BACK LIGHT DEVICE, LIQUID CRYSTAL DISPLAY APPARATUS AND IMAGE DISPLAY APPARATUS USING THE SAME

• US 20100066943A1
• Filed: 08/17/2009
• Published: 03/18/2010
• Est. Priority Date: 09/12/2008
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi Consumer Electronics Company Limited (Hitachi, Ltd.)
• Inventors: Aono, Yoshinori, AKIBA, Yutaka, Uemura, Norihiro, Konno, Akitoyo, Nakamura, Kiyomi, Hiyama, Ikuo, Tsumura, Makoto
• Granted Patent: US 8,259,257 B2
• Time in Patent Office: Days
• US Class Current: 349/62
• 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 for emitting the light from a light source to the liquid crystal panel through a lens;

wherein the back light device includes a wiring board with the light source arranged thereon;

wherein the light source 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 second color, and a sixth LED chip for emitting the light of the first color; and

wherein the first LED chip, the second LED chip, the third LED chip, the fourth LED chip, the fifth LED chip and the sixth LED chip are arranged in such a manner as to secure the uniformity of the distribution characteristic of the light from the light source.

2. A liquid crystal display apparatus comprising:

a liquid crystal panel; and

a back light device for emitting the light from a light source to the liquid crystal panel through a lens;

wherein the back light device includes a wiring board with the light source arranged thereon;

wherein the light source 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 second color, and a sixth LED chip for emitting the light of the first color; and

wherein the first LED chip, the second LED chip, the third LED chip, the fourth LED chip, the fifth LED chip and the sixth LED chip are arranged in that order along the side surfaces of the liquid crystal panel.

3. The liquid crystal display apparatus according to claim 2,

wherein the lens is formed of a transparent resin.

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

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

wherein the fourth LED chip, the fifth LED chip and the sixth LED chip are covered by a second lens.

5. A liquid crystal display apparatus comprising:

a liquid crystal panel; and

a back light device for emitting the light from a light source to the liquid crystal panel through a lens;

wherein the back light device includes a wiring board with the light source arranged thereon;

wherein the light source 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 second color, a fifth LED chip for emitting the light of the third color, a sixth LED chip for emitting the light of the first color, a seventh LED chip for emitting the light of the third color, an eighth LED chip for emitting the light of the first color and a ninth LED chip for emitting the light of the second color;

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

wherein the fourth LED chip, the fifth LED chip and the sixth LED chip are covered by a second lens;

wherein the seventh LED chip, the eighth LED chip, and the ninth LED chip are covered by a third lens; and

wherein the first LED chip, the second LED chip, the third LED chip, the fourth LED chip, the fifth LED chip, the sixth LED chip, the seventh LED chip, the eighth LED chip and the ninth LED chip are arranged in that order along the side surfaces of the liquid crystal panel.

6. 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.

7. The liquid crystal display apparatus according to claim 6, 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.

8. An image display apparatus comprising:

a liquid crystal panel;

a back light device for emitting the light from a light source to the liquid crystal panel through a lens; and

a housing for supporting the liquid crystal panel and the back light device;

wherein the back light device includes a wiring board with the light source arranged thereon;

wherein the light source 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 second color, and a sixth LED chip for emitting the light of the first color; and

wherein the first LED chip, the second LED chip, the third LED chip, the fourth LED chip, the fifth LED chip and the sixth LED chip are arranged in that order along the side surfaces of the liquid crystal panel.

9. A back light device having a liquid crystal panel, for emitting the light from a light source to the liquid crystal panel through a lens comprising a wiring board with the light source arranged thereon;

wherein the light source 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 second color, and a sixth LED chip for emitting the light of the first color; and

wherein the first LED chip, the second LED chip, the third LED chip, the fourth LED chip, the fifth LED chip and the sixth LED chip are arranged in that order along the side surfaces of the liquid crystal panel.