KR20090108496A - Liquid Crystal Display Device Liquid Crystal Alignment Rubbing Foam Test Method - Google Patents

Abstract

The present invention relates to a method for inspecting a rubbing cloth for a liquid crystal display device, including the step of bending the rubbing cloth to make it easy to see, and having an even conveying function of the rubbing cloth, an image acquisition process and a processing process It includes one or more devices or cameras, sensors, and the like, and includes a step of acquiring an inspection by the computer image processing the image collected from one or more cameras.

Description

Liquid Crystal Display Apparatus for inspecting rubbing cloth for liquid crystal orientation {Method of inspecting texture on a rubbing clothes}

In the present invention, a liquid crystal display fabric for liquid crystal alignment (also referred to as a rubbing cloth, hereinafter referred to as a rubbing cloth). The direction of fabrication (1 in FIG. 2), the angle (2 in FIG. 2), the bundle of the fabric (2 in FIG. 1), etc. As a method to inspect, the spacing of the bundles is very dense so that the inspection angle to inspect the space between the bundles of the guns should be secured. In addition, the inspection items (direction, angle, and omission of the trappings) need to be documented by rubbing cloth position, and this requires accurate feeding and uniform rubbing cloth transfer. In order to uniformly convey such a device, there is a need for an eccentricity, horizontality, and a technique for preventing the rubbing of the rubbing cloth.

Currently, high-definition display devices are used for LCD TVs, note books, mobile phones, etc., and the display devices are composed of LCD, OLED, PDP, etc., and LCD is currently used for TV, NOTE BOOK, etc. The processing of LCD forms a pattern on BARE GLASS (glass without any pattern) and makes an alignment groove so that the liquid crystal is evenly distributed on the glass, and then the TFT and COLOR FILTER are bonded to make the display device. . At this time, in order to make the alignment groove so that the liquid crystals are evenly distributed, wrap the rubbing cloth on the roll and mount the roll on the rubbing machine to rotate the rubbing roll to make a groove on the upper surface of the glass. The groove is a groove in which the liquid crystal is oriented, and the orientation of the rubbing cloth can be caused by a rubbing cloth, a defect in defect, defects, and the like.The rubbing cloth is subjected to a rubbing cloth cutting process. After inspecting the machine (detecting blemishes or thickness defects) or visual inspection to remove defects, it is fed into the rubbing machine. In this process, the rubbing cloth trapping test should be done before the rubbing cloth cutting process or before the winding process, so that even if there are no flawed rubbing cloths or defects, they can be cut and fitted to the rubbing roll in the direction of the catching.

It is a situation where a person checks a rubbing gun before the current rubbing gun winding and corrects the winding angle and the rubbing angle of the rubbing machine according to the trapping. It is the efforts of LCD companies to reduce defects through process improvement. Therefore, accurate data informatization of rubbing is required, and more accurate data is collected and analyzed by the inspection method of the present invention to prevent a large amount of defects in the mass production of LCD glass in advance, which is a defect that may occur before the rubbing of the rubbing cloth This can be solved by removing

In order to examine the direction of the fabric (1 in FIG. 2), the angle (2 in FIG. 2) and the bundle of the fabric (2 in FIG. 1), the gap between the gun bundle and the gun bundle is made to create a valid bundle bundle angle. It is important. To this end, a necessary inspection structure is needed, which can be solved by the following method. The inspection device may form an inspection angle, such as a non-inspectable gun bundle (10 in the figure) and a testable gun bundle (11 in the figure), such as a camera or sensor of a rubbing cloth (referred to in the following diagram). The angle forming mechanism (3 in the diagram) should be small enough to have a diameter or circular arc, and the longer the length of the angle forming mechanism (3 in the diagram) is, the center will be oriented downward. Utensils (5 in the diagram), etc. and utensils which have dug air suction grooves or holes in order to prevent the rubbing cloth from crying or to adhere the rubbing cloth to the utensils. There must be a mechanism (4 in the diagram) to reduce and correct the friction coefficient, and a guide roll or a mechanism (6 in the diagram) to maintain the inspection angle of the inspection apparatus. There must be a guide roll on the bottom of the rubbing cloth processed with air intake grooves or holes to prevent the rubbing of the rubbing cloth, or a mechanism (6 in the diagram), and contact with the upper surface of the effective area of the rubbing cloth (actually used). The conveying apparatus for uniformly conveying the rubbing cloth, which includes a guide roll or a mechanism (7 in the representative drawing) mounted on a portion other than the effective area with a rubbing cloth upper surface guide roll (in the drawing). (1) of the representative figure and utensils for uniformly holding the rubbing cloth (2 of the figure), which should not be inclined when the rubbing cloth is uniformly transported and installed. Inspection conditions for trapping can be created by including a rubbing cloth alignment guide baseline or by mounting an alignment guide fixture (15 in the diagram).

In a situation where it is difficult for a human to visually inspect a bundle of guns having an interval of about 1 mm (4 in FIG. 1), the current rubbing cloth is placed on a table, a small thin object such as a coin is placed on the rubbing cloth, and a hand or a tool is applied to the table. If you give a coin is confirmed that the trap is formed in the moving direction proceeds the winding process, which is limited to carry out corresponding to the front of the rubbing cloth, so that the entire inspection through the present invention to test the data of each inspection item You can get into management. In addition, the key issue is how to make very small rolls or utensils without eccentricity or deflection so as to open minute spacings. Therefore, the core technology is to design the structure that can secure the positional stability in the inspection area of the inspection device. The longer the length of 3 of the representation is, the more eccentricity and curvature occur. This can be corrected through 4 of the representation. The interior of figure 4 is characterized by the inclusion of accessories such as balls, discs, etc., which can support the figure 3 of the representation, or figure 3 of the representation includes an instrument or a surface machined like an arc.

In the form in which the rubbing cloth (7 in FIG. 3) is spread on a horizontal support (8 in FIG. 3) (FIG. 1), the inspection angle (2 in FIG. 3) from the inspection apparatus (FIG. 3) as in A of FIG. Even if the inspection area (3 in FIG. 3) is secured, it is impossible to know the direction of the shot. Therefore, when the rubbing cloth (9 in FIG. 3) is placed on the curved support (10 in FIG. 3), the inspection device (4 in FIG. 3) is moved from the inspection angle (5 in FIG. 3) to the inspection area (6 in FIG. 3). It is very easy to check the angle at which the trappings lay (2 in Fig. 2), such as 1 in 2, and it is possible to sufficiently calculate the missing or flaw. In order to secure the inspection area to derive the test results, the bending angle of the support or the roll (10 in FIG. 3) must be present. 5,6,7), the horizontal precision of the support or roll (3 in the diagram) should be about several hundred micrometers or less, and the mechanism (4 in the diagram) to correct the eccentricity is needed. Air suction holes or grooves are machined in each tool to catch the swelling of the fabric and the rubbing cloth is absorbed and corrected through it, and the end of the rubbing cloth through the standard alignment line and alignment guide to evenly transport the large area rubbing cloth. It is composed of a device that holds the whole, and the rubbing cloth is moved to the left and right when the conveying guide is held by the alignment guide. In addition, the inspection device (8 in the diagram) is configured with a conveying device (12 in the diagram) in the long axis direction of the roll or the support (3 in the diagram) to perform the rubbing cloth full surface inspection. In case of front inspection, if data of 3D capture direction is needed, 3D camera or camera and sensor using laser method can be used.In 2D inspection, rubbing cloth is inspected more than once in orthogonal direction or different directions. This involves obtaining the three-dimensional orientation of the trap. Since the width of the rubbing cloth is different, it can be implemented including a transport mechanism (13, 14 of the representation) that can be adjusted according to the width.

1 is a drawing of the rubbing cloth spread out on a horizontal plane.

2 is a diagram illustrating a case in which the bundle of the rubbing cloth is lying in a certain direction.

FIG. 3A is a diagram representing a difficult limit when measuring the direction and inspection items of the bundle in a horizontal plane and B is a view representing a state in which the inspection space is secured by spaced apart the bundle of bundles on the curved surface to enable inspection.

Claims (14)

As a method for checking the direction of the shot (1 in FIG. 2), the angle (2 in FIG. 2), and the deflection of the bundle (2 in FIG. 1), the distance between the bundles of the guns along the curved surface is used. (B) A method of trapping, incorporating one or more inspection devices, such as sensors, three-dimensional cameras, or slit laser three-dimensional cameras. With angle-forming mechanisms (3 in the representative diagram) small enough in diameter to enable inspection devices to form inspection angles for inspection of the bundle If the angle-forming device (3 in the diagram) is longer, the center is oriented downwards, including a stone platform or a supporting object to compensate for this. It includes a form in which air intake grooves or holes are dug to prevent the rubbing cloth from crying on the utensil (5 in the diagram) or to adhere the rubbing cloth to the utensil. Includes vertical tilting of angle-forming mechanism (3 in the diagram), tilting and eccentricity in the horizontal direction, and mechanisms for reducing and correcting the coefficient of friction (4 in the diagram) With guide rolls or fixtures (6 in the diagram) to maintain the inspection angle of the inspection device Machined air intake grooves or holes to prevent rubbing of rubbing cloths on guide rolls or utensils (6 in the diagram) In order to prevent contact with the upper surface of the effective area of the rubbing cloth (actual part to be used), a guide roll or a mechanism (7 of the representative drawing) is attached to the area other than the effective area with the upper surface of the rubbing cloth guide roll (represented in Figure 7). Comprising a conveying device (1 in the diagram) for uniformly conveying the rubbing cloth and a mechanism (2 in the representative diagram) or a device for uniformly holding the rubbing cloth It includes a device capable of displaying the baseline or baseline for aligning the rubbing cloth between each device in the representative view or between the devices in the representative view, even when the rubbing cloth is transported and installed. It is equipped with a rubbing cloth alignment guide mechanism or an alignment inspection device between each of the instruments or instruments in the representative view because the rubbing cloth should not be tilted when uniformly transported and installed. It has the effect of representative figure 3 and representative figure 4, and includes angle forming mechanism (stone or metal workpiece, etc.) made to be arc or curved enough for the inspection device to form the inspection angle to enable inspection of gun bundle. In the case of the front inspection, the spacing between the bundles is spaced along the surface in order to check the direction of the gun (1 in FIG. 2), the angle (2 in FIG. 2), and the bundle of the gun (2 in FIG. 1). Including the rubbing cloth two or more times in the orthogonal direction or different directions to obtain the three-dimensional direction of the trapping. It includes the one equipped with the transfer mechanism (13 and 14 in the diagram), which can adjust the mechanism (1, 7 in the diagram) according to the width of the rubbing cloth during the inspection.

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