KR102525813B1 - Back light unit and display device comprising it - Google Patents

Abstract

A backlight unit and a display device including the same are disclosed. A backlight unit and a display device of the present invention include a frame including a bottom area and a sidewall area extending from the bottom area, located on at least one part of the frame, and mounting a plurality of light assemblies. A single substrate, a reflective sheet positioned on at least another part of the frame, and an optical sheet positioned on the reflective sheet, wherein the reflective sheet includes cutouts in which both ends of a portion in contact with one side of the substrate are cut. It is characterized by including. According to the present invention, it is possible to provide a display device that is easy to assemble and has a more uniform display screen.

Description

Backlight unit and display device including the same {BACK LIGHT UNIT AND DISPLAY DEVICE COMPRISING IT}

The present invention relates to a backlight unit and a display device including the same.

As the information society develops, the demand for display devices is also increasing in various forms. Display) has been studied and used for various display devices.

Among them, the liquid crystal panel of the LCD includes a liquid crystal layer and a TFT substrate and a color filter substrate facing each other with the liquid crystal layer interposed therebetween, and can display an image using light provided from a backlight unit.

In the prior invention, a lens hole is located at a portion of the reflective sheet corresponding to the lens to cover the substrate. In this case, there is a problem in that light is not uniformly reflected because a space is created between the lens and the reflective sheet.

The present invention aims to solve the foregoing and other problems. Another object is to provide a display device including a backlight unit that is easy to assemble and has a more uniform display screen, and the same.

According to one aspect of the present invention to achieve the above or other object, a frame including a bottom area and a sidewall area extending from the bottom area, located on at least one part of the frame, A substrate on which a plurality of optical assemblies are mounted, a reflective sheet positioned on at least another part of the frame, and an optical sheet positioned on the reflective sheet, wherein the reflective sheet is provided on both sides of a portion in contact with one side of the substrate. It is possible to provide a backlight unit including a cutout portion having a cut end.

One end of the cutout may be located outside the outermost light assembly in a long side direction of the reflective sheet.

The cutout portion may be formed inclined at a predetermined angle with respect to a long side direction of the reflective sheet.

The reflective sheet has a first sheet area corresponding to the bottom surface of the frame, a second sheet area corresponding to the sidewall surface of the frame, and a horizontal bending line and a vertical bending line forming a boundary between the first and second sheet areas. It may contain more lines.

The horizontal bending line and the vertical bending line include a dashed area in which a hole is formed and a central area in which no hole is formed, and a width of the dashed area per unit area may be greater than a width of the central area.

The light assembly may protrude from the substrate in a direction of a short side of the reflective sheet, and the reflective sheet may further include a compensation hole formed in at least a portion of a portion corresponding to the protruding portion.

The reflective sheet may include a first sheet area corresponding to a bottom surface of the frame and a second sheet area corresponding to a sidewall surface of the frame, and a dot area may be formed on at least a part of the second sheet area. .

The reflective sheet may include a first sheet area corresponding to a bottom surface of the frame and a second sheet area corresponding to a sidewall surface of the frame, and a strip area may be formed on at least a part of the second sheet area. .

According to another aspect of the present invention to achieve the above or other object, a frame including a bottom area and a sidewall area extending from the bottom area, located on at least one part of the frame, A substrate on which a plurality of light assemblies are mounted, a reflective sheet positioned on at least another part of the frame, an optical sheet positioned on the reflective sheet, and a display panel positioned on the optical sheet, wherein the reflective sheet includes the It is possible to provide a display device including a cutout portion in which both ends of a portion in contact with one side of a substrate are cut out.

Effects of the backlight unit and the display device including the same according to the present invention are described below.

According to at least one of the embodiments of the present invention, there is an advantage in that it is possible to provide a display device that is easy to assemble and has a more uniform display screen.

A further scope of the applicability of the present invention will become apparent from the detailed description that follows. However, since various changes and modifications within the spirit and scope of the present invention can be clearly understood by those skilled in the art, it should be understood that the detailed description and specific examples such as preferred embodiments of the present invention are given as examples only.

1 to 7 are diagrams showing the configuration of a display device related to the present invention.
9 and 10 are diagrams illustrating a light source according to an embodiment of the present invention.
11 is a diagram illustrating a coupling relationship between a reflective sheet and peripheral components according to an embodiment of the present invention.
12 is a view showing the configuration of a reflective sheet according to an embodiment of the present invention.
13 is a view showing a light assembly positioned on a substrate according to an embodiment of the present invention.
14 to 22 are diagrams showing the configuration of a reflective sheet according to an embodiment of the present invention.
23 and 24 are diagrams illustrating a positional relationship between a reflective sheet and peripheral components according to an embodiment of the present invention.
25 is a view showing the configuration of a reflective sheet according to another embodiment of the present invention.
26 to 32 are diagrams showing dot distribution or strip distribution of a reflective sheet according to an embodiment of the present invention.

Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings, but the same or similar elements are given the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used together in consideration of ease of writing the specification, and do not have meanings or roles that are distinct from each other by themselves. In addition, in describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiment disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes included in the spirit and technical scope of the present invention , it should be understood to include equivalents or substitutes.

Hereinafter, a liquid crystal display device (LCD) will be described as an example of the display panel, but the display panel applicable to the present invention is not limited to the liquid crystal panel, and the plasma display panel (Plasma Display Panel, P), a field emission display (FED), or an organic light emitting display (OLED).

1 to 10 are diagrams showing the configuration of a display device related to the present invention.

As shown in FIG. 1, the display panel 100 below has a first long side (LS1), a second long side (LS2) opposite to the first long side (LS1), and a first long side. It may include a first short side (SS1) adjacent to (LS1) and the second long side (LS2) and a second short side (SS2) opposite to the first short side (SS1).

Here, the first short side area SS1 is referred to as a first side area, and the second short side area SS2 is referred to as a second side area opposing the first side area. One long side area LS1 is referred to as a third side area adjacent to the first side area and the second side area and located between the first side area and the second side area, and the second long side area ( LS2) may be referred to as a fourth side area adjacent to the first side area and the second side area, located between the first side area and the second side area, and opposite to the third side area. .

In addition, although the lengths of the first and second long sides LS1 and LS2 are shown and described as being longer than the lengths of the first and second short sides SS1 and SS2 for convenience of description, the first and second long sides LS1, A case in which the length of LS2 is substantially equal to the lengths of the first and second short sides SS1 and SS2 may also be possible.

In addition, in the following, the first direction (First Direction, DR1) is a direction parallel to the long side (Long Side, LS1, LS2) of the display panel 100, and the second direction (DR2) is the direction of the display panel 100. It may be in a direction parallel to the short side (Short Side, SS1, SS2).

The third direction (DR3) may be a direction perpendicular to the first direction (DR1) and/or the second direction (DR2).

The first direction DR1 and the second direction DR2 may be collectively referred to as a horizontal direction. In addition, the third direction DR3 may be referred to as a vertical direction.

From another point of view, the side on which the display device 10 displays an image may be referred to as the front or front side. When the display device 10 displays an image, the side on which the image cannot be observed may be referred to as the rear or rear side. When viewing the display device 10 from the front or front side, the side of the first long side LS1 may be referred to as an upper side or an upper surface. Similarly, the side of the second long side LS2 may be referred to as a lower side or a lower side. Similarly, the side of the first short side SS1 may be referred to as the left or left side, and the side of the second short side SS2 may be referred to as the right or right side.

In addition, the first long side LS1 , the second long side LS2 , the first short side SS1 , and the second short side SS2 may be referred to as edges of the display device 10 . Also, a point where the first long side LS1 , the second long side LS2 , the first short side SS1 , and the second short side SS2 meet each other may be referred to as a corner. For example, the point where the first long side LS1 and the first short side SS1 meet is the first corner C1, and the point where the first long side LS1 and the second short side SS2 meet is the second corner C2. ), the point where the second short side SS2 and the second long side LS2 meet is the third corner C3, and the point where the second long side LS2 and the first short side SS1 meet is the fourth corner C4. can be

Here, a direction from the first short side SS1 to the second short side SS1 or a direction from the second short side SS2 to the first short side SS1 may be referred to as a left-right direction LR. A direction from the first long side LS1 to the second long side LS2 or from the second long side LS2 to the first long side LS1 may be referred to as a vertical direction UD.

As shown in FIG. 2 , the display device 100 according to the present invention may include a display panel 110 and a back cover 150 behind the display panel 110 .

The back cover 150 may be connected to the display panel 110 in a sliding manner in a direction from the first long side LS1 to the second long side LS2, that is, in the second direction DR2. In other words, the back cover 150 has a first short side SS1 of the display panel 110, a second short side SS2 opposite to the first short side SS1, and the first and second short sides SS1 and SS2. It may be fitted in a sliding manner from the first long side LS1 which is adjacent and positioned between the first short side SS1 and the second short side SS2.

In order to connect the back cover 150 to the display panel 110 in a sliding manner, the back cover 150 and/or other structures adjacent thereto may include a protruding part, a sliding part, a coupling part, and the like.

3 to 7 are diagrams showing the configuration of a display device related to the present invention.

As shown in FIG. 3, the display device 100 according to the present invention may include a front cover 105, a display panel 110, a backlight unit 120, a frame 130, and a back cover 150. there is.

The front cover 105 may cover at least a portion of the front and side surfaces of the display panel 110 . The front cover 105 may have a rectangular frame shape with an empty center. Since the center of the front cover 105 is empty, the image of the display panel 110 can be displayed outside.

The front cover 105 may be divided into a front cover and a side cover. That is, it means that it can be divided into a front cover located on the front side of the display panel 110 and a side cover located on the side side of the display panel 110. The front cover and the side cover may be configured separately. Either one of the front cover and the side cover may be omitted. For example, for the purpose of a beautiful design, it means that it may be possible to have only a side cover without a front cover.

The display panel 110 is provided on the front of the display device 100 and can display images. The display panel 110 may divide an image into a plurality of pixels and output the image by adjusting color, brightness, and saturation for each pixel. The display panel 110 may be divided into an active area where an image is displayed and an inactive area where an image is not displayed. The display panel 110 may include a front substrate and a rear substrate facing each other with a liquid crystal layer therebetween.

The front substrate may include a plurality of pixels composed of red (R), green (G), and blue (B) sub-pixels. The front substrate may generate images corresponding to red, green, or blue colors according to the control signal.

The rear substrate may include switching elements. The rear substrate may switch pixel electrodes. For example, the pixel electrode may change the molecular arrangement of the liquid crystal layer according to a control signal applied from the outside. The liquid crystal layer may include a plurality of liquid crystal molecules. The arrangement of the liquid crystal molecules may change according to a voltage difference generated between the pixel electrode and the common electrode. The liquid crystal layer may transmit light provided from the backlight unit 120 to the front substrate.

The backlight unit 120 may be located on the rear side of the display panel 11 . The backlight unit 120 may include a plurality of light sources. The light source of the backlight unit 120 may be disposed in a direct type or an edge type. In the case of the edge type backlight unit 120, a light guide panel may be further included.

The backlight unit 120 may be coupled to the front side of the frame 140 . For example, it means that a plurality of light sources may be disposed on the front side of the frame 140, and in this case, it may be collectively referred to as a direct type backlight unit.

The backlight unit 120 may be driven by a full driving method or a partial driving method such as local dimming or impulsive. The backlight unit 120 may include an optical sheet 125 and an optical layer 123 .

The optical sheet 125 may evenly transmit light from a light source to the display panel 110 . The optical sheet 125 may be composed of a plurality of layers. For example, it may include at least one prism sheet and/or at least one diffusion sheet.

At least one coupling part 125d may be present in the optical sheet 125 . The coupling part 125d may be coupled to the front cover 105 and/or the back cover 150 . That is, it means that it can be directly coupled to the front cover 105 and/or the back cover 150. Alternatively, the coupling portion 125d may be coupled to a structure coupled to the front cover 105 and/or the back cover 150 . That is, it means that it can be indirectly coupled to the front cover 105 and/or the back cover 150.

The optical layer 123 may include a light source or the like. A detailed configuration of the optical layer 123 will be described in a corresponding section.

The frame 130 may serve to support components of the display device 100 . For example, components such as the backlight unit 120 may be coupled to the frame 130 . The frame 130 may be made of a metal material such as aluminum alloy.

The back cover 150 may be located on the rear side of the display device 100 . The back cover 150 may protect internal components from the outside. At least a portion of the back cover 150 may be coupled to the frame 130 and/or the front cover 105 . The back cover 150 may be an injection-molded product made of a resin material.

4 is a diagram showing the configuration of the optical sheet 125 and the like.

As shown in (a) of FIG. 4 , an optical sheet 125 and/or a diffusion plate 129 may be positioned above the frame 130 . The optical sheet 125 and/or the diffusion plate 129 may be coupled to the frame 130 at an edge of the frame 130 . The optical sheet 125 and/or the diffusion plate 129 may be directly seated on the edge of the frame 130 . That is, the outer circumference of the optical sheet 125 and/or the diffusion plate 129 may be supported by the frame 130 . An upper surface of the edge of the optical sheet 125 and/or the diffusion plate 129 may be covered by the first guide panel 117 . For example, the optical sheet 125 and/or the diffusion plate 129 may be positioned between the edge of the frame 130 and the flange 117a of the first guide panel 117 .

The display panel 110 may be located on the front side of the optical sheet 125 . An edge of the display panel 110 may be coupled to the first guide panel 117 . That is, the display panel 110 may be supported by the first guide panel 117 .

An edge area of the front surface of the display panel 110 may be covered by the front cover 105 . For example, this means that the display panel 110 can be positioned between the first guide panel 117 and the front cover 105 .

As shown in (b) of FIG. 4 , the display device 100 according to an embodiment of the present invention may further include a second guide panel 113 . The optical sheet 125 and/or the diffusion plate 129 may be coupled to the second guide panel 113 . That is, the second guide panel 113 may be coupled to the frame 130 , and the optical sheet 125 and/or the diffusion plate 129 may be coupled to the second guide panel 113 . The second guide panel 113 may be made of a material different from that of the frame 130 . The frame 130 may have a shape surrounding the first and second guide panels 117 and 113 .

As shown in (c) of FIG. 4 , in the display device 100 according to an embodiment of the present invention, the front cover 105 may not cover the front surface of the display panel 110 . That is, one end of the front cover 105 may be positioned on the side of the display panel 110 .

5 and 6 , the backlight unit 120 includes an optical layer 123 including a substrate 122, at least one light assembly 124, a reflective sheet 126 and a diffusion plate 129, and , An optical sheet 125 positioned on the front side of the optical layer 123 may be included.

The substrate 122 may be configured in the form of a plurality of straps extending in a first direction and spaced apart at predetermined intervals in a second direction orthogonal to the first direction.

At least one light assembly 124 may be mounted on the substrate 122 . An electrode pattern for connecting the adapter and the light assembly 124 may be formed on the substrate 122 . For example, a carbon nanotube electrode pattern for connecting the light assembly 124 and the adapter may be formed on the substrate 122 .

The substrate 122 may be made of at least one of polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon. The substrate 122 may be a printed circuit board (PCB) on which at least one light assembly 124 is mounted.

Light assemblies 124 may be disposed on the substrate 122 at predetermined intervals in the first direction. The diameter of the light assembly 124 may be greater than the width of the substrate 122 . That is, it means that the length of the substrate 122 may be greater than the length of the second direction.

The light assembly 124 may be a light emitting diode (LED) chip or a light emitting diode package including at least one light emitting diode chip.

The light assembly 124 may be composed of a colored LED or a white LED emitting at least one color among colors such as red, blue, and green. The colored LED may include at least one of a red LED, a blue LED, and a green LED.

A light source included in the light assembly 124 may be a COB (Chip On Board) type. The COB type may be a form in which an LED chip, which is a light source, is directly coupled to the substrate 122 . Therefore, the process can be simplified. In addition, resistance can be lowered, thereby reducing energy lost as heat. That is, it means that the power efficiency of the light assembly 124 can be increased. The COB type can provide brighter lighting. The COB type can be implemented thinner and lighter than before.

A reflective sheet 126 may be positioned on the front side of the substrate 122 . The reflective sheet 126 may be positioned on an area of the substrate 122 excluding an area where the light assembly 124 is formed. That is, it means that a plurality of through holes 235 may be formed in the reflective sheet 126 .

The reflective sheet 126 may reflect light emitted from the light assembly 124 toward the front side. In addition, the reflective sheet 126 may reflect the light reflected from the diffusion plate 129 again.

The reflective sheet 126 may include at least one of metal and metal oxide, which are reflective materials. For example, the reflective sheet 126 may include a metal and/or a metal oxide having a high reflectance such as at least one of aluminum (Al), silver (Ag), gold (Au), and titanium dioxide (TiO ₂ ). can include

The reflective sheet 126 may be formed by depositing and/or coating a metal or metal oxide on the substrate 122 . Ink containing a metal material may be printed on the reflective sheet 126 . The reflective sheet 126 may have a deposition layer formed using a vacuum deposition method such as a thermal evaporation method, an evaporation method, or a sputtering method. A coating layer and/or a printing layer using a printing method, a gravure coating method, or a silk screen method may be formed on the reflective sheet 126 .

An air gap may be positioned between the reflective sheet 126 and the diffusion plate 129 . The air gap may serve as a buffer in which light emitted from the light assembly 124 can spread widely. In order to maintain an air gap, a supporter 200 may be positioned between the reflective sheet 126 and the diffusion plate 129 .

A resin may be deposited on the light assembly 124 and/or the reflective sheet 126 . The resin may serve to diffuse light emitted from the light assembly 124 .

The diffusion plate 129 may diffuse the light emitted from the light assembly 124 upward.

The optical sheet 125 may be positioned on the front side of the diffusion plate 129 . A rear surface of the optical sheet 125 may adhere to the diffusion plate 129 , and a front surface of the optical sheet 125 may adhere to the rear surface of the display panel 110 .

The optical sheet 125 may include at least one or more sheets. Specifically, the optical sheet 125 may include one or more prism sheets and/or one or more diffusion sheets. A plurality of sheets included in the optical sheet 125 may be in an adhesive and/or closely adhered state.

The optical sheet 125 may be composed of a plurality of sheets having different functions. For example, the optical sheet 125 may include first to third optical sheets 125a to 125c. The first optical sheet 125a may have a function of a diffusion sheet, and the second and third optical sheets 125b and 125c may have a function of a prism sheet. The number and/or location of the diffusion sheet and prism sheet may be varied. For example, this means that the first optical sheet 125a, which is a diffusion sheet, and the second optical sheet 125b, which is a prism sheet, may be included.

The diffusion sheet can prevent the light emitted from the diffusion plate from being partially concentrated, thereby making the luminance of the light more uniform. The prism sheet may condense light emitted from the diffusion sheet so that the light is vertically incident to the display panel 110 .

The coupling portion 125d may be formed on at least one of the corners of the optical sheet 125 . The coupler 125d may be formed on at least one of the first to third optical sheets 125a to 125c.

The coupling portion 125d may be formed at a corner of the long side of the optical sheet 125 . The coupling portion 125d formed on the first long side and the coupling portion 125d formed on the second long side may be asymmetric. For example, this means that the positions and/or numbers of the first long-side coupling parts 125d and the second long-side coupling parts 125d may be different from each other.

Referring to (a) of FIG. 7 , a substrate 122 composed of a plurality of straps extending in a first direction on a frame 130 and spaced apart at predetermined intervals in a second direction orthogonal to the first direction is provided. can One end of the plurality of substrates 122 may be connected to the wiring electrode 232 .

The wiring electrode 232 may extend in the second direction. The wiring electrode 232 may be connected to one end of the substrate 122 at regular intervals in the second direction.

A wiring hole 234 may be formed at one end of the wiring electrode 232 . The wiring hole 234 may be a micro hole penetrating the frame 130 . Through the wiring hole 234 , the wiring electrode 232 may extend to the rear surface of the frame 130 . Through the wiring hole 234 , the wiring electrode 232 may be electrically connected to an adapter (not shown) located on the back of the frame 130 .

The light assembly 124 may be mounted on the substrate 122 at a predetermined interval in a first direction. The diameter of the light assembly 124 may be greater than the width of the substrate 122 in the second direction. Accordingly, the outer region of the light assembly 124 may pass over to the region where the substrate 122 is not provided.

Referring to (b) of FIG. 7 , the substrate 122 composed of a plurality of straps may extend from both ends in directions other than the first direction. That is, both ends of the substrate 122 may extend to the corner region so that the light assembly 124 is located in the corner region.

As the board 122 on which the light assembly 124 is mounted is located in the corner region, the dark portion of the corner region may be compensated for. That is, it means that the entire area of the display device can emit light uniformly.

One end of the substrate 122 located in the corner region may be connected to the wiring electrode 232 . The wiring electrode 232 may extend in the second direction and may be electrically connected to an adapter located on the rear surface of the frame 130 through a wiring hole 234 formed at one end.

Referring to FIG. 8 , the wiring electrode 232 extending from the front surface of the frame 130 through the wiring hole 234 may be connected to one side of the power supply 315 . The power supply 315 may be a printed circuit board that supplies power to the display device 100 . The power supply 315 may change the AC frequency to a DC frequency. That is, the power supply 315 may change a low frequency to a high frequency to increase electrical efficiency.

The power supply 315 may cause the light assembly 124 positioned on the front of the frame 130 to emit light through the wiring electrode 232 .

The power supply 315 may be connected to the main board 321 through the wiring electrode 232 on the other side. The main board 321 may be separated from the power supply 315 by a predetermined interval. For example, the main board 321 may be positioned facing the power supply 315 in the second direction based on the center of the frame 130 .

The main board 321 may be a printed circuit board providing an interface for the display device 100 to operate. In addition, the main board 321 may check and manage operating states of each component of the display device 100 .

The main board 321 and the power supply 315 may be connected to the T-CON board 319 through the wiring electrode 232 . The T-con board 319 may be a printed circuit board that transfers signals input from the main board 321 or the power supply 315 to the display panel 110 . The T-Con board 319 may be electrically connected to the display panel 110 on the front side of the frame 130 through a flat flex cable (FFC) 251.

Although each printed circuit board is shown as being connected to each other, it is not limited thereto, and at least some of each printed circuit board may be connected to each other.

9 and 10 are diagrams illustrating a light source according to an embodiment of the present invention.

As shown in FIG. 9 , the light source 203 may be a COB type. It may be a COB type. The COB type light source 203 may include at least one of a light emitting layer 135 , first and second electrodes 147 and 149 , and a fluorescent layer 137 .

The light emitting layer 135 may be positioned on the substrate 122 . The light emitting layer 135 may emit light of any one of blue, red, and green. The light emitting layer 135 includes Firpic, (CF3ppy)2Ir (pic), 9, 10-di (2-naphthyl) anthracene (AND), Perylene, distyrybiphenyl, PVK, OXD-7, UGH-3 (Blue), and combinations thereof. may include any one of them.

The first and second electrodes 147 and 149 may be located on both sides of the lower surface of the light emitting layer 135. The first and second electrodes 147 and 149 may transfer an external driving signal to the light emitting layer 135 .

The phosphor layer 137 may cover the light emitting layer 135 and the first and second electrodes 147 and 149 . The fluorescent layer 137 may include a fluorescent material that converts light of a spectrum generated from the light emitting layer 135 into white light. Above the phosphor layer 137, the light emitting layer 135 may have a uniform thickness. The fluorescent layer 137 may have a refractive index of 1.4 to 2.0.

The COB type light source 203 according to the present invention may be directly mounted on the substrate 122 . Accordingly, the size of the light assembly 124 may be reduced.

Since the light source 203 is positioned on the substrate 122 and has excellent heat dissipation, it can be driven with a high current. Accordingly, it is possible to reduce the number of light sources 203 required to secure the same amount of light.

Since the light source 203 is mounted on the substrate 122, a wire bonding process may not be required. Accordingly, cost can be saved by simplifying the process.

As shown in FIG. 10 , the light source 203 according to an embodiment of the present invention may emit light over the first light emitting range EA1. That is, light emission can be made over an area including the second light emitting range EA2 on the front side and the third and fourth light emitting ranges EA3 and EA4 on the side surface. This is different from the conventional light source including the POB type that emits light in the second light emitting range EA2. That is, the light source 203 according to an embodiment of the present invention may be a COB type light source, and the COB type light source 203 may emit light in a wide range including the side surface.

Since the COB-type light source 203 emits light in a direction corresponding to the second light emitting range EA2, which is the lateral direction, it is necessary to effectively control the light in the lateral direction. The reflective sheet according to an embodiment of the present invention may adjust the reflectance of light emitted in the lateral direction of the light source 203 . Accordingly, non-uniformity in brightness due to light in a lateral direction can be reduced.

11 is a diagram illustrating a coupling relationship between a reflective sheet and peripheral components according to an embodiment of the present invention.

As shown therein, the reflective sheet 126 according to an embodiment of the present invention may be seated on the frame 130 . For example, this means that the reflective sheet 126 can be coupled to the mounting portion 132 formed inside the frame 130 .

A horizontal coupling portion HH and/or a vertical coupling portion VH may be formed in the reflective sheet 126 . For example, this means that coupling holes may be formed in some regions along the long side and/or the short side of the reflective sheet 126 .

The horizontal coupling portion HH and/or the vertical coupling portion VH may be inserted into the horizontal projection 130H and/or the vertical projection 130V formed on the frame 130 . A guide panel GP may be coupled to the reflective sheet 126 .

The guide panel GP may be made of an injected plastic material or a plastic machined metal material. The guide panel GP may be coupled to the horizontal projections 130H and/or the vertical projections 130V. When the guide panel GP is coupled to the reflective sheet 126, the reflective sheet 126 may be fixed between the frame 130 and the guide panel GP. In the drawing, the guide panel GP is shown in a form separated along the long side and the short side, but a form in which the long side and the short side are combined may also be possible.

The reflective sheet 126 seated on the frame 130 may have a three-dimensional shape corresponding to the shape of the seat portion 132 . Even when the reflective sheet 126 according to an embodiment of the present invention is configured in a three-dimensional shape, an optimal reflection effect can be realized. For example, this means that light can be reflected evenly throughout the reflective sheet 126 .

The reflective sheet 126 may constitute a part of the backlight unit ( 120 in FIG. 5 ). A substrate 122 on which a light source 203 is mounted may be positioned between the reflective sheet 126 and the frame 130 .

In the display device according to the present invention, one substrate 122 may be disposed extending in a first direction. Since the substrate 122 is composed of one, the number of light assemblies 124 required for the display device may be reduced, and manufacturing costs may be reduced. In addition, since the substrate 122 is composed of one, uniformity of light can be further improved than when the substrate 122 is formed in plurality. The substrate 122 may be connected to a signal line 121 connected to a control unit of the display device 100 . The signal line 121 may be connected through a through hole formed in the frame 130 .

A coupling hole 317 may be formed in a portion of the reflective sheet 126 corresponding to the substrate 122 . For example, the coupling hole 317 may be formed to extend in the first direction to correspond to the substrate 122 .

The reflective sheet 126 may include a plurality of supporter holes 205 . The supporter 200 may be coupled to the supporter hole 205 . The supporter 200 may support the diffusion plate 129 and/or the optical sheet 125 located on the front surface of the half-sight sheet 126 . That is, it means that the reflective sheet 126 and the diffusion plate 129 and/or the optical sheet 125 may be separated by a predetermined distance.

12 is a view showing the configuration of a reflective sheet according to an embodiment of the present invention.

As shown in FIG. 12 , in the display device according to the present invention, the reflective sheet 126 may include a first sheet area 126a and a second sheet area 126b. The first seat area 126a may be positioned at a portion corresponding to the seating portion ( 132 in FIG. 11 ) of the frame 130 . When the first seat area 126a is combined with the frame 130, it may change to correspond to the shape of the inside of the frame 130. That is, the first sheet area 126a may extend in a horizontal direction.

The second seat area 126b may be located at a portion corresponding to the sidewall surface of the frame 130 . Similar to the side wall surface of the frame 130, the second seat area 126b may be formed parallel to the Z direction or inclined at an angle in the Z direction.

In the display device according to the present invention, since the substrate 122 is composed of one, the mounting portion inside the frame 130 where the substrate 122 is located may not have a wide width. Accordingly, the width BA of the first sheet area 126a in the second direction corresponding to the mounting portion ( 132 in FIG. 11 ) of the frame 130 is the width CA of the second sheet area 126b in the second direction. ) can be smaller than

13 is a view showing a light assembly positioned on a substrate according to an embodiment of the present invention.

As shown in FIG. 13 , a light assembly 124 may be disposed on a substrate 122 . The light assembly 124 includes a light source 203 and a lens 300 , and the lens 300 may be mounted in a substrate groove SD formed in the substrate 122 .

As shown in (a) of FIG. 13 , the existing optical assembly 124 may have the same or similar diameter in all parts of the lens 300 . That is, the existing lens 300 may have the same or similar diameter SR1 in the first direction and diameter SR2 in the second direction.

A diameter of the lens 300 may be greater than a width of the substrate 122 in the second direction. Accordingly, the lens 300 may protrude a first length PD1 from the substrate 122 in the second direction.

In the case of the display device according to the existing invention, since the diameter of the lens 300 is the same or similar in all parts, the first length PD1 may be short.

As shown in (b) of FIG. 13 , in the display device according to the present invention, the diameter of the lens 300 may vary depending on the position. For example, the first direction diameter SR2 of the lens 300 may be shorter than the second direction diameter LR2. That is, in the display device according to the present invention, the lens 300 may have an elliptical shape.

In the display device according to the present invention, the lens 300 may protrude from the substrate 122 by the second length PD2 . The lens 300 may have a larger diameter in the second direction. Accordingly, the lens 300 may protrude more from the substrate 122 in the second direction. Accordingly, the second length PD2 may be longer than the first length PD1.

14 to 22 are diagrams showing the configuration of a reflective sheet according to an embodiment of the present invention.

As shown in FIG. 14 , in the display device according to the present invention, the light assembly 124 may have an elliptical shape. For example, the diameter of the light assembly 124 in the second direction may be greater than the diameter in the first direction. Accordingly, the light assembly 124 may have a larger range in which light is emitted in the second direction compared to conventional light assemblies.

Accordingly, even if there is only one substrate 122 on which the light assembly 124 is mounted, emitted light may more strongly reach the edge of the display device in the second direction. Accordingly, light uniformity of the display device may be maintained even when the substrate 122 is formed of one.

As shown in FIG. 15 , in the display device according to the present invention, the reflective sheet 126 may include a cutout 159 . The cutout 159 may be a cutout portion of the reflective sheet 126 . The cutout 159 may be located at both ends on one side of the substrate 122 in the second direction. The reflective sheet 126 may be separated or brought into contact with each other using the cutout 159 .

The cutout 159 may be located on the first sheet area 126a of the reflective sheet 126 . The cutout 159 may help the first sheet area 126a to be fitted to the substrate 126 . When the cutout 159 passes into the second sheet area 126b, the shape of the boundary portion between the first sheet area 126a and the second sheet area 126b may be deformed. Accordingly, the cutout 159 may be located only on the first sheet region 126a.

As shown in FIG. 16 , the cutout 159 may extend in a direction inclined at an angle (IA) with respect to the first direction. Accordingly, the distance between the cutouts 159 may decrease as the distance between the cutouts 159 increases from the substrate 122 in the second direction. In this case, the cutout 159 may be formed inside the first sheet region 126a as the distance from the substrate 122 increases. Accordingly, the risk that the shape of the boundary portion between the first sheet region 126a and the second seat region 126b is deformed by the cutout 159 may be reduced.

One end of the cutout 159 may be located at an edge in a first direction relative to the outermost light assembly 124 . In detail, the extension line IL of the portion where the cutout 159 and the substrate 122 come into contact may be located outside the extension line OLL of the light assembly 124 located at the outermost periphery.

If the contact portion between the cutout 159 and the substrate 122 is inside the outermost light assembly 124, the light assembly 124 located outside the cutout 159 does not have the reflective sheet 126 inserted therein. may not be Accordingly, a portion where the cutout 159 and the substrate 122 come into contact may be located at an edge rather than the outermost light assembly 124 .

As shown in (a) of FIG. 17 , the cutout 159 may extend at a right angle in the first direction. That is, the distance between the cutouts 159 may be constant even when the cutouts 159 are away from the substrate 122 .

In this case, since the width between the cutouts 159 is constant, durability of the reflective sheet can be further improved.

As shown in (b) of FIG. 17 , the extension line IL extending from the cutout 159 in the second direction may be located outside the one end of the extension line SL of the substrate 122 . That is, the width of the reflective sheet 126 separated by the cutout 159 in the first direction may be greater than the width of the substrate 122 in the first direction.

In this case, since the width of the reflective sheet 126 is large, it may be more convenient to insert the reflective sheet 126 into the substrate 122 .

As shown in (c) of FIG. 17 , the cutout 159 may be inclined by 90 degrees or more with respect to the first direction. That is, the distance between the cutouts 159 may increase as the distance between the cutouts 159 increases in the second direction from the substrate 122 .

In this case, since the distance between the cutouts 159 increases as the cutouts 159 move away from the substrate 122, it may be more convenient to insert the reflective sheet 126 into the substrate 122.

The shape of the cutout 159 is not limited to those shown in the drawings, and other shapes are also applied if the line extending from the cutout 159 in the second direction is located outside the extension line of the outermost light assembly 124. It could be possible.

As shown in FIG. 18 , in order to insert the reflective sheet 126 into the lower end of the light assembly 124, first, the reflective sheet 126 located on the opposite side of the cutout may be inserted into the reflective sheet 126. In this case, the reflective sheet 126 at the portion where the cutout is located may be separated from the reflective sheet 126 at another portion.

After that, the upper surface RSF of the reflective sheet 126 where the cutout is located may be inserted to contact the lower surface LBS of the light assembly 124 . First, the upper surface RSF of the end of the reflective sheet 126 may be bent to enter under the lower surface LBS of the light assembly 124 . One end of the bent reflective sheet 126 may be pushed in so that the lower surface LBS of the light assembly 124 and the upper surface RSF of the reflective sheet 126 may come into contact with each other.

Since the lower surface LBS of the light assembly 124 presses the upper surface RSF of the reflective sheet 126, the reflective sheet 126 may not be easily separated after being inserted.

As shown in (a) of FIG. 19 , the conventional display device may include a lens hole 235 at a portion where the reflective sheet 126 corresponds to the light assembly 124 . In this case, after the light assembly 124 corresponds to the lens hole 235, the reflection sheet 126 may be covered and combined.

In this case, since the diameter of the light assembly 124 is greater than the width of the substrate 122, at least a portion of the light assembly 124 may protrude from the substrate 122. In this case, the protruding portion may not be covered by the reflective sheet 126 by the lens hole 235 . That is, the protruding portion means that the frame 130 may be exposed upward. Accordingly, the dark portion may be formed by the exposed frame 130 . In this case, light emitted from the backlight unit may not be uniform.

Unlike this, as shown in (b) of FIG. 19 , in the display device according to the present invention, the reflective sheet 126 may be inserted under the light assembly 124 . Accordingly, the frame 130 may not be exposed to the outside. In this case, since light is reflected by the reflective sheet 126 or the substrate 122 in all areas, the dark portion may not be formed. That is, light emitted from the backlight unit may be uniform.

Referring to FIG. 20 , since the light source is located at the center of the light assembly 124, a bright spot may be formed at a portion where the light assembly 124 is located. Accordingly, it is necessary to reduce the amount of light reflected from the portion where the light assembly 124 is located.

Accordingly, a compensation hole 271 may be formed on the lower surface of the light assembly 124 protruding from the substrate 122 . The portion where the compensation hole 271 is formed may expose the frame 130 to the outside. Accordingly, the amount of reflected light may be reduced.

As shown in (a) of FIG. 20, it may be positioned in a rectangular shape at a portion where the reflective sheet 126 and the substrate 122 come into contact, and as shown in (b) and (c) of FIG. 20, The compensation hole 271 is located at a portion where the reflective sheet 126 and the substrate 122 come into contact, and the width of the compensation hole 271 in the second direction may increase toward the center of the light assembly 124 in the first direction. there is.

In the display device according to the present invention, the compensation hole 271 is formed on the lower surface of the light assembly 124 to adjust the uniformity of light emitted from the backlight unit. Accordingly, bright spots or dark spots may not be formed on the display screen.

As shown in (a) of FIG. 21 , horizontal bending lines HBL and vertical bending lines VBL may be positioned on the reflective sheet 126 . The horizontal bending line HBL and the vertical bending line VBL may be a boundary between the first sheet area 126a and the second sheet area 126b. When the reflective sheet 126 is coupled to the frame 130, the first sheet area 126a and the second sheet area 126b may be separated by folding the horizontal bending line HBL and the vertical bending line VBL. . For example, the first sheet area 126a may be located inside the horizontal bending line HBL and the vertical bending line VBL, and the second sheet area 126b may be located outside the horizontal bending line HBL and the vertical bending line VBL.

The horizontal bending line HBL may include a dashed area DL and a central area JL. The dashed area DL may be an area in which a hole is formed in the horizontal bending line HBL. As the size of the dashed area DL increases, the horizontal bending line HBL can be more easily folded. The central region JL may be a region in which no hole is formed in the horizontal bending line HBL. As the size of the central region JL increases, shapes of both sides of the horizontal bending line HBL may be maintained even when the horizontal bending line HBL is folded.

The dash area DL and the center area JL may be alternately positioned. In the horizontal banding line HBL, the dash area DL and the center area JL may occupy a 1:1 ratio. That is, each dash area DL may have a constant width, and each center area JL may also have a constant width.

Although only the horizontal bending line HBL is shown in this figure, the vertical bending line HBL may also have the same configuration.

As shown in (b) of FIG. 21 , the reflective sheet 126 may include first to third sheet areas 126a to 126c.

The first sheet area 126a and the second sheet area 126b may be divided by a horizontal bending line HBL or a vertical bending line VBL. That is, the first sheet area 126a and the second sheet area 126b may be folded using a horizontal bending line HBL or a vertical bending line VBL. Accordingly, the first sheet area 126a and the second sheet area 126b may extend in different directions.

In this case, the second seat area 126b may be naturally changed to fit the shape of the frame 130 . That is, it means that the naturally rounded second sheet area 126b can be formed. Accordingly, a separate additional process for forming a chamfer of the reflective sheet 126 may not be required, and thus workability may be improved.

The smaller the ratio of the dashed regions DL, the greater the tensile stress between the first sheet region 126a and the second sheet region 126b. In this case, one end of the first seat area 126a may be spaced apart from the bottom surface of the frame 130 by a first distance HD1 by the second sheet area 126b. That is, it means that the first seat region 126a can be lifted from the bottom surface of the frame 130 by the tensile force of the second seat region 126b.

Unlike this, as shown in (a) of FIG. 22 , the ratio of the dash area DL and the center area JL of the horizontal banding line HBL may be different. The width of the dashed region DL per unit area may be greater than the width of the central region JL. For example, the dashed area DL may be positioned in the shape of a chain dotted line. That is, it means that the long-width dash area DL and the small-width dash area DL can be alternately positioned.

As shown in (b) of FIG. 22, since the width of the dashed area DL per unit area is greater than the width of the central area JL, one end of the first sheet area 126a is the second sheet area 126b. As a result, the frame 130 may be spaced apart from the bottom surface by the second distance HD2. The second interval HD2 may be smaller than the first interval (HD1 in FIG. 21 ). That is, the degree to which the first seat region 126a is lifted from the bottom surface of the frame 130 may be less. Since the first sheet area 126a of the reflective sheet 126 is less lifted, the backlight unit can emit light more uniformly.

23 and 24 are diagrams illustrating a positional relationship between a reflective sheet and peripheral components according to an embodiment of the present invention.

As shown in (a) of FIG. 23 , the conventional display device may have a structure in which a substrate 122 is covered with a reflective sheet 126 . Accordingly, the height of the portion adjacent to the light assembly 124 may be different. That is, at least a portion of the light emitted to the side of the light assembly 124 may be reflected by the side of the reflective sheet 126 .

Accordingly, as shown in the drawing, a bright spot may be formed at a portion where the light assembly 124 is located by light reflected from the side of the anti-sight sheet 126 .

Alternatively, as shown in (b) of FIG. 23 , the display device according to the present invention may have a structure in which the reflective sheet 126 is inserted into the side surface of the substrate 122 . Accordingly, the height of the bottom surface may be constant at any part.

In this case, as shown in the drawing, the light emitted to the side of the light assembly 124 can spread without being obstructed. Accordingly, the backlight unit may emit light more uniformly.

As shown in (a) of FIG. 24 , the display device according to the related art may have a structure in which a substrate 122 is covered with a reflective sheet 126 . Accordingly, the reflective sheet 126 may be lifted from the frame 130 in a portion where the substrate 122 is not located. In this case, the reflective sheet 126 may descend toward the frame 130 as it is further away from the substrate 122 . That is, the height of the reflective sheet 126 may decrease as the distance from the substrate 122 increases. Accordingly, the reflective sheet 126 may not uniformly reflect light, and thus light from the backlight unit may not be uniformly emitted.

Alternatively, as shown in (b) of FIG. 24 , the display device according to the present invention may have a structure in which the reflective sheet 126 is inserted into the side surface of the substrate 122 . Accordingly, the reflective sheet 126 may contact the frame 130 . That is, the reflective sheet 126 may have the same height regardless of its position. Accordingly, the reflective sheet 126 uniformly reflects light so that light from the backlight unit can be uniformly emitted.

25 is a view showing the configuration of a reflective sheet according to another embodiment of the present invention.

As shown in FIG. 25 , in the display device according to the present invention, the cutout 159 may be positioned on both sides of the substrate 122 in the second direction. The cutout 159 may include a first cutout 159a located on the upper side of the substrate in the second direction and a second cutout 159b located on the lower side of the substrate in the second direction. The first cutout 159a and the second cutout 159b have symmetrical shapes with respect to the substrate 122, but are not limited thereto, and may have different shapes.

In the display device according to the present invention, the cutout 159 may be located on both sides of the substrate 122 in the second direction. Accordingly, the first and second cutouts 159a and 159b may be opened and the reflective sheet 126 may be inserted into the side surface of the substrate 122 . Accordingly, the reflective sheet 126 can be more easily assembled.

26 to 32 are diagrams showing dot distribution or strip distribution of a reflective sheet according to an embodiment of the present invention.

As shown in FIG. 26 , the frame 130 may include first to third frame areas 130a to 130c.

The first frame area 130a may be a bottom surface of the frame 130 . The second frame region 130a may be substantially flat. That is, it may be a surface located on the X-Y plane of the display device 100.

The second frame region 130b may be a side wall surface extending upward from the first frame region 130a. The second frame area 130b may be in a direction parallel to the Z direction or inclined at an angle to the Z direction. A seating portion ( 132 in FIG. 10 ) may be formed inside the frame 130 by the second frame region 130b serving as a side wall of the frame 130 .

The third frame area 130c may be a surface extending in the X direction from the second frame area 130b. The third frame area 130c may be substantially parallel to the first frame area 130a. That is, although the height of the second frame region 130b is different from that of the first frame region 130a, it may be a flat surface like the first frame region 130a.

A protruding area may exist in the third frame area 130c. A protrusion formed by a separate process may be coupled to the third frame region 130c. The reflective sheet 126 may be coupled to the protrusion area and/or the protrusion of the third frame 130c. For example, this means that the third sheet area 130c of the reflective sheet 126 may be combined. An optical sheet ( 125 in FIG. 5 ) may be coupled to the protrusion area and/or the protrusion of the third frame 130c.

The reflective sheet 126 may be coupled to regions formed by the first, second, and third frame regions 130a to 130c. When the reflective sheet 126 and the frame 130 are coupled, the shape of the reflective sheet 126 may naturally change to correspond to the shape of the frame 130 . That is, it means that the naturally rounded second sheet area 126b can be formed. Accordingly, a separate additional process for forming a chamfer of the reflective sheet 126 may not be required, and workability may be improved.

The reflective sheet 126 may include first to third sheet areas 126a to 126c. That is, it means that the area of the reflective sheet 126 can be divided according to whether the reflective sheet 126 and the frame 130 are in contact or not. For example, the reflective sheet 126 may be divided into a contact area that contacts the frame 130 and a non-contact area that does not contact the frame 130 .

The first and second sheet regions 126a and 126b may be divided by a horizontal bending line HBL. In other words, the second sheet area 126b may be an area between the horizontal bending line HBL and contacting the area of the third frame 130c. In other words, the first and second sheet regions 126a and 126b may be classified according to whether or not they are in contact with the first region 130a of the frame 130 .

The second sheet area 126b may be naturally spaced apart from the frame 130 due to physical properties or elasticity of the reflective sheet 126 itself. This means that when the seat area 126b is coupled to the frame 130, the second sheet area 126b naturally forms a curved surface by its own weight and can be separated from the frame 130. A separation space 130d may be formed between the second seat area 126b and the frame 130 . In the second sheet area 126b, an angle between the reflective sheet 126 and the bottom surface of the frame 130 may gradually increase. That is, it means that the reflective sheet 126 may be positioned in the form of a two-dimensional curve in the non-contact area. It may also be possible that the second seat area 126b is spaced apart from the frame 130 at a predetermined angle.

The third sheet area 126c may be seated on the third frame area 130c. The third sheet area 126c may be coupled to the third frame area 130c. Alternatively, the third sheet area 126c may be naturally raised on the third frame area 130c. That is, due to elastic force in the Z direction due to the curved second sheet area 126c, the third sheet area 126c may come into contact with the third frame area 130c.

Light L may be emitted through the lens 300 . That is, light generated from the light source may be emitted to the outside through the lens 300 . Light (L) emitted through the lens 300, can form a variety of paths. For example, some of the light L may form a lateral path of the lens 300 .

Some of the light L of the lateral path may be directed toward the second sheet area 126b. At least some of the light generated from the light source is totally reflected inside the lens 300 and may be directed toward the second sheet area 126b. In this case, among the second sheet area 126b, the amount of light L directed to the upper area may be greater than the amount of light L directed to the lower area. In other words, the amount and/or density of the light L transmitted to the reflective sheet 126 may not be uniform. When the amount and/or density of light L is non-uniform, a user viewing the display apparatus 100 may perceive the difference. For example, when more light L is incident on the upper region than the lower region of the second sheet region 126b, the corresponding region may appear brighter than other regions due to the light L reflected from the upper region. means

As shown in FIG. 27, the extension line from the boundary between the first sheet region 126a and the second sheet region 126b to the boundary between the second sheet region 126b and the third sheet region 126c and the X direction Let A be the angle between two parallel lines. The second sheet region 126b may have a large inclination angle starting from P, which is the intersection point of the angle A with the straight line. That is, it means that the angle with the X direction rapidly increases while passing through the intersection point P.

As the angle of the second sheet region 126b increases while passing through the intersection point P, the density per unit area of the light L emitted from the lens (124b in FIG. 11) may increase. Therefore, the corresponding part may appear to be stepped on more than other parts. Therefore, the user may feel that the light is non-uniform. The display device 100 according to an embodiment of the present invention may uniformly reflect light from the reflective sheet 126 . Therefore, the user may not feel or feel less non-uniformity of light.

As shown in FIG. 28 , a dot area DT may be located in at least a partial area of the reflective sheet 126 according to an embodiment of the present invention.

A dot may be an area to which a pattern different from other areas is added. The dots may be concave-convex portions formed on the reflective sheet 126 . A dot may be an area in which at least a portion of the reflective sheet 126 is colored. For example, it may be a relatively dark color area. For example, it may be a black or gray area. A dot may be a region in which irregularities and coloring are mixed. A dot may have a geometric shape different in at least one of a shape, size, location, and color. For example, the dot may be formed on the reflective sheet 126 in one of various shapes such as a circle, an ellipse, a rectangle, a rod shape, and a triangle, and/or a combination of various shapes.

Dots can affect the reflectivity of that area. That is, the dot means that the reflectance of light can be changed. For example, a dot may reduce light reflectivity according to at least one of a size, shape, position, and color. The dots may be configured in the form of a dot area DT in which a plurality of dots are gathered.

The dot area DT may be a set of dots. That is, it may be a specific area formed with a plurality of dots having the same or different at least one of shape, size, position, and color. For example, a dot area DT may be formed in at least a partial area of the second sheet area 126b. As described above, the light density per unit area of the second sheet region 126b may be high due to the inclined arrangement. The dot area DT may change reflectance of light incident on the second sheet area 126b. In other words, the density of incident light per unit area is high, but the density of reflected light can be reduced. Therefore, it is possible to prevent a phenomenon in which the contrast of the portion corresponding to the second sheet region 126b is different from that of other portions. That is, due to the presence of the dot region DT, light may be uniformly reflected throughout the reflective sheet 126 .

The dot area DT may include a first dot area DT1 and a second dot area DT2. The first dot area DT1 may be a dot area DT positioned on the long side of the reflective sheet 126 . In other words, it may be a dot area DT positioned between the light assembly 124 and the long side of the reflective sheet 126 . The first dot area DT1 may be located on the second sheet area 126b. That is, it means that the light assembly 124 may be located inside the horizontal bending line HBL and the first dot area DT1 may be located outside.

The first dot area DT1 may be positioned at a portion corresponding to the lens. That is, at least one first dot area DT1 may be spaced apart from another adjacent first dot area DT1 by a predetermined distance. The first dot area DT1 may have a semicircular shape. Accordingly, the width of the first dot region DT1 in the first direction may decrease toward the corner of the reflective sheet 126 .

The second dot area DT2 may be a dot area DT located on a short side of the reflective sheet 126 . The second dot area DT2 may be located in the second sheet area 126b. That is, the light assembly 124 may be located inside the vertical bending line VBL and the second dot area DT2 may be located outside.

That is, the dots of the first and second dot areas DT1 and DT2 may gradually change at least one attribute among size, density, and color. For example, the dots of the first and second dot regions DT1 and DT2 may gradually increase in size as they move toward the corner of the reflective sheet 126 . Accordingly, light reflected from the reflective sheet 126 may be uniform.

As shown in FIG. 29 , a strip area ST may be located in at least a partial area of the reflective sheet 126 according to an embodiment of the present invention.

The strip area ST may have a shape of a line. The strip area ST may be formed to have a certain width or height. The strip region ST may be continuously formed. The strip area ST may be a set of continuous lines. At least one of the sets of lines constituting the strip region ST may have a different property from the others. For example, at least one of line thickness, line length, line color, and line spacing may be different.

The strip area ST may include a first strip area ST1 and a second strip area ST2. The first and second strip regions ST1 and ST2 may be positioned at the same portions as the first and second dot regions (DT1 and DT2 in FIG. 28 ). For example, the first strip region ST1 is located between the light assembly 124 and the long side of the reflective sheet 126, and the second strip region ST2 is between the light assembly 124 and the reflective sheet 126. It may be located between short sides.

The first strip region ST1 may be positioned at a portion corresponding to the light assembly 124 . The first strip region ST1 may have a semicircular shape. Accordingly, the width of the first strip region ST1 in the first direction may decrease toward the corner of the reflective sheet 126 .

In the reflective sheet 126 according to the present invention, the strip area ST may be positioned instead of the dot area DT. Accordingly, the reflectance of the second sheet region 126b may be further reduced to make the overall luminance of the backlight unit uniform.

As shown in FIG. 30 , the strip area ST and the dot area DT may be located together on the reflective sheet 126 .

The strip area ST may be positioned adjacent to a corner of the reflective sheet 126 . That is, the strip area ST may be disposed farther from the light assembly 124 than the dot area DT. The dot area DT may be positioned between the light assembly 124 and the strip area ST.

The reflectance of light incident from the light source may be different between the dot area DT and the strip area ST. For example, reflectance in the dot area DT may be greater than reflectance in the strip area ST. In other words, it means that the reflectance in the strip area ST may be small. As described above, due to the shape of the reflective sheet 126, an area close to a corner of the reflective sheet 126 may be located close to a right angle to the first sheet area 126a. Accordingly, more light may be incident to the corresponding region than other regions. The strip region ST formed in the corresponding region may reduce the reflectance of the corresponding region to make the overall luminance uniform.

As shown in FIG. 31 , the dot area DT may be located in the entire area of the second sheet area 126b. That is, it means that dots can be distributed over the entire area of the second sheet area 126b.

As described above, at least one of a size, shape, location, and color of a dot may be changed according to the amount and/or density of light reaching the dot. For example, it means that the size of the dot may gradually increase toward the edge of the second sheet region 126b. However, it is not limited thereto, and the dots may be variously changed.

In this case, the dot area DT may be located in a part other than the part corresponding to the light assembly 124 . Accordingly, the amount and/or density of light incident to a portion other than the portion corresponding to the light assembly 124 may also be adjusted. Accordingly, light reflected from the reflective sheet 126 may be more uniform.

As shown in FIG. 32 , the second dot area DT2 may be spaced apart from the horizontal bending line HBL. In the second dot region DT2 , a portion corresponding to the light assembly 124 may protrude more toward the light assembly 124 than other portions. The part corresponding to the light assembly of the second dot area DT2 is spaced apart from the horizontal bending line HBL by the first dot spacing HD1, and the other part is spaced apart by the second dot spacing HD2 from the horizontal bending line HBL. It can be. The first dot interval HD1 may be shorter than the second dot interval HD2.

The protruding portion corresponding to the light assembly 124 of the second dot area DT2 may have at least one attribute of corgi, density, and color different from other portions. For example, a protruding portion corresponding to the light assembly 124 of the second dot area DT2 may have a larger dot size than other portions. Accordingly, light reflected from the reflective sheet 126 may be uniform.

Each embodiment and/or configuration of the present invention may be combined with each other. For example, configuration A described in a specific embodiment and/or drawing may be combined with configuration B described in another embodiment and/or drawing. That is, even if the combination between the components is not directly explained, it means that the combination is possible except for the case where the combination is impossible. This point is obvious considering that the present invention relates to a display device.

The above detailed description should not be construed as limiting in all respects and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (9)

A frame including a bottom area and a sidewall area extending from the bottom area;
a substrate positioned on at least one part of the frame and having a plurality of light assemblies mounted thereon;
a reflective sheet positioned on at least another part of the frame; and
Including an optical sheet positioned on the reflective sheet,
The reflective sheet,
Both ends of a portion in contact with one side of the substrate include cutouts,
The light assembly,
It protrudes from the substrate in a direction of a short side of the reflective sheet,
The reflective sheet,
The backlight unit further comprises a compensation hole formed in at least a portion of a portion corresponding to the protruding portion.
According to claim 1,
One end of the incision,
A backlight unit positioned outside the outermost light assembly in a long side direction of the reflective sheet.
According to claim 1,
the incision,
A backlight unit formed inclined at a predetermined angle with respect to a long side direction of the reflective sheet.
According to claim 1,
The reflective sheet,
a first seat area corresponding to the bottom surface of the frame;
a second seat region corresponding to the side wall surface of the frame;
The backlight unit further includes a horizontal bending line and a vertical bending line forming a boundary between the first and second sheet areas.
According to claim 4,
The horizontal bending line and the vertical bending line,
A dash area in which a hole is formed;
Including a central region in which no hole is formed,
The backlight unit of claim 1 , wherein a width of the dashed region per unit area is greater than a width of the central region.
delete According to claim 1,
The reflective sheet,
a first seat area corresponding to the bottom surface of the frame;
A second seat area corresponding to the sidewall surface of the frame,
A backlight unit having a dot area formed on at least a portion of the second sheet area.
According to claim 1,
The reflective sheet,
a first seat area corresponding to the bottom surface of the frame;
A second seat area corresponding to the sidewall surface of the frame,
A backlight unit having a strip area formed on at least a portion of the second sheet area.
A frame including a bottom area and a sidewall area extending from the bottom area;
a substrate positioned on at least one part of the frame and having a plurality of light assemblies mounted thereon;
a reflective sheet positioned on at least another part of the frame;
an optical sheet positioned on the reflective sheet; and
Including a display panel located on the optical sheet,
The reflective sheet,
Both ends of a portion in contact with one side of the substrate include cutouts,
The light assembly,
It protrudes from the substrate in a direction of a short side of the reflective sheet,
The reflective sheet,
and a compensation hole formed in at least a portion of a portion corresponding to the protruding portion and exposing the frame.

Images