Speckle reduction and maintaining contrast in a LASER pico-projector using a vibrating symmetric diffuser

Jui-Wen Pan, Chi Hao Shih

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

We proposed a design for a LASER pico-projector with a low speckle contrast value and high contrast ratio that maintains system efficiency. The method for speckle contrast reduction utilizes two diffusers and a Voice Coil Motor (VCM) oscillator. The two different diffusers for a high contrast ratio and high system efficiency can be divided into two categories. In Category 1, the speckle contrast value can be decreased to 2.80% by using a circular symmetric diffuser. At the same time, the fullon/ full-off (FO:FO) contrast ratio can be maintained within 1200:1-1300:1, but the system efficiency decreases 1.50%. In Category 2, the speckle contrast value can be reduced to 6.50% by using an elliptically scattering diffuser. At the same time, the FO:FO contrast ratio can be maintained within 1300:1-1400:1, and the system efficiency decreases by only 1.00%.

Original languageEnglish
Pages (from-to)6464-6477
Number of pages14
JournalOptics Express
Volume22
Issue number6
DOIs
StatePublished - 1 Jan 2014

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