Row conductor scanning drive circuit for matrix display panel

Details Row conductor scanning drive circuit for matrix display panel Row conductor scanning drive circuit for matrix display panel

1983-12-05

1986-12-30

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340718, 340784, 340800, 340811, 350332, G09G 302

Patent

active

046332421

ABSTRACT:
A row conductor drive circuit for a matrix display device, to be formed directly upon one substrate of a display panel, is divided into a number of circuit sections connected in series each comprising at least two shift registers. Only one shift register in a circuit section is made operable to produce row conductor scanning signals, the operable shift register being selected based on testing performed after manufacture and with shift registers being selectively set in the operable or non-operable states by potentials applied to control terminals provided in the circuit sections. A set of properly operating shift registers are thereby effectively connected in series to produce row conductor scanning signals even if some shift registers of the circuit sections are defective. Manufacturing yield of the display device is thereby substantially increased.

REFERENCES:
patent: 4368523 (1983-01-01), Kawate
patent: 4481511 (1984-11-01), Hanmura et al.
"A Liquid-Crystal TV Display Panel Using a MOS Array with Gate-Bus Drivers", Kasahara et al, Conference Record, Cherry Hill, N.J. (21-23 Oct. 1980).

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