Speckle homogenization in laser projecion display
-
1.
Electronic Engineering College, Xi'an University of Post and Telecommunications, Xi'an 710061, China
-
Corresponding author:
HE Feng-tao, hefengtao@xupt.edu.cn
-
Received Date:
2012-09-16
Accepted Date:
2012-10-29
-
Abstract
In order to solve the problem of uneven brightness and decreased sharpness of the projected image caused by the laser speckle rising from the coherence of the light source in the laser projection display,introducing laser into a vibrating multimode optical fiber,the output laser mode field beats between the various modes at high frequency,and homogenized and incoherent results were obtained.The results show that the speckle contrast ratio of the projected image is significantly reduced to 4% or less,which the human eye is difficult to distinguish.
-
-
References
|
[1]
|
XU Z Y.Laser displays-new display technolody for next generation[J].Laser & Infrared,2006,36(s1):737-741(in Chinese). |
|
[2]
|
HIROAKI S,TOMOHIRO S,ATSUSHI M,et al.Laser TV with newly developed laser light sources[J].SID Symposium Digest of Technical Papers,2008,39(1):854-857. |
|
[3]
|
ZHANG Y,HAO L,LIU H,et al.Principle and realization of laser display technique[J].Optics and Precision Engineering,2006,14(3):402(in Chinese). |
|
[4]
|
YU G,WANG Sh G,YUN J H.Technology of digital speckle pattern interferometry and its applications[J].Laser Technology,2002,26(3):237-240(in Chinese). |
|
[5]
|
ZHANG Y P,WANG K F.Application of Labview and MATLAB in ESPI image processing[J].Laser Technology,2009,33(6):582-585(in Chinese). |
|
[6]
|
NICHOLAS G,ATUL J.Speckle reduction using multiple tones of illumination[J].Applied Optics,1973,12(6):1202-1212. |
|
[7]
|
KI S,ASATANI K.Speckle noise reduction in fiber optic analog video transmission using semiconductor laser diodes[J].IEEE Transactions on Communications,1981,29(7):1017-1024. |
|
[8]
|
LOWENTHAL S,JOYEU D.Speckle removal by a slowly moving diffuser associated with a motionless diffuser[J].Journal of the Optical Society of America,1971,61(7):847-851. |
|
[9]
|
McKECHNIE T S.Reduction of speckle by a moving aperture-first order statistics[J].Optics Communications,1975,13(1):35-39. |
|
[10]
|
RAWSON E G,NAFARRATE A B,NORTON R E,et al.Goodman speckle-free rear-projection screen using two close screens in slow relative motion[J].Journal of the Optical Society of America,1976,66(11):1290-1294. |
|
[11]
|
LI X,LIU W Q,TIAN Zh H,et al.Speckle contrast reduction in laser display[J].Chinese Journal of Liquid Crystals and Displays,2008,23(2):153-154(in Chinese). |
|
[12]
|
WANG L L,TSCHUDI T,HALLDORSSON T,et al.Speckle reduction in laser projection systems by diffractive optical elements[J].Applied Optics,1998,37(10):1770-1775. |
|
[13]
|
GU G Q,WANG K F,YAN X J.Electronic speckle interferometry image processing based on homomorphic filtering[J].Laser Technology,2010,34(6):750-752(in Chinese). |
-
-
Proportional views
-
Map
DownLoad: