CN101076720B - Apparatus for inspecting backlight unit - Google Patents
Apparatus for inspecting backlight unit Download PDFInfo
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- CN101076720B CN101076720B CN200580042527XA CN200580042527A CN101076720B CN 101076720 B CN101076720 B CN 101076720B CN 200580042527X A CN200580042527X A CN 200580042527XA CN 200580042527 A CN200580042527 A CN 200580042527A CN 101076720 B CN101076720 B CN 101076720B
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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
- G01N21/8806—Specially adapted optical and illumination features
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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
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0966—Cylindrical lenses
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07G—REGISTERING THE RECEIPT OF CASH, VALUABLES, OR TOKENS
- G07G1/00—Cash registers
- G07G1/0036—Checkout procedures
- G07G1/0045—Checkout procedures with a code reader for reading of an identifying code of the article to be registered, e.g. barcode reader or radio-frequency identity [RFID] reader
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N2021/3181—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using LEDs
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/10—Scanning
- G01N2201/102—Video camera
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Abstract
An apparatus for inspecting a backlight unit is provided. A backlight unit is mounted on a mounting unit. A lighting unit irradiates uniform light, having such intensity to enter the backlight unit and to pass through films of the backlight unit through an optical path inside the backlight unit, to the backlight unit and allows the backlight unit to have a status corresponding to a lighted-up status. An image pickup unit takes a photograph of an inspection area on the surface of the backlight unit, which has the status corresponding to the lighted-up status by the light irradiated from the lighting unit, and acquires an inspection target image. An image processing unit detects a defect of the backlight unit on the basis of the inspection target image input from the image pickup unit.
Description
Technical field
The invention relates to a kind of device that is used to check back light unit, and more particular words it, be the testing fixture of defective that is used for the back light unit of an image display about a kind of Auto-Sensing.
Background technology
Back light unit (BLU) is the equipment that is positioned on the back side of liquid crystal panel and is used for projection light.Make back light unit by stacking a reflector plate, a light guide plate (light guide plate), a diffusion sheet (diffusingsheet), a prismatic lens (prism sheet), a screening glass (protective sheet) and analog thereof.Light from radiation of light source to back light unit is incident on the side of light guide plate or is incident between reflector plate and the diffusion sheet.Light-emittingdiode (LED) or cold-cathode fluorescence lamp (CCFL) can be used as light source.When there is defective in stacking of the back light unit with said structure in plate or the sheet, can destroy the uniformity of light that is projected to liquid crystal panel, cause the image quality deterioration by this.
The figure explanation of Figure 1A is used for the conventional devices of manual examination (check) back light unit and shows, and the flowchart text of Figure 1B is by the inspection back light unit process of using conventional devices manual examination (check) back light unit.
Referring to Figure 1A and 1B, when via conveyor 110 back light unit 130 being delivered to the workplace (S100) of wherein locating a controller, controller is connected to back light unit 130 power supply device 120 (S110) and lights back light unit 130 (S120).Herein, power supply device 120 comprises a power supply and a phase inverter.Then, controller is carried out a visual examination (S130).When finishing visual examination, controller puts out back light unit 130 (S140) and separates back light unit 130 (S150) from power supply device 120.
The figure explanation of Fig. 2 A is used for the conventional devices of self-verifying back light unit, the flowchart text of Fig. 2 B is by the inspection back light unit process of using conventional devices self-verifying back light unit, and the schematic view illustrating of Fig. 2 C is used for the conventional devices of self-verifying back light unit.
Referring to Fig. 2 A to 2C, when via conveyor 210 back light unit 230-2 being delivered to the workplace (S200) of wherein locating a controller, controller back light unit 230-2 is provided the power supply device 220 that is provided in the conveyor 210 and lights back light unit 230-2 (S210).The filming image zone (imagepickup area) that the back light unit 230-2 that will be lighted via conveyor 210 is delivered to camera 240 (S220).Camera 240 is taken the quilt that enters in the filming image zone and is lighted the photograph of back light unit 230-2 and obtain one image (S230).Image processing system 250 is handled the captured image of camera 240 and the defective (S240) of detecting back light unit.When finishing the defect detection process, controller puts out back light unit 230-2 and separates back light unit 230-2 (S250) from power supply device 220.
The robotization of detecting defective is being used for checking that the conventional devices of back light unit is for feasible.Yet the process that back light unit is connected to automatically power supply device is extremely difficult.Correspondingly, only can manually carry out in the work of checking and before power supply device separates back light unit, back light unit is connected to power supply device by controller.In addition, be used to check that the conventional devices needs one of back light unit are at the special device of lighting mobile back light unit under the situation of back light unit.Yet, on conveyor, carry the required power supply device of back light unit to have complex structure and the high problem of cost lighting under the situation of back light unit.In addition, this power supply device has the problem that should wholely replace existing inspection line.Even these problems make that being difficult to robotization checks the device of back light unit and finished robotization, also can reduce the advantage of robotization.
On the other hand, after lighting back light unit, the variation that can not cause the brightness of visual examination problem of back light unit causes the problem of the back light unit that self-verifying is lighted. back light unit has full brightness when lighting after the back light unit about 20 seconds, and human eye can detect defective when initiatively adjusting the brightness variation. be different from this, having the automatic checking device of camera can be only reach full brightness or minimumly obtains effective image when lightness stabilized when brightness. correspondingly, in the self-verifying back light unit shown in Fig. 2 A, after lighting back light unit before the image of taking back light unit, conventional devices should be waited for about 10 to 20 seconds, has significantly reduced the advantage of robotization by this.
Other aspects when kind that changes back light unit or type, can correspondingly change the structure of the capacity or the connector of phase inverter.Therefore, be the type change of reply, should change and be used for shown in Fig. 2 A checking that the conventional devices of back light unit comprises the entity structure of the system of mechanical conceptual, or answer the work of reseting of executive system as the back light unit of checking target.
In the device of known up to now self-verifying back light unit, visual examination replaced with the phase machine check and need not to solve above-mentioned basic problem in the robotization, and under the situation of manually lighting back light unit, still there is the problem that to wait for the schedule time, therefore do not obtain enough robotization advantages.
Under the situation that back light unit is lighted, in the above-mentioned automatic checking device of detecting defective, make that for consideration the advantage of robotization is quite few to cost.Therefore, need be used at the device of not lighting inspection back light unit under the situation of back light unit.Yet owing to the textural difference of object, the device (such as the liquid crystal panel testing fixture) that need not to light this inspection target by using indirect illumination to check target can not be used to check back light unit.
The known liquid crystal panel testing fixture of figure explanation in a reflective illumination system (reflective lighting system) of Fig. 3.
Referring to Fig. 3, use the known liquid crystal panel testing fixture 300 of reflective illumination system to comprise light source 320, camera 330 and image processing arrangement 340.Light source 320 is positioned at the positive top of checking target 310 and is used for optical radiation to checking target 310.Camera 330 is captured and is checked the light that target 310 is reflected and take its image.Image processing arrangement 340 is handled camera 330 captured images and is also detected the defective of checking target 310.
Use the above-mentioned known liquid crystal panel testing fixture 300 of reflective illumination system only can detect inspection target 310 lip-deep External Defects and can not detect inherent vice.In addition, because emission from light self-check target 310 reflection of light source 320 and to be incident to the dust that exists in the optical path on the camera 330 be dense and give prominence to, therefore is difficult to accurately detect defective in the captured image of the camera 330 of being everlasting.In addition, have under the situation of transmission property in inspection target such as liquid crystal panel, can use a transmission illumination system that wherein has a light source to be positioned to check on the back side of target, but because back light unit is not for having the inspection target of transmission property, so rear transmission illumination system (rear transmissivelighting system) can not be used for back light unit.
Summary of the invention
The present invention is to address the above problem in design.A purpose of the present invention is for providing the device of checking back light unit, wherein can check this back light unit and need not via a phase inverter this back light unit to be connected to a power supply.
According to an aspect of the present invention, the device of an inspection back light unit is provided, this device comprises: an installation unit, a back light unit is installed on it; Be disposed at the lighting unit of aforementioned back light unit outside, the even light of its radiation, this even light has and enters this back light unit and pass a film of this back light unit and the intensity of this back light unit that arrives via the optical path in this back light unit, and this lighting unit allows this back light unit to have a state corresponding to illuminating state; One filming image unit, it takes the photo of a lip-deep inspection area of this back light unit, wherein this inspection area has corresponding to by the state of radiation from the illuminating state that light caused of lighting unit, and this filming image unit obtains one and checks target image; And an image process unit, it detects a defective of this back light unit from the inspection target image of this filming image unit based on input.
Description of drawings
By referring to appended graphic detailed description exemplary embodiments of the present invention, above-mentioned and other feature of the present invention and advantage can become apparent, wherein:
Figure 1A figure illustrates the conventional devices of manual examination (check) back light unit.
The flowchart text of Figure 1B is by the inspection back light unit process of using conventional devices manual examination (check) back light unit.
The figure of Fig. 2 A illustrates the conventional devices of self-verifying back light unit.
The flowchart text of Fig. 2 B is by the inspection back light unit process of using conventional devices self-verifying back light unit.
The conventional devices of the schematic view illustrating self-verifying back light unit of Fig. 2 C.
The figure of Fig. 3 illustrates the conventional devices of the inspection back light unit that uses reflective illumination system.
The figure explanation of Fig. 4 is according to the device of the inspection back light unit of exemplary embodiments of the present invention.
The figure of Fig. 5 A and 5B illustrates the structure of back light unit.
The figure of Fig. 6 illustrates that emission diffuses to according to the situation in the back light unit in the device of inspection back light unit of the present invention via an optical path from the light of light source.
The figure explanation of Fig. 7 directly is incident on the camera from the surround or is reflected and then be incident in the optical path of the parasitic light on the camera by back light unit, and this parasitic light is as an obstacle of checking back light unit.
The figure of Fig. 8 illustrates the device of checking back light unit, wherein provides light shielding film to show the effect identical with the light with rectilinear propagation character with the light that allows to have scattering nature.
The device of the back light unit with linear camera (linearcamera) is checked in the figure explanation of Fig. 9 according to an embodiment of the invention.
The device of the back light unit with an illumination is checked in the figure explanation of Figure 10 according to an embodiment of the invention.
The figure explanation of Figure 11 A has the production line according to the device of inspection back light unit of the present invention.
The flowchart text of Figure 11 B has according to the checking process in the production line of the device of inspection back light unit of the present invention.
The figure of Figure 12 illustrates the device of checking back light unit, and wherein the classification of visual back light unit is regulated the light intensity of radiation from light source.
The figure of Figure 13 A and 13B illustrates the image of the back light unit that obtains by prior art method respectively, reaches the image of the back light unit that obtains by the method according to this invention.
110: conveyor 120: power supply device
130: back light unit 210: conveyor
220: power supply device 230-2: back light unit
240: camera 250: image processing system
300: liquid crystal panel testing fixture 310: check target
320: light source 330: camera
340: image processing arrangement 400: the device of checking back light unit
410: installation unit 420: lighting unit
430: filming image unit 440: image process unit
450: back light unit 610: light guide plate
810: light source 820: camera
830: light shielding film 900: the device of checking back light unit
910: shift platform/action platform 920: light source
930: linear camera 940: image process unit
950: back light unit 1010: light source
1020: camera 1030: the half reflection minute surface
1040: minute surface 1110: conveyor
1120: light source 1130: camera
1140: back light unit 1200: the device of checking back light unit
1210: installation unit 1220: lighting unit
1230: filming image unit 1240: image process unit
1250: light intensity regulon 1260: back light unit
Embodiment
Hereinafter, will describe exemplary embodiments of the present invention in detail referring to appended diagram.
The figure explanation of Fig. 4 is according to the device of the inspection back light unit of exemplary embodiments of the present invention.
Referring to Fig. 4, comprise installation unit 410, lighting unit 420, filming image unit 430 according to the device 400 of inspection back light unit of the present invention, and image process unit 440.
Back light unit 450 is installed on installation unit 410.The position mark of the back light unit 450 that should look the size of back light unit 450 and dispose is on installation unit 410, or the part of outstanding installation unit 410 is so that accurately locate back light unit 450.
The even light of lighting unit 420 emissions, this even light has the intensity that enters back light unit 450 and pass the film of back light unit 450 via the optical path in the back light unit 450.Correspondingly, lighting unit 420 comprises at least one light source.When light has better rectilinear propagation character, the distance when between the surface of light source and back light unit 450 more hour, and when the optical radiation circuit to back light unit 450 was more near perpendicular line from light source, light transmissioning efficiency was strengthened further.By the light that uses optical fiber or high-capacity LED can obtain to have good rectilinear propagation character.Perhaps, by a cylindrical lens or a spheric reflection sheet optionally are positioned in the optical path, can obtain to have the light of good rectilinear propagation character.By with external emission from the optical radiation of the good rectilinear propagation character of having of lighting unit 420 end face to back light unit 450, can allow back light unit 450 to have the state that is similar to illuminating state.Be disposed at lighting unit 420 around the filming image unit 430 and to the even light of back light unit 450 radiation.At this moment, can not form and make emission directly or via the reflection of back light unit 450 be incident in this kind optical path on the filming image unit 430 from the light of lighting unit 420.
Filming image unit 430 detecting emission from lighting unit 420, enter back light unit 450, pass most films that constitute back light unit 450 and then be emitted to back light unit 450 light in addition via the optical path back light unit 450 in, obtain an image of back light unit 450 by this.Filming image unit 430 comprises a camera, and it has the photo-electric conversion element (photoelectric transformation element) that the light that will be detected is converted to electric signal.
The defective that image process unit 440 is taken the image detecting back light unit 450 of unit 430 based on the input self imaging.Image process unit 440 calculates the average brightness value of input image.When the brightness value of dark space in the image during than the low predetermined reference value of average brightness value, image process unit 440 is judged in the relevant range of back light units 450 and is had defective or particle.Because those who familiarize themselves with the technology can understand the configuration and the operation of filming image unit 440, therefore omit its detailed description.
In above-mentioned device according to inspection back light unit of the present invention, the emission autogamy places the light of the light source of checking the target top to enter the inspection target internal, pass the optical path of checking in the target, and then be back to and check beyond the target. capture to be back to camera according to the device of inspection back light unit of the present invention and check the target light in addition and the defective of detecting back light unit. at this moment, need prevent that light from directly entering camera or entering camera after the back light unit reflection from light source. promptly, in the device of inspection back light unit according to the present invention, be different from the illuminator that is used to check back light unit in the conventional devices, light should be radiated to the inspection area (promptly, the filming image zone of camera) periphery. illuminator can be described as the place ahead transmission illumination system (front transmissive lighting system), make it can be different from known reflective illumination system and transmission illumination system (that is rear transmission illumination system).
The figure of Fig. 5 A and 5B illustrates the structure of back light unit.Referring to Fig. 5 A and 5B, can roughly back light unit be divided into two classes.One class has the back light unit of light source for the side shown in 5A.Under this kind situation, the emission autogamy places the light of the light source of side to diffuse on the whole surface of back light unit via light guide plate, passes such as the diffusion sheet that is disposed at light guide plate top and the optical sheet of prismatic lens, and then returns from the end face of back light unit once more.The another kind of back light unit that has light source for the bottom surface shown in Fig. 5 B.Under this kind situation, the emission autogamy places the light of the light source on the bottom surface to diffuse on the whole surface of back light unit via reflector plate and diffusion sheet, passes such as the optical sheet that is disposed at the prism on the diffusion sheet, and then returns from the end face of back light unit once more.
The figure of Fig. 6 illustrates that emission is from according to the light transmission of the light source of the device of inspection back light unit of the present invention optical path to the back light unit.
Referring to Fig. 6, emission arrives light guide plate 610 from the even and strong light of light source, via light guide plate 610 diffusions, and then returns end face once more.Correspondingly, back light unit has a luminance that is similar to the illuminating state of back light unit.
On the other hand, when light from light source directly be incident on the camera or be incident in after by the back light unit reflection on the camera optical path with from light source when the optical path of checking target forms, can not clear demonstration particle thereby image is can be impaired feasible.Fig. 7 displaying does not expect that parasitic light (but not the light through launching) self-check target enters the situation of camera.That is, when having defective in the back light unit, the particle blocking reflected that exists in the back light unit shows corresponding dark space by this from the light of back light unit.Yet as shown in Figure 7, the parasitic light that enters camera after particle reflection or the scattering makes particle look brighter, has damaged the defect detection usefulness of testing fixture by this.Correspondingly, for implementing an effective system, should stop that light directly enters camera or enter the optical path of camera after by the reflection of back light unit or particle from light source.By the light source that use has good rectilinear propagation character, parasitic light can not arrive particle.Be different from the general illumination system, should be with the periphery of optical radiation to the examine target.
The light source that the method that Fig. 8 shows allows to have faint rectilinear propagation character or scattering nature shows the effect that is similar to the light source with stronger rectilinear propagation character.That is,, provide light shielding film (light-shieldingfilm) 830, can stop that parasitic light directly enters camera 820 or enter camera after by the back light unit reflection from light source 810 in a side by being arranged at camera 820 under the situation of light source 810 both sides.When use has the light source of stronger rectilinear propagation character, also can use this light shielding film 830, make to stop that parasitic light enters camera 820 after by the back light unit reflection.
When whole when surface that can not light back light unit owing to faint illumination equably, can be by using linear camera to obtain image effectively corresponding to illuminating state.Fig. 9 shows the device that uses linear camera to check back light unit.
Referring to Fig. 9, check that the device 900 of back light unit comprises transfer platform 910, light source 920, linear camera 930 and image process unit 940.
Back light unit 950. controls are installed on the platform 910 in action shift the translational speed of platform 910, be this speed that linear camera 930 can obtain the image of back light unit 950. configuration light source 920 on the both sides of linear camera 930, yet the end at back light unit 950 can not put out illumination by this., under this kind situation, owing to only will launch optical radiation from a light source 920 to back light unit 950 at the end of back light unit 950, yet the brightness that therefore enters the light of linear camera 930 is decreased to half., carry out equilibrium treatment by using image processing work, can be from terminal detecting defective. linear camera 930 is positioned at and shifts platform 910 tops and be used to supply the image that obtains by shooting back light unit 950, and wherein this back light unit 950 has the state of the illuminating state that is similar to image process unit 940. and image process unit 940 is handled this image and is detected a defective.
On the other hand, by light source and the high-intensity light that use has good homogeneity and rectilinear propagation character, can implement to check the device of back light unit by a light source.Figure 10 shows the device that only has a light source that is used to check back light unit.Because other elements of device shown in Figure 10 are similar to the element referring to Fig. 4 and 9 described devices, therefore the descriptions thereof are omitted.Referring to Figure 10, only on a side of camera 1020, dispose light source 1010.At this moment, half reflection minute surface (half mirror) 1030 is disposed at that light source 1010 belows and minute surface 1040 are disposed on the side of camera 1020 and is relative with light source 1010.The half reflection minute surface 1030 that is disposed at light source 1010 belows is towards the part of minute surface 1040 reflection emissions from the light of light source 1010, and wherein minute surface 1040 is disposed on the side of camera 1020 and relative with light source 1010.Correspondingly, can obtain to be disposed at the identical advantage of situation of camera 1020 both sides with the light source that will have stronger rectilinear propagation character.
The figure explanation of Figure 11 A has the production line according to the device of inspection back light unit of the present invention, and the checking process in the flowchart text production line of Figure 11 B.
Referring to Figure 11 A and 11B, will be positioned at back light unit 1140 on the conveyor 1110 by moving of conveyor 1110 and to be delivered to one and to check position (S1100).Light source 1120 is disposed at the upstream side and the downstream of camera 1130 along the throughput direction of back light unit 1140.Emission, is passed the optical path in the back light unit 1140, and then is emitted to beyond the back light unit 1140 to back light unit 1140 from the light transmission of light source 1120.Camera 1130 is taken the image (S1110) that is delivered to the back light unit 1140 of checking the position.Kind on camera 1130 is decided, and sets the translational speed of conveyor 1110 different.When camera 1130 was general optical camera, conveyor 1110 repeats this with the cycle corresponding to the filming image zone of camera 1130 to be stopped and carrying.When camera 1130 is linear camera, the speed control of conveyor 1110 can be obtained the speed place of an image of back light unit 1140 at linear camera 1130.Image process unit (not shown) is handled the captured image of camera 1130 and a defective (S1120) of detecting back light unit.According to the device and method of checking back light unit,, therefore can implement to be used for the on-line automatic checking process of back light unit owing to after need not manual work and lighting back light unit between introducing back light unit and the taking-up back light unit, need not the stand-by period.
On the other hand, should control the various factors that influences filming image, make the captured image of camera can keep enough even qualities, even also detect defective so that work as the kind time-like that changes as the back light unit of checking target.In influencing the various factors of filming image, the factor that influences image brilliance is even more important, such as the exposure and the analog thereof of light intensity, camera gain, lens stop.Concrete speech, the adjusting of light intensity is the most important, and it allows control image brilliance and can not influence other factors such as the depth of focus or image incidental information.
The figure of Figure 12 illustrates the device of checking back light unit, and wherein the kind of visual back light unit is regulated the light intensity of radiation from light source.
Referring to Figure 12, device 1200 according to inspection back light unit of the present invention comprises installation unit 1210, lighting unit 1220, filming image unit 1230, image process unit 1240, and light intensity regulon (light intensity adjusting unit) 1250, scalable light intensity in this device. light intensity regulon 1250 is based on the illumination value of the classification information of the back light unit of supplying corresponding to the outside 1260, adjusting is radiated to the light intensity of back light unit 1260 from lighting unit 1220, wherein this illumination value is among the illumination value of various back light units 1260. and the illumination value of various back light units 1260 is stored in the light intensity regulon 1250. and measure the illumination value of various back light units 1260 in advance and it is stored in the light intensity regulon 1250. for obtaining the illumination value of various back light units 1260, in the various factors of the quality of having determined to influence the captured image in filming image unit 1230 (camera gain for example, aperture exposure and analog thereof) situation under, carry out the image analysing computer of various back light units. promptly, the illumination value of back light unit 1260 is set at the illumination value that belongs to following scope, the mean flow rate that can determine image in this scope equates in the kind time-like that changes as the back light unit 1260 of checking target. lighting criteria value and test condition that form 1 is showed various back light units. and herein, the lighting criteria value is for regulating the adjuster value of illumination.
On the other hand, in influencing the factor of filming image except can simple and easy control light intensity, by changing other factors that influence filming image, can tackle the kind of back light unit 1260 and variation and the maintenance image brilliance and the similar homogeneity of type such as camera gain.Because therefore the structure of enabling this function of testing fixture 1200 and structure and the assignment procedure that assignment procedure is similar to the light intensity regulon described in the illumination adjustments example omit this description.
If change kind as the back light unit 1260 of checking target, then light intensity regulon 1250 is read illumination value that is stored in classification wherein and the illumination that changes lighting unit 1220 based on the illumination value of being read. check the classification information of the back light unit 1260 of target about conduct by the controller input. and other aspects, when when being used for checking that device 1200 as the back light unit of checking target provides one can obtain the fetch equipment of data from the information recording member (not shown) such as bar code and RFID (radio frequency identification sign indicating number), but all checking processes of robotization. herein, the device 1200 of checking back light unit 1260 obtains bar code, RFID and analog thereof, it is attached to as on the back light unit 1260 of checking target and its and records the classification information. according to this configuration, even when the classification that changes as the back light unit 1260 of checking target, but the also entity structure of minimization system 1200 or the variation of reseting, change that by this can simple and easy reply kind. because the element except light intensity regulon 1250 is similar to the related elements referring to the device of the described inspection back light unit of Fig. 4, therefore omit its detailed description.
The figure of Figure 13 A and 13B illustrates respectively by using prior art method to light the image of the back light unit of taking with camera under the situation of back light unit, and by using the method according to this invention to allow back light unit to have an image that is similar under the situation of illuminating state with the captured back light unit of camera.Shown in Figure 13 A and 13B, the image of taking according to the present invention almost is similar to is lighting image captured under the situation of back light unit.
In above-mentioned device,, therefore compare and to simplify automatic inspection system with conventional system owing to need not to light the defective that back light unit just can be checked back light unit according to inspection back light unit of the present invention.In addition, owing to need not manually the connector of back light unit to be connected to power supply via phase inverter, therefore can simple and easy enforcement production line.In addition, owing to need not to wait for for the back light unit of self-verifying to be the brightness transformation period of major limitation through lighting, and can simple and easy reply conduct check the type change of the back light unit of target, so further strengthened the robotization advantage of testing fixture.In addition, in the existing production line that automatic checking device can be introduced back light unit (comprising the conveyor line need not expensive), therefore can the online automatic checking device of simple and easy manufacturing.
Also can be the computer readable program sign indicating number on the computer-readable recording medium with the invention process.Computer-readable recording medium is arbitrary device for data storage, and it can store the data that after this reads by computer system.The example of computer-readable recording medium comprises the read only memory (ROM), random-access memory (ram), tight laser disc-read only memory, tape, soft dish, optical data storage equipment and carrier wave (such as the data transmission via world-wide web).Computer-readable recording medium also can be distributed on the network that couples computer system, make to store and carries out the computer readable program sign indicating number with dispersion pattern.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining.
Claims (11)
1. device of checking back light unit is characterized in that comprising:
One installation unit is installed a back light unit on it;
Be disposed at the lighting unit of aforementioned back light unit outside, the even light of its radiation, aforementioned even light has and enters aforementioned back light unit and pass a film of aforementioned back light unit and this intensity of the aforementioned back light unit that arrives via the optical path in the aforementioned back light unit, and aforementioned lighting unit allows aforementioned back light unit to have one corresponding to a state of lighting state;
One filming image unit, it takes the photograph in a lip-deep inspection area of aforementioned back light unit, aforementioned inspection area has corresponding to by the aforesaid state of radiation from the aforementioned illuminating state that light caused of aforementioned lighting unit, and aforementioned filming image unit obtains one and checks target image; And
One image process unit, it is based on a defective of being detected aforementioned back light unit by the aforementioned inspection target image of aforementioned filming image unit input.
2. the device of inspection back light unit as claimed in claim 1 is characterized in that wherein aforementioned lighting unit comprises:
One light source, it is disposed at a side of aforementioned filming image unit and it launches aforementioned even light, and aforementioned even light has this intensity that enters aforementioned back light unit and pass a film of aforementioned back light unit via the optical path in the aforementioned back light unit;
The part that one first minute surface, its part that is disposed at the aforementioned lights that aforementioned light source below and its will be launched by aforementioned light source transfer to aforementioned back light unit and reflect aforementioned lights is to change aforementioned optical path; And
One second minute surface, it changes the aforementioned optical path of the aforementioned lights that is reflected by aforementioned first minute surface, aforementioned lights is radiated to aforementioned back light unit.
3. the device of inspection back light unit as claimed in claim 1, it is characterized in that wherein aforementioned lighting unit comprises most light sources, it is disposed at the both sides of aforementioned filming image unit and it launches aforementioned even light, and aforementioned even light has this intensity that enters aforementioned back light unit and pass a film of aforementioned back light unit via the optical path in the aforementioned back light unit.
4. the device of inspection back light unit as claimed in claim 2, it is characterized in that wherein aforementioned lighting unit more comprises a light shielding film, it stops that light directly enters aforementioned filming image unit from aforementioned light source, and stops that parasitic light is from the reflection of aforementioned back light unit and enter aforementioned filming image unit.
5. the device of inspection back light unit as claimed in claim 1 is characterized in that wherein aforementioned lighting unit comprises:
One light source, it launches aforementioned even light, and aforementioned even light has this intensity that enters aforementioned back light unit and pass a film of aforementioned back light unit via the optical path in the aforementioned back light unit; And
One light shielding film, it stops that light directly enters aforementioned filming image unit from aforementioned light source, and hinders parasitic light from aforementioned back light unit reflection and enter aforementioned filming image unit.
6. the device of inspection back light unit as claimed in claim 1 is characterized in that wherein aforementioned installation unit is a delivery platform, and it is delivered to the aforementioned back light unit on it one filming image position of aforementioned filming image unit.
7. the device of inspection back light unit as claimed in claim 6 is characterized in that wherein aforementioned filming image unit is a linear camera, and it has a linear filming image zone perpendicular to the throughput direction of aforementioned back light unit.
8. the device of inspection back light unit as claimed in claim 7, it is characterized in that wherein aforementioned lighting unit comprises most light sources, it is disposed at two positions of the preset distance of being separated by before and after the aforementioned filming image zone with aforementioned linear camera along the aforementioned throughput direction of aforementioned back light unit, and described light emitted is parallel to the linear light in the aforementioned filming image zone of aforementioned linear camera.
9. the device of inspection back light unit as claimed in claim 7 is characterized in that wherein aforementioned lighting unit comprises:
One light source, it is along the aforementioned throughput direction of aforementioned back light unit and be disposed at a be separated by position of a preset distance, aforementioned filming image zone with aforementioned linear camera, and described light emitted is parallel to the linear light in the aforementioned filming image zone of aforementioned linear camera;
One first minute surface, it is disposed at aforementioned light source below and aforementioned first minute surface will launch the part that the part from the aforementioned lights of aforementioned light source transfers to aforementioned back light unit and reflects aforementioned lights, to change aforementioned optical path; And
One second minute surface, it changes the aforementioned optical path of reflection from the aforementioned lights of aforementioned first minute surface, aforementioned lights is radiated to aforementioned back light unit.
10. the device of inspection back light unit as claimed in claim 6, it is characterized in that wherein aforementioned lighting unit comprises a smooth regulon, it is based on the illumination value of the information of the aforementioned back light unit of a kind of supplying corresponding to the outside, and regulate the aforementioned intensity of the aforementioned lights be radiated to aforementioned back light unit, and aforementioned illumination value is the illumination value in the predefined illumination value of aforementioned various back light units.
11. the device of inspection back light unit as claimed in claim 1, it is characterized in that wherein aforementioned lighting unit comprises a smooth regulon, it is based on the illumination value of the information of the aforementioned back light unit of a kind of supplying corresponding to the outside, regulate the aforementioned intensity of the aforementioned lights that is radiated to aforementioned back light unit, and aforementioned illumination value is the illumination value in the predefined illumination value of aforementioned various back light units.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040104602 | 2004-12-11 | ||
| KR10-2004-0104602 | 2004-12-11 | ||
| KR20040104602 | 2004-12-11 | ||
| KR1020050104358 | 2005-11-02 | ||
| KR1020050104358A KR100722223B1 (en) | 2004-12-11 | 2005-11-02 | Apparatus for inspecting back light unit |
| KR10-2005-0104358 | 2005-11-02 | ||
| PCT/KR2005/004225 WO2006062379A1 (en) | 2004-12-11 | 2005-12-09 | Apparatus for inspecting backlight unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101076720A CN101076720A (en) | 2007-11-21 |
| CN101076720B true CN101076720B (en) | 2010-05-05 |
Family
ID=37161019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200580042527XA Expired - Fee Related CN101076720B (en) | 2004-12-11 | 2005-12-09 | Apparatus for inspecting backlight unit |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100722223B1 (en) |
| CN (1) | CN101076720B (en) |
| TW (1) | TWI307436B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101595446B1 (en) * | 2009-02-27 | 2016-02-18 | 엘지디스플레이 주식회사 | Backlight unit inspection apparatus and method |
| KR101008903B1 (en) * | 2010-08-31 | 2011-01-17 | 레이져라이팅(주) | Light guide plate inspection device |
| CN103472072A (en) * | 2013-09-09 | 2013-12-25 | 深圳市维图视技术有限公司 | Novel visual inspection method and device for glass tube defects |
| CN104732900B (en) * | 2013-12-20 | 2017-06-16 | 昆山国显光电有限公司 | Picture element flaw detection method and device |
| CN104267034B (en) * | 2014-09-11 | 2017-04-05 | 汕头轻工装备研究院 | A kind of backlight screen visual detection equipment |
| CN105785604A (en) * | 2014-12-24 | 2016-07-20 | 台湾动力检测科技股份有限公司 | Defect detection method for optical layer of display device |
| CN105093585A (en) * | 2015-08-19 | 2015-11-25 | 武汉华星光电技术有限公司 | System and method for detecting liquid crystal display module |
| JP7482824B2 (en) * | 2021-04-15 | 2024-05-14 | Ｔｏｗａ株式会社 | Resin molding device and method for manufacturing resin molded product |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030142245A1 (en) * | 2001-12-22 | 2003-07-31 | Kim Kyoung Sub | Backlight unit of liquid crystal display device and method of assembling the same |
| CN1501073A (en) * | 2002-11-18 | 2004-06-02 | 日本麦可罗尼克斯股份有限公司 | Inspection method and device of display panel |
| CN1527046A (en) * | 2003-03-07 | 2004-09-08 | 友达光电股份有限公司 | Method and device for testing liquid crystal display panel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2955856B1 (en) | 1998-05-21 | 1999-10-04 | ミナトエレクトロニクス株式会社 | Display element inspection screen inspection method provided with display element surface defect extraction method and inspection apparatus used for the implementation |
| KR100479073B1 (en) * | 2002-06-19 | 2005-03-25 | 엘지전자 주식회사 | Apparatus of inspection for back light unit |
-
2005
- 2005-11-02 KR KR1020050104358A patent/KR100722223B1/en not_active Expired - Fee Related
- 2005-12-08 TW TW094143333A patent/TWI307436B/en not_active IP Right Cessation
- 2005-12-09 CN CN200580042527XA patent/CN101076720B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030142245A1 (en) * | 2001-12-22 | 2003-07-31 | Kim Kyoung Sub | Backlight unit of liquid crystal display device and method of assembling the same |
| CN1501073A (en) * | 2002-11-18 | 2004-06-02 | 日本麦可罗尼克斯股份有限公司 | Inspection method and device of display panel |
| CN1527046A (en) * | 2003-03-07 | 2004-09-08 | 友达光电股份有限公司 | Method and device for testing liquid crystal display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100722223B1 (en) | 2007-05-29 |
| CN101076720A (en) | 2007-11-21 |
| KR20060066041A (en) | 2006-06-15 |
| TWI307436B (en) | 2009-03-11 |
| TW200619784A (en) | 2006-06-16 |
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