The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2005
Filed:
Sep. 04, 2003
Jae-jin Lyu, Kyungki-do, KR;
Hea-ri Lee, Seoul, KR;
Kyeong-hyeon Kim, Kyungki-do, KR;
Jian-min Chen, Kyungki-do, KR;
Jae-Jin Lyu, Kyungki-do, KR;
Hea-Ri Lee, Seoul, KR;
Kyeong-Hyeon Kim, Kyungki-do, KR;
Jian-Min Chen, Kyungki-do, KR;
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
Liquid crystal display devices include a vertically aligned liquid crystal cell having first and second surfaces that extend opposite each other and contain a liquid crystal material therein having negative dielectric anisotropy. First and second polarizers are attached to the first and second surfaces of the liquid crystal cell, respectively. A first a-plate compensation film and a first c-plate compensation film are provided. These films are disposed between the first surface of the liquid crystal cell and the first polarizer. The direction having a largest refractive index in the first a-plate compensation film is parallel to or perpendicular to a polarizing direction of the first polarizer. Moreover, a difference between a summation of a retardation (n−n)×dof the first a-plate compensation film, a retardation (n−n)×dof the first c-plate compensation film and a retardation of the first and the second polarizers and a retardation due to birefringence of the liquid crystal cell is equal to or less than 15% of the retardation value due to birefringence of the liquid crystal cell.