Optically addressed spatial light modulating system bias light s

Details Optically addressed spatial light modulating system bias light s Optically addressed spatial light modulating system bias light s

1992-09-30

1996-09-10

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 48, 359256, 359 56, G02F 1135

Patent

active

055551157

ABSTRACT:
An optically addressed spatial light modulating system comprises a spatial light modulator using a liquid crystal material. A writing light irradiation device irradiates a writing light which records an image onto the spatial light modulator. A reading out light irradiation device irradiates a reading out light which is used to read out the recorded image from the spatial light modulator. A bias light irradiation device irradiates a bias light onto the spatial light modulator, and a bias light adjustment device changes at least one of the irradiation time and the light intensity of the bias light. A driving device supplies writing voltage signals to the spatial light modulator. The irradiation time of the write light and the irradiation time of the bias light overlap with the application time of the write voltage of the spatial light modulator for a predetermined amount of time for adjusting the sensitivity of the spatial light modulator. Thus, the changing of the recording sensitivity of the optically addressed spatial light modulator is facilitated. It is also possible to write data into the spatial light modulator operating at a high speed by changing the threshold of the write image and to record an image with low write light intensity.

REFERENCES:
patent: 4941735 (1990-07-01), Moddel et al.
patent: 5130830 (1992-07-01), Fukushima et al.
patent: 5191408 (1993-03-01), Takanashi et al.
patent: 5221980 (1993-06-01), Yamamoto et al.
patent: 5274716 (1993-12-01), Mitsuoka et al.

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