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Light engine with lenticular microlenslet arrays

  • US 10,088,689 B2
  • Filed: 03/13/2015
  • Issued: 10/02/2018
  • Est. Priority Date: 03/13/2015
  • Status: Active Grant
First Claim
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1. A light engine, comprising:

  • at least one light source configured to emit light in an unpolarized state with a non-uniform spatial distribution;

    an entry lenticular microlenslet array (MLA) that is disposed along a light path in the light engine and coupled to receive light from the light source, wherein the entry MLA is tilted to control a direction in which the light is output downstream to a polarization converter;

    the polarization converter having an array of polarization converting cells, the polarization converter disposed along the light path to receive light from the entry lenticular MLA that is focused on the polarization converter, the polarization converter configured to convert unpolarized light from the light source into light having a common state of polarization at an output of the polarization converter; and

    an exit MLA disposed along the light path to receive polarized light from the output of the polarization converter, the exit MLA comprising a microlenslet array configured to focus light on a downstream imaging panel with improved uniformity of spatial distribution relative to the light from the light source.

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