Electrophoretic display and novel process for its manufacture
AssigneeSiPix Imaging, Inc.
InventorsRong-Chang Liang, Scott C-J Tseng, Zarng-Arh George Wu, HongMei Zang, Hsiao-Ken Chuang
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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.
Claims26
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.
An electrophoretic display comprising a plurality of closed cells with a dimension in the range of about 1×102 to about 1×106 μm, 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.
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;
- 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.
Dependencies are inferred from the claim text.