KR20130000904A - Backlight unit and display apparatus using the same - Google Patents

Abstract

PURPOSE: A backlight unit and a display device using same are provided to use a lens which covers a light source module instead of a light guide plate, thereby reducing the weight of the backlight unit. CONSTITUTION: A backlight unit includes a reflector(30), a light source module(50) and a lens(20). The light source module is arranged on the reflector. The lens covers the light source module. At least one groove(22) is formed on the lower surface of the lens. The light source module is arranged in the groove of the lower surface. [Reference numerals] (AA) 1-2 area; (BB) 1-1 area; (CC) 1-3 area; (DD) Air guide; (EE) Second area; (FF) First area; (GG) Third area

Description

Backlight unit and display apparatus using the same

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

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

Unlike 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.

Embodiments provide a backlight unit having an air guide and a display device using the same by modifying a shape of a lens covering a light source module.

Embodiments include a reflector, a light source module disposed on the reflector, and a lens covering the light source module, wherein the lens has at least one groove formed on a lower surface thereof, and the light source module may be disposed in a groove of the lower surface. have.

Here, the groove of the lens may be at least one of a V-shaped stripe having a peak point and having an inclined side surface, a cone, a triangular pyramid, a square pyramid, a polygonal pyramid, and a hemispherical shape.

The ratio of the depth of the groove to the maximum height of the lens may be 0.1-0.9: 1, and the side surface of the groove may be a concave curved surface or a plane.

Another embodiment includes a reflector, a light source module disposed on the reflector, and a lens covering the light source module, wherein the lens includes at least one first groove formed on an upper surface and at least one formed on a lower surface of the reflector. The first groove and the second groove may be disposed to correspond to each other, and the light source module may be disposed in the second groove of the lower surface.

Herein, the first and second grooves of the lens may have at least one of a V-shaped stripe having a peak point and a side slope of which is inclined, a cone, a triangular pyramid, a square pyramid, a polygonal pyramid, and a hemispherical shape.

In addition, the first groove and the second groove may be disposed to face each other at a first interval.

Subsequently, the ratio of the first gap to the maximum height of the lens may be 0.01 to 0.5: 1, and the ratio of the depth of the first groove or the second groove to the maximum height of the lens may be 0.1 to 0.5: 1.

In addition, the depth of the second groove may be deeper than the depth of the first groove, and the depth ratio of the first groove and the second groove may be 0.5-0.99: 1.

In this case, the side surface of the first groove may be a convex curved surface or a plane, and the side surface of the second groove may be a concave curved surface or a flat surface.

Another embodiment includes a reflector, a plurality of light source modules disposed on the reflector, and a plurality of lenses that cover the light source module in a one-to-one correspondence for each light source module, each lens having at least one formed on an upper surface thereof. The first groove and the at least one second groove formed on the lower surface, the first groove and the second groove may be disposed to correspond to each other, the light source module may be disposed in the second groove of the lower surface.

Here, the lenses adjacent to each other may be disposed at a first interval apart.

At least one of the side surfaces of the first and second grooves may have an uneven shape, and the lens may include polyethylene terephthalate (PET), polycarbonate (PC), and polypropylene (PP). ), Polyethylene (PE), polystyrene (PS), polyepoxy (PE), silicone, and acrylic may be any one.

The reflector may then comprise at least one inclined surface and at least one flat surface.

Next, the embodiment further includes an optical member disposed at a predetermined interval from the reflector, and an air guide may be formed in the space between the reflector and the optical member.

Embodiments can provide a backlight unit for error guide that can reduce the weight of the backlight unit, enable mass production, and provide uniform brightness by using a lens that covers the light source module instead of the light guide plate.

1 is a cross-sectional view showing a backlight unit according to an embodiment
2A and 2B show a lens according to the first embodiment
3A and 3B show a lens according to the second embodiment
4 shows a lens according to a third embodiment;
5A to 5C show a lens in which the side of the first groove is curved and the side of the second groove is planar;
6A to 6C show a lens in which side surfaces of the first and second grooves are planar;
7A to 7C illustrate a lens having curved surfaces of the first and second grooves.
8A to 8C show a lens in which the side of the first groove is flat and the side of the second groove is curved.
9-13 show various reflectors
14 illustrates a display module having a backlight unit according to an embodiment.
15 and 16 illustrate a display apparatus according to an embodiment.

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

In the description of the present embodiment, when described as being formed on the "on or under" of each element, the (top) or (bottom) ( on or under includes both that two elements are in direct contact with one another or one or more other elements are formed indirectly between the two elements.

In addition, when expressed as "on" or "under", it may include the meaning of the downward direction as well as the upward direction based on one element.

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

As shown in FIG. 1, the backlight unit may include a lens 20, a reflector 30, an optical member 40, and a light source module 50. Can be.

Here, the reflector 30 may be divided into first, second, and third regions, and the first region may be located between the second region and the third region.

The second region may be a curved surface having a first curvature R1, the third region may be a curved surface having a second curvature R2, and the second region may be a plane.

In this case, the first curvature R1 of the second region may be the same as the second curvature R2 of the third region, but may be different from each other in some cases.

In addition, the first, second, and third regions of the reflector 30 may all be planar, and the second and third regions may be inclined surfaces inclined at an angle from the first region, or the second and third regions may be inclined. The region may be a vertical plane perpendicular from the first region.

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

Next, the lens 20 may be disposed in the first region of the reflector 30, wherein at least one first groove 22 is formed in the upper surface of the lens 20, and in the lower surface of the lens 20. At least one second groove 24 may be formed.

Herein, the lens 20 may include regions 1-1, 1-2, and 1-3, wherein the region 1-1 may be located between the region 1-2 and the region 1-3. have.

The first groove 22 formed in the upper surface of the lens 20 and the second groove 24 formed in the lower surface of the lens 20 may be located in the first-first area of the lens 20.

In addition, the first and second regions of the lens 20 may be curved surfaces having a third curvature R3, and the first and third regions may be curved surfaces having a fourth curvature R4.

Here, the third curvature R3 of the 1-2 region may be the same as the fourth curvature R4 of the 1-3 region, but may be different from each other in some cases.

In addition, the third curvature R3 of the second region 1-2 may be the same as at least one of the first curvature R1 of the second region of the reflector 30 and the second curvature R2 of the third region.

The fourth curvature R4 of the first to third regions may be the same as at least one of the first curvature R1 of the second region of the reflector 30 and the second curvature R2 of the third region.

In some cases, at least one of the first to second and third regions of the lens 20 may be a plane in which a part is inclined.

Subsequently, the first grooves 22 and the second grooves 24 of the lens 20 may be disposed to correspond to each other. The first grooves 22 and the second grooves 24 may be disposed to face each other at a predetermined interval. Can be.

Here, at least one of the first groove 22 and the second groove 24 may have a stripe shape arranged in one direction.

In some cases, at least one of the first groove 22 and the second groove 24 may have a dot shape in which adjacent grooves are spaced apart from each other by a predetermined distance.

In addition, the first and second grooves 22 and 24 of the lens 20 have a peak point and have at least one of a V-shaped stripe, a cone, a triangular pyramid, a square pyramid, a polygonal pyramid, and a hemispherical shape having inclined sides. It can be either.

In addition, the lens 20 may be made of a light-transmissive material, for example, polyethylene terephthalate (PET), polycarbonate (PC), polypropylene (PP), polyethylene (PE) It may be any one selected from polystyrene (PS), polyepoxy (PE), silicone, acrylic, and the like.

Meanwhile, the light source module 50 may be disposed in the second groove 24 of the lower surface of the lens 20.

Here, the light source module 50 may include a substrate 54 and at least one light source 52 disposed on the substrate 54, wherein the substrate 54 has a stripe-shaped second groove 24. It has a stripe shape so as to be arranged along.

Subsequently, both the substrate 54 and the light source 52 may be disposed inside the second groove 24 of the lens 20, and the substrate 54 is disposed outside the second groove 24 of the lens 20. The light source 52 may be disposed inside the second groove 24 of the lens 20.

In addition, the substrate 54 of the light source module 50 may be formed with an electrode pattern for connecting the light source 52 and the adapter for supplying power.

For example, an electrode pattern for connecting the light source 52 and the adapter may be formed on the upper surface of the substrate 54.

The substrate 54 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. .

In addition, the substrate 54 may selectively use a single layer PCB, a multilayer PCB, a ceramic substrate, a metal core PCB, or the like.

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

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

As such, the light source 52 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. green) may be configured in the form of a package combining at least one or more of the LED chip, white LED chip.

Here, the white LED may be implemented by combining yellow phosphor on the blue LED, or simultaneously using red phosphor and green phosphor on the blue LED, and yellow phosphor on the blue LED. Yellow phosphor, red phosphor, and green phosphor may be simultaneously used.

Next, the optical member 40 may be disposed at a predetermined interval from the reflector 30, and an air guide is formed in the space between the reflector 30 and the optical member 40. Can be.

Here, the optical member 40 is to diffuse the light emitted through the lens 20, and may form an uneven pattern on the upper surface in order to increase the diffusion effect.

In addition, the optical member 40 may be formed of several layers, and the uneven pattern may be on the surface of the uppermost layer or any one layer.

In addition, the uneven pattern may have a stripe shape disposed along the light source module 50.

At this time, the uneven pattern has a protrusion on the surface of the optical member 40, 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 may be an obtuse angle or acute angle.

In some cases, the optical member 40 includes at least one sheet, and may 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.

As described above, in the embodiment, by disposing the lens 20 that covers the light source module 50, the light can be refracted to have wide radiation.

That is, the lens 20 may refract the light such that the light having the maximum intensity is generated within a range of about 50 to 80 degrees from the central axis of the light source 52.

2A and 2B show a lens according to the first embodiment, in which FIG. 2A is a sectional view of the lens and FIG. 2B is a perspective view of the lens.

As shown in FIGS. 2A and 2B, the lens 20 may include at least one first groove 22 formed in the upper surface and at least one second groove 24 formed in the lower surface. have.

Here, the first groove 22 and the second groove 24 may be disposed to correspond to each other, the light source module 50 may be disposed in the second groove 24 of the lower surface.

In addition, the light source module 50 may include a substrate 54 and at least one light source 52 disposed on the substrate 54, wherein the substrate 54 has a stripe-shaped second groove 24. It has a stripe shape so as to be arranged along.

At least one of the first and second grooves 22 and 24 of the lens 20 has a peak point and has a sloping V-shaped stripe, a cone, a triangular pyramid, a square pyramid, a polygonal pyramid, and a hemispherical shape. It can be either.

Here, the first groove 22 and the second groove 24 may be arranged to face each other at a first interval d1 apart.

In this case, the ratio between the first interval d1 and the maximum height d2 of the lens 20 may be about 0.01-0.5: 1.

The reason is that if the first interval d1 is too small, the refraction of the light may be reduced and wide radiation may be difficult, and if the first interval d1 is too large, the light source module 50 may be outside the second groove 24. Position to increase the thickness of the entire backlight unit.

In addition, the ratio of the depth h2 of the first groove 22 or the depth h1 of the second groove 24 and the maximum height d2 of the lens 20 may be about 0.1-0.5: 1.

In addition, the depth h1 of the second groove 22 may be deeper than the depth h2 of the first groove 22.

In this case, the ratio of the depth h2 of the first groove 22 and the depth h1 of the second groove 24 may be about 0.5-0.99: 1.

This is because the light source module 50 should be disposed in the second groove 24.

In some cases, the depth h1 of the second groove 22 may be equal to the depth h2 of the first groove 22.

Subsequently, the width w2 of the second groove 24 may be larger than the width w1 of the light source module 50.

This is because the light source module 50 should be disposed in the second groove 24.

Next, the side surface of the first groove 22 may be a convex curved surface or a plane, and the side surface of the second groove 24 may be a concave curved surface or a flat surface.

In addition, one region of the first groove 22 of the upper surface of the lens 20 may be a curved surface having a third curvature R3, and the other region of the first groove 22 may be a curved surface having a fourth curvature R4. .

Here, the third curvature R3 may be the same as the fourth curvature R4, but may be different from each other in some cases.

Here, the lens 20 may be made of a light-transmissive material, for example, polyethylene terephthalate (PET), polycarbonate (PC), polypropylene (PP), polyethylene (PE) It may be any one selected from polystyrene (PS), polyepoxy (PE), silicone, acrylic, and the like.

In some cases, at least one of the side surfaces of the first groove 22 and the second groove 24 may have an uneven shape.

Here, the concave-convex shape may increase the refraction of light to increase the wide radiation effect.

3A and 3B show a lens according to the second embodiment, in which FIG. 3A is a sectional view of the lens and FIG. 3B is a perspective view of the lens.

As shown in FIGS. 3A and 3B, at least one groove 24 is formed in the lower surface of the lens 20, and the light source module 50 including the light source 52 and the substrate 54 includes a lens ( 20) may be disposed in the groove 24 of the lower surface.

Herein, the groove 24 of the lens 20 may have at least one of a V-shaped stripe having a peak point and having an inclined side surface, a cone, a triangular pyramid, a square pyramid, a polygonal pyramid, and a hemispherical shape.

The ratio of the depth h3 of the groove 24 to the maximum height d4 of the lens 20 may be about 0.1 to 0.9: 1.

The reason for this is that if the depth of the groove 24 is too large, the refraction of light may be reduced and wide radiation may be difficult, and if the depth of the groove 24 is too small, the light source module 50 may have the groove 24. Located outside the thickness of the entire backlight unit can be increased.

In addition, the side surface of the groove 24 may be a concave curved surface or a plane, the upper surface of the lens 20 may be a convex curved surface.

In some cases, the side surface of the groove 24 may have an uneven shape.

Here, the concave-convex shape may increase the refraction of light to increase the wide radiation effect.

4 is a view showing a lens according to the third embodiment.

As shown in FIG. 4, a plurality of lenses 20 may be disposed on the reflector 30 at a predetermined interval.

At least one first groove 22 may be formed on an upper surface of each lens 20, and at least one second groove 24 may be formed on a lower surface of each lens 20.

Here, the first grooves 22 formed on the upper surface of each lens 20 may be disposed to face each other in a one-to-one correspondence to the second grooves 24 formed on the lower surface of the lens 20.

In this case, the first groove 22 may be a cone shape having a peak point, but in some cases, the first groove 22 may have a V-shaped stripe having a slanted side surface, a triangular pyramid, a square pyramid, and a polygonal pyramid. At least one of, and hemispherical shape may be sufficient.

In addition, the side surface of the first groove 22 may be a convex curved surface or may be flat.

The second groove 24 may have a square pyramid shape having a peak point, but in some cases, at least one of a V-shaped stripe, a cone, a triangular pyramid, a polygonal pyramid shape, and a hemispherical shape having an inclined side surface. It may be.

Here, the side surface of the second groove 24 may be a concave curved surface or may be flat.

As such, the reason why the first grooves 22 and the second grooves 24 are formed in the upper and lower portions of the lens 20 is that light generated by the light source 52 is refracted by the lens 20 to provide wide light distribution. wide radiation is possible, and the wide radiation light can be reflected by the inclined surface of the reflector 30 and uniformly diffused.

The light source module 50 may be disposed in the second groove 24 of the lower surface of the lens 20.

Here, the light source module 50 may include a substrate 54 and at least one light source 52 disposed on the substrate 54, wherein the substrate 54 may be disposed correspondingly in the second groove 24. Can be.

That is, one substrate 54 may be disposed in one second groove 24, and at least one light source 52 may be disposed on one substrate 54.

In some cases, a plurality of substrates 54 may be disposed in one second groove 24, and at least one light source 52 may be disposed on one substrate 54.

In addition, both the substrate 54 and the light source 52 may be disposed inside the second groove 24 of the lens 20, and the substrate 54 may be disposed outside the second groove 24 of the lens 20. The light source 52 may be disposed inside the second groove 24 of the lens 20.

As such, the plurality of lenses 20 may be spaced apart from each other, and correspond to each light source module 50 one-to-one to cover the light source module 50.

Here, at least one of the side surfaces of the first groove 22 and the second groove 24 may have an uneven shape.

5A to 5C illustrate a lens in which the side of the first groove is curved and the side of the second groove is flat.

FIG. 5A illustrates a first groove 22 formed in the first-first area of the upper surface of the lens 20 having a curved surface in which the side surface 22b is convex. 20a may also have a convex curved shape.

The second groove 24 formed in the region 1-1 of the lower surface of the lens 20 has a flat planar side surface 24b, and the surfaces of the regions 1-2 and 1-3 are also shown. It may have a flat planar shape.

Subsequently, in FIG. 5B, the first groove 22 formed in the first-first area of the upper surface of the lens 20 has a curved surface in which the side surface 22b is convex. Surface 20a may have a flat planar shape.

The second grooves 24 formed in the region 1-1 of the lower surface of the lens 20 have a flat side surface, and the surfaces of the first, second and third regions are also flat. Can have

Next, FIG. 5C illustrates that the first groove 22 formed in the first-first area of the upper surface of the lens 20 has a curved surface in which the side surface 22b is convex. Surface 20a may have a flat planar shape.

The second groove 24 formed in the region 1-1 of the lower surface of the lens 20 has a flat planar side surface 24b, and the surfaces of the regions 1-2 and 1-3 are also shown. It may have a flat planar shape.

Here, a part of the surface 20a of the first, second, and third regions of the upper surface of the lens 20 may be parallel to the surface of the first, second, and third regions of the lower surface of the lens 20. Can be.

6A to 6C are views illustrating a lens in which side surfaces of the first and second grooves are planar.

FIG. 6A shows that the first groove 22 formed in the region 1-1 of the upper surface of the lens 20 has a planar shape with a flat side surface 22b. 20a may also have a convex curved shape.

The second groove 24 formed in the region 1-1 of the lower surface of the lens 20 has a flat planar side surface 24b, and the surfaces of the regions 1-2 and 1-3 are also shown. It may have a flat planar shape.

6B, the first groove 22 formed in the first-first area of the upper surface of the lens 20 has a flat planar side surface 22b, and the first-first and second-first areas. Surface 20a may also have a flat planar shape.

The second grooves 24 formed in the region 1-1 of the lower surface of the lens 20 have a flat side surface, and the surfaces of the first, second and third regions are also flat. Can have

Next, FIG. 6C shows that the first groove 22 formed in the region 1-1 of the upper surface of the lens 20 has a flat planar side surface 22b, and the regions 1-2 and 1-3. The surface of may also have a flat planar shape.

The second groove 24 formed in the region 1-1 of the lower surface of the lens 20 has a flat planar side surface 24b, and the surfaces of the regions 1-2 and 1-3 are also shown. It may have a flat planar shape.

Here, a part of the surface 20a of the first, second, and third regions of the upper surface of the lens 20 may be parallel to the surface of the first, second, and third regions of the lower surface of the lens 20. Can be.

7A to 7C are views illustrating a lens having curved surfaces of side surfaces of the first and second grooves.

FIG. 7A illustrates that the first groove 22 formed in the first-first area of the upper surface of the lens 20 has a curved surface in which the side surface 22b is convex. 20a may also have a convex curved shape.

The second groove 24 formed in the 1-1 region of the lower surface of the lens 20 has a curved surface having a concave side surface 24b, and the surfaces of the 1-2 and 1-3 regions are It may have a flat planar shape.

Subsequently, in FIG. 7B, the first groove 22 formed in the first-first area of the upper surface of the lens 20 has a curved surface having a convex side surface 22b. Surface 20a may have a flat planar shape.

The second groove 24 formed in the region 1-1 of the lower surface of the lens 20 has a curved surface having a concave side surface, and the surfaces of the regions 1-2 and 1-3 are also flat. Can have

Next, FIG. 7C illustrates that the first groove 22 formed in the first-first area of the upper surface of the lens 20 has a curved surface having a convex side surface 22b. Surface 20a may have a flat planar shape.

The second groove 24 formed in the 1-1 region of the lower surface of the lens 20 has a curved surface having a concave side surface 24b, and the surfaces of the 1-2 and 1-3 regions are It may have a flat planar shape.

Here, a part of the surface 20a of the first, second, and third regions of the upper surface of the lens 20 may be parallel to the surface of the first, second, and third regions of the lower surface of the lens 20. Can be.

8A to 8C show a lens in which the side of the first groove is flat and the side of the second groove is curved.

FIG. 8A shows that the first groove 22 formed in the region 1-1 of the upper surface of the lens 20 has a planar shape with a flat side surface 22b, and the surface of the regions 1-2 and 1-3. 20a may have a convex curved shape.

The second groove 24 formed in the 1-1 region of the lower surface of the lens 20 has a curved surface having a concave side surface 24b, and the surfaces of the 1-2 and 1-3 regions are It may have a flat planar shape.

Subsequently, in FIG. 8B, the first groove 22 formed in the region 1-1 of the upper surface of the lens 20 has a flat planar side surface 22b, and the regions 1-2 and 1-3. Surface 20a may also have a flat planar shape.

The second groove 24 formed in the region 1-1 of the lower surface of the lens 20 has a curved surface having a concave side surface, and the surfaces of the regions 1-2 and 1-3 are also flat. Can have

Next, FIG. 8C illustrates that the first groove 22 formed in the first-first area of the upper surface of the lens 20 has a flat planar side surface 22b. Surface 20a may also have a flat planar shape.

The second groove 24 formed in the 1-1 region of the lower surface of the lens 20 has a curved shape in which the side surface 24b is concave. It may have a flat planar shape.

Here, a part of the surface 20a of the first, second, and third regions of the upper surface of the lens 20 may be parallel to the surface of the first, second, and third regions of the lower surface of the lens 20. Can be.

9 to 13 show various reflectors.

First, as shown in FIG. 9, the reflector 30 may be formed on a bottom chassis 70.

Here, the central area of the bottom chassis 70 may be a flat plane, and the edge area may have a concave curved surface.

The reflector 30 may be disposed on the bottom chassis 70 having such a surface structure, and the lens 20 and the light source module 50 may be disposed on the central region of the reflector.

Here, the reflector 30 may have a flat plane, and the edge region may have a concave curved surface, like the surface structure of the bottom chassis 70.

In addition, the reflector 30 may include a metal or metal oxide having a high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ ), or the like.

In addition, the reflector 30 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 50 in the direction of the optical member.

Subsequently, as shown in FIG. 10, the center region of the bottom chassis 70 may be a flat plane, and the edge region may have an inclined surface that is inclined at an angle.

Here, the inclined surface may be a flat plane.

In addition, the reflector 30 may be disposed on the bottom chassis 70 having the surface structure, and the lens and the light source module 50 may be disposed on the central region of the reflector.

Thus, the reflector 30 may have a flat plane and the edge area may have a flat inclined plane, as in the surface structure of the bottom chassis 70.

Next, as shown in FIG. 11, the side of the bottom chassis 70 may be vertically bent from the bottom surface of the bottom chassis 70, and the bottom surface and the side surface of the bottom chassis 70 may be flat.

In addition, the central region of the reflector 30 disposed on the bottom chassis 70 may be a flat plane, and the edge region may have a concave curved surface.

Here, the thickness of the reflector 30 may gradually increase from the central area to the edge area.

In addition, the lens 20 and the light source module 50 may be disposed on the central region of the reflector having the surface structure.

As such, the surface structure of the reflector 30 and the surface structure of the bottom chassis 70 may be different from each other.

12, the side of the bottom chassis 70 may be vertically bent from the bottom surface of the bottom chassis 70, and the bottom surface and the side surface of the bottom chassis 70 may be flat.

The reflector 30 may be disposed on the bottom chassis 70 having such a surface structure, and the lens 20 and the light source module 50 may be disposed on the central region of the reflector.

Here, the reflector 30 may have a flat surface with a bottom surface and a side surface, like the surface structure of the bottom chassis 70.

At this time, the thickness of the reflector 30 may be the same from the bottom surface of the bottom chassis 70 to the side.

Therefore, the surface structure of the reflector 30 and the surface structure of the bottom chassis 70 may be the same.

Subsequently, as shown in FIG. 13, the bottom chassis 70 may include a support part 70b for supporting the reflector 30 and a fixing part 70a for fixing the support part 70b.

Here, the support part 70b may be made of a polymer resin such as plastic capable of injection molding, and the fixing part 70a may be made of a metal material.

In addition, the support part 70b may have a flat planar center region, and an edge region may have a concave curved surface.

Here, the thickness of the support part 70b may gradually increase from the central area to the edge area.

In addition, the reflector 30 may be formed on the support part 70b having such a surface structure, and the lens 20 and the light source module 50 may be disposed on the central region of the reflector 30.

In this case, the reflector 30 may be formed of any one of a reflective coating film and a reflective coating material layer, and serve to reflect light generated from the light source module 50 in the direction of the optical member.

Here, the reflective coating film and the reflective coating material layer may include at least one of a metal or a metal oxide, for example, aluminum (Al), silver (Ag), gold (Au) or titanium dioxide (TiO ₂ ) and It may be configured to include a metal or metal oxide having a high reflectance.

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

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

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

The color filter substrate 91 includes a plurality of pixels including red (R), green (G), and blue (B) sub-pixels, and generates an image corresponding to the color of red, green, or blue when light is applied. You can.

The pixels may be composed of red, green, and blue subpixels, but the red, green, blue, and white (W) subpixels constitute one pixel, but are not necessarily limited thereto.

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

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

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

As a result, the light provided from the backlight unit 100 may be incident on the color filter substrate 91 in response to the change in the molecular arrangement of the liquid crystal layer.

In addition, an upper polarizer 93 and a lower polarizer 94 may be disposed above and below the display panel 90, and more specifically, an upper polarizer 93 may be disposed on an upper surface of the color filter substrate 91. The lower polarizer 94 may be disposed on the bottom surface of the TFT substrate 92.

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

As illustrated in FIG. 14, the display module 200 may be configured by closely placing the backlight unit 100 on the display panel 90.

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

As such, by forming the backlight unit 100 in close contact with the display panel 90, the overall thickness of the display device may be reduced to improve appearance, and an additional structure for fixing the backlight unit 100 may be removed. The structure and manufacturing process of the display device can be simplified.

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

15 and 16 illustrate a display device according to an embodiment.

First, as shown in FIG. 15, the display apparatus 1 is provided in the display module 200, the front cover 300, the back cover 350, and the back cover 350 surrounding the display module 200. It may be composed of a driving unit 550 and a driving unit cover 400 surrounding the driving unit 550.

The front cover 300 may include a front panel (not shown) of a transparent material that transmits light, and the front panel protects the display module 200 at regular intervals, and the light emitted from the display module 200. The light is transmitted through the display module 200 so that the image displayed on the display module 200 is viewed from the outside.

In addition, the front cover 300 may be made of a flat plate without the window 300a.

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

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

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

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

The driver 550 may include a drive controller 550a, a main board 550b, and a power supply unit 550c.

The driving control unit 550a may be a timing controller. The driving control unit 550a may be a driving unit for adjusting an operation timing of each driver IC of the display module 200. And a driving unit for transmitting G and B resolution signals, and the power supply unit 550c may be a driving unit for applying power to the display module 200.

The driver 550 may be provided in the back cover 350 and may be wrapped by the driver cover 400.

A plurality of holes may be provided in the back cover 350 to connect the display module 200 and the driver 550, and a stand 600 supporting the display apparatus 1 may be provided.

Subsequently, as shown in FIG. 16, the driving controller 550a of the driving unit 550 may be provided in the back cover 350, and the main board 550b and the power board 550c may be provided in the stand 600. have.

In addition, the driver cover 400 may wrap only the driver 550 provided in the back cover 350.

In an embodiment, the main board 550b and the power board 550c are separately configured, but may be formed as one integrated board, but the present invention is not limited thereto.

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.

Claims (19)

Reflector;
A light source module disposed on the reflector; And,
A lens covering the light source module,
The lens has at least one groove formed on the lower surface,
The light source module is disposed in the groove of the lower surface. The backlight unit of claim 1, wherein the groove of the lens is at least one of a V-shaped stripe, a cone, a triangular pyramid, a square pyramid, a polygonal pyramid, and a hemispherical shape having a peak point and having an inclined side surface. The backlight unit of claim 1, wherein a ratio between the depth of the groove and the maximum height of the lens is 0.1 to 0.9: 1. The backlight unit of claim 1, wherein a side surface of the groove is a concave curved surface or a flat surface. The backlight unit of claim 1, wherein an upper surface of the lens is a convex curved surface. Reflector;
A light source module disposed on the reflector; And,
A lens covering the light source module,
The lens,
At least one first groove formed on the upper surface,
At least one second groove formed in the lower surface,
The first groove and the second groove are disposed to correspond to each other,
The light source module is disposed in the second groove of the lower surface. 7. The lens of claim 6, wherein the first and second grooves of the lens are at least one of a V-shaped stripe, a cone, a triangular pyramid, a square pyramid, a polygonal pyramid, and a hemispherical shape having a peak point and inclined sides. Backlight unit. The backlight unit of claim 6, wherein the first groove and the second groove are disposed to face each other at a first interval. The backlight unit of claim 6, wherein a ratio between the first interval and the maximum height of the lens is 0.01 to 0.5: 1. The backlight unit of claim 6, wherein a ratio of the depth of the first groove or the second groove to the maximum height of the lens is 0.1 to 0.5: 1. The backlight unit of claim 6, wherein a depth of the second groove is deeper than a depth of the first groove. The backlight unit of claim 6, wherein a depth ratio of the first groove to the second groove is 0.5 to 0.99: 1. The backlight unit of claim 6, wherein a side surface of the first groove is a convex curved surface or a plane, and a side surface of the second groove is a concave curved surface or a flat surface. Reflector;
A plurality of light source modules disposed on the reflector; And,
One to one corresponding to each light source module, and includes a plurality of lenses covering the light source module,
Each lens is
At least one first groove formed on the upper surface,
At least one second groove formed in the lower surface,
The first groove and the second groove are disposed to correspond to each other,
The light source module is disposed in the second groove of the lower surface. The backlight unit of claim 14, wherein the adjacent lenses are spaced apart from each other at a first interval. The method of claim 1, wherein the lens comprises polyethylene terephthalate (PET), polycarbonate (PC), polypropylene (PP), polyethylene (Polyethylene). : PE), polystyrene (PS), polyepoxy (PE), silicone, acrylic, any one of the backlight unit. 15. The backlight unit of claim 1, 6 or 14, wherein the reflector comprises at least one inclined surface and at least one flat surface. The method according to any one of claims 1, 6 and 14,
Further comprising an optical member disposed at a predetermined interval from the reflector (optical member),
And an air guide formed in a space between the reflector and the optical member. Display panel;
It includes a backlight unit for irradiating light to the display panel,
Display device using the backlight unit is any one of the backlight unit of claim 1 wherein the backlight unit.

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