LCOS-SLM characteristics

Drive timing


The controller for our LCOS-SLM contains a frame memory that stores phase images in synchronization with DVI signals at a frame rate of 60 Hz. The phase images are read out from the frame memory at a rate of 240 times per second and are then sent to the D/A converter (DAC) to produce analog signals that drive the LCOS-SLM. Normally, the liquid crystal is AC-driven, so the liquid crystal driving cycle (refresh rate) is 120 Hz and phase fluctuations corresponding to this cycle are observed.

Since the liquid crystal response time is slower than the refresh rate and DVI frame rate (60 Hz), the response time (phase image update cycle) for obtaining a phase distribution that corresponds to phase images is dependent on this liquid crystal response time and reaches about 10 to several tens of hertz.

Block diagram

Timing chart

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