Crosstalk detection method for liquid crystal display module

Abstract

The invention discloses a liquid crystal display module Crosstalk detection method, which comprises the following steps of: dividing a liquid crystal display module into a plurality of cells arranged in an array, enabling the liquid crystal display module to display a first picture, and recording a brightness value of a detection point of each cell as a reference value; and respectively displaying the second picture, the third picture, the fourth picture and the fifth picture, and comparing the detected brightness with a reference value. According to the invention, more accurate crosstalk detection can be realized, defective liquid crystal display modules are prevented from flowing into the downstream, and the yield of products is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display modules, and in particular to a liquid crystal display module Crosstalk detection method. Background Art

[0002] The existing crosstalk detection method for LCD modules is as follows: first, the LCD module displays a gray screen, and then the brightness of positions #1, #2, #3, #4, #6, #7, #8, and #9 are detected respectively under the gray screen as the reference value of the brightness of the position. The distribution of the detection points #1 to #9 is as follows: Figure 1 As shown, the liquid crystal display module is then made to display as shown Figure 2 The picture shown is gray around and white in the middle, Figure 3 The image shown is gray on all sides and black in the middle. The brightness of positions #1 to #9 is tested, and the resulting brightness is compared with the brightness reference values ​​for positions #1 to #9 corresponding to the gray image. If the difference between the brightness of each test point and the reference value is within 2%, the test passes. If the difference between the brightness of the new image and the reference value at any test point is greater than 2%, the test fails. The existing detection methods have the following drawbacks: 1. The test points are spaced far apart, and the resulting crosstalk test results only reflect the crosstalk between Source signal lines at the gray-white or gray-black boundary, and cannot determine the crosstalk between other Source lines. 2. Under different liquid crystal deflection voltages, the power consumption of the Source lines varies, and the interference generated also varies. Therefore, the existing detection screen does not have cross-color changes, making it impossible to determine whether the existing gray screen has crosstalk issues.

[0003] Therefore, the existing technology has defects and needs to be improved. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for detecting crosstalk in a liquid crystal display module.

[0005] The technical solution of the present invention is as follows: The present invention provides a liquid crystal display module Crosstalk detection method, comprising the following steps:

[0006] Step 1: Divide the liquid crystal display module into a plurality of cells arranged in an array, display a first image on the liquid crystal display module, and record the brightness value of a detection point of each cell as a reference value;

[0007] Step 2: The LCD module displays the second image and records the brightness value of the detection point of each cell, and compares it with the reference value of the detection point of the corresponding cell in step 1. If the brightness value of the detection point of any cell differs from the reference value by more than a predetermined value, the test is determined to be unqualified and the test is stopped. Otherwise, the process proceeds to step 3.

[0008] Step 3: The LCD module displays the third image and records the brightness value of the detection point of each cell. The brightness value is compared with the reference value of the detection point of the corresponding cell in step 1. If the brightness value of the detection point of any cell differs from the reference value by more than a predetermined value, the test is determined to be unqualified and the test is stopped. Otherwise, the process proceeds to step 4.

[0009] Step 4: The LCD module displays the fourth image and records the brightness value of the detection point of each cell. The brightness value is compared with the reference value of the detection point of the corresponding cell in step 1. If the brightness value of the detection point of any cell differs from the reference value by more than a predetermined value, the test is determined to be unqualified and the test is stopped. Otherwise, the process proceeds to step 5.

[0010] Step 5: The LCD module displays the fifth image and records the brightness value of the detection point of each cell. The brightness value is compared with the reference value of the detection point of the corresponding cell in step 1. If the brightness value of the detection point of any cell differs from the reference value by more than a predetermined value, the test is determined to be unqualified. Otherwise, the test is determined to be qualified.

[0011] The first screen is a fully gray screen, the second screen, the third screen, the fourth screen, and the fifth screen are different from each other, and the second screen, the third screen, the fourth screen, and the fifth screen are all one of the following screens: the display color of the cells in each column is gray or white, the colors of the cells in adjacent columns are different, and the color of the cells in the first column is gray; the display color of the cells in each column is gray or white, the colors of the cells in adjacent columns are different, and the color of the cells in the first column is white; the display color of the cells in each column is black or gray, the colors of the cells in adjacent columns are different, and the color of the cells in the first column is gray; the display color of the cells in each column is black or gray, the colors of the cells in adjacent columns are different, and the color of the cells in the first column is black.

[0012] Furthermore, the predetermined value is 2%.

[0013] Furthermore, after determining that the test is unqualified or qualified, the test result is output.

[0014] By adopting the above solution, the beneficial effect of the present invention is that it can achieve more accurate crosstalk detection, prevent problematic liquid crystal display modules from flowing downstream, and improve product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a gray screen image showing the locations of detection points in the detection method of the prior art.

[0016] Figure 2In the detection method of the prior art, a gray image with a white center is used to mark the detection point position.

[0017] Figure 3 This is a picture with gray surroundings and white in the middle, showing the detection point position in the detection method in the prior art.

[0018] Figure 4 Schematic diagram of the distribution of cells and detection points of a liquid crystal display module in a detection method according to an embodiment of the present application.

[0019] Figure 5 This is a first image displayed by the liquid crystal display module in the detection method according to an embodiment of the present application.

[0020] Figure 6 This is a second image displayed by the liquid crystal display module in the detection method according to an embodiment of the present application.

[0021] Figure 7 This is a third image displayed by the liquid crystal display module in the detection method according to an embodiment of the present application.

[0022] Figure 8 This is a fourth image displayed by the liquid crystal display module in the detection method according to an embodiment of the present application.

[0023] Figure 9 This is a fifth image displayed by the liquid crystal display module in the detection method according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Please refer to Figures 4 to 9 In this embodiment, the present invention provides a method for detecting Crosstalk in a liquid crystal display module, comprising the following steps:

[0026] Step 1: Divide the liquid crystal display module into a number of cells arranged in an array, and make the liquid crystal display module display the first picture. The first picture is a gray picture (RGB values ​​are all 128), and the brightness value of the detection point of each cell is recorded as a reference value. Specifically, in the present embodiment, 10 columns and 10 rows are divided into 100 cells, so there are 100 detection points. The cells from left to right are respectively A column, B column, C column, D column, E column, F column, G column, H column, I column, and J column. The cells from top to bottom are respectively row 1, row 2, row 3, row 4, row 5, row 6, row 7, row 8, row 9, and row 10.

[0027] Step 2: The LCD module displays the second image and records the brightness value of the detection point of each cell and compares it with the reference value of the detection point of the corresponding cell in step 1. If the brightness value of the detection point of a cell differs from the reference value by more than 2%, the test is judged to be unqualified and the test is stopped. Otherwise, the test goes to step 3. For example, the reference value of the brightness of the detection point in the cell of column B row 3 in the first image is y1, and the brightness value measured in the second image is y2. If

[0028] If |y2-y1|≤0.02y1, it means that the brightness test of the detection point of this cell has passed. In this embodiment, the second screen is as follows: the display color of cells in each column is gray or white, the colors of cells in adjacent columns are different, and the color of cells in the first column (i.e., column A) is gray.

[0029] Step 3: The LCD module displays the third image and records the brightness value of each cell's detection point. The brightness value is compared with the reference value of the corresponding cell's detection point from Step 1. If the brightness value of any cell's detection point differs from the reference value by more than 2%, the test is deemed unqualified and the test is terminated. Otherwise, the process proceeds to Step 4. In this embodiment, the third image is displayed as follows: cells in each column are displayed in gray or white. Cells in adjacent columns have different colors, and the cells in the first column are displayed in gray.

[0030] Step 4: The LCD module displays the fourth image and records the brightness value of each cell's detection point. The brightness value is compared with the reference value of the corresponding cell's detection point from Step 1. If the brightness value of any cell's detection point differs from the reference value by more than 2%, the test is deemed unqualified and the test is terminated. Otherwise, the process proceeds to Step 5. In this embodiment, the fourth image is displayed as follows: each column of cells is displayed in black or gray. The colors of cells in adjacent columns are different, and the color of cells in the first column is gray.

[0031] Step 5: The LCD module displays the fifth image and records the brightness value of each cell's detection point. This value is then compared with the reference value of the corresponding cell's detection point from Step 1. If the brightness value of any cell's detection point differs from the reference value by more than a predetermined value, the test is deemed unqualified. Otherwise, the test is deemed qualified by 2%. In this embodiment, the fifth image displays cells in each column in black or gray. Cells in adjacent columns have different colors, and the cells in the first column are all black.

[0032] In this solution, the screen is subdivided into cells, and the colors displayed in each column of cells are different. The brightness is detected under gray and white or black and white images and compared with the brightness baseline value of the full gray image. This new detection method combines the display mechanism of the display module for detection, which can more accurately detect crosstalk problems, avoid the inaccurate detection problems of existing technologies, and greatly improve detection accuracy.

[0033] In summary, this solution can achieve more accurate crosstalk detection, prevent problematic LCD modules from flowing downstream, and improve product yield.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A liquid crystal display module Crosstalk detection method, characterized in that: The following steps are involved: Step 1: Divide the liquid crystal display module into a plurality of cells arranged in an array, display a first image on the liquid crystal display module, and record the brightness value of a detection point of each cell as a reference value; Step 2: The LCD module displays the second image and records the brightness value of the detection point of each cell, and compares it with the reference value of the detection point of the corresponding cell in step 1. If the brightness value of the detection point of any cell differs from the reference value by more than a predetermined value, the test is determined to be unqualified and the test is stopped. Otherwise, the process proceeds to step 3. Step 3: The LCD module displays the third image and records the brightness value of the detection point of each cell. The brightness value is compared with the reference value of the detection point of the corresponding cell in step 1. If the brightness value of the detection point of any cell differs from the reference value by more than a predetermined value, the test is determined to be unqualified and the test is stopped. Otherwise, the process proceeds to step 4. Step 4: The LCD module displays the fourth image and records the brightness value of the detection point of each cell. The brightness value is compared with the reference value of the detection point of the corresponding cell in step 1. If the brightness value of the detection point of any cell differs from the reference value by more than a predetermined value, the test is determined to be unqualified and the test is stopped. Otherwise, the process proceeds to step 5. Step 5: The LCD module displays the fifth image and records the brightness value of the detection point of each cell. The brightness value is compared with the reference value of the detection point of the corresponding cell in step 1. If the brightness value of the detection point of any cell differs from the reference value by more than a predetermined value, the test is determined to be unqualified. Otherwise, the test is determined to be qualified. The first screen is a fully gray screen, the second screen, the third screen, the fourth screen, and the fifth screen are different from each other, and the second screen, the third screen, the fourth screen, and the fifth screen are all one of the following screens: the display color of the cells in each column is gray or white, the colors of the cells in adjacent columns are different, and the color of the cells in the first column is gray; the display color of the cells in each column is gray or white, the colors of the cells in adjacent columns are different, and the color of the cells in the first column is white; the display color of the cells in each column is black or gray, the colors of the cells in adjacent columns are different, and the color of the cells in the first column is gray; the display color of the cells in each column is black or gray, the colors of the cells in adjacent columns are different, and the color of the cells in the first column is black.

2. The liquid crystal display module Crosstalk detection method according to claim 1, characterized in that: The predetermined value is 2%.

3. The liquid crystal display module Crosstalk detection method according to claim 1 or 2, characterized in that: After determining that the test is unqualified or qualified, the test result is output.

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