Touch panel input device

Details Touch panel input device Touch panel input device

1987-05-29

1989-03-14

Caldwell Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

178 18, 341 23, 341 31, 341 33, G09G 100

Patent

active

048128333

ABSTRACT:
A touch panel input device includes a sensor for detecting that an operator's finger has approached toward a touch input key, to prevent the operator from performing an erroneous key input operation. The sensor includes a multiplicity of optical element pairs each made up of a light emitting diode for emitting a light beam and a photodetector receiving the light beam from the light emitting element. Light beams generated by the optical element pairs are arranged in the form of a matrix to form a detection plane. When the operator's finger traverses the detection plane, a cursor is displayed on the display screen at a position corresponding to the position of the finger on the detection plane. Accordingly, the operator can correct the movement of the finger toward a desired key position by observing the cursor.

REFERENCES:
patent: 3673327 (1972-06-01), Johnson et al.
patent: 4186392 (1980-01-01), Holz
patent: 4205304 (1980-05-01), Moore
patent: 4521870 (1985-06-01), Babbel et al.
R. H. Harris, -"Optical Overlay Input Device for a Cathode Ray Tube", -IBM Technical Disclosure Bulletin -vol. 24, No. 6, Nov./1981, -pp. 2732-2733.
P. Callens, -"Optical Keyboard Device and Technique", -IBM Technical Disclosure Bulletin -vol. 26, No. 6, Nov./83, pp. 2763-2764.

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