Methods and means for testing faults in a liquid crystal display

Details Methods and means for testing faults in a liquid crystal display Methods and means for testing faults in a liquid crystal display

1985-08-27

1988-03-29

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340765, 350332, G09G 318

Patent

active

047346884

ABSTRACT:
A method and arrangement for providing a continuous visual check on the operation of a standard liquid crystal display by superimposing a checking signal upon the operating signals applied to the individual segment and back electrodes of the LCD through individual impedance paths substantially higher than the individual impedance paths carrying the operating signal to the segment and back electrodes so that the operating signal overrides the checking signal under normal circumstances but the checking signal overrides the operating signal when the latter is interrupted due to a fault. The checking signal causes the segment electrode or back electrode whose signal is impaired to blink at a visually perceptible rate. Preferably, the frequency of the checking signal is in the order of 0.5 Hz to 2.0 Hz.

REFERENCES:
patent: 3585629 (1971-06-01), Baynard, Jr.
patent: 3866171 (1975-02-01), Lashbough
patent: 3938140 (1976-02-01), Garcia et al.
patent: 4188625 (1980-02-01), Hodemaekers
patent: 4242677 (1980-12-01), Jonath
patent: 4247852 (1981-01-01), Utzinger
patent: 4297692 (1981-10-01), Maier
patent: 4311993 (1982-07-01), Strobel
patent: 4420748 (1983-12-01), Jurgen

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