Illumination device and display device

• US 10,642,098 B2
• Filed: 07/08/2019
• Issued: 05/05/2020
• Est. Priority Date: 07/11/2018
• 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: Kyoukane, Youzou, Watanabe, Hisashi, Yasunaga, Hirotoshi
• Primary Examiner(s): Han, Jason M
• Application Number:
  US16/504,824
• Publication Number:
  US 20200019017A1
• Time in Patent Office: 302 Days
• Field of Search: 362 971- 974, 362612, 362623-626, 362630-634
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

[Object] To provide an illumination device that enables uniform illumination by preventing an air layer from intervening between an adhesive layer and a substrate through manual bonding of a reflection sheet, and a display device including the illumination device.

[Solution] An illumination device includes a substrate including a wiring pattern, a plurality of light sources connected to the wiring pattern, an adhesive layer disposed on the substrate, and a reflection sheet bonded to the substrate with the adhesive layer interposed therebetween. The reflection sheet includes openings corresponding to the plurality of light sources. In a first direction, the reflection sheet is located between the substrate and light-emitting surfaces of the light sources. The substrate has an air vent in an area in which the wiring pattern is not disposed and the adhesive layer is disposed.

Claims

1. An illumination device, comprising:

a substrate including a wiring pattern;

a plurality of light sources connected to the wiring pattern;

an adhesive layer disposed on the substrate; and

a reflection sheet bonded to the substrate with the adhesive layer interposed therebetween,

wherein the reflection sheet includes openings corresponding to the plurality of light sources,

wherein, in a first direction, the reflection sheet is located between the substrate and light-emitting surfaces of the light sources, and

wherein the substrate has an air vent in an area in which the wiring pattern is not disposed and the adhesive layer is disposed.

2. The illumination device according to claim 1, wherein the adhesive layer is disposed over an entirety of the reflection sheet.

3. The illumination device according to claim 1, wherein the adhesive layer extends in a stripe form in a longitudinal direction of the reflection sheet.

4. The illumination device according to claim 1, wherein the air vent is disposed on a straight line located to bisect a distance between adjacent two of the plurality of light sources in a longitudinal direction of the reflection sheet.

5. The illumination device according to claim 1, wherein a heat dissipation system is disposed on a surface of the substrate opposite to a surface on which the reflection sheet is laminated.

6. The illumination device according to claim 5, wherein the heat dissipation system includes a dissipator sheet.

7. The illumination device according to claim 5,

wherein the heat dissipation system includes a heat sink, and

wherein the heat sink includes a body and a radiator fin.

8. The illumination device according to claim 5, wherein at least one of corners of each of the light sources is in contact with a corresponding one of the openings in the reflection sheet.

9. A display device, comprising:

the illumination device according to claim 1; and

a display.