JPS62237430A - Method for producing liquid crystal element and oriented film therefor - Google Patents

Abstract

PURPOSE:To manufacture uniform oriented films and to eliminate defects and uneven orientation by using the oriented film having rugged structure on the greater part of the shape on the surface for at least one of the oriented films provided on substrates or films. CONSTITUTION:This liquid crystal display element is constituted of the glass substrates 1 disposed to face each other, transparent electrodes 2 provided on the opposed surfaces of the glass substrates 1, the oriented films 3 provided on the opposed surfaces of the transparent electrodes 2, a spacer 4 provided between the glass substrates 1, a liquid crystal 5 sealed in the space partitioned by the glass substrates 1 and the spacer 4, polarizing plates 6 provided on the outside of the glass substrates 1 and a reflective plate 7 provided on the outside of the one polarizing plate 6. The greater part of the shape on the surface of at least one oriented film provided on the substrates or film has the rugged structure from 0.1nm up to 100nm depth in the direction perpendicular to the substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid crystal display element using a new alignment film and a method for manufacturing the alignment film.

[Summary of the invention]

This invention makes it possible to produce a uniform alignment film by using an alignment film provided on a substrate or film, in which a large part of the surface of one of the alignment films has an uneven structure. Therefore, it is possible to create a liquid crystal display element with almost no defects or alignment unevenness compared to liquid crystal display elements that use alignment films that have been produced so far (for example, alignment films made by rubbing method or oblique evaporation method). shall be.

The present invention also provides a method for developing a thin film material or a solution containing the same on a liquid surface to form a thin film, depositing one or more layers on the substrate or film, and removing part or all of the one or more types of thin film materials that have been deposited. By manufacturing the alignment film, it is possible to manufacture a large-area liquid crystal display element with high productivity and fewer defects and uneven alignment.

[Conventional technology]

Conventionally, alignment films manufactured by vapor deposition, sputtering, rubbing, etc. have been known as alignment films.

[Problem that the invention seeks to solve]

However, with alignment films using conventional vapor deposition and sputtering methods,
When the area of a liquid crystal display element is increased, a problem arises in that the adhesion angle of the alignment film material varies greatly on the substrate or film, resulting in uneven alignment. Furthermore, since a large-sized vacuum device is used, there is a problem in that it cannot be manufactured with high productivity.

An alignment film using a rubbing method has a problem in that when the area of a liquid crystal display element becomes large, it is very difficult to rub the substrate or film uniformly, resulting in uneven alignment. Furthermore, since it is very difficult to uniformly rub the substrate or film, there is a problem in that the strongly rubbed transparent electrode may peel off, causing display defects.

Therefore, the present invention aims to solve the above-mentioned problems and to manufacture a large-area liquid crystal display element with almost no defects or alignment unevenness with high productivity.

[Means for solving problems]

(b) The shape of most of the surface of at least one alignment film is
Depth 0.1 na+ to 10°n- in the direction perpendicular to the substrate
A liquid crystal display element was manufactured by creating a concavo-convex structure.

(b) Most of the surface of the alignment film was made to have an uneven structure with a depth of one or two molecular layers of the molecules used in the alignment film, and a liquid crystal display element was manufactured.

(c) The alignment film is a monomolecular film, a bimolecular film, or an accumulated film thereof, and a liquid crystal display element is manufactured.

(d) A thin film material or a solution containing the same is spread on the liquid surface to form a thin film, one or more layers are deposited on a substrate or film used for a liquid crystal display element, and a part of the deposited thin film material is removed to create a uniform film. The method for manufacturing at least one of the alignment films is as follows.

(e) When attaching one or more thin films on the liquid surface to the substrate or film of a liquid crystal display element, the thin film on the liquid surface should be a monomolecular film or a bimolecular film, and the thickness of the alignment film should be adjusted extremely accurately. And we made it possible to make it thinner.

(f) When attaching a thin film on the liquid surface of 1 m or more to the substrate or film of a liquid crystal display element, the substrate is moved up and down on the liquid surface while compressing the liquid surface and applying surface pressure. .

[Effect]

With (a), it has become possible to obtain a liquid crystal display element with uniform and high alignment.

With (b), it has become possible to obtain a liquid crystal display element with extremely high alignment.

(C) With (E), the alignment film no longer affects the drive voltage of the liquid crystal display element.

By (d), unevenness could be produced uniformly, easily, and with high productivity on a large-area substrate or film, and an excellent alignment film could be obtained.

(f) has made it possible to produce a more uniform alignment film over a larger area with higher productivity.

〔Example〕

This invention will be explained below using drawings and examples.

Embodiment 1 FIG. 1 shows an embodiment of a liquid crystal display element according to the present invention, in which glass substrates 1 are arranged opposite to each other, transparent electrodes 2 provided on opposing surfaces of the glass substrates 1, and further the transparent electrodes 2
an alignment film 3 provided on opposing surfaces, a spacer 4 provided between the glass substrate 1, a liquid crystal 5 sealed in a space partitioned by the glass substrate 1 and the spacer 4, and the glass substrate 1. 2 is a cross-sectional view of a liquid crystal display element comprising a deflection plate 6 provided on the outside of the polarization plate 6 and a reflection plate 7 provided on the outside of one of the deflection plates 6. FIG.

FIG. 2 shows the state of the alignment film in FIG. 1, and shows the state of the alignment film shown in FIG. FIG. 3 is a cross-sectional view of the vicinity of the alignment film.

The shape of most of the alignment film surface is perpendicular to the substrate.
It has a concavo-convex structure with a thickness of 20 nm starting from the second layer m.

Embodiment 2 FIG. 3 is an embodiment showing a method for manufacturing the alignment film shown in FIG. FIG. 2 is a cross-sectional view of the case where a transparent electrode 2 is attached onto a glass substrate 14 on which a transparent electrode 2 is provided while applying pressure with a barrier 13 provided above.

A part of the surface of the attached thin film was removed to provide an alignment film.

Embodiment 3 FIG. 4 shows an embodiment of a liquid crystal display element according to the present invention, in which glass substrates 1 are arranged facing each other, transparent electrodes 2 are provided on the opposing surfaces of the glass substrates 1, and glass substrates 1 and transparent The insulation H15 provided on the surface facing the electrode 2 and the insulation film 1
5 A cross-sectional view of a liquid crystal display element consisting of an alignment film 3 provided on opposing surfaces, a spacer 4 provided between the glass substrate 1, and a liquid crystal 5 sealed in a space partitioned by the glass substrate 1 and the spacer 4. It is.

Example 4 FIG. 5 is an example showing a method for manufacturing the alignment film shown in FIG. 2 is a cross-sectional view in the case of adhering it onto a glass substrate 14 provided with a.

〔Effect of the invention〕

As explained above, the present invention makes it possible to manufacture, with high productivity, a large-area liquid crystal display element having a uniform alignment film with almost no defects or alignment unevenness. Furthermore, since the thickness of the alignment film can be set extremely accurately and thinly, the alignment film can be prevented from affecting the drive voltage of the liquid crystal display element.

[Brief explanation of drawings]

1 is a cross-sectional view showing one embodiment of a liquid crystal display element according to the present invention, FIG. 2 is a cross-sectional view showing the vicinity of the alignment film in FIG. 1, and FIG. 3 is a cross-sectional view showing the alignment film according to the present invention. FIG. 4 is a cross-sectional view showing an example of a method for producing an alignment film according to the present invention. FIG. 5 is a cross-sectional view showing an example of a method for manufacturing an alignment film according to the present invention. FIG. 1-...Glass substrate 2--...Transparent electrode 3...
・−・・Alignment film 4−・−・−Spacer 5−・
・・Liquid crystal 6−・−・Deflector plate 7・−・−Reflector plate 10−・・−・Water tank 11−・・・・Liquid
12 --- Thin film material 13 --- Barrier
14...Glass substrate 15-...
Insulating film and above Applicant: Seiko Electronics Co., Ltd. 111 Figure 2 Figure 3 Figure 5

Claims (9)

[Claims] (1) At least a substrate or film arranged to face each other, a transparent electrode provided on the surface facing the substrate or film, and an alignment film provided on the surface facing the transparent electrode,
In a liquid crystal display element made of liquid crystal sealed between the substrates or films, the shape of most of the surface of at least one alignment film provided on the substrate or film has a depth of 0 in a direction perpendicular to the substrates. .1nm to 100n
A liquid crystal display element characterized by having an uneven structure up to m. (2) The liquid crystal according to claim 1, characterized in that the depth of the irregularities in the shape of most of the surface of the alignment film is the depth of one or two molecules used in the alignment film. display element. (3) The liquid crystal display element according to claim 1, wherein the alignment film is a monomolecular film, a bimolecular film, or an accumulated film thereof. (4) At least a substrate or film arranged to face each other, a transparent electrode provided on the surface facing the substrate or film, and an alignment film provided on the surface facing the transparent electrode,
In a liquid crystal display element consisting of a liquid crystal sealed between the substrates or films, at least one of the alignment films provided on the substrate or film is thinned by spreading a thin film material or a solution containing the same on the liquid surface, and forming a thin film on the substrate or film. Or, by depositing one or more layers on the film and removing a portion of the deposited thin film material, the shape of most of the surface of the alignment film is made into an uneven structure with a depth of 0.1 nm to 100 nm in the direction perpendicular to the substrate. A method of manufacturing the alignment film, characterized in that: (5) Producing the alignment film according to claim 4, wherein the thin film material or a solution containing the same is spread on the liquid surface and the thin film is a monomolecular film or a bimolecular film. Method. (6) One or more layers of 1 adhered on the substrate or film
5. A method for producing an alignment film according to claim 4, characterized in that more than one type of thin film material is dissolved in a solution, and a part or all of the thin film material is removed. (7) One or more layers of 1 adhered on the substrate or film
5. A method for producing an alignment film according to claim 4, characterized in that more than one type of thin film material is dissolved in a solution, liquefied, and part or all of the thin film material is removed. (8) One or more layers of 1 adhered on the substrate or film
5. The method for producing an alignment film according to claim 4, wherein more than one type of thin film material is dissolved in a solution, vaporized, and a part or all of the thin film material is removed. (9) At least a substrate or film arranged to face each other, a transparent electrode provided on the surface facing the substrate or film, and an alignment film provided on the surface facing the transparent electrode,
In a liquid crystal display element consisting of a liquid crystal sealed between the substrates or films, at least one of the alignment films provided on the substrate or film is coated on the liquid surface by spreading a thin film material or a solution containing the same onto the liquid surface to form a thin film. One or more layers of the substrate or film are deposited on the substrate or film by moving the substrate or film up and down on the liquid surface while compressing the top and applying surface pressure. A part of the deposited thin film material is removed and the surface of the alignment film is enlarged. The method for manufacturing the alignment film, wherein the shape of the portion is an uneven structure with a depth of 0.1 nm to 100 nm in a direction perpendicular to the substrate.