the color coordinate of the full gray scale white, calculating the brightness value of the full gray scale according to a set gamma curve, and calculating the theoretical tristimulus value of the full gray scale white according to the color coordinate of the full gray scale white and the brightness value of the full gray scale;
correcting the calculated theoretical tristimulus value of the full gray scale white according to the original data to obtain the corrected theoretical tristimulus value of the full gray scale white;
and calculating to obtain a theoretical RGB gray scale value of the corresponding full gray scale white balance according to the corrected theoretical tristimulus value of the full gray scale white.
Preferably, the method for correcting the theoretical tristimulus value of the full gray-scale white color obtained by calculation according to the original data to obtain the corrected theoretical tristimulus value of the full gray-scale white color comprises the following steps:
calculating to obtain a correction coefficient of the full gray scale according to the corresponding relation between the actual tristimulus value of the full gray scale white and the actual tristimulus value of the full gray scale red, green and blue in the original data;
and correcting the theoretical tristimulus value of the white color of the full gray scale according to the correction coefficient of the full gray scale.
Preferably, the method for calculating the theoretical RGB gray-scale value of the corresponding full gray-scale white balance according to the corrected theoretical tristimulus value of the full gray-scale white comprises the following steps:
when calculating the theoretical RGB gray scale value of the k gray scale white, firstly searching the m gray scale green with the brightness closest to the k gray scale white from the actual tristimulus values of the full gray scale green of the original data;
then, searching n-gray-scale red and p-gray-scale blue from the actual tristimulus values of the full-gray-scale red and blue of the original data, so that the color coordinate of white consisting of the n-gray-scale red, the p-gray-scale blue and the m-gray-scale green is closest to the color coordinate of white of the k gray-scale;
when the brightness of white consisting of n-gray level red, p-gray level blue and m-gray level green does not accord with the brightness of k-gray level white, selecting n-i1 gray level red, p-i2 gray level blue and m-i3 gray level green to enable the brightness of white consisting of n-i1 gray level red, p-i2 gray level blue and m-i3 gray level green to accord with the brightness of k-gray level white, and taking the finally determined red gray level, green gray level and blue gray level as theoretical RGB gray level values of the k-gray level white; wherein, i1, i2 and i3 are all set correction values.
Preferably, the following steps are further included between steps S3 and S4:
s30, calculating theoretical Yxy values of an image picture displayed on the display panel under a front view angle and a side view angle according to the theoretical RGB gray scale value of full gray scale white balance and the actual tristimulus values of full gray scale red, green and blue in the original data;
step S4 includes the following steps:
when the step S4 is executed for the first time, controlling the display panel to display the image frame under the theoretical RGB gray-scale value of full gray-scale white balance, measuring the actual Yxy value of the image frame under the front-view angle and the side-view angle, calculating the actual color coordinate difference data of the image frame under the front-view angle and the side-view angle according to the actual Yxy value of the image frame under the front-view angle and the side-view angle, calculating the theoretical color coordinate difference data of the image frame under the front-view angle and the side-view angle according to the theoretical Yxy value of the image frame under the front-view angle and the side-view angle, and calculating the difference data between the actual color coordinate difference data and the theoretical color coordinate difference data as the second difference data;
when step S4 is not performed for the first time, the latest actual color coordinate difference data is calculated from the latest theoretical color coordinate difference data and the second difference data.
Preferably, step S30 includes the following steps:
obtaining a theoretical RGB gray scale value of the image picture according to the given RGB gray scale value of the image picture and the theoretical RGB gray scale value of full gray scale white balance;
and calculating theoretical tristimulus values of the image picture according to the theoretical RGB gray scale values of the image picture and the actual tristimulus values of the full gray scale red, green and blue in the original data, and calculating the theoretical Yxy values of the image picture displayed on the display panel at the front view angle and the side view angle according to the calculated theoretical tristimulus values of the image picture.
Preferably, the controlling the display panel to display the image picture at the theoretical RGB gray-scale value of the full gray-scale white balance includes the following steps:
writing the theoretical RGB gray scale value of full gray scale white balance into a central control board for driving a display panel;
the central control board processes the image data signal according to the theoretical RGB gray-scale value of full gray-scale white balance, converts the image data signal into an LVDS signal for driving the display panel, and transmits the LVDS signal to an LVDS receiving chip of the display panel.
The invention provides a system for improving the color cast of a visual angle of a display panel, which comprises: the data acquisition module and the data processing module;
the data acquisition module is used for measuring actual tristimulus values of full gray scale red, green, blue and white corresponding to the display panel at a front view angle and a side view angle when the display panel is not subjected to white balance adjustment as original data, and measuring actual Yxy values of an image picture at the front view angle and the side view angle when the display panel displays the image picture at a theoretical RGB gray scale value of full gray scale white balance;
the data processing module is used for calculating a theoretical RGB gray scale value of full gray scale white balance according to the set RGB gray scale value of 255 gray scale white and the original data, writing the theoretical RGB gray scale value of full gray scale white balance into a central control board for driving the display panel, calculating actual color coordinate difference data of an image frame at a front view angle and a side view angle when the display panel displays the image frame under the theoretical RGB gray scale value of full gray scale white balance, calculating difference data between the actual color coordinate difference data and set specification data as first difference data, judging whether the actual color coordinate difference value meets the set specification according to the first difference data, if not, adjusting the set RGB gray scale value of 255 gray scale white according to the first difference data, and calculating the theoretical RGB gray scale value of full gray scale white balance again according to the adjusted RGB gray scale value of 255 gray scale white and the original data, until the actual color coordinate difference data meets the set specification.
Preferably, the data processing module is configured to calculate a color coordinate of the 255 gray-scale white according to a set RGB gray-scale value of the 255 gray-scale white and an actual tristimulus value of the full gray-scale red, green and blue in the original data, use the color coordinate of the 255 gray-scale white as a color coordinate of the full gray-scale white, calculate a luminance value of the full gray-scale white according to a set gamma curve, calculate a theoretical tristimulus value of the full gray-scale white according to the color coordinate of the full gray-scale white and the luminance value of the full gray-scale white, correct the calculated theoretical tristimulus value of the full gray-scale white according to the original data to obtain a corrected theoretical tristimulus value of the full gray-scale white, and calculate a corresponding theoretical RGB gray-scale value of the full gray-scale white balance according to the corrected theoretical tristimulus value of the full gray-scale white.
Preferably, the data processing module is further configured to calculate a theoretical Yxy value of an image frame displayed on the display panel at the front view angle and the side view angle according to a theoretical RGB gray-scale value of full gray-scale white balance and an actual tristimulus value of full gray-scale red, green and blue in the original data;
and the data processing module is also used for calculating actual color coordinate difference data of the image picture under the front-view angle and the side-view angle according to the actual Yxy values of the image picture under the front-view angle and the side-view angle, calculating theoretical color coordinate difference data of the image picture under the front-view angle and the side-view angle according to the theoretical Yxy values of the image picture under the front-view angle and the side-view angle, calculating difference data between the actual color coordinate difference data and the theoretical color coordinate difference data to serve as second difference data, and calculating to obtain latest actual color coordinate difference data according to the latest theoretical color coordinate difference data and the second difference data.
The implementation of the invention has the following beneficial effects: the invention provides a method and a system for improving the visual angle color cast of a display panel, firstly measuring tristimulus values of four colors of full gray scale red, green, blue and white corresponding to the display panel under a front view angle and a side view angle when the display panel is not subjected to white balance adjustment as original data, resetting RGB gray scale value of 255 gray scale white, calculating theoretical RGB gray scale value of the full gray scale white balance according to the RGB gray scale value of the 255 gray scale white and the original data, thus leading the theoretical RGB gray scale value of the full gray scale white balance to be closer to the requirement of the white balance of the display panel, detecting whether actual color coordinate difference data of an image picture under the front view angle and the side view angle are in accordance with the specification when the display panel displays the image picture under the theoretical RGB gray scale value of the full gray scale white balance, if so, determining the adjustment direction of the RGB gray scale value of the 255 gray scale white according to the difference data between the actual color coordinate difference data and the set specification value, and then adjust the theoretical RGB gray scale value of full gray scale white balance, can avoid adjusting blindly like this, and then can save the time of adjusting, make the display panel meet the requirement of white balance finally, and the visual angle colour cast of display panel accords with the specification in addition, has solved the problem of the big visual angle colour cast of display panel.
The invention only needs to write the calculated full gray scale theoretical RGB gray scale value into the central control board, does not need to expand the hardware of the central control board, does not need to increase the cost of the central control board, and does not have the problem of flickering of low gray scale image pictures.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for improving a viewing angle color shift of a display panel according to the present invention.
Fig. 2 is a schematic block diagram of a system for improving the viewing angle color shift of a display panel according to the present invention.
Detailed Description
The invention provides a method for improving the color cast of a viewing angle of a display panel, as shown in fig. 1, the method comprises the following steps:
s1, measuring the actual tristimulus values of the full gray scale red, green, blue and white corresponding to the front view angle and the side view angle when the display panel is not adjusted for white balance, and using the actual tristimulus values as the original data. Here, the tristimulus values may be measured by a color analyzer, and the selected side viewing angle may be 30 degrees, 45 degrees, 60 degrees, or the like.
S2, setting the RGB gray scale value of 255 gray scale white; for example, the gray scale values of 255 gray-scale white can be set to 255, 254, and 254, i.e., 255 gray-scale white is composed of 255 gray-scale red, 254 gray-scale green, and 254 gray-scale blue.
And S3, calculating the theoretical RGB gray scale value of the full gray scale white balance according to the set RGB gray scale value of the 255 gray scale white and the original data.
S4, calculating the actual color coordinate difference data of the image frame at the front view angle and the side view angle when the display panel displays the image frame at the theoretical RGB gray scale value of the full gray scale white balance, where the actual color coordinate difference data is, for example, x1y1 at the front view angle and x2y2 at the side view angle, the actual color coordinate difference data may include △ x and △ y, △ x-x 1-x2, and △ y 1-y2., where the image frame is preferably a skin color image.
S5, calculating difference data between the actual color coordinate difference data and the set specification data as first difference data.
S6, judging whether the difference value of the actual color coordinate meets the set specification according to the first difference data, if not, adjusting the set 255-gray-scale white RGB gray scale value according to the first difference data, and returning to the step S3 until the difference value of the actual color coordinate meets the set specification.
The above steps S1 to S6 are performed in this order.
For example, the actual color coordinates of the image at the front view angle are x1y1, the actual color coordinates at the side view angle are x2y2, the first difference data includes the difference value △ x between the front view angle and the side view angle is x1-x2, the set specification value △ x is not more than 0.03, the set specification value can be 0.03, if △ x is greater than 0.03, the set 255-gray-scale white RGB gray scale value is readjusted if the difference value △ x is determined not to meet the set specification, and the 255-gray-scale white RGB gray scale value is adjusted in a direction of decreasing △ x.
More specifically, the gray scale value of R or B in the RGB gray scale values of the 255 gray scale white may be adjusted up or down, and then the change direction of the difference value △ x is obtained, so that the relationship between the change direction of the gray scale value of R or B and the change direction of △ x can be known, and the adjustment of the subsequent RGB gray scale values of the 255 gray scale white may be facilitated.
Step S3 specifically includes the following steps:
according to the set RGB gray scale value of the 255 gray scale white and the actual tristimulus value of the full gray scale red, green and blue in the original data, calculating the color coordinate of the 255 gray scale white, taking the color coordinate of the 255 gray scale white as the color coordinate of the full gray scale white, and according to the set gamma curve, calculating the brightness value of the full gray scale, so that the brightness value of the full gray scale meets the gamma curve, and according to the color coordinate of the full gray scale white and the brightness value of the full gray scale white, calculating the theoretical tristimulus value of the full gray scale white.
And correcting the calculated theoretical tristimulus value of the full gray scale white according to the original data to obtain the corrected theoretical tristimulus value of the full gray scale white.
And calculating to obtain a theoretical RGB gray scale value of the corresponding full gray scale white balance according to the corrected theoretical tristimulus value of the full gray scale white.
Correcting the theoretical tristimulus value of the full gray scale white obtained by calculation according to the original data to obtain the corrected theoretical tristimulus value of the full gray scale white, and the method comprises the following steps:
calculating to obtain a correction coefficient of the full gray scale according to the corresponding relation between the actual tristimulus value of the full gray scale white and the actual tristimulus value of the full gray scale red, green and blue in the original data;
and correcting the theoretical tristimulus value of the white color of the full gray scale according to the correction coefficient of the full gray scale.
For example, 255-level white is composed of 255-level red, 254-level green, and 254-level blue, and the tristimulus values of 255-level red in the original data are XR255 and YR255、ZR255The tristimulus value of 255 gray-scale green is XG255、YG255、ZG255The tristimulus value of 255 gray level blue is XB255、YB255、ZB255The tristimulus value of 255 gray-scale white is XW255、YW255、ZW255The tristimulus value of 254 gray level red in the original data is XR254、YR254、ZR254The tristimulus value of 254 gray level green is XG254、YG254、ZG254And the tristimulus value of 254 gray blue is XB254、YB254、ZB254The tristimulus value of 254 gray white is XW254、YW254、ZW254。
Then it is determined that,255the theoretical tristimulus value of gray-scale white is XW255’、YW255’、ZW255', can be calculated as: XW255’＝XR255+XG254+XB254，YW255’＝YR255+YG254+YB254，ZW255’＝ZR255+ZG254+ZB254。
According to the theoretical tristimulus value of the white with the 255 gray scales, the color coordinate xy of the white with the 255 gray scales can be calculated, wherein x is XW255’/(XW255’+YW255’+ZW255’)，y＝YW255’/(XW255’+YW255’+ZW255') and the color coordinates of the full gray white are xy.
Setting the brightness of the full gray white to conform to the gamma curve, and setting the corresponding gamma value to be 2.2 +/-0.2, so as to obtain the brightness value of the full gray white according to the color coordinate and brightness of the full grayThe value of the three-stimulus can be calculated to obtain the theoretical tri-stimulus value of the full gray scale white balance. For example, the k gray scale white theory tristimulus value is set to XWk’、YWk’、ZWk', wherein x ═ XWk’/(XWk’+YWk’+ZWk’)，y＝YWk’/(XWk’+YWk’+ZWk’)，YWkThe' is the brightness value of the white of the k gray scale, xy is known, and the theoretical tristimulus value of the white of the k gray scale can be finally obtained by calculation, wherein k is more than or equal to 0 and less than or equal to 255.
Three correction coefficients for correcting the theoretical tristimulus values of the white color of the k gray scale can be obtained according to the original data, and the actual tristimulus value of the red color of the k gray scale is XRk、YRk、ZRkThe actual tri-stimulus value of the k gray level green is XGk、YGk、ZGkThe actual tristimulus value of k gray level blue is XBk、YBk、ZBkThe actual tristimulus value of k gray scale white is XWk、YWk、ZWk。
The three correction coefficients for correcting the theoretical tristimulus value of the k gray level white are respectively: XWk/(XRk+XGk+XBk)、YWk/(YRk+YGk+YBk)、ZWk/(ZRk+ZGk+ZBk) The theoretical tristimulus value XW of the white of the k gray scale is corrected by the three coefficients respectivelyk’、YWk’、ZWk' the theoretical tristimulus value of the corrected k gray scale white is XWk*XWk’/(XRk+XGk+XBk)、YWk*YWk’/(YRk+YGk+YBk)、ZWk*ZWk’/(ZRk+ZGk+ZBk)Since the actual tristimulus value of k gray level white is not equal to the actual tristimulus value of k gray level red, the actual tristimulus value of k gray level green, and the actual tristimulus value of k gray level blue in the actual values, for example, XWk≠XRk+XGk+XBk，YWk≠YRk+YGk+YBk，ZWk≠ZRk+ZGk+ZBkTherefore, the calculated theoretical tristimulus values of the white color of the k gray scale need to be corrected through correction coefficients, and the corresponding correction coefficients are obtained according to the difference between the actual tristimulus values of the white color of the k gray scale and the actual tristimulus values of the red, green and blue colors of the k gray scale in the actual values, so that the corrected theoretical tristimulus values of the white color of the k gray scale can be more accurate.
According to the corrected theoretical tristimulus value of the full gray-scale white, the corresponding theoretical RGB gray-scale value of the full gray-scale white balance is calculated and obtained, and the method comprises the following steps:
when the theoretical RGB gray scale value of the white of the k gray scale is calculated, m gray scale green with the brightness closest to the white of the k gray scale is found out from the actual tristimulus values of the full gray scale green of the original data;
then, n gray scale red and p gray scale blue are found out from the actual tristimulus values of the full gray scale red and blue of the original data, so that the color coordinate of white consisting of the n gray scale red, the p gray scale blue and the m gray scale green is closest to the color coordinate of the k gray scale white;
when the brightness of white composed of n-gray level red, p-gray level blue and m-gray level green does not accord with the brightness of k-gray level white, selecting n-i1 gray level red, p-i2 gray level blue and m-i3 gray level green, so that the brightness of white composed of n-i1 gray level red, p-i2 gray level blue and m-i3 gray level green accords with the brightness of k-gray level white, and according to the finally determined red gray level, green gray level and blue gray level as the theoretical RGB gray level value of k-gray level white, here, i1, i2 and i3 are all set correction values, i1 can be positive or negative, i2 can be positive or negative, i3 can be positive or negative, i1, i2 and i3 can be the same or different, and i1, i2 and i3 are preferably three same numbers.
Generally, the luminance of the display panel is the most critical point for determining the luminance of the display panel, and therefore, the luminance of the white of the k gray level is first determined to be the green gray level, i.e., the gray level value of G among the RGB gray level values. And analyzing the white color coordinate xy of the k gray scale, and searching the tri-stimulus value of red and blue of each gray scale in the original data to ensure that the color coordinate of the combined red, green and blue three colors is closest to the white color coordinate xy of the k gray scale, so that the red gray scale, the green gray scale and the blue gray scale are preliminarily determined, for example, n gray scale red, p gray scale blue and m gray scale green are preliminarily determined, and the corresponding RGB gray scale values are n, m and p.
Of course, the brightness of the white composed of n-gray level red, p-gray level blue and m-gray level green may be different from the brightness of the white of k-gray level, generally, the brightness of the white composed of n-gray level red, p-gray level blue and m-gray level green is higher than the brightness of the white of k-gray level, then the brightness of the white composed of the red gray level, the green gray level and the blue gray level is adjusted down by i gray levels, for example, by 1 gray level, for example, it is finally determined that the brightness of the white composed of the n-i gray level red, the p-i gray level blue and the m-i gray level green meets the brightness of the white. At this time, the determined color coordinates of the white composed of the n-i gray scale red, the p-i gray scale blue and the m-i gray scale green are generally consistent with the color coordinates of the k gray scale white. If the determined color coordinate of the white composed of the n-i gray scale red, the p-i gray scale blue and the m-i gray scale green does not accord with the color coordinate of the k gray scale white, the adjustment is carried out again by the method for determining the red gray scale and the blue gray scale, and finally the theoretical RGB gray scale value of the k gray scale white can be determined.
Further, the following steps are also included between steps S3 and S4:
and S30, calculating theoretical Yxy values of the image picture displayed on the display panel under the front view angle and the side view angle according to the theoretical RGB gray scale value of the full gray scale white balance and the actual tristimulus values of the full gray scale red, green and blue in the original data. Y in Yxy, that is, the value of Y in tristimulus values XYZ, represents luminance, and xy is a color coordinate of a color.
Step S4 includes the following steps:
when the step S4 is executed for the first time, the display panel is controlled to display the image frame at the theoretical RGB gray-scale values of the full gray-scale white balance, and the actual Yxy values of the image frame at the front-view angle and the side-view angle are measured, and the actual color coordinate difference data of the image frame at the front-view angle and the side-view angle are calculated according to the actual Yxy values of the image frame at the front-view angle and the side-view angle, and the theoretical color coordinate difference data of the image frame at the front-view angle and the side-view angle are calculated according to the theoretical Yxy values of the image frame at the front-view angle and the side-view angle, and the difference data between the actual color coordinate difference data and the theoretical color coordinate difference data is also calculated as the second difference data.
When step S4 is not executed for the first time, the latest actual color coordinate difference data is calculated from the latest theoretical color coordinate difference data and the second difference data.
For example, the actual Yxy values of the image frame at the front view angle and the side view angle include actual color coordinates X1Y1 at the front view angle and actual color coordinates X2Y2 at the side view angle, the theoretical Yxy values of the image frame at the front view angle and the side view angle include theoretical color coordinates X3Y3 at the front view angle and theoretical color coordinates X4Y4 at the side view angle, here, the actual color coordinate difference △ X ═ X1-X2, △ Y ═ Y1-Y2 at the front view angle and the side view angle can be calculated, the theoretical color coordinate difference △ X ' × 3-X4, △ Y ' ═ Y △ -Y △ at the front view angle and the side view angle can be calculated, the difference △ X between △ X and △ X ' can be calculated, and the theoretical color coordinate difference △ Y between △ Y and △ Y ' can be calculated, the theoretical color coordinate difference △ Y and the side view angle can be calculated by using the theoretical xy coordinates and the theoretical color coordinates △ Y ' and the theoretical color coordinates can be calculated, and the theoretical color coordinates can be calculated by the theoretical color compensation analyzer and the theoretical color coordinate calculation under the real-based on the real-time of the real-ideal color coordinate calculation and the real-ideal-angle of the real-ideal.
Further, step S30 includes the following steps:
obtaining a theoretical RGB gray scale value of the image picture according to the given RGB gray scale value of the image picture and the theoretical RGB gray scale value of full gray scale white balance;
and calculating theoretical tristimulus values of the image picture according to the theoretical RGB gray scale values of the image picture and actual tristimulus values of full gray scale red, green and blue in the original data, and calculating theoretical Yxy values of the image picture displayed on the display panel at the front view angle and the side view angle according to the theoretical tristimulus values of the image picture obtained by calculation.
For example, given RGB gray-scale values a, b, and c of the image frame, the theoretical RGB gray-scale values of the a-gray-scale white color are XWa, YWa, and ZWa, the theoretical RGB gray-scale values of the b-gray-scale white color are XWb, YWb, and ZWb, and the theoretical RGB gray-scale values of the c-gray-scale white color are XWc, YWc, and ZWc, and the theoretical RGB gray-scale values of the image frame are XWa, YWb, and ZWc.
The method for controlling the display panel to display the image picture under the theoretical RGB gray scale value of full gray scale white balance comprises the following steps:
writing the theoretical RGB gray scale value of full gray scale white balance into a central control panel (namely Tcon) for driving a display panel;
the central control board processes the image data signal according to the theoretical RGB gray-scale value of full gray-scale white balance, converts the image data signal into an LVDS (Low Voltage Differential Signaling) signal for driving the display panel, and transmits the LVDS signal to an LVDS receiving chip of the display panel.
The present invention also provides a system for improving the viewing angle color shift of a display panel, as shown in fig. 2, the system 1 includes: data acquisition module 11, data processing module 12.
The data acquisition module 11 is configured to measure actual tristimulus values of full gray levels red, green, blue, and white corresponding to the front view angle and the side view angle of the display panel when the display panel is not adjusted in white balance, as original data, and measure actual Yxy values of the image frame at the front view angle and the side view angle when the display panel displays the image frame at the theoretical RGB gray level value of full gray level white balance. The data acquisition module 11 may be a color analyzer.
The data processing module 12 is configured to calculate a theoretical RGB gray scale value of full gray scale white balance according to the set 255 gray scale white RGB gray scale value and the original data, write the theoretical RGB gray scale value of full gray scale white balance into the central control board 2 for driving the display panel, calculate actual color coordinate difference data of the image frame at the front view angle and the side view angle when the display panel displays the image frame under the theoretical RGB gray scale value of full gray scale white balance, calculate difference data between the actual color coordinate difference data and the set specification data as first difference data, determine whether the actual color coordinate difference value meets the set specification according to the first difference data, adjust the set 255 gray scale white gray scale value according to the first difference data if the actual color coordinate difference value does not meet the set specification, and calculate the theoretical RGB gray scale value of full gray scale white balance again according to the adjusted 255 gray scale white RGB gray scale value and the original data, until the actual color coordinate difference data meets the set specification.
Further, the data processing module 12 is configured to calculate a color coordinate of the 255 gray-scale white according to the set RGB gray-scale value of the 255 gray-scale white and an actual tristimulus value of the full gray-scale red, green and blue in the original data, calculate a luminance value of the full gray-scale white according to a set gamma curve, calculate a theoretical tristimulus value of the full gray-scale white according to the color coordinate of the full gray-scale white and the luminance value of the full gray-scale white, correct the calculated theoretical tristimulus value of the full gray-scale white according to the original data to obtain a corrected theoretical tristimulus value of the full gray-scale white, and calculate a corresponding theoretical RGB gray-scale value of the full gray-scale white balance according to the corrected theoretical tristimulus value of the full gray-scale white.
Further, the data processing module 12 is further configured to calculate a theoretical Yxy value of an image frame displayed on the display panel at the front view angle and the side view angle according to the theoretical RGB gray-scale value of the full gray-scale white balance and the actual tristimulus value of the full gray-scale red, green, and blue in the original data.
And the data processing module 12 is further configured to calculate actual color coordinate difference data of the image frame at the front view angle and the side view angle according to the actual Yxy values of the image frame at the front view angle and the side view angle, calculate theoretical color coordinate difference data of the image frame at the front view angle and the side view angle according to the theoretical Yxy values of the image frame at the front view angle and the side view angle, calculate difference data between the actual color coordinate difference data and the theoretical color coordinate difference data as second difference data, and calculate the latest actual color coordinate difference data according to the latest theoretical color coordinate difference data and the second difference data.
In summary, the method and system for improving the viewing angle color shift of the display panel provided by the invention measure the tristimulus values of the four colors of full gray scale red, green, blue and white corresponding to the front viewing angle and the side viewing angle as the original data when the display panel is not adjusted for white balance, reset the RGB gray scale value of 255 gray scale white, calculate the theoretical RGB gray scale value of the full gray scale white balance according to the RGB gray scale value of 255 gray scale white and the original data, so that the theoretical RGB gray scale value of the full gray scale white balance can be closer to the requirement of the white balance of the display panel, detect whether the actual color coordinate difference data of the image frame at the front viewing angle and the angle meet the specification when the image frame is displayed by the display panel at the theoretical RGB gray scale value of the full gray scale white balance, if not, determine the adjustment direction of the RGB gray scale value of 255 white gray scale according to the difference data of the actual color coordinate and the difference data of the set specification value, and then adjust the theoretical RGB gray scale value of full gray scale white balance, can avoid adjusting blindly like this, and then can save the time of adjusting, make the display panel meet the requirement of white balance finally, and the visual angle colour cast of display panel accords with the specification in addition, has solved the problem of the big visual angle colour cast of display panel.
The invention only needs to write the calculated full gray scale theoretical RGB gray scale value into the central control board, does not need to expand the hardware of the central control board, hardly needs to increase the cost of the central control board, and does not have the problem of flickering low gray scale image pictures.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. A method for improving the color shift of the visual angle of a display panel is characterized by comprising the following steps:
s1, measuring actual tristimulus values of the corresponding full gray scale red, green, blue and white under the front view angle and the side view angle as original data when the display panel is not subjected to white balance adjustment;
s2, setting the RGB gray scale value of 255 gray scale white;
s3, calculating a color coordinate of the 255 gray scale white according to the set 255 gray scale white RGB gray scale value and the actual tristimulus value of the full gray scale red, green and blue in the original data, taking the 255 gray scale white color coordinate as the color coordinate of the full gray scale white, calculating the brightness value of the full gray scale according to a set gamma curve, and calculating the theoretical tristimulus value of the full gray scale white according to the full gray scale white color coordinate and the brightness value of the full gray scale; correcting the calculated theoretical tristimulus value of the full gray scale white according to the original data to obtain the corrected theoretical tristimulus value of the full gray scale white; calculating to obtain a theoretical RGB gray scale value of the corresponding full gray scale white balance according to the corrected theoretical tristimulus value of the full gray scale white;
s30, calculating theoretical Yxy values of an image picture displayed on the display panel under a front view angle and a side view angle according to the theoretical RGB gray scale value of full gray scale white balance and the actual tristimulus values of full gray scale red, green and blue in the original data;
s4, calculating actual color coordinate difference data of the image picture under a front view angle and a side view angle when the display panel displays the image picture under the theoretical RGB gray scale value of full gray scale white balance; when the step S4 is executed for the first time, controlling the display panel to display the image frame under the theoretical RGB gray-scale value of full gray-scale white balance, measuring the actual Yxy value of the image frame under the front-view angle and the side-view angle, calculating the actual color coordinate difference data of the image frame under the front-view angle and the side-view angle according to the actual Yxy value of the image frame under the front-view angle and the side-view angle, calculating the theoretical color coordinate difference data of the image frame under the front-view angle and the side-view angle according to the theoretical Yxy value of the image frame under the front-view angle and the side-view angle, and calculating the difference data between the actual color coordinate difference data and the theoretical color coordinate difference data as the second difference data; when the step S4 is not executed for the first time, calculating the latest actual color coordinate difference data according to the latest theoretical color coordinate difference data and the second difference data;
s5, calculating difference data between the actual color coordinate difference data and the set specification data as first difference data;
s6, judging whether the difference value of the actual color coordinate meets the set specification according to the first difference data, if not, adjusting the set 255-gray-scale white RGB gray scale value according to the first difference data, and returning to the step S3 until the difference value of the actual color coordinate meets the set specification.
2. The method as claimed in claim 1, wherein the step of correcting the calculated theoretical tristimulus value of the full gray-scale white color according to the original data to obtain the corrected theoretical tristimulus value of the full gray-scale white color comprises the steps of:
calculating to obtain a correction coefficient of the full gray scale according to the corresponding relation between the actual tristimulus value of the full gray scale white and the actual tristimulus value of the full gray scale red, green and blue in the original data;
and correcting the theoretical tristimulus value of the white color of the full gray scale according to the correction coefficient of the full gray scale.
3. The method as claimed in claim 1, wherein the calculating of the theoretical RGB gray level value of the corresponding full gray level white balance according to the theoretical tristimulus value of the modified full gray level white comprises the following steps:
when calculating the theoretical RGB gray scale value of the k gray scale white, firstly searching the m gray scale green with the brightness closest to the k gray scale white from the actual tristimulus values of the full gray scale green of the original data;
then, searching n-gray-scale red and p-gray-scale blue from the actual tristimulus values of the full-gray-scale red and blue of the original data, so that the color coordinate of white consisting of the n-gray-scale red, the p-gray-scale blue and the m-gray-scale green is closest to the color coordinate of white of the k gray-scale;
when the brightness of white consisting of n-gray level red, p-gray level blue and m-gray level green does not accord with the brightness of k-gray level white, selecting n-i1 gray level red, p-i2 gray level blue and m-i3 gray level green to enable the brightness of white consisting of n-i1 gray level red, p-i2 gray level blue and m-i3 gray level green to accord with the brightness of k-gray level white, and taking the finally determined red gray level, green gray level and blue gray level as theoretical RGB gray level values of the k-gray level white; wherein, i1, i2 and i3 are all set correction values.
4. The method of claim 1, wherein the step S30 comprises the following steps:
obtaining a theoretical RGB gray scale value of the image picture according to the given RGB gray scale value of the image picture and the theoretical RGB gray scale value of full gray scale white balance;
and calculating theoretical tristimulus values of the image picture according to the theoretical RGB gray scale values of the image picture and the actual tristimulus values of the full gray scale red, green and blue in the original data, and calculating the theoretical Yxy values of the image picture displayed on the display panel at the front view angle and the side view angle according to the calculated theoretical tristimulus values of the image picture.
5. The method as claimed in claim 4, wherein the step of controlling the display panel to display the image frame under the theoretical RGB gray scale value of full gray scale white balance comprises the steps of:
writing the theoretical RGB gray scale value of full gray scale white balance into a central control board for driving a display panel;
the central control board processes the image data signal according to the theoretical RGB gray-scale value of full gray-scale white balance, converts the image data signal into an LVDS signal for driving the display panel, and transmits the LVDS signal to an LVDS receiving chip of the display panel.
6. A system for improving viewing angle color shift of a display panel, comprising: the data acquisition module and the data processing module;
the data acquisition module is used for measuring actual tristimulus values of full gray scale red, green, blue and white corresponding to the display panel at a front view angle and a side view angle when the display panel is not subjected to white balance adjustment as original data, and measuring actual Yxy values of an image picture at the front view angle and the side view angle when the display panel displays the image picture at a theoretical RGB gray scale value of full gray scale white balance;
the data processing module is used for calculating the color coordinate of the 255 gray scale white according to the set RGB gray scale value of the 255 gray scale white and the actual tristimulus values of the full gray scale red, green and blue in the original data, and the color coordinate of the 255 gray scale white is used as the color coordinate of the full gray scale white, and the brightness value of the full gray scale is calculated according to the set gamma curve, and the theoretical tristimulus value of the full gray scale white is calculated according to the color coordinate of the full gray scale white and the brightness value of the full gray scale, and then according to the original data, correcting the theoretical tristimulus value of the full gray scale white obtained by calculation to obtain the corrected theoretical tristimulus value of the full gray scale white, and calculating to obtain the corresponding theoretical RGB gray scale value of the full gray scale white balance according to the corrected theoretical tristimulus value of the full gray scale white, writing the theoretical RGB gray scale value of the full gray scale white balance into a central control board for driving the display panel;
the data processing module is further used for calculating theoretical Yxy values of an image picture displayed on the display panel under a front view angle and a side view angle according to a theoretical RGB gray scale value of full gray scale white balance and an actual tristimulus value of full gray scale red, green and blue in the original data; and when calculating the display panel to display the image picture under the theoretical RGB gray scale value of full gray scale white balance, calculating the actual color coordinate difference data of the image picture under the front view angle and the side view angle according to the actual Yxy value of the image picture under the front view angle and the side view angle, calculating the theoretical color coordinate difference data of the image picture under the front view angle and the side view angle according to the theoretical Yxy value of the image picture under the front view angle and the side view angle, calculating the difference data between the actual color coordinate difference data and the set specification data as first difference data, calculating the difference data between the actual color coordinate difference data and the theoretical color coordinate difference data as second difference data, and calculating the latest actual color coordinate difference data according to the latest theoretical color coordinate difference data and the second difference data, and judging whether the difference value of the actual color coordinate meets the set specification or not according to the first difference data, if not, adjusting the set RGB gray scale value of the 255 gray scale white according to the first difference data, and calculating the theoretical RGB gray scale value of the full gray scale white balance again according to the adjusted RGB gray scale value of the 255 gray scale white and the original data until the difference value of the actual color coordinate meets the set specification.
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