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Optics Express

Optics Express

  • Editor: Micha
  • Vol. 13, Iss. 23 — Nov. 14, 2005
  • pp: 9431–9438

High ambient-contrast-ratio display using tandem reflective liquid crystal display and organic light-emitting device

Jiun-Haw Lee, Xinyu Zhu, Yi-Hsin Lin, Wing Kit Choi, Tien-Chun Lin, Sheng-Chih Hsu, Hoang-Yan Lin, and Shin-Tson Wu  »View Author Affiliations

Optics Express, Vol. 13, Issue 23, pp. 9431-9438 (2005)

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A high ambient-contrast-ratio (A-CR) and large aperture-ratio display is conceptually demonstrated and experimentally validated by stacking a normally black reflective liquid crystal display (NB-RLCD) and an organic light-emitting device (OLED). Such a tandem device can be switched between the NB-RLCD mode and the OLED mode under bright and dark ambient light, respectively. The normally black characteristic of the RLCD also helps to boost the A-CR under OLED-mode operation. To obtain a better image quality in the RLCD mode, a bumpy and transmissive structure is used to eliminate the specular reflection and to increase the viewing angle performance that results in CR>2:1 over 55° viewing cone. Besides, such a structure can also increase the external quantum efficiency of the OLED by 49.4%. In our experiments, regardless of the ambient intensity the A-CR is kept higher than 100:1.

© 2005 Optical Society of America

OCIS Codes
(230.3720) Optical devices : Liquid-crystal devices
(250.2080) Optoelectronics : Polymer active devices

ToC Category:
Research Papers

Original Manuscript: September 16, 2005
Revised Manuscript: November 2, 2005
Published: November 14, 2005

Jiun-Haw Lee, Xinyu Zhu, Yi-Hsin Lin, Wing Choi, Tien-Chun Lin, Sheng-Chih Hsu, Hoang-Yan Lin, and Shin-Tson Wu, "High ambient-contrast-ratio display using tandem reflective liquid crystal display and organic light-emitting device," Opt. Express 13, 9431-9438 (2005)

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