Backlight Device and Liquid Crystal Display

• US 20070253218A1
• Filed: 06/22/2005
• Published: 11/01/2007
• Est. Priority Date: 09/10/2004
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Tanabe, Takayoshi
• Granted Patent: US 7,553,060 B2
• Time in Patent Office: Days
• US Class Current: 362/612
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources

Abstract

A backlight apparatus of a sidelight type includes a light guide plate having an incident face on a lateral face and a light source unit having a plurality of substrates. The plurality of the substrates are respectively disposed on the incident face side of the light guide plate such that each of substrate faces of the substrates is parallel with a light exit face of the light guide plate, and the substrates are adjacent to one another in a thickness direction of the light guide plate. A plurality of light emitting devices that emit light along the substrate faces are mounted in columns on each of the substrate faces of the plurality of the substrates such that emitting directions of the light emitting devices are directed to the incident face.

Claims

1. A backlight apparatus of a sidelight type comprising:

a light guide plate having an incident face on a lateral face; and

a light source unit having a plurality of substrates, wherein

the plurality of the substrates are respectively disposed on the incident face side of the light guide plate such that each of substrate faces of the substrates is parallel with a main face of the light guide plate, and the substrates are adjacent to one another in a thickness direction of the light guide plate, and

a plurality of light emitting devices are mounted in columns on each of the substrate faces of the plurality of the substrates such that emitting directions of the light emitting devices are directed to the incident face.

2. The backlight apparatus according to claim 1, wherein a heat sink plate is disposed between each of the plurality of the substrates and another substrate that is adjacent to the substrate.

3. The backlight apparatus according to claim 1, wherein

adjacent two substrates among the plurality of the substrates are disposed such that mounting faces of the two substrates face each other, and

a plurality of light emitting devices that are mounted on one of the two substrates and a plurality of light emitting devices that are mounted on other one of the two substrates are mounted in positions that are not overlapped with each other in the thickness direction of the light guide plate.

6. The backlight apparatus according to claim 1, wherein an end portion of the light guide plate on the incident face side has a portion that is formed such that a thickness of the portion is gradually increased as is closer to the incident face.

7. The backlight apparatus according to claim 1, wherein the plurality of the light emitting devices are light emitting diodes that emit light along the substrate face.

8. The backlight apparatus according to claim 7, wherein the plurality of the light emitting devices are white color light emitting diodes.

9. The backlight apparatus according to claim 7, wherein the plurality of the light emitting devices include a red color light emitting diode, a green color light emitting diode and a blue color light emitting diode.

10. A liquid crystal display comprising the backlight apparatus according to claim 1.

4. A backlight apparatus of a sidelight type comprising:

a light guide plate having an incident face on a lateral face; and

a light source unit having a flexible substrate, wherein

the flexible substrate comprises a plurality of mounting regions, and is folded at a part except for the mounting regions such that mounting faces of the plurality of the mounting regions are parallel with a main face of the light guide plate, and

a plurality of light emitting devices are mounted in columns on each of the mounting faces of the plurality of the mounting regions such that emitting directions of the light emitting devices are directed to the incident face.

5. The backlight apparatus according to claim 4, wherein

the flexible substrate is folded such that mounting faces of at least two mounting regions among the plurality of the mounting regions face one another, and

a light emitting device that is mounted on one of the mounting regions and a light emitting device that is mounted on other one of the mounting regions are mounted in positions that are not overlapped with one another in a thickness direction of the light guide plate.