KR101165128B1 - Diffuser Plate - Google Patents

Abstract

The present invention relates to a diffuser plate having a pattern having a specific shape on its surface, and can provide a diffuser plate capable of providing a display having excellent processability and excellent light uniformity and front brightness.

Description

Diffuser Plate

The present invention relates to a diffuser plate for a backlight unit of a liquid crystal display device, and more particularly, to a diffuser plate having a pattern shape on its surface.

Liquid crystal display (LCD) is not a self-luminous device that emits light like PDP (Plasma Display Panel), but a device that displays an image with light passing through the light that is adjusted according to the liquid crystal that changes according to the signal. to be.

Since the liquid crystal display does not emit light by itself, the liquid crystal display has a light source unit under the display device. The light source unit has a light source for directly generating light and a plurality of optical components to distribute light evenly from the light source to the front surface. This is called a backlight unit.

The light source is a line light source and a light emitting diode (Light) represented by a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), a hot cathode fluorescent lamp (HCFL), and the like. Point light sources represented by Emitting Diodes (LEDs) and the like, and surface light sources represented by flat fluorescent lamps (FFL).

At this time, the line light sources such as CCFL and EEFL and the point light sources such as LEDs do not provide light evenly at the front, but light at a specific area, except for surface fluorescent lamps. Will play a role.

Liquid crystal display devices are classified into two types. One is a direct type backlight unit, and the other is an edge type backlight unit. The direct type backlight unit has a light source evenly distributed when viewed from the front of the liquid crystal display device. The LEDs having a surface light source FFL, or a line light source CCFL, EEFL, or point light source The shape is distributed evenly on the bottom of the backlight unit. Most TVs use direct backlight units. Edge type backlight unit is used to arrange CCFL, EEFL in the form of line light source or LEDs in the form of point light source along one or more corners of backlight unit when viewed from the front of liquid crystal display. It is used.

The diffusion plate is placed on the light source of the direct type backlight unit. The diffuser plate has two roles.

The first is the support of the sheets (sheets) to rise on the diffusion plate. Light sources such as CCFLs, EEFLs, and LEDs are placed inside the backlight unit, and optical components are placed thereon at regular intervals. Therefore, if only sheets are placed, the sheets may be struck down to achieve the desired performance. Therefore, in order to maintain a constant shape, the diffusion plate is placed on the light source, and the sheets are placed thereon.

The second is the role of light diffusion. The liquid crystal display has almost uniform brightness on the front side except for the edge when viewed from the front side. However, most of the backlight unit includes a line light source such as CCFL, EEFL or a point light source such as LED. In this case, the upper part of the light source shows high luminance, but there is a dark and bright part between the light source and the light source. At this time, the diffuser plate is placed directly above the light source to reduce the variation of the light and dark areas. However, since the diffuser plate exhibits a higher luminance than the portion of the upper portion of the lamp that corresponds to the boundary between the lamp and the lamp, the variation in the luminance is greatly generated. Therefore, the amount of the organic or inorganic diffuser is increased to minimize this. As a result, the luminance is lowered, resulting in a lot of light loss.

In order to improve this, in recent years, such a diffuser plate has been developed in order to further maximize the luminance of the front surface while minimizing the variation in addition to simply reducing the deviation between the support and the luminance.

The most common method is to insert a pattern on the plate surface of the diffusion plate as shown in FIG. When the prism pattern is inserted into the surface of the diffusion plate as shown in FIG. 4, the light is concentrated to the entire surface, thereby increasing the luminance and increasing the uniformity of the luminance. However, as shown in FIG. 5, which shows the path of light passing through the diffuser plate of FIG. 4, when the prism pattern is directly above the light source due to the nature of the prism, the light is refracted in the inside of the prism and directed downward, thereby causing a loss of luminance. There is also a large amount of light going out diagonally in addition to the light going straight.

Korean Unexamined Patent Publication No. 2008-29550 has a plurality of lens patterns on a surface light source, and the invention is designed to maximize luminance improvement by giving specific dimensions of the lens pattern. Korean Patent Laid-Open Publication No. 2008-62472 is an invention in which a diffuse reflection pattern is formed on a lower portion of a diffusion plate and an inverse lenticular pattern is formed on an upper portion of a diffusion plate.

A more improved form in the direction of maximizing the brightness of the front surface while reducing the deviation of the brightness is to give different characteristics to the area between the light source and the interface between the light source and the light source.

Republic of Korea Patent No. 557448 has a diffuser plate on top of a backlight unit in which a plurality of CCFL, EEFL, etc. line light sources are arranged, the slope of the pattern on one surface of the diffuser plate is small in the center of the lamp, the lamp and the lamp A triangular prism pattern having a structure that gradually increases toward an interface between them is formed to disperse light at the central portion of the lamp and to concentrate light at the interface between the lamp and the lamp. Republic of Korea Patent No. 557449 has the same effect by forming a micro lens pattern that is dense in the portion corresponding to the central position of the lamp and gradually decreases to the portion corresponding to the boundary position.

The diffuser plate shown in the above example serves to reduce the variation in luminance and increase the luminance of the front part more than the diffuser plate having no shape or simply having irregularities, but is located near the upper part of the light source and at the boundary between the light source and the light source. There is a limit in reducing luminance deviation by inserting the pattern of the same shape all around the upper part.

Republic of Korea Patent No. 644441 forms a prism pattern having a variable depth on one side of the diffuser plate at a central position of the lamp and a low depth at the interface between the lamp and the lamp through injection molding, and fine irregularities on the other side A concave-convex pattern having a face is formed. Republic of Korea Patent No. 665284 has a reflecting mirror formed on the lower surface of the optical plate corresponding to the central position of the light source to reflect the light coming from the light source to disperse the light, the interface between the light source and the light source The pattern of the right triangle was inserted in the upper surface. Korean Patent Laid-Open Publication No. 2006-116513 has a concave-convex pattern disposed on top of lamps, and the concave-convex pattern is formed corresponding to the lamps, and has a circular or polygonal shape in plan, and a cross-section is triangular or elliptic in shape. I am doing it. Korean Patent Laid-Open Publication No. 2007-12754 is one of all three-dimensional shapes that can be formed in a rectangular parallelepiped shape on an upper surface or a rear surface of a diffusion plate, and a pattern region and a non-pattern region in which a plurality of patterns formed in an embossed or intaglio are arranged are alternately formed at the same time. Diffusion plate is characterized in that the present.

In the above four examples, by inserting the upper portion of the light source and the upper portion of the portion corresponding to the boundary between the light source and the light source in different patterns or shapes, the luminance of the light source may be relatively higher while minimizing the variation in the luminance. However, in this case, the position of the upper part of the lamp and the upper part of the boundary between the lamp and the lamp and the pattern or shape of the diffuser plate must be exactly matched with each other to achieve the effect, which makes machining difficult, thereby increasing the process cost due to the higher defective rate. It must happen. In addition, by having a relatively better brightness deviation, when a portion of the diffuser plate is defective, brighter or darker smears appear than other portions, which requires high production stability.

An object of the present invention is to provide a diffuser plate having excellent processability and excellent light uniformity and front brightness.

In a preferred embodiment of the present invention, in the diffuser plate formed on the light source unit including a plurality of lamps, regions including two or more different patterns on one surface or both surfaces are periodically repeated, and include different patterns. A diffuser plate is provided that satisfies the relationship between the distance between lamp centers adjacent to each other and the center of the region.

<Formula 1>

Where a is the distance between adjacent lamp centers and b is the repetition period of the region comprising different patterns.

In the above embodiment, the distance a between adjacent lamp centers may be 2 cm or more.

In the above embodiment, the region including the different patterns may include the first pattern and the second pattern, and the length of the region where the first pattern is formed may be 1 / 3b to 2 / 3b.

In this embodiment, the region comprising different patterns from each other may be a polyhedron shape having a polygonal cross section; Hemispherical shape that is semi-circular or semi-elliptic; The cross section may include two or more patterns selected from columnar patterns that are polygonal, semi-circular or semi-elliptic.

In the above embodiment, the region including different patterns may be any one selected from among polyhedral or columnar patterns having a polygonal cross section, and at least one of vertices, tilts, pitches, and heights may include different patterns, or vertex angles. At least one of the slope, the pitch, and the height may include a sequentially decreasing pattern and a sequentially increasing pattern.

In this embodiment, the region comprising different patterns is a semi-spherical or columnar pattern whose cross section is semi-circular or semi-elliptical, wherein at least one of the pitch or height comprises a different pattern, or at least one of the pitch or height. This may include a sequentially decreasing pattern and a sequentially increasing pattern.

In this embodiment, the region comprising different patterns from each other may be a polyhedron shape having a polygonal cross section; Hemispherical shape whose cross section is semi-circular or semi-elliptic; It may include any one pattern selected from among patterns having a polygonal, semi-circular or semi-elliptic columnar shape, and an area where the pattern is not formed.

In the above embodiment, the region in which the pattern is not formed may be selected from a patternless layer, a reflective layer, a transflective reflective layer, a black matrix layer, and a foamed air layer.

In this embodiment, the region comprising different patterns from each other may be a polyhedron shape having a polygonal cross section; Hemispherical shape whose cross section is semi-circular or semi-elliptic; The cross-section may include any one pattern selected from among patterns having a polygonal shape, a semi-circle shape or a semi-ellipse shape, and a fine irregular pattern.

In this embodiment, polystyrene (PS), polycarbonate (PC), polymethylmethacrylate (PMMA), polypropylene (PP) and cyclic olefin copolymers (Cyclic Olefin Copolymer, COC ) May be one or more selected.

The diffusion plate according to the embodiment may further include diffusion particles.

According to another preferred embodiment of the present invention, a light source unit including a plurality of lamps; And it provides a backlight unit assembly including the diffusion plate.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to the accompanying drawings.

1 is a cross-sectional view of a diffusion plate according to a preferred embodiment of the present invention, Figure 2 is a view showing a path of light passing through the diffusion plate according to a preferred embodiment of the present invention, Figure 3 is another preferred embodiment of the present invention It is sectional drawing of the diffuser plate by an example. In the drawings, the same reference numerals are used for the same components for convenience, but they do not mean the same composition and shape.

In the diffusion plate 10 of the present invention, in the diffusion plate formed on the light source unit including a plurality of lamps 30, the region 20 including two or more different patterns on one surface or both surfaces is periodically formed repeatedly. The period b of the region 20 including the different patterns may satisfy the relationship between the distance a between the centers of the lamps 30 adjacent to each other and Equation 1 below.

<Formula 1>

Where a is the distance between adjacent lamp centers and b is the repetition period of the region comprising different patterns.

Here, a, a distance between the centers of the adjacent lamps 30 may be 2 cm or more.

In addition, the region 20 including different patterns may include the first pattern 21 and the second pattern 22, and the first pattern 21 may be 1 / 3b to 2 / 3b.

In this way, the pattern is designed to have the effect of minimizing the light reflected back down while reducing the defect rate and improving the uniformity of the luminance, while reducing the defective rate, unlike the case where the pattern cycle is short and must be accurately processed during machining. have. At this time, if a is 2 cm or less, the spacing between the lamps 30 is dense so that concealability can be ensured even by a patternless diffusion plate or a diffusion plate including a pattern not satisfying Equation 1 above.

In addition, if b is smaller than 1 / 6a, the loss of luminance is greater than when one specific pattern is uniformly placed on the front surface. If b is larger than 2 / 3a, when the period of the pattern and the period of the lamp become similar, The luminance is greatly increased, otherwise, the luminance is greatly darkened to show a phenomenon like Moire.

In order to solve the problem of the diffusion plate having a prism pattern for increasing the front luminance, as shown in FIG. 6, an upper portion is placed near the upper portion of the portion located between the lamp and the lamp without inserting the pattern near the upper portion of the light source. In the case where the prism pattern is inserted into the beam, as shown in the light path shown in FIG. 7, the design may be optimized to send the light to the front when the light entering the diagonal line is directed to the front. However, the area of the pattern portion should be designed to the optimum value, and even if a small amount of defect occurs, it may appear as a stain on the front surface, which may be a defect of the entire backlight unit. In addition, since the position of the lamp and the position of the pattern should be precisely specified, the pattern must be made precisely at the desired position, so that the machining has a high failure rate. As an example, FIG. 8 illustrates a form in which the positions of the lamps and the patterns are set incorrectly due to the position of the machining, and FIG. 9 illustrates the path of light accordingly. Compared with FIG. 7, light traveling toward the front side is reduced, and it can be seen that light that goes out obliquely or is refracted by the prism pattern is increased downward.

In contrast, the present invention includes the first pattern 21 and the second pattern 22 at the same cycle as described above, so that fixing to the position is unnecessary, thereby increasing luminance uniformity while increasing the efficiency of light, and thereby increasing the luminance uniformity. It can increase efficiency.

The region 20 comprising different patterns of the present invention comprises a polyhedron shape having a polygonal cross section; Hemispherical shape that is semi-circular or semi-elliptic; The cross section may include two or more patterns selected from columnar patterns that are polygonal, semi-circular or semi-elliptic.

Or a polyhedral or columnar pattern having a polygonal cross section, wherein at least one of the vertex angle, the slope, the pitch, and the height includes different patterns, or one or more of the vertex angle, the slope, the pitch, and the height are sequentially It may include a decreasing pattern and a sequentially increasing pattern. For example, as shown in FIG. 3, a right triangle pattern and a right triangle pattern that are symmetrical with the triangle pattern may be formed to have a pattern period b.

Or a semi-spherical or columnar pattern having a semi-circular or semi-elliptical cross section, wherein at least one of the pitch or height includes a different pattern, or a pattern in which one or more of the pitch or height decreases sequentially and increases sequentially. It may be to include.

Polyhedral shape whose cross section is polygonal; Hemispherical shape whose cross section is semi-circular or semi-elliptic; It may include any one pattern selected from among patterns having a polygonal, semi-circular or semi-elliptic columnar shape, and an area where the pattern is not formed. The region where the pattern is not formed may be selected from a patternless layer, a reflective layer, a transflective reflective layer, a black matrix layer, and a foamed air layer.

In addition to these, regions containing patterns different from each other may include a polyhedron shape having a polygonal cross section; Hemispherical shape whose cross section is semi-circular or semi-elliptic; The cross-section may include any one pattern selected from among patterns having a polygonal shape, a semi-circle shape or a semi-ellipse shape, and a fine irregular pattern.

Such an optical member of the present invention may be manufactured by co-extrusion. That is, the molten base resin constituting the base layer 10 and the structural layer 20 may be formed by co-extrusion while passing through the pattern roller. The temperature during extrusion varies depending on the base resin, but is preferably extruded at 200 to 300 ° C. In this case, the base resin may be polystyrene (PS), polycarbonate (PC), polymethylmethacrylate (PMMA), polypropylene (PP), and cyclic olefin copolymer (Cyclic Olefin Copolymer, COC) may be one or more selected. The diffusion plate of the present invention prepared as described above may have a thickness of 0.5 ~ 1.8mm.

The substrate layer 10 of the optical member of the present invention may contain light diffusing particles (not shown), it is preferable to use a particle diameter of 1 ~ 50㎛, 10 ~ to 100 parts by weight of the binder resin It is preferable to include 500 parts by weight. When the light diffusing particles having such a particle diameter are included in the above content, an appropriate light diffusing effect may be provided while preventing whitening and separation of the particles.

As the light diffusing particles, a plurality of organic particles or inorganic particles may be used. Representative organic particles include methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, methylol acrylamide, glycidyl methacrylate, and ethyl acryl. Acrylic particles of latex, isobutyl acrylate, normal butyl acrylate, 2-ethylhexyl acrylate homopolymer or copolymer; Olefinic particles such as polyethylene, polystyrene and polypropylene; Acrylic and olefin copolymer particles; And multi-layered multicomponent particles, siloxane polymer particles, tetrafluoroethylene particles, etc. formed by forming particles of a homopolymer and then covering the layers with other types of monomers. Examples of the inorganic particles include silicon oxide and aluminum oxide. , Titanium oxide, zirconium oxide, magnesium fluoride and the like. It will be apparent to those skilled in the art that the organic and inorganic particles are merely exemplary, and are not limited to the particles of the organic or inorganic materials listed above, and may be replaced by other known materials as long as the object of the present invention can be achieved. In addition, such a material change is also within the scope of the technical idea of the present invention.

As such, the present invention can provide a backlight unit assembly including a light source unit including a plurality of lamps 30 and the diffusion plate 10 of the present invention described above. The light source unit may have a distance of 2 cm or more, which is a distance between adjacent lamp centers.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

&Lt; Example 1 >

 Using polystyrene (PS) as the main material, the distance between the patterned portion and the non-patterned portion is equivalent to the prism pattern of an isosceles triangle with a base of 70 µm and a height of 40 µm. A diffuser plate with b = 2 / 7a and a total thickness of 1.2 mm was produced for the distance a between adjacent lamp centers.

<Example 2>

The diffusion plate designed in Example 1 was manufactured to move to the right by 1 / 7a in the horizontal direction with respect to the lamp compared to Example 1.

<Example 3>

The diffusion plate designed in Example 1 was manufactured to move to the right by 1 / 14a in the horizontal direction with respect to the lamp compared to Example 1.

<Example 4>

 Using a polystyrene (PS) as a main material, a right triangle pattern having a base of 50 µm and a pattern symmetrical to the right triangle pattern have the same area, and a period a between the two patterns has a distance b between adjacent lamp centers. The diffuser plate was manufactured so that b = 2 / 3a and the total thickness might be 1.2 mm.

 <Example 5>

The diffusion plate designed in Example 4 was manufactured to move to the right by 1 / 3a in the horizontal direction with respect to the lamp compared to Example 4.

<Example 6>

The diffusion plate designed in Example 4 was manufactured to move to the right by 1 / 6a in the horizontal direction with respect to the lamp compared to Example 4.

&Lt; Comparative Example 1 &

A polystyrene (PS) diffusion plate (1.2 mm in total thickness) containing no diffusing agent and no pattern was prepared.

Comparative Example 2

Polystyrene (PS) was used as a main material, and a total thickness of 1.2 mm including a silicon copolymer organic diffuser (Silicone Bead) having a transmittance of 55% and a haze of 99% was prepared.

&Lt; Comparative Example 3 &

Polystyrene (PS) was used as a main material, and a total thickness of 1.2 mm was prepared by forming an isosceles triangular prism pattern having a base of 70 μm and a height of 40 μm.

&Lt; Comparative Example 4 &

The entire pattern period b, with polystyrene (PS) as the main material and the distance occupied by the prism pattern of an isosceles triangle with a base of 70 µm and a height of 40 µm as 1 / 2a, and the distance occupied by the non-patterned surface as 1 / 2a. Was set as a, and the center of the non-patterned surface was positioned at the center of the lamp, and a diffuser plate having a total thickness of 1.2 mm was manufactured.

&Lt; Comparative Example 5 &

Using polystyrene (PS) as the main material, the prism pattern of an isosceles triangle with a base of 70 µm and a height of 40 µm is 1 / 2a, and the non-pattern surface is 1 / 2a, so that the entire pattern period b is equal to a. The center of the lamp is designed so that the center of the non-patterned surface is 30% off, and a total thickness of 1.2mm is manufactured.

The diffuser plate produced in the above Examples and Comparative Examples was laminated on a light source layer having a distance of 2.3 cm between adjacent lamp centers of the 42 ″ backlight unit assembly, and used with a luminance meter (model name: BM-7, TOPCON, Japan). The difference between the average value Laver., The maximum value Lmax., And the minimum value Lmin. Of the measured brightness was calculated.

 Since the luminance can be changed every measurement evaluation, the relative values are shown in Table 1 below with the luminance average value Laver. Of Comparative Example 2 as 100.

division Laver. Lmax.-Lmin. Example 1 114 2.8 Example 2 115 2.9 Example 3 114 2.8 Example 4 111 3.1 Example 5 112 3.3 Example 6 112 3.3 Comparative Example 1 104 17.4 Comparative Example 2 100 9.8 Comparative Example 3 107 4.1 Comparative Example 4 118 3.5 Comparative Example 5 105 8.4

 As can be seen from the above results, the embodiments of the present invention in which the relationship between the distance a between the pattern period b and the adjacent lamp center satisfies Equation 1 based on Comparative Example 2 have a pattern period with an increase in luminance. It can be seen that a uniform luminance deviation can be secured regardless of.

On the contrary, in the case of Comparative Example 1, the luminance average is increased when no diffusing agent is added, but the luminance deviation is increased because it does not cover the light of the lamp sufficiently, and as in Comparative Example 3, a uniform prism is formed on the upper surface of the diffusion plate. When the pattern is inserted, an increase in luminance and an even luminance deviation can be obtained, but are lower than those of the embodiments of the present invention. However, as in Comparative Example 5, in this case, if the distance a between the optimized pattern period b and the adjacent lamp centers is not exactly matched to the design value, it has a low luminance increase and a bad luminance deviation. Therefore, a high failure rate may appear when machining the diffuser plate.

1 is a cross-sectional view of the diffusion plate according to an embodiment of the present invention,

2 is a view showing a path of light passing through the diffusion plate of a preferred embodiment of the present invention,

3 is a cross-sectional view of a diffuser plate of another preferred embodiment of the present invention;

4 is a view showing a cross section of a diffusion plate in which a prism pattern is inserted as a conventional diffusion plate;

5 is a view showing a path of light passing through the diffusion plate of FIG. 4,

6 is a cross-sectional view of a diffuser plate having no pattern inserted near the upper portion of a light source as a conventional diffuser plate;

7 is a view illustrating a path of light passing through the diffusion plate of FIG. 6;

8 is a view showing a cross section of the conventional diffusion plate when the diffusion plate of FIG.

9 is a view illustrating a path of light passing through the diffusion plate of FIG. 8.

* Explanation of the symbols of the main parts of the drawings

10: diffuser 20: region containing different patterns from each other

21: first pattern 22: second pattern

30: lamp

Claims (12)

In the diffusion plate formed on the light source unit including a plurality of lamps, A diffuser plate in which regions including two or more different patterns on one surface or both surfaces are periodically repeatedly formed, and a period of the region including different patterns satisfies the relationship between the distance between adjacent lamp centers and the following formula (1). <Formula 1>

Where a is the distance between adjacent lamp centers and b is the repetition period of the region comprising different patterns. The method of claim 1, A diffuser plate, characterized in that the distance a between the adjacent lamp centers is 2 cm or more. The method of claim 1, wherein the region comprising different patterns from each other A diffusion plate comprising a first pattern and a second pattern, wherein the length of the region where the first pattern is formed is 1 / 3b to 2 / 3b. The method of claim 1, wherein the region comprising different patterns from each other Polyhedral shape whose cross section is polygonal; Hemispherical shape that is semi-circular or semi-elliptic; A diffuser plate, characterized in that it comprises at least two patterns selected from columnar patterns having a polygonal, semi-circular or semi-oval cross section. The method of claim 1, wherein the region comprising different patterns from each other The pattern is any one selected from among polyhedral or columnar patterns with polygonal cross-sections, wherein at least one of the vertex angle, the slope, the pitch, and the height includes different patterns, or one or more of the corner angles, the slope, the pitch, and the height are sequentially reduced. Diffusion plate, characterized in that it comprises a pattern to increase in sequence with the pattern. The method of claim 1, wherein the region comprising different patterns from each other A hemispherical or columnar pattern with a semi-circular or semi-elliptical cross section, wherein one or more of the pitches or heights include different patterns, or one or more of the pitches or heights decreases sequentially and the pattern increases sequentially. Diffusion plate, characterized in that it comprises. The method of claim 1, wherein the region comprising different patterns from each other Polyhedral shape whose cross section is polygonal; Hemispherical shape whose cross section is semi-circular or semi-elliptic; A diffuser plate, characterized in that it comprises any one pattern selected from among patterns having a polygonal, semi-circular or semi-elliptical columnar shape, and an area where the pattern is not formed. The method of claim 7, wherein the region where the pattern is not formed is A diffuser plate, characterized in that it is selected from a patternless layer, a reflective layer, a transflective reflective layer, a black matrix layer and a foamed air layer. The method of claim 1, wherein the region comprising different patterns from each other Polyhedral shape whose cross section is polygonal; Hemispherical shape whose cross section is semi-circular or semi-elliptic; A diffuser plate, characterized in that it comprises any one pattern selected from among patterns having a polygonal, semi-circular or semi-elliptical columnar shape, and a fine concave pattern. The method of claim 1, One selected from polystyrene (PS), polycarbonate (PC), polymethylmethacrylate (PMMA), polypropylene (PP), and cyclic olefin copolymer (Cyclic Olefin Copolymer, COC) A diffusion plate comprising the above. The method of claim 1, Diffusion plate, characterized in that it further comprises diffusion particles. A light source unit including a plurality of lamps; And The backlight unit assembly formed on the light source unit and including the diffusion plate of any one of claims 1 to 11.

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