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

• US 7,284,890 B2
• Filed: 04/18/2007
• Issued: 10/23/2007
• Est. Priority Date: 09/26/2002
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Yang, Seung Hoon, Ahn, In Ho, Kim, Jae Burn
• Primary Examiner(s): Alavi; Ali
• Assistant Examiner(s): HAN, JASON
• Application Number:
  US11/785,493
• Publication Number:
  US 20070189037A1
• Time in Patent Office: 188 Days
• Field of Search: 362/231, 362/252, 362/555, 362/612, 362/800, 349 68- 69
• US Class Current: 362/612
• 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: Y10S 362/80 Light emitting diode

Abstract

A backlight device for a liquid crystal includes a substrate, a light source including a first plurality of green light emitting diodes, a second plurality of blue light emitting diodes, and a third plurality of red light emitting diodes arranged along a first row direction on the substrate in an offset matrix-type configuration, wherein white light emitting diodes are disposed at both ends of the configuration of the green, blue, and red light emitting diodes.

Claims

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

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

a first light source for emitting light along at least one side of the light-guiding plate, the first light source having a first sequential arrangement of green, blue, and green light emitting diodes along a first row direction, and at least one white light emitting diode at one end of the first sequential arrangement of the green, blue, and green light emitting diodes;

a second light source for emitting light along the at least one side of the light-guiding plate, the second light source having a second sequential arrangement of blue, green, and red light emitting diodes along a second row direction different from the first row direction, and at least one white light emitting diode at one end of the second sequential arrangement of the blue, green, and red light emitting diodes;

a housing adjacent to the light-guiding plate affixing the first and second light sources and concentrating the light emitted from the first and second light sources along a first light direction; and

a reflecting plate disposed at a lower portion of the light-guiding plate for

reflecting light leaking along a side of the liquid crystal display panel.

2. The device according to claim 1, wherein the respective white light-emitting diodes of the first and second light sources are arranged at the ends of the first and second row directions.

3. The device according to claim 1, wherein the housing includes aluminum.

4. The device according to claim 1, wherein the first and second light sources are arranged along both sides of the light-guiding plate.

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

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

a sub light-guiding plate disposed on an incident surface along one side of the main light-guiding plate;

a first light source for emitting light along one side of the sub light-guiding plate, the first light source includes a first sequential arrangement of green, blue, and green light emitting diodes along a first row direction, and at least one white light emitting diode at an end of the first sequential arrangement of the green, blue, and green light emitting diodes;

a second light source for emitting light along the one side of the sub light-guiding plate, the second light source includes a second sequential arrangement of blue, green, and red light emitting diodes along a second row direction different from the first row direction, and at least one white light emitting diode at an end of the second sequential arrangement of the blue, green, and red light emitting diodes;

a housing adjacent to the main light-guiding plate affixing the first and second light sources and concentrating the light emitted from the first and second light sources along a first light direction; and

first and second reflecting plates disposed at a lower portion of the main light-guiding plate for reflecting light leaking along a side of the liquid crystal display panel.

6. The device according to claim 5, wherein the second reflecting plate includes aluminum coated with silver.

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

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

forming a first light source for emitting light along at least one side of the light-guiding plate, the first light source having a first sequential arrangement of green, blue, and green light-emitting diodes along a first row direction, and at least one white light-emitting diode at one end of the first sequential arrangement of the green, blue, and green light-emitting diodes;

forming a second light source for emitting light along the at least one side of the light-guiding plate, the second light source having a second sequential arrangement of blue, green, and red light emitting diodes along a second row direction different from the first row direction, and at least one white light emitting diode at one end of the second sequential arrangement of the blue, green, and red light emitting diodes;

forming a housing adjacent to the light-guiding plate affixing the first and second light sources and concentrating the light emitted from the first and second light sources along a first light direction; and

forming a reflecting plate at a lower portion of the light-guiding plate for

reflecting light leaking along a side of the liquid crystal display panel.

8. The method according to claim 7, wherein the respective white light-emitting diodes of the first and second light sources are arranged at the ends of the first and second row directions.

9. The method according to claim 7, wherein the housing includes aluminum.

10. The method according to claim 7, wherein the first and second light sources are arranged along both sides of the light-guiding plate.

11. 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 a sub light-guiding plate on an incident surface along one side of the main light-guiding plate;

forming a first light source for emitting light along one side of the sub light-guiding plate, the first light source includes a first sequential arrangement of green, blue, and green light emitting diodes along a first row direction, and at least one white light emitting diode at an end of the first sequential arrangement of the green, blue, and green light emitting diodes;

forming a second light source for emitting light along the one side of the sub light-guiding plate, the second light source includes a second sequential arrangement of blue, green, and red light emitting diodes along a second row direction different from the first row direction, and at least one white light emitting diode at an end of the second sequential arrangement of the blue, green, and red light emitting diodes;

forming a housing adjacent to the main light-guiding plate affixing the first and second light sources and concentrating the light emitted from the first and second light sources along a first light direction; and

forming first and second reflecting plates at a lower portion of the main light-guiding plate for reflecting light leaking along a side of the liquid crystal display panel.

12. The method according to claim 11, wherein the second reflecting plate includes aluminum coated with silver.