Philip Bos

Deng-ke Yang

Oleg Lavrentovich

L.-C. Chien

Peter Palffy-Muhoray

Jonathan Selinger

Robin Selinger

Antal Jakli

Chanjoong Kim

Qi-Huo Wei

Philip Bos

Statement of Interest

• The focus of my work is applications of liquid crystals. This leads to interests in modeling, material properties, and interactions of liquid crystals with surfaces.

Video About Current Lab Activities

http://realserver.lci.kent.edu/ramgen/cpip_lab_intros_2008/cpip_2008_lab_introduction_phil_bos.rm

CV / website

• http://www.lci.kent.edu/PI/BosP.htm
• I also have a site: http://boslab.lci.kent.edu, but…. this has not been updated in a long time

Research Interests

• Surface alignment of liquid crystals
• Electro-optical interaction of liquid crystals

Applications interests

• Optical Wavefront control, including electro-optical beam steering and lenses
• Optical filters
• Fast Switching Devices
• Improved viewing angle displays
• Low Power, optically efficient Displays
• Sensors

Interests in potential industrial interactions

• Research / Development topics
  • I’d be glad to talk about anything that has to do with applications of liquid crystals, but especially if it is a new or improved way to use liquid crystals
  • Lab facilities of potential interest to IPP members.
  • My lab has capabilities for most aspects of the characterization of LC devices.
  • Topics that could address as consultant
  • Applications of liquid crystals

Current Graduate Students

• Lie Shi
• Mike Dorjgotov
• Yi Huang
• Liwei Li

Recent publications (7/07-6/08)

Publications in Peer Reviewed Journals:

Yong-Kyu Jang, Philip Bos, “Universal off-axis light transmission properties of the bright state in perfectly compensated liquid crystal devices”, Journal of Applied Physics, 102, 2007.

Yong-Kyu Jang, Philip Bos, “Optimization of the white state director configuration for perfectly compensated pi-cell devices” Japanese Journal of Applied Physics, 46, 2007

P. J.Bos, H. Garcia, V, Sergan, “Wide-angle achromatic prism beam steering for infrared countermeasures and imaging applications: solving the singularity problem in the two-prism design” , Optical Engineering, 46, 2007

Yong-Kyu Jang, Philip Bos, “Comparison and analysis of off-axis color shift properties of compensated liquid crystal devcies” Japanese Journal of Applied Physics, 46, 2007

Cheng Chen and Philip Bos, “Anchoring transitions of liquid crystals on SiOx”, Liquid Crystals, 35, 2008

Books and Chapters in Books

Co-editor of book: “ Mobile Displays, technology and applications” Achintya Bhowmik, Zili Li, Philip Bos, Wiley (2008)

Chapter in book : Achintya Bhowmik, Zili Li, Philip Bos “ Introduction to mobile display technologies” Chapter 1 in “ Mobile Displays, technology and applications” Achintya Bhowmik, Zili Li, Philip Bos, Wiley (2008)

Conference Proceedings and Technical Reports

Mike Dorjgotov, Philip Bos,”Liquid Crystal Etalon Device for Reflective Displays” Society for Information Display 2008 International Symposium, Digest of Technical Papers, XXXIX, p568-571

Mitya Reznikov, Bentley Wall, Mark Handschy, Philip Bos, “ Mono domain alignment of the SmC liquid crystalline phase for analog display applications” Society for Information Display 2008 International Symposium, Digest of Technical Papers, XXXIX, p 1811-1814,

Yi Huang, K.H. Kim, J.K Jang, H.S Kim and Philip Bos, “Dynamic simulation of Pi-cell liquid crystal displays with transverse field” , Society for Information Display 2008 International Symposium, Digest of Technical Papers, XXXIX, p1865-1869,

Talks , Seminars and Overview Articles

“Fast-Switching Liquid Crystal Effects for Displays” Information Display, September, 2007 p20

Mike Dorjgotov, Philip Bos,”Liquid Crystal Etalon Device for Reflective Displays” Society for Information Display 2008 International Symposium, , Los Angeles, CA, May 19-23, 2008

Mitya Reznikov, Bentley Wall, Mark Handschy, Philip Bos, “ Mono domain alignment of the SmC liquid crystalline phase for analog display applications” Society for Information Display 2008 International Symposium, , Los Angeles, CA, May 19-23, 2008.

Yi Huang, K.H. Kim, J.K Jang, H.S Kim and Philip Bos, “Dynamic simulation of Pi-cell liquid crystal displays with transverse field” , Society for Information Display 2008 International Symposium, , Los Angeles, CA, May 19-23, 2008.

Patents Awarded

“Birefringent Filter-Based Color Generation Scheme for a Passive Matrix Display Device”, P. Bos and S. Saeed, .US patent 7,289,189 issued 10-30-2007,

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Deng-Ke Yang

Statement of Interest

• My research interest is in liquid crystals and liquid crystal/polymer composites, particularly interested in developing liquid crystal electro-optical devices, investigating interaction between liquid crystal and polymer and exploring chiral liquid crystals.

Current Lab Activities

• Developing liquid crystal switchable goggles
• Developing liquid crystal switchable windows for privacy and energy flow control
• Developing cholesteric liquid crystal from biological materials
• Developing compensation films for large viewing angle LCDs

CV / website

• http://www.lci.kent.edu/PI/DkYang.htm

Research Interests

• Electro-optical liquid crystal devices
• Liquid crystal/polymer composites: physics and applications

Applications interests

• Liquid crystal goggles
• Reflective liquid crystal display
• Flexible liquid crystal display
• Switchable window
• Large viewing angle liquid crystal display: compensation films and liquid crystal modes

Interests in potential industrial interactions

• Research / Development topics
  I would be glad to collaborate with industrials in the following areas:
  
  • Switchable liquid crystal goggle
  • Switchable liquid crystal light shutter and window
  • Reflective liquid crystal display
  • Flexible liquid crystal display
  • Modeling electro-optical properties of liquid crystal devices
  • Lab facilities of potential interest to IPP members.
  • My lab has capabilities for most aspects of the characterization of LC devices.
  • Topics that could address as consultant

Current Postdoctoral Fellow and Graduate Students

• Young-Cheol Yang (Postdoc.)
• Shawn Hurley
• Sarah Hicks
• Rafael Zola

Awards

• Information Display Society Special Recognition Award
  For pioneering work on polymer stabilized devices and reflective displays, 2005.
• Information Display Society Fellow
  For significant scientific and technological contributions to bistable, reflective cholesteric displays and to polymer-stabilized cholesteric devices, and for his outstanding contributions to education in the field of liquid crystal technology, 2007.

Recent publications

Book

Chapters in book

1. D.-K. Yang, L.-C. Chien and Y.K. Fung, "Polymer stabilized cholesteric textures: materials and application,” in Liquid crystals in Complex Geometries Formed by Polymer and Porous Networks, ed. G.P. Crawford and S. Zumer, Taylor & Francis, London (1996), Chapter 5, 103-143.

2. D.-K. Yang, X.Y. Huang and Y.-M. Zhu, "Bistable cholesteric reflective displays: Material and Drive Schemes," Annual Review of Materials Science, 27, 117-222 (1996).

3. D.-K. Yang, “Reflective cholesteric liquid crystal displays,” in Mobile Displays, ed. A. Bhowmik, Z. Li and P. J. Bos, John Wiley & Sons, Ltd., (2008), Chapter 16, 443-466.

Papers

1. D-K, Yang, “Flexible bistable cholesteric reflective displays,” J. Display Technology, 2, 32-37 (2006).

2. K.-U Jeong, D.-K. Yang, M. J. graham, Y. Tu, S.W. Kuo, B. S. Knapp, F. W. Harris and S. Z. D. Cheng, “Construction of chiral propeller architectures from achiral molecules,” Advanced Materials, 18, 3229 (2006).

3. K.-U Jeong, A. J. Jing, B. Mansdor, M. J. Graham, D.-K. Yang, M. J. Graham, F. W. Harris and S. Z. D. Cheng, “Biaxial molecular arrangement of rod-disc molecule under electric field,” Chemical Materials, 19, 2921 (2007).

4. D.-K. Yang, Y. Yin and H. Liu, “Nematic-isotropic phase transition of binary liquid crystal mixtures,” Liquid Crystals, 34, 605 (2007).

5. D.-K. Yang, “Review of operating principle and performance of polarizer free reflective liquid-crystal displays,” J. Soc. Inf. Display 16, 117 (2008).

6. D.-K. Yang, K.-U. Jeong, S. Z. D. Cheng, “Structure of Liquid Crystal Droplets with Chiral Propeller Texture,” J. Phys. Chem. B, 112; 1358-1366 (2008).

7. F. Zhou and D.-K. Yang, “Design of transflective bistable twisted nematic LCD,” SID Intl Symp. Digest Tech. Papers, XXXVII, 825-828 (2006).

8. D.-K. Yang, F. Zhou, S. Hurley and L. Shi, “An analytical approach in designing film STN LCDs,” Conf. Rec. 26th Intl. Display Research Conference, 235-238 (2006).

9. D.-K. Yang, F. Zhou, S. Hurley and L. Shi, “An analytic approach in designing film STN LCDs,” Conference Record of International Display Research Conference, 235-238 (2006).

10. S. Hurley and D.-K. Yang, Jianru Shi and Chris Mullin, “A Systematic Optimization of Normal-White STN-LCDs,” SID Intl Symp. Digest Tech. Papers, XXXVIII, 475-478 (2007).

11. Y.-C. Yang and D.-K. Yang, “Achromatic reduction of off axis light leakage in LCDs by self-compensated phase retardation (SPR) film,” SID Intl Symp. Digest Tech. Papers, XXXIX, 1955-1958 (2008).

12. S. Hicks, Y.-C. Yang and D.-K. Yang, “Stability and performance of OCB in transflective display,” Conference Record of International Display Research Conference, 7-10 (2008).

13. S. Hurley, Y-C. Yang and D.-K. Yang, J. Shi and C. Mullin, “Driving dynamics of VA-LCDS with small pretilt angles,” Conference Record of International Display Research Conference, 164-167 (2008).

14. Y.-C. Yang and D.-K. Yang, “Simulation study and design of biaxial nematic liquid crystal displays,” Conference Record of International Display Research Conference, 179-182 (2008).

15. Y.-C. Yang and D.-K. Yang, “Achromatic reduction of light leakage in reflective LCDs by self-compensated phase retardation (SPR) film,” Conference Record of International Display Research Conference, 249-252 (2008).

Patents

1. "Color liquid crystal display consisting of polymer dispersed chiral liquid crystal having negative dielectric anisotropy," P.P. Crooker and Dengke Yang, US. Patent 5,200,845, April 6, 1993.

2. "Method and Apparatus for Electronic Switching of a Reflective Color Display," D.K. Yang and J.W. Doane, US. Patent 5,251,048, Oct. 5, 1993.

3. "Grey Scale Liquid Crystal Materials," D.K. Yang and J.W. Doane, US. Patent 5,384,067, June 24, 1995.

4. "Liquid Crystal Light Modulating Device and Material," D.K. Yang, J.W. Doane, and L.C. Chien, US. Patent 5,437,811, Aug. 1, 1995

5. "Multistable Cholesteric Liquid Crystal Shutter," J.L. West and D.K. Yang, US Patent 5,453,863, Sept. 26, 1995.

6. "Liquid Crystal Light Modulating Device and Material," D.K. Yang, J.W. Doane, and L.C. Chien, US. Patent 5,695,682, December 12, 1997.

7. "Dynamic drive method and apparatus for bistable liquid crystal display," X.Y. Huang, D.-K. Yang and P. Bos., U.S. Patent 5,748,277, May 5, 1998.

8. "Polymer stabilized bistable black-white cholesteric reflective display," R.Q. Ma and D.-K. Yang. US. Patent 5,847,798, December 8, 1998.

9. "Bistable polymer dispersed cholesteric liquid crystal displays," D.-K. Yang, Z.-J. Lu and J.W. Doane, US. Patent 6,061,107, May 9, 2000

10. "Dual frequency switchable cholesteric polarizer and the drive waveform," D.-K. Yang and M. Xu, US. Patent 5,877,826, March 2, 1999.

11. "Drive schemes for gray scale bistable cholesteric reflective displays," Deng-Ke Yang, Xiao-Yang Huang and Nick M. Miller, US Patent 6,268,839, B1, Jul. 31, 2001.

12. "Cumulative two phase drive scheme," D.-K. Yang and Y.M. Zhu, US Patent 6,204,835 B1, March 20, 2001.

13. "Dynamic drive methods and apparatus for bistable cholesteric display," D.-K. Yang, Y.-M. Zhu and X.-Y. Huang, U. S. Patent 6,154,190, Nov. 28, 2000.

14. "Dual frequency cholesteric display and drive scheme," Ming Xu and Deng-Ke Yang, US. Patent 6,320,563 B1, November 20, 2001.

15. “Pressure sensitive liquid crystalline light modulating device and material,” J. W. Doane, D.-K. Yang and L.-C. Chien, US. Patent 6,104,448, August 15, 2000.

16. “Polymer stabilized ECB transflective liquid crystal display,” D.-K. Yang and F.S. Zhou, pending.

17. “Bistable polymer stabilized cholesteric texture switchable window,” D.-K. Yang and L. Shi, pending.

18. “Polymer stabilized isotropic liquid crystal display and phase modulator,” D-K. Yang, Y.-C. Yang and B. Rui, pending.

Recent Short course and Talks

1. April 8, 2006, New Jersey SID chapter meeting, New Jersey, “Ch reflective displays: principle, current status and future,” invited.

2. June 3, 2006, SID, San Francisco, Ca, “Design of Transflective Bistable Twisted Nematic LCD,” poster.

3. June 9, 2006, SPIE, Dayton, Oh, “Dynamics of evolution of disclinations in cholesteric liquid crystals,” Invited.

4. July 3, 2006, ILCC, Keystone, Co, “Interaction between different nematic liquid crystal molecules,” Poster.

5. July 3, 2006, ILCC, Keystone, Co, “Ideal polarization convention in liquid crystal devices by Mueller matrices and Poincaré sphere,” Poster.

6. July 3, 2006, ILCC, Keystone, Co, “Dynamics of evolution of pi-wall disclinations in cholesteric liquid crystals,” poster.

7. July 13-18, 2006, JiaoTong University, Shanghai, China, 32 hours lecture, “Liquid crystal displays”

8. September 18. 2006, Kent, Ohio, USA, International Display Research Conference workshop, “Reflective liquid crystal displays,” invited lecture.

9. September 22, 2006, Beijing, China, China Flat Panel Display annual conference, “Cholesteric reflective LCD and other reflective LCDs,” Plenary lecture.

10. May 22, 2007, Long Beach, Ca, SID, “Systematic optimization of normal white STN liquid crystal display,” Poster

11. June 13, 2007, New London, NH, Gordon conference on liquid crystals, “Simulation study of droplets with propeller texture,” poster.

12. July 10, 2007, Advanced Polymer System, Inc., Akron, OH, “Compensation films for wide viewing angle LCDs” invited.

13. October 8, 2007, Beijing University of Science and Technology, “Polymer stabilized liquid crystals,” invited

14. October, 17, 2007, Shanghai, China, Asia Optical Fiber Communications and Optoelectronics Exhibition and Conference,”Cholesteric reflective display: principle and progress,” invited.

15. October 30, 2007, XVI International Material Research Congress, Cancun, Mexico, “Polymer stabilized liquid crystals and their applications,” Invited.

16. January 7, 2008, Jackson Safety Inc. Grand Rapids, MI, “Liquid Crystal technologies for switchable goggle application”, invited.

17. February 27, 2008, Applied Materials, San Jose, Ca, “Reflective displays, liquid crystal reflective displays and cholesteric display”, invited.

18. March 12, 2008, Shanghai, China, China annual flat panel display conference, “Polymer stabilization and encapsulation in liquid crystal displays”, invited.

19. May 20, 2008, SID conference, Los Angles, Ca, “Achromatic Reduction of Off-axis Light Leakage in LCDs by Compensated Phase Retardation Film,” poster.

20. June 5, 2008, Industrial Technology Research Institute, Hsingchu, Taiwan, “Cholesteric reflective display,” 6 hours short course.

21. June 6, 2008, College of Electrical and Computer Engineering, National Chiao Tung University, Taiwan, “Polymer network in liquid crystal and their applications,” invited.

22. June 9-10, 2008, National Cheng Kung University, “Cholesteric liquid crystal and polymer stabilized cholesteric liquid crystal: optical properties and applications,” 8 hours short course.

23. June 12, 2008, Taiwan Display Conference, Taipei, Taiwan, “Flexible cholesteric reflective display,” invited talk.

24. June 25, 2008, BOE Technology Group Co. LTD, Beijing, China, “Optically compensated bend mode liquid crystal display,” invited.

25. June 27, 2008, Korea-Ukrainian-American joint symposium on New horizons of liquid crystal science and applications II, Chonbuk National University, Korea,, “Polymer networks in liquid crystals,” invited.

26. July 1, 2008, Jeju, Korean, International liquid crystal conference, “Chiral Propeller Liquid Crystal Droplets: Structure and Response to Electric Fields,” Poster.

27. July 1, 2008, Jeju, Korean, International liquid crystal conference, “Effects of Pretilt Angle and Random Noise on the Switching Dynamics of VA LCDs,” Poster.

28. August 5, 2008, Polytronix Inc, Dallas, “New Liquid displays,” Invited.

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