Patent · US Active

Waveguide array illuminator with light scattering mitigation

US11555960B1 · kind B1 · utility

0Cited by
5References
20Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 27, 2021
Grant dateJan 17, 2023
Priority date—
Expiry dateSep 27, 2041

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B6/34
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

A waveguide illuminator includes an input waveguide, a waveguide splitter coupled to the input waveguide, and a waveguide array coupled to the waveguide splitter. The waveguide array includes an array of out-coupling gratings that out-couple portions of the split light beam to form an array of out-coupled beam portions for illuminating a display panel. The out-coupling gratings may be apodized to reduce light scattering by the gratings. Additionally, gaps between the out-coupling gratings along the waveguides may be filled by gap gratings and/or etched grooves running parallel to the waveguides.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.