WO2010117167A2

WO2010117167A2 - Led lighting apparatus, and surface emitting method for the led lighting apparatus

Info

Publication number: WO2010117167A2
Application number: PCT/KR2010/002064
Authority: WO
Inventors: 김덕용
Original assignee: Kim Duk-Yong
Priority date: 2009-04-10
Filing date: 2010-04-05
Publication date: 2010-10-14
Also published as: KR20100112978A; WO2010117167A3

Abstract

The present invention relates to an LED lighting apparatus, and to a surface emitting method for the LED lighting apparatus. The LED lighting apparatus of the present invention comprises: LEDs arranged on a substrate; a light guide plate having a bottom surface with grooves for accommodating the LEDs; an upper groove formed at a portion of the light guide plate; and a surface emission assisting member arranged in the upper groove to transmit a portion of the light emitted by the LEDs upward and to diffuse the transmitted light, and to reflect the rest of the light to the substrate. In addition, the surface emitting method for the LED lighting apparatus according to the present invention comprises the steps of: reflecting a portion of light emitted by the LEDs to the lower surface of the light guide plate, and transmitting an amount of light smaller than that of the reflected light; and diffusing the transmitted light over the LEDs to compensate for the difference in the illumination above the LEDs and in the illumination at the periphery of the LEDs caused by the reflection of light emitted by the LEDs. The thus-configured apparatus of the present invention transmits a portion of the light emitted by the LEDs to the center of reflection means for reflecting light emitted by the LEDs, and diffuses a portion of the transmitted light above the LEDs, to thereby achieve a surface emission with a uniform illumination intensity.

Description

LED lighting device and surface emitting method of LED lighting device

The present invention relates to an LED lighting device and a surface light emitting method of the LED lighting device, and more particularly to a surface lighting method of the LED lighting device and the LED lighting device capable of uniform surface light emitting.

In general, in LED lighting apparatus, it is important to evaluate the uniformity of surface emission. That is, the general LED lighting apparatus is researching that the light of the LEDs can be uniformly diffused in the light guide plate so that a constant amount of light can be emitted from the entire surface.

However, the LED lighting device is mostly brighter than the LED is located.

In order to compensate for the difference in brightness caused by the light of the LED as described above, a structure for reflecting light on the upper side of the LED has been studied, but in the case of reflecting the light of the LED in this way, the brightness of the upper side of the LED is rather There is a problem that can be darker than the surroundings to achieve a uniform surface emission.

The problem to be solved by the present invention in view of the above problems is to provide an LED lighting device and a surface light emitting method of the LED lighting device that can make the roughness of the upper side and the peripheral portion of the LED uniform.

In addition, another problem to be solved by the present invention, LED lighting device and LED lighting that can be made uniform surface emission by changing the shape of the light guide plate without changing the shape of the substrate on which the LED is mounted or the structure of the reflecting plate on the substrate The present invention provides a method for surface emitting light of a device.

LED lighting apparatus of the present invention for solving the above problems, the light guide plate having an LED mounted on the substrate, the receiving groove for accommodating the LED on the bottom, an upper groove provided in a part of the light guide plate, and the upper groove And a surface light emitting auxiliary material that transmits a part of the light emitted from the LED to the upper side, diffuses the transmitted light, and reflects the remaining light to the substrate side.

In addition, the surface light-emitting method of the LED lighting apparatus of the present invention for solving the above problems, the step of reflecting a part of the light of the LED to the lower side of the light guide plate and transmitting so that less light is reflected than the reflected light and And diffusing the transmitted light from the upper side of the LED, thereby compensating for the difference in illuminance of the upper part of the LED and the illuminance of the peripheral part according to the reflection of the light of the LED.

The present invention includes reflecting means for reflecting the light of the LED in the light guide plate of the upper side of the LED, to transmit a portion of the light in the center of the reflecting means, so that a portion of the transmitted light is diffused on the upper side of the LED As a result, there is an effect that uniform surface light emission of the upper side and the peripheral portion of the LED is achieved.

In addition, the present invention implements the structure of the other parts in a general form, and by changing only the structure of the light guide plate can be uniform surface light emission of the upper side and the periphery of the LED is easy to manufacture and reduce the manufacturing cost There is.

1 is a cross-sectional perspective view of a first embodiment of the LED lighting apparatus of the present invention.

FIG. 2 is a cross-sectional view of another embodiment of the reflective surface of FIG. 1. FIG.

3 is a cross-sectional perspective view of a second embodiment of the LED lighting apparatus of the present invention.

4 is a cross-sectional perspective view of a third embodiment of the LED lighting apparatus of the present invention.

5 is a cross-sectional view of a fourth embodiment of the LED lighting apparatus of the present invention.

6 is a sectional view of a fifth embodiment of the LED lighting apparatus of the present invention.

Hereinafter, various embodiments of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a cross-sectional configuration of the first embodiment of the LED lighting apparatus of the present invention.

Referring to FIG. 1, in the first embodiment of the LED lighting apparatus of the present invention, the LED 20 is mounted on the substrate 20 and the upper portion of the substrate 20, and the LED 10 is disposed on a portion of a bottom surface thereof. An accommodation groove 31 that can be accommodated is provided and includes a light guide plate 30 including an upper groove 32 provided on an upper side of the accommodation groove 31, and an upper groove 32 of the light guide plate 30. It is positioned to guide a part of the light of the LED to the inside and diffused so as to have a uniform illuminance with the periphery, and includes a surface light emitting auxiliary base 40 for transmitting the reflected light according to the reflection angle.

The surface light emitting auxiliary material 40 is provided at a central portion of the bottom surface which is engaged with the upper groove 32, and a light transmitting surface 41 for transmitting a part of light of the LED 10, and the light transmitting surface 41. It is provided on the inclined surface of the periphery and reflecting part of the light of the LED 10 reflects a portion 42, and provided in the form of a groove on the upper surface of the light transmission surface 41 is transmitted through the light transmission surface 41 And a reflecting groove 43 for reflecting and transmitting the light, and a diffuser 44 for uniformly diffusing the light reflected through the reflecting groove 43.

Hereinafter, the configuration and operation of the first embodiment of the LED lighting apparatus of the present invention configured as described above will be described in more detail.

First, it is preferable that the reflective layer is formed on the surface of the substrate 20, and a plurality of LEDs 10 are mounted on the substrate 20. The LED 10 may be packaged with one or more LED bare chips or one or more LED bare chips.

The light guide plate 30 is attached to the upper portion of the substrate 20 to diffuse the light emitted from the LED 10 to enable surface emission. At this time, in order to accommodate the LED 10 positioned higher than the substrate 20, the light guide plate 30 is provided with a receiving groove 31.

An air layer may be filled between the accommodating groove 31 and the LED 10, and when the LED 10 is a bare chip, an encapsulant having a refractive index different from that of the light guide plate 30 may be filled. Can be. As such, the medium filled with the air or the encapsulant filled in the accommodating groove 31 may further intensify the light diffusion due to the difference in refractive index with the light guide plate 30.

Next, an upper groove 32 is provided on a top surface of the light guide plate 30 at a position corresponding to the receiving groove 31. The shape of the upper groove 32 is a flat surface in the center portion, the inclined surface is formed so that the depth of the groove becomes shallower toward the peripheral portion.

The surface light emitting auxiliary material 40 is coupled to the upper groove 32 of the light guide plate 30. The bottom shape of the surface light emitting auxiliary base 40 is a structure that can be engaged with the upper groove 32, the inclined surface of the bottom is a reflective surface 42 which is a mirror-treated surface or a surface coated with a reflective layer is formed In the center of the upper groove 32 is provided a light transmitting surface 41 which is a flat surface.

The light transmitting surface 41 is used to transmit the light emitted from the LED 10 into the upper groove 32.

In this structure, 80 to 90% of the light emitted from the LED 10 is reflected on the

reflective surface

42, and 10 to 20% is transmitted through the light transmitting surface 41. Of course, the numerical values are merely examples and may be various numerical values.

Then, when the light transmitted through the light transmitting surface 41 is directly transmitted through the upper side of the light guide plate 30, there is a bright spot than the surroundings, it is necessary to diffuse the light again to prevent this.

To this end, the upper surface of the surface light emitting auxiliary material 40 corresponding to the light transmitting surface 41 is provided with a means for reflecting the transmitted light, the means is a reflective groove 43 in the form of a groove, the reflection The light is partially prevented from being transmitted to the outside due to the difference in refractive index between the surface of the groove 43 and the air thereon and the inclination angle of the interface thereof. Here, although the cone shape in the form of the reflective groove 43 is shown, the present invention is not limited to the cone shape in the form of the groove, it can be implemented in various forms.

As such, the light reflected from the reflecting groove 43 is reflected back from the reflecting surface 42 located on the bottom inclined surface of the surface light emitting auxiliary material 40, and the diffusion is generated in the diffusion part 44 so that the surface light emitting auxiliary material ( Uniform surface luminescence is possible on the surface of 40).

80 to 90% of the light that is not transmitted through the light transmissive surface 41 of the LED 10 is reflected by the reflecting surface 42, and the reflected light is reflected on the substrate 20 or the substrate 20. The reflection is made by the provided reflection layer, and the surface of the light guide plate 30 is uniformly emitted.

As described above, according to the first exemplary embodiment of the LED lighting apparatus of the present invention, a difference may be prevented from occurring in the roughness of the upper surface of the LED 10 and the peripheral portions other than the upper surface thereof by using a light portion of the LED 10. Uniform surface light emission can be easily performed.

2 is a configuration diagram of another embodiment of the reflective surface 42.

Referring to FIG. 2, the reflective surface 42 of the first embodiment is formed on the entire inclined bottom of the surface light emitting auxiliary base 40, but may be formed on a portion of the inclined bottom.

In this case, the light may be introduced into the diffuser 44 of the surface light emitting auxiliary base 40 through the inclined surface on which the reflective surface 42 is not formed, and the light is transmitted through the light transmitting surface 41. Can be diffused with the light.

In this way, the structure of the reflective surface 42 located on the bottom surface of the surface light emitting auxiliary base 40 is changed to reflect some of the light of the LED 10 at the position of the reflective surface 42, and the reflective surface 42 In this non-located portion, part of the light of the LED 10 may be transmitted and then diffused to adjust the reflection and the transmission ratio of the light.

The partially formed reflective surface 42 may be equally applicable to the embodiments described later.

3 is a configuration diagram of a second embodiment of the LED lighting apparatus of the present invention.

Referring to FIG. 3, in the second embodiment of the LED lighting apparatus of the present invention, a first diffusion pattern provided in the reflective groove 43 to facilitate diffusion of the diffusion portion 44 in the structure of the first embodiment. 45 and a second diffusion pattern 46 provided in the diffusion portion 44.

The first diffusion pattern 45 and the second diffusion pattern 46 are to alternately position the medium of the light, so that the more uniform diffusion can occur by the difference in refractive index between the medium.

In the drawing, although the shape of the first diffusion pattern 45 and the second diffusion pattern 46 is provided with a plurality of concentric grooves as an example, a structure in which different media can be alternately positioned according to a path of light travel is illustrated. Anything can be used.

In addition, the structure of the first diffusion pattern 45 and the second diffusion pattern 46 as described above can increase the illuminance at the corresponding position as compared with the planar shape, and the amount of light transmitted through the light transmitting surface 41 is increased. It can be configured in consideration of the ratio.

4 is a configuration diagram according to a third embodiment of the present invention the LED lighting device.

Referring to FIG. 4, the third embodiment of the LED lighting apparatus of the present invention has a structure in which a light transmission path 33 penetrates to the accommodation groove 31 and the upper groove 32 in the configuration of the second embodiment.

This structure is a structure that can transmit a portion of the light generated by the LED 10 through the light transmission surface 41 at a more accurate ratio, the same medium as air that is the internal medium of the receiving groove 31 is The light transmitting surface 41 reaches, and the light emitted from the central portion of the LED 10 is transmitted through the light transmitting surface 41 as it is.

Although the light transmission path 33 of the third embodiment is illustrated and described in the drawings added to the second embodiment, the structure in which only the light transmission path 33 is added to the first embodiment can also perform the same function. .

In addition, in the case where the reflective surface 42 is formed only in a part as shown in FIG. 2, the light transmission path 33 further includes reaching the diffuse surface 44 exposed between the reflective surfaces 42. Can be formed.

5 is a cross-sectional view according to a fourth embodiment of the LED lighting apparatus of the present invention.

Referring to FIG. 5, the fourth embodiment of the LED lighting apparatus of the present invention includes a diffusion groove 34 filled with air in the light guide plate 30, and the location of the diffusion groove 34 is the surface light emitting auxiliary material. It may be a peripheral portion of the bottom side of the (40).

That is, the surface light emitting auxiliary base 40 is in a state where only a part of the center is supported by the light guide plate 30.

The diffusion groove 34 is filled with air or a medium having a refractive index different from that of the conduit plate 30, and a part of the light generated from the LED 10 is transmitted through the light transmitting surface 41, Some of the remaining light is reflected by the reflecting surface 42, and the remaining light is refracted by the difference in refractive index of the air in the light guide plate 30 and the diffusion groove 34 to diffuse in various directions.

As described above, the fourth embodiment of the LED lighting apparatus of the present invention forms a diffusion groove 34 filled with a medium having a refractive index different from that of the light guide plate 30 in a predetermined region under the surface light emitting auxiliary substrate 40. The light emitted to the outside through the light guide plate 30 may be emitted with uniform illuminance through refraction and reflection of light passing through the formed diffusion groove 34. That is, the LED lighting apparatus according to the present invention can prevent the phenomenon that light is agglomerated so that only a specific area becomes bright in a spot form or some areas become dark.

As shown in FIG. 5, some light passes through the light transmission surface 41 and is emitted outside the light guide plate 30. In addition, some light is first reflected by the diffusion groove, secondly by the second diffusion pattern, and thirdly by the reflection surface 42 to pass through the second diffusion pattern 46 to externally the light guide plate 30. Is released. In addition, some light is first reflected by the reflective surface 42, secondly reflected by the air layer 34, and thirdly reflected by the substrate 20 to be emitted outside the light guide plate 30. In addition, some light is first reflected by the reflective surface 42 and secondly reflected by the substrate 20 to be emitted outside the light guide plate 30. As described above, the light emitted to the outside of the light guide plate 30 has a uniform illuminance.

As described above, in the fourth exemplary embodiment of the LED lighting apparatus of the present invention, the first diffusion pattern 45 and the second diffusion pattern 46 are formed on the surface of the light guide plate 30, and the formed first diffusion pattern 45 is formed. And the light guide plate 30 using diffusion and reflection of light through the diffusion groove 34 located in at least one region of the light guide plate 30 as well as diffusion using at least one of the incident angle and the reflection angle of the light by the second diffusion pattern 46. It is possible to achieve uniform diffusion and surface luminescence in front of). The first diffusion pattern 45 is illustrated in an enlarged view, and a protruding surface is formed outside the groove as shown. The protruding surface is used to transmit light.

On the other hand, when the diffusion groove 34 is filled with a portion of the light of the LED 10 and the light reflected from the reflective surface 42 with a medium having a refractive index smaller than the refractive index of the light guide plate 30, As described above, the light guide plate 30 may be refracted in a direction substantially parallel to the upper surface of the light guide plate 30, and thus, other media as well as air described above may be used.

In addition, although the diffusion groove 34 is illustrated and described as being added to the configuration of the third embodiment in FIG. 5, it may be applied in addition to the first or second embodiment.

At this time, the operation of the diffusion groove 34 is the same.

6 is a cross-sectional view of a fifth embodiment of the LED lighting apparatus of the present invention.

Referring to FIG. 6, the LED lighting apparatus according to the fifth embodiment of the present invention includes an LED 10 positioned on an upper portion of the substrate 20, and an accommodating groove 31 accommodating the LED 10. An upper groove 32 on the upper side of the 31, the light guide plate 30 located on the upper portion of the substrate 20, the light guide plate 30, the lower surface of the upper groove 32 of the light guide plate 30, It comprises a surface light emitting auxiliary base 40 for transmitting a part of the light of the LED 10 to the upper side, and reflects and diffuses the light by using a reflecting surface provided on the side portion of the upper groove (32).

The structure of the surface light emitting auxiliary base 40 will be described. The surface light emitting auxiliary base 40 provides a V-shaped reflective surface 47 with a predetermined area at a central upper side of the LED 10, and has a light transmitting hole 48 for transmitting a part of light. .

In such a configuration, the central part of the light of the LED is reflected inclined downwardly to the outside through the reflecting surface 47, and the peripheral part is transmitted upwardly inclined through the light transmission hole, and the transmitted light is transmitted through the upper groove. Reflected and diffused at the side of (32) so that uniform illuminance is realized.

As described above, the fifth embodiment of the LED lighting apparatus of the present invention reflects 80 to 90% of the light of the LED 10 and transmits the light directly to the upper side without reflecting 10 to 20%. It is to make the surface light emission of uniform illumination as a whole.

However, unlike the first to fourth embodiments, the light divergence angle of the LED 10 is usually 120 degrees, and among the light emitted from the LED 10 according to the distance between the LED 10 and the reflective surface 47. It is a structure for transmitting the light located in the periphery to the upper side, the transmitted light is reflected through a medium having a different refractive index to prevent the illumination of the upper side of the LED 10 becomes darker according to the reflection of the light.

As described above, when the LED lighting apparatus according to the present invention applies the reflector to the upper part of the LED 10 in consideration of the lightness of the upper side of the LED 10 being brighter, rather, the upper side illuminance of the LED 10 In view of the fact that it may be darker, a part of the reflecting plate may be transmitted to the upper side of the LED 10, and then the transmitted light may be dispersed, thereby achieving surface illumination with a uniform illumination as a whole.

The present invention is a structure capable of surface emission of uniform illuminance on the entire surface of the LED, it can be used in industrial fields such as lighting, display using the LED.

Claims

LED mounted on the substrate;

A light guide plate having a receiving groove at a bottom thereof to accommodate the LED;

An upper groove provided in a portion of the light guide plate; And

LED lighting device comprising a surface light emitting auxiliary material provided in the upper groove to transmit a portion of the light emitted from the LED to the upper side and diffuse the transmitted light, the remaining light is reflected to the substrate side.
The method of claim 1,

The surface light-emitting auxiliary material,

A light transmission surface for transmitting a part of light emitted from the LED to an upper side;

A reflective surface inclined at a periphery of the light transmitting surface to reflect the remaining light; And

And a reflecting groove positioned on an upper side of the light transmitting surface to reflect the light transmitted through the light transmitting surface to an upper side of the reflecting surface and transmitting the reflected light according to an incident angle.
The method of claim 2,

In the upper portion of the reflecting groove and the diffusion surface,

LED lighting apparatus, characterized in that the first diffusion pattern and the second diffusion pattern is provided so that the reflected light alternately passes through the medium of different refractive index.
The method according to claim 2 or 3,

The light transmitting surface is LED lighting device, characterized in that connected to the light transmission path for transmitting the light and the receiving groove.
The method of claim 4, wherein

And a diffused groove provided in the light guide plate at a lower side of the peripheral portion of the surface light emitting auxiliary material, and diffusing the light of the LED or the light reflected from the reflective surface to the light guide plate.
The method according to claim 2 or 3,

And a diffused groove provided in the light guide plate at a lower side of the peripheral portion of the surface light emitting auxiliary material, and diffusing the light of the LED or the light reflected from the reflective surface to the light guide plate.
The method of claim 1,

The surface light-emitting auxiliary material,

LED lighting device characterized in that to reflect the light of the central portion of the LED inclined outwardly and to transmit the remaining light inclined, the transmitted light is reflected and diffused on the side of the upper groove.
The method of claim 2,

The surface light emitting auxiliary material,

A reflection surface providing a V-shaped reflection surface to a central portion of the bottom surface; And

LED lighting device including a light transmission hole for transmitting a part of the light of the LED to the side of the upper groove in the peripheral portion of the reflective surface.
Reflecting a part of the light of the LED to the lower side of the light guide plate and transmitting the light so that less light is not reflected compared to the reflected light; And

And diffusing the transmitted light from the upper side of the LED, thereby compensating for the difference in the illumination of the upper part of the LED and the illuminance of the peripheral part according to the reflection of the light of the LED.
The method of claim 9,

The ratio of the reflected light and the transmitted light is 80 to 90: 20 to 10, characterized in that the surface light emitting method of the LED lighting apparatus.