Edge-type backlight unit

• US 20070242474A1
• Filed: 04/17/2007
• Published: 10/18/2007
• Est. Priority Date: 04/17/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Kim, Bum Jin
• Granted Patent: US 7,344,292 B2
• Time in Patent Office: Days
• US Class Current: 362/601
• 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]

Abstract

An edge-type backlight unit having a plurality of rows of red, blue and green LEDs to provide a light source. In the backlight unit, a light guide plate has a light incidence part formed on a side surface thereof to receive light, the light guide plate inducing the light from the light incidence part to be emitted through a top surface of the light guide plate. A light source is disposed near the light incidence part of the light guide plate, and includes a plurality of red, green and blue light emitting diodes along the light incidence part. The light emitting diodes are grouped into at least three rows according to color. Here, the row of the green light emitting diodes is arranged most adjacent to the top surface of the light guide plate.

Claims

1. An edge-type backlight unit comprising:

a light guide plate having a light incidence part formed on a side surface thereof to receive light, the light guide plate inducing the light from the light incidence part to be emitted through a top surface of the light guide plate; and

a light source disposed near the light incidence part of the light guide plate, and including a plurality of red, green and blue light emitting diodes along the light incidence part, the light emitting diodes grouped into at least three rows according to color,

wherein the row of the green light emitting diodes is arranged most adjacent to the top surface of the light guide plate.

2. The edge-type backlight unit according to claim 1, wherein the red, green and blue light emitting diodes are arranged in a matrix.

3. The edge-type backlight unit according to claim 1, wherein the light emitting diodes are grouped into three rows according to color.

4. The edge-type backlight unit according to claim 3, wherein the rows of the red, green and blue light emitting diodes are arranged sequentially in an order of green-red-blue or green-blue-red in a direction perpendicular to a plane of the top surface of the light guide plate.

5. The edge-type backlight unit according to claim 1, wherein the light source includes one row of the red light emitting diodes, two rows of the green light emitting diodes and one row of the blue light emitting diodes.

6. The edge-type backlight unit according to claim 5, wherein the light source includes the rows of the red, green and blue light emitting diodes arranged sequentially in a direction perpendicular to a plane of the top surface of the light guide plate, in an order selected from the group consisting of green-red-green-blue, green-red-blue-green, green-green-red-blue, green-green-blue-red, green-blue-red-green and green-blue-green-red.

7. The edge-type backlight unit according to claim 1, wherein the light source comprises a plurality of light emitting diode packages each including two of the red, green and blue light emitting diodes.

8. The edge-type backlight unit according to claim 7, wherein the two light emitting diodes of the light emitting diode package are arranged in a direction perpendicular to a plane of the top surface of the light guide plate.