KR102539512B1 - Backlight unit and display device including the same - Google Patents

Abstract

The present embodiments disclose a backlight unit and a display device including the same. Disclosed is a backlight unit and a display device including the same, which is disposed on at least one side of a light guide plate and includes a first fixing unit for fixing a plurality of optical sheets, a second fixing unit for controlling movement of the light guide plate, and a vertical direction on the first fixing unit. The structure of the backlight unit can be simplified by including a holder having a fastening part extended to the cover bottom and a connecting part connecting the second fixing part and the fastening part.

Description

Backlight unit and display device including the same {Backlight unit and display device including the same}

The present embodiments relate to a backlight unit and a display device including the same.

Flat display devices such as liquid crystal display devices and organic light emitting display devices are widely used due to their advantages such as low power drive, thin structure, and excellent image quality. .

Among these flat panel display devices, a liquid crystal display device includes a liquid crystal panel for controlling transmittance, a backlight unit for supplying light from the back or side of the liquid crystal panel, and a case for accommodating them. The case includes a cover bottom serving as a lower cover of the backlight unit, and a light source, a light guide plate, a reflective sheet, and an optical sheet constituting the backlight unit are accommodated in the cover bottom. And, it is combined with the liquid crystal panel by the front case forming a pair with the cover bottom to constitute a liquid crystal module.

Meanwhile, the configuration of the backlight unit includes a guide panel supporting the display panel. Such a guide panel has a problem of complicating the structure of the backlight unit and increasing its weight and thickness. Accordingly, there is a need for a backlight unit capable of simplifying the structure of the backlight unit and reducing its weight and thickness.

The present embodiments are to solve the above problems, and include a backlight unit capable of simplifying the configuration of a display device by including a cover bottom supporting a display panel, a light guide plate, and a holder fixing a plurality of optical sheets, and including the same It is intended to provide a display device that

A backlight unit and a display device including the same according to an embodiment include a light guide plate. In addition, a backlight unit and a display device including the same according to an exemplary embodiment include a plurality of optical sheets disposed on a light guide plate. In addition, a backlight unit and a display device including the same according to an exemplary embodiment include a holder provided on at least one side of the light guide plate. Further, a backlight unit and a display device including the backlight unit according to an exemplary embodiment include a cover bottom disposed on a rear surface of a light guide plate and a holder and covering a part of an upper surface of the holder and a side surface of the holder. Further, the holder of the backlight unit and the display device including the same according to an embodiment includes a first fixing part for fixing a plurality of optical sheets, a second fixing part for controlling the movement of the light guide plate, and a vertical direction on the first fixing part. A fastening part that is extended and fastened to the cover bottom and a connection part that connects the second fixing part and the fastening part may be provided.

Also, a backlight unit and a display device including the same according to another embodiment include a display panel. Also, a backlight unit and a display device including the same according to another embodiment include a light guide plate disposed on a rear surface of a display panel. Also, a backlight unit and a display device including the same according to another embodiment include a plurality of optical sheets disposed between a light guide plate and a display panel. Also, a backlight unit and a display device including the same according to another embodiment include a holder provided on at least one side of the light guide plate. Further, a backlight unit and a display device including the same according to another embodiment include a cover bottom that supports a display panel, is disposed on a rear surface of a light guide plate and a holder, and covers a part of an upper surface of the holder and a side surface of the holder. Further, a backlight unit and a display device including the same according to another embodiment include a top cover covering an upper edge of a display panel and a side surface of a cover bottom. Further, a backlight unit according to another embodiment and a holder of a display device including the same include a first fixing part for fixing a plurality of optical sheets, a second fixing part for controlling movement of a light guide plate, and a vertical direction on the first fixing part. A fastening part that is extended and fastened to the cover bottom and a connection part that connects the second fixing part and the fastening part may be provided.

A backlight unit and a display device including the same according to the present embodiments include a cover bottom supporting a display panel and a holder positioned inside the cover bottom to fix a light guide plate and a plurality of optical sheets, thereby improving the structure of the backlight unit. It has the effect of simplifying and reducing weight and thickness.

1 is an exploded perspective view schematically showing the structure of a display device according to a first embodiment.
FIG. 2 is a cross-sectional view of the display device of FIG. 1 taken along AB.
3 is a perspective view of the holder according to the first embodiment.
4 is a cross-sectional view of the backlight unit according to the first embodiment.
5 is a perspective view illustrating a fastened form of a cover bottom, a holder, and an optical sheet according to the first embodiment.
6 is a cross-sectional view of a backlight unit of a display device according to a second embodiment.
7 is a cross-sectional view of a backlight unit of a display device according to a third embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments introduced below are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention may be embodied in other shapes without being limited to the embodiments described below. And in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers indicate like elements throughout the specification.

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 shapes, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of explanation.

When an element or layer is referred to as “on” or “on” another element or layer, it includes both cases where another element or layer is intervening as well as directly on another element or layer. do. On the other hand, when an element is referred to as “directly on” or “directly on”, it indicates that no other element or layer is intervening.

The spatially relative terms "below, beneath", "lower", "above", "upper", etc., refer to one element or component as shown in the drawing. It can be used to easily describe the correlation between and other elements or components. Spatially relative terms should be understood as terms that include different orientations of elements in use or operation in addition to the directions shown in the figures. For example, when flipping elements shown in the figures, elements described as “below” or “beneath” other elements may be placed “above” the other elements. Thus, the exemplary term “below” may include directions both below and above.

1 is an exploded perspective view schematically showing the structure of a display device according to a first embodiment. Referring to FIG. 1 , the display device according to the first embodiment includes a display panel 100, driving units 150 and 160 for driving the display panel 100, and installed on the rear surface of the display panel 100, and the display panel ( A backlight unit emitting light over the entire surface of 100 and a panel guide 450 accommodating and fixing the display panel 100 and the backlight unit. At this time, at least one of the driving units 150 and 160 may be mounted in the display panel 100, but the present embodiment is not limited thereto.

Meanwhile, the display panel 100 according to the first embodiment may be a liquid crystal display panel. Although not shown in the drawings, the display panel 100 includes a color filter array substrate and a thin film transistor array substrate disposed to face each other, and , a liquid crystal layer interposed between a color filter array substrate and a thin film transistor (TFT) array substrate.

A common electrode and a pixel electrode are formed in the display panel 100 in which the color filter array substrate and the thin film transistor array substrate are bonded together to apply an electric field to the liquid crystal layer, and a data signal applied to the pixel electrode while a voltage is applied to the common electrode. When the voltage of the liquid crystal layer is controlled, the liquid crystal of the liquid crystal layer rotates by dielectric anisotropy according to the electric field between the common electrode and the pixel electrode, thereby transmitting or blocking light for each pixel to display characters or images.

In addition, a switching element such as a thin film transistor is individually provided in each pixel to control the voltage of the data signal applied to the pixel electrode for each pixel. Upper and lower polarizers (not shown) may be attached to the outside of the display panel 100 configured as described above. The lower polarizer polarizes light passing through the backlight unit, and the upper polarizer polarizes light passing through the display panel 100. polarize the light

Describing the backlight unit in detail, a light source assembly 125 including a light source array generating light is disposed on at least one side of a light guide plate 320, and a reflector 410 is disposed on the rear surface of the light guide plate 320. ) is disposed, and a plurality of optical sheets 430 disposed on the upper surface of the light guide plate 320 may be included. Here, the light source may be a light emitting diode (LED), but the present embodiment is not limited thereto.

Meanwhile, the plurality of optical sheets 430 include diffusion sheets and upper and lower prism sheets, and a protective sheet 434 may be further added.

In addition, the light source assembly 125 of the backlight unit includes a light source array and a light source printed circuit board (PCB) for driving the light source array. Although not shown in the drawings, the light source assembly 125 may be disposed to correspond to at least one surface of the light guide plate 320 . On the other hand, the light source is provided in plurality and may be arranged at equal intervals on the light source printed circuit board.

The light source assembly 125 may be mounted in a light source housing, which protects the light source assembly 125 and concentrates light emitted from a plurality of light sources toward the light guide plate 320 to prevent loss of light. In addition, the light source housing may serve to improve the heat dissipation effect of the light source assembly 125 .

Light emitted from the light source array is incident on the side of the light guide plate 320, and the reflector 410 disposed on the rear surface of the light guide plate 320 reflects the light transmitted through the rear surface of the light guide plate 320 toward the light guide plate 320. so that the light is emitted in the direction of the display panel 100 .

Meanwhile, a typical liquid crystal display device includes a backlight unit that provides light to the display panel 100 , and the backlight unit includes a guide panel supporting the display panel 100 . Such a guide panel has a problem of complicating the structure of the backlight unit and increasing its weight and thickness. Accordingly, there is a need for a backlight unit capable of simplifying the structure of the backlight unit and reducing its weight and thickness.

To solve this problem, the display panel 100 is seated on a cover bottom 500 on the top of the backlight unit according to the present embodiment, and the display panel 100 and the backlight unit are placed on the lower cover bottom 500. and a top cover 600 at the top to form a display device.

Specifically, the display panel 100 according to the present embodiment may be seated on the cover bottom 500 having at least one side formed in a 'c' shape, and the side surface of the cover bottom 500 and the display panel 100 A top cover 600 may be provided to cover a part of the side surface and the upper surface of the ). That is, the top cover 600 covers the upper edge of the display panel 100 and the side surface of the cover bottom 500 .

Since the display panel 100 is seated on the cover bottom 500 as described above, the structure of the guide panel can be eliminated, and thus the structure of the backlight unit can be simplified. In addition, since the backlight unit of the display device according to the present embodiment does not include a guide panel, there is an effect of providing a light and thin backlight unit.

This configuration is reviewed in detail with reference to FIG. 2 as follows. FIG. 2 is a cross-sectional view of the display device of FIG. 1 taken along line A-B.

Referring to FIG. 2 , the display device according to the present embodiment includes a display panel 100, a cover bottom 500 disposed under the display panel 100, and a side surface of the cover bottom 500 and an upper side of the display panel 100. It includes a top cover 600 covering the edge.

The display panel 100 may include a lower substrate 111 , an upper substrate 112 , a lower polarizing plate 113 , and an upper polarizing plate 114 . Here, the lower substrate 111 may be a thin film transistor array substrate, and the upper substrate 112 may be a color filter array substrate, but the present embodiment is not limited thereto. For example, a color filter may be positioned on the lower substrate 111 . In addition, a lower polarizing plate 113 may be positioned on the rear surface of the lower substrate 111 , and an upper polarizing plate 114 may be positioned on the upper substrate 112 .

Also, although not shown in the drawings, a liquid crystal layer (not shown) may be interposed between the lower substrate 111 and the upper substrate 112 . As such, the display panel 100 may be a liquid crystal panel that selectively polarizes light, and in this case, a backlight unit may be disposed on the rear surface of the display panel 100 .

The backlight unit includes a top cover 600 , a cover bottom 500 , a reflector 410 , a light guide plate 320 , a plurality of optical sheets 430 and a holder 200 .

The cover bottom 500 includes a guide part 501 , an extension part 502 and a support part 503 for the display panel 500 . The guide portion 501 of the cover bottom 500 may extend in one direction. Also, the extension part 502 may extend from one end of the guide part 501 in a direction crossing the direction in which the guide part 501 extends. Also, the support part 503 may extend from one end of the extension part 502 in the same direction as the direction in which the guide part 501 extends.

The guide portion 501 of the cover bottom 500 may serve to support the display panel 100 . Also, a reflector 410 may be disposed on the support 503 of the cover bottom 500 . Also, a light guide plate 302 may be disposed on the reflector 410 . Also, a plurality of optical sheets 430 may be disposed on the light guide plate 302 .

The plurality of optical sheets 430 include a diffusion sheet 431 , a lower prism sheet 432 , an upper prism sheet 433 , and a protection sheet 434 . The diffusion sheet 431 disperses the light incident from the light guide plate 320 to prevent spots from occurring on the image displayed on the display panel 100 due to partial concentration of the light. Bends the angle vertically.

The upper and lower prism sheets 432 and 433 condense the light incident from the diffusion sheet 431 to uniformly distribute it over the entire surface of the display panel 100 . In addition, the protective sheet 434 may serve to protect the optical sheets 430 that are sensitive to dust or scratches and prevent movement of the optical sheets 430 when the backlight unit is transported.

Meanwhile, since at least one side of the cover bottom 500 has a structure in which the guide portion 501, the extension portion 502, and the support portion 503 are connected to each other, at least one side of the cover bottom 500 has a 'c' shape. shape can be made.

In this way, since at least one side of the cover bottom 500 is formed in a 'c' shape, a space may be provided between the guide part 501 and the fixing part 503 on at least one side of the cover bottom 500. . Also, the holder 200 may be disposed in a space provided between the guide part 501 and the fixing part 503 of the cover bottom 500 .

The holder 200 may serve to prevent movement by fixing the light guide plate 320 and the plurality of optical sheets 430 . In particular, the first fixing part 230 provided in the holder 200 may penetrate and fix the plurality of optical sheets 430 . In other words, since the first fixing part 230 provided in the holder 200 penetrates and fixes the plurality of optical sheets 430 in the vertical direction, movement of the plurality of optical sheets 430 may be prevented.

In addition, as the holder 200 is disposed in the space provided between the guide part 501 and the fixing part 503 of the cover bottom 500, the light guide plate 302 is positioned between the guide part 501 and the fixing part 503. It is possible to prevent the light guide plate 302 from moving into the provided space. In other words, as the holder 200 fills the space between the guide part 501 and the fixing part 503, the space in which the light guide plate 302 can move can be eliminated.

In addition, the light guide plate 302 may be prevented from moving due to a size change due to expansion or contraction of the light guide plate 302 . Specifically, the holder 200 is placed in close contact with the light guide plate 302 and presses the light guide plate 302 so that even if the size is deformed due to expansion or contraction of the light guide plate 302, the flow of the light guide plate 302 can be suppressed. There are possible effects.

The structure of the above-described holder 200 is specifically reviewed with reference to FIG. 3 as follows. 3 is a perspective view of the holder according to the first embodiment. In the description to be described later, a description overlapping with the configuration described above may be omitted.

Referring to FIG. 3 , the holder 200 according to the first embodiment includes a fastening part 240 , a connection part 220 , a first fixing part 210 and a second fixing part 230 . Here, the fastening part 240 extends in a first direction, and the connection part 220 extends from one side of the fastening part 240 and extends in a second direction (vertical direction) that crosses the first direction (horizontal direction). ) is extended to

In addition, the first fixing part 210 extends in the second direction on one surface of the fastening part 240, and the second fixing part 230 extends in the first direction on one surface of the connection part 220. That is, the first fixing part 210 may extend from the fastening part 240 in the same direction as the direction in which the connection part 220 extends. Also, the second fixing part 230 may extend from the connection part 220 in the same direction as the direction in which the fastening part 240 extends.

Here, the first fixing part 210 may serve to pass through and fix a plurality of optical sheets (not shown). Also, the second fixing part 230 may serve to prevent movement of the light guide plate (not shown).

In other words, the connecting portion 220 may be bent from the fastening portion 240 . Specifically, the connecting portion 220 may be bent in the second direction to have a groove A from the fastening portion 240 as shown in FIG. 3 . In another aspect, the fastening part 240 may be bent while having the groove A from the connection part 220 .

As described above, by providing the groove A in the region where the fastening part 240 and the connection part 220 of the holder 200 according to the first embodiment are bent, the fastening part 240 is bent in the second direction. can lose In addition, as the fastening part 240 is bent in the second direction, the first fixing part 210 extending from the fastening part 240 may also move in the second direction.

Through this, the first fixing part 210 can effectively fix the plurality of optical sheets (not shown). Specifically, the first fixing part 210 can adjust the height of the plurality of optical sheets (not shown). Accordingly, a plurality of optical sheets (not shown) may be variably fixed.

More specifically, the plurality of optical sheets (not shown) may contract or expand according to external conditions (eg, when heat is applied from a light source). That is, the plurality of optical sheets (not shown) may vary according to external conditions. Meanwhile, in the holder 200 according to the present embodiment, the fastening part 240 can be bent as much as the width B of the groove A, and accordingly, the first fixing part 210 also It can be bent as much as the width (B) of the groove (A). Accordingly, the first fixing unit 210 may fix the plurality of optical sheets (not shown) in accordance with the change in height of the plurality of optical sheets (not shown) so that they do not lift or wrinkle.

In addition, the first fixing part 210 may partially or entirely pass through and fix the plurality of optical sheets (not shown) in the height direction. In this way, the first fixing part 210 fixes the plurality of optical sheets (not shown) by penetrating some or all of them based on the height direction, thereby moving the plurality of optical sheets (not shown) in the first direction or in the first direction and Flow in the third direction, which is a direction crossing the second direction, can be prevented.

In other words, the plurality of optical sheets (not shown) may have fixing holes into which the first fixing parts 210 are inserted. That is, the first fixing parts 210 may be inserted into the fixing holes of the plurality of optical sheets (not shown).

Meanwhile, at least one surface of the first fixing unit 210 contacting a plurality of optical sheets (not shown) may be an inclined surface. At this time, since at least one surface of the first fixing unit 210 in contact with the plurality of optical sheets (not shown) is made of an inclined surface, the size of the fixing holes of the plurality of optical sheets (not shown) can be reduced. Therefore, Damage to the plurality of optical sheets (not shown) may be minimized.

Also, the second fixing part 230 extending from the connection part 220 may serve to fix the light guide plate (not shown). That is, the second fixing part 230 may serve to control the movement of the light guide plate (not shown). Meanwhile, the second fixing part 230 may be formed in a 'V' shape. In this case, since the second fixing part 230 is formed in a 'V' shape, it is possible to prevent the light guide plate (not shown) from being lifted or bent when the light guide plate (not shown) contracts or expands.

Specifically, the second fixing part 230 may be formed in a 'V' shape by connecting one end of the first region 231 and one end of the second region 232 . Accordingly, a predetermined space may be provided between the first region 231 and the second region 232 . In addition, since the second fixing part 230 extends only in a certain area of the connection part 220 and is disposed, an empty space may be provided between the connection part 220 and the light guide plate (not shown).

Also, the light guide plate (not shown) may be disposed in contact with or adjacent to other tongues of the first region 231 and the second region 232 . As such, since an empty space is provided between the connecting portion 220 and the light guide plate (not shown), a space in which the light guide plate (not shown) can move according to contraction or expansion of the light guide plate (not shown) is provided. This can be prevented from lifting or bending.

In addition, a hole 245 may be provided in the fastening part 240 of the holder 200 . In this case, the hole 245 may be provided in an area adjacent to the area where the first fixing part 210 is disposed. Since the holder 200 has the hole 245 , it may be confirmed whether the first fixing part 210 is properly inserted into the fixing holes of the plurality of optical sheets (not shown).

Meanwhile, the shape of the hole 245 provided in the fastening part 240 is not limited to the shape shown in FIG. 3 and may be formed in various shapes such as a polygon, an ellipse, or a circle.

In addition, a fastening groove 246 may be provided on the upper surface of the fastening part 240 of the holder 200 . At this time, the fastening groove 246 may be disposed in an area adjacent to the hole 245 . In addition, the fastening groove 246 may be disposed in a partial area of the bent area of the holder 200 . Through the fastening groove 246 provided in the fastening part 240, it can be fastened with the top cover (not shown).

Subsequently, the arrangement relationship of the holder 200, the light guide plate, the optical sheet, and the top cover according to the first embodiment will be reviewed with reference to the drawings. 4 is a cross-sectional view of the backlight unit according to the first embodiment. In the description to be described later, a description overlapping with the configuration described above may be omitted.

Referring to FIG. 4 , the holder 200 is disposed between the guide part 501 and the support part 503 of the cover bottom 500 . In addition, a protrusion 510 is provided on one surface of the guide portion 501 of the cover bottom 500 . At this time, the protrusion 510 may be provided in the direction in which the holder 200 is disposed. The protruding part 510 provided on the guide part 501 may be fastened to the fastening groove 246 of the holder 200 .

The first fixing part 210 provided on the fastening part 240 of the holder 200 may fix the plurality of optical sheets 430 . At this time, the plurality of optical sheets 430 are positioned between the first fixing part 210 and the second fixing part 230 .

Meanwhile, since at least one surface in contact with the first fixing part 210 and the plurality of optical sheets 430 is made of an inclined surface, the plurality of optical sheets 430 can be easily fastened to the holder 200 .

Specifically, the first fixing part 210 may be inserted into fixing holes 440 provided in the plurality of optical sheets 430 . In this case, the fixing holes 440 provided in the plurality of optical sheets 430 may be provided in some or all of the plurality of optical sheets 430 based on the height direction. Meanwhile, at least one surface of the first fixing part 210 where the first fixing part 210 and the plurality of optical sheets 430 come into contact with each other is made of an inclined surface, so that the plurality of optical sheets 430 are attached to the first fixing part 210. And it can be easily pushed between the second fixing part (230).

In other words, a space is provided between the first fixing part 210 and the second fixing part 230, and in order to fasten the plurality of optical sheets 430 to the first fixing part 210, the first fixing part ( 210) and the second fixing part 230, the plurality of optical sheets 430 may be pushed into the space. Meanwhile, the first fixing part 210 may be disposed at one end of the fastening part 240, and the other end of the fastening part 240 may be connected to the connecting part 220. Also, the plurality of optical sheets 430 may be pushed in a direction from the first fixing part 210 toward the connecting part 220 .

When the plurality of optical sheets 430 are pushed in the direction from the first fixing part 210 toward the connection part 220 , they may be pushed through the inclined surface of the first fixing part 210 . That is, the inclined surface of the first fixing part 210 may be provided in a direction corresponding to the direction in which the light guide plate 320 and the reflector 410 are disposed.

In this way, in the step of pushing the plurality of optical sheets 430 between the first fixing part 210 and the second fixing part 230, the plurality of optical sheets 430 are attached to the first fixing part 210. Since the plurality of optical sheets 430 pass through the inclined surface, the contact area between the plurality of optical sheets 430 and the first fixing part 210 is small, so that the plurality of optical sheets 430 are placed between the first fixing part 210 and the second fixing part 230. can be easily pushed into.

Here, the fact that the area where the plurality of optical sheets 430 come into contact with the first fixing part 210 is small means that the first fixing part 210 is inserted into the fixing hole 440 of the plurality of optical sheets 430 . This means that a phenomenon in which the optical sheet 430 is caught on the first fixing part 210 and the first fixing part 210 cannot be inserted into the fixing hole 440 can be prevented.

This configuration is reviewed with reference to FIG. 5 as follows. 5 is a perspective view illustrating a fastened form of a cover bottom, a holder, and an optical sheet according to the first embodiment. In the description to be described later, a description overlapping with the configuration described above may be omitted.

Referring to FIG. 5 , at least one side of the cover bottom 500 according to the first embodiment may be configured in a 'c' shape. Meanwhile, although not shown in the drawings, all four sides of the cover bottom 500 may be configured in a 'c' shape.

The holder 200 , the plurality of optical sheets 430 , the light guide plate 320 and the reflector 410 may be disposed between the guide part 501 and the support part 503 of the cover bottom 500 . At this time, the holder 200 has a groove into which the protruding part 510 provided in the guide part 501 of the cover bottom 500 is fastened, and the protruding part 510 provided in the guide part 501 is fastened to the groove. As a result, the holder 200 can be seated inside the cover bottom 500 .

In addition, the plurality of optical sheets 430 have fixing holes into which the first fixing parts 210 of the holder 200 are inserted, and the first fixing parts 210 fasten the plurality of optical sheets 430, A plurality of optical sheets 430 may be fixed by the holder 200 .

Meanwhile, although only one side of the backlight unit is shown in FIG. 5 , the above-described structure may be applied to all four sides of the backlight unit in the display device according to the present embodiment. However, in this embodiment, a configuration in which the above-described configuration is applied to at least one side of the backlight unit is sufficient.

Subsequently, referring to FIG. 6 , the backlight unit of the display device according to the second embodiment will be reviewed. 6 is a cross-sectional view of a backlight unit of a display device according to a second embodiment. The backlight unit of the display device according to the second embodiment may include the same elements as those of the above-described embodiment. A description overlapping with the above-described embodiment may be omitted. Also, the same components have the same reference numerals.

Referring to FIG. 6 , the backlight unit of the display device according to the second embodiment is different from the backlight unit of the display device according to the first embodiment in the structure of the holder 250 . Specifically, the holder 250 of the display device according to the second embodiment may further include a coupling part 260 extending from the second fixing part 230 .

At this time, the light guide plate 320 and the plurality of optical sheets 430 may be disposed on the coupler 260 . Meanwhile, the coupling part 260 may be made of a material having high reflectivity. Therefore, the coupling part 260 can replace the role of the reflector. However, the present embodiment is not limited thereto, and a reflector may be further provided between the coupler 260 and the light guide plate 320 .

6 shows a configuration in which a space 265 is provided between the coupling part 260 extending from the second fixing part 230 of the holder 250 and the support part 503 of the cover bottom 500, but this Examples are not limited thereto. For example, a space may not be provided between the coupling part 260 and the support part 503 .

Subsequently, referring to FIG. 7 , the backlight unit of the display device according to the third embodiment will be reviewed. 7 is a cross-sectional view of a backlight unit of a display device according to a third embodiment. The backlight unit of the display device according to the third embodiment may include the same elements as those of the previous embodiment. A description overlapping with the above-described embodiment may be omitted. Also, the same components have the same reference numerals.

Referring to FIG. 7 , the configuration of the backlight unit of the display device according to the third embodiment is different from that of the holder 300 and the plurality of optical sheets 431 of the display device according to the first embodiment. Specifically, the holder 300 of the display device according to the third embodiment does not pass through the plurality of optical sheets 431, and the first fixing part 212 of the holder 300 extends through the plurality of optical sheets 431. There is a difference in fixing by pressing the surface. That is, the first fixing part 212 may be disposed to contact the surfaces of the plurality of optical sheets 431 .

Since one surface of the first fixing part 212 of the holder 300 is formed as an inclined surface, the first fixing part 212 may have a vertex in a direction toward the plurality of optical sheets 431 . At this time, the surfaces of the plurality of optical sheets 431 may be pressed and fixed through the vertices of the first fixing part 212 . Therefore, since the plurality of optical sheets 431 do not have to have fixing holes into which the first fixing parts 212 are inserted, damage to the plurality of optical sheets 431 is prevented and at the same time, the plurality of optical sheets 431 are installed in the holder 300. The seat 431 may be fixed.

As such, since the guide part 501 of the cover bottom 500 can perform the role of the guide panel in the backlight unit of the display device according to the present embodiments, the configuration of the guide panel can be eliminated. Accordingly, the structure of the backlight unit can be simplified. In addition, the backlight unit of the display device according to the present embodiments has an effect of fixing the plurality of optical sheets 431 and the light guide plate 320 by including the holder 300 inside the cover bottom 500 .

The features, structures, effects, etc. described in the foregoing embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified with respect to other embodiments by those skilled in the art in the field to which the embodiments belong. Therefore, contents related to these combinations and variations should be construed as being included in the scope of the present invention.

In addition, although the embodiments have been described above, these are merely examples and do not limit the present invention, and those of ordinary skill in the field to which the present invention belongs can exemplify the above to the extent that does not deviate from the essential characteristics of the present embodiment. It will be seen that various variations and applications that have not been made are possible. For example, each component specifically shown in the embodiments can be modified and implemented. And differences related to these variations and applications should be construed as being included in the scope of the present invention as defined in the appended claims.

100: display panel
200: holder
320: light guide plate
410: reflector
500: cover bottom
600: top cover

Claims (13)

light guide plate;
a plurality of optical sheets disposed on the light guide plate;
a holder provided on at least one side of the light guide plate; and
A cover bottom disposed on rear surfaces of the light guide plate and the holder and covering a portion of the upper surface of the holder and a side surface of the holder;
The holder includes a first fixing part for fixing the plurality of optical sheets, a second fixing part for controlling the movement of the light guide plate, a fastening part extending vertically on the first fixing part and fastened to the cover bottom, and A connection part connecting the second fixing part and the fastening part,
The second fixing part protrudes in a 'V' shape in a vertical direction from an end of the connecting part.
According to claim 1,
The cover bottom includes a guide part, an extension part connected to one end of the guide part, and a support part extending in the same direction as the guide part and connected to the guide part through the extension part.
According to claim 2,
The cover bottom has a protruding portion protruding from the guide portion,
The backlight unit wherein the protruding part is fastened to a fastening groove provided on an upper surface of the fastening part.
According to claim 1,
The plurality of optical sheets have a fixing hole into which a first fixing part is inserted.
According to claim 1,
The backlight unit of claim 1 , wherein the fastening part of the holder has a hole in an area adjacent to the first fixing part.
According to claim 1,
The fastening part has a groove in the bent region,
The backlight unit of claim 1 , wherein the fastening portion is bent by a width of the groove.
According to claim 1,
A backlight unit in which the light guide plate is disposed on one side of the second fixing part.
According to claim 1,
The holder further includes a coupling portion extending in a horizontal direction from the second fixing portion,
A backlight unit in which the light guide plate is disposed on the coupling portion.
According to claim 1,
The backlight unit wherein the plurality of optical sheets are disposed between the first fixing part and the second fixing part of the holder.
According to claim 1,
The backlight unit of claim 1 , wherein a surface of the first fixing part corresponding to a direction in which the light guide plate is disposed is inclined.
According to claim 1,
The backlight unit of claim 1 , wherein the first fixing unit presses and fixes surfaces of the plurality of optical sheets.
delete display panel;
a light guide plate disposed on a rear surface of the display panel;
a plurality of optical sheets disposed between the light guide plate and the display panel;
a holder provided on at least one side of the light guide plate;
a cover bottom that supports the display panel, is disposed on rear surfaces of the light guide plate and the holder, and covers a portion of an upper surface of the holder and a side surface of the holder; and
A top cover covering an upper edge of the display panel and a side surface of the cover bottom;
The holder includes a first fixing part for fixing the plurality of optical sheets, a second fixing part for controlling the movement of the light guide plate, a fastening part extending vertically on the first fixing part and fastened to the cover bottom, and A connection part connecting the second fixing part and the fastening part,
The second fixing part protrudes in a 'V' shape in a vertical direction from an end of the connecting part.

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