Backlight unit and display device

• US 8,393,775 B2
• Filed: 08/20/2010
• Issued: 03/12/2013
• 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, Kim, Sangjeon, Park, Sangtae, Kwon, Soonhyung, Seo, Buwan, Jung, Bupsung, Bae, Seungchoon, Ryu, Seonghwan
• Primary Examiner(s): TSO, LAURA K
• Application Number:
  US12/860,713
• Publication Number:
  US 20110051043A1
• Time in Patent Office: 935 Days
• Field of Search: 362/612, 362/613, 362/97.3
• US Class Current: 362/613
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0035 provided on the surface of the light guide or in the bulk of it
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• 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 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/486 : adapted for surface mounting

Abstract

A backlight unit and a display device including the backlight unit are discussed. According to an embodiment, a light generating device comprising: arrays of light source devices arranged on a first layer and including a first light source device and a second light source device configured emit light in opposite directions, at least one of the first and second light source devices including: a housing having inclined inner walls that define a cavity, a light emitting diode disposed in the cavity and configured to generate the light, and at least one material filled in the cavity; a reflection layer disposed on the first layer and configured to reflect the light emitted from the light source devices; and a second layer covering the light source devices and the reflection layer.

Claims

1. A light generating device comprising:

arrays of light source devices arranged on a first layer and including a plurality of light source devices, the plurality of light source devices including a first light source device and a second light source device configured to emit light in opposite directions, at least one of the first and second light source devices including;

a housing having inclined inner walls that define a cavity,

a light emitting diode disposed in the cavity and configured to generate the light, and

at least one material filled in the cavity;

a reflection layer disposed on the first layer and configured to reflect the light emitted from the plurality of light source devices; and

a second layer covering the plurality of light source devices and the reflection layer,

wherein a first angle θ

1 is formed from a line extending from the inclined inner walls of the housing with respect to a line perpendicular to a light emitting surface of the light emitting diode of the first light source device,

a second angle θ

2 is formed from a line connecting a middle point on a surface of the first light source device and a middle point on a surface of the second light source device to a line extending perpendicularly from a light emitting surface of the first light source device, and

a difference between the first angle θ

1 and the second angle θ

2 ranges from 0°

to about 78°

,

wherein the plurality of the light source devices positioned on the line extending perpendicularly from the light emitting surface of the first light source device emit light in the same direction as a light emitting direction of the first light source.

2. The light generating device of claim 1, wherein the difference between the first angle θ

1 and the second angle θ

2 is equal to or less than 30°

.

3. The light generating device of claim 1, wherein the first angle θ

1 ranges from 2°

to 70°

.

4. The light generating device of claim 3, wherein the first angle θ

1 ranges from 20°

to 50°

.

5. The light generating device of claim 1, wherein the second angle θ

2 ranges from 10°

to 80°

.

6. The light generating device of claim 5, wherein the second angle θ

2 ranges from 20°

to 50°

.

7. The light generating device of claim 1, wherein the second layer encapsulates the plurality of light source devices and the reflection layer.

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

light diffusing patterns disposed on or in the second layer and configured to diffuse the light reflected from the reflection layer,

wherein the light diffusing patterns are disposed to correspond with the plurality of light source devices.

9. The light generating device of claim 1, wherein the arrays of light source devices are arranged on the first layer in a matrix configuration.

10. The light generating device of claim 1, wherein the arrays of light source devices are arranged on the first layer in a staggered configuration.

11. A display device comprising:

a display panel configured to display images; and

a backlight unit configured to supply light to the display panel, and including a plurality of light generating blocks,

at least one of the light generating blocks including;

arrays of light source devices arranged on a first layer and including a plurality of light source devices, the plurality of light source devices including a first light source device and a second light source device configured to emit light in opposite directions, at least one of the first and second light source devices including;

a housing having inclined inner walls that define a cavity,

a light emitting diode disposed in the cavity and configured to generate the light, and

at least one material filled in the cavity;

a reflection layer disposed on the first layer and configured to reflect the light emitted from the plurality of light source devices; and

a second layer covering the plurality of light source devices and the reflection layer,

wherein a first angle θ

1 is formed from a line extending from the inclined inner walls of the housing with respect to a line perpendicular to a light emitting surface of the light emitting diode of the first light source device,

a second angle θ

2 is formed from a line connecting a middle point on a surface of the first light source device and a middle point on a surface of the second light source device to a line extending perpendicularly from a light emitting surface of the first light source device, and

a difference between the first angle θ

1 and the second angle θ

2 ranges from 0°

to about 78°

,

wherein the plurality of the light source devices positioned on the line extending perpendicularly from the light emitting surface of the first light source device emit light in the same direction as a light emitting direction of the first light source.

12. The display device of claim 11, wherein the difference between the first angle θ

1 and the second angle θ

2 is equal to or less than 30°

.

13. The display device of claim 11, wherein the first angle θ

1 ranges from 2°

to 70°

.

14. The display device of claim 13, wherein the first angle θ

1 ranges from 20°

to 50°

.

15. The display device of claim 11, wherein the second angle θ

2 ranges from 10°

to 80°

.

16. The display device of claim 15, wherein the second angle θ

2 ranges from 20°

to 50°

.

17. The display device of claim 11, wherein the second layer encapsulates the plurality of light source devices and the reflection layer.

18. The display device of claim 11, the at least one of the light generating blocks further comprising:

light diffusing patterns disposed on or in the second layer and configured to diffuse the light reflected from the reflection layer,

wherein the light diffusing patterns are disposed to correspond with the plurality of light source devices.

19. The display device of claim 11, wherein the arrays of light source devices are arranged on the first layer in a matrix configuration.

20. The display device of claim 11, wherein the arrays of light source devices are arranged on the first layer in a staggered configuration.