JPH065922A - Multicolor light emitting diode - Google Patents

Abstract

(57) [Summary] [Object] To provide a multicolor light emitting diode which can obtain multicolor light emission and which is not large in size. [Structure] A semiconductor material is epitaxially grown with different compositions to form one LED pellet 10.
The pellet 10 was divided by a kerf 15 having a depth up to the junction (see the dotted line portion 19), the light emitting surface was divided into two, and the LED element portions 11 and 12 of different emission colors were separated. [Effects] Light emission of different colors is emitted from each of the LED element portions 11 and 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode which emits light of multiple colors.

[0002]

2. Description of the Related Art A light emitting diode (LED) is, for example, in a resin mold type, as shown in FIG. 3, a cathode lead frame 30, an anode lead frame 31, and an LED chip 32 soldered to an end portion of the frame 30. , An Au wire 33 that connects the chip 32 and the frame 31, and a mold resin 34 that covers these elements.

An LED is a semiconductor having a PN junction,
It emits light when electrons in the N region recombine with holes in the P region. The emission color is determined by the type of semiconductor and the impurities added to each region. At present, LEDs from infrared to blue have been developed and used for various purposes in various devices.

[0004]

By the way, in the manufacture of LEDs, it is general to attach LED chips (pellets) to various stems and then connect Au wires to the chips.
Then, the pellets are placed in a package to make a product. The resulting LED emits monochromatic light, but as a multicolored LED, individual pellets are prepared for each color,
Practical ones that contain pellets of several colors in the same package.

However, to accommodate two or more types of pellets in the same package, a package of a certain size is required, and the LED becomes larger as the number of colors increases. Therefore, an object of the present invention is to provide a multicolor light emitting diode which can obtain multicolor light emission and which does not become large in size.

[0006]

In order to achieve the above object, a multicolor light emitting diode (multicolor LED) of the present invention electrically shields at least two light emitting diode elements which emit different emission colors. It is characterized by being integrated into one pellet. As a result, a multicolor LED pellet can be manufactured in the wafer manufacturing process, and even in the case of multicolor emission, only one pellet needs to be contained in the package, which is smaller than conventional multicolor LEDs Is realized.

As a method of electrically shielding the light emitting diode element, it is illustrated that a kerf is formed up to the PN junction, and the kerf may be formed by dicing, for example.

[0008]

EXAMPLES The multicolor light emitting diode of the present invention will be described below based on examples. FIG. 1 shows a two-color emitting LED pellet 10. This pellet 10 is a red-emitting LED
The element portion 11 and the green light emitting LED element portion 12 are integrated, and one LED element is constituted by the both portions 11 and 12.
A band-shaped kerf 15 that divides the area into two and divides the light emitting surface of the LED element into two is formed. The kerf 15 has a depth that electrically dissociates the PN junction (see the dotted line portion 19). The pellet 10 is a single LED device that emits two colors, but both parts 11 and 12 are completely independent L by the kerf 15.
Functions as an ED element. Furthermore, each LED element part 1
Au wires 11a and 12a are connected to 1 and 12, respectively.

In such a pellet 10, after a semiconductor material is epitaxially grown with a different composition, a kerf 15 is formed up to a PA junction (see a dotted line portion 19) so as to electrically separate the boundary surface of the epitaxial growth layers having different compositions. It can be manufactured by forming. Also, in order to make different emission colors, for example, the two-color (red and green) LEDs of FIG. 1 are used.
In this case, GaAsP may be epitaxially grown on the semiconductor material with a different composition, and a kerf may be formed in the boundary surface of the epitaxial growth layers with different compositions to electrically dissociate the PN junctions of both layers. The thus-formed pellets are put into an appropriate package, for example, a resin mold type as shown in FIG. 3 to be a two-color LED product.
In this two-color LED, red and green may be emitted separately or at the same time. This can be controlled by a circuit provided outside the LED.

FIG. 2 shows a four color LED pellet 20. In this example, one pellet 20 is divided into four triangular LED element parts 2 by strip-shaped grooves 25 and 26 in the diagonal direction which are divided up to the PN junction part (see the dotted line part 29).
1, 22, 23, 24 divided into parts 21-24
The u lines 21a, 22a, 23a and 24a are connected.
The emission color can be changed by changing the composition of the semiconductor material,
Different four colors can be obtained by changing the impurity and the concentration of addition thereof. 4 colors L using this pellet
In the case of an ED, it is possible to emit light in seven primary colors (white to blue) by simultaneously emitting light in four colors or in combining arbitrary colors.

It is needless to say that the above embodiments are merely examples, and the multicolor LED of the present invention is not limited to those shown in these embodiments. For example, in addition to GaAsP, the semiconductor material may be InGaAlP or the like. In the case of GaAsP, it is possible to emit light of two or more colors by partially growing the epitaxial growth layer. Further, the LED element portion divided by the kerf does not have to have the shape shown in the drawing, and can be changed to any shape.

[0012]

As described above, the multicolor LE of the present invention is used.
D is a package in which at least two LED elements emitting different emission colors are electrically shielded and integrated into one pellet, so that the package for storing the pellets is large in spite of multicolor emission. It doesn't. Moreover, the size is not so different from the conventional single-color LED for multiple colors, so that it has a wide range of applications. G.
B. If a corresponding multicolor LED is made, it becomes possible to realize an LED TV or the like.

[Brief description of drawings]

FIG. 1 is a perspective view of a multicolor (two-color) LED pellet according to an embodiment of the present invention.

FIG. 2 is a perspective view of a multicolor (4 color) LED pellet according to another embodiment of the present invention.

FIG. 3 is a partially omitted configuration diagram of a single-color LED according to a conventional example.

[Explanation of symbols]

 10,20 LED pellet 11,12 LED element part 21,22 LED element part 23,24 LED element part 15,25,26 Cut groove

Claims (1)

[Claims] 1. A multicolor light emitting diode, characterized in that at least two light emitting diode elements emitting different colors of light are electrically shielded and integrated into one pellet.