Active matrix liquid crystal displays having diodes connected be

Details Active matrix liquid crystal displays having diodes connected be Active matrix liquid crystal displays having diodes connected be

1993-12-15

1995-12-05

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 60, 359 68, 345 93, G02F 1133, G02F 1136

Patent

active

054734517

ABSTRACT:
An active matrix for liquid crystal displays having a plurality of picture elements, a plurality of address buses, and a plurality of data buses orthogonal to the address buses. Each picture element includes at least one display electrode; a first switching device coupled between the display electrode and a first respective one of the address buses and a first respective one of the data buses; and a second switching device coupled between the display electrode and a second respective one of the address buses and a second respective one of the data buses, the second switching device including a device for preventing the display electrode from discharging whenever the second respective data bus becomes defective. In another embodiment, the picture element includes a second switching device coupled between the second display electrode and the first respective address bus; a third switching device coupled between the first display electrode and a second respective one of the address buses and a respective one of the data buses; and a fourth switching device coupled between the second display electrode and the second respective address bus and the respective data bus, at least one of the third and fourth switching device including device for preventing the display electrodes from discharging when the respective data bus becomes defective.

REFERENCES:
patent: 4781438 (1988-11-01), Noguchi
patent: 5075674 (1991-12-01), Katayama et al.
patent: 5191322 (1993-03-01), Katayama et al.
patent: 5371351 (1994-12-01), Van Berkel

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