KR20150074497A - Backlight unit and liquid crystal display device including the same - Google Patents

Abstract

The present invention relates to a backlight unit and a liquid crystal display device including the same. The liquid crystal display device comprises: a liquid crystal panel; a LED assembly including a plurality of LEDs and arranged at the bottom of the liquid crystal panel; a reflector reflecting light emitted from each LED toward the liquid crystal panel; and the backlight unit including a reflection means located at the top of the reflector. The reflection means comprises: a first reflection unit protruding upwards so that the center becomes narrow; and a plurality of second reflection units enlarged along the width direction and the height direction on a lower end of the first reflection unit. Accordingly, the liquid crystal display device reduces a number of total LEDs, is light, and has a competitive price.

Description

BACKLIT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE INCLUDING THE SAME [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit and a liquid crystal display device including the same, and more particularly, to a backlight unit capable of reducing the number of LEDs and a liquid crystal display including the same.

A liquid crystal display device (LCD), which is advantageous for moving picture display and has a large contrast ratio and is actively used in TVs and monitors, exhibits optical anisotropy and polarization properties of a liquid crystal, And the like.

Such a liquid crystal display device has a liquid crystal panel in which a liquid crystal panel is interposed between two adjacent substrates through a liquid crystal layer as an essential component and changes the alignment direction of the liquid crystal molecules in an electric field in the liquid crystal panel to realize a difference in transmittance do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image. To this end, a backlight unit having a light source is disposed on the back of the liquid crystal panel.

As a light source of the backlight unit, a fluorescent lamp such as a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) has been widely used. Recently, however, Light-emitting diodes (LEDs), which have advantages in terms of power consumption, weight, and brightness, have been replacing fluorescent lamps with lightweight trends.

According to the position of the light source, the backlight unit can be divided into a direct type and an edge type. In a direct-type backlight unit, a light source is disposed under the liquid crystal panel, The backlight unit of the side type system is a system in which a light guide plate is disposed under the liquid crystal panel and a light source is disposed on at least one side of the light guide plate to refract and reflect light from the light guide plate to indirectly To the liquid crystal panel.

At this time, the direct-type backlight unit requires a larger number of light sources than the side-type backlight unit because the light source is disposed under the liquid crystal panel.

Recently, a liquid crystal display device has been widely used in various fields such as a desktop computer monitor and a wall-mounted television, as well as a portable computer, so as to have a wide display area and to realize a lightweight, thin and relatively inexpensive liquid crystal display device The direct display type liquid crystal display device has a problem in that it is difficult in terms of light weight and cost because the number of LEDs included increases as the display area is widened.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a backlight unit capable of reducing the total number of LEDs and a liquid crystal display device including the backlight unit.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a liquid crystal panel; An LED assembly including a plurality of LEDs disposed at a lower portion of the liquid crystal panel, and a reflector reflecting the light emitted from each of the plurality of LEDs toward the liquid crystal panel; And a reflecting unit located at an upper portion of the reflecting plate, wherein the reflecting unit includes a first reflecting part of a concave-convex pattern protruding upward and a central part of which is gradually tapered, And a plurality of second reflectors extending along the longitudinal and longitudinal directions.

And the reflecting means is located at the center of the LED through holes located in all directions.

The first reflecting portion is a pyramid shape having a conical shape or a polygonal side surface.

And the parametric side surface is a curved surface having a curvature.

And a coupling hole is formed at an end of the first reflecting portion.

The backlight unit may further include a support pin coupled to the coupling hole and a diffusion plate positioned above the reflection plate, wherein the diffusion plate maintains an optical gap with the reflection plate constant through the support pin .

And a diffusing plate positioned above the first reflecting portion, wherein the diffusing plate maintains an optical gap with the reflecting plate constant through the first reflecting portion.

Each of the plurality of second reflective portions is formed by extending a certain area along a lateral direction and a longitudinal direction from a lower end of a boundary region between the side surfaces of the first reflective portion and has a mountain shape protruding from the center of the upper surface thereof .

And a pattern for diffusing and scattering is formed on an outer surface of the reflecting means.

Characterized in that the pattern is formed by corrosion or polishing means.

Meanwhile, the backlight unit according to the present invention includes an LED assembly including a plurality of LEDs; A reflector reflecting the light emitted from each of the plurality of LEDs toward the front direction and having a light pattern projected from the inner surface; And a reflecting means located on the upper side of the reflecting plate, wherein the reflecting means includes: a first reflecting portion of a concave-convex pattern protruding upward and a central portion of which is gradually narrowed; And a plurality of second reflecting portions extending along the first and second reflecting portions.

And the reflecting means is located at the center of the LED through holes located in all directions.

The first reflecting portion is a pyramid shape having a conical shape or a polygonal side surface.

And the parametric side surface is a curved surface having a curvature.

And a coupling hole is formed at an end of the first reflecting portion.

A support pin coupled to the coupling hole, and a diffusion plate positioned above the reflection plate, wherein the diffusion plate maintains an optical gap with the reflection plate constant through the support pin.

And a diffusing plate positioned above the first reflecting portion, wherein the diffusing plate maintains an optical gap with the reflecting plate constant through the first reflecting portion.

Each of the plurality of second reflective portions is formed by extending a certain area along a lateral direction and a longitudinal direction from a lower end of a boundary region between the side surfaces of the first reflective portion and has a mountain shape protruding from the center of the upper surface thereof .

And a pattern for diffusing and scattering is formed on an outer surface of the reflecting means.

Characterized in that the pattern is formed by corrosion or polishing means.

As described above, according to the backlight unit and the liquid crystal display device including the same according to the present invention, since the reflecting means is positioned between the LED through holes, the brightness of the overlap region where the light is overlapped by the adjacent LEDs is increased The overlap area can be enlarged at the same time.

As a result, the number of LEDs can be reduced by widening the spacing distance between the LEDs as well as increasing the spacing between the LED assemblies.

Further, it is advantageous in that the manufacturing cost of the entire liquid crystal display device can be reduced and the lightweight liquid crystal display device can be realized by reducing the cost of the LED component.

Further, there is an advantage that a support pin which can maintain the optical gap constant between the reflection plate and the diffusion plate can be omitted.

1 is an exploded perspective view illustrating a liquid crystal display device according to a preferred embodiment of the present invention.
2 is a cross-sectional view illustrating a liquid crystal display device according to a preferred embodiment of the present invention.
FIG. 3A is a perspective view showing a reflecting means according to a preferred embodiment of the present invention; FIG.
FIG. 3B is a plan view showing a reflecting means according to a preferred embodiment of the present invention. FIG.
3C is a cross-sectional view illustrating a reflecting means according to a preferred embodiment of the present invention.
4 is a view for explaining a light propagation path in a backlight unit according to a preferred embodiment of the present invention.
5 is a cross-sectional view illustrating a liquid crystal display device according to another embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view illustrating a liquid crystal display device according to a preferred embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating a liquid crystal display device according to a preferred embodiment of the present invention.

The liquid crystal display 100 according to the present invention includes a liquid crystal panel 110, a backlight unit 120, a support main body 130 for modularizing the liquid crystal panel 110 and the backlight unit 120, A top cover 140, and a cover bottom 150.

The liquid crystal panel 110 is a part that plays a key role in image display and is composed of a first substrate 112 and a second substrate 114 which are bonded to each other with a liquid crystal layer interposed therebetween.

Although not shown in the drawing, a plurality of gate lines and data lines cross each other on the inner surface of a first substrate 112, which is usually referred to as a lower substrate or an array substrate, on the premise of an active matrix system, pixels are defined, And a thin film transistor (TFT) is provided and connected in a one-to-one correspondence with the transparent pixel electrode formed in each pixel.

On the inner surface of the second substrate 114 called an upper substrate or a color substrate, a color filter of red (R), green (G), and blue (B) And a black matrix for covering non-display elements such as a gate line, a data line, and a thin film transistor.

A transparent common electrode corresponding to the pixel electrode may be provided on the first substrate 112 or the second substrate 114.

The first and second polarizers 119a and 119b, which selectively transmit only specific light, are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

A drive printed circuit board 117 is connected to at least one edge of the liquid crystal panel 110 via a connection member 116 such as a flexible circuit board or a tape carrier package (TCP) The cover main body 130 or the cover bottom 150 may be properly brought into close contact with the side surface of the support main body 130 or the cover bottom 150.

When the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driving circuit transmitted through the driving printed circuit board 117, the liquid crystal panel 110 having the above- The signal voltage is transmitted to the corresponding pixel electrode through the data line, and the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode.

On the rear surface of the liquid crystal panel 110, a backlight unit 120 is provided to supply light so that the difference in transmittance can be displayed as an image.

The backlight unit 120 includes a plurality of LED assemblies 129, a reflector 127 positioned on the plurality of LED assemblies 129, a diffuser plate 124 located on the top of the reflector 127, Reflecting means 160 and a support pin 128 positioned between the diffuser plate 124 and the diffuser plate 124 and an optical sheet 121 positioned above the diffuser plate 124.

Each of the plurality of LED assemblies 129 is formed by mounting a plurality of LEDs 129a on an LED printed circuit board (PCB) 129b while being spaced apart from each other by a predetermined distance.

Each of the plurality of LEDs 129a includes an LED lens for refracting and reflecting the light generated from the substantially emitting LED chip.

At this time, the LED lens may be a refraction type LED lens that double refracts the light generated from the LED chip so that all the light is directed to the liquid crystal panel 110.

Alternatively, the LED lens may be a reflective LED lens that refracts and totally reflects light generated from the LED chip so that some light is directed to the liquid crystal panel 110, and a part of the light is directed to the cover bottom 150.

The LED 129a using the reflective LED lens has a larger light directing angle than the LED using the refracting LED lens that directs all the light toward the liquid crystal panel 110. Therefore, So that a smaller number of LEDs 129a can be used. In addition, a smaller number of LEDs 129a can be used by widening the spacing between the LEDs 129a as well as the spacing between the LEDs 129a.

The plurality of LED assemblies 129 may be arranged in parallel along the longitudinal direction of the cover bottom 150 or may be arranged in parallel along a direction perpendicular to the longitudinal direction.

The LED printed circuit board 129b on which the plurality of LEDs 129a are mounted may correspond to a metal core printed circuit board having a heat dissipating function. A heat sink (not shown) may be provided to allow heat generated from each of the plurality of LEDs 129a to be emitted to the outside.

A reflective plate 127 is disposed above the LED printed circuit board 129b and reflects a part of light emitted from each of the plurality of LEDs 129a toward the cover bottom 150 toward the liquid crystal panel 110 side.

The reflection plate 127 is composed of a first portion 125 including a plurality of LED through holes 125a and a second portion 126 slantingly connected along the edge of the first portion 125 in an outward direction .

Here, the plurality of LED through holes 125a correspond to the plurality of LEDs 129a included in the plurality of LED assemblies 129, and each of the plurality of LEDs 129a can pass through.

Each of the LEDs 129a is exposed through the plurality of LED through holes 125a to be exposed and the reflection plate 127 is seated on the LED printed circuit board 129b.

A diffusion plate 124 for diffusing light with an optical gap G therebetween is disposed on the reflection plate 127 having the above-described structure.

The optical gap G is an interval required to diffuse the light emitted from each of the plurality of LEDs 129a to form light uniformity.

The reflection means 160 and the support pins 128 are provided between the reflection plate 127 and the diffusion plate 124 in order to maintain the optical gap G constant and to further increase the light from each of the plurality of LEDs 129a. Respectively.

Here, the reflecting means 160 is positioned above the reflection plate 127, thereby reflecting and refracting the light emitted from each of the plurality of LEDs 129a to increase the brightness.

The reflecting means 160 includes a first reflecting portion 162 having a pyramid shape having a conical portion whose center portion is gradually narrowed or a side surface of which is polyhedron and a second reflecting portion 162 extending from the lower end of the first reflecting portion 162 164).

At this time, the reflecting unit 160 may have a line shape formed by connecting a plurality of first reflecting units 162 through rows or columns through a plurality of second reflecting units 164, And may be connected in a matrix form.

A coupling hole 128a is formed at the end of the first reflecting portion 162 of the reflecting means 160. [ At this time, the coupling hole 128a may be formed in at least one of the plurality of first reflection parts 162, for example, one or two by one.

The reflecting means 160 is positioned between the LEDs 129a adjacent to each other, thereby increasing the brightness of the overlapping region where the light emitted from the adjacent LED 129a overlaps (overlapping) and enlarging the overlapping region. Accordingly, the interval between the plurality of LEDs can be widened and the number of LEDs can be reduced.

Meanwhile, the second portion 164 of the reflecting means 160 is shown covering a part of the reflection plate 127, but it may be formed so as to cover the periphery of the LED 129a. Such a reflecting means 160 will be described later in detail.

The support pin 128 is inserted between the reflection plate 127 and the diffusion plate 124 in a state of being coupled with the reflection means 160 through the end fitting hole 128a of the first reflection portion 162 of the reflection means 160 .

On the other hand, when the plurality of LEDs 129a described above are applied to a reflective LED, the light guiding angle is wide, so there is an advantage that the optical gap G between the reflection plate 127 and the diffusion plate 124 can be reduced. Thus, the entire thickness of the liquid crystal display device 100 can be reduced.

The optical sheet 121 is positioned above the diffusion plate 124.

Here, the optical sheet 121 may include at least a diffusion sheet, at least one light collecting sheet, and a protective sheet. Various functional sheets such as a dual brightness enhancement film called DBEF (dual brightness enhancement film) It is possible to increase the brightness of the light emitted from the plurality of LEDs 129a included.

The light emitted from each of the plurality of LEDs 129a is incident on the liquid crystal panel 110 by the reflecting plate 127, the reflecting means 160, the diffusing plate 124 and the optical sheet 121, By using this, the liquid crystal panel 110 displays the high luminance image to the outside.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 140, the support main body 130, and the cover bottom 150.

Here, the top cover 140 has a rectangular frame shape that is bent in a cross section so as to cover the upper and side edges of the liquid crystal panel 110, and the top cover 140 is opened in the liquid crystal panel 110 Is displayed.

The cover bottom 150 on which the liquid crystal panel 110 and the backlight unit 120 are mounted and which is the basis for assembling the entire structure of the liquid crystal display device 100 is formed into a rectangular plate shape, And a pair of side supports (not shown) in the form of a pair of bars joined to opposite ends of the opposite side edges.

The remaining two edges of the cover bottom 150 except for the side supports (not shown) may be bent obliquely to have the same height as the bottom edges of the cover bottom 150 to form a predetermined space in which the backlight unit 120 can be seated .

The support main 130 mounted on the cover bottom 150 and having a rectangular frame shape covering the edges of the liquid crystal panel 110 and the backlight unit 120 is combined with the top cover 140 and the cover bottom 150, .

Meanwhile, the top cover 140 may be referred to as a case top or a top case, and the support main 130 may be referred to as a guide panel or a main support or a mold frame, and the cover bottom 150 may be referred to as a bottom cover.

FIG. 3A is a perspective view showing a reflecting means according to a preferred embodiment of the present invention, FIG. 3B is a plan view showing a reflecting means according to a preferred embodiment of the present invention, FIG. 3C is a cross- Fig.

As shown in the figure, the reflecting means 160 includes a first reflecting portion 162 formed of a concave-convex pattern protruding upward and becoming narrower at a center portion thereof, And a plurality of second reflective portions 164 extending along the direction.

The first reflector 162 may have a cone shape or a pyramid shape whose sides are polyhedron.

At this time, the side surface 310 of the first reflective portion 162 having a pyramid shape may be formed as a curved surface having a curvature. By controlling the refraction direction of the light through this curved surface, the light distribution on the overlapping region can be controlled. To this end, the curved surface may be a depressed curvature in the inward direction of the first reflective portion, and the curvature may be a variable curvature.

The first reflecting portion 162 may have a cone shape or a pyramid shape whose sides are polyhedrons. Hereinafter, a pyramid having four side faces will be described as an example.

2) can be inserted at the end of the first reflecting portion 162 to hold the optical gap between the reflecting plate (127 in FIG. 2) and the diffuser plate (124 in FIG. 2) Hole 128a.

Each of the plurality of second reflective portions 164 is formed by extending a predetermined area along the lateral direction and the longitudinal direction from the lower end of the boundary region between the side surfaces of the first reflective portion 162, .

A lower portion of the reflecting means 160 having the above-described structure may include a hook means 168 for allowing the reflecting means 160 to be fixed by being hooked onto the cover bottom (150 in FIG. 2).

The reflecting means 160 is positioned between the adjacent LED through holes 125a, thereby being positioned between the plurality of LEDs 129a exposed through the plurality of LED through holes 125a.

More specifically, the reflecting means 160 is disposed between the plurality of LED through holes 125a formed along the longitudinal direction of the first portion 125, that is, between the neighboring LED through holes 125a Or may be located between a plurality of LED through holes 125a formed along a single direction, i.e., between neighboring LED through holes 125a. However, more preferably, the reflecting means 160 is located at the center of the four LED through holes 125a formed on all four sides.

Since the reflecting means 160 is positioned at the center of the four LED through holes 125a, each of the plurality of LEDs 129a is influenced by the four reflecting means 160 formed on all four sides.

Four reflective means 160 are positioned around each LED 129a and four reflecting means 160 may be positioned at each corner of the rectangular region around the LED 129a .

Accordingly, the light emitted from the LED 129a is reflected by each of the four first reflecting portions 162 surrounding the first reflecting portion 162 and facing the first reflecting portion 162 facing the first reflecting portion 162, As shown in FIG.

The area of arrival of the light emitted from each of the plurality of LEDs 129a is widened, and the overlap region where the light generated from the LEDs 129a adjacent to each other overlap is widened.

As a result, the distance between the plurality of LEDs 129a and the distance between the LEDs 129 can be widened, so that the total number of the LEDs 129a can be reduced. By reducing the number of parts of the LED as described above, the cost can be reduced and a lightweight liquid crystal display device can be realized.

Meanwhile, the reflecting unit 160 may have a line shape formed by connecting the rows and columns through the second reflecting unit 164, or may be connected in a matrix form along rows and columns. This is advantageous in that it is quick and convenient to arrange the line-shaped reflecting means 160 rather than placing the reflecting means 160 on the reflecting plate one by one, and the reflecting means 160 in the form of a matrix is faster and more convenient.

The reflection means 160 may be formed of the same material as the reflection plate 127. For example, a resin material such as polyethylene terephthalate (PET), polyethylene naphthalate, polymethyl methacrylate (PMMA), polycarbonate, polystyrene, polyolefin, cellulose And may include one of cellulose acetate and polyvinyl chloride.

However, the present invention is not limited to this, and the reflecting means 160 may be formed of the same material as one of the cover bottom (150 in FIG. 1), the support main (130 in FIG. 1) and the support pin The outer surface of the reflecting means 160 may include a pattern for diffusing and scattering. More specifically, the surface can be optionally corroded or polished to form a pattern to impart surface roughness to the surface of the reflecting means 160.

As described above, the shape of the reflecting means 160 can be freely deformed, and the light path can be adjusted or the amount of light emitted can be adjusted by adding additional structures for diffusing and reflecting.

The light traveling path in the backlight unit 120 to which the reflection plate 127 as described above is applied will be described with reference to FIG.

4 is a view for explaining a light path in a backlight unit according to a preferred embodiment of the present invention. Here, the structure of the support pin is omitted for explaining the traveling direction of the light in more detail.

2, the light emitted from each of the plurality of LEDs 129a is reflected by the first light L11 emitted toward the liquid crystal panel 110 (see FIG. 2), the first reflection portion 162 of the reflection means 160, And a second light L21 that is emitted toward the second light source.

Accordingly, some of the first light L11 emitted from each of the plurality of LEDs 129a passes through the diffusion plate 124 and the optical sheet 121 and is supplied to the liquid crystal panel 110 And some light L13 is refracted (reflected) by the diffuser plate 124 or the optical sheet 121 and then reflected again by the reflecting means 160 in the direction toward the liquid crystal panel (110 in FIG. 2) .

The second light L21 emitted from each of the plurality of LEDs 129a is reflected (L22) in the direction toward the liquid crystal panel (110 in Fig. 2) by the reflecting means 160. Fig. Part of the reflected light L22 passes through the diffuser plate 124 and the optical sheet 121 and is supplied to the liquid crystal panel 110 in FIG. 2, and a part of the light L24 passes through the diffuser plate 124 Or reflected by the optical sheet 121 and directed to the first reflecting portion 162 or the second reflecting portion 164 of the reflecting means 160. [

As described above, the light emitted from each of the plurality of LEDs 129a is reflected by the reflecting means 160 and is emitted to the overlapping region between the LEDs 129a, thereby increasing the light brightness of the overlapping region and making the overlapping region wider . Accordingly, the spacing between the LEDs 129a and the spacing between the LED assemblies 129 can be widened, and the total number of LEDs can be reduced.

Further, by reducing the cost of the LED component, the manufacturing cost of the entire liquid crystal display device can be reduced and a lightweight liquid crystal display device can be realized.

On the other hand, in the case of an LED employing a reflective LED lens, the light emitted from each of the plurality of LEDs 129a is divided into first light emitted toward the liquid crystal panel (110 of FIG. 2) The second light emitted toward the second reflecting portion 164, and the third light emitted toward the second reflecting portion 164. Here, some of the third light is reflected by the second reflecting portion 164 of the reflecting means 160 in the direction toward the first reflecting portion 162, and a part of the light is reflected by the liquid crystal panel 110 As shown in FIG.

Also in this case, the light emitted from each of the plurality of LEDs 129a is reflected by the first reflecting portion 162 and the second reflecting portion 164 and emitted to the overlapping region between the LEDs 129a, It can be seen that the overlapping area can be widened. Accordingly, the spacing between the LEDs 129a and the spacing between the LED assemblies 129 can be widened, and the total number of LEDs can be reduced.

5 is a cross-sectional view illustrating a liquid crystal display device according to another embodiment of the present invention. Here, the configuration except for the configuration of the reflecting means and the support plate is the same as that of FIG. 2, and thus a detailed description of the same configuration will be omitted.

As shown in the figure, the reflecting means 260 includes a first reflecting portion 262 formed of a concave-convex pattern protruding upward and having a tapered central portion gradually becoming narrower, And a plurality of second reflective portions 164 extending along the direction.

Here, the first reflector 262 and the second reflector 264 increase the brightness of the overlap region where the light emitted from the LEDs 229a adjacent to each other overlap and widen the overlap region.

At this time, the first reflecting portion 262 is formed so as to be in contact with the diffusing plate 224 located at the upper portion, thereby supporting the diffusing plate 224.

A plurality of supporting plates (128 in FIG. 2), which serve to keep the optical gap G between the reflecting plate 227 and the diffusing plate 224 constant through the first reflecting portion 262, .

The embodiments of the present invention as described above are merely illustrative, and those skilled in the art can make modifications without departing from the gist of the present invention. Accordingly, the protection scope of the present invention includes modifications of the present invention within the scope of the appended claims and equivalents thereof.

100: liquid crystal display device 110: liquid crystal panel
120: Backlight unit 129: LED assembly
127, 227: reflection plate 125a, 225a: LED through hole
160, 260: Reflecting means 162, 262:
164, 164: second reflecting portion 124: diffuser plate
121: Optical sheet

Claims (20)

A liquid crystal panel;
An LED assembly including a plurality of LEDs disposed at a lower portion of the liquid crystal panel, and a reflector reflecting the light emitted from each of the plurality of LEDs toward the liquid crystal panel;
And a backlight unit including reflection means positioned above the reflection plate,
The reflecting means includes a first reflecting portion of a concave-convex pattern protruding upward and a central portion of which is gradually narrowed, and a plurality of second reflecting portions extending in a lateral direction and a longitudinal direction at a lower end of the first reflecting portion .
The method according to claim 1,
And the reflective means is located at the center of the LED through hole located in each of the four directions.
The method according to claim 1,
Wherein the first reflecting portion is a pyramid shape having a conical shape or a side surface of a polyhedron.
The method of claim 3,
And the side of the parametric shape is a curved surface having a curvature.
The method of claim 3,
And a coupling hole is formed at an end of the first reflection part.
6. The method of claim 5,
The backlight unit includes:
A support pin coupled to the coupling hole,
Further comprising a diffuser positioned above the reflector,
Wherein the diffusion plate maintains an optical gap with the reflection plate constant through the support pin.
The method according to claim 1,
Further comprising a diffuser positioned above the first reflector,
Wherein the diffusing plate maintains an optical gap between the diffusing plate and the reflector constant through the first reflector.
The method according to claim 1,
Wherein each of the plurality of second reflective portions is formed by extending a predetermined area along a lateral direction and a longitudinal direction from a lower end of a boundary region between the side surfaces of the first reflective portion and has a mountain shape protruding from the center of the upper surface thereof Liquid crystal display device.
The method according to claim 1,
And a pattern for diffusing and scattering is formed on the outer surface of the reflecting means.
The method according to claim 1,
Wherein the pattern is formed by corrosion or polishing means.
An LED assembly including a plurality of LEDs;
A reflector reflecting the light emitted from each of the plurality of LEDs toward the front direction and having a light pattern projected from the inner surface;
And reflection means located on top of said reflection plate,
The reflecting means includes a first reflecting portion of a concave-convex pattern protruding upward and a central portion of which is gradually narrowed, and a plurality of second reflecting portions extending in a lateral direction and a longitudinal direction at a lower end of the first reflecting portion Backlight unit.
12. The method of claim 11,
Wherein the reflection means is located at the center of the LED through hole located in each of the four directions.
12. The method of claim 11,
Wherein the first reflecting portion is a pyramid shape having a conical shape or a polygonal side surface.
In the thirteenth aspect,
Wherein the parametric side surface is a curved surface having a curvature.
14. The method of claim 13,
And a coupling hole is formed at an end of the first reflecting portion.
16. The method of claim 15,
A support pin coupled to the coupling hole,
Further comprising a diffuser positioned above the reflector,
Wherein the diffuser plate maintains an optical gap with the reflector plate constant through the support pin.
12. The method of claim 11,
Further comprising a diffuser positioned above the first reflector,
Wherein the diffusion plate maintains an optical gap with the reflector constant through the first reflector.
12. The method of claim 11,
Wherein each of the plurality of second reflective portions is formed by extending a predetermined area along a lateral direction and a longitudinal direction from a lower end of a boundary region between the side surfaces of the first reflective portion and has a mountain shape protruding from the center of the upper surface thereof Backlight unit.
12. The method of claim 11,
Wherein a pattern for diffusing and scattering is formed on the outer surface of the reflecting means.
12. The method of claim 11,
Wherein the pattern is formed by corrosion or polishing means.

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