KR100949194B1 - Light emitting diode light - Google Patents

Abstract

The present invention relates to a LED lighting device that can improve the efficiency and color rendering by implementing a color by combining a plurality of LEDs using a single color LED in combination with a white LED. The present invention, a light guide plate for guiding light; A light source unit configured to supply the light to the side of the light guide plate; And a case for accommodating and fixing at least a portion of the light source unit and the light guide plate therein, wherein the light source unit is a white LED in which a fluorescent material of a second color is applied to an LED emitting light of a first color, and a third color. It provides an LED lighting device comprising a third LED to emit light.

Description

LED lighting device {Light emitting diode light}

The present invention relates to an LED lighting apparatus, and more particularly, to an LED lighting apparatus expressing white or daylight color using two or more kinds of LEDs (Light Emitting Diodes) representing different colors.

LED (Light Emitting Diode) lighting device has a number of advantages over the conventional lighting device, it is widely used as a back light (liquid crystal dislay) (LCD), a mobile phone, a portable digital device, or an independent lighting device.

LED lighting devices consume much less power than conventional lighting equipment. One tenth of incandescent bulbs and one half of fluorescent lamps emit the same brightness. In addition, LED (Light Emitting Diode) lighting device has a long life LED. Incandescent lamps use only 1000 to 4000 hours, while LEDs can use 50,000 to 100,000 hours. Its low cost of replacement and maintenance makes it suitable for high replacement costs such as building exterior walls and swimming pool large street lights.

On the other hand, in a conventional LED lighting device, white can be realized by a white LED using a yellow phosphor on a blue chip. In this case, however, when analyzing the spectrum of a white LED, the blue spectrum and the yellow spectrum dominate. Therefore, the color rendering index is low overall, and there is a lot of difference from the white color we encounter in everyday life.

An object of the present invention is to provide a LED lighting device that can improve the efficiency and color rendering by implementing a color by combining a plurality of LEDs using a single color LED in combination with a white LED.

The present invention, a light guide plate for guiding light; A light source unit configured to supply the light to the side of the light guide plate; And a case for accommodating and fixing at least a portion of the light source unit and the light guide plate therein, wherein the light source unit is a white LED in which a fluorescent material of a second color is applied to an LED emitting light of a first color, and a third color. It provides an LED lighting device comprising a third LED to emit light.

The light source unit may further include a fourth LED emitting light in a fourth color.

A diffuser plate disposed in a direction in which the light of the light guide plate is outputted to diffuse the light; A diffusion sheet disposed between the diffusion plate and the light guide plate to diffuse the light; A reflection sheet disposed in a direction opposite to a direction in which the light of the light guide plate is output, reflecting the light; And a lower case coupled to the case in a direction opposite to the direction in which the light of the reflective sheet is output.

Another aspect of the present invention is to supply light, at least one light source unit disposed on a surface facing the direction in which the light is output on the printed circuit board; A diffuser plate configured to be spaced apart from each other in a direction in which the light is output with respect to the printed circuit board; And a case configured to receive and fix at least a portion of the light source unit and the diffusion plate therein, wherein the light source unit is coated with a fluorescent material of a second color to the LED emitting light of the first color, and a third LED. Provided is an LED lighting device including a third LED emitting color.

The light source unit may further include a fourth LED emitting light in a fourth color.

A diffusion sheet disposed on one surface of the diffusion plate to diffuse the light; A transparent plate configured to be spaced apart from each other in a direction in which the light is output with respect to the printed circuit board; A reflection sheet disposed on a surface of the printed circuit board in a direction in which the light is output and reflecting the light; And a lower case coupled to the case in a direction opposite to the direction in which the light of the printed circuit board is output.

According to the LED lighting apparatus according to the present invention, by using a single color LED in combination with a white LED to implement a color by combining the LED of several colors, efficiency and color rendering can be improved.

Hereinafter, with reference to the accompanying drawings will be described in more detail the LED lighting apparatus according to a preferred embodiment of the present invention.

1 shows an edge type LED lighting device 100 according to a preferred embodiment of the present invention. 2 illustrates a light source unit 120 in which the LEDs 121, 122, and 123 are disposed in the edge type LED lighting apparatus 100 of FIG. 1. 3 shows the white LED 121 shown in FIG. 2.

Referring to the drawings, the LED lighting apparatus 100 is a white LED (2), preferably a fluorescent material of a second color, preferably yellow, is applied to the LED that emits light of the light source unit 120 for supplying light in a first color, preferably blue ( 121) includes monochromatic LEDs 122 and 123 which emit light of a third color, preferably green and / or a fourth color, preferably red, respectively, thereby improving color rendering properties while using an efficient white LED 121. You can. That is, the output of the white LED 121 having excellent efficiency compensates for the lack of color rendering as shown in FIG. 4, thereby improving both efficiency and color rendering.

In the LED lighting apparatus 100 shown in FIG. 1, the light source unit 120 is attached to the side surface of the light guide plate 110, and the light source unit is connected to the edge type LED lighting apparatus 100 to which light is supplied from the side of the light output direction. A blue LED is coated with a yellow fluorescent material, and an embodiment of an illumination including a four-color LED light source formed by combining blue and yellow, ie, blue and yellow, and green and red.

To this end, the LED lighting device 100 is a light guide plate 110; A light source unit 120; Case 130; Diffusion sheet 140; Diffuser plate 150; Reflective sheet 160; Lower case 170; A printed circuit board 180; And a power supply device 190.

The light guide plate 110 guides the light generated by the light source unit 120. The light source unit 120 supplies light and is disposed at a side surface of the light guide plate 110. That is, the present embodiment is an edge type LED lighting device 100, the light source unit 120 is disposed on the side of the light guide plate 110.

Therefore, the light incident through the side surface of the light guide plate 110 passes through the light guide plate 110, and the light is uniformly distributed in all areas in which the light is output. The light source unit 120 includes a plurality of LED light sources.

The light guide panel 110 receives light emitted from the light source unit 120 using a transparent polycarbonate or an acrylic panel, and light the entire area of the screen through a pattern having a predetermined shape and area deposited on the acrylic surface. It distributes evenly.

The case 130 accommodates and fixes the components constituting the LED lighting device 100 including the light source unit 120 and the light guide plate 110 therein together with the lower case 170. The case 130 may be an aluminum (Al) profile for easy heat transfer.

The case 130 has a center portion empty so that light can be output from the center portion, and the light guide plate 110 in a side of the light output direction together with the lower case 170 of the lower portion from the side portion; A light source unit 120; And storing and fixing the printed circuit board 180, storing the diffusion sheet 140 and the diffusion plate 150 in the upper portion of the light guide plate 110 and the reflecting sheet 160 in the lower portion thereof in the direction in which light is output. Can be fixed

The diffusion sheet 140 is disposed in a direction in which the light of the light guide plate 110 is output to diffuse the light. The diffusion plate 150 is disposed in a direction in which the light of the light guide plate 110 is output to diffuse the light. In this embodiment, the diffusion sheet 140 is disposed between the diffusion plate 150 and the light guide plate 110.

The diffuser sheet 140 is positioned on the upper surface of the light guide plate 110 to scatter light exiting from the surface of the light guide plate 110 in a predetermined direction so as to spread evenly over the surface of the light guide plate 110.

The reflective sheet 160 is disposed in a direction opposite to the direction in which the light of the light guide plate 110 is output, and reflects light in a direction opposite to the direction in which the light is output, so that the reflective sheet 160 may go in the direction in which the light is output.

The light source unit 120 including the LED is disposed on the printed circuit board 180. That is, the printed circuit board 180 extends along the side surface of the light guide plate 110, and a plurality of LEDs 121, 122, and 123 are formed on the side of the light guide plate 110 toward the light guide plate of the printed circuit board 180. Can be disposed along. The power supply device 190 is connected to the printed circuit board 180 to supply power to control components and elements disposed on the printed circuit board 180 for controlling the light source unit 120 and the LED light source 120.

As shown in FIG. 3, the light source unit 120 includes a white LED 121 formed by coating a fluorescent material 121b of a second color, for example, yellow, on a LED 121a that emits a first color, for example, of blue. May be included. The white LED 121 having such a configuration is superior in efficiency to the conventional monochromatic LEDs 122 and 123.

The light source unit 120 may include a white LED 121 and a red LED 123 emitting a third color, for example, red, thereby improving color rendering. In addition, various colors may be expressed by adjusting the gray levels of the white LED 121 and the red LED 123.

In this case, the light source unit 120 is not limited thereto, and may further include two or more LEDs that emit light of different colors in the white LED 121.

In another embodiment, the light source unit 120 may include a white LED 121, a green LED 122 emitting green light, and a red LED 123 emitting red light. In this case, the color rendering can be improved as shown in FIG. 6. In addition, the brightness of each of the white LED 121, the green LED 122, and the red LED 123 may be controlled to express a desired gray scale.

As another embodiment, the light source unit 120 may include a white LED 121, a green LED 122 emitting green light, a red LED 123 emitting red light, and a blue LED 124 emitting blue light. Can be. In this case, color rendering can be improved. In addition, the brightness of each of the white LED 121, the green LED 122, the red LED 123, and the blue LED 124 may be controlled to more accurately and easily express a desired gray scale.

FIG. 6 schematically shows a spectrum of light output from the LED lighting apparatus 100 according to an embodiment of the present invention. The white LED 121 has a spectrum having a large relative intensity in a blue region and a yellow region. However, it can be seen that other regions are empty and the color rendering is inferior to the spectrum d of natural light.

However, since the LED lighting device 100 according to the present invention further includes a green LED 122 and / or a red LED 123 and / or a blue LED 124, the green region is dominated by the spectrum (c). The spectrum (a) of the white LED 121 can be supplemented by the spectrum (b) where the red region is dominant. Accordingly, color rendering can be improved.

In addition, by controlling the white LED 121 expressing white and the blue LED 124 expressing blue, green and red, green LED 122 and red LED 123 respectively by the colors of the blue and yellow regions. In addition, tens of millions of different colors can be added in white. In addition, by individually controlling the white LED 121, the blue 124, the green LED 122, and the red LED 123, the color temperature and / or the color rendering property can be varied.

In addition, the white LED 121 may have high efficiency, and may reduce power consumption and heat generation.

Meanwhile, the blue LED 124, the green LED 122, and the red LED 123 are less expensive than the white LED 121. Therefore, it is possible to provide the LED lighting device 100 which can improve color rendering at low cost and have good efficiency, and add tens of millions of colors to various color temperature control and white.

4 shows a direct type LED lighting device 200 according to one preferred embodiment of the present invention. FIG. 5 illustrates a light source unit including the LEDs 221, 222, and 223 disposed on the printed circuit board 280 in the direct type LED lighting device 200 of FIG. 4.

Referring to the drawings, the LED lighting device 200 is a white LED (2), preferably a yellow fluorescent material is applied to the LED that the light source 220 for supplying light emits light of the first color, preferably blue ( High efficiency white LED 221 including blue LEDs 224, monochromatic LEDs 222, 223, each emitting a third color, preferably green, and / or a fourth color, preferably red, respectively. You can use it to improve color rendering. That is, the output of the white LED 221 having excellent efficiency compensates for the lack of color rendering as shown in FIG. 6, thereby improving both efficiency and color rendering and implementing various color and color temperature controls.

In the LED lighting apparatus 200 illustrated in FIG. 4, the light source unit 220 is attached directly under the light output direction, so that the light source unit 220 is a white LED in the direct type LED lighting apparatus 200 to supply the light. 221 and monochromatic LEDs 222, 223. Like reference numerals are used to refer to the same elements as in the embodiment illustrated in FIG. 1, and detailed description thereof will be omitted.

LED lighting device 200 is a transparent plate 210; A light source unit 220; Case 230; Diffusion sheet 240; Diffuser plate 250; Reflective sheet 260; Lower case 270; A printed circuit board 280; And a power supply (not shown). In this case, the light source unit 220 may include a white LED 221, a green LED 222, a red LED 223, and a blue LED 224.

The light source unit 220 supplies light, and may be disposed on a surface of the printed circuit board 280 facing the light output direction. In addition, the white LED 221, the green LED 222, the red LED 223, and the blue LED 224 included in the light source unit 220 may each include at least one or more preferably on the printed circuit board 280. Can be deployed.

The case 230 accommodates and fixes the components constituting the LED lighting device 200 including the light source unit 220 and the transparent plate 210 therein together with the lower case 270 therein. The case 230 may be empty at the center to output light from the center, and may fix the transparent plate 210, the printed circuit board 280, the diffusion sheet 240, and the diffusion plate 250 at the side. . The light source unit 220 may be mounted on one side or both sides of the printed circuit board 280 in the direction in which the light is output, and the reflective sheet 260 may be attached.

The diffusion plate 250 is spaced apart from the printed circuit board 280 in the direction in which light is output to diffuse the light. The diffusion sheet 240 is disposed on one surface of the diffusion plate to diffuse the light.

The reflective sheet 260 is disposed on the surface of the printed circuit board 280 in the direction in which the light is output to reflect the light. The transparent plate 210 is spaced apart from the printed circuit board 280 in the direction in which light is output and transmits light.

In the present exemplary embodiment, the light source unit 220 and the reflective sheet 260 are disposed on the surface of the printed circuit board 280 in the direction in which the light is output, and the transparent plate 210 is spaced apart from the printed circuit board 280 by a predetermined interval. The diffusion sheet 240 and the diffusion plate 250 may be sequentially disposed thereon.

As illustrated in FIG. 3, the light source unit 220 may include a white LED 221 formed by applying a fluorescent material of a second color, for example, yellow, to an LED emitting light of a first color, for example, blue. The white LED 221 having such a configuration is superior in efficiency to the conventional monochromatic LEDs 222, 223, and 224. The light source unit 220 may include a white LED 221, a red LED 223 emitting a third color, for example, green, and a blue LED 224 emitting blue. In addition, various colors may be expressed by adjusting gray levels of the white LED 221, the red LED 223, the green LED 222, and the blue LED 224.

In this case, the light source unit 220 is not limited thereto, and may further include two or more LEDs that emit light of different colors in the white LEDs 221.

In another embodiment, the light source unit 220 may include a white LED 221, a blue LED 224, a green LED 222, and a red LED 223 emitting red light. In this case, the color rendering can be improved as shown in FIG. In addition, the brightness of each of the white LED 221, the blue LED 224, the green LED 222, and the red LED 223 may be controlled to more accurately and easily express a desired gray scale.

FIG. 6 schematically shows a spectrum of light output from an LED lighting apparatus according to an embodiment of the present invention. The white LED 221 has a spectrum having a large relative intensity in a blue region and a yellow region. However, it can be seen that other regions are empty and the color rendering is inferior to the spectrum d of natural light.

However, the LED lighting apparatus 200 according to the present invention further includes a green LED 222 and / or a red LED 223, and / or a blue LED 224, so that the green region is dominated by the spectrum (c). The spectrum (a) of the white LED 221 may be supplemented by the spectrum (b) where the red region is dominant. Therefore, color rendering can be improved.

In addition, white LEDs 221 expressing white and blue LEDs 224 expressing blue, green, and red, green LEDs 222, and red LEDs 223 are respectively controlled by colors of the blue and yellow regions. Thus, tens of millions of different colors can be added to white. In addition, by individually controlling the white LED 221, the blue 224, the green LED 222, and the red LED 223, the color temperature and / or the color rendering property can be varied.

In addition, the white LED 221 has high efficiency, thereby reducing power consumption and heat generation.

Meanwhile, the blue LED 224, the green LED 222, and the red LED 223 are less expensive than the white LED 221. Therefore, it is possible to provide the LED lighting apparatus 200 that can improve color rendering at low cost and have good efficiency, and add tens of millions of colors to various color temperature control and white.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, it is merely an example, and those skilled in the art may realize various modifications and equivalent other embodiments therefrom. I can understand. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

1 is a view schematically showing an example of an edge lighted type LED (Light Emitting Diode) lighting apparatus as a preferred embodiment according to the present invention.

FIG. 2 is a view schematically illustrating a light source unit in which LEDs (light emitting diodes) are disposed in the edge type LED lighting apparatus of FIG. 1.

3 is a view schematically showing the white LED shown in FIG.

4 is a view schematically showing an example of a direct lighted type LED (Light Emitting Diode) lighting apparatus as another preferred embodiment according to the present invention.

FIG. 5 is a view schematically illustrating a light source unit in which LEDs (Light emtting diodes) are disposed in the direct type LED lighting apparatus of FIG. 4.

6 is a graph schematically showing the spectrum of light output from the LED lighting apparatus according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100, 200: LED lighting device, 110: LGP

210: transparent plate, 120, 220: light source unit,

130, 230: case, 140, 240: diffusion sheet,

150, 250: diffuser plate, 160, 260: reflective sheet.

Claims (14)

A light guide plate for guiding light; A light source unit configured to supply the light to the side of the light guide plate; And A case configured to house and fix at least a portion of the light source unit and the light guide plate therein; The light source unit includes a white LED in which a fluorescent material of a second color is applied to the LED emitting light of a first color, and a third LED emitting light of a third color, The light source further includes a fourth LED emitting light in a fourth color, The third LED and the fourth LED LED lighting device is a monochromatic LED that emits in different colors. delete The method of claim 1, An LED lighting device wherein the first color is blue, the second color is yellow, the third color is green, and the fourth color is red. The method of claim 3, LED lighting device further comprises a blue LED that the light source emits blue. The method of claim 1, And at least one LED in which the light source unit emits light in a color different from the first color, the second color, the third color, and the fourth color. The method of claim 1, A diffuser plate disposed in a direction in which the light of the light guide plate is outputted to diffuse the light; A diffusion sheet disposed between the diffusion plate and the light guide plate to diffuse the light; And And a reflection sheet disposed in a direction opposite to a direction in which the light of the light guide plate is output and reflecting the light. The method of claim 6, And a lower case coupled to the case in a direction opposite to the direction in which the light of the reflective sheet is output. A light source unit for supplying light, the light source including at least one LED disposed on a surface of the printed circuit board facing the light output direction; A diffuser plate configured to be spaced apart from each other in a direction in which the light is output with respect to the printed circuit board; And A case for accommodating and fixing at least a portion of the light source unit and the diffusion plate therein; The light source unit includes a white LED in which a fluorescent material of a second color is applied to the LED emitting light of a first color, and a third LED emitting light of a third color, The light source further includes a fourth LED emitting light in a fourth color, The third LED and the fourth LED LED lighting device is a monochromatic LED that emits in different colors. delete The method of claim 8, An LED lighting device wherein the first color is blue, the second color is yellow, the third color is green, and the fourth color is red. The method of claim 10, LED lighting device further comprises a blue LED that the light source emits blue. The method of claim 8, And at least one LED in which the light source unit emits light in a color different from the first color, the second color, the third color, and the fourth color. The method of claim 8, A diffusion sheet disposed on one surface of the diffusion plate to diffuse the light; A transparent plate configured to be spaced apart from each other in a direction in which the light is output with respect to the printed circuit board; And And a reflective sheet disposed on a surface of the printed circuit board in a direction in which the light is output and reflecting the light. The method of claim 13, And a lower case coupled to the case in a direction opposite to the direction in which the light of the printed circuit board is output.

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