Optical Testing Method for Display Screen Module

Abstract

The present invention discloses an optical testing method for a display screen module, comprising: fixing the display screen module to be tested in a test fixture, and at the same time placing the test probe of a color analyzer on the test area of the display screen module to be tested; supplying power to the display screen module to be tested, and controlling the entire screen of the display screen module to be tested to display a transition screen; controlling the test area of the display screen module to be tested to switch to a test screen, and controlling the non-test area outside the test area of the display screen module to be tested to display a background screen, wherein the background screen is different from the screen displayed by the test screen; collecting data through the test probe to complete the optical testing of the display screen module to be tested. In the present invention, the amount of data change becomes smaller, the speed of switching the screen becomes faster, and the speed of optical testing will also be accelerated, thus accelerating the production speed.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an optical testing method for a display screen module. Background Art

[0002] During the production process of display modules, both appearance inspection and functional inspection are crucial steps. Functional inspection involves testing the optical parameters of display modules using a color analyzer. This helps identify which display modules fail optical parameters and which meet optical standards and are therefore suitable for shipment.

[0003] During optical testing, the display module must be illuminated using a production jig, and the screen to be tested must be switched using a color analyzer. However, the increasing resolution of existing display modules has resulted in a decrease in screen switching speed without upgrading the production jig. Constantly upgrading the production jig would increase the production cost of the display module. Furthermore, the increasing requirements for optical testing require a large number of test screens to switch between, which slows down the optical testing process for the display module, reducing production efficiency and increasing production costs. Summary of the Invention

[0004] The invention discloses an optical testing method for a display screen module, which is used to solve the problem in the prior art that the speed of the display screen module in the optical testing link is relatively slow.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] Provided is an optical testing method for a display screen module, comprising:

[0007] Fixing the display screen module to be tested in a test fixture, and placing the test probe of the color analyzer in a test area of the display screen module to be tested, wherein the test area is a pre-set area that is only a portion of the screen of the display screen module to be tested;

[0008] Provide power to the display module to be tested and control the entire screen of the display module to be tested to display the transition picture;

[0009] Controlling the test area of the display screen module to be tested to switch to a test screen, and controlling the non-test area outside the test area of the display screen module to be tested to display a background screen, wherein the background screen is different from the screen displayed by the test screen;

[0010] The test probe collects data to complete the optical test of the display module to be tested.

[0011] Optionally, the test area of the display screen module to be tested is located in the central area of the display screen module to be tested.

[0012] Optionally, the test area of the display screen module to be tested is rectangular.

[0013] Optionally, both the length and width of the test area of the display screen module to be tested are more than 2 times the diameter of the test probe.

[0014] Optionally, if the optical test includes at least two different optical parameter tests, then control the test area of the display screen module to be tested to switch to a test screen, and control the area outside the test area of the display screen module to be tested to form a background screen, specifically including the steps of:

[0015] Control the test area of the display screen module to be tested to sequentially switch to the test screens required for each test;

[0016] Control the background screen of the area outside the test area of the display screen module to be tested to remain unchanged.

[0017] Optionally, the optical parameters include at least one of chromaticity, brightness, and gamma optical parameters.

[0018] Optionally, the background screen is the same as the transition screen.

[0019] Optionally, the transition screen is a screen in which each pixel of the screen displays a color other than white.

[0020] Optionally, the transition screen is a gray screen or a gray-scale transition screen.

[0021] Optionally, control the test area of the display screen module to be tested to switch to a test screen, and control the non-test area outside the test area of the display screen module to be tested to display a background screen, specifically including the steps of:

[0022] The color analyzer transmits an information data stream of the number, position, and specific color of the pixel points to be changed according to the optical parameters to the driving IC of the display screen module to be tested;

[0023] The driving IC controls the test area of the display screen module to be tested to switch to a test screen according to the information data stream, and controls the non-test area outside the test area of the display screen module to be tested to display a background screen.

[0024] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0025] Because the test screen is smaller, switching only requires a small area in the center. This means the display module under test only needs to update data in the center area to display a specific screen. Compared to switching the entire display screen, the amount of data changed is smaller, the switching speed is faster, and the optical test speed is also accelerated, which speeds up production.

[0026] The switched screen is the middle area of the display screen, which is helpful for observing whether the display of the middle area will affect the display of other areas of the background, that is, it is helpful for observing whether there is a cross effect phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0028] Figure 1 A schematic flow chart of an optical testing method for a display screen module disclosed in an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of a test area of a display screen module disclosed in an embodiment of the present invention.

[0030] Among them, Figure 1-2 The following reference numerals are included:

[0031] Test area-1; non-test area-2; transition screen-3. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] The optical testing method of the display screen module of the present invention is as follows: Figure 1 As shown, the specific steps include:

[0034] Step S10: fix the display module to be tested in a test fixture, and place the test probe of the color analyzer in the test area 1 of the display module to be tested;

[0035] Step S20, supplying power to the display screen module to be tested, and controlling the entire screen of the display screen module to be tested to display transition picture 3;

[0036] Step S30: Control the test area 1 of the display module under test to switch to a test screen, and control the non-test area 2 outside the test area 1 of the display module under test to display a background screen;

[0037] Step S40: Collect data through a test probe to complete the optical test of the display module under test.

[0038] Among them, in step S10, the structures of the test fixture and the color analyzer are the same as usual. The model of the color analyzer can specifically be, for example, CA310. The test probes of the color analyzer are mostly circular. The CA310 color analyzer

[0039] The test area 1 is preset and is only a part of the screen of the display module under test. In one example, as Figure 2 shown, the test area 1 is located in the central area of the display module under test, and the test area 1 is surrounded by the non-test area 2.

[0040] Furthermore, the area and shape of the test area 1 can be specifically set according to requirements. In one example, the shape of the test area 1 is rectangular. The length and width of the test area 1 are both more than 2 times the diameter of the test probe. Further preferably, the length and width of the test area 1 are equal and are approximately 2 - 3 times the diameter of the test probe. The probe diameter of the CA310 color analyzer is usually 1 cm, so the length and width of the test area 1 are approximately 2 - 3 cm.

[0041] In step S20, the transition screen 3 can be a screen where each pixel of the screen displays a color other than white. Preferably, the transition screen 3 is a gray screen or a gray-scale transition screen 3. Such a setting effectively meets the user's needs and improves the user experience; moreover, it is convenient to observe whether a cross effect occurs subsequently.

[0042] It should be noted that the gray screen is a single gray-scale value screen. The gray-scale transition screen 3 is a screen with changing gray-scale values. Among them, along the outer periphery to the center of the screen, the gray-scale value of the gray-scale transition screen 3 can gradually increase or gradually decrease, which can be specifically set according to requirements. The specific gray-scale values of the gray screen and the gray-scale transition screen 3 can be specifically set according to requirements.

[0043] In step S30, it specifically includes steps; the color analyzer transmits an information data stream of the number, position, and specific color of the pixel points that need to be changed to the driving IC of the display module under test according to the optical parameters; the driving IC controls the test area 1 of the display module under test to switch to a test screen according to the information data stream, and controls the non-test area 2 outside the test area 1 of the display module under test to display a background screen.

[0044] Among them, the test screen can be specifically set according to the specific optical parameters being tested. For example, as Figure 2As shown, when the optical parameter to be tested is the brightness optical parameter, the test screen is pure white. When the optical parameter to be tested is the gamma optical parameter, the test screen is a set of screens from black to light black and then to white, that is, 256 screens with RGB chromaticity ranging from 0x000000 to 0xFFFFFF. When observed by the human eye, the screen switches from the black screen, slowly changes to light black, then to gray, and finally slowly fades to white, with a total of 256 screens.

[0045] The background screen can be the same as the transition screen 3. When the transition screen 3 is a gray screen, the background screen is also a gray screen; when the transition screen 3 is a gray-scale transition screen 3, the background screen is also a gray-scale transition screen 3.

[0046] Furthermore, when there are multiple optical parameters to be tested, the background screen used each time is the same and is the transition screen 3. That is, during the optical test, only the test screen is switched, and the background screen remains unchanged.

[0047] In step S40, the optical parameter can be at least one of chromaticity, brightness, and gamma optical parameter. Corresponding to different optical parameters, their calculation methods are also different. For example, the operation method of brightness is to compare the measured brightness value with the brightness threshold set by the customer. If the measured brightness value exceeds the brightness threshold, the brightness meets the user's requirements; otherwise, it is a defective product in terms of brightness. As shown in Table 1.

[0048]

[0049] Table 1

[0050] The operation method of chromaticity is to compare the measured X value and Y value with the chromaticity threshold set by the customer. If the measured X value and Y value exceed the chromaticity threshold, the chromaticity meets the user's requirements; otherwise, it is a defective product in terms of chromaticity. As shown in Table 2.

[0051]

[0052] Table 2

[0053] The operation method of gamma is to perform a certain formula operation on the 256 measured brightness values, and then draw a curve graph based on the operation value to observe whether the curve is smooth and whether the change rate of the curve meets the expectation. Reflected in the human eye, it is whether the change of the display screen is uniform during the process of the display screen changing from black to white step by step, and whether each gradient is uniform. As shown in Table 3.

[0054]

[0055]

[0056] Table 3

[0057] When optically testing a display screen module using the present invention's optical testing method, the test screen is reduced in size, and switching the screen only requires switching a small portion of the center area. This means that the display screen module under test only needs to update the data in the center area to display a specific screen. Compared to conventional methods of switching the entire display screen, the amount of data change is reduced, the screen switching speed is increased, and the optical test speed is also accelerated, speeding up production. The screen switched is located in the center area of the display, which facilitates observation of whether the display in the center area affects the display in other background areas, that is, it facilitates observation of any cross-effect phenomenon.

[0058] The cross effect refers to whether the display of one pixel on a display module affects the display of other pixels during the display process. For example, if the background image is gray and the center test area 1 is white, a good display screen will display gray as gray and white as white. However, a display screen module with a cross effect may affect the gray of the background image by the white in test area 1. For example, the gray surrounding the white pixel may be significantly whiter than the gray elsewhere. In this case, the display of the white pixel in test area 1 affects the display of other gray pixels.

[0059] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. An optical testing method for a display screen module, characterized in that: It includes: Fix the display screen module to be tested in a test fixture, and at the same time place the test probe of the color analyzer on the test area of the display screen module to be tested, where the test area is a pre-set area that is only a part of the screen of the display screen module to be tested; Power on the display screen module to be tested and control the entire screen of the display screen module to be tested to display a transition screen; Control the test area of the display screen module to be tested to switch to a test screen, and control the non-test area outside the test area of the display screen module to be tested to display a background screen. Specifically, it includes: The color analyzer transmits an information data stream of the number, position, and specific color of the pixel points that need to be changed to the driving IC of the display screen module to be tested according to the optical parameters; The driving IC controls the test area of the display screen module to be tested to switch to a test screen according to the information data stream, and controls the non-test area outside the test area of the display screen module to be tested to display a background screen; where the background screen is different from the screen displayed by the test screen; Collect data through the test probe to complete the optical test of the display screen module to be tested; If the optical test includes at least two different optical parameter tests, then control the test area of the display screen module to be tested to switch to a test screen, and control the area outside the test area of the display screen module to be tested to form a background screen. Specifically, it includes the steps of: Control the test area of the display screen module to be tested to sequentially switch to each test screen required for the test; Control the background screen of the area outside the test area of the display screen module to be tested to remain unchanged.

2. The optical testing method for a display screen module according to claim 1, characterized in that: The test area of the display screen module to be tested is located in the central area of the display screen module to be tested.

3. The optical testing method for a display screen module according to claim 1, characterized in that: The test area of the display screen module to be tested is rectangular.

4. The optical testing method for a display screen module according to claim 3, characterized in that: Both the length and width of the test area of the display screen module to be tested are more than 2 times the diameter of the test probe.

5. The optical testing method for a display screen module according to claim 1, characterized in that: The optical parameters include at least one of chromaticity, brightness, and gamma optical parameters.

6. The optical testing method for a display screen module according to claim 1, characterized in that: The background screen is the same as the transition screen.

7. The optical testing method for a display screen module according to claim 6, characterized in that: The transition screen is a screen in which each pixel of the screen displays a color other than white.

8. The optical testing method for a display screen module according to claim 6, characterized in that: The transition screen is a gray screen or a gray-scale transition screen.

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