CN107228864A - The detecting system of panel surface defect - Google Patents
The detecting system of panel surface defect Download PDFInfo
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- CN107228864A CN107228864A CN201610169302.0A CN201610169302A CN107228864A CN 107228864 A CN107228864 A CN 107228864A CN 201610169302 A CN201610169302 A CN 201610169302A CN 107228864 A CN107228864 A CN 107228864A
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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
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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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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses a kind of detecting system of panel surface defect, including the optical system set around area array cameras and the graphics processing unit being connected with area array cameras, optical system includes source of parallel light component and mechanical structure, source of parallel light component is using camera lens as absolute center, and around camera lens, incident light is set to be irradiated on display panel to be detected, so that the reflected light of surface defect enters in camera lens, so as to detect surface defect, compared with line-scan digital camera technology, the use of area array cameras can reduce the complexity of whole detection system, by setting up light source assembly special construction, ensure that special angle is realized, and be imaged using single and combine image processing algorithm, the surface defect of display panel can be detected, tentatively cause detection efficiency lifting more than 50%.
Description
Technical field
The invention belongs to the defect detecting technique field of display panel, specifically, the present invention relates to one
Plant the detecting system that small-medium size display panel, particularly LCD are shown as the surface defect after box.
Background technology
Existing small-medium size display module is generally liquid crystal LCD, OLED etc., and its manufacturing process is more multiple
It is miscellaneous, wherein conveyance is a basic sport technique segment, but as ultra-thin, Touch touches etc. will
More and more higher is sought, existing conveyance technology exposes following problem more and more：When using sucker
When mode is transported, chip adhered on sucker etc. is often by the surface tear of display module, sucker
Supporting construction destruction in pixel display area is also caused display bad by pressure.When using crawler type or roller type
When being transmitted, then can regular scratch surface, cause surface fracture etc..Moreover, mould will shown
Version from 1T be thinned to 0.4T or be thinner when, these situations can further deteriorate.
Therefore, before display panel modularity engineering is carried out, the detection before being dispatched from the factory is very heavy
Want.However, when generally using human eye detection, False Rate height and inefficiency.Now, Ye You states
Outer machine vision special equipment, these are directed to the NI Vision Builder for Automated Inspection of panel surface defect, main
It is complicated using the high-resolution of camera using line-scan digital camera scanning or newest TDI cameras
Optical module (wherein, camera lens from measured object surface farther out, designs to assemble reflected light) or knot
Structure designs upper close measurand to detect surface defect, and must pass through camera lens and detected object
Relative motion complete scanning, but these equipment are technically also immature, are embodied in detection
Poor universality, particularly accuracy rate, less efficient, complicated integral structure.Such as Chinese patent
CN101115988A discloses a kind of apparatus and method for detecting defect at glass sheet end surface, this method
Elaborate line-scan digital camera, be to coordinate structures such as the light source of scanning etc..In terms of detection object, it is detected
Be glass surface, it is scanned using line-scan digital camera to glass surface, is one complicated high-precision
The mechanical movement platform (such as weigh several tons of vibration-damped table) of degree.It is familiar with the industry of machine vision in the industry
Personnel understand that the different detection object of correspondence, key is light-source system.Using line-scan digital camera, one
As add light source, such as optical fiber source in the corresponding regions of camera CCD, this light source and camera are relative to tested
Survey glass surface motion and complete scanning, it is not necessary to cover detected object all surfaces, and need not
There is incident direction (angular range), RGB, brightness etc. for panel surface physical imperfection
It is required that, when taking pictures, light source needs occur relative motion with camera and tested display panel.Cause
This, is highly desirable to a kind of display panels such as LCD, OLED that are directed to and (is mainly into after box in current industry
State) light-source system, it is relative between camera and tested display panel that need not can occur
Motion ground carries out the surface defects detection of display panel.
The content of the invention
Most foreign technologies carry out glass surface detection, and such a technology using line-scan digital camera scan mode
It is too high to rely on high cleanliness factor (generally having the investment in terms of cleaning technique).Ground by unremitting
Study carefully, inventors have surprisingly discovered that by using parallel area source around area array cameras to be checked
The surface defect of the display panel of survey is detected, can be readily available the essence of panel surface defect
Really detection, and simple in construction, operation simplifies.
, should the invention discloses a kind of detecting system of panel surface defect for problem above
Detecting system has used for reference published multiple field of machine vision patented technologies, and these patented technologies are retouched
The imaging system that light source and industrial camera are combined has been stated, has been machine vision well known method in the industry.But
Using line-scan digital camera more in display panel the field, and the present invention does not retrieve phase using face battle array industrial camera
Patent is answered, equipment vendors is not seen yet and uses the technology.Including the optics set around area array cameras
System and the graphics processing unit being connected with area array cameras.The optical system includes source of parallel light group
Part and mechanical structure, source of parallel light component is using camera lens as absolute center, and around camera lens,
It is to use area array cameras machine vision well known method in the industry, although the incident light of light source assembly is irradiated to
On display panel to be detected, so that the reflected light of surface defect enters in camera lens, so as to detect
It is intelligible technical principle in the industry to surface defect, but through experiment, the vertical direction with camera lens
It is the protection point of the invention for detecting defect method to form certain degree.In addition, with line-scan digital camera technology
Compare, the use of area array cameras can reduce the complexity of whole detection system, although be that can manage in the industry
Solution, but apply in display panel field, it is the advantage of the present invention.It is special by setting up light source assembly
Different structure, it is ensured that special angle is realized, and is imaged using single and is combined image processing algorithm, i.e.,
The surface defect of display panel can be detected, tentatively causes detection efficiency lifting more than 50%, is the present invention
Advantage.
Wherein, the special angle refers to the incident light of source of parallel light component and hanging down for area array cameras camera lens
Nogata to angular range at 20 degree to 30 degree, preferred 23-28 degree.This angular range ensure that aobvious
Show that surface defect scuffing, concave point, breakage of panel etc. can be appeared in camera image.
Wherein, source of parallel light component is parallel area source and annular area source.
Further, parallel area source be around area array cameras camera lens several are symmetrically arranged parallel
Area source, preferably 4 symmetrically arranged parallel area sources.
Wherein, there is mirror image because being detected display panel, this source of parallel light component exists with camera lens
Horizontal direction has a certain distance scope, size of the distance range at least above display panel.For example,
Tested display panel center is overlapped with optical center, and the display panel length of side is 15cm, then light source is to camera lens
Horizontal range ensure be more than 15cm.
Wherein, the light source assembly, in order to obtain wider array of angular range, the present invention proposes layering cloth
The structure of office's light source, i.e. vertical direction are closely one layer, far another layer of distance, with such apart from camera lens
Push away, can be with Multi-layer design.Distance therein, it is relevant with accurate debugging result.The embodiment of the present invention
That mentions designs for two layers, and vertical direction is apart from camera lens, respectively 5cm~200cm, 10~500cm.
Wherein, the intensity of light source of parallel area source is in 500nit-5000nit.
Wherein, the incident light of the light source is the visible ray of blueness (with the type selecting of area array cameras and being tested
The susceptibility of the defect of display panel is related).
Wherein, any light source in the light source assembly, is adjusted by corresponding Machine Design, makes it
The surface of the whole tested display panel of spot center covering.
Panel surface defects detection scheme with being scanned formula using line-scan digital camera in the prior art
Compare, the area array cameras used in the present invention is with tested display panel without relative motion, and reduction is overall
The complexity of detecting system, and by setting up light source assembly structure, schemed using Polaroid and combination
As Processing Algorithm, you can the surface defect of detection display panel, the complexity of detecting system of the invention
Substantially reduce, detection efficiency lifting more than 50%.
Brief description of the drawings
Fig. 1 is the defect photo taken by the detecting system of the panel surface defect of the present invention；
Fig. 2 is the structural representation of the detecting system of the panel surface defect of an embodiment of the present invention
Figure；Light source assembly sets the situation of parallel area source from front, rear, left and right four direction；
Wherein, 1- area array cameras；2- display panels；3- light source assemblies；4- surface defects.
Fig. 3 is hierarchical layout in the detecting system of the panel surface defect of an embodiment of the present invention
The schematic diagram of light source assembly；Wherein, 1- area array cameras；2- display panels；3- light source assemblies.
The light reflection schematic diagram of the panel surface defect of Fig. 4 an embodiment of the present invention.
Embodiment
The detecting system to the panel surface defect of the present invention is carried out furtherly below in conjunction with the accompanying drawings
It is bright, what the explanation was merely exemplary, it is no intended to limit the scope of the invention.
First, with the pit defects of one of panel surface defect (scanning electron microscope (SEM) photograph is referring to Fig. 1)
Illustrated exemplified by detection, Fig. 2 is the inspection of the panel surface defect of an embodiment of the present invention
The structural representation of examining system, the detecting system includes being arranged on the top of display panel 2 to be detected
Area array cameras 1 and the optical system set around area array cameras 1 and it is connected with area array cameras 1
Graphics processing unit (belongs to part known in the art, do not elaborate in the present invention), institute
State optical system including source of parallel light component 3 and mechanical structure (be mechanically fixed light source part,
Do not elaborated in the present invention), source of parallel light component is centered on the camera lens of area array cameras 1 and encloses
Around camera lens, it is configured with the vertical direction formation certain degree of camera lens, source of parallel light component enters
Penetrate illumination to be mapped on display panel 1 to be detected, so that surface defect 4 is reflected into display to be measured
In area array cameras camera lens above panel, so as to detect surface defect.In the specific embodiment party
In formula, four parallel surface light source components the pasts, rear, left and right four directions are symmetrical arranged around face
The camera lens of array camera is set, the incident light that four plane area sources are launched with camera lens vertical direction
Incident, 300~5000nit of the intensity of light source into 3~60 degree of angles.The present invention uses area array cameras one
Secondary imaging, and ensure that camera lens and measurand position are not moved, by panel surface
Defect is shot, and is eventually passed through image processing software and is identified.
In a specific embodiment, distribution of the panel surface pit defects in display panel
Position is random, and shape size is different, depth is different.In order to detect comprehensively, it is necessary to right
Light source assembly structure of the present invention is further perfect, and mainly angular range further expands, and both realizes
Wide-angle realizes low-angle again, at the same still to evade said light source in display panel minute surface into
The problem of picture, the present invention proposes the structure of hierarchical layout's light source assembly.Fig. 3 is real for the present invention one
The schematic diagram of hierarchical layout's light source assembly in the detecting system for the panel surface defect for applying mode.
In combination with following narration, give in the detecting system of panel surface defect using the present invention
(other defect is similar, no longer goes to live in the household of one's in-laws on getting married with panel surface pit defects for the light transmitting of light source assembly
Stating) place is reflected into the schematic diagram of area array cameras.
As shown in figure 3, close to the left-right and front-back of camera lens, totally four light sources are first layer light to vertical direction
Source, its distance is 15cm-20cm；Away from camera lens slightly remote left-right and front-back, totally four light sources are vertical direction
Second layer light source, its distance is 20cm-30cm.Use blue luminescent diode array.Camera lens away from
From with a distance from LCD display panel in 50cm-200cm, in tested display panel center.Used
Lens focus is 20mm-80mm.
Each light source in light source assembly is adjusted, its center spot is covered tested display panel.
Above structure so that incident angular range can extend down into the scope of 0 to 90 degree upwards.
Light source is opened, display panel is tested from the irradiation of light source emergent ray, at pit defects always
There is light to be reflected, as shown in Figure 4.Control camera is taken pictures, and now occurs the concave point in the picture
Defect, eventually passes through image processing software and is identified.
Present invention layering light source assembly layout, can cause panel surface pit defects to examine comprehensively
Go out, not because defect has in result in factors such as the distributing positions, shape size, depth of display panel
Difference, be the present invention lifting Detection accuracy basic reason.
Although the embodiment to the present invention gives detailed description and illustrated above, should
It is intended that, we can carry out various equivalent changes to above-mentioned embodiment according to the conception of the present invention
And modification, during the spirit that function produced by it is still covered without departing from specification and accompanying drawing,
Should be within protection scope of the present invention.
Claims (10)
1. a kind of detecting system of panel surface defect, the detecting system includes being arranged on the area array cameras above display panel to be detected and the optical system set around area array cameras and the graphics processing unit being connected with area array cameras, the optical system source of parallel light component and mechanical structure, source of parallel light component is using the camera lens of area array cameras as absolute center, and around camera lens, it is configured with the vertical direction formation certain degree of camera lens, the incident light of source of parallel light component is irradiated on display panel to be detected, so that surface defect is reflected into the area array cameras camera lens above display panel to be measured, so as to detect surface defect.
2. detecting system as claimed in claim 1, wherein, the special angle refers to the angular range of the incident light of source of parallel light component and the vertical direction of area array cameras camera lens at 20 degree to 30 degree, it is preferred that 23-28 degree, the angle of incident light changes, that is, changes the method for light-source angle, with universal list way in industry, it can use in the different prism of light source arranged beneath to realize, or control the angle of light source to realize using electrical means.
3. detecting system as claimed in claim 1, although the claims below is the machine vision intelligible general knowledge of domain engineer in the industry, in order to realize the special angle and defect detection effect of right 2, illustrates the content of right 3 to 10 herein.Wherein, along the vertical direction of area array cameras, close to the left-right and front-back of camera lens, totally four light sources are first layer light source, and the horizontal range of itself and vertical direction is 15cm-20cm；Along the vertical direction of area array cameras below first layer light source left-right and front-back set totally four light sources be second layer light source, the horizontal range of itself and vertical direction is 20cm-30cm.
4. detecting system as claimed in claim 1, wherein, source of parallel light component is parallel area source and annular area source.
5. detecting system as claimed in claim 1, wherein, parallel area source is several symmetrically arranged parallel area sources around area array cameras camera lens.And using camera lens as absolute center, positional precision is less than 1mm.
6. detecting system as claimed in claim 1, wherein, surface defect is scuffing, concave point or breakage.
7. detecting system as claimed in claim 6, wherein, parallel area source is 4 symmetrically arranged parallel area sources.
8. the detecting system as described in claim any one of 1-7, wherein, the intensity of light source of parallel area source is in 500nit-5000nit.
9. the detecting system as described in claim any one of 1-7, wherein, the incident light of the light source is blue visible ray.
10. the detecting system as described in claim any one of 1-7, wherein, the display panel is LCD or OLED display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610169302.0A CN107228864A (en) | 2016-03-24 | 2016-03-24 | The detecting system of panel surface defect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610169302.0A CN107228864A (en) | 2016-03-24 | 2016-03-24 | The detecting system of panel surface defect |
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| CN107228864A true CN107228864A (en) | 2017-10-03 |
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| CN201610169302.0A Pending CN107228864A (en) | 2016-03-24 | 2016-03-24 | The detecting system of panel surface defect |
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Cited By (7)
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| CN108872251A (en) * | 2018-08-02 | 2018-11-23 | 北京兆维科技开发有限公司 | A kind of image acquisition mechanism and system of display screen |
| CN110261395A (en) * | 2019-06-28 | 2019-09-20 | 苏州精濑光电有限公司 | A kind of detection device |
| CN110398849A (en) * | 2019-07-31 | 2019-11-01 | 北京兆维电子(集团)有限责任公司 | A kind of liquid crystal display Systems for optical inspection |
| CN110987954A (en) * | 2019-12-30 | 2020-04-10 | 江南大学 | Method and system for eliminating leather surface defect detection blind area |
| CN113390896A (en) * | 2021-05-14 | 2021-09-14 | 北京兆维智能装备有限公司 | Defect detection device and method for large-format miniLED panel |
| CN114018934A (en) * | 2021-11-03 | 2022-02-08 | 四川启睿克科技有限公司 | Imaging system for detecting surface defects of arc-shaped metal |
| CN114235847A (en) * | 2021-12-20 | 2022-03-25 | 深圳市尊绅投资有限公司 | Liquid crystal display panel glass substrate surface defect detection device and detection method |
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