Adhesive and sealing layers for electrophoretic displays
AssigneeE Ink California, LLC
InventorsXiaojia Wang, Cheri Pereira, Jack Hou, Rong-Chang Liang, Gary Yih-Ming Kang
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Abstract
The invention is directed to compositions and methods for improving the physicomechanical and electro-optical properties of an electrophoretic or liquid crystal display and also to semi-finished or finished display panels with improved physicomechanical properties. The invention is further directed to a display device comprising display cells filled with a display fluid and top-sealed with a top-sealing layer, wherein the top-sealing layer has a thickness of less than 10 microns measured at the center area.
Claims18
A display device comprising display cells sandwiched between two electrodes layers, wherein the display cells are:
- (i) filled with a display fluid wherein charged pigment particles are dispersed in a dielectric solvent, and
- (ii) top-sealed with a top-sealing layer formed from a sealing composition comprising a radiation curable composition and a functionalized polyurethane, wherein the functionalized polyurethane has a dielectric constant higher than that of the dielectric solvent and a functional group selected from the group consisting of —OH, —SH, —NCO, —NCS, —NHR, —NRCONHR, —NRCSNHR, vinyl, and epoxide, wherein R is hydrogen or alkyl, aryl, alkylaryl or arylalkyl of up to 20 carbon atoms, wherein the top-sealing layer has a center area and a non-center area, part of the non-center area is adhered to the top portion of the partition wall, the non-center area is thicker than the center area, and the center area is about 1 to about 8 microns in thickness.
Dependencies are inferred from the claim text.