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, Shin Tson Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)9431-9438
Number of pages8
JournalOptics Express
Volume13
Issue number23
DOIs
StatePublished - 14 Nov 2005

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