KR101001786B1 - Light source package and lighting device having the same - Google Patents

Abstract

A light source package and a lighting device having the same are disclosed. The light source package includes a point light source; And an insulating layer formed to be spaced apart from the point light source by the vacuum layer and blocking heat emitted from the point light source.

Light source package, point light source, vacuum layer, insulating film, color conversion film, white light

Description

Light source package and lighting device having the same {LIGHT SOURCE PACKAGE AND ILLUMINATION DEVICE COMPRISING THE SAME}

The present invention relates to a light source package and a lighting device having the same.

The lighting device is a general term for a device that emits light by using electrical energy provided from the outside. The lighting device usually uses an incandescent bulb or a fluorescent lamp as its light source, and is utilized as a device for directly illuminating an object at night or indoors.

However, incandescent bulbs or fluorescent lamps have a disadvantage in that they need to be replaced frequently because of their large power consumption and short lifespan. In particular, fluorescent lamps use mercury, a carcinogen, which may be a target of regulation, and flickering may cause vision loss.

Recently, a lighting apparatus using a light emitting diode (LED) as a light source has been studied. The light emitting diode is a kind of point light source, and may be referred to as semi-permanent because it has a lifetime of about 100,000 hours. In addition, since the light emitting diode uses light having a longer wavelength than ultraviolet light, the light emitting diode has an advantage of being harmless to the human body.

As described above, the lighting device according to the background art is used as a direct lighting device, but its application range is expanding due to the development of information technology. For example, the lighting device may be manufactured in the form of a backlight unit and then mounted in a liquid crystal display (LCD) that displays an image. In the field of the liquid crystal display device, due to environmental and life issues, Research is underway to replace light sources with light emitting diodes.

On the other hand, in order to obtain white light using the above-described light emitting diodes, red, green, and blue light emitting diodes should be installed in close proximity, and red, green, and blue light emitted from them should be diffused and mixed. This is because each light emitting diode has a monochromatic peak wavelength.

However, when white light is to be realized through the above configuration, it may be difficult to obtain desired white light due to irregular hue or brightness of each light emitting diode.

Recently, research on a technique of implementing white light using a blue light emitting diode has been conducted. Specifically, a light source package is manufactured by inserting a phosphor for converting blue light emitted from the blue light emitting diode into white light into a molding part encapsulating the blue light emitting diode to block the blue light emitting diode from an air layer.

However, the above-described light source package has a problem that the phosphor may be damaged due to additional heat emitted from the blue light emitting diode.

Accordingly, the problem to be solved by the present invention is to provide a light source package and a lighting device having the same that can prevent the damage of the phosphor due to the heat emitted from the point light source.

Further objects to be solved by the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description. Could be.

The light source package according to an embodiment of the present invention for achieving the object to be solved is a point light source; And an insulating layer formed to be spaced apart from the point light source by a vacuum layer and blocking heat emitted from the point light source.

On the other hand, the light source package according to an embodiment of the present invention for achieving the problem to be solved is a blue light emitting diode; And an insulating layer formed to be spaced apart from the blue light emitting diode by a vacuum layer and blocking heat emitted from the blue light emitting diode.

On the other hand, the illumination device according to an embodiment of the present invention for achieving the problem to be solved is formed to be spaced apart from the point light source by a point light source and a vacuum layer includes an insulating film for blocking heat emitted from the point light source. A light source package; And an optical member for diffusing or condensing the light emitted from the light source package.

On the other hand, the illumination device according to an embodiment of the present invention for achieving the problem to be solved is formed to be spaced apart from the blue light emitting diode by a blue light emitting diode and a vacuum layer to block the heat emitted from the blue light emitting diode. A light source package including an insulating film; And an optical member for diffusing or condensing the light emitted from the light source package.

Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

According to the present invention, damage to the phosphor can be prevented through an insulating film which blocks heat emitted from the point light source. In addition, since the vacuum layer is formed between the point light source and the insulating film, the thermal blocking effect by the insulating film can be maximized. In addition, since it is not necessary to form a molding part encapsulating a point light source due to the vacuum layer, a light source package can be manufactured easily.

Hereinafter, a light source package and a lighting device having the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, like reference numerals refer to like elements throughout the specification.

In the light source package according to an embodiment of the present invention, a blue light emitting diode, which is a kind of point light source, is described as an example of the light source, but the present invention is not limited thereto. That is, the point light source included in the light source package of the present invention may be a light emitting diode other than a blue light emitting diode. In addition, the point light source provided in the light source package of the present invention may not be the above-described light emitting diode form.

1 is a cross-sectional view for schematically explaining the configuration of a light source package according to an embodiment of the present invention.

Referring to FIG. 1, the light source package 110 according to an exemplary embodiment of the present invention includes a blue light emitting diode 120 and an insulating layer 130, which are a kind of point light source. In addition, the light source package 110 according to an embodiment of the present invention may further include a color conversion film 150.

The blue light emitting diode 120 may be die bonded onto a heat sink 122 by thermocompression or ultrasonic compression. Here, the heat sink 122 is mounted from the inner bottom of the package body 124, and may radiate heat generated additionally from the blue light emitting diode 120 to the outside.

The blue light emitting diode 120 is electrically connected to each of the first and second lead frames 128a and 128b through the first and second wires 126a and 126b, respectively. The blue light emitting diode 120 may generate blue light using driving power applied from the outside through the first and second lead frames 128a and 128b. In this case, for example, a predetermined constant voltage may be applied to the first lead frame 128a from the outside, and a ground voltage may be applied to the second lead frame 128b.

The insulating layer 130 may block heat that is additionally emitted from the blue light emitting diode 120. For this reason, heat transmitted from the blue light emitting diode 120 may be prevented from being transferred to the color conversion film 150.

Since the insulating layer 130 only needs to be formed of a material having a heat shielding property and a light transmitting property, the insulating layer 130 is not particularly limited, but may be formed of transparent glass. The transparent glass not only has excellent workability but also has an advantage of low price.

The insulating layer 130 may be formed to be spaced apart from the blue light emitting diode 120 by the vacuum layer 140. For this reason, the thermal blocking effect by the insulating film 130 can be maximized. In addition, since it is not necessary to form a molding part encapsulating the blue light emitting diode 120 due to the vacuum layer 140, the light source package 110 according to an embodiment of the present invention can be more simply manufactured. Here, the vacuum degree of the vacuum layer 140 may be a low pressure of about 0.1 atm as well as a complete vacuum, which may vary depending on the specification of the light source package 110 and the material of the insulating film 130, but is not limited thereto.

The color conversion layer 150 may convert blue light incident from the blue light emitting diode 120 into white light, and may include a resin 152 constituting the shape and a phosphor 134 dispersed in the resin 152. have.

The resin 152 may be a silicone resin 152 having good ductility and predetermined light transmittance, but is not limited thereto.

The phosphor 154 may absorb light having a specific wavelength, for example, light having a blue wavelength emitted from the blue light emitting diode 120 to emit light having a different wavelength.

The phosphor 134 may include, for example, a yellow phosphor 154a, and may further include a green phosphor 154b and a red phosphor 154c, but this may vary depending on the type of specific light source. As such, it is not limited thereto.

As the yellow phosphor 154a, the green phosphor 154b, and the red phosphor 154c, for example, an inorganic phosphor can be used.

For example, as the yellow phosphor 154a, (Y1-x-yGdxCey) ₃ (Al1-zGaz) O ₁₂ (where x + y ≦ 1; 0 ≦ x ≦ 1; 0 ≦ y ≦ 1; 0 ≦ z A YAG-based inorganic phosphor represented by ≤1) can be used. The YAG-based inorganic phosphor is, for example, (Y1-x-yGdxCey) ₃ Al ₅ O ₁₂ (YAG: Gd, Ce), (Y1-xCex) ₃ Al ₅ O ₁₂ (YAG: Ce), (Y1- xCex) ₃ (Al1-yGay) ₅ O ₁₂ (YAG: Ga, Ce), (Y1-x-yGdxCey) ₃ (Al5-zGaz) ₅ O ₁₂ (YAG: Gd, Ga, Ce), (Gd1-xCex) SC ₂ Al ₃ O ₁₂ (GSAG) and the like. The main wavelength of the light emitted from the YAG inorganic phosphor may vary depending on the materials described above. For example, Ce ³⁺ emission depending on the garnet-based (Gd) can emit a variety of light emission from green (~ 540nm; YAG: Ga, Ce) to red (~ 600nm; YAG: Gd, Ce) without reducing the luminous efficiency have.

In addition, SrGa ₂ S ₄ : Eu ²⁺ may be used as the green phosphor 154b, and the green phosphor 154b may absorb light of 500 nm or less and emit light having a main wavelength of 535 nm.

In addition, SrB ₄ O ₇ : Sm ²⁺ may be used as the red phosphor 154c, and the red phosphor 154c may emit light having a main wavelength of 650 nm or more by absorbing the entire visible light region of 600 nm or less.

As described above, in the light source package 110 according to the exemplary embodiment of the present invention, the yellow phosphor 154a is included in the color conversion film 150. For this reason, when blue light is incident on the color conversion film 150, the blue light passing through the yellow phosphor 154a shows a gentle peak at 550 nm, which is the wavelength region of the yellow light, and the blue light not passing through the yellow phosphor 154a is inherently inherent. Since strong peaks can be exhibited at 450 nm, white light can be realized by their color mixing. In addition, due to the green phosphor 154b and the red phosphor 154c of the color conversion layer 150, blue light passing through each of the green phosphor 154b and the red phosphor 154c may peak at the green wavelength region and the red wavelength region. As they can be displayed, the chromaticity of the white light can be further increased as they are mixed.

As described above, the white light may be realized through the blue light emitting diode 120 and the color conversion film 150. For this reason, it is possible to manufacture the light source package 110, which is simple in manufacturing and simple in driving circuit. In addition, the light source package 110 according to an embodiment of the present invention may be manufactured in a single package form or may be manufactured in an array form by connecting the blue light emitting diodes 120 in series.

Meanwhile, the blue light emitting diode 120 may be dimmed for emotional lighting or brightness control. This will be described in detail with reference to FIG. 2.

2 is a block diagram illustrating a schematic configuration of a driving circuit for driving a light source package according to an embodiment of the present invention.

2, the driving circuit for driving the light source package 110 according to an embodiment of the present invention may include a dimming setting unit 160, a PWM control unit 170, and a DC-DC converter 180. have.

The dimming setting unit 160 may set the driving power of the blue light emitting diode 120 according to the dimming control signal Sdim input from the outside, and may provide the set driving power to the PWM controller 170. Here, the dimming control signal Sdim may be a signal input from the outside by a user's setting, but is not limited thereto. For example, the dimming control signal Sdim may be a signal generated by a separate control circuit for detecting blue light emitted from the blue light emitting diode 120 and matching luminance, color coordinates, and the like.

The PWM controller 170 controls the output pulse signal duty ratio of the PWM driver provided in the DC / DC converter 180 to provide the driving power set by the dimming setting unit 160 to the blue light emitting diode 120. It generates a PWM control signal for, and can provide the generated PWM control signal to the DC / DC converter 180.

The DC / DC converter 180 generates a constant voltage in a PWM driving manner according to the PWM control signal provided from the PWM control unit 170, and the generated constant voltage is, for example, the first lead frame of the blue light emitting diode 120 ( 128a) to drive the blue light emitting diodes 120. In this case, a ground voltage may be applied to the second lead frame 128b of the blue light emitting diode 120.

On the other hand, Figure 3 is a cross-sectional view for schematically illustrating the configuration of a lighting device having a light source package according to an embodiment of the present invention. In FIG. 3, a lighting device that can be mounted on a liquid crystal display as a lighting device, that is, a backlight unit is illustrated. However, the lighting device of the present invention is not limited thereto. On the other hand, since the light source package is the same as described above, it will be described using the same reference numerals, and redundant description will be omitted, and only the features thereof will be described.

Referring to FIG. 3, the lighting apparatus 200 according to an embodiment of the present invention includes a light source package 110 and an optical member 220. In addition, although not shown, the lighting device 200 according to an embodiment of the present invention may further include a reflector disposed under the light source package 110. The light source package 110, the optical member 220, and the reflector may be accommodated in the bottom cover 230.

The light source package 110 may be mounted in series on a metal core printed circuit board (MCPCB) 212 that is easy to dissipate heat. Here, the light reflection layer may be coated on the upper surface of the metal core printed circuit board 212 to reflect the light emitted from the light source package 110.

The optical member 220 may diffuse or collect white light emitted from the light source package 110, and may include a diffuser plate 222 and an optical sheet 224.

The diffuser plate 222 may be disposed on the light source package 110, and in order to prevent the shape of the light source package 110 from being visible through the lighting apparatus 200, the diffuser plate 222 may upwardly emit white light emitted from the light source package 110. Can spread.

The optical sheet 224 may include a diffusion sheet 224a and first and second prism sheets 224b and 224c stacked in order. The diffusion sheet 224a may diffuse the light diffused through the diffusion plate 222 again, and each of the first and second prism sheets 224b and 224c may collect light diffused by the diffusion sheet 224a. You can. Here, the number, type, and stacking order of the optical sheet 224 may vary depending on the specification of the lighting apparatus 200, and are not limited to the above.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can realize that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. I can understand that.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

1 is a cross-sectional view for schematically explaining the configuration of a light source package according to an embodiment of the present invention.

2 is a block diagram illustrating a schematic configuration of a driving circuit for driving a light source package according to an embodiment of the present invention.

3 is a cross-sectional view for schematically illustrating a configuration of a lighting device having a light source package according to an embodiment of the present invention.

{Description of symbols for main parts of the drawing}

110: light source package 120: blue light emitting diode

130: insulating film 140: vacuum layer

150: color conversion film 200: lighting device

220: optical member

Claims (9)

Point light source; An insulating layer formed to be spaced apart from the point light source by a vacuum layer and blocking heat emitted from the point light source; And A color conversion film formed on the insulating film and converting light incident from the point light source into white light; Light source package comprising a. delete The method of claim 1, The point light source is a light source package, characterized in that the blue light emitting diode. The method of claim 1, The insulating film is a light source package, characterized in that formed of transparent glass. The method of claim 1, The color conversion film is a light source package, characterized in that it comprises a yellow phosphor. The method of claim 1, The color conversion film further comprises a green phosphor and a red phosphor. A light source package formed to be spaced apart from the point light source by a point light source and a vacuum layer, the light source package including an insulating film to block heat emitted from the point light source; And Optical member for diffusing or condensing light emitted from the light source package Lighting device comprising a. The method of claim 7, wherein The light source package is formed on the insulating layer and converts light incident from the point light source into white light. Lighting device comprising more. The method of claim 7, wherein The point light source of the light source package is a lighting device, characterized in that the blue light emitting diode.

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