Spatial light modulator

A liquid crystal on silicon spatial light modulator comprising:

• an array of light-modulating pixels each comprising liquid crystal, wherein each light-modulating pixel is associated with a respective flip-flop;
• a controller arranged to:
• receive a hologram of an image, wherein the hologram comprising a plurality of hologram pixels each comprising a respective n-bit hologram pixel value;
• and drive each light-modulating pixel of a contiguous group of n light-modulating pixels in accordance with a respective hologram pixel value of the hologram such that there is a one-to-n pixel correlation between the hologram and the light-modulating pixels,
• wherein the flip-flops of each contiguous group of n light-modulating pixels are connected in series to form a shift register such that, during operation of the shift register, the n-bit hologram pixel value associated with each contiguous group of n light-modulating pixels is provided to each light-modulating pixel of the contiguous group one bit at a time over the course of at least n clock cycles.