CN108287419B - Display panel picture crosstalk testing method - Google Patents
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- CN108287419B CN108287419B CN201810096844.9A CN201810096844A CN108287419B CN 108287419 B CN108287419 B CN 108287419B CN 201810096844 A CN201810096844 A CN 201810096844A CN 108287419 B CN108287419 B CN 108287419B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
Abstract
The invention provides a method for testing the picture crosstalk of a display panel, which can test the picture crosstalk by displaying a picture which can be realized by the display panel at the Cell process stage, so that the picture crosstalk test is not required to be carried out after an IC (integrated circuit) and an FPC (flexible printed circuit) are bonded with the display panel at the module process stage, the test feedback time is shorter, the test efficiency can be improved, the waste of materials such as the IC and the FPC can be reduced, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method for testing picture crosstalk of a display panel.
Background
With the development of Display technology, flat panel Display devices such as Liquid Crystal Displays (LCDs) have advantages such as high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and become the mainstream of Display devices.
Most of the existing liquid crystal displays in the market are backlight liquid crystal displays (lcds), which include a liquid crystal display panel and a backlight module (backlight module). The liquid crystal display panel operates on the principle that liquid crystal molecules are filled between a Thin Film Transistor Array (TFT Array Substrate) and a Color Filter (CF) Substrate, and driving voltages are applied to the two substrates to control the rotation direction of the liquid crystal molecules, so that light of the backlight module is refracted out to generate a picture.
The Crosstalk (Crosstalk) phenomenon refers to the interference between different gray-scale pictures when the display panel displays two different gray-scale pictures at the same time. When both black and white screens are displayed simultaneously, the black area is insufficiently black due to the influence of the white area, and the white area is insufficiently white due to the influence of the black area, which affects the display quality. The reasons for Crosstalk can be generally classified into driving reasons, material reasons and process reasons. The driving reason and the material reason are relatively fixed, and the driving mode and the material are basically not changed after being selected. The process reason is difficult to control, and the product parameters of each batch may be inconsistent, so that cross is caused by the increase of TFT leakage current, parasitic capacitance and the like caused by the process reason.
As shown in fig. 1, for a conventional method for testing frame crosstalk of a display panel, a pure white frame is displayed on a display panel 100, a plurality of test points 101 in a non-middle area of the pure white frame are selected, first brightness values corresponding to the test points 101 are tested, a pure black frame is displayed in a middle area of the display panel 100, a pure white frame is continuously displayed in a peripheral area of the display panel 100 except the middle area, second brightness values corresponding to the test points 101 are tested again, a difference value between the first brightness value and the second brightness value of each test point 101 is calculated, and when the difference value between the first brightness value and the second brightness value of one or more test points 101 in the test points 101 is greater than a preset threshold value, it is determined that a frame crosstalk test of the display panel is not qualified. The existing display panel can not display the middle area of the display panel 100 as a pure black picture and the surrounding area as a pure white picture because no IC and FPC are bonded in the process stage of a TFT substrate and a CF substrate pair forming box (Cell), so that the picture crosstalk test needs to be carried out after an Integrated Circuit (IC), a Flexible Printed Circuit (FPC) and the display panel are bonded in the process stage of a module, the test feedback time is long, the problem solving efficiency is influenced, and when the picture crosstalk test of the display panel is unqualified, the IC and the FPC are bonded, the material waste of the IC and the FPC is caused, and the cost is not favorably saved.
Disclosure of Invention
The invention aims to provide a method for testing the picture crosstalk of a display panel, which can test the picture crosstalk in the Cell process stage of the display panel, not only can improve the testing efficiency, but also can reduce the waste of materials such as IC (integrated circuit), FPC (flexible printed circuit) and the like, and is favorable for saving the cost.
In order to achieve the above object, the present invention provides a method for testing crosstalk between pictures of a display panel, comprising the following steps:
step S1, providing a display panel, wherein the display panel displays a first gray scale picture between a pair-box process stage and a module process stage, the first gray scale picture has at least one test point, and the test points respectively correspond to first brightness values;
step S2, the display panel simultaneously displays a first gray scale picture and a second gray scale picture, and a second brightness value corresponding to each test point is tested;
step S3, respectively calculating the difference value between the first brightness value and the second brightness value corresponding to each test point, and when the difference value between the first brightness value and the second brightness value corresponding to at least one test point is greater than a preset threshold value, determining that the picture crosstalk test of the display panel is unqualified; and when the difference value between the first brightness value and the second brightness value corresponding to each test point is smaller than a preset threshold value, judging that the picture crosstalk test of the display panel is qualified.
The gray scale of the first gray scale picture is 255; the gray scale of the second gray scale picture is 0.
And testing a first brightness value and a second brightness value respectively corresponding to the plurality of test points by using a color analyzer or a spectral radiance brightness meter.
Optionally, in step S2, the display panel is divided into an upper area and a lower area, wherein the upper area displays the second grayscale image and the lower area displays the first grayscale image.
Optionally, in step S2, the display panel is divided into left and right areas, the left area displays the first grayscale image, and the right area displays the second grayscale image.
Optionally, in step S2, the display panel is divided into three sequentially connected upper, middle and lower regions, the upper region displays the first grayscale image, the middle region displays the second grayscale image, and the lower region displays the first grayscale image.
Optionally, in step S2, the display panel is divided into three sequentially connected upper, middle and lower regions, the upper region displays the second grayscale image, the middle region displays the first grayscale image, and the lower region displays the second grayscale image.
The test point is located in the central area of the first gray scale picture.
The invention has the beneficial effects that: according to the method for testing the picture crosstalk of the display panel, the picture which can be realized is displayed by the display panel in the Cell process stage to test the picture crosstalk, so that the picture crosstalk test is not required to be carried out after the IC and the FPC are bonded with the display panel in the module process stage, the test feedback time is short, the test efficiency can be improved, the waste of materials such as the IC and the FPC can be reduced, and the cost can be saved.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a diagram illustrating a conventional method for testing crosstalk between display panels;
FIG. 2 is a flowchart illustrating a method for testing crosstalk between frames of a display panel according to the present invention;
FIG. 3 is a diagram illustrating a crosstalk testing method for a display panel according to a first embodiment of the present invention;
FIG. 4 is a diagram illustrating a second embodiment of a method for testing crosstalk between frames of a display panel according to the present invention;
FIG. 5 is a diagram illustrating a third embodiment of a method for testing crosstalk between frames of a display panel according to the present invention;
FIG. 6 is a diagram illustrating a fourth embodiment of a method for testing crosstalk between frames of a display panel according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 2, the present invention provides a method for testing crosstalk between frames of a display panel, comprising the following steps:
step S1, providing a display panel 10, where the display panel 10 displays a first gray scale picture 11 between a Cell process stage and a module process stage, the first gray scale picture 11 has at least one test point 111, and each test point 111 is tested for a corresponding first brightness value;
step S2, the display panel 10 displays the first gray scale picture 11 and the second gray scale picture 12 at the same time, and tests the second brightness value corresponding to each test point 111;
step S3, calculating a difference between the first brightness value and the second brightness value corresponding to each test point 111, and when the difference between the first brightness value and the second brightness value corresponding to at least one test point 111 is greater than a preset threshold, determining that the picture crosstalk test of the display panel is not qualified; when the difference between the first brightness value and the second brightness value corresponding to each test point 111 is smaller than a preset threshold, the frame crosstalk test of the display panel is determined to be qualified.
Specifically, the gray scale of the first gray scale picture 11 is 255, i.e., a pure white picture, and the gray scale of the second gray scale picture 12 is 0, i.e., a pure black picture.
Specifically, a first brightness value and a second brightness value corresponding to the plurality of test points 111 are tested by a brightness test device; the brightness test device can be a color analyzer or a spectral radiance brightness meter; the color analyzer is preferably of the CA-310 type, and the spectral radiance meter is preferably of the CS-2000 type.
Specifically, referring to fig. 2 and fig. 3, which are first embodiments of the method for testing crosstalk between frames of a display panel according to the present invention, in step S1, the first gray-scale frame 11 has a test point 111, and a first luminance value corresponding to the test point 111 is tested;
in step S2, the display panel 10 is divided into two upper and lower regions, where the upper region displays the second grayscale picture 12 and the lower region displays the first grayscale picture 11; the test point 111 is located in the first gray scale picture 11 in the lower area of the display panel 10, and a second brightness value corresponding to the test point 111 is tested;
preferably, the test point 111 is located in the central area of the first gray scale frame 11 in the lower area of the display panel 10.
In step S3, calculating a difference between the first luminance value and the second luminance value corresponding to the test point 111, and when the difference between the first luminance value and the second luminance value corresponding to the test point 111 is greater than a preset threshold, determining that the frame crosstalk test of the display panel is not qualified; when the difference between the first brightness value and the second brightness value corresponding to the test point 111 is smaller than a preset threshold, the frame crosstalk test of the display panel is determined to be qualified.
Specifically, referring to fig. 2 and fig. 4, which are illustrations of a second embodiment of the method for testing crosstalk between frames of a display panel according to the present invention, in step S1, the first gray-scale frame 11 has a test point 111, and a first brightness value corresponding to the test point 111 is tested;
in step S2, the display panel 10 is divided into two left and right regions, where the left region displays the first grayscale image 11 and the right region displays the second grayscale image 12; the test point 111 is located in the first gray scale picture 11 in the left area of the display panel 10, and a second brightness value corresponding to the test point 111 is tested;
preferably, the test point 111 is located in the center region of the first grayscale frame 11 in the left region of the display panel 10.
In step S3, calculating a difference between the first luminance value and the second luminance value corresponding to the test point 111, and when the difference between the first luminance value and the second luminance value corresponding to the test point 111 is greater than a preset threshold, determining that the frame crosstalk test of the display panel is not qualified; when the difference between the first brightness value and the second brightness value corresponding to the test point 111 is smaller than a preset threshold, the frame crosstalk test of the display panel is determined to be qualified.
Specifically, referring to fig. 2 and fig. 5, which are illustrations of a third embodiment of the method for testing crosstalk between frames of a display panel according to the present invention, in step S1, the first gray-scale frame 11 has two test points 111, and the two test points 111 are tested for corresponding first luminance values respectively;
in step S2, the display panel 10 is divided into three sequentially connected upper, middle and lower regions, the upper region displays the first grayscale picture 11, the middle region displays the second grayscale picture 12, and the lower region displays the first grayscale picture 11; the two test points 111 are respectively located in the first gray scale picture 11 in the upper area and the lower area of the display panel 10, and the second brightness values corresponding to the two test points 111 are respectively tested;
preferably, the two test points 111 are respectively located in the central regions of the first grayscale frames 11 in the upper and lower regions of the display panel 10.
In step S3, calculating a difference between a first brightness value and a second brightness value corresponding to the two test points 111, respectively, and when the difference between the first brightness value and the second brightness value corresponding to at least one test point 111 is greater than a preset threshold, determining that the picture crosstalk test of the display panel is not qualified; when the difference between the first brightness value and the second brightness value corresponding to the two test points 111 is smaller than a preset threshold, the frame crosstalk test of the display panel is determined to be qualified.
Specifically, referring to fig. 2 and fig. 6, which are illustrations of a method for testing crosstalk between frames of a display panel according to a fourth embodiment of the present invention, in step S1, the first grayscale frame 11 has a test point 111, and a first luminance value corresponding to the test point 111 is tested;
in step S2, the display panel 10 is divided into three sequentially connected upper, middle and lower regions, the upper region displays the second grayscale picture 12, the middle region displays the first grayscale picture 11, and the lower region displays the second grayscale picture 12; the test point 111 is located in the first gray scale picture 11 in the middle area of the display panel 10, and a second brightness value corresponding to the test point 111 is tested;
preferably, the test point 111 is located in the central area of the first gray scale frame 11 in the middle area of the display panel 10.
In step S3, calculating a difference between the first luminance value and the second luminance value corresponding to the test point 111, and when the difference between the first luminance value and the second luminance value corresponding to the test point 111 is greater than a preset threshold, determining that the frame crosstalk test of the display panel is not qualified; when the difference between the first brightness value and the second brightness value corresponding to the test point 111 is smaller than a preset threshold, the frame crosstalk test of the display panel is determined to be qualified.
It should be noted that, in the method for testing the frame crosstalk of the display panel, the frame which can be realized is displayed by the display panel in the Cell process stage to test the frame crosstalk, so that the frame crosstalk test is not required to be carried out after the IC and the FPC are bonded with the display panel in the module process stage, the test feedback time is short, the test efficiency can be improved, the waste of materials such as the IC and the FPC can be reduced, and the cost can be saved.
In summary, the method for testing the frame crosstalk of the display panel according to the present invention tests the frame crosstalk by displaying a realizable frame on the display panel at the Cell process stage, so that the frame crosstalk test is not required to be performed after the IC and the FPC are bonded to the display panel at the module process stage, the test feedback time is short, the test efficiency can be improved, the waste of materials such as the IC and the FPC can be reduced, and the cost can be saved.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (8)
1. A method for testing the picture crosstalk of a display panel is characterized by comprising the following steps:
step S1, providing a display panel (10), wherein the display panel (10) displays a first gray scale picture (11) between a pair box manufacturing stage and a module manufacturing stage, the first gray scale picture (11) is provided with at least one test point (111), and a first brightness value corresponding to each test point (111) is tested;
step S2, the display panel (10) displays a first gray scale picture (11) and a second gray scale picture (12) at the same time, and a second brightness value corresponding to each test point (111) is tested;
step S3, respectively calculating the difference value between the first brightness value and the second brightness value corresponding to each test point (111), and when the difference value between the first brightness value and the second brightness value corresponding to at least one test point (111) is greater than a preset threshold value, judging that the picture crosstalk test of the display panel is unqualified; when the difference value between the first brightness value and the second brightness value corresponding to each test point (111) is smaller than a preset threshold value, judging that the picture crosstalk test of the display panel is qualified;
the gray scale of the first gray scale picture (11) is 255; the gray scale of the second gray scale picture (12) is 0;
testing a first brightness value and a second brightness value which respectively correspond to the plurality of test points (111) through a color analyzer or a spectral radiance brightness meter;
in step S2, the display panel (10) is divided into two upper and lower regions, the upper region displaying the second grayscale screen (12) and the lower region displaying the first grayscale screen (11).
2. The method for testing crosstalk between frames of a display panel according to claim 1, wherein said test point (111) is located in a central region of said first gray-scale frame (11).
3. A method for testing the picture crosstalk of a display panel is characterized by comprising the following steps:
step S1, providing a display panel (10), wherein the display panel (10) displays a first gray scale picture (11) between a pair box manufacturing stage and a module manufacturing stage, the first gray scale picture (11) is provided with at least one test point (111), and a first brightness value corresponding to each test point (111) is tested;
step S2, the display panel (10) displays a first gray scale picture (11) and a second gray scale picture (12) at the same time, and a second brightness value corresponding to each test point (111) is tested;
step S3, respectively calculating the difference value between the first brightness value and the second brightness value corresponding to each test point (111), and when the difference value between the first brightness value and the second brightness value corresponding to at least one test point (111) is greater than a preset threshold value, judging that the picture crosstalk test of the display panel is unqualified; when the difference value between the first brightness value and the second brightness value corresponding to each test point (111) is smaller than a preset threshold value, judging that the picture crosstalk test of the display panel is qualified;
the gray scale of the first gray scale picture (11) is 255; the gray scale of the second gray scale picture (12) is 0;
testing a first brightness value and a second brightness value which respectively correspond to the plurality of test points (111) through a color analyzer or a spectral radiance brightness meter;
in step S2, the display panel (10) is divided into left and right regions, the left region displaying a first grayscale screen (11) and the right region displaying a second grayscale screen (12).
4. The method for testing crosstalk of a display panel picture according to claim 3, wherein the test point (111) is located in a central region of the first gray-scale picture (11).
5. A method for testing the picture crosstalk of a display panel is characterized by comprising the following steps:
step S1, providing a display panel (10), wherein the display panel (10) displays a first gray scale picture (11) between a pair box manufacturing stage and a module manufacturing stage, the first gray scale picture (11) is provided with at least one test point (111), and a first brightness value corresponding to each test point (111) is tested;
step S2, the display panel (10) displays a first gray scale picture (11) and a second gray scale picture (12) at the same time, and a second brightness value corresponding to each test point (111) is tested;
step S3, respectively calculating the difference value between the first brightness value and the second brightness value corresponding to each test point (111), and when the difference value between the first brightness value and the second brightness value corresponding to at least one test point (111) is greater than a preset threshold value, judging that the picture crosstalk test of the display panel is unqualified; when the difference value between the first brightness value and the second brightness value corresponding to each test point (111) is smaller than a preset threshold value, judging that the picture crosstalk test of the display panel is qualified;
the gray scale of the first gray scale picture (11) is 255; the gray scale of the second gray scale picture (12) is 0;
testing a first brightness value and a second brightness value which respectively correspond to the plurality of test points (111) through a color analyzer or a spectral radiance brightness meter;
in step S2, the display panel (10) is divided into three sequentially connected upper, middle and lower regions, the upper region displays a first gray scale screen (11), the middle region displays a second gray scale screen (12), and the lower region displays the first gray scale screen (11).
6. The method for testing crosstalk of a display panel picture according to claim 5, wherein the test point (111) is located in a central region of the first gray-scale picture (11).
7. A method for testing the picture crosstalk of a display panel is characterized by comprising the following steps:
step S1, providing a display panel (10), wherein the display panel (10) displays a first gray scale picture (11) between a pair box manufacturing stage and a module manufacturing stage, the first gray scale picture (11) is provided with at least one test point (111), and a first brightness value corresponding to each test point (111) is tested;
step S2, the display panel (10) displays a first gray scale picture (11) and a second gray scale picture (12) at the same time, and a second brightness value corresponding to each test point (111) is tested;
step S3, respectively calculating the difference value between the first brightness value and the second brightness value corresponding to each test point (111), and when the difference value between the first brightness value and the second brightness value corresponding to at least one test point (111) is greater than a preset threshold value, judging that the picture crosstalk test of the display panel is unqualified; when the difference value between the first brightness value and the second brightness value corresponding to each test point (111) is smaller than a preset threshold value, judging that the picture crosstalk test of the display panel is qualified;
the gray scale of the first gray scale picture (11) is 255; the gray scale of the second gray scale picture (12) is 0;
testing a first brightness value and a second brightness value which respectively correspond to the plurality of test points (111) through a color analyzer or a spectral radiance brightness meter;
in step S2, the display panel (10) is divided into three areas, i.e., an upper area, a middle area and a lower area, which are sequentially connected, wherein the upper area displays a second gray scale picture (12), the middle area displays a first gray scale picture (11), and the lower area displays the second gray scale picture (12).
8. The method for testing crosstalk between frames of a display panel according to claim 7, wherein said test point (111) is located in a central region of said first gray-scale frame (11).
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| CN106569353A (en) * | 2015-10-12 | 2017-04-19 | 比亚迪股份有限公司 | Method and device for measuring display crosstalk of liquid crystal display |
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| CN1881060A (en) * | 2005-06-15 | 2006-12-20 | Lg.菲利浦Lcd株式会社 | Liquid crystal display device and testing method thereof |
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| CN103414912A (en) * | 2013-07-31 | 2013-11-27 | 京东方科技集团股份有限公司 | Method and device for naked eye three-dimensional display crosstalk evaluation |
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