ILLUMINATION DEVICE, DISPLAY DEVICE, AND TELEVISION RECEIVING DEVICE

• US 20140320747A1
• Filed: 09/28/2012
• Published: 10/30/2014
• Est. Priority Date: 10/06/2011
• 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: Kamada, Kentaro
• Granted Patent: US 9,116,275 B2
• Time in Patent Office: Days
• US Class Current: 348/725
• CPC Class Codes: G02B 6/0013 Means for improving the coupling-in of light from the light source into the light guide coupling light into light guides in general G02B6/42
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package

Abstract

The backlight device (24) is provided with a bottom plate (22a), a light-guide plate (20) that has a light-receiving face (20a) on a side face and that is arranged such that the back surface of the plate is oriented to face the front of the bottom plate (22a), an LED light-source (28) that is arranged opposite to the light-receiving face (20a) on the front surface of the bottom plate (22a), a reflective sheet (26) that is arranged to be in contact with the bottom surface of the light guide plate (20), a protruding member (38) that is formed so as to protrude from the front surface of the bottom plate (22a) and that has, as top surfaces, a first surface (38a) provided so as to contact the surface of the reflective sheet (26) on the side opposite of the bottom plate and a second surface (38b) that is separated from the first surface (38a) by a step (38c) and that, between the light-receiving face (20a) and the LED light source (28), is higher than the back surface of the light guide plate (20).

Claims

1. An illumination device, comprising:

a plate member;

a light guide plate having a side face acting as a light-receiving face, the light guide plate being disposed such that a surface thereof faces a surface of the plate member;

a light source disposed above said surface of the plate member so as to face the light-receiving face;

a reflective sheet disposed on said surface of the light guide plate; and

a protruding member protruding from said surface of the plate member, the protruding member having a first surface and a second surface as two top surfaces, the first surface being disposed so as to contact a surface of the reflective sheet that faces the plate member, the second surface being disposed at a level higher than the first surface and said surface of the light guide plate and between the light-receiving face and the light source.

2. The illumination device according to claim 1,

wherein the reflective sheet has a first folded section in an edge portion that is adjacent to the light source, the first folded section being folded so as to extend along a face that connects the first surface and the second surface.

3. The illumination device according to claim 2,

wherein the reflective sheet has a second folded section that is folded toward the light source from an edge of the first folded section along the second surface.

4. The illumination device according to claim 1,

wherein a face that connects the first surface and the second surface is in contact with the light-receiving face.

5. The illumination device according to claim 1,

wherein the second surface of the protruding member is formed to be lower than an edge of the light source that faces the plate member in a cross-sectional view.

6. The illumination device according to claim 1,

wherein the protruding member is integrally formed with the plate member.

7. The illumination device according to claim 1, further comprising a buffer member interposed between the reflective sheet and the plate member,

wherein the buffer member is made of PORON.

8. The illumination device according to claim 1,

wherein the plate member has a wall portion that rises on a side of the plate member facing the light source,

wherein the illumination device further comprises a light source substrate having the light source provided on a surface thereof,

wherein the light source substrate is attached to the wall portion, and

wherein a heat-dissipating property of the plate member is higher than a heat-dissipating property of the light source substrate.

9. The illumination device according to claim 1, further comprising a chassis that houses the light guide plate, the light source, and the reflective sheet,

wherein the plate member is a part of the chassis.

10. The illumination device according to claim 1, further comprising:

a heat-dissipating member having the plate member as a part thereof and having a heat-dissipating property; and

a chassis that houses the light guide plate, the light source, the reflective sheet, and the heat-dissipating member.

11. A display device, comprising a display panel that displays images using light from the illumination device according to claim 1.

12. The display device according to claim 11, wherein the display panel is a liquid crystal panel that uses liquid crystal.

13. A television receiver, comprising the display device according to claim 11.