KR100690332B1 - Checkup apparatus for back light unit - Google Patents

Abstract

The present invention relates to a BLU (Back Light Unit) inspection apparatus, and according to the present invention, the camera for acquiring the image of the Bielu circumferentially having a constant radius around the Bielu in a state in which the center of shooting By controlling according to a user's intention to move in a direction, a technique related to a BEL inspection apparatus capable of accurate inspection regardless of the height of the prism acid of the polarizing plate constituting the BEL is disclosed.

BLU, LCD, Inspection System

Description

Biel U Inspection Equipment {CHECKUP APPARATUS FOR BACK LIGHT UNIT}

1A is a schematic exploded perspective view of an LCD module.

FIG. 1B is an assembled perspective view of BEL configured in the LCD module of FIG. 1A. FIG.

FIG. 2 is a cross-sectional view of the polarizing plate configured in the BEL oil of FIG. 1B.

3 and 4 are reference diagrams for explaining the image acquisition of the BEL according to the cited technology.

5 is an external view of a BEL inspection apparatus according to an exemplary embodiment of the present invention.

6 is an internal configuration diagram of the BEL inspection apparatus of FIG. 6.

FIG. 7 is a block diagram of the main configuration of the BEL inspection apparatus of FIG.

FIG. 8 is a reference diagram for explaining a state of use of the BEL inspection apparatus of FIG.

* Description of the symbols for the main parts of the drawings *

500: BI oil test device 50: control device

51: main body casing 51a: laboratory

51b: entrance and exit 52: guide rail

53: lighting jig 54: the first camera

55: second camera 56: third camera

57: image processing device 58: second camera moving device

58a: guide frame 58a-1: guide groove

58b: Moving shaft 58c: Rack gear

58d: Pinion Gear 58e: Motor

59: third camera moving device 60: display device

61: input device

P: location point

The present invention relates to a BLU (BLU) inspection apparatus, and more particularly, to a technique of acquiring an image of a BLU by a camera.

Recently, LCD (Liquid Crystal Display), which is being used as a display device, has been put into practical use since the 1990s, and its market size is rapidly expanding due to product excellence.

The general LCD module is composed of a cell 10 and a cell B, as shown in the exploded perspective view of Figure 1a.

The cell 10 consists of two glass plates 11 and 12 and the liquid crystal 13 arrange | positioned between these two glass plates 11 and 12.

In addition, the BEL 20 includes an LED (23) element 23 for irradiating light to the reflecting plate 21 formed on the bottom surface, the light guide plate 22 located above the reflecting plate 21, and the light guide plate 22. The first diffuser 24 positioned above the light guide plate 24, the two diffuser plates 25 and 26 arranged in the upper side of the first diffuser plate 24 and having polarizations orthogonal to each other, and two polarizer plates ( The second diffusion plate 27 located on the upper side of the 25 and 26, and the mold frame 28 for tying and modularizing the outline of the above configuration. FIG. 1B is an assembled perspective view of the BEL 20 modularized by the mold frame 28.

FIG. 2 is a cross-sectional view of the polarizing plates 25 and 26. Referring to FIG. 2, a plurality of prism acids 25a and 26a are formed on the polarizing plates 25 and 26. However, the height of the prism acid (25a, 26a) is different according to each product, the refraction of the light may vary according to this difference.

On the other hand, before combining the BEL 20 and the cell 10, the defect on the BEL 20 should be inspected first, and at this time, the defect of the BEL 20 is a point defect (black spot, white spot). , Scratches, foreign objects, stains, and the like.

Conventionally, the defect of the BEL 20 is inspected by visual observation, but the visual observation has problems such as fatigue of the examiner's eyes, a drop in vision, and inaccuracy of the examination due to the limitation of vision. Therefore, in recent years, a technology for acquiring images of the BEL 20 using a camera has emerged, and examples of such techniques include Korean Registered Utility Model Publication No. 20-0375228 (designation name: backlight unit using image processing technology). Automatic defect inspection apparatus, hereinafter referred to as 'quotation technology 1').

According to the cited technology 1, a vertical image acquisition camera obtains a vertical image by performing a line scan at a 90 degree angle with respect to BielU, and obtains a viewing angle image by diagonally scanning a line at a predetermined angle with respect to the Biel U using a viewing angle image acquisition camera. In addition, the vertical image and the viewing angle image thus obtained are comprehensively processed by the image processing means and then output through the monitor.

On the other hand, since the prism acids 25a and 26a are formed in the polarizing plates 25 and 26 as described above, refraction of light occurs, it is also important to photograph the BEL 20 in the vertical direction. ) Is also very important for obtaining a clear image. In addition, since the degree of refraction of light is different depending on the height of the prism mountains 25a and 26a, it is necessary to adjust the photographing angle in the oblique direction depending on the product.

Therefore, according to the citation technique 1, the camera 32 for acquiring the viewing angle image is provided in order to photograph the BEL 20 in a predetermined oblique direction. Further, the viewing angle image acquisition camera 32 may adjust the inclination angle to arbitrarily adjust the shooting angle.

However, since the photographing center is moved together when the viewing angle image acquisition camera 32 according to the reference technology 1 adjusts the inclination angle, as shown in FIG. 3, the vertical image obtained by the vertical image acquisition camera 31 is used. Acquisition time and the viewing angle of the viewing angle image by the viewing angle image acquisition camera 32 may be different, this process has to complicate the process of comprehensively processing the vertical image and the viewing angle image. That is, when the inclination angle of the viewing angle image acquisition camera 32 is adjusted so that the image acquisition time point of the vertical image acquisition camera 31 and the viewing angle image acquisition camera 32 is different, the Biel placed on the moving lighting jig When the oil 20 is located at the point A of FIG. 3, the image obtained by the vertical image acquisition camera 31 is acquired, and the BEL 20 placed on the lighting jig continues to move from the point A of FIG. 3. When located at the point B, the image by the viewing angle image acquisition camera 32 is obtained.

Therefore, when the vertical image acquisition camera 31 and the viewing angle image acquisition camera 32 are controlled to shoot continuously, the image processing means is performed by the vertical image acquisition camera 31 and the viewing angle image acquisition camera 32. Since it is necessary to comprehensively process each image after determining whether the acquired image is the image for the BEL 20, a program and a procedure required for such determination are necessary, and for the BEL 20 continuously moving. Acquiring an image inevitably leads to poor inspection. If the BEL 20 is located at the point A, the vertical image acquisition camera 31 is driven to acquire an image. If the BEL 20 is located at the point B, the viewing angle image acquisition camera ( 32) may be considered as a method of controlling to acquire an image, but it is difficult to configure a control means for such control separately. Furthermore, according to the reference technology 1, the angle of inclination of the viewing angle image acquisition camera 32 is obtained. It is also very difficult because it is adjusted manually.

Therefore, the inventor of the present application, as introduced in the Republic of Korea Utility Model Registration Application No. 2005-0011686 (name of the bill: Biel inspection device, hereinafter referred to as 'quotation technology 2'), the state of the camera's shooting center coincided Has developed a technology to perform accurate inspections because the tilt angle of the camera can be adjusted. However, in the case of the cited technology 2, problems such as the hassle of moving the camera manually and the fine level of inclination angle adjustment are quite difficult have emerged.

The present invention has been made to solve the above-described problems, while the user can input the shooting angle adjustment of the camera while the shooting angle can be changed while the camera's shooting center is always fixed to capture the BEL. It is an object of the present invention to provide a BEL inspection apparatus that can be automatically performed by the command to perform, and also fine adjustment of the tilt angle.

Biel oil inspection apparatus according to the present invention for achieving the above object, the body casing having a test chamber therein; At least one camera positioned in an examination room of the main body casing and photographing the BLU location point below the examination room; An image processing apparatus which processes an image photographed by the at least one camera; A position shifting device for allowing the specific camera to move in the circumferential direction with a predetermined radius from the location point while the photographing center of the at least one camera coincides with the location point; A control device for controlling the operation of the position shifting device; An input device for inputting a user's command to control the operation of the position movement device to the control device; And a display device for outputting image information processed by the image processing device. By including a, it is possible to adjust the shooting angle of the camera without changing the recording center of the camera, it is also convenient to use because the position of the camera can be adjusted by the input device.

The at least one camera comprises: a first camera photographing a BEL located on the location point in a vertically upward direction of the location point; And second and third cameras disposed at left and right sides of the first camera, respectively, for photographing the BIELs positioned on the location point in an oblique direction. The position shifting device includes a second camera that allows the second camera to move in a circumferential direction with a predetermined radius from the location point while the photographing center of the second camera coincides with the location point. Moving device; And a third camera moving apparatus for allowing the third camera to move in the circumferential direction with a predetermined radius from the location point while the photographing center of the third camera is coincident with the location point. It includes a more specific feature to include.

The position shifting device is a guide having a curved guide groove for guiding the specific camera to move in a circumferential direction with a predetermined radius from the location point while the photographing center of the specific camera is coincident with the location point. frame; A moving shaft fixed to the specific camera and moving along a guide groove formed in the guide frame; A motor providing power for allowing the moving shaft to move along the guide groove; And a transmission device for transmitting power of the motor to the moving shaft. It includes a more specific feature to include.

In addition, the BEL inspection apparatus according to the present invention for achieving the above object, the body casing having a test chamber therein; Located in the inspection chamber of the main body casing, and disposed on the left side of the BLU (Locusation Point) Location Point (BLU) below the examination room, the BUL oil located on the location point from left to right A second camera photographing in an inclined tilt direction; A third camera positioned in an examination room of the main body casing and disposed on the right side of the main body point to photograph the BEL positioned on the location point in an inclined direction from the right side to the left side; A second camera moving device for allowing the second camera to move in a circumferential direction with a predetermined radius from the location point while the photographing center of the second camera is coincident with the location point; A third camera moving apparatus for allowing the second camera to move in a circumferential direction with a predetermined radius from the location point while the photographing center of the third camera is coincident with the location point; A control device for controlling the operation of the second camera moving device and the third camera moving device; An input device for inputting a user's command to control operations of the second camera moving device and the third camera moving device to the control device; An image processing apparatus for processing images captured by the second camera and the third camera; And a display device for outputting image information processed by the image processing device. Characterized in that it comprises a.

The second camera moving device or the third camera moving device may be configured such that the second camera or the second camera has a predetermined radius from the location point while the photographing center of the second camera or the third camera coincides with the location point. A guide frame having a curved guide groove for guiding to move in a circumferential direction; A moving shaft fixed to the second camera or the third camera and moving along a guide groove formed in the guide frame; A motor providing power for allowing the moving shaft to move along the guide groove; And a transmission device for transmitting power of the motor to the moving shaft. It includes a more specific feature to include.

Hereinafter, preferred embodiments will be described so that the present invention described above can be understood in more detail.

FIG. 5 is an external view of a BEL inspection apparatus 500 according to an exemplary embodiment of the present invention, and FIG. 6 is a perspective view schematically illustrating a structure of an inspection chamber 51a in the BEL inspection apparatus 500 of FIG. 5. FIG. 7 is a block diagram of the BEL inspection apparatus 500 of FIG. 5.

5 to 7, the BEL inspection apparatus 500 according to the present embodiment includes a main body casing 51, a guide rail 52, a lighting jig 53, a first camera 54, and a second. Camera 55, third camera 56, image processing device 57, second camera moving device 58, third camera moving device 59, control device 50, input device 61 and display Device 60 and the like.

The above-described configuration will be described in more detail as follows.

In front of the main body casing 51, an examination room 51a including first to third cameras 54, 55, 56, and the like is shown therein, and a display device 60 is disposed on the right side. In addition, an entrance and exit port 51b for entering and exiting the BEL oil 20 placed on the lighting jig 53 is formed on the right side surface of the main body casing 51.

The guide rail 52 guides the movement of the lighting jig 53.

The lighting jig 53 is moved by the driving means (not shown) and moves on the guide rails 52. On this lighting jig 53, the BEL 20 to be inspected is placed. In addition, the lighting jig 53 applies the power to the LED element of the BL 20 to emit the LED element.

The first camera 54 photographs a vertical downward direction in a state in which the first camera 54 is vertically upward from a bottom surface of the examination room 51a. In this case, the photographing center of the first camera 54 is a location point P of the BEL 20, which is a point where the BEL 20 positioned on the lighting jig 53 is moved for inspection. The location point P is always fixed here. That is, in this description, the point where the BEL which has been moved together with the lighting jig 53 is positioned for inspection is defined as a location point P.

In addition, according to the implementation, in order to obtain a good image, the first camera 54 may also be able to adjust the vertical height.

The second camera 55 is disposed on the left side of the location point P, and photographs the BI 22 on the location point P in an inclined direction inclined from the left to the right. The center is the location point P.

The third camera 56 is disposed on the right side of the location point P, and photographs in an inclined direction inclined from right to left. Similarly, the photographing center is the location point P. FIG.

The image processing apparatus 57 processes the images photographed by the first to third cameras 54, 55, and 56 into image information that can be output by the display apparatus 60 to be described below. .

The second camera moving device 58 has a predetermined radius of the second camera 55 from the location point P while the photographing center of the second camera 55 coincides with the location point P. FIG. To move in the circumferential direction. The second camera moving device 58 includes a guide frame 58a having a curved guide groove 58a-1, a moving shaft 58b moving along the guide groove 58a-1, and the movement. And a rack gear 58c coupled to the shaft 58b, a pinion gear 58d engaged with the rack gear 58c, a motor 58e for rotating the pinion gear 58d, and the like. .

The curved guide groove (58a-1) is the second camera 55 is fixed from the location point (P) in the state that the recording center of the second camera 55 coincides with the location point (P). Guide to move circumferentially with radius. Therefore, the guide groove 58a-1 is formed such that each point of the guide groove 58a-1 has a constant distance from the location point P.

The moving shaft 58b may move along the guide groove 58a-1. Of course, although the second camera 55 is fixedly connected to the moving shaft 58b, it is preferable that the rear end of the second camera 55 is fixedly connected as shown in FIG. In addition, the moving shaft 58b is preferably provided in a structure having a cross section having the same shape as that of the guide groove 58a-1 in order to stably move the guide groove 58a-1.

The rack gear 58c is coupled to the moving shaft 58b and has a curved shape in the same shape as that of the guide groove 58a-1.

The pinion gear 58d rotates in engagement with the rack gear 58c.

Of course, the rack gear (58c) and the pinion gear (58d) is only one embodiment configured as a transmission device for transmitting the power of the motor (58c) to the moving shaft (58b), various configurations for configuring the delivery device Mechanical configurations will be possible.

The motor 58e provides power for rotating the pinion gear 58d and is provided as a forward and reverse rotation motor capable of forward and reverse rotation. Of course, assuming that the reducer is configured in the motor 58e, finer inclination angle adjustment may be possible.

The third camera moving device 59 is omitted because the second camera moving device 58 and the configuration thereof are symmetrical and identical to each other.

On the other hand, the control device 50 controls the forward and reverse rotation of the motor 58e. Here, the control device 50 may be configured to be controlled simultaneously so that the motor 58e of the second camera moving device 58 and the motor of the third camera moving device 59 rotate in a symmetrical manner. It can also be configured to be controlled separately for each motor.

The input device 61 is used as a tool for inputting a user's command to control the rotation of the motor 58e to the control device 50. Such an input device 61 is preferable to be provided at the lower side of the display device 60 in the external view of FIG. If the control device 50 is configured to separately control the motor 58e of the second camera moving device 58 and the motor of the third camera moving device 59, even in the case of the input device 61. It must be configured to input a command to control each motor separately.

The display device 60 outputs image information processed by the image processing device 57.

The operating state of the BEL inspection apparatus 500 according to the present embodiment as described above will be described.

In general, for example, if you need a test for the BEL to be applied to the display device of the mobile phone, it will be necessary to check a large number of BEL. On the other hand, the polarizing plates constituted in each of such a large number of Biel oil will have the same characteristics because the prism acid of the same height is formed. Therefore, when the setting of the camera is completed for the first one BEL, it is possible to perform the inspection for the other BELUs without setting the camera.

Find out the camera's position settings first.

First, when the lighting jig 53 moves outside the inspection chamber 51a through the inlet and outlet 51b, the sample BEL 20 for the inspection object is placed on the lighting jig 53 by an automatic process or a manual process.

The lighting jig 53 in which the BJ 20 is positioned moves to the inside of the examination room 51a through the inlet and outlet 51b, and then the BJ 20 on the lighting jig 53 is located at the location point P. The movement of the lighting jig 53 is stopped. Of course, the movement of the lighting jig 53 is guided by the guide rail 52.

As the BEL 20 is located at the location point P, the first camera 54 photographs the BEL 20 in the vertically upward direction of the location point P, and the second camera 55 disposed on the left side. ) Photographs the BIEL 20 in an inclined direction inclined from left to right, and the third camera 56 disposed on the right photographs the BIEL 20 in an inclined direction inclined from the right.

Subsequently, the image processing apparatus 57 comprehensively processes the images photographed by the first to third cameras 54, 55, and 56.

The integrated image information as described above is output through the display device (60).

Meanwhile, the user adjusts the inclination angles of the second and third cameras 55 and 56 through the input device 60 while observing the image information of the BEL 20 output through the display device 60. . That is, while adjusting the inclination angles of the second and third cameras 55 and 56, the sharpest image information is output. In this case, when the user inputs a command to the control device 50 through the input device 60, the control device 50 controls the rotation of the motor 58e in accordance with the user's command. When the motor 58e faithfully rotates in response to the user's command, the pinion gear 58d rotates in response to the rotation, and the rack gear 58c moves in response to the rotation of the pinion gear 58d. Since the rack gear 58c is fixedly coupled to the moving shaft 58b, the moving shaft 58b moves along the guide groove 58a-1, and ultimately, the second camera coupled to the moving shaft 58b ( 55) the third camera 56 is moved. Of course, the second camera 55 or the third camera 55, as shown in the reference diagram of Figure 8, because the shooting center is fixed to the location point (P) while moving, it occurs when the shooting center is shaken Not.

In this way, after the positions of the second and third cameras 55 and 56 are set, the same procedure as described above, in which the setting process of the camera is omitted, can be continuously performed for the other BILS.

Of course, if the object to be inspected is changed again to another BEL, for example, the BELU applied to the display device of the small amusement machine, the second and third cameras 55 and 56 for the BELU applied to the display device of the small amusement machine. After setting the position of, you can use.

As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings. However, since the above-described embodiments have only been described by way of example, the present invention is limited to the above embodiments. It should not be understood that the scope of the present invention is to be understood by the claims and equivalent concepts described below.

As described in detail above, according to the present invention, since the shooting angle can be changed while the photographing center of the camera for photographing the BEL is always fixed, the image acquisition of the BEL is easy and the image processing is concisely solved. Accurate inspection can be performed. In addition, since the user can conveniently control the position of the camera through the input device, while increasing the ease of use, there is a synergistic effect that can directly output the best image.

Claims (5)

A main body casing having an examination room therein; At least one camera positioned in an examination room of the main body casing and photographing the BLU location point below the examination room; A position shifting device for allowing the specific camera to move in the circumferential direction with a predetermined radius from the location point while the photographing center of the at least one camera coincides with the location point; A control device for controlling the operation of the position shifting device; An input device for inputting a user's command to control the operation of the position movement device to the control device; And A display device for outputting image information photographed by the at least one camera; Biel oil inspection apparatus comprising a. The method of claim 1, The at least one camera, A first camera photographing the BEL located on the location point in a vertically upward direction of the location point; And Second and third cameras disposed on left and right sides of the first camera, respectively, for photographing a BIEL disposed on the location point in an inclined direction so as to be inclined from top to bottom so that the photographing focus points toward the location point; Including, The position shift device, A second camera moving device for allowing the second camera to move in a circumferential direction with a predetermined radius from the location point while the photographing center of the second camera is coincident with the location point; And A third camera moving apparatus for allowing the third camera to move in the circumferential direction with a predetermined radius from the location point while the photographing center of the third camera coincides with the location point; Biel oil inspection apparatus comprising a. The method of claim 1, The position shift device, A guide frame having a curved guide groove for guiding the specific camera to move in the circumferential direction with a predetermined radius from the location point while the photographing center of the specific camera is coincident with the location point; A moving shaft fixed to the specific camera and moving along a guide groove formed in the guide frame; A motor providing power for allowing the moving shaft to move along the guide groove; And A transmission device for transmitting power of the motor to the moving shaft; Biel oil inspection apparatus comprising a. A main body casing having an examination room therein; Located in the inspection chamber of the main body casing, and disposed on the left side of the BLU (Locusation Point) Location Point (BLU) below the examination room, the BUL oil located on the location point from left to right A second camera photographing in an inclined tilt direction; A third camera positioned in an examination room of the main body casing and disposed on the right side of the main body point to photograph the BEL positioned on the location point in an inclined direction from the right side to the left side; A second camera moving device for allowing the second camera to move in a circumferential direction with a predetermined radius from the location point while the photographing center of the second camera is coincident with the location point; A third camera moving apparatus for allowing the second camera to move in a circumferential direction with a predetermined radius from the location point while the photographing center of the third camera is coincident with the location point; A control device for controlling the operation of the second camera moving device and the third camera moving device; An input device for inputting a user's command to control operations of the second camera moving device and the third camera moving device to the control device; A display device for outputting image information photographed by the second camera and the third camera; Biel oil inspection apparatus comprising a. The method of claim 4, wherein The second camera moving device or the third camera moving device, A curved guide for guiding the second camera or the third camera to move in the circumferential direction with a predetermined radius from the location point while the photographing center of the second camera or the third camera is coincident with the location point. A guide frame having a groove formed therein; A moving shaft fixed to the second camera or the third camera and moving along a guide groove formed in the guide frame; A motor providing power for allowing the moving shaft to move along the guide groove; And A transmission device for transmitting power of the motor to the moving shaft; Biel oil inspection apparatus comprising a.

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