Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9377652-B2
Application number	US-201314035612-A
Country	US
Kind code	B2
Filing date	Sep 24, 2013
Priority date	Sep 26, 2012
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A liquid crystal display device includes a liquid crystal panel; a backlight unit disposed under the liquid crystal panel and including a light guide plate and a light emitting diode (LED) assembly at a side of the light guide plate; a main frame surrounding a side of the backlight unit and having a light-diffusion property.

First claim

What is claimed is:

1. A liquid crystal display device, comprising:
a liquid crystal panel;
a backlight unit disposed under the liquid crystal panel and including a light guide plate, the light guide plate in a plane, and a light emitting diode (LED) assembly at a side of the light guide plate; and
a main frame surrounding a side of the backlight unit and having a light-diffusion property, the main frame comprising:
a first portion perpendicular to the liquid crystal panel; and
a second portion connected to the first portion and disposed between the light guide plate and the liquid crystal panel, the second portion having a surface, the surface inclined toward the plane of the light guide plate;

wherein the liquid crystal panel covers an upper side of the LED assembly in plan view of the liquid crystal panel and is configured to receive light from the LED assembly that is diffused by the main frame toward the liquid crystal panel.

2. The device according to claim 1 , wherein the second portion extends from an end of the first portion.

3. The device according to claim 1 , wherein the main frame further includes a third portion horizontally extending from an end of the first portion, the third portion connecting the first portion and the second portion and parallel to the plane of the light guide plate.

4. The device according to claim 1 , wherein the first portion includes a first vertical portion corresponding to the backlight unit and a second vertical portion corresponding to a side of the liquid crystal panel.

5. The device according to claim 4 , further comprising an optical sheet between the liquid crystal panel and the light guide plate, and a side of the optical sheet is surrounded by the second vertical portion.

6. The device according to claim 2 , wherein a diffusion pattern is formed at a bottom surface of the second portion.

7. The device according to claim 1 , wherein a plane area of the liquid crystal panel is equal to a plane area of an outer dimension of the main frame.

8. The device according to claim 1 , further comprising a bottom frame including a bottom surface covering a bottom of the backlight unit and four side surfaces extending from the bottom surface.

9. The device according to claim 8 , wherein the LED assembly is attached to one of the four side surfaces of the bottom frame, and the main frame is combined with the bottom frame from an outer side direction.

10. The device according to claim 8 , wherein the LED assembly is attached to the main frame, and the four side surfaces of the bottom frame are combined with the main frame from an outer side direction.

11. The device according to claim 1 , further comprising an optical sheet between the liquid crystal panel and the light guide plate.

12. The device according to claim 11 , wherein the optical sheet is fixed on the main frame in a point adhesion using an optically clear adhesive.

13. The device according to claim 12 , wherein a first main frame rib and a second main frame rib are formed at two upper surfaces of adjacent sides of the main frame, and an aperture is formed at adjacent portions of the first and second main frame ribs, and wherein the optical sheet includes a protrusion at a corner, and the protrusion is inserted into the aperture.

14. The device according to claim 1 , wherein the surface of the second portion is inclined at an angle between the first portion and the plane of the light guide plate.

15. The device according to claim 1 , wherein the surface of the second portion is inclined at an angle less than 90 degrees with respect to the first portion.

16. A liquid crystal display (LCD) device, comprising:
a first sub-LCD device including a first liquid crystal panel, a first backlight unit disposed under the first liquid crystal panel and including a first light guide plate, the first light guide plate in a first plane, and a first light emitting diode (LED) assembly at a side of the first light guide plate, and a first main frame surrounding a side of the first backlight unit; and
a second sub-LCD device including a second liquid crystal panel, a second backlight unit disposed under the second liquid crystal panel and including a second light guide plate, the second light guide plate in a second plane, and a second LED assembly at a side of the second light guide plate and a second main frame surrounding a side of the second backlight unit,
wherein at least one of the first and second main frames includes a material having a light-diffusion property,
wherein each of the first and second main frames comprises:
a side surface;
a first upper surface connected to the side surface, the first upper surface corresponding to each of the first and second LED assemblies, the first upper surface inclined toward the planes of the first and second light guide plates; and
a second upper surface opposite to each of the first and second LED assemblies,

the first upper surface of the first main frame disposed between the first light guide plate and the first liquid crystal panel, and the first upper surface of the second main frame disposed between the second light guide plate and the second liquid crystal panel,
wherein the first liquid crystal panel covers an upper side of the first LED assembly in plan view of the first liquid crystal panel and is configured to receive light from the first LED assembly that is diffused by the first main frame toward the first liquid crystal panel, and
wherein the second liquid crystal panel covers an upper side of the second LED assembly in plan view of the second liquid crystal panel and is configured to receive light from the second LED assembly that is diffused by the second main frame toward the second liquid crystal panel.

17. The device according to claim 16 , wherein the first and second light guide plates are disposed between the first and second LED assemblies.

18. The device according to claim 16 , wherein the first light guide plate and the second LED assembly are disposed between the first LED assembly and the second light guide plate.

19. The device according to claim 16 , wherein each of the first and second backlight units further includes a reflective polarization film between the first LED assembly and the first light guide plate and between the second LED assembly and the second light guide plate.

20. The device according to claim 16 , wherein the second upper surface has an inclined shape with respect to the side surface, a vertical shape with respect to the side surface or a curvature shape in a cross-section.

Assignees

• Lg Display Co Ltd

Inventors

• Choi Eun-Hee
• Park Jin-Seo

Classifications

• G02F1/13336

  Combining plural substrates to produce large-area displays, e.g. tiled displays · CPC title

• G02F2001/133317

  Physics · mapped topic

• G02F1/133615

  Edge-illuminating devices, i.e. illuminating from the side · CPC title

• G02F1/133606 Primary

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02F1/133317

  Intermediate frames, e.g. between backlight housing and front frame · CPC title