Backlight unit in liquid crystal display

• US 20020071288A1
• Filed: 06/29/2001
• Published: 06/13/2002
• Est. Priority Date: 12/13/2000
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Lim, Moo Jong
• Granted Patent: US 6,923,548 B2
• Time in Patent Office: Days
• US Class Current: 362/558
• CPC Class Codes: G02B 5/02 Diffusing elements; Afocal elements
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 1/133622 Colour sequential illumination
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A backlight unit in a liquid crystal display enabling to realize high brightness over 2000 nit and provide a thin backlight unit is described. In a backlight unit using LED as a backlight lamp in a field sequence type liquid crystal display including a light-guiding plate, a reflection plate, and a diffusion plate, a plurality of lamps or chips are arranged such that LED chips realizing R, G, and B colors are built in the respective lamps or chips.

Claims

1. A backlight unit in a liquid crystal display including a light-guiding plate, a reflection plate, and a diffusion plate, the backlight unit using LED as a backlight lamp, the liquid crystal display following a field sequence,

wherein a plurality of lamps are arranged such that LED chips realizing R, G, and B colors are built in the respective lamps.

2. The backlight unit in a liquid crystal display of claim 1, wherein each of the lamps has a luminescent area over 100°

.

3. The backlight unit in a liquid crystal display of claim 1, wherein each interval of the lamps lies within 10 mm.

4. The backlight unit in a liquid crystal display of claim 1, wherein a distance between the lamp and diffusion plate lies within 5 mm.

5. A backlight unit in a liquid crystal display including a light-guiding plate, a reflection plate, and a diffusion plate, the backlight unit using LED as a backlight lamp, the liquid crystal display following a field sequence,

wherein a plurality of chips are arranged such that LED chips realizing R, G, and B colors are built in the respective chips.

6. The backlight unit in a liquid crystal display of claim 5, wherein each of the chips has a luminescent area over 100°

.

7. The backlight unit in a liquid crystal display of claim 5, wherein each interval of the chips lies within 10 mm.

8. The backlight unit in a liquid crystal display of claim 5, wherein a distance between the chip and diffusion plate lies within 5 mm.

9. A backlight unit in a liquid crystal display including a light-guiding plate, a reflection plate, and a diffusion plate, the backlight unit using LED as a backlight lamp, the liquid crystal display following a field sequence, the backlight unit further comprising:

a plurality of lamps arranged alternatively in a plurality of rows; and

three LED chips built in each of the lamps, the three LED chips realizing R, G, and B colors respectively,

wherein the lamps are turned on/off according to a sequence of a R chip, a G chip, and a B chip in each of the rows.

10. A backlight unit in a liquid crystal display including a light-guiding plate, a reflection plate, and a diffusion plate, the backlight unit using LED as a backlight lamp, the liquid crystal display following a field sequence, the backlight unit further comprising:

a plurality of chips arranged alternatively in a plurality of rows; and

three LED chips built in each of unit chips, the three LED chips realizing R, G, and B colors respectively,

wherein the unit chips are turned on/off according to a sequence of a R chip, a G chip, and a B chip in each of the rows.