LCD with Tunable Viewing Angle by Thermal Modulation of Optical Layer

  • Gwag, Jin-Seog (Department of Physics, Yeungnam University) ;
  • Lee, You-Jin (Department of Electronics and Computer Engineering, Hanyang University) ;
  • Han, In-Young (Department of Electronics and Computer Engineering, Hanyang University) ;
  • Yu, Chang-Jae (Department of Electronics and Computer Engineering, Hanyang University) ;
  • Kim, Jae-Hoon (Department of Electronics and Computer Engineering, Hanyang University)
  • Published : 2009.03.31

Abstract

In this paper, we review the proposed liquid crystal display (LCD) with a tunable viewing angle consisting of a conventional liquid crystal display (LCD) panel and a thermally variable retardation layer (TVRL) characterized by uniformly aligned LC film with transparent indium-tin-oxide electrodes for Joule heating. In the TVRL, nematic phase is transitioned into isotropic by Joule heating. The numerical calculation showed that the intrinsic wide viewing angle was achieved at the isotropic phase of the TVRL by Joule heating, whereas the narrow viewing angle was obtained at the nematic phase of the TVRL. The simulated and experimental results of the proposed LCD show continuous and symmetrical viewing angle characteristics by tuning the retardation of TVRL using Joule heating. The structure of the viewing angle control proposed here is adoptable to all LCD modes with wide viewing angle characteristics.

Keywords

References

  1. T. Miyashita, Y. Yamaguchi, and T. Uchida, Jpn. J. Appl. Phys., 34, L177, (1995) https://doi.org/10.1143/JJAP.34.L177
  2. K. H. Kim, K. Lee, S. B Park, J. K. Song, S. N. Kim, and J. H. Souk, The 18th International Display Research Conference Asia Display '98, p. 383
  3. M. Oh-e and K. Kondo, Appl. Phys. Lett., 67, 3895, (1995) https://doi.org/10.1063/1.115309
  4. S. H. Lee, S. L. Lee, and H. Y. Kim, Appl. Phys. Lett., 73, 2881, (1998) https://doi.org/10.1063/1.122617
  5. J. S. Gwag, K.-H. Park, J. L. Lee, J. C. Kim, and T.-H. Yoon, Jpn. J. Appl. Phys., 44, 1875, (2005) https://doi.org/10.1143/JJAP.44.1875
  6. J. S. Gwag, J. Fukuda, M. Yoneya, and H. Yokoyama, Appl. Phys. Lett., 91, 073504, (2007) https://doi.org/10.1063/1.2769946
  7. J. S. Gwag, J.-H. Kim, M. Yoneya, and H. Yokoyama, Appl. Phys. Lett., 92, 153110, (2008) https://doi.org/10.1063/1.2912038
  8. J. S. Gwag, K. Shon, Y.-K. Kim, and J.-H. Kim, Opt. Exp., 16, Accepted (2008)
  9. K.-W. Chien, Y. –J. Hsu, and H.-M. Chen, SID Int, Symp. Digest Tech. Papers 37, 1425 (2006) https://doi.org/10.1889/1.2433253
  10. K. Takatoh, S. Kobayashi, S. Kimura, N. Okada, T. Kanetsuna, N. Hirama, S. Kurogi, S. Sekiguchi, and K. Uemura, SID Int, Symp. Digest Tech. Papers 37, 1340 (2006) https://doi.org/10.1889/1.2433228
  11. M. Adachi and M. Shimura, SID Int, Symp. Digest Tech. Papers 37, 705 (2006) https://doi.org/10.1889/1.2433607
  12. J.-I. Baek, Y.-H. Kwon, J. C. Kim, and T. H. Yoon, Appl. Phys. Lett. 90, 101104 (2006)
  13. E. Jeong, Y. J. Lim, J. M. Rhee, S. H. Lee, G..-D. Lee, K. H. Park. and H. C. Choi, Appl. Phys. Lett. 90, 051116 (2007) https://doi.org/10.1063/1.2435693
  14. J. S. Gwag, Y.-J. Lee, M.-E. Kim, J.-H. Kim, J. C. Kim, and T.-H. Yoon, Opt. Express 16, 2663-2668 (2008) https://doi.org/10.1364/OE.16.002663
  15. In Young Han, Jin Seog Gwag, You Jin Lee and Jae-Hoon Kim, IMID08, 348 (2008)
  16. Jin Seog Gwag, In-Young Han, Chang-Jae Yu, Hyun Chul Choi, and Jae-Hoon Kim, Opt. Express (Accepted)
  17. In Young Han, Jin Seog Gwag, You Jin Lee, Chang-Jae Yu, and Jae-Hoon Kim, Mol. Crys. Liq. Crys., (Accepted)