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博碩士論文 etd-0826111-170430 詳細資訊
Title page for etd-0826111-170430
論文名稱
Title
雙橢球反射光學特性量測法
Methods of optical measurements based on the reflection of a double-ellipsoid structure
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
68
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2011-07-14
繳交日期
Date of Submission
2011-08-26
關鍵字
Keywords
預傾角、液晶層厚度、焦錐干涉、垂直配向液晶盒、光色散、雙橢球結構
Liquid-crystal cell gap, Pretilt angle, Vertical alignment liquid-crystal cell, Conoscopy, Double-ellipsoid structure, Light dispersion
統計
Statistics
本論文已被瀏覽 5671 次,被下載 512
The thesis/dissertation has been browsed 5671 times, has been downloaded 512 times.
中文摘要
本論文中我們提出一雙橢球結構(double-ellipsoid structure)的光學量測系統。藉由雙橢球結構量測系統,可以改善面板光學量測過程中的耗時與光色散(dispersion)的缺陷。亦可以減少光大角度入射時的介面反射損耗,進而達成快速量測與提高量測之準確度。另外,利用雙橢球結構之光學量測之焦錐干涉(conoscopy)結果,我們可求得在離軸(off-axis)上的暗態光學分布趨勢,進而計算出垂直配向液晶盒(vertical alignment liquid-crystal cell)之液晶層厚度(liquid-crystal cell gap)與液晶分子排列的預傾角(pretilt angle)。此橢球結構光學特性之量測方法具有快速量測與高量測精確度適合未來顯示器上之光學量測。
Abstract
In this study, a double-ellipsoid structure is proposed for measurements of optical properties of liquid-crystal displays (LCDs). By using the double-ellipsoid structure, light dispersion and measurement time, which occurs during the measurement of optical properties of LCDs, can be greatly reduced. The system also significantly decreases reflective loss on interface, increasing the accuracy of the measurement. Moreover, by using the conoscopy measured from the proposed structure, light distribution of the dark state along off-axis direction can be analyzed. Based on the analysis, the cell gap and pretilt angle of vertical alignment liquid-crystals (VA-LCs) are evaluated. The proposed structure, which exhibits a fast and high accuracy measurement, is highly promising for future optical measurement of LCDs.
目次 Table of Contents
摘要 ………………………………………………………………………………………….. i
Abstract …………………………………………………………………………………….... ii
誌謝 ……………………………………………………………………………………….... iii
Table of Contents ………………………………………………………………………...…. iv
List of Figures ……………………………………………………………………………..... vi
List of Tables …………………………………………………………………….……..…… ix

Chapter 1 Introduction ………………………………………………………………………. 1
1.1 Preface …………………………………………………………………………………….1
1.2 Display measurement technologies ………………………………………...……………..2
1.2-1 Goniometric instrument …………………………………………………………….2
1.2-2 Conoscopy …………………………………………………………………………..3
1.3 Motivation and objective ………………………………………………………………….5
1.4 Organization of thesis ……………………………………………………………………..5

Chapter 2 Principles …………………………………………………………………………. 6
2.1 Introduction ……………………………………………………………………………….6
2.2 Geometric properties of ellipse …………………………………………………………...6
2.2-1 Eccentricity …………………………………………………………………………7
2.2-2 Polar form relative to focus …………………………………………………………8
2.2-3 Concept of con-focal ellipses …………………………………………………….....9
2.3 Definition of viewing angle for display …………………………………………………10
2.4 Optical birefringence …………………………………………………………………….11
2.4-1 Uniaxial medium …………………………………………………………………..13
2.5 Jones calculus ……………………………………………………………………………14
2.5-1 Matrix representation ……………………………………………………………...14
2.5-2 Transmissive TN Cells …………………………………………………………….16
2.6 Summary ………………………………………………………………………………...20

Chapter 3 Design and Manufacture ……………………………………………..………….. 21
3.1 Introduction ……………………………………………………………………………...21
3.2 Prototype structure ………………………………………………………………………21
3.3 Optimized structure ……………………………………………………………………...23
3.4 Theoretical calculation for structure ……………………………………………………..25
3.4-1 Writing process by Matlab ………………………………………………………...25
3.4-2 Computing results …………………………………………………………………31
3.5 Manufactured device …………………………………………………………………….32
3.6 Summary ………………………………………………………………………………...32

Chapter 4 Measurement and Experimental results …………………………………………. 33
4.1 Introduction ……………………………………………………………………………...33
4.2 Original measurement …………………………………………………………………...33
4.2-1 Measuring instructions ………………………………………………………….....33
4.2-2 Discussions ………………………………………………………………………..35
4.3 Backlight and Optical layout …………………………………………………………….36
4.4 Iso-contrast ratio contour measurements ………………………………………………...38
4.5 Cell gap measurements …………………………………………………………………..42
4.5-1 Multi-wavelength interferometry ………………………………………………….42
4.5-2 Phase retardation method ………………………………………………………….44
4.5-3 Experimental results ……………………………………………………………….46
4.6 Pretilt angle measurements ………………………………………………………………50
4.7 Summary ………………………………………………………………………………...53

Chapter 5 Conclusions and Future works ……………………………………………..…… 54
5.1 Conclusions ……………………………………………………………………………...54
5.2 Future works ……………………………………………………………………………..54

References ………………………………………………………..……………………….... 55
參考文獻 References
[1] BA665 BLU_LCD measurement system, reference recommended by the Nieo E.O.Inc. Hsinchu, DC: Nieo E.O.Inc. Retrieved March 12, 2011, from the World Wide Web: http://www.nieoeo.com.tw
[2] SDV-850W 3Dimensional view angle measurement system, reference recommended by the Nieo E.O.Inc. Hsinchu, DC: Nieo E.O.Inc. Retrieved March 12, 2011, from the World Wide Web: http://www.nieoeo.com.tw
[3] B. L. Van Horn and H. H. Winter, “Analysis of the conoscopic measurement for uniaxial liquid-crystal tilt angles,” Appl. Optics, Vol. 40, pp. 2089-2090, 2001.
[4] Elements of an ellipse, reference recommended by the Wikipedia Free Encyclopedia, DC: Wikipedia Free Encyclopedia, Retrieved March 22, 2011, from the World Wide Web: http://en.wikipedia.org/wiki/Ellipse
[5] Eccentricity, reference recommended by the Wikipedia Free Encyclopedia, DC: Wikipedia Free Encyclopedia, Retrieved March 22, 2011, from the World Wide Web: http://en.wikipedia.org/wiki/Ellipse
[6] Polar form relative to focus, reference recommended by the Wikipedia Free Encyclopedia, DC: Wikipedia Free Encyclopedia, Retrieved March 22, 2011, from the World Wide Web: http://en.wikipedia.org/wiki/Ellipse
[7] Pochi, Y., and Claire, G., Optics of Liquid Crystal Displays, 2nd ed., Wiley, New York., 1999.
[8] Birefringence in Liquid crystal, reference recommended by the Polymers and Liquid Crystals. (1997, May). Cleveland, DC: Polymers and Liquid Crystals. Retrieved April 15, 2011, from the World Wide Web: http://plc.cwru.edu/tutorial/enhanced/files/lc/biref/biref.htm
[9] L. Dumitraşcu, L. Dumitraşcu, D.-O. Dorohoi and M. Toma, “Interferometric method for birefringence determination with a polarizing microscope,” Opt. Express, Vol. 16, pp. 20885-20886, 2008.
[10] X. Zhu, Z. Ge, and S.T. Wu, “Analytical Solutions for Uniaxial-Film Compensated Wide-View Liquid Crystal Displays,” J. Display Technol. 2, 2, 2006.
[11] Stephen A. N. (2010), Earth & Environmental Sciences 2110, MINERALOGY: Introduction to Uniaxial Minerals. Retrieved May 26, 2011, from the World Wide Web: http://www.tulane.edu/~sanelson/eens211/uniaxial_minerals.htm
[12] F. Pedrotti, and L. Pedrotti, Introduction to Optics, 2nd ed., Prentice-Hall, New Jersey., 1993.
[13] E. Collett, Field Guide to Polarization, 1st ed., SPIE Press Book, Bellingham, 2005.
[14] A. Lien, “Extended Jones Matrix Representation for the Twisted Nematic Liquid-Crystal Display at Oblique Incidence,” Appl. Phys. Lett., Vol. 57, pp. 2767-2769, 1990.
[15] Luminance contrast, reference recommended by the Wikipedia Free Encyclopedia, DC: Wikipedia Free Encyclopedia, Retrieved May 13, 2011, from the World Wide Web: http://en.wikipedia.org/wiki/Display_contrast
[16] Inoue, “Method of Measuring Thickness of Liquid Crystal Cells,” U.S. Patent 5 239 365, 1993.
[17] S. Sato, Y. Zhou, Z. He, and Togashi, “Method of Determining Cell Thickness and Twist angle Parameters of Liquid Crystal Cell,” U.S. Patent 5 966 195, 1995.
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