KR20130058513A - Backlight unit and illumination system using the same - Google Patents

Abstract

PURPOSE: A backlight unit and a lighting system using the same are provided to offer a backlight unit having an air guide using a reflector with a partially inclined plane without a light guide plate, thereby producing light and an inexpensive backlight unit. CONSTITUTION: A reflector(300) is disposed on a bottom cover(500). An optical member is spaced apart from the reflector. At least one light source module(600) is disposed between the reflector and the optical member. A bracket(200) supports the light source module and includes a first and third protrusion portions. The reflection pattern of the reflector diffuses and reflects the light from the light source module. [Reference numerals] (AA) Air guide

Description

Backlight unit and illumination system using the same}

Embodiments relate to a backlight unit and a lighting system.

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

Unlike the self-luminous PDP, an LCD requires a separate backlight unit due to the absence of its own light emitting device.

The backlight unit used in LCD is classified into an edge type backlight unit and a direct type backlight unit according to the position of the light source. In the edge type, the light source is disposed on the left and right sides or the top and bottom sides of the LCD panel and the light guide plate is used. Since the light is evenly distributed on the front surface, the light is uniform and the panel thickness can be made ultra 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) was used as the light source of the existing edge type or direct type backlight unit.

However, since the CCFL-based backlight unit is always powered by the CCFL, a considerable amount of power is consumed, and the problems of environmental pollution due to the addition of about 70% color reproduction rate and mercury are pointed out as disadvantages.

As a substitute for solving the above problems, research on a backlight unit using an LED (Light Emitting Diode) has been actively conducted.

When the LED is used as a backlight unit, the LED array can be partially turned on and off, which can drastically reduce the power consumption. For the RGB LED, it exceeds 100% of the NTSC (National Television System Committee) color reproduction range specification. To provide consumers with more vivid picture quality.

1 is a cross-sectional view illustrating a general backlight unit.

As shown in FIG. 1, the backlight unit includes a light guide plate 2, a reflector 3, an optical member 4, and a light source module 5. It may include.

The backlight unit may further include a top cover 6, a bottom cover 7, and a panel guide module 8.

Here, the panel guide module 8 may support the display panel 9, and the top cover 6 may be connected to the panel guide module 8 and the bottom cover 7.

Subsequently, the light guide plate 2 may have a reflector 3 disposed on a lower surface thereof, and an optical member 4 disposed on an upper surface thereof.

Next, the light source module 5 includes a substrate 5b and a light source 5a arranged on the substrate 5b, which may be disposed on both sides of the light guide plate 2.

The backlight unit having such a structure can uniformly diffuse light using the light guide plate 2, but the light guide plate 2 not only makes the overall backlight unit heavy, but also causes a price increase.

Therefore, in the future, development of a backlight unit capable of uniformly diffusing light even without the light guide plate 2 will be required.

Embodiments provide a backlight unit having an air guide and a lighting system using the same using a reflector having some inclined surfaces without a light guide plate.

Embodiments include a bottom cover, a reflector disposed on the bottom cover, an optical member disposed at a predetermined interval from the reflector, and at least one disposed between the reflector and the optical member. And a bracket for supporting the light source module, wherein the bracket includes a first region adjacent to the optical member, a third region adjacent to the bottom cover, and a first region positioned between the first and third regions. A body portion including two regions and contacting the light source module, a first protrusion projecting from the first region of the body portion and contacting the optical member, and a second protrusion projecting from the second region of the body portion and contacting the reflector And a third protrusion protruding from the third region of the body portion and in contact with the bottom cover.

Here, the first, second and third protrusions may be parallel to each other, and the first, second and third protrusions may protrude in a direction perpendicular to the body portion.

Subsequently, the first, second and third protrusions may protrude in a direction parallel to the optical member, and the body portion may be disposed in a direction perpendicular to the optical member.

The first protrusion may protrude from the body portion to a first height, the second protrusion may protrude from the body portion to a second height, and the first height may be higher than the second height.

Here, the first height may be 1.1 to 5 times the second height.

Next, the first protrusion may protrude from the body portion to a first height, the third protrusion may protrude from the body portion to a third height, and the first height may be lower than the third height.

Here, the first height may be 0.1-0.9 times the third height.

Subsequently, the body portion may include a first surface contacting the light source module and a second surface facing the first surface, and the first, second, and third protrusions may protrude on the first surface of the body portion.

The first protrusion may include a third surface facing the light source module and a fourth surface facing the third surface, and a first fastening portion may be formed on the fourth surface of the first protrusion.

Here, the first fastening portion may be at least one protrusion that protrudes in a direction parallel to the body portion.

Next, the third surface of the first protrusion may include a flat surface and an inclined plane, the plane may be adjacent to the light source module, and the inclined surface may extend from an end of the plane to be inclined in the reflector direction.

Here, the end of the inclined surface may be located in the same collinear with the light source module.

Subsequently, the third surface of the first protrusion includes a plane, a first and a second inclined plane, the plane is adjacent to the light source module, the first inclined plane extends from the end of the plane and inclined in the reflector direction, and the second inclined plane is It may be inclined in the direction of the optical member from the end of the first inclined surface.

Here, the first angle between the extension line of the plane and the first inclined plane may be smaller than the second angle between the extension line of the plane and the second inclined plane.

In this case, a contact point where the first inclined surface and the second inclined surface meet may be positioned in the same collinear shape as the light source of the light source module.

The third protrusion may include a fifth surface facing the second protrusion and a sixth surface facing the fifth surface, and a second fastening portion may be formed on the sixth surface of the third protrusion.

Here, at least one second fastening part may be disposed in an edge region of the third protrusion, and may be inserted into a fastening groove of the bottom cover.

Subsequently, the third protrusion may be disposed away from the reflector by a predetermined distance.

Next, the light source module can be located between the first and second protrusions, the light source module can be in contact with the first and second protrusions, or the light source module is disposed at a first distance from the first protrusion, and the second It may be arranged at a second interval from the protrusion.

The reflector may include a first contact region contacting the second protrusion and a second contact region contacting the bottom cover, and a non-contact region may be located between the first contact region and the second contact region.

Here, the first contact region may be a plane, the second contact region may be an inclined surface, and the non-contact region may be at least one of a plane and an inclined surface.

The first contact area may be a specular reflection surface, the second contact area may be a diffuse reflection surface, and the non-contact area may be at least one of a regular reflection surface and a diffuse reflection surface.

Also, the area of the non-contact area may be larger than the area of the first contact area, and the area of the non-contact area may be smaller than the area of the second contact area.

Subsequently, the embodiment may further include a panel guide module coupled to the first protrusion of the bracket to support the display panel, and a top cover coupled to the bottom cover.

Embodiments can provide a light guide, a low manufacturing cost, and uniform luminance by forming a reflector for an air guide having a part of an inclined surface without using a light guide plate.

Therefore, the economics and reliability of the backlight unit can be improved.

1 is a cross-sectional view showing a typical backlight unit
2 is a cross-sectional view illustrating a backlight unit according to an embodiment.
3 is a cross-sectional view showing in detail the bracket of FIG.
4A to 4C are cross-sectional views comparing heights of the first, second and third protrusions of the bracket.
5A and 5B are cross-sectional views comparing the thicknesses of the first, second and third protrusions of the bracket.
6A and 6B are cross-sectional views comparing the spacing between the first, second and third protrusions of the bracket.
7 is a cross-sectional view showing a fastening member of the first protrusion of the bracket;
8 is a cross-sectional view showing the fastening of the first protrusion of the bracket and the panel guide module.
9 and 10 are cross-sectional views showing another embodiment of the first protrusion of the bracket.
11 is a cross-sectional view showing a fastening member of the third protrusion of the bracket;
12 is a cross-sectional view showing the engagement of the third protrusion and the bottom cover of the bracket.
13 is a cross-sectional view for explaining the positional relationship between the third protrusion of the bracket and the reflector.
14A to 14D are cross-sectional views illustrating an arrangement relationship between the light source module and the first and second protrusions of the bracket.
15 is a cross-sectional view showing areas of contact and non-contact surfaces of the reflector.
16 is a view illustrating a backlight unit in which an optical member is disposed;
17 illustrates a display module having a backlight unit according to an embodiment.
18 and 19 illustrate a display device according to an embodiment.

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

In the description of the embodiments, it is to be understood that each layer (film), region, pattern or structure is formed "on" or "under" a substrate, each layer The terms " on "and " under " encompass both being formed" directly "or" indirectly " In addition, the criteria for above or below each layer will be described with reference to the drawings.

The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. In addition, the size of each component does not necessarily reflect the actual size.

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

As shown in FIG. 2, the backlight unit includes a light source module 100, a bracket 200, a reflector 300, a top cover 400, and a bottom cover ( 500, an optical member 600, and a panel guide module 700.

Here, the bracket 200 may serve to support the light source module 100.

In addition, the bracket 200 may support the reflector 300 and the optical member 600.

That is, the bracket 200 may include a body part, first, second and third protrusions, the body part supporting the light source module 100, the first protrusion supporting the optical member 600, and The second protrusion may support the reflector 300 and the third protrusion may be fastened to the bottom cover 500.

In addition, the first protrusion of the bracket 200 may be formed of any one of a reflective coating film and a reflective coating material layer to reflect the light generated from the light source module 100 in the direction of the reflector 300.

Here, the lower surface of the first protrusion may face the reflector 300 and include a first area that is a first flat surface and a second area that is a first inclined plane.

The first plane may be adjacent to the light source module 100, and the first inclined plane may extend from an end of the first plane to be inclined toward the reflector 300.

Here, the end of the first inclined surface may be located on the same collinear with the light source module 100.

In addition, the lower surface of the first protrusion of the bracket 200 may further include a third region that is a second inclined surface.

Here, the second inclined surface may extend from the end of the first inclined surface of the second region and may be inclined in the direction of the upper surface of the first protrusion.

However, in some cases, the third region having the third inclined surface can be omitted.

As such, the reason why the first inclined surface is formed on the first protrusion of the bracket 200 is to prevent the hot spots from being generated by concentrating light around the end of the first protrusion.

In addition, in some cases, the reason why the second inclined surface is further formed on the first protrusion is to prevent the luminance from being lowered around the end of the first reflector 200 due to light blocking of the first inclined surface.

The first protrusion of the bracket 200 may include a metal or a metal oxide having high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ ), or the like.

In some cases, the first protrusion of the bracket 200 may be formed by depositing or coating a metal or a metal oxide on the polymer resin frame, or may be formed by printing a metal ink.

In addition, the first protrusion of the bracket 200 may be formed by bonding a reflective film or a reflective sheet on the polymer resin frame.

Subsequently, a serrated reflection pattern may be formed on a portion of the lower surface of the first protrusion of the bracket 200.

Here, the surface of the reflective pattern may be flat or curved.

The light source module 100 may be located between the first protrusion and the second protrusion of the bracket 200.

In some cases, the light source module 100 may be disposed to be spaced apart from the second protrusion while being in contact with the first protrusion, or may be disposed to be spaced apart from the first protrusion by being in contact with the second protrusion.

Alternatively, the light source module 100 may be disposed at a predetermined distance from the first protrusion and the second protrusion, or may be in contact with the first protrusion and the second protrusion simultaneously.

The light source module 100 may include a substrate 100b having an electrode pattern and at least one light source 100a disposed on the substrate 100b.

Here, the light source 100a of the light source module 100 may be a top view type light emitting diode.

In some cases, the light source 100a may be a side view type light emitting diode.

The substrate 100b may be a printed circuit board (PCB) substrate made of any one material selected from polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon (Si), or may be formed in a film form. have.

In addition, the substrate 100b may selectively use a single layer PCB, a multilayer PCB, a ceramic substrate, a metal core PCB, or the like.

Here, the substrate 100b may be formed of any one of a reflective coating film and a reflective coating material layer, and may reflect light generated by the light source 100a to the central region of the reflector 300.

Subsequently, the light source 100a may be a light emitting diode chip, and the light emitting diode chip may include a blue LED chip or an ultraviolet LED chip, or a red LED chip, a green LED chip, a blue LED chip, and yellow green. ) It may be configured in a package form combining at least one or more of the LED chip, the white LED chip.

The white LED may be realized by combining a yellow phosphor on a blue LED or by simultaneously using a red phosphor and a green phosphor on a blue LED, (Yellow phosphor), Red phosphor (Phosphor) and Green phosphor (Phosphor).

Next, the reflector 300 may have an inclined plane on a portion thereof, and may have a metal or metal oxide having high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ ), or the like. It may be configured to include.

The inclined surface of the reflector 300 may be a surface inclined at an angle with respect to the surface of the first protrusion of the bracket 200, and the inclined surface may be a concave surface, a convex surface, or a flat surface. It may be at least one of).

In some cases, the reflector 300 may include at least one inclined plane and at least one flat surface, and the plane of the reflector 300 may be a plane of the first protrusion of the bracket 200. It may be a parallel plane.

In addition, the reflector 300 includes at least two inclined surfaces having at least one inflection point, and the curvatures of the first and second inclined surfaces adjacent to the inflection point may be different from each other.

For example, the upper surface of the reflector 300 may include a fourth region that is a second flat surface and a fifth region that is a third inclined plane.

Here, the second plane may contact the second protrusion of the bracket 200, and the third inclined surface may extend from an end of the second plane to be inclined toward the lower surface of the reflector 300.

Next, the optical member 600 may be disposed at a predetermined interval from the reflector 300.

In addition, an air guide may be formed in the space between the reflector 300 and the optical member 600.

In some cases, the optical member 600 may include at least one sheet, and may selectively 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.

Subsequently, the panel guide module 700 may be engaged with the first protrusion of the bracket 200 to support the display panel 800.

In addition, the top cover 400 may include a fastening protrusion 410, and the fastening protrusion 410 of the top cover 400 may be fastened to the fastening groove 510 of the bottom cover 500.

3 is a cross-sectional view showing in detail the bracket of FIG.

As shown in FIG. 3, the bracket 200 may include a body portion 210, a first protrusion 220, a second protrusion 230, and a third protrusion 240.

Here, the body part 210 may be in contact with the light source module 100.

That is, the body portion 210 may include a first surface 210a contacting the light source module 100 and a second surface 210b facing the first surface 210a. First, second, and third protrusions 220, 230, and 240 may protrude from the first surface 210a.

For example, the body part 210 may include a first area adjacent to the optical member 600, a third area adjacent to the bottom cover 500, and a second area located between the first and third areas. The first protrusion 220 may protrude from the first region of the body portion 210 to contact the optical member 600, and the second protrusion 230 may protrude from the second region of the body portion 210. In contact with the reflector 300, the third protrusion 240 may protrude from the third region of the body portion 210 to be in contact with the bottom cover 500.

Here, the first, second, and third protrusions 220, 230, and 240 may be parallel to each other.

In addition, the first, second, and third protrusions 220, 230, and 240 may protrude in a direction perpendicular to the body portion 210.

Subsequently, the first, second, and third protrusions 220, 230, and 240 protrude in a direction parallel to the optical member 600, and the body part 210 is in a direction perpendicular to the optical member 600. Can be deployed.

In addition, the first protrusion 220 protrudes from the body portion 210 to the first height h1, the second protrusion 230 protrudes from the body portion 210 to the second height h2, and the first height h1 represents the first height h1. 2 height can be higher than h2.

Here, the first height h1 may be 1.1 to 5 times the second height h2.

As such, the height of the first protrusion 220 is higher than the height of the second protrusion 230 because the first protrusion 220 needs a larger area than the second protrusion 230.

That is, the second protrusion 230 needs only an area for supporting the reflector 300, but the first protrusion 220 has not only an area for supporting the optical member 600 but also a fastening member for fastening with the panel guide module. This is because the area to be arranged is also required.

Next, the first protrusion 220 protrudes from the body portion 210 to the first height h1, the third protrusion 240 protrudes from the body portion 210 to the third height h3, and the first height h1 is the first height h1. 3 height can be lower than h3.

Here, the first height h1 may be 0.1 to 0.9 times the third height h3.

As such, the reason why the height of the third protrusion 240 is higher than the height of the first protrusion 220 is to fasten the bracket 200 to the bottom cover 500 of FIG. 2.

That is, the third protrusion 240 requires a large area in which a plurality of fastening members are to be formed to stably fasten to the bottom cover 500 of FIG. 2.

In addition, the first protrusion 220 may include a third surface 220a facing the light source module 100 and a fourth surface 220b facing the third surface 220a. The first fastening part 222 may be formed on the fourth surface 220b.

Here, the first fastening part 222 may be at least one protrusion which protrudes in a direction parallel to the body part 210.

Subsequently, the third protrusion 240 may include a fifth surface 240a facing the second protrusion 230 and a sixth surface 240b facing the fifth surface 240a. The second fastening part 242 may be formed on the sixth surface 240b of the.

Here, at least one second fastening part 242 is disposed in the edge region of the third protrusion 240, and may be inserted into the fastening groove of the bottom cover 500 of FIG. 2.

In this case, the second fastening part 242 may be a cramp of the tracer type.

In addition, the third protrusion 240 may be disposed away from the reflector 300 by a predetermined interval.

4A to 4C are cross-sectional views comparing heights of the first, second and third protrusions of the bracket.

As shown in FIGS. 4A-4C, the first protrusion 220 protrudes from the body portion 210 to a first height h1, and the second protrusion 230 extends from the body portion 210 to a second height h2. Protrudes, the third protrusion 240 may protrude from the body portion 210 to a third height h3.

4A illustrates an embodiment in which the heights of the first, second, and third protrusions 220, 230, and 240 are different from each other, and the height h3 of the third protrusion 240 is the height of the first, second, and third protrusions 220, 230. It is higher than the height h1, h2, the height h2 of the second protrusion 230 is lower than the height h1, h3 of the first, third protrusions 220, 240, the height h1 of the first protrusion 220 is It may be higher than the height h2 of the second protrusion 230 and lower than the height h3 of the third protrusion 240.

Here, the first height h1 may be 1.1 to 5 times the second height h2. The reason why the height h1 of the first protrusion 220 is higher than the height h2 of the second protrusion 230 is that the first protrusion 220 is This is because a larger area is required than the second protrusion 230.

That is, the second protrusion 230 needs only an area for supporting the reflector 300, but the first protrusion 220 has not only an area for supporting the optical member 600 but also a fastening member for fastening with the panel guide module. This is because the area to be arranged is also required.

In addition, the first height h1 may be 0.1 to 0.9 times the third height h3. The reason why the height h3 of the third protrusion 240 is higher than the height h1 of the first protrusion 220 may stably stabilize the bracket 200. This is for fastening to the bottom cover (500 of FIG. 2).

That is, the third protrusion 240 requires a large area in which a plurality of fastening members are to be formed to stably fasten to the bottom cover 500 of FIG. 2.

Next, FIG. 4B illustrates an embodiment in which the height h3 of the third protrusion 240 is different from the heights h1 and h2 of the first and second protrusions 220 and 230. Heights h1 and h2 of the second protrusions 220 and 230 may be higher, and height h2 of the second protrusions 230 and height h1 of the first protrusion 220 may be the same.

Next, FIG. 4C illustrates an embodiment in which the heights of the first, second, and third protrusions 220, 230, and 240 are the same, and the height h3 of the third protrusion 240, the height h2 of the second protrusion 230, and The height h1 of the first protrusion 220 may be the same.

As such, the heights of the first, second, and third protrusions 220, 230, and 240 of the bracket 200 may be variously implemented according to the manufacturing environment.

5A and 5B are cross-sectional views comparing the thicknesses of the first, second and third protrusions of the bracket.

First, as illustrated in FIG. 5A, the thickness t3 of the third protrusion 240, the thickness t2 of the second protrusion 230, and the thickness t1 of the first protrusion 220 may be the same.

In addition, the thickness of the body portion 210 of the bracket may be equal to the thickness t3 of the third protrusion 240, the thickness t2 of the second protrusion 230, and the thickness t1 of the first protrusion 220.

In some cases, the thickness of the body portion 210 of the bracket may be thicker than at least one of the thickness t3 of the third protrusion 240, the thickness t2 of the second protrusion 230, and the thickness t1 of the first protrusion 220. Can be.

The reason for this is that the body portion 210 must fix one side of the first, second, and third protrusions 220, 230, and 240, so that a certain thickness must be secured.

As illustrated in FIG. 5B, the thickness t2 of the second protrusion 230 may be thinner than the thickness t3 of the third protrusion 240 and the thickness t2 of the second protrusion 230.

Here, the ratio of the thickness t2 of the second protrusion 230 and the thickness t3 of the third protrusion 240 may be 0.3-0.9: 1.

In addition, the ratio of the thickness t2 of the second protrusion 230 and the thickness t1 of the first protrusion 220 may be 0.3-0.9: 1.

The reason for this is that in the case of the second protrusion 230, only a force for supporting the reflector 300 is required, but in the case of the first protrusion 220, the fastening member for fastening with the optical member 600 and the panel guide module is supported. Because strength is needed.

In addition, since the third protrusion 240 needs a force capable of supporting a plurality of fastening members in order to stably fasten to the bottom cover 500 of FIG. 2.

The thickness of the body portion 210 of the bracket may be equal to the thickness t3 of the third protrusion 240 and the thickness t1 of the first protrusion 220.

In some cases, the thickness of the body portion 210 of the bracket may be thicker than at least one of the thickness t3 of the third protrusion 240 and the thickness t1 of the first protrusion 220.

6A and 6B are cross-sectional views comparing intervals between first, second and third protrusions of the bracket.

As shown in FIGS. 6A and 6B, the first, second, and third protrusions 220, 230, and 240 protrude from the body portion 210, and the first protrusion 220 and the second protrusion 230 are formed. May be spaced apart by the first interval d1, and the second protrusion 230 and the third protrusion 240 may be spaced apart by the second interval d2.

Here, the first interval d1 and the second interval d2 may be the same as in FIG. 6A, or in some cases, may be different from each other, as in FIG. 6B.

For example, the first spacing d1 between the first protrusion 220 and the second protrusion 230 may be smaller than the second spacing d2 between the second protrusion 230 and the third protrusion 240.

As such, the distance between the first, second, and third protrusions 220, 230, and 240 of the bracket 200 may be variously implemented according to a manufacturing environment.

For example, in the case of using a reflector having a large inclination angle of the inclined surface or in the case of a large backlight unit, the second distance d2 between the second protrusion 230 and the third protrusion 240 may be equal to the first protrusion 220. It may be larger than the first gap d1 between the second protrusions 230.

7 is a cross-sectional view showing a fastening member of the first protrusion of the bracket.

As shown in FIG. 7, the first protrusion 220 includes a third surface 220a facing the light source module 100 and a fourth surface 220b facing the third surface 220a. The first fastening part 222 may be formed on the fourth surface 220b of the first protrusion 220.

Here, the first fastening part 222 may be at least one protrusion which protrudes in a direction parallel to the body part 210.

In this case, the protrusions adjacent to each other may have the same height, but in some cases, may have different heights.

8 is a cross-sectional view illustrating the fastening of the first protrusion of the bracket and the panel guide module.

As shown in FIG. 8, the first fastening part 222 of the first protrusion 220 may be fastened with the panel guide module 700 by a fastening screw 710.

Here, the panel guide module 700 may be formed with at least one fastening hole, the fastening screw 710 is inserted into the fastening hole formed in the panel guide module 700, the inserted fastening screw 710 is the It may be connected to the first fastening portion 222 formed on the first protrusion 220.

9 and 10 are cross-sectional views showing another embodiment of the first protrusion of the bracket.

First, as shown in FIG. 9, the lower surface of the first protrusion 220 of the bracket facing the reflector 300 of FIG. 2 may include a first region and a second region.

The first region of the first protrusion 220 may be located adjacent to the light source module 100, and the second region of the first protrusion 220 may be located far from the light source module 100.

Here, the first region of the first protrusion 220 is a first plane 225 parallel to the upper surface of the first protrusion 220, and the second region of the first protrusion 220 is the first plane 225. It may be a first inclined surface 226 extending from the end of the inclined toward the reflector (300 of FIG. 2).

The lower surface of the first protrusion 220 includes a first region having a first width and a second region having a second width, and the first and second widths may be different from each other.

For example, the second width of the second region may be greater than the first width of the first region.

As such, the area of the first inclined surface 226 may be larger than the area of the first plane 225.

In addition, the contact point P where the side surfaces of the first inclined surface 226 and the first protrusion 220 meet may be positioned in the same collinear shape as the light source 100a of the light source module 100.

For example, the contact point P may be located between the width W of the light source 100a.

Next, as another embodiment, as shown in FIG. 10, the first protrusion 220 of the bracket may include first, second, and third regions having a lower surface facing the reflector (300 of FIG. 2). Can be.

The first area of the first protrusion 220 is located adjacent to the light source module 100, the third area of the first protrusion 220 is located away from the light source module 100, and the first area of the first protrusion 220 is positioned. The second region may be located between the first region and the third region.

Here, the first region of the first protrusion 220 is a first plane 225 parallel to the upper surface of the first protrusion 220, and the second region of the first protrusion 220 is the first plane 225. The first inclined surface 226 extending from the end of the inclined toward the reflector 300, the third region of the first protrusion 220 is extended from the end of the first inclined surface 226, the upper portion of the first protrusion 220 The second inclined surface 227 may be inclined in the plane direction.

In this case, the inclined slopes of the first inclined surface 226 and the second inclined surface 227 may be different from each other.

For example, the inclination of the first inclined surface 226 may be smaller than the inclination of the second inclined surface 227.

That is, the first angle θ1 between the extension line of the first plane 225 and the first inclined plane 226 is greater than the second angle θ2 between the extension line of the first plane 225 and the second inclined plane 227. Can be smaller.

However, in some cases, the inclination of the first inclined surface 226 and the inclination of the second inclined surface 227 may be the same.

In addition, a contact point P where the first inclined surface 226 and the second inclined surface 227 meet may be positioned in the same collinear shape as the light source 100a of the light source module 100.

For example, the contact point P may be located between the width W of the light source 100a.

Next, the first protrusion 220 has a first end adjacent to the light source module 100 and a second end facing the first end, and thicknesses of the first end and the second end may be different from each other.

Here, the thickness of the first end adjacent to the light source module 100 may be thinner than the thickness of the second end.

For example, the first thickness between the upper surface of the first protrusion 220 and the first plane 225 of the lower surface of the first protrusion 220 may include the upper surface of the first protrusion 220 and the first protrusion ( 220 may be thinner than a second thickness between the ends of the first inclined surface 226 of the lower surface.

Here, the first thickness may be 0.1-0.9 times the second thickness.

The reason for this is to prevent light from being concentrated in the area around the second end of the first protrusion 220 to generate a hot spot.

In addition, the lower surface of the first protrusion 220 includes a first region having a first width, a second region having a second width, and a third region having a third width, wherein the first, second, and third regions The width can be different.

For example, the second width of the second region may be greater than at least one of the first width of the first region and the third width of the third region.

In some cases, the second width of the second region may be equal to the third width of the third region.

The third width of the third region may be smaller than the first width of the first region.

In some cases, the third width of the third region may be greater than the first width of the first region.

As such, the area of the first inclined surface 226 may be larger than the area of at least one of the first plane 225 and the second inclined surface 227.

The area of the second inclined surface 227 may be smaller than the area of at least one of the first plane 225 and the first inclined surface 226.

In some cases, the first inclined surface 226 of the first protrusion 220 may be a flat plane having a predetermined inclination angle, a concave curved surface having a predetermined curvature, or a convex curved surface having a predetermined curvature. .

Also, the second inclined surface 227 of the first protrusion 220 may be a flat plane having a predetermined inclination angle, a concave curved surface having a predetermined curvature, or a convex curved surface having a predetermined curvature.

In some cases, the second inclined surface 227 of the first protrusion 220 may have a mixed shape in which at least two of a concave curved surface, a convex curved surface, and a flat plane are mixed.

11 is a cross-sectional view showing a fastening member of the third protrusion of the bracket.

As shown in FIG. 11, the third protrusion 240 includes a fifth face 240a facing the second protrusion 230 and a sixth face 240b facing the fifth face 240a. The second fastening part 242 may be formed on the sixth surface 240b of the third protrusion 240.

Here, at least one second fastening part 242 is disposed in the edge region of the third protrusion 240, and may be inserted into the fastening groove of the bottom cover 500 of FIG. 2.

In this case, the second fastening part 242 may be a cramp of the tracer type.

12 is a cross-sectional view showing the engagement of the third protrusion and the bottom cover of the bracket.

As shown in FIG. 12, the second fastening part 242 of the third protrusion 240 may be inserted into the fastening groove 501 of the bottom cover 500.

Here, at least one fastening groove 501 may be formed in the bottom cover 500, and the second fastening portion 242 of the third protrusion 240 may be formed in the fastening groove 501 formed in the bottom cover 500. The inserted second fastening part 242 may connect the third protrusion 240 of the bracket and the bottom cover 500.

It is sectional drawing for demonstrating the positional relationship of the 3rd protrusion part of a bracket, and a reflector.

As shown in FIG. 13, the third protrusion 240 of the bracket may be spaced apart from the lower surface of the reflector 300 by a predetermined distance.

Here, the reflector 300 is one end is in contact with the second protrusion 230 to extend in the bottom cover (500 of FIG. 2) direction, it may be extended so as not to contact the third protrusion (240).

For example, the reflector 300 may have a flat contact surface in contact with the second protrusion 230, and a non-contact surface not in contact with the second protrusion 230 may be a partial inclined surface.

Here, the inclined surface of the reflector 300 may not contact the third protrusion 240.

Accordingly, the third gap d3 between the center area of the third protrusion 240 and the reflector 300 may be greater than the fourth gap d4 between the edge area of the third reflector 240 and the reflector 300.

14A to 14D are cross-sectional views illustrating an arrangement relationship between the light source module and the first and second protrusions of the bracket.

14A is a view showing the light source module 100 in contact with the first protrusion 220 and the second protrusion 230 at the same time, and FIG. 14B is spaced apart from the first protrusion 220 and the second protrusion 230 by a predetermined distance. FIG. 14C is a view illustrating a light source module 100 disposed in contact with the first protrusion 220 and a light source module 100 spaced apart from the second protrusion 230 by a predetermined distance. The light source module 100 is disposed at a predetermined distance from the first protrusion 220 and is in contact with the second protrusion 230.

As shown in FIG. 14A, the light source module 100 may be in contact with the first protrusion 220 and the second protrusion 230.

In this case, the light source module 100 is in contact with the first and second protrusions 220 and 230, thereby preventing hot spots and transmitting light to an area far from the light source module 100, as well as the overall thickness of the backlight unit. You can also reduce the

Subsequently, as shown in FIG. 14B, the light source module 100 may be spaced apart from the first protrusion 220 by a first distance d1 and spaced apart from the second protrusion 230 by a second distance d2.

Here, the first distance d1 and the second distance d2 may be the same as or different from each other.

For example, the first distance d1 may be smaller than the second distance d2.

As illustrated in FIG. 14C, the light source module 100 may contact the first protrusion 220 and may be spaced apart from the second protrusion 230 by a distance d2.

Here, the light source module 100 may be in contact with the first protrusion 220 to prevent hot spots and transmit light to a region far from the light source module 100.

Next, as shown in FIG. 14D, the light source module 100 may contact the second protrusion 230 and may be spaced apart from the first protrusion 220 by a distance d1.

15 is a cross-sectional view showing areas of contact and non-contact surfaces of the reflector.

As shown in FIG. 15, the reflector 300 includes a first contact region 305 in contact with the second protrusion 230 of the bracket and a second contact region 307 in contact with the bottom cover 500. can do.

In the reflector 300, a non-contact area 306 may be located between the first contact area 305 and the second contact area 307.

Here, the first contact region 305 may be a planar surface, and the second contact region 307 may be an inclined surface.

The non-contact region 306 may be at least one of a plane and an inclined surface.

In addition, the first contact region 305 may be a specular reflection surface, and the second contact region 307 may be a diffuse reflection surface.

The non-contact area 306 may be at least one of a specular reflection surface and a diffuse reflection surface.

In some cases, the first contact region 305 of the reflector 300 may be provided with a specular reflection sheet that specularly reflects light, and the non-contact region 306 and the second contact region 307 of the reflector 300 may emit light. At least one of the specularly reflecting sheet for specular reflection and the specularly reflecting sheet for specularly reflecting light may be formed.

The reason for forming the specular reflection sheet in the first contact region 305 of the reflector 300 is to provide uniform luminance by reflecting a lot of light to the central region of the reflector 300 having low luminance.

The reason for forming the diffuse reflection sheet in the second contact region 307 of the reflector 300 is that the luminance can be compensated by the diffuse reflection of light in the second contact region 307 of the reflector 300 having low luminance. to be.

Next, the area of the non-contact area 306 may be larger than the area of the first contact area 305.

In addition, the area of the non-contact area 306 may be larger than the area of the second contact area 307.

When the second contact region 307 is an inclined surface, the upper surface 500a of the bottom cover 500 contacting the reflector 300 may be an inclined surface.

Meanwhile, the reflector 300 may include a metal or a metal oxide having high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ ), and the like, and the reflector 300 The materials formed in the first and second contact regions 305 and 307 and the non-contact region 306 may be different from each other, and the surface roughness of the first and second contact regions 305 and 307 and the non-contact region 306 may be different from each other. May be different.

That is, the reflector 300 may be formed of the same material as the first and second contact regions 305 and 307 and the non-contact region 306, and may have different surface roughnesses.

Alternatively, the reflector 300 may have the first and second contact regions 305 and 307 and the non-contact region 306 formed of different materials and at the same time have different surface roughnesses.

The reflector 300 may be a reflective coating film made in the form of a film, or may be a reflective coating material layer on which a reflective material is deposited.

The reflector 300 may include at least one of a metal or a metal oxide, and for example, a metal having a high reflectance such as aluminum (Al), silver (Ag), gold (Ag), or titanium dioxide (TiO ₂ ). Or a metal oxide.

In this case, the reflector 300 may be formed by depositing or coating a metal or metal oxide on a polymer resin frame, which is a bottom plate, or by printing a metal ink.

Here, as a deposition method, a vacuum deposition method such as a thermal evaporation method, an evaporation method or a sputtering method may be used, and as a coating or printing method, a printing method, a gravure coating method, or a silk screen method may be used.

In addition, the reflector 300 may be manufactured in the form of a film or sheet, and may be formed by adhering on the polymer resin frame.

Here, the reflector 300 may be a structure in which a single layer having the same reflectance is formed on the entire polymer resin frame which is a bottom plate, and the reflector 300 is a structure in which a plurality of layers having different reflectances are formed on the entire polymer resin frame. It may be.

As such, the reason why the reflector 300 is formed of a plurality of layers having different reflectances is that when only reflecting layers having the same reflectance are formed, the light reflectance of the entire reflecting surface is not uniform, and thus the overall luminance of the backlight may be uneven. to be.

Therefore, by forming a reflective layer having a relatively high reflectance in the reflective surface area where the brightness of light is low or a reflective layer having a relatively low reflectance in the reflective surface area where the brightness of light is high, the overall luminance of the backlight can be uniformly corrected. Can be.

16 is a view illustrating a backlight unit in which an optical member is disposed.

As shown in FIG. 16, the optical member 600 may be disposed at a predetermined interval from the reflector 300.

In addition, an air guide may be formed in the space between the reflector 300 and the optical member 600.

Here, the optical member 600 may have an uneven pattern 620 on the upper surface.

The optical member 600 is to diffuse the light emitted from the light source module 100, and may form the uneven pattern 620 on the upper surface to increase the diffusion effect.

That is, the optical member 600 may be formed of several layers, and the uneven pattern 620 may be formed on the top layer or the surface of any one layer.

In addition, the uneven pattern 620 may have a stripe shape disposed along the light source module 100.

At this time, the concave-convex pattern 620 has a protrusion on the surface of the optical member 600, the protrusion is composed of a first surface and a second surface facing each other, the angle between the first surface and the second surface is an obtuse or acute angle Can be.

In some cases, the optical member 600 may include at least one sheet, and may selectively 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.

In addition, the reflector 300 may include at least one of a metal and a metal oxide. For example, the reflector 300 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 metal oxide.

In addition, the reflector 300 may be formed of any one of a reflective coating film and a reflective coating material layer, and may serve to reflect light generated from the light source module 100 in the direction of the optical member 600.

The reflector 300 may have a sawtooth-shaped reflective pattern formed on a surface facing the optical member 600, and the surface of the reflective pattern may be flat or curved.

The reason why the reflective pattern is formed on the surface of the reflector 300 is that light generated by the light source module 100 can be uniformly diffused and reflected.

As such, the embodiments may provide a reflector for an air guide having at least one inclined surface among flat and curved surfaces, thereby providing light weight, low manufacturing cost, and uniform luminance.

Therefore, the economics and reliability of the backlight unit can be improved.

In addition, the bracket, the reflector, and the display device including the light source module, the indicator device, and the lighting system described in the above embodiments may be implemented. For example, the lighting system may include a lamp and a street lamp.

Such a lighting system can be used as an illumination light for collecting light by focusing a plurality of LEDs. In particular, it can be used as an embedded light (down light) to be embedded in a ceiling or a wall of a building so that the opening side of the shade can be exposed. have.

17 illustrates a display module having a backlight unit according to an embodiment.

As shown in FIG. 17, the display module 20 may include a display panel 800 and a backlight unit 700.

The display panel 800 includes a color filter substrate 810 and a TFT (Thin Film Transistor) substrate 820 bonded to each other to maintain a uniform cell gap, A liquid crystal layer (not shown) may be interposed.

The upper polarizer 830 and the lower polarizer 840 may be disposed on the upper and lower sides of the display panel 800 and more specifically the upper polarizer 830 may be disposed on the upper surface of the color filter substrate 810 And the lower polarizer 840 may be disposed on the lower surface of the TFT substrate 820.

Although not shown, a gate and a data driver for generating a driving signal for driving the panel 800 may be provided on a side of the display panel 800.

18 and 19 illustrate a display device according to an embodiment.

Referring to FIG. 18, the display apparatus 1 includes a display module 20, a front cover 30 surrounding the display module 20, a back cover 35, and a driver 55 provided in the back cover 35. And a driving unit cover 40 surrounding the driving unit 55.

The front cover 30 may include a front panel (not shown) made of a transparent material transmitting light. The front panel may protect the display module 20 at regular intervals, and light emitted from the display module 20 So that an image displayed on the display module 20 is displayed from the outside.

The back cover 35 can be coupled with the front cover 30 to protect the display module 20.

A driving unit 55 may be disposed on one side of the back cover 35.

The driving unit 55 may include a driving control unit 55a, a main board 55b, and a power supply unit 55c.

The driving control unit 55a may be a timing controller and is a driving unit for adjusting the operation timing of each driver IC of the display module 20. The main board 55b may include a V-sync, an H- B resolution signal, and the power supply unit 55c is a driving unit for applying power to the display module 20. [

The driving part 55 may be provided on the back cover 35 and may be surrounded by the driving part cover 40.

The back cover 35 may include a plurality of holes to connect the display module 20 and the driving unit 55 and a stand 60 for supporting the display device 1.

On the other hand, as shown in FIG. 19, the driving controller 55a of the driving unit 55 may be provided in the back cover 35, and the main board 55b and the power board 55c may be provided in the stand 60. have.

The driving unit cover 40 may cover only the driving unit 55 provided on the back cover 35.

Although the main board 55b and the power board 55c are separately formed in the present embodiment, they may be formed as one integrated board, but are not limited thereto.

Still another embodiment may be implemented with the bracket, reflector, display device including a light source module, an indicator device, a lighting system described in the above embodiments, for example, the lighting system may include a lamp, a street lamp. .

Such a lighting system can be used as an illumination light for collecting light by focusing a plurality of LEDs. In particular, it can be used as an embedded light (down light) to be embedded in a ceiling or a wall of a building so that the opening side of the shade can be exposed. have.

Features, structures, effects, and the like described in the above 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 each embodiment may be combined or modified with respect to other embodiments by those 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.

100: light source module 200: bracket
300: reflector 210: body portion
220: first protrusion 230: second protrusion
240: third projection

Claims (30)

A bottom cover;
A reflector disposed on the bottom cover;
An optical member disposed at a predetermined interval from the reflector;
At least one light source module disposed between the reflector and the optical member; And,
It includes a bracket (bracket) for supporting the light source module,
The bracket
A body part including a first area adjacent to the optical member, a third area adjacent to the bottom cover, and a second area located between the first and third areas, the body part being in contact with the light source module;
A first protrusion protruding from the first region of the body portion and in contact with the optical member;
A second protrusion protruding from the second region of the body portion and in contact with the reflector;
And a third protrusion protruding from the third region of the body portion and in contact with the bottom cover. The backlight unit of claim 1, wherein the first, second, and third protrusions are parallel to each other. The backlight unit of claim 1, wherein the first, second, and third protrusions protrude in a direction perpendicular to the body part. The backlight unit of claim 1, wherein the first, second, and third protrusions protrude in a direction parallel to the optical member, and the body portion is disposed in a direction perpendicular to the optical member. The backlight of claim 1, wherein the first protrusion protrudes from the body portion to a first height, the second protrusion protrudes from the body portion to a second height, and the first height is higher than the second height of the backlight. unit. The backlight unit of claim 5, wherein the first height is 1.1 to 5 times the second height. The backlight of claim 1, wherein the first protrusion protrudes from the body portion to a first height, the third protrusion protrudes from the body portion to a third height, and the first height is lower than the third height of the backlight. unit. 8. The backlight unit of claim 7, wherein the first height is 0.1 to 0.9 times the third height. The body of claim 1, wherein the body portion includes a first surface in contact with the light source module and a second surface facing the first surface, and the first, second, and third protrusions are formed on the first surface of the body portion. The back light unit protrudes. The light emitting device of claim 1, wherein the first protrusion includes a third surface facing the light source module and a fourth surface facing the third surface, and a first fastening portion is formed on the fourth surface of the first protrusion. Backlight unit. The backlight unit of claim 10, wherein the first fastening part is at least one protrusion protruding in a direction parallel to the body part. 11. The method of claim 10, wherein the third face of the first protrusion comprises a flat surface and an inclined plane, the plane being adjacent to the light source module, the inclined surface extending from an end of the plane. A backlight unit inclined in the reflector direction. The backlight unit of claim 12, wherein an end of the inclined surface is positioned in the same collinear shape as the light source module. 11. The method of claim 10, wherein the third surface of the first protrusion comprises a plane, a first, a second inclined surface, the plane is adjacent to the light source module, the first inclined surface extending from the end of the plane The backlight unit is inclined toward the reflector, and the second inclined surface is inclined toward the optical member from the end of the first inclined surface. The backlight unit of claim 14, wherein a first angle between the extension line of the plane and the first inclined plane is smaller than a second angle between the extension line of the plane and the second inclined plane. The backlight unit of claim 14, wherein a contact point at which the first inclined surface and the second inclined surface meet is positioned at the same collinear line as the light source of the light source module. The third protrusion of claim 1, wherein the third protrusion includes a fifth face facing the second protrusion and a sixth face facing the fifth face, and a second fastening portion is formed on the sixth face of the third protrusion. Backlight unit. The backlight unit of claim 17, wherein at least one second fastening part is disposed in an edge region of the third protrusion, and is inserted into a fastening groove of the bottom cover. The backlight unit of claim 1, wherein the third protrusion is spaced apart from the reflector by a predetermined distance. The backlight unit of claim 1, wherein the light source module is positioned between the first and second protrusions. The backlight unit of claim 20, wherein the light source module contacts at least one of the first and second protrusions. The backlight unit of claim 20, wherein the light source module is disposed at a first interval from the first protrusion and is disposed at a second interval from the second protrusion. The backlight unit of claim 22, wherein the first interval is smaller than the second interval. The non-contact area of claim 1, wherein the reflector includes a first contact area in contact with the second protrusion and a second contact area in contact with the bottom cover, and a non-contact area between the first contact area and the second contact area. The backlight unit is located. The backlight unit of claim 24, wherein the first contact region comprises a plane, the second contact region comprises an inclined surface, and the non-contact region includes at least one of the plane and the inclined surface. 25. The backlight unit of claim 24, wherein the first contact area is a specular reflection surface, the second contact area is a diffuse reflection surface, and the non-contact area is at least one of the specular reflection surface and the diffuse reflection surface. The backlight unit of claim 24, wherein an area of the non-contact area is larger than an area of the first contact area. 28. The backlight unit of claim 27, wherein an area of the non-contact area is smaller than an area of the second contact area. The method of claim 1,
A panel guide module coupled to the first protrusion of the bracket to support the display panel;
And a top cover coupled to the bottom cover. 30. An illumination system comprising the backlight unit of any one of claims 1 to 29.

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