KR102482610B1 - Display device - Google Patents

Abstract

The display device according to the present invention is characterized in that any one of the optical sheets located on the rear surface of the display panel is folded to perform the role of a conventional guide panel, that is, light blocking and light leakage prevention and backlight unit storage. there is
In addition, a conventional light emitting diode printed circuit board is formed in a multi-layer structure and bent based on the surface on which the light emitting diode package is disposed, thereby reducing the size of the bezel by the area occupied by the light emitting diode package.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device having a narrow bezel.

Active matrix type liquid crystal displays are being applied to almost all display devices, from small mobile devices to large TVs, due to their low price and high performance thanks to the development of process technology and driving technology.

A liquid crystal display device includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix form, a driving circuit for driving the liquid crystal panel, and a backlight unit for irradiating light to the liquid crystal panel. The backlight unit is classified into a direct type type and an edge type type depending on the location of a light source. The direct type method is a method of arranging a light source on the rear surface of the liquid crystal panel, and the edge type method is a method of disposing the light source on the side surface of the liquid crystal panel. As a light source of the backlight unit, a fluorescent lamp such as a CCFL or a light emitting diode is used. In particular, the light emitting diode has the advantages of high brightness and low power consumption, and thus is attracting attention as a next-generation light source of the backlight unit.

Recently, manufacturers of display devices are conducting various studies to implement a narrow bezel. Narrow bezel technology is a technology that enhances aesthetics by reducing the bezel on which images are not displayed and increasing the display area in the same area.

1 is a cross-sectional view showing a light-incident surface of a conventional general display device, and FIG. 2 is a cross-sectional view showing a non-light-incident surface of a conventional general display device.

Referring to FIGS. 1 and 2 , a conventional display device includes a display panel 10, a guide panel 20 supporting the display panel 10, and a light emitting diode chip disposed under the display panel 10 ( 33) as a light source.

The display panel 10 includes an upper substrate 12 , a lower substrate 14 , and a liquid crystal layer filled between the upper and lower substrates 12 and 14 . The display panel 10 displays an image by controlling light transmittance of liquid crystal molecules having dielectric anisotropy using an electric field.

The guide panel 20 has a frame shape and supports an edge area of the display panel 10 . The guide panel 20 has a stepped surface for supporting the flexible printed circuit board 35 of the backlight unit 30 .

The backlight unit 30 includes a light guide plate 31 disposed below the display panel 10, an LED 33 disposed on a side surface of the light guide plate 31, and a flexible printed circuit board on which the LEDs 33 are mounted. (35), a reflective film (37) disposed on the rear surface of the light guide plate (31), and at least one optical sheet (39) disposed on the upper surface of the light guide plate (31).

A plurality of light emitting diode chips 33 are mounted on the rear surface of the flexible printed circuit board 35 . The flexible printed circuit board 35 has one side attached to the stepped surface of the guide panel 20 and the other side attached to the upper surface of the light guide plate 31 based on the area where the LEDs 33 are mounted.

However, in the conventional display device as described above, it is difficult to reduce the width of the bezel area where the light emitting diode chip 33 is disposed among the bezel areas corresponding to each edge area of the display panel 10 . The reason is that, in the case of the bezel area where the light emitting diode chip 33 is disposed, a margin for accommodating the light emitting diode chip 33 is required excluding the width of the guide panel 20 . In addition, the flexible printed circuit board 35 has wiring designed not only on the other side attached to the light guide plate 31 but also on one side attached to the stepped surface of the guide panel 20 . Therefore, since the guide panel 20 must secure an area for supporting one side of the flexible printed circuit board 35, there is a limit to reducing the width of the guide panel 20.

As such, since the width of the bezel area where the LEDs 33 are disposed in the liquid crystal display device has to be wider than the rest of the bezel areas, further research is needed to reduce the width of the bezel area where the LEDs 33 are disposed.

Therefore, the inventors of the present invention have devised a novel structure in which the guide panel 20 is removed in order to implement a narrow bezel.

The contents of the background art described above are technical information that the inventor of the present application possessed for derivation of the present invention or acquired in the process of derivation of the present invention, and must be known art disclosed to the general public prior to filing the present invention. can't

The present invention has been devised to solve the above-mentioned problems in the related art, and a technical task is to implement a narrow bezel by deleting a guide panel.

In addition, it is also a technical task to realize a narrow bezel by bending a light emitting diode printed circuit board.

In addition, another technical challenge is to implement a narrow bezel by providing an optical sheet having a novel structure that can replace the guide panel.

In order to achieve the above object, the display device according to the present invention folds one of the optical sheets to perform the role of a conventional guide panel, that is, to block and prevent light from leaking and to accommodate a backlight unit. It has a characteristic.

In addition, a conventional light emitting diode printed circuit board is formed in a multi-layer structure and bent based on the surface on which the light emitting diode package is disposed, thereby reducing the size of the bezel by the area occupied by the light emitting diode package.

According to the present invention as described above, there are the following effects.

First, since the thickness occupied by the guide panel can be reduced by removing the guide panel, a display device with improved aesthetics can be obtained by implementing a narrow bezel.

Second, the effect of simplifying the assembly process can be obtained by deleting the guide panel.

Third, by removing the guide panel, it is possible to obtain effects of reducing component cost and reducing the weight of the display device.

1 is a cross-sectional view showing a light incident surface of a conventional general display device.
2 is a cross-sectional view showing a non-light incident surface of a conventional general display device.
3 is a perspective view of a display device according to the present invention.
4 is a perspective view showing an optical sheet according to the present invention.
5 is a perspective view showing a folded state of the optical sheet shown in FIG. 4;
6 is a cross-sectional view showing a light incident surface of a display device according to an embodiment of the present invention.
7 is a cross-sectional view showing a non-light incident surface of the display device according to the present invention.
8 is a perspective view showing an optical sheet according to a second embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only the present embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative, so the present invention is not limited to the details shown. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal precedence relationship is described in terms of 'after', 'following', 'next to', 'before', etc. It can also include non-continuous cases unless is used.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each embodiment can be implemented independently of each other or can be implemented together in a related relationship. may be

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

3 is a perspective view of a display device according to the present invention.

Referring to FIG. 3 , the display device 100 according to the present invention includes a display panel 110, a light guide plate 120, a reflector 130, optical sheets 140, a light emitting diode printed circuit board 150, and a light blocking tape ( 160).

The display panel 110 displays an image by using light irradiated from a light source module, and includes a lower substrate 111, an upper substrate 113, and a lower polarizing member bonded to each other with a liquid crystal layer (not shown) interposed therebetween. (115), and an upper polarization member (117).

The lower substrate 111 is a thin film transistor array substrate, and includes a pixel array having a plurality of pixels (not shown) formed in each pixel area crossed by a plurality of gate lines (not shown) and a plurality of data lines (not shown). include Each pixel may include a thin film transistor (not shown) connected to a gate line and a data line, a pixel electrode connected to the thin film transistor, and a common electrode formed adjacent to the pixel electrode to which a common voltage is supplied.

A pad part connected to each signal line is provided at one edge of the lower substrate 111, and the pad part is connected to a panel driving circuit part. In addition, a gate driving circuit (not shown) for supplying a gate (or scan) signal to a gate line is formed in a vertical non-display area of the lower substrate 111 . A gate driving circuit is formed along with the manufacturing process of the thin film transistor of each pixel so as to be connected to each gate line.

The upper substrate 113 includes a pixel definition pattern defining an opening area overlapping each pixel area formed on the lower substrate 111 and a color filter formed in the opening area. The upper substrate 113 is oppositely bonded to the lower substrate 111 with the liquid crystal layer interposed therebetween by a sealant.

The liquid crystal layer is interposed between the lower substrate 111 and the upper substrate 113, and the arrangement direction of the liquid crystal molecules is changed according to an electric field formed by a data voltage and a common voltage applied to the pixel electrode for each pixel. made up of

The lower polarization member 115 is attached to the lower surface of the lower substrate 111 and polarizes light incident from the light source module along a first polarization axis to irradiate the lower substrate 111 with light.

The upper polarizing member 117 is attached to the upper surface of the upper substrate 113 and polarizes light transmitted through the upper substrate 113 and emitted to the outside. The upper polarizing member 117 according to an example is a polarizing film that is attached to the upper surface of the upper substrate 113 and polarizes color light transmitted through the upper substrate 113 and emitted to the outside to a second polarization axis different from the first polarization axis. It can be done. The upper polarizing member 117 according to another example separates the polarizing film and a 3D image, that is, a left-eye image and a right-eye image, attached to an upper surface of the polarizing film and displayed on the display panel 110, into different polarization states. It may be configured to include a retarder film (not shown).

As such, the display panel 110 drives the liquid crystal layer according to the electric field formed for each pixel by the data voltage and the common voltage applied to each pixel, thereby displaying a predetermined color image according to light passing through the liquid crystal layer. .

The light guide plate 120 propagates the light emitted from the light source module toward the rear surface of the display panel 110 . The light guide plate 120 has a rectangular shape when viewed from the front, and has a rectangular parallelepiped structure including six faces when viewed three-dimensionally. Therefore, if each surface of the light guide plate 120 is defined, the light exit surface 121 located on the rear surface of the display panel and emitted light, the lower surface 122 in contact with the reflector 130, and the light entrance surface facing the light source module ( 123), a non-light-incident surface 124 opposite to the light-incident surface, and a first side surface 125 and a second side surface 126 connecting the light-incident surface 123 and the non-light-incident surface 124.

The non-light incident surface 124 of the light guide plate 120 includes a protrusion, and the protrusion includes an upper protrusion 124a and a lower protrusion 124b. The protruding structure of the light guide plate 120 may replace the function of a conventional guide panel.

That is, the protrusions 124a and 124b may perform a role of fixing various sheets including the reflector 130 so that they may be disposed in appropriate positions. When an external force is applied to the display device, optical defects of the display device may be prevented by fixing various sheets including the reflector 130 so as not to deviate from a predetermined position.

In addition, instead of the conventional structure in which the protrusions 124a and 124b are bonded to the display panel 110 through a guide panel, a transparent tape is disposed on the optical sheets 140 positioned on the upper surface of the upper protrusion 124a to display the display. It is possible to secure the space attached to the panel. However, the light blocking function, which is one of the roles of the conventional guide panel, cannot be performed by the light guide plate 120, but the light blocking function of preventing light leakage can be supplemented through the light blocking film 160 to be described later.

The reflector 130 is disposed on the lower surface of the light guide plate 120, that is, the lower surface 122 of the light guide plate 120, and reflects the light incident from the light guide plate 120 toward the light guide plate 120, thereby reflecting the back surface of the light guide plate 120. Minimizes the loss of light passing through.

The optical sheets 140 are disposed on the light guide plate 120 to improve luminance characteristics of light emitted from the light guide plate 120 . For example, the optical sheets 140 may include, but are not limited to, a diffusion sheet, a prism sheet, and a dual brightness enhancement film. It may be made of a laminated combination of two or more selected from a film (dual brightness en-hancement film) and a lenticular sheet. The optical sheets 140 will be described later with reference to FIGS. 4 and 5 .

The light emitting diode printed circuit board 150 may include a light emitting diode package 152, a light emitting diode chip 153, and an encapsulation layer 154, and emits a light source driving signal provided from the outside through a connector 157. supplied to the diode chip 153. The light emitting diode printed circuit board 150 may be a flexible printed circuit board, and in the present invention, for convenience of explanation, the light emitting diode printed circuit board 150 is a flexible printed circuit board. I'm going to do it. Hereinafter, the light emitting diode printed circuit board 150, the light emitting diode package 152, the light emitting diode chip 153, and the encapsulation layer 154 are defined as a light source module. The light emitting diode printed circuit board 150 will be described later with reference to FIGS. 6 and 7 .

The light blocking film 160 may be disposed on the rear surface of the uppermost sheet of the optical sheet 140 to be described later, and may be provided to surround the optical sheet 140 and the light emitting diode printed circuit board 150 . In this case, the light blocking film 160 is not disposed on the rear surface of the optical sheet 140 overlapping the display area where the image is displayed.

The light blocking film 160 prevents light leakage by absorbing light incident from the surroundings. In addition, the light blocking film 160 serves to fix the optical sheet 140 . That is, since the light blocking film 160 of the present invention replaces the light blocking function, which is one of the roles of the conventional guide panel, it is possible to minimize light loss by blocking light that may leak from the side of the light guide plate 120 .

The light blocking film 160 according to an example includes the light blocking film 160 disposed on the light incident surface 121 of the light guide plate and the light blocking film 160 disposed on the non light incident surface 124 of the light guide plate 120 shown in FIG. may have different sizes. Since the guide panel of the light blocking film 160 disposed on the non-light-incident surface 124 of the light guide plate 120 is removed, a light leakage phenomenon in which the light path is deviated from the protrusions 124a and 124b of the light guide plate 120 may occur. can Accordingly, the light blocking film 160 disposed on the non-light incident surface 124 of the light guide plate 120 may be disposed to cover a portion of the lower surface 122 of the light guide plate 120 .

In contrast, since the light blocking film 160 disposed on the light incident surface 123 of the light guide plate 120 covers the lower surface 122 of the light guide plate with the light emitting diode printed circuit board 150, there is a concern that light leakage may occur. there is no Therefore, the light blocking film 160 disposed on the light incident surface 123 of the light guide plate 120 overlaps the optical sheets 140 and the light incident surface 123 of the light guide plate 120 with the light emitting diode package 152. It may be arranged to cover a part of the area.

Similarly, the light blocking film 160 may be disposed on the first and second side surfaces 125 and 127 of the light guide plate 120 to prevent light leakage.

4 is a perspective view showing an optical sheet according to the present invention, and FIG. 5 is a perspective view showing a folded structure of the optical sheet shown in FIG. 4 .

Referring to FIG. 4 , a plurality of optical sheets 140 may be included, and the optical sheets 140 according to the present invention may include three optical sheets. For example, the third optical sheet 145 disposed on the upper surface of the light guide plate 120, the second optical sheet 143 disposed on the upper surface of the third optical sheet, and the uppermost sheet disposed on the second optical sheet 143 It may be composed of the first optical sheet 141 constituting the.

The first optical sheet 141 may be any one selected from a diffusion sheet, a prism sheet, a dual brightness enhancement film, and a lenticular sheet.

At this time, when the first optical sheet 141 is folded according to the illustrated dotted line, the first bending area 141a facing the light emitting surface 121 of the light guide plate 120 faces the lower surface 122 of the light guide plate. The second bending region 141b for viewing The third bending region 141c facing the light incident surface 123 and the non-light incident surface 124 of the light guide plate and facing the first side surface 125 and the second side surface 126 of the light guide plate A fourth bending region 141d is included. However, this is for convenience of explanation, and the optical sheet 140 including the first to fourth bent regions 141a to 141d is not limited to the first optical sheet 141 as an uppermost sheet. For example, according to an example of the present invention, the second optical sheet 143 disposed between the first optical sheet 141 and the third optical sheet 145 includes the first to fourth bending areas 141a to 141a. 141d) may be the optical sheet 140 . In this case, the aforementioned light blocking film 160 may be disposed on the rear surface of the second optical sheet 143 .

The second bending region 141b may have a trapezoidal shape with an end cut at a predetermined angle as shown in the drawing in order to prevent overlapping with another adjacent second bending region 141b. An adhesive member such as a transparent tape may be disposed on the upper surface of the first bent region 141a to be attached to the display panel 110 .

Referring to FIG. 5 , the first optical sheet 141 according to the present invention may have a structure bent in a 'c' shape from the first bending area 141a to the second bending area 141b. Such a structure can replace the role of a conventional guide panel. That is, the first optical sheet 141 is disposed to surround the entire backlight unit including the second and third optical sheets 143 and 145 and can replace a conventional guide panel accommodating the backlight unit.

In this way, if the guide panel is removed using the first optical sheet 141 according to the present invention, the thickness occupied by the conventional guide panel can be reduced, so that a narrow bezel can be implemented to obtain a display device with improved aesthetics. In addition, by eliminating the guide panel, an assembly process can be simplified, and parts costs can be reduced and the weight of the display device can be reduced.

6 is a cross-sectional view showing a light incident surface of the display device according to the present invention, and FIG. 7 is a cross-sectional view showing a non-light incident surface of the display device according to the present invention. In order to avoid redundancy, descriptions of FIG. 3 will be omitted.

Referring to FIG. 6, the light emitting diode printed circuit board 150 according to the present invention has a first area 151 on which the light emitting diode package 152 is mounted and a second area 151 folded to overlap with the first area 151. region 155 and a bending region 156 connecting one side of each of the first region 151 and the second region 155, and one side of each of the first region 151 and the second region 155 may be provided to overlap the light emitting diode package.

That is, the light emitting diode printed circuit board 150 is bent in the direction of the first region 151 by bending an area corresponding to the second region 155 . The second area 155 is bent and then attached to the rear surface of the first area 151. For this purpose, an adhesive tape may be provided on the first and second areas 151 and 155. Also, the first optical sheet 141 may be disposed to cover the second region 155 .

The banding area 156 may be filled with banding ink after the cover lay is removed. Although not shown in the drawings, the light emitting diode printed circuit board 150 may have a cover-lay-removed groove in the bending area 156 . In addition, banding ink may be filled in the groove. The banding ink may be composed of acrylic resin or epoxy-based acrylic resin.

Meanwhile, the length of the second region 155 and the length of the first region 151 of the light emitting diode printed circuit board 150 may be configured differently, but are not limited thereto. For example, the length of the second region 155 may be longer than that of the first region 151 . In this case, the reflector 130 may be attached to the second area 155 . In this case, the reflector 130 may be attached to the second area 155 .

For example, the first and second regions 151 and 156 may have the same length. In this case, the reflector 130 may be attached to the first area 151 .

In this way, when the light emitting diode printed circuit board 150 is composed of first and second regions 151 and 155, and the second region 155 is bent and folded, based on the light emitting diode package 152 Since the area of the light emitting diode printed circuit board 150 disposed outside the bezel is designed to be close to zero, the width of the bezel area can be greatly reduced. Additionally, when the first optical sheet 151 according to the present invention is used, the width of the bezel area can be further reduced because the guide panel is removed as described above.

The light emitting diode chip 153 is mounted on the light emitting diode package 152 . Although not shown in the drawing, the light emitting diode package 152 includes first and second lead electrodes spaced apart at regular intervals and parallel to each other, a mold frame provided at the edges of the first and second lead electrodes to define a light emitting space, and conductive paste. Connecting a first terminal provided on one side of the upper surface of the light emitting diode chip 153 bonded to the first lead electrode and / or the second lead electrode and disposed in the light emitting space by the light emitting diode chip 153 to the first lead electrode It may be made of a second wire connecting the first wire and the second terminal provided on the other side of the upper surface of the light emitting diode chip 153 to the second lead electrode.

The light emitting diode chip 153 may be an Epi Chip emitting light, for example, a blue Epi Chip emitting blue light.

The encapsulation layer 154 may be formed of an encapsulation layer 154 filled in the light emitting space to cover the light emitting diode chip 153 and the first and second wires. The encapsulation layer may be formed to include a phosphor 154a (Phosphor).

The connector 157 is formed at an end of an extension portion extending from the light emitting diode printed circuit board 150 to receive a light source driving signal from the outside.

8 is a perspective view showing an optical sheet according to a second embodiment of the present invention. The second embodiment of the present invention partially changes only the first optical sheet 141 of the first embodiment, and descriptions of overlapping parts will be omitted.

The display device 100 according to the second embodiment of the present invention may include a fourth optical sheet 146 instead of the first optical sheet 141 of the first embodiment described above.

Referring to FIG. 8 , the fourth optical sheet 146 has a fifth bending area 146a facing the light exit surface 121 of the light guide plate 120 and a sixth bending area facing the lower surface 122 of the light guide plate. 146b, a seventh bending region 146c facing the light incident surface 123 and non-light incident surface 124 of the light guide plate, and an eighth bending region facing the first side surface 125 and the second side surface 126 of the light guide plate. (146d).

The sixth bending region 146b may have a trapezoidal shape with an end cut at a predetermined angle as shown in the drawing in order to prevent overlapping with another adjacent sixth bending region 146b.

The fourth optical sheet 146 may be any one selected from a diffusion sheet, a prism sheet, a dual brightness enhancement film, and a lenticular sheet.

A light blocking material 165 may be coated on the rear surface of the fourth optical sheet. That is, the light blocking material 165 may be directly coated on the rear surface of the fourth optical sheet 146 instead of the light blocking film 160 of the first embodiment. The light-blocking material 165 thus coated is a part of the light exit surface 121 of the light guide plate 120, a part of the lower surface 122, the light incident surface 123, the non-light incident surface 124, the first side surface 125, and the second surface. It is arranged to be in contact with the 2 sides (126). That is, the light-blocking material 165 according to the second embodiment of the present invention, like the light-shielding film 160 of the first embodiment, except for a part of the rear surface of the fifth bent region 146a overlapping the display area where an image is displayed, is used. It may be coated on the back surface of the fourth optical sheet 146 . The fourth optical sheet 146 coated with the light blocking material 165 may prevent light leakage from the light guide plate 120 and improve light efficiency.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and may be variously modified and implemented without departing from the technical spirit of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed according to the scope of the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: display device 110: display panel
120: light guide plate 130: reflector
140: optical sheets 141: first optical sheet
142: second optical sheet 143: third optical sheet
144: 4th optical sheet 145: 5th optical sheet
146: sixth optical sheet 150: light emitting diode printed circuit board
151: first area 155: second area
160: light blocking film 165: light blocking material

Claims (11)

optical sheets composed of at least two or more;
a light guide plate disposed on a lower surface of the optical sheet;
a reflector disposed on a lower surface of the light guide plate; and
A light source module for radiating light to the light guide plate,
The light guide plate has a light exit surface contacting the optical sheet, a lower surface contacting the reflector, and a light incident surface connecting the light exit surface and the lower surface;
One of the optical sheets is disposed to cover a light exit surface, a lower surface, and a light incident surface of the light guide plate;
The light source module includes a light emitting diode package for emitting light and a printed circuit board on which the light emitting diode package is mounted,
The printed circuit board
a first region in which the light emitting diode package is mounted;
a second region folded to overlap the first region; and
a bending area connecting one side of each of the first area and the second area;
One side of each of the first region and the second region overlaps the light emitting diode package, the backlight unit. According to claim 1,
The light incident surface of the light guide plate receives the light emitted from the light source module,
The light guide plate further comprises a non-light incident surface facing the light incident surface. delete delete According to claim 1,
The backlight unit further comprises a light blocking film on a rear surface of the optical sheet disposed to cover the light exit surface, the lower surface, and the light incident surface of the light guide plate. According to claim 1,
The backlight unit of claim 1 , wherein a light blocking material is coated on a rear surface of an optical sheet disposed to cover a light exit surface, a lower surface, and a light incident surface of the light guide plate. According to claim 2,
The backlight unit further comprises a protrusion on a non-light-incident surface of the light guide plate that faces the light-incident surface. According to claim 7,
The protrusion supports the optical sheets and includes an upper protrusion and a lower protrusion, the backlight unit. display panel; and
a backlight unit providing light to the display panel;
The backlight unit is a display device according to any one of claims 1, 2, and 5 to 8. optical sheets composed of at least two or more;
a light guide plate disposed on a lower surface of the optical sheet;
a reflector disposed on a lower surface of the light guide plate; and
A light source module for radiating light to the light guide plate,
The light guide plate has a light exit surface contacting the optical sheet, a lower surface contacting the reflector, and a light incident surface connecting the light exit surface and the lower surface;
One of the optical sheets is disposed to cover a light exit surface, a lower surface, and a light incident surface of the light guide plate,
One of the optical sheets includes a first bending area facing the light exit surface of the light guide plate, a second bending area facing the lower surface of the light guide plate, and a third bending area facing the light incident surface and non-light incident surface of the light guide plate. A backlight unit comprising: a region; and a fourth bending region facing the first side and the second side of the light guide plate. According to claim 10,
The backlight unit of claim 1 , wherein the optical sheet has a structure bent in a 'c' shape from the first bending area to the second bending area.

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