TW201345001A - Light-emitting diode and light distribution module thereof - Google Patents

Abstract

A light distribution module of an LED includes a lens, a reflecting layer and a rough layer in series. The rough layer and the lens are made of transparent material. The reflecting layer includes an adhering surface and a reflecting surface opposite to the adhering surface. The reflecting surface is a smooth curved surface. The rough layer includes an engaging surface and a rough surface opposite to the engaging surface. The engaging surface is and convex curved surface. The engaging surface is engaged with the reflecting surface intimately without interruption. The rough surface is provided with a plurality of rough structures thereon. An rough grade of the rough structure decreases gradually along a direction from a middle portion of the rough layer towards a periphery of the rough layer. The lens includes a light input surface and a light output surface opposite to the light input surface. The light input surface is engaged with the rough surface of the rough layer intimately with out interruption.

Description

Light-emitting diode and its light distribution structure

The present invention relates to a light emitting diode, and more particularly to a light distributing structure of a light emitting diode.

As a highly efficient light source, the light-emitting diode has many characteristics such as environmental protection, power saving, long life and the like, and has been widely used in many fields, such as living lighting and backlight source.

The light-emitting diode of the conventional light-emitting diode generally has an angle of light of 90 degrees to 120 degrees, and the center of the light exiting angle (the light-emitting angle is about 0 to 30 degrees) has a strong light intensity, and the surrounding light intensity is weak, resulting in the entire light-emitting. The light output of the diode is not uniform, which limits its wide application in environments where uniform illumination is required.

In view of the above, it is necessary to provide a light-emitting diode light source having uniform light emission and a light distribution structure thereof.

A light distribution structure of a light-emitting diode, comprising a lens, a reflective layer and a roughened film, the roughened film and the lens are both made of a transparent material, the reflective layer comprises a bonding surface and a reflective surface opposite to the facing surface, the reflecting surface is a smooth curved concave surface, the roughened diaphragm comprises a joint surface and a rough surface opposite to the joint surface, the joint surface is a curved convex surface, The bonding surface has no adhesion to the reflecting surface of the reflective layer, and the rough surface is formed with a rough structure. The roughness of the rough structure gradually decreases from the middle to the edge of the roughened film, and the lens includes a light incident surface. And a light emitting surface opposite to the light incident surface, the light incident surface is combined with the rough surface of the roughened film.

A light-emitting diode includes a base, two electrodes disposed on the base, a light-emitting chip electrically connected to the two electrodes, and a light distribution structure including a lens, a reflective layer, and a roughened film, the roughened film and the lens are both made of a transparent material, the reflective layer comprises a bonding surface and a reflecting surface opposite to the bonding surface, the reflecting surface is a smooth curved shape a concave surface, the roughened film comprises a bonding surface and a rough surface opposite to the bonding surface, the bonding surface is an arc-shaped convex surface, and the bonding surface and the reflecting surface of the reflective layer have no close contact, the rough surface Forming a rough structure, the roughness of the rough structure gradually decreases from a middle portion to an edge of the roughened film, the lens includes a light incident surface and a light emitting surface opposite to the light incident surface, the light incident surface and the light incident surface The rough surface of the roughened film is bonded, and the bonding surface of the reflective layer is attached to the pedestal and insulated from at least one of the electrodes, and the luminescent wafer is located in the middle of the reflective layer.

When the light-emitting diode using the light distribution structure described above is operated, the roughened structure on the roughened film may cause diffuse reflection of light in the lens, since the roughness of the rough structure on the roughened film is from the roughening The middle portion of the diaphragm gradually decreases toward the edge. Therefore, under the action of the roughened diaphragm and the reflective layer, the light that is directed toward the middle of the lens is more dispersed, so that the light intensity of the light-emitting diode is more uniform.

The invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , a light emitting diode 100 is illustrated in a preferred embodiment of the present invention. The light emitting diode 100 includes a base 10 , two electrodes 20 disposed on the base 10 , and the two An illuminating wafer 30 electrically connected to the electrode 20 and a light distributing structure 40 disposed on the illuminating wafer 30.

Referring to FIG. 2, the susceptor 10 is an insulating base made of plastic or other suitable materials such as bismuth (Si), gallium arsenide (GaAs), zinc oxide (ZnO), and indium phosphide (InP). )Wait. The base 10 has a flat shape and includes a first surface 11 and a second surface 12 disposed opposite each other. The two electrodes 20 are separated from one another and each electrode 20 extends from the first surface 11 of the base 10 to the second surface 12.

The material of the luminescent wafer 30 can be selected according to actual illuminating requirements, such as red-emitting GaAsP, yellow-emitting InGaAlP, blue-emitting GaN, green-emitting GaP, and the like. The illuminating chip 30 is located on the side of the first surface 11 of the pedestal 10 and is fixed on one of the electrodes 20, and the two electrical contacts of the illuminating chip 30 are respectively connected to the two electrodes 20 by wire bonding. Electrical connection. In other embodiments, the illuminating wafer 30 can also be electrically connected to the two electrodes 20 in the form of wafer flip-chip.

The light distribution structure 40 includes a reflective layer 41, a roughened film 42 and a lens 43 which are sequentially stacked upward from the susceptor 10. The reflective layer 41 is a metal sheet having a size comparable to that of the base 10 and having a thickness that gradually increases from the middle to the outer edge. A through hole 410 is formed in the middle of the reflective layer 41. The reflective layer 41 includes a bonding surface 411 and a reflecting surface 412 opposite to the bonding surface 411. The bonding surface 411 has a planar shape for attaching the susceptor 10. The reflective layer 41 is insulated from the two electrodes 20 or at least insulated from one of the electrodes 20. The reflective surface 412 is a smooth curved concave surface formed by a stamping or polishing process. The light-emitting chip 30 is leaked through the through hole 410. The reflective surface 412 surrounds the periphery of the light-emitting chip 30 for reflecting the light generated by the light-emitting chip 30. In other embodiments, the reflective layer 41 can also be made of glass or high temperature resistant plastic, and the reflective surface 412 can be formed by one demolding.

Referring to FIG. 3, the roughened film 42 is a transparent sheet made of a high temperature resistant transparent material such as glass, polycarbonate (PC), polyacrylate (PEA) or the like. The thickness of the roughened film 42 gradually decreases from the middle to the edge, and a receiving hole 420 is formed in the middle portion. The roughened film 42 includes a bonding surface 421 and a rough surface 422 opposite the bonding surface 421. The bonding surface 421 is an arcuate convex surface having a shape matching the reflecting surface 412 of the reflective layer 41. The bonding surface 421 and the reflecting surface 412 of the reflective layer 41 are not bonded to each other. A roughness 423 is formed on the rough surface 422, and the roughness 423 is formed by etching or printing, and the roughness of the roughness 423 gradually decreases from the middle to the edge of the roughened film 42. The receiving hole 420 surrounds the periphery of the light emitting chip 30.

In this embodiment, the roughness 423 is a plurality of conical protrusions 4230 protruding from the rough surface, and the protrusions 4230 are arranged around the receiving hole 420. The height and span of the protrusions 4230 are from The middle portion of the roughened film 42 gradually decreases toward the edge. In other embodiments, the roughness 423 may also be a groove whose depth and span gradually decrease from the middle to the edge of the roughened film 42 or other shapes of protrusions or grooves, such as a hemisphere, a ladder Table shape and so on.

The lens 43 is made of a transparent material such as transparent plastic or glass. In this embodiment, the lens 43 is formed on the rough surface 422 of the roughened film 42 by a process such as injection molding using a transparent epoxy resin or the like. The lens 43 is substantially in the shape of a pie having a batwing-like longitudinal section. The lens 43 includes a light incident surface 431 and a light exit surface 432 opposite to the light incident surface 431. The light incident surface 431 is combined with the rough surface 422 of the roughened film 42. The protrusion 4230 on the rough surface 422 of the roughened film 42 extends into the light incident surface 431 of the lens 43 to make the light incident surface 431. A pit 4310 corresponding to the protrusion 4230 is formed thereon. A light chamber 433 is disposed in the middle of the light incident surface 431. The light chamber 433 is in communication with the receiving hole 420 of the roughened film 42, and the inner diameter of the light chamber 433 and the receiving portion of the roughened film 42 are received. The inner diameter of the hole 420 is the same. The light chamber 433 has a circular side wall 4331 and an arched top wall 4332, so that the light chamber 433 has an inverted U-shaped longitudinal section, and the side wall 4331 and the top wall 4332 are both Smooth reflective surface. The light chamber 433 is located directly above the light emitting wafer 30. The light-emitting surface 432 is an outwardly convex curved surface. The middle portion of the light-emitting surface 432 is provided with a funnel-shaped recess 4320, so that the middle portion of the lens 43 is a concave lens structure, and the edge has a convex lens structure. The edge portion of the 432 faces the rough surface 422 of the roughened film 42, and the recess 4320 of the light exit surface 432 faces the light chamber 433 on the light incident surface 431.

When the light-emitting diode 100 is in operation, part of the light emitted by the light-emitting chip 30 directly enters the lens 43 and the other portion enters the roughened film 42 by the inner wall 4201 of the roughened film 42 and is further The reflecting surface 412 of the reflective layer 41 at the bonding surface 421 of the roughened film 42 is reflected into the lens 43. A portion of the light entering the lens 43 is directly emitted by the light exit surface 432 of the lens 43, and the other portion is reflected by the light exit surface 432 onto the rough surface 422 of the roughened film 42 and is reflected onto the rough surface 422. A portion of the light is diffusely reflected by the roughness 423 on the rough surface 422 into the lens 43, and another portion enters the roughened film 42 and is again reflected by the reflective surface 412 of the reflective layer 41 into the lens 43. Thus, after a plurality of reciprocations, the roughened structure 423 on the rough surface 422 of the roughened film 42 distributes the light multiple times, so that the light exiting surface 432 of the lens 43 can emit relatively uniform light.

Secondly, since the illuminating wafer 30 is a point source and is located in the middle of the lens 43, the illuminating wafer 30 is directed to the middle of the lens 43. In the present invention, the roughened structure 42 of the roughened film 42 is 423. The roughness is gradually reduced from the middle to the edge of the roughened film 42. The coarser the structure, the more the light can be diffusely reflected. Therefore, the rough structure 423 in the middle of the roughened film 42 can make the lens 43 The light emitted from the center is more dispersed, which is advantageous for making the light emitted from the lens 43 more uniform. At the same time, the reflective surface 412 of the reflective layer 41 is an arc-shaped concave surface, and the light incident on the reflective surface 412 can be reflected above the middle of the reflective layer 41, and the rough structure 423 having a relatively large roughness is located on the reflective layer. Above the middle of the reflecting surface 412 of 41, more light can be diffusely reflected.

The light chamber 433 disposed in the middle of the light incident surface 431 of the lens 43 separates the light emitting chip 30 from the lens 43 to prevent the heat generated by the light emitting chip 30 from damaging the lens 43 while the sidewall 4331 of the light chamber 433 and The top wall 4332 can distribute a portion of the light emitted from the illuminating wafer 30 into the roughened film 42, thereby reducing the light emitted from the middle portion of the lens 43, thereby facilitating more uniform light emitted by the lens 43.

In addition, in the middle of the light-emitting surface 432 of the lens 43 of the present invention, a funnel-shaped recess 4320 is provided, so that the middle portion of the lens 43 is a concave lens structure, and the edge has a convex lens structure, and the structure of the concave lens is favorable for light. The divergence, while the structure of the convex lens facilitates the accumulation of light, is also advantageous in that the light emitted from the light exit surface 432 of the lens 43 tends to be uniform.

In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, such changes in accordance with the spirit of the present invention should be included in the scope of the present invention.

100. . . Light-emitting diode

10. . . Pedestal

11. . . First surface

12. . . Second surface

20. . . electrode

30. . . Light emitting chip

40. . . Light distribution structure

41. . . Reflective layer

410. . . Through hole

411. . . Fitting surface

412. . . Reflective surface

42. . . Roughened diaphragm

420. . . Receiving hole

4201. . . Inner wall

421. . . Joint surface

422. . . Rough surface

423. . . Rough structure

4230. . . Depression

43. . . lens

431. . . Glossy surface

4310. . . Pit

432. . . Glossy surface

4320. . . Bulge

433. . . Light room

4331. . . Side wall

4332. . . Top wall

1 is a schematic view showing the assembled structure of a light-emitting diode according to a preferred embodiment of the present invention.

FIG. 2 is a schematic exploded view of the light emitting diode of FIG. 1. FIG.

Figure 3 is a plan view of the roughened film of Figure 2.

10. . . Pedestal

11. . . First surface

12. . . Second surface

20. . . electrode

30. . . Light emitting chip

40. . . Light distribution structure

41. . . Reflective layer

410. . . Through hole

411. . . Fitting surface

412. . . Reflective surface

42. . . Roughened diaphragm

420. . . Receiving hole

4201. . . Inner wall

421. . . Joint surface

422. . . Rough surface

423. . . Rough structure

4230. . . Depression

43. . . lens

431. . . Glossy surface

4310. . . Pit

432. . . Glossy surface

4320. . . Bulge

433. . . Light room

4331. . . Side wall

4332. . . Top wall

Claims (10)

A light distribution structure of a light-emitting diode, comprising a lens, the improvement comprising: further comprising a reflective layer and a roughened film, the roughened film and the lens are both made of a transparent material, the reflective layer comprises a a bonding surface and a reflecting surface opposite to the bonding surface, the reflecting surface is a smooth curved concave surface, the roughening film comprises a bonding surface and a rough surface opposite to the bonding surface, the bonding surface is An arc-shaped convex surface, the bonding surface and the reflecting surface of the reflective layer have no close contact, and the rough surface is formed with a rough structure, and the roughness of the rough structure gradually decreases from the middle to the edge of the roughened film, The lens includes a light incident surface and a light emitting surface opposite to the light incident surface, and the light incident surface is combined with the rough surface of the roughened film. The light distribution structure of the light-emitting diode according to claim 1, wherein the thickness of the reflective layer gradually increases from the central portion to the outer edge, and a through hole is formed in the middle portion of the reflective layer. The light distribution structure of the light-emitting diode according to the first aspect of the invention, wherein the thickness of the roughened film gradually decreases from the central portion to the edge, and a receiving hole is formed in the middle portion. The light distribution structure of the light-emitting diode according to the third aspect of the invention, wherein a light chamber is recessed in a middle portion of the light-incident surface, and the light chamber communicates with a receiving hole on the roughened film, the light chamber The utility model has an inverted U-shaped longitudinal section, the light chamber has a circular side wall and an arched top wall, and the side wall and the top wall are smooth reflective surfaces. The light distribution structure of the light-emitting diode according to claim 1, wherein the roughness is a plurality of protrusions protruding from the rough surface, the height and span of the protrusion being from the middle of the roughened film Gradually decrease toward the edge. The light distribution structure of the light-emitting diode according to claim 5, wherein the protrusion is any one of a cone shape, a hemispherical shape and a terrace shape. The light distribution structure of the light-emitting diode according to claim 1, wherein the roughness is a plurality of grooves formed on the rough surface, the groove depth and the span from the middle of the roughened film Gradually decrease toward the edge. The light distribution structure of the light-emitting diode according to claim 7, wherein the groove is any one of a cone shape, a hemisphere shape and a terrace shape. The light distribution structure of the light-emitting diode according to claim 1, wherein the lens has a batwing-shaped longitudinal section, the light-emitting surface is an outwardly convex curved surface, and a funnel is provided in a middle portion of the light-emitting surface. Shaped depression. An illuminating diode includes a pedestal, two electrodes disposed on the pedestal, and a luminescent wafer electrically connected to the pedestal. The improvement is as follows: further comprising any one of claims 1 to 9 In a light distribution structure, the bonding surface of the reflective layer is attached to the pedestal and insulated from at least one of the electrodes, and the luminescent wafer is located in the middle of the reflective layer.