KR100703953B1 - Optical film and lighting device having the same - Google Patents

Abstract

The present invention relates to an optical film having an optical pattern having a microstructure having a peak formed on at least one surface thereof, wherein the optical pattern is formed with a defect correction structure for non-sharpening the peak area.

As a result, various defects including scratches are hardly seen, thereby minimizing product defects, thereby increasing product yield with ease of operation, and providing an optical film and an illumination device having the same, which improves productivity and product competitiveness.

Optical film, optical pattern, corner angle, scratch, lighting device

Description

Optical film and lighting device having the same

1a and 1b is a simplified configuration diagram of a lighting device having a conventional optical film,

3 to 7 is a partial cross-sectional view and a partial perspective view of the optical film according to the first embodiment of the present invention,

8 to 11 are optical pattern area microscopic observation photographs of an optical film according to a second embodiment of the present invention;

12 to 13 are optical pattern area microscopic observation photographs of an optical film according to a third embodiment of the present invention;

Figure 14a is a microscope enlarged photograph of a conventional optical film,

14b is a view showing luminance performance results according to the viewing angle of the optical film of FIG. 14a;

15A, 16A, and 17A are enlarged micrographs of the first to third optical films according to the present invention;

15B, 16B, and 17B illustrate luminance performance results according to viewing angles of the first to third optical films of FIGS. 15A, 16A, and 17A, respectively;

18 to 20 is a view showing the results of the luminance performance of the optical film and their viewing angle according to an embodiment of the present invention,

21 to 23 are simplified schematic diagrams of a lighting apparatus having an optical film according to the present invention.

* Explanation of symbols for the main parts of the drawings

 1: optical film 3: optical pattern

10: irregular shape 10 ': irregular microstructure

50: cotton tube member

The present invention relates to an optical film and a lighting apparatus having the same, and more particularly, to an optical film having an improved optical structure and a lighting apparatus having the same so as to compensate for scratches and defects of the optical film.

The edge light type lighting device 100 and the direct type lighting device 100 'for an LCD TV provided in an LCD monitor and a display device such as an LCD or an LCD TV for a mobile phone are shown in FIGS. 1A and 1B, respectively. As shown in the figure, optical films 103 and 103 'are provided to collect and refract light incident from the light sources 102 and 102' and exit the liquid crystal panels 105 and 105 'to display an image on the liquid crystal panels 105 and 105'.

As shown in the drawing, the optical films 101 and 101 'for condensing and refraction of the lighting devices 100 and 100' have a plurality of optical patterns 103 and 103 'formed in triangular cross sections with peaks 103a and valleys. It has a structure that is linearly arranged to have 103b.

However, in the conventional optical film, since the optical pattern has a triangular cross-sectional shape having a sharp vertex in the peak area, the optical pattern is manufactured in a manufacturing process, a storage management process, and a bonding process with other optical parts for constructing an illumination device. There has been a problem in that defects such as scratches are generated in the peak area of the optical pattern due to operator's carelessness or contact with other optical parts.

As a result, detailed attention is required in the manufacturing process and operation of the optical film, which causes problems in productivity and competitiveness due to deterioration in workability and product yield.

Accordingly, an object of the present invention, an optical film and lighting having the same, which can increase the product yield with the convenience of manufacturing, can improve the productivity and product competitiveness, and can minimize product defects due to defects such as scratches. To provide a device.

According to the present invention, an optical film having a microstructured optical pattern having a peak formed on at least one surface thereof is provided with an uneven shape or groove in a height region of 40% or less from a vertex of the peak of the optical pattern. The optical film is characterized in that a defect correction structure for desharpening the peak area is formed by irregular shapes in which any one of the shapes is formed regularly or irregularly.

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In this case, the optical pattern has a triangular cross-section is more preferably linearly arranged on the at least one surface when projecting.

Alternatively, the optical pattern may have any one of a triangular pyramid, a polygonal pyramid, and a conical shape and may be distributed on the at least one surface.

On the other hand, according to another aspect of the present invention, in the optical film having an optical pattern formed on at least one surface, the scratch or burr by artificial processing in the height region of 30% or less from the vertex of the peak of the optical pattern ( It is also achieved by an optical film, characterized in that a defect correction structure is formed by irregular microstructures formed by Burr).

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At this time, the irregular microstructure is effective by the artificial defect structure of fine scratches or microscratches by sandblasting or microblasting processing.

Here, it is preferable that the optical pattern has a triangular cross section and is linearly arranged on the at least one surface in planar projection.

Alternatively, the optical pattern may have any one of a triangular pyramid, a polygonal pyramid, and a conical shape and may be distributed on the at least one surface.

On the other hand, the object is in accordance with another aspect of the present invention, a panel provided in the surface light source, the upper region of the surface light source, and the panel is disposed between the surface light source and the panel and the light transmitted from the surface light source An illuminating device having an optical film for condensing and refraction in a light source, wherein the optical film is also achieved by an illuminating device, which is an optical film having the defect correction structure.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

3 to 7 are partial cross-sectional views and partial perspective views of the optical film according to the first embodiment of the present invention. As shown in these figures, the optical film 1 according to the present embodiment has an optical pattern 3 for collecting and refracting incident light and an optical defect such as a scratch that may occur in the optical pattern 3. It includes a defect correction structure to correct.

The optical pattern 3 has a structure in which a plurality of triangular cross-sectional shapes are linearly arranged in plan view, forming a peak 3a and a valley 3b. The optical pattern 3 may be integrally formed on at least one surface of the film, or may be molded on at least one surface of the film using a separate light-transmissive resin material. Of course, although not shown, the optical pattern 3 may have a variety of shapes such as triangular pyramids, polygonal pyramids, or cones with peaks, and may be distributed on at least one surface of the optical film 1.

The defect correction structure is formed of an anomalous shape portion 10 which de-sharpens the vertex angle regions of the peaks 3a of the optical patterns 3 so as not to be sharp. As shown in FIGS. 3 and 7, the irregular shape portion 10 may be formed by forming various irregularities, grooves, or the like in the vertex angle region of the peak 3a of the optical pattern 3. Of course, the irregular shape portion 10 may be formed in various shapes under the conditions of non-sharpening the vertex of the peak (3a) in addition to the above-described shape.

In this case, the irregular shape 10 may be distributed over the entire areas of the peaks 3a of the optical patterns 3, and may be regularly spaced with respect to the entire areas of the peaks 3a of the optical patterns 3. It may be distributed at irregular intervals. In addition, the formation region of the irregular shape portion 10 is preferably formed in a height region of 40% or less from the apex 3a of the peak 3a of the optical pattern 3, in particular, the irregular shape portion ( More preferably, the formation region of 10) is formed in a height region of 30% or less from the apex of the peak 3a with respect to the height of the peak 3a of the optical pattern 3.

The ratio of the distribution region of the irregular shape portion 10 and the formation region of the irregular shape portion 10 to the height of the peak 3a of the optical pattern 3 is a condition for maximizing the luminance characteristic of the optical film 1. Experimental results on this will be described later.

In the optical film 1 according to the present embodiment having such a structure, since the vertex angle regions of the peaks 3a of the optical patterns 3 are not sharply formed, the manufacturing process, the storage management process, and the lighting apparatus of the optical film 1 In the bonding process with other optical components for construction, even if contact with other optical components occurs, defects such as scratches do not occur.

8 to 11 are photographs of optical pattern regions of the optical film according to the second embodiment of the present invention. As shown in these drawings, the optical film 1 according to the present embodiment has the same structure as the above-described first embodiment except for the defect correction structure. Therefore, only the defect correction structure of the optical film 1 according to the present embodiment will be described below.

The defect correction structure of the optical film 1 according to the present exemplary embodiment is formed with irregular microstructured portions 10 'in the vertex angle regions of the peaks 3a of the optical patterns 3. The irregular microstructure 10 'artificially forms various defect structures such as scratches or burrs at the vertex of the peak 3a of the optical pattern 3, and the irregular microstructure 10' May be distributed over the entire area of the vertex angles of the peaks 3a of the optical patterns 3, or may be distributed at regular intervals or irregularly with respect to the entire area of the vertex angles of the peaks 3a of the optical patterns 3; . In this case, although not shown, the optical pattern 3 may have a shape such as a triangular pyramid having a peak, a polygonal pyramid, a cone, or the like and distributed on at least one surface of the optical film 1.

In addition, the irregular microstructure 10 'is preferably formed in a height region of 30% or less from the apex of the peak 3a with respect to the height of the peak 3a of the optical pattern 3.

The ratio of the formation region of the irregular shape portion 10 to the distribution region of the irregular microstructure portion 10 'and the height of the peak 3a of the optical pattern 3 is the same as that of the first embodiment described above. As a condition for maximizing the luminance characteristic of, the experimental result thereof will be described later.

In the optical film 1 according to the present embodiment having such a structure, a defect structure is artificially formed in advance in the vertex angle of the peak 3a of the optical patterns 3, thereby manufacturing and storing and managing the optical film 1. And defects, such as scratches, in the bonding process with other optical components for the construction of the lighting device, the defects are included in the irregular microstructure 10 ', in which the defects are formed in advance. Invisible

12 to 13 are microscopic observation patterns of optical patterns of the optical film according to the third embodiment of the present invention. As shown in these figures, the optical film 1 according to the present embodiment has the same structure as the above-described embodiments except for the defect correction structure. Therefore, hereinafter, the optical film 1 according to the present embodiment will also be described only for the defect correction structure.

The defect correction structure of the optical film 1 according to the present embodiment is formed with irregular microstructured portions 10 'on the surfaces of the optical patterns 3. The irregular microstructure portion 10 ′ is formed by an artificial defect structure such as fine roughness or microscratch through sand blasting or micro blasting processing on the surface of the optical pattern 3.

The irregular microstructures 10 ′ may be distributed over the entire surface of the optical patterns 3, or may be distributed at regular intervals or irregularly with respect to the entire surface of the optical patterns 3. The irregular region of the microstructure 10 'is a condition for maximizing the luminance characteristic of the optical film 1, and an experimental result thereof will be described later.

The optical film 1 according to the present embodiment having such a structure artificially forms a defect structure on the surfaces of the optical patterns 3 in advance so that the manufacturing process, the storage management process, and the configuration of the lighting apparatus of the optical film 1 can be realized. Although defects such as scratches occur in the bonding process with other optical components, the defects are included in the irregular microstructure portion 10 ′ in which the defects are formed in advance, and the defects are not seen when the optical film 1 is viewed as a whole.

Meanwhile, hereinafter, the luminance performance of the optical film 1 according to the present invention is compared with the luminance performance of the conventional optical films 101 and 101 '.

FIG. 14A is a magnified image of a conventional optical film, and FIG. 14B is a luminance performance result sheet according to the viewing angle of the optical film of FIG. 14A, and FIGS. 15A, 16A, and 17A are first to third optical films according to the present invention. 15B, 16B, and 17B are luminance performance result sheets according to viewing angles of the first to third optical films of FIGS. 15A, 16A, and 17A, respectively. As shown in these drawings, the brightness performance results of the conventional optical film (101, 101 ') and the optical film (1) according to the present invention was tested as shown in Table 1 below.

Brightness Maximum luminance ratio Average luminance Average luminance ratio Conventional Optical Film Structure 7233.12 100% 922.13 100% First optical film of the present invention 7275.91 100.6% 976.43 105.9% Invention Second Optical Film 6924.08 95.7% 1032.03 111.9% Invention Third Optical Film 6751.88 93.3% 1040.12 112.8%

Table-1 (luminance unit: Nit)

As can be seen in the drawings and Table-1, the optical film 1 according to the present invention showed a result that the maximum brightness decreases as the depth and pitch of the coupling correction structure formed on the optical pattern 3 increases.

However, the optical films 1 according to the present invention showed a result that the average luminance is increased compared to the conventional optical films 101 and 101 '. This is because the scattering action of the light occurs due to the defect correction structure (anomalous shape portion 10) formed in the optical pattern 3 of the optical film 1 according to the present invention, and the luminance is observed in the entire planar region of the optical film 1. Means to rise.

On the other hand, the following describes the luminance performance change test results according to the size of the defect correction structure (anomalous shape portion 10) of the optical film 1 according to the present invention. This is for deriving a condition for maximizing the luminance characteristic of the optical film 1 with respect to the formation area ratio of the defect correction structure (the irregular shape portion 10) with respect to the height of the peak 3a of the optical pattern 3 described above.

18 to 20 are views showing the results of the luminance performance of the optical film and the viewing angle thereof according to an embodiment of the present invention. As shown in these figures, the defect correction structure formed on the optical films 1 subjected to this test changes the size of the defect correction structure (defect correction structure with respect to the height of the optical pattern 3) in the same shape. Luminance performance was tested. In this case, the change in the size of the defect correction structure is that when the height of the conventional optical pattern 103 is 100%, the defect correction structure of the optical film 1 according to the present invention is 20% to 40 from the peak of the conventional optical pattern 103. The luminance characteristics were tested by varying the height (depth) of the% region. As a result, the luminance performance results are shown in Table 2 below.

Brightness Maximum luminance ratio Average luminance Average luminance ratio Conventional optical film (height 100%) 7233.12 100% 922.13 100% Invention Optical Film A (20%) 6954.57 96.15% 1095.51 118.8% Invention Optical Film B (30%) 6635.14 91.73% 1162.13 126.0% Invention Optical Film C (40%) 6298.66 87.08% 1093.02 118.5%

Table-2 (luminance unit: Nit)

As can be seen in the drawing and Table-2, the optical films 1 according to the present invention have a maximum luminance lowered as the size (depth) of the bonding correction structure formed in the optical pattern 3 increases in the same shape, As the size (depth) of the defect correction structure increases, the average luminance increases and then decreases at some point.

And, by this result, when the size (depth) of the defect correction structure of the optical film 1 according to the present invention is formed with a size (depth) between 20% to 40% from the peak vertex of the optical pattern (3). It has been shown that the desired brightness performance can be achieved. In particular, it can be seen that the optical film 1 according to the present invention has the best luminance performance when the defect correction structure is formed between 20% and 30% from the peak vertex of the optical pattern 3.

As a result of the experiment, the optical film 1 according to the present invention has improved luminance performance compared to the conventional optical films 101 and 101 ', and when the lighting apparatus is configured, the optical film 1 does not have to be provided with a separate scattering sheet. The brightness can be improved.

On the other hand, Figure 21 to Figure 23 is a block diagram of a lighting apparatus having an optical film according to the present invention described above. As shown in these figures, the optical film 1 according to the present invention is the surface light source 51 and the panel 53 in the edge light type lighting device 50 and the direct type lighting device 50 'for LCD TVs. Coupled between, the light incident from the surface light source is focused and refracted to be emitted toward the panel.

In the process of combining the optical film 1 with other optical parts, defects such as scratches may occur in the optical pattern 3 of the optical film 1 due to inadvertent contact with an adjacent part or operator's carelessness. Since the optical film 1 according to the present invention includes a defect correction structure as described above, even if a defect such as a scratch occurs, the defect can be optically compensated by a defect correction structure in which the defect is formed in advance.

In addition, the distribution ratio, structure, and the like of the defect correction structure improve the luminance performance of the optical film 1 without providing a separate scattering sheet. Thereby, the manufacturing process and manufacturing cost of the lighting apparatus 100, 100 'can be reduced.

As described above, the optical film according to the present invention can be more conveniently operated by the operator in the manufacturing process, storage management process, and other optical components for the configuration of the lighting device, and scratches such as scratches on the optical pattern This may not degrade the quality even if this occurs.

In addition, the luminance can be improved without providing a separate sheet.

Accordingly, productivity and product competitiveness may be improved by increasing production yield along with convenience of manufacturing and operation, and product defects may be minimized.

As described above, according to the present invention, various defects including scratches are not easily seen, thereby minimizing product defects, thereby increasing product yield with ease of operation, and improving optical productivity and product competitiveness. There is provided an illumination device.

Claims (13)

In an optical film having a microstructured optical pattern having a peak on at least one surface, A defect correction structure is formed in the height region of 40% or less from the vertex of the peak of the optical pattern by denormalizing the peak region by irregular shapes in which one of irregularities or irregularities is regularly or irregularly formed. An optical film, characterized in that. delete delete The method of claim 1, The optical pattern has a triangular cross-section, the optical film, characterized in that the linear arrangement on the at least one surface when projecting. The method of claim 1, The optical pattern has a shape of any one of triangular pyramid, polygonal pyramid or conical shape is distributed on at least one surface. In an optical film having an optical pattern formed on at least one surface, An optical film, characterized in that the defect correction structure is formed by irregular microstructures formed by scratches or burrs due to artificial processing in a height region of 30% or less from a vertex of the peak of the optical pattern. delete delete delete The method of claim 6, The irregular microstructure is an optical film, characterized in that provided by an artificial defect structure of fine scratches or microscratches by sandblasting or microblasting processing. The method of claim 6, The optical pattern has a triangular cross-section, the optical film, characterized in that the linear arrangement on the at least one surface when projecting. The method of claim 6, The optical pattern has a shape of any one of triangular pyramid, polygonal pyramid or conical shape is distributed on at least one surface. An illumination device having a surface light source, a panel provided in an upper region of the surface light source, and an optical film disposed between the surface light source and the panel to condense and refract light transmitted from the surface light source to the panel. The optical film is an illumination device, characterized in that the optical film of any one of claims 1, 4, 5, 6, 10, 11, 12.

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