Please wait a minute...
J4  2009, Vol. 43 Issue (8): 1433-1437    DOI: 10.3785/j.issn.1008-973X.2009
    
Thin-film polarizing beam splitters used in liquid crystal projection display
DING Yi1, GU Pei-fu1,2, SUN Xu-tao1, ZHENG Zhen-rong1, ZHANG Yue-guang1, LI Hai-feng1
1. State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China;
2. Keting Optical Technology Inc., Hangzhou 311100, China
Download:   PDF(629KB) HTML
Export: BibTeX | EndNote (RIS)      

Abstract  

In order to improve the energy efficiency and  image contrast of liquid crystal display (LCD) projector, a wide-angle and broadband optical thin-film polarizing beam splitter (PBS) was designed. Several thin-film materials was adopted to achieve multi-kinds of Brewster’s angles. The number and thickness of the films were optimized to obtain the wide-angle and broadband PBS. Using SF57 and SF2 glasses as prism materials, and TiO2, Ta2O5, Al2O3, SiO2 as film materials, four typical PBS multi-layer designs were given based on the above principle and the automatic Needle design method. The layer number of the optimized thin-film is 50~60, and the incident angle in air for the PBS reaches ±10.5°. The measured results showed that the integrated transmittance of P-polarization was 88.0% and 93.4% respectively at wavelength of 420—460 nm and 460—680 nm as well as that of S-polarization was 0.095% at wavelength of 420—680 nm. The PBS can be applied to F/2.8 optical systems to improve their performance obviously.



Published: 28 September 2009
CLC:  O 484  
Cite this article:

DING Yi, GU Pei-Fu, SUN Xu-Chao, et al. Thin-film polarizing beam splitters used in liquid crystal projection display. J4, 2009, 43(8): 1433-1437.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2009     OR     http://www.zjujournals.com/eng/Y2009/V43/I8/1433


用于液晶投影显示的薄膜偏振分束器

为提高液晶投影机的光能利用率和图像对比度,设计了一种宽角度宽波长的光学薄膜偏振分束器(PBS).采用多种薄膜材料产生多个Brewster角,通过优化膜层数目和膜层厚度,获得了宽角度宽波长的PBS.以SF57和SF2玻璃作为棱镜材料,采用TiO2、Ta2O5、Al2O3、SiO2作为薄膜材料,基于上述原理采用全自动的Needle设计方法,设计了4种典型膜系,优化后的膜层数目为50~60层,空气中的光束孔径角达到±10.5°,达到的技术指标为:对于P偏振光,在420~460nm和460~680 nm波长范围内,积分透射率分别达到88.0%和93.4%;而对于S偏振光,在420~680nm波长范围内,积分透射率为0.095%.该PBS应用于F/2.8的光学系统中,能够显著提高整个系统的性能.

[1] MACNEILLE S M. Beam splitter: US, 2,403,731 [P]. 1946-07-09.
[2] 顾培夫,刘旭,唐晋发. 宽波长宽角度偏振分束镜[J].光学仪器, 1999, 21(4/5): 17-21.
GU Pei-fu, LIU Xu, TANG Jin-fa. Design of broadband and wide-angle polarizing beamsplitter [J]. Optical Instruments, 1999, 21(4/5): 17-21.
[3] 章岳光,盛永江,艾曼灵,等. 宽波段宽角度偏振分束薄膜[J]. 光学仪器, 2001, 23(5/6): 198-201.
ZHANG Yue-guang, SHENG Yong-jiang, AI Man-ling, et al. Wideband and wide angle polarizing beam splitter [J]. Optical Instruments, 2001, 23 (5/6): 198-201.
[4] LI H F, HUANG H C, KWOK H S. Broadband, large acceptance angle polarizing beam splitters for reflective LCD projectors [J]. Proceedings of SPIE, 2000, 3954: 186-196.
[5] 姚李英,易葵,杨健,等. 应用于投影显示系统的偏振分光镜的设计和制备[J]. 光学学报, 2002, 22(9): 1116-1118.
YAO Li-ying, YI Kui, YANG Jian, et al. Design and fabrication of polarizing beam splitter for projection display system [J]. Acta Optica Sinica, 2002, 22(9): 1116-1118.
[6] MICHAEL F W, CARL A S, LARRY R G, et al. Giant birefringent optics in multilayer polymer mirrors [J]. Science, 2000, 287: 2451-2456.
[7] STEPHEN E, CHARLES B, DAVID A, et al. 3M PBS for high performance LCoS optical engine [J]. Proceedings of SPIE, 2003, 5002: 106-110.
[8] 厉以宇,顾培夫,李明宇. 利用基于自动复型技术的二维光子晶体模型设计宽角度宽波长偏振分束器[J]. 物理学报, 2005, 54(8): 3889-3893.
LI Yi-yu, GU Pei-fu, LI Ming-yu. Design of wide-angle and broad-band two-dimensional photonic crystal polarization splitter by the automatic shaping mechanism [J]. Acta Physica Sinica, 2005, 54(8): 3889-3893.
[9] 邓云龙,邓华秋,徐晓. 宽角度宽波长偏振分光膜系的设计研究[J]. 激光与红外, 2005, 35(12): 971-973.
DENG Yun-long, DENG Hua-qiu, XU Xiao. Study of broadband and wide-angle polarizing beam splitter design [J]. Laser & Infrared, 2005, 35(12): 971-973.

[1] YUAN Wei, ZHU Li-ping, CAO Ling, YE Zhi-zhen. Effect of Mg content and buffer layer on properties of
ZnMgO: Ga thin films
[J]. J4, 2011, 45(11): 2050-2054.