KR20150002969A - Light-diffuser unit - Google Patents

Light-diffuser unit Download PDF

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Publication number
KR20150002969A
KR20150002969A KR20130074853A KR20130074853A KR20150002969A KR 20150002969 A KR20150002969 A KR 20150002969A KR 20130074853 A KR20130074853 A KR 20130074853A KR 20130074853 A KR20130074853 A KR 20130074853A KR 20150002969 A KR20150002969 A KR 20150002969A
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KR
South Korea
Prior art keywords
light
present
degrees
distribution
main body
Prior art date
Application number
KR20130074853A
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Korean (ko)
Inventor
문경식
이경일
김광일
김영덕
Original Assignee
주식회사 포스코
철강융합신기술연구조합
재단법인 포항산업과학연구원
주식회사 포스코엘이디
포항공과대학교 산학협력단
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Application filed by 주식회사 포스코, 철강융합신기술연구조합, 재단법인 포항산업과학연구원, 주식회사 포스코엘이디, 포항공과대학교 산학협력단 filed Critical 주식회사 포스코
Priority to KR20130074853A priority Critical patent/KR20150002969A/en
Publication of KR20150002969A publication Critical patent/KR20150002969A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention discloses a light diffusion apparatus capable of adjusting the luminance distribution to enhance the lighting quality. The light diffusion apparatus according to an embodiment of the present invention adjusts the light distribution to reduce the glare and increases the uniformity to enhance the lighting quality. The light diffusion apparatus according to an embodiment of the present invention, which is used to diffuse the light emitting from the light source of a planar illumination device, includes: a body unit which is provided to face the upper part of the planar illumination device and lets the light emitted from the light source pass through; and multiple pyramid-shaped or prism-shaped structure units which are arranged on the upper part of the body unit. The adjacent surfaces of the structures meet each other at the angle of 110 to 130 degrees.

Description

TECHNICAL FIELD [0001] The present invention relates to a light-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light diffusion device, and more particularly, to an improved light diffusion device capable of uniformly adjusting a light distribution of light.

In general, a liquid crystal display device is a thin plate-shaped display device, and does not include its own light emitting means, thereby providing a light emitting unit for light emission.

A surface illuminator is mainly used for such a light emitting unit. As such a surface lighting device, a backlight unit is typical, and CCFL (Cold Cathode Fluorescent Lamp) and LED (Light Emitting Diode) are typically used depending on the light source used.

On the other hand, the light source used in the plane illumination device is a concentrated light source, and light is emitted to a partial region, and accordingly, a light diffusion device is used to emit light in a uniform overall area.

For example, the light diffusing device can be largely classified into a sheet form or a plate form, and is widely called a diffusion sheet or a diffusion plate according to such a division.

The light diffusing device is provided to diffuse a light source emitted from a light source through a reflection and transmission process to a uniform light source. As the light source spreads, the front surface is totally emitted in a whirly manner, and the shape on the back surface is not visible.

In addition, such a light diffusing device is used to uniformly spread a hot spot of an LED, a CCFL, or the like as a whole, thereby reducing glare and variation in light quantity.

On the other hand, light passing through the light diffusing device is scattered in an arbitrary direction, so that the light distribution distribution of light passing through the light diffusing device has a Lambertian distribution.

In order to improve the quality of the illumination, it is necessary to develop a technique for adjusting the distribution of the light distribution to reduce the glare and increase the uniformity.

Korean Patent Laid-Open Publication No. 10-2012-0061023 Korean Patent Registration No. 10-0582926

It is an object of the present invention to provide an improved light diffusing device for improving the illumination quality by reducing the glare and adjusting the light distribution by adjusting the light distribution.

A light diffusing apparatus according to an embodiment of the present invention is a light diffusing apparatus for diffusing and passing light irradiated from a light source of a plane illumination apparatus, and is provided corresponding to an upper part of the plane illumination apparatus, ; And a plurality of prisms or pyramidal structures provided on the top of the body, wherein the angle between the adjacent sides of the structure is between 110 and 130 degrees.

In addition, the structural part may be formed by protruding or recessing from the upper surface of the main body part.

In addition, the light diffusion devices having the prism-shaped structure portions may be provided in a plurality of layers in a crossed manner.

Also, the structural part may be provided rotated by 45 degrees about the circumference of the main body part.

According to an embodiment of the present invention, by optimizing the angles of the prism or pyramid-shaped structural parts provided in the light diffusion device to eliminate side lobes and symmetrically the light distribution, glare can be reduced and uniformity can be increased.

1 is a plan view showing a light diffusion device according to an embodiment of the present invention;
FIG. 2 is an enlarged perspective view of a part of a light diffusion device according to an embodiment of the present invention; FIG.
3 is an enlarged perspective view of a part of a light diffusion device according to another embodiment of the present invention.
4 is a plan view showing a state in which the light diffusion device is provided at an inclined angle;
5 is a graph showing a light distribution distribution of a light diffusion device having a pyramid structure portion.
FIG. 6 is an enlarged perspective view of a part of a light diffusion device according to another embodiment of the present invention; FIG.
7 is a perspective view illustrating a light diffusion device according to another embodiment of the present invention.
8 is a graph showing a light distribution distribution of a light diffusion device having a prism structure portion.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 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. The shape and the size of the elements in the drawings may be exaggerated for clarity and the same elements are denoted by the same reference numerals in the drawings.

FIG. 1 is a plan view showing a light diffusion device according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of a part of a light diffusion device according to an embodiment of the present invention.

Referring to Figs. 1 and 2, the light diffusing apparatus 10 of the present embodiment is a device for diffusing and passing light irradiated from a light source of a surface illuminator.

For example, a backlight unit (black-light unit) is a representative example of a surface lighting apparatus, and CCFL (Cold Cathode Fluorescent Lamp) and LED (Light Emitting Diode) are typically used depending on a light source used. In addition, the surface illuminator may be provided for imparting the brightness of the liquid crystal panel and may be provided in a generally rectangular shape, but the shape of the surface illuminator and the optical diffuser provided therein is not limited and may be formed in various shapes .

Also, the light diffusing device 10 may include a main body part 12 provided corresponding to an upper part of the surface illuminating device and adapted to emit light irradiated from the light source.

Herein, the main body portion 12 may be divided into a sheet form or a plate form, but the present invention is not limited thereto. The main body portion 12 may include various shapes such as a film, a sheet, a plate, .

In addition, the main body 12 may be provided on one side of the surface illuminator so that the light reflected by the light source of the surface illuminator may be reflected or refracted in the process of being transmitted to the front surface.

On the other hand, a plurality of pyramid-shaped structural parts 14 may be provided on the upper part of the main body part 12.

The pyramid-shaped structure portion 14 can function to condense or distribute the transmitted light.

In the present embodiment, the structural portion 14 may be provided with an internal angle of 110 to 130 degrees formed by the adjoining surfaces, that is, the vertical lines connecting the vertexes of the adjacent inclined surfaces forming the pyramid shape.

In the process of condensing or distributing the light passing through the main body 12 when the angle formed by the adjacent surfaces, that is, the angle of the vertical line connecting the vertexes of the adjacent inclined surfaces formed by the pyramid-shaped inclined surfaces is 110 degrees or more, The side lobe can be suppressed. Side lobes must be removed in terms of lighting glare improvement, since they directly adversely affect glare.

In addition, when the angle formed by the adjacent surfaces, that is, the angle of the vertical line connecting the vertexes of the adjacent slopes formed by the pyramid-shaped inclined surfaces is 130 degrees or less, the light distribution distribution in the direction of 0 degrees and 90 degrees becomes similar, The outgoing light is illuminated symmetrically on the floor, which gives the ideal light distribution in terms of glare and uniformity of illumination. That is, in the present embodiment, the UGR (Unified Glare Rating) value may be maintained at 15 to 20 and the uniformity may be maintained at 90% or more when the angle of the angle formed by the adjacent surfaces is 130 degrees or less .

For example, the lower the UGR value, the lower the glare, which is a good environment. In a typical office environment, the UGR value is maintained at about 22. Therefore, it can be seen that the optical diffusion device of this embodiment is a good environment in which the UGR value is lower in glare compared to a normal office environment.

In addition, the uniformity is the uniformity or uniformity of illumination of the illuminated area, and normally, normal life is possible without problems if it is 70% or more. This uniformity means that there is no difference in partial brightness in the region where the light is illuminated as the homogeneity approaches 100%, and it is found that the uniformity in the present embodiment is an ideal light distribution having a brightness difference of 90% or more in the region irradiated with light .

3 is an enlarged perspective view of a part of a light diffusion device according to another embodiment of the present invention.

In this embodiment, the structural portion is formed to protrude from the upper surface of the body portion. However, as shown in FIG. 3, the structural portion may be formed in an inverted structure, that is, a depressed shape on the upper surface.

3, the light diffusing device 30 may be formed in a shape in which the structural part 34 is recessed from the upper surface of the main body part 32. In this case, It is preferable that the first electrode 34 is provided so as to have a thickness capable of being formed.

The angle formed by the adjacent surfaces, that is, the imaginary pyramid shape, of the inclined plane may be 110 to 130 degrees.

Fig. 4 is a plan view showing a state in which the light diffusing device is provided at an inclined angle, the surface illuminating device is provided in a rectangular shape, and the corresponding light diffusing device can also be provided in a rectangular shape.

In addition, the structural parts 14 and 34 provided to the light diffusing devices 10 and 30 can be provided rotated by 45 degrees about the periphery of the body parts 12 and 32, May be more advantageous in terms of glare and uniformity as it is provided rotated. This is because the light distribution through the light diffusing device at 0 degrees or 90 degrees is wider than the light distribution at 45 degrees or 135 degrees.

That is, the space in which the normal illumination is provided is provided in a quadrangle, and since the light diffusers 10 and 30 are installed to be rotated by 45 degrees with respect to the space, the light source It can be investigated.

FIG. 5 is a graph showing a light distribution distribution of a light diffusion device having a pyramid structure portion. Referring to FIG. 5, it can be seen that the side lobe of the light diffusion device of the present embodiment is formed small. It can be seen that the size of the side lobes is gradually reduced as the angle formed by the adjacent surfaces of the light diffusers 10 and 30 of the present embodiment is gradually decreased. It can be seen that the side lobes are almost disappeared at about 110 degrees, It can be seen that the side lobe completely disappeared at about 120 degrees.

Thus, in this embodiment, it can be seen that there is no glare when the angle formed by the adjacent side of the structural part is about 120 degrees. Considering this, when the angle formed by the adjacent side of the structural part is about 110 to 130 degrees, It can be confirmed that there is almost no influence on

In addition, it can be seen that the light distribution devices 10 and 30 of the present embodiment are similar in light distribution distribution of light in the horizontal direction and the vertical direction, and it is understood that light is symmetrically irradiated through the light source.

6 is an enlarged perspective view of a part of a light diffusion device according to another embodiment of the present invention.

Referring to FIG. 6, the light diffusing device 60 may include a main body portion 62 provided corresponding to an upper portion of the surface illuminating device, to which light irradiated from the light source is incident.

Here, the main body portion 62 may be divided into a sheet form or a plate form, but the present invention is not limited thereto, and the main body portion 62 may include various shapes such as a film, sheet, plate, .

In addition, the main body 62 may be provided on one side of the surface illuminator so that the light reflected from the light source of the illuminator may be reflected or refracted in the process of passing through the surface.

On the other hand, a plurality of prism-shaped structural portions 64 may be provided on the upper portion of the body portion 62.

The prism-shaped structure portion 64 can function to condense or distribute the transmitted light.

In the present embodiment, the structural portion 64 may be provided with an internal angle of 110 to 130 degrees formed by a vertex angle, that is, a prism-shaped inclined surface.

7 is a perspective view illustrating a light diffusion device according to another embodiment of the present invention.

Referring to FIG. 7, the light diffusing device 50 of the present embodiment may be provided by stacking a plurality of layers of light diffusing devices 60 and 70 having prism-like structure portions 64 and 74 in an intersecting manner.

That is, the light diffusing apparatus 50 of this embodiment can be arranged orthogonally with the respective light diffusing apparatuses 60 and 70 arranged vertically and 90 degrees inclined from each other, The transmitted light can be more uniformly distributed in the course of passing through the plurality of light diffusing apparatuses, and the uniformity can also be improved.

In the light diffusers 50, 60, and 70 having such a structure, when a vertex angle of a structural portion, that is, an inner angle formed by a prism-shaped slant surface is 110 degrees or more, a process of condensing or distributing light passing through the body portions 62 and 72 The side lobe can be suppressed.

In addition, the structural parts 64 and 74 have an ideal light distribution in terms of glare and uniformity of illumination when the interior angle formed by a vertex angle, that is, a prism-like inclined surface is 130 degrees or less. That is, in the present embodiment, when the interior angle of the vertex angle is 130 degrees or less, the UGR (Unified Glare Rating) value for the uneven luminance is maintained at 20 or less and the uniformity can be maintained at 90% or more have.

FIG. 8 is a graph showing a light distribution distribution of a light diffusion device having a prism structure. Referring to FIG. 8, it can be seen that the side lobes of the light diffusion devices 60 and 70 of the present embodiment are formed to be small. In addition, it can be seen that the size of the side lobes is gradually reduced as the angle formed by the adjacent surfaces of the light diffusion devices 60 and 70 of the present embodiment is gradually decreased, and it can be seen that the side lobes are almost disappeared at about 110 degrees, It can be seen that the side lobe completely disappeared at about 120 degrees.

In addition, it can be seen that the light distribution devices 60 and 70 of the present embodiment are similar in light distribution distribution of light in the horizontal direction and the vertical direction, and the light is symmetrically irradiated through the light source.

Therefore, in this embodiment, it can be seen that the side lobe is in an optimal state without glare when the angle formed by the adjacent surface of the structural part is about 120 degrees. Considering this, the angle formed by the adjacent surface of the structural part is about 110 degrees to 130 degrees It can be confirmed that there is almost no influence on the glare.

As described above, when a light diffusing apparatus to which a constructed pyramid and a prism structure are applied is applied to a surface lighting apparatus, the light distribution, UGR, and uniformity can be found through experiments as shown in Table 1.

Figure pat00001

Thus, with reference to Table 1, the light diffusing device of this embodiment has an angle formed by the apex angle of the structural part based on the evaluation conditions of the ceiling height: 2.8 m, the backlight arrangement: 3 m (width and height) and the back light flux: 4300 lm 120 degrees, it can be seen that all of the shapes of the structural part have a good light distribution, and that UGR and uniformity are also good.

It is to be understood that within the scope of the technical idea included in the specification and drawings of the present invention, the description of the present invention, the present embodiment, and the drawings attached hereto are only a part of the technical idea included in the present invention, The present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the scope of the present invention.

10: light diffusing device 12:
14:

Claims (4)

A light diffusing device for diffusing and passing light irradiated from a light source of a plane illumination device,
A main body provided to correspond to an upper portion of the surface illuminator and to which light emitted from the light source is incident; And a plurality of prism or pyramid-shaped structural parts provided on an upper portion of the main body part,
Wherein an angle formed between the adjacent surfaces of the structural portion is 110 to 130 degrees. The method according to claim 1,
Wherein the structural portion is formed by projecting or recessing from an upper surface of the main body portion. The method according to claim 1,
Wherein the light diffusing device having the prismatic structure part is provided in a plurality of layers in a crossed manner. The method according to any one of claims 1 to 3,
Wherein the structural portion is provided rotated by 45 degrees around the periphery of the main body portion.
KR20130074853A 2013-06-27 2013-06-27 Light-diffuser unit KR20150002969A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114077096A (en) * 2020-08-21 2022-02-22 株式会社Lms Optical film, backlight unit and liquid crystal display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114077096A (en) * 2020-08-21 2022-02-22 株式会社Lms Optical film, backlight unit and liquid crystal display device

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