Light-emitting diode lamp and light-emitting diode display device

• US 20060138440A1
• Filed: 12/22/2005
• Published: 06/29/2006
• Est. Priority Date: 12/28/2004
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Jyo, Katsuaki
• Granted Patent: US 7,566,911 B2
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: G09F 2009/3055 for traffic signs
• CPC Class Codes: G09F 2013/222 with LEDs
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/12041 LED
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

The light-emitting diode lamp has a light-emitting diode chip mounted on a cup-shaped mounting portion of a lead frame. The mounting portion is formed at one end of a lead portion of the lead frame. The light-emitting diode chip and the mounting portion are embedded in a convex shape lens made of a resin. The lead frame has a hood portion serving as a reflector. The hood portion downwardly reflects the outgoing beam of the light-emitting diode chip and also shields external incident light obliquely from the upper side. Thus, it is possible to increase the luminous efficiency in the downward direction, improve the visibility from the lower side and increase the luminous efficiency in the desired direction without any combination of complicated lens configurations.

Claims

1. A light-emitting diode lamp comprising:

a lead frame having a lead portion and a mounting portion formed at one end of the lead portion in a direction in which the lead portion extends;

a light-emitting diode chip mounted on the mounting portion; and

a resin portion through which light emitted from the light-emitting diode chip is transmitted, wherein

a directional characteristic peak of an outgoing beam emitted from the resin portion is not located on an extension axis of the lead portion in the direction in which the lead portion extends.

2. The light-emitting diode lamp as claimed in claim 1, wherein

the mounting portion of the lead frame is inclined with respect to the lead portion so that a normal line of a light-emitting surface of the light-emitting diode chip is inclined with respect to the extension axis of the lead portion.

3. The light-emitting diode lamp as claimed in claim 1, further comprising:

a reflector which is placed along the extension axis of the lead portion and whose dimension in the direction of the extension axis is changed around the extension axis.

4. The light-emitting diode lamp as claimed in claim 2, wherein

the lamp has a plurality of light-emitting diode chips, and

the plurality of light-emitting diode chips are arranged in a direction perpendicular to a plane that contains the extension axis of the lead portion and a parallel line of the normal line of the light-emitting surface of the light-emitting diode chip.

5. The light-emitting diode lamp as claimed in claim 3, wherein

the lamp has a plurality of light-emitting diode chips, and

the plurality of light-emitting diode chips are each arranged along a direction in which the reflector extends around the extension axis.

6. The light-emitting diode lamp as claimed in claim 2, wherein

the lead frame undergoes a black surface treatment.

7. The light-emitting diode lamp as claimed in claim 4, wherein

the lead frame undergoes a black surface treatment.

8. The light-emitting diode lamp as claimed in claim 1, wherein

the lead frame is fitted with a black resin located behind the light-emitting diode chip.

9. The light-emitting diode lamp as claimed in claim 1, wherein

the resin portion constitutes a convex lens.

10. The light-emitting diode lamp as claimed in claim 1, wherein

the resin portion is molded with use of a resin that has a photoabsorption band at wavelengths other than a peak wavelength of light emitted from the light-emitting diode chip, and the resin constitutes a convex lens.

11. The light-emitting diode lamp as claimed in claim 1, wherein

an inner peripheral surface of a reflection cup that surrounds at least part of the light-emitting diode chip undergoes a black surface treatment.

12. A light-emitting diode display device comprising the light-emitting diode lamp claimed in claim 1.