CN110488515B - LED light bar detection device and method of backlight source - Google Patents
LED light bar detection device and method of backlight source Download PDFInfo
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- CN110488515B CN110488515B CN201910722689.1A CN201910722689A CN110488515B CN 110488515 B CN110488515 B CN 110488515B CN 201910722689 A CN201910722689 A CN 201910722689A CN 110488515 B CN110488515 B CN 110488515B
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000000903 blocking effect Effects 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 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 invention discloses a device and a method for detecting an LED lamp bar of a backlight source, and relates to the technical field of backlight source detection. The LED lamp carrier is technically characterized by comprising an industrial personal computer, a carrier and a digital camera in signal connection with the industrial personal computer, wherein the carrier comprises a placing surface and a detection surface which are arranged in a reverse manner, a lamp strip groove for placing a lamp strip is formed in the placing surface, a plurality of light source holes for placing LED lamps are formed in the bottom wall of the lamp strip groove along the length direction, and shading blocking pieces are arranged on one sides, far away from the lamp strip groove, of the light source holes; the shading blocking piece comprises a loose shading layer of a main body and a compact shading layer which is arranged on the loose shading layer and is in a bar code shape; the digital camera faces the detection surface and is used for shooting and acquiring image information of the shading blocking sheet on the detection surface.
Description
Technical Field
The invention relates to the technical field of backlight source detection, in particular to a device and a method for detecting an LED lamp bar of a backlight source.
Background
The LED lamp has the advantages of good energy-saving effect, long service life, high luminous efficiency and basically no heat generation, so that the LED lamp is widely applied to various illumination scenes. In the backlight source of the existing liquid crystal display, an LED light bar is generally used to provide a light source, and the LED light bar is used in cooperation with a light guide plate to realize the overall light emission of the backlight source.
In the brightness test mode of the LED light bar in the prior art, the brightness of the LED light bar is generally observed by naked eyes to judge whether the brightness of the LED light bar is qualified or not; therefore, the subjectivity is strong, different people have different requirements on the threshold value of whether the brightness is qualified, and the standards are different; there may also be instances of detection omission.
Disclosure of Invention
In view of the above problems, a first objective of the present invention is to provide a device for detecting an LED light bar of a backlight, which has the advantages of stable LED brightness detection effect and low omission.
In order to achieve the purpose, the invention provides the following technical scheme: the LED lamp strip detection device of the backlight comprises an industrial personal computer, a carrier and a digital camera in signal connection with the industrial personal computer, wherein the carrier comprises a placing surface and a detection surface which are arranged in an opposite mode, a lamp strip groove for placing a lamp strip is formed in the placing surface, a plurality of light source holes for placing LED lamps are formed in the bottom wall of the lamp strip groove along the length direction, and shading blocking pieces are installed on one sides, away from the lamp strip groove, of the light source holes; the shading blocking piece comprises a loose shading layer of a main body and a compact shading layer which is arranged on the loose shading layer and is in a bar code shape; the digital camera faces the detection surface and is used for shooting and acquiring image information of the shading blocking sheet on the detection surface.
By adopting the technical scheme, when the lamp strip is placed in the lamp strip groove, and the LED lamp is placed in the light source hole; after the LED lamp is lightened, the light source irradiates the shading blocking sheet; the light source part emitted by the LED lamp can penetrate through the loose shading layer but cannot penetrate through the compact shading layer; therefore, the greater the brightness of the light source, the greater the brightness difference between the loose and dense light-shielding layers. When the brightness reaches a certain value, the shape of the bar code shape can be clearly displayed on the shading blocking sheet; so that the picture taken by the digital camera will acquire a pattern in the shape of a bar code. Therefore, the industrial personal computer identifies through the bar code, if the bar code graph can be identified, the LED brightness meets the requirement, and if the image cannot be identified, the LED brightness does not meet the requirement. In conclusion, the judgment of the detected brightness threshold is objective, and the advantages of stable LED brightness detection effect and low possibility of omission are achieved.
The invention is further configured to: the dense shading layer is pasted on the end face, facing the placing face, of the loose shading layer.
Through adopting above-mentioned technical scheme, through pasting on the mode with compact shading layer and loose light shield layer, compare in the mode of scribbling the compact shading layer at loose light shield layer, compact shading layer and loose light shield layer can separately process, and it is more convenient to process manufacturing.
The invention is further configured to: the loose shading layer is white.
By adopting the technical scheme, the light source is generally shielded by the dense shading layer, and the end face of the shading blocking piece facing to the detection surface is black. And the color difference between white and black is the largest, so that the industrial personal computer can conveniently identify the image of the bar code.
The invention is further configured to: the bar code shapes of the dense shading layers correspond to unique numbers.
By adopting the technical scheme, the bar code shapes of the dense shading layers correspond to unique numbers, so that each LED lamp corresponds to one number during detection; if the serial number can be scanned and obtained after detection, the LED lamp at the corresponding position is qualified, and if the serial number is not obtained, the LED lamp at the corresponding position is not existed or is unqualified, so that the industrial personal computer can autonomously judge the brightness of the LED lamp at which positions is qualified and the brightness of the LED lamp at which positions is unqualified through a digital camera.
The invention is further configured to: the placing surface is provided with an indicator lamp corresponding to the light source hole, and the indicator lamp is electrically connected with the industrial personal computer.
Through adopting above-mentioned technical scheme, the pilot lamp plays indicating action, and the industrial computer can play the effect of instructing through the bright of controlling corresponding position pilot lamp and going out.
The invention is further configured to: and a sealing ring is bonded on the inner wall of the opening of the light source hole.
Through adopting above-mentioned technical scheme, the sealing ring is used for sheltering from light for the bright light of LED lamp can not follow and jets out in the light source hole, guarantees that the luminance of LED lamp can not too much scatter and disappear.
The invention is further configured to: the light source hole is characterized in that a reflective film is adhered to the side wall on one side of the light source hole and the side wall which is obliquely arranged, and the high end face of the obliquely arranged side wall faces one side of the placing face.
By adopting the technical scheme, the LED lamp emits light sources by the side walls except for orthographic emission, so that the light of the LED lamp emitting light sources by the side walls can be reflected to the shading baffle plate in a mode that the inclined side walls are matched with the reflecting film for the light sources.
The method for detecting the LED lamp strip of the backlight source according to the first purpose comprises the following steps:
step 1, powering on a light bar by an industrial personal computer to light an LED lamp;
3, identifying the number information of the bar code in the image information by the industrial personal computer;
step 4, the industrial personal computer compares the identified number with the input number information, obtains the unidentified number information, and marks the unidentified number information as unqualified;
and 5, lighting the indicator lamp corresponding to the unqualified serial number by the industrial personal computer.
By adopting the technical scheme, the shot image is judged by the industrial personal computer; and if the brightness of the bar code on the shading blocking piece in the shot image meets the requirement, the industrial personal computer can acquire the information of the bar code, otherwise, the industrial personal computer cannot acquire the information of the bar code. The number of the LED lamps can be obtained through the number of the obtained bar codes, and the judgment result is more objective. In addition, due to the code number information of the qualified bar code, the industrial personal computer can scan the code to pass; the bar code scan information that has been entered and cannot be read is encoded information that is not qualified in brightness. Therefore, the corresponding LED lamp can be found quickly through unqualified numbers.
Compared with the prior art, the invention has the beneficial effects that:
(1) whether the brightness of the LED lamp of the lamp strip reaches a threshold value or not is judged by setting the bar code identification through an industrial personal computer, so that the judgment is more objective;
(2) by setting each bar code to be a unique number, the position of an unqualified LED lamp can be quickly acquired through the number.
Drawings
FIG. 1 is a schematic structural diagram of the present embodiment;
FIG. 2 is a schematic cross-sectional view of a carrier according to an embodiment of the present invention;
fig. 3 is an enlarged schematic view of a in fig. 2.
Reference numerals: 1. an industrial personal computer; 2. a support frame; 3. a carrier; 4. a digital camera; 5. a base plate; 6. supporting legs; 7. placing the noodles; 8. detecting a surface; 9. a light bar groove; 10. a light source hole; 11. a shading baffle plate; 12. loosening the light shielding layer; 13. densifying the shading layer; 14. an indicator light; 15. a seal ring; 16. a light-reflecting film; 17. and a light supplement lamp.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
In an embodiment, an LED light bar detection device of a backlight source, as shown in fig. 1, includes an industrial personal computer 1, a support frame 2, a carrier 3, and a digital camera 4. The support frame 2 comprises a rectangular bottom plate 5 and four support legs 6 vertically fixed on four corners of the bottom plate 5. The carrier 3 is fixedly arranged on the upper sides of the four supporting legs 6, and a space is reserved between the lower side end face of the carrier 3 and the bottom plate 5 of the supporting frame 2 to form a bottom chamber; the digital camera 4 is fixed on the bottom plate 5 and is positioned in the bottom chamber; the camera of the digital camera 4 faces the bottom surface of the carrier 3 and is used for shooting images of the bottom surface of the carrier 3.
As shown in fig. 1 and 2, the carrier 3 includes a placing surface 7 disposed on an upper end surface and a detecting surface 8 disposed on a lower end surface, a plurality of light bar grooves 9 for placing light bars are formed in parallel on the placing surface 7, and a plurality of light source holes 10 for placing LED lamps are formed in a bottom wall of the light bar grooves 9 along a length direction; and a light shielding blocking sheet 11 for blocking the bottom of the light source hole 10 is arranged on the detection surface 8. The bottom surface of the digital shooting carrier 3 acquires the image information of each shading baffle plate 11 on the detection surface 8 of the carrier 3. The industrial personal computer 1 is in signal connection with the digital camera 4 and is used for acquiring image information shot by the digital camera 4.
As shown in fig. 2 and 3, the shading baffle 11 includes a loose shading layer 12 and a dense shading layer 13 arranged on the loose shading layer 12 and having a bar code shape; the loose light shielding layer 12 is made of a light shielding material, but a fine gap allowing light to pass through exists on the loose light shielding layer 12, the light on one end face of the loose light shielding layer can be seen, and the light on the other end face of the loose light shielding layer can be shielded to generate a projection, and the material of the loose light shielding layer 12 can be paper, a curtain and a film; the light shielding dense layer 13 is also made of a light shielding material, and light cannot pass through the light shielding dense layer 13, for example, a beam of light is projected on one end face of the light shielding dense layer 13, and cannot be seen on the other end face of the light shielding dense layer 13. The dense shading layer 13 is fixedly adhered to the loose shading layer 12, the dense shading layer 13 is in a bar code shape, and the bar code shape on each shading blocking piece 11 corresponds to a unique number.
As shown in fig. 2 and 3, when the LED lamp in the light source hole 10 is turned on, the light source irradiates the light shielding plate 11; the light source part emitted by the LED lamp can penetrate through the loose shading layer 12 and cannot penetrate through the compact shading layer 13; therefore, as the brightness of the light source is larger, the brightness difference between the light shielding layer 12 only having the loose light shielding layer 12 and the light shielding layer 12 to which the dense light shielding layer 13 is attached is larger. Therefore, when the brightness reaches a certain value, the shape of the bar code can be clearly displayed on the shading baffle plate 11; so that the picture taken by the digital camera 4 will acquire the pattern of the bar code at the designated position of the digital camera 4 (see fig. 1). After the industrial personal computer 1 obtains the image data shot by the digital camera 4, the unique number corresponding to the clear bar code shape can be obtained through bar code online identification, and the unclear bar code shape cannot be identified. Therefore, at this stage, the LED lamp corresponding to the light-shielding barrier 11 that can acquire the unique number has the brightness reaching the threshold value, and otherwise has not reached the threshold value.
In order to obtain the unique number of the shading blocking sheet 11 corresponding to the LED lamp which does not reach the threshold value, the industrial personal computer 1 records the number information of all the bar codes. After the industrial personal computer 1 scans the image information, all the obtained numbers are compared with the recorded numbers one by one, and the numbers which do not exist in the recorded numbers are the numbers of which the brightness does not reach the threshold value in all the number information. Each light shielding baffle 11 corresponds to a unique number, so that the corresponding position of the light source hole 10 can be found through the number which does not reach the threshold value.
Further, as shown in fig. 2, an indicator lamp 14 is disposed on the placement surface 7 corresponding to the light source hole 10, and the indicator lamp 14 is electrically connected to the industrial personal computer 1. The indicator light 14 is controlled by the industrial personal computer 1 to be turned on and off, and the indicator light 14 corresponds to the number of the two-dimensional code on the shading baffle 11 in the light source hole 10. The industrial personal computer 1 controls the on or off of the indicator lamp 14 based on whether the number corresponding to the indicator lamp 14 reaches a threshold value. In this embodiment, the industrial personal computer 1 lights the indicator lamp 14 which does not reach the number corresponding to the threshold value, so that the indicator lamp 14 is used as the indicator lamp 14 whose brightness does not reach the threshold value.
Further, as shown in fig. 2 and fig. 3, the longitudinal section of the light source hole 10 is rectangular, and the opening of the light source hole 10 is bonded with an annular sealing ring 15, the inner wall of the sealing ring 15 extends towards the inner side of the light source hole 10, after the LED lamp on the light bar is inserted into the light source hole 10, the sealing ring 15 can shield the edge of the light source hole 10, and the edge of the opening of the light source hole 10 is prevented from leaking from a part of the light source. Meanwhile, the side wall on one side in the light source hole 10 is inclined with the high end facing the placing surface 7, so that the light source hole 10 is in a circular table shape with the small area on one side of the placing surface 7 and the large area of the detection surface 8. And the reflecting film 16 is adhered to the side wall of the light source hole 10 in an inclined manner, so that when the LED lamp with the side wall emitting a light source is tested, the inclined side wall is matched with the reflecting film 16 to reflect horizontal light into vertical light, and the light of the LED lamp with the side wall emitting the light source can be reflected to the shading blocking layer.
As shown in fig. 1, a light supplement lamp 17 disposed outside the digital camera 4 is fixed on the bottom cavity of the supporting frame 2, and the light supplement lamp 17 is annular and used for providing a light source facing the detection surface 8, so that the digital camera 4 does not capture images excessively dark.
To sum up, in placing the lamp strip that needs to detect the lamp strip and placing the lamp strip groove 9 on the face 7 of carrier 3 to connect the power for the lamp strip after, the detection method of industrial computer 1 to the lamp strip is:
step 1, an industrial personal computer 1 is used for lighting LED lamps when a lamp strip is electrified;
3, the industrial personal computer 1 identifies the number information of the bar code in the image information;
step 4, the industrial personal computer 1 compares the identified number with the input number information, obtains unidentified number information, and marks the unidentified number information as unqualified;
and 5, lighting the indicator lamp 14 corresponding to the unqualified number by the industrial personal computer 1.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The utility model provides a LED lamp strip detection device of backlight, includes industrial computer (1) and carrier (3), its characterized in that: the LED lamp carrier is characterized by further comprising a digital camera (4) connected with an industrial personal computer (1) through signals, the carrier (3) comprises a placing surface (7) and a detection surface (8) which are arranged in a reverse mode, a lamp strip groove (9) for placing a lamp strip is formed in the placing surface (7), a plurality of light source holes (10) for placing LED lamps are formed in the bottom wall of the lamp strip groove (9) along the length direction, and a shading blocking piece (11) is installed on one side, away from the lamp strip groove (9), of each light source hole (10); the shading blocking sheet (11) comprises a loose shading layer (12) of a main body and a dense shading layer (13) which is arranged on the loose shading layer (12) and is in a bar code shape; the digital camera (4) faces the detection surface (8) and is used for shooting and acquiring image information of a shading blocking sheet (11) on the detection surface (8); when the brightness of a light source emitted by the LED lamp reaches a certain value, the light can penetrate through the loose shading layer (12) but cannot penetrate through the dense shading layer (13); the bar code shape is clearly displayed on the light shielding shutter (11).
2. The LED light bar detection device of the backlight source of claim 1, wherein: the dense light shielding layer (13) is stuck to the end face of the loose light shielding layer (12) facing the placing face (7).
3. The LED light bar detection device of the backlight source of claim 1, wherein: the loose shading layer (12) is white.
4. The LED light bar detection device of the backlight source of claim 1, wherein: the bar code shapes of the dense shading layer (13) correspond to unique numbers.
5. The LED light bar detection device of the backlight source of claim 4, wherein: the placing surface (7) is provided with an indicator lamp (14) corresponding to the light source hole (10), and the indicator lamp (14) is electrically connected with the industrial personal computer (1).
6. The LED light bar detection device of the backlight source of claim 1, wherein: and a sealing ring is bonded on the inner wall of the opening of the light source hole (10).
7. The LED light bar detection device of the backlight source of claim 1, wherein: and a reflective film (16) is adhered to the side wall on one side of the light source hole (10) and the side wall which is obliquely arranged, and the high end of the obliquely arranged side wall faces to one side of the placing surface (7).
8. The detection method of the LED light bar detection device of the backlight source of claim 7 is characterized in that: the method comprises the following steps:
step 1, an industrial personal computer (1) turns on an LED lamp for a lamp strip in a power-on mode;
step 2, the industrial personal computer (1) acquires image information shot by the digital camera (4);
step 3, the industrial personal computer (1) identifies the number information of the bar code in the image information;
step 4, the industrial personal computer (1) compares the identified number with the input number information, obtains the unidentified number information, and marks the unidentified number information as unqualified;
and 5, lighting an indicator lamp (14) corresponding to the unqualified number by the industrial personal computer (1).
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| CN201910722689.1A CN110488515B (en) | 2019-08-06 | 2019-08-06 | LED light bar detection device and method of backlight source |
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| CN201910722689.1A CN110488515B (en) | 2019-08-06 | 2019-08-06 | LED light bar detection device and method of backlight source |
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| CN110488515B true CN110488515B (en) | 2020-07-07 |
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| CN113505622A (en) * | 2021-06-01 | 2021-10-15 | 深圳市亿联无限科技有限公司 | Test system and method for automatically identifying multiple bar codes and LED lamps |
| CN119316592A (en) * | 2024-12-11 | 2025-01-14 | 舜宇光学（浙江）研究院有限公司 | Delay time detection method, system and time measurement standard |
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| US8687181B2 (en) * | 2012-02-03 | 2014-04-01 | Epistar Corporation | Method and apparatus for testing light-emitting device |
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| CN105300666A (en) * | 2015-11-05 | 2016-02-03 | 苏州威盛视信息科技有限公司 | LED lamp strip detection device and method |
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- 2019-08-06 CN CN201910722689.1A patent/CN110488515B/en active Active
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| CN102564572A (en) * | 2010-12-29 | 2012-07-11 | 致茂电子(苏州)有限公司 | Detecting method for simulating light-mixing state of LED (light-emitting diode) light sources |
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