Open AccessSingle cellgap transflective liquid crystal cell with high contrast and high cellgap tolerance
Author(s) -
Gak Seok Lee,
Jeong Hyun Lee,
Jae Chang Kim,
TaeHoon Yoon,
Jin Hwan Kim,
JaeSung Yu,
Hyun-Jun Choi
Publication year - 2009
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.17.001361
Subject(s) - polarizer , optics , waveplate , electric field , materials science , liquid crystal , dark state , polarization (electrochemistry) , high contrast , contrast ratio , contrast (vision) , optoelectronics , physics , birefringence , chemistry , laser , quantum mechanics
In this paper an optical configuration of a transflective liquid crystal (LC) cell driven by a horizontal electric field is proposed, which shows high contrast, high cellgap tolerance, and single gamma, simultaneously. The dark state of the reflective part is realized by a polarizer (0 degrees), a half-wave plate (15 degrees), LC layer (120 degrees), and a quarter-wave layer (-15 degrees), while a wide-band quarter-wave plate (45 degrees) and a polarizer (90 degrees) are added for the dark state of the transmissive part. Since the optic axis of the homogeneously aligned LC layer is set to be parallel to the polarization direction of the light passed through the half-wave plate, the dark state is rarely affected by the cellgap of the LC layer. Due to the different directions of the electric fields, LCs are rotated to 97.5 degrees for the bright state of the reflective part, but to 75 degrees for that of the transmissive part. With the proposed configuration, a high contrast single-gamma transflective display with high cellgap tolerance can be realized in a single-cellgap structure.