KR20150051258A - Optical film, light source assembly and liquid crystal display including the same, and pattern mold for fabricating the optical film - Google Patents

Abstract

An optical sheet, a light source assembly and a liquid crystal display including the same, and a pattern mold for fabricating the optical sheet are provided. The optical sheet comprises: a first film; a first optical modulation layer formed on the upper part of the first film; a second film; a second optical modulation layer formed on the upper part of the second film; and a bonding layer formed on the lower part of the second film, bonded with at least some parts of the first optical modulation layer penetrated. The first optical modulation layer includes multiple prism units prolonged in one direction and an upper wave pattern unit connected to each prism unit, and a height for the top of upper wave pattern unit changes in the prolonged direction of the prism unit.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical sheet, a light source assembly including the same, a liquid crystal display device, and a method of manufacturing a pattern mold for manufacturing an optical sheet,

The present invention relates to an optical sheet, a light source assembly and a liquid crystal display including the same, and a manufacturing method of a pattern mold for manufacturing an optical sheet.

A liquid crystal display (LCD) is a device for displaying an image by injecting liquid crystal between two glass plates and applying power to the upper and lower glass plate electrodes to change the arrangement of liquid crystal molecules in each pixel. Unlike a cathode ray tube (CRT), a plasma display panel (PDP) or the like, a display using a liquid crystal display device is not usable in a place where there is no light because the display itself is non-luminous. In order to compensate for these drawbacks, a light source assembly that is uniformly irradiated on the information display surface is mounted for the purpose of enabling use in a dark place.

The light source assembly used in the liquid crystal display device is divided into two types. The first is an edge type light source assembly that provides light at the side of the liquid crystal display device, and the second is a direct light type light source assembly that provides light directly at the rear side of the liquid crystal display device. In some edge type light source assemblies, a light guide plate is provided so that light emitted from a light source is irradiated upward, and at least one optical sheet is provided above the light guide plate to control optical characteristics of light passing through the light guide plate. In the case of some direct type light source assemblies, a diffusion plate is provided to reduce the light lines of light emitted from the light source, and at least one optical sheet is provided to control the optical characteristics of light passing through the diffusion plate.

In the light source assembly, a plurality of optically functional optical sheets are required for light shielding and precise optical property control. However, if the number of optical sheets is increased, the thickness of the light source assembly is increased and the manufacturing cost is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical sheet in which a plurality of optical modulation characteristics are effectively realized, brightness is improved, and bonding force is improved.

Another object of the present invention is to provide a light source assembly having a reduced thickness and mechanical stability and brightness.

Another object of the present invention is to provide a liquid crystal display device in which the thickness is thin and the mechanical stability and brightness are directed.

It is another object of the present invention to provide a method of manufacturing a pattern mold used for manufacturing an optical sheet as described above.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided an optical sheet comprising a first substrate, a first optical modulation layer formed on the first substrate, a second substrate, a second optical modulation And a bonding layer formed on the lower surface of the second substrate and bonded by at least partially penetrating the first optical modulation layer, wherein the first optical modulation layer includes a plurality of prism portions extending in one direction, And an upper wave pattern portion connected to each of the prism portions, wherein a top height of the upper wave pattern portion varies along the extending direction of the prism portion.

According to another aspect of the present invention, there is provided a light source assembly including the optical sheet as described above.

According to another aspect of the present invention, there is provided a liquid crystal display device including the optical sheet as described above.

According to another aspect of the present invention, there is provided a method of manufacturing a pattern mold, the method comprising: preparing a cylindrical mold and a bite having a depressed prism pattern line formed on a surface thereof; And cutting the cylindrical mold by entering the bite while adjusting the entry depth of the bite into the crest portion of the intaglio prism pattern.

The details of other embodiments are included in the detailed description and drawings.

The embodiments of the present invention have at least the following effects.

That is, according to the optical sheet according to the embodiments of the present invention, excellent stability of the apparatus and high luminance characteristics can be exhibited only by using a single optical sheet.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a perspective view of an optical sheet according to an embodiment of the present invention.
2 is a perspective view of the first optical modulation layer of Fig.
3 is a cross-sectional view taken along line III-III 'of FIG.
4 is a cross-sectional view taken along line IV-IV 'of FIG.
5 is a cross-sectional view of the prism portion in the width direction passing through the points H1 to H5 in FIG. 2 in the horizontal direction.
Fig. 6 is a cross-sectional view of the cross section of the prism portion in the width direction passing through H1 to H5 in Fig.
7A-7C are cross-sectional views illustrating the combination of a prism layer and a bonding layer in accordance with various embodiments of the present invention.
8 is a cross-sectional view of a first light modulating layer of an optical sheet according to another embodiment of the present invention.
9 is a sectional view of a first light modulating layer of an optical sheet according to another embodiment of the present invention.
10 and 11 are perspective views for explaining a method of manufacturing a pattern mold according to an embodiment of the present invention.
12 is a cross-sectional view for explaining a method of manufacturing a pattern mold.
13 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

It is to be understood that elements or layers are referred to as being "on " other elements or layers, including both intervening layers or other elements directly on or in between. On the other hand, a device being referred to as "directly on" refers to not intervening another device or layer in the middle. Like reference numerals refer to like elements throughout the specification. "And / or" include each and any combination of one or more of the mentioned items.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms " comprises "and / or" comprising "used in the specification do not exclude the presence or addition of one or more other elements in addition to the stated element.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" And can be used to easily describe a correlation between an element and other elements. Spatially relative terms should be understood in terms of the directions shown in the drawings, including the different directions of components at the time of use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

As used herein, the term "film" can be used in the sense of "to sheet"

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view of an optical sheet according to an embodiment of the present invention. 2 is a perspective view of the first optical modulation layer of Fig.

1 and 2, an optical sheet 200 according to an embodiment of the present invention includes a first substrate 211, a first optical modulation layer formed on the first substrate 211, a second substrate 235 A bonding layer 240 formed on the lower surface of the second substrate 235, and a second light-modulating layer formed on the upper surface of the second substrate 235.

The first substrate 211 and the second substrate 235 may be made of a material capable of transmitting light. For example, each of the substrates 211 and 215 may be formed of a material selected from the group consisting of a polycarbonate series, a poly sulfone series, a poly acrylate series, a polystyrene series, a poly vinyl (vinyl) a polyvinyl alcohol series, a poly norbornene series, and a polyester ester series may be included.

The first substrate 211 and the second substrate 235 may each have a thickness of 10 to 300 mu m or may have a thickness of 25 to 250 mu m. In an exemplary embodiment, each of the first substrate 211 and the second substrate 235 may be 50 占 퐉, 75 占 퐉, 125 占 퐉, or 250 占 퐉.

A back coating layer 220 may be formed on the lower surface of the first substrate 211. The back coating layer 220 is located at the lowermost portion of the optical sheet 200. The back coating layer 220 may have a predetermined surface roughness.

A first optical modulation layer is formed on the upper surface of the first substrate 211, and a second optical modulation layer is formed on the upper surface of the second substrate 235. The first optical modulation layer and the second optical modulation layer may each be an optical layer for modulating optical characteristics. For optical property modulation, the first optical modulation layer and the second optical modulation layer may comprise a light modulation pattern. The light modulation pattern has a non-planar surface and may include recesses and protrusions.

In an exemplary embodiment, the first optical modulation layer and the second optical modulation layer may be a diffusion pattern layer, a micro lens pattern layer, a prism pattern layer, or a lenticular layer, respectively, but are not limited thereto. 1 and 2 illustrate a case where a prism layer 230 is used as a first optical modulation layer and a microlens layer 250 is used as a second optical modulation layer. As described above, when two or more optical modulation layers are formed in an integrally coupled optical sheet, various optical modulation can be performed.

The prism layer 230 includes a plurality of prism portions 231 and a top wave pattern portion 232 formed on the prism portion 231. Each of the prism portions 231 extends in the first direction X1. The upper wave pattern part 232 may have a wave pattern whose height is changed along the first direction X1 which is the extending direction of the prism part 231. [

The prism portion 231 and the upper wave pattern portion 232 may be made of the same material or may be integrally formed. The prism layer 230 may be made of, for example, a thermosetting resin or an ultraviolet ray curing resin. Examples of the thermosetting resin include an acrylic resin, a urethane resin, and a polyester resin. Examples of the ultraviolet ray curable resin include an epoxy acrylate resin, a urethane acrylate resin, and a silicone acrylate resin. The refractive index of the prism layer 230 may be about 1.48 to 1.60, or about 1.53 to 1.58, but is not limited thereto.

A more detailed description of the prism layer 230 will be described later.

A bonding layer 240 is formed on the lower surface of the second substrate 235. The bonding layer 240 may be composed of an adhesive layer, a pressure-sensitive adhesive layer, or other resin layer. For example, the bonding layer 240 may be formed of a composition containing an epoxy acrylate resin, a urethane acrylate resin or the like, or a composition containing a polyether polyol, a polyester polyol, a polycarbonate polyol, or a polybutadiene glycol And a composition comprising a polyol material. The refractive index of the bonding layer 240 may be between about 1.46 and 1.60, or between about 1.48 and 1.54. The refractive index of the bonding layer 240 may be smaller than the refractive index of the prism layer 230, but is not limited thereto. The thickness of the bonding layer 240 may be about 1 to 10 mu m, but is not limited thereto.

In the bonding layer 240, the upper wave pattern portion 232 of the prism layer 230 is at least partly penetrated and bonded. This will be described in more detail later.

A microlens layer 250 is formed on the upper surface of the second substrate 235. The microlens layer 250 includes a plurality of microlenses 251. Each microlens 251 may be arranged in a matrix. That is, each microlens 251 may be arranged along the third direction and the fourth direction. Each microlens 251 may include a plurality of rows arranged in the third direction and a plurality of rows arranged in the fourth direction. Each of the microlenses 251 in the neighboring rows may be staggered. That is, the microlenses 251 in the even-numbered rows adjacent to the microlenses 251 in the odd-numbered rows can be arranged between the microlenses 251 in the odd-numbered rows. The line connecting the centers of two microlenses 251 adjacent to each other in the nth row and one microlens 251 in the (n + 1) th row adjacent thereto may be a substantially isosceles triangle or an equilateral triangle.

In an exemplary embodiment, the third direction may be the same as the first direction X1, which is the direction in which the prism portion 231 extends. Also, the fourth direction may intersect the third direction. For example, the crossing angle in the third direction may be 90 degrees in the fourth direction.

In another embodiment, the crossing angle between the first direction X1 and the third direction may be between -45 and 45, and the crossing angle between the third direction and the fourth direction may be between -60 and 60, It is needless to say that the present invention is not limited to the above examples. In some other embodiments, the microlenses 251 may not be arranged in a matrix, but may be randomly arranged.

Each of the microlenses 251 may be a shape of a structure remaining after cutting a spherical or ellipsoid into one plane. For example, each microlens 251 may be hemispherical, semi-ellipsoidal in shape. In addition, each microlens 251 may have a polygonal shape such as a hexagonal bottom surface, a curved surface as it goes up, and a top as a part of a spherical shape.

The width (diameter or the maximum width of the lower end) of each microlens 251 may be about 20 um to 100 um. The width of each microlens 251 may be smaller than the width of the prism portion 231, but is not limited thereto. The height of each microlens 251 may be about 5 um to 50 um.

The microlens layer 250 may be made of a thermosetting resin or an ultraviolet ray hardening resin similarly to the prism layer 230. Examples of the thermosetting resin include an acrylic resin, a urethane resin, and a polyester resin. Examples of the ultraviolet ray curable resin include an epoxy acrylate resin, a urethane acrylate resin, and a silicone acrylate resin. The refractive index of the microlens layer 250 may be about 1.43 to 1.60, or about 1.45 to 1.55, but is not limited thereto.

Hereinafter, the prism layer 230 will be described in detail. 3 is a cross-sectional view taken along line IIIa-IIIa 'of FIG. 4 is a cross-sectional view taken along line IV-IV 'of FIG.

Referring to FIGS. 1 to 4, each of the prism portions 231 may include a prism inclined surface 235. The prism inclination angles? 1 and? 2 of the prism inclined plane 235 may be about 35 to 65 degrees or about 40 to 50 degrees. In some embodiments, the prism inclination angles? 1,? 2 may be about 45 degrees. The upper end 235a of the prism inclined surface 235 can be in contact with the upper wave pattern portion 232. [ The prism valley portions P1 and P2 may be formed between the neighboring prism portions 230 and the lower end of the prism inclined surface 235 may be located at the prism valley portions P1 and P2.

The width w of the prism portion 231 can be maximized between the prism valley portions P1 and P2. The width w of the prism portion 231 may be defined as the distance between the prism valley portions P1 and P2 unless otherwise stated herein. The width w of the plurality of prism portions 231 may be substantially equal to each other. The width direction of the prism portion 231 (hereinafter referred to as the second direction X2) may be perpendicular to the extending direction of the prism portion.

A relaxation layer 236 may be further formed under the prism valley portions P1 and P2. The mitigating layer 236 may connect the neighboring prism portions 230 integrally. The thickness of the relaxed layer 236 may be from about 1 to about 10 um, but is not limited thereto. The heights of the prism valleys P1 and P2 from the first base plate 211 may be substantially the same. The relaxed layer 236 may be omitted.

The upper end 235a of the prism inclined surface 235 may extend to the upper wave pattern portion 232 but may intersect when the prism inclined surface 235 located on both sides of the prism portion 230 is further extended. The intersection point P3 and the two prism valleys P1 and P2 on the sectional view can define a virtual triangle. In the imaginary triangle, the internal angle of the intersection CP may be about 70 to 110 degrees, or about 80 to 100 degrees. The sides of the triangle passing through the intersection CP and located on both sides of the straight line 1 perpendicular to the first substrate 211 (i.e., the prism inclined surface 235) may be line-symmetric.

In some embodiments, the hypothetical triangle may be a right-angled isosceles triangle with an angle at the intersection CP of 90 degrees. In this case, the prism inclination angles? 1 and? 2 will be 45 degrees.

The virtual triangles may be respectively defined in the plurality of prism portions 230, and the intersections CP of the respective triangles may be identical to each other. Further, in the plurality of prism portions 230, each of the hypothetical triangles may have the same shape and size. This means that the pitches and shapes of the prism portions 231 except for the upper wave pattern portion 232 are substantially the same.

An upper wave pattern portion 232 is formed on the upper portion of the prism portion 231. The virtual intersection points CP formed by the extension lines 11 and 12 of the prism inclined surface 231 may be all located within the upper wave pattern portion 232. In this case,

The height of the upper ends H1 to H5 of the upper wave pattern portion 232 may vary along the first direction X1. The upper wave pattern portion 232 may include a high point portion 232h and a low point portion 232l. The high point portion 232h refers to a point or section with the highest height around the point along the first direction X1 and the low point portion 232l refers to the point along the first direction X1 about the point May refer to a point or section having the lowest height.

Each of the upper wave pattern portions 232 located on the respective prism portions 230 may include a plurality of high point portions 232h (a floor or a mountain portion) and a low point portion 232l (a valley). The respective peak portions 232h are spaced apart from each other, and the respective low point portions 232l can be spaced apart from each other. Each low-point portion 232l may be disposed between each high-point portion 232h.

The height of the upper ends H1 to H5 of the upper wave pattern portion 232 gradually increases along the first direction X1 from the low point portion 232l and gradually decreases as the height of the upper wave pattern portion 232 passes the high point portion 232h. The inclined surface between the low point portion 232l and the high point portion 232h may have a curved surface. In the exemplary embodiment, the inclined surface around the high point portion 232h formed along the first direction X1 in the upper wave pattern portion 232 has an upwardly convexly inclined surface, and the inclined surface around the low point portion 232l is convex downward It may have an inclined surface. The upper (H1-H5) profile of the upper wave pattern portion 232 has regularity along the first direction X1 and can be changed, but is not limited thereto.

The upper wave pattern portion 252 along the section cut in the second direction X2 that is the width w of the prism portion 230 may have a shape that becomes narrower from the bottom to the top. That is, the upper wave pattern portion 252 may be inclined downward toward the both sides about the upper ends H1-H5. The inclined surfaces on both downward inclined sides may have convex curved surfaces, but are not limited thereto. For example, the inclined surfaces on both downward inclined sides may be formed in a plane.

The upper ends H1-H5 of the upper wave pattern portion 252 may be positioned so as to overlap the intersections CP of the virtual triangles described above. That is, the upper ends H1-H5 of the upper wave pattern portion 252 can pass through the imaginary triangular intersection CP and the straight line 13 perpendicular to the first base 211.

5 is a cross-sectional view of the prism portion in the width direction passing through the points H1 to H5 in FIG. 2 in the horizontal direction. Fig. 6 is a cross-sectional view of the cross section of the prism portion in the width direction passing through H1 to H5 in Fig.

5 and 6, the maximum width (mw1-mw5) of the upper wave pattern portion 232 may be correlated with the height of the upper wave pattern portion 232. [ That is, as the height of the upper wave pattern part 232 is higher, the width of the upper wave pattern part 232 may be larger. However, this correlation is not limited to a linear proportional relationship. The widths mw1-mw5 may be the same regardless of the height of the upper wave pattern portion 232 or the height and widths mw1-mw5 of the upper wave pattern portion 232 may be in inverse proportion to each other.

The higher the height of the upper ends H1-H5 of the upper wave pattern portion 232, the greater the thickness t1-t5 of the upper wave pattern portion 232 itself. The position of the lower end of the upper wave pattern portion 232 may be lowered from the low point portion 232l to the highest point portion 232h along the first direction X1. Accordingly, the area of the prism inclined surface 235 or the sectional length thereof can be made smaller from the low point portion 232l to the high point portion 232h. However, the present invention is not limited to this, and the position of the lower end of the upper wave pattern part 232 may be parallel to the first base material 212, or may be higher toward the highest point 232h.

The maximum width mw1-mw5 of the upper wave pattern portion 232 may be 1 um to 5 um at the low point 232l and 1 um to 10 um at the high point 232h. The thickness t1-t5 of the upper wave pattern portion 232 may be 0.5 um to 5 um at the low point 232l and 3 um to 10 um at the high point 232h.

7A-7C are cross-sectional views illustrating the combination of a prism layer and a bonding layer in accordance with various embodiments of the present invention.

Referring to FIGS. 7A to 7C, the upper wave pattern portion 232 of the prism layer 230 is at least partly penetrated and bonded to the bonding layer 240. The bonding layer 240 may have a uniform thickness.

7A illustrates a case where all of the upper wave pattern portions 232 of the prism layer can penetrate into the bonding layer 240. FIG. The upper end H3 of the upper wave pattern portion 232 at the highest point 232h may contact the lower surface of the second substrate 212 but may penetrate only to a certain extent as shown in FIG. The prism inclined surface 235 of the prism portion 231 may not penetrate into the bonding layer 240 although the entire upper wave pattern portion 232 penetrates into the bonding layer 240 in the high point portion 232h . In the case of the low point portion 232l, not only the upper wave pattern portion 232 but also the prism inclined surface 235 of the prism portion 231 can penetrate partly into the bonding layer 240.

In another embodiment, the prism layer 230 is further penetrated more generally so that not only the upper wave pattern portion 232 but also the prism inclined surface 235 of the prism portion 231, in the high point portion 232h, .

7B illustrates a case where a part of the upper wave pattern portion 232 of the prism layer 230 partially penetrates into the bonding layer 240. FIG. That is, in the high point portion 232h, only the upper portion of the upper wave pattern portion 232 penetrates into the bonding layer 240, and the lower portion of the upper wave pattern portion 232 does not penetrate into the bonding layer 240. In the case of the low point portion 232l, the entire upper wave pattern portion 232 may be penetrated into the bonding layer 240 as shown by a solid line on the surface of the bonding layer 240, A portion of the upper portion of the low point 232L prism inclined surface 235 may be penetrated into the bonding layer 240 as shown by the broken line in the lower surface of the bonding layer 240. As shown by the upper dotted line, A part of the upper wave pattern portion 232 of the portion 232l may not penetrate into the bonding layer 240. [

7C illustrates a case where a part of the upper wave pattern part 232 of the prism layer 230 partially penetrates the bonding layer 240, but a part of the upper wave pattern part 232 does not penetrate at all. That is, at least the upper portion of the upper wave pattern portion 232 penetrates into the bonding layer 240 at the high point portion 232h while the upper wave pattern portion 232 penetrates the bonding layer 240 ).

As the prism layer 230 penetrates much into the bonding layer 240, the bonding force between the prism layer 230 and the bonding layer 240 increases. On the other hand, the brightness increases as the total area of the portion of the prism inclined surface 235 that does not penetrate the bonding layer 240 becomes larger.

7A to 7C, the high point portion 232h of the upper wave pattern portion 232 penetrates deeply into the bonding layer 240 relatively, and thus has a high bonding force at this portion. The high point portions 232h are periodically and repeatedly arranged along the first direction X1, which means that the portions with high bonding strength are periodically repeatedly arranged. Therefore, stability of the mechanism against external force can be achieved. In addition, since the thickness t1-t5 of the upper wave pattern portion 232 gradually changes from the low point portion 232l to the high point portion 232h, the penetration depth also gradually changes. Accordingly, the dispersion and concentration of the external force can be effectively performed.

In the case of the low point portion 232l, a relatively wider inclined surface is included, and a depth at which the inclined surface is penetrated is also relatively small, so that the luminance of the optical sheet 200 is improved overall Lt; / RTI >

8 is a cross-sectional view of a first optical modulation layer of an optical sheet according to another embodiment of the present invention, which is contrasted with the cross-sectional shape of Fig. Referring to FIG. 8, the optical sheet according to the present embodiment is different from the embodiment of FIG. 4 in that the low point portions 2321l of the upper wave pattern portion 2321 include a flat section. In addition, except for the flat section, the section from the high point portion 2321h to the low point portion 2321l may have a convex curved surface. The section may be a parabola or part of a circle or semicircle.

9 is a cross-sectional view of a first optical modulation layer of an optical sheet according to another embodiment of the present invention, which is contrasted with the cross-sectional shape of Fig. Referring to FIG. 9, the optical sheet according to the present embodiment illustrates a case where the thickness of the low point portion 2322l of the upper wave pattern portion 2322 is zero. That is, at the low point portion 2322l, only the prism portion 231 may be formed without the upper wave pattern portion 2322 in the prism layer. In this region, the prism portion 231 can be formed and exposed. A region from the highest point 2322h to the low-point portion 2322l with a thickness of 0 is substantially the same as that in FIG. 8, and thus a duplicate description will be omitted.

10 and 11 are perspective views for explaining a method of manufacturing a pattern mold according to an embodiment of the present invention. 12 is a cross-sectional view for explaining a method of manufacturing a pattern mold.

Referring to FIG. 10, a cylindrical mold 310 is prepared and a plurality of intaglio prism pattern lines 312 are formed on the surface.

Referring to FIGS. 11 and 12, the cylindrical mold 310 is further cut to prepare a bite 320 for forming a wave pattern. The byte 320 may be applied such that the tip is relatively pointed and the width becomes wider toward the lower end. Thereafter, while the cylindrical mold 310 is relatively rotated with respect to the bite 320, the bite 320 is introduced into the crest of the intaglio prism pattern 312 and the crest of the intaglio prism pattern 312 is adjusted She carves. Here, the relative rotation of the cylindrical mold 310 with respect to the bite 320 means that the position of the bite 320 is fixed and the cylindrical mold 310 is rotated or the cylindrical mold 310 is fixed and the bite 320 may be rotated along the outer periphery of the cylindrical mold 310. The cylindrical mold 310 may be machined vertically as shown in Fig. 11, but it may be machined horizontally as shown in Fig.

When the bite 310 enters deeply, it is further shaved from the peak of the engraved prism pattern 310. By using the bite 320, which has a wider width toward the lower end, the width of the bite can also be enlarged correspondingly. Accordingly, the engraved pattern 314 corresponding to the high point portion of the upper wave pattern portion can be formed. When the entry depth of the bite 320 is small, the amount to be cut by the cylindrical mold 310 is also reduced. The engraved pattern 314 corresponding to the low point of the upper wave pattern can be formed. The entry depth adjustment of the byte 320 may be periodic. For example, the byte 320 can be vibrated in a depth direction in a certain period. Accordingly, periodic high-point and low-point engraved patterns 314 can be formed. The depth and / or width of gradual shaving between the high and low points will be reduced.

The method of forming a wave pattern as described above allows a chip to be ejected easily because the bite 320 is inserted into the cylindrical mold 310 and then exits again.

The optical sheets described above can be employed in a light source assembly or a liquid crystal display including the same, and can be used to enhance light efficiency. The light source assembly is classified into a direct light source assembly in which the lamp is located at the bottom, an edge light source assembly in which the lamp is located at the side, and the like. The optical sheet according to the embodiments of the present invention can be applied to any kind of light source assembly. It is also applicable to a back light assembly disposed below the liquid crystal panel or a front light assembly disposed above the liquid crystal panel. Hereinafter, as an example of various applications, an optical sheet according to the embodiment of FIG. 3 is applied to a liquid crystal display including an edge light source assembly.

13 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.

13, the liquid crystal display 700 includes a light source assembly 400, and a liquid crystal panel assembly 500.

The light source assembly 400 includes a light source 410, a light guide plate 420 for guiding light emitted from the light source 410, a reflection film 315 disposed below the light guide plate 420, And an optical sheet 200 arranged to modulate the optical characteristics of the emitted light.

The light source 410 is disposed on both sides of the light guide plate 420. The light source 410 may be a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), or an external electro fluorescent lamp (EEFL). In another embodiment, the light source 410 may be disposed only on one side of the light guide plate 420.

The light guide plate 420 moves the light emitted from the light source 410 through the total internal reflection and emits the light upward through a scattering pattern or the like formed on the lower surface of the light guide plate 420. A reflective film 415 is disposed under the light guide plate 420 to reflect the light emitted downward from the light guide plate 420 to the upper side.

An optical sheet 10 is disposed on an upper portion of the light guide plate 420. Since the optical sheet 200 has been described in detail in the foregoing, a duplicate description will be omitted. Other optical sheets may be disposed above or below the optical sheet 200. [ For example, a diffusion film for diffusing incident light, a prism sheet for condensing incident light, a liquid crystal film for partially reflecting the incident circularly polarized light, a retardation film for converting circularly polarized light into linearly polarized light, a reflective polarizing film, / Or a protective film may be further provided.

The light source 410, the light guide plate 420, the reflective film 415, and the optical sheet 200 may be received by the bottom chassis 440.

The liquid crystal panel assembly 500 includes a first display panel 511, a second display panel 235 and a liquid crystal layer (not shown) interposed therebetween. The liquid crystal panel assembly 500 includes a first display panel 411 and a second display panel 412 And a polarizing plate (not shown) attached to the surface of the polarizing plate.

The liquid crystal display 700 may further include a top chassis 500 covering the sides of the liquid crystal panel assembly 500 and the light source assembly 300 to cover the edges of the liquid crystal panel assembly 500.

The light source assembly described above can effectively exhibit a plurality of light modulation characteristics and improve brightness by using an optical sheet according to one embodiment of the present invention, even if a relatively small number of substrates are used. Therefore, the thickness of the light source assembly can be reduced, and the assembling process can be simplified. Accordingly, the image quality of a liquid crystal display including such a light source assembly can be improved.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

200: Optical sheet
211: first substrate
212: second substrate
230 prism layer
231:
232: upper wave pattern portion
250: Micro lens layer

Claims (17)

A first substrate;
A first light modulating layer formed on the upper surface of the first substrate;
A second substrate;
A second light modulating layer formed on an upper surface of the second substrate; And
And a bonding layer formed on a lower surface of the second substrate and bonded by at least partially penetrating the first optical modulation layer,
Wherein the first optical modulation layer includes a plurality of prism portions extending in one direction and an upper wave pattern portion connected to the respective prism portions,
Wherein an upper height of the upper wave pattern portion varies along the extending direction of the prism portion. The method according to claim 1,
Wherein the upper wave pattern portion comprises mutually spaced high and low point portions. 3. The method of claim 2,
Wherein each of the high point portion and the low point portion is plural, and each of the high point portion and each low point portion is alternately arranged. The method of claim 3,
And between the high point portion and the low point portion is inclined to a curved surface. 3. The method of claim 2,
And the thickness of the upper wave pattern portion at the high point portion is larger than the thickness of the upper wave pattern portion at the low point portion. 6. The method of claim 5,
Wherein a maximum width of the upper wave pattern portion at the high point portion is larger than a maximum width of the upper wave pattern portion at the low point portion. 6. The method of claim 5,
And an area of an inclined plane of the prism of the prism portion is wider at the low point portion than the high point portion. 3. The method of claim 2,
Wherein the thickness of the low point portion is zero. 3. The method of claim 2,
Wherein the upper wave pattern portion penetrates into the bonding layer. 3. The method of claim 2,
Wherein the upper portion of the upper wave pattern portion penetrates only the upper portion into the bonding layer and the lower portion does not penetrate into the bonding layer. 3. The method of claim 2,
Wherein at least an upper portion of the upper wave pattern portion penetrates into the bonding layer and a lower portion of the upper wave pattern portion does not penetrate into the bonding layer. The method according to claim 1,
Wherein a cross section of the upper wave pattern portion in the width direction of the prism portion has a smaller width as it goes from the lower side to the upper side. The method according to claim 1,
And the pitch and the shape of each of the prism portions are substantially equal to each other. A light source assembly comprising an optical sheet according to any one of claims 1 to 13. A liquid crystal display device comprising the optical sheet according to any one of claims 1 to 13. Preparing a cylindrical mold and a bite having a recessed prism pattern line formed on a surface thereof; And
And rotating the cylindrical mold relative to the base to relatively cut the cylindrical mold while entering the bite while adjusting the depth of entry of the bite into the apex of the recessed prism pattern. 17. The method of claim 16,
Wherein adjusting the entry depth of the bite includes periodically vibrating the bite in a depth direction.

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