Display sheet, method for producing display sheet, display apparatus, and electronic device

1. A display sheet comprising:

a display layer;

a first electrode on one side of the display layer;

a second electrode on another side of the display layer; and

an electrode protection layer between the display layer and the first electrode, wherein:

the display layer has a partition structure dividing the display layer into a plurality of regions and a liquid dispersion of at least one positively or negatively charged particulate material in a dispersion medium and filling each of the plurality of regions; and

the electrode protection layer and the partition structure are integrally formed and both mainly composed of an electroconductive polymer, wherein the electroconductive polymer is an ultraviolet-curable polymer having an ethylene oxide side chain.

2. The display sheet according to claim 1 , wherein the ethylene oxide side chain is a group represented by a chemical formula (CH 2 —CH 2 —O—) n — where the subscript n is an integer of 2 to 20.

3. The display sheet according to claim 1 , further comprising an adhesive layer between the display layer and the second electrode.

4. The display sheet according to claim 3 , wherein a distal end portion of the partition structure is embedded in the adhesive layer.

5. The display sheet according to claim 3 , wherein the adhesive layer is made of a thermoplastic material.

6. The display sheet according to claim 1 , wherein the partition structure is tapered, getting narrower toward a distal end thereof.

7. A method for producing a display sheet having a display layer, a first electrode on one side of the display layer, and a second electrode on another side of the display layer, comprising:

forming a resin layer mainly composed of an electroconductive polymer on the first ethylene, wherein the electroconductive polymer is an ultraviolet-curable polymer having an ethylene oxide side chain;

forming a plurality of depressions in the resin layer to integrally form a partition structure separating a plurality of regions and an electrode protection layer covering the first electrode;

filling each of the plurality of regions with a liquid dispersion of at least one positively or negatively charged particulate material in a dispersion medium; and

forming the second electrode above the partition structure to seal the depressions.

8. The method for producing a display sheet according to claim 7 , wherein the partition structure and the electrode protection layer are formed by pressing a die having a plurality of projections against the resin layer.

9. The method for producing a display sheet according to claim 7 , wherein the partition structure and the second electrode are joined using an adhesive layer.

10. The method for producing a display sheet according to claim 9 , wherein the partition structure and the second electrode are joined by pressing the partition structure against the adhesive layer to stick a distal end portion of the partition structure into the adhesive layer.

11. The method for producing a display sheet according to claim 10 , wherein the adhesive layer is softened before the partition structure and the second electrode are joined.

12. A display apparatus comprising the display sheet according to claim 1 .

13. A display apparatus comprising the display sheet according to claim 2 .

14. A display apparatus comprising the display sheet according to claim 3 .

15. A display apparatus comprising the display sheet according to claim 4 .

16. A display apparatus comprising the display sheet according to claim 5 .

17. A display apparatus comprising the display sheet according to claim 6 .

18. An electronic device comprising the display apparatus according to claim 12 .