KR100957496B1 - Reflective polarizing film, backlight unit and liquid crystal display including the same - Google Patents

Abstract

The present invention provides a reflective polarizing film including an optical layer, a first primer layer positioned on one surface of the optical layer, and a first protrusion disposed on the primer layer.

primer

Description

Reflective polarizing film, backlight unit and liquid crystal display including the same {Reflective Polarized Light Film, Back Light Unit And Liquid Crystal display Device Comprising the same}

The present invention relates to a backlight unit and a liquid crystal display device including the reflective polarizing film.

Recently, the display field for visually expressing various electrical signal information is rapidly developing, and in response to this, various flat panel displays (FPDs) with excellent characteristics such as thinness, light weight, and low power consumption are being developed. It is introduced and rapidly replaced the existing CRT (Cathode Ray Tube).

Examples of such flat panel displays include liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), and electroluminescence displays (ELDs). The liquid crystal display device has a high contrast ratio and is excellent in moving image display, and is currently being actively used in the field of display screens, monitors, and TVs for notebook computers.

In general, a liquid crystal display device classified as a light receiving display device may include a backlight unit disposed below the liquid crystal panel to provide light to the liquid crystal panel in addition to the liquid crystal panel displaying an image.

The backlight unit may be configured of a light source and an optical film to provide light to the liquid crystal panel. Here, the optical film may include a diffusion sheet, a prism sheet or a protective sheet.

Such a backlight unit is made of an optical film made up of a plurality of optical sheets for diffusing and condensing light emitted from a light source, but there are many limitations in achieving improvement in manufacturing yield and brightness of the backlight unit.

Accordingly, the reflective polarizing film, the backlight unit and the liquid crystal display including the same, provide a reflective polarizing film having a uniform distribution of luminance, a backlight unit and the liquid crystal display including the same.

In order to achieve the above object, a reflective polarizing film according to an embodiment of the present invention includes an optical layer, a first primer layer located on one surface of the optical layer and a first protrusion located on the primer layer. can do.

In addition, the backlight unit according to an embodiment of the present invention includes a light source and a reflective polarizing film positioned on the light source, wherein the reflective polarizing film is an optical layer and a first primer layer positioned on one surface of the optical layer. And a first protrusion located on the primer layer.

In addition, the liquid crystal display device according to an embodiment of the present invention includes a light source, a reflective polarizing film positioned on the light source and a liquid crystal panel positioned on the reflective polarizing film, the reflective polarizing film is an optical layer , A first primer layer positioned on one surface of the optical layer and a first protrusion positioned on the primer layer.

In addition, the reflective polarizing film according to an embodiment of the present invention is located on the optical layer, the substrate layer located on one surface of the optical layer, the first primer layer located on the substrate layer and the first primer layer. It may include a first protrusion.

In addition, the backlight unit according to an embodiment of the present invention includes a light source and a reflective polarizing film positioned on the light source, wherein the reflective polarizing film is an optical layer, a base layer positioned on one surface of the optical layer, It may include a first primer layer located on the substrate layer and a first protrusion located on the first primer layer.

In addition, the liquid crystal display device according to an embodiment of the present invention includes a light source, a reflective polarizing film positioned on the light source and a liquid crystal panel positioned on the reflective polarizing film, the reflective polarizing film is an optical layer , A base layer positioned on one surface of the optical layer, a first primer layer positioned on the base layer, and a first protrusion disposed on the first primer layer.

The reflective polarizing film of the present invention, the backlight unit and the liquid crystal display including the same may enhance the diffusion property of the protrusion by enhancing the adhesion between the substrate layer or the optical layer and the protrusion, and thus the luminance distribution is uniform. There is an advantage that one backlight unit and a liquid crystal display device can be provided.

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

1A to 1F are cross-sectional views of a reflective polarizing film according to an embodiment of the present invention.

1A to 1F, the reflective polarizing film 200 according to the exemplary embodiment of the present invention may include an optical layer 210, a first primer layer 220 positioned on one surface of the optical layer 210, and It may include a first protrusion 230 located on the first primer layer 220.

The optical layer 210 may serve to transmit or reflect light incident from the light source. The optical layer 210 includes a first layer 211 including a polymer material and a second layer adjacent to the first layer 211 and including a polymer material having a refractive index different from that of the first layer 211. 212.

Here, the first layer 211 and the second layer 212 may have a structure that is alternately positioned repeatedly. In this case, the first layer 211 may be polymethyl methacrylate (PMMA), and the second layer 212 may be made of polyester.

In addition, the optical layer 210 preferably has a thickness of 120 to 450㎛.

Accordingly, some of the light incident from the light source is transmitted through the optical layer 210 and some is reflected from the optical layer 210 toward the lower light source. At this time, the light reflected toward the light source is reflected again to be incident to the optical layer 210, a part of the light incident on the optical layer 210 is transmitted through the optical layer 210, a part of the lower portion in the optical layer 210 Is reflected again in the direction of the light source.

That is, the optical layer 210 alternately stacks polymer layers having different refractive indices, aligns the molecular orientation of the polymer in one direction, and transmits only the polarization in the other direction and reflects the polarization in the same direction. The efficiency of light incident from the light source can be improved.

The first primer layer 220 may be formed by a primer treatment process.

The primer treatment may serve to improve adhesion of the polymer film and the UV resin by performing a polymer treatment on a general polymer film.

In this case, as the polymer material used for the primer treatment, acrylic (Acryl), ester (Ester) or urethane (Urethane) may be used, and a water-soluble polymer material may be used to prevent the risk of fire.

The primer treatment process may be performed by applying the above-described polymer material on a substrate to be primed, and coating it using a coater device.

The first primer layer 220 formed as described above may have a thickness of about 5 nm to about 300 nm. Here, when the thickness of the first primer layer 220 is 5nm or more, it is possible to prevent the disadvantage that the thickness of the primer layer is so thin that the property of improving adhesive strength does not appear, and the thickness of the first primer layer 220 is 300nm or less. In addition, there is an advantage of preventing coating stains or agglomeration of polymer materials from occurring during the primer treatment process.

Table 1 below shows the results of measuring the transmission characteristics and the adhesion characteristics according to the thickness of the primer layer.

Thickness of primer layer (nm) Transmission characteristics Adhesive properties 3 ◎ △ 5 ◎ △ 10 ◎ △ 30 ◎ ○ 90 ○ ○ 130 ○ ○ 200 ○ ◎ 250 △ ◎ 300 △ ◎

◎: very good, ○: excellent, △: normal

As shown in Table 1, the first primer layer 220 may be finely adjusted for the thickness to improve brightness, color coordinates, and the like.

Therefore, when the primer treatment between the optical layer 210 and the protrusion 230 to be described later, by adjusting the thickness of the primer layer 220, there is an effect that can improve the light transmittance and adhesive properties.

On the other hand, unlike the pressure-sensitive adhesive or adhesive that is physically bonded to the first primer layer 220 may be induced to bond to the optical layer 210 and the protrusion through the chemical bonding.

That is, the material of the optical layer 210 may be poly-based, and the material of the protrusion may be UV (ultra violet) resin series. In this case, when the general physical texture between the optical layer 210 and the protrusion is attempted, it is difficult to expect superior adhesion due to the smooth interface. However, when attempting chemical bonding by forming the primer layer 220 between the optical layer 210 and the protrusion, it is possible to expect superior adhesion than the physical bonding and to protect the interface to be attached to each other.

Next, in order to support the above description, when the resin is selected as the material of the protrusion and urethane is selected as the material of the primer layer 220, the chemical reaction between the two materials according to UV curing is shown.

The first protrusion 230 may be located on the first primer layer 220, and the first protrusion 230 may serve to condense or diffuse light incident from the light source.

The first protrusion 230 may be made of a transparent polymer resin to transmit light incident from the outside. Here, the polymer resin may be any one selected from the group consisting of acrylic, polycarbonate, polypropylene, polyethylene, and polyethylene terephthalate.

The cross section of the first protrusion 230 may have a triangular prism shape. In this case, as shown in FIG. 1B, the first protrusion 230 includes a peak 231 and a valley 232, and the peak 231 and the valley 232 extend in a length direction of the first protrusion 230. In the same way as may be made of a straight line.

Here, the distance P between the peaks 231 of the first protrusion 230 may be 20 to 60 μm, and the angle A of the peak 231 may be 70 to 110 °. In addition, the height of the first protrusion 230 may be 10 to 300㎛.

In addition, as shown in FIG. 1C, the peaks 231 or valleys 232 of the first protrusion 230 may form a continuous bend in the longitudinal direction of the first protrusion 230, and the bend may be regular or It may be irregular.

That is, the peak 231 of the first protrusion 230 may have a zigzag shape in which left and right are random, and the average horizontal amplitude of the peak 231 may be 1 to 20 μm.

In addition, the valleys 232 of the first protrusion 230 may have a random zigzag shape, and the average horizontal amplitude of the valleys 232 may be 1 to 20 μm.

In addition, the height H of the peak 231 of the first protrusion 230 may vary continuously from each bottom surface, and may form a regular or irregular bend. At this time, the average height difference of the peaks 231 of the first protrusion 230 may be 1 to 20㎛.

Unlike the above, the cross-sectional shape of the first protrusion 230 may be hemispherical.

In more detail, the first protrusion 230 may be in the form of a micro lens as shown in FIG. 1D.

Here, the plurality of micro lenses 235 may be arranged in the first protrusion 230. The microlens 235 may have a degree of diffusion, refraction, or concentration of light depending on the diameter and the density of the lens. Accordingly, the diameter of each lens of the micro lens 235 may be 20 to 200㎛. In addition, the ratio of the microlens 235 to the total area may be 80 to 90%, or more.

In addition, the first protrusion 230 may be in the form of a lenticular lens as shown in FIG. 1E.

Here, the lenticular lens may be in the form of a tunnel filled inside, and the diffusion, refraction, or concentration of light may vary according to each pitch and height.

The first protrusion 230 may be a diffusion part as shown in FIG. 1F. That is, the first protrusion 230 may include a plurality of beads 238 and may serve to diffuse light incident from the light source.

2 is a sectional view of a reflective polarizing film according to another embodiment of the present invention.

Referring to FIG. 2, as described above, the reflective polarizing film 300 of the present invention includes the optical layer 310, the first primer layer 320 and the first primer layer (located on the optical layer 310). The first protrusion 330 may be positioned on the 320.

Here, the first protrusion 330 may include a resin 337 and a plurality of beads 338. The resin 337 may be acrylic resin, and the beads 338 may be any one or more selected from the group consisting of polymethylmethacrylate (PMMA), polystyrene, and silicone.

Here, the beads 338 with respect to the resin 337 may be included in 1 to 10 parts by weight. In addition, the particle diameters of the beads 338 distributed in the resin 337 may not be uniform and may have an irregular distribution.

The shape of the bead 338 may be a circle, an oval, a snowman, an uneven circle, but is not limited thereto.

In addition, the beads 338 distributed in the resin 337 may have an irregular distribution without having a regular distribution in the resin 337. In this case, the beads 338 distributed in the resin 337 may be completely included so as not to be exposed on the surface of the first protrusion 330.

Therefore, the reflective polarizing film according to another embodiment of the present invention may exhibit an effect of diffusing light incident from the light source by including a plurality of beads in the first protrusion.

In the above description, a prism shape having a triangular cross section of the first protrusion is described. However, the present invention is not limited thereto, and the first protrusion may have a plurality of beads.

3 is a view showing a reflective polarizing film according to another embodiment of the present invention.

Referring to FIG. 3, as described above, the reflective polarizing film 400 according to another embodiment of the present invention may include an optical layer 410 and a first primer layer 420a positioned on one surface of the optical layer 410. And a first protrusion 430a positioned on the first primer layer 420a.

Reflective polarizing film 400 according to another embodiment of the present invention is a second primer layer 420b located on the other surface of the optical layer 410 and a second located on the second primer layer 420b. It may further include a protrusion 430b.

Since the optical layer 410, the first primer layer 420a, and the first protrusion 430a have been described above, a description thereof will be omitted.

The second primer layer 420b may be positioned on the other surface of the optical layer 410 and may be formed by a primer treatment process in the same manner as the first primer layer 420a.

As the second primer layer 420b, acryl, ester, urethane, or the like may be used, and a water-soluble polymer material may be used to prevent the risk of fire.

The second primer layer 420b may have a thickness of about 5 nm to about 300 nm. Here, when the thickness of the second primer layer 420b is 5 nm or more, the disadvantage that the thickness of the primer layer is too thin to improve the adhesive strength may be prevented, and when the thickness of the second primer layer 420b is 300 nm or less, In addition, there is an advantage of preventing coating stains or agglomeration of polymer materials from occurring during the primer treatment process.

The second protrusion 430b may be positioned on the second primer layer 420b, and the second protrusion 430b may serve to collect or diffuse light incident from the light source.

The second protrusion 430b may be made of a transparent polymer resin to transmit light incident from the outside. Here, the polymer resin may be any one selected from the group consisting of acrylic, polycarbonate, polypropylene, polyethylene, and polyethylene terephthalate.

The second protrusion 430b may have a configuration similar to that of the first protrusion 430a described above. That is, the second protrusion 430b may be formed of any one of a prism shape, a micro lens shape, a lenticular lens shape, and a diffuser shape, and the second protrusion 430b may further include a plurality of beads (not shown). can do.

The present embodiment has been briefly described in order to avoid overlapping description with the above-described embodiments, but the present embodiment may include all the configurations described in the above-described embodiments.

4 is a cross-sectional view illustrating a reflective polarizing film according to another exemplary embodiment of the present invention.

Referring to FIG. 4, the reflective polarizing film 500 according to another embodiment of the present invention may include an optical layer 510, a base layer 520 positioned on the optical layer 510, and the base layer 520. It may include a first primer layer 530 positioned on and a first protrusion 540 located on the first primer layer 530.

Since the configuration of the optical layer 510, the first primer layer 530 and the first protrusion 540 of the present embodiment may be the same as the optical layer, the first primer layer and the first protrusion of the above-described embodiments, the present embodiment In the example, the description is omitted.

The base layer 520 transmits the light incident from the light source. To this end, since the substrate layer 520 must be able to transmit light incident from the light source, a light transmissive material, for example, polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene and polyepoxy selected from the group consisting of It may be made of any one, but is not limited thereto.

The base layer 520 may be formed to a thickness of 10 to 1000㎛. Here, when the thickness of the base layer 520 is 10 μm or more, there is an advantage that the mechanical strength and thermal stability of the film can be secured. When the thickness of the base layer 520 is 1000 μm or less, the mechanical strength and heat of the film There is an advantage that can maintain the flexibility of the film while ensuring stability.

Accordingly, the reflective polarizing film 500 according to another embodiment of the present invention is an optical layer 510, a base layer 520 positioned on the optical layer 510, and positioned on the base layer 520. By including the first primer layer 530 and the first protrusion 540 positioned on the first primer layer 530, there is an advantage that the mechanical strength, thermal stability and flexibility of the film can be secured.

5 is a view showing a reflective polarizing film according to another embodiment of the present invention.

Referring to FIG. 5, the reflective polarizing film 600 according to another exemplary embodiment of the present invention may include an optical layer 610, a base layer 620 positioned on one surface of the optical layer 610, A first primer layer 630a positioned on the base layer 620 and a first protrusion 640a positioned on the first primer layer 630a may be included.

Reflective polarizing film 600 according to another embodiment of the present invention is a second primer layer 630a located on the other surface of the optical layer 610 and a second protrusion located on the second primer layer 630a. 640b may be further included.

Since the configuration of the optical layer 610, the first primer layer 630a and the first protrusion 640a of the present embodiment may be the same as the optical layer, the first primer layer and the first protrusion of the above-described embodiments, the present embodiment In the example, the description is omitted.

The second primer layer 630b is positioned on the other surface of the optical layer 610 and may be formed by a primer treatment process in the same manner as the first primer layer 630a.

As the second primer layer 630b, acryl, ester, urethane, or the like may be used, and a water-soluble polymer may be used to prevent the risk of fire.

The second primer layer 630b may have a thickness of about 5 nm to about 300 nm. Here, when the thickness of the second primer layer 630b is 5 nm or more, the disadvantage that the thickness of the primer layer is too thin to improve the adhesive strength may be prevented. When the thickness of the second primer layer 630b is 300 nm or less, In addition, there is an advantage of preventing coating stains or agglomeration of polymer materials from occurring during the primer treatment process.

The second protrusion 640b may be located on the second primer layer 640b, and the second protrusion 640b may serve to collect or diffuse light incident from the light source.

The second protrusion 640b may be made of a transparent high molecular resin to transmit light incident from the outside. Here, the polymer resin may be any one selected from the group consisting of acrylic, polycarbonate, polypropylene, polyethylene, and polyethylene terephthalate.

The second protrusion 640b may have a configuration similar to that of the first protrusion 640a described above. That is, the second protrusion 640b may have any one of a prism shape, a micro lens shape, a lenticular lens shape, and a diffuser shape, and the second protrusion 640b may further include a plurality of beads (not shown). can do.

The present embodiment has been briefly described in order to avoid overlapping description with the above-described embodiments, but the present embodiment may include all the configurations described in the above-described embodiments.

6A to 6B are exploded perspective views and cross-sectional views illustrating a configuration of a backlight unit including a reflective polarizing film according to embodiments of the present invention.

In FIG. 6A, an edge type backlight unit is illustrated as the backlight unit, and the overlapping description is omitted since the optical sheet of the present invention is the same as the above-described optical sheet.

6A and 6B, the backlight unit 700 according to an exemplary embodiment of the present invention may be provided in the liquid crystal display device and may provide light to the liquid crystal panel provided in the liquid crystal display device.

The backlight unit 700 may include a light source 720 and an optical sheet 730. In addition, the backlight unit 700 may further include a light guide plate 740, a reflective plate 750, a bottom cover 760, and a mold frame 770.

The light source 720 may generate light by using driving power applied from the outside, and may emit the generated light.

For example, at least one light source 720 may be formed on one side of the light guide plate 740 along the long axis direction of the light guide plate 740, or at least one light source may be formed on each side of the light guide plate 740. . Here, the light emitted from the light source 720 is incident directly into the light guide plate 740, or the light source housing 722 formed to cover a portion of the light source 720, for example, about 3/4 of the outer peripheral surface of the light source 720 After reflection, the light guide plate 740 may be incident into the light guide plate 740.

The light source 720 may include, 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. It may be one of (Light Emitting Diode: LED), but is not limited thereto.

The optical sheet 730 may be disposed on the light guide plate 740. The optical sheet 730 may serve to condense the light incident from the light source 720.

The optical sheet 730 includes a substrate, a plurality of protrusions positioned on the substrate, and an optical layer positioned below the substrate, wherein the optical layer is adjacent to the first layer and the first layer comprising a polymer material. And a second layer comprising a polymeric material having a refractive index different from the first layer, wherein the plurality of protrusions include a first protrusion and a second protrusion, and the height of the first protrusion is the second protrusion. May be different from the height.

Therefore, when light is incident from the lower part of the optical sheet 730, the incident light is reflected or transmitted in the optical layer. Therefore, the efficiency of the light incident from the light source can be improved.

In addition, the light transmitted through the optical layer may be irregularly refracted in the plurality of protrusions. Therefore, the plurality of protrusions has an advantage of improving the sharpness of the image by preventing the optical interference phenomenon.

As a result, display quality of the backlight unit 700 according to an exemplary embodiment may be improved.

The light guide plate 740 may be disposed to face the light source 720, and may guide the light so that light incident from the light source 720 is emitted upward.

The reflective plate 750 may be disposed under the light guide plate 740, and may reflect light emitted downward from the light source 720 through the light guide plate 740 upward.

The bottom cover 760 may include a bottom part 762 and a side part 764 formed to extend from the bottom part 762 to form an accommodation space, and the light source 720 and the optical sheet 730 may be formed in the accommodation space. The light guide plate 740 and the reflective plate 750 may be accommodated.

The mold frame 770 may be formed in a substantially rectangular frame shape and may be fastened to the bottom cover 760 from the top of the bottom cover 760 in a top down manner.

7A and 7B are exploded perspective views and cross-sectional views for describing the configuration of a backlight unit according to an embodiment of the present invention.

All. 7A and 7B illustrate a direct backlight unit as the backlight unit, but the present invention is not limited thereto. Meanwhile, the backlight unit illustrated in FIGS. 7A and 7B is substantially the same as the backlight unit illustrated in FIGS. 6A and 6B except for the arrangement of the light sources and the change in the components thereof, and thus, redundant descriptions thereof will be omitted. Only its features will be described.

7A and 7B, the backlight unit 800 according to an exemplary embodiment of the present invention may be provided in a liquid crystal display, and may provide light to the liquid crystal panel provided in the liquid crystal display.

The backlight unit 800 may include a light source 820 and an optical sheet 830. In addition, the backlight unit 800 may further include a reflector 850, a bottom cover 860, a mold frame 870, and a diffuser plate 880.

At least one light source 820 may be disposed under the diffuser plate 880. For this reason, the light emitted from the light source 820 may be incident directly to the diffusion plate 880.

The optical sheet 830 may be disposed on the diffuser plate 880. The optical sheet 830 may serve to collect light incident from the light source 820.

The optical sheet 830 includes a substrate, a plurality of protrusions positioned on the substrate, and an optical layer positioned below the substrate, the optical layer being adjacent to the first layer and the first layer comprising a polymer material. And a second layer comprising a polymeric material having a refractive index different from the first layer, wherein the plurality of protrusions include a first protrusion and a second protrusion, and the height of the first protrusion is It can be different from the height.

Therefore, when light is incident from the lower part of the optical sheet 830, the incident light is reflected or transmitted in the optical layer. Therefore, the efficiency of the light incident from the light source can be improved.

In addition, the light transmitted through the optical layer may be irregularly refracted in the plurality of protrusions. Therefore, the plurality of protrusions has an advantage of improving the sharpness of the image by preventing the optical interference phenomenon.

As a result, display quality of the backlight unit 800 according to an exemplary embodiment may be improved.

The diffusion plate 880 may be disposed between the light source 820 and the optical sheet 830, and may diffuse light incident from the light source 820 upward. This is to prevent the shape of the light source 820 from being visible through the backlight unit 800 and to further diffuse the light.

8A and 8B are exploded perspective views and cross-sectional views illustrating a structure of a liquid crystal display according to an exemplary embodiment of the present invention. 8A and 8B illustrate the backlight unit shown in FIGS. 6A and 6B as the backlight unit, but the present invention is not limited thereto, and the backlight unit illustrated in FIGS. 7A and 7B may be used as the backlight unit. Meanwhile, since the backlight units illustrated in FIGS. 8A and 8B are the same as described above, overlapping descriptions are omitted and only the features thereof will be described.

8A and 8B, the liquid crystal display device 900 according to an exemplary embodiment may display an image by using the electro-optical characteristics of the liquid crystal.

The liquid crystal display device 900 may include a backlight unit 910 and a liquid crystal panel 1010.

The backlight unit 910 may be mounted under the liquid crystal panel 1010 and may provide light to the liquid crystal panel 1010.

The backlight unit 910 may include a light source 920 and an optical sheet 930. In addition, the backlight unit 910 may further include a light guide plate 940, a reflector 950, a bottom cover 960, and a mold frame 970.

The liquid crystal panel 1010 may be seated on the mold frame 970 and may be fixed by the top cover 1020 fastened to the bottom cover 960 in a top-down manner.

The liquid crystal panel 1010 may display an image using light provided from the backlight unit 910, specifically, light emitted from the light source 920.

The liquid crystal panel 1010 may include a color filter substrate 1012 and a thin film transistor substrate 1014 that face each other with the liquid crystal interposed therebetween.

The color filter substrate 1012 may implement colors of an image displayed through the liquid crystal panel 1010.

The color filter substrate 1012 may include a color filter array formed of a thin film on a transparent substrate such as glass or plastic, for example, a red / green / blue color filter. Here, the upper polarizer may be disposed on the color filter substrate 1012.

The thin film transistor substrate 1014 is electrically connected to a printed circuit board 918 on which a plurality of circuit components are mounted through the driving film 916. The thin film transistor substrate 1014 may apply a driving voltage provided from the printed circuit board 918 to the liquid crystal in response to a driving signal provided from the printed circuit board 918.

The thin film transistor substrate 1014 may include a thin film transistor and a pixel electrode formed of a thin film on another substrate of a transparent material such as glass or plastic.

Here, a lower polarizer may be attached to the lower portion of the thin film transistor substrate 1014.

As described above, the reflective polarizing film according to an embodiment of the present invention, a backlight unit and a liquid crystal display device including the same, in an optical film in which a plurality of optical functional layers are stacked, in particular, a primer process on an optical layer or a base layer By performing the to form a primer layer, there is an advantage that can enhance the adhesive force with the protrusion formed on the base layer or the optical layer.

Therefore, the reflective polarizing film, the backlight unit including the same, and the liquid crystal display device according to the exemplary embodiment of the present invention may improve the diffusion or condensing characteristics of the protrusion by enhancing the adhesion between the substrate layer or the optical layer and the protrusion. Accordingly, there is an advantage in that a backlight unit and a liquid crystal display device having a uniform distribution of luminance and an improved display quality can be provided.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the above-described technical configuration of the present invention may be embodied 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.

1A to 1F are cross-sectional views of a reflective polarizing film according to an embodiment of the present invention.

2 is a cross-sectional view of a reflective polarizing film according to another embodiment of the present invention.

3 is a view showing a reflective polarizing film according to another embodiment of the present invention.

Figure 4 is a cross-sectional view showing a reflective polarizing film according to another embodiment of the present invention.

5 is a view showing a reflective polarizing film according to another embodiment of the present invention.

6A and 6B are exploded perspective views and cross-sectional views illustrating a configuration of a backlight unit including an optical film according to embodiments of the present disclosure.

7A and 7B are exploded perspective views and cross-sectional views illustrating a configuration of a backlight unit according to an embodiment of the present invention.

8A and 8B are exploded perspective views and cross-sectional views illustrating a structure of a liquid crystal display according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

200: reflective polarizing film 210: optical layer

220: first primer layer 230: first protrusion

Claims (22)

delete delete delete delete delete delete delete delete delete delete Optical layer; A base layer located on one surface of the optical layer; A first primer layer positioned on the substrate layer; And A first protrusion located on the first primer layer, The optical layer is formed by alternately stacking two or more materials having different refractive indices, The thickness of the first primer layer is 5 to 300nm, The first protrusion has a prism shape including a peak and a valley, and the peak height difference of the peak is 1 to 20 μm. The method of claim 11, Reflective polarizing film further comprising a second primer layer on the other surface of the optical layer. The method of claim 12, Reflective polarizing film further comprises a second protrusion located on the second primer layer. The method of claim 12, The first primer layer and the second primer layer is a reflective polarizing film of any one or more polymer materials selected from the group consisting of acrylic, ester and urethane. The method of claim 12, The thickness of the second primer layer is a reflective polarizing film of 5 to 300nm. delete The method of claim 11, The first protrusion is a reflective polarizing film further comprises a plurality of beads. delete Light source; And It includes a reflective polarizing film located on the light source, The reflective polarizing film includes an optical layer, a base layer positioned on one surface of the optical layer, a first primer layer positioned on the base layer, and a first protrusion positioned on the first primer layer. The optical layer is formed by alternately stacking two or more materials having different refractive indices, The thickness of the first primer layer is 5 to 300nm, The first protrusion has a prism shape including a peak and a valley, and the peak height difference of the peak is 1 to 20 μm. Light source; A reflective polarizing film positioned on the light source; And It includes a liquid crystal panel positioned on the reflective polarizing film, The reflective polarizing film includes an optical layer, a base layer positioned on one surface of the optical layer, a first primer layer positioned on the base layer, and a first protrusion positioned on the first primer layer. The optical layer is formed by alternately stacking two or more materials having different refractive indices, The thickness of the first primer layer is 5 to 300nm, The first protruding portion has a prism shape including a peak and a valley, and an average height difference of the peaks is 1 to 20 μm. The method of claim 11, The mountain of the first protrusion has a zigzag shape in which left and right are random, and the average horizontal amplitude of the mountain is 1 to 20 μm. The method of claim 11, The valley of the first protrusion has a zigzag shape in which left and right are random, and the average horizontal amplitude of the valley is 1 to 20 μm.

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