Back light device, liquid crystal display apparatus and image display apparatus using the same

• US 8,259,257 B2
• Filed: 08/17/2009
• Issued: 09/04/2012
• Est. Priority Date: 09/12/2008
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi Consumer Electronics Company Limited (Hitachi, Ltd.)
• Inventors: Akiba, Yutaka, Hiyama, Ikuo, Nakamura, Kiyomi, Aono, Yoshinori, Tsumura, Makoto, Konno, Akitoyo, Uemura, Norihiro
• Primary Examiner(s): NGO, HUYEN LE
• Application Number:
  US12/542,025
• Publication Number:
  US 20100066943A1
• Time in Patent Office: 1,114 Days
• Field of Search: 349 62- 68, 349/95
• US Class Current: 349/69
• CPC Class Codes: G02B 6/003 Lens or lenticular sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: G02B 6/009 of the light source in the package G02B6/0021 takes precedence
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133612 Electrical details

Abstract

The liquid crystal display apparatus includes a liquid crystal panel and the back light device for emitting the light from a light source to the liquid crystal panel through a lens. The light source includes a first LED for emitting the light of a first color, a second LED for emitting the light of a second color, a third LED for emitting the light of a third color, a fourth LED for emitting the light of the third color, a fifth LED for emitting the light of the second color, and a sixth LED for emitting the light of the first color. The first, second, third, fourth, fifth and sixth LEDs are arranged on the wiring board in such a manner as to offset the deviation of the light distribution.

Claims

1. A liquid crystal display apparatus comprising:

a liquid crystal panel; and

a back light device having a plurality of light sources arranged in matrix to emit the light from the plurality of the light sources to the liquid crystal panel through a lens;

wherein the back light device includes a first LED chip for emitting the light of a first color, a second LED chip for emitting the light of a second color, a third LED chip for emitting the light of a third color, a fourth LED chip for emitting the light of the third color, a fifth LED chip for emitting the light of the first color, a sixth LED chip for emitting the light of the second color, a seventh LED chip for emitting the light of the third color, an eighth LED chip for emitting the light of the third color, a ninth LED chip for emitting the light of the first color, a tenth LED chip for emitting the light of the second color, an 11th LED chip for emitting the light of the third color, a 12th LED chip for emitting the light of the third color, a 13th LED chip for emitting the light of the first color, a 14th LED chip for emitting the light of the second color, a 15th LED chip for emitting the light of the third color and a 16th LED chip for emitting the light of the third color;

wherein the first LED chip, the third LED chip, the seventh LED chip and the fifth LED chip are arranged in that order on a first column in the direction along the long axis of the liquid crystal panel;

wherein the fourth LED chip, the second LED chip, the sixth LED chip and the eighth LED chip are arranged in that order on a second column in the direction along the long axis of the liquid crystal panel;

wherein the 12th LED chip, the tenth LED chip, the 14th LED chip and the 16th LED chip are arranged in that order on a third column in the direction along the long axis of the liquid crystal panel;

wherein the ninth LED chip, the 11th LED chip, the 15th LED chip and the 13th LED chip are arranged in that order on a fourth column in the direction along the long axis of the liquid crystal panel;

wherein the first LED chip, the fourth LED chip, the 12th LED chip and the ninth LED chip are arranged in that order on a first row in the direction along the short axis of the liquid crystal panel;

wherein the third LED chip, the second LED chip, the tenth LED chip and the 11th LED chip are arranged in that order on a second row in the direction along the short axis of the liquid crystal panel;

wherein the seventh LED chip, the sixth LED chip, the 14th LED chip and the 15th LED chip are arranged in that order on a third row in the direction along the short axis of the liquid crystal panel; and

wherein the fifth LED chip, the eighth LED chip, the 16th LED chip and the 13th LED chip are arranged in that order on a fourth row in the direction along the short axis of the liquid crystal panel.

2. The liquid crystal display apparatus according to claim 1, comprising a plurality of the lenses;

wherein the first LED chip, the second LED chip, the third LED chip and the fourth LED chip are covered by the first lens;

wherein the fifth LED chip, the sixth LED chip, the seventh LED chip and the eighth LED chip are covered by the second lens;

wherein the ninth LED chip, the tenth LED chip, the 11th LED chip and the 12th LED chip are covered by the third lens; and

wherein the 13th LED chip, the 14th LED chip, the 15th LED chip and the 16th LED chip are covered by the fourth lens.