Display cell structure and electrode protecting layer compositions
View Patent ↗The invention is directed to compositions of display cell structure and electrode protecting layers for improving the performance of display devices. The composition comprises a polar oligomeric or polymeric material having a glass transition temperature below about 100° C., and the resulting display cells or electrode protecting layer have an average crosslinking density of below about 1 crosslink point per 80 Dalton molecular weight.
1. A display device comprising display cells, electrodes, and electrode protecting layers, wherein the display cells or at least one of the electrode protecting layers is formed from a composition comprising a polar oligomeric or polymeric material which comprises at least one polar group selected from the group consisting of nitro, hydroxyl, alkoxy, halo, cyano, sulfonate, amino containing or amino-derived polar groups, carbohydrate groups, phosphorus containing polar groups, sulfur containing polar groups, and anions; wherein said display cells or said electrode protecting layer have a resistivity in the range of about 10 7 to about 10 12 ohm cm.
2. The display device according to claim 1 , wherein said polar group is a carbohydrate group or an amino containing or amino-derived polar group.
3. The display device according to claim 2 , wherein said amino containing or amino-derived polar group is amino, pyridine, quatanary ammonium, amide, lactam, caprolactam, hydrazone, imidazole, imine, pyridone, carbamate, dithiocarbamate, urea, oxazoline, oxime, or indole.
4. The display device according to claim 2 , wherein said carbohydrate group is furanose, pyranose, glucose, or glucosamine.
5. The display device of claim 1 , wherein said electrode protecting layer is a primer layer.
6. The display device of claim 1 , wherein said electrode protecting layer is a sealing layer.
7. The display device of claim 1 , wherein said electrode protecting layer is an adhesive layer.
8. The display device of claim 1 , wherein said electrode protecting layer is a tie layer.
9. The display device of claim 8 , wherein said tie layer has areas of different colors.
10. The display device of claim 1 , which is an electrophoretic display.
11. The display device of claim 10 , wherein the display cells are microcups or microcapsules.
12. The display device of claim 1 , which is a liquid crystal display.
13. A method for improving the performance of an electrophoretic display comprising:
(i) forming a composition comprising a polar oligomeric or polymeric material which comprises at least one polar group selected from the group consisting of hydroxyl, carboxy, amino containing or amino-derived polar groups, carbohydrate groups, phosphorus containing polar groups, sulfur containing polar groups, and anions;
(ii) forming display cells and forming an electrode protecting layer, wherein the display cells or the electrode protecting layer has an average crosslinking density of below about 1 crosslink point per 80 Dalton molecular weight from said composition; and
(iii) filling said display cells with an electrophoretic fluid.
14. The display device according to claim 13 , wherein said polar group is a carbohydrate group or an amino containing or amino-derived polar group.
15. The display device according to claim 14 , wherein said amino containing or amino-derived polar group is amino, pyridine, quatanary ammonium, amide, lactam, caprolactam, hydrazone, imidazole, imine, pyridone, carbamate, dithiocarbamate, urea, oxazoline, oxime, or indole.
16. The display device according to claim 14 , wherein said carbohydrate group is furanose, pyranose, glucose, or glucosamine.
17. A method for improving the performance of an electrophoretic display comprising:
(i) forming a composition comprising a polar oligomeric or polymeric material which comprises at least one polar group selected from the group consisting of amino containing or amino-derived polar groups, carbohydrate groups, phosphorus containing polar groups, sulfur containing polar groups, and anions; wherein the concentration of said polar oligomeric or polymeric material is no less than about 1% by weight;
(ii) forming display cells and forming an electrode protecting layer, wherein the display cells or the electrode protecting layer is formed from said composition; and
(iii) filling display cells with an electrophoretic fluid.
18. The display device according to claim 17 , wherein said polar group is a carbohydrate group or an amino containing or amino-derived polar group.
19. The display device according to claim 18 , wherein said amino containing or amino-derived polar group is amino, pyridine, quatanary ammonium, amide, lactam, caprolactam, hydrazone, imidazole, imine, pyridone, carbamate, dithiocarbamate, urea, oxazoline, oxime, or indole.
20. The method of claim 17 , wherein said concentration is no less than about 3% by weight.