KR101085844B1 - Optical film - Google Patents

Abstract

The present invention relates to an optical film, wherein the optical film according to the present invention is formed on both surfaces of the prism pattern which are embossed or engraved in a triangular prism shape, the first surface and the angle different from the first surface. And a second surface connected to each other, wherein the first and second surface lengths are respectively formed with protrusions or depressions having 4.5 to 12.5 μm, and the prism pitch is formed within 60 to 150 °, and the prism pitch is 30 It is formed in the range of ˜100 μm, and the angle between the first and second surfaces is 90 to 156 °.

According to the present invention, the light guide plate used in the liquid crystal display device can be grafted, but by forming a separate prism pattern on the surface of the prism pattern, the luminance can be increased and the viewing angle improvement effect can be obtained.

Optical film, prism, surface, first, second, third surface

Description

Optical film {OPTICAL FILM}

The present invention relates to an optical film, and more particularly to an optical film that can improve the brightness and viewing angle than conventional by structuring the surface of the prism pattern.

In general, one of the known optical films is called "Brightness Enhancement Film (BEF)" or "Prism Film", which cure special acrylic synthetic resin with high energy ultraviolet light on polyester optical film. It has a good spectral structure formed on a polyester optical film with a thickness of only 50-200 microns. The main function of the brightness enhancement film (BEF) focuses in the direction of about 35 degrees on the axis and collects scattered light emitted from the light guide in all directions by refraction and total internal reflection to improve the brightness of the liquid crystal display. It is to reinforce.

In particular, although the prism sheet of the related art is not shown in the drawing, the prism type of the mountain type or the lens type of the semi-spherical pattern is formed, but these patterns have a problem in that the luminance and the viewing angle are limited.

The present invention has been made to solve the above problems, the purpose of which can be grafted to the light guide plate used in the liquid crystal display device, the brightness of the conventional prism sheet by forming a separate prism pattern on the surface of the prism pattern It is to provide an optical film that can be raised, the viewing angle improvement effect can be obtained.

In order to achieve the above object, the present invention, the first surface and the second surface connected to the first surface and the first surface on both surfaces of the prism pattern embossed or engraved and continuously arranged in a triangular prism shape Wherein the first and the second surface length is 4.5-12.5㎛ projections or depressions are formed respectively, the prism angle is formed within 60 ~ 150 °, the prism pitch is formed within the range of 30 ~ 100㎛ The angle between the first and second surfaces is 90 to 156 degrees.

In addition, in the present invention, the first surface and the second surface and the second surface connected at different angles to the first surface on both surfaces of the prism pattern that are embossed or engraved and continuously arranged in a triangular prism shape. A third surface connected at different angles, wherein the first and third surface lengths are 4.5 to 12.5 μm, and the second surface lengths are formed at protrusions or depressions having 1.6 to 10.9 μm, respectively. Is formed within 60 to 150 degrees, the prism pitch is formed within a range of 30 to 100 µm, and an angle between each of the first and second surfaces and the second and third surfaces is 123 to 145 degrees.

In addition, the prism pattern in the present invention is characterized in that both surfaces are symmetrical or asymmetrical.

In addition, the protrusion or the depression in the present invention is characterized in that the left and right symmetry or left and right asymmetry.

In addition, the vertex of the protrusion or the valley of the depression in the present invention is characterized in that the rounding is formed.

Such an optical film of the present invention can be grafted to a light guide plate or the like used in a liquid crystal display device, but by forming separate prism patterns on both surfaces of the prism pattern to increase luminance and obtain a viewing angle improvement effect than a conventional prism sheet. Can be.

Hereinafter, an embodiment of the optical film of the present invention with reference to the accompanying drawings will be described.

<Example 1>

As shown in FIG. 1, the optical film 100 according to the present exemplary embodiment includes a body 110, a prism 120, and an auxiliary prism 130.

The body 110 is emitted through an upper surface (surface) which is a light exit surface in the process of scattering the incident light and the one side wall is a light incident surface, the cold cathode fluorescent lamp as a light source on one side wall or both side walls of the body 110 A light source (not shown) such as a (CCFL) or a light emitting diode (LED) is installed. In particular, when the light source is a light emitting diode, the light is incident in the form of a dot and emitted in the form of a plane.

The prism 120 is embossed and continuously arranged in a triangular prism shape at the top of the body 110, and is formed in a number of positions to have a set size, bone depth, pitch (P), and outer angle (θ) so as to form a light source (Fig. The light irradiated from (not shown) is collected and finely patterned to improve luminance.

Here, the prism 120 is exemplified as both surfaces 122 are symmetrical protrusions in this embodiment, and the auxiliary prism 130 is integrally formed on both surfaces 122. At this time, the prism 120 is symmetrical but exemplified that the vertices are formed on the prism mountain, but the asymmetric shape is possible, and the curved surface is formed so as to have a set radius on the prism mountain.

And it is preferable that the pitch P of the prism 120 is formed in the range of 30-100 micrometers, etc., It is preferable that the internal angle (theta) which is a mountain angle is formed in the range of 60-150 degrees.

The auxiliary prism 130 has a first surface 132 relative to both surfaces 122 of the prism 120 and a second surface connected at different angles to the first surface 132. 134) to form a protruding triangular pillar shape.

In this case, although the first surface 132 and the second surface 134 constituting the auxiliary prism 130 are symmetrical with respect to the surface 122, the left and right asymmetry may be changed. And the angle θ ₁ between the first surface 132 which is a horizontal plane and the second surface 134 which is a vertical plane is 90 to 156 °.

On the other hand, the distance from the vertex of the prism 120 to the starting point of the first surface 132 of the auxiliary prism 130 is referred to as (L ₁ ), the length of the first surface 132 is referred to as (L ₂ ) The length of the second surface 134 is referred to as (L ₃ ).

Hereinafter, in the auxiliary prism 130 which doubles the brightness enhancement and the viewing angle improvement to the effect of the prism 120, two prism sheets bef are applied (vertical and horizontal) and the first surface 132. The luminance and viewing angles along the angle between the second surface 134 and the lengths of the first surface 132 and the second surface 134 are described.

Here, the auxiliary prism 130 has an angle θ ₁ between the first surface 132 and the second surface 134, the prism 120 pitch P, and the first as shown in FIGS. 2A, 2B, and 2C. According to the lengths (L ₂ , L ₃ ) of the first surface 132 and the second surface 134, they can be classified into large, medium (basic) and small. At this time, the angle θ ₁ between the first surface 132 and the second surface 134 illustrates a case of 90 °.

For the large size, the distance L ₁ from the vertex of the prism 120 to the start point of the first surface 132 of the auxiliary prism 130 is 8.8 μm, and both surfaces ( 122, the angles θ ₂ and θ _{3 of} the first surface 132 and the second surface 134 are 135 °, respectively, and the angle between the first surface 132 and the second surface 134 ( θ ₁ ) is 90 °, the lengths L ₂ , L _{3 of} the first and second surfaces 132, 134 are 12.5 μm, respectively, and the prism 120 pitch P is 12.5 μm. (See Figure 2A)

For the medium size, the distance L ₁ from the vertex of the prism 120 to the starting point of the first surface 132 of the auxiliary prism 130 is 13.3 μm, and both surfaces of the prism 120 122, the angles θ ₂ and θ _{3 of} the first surface 132 and the second surface 134 are 135 °, respectively, and the angle between the first surface 132 and the second surface 134 ( θ ₁ ) is 90 °, the lengths L ₂ , L _{3 of} the first and second surfaces 132, 134 are 6.3 μm, respectively, and the prism 120 pitch P is 18.8 μm. (See Figure 2b)

Finally, for the small size, the distance L ₁ from the vertex of the prism 120 to the starting point of the first surface 132 of the auxiliary prism 130 is 15.5 μm, The angles θ ₂ and θ _{3 of} the first surface 132 and the second surface 134 are 135 ° with respect to both surfaces 122, respectively, and the angles of the first surface 132 and the second surface 134 are different. The angle θ ₁ is 90 °, the lengths L ₂ and L _{3 of} the first and second surfaces 132 and 134 are 4.7 μm, respectively, and the prism 120 pitch P is 18.8 μm. Decide (See Figure 2c)

Thus, when two sheets (vertical, horizontal) of the prism sheet (bef) is applied to simulate the large, medium, and small size of the auxiliary prism 130, the luminance values shown in Table 1 and Tables 2 and 3 You can see the viewing angle.

As a result, the lengths L ₂ and L ₃ of the first surface 132 and the second surface 134 are 12.5 μm through Tables 1, 2, 3 and 3, and the first surface 132 and the second surface ( The angle (θ ₁ ) between the 134 and 90 ° reference luminance values is equivalent to that of the prism sheet bef having two (vertical and horizontal) angles of the first surface 132 and the second surface 134. It can be seen that as the lengths L ₂ and L ₃ become smaller, the 90 ° reference luminance value increases. Particularly, when the lengths L ₂ and L _{3 of} the first surface 132 and the second surface 134 are simulated to 4.7 μm or less, which is a small size of the auxiliary prism 130, the 90 ° reference luminance value increases. Able to know.

Next, in the auxiliary prism 130 which doubles the luminance improvement and the viewing angle improvement to the effect, when the angle θ ₁ between the first surface 132 and the second surface 134 is 156 °, the luminance and viewing angle Explain about. At this time, the first surface 132 and the second surface 134 form an oblique line.

The auxiliary prism 130 has an angle θ ₁ between the first surface 132 and the second surface 134, the prism 120 pitch P and the first surface (as shown in FIGS. 4 to 9). 132 and the length L ₂ , L ₃ of the second surface 134 can be classified into large, medium (basic), small.

For large sizes, the distance L ₁ from the vertex of the prism 120 to the starting point of the first surface 132 of the auxiliary prism 130 is 8.8 μm, as shown in FIGS. 4 and 5, and the prism The angles θ ₂ , θ ₃ of the first surface 132 and the second surface 134 relative to both surfaces 122 of 120 are 168 °, respectively, and the first surface 132 and the second surface. The angle θ ₁ between 134 is 156 °, and the lengths L ₂ and L _{3 of} the first and second surfaces 132 and 134 are respectively 8.8 μm, and the prism 120 pitch P is 12.5. Specify the specification in μm.

In the case of the medium size, as shown in FIGS. 6 and 7, the distance L ₁ from the vertex of the prism 120 to the start point of the first surface 132 of the auxiliary prism 130 is 13.3 μm, and the prism The angles θ ₂ , θ ₃ of the first surface 132 and the second surface 134 relative to both surfaces 122 of 120 are 168 °, respectively, and the first surface 132 and the second surface. An angle θ ₁ between 134 is 156 °, and the lengths L ₂ and L _{3 of} the first and second surfaces 132 and 134 are respectively 4.5 μm, and the prism 120 pitch P is 18.8. Specify the specification in μm.

Finally, for the small size, as shown in FIGS. 8 and 9, the distance L ₁ from the vertex of the prism 120 to the start point of the first surface 132 of the auxiliary prism 130 is 15.5 μm. And the angles θ ₂ and θ ₃ of the first surface 132 and the second surface 134 based on both surfaces 122 of the prism 120 are 168 °, respectively. The angle θ ₁ between the second surfaces 134 is 156 °, and the lengths L ₂ and L _{3 of} the first and second surfaces 132 and 134 are 3.4 μm, respectively, and the prism 120 pitch P ) Is specified as 18.8 μm.

As such, when two (vertical and horizontal) prism sheets (bef) are applied and simulated based on the large, medium, and small sizes of the auxiliary prism 130, an angle having a data value equal to or higher than that of the prism film is MAX. 90 ° and MIN 156 °. (See FIGS. 5, 7 and 9)

<Example 2>

The optical film 200 according to the present exemplary embodiment includes a body 210, a prism 220, and an auxiliary prism 230 as shown in FIG. 10.

The body 210 is emitted through an upper surface (surface) which is a light exit surface in the process of scattering the incident light and one side wall is a light incident surface, the cold cathode fluorescent lamp as a light source on one side wall or both side walls of the body 210 A light source (not shown) such as a (CCFL) or a light emitting diode (LED) is installed. In particular, when the light source is a light emitting diode, the light is incident in the form of a dot and emitted in the form of a plane.

The prism 220 is embossed and continuously arranged in a triangular prism shape at the top of the body 210, and is formed in a number of positions to have a set size, bone depth, pitch (P), and outer angle (θ). The light irradiated from (not shown) is collected and finely patterned to improve luminance.

Here, the prism 220 is illustrated in the present embodiment as both surfaces 222 are symmetrical protrusions, and an auxiliary prism 230 is integrally formed on both surfaces 222. In this case, the prism 220 is symmetrical and vertexes are illustrated as the vertices are formed on the prism mountain, but asymmetrical shapes are possible, and the prism 220 may be modified to have a curved surface to have a set radius.

And it is preferable that the pitch P of the prism 220 is formed in the range of 30-100 micrometers, etc., It is preferable that the internal angle (theta) which is an acid angle is formed in the range of 60-150 degrees.

The auxiliary prism 230 has a first surface 232 relative to both surfaces 222 of the prism 220 and a second surface connected at different angles to the first surface 232. 234 and a third surface 236 connected at different angles to the second surface 234 to form a protruding trapezoidal pillar shape.

In this case, although the first surface 232 and the third surface 236 constituting the auxiliary prism 230 are symmetrical with respect to the surface 222, the left and right asymmetry may be changed. And the horizontal plane of the first surface angle (θ ₁₎ between the 232 and the inclined surface of the second surface 134, each of (θ ₁₎ and the inclined surface of the second surface 234 and the vertical surface of the third surface 236 between the Is characterized by being 123 to 145 °.

On the other hand, the distance from the vertex of the prism 220 to the starting point of the first surface 232 of the auxiliary prism 230 is referred to as (L ₁ ), the length of the first surface 232 and the third surface 236 refers to the length that each of (L _2), the third the length of the surface 236 (L _3), as referred to, the La (L ₄₎ the length of the end point of the third surface 236 to the bottom surface 222 It is called.

Hereinafter, in the auxiliary prism 230 which doubles the brightness enhancement and the viewing angle improvement to the effect of the prism 220, two prism sheets bef are applied (vertical and horizontal) and the first surface 232. And luminance according to the second surface 234 and the angle between the second surface 234 and the third surface 236 and the length of the first surface 232 and the second surface 234 and the third surface 236. And the viewing angle.

Here, the auxiliary prism 230 has an angle between each of the first surface 232 and the second surface 234 and each of the second surface 234 and the third surface 236, as shown in FIGS. 11A, 11B and 11C. (θ ₁ ), large, medium (basic) according to the prism 220 pitch P and the lengths L ₂ , L _{3 of} the first surface 232, the second surface 234, and the third surface 236. ), Can be classified into cattle. In this case, the angle θ ₁ between the first surface 232 and the second surface 234 and the second surface 234 and the third surface 236 is 135 °.

For large sizes, the distance L ₁ from the vertex of the prism 220 to the start point of the first surface 232 of the auxiliary prism 230 is 4.4 μm, and both surfaces 222 of the prism 220 are L. FIG. ₁ , L ₄ , the angles θ ₂ , θ ₃ of the first surface 232 and the third surface 236 are 135 °, respectively, and the first surface 232 and the second surface 234, and The angle θ ₁ between the second surface 234 and the third surface 236 is 135 °, and the lengths L ₂ of the first and third surfaces 232 and 236 are each 12.5 μm, and the second The length L ₃ of the surface 234 is 8.8 μm, and the prism 220 pitch P is 63 μm. (See FIG. 11A)

For the medium size, the distance L ₁ from the vertex of the prism 220 to the start point of the first surface 232 of the auxiliary prism 230 is 8.8 μm, and both surfaces 222 of the prism 220 By reference, the angles θ ₂ , θ ₃ of the first surface 232 and the third surface 236 are 135 °, respectively, and the first surface 232, the second surface 234, and the second surface 234 are respectively. The angle θ ₁ between the and the third surface 236 is 135 °, respectively, and the length L ₂ of the first and third surfaces 232 and 236 is 8.8 μm, respectively, and the length of the second surface 234. (L ₃ ) is 8.8 μm, the length L ₄ from the end of the third surface 236 to the bottom of the surface 222 is 8.8 μm, and the prism 220 pitch P is 12.5 μm. . (See Figure 11B)

Finally, for the small size, the distance L ₁ from the vertex of the prism 220 to the starting point of the first surface 232 of the auxiliary prism 230 is 15.5 μm, and both surfaces of the prism 220 222, the angles θ ₂ , θ ₃ of the first surface 232 and the third surface 236 are 135 °, respectively, and the first surface 232, the second surface 234, and the second surface The angle θ ₁ between 234 and the third surface 236 is 135 °, respectively, and the length L ₂ of the first and third surfaces 232 and 236 is 4.7 μm, respectively, and the second surface 234. ), The length L ₃ is 4.4 μm, the length L ₄ from the end of the third surface 236 to the bottom of the surface 222 is 8.8 μm, and the prism 220 pitch P is 12.5 μm. Set the specification. (See Figure 11C)

Thus, when two sheets (vertical and horizontal) of the prism sheet (bef) is applied to simulate the large, medium, and small size of the auxiliary prism 230, the luminance values shown in Table 4 below, and Tables 5 and 6 You can see the viewing angle.

As a result, the lengths L ₂ of the first surface 232 and the third surface 236 are 12.5 μm, and the first surface 232 and the second surface 234 and Tables 4, 5, 6, and 12 are shown in FIG. The angle θ ₁ between the second surface 234 and the third surface 236 is equal to the 90-degree reference luminance value when the prism sheet bef has two sheets (vertical and horizontal), and the first surface It can be seen that as the lengths L ₂ and L ₃ of 132 and the third surface 134 become smaller, the luminance value increases at the 90 ° reference. Particularly, when the length L ₂ of the first surface 232 and the third surface 234 is simulated to 4.7 μm or less, which is a small size of the auxiliary prism 230, the 90 ° reference luminance value increases. .

Next, in the auxiliary prism 230 which doubles the brightness enhancement and the viewing angle improvement to the effect, each of the first surface 232 and the second surface 234 and the second surface 234 and the third surface 236, respectively. When the angle θ ₁ is 156 °, the luminance and the viewing angle will be described. At this time, the first surface 232 and the second surface 234 are oblique.

The auxiliary prism 230 has an angle θ ₁ between the first surface 232 and the second surface 234 and between the second surface 234 and the third surface 236, as shown in FIGS. 13-18. , According to the prism 220 pitch (P) and the length (L ₂ , L ₃ ) of the first surface 232 and the third surface 236 and the second surface 234, divided into large, medium (basic), small can do.

For large sizes, as shown in FIGS. 13 and 14, the angle θ ₁ between the first surface 232 and the second surface 234 and between the second surface 234 and the third surface 236 is increased. For example, when 123 ° and 127 ° are described, first, when the angle θ ₁ is 123 °, the auxiliary prism 230 at the vertex of the prism 220 is shown in FIG. 13B. The distance L ₁ to the starting point of the first surface 232 of the first surface 232 is 7.6 μm, and the first surface 232 and the third surface based on both surfaces 222: L ₁ and L ₄ of the prism 220. The angles θ ₂ , θ ₃ of 236 are 123 °, respectively, and the angle θ between the first surface 232 and the second surface 234 and between the second surface 234 and the third surface 236. ₁ ) are respectively 123 °, and the length L ₂ of the first and third surfaces 232 and 236 are each 10.5 μm, and the length L ₄ from the end point of the third surface 236 to the bottom of the surface 222. ) Is 8.8 μm, and the length L ₃ of the second surface 234 is 7.5 μm.

Next, when the angle θ ₁ is 127 °, the distance L ₁ from the vertex of the prism 220 to the start point of the first surface 232 of the auxiliary prism 230 as shown in FIG. 13B. ) Is 7.6 μm, and the angles θ ₂ , θ ₃ of the first surface 232 and the third surface 236 are 127 based on both surfaces 222 (L ₁ , L ₄ ) of the prism 220, respectively. °, the angle θ ₁ between the first surface 232 and the second surface 234 and the second surface 234 and the third surface 236 are each 127 °, the first and third surfaces 232 , 236), the length (L ₂₎ are each 11.1㎛, a second length (L ₃₎ is 6.9㎛ of surface 234, a second length (L ₃₎ is a specification to 7.5㎛ the second surface 234 of the Decide

For medium sizes, as shown in FIGS. 15 and 16, the angle θ ₁ between the first surface 232 and the second surface 234 and between the second surface 234 and the third surface 236 For example, when the angle is 99 ° and when the angle is 145 °, first, when the angle θ ₁ is 99 °, the auxiliary prism 230 at the vertex of the prism 220 is shown in FIG. 15C. The distance L ₁ to the starting point of the first surface 232 of is 8.8 μm, and the angle of the first surface 232 and the third surface 236 with respect to both surfaces 222 of the prism 220. θ ₂ , θ ₃ are each 99 °, and the angle θ ₁ between the first surface 232 and the second surface 234 and the second surface 234 and the third surface 236 are each 99 °. And the length L ₂ of the first and third surfaces 232 and 236 are respectively 4.5 μm, and the length L ₃ of the second surface 234 is 11.9 μm and at the endpoint of the third surface 236. The length L ₄ to the bottom of surface 222 is specified as 13.3 μm.

Next, when the angle θ ₁ is 145 °, the distance L ₁ from the vertex of the prism 220 to the start point of the first surface 232 of the auxiliary prism 230 as shown in FIG. 15B. ) Is 8.8 μm, and the angles θ ₂ and θ ₃ of the first surface 232 and the third surface 236 are 145 °, respectively, based on both surfaces 222 of the prism 220. The angle θ ₁ between 232 and the second surface 234 and between the second surface 234 and the third surface 236 are 145 °, respectively, and the lengths of the first and third surfaces 232 and 236 ( L ₂ ) are each 7.7 μm, the length L ₃ of the second surface 234 is 5.1 μm, and the length L ₄ from the end point of the third surface 236 to the bottom of the surface 222 is 8.8 μm. Set the specification to.

Finally, for small sizes, the angle θ between the first surface 232 and the second surface 234 and between the second surface 234 and the third surface 236 as shown in FIGS. 17 and 18. For example, when ₁ ) is 99 ° and 145 °, first, when the angle θ ₁ is 99 °, the auxiliary prism at the vertex of the prism 220 as shown in FIG. 17C is shown. The distance L ₁ to the starting point of the first surface 232 of 230 is 15.5 μm, with respect to the first surface 232 and the third surface 236 relative to both surfaces 222 of the prism 220. The angles θ ₂ , θ ₃ are each 99 °, and the angle θ ₁ between the first surface 232 and the second surface 234 and between the second surface 234 and the third surface 236 is 99 ° each, the length L ₂ of the first and third surfaces 232 and 236 are each 3.4 μm, the length L ₃ of the second surface 234 is 10 μm, and the third surface 236 The length (L ₄ ) from the end of to the bottom of surface 222 is specified as 8.8 μm.

Next, when the angle θ ₁ is 145 °, the distance L ₁ from the vertex of the prism 220 to the start point of the first surface 232 of the auxiliary prism 230 as shown in FIG. 17B. ) Is 15.5 μm, and the angles θ ₂ and θ ₃ of the first surface 232 and the third surface 236 are 145 °, respectively, based on both surfaces 222 of the prism 220. The angle θ ₁ between 232 and the second surface 234 and between the second surface 234 and the third surface 236 are 145 °, respectively, and the lengths of the first and third surfaces 232 and 236 ( L ₂ ) are each 5.8 μm, the length L ₃ of the second surface 234 is 1.6 μm, and the length L ₄ from the end point of the third surface 236 to the bottom surface 222 is 8.8 μm. Set the specification to.

Thus, when two sheets (vertical and horizontal) of the prism sheet (bef) is applied and simulated based on the large, medium, and small sizes of the auxiliary prism 230, the angle having a data value equal to or higher than that of the prism film is MAX. It can be seen that it is 145 ° and MIN 99 °. (See FIGS. 14, 16 and 18)

<Example 3>

The optical film 300 according to the present exemplary embodiment includes a body 310, a prism 320, and an auxiliary prism 330 as shown in FIG. 19.

The body 310 is emitted through an upper surface (surface) which is a light exit surface in the process of scattering the incident light and one side wall is a light incident surface, the cold cathode fluorescent lamp which is a light source on one side wall or both side walls of the body 310 A light source (not shown) such as a (CCFL) or a light emitting diode (LED) is installed. In particular, when the light source is a light emitting diode, the light is incident in the form of a dot and emitted in the form of a plane.

The prism 320 is engraved and contiguously arranged in a triangular prism shape at the top of the body 310, and is formed in a number of positions so as to have a set size, bone depth, pitch (P), and outer angle (θ). The light irradiated from (not shown) is collected and finely patterned to improve luminance.

Here, the prism 320 is illustrated as a recess in which both surfaces 322 are symmetrical in this embodiment, and the auxiliary prism 330 is integrally formed on both surfaces 322. At this time, the prism 320 is symmetrical to the left and right, but the bone line is formed in the prism bone, but asymmetrical shape is possible, and the curved surface is formed so as to have a set radius in the prism bone can be changed.

And it is preferable that the prism 320 pitch P is formed in the range of 30-100 micrometers, etc., It is preferable that the internal angle (theta) which is an acid angle is formed in the range of 60-150 degrees.

The secondary prism 330 has a first surface 332 relative to both surfaces 322 of the prism 320 and a second surface connected at different angles to the first surface 332. 334) to form a recessed triangular pillar shape.

In this case, although the first surface 332 and the second surface 334 constituting the auxiliary prism 330 are symmetrical with respect to the surface 322, the left and right asymmetry may be changed. And the angle θ ₁ between the first surface 332 as the horizontal plane and the second surface 334 as the vertical plane is 90 to 156 °.

On the other hand, the distance from the valley line of the prism 320 to the starting point of the first surface 332 of the auxiliary prism 330 is referred to as (L ₁ ), the length of the first surface 332 is referred to as (L ₂ ), The length of the second surface 134 is called L ₃ , and the distance from the end of the second surface 334 to the top of the mountain is called L ₄ .

Hereinafter, in the auxiliary prism 330 which doubles the brightness enhancement and the viewing angle improvement to the effect of the prism 320, two prism sheets bef are applied (vertical and horizontal) and the first surface 332. The luminance and viewing angles along the angle between the second surface 334 and the length of the first surface 332 and the second surface 334 are described.

Here, the auxiliary prism 330 may have an angle θ ₁ between the first surface 332 and the second surface 334, the prism 320 pitch P, and the second as shown in FIGS. 20A, 20B, and 20C. According to the lengths (L ₂ , L ₃ ) of the first surface 332 and the second surface 334, the light may be classified into large, medium (basic), and small. At this time, the angle θ ₁ between the first surface 332 and the second surface 334 illustrates a case of 90 °.

For the large size, the distance L ₁ from the vertex of the prism 320 to the starting point of the first surface 332 of the auxiliary prism 330 is 8.8 μm, and both surfaces ( 322, the angles θ ₂ and θ _{3 of} the first surface 332 and the second surface 334 are 135 °, respectively, and the angle between the first surface 332 and the second surface 334 ( θ ₁ ) is 90 °, the lengths L ₂ , L _{3 of} the first and second surfaces 332, 334 are 12.5 μm, respectively, and the prism 320 pitch P is 12.5 μm. (See Figure 20A)

For the medium size, the distance L ₁ from the vertex of the prism 320 to the start point of the first surface 332 of the auxiliary prism 330 is 13.3 μm, and the two surfaces ( 322, the angles θ ₂ and θ _{3 of} the first surface 332 and the second surface 334 are 135 °, respectively, and the angle between the first surface 332 and the second surface 334 ( θ ₁ ) is 90 °, the lengths L ₂ , L _{3 of} the first and second surfaces 332, 334 are each 6.3 μm, and the prism 320 pitch P is 18.8 μm. (See Figure 20b)

Finally, for the small size, the distance L ₁ from the vertex of the prism 320 to the start point of the first surface 332 of the auxiliary prism 330 is 15.5 μm, and the amount of prism 320 The angles θ ₂ and θ ₃ of the first surface 332 and the second surface 334 relative to the surface 322 are 135 °, respectively, between the first surface 332 and the second surface 334. The angle θ ₁ is 90 °, the lengths L ₂ , L _{3 of} the first and second surfaces 332, 334 are 4.7 μm, respectively, and the prism 320 pitch P is 21.9 μm. . (See Figure 20c)

Thus, when two sheets (vertical, horizontal) of the prism sheet (bef) is applied to simulate the large, medium, and small size of the auxiliary prism 330, the luminance values shown in Table 1 and Tables 2 and 3 You can see the viewing angle.

As a result, the lengths L ₂ and L ₃ of the first surface 332 and the second surface 334 are 12.5 μm, and the first surface 332 and the second surface ( The angle θ ₁ between the 334 and 90 ° reference luminances is equivalent to that of the prism sheet bef having two sheets (vertical and horizontal), and the angles of the first surface 332 and the second surface 334 It can be seen that as the lengths L ₂ and L ₃ become smaller, the 90 ° reference luminance value increases. In particular, when the lengths L ₂ and L _{3 of} the first surface 132 and the second surface 134 are simulated to 4.7 μm or less, which is a small size of the auxiliary prism 330, the 90 ° reference luminance value increases. Able to know.

<Example 4>

The optical film 400 according to the present exemplary embodiment includes a body 410, a prism 420, and an auxiliary prism 430, as shown in FIG. 22.

The body 410 is emitted through an upper surface (surface) which is a light exit surface in the process of scattering the incident light and one side wall is a light incident surface, the cold cathode fluorescent lamp which is a light source on one side wall or both side walls of the body 410 A light source (not shown) such as a (CCFL) or a light emitting diode (LED) is installed. In particular, when the light source is a light emitting diode, the light is incident in the form of a dot and emitted in the form of a plane.

The prisms 420 are intaglio and continuously arranged in a triangular prism shape at the upper end of the body 410, and a plurality of prisms 420 are formed to have a set size, bone depth, pitch (P), and outer angle (θ) to form a light source (Fig. The light irradiated from (not shown) is collected and finely patterned to improve luminance.

Here, the prism 420 is illustrated as a recess in which both surfaces 422 are symmetrical in this embodiment, and the auxiliary prism 430 is integrally formed on both surfaces 422. At this time, the prism 420 is symmetrical while the bone line is formed in the prism bone, but asymmetrical shape is possible, and the curved surface is formed so as to have a set radius in the prism bone can be changed.

And it is preferable that the pitch P of the prism 420 is formed in the range of 30-100 micrometers, etc., It is preferable that the internal angle (theta) which is a mountain angle is formed in the range of 60-150 degrees.

The secondary prism 430 has a first surface 432 relative to both surfaces 422 of the prism 420 and a second surface connected at different angles to the first surface 432. 434 and a third surface 436 connected at different angles to the second surface 434 to form a recessed trapezoidal pillar shape.

In this case, although the first surface 432 and the third surface 436 constituting the auxiliary prism 430 are symmetrical with respect to the surface 422, the left and right asymmetry may be changed. And the horizontal plane of the first surface angle (θ ₁₎ between the portion 432 and the inclined surface of the second surface 434 each (θ ₁₎ and the inclined surface of the second surface 434 and the vertical plane of the third surface 436 between the Is characterized by being 123 to 145 °.

On the other hand, the distance from the valley line of the prism 420 to the starting point of the first surface 432 of the auxiliary prism 430 is referred to as (L ₁ ), the length of the first surface 432 and the third surface 436 The length is referred to as (L ₂ ), the length of the third surface 436 is referred to as (L ₃ ), and the length from the end point of the third surface 436 to the mountain vertex is referred to as (L ₄ ).

Hereinafter, in the auxiliary prism 430 which doubles the brightness enhancement and the viewing angle improvement to the effect of the prism 420, two sheets (vertical and horizontal) of the prism sheet bef are applied, and the first surface 432. And brightness according to the second surface 434 and the angle between the second surface 434 and the third surface 436 and the length of the first surface 432 and the second surface 434 and the third surface 436. And the viewing angle.

Here, the auxiliary prism 430 is an angle between each of the first surface 432 and the second surface 434 and each of the second surface 434 and the third surface 436 as shown in Figs. 23A, 23B, 23C. (θ ₁ ), prism 420 pitch (P) and the length (L ₂ , L ₃ ) of the first surface 432 and the second surface 434 and the third surface 436 large, medium (basic ), Can be classified into cattle. In this case, the angle θ ₁ between the first surface 432 and the second surface 434 and between the second surface 434 and the third surface 436 is 135 °.

For large sizes, the distance L ₁ from the valley line of the prism 420 to the starting point of the first surface 432 of the auxiliary prism 430 is 4.4 μm, and both surfaces 422 of the prism 420 are L _1. , L ₄ ), the angles θ ₂ , θ ₃ of the first surface 432 and the third surface 436 are 135 °, respectively, and the first surface 432, the second surface 434, and The angle θ ₁ between the second surface 434 and the third surface 436 is 135 °, respectively, and the length L ₂ of the first and third surfaces 432 and 436 is 10.9 μm, respectively, and the second surface The length L ₃ of 434 is 11 μm, the length L ₄ from the end of the third surface 436 to the top of the surface 422 is 4.4 μm, and the prism 220 pitch P is 21.9. Specify the specification in μm. (See Figure 23A)

In the case of the medium size, the distance L ₁ from the valley line of the prism 420 to the starting point of the first surface 432 of the auxiliary prism 430 is 8.8 μm, and refers to both surfaces 422 of the prism 420. The angles θ ₂ , θ ₃ of the first surface 432 and the third surface 436 are 135 °, respectively, and the first surface 432, the second surface 434, and the second surface 434 The angle θ ₁ between the third surfaces 436 is 135 °, and the lengths L ₂ of the first and third surfaces 432 and 436 are 6.3 μm, respectively, and the lengths of the second surfaces 434 ( L ₃ ) is 8.8 μm, the length L ₄ from the end of the third surface 436 to the top of the surface 422 is 8.8 μm, and the prism 420 pitch P is 21.9 μm. (See Figure 23B)

Finally, for the small size, the distance L ₁ from the valley line of the prism 420 to the starting point of the first surface 432 of the auxiliary prism 430 is 15.5 μm, and both surfaces 422 of the prism 420 ), The angles θ ₂ , θ ₃ of the first surface 432 and the third surface 436 are 135 °, respectively, and the first surface 432, the second surface 434, and the second surface ( The angle θ ₁ between the 434 and the third surface 436 is 135 °, and the lengths L ₂ of the first and third surfaces 432 and 436 are 4.7 μm, respectively, and the second surface 434. The length L ₃ is 4.4 μm, the length L ₄ from the end point of the third surface 436 to the top surface 422 is 8.8 μm, and the prism 420 pitch P is 12.5 μm. Determine. (See Figure 23C)

Thus, when two sheets (vertical and horizontal) of the prism sheet (bef) is applied and simulated based on the large, medium and small sizes of the auxiliary prism 430, the luminance values shown in Table 10 and Tables 11 and 12 You can see the viewing angle.

As a result, when the length L ₂ of the first surface 432 and the third surface 436 is 12.5 μm through Tables 10, 11, 12, and FIG. 24, the 90 ° reference luminance value is 2 in the prism sheet bef. It is equivalent to the case of long (vertical, horizontal), and the 90 ° reference luminance value increases as the lengths L ₂ and L _{3 of} the first surface 132 and the third surface 134 become smaller. have. Particularly, when the length L ₂ of the first surface 332 and the third surface 334 is simulated to 4.7 μm or less, which is a small size of the auxiliary prism 330, the reference luminance value of 90 ° may increase. .

In the detailed description of the present invention described above with reference to the preferred embodiment of the present invention, the scope of protection of the present invention is not limited to the above embodiment, and those skilled in the art of the present invention It will be understood that various modifications and changes can be made in the present invention without departing from the spirit and scope of the invention.

1 is a view showing an optical film according to a first embodiment of the present invention.

FIG. 2 is an enlarged view showing a state in which the auxiliary prism size of the optical film is divided into small, medium and small.

3 is a graph showing luminance and viewing angles when the auxiliary prism size and the prism sheet are two sheets.

4 is a schematic diagram showing an angle change of a large size among the auxiliary prism sizes.

FIG. 5 is a graph illustrating luminance and viewing angle according to the size of the auxiliary prism in FIG. 4.

Fig. 6 is a schematic diagram showing an angle change of a medium size among the auxiliary prism sizes.

FIG. 7 is a graph illustrating luminance and viewing angle according to the size of the auxiliary prism in FIG. 6.

Fig. 8 is a schematic diagram showing an angle change of a small size among the auxiliary prism sizes.

FIG. 9 is a graph illustrating luminance and viewing angle according to the size of the auxiliary prism in FIG. 8.

10 is a view showing an optical film according to a second embodiment of the present invention.

FIG. 11 is an enlarged view showing a state in which the auxiliary prism size of the optical film is divided into small, medium and small.

12 is a graph showing luminance and viewing angles when the auxiliary prism size and the prism sheet are two sheets.

Fig. 13 is a schematic diagram showing an angle change of a large size of the auxiliary prism sizes.

FIG. 14 is a graph illustrating luminance and viewing angle according to the size of the auxiliary prism in FIG. 13.

Fig. 15 is a schematic diagram showing an angle change of a medium size among the auxiliary prism sizes.

FIG. 16 is a graph illustrating luminance and viewing angle according to the size of the auxiliary prism in FIG. 15.

Fig. 17 is a schematic diagram showing an angle change of a small size among the auxiliary prism sizes.

FIG. 18 is a graph illustrating luminance and viewing angle according to the size of the auxiliary prism in FIG. 17.

19 is a view showing an optical film according to a third embodiment of the present invention.

FIG. 20 is an enlarged view showing a state in which the auxiliary prism size of the optical film is divided into small, medium and small.

FIG. 21 is a graph showing luminance and viewing angle when the auxiliary prism size and the prism sheet are two sheets.

22 is a view showing an optical film according to a fourth embodiment of the present invention.

FIG. 23 is an enlarged view showing the state divided by the medium, the small, and the auxiliary prism size of the optical film.

FIG. 24 is a graph showing luminance and viewing angles when the auxiliary prism size and the prism sheet are two sheets.

<Description of Symbols for Main Parts of Drawings>

100: optical film 110 of the first embodiment: body

120: prism 122: surface

130: auxiliary prism 132: first surface

134: second surface

200: optical film 210 of the second embodiment: body

220: prism 222: surface

230: auxiliary prism 232: first surface

234: second surface 236: third surface

300: optical film 310 of the third embodiment: body

320: prism 322: surface

330: auxiliary prism 332: first surface

334: second surface

400: optical film 410 of a fourth embodiment

420: prism 422: surface

430: auxiliary prism 432: first surface

434: second surface 436: third surface

Claims (5)

A prism pattern that is embossed or engraved and continuously arranged in a triangular prism shape; An auxiliary prism integrally formed on both surfaces of the prism pattern, the auxiliary prism including a second surface connected to the first surface at an angle of 90 to 156 ° to the first surface, The lengths L ₂ and L ₃ of the first and second surfaces are 4.5 to 12.5 μm, The angle between both surfaces of the prism pattern is 60-150 °, The pitch of the said prism pattern is 30-100 micrometers, The optical film characterized by the above-mentioned. A prism pattern that is embossed or engraved and continuously arranged in a triangular prism shape; It is integrally formed on both surfaces of the prism pattern, the second surface is connected to the first surface and the first surface at an angle of 123 to 145 ° and connected to the second surface at an angle of 123 to 145 °. An auxiliary prism comprising a third surface, wherein The length L ₂ of the first and third surfaces is 4.5 to 12.5 μm, and the length L ₃ of the second surface is 1.6 to 10.9 μm, The angle between both surfaces of the prism pattern is 60-150 °, The pitch of the said prism pattern is 30-100 micrometers, The optical film characterized by the above-mentioned. The method according to claim 1 or 2, The prism pattern is an optical film, characterized in that both surfaces are symmetrical or asymmetrical. The method according to claim 1 or 2, The auxiliary prism is characterized in that the left and right symmetrical or asymmetrical optical film. The method according to claim 1 or 2, The vertex or valley line of the auxiliary prism is a round film is formed.

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