Display device having a liquid crystal

Details Display device having a liquid crystal Display device having a liquid crystal

1981-06-12

1982-08-03

Waring, Alvin H.

Communications: electrical

Land vehicle alarms or indicators

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

340788, G06F 314

Patent

active

043429947

ABSTRACT:
In a display device having a liquid crystal the gate circuits for the row selection switches (25, 26) can be considerably simplified by coupling a terminal (30) of the supply source (32) for the selection switches to the ground conductor (39) by means of an auxiliary supply source producing a periodical pulsating direct current voltage (33, 34, 40).
To simplify the drive of column excitation switches (26, 28) a further auxiliary supply source (43, 44, 50) can be used in a similar manner for a display device which drives liquid crystal display elements (1, 2, 3, 4) of the rms-type in time-division multiplex.
All the required voltages can be obtained from one central supply source (122, 124) by means of at least one current source circuit (100, 102).

REFERENCES:
patent: 4231035 (1980-10-01), Van Dorn et al.
patent: 4281324 (1981-07-01), Nonomura et al.
patent: 4308534 (1981-12-01), Yamamoto

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