Liquid crystal display device

• US 8,659,718 B2
• Filed: 12/21/2011
• Issued: 02/25/2014
• Est. Priority Date: 12/24/2010
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Sato, Naoki, Sekiguchi, Yoshifumi, Iwasaki, Naoki, Kitada, Takaaki
• Primary Examiner(s): Rude, Timothy L
• Application Number:
  US13/333,442
• Publication Number:
  US 20120162569A1
• Time in Patent Office: 797 Days
• Field of Search: 349/58
• US Class Current: 349/58
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133317 Intermediate frames, e.g. between backlight housing and front frame

Abstract

Provided is a liquid crystal display device (1) with increased light use efficiency and thin frame on the side on which the light emitting diode is disposed, including: a liquid crystal panel (3); a backlight unit (5) including a light guide plate (12) and light emitting diodes being disposed side by side in a longitudinal direction of an incident surface; an intermediate frame (9), which includes a plurality of protruding portions that protrude to an exiting surface side of the light guide plate (12); and an end portion reflection sheet (14), which is disposed on an exiting surface side of the intermediate frame (9) and adjacent to the plurality of protruding portions, extends in an array direction of the light emitting diodes, and includes tongue-shaped portions each extending between adjacent ones of the plurality of protruding portions.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal panel;

a backlight unit comprising a light guide plate and light emitting diodes, the light emitting diodes being opposed to an incident surface of the light guide plate, which is at least one side surface of the light guide plate, and being disposed side by side in a longitudinal direction of the incident surface;

an intermediate frame, which comprises a plurality of protruding portions that protrude to an exiting surface side of the light guide plate, and is disposed between the liquid crystal panel and the backlight unit; and

an end portion reflection sheet, which is disposed on an exiting surface side of the intermediate frame and adjacent to the plurality of protruding portions, extends in an array direction of the light emitting diodes, and comprises tongue-shaped portions each extending between adjacent ones of the plurality of protruding portions.

2. The liquid crystal display device according to claim 1, wherein the plurality of protruding portions are arrayed intermittently along the array direction of the light emitting diodes, and are provided on a light incident direction side of the incident surface with respect to the incident surface of the light guide plate.

3. The liquid crystal display device according to claim 1, further comprising shielding portions for shielding light, each of which is disposed between the adjacent ones of the plurality of protruding portions in a region on a light incident direction side of the incident surface.

4. The liquid crystal display device according to claim 1, wherein the intermediate frame further comprises second protruding portions, which are adapted to contact the light guide plate at positions corresponding to four corners of the light guide plate, the second protruding portions being larger in size than the plurality of protruding portions.

5. The liquid crystal display device according to claim 1, wherein the end portion reflection sheet further comprises a portion extending out of the intermediate frame in a direction opposite to a light incident direction of the incident surface.