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19 February 2020 Utilisation of micron scale LED arrays as display projection light sources
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In display projection applications, micron scale light emitting diode (μLED) array displays present an alternative to conventional lamps as light sources, with the advantage of higher efficiency and smaller form factor (particularly if the array is monolithic). However, μLEDs without inbuilt optics produce an emission pattern similar to a Lambertian distribution. By employing a pair of microlens arrays aligned to the μLED array to collimate the light, and a relay lens to focus the light onto a display panel, we can produce a display that both serves the same function as a traditional illuminator such as one which might be found in an LCOS or a DMD display, and utilises the addressing of the array to generate light over the desired display area only (zoning), rather than having the entire array be illuminated when the display is active. Using raytracing, we find that such system is limited by the performance of small μLEDs needed and the manufacture of the associated micro-optics.
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Kat Vinden and Samir Mezouari "Utilisation of micron scale LED arrays as display projection light sources", Proc. SPIE 11310, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR), 113100U (19 February 2020);


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