CN114637134A - Anti-failure method of LCD (liquid crystal display) bad point detection system - Google Patents
Anti-failure method of LCD (liquid crystal display) bad point detection system Download PDFInfo
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- CN114637134A CN114637134A CN202210136801.5A CN202210136801A CN114637134A CN 114637134 A CN114637134 A CN 114637134A CN 202210136801 A CN202210136801 A CN 202210136801A CN 114637134 A CN114637134 A CN 114637134A
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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
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Abstract
The invention discloses a failure prevention method of an LCD dead pixel detection system, which comprises the following steps: s1, self-checking preparation, wherein the computer control product displays a self-checking picture and controls a camera to shoot the self-checking picture; s2, self-checking and judging, wherein the computer receives the self-checking picture shot by the camera and detects and calculates the self-checking picture to obtain the number a of self-checking dead points; then comparing the self-inspection dead pixel with a preset dead pixel and judging; s3, self-checking and adjusting, when the step S2 judges that the LCD dead pixel detection system fails, the LCD dead pixel detection system is calibrated and adjusted, and the steps S1 to S2 are repeated: s4, finishing self-checking, and when the LCD dead pixel detection system is judged to be normal in the step S2, entering a dead pixel detection flow by the LCD dead pixel detection system; the LCD dead pixel detection system is added with the self-checking flow, so that the system can be self-checked, and the mass outflow of defective products caused by system failure and no knowledge is avoided.
Description
Technical Field
The invention relates to the field of production of LCD (liquid crystal display) plates, in particular to an anti-failure method of an LCD dead pixel detection system.
Background
The LCD panel is formed by combining a large number of pixel points and is a carrier for presenting black and white and three primary colors of red, yellow and blue. Different pictures can be presented by combining pixel points with different colors, but a few pixel points on some LCD screens can always change according to the change of the requirement, so that only one color can be kept forever, the appearance of the whole picture is greatly influenced, the integral visual effect is influenced, and the problem that the whole screen can be solved only by replacing the whole screen is solved frequently.
But in the middle of present prior art, the dependence of the effect that detects is extremely strong to camera effect of shooing, and current technique also can't carry out the self-checking in addition, in case the effect of shooing of camera goes wrong, causes the bulk defective products to flow out very easily, and the system does not make any screening interception yet. The photographing effect of the camera depends on various parameters, among the parameters, many parameters such as focal length, photographing distance and the like cannot be accurately fixed through software, the parameters are very easily influenced by external factors, the photographing effect of the camera is very unstable and is easily tampered, so that the originally clear and visible dead pixel is covered by surrounding bright light under the condition that the photographing of the camera is fuzzy, the system cannot make correct judgment, defective products easily flow out, and the instability of the existing LCD dead pixel detection system is also caused.
Disclosure of Invention
The present invention aims to overcome the above-mentioned shortcomings and provide a technical solution to solve the above-mentioned problems.
A method for preventing failure of LCD bad point detection system comprises the following steps:
s1, self-checking preparation, wherein the computer control product displays a self-checking picture and controls a camera to shoot the self-checking picture, and n preset dead pixels exist in the self-checking picture;
s2, self-checking and judging, wherein the computer receives the self-checking picture shot by the camera and detects and calculates the self-checking picture to obtain the number a of self-checking dead points; when the number of the self-detection dead points is less than the number of the preset dead points (namely a < n), judging that the LCD dead point detection system is invalid; judging that the LCD dead pixel detection system is normal when the detected dead pixel number is equal to the number of preset dead pixels (namely a is n);
s3, self-checking and adjusting, when the step S2 judges that the LCD dead pixel detection system fails, calibrating and adjusting the LCD dead pixel detection system, and repeating the steps S1 to S2;
and S4, finishing self-checking, and when the LCD dead pixel detection system is judged to be normal in the step S2, entering a dead pixel detection flow into the LCD dead pixel detection system.
Preferably, step S0 is also preceded by step S1: the work preparation, fix the product in the acupuncture point, and send into the dark box that detects and use.
Preferably, there is also a step S1.1 between step S1 and step S2: and (4) self-checking work, wherein after the computer receives a self-checking picture shot by the camera, the area of the display screen is also detected and intercepted through software.
Preferably, the software in said step S1.1 detects and intercepts the display area of the LCD panel by means of an edge detection algorithm.
Preferably, the self-checking screen in step S1 is a white screen; the preset dead pixels are a plurality of fixed non-lighted pixel points.
Preferably, the number of the preset dead pixels is 5, and the preset dead pixels are respectively arranged at the four corners and the center of the LCD panel.
Preferably, the dead pixel detection process includes the following steps:
s4.1, sending an instruction by a computer to enable a product to light the whole picture and control a camera to shoot the whole detection picture;
s4.2, receiving a detection picture shot by a camera by a computer and intercepting a display screen area through an edge detection algorithm of software;
s4.3, detecting and calculating the intercepted display screen area by the computer to obtain the number b of detected dead pixels; when the number b of the detected dead points is equal to zero (namely b is equal to 0), judging that the product is good; and when the number b of the detected dead spots is larger than zero (namely b is larger than 0), judging that the product is a defective product.
Preferably, step S2.1 is also performed after step S2: and judging the product to be a defective product when the number of the self-checking defective points is greater than the number of the preset defective points (namely a > n).
Preferably, the calibration and adjustment work of the LCD dead pixel detection system in step S3 may be performed by an engineer.
Compared with the prior art, the invention has the beneficial effects that:
1. in the failure prevention method of the LCD dead pixel detection system, the LCD dead pixel detection system is self-checked by adding a self-checking flow in the LCD dead pixel detection system, so that the problem that the failure of the LCD dead pixel detection system cannot be known due to disturbance of an external factor on the LCD dead pixel detection system is avoided, and the mass outflow of defective products is avoided.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a core flow diagram of the present invention.
FIG. 2 is a schematic flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described later can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1-2, in an embodiment of the present invention, a method for preventing failure of an LCD dead pixel detection system includes the following steps:
s1, self-checking preparation, wherein the computer control product displays a self-checking picture and controls a camera to shoot the self-checking picture, and n preset dead pixels exist in the self-checking picture;
s2, self-checking and judging, wherein the computer receives the self-checking picture shot by the camera and detects and calculates the self-checking picture to obtain the number a of self-checking dead points; when the number of the self-detection dead points is less than the number of the preset dead points (namely a < n), judging that the LCD dead point detection system fails; judging that the LCD dead pixel detection system is normal when the detected dead pixel number is equal to the number of preset dead pixels (namely a is n);
s3, self-checking and adjusting, when the step S2 judges that the LCD dead pixel detection system fails, calibrating and adjusting the LCD dead pixel detection system, and repeating the steps S1 to S2;
and S4, finishing self-checking, and when the LCD dead pixel detection system is judged to be normal in the step S2, entering a dead pixel detection flow into the LCD dead pixel detection system.
It should be noted that in some embodiments, the LCD dead-spot detection system performs the self-test procedure from step S1 to step S2 before each product to be detected is detected, so as to ensure that the LCD dead-spot detection system is effective in detecting each product.
Particularly, in other embodiments, in the detection process of the LCD dead pixel detection system, the LCD dead pixel detection system may regularly perform the self-checking process, such as starting the self-checking process at certain intervals or starting the self-checking process after a certain number of detection products are separated, and then in the process, the LCD dead pixel detection system is periodically detected to avoid the outflow of the defective products in batches. When detecting that LCD dead pixel detecting system is invalid, can send out the alarm and remind to the operator calibrates and adjusts LCD dead pixel detecting system, then detects the qualified product of preceding detection of the current product that detects LCD dead pixel detecting system failure again, until the yields appears.
The method can effectively avoid the mass outflow of defective products, and improves the detection efficiency of the LCD dead pixel detection system.
Step S0 is also preceded by step S1: the work preparation, fix the product in the acupuncture point, and send into the dark box that detects and use.
It should be particularly noted that in some embodiments, the dark box is fixed on the assembly line, and the assembly line is provided with a plurality of acupuncture point devices for fixing the product to be detected; simultaneously, also have in the camera bellows to carry out fixed spacing device structure and damping device to the acupuncture point device, avoid some products of waiting to detect of acupuncture point device and acupuncture point device internal fixation to rock under the influence of external factor and cause the camera to shoot unclear, and then the influence detects LCD bad point detecting system's judgement, reduces detection efficiency.
Between step S1 and step S2 is also step S1.1: and (4) self-checking work, wherein after the computer receives a self-checking picture shot by the camera, the area of the display screen is also detected and intercepted through software.
The software in step S1.1 detects and intercepts the display area of the LCD panel by means of an edge detection algorithm.
It should be noted that the camera shooting is the area in the whole camera bellows, and the actual detection is the LCD display screen area of the product, and the difference between the two is large, which may cause obstruction and burden to the computer calculation, therefore, in some embodiments, the image shot by the camera needs to be cut and intercepted by the edge detection algorithm to reach the appropriate range, which may reduce the obstruction and burden of the computer calculation, and improve the detection efficiency of the LCD dead pixel detection system.
The self-checking picture in the step S1 is a white screen; and presetting the dead pixels as a plurality of fixed non-lighting pixel points.
It should be noted that, in some embodiments, the self-checking frame is a white screen, and the default dead pixels are a plurality of non-lighted pixels. In the self-checking process, when the LCD dead pixel detection system detects the preset dead pixels, the LCD dead pixel detection system is judged to be normal without failure; when the LCD dead pixel detection system can not detect the preset dead pixels, the failure of the LCD dead pixel detection system can be judged, and calibration and adjustment are needed.
The number of the preset dead pixels is 5, and the preset dead pixels are respectively arranged at the four corners and the center of the LCD panel.
It should be noted that, in some embodiments, the preset dead pixel at the four corners selects the pixel in the second row and the second column of the LCD panel, and the preset dead pixel at the center selects the pixel in the middle of the LCD panel. The selection of the preset dead point position can ensure the detection range of the LCD plate to the maximum extent and improve the detection efficiency
It should be noted that, in some embodiments, the predetermined defective pixels at the four corners and the center of the LCD panel may also perform a positioning function, so as to facilitate positioning and calibrating the position direction of the LCD panel.
The dead pixel detection process comprises the following steps:
s4.1, sending an instruction by a computer to enable a product to light the whole picture and control a camera to shoot the whole detection picture;
s4.2, receiving a detection picture shot by a camera by a computer and intercepting a display screen area through an edge detection algorithm of software;
s4.3, detecting and calculating the intercepted display screen area by the computer to obtain the number b of detected dead pixels; when the number b of the detected dead points is equal to zero (namely b is equal to 0), judging that the product is good; and when the number b of the detected dead spots is larger than zero (namely b is larger than 0), judging that the product is a defective product.
Step S2.1 follows step S2: and judging the product to be a defective product when the number of the self-checking defective points is greater than the number of the preset defective points (namely a > n).
Particularly, in the self-inspection flow of the LCD dead pixel detection system, when the number of self-inspection dead pixels is greater than the number of preset dead pixels (i.e. a > n), the product and the LCD dead pixel detection system need to be inspected to determine whether there is interference from the outside, such as a shielding object, which affects the detection result of the LCD dead pixel detection system; and after the detection is finished, replacing the product and performing the self-detection process of the LCD dead pixel detection system again to avoid the influence of external adverse factors on the prevention of the LCD dead pixel detection system.
The calibration and adjustment work for the LCD dead pixel detection system in step S3 may be performed by an engineer.
It should be noted that, in some embodiments, the efficiency of LCD dead pixel detection can be greatly improved through the cooperation of the industrial robot and the production line, and the efficiency of calibration and adjustment of the LCD dead pixel detection system in the self-detection process of the LCD dead pixel detection system is improved, the calibration accuracy is improved, and the calibration time is reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (9)
1. A method for preventing failure of an LCD bad point detection system comprises the following steps:
s1, self-checking preparation, wherein the computer control product displays a self-checking picture and controls a camera to shoot the self-checking picture, and n preset dead pixels exist in the self-checking picture;
s2, self-checking and judging, wherein the computer receives the self-checking picture shot by the camera and detects and calculates the self-checking picture to obtain the number a of self-checking dead points; when the number of the self-detection dead points is less than the number of the preset dead points (namely a < n), judging that the LCD dead point detection system is invalid; judging that the LCD dead pixel detection system is normal when the detected dead pixel number is equal to the number of preset dead pixels (namely a is n);
s3, self-checking and adjusting, when the step S2 judges that the LCD dead pixel detection system fails, calibrating and adjusting the LCD dead pixel detection system, and repeating the steps S1 to S2;
and S4, finishing self-checking, and when the LCD dead pixel detection system is judged to be normal in the step S2, entering a dead pixel detection flow into the LCD dead pixel detection system.
2. The method of claim 1, further comprising a step S0 before the step S1: the work preparation, fix the product in the acupuncture point, and send into the dark box that detects and use.
3. The method of claim 1, further comprising a step S1.1 between the step S1 and the step S2: and (4) self-checking work, wherein after the computer receives a self-checking picture shot by the camera, the area of the display screen is also detected and intercepted through software.
4. The method of claim 3, wherein the software of step S1.1 detects and intercepts the display area of the LCD panel by an edge detection algorithm.
5. The method of claim 1, wherein the self-test picture in step S1 is a white screen; the preset dead pixels are a plurality of fixed non-lighting pixel points.
6. The method of claim 5, wherein the predetermined number of defective pixels is 5, which are respectively disposed at four corners and a center of the LCD panel.
7. The method of claim 1, wherein the bad point detection process comprises the steps of:
s4.1, sending an instruction by a computer to enable a product to light the whole picture and control a camera to shoot the whole detection picture;
s4.2, receiving a detection picture shot by a camera by a computer and intercepting a display screen area through an edge detection algorithm of software;
s4.3, detecting and calculating the intercepted display screen area by the computer to obtain the number b of detected dead pixels; when the number b of the detected dead points is equal to zero (namely b is equal to 0), judging that the product is good; and when the number b of the detected dead spots is larger than zero (namely b is larger than 0), judging that the product is a defective product.
8. The method of claim 1, further comprising a step S2.1 of determining the product as a defective product when the number of self-inspected defective points is greater than the predetermined number of defective points (i.e., a > n) after the step S2.
9. The method of claim 1, wherein the calibration and adjustment of the LCD dead pixel detection system in step S3 can be performed by an engineer.
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| CN202210136801.5A CN114637134A (en) | 2022-02-15 | 2022-02-15 | Anti-failure method of LCD (liquid crystal display) bad point detection system |
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| CN202210136801.5A CN114637134A (en) | 2022-02-15 | 2022-02-15 | Anti-failure method of LCD (liquid crystal display) bad point detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116708633A (en) * | 2023-08-07 | 2023-09-05 | 深圳市达瑞电子科技有限公司 | Mobile phone screen dead pixel automatic detection method and detection system based on significance analysis |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116708633A (en) * | 2023-08-07 | 2023-09-05 | 深圳市达瑞电子科技有限公司 | Mobile phone screen dead pixel automatic detection method and detection system based on significance analysis |
| CN116708633B (en) * | 2023-08-07 | 2023-11-07 | 深圳市达瑞电子科技有限公司 | Mobile phone screen dead pixel automatic detection method and detection system based on significance analysis |
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