KR20060076916A - Inspector of gravity in liquid crystal display device - Google Patents

Abstract

The present invention relates to a gravity tester of a liquid crystal display device that can easily take out the liquid crystal panel by attaching a hook to the robot hand that moves the liquid crystal panel upright, thereby safely conducting the gravity defect inspection. A heating chamber for receiving a cassette including the cassette and heating it to a predetermined condition; an inspection table for inspecting abnormality of gravity failure of the liquid crystal panel; a good quality port for storing a liquid crystal panel determined as good on the inspection table; and a defective product on the inspection table. Take out the defective port for storing the liquid crystal panel and the liquid crystal panel determined from the cassette and move the liquid crystal panel to the test stand, and the hook is provided at the end and the vacuum hole is provided on the surface where the liquid crystal panel touches. Safely move the liquid crystal panel that is judged to be defective to good or bad port Key features a yirueojim including a robot hand.

Robot Hand, Hook, Vacuum, Gravity Checker

Description

Gravity tester of liquid crystal display {Inspector of Gravity in Liquid Crystal Display Device}

1 is an exploded perspective view showing a general liquid crystal display device

2 is a photograph showing gravity failure occurring in a liquid crystal display

3 is a cross-sectional view taken along line II ′ of FIG. 2;

4 is a schematic diagram of a gravity checker of the liquid crystal display of the present invention;

Figure 5 is a perspective view showing in detail the gravity checker of the liquid crystal display of the present invention

6 is a front view showing the robot hand of FIG.

7 is a side view showing the robot hand of FIG.

8 is a rear view of the robot hand of FIG.

9 is a side perspective view showing a state in which the liquid crystal panel is transferred to the inspection bar using the robot hand;

10 is a cross-sectional view showing a robot hand fixing a liquid crystal panel using a vacuum hole and a hook.

11 is a process flowchart showing a gravity test method using a gravity tester of the liquid crystal display of the present invention.

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

110: robot hand 130: inspection chamber

150: heating chamber 170: defective port

190: Inspection Table 200: Good Product Port

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device. In particular, a hook is attached to a robot hand that moves the liquid crystal panel in an upright position. It is about.

As the information society develops, the demand for display devices is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display panels (PDPs), electro luminescent displays (ELD), and vacuum fluorescent (VFD) Various flat panel display devices such as displays have been studied, and some of them are already used as display devices in various devices.

Among them, LCD is the most widely used as the substitute for CRT (Cathode Ray Tube) for mobile image display device because of its excellent image quality, light weight, thinness, and low power consumption. In addition to the use of the present invention has been developed in various ways such as a television and a computer monitor for receiving and displaying broadcast signals.

In order to use such a liquid crystal display as a general screen display device in various parts, it is a matter of how high quality images such as high definition, high brightness and large area can be realized while maintaining the characteristics of light weight, thinness and low power consumption. Can be.

Hereinafter, a liquid crystal display and a gravity failure caused by the conventional liquid crystal display will be described with reference to the accompanying drawings.

1 is an exploded perspective view showing a general liquid crystal display.

A general liquid crystal display device, as shown in FIG. 1, is injected between a first substrate 1 and a second substrate 2 bonded to each other with a predetermined space, and between the first substrate 1 and the second substrate 2. It consists of the liquid crystal layer 3.

In more detail, the first substrate 1 may have a plurality of gate lines 4 in one direction and constant in a direction perpendicular to the gate lines 4 at regular intervals to define the pixel region P. FIG. A plurality of data lines 5 are arranged at intervals. In addition, a pixel electrode 6 is formed in each pixel region P, and a thin film transistor T is formed at a portion where each of the gate lines 4 and the data lines 5 intersect with each other so that the thin film transistors are formed. The data signal of the data line is applied to each pixel electrode according to the signal of the gate line.

In addition, a black matrix layer 7 is formed on the second substrate 2 to block light in portions other than the pixel region P, and portions R corresponding to the respective pixel regions are formed to express colors. , G, B color filter layers 8 are formed, and a common electrode 9 for realizing an image is formed on the color filter layers 8.

In the liquid crystal display as described above, the liquid crystal layer 3 formed between the first and second substrates is aligned by an electric field between the pixel electrode 6 and the common electrode 9, and the liquid crystal layer 3 of the liquid crystal layer 3 is aligned. The amount of light passing through the liquid crystal layer 3 can be adjusted according to the degree of alignment to express the image.

Such a liquid crystal display device is called a twisted nematic (TN) mode liquid crystal display device, and the TN mode liquid crystal display device has a disadvantage of having a narrow viewing angle and an in-plane switching (IPS) mode for overcoming the disadvantages of the TN mode. Liquid crystal display devices have been developed.

In the IPS mode liquid crystal display, a pixel electrode and a common electrode are formed parallel to each other at a predetermined distance in a pixel area of the first substrate so that a lateral electric field (horizontal electric field) is generated between the pixel electrode and the common electrode and the lateral electric field is generated. This is to align the liquid crystal layer.

Meanwhile, a general method of manufacturing a liquid crystal display device may be classified into a liquid crystal injection method manufacturing method and a liquid crystal drop method manufacturing method according to a method of forming a liquid crystal layer between the first and second substrates.

First, the liquid crystal injection method will be briefly described as follows.

The container containing the liquid crystal material to be injected and the liquid crystal panel into which the liquid crystal is to be injected are placed inside the chamber, and the pressure in the chamber is maintained in a vacuum state to remove moisture from the liquid crystal material or the inner wall of the container and to bubble. The inside space of the liquid crystal panel is made into a vacuum state at the same time as the desorption.

The liquid crystal injection hole of the liquid crystal panel is immersed in or contacted with a container containing a liquid crystal material in a desired vacuum state, and then the pressure inside the chamber is changed from a vacuum state to an atmospheric pressure state, and the pressure inside the liquid crystal panel and the pressure of the chamber. By the difference, the liquid crystal material is injected into the liquid crystal panel through the liquid crystal injection hole.

There existed the following problems in the liquid crystal display device manufacturing method of such a liquid crystal injection system.

First, after cutting into a unit panel, the liquid crystal injection hole is immersed in the liquid crystal liquid by maintaining the vacuum state between the two substrates, so that the liquid crystal injection takes a lot of time, the productivity is reduced.

Second, in the case of manufacturing a large-area liquid crystal display device, when the liquid crystal is injected by the liquid crystal injection method, the liquid crystal is not completely injected into the panel, which causes a defect.

Third, since the process is complicated and time-consuming as described above, several liquid crystal injection equipment is required, which requires a lot of space.

Accordingly, in order to overcome the problems of the liquid crystal injection method, a method of manufacturing a liquid crystal drop type liquid crystal display device in which a liquid crystal is dropped on one of two substrates and then the two substrates are bonded to each other has been developed.

The liquid crystal display device manufacturing method of the liquid crystal dropping method is a method of bonding two substrates after dropping an appropriate amount of liquid crystal onto any one of the two substrates before bonding the two substrates together.

FIG. 2 is a photograph illustrating gravity failure occurring in a liquid crystal display, and FIG. 3 is a cross-sectional view of the structure along the line II ′ of FIG. 2.

As shown in FIG. 2, the gravity failure phenomenon is observed at the edge of the liquid crystal panel close to the ground. This is because, when the liquid crystal panel is placed in a high temperature state, the edge of the liquid crystal panel close to the ground bulges bulge by the property that the liquid crystal expands with temperature.

As shown in FIG. 3, when the upper and lower sides of the liquid crystal panel 10 are cut, the column spacer 20 positioned at the lower edge of the liquid crystal panel 10 supports the first and second substrates 1 and 2 by the expansion force of the liquid crystal. It does not, and the phenomenon which falls from the 1st board | substrate 1 arises. In particular, when the liquid crystal panel 10 is upright in the state in which the liquid crystal is dripped excessively, the phenomenon that the liquid crystal flows toward the ground close to the ground under the influence of gravity becomes severe.

Here, a seal pattern 25 is formed at an edge of the liquid crystal panel 10 to bond the first and second substrates 1 and 2 to each other, and between the first and second substrates 1 and 2. The liquid crystal layer 3 is formed of the liquid crystal dropped therein. As shown, the cell gap between the region in which gravity failure occurs and the region in which gravity failure does not occur is different from the liquid crystal layer 3, and this portion appears to be broken in appearance when the liquid crystal display is driven.

However, the conventional liquid crystal display device as described above has the following problems.

When the liquid crystal is filled by the liquid crystal dropping method, an appropriate amount may not be dropped into the liquid crystal panel, but may be unfilled or excessively dropped.

In particular, when the liquid crystal panel is erected in an excessive drop, an excessive amount of liquid crystal concentrates on the side close to the ground, and when the liquid crystal expands at a high temperature in this region, bulging occurs. This is called gravity failure, which lowers the visibility and, in severe cases, cannot use a liquid crystal panel in which gravity failure occurs. Therefore, such gravity failure should be inspected prior to release to select only products having a certain level of gravity failure. However, conventionally, there is no device for inspecting such a gravity failure, and in large part relied on the direct operation of humans.

The present invention has been made in order to solve the above problems, by adding a hook (hook) to the robot hand to move the liquid crystal panel upright to facilitate the take-out of the liquid crystal panel of the liquid crystal display device that can safely proceed to gravity defect inspection Its purpose is to provide a gravity checker.

Gravity tester of the liquid crystal display device of the present invention for achieving the above object is a heating chamber for receiving a cassette containing a plurality of liquid crystal panels and heating them to a predetermined condition, and to check the abnormality of gravity failure of the liquid crystal panel A liquid crystal panel is taken out from an inspection table, a non-defective port for storing a liquid crystal panel judged as good on the inspection table, a defective port for storing a liquid crystal panel determined as defective on the inspection table, and the cassette, and moved to the inspection table. It is characterized in that it comprises a robot to move the liquid crystal panel determined as good or defective in the good or bad port.

The robot has a robot hand for taking out the liquid crystal panel. An end of the robot hand is further provided with a hook. The robot hand is moved upright when taking out the liquid crystal panel. At this time, the robot hand is erected at an angle of 45 to 90 degrees with respect to the ground. At least one vacuum hole is further formed on a surface of the robot hand that contacts the rear surface of the liquid crystal panel. The robot hand is formed in plural. The distance between the robot hands is adjustable according to the size of the liquid crystal panel.

In addition, an open inspection chamber may be further formed at a side of the heating chamber to allow the robot hand to enter and take out the liquid crystal panel.

The robot hand rotates in the inspection chamber to the inspection stand.

In addition, the robot hand rotates to the good or bad port in the inspection table.

In the heating chamber, the liquid crystal panel is heated at 55 to 70 ° C. for 1 to 2 hours.

A lower polarizer is fixed to the test table. In this case, whether or not the gravity failure is abnormal is to place the liquid crystal panel on the lower polarizing plate, the inspector to correspond to the upper polarizing plate on the top and observe the color change. The backlight unit is located below the inspection table. The backlight unit operates in an on state after the liquid crystal panel is positioned on the test table.

Hereinafter, a gravity tester of the liquid crystal display of the present invention will be described in detail with reference to the accompanying drawings.

4 is a schematic diagram of a gravity tester of the liquid crystal display of the present invention, and FIG. 5 is a perspective view showing the gravity tester of the liquid crystal display of the present invention in detail.

As shown in FIG. 4, the gravity inspector of the liquid crystal display device of the present invention is largely equipped with a heating chamber 150, an inspection chamber 180, a robot hand 110, an inspection table 190, a good quality port 200, and a defective port ( 170).

The heating chamber 150 is loaded with a cassette containing a plurality of liquid crystal panels on the upright form. The heating chamber 150 is heated at a temperature of 55 to 70 ° C. for about 2 hours while allowing the cassette to pass through the first to fourth heating chambers 151, 152, 153, and 154. At this time, the heating chamber 150 heats the panel in a hot air circulation structure by a fan in a closed chamber structure. At this time, in the heating chamber 150, the liquid crystal panel is vertically heated under a predetermined condition. The inside of the heating chamber 150 is an atmospheric pressure state to which a predetermined heating condition is applied.

In addition, the inspection chamber 180 has an open structure to allow the robot hand 110 to easily enter and withdraw the liquid crystal panel. In addition, by maintaining the temperature while heating the liquid crystal panel from the heating chamber by the down flow (hot flow) of the air curtain (heat curtain) type of products. In this case, the cassette containing the liquid crystal panel is tilted at an angle of 45 to 90 ° so that the robot hand 110 can easily take out the unit liquid crystal panel.

In addition, the robot hand 110 is attached to the robot hand 110 in a liquid crystal panel unit from a cassette continuously loaded from the heating chamber 150, taken out, and rotated, and placed on the test table 190. The robot hand 110 has a hook (see 112 in FIG. 7) formed at an end thereof, and a vacuum hole (see 113 in FIG. 7) is provided at an upper surface of the robot hand 110. While the liquid crystal panel is adsorbed onto the 110, the liquid crystal panel does not fall to the ground even when the robot hand is standing in a vertical position.

In addition, when the liquid crystal panel is introduced through the robot hand 110 in a state where the lower polarizer is positioned in the lower part in advance, the inspector determines whether the upper polarizer is in good condition while corresponding to the upper polarizer. . In this case, the back light unit is positioned below the transparent test table and the lower polarizer is fixed to the upper surface of the test table 190. Therefore, in the state where the liquid crystal panel enters the upper portion of the lower polarizing plate, the backlight unit is turned on and the inspector rotates the upper polarizing plate on the upper portion of the liquid crystal panel with respect to the center of the liquid crystal panel or gradually shifts the left and right or the vertical direction. By moving and observing color changes. At this time, the site where the gravity failure occurred is observed with a different color than other sites.

In this case, as illustrated, the inspection table 190 may have a two-column structure in which two liquid crystal panels correspond to each other, or a single-column structure in which only one panel corresponds. Even in the illustrated two-row structure, only one liquid crystal panel may correspond. In this case, the panel support guide is detachable, so that when one liquid crystal panel corresponds, the guide is detached, and when the two liquid crystal panels correspond, the guide can be attached again. In this case, the presence or absence information of the liquid crystal panel is automatically recognized by an OCR (Optical Charater Recognition) system attached to the inspection table.

In the above-described process, the liquid crystal panel judged as good quality is moved to the good quality port 200, and the liquid crystal panel determined as defective is moved to the defective port 170. Here, a good product refers to a liquid crystal panel whose degree is so small that the observer does not recognize even if there is no part observed in other colors or a different color occurs in the gravity inspection on the inspection table described above.

Here, the reason why the liquid crystal panel is vertically disposed in the cassette to move the chambers is that the cassette has a rectangular parallelepiped shape and the liquid crystal panel is positioned in a horizontal or vertical direction in the cassette. Since it is easy to observe in a state (vertically positioned state), it is placed in a vertical direction in the above-described gravity checker.

5, the gravity checker of the liquid crystal display of the present invention will be described in more detail.

Here, the gravity checker 100 of the liquid crystal display of the present invention shown in the structure is formed in two rows. In some cases, the gravity checker may be formed in a plurality of two or more rows. Meanwhile, according to the illustrated structure, when the liquid crystal panel is positioned on the inspection tables 190 corresponding to both sides, the inspector alternately performs the inspection.

In the gravity checker of the liquid crystal display of the present invention illustrated in FIG. 5, the heating chamber 150 and the inspection chamber 180 that are continuous to each other are formed in two rows, and a loading portion of each heating chamber 150 includes a gantry (Gantry). The traveling rails 120 are horizontally connected to each other, and the article traveling rails 130 are horizontally connected to the unloading portions of the respective inspection chambers. Here, the robot hand 110 and the inspection table 190 corresponding to the inspection chamber 180 of each row are located in an area facing the inspection chamber 180. Here, the robot hand 110 is connected to the body (300), and rotates about the body 300 as an axis.

A gantry robot 125 is positioned on the gantry running rail 120 to move a cassette loaded from the outside to the left and right, and when the heating chamber 150 is reached, the gantry robot 125 is lowered to lower the space of the heating chamber 150. Corresponds to the side. On the side of the heating chamber 150, a cassette feeding robot 160 capable of inserting a cassette into the heating chamber 150 is formed.

Here, the heating chamber 150 includes a plurality of heating parts 151, 152, 153, and 154. In the illustrated figure, the heating parts are four, and the number may be added or decreased according to the process time.

In this case, the side of the first heating unit 151 of the heating chamber 150 corresponds to. The side surface of the first heating unit 151 has a kind of door that opens and closes up and down.

In addition, an inspection chamber 180 connected to the traveling rail 130 and the discharge conveyor 140 is formed at the side of the fourth heating unit 154 where the heating chamber 150 ends.

The cassette buffer 210, which is a space for storing the cassette, is disposed in a predetermined space at the side of the heating chamber 150 on the side where the cassette is inserted. Then, one side of the cassette buffer 210 is formed a temporary cassette buffer 220 containing the empty cassette. In the temporary cassette buffer 220, a cassette without a liquid crystal panel is disposed and moved to the defective port 170 to perform gravity inspection on a liquid crystal panel basis from the cassette exiting through the heating chamber 150. After that, the defective liquid crystal panel determined as defective is contained.

At the end of the cassette buffer 210, a defective cassette port 170 is positioned to contain a cassette for receiving the NG-treated liquid crystal panel from the inspection table 190.

The robot hand 110 takes out a liquid crystal panel from the inspection chamber 180 and moves it to the inspection table 190. In this case, the robot hand 110 is provided with a hook (see 112 in FIG. 7) at a portion close to the ground of the liquid crystal panel on which it stands, to safely move the liquid crystal panel together with the vacuum hole provided in the robot hand.

Actually, the robot hand 110 is set at 45 to 90 ° with respect to the ground, which is a discernible angle of gravity failure, and is affected by gravity, so that the liquid crystal panel is large or heavy and can be handled by the robot hand. If the weight exceeds the area, there is a risk of falling to the ground. In the present invention, in order to prevent this, a hook (112 of FIG. 7) is further formed at the end of the robot hand 110. The reason why the robot hand 110 is erected is that the liquid crystal panel is erected due to gravity failure, and it is essential that the liquid crystal panel is erected to detect the gravity failure due to a phenomenon occurring in a high temperature state of a certain degree or more. The robot hand 110 moves by adsorbing the liquid crystal panel on its upper surface, and the robot hand 110 is essential because the liquid crystal panel is applied as it is with respect to the ground. In this case, 45 ° to 90 °, which is an angle capable of determining whether the gravity defect is poor, is an experimentally determined value, and determines the angle of the robot hand 110 in consideration of the horizontal area and the height occupied by the gravity checker.

Here, the inspection for determining the good or bad for the gravity failure in the inspection table 190 is fixed to the lower polarizing plate on the upper surface on the inspection table 190, after arranging the liquid crystal panel according to the inspection, the inspector is based on the center of the liquid crystal panel The color change is measured by rotating the upper polarizer on the liquid crystal panel or by moving left and right or up and down. The actual gravity test is performed by the examiner's naked eye and can be done in a fraction of a minute. Therefore, even after the heating is performed in the atmospheric pressure state in the heating chamber 150, even if the liquid crystal panel is placed in the atmospheric pressure state from the inspection chamber 180, the time is very short so that the liquid crystal panel can maintain a constant high temperature state. Therefore, gravity failure measurement is possible.

In the figure, the inspector is located in the center to represent the progress of both tests on the inspection stand on both sides.

On the other hand, the end of the cassette buffer 210 and the defective port 170 is located on the side pointed to the robot hand 110, the back of the robot hand 110, that is, the body port 300 side of the non-defective port 200 Is located. The liquid crystal panel selected as good is loaded in the cassette provided in the good quality port 200, and after the cassettes are all filled, the liquid crystal panel is unloaded to the article running rail 130 through the discharge conveyor 140 located at the side. The article running rail 130 also has a take-out robot 135 to move the cassette entered into the article running rail 130 on the article running rail 135.

Hereinafter, the robot hand used for the gravity tester of the liquid crystal display device of the present invention which can extract the liquid crystal panel for each unit will be described.

6 is a front view of the robot hand of FIG. 5, FIG. 7 is a side view of the robot hand of FIG. 5, and FIG. 8 is a rear view of the robot hand of FIG. 5.

6 to 8, the robot hand 110 for taking out the liquid crystal panel is provided with a total of four hands 111. Although not shown in actual drawings, referring to FIG. 5, the robot hand 110 rotates about a body (connected with 300 and 116 of FIG. 5).

Here, each of the hands 111 is provided with a vacuum hole 113, respectively, when the liquid crystal panel is taken out, the vacuum hole 113 corresponds to the back of the liquid crystal panel, so as to suck the liquid crystal panel by vacuum and the vacuum hole The pad 114 of an elastic material such as rubber is positioned around the 113 to prevent damage such as scratches when the liquid crystal panel is adsorbed. In addition, the hook 112 is formed at the end of the hand, and even though the liquid crystal panel is moved upright and pulled downward due to gravity, the hook 112 is moved together with the vacuum force of the vacuum hole 113. By physically holding the end of the liquid crystal panel can be prevented from falling.

The vacuum hole 113 is formed in a pin shape, and moves up and down to adsorb the liquid crystal panel.

The interval between the hands 111 of the robot hand 110 is adjusted by two rails 119 provided at the connection part 115. The stator 122 may be positioned on the two-rail rail 119 to pass the rail and fix the hand 111 at a predetermined position. The distance between the hand 111 and the hand is adjusted. The stator 122 is connected by a plurality of screws 118 provided in the installation portion 117 and the connection portion 115. In addition, after the stator 122 is fixed, the hand 111 is fixed to the connection portion 115 by a screw or other fastening means 121.

FIG. 9 is a side perspective view illustrating a liquid crystal panel being transferred to a test stand using a robot hand, and FIG. 10 is a cross-sectional view illustrating a robot hand fixing a liquid crystal panel using a vacuum hole and a hook.

As shown in Figure 9, the robot hand is erected at an angle of 45 to 90 degrees with respect to the ground. In addition, a hook is provided at an end thereof, and when the liquid crystal panel 250 corresponds, the vacuum hole 113 provided in the hand 111 sucks the vacuum and simultaneously supports the end of the liquid crystal panel 250. Thus, even if the vacuum pressure from the vacuum hole 113 is insufficient, the liquid crystal panel 250 may be prevented from falling. In this case, a pad 114 of silicon material is formed around the vacuum hole 113 to prevent the back surface from being scratched when the liquid crystal panel 250 is attached to the hand 111.

On the other hand, the robot hand 110 may be provided with a plurality of hands (111). In addition, a plurality of liquid crystal panels may correspond to the robot hand 110. For example, as shown, when four hands 111 are provided, one liquid crystal panel may correspond to two hands. As the size of the liquid crystal panel increases, a larger number of hands may correspond.

As such, the reason for forming the hook 112 at the end of the robot hand 110 is a vacuum hole provided in the robot hand 110 through the use of the hook 112 with the purpose of having stability when the liquid crystal panel moves. This is to reduce the vacuum pressure of the vacuum hole. When the liquid crystal panel is bonded to the robot hand 110, the stronger the vacuum pressure of the robot hand 110 is, to prevent the defect of the cell gap of the liquid crystal layer inside the bonded liquid crystal panel may occur. to be. When the robot hand 110 uses only vacuum pressure, a cell gap defect of the liquid crystal layer is caused, and a cell gap defect is caused by a difference in transmittance, which is connected to a luminance unevenness, and may be recognized as a stain defect by a user. Gravity tester of the present invention by providing a hook 112 at the end of the robot hand 110, it is possible to significantly reduce the vacuum pressure of the robot hand (110).

11 is a process flowchart showing a gravity test method using a gravity tester of the liquid crystal display of the present invention.

As illustrated in FIG. 11, the gravity test method using the gravity tester of the liquid crystal display of the present invention is performed by loading a cassette containing a plurality of liquid crystal panels vertically into the gravity tester 100 (S100).

Then, the cassette is moved to a heating chamber and heated (S110). At this time, give a temperature of 55 ~ 70 ℃ in about 1 to 2 hours and heat.

Then, the cassette is moved from the heating chamber to the inspection chamber (S120). Here, after the cassette is moved to the heating chamber, the movement to the inspection chamber is performed inline.

Subsequently, the liquid crystal panel is taken out using the robot hand in the inspection chamber (S130), and the taken out liquid crystal panel is transferred to the inspection table (S140). At this time, the liquid crystal panel is rotated by standing at a predetermined angle, for example, 45 to 90 degrees with respect to the ground using the robot hand.

Subsequently, the back light of the lower part is turned on at the inspection table to determine whether the liquid crystal panel is transferred or not (S150). Here, the lower polarizer is fixedly positioned on the inspection table. In the positive test of the liquid crystal panel, when the liquid crystal panel is displaced through the robot hand in this state, the inspector observes the color change while rotating the upper polarizing plate or moving the upper polarizing plate up and down or left and right.

The gravity tester of the liquid crystal display of the present invention as described above has the following effects.

First, a hook is provided at the end of the robot hand for taking out the liquid crystal panel. Even when the liquid crystal panel is tilted, the hook supports the liquid crystal panel together with the vacuum force of the robot hand, so that the vacuum force of the robot hand is excessively used. It can not, and can prevent energy consumption.

Second, as it proceeds to a large panel, it can be difficult to stably support the panel by the vacuum force of the robot hand gradually, so that a hook is used, so that the panel does not fall or slip even if the panel is tilted close to the vertical. Stable inspection can be made possible.                     

Third, the fall of the liquid crystal panel is prevented during the rotation operation of the robot can increase the productivity.

Fourth, by using the vacuum force and the hook together to increase the adsorption force of the liquid crystal panel of the robot hand, the drop of the liquid crystal panel is prevented, and the process of taking out a new liquid crystal panel by rotating the robot hand again to the inspection chamber during the fall can be omitted. This can reduce the turn around time (TAT) required for gravity testing.

Fifth, when the liquid crystal panel is bonded to the robot hand, the stronger the vacuum pressure of the robot hand is, the poorer the cell gap of the liquid crystal layer inside the bonded liquid crystal panel may occur. Since it can reduce, a cell gap defect can be prevented.

Claims (16)

A heating chamber which receives a cassette including a plurality of liquid crystal panels and heats the cassette to a predetermined condition; An inspection table for inspecting abnormality of gravity failure of the liquid crystal panel; A good quality port for storing a liquid crystal panel determined as good quality at the inspection table; A defective port for storing a liquid crystal panel determined as defective on the inspection table; And And a robot which takes out the liquid crystal panel from the cassette, moves the test bench to the test stand, and moves the liquid crystal panel determined as good or defective on the test stand to a good or bad port. The method of claim 1, And said robot comprises a robot hand for taking out said liquid crystal panel. The method of claim 2, Gravity tester of the liquid crystal display device, characterized in that the end of the robot hand is further provided with a hook. The method of claim 2, And the robot hand is moved upright when the liquid crystal panel is taken out. The method of claim 4, wherein The robot hand is a gravity tester of the liquid crystal display device, characterized in that the erected at an angle of 45 ~ 90 ° to the ground. The method of claim 2, At least one vacuum hole is further formed on a surface of the robot hand that faces the liquid crystal panel, wherein the gravity checker of the liquid crystal display device. The method of claim 2, The robot hand is a gravity tester, characterized in that formed in plurality. The method of claim 7, wherein The distance between the robot hands is adjustable according to the size of the liquid crystal panel, the gravity checker of the liquid crystal display device. The method of claim 2, And an open inspection chamber on the side of the heating chamber, in which the robot hand can enter and take out the liquid crystal panel. The method of claim 9, And the robot hand rotates in the inspection chamber according to the inspection chamber. The method of claim 2, The robot hand is a gravity tester of the liquid crystal display device, characterized in that the rotation movement from the inspection table to the good or poor port. The method of claim 1, The gravity chamber of the liquid crystal display device, characterized in that for heating the liquid crystal panel for 1 to 2 hours at 55 ~ 70 ℃ in the heating chamber. The method of claim 1, And a lower polarizing plate is fixed to the inspection table. The method of claim 13, The abnormality of the gravity failure is a gravity tester of the liquid crystal display device, characterized in that after the position of the liquid crystal panel on the lower polarizing plate, the inspector corresponds to the upper polarizing plate and observe the color change. The method of claim 14, And a backlight unit under the inspection table. The method of claim 15, And the backlight unit operates in an on state after the liquid crystal panel is positioned on the inspection table.

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