Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1986-04-24
1988-03-29
Birmiel, Howard A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340784, 340805, G09G 336
Patent
active
047346922
ABSTRACT:
A driver circuit for a liquid crystal display for driving a liquid crystal panel in an A.C. manner. In this circuit, a display signal voltage to be applied to one electrode of the liquid crystal cell and a common voltage to be applied to a common electrode thereof are inverted in their polarity with a certain period, respectively, and at least one of the signal voltage and common voltage that are being polarity-inverted with the certain period is varied in its D.C. level by the same amount in the same direction in each period so that they can be adjusted so as to be in a predetermined relation for A.C. driving.
REFERENCES:
patent: 4100579 (1978-07-01), Ernstoff
patent: 4395708 (1983-07-01), Lloyd
patent: 4477805 (1984-10-01), Arton et al.
patent: 4525710 (1985-06-01), Hoshi et al.
patent: 4626841 (1986-12-01), Togashi
Hosono Masaki
Nemoto Yukio
Birmiel Howard A.
Matsushita Electric - Industrial Co., Ltd.
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