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Investigation of Optimal Photosensor in A-Si:H Liquid Crystal Light Valves

Published online by Cambridge University Press:  21 February 2011

Piyi Du ,
Gaorong Han ,
Jianmin Qiao ,
Weiqiang Han ,
Danmei Zhao  and
Zishang Ding
Piyi Du
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
Gaorong Han
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
Jianmin Qiao
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
Weiqiang Han
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
Danmei Zhao
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
Zishang Ding
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
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Abstract

The a-Si:H thin film is used for a photosensor in liquid crystal light valve(LCLV). A lumped element model for the layered a-Si:H LCLV is developed. It has been shown that the dark and photo-resistances of the a-Si:H photosensor should be adjusted respectively to within the region between one order of magnitude higher and one order of magnitude lower than that of the liquid crystal(LC) layer to ensure a linear variation of the voltage across the LC with the intensity of the incident write-light beam. For obtaining an optimal operation condition of the LCLV, we can determine the concrete values of the dark resistance of the photosensor from the threshold voltage of the LCLV for the linear change of the LCLVs grey level and the applied voltage of the LCLV, and the photoresistance of the photosensor from the saturation voltage of the LC. As a result, the application of an a-Si:H film by optimization of the deposition condition indicates that the contrast of LCLV can be improved distinctively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 258: Symposium A – Amorphous Silicon Technology – 1992 , 1992 , 1175
Copyright
Copyright © Materials Research Society 1992

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References

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