KR100840832B1 - Visual inspection apparatus of lcd panel - Google Patents

Abstract

A visual inspection apparatus of an LCD panel is provided to inspect outer appearance by using a line scan camera even when the LCD panel moves and integrally perform location align state inspection of a polarization film and state inspection of a glass substrate. A visual inspection apparatus of an LCD(Liquid Crystal Display) panel(100) comprises a transfer unit(120), first and second area photographing units, a controller and a monitor. The first area photographing unit photographs a data unit of the LCD panel, and comprises the followings. On a right upper part with respect of a transfer direction of the transfer unit, a first upper camera(132) and a first upper illuminating device(134) are installed to face each other in a state of being tilted at the same tilt angle on an upper surface of the LCD panel. On a right lower part with respect of the transfer direction of the transfer unit, a first lower camera(136) is installed on an extension line of the first upper illuminating device. A first lower illuminating device(138) is installed on an extension line of the first upper camera. The second area photographing unit photographs a gate unit of the LCD panel, and comprises the followings. On a left upper part with respect of a transfer direction of the transfer unit, a second upper camera(142) and a second upper illuminating device(144) are installed to face each other in a state of being tilted at the same tilt angle on the upper surface of the LCD panel. On a left lower part with respect of the transfer direction of the transfer unit, a first lower camera(146) is installed on an extension line of the second upper illuminating device. A second lower illuminating device(148) is installed on an extension line of the second upper camera. By receiving images photographed by the first and second area photographing units, the controller determines whether a defect occurs on outer appearance of the LCD panel.

Description

VISUAL INSPECTION APPARATUS OF LCD PANEL}

The present invention relates to an appearance inspection apparatus of an LCD panel, and more particularly, to a position alignment state of a polarizing film attached to an LCD panel which has been subjected to a polarizing film attachment process, a cutting state of a color filter glass substrate, and a state of a thin film transistor glass substrate. The present invention relates to a device that can collectively inspect for defects.

In general, an LCD panel is a rubbing process in which a liquid crystal cell forming a pixel unit, a panel manufacturing step of manufacturing a top plate and a bottom plate of a panel, an alignment layer for liquid crystal alignment, and a rubbing process are performed. And a liquid crystal injection step in which a liquid crystal is injected and encapsulated between the bonded upper and lower plates, and the upper and lower plates of the panel are bonded to each other. The lower panel of the panel is a thin film transistor glass substrate on which a thin film transistor (TFT) is arranged, and the upper panel of the panel is a color filter glass substrate on which a color filter (CF) is formed.

The LCD panel, which has undergone the liquid crystal injection, is subjected to a polarizing film attachment process in which a polarizing film is attached to the outer surfaces of the thin film transistor glass substrate and the color filter glass substrate, respectively. The LCD panel, which has been subjected to the polarizing film attachment process, is then subjected to an external appearance inspection process. In this case, the defective LCD panel is collected, and an Ore Lead Bonding process of attaching Tape Automated Bonding (TAB) for connecting the PCB circuit to the good is performed.

On the other hand, the inspection items of the LCD panel external inspection process is the alignment state inspection of the polarizing film attached to the LCD panel, the cutting state of the color filter glass substrate and the broken glass substrate of the thin film transistor glass substrate (Broken) Alternatively, there is a glass substrate condition test for checking whether cracks have occurred.

According to the prior art, the alignment inspection and the glass substrate inspection of the polarizing film were carried out separately as separate equipment. That is, in order to inspect the position alignment of the polarizing film, a plurality of area scan cameras are installed in a direction perpendicular to the LCD panel to be transported, and each corner of the LCD panel is photographed while the LCD panel is stopped. A stop test will be made. In addition, in order to inspect the state of the glass substrate, a plurality of area scan cameras are used to perform the step inspection for repeatedly performing the static inspection on both sides of the LCD panel.

The area scan camera used in the exterior inspection apparatus of the LCD panel according to the prior art has been used in the exterior inspection apparatus of the LCD panel because of its advantages of easy operation and excellent quality of the captured image. However, the exterior inspection apparatus of the LCD panel according to the prior art cannot cope with LCD panels of various sizes because the inspection area of the area scan camera is narrow. Therefore, there is a problem that the model of the appearance inspection apparatus must be changed according to the size of the LCD panel. In addition, since the LCD panel is inspected in a stopped state, a problem occurs that the inspection time is delayed.

In addition, the appearance inspection apparatus of the LCD panel according to the prior art is a separate inspection of the polarization film attachment state inspection and the glass substrate state inspection as a separate equipment, the overall inspection time is delayed, the cost of inspection is increased have.

In addition, the exterior inspection apparatus of the LCD panel according to the prior art uses only the reflected light, and the camera is installed in the perpendicular direction of the LCD panel to detect minute cracks or the like formed in the thickness direction of the color filter glass substrate and the thin film transistor glass substrate. There is a problem in that the detection performance is poor, such as failure.

The present invention was created to solve the above problems of the prior art, it is possible to inspect the alignment of the polarizing film and the inspection of the state of the glass substrate, all of the inspection items of the LCD panel in one device, the LCD panel The purpose of the present invention is to provide an appearance inspection apparatus of an LCD panel that can quickly inspect whether there is a defect even in the transport state of the device.

In addition, an object of the present invention is to provide a device for inspecting the appearance of an LCD panel, which can inspect LCD panels of various sizes and has excellent detection performance against defects.

In order to achieve the above object, the appearance inspection apparatus of the LCD panel according to the present invention comprises a transfer unit for transferring the LCD panel after the polarizing film attachment process by a plurality of rollers installed on the frame and rotated; A first upper camera and a first upper lighting device which are installed to face each other in a state inclined at the same inclination angle with respect to the upper surface of the LCD panel, respectively, on the upper right side with respect to the conveying direction of the conveying unit; A first area of the lower right portion configured to include a first lower camera installed on an extension line of the first upper lighting device and a first lower illumination device provided on an extension line of the first upper camera to photograph the data portion of the LCD panel; Photographing unit; The second upper camera and the second upper lighting device which are installed to face each other in an inclined angle with respect to the upper surface of the LCD panel on the upper left side with respect to the conveying direction of the conveying unit, and with respect to the conveying direction of the conveying unit A second area of the left lower portion is composed of a first lower camera installed on an extension line of the second upper lighting device and a second lower illumination device provided on an extension line of the second upper camera to photograph the gate portion of the LCD panel. Photographing unit; A controller which controls the cameras and the lighting apparatuses of the first and second area photographing units and receives images captured by the first and second area photographing units to determine whether there is a defect in the appearance of the LCD panel; And a monitor for outputting defects on the appearance of images captured by the first and second area photographing units and the LCD panel determined by the controller.

Further, in the present invention, it is preferable that the cameras of the first and second area photographing units are line scan cameras, and the lighting devices of the first and second area photographing units are line lighting devices made of LEDs.

In addition, in the present invention, it is preferable that the upper camera and the lower camera are installed so that the extension lines from the upper and lower cameras of the first and second area photographing units to the LCD panel have a predetermined position error with each other.

Further, in the present invention, the control unit preferably determines whether the position alignment state of the polarizing film attached to the LCD panel, the cutting state of the color filter glass substrate and the state of the corner portion of the thin film transistor glass substrate.

In addition, in the present invention, the monitor is a position alignment state of the polarizing film attached to the LCD panel, the cutting state of the color filter glass substrate, the state of the thin film transistor glass substrate, and whether the defect of each state on one screen It is more preferable to output each.

The appearance inspection apparatus of the LCD panel according to the present invention can perform the appearance inspection even when the LCD panel is moved by using a line scan camera, and the inspection of the alignment of the polarizing film attached to the LCD panel, which is an inspection item, and the glass substrate. Health checks can be checked in batches. This can reduce the cost for the external inspection of the LCD panel, there is an advantage that can reduce the inspection time.

In addition, the present invention has the advantage that the LCD panel of various sizes can be inspected using a line scan camera, and the detection performance of the LCD panel is excellent by using reflected light and transmitted light.

The object of the present invention and the configuration, operation and effect of the present invention to achieve the same will be more clearly understood by the following detailed description of the preferred embodiment of the present invention with reference to the accompanying drawings.

1 is a front view showing an appearance inspection apparatus of an LCD panel according to the present invention, Figures 2a and 2b is an enlarged view of the M portion of Figure 1, Figure 3 is a side view of FIG.

The external appearance inspection apparatus of the LCD panel according to the present invention is composed of a frame 110, the transfer unit 120, the first region photographing unit 130 and the second region photographing unit 140, the LCD which has undergone a polarizing film attachment process The appearance of the panel 100 is inspected.

The transfer part 120 is installed in the frame 110 and includes a motor 122 and a plurality of rollers 124. The plurality of rollers 124 are provided on the roller rotation shaft 123, and the motor 122 rotates the plurality of roller rotation shafts 123 to transfer the LCD panel 100 that has been subjected to the polarizing film attachment process. Arrows in FIG. 1 indicate a direction in which the transfer unit 120 transfers the LCD panel 100. In FIG. 3, which is a side view of FIG. 1, the conveying direction of the conveying part 120 is a direction entering the drawing.

Meanwhile, referring to FIG. 4, the structure of the LCD panel 100 that has been subjected to the polarizing film attachment process is described. The color filter glass substrate 104 and the thin film transistor glass substrate 106 are bonded to each other, and the liquid crystal 108 is interposed therebetween. Injecting and forming, the upper polarizing film 101 and the lower polarizing film 102 are attached to the outer surface of the color filter glass substrate 104 and the thin film transistor glass substrate 106, respectively. In this case, reference numeral 109 is formed on the color filter glass substrate 104 as a black matrix and bonded to the thin film transistor substrate 106 to distinguish cells into which the liquid crystal 108 is injected, and serves as a light blocking function. .

The inspection items for the appearance of the LCD panel according to the present invention include the inspection of the alignment state of the polarizing films 101 and 102 attached to the LCD panel, the cutting state of the color filter glass substrate 104 and the thin film transistor glass substrate 106. There is a glass board condition test to check whether cracks or cracks have occurred. In this case, the external appearance inspection apparatus of the LCD panel according to the present invention can inspect the inspection item by inspecting both sides of the LCD panel 100. That is, as shown in FIG. 4, both sides of the LCD panel 100 may include a data unit 100a in which the thin film transistor glass substrate 106 is extended from the color filter glass substrate 104, and the color filter glass substrate ( The thin film transistor substrate 106 and the thin film transistor substrate 106 may be divided into a gate portion 100b formed to extend substantially the same. At this time, the data unit 100a of the LCD panel is a place where the out lead bonding attaching the TAB for connecting the PCB circuit to the thin film transistor glass substrate 106 is completed after the external inspection process is completed. 100b) is where voltage is applied to drive the transistor afterwards.

3, the apparatus for inspecting external appearance of an LCD panel may include a first region photographing unit 130 photographing the first region A by being located on the right side with respect to the conveying direction of the conveying unit 120. The second region photographing unit 140 may be divided into a second region photographing unit 140 photographed on the left side with respect to the conveying direction of the conveying unit. Meanwhile, as illustrated in FIG. 4, the first region photographing unit 130 photographs the data portion 100a of the LCD panel, and the second region photographing unit 140 photographs the gate portion 100b of the LCD panel. Done. The first area photographing unit 130 and the second area photographing unit 140 have the same photographing mechanism for inspecting the appearance of the LCD panel 100 because the camera and the lighting apparatus are disposed in the same manner.

The first area photographing unit 130 includes a first upper camera 132, a first upper lighting device 134, a first lower camera 136, and a first lower lighting device 138. The first upper camera 132 and the first upper lighting device 134 are located at the upper right side with respect to the conveying direction of the conveying unit 120 as shown in FIG. 3, and as shown in FIG. 2A. It is installed to face each other in a state inclined at the same inclination angle (α) with respect to the upper surface of the LCD panel 100 transferred by. The first lower camera 136 and the first lower lighting device 138 are located at the lower right side with respect to the traveling direction of the transfer unit 120. In this case, the first lower camera 136 is installed on an extension line of the first upper lighting device 134, and the first lower lighting device 138 is installed on an extension line of the first upper camera 132. Therefore, as shown in FIG. 2A, the first lower camera 136 and the first lower lighting device 138 have an inclination angle α with respect to the LCD panel 100.

The second area photographing unit 140 includes a first upper camera 142, a second upper lighting device 144, a second lower camera 146, and a second lower lighting device 148. As shown in FIG. 3, the second upper camera 142 and the second upper lighting device 144 are positioned on the upper left side with respect to the conveying direction of the conveying unit 120, and as shown in FIG. 2A. It is installed to face each other in a state inclined at the same inclination angle (α) with respect to the upper surface of the LCD panel 100 transferred by. The second lower camera 146 and the second lower lighting device 148 are located at the lower left side with respect to the traveling direction of the transfer unit 120. In this case, the second lower camera 146 is installed on an extension line of the second upper lighting device 144, and the second lower lighting device 148 is installed on an extension line of the second upper camera 142. Accordingly, as shown in FIG. 2A, the second lower camera 146 and the second lower lighting device 148 have an inclination angle α with respect to the LCD panel 100.

Meanwhile, the cameras of the first and second area photographing units 130 and 140 may be line scan cameras. The line scan camera is more expensive than the area scan camera used in the exterior inspection apparatus of the conventional LCD panel, and has a disadvantage in that a professional technique is required for operation. On the other hand, one image can be acquired one line at a time, and infinitely long images can be obtained through continuous line scan. That is, the line scan camera has an advantage that the inspection time is fast since the photographing can be performed without stopping the LCD panel 100 transferred by the transfer unit 120.

In addition, since the line scan camera can capture a wider area than the area scan camera, the LCD panel 100 of various sizes can be inspected. That is, since the line scan camera can photograph the first area A and the second area B as shown in FIG. 3, the appearance inspection apparatus of the LCD panel according to the present invention is data of both sides of the LCD panel 100. When the part 100a and the gate part 100b are positioned in the first area A and the second area B, respectively, the appearance inspection can be performed. Therefore, the LCD panel of various sizes can be inspected without changing the model of the appearance inspection apparatus.

Meanwhile, the lighting devices of the first and second area photographing units 130 and 140 may be line lighting devices made of LEDs 134a. The lighting apparatus is composed of an LED which is a light source, and a lens for performing line illumination in the first area A and the second area B. FIG. That is, as shown in FIG. 3, the first upper lighting device 134 includes an LED 134a and a lens 134b. The line lighting device performs line lighting so that the line scan camera can acquire one image one line at a time.

5 to 7, the photographing mechanism of the first and second area photographing units 130 and 140 configured as described above will be described. FIG. 5 is an explanatory diagram for explaining that the first and second area photographing units of the inspection apparatus according to the present invention capture the image using the reflected light and the transmitted light. FIG. 5 illustrates a photographing mechanism of the data unit 100a of the LCD panel. .

The upper and lower polarizing films 101 and 102 attached to the LCD panel are polarized so as to vibrate in various directions, and the incident light is vibrated in only one direction, and the upper and lower polarizing films 101 and 102 are usually crossed at 90 degrees. have. In addition, the polarizing film has a property of not reflecting light. Therefore, the upper and lower polarizing films 101 and 102 appear black in the image taken by the camera because the upper and lower polarizing films 101 and 102 do not transmit or reflect the light irradiated from the upper and lower lighting devices 134 and 144. . Through this, the position alignment state of the polarizing film can be photographed. For example, FIG. 9 is a photograph showing an image indicating whether the polarizing film is aligned. FIG. 9A is an image from the data unit 100a, and FIG. 9B is an image from the gate unit 100b.

Photographing the glass substrate 104 uses the reflected light and the transmitted light of the illumination device. That is, FIG. 5 shows the data portion 100b of the LCD panel, wherein the upper cameras 132 and 142 and the upper lighting devices 134 and 144 are inclined at the same inclination angle α with respect to the LCD panel 100. Are installed to face each other, and the lower cameras 136 and 146 and the lower lighting devices 138 and 148 are installed to face each other in an inclined angle α with respect to the LCD panel 100. In addition, the arrow of a dashed-dotted line shows the reflected light, and the arrow of a 2-dashed dotted line shows the transmitted light. Since the black matrix 109 of the liquid crystal layer 108 does not transmit light, the upper cameras 132 and 142 may use color filter glass as reflected light from the upper lighting devices 134 and 144 reflected from the color filter glass substrate 104. The state of the substrate 104 can be photographed. At this time, after the inspection process, the pattern formed on the upper surface of the thin film transistor glass substrate 106 is subjected to the out-lead bonding process, so that the inspection is performed by focusing on the cutting state of the color filter glass substrate 104.

In the state inspection of the thin film transistor glass substrate 106, the state of the thin film transistor glass substrate 106 is transmitted by the lower illumination devices 138 and 148 that pass through the thin film transistor glass substrate 106 in the case of the upper cameras 132 and 142. You can shoot. In the case of the lower cameras 136 and 146, the transmitted light of the upper lighting devices 134 and 144 passing through the thin film transistor glass substrate 106 and the lower lighting devices 138 and 148 reflected from the thin film transistor glass substrate 106 are provided. The state of the thin film transistor glass substrate 106 can be imaged by the reflected light.

In the exterior inspection apparatus of the LCD panel according to the present invention, the conventional exterior inspection apparatus detects a defect on the exterior of the LCD panel using only the reflected light, and installs a camera and an illumination device on the upper and lower sides as described above, and transmits the reflected light as well as the transmitted light. Since it can be used to detect the defect is excellent. In addition, the camera of the conventional appearance inspection apparatus is installed in the perpendicular direction of the LCD panel did not detect the minute cracks and the like formed in the thickness direction of the glass substrate 104, 106, the present invention is to tilt the camera to the LCD panel It is possible to detect minute cracks and the like by photographing the upper and lower parts, thereby increasing the inspection efficiency.

Meanwhile, as shown in FIG. 2B, extension lines from the upper cameras 132 and 142 and the lower cameras 136 and 146 of the first and second area photographing units 130 and 140 to the LCD panel 100 may be provided. It is preferable that the upper camera and the lower camera are installed to have a predetermined position error (d) with each other. This makes it possible to more effectively detect the fine cracks described above.

6 and 7 will be described the inspection position and inspection items of the LCD panel. 6 and 7 indicate the conveying direction of the LCD panel 100. Referring to FIG. 6, the first upper camera 132 photographs the first area A to inspect the data unit 100a of the LCD panel 100, and the second upper camera 142 captures the LCD panel 100. The second area B is photographed to inspect the gate part 100b of FIG. The first upper camera 132 may photograph the upper polarizing film 101, the color filter glass substrate 104, and the thin film transistor glass substrate 106 of the data unit 100a of the LCD panel. Therefore, the inspection position of the position alignment state of a polarizing film is P area | region and R area | region of the 1st area | region A. FIG. In addition, the inspection position of the state of the glass substrates 104 and 106 is T area | region of the 1st area | region A. FIG.

In addition, the second upper camera 142 may photograph the upper polarizing film 101 and the color filter glass substrate 104 of the gate part 100b of the LCD panel. Since the cutting state of the color filter glass substrate does not need to be inspected in the gate portion 100b of the LCD panel, only the alignment state of the polarizing film is inspected. Therefore, the inspection position of the position alignment state of a polarizing film is Q area | region and S area | region of the 2nd area | region B. FIG.

Referring to FIG. 7, the first lower camera 136 may photograph the lower polarizing film 102 and the thin film transistor glass substrate 106 of the data unit 100a of the LCD panel 100. Therefore, the inspection position of the position alignment state of a polarizing film is P area | region and R area | region of the 1st area | region A. FIG. Further, the inspection position of the state of the thin film transistor glass substrate 106 is the T region of the first region A. FIG.

In addition, the second lower camera 146 may photograph the lower polarizing film 102 and the thin film transistor glass substrate 106 of the gate part 100b of the LCD panel 100. Since the state of the thin film transistor does not need to be inspected in the gate portion 100b of the LCD panel, only the polarization film position alignment state is inspected. Therefore, the inspection position of the position alignment state of a polarizing film is Q area | region and S area | region of the 2nd area | region B. FIG.

The controller (not shown) is connected to and controls the cameras and the lighting apparatuses of the first and second area photographing units 130 and 140. In addition, the controller (not shown) receives images captured by the first and second area photographing units 130 and 140 to determine whether there is a defect in the appearance of the LCD panel 100 by using a predetermined algorithm. The controller determines whether there are defects in the alignment status of the polarizing films 101 and 102 attached to the LCD panel 100, the cutting state of the color filter glass substrate 104, and the state of the thin film transistor glass substrate 106. It is preferable. That is, images of P area, Q area, R area, S area and T area photographed by the upper cameras 132 and 142, and P area, Q area, R area and S photographed by the lower cameras 136 and 146. The information obtained from the image of the region and the T region is determined by a predetermined algorithm to determine whether there is a defect in the appearance of the LCD panel 100. Details of the algorithm are beyond the scope of the present invention, so detailed description thereof will be omitted.

In addition, the controller synthesizes the images of the P area, the Q area, the R area, the S area, and the T area photographed by the upper cameras 132 and 142 and the lower cameras 136 and 146, respectively, and outputs them to a monitor (not shown). do.

The monitor (not shown) outputs whether the image is captured by the first and second area photographing units 130 and 140 by the controller and whether the defect of the external appearance of the LCD panel 100 determined by the controller is determined. do.

Referring to FIG. 8, the polarization film position alignment state display unit 152 displays the position alignment states of the polarization films 101 and 102 attached to the LCD panel 100, and the P region, the Q region, and the R region synthesized by the control unit. And an image of the S area. In FIG. 8, reference numeral 153 is a P region image, 154 is a Q region image, 155 is an R region image, and 156 is an S region image. The glass substrate state display unit 157 displays an image of the T region synthesized by the controller to output the cutting state of the color filter glass substrate 104 and the state of the thin film transistor glass substrate 106. The defect display unit 158 displays a defect on the appearance of the LCD panel 100 determined by the controller so that the user can recognize the defect.

9 is a photograph showing an image indicating whether or not the polarization film is aligned. FIG. 9A is a photograph showing an example of an image displayed by the P area display unit 153 or the R area display unit 155. FIG. 9B is a Q area display unit. An example of an image displayed by 154 or the S area display unit 156 is shown. For example, a method of inspecting the position alignment state of the polarizing films 101 and 102 attached to an LCD panel, for example, measuring the distance error dx and dy, which are the distance error between the edge of the polarizing film that appears black and the reference mark (+) formed on the LCD panel By checking the position alignment state of the polarizing film.

FIG. 10 is a photograph showing an image showing the states of the color filter glass and the thin film transistor glass, and shows an example of the image displayed on the glass substrate state display unit 157. Reference numeral 106 'denotes an external line of the thin film transistor glass substrate, reference numeral 104' denotes an external line of the color filter glass substrate, and reference numeral 160 denotes a pattern line for out lead bonding formed on the thin film transistor glass substrate. The cutting state of the outer line 104 'of the color filter glass substrate is important for performing outlead bonding in a subsequent outlead bonding process. In addition, the user can directly check the cracks or cracks of the thin film transistor glass substrate and the color filter glass substrate through the monitor.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters set forth in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

1 is a front view showing the appearance inspection apparatus of the LCD panel according to the present invention,

2A and 2B are enlarged views of part M of FIG. 1,

3 is a side view of FIG. 1,

4 is a schematic cross-sectional view for describing the structure of a data portion and a gate portion of an LCD panel;

FIG. 5 is an explanatory diagram for explaining that the first and second area photographing units of the inspection apparatus according to the present invention photograph by using the reflected light and the transmitted light;

6 is an explanatory diagram for explaining the inspection position of the LCD panel upper surface of the inspection apparatus according to the present invention,

7 is an explanatory view for explaining the inspection position of the LCD panel lower surface of the inspection apparatus according to the present invention,

8 is a schematic diagram showing an example of a screen output from the monitor of the present invention,

9a and 9b are photographs showing the image showing the position alignment state of the polarizing film,

10 is a photograph showing an image showing a state of a color filter glass and a thin film transistor glass.

<Explanation of symbols for main parts of the drawings>

100 LCD panel 101: upper polarizing film

102: lower polarizing film 104: color filter glass substrate

106: thin film transistor glass substrate 108: liquid crystal

109: Black Matrix 110: Frame

120: transfer unit 122: motor

124: roller 130: first area photographing unit

132: first upper camera 134: first upper lighting device

136: first lower camera 138: first lower lighting device

140: second area photographing unit 142: second upper camera

144: second upper lighting device 146: second lower camera

148: second lower illumination device 152: polarization film position alignment state display unit

157: glass substrate display unit 158: defect display unit

Claims (6)

A transfer unit installed in the frame and transferring the LCD panel which has been subjected to the polarizing film attachment process by a plurality of rotating rollers; A first upper camera and a first upper lighting device which are installed to face each other in a state inclined at the same inclination angle with respect to the upper surface of the LCD panel, respectively, on the upper right side with respect to the conveying direction of the conveying part, and with respect to the conveying direction of the conveying part A first lower camera installed on an extension line of the first upper lighting device and a first lower illumination device provided on an extension line of the first upper camera, and photographing a data part of the LCD panel; Area photographing unit; A second upper camera and a second upper lighting device which are installed to face each other in an inclined angle with respect to the upper surface of the LCD panel on an upper left side with respect to a conveying direction of the conveying unit, and with respect to a conveying direction of the conveying unit A second lower illumination device disposed on an extension line of the second upper illumination device and a second lower illumination device provided on an extension line of the second upper camera, and photographing a gate portion of the LCD panel; Area photographing unit; A controller which controls the cameras and the lighting apparatuses of the first and second area photographing units and receives images captured by the first and second area photographing units to determine whether there is a defect in the appearance of the LCD panel; And And a monitor for outputting defects on the appearance of the image captured by the first and second area photographing units and the LCD panel determined by the controller. The method of claim 1, Apparatus for inspecting the exterior of an LCD panel, wherein the cameras of the first and second area photographing units are line scan cameras. The method of claim 2, Apparatus for inspecting the exterior of an LCD panel, wherein the lighting devices of the first and second area photographing units are line lighting devices made of LEDs. The method of claim 1, The upper panel and the lower camera are installed so that the extension line from each of the upper and lower cameras of the first and second area photographing units to the LCD panel has a predetermined position error. . The method according to any one of claims 1 to 4, And the controller determines whether there are defects in the position alignment state of the polarizing film attached to the LCD panel, the cutting state of the color filter glass substrate, and the state of the thin film transistor glass substrate. The method of claim 5, The monitor outputs a position alignment state of the polarizing film attached to the LCD panel, a cutting state of the color filter glass substrate, a state of the thin film transistor glass substrate, and defects of each state on a single screen. Appearance inspection device of the LCD panel.

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