Method of manufacturing a liquid-crystal cell

Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly

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Details

445 25, H01J 926, H01J 924

Patent

active

051083329

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a method of manufacturing a liquid-crystal cell and more particularly to a method of preparing and placing liquid-crystal material into the liquid-crystal cell.
2. Description of the Prior Art
DE 35 32 486 A1 discloses a method of manufacturing a liquid-crystal cell in which a spacer is positioned on a first substrate and in which the liquid crystal is then printed onto the substrate within the spacer. Thereafter, the liquid-crystal cell is sealed with a second substrate.
The prior art method has the disadvantage that widely varying amounts of liquid-crystal material must be printed onto the substrate.


SUMMARY OF THE INVENTION

It is object of the invention to provide a method of manufacturing a liquid-crystal cell into which the liquid-crystal material can be introduced in a simple manner and in a precisely defined quantity.
This object is attained using a method of manufacturing a liquid-crystal cell of the type having a first substrate, a bordering means on the first substrate, a second substrate covering the first substrate and the bordering means, and a liquid phase liquid-crystal disposed in a space between the substrates and the bordering means. The method includes the steps of cooling the liquid phase liquid-crystal material to a temperature lower than 20.degree. C. below the melting point of said liquid-crystal material so that the material solidifies. The material is then ground to a grain size of less than 50 micrometers after which the material is sprinkled into the space between the first substrate and the bordering means. The liquid-crystal material is dried to remove any moisture that may have accumulated during the cooling step and afterwards the liquid-crystal cell is sealed with the second substrate in a vacuum. In a final step the liquid-crystal material is heated to a temperature above the clearing point of the liquid-crystal material so that the material is in proper condition for use in a liquid-crystal cell.


DESCRIPTION OF THE DRAWINGS

The single FIGURE of the accompanying drawing is a schematic cross section of a liquid-crystal cell.


DESCRIPTION OF THE PREFERRED EMBODIMENT

A first substrate 1 is provided with a polarizer 2 on one side, in the FIGURE on the bottom side, and with a transparent electrode 3 on the other. A spacer 4 connects the first substrate 1 with a second substrate 5. On the side facing the first substrate 1, the second substrate 5 is provided with transparent electrode 6. On the other side, the second substrate 5 supports a polarizer 7. The liquid crystal 8 is contained in the space enclosed by the substrate 1 and 5 and the spacer 4.
The substrates 1 and 5 may be made of glass, plastic, or any other suitable transparent material. They can have the dimensions of a liquid-crystal cell but may also occupy a larger area on which two or more liquid-crystal cells can be fabricated simultaneously. The spacer 4 may be a body which divides the liquid-crystal cell into several areas. In another embodiment, balls or fiber particles are present in the liquid crystal as spacing means.
In the case of thin liquid-crystal cells, or if the energizable area of the liquid-crystal cell does not include the edge regions of the liquid crystal, the two substrates may also be directly bonded together (not shown).
The liquid-crystal cell 9 can be used as a liquid-crystal display or as a light valve of an optical printer. In the reflective mode of the liquid-crystal display, a mirror is provided on the polarizer; in the transmissive mode, this mirror is not present or is folded away.
As liquid-crystal cells are known per se, further details will not be described here.
In describing the manufacture of the liquid-crystal cell 9, it will be assumed that the substrates 1, 5 were already provided, in a conventional manner, with the transparent electrodes 3, 6, insulating layers (not shown), aligning layers (not shown), and polarizers 2, 7; the polarizers may also be attached later.
The spacer 4 is pos

REFERENCES:
patent: 3494498 (1983-07-01), Kastelic
patent: 3698449 (1972-10-01), Sorkin et al.
patent: 4464134 (1984-08-01), Lackner et al.
patent: 4786268 (1988-11-01), Zondler et al.

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