Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1993-07-21
1995-02-14
Oberley, Alvin E.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
345 92, 178 18, G09G 302
Patent
active
053899512
ABSTRACT:
A liquid crystal display (LCD) is constructed in layers including an integrated circuit layer containing thin film transistors (TFTs) for controlling activation of individual liquid crystal cells, and selectively actuatable Hall effect elements (HEEs) for controlling operation of the TFTs. The display operates in different modes including operating solely as an output device, or as an input device, or both. Each HEE and TFT is contained in a cell circuit that further includes a switch operable in a plurality of modes in accordance with the settings of mode control signals and cell selection signals. A magnetic actuator produces a magnetic field for selectively actuating cells. Cell circuits produce output signals dependent on the polarity of the actuating magnetic field. An alternate cell circuit allows a cell to be actuated by a field of one polarity and deactuated by a second field of the opposite polarity.
REFERENCES:
patent: 3944740 (1976-03-01), Murase et al.
patent: 4841290 (1989-06-01), Nakano et al.
patent: 5151688 (1992-09-01), Tanaka et al.
Goon Gin
International Business Machines Corp.
McConnell Daniel E.
McKechnie Douglas R.
Oberley Alvin E.
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