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67.1: Invited Paper : Hybrid Transflective Displays using Vertically Integrated Transparent OLED and Reflective LCD
Author(s) -
Lee JiunHaw,
Xianyu Haiqing,
Ge Zhibing,
Zhu Xinyu,
Lu YenHsun,
Teng ChaoWen,
Liu KouChen,
Wu ShinTson
Publication year - 2007
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.2785686
Subject(s) - oled , liquid crystal display , transmittance , materials science , optoelectronics , high contrast , optics , contrast ratio , layer (electronics) , physics , nanotechnology
We demonstrate a hybrid device by vertically integrating a reflective LCD and a transparent OLED. The vertical alignment (VA) LC cell operated at normally black (NB) mode is placed beneath the transparent OLED to improve device transmittance. Under dark ambient, OLED is the primary display but the NB‐RLCD absorbs the incoming light which in turn increases the ambient contrast ratio (A‐CR). However, it also absorbs the photons from the OLED emission and decreases the efficiency. In our hybrid device, by placing the transparent OLED on top of the reflective LCD, the transmittance of the hybrid device is enhanced by 57.3% due to the asymmetric emission intensities from both sides of the transparent OLED. Under bright ambient conditions, the OLED could be washed out but the RLCD is activated. Hence, the tandem display exhibits a high contrast ratio (>105:1) under any ambient light conditions.