Elastomer display device

• US 4,119,368 A
• Filed: 12/22/1976
• Issued: 10/10/1978
• Est. Priority Date: 12/25/1975
• Status: Expired due to Term

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Inventors: Yamazaki, Toru
• Primary Examiner(s): Miller, Jr., Stanley D.
• Assistant Examiner(s): Davie, James W.
• Application Number:
  US05/753,539
• Time in Patent Office: 657 Days
• Field of Search: 350/161 S, 350/161 R, 350/355, 350/359, 350/360, 340/324 M
• US Class Current: 359/291
• CPC Class Codes: G02B 26/00 Optical devices or arrangements for the control of light using movable or deformable optical elements control of light by modification of the optical properties of the media of the elements involved therein G02F1/00

Abstract

An elastomer display device which can discriminate by unaided visual observation a pattern to be displayed by utilizing elastic deformation of an elastomer produced upon application of an electric voltage thereto is disclosed. The device comprises a transparent substrate and four laminated coatings consisting of a transparent electric conductive membrane pattern to be displayed, a transparent elastomer coating, a metal reflecting coating and an electric conductive elastomer coating. Between the transparent electric conductive membrane pattern and the elastomer coating is interposed a transparent insulating coating which functions to decrease the voltage required for driving the elastomer display device. On the electric conductive elastomer coating is formed an opposed electrode formed of metal or electric conductive resin which functions to apply the voltage to overall surface of the display device. At least one of the electric conductive elastomer coating, transparent elastomer coating, metal reflecting coating and opposed electrode is formed into a pattern-shape which functions to prevent electric field from spreading out of the pattern and prevent frost-shaped surface deformation from being projected out of the pattern, thereby providing an elastomer display device having a high resolving power.

Claims

1. An elastomer display device comprising:

(a) a transparent substrate;

(b) a transparent electrically conductive membrane arranged on said transparent substrate according to a pattern to be displayed;

(c) a transparent elastomer coating overlying and in contact with the transparent substrate and also overlying and in contact with the transparent conductive membrane pattern;

(d) a metal reflecting coating overlying and contacting at least portions of the transparent elastomer coating;

(e) a transparent insulating coating in contact with the metal reflecting coating and arranged according to a pattern which overlies the transparent substrate at those portions which are not covered by the transparent electrically conductive membrane pattern to be displayed;

(f) a conductive elastomer coating in contact with the metal reflecting coating and overlying at least the transparent electrically conductive membrane pattern to be displayed;

(g) an electrode layer overlying and in contact with the conductive elastomer coating.

2. An elastomer display device according to claim 1, wherein the conductive elastomer coating (f) is arranged in the same pattern as the pattern to be displayed.

3. The elastomer display device according to claim 2, wherein the transparent insulating coating (e) is arranged between the metal reflecting coating (d) and the electrode layer (g).

4. The elastomer display device according to claim 3, wherein the transparent elastomer coating (c) is formed from a transparent silicon resin having a volume resistivity of greater than 10¹⁵ Ω

cm and has a thickness of about 5 microns;

the metal reflecting layer (d) has a thickness of 300 A to 1,000 A; and

, the conductive elastomer coating (f) is formed of silicon resin mixed with carbon.

5. The elastomer display device according to claim 1, wherein the transparent insulating coating (e) is arranged between the metal reflecting coating (d) and the transparent elastomer coating (c).

6. The elastomer display device according to claim 5, whereing the transparent elastomer coating (c) is formed of a transparent silicon resin having a volume resistivity of greater than 10¹⁵ Ω

cm;

the transparent insulating coating (e) is a silicon resin having a volume resistivity of about 10¹⁵ Ω

cm and a thickness of about 15μ

; and

the thickness of the potion of the transparent elastomer coating (c) which is not opposed to the transparent electrically conductive membrane pattern (b) is about 3 times thicker than the portion of the transparent elastomer (c) which is opposed to the transparent electrically conductive membrane pattern (b).