KR101748910B1 - Light directing film for oled illuminating device and oled illuminating device comprising the same - Google Patents

Abstract

The present invention relates to a substrate; A light emitting portion formed on one side of the substrate and including a plurality of first lens structures arranged in parallel; And a light incident portion formed on the other surface of the substrate and including a plurality of second lens structures arranged in parallel, wherein the first lens structure has an inclination angle of 20 DEG to 40 DEG with respect to a plane direction of the base film And a second inclined surface having an inclination angle of 60 DEG to 90 DEG with respect to a plane direction of the base film, wherein the second lens structure has an inclination angle of 40 DEG to 55 DEG with respect to a plane direction of the base film And a fourth inclined surface having an inclination angle of 80 DEG to 90 DEG with respect to a plane direction of the base film, and an OLED lighting device including the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a light-directing film for OLED lighting, and an OLED lighting device including the same. BACKGROUND OF THE INVENTION [0002]

The present invention relates to a light directing film for OLED lighting and an OLED lighting apparatus including the same. More particularly, the present invention relates to a light directing film for OLED lighting, which is designed to improve the indoor illuminance by raising the luminous intensity in the oblique direction, .

The organic light emitting diode (OLED) is a thin film light emitting diode in which a light emitting layer is made of an organic compound, and uses an electroluminescence phenomenon that emits light when a current flows through the fluorescent organic compound.

The organic light emitting device is generally formed by sequentially laminating an anode (ITO layer), a hole injecting layer, a hole transporting layer, a light emitting layer, an electron transporting layer, an electron injecting layer and a cathode on a transparent substrate. When power is supplied, The electrons migrate to the light emitting layer with the help of the hole transport layer. Electrons and holes that are encountered in the organic light emitting layer generate excitons with high energy, which emit light as energy falls to low energy.

In recent years, research activities have been actively conducted to utilize a planar light source such as an organic light emitting device as indoor light. Generally, the position of the light needs to be changed depending on the installation position or other circumstances. However, the light emitted from the organic light emitting device generally has a strong vertical intensity and a tendency to become weaker toward the side. If such an organic light emitting device is applied to a high wall surface using a light source, there is a problem that light intensity is weakened to the side, resulting in poor efficiency of illumination.

In other words, if the light that needs to be illuminated downward as much as possible and the room that needs to brighten the room emits the most light in the vertical direction on the wall, the light is concentrated in unnecessary places and the intensity of light is concentrated .

Meanwhile, in order to solve this problem, a method of tilting the wall or installing a ceiling light has been proposed, but this has caused a problem in that it limits the design of the interior lighting.

Therefore, there is a need for a light directing film for OLED illumination that can emit light generated from the OLED light source as a planar light source in a desired direction with higher light intensity as required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a light directing film for OLED lighting and an OLED lighting device including the same, which are designed to emit light in a desired direction without limiting the interior lighting design.

The object of the present invention is not limited to the above description. It will be understood by those of ordinary skill in the art that there is no difficulty in understanding the additional problems of the present invention.

In order to solve the above-mentioned problems, one embodiment of the present invention is a liquid crystal display comprising: a substrate; A light emitting portion formed on one side of the substrate and including a plurality of first lens structures arranged in parallel; And a light incident portion formed on the other surface of the substrate and including a plurality of second lens structures arranged in parallel, wherein the first lens structure has an inclination angle of 20 DEG to 40 DEG with respect to a plane direction of the base film And a second inclined surface having an inclination angle of 60 DEG to 90 DEG with respect to a plane direction of the base film,

The second lens structure includes a third inclined surface having an inclination angle of 40 to 55 with respect to the plane direction of the base film and a fourth inclined surface having an inclination angle of 80 to 90 with respect to the plane direction of the base film And a light directing film for OLED illumination.

Another embodiment of the present invention includes an OLED light source; And a light directing film disposed on the OLED light source, wherein the light directing film comprises a substrate, a light emitting portion formed on one surface of the substrate and including a plurality of first lens structures arranged in parallel, Wherein the first lens structure includes a first lens structure having a first inclined angle of 20 DEG to 40 DEG with respect to a plane direction of the base film, and a second lens structure including a plurality of second lens structures arranged on a second surface of the base film, And a second inclined surface having an inclination angle of 60 DEG to 90 DEG with respect to a plane direction of the base film, and the second lens structure has an inclination angle of 40 DEG to 55 DEG with respect to a plane direction of the base film A third inclined surface, and a fourth inclined surface having an inclination angle of 80 DEG to 90 DEG with respect to a plane direction of the base film.

In addition, the solution of the above-mentioned problems does not list all the features of the present invention. The various features of the present invention and the advantages and effects thereof will be more fully understood by reference to the following specific embodiments.

When the light-directing film for OLED illumination according to the present invention is used, the luminance of light can be concentrated in one direction in the OLED lighting device, and light directed to an unnecessary part such as a ceiling can be reduced, , It is possible to concentrate the light in a desired direction without modifying the design of the OLED lighting device.

Further, it is possible to concentrate light only on a necessary portion without changing the space in which the OLED lighting device is installed, and space utilization can be maximized.

1 is a view for explaining a light directing film for OLED illumination according to an example of the present invention.
2 is a view showing a vertical sectional shape of a light directing film for OLED illumination according to an example of the present invention.
3 is a view showing an outgoing light distribution of a conventional OLED lighting apparatus.
Figs. 4 to 23 are graphs showing the emission distribution of the OLED illumination devices of Examples 1 to 20, respectively.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

The inventors of the present invention have conducted research to develop an OLED lighting device that emits more light in a desired direction as needed without being restricted by design. As a result, it has been found that a light-directing film having a specific shape is formed on an OLED light source The present invention has been accomplished on the basis of these findings.

First, the light directing film for OLED illumination of the present invention will be described. FIG. 1 shows an example of a light directing film for OLED illumination according to the present invention, and FIG. 2 is a view showing a vertical sectional shape of the light directing film of FIG. Here, the vertical section means a section when the light directing film is cut in a direction perpendicular to the plane direction of the substrate.

1 and 2, the light directing film for illumination according to the present invention comprises a substrate 100; A light emitting unit 200 formed on one surface of the substrate 100 and including a plurality of first lens structures 210, 220, and 230 arranged in parallel; And a light incoming portion 300 including a plurality of second lens structures 310, 320, and 330 formed on the other surface of the substrate 100 and arranged in parallel. The light emitted from the light source of the illumination device enters through the light-incident portion 300, passes through the substrate 100, and is then discharged through the light-emitting portion 200.

The substrate 100 supports the light-incident portion 300 and the light-emitting portion 200. Transparent films widely used for a display optical film and an illumination light-directing film can be used without limitation, But it may, for example, be a polycarbonate film, an acrylic film, a cellulose film or a cycloolefin film.

The light emitting unit 200 is configured to emit light to the outside and includes a plurality of first lens structures 210, 220 and 230 arranged in parallel with each other. 1, the first lens structure has a structure in which two inclined surfaces extending in one direction, that is, a first inclined surface 211 and a second inclined surface 212 are in contact with each other .

The light-incident portion 300 allows the light emitted from the light source to enter the inside of the light directing film. The plurality of second lens structures 310, 320, and 330 are arranged in parallel with each other, 1, the second lens structure has a structure in which two inclined surfaces extending in one direction, that is, a third inclined surface 311 and a fourth inclined surface 312 are in contact with each other . In the present invention, for convenience, the inclined surface disposed facing the first inclined surface of the light emitting portion is referred to as a third inclined surface, and the inclined surface disposed facing the second inclined surface of the light emitting portion is referred to as a fourth inclined surface.

In the light directing film of the present invention, it is preferable that the first lens structure and the second lens structure are arranged so that their extending directions are parallel to each other. Further, the first inclined surface and the second inclined surface constituting the first lens structure, the third inclined surface and the fourth inclined surface forming the second lens structure each have a specific inclination angle. Specifically, the inclination angle? ₁ of the first inclined plane is about 20 to 40, preferably about 25 to 35, and the inclination angle? ₂ of the second inclined plane is about 60 to 90 Deg.], Preferably about 65 [deg.] To 85 [deg.]. The inclination angle? ₃ of the third inclined surface is about 40 to 55 degrees, preferably about 45 to 50 degrees, and the inclination angle? ₄ of the fourth inclined surface is about 80 to 90 degrees .

According to the study of the present inventors, when a light directing film including a first lens structure and a second lens structure made of slopes satisfying the above-mentioned numerical value range is applied to an OLED lighting device, Becomes larger than the amount of light output in the other direction, and as a result, bright light can be provided in a desired place.

Meanwhile, in the present invention, the pitch (P ₁ ) of the first lens structures is preferably 10 탆 to 500 탆, but is not limited thereto. For example, 20 탆 to 200 탆 or 40 Mu m to 100 mu m. The pitch (P ₂ ) of the second lens structures is not limited to this, but is preferably 10 μm to 500 μm, for example, 20 μm to 200 μm or 40 μm to 100 μm . Here, the pitch means a distance between vertices of neighboring lens structures. If the pitch between the lens structures is less than 10 탆, it is difficult to produce a mold. If the pitch is larger than 500 탆, the height of the lens structure is increased to increase the manufacturing cost by increasing the volume of the lens. The uniformity may be lowered and the appearance quality may be deteriorated.

Meanwhile, although not limited thereto, it is preferable that the pitch (P ₁ ) between the first lens structures and the pitch (P ₂ ) between the second lens structures are different from each other in terms of moire prevention. If the pitch between the first lens structures and the pitch between the second lens structures are the same, a Moire phenomenon may occur, which is an interference pattern generated when two or more periodic patterns are overlapped.

On the other hand, the portion of the first lens structures that is in contact with the first inclined surface and the second inclined surface, and / or the portion where the third inclined surface and the fourth inclined surface of the second lens structure are in contact with each other, Or may have a curved shape with a curvature. When the apex portion of the lens structure is formed in a curved surface shape, the lens structure can be prevented from being damaged by an external impact and the surface appearance can be improved.

Meanwhile, the first lens structure and the second structure may be formed using materials for forming lens structures widely known in the art, for example, a photocurable or thermosetting resin composition, It is not. For example, the first lens structure and the second lens structure may be formed of any one or a mixture of two or more of acrylate, epoxy acrylate, ester acrylate, and radical generating monomer.

Preferably, the lens structure may be formed of a curable resin composition having a refractive index of 1.5 to 1.6. If the lens structure satisfies the refractive index range, it can be optimized so that light can be directed in a desired direction.

On the other hand, the light directing film of the present invention can be manufactured by a method of manufacturing an optical film including a lens structure well known in the art, and the manufacturing method is not particularly limited. For example, in the case of using a resin, a curable resin may be poured between a substrate and a metal mold having a desired shape, and then cured using ultraviolet rays or heat. In the case of plastic or glass, And then injecting a melt of plastic or glass into the mold and then cooling it. In the case of glass, it may be formed by an etching process such as reactive ion etching (RIE).

Next, the OLED lighting device of the present invention will be described. The OLED device of the present invention is characterized in that the above-mentioned light directing film of the present invention is arranged on an OLED light source. That is, the OLED lighting apparatus of the present invention includes: an OLED light source; And a light directing film disposed on the OLED light source, wherein the light directing film comprises a substrate, a light emitting portion formed on one surface of the substrate and including a plurality of first lens structures arranged in parallel, Wherein the first lens structure includes a first lens structure having a first inclined angle of 20 DEG to 40 DEG with respect to a plane direction of the base film, and a second lens structure including a plurality of second lens structures arranged on a second surface of the base film, And a second inclined surface having an inclination angle of 60 DEG to 90 DEG with respect to a plane direction of the base film, and the second lens structure has an inclination angle of 40 DEG to 55 DEG with respect to a plane direction of the base film A third inclined surface and a fourth inclined surface having an inclination angle of 80 DEG to 90 DEG with respect to a plane direction of the base film.

Here, as the OLED light source, organic light emitting devices well known in the art can be used without limitation and are not particularly limited. Since the structure, material, manufacturing method and the like of the light directing film are the same as those described above, detailed description is omitted.

Hereinafter, the behavior of the light emitted from the OLED light source when the light directing film of the present invention is mounted on the OLED lighting apparatus will be described in more detail.

FIG. 3 is a graph showing an outgoing light distribution of a conventional OLED lighting apparatus. When the normal direction of the light source is a reference angle of 0 DEG and one direction is + direction and the opposite direction is -direction with reference to the reference angle, And has an emission distribution in which the luminance gradually decreases as the distance from the reference angle increases. At this time, the outgoing light distribution has a substantially symmetrical shape about the reference angle. That is, there is not a large difference in the outgoing light distribution in the + direction and the - direction.

However, in the case of the OLED lighting apparatus of the present invention, the light emitted from the light source passes through the light directing film including the first lens structure and the second lens structure having an asymmetric triangular shape, and exhibits an outgoing light distribution deviated in one direction. This is because the cross-sectional shape of the second lens structures of the light-entering portion is asymmetrical, the amount of light refracted in one direction among the light incident through the second lens structure becomes relatively larger than the amount of light refracted in the opposite direction, This is because the incident light is refracted or reflected by the asymmetric first lens structure, and more light is directed in one direction.

More specifically, in the case of an OLED lighting device equipped with the light directing film of the present invention, the amount of light emitted in an angle range of 0 ° to -90 ° based on the normal direction of the OLED lighting device is 0 ° to + 90 ° Of the total amount of light, and the amount of light emitted in the angular range of -35 DEG to + 5 DEG is about 60% to 90%, preferably about 75% to 85% of the total amount of light. That is, in the case of the lighting apparatus according to the present invention, compared with the conventional lighting apparatus emitting light in a similar direction in both directions, by increasing the amount of light emitted in a specific direction, it is possible to solve the problem that luminance is lowered from the side, It is possible to provide a high brightness in a required space.

Hereinafter, the present invention will be described more specifically by way of specific examples.

Examples 1 to 20

The inclination angle? ₁ of the first inclined plane, the inclination angle? ₂ of the second inclined plane, the inclination angle? ₃ of the third inclined plane and the inclination angle? ₄ of the fourth inclined plane are configured as described in Table 1 below The light emission distribution when the light directing film was mounted on the OLED light source was measured by optical simulation.

The optical simulation was performed by measuring the light distribution of the OLED illumination using an optical measuring device called Radiant's Imaging Sphere, and then using the simulation program of BRO's ASAP, the emission distribution of the OLED illumination, the structure of the light directing film for OLED illumination And a luminance meter were modeled, and then the distribution of light reaching the luminance meter was graphically displayed. The light distribution measurement results of Examples 1 to 20 are shown in Figs. 4 to 23. Fig.

division θ ₁ (°) θ ₂ (°) θ ₃ (°) θ ₄ (°) Example 1 35 70 45 90 Example 2 30 75 45 90 Example 3 35 75 45 90 Example 4 35 80 45 90 Example 5 30 80 50 90 Example 6 30 70 50 90 Example 7 30 80 45 90 Example 8 30 85 45 90 Example 9 30 75 50 90 Example 10 35 85 45 90 Example 11 30 70 45 90 Example 12 30 80 45 85 Example 13 25 80 50 90 Example 14 30 65 50 90 Example 15 30 85 50 85 Example 16 30 85 50 90 Example 17 35 65 45 90 Example 18 25 75 50 90 Example 19 25 85 50 90 Example 20 30 75 50 85

On the other hand, Table 2 below shows the light directivity ratios of Examples 1 to 20 calculated through the simulation results. The light directivity ratio is a numerical value obtained by dividing an amount of light emitted at an output angle of 0 DEG to 90 DEG at an output angle of 0 DEG to -90 DEG. That is, in the case of conventional general optical films, since the light emission rate is symmetrically expressed with respect to 0 °, the light directing ratio is almost close to 1, whereas in Examples 1 to 20, The rate is 2 or more.

division Light-oriented rate Example 1 2.54985 Example 2 2.53666 Example 3 2.51393 Example 4 2.5038 Example 5 2.49959 Example 6 2.47651 Example 7 2.47011 Example 8 2.46679 Example 9 2.46119 Example 10 2.44563 Example 11 2.41339 Example 12 2.39229 Example 13 2.38307 Example 14 2.37216 Example 15 2.35032 Example 16 2.3427 Example 17 2.31744 Example 18 2.29546 Example 19 2.28964 Example 20 2.28088

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

100: substrate
200: first lens structures
210, 220, and 230: a first lens structure
211: first inclined surface
212: second inclined surface
300: second lens structures
310, 320, 330: a second lens structure
311: third slope
312: fourth slope
P ₁ : Pitch between the first lens structures
P ₂ : Pitch between the second lens structures
θ ₁ : inclination angle of the first inclined surface
θ ₂ : inclination angle of the second inclined surface
? ₃ : inclination angle of the third inclined surface
θ ₄ : inclination angle of the fourth inclined surface

Claims (14)

materials; A light emitting portion formed on one side of the substrate and including a plurality of first lens structures arranged in parallel; And a light incoming portion formed on the other surface of the substrate and including a plurality of second lens structures arranged in parallel,
Wherein the first lens structure and the second lens structure have an asymmetrical shape,
Wherein the first lens structure comprises a first inclined surface having an inclination angle of 25 to 35 degrees with respect to a plane direction of the base material and a second inclined surface having an inclination angle of 65 to 85 with respect to the plane direction of the base material,
Wherein the second lens structure includes a third inclined surface having an inclination angle of 45 DEG to 50 DEG with respect to the plane direction of the base material and a fourth inclined surface having an inclination angle of 85 DEG to 90 DEG with respect to the plane direction of the base material, Light Oriented Film.
The method according to claim 1,
Wherein a pitch between the first lens structures is 10 to 500 占 퐉.
The method according to claim 1,
Wherein a pitch between the second lens structures is 10 to 500 占 퐉. The method according to claim 1,
Wherein the pitch between the first lens structures and the pitch between the second lens structures are different from each other.
The method according to claim 1,
Wherein the portion where the first inclined surface and the second inclined surface are in contact is a curved surface.
The method according to claim 1,
Wherein the portion where the third inclined surface and the fourth inclined surface are in contact with each other is a curved surface.
OLED light source; And
A light directing film disposed on the OLED light source,
The light directing film comprises a substrate, a light emitting portion formed on one surface of the substrate and including a plurality of first lens structures arranged in parallel, and a plurality of second lenses formed on the other surface of the substrate, And a light-incoming portion including structures,
Wherein the first lens structure and the second lens structure have an asymmetrical shape,
Wherein the first lens structure comprises a first inclined surface having an inclination angle of 25 to 35 with respect to a plane direction of the substrate and a second inclined surface having an inclination angle of 65 to 85 with respect to the plane direction of the base, Wherein the second lens structure includes a third inclined surface having an inclination angle of 45 DEG to 50 DEG with respect to a plane direction of the substrate and a fourth inclined surface having an inclination angle of 85 DEG to 90 DEG with respect to the plane direction of the base material, Device.
8. The method of claim 7,
And a pitch between the first lens structures is 10 to 500 占 퐉.
8. The method of claim 7,
And the pitch between the second lens structures is 10 to 500 占 퐉.
8. The method of claim 7,
Wherein a pitch between the first lens structures and a pitch between the second lens structures are different from each other.
8. The method of claim 7,
Wherein a portion where the first inclined surface and the second inclined surface are in contact is a curved surface.
8. The method of claim 7,
And the portion where the third inclined surface and the fourth inclined surface are in contact with each other is a curved surface.
8. The method of claim 7,
Wherein an amount of light emitted in an angle range of 0 ° to -90 ° with respect to a normal direction of the OLED lighting apparatus is at least twice as large as an amount of light emitted in an angle range of 0 ° to + 90 °.
8. The method of claim 7,
Wherein an amount of light emitted in an angular range of -35 [deg.] To +5 [deg.] With respect to a normal direction of the OLED lighting device is 75% to 85% of the total amount of light.

Images