KR100936714B1 - Optical sheet and Method of Manufacturing the same and Liquid Crystal Display using the same - Google Patents

Abstract

The present invention, the base film having a thickness of 20㎛ to 1000㎛; A first protrusion located on one surface of the base film; A second protrusion positioned on the other surface of the base film and including a concave portion and a convex portion; And a reflector positioned in the recess of the second protrusion, wherein the recess is located corresponding to the area in which the valley of the first protrusion is formed, and the first protrusion includes a floor and a valley and includes a plurality of beads therein. The reflector provides an optical sheet comprising any one of titanium dioxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium sulfate, barium carbonate, zinc oxide, magnesium hydroxide, calcium hydroxide, or talc.

Optical Sheet, Reflector, Liquid Crystal Display

Description

Optical sheet and method of manufacturing the same and Liquid Crystal Display using the same}

The present invention relates to an optical sheet, a manufacturing method thereof, and a liquid crystal display device using the same.

With the development of information technology, the market for a display device, which is a connection medium between a user and information, is growing. Accordingly, flat panel displays (FPDs) such as liquid crystal displays (LCDs), organic light emitting diodes (OLEDs), and plasma display panels (PDPs) may be used. Usage is increasing. Among them, a liquid crystal display capable of realizing high resolution and capable of miniaturization as well as a large size is widely used.

Here, the liquid crystal display device is classified into a light receiving display device. Such a liquid crystal display may display an image by receiving a light source from a backlight unit disposed under the liquid crystal panel.

The backlight unit may include a light source and an optical film layer to provide efficient light to the liquid crystal panel. Here, the optical film layer may include a diffusion sheet, an optical sheet, a protective sheet and the like.

A plurality of sheet layers composed of the optical film layer has a high change in optical properties depending on the conditions provided and structural conditions. Here, the change in the optical characteristics of the optical film layer affects the light efficiency of the backlight unit and also affects the display quality of the liquid crystal display device.

Therefore, in order to improve the display quality of the liquid crystal display device, there is a need to continue research in the field related to the optical film layer.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical sheet, a method for manufacturing the same, and a liquid crystal display device using the same.

The present invention as a problem solving means described above, the base film having a thickness of 20㎛ 1000㎛; A first protrusion located on one surface of the base film; A second protrusion positioned on the other surface of the base film and including a concave portion and a convex portion; And a reflector positioned in the recess of the second protrusion, wherein the recess is located corresponding to the area in which the valley of the first protrusion is formed, and the first protrusion includes a floor and a valley and includes a plurality of beads therein. The reflector provides an optical sheet comprising any one of titanium dioxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium sulfate, barium carbonate, zinc oxide, magnesium hydroxide, calcium hydroxide, or talc.
The first protrusion and the second protrusion may be a transparent material.
At least one of the first protrusion and the second protrusion may be an ultraviolet curable resin.
On the other hand, the present invention, the step of preparing a base film having a thickness of 20㎛ to 1000㎛; Forming a first protrusion including a floor and a valley on one surface of the base film; Forming a second projection including a concave portion and a convex portion on the other surface of the base film; And forming a reflective layer on the convex portion and the concave portion of the second protrusion, and scraping the surface of the convex portion of the second protrusion to form the reflective portion, wherein the concave portion is located corresponding to the area where the valley of the first protrusion is formed, 1 The protrusion is a prism including a floor and a valley and a plurality of beads therein, the reflecting portion is titanium dioxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium sulfate, barium carbonate, zinc oxide, magnesium hydroxide, calcium hydroxide, Or it provides a method for producing an optical sheet comprising any one of talc.
On the other hand, the present invention, the light source; A first projection part located on one surface of the base film having a thickness of 20 μm to 1000 μm on the light source and including a floor and a valley, and a second projection part located on the other surface of the base film and including a concave part and a convex part; An optical sheet including a reflector positioned in a recess of the second protrusion; And a liquid crystal panel displaying an image by using light emitted from the light source, wherein the concave portion is located corresponding to an area in which the valley of the first projection is formed, and the first projection includes a floor and a valley and has a plurality of beads therein. A prism including the liquid crystal display, wherein the reflector includes any one of titanium dioxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium sulfate, barium carbonate, zinc oxide, magnesium hydroxide, calcium hydroxide, or talc. To provide.
The plurality of beads may have a random shape or a shape in which small beads are included therein.

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The present invention has an effect of improving the display quality of the liquid crystal display device by providing an optical sheet and a method of manufacturing the same that can improve the optical characteristics.

Hereinafter, with reference to the accompanying drawings, the specific content for the practice of the present invention will be described.

<Optical Sheet>

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

As shown in FIG. 1, the optical sheet may include a base film 110. In addition, the base film 110 may include a first protrusion 120 positioned in one direction on the surface of the base film 110 and including the floor 120a and the valley 120b. In addition, the second film 130 may include a second protrusion 130 positioned on the other surface of the base film 110 and including a concave portion 130a and a convex portion 130b. In addition, the second protrusion 130 may include a reflector 140 positioned in the recess 130a of the second protrusion 130.

Here, the recess 130a of the second protrusion 130 may be located corresponding to the region where the valley 120b of the first protrusion 120 is formed.

Here, the first protrusion 120 and the second protrusion 130 may be a transparent material.

Meanwhile, the first protrusion 120 according to the first embodiment may have a lenticular lens shape as shown. The reflector 140 may include any one of titanium dioxide, aluminum, aluminum oxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium sulfate, barium carbonate, zinc oxide, magnesium hydroxide, calcium hydroxide, or talc. It doesn't work.

At least one of the first protrusion 120 and the second protrusion 130 described above may be, but is not limited to, an Ultra Violet Curing Resin resin.

2 is a perspective view of an optical sheet according to a second embodiment of the present invention.

As shown in FIG. 2, the optical sheet includes a base film 210 as described above, a first protrusion 220 positioned on the base film 210 and including a floor 220a and a valley 220b. The second protrusion 230, which is located on the other surface of the base film 210 and includes the recess 230a and the convex portion 230b, and the reflector located in the recess 230a of the second protrusion 230, is provided. 240 may be included. Here, the recess 230a of the second protrusion 230 may be located corresponding to the area where the valley 220b of the first protrusion 220 is formed.

However, in the optical sheet according to the second embodiment, as in the first embodiment, the first protrusion 220 may have a lenticular lens shape or the lenticular lens shape may include a plurality of beads 250. .

3 is a perspective view of an optical sheet according to a third embodiment of the present invention.

As shown in FIG. 3, the optical sheet includes a base film 310 as described above, a first protrusion 320 positioned on the base film 310 and including a floor 320a and a valley 320b. The second protrusion 330 is disposed on the other surface of the base film 310 and includes a recess 330a and a convex portion 330b, and a reflector positioned in the recess 330a of the second protrusion 330. 340 may be included. Here, the concave portion 330a of the second protrusion 330 may be located corresponding to the area where the valley 320b of the first protrusion 320 is formed.

However, in the optical sheet according to the third embodiment, unlike the first or second embodiment, the first protrusion 320 may have a prism shape.

4 is a perspective view of an optical sheet according to a fourth embodiment of the present invention.

As shown in FIG. 4, the optical sheet includes a base film 410 as described above, a first protrusion 420 positioned on the base film 410 and including a floor 420a and a valley 420b. The second protrusion 430 is disposed on the other surface of the base film 410 and includes a recess 430a and a convex portion 430b, and a reflector positioned in the recess 430a of the second protrusion 430. 440 may include. Here, the concave portion 430a of the second protrusion 430 may be located corresponding to the area where the valley 420b of the first protrusion 420 is formed.

However, in the optical sheet according to the fourth embodiment, the first protrusion 420 may have a prism shape, as in the second embodiment, and the first protrusion 420 of the prism shape may include a plurality of beads 450. have.

Meanwhile, the first protrusions 320 and 420 having the prism shape shown in the above-described third and fourth embodiments are not limited to the shapes shown in FIGS. 3 and 4, but may be formed in the following shapes. Hereinafter, the present invention will be described in more detail with reference to FIG. 5.

5 is a diagram illustrating various embodiments of a prism shape.

First, referring to FIG. 5A, the prism shape may be patterned in a triangular shape and the floors of the mountains may have different heights.

Next, referring to FIG. 5 (b), the prism shape may be patterned in a triangular shape, and the floor of the mountain may be formed to have different heights in an unspecified shape. That is, the vertical amplitude of the floor of the mountain may be formed differently.

Next, referring to FIG. 5C, the prism shape may be formed so as to be patterned such that the triangular shape or the floor of the mountain is rounded.

Here, the prismatic shape described above is not limited to FIGS. 5A to 5C and may have a shape modified to another shape.

Meanwhile, the beads shown in the above-described second and fourth embodiments are not limited to the shapes shown in FIGS. 2 and 4, but may be formed in the following shapes. Hereinafter, the present invention will be described in more detail with reference to FIG. 6.

6 is a diagram illustrating various embodiments of beads.

Referring to FIG. 6A, the bead 640 may have a ball shape. The bead 640 may refract light incident from the outside twice inside and have a single reflection effect.

Referring to FIG. 6B, the bead 640 may have a snowman shape or a closed curve shape in which two balls are connected. The bead 640 may have an effect of transmitting one side of the light incident from the outside and diffusing the other side.

Referring to FIG. 6C, the beads 640 may have a random shape. The bead 640 may also have a reflection effect that causes the light incident from the outside to be refracted and reflected at various angles inside.

Referring to FIG. 6D, the bead 640 may have a small bead 645 therein. The bead 640 may also have a reflection effect that causes the light incident from the outside to be refracted and reflected at various angles inside.

On the other hand, unlike shown, the small beads 645 included in the interior of the bead 640 may be exposed to the outside. In addition, the inside of the bead 640 may be divided into upper and lower portions, and small beads 645 may be formed in the inside of the bead 640 at different specific gravity.

<Method of manufacturing optical sheet>

7 is a view for explaining a manufacturing method of an optical sheet according to an embodiment of the present invention.

As shown in FIG. 7, the method of manufacturing the optical sheet is as follows.

A step of preparing the base film 710 is performed.

The material of the base film 710 may be selected from the group consisting of polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene, and polyepoxy, but is not limited thereto.

In addition, the base film 710 may have a predetermined thickness, for example, a thin thickness of 20 μm to 1000 μm, but is not limited thereto. Thus, when the thickness of the base film 710 is formed to 20㎛ or more, it can be thinned within the limit to secure the mechanical strength and thermal stability of the sheet. When the thickness of the base film 710 is formed to 1000 μm or less, mechanical strength and thermal stability may be maximized within the limit of securing flexibility of the sheet. In addition, when formed in the thickness range, it may have excellent properties in terms of processability and may be curved like a film.

Next, a step of forming a first protrusion 720 including a floor and a valley on one surface of the base film of the base film 710 is performed.

The first protrusion 720 formed on one surface of the base film 710 may have a lenticular lens or a prism shape as shown in FIGS. 1 to 4, and the material for forming the base film 710 may be an ultraviolet curable resin. However, the present invention is not limited thereto. Here, when the first protrusion part 720 is formed in a prism shape, the prism shape may have other shapes as shown in FIGS. 5A to 5C, but is not limited thereto.

In addition, the first protrusion 720 having the shape of a lenticular lens or a prism may include beads of various shapes as illustrated in FIGS. 6A to 6D, but is not limited thereto. It may also include beads in the form. The material of the bead may be polymethly methacrylate (PMMA), silica, or the like, but is not limited thereto.

Next, a step of forming a second protrusion 730 including a concave portion 730a and a convex portion 730b on the other surface of the base film 710 is performed.

When the second protrusion 730 is formed on the other surface of the base film 710, the recessed portion corresponding to the area where the valley 720b of the first protrusion 720 located on one surface of the base film 710 is formed is formed. The pattern 730a may be formed. At this time, the region other than the concave portion 730a will be the convex portion 730b.

Next, the reflective layer 740 is formed in the area recessed with the upper surface of the second protrusion 730 and the surface of the convex portion 730b of the second protrusion 730 is scraped to form the reflective portion 740b. Is carried out.

When the reflective layer 740 is formed on the second protrusion 730, the reflective layer 740 may be formed on the convex portion 730b as well as inside the concave portion 730a of the second protrusion 730. Subsequently, when the convex portion 730b of the second protrusion 730 is scraped off in the S direction by using the mechanism 760, the reflective layer 740a positioned on the upper surface of the convex portion 730b of the second protrusion 730. ) May be removed and only the reflecting portion 740b remains in the recess 730a.

Here, the direction of scraping the surface of the convex portion 730b of the second protrusion 730 may proceed in the opposite direction instead of the S direction. In addition, when scraping the surface of the convex portion 730b of the second protrusion 730 using the mechanism 760, a precise system may be used so that the surface of the second protrusion 730 is not damaged.

Here, the material of the reflective layer 740 formed in the second protrusion 730 is titanium dioxide, aluminum, aluminum oxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium sulfate, barium carbonate, zinc oxide, magnesium hydroxide, calcium hydroxide, Or talc, but is not limited thereto.

Here, at least one of the first protrusion 720 and the second protrusion 730 may be an ultraviolet curable resin, but is not limited thereto.

<LCD display device>

8 is an exploded perspective view of a liquid crystal display according to the present invention, and FIG. 9 is an exemplary view of an edge type light source.

As shown in FIG. 8, the liquid crystal display may include a light source 840 that emits light. In addition, the first projection is located on one surface of the base film located on the light source 840, including the ridge and valleys, the second projection is located on the other surface of the base film and includes a concave portion and a convex portion, the second projection It may include an optical sheet 833 including a reflecting portion located in the recess of. In addition, the liquid crystal panel 820 may display an image by using light emitted from the light source 840. However, the concave portion of the second protrusion included in the optical sheet 833 may be located corresponding to the area where the valley of the first protrusion is formed.

In the case of the optical sheet 833, for example, the optical sheet 833 may select one of the first projection portion having a lenticular lens or a prism shape.

In more detail, the first protrusion may have a lenticular lens or a prism shape as shown in FIGS. 1 to 4 described above, and when the first protrusion is formed in a prism shape, the prism shape is other than that shown in FIGS. It may have the form as shown in (c), but is not limited thereto.

In addition, beads of various shapes may be located inside the first protrusion having the lenticular lens or the prism shape, as illustrated in FIGS. 6A to 6D, but are not limited to those illustrated. Beads may be located.

In the case of the light source 840, for example, a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), an external electrode fluorescent lamp (EEFL) And a light emitting diode (LED) may be selected, but is not limited thereto.

In addition, the light source 840 may select any one of an edge type in which the lamp is located on one side outside, a dual type in which the lamp is located on both sides, and a direct type in which a plurality of lamps are arranged in a straight line, but is not limited thereto. The light source 840 as described above may be connected to an inverter to receive power to emit light.

Here, the light source 840 shown in FIG. 8 shows a direct type as an example. Alternatively, referring to FIG. 9, an edge type light source 940 is shown. The edge type light source 940 as shown may include a lamp 941 and a light guide plate 942 for guiding light emitted from the lamp 941 on one side outside.

The liquid crystal display may include a liquid crystal panel 820 for displaying an image, and an upper case 810 and a lower case 870 in which the light source 840 is accommodated.

Here, the lower case 870 may receive the light source 840. The liquid crystal panel 820 may be positioned at a predetermined interval on the light source 840. The liquid crystal panel 820 and the light source 840 may be fixed and protected by the upper case 810 fastened to the lower case 870.

An opening for exposing an image display area of the liquid crystal panel 820 may be provided on an upper surface of the upper case 810. In addition, a mold frame (not shown) may be further included on the periphery of the plurality of optical film layers 830 positioned between the liquid crystal panel 820 and the light source 840.

The liquid crystal panel 820 may have a structure in which an upper plate 822 having a color filter and a lower plate 821 having a thin film transistor are bonded to each other with a liquid crystal interposed therebetween. In the liquid crystal panel 820, subpixels driven independently by a thin film transistor are arranged in a matrix form, and a difference between a common voltage supplied to each common pixel and a data signal supplied to the pixel electrode through the thin film transistor is provided. The image can be displayed by controlling the liquid crystal array in accordance with the voltage to adjust the light transmittance.

In addition, the driving unit 825 may be connected to the lower plate 821 of the liquid crystal panel 820. The driver 825 is equipped with a driving chip 827 for driving the data line and the gate line of the liquid crystal panel 820, respectively, a plurality of film circuits 826 having one side connected to the lower plate 821, and a plurality of films. The printed circuit board 828 may be connected to the other side of the circuit 826.

The film circuit 826 on which the driving chip 827 is mounted shows a Chip On Film (COF) or Tape Carrier Package (TCP) method. Alternatively, the driving chip 827 may be directly mounted on the lower plate 821 in a chip on glass (COG) manner, or may be formed and embedded on the lower plate 821 in the thin film transistor forming process.

Here, the plurality of optical film layers 830 positioned between the liquid crystal panel 820 and the light source 840 may have a diffusion plate 831, a diffusion sheet 832, and a protective sheet 834 in addition to the optical sheet 833 described above. And the like may be further included.

The liquid crystal panel 820 described above may display an image on each pixel according to a scan signal supplied through the gate lines and a data voltage supplied through the data lines.

Here, the scan signal may be a pulse signal in which a gate high voltage supplied only for one horizontal time and a gate low voltage supplied for the remaining period are alternated.

The thin film transistor included in the pixel may be turned on when the gate high voltage is supplied from the gate lines to supply the data voltage applied from the data lines to the liquid crystal cell.

The liquid crystal cell may be formed between the pixel electrode supplied with the data voltage from the data lines and the common electrode applied with the common voltage.

Accordingly, when the thin film transistor of each pixel is turned on and the data voltage is applied to the pixel electrode, the liquid crystal display may display an image while charging the difference voltage between the data voltage and the common voltage in the liquid crystal cell.

On the contrary, when the gate low voltage is supplied from the gate lines, the thin film transistor is turned off and the data voltage charged in the liquid crystal cell can be maintained by the storage capacitor for one frame period.

As such, the liquid crystal panel 820 may repeat different operations according to scan signals supplied through the gate lines.

As described above, the present invention can provide a liquid crystal display having an optical sheet capable of efficiently utilizing light emitted from a backlight unit, reducing power consumption according to the use of a battery and a light source, increasing luminance, and having a wide viewing angle. .

Therefore, the present invention described above has an effect of improving the display quality of the liquid crystal display device by providing an optical sheet and a manufacturing method thereof that can improve the optical characteristics.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

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

2 is a perspective view of an optical sheet according to a second embodiment of the present invention.

3 is a perspective view of an optical sheet according to a third embodiment of the present invention.

4 is a perspective view of an optical sheet according to a fourth embodiment of the present invention.

5 illustrates various embodiments of prismatic shapes.

6 illustrates various embodiments of beads.

7 is a view for explaining a manufacturing method of an optical sheet according to an embodiment of the present invention.

8 is an exploded perspective view of a liquid crystal display device according to the present invention;

9 is an exemplary view of an edge type light source.

<Explanation of symbols on main parts of the drawings>

110,210,310,410: base film 120,220,320,420: first protrusion

130, 230, 330, 430: second protrusion 140, 240, 340, 440: reflector

820: liquid crystal panel 825: driver

830: optical film layer 840: light source

Claims (16)

A base film having a thickness of 20 μm to 1000 μm; A first protrusion located on one surface of the base film; A second protrusion positioned on the other surface of the base film and including a concave portion and a convex portion; And A reflection part located in the concave part of the second protrusion part, The concave portion is located corresponding to the area in which the valleys of the first projection is formed, The first protrusion is a prism including a floor and a valley and a plurality of beads therein, The reflection unit, any one of titanium dioxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium sulfate, barium carbonate, zinc oxide, magnesium hydroxide, calcium hydroxide, or talc. delete The method of claim 1, The first protrusion and the second protrusion, Optical sheet made of transparent material. delete delete The method of claim 1, At least one of the first protrusion and the second protrusion is an ultraviolet curable resin. Preparing a base film having a thickness of 20 μm to 1000 μm; Forming a first protrusion including a floor and a valley on one surface of the base film; Forming a second projection including a concave portion and a convex portion on the other surface of the base film; And Forming a reflective layer on the convex portion and the concave portion of the second protrusion, and scraping a surface of the convex portion of the second protrusion to form a reflective portion, The concave portion is located corresponding to the area in which the valleys of the first projection is formed, The first protrusion is a prism including a floor and a valley and a plurality of beads therein, The reflecting unit, any one of titanium dioxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium sulfate, barium carbonate, zinc oxide, magnesium hydroxide, calcium hydroxide, or talc. delete delete delete Light source; A first protrusion on the light source and located on one surface of the base film having a thickness of 20 μm to 1000 μm and including a floor and a valley; And an optical sheet including a reflector positioned in the recess of the second protrusion; And It includes a liquid crystal panel for displaying an image using the light emitted from the light source, The concave portion is located corresponding to the area in which the valleys of the first projection is formed, The first protrusion is a prism including a floor and a valley and a plurality of beads therein, The reflector includes any one of titanium dioxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium sulfate, barium carbonate, zinc oxide, magnesium hydroxide, calcium hydroxide, or talc. delete delete The method of claim 1, The plurality of beads, Optical sheet, characterized in that the random shape or a shape containing a small bead inside. The method of claim 7, wherein The plurality of beads, Method of manufacturing an optical sheet, characterized in that the random shape or a shape containing a small bead inside. The method of claim 11, The plurality of beads, Liquid crystal display, characterized in that the random shape or a shape containing a small bead inside.

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