• Patent Title: Backlight, multiview display and method having a grating spreader
  • Application No.: US17225963
    Application Date: 2021-04-08
  • Publication No.: US11378729B2
    Publication Date: 2022-07-05
  • Inventor: David A. FattalJoseph D. Lowney
  • Applicant: LEIA INC.
  • Applicant Address: US CA Menlo Park
  • Assignee: LEIA INC.
  • Current Assignee: LEIA INC.
  • Current Assignee Address: US CA Menlo Park
  • Agent J. Michael Johnson
  • Main IPC: F21V8/00
  • IPC: F21V8/00
Backlight, multiview display and method having a grating spreader
Abstract:
A backlight and a multiview display employ a light guide having angle-preserving scattering feature and a grating spreader. The angle-preserving scattering feature is configured to scatter a portion of guided light out of the light guide as emitted light. The grating spreader includes a diffraction grating and is configured to convert light provided by a light source into spatio-angularly homogenous light to be guided as the guided light. The multiview display includes an array of light valves as well as the angle-preserving scattering feature that includes a multibeam element having a size that is comparable to a size of a light valve of the light valve array.
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