首页|Ultracompact and high-efficiency liquid-crystal-on-silicon light engines for augmented reality glasses
Ultracompact and high-efficiency liquid-crystal-on-silicon light engines for augmented reality glasses
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In lightweight augmented reality(AR)glasses,the light engines must be very compact while keeping a high optical effi-ciency to enable longtime comfortable wearing and high ambient contrast ratio."Liquid-crystal-on-silicon(LCoS)or micro-LED,who wins?"is recently a heated debate question.Conventional LCoS system is facing tremendous challenges due to its bulky illumination systems;it often incorporates a bulky polarizing beam splitter(PBS)cube.To minimize the form-factor of an LCoS system,here we demonstrate an ultracompact illumination system consisting of an in-coupling prism,and a light guide plate with multiple parallelepiped extraction prisms.The overall module volume including the illumina-tion optics and an LCoS panel(4.4-μm pixel pitch and 1024x1024 resolution elements),but excluding the projection op-tics,is merely 0.25 cc(cm3).Yet,our system exhibits an excellent illuminance uniformity and an impressive optical effi-ciency(36%-41%for a polarized input light).Such an ultracompact and high-efficiency LCoS illumination system is ex-pected to revolutionize the next-generation AR glasses.
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