JPH0239026A - Manufacture of liquid crystal display - Google Patents

Abstract

PURPOSE:To firmly fix a gap holding member and to improve a display quality by sprinkling a gap holding member to the substrate member of one side, temporarily fixing it and filling a gap formed of a pair of substrate members with a liquid crystal. CONSTITUTION:A spacer 25, namely, the gap holding member is sprinkled on a substrate member 22 of one side and temporarily fixed with a base coating film or a resin applied on the gap holding member 25. Next, the gap holding member 25 is coated, an orientation control film 26 is formed, the gap holding member 25 is fixed to the substrate member 22 of one side, and thereafter, a substrate member 23 of the other side is fixed to the substrate member 22 of the other side. The gap formed of a pair of the substrate members 22 and 23 is filled with the liquid crystal. Consequently, the gap holding member 25 can be firmly fixed to the substrate member 25 of one side, and the movement of the gap holding member 25 is eliminated. Thus, a display defect cannot be generated by scarring the surfaces of orientation control films 26 and 36, etc., and the display quality can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a liquid crystal display device, and more specifically, a method for manufacturing a liquid crystal display device, and more specifically, a method for dispersing gap retaining members in a liquid crystal layer to make the thickness of the liquid crystal layer uniform over the entire display area. The present invention relates to a method of manufacturing a liquid crystal display device that maintains a constant temperature.

One branch of the Eastern Jutsu A typical prior art is shown in FIG.

I on one surface of the transparent substrate 1 made of a material such as glass.
The transparent electrode 2 is formed by patterning a TO (Indium-Tin-Oxide) film or the like. Furthermore, an alignment control film 3 such as a polyimide film is formed to cover the transparent electrode 2 and the surface of the transparent substrate 1 exposed on the transparent electrode 2 side, and an alignment treatment is performed by rubbing.

Self-alignment control (A pattern of transparent full 5 is formed on the surface of the transparent substrate 4 facing the alignment control film 3, which is disposed opposite to the film 3, and the transparent T of the transparent electrode 5 and the transparent substrate 4;
15 (II), an orientation control WA6 is formed by covering the exposed surface, and an orientation treatment is performed.

Transparent 2! Board 1. Transparent electric F! ii2, and alignment control film 3
In one substrate member 7, spacers 8 made of a plastic material or the like and processed into a perfect spherical shape are scattered on the alignment control film 3. In addition, in the substrate member 9 on the other side including the transparent substrate 11, the transparent electrode 5, and the orientation 1111 6, etc., a sealing resin 10 is printed or formed on the peripheral edge of the surface on the transparent electrode 5 side. . In this state, the pair of substrate members 7.9 are pressurized in a direction toward each other so that their orientation control films 3.6 face each other, and the sealing resin 10 is heated and hardened so that they are fixed to each other. be done. In this way, the pair of substrate members 7.
For example, a nematic liquid crystal 11 is filled in the gap formed by the transparent substrate 1.4, and polarizing plates 12 and 13 are respectively disposed on the outer surface of the transparent substrate 1.4 in the stacking direction.
A twisted nematic (twisted nematic) mode liquid crystal display device is constructed.

In a TN mode liquid crystal display device, the light transmittance changes depending on the layer thickness of the liquid crystal layer, so if this layer thickness is not kept uniform over the entire display chain of the liquid crystal display device, good display quality cannot be achieved. can't get it.

For this reason, for example, in a large liquid crystal display device, a spacer 8 as described above is interposed between the substrate members 7 and 9, and the thickness of the liquid crystal layer is maintained at a desired value by this spacer 8. .

Problems to be Solved by the Invention When the liquid crystal display device shown in FIG. 2 is used, for example, in a vehicle, the spacer 8 moves due to vibration. At this time, the spacer 8 scratches the alignment control film 3.6, making it impossible to maintain the molecular alignment of the liquid crystal 11 in the desired state at the scratched portion. For example, in a transmissive liquid crystal display device, this causes display defects in the form of scratches.

In order to prevent the spacer 8 from moving due to vibration as described above, it is necessary to fix the spacer 8 to the substrate member 7. This method includes applying an adhesive to the surface of the spacer 8, scattering the spacer 8 on the substrate member 7, and fixing the spacer 8 on the alignment control film 3 with the adhesive, or using an alignment control roll film. Spacer 8 in the precursor solution of 3
An example of a method is to mix the precursor solution with the above solution, print the precursor solution, and then bake it to form the alignment control film 3, thereby fixing the spacer 8 to the substrate member 7 using the alignment control film 3.

However, in the former method, it is not possible to increase the thickness of the adhesive layer applied to the surface of the spacer 8, so the adhesiveness between the spacer 8 and the alignment control film 3 is small, and the adhesive strength is sufficient to withstand vibrations. However, in the latter method, it is very difficult to uniformly disperse the spacers 8 on the surface of the plate member 7 when printing the precursor solution for the oriented silicon film 3. There is a point.

An object of the present invention is to solve the above-mentioned technical problem, and to make it possible to uniformly distribute and firmly fix the gap retaining member to one substrate member, thereby degrading display quality due to movement of the gap retaining member. It is an object of the present invention to provide a method for manufacturing a liquid crystal display device, which does not cause the occurrence of problems, and allows the thickness of the liquid crystal layer to be reliably selected to a desired value, thereby significantly improving display quality.

Means for Solving the Problems The present invention provides a method for distributing a gap retaining member on one substrate member to lower tf! A coating film or a resin applied to the gap retaining member is temporarily fixed, the gap retaining member is covered to form an orientation control ma, and the gap retaining member is fixed to the one substrate member, and then the other substrate member is fixed. A method for manufacturing a liquid crystal display device, characterized in that: a substrate member is fixed to the one substrate member, and a gap formed by the pair of substrate members is filled with liquid crystal.

Function: In the present invention, the gap retaining member is spread and attached to one of the X-plate members. An alignment control film is formed by covering the bonded gap holding member, and in this way, the gap holding member is fixed to the one substrate member. After this, the other substrate member is fixed to the one substrate member,
A gap formed by the pair of substrate members is filled with liquid crystal.

In this way, the gap retaining members are uniformly spread on one of the substrate members and temporarily fixed, and then firmly fixed to the one X-plate member by the alignment control film. Therefore, the gap holding member does not fall off from the one substrate member due to vibrations, and therefore the surface of the alignment control film is prevented from being damaged due to movement of the gap holding member. Further, as described above, since the gap maintaining members are uniformly distributed on one substrate member, the thickness of the liquid crystal layer can be made uniform over the entire display area of the liquid crystal display device.

Embodiment FIG. 1 is a sectional view for explaining a method of manufacturing a liquid crystal display device 21 according to an embodiment of the present invention.

On the transparent substrate 22 made of a material such as glass, an I T
The transparent tffi 23 is formed by patterning an O (Indium-Tin-Oxide) film or the like.

This transparent electrode 23 is covered with an insulating material 24 (for example, 5A-10 manufactured by Toyo Ink Co., Ltd.) printed, and this direct electrode 23 is coated with an insulating material 24 (for example, 5A-10 manufactured by Toyo Ink Co., Ltd.). Spacers 25 made of, for example, a plastic material and processed into a true spherical shape (for example, Microvar manufactured by Kasui Fine Gemical Co., Ltd. or Epostor manufactured by Nippon Shokubai Kagaku Co., Ltd.) are sprinkled on the surface.

After scattering the spacers 25, the insulating film 24 is fired, and in this way the spacers 25 are temporarily fixed to the surface of the insulating film 24. This state is shown in FIG. 1(1). The insulating film 24 is provided for the purpose of preventing foreign matter from entering between the negative pair of substrate members and thereby causing leakage to the liquid crystal layer.

From the state shown in FIG. 1 (1), the surfaces of the insulating film 24 and the spacer 25 are TIl-covered, and then a polyimide film (for example, LQ-1800 manufactured by Hitachi Chemical Co., Ltd.) is printed with an oriented film 26 and baked. be done.

Thereafter, the alignment control film 26 is subjected to alignment treatment by rubbing. This state is shown in FIG. 1(2).

In this way, the transparent substrate 22, the transparent electrode 23, the insulation H2
One substrate member 31 includes a control 3iI film 26, a control 3iI film 26, and the like.

the other)! In the plate member 32, a transparent 18-pole 34 is formed on one side of a transparent substrate vi33, and an insulating film 35 is formed over the transparent electrode 34 and the surface of the transparent substrate 33 exposed on the side of the transparent electrode 34. An orientation control 211 film 36 is formed to cover this insulating film 35. Such an orientation control for the substrate member 32! n film 36rfJ! A sealing resin 37 is printed on the peripheral edge of the surface. In such a state, the one substrate member 31 and the other substrate member 32,
The sealing resin 37 is heated and hardened in a state in which the orientation control WIIWs 26 and 36 are pressed in a direction in which they approach each other so as to face each other. In this way, the pair of substrate members 31, 32 are fixed to each other.

The gap formed by the substrate members 31, 32 is filled with, for example, a nematic liquid crystal 38 having positive dielectric anisotropy. The long axis direction of the liquid crystal molecules of this matic liquid crystal 38 becomes approximately parallel to the alignment processing direction in the vicinity of the alignment words 26 and 36. Orientation: llI HfF426
, 36 Odor"C, Sono alignment processing directions are selected to be perpendicular to each other, for example, so that the nematic liquid crystal 38 forms a twisted alignment with a twist angle of 90 degrees between the alignment control films 26 and 36. The twist angle can be set to less than 90 degrees or more than 90 degrees to about 360 degrees depending on the direction of the twist orientation and the helical pitch of the liquid crystal, and an electric field is applied to the liquid crystal layer through the transparent electrodes 23 and 34. The liquid crystal molecules align their long axes in the direction of the electric field and become optically isotropic.Therefore, it is possible to perform display by switching the state of light that passes through the liquid crystal layer into two types. can.

A polarizing plate 3 is provided on the outer surface of the transparent substrate 22.33 in the stacking direction.
9.40 are arranged such that their respective absorption axes directions intersect or are parallel to each other.

For example, when light enters from the tip plate 39 side, linearly polarized light defined by the absorption axis directions of the three polarizing plates enters the liquid crystal layer. At this time, when no electric field is applied to the liquid crystal layer, the linearly polarized light passes through the liquid crystal layer with its f direction being twisted in accordance with the twist angle of the liquid crystal molecules, and when an electric field is applied, the linearly polarized light passes through the liquid crystal layer. The linearly polarized light passes through the liquid crystal layer while maintaining its polarization direction. In that way, the front plate 40
The polarized light component that reaches this polarization is parallel to or intersects with the absorption axis of the polarizing plate 40. Therefore, by selectively applying a voltage to the liquid crystal layer, the polarization direction of the incident light reaching the polarizing plate 40 can be changed to switch the light, and in this way, a desired display can be performed.

In this embodiment, the spacers 25 are sprinkled on the insulating film 24 at IN after the insulating film 24 is printed and the insulating film 24 is fired. By this scattering, the spacers 25 are uniformly dispersed on the surface of the insulating film 24. Thereafter, the spacer 25 is attached to the insulating film 24 by baking with the insulating film 24. By printing and firing the orientation controlling O1 film 26 in such a state, the orientation tllll
nm26 covers the spacer 25, so to speak,
It is firmly fixed to the substrate member 31 (to the MA edge v, 24). Like this! 1, the alignment control film 26
The spacer 25 does not fall off during the t% process in which the orientation treatment is applied to the spacer 2, and the spacer 2
5 will not fall off.

Book 1! 1' The inventor produced a liquid crystal display device as described above! In contrast to 21, vibrations that continuously change between 10Hz and 60Hz and change with a period of 1 minute are
The change in display quality of the liquid crystal display device 21 was observed for 0 minutes. In this observation, no movement of the spacer 25 was detected even after the above-mentioned vibration was applied, and therefore, a scratch-like display defect caused by the spacer 25 scratching the surface of the alignment control film was observed. It has been confirmed that (no) Therefore, the liquid crystal display device 21
can be used while maintaining good display quality even under conditions of severe vibration, such as when used in a vehicle or a motorcycle.

In the above-mentioned embodiment, the spacers 25 are not distributed on the printed ridges of the insulating films 2 and 1, but in J9, where such an insulating film 24 is not used, the orientation control (one film 26
For example, the spacers 25 may be sprinkled on the printed area covering the transparent substrate 22 and the transparent electrode 23 with, for example, a polyimide film made of the material of the polyimide film. The film is fired, then a polyimide film is further printed and fired, and in this state the surface of the polyimide film is subjected to an orientation treatment. In the liquid crystal display device manufactured in this manner, the same effects as in the above-described embodiments can also be obtained.

Furthermore, as a method for temporarily fixing the spacer 25 to the substrate 31, a spacer whose surface is coated with an adhesive resin is sprinkled on one substrate member, and then heated with the adhesive resin to harden it, and then aligned. A control film may be formed. In this case, for example, an epoxy adhesive may be used as the adhesive resin, and in such a case, the epoxy adhesive may be used in an amount of The spacers may be dispersed in a fluorocarbon solvent melted by approximately 0.2 g, and the spacers may be scattered onto the substrate member 31.

Effects of the Invention As described above, according to the present invention, the gap holding member can be firmly fixed to one substrate member.

This prevents the gap retaining member from moving and therefore the orientation, tiIIIi! Display defects will not occur due to damage to the surface of the II film, and since the gap retaining member can be uniformly distributed over the entire display area of the display device, the layer thickness of the liquid crystal layer can be adjusted in each part of the display area. The liquid crystal display can be displayed uniformly, and therefore the display quality of the liquid crystal display device can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the present invention; FIG. 2 is a sectional view for explaining a method of manufacturing an α-crystal display device 21, and FIG. 2 is a sectional view for explaining a typical prior art. 21...; α crystal display device, 22.33... Transparent substrate, 23.34... Transparent double positive, 24.35... Insulating film, 25... Spacer, 26.36... Orientation control membrane,
37...Seal resin, 38...Nematic liquid crystal agent Patent attorney Number of strokes Keiichi

Claims (1)

[Claims] A gap maintaining member is spread on one substrate member and temporarily fixed with a base coating film or a resin applied to the gap maintaining member, and the gap maintaining member is coated to form an alignment control film. Then, the gap holding member is fixed to the one substrate member, and then the other substrate member is fixed to the one substrate member, and the gap formed by the pair of substrate members is filled with liquid crystal. A method for manufacturing a liquid crystal display device, characterized in that: