Optical position detecting device and recording medium

Details Optical position detecting device and recording medium Optical position detecting device and recording medium

2005-01-04

2005-01-04

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C345S175000

Reexamination Certificate

active

06838657

ABSTRACT:
The position of a light blocking object is detected not only within a display screen, but also outside the display screen. With the use of the function of detecting the position in a region outside the display screen, it becomes possible to provide virtual buttons in this region and detect dust around a light retro-reflector. Dirt on the light retro-reflector is detected based on the levels of light receiving signals of optical units.

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