KR20110113702A - Light source device - Google Patents

Abstract

The embodiment may include a first light guide plate, a second light guide plate stacked on the first light guide plate, a reflector disposed below the second light guide plate, a first light source unit optically coupled to each side of the first light guide plate and the second light guide plate; A first light excitation film and a second light excitation film disposed between the second light source portion and between the first light guide plate and the first light source portion, and between the second light guide plate and the second light source portion, wherein the first light excitation film includes: A first fluorescent material, and a second fluorescent material different from the first fluorescent material, wherein the second photoexcitation film includes the first fluorescent material and the second fluorescent material, and the first photoexcitation film and the The first fluorescent material and the second fluorescent material each contained in the second optical excitation film is partitioned and randomly arranged to provide a light source device.

Description

Light source device

The present invention relates to a light source device.

In general, a lot of bulbs or fluorescent lights are used as indoor or outdoor lighting, such a bulb or fluorescent lamp has a short life and has to be replaced frequently. In addition, the conventional fluorescent lamp has a problem that excessively decreases the illuminance due to deterioration over the use time.

In order to solve this problem, luminaires using LEDs that can realize excellent controllability, fast response speed, high electro-optical conversion efficiency, long life, low power consumption, high brightness, and sensitive lighting have been developed.

Light emitting device (LED) lighting is a next-generation lighting, which is a harmonic to human body because it uses long-wavelength light rather than ultraviolet light.

Therefore, many lighting fixtures have been developed to which LEDs are applied. There are difficulties in implementing the characteristics of light, for example, the color rendering index and various colors, which are the sources of illumination.

The present invention provides a light source device that can have a color rendering index close to sunlight.

The present invention provides a light source device that can implement various colors.

According to an aspect of the present invention, a first light guide plate, a second light guide plate stacked on the first light guide plate, a reflective plate disposed below the second light guide plate, optically coupled to each side of the first light guide plate and the second light guide plate A first light excitation film and a second light excitation film disposed between each of the first light source portion and the second light source portion, and between the first light guide plate and the first light source portion, and between the second light guide plate and the second light source portion. The optical excitation film includes a first fluorescent material and a second fluorescent material different from the first fluorescent material, and the second optical excitation film includes the first fluorescent material and the second fluorescent material, and the first fluorescent material includes: The first fluorescent material and the second fluorescent material contained in the optical excitation film and the second optical excitation film, respectively, are partitioned and randomly arranged to provide a light source device.

According to another aspect of the present invention, a first light guide plate, a second light guide plate stacked on the first light guide plate, a reflector disposed below the second light guide plate, and a first optically coupled side portion of each of the first light guide plate and the second light guide plate A first light excitation film and a second light emitting element and a second plurality of light emitting elements, and between the first light guide plate and the first plurality of light emitting elements and between the second light guide plate and the second plurality of light emitting elements An optical excitation film, wherein the first plurality of light emitting devices are warm white LEDs that emit a correlated color temperature ranging from 2000K to 3000K arranged in a row, and the second plurality of light emitting devices are in line It provides a light source device characterized in that the cool white light emitting device (Cool white LED) that emits a correlated color temperature ranging from 5500K to 6500K.

Another aspect of the invention is optically coupled to a first light guide plate, a second light guide plate stacked on the first light guide plate, a reflector disposed below the second light guide plate, and sides of each of the first light guide plate and the second light guide plate. A first light excitation film and a first light emitting element and a second plurality of light emitting elements, and a first light excitation film and a second light emitting plate disposed between the first light guide plate and the first plurality of light emitting elements and between the second light guide plate and the second plurality of light emitting elements 2. The light emitting device of claim 1, wherein the first plurality of light emitting devices include a warm white LED emitting a correlated color temperature in a range of 2000K to 3000K, and a cool white emitting a correlated color temperature in a range of 5500K to 6500K. The light emitting device includes a cool white LED, and the second plurality of light emitting devices includes the warm white LED and the cool white LED, and the warm white light emitting device War m white LED) and the cool white LED provide a light source device which is arranged randomly.

The light source device according to the present invention can implement high color rendering to prevent the color of an object from being distorted.

The light source device can produce emotional lighting by mixing various colors.

1 is a perspective view showing a light source device according to an embodiment of the present invention.
2 is a diagram illustrating a pattern arrangement of a light guide plate according to an exemplary embodiment of the present invention.
3 is a view showing a light source unit of the light source device according to the embodiment of the present invention.
4A to 4C are diagrams illustrating an arrangement structure of a warm white LED and a cool white LED included in each of a first light source unit and a second light source unit according to an embodiment of the present invention. to be.
5 is a view showing the structure of a photoexcitation film according to an embodiment of the present invention.
6 is a view showing an arrangement structure of the fluorescent material included in the optical excitation film and the arrangement structure of the light excitation film and the light source unit in an embodiment according to the present invention.

1 is a perspective view showing a light source device according to an embodiment of the present invention, Figure 2 is a view showing a pattern arrangement of the light guide plate according to an embodiment of the present invention, Figure 3 is a light source unit of the light source device according to an embodiment of the present invention The figure shown.

First, referring to FIG. 1, the light source device 100 according to the first embodiment includes a first light guide plate 110, a second light guide plate 120, a reflector plate 130, a first light source unit 150, and a second light source unit ( 160, a first light excitation film 170, and a second light excitation film 180.

The first light guide plate and the second light guide plate 110 and 120 convert the point light source into a surface light source, and the first pattern 111 and the second pattern 121 are formed on one surface so that light incident therein can be emitted to the outside. Is formed.

The first LGP 110 is stacked on the second LGP 120 and formed on the first LGP 110 and the second LGP 120. The first and second patterns 111 and 121 serve to diffuse or scatter light to be emitted to the outside.

As shown in FIG. 2, the positions of the first pattern 111 and the second pattern 121 may overlap or overlap each other, but preferably, the first pattern 111 and the second pattern 121 do not overlap. The first light guide plate 110 and the second light guide plate 120 are formed on one surface thereof, respectively.

The arrangement of the first pattern and the second pattern may improve the diffusion or scattering characteristics of the incident light. Therefore, it is possible to improve the light efficiency by reducing the light path.

That is, when the light is incident on one surface through the inside of the second LGP 120 at the total reflection angle, the incident light is totally reflected on the other surface of the second LGP 120 to increase the light path. However, when the first pattern is formed on one surface of the first LGP 110 stacked on the second LGP 120, the light to be totally reflected from the other surface of the second LGP 120 is on one surface of the first LGP 110. Diffusion and scattering occur in the formed first pattern 111 and immediately exit to the outside without total reflection. Therefore, the optical path is effectively reduced.

The first LGP 110 and the second LGP 120 may be made of a transparent resin, and the manufacturing method may be printed by a silk screen printing method.

The diffusion film 190 may be disposed above the first LGP 110. The diffusion film 190 serves to evenly emit light incident into the first LGP 110 and the second LGP 120 to the outside.

The reflective plate 130 is disposed under the second light guide plate 110, and prevents light incident into the first light guide plate 110 or the second light guide plate 120 from being emitted backward.

The first light source unit 150 is disposed on the side of the first light guide plate 110, and the second light source unit 160 is disposed on the side of the second light guide plate 120. The first light source unit 150 and the second light source unit 160 may be any device capable of emitting light, and an embodiment of the present invention uses a light emitting diode that is a light emitting device.

The first light source unit 150 and the second light source unit 160 are optically coupled to the first light guide unit 110 and the second light guide unit 120, respectively, so that the light generated from the first light source unit 150 is the first light guide. The light is incident into the unit 110 and the light generated by the second light source unit 160 is incident into the second light guide unit 120.

As illustrated in FIG. 3, the first light source unit 150 and the second light source unit 160 may include a plurality of light emitting devices 152 disposed on the printed circuit boards 151 and 161 and the printed circuit boards 151 and 161. 162, and each of the plurality of light emitting elements 152 and 162 is arranged in a line in the length direction of the printed circuit board. The plurality of light emitting elements 152 and 162 may be blue light emitting devices, but a white light emitting device having a high color rendering index (CRI) is used if possible. The white light emitting device is a light emitting device that realizes white by molding a synthetic resin including a yellow phosphor on the blue light emitting chip.

As described above, there are various types of light emitting devices capable of realizing a white color, and a plurality of light emitting devices used in the embodiment of the present invention may specifically include a plurality of light emitting devices 152 included in the first light source unit 150. Each of the printed circuit boards 151 and 161 includes a warm white LED and a plurality of light emitting devices 162 included in the second light source unit 160. Arranged on the phase.

4A to 4C are diagrams illustrating an arrangement structure of a warm white LED and a cool white LED included in each of a first light source unit and a second light source unit according to an embodiment of the present invention. to be.

As shown in FIG. 4A, Warm white LEDs are arranged in a line on the printed circuit board 151 of the first light source unit 150, and Cool white LEDs are arranged in a second line. It may be arranged in a line on the printed circuit board 161 of the light source unit 160.

In addition, as illustrated in FIG. 4B, the warm white LED 2 and the cool white LED may be in the printed circuit board length direction on the printed circuit board 151 of the first light source unit 150. Alternately, they may be alternately arranged in a row, and may also be alternately arranged on the printed circuit board 161 of the second light source unit 160 in the printed circuit board length direction. In this case, the arrangement between the warm white LED 2 and the cool white LED of the first light source 150 and the second light source 160 has a lattice pattern.

In addition, as illustrated in FIG. 4C, a warm white LED 2 and a cool white LED may be randomly arranged over the entire first light source 150 and the second light source 160. Can be.

On the other hand, a warm white light emitting device is a light emitting device that emits a correlated color temperature within a range of 2000K to 3000K, and shows a warm color, and a cool white light emitting device is a light emitting device that emits a correlated color temperature within a range of 5500K to 6500K, and displays a cool color. I broke it.

The warm white light emitting device and the cool white light emitting device are devices that emit white light by themselves without a combination of red, green, and blue light emitting devices. That is, in the warm white light emitting device and the cool white light emitting device, a synthetic resin including a phosphor that emits light by converting the light into a correlated color temperature corresponding to an upper portion of the blue chip is molded to realize a correlated color temperature of white.

As such, the warm white light emitting device and the cool white light emitting device may emit a correlated color temperature at each light source unit 150 and 160 to emit white light of mixed light, and thus, a color rendering index indicating closeness to natural sunlight (Color Rendering Index: CRI) increases. Therefore, the color of the real object can be prevented from being distorted, and the eye fatigue of the user is reduced.

The first light excitation film 170 is disposed between the first light guide portion 110 and the first light source portion 150, and the second light excitation film 180 is the second light guide portion 120 and the second light source portion 160. ) Is placed between. The first photoexcitation film 170 and the second photoexcitation film 170 include various fluorescent materials therein.

The first light excitation film 170 and the second light excitation film 180 convert a portion of wavelengths of the light emitted from the first light source unit 150 and the second light source unit 160 to convert the color of the light.

5 is a view showing the structure of a photoexcitation film according to an embodiment of the present invention.

As shown in FIG. 5, the photoexcitation films 170 and 180 contain a fluorescent material 172 inside the transparent resin 171, and a transparent protective film 173 is stacked on the outside of the transparent resin. Silicone resin is mainly used for transparent resin, In addition, if it is a material which has transparency, all can be used.

Although not shown in the drawings, a curing agent or an additive may be included in the transparent resin, the curing agent cures the transparent resin, and the additive evenly disperses the fluorescent material in the transparent resin. In addition, a diffusion material may be included in the transparent resin, and the diffusion material improves the refractive index of the light source to increase the excitation rate of the fluorescent material.

The protective film 173 disposed outside the transparent resin is for securing moisture resistance and heat resistance of the fluorescent material. The protective film 173 uses a colorless transparent synthetic resin having excellent light transmittance, but is not particularly limited. For example, polyethylene terephthalate (PET), polyethylene naphthalate, acrylic resin, polycarbonate, polystyrene, and the like.

6 illustrates an arrangement structure of the fluorescent material included in the optical excitation film and an arrangement structure of the optical excitation film and the light source unit in an embodiment according to the present invention.

As shown, the first optical excitation film 170 includes a first fluorescent material 172a and a second fluorescent material 1720b different from the first fluorescent material 172a. The second fluorescent material 172b is partitioned from each other in the optical excitation film and arranged alternately in the longitudinal direction of the optical excitation film 170.

In addition, the second photoexcitation film 180 includes a first fluorescent material 182a and a second fluorescent material 1820b different from the first fluorescent material 182a, and the first fluorescent material 182a and the second fluorescent light The materials 182b are partitioned from each other in the second photoexcitation film 180 and are alternately arranged in the longitudinal direction of the second photoexcitation film 180. In this case, an arrangement structure of the first fluorescent materials 172a and 182a and the second fluorescent materials 172b and 182b included in the first and second photoexcitation films 170 and 180 has a lattice pattern. .

Although not shown in the drawings, the first fluorescent materials 172a and 182a and the second fluorescent materials 172b and 182b included in the first photoexcitation film 170 and the second photoexcitation film 180 may be formed of light. When it is desired to emit light of a specific color at a specific position of the color or the emission surface, it may be arranged locally or randomly in the longitudinal direction of the optical excitation films 170 and 180.

However, when the first fluorescent materials 172a and 182a and the second fluorescent materials 172b and 182b are alternately arranged, when the light is emitted to the outside by the surface light source through the light guide plate, the colors are more evenly mixed. Various colors can be produced on the light exit surface.

Of course, the implementation of the color may depend on the color of the light emitted from the light emitting element itself, but preferably depends on the material of the fluorescent material included in the optical excitation film.

When the first fluorescent materials 172a and 182a and the second fluorescent materials 172b and 182b are alternately arranged, as illustrated, the plurality of light emitting devices 152 and 162 of the light source units 150 and 160 may be optically excited. The first fluorescent materials 172a and 182a and the second fluorescent materials 172b and 182b disposed in the films 170 and 180 are matched to each other. Therefore, the alignment characteristics between the plurality of light emitting elements and the fluorescent material may be good, and thus light having a color temperature to be implemented may be emitted.

When the plurality of light emitting devices are light emitting devices that realize the same color temperature and color, the alignment characteristics between the light emitting device and the fluorescent material do not affect the color characteristics to be implemented, but the plurality of light emitting devices are, for example, a cool white light emitting device and a light emitting device. When the cool white light emitting device and the warm white light emitting device are alternately arranged, when the alignment between the fluorescent material and the cool and warm white light emitting devices is not good, the light of the adjacent cool or warm white light emitting device is formed. Since this fluorescent substance can pass through, a problem arises in that light having an unwanted color temperature is emitted.

Each of the first fluorescent materials 172a and 182a and the second fluorescent materials 172b and 182b absorbs light emitted from the light source units 150 and 160 and converts the light into different wavelength bands. Accordingly, the first fluorescent materials 172a and 182a and the second fluorescent materials 172b and 182b may be adjusted according to the desired color of the light emitted to the outside.

In this way, the fluorescent material included in the optical excitation film can convert the color of the emitted light, so that light of various colors can be produced.

In addition, the above description has been made with reference to the embodiments, which are merely examples and are not intended to limit the present invention, and those skilled in the art to which the present invention pertains do not depart from the essential characteristics of the present embodiments. It will be appreciated that various modifications and applications are possible. The scope of the present invention is shown by the following 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 in the scope of the present invention. do.

110: first light guide plate
120: second light guide plate
130: reflector
150: first light source
160: second light source
170: first light excitation film
180: second light excitation film

Claims (16)

A first light guide plate;
A second light guide plate stacked on the first light guide plate;
A reflection plate disposed under the second light guide plate;
A first light source unit and a second light source unit optically coupled to sides of each of the first light guide plate and the second light guide plate; And
A first light excitation film and a second light excitation film disposed between the first light guide plate and the first light source portion and between the second light guide plate and the second light source portion, respectively,
The first photoexcitation film includes a first fluorescent material and a second fluorescent material different from the first fluorescent material,
The second photoexcitation film includes the first fluorescent material and the second fluorescent material,
And the first fluorescent material and the second fluorescent material respectively included in the first optical excitation film and the second optical excitation film are partitioned and arranged at random. The method of claim 1,
And the first fluorescent material and the second fluorescent material arranged in the first optical excitation film and the second optical excitation film are arranged in a lattice pattern. The method of claim 1,
Each of the first and second LGPs has a reflection pattern formed therein to diffuse or scatter light. The method of claim 1,
And the first and second light source units are a plurality of white light emitting elements arranged in a row. The method of claim 1,
Each of the first and second light source units includes a plurality of light emitting devices arranged in a row.
The plurality of light emitting devices of the first light source unit may be warm white LEDs.
The light emitting device of claim 2, wherein the plurality of light emitting devices of the second light source unit are cool white LEDs. A first light guide plate;
A second light guide plate stacked on the first light guide plate;
A reflection plate disposed under the second light guide plate;
A first plurality of light emitting elements and a second plurality of light emitting elements optically coupled to sides of each of the first light guide plate and the second light guide plate; And
A first optical excitation film and a second optical excitation film disposed between each of the first light guide plate and the first plurality of light emitting elements and between the second light guide plate and the second plurality of light emitting elements,
The first plurality of light emitting devices are warm white LEDs that emit a correlation color temperature ranging from 2000K to 3000K in a row.
And the second plurality of light emitting devices are cool white LEDs emitting a correlated color temperature ranging from 5500K to 6500K arranged in a row. The method of claim 6,
And a first fluorescent material in the first light excitation film, and a second fluorescent material different from the first fluorescent material in the second light excitation film. The method of claim 6,
And the first fluorescent material and the second fluorescent material are partitioned and randomly arranged in the first optical excitation film and the second optical excitation film. The method of claim 8,
And the first fluorescent material and the second fluorescent material are arranged in the first optical excitation film and the second optical excitation film in a lattice pattern. The method of claim 6,
Each of the first and second LGPs has a reflection pattern formed therein to diffuse or scatter light. A first light guide plate;
A second light guide plate stacked on the first light guide plate;
A reflection plate disposed under the second light guide plate;
A first plurality of light emitting elements and a second plurality of light emitting elements optically coupled to sides of each of the first light guide plate and the second light guide plate; And
A first optical excitation film and a second optical excitation film disposed between each of the first light guide plate and the first plurality of light emitting elements and between the second light guide plate and the second plurality of light emitting elements,
The first plurality of light emitting devices include a warm white LED emitting a correlated color temperature in a range of 2000K to 3000K and a cool white LED emitting a correlated color temperature in a range of 5500K to 6500K. Including,
The second plurality of light emitting devices includes the warm white LED and the cool white LED.
The warm white light emitting device (Warm white LED) and the cool white light emitting device (Cool white LED) is a light source device, characterized in that arranged at random. 12. The method of claim 11,
The warm white light emitting device (Warm white LED) and the cool white light emitting device (Cool white LED) light source device, characterized in that arranged in a grid pattern. 12. The method of claim 11,
And a first fluorescent material in the first light excitation film, and a second fluorescent material different from the first fluorescent material in the second light excitation film. The method of claim 13,
And the first fluorescent material and the second fluorescent material are partitioned and randomly arranged in the first optical excitation film and the second optical excitation film. The method of claim 14,
And the first fluorescent material and the second fluorescent material are arranged in the first optical excitation film and the second optical excitation film in a lattice pattern. The method of claim 13,
Each of the first and second LGPs has a reflection pattern formed therein to diffuse or scatter light.

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