KR101782082B1 - Display apparatus - Google Patents

Abstract

A second reflector, at least one light source disposed between the first and second reflectors, and a second reflector having at least two inflection points each having at least one inflection point, A first distance value between a first horizontal line connecting the inflection point and a second horizontal line connecting a point on the first inclined plane end in the first and second inclined surfaces including the inclined plane and adjacent to the inflection point, May be equal to or greater than a second distance value between the horizontal line and a third horizontal line connecting a point on the end of the second slope surface.

Description

[0001]

An embodiment relates to a display device.

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

Unlike a self-luminous PDP, a backlight unit is indispensable because of the absence of its own light emitting device.

The backlight unit used in the LCD is divided into an edge type backlight unit and a direct-type backlight unit according to the position of the light source. In the edge type, a light source is disposed on the right and left sides or upper and lower sides of the LCD panel, Since the light is uniformly distributed over the surface, uniformity of light is good and the thickness of the panel can be made very thin.

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

CCFL (Cold Cathode Fluorescent Lamp) is used as a light source of the backlight unit of the conventional edge method or direct-down type.

However, since the backlight unit using CCFL is always supplied with power to the CCFL, a considerable amount of power is consumed, and a color reproduction ratio of about 70% as compared with CRT and environmental pollution problems caused by the addition of mercury are pointed out as disadvantages.

BACKGROUND ART [0002] As a substitute product for solving the above problem, researches on a backlight unit using an LED (Light Emitting Diode) have been actively conducted.

When the LED is used as a backlight unit, it is possible to partially turn on / off the LED array, thereby drastically reducing the power consumption. In the case of the RGB LED, the color reproduction range specification exceeding 100% of the National Television System Committee (NTSC) So that a more vivid image quality can be provided to the consumer.

In addition, the LED manufactured by the semiconductor process is characterized by being harmless to the environment.

Currently, LCD products employing LEDs having the above advantages are being marketed extensively. However, since the conventional CCFL light source is different from the driving mechanism, driving drivers and PCB substrates are expensive.

Therefore, the LED backlight unit is only applied to expensive LCD products.

An embodiment of the present invention is to provide a display device having an air guide that can be light-weighted and mass-produced by using a reflector having slopes having different curvature radii.

An embodiment includes at least two light sources having a first reflector, a second reflector, at least one light source disposed between the first and second reflectors, and a second reflector including at least two inclined surfaces having at least one inflection point, The first distance value between the first horizontal line connecting the inflection points and the second horizontal line connecting one point of the first inclined plane ends is equal to the distance between the first horizontal line connecting the inflection point and the first horizontal line connecting the inflection point May be equal to or greater than the second distance value between the third horizontal line connecting the points.

Here, the ratio of the first distance value to the second distance value may be 1: 0.01 - 1.

Then, the third distance value between the first vertical line connecting the inflection point and the second vertical line connecting the one end of the first inclined surface is the distance between the first vertical line connecting the inflection point and the third vertical line connecting one point of the second inclined surface end 4 < / RTI > distance value.

Here, the ratio of the third distance value to the fourth distance value may be 1: 1 - 20.

Next, the inflection point between the first and second inclined surfaces of the second reflector may be formed in the second reflector region adjacent to the light source.

The first inclined surface is adjacent to the light source, and the curvature radius of the first inclined surface may be smaller than the curvature radius of the second inclined surface.

Here, the ratio of the radius of curvature of the first inclined surface to the radius of curvature of the second inclined surface may be 1: 1 - 10.

The fifth distance value between the first horizontal line connecting the inflection point and the fourth horizontal line connecting the one point of the light source is the second distance value between the first horizontal line connecting the inflection point and the third horizontal line connecting the one end of the second slope surface Lt; / RTI >

The center region of the second reflector may have a convex curved shape.

Embodiments can provide a light weight, mass production, and uniform brightness by simply constructing a reflector suitable for an air guide by using a reflector having inclined surfaces with different radii of curvature.

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

Figs. 1A and 1C are views for explaining a backlight unit of a two-edge type according to the embodiment
2 is a view showing the difference in radius of curvature between the first inclined surface and the second inclined surface of the second reflector
3A and 3B are views showing the cover plate and the panel support in detail;
4 is a view showing the first segment of FIG. 3B in detail;
Figs. 5A to 5D are views showing the upper surface of the first projection in Fig. 4
6A to 6C are views showing a configuration in which the panel supporting portion is fastened to the cover plate
7A to 7C are views showing the positions of the heat dissipation units
8 is a view showing a cross section of a heat radiating projection line
9A and 9B are views showing the shape of the heat radiation projection line
10 is a view showing a groove formed in the heat radiating projection line region
11 is a view showing a position of a heat dissipation unit applied to a backlight unit of a two-edge system
12A to 12D are views showing a bottom cover including a second reflector
13A to 13C are views showing a cover plate including a radiating protrusion line and a first reflector
14A to 14C are diagrams showing a panel guide including a panel supporting portion
15A to 15C are diagrams showing a backlight unit to which a bottom cover, a cover plate, and a panel guide are coupled
16 is a view showing a circuit device disposed at the bottom of the bottom cover
17 is a view showing a display module having a backlight unit according to an embodiment
18 and 19 are views showing a display device according to an embodiment

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

In the description of the present embodiment, in the case of being described as being formed "on or under" of each element, the upper (upper) or lower (lower) on or under includes both the two elements being directly in contact with each other or one or more other elements being indirectly formed between the two elements.

Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

FIGS. 1A and 1C are diagrams for explaining a two-edge type backlight unit according to an embodiment, wherein FIG. 1A is a top perspective view, FIG. 1B is a bottom perspective view, and FIG.

1A to 1C, the backlight unit may include a light source module 100, a first reflector 200, and a second reflector 300 including at least one light source.

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

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

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

The light source module 100 may include a circuit board having an electrode pattern and a light emitting device for generating light.

At this time, at least one light emitting element may be mounted on the circuit board, and an electrode pattern for connecting the adapter supplying the power and the light emitting element may be formed.

For example, a carbon nanotube electrode pattern for connecting the light emitting device and the adapter may be formed on the upper surface of the circuit board.

Such a circuit board may be a PCB (Printed Circuit Board) substrate made of polyethylene terephthalate (PET), glass, polycarbonate (PC), silicon (Si) or the like and mounted with a plurality of light sources 100, .

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

The light emitting diode may be a blue LED chip or an ultraviolet LED chip or a red LED chip, a green LED chip, a blue LED chip, a yellow green LED, Chip, white LED chip, or the like.

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

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

Here, the first reflector 200 has an open area, and may be disposed on one side of the light source module 100 or spaced apart at regular intervals.

That is, the first reflector 200 may include a first light source module and a second light source module, which are disposed such that the central region thereof is open and the light source module 100 faces the opposite side edge regions of the first reflector 200 have.

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

In addition, a sawtooth-shaped reflection pattern may be formed on the surface of the first reflector 200 facing the light emitting module 100, and the surface of the reflection pattern may be flat or curved.

The reason why the reflection pattern is formed on the surface of the first reflector 200 is to increase the brightness in the central region of the backlight unit by reflecting the light generated by the light emitting module to the central region of the second reflector 300.

The second reflector 300 may be disposed at a predetermined distance from the light source module 100 and may have an inclined surface inclined at an angle from a horizontal plane parallel to the surface of the first reflector 200.

The inclined surface of the second reflector 300 may reflect the light generated from the light source module 100 or the light reflected from the first reflector 200 to the open region of the first reflector 200 .

Further, the second reflector 300 may include at least two inclined surfaces having at least one inflection point.

2 is a view showing the curvature difference between the first inclined surface and the second inclined surface of the second reflector.

As shown in Fig. 2, the curvature radii R1 and R2 of the first and second slopes 301 and 303 adjacent to each other around the inflection point P may be different from each other.

The inflection point P between the first and second inclined surfaces 301 and 303 may be located in the area of the second reflector 300 adjacent to the light source, but may be located in an area far from the light source.

If the curvature radius R1 of the first inclined plane 301 adjacent to the light source is smaller than the curvature radius R2 of the second inclined plane 303, the inflection point P will be located in the second reflector 300 region adjacent to the light source, The inflection point P will be located in the second reflector 300 region far from the light source if the curvature radius R1 of the first inclined plane 301 adjacent to the second inclined plane 303 is larger than the curvature radius R2 of the second inclined plane 303. [

The curvature radius R1 of the first inclined surface 301 is smaller than the curvature radius R2 of the second inclined surface 303 and the maximum height H1 of the first inclined surface 301 is smaller than the curvature radius R2 of the second inclined surface 303 The distance L2 between the inflection point P and the end of the second inclined surface 303 is smaller than the maximum height H2 and the distance L1 between the inflection point P and the end of the first inclined surface 301 is smaller.

The arrangement relationship between the light source module 100 and the first and second reflectors 200 and 300 will be described in more detail as follows.

The first inclined surface 301 is adjacent to the light source module 100 and the curvature radius R1 of the first inclined surface 301 may be smaller than the curvature radius R2 of the second inclined surface 303 .

In some cases, the curvature radius R1 of the first inclined surface 301 may be equal to the curvature radius R2 of the second inclined surface 303. [

Here, the ratio of the curvature radius R1 of the first inclined surface 301 to the curvature radius R2 of the second inclined surface 303 may be 1: 1-10.

The distance D1 between the first horizontal line connecting the inflection point P and the second horizontal line connecting one point of the first sloping surface 301 corresponds to the distance between the first horizontal line connecting the inflection point P and one point of the second sloping surface 303 Can be larger than the distance value D2 between the third horizontal lines.

The distance D1 between the first horizontal line connecting the inflection point P and the second horizontal line connecting one point of the first sloping surface 301 and the second horizontal line connecting the inflection point P is equal to the distance between the first horizontal line connecting the inflection point P and one end of the second sloping surface 303 May be equal to the distance value D2 between the third horizontal line connecting the points.

Here, the ratio of the first distance value D1 to the second distance value D2 may be 1: 0.01 - 1.

A third distance D3 between a first vertical line connecting the inflection point P and a second vertical line connecting a point on the end of the first inclined surface 301 corresponds to a distance between a first vertical line connecting the inflection point P and one May be smaller than the fourth distance value D4 between the third vertical lines connecting the points.

A third distance D3 between a first vertical line connecting the inflection point P and a second vertical line connecting a point on the end of the first slope 301 is determined by a first vertical line connecting the inflection point P, May be the same as the fourth distance value D4 between the third vertical lines connecting a point of the first vertical line.

Here, the ratio of the third distance value D3 to the fourth distance value D4 may be 1: 1 - 20.

A fifth distance D5 between a first horizontal line connecting the inflection point P and a fourth horizontal line connecting a point of the light source module 100 corresponds to a point between the first horizontal line connecting the inflection point P and the end of the second slope 303 May be smaller than the second distance value D2 between the third horizontal lines.

Next, the first reflector 200 includes a first end adjacent to the light source module 100 and a second end facing the first end, and a distance D7 between the first end and the second end is about 3 - 30 mm.

The sixth distance D6 between the first vertical line connecting the inflection point P and the fourth vertical line connecting the second end of the first reflector 200 is a distance between the first end and the second end of the first reflector 200 May be greater than the value D7.

1C, the second inclined surface 303 of the second reflector 300 is formed to be symmetrical with respect to the central region of the second reflector 300, and the second inclined surface 303 of the second reflector 300 is symmetric with respect to the central region of the second reflector 300, May have a convex curved surface shape.

In some cases, the central area of the second reflector 300 may have a flat plane or a concave curved shape.

That is, the central area of the second reflector 300 may be a flat plane, a convex curved surface, or a concave curved surface, or may include a plurality of shapes.

Further, the optical member 400 may be supported by the first reflector 200, and may be arranged to face the second reflector 200.

Here, the optical member 400 is formed of at least one sheet, and may optionally include a diffusion sheet, a prism sheet, a brightness enhancement sheet, and the like.

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

The surface of the optical member 400 may have a concavo-convex shape for uniform diffusion of light.

Next, the cover plate 500 can be brought into contact with the first reflector 200 and the second reflector 300 and fixed to each other.

The panel support part 600 covers a part of the cover plate 500 and can be fixedly disposed on the cover plate 500. [

3A and 3B are views showing the cover plate and the panel support in detail.

As shown in FIGS. 3A and 3B, the cover plate 500 may be composed of first, second, and third segments 510, 530, and 550.

The first segment 510 may have a first surface on which the first reflector 200 is attached and a plurality of first protrusions 511 on the second surface facing the first surface.

The second segment 530 extends from the first segment 510 and has a second protrusion 531 adjacent to the light source module 100 and a coupling groove 533 on a surface facing the second protrusion 531. [ Lt; / RTI >

The third segment 550 may extend from the second segment 530 and may be fixed to one side of the second reflector 300 and may have a third projection 551.

Here, the optical member 400 may be supported by any one of the first projections 511 of the first segment 510, and may be disposed to face the second reflector 300.

The panel support part 600 covers a part of the cover plate 500 and can be fixed to the cover plate 500. [

The panel support 600 includes a fourth protrusion 610 and a fifth protrusion 630 that are inserted between the first protrusions 511 of the first segment 510 And the fifth protrusion 630 can be inserted into the engagement groove 533 of the second segment 530. [

Here, the number of the fourth protrusions 610 inserted between the first protrusions 511 of the first segment 510 may be one or more.

Next, a plurality of first protrusions 511 of the first segment 510 may be formed.

FIG. 4 is a detailed view of the first segment of FIG. 3b.

As shown in FIG. 4, the first segment 510 may include a first protruding line 511a and a second protruding line 511b.

At least one first protrusion line 511a may be disposed in the edge region of the first segment 510.

At least two second projecting lines 511b may be disposed apart from the first projecting lines 511a.

Here, the height of the first projecting line 511a may be lower than that of the second projecting line 511b.

This is because the first projecting line 511a serves to support the optical member 400 and the second projecting line 511b adjacent thereto serves to stably fix the optical member 400 to be.

In addition, the upper surface of the first protrusion 511 of the first segment 510 may be planar or curved.

Figures 5a-d are top views of the first protrusion of Figure 4;

As shown in Fig. 5A, the upper surface of the first projection 511 may be planar, and the upper surface of the first projection 511 may be curved, as shown in Fig. 5B.

Since the first projection 511 needs to support the optical member 400, it may be a curved surface capable of reducing the contact area with the optical member 400 possible.

In some cases, to further reduce the contact area with the optical member 400, a buffer groove 520 may be further formed on the upper surface of the first projection 511 as shown in FIG. 5C.

The buffer groove 520 may be formed on the upper surface of the first protrusion 511 as shown in FIG. 5C, but may be formed as shown in FIG. 5D.

The second segment 530 of the cover plate 500 is formed with a second protrusion 531. The second protrusion 531 is disposed around the light source module 100 to support the light source module 100 Can be fixed.

A thermal pad 110 may be disposed on at least one of the second segment 530 and the light source module 100 and between the second projection 531 and the light source module 100.

The thermal pad 110 may support the light source module 100 to the second segment 530 and may transmit the heat generated from the light source module 100 to the second segment 530.

The third segment 550 of the cover plate 500 may then include a third projection 551.

The third protrusion 551 may include a protrusion 551a and a connection portion 551b and may be fixed to the fixing portion 310 of the second reflector 300. [

The protrusion 551a of the third protrusion 551 protrudes in the first direction and the connection 551b extends from the protrusion 551a and is bent in a direction perpendicular to the first direction, And can be fixed to the fixing portion 310.

The third segment 550 may include a plurality of heat radiating protrusion lines 553.

As shown in FIGS. 3A and 3B, the plurality of heat radiating protrusion lines 553 are spaced apart from the third protrusions 551 and may radiate heat generated from the light source module 100 .

In addition, the second reflector 300 may include a fixing portion 310 for fixing the third segment 550 of the cover plate 500.

The fixing portion 310 of the second reflector 300 protrudes from the lower surface of the second reflector 300 and may include a protruding body 310a and a fixed body 310b.

The protruding body 310a of the fixing part 310 protrudes in the first direction and the fixed body 310b extends from the protruding body 310a and is bent in the second direction perpendicular to the first direction, The third protrusion 551 of the third segment 550 of the first and second segments 500 and 500 may be fixed.

The fixed body 310b of the fixing part 310 may further extend to cover the entire third projection 551 of the third segment 550. [

6A to 6C are views showing a configuration in which the panel supporting portion is fastened to the cover plate.

6A is a cross-sectional view showing a state in which the panel supporting portion is fastened to the cover plate, FIG. 6B is a view in which the panel supporting portion and the cover plate are located in a region where the light source module is disposed, And the cover plate is engaged with the panel supporting portion.

6A to 6C, the panel support 600 may be arranged to cover the first segment 510 and a portion of the second segment 530 of the cover plate 500. As shown in FIGS.

The panel support 600 includes a fourth protrusion 610 and a fifth protrusion 630 that are inserted between the first protrusions 511 of the first segment 510 and the fourth protrusion 610, 5 protrusion 630 can be inserted into the engaging groove 533 of the second segment 530. [

The cover plate 500 supports the light source module 100 and functions as a heat dissipation unit that is in contact with the first reflector 200 and the second reflector 300 to emit heat generated in the light source module 100 can do.

Here, the heat dissipation unit may include a plurality of heat dissipation projections 553. The heat dissipation unit may include a region contacting the first reflector 200, a region contacting the second reflector 300, a region contacting the light source module 100, Or the like.

Here, each of the heat radiation projecting lines 553 includes first and second surfaces facing each other, and the area of the first surface may be a trapezoid shape narrower than the second surface.

Here, the second surface of the heat radiating protrusion line 553 may be disposed closer to the light source module 100 than the first surface of the heat radiating protrusion line 553.

This is because the heat generated in the light source module 100 can be transmitted as fast as possible by increasing the contact area with the light source module 100.

7A to 7C are views showing the positions of the heat dissipation units.

As shown in Fig. 7A, the heat radiating protrusion lines 553 may be arranged in a region of the cover plate 500 which is in contact with the second reflector 300. Fig.

7B, the heat radiating protrusion lines 553 may be arranged in a region of the cover plate 500 which is in contact with the light source module 100, and as shown in FIG. 7C, The first reflector 553 may be arranged in a region of the cover plate 500 which is in contact with the first reflector 200. [

8 is a cross-sectional view of a heat radiating protrusion line.

8, the area S1 of the first surface contacting the cover plate 500 and the area S2 of the second surface facing the first surface may be equal to or different from each other, The area S1 of the first surface of each heat radiating protrusion line 553 may be larger than the area S2 of the second surface facing the first surface.

This is because heat generated in the light source module 100 can be transmitted as soon as possible.

In some cases, at least one of the plurality of heat radiation projecting lines 553 may have different thicknesses, heights, and the like.

9A and 9B are views showing the shape of the heat radiating protrusion line.

The heat radiating protrusion line 553a disposed in the area adjacent to the light source module 100 out of the plurality of heat radiating protrusion lines 553a, 553b, 553c, and 553d is located away from the light source module 100 May be thicker than the radiating protrusion line 553a disposed in the region.

9B, the heat radiating protrusion line 553a disposed in a region adjacent to the light source module 100 out of the plurality of heat radiating protrusion lines 553a, 553b, 553c, and 553d is formed in the light source module 100, The height of the heat radiating protrusion line 553a may be higher than that of the heat radiating protrusion line 553a.

The reason why the heat radiating protrusion line 553 is disposed is that the temperature of the heat is closer to the light source module 100 and thus the surface area of the heat radiating protrusion line 553 disposed in the higher temperature region is widened, Because it is possible to release it.

The area of the cover plate 550 which is in contact with the light source module 100 is thicker than the thickness of the area contacting the second reflector 300 in order to further enhance the effect of emitting heat generated from the light source module 100 .

In addition, a thermal pad may be disposed between the light source module 100 and the cover plate 500.

Next, the cover plate 500, which is in contact with the second reflector 300, may have the same curved surface as the lower surface shape of the second reflector 300.

10, a plurality of grooves 555 are formed in an area where the cover plate 500 is in contact with the second reflector 300. The grooves 555 are formed on the respective heat radiating protrusions 553, As shown in FIG.

The protrusions of the second reflector 300 may be inserted into the grooves 555.

That is, the second reflector 300 includes a plurality of protrusions on the lower surface. The protrusions are inserted into the grooves 555 of the cover plate 500, and correspond to the grooves 555, Can be arranged.

The groove 555 is formed in correspondence with the radiating protrusion line 553 in order to strengthen the fastening with the second reflector 300 and to increase the heat radiation area of the radiating protrusion line 553.

The heat dissipation unit of the present embodiment can be disposed in a plurality of areas. When a plurality of light source modules are provided like the 2-edge type backlight unit, the positions of the heat dissipation units can be symmetrically applied to the same position. However, , And the position of the heat dissipation part may be applied to different positions.

11 is a view showing a position of a heat dissipation unit applied to a backlight unit of a two-edge type.

As shown in FIG. 11, the two first reflectors 200a and 200b are spaced apart from each other in the first direction so as to face each other, and the second reflector 300 is spaced apart from the two first reflectors 200a and 200b And a second direction perpendicular to the first direction.

The first light source module 100a may be disposed between the first and second reflectors 200a and 300 and the second light source module 100b may be disposed between the first and second reflectors 200b and 300. [ connect.

The first cover plate 500a as a first heat dissipating unit supports the first light source module 100a and can be in contact with the first reflector 200a and the second reflector 300. [

Next, the plurality of first heat radiating projecting lines 553a are arranged in a region that is in contact with the first reflector 200a, a region in contact with the second reflector 300, and a region in contact with the first light source module 100a So that heat generated in the first light source module 100a can be emitted.

The second cover plate 500b serving as the second radiation part supports the second light source module 100b and can be in contact with the first reflector 200b and the second reflector 300. [

Next, the plurality of second radiating / projecting lines 553b may be arranged in at least one of a region in contact with the first reflector 200b, a region in contact with the second reflector 300, and a region in contact with the second light source module 100b And emit heat generated in the second light source module 100b.

The first and second radiating protrusion lines 553a and 553b may be arranged in different areas so as not to be symmetrical, as shown in FIG.

However, in an economical design, the first and second heat radiating and projecting lines 553a and 553b may be arranged in the same area so as to be symmetrical to each other.

As described above, the backlight unit of the present embodiment is a structure in which a bottom cover including a second reflector, a cover plate including a heat radiating protrusion line and a first reflector, and a panel guide including a panel support are combined.

FIGS. 12A to 12D are views showing a bottom cover including a second reflector, FIGS. 13A to 13C are views showing a cover plate including a radiating protrusion line and a first reflector, FIGS. 14A to 14C are cross- FIGS. 15A to 15C are views showing a backlight unit to which a bottom cover, a cover plate, and a panel guide are coupled. FIG.

12A to 12D, the bottom cover including the second reflector 300 may be made of a polymer resin such as plastic to enable injection molding.

The bottom cover includes at least two inclined surfaces having at least one inflection point and the curvatures of the first and second inclined surfaces adjacent to each other around the inflection point are made different from each other.

In addition, a plurality of reinforcing ribs 350 may be disposed on the lower surface of the second reflector 300 in the bottom cover.

The reason for this is that the second reflector 300 has a reflective surface having a curved surface, so that the second reflector 300 may be deformed by external environmental conditions, and therefore, a reinforcing rib 350 may be provided to prevent this.

The reinforcing rib 350 may be disposed not only on the rear surface facing the inclined surface of the second reflector 300 but also on the rear surface facing the side surface of the second reflector 300. [

In addition, the bottom cover may be formed with support pins 360 for supporting the optical member on the upper surface of the second reflector 300.

This is because the optical member is separated from the second reflector 300 and the air guide is formed therebetween, so that the central region of the optical member can be lowered.

Here, it is stable that the area of the lower surface of the support pin 360 contacting the second reflector 300 is larger than the area of the upper surface.

Next, as shown in Figs. 13A to 13C, the cover plate 500 includes a first segment in contact with the first reflector, a second segment in contact with the light source module, and a third segment in contact with the second reflector .

In the third segment, heat radiating protrusion lines 553 for emitting heat of the light source module may be formed.

The cover plate 500 supports the optical member using protrusions formed on the first segment and is coupled to the panel guide as the panel support using the projections and the engagement grooves of the second segment, 2 can be fastened to the fixing part of the reflector.

Here, the cover plate 500 may be made of a material different from the bottom cover including the second reflector.

That is, the cover plate 500 may be made of metal, and the bottom cover including the second reflector may be a polymer resin.

14A to 14C, the panel guide including the panel support 600 may include a protrusion that is fastened to the first segment of the cover plate and a protrusion that is fastened to the second segment of the cover plate .

Here, the hook-shaped fifth projections 630 may be respectively arranged in the panel guide area corresponding to the engagement groove of the second segment of the cover plate.

As shown in Figs. 15A to 15C, a mold bottom cover including a second reflector manufactured respectively, a cover plate including a heat radiating protrusion line and a first reflector, and a panel guide including a panel support And the optical member 400 is fastened to the cover plate, the backlight unit can be completed.

Then, when the display panel is fastened to the panel guide of the backlight unit, the display device can be left open.

16 is a view showing a circuit device disposed under the bottom cover.

As shown in FIG. 16, circuit devices 370 for driving the light source module may be disposed below the slopes of the second reflector 300.

Since a predetermined space is formed between the inclined surfaces on the rear surface of the second reflector 300, if the circuit devices are arranged in the space, the empty space can be efficiently used.

The backlight unit described so far can be an embodiment, and can be modified into various shapes.

The first and second reflectors 200 and 300 may have a flat surface or an inclined surface, and the inclined surface may be a flat surface or a curved surface.

The inclined surface having a curved surface may be a concave inclined surface or a convex inclined surface.

Accordingly, the second reflector 300 is not parallel to the first reflector 200, and may be at least one of a flat surface, a flat inclined surface, a concave inclined surface, and a convex inclined surface.

The second reflector 300 may have a structure in which a reflective film is attached to a mold body having an inclined surface or a structure in which a reflective film having an inclined surface is attached to a mold body having a plane, It may be a mold body structure.

Here, the reflective film may include at least one of a metal or a metal oxide, and may be a metal having a high reflectance such as aluminum (Al), silver (Ag), gold (Ag), or titanium dioxide (TiO ₂ ) Or a metal oxide.

The reflection patterns of the first reflector 200 and the second reflector 300 may be different from each other.

That is, the first reflector 200 may have a reflecting surface regularly reflecting light, and the second reflector 300 may have a reflecting surface that diffusely reflects light.

Alternatively, the first reflector 200 may have a reflecting surface that diffusely reflects light, and the second reflector 300 may have a reflecting surface that regularly reflects light.

On the other hand, in this embodiment, the light exit surface of the light source module 100 may be arranged in various directions.

That is, the light source module 100 may have a direct emitting type structure in which the light exit surface is disposed so as to face the air guide direction between the optical member 400 and the second reflecting surface 300, The light guide plate 100 may be an indirect exit type structure in which the light exit surface is arranged to face either the first reflector 200, the second reflector 300, or the cover plate 500.

Here, in the indirect emission type light source module 100, the emitted light is reflected by the first reflector 200, the second reflector 300 and the cover plate 500, and the reflected light is reflected again in the air guide direction of the backlight unit You can move on.

The reason why the light source module 100 is disposed in the indirect output structure is that hot spot phenomenon can be reduced.

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

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

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

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

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

18 and 19 are views showing a display device according to an embodiment.

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

The front cover 30 may include a transparent front panel (not shown) that transmits light. The front panel protects the display module 20 at regular intervals, and the 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.

19, the driving control unit 55a of the driving unit 55 is provided in the back cover 35, and the main board 55b and the power board 55c may be provided in the stand 60 have.

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

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

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

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

Claims (18)

A first reflector;
A second reflector;
At least one light source disposed between the first reflector and the second reflector; And
And a heat dissipating unit for supporting the light source and contacting the at least one of the light source, the first reflector, and the second reflector to emit heat generated in the light source,
Wherein the second reflector includes at least two inclined surfaces having at least one inflection point, the first inclined surface adjacent to the inflection point,
A first distance value between a first horizontal line connecting the inflection point and a second horizontal line connecting a point of the first slope surface is a distance between a first horizontal line connecting the inflection point and a third horizontal line connecting a point of the second slope surface Is equal to or greater than the second distance value of < RTI ID = 0.0 >
The heat-
At least one of a first region contacting the first reflector, a second region extending from the first region and contacting the light source, and a third region extending from the second region and contacting the second reflector And a plurality of protruding heat radiating protrusion lines,
Wherein each of the plurality of heat radiating protrusion lines includes a first surface and a second surface facing each other,
Wherein the second surface is disposed closer to the light source than the first surface,
Wherein an area of the first surface has a trapezoidal shape narrower than the second surface,
Wherein at least one of the plurality of heat radiating projection lines has a different thickness or height. 2. The display device of claim 1, wherein the ratio of the first distance value to the second distance value is 1: 0.01 - 1. 3. The apparatus of claim 2, wherein a third distance value between a first vertical line connecting the inflection point and a second vertical line connecting a point of the first slope surface is determined by a first vertical line connecting the inflection point and a second vertical line connecting a point Is equal to or smaller than the fourth distance value between the third vertical lines connecting the first and second vertical lines,
Wherein the ratio of the third distance value to the fourth distance value is 1: 1 - 20. delete 4. The reflector according to any one of claims 1 to 3, wherein an inflection point between the first inclined surface and the second inclined surface of the second reflector is formed in the second reflector region adjacent to the light source,
Wherein a ratio of a radius of curvature of the first inclined surface to a radius of curvature of the second inclined surface is 1: 1 to 10. 6. The light-emitting device according to claim 5, wherein the first inclined surface is adjacent to the light source, the curvature radius of the first inclined surface is smaller than the curvature radius of the second inclined surface,
A fifth distance value between a first horizontal line connecting the inflection point and a fourth horizontal line connecting a point of the light source is a second distance value between a first horizontal line connecting the inflection point and a third horizontal line connecting a point of the second slope surface, Larger than the distance value,
Wherein the light source is in contact with at least one of the first reflector and the second reflector,
The light source is spaced a first distance from the first reflector, a second distance from the second reflector,
Wherein the central region of the second reflector has a convex curved shape. delete delete delete delete delete delete 4. The method according to any one of claims 1 to 3,
A cover plate that supports the light source and contacts the first reflector and the second reflector; And
Further comprising an optical member arranged to face the second reflector,
The cover plate
A first segment having a first surface on which the first reflector is attached and a first surface on the fourth surface facing the third surface,
Wherein the optical member is supported by one of the first projections of the first segment. delete delete 14. The lighting apparatus according to claim 13, wherein the second reflector and the cover plate are made of different materials,
And a panel support portion that covers a part of the cover plate and is fixed to the cover plate.
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