KR101948140B1 - backlight unit and illumination system using the same - Google Patents

Abstract

A backlight unit and an illumination system, comprising: a bottom cover; a reflector disposed on the bottom cover; and at least one light source module disposed in an edge region of the reflector, A second inclined surface disposed adjacent to the first inclined surface and having a first curvature, a second inclined surface disposed adjacent to the first inclined surface and having a second curvature, and a third inclined surface disposed adjacent to the third inclined surface, And a fourth inclined plane disposed adjacent to the third inclined plane and having a fourth curvature, wherein the first curvature of the first inclined plane is larger than the second, third, and fourth curvatures, and the first curvature of the third inclined plane 3 curvature may be smaller than the first, second, and fourth curvatures.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit and an illumination system using the same,

An embodiment relates to a backlight unit and an illumination system 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 2, a reflector 3, an optical member 4, a light source module 5, .

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

The panel guide module 8 can support the display panel 9 and the top cover 6 can be connected to the panel guide module 8 and the bottom cover 7.

Next, the light guide plate 2 has 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. The light source module 5 may be disposed on both sides of the light guide plate 2.

The backlight unit having such a structure can uniformly diffuse the light using the light guide plate 2, but the whole backlight unit is not only heavy because of the light guide plate 2, but also causes a rise in price.

Therefore, it will be necessary to develop a backlight unit capable of uniformly diffusing light even without the light guide plate 2 in the future.

An embodiment of the present invention is to provide a backlight unit having an air guide and a lighting system using the same, by using a reflector having some inclined surfaces without a light guide plate.

An embodiment includes a bottom cover, a reflector disposed on the bottom cover, and at least one light source module disposed in an edge region of the reflector, wherein the reflector is disposed adjacent to the light source module, A third inclined surface disposed adjacent to the second inclined surface and having a third curvature, and a second inclined surface disposed adjacent to the second inclined surface, the third inclined surface having a second curvature, And a fourth curvature having a fourth curvature, wherein the first curvature of the first tilted surface is larger than the second, third, and fourth curvatures, and the third curvature of the third tilted surface is a curvature of the first, Second, and fourth curvatures.

Here, the ratio of the first radius of curvature to the third radius of curvature may be 1:20 - 30.

The second curvature of the second inclined surface may be smaller than the fourth curvature.

Here, the ratio of the second radius of curvature to the fourth radius of curvature may be 1.1 - 3: 1.

Next, a first distance between the vertical lines connecting the opposite ends of the first inclined surface is a second distance between the vertical lines connecting the opposite ends of the second inclined surface, a third distance between the vertical lines connecting the opposite ends of the third inclined surface, 4 < / RTI > between the vertical lines connecting the opposite ends of the four slopes.

Here, the third distance may be greater than the first, second, and fourth distances, and the ratio of the first distance to the third distance may be 1: 5-7.

And, the second distance may be greater than the fourth distance, and the ratio of the second distance to the fourth distance may be 2 - 3: 1.

The embodiment further includes an optical member disposed at a predetermined interval from the reflector and a bracket for supporting the light source module. The bracket includes a first region adjacent to the optical member, A body portion contacting the light source module and including a second region located between the first region and the third region, the third region being adjacent to the first region, and the second region being located between the first region and the third region; A first projection projecting from the second region of the body portion and contacting the reflector and a third projection projecting from the third region of the body portion and contacting the bottom cover.

Here, the ratio of the distance between the second projection and the third projection to the distance between both ends of the body portion may be 1: 2-5.

The distance between both ends of the second projection may be smaller than the distance between both ends of the first projection. The ratio of the distance between both ends of the second projection to the distance between both ends of the first projection is 1: 1.1 - 5.

Then, the distance between the second projection and the third projection may be smaller than the distance between both ends of the first projection.

Then, the first, second, and third projections may be parallel to each other, and the first, second, and third projections project in a direction parallel to the optical member, and the body is arranged in a direction perpendicular to the optical member .

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

The first projection may protrude from the body portion to a first height, and the third projection may protrude from the body portion to a third height, wherein the first height may be lower than the third height.

Then, the third projection may be disposed at a certain distance from the reflector, and the light source module may be positioned between the first and second projections.

Next, the reflector includes a first contact area contacting the second projection and a second contact area contacting the bottom cover, and a non-contact area may be located between the first contact area and the second contact area.

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

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

Then, 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.

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

Therefore, the economical 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 the reflector of FIG. 2 in detail;
Fig. 4 is a cross-sectional view showing the position of the bracket of Fig. 2
FIG. 5 is a detailed view of the bracket of FIG. 2. FIG.
6A to 6C are cross-sectional views each showing a comparison of the heights of the first, second and third projections of the bracket
7A and 7B are cross-sectional views comparing the thicknesses of the first, second, and third protrusions of the bracket
Figs. 8A and 8B are cross-sectional views comparing the intervals between the first, second and third projections of the bracket
9 is a sectional view for explaining the positional relationship between the third projection of the bracket and the reflector
FIGS. 10A to 10D are cross-sectional views for explaining the arrangement relationship between the first and second projections of the light source module and the bracket;
11 is a cross-sectional view showing the contact surface of the reflector and the area of the non-
12 is a view showing a display module having a backlight unit according to an embodiment
13 and 14 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 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. Also, the size of each component does not entirely reflect the actual size.

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

2, the backlight unit includes a light source module 100, a bracket 200, a reflector 300, a top cover 400, a bottom cover (not shown) 500, an optical member 600, and a panel guide module 700.

Here, the reflector 300 may have an inclined plane in part, and may be formed of a metal or metal oxide having a high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ ) As shown in FIG.

The inclined surface of the reflector 300 may be inclined at an angle with respect to the surface of the first projection of the bracket 200 and the inclined surface may be a concave surface, a convex surface, a flat surface, ). ≪ / RTI >

Optionally, the reflector 300 may include at least one inclined plane and at least one flat surface, wherein the plane of the reflector 300 is parallel to the plane of the first projection of the bracket 200, It can be a parallel side.

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

For example, the reflector 300 may include first, second, third, and fourth inclined surfaces.

Here, the first inclined surface may be disposed adjacent to the light source module 100, and may have a first curvature, and the second inclined surface may be disposed adjacent to the first inclined surface, and may have a second curvature.

The third inclined surface may be disposed adjacent to the second inclined surface, may have a third curvature, and the fourth inclined surface may be disposed adjacent to the third inclined surface, and may have a fourth curvature.

At this time, the first curvature of the first inclined plane may be larger than the second, third, and fourth curvatures, and the third curvature of the third inclined plane may be smaller than the first, second, and fourth curvatures.

Further, the second curvature of the second inclined surface may be smaller than the fourth curvature.

Next, the bottom cover 500 may include a plurality of supports 520.

The supports 520 may be arranged side by side in one direction to support the reflector 300.

The support 520 may have an inclined surface in contact with the reflector 300. The slope area of the support 520 adjacent to the light source module 100 among the supports 520 adjacent to each other may be different from that of the light source module 100, May be smaller than the area of the inclined surface of the support 520 remote from the support 520.

If the inclined surface area of the supporter 520 farther from the light source module 100 is smaller than the inclined surface area of the supporter 520 adjacent to the light source module 100, Because.

Therefore, by making the area of the inclined surface of the supporter 520 farther from the light source module 100 larger than the inclined surface area of the supporter 520 adjacent to the light source module 100, deflection of the reflector 300 can be prevented.

In addition, the inclined surface of the support 520 may be at least one of a concave surface, a convex surface, and a flat surface.

Here, the inclined surface of the support 520 may vary depending on the shape of the contact surface of the reflector 300.

The height of the support 520 adjacent to the light source module 100 among the supports 520 adjacent to each other may be lower than the height of the support 520 far from the light source module 100.

This is because the oblique surface is formed on the reflector 300 disposed on the support 520, thereby providing a uniform overall brightness.

The supports 520 may be formed in various shapes, for example, a stripe shape having a predetermined length.

Here, the lengths of the adjacent supports 520 may be different from each other, or may be equal to each other in some cases.

In addition, the bottom cover 500 may further include a fastener 521 that can engage with the fastening member of the bracket 200.

Here, the fastener 521 may protrude upward from the bottom plate of the bottom cover 500, and the protrusion height of the fastener 521 may be lower than the protrusion height of the supporter 520.

The height of the fastener 521 may be higher than the protrusion height of the support 520 or may be equal to the protrusion height of the support 520 depending on the size of the fastening member of the bracket 200. [

Next, the adjacent supports 520 may be connected by a plurality of reinforcing ribs 530.

That is, the supports 520 adjacent to each other may be arranged in the first direction, and the reinforcing ribs 530 may be arranged in the second direction perpendicular to the first direction.

Here, the upper surface of the reinforcing rib 530 is an inclined surface, and the lower surface of the reinforcing rib 530 may be a flat surface.

The first end of the reinforcing rib 530 is in contact with the support 520 adjacent to the light source module 100 and the second end of the reinforcing rib 530 is in contact with the light source module 100 May contact the distal support 520.

Here, the height of the first end may be lower than the height of the second end.

The spacing between the reinforcing ribs 530 located in the area adjacent to the light source module 100 may be greater than the spacing between the reinforcing ribs 530 located far from the light source module 100.

The number of the reinforcing ribs 530 located in the area adjacent to the light source module 100 may be smaller than the number of the reinforcing ribs 530 located in the area far from the light source module 100.

This is because deflection phenomenon of the reflector 300 located in the central region can be prevented.

The supports 520 may be integral with the bottom cover 300 or may be separated from the bottom cover 500. [

For example, the bottom cover 300 and the support 520 may be integrally made of the same material, and in some cases, the bottom cover 300 may be made of a first material and the support 520 may be made of a second material And they may be manufactured in a separate type in which they are attached.

The bottom cover 300 and the support 520 may be made of a thermoelectric material such as a metal or the bottom cover 300 may be made of a thermoelectric material such as metal and the support 520 may be made of a heat- .

Meanwhile, the bracket 200 can support the light source module 100.

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

That is, the bracket 200 may include a body portion, first, second, and third projecting portions, the body portion supporting the light source module 100, the first projecting portion supporting the optical member 600, 2 protrusion can support the reflector 300, and the third protrusion can be fastened to the bottom cover 500. [

The first protrusion of the bracket 200 may be formed of one of a reflective coating film and a reflective coating material layer to reflect light generated from the light source module 100 toward the reflector 300.

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

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

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

The lower surface of the first protrusion of the bracket 200 may further include a third area that is a second inclined surface.

Here, the second inclined surface may extend from the first inclined surface end of the second region and be inclined toward the upper surface of the first protruded portion.

However, the third region having the third inclined plane may be omitted in some cases.

The reason for forming the first inclined surface on the first projecting portion of the bracket 200 is to prevent hot spots from being generated due to the light concentrated around the end of the first projecting portion.

In addition, the second inclined surface is further formed on the first projecting portion in order to prevent the luminance of the periphery of the first reflector 200 from deteriorating due to the light interception of the first inclined surface.

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

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 metal ink.

The first protrusion of the bracket 200 may be formed by adhering a reflective film or a reflective sheet on the polymer resin frame.

The first protrusion of the bracket 200 may be formed with a serrated reflection pattern on a part of the lower surface.

Here, the surface of the reflection pattern may be plane or curved.

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

In some cases, the light source module 100 may be disposed at a predetermined distance from the second protrusion while contacting the first protrusion, or may be disposed apart from the first protrusion at the same time as contacting the second protrusion.

Alternatively, the light source module 100 may be spaced apart from the first projection and the second projection, or may be simultaneously contacted with the first projection and the second projection.

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 PCB (Printed Circuit Board) substrate made of any one material selected from the group consisting of polyethylene terephthalate (PET), glass, polycarbonate (PC) and silicon (Si) have.

In addition, the substrate 100b may be 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 a reflective coating film and a layer of a reflective coating material, and may reflect the light generated by the light source 100a to the central region of the reflector 300. [

The light source 100a 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 may be a red LED chip, a green LED chip, a blue LED chip, ) LED chip, or a 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 optical member 600 may be disposed spaced apart from the reflector 300 at regular intervals.

An air guide may be formed in a space between the reflector 300 and the optical member 600.

Here, the optical member 600 may have a concave-convex pattern 620 on its upper surface.

The optical member 600 is for diffusing light emitted from the light source module 100 and may have a concave-convex pattern 620 formed on its upper surface to increase the diffusion effect.

That is, the optical member 600 may have a plurality of layers, and the concave-convex pattern 620 may have a top surface or a surface of any one layer.

The concavity and convexity pattern 620 may have a strip 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, and an angle between the first surface and the second surface is an obtuse angle or an acute angle .

Optionally, the optical member 600 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 panel guide module 700 is coupled to the first protrusion of the bracket 200 to support the display panel 800.

The top cover 400 includes a fastening protrusion, and the fastening protrusion of the top cover 400 can be fastened to the fastening groove of the bottom cover 500.

3 is a cross-sectional view showing the reflector of FIG. 2 in detail.

3, brackets 200 may be disposed on both sides of the reflector 300, and the light source module 100 may be disposed within the protrusions of the bracket 200. As shown in FIG.

Here, the reflector 300 may include first, second, third, and fourth regions, wherein the first region of the reflector 300 is disposed adjacent to the light source module 100, May be a first inclined surface.

The second area of the reflector 300 may be disposed adjacent to the first area and may be a second inclined surface having a second curvature R2.

Next, the third area of the reflector 300 may be disposed adjacent to the second area and may be a third inclined surface having a third curvature R3, and the fourth area of the reflector 300 is disposed adjacent to the third area , And a fourth inclined surface having a fourth curvature R4.

At this time, the first curvature R1 of the first inclined plane may be larger than the second curvature R2, the third curvature R3, and the fourth curvature R4.

The second curvature R2 of the second inclined surface is smaller than the first curvature R1 and the fourth curvature R4 and may be larger than the third curvature R3.

Next, the third curvature R3 of the third inclined plane may be smaller than the first curvature R1, the second curvature R2, and the fourth curvature R4.

Next, the fourth curvature R4 of the fourth inclined plane is smaller than the first curvature R1, and may be larger than the second curvature R2 and the third curvature R3.

In addition, the ratio of the radius of the first curvature R1 to the radius of the third curvature R3 may be about 1: 20-30.

The ratio of the radius of the second curvature R2 to the radius of the fourth curvature R4 may be about 1.1 - 3: 1.

Next, the first region of the second reflector 300 has a first distance D1 between vertical lines connecting both ends of the first inclined plane, and the second region of the second reflector 300 has both ends of the second inclined plane Lt; RTI ID = 0.0 > D2. ≪ / RTI >

The third region of the second reflector 300 has a third distance D3 between the vertical lines connecting both ends of the third inclined plane and the fourth region of the second reflector 300 has both ends of the fourth inclined plane Lt; RTI ID = 0.0 > D4. ≪ / RTI >

Here, the first distance D1 of the first area may be smaller than the second distance D2 of the second area, the third distance D3 of the third area, and the fourth distance D4 of the fourth area.

The second distance D2 of the second area may be larger than the first distance D1 of the first area and the fourth distance D4 of the fourth area, and may be smaller than the third distance D3 of the third area.

The third distance D3 of the third area may be greater than the first distance D1 of the first area, the second distance D2 of the second area, and the fourth distance D4 of the fourth area.

Next, the fourth distance D4 of the fourth region may be larger than the first distance D1 of the first region, and may be smaller than the second distance D2 of the second region and the third distance D3 of the third region.

Here, the ratio of the first distance D1 of the first area to the third distance D3 of the third area may be about 1: 5-7.

The ratio of the second distance D2 of the second area to the fourth distance D4 of the fourth area may be about 2 - 3: 1.

In addition, the first region of the second reflector 300 may be a regular reflection region regularly reflecting incident light.

The second region of the second reflector 300 may be a regular reflection region regularly reflecting the incident light, or a diffusely reflecting region that irregularly reflects incident light.

In some cases, the second region of the second reflector 300 may be a mixed region in which a regular reflection region regularly reflecting incident light and a diffusely reflecting region diffusely reflecting the incident light are mixed.

Here, when the second region of the second reflector 300 is a mixed region, the area of the regular reflection region may decrease as the regular reflection region in the mixed region is away from the light source module 100.

Next, the third and fourth regions of the second reflector 300 may be irregularly reflecting regions that irregularly reflect incident light.

Here, the light reflectance of the specular reflection region and the diffusive reflection region may be about 50 - 99.99%.

Meanwhile, the bracket 200 may include a body portion and first, second, and third protrusions protruding from the body portion.

Here, the light source module 100 may be positioned between the first protrusion and the second protrusion, and the third protrusion may be positioned adjacent to the second protrusion.

The body portion of the bracket 200 has a distance D6 between the horizontal lines connecting both ends of the body portion. The distance D5 between the second and third projections may be smaller than the distance D6 between both ends of the body portion.

That is, the ratio of the distance D5 between the second projection and the third projection to the distance D6 between both ends of the body may be about 1: 2-5.

The first projection may have a distance D7 between the vertical lines connecting the opposite ends of the first projection and the second projection may have a distance D8 between the vertical lines connecting the opposite ends of the second projection.

Here, the distance D8 between both ends of the second projection may be smaller than the distance D7 between both ends of the first projection.

That is, the ratio of the distance D8 between both ends of the second projection to the distance D7 between both ends of the first projection may be about 1: 1.1-5.

The distance D5 between the second projecting portion and the third projecting portion may be smaller than the distance D7 between both ends of the first projecting portion.

4 is a cross-sectional view showing the position of the bracket of FIG. 2;

4, the bracket 200 can support the light source module 100, the reflector 300, and the optical member 600. As shown in FIG.

That is, the bracket 200 may include a body portion, first, second, and third projecting portions, the body portion supporting the light source module 100, the first projecting portion supporting the optical member 600, 2 protrusion can support the reflector 300, and the third protrusion can be fastened to the bottom cover 500. [

The first protrusion of the bracket 200 may be formed of one of a reflective coating film and a reflective coating material layer to reflect light generated from the light source module 100 toward the reflector 300.

The bottom cover 500 may then include a plurality of supports 520 and may optionally further include fasteners 521 that can engage the fastening members of the bracket 200 .

Next, the reflector 300 may contact the second projection of the bracket 200 and the support 520 of the bottom cover 500.

The panel guide module 700 is coupled to the first protrusion of the bracket 200 to support the display panel 800.

The top cover 400 includes a fastening protrusion 410 and the fastening protrusion 410 of the top cover 400 can be fastened to the fastening groove 510 of the bottom cover 500.

The optical member 600 may be spaced apart from the reflector 300 at regular intervals. An air guide may be formed in the space between the reflector 300 and the optical member 600.

FIG. 5 is a detailed view of the bracket of FIG. 2. FIG.

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

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

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

For example, the body 210 includes a first region adjacent to the optical member 600, a third region adjacent to the bottom cover 500, and a second region positioned between the first and third regions The first protrusion 220 protrudes from the first area of the body 210 and contacts the optical member 600 while the second protrusion 230 protrudes from the second area of the body 210 The third protrusion 240 protrudes from the third area of the body 210 and can be contacted to the bottom cover 500.

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

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

The first, second, and third protrusions 220, 230, and 240 protrude in a direction parallel to the optical member 600, and the body 210 protrudes in a direction perpendicular to the optical member 600 .

The first protrusion 220 protrudes from the body 210 at a first height h1 and the second protrusion 230 protrudes from the body 210 at a second height h2. 2 < / RTI > height h2.

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

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 the 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 the panel guide module This is because an area to be disposed is also required.

The first protrusion 220 protrudes from the body 210 to a first height h1 and the third protrusion 240 protrudes from the body 210 to a third height h3. 3 < / RTI > height h3.

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

The reason why the height of the third protrusion 240 is higher than the height of the first protrusion 220 is that the bracket 200 is stably fastened to the bottom cover 500 of FIG.

That is, the third protrusion 240 needs a large area where a plurality of fastening members are to be formed to stably fasten the bottom cover 500 (FIG. 2).

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.

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

The third protrusion 240 includes a fifth surface 240a facing the second protrusion 230 and a sixth surface 240b facing the fifth surface 240a. The second fastening portion 242 may be formed on the sixth surface 240b of the second fastening portion 240. [

Here, at least one of the second fastening portions 242 is disposed in the edge region of the third projecting portion 240 and can be inserted into the fastening groove of the bottom cover 500 (FIG. 2).

At this time, the second fastening portion 242 may be a brace of a regulator type.

The third protrusions 240 may be spaced apart from the reflector 300 by a predetermined distance.

6A to 6C are cross-sectional views comparing the heights of the first, second and third projections of the bracket.

6A to 6C, the first protrusion 220 protrudes from the body 210 to a first height h1 and the second protrusion 230 protrudes from the body 210 to a second height h2 And the third protrusion 240 protrudes from the body 210 to a third height h3.

The height h3 of the third protrusion 240 is a height of the first and second protrusions 220 and 230. The height h3 of the third protrusion 240 is the height of the first protrusion 220, And the height h2 of the second protrusion 230 is lower than the heights h1 and h3 of the first and third protrusions 220 and 240. The height h1 of the first protrusion 220 is higher than the height h1 of the first protrusion 220, 2 protrusion 230 and may be lower than the height h3 of the third protrusion 240. [

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 This is because a larger area is required as compared with the second protrusion 230.

That is, the second projection 230 needs only an area for supporting the reflector 300, but the first projection 220 is not limited to the area for supporting the optical member (600 in FIG. 2) This is because an area in which the fastening member is disposed is also required.

The height h1 of the third protrusion 240 is higher than the height h1 of the first protrusion 220 because the first height h1 may be 0.1-0.9 times the third height h3. And to fasten to the bottom cover (500 in Fig. 2).

That is, the third protrusion 240 needs a large area where a plurality of fastening members are to be formed to stably fasten the bottom cover 500 (FIG. 2).

6B shows 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. The height h3 of the third protrusion 240 is a distance between the first and second protrusions 220 and 230, The height h2 of the second protrusion 230 and the height h1 of the first protrusion 220 may be the same as the height h1 and h2 of the second protrusions 220 and 230.

6C shows an example in which the heights of the first, second and third protrusions 220, 230 and 240 are equal to each other. The height h3 of the third protrusion 240, the height h2 of the second protrusion 230, The height h1 of the first protrusions 220 may be equal to each other.

As described above, the height of the first, second, and third protrusions 220, 230, and 240 of the bracket 200 can be variously changed according to the manufacturing environment.

7A and 7B are cross-sectional views comparing the thicknesses of the first, second, and third protrusions of the bracket.

7A, 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 equal to each other.

The thickness of the bracket body 210 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. [

The thickness of the bracket body 210 is greater 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, .

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

7B, 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. Further, as shown in Fig.

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

The ratio of the thickness t2 of the second protrusion 230 to 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 projection 230, only the force for supporting the reflector 300 is required. However, in the case of the first projection 220, since the optical member 600 and the coupling member I need strength.

Further, the third projection 240 needs a force capable of supporting a plurality of fastening members to stably fasten to the bottom cover (500 in Fig. 2).

The thickness of the bracket body 210 may be the same as the thickness t3 of the third protrusion 240 and the thickness t1 of the first protrusion 220. [

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. [

8A and 8B are cross-sectional views comparing the intervals between the first, second and third projections of the bracket.

The first, second, and third protrusions 220, 230, and 240 protrude from the body 210 and include a first protrusion 220 and a second protrusion 230, as shown in FIGS. 8A and 8B. The second protrusion 230 and the third protrusion 240 may be disposed apart from each other by a second distance d2.

Here, the first distance d1 and the second distance d2 may be equal to each other as shown in FIG. 8A, and may be different from each other as shown in FIG. 8B, as the case may be.

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

As described above, the interval between the first, second, and third protrusions 220, 230, and 240 of the bracket 200 can be variously implemented according to the manufacturing environment.

A second gap d2 between the second projection 230 and the third projection 240 is larger than a distance between the first projection 220 and the second projection 220. [ May be greater than the first spacing d1 between the second protrusions 230.

9 is a cross-sectional view for explaining the positional relationship between the third projection of the bracket and the reflector.

As shown in FIG. 9, 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 has one end thereof contacting the second protrusion 230 and extending in the direction of the bottom cover 500 (FIG. 2), but may extend so as not to contact the third protrusion 240.

For example, the reflector 300 may have a contact surface that is in contact with the second projection 230 and a non-contact surface that is not in contact with the second projection 230.

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

The third spacing d3 between the central region of the third protrusion 240 and the reflector 300 may be greater than the fourth spacing d4 between the edge region of the third reflector 240 and the reflector 300. [

10A to 10D are sectional views for explaining the arrangement relationship between the first and second projections of the light source module and the bracket;

10A is a view showing a light source module 100 which is in contact with the first protrusion 220 and the second protrusion 230 at the same time and FIG. 10B is a view showing the light source module 100 separated from the first protrusion 220 and the second protrusion 230 10C is a view showing a light source module 100 that is in contact with the first protrusion 220 and is spaced apart from the second protrusion 230 at a predetermined distance, and FIG. 10D is a view The light source module 100 is spaced apart from the first protrusions 220 and is in contact with the second protrusions 230. FIG.

10A, the light source module 100 may be in contact with the first protrusion 220 and the second protrusion 230. As shown in FIG.

Here, the light source module 100 can prevent hot spot by contacting the first and second protrusions 220 and 230, and can transmit light to a region far from the light source module 100, .

10B, the light source module 100 may be spaced apart from the first protrusion 220 by a first distance d1 and from the second protrusion 230 by a second distance d2.

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

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

10C, 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 can prevent hot spots by contacting the first protrusion 220, and can transmit light to a region far from the light source module 100.

Next, as shown in FIG. 10D, the light source module 100 may contact the second protrusion 230 and be spaced apart from the first protrusion 220 by a distance d1.

11 is a cross-sectional view showing the area of the contact surface of the reflector and the non-contact surface.

11, the reflector 300 includes a first contact area 305 that contacts the second projection 230 of the bracket, a second contact area 305 that contacts the support 520 of the bottom cover 500, (307).

The non-contact area 306 may be positioned between the first contact area 305 and the second contact area 307 of the reflector 300. [

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

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

Further, the first contact area 305 may be a regular reflection surface, and the second contact area 307 may be a diffusely reflective surface.

The non-contact area 306 may be at least one of a regular reflection surface and a diffusely reflective surface.

The first contact area 305 of the reflector 300 may be provided with a regular reflection sheet that regularly reflects light and the noncontact area 306 and the second contact area 307 of the reflector 300 may reflect light At least one of a regularly reflecting regular reflection sheet and a diffusely reflecting sheet diffusely reflecting light may be formed.

The reason why the regular reflection sheet is formed in the first contact area 305 of the reflector 300 is that it can provide a uniform luminance by reflecting a large amount of light to the central area of the reflector 300 having low luminance.

The reason why the diffusing sheet is formed in the second contact area 307 of the reflector 300 is that the brightness can be compensated by irregularly reflecting the light in the second contact area 307 of the reflector 300 having low brightness to be.

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

Further, the area of the non-contact area 306 may be larger than the area of the second contact area 307. [

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

The reflector 300 may include a metal or metal oxide having a high reflectance such as aluminum (Al), silver (Au), gold (Au), titanium dioxide (TiO ₂ ) The first and second contact regions 305 and 307 and the noncontact region 306 may have different materials and the first and second contact regions 305 and 307 and the noncontact region 306 may have different surface roughnesses May be different from each other.

That is, in the reflector 300, the first and second contact regions 305 and 307 and the non-contact region 306 are formed of the same material, and the surface roughness may be different from each other.

Alternatively, in the reflector 300, the first and second contact regions 305 and 307 and the non-contact region 306 may be formed of different materials, and the surface roughness may be different from each other.

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

Reflector 300 may include at least one of metal or metal oxide, e.g., aluminum (Al), silver (Ag), gold metal having a high reflectance such as silver (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 may be formed by printing metal ink.

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

Also, the reflector 300 may be formed in the form of a film or a 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 as the bottom plate, and the reflector 300 may have a structure in which a plurality of layers having different reflectances are formed on the entire polymer resin frame Lt; / RTI >

The reason why the reflector 300 is formed with a plurality of layers having different reflectances is that if the reflective layer having the same reflectance is formed only, the light reflectance of the entire reflective surface is not uniform and the entire brightness of the backlight can be uneven to be.

Therefore, a reflective layer having a relatively high reflectance is formed in the reflective surface area where the brightness of light is low, or a reflective layer having a relatively low reflectance is formed in the reflective surface area where the brightness of light is high, so that the entire brightness of the backlight is uniformly corrected .

Thus, by forming the reflector for the air guide having at least one of the planar surface and the curved surface, the embodiments can provide a light weight, low manufacturing cost, and uniform brightness.

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

Further, it can be embodied as a bottom cover, a bracket, a reflector, a display device including the light source module, an indicating device, and an illumination system described in the above embodiments, for example, the illumination system can include a lamp, a streetlight .

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.

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

As shown in FIG. 12, 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.

13 and 14 are views showing a display device according to an embodiment.

13, the display device 1 includes a display module 20, a front cover 30 and a back cover 35 surrounding the display module 20, a driving unit 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.

14, the driving control unit 55a of the driving unit 55 is 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.

Another embodiment may be implemented with a bracket, a reflector, a display device including a light source module, a pointing device, and a lighting system described in the above embodiments, for example, the lighting system may include a lamp, a streetlight .

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.

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.

100: Light source module 200: Bracket
300: Reflector 210: Body part
220: first protrusion 230: second protrusion
240: third protrusion

Claims (24)

A bottom cover;
A reflector disposed on the bottom cover; And,
And at least one light source module disposed in an edge region of the reflector,
The reflector includes:
A first inclined surface disposed adjacent to the light source module and having a first curvature;
A second inclined surface disposed adjacent to the first inclined surface and having a second curvature;
A third inclined surface disposed adjacent to the second inclined surface and having a third curvature; And,
A fourth inclined surface disposed adjacent to the third inclined surface and having a fourth curvature,
Wherein the first curvature of the first inclined surface is greater than the second, third, and fourth curvatures, the second curvature of the second inclined surface is less than the fourth curvature, and the third curvature of the third inclined surface is Wherein the first, second, and fourth curvatures are smaller than the first, second, and fourth curvatures. The method of claim 1, wherein the ratio of the first radius of curvature to the third radius of curvature is 1:20 - 30, the ratio of the second radius of curvature to the fourth radius of curvature is 1.1 - 3: 1,
A first distance between the vertical lines connecting the opposite ends of the first inclined surface is a second distance between the vertical lines connecting the opposite ends of the second inclined surface, a third distance between the vertical lines connecting the opposite ends of the third inclined surface, A fourth distance between vertical lines connecting both ends of the fourth inclined surface,
Wherein the second distance is greater than the fourth distance,
Wherein the third distance is greater than the first, second, and fourth distances. 3. The backlight unit of claim 2, wherein the ratio of the first distance to the third distance is 1: 5 to 7, and the ratio of the second distance to the fourth distance is 2: 3: 1. The method according to claim 1,
An optical member disposed at a predetermined interval from the reflector; And,
Further comprising a bracket for supporting the light source module,
The bracket
A body portion including a first region adjacent to the optical member, a third region adjacent to the bottom cover, and a second region located between the first and third regions, the body region contacting the light source module;
A first projection projecting from a first region of the body portion and contacting the optical member;
A second protrusion protruding from a second region of the body portion and contacting the reflector;
And a third projection projecting from a third region of the body portion and contacting the bottom cover,
The ratio of the distance between the second projection and the third projection to the distance between both ends of the body portion is 1: 2-5,
Wherein a ratio between a distance between both ends of the second projection and a distance between both ends of the first projection is 1: 1.1-5,
Wherein a distance between the second projection and the third projection is smaller than a distance between both ends of the first projection. The optical unit according to claim 4, wherein the first, second, and third projections project in a direction parallel to the optical member, the body portion is disposed in a direction perpendicular to the optical member,
Wherein the first protrusion protrudes from the body portion to a first height and the second protrusion protrudes from the body portion to a second height, the first height is higher than the second height,
The third protrusion protruding from the body portion to a third height, the first height being lower than the third height,
Wherein the light source module is positioned between the first and second projections,
Wherein the reflector includes a first contact area contacting the second projection and a second contact area contacting the bottom cover, the non-contact area being located between the first contact area and the second contact area,
Wherein the first contact region includes a plane, the second contact region includes an inclined plane, and the noncontact region includes at least one of the plane and the inclined plane. A display device comprising the backlight unit according to any one of claims 1 to 5. A lighting system comprising the backlight unit according to any one of claims 1 to 5. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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