Control circuit design of novel partial gating detector by liquid crystal

Yuan Liang; Yuanhe Tang; Kai Liu; Hanchen Liu; Ruixia Zhang; Haiyang Gao; Gaoxiang Zhao; Qing Li; Na Ye; Xusan Yang

doi:10.1117/12.821770

20 February 2009 Control circuit design of novel partial gating detector by liquid crystal

Yuan Liang, Yuanhe Tang, Kai Liu, Hanchen Liu, Ruixia Zhang, Haiyang Gao, Gaoxiang Zhao, Qing Li, Na Ye, Xusan Yang

Proceedings Volume 7279, Photonics and Optoelectronics Meetings (POEM) 2008: Optoelectronic Devices and Integration; 72791Z (2009) https://doi.org/10.1117/12.821770
Event: Photonics and Optoelectronics Meetings, 2008, Wuhan, China

Abstract

A novel imaging system has been designed in order to enhance the dynamic range of image intensifier, and make it image normally at high illumination based on the principle of liquid crystal for partial gating detection. This system is made up of lens, HTPS TFT-LCD (proximity to the image intensifier), photometric CCD, main CCD and control circuit. Under the high illumination environment, main control chip FPGA extract the output signals of photometric CCD as feedback signals, and get the environmental absolute intensity after some algorithm processing. Then the chip renews the color signals' value of YUV formats. Lastly, the HTPS TFT-LCD drive board receives the processed color signal, controls the transmittance of every pixel on the HTPS TFT-LCD. So the ultra bright partial of image can be weakened. Under the normal or weak light condition, LCD will be moved away by mechanical devices because its transmittance is about 30%. This paper gives the control principle and structure of the system and puts forward the CCD' photometric principle.

Citation Download Citation

Yuan Liang, Yuanhe Tang, Kai Liu, Hanchen Liu, Ruixia Zhang, Haiyang Gao, Gaoxiang Zhao, Qing Li, Na Ye, and Xusan Yang "Control circuit design of novel partial gating detector by liquid crystal", Proc. SPIE 7279, Photonics and Optoelectronics Meetings (POEM) 2008: Optoelectronic Devices and Integration, 72791Z (20 February 2009); https://doi.org/10.1117/12.821770

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