A high resolution, full colour, head mounted ferroelectric liquid crystal-over-silicon display

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Abstract
The development of a compact, head mounted display based on ferroelectric liquid crystal-over-submicron CMOS technology is described. The reflective display has an array of 1024 × 768 DRAM pixels with aperture ratios of ∼55% (being upgraded to 75%) and covers an area of 12·3mm × 9·2mm providing a resolution of >2000 lines per inch. Colour images are created using time sequential illumination of binary images displayed on the array of DRAM pixels with light from red (660nm), green (525nm) and blue (470nm) pulsed LEDs. The images are projected into the eye over a field of view of 40° diagonal with less than 4% geometrial distortion. Pictures are presented of XGA images with three red, three green, and two blue bit-frames at a frame rate of 1·2KHz (upgrade 2·5KHz) giving 256 colour hues with full 1024 × 768 pixel resolution in each colour (upgrade 216 hues).