KR20110113676A - Lighting device and control method of lighting device - Google Patents

Abstract

The lighting apparatus of the present invention includes at least one first light source and a second light source that emit light having different color temperatures and different color coordinates, and at least one agent that emits light different from the color coordinates and color temperature of the first and second light source parts. 3 outputting an R component signal, a G component signal, and a B component signal corresponding to an amount of light of each of the R, G, and B components of light output from the light source unit, the first light source unit, the second light source unit, and the at least one light source unit; The color coordinates of the light output from the first light source, the second light source and the at least one third light source are included in an area consisting of color coordinates of the RGB sensing unit, the first light source, the second light source, and the at least one third light source. A control unit controlling an amount of light of the first light source unit, the second light source unit, and the at least one third light source unit to be positioned; 1, a light source, a second light source unit and a power supply for supplying a voltage for changing the one or more light amount of the third light source.

Description

LIGHTING DEVICE AND METHOD FOR CONTROLLING THE SAME}

This embodiment relates to a lighting device and a method of controlling the lighting device.

Recently, interest in lighting devices has increased. Lighting devices are installed in specific places and need to emit light for a long time. Therefore, the user of the lighting device wants to keep the characteristics of the lighting device, such as luminous for light emitted from the lighting device, for a long time. If the characteristics of the lighting device are not kept constant, users may be affected by eye fatigue or activities using the lighting device.

In addition, various national and international standards are considered in the manufacture of lighting devices. That is, the lighting device is manufactured in accordance with national and international standards. As such, even if the lighting apparatus is manufactured according to various standards, the light emitted from the lighting apparatus during long time operation after installation must meet the specifications.

This embodiment is to provide a lighting device for controlling the color coordinates of the light to be located within a certain area.

The technical problems to be achieved by the present embodiment are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

According to the present embodiment, the first light source unit and the second light source unit emitting light having different color temperatures and different color coordinates, and the one or more third light source units emitting light different from the color coordinates and color temperature of the first light source unit and the second light source unit. RGB sensing for outputting an R component signal, a G component signal, and a B component signal corresponding to an amount of light of each of the R, G, and B components of light output from the first light source, the second light source, and the at least one light source The color coordinates of light output from the first light source unit, the second light source unit and the at least one third light source unit may be positioned in an area including color coordinates of each of the first light source unit, the second light source unit, and the at least one third light source unit. A control unit controlling an amount of light of the first light source unit, the second light source unit and the at least one third light source unit, and the first light source unit under the control of the control unit; And a power supply unit supplying a voltage for changing an amount of light of the second light source unit and at least one third light source unit.

The RGB sensing unit may include an R filter, a G filter, and a B filter.

The plurality of third light source units may emit lights having different color temperatures and color coordinates.

The first light source unit and the second light source unit may emit white light.

The power supply unit may supply an AC voltage having a controlled duty ratio under the control of the controller.

The first light source unit, the second light source unit and the at least one third light source unit may include an LED, and the LED may change the amount of light depending on the duty ratio of the AC voltage.

The lighting apparatus of the present embodiment includes at least one first light source and a second light source that emit light having different color temperatures and different color coordinates, and at least one agent that emits light different from the color coordinates and color temperature of the first light source unit and the second light source unit. 3 outputting an R component signal, a G component signal, and a B component signal corresponding to an amount of light of each of the R, G, and B components of light output from the light source unit, the first light source unit, the second light source unit, and the at least one light source unit; A memory unit for storing reference color coordinates located in an area consisting of color coordinates of an RGB sensing unit, the first light source unit, the second light source unit, and the at least one third light source unit, an R component signal, a G component signal, and Generates a comparison color coordinate by receiving a B component signal and compares the reference color coordinate with the reference color coordinate read from the memory unit. A control unit controlling an amount of light of the first light source unit, the second light source unit, and the at least one third light source unit to reduce an error value from a color coordinate, and the first light source unit, the second light source unit, and the at least one second unit under the control of the control unit. And a power supply unit for supplying a voltage for changing the amount of light in the light source unit.

The reference color coordinates may be set according to a blackbody radiation curve, a McAdam curve or an ancivin curve.

The plurality of third light source units may emit lights having different color temperatures and color coordinates.

The first light source unit and the second light source unit may emit white light.

The power supply unit may supply an AC voltage having a controlled duty ratio under the control of the controller.

The first light source unit, the second light source unit and the at least one third light source unit may include an LED, and the LED may change the amount of light depending on the duty ratio of the AC voltage.

The color distribution at each color temperature of light emitted from the first light source unit, the second light source unit and the at least one third light source unit may be within Step 3.

The control method of the lighting apparatus of the present invention includes an R component signal, a G component signal corresponding to an amount of light of each of the R, G, and B components of light output from the first light source unit, the second light source unit, and the at least one light source unit, and Outputting a B component signal, generating a comparison color coordinate by receiving the R component signal, the G component signal, and the B component signal, and generating a color coordinate of each of the first light source unit, the second light source unit, and the one or more third light source units. Controlling the amount of light of the first light source unit, the second light source unit, and the at least one third light source unit to reduce the error value between the reference color coordinate and the comparison color coordinate by comparing the reference color coordinates positioned in the region with the comparison color coordinates. It includes.

The reference color coordinates may be set according to a blackbody radiation curve, a McAdam curve or an ancivin curve.

The plurality of third light source units may emit lights having different color temperatures and color coordinates.

The first light source unit and the second light source unit may emit white light.

The amount of light may be controlled by supplying an alternating current voltage having a duty ratio adjusted.

The color distribution at each color temperature of light emitted from the first light source unit, the second light source unit and the at least one third light source unit may be within Step 3.

According to the present embodiment, the color coordinates of the light of the lighting apparatus may be positioned in an area formed of the color coordinates of the light source units.

1 shows a lighting apparatus according to an embodiment of the present invention.
2A shows the CIE 1931 color coordinate system.
2B shows part of the CIE 1931 color coordinate system.
3A illustrates color temperature and color coordinate changes when the lighting apparatus includes only the first light source unit and the second light source unit.
3B illustrates color temperature and color coordinate changes of the lighting apparatus according to the embodiment of the present invention.
4A and 4B illustrate reference color coordinate settings and operation of a lighting apparatus according to an embodiment of the present invention in consideration of the McAdam curve and the Annecy-empty curve.
5 shows a lighting device according to another embodiment of the present invention.
6 shows an operation of a lighting device according to another embodiment of the present invention.

Next, a lighting apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 shows a lighting apparatus according to an embodiment of the present invention. As shown in FIG. 1, the lighting apparatus according to the exemplary embodiment of the present invention includes a first light source unit 110, a second light source unit 130, and at least one third light source unit 150, an RGB sensing unit 200, and a controller 300. ) And the power supply unit 400. The lighting apparatus shown in FIG. 1 includes one third light source unit 150 together with the first light source unit 110 and the second light source unit 130, and the lighting apparatus illustrated in FIG. 5 described later includes a first light source unit. In addition to the 110 and the second light source unit 130, the plurality of third light source units 150a and 150b are included.

The first light source 110 and the second light source 130 emit light having different color temperatures and different color coordinates. That is, the first light source unit 110 emits light having a first color temperature and a first color coordinate, and the second light source unit 130 emits light having a second color temperature and a second color coordinate different from the first color temperature and the first color coordinate. Release. Since the embodiment of the present invention is a lighting device, the first light source unit 110 and the second light source unit 130 may emit white light.

The at least one third light source unit 150 emits light different from the color temperature and color coordinates of the first light source unit 110 and the second light source unit 130. The third light source unit 150 may include LEDs emitting light different from the color temperature and color coordinates of the first light source unit 110 and the second light source unit 130.

The RGB sensing unit 200 is an R component corresponding to the amount of light of each of the R (red) component, G (green) component, and B (blue) component of the light output from the first light source unit 110 to the third light source unit 130. A signal, a G component signal, and a B component signal are output. That is, the RGB sensing unit 200 senses the amount of light of each of the R (red) component, the G (green) component, and the B (blue) component of light in which the light emitted from the plurality of light source units is mixed.

In order to detect an R (red) component, a G (green) component, and a B (blue) component of light, the RGB sensing unit 200 may include an R filter, a G filter, and a B filter. The R filter, G filter, and B filter pass the corresponding components. That is, the R filter passes the R component, the G filter the G component, and the B filter the B component.

In this case, the RGB sensing unit 200 may include an analog / digital converter (not shown) for converting an analog signal into a digital signal. When the analog / digital converter is included, the first light quantity signal, the second light quantity signal, and the third light quantity signal may be digital signals.

The controller 300 may include the first light source unit 110, the second light source unit 120, and the one or more light sources within a region consisting of color coordinates of each of the first light source unit 110, the second light source unit 120, and the one or more third light source units 130. The amount of light of the first light source unit 110, the second light source unit 130, and the one or more third light source units 150 is controlled so that the color coordinates of the light output from the third light source unit 150 are located. The operation of the controller 300 will be described in detail later.

The power supply unit 400 supplies a voltage for changing the amount of light of the first light source unit 110, the second light source unit 130, and the one or more third light source units 150 under the control of the controller 300.

At this time, the power supply unit 400 may supply an alternating current voltage of which the duty ratio is adjusted to the first light source unit 110 to one or more third light source units 150 under the control of the controller 300. To this end, the power supply unit 400 may include a pulse width modulation (PWM) generator. The first light source unit 110, the second light source unit 130, and the one or more third light source units 150 may include an LED, and the LED may change the amount of light depending on the duty ratio of the AC voltage.

2A shows C.I.E. 1931 color coordinate system, Figure 2b is a C.I.E. 1931 Represents a part of a color coordinate system.

The lighting apparatus according to the embodiment of the present invention can increase the area to adjust the color coordinates. That is, unlike the embodiment of the present invention, when the lighting device includes only the first light source 110 and the second light source 130, the color coordinates of the light of the lighting device are the color coordinates of the first light source 110 and the second light source 130. ) Changes along a straight line connecting the color coordinates.

On the other hand, the lighting apparatus according to the embodiment of the present invention includes at least one third light source unit 150 together with the first light source unit 110 and the second light source unit 130. The RGB sensing unit 200 outputs an R component signal, a G component signal, and a B component signal of light output from the first light source unit 110 to the third light source unit 130.

The controller 300 calculates tristimulus values X, Y, and Z using the R component signal, the G component signal, and the B component signal. The calculation of the tristimulus values X, Y and Z is done using the color matching function for the R, G and B components, as well as the surface defined by the type of illumination on the object, the reflectance. Can be.

The controller 300 calculates the color coordinates of the light emitted by the light source units through the tristimulus values X, Y, and Z. The color coordinate x is calculated by X / (X + Y + Z), the color coordinate y is calculated by Y / (X + Y + Z) and z can be calculated by 1- (x + y).

In the embodiment of the present invention, the control unit 300 has been described that the calculation of the tristimulus value, the calculation of the color coordinates, etc. sequentially, but when the R component signal, the G component signal and the B component signal input, the corresponding color coordinate values are previously input to the controller 300. It may be stored.

If the calculated color coordinates deviate from the region consisting of the color coordinates of each of the first light source unit 110, the second light source unit 120, and the one or more third light source units 130, the first light source unit 110 to the third light source unit. The amount of light 150 is controlled so that the light of the lighting device is located in the area.

Accordingly, in the lighting apparatus according to the embodiment of the present invention, as shown in FIG. 2B, the triangle consists of color coordinates of the first light source unit 110, color coordinates of the second light source unit 130, and color coordinates of the third light source unit 150. It can emit light with color coordinates located in its interior area.

According to an exemplary embodiment of the present invention, the lighting apparatus may include color coordinates of the first light source unit 110, color coordinates of the second light source unit 130, and reference color coordinates positioned in an inner region including color coordinates of the one or more third light source units 150. You can adjust the amount of light.

To this end, the lighting apparatus according to the embodiment of the present invention may further include a memory unit 500. The memory unit 500 stores reference color coordinates. Reference color coordinates will be described with reference to the drawings. C.I.E. The black body radiation curve is shown in the 1931 color coordinate system. Blackbody radiation curves are intended to represent the color temperature of a light source and are an international standard for the color temperature of lighting devices.

The reference color coordinates of the memory unit 500 may be color coordinates of some points on the black body radiation curve, or color coordinates of some points close to the black body radiation curve.

During the manufacturing process of the lighting apparatus, the amount of light of the first to third light source units 110, 130, and 150 is changed to obtain a reference color coordinate through the color coordinates of the light emitted from the first to third light source units 110, 130, and 150. The first to third light source units 110, 130, and 150 may be controlled.

That is, the light amount of the R component, the G component and the B component of the light emitted from the first to third light source units 110, 130, and 150 during the manufacturing process of the lighting apparatus according to the embodiment of the present invention is obtained by the measuring apparatus. .

The tristimulus values X, Y, and Z are calculated using the measured amounts of the R, G and B components. The corresponding color coordinates can be calculated through the tristimulus values X, Y, and Z. If the color coordinates calculated through the tristimulus values X, Y, and Z are close to or on the blackbody radiation curve, the calculated color coordinates can be the reference color coordinate. have. The reference color coordinates thus obtained are stored in the memory unit 500. In this case, the reference color coordinates are located in an area consisting of color coordinates of the light source units as described above.

Meanwhile, the controller 300 receives the R component signal, the G component signal, and the B component signal from the RGB sensing unit 200, generates a comparison color coordinate, and compares the reference color coordinate with the reference color coordinate read from the memory 500. Outputs a duty ratio control signal to reduce the error from the color coordinates. At this time, the control unit 300 calculates the corresponding tristimulus value through the R component signal, the G component signal, and the B component signal, and calculates the comparison color coordinate by using the tristimulus value.

Unlike the embodiment of the present invention, when the lighting device includes only the first light source unit 110 and the second light source unit 130, the lighting device is hard to emit light having a color temperature close to the black body emission curve. For example, when the first light source unit 110 emits light of 6500K and the second light source unit 130 emits light of 2700K, as shown in FIG. 3A, the first light source unit 110 and The color temperature and color coordinate change of light appearing as the light quantity of the second light source 130 changes is made along a straight line. Accordingly, the change in color temperature and color coordinate of the light is largely different from the change in color temperature and color coordinate of the blackbody radiation curve.

On the other hand, when the lighting apparatus includes the third light source unit 150 as well as the first light source unit 110 and the second light source unit 130 as in the embodiment of the present invention, light similar to the color temperature and color coordinate of the black body emission curve may be emitted. Can be. For example, the first light source unit 110 emits 6500 K of light, the second light source unit 130 emits 2700 K of light, and the third light source unit 150 of the greenish white light. In the case of emitting light, the lighting apparatus according to the embodiment of the present invention may emit light having a color temperature and color coordinates that change along a black body radiation curve by a change in the amount of light of the first light source unit 110 to the third light source unit 150.

In the above description, although a black body radiation curve is mentioned as a reference for the color temperature of the lighting device, an embodiment of the present invention is considered in consideration of another standard of the lighting device, the MacAdam curve or the Ansi bin curve. The reference color coordinate of the lighting device according to the can be set.

McAdam curve shown in Figure 4a is a graph showing the color distribution at the same color temperature. The color distribution at a specific color temperature increases as the outer ellipse moves from a specific color temperature. As shown in FIG. 4A, according to an exemplary embodiment of the present invention, when the lighting apparatus includes only the first light source unit 110 having a color temperature of 6500 K and the second light source unit 130 having a color temperature of 2700 K, the lighting apparatus emits light. The color distribution at the color temperatures of 5000 K, 4000 K, and 3500 K of the light is increased. Therefore, it can be seen that the characteristics of the lighting device are deteriorated.

On the other hand, when the reference color coordinates are set such that the color distribution is within Step 3 at each color temperature according to the embodiment of the present invention, as described above, the first to third light source units 110, 130, and 150 may be used. By controlling the amount of light change, it is possible to improve the characteristics of the lighting device. Accordingly, the color distribution at each color temperature of the light emitted from the light source units 110, 130, 150 of the lighting apparatus according to the embodiment of the present invention may be within Step 3.

As shown in FIG. 4B, in the embodiment of the present invention, when the lighting device includes only the first light source unit 110 having a color temperature of 6500 K and the second light source unit 130 having a color temperature of 2700 K, the light emitted by the lighting device is shown. The change in color temperature does not occur at the center of the Annecybin curve.

On the other hand, in the exemplary embodiment of the present invention, the reference color coordinate may be set so that the change in the color temperature of the light emitted by the lighting device is close to the center of the Annecy bin curve, and the amount of light of the first to third light source units 110, 130, and 150 corresponds to the reference color coordinate. By controlling the change, the characteristics of the lighting device can be improved.

Meanwhile, the lighting apparatus according to the embodiment of the present invention may include four or more light sources.

5 shows a lighting device according to another embodiment of the present invention. The lighting apparatus of FIG. 5 includes four light source units, but may include four or more light source units.

The plurality of third light source units 150a and 150b emit light different from the color temperature and the color coordinates of the first and second light source units 110 and 130. In addition, the plurality of third light source units 150a and 150b also emit light having different color temperatures and color coordinates. That is, the color coordinates and the color temperature of the light emitted from the third light source unit 150a are different from the color coordinates and the color temperature of the light emitted from the third light source unit 150b.

As a result, the light of the lighting device is inside the area (in the dotted rectangle) of the first optical excitation unit 110, the second optical excitation unit 130, and the plurality of third optical excitation units 150a and 150b. The amount of light of the light source units 110, 130, 150a and 150b may be controlled so that the color coordinates are positioned.

The reference coordinates are located in an area (inside a dotted rectangle) of the first light source unit 110 to the plurality of third light source units 150a and 150b, and the control unit 300 controls the reference coordinates and the color coordinates of light actually emitted. The amount of light from the first light source unit 110 to the fourth light source unit 170 is controlled so as to reduce an error between the first light source unit 110 and the fourth light source unit 170. Accordingly, as in the embodiment of the present invention, the area in which the lighting device can adjust the color coordinates may increase.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

The first light source unit 110 and the second light source unit 130
Third light source unit 150, 150a, 150b RGB sensing unit 200
Control unit 300 Power unit 400
Memory section 500

Claims (19)

A first light source unit and a second light source unit emitting light having different color temperatures and different color coordinates;
At least one third light source unit emitting light different from a color coordinate and a color temperature of the first light source unit and the second light source unit;
RGB for outputting an R component signal, a G component signal, and a B component signal corresponding to an amount of light of each of the R, G, and B components of light output from the first light source, the second light source, and the at least one third light source Sensing unit;
Wherein the color coordinates of the light output from the first light source, the second light source, and the at least one third light source are located in an area including color coordinates of each of the first light source, the second light source, and the at least one third light source. A control unit controlling an amount of light of the first light source unit, the second light source unit, and the at least one third light source unit; And
A power supply unit for supplying a voltage for changing the light amount of the first light source unit, the second light source unit and at least one third light source unit under the control of the controller.
Lighting device comprising a. The method of claim 1,
The RGB sensing unit includes an R filter, a G filter, and a B filter. The method of claim 1,
The plurality of third light source unit emits light having different color temperatures and color coordinates. The method of claim 1,
And the first light source unit and the second light source unit emit white light. The method of claim 1,
The power supply unit, characterized in that for supplying an alternating current voltage of the duty ratio under the control of the controller. The method of claim 5,
The first light source unit, the second light source unit and the at least one third light source unit include an LED,
The LED is a lighting device, characterized in that the amount of light changes according to the duty ratio of the AC voltage. A first light source unit and a second light source unit emitting light having different color temperatures and different color coordinates;
At least one third light source unit emitting light different from a color coordinate and a color temperature of the first light source unit and the second light source unit;
RGB for outputting an R component signal, a G component signal, and a B component signal corresponding to an amount of light of each of the R, G, and B components of light output from the first light source, the second light source, and the at least one third light source Sensing unit;
A memory unit for storing reference color coordinates positioned in an area consisting of color coordinates of each of the first light source unit, the second light source unit, and the one or more third light source units;
The R component signal, the G component signal, and the B component signal are input from the RGB sensing unit to generate a comparison color coordinate, and compare the reference color coordinate read from the memory unit to reduce an error value between the reference color coordinate and the comparison color coordinate. A controller configured to control an amount of light of a first light source unit, the second light source unit, and the at least one third light source unit; And
A power supply unit for supplying a voltage for changing the light amount of the first light source unit, the second light source unit and at least one third light source unit under the control of the controller.
Lighting device comprising a. The method of claim 7, wherein
And the reference color coordinates are set according to a blackbody radiation curve, a McAdam curve or an ancivin curve. The method of claim 7, wherein
The plurality of third light source unit emits light having different color temperatures and color coordinates. The method of claim 7, wherein
And the first light source unit and the second light source unit emit white light. The method of claim 7, wherein
The power supply unit, characterized in that for supplying an alternating current voltage of the duty ratio under the control of the controller. The method of claim 11,
The first light source unit, the second light source unit and the at least one third light source unit include an LED,
The LED is a lighting device, characterized in that the amount of light changes according to the duty ratio of the AC voltage. The method of claim 7, wherein
And the color distribution of each color temperature of the light emitted from the first light source, the second light source, and the at least one third light source is within 3 steps. A control method of a lighting apparatus including a first light source unit, a second light source unit, and at least one third light source unit emitting light having different color temperatures and different color coordinates,
Outputting an R component signal, a G component signal, and a B component signal corresponding to an amount of light of each of the R, G, and B components of light output from the first light source, the second light source, and the at least one third light source; ;
Generating a comparison color coordinate by receiving the R component signal, the G component signal, and the B component signal; And
Comparing the reference color coordinates and the reference color coordinates positioned in the area consisting of the color coordinates of each of the first light source, the second light source and the at least one third light source and the comparison color coordinates to reduce the error value of the reference color coordinates and the comparison color coordinates. Controlling an amount of light of the first light source unit, the second light source unit, and the at least one third light source unit;
Control method of the lighting device comprising a. The method of claim 14,
And said reference color coordinates are set according to a blackbody radiation curve, a McAdam curve or an ancivin curve. The method of claim 14,
And a plurality of third light sources emit light having different color temperatures and color coordinates. The method of claim 14,
And the first light source unit and the second light source unit emit white light. The method of claim 14,
The control of the amount of light is a control method of the lighting apparatus, characterized in that by the supply of the alternating current voltage of the duty ratio. The method of claim 14,
And the color distribution of each color temperature of light emitted from the first light source, the second light source, and the at least one third light source is within 3 steps.

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