Active matrix circuit for liquid crystal displays

Details Active matrix circuit for liquid crystal displays Active matrix circuit for liquid crystal displays

1988-01-21

1989-12-26

Brigance, Gerald

Communications: electrical

Land vehicle alarms or indicators

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

340784, 350332, G09G 300

Patent

active

048900974

ABSTRACT:
An active matrix circuit for liquid crystal displays includes a plurality of liquid crystal pixels arranged in a matrix, a plurality of scanning lines supplied with selection pulses to select rows of the pixel matrix, a plurality of signal lines supplied with signal voltages which are supplied to the pixels in a selected row, and a plurality of switching elements responsive to the respective selection pulses for supplying the signal voltages to the respective pixels. Each pixel is controlled by two switching elements responsive to selection pulses supplied adjaent to two scanning lines. If one of the two switching elements is defective due to a manufacturing process, it is later electrically isolated from the circuit. The other one can control the respective pixel to operate normally. The switching element may be a transistor or a non-linear device.

REFERENCES:
patent: 4233601 (1980-11-01), Hankins et al.
patent: 4367464 (1983-01-01), Kurahashi et al.
patent: 4368523 (1983-01-01), Kawate
patent: 4429305 (1984-01-01), Hosokawa et al.
patent: 4471347 (1984-09-01), Nakazawa et al.
patent: 4529890 (1985-07-01), Kobayashi et al.
patent: 4633242 (1986-12-01), SEkiya
patent: 4642619 (1987-02-01), Togashi
patent: 4680580 (1987-07-01), Kawahara
patent: 4694287 (1987-09-01), Chevevas-Paule et al.
"Varistor-Controlled Liquid-Crystal Displays", Castelberry, Donald E., vol. ED-26, No. 8, Aug. 1979, pp. 1123-1128.

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