The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 08, 2011
Filed:
May. 16, 2007
Tatsuya Sugita, Takahagi, JP;
Tetsuya Ooshima, Mobara, JP;
Tatsuya Sugita, Takahagi, JP;
Tetsuya Ooshima, Mobara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An object of the present invention is to realize an image display device for color display with high luminance and high contrast. In the present invention, a unit cellis filled with electrophoresis ink including two kinds of particles different in chargeability and color being dispersed in transmissive solvent. Voltage is applied to an opposite electrode, a stacked lower electrodeand an upper electrodeand thereby electrically charged particlesand charged particlesare moved to a first openingand a second openingwhere an insulating layeris provided on the lower electrodeand the upper electrode. Thus assemblage and diffusion state of two kinds of particles are controlled. Thereby, a unit cellobtains four display colors. Since the lower electrodecan be made to be a reflecting layer covering the entire unit cell, it is possible to make the aperture ratio large and the reflection percentage large.