Liquid crystal cells – elements and systems – With specified nonchemical characteristic of liquid crystal... – Within smectic phase
Patent
1999-01-29
2000-12-05
Sikes, William L.
Liquid crystal cells, elements and systems
With specified nonchemical characteristic of liquid crystal...
Within smectic phase
349 21, 349 25, 349 72, 349161, C09K 1902
Patent
active
061574325
ABSTRACT:
A heated ferroelectric liquid crystal-based spatial light modulator (SLM) that minimizes pixel sticking when operated in a non-DC-balanced mode with spiking and method for using same. The SLM comprises a transparent electrode, a pixellated electrode, ferroelectric liquid crystal material, and a heater. The ferroelectric liquid crystal material is sandwiched between the transparent electrode and the pixellated electrode. The heater is capable of heating the ferroelectric material to at least 40.degree. C. and preferably to between 50 and 60.degree. C. The invention may also provide a temperature sensor for detecting the temperature of the SLM and a temperature control circuit that is electrically connected to both the temperature sensor and the heater. The temperature sensor may be a diode located proximate to the pixellated electrode or a photo-diode located remote from the spatial light modulator. The heater may be integrated into and encapsulated by a substrate supporting the pixellated electrode or it may be supported on a second major surface of the substrate. The method according to the invention includes providing a SLM, preheating the SLM, and operating the SLM in a non-DC-balanced mode with spiking while monitoring and maintaining the a temperature of the SLM above 50.degree. C.
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Chowdhury Tarifur R.
Hewlett--Packard Company
Sikes William L.
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