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CPIP Faculty
Photo of Deng-Ke Yang

Deng-Ke Yang
Professor
Liquid Crystal Institute &
Chemical Physics Program
Kent State University
Kent, Ohio 44242
Tel.: (330) 672-2565
Fax: (330) 672-2796
dyang@lci.kent.edu
Yang received his Ph.D. (1989) in Physics from University of Hawaii. He is a member of the Chemical Physics graduate faculty within LCI. His specialities include cholesteric liquid crystals, liquid crystal/polymer composites and electro-optic devices. He is co-inventor of bistable cholesteric display (BCD) technology, currently the world's most promising technology for electronic paper.

Representative Publications

Book
S.-T. Wu, D.-K. Yang, Reflective Liquid Crystal Displays, John Wiley & Sons, Ltd., (2001).

Chapters in book
D.-K. Yang, L.-C. Chien, Y.K. Fung, "Polymer Stabilized Cholesteric Textures: Materials and Application,” in Liquid Crystals in Complex Geometries Formed by Polymer and Porous Networks, G.P. Crawford and S. Zumer, Eds. Taylor & Francis, London (1996), 5, 103-143. Invited.

D.-K. Yang, X.Y. Huang, Y.-M. Zhu, "Bistable Cholesteric Reflective Displays: Material and Drive Schemes," Ann. Rev. Mat. Sci., 27, 117-222 (1996). Invited

Papers published in refereed journals
D.-K. Yang, “A Simulation Study of a Liquid Crystal Optical Switch Based on Total Internal Reflection,” J. Opt. A: Pure Appl. Opt. 5, 402-407 (2003).

J. J. Ge, S.-C. Hong, B.Y. Tang, C.Y. Li, D. Zhang, F. Bai, B. Mansdorf, F.W. Harris, D. Yang, Y.-R. Shen, S.Z.D. Cheng, “Assembly of Photopolymerizable Discostic Molecules on an Aligned Polyimide Layer Surface to Form a Negative Retardation Film with an Oblique Optical Axis,” Advanced Functional Materials, 13, 718-725 (2003).

F. Zhang, D.-K. Yang, “Dynamics of Evolution of Disclinations in Cholesteric Liquid Crystals,” Phys. Rev. E. 66, 041701 (2002).

F. Zhang, D.-K. Yang, “Temperature-Dependence of Pitch and Twist Elastic Constant in Cholesteric to Smectic A Phase Transition,” Liq. Cryst.. 29, 1497-1501 (2002).

F. Zhou, D.-K. Yang, “Simulation Study of an E-Beam Addressed Liquid Crystal Display for Projection,” J. of Information Display, 3, 8-12 (2002).

R.Q. Ma, D.-K. Yang, " Freedericksz Transition in Polymer Stabilized Nematic Liquid Crystals,” Phys. Rev. E. 61, 1567-1573 (2000).

D.-K. Yang, X.-D. Mi, “Modeling of the Reflection of Cholesteric Liquid Crystals Using Jones Matrix,” J. Phys. D. 33, 672-676 (2000).

M. Xu, D.-K. Yang, “Electro-Optical Properties of Dual-Frequency Cholesteric Liquid Crystal Reflective Display and Drive Scheme,” Jpn. J. Appl. Phys. 38, 6827-6830 (2000).

D.-K. Yang, X.-D. Mi, “Modeling of the Reflection of Cholesteric Liquid Crystals Using Jones Matrix,” J. Phys. D. 672-676 (2000).

W.G. Jang, R.-P. Sun, RJ. Twieg, D.-K. Yang, “Dichroic Dye-Doped Bistable Polymer-stabilized Cholesteric-Texture Light Valve,” J. SID. 8, 73-77 (2000).

Y.M. Zhu, D.-K. Yang, "Observation of Pattern Evolution During Homeotropic-Focal Conic Transition in Cholesteric Liquid Crystals," Phys. Rev. Lett., 82, 4855-4858 (1999).

R.Q. Ma, D.-K. Yang, "Optimization of Polymer Stabilized Bistable Black-White Cholesteric Reflective Display," J. SID. 7/1, 61-65 (1999).

J.V. Gandhi, X.-D. Mi, D.-K. Yang, "Effect of Surface Alignment on the Configurational Transitions in Cholesteric Liquid Crystals," Phys. Rev. E, 57, 6761-6766 (1998).

O.D. Lavrentovich, D.-K. Yang, "Cholesteric Cellular Patterns with Electric-Field -Controlled Line Tension," Phys. Rev. E, 57, Rapid Communications, R6269-6272 (1998).

M. Xu, F.D. Xu, D.-K. Yang, "Effects of Cell Structure on the Reflection of Cholesteric Liquid Crystal Display," J. Appl. Phys., 83, 1938-1955 (1998).

X.-D. Mi, D.-K. Yang, "Capillary Filling of Nematic Liquid Crystals," Phys. Rev. E, 58, 1992-2000 (1998).

R.E. Kraig, P.L. Taylor, R.Q. Ma, D.-K. Yang, "Nematic Order in Polymer Stabilized Liquid Crystal," Phys. Rev. E. 58, 4594-4597 (1998).

R.Q. Ma, D.-K. Yang, "Polymer Stabilized Cholesteric Texture Reverse-Mode Light Shutter: Cell design," J. SID, 6/2, 125-130 (1998).

M. Xu, D.-K. Yang, "Dual Frequency Cholesteric Light Shutters," Appl. Phys. Lett., 70, 720-723 (1997).

Y. K. Fung, A. Borstnik, S. Zumer, D.-K. Yang, J.W. Doane, "Pretransitional Nematic Ordering in Liquid Crystals with Dispersed Polymer Networks," Phys. Rev. E, 55, 1637-1654 (1997).

A.Y. Fuh, J.W. Doane, D.-K. Yang, L.C. Chien, "Correlation of Electro-optical and Raman Characteristics of Polymer-Stabilized Cholesteric Texture Films," Mol. Cryst. Liq. Cryst., 304, 65-77 (1997).

X.-Y. Huang, J.W. Doane, D.-K. Yang, "The Transient Response and Dynamic Drive of Cholesteric Liquid Crystal Displays," J. SID, 5/3, 179-187 (1997).

R.-M. Ho, Y. Yoon, M. Leland, S. Cheng, D.-K. Yang, V. Percec, P. Chu, "Phase Identification in a Series of Liquid Crystalline TPP Polyethers and Copolyethers Having Highly Ordered Mesophase Structure," Macromolecules, 29, 4528-4535 (1996).

W.D. St. John, W.J. Fritz, Z.J. Lu, D.-K. Yang, "Optical Properties of Bistable Cholesteric Reflective Displays," Phys. Rev. E, 51, 1191-1198 (1995).

Y.K. Fung, D.-K. Yang, Y. Sun, L.C. Chien, S. Zumer, J.W. Doane, "Polymer Networks Formed in Liquid Crystals," Liq. Cryst., 19, 797-901 (1995).

X-Y. Huang, D.-K. Yang, J.W. Doane, "Transient Dielectric Study of Bistable Reflective Cholesteric Displays and Design of Rapid Drive Scheme," Appl. Phys. Lett. 69, 1211-1213 (1995).

L.C. Chien, M.F. Nabor, U. Muller, N. Leroux, D.-K. Yang, J.W. Doane, M.N. Walz, C.M. Citano, "Recent Advance in Materials for Polymer Stabilized Liquid Crystals," Polym. Mat. Sci. Eng. 72, 492 (1995).

X-Y. Huang, D.-K. Yang, P.J. Bos, J.W. Doane, "Dynamic Drive for Bistable Cholesteric Displays: a Rapid Addressing Scheme," J. SID 3/4, 165-168 (1995).

D.-K. Yang, J.L. West, L.C. Chien, J.W. Doane, "Control of the Reflectivity and Bistability in Displays Based on Cholesteric Liquid Crystals," J. Appl. Phys., 76, 1331-1333 (1994).

D.-K. Yang, J.W. Doane, Z. Yaniv, J. Glasser, "Cholesteric Reflective Display: Drive Scheme and Contrast," Appl. Phys. Lett., 65, 1905-1907 (1994).

Z.J. Lu, D.-K. Yang, "Effects of Chiral Adopant on the Performance of PDLC," Appl. Phys. Lett., 65, 505-507 (1994).


Papers published in refereed proceedings
F. Zhou, D.-K. Yang, “Wavelength Divided Trans-Reflective Liquid Crystal Display,” SID Intnl. Digest Tech. Papers, XXXIV, 82-85 (2003).

D.-K. Yang, Z.J. Lu, L.C. Chien, J.W. Doane, “Bistable Polymer Dispersed Cholesteric Reflective Display,” SID Intnl. Digest Tech. Papers, XXXIV, 959-961 (2003).

H. Kubota, D.-K. Yang, T. Uemura, Y. Takuba, J.R. Kelly, “Simulation Study of Light Emission of a Backlight System with a Broad Band Cholesteric Liquid Crystal Polarizer,” SID Intnl. Digest Tech. Papers, XXXIII, 333-335 (2002).

F. Zhang, D.-K. Yang, “Polymer Stabilized Cholesteric Dichroic Dye Displays,” SID Intnl. Digest Tech. Papers, XXXIII, 469-471 (2002).

D.-K. Yang, “Optical Properties and Drive Schemes of Bistable Reflective Cholesteric Displays,” Proc. Of China Flat Panel displays’2002, 20-23 (2002).

A. Khan, N. Miller, F. Nicholson, R. Armbruster, J.W. Doane, D. Wang, D.-K. Yang, “Dynamically Driven Polymer Stabilized Black and White Cholesteric Liquid Crystal Display,” Proc. Intl. Display Workshop, 1348-1352 (2002).

W.G. Jang, D.-K. Yang, “Optimization of Dichroic Dye-Doped Bistable Polymer-Stabilized Cholesteric-Texture Light Valve,” Proc. 1st International. Meeting on Information Display, 20 (2001).

X.-D. Mi, D.-K. Yang, “Ionic Effects in Bistable Reflective Cholesteric Liquid Crystals,” SID Intnl. Digest Tech. Papers, XXXI, 823-825 (2000).

R.-P. Sun, D.-K. Yang, “Fast Drive Scheme for Polymer Stabilized Cholesteric Texture Display,” Conf. Rec. 20th Intl. Display Research Conference, 34-37 (2000).

M. Xu, D.-K. Yang, "Dual Frequency Cholesteric Liquid Crystal Reflective Display," Proceedings of SPIE, 3635, 80-85 (1999).

X.-D. Mi, M. Xu, D.-K. Yang, P.J. Bos, "Effects of Pretilt Angle on Electro-Optical Properties of Pi-Cell LCDs," SID Intnl. Digest Tech. Papers, XXX, 24-27 (1999).

R. Su, W. Jang, D.-K. Yang, "Optimization of Polymer Stabilized Cholesteric Texture Materials for High-Brightness Projection Displays," SID Intnl. Digest Tech. Papers, XXX,652-655 (1999).

M. Xu, D.-K. Yang, "Optical Properties of the Gray-Scale States of Cholesteric Reflective Displays," SID Intnl. Digest Tech. Papers, XXX, 950-953 (1999).

B. Taheri, J.L. West, D.K. Yang, " Recent Development in Bistable Cholesteric Displays," Proc. of SPIE, 3297, 115-121 (1998).

J. Gandhi, D.-K. Yang, "Temperature Compensation of the Dynamic Drive Scheme for Bistable Cholesteric Displays," SID Intnl. Digest Tech. Papers, XXIX, 794-797 (1998).

Y.-M. Zhu, D.-K. Yang, "Cumulative Drive Scheme for Bistable Reflective Cholesteric Lcds," SID Intnl. Digest Tech. Papers, XXIX, 798-801 (1998).

X.-Y. Huang, N. Miller, A. Khan, D. Davis, J.W. Doane, D.-K. Yang, "Gray Scale of Bistable Reflective Cholesteric Displays," SID Intnl. Digest Tech. Papers, XXIX, 810-813 (1998).

X.-D. Mi, D.-K. Yang, "Cell Designs for Fast Reflective Cholesteric LCDS," SID Intnl. Digest Tech. Papers, XXIX, 909-912 (1998).

M. Xu, D.-K. Yang, J. Bos, X. Jin, F. W. Harris, S. Z. D. Cheng, "Very High Pretilt Alignment and its Application in Pi-Cell LCDs," SID Intnl. Digest Tech. Papers, XXIX, 139-141 (1998).

J. Gandhi, D.-K. Yang, X.-Y. Huang, N. Miller, "Gray Scale Drive Schemes for Bistable Cholesteric Reflective Displays," Proc. Asia Display' 98, 127-130 (1998).

R.Q. Ma, D.-K. Yang, " Polymer Stabilized Bistable Black-White Cholesteric Reflective Display," SID Intnl. Digest Tech. Papers XXVIII, 101-104 (1997).

Y.-M. Zhu, D.-K. Yang, "High Speed Dynamic Drive Scheme for Bistable Reflective Cholesteric Displays,", SID Intnl. Digest Tech. Papers XXVIII, 97-100 (1997).

X.-Y. Huang, D.-K. Yang, M. Stefanov, J.W. Doane, "High-Performance Dynamic Drive Scheme for Bistable Reflective Cholesteric Displays," SID Intnl. Digest Tech. Papers XXVII, 359-362 (1996).

W. Sautter, R. Bunz, R. Harjung, E. Lueder, D.-K. Yang, J.W. Doane, "A Reflective Mim-Addressed Psct Display Suited for Video Application," Proc. Eurodisplay '96, 523-526 (1996).

D.-K. Yang, Z.-J. Lu, "Switching Mechanism of Bistable Cholesteric Reflective Displays," SID Intnl. Digest Tech. Papers XXVI, 351-354 (1995).

X.-Y. Huang, D.-K. Yang, P. Bos, J.W. Doane, "Dynamic Drive for Bistable Reflective Cholesteric Displays: A Rapid Addressing Scheme," SID Intnl. Digest Tech. Papers XXVI, 347-350 (1995).

Z.-J. Lu, W.D. St. John, X.-Y. Huang, D.-K. Yang, J.W. Doane, "Surface Modified Reflective Cholesteric Displays," SID Intnl. Digest Tech. Papers XXVI, 172-175 (1995).

M. Pfeiffer, D.-K Yang, J.W. Doane, R. Bunz, E. Luder, "A High Information Content Reflective Cholesteric Display," SID Intnl. Digest Tech. Papers XXVI, 706-709 (1995).

Z. Yaniv, C. Catchpole, M. H. Lu, R. Bunz, E. Lueder, M. Pfeiffer, D.-K. Yang, J. W. Doane, "Electronic Newspaper Display," Proc. Asia Display' 95, 113-116 (1995).

J.W. Doane, D.-K. Yang, M. Pfeiffer, "Polymer Modified and Stabilized Cholesteric Liquid Crystal Materials for Flat Panel Application," Proc. Macromol. Symp., 96, 51 (1995).

D.-K. Yang, Y.-M. Zhu, C. Boulic, "Effect of Dichroic Dye on Polymer Stabilized Cholesteric Texture Light Shutter," Proc. Asia Display' 95, 51-54 (1995).

M. Pfeiffer, Y. Sun, D.-K. Yang, J.W. Doane, W. Sautter, E. Lueder, Z. Yaniv, "Design of PSCT Materials for MIM Addressing," SID Intnl. Digest Tech. Papers XXV, 837-840 (1994).

W.J. Fritz, W.D. St. John, D.-K. Yang, J.W. Doane, "Reflective Color of PSCT Displays," SID Intnl. Digest Tech. Papers XXV, 841-844 (1994).

J.W. Doane, W.D. St. John, Z.J. Lu, D.-K. Yang, "Stabilized and Modified Cholesteric Liquid Crystals for Reflective Displays," Proc. Intnl. Display Res. Conf., 65-68 (Oct. 1994).

Papers published in un-refereed proceedings
D.-K. Yang, F. Zhou, “Wavelength Divided Trans-Reflective Liquid Crystal Displays,” Proceeding of International Meeting on Information Display, 309-310 (2003)

D.-K. Yang, A. Khan, J.W. Doane, “Cholesteric Liquid for Reflective Displays,” Proceedings of International. Mini-Conference on Information Electronics System, 161-163 (2003).

R.Sun, D.-K. Yang, "A Novel Drive Scheme for Polymer Stabilized Cholesteric Texture Display," ALCOM Tech Report XI, 7113-117 (2000).

F. Zhang, J. Kim, M. Neubert, D.-K. Yang, "Polymer Stabilized Cholesteric Dichroic Dye Displays," ALCOM Tech Report XI, 119-126 (2000).

R. Chen, D.-K. Yang, "Electro-Optical Properties of Polymer Stabilized Cholesteric Texture Normal-Mode Light Shutter from Flexible Monomers," ALCOM Tech Report XI, 223-229 (2000).

R. Sun, D.-K. Yang, “Polymer Stabilized Cholesteric Texture Materials for Projection Display,” ALCOM Technical Jrnl, X, 19-26 (1999).

R.-Q. Ma, D.-K. Yang, “SEM Study of the Polymer Network Formed in Liquid Crystals,” ALCOM Technical Jrnl, X, 73-78 (1999).

S. Gu, R. J. Twieg, R. Ma, D.-K. Yang, “Phenylglyoxylate Liquid Crystal: Synthesis, Mesogenic Properties and Application as Free-Radical Photoinitiator,” ALCOM Technical Jrnl, X, 157-162 (1999).

O.D. Lavrentovich, D.-K. Yang, "Oily Streaks in Cholesteric Planar-Focal Conic Transition," ALCOM Technical Jrnl IX, 11-22 (1997).

X.-D. Mi, J. V. Gandhi, D.-K. Yang, "Effects of Surface Anchoring on the Homeotropic-Planar Transition in Cholesteric Liquid Crystals," ALCOM Technical Jrnl IX, 23-32 (1997).

R.-Q. Ma, D.-K. Yang, "Fast Polymer Stabilized Cholesteric Texture Normal-Mode Light Shutter," ALCOM Technical Jrnl IX, 51-60 (1997).

M. Xu, D.-K. Yang, "Fast Switching Method for Cholesteric Liquid Crystal Light Shutters," ALCOM Technical Jrnl IX, 61-68 (1997).

R. E. Kraig, P. L. Taylor, R.-Q. Ma, D.-K. Yang, "Nematic Order in Polymer Stabilized Liquid Crystals," ALCOM Technical Jrnl IX, 73-78 (1997).

R.M. Ho, Y. Yoon, F. Li, F.W. Harris, S.Z.D. Cheng, D.-K. Yang, V. Percec, P. Chu, "Surface Induced Orientation and Order in a Series of Main-Chain Liquid Crystalline Polyethers," ALCOM Technical Jrnl VIII, 75-82 (1996).

Y.M. Zhu, D.-K. Yang, "Pattern Formation in Homeotropic-Focal Conic Transition of Cholesteric Liquid Crystal with Dispersed Polymer Network," ALCOM Tech. Jrnl. VII, 128-135 (1995).

D.-K. Yang, Z.J. Lu, P. Palffy-Muhoray, "Dynamics of Relaxation from Field-Induced Homeotropic State in Cholesteric Liquid Crystals," ALCOM Tech. Jrnl. VII, 13-29 (1995).

W.D. St. John, W.J. Fritz, Z.-J. Lu, D.-K. Yang, "Optical Properties of Bistable Cholesteric Reflective Displays," ALCOM Tech. Jrnl. V, 124-135 (1994).

M. Pfeiffer, D.-K. Yang, J.W. Doane, R. Bunz, E. Lueder, C. Catchpole, Z. Yaniv, "A 14-Inch Truly Reflective Psct Display: The Viewer," ALCOM Tech. Jrnl. V, 120-123 (1994).

M. Pfeiffer, Y. Sun, D.-K. Yang, J.W. Doane, W. Sautter, V. Hochholzer, E. Ginter, E. Lueder, "PSCT-AM-MIM Display Prototypes," ALCOM Tech. Jrnl. V, 115-119 (1994).

Z.Z. Zhong, D.E. Schuele, D.-K. Yang, "Polymer Stabilized Cholesteric Texture: An Electrical Aspect," ALCOM Tech. Jrnl. V, 89-91 (1994).

X-Y. Huang, D.-K. Yang, "Dynamic Dielectric Study of Transitions from Homeotropic State of Cholesteric Liquid Crystals," ALCOM Tech. Jrnl. VI, 122-129 (1994).

Z.Z. Zhong, D.E. Schuele, D.-K. Yang, "Polymer Stabilized Cholesteric Texture: A Dynamic Aspect," ALCOM Tech. Jrnl. VI, 68-74 (1994).

Y.K. Fung, Y. Sun, M. T. Pfeiffer, D.-K. Yang, J.W. Doane, "Polymer Stabilized Cholesteric Texture Light Valves," ALCOM Tech. Jrnl. VI, 52-56 (1994).

D.E. Schuele, Z.Z. Zhong, D.-K. Yang, "Electric Behavior of a PSCT System During Photo-Polymerization," ALCOM Tech. Jrnl. VI, 33-42 (1994).

Z.-J. Lu, D.-K. Yang, J.W. Doane, "Surface Modified Bistable Cholesteric Liquid Crystal Reflective Display," ALCOM Tech. Jrnl. VI, 115-121 (1994).

Y.K. Fung, D.-K. Yang, Y. Sun, L.C. Chien, S. Zumer, J.W. Doane, "Polymer Networks Formed in Liquid Crystals," ALCOM Tech. Jrnl. VI, 11-18 (1994).

Background image: Hybrid Aligned Nematic Film
Copyright photo courtesy of Professor Oleg D. Lavrentovich

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