Reflective sheet and display apparatus having the same

A reflective sheet of a display apparatus includes a sheet configured to reflect light; and a beading pattern protruding from a surface of the sheet.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2018-0081856, filed on Jul. 13, 2018, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.

BACKGROUND

The disclosure relates to a reflective sheet used in a display apparatus.

2. Description of the Related Art

A display apparatus is an apparatus that receives an image signal and displays an image, and may include a television, a monitor, and the like.

Such a display apparatus may include a display panel for displaying an image, a backlight for supplying light to the display panel, and a printed circuit board for operating the display panel.

The display apparatus may also include a bottom chassis for supporting the backlight and the printed circuit board.

The backlight may include a reflective sheet for reflecting light emitted from a light source toward the display panel. The reflective sheet may be provided on the top surface of the bottom chassis.

In recent years, the sizes of display panels, backlights, and printed circuit boards have increased and their thickness have become thinner due to the trend toward larger and slimmer display apparatuses.

Therefore, the reflective sheet of the backlight and the bottom chassis have also become larger in size and thinner in thickness.

However, due to the decreased thickness and increased size of the reflective sheet deformation of the reflective sheet has become a problem. For example, in the case of a direct illumination type display apparatus, the reflective sheet of the backlight may shift position with respect to a light source to cover the light source so that the backlight cannot uniformly supply light toward the display panel.

In addition, in the case of an edge illumination type display apparatus, reinforcing beads are formed at portions of the bottom chassis to increase the strength of the bottom chassis. In this case, portions of the reflective sheet corresponding to the portions of the bottom chassis where the reinforcing beads are formed sag into the reinforcing beads, so that the reflective sheet does not sufficiently reflect light toward the display panel.

When the reflective sheet of the backlight does not sufficiently reflect the light, a phenomenon in which the image displayed on the display panel is stained, that is, image stain phenomenon may occur.

SUMMARY

According to an aspect of the disclosure, a reflective sheet of a display apparatus according to an embodiment of the disclosure may include a sheet formed to reflect light; and a beading pattern formed to protrude from one surface of the sheet.

The beading pattern may include a plurality of rectilinear beadings parallel to one side of the sheet.

The beading pattern may include a plurality of dotted beadings parallel to one side of the sheet.

The beading pattern may include a grid pattern beading.

The beading pattern may include one of a plurality of polygonal beadings, a plurality of circular beadings, and a plurality of elliptic beadings.

The reflective sheet for a display apparatus may include a plurality of through holes formed at predetermined intervals on the sheet.

The plurality of through holes may include a plurality of through hole arrays parallel to the one side of the sheet, and the beading pattern may include a plurality of rectilinear beadings that are adjacent to the plurality of through hole arrays and correspond to one-to-one or two-to-one with the plurality of through hole arrays.

The beading pattern may include a grid pattern beading, and each of the plurality of through holes may be positioned within one grid of the grid pattern beading.

The beading pattern may include a plurality of rectangular beadings, and each of the plurality of rectangular beadings may be surrounded by four adjacent through holes forming a rectangle among the plurality of through holes.

The beading pattern may include a plurality of rectangular beadings, and each of the plurality of rectangular beadings may surround four adjacent through holes forming a rectangle among the plurality of through holes.

The beading pattern may include a plurality of circular beadings, and each of the plurality of circular beadings may be surrounded by four adjacent through holes forming a rectangle among the plurality of through holes.

The beading pattern may include a plurality of circular beadings, and each of the plurality of circular beadings may surround four adjacent through holes forming a rectangle among the plurality of through holes.

According to an aspect of the disclosure, a display apparatus may include a light guide plate; a bottom chassis disposed below the light guide plate; and a reflective sheet disposed on a top surface of the bottom chassis, wherein the reflective sheet may include a sheet formed to reflect light; and a beading pattern formed to protrude from one surface of the sheet.

The beading pattern of the reflective sheet may protrude toward the light guide plate.

The beading pattern of the reflective sheet may be concave toward the light guide plate.

The bottom chassis may include a plurality of reinforcing beads, and the beading pattern of the reflective sheet may be disposed at a position corresponding to the plurality of reinforcing beads of the bottom chassis.

The beading pattern may include at least one rectilinear beading across each of the plurality of reinforcing beads.

According to an aspect of the disclosure, a reflective sheet for a display apparatus includes a sheet configured to reflect light; and a beading pattern protruding from a surface of the sheet.

The beading pattern may include a plurality of rectilinear beadings parallel to an edge of the sheet.

Each of rectilinear beading from among the plurality of rectilinear beadings may have a length corresponding to a length of the edge of the sheet.

The beading pattern may include a plurality of dashed beadings parallel to the edge of the sheet.

The beading pattern may include a grid pattern beading.

The beading pattern may include one from among a plurality of polygonal beadings, a plurality of circular beadings, and a plurality of elliptic beadings.

The beading pattern may include a beading, and a cross-section of the beading may be one from among a triangle, a quadrangle, a semicircle, and a semi-ellipse.

The reflective sheet may further include a plurality of through holes formed at predetermined intervals on the sheet.

The plurality of through holes may include a plurality of through hole arrays parallel to the edge of the sheet, the beading pattern may include a plurality of rectilinear beadings, and each rectilinear beading from among the plurality of rectilinear beadings may extend adjacent to a through hole array from among the plurality of through hole arrays such that there is a one-to-one correspondence between the plurality of rectilinear beadings and the plurality of through hole arrays.

The plurality of through holes may include a plurality of through hole arrays parallel to the edge of the sheet, the beading pattern may include a plurality of rectilinear beadings, and for each through hole array from among the plurality of through hole arrays, a first rectilinear beading from among the plurality of rectilinear beadings may extend adjacent to and on a first side of the through hole array and a second rectilinear beading from among the plurality of rectilinear beadings may extend adjacent to and on a second side of the through hole array such that there is a two-to-one correspondence between the plurality of rectilinear beadings and the plurality of through hole arrays.

The beading pattern may include a grid pattern beading, and each through hole from among the plurality of through holes may be positioned within a respective unit square of the grid pattern beading.

The beading pattern may include a plurality of rectangular beadings, and first, second, third, and fourth through holes from among the plurality of through holes may be positioned at respective corners of each rectangular beading from among the plurality of rectangular beadings.

The beading pattern may include a plurality of rectangular beadings, and each rectangular beading from among the plurality of rectangular beadings may surround a respective group of four adjacent through holes to form a rectangle around the respective group of four adjacent through holes.

The beading pattern may include a plurality of circular beadings, and respective first, second, third, and fourth through holes from among the plurality of through holes may form a rectangle around each circular beading from among the plurality of circular beadings.

The beading pattern may include a plurality of circular beadings, and each circular beading from among the plurality of circular beadings may surround a respective group of four adjacent through holes to form a circle around the respective group of four adjacent through holes.

According to an aspect of the disclosure, a display apparatus includes a light guide plate; a bottom chassis disposed below the light guide plate; and a reflective sheet disposed on a top surface of the bottom chassis, wherein the reflective sheet includes a sheet configured to reflect light; and a beading pattern protruding from a surface of the sheet.

The beading pattern of the reflective sheet may protrude toward the light guide plate.

The beading pattern of the reflective sheet may protrude toward the bottom chassis.

The bottom chassis may include a plurality of reinforcing beads, and the beading pattern of the reflective sheet may be disposed at a position on the reflective sheet that overlaps the plurality of reinforcing beads of the bottom chassis in a top-bottom direction of the display apparatus.

For each reinforcing bead from among the plurality of reinforcing beads, the beading pattern may include at least one respective rectilinear beading that extends across the reinforcing bead.

According to an aspect of the disclosure, a display apparatus includes a light guide plate; and a reflective sheet provided behind the light guide plate along a viewing direction of the display apparatus, the reflective sheet including an array of protrusions configured to protrude from a surface of the reflective sheet toward or away from the light guide plate, the array of protrusions forming a corrugated shape in a cross-section of the reflective sheet, wherein the reflective sheet is configured to reflect light such that light exiting a front of the display apparatus along the viewing direction is not transmitted through the reflective sheet.

The array of protrusions may include a plurality of parallel linear protrusions.

The plurality of linear protrusions may extend in a first direction and may be arranged in a second direction perpendicular to the first direction.

The plurality of linear protrusions may form a shape of parallel dashed lines on the surface of the reflective sheet.

The reflective sheet may include a first region and a second region, the first region may include a first linear protrusion from among the array of protrusions, the first linear protrusion having a length similar to a length of an edge of the reflective sheet, and the second region may include a plurality of second linear protrusions from among the array of protrusions, the second linear protrusions forming a shape of collinear dashed lines parallel to the first linear protrusion.

The array of protrusions may form a grid pattern on the surface of the reflective sheet.

The array of protrusions may include a plurality of rectilinear protrusions, each rectilinear protrusion from among the plurality of rectilinear protrusions forming a shape of an outline of a rectangle.

A position of a first row of rectilinear protrusions from among the plurality of rectilinear protrusions may be shifted in a first direction from a position of an adjacent second row of rectilinear protrusions from among the plurality of rectilinear protrusions.

The array of protrusions may include a plurality of rectilinear protrusions, each rectilinear protrusion from among the plurality of rectilinear protrusions forming a shape of an outline of a circle.

A position of a first row of rectilinear protrusions from among the plurality of rectilinear protrusions may be shifted in a first direction from a position of an adjacent second row of rectilinear protrusions from among the plurality of rectilinear protrusions.

The array of protrusions may include a plurality of rectilinear protrusions, each rectilinear protrusion from among the plurality of rectilinear protrusions forming a shape of an outline of an ellipse.

The display apparatus may further include a bottom chassis including a bottom protrusion extending in a first direction, and the array of protrusions may include a first linear protrusion extending across the bottom protrusion of the bottom chassis in a second direction different from the first direction.

The display apparatus may further include a plurality of light sources protruding from the bottom chassis toward the reflective sheet, wherein the reflective sheet further includes an array of through holes through which the plurality of light sources protrude.

The array of through holes may include a plurality of parallel lines of through holes, and the array of protrusions may include a plurality of parallel linear protrusions such that a linear protrusion from among the plurality of parallel linear protrusions is positioned adjacent to and parallel to each respective line of through holes from the plurality of parallel lines of through holes.

The array of through holes may include a plurality of parallel lines of through holes, and the array of protrusions may include a plurality of parallel linear protrusions such that first and second linear protrusions from among the plurality of parallel linear protrusions are positioned on either side of and parallel to each respective line of through holes from the plurality of parallel lines of through holes.

The array of through holes may include a plurality of parallel lines of through holes, a first group of linear protrusions from among the array of protrusions may be formed in a shape of a dashed line on a first side of each respective line of through holes from among the plurality of parallel lines of through holes, and a second group of linear protrusions from among the array of protrusions may be formed in a shape of a dashed line on a second side of each respective line of through holes from among the plurality of parallel lines of through holes.

The array of through holes may include a plurality of through holes arranged in a grid, a first linear protrusion from among the array of protrusions may extend from each through hole from among the plurality of through holes in a first direction to a second through hole from among the plurality of through holes, and a second linear protrusion from among the array of protrusions may extend from each through hole from among the plurality of through holes in a second direction to a third through hole from among the plurality of through holes, the second direction being perpendicular to the first direction.

The array of protrusions may form a grid pattern on the surface of the reflective sheet, and each through hole from among the array of through holes may be positioned in a respective unit square of the grid pattern formed by the array of protrusions.

The array of protrusions may include a plurality of rectilinear protrusions, each rectilinear protrusion from among the plurality of rectilinear protrusions forming a shape of an outline of a rectangle, and first, second, third, and fourth through holes from among the plurality of through holes may be positioned at respective corners of each respective rectilinear protrusion from among the plurality of rectilinear protrusions.

The array of protrusions may include a plurality of rectilinear protrusions, each rectilinear protrusion from among the plurality of rectilinear protrusions forming a shape of an outline of a rectangle, and each rectilinear protrusion from among the plurality of rectilinear protrusion may surround a respective group of four adjacent through holes from among the plurality of through holes to form a rectangle around the respective group of four adjacent through holes.

The array of protrusions may include a plurality of rectilinear protrusions, each rectilinear protrusion from among the plurality of rectilinear protrusions forming a shape of an outline of a circle, and first, second, third, and fourth through holes from among the plurality of through holes may form a rectangle around each respective rectilinear protrusion from among the plurality of rectilinear protrusions.

The array of protrusions may include a plurality of rectilinear protrusions, each rectilinear protrusion from among the plurality of rectilinear protrusions forming a shape of an outline of a circle, and each rectilinear protrusion from among the plurality of rectilinear protrusion may surround a respective group of four adjacent through holes from among the plurality of through holes to form a circle around the respective group of four adjacent through holes.

With a reflective sheet for a display apparatus according to an embodiment of the disclosure having the above-described structure, the rigidity of the reflective sheet may be enhanced. Therefore, the image stain phenomenon of the display apparatus caused by deflection or lifting of the reflective sheet may be improved.

DETAILED DESCRIPTION

Hereinafter, certain embodiments of a reflective sheet and a display apparatus having the same according to the disclosure will be described in detail with reference to the accompanying drawings.

The matters defined herein, such as a detailed construction and elements thereof, are provided to assist in a comprehensive understanding of this description. Thus, it is apparent that example embodiments may be carried out without those defined matters. Also, well-known functions or constructions are omitted to provide a clear and concise description of example embodiments. Further, dimensions of various elements in the accompanying drawings may be arbitrarily increased or decreased for assisting in the comprehensive understanding of this description.

The terms ‘first’, ‘second’, etc. may be used to describe diverse components, but the components are not limited by the terms. The terms may be used merely to distinguish one component from the others. For example, without departing from the scope of the present disclosure, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

The terms used in embodiments of the present disclosure may be construed as commonly known to those skilled in the art unless otherwise defined.

Further, the terms ‘leading end’, ‘rear end’, ‘upper side’, ‘lower side’, ‘top end’, ‘bottom end’, etc. used in the present disclosure are defined with reference to the drawings. However, the shape and position of each component are not limited by the terms.

Hereinafter, a display apparatus according to an embodiment of the disclosure will be described with reference toFIG. 1.

FIG. 1is a cross-sectional view illustrating a display apparatus according to an embodiment of the disclosure.

Referring toFIG. 1, a display apparatus1according to an embodiment of the disclosure may include a display panel10on which an image is displayed, a backlight20configured to supply light to the display panel10, and an optical sheet30disposed between the display panel10and the backlight20and configured to improve the characteristics of light supplied from the backlight20.

The display panel10is formed of a liquid crystal panel and configured to receive light from the backlight20disposed at the rear thereof and to display an image.

The backlight20may include a light guide plate21formed in a rectangular flat plate shape so as to correspond to the shape of the display panel10, a pair of light sources23that are disposed on opposite sides of the light guide plate21and that irradiate light to opposite side surfaces of the light guide plate21, a bottom chassis25that houses the light guide plate21and the pair of light sources23, and a reflective sheet100disposed between the light guide plate21and the bottom chassis25.

The light guide plate21may be formed of a transparent resin material capable of guiding light.

The reflective sheet100is formed of a white resin material or plastic so as to reflect light, and is disposed on the rear surface (i.e., the bottom surface with respect toFIG. 1) of the light guide plate21. Accordingly, the light emitted from the light sources23is incident on the light guide plate21through both side surfaces of the light guide plate21. The light emitted from the rear surface of the light guide plate21is reflected by the reflective sheet100and is discharged to the display panel10through the front surface of the light guide plate21such that light exiting the display panel10in a viewing direction (i.e., in an upward direction with respect toFIG. 1) is not transmitted through the reflective sheet100.

The reflective sheet100according to an embodiment of the disclosure includes a beading pattern103for enhancing rigidity. The reflective sheet100according to an embodiment of the disclosure including the beading pattern103will be described in detail below.

Each of the pair of light sources23includes a plurality of light emitting diodes23aand a substrate23bon which the plurality of light emitting diodes23aare arranged in a line. Each of the substrates23bis formed in a rectangular plate shape having a long length corresponding to a length of a respective side surface of the light guide plate21, and the plurality of light emitting diodes23aare disposed on the substrates23bto face the respective side surfaces of the light guide plate21.

The bottom chassis25may be formed of a metal material so that heat generated from the light sources23or a printed circuit board (not illustrated) may easily be radiated to the outside. The bottom chassis25may include a plurality of reinforcing beads27to increase the rigidity of the bottom chassis25while reducing the thickness of the bottom chassis25.

The optical sheet30improves optical characteristics of light incident on the display panel10, and may include a high luminance prism sheet, a diffuser sheet, and the like.

In addition, although not illustrated, the display apparatus1may include a middle mold for supporting the display panel10, a front chassis disposed in front of the middle mold, a case that forms an outer appearance of the display apparatus1and accommodates the front chassis and the rear chassis25(i.e., the bottom chassis), and a printed circuit board that is disposed inside the case and configured to control the display panel10to display an image.

Hereinafter, the reflective sheet100that may be used in the display apparatus1as illustrated inFIG. 1will be described in detail with reference to the accompanying drawings.

FIG. 2is a plan view illustrating a reflective sheet100for a display apparatus according to an embodiment of the disclosure, andFIG. 3is a partially enlarged cross-sectional view illustrating the reflective sheet for a display apparatus taken along the line I-I inFIG. 2.FIGS. 4A and 4Bare partially enlarged cross-sectional views illustrating the relationship between a reflective sheet and a light guide plate in a display apparatus according to an embodiment of the disclosure.

Referring toFIGS. 2 and 3, the reflective sheet100according to an embodiment of the disclosure may include a sheet101formed to reflect light and a beading pattern103formed to protrude from one surface of the sheet101.

The sheet101is in the form of a rectangular thin film corresponding to the shape of the light guide plate21, and is formed in white so as to reflect light. The sheet101may be formed of a plastic of the polyester type such as polyester terephthalate (PET), polycarbonate (PC), and the like.

The beading pattern103protrudes from one surface of the sheet101and improves the rigidity of the sheet101. In other words, the beading pattern103may be formed as a plurality of protrusions on one surface of the sheet101. The beading pattern may include an array of protrusions forming a corrugated shape in a cross-section of the reflective sheet100. The corrugated shape may include protrusions that are spaced apart from each other with a flat portion of the sheet101extending between the protrusions. The corrugated shape may be formed such that a first surface of the sheet101includes a convex portion and a second surface of the sheet101includes a corresponding concave portion at the same position as that of the convex portion as shown, e.g., inFIG. 3.

For example, as illustrated inFIG. 4A, the beading pattern103may be formed to protrude toward the light guide plate21. Therefore, a concave groove forming the beading pattern103is formed in the opposite surface of the sheet101. The protruding height of the beading pattern103may be made as high as possible without damaging the sheet101when the beading pattern103is formed on the sheet101.

As another example, as illustrated inFIG. 4B, the beading pattern103′ may be formed as a concave groove toward the light guide plate21. In other words, the beading pattern103′ may protrude toward the bottom chassis25instead of the light guide plate21. Therefore, a protrusion protruding downward to form the beading pattern103′ is formed on the opposite surface of the sheet101and a concave groove forming the beading pattern103is formed on the surface of the sheet101that faces the light guide plate21.

The beading pattern103may be formed using a mold. For example, the sheet101is positioned between an upper mold provided with a convex portion corresponding to a punch and a lower mold provided with a concave portion corresponding to the convex portion and then the upper mold is pressed, so that the beading pattern103, which protrudes from one surface of the sheet101and is recessed on the opposite surface of the sheet101, may be formed on the sheet101.

Hereinafter, the reflective sheet100formed so that the beading pattern103protrudes toward the light guide plate21as illustrated inFIG. 4Awill be described. However, the following description may be equally applicable to the reflective sheet100in which the beading pattern103′ is recessed toward the light guide plate21(i.e., protrudes toward the bottom chassis25) as illustrated inFIG. 4B.

The beading pattern103may be formed in various patterns such as a plurality of rectilinear lines, a plurality of rectangles, a plurality of circles, and the like.

The beading pattern103as illustrated inFIG. 2is formed of a plurality of rectilinear beadings parallel to one edge of the sheet101. The plurality of rectilinear beadings103are formed on the sheet101at predetermined intervals. The plurality of rectilinear beadings103may be provided parallel to the longest edge111a(seeFIG. 6, for example) of the sheet101. At this time, each of the plurality of rectilinear beadings103may be formed to have a length corresponding to the length of one edge of the sheet101. Therefore, each rectilinear beading103may extend in the longitudinal direction of the sheet101such that only one rectilinear beading103is formed at each position in the width direction of the sheet101. The plurality of rectilinear beadings103may thus be arranged in the width direction of the sheet101. Here, the longitudinal direction of the sheet101refers to a direction in which the length of the rectangular sheet101is long (X direction inFIG. 2), and the width direction of the sheet101refers to a direction in which the length of the sheet101is short (Y direction inFIG. 2).

Two outermost rectilinear beadings103aand103bamong the plurality of rectilinear beadings103are formed to be spaced apart from the upper edge and the lower edge (with respect toFIG. 2) of the sheet101by a predetermined distance d, respectively. At this time, the distance d between the rectilinear beading103and the upper edge or the lower edge of the sheet101may be set to be equal to or larger than a minimum distance at which the upper edge or lower edge of the sheet101is not deformed as the rectilinear beadings103are formed. Also, opposite ends of each of the plurality of rectilinear beadings103are formed to be spaced apart from opposite side edges of the sheet101by a predetermined distance d1. At this time, the distance d1between the one end of the rectilinear beadings103and the one side edge of the sheet101may be set to be not less than a minimum distance at which the side edge of the sheet101is not deformed as the rectilinear beadings103are formed.

Referring toFIG. 3, the cross-section of each of the plurality of rectilinear beadings103forming the beading pattern103is formed in a substantially semicircular shape. However, the shape of the cross-section of each of the rectilinear beadings103is not limited thereto. The rectilinear beadings103may be formed in various shapes such as a triangle, a quadrangle, a polygon having pentagonal shape or the like so long as the rigidity of the sheet101can be enhanced.

FIGS. 5A, 5B, 5C, 5D, and 5Eare cross-sectional views illustrating cross-sections of various beadings that can be used as a beading pattern of a reflective sheet for a display apparatus according to an embodiment of the disclosure.

FIG. 5Aillustrates a case where the cross-section of the beading104forming the beading pattern is triangular.FIG. 5Billustrates a case where the cross-section of the beading105forming the beading pattern is rectangular.FIG. 5Cillustrates a case where the cross-section of the beading106forming the beading pattern is trapezoidal.FIG. 5Dillustrates a case where the cross-section of the beading107forming the beading pattern is semi-elliptical.FIG. 5Eillustrates a case where the cross-section of the beading108forming the beading pattern is pentagonal.

FIG. 6is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of dotted beadings (i.e., dashed beadings) as a beading pattern.

Referring toFIG. 6, a beading pattern113of a reflective sheet110is formed of a plurality of dotted beadings. Here, the dotted beading113refers to a plurality of rectilinear beads113-1having a short length that are formed at predetermined intervals along the long edge111aof the sheet101. At this time, each of the plurality of dotted beadings113is formed of a plurality of short rectilinear beads113-1having a length shorter than the length of one edge of the sheet111. Therefore, each of the plurality of short rectilinear beads113-1may extend in the longitudinal direction of the sheet111such that multiple rectilinear beads113-1are formed in the longitudinal direction and arranged in the width direction of the sheet111. The plurality of rectilinear beads113-1may each extend parallel to the longitudinal direction.

In a manner similar to the example embodiment shown inFIG. 2, the two outermost dotted beadings113aand113bamong the plurality of dotted beadings113are formed to be spaced apart from the upper edge and lower edge of the sheet111by a predetermined distance, respectively. Also, opposite ends of each of the plurality of dotted beadings113are formed to be spaced apart from opposite side edges of the sheet111by a predetermined distance.

The cross-section of each of the dotted beadings113may be formed to be the same as or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

In the above description, the beading patterns103and113are formed of the plurality of straight lines or the plurality of dotted (i.e., dashed) lines, but the shape of the beading pattern is not limited thereto. The beading pattern may be formed by mixing the plurality of rectilinear beadings and the plurality of dotted beadings.

FIG. 7is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of rectilinear beadings and a plurality of dotted beadings as a beading pattern.

Referring toFIG. 7, a beading pattern123of a reflective sheet120is alternately formed of rectilinear beadings and dotted beadings. The plurality of rectilinear beadings123aand the plurality of dotted beadings123bare formed parallel to one edge of the sheet121.

InFIG. 7, the two rectilinear beadings123aare formed adjacent to the upper edge and the lower edge of the sheet121. However, the rectilinear beadings123amay not be adjacent to the upper edge and the lower edge of the sheet121. Although not illustrated, at least one dotted beading123bmay be formed adjacent to the upper edge or the lower edge of the sheet121, or two dotted beadings123bmay be formed adjacent to the upper edge and the lower edge of the sheet121.

Although the case where the beading patterns103,113, and123are formed of a plurality of straight lines or a plurality of dotted lines has been described above, the shape of the beading patterns is not limited thereto. The beading pattern may be formed in various shapes such as a plurality of polygons, a plurality of circles, a plurality of ellipses, and the like. Hereinafter, a reflective sheet having a beading pattern composed of various shapes will be described.

FIG. 8is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a grid pattern beading as a beading pattern.

Referring toFIG. 8, a beading pattern133of a reflective sheet130is formed of a grid pattern beading133. In other words, a plurality of horizontal rectilinear beadings133aand a plurality of vertical rectilinear beadings133b(with respect toFIG. 8) are formed so as to cross each other at right angles. At this time, the intervals between the plurality of horizontal rectilinear beadings133aand the plurality of vertical rectilinear beadings133bmay be made substantially the same. Alternatively, the intervals between the plurality of horizontal rectilinear beadings133aand the plurality of vertical rectilinear beadings133bmay be different from each other.

In a manner similar to the example embodiment shown inFIG. 2, the four rectilinear beadings forming the edges of the grid pattern beading133are formed to be spaced apart from the upper edge, the lower edge, and both side edges of the sheet131by a predetermined distance. At this time, the predetermined distance may be set to be equal to or larger than a minimum distance at which the edges of the sheet131are not deformed as the grid pattern beading133is formed.

The cross-section of each of the plurality of rectilinear beadings133aand133bforming the grid pattern beading133may be the same or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

FIG. 9is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of rectangular beadings as a beading pattern.

Referring toFIG. 9, a beading pattern143of a reflective sheet140is formed of a plurality of rectangular beadings. The plurality of rectangular beadings143are formed to be spaced apart from each other by a predetermined distance. The plurality of rectangular beadings143are formed to be the same size and extend parallel to the longitudinal direction. The plurality of rectangular beadings are arranged in both the longitudinal direction and the width direction of the sheet141as shown inFIG. 9. The plurality of rectangular beadings may include adjacent rectangular beading arrays143aand143bthat are aligned in the width direction (i.e., the vertical direction with respect toFIG. 9). The rectangular beading array143amay include a rectangular beading143a-1, while the rectangular beading array143bmay include a rectangular beading143b-1.

In a manner similar to the example embodiment shown inFIG. 2, the outermost rectangular beadings143among the plurality of rectangular beadings143are formed to be spaced apart from the edges of the sheet141by a predetermined distance. At this time, the predetermined distance may be set to be equal to or larger than a minimum distance at which the edges of the sheet141are not deformed as the plurality of rectangular beadings143are formed.

The cross-section of the rectilinear beading forming each side of the rectangular beading143may be formed to be the same or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

FIG. 10is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of rectangular beadings as a beading pattern.

Referring toFIG. 10, a beading pattern153of a reflective sheet150is formed of a plurality of rectangular beadings. The plurality of rectangular beadings153are formed to be spaced apart from each other by a predetermined distance on a sheet151. The beading pattern153of the reflective sheet150ofFIG. 10is formed so that two adjacent rectangular beading arrays153aand153bare shifted from each other in the longitudinal direction of the sheet151. In other words, the two adjacent rectangular beading arrays153aand153bare not aligned in the width direction of the sheet151(i.e., the vertical direction with respect toFIG. 10). In contrast, as described above, the beading pattern143of the reflective sheet140ofFIG. 9is different from the beading pattern153ofFIG. 10in that the beading pattern143is formed so that two adjacent rectangular beading arrays143aand143bare formed to be positioned in a straight line in the width direction of the sheet141.

The rectangular beading array153amay include a rectangular beading153a-1, while the rectangular beading array153bmay include a rectangular beading153b-1. As shown inFIG. 10, the rectangular beading153a-1and the rectangular beading153b-1are not aligned in the width direction of the sheet151.

In detail, inFIG. 10, one side of the rectangular beading153b-1of the second rectangular beading array153badjacent to the first rectangular beading array153ais spaced apart by a predetermined distance D from the corresponding side of the rectangular beading153a-1of the first rectangular beading array153ain the longitudinal direction of the sheet151.

FIG. 11is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of circular beadings as a beading pattern.

Referring toFIG. 11, a beading pattern163of a reflective sheet160is formed of a plurality of circular beadings. The plurality of circular beadings163are formed to be spaced apart from each other by a predetermined distance. The plurality of circular beadings163are formed in the same size and are arranged in both the longitudinal direction and the width direction of the sheet161.

In a manner similar to the example embodiment shown inFIG. 2, the outermost circular beadings163among the plurality of circular beadings163are formed to be spaced apart from the edges of the sheet161by a predetermined distance. At this time, the predetermined distance may be set to be equal to or larger than a minimum distance at which the edges of the sheet161are not deformed as the plurality of circular beadings163are formed.

The cross-section of the beading forming the circular beading163may be formed to be the same or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

FIG. 12is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of circular beadings as a beading pattern.

Referring toFIG. 12, a beading pattern173of a reflective sheet170is formed of a plurality of circular beadings. The plurality of circular beadings173are formed to be spaced apart from each other by a predetermined distance on a sheet171. The beading pattern173of the reflective sheet170ofFIG. 12is formed so that two adjacent circular beading arrays173aand173bare shifted from each other in the longitudinal direction of the sheet171. In other words, the two adjacent circular beading arrays173aand173bare not aligned in the width direction of the sheet171(i.e., the vertical direction with respect toFIG. 12). In contrast, as described above, the beading pattern163of the reflective sheet160ofFIG. 11is different from the beading pattern173ofFIG. 12in that the beading pattern163is formed so that two adjacent circular beading arrays163aand163bare formed to be positioned in a straight line in the width direction of the sheet171.

The circular beading array173amay include a circular beading173a-1, while the circular beading array173bmay include a circular beading173b-1. As shown inFIG. 12, the circular beading173a-1and the circular beading173b-1are not aligned in the width direction of the sheet171.

In detail, inFIG. 12, one side end of the circular beading173b-1of the second circular beading array173badjacent to the first circular beading array173ais spaced apart by a predetermined distance D1from the corresponding side end of the circular beading173a-1of the first circular beading array173ain the longitudinal direction of the sheet171.

FIG. 13is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of elliptical beadings as a beading pattern.

Referring toFIG. 13, a beading pattern183of a reflective sheet180is formed of a plurality of elliptical beadings. The plurality of elliptical beadings183are formed to be spaced apart from each other by a predetermined distance. The plurality of elliptical beadings183are formed in the same size and are formed parallel to the longitudinal direction. The plurality of elliptical beadings are arranged in both the longitudinal direction and the width direction of the sheet181.

In a manner similar to the example embodiment shown inFIG. 2, the outermost elliptical beadings among the plurality of elliptical beadings183are formed to be spaced apart from the edges of the sheet181by a predetermined distance. At this time, the predetermined distance may be set to be equal to or larger than a minimum distance at which the edges of the sheet181are not deformed as the plurality of elliptical beadings183are formed.

The cross-section of the beading forming the elliptical beading183may be formed to be the same or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

Although not illustrated, similar to the beading pattern having the plurality of circular beadings173of the reflective sheet170as illustrated inFIG. 12, the beading pattern of the reflective sheet may be formed so that a plurality of elliptical beadings constituting two adjacent elliptical beading arrays are shifted from each other in the longitudinal direction.

As described above, when the beading pattern is formed on the reflective sheet, the reflective sheet may be prevented from sagging into the groove of the reinforcing beads of the bottom chassis when the reflective sheet is provided on the bottom chassis.

Hereinafter, the relationship between the beading pattern of the reflective sheet and the reinforcing beads of the bottom chassis will be described with reference toFIGS. 14A and 14B.

FIG. 14Ais a partially enlarged plan view illustrating a beading pattern of a reflective sheet positioned on a reinforcing bead of a bottom chassis, andFIG. 14Bis a cross-sectional view illustrating the reflective sheet taken along the line II-II inFIG. 14A.

Referring toFIGS. 14A and 14B, a beading pattern193of a reflective sheet190is formed of a plurality of rectilinear beadings. At this time, the plurality of rectilinear beadings193are formed to cross the reinforcing bead27of the bottom chassis25. Therefore, the length L1of each of the plurality of rectilinear beadings193is formed to be larger than the width W of the reinforcing bead27of the bottom chassis25.

When the beading pattern193of the reflective sheet190is formed to cross the reinforcing bead27of the bottom chassis25as described above, the rigidity of the reflective sheet190increases such that the reflective sheet190may be prevented from sagging into the reinforcing bead27of the bottom chassis25.

Although the reflective sheet that can be used in the edge-type display apparatus1as illustrated inFIG. 1has been described above, the reflective sheet according to an embodiment of the disclosure may also be used in a direct-type display apparatus.

Hereinafter, a display apparatus having a reflective sheet according to an embodiment of the disclosure will be described with reference toFIG. 15.

FIG. 15is a cross-sectional view illustrating a display apparatus according to an embodiment of the disclosure.

Referring toFIG. 15, a display apparatus2according to an embodiment of the disclosure may include a display panel10on which an image is displayed, a backlight50configured to supply light to the display panel10, and an optical sheet30disposed between the display panel10and the backlight50and configured to improve the characteristics of light supplied from the backlight50to the display panel10.

The display panel10is formed of a liquid crystal panel and receives light from the backlight50disposed at the rear thereof to display an image.

The backlight50may include a light guide plate51formed in a rectangular flat plate shape so as to correspond to the shape of the display panel10, a plurality of light sources53that are disposed on a top surface of a bottom chassis55below the light guide plate51(i.e., in a downward direction with respect toFIG. 15) and irradiate light toward the light guide plate51, the bottom chassis55that houses the light guide plate51and the plurality of light sources53, and a reflective sheet200disposed on the bottom chassis55.

The light guide plate51is formed of a transparent resin material capable of guiding light.

The reflective sheet200is formed of a white resin material or plastic so as to reflect light, and is disposed below the light guide plate51. Accordingly, some light emitted from the light sources53and the light reflected by the optical sheet30are reflected by the reflective sheet200and then discharged toward the display panel10through the light guide plate51.

As shown inFIG. 16, the reflective sheet200according to an embodiment of the disclosure includes a sheet201, a plurality of through holes202for exposing the plurality of light sources53, and a beading pattern203for enhancing rigidity of the sheet201. The reflective sheet200according to an embodiment of the disclosure including the plurality of through holes202and the beading pattern203will be described in detail below.

The bottom chassis55may be formed of a metal material so that heat generated from the light sources53or a printed circuit board may easily be radiated to the outside. The bottom chassis55may include a plurality of reinforcing beads to increase the rigidity of the bottom chassis55while reducing the thickness of the bottom chassis55.

The optical sheet30is configured to improve optical characteristics of light incident on the display panel10, and may include a high luminance prism sheet, a diffuser sheet, and the like.

Hereinafter, the reflective sheet200that may be used in the display apparatus2as illustrated inFIG. 15will be described in detail with reference to the accompanying drawings.

FIG. 16is a plan view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure used in the display apparatus ofFIG. 15.FIGS. 17A and 17Bare partially enlarged cross-sectional views illustrating the relationship between a reflective sheet and a light guide plate in a display apparatus according to an embodiment of the disclosure.

Referring toFIG. 16, the reflective sheet200according to an embodiment of the disclosure may include a sheet201formed to reflect light and a beading pattern203formed to protrude from one surface of the sheet201.

The sheet201is in the form of a rectangular thin film corresponding to the shape of the light guide plate51, and is has a white color so as to reflect light. The sheet201is provided with a plurality of through holes202so that the plurality of light sources53may be exposed through the through holes202. When the light source53includes a light emitting diode and a lens disposed on the upper side of the light emitting diode, the through holes202may be formed to have a size allowing the lens to pass through.

The plurality of through holes202may be formed in a plurality of through hole arrays202a. The plurality of through hole arrays202amay be formed parallel to one edge of the sheet201, respectively. For example, four through hole arrays202aare illustrated inFIG. 16.

The beading pattern203is formed to protrude from one surface of the sheet201to improve the rigidity of the sheet201.

For example, as illustrated inFIG. 17A, the beading pattern203may be formed to protrude in a direction in which the lens53aof the light source53protrudes. In other words, the beading pattern203may be formed to protrude toward the light guide plate51. Therefore, a concave groove for forming the beading pattern203is formed in the opposite surface of the sheet201.

As another example, as illustrated inFIG. 17B, the beading pattern203′ may be formed as a concave groove in the direction in which the lens53aof the light source53protrudes. In other words, the beading pattern203′ may be formed to be concave toward the light guide plate51. That is, the beading pattern203′ may protrude toward the bottom chassis55. Therefore, a protrusion protruding downward to form the beading pattern203′ is formed on the opposite surface of the sheet201(i.e., the surface of the sheet201facing the light guide plate51).

Hereinafter, the reflective sheet200formed so that the beading pattern203protrudes toward the light guide plate51as illustrated inFIG. 17Awill be described. However, the following description may be equally applicable to the reflective sheet200in which the beading pattern203′ is recessed toward the light guide plate51as illustrated inFIG. 17B.

The beading pattern203as illustrated inFIG. 16is formed of a plurality of rectilinear beadings parallel to one edge of the sheet201. The plurality of rectilinear beadings203are formed on the sheet201at predetermined intervals. Therefore, the plurality of rectilinear beadings203may be formed in parallel with the plurality of through hole arrays202a.

The plurality of rectilinear beadings203may be provided parallel to the longest edge201aof the sheet201. At this time, each of the plurality of rectilinear beadings203may be formed to have a length corresponding to the length of one edge of the sheet201. Therefore, each rectilinear beading203may extend in the longitudinal direction of the sheet201such that only one rectilinear beading203is formed at each position in the width direction of the sheet201. The plurality of rectilinear beadings203may thus be arranged in the width direction of the sheet201. Here, the longitudinal direction of the sheet201refers to a direction in which the length of the rectangular sheet201is long (X direction inFIG. 16), and the width direction of the sheet201refers to a direction in which the length of the sheet201is short (Y direction inFIG. 16).

Two outermost rectilinear beadings203aand203bamong the plurality of rectilinear beadings203are formed to be spaced apart by a predetermined distance d from the upper edge and the lower edge of the sheet201, respectively. At this time, the distance d between the rectilinear beading203aand203band the upper edge or the lower edge of the sheet201may be set to be equal to or larger than a minimum distance at which the upper edge or lower edge of the sheet201is not deformed as the rectilinear beading203is formed. Also, opposite ends of each of the plurality of rectilinear beadings203are formed to be spaced apart by a predetermined distance d1from opposite side edges of the sheet201. At this time, the distance d1between the one end of the rectilinear beadings203and the one side edge of the sheet201may be set to be not less than a minimum distance at which the side edge of the sheet201is not deformed as the rectilinear beading203is formed.

In addition, the rectilinear beadings203are formed to be spaced apart from the through hole arrays202aby a predetermined distance d2. At this time, the distance d2between the rectilinear beadings203and the through hole arrays202amay be set to be equal to or larger than a minimum distance at which the through hole arrays202aare not deformed as the rectilinear beadings203are formed.

Further, the plurality of rectilinear beadings forming the beading pattern203may have a one-to-one correspondence with the plurality of through hole arrays202a. In detail, as illustrated inFIG. 16, one rectilinear beading203ais formed on one side of one through hole array202ain parallel with the through hole array202a. At this time, in addition to the one-to-one correspondence, one more rectilinear beading203bmay be formed adjacent to the lower edge of the reflective sheet200. When the plurality of rectilinear beadings203are formed in this way, there is one rectilinear beading203between every two adjacent through hole arrays202a.

As another example, as illustrated inFIG. 18, the plurality of rectilinear beadings203-1and203-2forming the beading pattern203may have a two-to-one correspondence with the through hole arrays202a. Here,FIG. 18is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of straight beadings as a beading pattern.

In detail, as illustrated inFIG. 18, for each through hole array202a, two rectilinear beadings203-1and203-2are formed on the upper and lower sides of the through hole array202ain parallel with the through hole array202a. In other words, two rectilinear beadings203-1and203-2are disposed on the upper and lower sides, respectively, of each single through hole array202a. Therefore, there are two rectilinear beadings203corresponding to each of the plurality of through hole arrays202aand the two rectilinear beadings203are disposed at the upper and lower sides of the through hole array202ain parallel with each other. When the plurality of rectilinear beadings203are formed in this manner, there are two rectilinear beadings203-1and203-2between every two adjacent through hole arrays202aas shown inFIG. 18.

The cross-section of each of the plurality of rectilinear beadings203may be formed to be the same or similar to the cross-section of each of the plurality of rectilinear beadings103according to the above-described embodiment.

FIG. 19is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of dotted beadings (i.e., dashed beadings) as a beading pattern.

Referring toFIG. 19, a beading pattern213of a reflective sheet210is formed by a plurality of dotted beadings. Here, the dotted beading213refers to a plurality of rectilinear beads213-1having a short length that are formed at predetermined intervals along the through hole arrays212ain the sheet211. At this time, short rectilinear beadings213-1constituting each of the plurality of dotted beadings213may be formed to have a length corresponding to at least two through holes212. InFIG. 19, for example, the short rectilinear beading213-1is formed to have a length substantially similar to the distance between external edges of two adjacent through holes212. In addition, the plurality of dotted beadings213may have a two-to-one correspondence with the plurality of through hole arrays212a, respectively. In other words, for each through hole array212a, two lines of rectilinear beadings213are formed on the upper and lower sides, respectively, of the through hole array212a. However, as another example, although not illustrated, the plurality of dotted beadings213may be formed to correspond one-to-one with the plurality of through hole arrays212a.

At this time, the outermost two dotted beadings213aand213bof the plurality of dotted beadings213are formed to be spaced apart from the upper edge and lower edge of the sheet211by a predetermined distance, respectively. Also, opposite ends of each of the plurality of dotted beadings213are formed to be spaced apart from opposite side edges of the sheet211by a predetermined distance.

In addition, the dotted beading213is formed to be spaced apart from the through hole arrays212aby a predetermined distance. At this time, the distance between the dotted beadings213and the through hole arrays212amay be set to be equal to or larger than a minimum distance at which the through hole array212ais not deformed as the dotted beadings213are formed.

The cross-section of each of the dotted beadings213may be formed to be the same as or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

InFIG. 19, the plurality of dotted beadings forming the beading pattern213are formed on the outside of the through hole array202a. However, the dotted beading may be formed to extend between two adjacent through holes212.

FIG. 20is a view illustrating a reflective sheet for a display apparatus provided with a beading pattern formed of dotted beadings that each extend between two adjacent through holes.

Referring toFIG. 20, dotted beadings forming the beading pattern223of the reflective sheet220are formed between the two adjacent through holes222on the sheet221. The plurality of dotted beadings223may include horizontal dotted beadings223aextending between two horizontally adjacent through holes222and vertical dotted beadings223bextending between two vertically adjacent through holes222. Accordingly, the plurality of dotted beadings223extending between the plurality of through holes222are arranged in a substantially square shape as shown inFIG. 20.

FIG. 21is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a grid pattern beading as a beading pattern.

Referring toFIG. 21, a beading pattern233of a reflective sheet230is formed of a grid pattern beading. In other words, the grid pattern beading233is formed such that a plurality of horizontal rectilinear beadings233aand a plurality of vertical rectilinear beadings233bcross each other at right angles. At this time, the grid pattern beading233may be formed so that each of the plurality of through holes232is located within one grid (i.e., a unit square).

The four rectilinear beadings forming the edges of the grid pattern beading233are formed to be spaced apart from the upper edge, the lower edge, and both side edges of the sheet231by a predetermined distance. At this time, the predetermined distance may be set to be equal to or larger than a minimum distance at which the edges of the sheet231are not deformed as the grid pattern beading233is formed.

In addition, the horizontal rectilinear beadings233aand the vertical rectilinear beadings233bforming the grid pattern beading233are spaced apart from the through holes232by a predetermined distance. At this time, the distances between the horizontal rectilinear beadings233aand the through holes232and between the vertical rectangular beadings233band the through holes232may be set to be equal to or larger than a minimum distance at which the through holes232are not deformed as the grid pattern beading233is formed.

The grid pattern beading233as illustrated inFIG. 21has a structure in which opposite ends of the plurality of vertical rectilinear beadings233bdo not extend beyond the top and bottom horizontal rectilinear beadings233aand opposite ends of the plurality of horizontal rectilinear beadings233ado not extend beyond the leftmost and rightmost vertical rectilinear beadings233b. However, as another example, although not illustrated, the opposite ends of the plurality of vertical rectilinear beadings233bmay be formed to extend beyond the top and bottom horizontal rectilinear beadings233a. The opposite ends of the plurality of horizontal rectilinear beadings233amay be formed to extend beyond the leftmost and rightmost vertical rectilinear beadings233b.

The cross-section of each of the plurality of rectilinear beadings233aand233bforming the grid pattern beading233may be the same or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

FIG. 22is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of rectangular beadings as a beading pattern.

Referring toFIG. 22, a beading pattern243of a reflective sheet240is formed of a plurality of rectangular beadings. Each of the plurality of rectangular beadings243may be formed to be surrounded by four adjacent through holes242forming a rectangle among a plurality of through holes242. In other words, first, second, third, and fourth through holes242are formed at respective corners of each rectangular beading. At this time, the through hole242is not formed in the inside of the rectangular beading243. Accordingly, the plurality of rectangular beadings243are formed to have the substantially same size, and may be arranged in both the longitudinal direction and the width direction of the sheet241.

InFIG. 22, one rectangular beading243is surrounded by four adjacent through holes242forming a rectangle, but the rectangular beading243is not limited thereto. As another example, although not illustrated, one rectangular beading may be surrounded by six or more adjacent through holes242which are arranged in two lines and form a rectangle.

The rectangular beadings243are formed to be spaced apart from the through holes242by a predetermined distance. At this time, the distance between the rectangular beadings243and the through holes242may be set to be equal to or larger than a minimum distance at which the through holes242are not deformed as the plurality of rectangular beadings243are formed.

The cross-section of the rectilinear beading forming each side of the rectangular beading243may be formed to be the same or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

FIG. 23is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of rectangular beadings as a beading pattern.

Referring toFIG. 23, a beading pattern253of a reflective sheet250is formed of a plurality of rectangular beadings. Each of the plurality of rectangular beadings253may be formed to surround four adjacent through holes252forming a rectangle among a plurality of through holes252. In other words, each rectangular beading surround a respective group of four adjacent through holes to form a rectangle around the respective group of through holes. At this time, the four through holes252are present in the inside of the rectangular beading253. Accordingly, the plurality of rectangular beadings253may be formed to have substantially the same size, and may be arranged in both the longitudinal direction and the width direction of the sheet251.

InFIG. 23, one rectangular beading253is formed to surround four adjacent through holes252forming a rectangle, but the rectangular beading is not limited thereto. As another example, although not illustrated, one rectangular beading may be formed to surround six or more adjacent through holes252forming a rectangle.

The rectangular beadings253are formed to be spaced apart from the through holes252by a predetermined distance. At this time, the distance between the rectangular beadings253and the through holes252may be set to be equal to or larger than a minimum distance at which the through holes252are not deformed as the plurality of rectangular beadings253are formed.

The outermost rectangular beadings253among the plurality of rectangular beadings253are spaced apart from the edges of the sheet251by a predetermined distance. At this time, the predetermined distance may be set to be equal to or larger than a minimum distance at which the edges of the sheet251are not deformed as the plurality of rectangular beadings253are formed.

The cross-section of the rectilinear beading forming each side of the rectangular beading253may be formed to be the same or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

FIG. 24is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of circular beadings as a beading pattern.

Referring toFIG. 24, a beading pattern263of a reflective sheet260is formed of a plurality of circular beadings. Each of the plurality of circular beadings263may be formed to be surrounded by four adjacent through holes262forming a rectangle among a plurality of through holes262. In other words, first, second, third, and fourth through holes262form a rectangle around each circular beading. At this time, the through hole262is not formed in the inside of the circular beadings263. Accordingly, the plurality of circular beadings263may be formed to have the substantially same size, and may be arranged in both the longitudinal direction and the width direction of the sheet261.

The circular beadings263are formed to be spaced apart from the through holes262by a predetermined distance. At this time, the distance between the circular beadings263and the through holes262may be set to be equal to or larger than a minimum distance at which the through holes262are not deformed as the plurality of circular beadings263are formed.

The cross-section of the circular beading263may be formed to be the same or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

FIG. 25is a view illustrating a reflective sheet for a display apparatus according to an embodiment of the disclosure having a plurality of circular beadings as a beading pattern.

Referring toFIG. 25, a beading pattern273of a reflective sheet270is formed of a plurality of circular beadings. Each of the plurality of circular beadings273may be formed to surround four adjacent through holes272forming a rectangle among a plurality of through holes272. In other words, each circular beading surrounds a respective group of four adjacent through holes272to form a circle around the respective group of four adjacent through holes272. At this time, the four through holes272are present in the inside of the circular beading273. Accordingly, the plurality of circular beadings273may be formed to have the substantially same size, and may be arranged in both the longitudinal direction and the width direction of the sheet271.

InFIG. 25, one circular beading273is formed to surround four adjacent through holes252forming a rectangle, but the circular beading is not limited thereto. As another example, although not illustrated, one circular beading may be formed to surround six or more adjacent through holes forming a rectangle.

The circular beadings273are formed to be spaced apart from the through holes272by a predetermined distance. At this time, the distance between the circular beadings273and the through holes272may be set to be equal to or larger than a minimum distance at which the through holes272are not deformed as the plurality of circular beadings273are formed.

The cross-section of the circular beading273may be formed to be the same or similar to the cross-section of each of the plurality of rectilinear beadings103as described above.

FIG. 26shows a result of an experiment comparing the rigidity of a reflective sheet for a display apparatus according to an embodiment of the disclosure with that of a conventional reflective sheet.

FIG. 26shows a state in which the deflection of a test piece301of the reflective sheet according to an embodiment of the disclosure is compared with deflection of a conventional test piece302of the reflective sheet according to related art.

The test piece301of the reflective sheet according to an embodiment of the disclosure is formed having a narrow width and a long length and includes a through hole array having a plurality of through holes and two rectilinear beadings formed on respective sides of the through hole arrays as the beading pattern. The conventional test piece302of the reflective sheet according to related art is formed having a narrow width and a long length like the test piece301of the reflective sheet according to the disclosure and includes only one through hole array without including a beading pattern.

The test piece301of the reflective sheet according to an embodiment of the disclosure and the conventional test piece302of the reflective sheet according to related art are protruded by about 15 cm from one end of a support table310as illustrated inFIG. 26, and then the deflection amounts41and42of the test pieces301and302are checked.

As can be seen fromFIG. 26, the deflection amount41of the test piece301of the reflective sheet according to an embodiment of the disclosure is approximately ½ of the deflection amount42of the conventional test piece302of the reflective sheet according to related art. From this result, it can be seen that the rigidity of the reflective sheet according to an embodiment of the disclosure is greater than the rigidity of the reflective sheet according to related art.

Therefore, when the beading pattern is formed on the reflective sheet as in the disclosure, the rigidity of the reflective sheet may be increased. By improving the rigidity of the reflective sheet in this way, the sagging or lifting of the reflective sheet may be prevented or reduced. Therefore, the image stain phenomenon of the display apparatus caused by the sagging and lifting of the reflective sheet may be prevented and image quality may be improved.

While embodiments of the present disclosure have been described, additional variations and modifications of the described embodiments may occur to those skilled in the art. Therefore, it is intended that the appended claims shall be construed to include both the above embodiments and all such variations and modifications that fall within the spirit and scope of the disclosure.