KR101827971B1 - backlight unit and display apparatus using the same - Google Patents

Abstract

The present invention relates to a backlight unit and a display device using the backlight unit. The backlight unit includes a first reflector, a second reflector including a slope having at least one inflection point, the second reflector having a pattern in which concave lines and convex lines are arranged along the slope, And at least one light source disposed between the first and second reflectors.

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 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 is to provide a backlight unit having an air guide and a display device using the same, by using a reflector in which a plurality of patterns in which concave lines and convex lines are alternately arranged are formed.

An embodiment includes a first reflector, a second reflector including a slope having at least one inflection point, the second reflector having a pattern in which concave lines and convex lines are alternately arranged along the slope, And at least one light source disposed between the reflectors.

Here, the concave line of the second reflector may be a curved surface concave from the inclined surface, and the convex line of the second reflector may be convex curved surface from the inclined surface.

The curvature of the concave line can satisfy the angle? Between the straight line connecting the contact point between the concave line and the inclined plane and the peak point of the concave line and the inclined plane is 0.01 to 15 degrees.

At this time, the angle? Can be defined by the following equation (1).

Equation 1

θ = tan ^-1 (h / w) = 0.01 to 15 degrees

Here, h is the maximum depth of the concave line (the shortest distance between the apex of the concave line and the inclined plane), w is the width of the concave line (the contact point between the concave line and the inclined plane, (The shortest distance between the vertical lines connecting the two sides).

Next, the curvatures of the concave lines and the convex lines adjacent to each other are equal to each other, or the curvatures of the concave lines and the convex lines adjacent to each other may be different from each other.

Next, the first convex line and the second convex line are disposed on both sides of one concave line, and the curvature of the first convex line is the same as the curvature of the adjacent concave line and may be different from the curvature of the second convex line.

The first convex line and the second convex line are disposed on both sides of one concave line, and the curvature of the first convex line is different from the curvature of the adjacent concave line and may be different from the curvature of the second convex line.

The first concave line and the second concave line are disposed on both sides of one convex line, and the curvature of the first concave line is the same as the curvature of the adjacent convex line and may be different from the curvature of the second concave line.

The first concave line and the second concave line are disposed on both sides of one convex line, and the curvature of the first concave line is different from the curvature of the adjacent convex line and may be different from the curvature of the second concave line.

Next, the lengths of the concave lines and the convex lines may be longer in the area adjacent to the light source than the area farther from the light source, or the lengths of the concave and convex lines may become longer and shorter And the lengths of the concave lines and the convex lines may be the same as the areas distant from the light source and adjacent to the light source.

The embodiments can form a plurality of patterns in which the concave lines and the convex lines are alternately arranged on the surface of the reflector suitable for the air guide, so that the weight is light, the manufacturing cost is low, and the uniform brightness can be provided.

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

Figs. 1A and 1B are views for explaining a backlight unit according to an embodiment
Fig. 2 is a view showing details of the concave and convex lines of Fig. 1
Fig. 3 is a view for explaining conditions for determining the curvature of the concave or convex line in Fig. 1
Figures 4 and 5A-5D illustrate various embodiments of curvature relationships between concave and convex lines
6A and 6B are views showing a second reflector of one edge type
7A and 7B are views showing a second reflector of a two edge type
Figs. 8 and 9 are views showing a second reflector of four edge type
10A to 10C are views showing the inclined surface of the second reflector
11 is a view for explaining the positional relationship between the first reflector and the second reflector
12 is a view showing another embodiment of the second reflector
13 is a view showing a backlight unit including an optical member
14 is a view showing an example of the shape of the optical member
15 is a view showing a reinforcing rib formed on the lower surface of the second reflector
16 is a view showing a support pin formed on the upper surface of the second reflector
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 the present 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.

1A and 1B are views for explaining a backlight unit according to an embodiment, wherein FIG. 1A is a sectional view and FIG. 1B is a top perspective view.

1A and 1B, the backlight unit may include a light source module 100 including at least one light source 110, a first reflector 200, and a second reflector 300 have.

The light source module 100 including the light source 110 is disposed between the first reflector 200 and the second reflector 300 and disposed 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.

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 source module 100, and the surface of the reflection pattern may be flat or curved.

The reason for forming the reflection pattern 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 source module to the central region of the second reflector 300.

Next, the second reflector 300 includes a slope 310 having at least one inflection point P0, and along the slope 310, a plurality of concave lines 312 and convex lines 314 alternately arranged in one direction Pattern.

Here, the concave line 312 of the second reflector 300 may be a concave curved surface from the inclined surface 310, and the convex line 314 of the second reflector 300 may be a convex curved surface from the inclined surface 310.

The inclined plane 310 of the second reflector 300 may be an inclined plane inclined at a predetermined angle from a horizontal plane parallel to the surface of the first reflector 200.

For example, the second reflector 300 may include at least two inclined surfaces 310 having at least one inflection point P0, as shown in FIGS. 1A and 1B, A first inclined surface 310a having a curvature R1 and a second inclined surface 310b having a second curvature R2.

That is, the curvatures R1 and R2 of the first and second inclined surfaces 310a and 310b adjacent to each other around the inflection point P0 may be different from each other in the second reflector 300. [

The curvature R1 of the first inclined surface 310a disposed adjacent to the light source module 100 may be greater than the curvature R2 of the second inclined surface 310b disposed adjacent to the first inclined surface 310a.

The concave line 312 and the convex line 314 of the second reflector 300 may be alternately arranged in one direction along the first and second inclined surfaces 310a and 310b.

The concave line 312 having a concave curved surface and the convex line 314 having a convex curved surface can be arranged in the same direction as the direction in which the light sources of the light source module 100 are arranged.

Here, the concave line 312 and the convex line 314 may include a first concave line 312a and a first convex line 314a arranged along the first inclined plane 310a, and the second inclined plane 310b A second concave line 312b and a second convex line 314b arranged along the first convex line 314b.

At this time, the first concave line 312a and the first convex line 314a arranged along the first inclined surface 310a may have a first curvature r1 and a second curvature r2, respectively.

The second concave line 312b and the second convex line 314b arranged along the second inclined surface 310b may have a third curvature r3 and a fourth curvature r4, respectively.

The first curvature r1, the second curvature r2, the third curvature r3 and the fourth curvature r4 may all be the same, but in some cases, at least one may be different.

For example, the first curvature r1 and the second curvature r2 of the first concave line 312a and the first convex line 314a arranged along the first inclined plane 310a are arranged along the second inclined plane 310b The third curvature r3 and the fourth curvature r4 of the second concave line 312b and the second convex line 314b may be the same or may be different from each other.

Here, when the curvature R1 of the first inclined surface 310a of the second reflector 300 is made larger than the curvature R2 of the second inclined surface 310b, the first concave line 312a arranged along the first inclined surface 310a And the first curvature r1 and the second curvature r2 of the first convex line 314a are equal to the second curvature r3 of the second concave line 312b and the second convex line 314b arranged along the second inclined surface 310b, And the fourth curvature r4.

The reason is that the first concave line 312a and the first convex line 314a arranged along the first inclined surface 310a move away from the central area of the second reflector 300, So that uniform brightness can be provided.

FIG. 2 is a view showing details of the concave and convex lines of FIG. 1. FIG.

The concave line 312 and the convex line 314 of the second reflector 300 may be alternately arranged along the inclined surface 310 of the second reflector 300 as shown in FIG.

Here, the concave line 312 may have a concave curved surface from the inclined surface 310 so as to have the first curvature r1.

That is, the concave line 312 is a curved surface passing through the concave line 312 and the contact point P2 between the concave line 312 and the inclined plane 310 and the peak point P3 of the concave line. The width W1 of the concave line 312, Lt; / RTI > is the distance between two straight lines that are perpendicular to line 310 and beyond contact P2.

The convex line 314 may have a convex curved surface from the inclined surface 310 so as to have the second curvature r2.

That is, the convex line 314 is a curved surface passing through the contact point P2 between the convex line 314 and the sloped surface 310 and the peak point P1 of the convex line, and the width W2 of the convex line 314, Lt; / RTI > is the distance between two straight lines that are perpendicular to line 310 and beyond contact P2.

Thus, the curvature of the concave line and the convex line to be formed can be determined by a predetermined equation.

Fig. 3 is a diagram for explaining conditions for determining the curvature of the concave line or the convex line in Fig. 1. Fig.

3, the curvature r1 of the concave line 312 is set to a value between the contact point P2 of the concave line 312 and the inclined plane 310 and the peak point P3 of the concave line 312 And the angle? Between the connecting line and the inclined surface 310 is about 0.01 to 15 degrees.

The angle &thetas; can be defined by the following equation (1).

Equation 1

θ = tan ^-1 (h / w) = 0.01 to 15 degrees

Here, h is the maximum depth of the concave line 312, which means the shortest distance between the apex P3 of the concave line 312 and the sloped surface 310.

W is the width of the concave line 312 and means the shortest distance between the contact point P2 of the concave line 312 and the inclined plane 310 and the vertical line connecting the vertex P3 and the inclined plane 310 of the concave line 312 do.

That is, the above equation (1) can be obtained by the following equation.

3, when the distance of the straight line connecting the vertex P3 of the concave line 312 from the center point O of the imaginary circle 400 passing through the surface of the concave line 312 is R,

(R - h) ^ 2 + w ^ 2 = R ^ 2

h = R +/- sqrt (R ^ 2 - w ^ 2)

Therefore, a straight line connecting between the contact point P2 of the concave line 312 and the slope face 310 and the peak point P3 of the concave line 312 by the conditions of R, w, , And the inclined plane 310 is tan ^-1 (h / w), and may be about 0.01 to 15 degrees.

The reason why the recessed line is formed with the curvature having the condition of the angle? Is that when the light enters the recessed line, the shadow effect does not appear due to the curved surface of the recessed line, ) Is not displayed, so that a backlight unit having uniform brightness can be manufactured.

Also, in the case of the convex line, the same condition as the concave line can be established so that the shadow phenomenon does not appear.

That is, if a concave line or a convex line is formed so as to have a curvature including the condition of the angle?, It is possible to manufacture a backlight unit having an overall uniform luminance.

Here, the concave line having the curvature r1 may serve to collect light, and the convex line having the curvature r2 may serve to disperse the light.

The curvature of the concave line 312, the curvature of the convex line 314, the width of the concave line 312, the convex line 314, It is possible to manufacture an air guide type backlight unit having uniform brightness.

Figs. 4 and 5A to 5D show various examples showing the curvature relationship between the concave line and the convex line. Fig. 4 shows an example in which the concave line and the convex line have the same curvature, Figs. 5A to 5D show the concave line and convex line, The curvature of the line is another embodiment.

4, the concave line 312 and the convex line 314 may be alternately arranged along the inclined surface 310 of the second reflector 300. In this case,

Here, the concave line 312 has a curved surface concave downward from the inclined surface 310 and may have a curvature r1.

That is, the concave line 312 is a curved surface passing through the contact point P2 of the inclined surface 310 and the peak point P3 of the concave line.

The width W1 of the concave line 312 is a distance between two straight lines that are perpendicular to the sloped surface 310 and pass the contact point P2 and the maximum depth h1 of the concave line 312 is the minimum distance between the vertex P3 and the sloped surface 310 It is a street.

The convex line 314 has a curved surface convex upward from the inclined surface 310 and may have a curvature r2.

That is, the convex line 314 is a curved surface passing through the contact point P2 of the inclined surface 310 and the peak point P1 of the convex line.

The width W2 of the convex line 314 is a distance between two straight lines that are perpendicular to the sloped surface 310 and pass the contact point P2 and the maximum height h2 of the convex line 314 is a minimum distance between the vertex P1 and the sloped surface 310 It is a street.

Accordingly, in the embodiment, as shown in Fig. 4, the curvature r1 of the concave line 312 and the curvature r2 of the convex line 314 adjacent to each other may be equal to each other.

The width W1 of the concave line 312 and the width W2 of the convex line 314 are equal to each other and the maximum depth h1 of the concave line 312 and the maximum height h2 of the convex line 314 may be equal to each other.

However, in some cases, the curvature r1 of the concave lines 312 adjacent to each other and the curvature r2 of the convex lines 314 may be different from each other.

5A to 5D are various embodiments in which the curvature of the concave line 312 and the convex line 314 which are adjacent to each other are different from each other.

5A shows an embodiment in which the concave line 312 has a curvature equal to the curvature of the first convex line 314a disposed on one side and a curvature different from the curvature of the second convex line 314b disposed on the other side 5B is an embodiment in which the concave line 312 has a curvature different from the curvature of the first convex line 314a disposed on one side and the second convex line 314b disposed on the other side.

5C, the convex line 314 has a curvature equal to the curvature of the first concave line 312a disposed on one side and a curvature different from the curvature of the second concave line 312b disposed on the other side. 5D is an example in which the convex line 314 has a curvature different from the curvature of the first concave line 312a disposed on one side and the curvature of the second concave line 312b disposed on the other side.

 5A, a first convex line 314a and a second convex line 314b are disposed on both sides of one concave line 312, and a curvature r2a of the first convex line 314a is a concave line, May be the same as the curvature r1 of the line 312 and may be different from the curvature r2b of the second convex line 314b.

The width W1 of the concave line 312 is equal to the width W2a of the first convex line 314a and may be different from the width W2b of the second convex line 314b.

The maximum depth h1 of the concave line 312 is equal to the maximum height h2a of the first convex line 314a and may be different from the maximum height h2b of the second convex line 314b.

5B, the first convex line 314a and the second convex line 314b are disposed on both sides of one concave line 312, and the curvature r2a of the first convex line 314a is adjacent May be different from the curvature r1 of the concave line 312 and may be different from the curvature r2b of the second convex line 314b.

The width W1 of the concave line 312 may be different from the width W2a of the first convex line 314a and may be different from the width W2b of the second convex line 314b.

The maximum depth h1 of the concave line 312 may be different from the maximum height h2a of the first convex line 314a and may be different from the maximum height h2b of the second convex line 314b.

5C, the first concave line 312a and the second concave line 312b are disposed on both sides of one convex line 314 and the curvature r1a of the first concave line 312a is adjacent Which is the same as the curvature r2 of the convex line 314 and is different from the curvature r1b of the second concave line 312b.

The width W2 of the convex line 314 is equal to the width W1a of the first concave line 312a and may be different from the width W1b of the second concave line 312b.

The maximum height h2 of the convex line 314 is equal to the maximum depth h1a of the first concave line 312a and may be different from the maximum depth h1b of the second concave line 312b.

5D, the first concave line 312a and the second concave line 312b are disposed on both sides of one convex line 314, and the curvature r1a of the first concave line 312a is adjacent May be different from the curvature r2 of the convex line 314 and may be different from the curvature r1b of the second concave line 312b.

The width W2 of the convex line 314 may be different from the width W1a of the first concave line 312a and may be different from the width W1b of the second concave line 312b.

The maximum height h2 of the convex line 314 may be different from the maximum depth h1a of the first concave line 312a and may be different from the maximum height h1b of the second concave line 312b.

As described above, the second reflector having a plurality of patterns in which the concave lines and the convex lines are alternately arranged can be manufactured in various shapes according to the arrangement of the light source modules.

FIGS. 6A and 6B are diagrams showing a second reflector of one edge type, FIGS. 7A and 7B are views showing a second reflector of a two edge type, and FIGS. 9 is a view showing a second reflector of a four edge type.

FIG. 6A is a plan view showing a second reflector of one edge type, and FIG. 6B is a sectional view of FIG. 6A.

6A and 6B, the first edge type second reflector 300 has a light source module 100 disposed on one side, and the concave line 312 and the convex line 314 are disposed on the second reflector 300 As shown in FIG.

Here, the inclined surface of the second reflector 300 has one inflection point and may have a first inclined surface and a second inclined surface with respect to the inflection point.

The first inclined surface may be an inclined surface disposed adjacent to the light source module 100, and may be positioned between the light source module 100 and the second inclined surface.

At this time, the curvature of the concave line and the convex line arranged along the first inclined plane may be the same as the curvature of the concave line and the convex line arranged along the second inclined plane, but depending on the case, The curvature of the line and the convex line may be different from that of the concave line and the convex line arranged along the second inclined plane.

Here, both the concave line and the convex line arranged on the first inclined plane and the second inclined plane may have the same length.

7A is a plan view showing a second edge type second reflector, and Fig. 7B is a cross section of Fig. 7A.

7A and 7B, the two-edge type second reflector 300 includes the light source module 100 disposed on both sides thereof, and the concave line 312 and the convex line 314 are disposed on both sides of the second reflector 300 As shown in FIG.

Here, the inclined surface of the second reflector 300 may include a plurality of inclined surfaces having at least two inflection points.

The inclined surfaces may be formed symmetrically with respect to the inflection point, and the curvatures of the concave lines and the convex lines arranged along the respective inclined surfaces may be the same, but depending on the case, the concave lines and the convex lines arranged along at least one inclined surface The curvature of the lines may be different from the curvature of the concave and convex lines arranged along the remaining inclined surfaces.

Here, the concave lines and the convex lines arranged on each inclined plane may have the same length.

Next, FIG. 8 is a plan view showing a second reflector of a four edge type.

8, the four-edge type second reflector 300 includes four light source modules 100 disposed on four sides and a concave line 312 and a convex line 314 disposed on the four sides of the second reflector 300 They can be alternately arranged along the inclined plane.

Here, the inclined surface of the second reflector 300 may be formed corresponding to the light source module 100 disposed on each side surface.

In other words, the inclined surface of the second reflector 300 may include a first inclined surface corresponding to the light source module 100 disposed on the first side, a second inclined surface corresponding to the light source module 100 disposed on the second side facing the first side, A third inclined surface corresponding to the light source module 100 disposed on the third side surface, and a fourth inclined surface corresponding to the light source module 100 disposed on the fourth side facing the third side surface.

The first, second, third, and fourth slopes may include two slopes having one inflection point.

At this time, the width of each inclined plane may gradually decrease from the light source module 100 toward the central area of the second reflector, and the length of the concave line and the convex line arranged along each inclined plane may be shorter than the distance from the light source module 100 The area adjacent to the light source module 100 may be longer.

The curvatures of the concave lines and the convex lines arranged along the respective inclined planes may be equal to each other, but depending on the case, the curvature of the concave line and the convex line arranged along at least one inclined plane may be the concave line And the curvature of the convex line.

Next, FIG. 9 is a plan view showing a second reflector of a four edge type.

9, the fourth edge type second reflector 300 has the light source module 100 disposed in four corner areas, and the concave line 312 and the convex line 314 are disposed in the second reflector 300, As shown in FIG.

Here, the inclined surface of the second reflector 300 may be formed corresponding to the light source module 100 disposed in each corner area.

In other words, the inclined surface of the second reflector 300 is divided into a first inclined surface corresponding to the light source module 100 disposed in the first corner area, a second inclined surface corresponding to the light source module 100 disposed in the second corner area facing the first corner area, A third inclined surface corresponding to the light source module 100 arranged in the third corner area, and a fourth inclined surface corresponding to the light source module 100 disposed in the fourth corner area facing the third corner area, . ≪ / RTI >

The first, second, third, and fourth slopes may include two slopes having one inflection point.

At this time, the width of each inclined plane gradually increases and decreases from the light source module 100 to the central area of the second reflector, and the lengths of the concave lines and the convex lines arranged along the respective inclined planes, The distance from the light source module 100 to the area farther from the light source module 100 may become longer and shorter.

The curvatures of the concave lines and the convex lines arranged along the respective inclined planes may be equal to each other, but depending on the case, the curvature of the concave line and the convex line arranged along at least one inclined plane may be the concave line And the curvature of the convex line.

As described above, the concave line and the convex line of the second reflector may vary depending on the shape of the inclined surface depending on the position of the light source module, but may vary depending on the surface shape of the inclined surface of the second reflector, as the case may be.

Figs. 10A to 10C are views showing an inclined plane of the second reflector. Fig. 10A is an embodiment in which the inclined plane is a plan view, and Figs. 10B and 10C are embodiments in which the inclined plane is a curved plane.

The inclined plane 310 of the second reflector 300 is planar and the concave line 312 and the convex line 314 can be alternately arranged side by side along the inclined plane 310 which is plane have.

10B, the inclined surface 310 of the second reflector 300 may be a concave curved surface, and the concave line 312 and the convex line 314 may be curved along the inclined surface 310, which is a concave curved surface, They can be arranged alternately side by side.

10C, the inclined surface 310 of the second reflector 300 may be a convex curved surface, and the concave line 312 and the convex line 314 may be curved along the inclined surface 310, which is a convex curved surface, They can be arranged alternately side by side.

As described above, the inclined surface 310 of the second reflector 300 may have a pattern in which the inclination angle of at least a part of the reflector 300 increases and then decreases. However, when the inclination angle of at least a part of the second reflector 300 increases, .

As such, the inclined surface 310 of the second reflector 300 may be at least one of a concave surface, a convex surface, and a flat surface.

On the other hand, the inclined surface of the second reflector may vary in the area of the inclined surface depending on the position of the first reflector.

11 is a view for explaining the positional relationship between the first reflector and the second reflector.

11, in the structure in which the light source module 100 is disposed between the first reflector 200 and the second reflector 300, the second reflector 300 has a curvature R1 with respect to the inflection point P0 And a second inclined surface having a first inclined surface and a curvature R2.

Here, the first inclined surface may be an inclined surface disposed adjacent to the light source module 100, and may be positioned between the light source module 100 and the second inclined surface.

The first reflector 200 is positioned between the first inclined surface of the second reflector 300 and the second inclined surface of the second reflector 300. The first inclined surface is located between the vertical line passing through the inflection point P0 and perpendicular to the inclined surface, May be arranged to overlap.

That is, the length of the first reflector 200 can be adjusted so that the waterline L1 passing through the end 210 of the first reflector and the slope of the second reflector 300 can be located within the distance D1.

The reason for this is to uniformly reflect the brightness of the light and to maximize the light emitting area of the backlight.

The concave line and the convex line may be alternately arranged along the first inclined plane having the curvature R1 and the second inclined plane having the curvature R2.

In this manner, the inclined surface of the second reflector 300 may include first and second inclined surfaces, the first inclined surface may be disposed adjacent to the light source module 100, and the first inclined surface and the second inclined surface may And can be continuously arranged in contact with each other.

The curvature R1 of the first inclined surface may be larger than the curvature R2 of the second inclined surface, and the first inclined surface may overlap with the first reflector 200. [

In some cases, the first inclined surface and the second inclined surface are spaced apart from each other by a predetermined distance, and the surface between the first inclined surface and the second inclined surface may be a plane parallel to the first reflector 200. [

12 is a view showing another embodiment of the second reflector.

12, the second reflector 300 may include a first inclined surface having a curvature R1 and a second inclined surface having a curvature R2, and the first inclined surface and the second inclined surface may be spaced apart from each other by a predetermined distance .

Here, the surface between the first inclined surface and the second inclined surface may be a horizontal surface parallel to the surface of the first reflector.

In this case, the width of the horizontal plane may be a distance D2 between the end point EP1 of the first inclined surface having the curvature R1 and the end EP2 of the second inclined surface.

The width of the first inclined surface having the curvature R1 is a distance D1 from the light source module 100 to the end EP1 of the first inclined surface, and the width of the second inclined surface having the curvature R2 is from the one end EP2 of the second inclined surface to the second And the distance D3 to the other end of the inclined plane.

Here, the width D1 of the horizontal plane is smaller than the width D2 of the first inclined plane having the curvature R1 and the width D3 of the second inclined plane having the curvature R2, the width D2 of the first inclined plane having the curvature R1 is larger than the width D1 of the horizontal plane, R2 may be smaller than the width D3 of the second inclined surface.

In some cases, a horizontal plane parallel to the surface of the first reflector may be formed not only between the first inclined plane and the second inclined plane, but also between the light source module 100 and the first inclined plane, or on some surface of the second inclined plane have.

The concave line and the convex line may be alternately arranged along the first inclined plane having the curvature R1 and the second inclined plane having the curvature R2 or alternately along the horizontal plane.

Meanwhile, the backlight unit according to 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 a space between the second reflector and the optical member have.

FIG. 13 is a view showing a backlight unit including an optical member, and FIG. 14 is a view showing an example of the shape of an optical member.

As shown in Fig. 13, the optical member 600 is disposed in the open region of the first reflector 200, and may have a concave-convex pattern 620 on the upper surface thereof.

Here, the optical member 600 is for diffusing light emitted through the open region of the first reflector 200, and forms an uneven pattern 620 on the upper surface of the diffusion sheet 600 to increase the diffusion effect can do.

The irregular pattern 620 may have a strip shape arranged along the light source module 100, as shown in FIG.

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

Optionally, the optical member 600 is made of at least one sheet, and may optionally include a diffusion sheet, a prism sheet, a brightness enhancement sheet, and the like.

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

As described above, in the backlight unit, a plurality of patterns are formed so that the concave lines and the convex lines are alternately arranged on the surface of the second reflector, thereby improving the brightness and providing uniform brightness.

The second reflector of the present embodiment may be 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.

In some cases, the second reflector can be made of a polymer resin such as a plastic or the like to enable injection molding.

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 second reflector having a pattern of concave lines and convex lines may have a reflecting surface regularly reflecting light, and may have a reflecting surface that reflects light irregularly.

Optionally, the second reflector may have the same reflectance as the entire surface, and some surfaces may have different reflectivities.

Also, the first reflector may be formed with a plurality of patterns in which the concave line and the convex line are alternately arranged, as in the second reflector, and reflection patterns different from the pattern of the second reflector may be formed.

The first reflector may have a reflecting surface regularly reflecting the light, and the second reflector may have a reflecting surface diffusely reflecting the light.

Alternatively, the first reflector may have a reflecting surface that diffusely reflects light, and the second reflector 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 may be arranged in various directions.

That is, the light source module 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 and the second reflector, and the light source module has a light exit surface, 2 reflector and the cover plate direction so as to face each other.

Here, in the indirect emission type light source module, the emitted light is reflected on the first reflector, the second reflector, and the cover plate, and the reflected light can again travel in the air guide direction of the backlight unit.

The reason why the light source module is disposed in the indirect output structure is that it can reduce the hot spot phenomenon.

Further, a plurality of reinforcing ribs may be disposed on the lower surface of the second reflector.

FIG. 15 is a view showing a reinforcing rib formed on the lower surface of the second reflector. As shown in FIG. 15, a plurality of reinforcing ribs 350 may be disposed on the lower surface of the second reflector.

The reason is that the second reflector has a reflecting surface having a curved surface, so that it can be deformed by external environmental conditions, so that a reinforcing rib 350 can 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 but also on the rear surface facing the side surface of the second reflector.

Further, support pins for supporting the optical member may be formed on the upper surface of the second reflector.

16 is a view showing a support pin formed on the upper surface of the second reflector. As shown in FIG. 16, support pins 360 for supporting the optical member may be formed on the upper surface of the second reflector 300 have.

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.

On the other hand, circuit devices for driving the light source module may be disposed below the inclined surface of the second reflector.

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

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 color filter substrate 810 includes a plurality of pixels composed of red (R), green (G), and blue (B) subpixels and generates images corresponding to red, green, .

The pixels may be composed of red, green, and blue subpixels, but the red, green, blue, and white (W) subpixels constitute one pixel.

The TFT substrate 820 can switch a pixel electrode (not shown) as an element in which switching elements are formed.

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

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

Thereby, the light provided from the backlight unit 700 can be incident on the color filter substrate 810 in accordance with the change of the molecular arrangement of the liquid crystal layer.

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, 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.

As shown in FIG. 17, the display module may be configured by placing a backlight unit 700 closely on the display panel 800. [

For example, the backlight unit 700 may be adhered and fixed to the lower surface of the display panel 800, more specifically, the lower polarizer plate 840, and between the lower polarizer plate 840 and the backlight unit 700 An adhesive layer (not shown) may be formed.

By forming the backlight unit 700 in close contact with the display panel 800 as described above, it is possible to improve the appearance by reducing the overall thickness of the display device, and the additional structure for fixing the backlight unit 700 can be removed So that the structure and manufacturing process of the display device can be simplified.

In addition, by removing the space between the backlight unit 700 and the display panel 800, it is possible to prevent a malfunction of the display device or deterioration of the image quality of the display image due to the infiltration of foreign matter into the space.

The backlight unit 700 according to an exemplary embodiment of the present invention may be configured such that a plurality of functional layers are stacked, and at least one of the plurality of functional layers may include a plurality of light sources (not shown) have.

The plurality of functional layers constituting the backlight unit 700, more specifically, the backlight unit 700, are arranged in a flexible manner so that the backlight unit 700 is closely attached to the lower surface of the display panel 800, It can be composed of one material.

The display panel 800 according to an exemplary embodiment of the present invention may be divided into a plurality of regions and may be divided into a plurality of regions corresponding to a gray peak value or a color coordinate signal of each of the divided regions from a corresponding region of the backlight unit 700 The brightness of the emitted light, that is, the brightness of the light source, can be adjusted, so that the brightness of the display panel 800 can be adjusted.

To this end, the backlight unit 700 may be divided into a plurality of divided driving regions corresponding to the divided regions of the display panel 800 and operated.

18 and 19 are views showing a display device according to the present 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 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.

Further, the front cover 30 can be made of a flat plate without the window 30a.

In this case, the front cover 30 is made of a transparent material that transmits light, for example, an injection-molded plastic.

Thus, if the front cover 30 is formed as a flat plate, the frame can be removed from the front cover 30. [

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 (24)

A first reflector;
A second reflector including a slope having at least one inflection point, the second reflector having a pattern in which concave lines and convex lines are arranged along the slope; And
At least one light source disposed between the first and second reflectors,
Wherein the inclined surface includes first and second inclined surfaces, the first inclined surface is disposed adjacent to the light source, the curvature of the first inclined surface is larger than the curvature of the second inclined surface,
Wherein the curvature of each of the concave line and the convex line is arranged along the first inclined plane when the curvature of each of the concave line and the convex line is arranged along the second inclined plane. The method according to claim 1,
Wherein the concave line of the second reflector is a curved surface concave from the inclined surface, the convex line of the second reflector is a convex curved surface from the inclined surface,
The concave line and the convex line of the second reflector are alternately arranged,
Wherein the inclined surface is at least one of a concave surface, a convex surface, and a flat surface,
Wherein the first inclined surface overlaps with the first reflector. delete 3. The liquid crystal display device according to claim 2, wherein the curvature of the concave line is a straight line connecting a contact point of the concave line and a slope and a peak point of the concave line, Satisfaction,
Wherein the angle &thetas; is defined by the following equation (1).
Equation 1
θ = tan ^-1 (h / w) = 0.01 to 15 degrees
Here, h is the maximum depth of the concave line (the shortest distance between the apex of the concave line and the inclined plane), w is the width of the concave line (the contact point between the concave line and the inclined plane, (The shortest distance between the vertical lines connecting the two sides). delete The display device according to claim 1 or 2, wherein curvatures of the concave lines and the convex lines adjacent to each other are different from each other. 3. The apparatus according to claim 1 or 2, wherein a first convex line and a second convex line are disposed on both sides of the one concave line, the curvature of the first convex line is the same as the curvature of the adjacent concave line, 2 The curvature of the convex line and other display devices. 3. The apparatus according to claim 1 or 2, wherein a first convex line and a second convex line are disposed on both sides of the one concave line, a curvature of the first convex line is different from a curvature of an adjacent concave line, 2 The curvature of the convex line and other display devices. 3. The apparatus according to claim 1 or 2, wherein a first concave line and a second concave line are disposed on both sides of the one convex line, a curvature of the first concave line is equal to a curvature of an adjacent convex line, 2 Curvature of the concave line and other display devices. 3. The apparatus according to claim 1 or 2, wherein a first concave line and a second concave line are disposed on both sides of the one convex line, a curvature of the first concave line is different from a curvature of an adjacent convex line, The curvature of the concave line and other display devices. 3. The display device according to claim 1 or 2, wherein a length of the concave line and the convex line is longer than a distance from the light source to the light source. 3. The display device according to claim 1 or 2, wherein a length of the concave line and a convex line is longer and shorter from an area adjacent to the light source to an area farther from the light source. 3. The display device according to claim 1 or 2, wherein a length of the concave line and a convex line are equal to each other in a region far from the light source and a region adjacent to the light source. delete delete delete The display device according to claim 1 or 2, wherein the first inclined surface and the second inclined surface are in contact with each other and are continuously arranged. The display device according to claim 1 or 2, wherein the first inclined surface and the second inclined surface are spaced apart from each other by a predetermined distance, and a surface between the first inclined surface and the second inclined surface is a plane parallel to the first reflector. The method according to claim 1,
Further comprising an optical member disposed spaced apart from the second reflector at regular intervals,
An air guide is formed in a space between the second reflector and the optical member,
Wherein the at least one light source comprises a plurality of light sources,
Wherein the concave line and the convex line are arranged in the same direction as the direction in which the plurality of light sources are arranged. delete delete delete 3. The liquid crystal display device according to claim 2, wherein the curvature of the convex line is a straight line connecting a contact point of the convex line and a slope and a peak point of the convex line, Lt; / RTI > delete

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