JPS6266227A - Sticking method of polarizing plate - Google Patents

Abstract

PURPOSE:To decrease the occurrence of the roller foam and to enhance the displaying quality of the liquid crystal device by reducing the contacting area and the pressure when the roller lands on the polarizing plate. CONSTITUTION:While to one edge side 101 of a polarizing plate 10 corresponding to the forward direction 24 of a roller 23, a shaft 231 of the roller 23 is inclined to an angle theta2, for example, 100 deg. which is a scope excluding 89 deg. to 91 deg., the roller 23 is stuck, pressurized and pressed to one edge of a polarizing plate 10. By shifting the roller 23 from a position A to start sticking to a position B to end sticking, the polarizing plate 10 is stuck to the main body of a liquid crystal displaying device 20 and after the ending, the roller 23 is returned to the original position A by a spring, etc. Thus, when the roller 3 is stuck, pressurized and pressed, the contacting area of the roller 23 and the polarizing plate 10 comes to be smaller, the roller foam to occur due to the landing of the roller 23 can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for attaching a polarizing plate having a light polarizing effect to a liquid crystal display body.

[Technical background of the invention and its problems]

When attaching the polarizing plate to the liquid crystal display body, care must be taken to prevent bubbles from forming between them in order to prevent deterioration of the appearance quality.

FIG. 6 is a diagram showing an example of a conventional method for gluing polarizing plates. In the figure, the liquid crystal display (G) is made by filling the gap between the upper plate ■ and the lower plate ■ with liquid crystal material, and pasting the polarizing plate ■ onto the upper plate ■ using a rubber roller for gluing (A). It represents the state of attachment. That is, one end of the polarizing plate (2) is pressed against a predetermined end of the upper plate (2) using a roller (2), and the roller (A) is moved in the direction of the arrow 0 with the same bonding pressure to perform the gluing.

Note that the angle θ between the axis of the roller and the edge of the polarizing plate 0 is 90 degrees.

The state of the roller (a) at this time is as shown in FIG. In other words, a polarizing plate ■ is placed on a table ■ that has a vacuum suction function.
is adsorbed, and the end of the polarizing plate (2) is positioned so as to be in contact with the roller (A). In this state, the polarizing plate 0 is pressed against the end of the fixed liquid crystal display (2). At this time, the adhesive of the polarizing plate ■ adheres to the liquid crystal display ■, and by moving the roller (a) in the direction of the arrow ■, the polarizing plate ■ By the way, the roller (a) at this time lands on the liquid crystal display ■ When this happens, distortion occurs on the surface of the polarizing plate (■), and dot-like bubbles (■) (hereinafter referred to as roller bubbles) that are continuous in the axial direction of the roller (A) as shown in Figure 8 are generated. . This roller foam (9) deteriorates the appearance and becomes one of the causes of deterioration of display quality.

[Purpose of the invention]

'>The present invention was made in view of the above situation, and an object of the present invention is to provide a method for gluing polarizing plates, which makes it possible to obtain a liquid crystal display with good display quality.

[Summary of the invention]

That is, in the present invention, the roller is attached to one end of the polarizing plate with the axis of the roller tilted in a range excluding 89° to 91° with respect to one edge of the polarizing plate corresponding to the direction of travel of the roller. This method of gluing a polarizing plate is characterized in that the polarizing plate is bonded to a liquid crystal display main body by pressing with additional pressure and moving a roller.

In addition, the present invention is capable of polarizing light by pressing a roller against one end of a polarizing plate with a very small pressure that does not cause roller bubbles, then shifting the roller so as to separate it from the polarizing plate, and moving the roller while applying pressure. This is a polarizing plate gluing method characterized by gluing a plate to a liquid crystal display body.

[Embodiments of the invention]

The details of the present invention will be explained below with reference to the drawings.

FIG. 5 is an enlarged sectional view showing an example of a polarizing plate (10) used in the present invention. In the figure, the polarizer (11) is made of a material having, for example, a triacetyl cellulose film and a polyvinyl alcohol film adsorbed with iodine. A protective film (11) made of polyethylene, for example, is placed on the main surface of the polarizer (11) to protect it.
2) is attached via a weak adhesive layer (13). Further, on the other main surface of the polarizer (11), for example, an acrylic adhesive (14) with good transparency and strong adhesive force is applied, and this is protected by a separator (15).

Next, one embodiment of the present invention will be described with reference to FIG. In the figure, the liquid crystal display (20) has an upper plate (21) and a lower plate (
The upper plate (21) is formed by filling the gap of 22) with liquid crystal material.
Place the polarizing plate (10) on top using the gluing roller (23).
It represents the state of gluing. That is, the roller (23
) of the axis (23) of the roller (23) relative to one edge (101,) of the polarizing plate (10)
1) is tilted to an angle θ2 of, for example, 100'', which is a range excluding 89° to 91', and press the roller (23) against one end of the polarizing plate (10) with adhesive pressure. ) from the starting position A to the ending position B, the liquid crystal display (20
) The polarizing plate (10) is pasted on the main body of the device (23), and after completion, the roller (23) is returned to the original position A using a spring or the like.

In this embodiment, with the axis (231) of the roller (23) tilted by an angle θ2 with respect to one end side (101) of the polarizing plate (10), the roller (23) is attached to one end of the polarizing plate (10). Therefore, the contact area between the roller (23) and the polarizing plate (10) when pressing with the application pressure is reduced, and it is possible to reduce roller bubbles generated due to the roller (23) landing. . Note that the angle θ2 is set from 70'' to 89' or from 91@ to 110@ because it is effective to make the device smaller by passing the roller (23) as short as possible over the entire surface of the polarizing plate (10). It is desirable that it be within the range.

[Other embodiments of the invention]

Further, another embodiment of the present invention will be described using FIG. 2. In this figure, parts corresponding to those shown in FIG. 1 are given the same reference numerals. As shown in the figure, a polarizing plate (10) is adsorbed on a table (30) having a vacuum suction function, and one end of the polarizing plate (1o) is attached to a roller (23).
It is located so that it is in contact with. And polarizing plate (10)
A polarizing plate (1
0) and the liquid crystal display (20) with a very small pressure that does not cause roller bubbles. Next, the roller (23
) to the position shown in (231) so that it is removed from the polarizing plate (10), and then moving the roller (23) with the application pressure increased to the application pressure to remove the polarizing plate (10) from the liquid crystal display. Attach it to the main body of the display (20).

In this embodiment, the roller (23) is connected to the liquid crystal display (20).
) Since the pressure upon landing on the polarizing plate (10) is very small, the distortion of the surface of the polarizing plate (10) is small at this time, and the generation of roller bubbles can be reduced compared to the conventional method.

By the way, until now we have mainly been thinking about reducing the generation of roller bubbles, but from the perspective of preventing deterioration in display quality, it is important to move the generated roller bubbles to the edges as much as possible so that the appearance quality is not impaired. You can do it like this. That is, for example, as shown in FIG.
) When attaching the polarizing plate (10) to the roller (2), place the polarizing plate (10) on the roller (2), bringing the roller foam to the very edge.
3), the adhesive side of the polarizing plate (10) will be on the lower plate (22) when attaching the polarizing plate (10) to the lower plate (22) as shown in Figure 4. If there is no proper contact, gluing may not be possible. These are the upper plate (21) and lower plate (22) of the liquid crystal display (20).
Due to the step.

This is because the pressure on the lower plate (22) is apparently lower. Therefore, when attaching the polarizing plate (10) to the lower plate (22), it is sufficient to increase the pressure applied by the pressure arm.

〔Effect of the invention〕

As explained above, the polarizing plate gluing method of the present invention is as follows:
By reducing the contact area and pressure when the roller lands on the polarizing plate, the generation of roller bubbles can be reduced and the display quality of the liquid crystal display can be improved.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining one embodiment of the present invention. FIG. 2 is a diagram for explaining another embodiment of the present invention, and FIG.
4 and 4 are diagrams for explaining still another embodiment of the present invention, FIG. 5 is an enlarged sectional view showing an example of a polarizing plate used in the present invention, and FIGS. 6 to 8 are diagrams for explaining a conventional polarizing plate. It is a figure which shows an example of the method of gluing a board. (10)...Polarizing plate (20)...Liquid crystal display (23)...Roller agent Patent attorney Norio Chika Ken Yudo Ogo Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8

Claims (3)

[Claims] (1) With the axis of the roller tilted in a range excluding 89° to 91° with respect to one edge of the polarizing plate corresponding to the direction of travel of the roller, place the roller at one end of the polarizing plate. A method for gluing a polarizing plate, characterized in that the polarizing plate is bonded to a liquid crystal display main body by pressing with adhesion pressure and moving the roller. (2) The range of tilting the axis of the roller is from 70° to 11°.
2. The method for gluing a polarizing plate according to claim 1, wherein the angle is up to 0°. (3) After pressing a roller against one end of the polarizing plate with a slight pressure, the roller is shifted so as to be removed from the polarizing plate, and by moving the roller while applying pressure, the polarizing plate is attached to a liquid crystal display. A method of gluing a polarizing plate, which is characterized by gluing it to a main body.