Laser speckle reduction by phase range limited computer generated hologram in laser projection display system
Journal
Applied Optics
Journal Volume
53
Journal Issue
27
Pages
G157-G162
Date Issued
2014
Author(s)
Abstract
The speckle phenomenon is an annoyance in laser projection display systems. We propose a novel speckle suppression method that utilizes the interference concept on a pixel point, which reduces the speckle contrast (SC) of the project image by limiting the phase distribution range in the optical field. The SC formula is derived in the uniform interval phase range for partially developed speckle conditions, showing that the SC can be lowered by lessening the phase range limitation. In the ideal simulation model, the SC can be reduced from 98.77% to 0% as the phase range limitation varies from 2π to 0. The phase range limitation model is a novel method using a computer generated hologram to provide beam shaping and phase limitation. In a more realistic simulation model, the SC is reduced from 99.18% to 16.68%. © 2014 Optical Society of America.
Other Subjects
Display devices; Electron holography; Holograms; Holographic displays; Optical projectors; Speckle; Computer generated holograms; Laser projection displays; Phase distribution; Realistic simulation; Simulation model; Speckle contrasts; Speckle phenomenon; Speckle suppression; Computer generated holography
Type
journal article