Transmissive or reflective liquid crystal display and novel process for its manufacture
First Claim
Patent Images
1. A process for the preparation of a liquid crystal display, which process comprises the steps of:
- a) providing microcups;
b) filling the microcups with a liquid crystal composition and a dispersion of a thermoset or thermoplastic precursor which has a specific gravity lower than that of the liquid crystal composition; and
c) sealing the filled microcups by hardening the thermoset or thermoplastic precursor dispersion during or after it phase separates and forms a supernatant layer above the liquid crystal composition.
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Abstract
This invention relates to liquid crystal (LC) displays comprising cells of well-defined shape, size and aspect ratio which cells are filled with a liquid crystal composition preferably containing dichroic dye(s), and novel processes for their manufacture.
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Citations
35 Claims
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1. A process for the preparation of a liquid crystal display, which process comprises the steps of:
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a) providing microcups;
b) filling the microcups with a liquid crystal composition and a dispersion of a thermoset or thermoplastic precursor which has a specific gravity lower than that of the liquid crystal composition; and
c) sealing the filled microcups by hardening the thermoset or thermoplastic precursor dispersion during or after it phase separates and forms a supernatant layer above the liquid crystal composition. - View Dependent Claims (2, 3, 4, 5, 25, 26, 27)
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6. A process for the preparation of a liquid crystal display, which process comprises the steps of:
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a) providing microcups;
b) filling the microcups with a liquid crystal composition;
c) sealing the fill d microcups by overcoating onto said liquid crystal composition a thermoset or thermoplastic precursor composition which is at least partially immiscible with said liquid crystal composition and has a specific gravity lower than that of said liquid crystal composition; and
d) hardening said thermoplastic or thermoset precursor composition. - View Dependent Claims (7, 8, 9, 10, 11, 28, 29, 30)
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12. A process for the manufacture of a liquid crystal display, which process comprises the steps of:
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a) preparing microcups on a first conductor film;
b) filling the microcups with a liquid crystal composition;
c) sealing the filled microcups; and
d) laminating the sealed microcups with a second conductor film to form a liquid crystal display. - View Dependent Claims (13, 15, 16, 19, 31, 32)
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14. A process for the manufacture of a multi-color liquid crystal display, which process comprises the steps of:
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a) preparing microcups on a first conductor film;
b) laminating the microcups with a layer of a positive photoresist;
c) imagewise exposing the positive photoresist to selectively open the microcups in a predetermined area;
d) filling the opened microcups with a liquid crystal composition of a first color;
e) sealing the microcups filled with the liquid crystal composition of the first color;
f) repeating Steps c) to e) in different areas with liquid crystal compositions of different colors to generate groups of microcups filed with the liquid crystal compositions of different colors;
g) removing residual positive photoresist, if any; and
h) laminating the sealed microcups with a second conductor film to form a multi-color liquid crystal display. - View Dependent Claims (17, 18, 20, 21, 22, 23, 24, 33, 34, 35)
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Specification