14 September 2010 Speckle suppression in projection displays by using a motionless changing diffuser
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Proceedings Volume 7387, Speckle 2010: Optical Metrology; 73871Q (2010); doi: 10.1117/12.868117
Event: Speckle 2010, 2010, Florianapolis, Brazil
Abstract
Speckle suppression in projection displays with the laser light source can be achieved by imaging a changing diffuser with random phase cells onto the screen. Theoretical expressions for the speckle contrast in this method have been earlier obtained in the case when different realizations of the phase diffuser produce statistically independent patterns of the light field on the screen [J. W. Goodman]. In the present paper, these expressions are generalized in the case when different realizations of the phase diffuser produce partly correlated speckle patterns. Both cases when the diffuser just fills or overfills the projection optics are considered. Possible structure of a motionless changing diffuser is presented. It includes the dynamic diffractive optical element (DDOE) and a light homogenizer. The DDOE can be based on the electrically controlled spatial light modulator with a deformable polymer layer (SLMDPL). The SLMDPL can handle high light power and therefore, can be used in projection displays with powerful laser beams.
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Vladimir Kartashov, Muhammad Nadeem Akram, "Speckle suppression in projection displays by using a motionless changing diffuser", Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73871Q (14 September 2010); doi: 10.1117/12.868117; https://doi.org/10.1117/12.868117
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KEYWORDS
Diffusers

Diffraction

Speckle

Diffraction gratings

Eye

Laser based displays

Polymers

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