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. 14, 2012
Filed:
Apr. 01, 2009
Takayuki Ota, Oamishirasato, JP;
Takayuki Ota, Oamishirasato, JP;
Hitachi Displays, Ltd., Chiba, JP;
Panasonic Liquid Crystal Display Co., Ltd., Hyogo-ken, JP;
Abstract
A liquid crystal display device includes a liquid crystal display panel and a backlight device which supplies light to a back surface of the liquid crystal display panel. The backlight device includes a diffusion plate, a plurality of cold cathode fluorescent lamps, and a reflection plate on which light is reflected. Assuming arrangement intervals of the plurality of cold cathode fluorescent lamps in the direction from a center portion to a peripheral portion as 'a', 'b', “c”, “d”, “e”, and “f” respectively, the plurality of cold cathode fluorescent lamps is arranged to satisfy the relationship of a>b≧c≧d≧e≧f. Such a liquid crystal display device can control the brightness distribution due to the arrangement of the cold cathode fluorescent lamps within the backlight device thus obtaining a high-quality image display without generating brightness irregularities.