KR101137622B1 - Patterned Diffuser Plate and Backlight Unit Assembly Comprising the Same - Google Patents

Abstract

The present invention relates to a pattern diffuser plate and a backlight unit assembly including the same, including a base layer and a structure layer having a pattern structure formed on one surface of the base layer to improve luminance and luminance uniformity, wherein the structure layer includes a plurality of At least two pattern groups from among the first pattern group, the second pattern group, and the third pattern group each including a pattern group having parallel patterns are formed to cross each other in at least one region. And it relates to a backlight unit assembly comprising the same.

Description

Pattern Diffuser Plate and Backlight Unit Assembly Comprising the Same}

The present invention relates to a pattern diffusion plate used in a liquid crystal display and a backlight unit assembly including the same.

In the liquid crystal display used as an optical display element, a backlight unit (BLU) as a light source device is used as an important component for determining the characteristics of the liquid crystal display in an indirect light emission method in which an image is controlled by controlling the transmittance of an external light source.

The backlight unit uses light sources such as a Cold Cathode Fluorescent Lamp (CCFL) and an External Electrode Fluorescent Lamp (EEFL) to sequentially light guide plates, diffusers, diffusion sheets, and prisms. Pass the sheet or the like to reach the liquid crystal panel. Here, the light guide plate is mounted on the edge type backlight unit, and transmits the light emitted from the light source to be distributed on the front surface of the flat liquid crystal panel, and a diffusion member such as a diffusion plate or a diffusion sheet has uniform light intensity across the entire screen. And at the same time, it functions to conceal a device such as a light source mounted to the lower part of the diffusion member from being seen from the front. On the other hand, the prism sheet has a light path control function for converging light rays from various directions passing through the diffusion member into a range of viewing angle θ suitable for the viewer to recognize the image. In addition, the lower portion of the light guide plate or the diffusion plate is provided with a reflective sheet for increasing the efficiency of use of the light source by being reflected back to the light that is not delivered to the liquid crystal panel and out of the path.

In addition to the above-described functions, the diffusion plate also serves as a support to prevent film-like optical components such as a diffusion sheet and a prism sheet placed on the diffusion plate from falling in the direction of the light source.

Conventional diffuser plate contains organic diffuser made of PMMA, Si, or inorganic diffuser such as TiO ₂ , Al ₂ O ₃ inside the diffuser plate. Focused on functionality

However, in recent years, through the continuous development of technology, the amount of diffusing agent is reduced to improve the transmittance. Instead, a prismatic pattern or a lenticular pattern formed in the same direction as the direction of the line light source is formed on the upper surface of the diffusion plate. Pattern diffusers have been developed.

Such a pattern diffuser serves to increase luminance by adjusting a path of light coming from a line light source in a front direction. In particular, the prism pattern diffusion plate has a triangular array structure having an inclined surface of 45 °, thereby showing a better effect on improving luminance. Through the reduction of the amount of the diffusion agent and the application of the pattern, the effect of improving the brightness of the diffusion plate and increasing the brightness uniformity can be simultaneously obtained.

Recently, various flat panel display devices that reduce weight and volume, which are disadvantages of Cold Cathode Fluorescent Lamps (CCFLs) or External Electrode Fluorescent Lamps (EEFLs), have emerged. Such flat panel displays include field emission displays (FEDs), plasma display panels (PDPs), and light emitting devices (LEDs). In particular, the use of LEDs is rapidly increasing, and LEDs can improve color reproducibility without using toxic mercury (Ag) among the aforementioned display devices, and maximize energy efficiency by blinking in a short time when necessary. In addition, it has the advantage of excellent color reproducibility.

In addition, in case of direct type BLU using LED light source, when the image is realized, the bright part turns on the LED light source, the dark part weakens the brightness of the LED light source, and the black part turns off the image light source (Local Dimming). The functionality can be implemented. The image part control function firstly turns off the light source of unnecessary parts to reduce the power consumption by minimizing the driving voltage when the LCD-TV is driven. Secondly, the contrast ratio between bright and dark areas is high, resulting in clearer and more detailed image quality. There is an advantage to enable the implementation of.

On the other hand, the direct type BLU that distributes LEDs on the bottom front of the BLU can realize excellent image quality, but it is expensive because a large number of LEDs are used, and high power consumption is required as many LEDs are used. There is a problem in that the amount of heat generation is reduced, the durability of the product. Therefore, the application range of the edge type BLU using the LED light source is expanding.

Edge type BLU is manufactured by using a light guide plate to distribute light to the front surface by attaching a light source to one or more sides of the BLU. Such an edge type BLU can reduce the number of LEDs and reduce the cost and heat generation as compared to the direct type BLU, but has a problem in that the brightness is low and the image part control function cannot be implemented (FIG. 2).

As described above, due to the emergence of BLU using a point light source such as an LED, a change is required in the light guide plate and the diffusion plate.

However, in the case of the edge type BLU in which the LED is mounted on the edge of the BLU, since the LED is listed and mounted in the form of a line light source such as a conventional CCFL or EEFL, the point type BLU plays the same role as the line light source even though it is a point light source. It can be applied without significant difference from the conventional light guide plate used in the present invention.

On the other hand, in the direct type BLU to which the LED light source is applied, the characteristic of point light source is exposed as it is, and the change of the diffuser plate is needed. Conventional pre-light sources are mainly composed of a plurality of lamps arranged to minimize the difference between the bright portion starting from the lamp and the darker portion between the lamp and the lamp (Fig. 1). However, in the BLU to which the LED light source as the point light source is applied, the luminance may be increased and the uniformity of the luminance may be increased in one specific direction (for example, in the same direction as the pattern of the pattern diffuser) even if the existing high performance pattern diffuser is applied. Otherwise, the lamp is exposed as it is in the vertical direction, so that the light and dark portions are visible (FIG. 3).

Therefore, the BLU using the LED light source, which is a point light source, cannot use the existing high-performance pattern diffuser, and a diffuser plate that focuses only on diffusion so that the point light source becomes a surface light source by applying a large amount of diffuser to the general diffuser plate. Although it is possible to improve the luminance uniformity, there is a problem in that the high brightness which is an advantage of the LED light source is not achieved.

An object of the present invention is to provide a pattern diffusion plate in which a pattern structure capable of improving luminance and / or luminance uniformity is formed.

In addition, the present invention is to provide a backlight unit assembly using a pattern diffusion plate in which a pattern structure having high luminance and / or uniform luminance characteristics is formed.

Accordingly, the present invention provides a pattern diffuser plate disposed above the light source unit as a first preferred embodiment, comprising: a base layer; And a structure layer formed on one surface of the substrate layer and including a first pattern group, a second pattern group, and a third pattern group each including a pattern group in which a plurality of patterns are arranged in parallel. At least two pattern groups among the group, the second pattern group, and the third pattern group are provided in at least one region so as to cross each other.

Cross angles between the pattern groups that cross each other according to the embodiment may be + 50 ° to + 70 °, respectively.

The pattern according to the embodiment may have a pitch of 30 to 450 μm and a height of 10 to 300 μm.

The cross-sectional shape of the pattern according to the embodiment may be selected from the group consisting of triangular, semi-circular, semi-elliptic and trapezoidal.

The pattern according to the embodiment may be a short circuit.

The plurality of patterns according to the embodiment may be arranged in parallel with a distance of 900㎛ or less.

The substrate layer according to the embodiment is polystyrene (PS), polycarbonate (PC), polymethylmethacrylate (PMMA), polypropylene (PP) and cyclic olefin copolymer (Cyclic Olefin) A flat plate comprising at least one polymer resin selected from the group consisting of Copolymer, COC); Or a polymer resin film selected from the group consisting of polyethylene terephthalate film, polycarbonate film, polypropylene film, polyethylene film, polystyrene film and polyepoxy film.

The substrate layer according to the embodiment may further include diffusion particles.

The present invention provides a second preferred embodiment as a light source; And a base layer; And a structure layer formed on one surface of the substrate layer and including a first pattern group, a second pattern group, and a third pattern group each including a pattern group in which a plurality of patterns are arranged in parallel. At least two pattern groups among the group, the second pattern group, and the third pattern group are provided to have a backlight unit assembly including a pattern diffuser plate, which is formed to cross each other in at least one region.

The first pattern group according to the embodiment may be arranged in a vertical or horizontal direction with respect to the array direction of the light source.

The light source according to the embodiment may be a point light source.

1 is a BLU to which a line light source according to the prior art is applied.
2 is an edge type BLU to which an LED light source according to the prior art is applied.
3 is a direct type BLU to which the LED light source according to the prior art is applied.
FIG. 4 illustrates a pattern diffuser plate according to the present invention, in which a first pattern group, a second pattern group, and a third pattern group including a plurality of patterns having a prism shape are formed.
FIG. 5 is a pattern diffuser plate according to the present invention, wherein a pattern diffuser plate having a first pattern group, a second pattern group, and a third pattern group including a plurality of patterns having a prism shape is spaced apart from each other by a predetermined distance. The pattern diffuser plate is shown.
FIG. 6 illustrates a pattern diffusion plate in which a first pattern group, a second pattern group, and a third pattern group including a plurality of patterns having a lenticular shape are formed as a pattern diffusion plate according to the present invention.
7 is a pattern diffusion plate according to the present invention, wherein a pattern diffusion plate in which a first pattern group, a second pattern group, and a third pattern group including a plurality of patterns having a lenticular shape is formed, having a predetermined distance between the patterns The pattern diffuser plate is shown.
FIG. 8 illustrates a pattern diffusion plate in which a first pattern group, a second pattern group, and a third pattern group including a plurality of patterns having a frustum shape are formed as a pattern diffusion plate according to the present invention.
FIG. 9 is a pattern diffusion plate according to the present invention, wherein a pattern diffusion plate in which a first pattern group, a second pattern group, and a third pattern group including a plurality of patterns having a frustum shape is formed, has a constant pattern between the patterns The pattern diffusion plate is shown at a distance.
10 is a pattern diffusion plate according to the present invention, wherein a pattern diffusion plate including a first pattern group, a second pattern group, and a third pattern group including a plurality of patterns having a prism shape is spaced apart from each other by a predetermined distance. The pattern diffuser with the pattern shorted is shown.
11 is a photograph of luminance measurement of a patternless optical sheet.
12 is a photograph of luminance measurement of an optical sheet on which a pattern in one direction is formed.
FIG. 13 is a photograph of luminance measurement of a pattern diffuser plate having a first pattern group, a second pattern group, and a third pattern group according to the present invention. FIG.

Hereinafter, the present invention will be described in more detail.

The present invention is based on the fact that the pattern structure can be used to improve the brightness and / or brightness uniformity of the diffusion plate, and has the same configuration, but the path of light emitted from the light source by three pattern structures intersected at constant intersection angles. It relates to a pattern diffusion plate and a backlight unit assembly using the same, characterized in that to improve the brightness and / or brightness uniformity by adjusting the.

As a preferred embodiment, the present invention provides a patterned diffusion plate disposed above the light source unit, the substrate layer; And a structure layer formed on one surface of the substrate layer and including a first pattern group, a second pattern group, and a third pattern group each including a pattern group in which a plurality of patterns are arranged in parallel. At least two pattern groups among the group, the second pattern group, and the third pattern group provide a pattern diffusion plate, which is formed to cross each other in at least one region.

In the pattern diffusion plate according to the present invention, at least two pattern groups are formed to cross each other in at least one region among patterns arranged at various angles, so that the light is uniformly diffused by directing the light path in the overall direction. In this way, the luminance uniformity is improved.

In the present invention, the first pattern group is arranged vertically or horizontally with respect to the longitudinal direction of the light source included in the light source unit. For example, when the light source is a direct type LED point light source, a plurality of patterns included in the first pattern group are arranged vertically or horizontally with respect to the longitudinal direction in which the direct type LED point light sources are arranged.

The first pattern group, the second pattern group, and the third pattern group arranged as described above intersect each other, and the crossing angle between the intersecting pattern groups is preferably + 50 ° to + 70 ° in consideration of luminance uniformity. .

For example, the second pattern group may cross at a crossing angle of + 50 ° to + 70 ° with respect to the first pattern group in consideration of the luminance uniformity, and the third pattern group may also cross the first pattern group in consideration of the luminance uniformity. It is preferable to intersect at an intersection angle of + 50 ° to + 70 ° with respect to each other, and in order to further improve luminance uniformity, the intersection angles of the second pattern group and the third pattern group with respect to the first pattern group are respectively + More preferably, it is 60 degrees.

The plurality of patterns included in the first pattern group, the second pattern group, and the third pattern group included in the structural layer of the pattern diffusion plate according to the present invention are designed in consideration of the luminance improvement and the luminance uniformity of the pattern diffusion plate.

That is, the pattern has a pitch of 30 to 450 μm and a height of 10 to 300 μm in consideration of luminance improvement, and the cross-sectional shape of the pattern is also triangular, semicircular, semi-elliptic and It is preferably selected from the group consisting of trapezoidal shapes. Here, if the cross-sectional shape of the pattern is triangular, the pattern is prism-shaped, and if the cross-sectional shape of the pattern is semi-circular or semi-elliptical, the pattern is lenticular. If the cross-sectional shape of the pattern is trapezoidal, the pattern is frustum.

On the other hand, the plurality of patterns may be a variety of forms, such as linear, wave (wave) type, it is preferable to be arranged in a short circuit in consideration of the uniformity of the brightness.

In addition, the plurality of patterns are arranged in parallel in parallel and in a form arranged in parallel with a distance of 900㎛ or less in order to optimize the brightness enhancement. If the distance between two adjacent patterns exceeds 900 μm, the role of the pattern for improving the brightness is not optimized and it is difficult to expect the effect of improving the brightness.

In particular, when the cross-sectional shape of the pattern is trapezoidal and the pattern is frustum-shaped, the distance between two adjacent patterns is preferably 50% or more of the pattern pitch for the improvement of luminance. For example, when the pattern pitch is 200 mu m or more, the distance between two adjacent patterns is preferably 100 mu m or more.

Due to the arrangement of the pattern, in the absence of the pattern, the light from the light source is directly transmitted through the substrate layer to the front surface, and in the presence of the pattern, the light incident from the light source into the square is patterned. By adjusting the path of the light toward the front through the through, it is possible to achieve an increase in overall luminance uniformity. In addition, whether or not the pattern is short and the distance between the pattern is adjusted as necessary by the arrangement method of the light source located below the pattern diffusion plate containing the pattern, the distance between the light source and the optical sheet.

On the other hand, the pattern diffusion plate according to the present invention may further include diffusion particles in the substrate layer, 10% by weight or less in consideration of improving the brightness and brightness uniformity, 5% by weight or less in consideration of the optimization of brightness and brightness uniformity It is preferable to include.

As the diffusion particles, a plurality of organic particles or inorganic particles may be used. Typical organic particles used are methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, ethyl acrylate. , Isobutyl acrylate, normal butyl acrylate, 2-ethylhexyl acrylate homopolymer or copolymer of acryl particles and olefin crab particles such as polyethylene, polystyrene and polypropylene, acryl and olefin copolymer particles and homopolymers After the particles are formed, multi-layered multi-component particles made by covering the layers with other monomers are used. As inorganic particles, silicon oxide, aluminum oxide, titanium oxide, zirconium oxide, magnesium fluoride and the like are used. 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 main object of the present invention can be achieved. Obviously, such material change is also within the scope of the technical idea of the present invention.

In the present invention, the base layer and the structural layer of the pattern diffusion plate on which the base layer and the structural layer are formed may be coextruded.

That is, the molten base resin constituting the base layer may be formed by co-extrusion while passing through the pattern roller. The temperature at the time of extrusion varies depending on the base resin, but is preferably extruded at 200 to 300 ° C. At this time, the base resin of the base layer is polystyrene (PS), polycarbonate (PC), polymethylmethacrylate (PMMA), polypropylene (PP) and cyclic olefin copolymer (Cyclic Olefin) It is preferable to include at least one selected from Copolymer, COC).

In addition, after the substrate layer of the pattern diffusion layer is extruded, the structural layer may be formed by molding with a thermosetting resin or an ultraviolet curable resin.

In this case, a polymer resin flat plate or film may be used as the base layer. Polymer resin plates include polystyrene (PS), polycarbonate (PC), polymethylmethacrylate (PMMA), polypropylene (PP), and cyclic olefin copolymer (CClic Olefin Copolymer, COC) Including at least one selected from among, and the polymer resin film may be used polyethylene terephthalate film, polycarbonate film, polypropylene film, polyethylene film, polystyrene film or polyepoxy film, etc., mainly polyethylene terephthalate film and poly Carbonate film is used. The base layer may have a thickness of 10 to 5000 μm to be advantageous in mechanical strength, thermal stability, and flexibility, and to prevent loss of transmitted light, and more preferably, 15 to 400 μm and 500 to 1500 μm, depending on the application. And 2000 to 3500 µm. In other words, with the recent development of ultra-thin LCD TVs with a total thickness of only 9mm, products of both light guide and diffusion, which are not applicable to existing diffusion plates and light guide plates, are used. A description is necessary. When a conventional general diffusion plate is used, a substrate having a thickness of about 500 to 1500 µm is used, and when a thickness that has a thickness of about 2000 to 3500 µm is used when a characteristic that also serves as a light guide plate is to be secured.

Resin which forms a structural layer on the said base material layer uses thermosetting resin or ultraviolet curable resin as transparent resin. For example, unsaturated fatty acid esters, aromatic vinyl compounds, unsaturated fatty acids and derivatives thereof, unsaturated dibasic acids and derivatives thereof, vinylcyanide compounds such as methacrylonitrile and the like can be used.

By applying the pattern diffusion plate as described above to the backlight unit assembly, it is possible to provide a backlight unit assembly having high brightness characteristics and excellent brightness uniformity.

In particular, the pattern diffusion plate according to the present invention can improve the uniformity of brightness when applying to a direct type backlight unit assembly using a point light source LED as a light source and at the same time can implement a high brightness which is an advantage of the LED light source. .

In addition, the pattern diffusion plate according to the present invention can be applied to the optical member using a variety of light sources, such as CCFL, EEFL, as well as point light source such as the LED can improve the brightness uniformity and brightness.

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.

≪ Example 1 >

Using a polystyrene (PS) as a main material, a number of patterns are arranged in parallel with a base layer having a thickness of 1 mm and an isosceles triangular prism pattern having a thickness of 200 µm and a height of 100 µm at the base. The first pattern group including the pattern group, and the structural layer including the second pattern group and the third pattern group having an angle of + 60 ° with respect to the first pattern group, respectively, was coextruded. On the other hand, the distance between the parallel patterns made in the same direction was adjusted as shown in Table 1.

Pattern shape Pattern Pitch (μm) Pattern height (μm) Distance between patterns (㎛) Example 1-1 prism 200 100 0 Examples 1-2 prism 200 100 100 Example 1-3 prism 200 100 200

At this time, the pattern diffusion plate according to the embodiment 1-1 shows the shape as shown in FIG. 4, and the pattern diffusion plate according to the embodiment 1-2 and the embodiment 1-3 shows the shape as shown in FIG. 5.

<Example 2>

A polystyrene (PS) as a main material, the first layer including a base material layer having a thickness of 1mm and a pattern group in which a plurality of patterns having a lenticular pattern having a base shape of 200 μm and a radius of 100 μm as a basic shape are arranged in parallel The structural layer including the pattern group, the second pattern group and the third pattern group, which respectively make + 60 ° with respect to the first pattern group, was coextruded. On the other hand, the distance between the parallel patterns made in the same direction was adjusted as shown in Table 2.

Pattern shape Pattern Pitch (μm) Pattern height (μm) Distance between patterns (㎛) Example 2-1 Lenticular 200 100 0 Example 2-2 Lenticular 200 100 100 Example 2-3 Lenticular 200 100 200

At this time, the pattern diffusion plate according to the embodiment 2-1 shows the shape as shown in FIG. 6, and the pattern diffusion plate according to the embodiment 2-2 and the embodiment 2-3 shows the shape as shown in FIG. 7.

<Example 3>

A polystyrene (PS) as a main material, a first group comprising a pattern group in which a plurality of patterns having a basic shape based on a base layer having a thickness of 1 mm and a frustum pattern having a base length of 200 μm and a height of 100 μm are arranged in parallel The structural layer including the pattern group, the second pattern group and the third pattern group, which respectively make + 60 ° with respect to the first pattern group, was coextruded. On the other hand, the distance between the parallel patterns made in the same direction was adjusted as shown in Table 3.

Pattern shape Pattern Pitch (μm) Pattern height (μm) Distance between patterns (㎛) Example 3-1 Frustum pattern 200 100 0 Example 3-2 Frustum pattern 200 100 100 Example 3-3 Frustum pattern 200 100 200

At this time, the pattern diffusion plate according to the embodiment 3-1 shows the shape as shown in FIG. 8, and the pattern diffusion plate according to the embodiments 3-2 and 3-3 shows the shape as shown in FIG. 9.

<Example 4>

As shown in Table 4, polystyrene (PS) is used as a main material, and a base layer having a thickness of 1 mm and an isosceles triangular prism pattern having a base thickness of 200 μm and a height of 100 μm are used as basic materials. Co-extrusion of the first pattern group including the pattern group arranged in parallel, the structural layer including the second pattern group and the third pattern group having an angle of +60 ° with respect to the first pattern group, respectively It was. At this time, the distance between the patterns is left to empty space 200㎛, one pattern is formed by connecting the hexagon as a pattern when the pattern is connected from the top 2a when the pattern is connected twice as a. Here, the patterns are connected by 600 µm and the patterns are short-circuited by 1,200 µm.

Pattern shape Pattern Pitch (μm) Pattern height (μm) Distance between patterns (㎛) Example 4 Paragraph prism 200 100 200

In this case, the pattern diffusion plate according to the fourth embodiment has a form as shown in FIG. 10.

Comparative Example 1

It was prepared by extruding an optical sheet having a thickness of 1.1 mm from a polystyrene (PS) material containing no diffusing agent and no pattern.

Comparative Example 2

Structure containing polystyrene (PS) as a main material and pattern groups formed in only one direction based on a prismatic pattern of an isosceles triangle having a thickness of 1 mm and an isosceles triangle having a thickness of 200 μm and a height of 100 μm. The layer was produced by coextrusion. On the other hand, the distance between the parallel patterns made in the same direction was adjusted as shown in Table 5.

Pattern shape Pattern Pitch (μm) Pattern height (μm) Distance between patterns (㎛) Comparative Example 2-1 Single prism 200 100 0 Comparative Example 2-2 Single prism 200 100 100 Comparative Example 2-3 Single prism 200 100 200

&Lt; Comparative Example 3 &

Using a polystyrene (PS) as a main material, a number of patterns are arranged in parallel with a base layer having a thickness of 1 mm and an isosceles triangular prism pattern having a thickness of 200 µm and a height of 100 µm at the base. The first pattern group including the pattern group, and the structural layer including the second pattern group and the third pattern group having an angle of + 20 ° with respect to the first pattern group, respectively, was produced by co-extrusion. On the other hand, the distance between the parallel patterns made in the same direction was adjusted to 200 mu m.

The luminance was measured as follows for the pattern diffuser plate and the optical sheet obtained through the examples and the comparative examples.

(1) brightness

The pattern diffuser plate and the optical sheet prepared in Examples and Comparative Examples were laminated on a 42 "backlight unit assembly using an LED direct light source, and the backlight unit was used using a luminance meter (model name: BM-7, TOPCON, Japan). By measuring the average value of the luminance measured at 5 points of assembly center Laver. And checking the effect of luminance increase, measure the standard deviation Lstdev. Of luminance by measuring 17 points total 10 points horizontally and 7 points vertically. The luminance uniformity was compared.

Since the luminance can be changed at every measurement evaluation, the relative values are shown in Table 6 below, with the luminance average value Laver. Of Comparative Example 1 being 100. At this time, the luminance average value luminance average value Laver. Is higher, and the standard deviation Lstdev. Lower values are advantageous as optical components of the backlight unit assembly.

Pattern shape Pattern pitch
(Μm) Pattern height
(Μm) Distance between patterns
(Μm) Luminance
Average
Laver. Luminance
Standard Deviation
Lstdev. Example 1-1 prism 200 100 0 129 5.7 Examples 1-2 prism 200 100 100 127 5.4 Example 1-3 prism 200 100 200 131 6.2 Example 2-1 Lenticular 200 100 0 128 6.3 Example 2-2 Lenticular 200 100 100 126 5.9 Example 2-3 Lenticular 200 100 200 126 6.2 Example 3-1 Frustum 200 100 0 119 9.2 Example 3-2 Frustum 200 100 100 121 7.4 Example 3-3 Frustum 200 100 200 125 6.9 Example 4 Paragraph prism 200 100 200 127 6.4 Comparative Example 1 No pattern - - - 100 18.4 Comparative Example 2-1 Single prism 200 100 0 124 10.2 Comparative Example 2-2 Single prism 200 100 100 121 10.6 Comparative Example 2-3 Single prism 200 100 200 118 9.8 Comparative Example 3 prism
(Angle + 20 °) 200 100 200 126 11.4

As a result of the evaluation of the luminance measurement, it can be seen that the pattern diffusion plate according to the embodiment of the present invention is advantageous as an optical component of the backlight unit assembly with a higher average luminance value and a lower standard deviation of luminance than the sheet of the comparative example.

That is, a pattern diffusion plate including a first pattern group, a second pattern group, and a third pattern group having a pattern structure intersecting in three different directions at an angle of + 60 ° according to an embodiment of the present invention is a comparative example. The luminance average increased by 27% and the standard deviation of luminance decreased by 67% compared to the patternless optical sheet of 1, and the luminance average increased by 6.7% compared to the optical sheet having a pattern formed only in one direction according to Comparative Example 2. The standard deviation of luminance decreased by 23%.

This is because the non-patterned optical sheet of Comparative Example 1 has a large difference between the darkest and the brightest places, and thus the luminance average is low, and the standard deviation of luminance appears large (Fig. 11). It can be seen that the pattern gathers light toward the center while reducing the luminance deviation, and thus also increases the luminance effect (FIG. 12).

On the other hand, the brightness and uniformity of the pattern diffusion plate according to the embodiment of the present invention are all similar to the results of the luminance measurement of FIG. 13, and the pattern diffusion plate according to the embodiment is +60 with respect to the first pattern group, respectively. The second pattern group and the third pattern group are formed to form an angle of °, and the hexagonal unit structure formed by the first pattern group, the second pattern group, and the third pattern group receives the light of one LED light source. It was found that the luminance is increased and the luminance uniformity is increased by being directed to the front surface while diffusing in various directions.

Also, as in the result of Comparative Example 3, when the angle between the second pattern group and the third pattern group with respect to the first pattern group decreases, the luminance standard deviation is slightly increased than the result of the embodiment, so that the single prism pattern of Comparative Example 2 It was confirmed that there was a tendency to be similar.

Therefore, the pattern diffuser plate including the first pattern group, the second pattern group, and the third pattern group, which are pattern structures intersected in three different directions, has a luminance and a luminance as compared to an optical sheet having no pattern or a pattern formed only in one direction. It was found that the uniformity was excellent.

In particular, in the case of manufacturing a direct type backlight unit assembly using an LED light source by applying the pattern diffusion plate according to the embodiment, it is possible to solve the difficulty of implementing high brightness, which is a problem of the direct type backlight unit assembly using a conventional LED light source, thereby increasing luminance and uniformity of brightness. It can be seen that it is possible to manufacture a backlight unit assembly indicating rise.

Claims (11)

In the pattern diffuser plate disposed above the light source unit,
A base layer; And a structure layer formed on one surface of the substrate layer and including a first pattern group, a second pattern group, and a third pattern group each including a pattern group in which a plurality of patterns are arranged in parallel.
At least two pattern groups of the first pattern group, the second pattern group, and the third pattern group are formed to cross each other in at least one region.
The pattern diffuser of claim 1, wherein the crossing angles between the pattern groups that cross each other are + 50 ° to + 70 °.
The pattern diffusion plate of claim 1, wherein the pattern has a pitch of 30 to 450 μm and a height of 10 to 300 μm.
The pattern diffusion plate of claim 1, wherein the cross-sectional shape of the pattern is selected from the group consisting of triangular, semi-circular, semi-elliptic, and trapezoidal.
The pattern diffusion plate according to claim 1, wherein the pattern is short-circuited.
The pattern diffusion plate of claim 1, wherein the plurality of patterns are arranged in parallel at a distance of 900 μm or less.
The method of claim 1, wherein the substrate layer is made of polystyrene (PS), polycarbonate (PC), polymethylmethacrylate (PMMA), polypropylene (PP) and cyclic olefin copolymer ( A flat plate comprising at least one polymer resin selected from the group consisting of Cyclic Olefin Copolymer, COC); Or a polymer resin film selected from the group consisting of polyethylene terephthalate film, polycarbonate film, polypropylene film, polyethylene film, polystyrene film and polyepoxy film.
The pattern diffusion plate of claim 1, wherein the substrate layer further comprises diffusion particles.
Light source; And
A base layer; And a structure layer formed on one surface of the substrate layer and including a first pattern group, a second pattern group, and a third pattern group each including a pattern group in which a plurality of patterns are arranged in parallel. And at least two pattern groups among the group, the second pattern group, and the third pattern group are formed to cross each other in at least one region.
The backlight unit assembly of claim 9, wherein the first pattern group is arranged in a vertical or horizontal direction with respect to the array direction of the light source.
10. The backlight unit assembly of claim 9, wherein the light source is a point light source.

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