Light-emitting diode and backlight system using the same

• US 20050052871A1
• Filed: 09/27/2004
• Published: 03/10/2005
• Est. Priority Date: 07/11/2003
• Status: Abandoned Application

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Leu, Charles, Chen, Ga-Lane, Yu, Tai-Cherng
• Application Number:
  US10/951,848
• Publication Number:
  US 20050052871A1
• Time in Patent Office: Days
• US Class Current: 362/311.20
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin

Abstract

A light-emitting diode (LED) (10) includes a chip body (103), an encapsulation can (105) surrounding the chip body, and a base (106) supporting the encapsulation can and the chip body thereon. Numerous particles (1050) are provided in the encapsulation can. With the particles, light beams from the chip body are diffused and attain wider irradiation angles. A backlight system (900) includes a light guide plate (20), and a number of the above-described LEDs disposed adjacent to the light guide plate. Light beams having wide irradiation angles are emitted from the LEDs and enter the light guide plate. This enables a light emitting surface of the light guide plate to have highly uniform brightness.

Claims

1. A light-emitting diode comprising:

a base;

a chip body fixed on the base; and

an encapsulation can covering the chip body;

wherein a plurality of particles is contained in the encapsulation can for scattering light emitted from the chip body.

2. The light-emitting diode as claimed in claim 1, wherein the particles are spherical.

3. The light-emitting diode as claimed in claim 2, wherein diameters of the particles are in the range from 1 μ

m to 2 μ

m.

4. The light-emitting diode as claimed in claim 1, wherein the particles are made of a polymer material.

5. The light-emitting diode as claimed in claim 4, wherein the particles are made of melamine resin.

6. The light-emitting diode as claimed in claim 4, wherein the particles are made of poly-methyl methacrylate.

7. A backlight system comprising:

a light guide plate having a light incident surface, a light emitting surface adjacent the light incident surface, and a bottom surface opposite to the light emitting surface; and

at least one light-emitting diode having a base, a chip body fixed on the base, and an encapsulation can covering the chip body;

wherein a plurality of particles is contained in the encapsulation can for scattering light emitted from the chip body.

8. The backlight system as claimed in claim 7, wherein the particles are spherical.

9. The backlight system as claimed in claim 8, wherein diameters of the particles are in the range from 1 μ

m to 2 μ

m.

10. The backlight system as claimed in claim 7, wherein the particles are made of a polymer material.

11. The backlight system as claimed in claim 10, wherein the particles are made of melamine resin.

12. The backlight system as claimed in claim 10, wherein the particles are made of poly-methyl methacrylate.

13. The backlight system as claimed in claim 7, wherein an antireflective film coated on the light incident surface.

14. The backlight system as claimed in claim 7, wherein a brightness enhancement film is coated on the light incident surface.

15. A backlight system comprising:

a light source;

a light guide member disposed beside said light source and having a incident surface facing said light source to allow light from said light source passing through said incident surface and into said light guide member for further light transmission by said light guide member; and

a plurality of scatter means located between said light source and said incident surface of said light guide member to form an scatter zone surrounding said light source so as to interferingly scatter all of said light from said light source.

16. The backlight system as claimed in claim 15, wherein said scatter means are disposed in an encapsulation can formed on said light source.

17. The backlight system as claimed in claim 15, wherein said scatter means are particles of polymer material.

18. The backlight system as claimed in claim 15, wherein said scatter means are one of transparent, translucent and opaque.