Hybrid backlight apparatus

• US 20060245209A1
• Filed: 05/01/2006
• Published: 11/02/2006
• Est. Priority Date: 05/02/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Jeong, Ho Seop, Kawai, Kiyoyuki, Kim, Jin Jong
• Application Number:
  US11/414,294
• Publication Number:
  US 20060245209A1
• Time in Patent Office: Days
• US Class Current: 362/612
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white

Abstract

The present invention relates to a backlight apparatus for a Liquid Crystal Display. The backlight apparatus includes a main light source for generating white light and a monochromatic light source for generating monochromatic light to compensate the color temperature of the white light. The backlight further includes a light mixing region for mixing the white light with the monochromatic light to form mixed light with compensated color temperature and a reflection plate disposed underneath the light mixing region. The invention provides the monochromatic light source in addition to the fluorescent lamp, widening the color expression range and effectively adjusting the color temperature, thereby enabling natural color expression.

Claims

1. A hybrid backlight apparatus comprising:

a main light source for generating white light;

a supplementary light source for generating monochromatic light to compensate color temperature of the white light of the main light source;

a light mixing region for mixing the white light with the monochromatic light to form mixed light with compensated color temperature; and

a reflection plate disposed underneath the light mixing region.

2. The hybrid backlight apparatus according to claim 1, wherein the white light has a color temperature ranging from 20000K to 7000K, and the supplementary light source generates the supplementary light to have a color temperature ranging from 12000K to 5000K.

3. The hybrid backlight apparatus according to claim 1, wherein the main light source comprises a fluorescent lamp.

4. The hybrid backlight apparatus according to claim 1, wherein the monochromatic light is red light.

5. The hybrid backlight apparatus according to claim 4, wherein the supplementary light source comprises at least one selected from a group including a light emitting diode, a laser diode and a monochromatic filter lamp.

6. The hybrid backlight apparatus according to claim 4, wherein the output of the supplementary light source is 5% to 20% of the output of the main light source.

7. The hybrid backlight apparatus according to claim 1, wherein the monochromatic light is red light,

the backlight apparatus further comprising a second supplementary light source for generating green light to mix with the mixed light.

8. The hybrid backlight apparatus according to claim 7, wherein the second supplementary light source comprises at least one selected from a group including a light emitting diode, a laser, a laser diode, a monochromatic filter lamp.

9. The hybrid backlight apparatus according to claim 1, wherein the light mixing region comprises a light guide plate, and the main light source and the supplementary light source are disposed at an edge of the light guide plate.

10. The hybrid backlight apparatus according to claim 9, wherein the main light source and the supplementary light source are disposed at different edges of the light guide plate.

11. The hybrid backlight apparatus according to claim 9, wherein the main light source and the supplementary light source are disposed at the same edge of the light guide plate.

12. The hybrid backlight apparatus according to claim 1, further comprising a housing which forms the light mixing region along with the reflection plate, wherein the main light source and the supplementary light source are disposed in the housing.

13. The hybrid backlight apparatus according to claim 12, wherein the main light source is supported by a side wall of the housing.