Optical touch-screen systems and methods using a planar transparent sheet

Patent metadata

Field	Value
Publication number	US-9213445-B2
Application number	US-201213686426-A
Country	US
Kind code	B2
Filing date	Nov 27, 2012
Priority date	Nov 28, 2011
Publication date	Dec 15, 2015
Grant date	Dec 15, 2015

Abstract

An optical touch screen that utilizes a planar transparent sheet and that is configured to determine the position of a touch event on the transparent sheet is disclosed. Light-source elements and light-sensing elements are operably disposed at a perimeter of the transparent sheet. Light is detected over lines-of-sight between the light-source elements and the light-sensing elements. Attenuated lines-of-sight due to the touch event are determined. Central lines are established based on the attenuated lines-of-sight. The locations of central-line intersections are then established. The average of the locations of the central-line intersections is then used to establish the location of the touch event.

First claim

What is claimed is:

1. A touch-screen system for sensing a location of a touch event, comprising:
a transparent sheet having a top surface, a bottom surface, and a perimeter that includes an edge, wherein the touch event occurs on the top surface;
a plurality of light-source elements that emit light and that are disposed adjacent the perimeter either adjacent the edge or adjacent the bottom surface substantially at the edge, so as to couple the light into the transparent sheet t…

Assignees

• Corning Inc

Inventors

• King Jeffrey Stapleton
• Orsley Timothy James
• Trutna William Richard
• Walker Richard Clayton

Classifications

• G06F3/0421 Primary

  Physics · mapped topic

• G06F3/0428

  Physics · mapped topic

• G06F2203/04109

  Physics · mapped topic