KR100512193B1 - Optical film and back-light unit has them - Google Patents

Abstract

The present invention relates to an optical film and a backlight unit having the same, wherein a plurality of first patterns having an optical cross section for scattering incident light is formed on one surface of the film; The second surface of the film has a plurality of second patterns having an optical cross section for emitting incident light in all directions, and a plurality of third patterns having an optical cross section formed along the pattern surface of the second pattern and emitting incident light in a substantially vertical direction. A pattern is formed.

Thereby, there is provided an optical film and a backlight unit having the same, which can improve productivity and workability and can reduce manufacturing cost and product defect rate.

In addition, there is provided an optical film and a backlight unit having the same, which can minimize optical defects such as moire stains.

In addition, there is provided an optical film and a backlight unit having the same that can exhibit a wide viewing angle and high brightness.

Description

Optical film and back-light unit has them

The present invention relates to an optical film and a backlight unit having the same, and relates to an optical film having an improved structure so as to solve an optical defect and a backlight unit having the same.

In the display device for displaying an image, various optical films are used to improve the image display performance of the device.

For example, as illustrated in FIG. 13, the backlight unit 101 of the display device includes a reflective film 130, a diffusion film 140, a prism film 150, and a protective film between the light guide plate 110 and the panel 120. Optical films such as 160 are sequentially disposed to optically control the light from the light guide plate 110 to the panel 120, thereby improving image display performance such as viewing angle, brightness, and sharpness of the image displayed on the panel 120. Let's go.

However, in the case of using a combination of various optical films such as the diffusion film 140 and the prism film 150, the size of the device is not only large, but also causes a problem in that productivity and manufacturing cost increase due to the increase in the production process. do.

In addition, when the optical coupling between the optical film is achieved by the inadvertent inflow of the foreign matter frequently or by the formation of scratches due to contact, there is a problem that causes workability and product defect rate increase.

In addition, the optical contact range between each optical film is largely formed, there is a problem that moiré pattern occurs due to wet-out phenomenon, and a stain pattern occurs due to inflow of dust particles.

Accordingly, an object of the present invention is to provide an optical film and a backlight unit having the same, which can improve productivity and workability, and can reduce manufacturing cost and product defect rate.

In addition, to provide an optical film and a backlight unit having the same that can minimize optical defects, such as moire stain.

In addition, it is to provide an optical film and a backlight unit having the same that can exhibit a wide viewing angle and high brightness.

The above object is, according to the present invention, in the optical film, a plurality of first patterns having an optical cross section for scattering incident light is formed on one surface of the film; The second surface of the film has a plurality of second patterns having an optical cross section for emitting incident light in all directions, and a plurality of third patterns having an optical cross section formed along the pattern surface of the second pattern and emitting incident light in a substantially vertical direction. A pattern is formed by the optical film characterized by the above-mentioned.

Wherein the optical cross section of the first pattern is formed in a partial arc shape; The optical cross section of the second pattern is formed in a partial arc shape, and the optical cross section of the third pattern is formed in a triangular shape.

The second pattern is distributed in the form of embossing in planar projection, and the third pattern is effectively arranged linearly at a predetermined interval from each other in planar projection.

In this case, it is more preferable that the second pattern has any shape of a circle, an ellipse, or a polygon in planar projection.

Alternatively, the second pattern may be linearly arranged at a predetermined distance from each other in planar projection, and the third pattern may be linearly arranged in parallel with the second pattern at a predetermined distance from each other in planar projection.

In addition, the second pattern may be linearly arranged at a predetermined interval from each other in planar projection, and the third pattern may be linearly arranged at a predetermined interval from each other in a direction crossing the second pattern in planar projection.

Here, the optical cross-sectional size of the first pattern is preferably smaller than the optical cross-sectional size of the second pattern.

The optical cross section of at least one of the second pattern and the first pattern may have a concave shape recessed inwardly of the film or a convex shape projecting outwardly of the film, and among the second pattern and the first pattern. The other optical cross section is effectively a concave shape recessed inwardly of the film or a convex shape projecting outwardly of the film.

In this case, at least one optical cross section of the second pattern, the third pattern, and the first pattern may be formed at equal intervals or may have mutual boiling intervals.

The first pattern is preferably distributed in the form of embossing in planar projection.

Alternatively, the first pattern may have a shape of a circle, an ellipse, or a polygonal shape in planar projection.

In addition, the first pattern may be linearly arranged at a predetermined interval from each other in planar projection.

On the other hand, the film, the second pattern, the third pattern and the first pattern is preferably formed integrally using any one material of polycarbonate, PVC, PP, PE, PET, acrylic polymer.

Alternatively, the film, the second pattern, the third pattern, and the first pattern may be formed using at least one material of polycarbonate, PVC, PP, PE, PET, and acrylic polymer, respectively, and may be laminated on each other. have.

Here, it is more effective that the light diffusing particles 17 are contained inside at least one of the film, the second pattern, the third pattern, and the first pattern.

At this time, the light diffusing particles 17 is any one of acrylic particles, styrene particles, silicon particles, synthetic silica, grass beads, diamond as transparent particles, or titanium oxide, zinc oxide, barium sulfate, calcium carbonate as white particles It is preferable that it is any of magnesium carbonate, aluminum hydroxide, and clay.

On the other hand, according to another aspect of the present invention, in the backlight unit having a light guide plate which is a light source, an optical film disposed on the light guide plate, and a panel disposed on the optical film to display an image, The optical film is provided with any one of the above-described optical film, wherein the optical film is disposed so that the third pattern toward the panel and the first pattern toward the light guide plate. Is also achieved.

On the other hand, according to another aspect of the present invention, in the backlight unit having a light guide plate as a light source, an optical film disposed on the light guide plate, and a panel disposed on the optical film to display an image, The optical film is provided with any one of the above-described optical film, the optical film is a backlight unit, characterized in that the third pattern is directed toward the light guide plate and the first pattern toward the panel. It is also achieved by

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

1 is a perspective view of an optical film according to a first exemplary embodiment of the present invention, FIGS. 2A and 2B are front and reverse cross-sectional views of the optical film of FIG. 1, respectively, and FIG. 3 is a bottom view of the optical film of FIG. 1. As shown in these drawings, the optical film 1 according to the present exemplary embodiment collects incident light along a pattern surface of the second pattern 11 and diffracted and refracts incident light on one surface of the film. A third pattern 13 for refraction is formed; It has a structure in which the 1st pattern 15 which scatters incident light is formed in the back surface of a film.

The film is formed of any one of polycarbonate, PVC, PP, PE, PET, and acrylic polymer as a light transmissive material that can transmit light smoothly in the visible region. The film may be integrally formed with each of at least one of the second pattern 11, the third pattern 13, and the first pattern 15, or may be laminated with each other. In this case, the film, the second pattern 11, the third pattern 13, and the first pattern 15 may be molded using any one of the above materials, or may be formed using different materials from the above materials. Can be.

The second pattern 11 is a partial spherical shape in which each pattern is formed in an optical cross section of a partial arc in cross-sectional projection, and is circular in a flat projection, and a plurality of second patterns 11 are mutually seen in the plane of the film. It is distributed in the form of embossing at predetermined intervals.

Here, as described above, the second pattern 11 may be integrally formed on one side of the film, and separately formed using the same or different material as the film among the aforementioned materials, and then laminated on one side of the film. Can be.

In addition, the second pattern 11 may be formed in a structure that protrudes to the outside of the film, as shown in FIGS. 1 and 2A and 2B, and as shown in FIGS. 5A to 5C, the second pattern 11 is formed to be recessed inward of the film. May be In addition, although not shown in the drawing, the second pattern 11 may be formed as a concave-convex structure in which a protruding structure and a recessed structure are alternately formed. At this time, the intervals between the respective second patterns 11 may be distributed at equal intervals as shown in the drawing, and in order to adjust the optical properties of the optical film 1, the respective boiling patterns of the second patterns 11 are mutually boiled. Of course, it can be distributed at intervals.

The third pattern 13 has a structure in which each pattern is formed in a triangular optical section when projecting a cross section, and a plurality of third patterns 13 are arranged in parallel and arranged in parallel at a predetermined interval when viewed in the plane of the film. Have

The third pattern 13 collects the incident light on the pattern surface, and then emits the light by refracting it in a direction substantially perpendicular to the pattern surface. At this time, since the third pattern 13 is formed along the pattern surface of the second pattern 11, the light refracted in the vertical direction with respect to each pattern surface eventually radiates radially as shown in FIGS. 2A and 2B. do. Thus, the emitted light is diffused over a wide viewing angle range while maintaining high brightness.

As described above, the third pattern 13 may also be integrally formed along the pattern surface of the second pattern 11 at one side of the film, and may be separately formed using the same or different material as the film. After being molded, it may be laminated on the pattern surface of the second pattern 11 on one side of the film.

Here, the intervals of the respective third patterns 13 may be distributed at equal intervals as shown in FIGS. 1, 2A, and 2B, and for adjusting the optical characteristics of the optical film 1. It is a matter of course that the patterns 11 may be distributed at boiling intervals.

Meanwhile, like the second pattern 11, the first pattern 15 is a partial sphere shape in which each pattern is formed in an optical cross section on a partial arc in cross-sectional projection and is circular in a plane projection. As can be seen from 1 to 3, a plurality of first patterns 15 are distributed in an embossed form at a predetermined interval from each other.

The optical cross section size of the first pattern 15 is smaller than the optical cross section size of the second pattern 11. This is for condensing and scattering the incident light to exhibit high brightness, and at the same time to reduce the visual recognition of the scratches and foreign matter contained in the optical film 1 by the scattering of light.

Here, as described above, the first pattern 15 may be integrally formed on the back surface of the film, and may be separately formed using the same or different material from the above-described material and then laminated on one side of the film. Can be.

In addition, the first pattern 15 may be formed to have a structure recessed inward from the rear surface of the film, as shown in FIGS. 1 and 2A and 2B, and as shown in FIGS. 4A and 4B, the structure is recessed to the outside of the film. It may be formed as. In addition, although not shown in the drawing, the first pattern 15 may be formed as a concave-convex structure in which a protruding structure and a recessed structure are alternately formed. That is, when the structure of the second pattern 11 is protruding, the first pattern 15 may be formed as a protruding, recessed or uneven structure, and the structure of the second pattern 11 is recessed. In this case, the first pattern 15 may include a protruding or recessed or uneven structure.

At this time, the interval between each first pattern (15) also. As shown in FIGS. 1 to 4B, the first patterns 15 may be distributed at equal intervals to adjust the optical characteristics of the optical film 1. to be.

Meanwhile, the optical film 1 according to the present invention may change the structures of the second pattern 11, the third pattern 13, and the first pattern 15 into various structures for adjusting optical characteristics.

For example, when the structure of the second pattern 11 is viewed in the plane of the film, it may be circular, as shown in FIGS. 1 and 5A, or an ellipse as shown in FIGS. 6A and 6B, or a polygon such as FIGS. 7A and 7B. It can be formed in any one shape of an image, and it can be set as the structure which linearly arranges the 3rd pattern 13 along the pattern surface of the 2nd pattern 11. FIG.

In addition, as shown in FIGS. 8A and 8B, when the structure of the second pattern 11 is viewed in the plane of the film, the respective second patterns 11 are linearly arranged with a predetermined interval therebetween, and the third pattern 13 is disposed. It can also be formed in a structure arranged linearly along the pattern surface of the second pattern 11 in parallel with the second pattern 11 at predetermined intervals.

Alternatively, as shown in FIGS. 9A and 9B, when the structure of the second pattern 11 is viewed in the plane of the film, the respective second patterns 11 are linearly arranged with a predetermined interval therebetween, and the third pattern 13 is disposed. The structure may be formed in a linear arrangement along the pattern surface of the second pattern 11 in the direction crossing the second pattern 11 at predetermined intervals.

In addition, the structure of the first pattern 15 may also be formed in any shape of a circle, an ellipse, or a polygonal shape when viewed in the plane of the film, and the cross sections of the partial arcs are linearly arranged at predetermined intervals from each other. I can do it with the structure that there is.

By such a configuration, when the optical film 1 according to the present invention is incident to the first pattern 15 forming side of the optical film 1, as shown in FIG. 2A, the incident light is emitted from the first pattern 15. The light is collected and scattered toward the second pattern 11. This scattering of light prevents visual transmission of foreign substances and stains such as scratches and dusts that may be included in the optical film 1 to the viewer.

Light passing through the first pattern 15 toward the second pattern 11 is focused in the diffusion pattern and then directed to the third pattern 13.

Then, the light incident on the third pattern 13 is focused on the pattern surface of the third pattern 13 and then refracted in a direction substantially perpendicular to the pattern surface and emitted. At this time, since the third pattern 13 is formed along the pattern surface of the second pattern 11, light refracted in the vertical direction with respect to each pattern surface is emitted radially as shown in FIG.

Thus, the emitted light is diffused over a wide viewing angle range while maintaining high brightness.

On the other hand, in the optical film 1 according to the present invention, as shown in Figure 2b, the light is incident to the third pattern 13 forming side of the optical film 1 may be emitted to the first pattern 15 side.

The light incident on the third pattern 13 is focused on the pattern surface of the third pattern 13 and then refracted in a direction substantially perpendicular to the pattern surface, and then passes through the second pattern 11 to pass through the first pattern 15. To be delivered.

At this time, since the third pattern 13 is formed along the pattern surface of the second pattern 11, the light refracted in the vertical direction with respect to each pattern surface is diffused and refracted radially as described above, and thus the first pattern ( 15). Such diffusion of light may also prevent visual transmission of foreign substances and stains such as scratches and dusts that may be included in the optical film 1 to the viewer.

Since the light incident on the first pattern 15 is focused on the first pattern 15 and then diffused outward from the pattern surface, the emitted light is diffused in a wide viewing angle range while maintaining high luminance.

On the other hand, the optical film 1 according to the present invention, as shown in Figure 10, may include light diffusion particles 17 to diffuse the light therein.

The light diffusing particles 17 may include any one of acrylic particles, styrene particles, silicon particles, synthetic silica, grass beads, and diamond as transparent particles, or titanium oxide, zinc oxide, barium sulfate, calcium carbonate, and magnesium carbonate as white particles. It is preferable that any one of aluminum hydroxide and clay is used.

When the light diffusing particles 17 form the optical film 1, the light diffusing particles 17 are formed on at least one of the film, the second pattern 11, the third pattern 13, and the first pattern 15. It may be distributed evenly to, as shown in, may be distributed to the entire area inside the optical film (1). When the light diffusing particles 17 are included in the optical film 1 as described above, the incident light is diffused without being lost, thereby realizing high brightness at the exit side, and scratches and dirt that may be included in the film. Prevents foreign objects and stains from being transmitted to the viewer visually.

On the other hand, Figure 11 and Figure 12 is a simplified block diagram of the backlight unit to which the optical film according to the present invention is applied. As shown in these drawings, the optical film 1 according to the present invention is disposed between the light guide plate 110 and the panel 120 of the backlight unit 101 to the light incident from the light guide plate 110 panel 120 Eject toward you.

In this case, the arrangement structure of the optical film 1 has a structure in which the second pattern 11 and the third pattern 13 face the panel 120 and the first pattern 15 face the light guide plate 110 as shown in FIG. 11. 12, the second pattern 11 and the third pattern 13 may face the light guide plate 110 and the first pattern 15 may face the panel 120. . The optical film 1 disposed as described above diffuses light passing through the optical film 1 to the emission side at a high brightness by the condensing, diffusing, and scattering action as described above.

As described above, the optical film and the backlight unit having the same according to the present invention have a second pattern and a third pattern having an optical cross section that emits incident light in all directions on one surface of the optical film, and scatter the incident light on the back surface of the film. By forming the first pattern, when the incident light is emitted, it can be diffused in a wide range while maintaining high brightness.

In addition, even if optical defects such as scratches and dust and other foreign defects occur in the optical film due to minor carelessness in the manufacturing process of the optical film and the backlight unit having the same, such defects may be visually observed to the observer by the diffusion and scattering of light. Can be prevented from being delivered. Therefore, workability can be improved and product defect rate can be reduced in the manufacturing process of the optical film and the backlight unit having the same.

In addition, since the third pattern is formed along the pattern surface of the second pattern to form a structure having a relatively high peak and a relatively low peak, and the first pattern also has an optical cross-sectional structure having a height and height, other adjacent optical materials Optical coupling with a protective film or light guide plate, for example, can reduce the contact range to a minimum that is not visible to the human eye. As a result, the wet-out phenomenon is minimized and the moiré pattern is minimized.

Of course, the optical film according to the present invention has a light condensing, diffusing, and scattering effect on a single optical film, a multi-functional compact optical as compared to an optical film using a combination of various films such as conventional diffusion film and prism film The film can be manufactured, and the size of the device such as a backlight unit can be reduced. In addition, productivity can be improved because production processes and manufacturing costs can be reduced.

As described above, according to the present invention, there is provided an optical film and a backlight unit having the same, which can improve productivity and workability, and can reduce manufacturing cost and product defect rate.

In addition, there is provided an optical film and a backlight unit having the same, which can minimize optical defects such as moire stains.

In addition, there is provided an optical film and a backlight unit having the same that can exhibit a wide viewing angle and high brightness.

1 is a perspective view of an optical film according to a first embodiment of the present invention;

2a and 2b are respectively an optical film forward and reverse cross-sectional view of FIG.

3 is a bottom view of the optical film of FIG.

4 to 10 is a view showing an optical film according to another embodiment of the present invention,

11 and 12 are simplified configuration diagrams of an optical film and a backlight unit having the same according to the present invention;

13 is a simplified configuration diagram of a conventional optical film and a backlight unit having the same.

* Explanation of symbols for the main parts of the drawings

 10 film 11 second pattern

 13: third pattern 15: first pattern

101: backlight unit

Claims (19)

In the optical film, A plurality of first patterns having an optical cross section for scattering incident light is formed on one surface of the film; The second surface of the film has a plurality of second patterns having an optical cross section for emitting incident light in all directions, and a plurality of third patterns having an optical cross section formed along the pattern surface of the second pattern and emitting incident light in a substantially vertical direction. Optical film, characterized in that the pattern is formed. The method of claim 1, The optical cross section of the first pattern is formed in a partial arc shape; The optical cross section of the second pattern is formed in a partial arc shape, and the optical cross section of the third pattern is formed in a triangular shape. The method of claim 2, The second pattern is distributed in the form of embossing in planar projection, and the third pattern is an optical film, characterized in that the linear arrangement at a predetermined interval from each other in the plane projection. The method of claim 3, The second pattern has an optical film, characterized in that any one of a circular or elliptic or polygonal shape in the plane projection. The method of claim 2, The second pattern is linearly arranged at a predetermined interval from each other in the plane projection, The third pattern is an optical film, characterized in that the linear arrangement in parallel with the second pattern at a predetermined interval from each other in the plane projection. The method of claim 2, The second pattern is linearly arranged at a predetermined interval from each other in the plane projection, And the third pattern is linearly arranged at a predetermined interval from each other in a direction intersecting with the second pattern during planar projection. The method according to any one of claims 2 to 6, The optical cross-sectional size of the first pattern is smaller than the optical cross-sectional size of the second pattern. The method of claim 7, wherein The optical cross section of at least one of the second pattern and the first pattern is a concave shape recessed inwardly of the film or a convex shape projecting outwardly of the film, The optical cross section of the other of the second pattern and the first pattern is a concave shape recessed inwardly of the film or a convex shape projecting outwardly of the film. The method of claim 8, The optical film of at least one of the second pattern, the third pattern and the first pattern is formed at equal intervals. The method of claim 8, The optical film of at least one of the second pattern, the third pattern, and the first pattern is formed at boiling intervals to each other. The method according to any one of claims 8 to 10, The first pattern is an optical film, characterized in that distributed in the form of embossing in planar projection. The method according to any one of claims 8 to 10, The first pattern is an optical film, characterized in that having a shape of any one of a circular or elliptic or polygonal shape in the plane projection. The method according to any one of claims 8 to 10, The first pattern is an optical film, characterized in that the linear arrangement at a predetermined interval from each other in the plane projection. The method of claim 1, The film, the second pattern, the third pattern and the first pattern is an optical film, characterized in that formed integrally using any one material of polycarbonate, PVC, PP, PE, PET, acrylic polymer. The method of claim 1, The film, the second pattern, the third pattern and the first pattern are formed using at least one material of polycarbonate, PVC, PP, PE, PET, and acrylic polymer, respectively, and are laminated to each other. Optical film. The method of claim 1, An optical film, characterized in that the light diffusion particles are contained in at least one of the film, the second pattern, the third pattern and the first pattern. The method of claim 16, The light diffusing particles may be any one of acrylic particles, styrene particles, silicon particles, synthetic silica, glass beads, and diamond as transparent particles, or titanium oxide, zinc oxide, barium sulfate, calcium carbonate, magnesium carbonate, and hydroxide as white particles. An optical film, characterized in that any one of aluminum, clay. In the backlight unit having a light guide plate as a light source, an optical film disposed on the light guide plate, and a panel disposed on the optical film to display an image, The optical film is an optical film of any one of claims 1 to 6, or an optical film of any one of claims 8 to 10, or an optical film of any one of claims 14 to 17. Prepared; And the optical film is disposed such that the third pattern faces the panel and the first pattern faces the light guide plate. In the backlight unit having a light guide plate as a light source, an optical film disposed on the light guide plate, and a panel disposed on the optical film to display an image, The optical film is an optical film of any one of claims 1 to 6, or an optical film of any one of claims 8 to 10, or an optical film of any one of claims 14 to 17. Prepared; And the optical film is disposed such that the third pattern faces the light guide plate and the first pattern faces the panel.