KR101621536B1 - Backlight unit and display apparatus thereof - Google Patents

Abstract

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

The backlight unit includes: a plurality of light sources emitting light; A plurality of light guide plates for diffusing and emitting light incident from the light source; An optical sheet provided above the light guide plate and spaced apart from the light guide plate by a predetermined distance; And a spacing member at least partially provided between the light guide plate and the optical sheet.

Description

BACKLIGHT UNIT AND DISPLAY APPARATUS USING THE SAME

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

(PDP), Electro Luminescent Display (ELD), Vacuum Fluorescent Display (VFD), and the like have been developed in recent years in response to the demand for display devices. Display) have been studied and used.

Among them, a liquid crystal panel of an 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. Since there is no self-luminous force, the image is displayed using light provided from the backlight unit can do.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a backlight unit capable of improving the image quality of a display image and a display device using the same.

The backlight unit includes: a plurality of light sources emitting light; A plurality of light guide plates for diffusing and emitting light incident from the light source; An optical sheet provided above the light guide plate and spaced apart from the light guide plate by a predetermined distance; And a spacing member at least partially provided between the light guide plate and the optical sheet.

According to another aspect of the present invention, there is provided a backlight unit including: a plurality of light sources emitting light; A light guide plate including a light incident portion through which the light is incident from the light source and a light emitting portion that emits light upward from the light incident portion; An optical sheet provided above the light guide plate and spaced apart from the light guide plate by a predetermined distance; And at least a part of which is provided between the light guide plate and the optical sheet, wherein one of the plurality of light guide plates overlaps at least a part with another adjacent light guide plate.

According to another aspect of the present invention, there is provided a display device including: a plurality of light sources emitting light; A plurality of light guide plates including a light incident portion through which light incident from the light source is incident and a light emitting portion that emits the light upward; An optical sheet disposed above the light guide plate; At least a part of which is provided between the light guide plate and the optical sheet; A bottom cover to which the light guide plate and the optical sheet are fixed; A display panel positioned above the optical sheet to display an image using light emitted from the light guide plate; And a top cover surrounding the upper surface of the display panel, wherein a part of the light guide plate of the plurality of light guide plates overlaps with at least a part of another adjacent light guide plate.

According to a preferred embodiment of the present invention, a modular backlight unit including a plurality of light guide plates is used to provide light to a display panel, thereby reducing the thickness of a display device, the contrast of the display image can be improved by using a partial driving method such as dimming or impulsive.

There is an advantage that the overall power consumption of the display device can be reduced as the backlight unit is driven in a local dimming manner.

Also, since the spacing member is provided between the light guide plate and the optical sheet, the gap between the light guide plate and the optical sheet is maintained, and damage due to mutual friction between the light guide plate and the optical sheet can be prevented.

Hereinafter, the present invention will be described with reference to the accompanying drawings. Hereinafter, the embodiments may be modified into various other forms, and the technical scope of the embodiments is not limited to the embodiments described below. The embodiments are provided so that this disclosure may be more fully understood by those skilled in the art. Accordingly, the shape, size, etc. of elements in the figures may be exaggerated for clarity.

1 is an exploded perspective view showing a configuration of a display device according to a first embodiment of the present invention.

1, a display device 1 according to the present embodiment includes a display module 200, a front cover 300 and a back cover 400 surrounding the display module 200, a display module 200, And a fixing member 500 for fixing the front cover 300 and / or the back cover 400 to the front cover 300 and / or the back cover 400.

One side of the fixing member 500 is fixed to the front cover 300 by a fastening member such as a screw and the other side of the fixing member 500 supports the display module 200 to the side of the front cover 300, The display module 200 may be fixed with respect to the display module 200.

Although the fixing member 500 is described as being formed in a plate shape elongated in one direction in the present embodiment, the fixing member 500 may not be provided, It is also possible that the back cover 300 is fixed to the front cover 300 or the back cover 400.

FIG. 2 is a cross-sectional view illustrating the configuration of the display module of FIG. 1, and FIG. 3 is a plan view of a backlight unit.

2 and 3, the display module 200 includes a display panel 210 for displaying an image, a backlight unit 100 for providing light to the display panel 210, A panel supporter 240 for supporting the display panel 210 from below and a display panel 210 for supporting the display panel 210 from above and forming a rim of the display module 200 (Not shown).

The bottom cover 110 may be formed in a box shape having an opened upper surface so that the backlight unit 100 can be housed. One side of the bottom cover 110 may be fixed to one side of the top cover 230. For example, a fastening member such as a screw penetrates the side of the display module 200, that is, the side where the bottom cover 110 and the top cover 230 are overlapped with each other so that the bottom cover 110 and the top cover 230 Can be fixed.

At least one substrate 250 is mounted on the bottom surface of the bottom cover 110 to allow the display module 200 to be driven by an external signal such as a video signal.

The substrate 250 may be a timing controller (T-con board) or a main PCB. The substrate 250 may be fixed to the back surface of the bottom cover 110 by a fastening member such as a screw, Can be fixed by a member.

Although not shown in detail, the display panel 210 may include a lower substrate 211 and an upper substrate 222 that are bonded together to maintain a uniform cell gap so as to face each other, and a liquid crystal layer (not shown) interposed between the two substrates. . A plurality of gate lines and a plurality of data lines intersecting the plurality of gate lines are formed on the lower substrate 211, and a thin film transistor (TFT) may be formed on the intersections of the gate lines and the data lines. have.

Color filters may be formed on the upper substrate 212. The structure of the display panel 210 is not limited thereto, and the display panel 210 may have various structures. As another example, the lower substrate 211 may include a color filter as well as a thin film transistor. In addition, the display panel 210 may have various structures depending on the method of driving the liquid crystal layer.

Although not shown, a gate driving printed circuit board (PCB) for supplying a scan signal to a gate line is provided at an edge of the display panel 210, a data driving printed circuit board (PCB) May be provided. On the other hand, a polarizing film (not shown) may be disposed on at least one of the upper side and the lower side of the display panel 210.

An optical sheet 220 may be disposed between the display panel 210 and the backlight unit 100 and the optical sheet 220 may include a diffusion sheet (not shown) and / or a prism sheet (not shown) .

The diffusing sheet diffuses the light projected from the light guide plate evenly, and the diffused light can be converged on the display panel by the prism sheet. Here, the prism sheet may be selectively formed using a horizontal or vertical prism sheet, one or more roughness enhancing films, or the like. The types and the number of the optical sheets 220 can be added or deleted within the technical scope of the embodiments, but the invention is not limited thereto.

Meanwhile, the backlight unit 100 may be configured to include a plurality of optical assemblies, each of which includes a light source 13 and a light guide plate 15, and a spacing member 18.

The light source 13 is located on the side surface of the light guide plate 15 and the light emitted from the light source 13 can be incident on the side surface of the light guide plate 15. For example, the light source 13 may be configured using a light emitting diode (LED), and may include a plurality of light emitting diodes (LEDs).

The light guide plate 15 may refract and scatter light incident from the light source 13 to emit light toward the upper side, that is, toward the display panel 210. Further, a reflection member (not shown) may be formed on the lower side of the light guide plate 15.

Therefore, the upper surface of the light guide plate 15 may be formed as a plane in which a uniform plane or a uniform pattern is formed so that the emitted light can be uniformly projected to the outside.

The light guide plate 15 is made of a transparent material and may include one of acrylic resin such as PMMA (polymethyl methacrylate), polyethylene terephthalate (PET), polycarbonate (PC), and polyethylene naphthalate . The light guide plate 15 may be formed by an extrusion molding method.

The light source 13 and the light guide plate 15 shown in FIG. 1 are mainly shown with respect to their respective functions. The shape, the coupling structure or the positional relationship of the light source 13 and the light guide plate 15 can be changed Do.

For example, the two light guide plates 15 adjacent to each other may partially overlap each other. For example, the light guide plate 15 may have a shape in which the thickness gradually decreases in one direction.

The display panel 210 may have a plurality of divided regions corresponding to the plurality of light guide plates 15 and may be configured to have a plurality of divided regions corresponding to the brightness of light emitted from the light guide plate of the corresponding optical assembly according to the gray peak value or the color coordinate signal of the divided region, That is, the brightness of the light source is adjusted, so that the brightness of the display panel 210 can be adjusted.

Meanwhile, the plurality of optical assemblies 10 provided in the backlight unit 100 may be arranged in a matrix of N and M (N and M are natural numbers of 1 or more) in the x-axis and y-axis directions respectively, Each optical assembly 10 may include a light source 13 and a light guide plate 15.

Each optical assembly 10 is driven in an edge-type backlight manner in which the light source 13 irradiates light in one direction of the light guide plate 15 in the first direction (y-axis direction), and each optical assembly 10 And as a single light source, a plurality of optical assemblies 10 are arranged in a direct-backlight manner to form a backlight unit.

Accordingly, it is possible to solve the problem that the light emitting diodes are observed as hot spots on the screen, reduce the thickness of the light guide plate, and reduce the number of optical films, thereby realizing slimming of the backlight unit.

For example, as shown in FIG. 3, the backlight unit 100 may have nine optical assemblies (M1 to M9) arranged in a 3x3 array. However, since the configuration shown in FIG. 3 is only an example for describing the backlight unit according to the present invention, the present invention is not limited thereto and can be changed according to the screen size and the like of the display device.

Each optical assembly 10 may be fabricated as an independent assembly and may be closely spaced to form a modular backlight unit. Such a modular backlight unit can provide light to the display panel 210 as backlight means.

The backlight unit 100 may be driven by a whole driving method or a partial driving method such as local dimming, impulsive, or the like. The driving method of the light emitting diode may be variously changed according to the circuit design, but is not limited thereto. Thus, in the embodiment, the color contrast ratio is increased and the image of the bright part and the dark part on the screen can be expressed clearly, thereby improving the image quality.

That is, the backlight unit 100 is divided into a plurality of divided driving regions corresponding to the plurality of light guide plates 15, and the luminance of the divided driving region is associated with the luminance of the video signal, And the bright portion increases the brightness, thereby improving the contrast ratio and sharpness.

For example, only some of the optical assemblies 10 of M1 to M9 shown in FIG. 3 may be independently driven to emit light upwardly, and the light sources (not shown) included in each of the optical assemblies 10 13 can be independently controlled.

On the other hand, the area of the display panel 210 corresponding to one optical assembly 10 or one light guide plate 15 can be divided into two or more blocks, and the display panel 210 and the backlight unit can be divided into blocks Can be driven.

As shown in Fig. 3, the optical assemblies 10 adjacent to each other can be arranged with a constant distance d1, d2. For example, the two light guide plates 15 adjacent to each other in the x direction, that is, the lateral direction, may be disposed at intervals of the first boundaries d1 having a predetermined size, and the two light guide plates 15 adjacent to each other in the y direction, And may be disposed at intervals of the second boundary portions d2 of a predetermined size.

The upper surface of the light guide plate 15 of the optical assembly 10 and the optical sheet 220 may be in contact with the light guide plate 15 and the optical sheet 220, The light guide plate 15 or the optical sheet 22 formed in a uniform surface or pattern is separated by a predetermined distance d3 in the vertical direction.

The spacing members 18 are provided between the light guide plate 15 and the optical sheet 220 so that when external vibration or internal vibration is applied to the display module 10, And the optical sheet 220 are brought into contact with each other, thereby preventing scratches from occurring between each other.

Hereinafter, the configuration of the spacing member 18 will be described in detail.

FIG. 4 is a view showing a spacer member of FIG. 2. FIG.

4, the spacing member 18 according to the present embodiment may be formed of a resilient material such as polycarbonate, acrylic, or silicone resin, And an inserting portion 182, as shown in Fig.

The height d4 of the head portion 181 may be greater than the height d4 of the optical sheet 181. In this case, 220) and the light guide plate (15).

The width d5 of one side of the head portion 181 is larger than the width of the first boundary portion d1 and the second boundary portion d2 between the light guide plates.

The insertion portion 182 extends downward from one side of the head portion 181 and the thickness of the insertion portion 182 is set so that the thickness of the first boundary portion d1 and the second boundary portion d2 Width.

Although the head portion 181 is described as being hemispherical in this embodiment, the head portion 181 may be removed in a space between the light guide plates 15, such as a polygonal or spherical shape such as a rectangular parallelepiped having a predetermined size And may be formed in any shape to prevent contact between the light guide plate 15 and the optical sheet 220.

Hereinafter, the configuration of the spacer member 18 in the backlight unit 100 will be described in detail.

2 to 4, a plurality of the spacing members 18 are provided, and the plurality of spacing members 18 are spaced apart from each other in the longitudinal direction (y-axis direction) of the backlight unit 100, (d1) and a second boundary portion (d2) formed in the lateral direction (x-axis direction).

The size of the spacing member 18 and the size of the light guide plate 15 and the optical sheet 220 (see FIG. 1) are different from each other, And a plurality of spacers may be disposed between the light guide plates 15 in accordance with the distance between the light guide plates 15.

At least a part of the head part 181 is seated on the edge side of one of the light guide plates 15 and the other part of the head part 181 is seated on the side of the light guide plate 15 And is supported on the edge side of the other light guide plate 15 adjacent thereto.

The insertion portion 182 is inserted into the boundary portions d1 and d2 in a state in which the head portion 181 is seated on the light guide plate 15 and is detached at a position where the spacing member 18 is seated .

In the case where a plurality of spacing members 18 are arranged between the light guide plate 15 and the optical sheet 220 and vibration of the backlight unit 220 due to an unexpected external force is applied, The optical sheet 220 and the optical sheet 220 can be separated from each other by the spacing member 18.

According to a preferred embodiment of the present invention, a modular backlight unit including a plurality of light guide plates is used to provide light to a display panel, thereby reducing the thickness of a display device, the contrast of the display image can be improved by using a partial driving method such as dimming or impulsive.

There is an advantage that the overall power consumption of the display device can be reduced as the backlight unit is driven in a local dimming manner.

Also, since the spacing member is provided between the light guide plate and the optical sheet, the gap between the light guide plate and the optical sheet is maintained, and damage due to mutual friction between the light guide plate and the optical sheet can be prevented.

5 is a plan view showing a configuration of a backlight unit according to a second embodiment of the present invention.

The present embodiment differs from the configuration in which the spacer is disposed in the backlight unit. In the other configurations, the configuration is the same as that in the first embodiment. Therefore, the characteristic portions of this embodiment will be mainly described.

Referring to FIG. 5, the spacing member 18 according to the present embodiment is provided at a position where the four light guide plates 15 are located, that is, at a position where the respective edges of the four light guide plates 15 face each other.

Therefore, a part of one side of the spacing member 18 is seated on the corner of each of the four light guide plates 15, and the position thereof can be maintained.

6 is a cross-sectional view illustrating a configuration of a backlight unit according to a third embodiment of the present invention.

The present embodiment is different from the first embodiment in the configuration of the optical assembly, and the remaining configuration is the same as that of the first embodiment, and therefore, the characteristic portion of this embodiment will be mainly described.

6, the optical assembly 10 includes a light source 13, a light guide plate 15, a reflecting member 17, a spacing member 18 and a side cover (not shown) for fixing the light source 13 and the light guide plate 15 20). Meanwhile, the side cover 20 provides a fixing position for the bottom cover 110, and may include a first side cover 21 and a second side cover 22.

The light guide plate 15 may be composed of a first part 15b and a second part 15a and the second part 15a may be composed of an upper surface on which the surface light source is generated and a lower surface opposed to the upper surface, .

The first part 15b may protrude horizontally along the lower side of one of the side surfaces of the second part 15a. Here, the first part 15b is a light-incident part through which the light is incident from the light source 13, and the second part 15a emits the light incident on the side through the light- As shown in Fig.

According to an embodiment of the present invention, optical assemblies 10 adjacent to each other, more specifically, two light guide plates 15 adjacent to each other may be arranged so that predetermined regions overlap each other.

For example, a light source 13, a first part 15b, that is, a light entrance part and a side cover 20 are disposed on one side of the optical assembly 10, and the light source 13, The first part 15b and the side cover 20 are disposed adjacent to the optical assembly 10 and more specifically the second part 15a of the light guide plate 15 provided in the optical assembly, .

The plurality of optical assemblies 10 are partially overlapped as described above, so that the light source 13, the first part 15b, and the side cover 20 are not observed from the front surface.

As described above, since the adjacent optical assemblies 10 included in the backlight unit 100 are arranged so as to overlap with each other, it is possible to improve the bright line or dark line generation at the boundary of the optical assemblies 10 and to secure uniformity of light .

On the other hand, the second part 15a of the light guide plate 15, that is, the lower surface of the light emitting part is formed to be inclined at a predetermined angle, and the thickness of the second part 15a may gradually decrease toward the opposite side from the part adjacent to the first part 15b.

The second part 15a of the light guide plate 15 is divided into a first spacing distance d1 or a second spacing distance d2 of the second part 15a of another adjacent light guide plate 15, The spacing member 18 is located at the first and second spacing distance d2 to prevent the light guide plate 15 from contacting the optical sheet 220. [

The light guide plate 15 may be provided with a reflective member 17 and the reflective member 17 is guided inside the light guide plate 15 by the light incident on the side through the first part 15b, So that it can be projected upward. In addition, the reflective member 17 may interfere with interference caused by the light generated in the other optical assemblies 10 arranged in a superimposed manner.

7 is a view showing the light guide plate of FIG.

6 and 7, the light guide plate 15, more specifically, the first part 15b of the light guide plate 15 may include a protrusion 30 protruding at a predetermined height a. The protrusions 30 may be formed in at least two places in the x-axis direction on the upper surface of the first part 15b of the light guide plate 15. [

The protrusion 30 may have various shapes, for example, a shape similar to a rectangular parallelepiped. The projections 30 are engaged with the first side cover 21 to prevent shaking of the light guide plate 15 in the x- and y-axes.

A part 30a of the projection 30 may be formed in a round shape to prevent a crack from being generated in the projection due to the impact applied to the projection 30 by the movement of the light guide plate 15. [

Meanwhile, the protrusion 30 may have a height a of 0.3 to 0.6 mm from the upper surface of the first part 15b. The width b of the projection 30 in the x axis may be 2 to 5 mm. The width c of the projection 30 in the y-axis may be 1 to 3 mm.

The protrusions 30 may be disposed between adjacent light emitting diodes 11 and may be formed in the vicinity of the light incidence surface 16 on the upper surface of the first part 15b so that light generated in the light emitting diodes 11 It is possible to prevent optical interference from being generated due to the protrusion 30 formed integrally with the light guide plate 15.

The light source 13 may include a module substrate 12 on which at least one light emitting diode 11 and a light emitting diode 11 are mounted. The light emitting diodes 11 may be arranged in the x-axis direction on the module substrate 12 and disposed close to the light incidence surface 16 of the first part 15b.

The module substrate 12 is composed of a metal core PCB, an FR-4 PCB, a general PCB, a flexible substrate, and the like, and can be variously modified within the technical scope of the embodiment. A thermal pad (not shown) may be disposed under the module substrate 12. The heat dissipating member may be formed between the module substrate 12 and the second side cover 22.

The light generated from the light emitting diode 11 is incident on the first part 15b. The light incident from the light emitting diodes 11 may be mixed in the light guide plate 15 including the first part 15b.

 The light incident from the light emitting diodes 11 is guided in the first part 15b and is incident on the second part 15a. The light incident on the second part 15a is reflected by the reflective member 17 on the lower surface and projected onto the upper surface. At this time, light is scattered and diffused by the scattering pattern formed on the lower surface of the light guide plate 15, so that the light uniformity can be improved.

The light emitting diodes 11 may be arranged on the module substrate 12 at predetermined intervals. The light emitting diodes 11 may be arranged diagonally with respect to the projections 30 in order to minimize the optical effect of the protrusions 30 formed on the light guide plate 15. [ The spacing of the light emitting diodes 11 around the projections 30 may be wider than the spacing of the other light emitting diodes 11. [

A space for coupling the first side cover 21 and the second side cover 22 is ensured and the light emitting diodes 11 are arranged in order to minimize the optical influence that may be caused by the pressing of the light guide plate 15 by the coupling force. The distance between some of the light emitting diodes 11 may be wider than the distance between the other light emitting diodes 11.

For example, if the first spacing d of the adjacent light emitting diodes 11 is about 10 mm, the second spacing e of the light emitting diodes 11 near the location where the space for the coupling is provided may be about 13 mm .

The light generated by the light emitting diodes 11 may be mixed in the light guide plate 15 including the first part 15b and uniformly supplied to the second part 15a.

A side cover 20 is formed to surround a part of the light source 13 and the light guide plate 15 and the side cover 20 is disposed on the light source 13 and the first part 15b of the light guide plate 15 And a second side cover 22 disposed below the first part 15b. The side cover 20 may be made of plastic or metal.

The second side cover 22 is formed to face the lower surface of the first part 15b. The second side cover 22 may be formed by being bent in the upper direction (z-axis line) so as to face the light incidence surface 16 at the lower surface of the first part 15b. A part 22a of the second side cover 22 may be inclined along the lower surface of the light guide plate 15 or a part of the inclined surface and the light source 13 may be accommodated in the second side cover 22. [

The first side cover 21 and the second side cover 22 are fastened to each other by the first fixing member 51 so that the light source 13 and the light guide plate 15 are not shaken by an external impact, So that shaking can be prevented.

The second side cover 22 can support the inclined surface of the light guide plate 15 to firmly maintain alignment of the light guide plate 15 and the light source 13 and protect the light guide plate 15 and the light source 13 from external impacts.

The first side cover 21 may have a first hole 41 at a position corresponding to the projection 30 of the first part 15b.

The first hole 41 may be larger than the projection 30 so that the projection 30 is engaged with the projection 30. The circumference of the first hole 41 may be spaced apart from a part of the edge of the protrusion 30 by a predetermined distance. The space may be formed in the light guide plate 15 when the light guide plate 15 expands due to a change in external environment, And may be a margin for preventing the deformation of the base 15. At this time, another portion of the projection 30 may contact the periphery of the first hole to enhance the fixing force.

At least one second hole (42) may be further formed in the first side cover (21). At least one third hole 43 may be formed in the second side cover 21 at a position corresponding to the second hole 42.

The backlight unit 100 having the above-described structure may be housed in a box-shaped bottom cover having an opened upper side.

8 is a cross-sectional view illustrating a configuration of a backlight unit according to a fourth embodiment of the present invention.

The present embodiment is different from the second embodiment in the configuration of the spacing member, and is the same as the second embodiment in the other configurations. Therefore, the characteristic configuration of this embodiment will be mainly described.

8, the spacing member 18 according to the present embodiment includes a first support portion 183 and a second support portion 183 extending from the insertion portion 182 toward the first part 15a side of the light guide plate 15, 184).

More specifically, the first support portion 183 is supported on the upper surface of the first part 15a in a state where the spacing member 18 is positioned at the boundary portion d2. The second support portion 184 supports the bottom surface of the optical sheet 17 toward the lower surface of the first part 15a.

That is, the optical sheet 17 is inserted into the space between the first support portion 183 and the second support portion 184 on the end face of the first part 15a and the bottom face of the end portion of the optical sheet 17.

Therefore, the first and second support portions 183 and 184 can prevent the separation member 18 from being detached at a fixed position. As the second support portion 184 presses the scientific sheet 17 toward the first part 15a, the end of the optical sheet 17 is brought into contact with the lower surface of the first part 15a The state can be maintained.

9 is a cross-sectional view showing a configuration of a backlight unit according to a fifth embodiment of the present invention.

The present embodiment is different from the first embodiment in the configuration of the spacing member 18, and is the same as the first embodiment in the other configurations, and therefore, the characteristic portions of this embodiment will be mainly described.

9, the spacing member 18 according to the present embodiment includes a head portion 181 that forms the outer shape of the spacing member 18.

A part of the lower surface of the head part 181 is seated on the edge of one of the light guide plates 15 and the other part is seated on the edge of the other light guide plate 15 adjacent to the light guide plate 15.

An adhesive member 186 is provided on the lower surface of the head portion 181 to fix the spacing member 18 firmly to the light guide plate 15, for example.

According to the present embodiment, since the inserting portion inserted into the boundary portion of the spacer 18 is not formed, the spacer may be formed to be very small or the spacer 18 may easily be formed even when the light guide plate 15 contacts with each other. There is an advantage that it can be located.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications other than those described above are possible. For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

1 is an exploded perspective view showing a configuration of a display device according to a first embodiment of the present invention.

2 is a cross-sectional view showing the configuration of the display module of FIG.

3 is a plan view schematically showing the configuration of the backlight unit.

FIG. 4 is a view showing a spacer member of FIG. 2. FIG.

5 is a plan view showing a configuration of a backlight unit according to a second embodiment of the present invention.

6 is a cross-sectional view illustrating a configuration of a backlight unit according to a third embodiment of the present invention.

7 is a view showing the light guide plate of FIG.

8 is a cross-sectional view illustrating a configuration of a backlight unit according to a fourth embodiment of the present invention.

9 is a cross-sectional view showing a configuration of a backlight unit according to a fifth embodiment of the present invention.

Claims (15)

A plurality of light sources emitting light; A plurality of light guide plates for diffusing and emitting light incident from the light source; An optical sheet provided above the light guide plate and spaced apart from the light guide plate by a predetermined distance; At least a part of which is provided between the light guide plate and the optical sheet and is provided with a clearance between the optical sheet and the optical sheet without contacting the optical sheet so as to prevent friction between the light guide plate and the optical sheet, A spacer member; A bottom cover for supporting the lower side of the light guide plate and the lower side of the optical sheet in a state in which the light guide plate and the optical sheet are separated from each other by a predetermined distance; And And a side cover which is fixed to the bottom cover and supports the upper side of the light guide plate and restrains the upward movement of the light guide plate. The method according to claim 1, The light- A light incident portion including an incident surface on which the light is incident; And And a light emitting portion for emitting upwardly the light incident on the light-entering portion, Wherein a light incident portion of one of the light guide plates overlaps at least a part of the light emitting portion of the other light guide plate in two adjacent light guide plates among the plurality of light guide plates. A plurality of light sources emitting light; A light guide plate including a light incident portion through which the light is incident from the light source and a light emitting portion that emits light upward from the light incident portion; An optical sheet provided above the light guide plate and spaced apart from the light guide plate by a predetermined distance; At least a part of which is provided between the light guide plate and the optical sheet and is provided with a clearance between the optical sheet and the optical sheet without contacting the optical sheet so as to prevent friction between the light guide plate and the optical sheet, A spacer member; A bottom cover for supporting the lower side of the light guide plate and the lower side of the optical sheet in a state in which the light guide plate and the optical sheet are separated from each other by a predetermined distance; And And a side cover which is fixed to the bottom cover and supports the upper side of the light guide plate and restrains the upward movement of the light guide plate, The light guide plate of any one of the plurality of light guide plates overlaps at least a part with another adjacent light guide plate, Wherein the spacing member is made of a resilient member having elasticity so that the optical sheet and the light guide plate can always be protected from damage when the optical sheet collides with the optical sheet. The method according to claim 1 or 3, A boundary is formed between one of the plurality of light guide plates and the other one of the light guide plates adjacent to the light guide plate, And the spacing member is provided at the boundary. 5. The method of claim 4, Wherein at least a part of the spacing member is seated on one light guide plate of the plurality of light guide plates and the other part of the spacer member is seated on another light guide plate adjacent to the light guide plate. 6. The method of claim 5, Wherein the spacing member further includes an insertion portion extending downward on one side of the head portion and inserted into a boundary portion between at least two adjacent light guide plates. delete 6. The method of claim 5, And the width of one side of the spacing member is larger than the width of the boundary. 6. The method of claim 5, Wherein the head portion is formed as a hemisphere with its rounded portion facing upward. The method according to claim 2 or 3, Wherein the light emitting portion is inclined upward from one side connected to the light-incident portion toward the other side. The method according to claim 1 or 3, The light guide plate further includes a reflection member for reflecting the light so that the incident light is projected upward, Wherein the spacing member includes a first support portion supported on the upper side of the light guide plate and a second support portion contacting the lower side of the reflection member and supporting the reflection member toward the light guide plate side. The method according to claim 1 or 3, Wherein the side cover surrounds a part of an upper surface side of the light guide plate and a part of a lower side surface of the light guide plate, and the light source is housed in an inner space. A plurality of light sources emitting light; A plurality of light guide plates including a light incident portion through which light incident from the light source is incident and a light emitting portion that emits the light upward; An optical sheet disposed above the light guide plate; At least a part of which is provided between the light guide plate and the optical sheet and is provided with a clearance between the optical sheet and the optical sheet without contacting the optical sheet so as to prevent friction between the light guide plate and the optical sheet, A spacer member; A bottom cover for supporting the lower side of the light guide plate and the lower side of the optical sheet in a state in which the light guide plate and the optical sheet are separated from each other by a predetermined distance; A side cover which is fixed to the bottom cover and supports the upper side of the light guide plate to restrain the upward movement of the light guide plate; A display panel positioned above the optical sheet to display an image using light emitted from the light guide plate; And And a top cover surrounding the top surface of the display panel, Wherein a part of the light guide plate among the plurality of light guide plates overlap with at least a part of another adjacent light guide plate. 14. The method of claim 13, And at least one substrate provided on a rear surface of the bottom cover. 14. The method of claim 13, Wherein the display panel is divided into a plurality of regions and a brightness of light emitted from a light guide plate corresponding to the region is adjusted according to a gray level peak value or a color coordinate signal of each of the plurality of regions.

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