WO2010137891A2

WO2010137891A2 - Reflection sheet, light source assembly, and liquid crystal display device comprising same

Info

Publication number: WO2010137891A2
Application number: PCT/KR2010/003371
Authority: WO
Inventors: 최승규; 안철흥; 유수종; 양현이
Original assignee: 신화인터텍 주식회사
Priority date: 2009-05-27
Filing date: 2010-05-27
Publication date: 2010-12-02
Also published as: WO2010137891A3; KR20120001583A; KR101021626B1; KR20100128259A; KR20100130585A

Abstract

The invention relates to a reflection sheet, to a light source assembly, and to a liquid crystal display device comprising same. The reflection sheet comprises: a reflection film for reflecting light incident to one surface thereof; and a base film attached to the reflection film, wherein at least a portion of the reflection film and at least a portion of the base film have different stretching directions.

Description

Reflective sheet, light source assembly and liquid crystal display including the same

The present invention relates to a reflective film, and more particularly, to a reflective film applied to a display, a light source assembly including the same, and a liquid crystal display device.

A liquid crystal display (LCD) is a device that displays an image by injecting a liquid crystal between two glass plates and applying power to the upper and lower glass plate electrodes to change the liquid crystal molecular array in each pixel. Unlike cathode ray tube (CRT), plasma display panel (PDP), and the like, the display by the liquid crystal display itself is non-luminous and thus cannot be used in the absence of light. To compensate for these disadvantages, a light source assembly uniformly irradiated on the information display surface may be mounted for the purpose of enabling use in a dark place.

The light source assembly used in the liquid crystal display device is largely classified into two types. The first is an edge type light source assembly that provides light at the side of the liquid crystal display and the second is a direct type light source assembly that provides light directly at the rear of the liquid crystal display. In the case of an edge-type light source assembly, a light guide plate is provided to allow the light emitted from the light source to be irradiated upward, and at least one optical film is disposed above the light guide plate to adjust optical characteristics of the light passing through the light guide plate, and behind the light guide plate. The reflective sheet may be provided under the LGP to reflect the light emitted into the LGP.

The problem to be solved by the present invention is to provide a reflective sheet that provides an improved image quality through the adhesion of the reflective film and the base film.

Another object of the present invention is to provide a light source assembly including a reflective sheet that provides improved image quality through adhesion of the reflective film and the base film.

Another object of the present invention is to provide a liquid crystal display device including a reflective sheet that provides improved image quality through adhesion of the reflective film and the base film.

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

Reflective sheet according to an embodiment of the present invention for solving the above problems includes a reflective film for reflecting light incident on one surface, and a base film adhered to the reflective film, at least a portion of the reflective film, At least a portion of the base film includes one having a different stretching direction.

Reflective sheet according to another embodiment of the present invention for solving the above problems has a first surface and a second surface opposite to each other, a reflective film for reflecting light incident on the first or second surface, and the reflection And a base pattern formed on the first surface of the film.

Reflective sheet according to another embodiment of the present invention for solving the above problems is a reflective film for reflecting light incident on one surface, the base film adhered to the reflective film, and at least one of the reflective film and the base film It comprises a plurality of beads formed on the surface of the.

Reflective sheet according to another embodiment of the present invention for solving the above problems is a reflective film for reflecting light incident on one surface, the base film adhered to the reflective film, and at least one of the reflective film and the base film And a plurality of beads formed on the surface of the substrate, wherein at least a portion of the reflective film and at least a portion of the base film have different stretching directions.

The light source assembly according to an embodiment of the present invention for solving the other problem includes a reflective sheet as described above.

The liquid crystal display according to the exemplary embodiment of the present invention for solving the another problem includes the reflective sheet as described above.

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

1 is a cross-sectional view of a reflective sheet according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram for explaining a stretching direction of the reflective film and the base film of FIG. 1.

3 to 5 are diagrams of some embodiments of the stretching direction of the reflective film and the base film of FIG. 1.

6 is a view of another embodiment of the stretching direction of the reflective film and the base film of FIG. 1.

FIG. 7 is a view for explaining stretching directions of the reflective film and the base film of FIG. 6.

9 to 12 are cross-sectional views illustrating reflective sheets according to other embodiments of the present invention.

13 is a cross-sectional view for describing a reflective sheet according to another embodiment of the present invention.

14 to 16 are bottom views for describing various embodiments of the reflective sheet of FIG. 13.

17 to 22 are cross-sectional views of reflective sheets according to still other embodiments of the present invention.

23 to 25 are bottom views for explaining an arrangement of a plurality of beads or emboss patterns of the reflective sheet of FIGS. 17 to 22.

26 and 27 are bottom views for explaining an arrangement of a plurality of beads or emboss patterns of the reflective sheets of FIGS. 17 to 22.

28 to 30 are cross-sectional views of reflective sheets according to other embodiments of the present invention.

31 and 32 are cross-sectional views of reflective sheets according to other embodiments of the present invention.

33 to 35 are cross-sectional views for describing various shapes of an embossed pattern.

36 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims.

References to elements or layers "on" other elements or layers include all instances where another layer or other element is directly over or in the middle of another element. On the other hand, when a device is referred to as "directly on", it means that no device or layer is intervened in between. Like reference numerals refer to like elements throughout. "And / or" includes each and all combinations of one or more of the items mentioned.

The spatially relative terms " below ", " beneath ", " lower ", " above ", " upper " It may be used to easily describe the correlation of a device or components with other devices or components. Spatially relative terms are to be understood as including terms in different directions of the device in use or operation in addition to the directions shown in the figures. For example, when flipping a device shown in the figure, a device described as "below" or "beneath" of another device may be placed "above" of another device. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can also be oriented in other directions, so that spatially relative terms can be interpreted according to orientation.

As used herein, the term "~ film" may be used to mean "~ sheet" and "~ plate".

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

First, a reflective sheet according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. 1 is a cross-sectional view of a reflective sheet according to an embodiment of the present invention. FIG. 2 is a conceptual diagram for explaining a stretching direction of the reflective film and the base film of FIG. 1. 3 to 5 are diagrams of some embodiments of the stretching direction of the reflective film and the base film of FIG. 1. 6 is a view of another embodiment of the stretching direction of the reflective film and the base film of FIG. 1. FIG. 7 is a view for explaining stretching directions of the reflective film and the base film of FIG. 6.

Referring to FIG. 1, a reflective sheet 100 according to an embodiment of the present invention includes a reflective film 100 and a base film 300.

The base film 300 supports the reflective film 100. The base film 300 is a transparent material capable of transmitting light, for example, polycarbonate-based, poly sulfone-based, polyacrylate-based, polystyrene-based, poly Polyvinyl chloride-based, poly vinyl alcohol (poly vinyl alcohol), poly norbornene (poly norbornene) may include a material of the polyester (polyester) series. For example, the base film 300 may be made of polyethylene terephtalate, polyethylene naphthalate, or the like.

In some embodiments, the base film 300 may be applied in the form of a rectangular plate. The thickness of the base film 300 may be, for example, about 10 to about 500 μm, and more specifically, about 50 to about 300 μm. However, of course, the thickness of the base film 300 is not limited to the above examples.

The reflective film 100 reflects light. The reflective film 100 may include a reflective layer capable of reflecting light. In this case, the reflective layer may include, for example, titanium oxide, barium sulfate, or the like, and the light reflection phenomenon may occur due to the minute cavity generated thereby. However, the material included in the reflective layer is not limited to the above-described titanium oxide and barium sulfate. The reflective film 100 may be formed in a multilayer structure including a plurality of material layers, which will be described later.

The base film 300 and the reflective film 100 may be adhered to each other, for example, may be adhered to each other via the adhesive layer 200. The adhesive layer 200 may be, for example, a high-transparent adhesive such as a silicone-urethane hybrid structure polymer, an acrylic polymer, a polyester polymer, or the like, but is not limited thereto.

As shown in FIG. 2, at least a portion of the reflective film 100 and at least a portion of the base film 300 may have different stretching directions. As shown in the drawing, when the first stretching direction of the reflective film 100 and the second stretching direction of the base film 300 are displayed on an arbitrary plane S, the stretching direction of the reflective film 100 and The stretching direction of the base film 300 may intersect at a crossing angle α greater than 0 degrees.

Here, the stretching direction may mean a molecular arrangement direction generated by stretching the unstretched film in, for example, the longitudinal and transverse plane directions. At this time, the stretching direction may vary depending on the degree of stretching in the longitudinal direction and the transverse direction, respectively. In some cases, the stretching direction may mean a molecular alignment axis.

More specifically, the first stretching direction of the reflective film 100 and the second stretching direction of the base film 300 are different from each other in the areas where the reflective film 100 and the base film 300 overlap each other. A more detailed description thereof will be described later with reference to FIGS. 6 and 7.

As such, by stacking and forming the reflective film 100 and the base film 300 having different stretching directions, resistance to heat, that is, heat resistance, of the reflective sheet can be enhanced. More specifically, the reflective film 100 and the base film 300 having different stretching directions may be stacked to be resistant to structural deformation of the reflective sheet. Accordingly, the reflective sheet according to the embodiment of the present invention can reduce the sheet recession phenomenon of the reflective sheet by the heat generated from the light source adjacent to the reflective sheet.

Furthermore, referring to FIGS. 3 to 5, the stretching directions of the reflective film 100 and the base film 300 may be variously changed. As illustrated in FIG. 3, the first stretching direction Da1 of the reflective film 100 and the second stretching direction Da2 of the base film 300 may cross each other to form a first crossing angle α1. . In other words, the stretching direction of the reflective film 100 may be in the horizontal axis direction, and the stretching direction of the base film 300 may be in the vertical axis direction. Accordingly, the stretching directions of the reflective film 100 and the base film 300 may perpendicularly cross each other. When the reflective film 100 and the base film 300 are bonded so that the stretching direction of the reflective film 100 and the stretching direction of the base film 300 cross each other perpendicularly, they will have resistance to structural deformation of the reflective sheet. Can be. Accordingly, there is an advantage that can reduce the sheet rim phenomenon of the reflective sheet.

As illustrated in FIG. 4, the first stretching direction Db1 of the reflective film 100 and the second stretching direction Db2 of the base film 300 may cross each other to form a second crossing angle α2. . In other words, the stretching direction of the reflective film 100 may be a horizontal axis direction, and the stretching direction of the base film 300 may be inclined to form a second crossing angle α2 from the horizontal axis direction.

Referring to FIG. 5, the first stretching direction Dc1 of the reflective film 100 and the second stretching direction Dc2 of the base film 300 may cross each other to form a third crossing angle α3. In this case, the first stretching direction Dc1 of the reflective film 100 has a directional upward direction with respect to the horizontal axis direction, and the second stretching direction Dc2 of the base film 300 has a downward direction direction with respect to the horizontal axis direction. Can have

In this case, the stretching direction of the reflective film 100 and the stretching direction of the base film 300 may be different in each region where the reflective film 100 and the base film 300 overlap.

As described above, the reflective sheet to which the base film 300 is adhered to the reflective film 100 having different stretching directions in various ways is improved in heat resistance compared with the reflective sheet composed of the reflective film 100 alone.

Therefore, the sheet-tum phenomenon of the reflective sheet due to heat generation by a light source or the like can be reduced, thereby improving the image quality of the display device to which the reflective sheet according to the embodiments of the present invention is applied.

6 to 8, embodiments in which the reflective film 100 and the base film 300 each have different stretching directions will be described.

As illustrated in FIGS. 6 and 7, the reflective film 100 and the base film 300 may include a plurality of regions having different stretching directions. More specifically, the reflective film 100 includes first to nth regions sequentially arranged with the first to nth (n is one or more natural numbers) stretching directions, respectively, and the base film 300 is first to nth. The mth (m is one or more natural numbers) may include the first to m-th region sequentially arranged in the stretching direction. 6 and 7 exemplarily illustrate a case in which the reflective film 100 and the base film 300 each include three regions, but the reflective film 100 and the base film 300 have different numbers of regions. Of course, it may include.

As shown in FIG. 6, the reflective film 100 includes three first to third regions I, II, and III, and the base film 300 includes three first to third regions I ′. , II ', III'). In other words, the value of n and the value of m may be equal to each other.

In this case, the first to third regions I, II, and III of the reflective film 100 and the first to third regions I ', II', and III 'of the base film 300 correspond to each other. It can be arranged to overlap. In other words, the first region I of the reflective film 100 overlaps the first region I 'of the base film 300, and the second region II of the reflective film 100 is the base film 300. ) And overlap the second region II 'of the ()), and the third region III of the reflective film 100 overlaps the third region III' of the base film 300. As described above, the first to third regions I, II, and III of the reflective film 100 have different first to third stretching directions, respectively, and the first to third regions of the base film 300. (I ', II', III ') may also have different first to third stretching directions.

In the region where the reflective film 100 and the base film 300 overlap each other, the stretching direction of the reflective film 100 and the stretching direction of the base film 300 are different from each other. In other words, the stretching direction of the reflective film 100 and the stretching direction of the base film 300 may cross each other at an angle having an arbitrary size. In this case, the stretching direction of each region of the reflective film 100, that is, the first to third stretching directions and the stretching direction of each region of the base film 300, that is, the first to third stretching directions may be symmetric with each other. .

Here, the overlap between the reflective film 100 and the base film 300 is not only the case where the reflective film 100 and the base film 300 are directly bonded and overlapped with each other, but also the reflective film 100 and the base film 300. ) May be bonded through the first adhesive layer 200.

As shown in FIG. 7, the substrate may include a plurality of regions.

The substrate forming the partial layer and the base film 300 of the reflective film 100 may be at least uniaxially stretched film. For example, the film may be biaxially stretched in the longitudinal direction and the width direction. The substrate may be, for example, a polyester film, and in general, an amorphous sheet obtained by melt extrusion into a sheet shape and quench solidification may be prepared by stretching in the longitudinal direction and the width direction and proceeding with heat treatment. At this time, if the width of the substrate is sufficiently large, the stretching direction formed on the substrate may vary even if the substrate is stretched in a constant strength and direction.

For example, when the substrate is at least uniaxially stretched, the substrate may include a plurality of regions sequentially arranged in the width direction. As illustrated in FIG. 7, the second to fifth regions II to V may be defined symmetrically with respect to the first region, for example, the center region I. Second and third regions II and III and fourth and fifth regions IV and V may be defined at both sides of the first region I. In other words, in the width direction of the substrate, the second region II, the third region III, the fourth region IV, and the fifth region V sequentially from the center region I to both ends of the substrate. Can be defined. The stretching direction of each region may be different from the stretching direction of the adjacent region.

As described above, the strength and direction of the force applied to each position on the substrate may be different depending on the size of the substrate width, and for convenience of description, it is described that the stretching directions of the respective regions are different from each other. The stretching direction in each area may not be the same. In other words, the stretching direction at each point of the substrate may change continuously as it moves toward both ends of the substrate in the central region I. Thus, dividing the substrate into a plurality of regions may mean, for example, grouping the stretching direction changes of the respective points.

Further, when the substrate is stretched with the same strength of force at the end in the width direction of the substrate, the regions facing each other based on the center region I, that is, the second region II, the fourth region IV, and the first region The stretching directions corresponding to the third region III and the fifth region V may be formed to be substantially symmetrical.

In some other embodiments, the stretching ratios corresponding to the second region (II) and the fourth region (IV), and the third region (III) and the fifth region (V) may be formed substantially symmetrically. In other words, the draw ratio of the second region II and the draw ratio of the fourth region IV are substantially the same, and the draw ratio of the third region III and the draw ratio of the fifth region V are substantially the same. The same can be formed. Here, the stretching ratio may mean a ratio of the cross-sectional area of the substrate after stretching to the cross-sectional area of the unstretched substrate. As described above, if the substrate is stretched with the same strength of force at the widthwise end of the substrate, the regions defined symmetrically with respect to the first region I, which is the center region I, that is, the second region The stretching directions corresponding to (II) and the fourth region (IV), and the third region (III) and the fifth region (V) may be substantially the same.

In other words, at least one axial stretching of the substrate constituting the base film 300 and some layers of the reflective film 100, but different stretching directions in the substrate due to factors such as the distance from the point where the stretching force acts This can be determined. In this case, the substrate may include a second region II, a fourth region IV, a third region III, and a fifth region corresponding to each other with respect to the first region I defined at the center of the substrate, that is, the center region. An area V may be defined, and the second to fifth areas II to V may correspond to areas corresponding to each other and a drawing direction or a drawing ratio. More specifically, with respect to the second region (II) and the fourth region (IV) defined symmetrically with respect to the center region (I), the stretching direction of the second region (II) and the third region (III) The stretching direction may be substantially symmetrical. Alternatively, the drawing ratio of the second region II and the drawing ratio of the third region III may be substantially the same. Similarly, the stretching direction of the fourth region IV and the stretching direction of the fifth region V with respect to the fourth region IV and the fifth region V defined symmetrically with respect to the center region I, respectively. May be substantially symmetrical. Alternatively, the stretching ratio of the fourth region IV and the stretching ratio of the fifth region V may be substantially the same.

Referring again to FIG. 6, the relationship between the stretching direction of the reflective film 100 and the stretching direction of the base film 300 will be described in more detail. As illustrated in FIG. 7, the stretching directions of the reflective film 100 and the base film 300 may be determined using a substrate in which a plurality of regions having different stretching directions are defined. For example, the substrate including the first to fifth regions I to V may include the first group I, which includes the first region I, the second region II, and the fourth region IV. II, III, and a second group (I ', II', III ') comprising a first region (I), a third region (III), and a fifth region (V). The second group may be used as the partial layer and the base film 300 of the reflective film 100, respectively.

In arranging the base material of the first group and the base material of the second group, it is possible to arrange so that the regions of the base that correspond to each other overlap each other. For example, when the substrate of the first group constitutes a partial layer of the reflective film 100 and the substrate of the second group constitutes the base film 300, the first region I and the first group of the first group The reflective film 100 such that the first region I ', the second region II', and the third region III 'of the second group overlap the second region II and the third region III, respectively. ) And the base film 300 may be disposed. In other words, the first region I of the reflective film 100 and the first region I ′ of the base film 300 overlap each other, and the second region II of the reflective film 100 and the base film ( The second region II 'of the 300 may overlap each other, and the third region IV of the reflective film 100 and the third region III' of the base film 300 may overlap each other.

In FIG. 6, the first region I, the second region II, and the third region III of the reflective film 100 may include the first region I ′ and the second region (ie, the first region I ′ of the base film 300). II ') and the third region III' are overlapped with each other, but in some other embodiments, the first region I of the reflective film 100 is the first region of the base film 300. A part of (I '), a part of second region II', and a part of third region III 'all overlap, and likewise, second region II and third region of reflective film 100 Also, (III) may be disposed to overlap all of a portion of the first region I ', a portion of the second region II', and a portion of the third region III 'of the base film 300. Relatively speaking, in the arrangement relationship between the reflective film 100 and the base film 300 shown in FIG. 6, either the reflective film 100 or the base film 300 is rotated 90 degrees clockwise or counterclockwise. Can be obtained by rotating.

Accordingly, the stretching direction of the reflective film 100 and the stretching direction of the base film 300 may have different directions and overlap each other. As described above, in the case of the reflective sheet in which the reflective film 100 having the different stretching directions and the base film 300 overlap each other, the sheet sheet phenomenon of the reflective sheet may be reduced with respect to heat generated inside the display device by a light source or the like. There is an advantage. Furthermore, when applied to a display device, a display device with much improved image quality can be provided.

Next, with reference to FIGS. 9-12, the laminated structure of the reflective film 100 and the base film 300 is demonstrated. 9 to 12 are cross-sectional views illustrating reflective sheets according to other embodiments of the present invention.

The reflective sheet according to other embodiments of the present invention is distinguished from the above-described embodiments of the present invention in that it includes a reflective layer 110, a second adhesive layer 120, and a base layer 130. The following description focuses on these differences.

9 to 12, the reflective film 100 includes a reflective layer 110, a second adhesive layer 120, and a base layer 130.

The reflective layer 110 may be an optical functional layer that performs a light reflection function of the reflective film 100. More specifically, the reflective layer 110 may perform a function of improving light efficiency by reflecting light incident on one surface of the reflective film 100 to a member disposed on the reflective film 100, for example, a light guide plate. Can be.

The base layer 130 may be formed on at least one surface of the reflective layer 110 to control surface irregularities of the reflective layer 110 or to protect the reflective layer 110.

Furthermore, the description relating to the stretching direction of the reflective film 100 described above may be substantially the same for the base layer 130 of the reflective sheet according to some embodiments of the present invention. In other words, the contents of the stretching direction of the reflective film 100 described with reference to FIGS. 2 to 7 may be substantially applied to the base layer 130.

More specifically, the stretching direction of the base layer 130 of the reflective film 100 and the stretching direction of the base film 300 may cross each other at an intersection angle greater than 0 degrees, and the first of the base layer 130 The stretching direction and the second stretching direction of the base film 300 may be different in each region where the base layer 130 and the base film 300 overlap each other. As such, by stacking the base layer 130 and the base film 300 having different stretching directions, the reflective sheet may be resistant to heat. Accordingly, there is an advantage that can reduce the sheet rim phenomenon of the reflective sheet due to heat.

In addition, the base layer 130 includes a plurality of regions having different stretching directions, and the base film 300 also includes a plurality of regions having different stretching directions, but the base layer 130 and the base of the reflective sheet In the region where the film 300 overlaps each other, the stretching direction of the base layer 130 and the stretching direction of the base film 300 may be different from each other.

The stretching direction relationship between the base layer 130 and the base film 300 is substantially the same as the stretching direction relationship between the reflective film 100 and the base film 300 described above, and thus a detailed description thereof will be omitted.

The second adhesive layer 120 may be interposed between the reflective layer 110 and the base layer 130 to adhere the two layers to each other. As the second adhesive layer 120, for example, a high-transparent adhesive such as a polymer of a silicone-urethane hybrid structure, an acrylic polymer, a polyester polymer, or the like may be used, but is not limited thereto.

9 and 12, in some embodiments of the present disclosure, the reflective sheet may have a structure in which a reflective film 100 is stacked on an upper portion thereof and a base film 300 is disposed on a lower portion thereof. For example, when the reflective sheet includes a first surface and a second surface, and light is incident on the first surface of the reflective sheet, the reflective film 100 includes the first surface of the reflective sheet, and the base It can be said that the film 300 includes the second surface of the reflective sheet.

In addition, as shown in FIGS. 10 and 11, in some other embodiments of the present disclosure, the reflective sheet may have a structure in which a base film 300 is stacked on top and a reflective film 100 is stacked below. As described above, when the reflective sheet includes a first surface and a second surface, and light is incident on the first surface of the reflective sheet, the base film 300 includes the first surface of the reflective sheet, The reflective film 100 may be said to include the second surface of the reflective sheet.

In other words, the reflective layer 110, the base layer 130, and the base film 300 may be sequentially stacked, and one surface of the reflective layer 110 or one surface of the base film 300 may face the light guide plate. Alternatively, the base layer 130, the reflective layer 110, and the base film 300 are sequentially stacked, and one surface of the base layer 130 or one surface of the base film 300 faces the light guide plate (not shown). can do.

As described above, the reflective film 100 may include a reflective layer 110, a second adhesive layer 120, and a base layer 130. Therefore, as shown in FIGS. 9 to 12, according to the relative arrangement of the reflective film 100 and the base film 300, a reflective sheet having various structures may be formed.

9, the reflective sheet may have a structure in which the reflective layer 110, the base layer 130, and the base film 300 are sequentially stacked from the direction in which light is incident. As described above, the first adhesive layer 200 may be interposed between the reflective film 100 and the base film 300, and the second adhesive layer 120 may be interposed between the reflective layer 110 and the base layer 130. Can be.

Referring to FIG. 10, the reflective sheet may have a structure in which the base film 300, the base layer 130, and the reflective layer 110 are sequentially stacked from the direction in which light is incident. Similarly, the first adhesive layer 200 may be interposed between the reflective film 100 and the base film 300, and the second adhesive layer 120 may be interposed between the reflective layer 110 and the base layer 130. .

Referring to FIG. 11, the reflective sheet may have a structure in which the base film 300, the reflective layer 110, and the base layer 130 are sequentially stacked from the direction in which light is incident. Similarly, the first adhesive layer 200 may be interposed between the reflective film 100 and the base film 300, and the second adhesive layer 120 may be interposed between the reflective layer 110 and the base layer 130. .

Referring to FIG. 12, the reflective sheet may have a structure in which the base layer 130, the reflective layer 110, and the base film 300 are sequentially stacked from the direction in which light is incident. Similarly, the first adhesive layer 200 may be interposed between the reflective film 100 and the base film 300, and the second adhesive layer 120 may be interposed between the reflective layer 110 and the base layer 130. .

Hereinafter, a reflective sheet according to still other embodiments of the present invention will be described with reference to FIGS. 13 to 16. 13 is a cross-sectional view for describing a reflective sheet according to another embodiment of the present invention. 14 to 16 are bottom views for describing various embodiments of the reflective sheet of FIG. 13. The reflective sheet according to still another embodiment of the present invention is distinguished from the above-described embodiments in that the base film is formed in a pattern. The following description will focus on these distinction points.

Referring to FIG. 13, the reflective sheet according to another embodiment of the present invention includes a reflective film 100 and a base pattern 310.

The reflective film 100 is substantially the same as the reflective films of the reflective sheet according to the embodiments described above. More specifically, the reflective film 100 may have a first surface and a second surface opposite to each other, and may reflect light incident on the first or second surface. However, in some embodiments, the stretching direction of the reflective film 100 may be independent of the stretching direction of the base pattern 310 to be described later.

The base pattern 310 is formed on one surface of the reflective film 100. The base pattern 310 may be formed of substantially the same material as the base film of the reflective sheet according to the above-described embodiments. Furthermore, the reflective sheet may be formed without considering the stretching direction of the base pattern 310 and the stretching direction of the reflective film 100.

The base pattern 310 may be formed on one surface of the reflective film 100 to improve structural strength of the reflective sheet. More specifically, by forming the base pattern 310 on one surface of the reflective film 100, the reflective film 100 is to be structurally deformed, for example, to reduce the sheet phenomena due to heat generated by the light source, etc. Can be.

The base pattern 310 may have various shapes and may have a shape as shown in FIGS. 14 and 16. However, the present invention is not limited thereto, and the base pattern 310 having a structure other than that illustrated in the drawing may be formed as long as the pattern is for reducing structural deformation of the reflective film 100.

Next, a reflective sheet according to still other embodiments of the present invention will be described with reference to FIGS. 17 to 22. 17 to 22 are cross-sectional views of reflective sheets according to still other embodiments of the present invention.

The reflective sheet according to still another embodiment of the present invention is distinguished from the above-described embodiments of the present invention in that it includes a plurality of beads disposed on the reflective film or the base film. The following description focuses on these differences. Furthermore, hereinafter, substantially identical components use the same reference numerals, and description thereof will be omitted or simplified.

Referring to FIG. 17, a reflective sheet according to another embodiment of the present invention includes a reflective film 100, a base film 300, and a plurality of beads or emboss patterns 150. More specifically, the reflective sheet according to another embodiment of the present invention is a reflective film 100, a base film 300 formed on one surface of the reflective film 100 and a plurality of formed on the other surface of the reflective film 100 Bead or emboss pattern 150. In addition, as shown in FIG. 17, the reflective film 100 and the base film 300 may be adhered through the first adhesive layer 200.

18 to 22 are cross-sectional views illustrating various stacked structures of the reflective film 100, the base film 300, and the plurality of beads or emboss patterns 150. 18 to 21, the reflective film 100 includes a reflective layer 110, a second adhesive layer 120, and a base layer 130, and the plurality of beads or emboss patterns 150 may include the reflective film 100. ) May be formed on the reflective layer 110 or the base layer 130, or on the base film 300. Furthermore, as shown in FIG. 22, the plurality of beads or emboss patterns 150 are formed on the other surface of the reflective film 100 opposite to one surface of the reflective film 100 to which the base pattern 310 is adhered. Can be.

More specifically, as shown in FIGS. 18 and 22, in some embodiments of the present invention, the reflective sheet may have a structure in which a reflective film 100 is stacked on an upper portion thereof and a base film 300 is stacked on a lower portion thereof. A bead or emboss pattern 150 may be formed on the reflective film 100. In this case, the plurality of beads or emboss patterns 150 are formed on the reflective layer 110 of the reflective film 100 as shown in FIG. 18, or are formed on the base layer 130 as shown in FIG. 19. Can be.

In addition, as shown in FIG. 19 and FIG. 20, in some embodiments of the present invention, the reflective sheet may have a structure in which a base film 300 is stacked on an upper portion thereof and a reflective film 100 is stacked on a lower portion thereof. Beads or emboss patterns 150 may be formed on the base film 300. As described above, since the reflective film 100 may include a laminated structure of the reflective layer 110 and the base layer 130, in some embodiments of the present invention, the reflective sheet may have a plurality of surfaces on one surface of the base film 300. The bead or emboss pattern 150 is formed, the reflective film 100 is formed on the other surface of the base film 300, the base layer 130 on the other surface of the base film 300 as shown in FIG. The second adhesive layer 120 and the reflective layer 110 may be sequentially stacked, and as shown in FIG. 20, the reflective layer 110, the second adhesive layer 120, and the other surface of the base film 300 may be stacked. The base layer 130 may be sequentially stacked.

In another aspect, when the reflective sheet includes a first surface and a second surface, and light is incident on the first surface of the reflective sheet, the reflective film 100 includes the first surface of the reflective sheet, It can be said that the base film 300 includes the second surface of the reflective sheet. In this case, the plurality of beads or emboss patterns 150 may be formed on the first surface of the reflective sheet to which light is incident.

As such, the plurality of beads or emboss patterns 150 formed on the surface of the reflective sheet may generate static electricity by being in close proximity to or in close contact with a member adjacent to the reflective sheet, for example, a light guide plate (not shown) or an optical sheet (not shown). In addition, when friction occurs due to flow, scratches can be prevented from occurring on the surface of the reflective sheet and / or neighboring members.

23 to 25 are bottom views for explaining an arrangement of a plurality of beads or emboss patterns of the reflective sheet of FIGS. 17 to 22. The plurality of beads or emboss patterns 150 may be disposed in a shape as shown in FIGS. 23 to 25, and may be disposed on the reflective layer 110 of the reflective film 100, as shown in FIG. 18, or FIGS. 19 and 20. As shown in FIG. 21, it may be disposed on the base film 300, or as shown in FIG. 21, on the base layer 130 of the reflective film 100. Furthermore, as shown in FIG. 22, the plurality of beads or emboss patterns 150 are formed on the other surface of the reflective film 100 opposite to one surface of the reflective film 100 to which the base pattern 310 is adhered. Can be. In other words, the arrangement of the plurality of beads or emboss patterns shown in FIGS. 23 to 25 may be applied substantially the same to the reflective sheets shown in FIGS. 17 to 22.

In the embodiment of FIG. 23, the plurality of beads or emboss patterns 150 are arranged at equal intervals at positions of a constant matrix. That is, FIG. 23 illustrates an example in which a plurality of beads or emboss patterns 150 are arranged on vertices of a square that are repeatedly arranged. In some other embodiments of the present invention, as shown in FIG. 24, the plurality of beads or emboss patterns 150 may be arranged in an orderly manner.

However, if the distance D of the plurality of beads or emboss patterns 150 is too large, the upper surface of the adjacent member, for example, the light guide plate and the reflective sheet, for example, the reflective film 100 or the base film 300 of the reflective sheet, may be used. ) Is likely to be in close contact with each other, so that the maximum spacing D of the plurality of neighboring beads or emboss patterns 150 is preferably about 1000 μm or less. In addition, if the spacing D of the plurality of beads or emboss patterns 150 is too narrow, the number of the plurality of beads or emboss patterns 150 per unit area increases, thereby occupying the plurality of beads or emboss patterns 150. Since the area becomes wider, optical properties, for example, light reflection properties, may be disadvantageous. Accordingly, the minimum spacing D of the plurality of beads or emboss patterns 150 is preferably about 1 μm or more.

In addition, in consideration of light transmission characteristics, the area occupied by the plurality of beads or emboss patterns 150 may be controlled in the range of 0.001% to 95% of the area of the

entire substrates

100 and 300, more preferably 0.01 It is preferably adjusted in the range of% to 10%. Here, the area occupied by the plurality of beads or emboss patterns 150 may include the diameter of each of the plurality of beads or emboss patterns, the number of the plurality of beads or emboss patterns, the spacing of the plurality of beads or emboss patterns, and the plurality of beads or emboss patterns. Of course, it can be adjusted by the density and the like.

On the other hand, in consideration of both the semi-adhesiveness and the light transmission characteristics, the average distance (D) between a plurality of neighboring beads or embossing patterns may be, for example, about 5㎛ to 500㎛.

Referring to FIG. 25, the plurality of beads or emboss patterns 150 are disposed at different densities according to the center portion CP and both side portions SP that divide the reflective sheet into 1/3. Since the center portion CP is likely to contact a neighboring member, the density of the plurality of beads or emboss patterns 150 is high, while the side portions SP are spaced apart by a seating end (not shown). The density of the plurality of beads or emboss patterns 150 may be relatively low. Although the density of the plurality of beads or emboss patterns 150 may be constant within the same central portion CP, the density of the plurality of beads or emboss patterns 150 may be increased toward the center line as shown in FIG. 25. In addition, in the case of both side portions SP, the closer to the center portion CP, the greater the density of the plurality of beads or emboss pattern 150 may be disposed. As a whole, the plurality of beads or emboss patterns 150 may be disposed to have a higher density as they are closer to the center line. In some other embodiments of the present invention, the plurality of beads or emboss patterns 150 of both side parts SP may be omitted.

26 and 27 are bottom views for explaining an arrangement of a plurality of beads or embossed patterns of the reflective sheets of FIGS. 17 to 21. In the embodiment of FIG. 26, the plurality of beads or emboss patterns 150 may be disposed on a portion of the reflective film 100 or the base film 300 according to the substrate. That is, FIG. 26 illustrates an example in which a plurality of beads or emboss patterns 150 are collectively disposed in some regions of the

substrates

100 and 300. In the drawing, although the plurality of beads or emboss patterns 150 are randomly arranged in some regions, the beads or emboss patterns 150 may be arranged at equal intervals at positions of a predetermined matrix.

In addition, in the embodiment of FIG. 27, the plurality of beads or emboss patterns 150 may be disposed on a plurality of regions of the

substrates

100 and 300. That is, a plurality of beads or embossed pattern regions may be defined on the surfaces of the

substrates

100 and 300, and a plurality of beads or embossed patterns 150 may be collectively disposed in the plurality of beads or embossed pattern regions. In the drawing, although each bead or embossed pattern region is circular and a plurality of bead or embossed pattern regions are defined by the arrangement of triangles, it can be variously modified according to the purpose of the invention.

Reflective sheets according to still another embodiment of the present invention, a plurality of beads or embossed pattern 150 is formed, it may be supported on the reflective sheet by the support coating layer (160, 162, 164). That is, a plurality of beads or emboss patterns 150 are formed on one surface of the reflective sheet. The bead or emboss pattern 150 may include, for example, at least one of an organic material and an inorganic material. Examples of the organic material include homopolymers or copolymers obtained by using monomers such as acryl, styrene, melamine formaldehyde, propylene, ethylene, silicone, urethane, methyl (meth) acrylate, and polycarbonate. Examples of the inorganic material may include silica, zirconia, calcium carbonate, barium sulfate, titanium oxide, and the like.

The plurality of beads 150 or embossed patterns are supported on the

substrates

100 and 300 by the

support coating layers

160, 162 and 164. The

support coating layers

160, 162, and 164 are formed on the other surface of the

substrates

100 and 300 of the reflective sheet to at least partially surround the bead or emboss pattern 150. For example, the

support coating layers

160 and 162 may be formed to surround the entire bead or emboss pattern 150, as shown in FIG. 30, or as shown in FIG. 28, only a part of the bead or emboss pattern 150 is shown. It may be formed to surround. In addition, as shown in FIG. 29, the support coating film 164 may be formed in a pattern shape to surround the bead or emboss pattern 150.

The

support coating layers

160, 162, and 164 may be, for example, thermosetting resins such as acrylic resins, urethane resins, polyester resins, or epoxy acrylate resins, urethane acrylate resins, silicone acrylate resins, acrylic acrylates, and the like. It may be made by including an ultraviolet curable resin such as ester acrylate.

Embodiments having a plurality of beads or emboss patterns on one surface of the reflective sheet, in addition to the effects described above, may further be in close proximity or in close contact with another neighboring optical sheet to generate static electricity, or may be reflected polarizer or other due to friction caused by flow. There is an effect of preventing scratches from occurring in the optical sheet.

Referring to FIG. 31, the reflective sheet according to another embodiment of the present invention includes the reflective film 100, the base film 300, and the adhesion leaving layer 155. The reflective film 100, the base film 300, the first adhesive layer 200, and the like are substantially the same as the above-described embodiments, and the adhesion preventing layer 155 is formed in place of the plurality of beads or the emboss pattern 150. Since they are substantially the same except for the difference that they may be, duplicate description thereof will be omitted.

The adhesion preventing layer 155 includes a reference surface and a plurality of embossed pattern surfaces protruding from the reference surface. The embossed pattern surface of the adhesion preventing layer 155 may function substantially the same as the plurality of beads or the embossed pattern 150 described with reference to FIGS. 17 to 30.

Referring to FIG. 32, a reflective sheet according to another embodiment of the present invention includes a reflective film 100, a base film 300, and an embossed pattern 157. The reflective film 100, the base film 300, the first adhesive layer 200, and the like are substantially the same as the above-described embodiments, and instead of the plurality of beads or emboss patterns 150 or the adhesion preventing layer 155. Since the embossing pattern 157 is substantially the same except for the difference that it may be formed, duplicate description thereof will be omitted.

In some exemplary embodiments, each emboss pattern 157 is formed independently in an island shape, and neighboring emboss patterns 157 are spaced apart by a predetermined interval.

33 to 35 are cross-sectional views for describing various shapes of an embossed pattern. 33 to 35, the embossed pattern 157 may have a three-dimensional shape whose cross section is a rectangle (FIG. 33), a semicircle (FIG. 34), or a trapezoid (FIG. 35). Although not shown in the drawings, some other embodiments may be formed in an amorphous three-dimensional shape. Regardless of the specific shape of the embossed pattern 157, the width of the surface where the embossed pattern 157 is in contact with the other surface of the substrate 100 is defined as the diameter R of the embossed pattern, and the embossed pattern 157 is defined by the substrate 100. When the maximum protruding distance from the other surface of) is defined as the height h of the emboss pattern, the diameter R of the emboss pattern 157 is about 0.1 μm to 100 μm, and the height h of the emboss pattern 157 is About 0.05 μm to 50 μm.

In addition, the embossed pattern 157 may be made of a transparent material.

In some embodiments of the present invention, the emboss pattern 157 has the same or similar hardness as other adjacent optical sheets, optical plates or liquid crystal panels to reduce scratching of other adjacent optical sheets, optical plates, liquid crystal panels, and the like. It may be made of a material having a. Here, having similar hardness includes, for example, a case where the difference in MOS hardness is within 1 range. Within such a range of similar hardness, the scratch can be minimized even when the tip of the embossed pattern 157 comes into contact with another adjacent optical sheet, optical plate, liquid crystal panel, or the like.

In some other embodiments, the embossed pattern 157 may be made of a material having a lower hardness than adjacent members, for example, other optical sheets, optical plates, liquid crystal panels. For example, when the reflective sheet is adjacent to the light guide plate, when the emboss pattern 157 of the reflective sheet is lower in hardness than the adjacent light guide plate, even if mutual friction occurs between the two members, the contact surface of the emboss pattern 157 Although grinding, the surface of adjacent light guide plates hardly scratches. The surface of the substrate 100 of the reflective sheet is also protected from scratch until the embossed pattern 157 is ground and all removed. In view of the above, the embossed pattern 157 may be formed of a material having a MOS hardness of at least one lower than that of an adjacent light guide plate, preferably, a material having a low 1.5 or more, and more preferably a material having a low 2.0 or more.

Also, in some embodiments embossed pattern 157 may comprise a material having a coefficient of friction of 0.35 or less. When the friction coefficient of the embossed pattern 157 is 0.35 or less, even when the tip of the embossed pattern 157 comes into contact with another adjacent member, for example, an optical sheet, an optical plate, a liquid crystal panel, or the like, when pressure is applied from the outside, Since it slips easily at the contact surface, the occurrence of scratches can be minimized. As an example of satisfying the condition of the friction coefficient, the embossed pattern 157 may include a UV curable material and an additive.

Examples of applicable UV curable materials include reactive oligomers such as acrylics, urethanes, polyesters, silicones, esters, and the like, and monofunctional (meth) acrylate monomers or polyfunctional (di, tri) (meth) acrylate monomers. do. As said monofunctional (meth) acrylate or polyfunctional (meth) acrylate monomer, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, tetrahydrofurfuryl (meth), for example Acrylate, butoxy ethyl (meth) acrylate, ethyl diethylene glycol (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, phenoxyethyl (meth) acrylate, di Cyclopentadiene (meth) acrylate, polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, methyl triethylene diglycol (meth) acrylate, isobornyl (meth) acrylate, N-vinylpyrroli Don, N-vinyl caprolactam, diacetone acrylamide, isobutoxymethyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, t-octyl (meth) acrylamide, di Methylaminoethyl (meth) acrylate, acryloylmorpholine, dicyclopentenyl (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) ) Acrylate, ethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, 1,4-butanedioldi (meth) acrylate, 1,6-hexanediol Di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane trioxyethyl (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, dicyclodecane dimethanol di (meth) Acrylate, tripropylene glycol di (meth) acrylate, dicyclopentanedi (meth) acrylate, dicyclopentadienedi (meth) acrylate, and the like, It may be used alone or in mixture of the listed substances.

As the additive, a material having high lubricity may be applied. For example, at least one of a silicon based additive and a fluorine based additive may be applied. Specifically, a reactive monomer or a reactive oligomer having a silicone group (for example, a silicone group-containing vinyl compound, a silicone group-containing (meth) acrylate compound, a (meth) acryloxy group-containing organosiloxane, silicone polyacrylate) Etc.), a reactive monomer or reactive oligomer having a fluorine group (e.g., a fluoroalkyl group-containing vinyl compound, a fluoroalkyl group-containing (meth) acrylate compound, fluorine polyacrylate, etc.), a silicone group or a fluorine group A resin (for example, polydimethylsiloxane, a fluoropolymer, etc.), a surfactant having a silicone group or a fluorine group, an oil (for example, dimethyl silicone oil, etc.) may be applied alone or in combination.

The content ratio of the UV curable material and the additive may range from 100 parts by weight: 0.001 parts by weight to 100 parts by weight: 10 parts by weight, preferably 100 parts by weight: 0.01 parts by weight to 100 parts by weight: 5 parts by weight. .

The embossed pattern 157 may further include a photoinitiator in addition to the UV curable material and the additive. The photoinitiator is one or more free radical initiators selected from benzyl ketals, benzoin ethers, acetophenone derivatives, ketoxime ethers, benzophenones, benzo or thioxanthone compounds, onium salts, ferrocenium salts ( ferrocenium salts, and one or more cationic initiators selected from diazonium salts, or mixtures thereof.

Ensuring the light transmittance of the reflective sheet, and preventing the adhesion between the adjacent optical sheets, the optical plate, and the liquid crystal panel, the antistatic, and the scratch prevention degree together with the constituent materials of the emboss pattern 157 described above, the emboss pattern 157 Can be changed according to the shape, arrangement, and the like.

The reflective sheet described above may be employed in a light source assembly or a liquid crystal display including the same, and used to improve display quality. The light source assembly is classified into a direct type light source assembly in which the lamp is located at the bottom, an edge type light source assembly in which the lamp is located at the side, and the like. The reflective polarizer according to embodiments of the present invention may be employed in any kind of light source assembly. The present invention 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 application examples, a reflective polarizer according to an exemplary embodiment of the present invention is applied to a liquid crystal display including an edge type backlight assembly.

Referring to FIG. 36, a liquid crystal display according to the present invention includes a display panel assembly 400 displaying an image using light, a backlight assembly 700 generating the light, and a backlight assembly 700. One storage container 500 and a top chassis 600 are included.

In more detail, the display panel assembly 400 includes a liquid crystal display panel 410 for displaying the image, a plurality of data side and gate side tape carrier packages (TCP) 420 and 425, and data. Side and gate side printed

circuit boards

430 and 435.

In detail, the liquid crystal display panel 410 includes a thin film transistor substrate (TFT) 411, a color filter substrate 412 that is coupled to the TFT substrate 411 to face each other, and the TFT substrate 411. ) And a liquid crystal layer (not shown) injected between the color filter substrate 412.

The TFT substrate 411 is a transparent substrate in which a switching element TFT (not shown) is formed in a matrix form. The color filter substrate 412 provided to face the TFT substrate 411 is a transparent substrate on which a RGB color pixel, which is a color pixel expressing a predetermined color using the light, is formed by a thin film process.

The plurality of data side TCPs 420 are attached to the source side of the TFT substrate 411. The gate side TCP 425 is attached to the gate side of the TFT substrate 411. The data side and gate side TCPs 420 and 425 apply a driving signal for driving the liquid crystal display panel 410 and a timing signal for controlling the driving timing to the liquid crystal display panel 410.

The data side and gate side TCPs 420 and 425 are connected to the data side and gate side printed

circuit boards

430 and 435, respectively. The data side and gate side printed

circuit boards

430 and 435 generate the driving signal and the timing signal and apply them to the plurality of data side and gate side TCPs 420 and 425, respectively.

The backlight assembly 700 is provided below the display panel assembly 400 to provide uniform light to the liquid crystal display panel 410.

The backlight assembly 700 includes a lamp unit 710 for generating the light, a light guide plate 720 for guiding the path of the light, and optical sheets 730 for uniforming the luminance of the light emitted from the light guide plate 720. The light guide plate 730 includes a reflector 740 and a second storage container 750 for reflecting light leaked from the light guide plate 730.

Specifically, the lamp unit 710 is located at one side of the light guide plate 720 and generates the light in response to a power supplied from the outside.

In the present exemplary embodiment, the backlight assembly 700 includes one lamp unit, but the number of lamp units may be increased according to the size of the liquid crystal display panel 400 and the type of lamp.

The lamp unit 710 may include a lamp 711 generating the light in response to a power supplied from the outside, and a lamp reflector 720 for providing the light incident from the lamp 711 to the light guide plate 720. Equipped.

The lamp reflector 712 surrounds a portion of the lamp 711 and extends in the longitudinal direction of the lamp 711. The lamp reflector 712 is open at the light guide plate 710 side. The lamp reflector 712 reflects light incident from the lamp 711 toward the light guide plate 720 to improve light utilization efficiency.

The light guide plate 720 is positioned under the liquid crystal display panel 410 and is located at one side of the lamp unit 710. The light guide plate 720 changes the path of the light incident from the lamp unit 710 and emits the light to the liquid crystal display panel 410.

The optical sheets 730 are interposed between the light guide plate 720 and the liquid crystal display panel 410. The optical sheets 730 may be provided to the liquid crystal display panel 410 by improving the characteristics of the light incident from the light guide plate 720, for example, brightness increase and brightness uniformity. The optical sheets 730 include a diffusion sheet for diffusing light and a prism sheet for improving luminance.

The reflective plate 740 is provided under the light guide plate 720. The reflective plate 740 reflects the light incident from the light guide plate 720 back to the light guide plate 720 to improve light utilization efficiency. The reflector 740 may apply the reflector according to the embodiments of the present invention described above.

The second storage container 750 is provided below the reflective plate 740. The second accommodating container 750 sequentially accommodates the reflecting plate 740, the light guide plate 720, the lamp unit 710, and the optical sheets 730. The second accommodating container 750 is made of a hard metal material and quickly discharges heat generated from the lamp unit 710 to the outside.

The first accommodating container 500 is disposed between the liquid crystal display panel 410 and the backlight assembly 700. The first accommodating container 500 is made of synthetic resin, and includes a bottom surface of which a portion is opened and a side wall extending from the bottom surface. The first accommodating container 500 is coupled to the second accommodating container 750 so as to face the lamp unit 710, the light guide plate 720, the optical sheets 730, and the reflecting plate 740. It is fixed to the second storage container 750.

The top chassis 600 is provided on the liquid crystal display panel 410. The top chassis 600 covers the liquid crystal display panel 410 so as to open the display area in which the image is displayed, and is coupled to the first and

second storage containers

500 and 750. The top chassis 600 guides the position of the liquid crystal display panel 410 and fixes the liquid crystal display panel 410 to the first storage container 500.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

More detailed information about the present invention will be described through the following specific experimental examples, and details not described herein will be omitted because it is sufficiently technically inferable to those skilled in the art.

Experimental Example

The thermal characteristics of the reflective sheet A and the conventional general reflective sheet B according to an embodiment of the present invention, that is, heat shrinkage and heat expansion, respectively, are measured, and the results are shown in Table 1 below. Shown. Here, the reflective sheet A according to an embodiment of the present invention has a structure in which a reflective film, an adhesive layer, and a base film are stacked, and a plurality of beads are disposed on the reflective film, and the conventional general reflective sheet B is a reflective film. A plurality of beads were formed on the reflective film with a single structure of.

Table 1

Thermal properties		UNIT	A	B
Heat shrink	MD	%	0.3	2.3
Heat shrink	TD	%	0.1	0.7
Heat expansion	MD	cm / cm / ℃	2.3 × 10 ^-5	2.7 × 10 ^-5
Heat expansion	TD	cm / cm / ℃	1.8 × 10 ^-5	2.0 × 10 ^-5

As shown in Table 1 above, the heat shrinkage was tested according to ASTM D1204. Reflective sheet (A) according to an embodiment of the present invention showed a heat shrinkage of 0.3% in the MD direction, 0.1% in the TD direction, while the conventional general reflective sheet (B) 2.3% in the MD direction, The heat shrinkage was 0.7% in the TD direction. Accordingly, it can be seen that the reflective sheet A according to the embodiment of the present invention has a higher resistance than the conventional general reflective sheet B in shrinkage characteristics due to heat.

Likewise, the coefficient of thermal expansion was tested according to ASTM E831. Reflective sheet (A) according to an embodiment of the present invention showed a thermal expansion rate of 2.3 × 10 ^-5 cm / cm / ℃ in the MD direction, 1.8 × 10 ^-5 cm / cm / ℃ in the TD direction, while , Common reflection sheet (B) of the prior art showed a coefficient of thermal expansion of ^{2.7 × 10 -5 cm / cm /} ℃, 2.0 × 10 -5 cm / cm / ℃ in the TD direction in the MD direction. In other words, also in the heat-expanding characteristics, it can be seen that the reflective sheet (A) according to an embodiment of the present invention is more resistant than the conventional general reflective sheet (B).

In conclusion, it was found that the reflective sheet A according to the embodiment of the present invention has a smaller thermal shrinkage rate and thermal expansion rate than the conventional general reflective sheet B. In other words, it can be seen that the reflective sheet A according to the embodiment of the present invention is more resistant to heat than the conventional general reflective sheet B.

Claims

A reflective film reflecting light incident on one surface; And

Including a base film adhered to the reflective film,

At least a portion of the reflective film and at least a portion of the base film has a different stretching direction.
According to claim 1,

The reflective film includes a reflective layer which performs the function of reflecting the light, and a base layer formed on at least one surface of the reflective layer.
The method of claim 2,

The extending direction of the said reflective film is a reflecting sheet of the said base layer.
The method of claim 2,

The reflective layer, the base layer, and the base film are sequentially stacked,

One surface of the reflective layer or one surface of the base film is opposed to the light guide plate.
The method of claim 2,

The base layer, the reflective layer, and the base film are sequentially stacked,

One surface of the base layer or one surface of the base film is opposed to the light guide plate.
The method of claim 2,

The reflective film and the base film are bonded by a first adhesive layer,

The reflective sheet and the base layer is a reflective sheet bonded by a second adhesive layer.
According to claim 1,

The reflective film includes first to nth regions sequentially arranged with first to nth stretching directions, respectively,

And the base film includes first to mth regions sequentially arranged in the first to mth stretching directions, respectively.

(Where n and m are one or more natural numbers)
The method of claim 7, wherein

The value of n and the value of m are the same,

The first to nth regions of the reflective film and the first to mth regions of the base film are respectively disposed to overlap each other,

The first to nth stretching directions of the reflective film are respectively symmetrical to the first to mth stretching directions of the base film.
The method of claim 7, wherein

Each of the first to nth regions of the reflective film is disposed to overlap a portion of each of the first to mth regions of the base film.
A reflective film having a first surface and a second surface opposite to each other and reflecting light incident on the first or second surface; And

And a base pattern formed on the first surface of the reflective film.
The method of claim 10,

A reflective sheet further comprising a plurality of beads or embossed patterns formed on the second surface of the reflective film.
The method of claim 10,

The reflective film includes a reflective layer which performs the function of reflecting the light, and a base layer formed on at least one surface of the reflective layer.
A reflective film reflecting light incident on one surface;

A base film adhered to the reflective film; And

A reflective sheet comprising a plurality of beads or embossed patterns formed on a surface of at least one of the reflective film and the base film.
The method of claim 13,

The reflective film includes a reflective layer which performs the function of reflecting the light, and a base layer formed on at least one surface of the reflective layer.
The method of claim 14,

The reflective layer, the base layer, and the base film are sequentially stacked,

The plurality of beads or embossed patterns are disposed on one surface of the reflective layer or one surface of the base film.
The method of claim 14,

The base layer, the reflective layer, and the base film are sequentially stacked,

The plurality of beads or embossed patterns are disposed on one surface of the base layer or one surface of the base film.
The method of claim 13,

The base film includes a plurality of patterns,

The plurality of beads or embossed pattern is disposed on one surface of the reflective film.
A reflective film reflecting light incident on one surface;

A base film adhered to the reflective film; And

A plurality of beads or embossed pattern formed on the surface of at least one of the reflective film and the base film,

At least a portion of the reflective film and at least a portion of the base film has a different stretching direction.
The method of claim 18,

The reflective film includes a reflective layer which performs the function of reflecting the light, and a base layer formed on at least one surface of the reflective layer.
The method of claim 19,

The reflective layer, the base layer, and the base film are sequentially stacked,

The plurality of beads or embossed patterns are disposed on one surface of the reflective layer or one surface of the base film.
The method of claim 19,

The base layer, the reflective layer, and the base film are sequentially stacked,

The plurality of beads or embossed patterns are disposed on one surface of the base layer or one surface of the base film.
The method of claim 18,

The base film includes a plurality of patterns,

The plurality of beads or embossed pattern is disposed on one surface of the reflective film.
The method of claim 18,

The reflective film includes first to nth regions sequentially arranged with first to nth stretching directions, respectively,

The base film may include first to mth regions sequentially arranged with the first to mth stretching directions, respectively.

(Where n and m are one or more natural numbers)
A light source assembly comprising a reflective sheet according to any one of claims 1 to 25.

The method of claim 23, wherein

The value of n is equal to the value of m,

The first to nth regions of the reflective film and the first to mth regions of the base film are disposed to correspond to each other,

The first to nth stretching directions of the reflective film are respectively symmetrical to the first to mth stretching directions of the base film.
The method of claim 23, wherein

Each of the first to nth regions of the reflective film is disposed to overlap a portion of each of the first to mth regions of the base film.
A light source assembly comprising a reflective sheet according to any one of claims 1 to 25.
A liquid crystal display device comprising the reflective sheet according to any one of claims 1 to 25.