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:
Oct. 23, 1984
Filed:
Apr. 21, 1981
Junichi Tabata, Tokyo, JP;
Seiko Instruments & Electronics Ltd., Tokyo, JP;
Abstract
An electrochromic display device has an electrolyte contained between two spaced-apart substrates. A plurality of display segments are disposed on the surface of at least one of the substrates in contact with the electrolyte, and a counter electrode is disposed on the surface of the other substrate in contact with the electrolyte. Each of the display segments comprises a transparent electrode and an electrochromic layer disposed on the transparent electrode such that the display segment exhibits either colored or bleached states depending on the amount of electric charge held by the display segment. A charge transfer voltage is periodically applied between preselected bleached and colored display segments to effect transfer of electric charges through the electrolyte to thereby periodically change the display state. The difference between the coloration electric charge quantity at the present display state and the coloration electric charge quantity at the next display state is compensated for by either injecting or extracting electric charge into or from the display segments so as to maintain the color density constant.