KR100611922B1 - Lens for use in light emitting device and package using the lens - Google Patents

Abstract

The present invention relates to a lens for a light emitting element and a package using the same, wherein the lens for a light emitting element has a hollow portion capable of positioning a light emitting element from which light is emitted; It consists of a refractive surface that can be emitted to the outside by refracting the light emitted from the light emitting element; Concave groove is formed in the upper portion.

Therefore, the present invention can be emitted to the light having a uniform intensity to the top by refracting the light traveling to the upper portion, there is an effect that can reduce the thickness of the complex assembly process and panel when applied to the display panel.

Luminous, refraction, lens, uniform, top, groove

Description

Lens for light emitting device and package using the same {Lens for use in light emitting device and package using the lens}

1 is a view illustrating a path of light in a lens of a side light emitting diode package according to the related art.

FIG. 2 is a schematic perspective view of the side light emitting diode package of FIG. 1.

3 is a light emission distribution diagram of a side light emitting diode package according to the related art

4 is a cross-sectional view of a side light emitting diode package mounted on a printed circuit board according to the related art.

5 is a schematic cross-sectional view using a side light emitting diode according to the prior art as a backlight unit of a liquid crystal display;

6 is a cross-sectional view illustrating a path through which light travels through the lens for a light emitting device according to the present invention.

7 is a cross-sectional view illustrating a path through which light travels through the lens for a light emitting device according to the present invention.

8 is a cross-sectional view illustrating a path through which light travels in a state where a reflective structure is mounted on a guide extension portion of a lens for a light emitting device according to the present invention.

9 is a perspective view of a lens for a light emitting device according to the present invention;

10 is a cross-sectional view illustrating a path in which light travels through a lens for a light emitting element having a plurality of concave grooves formed thereon according to the present invention.

FIG. 11 is a perspective view of a lens for a light emitting element shown in FIG. 10; FIG.

12 is a schematic cross-sectional view of a light emitting device package equipped with a lens for a light emitting device according to the present invention.

Figure 13 is a schematic cross-sectional view showing a state in which the protrusion of the light emitting device package is inserted into the guide extension portion of the lens for a light emitting device according to the present invention.

14 is a schematic cross-sectional view of a package in which a lens for a light emitting device according to the present invention is mounted on a support unit;

15 is a schematic cross-sectional view of a package in which a lens shape for a light emitting element is formed in a molding part according to the present invention.

<Description of the symbols for the main parts of the drawings>

100 light emitting element lens 101 hollow part

102,131,132,133,134,271: Groove 105,106: Extension part

107: guide extension portion 110: light emitting element

120,270: reflective structure 150: detector

200: package body 210: heat slug

220: light emitting element 230: lead

240 wire 250 molding part

260: protrusion

The present invention relates to a lens for a light emitting device and a package using the same, and more particularly to a light emitting device lens and a package using the same that can be emitted to the light having a uniform intensity to the top by refracting the light traveling upwards will be.

The optical form of a conventional general light emitting diode is composed of a dome type lens, and the light emission distribution is also distributed within a predetermined region with respect to the central axis.

When using such a light emitting diode to replace a liquid crystal display backlight unit, which has been studied a lot recently, there are many limitations in obtaining a uniform light characteristic due to the light emitting characteristics of the light emitting diode. Receive.

In other words, in order to uniformly synthesize white light emitted from the light emitting diode, a considerable distance is required.

This, in turn, relates to the thickness of the liquid crystal display system, which is a detrimental advantage on thinner systems.

1 is a view illustrating a path of light in a lens of a side light emitting diode package according to the prior art. First, the light emitting diode 10 is located inside a dome-shaped lens 20, which is a dome-shaped lens. The upper portion 20 has a conical groove 21 formed at an upper portion thereof, and a V-shaped groove 22 is formed at a side surface thereof.

When the light emitted from the light emitting diode 10 comes into contact with the conical groove 21 surface of the lens 20, the conical groove 21 is inclined so that the light is reflected to the side of the lens. Emitted by A 'path.

When light comes into contact with the V-shaped groove 22 on the side of the lens 20, the light passes through the lens 20 and is emitted to another path 'B' which is the side of the lens.

Therefore, the side light emitting diode according to the related art emits light emitted from the light emitting diode 10 to the side by using a lens.

On the other hand, the lens 20 is formed by injection molding, the area corresponding to the vertex 22a of the V-shaped groove 22 formed on the side of the lens 20 is a fine unit (for example, in advance In a meter or less unit), the light of the light emitting diode 10 is emitted to the upper portion of the lens 10 without being emitted to the side of the lens 10 in this region.

For this reason, in the conventional lens structure, the light emitted to the upper part of the lens exists, and the light quantity will be described in the light emission distribution which will be described later.

FIG. 2 is a schematic perspective view of the side light emitting diode package of FIG. 1, wherein the light emitting diode is bonded to a slug, and leads 31 and 32 are positioned on the side of the slug and electrically bonded to the light emitting diode. have.

In addition, the light emitting diode and the slug are molded by the molding means 40 so that the light emitting surfaces and the leads 31 and 32 of the light emitting diode are exposed to the outside, and the lens as shown in FIG. 1 surrounding the light emitting diode. 20 is bonded to the molding means.

3 is a light emission distribution diagram of a side light emitting diode package according to the prior art, as shown in the 'a' and 'b' of the distribution diagram, 92% to 95% of the light is emitted to the side of the package, 5% as the center of the package ~ 8% of light is emitted.

That is, referring to FIG. 1, most of the light is emitted to the side of the lens, but part of the light is emitted to the upper surface of the lens.

Therefore, such a side light emitting diode package cannot realize perfect side light emission, so that when used as a light source of a display, part of the light emitting diode is emitted from the center of the side light emitting diode package, which makes it difficult to make the flat light source uniform. This happens.

That is, a phenomenon in which light is emitted at the center of the side light emitting diode package may cause a hot spot phenomenon in which spots are generated at the center of the pixel displayed on the display, thereby adversely affecting the image quality of the display. .

4 is a cross-sectional view of a side light emitting diode package according to the related art mounted on a printed circuit board, and a plurality of side light emitting diode packages 50 are mounted on the printed circuit board 60.

FIG. 5 is a schematic cross-sectional view using a side light emitting diode according to the prior art as a backlight unit of a liquid crystal display. In order to solve the problem that light is emitted at the center of the side light emitting diode package described above, a backlight of a liquid crystal display is shown. The unit used a hot spot barrier.

That is, the backlight unit 90 of the liquid crystal display has a hot spot preventing plate 80 on top of each of the plurality of side light emitting diode packages 50 mounted on the printed circuit board 60. The light guide plate 85 is disposed on the hot spot prevention plate 80, and the liquid crystal display 95 is positioned on the upper part spaced apart from the light guide plate 85, thereby forming the backlight unit 90 and the liquid crystal display 95. Is assembled.

The backlight unit 90 configured as described above has to perform an assembly process in which a hot spot prevention plate 80 called a diverter is placed on the plurality of side light emitting diode packages 50. have.

In addition, during the assembling process, when misalignment occurs in the alignment of the hot spot prevention plate 80 on the plurality of side light emitting diode packages 50, spots similar to hot spots are generated on the screen of the final display.

In addition, the thickness of the display panel is increased by the thickness of the hot spot prevention plate 80.

In order to solve the problems as described above, an object of the present invention is to provide a lens for a light emitting device lens and a package using the same, which can be refracted toward the upper portion and emitted as light having a uniform intensity. .

A first preferred aspect for achieving the above objects of the present invention is

A hollow portion capable of positioning the light emitting element from which light is emitted is formed therein;

It consists of a refractive surface that can be emitted to the outside by refracting the light emitted from the light emitting element;

A lens for a light emitting element having a concave groove formed thereon is provided.

A second preferred aspect for achieving the above objects of the present invention is

With heat slugs;

A light emitting device bonded on the heat slug;

Leads electrically connected to the light emitting device;

A molding part surrounding a portion of the light emitting element and the leads and exposing a lower portion of the heat slug;

A light emitting device lens comprising a lens that is refracted to the light emitted from the light emitting device to be emitted to the outside, a concave groove is formed on the upper portion, the lens is fixed to the molding portion Packages are provided.

A third preferred aspect for achieving the above objects of the present invention is

With heat slugs;

A light emitting device bonded on the heat slug;

Leads electrically connected to the light emitting device;

A molding part surrounding a portion of the light emitting device and the leads, exposing a lower portion of the heat slug, and having a protrusion having a lens shape for the light emitting device thereon;

The lens for a light emitting element comprises a refractive surface that can be emitted to the outside by refracting the light emitted from the light emitting element; Provided is a package using a lens for a light emitting device having a structure in which at least one concave groove is formed on the top.

A fourth preferred aspect for achieving the above objects of the present invention is

A support;

A ring-shaped reflective structure adhered to the upper portion of the support;

A light emitting device bonded to an upper portion of the support exposed in the ring-shaped reflective structure;

A refractive surface bonded to an upper portion of the support outside the reflective structure and capable of refracting the light emitted from the light emitting device to be emitted to the outside; Provided is a package using a lens for a light emitting element comprising a lens for a light emitting element having at least one concave groove formed thereon.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

6 is a cross-sectional view illustrating a path through which light passes through the lens for a light emitting device according to the present invention. First, the light emitting device lens 100 according to the present invention positions the light emitting device 110 through which light is emitted. A hollow portion 101 is formed therein; It consists of a surface that can be emitted to the outside by refracting the light emitted from the light emitting device (110); Concave groove 102 is formed in the upper portion.

Here, the light emitting device lens 100 is made in a convex cap shape; It is preferable that the concave groove 102 is formed in the upper region located on the central axis P of the cap shape.

As shown in FIG. 6, in the light emitting device lens 100, the light emitting device 110 is positioned inside the lens 100, and the light emitted from the light emitting device 110 is transferred to the lens 100. It is refracted by and exits to the outside.

In this case, the concave groove 102 formed in the upper portion of the lens 100 changes the shape of the upper portion of the lens 100 and refracts the light traveling upward from the light emitting device 110.

On the other hand, in general, since the light emitting device has a large light intensity traveling upwards, the light emitting device may be utilized in a back light unit by mounting a structure by changing a path so that light is emitted to the side. The light traveling in the upper portion may be refracted to make the light intensity detected by the upper detecting unit 150 more uniform.

Therefore, as shown in FIG. 6, the light emitted from the light emitting element 110 inside the lens 100 is refracted by the lens 100 and spreads to the side surface, and thus a trajectory is uniformly incident on the detection unit 150. Is showing.

7 is a cross-sectional view illustrating a path through which light travels through the lens for a light emitting device according to the present invention, which is on the central axis P of the lens 100 for a light emitting device, When the position at which light is emitted from the inside is referred to as 'O', the light emitted by the path up to 80 degrees from the central axis P is refracted by the light emitting device lens 100 and proceeds upward.

However, the light emitted by the path from 80 degrees to 90 degrees does not proceed upward even when refracted by the lens 100 for the light emitting element, and proceeds toward the lateral direction of the lens 100 for the light emitting element.

FIG. 8 is a cross-sectional view illustrating a path through which light travels in a state in which a reflective structure is mounted on a guide extension of a lens for a light emitting device according to the present invention. The hollow portion of is in communication with the outside, and the end of the open portion is connected to the guide extension portion 107.

That is, the guide extension part including the first extension part 105 extending horizontally to the end of the lens 100 and the second extension part 106 extending perpendicular to the first extension part 105 ( 107 is formed in the lens 100 for light emitting elements.

The guide extension portion 107 is formed to easily mount the light emitting element lens to the light emitting element package.

As shown in FIG. 8, a ring-shaped reflective structure 120 having an inclined surface is mounted inside the guide extension part 107 to thereby direct light emitted from the side surface of the light emitting device. I can deliver it.

9 is a perspective view of a light emitting device lens according to the present invention, a concave groove 102 is formed in the upper portion of the light emitting device lens 100, the light emitting device lens 100 to bend the light therein In order to form a curved surface.

In this case, the light emitting device lens 100 may be formed by properly arranging a curved surface or an inclined surface so that the light therein may be transmitted upward with a uniform intensity.

10 is a cross-sectional view illustrating a path through which light passes through a lens for a light emitting device having a plurality of concave grooves formed thereon according to the present invention. The light emitting device lens 100 of the present invention is spaced apart from each other. By forming a plurality of concave grooves (102, 131, 132), it may be designed to transmit light of uniform intensity to the lens 100.

FIG. 11 is a perspective view of the lens for the light emitting device illustrated in FIG. 10, wherein a plurality of concave grooves 102, 131, 132, 133, and 134 are formed on the light emitting device lens 100, and the light emitting device lens 100 has a central axis. It is preferable to be spaced apart from each other at the same interval.

12 is a schematic cross-sectional view of a light emitting device package equipped with a lens for a light emitting device according to the present invention, and the lens 100 is adhered to an upper portion of the package body 200 in which the light emitting device is located.

At this time, the light emitting device package body 200 and the heat slug 210; A light emitting device 220 bonded to the heat slug 210; Leads 230 bonded to wires 240 to the light emitting device 230; The light emitting device 220, the wire 240, and a part of the leads 230 may be formed, and the molding part 250 may expose the lower portion of the heat slug 210.

FIG. 13 is a schematic cross-sectional view illustrating a state in which a protrusion of a light emitting device package is inserted into a guide extension portion of a lens for a light emitting device according to the present invention. The light emitting device lens having the aforementioned guide extension part 107 is shown in FIG. A light emitting device package body 200 having a protrusion 100 and a protrusion 260 thereon is prepared.

Thereafter, the protrusion 260 of the upper part of the light emitting device package body 200 is inserted into the guide extension part 107 of the light emitting device lens 100.

At this time, the protruding portion 260 of the light emitting device package body 200 and the guide extension portion 107 of the lens 100 for light emitting device may be bonded by an adhesive means.

FIG. 14 is a schematic cross-sectional view of a package in which a lens for a light emitting device according to the present invention is mounted on a support unit. First, a ring-shaped reflective structure 270 is adhered to an upper portion of the support unit 300, and the ring-shaped reflective structure ( The light emitting device 210 is bonded to the upper portion of the support 300 exposed inside the 270, and the light emitting device lens 100 is bonded to the upper portion of the support 300 outside the reflective structure 270.

In this way, the formed package is emitted from the side of the light emitting device 210 is reflected by the reflective structure 270 is transmitted to the upper to prevent the light loss.

In the above description of FIG. 7, since light emitted from the light emitting device in a path of 80 degrees to 90 degrees does not proceed upward even when refracted by the lens for the light emitting device, the light proceeds toward the side of the light emitting device lens. The reflective structure 270 may emit light traveling upward in the lateral direction to reduce light loss.

That is, the reflective structure 270 has an inclined surface that reflects the light emitted in a path of 80 degrees to 90 degrees from the central axis P of the light emitting device lens 100 and proceeds to the upper portion of the lens.

15 is a schematic cross-sectional view of a package in which a lens shape for a light emitting device is formed in a molding part according to the present invention, wherein the light emitting device package includes a heat slug 210; A light emitting device 220 bonded to the heat slug 210; Leads 230 bonded to the light emitting device 230 and wires 240; A molding part 250 surrounding a portion of the light emitting device 220, the wire 240, and the leads 230, exposing a lower portion of the heat slug 210, and having a protrusion having a lens shape for the light emitting device thereon. It is composed of

Here, the light emitting element lens, as described above, consists of a surface that can be emitted to the outside by refracting the light emitted from the light emitting element 220; It has a structure in which the recessed groove 271 is formed in the upper part.

As described above, in the side light emitting package according to the prior art, the light is emitted to the side and applied to the liquid crystal display of the display, but a complex assembly process such as placing a hot spot preventing plate called a diver should be performed. The thickness of the display panel is increased by the thickness of the hot spot prevention plate.

Therefore, the present invention can be emitted to the light having a uniform intensity to the top by refracting the light traveling to the upper portion, there is an effect that can reduce the thickness of the complex assembly process and panel when applied to the display panel.

Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (13)

A hollow portion capable of positioning the light emitting element from which light is emitted is formed therein; It consists of a refractive surface that can be emitted to the outside by refracting the light emitted from the light emitting element; A light emitting element lens having a concave groove formed in the upper portion. The method of claim 1, The refractive surface is, Made into a convex Cap shape; A concave groove is formed in the upper region located on the central axis (P) of the cap. The method of claim 1, The refractive surface is, Made into a convex Cap shape; The light emitting device lens, characterized in that a plurality of concave grooves are formed in the cap upper region. The method of claim 2 or 3, A part of the cap is open so that the inner hollow part communicates with the outside; The end of the open part is connected to the extension for the guide, The guide extension part includes a first extension part extending horizontally to the end portion, and a second extension part extending perpendicularly to the first extension part. The method of claim 4, wherein In the guide extension portion, A lens for a light emitting element, characterized in that a ring-shaped reflective structure is further provided with an inclined surface. The method of claim 2 or 3, The refractive surface is, A light emitting element lens comprising a curved surface or a mixed surface of a curved surface and an inclined surface. With heat slugs; A light emitting device bonded on the heat slug; Leads electrically connected to the light emitting device; A molding part surrounding a portion of the light emitting element and the leads and exposing a lower portion of the heat slug; A light emitting device lens comprising a lens that is refracted to the light emitted from the light emitting device to be emitted to the outside, a concave groove is formed on the upper portion, the lens is fixed to the molding portion Package using. The method of claim 7, wherein The refractive surface of the lens, Made into a convex Cap shape; A package using a lens for a light emitting element, characterized in that the concave groove is formed in the upper region located on the central axis (P) of the cap. The method of claim 8, The protrusion is further formed on the upper part of the molding part, A part of the cap is open so that the end of the open part is connected to the extension for the guide, The guide extension portion includes a first extension portion extending horizontally to the end portion, and a second extension portion extending perpendicularly to the first extension portion. The protrusion of the molding part is inserted into the guide extension part of the lens is fixed to the package using a light emitting element. With heat slugs; A light emitting device bonded on the heat slug; Leads electrically connected to the light emitting device; A molding part surrounding a portion of the light emitting device and the leads, exposing a lower portion of the heat slug, and having a protrusion having a lens shape for the light emitting device thereon; The lens for a light emitting element comprises a refractive surface that can be emitted to the outside by refracting the light emitted from the light emitting element; A package using a lens for a light emitting element having a structure in which at least one concave groove is formed on the top. A support; A ring-shaped reflective structure adhered to the upper portion of the support; A light emitting device bonded to an upper portion of the support exposed in the ring-shaped reflective structure; A refractive surface bonded to an upper portion of the support outside the reflective structure and capable of refracting the light emitted from the light emitting device to be emitted to the outside; A package using a lens for a light emitting element, comprising a lens for a light emitting element having at least one concave groove formed thereon. The method of claim 11, The reflective structure, A package using a lens for a light emitting element, characterized in that it has an inclined surface that reflects the light emitted in a path of 80 to 90 degrees from the central axis (P) of the lens for the light emitting element and proceeds to the upper portion of the lens. The method according to any one of claims 7 to 12, The refractive surface is, A package using a lens for a light emitting element, characterized in that formed of a curved surface or a mixed surface of a curved surface and an inclined surface.

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