Touch panel apparatus

Details Touch panel apparatus Touch panel apparatus

1989-06-06

1995-05-09

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345173, G09G 116

Patent

active

054144132

ABSTRACT:
A touch panel apparatus of the type in which a plurality of photo-detecting pairs generate a plurality of detecting beams which cross the display surface and including a circuit for reducing the sensitivity of the photo-detecting pairs at the corners of the display surface to prevent malfunction due to reflected beams caused by the relatively higher intensity beams at those locations resulting from the relatively shorter beam lengths

REFERENCES:
patent: 4198623 (1980-04-01), Misek et al.
patent: 4672364 (1987-06-01), Lucas
patent: 4703316 (1987-10-01), Sherbeck
patent: 4761637 (1988-08-01), Lucas et al.
patent: 4799044 (1989-01-01), Masters et al.
patent: 4812642 (1989-03-01), Hasegawa et al.
patent: 4855590 (1989-08-01), Bures et al.
patent: 4933544 (1990-06-01), Tamaru
patent: 4980547 (1990-12-01), Griffin

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