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:
Dec. 03, 2013
Filed:
May. 12, 2010
Koji Hosogi, Hiratsuka, JP;
Junichi Maruyama, Yokohama, JP;
Misa Owa, Kokubunji, JP;
Kikuo Ono, Mobara, JP;
Goki Toshima, Tachikawa, JP;
Masahiro Fukata, Fujisawa, JP;
Koji Hosogi, Hiratsuka, JP;
Junichi Maruyama, Yokohama, JP;
Misa Owa, Kokubunji, JP;
Kikuo Ono, Mobara, JP;
Goki Toshima, Tachikawa, JP;
Masahiro Fukata, Fujisawa, JP;
Hitachi Displays, Ltd., Chiba, JP;
Panasonic Liquid Crystal Display Co., Ltd., Hyogo-Ken, JP;
Abstract
A resistive element is connected in series to a cathode terminal of an LED light source at a last stage (or an anode terminal of an LED light source at a first stage) of an LED chain, and a resistance value of the resistive element is configured to be variable in resistance value in accordance with a variation of voltage drops of the LEDs connected in series so that a resistance value of a resistive element connected to an LED chain having a large voltage drop has a smaller resistance value then a resistance value of a resistive element connected to an LED chain having a small voltage drop. With this configuration, the power, which has been wasted otherwise as heat in the backlight driver IC, may be dispersed to the resistive elements.