Electrochromic display having a dielectric layer

• US 4,855,727 A
• Filed: 06/16/1986
• Issued: 08/08/1989
• Est. Priority Date: 06/18/1982
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Yamashita, Akio, Tsuchiya, Soji, Ito, Yoshimasa, Higuchi, Sadashi
• Primary Examiner(s): Curtis, Marshall M.
• Application Number:
  US06/874,829
• Time in Patent Office: 1,149 Days
• Field of Search: 340/785, 350/357, 350/363
• US Class Current: 345/105
• CPC Class Codes: G02F 1/155 Electrodes

Abstract

An electrochromic display device comprises a pair of first and second, opposed insulative substrates, a layer of electrochromic substance sandwiched between the substrates, a transparent display electrode on the first substrate, and a counter electrode on the second substrate. A dielectric layer analogous in pattern to the display electrode is formed on the counter electrode to improve the device'"'"'s life time and eliminate interference between adjacent display electrodes.

Claims

1. An electrochromic display device comprising,

a pair of first and second, opposed insulative substrates,

a layer of an electrochromic substance sandwiched between said substrates,

a transparent display electrode on said first substrate, and

a counter electrode on said second substrate, said counter electrode including a dielectric region having an area substantially equal to the area of said display electrode in opposed relationship with said display electrode and a conductive region surrounding said dielectric region.

2. An electrochromic display device as claimed in claim 1, wherein said dielectric region is composed of a member selected from the group consisting of inorganic oxides, fluorides and nitrides.

3. An electrochromic display device as claimed in claim 1, wherein said dielectric region is composed of glass.

4. An electrochromic display device as clained in claim 1, wherein said dielectric region is analogous in shape to the shape of said display electrode.

5. An electrochromic display device as claimed in claim 1, wherein said dielectric region is identical in size and pattern to said display electrode.

6. An electrochromic display device as claimed in claim 1, wherein said conductive region is formed by a conductive layer on said second substrate and said dielectric region is formed by a dielectric layer on said conductive layer.

7. An electrochromic display device as claimed in claim 1, wherein said second substrate includes a dielectric member and said dielectric region is formed by a part of said dielectric member.