ELECTROPHORETIC DISPLAY AND NOVEL PROCESS FOR ITS MANUFACTURE
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Accused Products
Abstract
This invention relates to an electrophoretic display comprising cells of well-defined shape, size and aspect ratio which cells are filled with charged pigment particles dispersed in a solvent, and novel processes for its manufacture.
89 Citations
37 Claims
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1-13. -13 (Canceled)
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14. A process for the preparation of an electrophoretic display, which process comprises the steps of:
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a) filling the microcups with a dispersion of a thermoplastic precursor in an electrophoretic fluid which fluid comprises charged pigment particles dispersed in a dielectric solvent wherein said thermoplastic precursor has a specific gravity lower than that of the dielectric solvent and the charged pigment particles; and
b) sealing the filled microcups by hardening a supernatant layer formed from said thermoplastic precursor at the top of the electrophoretic fluid. - View Dependent Claims (15, 16, 17)
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18. A process for the preparation of an electrophoretic display, which process comprises the steps of:
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a) filling the microcups with an electrophoretic fluid which comprises charged pigment particles dispersed in a dielectric solvent;
b) sealing the filled microcups by overcoating onto said electrophoretic fluid a composition comprising a thermoplastic precursor which has a specific gravity lower than that of said dielectric solvent and the charged pigment particles, and c) hardening said thermoplastic precursor composition. - View Dependent Claims (19, 20)
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21. A process for the manufacture of an electrophoretic display, which process comprises the steps of:
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a) preparing microcups;
b) filling the microcups with an electrophoretic fluid which comprises charged pigment particles dispersed in a dielectric solvent; and
c) sealing the filled microcups with a thermoplastic precursor which has a specific gravity lower than that of the dielectric solvent and the charged pigment particles. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A process for the manufacture of a multi-color electrophoretic display, which process comprises the steps of:
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a) preparing microcups;
b) laminating the microcups with a layer of positive photoresist;
c) imagewise exposing the positive photoresist to selectively open the microcups in a predetermined area;
d) filling the opened microcups with an electrophoretic fluid which comprises white charged pigment particles dispersed in a dielectric solvent of a first color;
e) sealing the filled microcups with a thermoplastic precursor which has a specific gravity lower than that of the dielectric solvent and the charged pigment particles;
f) repeating steps c) to e) in different areas to generate groups of microcups filled with electrophoretic fluids of different colors; and
g) removing residual positive photoresist, if any. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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Specification