Title

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

Authors

Authors

J. H. Lee; X. Y. Zhu; Y. H. Lin; W. K. Choi; T. C. Lin; S. C. Hsu; H. Y. Lin;S. T. Wu

Comments

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Abbreviated Journal Title

Opt. Express

Keywords

DIODES; Optics

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 degrees 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. (c) 2005 Optical Society of America.

Journal Title

Optics Express

Volume

13

Issue/Number

23

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

9431

Last Page

9438

WOS Identifier

WOS:000233334900034

ISSN

1094-4087

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