Touch screen with resistive electrode

• US 20090135146A1
• Filed: 11/27/2007
• Published: 05/28/2009
• Est. Priority Date: 11/27/2007
• Status: Abandoned Application

• Current Assignee: World Properties Incorporated
• Original Assignee: World Properties Incorporated
• Inventors: Scholz, William F.
• Application Number:
  US11/986,924
• Publication Number:
  US 20090135146A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0444 using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners

Abstract

A touch screen includes a resistive layer made from conductive ink and overlying at least a portion of a substrate. The resistive layer has a sheet resistance of 1,000-5,000 Ω/ In one embodiment of the invention, the touch screen is transparent. The touch screen also includes a patterned conductive layer for linearizing current and an insulating layer overlying the patterned conductive layer and the resistive layer.

Claims

1. A touch screen comprising:

a substrate;

a resistive layer overlying at least a portion of said substrate;

wherein said resistive layer is a cured, conductive ink having a sheet resistance of 1,000-5,000 Ω

/

a patterned, conductive layer overlying said resistive layer; and

an insulating layer overlying said resistive layer.

2. The touch screen as set forth in claim 1 wherein said substrate, said resistive layer, and said insulating layer are transparent.

3. The touch screen as set forth in claim 2 wherein said resistive layer is a resin containing particles of indium tin oxide.

4. The touch screen as set forth in claim 1 wherein said resistive layer is a resin containing particles of indium tin oxide.

5. The touch screen as set forth in claim 1 wherein said ink is heat curable.

6. The touch screen as set forth in claim 1 wherein said ink is UV curable.

7. The touch screen as set forth in claim 1 wherein said substrate is a UV curable resin.