CN110262092A - A kind of liquid crystal display detection method based on NI Vision Builder for Automated Inspection - Google Patents
A kind of liquid crystal display detection method based on NI Vision Builder for Automated Inspection Download PDFInfo
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- CN110262092A CN110262092A CN201910345272.8A CN201910345272A CN110262092A CN 110262092 A CN110262092 A CN 110262092A CN 201910345272 A CN201910345272 A CN 201910345272A CN 110262092 A CN110262092 A CN 110262092A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 189
- 238000001514 detection method Methods 0.000 title claims abstract description 76
- 238000007689 inspection Methods 0.000 title claims abstract description 43
- 230000007547 defect Effects 0.000 claims abstract description 42
- 230000003287 optical effect Effects 0.000 claims description 31
- 238000003384 imaging method Methods 0.000 claims description 15
- 238000005286 illumination Methods 0.000 claims description 7
- 230000000007 visual effect Effects 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
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- 238000000034 method Methods 0.000 abstract description 8
- 238000012790 confirmation Methods 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
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- 208000037656 Respiratory Sounds Diseases 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
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- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
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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
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Abstract
The liquid crystal display detection method based on NI Vision Builder for Automated Inspection that the present invention relates to a kind of, NI Vision Builder for Automated Inspection are set in darkroom, comprising: the first and second image acquisition units face image for clapping；Third image acquisition units, for clapping side elevation image；For illuminating the lighting module of liquid crystal display；For method comprising steps of liquid crystal display is powered off, unlatching lighting module, the first image acquisition units clap to obtain Preliminary detection image；Liquid crystal display is powered, lighting module is closed, control liquid crystal display shows grey screen, and the first image acquisition units clap to obtain the first image, and the second image acquisition units clap to obtain the second image, and the bat of third image acquisition units takes third image；Liquid crystal display is powered, lighting module is closed, control liquid crystal display successively shows the different sprites of non-grey, and the first image acquisition units clap to obtain monochromatic detection image；According to open defect, point line defect and the Mura defects of Preliminary detection image, the first image, the second image, third image and monochromatic detection image confirmation liquid crystal display.
Description
Technical field
The present invention relates to industrial detection technical field more particularly to a kind of liquid crystal display detection sides based on NI Vision Builder for Automated Inspection
Method.
Background technique
With the improvement of living standards, consumable electronic product applies more and more extensive, and liquid in people's daily life
Crystalline substance screen plays an important role in consumer electronics, and the occasion of display, feedback or human-computer interaction is being needed to require liquid crystal display
It is realized to cooperate.
Since the production technology of liquid crystal display is complicated, process is much, and links are all likely to occur flaw, therefore, liquid crystal display
Detection become product yield control important means.Wherein, liquid crystal display defects detection generally includes open defect detection, point
Line defect detection and Mura defects detection etc., wherein open defect detection refer to detection liquid crystal display on whether has bubble, scuffing,
Chipping etc.；Dotted line defects detection refers on detection liquid crystal display whether there is bright spot, dim spot, bright line, concealed wire etc.；Mura refers to display
Brightness irregularities cause the phenomenon that various traces.
Traditional liquid crystal display detection operation, which generallys use, manually to be examined in the way of the defect for visually observing liquid crystal display
It surveys, human cost is high, and is difficult to ensure the consistency of testing result.Therefore, it is substituted using NI Vision Builder for Automated Inspection artificial
Detection, becomes the hot research direction of field of industry detection.
However, current NI Vision Builder for Automated Inspection is when carrying out liquid crystal display detection, often there is more serious missing inspection and
The problems such as crossing inspection, detection effect are difficult to satisfactory.
Summary of the invention
The liquid crystal display detection method based on NI Vision Builder for Automated Inspection that the embodiment of the invention provides a kind of, it is intended to solve existing machine
The problems such as serious missing inspection existing for device vision system is with inspection is crossed promotes the accuracy of liquid crystal display detection.
A kind of liquid crystal display detection method based on NI Vision Builder for Automated Inspection, the NI Vision Builder for Automated Inspection are arranged in darkroom,
Include: the first image acquisition units, optical axis are vertical with liquid crystal display to be measured；It is arranged in the first image acquisition unit side
Second image acquisition units at place, optical axis are vertical with liquid crystal display to be measured；Third image acquisition units, optical axis and liquid crystal to be measured
Shield outside at an acute angle and its visual field that the first image acquisition unit and second image acquisition units are set；For to
The lighting module of liquid crystal display illumination is surveyed, is arranged in the first image acquisition unit, second image acquisition units and institute
Outside the visual field for stating third image acquisition units；The method comprising the steps of: liquid crystal display to be measured is powered off, the lighting module is opened,
Liquid crystal display to be measured is shot using the first image acquisition unit, obtains Preliminary detection image；Liquid crystal display to be measured is powered, is closed
The lighting module, controls liquid crystal screen to be measured and shows grey screen, shoots liquid crystal to be measured using the first image acquisition unit
Screen obtains the first image；And liquid crystal display to be measured is shot using second image acquisition units, obtain the second image；With
And liquid crystal display to be measured is shot using the third image acquisition units, obtain third image；Liquid crystal display to be measured is powered, is closed
The lighting module is controlled the different sprites that liquid crystal display to be measured successively shows non-grey, is acquired using the first image
Unit photographs liquid crystal display to be measured obtains monochromatic detection image respectively；According to the Preliminary detection image, the first image, the second figure
Picture, third image and monochromatic detection image confirm the open defect, point line defect and Mura defects of liquid crystal display to be measured.
It in some specific embodiments, is powered off by liquid crystal display to be measured, opens the lighting module, utilize described first
Image acquisition units shoot liquid crystal display to be measured, and before obtaining Preliminary detection image, liquid crystal display to be measured and institute are determined by demarcating
State the pixel ratio of the first image acquisition units.
It in some specific embodiments, is powered off by liquid crystal display to be measured, opens the lighting module, utilize described first
Image acquisition units shoot liquid crystal display to be measured, before obtaining Preliminary detection image, by demarcating to the second Image Acquisition list
The first and described third image acquisition units carry out distortion correction.
In some specific embodiments, the difference sprites include white picture, red picture, green picture,
Blue picture and black picture.
In some specific embodiments, the optical axis of the first image acquisition unit is directed at the center of liquid crystal display to be measured.
Further, second image acquisition units to be additionally provided on the imaging optical path of liquid crystal display to be measured for make to
Liquid crystal display is surveyed in the centrally located adjustment microscope group of imaging of second image acquisition units.
Further, the adjustment microscope group includes a Dove prism, close second image on the Dove prism
The side plane of acquisition unit is coated with reflectance coating, and the side plane of close the first image acquisition unit is coated on the Dove prism
Semi-transparent semi-reflecting film.
Further, visible light anti-reflection film is coated on the end face of liquid crystal display to be measured on the Dove prism.
In some specific embodiments, the adjustment microscope group includes one first reflecting mirror and a semi-transparent half anti-filter light
Piece, first reflecting mirror are oppositely arranged with second image acquisition units, the semi-transparent semi-reflecting optical filter and described first
Image acquisition units are oppositely arranged, and first reflecting mirror is oppositely arranged in parallel with the semi-transparent semi-reflecting optical filter.
In some specific embodiments, the NI Vision Builder for Automated Inspection further includes having one second reflecting mirror, and described second is anti-
It penetrates mirror to be set at a side of the liquid crystal display to be measured far from the third image acquisition units, liquid crystal display to be measured is anti-described second
The imaging penetrated in mirror is located within the coverage of the third image acquisition units.
The present invention has following advantageous effects compared with the prior art:
In the present invention, the first image acquisition units shoot the image of facing of liquid crystal display to be measured, the Preliminary detection figure of shooting
It include the distribution for the dust that can be removed as having the various open defect information of liquid crystal display to be measured, in open defect information, and
Removable dust is not intended as defect and treats, the first image of the subsequent shooting of the first image acquisition units and monochromatic detection image
With liquid crystal display to be measured in the information of its point line defect under showing various colors, it is distributed in conjunction with the dust of Preliminary detection image,
It can be examined in elimination point line defect because being crossed caused by dust.The second image and third image of second image acquisition units shooting
The third image of acquisition unit shooting is that can capture each visual angle well to the multi-view image of liquid crystal display to be measured
Mura, dotted line defect information when then there is monochromatic detection image liquid crystal screen to be measured to show various colors picture, can be comprehensively
Detect various line defects on liquid crystal display to be measured, therefore the present invention can reduce the general of missing inspection generation when detecting liquid crystal display
Rate.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram for the NI Vision Builder for Automated Inspection that the first embodiment of the present invention provides；
Fig. 2 is the flow chart for the liquid crystal display detection method that the first embodiment of the present invention provides；
Fig. 3 is the structural schematic diagram for the NI Vision Builder for Automated Inspection that the second embodiment of the present invention provides；
Fig. 4 is the structural schematic diagram for the NI Vision Builder for Automated Inspection that the third embodiment of the present invention provides；
Fig. 5 is the structural schematic diagram for the NI Vision Builder for Automated Inspection that the fourth embodiment of the present invention provides；
Fig. 6 is the equivalent light path schematic diagram for the NI Vision Builder for Automated Inspection that the fourth embodiment of the present invention provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
It is also understood that mesh of the term used in this description of the invention merely for the sake of description specific embodiment
And be not intended to limit the present invention.As description of the invention and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise " one " of singular, "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in description of the invention and the appended claims is
Refer to any combination and all possible combinations of one or more of associated item listed, and including these combinations.?
In the explanation of the application, the orientation description of each component is for liquid crystal display to be detected is horizontal positioned.
Referring to Fig. 1, Fig. 1 is the NI Vision Builder for Automated Inspection for liquid crystal display detection that the first embodiment of the present invention provides
Structural schematic diagram.In this embodiment, which includes one first Image Acquisition list
First 2, one second image acquisition units 3, two third image acquisition units 4 and two lighting modules 5, wherein the first Image Acquisition list
Member 2 is oppositely arranged with liquid crystal display 1 to be measured, for shooting the first image of liquid crystal display 1 to be measured；The setting of second image acquisition units 3
At the side of the first image acquisition units 2 and the second image acquisition units 3 are oppositely arranged with liquid crystal display 1 to be measured, for shooting
Second image of liquid crystal display 1 to be measured；Two third image acquisition units 4 are oppositely arranged with liquid crystal display 1 to be measured and third Image Acquisition
The optical axis of unit 4 and the line face angle of 1 place plane of liquid crystal display to be measured are acute angle, and two third image acquisition units 4 are respectively used to
Shoot two side elevation images of liquid crystal display 1 to be measured；The light emitting region of two lighting modules 5 is directed at liquid crystal display 1 to be measured, for prepare liquid
1 illumination of crystalline substance screen.
Influence of the environment light to testing result in order to prevent, in detection process, NI Vision Builder for Automated Inspection and liquid crystal display to be measured are equal
In darkroom.
For guarantee image quality, the first image acquisition units 2 be a big target surface high resolution camera, as 29M, 47M, 50M,
91M and 122M camera can recognize sub-pix, wherein sub-pix refers to artificially in the definition of this patent by single pixel point
Multiple regions are segmented into, therefore pixel scale on liquid crystal display 1 to be measured can be readily recognized using the first image acquisition units 2
Defect.
In addition, the second image acquisition units 3 and third image acquisition units 4 are the CCD phase that pixel size is not less than 500,000
Machine or CMOS camera, thereby it is ensured that the various Mura defects on liquid crystal display 1 to be measured can not be taken with omitting.
In the present embodiment, lighting module 5 is strip-shaped light source, the light beam of lighting module 5 and 1 place plane of liquid crystal display to be measured
Line face corner dimension be chosen as 5 °~60 °, it is preferable that the line of the light beam of the lighting module 5 and 1 place plane of liquid crystal display to be measured
Face corner dimension is 8 °~30 °.The tilt angle of reasonable arrangement lighting module 5, both can guarantee that it was incident upon liquid crystal display 1 to be measured
On light it is uniform, and occupied space can be saved.
Referring to FIG. 2, the flow chart of the actually detected operation of the present embodiment, detection method step are as follows:
S100: control liquid crystal display shows matts picture, demarcates the pixel ratio of liquid crystal display and the first image acquisition units.
The screen for controlling liquid crystal display 1 to be measured, which is shown using PG (screen lights mould group), to be controlled.Liquid crystal display 1 to be measured shows cross
Can be used for judging the focusing situation of each image acquisition units when line drawing face, certainly it will be appreciated by those skilled in the art that for
The focusing of each image acquisition units, adoptable mode are not limited to this one kind above-mentioned.Liquid crystal display 1 to be measured is controlled to show
Matts picture, the first image acquisition units 2 shoot image, can be according to the image of shooting and the size ratio of liquid crystal display 1 to be measured
Example demarcates the pixel ratio of liquid crystal display 1 to be measured and the first image acquisition units 2.
S200: control liquid crystal display shows gridiron pattern picture, to the second image acquisition units and third image acquisition units into
Line distortion correction.
It controls liquid crystal display 1 to be measured and shows gridiron pattern picture, then it can be to the second image acquisition units 3 detected for Mura
Distortion correction is carried out with third image acquisition units 4, is conducive to the accuracy of Mura detection.
S300: liquid crystal display to be measured is powered off, and opens the lighting module, using the first image acquisition unit shooting to
Liquid crystal display is surveyed, Preliminary detection image is obtained.
Liquid crystal display 1 to be measured powers off, in darkroom, it is desirable to provide illumination, each image acquisition units can take liquid
The surface condition of crystalline substance screen 1, lighting module 5 provide illumination, and those skilled in the art are it should be understood that lighting module 5 should be
It is capable of providing the light source of uniform illumination.Preliminary detection image contains the various information of the open defect on 1 surface of liquid crystal display to be measured,
Such as scratch, bubble, flash, crackle and chipping etc. open defect, meanwhile, also have dust etc. can in Preliminary detection image
The distribution of foreign matter is removed, dust etc. is not belonging to picture element flaw, and can eliminate, if dust is confirmed as not in detection process
It is good, then it is assumed that be inspection.This method step plays an important role for excluding cubing, since the pattern of dust can identify, just
Step detection image can know that dust is distributed, the point with dust, then it is assumed that normal, specific strategy is that same point is simultaneously
The probability of happening for picture element flaw and dust occur is minimum, can be neglected.
S400: liquid crystal display to be measured is powered, and closes the lighting module, is controlled liquid crystal screen to be measured and is shown grey screen, benefit
Liquid crystal display to be measured is shot with the first image acquisition unit, obtains the first image；
And liquid crystal display to be measured is shot using second image acquisition units, obtain the second image；
And liquid crystal display to be measured is shot using the third image acquisition units, obtain third image.
It controls liquid crystal display 1 to be measured and shows grey screen, be specifically chosen L63 and L127 picture, the first image is for detecting L63
With the point line defect of L127 picture, for detecting Mura defects, the principle for detecting Mura defects is for the second image and third image
Determined whether according to the uniformity of image grayscale there are Mura defects, there are the region of Mura defects, area on corresponding image
Domain gray scale is abnormal.By experimental verification repeatedly, L63 and L127 picture is most appropriate to image grayscale uniformity meter after being shot
It calculates, and then detects the Mura defects on liquid crystal display 1 to be measured.
S500: liquid crystal display to be measured is powered, and closes the lighting module, and it is white, red, green to control liquid crystal screen display to be measured
Color, blue and black picture, shoot liquid crystal display to be measured using the first image acquisition unit, obtain monochromatic detection figure respectively
Picture.
Point line defect when being capable of detecting when that liquid crystal display 1 to be measured shows each sprite using monochromatic detection image,
In liquid crystal display 1 to be measured when showing black, the point line defect detected is exactly light leakage defect in fact.
S600: true according to the Preliminary detection image, the first image, the second image, third image and monochromatic detection image
Recognize the open defect, point line defect and Mura defects of liquid crystal display to be measured.
Completely obtain Preliminary detection image, the first image, the second image, third image and monochromatic detection image it
Afterwards, the judgement and positioning of various defects are carried out.The defect recognition decision technology specifically used is depth learning technology, using a large amount of
The neural network model that the training of defective products image pattern finishes, by each image acquisition units acquired image, namely it is preliminary
Detection image, the first image, the second image, third image and monochromatic detection image are as input, finally by neural network model
Export the testing result of liquid crystal display.
In this embodiment, refering to fig. 1, and the optical axis of the first image acquisition units 2 is directed at the center of liquid crystal display 1 to be measured,
In this way, image quality of the liquid crystal display 1 to be measured in the first image acquisition units 2 is optimal, what the first image acquisition units 2 took
The clarity of first image is best.In this embodiment, refering to fig. 1, liquid crystal display 1 to be measured is set on a horizontal plane, the first figure
As acquisition unit 2 is set at the surface of liquid crystal display 1 to be measured and the optical axis of the first image acquisition units 2 is directed at liquid crystal display to be measured
1 center.
Since the optical axis of the first image acquisition units 2 is directed at the center of liquid crystal display 1 to be measured, at this point, being set to the first image
The optical axis of the second image acquisition units 3 at the side of acquisition unit 2 will deviate from the center of liquid crystal display 1 to be measured.And when being imaged, it is
Make full use of the pixel of image acquisition units, need picture of the liquid crystal display 1 to be measured on image-forming module should as close as possible to center, for this purpose,
Refering to Fig. 3 and Fig. 4, the second image acquisition units 3, should to an adjustment microscope group is additionally provided on the imaging optical path of liquid crystal display 1 to be measured
For adjustment microscope group for making liquid crystal display 1 to be measured be located at center in the imaging of the second image acquisition units 3, such image quality is best,
The clarity of second image of captured liquid crystal display to be measured 1 is high, is more suitable for detection processing analysis.
Refering to Fig. 3, Fig. 3 is the one of the NI Vision Builder for Automated Inspection for liquid crystal display detection that the second embodiment of the present invention provides
Structural schematic diagram.In this embodiment, adjustment microscope group includes a Dove prism 6, and Dove prism 6 is adopted for reflecting the second image
Collect the imaging optical path of unit 3 so that liquid crystal display to be measured 1 is located at center, and Dove prism 6 in the imaging of the second image acquisition units 3
It is penetrated close to one end of the first image acquisition units 2 for the imaging optical path of the first image acquisition units 2.Specifically, trapezoidal rib
Side plane on mirror 6 close to the second image acquisition units 3 is coated with a reflectance coating, close first Image Acquisition list on Dove prism 6
The side plane of member 2 is coated with a semi-transparent semi-reflecting film.Normally, the transflection ratio of semi-transparent semi-reflecting film is 5:5 or 6:4 or 7:3.
In addition, in this embodiment, it is coated with an anti-reflection film on the end face of liquid crystal display to be measured on Dove prism 6, it is anti-reflection
Film makes the first image acquisition units 2 and the second image acquisition units 3 relatively sharp to the imaging of liquid crystal display 1 to be measured, is conducive to
Shooting.
In actual use, to avoid non-visible wavelength light in environment from entering the first image acquisition units 2, second
Shooting is impacted in image acquisition units 3 and third image acquisition units 4, normally, the first image acquisition units 2,
Be respectively required for additionally configuring visible filter on the camera lens of second image acquisition units 3 and third image acquisition units 4, so with
The interference of environment light is prevented, signal-to-noise ratio is improved.
Preferably, also a visible light-transmissive can be plated on that end face of liquid crystal display 1 to be measured on Dove prism 6
Film, the replaceable visible filter of visible light-transmissive film and realize stop non-visible wavelength light enter the first Image Acquisition
The purpose of unit 2 and the second image acquisition units 3, in this way, the mirror of the first image acquisition units 2 and the second image acquisition units 3
It is not necessary that visible filter is respectively configured on head, cost is advantageously reduced.
Referring to Fig. 4, Fig. 4 is the NI Vision Builder for Automated Inspection for liquid crystal display detection that the third embodiment of the present invention provides
One structural schematic diagram.In this embodiment, adjustment microscope group includes one first reflecting mirror 7 and a semi-transparent half anti-filter mating plate 8, and first
Reflecting mirror 7 is set at the underface of the camera lens of the second image acquisition units 3, and semi-transparent semi-reflecting optical filter 8 is set to the first image
At the underface of the camera lens of acquisition unit 2, liquid crystal display 1 to be measured successively passes through the two of semi-transparent semi-reflecting optical filter 8 and the first reflecting mirror 7
It is shot after secondary imaging by the second image acquisition units 3, meanwhile, liquid crystal display 1 to be measured can also be directed through semi-transparent semi-reflecting optical filter 8
It is shot by the first image acquisition units 2.In this embodiment, by the cooperation of the first reflecting mirror 7 and semi-transparent semi-reflecting optical filter 8 so that
Liquid crystal display 1 to be measured is located at center in the imaging of the second image acquisition units 3, in this way, the second of the shooting of the second image acquisition units 3
Image satisfies the use demand.Structure in Fig. 4 can reach similar technical effect with the structure in Fig. 3.
Preferably, a visible filter can be set at a side of the semi-transparent semi-reflecting optical filter 8 close to liquid crystal display to be measured,
To stop all light in addition to visible light wave range to enter the first image acquisition units 2 and the second image acquisition units 3, to drop
Low image noise, in this way, can without being respectively set one on the camera lens of the first image acquisition units 2 and the second image acquisition units 3
Light-exposed optical filter, advantageously reduces cost.
In this embodiment, the depth of field of two third image acquisition units 4 preferably covers the left and right two of liquid crystal display 1 to be measured
Side, so so as to the side elevation image of shooting clear.
Preferably, in each embodiment above-mentioned, which is pair with liquid crystal display 1 to be measured
Claim axial symmetry.And in some other embodiment, if this is used to be provided with multiple the in the NI Vision Builder for Automated Inspection of liquid crystal display detection
When three image acquisition units 4, third image acquisition units 4 can be centered on liquid crystal display 1 to be measured around setting.Art technology
Personnel, which should be understood that, aforementioned multiple third image acquisition units 4 is arranged in NI Vision Builder for Automated Inspection still to be wanted in this patent right
In the protection scope asked.
For the defect of complete detection liquid crystal display 1 to be measured, it is provided with certainly in each angle direction of liquid crystal display 1 to be measured
One third image acquisition units 4 are optimal to be used to shoot the side elevation image in the different angle direction for obtaining liquid crystal display 1 to be measured
Scheme, for example, there are two third Image Acquisition for setting at the upper side of liquid crystal display 1 to be measured in first embodiment shown in Fig. 1
Unit 4.Normally, the quantity Matching of the quantity of the side elevation image of captured acquisition and third image acquisition units 4 needs more
It generally requires to configure multiple third image acquisition units 4 when the side elevation image of a angle direction and be shot, still, industrial camera
Costly, configured in this way the cost is relatively high for price.But considering cost and effect, it is desirable to use less third image
More side elevation image is obtained on the basis of acquisition unit 4.Refering to Fig. 5, Fig. 5 is used for for what the fourth embodiment of the present invention provided
One structural schematic diagram of the NI Vision Builder for Automated Inspection of liquid crystal display detection.In this embodiment, it is arranged at the oblique upper of liquid crystal display 1 to be measured
There are a third image acquisition units 4, liquid crystal display 1 to be measured is far from being additionally provided with one at a side of third image acquisition units 4
A second reflecting mirror 9, imaging and to be measured liquid crystal display 1 of the liquid crystal display 1 to be measured in the second reflecting mirror 9 are respectively positioned on third figure in itself
As acquisition unit 4 coverage within.
When shooting, refering to Fig. 5, those of ordinary skill in the art will appreciate that ground, liquid crystal display 1 to be measured is in the second reflecting mirror 9
Middle first virtual image 1 ' for forming liquid crystal display 1 to be measured, in this way, third image acquisition units 4 can be taken by the second reflecting mirror 9
The side elevation image of side angle direction of the liquid crystal display 1 to be measured far from third image acquisition units 4, at the same time, third image is adopted
Collection unit 4 can also directly shoot liquid crystal display 1 to be measured close to the side elevation image of the side angle direction of third image acquisition units 4,
In this way, a third image acquisition units 4 are only arranged at the oblique upper of liquid crystal display 1 to be measured can shoot in liquid crystal display 1 to be measured
The side elevation image in two different angle directions, two side elevation image can be used for the side view Mura detection of liquid crystal display 1 to be measured.
It is another to understand ground, referring to Fig. 6, Fig. 6 is used for what liquid crystal display detected for what the fourth embodiment of the present invention provided
The equivalent light path schematic diagram of the one of NI Vision Builder for Automated Inspection, when shooting, third image acquisition units 4 form in the second reflecting mirror 9
The visual field of first virtual image 4 ' of three image acquisition units 4, first virtual image 4 ' covers liquid crystal display 1 to be measured, can so shoot to be measured
The side elevation image of side angle direction of the liquid crystal display 1 far from third image acquisition units 4, at the same time, third Image Acquisition list
Member 4 can also directly shoot liquid crystal display 1 to be measured close to the side elevation image of the side angle direction of third image acquisition units 4, in this way,
A third image acquisition units 4 are only arranged at the oblique upper of liquid crystal display 1 to be measured can shoot in liquid crystal display 1 to be measured two not
With the side elevation image of angle direction, which can be used for the side view Mura detection of liquid crystal display 1 to be measured.
Preferably, the corner dimension of the mirror surface of the second reflecting mirror 9 and liquid crystal display 1 to be measured is 90 °.
In this application, the line face corner dimension of the optical axis of third image acquisition units 4 and 1 place plane of liquid crystal display to be measured
It is 15 °~75 °.Preferably, the line face corner dimension of the optical axis of third image acquisition units 4 and 1 place plane of liquid crystal display to be measured
It is 30 °~60 °.
In this application, lighting module 5 can be single optical source system, lighting module 5 can also be multiple light courcess system, such as three or
Person four is even more than light source, and lighting module 5 can be the light source of strip source, sphere shape light or other shapes, shine
Bright area need to usually be greater than liquid crystal display 1 to be measured, and preferably light source maintaining uniform illumination region can cover 1 region of liquid crystal display to be measured.
In embodiment provided by the present invention, disclosed device may be implemented in other ways.More than for example,
Described Installation practice is only schematical.For example, equivalent component or device reality can be used in certain components or device
It is existing, but this realization is it is not considered that beyond the scope of the present invention.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (10)
1. a kind of liquid crystal display detection method based on NI Vision Builder for Automated Inspection, the NI Vision Builder for Automated Inspection is arranged in darkroom, packet
Included: the first image acquisition units, optical axis are vertical with liquid crystal display to be measured；It is arranged at the first image acquisition unit side
The second image acquisition units, optical axis is vertical with liquid crystal display to be measured；Third image acquisition units, optical axis and liquid crystal display to be measured
Outside at an acute angle and its visual field that the first image acquisition unit and second image acquisition units are set；For to be measured
The lighting module of liquid crystal display illumination, setting is in the first image acquisition unit, second image acquisition units and described
Outside the visual field of third image acquisition units；It is characterized in that, comprising steps of
Liquid crystal display to be measured is powered off, the lighting module is opened, shoots liquid crystal display to be measured using the first image acquisition unit,
Obtain Preliminary detection image；
Liquid crystal display to be measured is powered, the lighting module is closed, liquid crystal screen to be measured is controlled and shows grey screen, utilize described first
Image acquisition units shoot liquid crystal display to be measured, obtain the first image；
And liquid crystal display to be measured is shot using second image acquisition units, obtain the second image；
And liquid crystal display to be measured is shot using the third image acquisition units, obtain third image；
Liquid crystal display to be measured is powered, the lighting module is closed, liquid crystal display to be measured is controlled and successively shows that the difference of non-grey is monochromatic
Picture, shoots liquid crystal display to be measured using the first image acquisition unit, obtains monochromatic detection image respectively；
Liquid crystal to be measured is confirmed according to the Preliminary detection image, the first image, the second image, third image and monochromatic detection image
Open defect, point line defect and the Mura defects of screen.
2. the liquid crystal display detection method according to claim 1 based on NI Vision Builder for Automated Inspection, which is characterized in that will be to be measured
Liquid crystal display power-off, opens the lighting module, shoots liquid crystal display to be measured using the first image acquisition unit, obtains preliminary inspection
Before altimetric image, the pixel ratio of liquid crystal display to be measured and the first image acquisition unit is determined by demarcating.
3. the liquid crystal display detection method according to claim 1 based on NI Vision Builder for Automated Inspection, which is characterized in that will be to be measured
Liquid crystal display power-off, opens the lighting module, shoots liquid crystal display to be measured using the first image acquisition unit, obtains preliminary inspection
Before altimetric image, distortion correction is carried out to second image acquisition units and the third image acquisition units by calibration.
4. the liquid crystal display detection method according to claim 1 based on NI Vision Builder for Automated Inspection, which is characterized in that the difference
Sprite includes white picture, red picture, green picture, blue picture and black picture.
5. the liquid crystal display detection method described according to claim 1-any one of 4 based on NI Vision Builder for Automated Inspection, feature
It is, the optical axis of the first image acquisition unit is directed at the center of liquid crystal display to be measured.
6. the liquid crystal display detection method according to claim 5 based on NI Vision Builder for Automated Inspection, which is characterized in that described second
Image acquisition units on the imaging optical path of liquid crystal display to be measured to being additionally provided with for adopting liquid crystal display to be measured in second image
Collect the centrally located adjustment microscope group of imaging of unit.
7. the liquid crystal display detection method according to claim 6 based on NI Vision Builder for Automated Inspection, which is characterized in that the adjustment
Microscope group includes a Dove prism, and the side plane of close second image acquisition units is coated with reflection on the Dove prism
Film, the side plane on the Dove prism close to the first image acquisition unit are coated with semi-transparent semi-reflecting film.
8. the liquid crystal display detection method according to claim 7 based on NI Vision Builder for Automated Inspection, which is characterized in that described trapezoidal
Visible light anti-reflection film is coated on the end face of liquid crystal display to be measured on prism.
9. the liquid crystal display detection method according to claim 6 based on NI Vision Builder for Automated Inspection, which is characterized in that the adjustment
Microscope group includes one first reflecting mirror and a semi-transparent half anti-filter mating plate, first reflecting mirror and second image acquisition units
It is oppositely arranged, the semi-transparent semi-reflecting optical filter is oppositely arranged with the first image acquisition unit, first reflecting mirror and institute
Semi-transparent semi-reflecting optical filter is stated to be oppositely arranged in parallel.
10. the liquid crystal display detection method according to claim 1 based on NI Vision Builder for Automated Inspection, which is characterized in that the machine
Device vision system further includes having one second reflecting mirror, and second reflecting mirror is set to liquid crystal display to be measured far from the third image
At one side of acquisition unit, imaging of the liquid crystal display to be measured in second reflecting mirror is located at the third image acquisition units
Coverage within.
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| CN112964642A (en) * | 2021-04-21 | 2021-06-15 | 广东速美达自动化股份有限公司 | Method and system for detecting foreign matters in liquid crystal display based on binocular stereo reconstruction |
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