Integrated liquid crystal display and optical touch panel

Details Integrated liquid crystal display and optical touch panel Integrated liquid crystal display and optical touch panel

1988-10-17

1990-04-10

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340712, 341 31, G06F 303, G01V 904

Patent

active

049163086

ABSTRACT:
A flat panel liquid crystal display (12) with an integrated touch panel has a multitude of pixels (28) arranged in multiple columns and multiple rows. The pixels (28) of the first column (54) and last column (66), and of the first row (60) and of the last row (72) are controlled in conjunction with emitters (52, 58) and detectors (64, 70) with associated mirrors (74, 80, 82, 84) to create a sequence of light beams that extend across the display panel (12) in both the X and Y directions. Whenever a stylus (86) is placed near the display panel, two orthogonal light beams are interrupted corresponding to the X and Y positions of the stylus (86) relative to the display panel (12).

REFERENCES:
patent: 3654389 (1972-04-01), Pole
patent: 3764813 (1973-10-01), Clement
patent: 3775560 (1973-11-01), Ebeling
patent: 3860754 (1975-01-01), Johnson
patent: 4243879 (1981-01-01), Carroll
patent: 4459476 (1984-07-01), Weissmueller et al.
patent: 4645920 (1987-02-01), Carroll
patent: 4672364 (1987-06-01), Lucas
patent: 4684801 (1987-08-01), Carroll
Publication A., IBM Technical Disclosure Bulletin entitled "Light Beam Matrix Input Terminal", vol. 9, No. 5, Oct. 1966.
Publication B., Hewlett-Packard Journal, Aug. 1984, entitled "The HP 150 Touchscreen: An Interactive User Input Device for a Personal Computer".
Publication C., Electronics, Apr. 19, 1984, entitled "Touch Screens Let Your Fingers Provide a Fast, Simple Entry Into the Computer".

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