JP2003066424A - Method for manufacturing liquid crystal cell and liquid crystal cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently manufacturing a liquid crystal cell which is the liquid crystal cell for a liquid crystal display device especially for a portable use, which has a plastic substrate on the display screen side and a glass substrate on the opposite side and which is light-weight. SOLUTION: In the method for manufacturing the liquid crystal cell constructed with the plastic substrate including a polarizing plate on the display screen side and with the glass substrate on the opposite side, comprising a liquid crystal sealed in with a sealant and having a desired size, the method for manufacturing the liquid crystal cell is characterized by sealing in the liquid crystal between the plastics substrate and the glass substrate both larger than the desired size with the sealant, cutting the plastic substrate on the display screen side and simultaneously scribing the glass substrate and subsequently splitting them so as to form the liquid crystal cell having the desired size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cutting a liquid crystal cell in which a display surface side is composed of a plastic substrate including a polarizing plate and the opposite side is composed of a glass substrate, and a liquid crystal is sealed with a sealant. The present invention relates to a liquid crystal cell obtained by

[0002]

2. Description of the Related Art In recent years, liquid crystal cells have been applied to small and lightweight portable electronic devices, and in order to reduce the weight, a plastic substrate is being used as a substrate for sandwiching liquid crystal instead of glass as a substrate on the display surface side. As a method of manufacturing a liquid crystal cell using a glass substrate and a plastic substrate, a method of assembling a liquid crystal cell by cutting each member into a desired size and then bonding the members has been used. The cutting of the glass substrate is performed by forming a minute crack line on the glass surface with a scribe wheel at a desired cutting position and then applying pressure to the minute crack line to bring stress from the glass surface to the opposite side and cutting. ing. On the other hand, in the case of a plastic substrate, a cutter or cutting by laser melting is used. The method of obtaining liquid crystal cells by cutting each substrate and then bonding them together has a large number of steps and has poor production efficiency.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal cell for a liquid crystal display device used particularly as a portable device, which is a lightweight liquid crystal cell in which a display surface side is a plastic substrate and an opposite side is a glass substrate. It is to provide a manufacturing method for efficient production. Yet another object of the present invention is to
It is an object of the present invention to provide the above-described efficiently produced liquid crystal display cell.

[0004]

An object of the present invention is to provide a liquid crystal cell manufacturing method of the following (1) to (3), and (4).
Achieved by the liquid crystal cell of. (1) In a method for producing a liquid crystal cell of a desired size in which a display surface side is composed of a plastic substrate including a polarizing plate and an opposite side is composed of a glass substrate, and liquid crystal is sealed with a sealant, A liquid crystal of a desired size is formed by sealing the liquid crystal with a sealant between a plastic substrate larger than the size and the glass substrate, cutting the plastic substrate on the display surface side, and simultaneously scribing on the glass substrate and then cutting. A method for manufacturing a liquid crystal cell, which is characterized in that it is a cell. (2) The scribing depth is 0.1 μm or more 30
The method for cutting a liquid crystal cell according to (1), which has a thickness of 0 μm or less. (3) The method for cutting a liquid crystal cell according to (1) or (2), wherein the cutting is performed by any one of a cutting grindstone, a laser, a multi-wire saw, a rotary blade and a cutter. (4) In the method for producing a liquid crystal cell of a desired size in which the display surface side is composed of a plastic substrate including a polarizing plate, the opposite side is composed of a glass substrate, and liquid crystal is sealed with a sealant, A liquid crystal of a desired size is formed by sealing the liquid crystal with a sealant between a plastic substrate larger than the size and the glass substrate, cutting the plastic substrate on the display surface side, and simultaneously scribing on the glass substrate and then cutting. A liquid crystal cell manufactured by forming a cell.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The mode of the liquid crystal cell used in the present invention is not particularly limited, but TN (twisted nematic)
Type, VA (Vertical Alingment) type, HAN (Hybrid)
Aliged Nematic) type, STN (Supper Twisted Nemati)
c) type or GH (Guest Host) type is preferable. Further, the liquid crystal display device is not limited to any type such as a transmissive liquid crystal display device, an anti-transmissive liquid crystal display device, and a reflective liquid crystal display device, but a reflective liquid crystal display device is preferable.

The method of manufacturing a liquid crystal cell according to the present invention is different from the method of forming a liquid crystal cell of a desired size by first cutting each substrate into a desired size and then assembling it into a liquid crystal cell form. Since a large number of substrates are attached to each other, a plastic substrate and a glass substrate can be simultaneously cut, scribed, and cleaved to form a plurality of liquid crystal cells of a desired size, resulting in a small number of steps and excellent production efficiency. The plastic substrate in the present invention is made of plastic and may have a gas barrier layer, a transparent electrode, an antireflection or antiglare layer, a color filter, or the like,
It may be attached to a polarizing plate or a circularly polarizing plate. The thickness of the plastic substrate is from 0.1mm to 1.0m
It is preferably m.

Examples of plastics used in the present invention include polyvinyl alcohol resins, polycarbonate derivatives (Teijin Co., Ltd .: modified, copolymerized polycarbonate), cellulose derivatives (cellulose triacetate,
Cellulose diacetate), polyolefin resin (Zeon Corporation, Zeonor, Zeonex), polysulfone resin, polyether sulfone, norbornene resin (JSR Corporation: Arton), polyester resin (PET, PEN), Examples thereof include polyimide resins, polyamide resins, polyarylate resins, and polyether ketones. Among them, polycarbonate derivatives, cellulose derivatives, polyolefin resins, norbornene resins are preferable, and polycarbonate derivatives are particularly preferable.

The glass substrate may be a sorter lime glass or a non-alkali glass. Further, other layers such as a reflective electrode and a drive circuit may be formed on the glass substrate. The thickness of the glass substrate is preferably 0.1 mm to 1.0 mm. More preferably, it is 0.2 mm to 0.8 mm.

The sealant is for holding the liquid crystal, and its forming method and material are not particularly limited. The sealant is preferably formed by a printing method or a dispenser method, and the material thereof is a thermosetting resin, U
It is preferably a V-curable resin.

In cutting the liquid crystal cell in the present invention, it is preferable to cut the portion of the sealant so that the liquid crystal does not leak after the cutting. For cutting the plastic substrate and scribing on the glass substrate, the cutting grindstone described in JP-A-7-263268 may be used, or JP-A-2001-219.
No. 04, a multi-wire saw described in JP-A-5-96461, a rotating blade described in JP-A-5-249441, or cutting with a cutter. It doesn't matter. It is more preferable to cut with a cutting grindstone.

The depth of scratches on the glass surface due to scribing is preferably 0.1 μm or more and 300 μm or less, more preferably 1 μm or more and 100 μm or less, and further preferably 5 μm or more and 30 μm or less. It is preferable that after cutting the plastic and scribing the glass surface at the same time, pressure is applied to the scratches on the glass surface so that stress is reached from the glass surface to the opposite side and the glass is cut into a plurality of liquid crystal cells.

The cutting of the plastic substrate and the scribing of the glass substrate are preferably performed at the same time. Particularly preferably, the cutting of the plastic substrate and the scribing of the glass substrate can be simultaneously performed by the continuous operation of one cutting device. Moreover, the cutting of the glass substrate may be carried out separately or simultaneously with the cutting of the plastic substrate and the scribing of the glass substrate, but it is preferable to carry out the cutting at the same time. Thereby, a liquid crystal cell having a desired size can be obtained. The number of liquid crystal cells obtained by cutting depends on the substrate size and the panel size, but it is preferable to obtain two or more liquid crystal cells by cutting. It is more preferable to obtain 4 or more liquid crystal cells, and it is most preferable to obtain 100 or more liquid crystal cells. The upper limit is considered to be about 300 from the viewpoint of strength and accuracy, and about 200 is preferable.

[0013]

The present invention is described in detail below with reference to examples, but the present invention is not limited to these.

As a substrate on the display surface side, a 0.4 mm-thick plastic substrate for a reflection type liquid crystal display device, in which a color filter, a gas barrier film and a transparent conductive film are formed on a polycarbonate derivative and a circularly polarizing plate is attached, was prepared. . As a substrate on the opposite side, a glass substrate having a thickness of 0.7 mm on which a TFT array including a reflective electrode and driving polysilicon was formed was prepared. A sealant was applied to these substrates and bonded to the polyimide alignment film via a liquid crystal. Then, the sealant was cured to obtain a substrate including four sets of liquid crystal cells in which a region constituting a screen portion of the liquid crystal cell composed of a plastic substrate and a glass substrate was surrounded by the sealant. FIG. 1 is a plan view of the obtained substrate for explaining the present invention.
The portion to be cut is indicated by a wavy line. With a cutting whetstone,
Scribing is performed at the same time while cutting from the sealing agent on the display surface side of the obtained substrate, and about 10 μm is applied to the glass surface.
A scratch with a depth of m was introduced. FIG. 2 is a schematic view showing a cutting step of cutting a plastic substrate and introducing a scratch into the glass substrate. Note that FIG. 2 shows only a part of the liquid crystal elements of FIG. 1 in a simplified manner. After the above steps, pressure was applied to the scratches on the glass surface to break the glass, whereby four lightweight liquid crystal display cells could be efficiently obtained.

[0015]

According to the present invention, a lightweight liquid crystal display cell having a plastic substrate on the display surface side and a glass substrate on the opposite side can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a plan view of a substrate obtained by bonding a large-sized plastic substrate and a glass substrate of the present invention.

FIG. 2 is a schematic view showing a step of cutting a liquid crystal cell of the present invention.

[Explanation of symbols] 1 plastic substrate 2 Sealant 3 screen section 4 glass substrates 5 Liquid crystal layer 6 cutting whetstone

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Claims (4)

[Claims] 1. A method for producing a liquid crystal cell of a desired size, wherein the display surface side is composed of a plastic substrate including a polarizing plate, the opposite side is composed of a glass substrate, and liquid crystal is sealed with a sealant, A liquid crystal is sealed between a plastic substrate and a glass substrate that is larger than the desired size with a sealant, the plastic substrate on the display side is cut, and at the same time scribing is performed on the glass substrate, and then the desired size is obtained by cutting. 2. A method for manufacturing a liquid crystal cell, comprising: 2. The scribing depth is 0.1 μm
The method for manufacturing a liquid crystal cell according to claim 1, wherein the thickness is 300 μm or less. 3. The method for producing a liquid crystal cell according to claim 1, wherein the cutting is performed by using any one of a cutting grindstone, a laser, a multi-wire saw, a rotary blade, and a cutter. 4. A method for producing a liquid crystal cell of a desired size, wherein the display surface side is composed of a plastic substrate including a polarizing plate, the opposite side is composed of a glass substrate, and liquid crystal is sealed with a sealant. A liquid crystal is sealed between a plastic substrate and a glass substrate that is larger than the desired size with a sealant, the plastic substrate on the display side is cut, and at the same time scribing is performed on the glass substrate, and then the desired size is obtained by cutting. The liquid crystal cell manufactured by making into the liquid crystal cell of.