Light transmissive substrate carrying a light transmissive low ohmic coating

• US 6,404,120 B1
• Filed: 05/07/1999
• Issued: 06/11/2002
• Est. Priority Date: 05/08/1998
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Somers, Michel J. M., Aben, Gerardus V. A.
• Primary Examiner(s): Patel, Nimeshkumar D.
• Assistant Examiner(s): Guharay, Karabi
• Application Number:
  US09/307,157
• Time in Patent Office: 1,131 Days
• Field of Search: 313/479, 313/478, 313/477.R, 313/113, 313/114, 313/110
• US Class Current: 313/479
• CPC Class Codes: C03C 17/009 Mixtures of organic and inorganic materials, e.g. ormosils and ormocers
• CPC Class Codes: C03C 17/34 with at least two coatings having different compositions C03C17/44 takes precedence
• CPC Class Codes: C09D 5/24 Electrically-conducting paints conductive materials H01B1/00
• CPC Class Codes: H01J 29/868 Screens covering the input or output face of the vessel, e.g. transparent anti-static coatings, X-ray absorbing layers

Abstract

Substrate carrying a mixed organic conductive polymer/transparent metal oxide coating having a thickness between 100 and 600 nm.

The conductive polymer polyethylene-dioxythiophene (PEDOT) is an interesting material to reduce the alternating electric field (AEF) emitted at the front of a colour monitor tube. The processing of the PEDOT is based on chemical polymerisation of ethylenedioxy-thiophene (EDOT) and Fe(III) toluene sulphonate on a face plate of the tube. After the polymerisation is completed, the Fe salt is extracted from the coating by rinsing with an ethanolic solution. If TEOS is used, a hybrid PEDOT/SiO₂ film is formed. The specific conductivity is 120 S/cm and the average transmission (380-780 nm) 80% for a layer thickness of about 300 nm.

Claims

1. Light transmissive substrate carrying a light transmissive low ohmic coating, wherein the coating is a mixed organic conductive polymer and transparent metal oxide coating having a layer thickness between 100 and 600 nm and a sheet resistance of less than 1 KΩ

/□

.

2. Substrate as claimed in claim 1, wherein the organic conductive polymer is selected from the group consisting of polythiophene and its derivatives.

3. Substrate as claimed in claim 1, wherein the coating comprises between 10 and 90 vol. % of the organic conductive polymer.

4. Substrate as claimed in claim 1, wherein the coating, alone or in combination with a transparent further coating, forms an antireflex filter.

5. Substrate as claimed in claim 1, wherein the coating forms a ¾

□

stack.

6. Substrate as claimed in claim 1, in which the coating is a mixed organic conductive polymer and SiO₂ coating.

7. Display device comprising a substrate as claimed in any of the preceding claims.