Backlight unit and display device

• US 8,556,444 B2
• Filed: 08/20/2010
• Issued: 10/15/2013
• Est. Priority Date: 08/27/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Sungwoo, Seo, Buwan, Hur, Hoon, Kwon, Soonhyung, Bae, Seungchoon, Kim, Minho, Lee, Hyunho, Hwang, Sangsoo, Park, Sangtae, Jung, Bupsung
• Primary Examiner(s): Guharay, Karabi
• Application Number:
  US12/860,690
• Publication Number:
  US 20110051411A1
• Time in Patent Office: 1,152 Days
• Field of Search: 362 971- 973, 362/235, 362/236, 362/239, 362/246, 349/62
• US Class Current: 362/97.3
• CPC Class Codes: G02F 1/13 based on liquid crystals, e.g. single liquid crystal display cells
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources

Abstract

A backlight unit and display device are discussed. According to an embodiment, a light generating device includes an array of light source devices disposed on a substrate and including first and second light source devices forming a first line, the first and second light source devices spaced apart from each other with a first distance and configured to emit light in a first direction; another array of light source devices disposed on the substrate and including third and fourth light source devices forming a second line, the third and fourth light source devices spaced apart from each other with a third distance and configured to emit light in a second direction which is different from the first direction, the second line being spaced apart from the first line so that the first light source device is spaced apart from the third light source device with a second distance therebetween.

Claims

1. A light generating device comprising:

an array of light source devices disposed on a substrate and including first and second light source devices forming a first line, the first and second light source devices spaced apart from each other with a first distance and configured to emit light in a first direction;

another array of light source devices disposed on the substrate and including a third light source device forming a second line, the third light source device configured to emit light in a second direction which is different from the first direction,

the second line being spaced apart from the first line so that the first light source device is spaced apart from the third light source device with a second distance therebetween,

the second distance being equal to or greater than the first distance; and

a reflection layer configured to reflect the light emitted from the first and second light source devices,

wherein a light emitting part of the second light source device and a light emitting part of the third light source device are positioned on a same vertical line that is perpendicular to the first direction.

2. The light generating device of claim 1, wherein the first direction is substantially opposite to the second direction.

3. The light generating device of claim 1, wherein the first distance is measured from a middle point on a surface of the first light source device to a middle point on a surface of the second light source device.

4. The light generating device of claim 3, wherein the surface of the first light source device is a light emitting surface, and the surface of the second light source device is a surface opposite a light emitting surface of the second light source device.

5. The light generating device of claim 1, wherein the second distance is measured from a middle point on a surface of the first light source device to a middle point on a surface of the third light source device.

6. The light generating device of claim 5, wherein the surface of the first light source device is a light emitting surface, and the surface of the third light source device is a light emitting surface.

7. The light generating device of claim 1, wherein the first and second light source devices are disposed along a first side edge of the substrate, and

a distance from the first side edge of the substrate to one side of the first light source device is less than a distance from another side of the first light source device to a line extending from one side of the third light source device.

8. The light generating device of claim 1, further comprising:

at least one fourth light source device forming a third line, the fourth light source device configured to emit light in the first direction,

wherein the third and fourth light source devices are disposed along a second side edge of the substrate,

the fourth light source device is disposed at a corner area formed by the second side edge and a third side edge of the substrate, and

a distance from the third side edge of the substrate to one side of the fourth light source device is less than a distance from another side of the fourth light source device to a line extending from one side of the first light source device.

9. The light generating device of claim 1, further comprising:

a resin layer covering the arrays of light source devices on the substrate; and

diffusion patterns disposed on the resin layer.

10. The light generating device of claim 9, wherein the diffusion patterns are located to correspond with the light source devices.

11. The light generating device of claim 1, further comprising:

diffusion patterns disposed on the reflection layer, wherein a configuration of the diffusion patterns changes in a light emitting direction of the light source devices.

12. A light generating device comprising:

first light source devices disposed on a substrate and spaced apart from each other with a first distance therebetween, the first light source devices forming a first line and configured to emit light in a first direction;

second light source devices disposed on the substrate and spaced apart from each other with a second distance therebetween, the second light source devices forming a second line and configured to emit light in a second direction which is different from the first direction,

a width ‘

t’

of at least one of the first and second light source devices having the following relationship;

2t≦

d≦

10t, where ‘

d’

is a distance between a line extending along a first side of one of the first light source devices and a line extending along a second side of one of the second light source devices;

a reflection layer configured to reflect the light emitted from the first and second light source devices;

a resin layer covering the first and second lines of the light source devices on the substrate; and

diffusion patterns disposed on the resin layer, and separately located to correspond with the first and second light source devices.

13. The light generating device of claim 12, wherein the distance ‘

d’

has the following relationship with the width ‘

t’

;

3t≦

d≦

8t.

14. The light generating device of claim 12, wherein the first side of one of the first light source devices and the second side of one of the second light source devices are light emitting surface sides through which the light is emitted.

15. The light generating device of claim 12, wherein the first light source devices are disposed along an edge of the substrate, and

a distance from the edge of the substrate to one side of one of the first light source devices is less than a distance from another side of the one of the first light source devices to a line extending from one side of one of the second light source devices.

16. The light generating device of claim 12, wherein the distance ‘

d’

has the following relationship;

2t=d.

17. A light generating device comprising:

first light source devices disposed on a substrate and spaced apart from each other with a first distance therebetween, the first light source devices forming a first line and configured to emit light in a first direction;

second light source devices disposed on the substrate and spaced apart from each other with a second distance therebetween, the second light source devices forming a second line and configured to emit light in a second direction which is different from the first direction,

wherein a light emitting part of one of the first light source devices and a light emitting part of one of the second light source devices are positioned on a same vertical line that is perpendicular to the first direction; and

a reflection layer configured to reflect the light emitted from the first and second light source devices.