Backlight unit of liquid crystal display device and liquid crystal display device using the same

• US 8,235,571 B2
• Filed: 06/23/2005
• Issued: 08/07/2012
• Est. Priority Date: 06/30/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Park, Hee Jeong
• Primary Examiner(s): PAYNE, SHARON E
• Application Number:
  US11/159,276
• Publication Number:
  US 20060002151A1
• Time in Patent Office: 2,602 Days
• Field of Search: 362/555, 362/558, 362/561, 362/631, 362/97.3, 257/81, 257/95, 439/62, 439/64, 439/69, 313/498
• US Class Current: 362/555
• CPC Class Codes: G02F 1/133603 with LEDs

Abstract

A direct-type backlight unit having a plurality of light emitting diodes and a liquid crystal display device having the same are disclosed. The backlight unit includes a printed circuit board (PCB); a plurality of light emitting diodes (LEDs) formed on the PCB for emitting light; and a light diffusion unit included in each of the LEDs for diffusing light.

Claims

1. A liquid crystal display (LCD) device, comprising:

a liquid crystal panel;

a printed circuit board (PCB);

a plurality of light emitting diodes (LEDs) on the PCB; and

a plurality of fine patterns directly formed on an entire upper portion of each LED for diffusing light,

wherein the upper portion has a semi-sphere shape,

wherein each fine pattern has a dot shape,

wherein each fine pattern is a mixture of a light diffusion material, a pigment and an adhesive, and

wherein the fine patterns expose a part of the convex surface of the lens of each LED.

2. A display device, comprising:

a display panel and a backlight unit, the backlight unit including a printed circuit board (PCB), a plurality of light emitting diodes (LED) on the PCB and a lens on each of the LEDs,

wherein a diffusion pattern is directly formed on an entire upper portion of each LED for diffusing light,

wherein the diffusion pattern includes a plurality of fine patterns directly formed on the entire upper portion,

wherein the upper portion has a semi-sphere shape,

wherein each fine pattern has a dot shape,

wherein each fine pattern is a mixture of a light diffusion material, a pigment and an adhesive,

wherein the diffusion pattern expose a part of the convex surface of the lens.

3. The display device according to claim 2, wherein the diffusion pattern is on a transparent sheet and is attached on the surface of the lens.