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, 2011
Filed:
Apr. 16, 2007
Saburo Watanabe, Ichinomiya, JP;
Saburo Watanabe, Ichinomiya, JP;
Hitachi Displays, Ltd., Chiba-ken, JP;
Hitachi Displays Devices, Ltd., Chiba-ken, JP;
Abstract
An object of the present invention is to improve the color reproduction capability of a liquid crystal display backlight using white LEDs. A backlight of the present invention includes: a light guide plate; a light diffusing optical waveguidedisposed adjacent the light guide plate; a plurality of white LEDsdisposed on the light diffusing optical waveguide; and single color LEDs (red LEDs)disposed on respective opposite sides of the light diffusing optical waveguide; wherein light from the white LEDspasses through the light diffusing optical waveguideand enters the light guide platethrough a side thereof, whereas light from the single color LEDsis diffused by the light diffusing optical waveguidebefore entering the light guide platethrough the same side thereof. Thus, the light diffusing optical waveguidemixes light from the white LEDsand single color LEDs, resulting in improved color reproduction capability of the backlight.