Open AccessExtraordinarily wide-view and wide spectral bandwidth transflective liquid-crystal displays
Author(s) -
ChiHuang Lin,
Ru-Hsien Chiang,
Ming-Li He,
Chia-Wei Chen
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.004601
Subject(s) - polarizer , viewing angle , optics , liquid crystal display , materials science , broadband , liquid crystal , contrast ratio , bandwidth (computing) , compensation (psychology) , optoelectronics , physics , computer science , birefringence , telecommunications , psychology , psychoanalysis
This work presents a simple compensation method for widening the viewing angle of transflective liquid-crystal displays (TR-LCDs). For an off-axis light, the slow axis of a biaxial film shifts linearly as the Nz factor is varied. By using this optical characteristic of a biaxial film, the broadband condition of broadband circular polarizers exactly holds over a full 80 degrees viewing cone, thus eliminating the off-axis light leakage to widen the viewing angle of TR-LCDs. Based on the proposed compensation method, the TR-LCDs theoretically have a wide spectral bandwidth and a viewing angle of 80 degrees for contrast-ratio (CR) >100:1 and >30:1 in transmissive and reflective modes, respectively. Experiments also show that the proposed TR-LCD has a viewing angle of over the entire 80 degrees and 65 degrees viewing cone in T-mode and R-mode, respectively, for CR>10:1. The proposed TR-LCD is highly promising for mobile display applications.