Method for improving the gradational display of an active type l

Details Method for improving the gradational display of an active type l Method for improving the gradational display of an active type l

1991-09-19

1992-12-22

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

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

340805, G09G 336

Patent

active

051736870

ABSTRACT:
A method of driving an active matrix type liquid crystal display unit of the type including a plurality of liquid crystal layers, a plurality of switching elements, a plurality of pixel electrodes each connected between a liquid crystal layer and a switching element, a common electrode connected to the liquid crystal layers, a plurality of stick capacitive elements each connected to a pixel electrode, and a plurality of scanning lines each connected to a switching element, the method including the steps of selectively turning on the switching elements by applying selection signals to the scanning signal lines of the active matrix type liquid crystal display unit; supplying picture signals to picture signal lines connected with the pixel electrodes through the switching elements; and providing an alternating voltage as an integral fraction of a horizontal interval of a picture frame as at least a common voltage at the common electrode and/or a stick capacitor voltage supplied to the capacitive elements, so as to provide that the ratio of the change in liquid crystal light transmittance T to the change in picture signal voltage V.sub.SIG is smaller than the ratio of the change in liquid crystal light transmittance T to the change in effective voltage applied to a respective liquid crystal layer.

REFERENCES:
patent: 4386352 (1983-05-01), Nonomura et al.
patent: 4393380 (1983-07-01), Hosokawa et al.
patent: 4586039 (1986-04-01), Nonomura et al.
patent: 4680580 (1987-07-01), Kawahara
patent: 4928095 (1990-05-01), Kawahara

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