A grating type naked eye 3D display screen fitting precision test method and device thereof

Abstract

The present application relates to the technical field of display screen detection, in particular to a grating type naked eye 3D display screen fitting precision test method and device thereof, the method comprises the following steps: sequentially lighting the first picture, the second picture and the third picture of the display screen to be tested, the collection camera of the camera collection module automatically samples, and the first brightness value L1, the second brightness value L2 and the third brightness value L3 of the collected picture are analyzed respectively; the contrast CR is calculated by the formula CR=(L1-L3) / (L2-L3); the contrast CR obtained by analysis and calculation is compared with the standard value of contrast, and the result is judged as OK when the contrast CR is greater than or equal to the standard value, and the result is judged as NG when the contrast CR is less than the standard value; the device is used to realize the method. The present application replaces the human eye detection with the visual system, uses the corresponding relationship between the fitting alignment deviation and the 3D display contrast, replaces the size measurement method with the contrast measurement method to evaluate the fitting precision, and significantly improves the test efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display screen detection, in particular to a grating type naked eye 3D display screen fitting precision testing method and device. BACKGROUND

[0002] Naked eye 3D has a realistic stereoscopic picture effect, can create a shocking visual impact, and brings people a novel media visual experience, is a revolutionary breakthrough in the display field, is one of the mainstream directions of the development of the display field, and is a hot spot of the display field research.

[0003] In the production process of the grating type naked eye 3D display screen, there is always a certain deviation in the fitting position of the grating and the TFT display screen, and the position deviation will affect the 3D display effect. Therefore, the detection and control of the fitting precision are particularly important. If the traditional method is used to measure the fitting size deviation (x direction deviation, y direction deviation and angle deviation) under a microscope, the efficiency is extremely low, and it is difficult to define the OK / NG standard. It is not suitable for quality control in mass production. SUMMARY

[0004] In order to solve the problems mentioned in the background, the purpose of the present application is to provide a grating type naked eye 3D display screen fitting precision testing method and device, which solves the problem of extremely low efficiency of grating type naked eye 3D display screen fitting precision testing in the prior art.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A grating type naked eye 3D display screen fitting precision testing method, the method comprising the following steps:

[0007] Step one: light up the first picture of the display screen to be tested, the sampling camera of the camera acquisition module automatically samples, and analyzes the first brightness value L1 of the acquisition picture (i.e. the picture collected by the camera);

[0008] Step two: light up the second picture of the display screen to be tested, and analyze the second brightness value L2 of the acquisition picture;

[0009] Step three: light up the third picture of the display screen to be tested, and analyze the third brightness value L3 of the acquisition picture;

[0010] Step four: calculate the contrast CR using the formula CR=(L1-L3) / (L2-L3);

[0011] Step five: compare the calculated contrast CR with the standard value of contrast, if the contrast CR is greater than or equal to the standard value, the result is OK, and if the contrast CR is less than the standard value, the result is NG;

[0012] When the collection camera is located at the left eye position, the first picture of the display screen is a white-black picture (white vertical stripes and black vertical stripes are alternated), the second picture of the display screen is a black-white picture (black vertical stripes and white vertical stripes are alternated), and the third picture of the display screen is a full black picture.

[0013] When the collection camera is located at the right eye position, the first picture of the display screen is a black-white picture (black vertical stripes and white vertical stripes are alternated), the second picture of the display screen is a white-black picture (white vertical stripes and black vertical stripes are alternated), and the third picture of the display screen is a full black picture.

[0014] The order of the first step, the second step and the third step is not in sequence, because the lighting order of the three pictures does not affect the analysis result of the brightness value, and the order of obtaining the first brightness value L1, the second brightness value L2 and the third brightness value L3 can be adjusted arbitrarily.

[0015] Further, the camera collection module includes a left camera and a right camera simulating the structure of human eyes, the left camera and the right camera are used to test the display screen to be tested and calculate the contrast CR, and only when the contrast measured by the left camera and the contrast measured by the right camera are both greater than or equal to a standard value, the 3D display screen is determined to be qualified. It is easy to understand that the left camera and the right camera can collect at the same time after any picture of the display screen to be tested is lighted, but when the lighted picture is a white-black picture, the brightness value analyzed by the left camera after sampling is the first brightness value L1, and the brightness value analyzed by the right camera after sampling is the second brightness value L2; similarly, when the lighted picture is a black-white picture, the brightness value analyzed by the left camera after sampling is the second brightness value L2, and the brightness value analyzed by the right camera after sampling is the first brightness value L1; when the lighted picture is a full black picture, the brightness value analyzed by the left camera and the right camera after sampling is the third brightness value L3.

[0016] Further, the standard value of the contrast is a 3D display screen with a fitting size deviation as the highest limit value as a sample, and the CR value is measured according to the first step to the fourth step.

[0017] A grating type naked eye 3D display screen fitting precision testing device for implementing the foregoing method, comprising a camera collection module, a control module and an analysis and calculation module, a moving platform is arranged below the camera collection module, and a product driving module and a product loading module are installed on the moving platform;

[0018] The camera collection module is used to collect the graphic data of the display screen to be tested, and the camera collection module includes two collection cameras, i.e., a left camera and a right camera.

[0019] The product driving module is used to light the display screen to be tested.

[0020] The product loading module is used to load the display screen to be tested.

[0021] The control module is used for controlling the movement and acquisition work of the camera acquisition module and the product driving module.

[0022] The analysis calculation module is used for calculating and determining the information of the picture acquired by the camera acquisition module.

[0023] Further, the moving platform is installed on a conveying belt, and the conveying belt is used for moving the moving platform to the feeding position and the testing position.

[0024] Further, the analysis calculation module comprises an analysis module and a calculation module, the analysis module is used for analyzing the first luminance value L1, the second luminance value L2 and the third luminance value L3 of the pictures acquired by the left camera and the right camera, and the calculation module is used for calculating the contrast CR of the left camera and the right camera by using the formula CR=(L1-L3) / (L2-L3).

[0025] Further, the left camera and the right camera are both installed through a rotating shaft displacement sliding table.

[0026] Further, the left camera and the right camera are both installed in a movable manner in the horizontal direction, so that the position can be conveniently adjusted.

[0027] Further, the camera acquisition module is installed in a movable manner in the vertical direction, so that the vertical position can be conveniently adjusted.

[0028] Further, the camera acquisition module and the camera are installed in a guide rail sliding block in the horizontal direction.

[0029] Further, the testing device is provided with a safety grating for preventing the body part of an operator from entering the equipment and then stopping the equipment in an emergency.

[0030] The present application has the following beneficial effects:

[0031] 1. The present application replaces the human eye detection with a visual system, uses the corresponding relationship between the fitting alignment deviation and the 3D display contrast, and the fitting alignment deviation is large and the display contrast is low; the fitting precision is evaluated by replacing the size measurement method with the contrast measurement method, and the test efficiency is significantly improved.

[0032] 2. The two acquisition cameras simulate the human eye structure to ensure the accuracy of the image acquisition of the visual system. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings;

[0034] Figure 1 is the schematic diagram of the overall structure of the present application;

[0035] Figure 2 is the schematic diagram of the installation of the mobile platform of the present application;

[0036] Figure 3 is the schematic diagram of the installation of the collection camera of the present application;

[0037] Figure 4 is the schematic diagram of the test picture of the left and right cameras of the present application, and the arrow indicates the picture that can be collected by the corresponding camera;

[0038] Figure 5 is the statistical chart of the test results of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] Embodiment 1, a grating type naked eye 3D display screen fitting precision test method, simulates two eyes by setting left and right double cameras, the cameras sample images of the 3D display screen that is lighted, capture product test area images, and perform contrast calculation analysis on the test area images and feedback the results;

[0041] Left camera image sampling processing analysis:

[0042] (1) first light up the first picture (white and black picture, white vertical bar and black vertical bar are alternated),

[0043] (2) analyze the first brightness value L1 of the collected picture,

[0044] (3) switch to the second picture (black and white picture, black vertical bar and white vertical bar are alternated),

[0045] (4) analyze the second brightness value L2 of the collected picture,

[0046] (5) switch to the third picture (all black picture), and analyze the third brightness value L3,

[0047] (6) calculate the contrast CR1 = (L1-L3) / (L2-L3) by using the obtained data L1, L2 and L3,

[0048] (7) compare the calculated contrast CR1 with the standard value of the contrast,

[0049] (8) If the contrast CR1 is greater than or equal to the standard value, the result is OK, and if the contrast CR1 is less than the standard value, the result is NG.

[0050] Right camera image sampling processing analysis:

[0051] The method is the same as that of the left camera, except that the first picture is a black and white picture, and the second picture is a white and black picture,

[0052] (1) first light up the first picture (black and white picture, black vertical bar white vertical bar alternately),

[0053] (2) analyze the first luminance value L1 of the collected picture.

[0054] (3) switch to the second picture (white and black picture, white vertical bar black vertical bar alternately),

[0055] (4) analyze the second luminance value L2 of the collected picture,

[0056] (5) switch to the third picture (all black picture), analyze the third luminance value L3,

[0057] (6) the above data L1, L2, L3 are obtained, and the contrast CR2 = (L1-L3) / (L2-L3) is calculated,

[0058] (7) compare the contrast CR2 obtained by analysis and calculation with the standard value of contrast,

[0059] (8) If the contrast CR2 is greater than or equal to the standard value, the result is OK, and if the contrast CR2 is less than the standard value, the result is NG.

[0060] The standard value of contrast refers to a 3D display screen with a highest limit value of fitting size deviation (the fitting size deviation can be measured in other ways) as a sample, and the CR value measured according to steps one to four. It is easy to understand that a plurality of samples can be tested to calculate the average CR value as the standard value.

[0061] Embodiment 2: A grating type naked eye 3D display screen fitting precision testing device, comprising a camera collection module 3, a control module and an analysis and calculation module, a moving platform 7 is arranged below the camera collection module 3, and a product driving module 6 and a product loading module 5 are installed on the moving platform 7;

[0062] The camera collection module 3 is used for collecting display screen graphic data to be tested;

[0063] The product driving module 6 is used for lighting the display screen to be tested;

[0064] The product loading module 5 is used for loading the display screen to be tested;

[0065] The control module is used for controlling the movement and acquisition of the camera acquisition module 3 and the product driving module 6.

[0066] The analysis and calculation module is used for calculating and determining the information of the picture acquired by the camera acquisition module 3.

[0067] Further, the moving platform is installed on the conveying belt 8, and the conveying belt 8 is used for moving the moving platform 7 to the loading position and the testing position.

[0068] In some embodiments, the camera acquisition module 3 comprises two acquisition cameras, i.e., a left camera and a right camera. By such a design, the observation habit of human eyes can be simulated to ensure the accuracy of product measurement.

[0069] The analysis and calculation module comprises an analysis module and a calculation module. The analysis module is used for analyzing the first luminance value L1, the second luminance value L2 and the third luminance value L3 of the pictures acquired by the left camera and the right camera. The calculation module is used for calculating the contrast CR of the left camera and the right camera by using the formula CR=(L1-L3) / (L2-L3).

[0070] In some embodiments, the left camera and the right camera are both installed through the rotary shaft displacement sliding table 9. By such a design, the angle of the camera can be rotated, and the observation angle deviation caused by the rotation of human eyes can be better simulated, so that the observation image closer to the human eyes can be obtained to improve the detection precision.

[0071] In some embodiments, the left camera and the right camera are both installed in a movable manner in the horizontal direction, so that the position can be adjusted conveniently. The camera acquisition module is installed in a movable manner in the vertical direction, so that the position in the vertical direction can be adjusted conveniently. The camera acquisition module and the camera are installed in the horizontal direction through the guide rail sliding block 10. By such a design, the distance between the two cameras and the height of the camera from the display screen to be tested can be adjusted according to different testing products, so as to adapt to different product testing.

[0072] In some embodiments, the testing device is provided with a safety grating 4 for preventing the body part of the operator from entering the equipment and then stopping the equipment urgently. By such a design, the safety of the operator can be ensured. Further, the safety grating 4 is connected with the control module.

[0073] Please refer to Figure 4 In some embodiments, the operation steps of the testing device are as follows:

[0074] S1, the software sends an instruction to make the conveying belt move to the loading position;

[0075] S2, after the 3D display screen is loaded, the testing device is started;

[0076] S3, the software sends a command to move the product to the first test area position;

[0077] S4, the 3D display screen switches to picture 1, for example, a white-black picture;

[0078] S5, the left and right cameras automatically sample respectively;

[0079] S6, the software processes to obtain a respective brightness value of the left and right cameras, for example, a first brightness value L1 of the left camera and a second brightness value L2 of the right camera when the white-black picture is displayed;

[0080] S7, the software sends a command to switch the 3D display screen to picture 2, for example, a black-white picture;

[0081] S8, the left and right cameras automatically sample;

[0082] S9, the software processes to obtain another respective brightness value of the left and right cameras, for example, a second brightness value L2 of the left camera and a first brightness value L1 of the right camera when the black-white picture is displayed;

[0083] S10, the software sends a command to switch the 3D display screen to picture 3, for example, a full-black picture;

[0084] S11, the left and right cameras automatically sample;

[0085] S12, the software processes to obtain another respective brightness value of the left and right cameras, for example, a third brightness value L3 of the left camera and a third brightness value L3 of the right camera when the full-black picture is displayed;

[0086] S13, the software calculates the contrast CR of the first test area according to the obtained measurement data L1-L3, including the contrast CR1 corresponding to the left camera and the contrast CR2 corresponding to the right camera;

[0087] S14, after the sampling of the left and right cameras is completed, the software sends a command to move the product to the next test area position;

[0088] S15, the above steps are repeated to continue testing other areas;

[0089] S16, after all the test areas are tested, the software sends a command to close the product software, and the final test result is displayed according to whether the contrast value is greater than the standard value. If the contrast value is greater than or equal to the standard value, it is OK, and if the contrast value is less than the standard value, it is NG. The test data is saved.

[0090] It is easy to understand that the black-white picture, the white-black picture, and the full-black picture can appear only once respectively, and there is no special requirement for the switching order.

[0091] Experimental comparison:

[0092] 1. Test accuracy

[0093] Comparison of measurement results from the testing instrument of this invention with dimensions measured by a microscope;

[0094] Please see Figure 5 For a batch of products with a bonding size deviation threshold of 35μm, 194 pieces were measured under a microscope with a bonding size deviation of less than 30μm (61 pieces were less than or equal to 10μm, 61 pieces were between 10μm and 20μm, and 61 pieces were between 20μm and 30μm), and all of these met the requirements of this invention patent. 21 pieces were measured under a microscope with a bonding size deviation of 30μm to 40μm, and 10 pieces were rated OK and 11 pieces were rated NG, corresponding to the requirements of this invention patent. 5 pieces were measured under a microscope with a bonding size deviation of more than 40μm, and all of these met the requirements of this invention patent.

[0095] The above experimental data demonstrates that this measurement method can address actual bonding size deviations, and the test results are consistent with those obtained using a microscope. Furthermore, through visual observation and comparison, products judged "OK" by the testing instrument exhibit good 3D effects, while those judged "NG" show poor 3D effects. In conclusion, the technical solution proposed in this disclosure can effectively verify the bonding accuracy of grating-type naked-eye 3D displays.

[0096] 2. Testing efficiency

[0097] Testing revealed that the efficiency of measuring the bonding dimensional deviation using a microscope was 100 pcs / h, while the efficiency of measuring the bonding dimensional deviation using the method of this invention was 240 pcs / h. It is evident that the measurement efficiency of this invention is significantly higher than that of microscope measurement.

[0098] Example 3: As Figures 1-3 As shown, a grating-type naked-eye 3D display screen bonding accuracy testing device includes a camera acquisition module 3, a control module, and an analysis and calculation module. A moving platform 7 is located below the camera acquisition module 3. A product driving module 6 and a product loading module 5 are mounted on the moving platform 7. The product loading module 5 is mounted on the product driving module 6, and the moving platform 7 is fixedly mounted on a conveyor belt 8. With this design, the moving platform 7 can be moved by the conveyor belt 8. The product driving module 6 is used to illuminate the display screen to be tested; the product loading module 5 is used to load the display screen to be tested. Furthermore, the moving platform 7 is movably mounted on the conveyor belt 8, thus allowing adjustment of the entire planar position of the moving platform 7 in conjunction with the movement of the conveyor belt 8.

[0099] In some of the disclosure, the camera acquisition module 3 and the conveying belt 8 are both mounted on the equipment support, the PLC setting screen 1 for setting the number of measurement points, the position of measurement points and the measurement parameters is mounted on the equipment support, the PLC setting screen 1 is located above the camera acquisition module 3, the display screen 2 is arranged between the camera acquisition module 3 and the PLC setting screen 1, the display screen 2 is mounted on the equipment support, and the display screen 2 is used for displaying the test software interface.

[0100] In some of the disclosure, the side of the camera acquisition module 3 is provided with a safety grating 4, so that when the body part of the operator enters the equipment during the operation of the equipment, the equipment is stopped urgently.

[0101] In some of the disclosure, the camera acquisition module 3 includes two acquisition cameras of a left camera and a right camera, the left camera and the right camera are both mounted through a rotary shaft displacement sliding table 9, further, the acquisition camera includes a camera body 31 and a lens 32, and the lens 32 can be replaced according to different products.

[0102] In some of the disclosure, the left camera and the right camera are both mounted in a movable mounting mode in the horizontal direction, so as to facilitate the horizontal position adjustment, the camera acquisition module is mounted in a movable mounting mode in the vertical direction, so as to facilitate the vertical position adjustment, further, the camera acquisition module and the camera are mounted through a guide rail sliding block 10.

[0103] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A method for testing the fitting accuracy of a grating-based naked-eye 3D display screen, characterized in that, The method comprises the following steps: Step one: turn on the first picture of the display screen to be tested, and the collection camera of the camera collection module automatically samples and analyzes the first brightness value L1 of the collected picture; Step two: turn on the second picture of the display screen to be tested, and analyze the second brightness value L2 of the collected picture; Step three: turn on the third picture of the display screen to be tested, and analyze the third brightness value L3 of the collected picture; Step four: calculate the contrast CR by the formula CR=(L1-L3) / (L2-L3); Step five: compare the contrast CR calculated by analysis with the standard value of contrast, and if the contrast CR is greater than or equal to the standard value, the result is OK, otherwise, the result is NG; When the collection camera is located at the left eye position, the first picture of the display screen is a white-black picture, the second picture of the display screen is a black-white picture, and the third picture of the display screen is a full-black picture; When the collection camera is located at the right eye position, the first picture of the display screen is a black-white picture, the second picture of the display screen is a white-black picture, and the third picture of the display screen is a full-black picture; The sequence of the steps one, two and three is not limited.

2. The grating-based naked-eye 3D display screen fitting precision test method according to claim 1, characterized in that, The camera collection module comprises a left camera and a right camera simulating the structure of human eyes, and the left camera and the right camera are used as collection cameras to test the display screen to be tested and calculate the contrast CR, and only when the contrast measured by the left camera and the contrast measured by the right camera are both greater than or equal to the standard value, the 3D display screen is determined to be qualified.

3. The grating-based naked-eye 3D display screen fitting precision test method according to claim 1, characterized in that, The standard value of contrast is the CR value measured according to steps one to four by taking the 3D display screen with the highest size deviation as a sample.

4. A grating-type naked-eye 3D display bonding accuracy testing device for implementing the method of any one of claims 1 to 3, comprising a camera acquisition module, a control module, and an analysis and calculation module, characterized in that, A moving platform is arranged below the camera collection module, and a product driving module and a product loading module are installed on the moving platform; The camera collection module is used for collecting graphic data of the display screen to be tested, and comprises a left camera and a right camera as two collection cameras; The product driving module is used for turning on the display screen to be tested; The product loading module is used for loading the display screen to be tested; The control module is used for controlling the movement and collection work of the camera collection module and the product driving module; The analysis and calculation module is used for calculating and processing the information of the collected pictures of the camera collection module and making a judgment.

5. The grating-based naked-eye 3D display screen fitting precision test device according to claim 4, characterized in that, The moving platform is installed on a conveying belt, and the conveying belt is used for moving the moving platform to a feeding position and a testing position.

6. The grating-based naked-eye 3D display screen fitting precision test device according to claim 4, characterized in that, The analysis and calculation module comprises an analysis module and a calculation module, the analysis module is used for analyzing the first brightness value L1, the second brightness value L2 and the third brightness value L3 of the collected pictures of the left camera and the right camera, and the calculation module is used for calculating the contrast CR corresponding to the left camera and the right camera by the formula CR=(L1-L3) / (L2-L3).

7. The grating-based naked-eye 3D display screen fitting precision test device according to claim 4, characterized in that, The camera collection module is installed in an active installation mode in the up-down direction, and the left camera and the right camera are both installed through a rotating shaft displacement sliding table.

8. The grating-based naked-eye 3D display screen fitting precision test device according to claim 4, characterized in that, The left camera and the right camera are both installed in an active installation mode in the horizontal direction.

9. The grating-based naked-eye 3D display screen fitting precision test device according to claim 4, characterized in that, The camera collection module and the camera are installed in a guide rail sliding block in the horizontal direction.

10. The grating-based naked-eye 3D display screen fitting precision test device according to claim 4, characterized in that, The testing device is provided with a safety grating for preventing the body parts of the operator from entering the equipment and then stopping the equipment in an emergency.

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