Backlight unit for liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9535207-B2
Application number	US-201213529331-A
Country	US
Kind code	B2
Filing date	Jun 21, 2012
Priority date	Sep 15, 2011
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A backlight unit for a liquid crystal display device is provided to prevent a light guide plate or diffusion plate from deforming or displacing. The backlight unit comprises a light source; a plurality of optical sheets disposed between the light source and a liquid crystal display panel; a light guide plate disposed between the light source and the plurality of optical sheets; a cover bottom disposed below the light guide plate; and a guide holder fixed to edges of the cover bottom to hold a lower surface and sides of the light guide plate at peripheral of the light guide plate, wherein the guide holder includes a base block facing to the lower surface of the light guide plate and at least one side wall extended from the base block to be opposite to a side of the light guide plate.

First claim

What is claimed is:

1. A backlight unit for a liquid crystal display device, comprising:
a light source for irradiating light;
a plurality of optical sheets disposed between the light source and a liquid crystal display panel;
a guide panel for supporting side surfaces and a portion of a lower surface of the liquid crystal display panel to maintain a space between the liquid crystal display panel and the plurality of optical sheets;
a light guide plate disposed under the plurality of optical sheets to convert light from the light source into planar light and make the planar light proceed to the plurality of the optical sheets;
a cover bottom disposed below the light guide plate; and
a plurality of guide holders fixed to an edge of the cover bottom and spaced apart in an interval,
wherein each of the guide holders includes:
a base block disposed under the light guide plate and fixed to an inner bottom surface of the cover bottom, and
at least one side wall extended from the base block,

wherein the at least one side wall is spaced apart from the light guide plate,
wherein the base block of the guide holder supports a lower portion of the light guide plate, and the at least one side wall of the guide holder supports a lower portion of the guide panel,
wherein any one of the cover bottom and the base block includes at least one first hole,
wherein another one of the cover bottom and the base block includes at least one coupling member protruded therefrom to face the at least one first hole, and
wherein the at least one coupling member is coupling into the at least one first hole.

2. The backlight unit of claim 1 , wherein the guide holder is made of a plastic-based material.

3. The backlight unit of claim 1 , wherein the at least one side wall includes a plurality of side walls which are separated from each other by slots.

4. The backlight unit of claim 1 , wherein the guide holder has a black color or a gray tone color.

5. The backlight unit of claim 1 , wherein the base block further includes a second hole under the light guide plate,
wherein the cover bottom further includes a tapped hole at the inner bottom surface and facing the second hole, and
wherein a screw is inserted into the tapped hole via the second hole to fix the base block to the cover bottom.

6. The backlight unit of claim 1 , wherein the at least one coupling member of the guide holder includes a boss protruded from a lower surface of the base block, and
wherein the cover bottom includes the at least one first hole into which the boss of the guide holder is inserted.

7. The backlight unit of claim 1 , wherein the guide holder includes a hook protruded from a lower surface of the base block, and
wherein the cover bottom includes the at least one first hole into which the hook of the guide holder is inserted.

8. The backlight unit of claim 1 , wherein the guide holder is attached to the cover bottom by a double-sided tape.

9. A backlight unit for a liquid crystal display device, comprising:
a light source for irradiating light;
a plurality of optical sheets disposed between the light source and a liquid crystal display panel;
a guide panel for supporting side surfaces and a portion of a lower surface of the liquid crystal display panel to maintain a space between the liquid crystal display panel and the plurality of optical sheets;
a diffusion plate disposed between the light source and the plurality of optical sheets and diffusing light from the light source to illustrate the diffused light to the plurality of optical sheets;
a cover bottom disposed below the diffusion plate; and
a plurality of guide holders fixed to an edge of the cover bottom and spaced apart in an interval,
wherein each of the guide holders includes:
a base block disposed under the diffusion plate and fixed to an inner bottom surface of the cover bottom, and
at least one side wall extended from the base block,

wherein the at least one side wall is spaced apart from the diffusion plate,
wherein the base block of the guide holder supports a lower portion of the diffusion plate, and the at least one side wall of the guide holder supports a lower portion of the guide panel,
wherein any one of the cover bottom and the base block includes at least one first hole,
wherein another one of the cover bottom and the base block includes at least one coupling member protruded therefrom to face the at least one first hole, and
wherein the at least one coupling member is coupling into the at least one first hole.

10. The backlight unit of claim 9 , wherein the guide holder is made of a plastic-based material.

11. The backlight unit of claim 9 , wherein the at least one side wall includes a plurality of side walls which are separated from each other by slots.

12. The backlight unit of claim 9 , wherein the guide holder has a black color or a gray tone color.

13. The backlight unit of claim 9 , wherein the base block further includes a second hole under the diffusion plate,
wherein the cover bottom further includes a tapped hole at the inner bottom surface and facing the second hole, and
wherein a screw is inserted into the tapped hole via the second hole to fix the base block to the cover bottom.

14. The backlight unit of claim 9 , wherein the guide holder includes a boss protruded from a lower surface of the base block, and
wherein the cover bottom includes the at least one first hole into which the boss of the guide holder is inserted.

15. The backlight unit of claim 9 , wherein the at least one coupling member of the guide holder includes a hook protruded from a lower surface of the base block, and
wherein the cover bottom includes the at least one first hole into which the hook of the guide holder is inserted.

16. The backlight unit of claim 9 , wherein the guide holder is attached to the cover bottom by a double-sided tape.

17. The backlight unit of claim 3 , wherein the light guide plate includes a groove, and
wherein a first gap between one of the side walls and the groove of the light guide plate is narrower than a second gap between another one of the side walls and the groove of the light guide plate.

18. The backlight unit of claim 11 , wherein the diffusion plate includes a groove, and
wherein a first gap between one of the side walls and the groove of the diffusion plate is narrower than a second gap between another one of the side walls and the groove of the diffusion plate.

19. The backlight unit of claim 1 , wherein the light guide plate includes a groove at which the at least one side wall is disposed.

20. The backlight unit of claim 9 , wherein the diffusion plate includes a groove at which the at least one side wall is disposed.

Assignees

• Youk Shimkeun
• Park Dongnyuck
• Jeong Haeyong
• Lg Display Co Ltd

Inventors

• Youk Shimkeun
• Park Dongnyuck
• Jeong Haeyong

Classifications

• G02F2001/133314

  Physics · mapped topic

• G02B5/0278

  used in transmission · CPC title

• G02B6/0088 Primary

  of the light guide or other optical sheets in the package · CPC title

• G02F2001/133322

  Physics · mapped topic

• G02F1/133308

  Support structures for LCD panels, e.g. frames or bezels · CPC title