Electrophoretic display device, driving method of electrophoretic display device, and electronic apparatus
AssigneeSeiko Epson Corporation
InventorTakashi Sato
Life of this patent
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Abstract
An electrophoretic device includes: a first substrate and a second substrate; an electrophoretic layer including colored particles that is arranged between the first substrate and the second substrate; first electrodes; first transistors connected to the first electrodes; opposing electrodes that have larger areas than the first electrodes and have transparency; and a reflecting layer that has a larger area than the first electrodes, wherein the gradation is controlled by the area of the colored particles that is visible when the electrophoretic layer is seen from the second substrate side.
Claims20
An electrophoretic display device comprising:
- a first substrate and a second substrate;
- an electrophoretic layer that is arranged between the first substrate and the second substrate and that includes at least a dispersion medium and positively or negatively charged colored particles mixed into the dispersion medium;
- first electrodes that are formed for each pixel on the electrophoretic layer side of the first substrate and that are independently driven for each pixel;
- first transistors connected to the first electrodes;
- opposing electrodes that are formed on the electrophoretic layer side of the second substrate, have larger areas than the first electrodes, and have transparency;
- and
- a reflecting layer that is formed over the first substrate, reflects light, and that has a larger area than the first electrodes,
- wherein the gradation is controlled by an area of the colored particles that is visible when the electrophoretic layer is seen from the second substrate side.
A driving method of an electrophoretic display device including a first substrate and a second substrate, an electrophoretic layer that is arranged between the first substrate and the second substrate and that includes at least a dispersion medium and positively or negatively charged colored particles mixed into the dispersion medium, first electrodes that are formed for each pixel on the electrophoretic layer side of the first substrate and that are independently driven for each pixel, transistors connected to the first electrodes, opposing electrodes that are formed on the electrophoretic layer side of the second substrate, have larger areas than the first electrodes, and have transparency, and a reflecting layer that is formed over the first substrate and reflects light over a larger area than the first electrodes, wherein the gradation is controlled by an area of the colored particles that is visible when the electrophoretic layer is seen from the second substrate side, the driving method comprising:
- a first operation of attracting the colored particles toward the first electrode side by applying a voltage to the first electrodes and the opposing electrodes;
- a second operation of attracting the colored particles toward the opposing electrode side by applying a voltage to the first electrodes and the opposing electrodes;
- and
- in the first operation and the second operation, an electric potential that repels the colored particles is applied to the reflecting layer.
Dependencies are inferred from the claim text.