Bi-stable liquid crystal device and driving method which allows

Details Bi-stable liquid crystal device and driving method which allows Bi-stable liquid crystal device and driving method which allows

1994-02-15

1995-01-03

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

345 97, G02F 11343

Patent

active

053791380

ABSTRACT:
A liquid crystal device is driven by employing a two step writing scheme. In the first step, a pixel is cleared to a second orientation state by a clearing pulse and then a voltage for writing the pixel is applied thereto. In the second step, an additional voltage for writing the pixel is applied thereto. By employing a two step writing scheme, it is possible to compensate for the difference in threshold voltage necessary to write, to a first orientation state, a pixel previously in the first orientation state and a pixel previously in the second orientation state without increasing the time between application of a clearing pulse and a writing signal.

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