Driver circuit for matrix type display device

Details Driver circuit for matrix type display device Driver circuit for matrix type display device

1986-11-24

1988-11-15

Curtis, Marshall M.

Communications: electrical

Continuously variable indicating

With meter reading

340784, 340801, 3072722, 377 73, 377115, G09G 336

Patent

active

047852976

ABSTRACT:
A drive circuit for producing scanning pulses to successively select row or column conductors of a matrix display device of the type having an active element provided for each display element in the matrix, the drive circuit comprising a shift register made up of a set of cascade-connected master-slave flip-flops, with both the master outputs and the "slave" outputs being utilized to form the scanning pulses. The number of flip-flop stages required is reduced by 1/2, by comparison with prior art drive circuits using master-slave flip-flops, and the frequency of the clock pulse signal required to drive the shift register is 1/2 of that required in the case of a prior art circuit.

REFERENCES:
patent: 3577086 (1971-05-01), Kilman
patent: 3675049 (1972-07-01), Haven
patent: 3912950 (1975-10-01), Tada
patent: 4495628 (1985-01-01), Zasio
patent: 4495629 (1985-01-01), Zasio et al.
patent: 4542301 (1985-09-01), Nabaru
patent: 4612659 (1986-09-01), Starke

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