KR20130058516A - Backlight unit and illumination system using the same - Google Patents

Abstract

PURPOSE: A backlight unit and a lighting system using the same are provided to reduce yellowish regions occurring around a light source module by partially changing the structure of a reflector which is adjacent to the light source module. CONSTITUTION: A backlight unit comprises a first reflector(200), a second reflector(300), and at least one light source module(100). The at least one light source module is disposed between the first and second reflectors. The bottom surface(200a) of the first reflector faces the second reflector, and includes a first region adjoining the light source and a second region adjoining the first region. The first region is a flat surface(202) and the second region is an inclined plane(204). The thickness of the second region becomes thin as distance from the light source module increases. [Reference numerals] (AA) First region; (BB) Second region

Description

Backlight unit and illumination system using the same}

Embodiments relate to a backlight unit and a lighting system.

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

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

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

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

CCFL (Cold Cathode Fluorescent Lamp) was used as the light source of the existing edge type or direct type backlight unit.

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

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

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

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

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

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

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

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

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

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

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

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

In addition, the embodiment is to provide a backlight unit and an illumination system using the same that can change the structure of the reflector adjacent to the light source module, thereby reducing the yellowish region appearing near the light source module.

An embodiment includes a first reflector, a second reflector, and at least one light source module disposed between the first and second reflectors, the bottom surface of the first reflector facing the second reflector, A first area adjacent to the module and a second area adjacent to the first area, the first area being a flat surface, the second area being an inclined plane, and the thickness of the second area being equal to the above. The further away from the light source module, the thinner it may be.

Here, the lower surface of the first region may be a plane parallel to the upper surface of the first reflector, and the lower surface of the second region may be an inclined plane inclined with respect to the upper surface of the first reflector.

The second region includes a first end portion adjacent to the first region and a second end facing the first end, wherein the first end thickness of the second region is the second end thickness of the second region. Thicker and may be equal to the thickness of the first region.

Subsequently, the second region includes a first end portion adjacent to the first region and a second end facing the first end, wherein the first end thickness of the second region is the second end thickness of the second region. Thicker and may be thicker than the thickness of the first region.

In addition, the inclined surface of the second region may be at least one of a convex curved surface, a concave curved surface and a flat plane.

Next, the width of the first area and the width of the second area may be different from each other, and the area of the inclined surface and the area of the plane may be different from each other.

Subsequently, the second region may include a contact portion where the upper surface and the lower surface of the first reflector meet, and the contact portion may have a round shape or an angular shape.

The at least one inclined surface of the second region may include a reflective pattern, and the at least one reflective pattern may be formed at a portion of the end of the inclined surface of the second region.

In addition, the light source module may include a substrate and at least one light source arranged on the substrate, and a boundary line between the first region and the second region may be located on the same collinear surface as the surface of the light source.

Subsequently, the first region and the second region may be specular reflection regions that specularly reflect light, the first region may be specular reflection regions that specularly reflect light, and the second region may be diffuse reflection regions that specularly reflect light.

Here, a part of the second area may be a specular reflection area that specularly reflects light, and the remainder of the second area may be a diffuse reflection area that diffusely reflects light.

In addition, the area of the specular reflection area and the area of the diffuse reflection area may be different from each other.

The upper surface of the first reflector includes a third region corresponding to the plane of the first reflector lower surface and a fourth region corresponding to the inclined surface of the first reflector lower surface, wherein the third region and the fourth region are mutually opposite. It can be located on another line.

Here, the width of the third region and the width of the fourth region may be different.

In addition, the width of the third region may be different from the plane width of the first reflector lower surface, and the width of the fourth region may be different from the inclined surface width of the first reflector lower surface.

Subsequently, the third region may be a plane, the fourth region may be an inclined surface, and the inclined surface of the fourth region may be inclined at a second angle from the plane of the third region.

The inclined surface of the first reflector lower surface may be inclined at a first angle from the plane of the first reflector lower surface, and the first angle may be different from the second angle.

Next, the second reflector includes fifth and sixth regions, the fifth region being a first inclined surface aligned with the light source module and the first reflector and inclined downward, and the sixth region is the fifth region. It may be a plane parallel to the plane of the first reflector bottom surface or a second inclined surface inclined in an upward direction.

Here, the inclined surface of the lower surface of the first reflector may be arranged in alignment with at least one of the fifth and sixth regions of the second reflector.

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

In addition, embodiments may reduce the yellowish region appearing near the light source module and remove the dark region by changing the reflector partial structure adjacent to the light source module.

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

1 is a cross-sectional view showing a typical backlight unit
2 is a cross-sectional view illustrating a backlight unit according to an embodiment.
3 is a cross-sectional view illustrating a structure of the first reflector of FIG. 2.
4A-4C show the inclined plane of the first reflector
5A to 5C are views comparing widths of the first region and the second region of the first reflector lower surface;
6A and 6B are cross-sectional views showing the inclined end of the first reflector.
7A and 7B are cross-sectional views showing reflective patterns formed on the first reflector.
8A to 8D are cross-sectional views showing shapes of reflective patterns formed on the first reflector.
9A and 9B are cross-sectional views showing the positional relationship between the first region of the first reflector and the light source module;
10A to 10D are cross-sectional views showing a first reflector including specular reflection areas
11A to 11C are cross-sectional views showing widths of the specular reflection region and the diffuse reflection region formed on the inclined surface of the first reflector.
12A-12C are cross-sectional views showing the top surface width of the first reflector.
13 is a cross-sectional view showing an inclined surface formed on the upper surface of the first reflector.
14A-14C are cross-sectional views showing the length of the first reflector
15A to 15D are cross-sectional views illustrating an arrangement relationship between a light source module and first and second reflectors.
16A-16C are cross-sectional views showing a second reflector including multiple inclined surfaces.
17A-17C are cross-sectional views showing a second reflector comprising an inclined surface and a plane
18 is a view illustrating a backlight unit in which an optical member is disposed;
19 is a view showing a measurement position for measuring a change in luminance and a yellow section appearing in an area adjacent to the light source module;
20 is a graph showing a change in luminance appearing in an area adjacent to the light source module.
21A and 21B are graphs illustrating a change in a yellow section appearing in an area adjacent to the light source module.
22 illustrates a display module having a backlight unit according to an embodiment.
23 and 24 illustrate a display device according to an embodiment.

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

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

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

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

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

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

In some cases, the light source module 100 may be disposed away from the second reflector 300 at the same time as being in contact with the first reflector 200, or may be disposed in contact with the second reflector 300 and at the same time as the first reflector 300. 200 may be spaced apart from each other.

Alternatively, the light source module 100 may be disposed apart from the first reflector 200 and the second reflector 300 by a predetermined distance, 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 printed circuit board (PCB) substrate made of any one material selected from polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon (Si), or may be formed in a film form. have.

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

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

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

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

Next, the first reflector 200 and the second reflector 300 may face each other at a predetermined interval so as to have an air guide in the empty space between the first reflector 200 and the second reflector 300. have.

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

Here, the lower surface 200a of the first reflector 200 may face the second reflector 300 and include a first region and a second region according to a distance from the light source module 100.

That is, the first region may be adjacent to the light source module 100, and the second region may be adjacent to the first region.

In this case, the first region may be a flat surface 202, and the second region may be an inclined plane 204.

Here, the first region is a plane 202 parallel to the upper surface 200b of the first reflector 200, and the second region is an inclined surface inclined with respect to the upper surface 200b of the first reflector 200. inclined plane) 204.

The thickness of the second region may become thinner as it moves away from the light source module 100.

In addition, the area of the second area may be larger than the area of the first area, and in some cases, the area of the second area and the area of the first area may be the same.

As such, the reason for forming the second region of the first reflector 200 as an inclined surface is that a yellowish region appears at the end of the first reflector 200 by sending light to the end of the first reflector 200. This is because not only can be reduced, but it is also possible to remove the dark portion appearing at the end of the first reflector 200.

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

The first reflector 200 may have a sawtooth reflective pattern formed on a portion of the lower surface thereof.

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

As such, the reason for forming the reflective pattern on a part of the surface of the first reflector 200 is to diffuse the light generated by the light source module 100 to remove the dark region and make the overall luminance uniform.

Next, the second reflector 300 may have an inclined plane on a portion thereof, and may have a metal having high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ ), or the like. It may comprise 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 a surface 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, or a flat surface. It may be at least one of).

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

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

3 is a cross-sectional view illustrating a structure of the first reflector of FIG. 2.

As shown in FIG. 3, the lower surface 200a of the first reflector 200 may include a first area and a second area according to a distance from the light source module 100.

Here, the first region may be an area adjacent to the light source module 100, and the second region may be an area far from the light source module 100 and disposed adjacent to the first area.

In this case, the first region may be a flat surface 202, and the second region may be an inclined plane 204.

That is, the first region is a plane 202 parallel to the upper surface 200b of the first reflector 200, and the second region is an inclined surface inclined with respect to the upper surface 200b of the first reflector 200. inclined plane) 204.

The second region includes a first end portion adjacent to the first region and a second end facing the first end, and the thickness t21 of the first end of the second region is the second end of the second region. It may be thicker than the thickness t22.

That is, the second region may gradually become thinner from the first end to the second end.

In addition, the first end thickness t21 of the second region may be the same as the thickness t1 of the first region.

In some cases, the first end thickness t21 of the second region may be thicker than the thickness t1 of the first region.

In this case, the thickness ratio of the first end thickness t21 of the second region to the thickness t1 of the first region may be 1.1-3: 1.

In addition, an area of the inclined surface 204 of the second area may be wider than that of the plane 202 of the first area.

Here, the area ratio between the plane 202 of the first region and the inclined surface 204 of the second region may be 1: 1.1-15.

In some cases, the area of the inclined surface 204 of the second region may be the same as the area of the plane 202 of the first region.

Alternatively, the area of the inclined surface 204 of the second area may be smaller than the area of the plane 202 of the first area.

4A to 4C are diagrams showing the inclined surface of the first reflector.

As shown in FIGS. 4A to 4C, the lower surface of the first reflector 200 may include a first region and a second region according to a distance from the light source module 100.

Here, the first region may be a flat surface 202, and the second region may be an inclined plane 204.

In this case, the inclined surface 204 of the second region may be at least one of a concave curved surface, a convex curved surface, and a flat plane.

In the case of FIG. 4A, the inclined surface 204 of the first reflector 200 may be a concave curved surface having a predetermined curvature R.

4B, the inclined surface 204 of the first reflector 200 may be a convex curved surface having a predetermined curvature R. In FIG. 4C, the inclined surface 204 of the first reflector 200 may be predetermined. It may be a flat plane with an inclination angle.

5A to 5C are diagrams comparing the widths of the first region and the second region of the first reflector lower surface.

5A through 5C, the lower surface of the first reflector 200 may include a first region and a second region according to a distance from the light source module 100.

Here, the first region may be a flat surface 202, and the second region may be an inclined plane 204.

In this case, the width w2 of the second region may be wider or narrower than the width w1 of the first region.

The width w2 of the second region and the width w1 of the first region may be the same.

In the case of FIG. 5A, the width w2 of the second region is an embodiment showing the first reflector 200 that is wider than the width w1 of the first region. In FIG. 5B, the width w2 of the second region and the width of the first region are illustrated. w1 is an embodiment showing the same first reflector 200, and in FIG. 5C, the width w2 of the second region is an embodiment showing the first reflector 200 narrower than the width w1 of the first region.

As such, the reason for manufacturing the second region of the first reflector 200 in various widths is that the width of the second region of the first reflector 200 varies according to the total area size of the second reflector 300. Because.

That is, since the second area of the first reflector 200 is an inclined surface, if the width of the second area is wider than the first area, the light generated from the light source module is transmitted to the light source module of the second reflector 300. You can send more to an area farther from the light source module than to an adjacent area.

Therefore, as the total area of the second reflector 300 increases, the width of the second region of the first reflector 200 may be made larger than the width of the first region of the first reflector 200.

6A and 6B are sectional views showing the inclined end of the first reflector.

As illustrated in FIGS. 6A and 6B, the lower surface 200a of the first reflector 200 may include a first region and a second region according to a distance from the light source module 100.

Here, the first region may be a plane 202 and the second region may be an inclined surface 204.

The second region may include a first end portion adjacent to the first region and a second end facing the first end.

Here, the second end of the second region may include a contact portion A where the upper surface and the lower surface of the first reflector 200 meet.

In this case, the contact portion A may have a round shape as shown in FIG. 6A, or may have an angular shape as shown in FIG. 6B.

The reason for this is that light can also be transmitted to the end of the first reflector 200, whereby the dark portion appearing at the end of the first reflector 200 can be removed.

7A and 7B are cross-sectional views illustrating reflective patterns formed on the first reflector.

As shown in FIGS. 7A and 7B, the first reflector 200 may include a plane 202 formed in the first region of the lower surface and an inclined surface 204 formed in the second region of the lower surface. In addition, a plurality of reflective patterns 230 may be formed on the inclined surface 204 of the second region.

Here, the reflective pattern 230 may be formed only in a partial region of the inclined surface 204 of the second region as shown in FIG. 7A, or may be formed in the entire region of the inclined surface 204 of the second region as illustrated in FIG. 7B. have.

When the reflective pattern 230 is formed on a part of the inclined surface 204, the reflective pattern 230 may be formed at the end of the inclined surface 204 of the second region.

The reason is that, by diffusing light at the end of the first reflector 200, not only the dark portion appearing at the end of the first reflector 200 can be removed, but also the yellow section (appearing at the end of the first reflector 200) yellowish region).

8A to 8D are cross-sectional views illustrating shapes of reflective patterns formed on the first reflector.

As shown in FIGS. 8A to 8D, the first reflector 200 may include a plane 202 formed in the first region of the lower surface and an inclined surface 204 formed in the second region of the lower surface. In addition, a plurality of reflective patterns 230 may be formed on the inclined surface 204 of the second region.

8A shows that the reflective pattern 230 is serrated, the surface of the reflective pattern 230 is flat, and FIGS. 8B and 8C show that the reflective pattern 230 is serrated, and the surface of the reflective pattern 230 is curved. Can be.

Here, FIG. 8B illustrates a curved surface of which the surface of the reflective pattern 230 is concave, and FIG. 8C illustrates a curved surface of which the surface of the reflective pattern 230 is convex.

In some cases, as shown in FIG. 8D, the size of the reflective pattern 230 may gradually increase from one end of the second region of the first reflector 200 to the other end.

That is, the size of the reflective pattern 230 may be non-uniform. The size of the reflective pattern 230 may be larger than the reflective pattern 230 positioned closer to the light source module than the reflective pattern 230 positioned closer to the light source module. have.

As such, the reason for forming the reflective pattern 230 on the inclined surface 204 of the first reflector 200 and the second region may not only remove the dark portion appearing at the end of the second region of the first reflector, This is because by reducing the yellowish region appearing at the end of the reflector 200, it is possible to provide a uniform brightness as a whole.

Therefore, the reflective pattern 230 may be manufactured in various sizes in the corresponding area according to the overall luminance distribution of the backlight.

9A and 9B are cross-sectional views illustrating a positional relationship between the first region of the first reflector and the light source module.

 As shown in FIGS. 9A and 9B, the first region of the lower surface of the first reflector 200 is a plane 202 parallel to the upper surface 200b of the first reflector 200, and the first reflector ( The second region of the lower surface may be an inclined surface 204 inclined with respect to the upper surface 200b of the first reflector 200.

Here, the plane 202 of the first region and the inclined surface 204 of the second region may be divided by a boundary line, and the boundary line between the first region and the second region may be divided into the light source module 100 as shown in FIG. 9A. It may be located in the same collinear with the surface 101 of the light source (100a).

In some cases, the boundary line between the first region and the second region may be located in a different collinear shape from the surface 101 of the light source 100a of the light source module 100, as shown in FIG. 9B.

That is, the light source module 100 may be positioned not to cross the boundary line between the first area and the second area.

Therefore, the light source module 100 including the substrate 100b and the light source 100a may be located in the first region of the first reflector 200.

As such, when the light source module 100 is located in the first region, the light generated from the light source module 100 may be concentrated by the inclined surface 204 of the second region to the center region of the second reflector having low luminance. In addition, it is possible to provide uniform luminance as a whole.

10A to 10D are cross-sectional views showing a first reflector including specular reflection areas.

As shown in FIGS. 10A to 10D, the lower surface of the first reflector 200 may include at least one of a specular reflection region that specularly reflects light and a diffuse reflection region that specularly reflects light.

In the case of FIG. 10A, the bottom surface of the first reflector 200 may include a first region having a plane 202 and a second region having an inclined surface 204, the plane 202 and the inclined surface 204. All of these may be specular reflection areas.

That is, a specular reflection sheet for specularly reflecting light may be disposed on the inclined surface 204 and the plane 202.

10B, the lower surface of the first reflector 200 may include a first region having a plane 202 and a second region having an inclined surface 204, where the plane 202 is a specular reflection area. The inclined surface 204 may be a diffuse reflection area.

That is, the specular reflection sheet for specularly reflecting light may be disposed on the plane 202, and the specular reflection sheet for specularly reflecting light may be disposed on the inclined surface 204.

Next, in FIGS. 10C and 10D, the bottom surface of the first reflector 200 may include a first region having a plane 202 and a second region having an inclined surface 204, which is a plane 202. Is a specular reflection area, and the inclined surface 204 may include both a specular reflection area and a diffuse reflection area.

Here, as shown in FIG. 10C, an area adjacent to the plane 202 of the inclined surface 204 may be a specular reflection area, and an area far from the plane 202 may be a diffuse reflection area.

As shown in FIG. 10D, an area adjacent to the plane 202 of the inclined surface 204 may be a diffuse reflection area, and an area far from the plane 202 may be a specular reflection area.

As such, when the specular reflection sheet is disposed on the first reflector 200, hot light can be prevented by reflecting a lot of light to the second reflector 300, and when the diffuse reflection sheet is disposed on the first reflector 200, luminance is obtained. Light is also transmitted to a portion of the weak second reflector 300 to compensate for the weak luminance.

11A to 11C are cross-sectional views showing widths of the specular reflection region and the diffuse reflection region formed on the inclined surface of the first reflector.

As shown in FIGS. 11A-11C, the bottom surface of the first reflector 200 may include a first region having a plane 202 and a second region having an inclined surface 204, which is a plane 202. ) Is a specular reflection area, and the inclined surface 204 may include both a specular reflection area and a diffuse reflection area.

Here, in the inclined surface 204, an area adjacent to the plane 202 may be a specular reflection area, and an area far from the plane 202 may be a diffuse reflection area.

In this case, the width w3 of the specular reflection area and the width w4 of the diffuse reflection area may be the same as in FIG. 11A.

Therefore, the area of the specular reflection area and the area of the diffuse reflection area may be the same.

However, in some cases, the width w3 of the specular reflection area and the width w4 of the diffuse reflection area may be different from each other, as shown in FIGS. 11B and 11C.

Here, as shown in FIG. 11B, the width w3 of the specular reflection area may be larger than the width w4 of the diffuse reflection area, and as shown in FIG. 11C, the width w3 of the specular reflection area may be smaller than the width w4 of the diffuse reflection area.

12A to 12C are cross-sectional views showing the top surface width of the first reflector.

First, as shown in FIG. 12A, the upper surface 200b of the first reflector 200 includes a third region 206 adjacent to the light source module and a fourth region 208 adjacent to the third region 206. It may include.

Here, the third region 206 of the upper surface 200b of the first reflector 200 corresponds to the plane 202 of the lower surface 200a of the first reflector 200, and the upper surface of the first reflector 200 ( The fourth region 208 of 200b may correspond to the inclined surface 204 of the lower surface 200a of the first reflector 200.

Subsequently, the third region 206 and the fourth region 208 are planar, and may be located on the same line as each other.

The width w5 of the third region 206 and the width w6 of the fourth region 208 may be different from each other.

That is, the plane width w5 of the third region 206 and the plane width w6 of the fourth region 208 may be different from each other. For example, the plane width w5 of the third region 206 is the fourth region 208. May be smaller than the plane width w6.

The reason is that not only the dark portion appearing at the end of the first reflector can be removed, but also the overall uniform luminance can be provided by reducing the yellowish region appearing at the end of the first reflector 200. to be.

In some cases, the widths of the third region 206 and the fourth region 208 may be the same.

In addition, the width w5 of the third region 206 may be equal to the width w1 of the plane 202 of the lower surface 200a of the first reflector 200, and the width w6 of the fourth region 208 may be the first reflector ( 200) the width of the inclined surface w2 of the lower surface 200a may be the same.

Subsequently, as shown in FIG. 12B, the third region 206 and the fourth region 208 may be planar and positioned on different lines.

That is, the plane of the third region 206 may be disposed at a lower position than the plane of the fourth region 208.

The planar width w5 of the third region 206 and the planar width w6 of the fourth region 208 may be different from each other. For example, the planar width w5 of the third region 206 may be different from the fourth region 208. May be smaller than the plane width w6.

In some cases, the widths of the third region 206 and the fourth region 208 may be the same.

In addition, the width w5 of the third region 206 may be equal to the width w1 of the plane 202 of the lower surface 200a of the first reflector 200, and the width w6 of the fourth region 208 may be the first reflector ( 200) the width of the inclined surface w2 of the lower surface 200a may be the same.

Subsequently, as illustrated in FIG. 12C, the third region 206 and the fourth region 208 may be planar and positioned on different lines.

That is, the plane of the third region 206 may be disposed at a lower position than the plane of the fourth region 208.

The planar width w5 of the third region 206 and the planar width w6 of the fourth region 208 may be different from each other. For example, the planar width w5 of the third region 206 may be different from the fourth region 208. May be smaller than the plane width w6.

In some cases, the widths of the third region 206 and the fourth region 208 may be the same.

In addition, the width w5 of the third region 206 may be different from the width w1 of the plane 202 of the lower surface 200a of the first reflector 200, and the width w6 of the fourth region 208 may be the first reflector 200. ) May be different from the inclined surface width w2 of the lower surface 200a.

That is, the width w5 of the third region 206 may be larger than the width w1 of the plane 202 of the lower surface 200a of the first reflector 200, and the width w6 of the fourth region 208 may be the first reflector ( 200) may be smaller than the inclined surface width w2 of the lower surface 200a.

As such, the reason why the plane of the third region 206 is disposed at a lower position than the plane of the fourth region 208 is because the thickness of the third region 206 of the first reflector 200 is reduced, thereby reducing the thickness of the first region. The overall weight of the reflector can be reduced.

13 is a cross-sectional view illustrating an inclined surface formed on an upper surface of the first reflector.

As shown in FIG. 13, the upper surface 200b of the first reflector 200 includes a third region 206 adjacent to the light source module and a fourth region 209 adjacent to the third region 206. can do.

Here, the third region 206 of the upper surface 200b of the first reflector 200 corresponds to the plane 202 of the lower surface 200a of the first reflector 200, and the upper surface of the first reflector 200 ( The fourth region 209 of 200b may correspond to the inclined surface 204 of the lower surface 200a of the first reflector 200.

Subsequently, the third region 206 may be planar, and the fourth region 209 may be an inclined surface.

In this case, the inclined surface of the fourth region 209 may be inclined at a second angle θ2 from the plane of the third region 206.

The inclined surface 204 of the lower surface of the first reflector 200 may be inclined at a first angle θ1 from the plane 202 of the lower surface of the first reflector 200.

Here, the first angle θ1 may be different from the second angle θ2, for example, the first angle θ1 may be greater than the second angle θ2.

In some cases, the first angle θ1 may be the same as the second angle θ2.

As such, the reason for forming the inclined surface in the fourth region 209 of the first reflector 200 is to diffuse light into the fourth region 209 which is the upper surface of the first reflector 200, thereby bezel. The width of the display can be reduced, and the active area of the display can be increased.

14A to 14C are cross-sectional views showing the length of the first reflector.

As shown in FIGS. 14A to 14C, the second reflector 300 may include a fifth region adjacent to the light source module 100 and a sixth region adjacent to the fifth region.

The fifth region of the second reflector 300 may be aligned with the light source module 100 and the first reflector 200 and may have a first inclined surface inclined downward.

In addition, the sixth region of the second reflector 300 may be adjacent to the fifth region and have a second inclined surface that is parallel to the plane of the lower surface of the first reflector 200 or is inclined upward.

Subsequently, the lower surface of the first reflector 200 may include an inclined surface 204 positioned between the first and second planes, and the inclined surface 204 of the lower surface of the first reflector 200 may have a second reflector 300. ) May be arranged in alignment with at least one of the fifth region and the sixth region.

14A illustrates an exemplary embodiment in which the inclined surface 204 of the lower surface of the first reflector 200 is aligned with the fifth region of the second reflector 300, and FIG. 14B illustrates the inclined surface of the lower surface of the first reflector 200. 204 is an embodiment in which the end of the first reflector 200 is aligned with the fifth region of the second reflector 300 while being aligned with the boundary point P between the fifth and sixth regions, and FIG. 14C. Is an embodiment in which the inclined surface 204 of the lower surface of the first reflector 200 is disposed over the fifth region and the sixth region of the second reflector 300.

As such, the length of the first reflector 200 may vary according to various embodiments.

15A to 15D are cross-sectional views illustrating an arrangement relationship between the light source module and the first and second reflectors.

FIG. 15A is a view illustrating a light source module 100 spaced apart from the first reflector 200 and the second reflector 300 by a predetermined distance, and FIG. 15B simultaneously shows the first reflector 200 and the second reflector 300. FIG. 15C is a view showing a light source module 100 in contact with each other, and FIG. 15C is a view showing a light source module 100 contacting the first reflector 200 and being spaced apart from the second reflector 300 by a predetermined distance. The light source module 100 disposed at a predetermined distance from the first reflector 200 and in contact with the second reflector 300 is shown.

As shown in FIG. 15A, the light source module 100 may be spaced apart from the first reflector 200 by a first distance d1 and spaced apart from the second reflector 300 by a second distance d2.

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

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

The reason is that when the first distance d1 is larger than the second distance d2, a hot spot phenomenon may appear.

Subsequently, as shown in FIG. 15B, 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 is in contact with the first and second reflectors 200 and 300, thereby preventing hot spots and transmitting light to an area far from the light source module 100, and also the thickness of the entire backlight unit. You can also reduce the

As shown in FIG. 15C, 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 d.

Here, the light source module 100 may be in contact with the first reflector 200 to prevent hot spots and transmit light to a region far from the light source module 100.

Next, as shown in FIG. 15D, the light source module 100 may contact the second reflector 300 and may be spaced apart from the first reflector 200 by a distance d.

16A to 16C are cross-sectional views showing a second reflector including a plurality of inclined surfaces.

FIG. 16A has a flat surface with two inclined surfaces adjacent to each other, FIG. 16B has a concave surface with two inclined surfaces adjacent to each other, the curvature of the two inclined surfaces may be different from each other, and FIG. 16C shows a convex surface with two inclined surfaces adjacent to each other In addition, the curvatures of the two inclined surfaces may be different from each other.

As shown in FIGS. 16A to 16C, the second reflector 300 may include a fifth region adjacent to the light source module 100 and a sixth region away from the light source module 100.

Here, the fifth region and the sixth region of the second reflector 300 may be inclined surfaces.

17A to 17C are cross-sectional views showing a second reflector including an inclined surface and a plane.

FIG. 17A has a flat surface of the inclined surface of the second reflector 300, FIG. 17B has a concave surface of the inclined surface of the second reflector 300, and FIG. 17C has a curved surface of which the inclined surface of the second reflector 300 is convex. Can be.

Here, the fifth region of the second reflector 300 may be an inclined surface, and the sixth region may be a flat surface.

Meanwhile, the fifth region of the second reflector 300 may have a specular reflection sheet for specularly reflecting light, and the sixth region of the second reflector 300 may be a specular reflection sheet for specularly reflecting light and the diffuse reflection sheet for specularly reflecting light. At least one may be formed.

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

The reason why the diffuse reflection sheet is formed in the sixth region of the second reflector 300 is that the luminance can be compensated by the diffuse reflection of light in the sixth region of the second reflector 300 having low luminance.

In addition, the second reflector 300 may include a metal or a metal oxide having high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ ), or the like. The reflectors 300 may have different materials formed in the fifth and sixth regions, and may have different surface roughnesses of the fifth and sixth regions.

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

Alternatively, the second reflector 300 may be formed of different materials from the fifth and sixth regions, 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 may be a reflective coating material layer on which a reflective material is deposited.

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

In this case, the second reflector 300 may be formed by depositing or coating a metal or metal oxide on the polymer resin frame 430 which is a bottom plate, or by printing a metal ink.

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

In addition, the second reflector 300 may be manufactured in the form of a film or sheet and adhered to the polymer resin frame.

Here, 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 which is a bottom plate, and the second reflector 300 has a plurality of layers having different reflectances on the entire polymer resin frame. The structure may be formed.

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

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

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

As shown in FIG. 18, the optical member 600 may be disposed at a predetermined interval from the second reflector 300.

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

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

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

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

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

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

In some cases, the optical member 600 may include at least one sheet, and may selectively include a diffusion sheet, a prism sheet, a brightness enhancement sheet, and the like.

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

In addition, the second reflector 300 may include at least one of a metal or a metal oxide, and may be, for example, high, such as aluminum (Al), silver (Ag), gold (Au), or titanium dioxide (TiO ₂ ). It may comprise a metal or metal oxide having a reflectance.

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

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

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

As such, the embodiments may provide a reflector for an air guide having some inclined surfaces without using a light guide plate, thereby being light in weight, low in manufacturing cost, and providing uniform luminance.

In addition, embodiments may reduce the yellowish region appearing near the light source module and remove the dark region by changing the reflector partial structure adjacent to the light source module.

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

FIG. 19 is a diagram illustrating a measurement position for measuring a change in luminance and a yellow section appearing in an adjacent region of a light source module, FIG. 20 is a graph illustrating a change in luminance occurring in an adjacent region of a light source module, and FIGS. 21A and 21B are light source modules. It is a graph showing the change of yellow section appearing in the adjacent area.

First, FIG. 19 is a two-edge structure in which the light source modules 100 are disposed on both sides of the second reflector 300, and the light source modules 100 are arranged on the substrate 100b and the substrate 100b. It may include a plurality of light sources (100a).

Although not shown in the drawings, the first reflector having the inclined surface at the end was used to measure the change in luminance and yellow section appearing at a plurality of measurement points.

Subsequently, although not shown, a change in the luminance and the yellow section appearing at a plurality of measurement points was measured using a first reflector having no inclined surface at the end.

Here, the plurality of measurement points are selected as the measurement points according to the distance from the light source module 100, and about 6 measurement points are selected in FIG. 19.

In this case, the first measurement point P1 may be located at the point farthest from the light source module 100, and the sixth measurement point P6 may be located at the point closest to the light source module 100.

For example, a structure using a first reflector having an inclined surface at the end is called first embodiment E1, and a structure using a first reflector having no inclined surface at the end is called second embodiment E2. As can be seen, in the case of the first embodiment E1, the luminance appearing at the first to sixth measurement points P1 to P6 is higher than that of the second embodiment E2.

Therefore, when the first reflector having the inclined surface at the end is used, since the luminance increases in the region adjacent to the light source module 100, the dark portion appearing near the light source module 100 can be removed.

In addition, as shown in FIGS. 21A and 21B, for the first embodiment E1, it can be seen that the x and y color coordinates appearing at the first to sixth measurement points P1 to P6 are higher than the second embodiment E2. have.

Therefore, when the first reflector having the inclined surface at the end is used, since the x and y color coordinates increase in the region adjacent to the light source module 100, the yellowish region appearing near the light source module 100 is greatly reduced. Can be.

22 is a diagram illustrating a display module having a backlight unit according to an embodiment.

As shown in FIG. 22, 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.

23 and 24 illustrate a display apparatus according to an embodiment.

Referring to FIG. 23, the display apparatus 1 includes a display module 20, a front cover 30 surrounding the display module 20, a back cover 35, and a driver 55 provided in the back cover 35. And a driving unit cover 40 surrounding the driving unit 55.

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

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

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

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

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

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

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

On the other hand, as shown in FIG. 24, the driving control unit 55a of the driving unit 55 may be provided in the back cover 35, and the main board 55b and the power board 55c may be provided in the stand 60. have.

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

In the embodiment, the main board 55b and the power board 55c are separately formed. However, the present invention is not limited thereto.

Yet another embodiment may be implemented with a display device including a first, a second reflector, a light source module, an indicator device, and a lighting system described in the above embodiments, for example, the lighting system includes a lamp and a street lamp. 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.

Features, structures, effects, and the like described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in each embodiment may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

100: light source module 200: first reflector
300: second reflector 202: plane
204: slope

Claims (25)

A first reflector;
A second reflector; And,
At least one light source module disposed between the first and second reflectors,
A lower surface of the first reflector facing the second reflector and including a first region adjacent to the light source module and a second region adjacent to the first region,
The first area is a flat surface, the second area is an inclined plane,
The thickness of the second area becomes thinner as the distance from the light source module. 2. The inclined surface of claim 1, wherein the lower surface of the first region is a plane parallel to the upper surface of the first reflector, and the lower surface of the second region is inclined with respect to the upper surface of the first reflector. plane). The method of claim 1, wherein the second region comprises a first end portion adjacent to the first region and a second end facing the first end, wherein the first end thickness of the second region is The backlight unit is thicker than the thickness of the second end of the second region and is equal to the thickness of the first region. The method of claim 1, wherein the second region comprises a first end portion adjacent to the first region and a second end facing the first end, wherein the first end thickness of the second region is The backlight unit is thicker than the thickness of the second end of the second region, and thicker than the thickness of the first region. The backlight unit of claim 1, wherein the inclined surface of the second region is at least one of a convex curved surface, a concave curved surface, and a flat plane. The backlight unit of claim 1, wherein a width of the first area and a width of the second area are different from each other. The backlight unit of claim 1, wherein an area of the inclined surface and the area of the plane are different from each other. The backlight unit of claim 1, wherein the second region includes a contact portion where an upper surface and a lower surface of the first reflector meet each other, and the contact portion has a round shape or an angular shape. The backlight unit of claim 1, wherein the inclined surface of the second region comprises a reflective pattern at least in part. The backlight unit of claim 9, wherein the reflective pattern is formed at a portion of an end portion of the inclined surface of the second region. The light source module of claim 1, wherein the light source module includes a substrate and at least one light source arranged on the substrate, and a boundary line between the first region and the second region is collinear with the surface of the light source. Backlight unit. The backlight unit of claim 1, wherein the first region and the second region are specular reflection regions that specularly reflect light. The backlight unit of claim 1, wherein the first region is a specular reflection region that specularly reflects light, and the second region is a diffuse reflection region that specularly reflects light. The backlight unit of claim 1, wherein a part of the second area is a specular reflection area that specularly reflects light, and the remainder of the second area is a diffuse reflection area that diffusely reflects light. The backlight unit of claim 14, wherein an area of the specular reflection area and an area of the diffuse reflection area are different from each other. The method of claim 1, wherein the upper surface of the first reflector,
A third region corresponding to the plane of the lower surface of the first reflector;
A fourth region corresponding to the inclined surface of the first reflector lower surface,
The third area and the fourth area are located on different lines. The backlight unit of claim 16, wherein the width of the third area and the width of the fourth area are different from each other. The backlight unit of claim 16, wherein a width of the third region is different from a plane width of the lower surface of the first reflector. The backlight unit of claim 16, wherein a width of the fourth region is different from a slope width of a lower surface of the first reflector. The backlight unit of claim 16, wherein the third region is a plane, the fourth region is an inclined surface, and the inclined surface of the fourth region is inclined at a second angle from a plane of the third region. The backlight unit of claim 20, wherein the inclined surface of the first reflector lower surface is inclined at a first angle from a plane of the first reflector lower surface, and the first angle is different from the second angle. The method of claim 1, wherein the second reflector includes fifth and sixth regions,
The fifth region is a first inclined surface aligned with the light source module and the first reflector and inclined downward;
The sixth region is a backlight unit adjacent to the fifth region and is a plane parallel to the plane of the lower surface of the first reflector or a second inclined surface inclined upward. The backlight unit of claim 22, wherein the inclined surface of the lower surface of the first reflector is aligned with at least one of the fifth and sixth regions of the second reflector. The backlight unit of claim 1, 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. An illumination system comprising the backlight unit according to any one of claims 1 to 24.

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