CN112612152A - Method for detecting visual angle deviation direction of LCD full visual angle VA - Google Patents
Method for detecting visual angle deviation direction of LCD full visual angle VA Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 21
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- 238000012360 testing method Methods 0.000 claims abstract description 60
- 238000001514 detection method Methods 0.000 claims abstract description 57
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- 238000013500 data storage Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
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- 230000007547 defect Effects 0.000 abstract description 8
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 4
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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 relates to the technical field of LCD (liquid crystal display) testing, in particular to a method for detecting the view angle deviation direction of a full view angle VA of an LCD. The method for detecting the visual angle deviation direction of the LCD full visual angle VA selects the video magnifier suitable for the product according to the characteristics of the full visual angle LCD. And the focal length is automatically finely adjusted through an automatic detection and judgment program. When the definition is optimal, collecting a standard pattern at a fixed position; the automatic detection program can automatically detect the registration deviation direction and the deviation value of the ITO circuit combined up and down of the LCD, display the detected deviation value and judge whether the visual angle deviation value of the full-visual-angle product meets the requirement. In addition, the program can clearly detect the defects of convex-concave defects of LCD graphic fonts, poor deformation of the graphic fonts, short circuit, poor scratch and the like. This full visual angle LCD precision detection device's detection precision is high to effectively improve detection efficiency, detect accurate effectively.
Description
Technical Field
The invention relates to the technical field of LCD (liquid crystal display) testing, in particular to a method for detecting the view angle deviation direction of a full view angle VA of an LCD.
Background
The LCD is a common display screen, is one of the display screens widely used in the display industry at present, and has the characteristics of good display effect, simple structure, low energy consumption, high brightness, wide temperature range and the like. LCD liquid crystal display screens are adopted as display terminals in many industries for terminal products, and the LCD liquid crystal display screens can only detect short circuit of single glass which is not boxed.
Existing LCD tests are generally judged by visual inspection of their images using an electrical testing device. This approach is not only inefficient, but also has high demands on the practitioner's vision. Some projector products cannot detect the defects of poor convex-concave of LCD graphic fonts, poor deformation of graphic fonts, short circuit, poor scratch and the like during electrical measurement, and cannot detect the problems of poor combination due to the combination precision being less than 0.01m, narrow visual angle, poor pattern, poor powder aggregation (the powder diameter is less than 3.5 um) caused by ultrasound, poor CS short circuit and the like.
In addition, the VA-LCD of the full view angle type has very high requirements on wide view angles of all directions, the deviation direction of the view angles cannot be identified by the conventional LCD detection method, and whether the view angle range of a product meets the requirements of customers cannot be judged.
Through retrieval, CN201220089701.3 discloses a "detection apparatus for LCD display capable of displaying detection patterns", which comprises an LCD display to be detected and a microscope for detection, wherein the microscope for detection is directly opposite to the LCD display to be detected, and the microscope for detection is connected with a display through a circuit; still including a shell, the head of a shell is equipped with inductive probe, and inductive probe is used for the LCD display screen upper touch probe that awaits measuring towards, a shell be equipped with the response lamp outward, the response lamp is connected with inductive probe circuit. If the circuit connection in the LCD display screen is smooth, the induction probe inducts and transmits the signal to the induction lamp, and the induction lamp is on; if the LCD display screen is short-circuited, the induction lamp is not on; the detection of the microscope can present the detection graph of the internal circuit of the LCD display screen on the display, and the short circuit point can be found more clearly on the display. The method is suitable for detecting the LCD semi-finished product and testing the on-off of the LCD circuit, the graph detection is also the detection in the LCD display screen, and the method cannot identify the nesting deviation direction and dislocation of the LCD glass at the visual angle. Therefore, the method for effectively detecting the visual angle direction and the conventional defects of the LCD has great economic significance and practical value in the industry.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for detecting the viewing angle deviation direction of the LCD full viewing angle VA, and a video magnifier suitable for the product is selected according to the characteristics of the full viewing angle LCD. The focal length is automatically finely adjusted through an automatic detection judgment program, so that the optimal definition required by detection is achieved. When the definition is optimal, collecting a standard pattern at a fixed position; the automatic detection program can automatically detect the registration deviation direction and the deviation value of the ITO circuit combined up and down of the LCD, display the detected deviation value, and simultaneously judge whether the visual angle deviation value of the full-view-angle product meets the requirement according to a preset standard value. In addition, the program can clearly detect the defects of convex-concave defects of LCD graphic fonts, poor deformation of the graphic fonts, short circuit, poor scratch and the like. This full visual angle LCD precision detection device's detection precision is high to effectively improve detection efficiency, detect accurate effectively.
The invention is realized by the following scheme:
disclosed is a method for detecting the view angle deviation direction of the LCD full view angle VA, which comprises the following steps:
s1, placing LCD glass to be tested in an up-and-down combination mode on a fixing device of a detection frame, wherein the detection frame is in a communicated state; simultaneously lightening an LCD backlight source at the bottom of the fixing frame;
s2, aligning the lens of the video magnifier to a test area of the LCD, and adjusting the focal length of the video magnifier to enable imaging to be clear; the video magnifier collects a standard pattern at a fixed position; setting definition indexes of an automatic detection program;
s3, identifying the registration pattern of the LCD glass to be detected, and setting a registration deviation standard;
s4, mapping the collected patterns into a two-dimensional plane graph by the program of the video magnifier, displaying the two-dimensional plane graph on a display, measuring the size of the two-dimensional plane graph, comparing the test size data with the size of the input standard two-dimensional plane graph to obtain a deviation value, and according to the deviation value which can be accepted by the set size, judging OK which meets the requirement and judging NG which does not meet the standard;
s5, displaying OK or NG on a judgment result through a display screen, displaying detection data at the same time, establishing a data storage module by another program, and sequentially storing and recording test data of each product; data can be derived for technician analysis.
Further, the display detection data is that whether the visual angle deviation of the product is qualified or not is judged by an automatic detection program according to a set standard, a deviation direction is identified for unqualified products, a bad code is given, and a tested deviation value is stored.
Further, the video magnifier adopts a CCD video magnifier.
Further, the ITO circuit of the LCD glass to be tested and combined up and down is tested by an electric testing device, the electric testing device comprises a tester and a circuit board electrically connected with the tester, and the LCD glass to be tested and combined up and down is placed on the circuit board.
Furthermore, the testing device adopts a full-view LCD precision detection device and comprises an electric testing device positioning plate, a video magnifier, a display and an automatic detection judging program; the positioning plate of the electric testing device is a positioning mechanism with adjustable length and width dimensions, and is suitable for LCD electric testing frames with different dimensions, after the LCD electric testing frames are positioned, a lens of a video magnifier is suspended above a circuit board of the electric testing frames, and the video magnifier is electrically connected with a display; the circuit board is arranged in the detection frame, the top end of the detection frame is provided with a turnover gland, and the LCD and the circuit board are communicated by adopting press type contact; and a silica gel strip for communicating the circuit board and the LCD and a polaroid required by testing are arranged in the detection frame.
Furthermore, after the electric testing device debugs and sets the electric testing frame, the electric testing frame fixing device is adjusted to fixedly lock the whole electric testing frame to fix the position of the electric testing frame.
Compared with the prior art, the invention has the following beneficial effects:
the method for detecting the visual angle deviation direction of the LCD full visual angle VA solves the following technical problems that the conventional electric measuring machine cannot detect:
1. the problems that LCD graphic fonts are poor in convex-concave, the graphic fonts are poor in deformation, short circuits and poor in scratch, which cannot be detected by LCD full-view VA products, particularly projector products, during electrical measurement are solved.
2. The problems that the LCD full-view angle VA product cannot detect poor combination distortion due to the combination precision smaller than 0.01m, the view angle is wide and narrow, the pattern is poor, the powder aggregation is poor (the powder diameter is smaller than 3.5 um) caused by ultrasound, and the CS short circuit is poor are solved.
3. The method for detecting the visual angle deviation direction of the LCD full visual angle VA can be suitable for different tests and electric test frames of different specifications. The problem of inaccurate pattern deviation detection caused by the position movement of the electric measuring frame during pattern detection is solved.
4. The problem that when people test patterns, the patterns are fuzzy and cannot be effectively judged due to the fact that the CCD focal length deviation of products to be detected is changed is solved.
5. The problem that whether the precision deviation meets the product requirement or not can not be visually and effectively judged by human eye detection is solved.
6. The problem of test statistics record of defective product detection data is solved, statistical analysis is facilitated to be provided for technicians, and product tracking and error correction are facilitated.
7. The problem of capacity that the single-person single-day capacity is improved from 300 to 2000 in the past is solved, and the capacity is greatly improved.
In conclusion, the method can effectively, intelligently and quickly judge the registration deviation and the excellent pattern of the vertically combined LCD glass, has good use performance, can be widely popularized and used in the LCD field, and has higher practical value.
Drawings
FIG. 1 is a schematic structural diagram of a full-viewing-angle LCD precision detection device according to the present invention.
Detailed Description
The following specific examples further illustrate the invention in detail. Unless otherwise indicated, the various starting materials used in the examples of the present invention are either conventionally available commercially or prepared according to conventional methods in the art using equipment commonly used in the laboratory. Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
The method for detecting the viewing angle deviation direction of the LCD full viewing angle VA disclosed by the embodiment comprises the following steps:
s1, placing LCD glass to be tested in an up-and-down combination mode on a fixing device of a detection frame, wherein the fixing device in the example is an electric testing device 10 in the figure 1, and the electric testing device 10 is in a communicated state; and simultaneously lightening an LCD backlight source at the bottom of the fixing frame. Specifically, the ITO line of the LCD glass to be tested combined up and down is tested by an electrical testing device 10 including a tester and a circuit board electrically connected to the tester, on which the LCD glass is mounted. More specifically, the electric testing device 10 adopts a full-view-angle LCD precision detection device, and comprises an electric testing device positioning plate 13, a video magnifier 11, a display 12 and an automatic detection judgment program; the positioning plate 13 (a part of the fixing device) of the electric testing device is a positioning mechanism with adjustable length and width dimensions, and can be suitable for LCD electric testing frames with different dimensions, after the detection frame is positioned, a lens of a video magnifier 11 is suspended above a circuit board of the detection frame, and the video magnifier 11 is electrically connected with a display 12; the circuit board is arranged in the detection frame, the top end of the detection frame is provided with a turnover gland, and the LCD and the circuit board are communicated by adopting press type contact; and a silica gel strip for communicating the circuit board and the LCD and a polaroid required by testing are arranged in the detection frame. The electric testing device positioning plate can adopt the structure of CN206321901U 'an LCD testing device' applied by the company.
S2, aligning the lens of the video magnifier 11 to a test area of a test LCD, and adjusting the focal length of the video magnifier 11 to enable imaging to be clear; the video magnifier 11 collects a standard pattern at a fixed position; setting definition indexes of an automatic detection program; the video magnifier 11 of the present embodiment is a CCD video magnifier.
S3, identifying the registration pattern of the LCD glass to be detected, and setting a registration deviation standard;
s4, mapping the collected patterns by the program of the video magnifier 11 into a two-dimensional plane graph, displaying the two-dimensional plane graph on a display, measuring the size of the two-dimensional plane graph, comparing the test size data with the size of the input standard two-dimensional plane graph to obtain a deviation value, and according to the deviation value which can be accepted by the set size, judging OK which meets the requirement and judging NG which does not meet the standard;
s5, displaying OK or NG on a judgment result through a display screen, displaying detection data at the same time, establishing a data storage module by another program, and sequentially storing and recording test data of each product; data can be derived for technician analysis. The detection method integrates the electric testing device, the video magnifier and the display into a whole, and the video magnifier suitable for the product is selected according to the characteristics of the full-view LCD. The automatic detection and judgment program can automatically finely adjust the focal length, so that the optimal definition required by detection is achieved. When the definition is optimal, the automatic detection program can automatically detect the registration deviation direction and the deviation value of the ITO circuit combined up and down of the LCD, the detected deviation value is displayed, and meanwhile, the program judges whether the visual angle deviation value of the full-view-angle product meets the requirement according to a preset standard value. In addition, the program can clearly detect the defects of convex-concave defects of LCD graphic fonts, poor deformation of the graphic fonts, short circuit, poor scratch and the like. This full visual angle LCD precision detection device's detection precision is high to effectively improve detection efficiency, detect accurate effectively.
The design method of the full-view VA detection program comprises the following steps:
an input module: after fixing the CCD and the product position, the definition is adjusted to the best, and then the CCD collects a standard pattern at a fixed position.
A calculation module: the program maps the collected patterns into a two-dimensional plane graph, then measures the size of the two-dimensional plane graph, compares the test size data with the size of the input standard two-dimensional plane graph, sets a deviation value which can be accepted by the size, and judges that the size meets the requirement OK and does not meet the standard NG;
an output module: and displaying OK or NG and simultaneously displaying the detection data through the display screen. In addition, the program establishes a data storage module, and the test data of each product is stored and recorded in sequence. Data can be derived for technician analysis.
The same or similar reference numerals correspond to the same or similar parts; the positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent. It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. A method for detecting the view angle deviation direction of the LCD full view angle VA is characterized by comprising the following steps:
s1, placing LCD glass to be tested in an up-and-down combination mode on a fixing device of a detection frame, wherein the detection frame is in a communicated state; simultaneously lightening an LCD backlight source at the bottom of the fixing frame;
s2, aligning the lens of the video magnifier to a test area of the LCD, and adjusting the focal length of the video magnifier to enable imaging to be clear; the video magnifier collects a standard pattern at a fixed position; setting definition indexes of an automatic detection program;
s3, identifying the registration pattern of the LCD glass to be detected, and setting a registration deviation standard;
s4, mapping the collected patterns into a two-dimensional plane graph by the program of the video magnifier, displaying the two-dimensional plane graph on a display, measuring the size of the two-dimensional plane graph, comparing the test size data with the size of the input standard two-dimensional plane graph to obtain a deviation value, and according to the deviation value which can be accepted by the set size, judging OK which meets the requirement and judging NG which does not meet the standard;
s5, displaying OK or NG on a judgment result through a display screen, displaying detection data at the same time, establishing a data storage module by another program, and sequentially storing and recording test data of each product; data can be derived for technician analysis.
2. The method as claimed in claim 1, wherein the display inspection data is an automatic inspection program for determining whether the viewing angle deviation of the product is acceptable according to a set standard, identifying the deviation direction for a defective product, giving a bad code, and storing the deviation value of the test.
3. The method for detecting the viewing angle deviation direction of the LCD full viewing angle VA of claim 1, wherein the video magnifier is a CCD video magnifier.
4. The method for detecting the viewing angle deviation direction of the LCD full viewing angle VA according to claim 1, wherein the ITO line of the LCD glass to be tested in the up-down combination is tested by an electrical testing apparatus, the electrical testing apparatus includes a tester and a circuit board electrically connected to the tester, and the LCD glass to be tested in the up-down combination is placed on the circuit board.
5. The method for detecting the viewing angle deviation direction of the LCD full viewing angle VA of claim 4, wherein the testing device adopts a full viewing angle LCD precision detection device, which comprises an electric testing device positioning plate, a video magnifier and a display, and an automatic detection judgment program; the positioning plate of the electric testing device is a positioning mechanism with adjustable length and width dimensions, and is suitable for LCD electric testing frames with different dimensions, after the LCD electric testing frames are positioned, a lens of a video magnifier is suspended above a circuit board of the electric testing frames, and the video magnifier is electrically connected with a display; the circuit board is arranged in the detection frame, the top end of the detection frame is provided with a turnover gland, and the LCD and the circuit board are communicated by adopting press type contact; and a silica gel strip for communicating the circuit board and the LCD and a polaroid required by testing are arranged in the detection frame.
6. The method as claimed in claim 5, wherein the electrical testing apparatus is adapted to set the electrical testing frame, and then fix and lock the electrical testing frame to the fixed electrical testing frame.
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| CN202110095908.5A CN112612152A (en) | 2021-01-25 | 2021-01-25 | Method for detecting visual angle deviation direction of LCD full visual angle VA |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114414211A (en) * | 2021-12-17 | 2022-04-29 | 长春希达电子技术有限公司 | LED display module visual angle defect detection method based on area-array camera |
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|---|---|---|---|---|
| CN201145788Y (en) * | 2006-10-24 | 2008-11-05 | 曹陵 | LCD/LCM automatic optical detector |
| CN102042974A (en) * | 2010-10-29 | 2011-05-04 | 大连佳世电子有限公司 | System for detecting suction nozzle |
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Application publication date: 20210406 |