CN105806850A - LCD (Liquid Crystal Display) glass defect detection device and LCD (Liquid Crystal Display) glass defect detection method - Google Patents
LCD (Liquid Crystal Display) glass defect detection device and LCD (Liquid Crystal Display) glass defect detection method Download PDFInfo
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- CN105806850A CN105806850A CN201610137450.4A CN201610137450A CN105806850A CN 105806850 A CN105806850 A CN 105806850A CN 201610137450 A CN201610137450 A CN 201610137450A CN 105806850 A CN105806850 A CN 105806850A
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- lcd glass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N2021/9513—Liquid crystal panels
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- Life Sciences & Earth Sciences (AREA)
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- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Liquid Crystal (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses an LCD (Liquid Crystal Display) glass defect detection device and LCD (Liquid Crystal Display) glass defect detection method. The detection device comprises a camera, a polarizer, a top surface light source, a back surface light source and a probe. The detection method comprises the following the steps of: step S1, under the state that the probe is not conducted with a testing interface of LCD glass, putting LCD glass to be detected on the back surface light source, wherein the top surface light source is at a turned-off state and the back surface light source is at a turned-on state; step S2, detecting and recording non-substantive defects at the bottom and top of the LCD glass through the camera; step S3, detecting and recording all defects of the LCD glass through the camera; and step S4, in all the defects in the step S3, filtering the non-substantive defects recorded in the step S2, wherein the residual part is substantive defects of the LCD glass. By virtue of the glass defect detection device and method, disclosed by the invention, the detection accuracy is improved, and a false-alarm phenomenon is prevented from occurring.
Description
Technical field
The present invention relates to Display Technique field, particularly relate to a kind of LCD glass defect detection device and detection method.
Background technology
LCD glass, in the process produced, is inevitably stained with dust and other impurities.LCD glass needs to detect before dispatching from the factory, to prevent defective products from flowing out, by Product checking thus improving production quality.
In the defect inspection process of LCD glass; the defects such as the dust on product protection film are not the substantive defects of LCD glass; and in traditional detection technique; above-mentioned unsubstantiality defect can not be filtered by detection photographic head; but this kind of unsubstantiality defect is carried out Taking Pictures recording; send alarm, assert that the LCD glass of current detection is defective products.
Visible, detection technique this kind traditional, owing to can not the unsubstantiality defect in LCD glass be filtered, thus causing the generation of false-alarm phenomenon, causing trouble to the defects detection of LCD glass, reducing the accuracy of detection.
Summary of the invention
It is an object of the invention to overcome weak point of the prior art, it is provided that a kind of accuracy improving detection, it is prevented that the LCD glass defect detection device of false-alarm phenomenon generation and detection method.
It is an object of the invention to be achieved through the following technical solutions:
A kind of LCD glass defect detection device, for detecting LCD glass defect detection device, it is characterised in that including: photographic head, polaroid, end face light source, back side light source and probe；
Described photographic head, described polaroid, described end face light source and described back side light source set gradually along gravity direction；
Described LCD glass is positioned on the light source of the described back side, and described LCD glass is between described end face light source and described back side light source；
Described LCD glass has test interface, and described probe contacts with the test interface of described LCD glass or separates.
Wherein in an embodiment, described end face light source is annular light source.
A kind of LCD glass defect detection method, for LCD glass is detected, comprises the steps:
The test interface of step S1, probe and LCD glass does not turn under state, is positioned on the light source of the back side by LCD glass to be detected, and end face light source is in OFF state, and back side light source is in illuminating state；
Step S2, detects and records the unsubstantiality defect at LCD Glass base and top by photographic head；
Step S3, detects and records all defect of LCD glass by photographic head；
Step S4, in the step S3 all defect found, filters the unsubstantiality defect of step S2 record, and namely remainder is the substantive defect of LCD glass.
Wherein in an embodiment, in step s 2, the unsubstantiality defect detecting and recording LCD glass top comprises the steps:
The test interface of step S201, probe and LCD glass turns on and makes LCD glass to switch to black picture, or the test interface of probe and LCD glass disconnects；
Step S202, extinguishes back side light source, lights end face light source；
Step S203, detects and records the unsubstantiality defect of LCD glass top by photographic head.
The present invention, by providing a kind of LCD glass defect detection device and detection method, improves the accuracy of detection, it is prevented that the generation of false-alarm phenomenon.
Accompanying drawing explanation
Fig. 1 is the structural representation of the LCD glass defect detection device of one embodiment of the invention.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
As it is shown in figure 1, the structural representation of the LCD glass defect detection device 10 that it is one embodiment of the invention.
LCD glass defect detection device 10 is for detecting LCD glass 20.LCD glass defect detection device 10 includes: photographic head 100, polaroid 200, end face light source 300, back side light source 400 and probe 500.
Photographic head 100, polaroid 200, end face light source 300 and back side light source 400 set gradually along gravity direction.
LCD glass 20 is positioned on back side light source 400, and LCD glass 20 is between end face light source 300 and back side light source 400.
LCD glass 20 has test interface 22, and probe 500 contacts with the test interface 22 of LCD glass 20 or separates.Probe 500 is for providing the signal of telecommunication for LCD glass 20 so that LCD glass 20 can carry out the switching of picture.
It should also be noted that in the present embodiment, end face light source 300 is annular light source, adopts annular light source compared to other other than ring type light source, and it can reach better to test effect, it is possible to improves the accuracy of detection.
Corresponding with above-mentioned LCD glass defect detection device 10, it is provided that a kind of LCD glass defect detection method, for LCD glass is detected, comprise the steps:
The test interface of step S1, probe and LCD glass does not turn under state, is positioned on the light source of the back side by LCD glass to be detected, and end face light source is in OFF state, and back side light source is in illuminating state；
Step S2, detects and records the unsubstantiality defect at LCD Glass base and top by photographic head；
Step S3, detects and records all defect of LCD glass by photographic head；
Step S4, in the step S3 all defect found, filters the unsubstantiality defect of step S2 record, and namely remainder is the substantive defect of LCD glass.
Further, in step s 2, detect and record the unsubstantiality defect of LCD glass top and comprise the steps:
The test interface of step S201, probe and LCD glass turns on and makes LCD glass to switch to black picture, or the test interface of probe and LCD glass disconnects；
Step S202, extinguishes back side light source, lights end face light source；
Step S203, detects and records the unsubstantiality defect of LCD glass top by photographic head.
At this, unsubstantiality defect is considered as the dust granule in LCD glass surface bonding.
Wherein, step S2 includes:
Step S21, obtains the image under current state by photographic head；
Step S22, carries out binaryzation to the image in step S21, obtains bianry image, and wherein highlight color region part is the unsubstantiality defect of LCD glass bottom surface.
Step S3 includes:
Step S31, when LCD glass is switched to light tone picture, closes end face light source and the back side light source of LCD glass outer, and obtains the image under current state；
Step S32, carries out binaryzation to the image in step S31, obtains bianry image.
Step S4 includes:
Step S41, deducts the S22 bianry image obtained by the bianry image obtained in step S32, obtains a new bianry image, and what its highlight color region showed is the real defect of LCD glass；
Step4Image (i, j)=Step3Image (i, j) Step2Image (i, j)；
(i, j), (i, j), (i j) represents the brightness value of the pixel of the i-th row jth row in the obtained bianry image of step S41, step S32, step S22 to Step2Image to Step3Image to Step4Image in formula respectively；
Step S42, searches connected region on the step S41 bianry image obtained and is real defect.
The method obtaining bianry image is:
Predetermined threshold value, is divided into prospect, two images of background, prospect n by original image1, csum, m1The prospect represented under present threshold value is counted, moment of mass, average gray；Background n2, sum-csum, m2The background represented under present threshold value is counted, moment of mass, average gray；
When taking optimal threshold, background is maximum with prospect difference, adopts maximum between-cluster variance to select optimal threshold as the standard weighing difference,
The derivation of maximum variance between clusters: note t is the segmentation threshold of prospect and background, and prospect is counted and accounted for image scaled is w0, average gray is u0；Background is counted and accounted for image scaled is w1, average gray is u1, then the grand mean gray scale of image is: u=w0*u0+w1*u1,
The variance of prospect and background map picture: g=w0*(u0-u)*(u0-u)+w1*(u1-u)*(u1-u)=w0*w1*(u0-u1)*(u0-u1),
When variance g is maximum, it is believed that now prospect and background difference are maximum, and namely gray scale now is optimal threshold.
The present invention, by providing a kind of LCD glass defect detection device and detection method, improves the accuracy of detection, it is prevented that the generation of false-alarm phenomenon.
Above-described embodiment is the present invention preferably embodiment; but embodiments of the present invention are also not restricted to the described embodiments; the change made under other any spirit without departing from the present invention and principle, modification, replacement, combination, simplification; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (4)
1. a LCD glass defect detection device, for detecting LCD glass defect detection device, it is characterised in that including: photographic head, polaroid, end face light source, back side light source and probe；
Described photographic head, described polaroid, described end face light source and described back side light source set gradually along gravity direction；
Described LCD glass is positioned on the light source of the described back side, and described LCD glass is between described end face light source and described back side light source；
Described LCD glass has test interface, and described probe contacts with the test interface of described LCD glass or separates.
2. LCD glass defect detection device according to claim 1, it is characterised in that described end face light source is annular light source.
3. a LCD glass defect detection method, for detecting LCD glass, it is characterised in that comprise the steps:
The test interface of step S1, probe and LCD glass does not turn under state, is positioned on the light source of the back side by LCD glass to be detected, and end face light source is in OFF state, and back side light source is in illuminating state；
Step S2, detects and records the unsubstantiality defect at LCD Glass base and top by photographic head；
Step S3, detects and records all defect of LCD glass by photographic head；
Step S4, in the step S3 all defect found, filters the unsubstantiality defect of step S2 record, and namely remainder is the substantive defect of LCD glass.
4. LCD glass defect detection method according to claim 3, it is characterised in that in step s 2, the unsubstantiality defect detecting and recording LCD glass top comprises the steps:
The test interface of step S201, probe and LCD glass turns on and makes LCD glass to switch to black picture, or the test interface of probe and LCD glass disconnects；
Step S202, extinguishes back side light source, lights end face light source；
Step S203, detects and records the unsubstantiality defect of LCD glass top by photographic head.
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| CN201610137450.4A CN105806850A (en) | 2016-03-10 | 2016-03-10 | LCD (Liquid Crystal Display) glass defect detection device and LCD (Liquid Crystal Display) glass defect detection method |
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| CN201610137450.4A CN105806850A (en) | 2016-03-10 | 2016-03-10 | LCD (Liquid Crystal Display) glass defect detection device and LCD (Liquid Crystal Display) glass defect detection method |
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Cited By (3)
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| CN107219229A (en) * | 2017-05-16 | 2017-09-29 | 武汉精测电子技术股份有限公司 | A kind of panel filtering dust method and device |
| CN107677686A (en) * | 2017-09-28 | 2018-02-09 | 京东方科技集团股份有限公司 | Equipment of the light through window integrating device and using the device |
| CN108267448A (en) * | 2018-01-23 | 2018-07-10 | 上海读家电子科技有限公司 | A kind of backlight operating mechanism for ceramic substrate detection |
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| CN107677686B (en) * | 2017-09-28 | 2021-01-26 | 京东方科技集团股份有限公司 | Light transmission window integrated device and equipment adopting same |
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