CN109752869B - Method for detecting optical performance of liquid crystal WRGB screen - Google Patents
Method for detecting optical performance of liquid crystal WRGB screen Download PDFInfo
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Abstract
The invention relates to the field of liquid crystal display, and discloses a method for detecting optical performance of a liquid crystal WRGB screen, which is beneficial to later-stage image quality debugging and improvement of the subjective effect of the whole machine. The invention forms an RGB white field only lighted by R, G, B sub-pixels and a W white field only lighted by W sub-pixels through the input control of a test signal, and respectively detects the color coordinate and the brightness value of the RGB white field and the color coordinate and the brightness value of the W white field; and judging whether the WRGB screen meets the performance requirement on the difference between the RGB white field and the W white field by comparing the difference between the color coordinates of the RGB white field and the color coordinates of the W white field with a preset threshold of color coordinate difference and comparing the difference between the brightness value of the RGB white field and the brightness value of the W white field with a preset threshold of brightness difference.
Description
Technical Field
The invention relates to the field of liquid crystal display, in particular to a method for detecting optical performance of a liquid crystal WRGB screen.
Background
The liquid crystal screen module is formed by combining a screen, a light bar, a membrane, reflecting paper, a diffusion plate or a light guide plate and the like, and the optical performance of the screen module is also influenced by the factors. For WRGB screens, the final optical performance of the screen module can only be met by adjusting the light bar, the membrane, the reflective paper, the diffuser plate, or the light guide plate. When the optical performance of the screen module cannot meet the requirements by adjusting the parameters of the light bar, the diaphragm, the reflective paper, the diffusion plate or the light guide plate, the screen (OC) needs to be adjusted and improved (the optical material of the OC is adjusted). At present, a television manufacturer does not have a good method for detecting the optical performance of the WRGB screen, and is not convenient for the television manufacturer to deeply research the influence of the optical performance of the WRGB screen on later-stage image quality debugging and the whole machine subjective effect.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for detecting the optical performance of the liquid crystal WRGB screen is beneficial to later-stage image quality debugging and improvement of the subjective effect of the whole machine.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the method for detecting the optical performance of the liquid crystal WRGB screen comprises the following steps:
a. inputting a test signal to a WRGB screen, and only lightening R, G, B sub-pixel points to form an RGB white field;
b. testing and recording color coordinates and brightness values of the RGB white field;
c. inputting a test signal to a WRGB screen, and only lightening W sub pixel points to form a W white field;
d. testing and recording the color coordinate and the brightness value of the W white field;
e. comparing the color coordinates of the RGB white field with the color coordinates of the W white field to obtain a color coordinate difference value;
f. comparing the brightness value of RGB white with the brightness value of W white field to obtain a brightness difference value;
g. and judging whether the optical performance of the WRGB screen is qualified or not according to the color coordinate difference value and the brightness difference value.
As a further optimization, in step a, a test signal is input to the WRGB screen through the test tool, before the test signal is input, the luminance value of R, G, B subpixel points in the test signal is set to be the maximum in the test tool, and the luminance value of W subpixel points is set to be 0 in the test tool.
As a further optimization, in step c, inputting a test signal to the WRGB screen through the test tool, before inputting the test signal, setting the luminance value of the W sub-pixel in the test signal to be maximum in the test tool, and setting the luminance value of the R, G, B sub-pixel to be 0.
As a further optimization, in step g, the color coordinate difference and the brightness difference judge whether the optical performance of the WRGB screen is qualified, specifically including:
comparing the color coordinate difference value with a preset threshold value of the color coordinate difference value, and comparing the brightness difference value with a preset threshold value of the brightness difference value;
if the color coordinate difference value is smaller than a preset threshold value of the color coordinate difference value and the brightness difference value is smaller than a preset brightness difference value, judging that the optical performance of the WRGB screen is qualified; otherwise, judging that the optical performance of the WRGB screen is unqualified.
As a further optimization, in step g, if the optical performance of the WRGB screen is determined to be unqualified, the screen manufacturer is required to correct and improve the optical material of the sub-pixel of the WRGB screen.
The invention has the beneficial effects that: forming an R, G, B sub-pixel lighted RGB white field and a W white field only with a W sub-pixel lighted by inputting and controlling a test signal, and respectively detecting the color coordinate and the brightness value of the RGB white field and the color coordinate and the brightness value of the W white field; the difference value of the color coordinates of the RGB white field and the color coordinates of the W white field is compared with the threshold value of the preset color coordinate difference value, and the difference value of the brightness values of the RGB white field and the W white field is compared with the threshold value of the preset brightness difference value, so that whether the WRGB screen meets the performance requirement on the difference between the RGB white field and the W white field is judged, and later-stage image quality debugging and improvement of the subjective effect of the whole machine are facilitated.
Drawings
FIG. 1 is a flow chart of a method for detecting optical performance of a liquid crystal WRGB screen.
Detailed Description
The RGBW screen has 4 seed pixel points, including R, G, B, W. When the WRGB screen displays white fields, the WRGB screen is actually formed by combining two kinds of white fields: (1) r, G, B white field signals (RGB white field for short) formed by mixing the lighted sub-pixel points; (2) and white field signals (W white fields for short) generated by lighting the W sub-pixel points.
Television complete machine manufacturers usually only pay attention to whether RGBW white field signals meet requirements, and often ignore the difference between RGB white fields and W white fields. Research shows that when the color coordinate and brightness difference between the RGB white field and the W white field is large, the image quality debugging and the subjective effect of the whole machine at the later stage are seriously influenced, and the problems of large brightness loss of the whole machine, light color of the whole machine and the like are caused.
Therefore, the method for detecting the optical performance of the liquid crystal WRGB screen can detect the color coordinate difference and the brightness difference of the WRGB screen on the RGB white field and the W white field, and is favorable for improving the optical performance of the WRGB screen.
As shown in fig. 1, the method for detecting optical performance of a liquid crystal WRGB screen in the present invention includes the following steps:
a. inputting a test signal to a WRGB screen, and only lightening R, G, B sub-pixel points to form an RGB white field;
in a specific implementation, a test signal is input to the WRGB screen through a test tool, before the test signal is input, the luminance value of R, G, B sub-pixels in the test signal is set to be maximum (the maximum luminance value is set here to test the maximum luminance value of the RGB white field, and may also be set to other values, such as 80% of the maximum luminance value of R, G, B sub-pixels) through a software interface of the test tool, the luminance value of the W sub-pixel is set to be 0, and then the test tool outputs the test signal, and only R, G, B sub-pixels on the WRGB screen may be lit, thereby forming the RGB white field.
It should be noted that, a program for setting and controlling test signal output with a software interface needs to be loaded in the test tool, and the program is a control program that can be easily implemented by those skilled in the art according to the description of the solution of the present application, and details of specific implementation thereof are not described herein.
b. Testing and recording color coordinates and brightness values of the RGB white field;
in this step, the color coordinates (x) of the RGB white field need to be testedRGB,yRGB) And a luminance LRGB(ii) a The specific test method is the prior art and is not described herein again.
c. Inputting a test signal to a WRGB screen, and only lightening W sub pixel points to form a W white field;
in this step, we input a test signal to the WRGB screen through the test tool, before inputting the test signal, the software interface of the test tool may set the luminance value of R, G, B subpixel points in the test signal to 0, set the luminance value of W subpixel points to be maximum (here, the maximum luminance value is set to test the maximum luminance value of the W white field, and may also be set to other values, such as 80% of the maximum luminance of the W subpixel, and the like), and then the test tool outputs the test signal, and may only light the W subpixel points on the WRGB screen, thereby forming the W white field.
d. Testing and recording the color coordinate and the brightness value of the W white field;
in this step, the color coordinates (x) of the W white field need to be testedw,yw) And a luminance Lw；
e. Comparing the color coordinates of the RGB white field with the color coordinates of the W white field to obtain a color coordinate difference value;
in this step, the color coordinates (x) of the RGB white field are calculatedRGB,yRGB) And the color coordinates (x) of the W white fieldw,yw) Obtaining a color coordinate difference, wherein the difference of x color coordinates Δ x ═ xRGB-xw| y, y color coordinate difference Δ y ═ yRGB-yw|。
f. Comparing the brightness value of RGB white with the brightness value of W white field to obtain a brightness difference value;
in this step, the brightness value L of RGB white is calculatedRGBAnd W the luminance value L of the white fieldwObtaining a brightness difference
ΔL＝|LRGB-Lw|。
g. And judging whether the optical performance of the WRGB screen is qualified or not according to the color coordinate difference value and the brightness difference value.
In this step, the color coordinate difference values Δ x and Δ y are compared with a preset threshold value n of the color coordinate difference value, and the brightness difference value Δ L is compared with a preset threshold value m of the brightness difference value;
if the color coordinate difference values delta x and delta y are smaller than a preset threshold value n of the color coordinate difference value, and the brightness difference value delta L is smaller than a preset brightness difference value m, judging that the WRGB screen optical performance is qualified; otherwise, judging that the optical performance of the WRGB screen is unqualified.
That is, only when Δ x is less than n, Δ y is less than n, and Δ L is less than m, it is indicated that the WRGB screen has small color coordinate difference and luminance difference between the RGB white field and the W field, the screen optical performance is qualified, and the influence on the later-stage image quality debugging and the whole machine subjective effect is not large; otherwise, the optical performance of the screen is judged to be unqualified, and the screen manufacturer is required to correct and improve the optical materials and the like of the sub pixel points so as to finally meet the requirements.
Example (b):
taking a WRGB screen test of a certain company as an example, the white field color coordinates (0.284, 0.282) and the brightness 420nits of the WRGB screen are preliminarily tested, and after image quality debugging, the maximum brightness is reduced by 120nits, the brightness loss is 28.6 percent, the loss is very serious, the color is weak, and the subjective effect of the whole computer is very poor.
In order to verify the scheme of the invention, the method for detecting the optical performance of the liquid crystal WRGB screen is adopted for testing:
before testing, setting the target value of the difference between the color coordinates of the RGB white field and the color coordinates of the W white field to be 0.01 and the target value of the difference between the brightness of the RGB white field and the brightness of the W white field to be 10nits according to the testing requirement;
1) inputting a test signal by using a test tool, lighting W, R, G, B sub-pixel points to form a WRGB white field, and testing color coordinates 0.284 and 0.282 and brightness 420nits of the WRGB white field;
2) inputting a test signal by using a test tool, and only lighting R, G, B sub-pixel points to form an RGB white field, wherein the color coordinates of the test white field are 0.274, 0.287 and the brightness is 190 nits;
3) inputting a test signal by using a test tool, only lightening W sub pixel points to form a W white field, wherein the color coordinates of the test white field are 0.295, 0.284 and the brightness is 230nits, and the signal is seriously reddened and abnormal when being subjectively viewed;
4) comparing differences: Δ x ═ 0.021, Δ y ═ 0.003; Δ L ═ 40 nits. Where Δ x is greater than the target value of 0.01 and Δ L is greater than the target value of 10 nits. And judging that the optical performance of the screen is unqualified.
5) And (3) correcting and improving the optical materials and the like of the sub pixel points by a screen manufacturer, finally controlling the delta x and the delta y within 0.01 and the delta L within 10nits, and detecting the optical performance of the screen to be qualified. And after image quality parameters are debugged again, the brightness loss is within 10 percent, the color concentration is normal, and the subjective effect of the whole machine is normal.
Claims (5)
1. The method for detecting the optical performance of the liquid crystal WRGB screen is characterized by comprising the following steps:
a. inputting a test signal to a WRGB screen, and only lightening R, G, B sub-pixel points to form an RGB white field;
b. testing and recording color coordinates and brightness values of the RGB white field;
c. inputting a test signal to a WRGB screen, and only lightening W sub pixel points to form a W white field;
d. testing and recording the color coordinate and the brightness value of the W white field;
e. comparing the color coordinates of the RGB white field with the color coordinates of the W white field to obtain a color coordinate difference value;
f. comparing the brightness value of RGB white with the brightness value of W white field to obtain a brightness difference value;
g. and judging whether the optical performance of the WRGB screen is qualified or not according to the color coordinate difference value and the brightness difference value.
2. The method for detecting optical performance of a liquid crystal WRGB screen according to claim 1,
in the step a, a test signal is input to the WRGB screen through the test tool, before the test signal is input, the brightness value of R, G, B sub-pixel points in the test signal is set to be the maximum in the test tool, and the brightness value of W sub-pixel points is set to be 0.
3. The method for detecting optical performance of a liquid crystal WRGB screen according to claim 1,
in the step c, inputting a test signal to the WRGB screen through the test tool, and before inputting the test signal, setting the brightness value of the W sub-pixel point in the test signal to be maximum and setting the brightness value of the R, G, B sub-pixel point to be 0 in the test tool.
4. The method for detecting optical performance of a liquid crystal WRGB screen according to claim 1,
in the step g, the color coordinate difference value and the brightness difference value judge whether the optical performance of the WRGB screen is qualified, and specifically include:
comparing the color coordinate difference value with a preset threshold value of the color coordinate difference value, and comparing the brightness difference value with a preset threshold value of the brightness difference value;
if the color coordinate difference value is smaller than a preset threshold value of the color coordinate difference value and the brightness difference value is smaller than a preset brightness difference value, judging that the optical performance of the WRGB screen is qualified; otherwise, judging that the optical performance of the WRGB screen is unqualified.
5. The method for detecting optical performance of a liquid crystal WRGB screen according to claim 4,
in the step g, if the optical performance of the WRGB screen is judged to be unqualified, a screen manufacturer is required to correct and improve the optical material of the sub-pixel points of the WRGB screen.
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