Premium
P‐160: Improvement of the Contrast Ratio in Twisted Nematic LCD
Author(s) -
Lee DoYoung,
Kim HeeKyung,
Lee ManKyun,
Heo SangHoon,
Song JangKun
Publication year - 2011
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 - 10.1889/1.3621211
Subject(s) - contrast ratio , liquid crystal , contrast (vision) , liquid crystal display , materials science , dopant , twist , compensation (psychology) , optics , aspect ratio (aeronautics) , high contrast , optoelectronics , doping , physics , geometry , mathematics , psychology , psychoanalysis
Mainly due to the twisted directors near surface in dark state, the decreased contrast ratio of TN mode has been observed. Here we describe the investigation of the contrast ratio of twist nematic liquid crystal display (TN‐LCD) with an optical compensation film, WV‐film, by using computational simulation and suggest new method to improve the contrast ratio significantly. Our results indicated that by optimizing the pitch of liquid crystal with chiral dopant, the contrast ratio was improved about 20%, but the reverse twisted region of the liquid crystal occurs. By adopting twisted WV‐Film, the contrast ratio was increased about 19% without the reverse twisted region.