Patent Publication Number: US-2003234431-A1

Title: Led package

Description:
BACKGROUND OF THE INVENTION  
       [0001] 1. Field of Invention  
       [0002] The present invention relates to a packaging design for light emitting diode (LED), more particularly, to a LED package contains three LED dies. 2. Description of Related Art  
       [0003] Light emitting diode (LED) is a junction diode formed by an epitaxial P-type layer and an epitaxial N-type layer on a heavily doped semiconductor compound base. The diode further includes an ohmic metallic contact on the P-type and N-type layers. LED is mainly packaged within an epoxy or a metallic housing. Visible LED are generally used in display screens, automobile braking lights, scanners, indicator lights for equipment and so on.  
       [0004] Surface-mount device LED (SMD LED) was developed in the early 1980s. For assembling SMD LED, the chip is glued or eutectic bonded to a metallic system carrier, what is referred to as a leadframe, namely on a central part or island thereof given standard components or, respectively, standard ICs, and wires are bonded to the chip. The chip is also completely enveloped with a plastic molding compound in an injection molding process such that only the ends of the system carrier serving as outer terminals project therefrom.  
       [0005] SMD LEDs have several of specification, such as 1206M(3.0 mm*1.5 mm*0.7 mm), 1206P (with a size of 3.0 mm*1.5 mm*0.7 mm), 0805M (with a size of 2.0 mm*1.2 mm*0.6 mm), and 0603M (with a size of 1.6 mm*0.8 mm*0.5 mm). Because the 0603M model is especially small in size, only single light emitting diode could be contained in the LED package in accordance with the prior art.  
       [0006] As soon as the rapid development of mobile phones and PDAs (Personal Digital Assistants), there is a request to develop colorful LED panels to display colorful images. Therefore, it is necessary to develop a LED package with three (3) light emitting diodes (generally red, blue, and green).  
       [0007] However, particularly for the smallest 0603M model, the conventional LED package can contain only one die, so it is impossible to generate colorful images. Therefore, in order to display colorful images, it is very important for the LED package industry to create a package assembly containing at least a red, a blue, and a green light emitting diodes.  
       SUMMARY OF THE INVENTION  
       [0008] It is the main object of the present invention to provide a LED package with three different light emitting diodes (red, blue, and green).  
       [0009] The second object of the present invention is to disclose a LED package.  
       [0010] The third object of the present invention is to provide a method for manufacturing a LED package.  
       [0011] The first embodiment of the present invention discloses a LED package, which is comprised of a flat panel base and three LED dies. The flat panel base is composed of a first golden film area, a second golden film area, a third golden film area, a fourth golden film area, a first connection area, and a second connection area, wherein the first connection area and the second connection area are connected to the first golden film area. The first LED die is attached on the flat panel base by flip-chip mounting, wherein an anode of the first LED die is connected to the first golden film area, and a cathode of the first LED die is connected to the second golden film area. The second LED die is attached on the flat panel base by flip-chip mounting, wherein the second LED die is composed of an anode connected to the first golden film area, and a cathode connected to the fourth golden film area. The third LED die is attached on the third golden film area; wherein the third LED die is composed of an anode connected to the first golden film area by a metallic wire, and a cathode connected to the third golden film area.  
       [0012] The second embodiment of the present invention discloses a LED package, which is comprised of a flat panel base and three LED dies. The flat panel base is composed of a first golden film area, a second golden film area, a third golden film area, a fourth golden film area, a first connection area, and a second connection area, wherein the first connection area and the second connection area are connected to the first golden film area. The first LED die is attached on the flat panel base by flip-chip mounting, wherein a cathode of the first LED die is connected to the first golden film area, and an anode of the first LED die is connected to the second golden film area. The second LED die is attached on the flat panel base by flip-chip mounting, wherein the second LED die is composed of a cathode connected to the first golden film area, and an anode connected to the fourth golden film area. The third LED die is attached on the third golden film area; wherein the third LED die is composed of a cathode connected to the first golden film area by a metallic wire, and an anode connected to the third golden film area.  
       [0013] The process flow of the method of manufacturing a LED package according to the present invention is also disclosed. A flat panel base is first provided. Thereafter, the first golden film area, the second golden film area, the third golden film area, the fourth golden film area, the first connection area, and the second connection area are formed on the flat panel base. After that, the first LED die, the second LED die, and the third LED die are attached on the flat panel base by means of silver glue.  
       [0014] Next, the anode or cathode of the third LED die is connected to the common anode or common cathode of the LED package by wire bonding.  
       [0015] Thereafter, a PCB is formed by using a glue plate and a mold, and then the PCB is cut by using a cutter. Finally, a step of classification is performed by inputting a stable current into the LED package. 
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
     [0016] The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings,  
     [0017]FIG. 1 schematically illustrates the top-view diagram of the LED package according to the first embodiment of the present invention;  
     [0018]FIG. 2 schematically illustrates the top-view diagram of the LED package according to the second embodiment of the present invention;  
     [0019]FIG. 3 discloses the process flow of the method of manufacturing a LED package according to the present invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
     [0020] The present invention relates to a packaging design for light emitting diode (LED), more particularly, to a LED package contains three LED dies.  
     [0021] First please refer to FIG. 1, which schematically illustrates the top-view diagram of the LED package according to the first embodiment of the present invention. The LED package is composed of a flat panel base  10 , the first LED die  40   a,  the second LED die  40   b,  and the third LED die  40   c.    
     [0022] The flat panel base  10  is composed of a first golden film area  20   a , a second golden film area  20   b , a third golden film area  20   c , a fourth golden film area  20   d , a first connection area  30   a , and a second connection area  30   b . The first connection area  30   a  and the second connection area  30   b  are connected to the first golden film area  20   a.    
     [0023] The first golden film area  20   a  serves as the common anode of the LED package. The second golden film area  20   b  serves as the cathode for blue color of the LED package. The third golden film area  20   c  works as the cathode for green color of the LED package. The fourth film area  20   d  works as the cathode for the red color of the LED package.  
     [0024] The first LED die  40   a  is a blue-colored light emitting diode manufactured from InGaN. The first LED die  40   a  is attached on the flat panel base  10  by flip-chip mounting. The anode of the first LED die  40   a  is connected to the first connection area  30   a  and then to the first golden film area 20   a . The cathode of the first LED die  40   a  is connected to the second golden film area  20   b.    
     [0025] The second LED die  40   b  is a green-colored light emitting diode manufactured from InGaN. The second LED die  40   b  is attached on the flat panel base  10  by flip-chip mounting. The anode of the second LED die  40   b  is connected to the second connection area  30   b , and then to the first golden film area  20   a . The cathode of the second LED die  40   b  is connected to the fourth golden film area  20   d.    
     [0026] The third LED die  40   c  is a red-colored light emitting diode attached on the third golden film area  20   c . The anode of the third LED die  40   c  is connected to the first golden film area  20   a  by a metallic wire  50 . The cathode of the third LED die  40   c  is connected to the third golden film area  20   c.    
     [0027] According to a preferred embodiment of the present invention, the LED package can specially be a 0603 model package.  
     [0028] Please then to FIG. 2, which schematically illustrates the top-view diagram of the LED package according to the second embodiment of the present invention. The LED package is composed of a flat panel base  10 , the first LED die  40   a , the second LED die  40   b , and the third LED die  40   c.    
     [0029] The flat panel base  10  is composed of a first golden film area  20   a , a second golden film area  20   b , a third golden film area  20   c , a fourth golden film area  20   d , a first connection area  30   a , and a second connection area  30   b . The first connection area  30   a  and the second connection area  30   b  are connected to the first golden film area  20   a.    
     [0030] The first golden film area  20   a  serves as the common cathode of the LED package. The second golden film area  20   b  serves as the anode for blue color of the LED package. The third golden film area  20   c  works as the anode for green color of the LED package. The fourth film area  20   d  works as the anode for the red color of the LED package.  
     [0031] The first LED die  40   a  is a blue-colored light emitting diode manufactured from InGaN. The first LED die  40   a  is attached on the flat panel base  10  by flip-chip mounting. The cathode of the first LED die  40   a  is connected to the first connection area  30   a  and then to the first golden film area 20   a . The anode of the first LED die  40   a  is connected to the second golden film area  20   b.    
     [0032] The second LED die  40   b  is a green-colored light emitting diode manufactured from InGaN. The second LED die  40   b  is attached on the flat panel base  10  by flip-chip mounting. The cathode of the second LED die  40   b  is connected to the second connection area  30   b , and then to the first golden film area  20   a . The anode of the second LED die  40   b  is connected to the fourth golden film area  20   d.    
     [0033] The third LED die  40   c  is a red-colored light emitting diode attached on the third golden film area  20   c . The cathode of the third LED die  40   c  is connected to the first golden film area  20   a  by a metallic wire  50 . The anode of the third LED die  40   c  is connected to the third golden film area  20   c.    
     [0034] According to a preferred embodiment of the present invention, the LED package can specially be a 0603 model package.  
     [0035] Referring then to FIG. 3, the process flow of the method of manufacturing a LED package according to the present invention is disclosed. A flat panel base  10  is first provided (step  101 ). Thereafter, the first golden film area  20   a , the second golden film area  20   b , the third golden film area 20   c , the fourth golden film area  20   d , the first connection area  30   a , and the second connection area  30   b  are formed on the flat panel base  10  (step  102 ). After that, the first LED die  40   a , the second LED die  40   b , and the third LED die  40   c  are attached on the flat panel base by means of silver glue (step  103 ).  
     [0036] Next, the anode or cathode of the third LED die  40   c  is connected to the common anode or common cathode of the LED package by means of wire bonding (step  104 ).  
     [0037] Thereafter, a PCB is formed by using a glue plate and a mold (step  105 ), and then the PCB is cut by using a cutter (step  106 ). Finally, a step of classification is performed by inputting a stable current into the LED package (step  107 ).  
     [0038] While the present invention has been described with the reference to a preferred embodiment thereof, those skilled in the art will appreciate various changes in form and detail may be made without departing from the intended scope of the present invention as defined in the appended claims.