KR20130075970A - Light conversion plate and illumination device using the same - Google Patents

Light conversion plate and illumination device using the same Download PDF

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Publication number
KR20130075970A
KR20130075970A KR1020110144321A KR20110144321A KR20130075970A KR 20130075970 A KR20130075970 A KR 20130075970A KR 1020110144321 A KR1020110144321 A KR 1020110144321A KR 20110144321 A KR20110144321 A KR 20110144321A KR 20130075970 A KR20130075970 A KR 20130075970A
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KR
South Korea
Prior art keywords
light
wavelength conversion
light source
layer
conversion layer
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KR1020110144321A
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Korean (ko)
Inventor
정정화
Original Assignee
서울반도체 주식회사
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Priority to KR1020110144321A priority Critical patent/KR20130075970A/en
Publication of KR20130075970A publication Critical patent/KR20130075970A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/68—Details of reflectors forming part of the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2101/00—Point-like light sources

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

Disclosed is a light conversion plate, the light conversion plate is a wavelength conversion layer disposed to be spaced apart from the light source so that the front surface facing the light source; And a reflective layer formed on a rear surface of the wavelength conversion layer, wherein the reflective layer reflects light that has passed through the wavelength conversion layer from the light source.

Description

LIGHT CONVERSION PLATE AND ILLUMINATION DEVICE USING THE SAME}

The present application relates to a light conversion plate and a lighting device using the same.

Conventional remote phosphor lighting has a structure in which a blue LED and a phosphor plate disposed in front thereof are coupled. Accordingly, the white light is realized by combining the yellow light (green light) transmitted through the phosphor and the blue light transmitted through the phosphor.

However, in a direct lighting method such as a remote phosphor lighting or an illumination in which a phosphor layer is directly coupled onto an LED, light emitted from the LED is back scattered in the phosphor layer, resulting in a loss of light conversion. There was a problem that occurs. In order to solve this problem, SWPF and high reflectivity reflector structure are applied, but there is still some light conversion loss (about 20 ~ 30%).

In addition, in the case of the direct lighting method, since the light emitting diode and the phosphor layer are directly in contact with or close to each other, the phosphor is easily deteriorated due to heat generated by the light emitting diode which easily reaches the phosphor and heat generated by the phosphor quantum efficiency. In addition, a large amount of light emitted from the light emitting diode has a problem of causing glare due to the LED spot (spot) due to the nature of the direct lighting method that is directly irradiated to the outside of the front.

The present invention is to solve the above-mentioned problems of the prior art, and to provide a light conversion plate and a lighting device using the same to remove the light conversion loss and maximize the emission of heat generated to achieve reliable high efficiency lighting. It is done.

As a technical means for achieving the above technical problem, the light conversion plate according to the first aspect of the present application, the wavelength conversion layer is spaced apart from the light source so that the front surface facing the light source; And a reflective layer formed on a rear surface of the wavelength conversion layer, wherein the reflective layer may reflect light reaching through the wavelength conversion layer from the light source.

On the other hand, the lighting apparatus according to the second aspect of the present application, the light conversion plate according to the first aspect of the present application; And a frame in which the light conversion plate is mounted and an opening is formed to face the front surface of the wavelength conversion layer, and the light source may be mounted on the frame to be spaced apart from the front surface of the wavelength conversion layer.

According to the aforementioned problem solving means of the present application, the light source is spaced apart from the front surface of the wavelength conversion layer, the reflection layer is formed on the rear surface of the wavelength conversion layer, it can be re-reflected with a high reflectance, back scattering (etc.) Due to the light loss can be minimized, and the spot is not generated due to the direct light irradiation can be prevented glare, it is possible to implement a uniform illumination of high light efficiency.

In addition, since the light source is spaced apart from the front surface of the wavelength conversion layer, it is possible to prevent damage to the wavelength conversion material included in the wavelength conversion layer, for example, the wavelength conversion layer due to deterioration due to heat generation of the light source, thereby reducing the reliability of the implemented lighting. This can be improved.

1 is a perspective view of a light conversion plate according to an embodiment of the present application.
2 is a cross-sectional view of a light conversion plate according to an embodiment of the present application.
3 is a schematic plan view illustrating a wavelength conversion region of a wavelength conversion layer.
4 is a perspective view of a lighting apparatus according to an embodiment of the present disclosure.
5 is a cross-sectional view taken along the line VV of FIG. 4.
6 and 7 are schematic cross-sectional views for explaining the configuration of the heat sink is added to the light conversion plate according to an embodiment of the present application.
8 is a schematic cross-sectional view of a backlight unit that is a lighting device according to another embodiment of the present application.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

Throughout this specification, when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. The terms "about "," substantially ", etc. used to the extent that they are used throughout the specification are intended to be taken to mean the approximation of the manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) "or" step "used to the extent that it is used throughout the specification does not mean" step for.

Throughout this specification, the term " combination thereof " included in the expression of the machine form means one or more combinations or combinations selected from the group consisting of the constituents described in the expression of the machine form, And the like.

For reference, terms related to a direction or a position (front, front, rear, rear, etc.) in the description of the embodiments of the present application are set with the direction in which the light is finally irradiated to the front. For example, in FIGS. 2 and 5 to 7, the overall upward direction is forward, the overall upward direction is the front, the overall downward direction is the rear, and the overall downward direction is the rear. And so on. However, in various practical applications of the embodiments of the present disclosure, the front may be arranged in various directions such as downwardly arranged.

The present invention relates to a reflective light conversion plate disposed to be spaced apart from the light source and a lighting device using the same.

First, a light conversion plate (hereinafter, referred to as a 'light conversion plate') 100 according to an embodiment of the present application will be described.

1 is a perspective view of a light conversion plate according to an embodiment of the present application, Figure 2 is a cross-sectional view of the light conversion plate according to an embodiment of the present application.

The light conversion plate 100 includes a wavelength conversion layer (1).

Referring to FIG. 1, the wavelength conversion layer 1 is disposed to be spaced apart from the light source 300 such that the front surface 11 faces the light source 300.

In addition, the wavelength conversion layer 1 may convert the wavelength of some of the light passing through. For example, referring to FIG. 1, some of the light emitted from the light source 300 and passing through the wavelength conversion layer 1 may reach and reflect back to the reflective layer 3 to be described later without converting the wavelength. However, the light re-reflected without wavelength conversion may be wavelength converted during re-reflection. In addition, other portions of the light passing through the wavelength conversion layer 1 may reach the reflective layer 3 with the wavelength converted and may be reflected back.

As such, the wavelength conversion layer 1 may include a wavelength conversion material (light conversion material) in order to convert the wavelength of some of the light passing through the wavelength conversion layer 1.

The wavelength conversion layer 1 may be formed of one or more materials of ceramic, resin, glass, polycarbonate (PC), and acrylic (PMMA). For example, the wavelength conversion layer 1 may be formed through a transparent resin material including a wavelength conversion material, wherein the transparent resin material may be silicon or epoxy, but is not limited thereto. It may be.

The representative example of the wavelength conversion material is a phosphor, and thus the wavelength conversion layer 1 may be a phosphor layer. For example, the wavelength conversion layer 1 may be formed by dispersing such a phosphor in a silicone gel or an epoxy. More specifically, the wavelength conversion layer 1 may be formed by dotting silicon containing a phosphor in a resin.

On the other hand, the light source 300 is not limited only when a light emitting diode (LED) is applied, but looking at the case of the light source 300 is a light emitting diode, for example, a yellow phosphor that the light emitting diode emitting blue light is a wavelength conversion material In combination with the white light emission can be achieved.

That is, the blue light emitted from the light source 300 passes through the wavelength conversion layer 1 while being emitted toward the reflection layer 3 or is reflected by the reflection layer 3 and then passes through the wavelength conversion layer 1, and part of the yellow phosphor is emitted. The yellow wavelength converting material is converted into the wavelength of the yellow light, and some do not pass through the yellow wavelength converting material to maintain the wavelength of the blue light. Accordingly, blue light and yellow light may be combined to realize white light emission.

As another example, two light sources 300 are provided, one of the two light sources 300 emits blue light, the other emits red light, and the wavelength conversion layer 1 is a yellow wavelength conversion material such as a yellow phosphor. In the case of including a combination of blue light and yellow light, and a combination of red light and yellow light, warm white light may be realized.

In addition, the wavelength conversion layer 1 may be provided in the form of a plate as shown in the figure. Meanwhile, the reflective layer 3 to be described later may be formed by, for example, coating a material having a high reflectance on the rear surface 13 of the wavelength conversion layer 1 provided in the form of a plate. As such, since the wavelength conversion layer 1 is provided in the form of a plate, the light conversion plate 100 may be provided in a single product that is manufactured separately.

In addition, the plate shape of the wavelength conversion layer (1) is not limited to the flat plate only, if necessary, provided with a curved plate having a predetermined radius of curvature, its applicability can be extended.

The wavelength conversion layer 1 may include a plurality of wavelength conversion materials of different types. In exemplary embodiments, the plurality of wavelength converting materials may be a yellow phosphor, a green phosphor, a red phosphor, or the like.

In addition, the plurality of wavelength conversion materials may be included in the wavelength conversion layer 1 in a mixed state. For example, at least two of the salping yellow phosphor, the green phosphor, and the red phosphor may be included in the wavelength conversion layer 1 in a mixed state. As such, when the wavelength conversion layer 1 includes a plurality of wavelength conversion materials mixed with each other, the type of light finally realized through the light conversion plate 100 may be a type of light emitted from the light source 300 (wavelength). , Color, etc.), the mixing ratio of the plurality of wavelength converting materials, the amount of each of the plurality of wavelength converting materials, and the like.

3 is a schematic plan view illustrating a wavelength conversion region of a wavelength conversion layer.

Meanwhile, the wavelength conversion layer 1 may be divided into a plurality of wavelength conversion regions 17. In this case, each of the plurality of wavelength conversion regions 17 may include one or more of the plurality of wavelength conversion materials.

For example, the wavelength conversion layer 1 may be divided into three wavelength conversion regions 17, and among the three wavelength conversion regions 17, a yellow phosphor and a second wavelength conversion region are included in the first wavelength conversion region 17. A green phosphor may be included in 17 and a red phosphor may be included in the third wavelength conversion region 17.

As another example, the wavelength conversion layer 1 may be divided into two wavelength conversion regions 17, and a yellow phosphor and a green phosphor are mixed in the first wavelength conversion region 17 of the two wavelength conversion regions 17. In the second wavelength conversion region 17, the yellow phosphor and the red phosphor may be mixed with each other, and the respective mixing ratios may be set differently in some cases.

When the wavelength conversion layer 1 is divided into a plurality of wavelength conversion regions 17 and wavelength conversion materials are separately disposed in each wavelength conversion region 17, wavelength conversion is uniformly performed in each region 17. Accordingly, the light efficiency may be improved than when the different types of wavelength conversion materials are mixed together and included in the wavelength conversion layer 1.

For example, the plurality of wavelength conversion regions 17 may include one or more center regions 171 formed at the center of the wavelength conversion layer 1 and one or more surrounding the central region 171 along the radial direction of the wavelength conversion layer. The peripheral area 173 may be included.

For example, as shown in FIG. 3, the wavelength conversion region 17 includes a central region 171 formed at the center of the wavelength conversion layer 1, and two peripheral regions 173 which sequentially surround the central region 171. It may include. In addition, each of the three wavelength conversion regions 17 may include different kinds of wavelength conversion materials or mixtures thereof.

As described above, the plurality of wavelength conversion regions 17 are formed to be sequentially separated from the center of the wavelength conversion layer 1 along the outer direction, so that the same wavelength conversion material is included on the same distance with respect to the center of the wavelength conversion layer 1. Thus, the combination between the light emitted from the light source 300 and the light converted through each wavelength converting material can be made more uniform, so that the finally combined light can be realized with light of more uniform color. have.

In addition, the light conversion plate 100 includes a reflective layer (3).

As shown in FIGS. 1 and 2, the reflective layer 3 is formed on the rear surface 13 of the wavelength conversion layer 1. Referring to FIG. 1, the reflective layer 3 reflects the light that has passed through the wavelength conversion layer 1 from the light source 300.

The direction in which the light is finally irradiated by using the light conversion plate 100 is the front surface of the wavelength conversion layer 1 which is the opposite side to the rear surface 13 of the wavelength conversion layer 1 in which the reflective layer 3 is formed. 11) may be referred to as a direction (upward with reference to FIGS. 1 and 2). Therefore, it is most preferable that such a reflection layer 3 totally reflects the reached light.

Accordingly, the reflective layer 3 may be formed of a high reflective material film having a high reflectance. Here, the highly reflective material film may be a film including one or more of DBR (distributed Bragg reflective film), TiO 2, BaSO 4, Al, and Ag, for example, formed on the rear surface 13 of the wavelength conversion layer 1 through coating. Can be.

As such, the reflective layer 3 is formed on the rear surface 13 of the wavelength conversion layer 1, and thus, the wavelength conversion layer 1 after being emitted from the light source and the light that is directly emitted to the reflective layer 3 without wavelength conversion. The light that has been wavelength-converted while passing through and then reaches the reflective layer 3 is reflected almost without passing through the reflective layer 3 according to the reflectance.

However, as described above, in the conventional direct lighting method, the light emitted from the LED is back scattered in the phosphor layer, causing a large light conversion loss, and the LED and the phosphor layer are directly connected to each other. Since it is disposed close to each other or adjacent to each other, the phosphor easily deteriorates due to the heat generated by the LED which easily reaches the phosphor and the heat generated by the phosphor quantum efficiency, and a large amount of light emitted from the LED is directly forward to the outside. Because of the characteristics of the direct lighting method, the LED spot (spot) is generated, there was a problem that causes glare.

On the other hand, as described above, the light source 300 is spaced apart from the front surface 11 of the wavelength conversion layer 1, and the reflective layer 3 having a high reflectance is formed on the rear surface 13 of the wavelength conversion layer 1. Even though the light emitted from the light source 300 reaches and reflects the reflective layer 3 and is back scattered again by the wavelength converting material, the reflective layer 3 is formed on the scattered rear side. Re-reflection can be achieved, so that light loss can be minimized, and thus higher light efficiency can be ensured even if a large number of light sources are not disposed.

In addition, since the light conversion plate 100 is spaced apart from the light source 300, the wavelength conversion material included in the wavelength conversion layer 1, for example, the wavelength conversion layer 1, may be damaged due to heat generation of the light source 300. There is an advantage that can be prevented.

In addition, since the light conversion plate 100 is an indirect illumination method in which the light source 300 is spaced apart from the light source 300 to perform wavelength conversion and reflection, the spot is not generated due to direct light irradiation, thereby preventing glare. have. In addition, the light conversion plate 100 is easy to be applied in one configuration for implementing a flat surface illumination due to the characteristics that such indirect lighting is implemented.

That is, according to the light conversion plate 100 and the lighting apparatus 1000 using the same, which will be described later, the light conversion loss may be eliminated and the emission of generated heat may be maximized to achieve reliable high efficiency lighting.

For reference, the reflective layer 3 may be formed by depositing a highly reflective material film on the wavelength conversion layer 1, or may be formed by bonding an Ag substrate or the like through a transparent paste. Alternatively, the reflective layer 3 may be formed by applying a resin containing TiO 2, Ag, or the like onto the wavelength conversion layer 1.

In addition, the light conversion plate 100 may include a reflection member 210.

Although not shown in FIGS. 1 to 3, which are views related to the light conversion plate 100, the reflective member 210 is a view related to a lighting device in which the light conversion plate 100 is used. For reference, a reflective surface 211 is formed on the inner surface of the reflective layer 3. In exemplary embodiments, the reflective surface 211 of the reflective member 210 may be formed by coating a material having a high reflectance.

Referring to the optical path shown schematically in FIG. 5, the reflective member 210 is a direction in which the light emitted from the light source 300 faces the front surface 11 of the wavelength conversion layer 1 (based on FIG. 5). Can be guided to up).

Meanwhile, hereinafter, a lighting device (hereinafter referred to as “the present lighting device”) 1000 according to an embodiment of the present application using the light conversion plate according to the embodiment of the present application will be described. However, the same reference numerals are used for the same or similar components as those described in the light converting plate according to the embodiment of the present invention, and the overlapping description will be briefly or omitted.

4 is a perspective view of a lighting apparatus according to an embodiment of the present application, Figure 5 is a cross-sectional view taken along the line V-V of FIG.

The present lighting device 1000 includes a light conversion plate 100 according to an embodiment of the present invention before salping.

In addition, the lighting device 1000 includes a frame 200.

The light conversion plate 100 is mounted on the frame 200, and an opening 201 is formed to face the front surface 11 of the wavelength conversion layer 1.

For example, referring to FIGS. 4 and 5, the frame 200 may be provided in a shell or a longitudinal shape in which a radius increases toward the front end. As shown in Figures 4 and 5, both the front end and the rear end of the shell or bell shape are open, and the light conversion plate 100 is mounted at the rear end thereof, and the opening 201 is maintained at the front end. Can be. Alternatively, only the front end of the shell or the longitudinal end may be opened to form the opening 201, and the light conversion plate 100 may be mounted inside the rear end.

In addition, the frame 200 is not limited to such a longitudinal shape, and may be provided in various shapes to increase the reflection efficiency toward the opening 201.

In addition, the light source 300 is mounted on the frame 200 so as to be spaced apart from the front surface 11 of the wavelength conversion layer 1.

That is, the lighting device 1000 may include a light source 300.

For example, the light source 300 may include one light emitting device in the form of a point light source, or may include a light emitting device package having a plurality of light emitting devices.

In addition, the light source 300 may further include a lens. The lens may be mounted to surround the mounted light emitting device through molding or attachment. The lens is disposed to adjust the directivity angle of the light emitted through the light emitting device, and may be manufactured in various shapes according to the required directivity angle characteristics. In exemplary embodiments, the lens may be formed in a shape such as a convex shape to reduce the amount of total reflection at the boundary surface in consideration of the emission waveform of light.

When the lens is mounted in this way, it is possible to easily consider the divergence path of the light from the light emitting device, it is possible to maximize the light efficiency more easily.

In addition, the light source 300 may include a mounting unit in which the light emitting device is mounted.

On the other hand, the frame 200 may include a reflective member 210 surrounding the periphery of the light conversion plate 100 to protrude in the direction of the opening 201 and the reflective surface 211 is formed on the inner surface.

For example, the shell or bell shape of the salping frame 200 may be mainly provided through the reflective member 210. However, the reflective member 210 is not limited to such a shell or a longitudinal shape, and may be provided in various shapes to increase the reflection efficiency toward the opening 201.

In addition, referring to the light path schematically illustrated in FIG. 5, the reflective member 210 may be a direction in which the light emitted from the light source 300 faces the front surface 11 of the wavelength conversion layer 1 (see FIG. 5). Can be guided forward). Meanwhile, the reflective surface 211 of the reflective member 210 may be formed by coating a material having a high reflectance.

4 and 5, the frame 200 may include a light source mounting part 230 protruding inward from the circumference of the opening 201. For example, referring to FIGS. 4 and 5, the light source mounting unit 230 may protrude in an inner radial direction from the circumference of the opening 201.

Alternatively, the light source mounting unit 230 may protrude into the opening 201 at a predetermined angle so that the efficiency of light emitted through the opening 201 is increased. For example, the light source mounting portion 230 may protrude from the circumference of the opening 201 to the inside of the opening 201, and may protrude obliquely outwardly from the area of the opening 201. The protruding inclination (angle) of the light source mounting unit 230 is preferably set in advance in a direction in which light efficiency increases.

4 and 5, the light source 300 is mounted on the inner surface 231 facing the light conversion plate 100. That is, the light source 300 is disposed to face rearward to the front surface 11 of the wavelength conversion layer 1 of the light conversion plate 100, so that the front through the wavelength conversion and reflection of light through the light conversion plate 100. Investigations can be made. In other words, it can be said that the light source 300 is mounted facing in the reverse direction to the front, which is the final irradiation direction of light through wavelength conversion and reflection.

For reference, when the light source 300 is disposed to face the front surface 11 of the wavelength conversion layer 1 toward the rear, the light source 300 is not only disposed to completely face each other, but also to the extent that wavelength conversion and reflection of light can be smoothly performed. It is meant to include the corresponding arrangement.

The light source mounting unit 230 may be provided in plural along the circumference of the opening 201. In addition, the plurality of light source mounting portions 230 may be provided at equal intervals along the circumference of the opening 201. For example, referring to FIGS. 4 and 5, four light source mounting portions 230 may be provided, and may be disposed at equal intervals of 90 degrees with respect to an angle formed from the center of the opening 201.

In addition, the light source mounting unit 230 may be provided as a metal plate. In addition, the light source mounting unit 230 may include a printed circuit board (PCB). 4 and 5, a portion of the frame 200 around the opening 201 through which the light source mounting portion 230 protrudes may also be provided with a metal material. In addition, the above-described reflective member 210 may also be provided with a metal material.

In addition, the light source mounting portion 230 may be provided transparently. For example, the light source mounting unit 230 may be a transparent substrate, and the transparent substrate may include a transparent electrode. As such, since the light source mounting unit 230 is provided transparently, the efficiency of light irradiated through the lighting device 1000 may be further improved. For reference, the light source mounting portion 230 is provided to be transparent is a concept including a semi-transparent provided to have a predetermined light transmittance.

6 and 7 are schematic cross-sectional views for explaining the configuration of the heat sink is added to the light conversion plate according to an embodiment of the present application.

The frame 200 may include a heat sink 250 provided outside the light source mounting unit 230. For example, as shown in FIG. 6, the heat sink 250 may be attached on the outer surface 233 of the light source mounting portion 230, and the heat sink 250 may have uneven parts exposed to the outside to improve heat dissipation efficiency. It may include.

Alternatively, the heat sink 250 may be provided integrally with the light source mounting unit 230 (230, 250). For example, as shown in FIG. 7, the uneven portion may be integrally formed on the outer surface of the light source mounting portion 230 to improve heat dissipation efficiency. Accordingly, the light source mounting portion 230 itself serves as a heat sink 250. can do.

The lighting device 1000 is a light source 300 is spaced forwardly with respect to the light conversion plate 100 bar heat emitted from the light source 300 is easily transmitted to the outside without being transmitted to the light conversion plate 100 Has the effect to be. For example, when the light source 300 is mounted on the inner surface 231 of the light source mounting unit 230, heat emitted from the light source 300 is transmitted to the outer surface 233 through the light source mounting unit 230 and is released to the outside. This heat can be easily dissipated through external convection. Furthermore, as described above, since the heat sink 250 is provided on the outside of the light source mounting unit 230, the discharge and dispersion of heat emitted from the light source 300 may be more maximized.

In addition, the lighting device 1000 may include a power supply 400 electrically connected to the light source 300 to provide power to the light source 300.

For example, the power supply unit 400 may include a switched-mode power supply (SMPS) for supplying power to the light source 300 and a base electrode part for applying external power to the SMPS. For example, the base electrode unit may apply an external 110V or 220V power source to the SMPS, and the SMPS may convert the applied power source into a constant voltage and an electrodeless power source and supply the same to a light source such as a light emitting diode (LED). In addition, although not clearly shown in the drawings, the base electrode portion and the SMPS, and the SMPS and the light source 300 are each electrically connected.

Since the structure and function of the base electrode unit and the SMPS itself are obvious to those skilled in the art, detailed description thereof will be omitted.

Meanwhile, hereinafter, a backlight unit (hereinafter, referred to as the “backlight unit”), which is a lighting device according to another embodiment of the present application using the light conversion plate according to the embodiment of the present application, will be described. However, the same reference numerals are used for the same or similar components as the above-described salping configuration, and redundant descriptions will be briefly or omitted.

8 is a schematic cross-sectional view of a backlight unit that is a lighting device according to another embodiment of the present application.

Referring to FIG. 8, the backlight unit includes a light conversion plate 100 according to an embodiment of the present invention. In addition, the backlight unit includes a frame on which the light source 300 is mounted to be spaced apart from the front surface 11 of the light conversion plate 100, and specifically, includes a light source mounting part 230. In addition, the backlight unit includes a light guide part 500 that guides a path of light emitted from the light source 300 and reflected by the reflective layer 3 so that light is irradiated upward with reference to FIG. 8.

For example, referring to FIG. 8, the light source 300 is mounted on the inner surface 231 of the light source mounting unit 230. In this case, the inner surface 231 of the light source mounting part 230 is illustrated in FIG. 8 so that the light emitted from the light source 300 may be converted into and reflected through the light conversion plate 100 to enter the light guide part 500. As shown, it may be provided at an angle with respect to the light conversion plate 100. In addition, although not shown in the drawing, a heat sink as described above may be attached to the outer surface 233 of the light source mounting portion 230, and the light source mounting portion 230 itself may serve as a heat sink.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1000: lighting device 100: light conversion plate
Wavelength converting layer 11: front
13: back side 17: wavelength conversion region
171: center region 173: circumference region
3: reflective layer 200: frame
201: opening 210: reflecting member
211: reflection surface 230: light source mounting portion
231: inside 233: outside
250: heat sink (H / S) 300: light source
400: power supply unit 500: light guide unit

Claims (21)

In the light conversion plate,
A wavelength conversion layer spaced apart from the light source such that a front surface thereof faces the light source; And
It includes a reflective layer formed on the back of the wavelength conversion layer,
The reflective layer is a light conversion plate for reflecting the light reached through the wavelength conversion layer from the light source. The method of claim 1,
The reflective layer is a light conversion plate for total reflection of the reached light. The method of claim 1,
The wavelength conversion layer is a light conversion plate to convert the wavelength of some of the light passing through. The method of claim 3,
The wavelength conversion layer is a light conversion plate comprising a wavelength conversion material. 5. The method of claim 4,
The wavelength conversion layer is a light conversion plate comprising a plurality of different wavelength conversion material. The method of claim 5,
And the plurality of wavelength conversion materials are included in the wavelength conversion layer in a mixed state. The method of claim 5,
The wavelength conversion layer is divided into a plurality of wavelength conversion regions,
And each of the plurality of wavelength conversion regions includes one or more of the plurality of wavelength conversion materials. The method of claim 7, wherein
The plurality of wavelength conversion regions include a center region formed at the center of the wavelength conversion layer and one or more peripheral regions sequentially surrounding the center region in a radial direction of the wavelength conversion layer. 5. The method of claim 4,
The wavelength conversion material is a light conversion plate phosphor. The method of claim 1,
And a reflective member formed around an inner surface of the reflective layer to guide the light emitted from the light source toward the front side of the wavelength conversion layer. In a lighting device,
Light conversion plate according to claim 1; And
And a frame on which the light conversion plate is mounted and an opening is formed to face the front surface of the wavelength conversion layer.
The light source is mounted on the frame so that the light source is spaced apart from the front surface of the wavelength conversion layer. The method of claim 11,
Lighting device further comprising the light source. The method of claim 12,
The plurality of light sources are mounted on the frame,
And the plurality of light sources have different wavelengths. The method of claim 11,
The frame includes a reflecting member that surrounds the circumference of the light conversion plate to protrude in the direction of the opening and a reflective surface is formed on the inner surface. The method of claim 11,
The frame includes a light source mounting portion protruding inward from the circumference of the opening,
The light source mounting portion is the lighting device is mounted on the inner surface facing the light conversion plate. 16. The method of claim 15,
The frame further includes a heat sink provided on the outside of the light source mounting portion. 17. The method of claim 16,
The heat sink is provided with an integrated light source mounting portion. 16. The method of claim 15,
The light source mounting portion is provided with a plurality along the circumference of the opening. 19. The method of claim 18,
The plurality of light source mounting portion is provided with an equal interval along the circumference of the opening. 16. The method of claim 15,
The light source mounting portion is provided with a transparent. 16. The method of claim 15,
The light source mounting portion is projected to the inside of the opening at a predetermined angle to increase the efficiency of the light emitted through the opening.
KR1020110144321A 2011-12-28 2011-12-28 Light conversion plate and illumination device using the same KR20130075970A (en)

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