Scanned liquid crystal display with select scanner redundancy

Details Scanned liquid crystal display with select scanner redundancy Scanned liquid crystal display with select scanner redundancy

1989-12-22

1991-11-05

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

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

340800, G09G 318

Patent

active

050633783

ABSTRACT:
A liquid crystal device (LCD) display includes a grid of conductive row select lines and column data lines which are used in conjunction with thin-film transistors (TFT's) to address pixel electrodes in the display. The LCD display includes two shift registers for receiving and propagating the select signals for the row select lines, each shift register has a plurality of shift register stages, one connected to each row select line. A plurality of combiner circuits are provided, one for each stage of each of the shift registers. Each combiner circuit is configured to provide an electrical conduction path for the select signal between successive stages in each of the shift registers. When a fault is detected in a stage of one of the shift registers, the combiner circuit coupled to the output of the defective stage reconfigured to route the select signal from the corresponding stage of the other shift register to the next stage of the one shift register. Full select shift register redundancy is provided, even if both shift registers have faulty stages.

REFERENCES:
patent: 4368523 (1983-01-01), Kawate
patent: 4427978 (1984-01-01), Williams
patent: 4633242 (1986-12-01), Sekiya
patent: 4660030 (1987-04-01), Maezawa
patent: 4679043 (1987-07-01), Morokawa
patent: 4694348 (1987-09-01), Kamiya
patent: 4742346 (1988-05-01), Gillette
patent: 4766430 (1988-08-01), Gillette
patent: 4779086 (1988-10-01), Kanno
patent: 4804953 (1989-02-01), Castleberry
"Using Redundancy When Designing Active-Matrix-Addressed LDCs", S. Bisotto, Proceedings of the SID, vol. 26/3, 1985, pp. 201-207.

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