KR20100004537A - Composite optical sheet and back light unit comprising the same - Google Patents

Abstract

PURPOSE: A composite optical sheet and a back light unit comprising the same is provided to control the recycle by forming a hemispherical optical structure with a certain curvature at a vertex angle. CONSTITUTION: A light diffusing layer is formed with a transparent macromolecular film. The optical structure of a prism shape having a triangle shape is formed on one side of a complex optical sheet. The optical structure of the prism shape is coated to the transparent resin. At least two hemispherical structures having a certain curvature is formed at the vertex of the prism and they have same grain in same direction. At least two hemispherical shapes are internally touched on the ridge of the prism.

Description

COMPOSITE OPTICAL SHEET AND BACK LIGHT UNIT COMPRISING THE SAME}

The present invention implements a shape of a prism lens in a hemispherical shape that is resistant to vibration and scratches, thereby minimizing brightness degradation, improving light diffusivity, and eliminating the phenomenon of sheet cleavage caused by vibration friction with a panel. A composite optical sheet for a back light unit.

In general, a display is classified into a light emitting type and a light receiving type, and the light emitting type includes a cathode ray tube, a plasma display panel, an electroluminescent device, a fluorescent display device, a light emitting diode, and the like. crystal display, LCD).

Among them, the liquid crystal display itself is a light-emitting display that does not form an image by emitting light, but forms an image only when light is incident from the outside, so that an image cannot be observed in a dark place. In order to solve this problem, a backlight unit (back light unit) is installed on the back of the liquid crystal display to irradiate light, thereby realizing an image even in a dark place.

Background Art [0002] A cold cathode fluorescent lamp (CCFL) is disposed in a backlight unit and a flat fluorescent lamp in which an upper and lower substrates on which phosphors are applied is assembled. The cold cathode fluorescent lamps are arranged in an edge light method using a light guide plastic (LGP) and a direct light method in which the cold light is disposed on a flat surface. Can be distinguished.

In the backlight unit, a fluorescent lamp (CCFL) used as a light source is one of the important components. In the conventional backlight unit using such a fluorescent lamp, as shown in FIG . 1 , the light generated by using the fluorescent lamp 1 as a light source is transmitted through the LGP 2 so that the liquid crystal device is directly under the liquid crystal display device. Project onto the surface. In addition, in order to project more light generated from the fluorescent lamp 1 to the light guide plate 2, a lamp reflector 3 is provided around the fluorescent lamp 1, and a reflecting plate at the bottom of the light guide plate 2 is provided. A reflector sheet 4 is placed to reflect light to the liquid crystal element surface. The optical sheet is arranged on the upper surface of the light guide plate 2 in the order of a diffuser sheet 5, a prism sheet 6, and a protector sheet 7. Here, the diffusion sheet 5 is used to increase the uniformity of light emitted from the light guide plate 2, and the prism sheet 6 is used to align the light at 90 ° or 180 ° to the liquid crystal element surface and project it. Use 1 or 2 sheets. In addition, the protective sheet 7 is used to enhance the protection of the prism sheet 6 and the uniformity of light.

The sheets are stacked and assembled in a mold frame 8 in a top down manner, and a metal back cover 9 is disposed at the bottom thereof, and the outer parts of all the components are disposed. The press is called a bezel (11) is wrapped. In FIG. 1 , reference numeral 10 denotes a panel of the liquid crystal display.

In the sheet configuration as described above, the most economical value is applied to a monitor or TV model, and the most economical value is that the diffusion sheet is laminated on the light guide plate, and a prism sheet having a 90 ° vertex angle is formed thereon. On top of that, a protective sheet is additionally constructed to protect the vertex peak of the prism and add diffusivity. Recently, attempts have been made to replace the prism sheet and the protective sheet with one sheet, i.e., composite sheets, in such a general sheet configuration, and the technology development for this is active. In addition, attempts have been made to compound the diffusion sheet and the prism sheet and to combine all three diffusion sheets, the prism sheet and the protective sheet into one sheet.

In order to composite the sheet, conventionally, a plurality of scratches are randomly distributed on a rectangular prism shape pattern having a vertex angle of 90 ° to composite a prism sheet and a protective sheet ( FIG. 2 ). However, the composite sheet of this type has a lower brightness than the general prism sheet without scratches, and the random spreading of the scratches results in a random spread of the scratches on the master roll. There is a problem that the processing deviation will occur, which leads to non-uniformity of the quality, thereby lowering the quality uniformity during mass production.

Another compounding method is to apply a binder resin solution with a light diffusing agent having a radius of 0.5 to 25 ㎛ uniformly dispersed on the upper surface ( FIG. 3 ) or the lower surface ( FIG . 4 ) of the transparent polymer film and then dried to form a light diffusion layer. The second method is to coat the prism-shaped optical structure thereon. However, the compounding method also has a significant decrease in luminance as compared to the light diffusing property, and since the tip of the prism vertex is maintained on the upper surface, the composite sheet and the sheet may be caused by vibration friction between the panel and the panel. It is not an excellent method in that there is a concern about splitting.

As an alternative to conventional composite sheets, Rounded Brightness Enhancement Film (RBEF), which exhibits excellent characteristics in vibration splitting, has been developed and marketed by 3M Corporation. Hemispherical shape of size is formed, It is characterized by the above-mentioned. However, only one such hemispherical shape is formed, and the diameter of the hemisphere is too large to cause a considerable decrease in brightness, and there is a problem that it is much more vulnerable than two or more hemispherical shapes formed for external shock such as vibration.

Accordingly, the present inventors have made diligent research efforts to solve the problems of the prior art. As a result, various shapes of the prism lens are implemented in a hemispherical shape resistant to vibration and scratches, thereby minimizing luminance reduction and improving light diffusivity. The present invention was completed by developing a composite optical sheet in which the sheet delamination caused by vibration friction with the panel was removed.

Therefore, an object of the present invention is to vibrate and scratch the shape of the prism lens in order to improve the light diffusivity while minimizing the brightness deterioration during the manufacture of the optical sheet for the backlight unit, and to not cause the sheet to be cracked by vibrating friction with the panel. It is to provide a composite optical sheet for a backlight unit implemented in a variety of strong hemispherical shape.

In order to achieve the above object, the present invention is a composite optical sheet coated with a transparent resin of a light diffusing layer made of a transparent polymer film and a prism-shaped optical structure having a triangular shape on one side thereof. Provided is a composite optical sheet, characterized in that two or more hemispherical optical structures having a predetermined curvature are arranged in the same grain direction at the tip of one prism vertex having a shape.

In addition, the present invention is a composite optical sheet in which a light diffusion layer made of a transparent polymer film and a prism-shaped optical structure having a triangular shape on one side thereof is coated with a transparent resin, and a prism vertex angle having a triangular shape is basically provided. A hemispherical optical structure having a predetermined curvature is formed, two or more prism shapes having the hemispherical optical structure formed at vertices are overlapped at a constant pitch, and two or more overlapping prism shapes have the same grain direction. It is arranged to provide a composite optical sheet.

The present invention also provides a composite optical sheet in which a light diffusion layer made of a transparent polymer film and a prism-shaped optical structure having a triangular shape on one side thereof are coated with a transparent resin, and a prism vertex angle having a triangular shape is basically provided. The first prism shape in which the hemispherical optical structure having a predetermined curvature is formed and the second prism shape without the hemispherical optical structure at the vertices of the prism are arranged in the same grain direction, and the first prism shape and the first prism shape are formed. The two prism shapes overlap at a constant pitch, and a vertex height of the first prism shape is disposed higher than a vertex height of the second prism shape to provide a composite optical sheet.

In addition, the present invention provides a backlight unit assembly of a liquid crystal display device having a composite optical sheet having the structural features as described above.

The composite optical sheet for a backlight unit according to the present invention has a light scattering effect caused by irregularities formed on the tip of a prism vertex angle, but adds light diffusivity, but unlike a conventional composite sheet accompanied with excessive luminance deterioration, It improves the light flow by controlling the recycling of light by adding the hemispherical optical structure with the curvature of various numbers and shapes to improve the light diffusivity while minimizing the brightness deterioration. There is an advantage that the sheet does not cause the phenomenon caused by vibration friction.

According to the present invention, various shapes of a prism lens are implemented in a hemispherical shape resistant to vibration and scratches, thereby minimizing brightness reduction, improving light diffusivity, and removing a sheet gap caused by vibration friction with a panel. To provide.

Composite optical sheet according to the present invention

1) add two or more hemispherical optical structures having a predetermined curvature to one prism vertex;

2) two or more prism shapes in which a hemispherical optical structure having a predetermined curvature is formed at a prism vertex angle are arranged to overlap at a constant pitch, or

3) The first prism shape having a hemispherical optical structure having a predetermined curvature at the prism vertex angle and the second prism shape having no hemispherical optical structure at the prism vertex angle are arranged in parallel, thereby increasing the vertex height of the first prism shape. It has a characteristic structure that is kept higher than the height of the vertex of the second prism shape and arranged to overlap at a constant pitch.

As described above, the composite optical sheet according to the present invention having a characteristic structure at the prism vertex angle randomly distributes a plurality of scratches on a prism shape pattern having a vertex angle of 90 ° as in the conventional method, thereby complexing the prism sheet and the protective sheet. However, while maintaining the main prism shape having a 90 ° vertex angle, a plurality of spherical lenses called beads are randomly distributed on the back or front surface of the base film to add diffusibility. It is different from the conventional composite optical sheet.

Hereinafter, the composite optical sheet of the present invention will be described in more detail with reference to the accompanying drawings according to the number and shape of the hemispherical optical structures added to the prism vertex angle.

In one embodiment, the present invention is a composite optical sheet in which a light diffusion layer made of a transparent polymer film and a prism-shaped optical structure having a triangular shape on one side thereof are coated with a transparent resin. Provided is a composite optical sheet, characterized in that two or more hemispherical optical structures having a predetermined curvature at the tip of one prism vertex are arranged in the same grain direction.

The polymer film in the above may be adopted without particular limitation as long as it is commonly known in the art for the manufacture of optical sheets, for example polyethylene terephthalate (polyethylene terephtalate, PET), polyethylene naphthalate (polyethylene naphthalate, PEN) ), Plastic films made from oriented polypropylene, polycarbonate (PC), triacetate, and the like.

Figure 5a shows a representative structure of the composite optical sheet according to the present invention of the above characteristics, two hemispherical shapes are arranged side by side at the tip of the prism shape having a vertex angle of 90 degrees. As shown in FIG. 5A , the hemispherical shape with a predetermined curvature is flat at the tip of the prism vertex angle, which is n times the radius of curvature protruding (where n represents the number of hemispheres with curvature protruding at the vertex angle). It may be formed on the surface. For example, if the number of protruding hemispheres is two, two hemispherical shapes may be formed on the flat surface of the tip of the prism vertex angle corresponding to the length of the radius of curvature x 2 of the hemisphere. That is, the length of the hemispherical curvature diameter x 2 is equal to the length of the tip flat surface of the prism vertex angle. FIG. 5B illustrates two superspherical shapes formed at the prism vertex angles in FIG. 5A , and FIG. 5C illustrates a stereoscopic view thereof.

FIG. 6A illustrates a structure in which two hemispherical shapes are arranged along side ridges of a prism vertex having a basically triangular shape at a tip of a prismatic shape having a vertex angle of 90 °, unlike FIG. 5A . 6b . As shown in Fig. 6A , the two hemispherical shapes are formed inscribed to the ridge of the prism vertex angle, in which case the length of the flat surface of the tip of the prism vertex angle having a hemispherical shape is longer than the curvature diameter x 2 of the hemisphere. long.

As described above, two or more hemispherical shapes formed on the prism vertex angle preferably have a radius of curvature of 0.5 to 1.5 μm, and each of these hemispherical shapes may have the same height or different from the base to the highest protruding portion.

When two or more hemispherical optical structures are formed at the vertices of the prism, the vibration gap between the panel and the prism sheet, which may occur while removing the protective sheet, is solved. It is possible to implement a breakthrough composite optical sheet.

FIG. 7 is a composite optical sheet in which two hemispherical optical structures are implemented at a prism vertex angle as shown in FIG. 5A, and only a light diffusing agent having a radius of 0.5 to 25 μm is uniformly formed on a transparent resin solution when only the composite optical sheet is manufactured. It is manufactured by distribution.

FIG. 8 is also a composite optical sheet in which two hemispherical optical structures are implemented at a prism vertex angle, as shown in FIG. 5A, and a light diffusing agent having a radius of 0.5 to 25 μm is uniformly formed on an upper surface of a transparent polymer film when only the composite optical sheet is manufactured. After applying the dispersed binder resin solution and drying to form a light diffusing layer, there is a secondary coating of the characteristic hemispherical optical structure according to the invention on the prism vertex angle thereon.

FIG. 9 is also a composite optical sheet in which two hemispherical optical lenses are implemented at the prism vertex angle, as shown in FIG. 5A , in which only a light diffusing agent having a radius of 0.5 to 25 μm is uniform on the bottom surface of the transparent polymer film when the composite optical sheet is manufactured. After applying the dispersed binder resin solution is dried to form a light diffusion layer, there is a secondary coating of the characteristic hemispherical optical structure according to the invention on the prism vertex angle thereon.

Through the configuration as shown in Figures 7 to 9 it is possible to adjust the finer sheet diffusion. The method of applying the light diffusing layer in the above may be adopted without particular limitation as long as it is a method commonly known in the art, for example, air knife method, gravure method, reverse roll ), Spray (spray) or blade (blade) can be selected arbitrarily.

In another embodiment, the present invention is a composite optical sheet in which a light diffusion layer made of a transparent polymer film and a prism-shaped optical structure having a triangular shape on one side thereof are coated with a transparent resin. Branches have a hemispherical optical structure having a predetermined curvature at the prism vertex angle, and at least two prism shapes having the hemispherical optical structure formed at the vertex angle overlap at a constant pitch, and at least two prism shapes overlapping each other. It is arranged in the same grain direction to provide a composite optical sheet.

Figure 10a shows a representative structure of the composite optical sheet according to the invention of the above characteristics, the two optical structures in which a hemispherical shape having a predetermined radius of curvature is formed at the vertex angle of the prism shape having a vertex angle of 90 ° in parallel They are arranged side by side. FIG. 10B illustrates an overlapping hemispherical optical structure formed at a prism vertex angle in FIG. 10A , and FIG. 10C shows a stereoscopic view thereof.

The radius of curvature of the hemispherical shape formed at the prism vertex angle is in the range of 0.5 to 15 μm, and the distance (overlap distance) between two adjacent vertices in a pair of prism shapes having overlapping hemispherical optical structures is 1 to 50 μm. It is preferable that it is a range. Further, in the pair of prism shapes having overlapping hemispherical optical structures, each hemispherical shape is characterized in that the heights from the base to the highest protruding portion are the same.

FIG. 11A illustrates three prism shapes in which a hemispherical optical structure having a predetermined radius of curvature is formed at a vertex angle of a 90 ° prism shape different from FIG. 10A , and arranged in parallel with each other. Fig. 11b .

Thus, when two or more hemispherical optical structures are superimposed on the prism vertex angle, the vibration divergence between the panel and the prism sheet, which may occur while removing the protective sheet, is solved, and at the same time, the light diffusivity is reduced while the luminance deterioration is small. In addition, it can be secured to implement a breakthrough composite optical sheet.

Figure 12 is a composite optical sheet composed of the two prism shape are side by side overlapping in parallel with an optical structure of the hemispherical shape of the prism apex angle as shown in Figure 10a, only the radius of 0.5 to 25 ㎛ on a transparent resin solution in the manufacture of a compound optical sheet It is prepared by uniformly distributing a light diffusing agent of size.

Figure 13 also is also a compound optical sheet composed of the two prism shape are overlapped side by side in parallel with an optical structure of the hemispherical shape of the prism apex angle, such as 10a, only the radius on the upper surface of the transparent polymer film in the manufacture of a compound optical sheet 0.5 to 25 After coating a binder resin solution in which a light diffusing agent having a size of μm is uniformly dispersed, and then drying to form a light diffusing layer, a bispherical optical structure having a characteristic hemispherical shape according to the present invention is secondly coated thereon.

14 is also a compound optical sheet composed of the two prism shape are overlapped side by side in parallel with an optical structure of the hemispherical shape of the prism apex angle as shown in Figure 10a, only the radius of 0.5 to a lower surface of the transparent polymer film in the manufacture of a compound optical sheet After coating a binder resin solution in which a 25 μm-sized light diffusing agent is uniformly dispersed, and then drying to form a light diffusing layer, there is a secondary coating of the characteristic hemispherical optical structure according to the present invention on the prism vertex angle.

12 to 14 it is possible to adjust the more fine sheet diffusion properties. The method of applying the light diffusion layer in the above may be adopted without particular limitation as long as it is commonly known in the art, for example, air knife method, gravure method, reverse roll (reverse) A roll method, a spray method or a blade method can be arbitrarily selected.

In yet another embodiment, the present invention provides a composite optical sheet coated with a transparent resin in a light diffusing layer made of a transparent polymer film and a prism-shaped optical structure having a triangular shape on one side thereof. A first prism shape in which a hemispherical optical structure having a predetermined curvature is formed at a prism vertex angle having a second prism shape and a second prism shape without such a hemispherical optical structure at the prism vertex angle are arranged in the same grain direction, The first prism shape and the second prism shape overlap each other at a constant pitch, and the height of the vertex of the first prism shape is provided higher than the height of the vertex of the second prism shape.

15A illustrates a representative structure of the composite optical sheet according to the present invention having the above-described characteristics, and includes a first prism shape in which a hemispherical optical structure having a predetermined curvature is formed at a prism vertex having a triangular shape. A second prism shape in which the hemispherical shape is not formed at the prism vertex angle is arranged in parallel, and the first prism shape and the second prism shape overlap each other at a constant pitch, and the height of the vertex of the first prism shape is zero. It is characterized in that it is disposed higher than the vertex height of the two prism shape. FIG. 15B illustrates a superimposed first prism shape and a second prism shape arranged side by side in FIG. 15A , and FIG. 15C illustrates a three-dimensional view thereof.

The radius of curvature of the hemispherical shape formed at the prism vertex angle of the first prism shape is in a range of 0.5 to 15 μm, and the distance between two adjacent vertices in the structure where the first prism shape and the second prism shape overlap ) Is preferably in the range from 1 to 50 μm. Further, it is preferable that the difference between the vertex height of the first prism shape and the vertex height of the second prism shape is in the range of 0.5 to 25 μm.

As such, when the first prism shape in which the hemispherical optical structure having a predetermined curvature is formed at the prism vertex angle and the second prism shape in which the hemispherical shape is not formed are superimposed in parallel, it is generated while removing the protective sheet. The vibration gap between the panel and the prism sheet can be solved, and at the same time, it is possible to secure the light diffusivity while reducing the luminance decrease, thereby enabling the implementation of a breakthrough composite optical sheet.

Figure 16 is a composite optical sheet of the first prism and the second prism such a hemispherical shape is not formed with an optical structure of the hemispherical shape of the prism apex angle is configured side by side in parallel, as shown in Fig 15a, only in the manufacture of a compound optical sheet It is prepared by uniformly distributing a light diffusing agent having a radius of 0.5 to 25 μm on a transparent resin solution.

FIG. 17 is also a composite optical sheet in which a first prism shape having a hemispherical optical structure at a prism vertex angle and a second prism shape in which such a hemispherical shape is not formed are parallel to each other, as in FIG. 15A . Applying a binder resin solution in which a light diffusing agent having a radius of 0.5 to 25 μm is uniformly dispersed on the upper surface of the transparent polymer film, and then drying to form a light diffusing layer, a prism having a characteristic hemispherical optical structure according to the present invention is formed thereon. Second coating on the corner.

18 is also the first as the composite optical sheet of the second prism shaped prism that the shape and this semi-spherical shape is formed is composed of side-by-side in parallel, and only producing a composite optical sheet having an optical structure of the hemispherical shape of the prism apex angle as shown in Fig. 15a After applying a binder resin solution in which a light diffusing agent having a radius of 0.5 to 25 μm is uniformly dispersed on a lower surface of the transparent polymer film, and then drying to form a light diffusing layer, a characteristic hemispherical optical structure according to the present invention is formed thereon. Second coating on the prism vertex angle.

16 to 18 it is possible to adjust the more delicate sheet diffusion properties. The method of applying the light diffusing layer in the above may be adopted without particular limitation as long as it is a method commonly known in the art, for example, air knife method, gravure method, reverse roll ), Spray (spray) or blade (blade) can be selected arbitrarily.

The scope of the present invention includes a backlight unit assembly of a liquid crystal display device having the composite optical sheet described above.

The backlight unit assembly according to the present invention generally includes a lamp unit for generating light, a lamp reflector that surrounds a lamp and guides light generated from the lamp to the light guide plate, a light guide plate for guiding light generated by the lamp, And a reflector sheet disposed below the light guide plate and configured to reflect light, wherein a diffuser sheet for light diffusion is formed on the upper side of the light guide plate. It is characterized in that the composite optical sheet according to the invention is laminated.

19 illustrates a representative structure of a backlight unit assembly to which a composite optical sheet according to the present invention is applied, and includes a basic configuration of a lamp unit, a lamp reflector, a light guide plate, a reflector sheet, and a diffusion sheet, and an upper surface of the diffusion sheet. According to the composite optical sheet has a laminated structure.

FIG. 20 illustrates a backlight unit assembly having a structure in which the composite optical sheet according to the present invention is directly stacked on the upper surface of the light guide plate without the diffusion sheet for light diffusion on the upper side of the light guide plate.

FIG. 21 is a structure in which a composite optical sheet according to the present invention is directly stacked on an upper surface of a light guide plate without a diffusion sheet as shown in FIG. 20 , or a structure in which a hemispherical optical structure formed at a vertex angle of a prism of the composite optical sheet faces the light guide plate. The backlight unit assembly is shown.

FIG. 22 illustrates a backlight unit assembly having a structure in which two to three composite optical sheets according to the present invention are stacked on a top surface of a light guide plate without a diffusion sheet as shown in FIG. 20 .

As described above, the backlight unit assembly to which the composite optical sheet according to the present invention is applied is applicable to both a backlight unit for a notebook, a backlight unit for a monitor, and a backlight unit for a TV.

The specific parts of the present invention have been described in detail above, and it is apparent to those skilled in the art that such specific descriptions are merely preferred embodiments, and thus the scope of the present invention is not limited thereto. something to do. Thus, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

1 is a cross-sectional view of a backlight unit used in a conventional liquid crystal display device;

2 is a front view of a conventional composite optical sheet in which a plurality of scratches are randomly distributed on a rectangular prism shape pattern having a vertex angle of 90 °,

FIG. 3 is a cross-sectional view of a conventional composite optical sheet in which a prism-shaped optical structure is secondarily coated on a light diffusion layer formed by applying a binder resin solution in which a light diffusing agent is uniformly dispersed on an upper surface of a transparent polymer film.

FIG. 4 is a cross-sectional view of a conventional composite optical sheet in which a prism-shaped optical structure is secondarily coated on a light diffusion layer formed by applying a binder resin solution in which a light diffusing agent is uniformly dispersed on a lower surface of a transparent polymer film.

Figure 5a shows an embodiment of a composite optical sheet according to the present invention in which two hemispherical optical structures are arranged side by side at one prism-shaped tip with a vertex angle of 90 °,

FIG. 5B is a superimposed view of two hemispherical optical structures formed at one prism vertex in FIG. 5A ;

FIG. 5C is a three-dimensional view of FIG . 5B ,

Figure 6a shows an embodiment of the composite optical sheet according to the present invention in which two hemispherical optical structures are arranged inscribed along the lateral ridges of the prism vertex at one prism-shaped tip with a vertex angle of 90 °,

FIG. 6B is a superposition of two hemispherical optical structures formed inscribed along side ridges of one prism vertex angle in FIG. 6A ;

FIG. 7 illustrates a composite optical sheet according to the present invention in which two hemispherical optical structures are implemented at one prism vertex as shown in FIG. 5A after forming a prism shape by uniformly dispersing a light diffusing agent on a transparent resin solution . Showing an embodiment,

8 is a composite according to the present invention in which two hemispherical optical structures are implemented at one prism vertex angle as shown in FIG. 5A on a light diffusion layer formed by applying a binder resin solution in which a light diffusing agent is uniformly dispersed on an upper surface of a transparent polymer film . Shows an embodiment of an optical sheet,

9 is a composite according to the present invention in which two hemispherical optical structures are implemented at one prism vertex angle as shown in FIG. 5A on a light diffusion layer formed by applying a binder resin solution in which a light diffusing agent is uniformly dispersed on a lower surface of a transparent polymer film . Shows an embodiment of an optical sheet,

10A illustrates an embodiment of a composite optical sheet according to the present invention, in which two prism shapes in which a hemispherical optical structure having a predetermined radius of curvature is formed at a vertex angle of a prism shape having a 90 ° vertex angle are arranged side by side in parallel. It shows an aspect,

FIG. 10B illustrates two prismatic shapes in which a hemispherical optical structure is formed at a vertex in FIG. 10A .

FIG. 10C is a three-dimensional view of FIG . 10B ,

11A illustrates an embodiment of a composite optical sheet according to the present invention in which three prism shapes in which a hemispherical optical structure having a predetermined radius of curvature is formed at a vertex angle of a prism shape having a vertex angle of 90 ° are arranged side by side in parallel. It shows an aspect,

FIG. 11B illustrates three prismatic shapes in which a hemispherical optical structure is formed at a vertex in FIG. 11A .

12 is a pattern in which a prism shape is formed by uniformly dispersing a light diffusing agent on a transparent resin solution, and two prism shapes in which a hemispherical optical structure is formed at a vertex angle of the prism as shown in FIG. One embodiment of the composite optical sheet according to the invention is shown,

FIG. 13 is a cross-sectional view of two prism shapes in which a hemispherical optical structure is formed at a prism vertex angle of FIG. 10A and a light diffusion layer formed by applying a binder resin solution in which a light diffusing agent is uniformly dispersed on an upper surface of a transparent polymer film . Shows an embodiment of a composite optical sheet according to the present invention,

FIG. 14 illustrates two prism shapes in which a hemispherical optical structure is formed at a vertex angle of a prism on a light diffusion layer formed by applying a binder resin solution in which a light diffusing agent is uniformly dispersed on a lower surface of a transparent polymer film, as shown in FIG. 10A. Shows an embodiment of a composite optical sheet according to the invention arranged

Fig. 15A shows a first prism shape in which a hemispherical optical structure having a predetermined curvature is formed at a vertex angle of a prism formation having a vertex angle of 90 °, and a second prism shape in which such hemispherical shape is not formed in the prism vertex angle is parallel. The first optical prism shape and the second prism shape overlap each other at a constant pitch, and the height of the vertex of the first prism shape is disposed higher than the height of the vertex of the second prism shape. One embodiment,

FIG. 15B illustrates a first prism shape in which a hemispherical optical structure is formed in FIG. 15A and a second prism shape without such a hemispherical shape.

FIG. 15C shows the stereogram of FIG . 15B ,

FIG. 16 is a first prism shape in which a hemispherical optical structure is formed at a prism vertex angle as shown in FIG. 15A after a light diffusing agent is uniformly dispersed on a transparent resin solution to form a prism shape . One embodiment of the composite optical sheet according to the present invention in which the prism shapes are arranged side by side in parallel,

FIG. 17 is a first prism shape in which a hemispherical optical structure is formed at a prism vertex angle as shown in FIG. 15A on a light diffusion layer formed by applying a binder resin solution in which a light diffusing agent is uniformly dispersed on an upper surface of a transparent polymer film . One embodiment of the composite optical sheet according to the present invention, in which the second prism shapes without the other are arranged side by side in parallel,

FIG. 18 is a first prism shape in which a hemispherical optical structure is formed at a prism vertex angle as shown in FIG. 15A on a light diffusion layer formed by applying a binder resin solution in which a light diffusing agent is uniformly dispersed on a lower surface of a transparent polymer film, and such a hemispherical shape One embodiment of the composite optical sheet according to the present invention, in which the second prism shapes without the other are arranged side by side in parallel,

19 illustrates a backlight unit assembly in which a composite optical sheet according to the present invention is stacked on an upper surface of the diffusion sheet in a backlight unit assembly including a lamp unit, a lamp reflector, a light guide plate, a reflector sheet, and a diffusion sheet,

20 illustrates a backlight unit assembly in which a composite optical sheet according to the present invention is directly stacked on an upper surface of a light guide plate without a diffusion sheet in a backlight unit assembly including a lamp unit, a lamp reflector, a light guide plate, a reflector sheet, and a diffusion sheet. Will,

FIG. 21 illustrates a backlight unit assembly in which a composite optical sheet according to the present invention is directly stacked on an upper surface of a light guide plate without a diffusion sheet as shown in FIG. 20 , but an optical structure formed at a prism vertex angle of the composite optical sheet faces the light guide plate. ,

22 is a backlight unit assembly comprising a lamp unit, a lamp reflector, a light guide plate, a reflector sheet, and a diffusion sheet, in which two to three composite optical sheets according to the present invention are stacked on an upper surface of the light guide plate without including the diffusion sheet; An assembly is shown.

<Description of the symbols for the main parts of the drawings>

1: fluorescent lamp, 2: light guide plate

3: lamp reflector, 4: reflector sheet

5: diffusion sheet, 6: prism sheet

7: protective sheet, 8: mold frame

9: back cover, 10: panel of liquid crystal display

11: bezel

Claims (27)

In a composite optical sheet in which a light diffusion layer made of a transparent polymer film and a prism-shaped optical structure having a triangular shape on one side thereof are coated with a transparent resin, a tip of one prism vertex angle having a triangular shape basically. And at least two hemispherical optical structures having a predetermined curvature in the same grain direction. The method of claim 1, The two or more hemispheres are formed inscribed along the side ridge line of the prism vertex angle. The method of claim 1, Wherein the two or more hemispherical shapes are formed on the flat surface of the prism tip corresponding to a length equal to n times the hemispherical curvature diameter (where n is the number of hemispherical shapes having a predetermined curvature projecting at the vertex angle). Composite optical sheet. The method of claim 1, The two or more hemispherical shapes each having a radius of curvature of 0.5 to 1.5 ㎛. The method of claim 1, The two or more hemispheres in the composite optical sheet, characterized in that the height from the base portion of each hemispherical shape to the highest protruding portion is the same. The method of claim 1, Composite optical sheet, characterized in that the height from the base of each hemispherical shape to the most protruding portion is different in the two or more hemispherical shape. The method according to any one of claims 1 to 6, The prism shape is formed by coating with a transparent resin solution uniformly dispersed in the light diffusing agent having a radius of 0.5 to 25 ㎛ size on the solution. The method according to any one of claims 1 to 6, The composite optical sheet, characterized in that the light diffusion layer is formed by applying a binder resin solution in which the light diffusing agent having a radius of 0.5 to 25 ㎛ uniformly dispersed on the upper surface of the transparent polymer film and then dried. The method according to any one of claims 1 to 6, Composite optical sheet, characterized in that the light diffusion layer is formed by applying a binder resin solution in which the light diffusing agent having a radius of 0.5 to 25 ㎛ uniformly dispersed on the lower surface of the transparent polymer film and then dried. In a composite optical sheet in which a light diffusion layer made of a transparent polymer film and a prism-shaped optical structure having a triangular shape on one side thereof are coated with a transparent resin, a predetermined curvature is applied to a prism vertex angle having a triangular shape. Has a hemispherical optical structure is formed, two or more prismatic shapes formed with the hemispherical optical structure is superimposed at a constant pitch, two or more overlapping prism shapes are arranged in the same grain direction Composite optical sheet. The method of claim 10, Composite optical sheet, characterized in that the hemispherical shape has a radius of curvature of 0.5 to 15 ㎛. The method of claim 10, And a distance (overlap distance) between two adjacent vertices in the overlapping two or more prism shapes is in a range of 1 to 50 μm. The method of claim 10, The overlapping optical sheet of the two or more prisms, characterized in that the height from the base of each hemispherical shape to the highest protruding portion are the same. The method according to any one of claims 10 to 13, The prism shape is formed by coating with a transparent resin solution uniformly dispersed in the light diffusing agent having a radius of 0.5 to 25 ㎛ size on the solution. The method according to any one of claims 10 to 13, The composite optical sheet, characterized in that the light diffusion layer is formed by applying a binder resin solution in which the light diffusing agent having a radius of 0.5 to 25 ㎛ uniformly dispersed on the upper surface of the transparent polymer film and then dried. The method according to any one of claims 10 to 13, Composite optical sheet, characterized in that the light diffusion layer is formed by applying a binder resin solution in which the light diffusing agent having a radius of 0.5 to 25 ㎛ uniformly dispersed on the lower surface of the transparent polymer film and then dried. A composite optical sheet in which a light diffusion layer made of a transparent polymer film and a prism-shaped optical structure having a triangular shape on one side thereof are coated with a transparent resin, and a predetermined curvature is applied to a prism vertex angle having a triangular shape. The first prism shape in which the hemispherical optical structure is formed and the second prism shape without such a hemispherical optical structure in the prism vertex angle are arranged in the same grain direction, and the first prism shape and the second prism shape are The composite optical sheet overlapping with a predetermined pitch, wherein the height of the vertex of the first prism shape is higher than the height of the vertex of the second prism shape. The method of claim 17, The hemispherical shape formed in the prism vertex angle of the said 1st prism shape has the radius of curvature of 0.5-15 micrometers, The composite optical sheet characterized by the above-mentioned. The method of claim 17, And a distance (overlapping distance) between two adjacent vertices in a structure where the first prism shape and the second prism shape overlap each other, in a range of 1 to 50 μm. The method of claim 17, And a difference between a vertex height of the first prism shape and a vertex height of the second prism shape is in a range of 0.5 to 25 μm. The method according to any one of claims 17 to 20, The prism shape is formed by coating with a transparent resin solution uniformly dispersed in the light diffusing agent having a radius of 0.5 to 25 ㎛ size on the solution. The method according to any one of claims 17 to 20, The composite optical sheet, characterized in that the light diffusion layer is formed by applying a binder resin solution in which the light diffusing agent having a radius of 0.5 to 25 ㎛ uniformly dispersed on the upper surface of the transparent polymer film and then dried. The method according to any one of claims 17 to 20, Composite optical sheet, characterized in that the light diffusion layer is formed by applying a binder resin solution in which the light diffusing agent having a radius of 0.5 to 25 ㎛ uniformly dispersed on the lower surface of the transparent polymer film and then dried. A lamp unit for generating light, A lamp reflector that surrounds the lamp and directs the light generated by the lamp to the light guide plate, A light guide plate for guiding light generated by the lamp, and In the backlight unit assembly comprising a reflector sheet (refelector sheet) disposed on the lower side of the light guide plate to reflect light, A diffuser sheet for light diffusion is optionally provided on an upper surface of the light guide plate, and the composite optical sheet according to any one of claims 1 to 23 is stacked thereon. The method of claim 24, In the backlight unit assembly having the above-described configuration, the composite optical sheet according to any one of claims 1 to 23 is directly stacked on the upper surface of the light guide plate without including the diffusion sheet on the upper surface of the light guide plate. . The method of claim 25, When the composite optical sheet is laminated on the upper surface of the light guide plate, the optical unit formed on the prism vertex angle of the composite optical sheet is laminated so as to face the light guide plate. The method of claim 24, In the backlight unit assembly having the above configuration, the composite optical sheet according to any one of claims 1 to 23 is laminated on the upper surface of the light guide plate without including the diffusion sheet on the upper surface of the light guide plate. Backlight Unit Assembly.

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