Computer graphics processing and selective visual display system – Display peripheral interface input device – Including keyboard
Patent
1997-10-28
2000-08-01
Wu, Xiao
Computer graphics processing and selective visual display system
Display peripheral interface input device
Including keyboard
345158, 345169, G09G 500
Patent
active
060973730
ABSTRACT:
A laser actuated keyboard system (10) includes a laser pointer (12) mounted on an adjustable headband (14) for directing a collimated beam (16) onto a laser keyboard (18) defined by an array of photosensors (58) that are intended to be illuminated by the user-targeted beam (16). During a laser acquisition mode, the laser pointer (12) output is controlled to provide a relatively retina-safe output and during the captured signal mode, the laser pointer (12) output is controlled to provide a higher-power mode sufficient to be easily seen. During the higher-power mode, the laser pointer (12) is modulated at a selected frequency to assist the laser keyboard (18) in discriminating against common background light. A successful keypress is declared when the beam (16) illuminates a targeted area for a selected percentage of a pre-determined dwell period.
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InvoTek Corporation
Kananen Ronald P.
Wu Xiao
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