LED package structure with concave area for positioning heat-conducting substance and method for manufacturing the same

• US 8,008,099 B2
• Filed: 09/12/2009
• Issued: 08/30/2011
• Est. Priority Date: 07/08/2009
• Status: Active Grant

• Current Assignee: Paragon Semiconductor Lighting Technology Co., Ltd.
• Original Assignee: Paragon Semiconductor Lighting Technology Co., Ltd.
• Inventors: Chung, Chia-Tin
• Primary Examiner(s): NGUYEN, CUONG QUANG
• Application Number:
  US12/558,492
• Publication Number:
  US 20110006318A1
• Time in Patent Office: 717 Days
• Field of Search: 438 22- 28, 438/E33.059, 438/E33.067
• US Class Current: 438/22
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• 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 2933/0075 relating to heat extraction or cooling elements
• CPC Class Codes: H01L 33/642 characterized by the shape

Abstract

An LED package structure with concave area for positioning heat-conducting substance includes a substrate unit, a heat-conducting adhesive unit, a light-emitting unit, a conductive unit and a package unit. The substrate unit has a substrate body, a concave space formed on the substrate body, and a plurality of positive and negative pads exposed on the substrate body. The heat-conducting adhesive unit has a heat-conducting adhesive layer positioned in the concave space. The light-emitting unit has a plurality of LED chips disposed on the heat-conducting adhesive layer and received in the concave space. The conductive unit has a plurality of wires. Each LED chip is electrically connected between each positive pad and each negative pad. The package unit has a translucent package resin body disposed on the substrate body in order to cover the LED chips and the wires.

Claims

1. A method for manufacturing an LED package structure with concave area for positioning heat-conducting substance, comprising:

providing a substrate unit, wherein the substrate unit has a substrate body, at least one concave space formed on a top surface of the substrate body, a plurality of positive pads exposed on the top surface of the substrate body and a plurality of negative pads exposed on the top surface of the substrate body;

placing a plurality of heat-conducting adhesive balls in the at least one concave space;

placing a plurality of LED chips on the heat-conducting adhesive balls, wherein each LED chip has a positive electrode and a negative electrode;

transforming the heat-conducting adhesive balls into a heat-conducting adhesive layer by a reflow process in order to fix the LED chips in the at least one concave space of the substrate unit;

electrically connecting each LED chip between each positive pad and each negative pad by a plurality of wires, wherein every two wires are respectively electrically connected between the positive electrode of each LED chip and each positive pad and between the negative electrode of each LED chip and each negative pad; and

forming a translucent package resin body on the top surface of the substrate body in order to cover the LED chips and the wires.

2. The method according to claim 1, wherein before the step of forming the translucent package resin body, the method comprises:

surroundingly coating liquid resin on the top surface of the substrate body, and then hardening the liquid resin to form an annular reflecting resin body, wherein the annular reflecting resin body surrounds the LED chips to form a resin position limiting space above the substrate body, and the position of the translucent package resin body is limited in the resin position limiting space.

3. The method according to claim 1, wherein each heat-conducting adhesive ball is a solder ball or solder paste, a Ni/Pd/Au alloy is disposed between the substrate body and the heat-conducting adhesive layer, and the LED chips are disposed over the Ni/Pd/Au alloy by the heat-conducting adhesive layer.

4. The method according to claim 1, wherein the at least one concave space is a ladder-type groove or is composed of a plurality of poculiform grooves.