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:
May. 08, 1990
Filed:
May. 06, 1988
Antonius G Verhulst, Eindhoven, NL;
Jacob Bruinink, Eindhoven, NL;
Emanuel J Lenders, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
An electroscopic fluid display comprises substrates (1, 2) having fixed electrodes (12, 22), and movable electrodes (3) between the substrates, the electrodes (12, 22, 3) being provided on the free main surfaces with an insulating layer (13, 23, 31, 32) respectively, and the asymmetry of the alternating voltage drive for the electrodes being adapted to the difference in surface properties as regards charge delivery and charge adsorption of facing insulating layers (13, 31; 32, 23), or the alternating voltage drive is symmetrical, and facing insulating layers (13, 31; 32, 23) have substantially the same surface properties as regards charge delivery and charge adsorption. The insulating layer (31, 32) consists, preferably, on at least one main surface of the movable electrode (3) of anodized electrode material and continuing along (33) the outer peripheral and inner peripheral portions of the perforated movable electrode 3. The insulating layer on the substrate (1, 2) opposite the insulating layer of anodized metal material (31, 32) on the main surface of the movable electrode (3) consist of an oxide of the same metal material.