Optically addressed liquid crystal displaying and recording devi

Details Optically addressed liquid crystal displaying and recording devi Optically addressed liquid crystal displaying and recording devi

1994-10-19

1996-10-15

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 51, G02F 1135, G02F 11333

Patent

active

055660126

ABSTRACT:
An optically addressing liquid crystal displaying and recording device is capable of obtaining good images free of non-uniformity of density without impairing the characteristics of a light modulating layer. The device includes a light modulating layer 1 including liquid crystals, a photoconductive layer 2 laminated on one side of the light modulating layer 1 and a voltage controlling device 3 for controlling the polarity of the voltage applied to the light modulating layer 1 and the photoconductive layer 2. The device further includes an exposing device 4 for repeatedly scanning a beam on the photoconductive layer 2, a detecting device 5 for detecting scanning of a beam and a controlling device 3 for controlling a timing when the voltage is applied in accordance with a detecting signal outputted by the detecting device 5. The polarity of the voltage applied to each pixel of the laminate of the photoconductive layer and the light modulating layer is controlled by the voltage controlling device 3 to be opposite with respect to that of the voltage applied to the same pixel during previous scanning based on the detecting signals produced and sent by the detecting device 5.

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