Package structure for light emitting diode and applications of the same

#The present invention is generally related to light emitting diodes, and, more particularly, is related to one or more package structures for light emitting diodes and applications of the same.

#Because of the advantage of small size, low power consumption and long life span, light emitting diodes (hereinafter “LEDs”) are widely used in household appliances, computer peripherals, communication products, traffic lights and car lamps, and other types of applications. An LED is a junction diode formed by a p-n junction having a direct junction between a p-type layer and an n-type layer or a double-hetero junction having an active layer sandwiched between a p-type layer and an n-type layer, on a heavily doped semiconductor compound base. The LED has a pair of conductive leads (or pins) connected to the p-type layer and the n-type layer, respectively, for electrical connection with a power source. For such an LED, light can be emitted by the p-n junction or the active layer by applying a forward voltage to between the p-type layer and the n-type layer.

#Usually, an LED emits light only in a single color. As development of communication products such as mobile phones and liquid crystal displays that employ white light for illumination liquid crystal molecules thereof, there is a need to develop colorful LED panels to display colorful images and/or to provide a white light source of LEDs. A white light source is a combination of red, green, and blue LEDs whose combined light forms white light. Therefore, it is necessary to develop an LED package assembly with three LEDs, generally a red LED, a blue LED, and a green LED.

#The accompanying drawings illustrate one or more embodiments of the invention and, together with the written description, serve to explain the principles of the invention. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment, and wherein:

#FIG. 1 shows schematically a perspective view of an optical element according to one embodiment of the present invention.

#FIG. 2a shows schematically a cross-sectional view of an LED package structure according to one embodiment of the present invention.

#The present invention is more particularly described in the following examples that are intended as illustrative only since numerous modifications and variations therein will be apparent to those skilled in the art. Various embodiments of the invention are now described in detail. Referring to the drawings, like numbers indicate like components throughout the views. As used in the description herein and throughout the claims that follow, the meaning of “a”, “an”, and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.

#The description will be made as to the embodiments of the present invention in conjunction with the accompanying drawings of FIGS. 1-4. In accordance with the purposes of this invention, as embodied and broadly described herein, this invention, in one aspect, relates to an LED package structure having at least one or more optical elements.

#Referring now to FIG. 1, an optical element 100 for an LED package structure is shown according to one embodiment of the present invention. The optical element 100 has a lens 110 having a body portion 118 with a first surface 112, a second surface 114, a third surface 116, and a fourth surface 117 that intersects with the first surface 112, the second surface 114, and the third surface 116, and an LED chip 150 having a first conductive lead 151 and a second conductive lead 152. The LED chip 150 is embedded in the body portion 118 of the lens 110 such that the first conductive lead 151 and the second conductive lead 152 of the LED chip 150 extend out of the body portion 118 from one of the third surface 116 and the fourth surface 117 of the lens 110. The first surface 112 and the second surface 114 of the lens 110 are capable of refracting light emitted from the LED chip 150. The body portion 118 of the lens 110 has a cross-sectional shape of a sector. The body portion 118 of the lens 110 can also be formed to have a cross-sectional shape of a closed loop, a triangle, a quadrilateral or a polygon. The first surface 112 and the second surface 114 the lens 110 forms a cross line 115 and define an angle θ that is not less than 90° and not greater than 180°. As shown in FIG. 1, the angle θ is about 120°. The lens 110 is made of a transparent material including glass, plastic, resin or the like. As shown in FIG. 1, the body portion 118 further has a fifth surface 119 that intersects with the first surface 112, the second surface 114 and the fourth surface 117.