KR20160120910A

KR20160120910A - Lighting apparatus capable of adjusting color temperature

Info

Publication number: KR20160120910A
Application number: KR1020150050082A
Authority: KR
Inventors: 김한석; 김철회
Original assignee: (주)하델시스
Priority date: 2015-04-09
Filing date: 2015-04-09
Publication date: 2016-10-19

Abstract

According to one aspect of the present disclosure, there is provided a color temperature controllable illumination device capable of changing the color temperature of a lighting device using a dimming circuit, A plurality of LED die; A power supply substrate on which the plurality of LED dies are directly mounted; A dam disposed at a predetermined height on the power-transmitting substrate, the dam being formed as a closed loop in which the plurality of LED dies are disposed; And a second region in which the first white light having the first color temperature is emitted, the first region including a first group selected from the plurality of LED dies and not including the second group except for the first group, A first wavelength conversion member provided; Wherein the first color temperature is lower than the first color temperature and the second color temperature is lower than the first color temperature, wherein the second color temperature is lower than the first color temperature, A wavelength conversion member; And a color temperature controller for controlling the color temperature of the mixed light in which the first and second white light are mixed by selectively controlling intensity of the first white light and the second white light by an AC input, A lighting device is provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lighting apparatus,

The present disclosure relates to an illumination device, and more particularly, to an illumination device capable of adjusting a color temperature by changing a color temperature of an illumination device using a light emitting diode (LED) by using a dimming circuit .

Herein, the background art relating to the present disclosure is provided, and these are not necessarily meant to be known arts.

In general, a light emitting diode (hereinafter, referred to as 'LED') is basically composed of a p-type and an n-type semiconductor junction. When a voltage is applied, a band gap of a semiconductor Is a kind of photoelectronic device that emits energy in the form of light.

Most white light LEDs used in lighting use LED die and wavelength converters that emit short wavelengths (blue, purple or ultraviolet), which absorb light from the die to produce longer wavelengths of secondary light Lt; / RTI >

Thus, such diodes emit light of two or more wavelengths, and these two or more lights appear white when coupled.

Most conventional wavelength converter materials are referred to as phosphors that exhibit luminescence when they absorb energy from other light sources.

White light is typically described by its color temperature, which is the temperature at which the perfect black body emits the same spectrum (Kelvin).

White LEDs available on the market today have two main color temperature variations: cool white (5000-6500K) and warm white (3200-4000K). All of these LEDs are based on the phosphor-converted blue LED.

Current LED-based solutions for varying color temperature,

(1) use two separate LEDs (one warm white, one cool white) all driven at different intensities.

In this case, an optical integration means is required to mix the two color temperatures together and will have a color temperature somewhere between the two extreme temperatures of both LEDs.

(2) cold white LEDs use two separate LEDs (one cool white, one amber) driven at its peak intensity.

In this case, yellow is gradually added to move the color temperature effect to white.

On the other hand, US 2002/0048177 discloses an LED arrangement for generating white light capable of adjusting the color temperature.

Such an LED arrangement includes one or more white LEDs and one or more color LEDs.

The light output from the color LED is combined with the white light to produce the resulting light with the desired color temperature.

The intensity of the color light output is adjustable by the user to change the color temperature of the resulting light.

One disadvantage of the prior art solution is that there is always a separate integration means to properly mix the colors since the light does not come from a single source.

Separate integration means make the device larger, which makes it more difficult to configure the color to best mix.

When smaller or smaller optically designed integration chambers are used, the individual colors will not be completely mixed and thus can be distinguished.

Thus, there is a need for an improved white light LED that is simple and can be easily adjusted to produce white light of a desired color temperature.

It is an object of the present disclosure to provide a lighting apparatus capable of adjusting a color temperature, which can be used by changing a color temperature of a lighting apparatus using a dimming circuit.

SUMMARY OF THE INVENTION Herein, a general summary of the present disclosure is provided, which should not be construed as limiting the scope of the present disclosure. of its features).

According to one aspect of the present disclosure, a plurality of LED die; A power supply substrate on which the plurality of LED dies are directly mounted; A dam disposed at a predetermined height on the power-transmitting substrate, the dam being formed as a closed loop in which the plurality of LED dies are disposed; And a second region in which the first white light having the first color temperature is emitted, the first region including a first group selected from the plurality of LED dies and not including the second group except for the first group, A first wavelength conversion member provided; Wherein the first color temperature is lower than the first color temperature and the second color temperature is lower than the first color temperature, wherein the second color temperature is lower than the first color temperature, A wavelength conversion member; And a color temperature controller for controlling the color temperature of the mixed light in which the first and second white light are mixed by selectively controlling intensity of the first white light and the second white light by an AC input, A lighting device is provided.

In the lighting apparatus capable of adjusting the color temperature according to the present disclosure, the color temperature controller selectively adjusts the magnitude of the current supplied to the first group and the second group of LED dies while keeping the total current size constant .

The illuminating device according to the present disclosure may further include a dividing dam provided on the power-transmitting substrate to divide the first and second regions.

In the illumination device capable of adjusting the color temperature according to the present disclosure, the color temperature controller may include: an AC direct-coupled IC device that receives an AC current input from the outside; and a controller that controls the amount of current distributed from the AC direct- And a dimming element for controlling the dimming element.

The plurality of LED dies may be GaN-based light emitting diodes that emit light having a peak wavelength of 410 nm to 470 nm.

In the illuminating device capable of adjusting the color temperature according to the present disclosure, the dam is provided in a circular shape, and the first and second areas are each provided in a semicircle.

In the illuminating device capable of adjusting the color temperature according to the present disclosure, the dam is provided in a circular shape, and the first and second areas are provided concentrically and are provided in the same area.

In the illuminating device capable of adjusting the color temperature according to the present disclosure, the dam is provided in a circular shape, and the first and second areas are alternately arranged at least twice in the circumferential direction of the dam.

The first and second regions are provided in the same size and shape, and the plurality of LED dies are arranged in the same number in the first and second regions, 1 and 2, respectively.

According to the illumination device capable of adjusting the color temperature according to the present disclosure, a COB (Chip on Board) type packaging in which a plurality of LED dies are directly mounted on a power supply substrate, a plurality of LED dies It is not necessary to have a separate structure for mixing the white light emitted through the first and second regions.

Further, when LED dies having different peak wavelengths are used, it is difficult to differentiate them, but according to the present disclosure, it is possible to eliminate such difficulties by using a plurality of LED dies having similar peak wavelengths.

In addition, since the magnitude of the current supplied to the LED die of the first group and the second group is adjusted while the total current is kept constant, the color temperature of the mixed light is continuously changed from the first color temperature to the second color temperature .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a lighting device capable of color temperature control according to an embodiment of the present disclosure;
2 is a diagram showing a lighting device capable of adjusting a color temperature according to an embodiment of the present disclosure;
FIG. 3 is a view showing a modification of FIG. 1,
4 is a view showing a modification of Fig. 2 and Fig.
Fig. 5 is a view showing another modification of Fig. 2. Fig.

The present disclosure will now be described in detail with reference to the accompanying drawings.

However, the present invention is not limited to these embodiments. For example, the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit and scope of the present invention. It should be understood that the embodiments described herein are to be understood as the embodiments disclosed herein.

The terms used in this specification and claims are to be understood by the inventor as a concept selected for the convenience of explanation and should not be construed in a linguistic sense in understanding the meaning thereof but should be appropriately interpreted in accordance with the technical idea of the present disclosure will be.

FIG. 1 is a cross-sectional view of a lighting device capable of adjusting a color temperature according to an embodiment of the present disclosure, and FIG. 2 is a drawing showing a lighting device capable of adjusting a color temperature according to an embodiment of the present disclosure.

1 and 2, the temperature controllable illumination device 100 according to the present embodiment includes a plurality of LED dies 110, a power supply substrate 120, a dam 130, Members 140 and 150, and a color temperature controller 160. [

The plurality of LED die 110 is preferably a blue LED die, and the material may be selected from InGaN (indium gallium nitride) and GaN (gallium nitride).

Herein, the term "LED die" refers to a semiconductor material having the ability to produce visible light or invisible light, and is a chip manufactured by cutting from a wafer.

In the present disclosure, a plurality of LED dies 110 are LED diodes that are provided with a similar range of peak wavelengths and emit light having peak wavelengths of 410 nm to 470 nm, preferably blue light. It is needless to say that an LED die emitting purple or ultraviolet light may be used.

Unlike the present invention, a technique of controlling the color temperature by using various kinds of LED dies emitting different colors has been disclosed. Specifically, a technique of controlling the color temperature by adjusting the light emission intensity of the yellow LED, , There is a damage problem to the rendition of the LED color.

A plurality of LED dies 110 may be mounted on a power supply board in a state of being packaged in a separately mounted mounting frame, Is mounted directly on the power-transmitting substrate 120.

The power supply substrate 120 refers to a plate having a circuit for supplying power to a plurality of LED dies 110. Typically, it means a printed circuit board (PCB).

The dam 130 is formed on the power supply substrate 120 and serves as a reflective barrier that guides light emitted from the plurality of LED dies 110 to be extracted in a direction perpendicular to the power supply substrate 120 And functions to prevent the liquid wavelength conversion members 140 and 150, which will be described later, from freely flowing over the power supply substrate 120.

The dam 130 may be provided with any one of barium sulphate, calcium carbonate, titanium oxide, magnesium carbonate, alumina, magnesium hydroxide and zinc oxide for effective refractory barrier function and the dam 130 may be applied by a coating or screen printing technique As shown in FIG.

In this embodiment, the dam 130 is formed as a closed loop in which a plurality of LED dies 110 are disposed. That is, a plurality of LED dies 110 are mounted inside the dam 130.

Further, in the present embodiment, the plurality of LED dies 110 are sealed or encapsulated by two types of wavelength conversion members 140 and 150.

Here, 'wavelength converting member' is a material having the ability to change the color of emitted light by converting one (monochromatic) wavelength to another wavelength.

The wavelength converting member is generally referred to as a phosphor.

Conventionally used phosphors consist of an inorganic host substance containing an optically active dopant.

Yttrium aluminum garnet (YAG) is a common host material and, for diode applications, is typically doped with either a rare-earth element or a rare earth compound.

Cerium is a common impurity in YAG phosphors designed for white light emitting diodes.

Examples of the phosphor for use in this embodiment are yttrium-aluminum-garnet doped with cerium, praseodymium, europium or a combination thereof, and examples thereof include (YAG: Ce), (YAG: Ce, Pr) Ce, Eu). Non-YAG based phosphors may also be used.

In the present embodiment, the plurality of LED dies 110 are divided into two groups, a first group 111 and a second group 112, and each group includes wavelength conversion members 140 and 150 of different types, As shown in Fig.

That is, the inside of the dam 130 is divided into two regions, that is, a first region 141 and a second region 151.

The first region 141 is a region that emits white light having a relatively high color temperature (for example, 5700 K to 10000 K), and the color temperature of the white light emitted is the first wavelength 141 for sealing or encapsulating the first region 141 Is determined by the conversion member (140, 150).

On the other hand, the second region 151 is a region for emitting white light having a relatively low color temperature (for example, 1500K to 3000K), and the color temperature of the emitted white light is a second region 151 for sealing or sealing the second region 151 Is determined by the wavelength converting member (140, 150).

The inventors of the present invention have found that the first wavelength conversion member (140, 150) obtained by mixing 90:10 product name GAL535 manufactured by Intematix Corporation and BR-102D manufactured by Mitsubishi Corporation with a color temperature of 5700K White light having a color rendering index (CRI) of 80 and a color temperature of 2700K was obtained from the second wavelength conversion member 140 and 150 obtained by mixing 75:25 product name of product GAL535 manufactured by Intematix and product name BR-102D manufactured by Mitsubishi .

On the other hand, in the present embodiment, the color temperature of the mixed light in which the two white light beams are mixed can be adjusted by using white light of different color temperature formed by the two types of wavelength conversion members 140 and 150. This is accomplished by adjusting the amount of current supplied to the LED dies 111, 112 disposed in each area.

The color temperature controller 160 controls the color temperature of the mixed light by controlling the amount of current supplied to the plurality of LED dies 110 disposed in the first and second areas 141 and 151 by the AC input.

More specifically, the color temperature controller 160 selectively adjusts the magnitude of the current supplied to the LED dies 111 and 112 belonging to the first group 111 and the second group 112 while keeping the total current size constant. .

As a result, when the output of light generated in the LED die belonging to the first and second groups 111 and 112 is changed, the output of the white light emitted from the first and second regions 141 and 151 is changed.

Therefore, the color temperature of the mixed light is controlled.

To this end, the color temperature regulator 160 of the present embodiment includes an AC direct-coupled IC element 161 that receives an AC current input from the outside, an AC direct-coupled IC element 161 that receives an amount of current And a dimming element 162 for controlling the liquid crystal display device.

On the other hand, in the present embodiment, the dam 130 is provided in a circular shape, and the first and second regions 141 and 151 may be respectively provided in a semicircle.

According to the illumination device 100 capable of adjusting the color temperature according to the present embodiment described above, since the plurality of LED dies are provided in the COB (Chip on Board) type in which they are directly mounted on the power supply substrate, The spacing between the plurality of LED dies can be relatively narrow, so that a separate configuration for mixing the white light emitted through the first and second regions is not required.

Further, when a plurality of LED dies having different peak wavelengths are used, it is difficult to arrange them separately, but according to this embodiment, it is possible to eliminate such difficulties by using a plurality of LED dies having similar peak wavelengths.

Further, in the present embodiment, since the magnitude of the current supplied to the first and second groups of LED dies is adjusted while the total current is kept constant, the color temperature of the mixed light is changed from the color temperature of the first region The color temperature of the second region can be continuously changed.

Fig. 3 is a view showing a modification of Fig. 1. Fig.

Referring to FIG. 3, in the lighting apparatus 100 capable of adjusting the color temperature according to the embodiment described above, a partition dam 131 (see FIG. 3) ) May be further provided.

According to this, it is easy to form the first and second wavelength converting members in the first and second regions by the partition dam.

However, since the partition dam 131 may interfere with the mixing of the white light generated in the first and second areas 141 and 151, it is preferable that the width is smaller than the width of the dam 130 described above.

FIG. 4 is a view showing a modification of FIG. 2. FIG.

Referring to FIG. 4, in the illumination device 100 capable of adjusting the color temperature according to the embodiment described above, the dam 130 is provided in a circular shape, and the first and second areas 141 and 151 are provided in a concentric shape , And the same area.

Here, the first region 141 having a relatively high color temperature is located at the center, and the second region 151 is disposed around the first region 141 and the second region 151 for effective mixing of the white light emitted from the first and second regions 141 and 151 desirable.

Fig. 5 is a view showing another modification of Fig. 2. Fig.

Referring to FIG. 5, in the illumination device 100 capable of adjusting the color temperature according to the embodiment described above, the dam 130 is provided in a circular shape, They are alternately arranged at least twice in the circumferential direction.

Here, the first and second regions 141 and 151 are provided in the same size and shape, and the plurality of LED dies 110 are arranged in the same number in the first and second regions 141 and 151, It is desirable for effective mixing.

Claims

A plurality of LED die;
A power supply substrate on which the plurality of LED dies are directly mounted;
A dam disposed at a predetermined height on the power-transmitting substrate, the dam being formed as a closed loop in which the plurality of LED dies are disposed;
And a second region in which the first white light having the first color temperature is emitted, the first region including a first group selected from the plurality of LED dies and not including the second group except for the first group, A first wavelength conversion member provided;
Wherein the first color temperature is lower than the first color temperature and the second color temperature is lower than the first color temperature, wherein the second color temperature is lower than the first color temperature, A wavelength conversion member; And
And a color temperature controller for controlling the color temperature of the mixed light in which the first and second white light are mixed by selectively controlling the intensities of the first white light and the second white light by an AC input, Device.

The method according to claim 1,
Wherein the color temperature controller selectively adjusts a magnitude of a current supplied to the first group and the second group of LED dies while maintaining a constant total current size.

The method according to claim 1,
And a partitioning dam provided on the power-transmitting substrate and partitioning the first and second regions.

The method according to claim 1,
Wherein the color temperature controller includes an AC direct-coupled IC element that receives an AC current input from the outside and a dimming element that controls an amount of current distributed from the AC direct-coupled IC element. This possible lighting device.

The method according to claim 1,
Wherein the plurality of LED dies are provided as GaN-based light emitting diodes that emit light having a peak wavelength of 410 nm to 470 nm.

The method according to any one of claims 1 to 5,
Wherein the dam is provided in a circular shape,
Wherein the first and second regions are each provided in a semicircle.

The method according to any one of claims 1 to 5,
Wherein the dam is provided in a circular shape,
Wherein the first and second regions are provided concentrically and have the same area.

The method according to any one of claims 1 to 5,
Wherein the dam is provided in a circular shape,
Wherein the first and second regions are alternately arranged at least twice in the circumferential direction of the dam.

The method according to any one of claims 1 to 5,
The first and second regions are provided in the same size and shape,
Wherein the plurality of LED dies are disposed in the same number in the first and second regions and are disposed at the same positions in the first and second regions.