Backlight device for liquid crystal display and method of fabricating the same

• US 7,932,966 B2
• Filed: 10/21/2008
• Issued: 04/26/2011
• Est. Priority Date: 09/25/2002
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Jae Bum, Yang, Seung Hoon
• Primary Examiner(s): Nguyen; Dung T.
• Application Number:
  US12/289,136
• Publication Number:
  US 20090059130A1
• Time in Patent Office: 917 Days
• Field of Search: 349 61- 65
• US Class Current: 349/64
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/0031 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 6/0086 Positioning aspects
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence

Abstract

A backlight device for a liquid crystal display includes a substrate, and a plurality of white, red, green, and blue light emitting diodes arranged on the substrate.

Claims

1. A backlight device for a liquid crystal display, comprising:

a main light-guiding plate disposed at a rear of a liquid crystal panel of the liquid crystal display;

at least one sub light-guiding plate disposed at a rear of the main light-guiding plate and spaced from the main light-guiding plate;

at least one light source disposed along one side of the sub light-guiding plate, the light source includes a plurality of light emitting diodes in order of white, red, green, and blue;

a housing adjacent to the light-guiding plate for concentrating white, red, green, and blue light emitted from the light source along a first light direction, the housing is opposite to an incident surface along one side of the main light-guiding plate, both sides of the sub light-guiding plate, and a rear surface of the sub light-guiding plate; and

first and second reflecting plates disposed under the main light-guiding plate for reflecting light leaking along a side of the liquid crystal display panel opposite to the main light-guiding plate and the sub light-guiding plate.

2. The device according to claim 1, wherein the second reflecting plate includes aluminum coated with silver.

3. The device according to claim 1, wherein the sub light-guiding plate is disposed between the housing and the first and second reflecting plates.

4. A method of fabricating a backlight device for a liquid crystal display, comprising:

forming a main light-guiding plate at a rear of a liquid crystal display panel of the liquid crystal display;

forming at least one sub light-guiding plate at a rear of the main light-guiding plate, wherein the sub light-guiding plate is spaced from the main light-guiding plate;

forming at least one light source along one side of the sub light-guiding plate, the light source includes a plurality of light emitting diodes in order of white, red, green, and blue;

forming a housing along the main light-guiding plate for concentrating white, red, green, and blue light emitted from the light source along a first light direction the housing is opposite to an incident surface along one side of the main light-guiding plate, both sides of the sub light-guiding plate, and a rear surface of the sub light-guiding plate; and

forming first and second reflecting plates under the main light-guiding plate for reflecting light leaking along a side of the liquid crystal display panel opposite to the main light-guiding plate and the sub light-guiding plate.

5. The method according to claim 4, wherein the sub light-guiding plate is disposed between the housing and the first and second reflecting plates.