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Student Number 93226036
Author Jane Wang(王楨)
Author's Email Address 93226036@cc.ncu.edu.tw
Statistics This thesis had been viewed 1490 times. Download 1037 times.
Department Optics and Photonics
Year 2005
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Fresnel Computer-Generated Hologram Using TFT Active Matrix Liquid Crystal Display
Date of Defense 2006-07-09
Page Count 54
Keyword
  • hologram
  • liquid crystal
  • Abstract Liquid crystal display (LCD) device utilizes the change of the tilted angle of individual liquid crystal molecules, controlled by the applied voltage, to change the shape of index ellipsoid. Our research uses this change to control the relative phase shift of the incident wavefront and then the phase-modulated light produces a 3-D Fresnel image.
    The characteristics of every liquid crystal display, such as direction of extraordinary axis, twisted angle and tilted angle of liquid crystal, are generally different. At first, we utilize several lights of particular polarizations and particular wavelengths to determine all the above parameters. Then, we use these parameters to establish a phase shift versus gray level table. Finally, base upon this table, we draw a picture of size 1024x768 pixels on the LCD to modulate the phase of the incident light.
    The LCD we use for our research is the type EPSON L3P10X, which can only produce relative phase change for incident wavefront up to 180 degree. Therefore, we use root-mean-square error to choose the proper range of phase modulation. Since our LCD can’t control the phase as well as the amplitude of incident wavefront simultaneously, we then adopt the method of one-dimensional zone plate to generate the desired 3-D image. By dividing the hologram plane into many sections and addressing proper information on each section, the distance of the 3-D image from the LCD device can be shortened. With a series of 3-D images of different viewing angles in hand, we then use “persistence of vision” to demonstrate the animation of a rotating cube.
    Table of Content 摘要.....................................................Ⅰ
    目錄.....................................................Ⅲ
    圖目錄...................................................Ⅴ
    表目錄...................................................Ⅶ
    第一章 導論..............................................1
    第二章 液晶..............................................3
         2.1 液晶簡介........................................3
         2.2 TFT LCD的基本構造及特性...........................5
         2.3 液晶模型的理論推導...............................8
        2.4 各種特殊情形.........................................11
    第三章 各項參數的量測...................................14
        3.1 偏轉角度及快、慢軸方位...........................15
        3.2 灰階值對傾斜角度的影響...........................20
    第四章 近場全像片設計...................................27
        4.1 線段的設計.....................................27
        4.2 相位顯示範圍的選取..............................29
        4.3 方塊的製作.....................................32
           4.3.1 視覺暫留...............................34
           4.3.2 顯示範圍的分割..........................35
           4.3.3 各線段成像的最短距離.....................37
           4.3.4 各線段在全像片上的電場...................40
        4.4 動畫的製作...................................44
        4.5 雜光的移除....................................51
    第五章 結論...........................................53
    Reference 1.K. Lu and B. E. A. Saleh, “Theory and design of the liquidcrystal TV as an optical spatial phase modulator,” Opt. Eng. 29, 240–246 (1990).
    2.J. A. Davis, P. Tsai, K. G. D’Nelly, and I. Moreno, “Simple technique for determining the extraordinary axis direction for twisted-nematic liquid-crystal spatial light modulators,” Opt. Eng. 38, 929–932 (1999).
    3.I. Moreno, N. Bennis, J. A. Davis, and C. Ferreira, “Twist angle determination in liquid-crystal displays by location of local adiabatic points,” Opt. Commun. 158, 231–238 (1998).
    4.J. Coy, M. Zaldarriaga, D. F. Grosz, and O. E. Martinez, “Characterization of a liquid-crystal television as a programmable spatial light modulator,” Opt. Eng. 35, 15–19 (1996).
    5.A. Marquez, J. Campos, M. J. Yzuel, I. Moreno, J. A. Davis, C.Lemmi, A. Moreno, and A. Robert, “Characterization of edge effects in twisted-nematic liquid-crystal displays,” Opt. Eng. 39, 3301–3307 (2000).
    6.J.Amako and T.Sonehara, “Computer-Generated Hologram Using TFT Active Matrix Liquid Crystal Spatial Light Modulator” JJAP.29,1533-1535
    7.H.Kim and Yeon H.LEE,”Uingue measurement of the parameters of a twisted-nematic liquid-crystal display”,Applied Optics,44,1642-1649
    8.C.Soutar and K.Lu, ”Determination of the physical properties of an arbitrary twisted-nematic liquid crystal cell”, Opt. Eng. 33, 2704-2712
    9.J.a.Davis and T.Sonehara, “Transmission variations in liquid crystal spatial light modulators caused by interference and diffraction effects”, Opt. Eng. 38, 1051-1057
    Advisor
  • Yih-Shyang Cheng(鄭益祥)
  • Files
  • 93226036.pdf
  • approve immediately
    Date of Submission 2006-07-24

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