College of Photonics, National Yang Ming Chiao Tung University

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Kei-Hsiung Yang

Title:Professor Emeritus

Office Location:
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E-mail:
gkhyang@gmail.com
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Expertise:
LC optics and ions in LCDs, LCOS light valves, digital medical X-ray detectors, embedded touch input technology, FPD packaging technology, EPDs, nonlinear optics, and far-infrared spectroscopy
Research:
LC alignment, LC optics, ions in LCDs, digital medical x-ray imager.

Education

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Publications

Journal Publications
1.Yu-Chen Lo, Kuan-Chieh Huang, Kei-Hsiung Yang, “Computations of Signal-to-Noise Ratio for Medical X-Ray Imaging,” Chinese J. of Physics (to appear in Oct. 2014)
2.Sheng-Ya Wang, Chia-Yi Lin, Kei-Hsiung Yang, “A Simple Method to Measure Pretilt Angles of Inverse Twisted Nematic Liquid Crystal Cells,” accepted for publication in J. of Display Technology (to appear in Aug. 2014)
3.Yao-Chin Wang, Bor-Shyh Lin, Kei-Hsiung Yang “Flaw detection and measurement for 4K Ultra HD thin-film-transistor array panel,” Measurement 51, 236-240(Feb. 2014).
4.Sheng-Ya Wang, Huang-Ming Wu, Kei-Hsiung Yang, “Simple and Direct Measurements of Pretilt Angles in Hybrid-Aligned Nematic Liquid Crystal Cells,” Applied Optics 52(21), 5106-5111 (2013).
5.Sheng-Ya Wang and Kei-Hsiung Yang, “Simple Method to Obtain Accurate Pretilt Angles for Thin Twisted Nematic Liquid Crystal Cells,” Applied Optics 52, No. 2, 219-224 (Jan. 2013).
6.Sheng-Ya Wang, Wei-Hsiang Liao, Kei-Hsiung Yang, “Investigation of Curtain Mura in TFT–TN panels after COG ACF process,” Displays 33, 173–177 (2012).
7.Ting-Hang Pei, Wei-Chou Chen, and Kei-Hsiung Yang, “The Application of the Sawtooth Photonic Crystal on Producing Polarized Light,” IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 23, NO. 18, 1361-1363(2011).
8.Jy-Shan Hsu, Yi-Hsin Lin, Hung-Chun Lin, Kei-Hsiung Yang, “Thermally Induced Light Leakage in In-Plane-Switching Liquid Crystal Displays,” J. of Appl. Phys. Vol. 105, 033503 (2009.

Conference publications (recent 5 years)
1.Sheng-Ya Wang, Chia-Yi Lin, Kei-Hsiung Yang, “Pretilt Angles and Liquid-Crystal Director-Deformation Profile of Inverse Twisted Nematic Liquid Crystal Cells, “SID 2014 Digest, 2386-2388 (June 2014).
2.Chia-Yi Lin, Sheng-Ya Wang, Kei-Hsiung Yang, “Electro-Optical Properties of Inverse Twisted Nematic Cells with Different Pretilt Angles,” SID 2014 Digest, 2439-2441 (June 2014).
3.Sheng-Ya Wang, and Kei-Hsiung Yang, “Direct Measurements on Asymmetric Pretilt Angles of Optically Compensated Bend Nematic Liquid Crystal Cells, “ SID2013 International Conference Digest pp. 1325-1327 at Vancouver, Canada, May, 2013.
4.Kei-Hsiung Yang and Sheng-Ya Wang, invited talk, “Accurate Determination of Pretilt Angles for Thin TN Cells below Gooch-Tarry First Minimum,” at 2nd Symposium in Liquid Crystal Photonics, Chengdu, China, April 2013.
5.Kei-Hsiung Yang, and Sheng-Ya Wang, invited talk, “Accurate Determination of Pretilt Angles for Thin TN Cells below Gooch-Tarry First Minimum,” 2013 China FPD/ASID Conference Proceed., Tech. Session. No. 8, Pudong, Shanghai, Mar. 21, 2013.
6.Siao-Ching Shiu, Chien-Jung Tseng, Kei-Hsiung Yang, Hsu-Kuan Hsu, “Ionic Species and Their Physical Properties in LC Mixtures of Twisted Nematic Liquid Crystal Cells,” 2013 China FPD/ASID Conference Proceed., Tech. Session. No. 4, Pudong, Shanghai, Mar. 21, 2013.
7.Yu-Mei Kuo, Kuan-Chieh Huang, Kei-Hsiung Yang, Hsu-Kuan Hsu,“Investigation of Ionic Effects of a Twisted Nematic Liquid Crystal Cell by Heterodyne-Interferomatric Phase Measurements,” 2013 China FPD/ASID Conference Proceed., Tech. Session. No. 1, Pudong, Shanghai, Mar. 21, 2013.
8.S. Y. Wang, W.-H. Liao, K. –H. Yang, “Investigation of Curtain Mura in TFT-TN Panel,” 2012 SID International Conference at Boston, paper 22.4 (June 6, 2012).
9.Hsin-Hsu Chen, Kei-Hsiung Yang, “New Experimental Results on Electro-Optical Effects of Ionic Impurities in a TN LCD,” ad2011, paper S1-35 (Nov. 2011), Proceed. of China Display/Asia Display 2011, Southeast University Press, p431-434
10.Chih-Hao Kuo, Kei-Hsiung Yang, “Determination of Mobilities and Ion Concentrations of HIR and LIR Impurities in TN LCDs,” ad2011, paper S1-38(Nov. 11), Proceed. of China Display/Asia Display 2011, Southeast University Press, p534-536.
11.Kei-Hsiung Yang, "My thirty-year Investigation of Ions in EPD and LCDs" ad2011, invited paper S1-2(Nov. 11), Proceed. of China Display/Asia Display 2011, Southeast University Press, p25-26
12.Chih Hao Kuo, Wei Hsiang Liao, and Kei-Hsiung Yang, “Analytic Solution of Phase Transfer Function for a General Twist Nematic Cell,” International Conferences on Optics and Photonics in Taiwan, OPT7-O-14(1530), Tainan, Taiwan, ROC, (Dec. 2010).
13.Kei-Hsiung Yang, “Green and Low-Cost LCD Packaging Technologies,” invited talk, FPD2010 China Conference, Shanghai, China (Mar. 2010)
14.Kei-Hsiung Yang, “Smart Bump COG NCF Process for LCD Packages,” invited talk, ASID09, Guangzhou, China (Oct. 2009
15.Ra-Bin Li, Kei-Hsiung Yang, Wei-Chou Chen, “A Novel Method to Determine Optical Parameters of a Twisted Nematic Cell and a EWV Film,” IDW09 LCp3-4, Miyazaki, Japan (Dec. 2009).
16.P. Y. Tang, W. –H. Sun, Kei-Hsiung Yang, “A Novel Composite Bump Design for Chip-on-Glass Package Using Non-Conductive Adhesive Film,” 2009 SID Intl Symp Digest Tech Papers. pp. 834-837 (June 2009), San Antonio, Texas.

Patents

US patents (recent 5 years)
1.US Patent 7,497,611 (Mar. 3, 2009), Polarized light source device and back light module for liquid crystal display.
2.US Patent 7,525,608 no Yang (Apr. 28, 2009), Input display and fabrication method thereof.
3.US Patent 7,525,620 (Apr. 28, 2009), Structure of an optical compensated bend nematic liquid crystal display panel
4.US patent 7,548,300 B2 (Jun. 16, 2009), Fabrication Method of Liquid Crystal Panel and Heating Apparatus Used Therein.
5.US patent 7,626,678 B2 (Dec. 1, 2009), Repairing Method for a Liquid Crystal Display Panel.
6.US patent 8023079 (Sept. 2011), Liquid crystal display.
7.US patent 8027008 (Sept. 2011), Liquid crystal display panel having a touch function.
8.US patent 8223432 (July 17. 2012), optical Sheet, Display Apparatus and Fabrication Thereof,
9.US patent 828417545 (Oct. 2012), Light pointing device employed in input apparatus, driving method and input apparatus using the same.

Advisees

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