Dualitas Ltd

Huan Xu

Neil Collings

There is provided a holographic projector comprising a reflective liquid crystal display device. The reflective liquid crystal display device comprises a light-modulating layer between a first substrate and a second substrate substantially parallel to the first substrate. The light-modulating layer comprises planar-aligned nematic liquid crystals having positive dielectric anisotropy. The first substrate is substantially transparent and comprises a first alignment layer arranged to impart a first pre-tilt angle &#x3b8;on liquid crystals proximate the first substrate, wherein &#x3b8;&#x3e;5&#xb0;. The second substrate is substantially reflective and comprises a second alignment layer arranged to impart a second pre-tilt angle &#x398;on liquid crystals proximate the second substrate, wherein &#x3b8;&#x3e;5&#xb0;. The reflective liquid crystal display device further comprises a plurality of pixels defined on the light-modulating layer having a pixel repeat distance x, wherein x&#x2264;10 &#x3bc;m. The distance d between inside faces of the first substrate and second substrate satisfies 0.5 &#x3bc;m&#x2264;d&#x2264;3 &#x3bc;m, and the birefringence of the liquid crystal &#x394;&#x3b7;&#x2265;0.20. The holographic projector further comprises a display driver arranged to drive the reflective liquid crystal display device to display a hologram by independently-driving each pixel at a respective modulation level selected from a plurality of modulation levels having a phase modulation value.

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Milton Keynes, United Kingdom

Huan Xu