Light emitting stylus and user input device using same

Details Light emitting stylus and user input device using same Light emitting stylus and user input device using same

2007-11-20

2007-11-20

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for crt display

C345S179000, C178S018030

Reexamination Certificate

active

10721685

ABSTRACT:
The present invention provides a user input device that includes and array of light detectors and a light emitting stylus configured to emit a beam of light detectable by the light detectors. The light beam is wide enough at the plane of the detectors so that at least two detectors are illuminated for all positions of interest. This allows the light beam position to be interpolated to obtain positional resolution that is greater than would be expected simply due to the spacing between detectors. Interpolation can be further aided by using a light beam that has a known variance in cross-sectional intensity. The present invention also provides for determining the orientation of the stylus by comparing the detected shape of the light beam cross-section to the known shape of the light beam cross-section.

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Robinson, Scott and Nguyen, Tim, “Active Matrix LCD with Integrated Optical Touch Screen”, SID 03 Digest, 56.3.

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