KR101894352B1 - backlight unit and illumination system using the same - Google Patents

Abstract

A second reflector, and at least one light source module disposed between the first and second reflectors, wherein a lower surface of the first reflector is connected to a second reflector, a second reflector, And a second region facing the reflector, the first region being a first flat surface and the second region being a first inclined plane, wherein the first plane is adjacent to the light source module, And the end of the first inclined surface may be positioned in the same collinear shape as the light source module.

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,

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 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 chassis 6, a bottom chassis 7, and a panel guide module 8.

Here, the panel guide module 8 can support the display panel 9, and the top chassis 6 can be connected to the panel guide module 8 and the bottom chassis 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 first reflector, a second reflector, and at least one light source module disposed between the first and second reflectors, the lower surface of the first reflector facing the second reflector, A first plane being a flat surface and a second region being a first inclined plane, wherein the first plane is adjacent to the light source module, the first plane of inclination extending from the end of the first plane, And the end of the first inclined surface may be positioned in the same collinear shape as the light source module.

Here, the lower surface of the first reflector may further include a third area that is a second inclined surface, and the second inclined surface may extend from the first inclined surface end of the second area and be inclined toward the upper surface of the first reflector.

The first angle between the extension of the first plane and the first inclined plane may be smaller than the second angle between the extension of the first plane and the second inclined plane.

Then, the contact point at which the first inclined surface and the second inclined surface meet may be collinear with the light source of the light source module, and the contact may be located between the widths of the light source.

Next, the first thickness between the first reflector upper surface and the first reflector lower surface is smaller than the second thickness between the first reflector upper surface and the first inclined surface end of the first reflector lower surface It is possible.

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

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

At this time, the second inclined surface may be at least one of a concave curved surface, a convex curved surface, and a flat plane, or the second inclined surface may be a concave curved surface, a convex curved surface, or a flat plane.

The area of the first inclined plane may be larger than the area of the first plane, and the first inclined plane of the first reflector may be at least one of a concave curved surface, a convex curved surface, and a flat plane.

The light source modules may then be spaced apart from the second reflector by a first spacing and from the first reflector by a second spacing, wherein the second spacing may be less than the first spacing.

Next, the first plane of the first reflector may completely cover the light source module.

The upper surface of the second reflector faces a first reflector and includes a fourth region that is a second flat surface and a fifth region that is a third inclined plane, And the third inclined surface may extend from the end of the second plane and be inclined toward the lower surface of the second reflector.

Here, the area of the second plane of the second reflector may be wider than the area of the first plane of the first reflector, and the third bevel of the second reflector may be at least one of a concave curved surface, a convex curved surface, and a flat plane .

The upper surface of the second reflector further includes a sixth region adjacent to the fifth region and being at least one of a plane and an inclined plane, the plane of the sixth region being parallel to the second plane of the fourth region, The inclined surface of the sixth region may extend from the end of the third inclined surface of the fifth region and be inclined toward the first reflector.

The upper surface of the first reflector may be a plane parallel to the first plane of the lower surface of the first reflector, and the upper surface of the first reflector may include at least one supporting surface for supporting the optical member, And the upper surface of the first reflector may be positioned on different lines.

At this time, the thickness between the support surface and the first reflector upper surface may be thinner than the thickness between the upper surface of the first reflector and the lower surface of the first reflector.

Next, the backlight unit further includes a heat dissipating member for emitting heat of the light source module, wherein the heat dissipating member includes first and second side surfaces facing each other, wherein the first side surface of the heat dissipating member is in contact with the light source module and the first reflector And the second side surface of the heat radiating member may be formed with at least one heat radiating protrusion.

Here, the heat radiating member may be made of the same material as the first reflector, and the heat radiating member and the first reflector may be one body type.

Also, the heat radiating member may be made of a material different from that of the first reflector, and the heat radiating member and the first reflector may be of a seperation type.

The backlight unit further includes a bottom cover for supporting the heat dissipating member and the second reflector, wherein the bottom cover includes at least one first groove on which the heat dissipating member is mounted and at least one second groove on which the heat dissipating protrusion is seated can do.

The first plane of the first reflector may be at least one of a regular reflection area regularly reflecting light and a diffusely reflecting area diffusely reflecting light, wherein the first plane of the first reflector is a regular reflection area regularly reflecting light.

Further, the backlight unit may further include an optical member disposed at a predetermined interval from the second reflector, and an air guide may be formed in the space between the second reflector and the optical member.

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
Figs. 3A and 3B are views showing the first reflector of Fig. 2
Fig. 4 is a sectional view of the second embodiment showing the first reflector of Fig. 2
5A to 5C are cross-sectional views showing a first inclined plane of the first reflector
6A to 6J are cross-sectional views showing a second inclined surface of the first reflector
7A to 7D are sectional views for explaining the arrangement relationship between the light source module and the first and second reflectors
8A to 8C are cross-sectional views showing the area of the first region of the first reflector
9A and 9B are sectional views showing the positional relationship between the first region of the first reflector and the second reflector
10A to 10D are cross-sectional views showing the upper surface of the first reflector
Figs. 11A and 11B are cross-sectional views showing a heat radiation member of the backlight unit
12 is a sectional view showing the bottom cover of the backlight unit
13A to 13C are cross-sectional views showing a second reflector including a plurality of planes
14A to 14C are cross-sectional views showing a second reflector including a plurality of inclined surfaces
15 is a view showing a backlight unit in which an optical member is disposed
16 is a view showing a display module having a backlight unit according to an embodiment
17 and 18 are views showing a display device according to the 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.

As shown in FIG. 2, the backlight unit may include a light source module 100, a first reflector 200, and a second reflector 300.

Here, the light source module 100 may be disposed between the first reflector 200 and the second reflector 300 and adjacent to the first reflector 200.

In some cases, the light source module 100 may be spaced apart from the second reflector 300 at the same time that the light source module 100 contacts the first reflector 200, or may be disposed at a distance from the first reflector 300 200 at regular intervals.

Alternatively, the light source module 100 may be spaced apart from the first reflector 200 and the second reflector 300, or may be in contact with the first reflector 200 and the second reflector 300 at the same time .

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 second 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).

The first reflector 200 and the second reflector 300 are spaced apart from each other by a predetermined distance so as to have an air guide in an empty space between the first reflector 200 and the second reflector 300, have.

The first reflector 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 second reflector 300.

The lower surface of the first reflector 200 faces the second reflector 300 and has a first region that is a first flat surface 201 and a second region that is a first inclined plane 202, Region. ≪ / RTI >

The first plane 201 is adjacent to the light source module 100 and the first inclined plane 202 extends from the end of the first plane 201 and can be inclined toward the second reflector 300.

Here, the end of the first inclined surface 202 may be collinear with the light source module 100.

The lower surface of the first reflector 200 may further include a third region that is the second inclined surface 203.

Here, the second inclined surface 203 may extend from the end of the first inclined surface 202 of the second region and may be inclined toward the upper surface 204 of the first reflector 200.

However, in some cases, the third region having the third inclined plane 203 may be omitted.

The first reflector 200 may have a contact point P where the first inclined surface 202 and the second inclined surface 203 meet between the width W of the light source 100a of the light source module 100.

That is, the contact point P where the first inclined surface 202 and the second inclined surface 203 meet may face the light exit surface 101 of the light source 100a.

The reason why the first inclined surface is formed in the first reflector is to prevent hot spots from being generated due to the concentration of light around the ends of the first reflector 200. [

In some cases, the second inclined surface is further formed on the first reflector in order to prevent the luminance of the periphery of the first reflector 200 from being lowered due to the light interception of the first inclined surface.

The first reflector 200 may include a metal or metal oxide having a high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ )

In some cases, the first reflector 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 metallic ink.

Also, the first reflector 200 may be formed by adhering a reflective film or a reflective sheet on a polymer resin frame.

The first reflector 200 may have a sawtooth-shaped reflection pattern formed on a part of the lower surface thereof.

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

The second reflector 300 may have a partially inclined plane and may be a metal having a high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ ) And may include a metal oxide.

The inclined surface of the second reflector 300 may be aligned with at least one of the light source module 100 and the first reflector 200.

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

In some cases, the second reflector 300 may include at least one inclined plane and at least one flat surface, wherein the plane of the second reflector 300 is parallel to the plane of the first reflector 200 And may be a plane parallel to the plane.

Also, the second 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.

2, the upper surface of the second reflector 300 faces the first reflector 200, and a fourth region that is a second flat surface 301 and a third region that is a third oblique surface and a fifth area that is an inclined plane 302.

Here, the second plane 301 is adjacent to the light source module 100, the third inclined plane 302 is extended from the end of the second plane 301 and inclined toward the lower surface of the second reflector 300 have.

FIGS. 3A and 3B show a first embodiment showing the first reflector of FIG. 2. FIG.

As shown in FIGS. 3A and 3B, the first reflector 200 may include first, second, and third regions that face the second reflector 300.

The first region of the first reflector 200 is located adjacent to the light source module 100 and the third region of the first reflector 200 is located away from the light source module 100, 2 region may be located between the first region and the third region.

The first area of the first reflector 200 is a first plane 201 parallel to the upper surface of the first reflector 200 and the second area of the first reflector 200 is the first plane 201, And the third region of the first reflector 200 extends from the end of the first inclined surface 202 and extends from the first reflector 200 toward the second reflector 300. The first inclined surface 202 extends from the end of the first reflector 200, The second inclined surface 203 may be inclined in the direction of the upper surface of the second inclined surface 203. [

At this time, the slopes of the first slopes 201 and the second slopes 203 may be different from each other.

For example, the inclination of the first inclined surface 201 may be smaller than the inclination of the second inclined surface 203.

3A, the first angle? 1 between the extension line EL of the first plane 201 and the first inclined plane 202 is equal to the extension line EL of the first plane 201 and the second inclined plane 202. In other words, Lt; RTI ID = 0.0 > 2, < / RTI >

However, depending on the case, the inclination of the first inclined surface 201 and the inclination of the second inclined surface 203 may be equal to each other.

The contact point P at which the first inclined surface 202 and the second inclined surface 203 meet may be collinear with the light source 100a of the light source module 100. [

For example, the contact P may be positioned between the width W of the light source 100a, as shown in Fig.

The first reflector 200 has a first end adjacent to the light source module and a second end opposite to the first end. The 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 may be thinner than the thickness of the second end.

3A, the first thickness t1 between the upper surface of the first reflector 200 and the first surface 201 of the lower surface of the first reflector 200 is greater than the first thickness t1 between the upper surface of the first reflector 200 and the lower surface of the first reflector 200. [ And the second thickness t2 between the end of the first inclined surface 202 of the lower surface of the first reflector 200 and the second inclined surface 202. [

Here, the first thickness t1 may be 0.1 - 0.9 times the second thickness t2.

The reason is that light is concentrated in the area around the second end of the first reflector 200 to prevent hot spots from being generated.

In addition, the lower surface of the first reflector 200 includes a first region having a first width W1, a second region having a second width W2, and a third region having a third width W3, , And the third widths W1, W2, and W3 may be different from each other.

For example, as shown in FIG. 3A, the second width W2 of the second region may be greater than at least one of the first width W1 of the first region and the third width W3 of the third region.

Optionally, the second width W2 of the second region may be the same as the third width W3 of the third region.

The third width W3 of the third region may be smaller than the first width W1 of the first region.

In some cases, the third width W3 of the third region may be larger than the first width W1 of the first region, as shown in Fig. 3B.

As described above, the area of the first inclined surface 202 may be larger than the area of at least any one of the first plane 201 and the second inclined plane 203.

The area of the second inclined plane 203 may be smaller than the area of at least one of the first plane 201 and the first inclined plane 202.

Fig. 4 is a second embodiment showing the first reflector of Fig. 2. Fig.

As shown in FIG. 4, the first reflector 200 may include a first region and a second region, the lower surface facing the second reflector 300.

The first region of the first reflector 200 may be located adjacent to the light source module 100 and the second region of the first reflector 200 may be located away from the light source module 100.

The first area of the first reflector 200 is a first plane 201 parallel to the upper surface of the first reflector 200 and the second area of the first reflector 200 is the first plane 201, And the first inclined surface 202 may be inclined in the direction of the second reflector 300.

The lower surface of the first reflector 200 includes a first region having a first width W1 and a second region having a second width W2. The first and second widths W1 and W2 may be different from each other.

For example, as shown in Fig. 4, the second width W2 of the second region may be greater than the first width W1 of the first region.

As such, the area of the first inclined surface 202 may be larger than the area of the first plane 201. [

5A to 5C are cross-sectional views showing a first inclined plane of the first reflector.

As shown in FIG. 5A, the first inclined surface 202 of the first reflector 200 may be a flat surface having a predetermined inclination angle.

5B, the first inclined surface 202 of the first reflector 200 may be a concave curved surface having a predetermined curvature.

Further, as shown in Fig. 5C, the first inclined surface 202 of the first reflector 200 may be a convex curved surface having a predetermined curvature.

6A to 6J are sectional views showing a second inclined surface of the first reflector.

As shown in FIG. 6A, the second inclined surface 203 of the first reflector 200 may be a flat surface having a predetermined inclination angle.

6B, the second inclined surface 203 of the first reflector 200 may be a concave curved surface having a predetermined curvature.

Further, as shown in Fig. 6C, the second inclined surface 203 of the first reflector 200 may be a convex curved surface having a predetermined curvature.

Next, as shown in FIG. 6D, the second inclined surface 203 of the first reflector 200 may have a stepped shape having a plurality of grooves.

In some cases, as shown in Figs. 6E to 6J, the second inclined surface 203 of the first reflector 200 may be a mixed shape in which at least two of concave curved surfaces, convex curved surfaces, and flat flat surfaces are mixed.

6E, the second inclined surface 203 of the first reflector 200 may be a convex curved surface having a first curvature in a region 203b adjacent to the first inclined surface 202, 202 may be a concave curved surface having a second curvature.

Here, the first and second curvatures may be different from each other, and may be equal to each other in some cases.

6F, the second inclined surface 203 of the first reflector 200 may be a concave curved surface having a second curvature in a region 203b adjacent to the first inclined surface 202, An area 203a remote from the slope 202 may be a convex curved surface having a first curvature.

Here, the first and second curvatures may be different from each other, and may be equal to each other in some cases.

6G, the second inclined surface 203 of the first reflector 200 may be a concave curved surface having a predetermined curvature in a region 203b adjacent to the first inclined surface 202, The region 203a remote from the substrate 202 may be a flat plane.

6H, the second inclined surface 203 of the first reflector 200 may be a convex curved surface having a predetermined curvature in a region 203b adjacent to the first inclined surface 202, The region 203a remote from the substrate 202 may be a flat plane.

6I, the second inclined surface 203 of the first reflector 200 may be a flat surface of the region 203b adjacent to the first inclined surface 202, The distant region 203a may be a concave curved surface having a predetermined curvature.

6J, the second inclined surface 203 of the first reflector 200 may be a flat surface that is adjacent to the first inclined surface 202, The far area 203a may be a convex curved surface having a predetermined curvature.

7A to 7D are cross-sectional views for explaining the arrangement relationship between the light source module and the first and second reflectors.

7A is a view showing a light source module 100 which is in contact with the first reflector 200 and the second reflector 300 at the same time. FIG. 7B is a view showing the light source module 100 contacting the first reflector 200 and the second reflector 300 7C is a view illustrating a light source module 100 that is disposed apart from the first reflector 200 at a predetermined distance and contacts the second reflector 300. FIG. 7D is a view illustrating a light source module 100 that is spaced apart from the first reflector 200 and the second reflector 300 at regular intervals.

As shown in FIG. 7A, the light source module 100 may be in contact with the first reflector 200 and the second reflector 300.

Here, the light source module 100 can prevent hot spots by contacting the first and second reflectors 200 and 300, and can transmit light to a region far from the light source module 100, and the thickness of the entire backlight unit .

7B, the light source module 100 may be in contact with the first reflector 200 and may be spaced apart from the second reflector 300 by a distance d1.

Here, the light source module 100 can prevent hot spot by contacting the first reflector 200, and can transmit light to a region far from the light source module 100.

7C, the light source module 100 may contact the second reflector 300 and may be spaced apart from the first reflector 200 by a distance d2.

Next, as shown in FIG. 7D, the light source module 100 may be spaced apart from the first reflector 200 by a second distance d2, and may be separated from the second reflector 300 by a first distance d1.

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

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

8A to 8C are sectional views showing the area of the first region of the first reflector.

8A to 8C, the lower surface of the first reflector 200 is divided into a first region 201 as a first plane 201, a second region as a first inclined plane 202 and a second region as a second inclined plane 203 And a third region.

Here, the first plane 201 of the first reflector 200 may be positioned adjacent to the light source module 100 so as to be aligned.

8A, the first plane 201 of the first reflector 200 may have a first width W1. The first width W1 is a height h1 of the light source module 100 (from the lower surface of the substrate 100b to the light source 100, (I.e., the distance to the upper surface 101 of the upper surface 100a).

Therefore, the first plane 201 of the first reflector 200 can cover the light source module 100 completely.

8B, the first plane 201 of the first reflector 200 may have a first width W1. The first width W1 is a height h1 of the light source module 100 (the lower surface of the substrate 100b) To the upper surface 101 of the light source 100a).

That is, the boundary line between the first plane 201 of the first area and the first inclined plane 202 of the second area may be located on the same line as the upper surface 101 of the light source 100a.

Therefore, the first plane 201 of the first reflector 200 can cover the light source module 100 completely.

8C, the first plane 201 of the first reflector 200 may have a first width W1. The first width W1 is a height h1 of the light source module 100 (the lower surface of the substrate 100b) To the upper surface 101 of the light source 100a).

Accordingly, the first plane 201 of the first reflector 200 may partially cover the light source module 100.

The reason for designing the area of the first region of the first reflector in various ways is to prevent hot spots from being generated due to the concentration of light in the region around the end of the first reflector 200. [

9A and 9B are cross-sectional views showing the positional relationship between the first region of the first reflector and the second reflector.

9A and 9B, the upper surface of the second reflector 300 faces a first reflector 200, and a fourth region that is a second flat surface 301 and a third region that is a third inclined surface and an inclined plane (302).

Here, the second plane 301 is adjacent to the light source module 100, the third inclined plane 302 is extended from the end of the second plane 301 and inclined toward the lower surface of the second reflector 300 have.

The first plane 201 of the first reflector 200 may be disposed opposite to the second plane 301 of the second reflector 300 as shown in FIG.

Here, the width of the first plane 201 of the first reflector 200 may be smaller than the width W11 of the second plane 301 of the second reflector 300.

That is, the area of the second plane 301 of the second reflector 300 may be wider than the area of the first plane 201 of the first reflector 200.

9B, the width of the first plane 201 of the first reflector 200 may be the same as the width W11 of the second plane 301 of the second reflector 300. [

That is, the area of the second plane 301 of the second reflector 300 may be the same as the area of the first plane 201 of the first reflector 200.

The reason why the area of the fourth area of the second reflector 300 is designed in various ways is that the light is concentrated in the area around the end of the first reflector 200 to prevent hot spots from being generated to be.

10A to 10D are sectional views showing the upper surface of the first reflector.

10A, the upper surface 204 of the first reflector 200 may be a plane parallel to the first plane 201 (FIG. 2) of the lower surface of the first reflector 200. As shown in FIG.

Here, the upper surface 204 of the first reflector 200 may also serve as a supporting surface for supporting the optical member 600.

10B, the upper surface 204 of the first reflector 200 may include at least one support surface 204b for supporting the optical member 600. [

The upper surface 204 of the first reflector 200 includes the upper surface 204a that does not support the optical member 600 and the support surface 204b that supports the optical member 600, 204b may be located on a different line from the top surface 204a.

Here, the thickness t11 between the support surface 204b and the upper surface 204a may be thinner than the thickness t1 between the upper surface 204a and the first plane of the lower surface of the first reflector 200.

10C, the upper surface 204 of the first reflector 200 may include at least one support surface 204b for supporting the optical member 600. In addition, as shown in FIG.

The upper surface 204 of the first reflector 200 includes the upper surface 204a that does not support the optical member 600 and the support surface 204b that supports the optical member 600, 204b may be located on a different line from the top surface 204a.

Here, the thickness t11 between the support surface 204b and the upper surface 204a may be equal to the thickness t1 between the upper surface 204a and the first plane of the lower surface of the first reflector 200.

10D, the upper surface 204 of the first reflector 200 is provided with a plurality of support surfaces 204b, 204c for supporting a plurality of optical members 600a, 600b, 600c , And 204d.

That is, the upper surface 204 of the first reflector 200 includes an upper surface 204a that does not support the optical member 600 and a plurality of supporting surfaces that support the plurality of optical members 600a, 600b, 204b, 204c, 204d, wherein the support surfaces 204b, 204c, 204d may be located on different lines from the top surface 204a.

11A and 11B are cross-sectional views showing a heat dissipation member of the backlight unit.

As shown in FIGS. 11A and 11B, the backlight unit may further include a heat dissipating member 400 for emitting heat of the light source module 100.

The first side 400a of the heat dissipation member 400 is connected to the light source module 100 and the first reflector 200. The first side 400a of the heat dissipation member 400 includes a first side 400a and a second side 400b facing each other, And the second side surface 400b of the heat dissipating member 400 may be formed with at least one heat dissipating protrusion 402. [

11A, the heat dissipating member 400 may be made of a different material from the first reflector 200, and the heat dissipating member 400 and the first reflector 200 may be formed separately from each other, Lt; / RTI >

For example, the radiation member 400 may be a metal material, and the first reflector 200 may be a polymer resin.

11B, the heat dissipating member 400 and the first reflector 200 may be integrally formed with the first reflector 200, and the heat dissipating member 400 may be integrally formed with the first reflector 200. In this case, the heat dissipating member 400 may be made of the same material as the first reflector 200, one body type).

For example, the heat radiating member 400 and the first reflector 200 may be a metallic material capable of conducting heat.

The heat dissipation protrusions 402 of the heat dissipation member 400 may be stripe-shaped or dot-shaped, arranged side by side along the array direction of the light source modules 100.

12 is a sectional view showing the bottom cover of the backlight unit.

12, the backlight unit may further include a bottom cover 500 supporting the heat radiation member 400 and the second reflector 300.

The bottom cover 500 may include at least one first groove 502 on which the heat dissipating member 400 is mounted and at least one second groove 504 on which the heat dissipating protrusion 402 is mounted.

The heat dissipating member 400 is in contact with the bottom cover 500 through the first groove 502 and the heat dissipating protrusion 504 is in contact with the bottom cover 500 through the second groove 504, The heat generated from the heat source 10 can be discharged to the outside.

13A to 13C are cross-sectional views showing a second reflector including a plurality of planes.

13A to 13C, the second reflector 300 may include a fourth region that is a flat surface, a fifth region that is an inclined plane, and a sixth region that is a plane.

Here, the plane of the fourth region may be adjacent to the light source module 100, and the inclined plane of the fifth region may extend from the plane end of the fourth region and be inclined toward the lower surface of the second reflector 300.

The plane of the sixth region may extend from the end of the inclined surface of the fifth region and be parallel to the plane of the fourth region.

At this time, the inclined surface of the fifth region positioned between the fourth region and the sixth region may be a flat plane having a predetermined inclination angle, as shown in Fig. 13A, and may have a predetermined curvature And may be a convex curved surface having a predetermined curvature, as shown in Fig. 13C.

14A to 14C are sectional views showing a second reflector including a plurality of inclined surfaces.

14A to 14C, the second reflector 300 may include a fourth region that is a flat surface, a fifth region that is an inclined plane, and a sixth region that is a sloped surface.

Here, the plane of the fourth region may be adjacent to the light source module 100, the inclined plane of the fifth region may extend from the plane end of the fourth region and may be inclined toward the lower surface of the second reflector 300, The inclined surface of the region may extend from the end of the inclined surface of the fifth region and be inclined toward the first reflector 200.

At this time, the inclined surfaces of the fifth region and the sixth region may be a flat plane having a predetermined inclination angle as shown in Fig. 14A, and may be a concave curved surface having a predetermined curvature as shown in Fig. 14B , Or a convex curved surface having a predetermined curvature as shown in Fig. 14C.

That is, Fig. 14 (a) shows that two adjacent slopes have a flat surface, Fig. 14 (b) has a concave curved surface with two inclined surfaces adjacent to each other, and curvatures of two inclined surfaces may be different from each other, With a curved surface, the curvatures of the two inclined surfaces may be different.

On the other hand, in the fourth and fifth regions of the second reflector 300, a regular reflection sheet for regularly reflecting light can be formed, and the sixth region of the second reflector 300 can reflect the light regularly At least one of the diffusely reflecting sheets may be formed.

The reason why the regular reflection sheet is formed in the fourth and fifth regions of the second reflector 300 is that it can provide a uniform luminance by reflecting a lot of light to the central region of the second reflector 300 having a weak luminance Because.

The reason why the diffusing sheet is formed in the sixth region of the second reflector 300 is that the brightness can be compensated by diffusely reflecting the light in the sixth region of the second reflector 300 with low luminance.

The second reflector 300 may include a metal or metal oxide having a high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ ) In the reflector 300, the materials formed in the fourth, fifth, and sixth regions may be different from each other, or the surface roughness of the fourth, fifth, and sixth regions may be different from each other.

That is, the second, fourth, fifth, and sixth regions of the second reflector 300 may be formed of the same material and have different surface roughnesses.

Alternatively, the fourth, fifth, and sixth regions of the second reflector 300 may be formed of different materials and may have different surface roughnesses.

Meanwhile, the second 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.

The high reflectance, such as second reflector 300 may comprise at least one of a metal or metal oxide, e.g., aluminum (Al), silver (Ag), gold (Ag) or titanium dioxide (TiO ₂₎ The branch may comprise a metal or a metal oxide.

In this case, the second 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 second 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.

The second reflector 300 may have a structure in which a single layer having the same reflectance is formed on the entire polymer resin frame as the bottom plate. The second reflector 300 may have a structure in which a plurality of layers May be formed.

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

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 .

15 is a view showing a backlight unit in which an optical member is disposed.

As shown in FIG. 15, the optical member 600 may be disposed at a regular interval from the second reflector 300.

An air guide may be formed in a space between the second 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.

In addition, the second reflector 300 may comprise at least one of a metal or metal oxide, e.g., aluminum (Al), silver (Ag), gold (Au) or titanium dioxide (TiO ₂₎ and high as And a metal or metal oxide having reflectance.

The second reflector 300 may be formed of one of a reflective coating film and a reflective coating material layer and may reflect the light generated from the light source module 100 toward the optical member 600 .

The second reflector 300 may be formed with a serrated reflection pattern on the surface facing the optical member 600, and the surface of the reflection pattern may be flat or curved.

The reason for forming the reflection pattern on the surface of the second reflector 300 is that the light generated by the light source module 100 can be uniformly diffused and reflected.

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.

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

As shown in FIG. 16, 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.

17 and 18 are views showing a display device according to an embodiment.

17, 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.

18, the drive 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 first and a second reflector, a display device including the 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 can do.

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: first reflector
300: second reflector 201: plane
202: first inclined surface 203: second inclined surface

Claims (29)

A first reflector;
A second reflector; And,
And at least one light source module disposed between the first and second reflectors,
The lower surface of the first reflector faces the second reflector and includes a first region that is a first flat surface and a second region that is a first inclined plane,
Wherein the first plane is adjacent to the light source module, the first inclined plane extends from an end of the first plane and is inclined toward the second reflector,
The end of the first inclined surface is positioned in the same collinear shape as the light source module,
The lower surface of the first reflector further comprises a third region which is a second inclined surface,
Wherein the second inclined surface extends from the first inclined surface end of the second region and slopes toward the upper surface of the first reflector. delete The method of claim 1, wherein the first angle between the extension of the first plane and the first slope is less than the second angle between the extension of the first plane and the second slope,
Wherein a contact point at which the first inclined surface meets the second inclined surface is collinear with the light source of the light source module and the contact point is located between the widths of the light source. delete delete 4. The reflector according to claim 1 or 3, wherein a first thickness between the first reflector upper surface and the first reflector lower surface is greater than a first thickness between the first reflector upper surface and the first reflector lower surface Thinner than the second thickness between the ends of the first inclined faces,
Wherein the first thickness is 0.1 - 0.9 times the second thickness,
Wherein an area of the second inclined plane is smaller than an area of at least one of the first plane and the first inclined plane. delete delete delete 7. The illumination system according to claim 6, wherein the second inclined surface is a concave curved surface, a convex curved surface, a flat plane, or both, and has a plurality of grooves. delete 4. The method according to claim 1 or 3, wherein the area of the first inclined surface is larger than the area of the first plane,
Wherein the light source module is spaced apart from the second reflector by a first spacing and from the first reflector by a second spacing. delete 13. The reflector of claim 12, wherein the upper surface of the second reflector faces a first reflector, and includes a fourth region that is a flat surface and a fifth region that is a third inclined plane,
Wherein the second plane is adjacent to the light source module and the third inclined plane extends from an end of the second plane and tilts toward a lower surface of the second reflector. 15. The method of claim 14, wherein the second spacing is less than the first spacing,
The area of the second plane of the second reflector is wider than the area of the first plane of the first reflector,
The upper surface of the second reflector
Further comprising a sixth region adjacent to the fifth region and being at least one of a planar surface and an inclined surface,
Wherein a plane of the sixth region is parallel to a second plane of the fourth region and an inclined plane of the sixth region extends from a third inclined plane end of the fifth region to be inclined toward the first reflector. delete delete delete delete 4. The reflector according to claim 1 or 3, wherein the upper surface of the first reflector is a plane parallel to the first plane of the lower surface of the first reflector,
Wherein the upper surface of the first reflector includes at least one support surface for supporting the optical member, the support surface and the upper surface of the first reflector are on different lines,
Wherein the thickness between the support surface and the first reflector upper surface is thinner than the thickness between the upper surface of the first reflector and the lower surface of the first reflector. delete delete The light source module according to claim 1 or 3, further comprising a heat dissipating member for dissipating heat of the light source module,
The heat dissipating member includes first and second side surfaces facing each other,
Wherein the first side surface of the heat radiation member is in contact with the light source module and the first reflector,
Wherein at least one heat dissipating protrusion is formed on the second side surface of the heat dissipating member,
Wherein the first plane of the first reflector is a regular reflection area regularly reflecting light and the first inclined plane of the first reflector is at least one of a regular reflection area regularly reflecting the light and a diffusely reflecting area diffusely reflecting the light. The lighting system according to claim 23, wherein the heat radiating member is made of the same material as the first reflector, and the heat radiating member and the first reflector are one body type. The lighting system according to claim 23, wherein the heat radiating member is made of a material different from that of the first reflector, and the heat radiating member and the first reflector are of a seperation type. 24. The projector according to claim 23, further comprising a bottom cover for supporting the heat radiating member and the second reflector,
Wherein the bottom cover includes at least one first groove on which the heat radiation member is mounted and at least one second groove on which the heat radiation projection is seated. delete The lighting system according to claim 23, further comprising an optical member disposed at a predetermined interval from the second reflector, wherein an air guide is formed in a space between the second reflector and the optical member. delete

Images