JPS6146932A - Rubbing device of oriented film for liquid crystal display - Google Patents

Abstract

PURPOSE:To obtain sufficiently orientation control force even if an applied pressure is small, by sticking base ends of many fibers which have formed many projections of an acute angle adjacently in the peripheral direction, to a supporting member which is driven so as to move to an oriented film. CONSTITUTION:Many projections 3 formed adjacently on the peripheral wall of a fiber 2 have a triangular section, the tip angle of the projection is <=60 deg., and it is projected sharply to the outside. A lapping device is formed by sticking the base end part of its fiber 2 to a supporting member 1 consisting of cloth, and a fine groove can be formed on the surface of an oriented film of a liquid crystal display device by driving the supporting member 1 so as to move relatively against the oriented film of a liquid crystal device. Accordingly, since the lapping device has a high frictional force, a groove whose orientation control force is large can be formed even if the pressure for rubbing the oriented film is small, and a life of the fiber can be extended since a small pressure will do.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rubbing device for forming rubbing grooves for orienting liquid crystal molecules in a liquid crystal display i (t).

Back R technology One method of surface treatment of the alignment film of a product display substrate in order to obtain the required liquid crystal alignment is to rub the surface with a cloth.
There is a so-called rubbing method. The rubbing cloth consists of a support member and a number of short h&joints to which the base Ra is secured. In the prior art, the fibers have a smooth cylindrical shape, as shown in a perspective view in FIG. 5 and a cross section in FIG. i6. Further, a perspective view is shown in FIG.
Fibers having a generally triangular cross-section, the cross-section of which is shown in the Figure, may also be used. Its am length is 3~41
There are cases in which the surface treatment of the alignment film is carried out without applying much pressure, and cases in which the treatment is carried out under high pressure with the fiber length set at about 1 to 1.5 mm.

The former method is a method in which the life of the rubbing cloth is emphasized without requiring a strong alignment regulating force, and the latter is a method in which a strong alignment regulating force is required.

Problems to be solved by the invention In the M&Red shape as in the prior art, if the pressure applied when rubbing the alignment film is small, sufficient alignment regulating force cannot be obtained, and depending on the selection of materials for the liquid crystal and alignment film, the so-called Disclination and induced domains occur. Also, sufficient orientation standard♂1
If the rubbing is performed under high pressure in order to obtain 1 force, the fibers will be severely abraded, and there is a problem that the rubbing cloth will not last long.

An object of the present invention is to solve the above-mentioned technical problems and to provide a rubbing device for alignment films for liquid crystal displays, which can obtain a sufficient alignment regulating force even if the applied pressure is small.

Means for Solving the Problems The present invention provides a rubbing device 1 for forming rubbing grooves in an alignment film for a liquid crystal display, which includes a support member that is driven to move relative to the alignment film. and a large number of fibers, the base end of which is fixed to the support member, a large number of protrusions extending in the axial direction are formed adjacent to each other in the circumferential direction, and the outer ends of the protrusions are at acute angles. This is a rubbing device for alignment films for liquid crystal displays.

Function According to the present invention, the proximal end is fixed to the support member, and a large number of protrusions extending in the axial direction are formed on the outer periphery, and the outer rim has an acute angle, so that sufficient orientation control can be achieved with a small rubbing pressure. You can gain power.

Embodiment FIG. 1 is a perspective view of a fiber #12 whose proximal end is fixed to the support member 1 (shown in FIG. 3) of the rubbing device of the present invention, and FIG. FIG. A large number of protrusions 3 are formed adjacent to each other on the peripheral wall of the fiber 2 .

The protrusion 3 has a generally triangular cross section and extends in the axial direction of the fiber 2. The outer end portion 3a of the protrusion 3 sharply projects outward so that the tip angle θ is 60 degrees or less. The diameter of the fiber 2 is about 20 μm, and the height H of the protrusion 3 is about 1 μm. Moreover, as the material, rayon, nylon, etc. are suitable.

Pt53 diagram is a cross-sectional view of rubbing *i. A rubbing device is formed by making the lengths of the fibers 4112 as described above as short as 2 to 4-1, and fixing their base portions to the support member 1 made of cloth.
(FIG. 4 is a cross-sectional view of a liquid crystal display device. 1y, the crystal display device g11 is composed of a liquid crystal 8 sealed between substrates 6° 7 on which transparent electrodes 4 and 5 are formed. In order to prevent a phenomenon called disclination from occurring due to the alignment direction of the molecules of the liquid crystal 8 when an electric field is applied, an alignment film 9.10 made of synthetic W* such as polyimide is coated on the surface of the substrate 6.7. is formed.Orientation IK9.
- It is necessary to form a fine groove with polarity in 1o to orient the molecules of the liquid crystal 8 in one direction. This orientation groove is formed by fixing the rubbing device of the present invention to the surface of the flexible body, for example, and driving and rubbing the rubbing device so as to move it relative to the orientation 19+to.

The following Table 1 is a table showing a comparison between the present invention and the prior art based on experiments conducted by the present inventor.

(The following is a blank space) As is clear from Table 1, "Settings," the present invention has a high frictional force, and even if the pressure for rubbing the alignment film is small, it is possible to form grooves with a large alignment regulating force.

Therefore, it is possible to increase the number of times the rubbing equipment can be used.
LCD display device! It is possible to reduce the amount of time spent in the shipping process.

Effects As described above, according to the present invention, even if the pressure of rubbing the alignment film is small, alignment grooves with a large force regulating the alignment of liquid crystal can be formed, and the life of the fiber can be improved. .

4. Brief description of the drawings FIG. 1 is a perspective view of the fiber 2 of the present invention, FIG. 2 is a sectional view taken from the cutting plane line ■-■ in FIG. 1, and FIG. 3 is a sectional view of the present invention. FIG. 4 is a sectional view of a liquid crystal display device, FIG. 5 is a perspective view of a conventional fiber, and tj46 is a cross-sectional view of a liquid crystal display device, and FIG.
FIG. 7 is a perspective view of another embodiment of the prior art fiber, and FIG. 8 is a sectional view as seen from V+. It is a sectional view taken from the cutting plane line ■-■ in Figure @7.

1...Supporting member, 2...Fiber, 3...Protrusion agent Patent attorney Shikyo Keibu No. 3121 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] A rubbing device for forming a rubbing groove in an alignment film for a liquid crystal display, comprising: a support member that is driven to move relative to the alignment film; and a base end portion of the support member. A rubbing device for an alignment film for a liquid crystal display, comprising a large number of fibers in which a large number of protrusions that are fixed and extend in the axial direction are formed adjacent to each other in the circumferential direction, and the outer ends of the protrusions are at acute angles. .