摘要(英) |
This paper presents a high-efficiency projector optical design with asymmetric condenser includes an illumination system and an imaging system. In the illumination design use the asymmetric condenser to project LED light source into the lens array. Because of the numerical aperture of lens array in horizontal is different numerical aperture of lens array in vertical direction and if we want to improve the light use efficiency, the numerical aperture of lens array and the numerical aperture of asymmetric condenser must be the same. In DMD illumination area must consider the overfill of the lighting system design, then the output of lens array will be projected onto the DMD illumination area by relay lens. According to, there are three different types of DMD output, respectively On-state, Flat-state, Off-state, we need to use the TIR Prism to control the DMD output and make the light will be projected into the projection lens when DMD is On-state.
In the imaging system optical design, the diagonal of the screen is 60 inches, the diagonal of DMD is 0.4576 inches. We can calculate the magnification is -131.12 times and the projection distance is 2.1 meters. And the effective focal length, f/#, total track of the projection lens is respectively 16.0 mm, 1.8, 2200 mm. Then, we assess resolution of the projection lens at all fields, MTF (66 lp/mm) is greater than 67.3%, lateral color is less than 2.13 m, optical distortion is less than 1.45% and the relative illumination is greater than 90.98%.
Finally, dimensions of the entire projection system are 102.9 mm×99.2 mm×36.0 mm. Assume transmittance of all the elements is 100%, the overall efficiency of red LED projected on the screen is 56.25%, green LED is 49.57%, blue LED is 46.66%. Then, we simulate the uniformity of illuminance on the screen, the average deviation of red LED is 1.78%, green LED is 2.46%, blue LED is 1.97%. And we compare the color gamut with NTSC standard, color saturation of RGB LED is 95.25%. |
參考文獻 |
參考文獻
[1] F. Chen, K. Wang, Z. Qin, D. Wu, X. Luo, and S. Liu, " Design method of high-efficient LED headlamp lens, " Opt. EXPRESS 18, 20926-20938 (2010).
[2] 網路資料: G. Morrison,DLP vs LCD vs LCoS: Projector tech pros and cons,2016 年 6 月 20 日,取自http://www.cnet.com/news/dlp-vs-lcd-vs-lcos-projector-tech-pros-and-cons/
[3] 馬超慧,「口袋型LED投影機系統之光路設計」,國立中央大學光電所,碩士論文,民國九十九年。
[4] Y. C. Fang, W. T. Lin, and H. L. Tsai, “High Definition DLP Zoom Projection Lens Design with TIR Prism for High Definition Television (HDTV),” Proc. SPIE Int. Soc. Opt. Eng. 6342, 63420Z (2006)
[5] X. Zhao, Z. L. Fang, J. C. Cui, X. Zhang, and G. G. Mu, " Illumination system using LED sources for pocket-size projectors," Appl. Opt. 46, 522-526 (2007).
[6] A. Majumder, R. Brown, and H. S. El-Ghoroury, " Display gamut reshaping for color emulation and balancing," IEEE CVPRW. 5543467, 2160-7508 (2010).
[7] T. Ajito, T. Obi, M. Yamaguchi, and N. Ohyama, " Expanded color gamut reproduced by six-primary projection display," Proc. SPIE 3954, 130 (2000).
[8] B. Li , J. Gibson , J. Middendorf , Y. Wang and S. Zhang, " Comparison between LCOS projector and DLP projector in generating digital sinusoidal fringe patterns," Proc. SPIE 8839, 883908 (2013).
[9] Y. C. Huang and J. W. Pan, " High contrast ratio and compact-sized prism for DLP projection system," Appl. Opt. 22, 17016-17029 (2014).
[10] J. W. Pan, S. H. Tu, C. M. Wang, and J. Y. Chang, " High efficiency pocket-size projector with a compact projection lens and a light emitting diode-based light source system," Appl. Opt. 47, 3406-3414 (2008).
[11] R.W.G. Hunt and M.R. Pointer, Measuring Colour, Fourth Edition, Wiley, 2011
[12] D. Malacara, Color Vision and Colorimetry Theory and Applications, Second Edition, SPIE PRESS, 2011
[13] TEXAS INSTRUMENT, "DLP Technology," http://www.ti.com/analog/docs/memsmidlevel.tsp?sectionId=622&tabId=2442. (2012/12/13)
[14] OSRAM, “ LE A Q7WP / LE B Q7WP / LE CG Q7WP,” http://www.osram-os.com/osram_os/en/products/product-catalog/led-light-emitting-diodes/osram-ostar/osram-ostar-projection/osram-ostar-projection-compact/index.jsp. (2015/10/27)
[15] 陳立人,「DLP前投影系統之光路設計」,國立中央大學光電所,碩士論文,民國九十七年。
[16] 洪維毅,「採用非對稱式面積切割型均光系統與LED光源之DLP投影機」,國立中央大學光電所,碩士論文,民國一百零二年。
[17] V. N. Mahajan, Fundamentals of Geometrical Optics, SPIE PRESS, 2014 |