Method for manufacturing electrophoretic display apparatus
View Patent ↗The following is included: loading cells spatially defined by partitions with a dispersion liquid containing electrophoretically mobile particles and a dispersion medium for dispersing the electrophoretically mobile particles, and covering the exposed surface of the dispersion liquid loaded in the cells with a sealing coating to seal the dispersion liquid in the cells. The dispersion medium is a lipophilic hydrocarbon solvent, and the sealing coating is made from a material containing a water-soluble polymer.
1. A method for manufacturing an electrophoretic display apparatus comprising:
loading a cell spatially defined by a partition with a dispersion liquid containing an electrophoretically mobile particle and a dispersion medium for dispersing the electrophoretically mobile particle,
applying a sealing solution to cover an exposed surface of the dispersion liquid loaded in the cell, the sealing solution containing a water-soluble polymer, the water-soluble polymer being dissolved in hydrophilic liquid, and
forming a sealing coating by drying the sealing solution, wherein:
the dispersion medium is a lipophilic hydrocarbon solvent, and
the sealing coating contains a thickening agent to have an increased viscosity, and a target concentration of the thickening agent is from 2 wt % to 5 wt %.
2. The method for manufacturing an electrophoretic display apparatus according to claim 1 , wherein
the water-soluble polymer is polyvinyl alcohol.
3. The method for manufacturing an electrophoretic display apparatus according to claim 1 , wherein
the thickening agent is a gelatinizing agent that turns the sealing coating into a gel by linking molecules of the water-soluble polymer.
4. The method for manufacturing an electrophoretic display apparatus according to claim 3 , wherein
the gelatinizing agent forms a gel through an intermolecular interaction with the water-soluble polymer at a plurality of points.
5. The method for manufacturing an electrophoretic display apparatus according to claim 4 , wherein
the gelatinizing agent is boric acid.