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

JuiWen Pan | Zendy; Chi-Hao Shih | Zendy

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

Author(s) -

JuiWen Pan,

Chi-Hao Shih

Publication year - 2014

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.22.006464

Subject(s) - optics , contrast (vision) , speckle pattern , diffuser (optics) , contrast ratio , projector , speckle noise , laser , speckle imaging , reduction (mathematics) , materials science , physics , mathematics , light source , geometry

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 full-on/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%.

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