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:
Mar. 15, 2016
Filed:
May. 27, 2009
Noboru Kunimatsu, Chiba, JP;
Chikae Matsui, Mobara, JP;
Shigeru Matsuyama, Mobara, JP;
Masaki Matsumori, Tokai, JP;
Yasushi Tomioka, Hitachinaka, JP;
Katsumi Kondo, Mito, JP;
Noboru Kunimatsu, Chiba, JP;
Chikae Matsui, Mobara, JP;
Shigeru Matsuyama, Mobara, JP;
Masaki Matsumori, Tokai, JP;
Yasushi Tomioka, Hitachinaka, JP;
Katsumi Kondo, Mito, JP;
Japan Display Inc., Tokyo, JP;
Panasonic Liquid Crystal Display Co., Ltd., Himeji-shi, JP;
Abstract
An image retention phenomenon and black unevenness generated after long-time operation in the liquid crystal device are prevented. By using a material having a polyamide acid ester as a precursor less likely to adsorb impurities on a boundary for an alignment film and a material having a dielectric constant anisotropy Δ∈ of 5 or less for liquid crystals, adsorption of an antioxidant dispersed in the liquid crystals is suppressed to prevent oxidation of the liquid crystals. The extent that impurities are intruded into the liquid crystals is reduced by restricting the dielectric constant anisotropy Δ∈ of the liquid crystals to 5 or less, thereby capable of preventing the image retention phenomenon and the black unevenness.