The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 2014
Filed:
Mar. 25, 2010
Yu-jen Chang, New Taipei, TW;
Wei-yi Hsuan, Taipei, TW;
Yi-sheng Lee, Taipei Hsien, TW;
Robert D. Parsons, Raleigh, NC (US);
Yu-Jen Chang, New Taipei, TW;
Wei-Yi Hsuan, Taipei, TW;
Yi-Sheng Lee, Taipei Hsien, TW;
Robert D. Parsons, Raleigh, NC (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A multi-touch optical touch panel which comprises a rectangular position-detecting surface with a length L and a width W; a first set of a plurality of light-emitting element pairs configured for emitting a plurality of light beams, wherein the first set of light-emitting element pairs are arranged at various points along a first side of the position-detecting surface in a lengthwise direction; a second set of a plurality of light-emitting elements are arranged at various points along the first side at 90 degrees with reference to the first side; two reflectors arranged along two opposed sides of the rectangular position-detecting surface in the W direction; and a first set of a plurality of light-receiving element pairs configured for receiving the plurality of light beams emitted by the first set of light-emitting element pairs, wherein the first set of light-receiving element pairs are arranged at various points along a second side of the position-detecting surface opposite to the first side in a lengthwise direction; a second set of a plurality of light-receiving elements are arranged at various points along the second side at −90 degrees with reference to the second side for receiving the plurality of light beams emitted by the second set of light-emitting elements. A control circuit is configured for causing the first set of light-emitting element pairs and the second set of light-emitting elements to emit the plurality of light beams in a predetermined order to scan the position-detecting surface, and further configured for causing the first set of light-receiving element pairs and the second set of light-receiving elements to receive the plurality of light beams, thereby forming optical paths on the position-detecting surface in a grid pattern.