Electrophoretic display and novel process for its manufacture
First Claim
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1. A process for the preparation of well-defined and isolated cells to be used in an electrophoretic display, which process comprises the steps of:
- a) laminating a film with prepunched holes on a conductor layer;
b) filling the holes with an electrophoretic fluid comprising charged pigment suspension in a dielectric solvent or solvent mixture and a dispersion of a sealing composition which has a specific gravity lower than that of the dielectric solvent or solvent mixture; and
c) sealing the filled holes by hardening the sealing composition during or after it phase-separates and forms a supernatant layer above the electrophoretic fluid.
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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.
514 Citations
26 Claims
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1. A process for the preparation of well-defined and isolated cells to be used in an electrophoretic display, which process comprises the steps of:
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a) laminating a film with prepunched holes on a conductor layer;
b) filling the holes with an electrophoretic fluid comprising charged pigment suspension in a dielectric solvent or solvent mixture and a dispersion of a sealing composition which has a specific gravity lower than that of the dielectric solvent or solvent mixture; and
c) sealing the filled holes by hardening the sealing composition during or after it phase-separates and forms a supernatant layer above the electrophoretic fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electrophoretic display comprising a plurality of closed cells with a dimension in the range of about 1×
- 102 to about 1×
106 μ
m, each of said cells comprises;(a) surrounding partition walls, (b) an electrophoretic fluid filled therein, and (c) a polymeric sealing layer which is formed from a sealing composition having a specific gravity lower than that of the electrophoretic fluid and sealingly adheres to the surface of the partition walls to enclose the electrophoretic fluid within each cell. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
- 102 to about 1×
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19. A process for the preparation of well-defined and isolated cells to be used in an electrophoretic display, which process comprises the steps of:
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a) laminating a film with prepunched holes on a conductor layer;
b) filling the holes with an electrophoretic fluid comprising charged pigment suspension in a dielectric solvent or solvent mixture;
c) sealing the filled holes by overcoating onto said electrophoretic fluid a sealing composition which is at least partially immiscible with said dielectric solvent or solvent mixture and has a specific gravity lower than that of said dielectric solvent or solvent mixture; and
d) hardening said sealing composition. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification