KR101820693B1 - backlight unit and display apparatus using the same - Google Patents

Abstract

And a stopper disposed between the light source module and the light guide plate, wherein the light guide plate has a stopper fastening portion at a lower portion thereof and a stopper fastening portion between the light source module and the light guide plate, And the stopper may be coupled to the stopper engaging portion which is in contact with the light guide plate.

Description

BACKLIGHT UNIT AND DISPLAY APPARATUS USING THE SAME

An embodiment relates to a backlight unit and a display device using the same.

Typically, typical large-sized display devices include a liquid crystal display (LCD), a plasma display panel (PDP), and the like.

Unlike a self-luminous PDP, a backlight unit is indispensable because of the absence of its own light emitting device.

The backlight unit used in the LCD is divided into an edge type backlight unit and a direct-type backlight unit according to the position of the light source. In the edge type, a light source is disposed on the right and left sides or upper and lower sides of the LCD panel, Since the light is uniformly distributed over the surface, uniformity of light is good and the thickness of the panel can be made very thin.

The direct-type method is generally used for a display of 20 inches or more, and since the light source is arranged at a lower portion of the panel, the light efficiency is higher than that of the edge method. Thus, it is mainly used for a large display requiring high brightness.

CCFL (Cold Cathode Fluorescent Lamp) is used as a light source of the backlight unit of the conventional edge method or direct-down type.

However, since the backlight unit using CCFL is always supplied with power to the CCFL, a considerable amount of power is consumed, and a color reproduction ratio of about 70% as compared with CRT and environmental pollution problems caused by the addition of mercury are pointed out as disadvantages.

BACKGROUND ART [0002] As a substitute product for solving the above problem, researches on a backlight unit using an LED (Light Emitting Diode) have been actively conducted.

When the LED is used as a backlight unit, it is possible to partially turn on / off the LED array, thereby drastically reducing the power consumption. In the case of the RGB LED, the color reproduction range specification exceeding 100% of the National Television System Committee (NTSC) So that a more vivid image quality can be provided to the consumer.

1 is a sectional view showing a general backlight unit.

1, the backlight unit includes a light guide plate 20, a reflector 30, an optical member 40, a light source module 50, .

The backlight unit may further include a top chassis 60, a bottom chassis 10, and a panel guide module 80.

The panel guide module 80 can support the display panel 90 and the top chassis 60 can be connected to the panel guide module 80 and the bottom chassis 10.

The light guide plate 20 is formed with at least one groove 24 on the lower surface thereof and an optical member 40 on the upper surface thereof.

Next, the light source module 50 includes a light source 52 arranged on the substrate 54 and the substrate 54, and the light source module 50 can be disposed in the groove 24 of the light guide plate 20.

Since the light source module 50 is disposed in the grooves 24 of the light guide plate 20, the backlight unit having such a structure can prevent the light source module 50 from moving in a predetermined position Can be separated.

As described above, if the position of the light source module 50 becomes unstable due to the internal and external environment, the brightness of the backlight unit becomes uneven and the overall reliability may deteriorate.

Embodiments provide a backlight unit capable of stably fixing a light source module using a stopper having a predetermined shape and a fastening member thereof, and a display device using the backlight unit.

The light guide plate includes a light guide plate, a light source module disposed in the groove of the light guide plate, and a stopper disposed between the light source module and the light guide plate. The engaging member can be disposed and engaged with the stopper engaging portion.

Here, the stopper fastening portion may be disposed adjacent to the groove of the light guide plate, and the stopper fastening portion may be disposed correspondingly between the light sources of the light source module.

Further, the stopper coupling portion may be a projection projecting from a lower portion of the light guide plate, or a hollowness formed in a lower portion of the light guide plate.

The stopper fastening portion may have a planar shape of at least one of circular, hemispherical, triangular, rectangular, and polygonal.

The stopper coupling part may be made of a material such as PMMA (polymethylmethacrylate), PET (polyethylene terephthlate), COC (Cyclic Olefin Copolymers), PEN (polyethylene naphthalate), PC (Polycarbonate), PS ), And MS (Mathacylate styrene) resin.

Next, the stopper engaging portion may have the same thickness as the engaging member, and the stopper engaging portion may have a thickness greater than that of the engaging member.

Then, the side surface of the stopper coupling portion and the side surface of the light guide plate may be located on the same plane.

The coupling member may include a body portion supporting the stopper and the light source module, and a coupling portion projecting from the body portion and coupled to the stopper coupling portion.

Here, the coupling portion may include a first segment protruding from the body portion in the first direction and a second segment bent in the second direction perpendicular to the first direction from the end of the first segment.

At this time, the thickness of the first segment may be thicker than the body portion and may be the same as the second segment, or the thickness of the first segment is thicker than the body portion and the second segment, and the thickness of the second segment is the same as the body portion can do.

In addition, the coupling portion may be at least one, and one coupling portion may be coupled to the one stopper coupling portion in a one-to-one correspondence, or a plurality of coupling portions may be provided, and the two coupling portions may be disposed and interposed between the adjacent stopper coupling portions. have.

The engaging portion may then include a first segment projecting from the body portion and a second segment extending from an end of the first segment and having an area larger than the first segment.

The planar shape of the first and second segments may be the same as the planar shape of the stopper fastening portion.

Embodiments can stabilize the light source module and improve the reliability of the backlight unit by forming a stopper between the light guide plate and the light source module and fastening the stopper to the light guide plate.

1 is a cross-sectional view showing a typical backlight unit
2 is a cross-sectional view showing a backlight unit according to an embodiment
3 and 4 are views showing a stopper arranged in the groove of the light guide plate
5 is a structural cross-sectional view showing the engagement of the engagement member and the stopper engagement portion according to the first embodiment
6A is a bottom perspective view showing the stopper fastening portion of FIG. 5;
FIG. 6B is a bottom perspective view showing the coupling member of FIG.
Figure 6c is a bottom perspective view showing the engagement of the engagement member and the stopper engagement portion of Figure 5;
7 is a structural cross-sectional view showing the engagement of the engagement member and the stopper engagement portion according to the second embodiment
Figure 8a is a bottom perspective view showing the coupling member of Figure 7;
8B is a structural cross-sectional view showing the coupling member of Fig.
9 is a structural cross-sectional view showing the engagement member and the stopper fastening portion according to the third embodiment are coupled
FIG. 10A is a bottom perspective view showing the coupling member of FIG.
10B is a structural cross-sectional view showing the coupling member of FIG.
11A is a bottom perspective view showing the stopper fastening portion according to the fourth embodiment.
FIG. 11B is a bottom perspective view showing the engaging member according to the embodiment of FIG.
11C is a bottom perspective view showing the engagement member and the stopper fastening portion according to the fourth embodiment are engaged.
12A is a bottom perspective view showing the stopper fastening portion according to the fifth embodiment.
FIG. 12B is a bottom perspective view showing the engaging member according to the embodiment of FIG.
12C is a bottom perspective view showing the engagement member and the stopper fastening portion according to the fifth embodiment are engaged.
13 is a plan view showing an area in which the stopper fastening portion according to the embodiment is disposed;
14 is a view showing a display module having a backlight unit according to an embodiment
15 and 16 are views showing a display device according to an embodiment

Hereinafter, embodiments will be described with reference to the accompanying drawings.

In the description of the present embodiment, in the case of being described as being formed "on or under" of each element, the upper (upper) or lower (lower) on or under includes both the two elements being directly in contact with each other or one or more other elements being indirectly formed between the two elements.

Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

2 is a cross-sectional view illustrating a backlight unit according to an embodiment.

2, the backlight unit includes a stopper coupling part 26, a light guide plate 20, a reflector 30, an optical member 40, a light source module 40, a source module 50, a coupling member 72, and a stopper 70.

The backlight unit may further include a top chassis 60, a bottom chassis 10, and a panel guide module 80.

The panel guide module 80 can support the display panel 90 and the top chassis 60 can be connected to the panel guide module 80 and the bottom chassis 10.

The light guide plate 20 is formed with at least one groove 24 on the lower surface thereof and an optical member 40 on the upper surface thereof.

Here, the grooves 24 of the light guide plate 20 may have a triangular, quadrangular, or trapezoidal cross section.

In some cases, when the cross-sectional shape of the groove 24 of the light guide plate 20 is a trapezoid, the first side of the groove among the first and second side facing each other is perpendicular to the bottom surface of the groove, The side surface can be inclined with respect to the bottom surface of the groove.

When the sectional shape of the grooves 24 of the light guide plate 20 is trapezoidal, the first and second side surfaces facing each other are inclined with respect to the bottom surface of the groove, and the inclination angle between the first side surface and the bottom surface is May be smaller than the inclination angle between the second side surface of the second side surface and the bottom surface.

In some cases, when the cross-sectional shape of the grooves 24 of the light guide plate 20 is triangular, the angle between the first and second opposite sides may be about 30-120 degrees.

The ratio of the height of the grooves 24 of the light guide plate 20 to the total thickness of the light guide plate 20 may be about 0.3-0.7: 1.

The light guide plate 20 may be formed of a material such as acrylic resin such as PMMA (Polymethylmethacrylate), polyethylene terephthalate (PET), cyclic olefin copolymers (COC), polyethylene naphthalate (PEN), polycarbonate, polystyrene, styrene) resin.

Next, the light guide plate 20 may have a stopper coupling part 26 formed thereunder.

Here, the stopper coupling portion 26 may be disposed on the lower surface of the light guide plate 20 adjacent to the groove 24 of the light guide plate 20.

The reason for this is that in order to facilitate engagement with the engaging member 72 which is in contact with the stopper 70 disposed in the groove 24 by disposing the stopper engaging portion 26 near the groove 24 of the light guide plate 20 to be.

The stopper coupling portion 26 may be disposed between the light sources 52 of the light source module 50 in correspondence with each other.

This is because the arm portion may appear between the light sources. If the stopper coupling portion 26 is disposed in the region where the arm portion appears, the light generated in the light source is refracted by the stopper coupling portion 26, It is because.

Therefore, the stopper coupling portion 26 that is in contact with the light guide plate 20 may be a projection projecting from the lower portion of the light guide plate 20, or a hollowness formed in the lower portion of the light guide plate 20.

The stopper coupling portion 26 may have a planar shape of at least one of a circle, hemisphere, triangle, quadrangle, and polygon.

Next, the stopper coupling part 26 may be integrally formed with the same material as the light guide plate 20, but may be formed of another material depending on the case.

Here, the stopper coupling part 26 may be formed of a material such as polymethylmethacrylate (PMMA), polyethylene terephthalate (PET), cyclic olefin copolymers (COC), polyethylene naphthalate (PEN), polycarbonate, polystyrene (PS), and mathlacylate styrene . ≪ / RTI >

Next, the light source module 50 may be disposed in the groove 24 of the light guide plate 20.

The light source module 50 may include a substrate 54 and at least one light source 52 disposed on the substrate 54. The substrate 54 and the light source 52 are both disposed on the light guide plate 20, Or may be disposed within the groove 24.

The substrate 54 may be disposed outside the groove 24 of the light guide plate 20 and the light source 52 may be disposed inside the groove 24 of the light guide plate 20 as occasion demands.

The substrate 54 may have an electrode pattern for electrical connection to the light source 52 and may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon (Printed Circuit Board) substrate, or may be formed in a film form.

In addition, the substrate 54 can be selectively used as a single layer PCB, a multilayer PCB, a ceramic substrate, a metal core PCB, or the like.

Also, at least one light source 52 may be disposed on the substrate 54, and the light source 52 may be a side view type light emitting diode.

In some cases, the light source 52 may be a top view type light emitting diode.

As described above, the light source 52 may be a light emitting diode (LED) chip, the light emitting diode chip may be a blue LED chip or an ultraviolet LED chip, or a red LED chip, a green LED chip, a blue LED chip, green LED chips, and white LED chips.

Here, the white LED may be realized by combining a yellow phosphor on a blue LED or using a red phosphor and a green phosphor on a blue LED at the same time, and a yellow phosphorescent phosphor (Yellow phosphor), Red phosphor (Phosphor) and Green phosphor (Phosphor).

The reflector 30 may be disposed on the lower surface of the light guide plate 20.

That is, the reflector 30 may be disposed between the light guide plate 20 and the bottom chassis 10, and may extend from the lower surface to the side surface of the light guide plate 20.

Here, the reflector 30 is not formed under the substrate 54 of the light source module 50, but may be formed under the substrate 54 of the light source module 50, as the case may be.

The reflector 30 may be formed on at least one of the side surface of the groove 24 of the light guide plate 20 and the bottom surface of the groove 24.

Herein, the reflector 30 may include at least one of a metal or a metal oxide and may have a high reflectance such as aluminum (Al), silver (Ag), gold (Au), or titanium dioxide (TiO ₂ ) The branch may comprise a metal or a metal oxide.

Next, the optical member 40 may be disposed on the upper surface of the light guide plate 20.

Here, the optical member 40 is for diffusing the light emitted through the light guide plate 20, and may be formed with an uneven pattern on the upper surface to increase the diffusion effect.

In addition, the optical member 40 may be formed in a plurality of layers, and the concavo-convex pattern may be on the surface of the uppermost layer or any one layer.

The concavo-convex pattern may have a strip shape arranged along the light source module 50.

At this time, the concavo-convex pattern has protrusions on the surface of the optical member 40, and the protrusions consist of a first surface and a second surface facing each other, and an angle between the first surface and the second surface may be an obtuse angle or an acute angle.

Optionally, the optical member 40 is made of at least one sheet, and may optionally include a diffusion sheet, a prism sheet, a brightness enhancement sheet, and the like.

Here, the diffusion sheet diffuses the light emitted from the light source, and the prism sheet guides the diffused light to the light emitting area, and the brightness diffusion sheet strengthens the brightness.

The stopper 70 may be disposed between the light source module 50 and the light guide plate 20 to fix the light source module 50.

Here, the stopper 70 may be disposed in the groove 24 of the light guide plate 20 and may be in contact with at least one of the side surface of the groove 24, the bottom surface of the groove 24, and the light source module 50.

The stopper 70 is disposed in the groove 24 of the light guide plate 20 and has a first gap from the side surface of the groove 24 and a second gap from the bottom surface of the groove 24, 50). ≪ / RTI >

The distance between the side surface of the groove 24 and the stopper 70 is greater than the distance between the bottom surface of the groove 24 and the stopper 70 and the distance between the light source module 50 and the stopper 70, The distance between the light source module 50 and the stopper 70 may be smaller than the distance between the side surface of the groove 24 and the stopper 70 and the distance between the bottom surface of the groove 24 and the stopper 70.

The stopper 70 may be a polymer resin which is variable depending on the shape of the groove 24 of the light guide plate 20 and can be injection molded.

For example, the stopper 70 may be formed of an unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, n-butyl methacrylate isobutyl methacrylate, acrylic acid, methacrylic acid, hydroxyl ethyl methacrylate, hydroxyl propyl methacrylate, hydroxyl ethyl (meth) acrylate, may be at least one of acrylate, acrylamide, ethyl acrylamide, isobutyl acrylamide, and isobutyl acrylamide.

The stopper 70 is disposed in the groove 24 of the light guide plate 20 on which the light source module 50 is disposed to fix the light source module 50 and to fix the reflector 30 formed on the surface of the groove 24, Can also play a supporting role.

Next, the engaging member 72 which is in contact with the stopper 70 may include a body portion 72a and an engaging portion 72b.

The body portion 72a can support the stopper 70 and the substrate 54 of the light source module 50 and the engaging portion 72b can support the stopper 70 and the substrate 54 of the light source module 50, And can be coupled to the stopper coupling portion 26.

FIGS. 3 and 4 are views showing a stopper disposed in a groove of the light guide plate, FIG. 3 is a sectional view showing a stopper contacting the groove of the light guide plate, and FIG. 4 is a sectional view showing a stopper spaced apart from the groove of the light guide plate.

3, the stopper 70 is disposed in the groove 24 of the light guide plate 20 and includes at least one of the side surface of the groove 24, the bottom surface of the groove 24, and the light source module 50 As shown in FIG.

Here, when the reflector 30 is disposed on the side surface of the groove 24 and the bottom surface of the groove 24, the stopper 70 can be brought into contact with the reflector 30.

The stopper 70 may be spaced apart from the light source 52 of the light source module 50 and partially contact the upper surface and the side surface of the substrate 54 of the light source module 50.

Thus, the stopper 70 may be in contact with both the reflector 30 disposed in the groove 24 of the light guide plate 20 and the light source module 50, or may be in contact with only one of them.

If the reflector 30 is not provided in the groove 24 of the light guide plate 20, the stopper 70 may be both in contact with the side surface of the groove 24, the bottom surface of the groove 24 and the light source module 50 And may be contacted only to at least one of them.

The engaging member 72 in contact with the stopper 70 may include a body portion 72a and an engaging portion 72b. The body portion 72a includes a stopper 70 and a light source module 50 and the engaging portion 72b can be coupled to the stopper engaging portion 26 that protrudes from the body portion 72a and is in contact with the light guide plate 20. [

4, the stopper 70 is disposed in the groove 24 of the light guide plate 20, and has a first distance d1 from the side surface of the groove 24, and extends from the bottom surface of the groove 24 And may have a third spacing d3 from the substrate 54 of the light source module 50 and a fourth spacing d4 from the light source 52 of the light source module 50. [

The first distance d1 and the second distance d2 mean the distance between the reflector 30 and the stopper 70 when the reflector 30 is disposed in the groove 24 of the light guide plate 20. [

At this time, the first interval d1, the second interval d2, the third interval d3, and the fourth interval d4 may be equal to each other, or at least one of them may have another interval.

The first distance d1 between the side surface of the groove 24 and the stopper 70 may be greater than the second distance d2 between the bottom surface of the groove 24 and the stopper 70. [

This is because when the light guide plate 20 thermally expands the side surface of the groove 24 facing the stopper 70 is wider than the bottom surface of the groove 24 facing the stopper 70, Since the side surface can be increased more than the bottom surface of the groove 24.

The first distance d1 between the side surface of the groove 24 and the stopper 70 and the second distance d2 between the bottom surface of the groove 24 and the stopper 70 are equal to the distance d2 between the substrate 54 of the light source module 50 The third spacing d3 between the stoppers 70 and the fourth spacing d4 between the light source 52 of the light source module 50 and the stopper 70. [

The reason is that when the light guide plate 20 is thermally expanded, the side surface of the groove 24 and the bottom surface of the groove 24 can be extended.

Accordingly, the first spacing d1 may be greater than the second spacing d2, the third spacing d3, and the fourth spacing d4, and the third spacing d3 and the fourth spacing d4 may be smaller than the first spacing d1 and the second spacing d2 have.

Optionally, the third spacing d3 may be less than the fourth spacing d4.

This is because the light source 52 is vulnerable to an external impact and it is necessary to maintain a constant interval so as not to come into contact with the stopper 70 if possible.

The stopper 70 may be bonded to at least one of the light source module 50 and the light guide plate 20 by an adhesive.

The engaging member 72 in contact with the stopper 70 may include a body portion 72a and an engaging portion 72b. The body portion 72a includes a stopper 70 and a light source module 50 and the engaging portion 72b can be coupled to the stopper engaging portion 26 that protrudes from the body portion 72a and is in contact with the light guide plate 20. [

FIG. 5 is a structural cross-sectional view showing the engagement of the engagement member in contact with the stopper according to the first embodiment and the stopper engagement portion in contact with the light guide plate, FIG. 6A is a bottom perspective view showing the stopper engagement portion in FIG. And FIG. 6C is a bottom perspective view showing the coupling member and the stopper coupling portion of FIG. 5 are coupled.

5 and 6A, a stopper coupling part 26 for coupling with a coupling member 72 which is in contact with the stopper 70 may be formed at a lower portion of the light guide plate 20. [

The stopper coupling portion 26 may be a projection disposed adjacent to the groove of the light guide plate 20 and protruding from the lower surface of the light guide plate 20.

Here, the stopper coupling portion 26 may have a rectangular planar shape, and may have various planar shapes such as a circle, hemisphere, triangle, and polygon.

The stopper coupling part 26 may be an integral type made of the same material as the light guide plate 20, but may be of a separate type made of a material different from that of the light guide plate 20.

Then, the thickness t1 of the stopper coupling portion 26 may have the same thickness as the engagement member 72 that is in contact with the stopper 70. [

The side surface of the stopper coupling portion 26 and the side surface of the light guide plate 20 may be located on the same plane so as not to be offset from each other.

5 and 6B, the engaging member 72 is disposed at the lower portion of the stopper 70 and the engaging member 72 is engaged with the stopper engaging portion 26 which is in contact with the light guide plate 20 .

Here, the engaging member 72 which is in contact with the stopper 70 may include a body portion 72a and an engaging portion 72b.

The body portion 72a can support the stopper 70 and the substrate 54 of the light source module 50 and the engaging portion 72b can support the stopper 70 and the substrate 54 of the light source module 50, And can be coupled to the stopper coupling portion 26.

At this time, the engaging portion 72b may include a first segment 72b2 and a second segment 72b1.

The first segment 72b2 protrudes in the first direction from the body portion 72a and the second segment 72b1 is bent from the end of the first segment 72b2 in the second direction perpendicular to the first direction .

Here, the thickness of the first segment 72b2 may be equal to the thickness t2 of the body portion 72a and the thickness t3 of the second segment 72b1.

The width W1 of the first segment 72b2 may be equal to the width W2 of the second segment 72b1, and may have a different width depending on the case.

5 and 6C, the engaging portion 72b of the engaging member 72 may be at least one, and one engaging portion 72b may be one-to-one correspondent to the one stopper engaging portion 26 .

The first segment 72b2 of the engaging portion 72b is in contact with the first side of the stopper engaging portion 26 and the segment 72b1 of the engaging portion 72b is in contact with the second side of the stopper engaging portion 26, Lt; / RTI >

5, the side surface 54a of the substrate 54 of the light source module 50 may be in contact with or spaced apart from the side surface of the light guide plate 20. As shown in FIG.

FIG. 7 is a structural cross-sectional view showing the engagement of the engagement member in contact with the stopper according to the second embodiment and the stopper engagement portion in contact with the light guide plate, FIG. 8A is a bottom perspective view showing the engagement member in FIG. 7, Fig. 3 is a structural cross-sectional view showing a coupling member of Fig.

In the second embodiment, the stopper fastening portion 26 which is in contact with the light guide plate 20 is the same as that of the first embodiment, and thus a detailed description thereof will be omitted.

7 and 8A to 8B, the engaging member 72 is disposed at the lower portion of the stopper 70. The engaging member 72 includes a stopper engaging portion 26 that is in contact with the light guide plate 20, Can be combined.

Here, the engaging member 72 which is in contact with the stopper 70 may include a body portion 72a and an engaging portion 72b.

The body portion 72a can support the stopper 70 and the substrate 54 of the light source module 50 and the engaging portion 72b can support the stopper 70 and the substrate 54 of the light source module 50, And can be coupled to the stopper coupling portion 26.

At this time, the engaging portion 72b may include a first segment 72b2 and a second segment 72b1.

The first segment 72b2 protrudes in the first direction from the body portion 72a and the second segment 72b1 is bent from the end of the first segment 72b2 in the second direction perpendicular to the first direction .

Here, the thickness t31 of the first segment 72b2 is greater than the thickness t2 of the body portion 72a, and may be equal to the thickness t32 of the second segment 72b1.

The engaging portion 72b of the engaging member 72 may be at least one, and the engaging portion 72b may be coupled to the one stopper engaging portion 26 in a one-to-one correspondence.

The first segment 72b2 of the engaging portion 72b is in contact with the first side of the stopper engaging portion 26 and the segment 72b1 of the engaging portion 72b is in contact with the second side of the stopper engaging portion 26, Lt; / RTI >

7, the side surface 54a of the substrate 54 of the light source module 50 may be in contact with or spaced from the side surface of the stopper coupling portion 26 which is in contact with the light guide plate 20. [

The thickness t1 of the stopper coupling portion 26 is greater than the thickness t2 of the body portion 72a of the engagement member 72 which is in contact with the stopper 70 and the thickness t3 of the engagement portion 72b of the engagement member 72 As shown in FIG.

Fig. 9 is a structural cross-sectional view showing the engagement of the engagement member in contact with the stopper according to the third embodiment and the stopper engagement portion in contact with the light guide plate, Fig. 10A is a bottom perspective view showing the engagement member in Fig. 9, Fig. 3 is a structural cross-sectional view showing a coupling member of Fig.

In the third embodiment, since the stopper fastening portion 26 which is in contact with the light guide plate 20 is the same as that of the first embodiment, a detailed description thereof will be omitted.

9 and 10A to 10B, the engaging member 72 is disposed at the lower portion of the stopper 70. The engaging member 72 includes a stopper engaging portion 26 that is in contact with the light guide plate 20 Can be combined.

Here, the engaging member 72 which is in contact with the stopper 70 may include a body portion 72a and an engaging portion 72b.

The body portion 72a can support the stopper 70 and the substrate 54 of the light source module 50 and the engaging portion 72b can support the stopper 70 and the substrate 54 of the light source module 50, And can be coupled to the stopper coupling portion 26.

At this time, the engaging portion 72b may include a first segment 72b2 and a second segment 72b1.

The first segment 72b2 protrudes in the first direction from the body portion 72a and the second segment 72b1 is bent from the end of the first segment 72b2 in the second direction perpendicular to the first direction .

Here, the thickness t31 of the first segment 72b2 is thicker than the thickness t2 of the body portion 72a, and may be thicker than the thickness t32 of the second segment 72b1.

In some cases, the thickness t32 of the second segment 72b1 may be equal to the thickness t2 of the body portion 72a.

The engaging portion 72b of the engaging member 72 may be at least one, and the engaging portion 72b may be coupled to the one stopper engaging portion 26 in a one-to-one correspondence.

The first segment 72b2 of the engaging portion 72b is in contact with the first side of the stopper engaging portion 26 and the segment 72b1 of the engaging portion 72b is in contact with the second side of the stopper engaging portion 26, Lt; / RTI >

9, the side surface 54a of the substrate 54 of the light source module 50 may be in contact with or spaced from the side surface of the stopper coupling portion 26 which is in contact with the light guide plate 20. [

The thickness t1 of the stopper coupling portion 26 may have a thickness different from the thickness t2 of the body portion 72a and the thickness t3 of the engaging portion 72b which are in contact with the stopper 70. [

11A is a bottom perspective view showing a stopper fastening portion in contact with the light guide plate according to the fourth embodiment, FIG. 11B is a bottom perspective view showing a fastening member in contact with the stopper according to the embodiment of FIG. And a stopper fastening portion in contact with the light guide plate.

11A to 11C, the engaging member 72 is disposed at the lower portion of the stopper 70 and the engaging member 72 can be engaged with the stopper engaging portion 26 contacting the light guide plate 20 have.

Here, the engaging member 72 which is in contact with the stopper 70 may include a body portion 72a and an engaging portion 72b.

The body portion 72a can support the stopper 70 and the substrate 54 of the light source module 50 and the engaging portion 72b can support the stopper 70 and the substrate 54 of the light source module 50, And can be coupled to the stopper coupling portion 26.

At this time, the number of the engaging portions 72b is plural, and the two engaging portions 72b may be disposed and coupled between the stopper engaging portions 26 adjacent to each other.

That is, the engaging member 72 which is in contact with the stopper 70 according to the fourth embodiment has an arrow shape in which two engaging portions 72b are formed as a pair, and a pair of engaging portions 72b are formed on the light guide plate 20, And the stopper fastening portions 26 that are in contact with the stopper fastening portions 26.

The stopper fastening portions 26 that are in contact with the light guide plate 20 are formed such that one side edge region is inclined so that the pair of fastening portions 72b are easily inserted between the stopper fastening portions 26 contacting the light guide plate 20 .

FIG. 12A is a bottom perspective view showing a stopper fastening portion in contact with the light guide plate according to the fifth embodiment, FIG. 12B is a bottom perspective view showing a fastening member in contact with the stopper according to the embodiment of FIG. And a stopper fastening portion in contact with the light guide plate.

12A to 12C, the engaging member 72 is disposed at the lower portion of the stopper 70 and the engaging member 72 can be engaged with the stopper engaging portion 26 in contact with the light guide plate 20 have.

Here, the stopper coupling portion 26 that is in contact with the light guide plate 20 may be a hollowness 25 formed at a lower portion of the light guide plate 20 and having a predetermined height t5.

Here, the groove 25 may have a planar shape that is at least one of a circle, hemisphere, triangle, quadrangle, and polygon.

The engaging member 72 which is in contact with the stopper 70 may include a body portion 72a and a engaging portion 72b.

The body portion 72a can support the stopper 70 and the substrate 54 of the light source module 50 and the engaging portion 72b can support the stopper 70 and the substrate 54 of the light source module 50, And can be coupled to the stopper coupling portion 26.

At this time, the engaging portion 72b may include a first segment 72b2 and a second segment 72b1, and the first segment 72b2 may protrude from the body portion 72a.

And, the second segment 72b1 may extend from the end of the first segment 72b2 and have a larger area than the first segment 72b2.

The planar shape of the first and second segments 72b2 and 72b1 may be the same as the planar shape of the stopper coupling portion 26 of the light guide plate 20. [

13 is a plan view showing a region in which a stopper fastening portion in contact with the light guide plate according to the embodiment is disposed.

13, the stopper coupling portion 26, which is in contact with the light guide plate 20, is disposed adjacent to the light source module 50 disposed in the groove of the light guide plate 20 at a lower portion of the light guide plate 20 .

That is, the stopper coupling portion 26 can be disposed facing the substrate 54 of the light source module 50 disposed in the groove of the light guide plate 20. [

The stopper coupling part 26 may be disposed between the light sources 52 of the light source module 50 in correspondence with each other.

The reason why the stopper coupling portion 26 is disposed between the light sources 52 is that when the adjacent light sources 52 are spaced apart from each other by a predetermined distance, The area of the arm portion 26 appears.

13, when the stopper coupling portion 26 is formed on the lower surface of the light guide plate 20 between the light sources 52, the stopper coupling portion 26 having a protruding shape or a groove- So that it is possible to reduce the dark region appearing between the light sources 52. FIG.

As described above, in the embodiments, a stopper is formed between the light guide plate and the light source module, and the stopper is stably fixed to the light guide plate, thereby stabilizing the light source module and improving the reliability of the backlight unit.

14 is a view showing a display module having a backlight unit according to an embodiment.

As shown in FIG. 14, the display module 200 may include a display panel 90 and a backlight unit 100.

The display panel 90 includes a color filter substrate 91 and a TFT (Thin Film Transistor) substrate 92 bonded to each other to maintain a uniform cell gap, A layer (not shown) may be interposed.

The color filter substrate 91 includes a plurality of pixels composed of red (R), green (G), and blue (B) subpixels and generates an image corresponding to red, green, .

The pixels may be composed of red, green, and blue subpixels, but the red, green, blue, and white (W) subpixels constitute one pixel.

The TFT substrate 92 can switch a pixel electrode (not shown) as an element in which switching elements are formed.

For example, the common electrode (not shown) and the pixel electrode can change the arrangement of molecules in the liquid crystal layer according to a predetermined voltage applied from outside.

The liquid crystal layer is composed of a plurality of liquid crystal molecules, and the liquid crystal molecules change their arrangement in accordance with the voltage difference generated between the pixel electrode and the common electrode.

Thereby, the light provided from the backlight unit 100 can be incident on the color filter substrate 91 in accordance with the change in the molecular arrangement of the liquid crystal layer.

The upper polarizer 93 and the lower polarizer 94 may be disposed on the upper and lower sides of the display panel 90. More specifically, the upper polarizer 93 is disposed on the upper surface of the color filter substrate 91 And the lower polarizer 94 may be disposed on the lower surface of the TFT substrate 92.

Although not shown, a gate and a data driver for generating a driving signal for driving the display panel 90 may be provided on a side surface of the display panel 90.

As shown in FIG. 14, the display module 200 can be configured by closely attaching the backlight unit 100 to the display panel 90.

For example, the backlight unit 100 may be adhered and fixed to the lower surface of the display panel 90, more specifically, to the lower polarizer 94, and between the lower polarizer 94 and the backlight unit 100 An adhesive layer (not shown) may be formed.

By forming the backlight unit 100 in close contact with the display panel 90 as described above, the overall thickness of the display device can be reduced to improve the appearance and the additional structure for fixing the backlight unit 100 is removed The structure and manufacturing process of the display device can be simplified.

In addition, by removing the space between the backlight unit 100 and the display panel 90, it is possible to prevent a malfunction of the display device or deterioration of the image quality of the display image due to penetration of foreign matter into the space.

15 and 16 are views showing a display device according to an embodiment.

15, the display device 1 includes a display module 200, a front cover 300 and a back cover 350 surrounding the display module 200, And a driving unit cover 400 surrounding the driving unit 550 and the driving unit 550.

The front cover 300 may include a transparent front panel (not shown) that transmits light. The front panel protects the display module 200 at a predetermined interval, and the light emitted from the display module 200 So that an image displayed on the display module 200 is displayed from the outside.

Further, the front cover 300 can be made of a flat plate without the window 300a.

In this case, the front cover 300 can be made of a transparent material that transmits light, for example, an injection-molded plastic.

As such, if the front cover 300 is formed as a flat plate, the frame can be removed from the front cover 300.

The back cover 350 may be coupled with the front cover 300 to protect the display module 200.

The driving unit 550 may be disposed on one side of the back cover 350.

The driving unit 550 may include a driving control unit 550a, a main board 550b, and a power supply unit 550c.

The driving control unit 550a may be a timing controller and is a driving unit that adjusts the operation timing to each driver IC of the display module 200. The main board 550b includes a V-sync, an H- , G, and B resolution signals, and the power supply unit 550c may be a driver for applying power to the display module 200. FIG.

The driving unit 550 may be provided on the back cover 350 and may be surrounded by the driving unit cover 400.

The back cover 350 may include a plurality of holes to connect the display module 200 and the driving unit 550 and a stand 600 for supporting the display device 1.

16, the driving control unit 550a of the driving unit 550 is provided in the back cover 350, and the main board 550b and the power board 550c may be provided in the stand 600 have.

The driving unit cover 400 may cover only the driving unit 550 provided on the back cover 350.

Although the main board 550b and the power board 550c are separately formed in the embodiment, the main board 550b and the power board 550c may be formed as a single integrated board, but are not limited thereto.

The features, structures, effects and the like described in the 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 and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments 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.

20: light guide plate 26: stopper fastening part
30: Reflector 40: Optical member
50: light source module 70: stopper
72:

Claims (29)

A light guide plate having a groove;
A light source module disposed inside the groove, the light source module including a substrate and a light source arranged on the substrate;
A stopper disposed between the light source module and the light guide plate;
A stopper fastening portion disposed at a lower portion of the light guide plate; And
And an engaging member disposed at a lower portion of the stopper and connected to the stopper engaging portion,
Wherein the substrate and the stopper are disposed inside the groove. The display device according to claim 1, wherein the stopper coupling portion is disposed between the light sources of the light source module, and is disposed adjacent to the groove of the light guide plate. delete The light guide plate according to claim 1, wherein the stopper coupling portion is a projection projecting from a lower portion of the light guide plate or a hollowness formed in a lower portion of the light guide plate,
Wherein the stopper fastening portion has a planar shape that is at least one of a circular, hemispherical, triangular, square, or polygonal shape. delete The light guide plate according to claim 1, wherein the stopper fastening portion is a different material from the light guide plate,
The stopper fastening part may be formed of any one of PMMA (Polymethylmethacrylate), PET (polyethylene terephthalate), COC (Cyclic Olefin Copolymers), PEN (polyethylene naphthalate), PC (Polycarbonate), PS Display device. delete The display device according to claim 1, wherein a thickness of the stopper coupling portion is equal to or thicker than a thickness of the coupling member. delete The display device according to claim 1 or 2, wherein a side surface of the stopper fastening portion and a side surface of the light guide plate are located on the same plane. The connector according to claim 1 or 4,
A body portion for supporting the stopper and the light source module; And
And a coupling portion protruding from the body portion and coupled to the stopper coupling portion. 12. The apparatus according to claim 11,
A first segment protruding from the body portion in a first direction; And
And a second segment bent in a second direction perpendicular to the first direction from an end of the first segment. 13. The display device of claim 12, wherein the thickness of the first segment is greater than the thickness of the body portion, and is the same as the second segment. 13. The display device of claim 12, wherein the first segment is thicker than the body portion and the second segment, and the thickness of the second segment is the same as the body portion. 12. The display device according to claim 11, wherein the coupling portion is at least one, and the coupling portion is coupled to the one stopper coupling portion in a one-to-one correspondence. 12. The display device according to claim 11, wherein a plurality of the engaging portions are provided, and the two engaging portions are disposed and coupled between the adjacent stopper engaging portions. 12. The apparatus according to claim 11,
A first segment projecting from the body portion;
A second segment extending from an end of the first segment and having a larger area than the first segment,
Wherein the planar shape of the first and second segments is the same as the planar shape of the stopper engagement portion. delete The light source module according to claim 1, wherein the stopper is disposed in a groove of the light guide plate and is spaced apart from the groove and the light source module,
Wherein the stopper is spaced apart from a side of the groove by a first distance, spaced from a bottom surface of the groove by a second distance, and spaced from the light source module by a third distance,
Wherein the first interval is larger than the second and third intervals, and the third interval is smaller than the first and second intervals. delete The display device according to claim 1, wherein the stopper is in contact with at least one of a side surface of the groove, a bottom surface of the groove, and the light source module. delete delete delete The display device according to claim 1, further comprising a reflector disposed on at least one of a bottom surface of the groove and a side surface of the groove. delete delete delete delete

Images