KR101346800B1 - Side view light emitting device and array comprising the same - Google Patents

Abstract

The present invention provides a side surface package body having a bottom surface is a mounting surface, the opening is formed on one side perpendicular to the bottom surface, a light emitting diode chip installed in the opening to emit light in the side direction of the package body, It is formed of a transparent resin to cover the light emitting diode chip, the reflecting portion for reflecting the light emitted from the light emitting diode chip therein, and protruding formed on both sides of the reflecting portion to reflect the light emitted from the light emitting diode chip opening It provides a side light emitting device comprising a lens having an inclined portion to emit to the front side of the.

Light Emitting Diode, Total Reflection Part, Total Reflection Surface, Side Forward, Light Amount, Array, LCD

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an array including a side light emitting element and a side light emitting element,

1 is a schematic perspective view showing a side light emitting device according to an embodiment of the present invention.

Figure 2 is a plan sectional view showing a side light emitting device according to an embodiment of the present invention.

3 is a conceptual view for explaining the operation of the lens of the side light emitting device according to an embodiment of the present invention.

4 is a diagram illustrating an array of side light emitting devices according to an embodiment of the present invention.

5 and 6 are graphs showing optical characteristics of the side light emitting device according to the embodiment of the present invention.

<Code Description of Main Parts of Drawing>

10: package body 20: light emitting diode chip

30: leadframe 32a, 32b: internal lead

34a, 34b: external lead 40: lens

42: inclined portions 42a, 42b: first and second inclined surfaces

43: reflector

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a side light emitting element, and more particularly, to a side light emitting element having a structure capable of increasing the amount of light toward a side and an array comprising such side light emitting elements.

A light emitting element including a package body and a light emitting diode chip provided in the package body is known. Particularly, a side light emitting element that emits light in a lateral direction is widely used as a backlight light source in an LCD or the like. The side light emitting element is a mounting surface on which a bottom surface is mounted to an arbitrary substrate or a base, and a light emitting diode chip is provided on a side surface perpendicular to the bottom surface to emit light in a lateral direction.

The above-described side light emitting device can form an array together with a plurality of other side light emitting devices. At this time, when the side light emitting elements emitting red, green, and blue light (R, G, B) are arranged in order, white light suitable for a backlight of an LCD or the like can be obtained by color mixing of R, G,

However, in a conventional light-emitting element array that obtains white light by using red, green, and blue side light emitting elements, the light intensity (or light amount) in a part of the side front light side of the side light emitting element is small, There is a problem in that the color mixing of the color filters is not properly performed. This is due to the fact that the conventional side light emitting device has a directivity angle range of approximately 120 degrees, and the light intensity is greatly reduced in some lateral regions within the directivity angle range. As described above, the color reproducibility and / or the color sensitivity are greatly deteriorated in an area where color mixing is not appropriately performed. For this reason, there is a need in the art for a side-emitting device that can increase the amount of light relatively laterally.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a side light emitting device capable of increasing the amount of light toward the front side of a light emitting diode and easily adjusting the amount of light forward of the light emitting diode through a lens design.

Another object of the present invention is to provide an array of light emitting devices for obtaining white light using side light emitting elements emitting red, green and blue light, To obtain illumination of white light with improved color reproducibility and color sensitivity.

According to one aspect of the present invention for achieving this technical problem, the bottom surface is a mounting surface, the side surface package body having an opening formed on one side perpendicular to the bottom surface, and installed in the opening of the package body A light emitting diode chip emitting light in a lateral direction, a transparent resin covering the light emitting diode chip, a reflecting portion reflecting light emitted from the light emitting diode chip therein, and protruding from both sides of the reflecting portion; Provided is a side light emitting device including a lens having an inclined portion that reflects light emitted from the light emitting diode chip and emits it toward the front side of the opening.

Preferably, the reflector may be formed in the center of the opening and include a reflective film coated with aluminum on the transparent resin.

Preferably, the inclined portion may include a first inclined surface and a second inclined surface that extend on both sides of the reflecting portion.

Preferably, the first inclined surface and the second inclined surface may be formed in a plane, and the main light emitting surfaces on both sides of the first inclined surface and the second inclined surface may be formed in a curved surface.

According to another aspect of the present invention, in the light emitting device array in which the side light emitting devices emitting red, green, and blue light, respectively, are arranged adjacently to obtain white light by color mixing of the light, each of the side light emitting devices has a bottom surface. The side surface package body which is the mounting surface and has an opening formed at one side perpendicular to the bottom surface thereof, a light emitting diode chip installed in the opening and emitting light toward the side surface of the package body, and the light emitting diode chip. It is formed of a transparent resin so as to cover, the reflection portion for reflecting the light emitted from the light emitting diode chip therein, and is formed protruding on both sides of the reflecting portion to reflect the light emitted from the light emitting diode chip is emitted to the front side of the opening A light emitting device array including a lens having an inclined portion is provided.

Preferably, the inclined portion includes first and second inclined totally inclined surfaces extending from both sides of the reflecting portion, and the reflection characteristic values of the first and second inclined surfaces may be used for color mixing control of the light.

Preferably, the reflection characteristic values of the first and second inclined surfaces may be inclined or flat.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view illustrating a side light emitting device according to an embodiment of the present invention, and FIG. 2 is a plan sectional view illustrating a side light emitting device according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, the side light emitting device 1 according to the present embodiment includes a package body 10 and a lens 40. The package body 10 has a mounting surface on which the bottom surface 12 is mounted to an external substrate or an optional base 2. [ An opening 15 in which the light emitting diode chip 20 is installed is formed on one side 14 of the package body 10 perpendicular to the bottom surface 12. The lens 40 is formed, for example, by a molding process using a resin such as epoxy or silicone, and is provided to cover the light emitting diode chip 20 in the opening 15. In the middle portion of the light emitting surface (that is, the light emitting surface) of the lens 40, a reflector 43 for blocking the light emitted to the outside by reflecting the light emitted from the LED chip 20 to the inside, and the reflection The inclined portion 42 is formed so as to protrude on both sides of the portion 43 to incline most of the light emitted from the light emitting diode chip 20 to its front side to increase the amount of light emitted to the side front. Is formed. The characteristic configuration of the inclined portion 42 will be described later in more detail.

On the other hand, the package body 10 is provided with a lead frame 30 for applying power to the light emitting diode chip 20. In the embodiment of the present invention, the lead frame 30 includes first and second inner leads 32a and 32b (shown in FIG. 2) spaced apart from each other and located inside the package body 10, And first and second outer leads 34a and 34b (shown in FIG. 1) extending to the outside of the package body 10 integrally with the first and second inner leads 32a and 32b. The light emitting diode chip 20 is mounted on the first inner lead 32a and the second inner lead 32a and the light emitting diode chip 20 are connected to each other by the bonding wire w. The first and second outer leads 34a and 34b extend to the bottom surface 12 as a mounting surface of the package body 10 and are electrically connected to external electrical contacts on the bottom surface 12. [ do.

Looking at the structure of the above-described lens 40 in more detail, the lens 40 is partially filled in the opening 15 of the package body 10 to cover the light emitting diode chip 20, the other part of the opening ( 15 is protruded to the outside to form a light emitting surface for emitting (or emitting) light generated from the light emitting diode chip 20 on its protruding surface.

At the center of the light emitting surface of the lens 40, a reflector 43 is formed to block the light emitted from the center of the light emitting device by reflecting all the light emitted from the light emitting diode chip 20 through the reflective film. The reflective portion 43 is formed by filling the surface of the opening 15 with a transparent resin to form a flat surface, and then coating the aluminum to form a reflective film. Therefore, the light emitted from the light emitting diode chip 20 is reflected by the aluminum reflection film to the inside of the transparent resin, and the light emission to the outside is blocked. On both sides of the reflecting portion 43, an inclined portion 42 is formed so as to project obliquely. The inclined portion 42 is composed of first and second inclined surfaces 42a and 42b which converge inward from the outside and meet each other with the reflecting portion 43. On the left and right sides of the inclined portion 42, the first and second main light emitting surfaces 44a and 44b, in which the amount of emitted light increases due to the reflection of the first and second inclined surfaces 42a and 42b, Is provided.

According to the embodiment of the present invention, the first and second inclined surfaces 42a and 42b are formed in a planar structure having the largest flatness in order to further increase the reflection amount of the light emitted to the side forward. In addition, the surfaces outside the first and second inclined surfaces 42a and 42b, that is, the first and second main light emitting surfaces 44a and 44b are formed in a curved structure to improve light emission characteristics. At this time, the inclination and the flatness of the first and second inclined surfaces 42a and 42b are important factors which determine the total amount of light to be totally reflected and the total reflection angle of light. Therefore, by changing the inclination and the flatness in the designing process, It is possible to easily adjust the amount of forward light of the element and / or the directivity angle range of the light.

The operation of the reflective portion 43 and the inclined portion 42 will be described in more detail with reference to FIG.

In FIG. 3, the reflecting portion 43 and the inclined portion 42, that is, the first and second inclined surfaces 42a and 42b are displayed between the first and second main light emitting surfaces 44a and 44b. In order to compare the light emitting surface of the conventional lens without the light emitting surface and the reflecting portion 43 and the inclined portion 42 according to the present invention, the existing light emitting surface omitting the reflecting portion 43 and the inclined portion 42 is a virtual line. As shown.

Referring to FIG. 3, light of a path such as arrow A and B is totally reflected by the first and second total reflection surfaces 42a and 42b of the inclined portion 42, thereby changing the traveling direction, It can be seen that the light is emitted outside the lens after passing through the second main emission surfaces 44a and 44b. On the other hand, the light of the path indicated by the arrow C is totally reflected into the lens by the reflecting portion 43, so that no light passes through the reflecting portion 43 and is emitted to the outside. As such, a large amount of light traveling from the light emitting diode chip toward the inclined portion 42 strikes the first and second inclined surfaces 42a and 42b and then to the outside through the first and second main light emitting surfaces 44a and 44b. By being emitted and only part of it being emitted to the first and second inclined surfaces 42a and 42b, the amount of light and the light intensity toward the front side can be greatly increased. On the other hand, the lens adopting the conventional light emitting surface without the reflecting portion 43 and the inclined portion 42 emits light of paths such as arrows A, B, and C directly to the outside, and the amount and intensity of light in the lateral direction are increased. It becomes small.

4 is a view schematically showing an array of light emitting elements including the above-described side light emitting elements.

4, the array according to an embodiment of the present invention includes side-emitting devices 1 emitting red, green, and blue lights R, G, and B, respectively, The white light W can be obtained. At this time, when the side light emitting element 1 including the total reflection part 42 (refer to Figs. 1 to 3) as in the previous embodiment is used, it is possible to reduce or eliminate the area where the color re- It is possible.

 Furthermore, by adjusting the slope and / or the flatness of the above-described slant portions, particularly, the first and second slant faces 42a and 42b in the lens designing process, it is possible to realize color mixing of desired light. At this time, the color mixing control of the light, the reflection characteristic value of the inclined portion, other specifications of the light emitting device, the distance between the light emitting elements, etc. may be used.

FIGS. 5 and 6 are graphs showing optical characteristics of a side light emitting device according to an embodiment of the present invention. FIG. 5 shows the amount of light emitted in a long axis direction of the side light emitting device, .

As can be seen from FIG. 5, the optical characteristics of the side light emitting device according to the embodiment of the present invention show a light emission amount of about 20% as compared with the peak value when the light amount at the center portion is at +/- 65 degrees have. That is, since most of the light emitted from the side light emitting device according to the embodiment of the present invention is emitted toward the side, the white light (W) having excellent color reproducibility and color sensitivity is reproduced when the array is constituted as shown in FIG. It is possible.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And should not be construed as limiting the scope of the present invention, but rather should be construed as exemplifying the invention.

The side light emitting device according to the present invention can be very usefully used for a light source and an illumination device in which a relatively large amount of light is required in the side direction. In particular, the present invention can increase the amount of light to the side front relatively inferior in color reproducibility in the array where color mixing of the light is required to obtain white light, and furthermore, through the lens design It makes it possible to adjust easily.

Claims (8)

A side package body having an opening on one side thereof, the bottom being a mounting surface, and perpendicular to the bottom; A light emitting diode chip installed in the opening and emitting light in a lateral direction of the package body; A transparent resin filled in the opening and covering the light emitting diode chip in contact with the light emitting diode chip, The transparent resin has a reflector for reflecting light emitted from the light emitting diode chip therein, and an inclined portion protruding on both sides of the reflector to reflect light emitted from the light emitting diode chip and emitting the light toward the side of the opening. Including a lens, Further comprising a light emitting portion extending from the inclined portion, And the inclined portion totally reflects a portion of the light from the light emitting diode chip to the light emitting portion, and transmits a portion of the light from the light emitting diode chip. The method according to claim 1, The reflector is formed in the center of the opening side light emitting device comprising a reflective film coated with aluminum on a transparent resin. The method according to claim 1, And the inclined portion includes a first inclined surface and a second inclined surface that extend on both sides of the reflecting portion. The method of claim 3, The first inclined surface and the second inclined surface is formed in a plane, the light emitting surface on both sides of the first inclined surface and the second inclined surface is a side light emitting device formed into a curved surface. In a light emitting device array in which side light emitting devices each emitting red, green, and blue light are aligned to obtain white light by color mixing of light, Each of the side light emitting elements, A side package body having an opening on one side thereof, the bottom being a mounting surface, and perpendicular to the bottom; A light emitting diode chip installed in the opening and emitting light in a lateral direction of the package body; A transparent resin filled in the opening and covering the light emitting diode chip in contact with the light emitting diode chip, The transparent resin has a reflector for reflecting light emitted from the light emitting diode chip therein, and an inclined portion protruding on both sides of the reflector to reflect light emitted from the light emitting diode chip and emitting the light toward the side of the opening. Including a lens, Further comprising a light emitting portion extending from the inclined portion, And the inclined portion totally reflects a portion of the light from the light emitting diode chip to the light emitting portion, and transmits a portion of the light from the light emitting diode chip. The method of claim 5, The inclined portion includes first and second inclined surfaces inclined to extend on both sides of the reflecting portion, and the color mixture of the light is controlled by the inclination or the top view of the first and second inclined surfaces. The method of claim 5, The area of the reflector is larger than the upper surface area of the light emitting diode chip array. The method according to claim 1, An area of the reflector is larger than the area of the upper surface of the LED chip.

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