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:
Feb. 12, 2008
Filed:
Apr. 07, 2005
Norihisa Nakao, Tokyo, JP;
Daiki Takahashi, Miyagi, JP;
Hiroyoshi Fukasawa, Tokyo, JP;
Hidemi Matsuda, Tokyo, JP;
Norihisa Nakao, Tokyo, JP;
Daiki Takahashi, Miyagi, JP;
Hiroyoshi Fukasawa, Tokyo, JP;
Hidemi Matsuda, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An optical filter applied to a display apparatus, disposes on a substrate with transparency and has a maximum absorption wavelength λ in a wavelength range of 575±20 nm in connection with a wavelength range from 450 to 650 nm. The optical filter satisfies a relationship,0.65≦(λ)/(λ)≦0.90where T(λ) is a transmittance at a central part of the substrate at the maximum absorption wavelength λ, and T(λ) is a transmittance at a peripheral part of the substrate at the maximum absorption wavelength λ. The optical filter also satisfies a relationship,0.90≦((λ)/(λ))/((λ)/(λ))≦1.05with respect to transmittances wherein λis each wavelength 450 nm, 530 nm and 630 nm, and λ is the maximum absorption wavelength.