Liquid crystal projection apparatus and driving method thereof

Details Liquid crystal projection apparatus and driving method thereof Liquid crystal projection apparatus and driving method thereof

1989-07-12

1992-06-16

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

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

340716, 340781, 358236, 358241, 359 55, G09G 336, G02F 101

Patent

active

051227908

ABSTRACT:
A liquid crystal projection apparatus includes first, second and third liquid crystal display panels, first, second and third liquid crystal display panel driving circuits and a control circuit. The liquid crystal projection apparatus projection apparatus projects and displays pictures of the first, second and third liquid crystal display panels superimposing them on a screen. Each of the first, second and third liquid crystal display panel driving circuits applies driving voltages based on display data to scanned liquid crystal portions in the corresponding liquid crystal display panel. The driving voltages are inverted in polarity for every horizontal scanning period and also for every frame. In addition, at least one of the first, second and third liquid crystal display panels receives driving voltages of opposite polarities with respect to the remaining two panels.

REFERENCES:
patent: 4635127 (1987-01-01), Togashi
patent: 4906071 (1990-03-01), Takahara et al.
The abstract of Japanese Patent Application 60-169827, Patent Abstracts of Japan, vol. 10, No. 15, pub. Jan. 21, 1986, p. 422.

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