A micro-display must couple light as efficiently as possible into the capture cone defined by the AR waveguide. There is a large efficiency advantage that can be achieved by using micro-lenses over each pixel to bend more light into the capture cone, but only if the light emitters are much smaller than the micro-lens diameter. For a typical pixel pitch of ~3um, this means we want emitters ~1um. This talk with compare different ways to make very small Red pixels for use in micro-displays, including GaN, QD, and AlInGaP based approaches.
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Michael Wiemer (2024) studied this question.
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