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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 8 — Apr. 22, 2013
  • pp: 10358–10366

Actively transparent display with enhanced legibility based on an organic light-emitting diode and a cholesteric liquid crystal blind panel

Jeongho Yeon, Tae-Wook Koh, Hyunsu Cho, Jin Chung, Seunghyup Yoo, and Jun-Bo Yoon  »View Author Affiliations

Optics Express, Vol. 21, Issue 8, pp. 10358-10366 (2013)

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Transparent display is one of the most promising concepts among the next generation information display devices. Nevertheless, conventional transparent displays have two inherent problems: low forward light efficiency due to the light being emitted also in a backward direction; and low legibility due to the visual interruption caused by the light coming from the background. In this work, a cholesteric liquid crystal (Ch-LC) based, actively operational blind panel is combined with transparent organic light-emitting diodes (TR-OLEDs) to recycle the light wasted by backward propagation in transparent displays while blocking the light from behind the display, pursuing both improved forward light efficiency and enhanced image legibility. By tuning the reflectance spectrum of the Ch-LC panel to match the emission spectrum of TR-OLEDs, we achieved luminous efficiency increase by as large as 21% (85%) when the top metal cathode side (the bottom ITO side) of the OLEDs fa'transparent OLED' ces the blind panel. Maximum transmittance of the proposed device reached a high value of 60%, successfully demonstrating a new window-like transparent display concept.

© 2013 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Optical Devices

Original Manuscript: March 1, 2013
Revised Manuscript: April 8, 2013
Manuscript Accepted: April 9, 2013
Published: April 19, 2013

Jeongho Yeon, Tae-Wook Koh, Hyunsu Cho, Jin Chung, Seunghyup Yoo, and Jun-Bo Yoon, "Actively transparent display with enhanced legibility based on an organic light-emitting diode and a cholesteric liquid crystal blind panel," Opt. Express 21, 10358-10366 (2013)

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  1. S. I. Park, Y. Xiong, R. H. Kim, P. Elvikis, M. Meitl, D. H. Kim, J. Wu, J. Yoon, C. J. Yu, Z. Liu, Y. Huang, K. C. Hwang, P. Ferreira, X. Li, K. Choquette, and J. A. Rogers, “Printed assemblies of inorganic light-emitting diodes for deformable and semitransparent displays,” Science325(5943), 977–981 (2009). [CrossRef] [PubMed]
  2. M. Antikainen, J. Haaranen, J. Honkala, M. Lahonen, V.-M. Liias, A. Pakkala, T. Pikänen, E. Soininen, and R. Törnqvist, “Transparent emissive thin-film electroluminescent display,” SID Symposium Digest of Technical Papers31, 885–887 (2000). [CrossRef]
  3. W.-S. Song, Y.-S. Kim, and H. Yang, “Construction of highly transparent plasma display devices using hydrothermally synthesized green-emitting LaPO4:Ce, Tb nanophosphors,” J. Electrochem. Soc.158(5), J137–J142 (2011). [CrossRef]
  4. S.-M. Lee, S. H. Oh, and K. C. Choi, “Highly transparent SU-8 photoresist barrier rib for a transparent AC plasma display panel,” J. Display Technol.7(1), 40–43 (2011). [CrossRef]
  5. S. M. Lee, D. Kim, D. Y. Jeon, and K. C. Choi, “Nanoplasmon-enhanced transparent plasma display devices,” Small8(9), 1350–1354 (2012). [CrossRef] [PubMed]
  6. C.-Y. Lo, O.-H. Huttunen, J. H. Keinänen, J. Petäjä, H. Fujita, and H. Toshiyoshi, “MEMS-controlled paper-like transmissive flexible display,” J. Microelectromech. Syst.19(2), 410–418 (2010). [CrossRef]
  7. J. Heikenfeld and A. J. Steckl, “High-transmission electrowetting light valves,” Appl. Phys. Lett.86(15), 151121 (2005). [CrossRef]
  8. G. Gu, V. Bulovic, P. E. Burrows, S. R. Forrest, and M. E. Thompson, “Transparent organic light emitting devices,” Appl. Phys. Lett.68(19), 2606–2608 (1996). [CrossRef]
  9. G. Parthasarathy, P. E. Burrows, V. Khalfin, V. G. Kozlov, and S. R. Forrest, “A metal-free cathode for organic semiconductor devices,” Appl. Phys. Lett.72(17), 2138–2140 (1998). [CrossRef]
  10. B. J. Chen, X. W. Sun, and S. C. Tan, “Transparent organic light-emitting devices with LiF/Mg:Ag cathode,” Opt. Express13(3), 937–941 (2005). [CrossRef] [PubMed]
  11. H. Cho, J. M. Choi, and S. Yoo, “Highly transparent organic light-emitting diodes with a metallic top electrode: the dual role of a Cs2CO3 layer,” Opt. Express19(2), 1113–1121 (2011). [CrossRef] [PubMed]
  12. J. Lee, S. Hofmann, M. Furno, M. Thomschke, Y. H. Kim, B. Lüssem, and K. Leo, “Influence of organic capping layers on the performance of transparent organic light-emitting diodes,” Opt. Lett.36(8), 1443–1445 (2011). [CrossRef] [PubMed]
  13. J. W. Huh, J. Moon, J. W. Lee, D.-H. Cho, J.-W. Shin, J.-H. Han, J. Hwang, C. W. Joo, H. Y. Chu, and J.-I. Lee, “Directed emissive high efficient white transparent organic light emitting diodes with double layered capping layers,” Org. Electron.13(8), 1386–1391 (2012). [CrossRef]
  14. W. Kowalsky, P. Görrn, J. Meyer, M. Kröger, H.-H. Johannes, and T. Riedl, “See-through OLED displays,” Proc. SPIE6486, 64860F, 64860F-14 (2007). [CrossRef]
  15. J.-H. Lee, X. Zhu, Y.-H. Lin, W. K. Choi, T.-C. Lin, S.-C. Hsu, H.-Y. Lin, and S.-T. Wu, “High ambient-contrast-ratio display using tandem reflective liquid crystal display and organic light-emitting device,” Opt. Express13(23), 9431–9438 (2005). [CrossRef] [PubMed]
  16. J.-H. Lee, H. Xianyu, Z. Ge, X. Zhu, Y.-H. Lu, C.-W. Teng, K.-C. Liu, and S.-T. Wu, “Hybrid transflective displays using vertically integrated transparent OLED and reflective LCD,” SID Symposium Digest of Technical Papers38, 1810–1812 (2007). [CrossRef]
  17. C.-C. Wu, C.-F. Lin, J.-H. Lee, W.-F. Chang, T.-L. Chiu, and S.-W. Liu, “Fully integration of transflective hybrid device consisting of PSCT and In-cell OLED,” SID Symposium Digest of Technical Papers42, 1602–1605 (2011). [CrossRef]
  18. P. Yeh and C. Gu, Optics of Liquid Crystal Displays (Wiley, 1999).
  19. N. Y. Ha, Y. Ohtsuka, S. M. Jeong, S. Nishimura, G. Suzaki, Y. Takanishi, K. Ishikawa, and H. Takezoe, “Fabrication of a simultaneous red-green-blue reflector using single-pitched cholesteric liquid crystals,” Nat. Mater.7(1), 43–47 (2008). [CrossRef] [PubMed]
  20. M. Mitov and N. Dessaud, “Going beyond the reflectance limit of cholesteric liquid crystals,” Nat. Mater.5(5), 361–364 (2006). [CrossRef] [PubMed]
  21. A. C. Tasolamprou, M. Motov, D. C. Zografopoulos, and E. E. Kriezis, “Theoretical and experimental studies of hyperreflective polymer-network cholesteric liquid crystal structures with helicity inversion,” Opt. Commun.282(5), 903–907 (2009). [CrossRef]
  22. R. A. M. Hikmet and H. Kemperman, “Electrically switchable mirrors and optical components made from liquid-crystal gels,” Nature392(6675), 476–479 (1998). [CrossRef]
  23. S. Relaix, C. Bourgerette, and M. Mitov, “Broadband reflective liquid crystalline gels due to the ultraviolet light screening made by the liquid crystal,” Appl. Phys. Lett.89(25), 251907 (2006). [CrossRef]
  24. M. E. McConney, V. P. Tondiglia, J. M. Hurtubise, T. J. White, and T. J. Bunning, “Photoinduced hyper-reflective cholesteric liquid crystals enabled via surface initiated photopolymerization,” Chem. Commun. (Camb.)47(1), 505–507 (2011). [CrossRef] [PubMed]

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