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Optical Engineering

Scalable highly-sensitive optical touch keyboards
Author(s): Sarun Sumriddetchkajorn; Kosom Chaitavon
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Paper Abstract

Due to the need of a highly sensitive touch keyboard for the disabled, we propose no-moving-parts optical touch keyboard architectures based on the use of light splitting and blocking concepts. Light splitting via a fiber optic splitter is also introduced to reduce the precise optical alignment technique required in our free-space-based optical touch keyboard. Several key features are accomplished, including high switch sensitivity, scalability, ease of implementation, and low electrical power consumption. Our free-space-based 5×4 optical touch keyboard prototype shows a key activating time of 19 ms for a keyboard scanning rate of 180 ms per 20 keys. Our optical touch keyboard prototype is also tested in more than 4000 key operations under environmental illuminations from a typical 400 lux to a high 3000 lux without keyboard failure, thus promising good use in practice.

Paper Details

Date Published: 1 April 2006
PDF: 6 pages
Opt. Eng. 45(4) 043005 doi: 10.1117/1.2190216
Published in: Optical Engineering Volume 45, Issue 4
Show Author Affiliations
Sarun Sumriddetchkajorn, NECTEC (Thailand)
Kosom Chaitavon, NECTEC (Thailand)


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