LCD touch screen

Details LCD touch screen LCD touch screen

1990-05-25

1992-04-14

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340712, 341 31, G09G 336

Patent

active

051051869

ABSTRACT:
A touch screen includes a liquid crystal display (LCD) having a viewing surface through which light passes into and out of the display and a back surface comprising a transflector such as transflective film. The transflector reflects some of the light back through the display and viewing surface and transmits some of the light. An array of light dependent resistors (LDRs) or equivalent light detecting devices underlie the transflector and detect a change in the transmitted light caused by a touching of the viewing surface. The light detecting array may be integrated into a keyboard interface. Keys are then displayed on the viewing surface opposite LDRs in the array to indicate where the viewing surface must be touched to actuate a key.

REFERENCES:
patent: 3971013 (1976-07-01), Challoner et al.
patent: 4484179 (1984-11-01), Kasday
patent: 4707689 (1987-11-01), DiPiazza et al.
patent: 4723836 (1988-02-01), Kono et al.
patent: 4782328 (1988-11-01), Denlinger
patent: 4977315 (1990-12-01), Purcell

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