Liquid crystal display device

• US 9,104,065 B2
• Filed: 11/29/2011
• Issued: 08/11/2015
• Est. Priority Date: 12/02/2010
• 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: Baba, Masashi
• Primary Examiner(s): NGUYEN, DUNG T
• Application Number:
  US13/306,497
• Publication Number:
  US 20120140146A1
• Time in Patent Office: 1,351 Days
• Field of Search: 349 61- 69
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means

Abstract

Provided is a liquid crystal display device (1), including: a liquid crystal panel (2); and a backlight unit (4), which is disposed on a rear surface of the liquid crystal panel (2) and includes a light source substrate (42) onto which a plurality of light sources are mounted and a casing (49), in which: the plurality of light sources are arranged along one direction, and at least one of the plurality of light sources is disposed so as to be offset in a direction orthogonal to the one direction with respect to at least another one of the plurality of light sources; and the backlight unit further includes a fixture (50) for fixing the light source substrate (42) onto the casing (49), the fixture being disposed on a side of the offset light source in an opposite direction to an offset direction.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal panel having a rectangular shape, a length of the liquid crystal panel in a longitudinal direction being larger than a width of the liquid crystal panel in a width direction orthogonal to the longitudinal direction; and

a backlight unit, which is disposed on a rear surface of the liquid crystal panel and comprises a light source substrate onto which a plurality of light sources are mounted, a reflection sheet, and a casing, wherein;

the plurality of light sources are arranged along the longitudinal direction of the liquid crystal panel, and at least one of the plurality of light sources is disposed at a first position so as to be offset in the width direction with respect to at least another one of the plurality of light sources disposed at a second position,

the backlight unit further comprises a lens disposed in front of a light source element of each of the plurality of light sources,

a dimension of the lens in the width direction of the liquid crystal panel is larger than a dimension of the lens in the longitudinal direction of the liquid crystal panel; and

a part of the lens corresponding to the light source disposed at the first position overlaps with a part of the lens corresponding to the light source disposed at the second position in the width direction of the liquid crystal panel,

the backlight unit further comprises a fixture for fixing the light source substrate onto the casing, the fixture being disposed on a side of the offset light source in an opposite direction to an offset direction,

the liquid crystal panel has a first region facing the light source substrate at a central portion in the width direction of the liquid crystal panel and second regions provided on both sides of the first region in the width direction of the liquid crystal panel facing the reflection sheet.

2. The liquid crystal display device according to claim 1, wherein the plurality of light sources and the fixture are disposed at positions overlapping one another in the longitudinal direction.

3. The liquid crystal display device according to claim 1, wherein

the lens has a shape asymmetric in the width direction about an optical axis direction of the light source element.

4. The liquid crystal display device according to claim 1, wherein the plurality of light sources are arranged in two rows in the longitudinal direction so as to be disposed alternately in the width direction.

5. The liquid crystal display device according to claim 1, wherein the plurality of light sources are arranged in three rows in the longitudinal direction so as to be disposed in a wavelike fashion in the width direction.

6. The liquid crystal display device according to claim 1, wherein the plurality of light sources are arranged in the longitudinal direction so as to be offset in the width direction irregularly.

12. The liquid crystal display device according to claim 1, wherein the fixture extends through the light source substrate at a position spaced from the offset light source in the width direction.

7. A liquid crystal display device, comprising:

a liquid crystal panel having a rectangular shape, and a length of the liquid crystal panel in a longitudinal direction being larger than a width of the liquid crystal panel in a width direction orthogonal to the longitudinal direction; and

a backlight unit, which is disposed on a rear surface of the liquid crystal panel and comprises a light source substrate onto which a plurality of light sources are mounted, a reflection sheet, and a casing, wherein;

the plurality of light sources are arranged along the longitudinal direction of the liquid crystal panel, and at least one of the plurality of light sources is disposed at a first position so as to be offset in the width direction with respect to at least another one of the plurality of light sources disposed at a second position,

the backlight unit further comprises a lens disposed in front of a light source element of each of the plurality of light sources,

a dimension of the lens in the width direction of the liquid crystal panel is larger than a dimension of the lens in the longitudinal direction of the liquid crystal panel, and

a part of the lens corresponding to the light source disposed at the first position overlaps with a part of the lens corresponding to the light source disposed at the second position in the width direction of the liquid crystal panel,

the backlight unit further includes a fixture for fixing the light source substrate and a fixing plate to each other, the fixture being disposed outside the light source substrate in a plan view,

the liquid crystal panel has a first region facing the light source substrate at a central portion in the width direction of the liquid crystal panel and second regions provided on both sides of the first region in the width direction of the liquid crystal panel facing the reflection sheet.

8. The liquid crystal display device according to claim 7, wherein

the lens has a shape asymmetric in the width direction about an optical axis direction of the light source element.

9. The liquid crystal display device according to claim 7, wherein the plurality of light sources are arranged in two rows in the longitudinal direction so as to be disposed alternately in the width direction.

10. The liquid crystal display device according to claim 7, wherein the plurality of light sources are arranged in three rows in the longitudinal direction so as to be disposed in a wavelike fashion in the width direction.

11. The liquid crystal display device according to claim 7, wherein the plurality of light sources are arranged in the longitudinal direction so as to be offset in the width direction irregularly.