Backlight device and liquid-crystal display device

Patent metadata

Field	Value
Publication number	US-10670919-B2
Application number	US-201715847564-A
Country	US
Kind code	B2
Filing date	Dec 19, 2017
Priority date	Jul 1, 2015
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A backlight device includes a plurality of light sources arranged in a shape of a matrix, a reflective sheet having partition walls arranged to surround each of the plurality of light sources in four directions and reflecting light emitted from the plurality of light sources, a luminance uniformity plate located above the reflective sheet and uniforming luminance of the light emitted from the plurality of light sources and light reflected by the reflective sheet, and a support member supporting the luminance uniformity plate. The reflective sheet has an opening portion in a portion, of at least one partition wall of the partition walls arranged in the four directions, which is other than four corners, and the support member has a shield portion disposed in the opening portion and shielding the opening portion.

First claim

The invention claimed is:

1. A backlight device comprising:
a plurality of light sources arranged in a shape of a matrix;
a reflective sheet having partition walls arranged to surround each of the plurality of light sources in four directions and reflecting light emitted from the plurality of light sources, a region obtained by surrounding one of the plurality of light sources in four directions with the partition walls being a light-emitting region;
a luminance uniformity plate located above the reflective sheet and uniforming luminance of the light emitted from the plurality of light sources and light reflected by the reflective sheet; and
a support member supporting the luminance uniformity plate,
wherein the reflective sheet includes an opening portion in a portion, of at least one partition wall of the partition walls arranged in the four directions, which is other than four corners, the opening portion has a hole into which the support member is inserted,
the support member includes a snap fit inserted into the hole, a first fixing portion disposed on the hole, a shield portion disposed in the opening portion, a second fixing portion, and a first support portion supporting the luminance uniformity plate,
the shield portion reduces light leaking from the light-emitting region into an adjacent light-emitting region through the opening portion, and
the second fixing portion clips the luminance uniformity plate together with the first support portion.

2. The backlight device according to claim 1 , wherein the opening portion is provided in a portion where a straight line connecting the light sources adjacent to each other intersects the partition wall.

3. The backlight device according to claim 1 , further comprising a diffuser panel provided above the luminance uniformity plate and diffusing light exiting from the luminance uniformity plate,
wherein the support member includes a second support portion supporting the diffuser panel.

4. A liquid crystal display device comprising:
a liquid crystal panel; and
the backlight device defined in claim 1 , which is located on a back side of the liquid crystal panel and has a size corresponding to the liquid crystal panel.

5. A liquid crystal display device comprising:
a liquid crystal panel; and
the backlight device defined in claim 2 , which is located on a back side of the liquid crystal panel and has a size corresponding to the liquid crystal panel.

6. A liquid crystal display device comprising:
a liquid crystal panel; and
the backlight device defined in claim 3 , which is located on a back side of the liquid crystal panel and has a size corresponding to the liquid crystal panel.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Yamano Yoshikazu
• Sasaki Hisanori
• Kumamoto Yasuhiro

Classifications

• G02F1/133605

  including specially adapted reflectors · CPC title

• F21S2/00

  Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction · CPC title

• G02F1/133603

  with LEDs · CPC title

• G02F1/133608

  including particular frames or supporting means · CPC title

• G02F1/133611 Primary

  including means for improving the brightness uniformity · CPC title