KR101504309B1 - Light emitting device package and backlight unit having it - Google Patents

Abstract

The present invention relates to a light emitting device package and a backlight unit having the same, which can prevent the lens from being distorted and reduce the occurrence of luminance and color deviations, and more particularly, to an encapsulant which can be installed on a substrate to surround the periphery of the light emitting device. And a guide member provided on at least one rim portion of the encapsulation member and guiding an assembling path of the lens.

Description

[0001] Light emitting device package and backlight unit having same [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light emitting device package and a backlight unit having the same, and more particularly, to a light emitting device package and a backlight unit having the same that can prevent a lens from being distorted and reduce luminance and color variations.

A light emitting diode (LED) is a kind of semiconductor device that can emit light of various colors by forming a light emitting source through the formation of a PN diode of a compound semiconductor. Such a light emitting device has a long lifetime, can be reduced in size and weight, has a strong directivity of light, and can be driven at a low voltage. Further, such an LED is resistant to impact and vibration, does not require preheating time and complicated driving, can be packaged in various forms, can be modularized for various purposes, and can be applied to various lighting devices and display devices.

Open Patent Publication No. 10-2005-0119546 (disclosed on December 21, 2005) Japan Published Patent Specification 2013-505572 (February 14, 2013) Open Patent Publication No. 10-2012-70280 (published on June 29, 2012) Published Patent Publication No. 10-2010-106297 (published on October 1, 2010) Published Patent Application No. 10-2011-0109221 (published on October 10, 2011)

The direct-type light emitting device package widely used in the backlight unit can widely disperse light generated from the light emitting device package through the secondary lens so as to reduce the thickness of the unit and uniformly irradiate the light to the light guide plate.

However, in the conventional light emitting device package, when the secondary lens is assembled, the secondary lens is distorted to cause luminance and color deviation. Such luminance and chromatic aberration deteriorate optical characteristics, and the light emitted from the light guide plate or the display panel The uniformity is remarkably lowered, and the product is defective.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to facilitate alignment of a lens using a guide member and improve the assembling precision of a lens, thereby preventing luminance and color deviation of a display device, It is an object of the present invention to provide a light emitting device package and a backlight unit having the same, which can improve quality, produce a high quality product, align lenses in multiple stages, prevent lens breakage, and facilitate lens alignment. However, these problems are exemplary and do not limit the scope of the present invention.

According to an aspect of the present invention, there is provided a light emitting device package including: an encapsulant that can be installed on a substrate to surround a periphery of a light emitting device; And a guide member provided on at least one rim portion of the encapsulation member and guiding an assembling path of the lens.

Further, according to the idea of the present invention, the sealing member is in the form of a rectangular plate as a whole, and the guide member can be installed to the four corners of the sealing member toward the lens.

According to an aspect of the present invention, the guide member may include: a first inclined surface portion having a relatively steep inclined surface to guide the light-incident portion of the lens; A second inclined surface portion having a relatively gentle slope so that the light-incident portion of the lens can be guided secondarily; And a contact surface portion having a contact surface to be finally brought into contact with and fixed to the light-incident portion of the lens.

According to an aspect of the present invention, the guide member may be molded integrally with the sealing member so that at least two or more guide members are formed in the lens direction.

According to an aspect of the present invention, the guide member includes: a flat upper surface portion; And a lower surface portion having a larger area than the upper surface portion.

According to the idea of the present invention, the edge between the flat top surface portion and the first inclined surface portion, and the edge between the first inclined surface portion and the second inclined surface portion can be rounded.

According to an aspect of the present invention, the inclined internal angle of the first inclined face portion is 100 to 135 degrees with respect to the upper face portion, and the inclined internal angle of the second inclined face portion with respect to the first inclined face portion is 150 to 175 degrees have.

According to an aspect of the present invention, the guide member may further include an engagement surface portion provided on the contact surface portion so as to be engaged with the engagement portion formed in the light-incoming portion of the lens.

According to an aspect of the present invention, the first inclined surface portion, the second inclined surface portion, and the contact surface portion of the guide member may be provided on a corner of the sealing material.

According to another aspect of the present invention, there is provided a light emitting device package including: a light emitting device package including a light emitting device package;

According to an aspect of the present invention, the guide member may further include a stopper portion connected to the contact surface portion and contacting a lower surface of the light-incoming portion of the lens.

According to an aspect of the present invention, there is provided a backlight unit including: an encapsulant that can be installed on a substrate to surround a periphery of a light emitting device; At least one or more guide members provided on the rim of the encapsulating member and guiding the assembling route of the lens; And a light guide plate installed in a path of light generated in the light emitting device.

According to some embodiments of the present invention as described above, it is possible to improve optical characteristics when assembled with a lens to prevent product defects, to arrange the lenses in multiple stages at the time of lens alignment, It is possible to prevent misalignment of all types of lenses. Of course, the scope of the present invention is not limited by these effects.

1 is a cross-sectional view illustrating a light emitting device package according to some embodiments of the present invention.
Fig. 2 is an enlarged view showing a portion A in Fig. 1 on an enlarged scale.
3 is a plan view showing an example of the light emitting device package of Fig.
4 is a perspective view showing an example of the guide member of Fig.
FIGS. 5 to 7 are sectional views showing steps of the guide member of FIG. 1 aligning the light-incident portion of the lens.
8 is a cross-sectional view showing another example of the light emitting device package of Fig.
9 is a cross-sectional view illustrating a light emitting device package according to some other embodiments of the present invention.
10 is a cross-sectional view illustrating a backlight unit according to some embodiments of the present invention.

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

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, The present invention is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated" or "coupled to" another element, It will be appreciated that elements may be directly "on", "connected", "laminated" or "coupled" to another element, or there may be other elements intervening therebetween. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, it is interpreted that there are no other components intervening therebetween do. Like numbers refer to like elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, in the figures the elements are turned over so that the elements depicted as being on the top surface of the other elements are oriented on the bottom surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure. If the elements are oriented in different directions (rotated 90 degrees with respect to the other direction), the relative descriptions used herein can be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

FIG. 1 is an enlarged cross-sectional view showing a light emitting device package 100 according to some embodiments of the present invention, FIG. 2 is an enlarged view showing part A of FIG. 1, FIG. 4 is a perspective view showing an example of the guide member 50 of FIG. 1; FIG.

1 to 4, a light emitting device package 100 according to some embodiments of the present invention includes a substrate 10, a light emitting device 20, a sealing material 30, And may include a guide member 50.

The substrate 10 can receive the light emitting device 20 and is electrically connected to the light emitting device 20. The substrate 10 may have appropriate mechanical strength and insulation property to support the light emitting device 20, Or a conductive material.

For example, the substrate 10 may include various wiring layers to connect the light emitting device 20 with an external power source, and may include a printed circuit board (PCB) having a plurality of epoxy resin sheets formed thereon, Lt; / RTI > The substrate 10 may be a Flexible Printed Circuit Board (FPCB) made of a flexible material.

In addition, the substrate 10 may be a synthetic resin substrate such as a resin or a glass epoxy or a ceramic substrate in consideration of a thermal conductivity. In addition, the substrate 10 may be formed of an insulating material such as aluminum, copper, zinc, tin, A metal substrate such as silver can be applied, and a plate or a lead frame substrate can be applied.

In addition, the light emitting device 20 may be mounted on the substrate 10, and FIG. 1 illustrates a state in which one light emitting device 20 is mounted on the substrate 10.

In addition, a plurality of light emitting devices 20 may be mounted on the substrate 10.

The light emitting device 20 may be formed of a semiconductor. For example, LEDs of blue, green, red, and yellow light emission, and LEDs of ultraviolet light emission, which are made of a nitride semiconductor, can be applied. The nitride semiconductor is represented by a general formula Al _x Ga _y In _z N (0? X? 1, 0? Y? 1, 0? Z? 1, x + y + z = 1).

The light emitting device 20 can be formed by epitaxially growing nitride semiconductors such as InN, AlN, InGaN, AlGaN, and InGaAlN on a sapphire substrate for growth or a silicon carbide substrate by a vapor phase growth method such as MOCVD To grow. The light emitting device 20 may be formed using semiconductors such as ZnO, ZnS, ZnSe, SiC, GaP, GaAlAs, and AlInGaP in addition to the nitride semiconductor. These semiconductors can be stacked in the order of an n-type semiconductor layer, a light emitting layer, and a p-type semiconductor layer. The light emitting layer (active layer) may be a laminated semiconductor having a multiple quantum well structure or a single quantum well structure or a laminated semiconductor having a double hetero structure. In addition, the light emitting device 20 can be selected to have an arbitrary wavelength depending on the application such as display use and illumination use.

Here, as the growth substrate, an insulating, conductive or semiconductor substrate may be used if necessary. For example, the growth substrate may be sapphire, SiC, Si, MgAl 2 O 4, MgO, LiAlO 2, LiGaO 2, GaN. A GaN substrate, which is a homogeneous substrate, is preferable for epitaxial growth of a GaN material, but a GaN substrate has a problem of high production cost due to its difficulty in manufacturing.

Sapphire and silicon carbide (SiC) substrates are mainly used as the different substrates. Sapphire substrates are more utilized than expensive silicon carbide substrates. When using a heterogeneous substrate, defects such as dislocation are increased due to the difference in lattice constant between the substrate material and the thin film material. Also, due to the difference in the thermal expansion coefficient between the substrate material and the thin film material, warping occurs at a temperature change, and warping causes a crack in the thin film. This problem may be reduced by using the buffer layer 1502 between the substrate 1501 and the light emitting stacked body S which is GaN-based.

In addition, the substrate for growth may be completely or partially removed or patterned in order to improve the optical or electrical characteristics of the LED chip before or after the growth of the LED structure.

For example, in the case of a sapphire substrate, the substrate can be separated by irradiating the laser to the interface with the semiconductor layer through the substrate, and the silicon or silicon carbide substrate can be removed by a method such as polishing / etching.

Another supporting substrate may be used for removing the growth substrate. In order to improve the light efficiency of the LED chip on the opposite side of the growth substrate, the supporting substrate may be bonded using a reflective metal, As shown in FIG.

In addition, patterning of the growth substrate improves the light extraction efficiency by forming irregularities or slopes before or after the LED structure growth on the main surface (front surface or both sides) or side surfaces of the substrate. The size of the pattern can be selected from the range of 5 nm to 500 μm and it is possible to make a structure for improving the light extraction efficiency with a rule or an irregular pattern. Various shapes such as a shape, a column, a mountain, a hemisphere, and a polygon can be adopted.

In the case of the sapphire substrate, the crystals having hexagonal-rhombo-R3b symmetry have c-axis and a-side lattice constants of 13.001 and 4.758, respectively, and C (0001) (1102) plane, and the like. In this case, the C-plane is relatively easy to grow the nitride film, and is stable at high temperature, and thus is mainly used as a substrate for nitride growth.

Another material of the growth substrate is a Si substrate, which is more suitable for large-scale curing and relatively low in cost, so that mass productivity can be improved. There is a need for a technique for suppressing the occurrence of crystal defects due to the difference in lattice constant between the Si substrate having the (111) plane as the substrate surface and the lattice constant difference of about 17% with GaN. Further, the difference in thermal expansion coefficient between silicon and GaN is about 56%, and a technique for suppressing the wafer warping caused by the difference in thermal expansion rate is needed. Wafer warpage can cause cracking of the GaN thin film, and process control is difficult, which can cause problems such as a large scattering of the emission wavelength in the same wafer.

In addition, since the silicon (Si) substrate absorbs light generated from the GaN-based semiconductor and the external quantum efficiency of the light emitting device is lowered, the substrate may be removed as necessary, and Si, Ge, SiAl, A support substrate such as a metal substrate is further formed and used.

When a GaN thin film is grown on a different substrate such as the Si substrate, the dislocation density increases due to the lattice constant mismatch between the substrate material and the thin film material, and cracks and warpage Lt; / RTI > The buffer layer may be disposed between the growth substrate and the light emitting stack for the purpose of preventing dislocation and cracking of the light emitting stack. The buffer layer also functions to reduce the scattering of the wavelength of the wafer by adjusting the degree of warping of the substrate during the growth of the active layer.

Here, the buffer layer may be made of Al _x In _y Ga _1-xy N (0? X? 1, 0? _Y? 1, x + y? 1), in particular GaN, AlN, AlGaN, InGaN or InGaNAlN. Materials such as ZrB2, HfB2, ZrN, HfN and TiN can also be used as needed. Further, a plurality of layers may be combined, or the composition may be gradually changed.

Further, although not shown, the light emitting device 20 may be a flip chip type light emitting device having a signal transmitting medium such as a bump, a pad, or a solder. In addition, the light emitting device 20 may be a vertical type or a horizontal type And the like can be applied.

3, the sealing material 30 is provided on the substrate 10 and has a through hole formed so as to surround the periphery of the light emitting device 20. For example, The through hole may be circular. In addition, the through-hole may be in a wide variety of shapes, such as a square, an elliptical hole, a polygonal hole, a trapezoidal shape, and a composite shape.

The encapsulant 30 may be made of at least one of EMC, EMC including at least a reflective material, white silicone containing a reflective material, PSR (Photo Solder Resister), and combinations thereof.

3, the encapsulant 30 may be molded into the substrate 10 as a whole in a rectangular plate shape, or may be dispensed or screen-printed.

More specifically, for example, the encapsulation material 30 may be a modified silicone resin composition such as an epoxy resin composition, a silicone resin composition, a modified epoxy resin composition such as a silicone modified epoxy resin, or an epoxy modified silicone resin, A resin such as a polyamide resin, a mid resin composition, a modified polyimide resin composition, polyphthalamide (PPA), polycarbonate resin, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), ABS resin, phenol resin, acrylic resin, Can be applied.

It is also possible to add a light reflective reflecting material such as titanium oxide, silicon dioxide, titanium dioxide, zirconium dioxide, potassium titanate, alumina, aluminum nitride, boron nitride, mullite, chromium, .

Also, as shown in FIG. 8, the shape of the encapsulant 30 may vary widely. Accordingly, the shape of the encapsulant 30 of the light emitting device package 100 according to some embodiments of the present invention is not limited to the shape shown in FIG.

2, the guide member 50 is provided at each of the four edges of the sealing member 30 and guides the assembly path of the lens 40. As shown in FIG. 2, A contact surface portion 53, an upper surface portion 54, a lower surface portion 55, and a stopper portion 56. The first inclined surface portion 51, the second inclined surface portion 52, the contact surface portion 53,

As shown in FIG. 2, the first inclined surface portion 51 is a portion having a first inclination that is relatively gentle so that the light incident portion 40a of the lens 40 can be guided first.

The second inclined surface portion 52 is provided in parallel with the first inclined surface portion 51 so as to guide the light incident portion 40a of the lens 40 secondarily, Is a portion having a sharp second slope.

In addition, the contact surface portion 53 is a portion that is continuously connected to the second inclined surface portion so as to be finally contacted and fixed to the light-incident portion 40a of the lens 40, and has a contact surface. Here, the contact surface portion 53 may have a tilt angle of 90 degrees which coincides with the direction in which the lens 40 is assembled.

The upper surface portion 54 is a portion formed at a position where the first inclined surface portion 51 starts and the lower surface portion 55 is a portion formed at a point where the contact surface portion 53 ends .

Herein, the bottom surface portion 55 has a larger area than the top surface portion 54. For example, as shown in FIGS. 1 to 4, the light emitting device package 100 according to some embodiments of the present invention, The guide member 50 of the main body 100 may be broad in the bottom as a whole and narrow in the top.

As shown in Fig. 2, when guiding the light-incident portion 40a of the lens 40 to be described later, the light-guiding portion 40a is guided in a gently inclined direction in a first order, The inclined internal angle K1 of the first inclined face portion 51 is 100 to 135 degrees with respect to the upper face portion 54. The inclined internal angle K1 of the first inclined face portion 51 is 100 to 135 degrees with respect to the first inclined face portion 51, The inclined internal angle K2 of the contact surface portion 53 may be at least 150 degrees to 175 degrees and the inclined internal angle K3 of the contact surface portion 53 with respect to the second inclined surface portion 52 may be at least the inclined internal angle K2.

2, when the light incident portion 40a of the lens 40 is collided, the flat upper surface portion 54 and the first inclined surface portion 51 are formed so as to prevent breakage of the component, And the edge R2 between the first inclined surface portion 51 and the second inclined surface portion 52 can be rounded and corrugated, respectively.

2, the stopper portion 56 is connected to the contact surface portion 53 and is in contact with the lower surface 42 of the light input portion 40a of the lens 40 And can substantially determine the assembling position of the light-incident portion 40a of the lens. Alternatively, the upper surface of the stopper portion 56 may be lower than the lower surface portion 55 for seating the lens 40.

3, the sealing member 30 has a rectangular plate shape as a whole, and the guide member 50 has the lens 40 at four corners of the sealing member 50 The sealing member 30 may be molded integrally with the sealing member 30 such that four protrusions are formed.

The guide member 50 may be molded integrally with the encapsulant 30 such that at least two or more protrusions are protruded in the direction of the lens 40.

4, the inclination angle K4 of the side surface 58 of the guide member 50 may be less than 45 degrees.

The guide member 50 may be formed of at least one selected from the group consisting of EMC, EMC including at least a reflective material, white silicon containing a reflective material, PSR (Photo Solder Resister), and combinations thereof.

Further, the guide member 50 may be molded on the substrate 10, or may be dispensed or screen-printed.

More specifically, for example, the guide member 50 may be formed of a modified silicone resin composition such as an epoxy resin composition, a silicone resin composition, a modified epoxy resin composition such as a silicone modified epoxy resin and an epoxy modified silicone resin, A resin such as a polyamide resin, a mid resin composition, a modified polyimide resin composition, polyphthalamide (PPA), polycarbonate resin, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), ABS resin, phenol resin, acrylic resin, Can be applied.

Further, a light reflecting material such as titanium oxide, silicon dioxide, titanium dioxide, zirconium dioxide, potassium titanate, alumina, aluminum nitride, boron nitride, mullite, chromium, have.

The material forming the guide member 50 may be the same material as the encapsulation material 30, or may be another material. The other material means that the kind and composition are not identical at all.

Although not shown, the guide member 50 does not protrude in the direction of the lens 40, and the first inclined surface portion 51 of the guide member 50, the second inclined surface portion 52, The stopper portion 53 may be provided on the side of the corner of the sealing material 30, and the stopper portion 56 may be omitted.

1, a light emitting device package 100 according to some embodiments of the present invention may be configured such that a part of an inner surface of the light-incident portion 40a is in contact with a guide member 50, (40) provided with a fixing portion (41) fixed to the lens barrel (10).

FIGS. 5 to 7 are cross-sectional views sequentially showing the process of aligning the light-incident portion 40a of the lens 40 with the guide member 50 of FIG.

5, the light-incident portion 40a of the lens 40 is aligned with the light-incident surface 40a of the light-emitting device package 100 according to some embodiments of the present invention. Can be guided along the first inclined surface portion (51) of the guide member (50). At this time, the light-incident portion 40a of the lens 40 moves along the upper surface portion 54 and can be macroscopically guided by the first inclined surface portion 51 of the guide member 50 first.

6, the light-incident portion 40a of the lens 40 may be guided along the second inclined surface portion 52 of the guide member 50. As shown in FIG. At this time, while being guided finely by the second inclined surface portion 52, the light incident portion 40a of the lens 40 is finely aligned with the other light incident portions 40a in balance with the force .

For example, when the light incident portion 40a on one side of the lens 40 enters the second slope side portion 52, the other side light incident portions 40a of the lens 40 are also incident on the second slope side portion 52) to balance the forces.

That is, the first inclined surface portion 51 can align the macroscopic position of the lens 40 first, and the second inclined surface portion 52 can align the lens 40 finely .

7, the light-incident portion 40a of the lens 40 is finally brought into contact with the contact surface portion 53 and the lower surface of the light-incident portion 40a is guided by the stopper portion 56, the lens 40 can be aligned in the correct position.

Therefore, it is possible to easily align the lens 40 by using the guide member 50 and improve the assembling precision of the lens 40, thereby preventing brightness and color variation of the display device, thereby improving optical characteristics, And the lens 40 can be aligned in multiple stages using the first inclined surface portion 51, the second inclined surface portion 52, the contact surface portion 53 and the stopper portion 56 So that breakage of the lens can be prevented, and accuracy of lens alignment can be improved.

9 is a cross-sectional view illustrating a light emitting device package 200 according to some other embodiments of the present invention.

9, the light emitting device package 200 according to some other embodiments of the present invention is characterized in that the guide member 50 is provided with a latching part (not shown) formed in the light entering part 40a of the lens 40 And an engaging surface portion 57 provided on the contact surface portion 53 so as to be engaged with the contact surface portion 43. [

Therefore, the light-incident portion 40a of the lens 40 can be engaged with the engagement surface portion 57 to further strengthen the coupling force between the lens 40 and the sealing material 30, You can easily check the alignment status by feeling or sound.

The engaging portion 43 and the engaging portion 57 are respectively formed on the light incident portion 40a and the contact surface portion 53 of the lens 40. Conversely, The contact surface portion 53 and the light-incident portion 40a of the lens 40 are also possible.

On the other hand, although not shown, a phosphor may be provided around the light emitting element 20. For example, such a phosphor may have the following composition formula and color.

Oxide system: yellow and green Y3Al5O12: Ce, Tb3Al5O12: Ce, Lu3Al5O12: Ce

(Ba, Sr) 2SiO4: Eu, yellow and orange (Ba, Sr) 3SiO5: Ce

Eu, Sr2Si5N8: Eu, SrSiAl4N7: Eu, Eu3O3: Eu, Eu3O3: Eu,

The composition of the phosphor should basically correspond to stoichiometry, and each element may be substituted with another element in each group on the periodic table. For example, Sr can be substituted with Ba, Ca, Mg, etc. of the alkaline earth (II) group, and Y can be replaced with lanthanum series of Tb, Lu, Sc, Gd and the like. Ce, Tb, Pr, Er, Yb and the like, and the active agent may be used alone or as a negative active agent for the characteristic modification.

As a substitute for the phosphor, materials such as a quantum dot may be used. Alternatively, a fluorescent material and QD may be mixed with the LED or used alone.

QD can be composed of a core (3 to 10 nm) such as CdSe and InP, a shell (0.5 to 2 nm) such as ZnS and ZnSe, and a ligand for stabilizing the core and the shell. Can be implemented.

In addition, the coating method of the fluorescent material or the quantum dot may include at least one of a method of being applied to an LED chip or a light emitting device, a method of covering the material in a film form, a method of attaching a sheet form such as a film or a ceramic fluorescent material .

Dispensing and spray coating are common methods of spraying, and dispensing includes mechanical methods such as pneumatic method and screw, linear type. It is also possible to control the amount of dyeing through a small amount of jetting by means of a jetting method and control the color coordinates thereof. The method of collectively applying the phosphor on the wafer level or the light emitting device substrate by the spray method can easily control productivity and thickness.

The method of directly covering the light emitting device or the LED chip in a film form can be applied by a method of electrophoresis, screen printing or phosphor molding, and the method can be different according to necessity of application of the side of the LED chip.

In order to control the efficiency of the long-wavelength light-emitting phosphor that reabsers light emitted from a short wavelength among two or more kinds of phosphors having different emission wavelengths, two or more kinds of phosphor layers having different emission wavelengths can be distinguished. A DBR (ODR) layer may be included between each layer to minimize absorption and interference.

In order to form a uniform coating film, the phosphor may be formed into a film or ceramic form and then attached onto the LED chip or the light emitting device.

In order to make a difference in light efficiency and light distribution characteristics, a photoelectric conversion material may be located in a remote format. In this case, the photoelectric conversion material is located together with a transparent polymer, glass, or the like depending on its durability and heat resistance.

Since the phosphor coating technique plays a major role in determining the optical characteristics in the light emitting device, control techniques such as the thickness of the phosphor coating layer and the uniform dispersion of the phosphor have been studied variously. QD can also be placed in the LED chip or the light emitting element in the same manner as the phosphor, and can be positioned between the glass or translucent polymer material for light conversion.

12 is a cross-sectional view illustrating a backlight unit according to some embodiments of the present invention.

12, the backlight unit according to some embodiments of the present invention includes a substrate 10, a light emitting element 20, an encapsulant 30, a guide member 50, and a light guide plate 60 ).

1 to 5, the light emitting device 20, the encapsulation material 30, and the guide member 50 are disposed on the LCD panel, And the structure and effect thereof may be the same.

The light guide plate 60 is installed in a path of light generated by the light emitting device 20 and transmits the light generated from the light emitting device 20 in a larger area. The material of the light pipe 60 is polycarbonate Series, polysulfone series, polyacrylate series, polystyrene series, polyvinyl chloride series, polyvinyl alcohol series, polynorbornene series, polyester, and the like. In addition, materials of various translucent resin series may be applied. The light guide plate 60 may be formed by various methods such as forming fine patterns, fine protrusions, diffusion films, or the like on the surface, or forming fine bubbles therein.

The backlight unit according to some embodiments of the present invention may be a direct-type backlight unit in which the light emitting device 20 is installed below the light guide plate 60.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: substrate
20: Light emitting element
30: Encapsulation material
40: lens
40a:
41:
42: When
43:
50: Guide member
51: first inclined face portion
52: second inclined surface portion
53:
54:
56: stopper portion
57:
58: Side
R1, R2: Corner
K1, K2, K3, K4: inclined cabinet
60: light guide plate
100, 200: light emitting device package

Claims (11)

An encapsulant which can be installed on the substrate so as to surround the periphery of the light emitting element; And
At least one or more guide members provided on the rim of the encapsulating member and guiding the assembling route of the lens;
Lt; / RTI >
The guide member
A first inclined surface portion having a first inclined surface for guiding the light incoming portion of the lens in a first direction;
A second inclined surface portion having an inclined surface relatively steeper than the first inclined surface portion so that the light incident portion of the lens can be guided secondarily; And
A contact surface portion having a contact surface to be finally brought into contact with the light-incident portion of the lens;
Emitting device package. The method according to claim 1,
The encapsulating material has a generally rectangular plate shape,
Wherein the guide member is provided to face the lens at four corners of the sealing member. delete The method according to claim 1,
The guide member
And is molded integrally with the encapsulation material in the lens direction. The method according to claim 1,
The guide member
A flat upper surface portion; And
A lower surface portion having a larger area than the upper surface portion;
Emitting device package. 6. The method of claim 5,
The edge between the upper surface portion and the first inclined surface portion, and the edge between the first inclined surface portion and the second inclined surface portion are rounded and corrugated, respectively. 6. The method of claim 5,
Wherein the inclined inner angle of the first inclined face portion is 100 to 135 degrees with respect to the upper face portion,
And the inclined internal angle of the second inclined surface portion is from 150 degrees to 175 degrees with respect to the first inclined surface portion. The method according to claim 1,
The guide member
An engaging surface portion provided on the contact surface portion so as to be engaged with the engaging portion formed on the light-incident portion of the lens;
Emitting device package. The method according to claim 1,
Wherein the first inclined surface portion, the second inclined surface portion, and the contact surface portion of the guide member are provided on a corner of the sealing material. The method according to claim 1,
The guide member
A stopper portion connected to the contact surface portion and contacting a lower surface of the light-incident portion of the lens;
Emitting device package. An encapsulant which can be installed on the substrate so as to surround the periphery of the light emitting element;
At least one or more guide members provided on the rim of the encapsulating member and guiding the assembling route of the lens; And
A light guide plate installed in a path of light generated in the light emitting device;
/ RTI >
The guide member
A first inclined surface portion having a first inclined surface for guiding the light incoming portion of the lens in a first direction;
A second inclined surface portion having an inclined surface relatively steeper than the first inclined surface portion so that the light incident portion of the lens can be guided secondarily; And
A contact surface portion having a contact surface to be finally brought into contact with the light-incident portion of the lens;
And a backlight unit.

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