KR20120122654A - Backlight unit and liquid crystal display device - Google Patents

Abstract

PURPOSE: A backlight unit and a liquid crystal display device thereof are provided to make the thickness of a light incoming surface different from the thickness of a light emitting surface in a quantum rail to insert the quantum rail between an LED assembly and a light guide plate, thereby increasing brightness. CONSTITUTION: A light guide plate(123) has a first thickness. An LED assembly(129) has a second thickness which is thicker than the first thickness. A quantum rail(127) is located between the light guide plate and the LED assembly. The quantum rail includes a plurality of quantum dots. A plurality of optical sheets(121) include at least one of a diffusing sheet(121a), a prism sheet(121b), and a protective sheet(121c). The optical sheet is formed on the light guide plate.

Description

Backlight Unit and Liquid Crystal Display {BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a backlight unit and a liquid crystal display device, and more particularly to a thin backlight unit and a liquid crystal display device.

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 is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two side-by-side substrates, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

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

The backlight unit includes a light source, and is divided into a direct type and an edge type according to the position of the light source.

As a light source, fluorescent lamps such as Cold Cathode Fluorescent Lamps (CCFLs) and External Electrode Fluorescent Lamps (EEFLs) have been widely used, but according to the trend toward thinner and lighter liquid crystal displays, power consumption has recently been reduced. Light emitting diodes (LEDs), which have advantages in terms of weight, brightness, and the like, are replacing fluorescent lamps.

The direct type backlight unit is a method of directly supplying light emitted from the light emitting diode to the liquid crystal panel by arranging a plurality of light emitting diodes under the liquid crystal panel, and the side type backlight unit arranges a light guide plate under the liquid crystal panel and emits light. By disposing the diode on at least one side of the light guide plate, the light emitted from the light emitting diode is indirectly supplied to the liquid crystal panel by using the refraction and reflection of the light guide plate.

In this case, the side type backlight unit is easier to manufacture than the direct type backlight unit, and has been used because of its light weight and low power consumption.

The side backlight unit includes a plurality of light emitting diodes arranged along one longitudinal length direction, a light guide plate for providing a surface light source to the liquid crystal panel through light emitted from each of the plurality of light emitting diodes, and a lower portion of the light guide plate. It includes a reflecting plate for reflecting the light passing through the back toward the liquid crystal panel, and a plurality of optical sheets interposed over the light guide plate.

On the other hand, liquid crystal displays have recently been used in areas such as portable computers, desktop computer monitors, and wall-mounted televisions, and have a wider display area at a lower cost. Efforts are being made to manufacture LCD devices.

However, among the components constituting the liquid crystal display device, in particular, the thickness of the light guide plate occupies 30% or more of the total thickness of the liquid crystal display device.

The present invention for solving the above problems is to provide a thin, lightweight backlight unit and a liquid crystal display device by reducing the thickness of the light guide plate.

Furthermore, an object of the present invention is to provide a backlight unit and a liquid crystal display device, which can reduce the overall manufacturing cost of a liquid crystal display device by manufacturing a thin light guide plate at a lower cost, and implement brighter brightness by applying a quantum dot. have.

In order to achieve the above object, the backlight unit according to the present invention, the reflection plate;

A light guide plate positioned on the reflection plate and having a first thickness; A plurality of LEDs emitting a first color mounted on a printed circuit board, the LED assembly having a second thickness larger than the first thickness and positioned at a side of the light guide plate; A quantum rail disposed between the light guide plate and the LED assembly and including a plurality of quantum dots therein; At least one of a diffusion sheet, a prism sheet, and a protective sheet, and a plurality of optical sheets formed on the light guide plate.

Here, the quantum rail is positioned between the plurality of LEDs having the second thickness and the light guide plate.

The quantum rail may include a light exit surface having a first width equal to the first thickness, a light entrance plane facing the light exit surface and having a second width equal to the second thickness, and the light exit surface. It includes an inclined surface connecting the light incident surface.

The light incident surface faces each other with the plurality of LEDs, and the light exit surfaces face each other with the light incident surface of the light guide plate.

Meanwhile, the plurality of quantum dots converts wavelengths of the first color incident from the plurality of LEDs and outputs a second color to the plurality of first quantum dots and wavelengths of the first color incident from the plurality of LEDs. It characterized in that it comprises a plurality of second quantum dots to convert to emit a third color.

At this time, the size of the plurality of second quantum dots is larger than the plurality of first quantum dots.

The light guide plate is characterized in that it is produced by extrusion molding.

The printed circuit board may be a flexible printed circuit board (FPCB).

In addition, one side of the printed circuit board is characterized in that extending to cover the upper portion of the light guide plate.

The diffusion sheet is extended so as to partially cover the printed circuit board.

On the other hand, the liquid crystal display device according to the present invention and the reflection plate; A light guide plate positioned on the reflection plate and having a first thickness; A plurality of LEDs emitting a first color mounted on a printed circuit board, the LED assembly having a second thickness larger than the first thickness and positioned at a side of the light guide plate; A quantum rail disposed between the light guide plate and the LED assembly and including a plurality of quantum dots therein; A plurality of optical sheets formed on the light guide plate, the plurality of optical sheets including one or more of a diffusion sheet, a prism sheet, and a protective sheet; And a liquid crystal panel displaying an image formed on the optical sheets.

According to the backlight unit and the liquid crystal display device according to the present invention, in the quantum rail including the quantum dot, the light incident surface and the light emitting surface with respect to light are formed differently and inserted between the LED assembly and the light guide plate, thereby providing brighter brightness. It is possible to reduce the thickness of the light guide plate while providing a liquid crystal display device.

As a result, a light weight and thin liquid crystal display device can be manufactured.

In addition, the light guide plate may be manufactured by extrusion in a rectangular plate shape having a constant thickness, thereby making it easier, cheaper and thinner, and further reducing the overall manufacturing cost of the liquid crystal display device.

1 is a cross-sectional view of a liquid crystal display module according to a first embodiment of the present invention.
Figure 2 is a perspective view showing a quantum rail according to a first embodiment of the present invention.
3 is a perspective view showing a light guide plate according to a first embodiment of the present invention.
4 is a cross-sectional view of a liquid crystal display module according to a second embodiment of the present invention.
5 is a perspective view showing a quantum rail according to a second preferred embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a cross-sectional view of a liquid crystal display module according to a first embodiment of the present invention, Figure 2 is a perspective view showing a quantum rail according to a first embodiment of the present invention, Figure 3 is a preferred embodiment of the present invention 1 is a perspective view illustrating a light guide plate according to an embodiment.

First, referring to FIG. 1, the liquid crystal display device 100 includes a liquid crystal panel 110, a backlight unit 120, and a support main 130 for modularizing the liquid crystal panel 110 and the backlight unit 120. The cover bottom 150 and the top cover 140 are configured.

The liquid crystal panel 110 and the backlight unit 120 have a top cover 140 covering the top edge of the liquid crystal panel 110 in a state where the edge is surrounded by the support main 130 having a rectangular frame shape, and the back of the backlight unit 120. Cover cover 150 to cover each is coupled to the front and rear are integrated through the support main 130 as a medium and modularized.

The liquid crystal panel 110 plays a key role in image expression, and is composed of first and second substrates 112 and 114 bonded to each other with a liquid crystal layer interposed therebetween.

Although not shown in the drawings, a plurality of gate lines and data lines intersect on the inner surface of the first substrate 112, which is commonly referred to as a lower substrate or an array substrate, under the premise of an active matrix scheme, and pixels are defined at each intersection. A thin film transistor (TFT) is provided to correspond one-to-one with a transparent pixel electrode formed in each pixel.

In addition, the inner surface of the second substrate 114 called the upper substrate or the color substrate may correspond to each pixel, for example, a color filter of red (R), green (G), and blue (B) color and each of them. A black matrix covering the non-display elements such as gate lines, data lines, and thin film transistors is provided. In addition, a transparent common electrode covering them is provided.

First and second polarizing plates 119a and 119b for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

In addition, a printed circuit board (not shown) is connected along at least one edge of the liquid crystal panel 110 through a connecting member (not shown) such as a flexible circuit board or a tape carrier package (TCP). During the modularization process, the support main 130 is properly folded and adhered to the rear surface or the cover bottom 150.

When the thin film transistor selected for each gate line is turned on by the on or off signal of the gate driving circuit transmitted through the printed circuit board (not shown), the liquid crystal panel 110 having the above- The signal voltage of the liquid crystal molecules 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 an LED assembly 129 arranged along an edge of the support main 130, a quantum rail 127 arranged along the LED assembly 129 inside the LED assembly 129, and a reflector plate ( 125, a light guide plate 123 mounted on the reflective plate 125, and a plurality of optical sheets 121 interposed thereon.

The LED assembly 129 is formed by each of the plurality of LEDs 129a spaced at regular intervals and mounted on an LED printed circuit board (PCB) 129b.

Here, each of the plurality of LEDs 129a is a side-view type that emits light to one side, and corresponds to a blue LED that emits blue light.

The LED printed circuit board 129b corresponds to a thin flexible printed circuit board (FPCB), and one side of the LED printed circuit board 129b is formed in the first region of the light guide plate 123. It may be formed to cover the upper portion of the inclined surface 210a of the 210 and partially cover the second region 220. Through this, it is possible to prevent the light leakage phenomenon in which light emitted from each of the plurality of blue LEDs 129a is partially leaked out.

The quantum rail 127 guides the light incident from the plurality of blue LEDs 129a of the LED assembly 129 to be incident to the light guide plate 123.

To this end, the quantum rail 127 is positioned between the LED assembly 129 and the light guide plate 123, and more particularly, between the plurality of LEDs and the light guide plate 123, and the light incident surface of the quantum rail 127 is a plurality of LEDs. Each of the light emitting surfaces of the quantum rails 127 faces each other, and the light emitting surfaces of the quantum rails 127 face each other.

Referring to FIG. 2, the quantum rail 127 corresponds to a rectangular glass rail including a tube 127a into which a plurality of quantum dots 200 are inserted.

The quantum rail 127 is heated while sprinkling glass powder on a square tube frame (not shown) that can form a space corresponding to the tube 127a therein, and includes a tube 127a (not shown). ), A plurality of quantum dots 200 are inserted into the tube 127a of the quantum rail (not shown), and both ends of the quantum dot 200 are sealed and stretched to form an elongated rectangular shape. In this case, the plurality of quantum dots 200 may be inserted into the quantum rail (not shown) and then stretched.

As described above, the plurality of quantum dots 200 included in the tube 127a of the quantum rails 127 convert the wavelengths of the blue light emitted from each of the plurality of LEDs 129a to be incident to the light incident surface of the light guide plate 123. To be incident.

Here, the quantum dot 200 is emitted by converting the wavelength of light injected from the light source into a semiconductor nanocrystal of several nanometers (nm) size that is made through a chemical synthesis process, the emission wavelength is changed according to the size of the particles, all of the visible light The color can be emitted.

At this time, the smaller the particle size of the quantum dot 200 generates light of a shorter wavelength, the larger the particle size generates light of a longer wavelength.

The quantum dot 200 may be a II-VI, III-V or IV material, and specifically, CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, InP, GaP, GaInP₂, PbS, ZnO, TiO, AgI, AgBr, PbSe, In₂S₃, In₂Se₃, Cd₃P₂, Cd₃As₂ or GaAs.

Accordingly, the quantum rail 127 which emits white light to the light incident surface of the light guide plate 123 has a plurality of first quantum dots 201 and red light having a first size capable of emitting green light to the inner tube 127a. It includes a plurality of quantum dots 200 consisting of a plurality of second quantum dots 202 having a second size that can emit. Here, the first size of the first quantum dot emitting green light is smaller than the second size of the second quantum dot having a longer wavelength than the green light.

As such, as the plurality of first and second quantum dots 201 and 202 are included in the quantum rail 127, the plurality of first quantum dots 201 having a first size capable of emitting green light may be provided with a plurality of blue colors. A plurality of second quantum dots 202 having a second size capable of emitting green light by emitting wavelengths of light injected from the LED 129a and emitting red light may be wavelengths of light injected from the plurality of blue LEDs 129a. To emit red light.

As a result, the green light emitted from the first quantum dot 201, the red light emitted from the second quantum dot 202, and the blue light emitted from each of the plurality of blue LEDs 129a are combined in the quantum rail 127 to become white light. The white light is emitted from the quantum rail 127 to be incident into the light guide plate 123.

As such, the quantum rail 127 including the plurality of quantum dots 200 including the plurality of first and second quantum dots 201 and 202 is inserted between the plurality of LEDs 129a and the light guide plate 123, thereby providing white light. It is possible to increase the luminance of.

In addition, the white light emitted from the light exit surface of the quantum rail 127 and incident on the light incident surface of the light guide plate 123 is spread evenly to a large area by using the refraction and reflection of the light guide plate 123 to become white light of a surface light source. By being emitted to the outside it is indirectly supplied to the liquid crystal panel 110.

At this time, the light guide plate 123 is a wedge type, and as illustrated in FIG. 3, the first region 210 having a wedge shape having an inclined surface 210a having a first thickness reduced to a second thickness thereon. The second region 220 is connected to the first region 210 and has a rectangular plate shape having a second thickness.

Accordingly, the light guide plate 123 is formed of an inclined surface 210a and an upper surface formed in a plane, a lower surface formed in a plane, and two side surfaces connecting the upper surface and the lower surface and facing each other.

In the light guide plate 123 formed as described above, the wedge-shaped first region 210 allows light emitted from the quantum rail 127 to be incident on the light guide plate 123 without loss, and has a second region formed to a second thickness ( 220 allows the plurality of optical sheets 121 to be positioned on top thereof, thereby reducing the overall thickness of the liquid crystal display.

The light guide plate 123 is manufactured by injection molding used to mold a specific shape because the thickness of the light guide plate 123 is not constant, including the first region 210 having a wedge shape.

Here, the light guide plate 123 may include a pattern of a specific shape on the rear surface to supply a uniform surface light source. The pattern may be configured in various ways such as an elliptical pattern, a polygonal pattern, a hologram pattern, and the like to guide light incident into the light guide plate 123. The lower surface of the light guide plate 123 may be formed by a printing method or an injection method.

The reflective plate 125 positioned on the rear surface of the light guide plate 123 reflects the light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of the light.

In addition, the plurality of optical sheets 121 interposed above the second region 220 in the light guide plate 123 may include a diffusion sheet 121a, at least one prism sheet 121b, a protective sheet 121c, and the like. In addition, the light passing through the light guide plate 123 is diffused or collected so that a more uniform surface light source is incident on the liquid crystal panel 110.

At this time, one side of the diffusion sheet 121a interposed on the light guide plate 123 extends to cover a part of the LED printed circuit board 129b which extends to a part of the second region 220 of the light guide plate 123. The light leakage phenomenon can be prevented by preventing the floating phenomenon of 129b.

Accordingly, the light emitted from each of the plurality of blue LEDs 129a of the backlight unit 120 is incident on the light incident surface of the light guide plate 123 and then refracted toward the liquid crystal panel 110 therein, and the reflecting plate 125 While passing through the plurality of optical sheets 121 together with the light reflected by the) is processed into a more uniform high-quality surface light source is supplied to the liquid crystal panel (110).

Meanwhile, the light shielding tape 160 may be positioned between the LED printed circuit board 129b of the backlight unit 120 and the liquid crystal panel 110, and the light shielding tape 160 may be disposed in addition to the display area of the liquid crystal panel 110. It prevents light from leaking into the realm of.

According to the present invention, the quantum rails 127 may provide a higher quality white surface light source to the liquid crystal panel 110 and may include light guide plates having first and second regions 210 and 220 having different thicknesses. By applying the 123, it is possible to reduce the overall thickness of the liquid crystal display module 100.

4 is a cross-sectional view of a liquid crystal display module according to a second preferred embodiment of the present invention, and FIG. 5 is a perspective view showing a quantum rail according to a second preferred embodiment of the present invention. Here, since the configuration except for the quantum rail and the light guide plate is the same as the configuration of FIGS. 1 and 2, a description of the same configuration will be omitted and will be described based on differences.

First, as shown in FIG. 4, the liquid crystal display device 300 includes a liquid crystal panel 310, a backlight unit 320, and a support main 330 for modularizing the liquid crystal panel 310 and the backlight unit 320. ) And the cover bottom 350, the top cover 340.

The liquid crystal panel 310 and the backlight unit 320 have a top cover 340 covering the upper edge of the liquid crystal panel 310 and the back of the backlight unit 320 in a state where the edge is surrounded by the support main 330 having a rectangular frame shape. Cover cover to cover the 350 is coupled to each front and rear is integrated and modularized via the support main 330.

The backlight unit 320 includes an LED assembly 329 arranged along an edge of the support main 330, a quantum rail 327 arranged along the LED assembly 329 inside the LED assembly 329, and a cover. The reflective plate 325 mounted on the bottom 350, the light guide plate 323 disposed on the reflective plate 325 and facing one side of the quantum rail, and a plurality of optical sheets 321 interposed therebetween. Include.

Among them, the quantum rail 327 is located between the LED assembly 329 and the light guide plate 323, more specifically, between the plurality of LEDs 329a and the light guide plate 323, thereby being included in the LED assembly 329. The plurality of blue LEDs 329a guide light incident from each of the blue LEDs 329a to allow the light to be incident into the light guide plate 323.

Referring to the quantum rail 327 with reference to Figure 5, the quantum rail 327 is formed in a wedge shape including an inclined surface 327a on the upper, a tube in which a plurality of quantum dots 200 are inserted in the inner center ( 327a).

The quantum rail 327 has a light incidence plane having a first width B1, a light exit plane having a second width B2 facing the light incidence plane and narrower than the first width B1, and a light incidence plane. It characterized in that it comprises an inclined surface 327a in the upper portion in the form of narrowing toward the light exit surface.

At this time, the light incident surfaces of the quantum rails 327 face each other and the light emitting surfaces of the plurality of LEDs 329a face each other, and the light exit surfaces of the quantum rails 327 face each other.

Therefore, the first width B1 of the light incident surface of the quantum rail 327 may be formed to be the same as the thickness of each of the plurality of LEDs 329a, and the second width B2 of the light exit surface is the light guide plate 323. It can be formed equal to the thickness of).

The quantum rail 327 may form a space corresponding to the tube 327a therein, and a quantum rail including the tube 327a by heating while spraying glass powder on an inclined rectangular frame (not shown). (Not shown), a plurality of quantum dots 200 are inserted into the tube 327a of the quantum rail (not shown), and both ends thereof are sealed and stretched to form an elongated rectangular shape including an inclined surface 327b. Is formed. In this case, the plurality of quantum dots 200 may be inserted into the quantum rail (not shown) and then stretched.

As described above, the plurality of quantum dots 200 included in the tube 327a of the quantum rail 327 convert the wavelengths of the blue light emitted from each of the plurality of LEDs 329a and enter the white light into the light incident surface of the light guide plate 323. To be incident.

Here, the quantum dot 200 is emitted by converting the wavelength of light injected from the light source into a semiconductor nanocrystal of several nanometers (nm) size that is made through a chemical synthesis process, the emission wavelength is changed according to the size of the particles, all of the visible light The color can be emitted.

At this time, the smaller the particle size of the quantum dot 200 generates light of a shorter wavelength, the larger the particle size generates light of a longer wavelength.

The quantum dot 200 may be a II-VI, III-V or IV material, and specifically, CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, InP, GaP, GaInP₂, PbS, ZnO, TiO, AgI, AgBr, PbSe, In₂S₃, In₂Se₃, Cd₃P₂, Cd₃As₂ or GaAs.

Accordingly, the quantum rail 327 emitting white light to the light incident surface of the light guide plate 323 has a plurality of first quantum dots 201 and red light having a first size capable of emitting green light to the inner tube 327a. It includes a plurality of quantum dots 200 consisting of a plurality of second quantum dots 202 having a second size that can emit. Here, the first size of the first quantum dot emitting green light is smaller than the second size of the second quantum dot having a longer wavelength than the green light.

As such, as the plurality of first and second quantum dots 201 and 202 are included in the quantum rail 327, the plurality of first quantum dots 201 having a first size capable of emitting green light may have a plurality of blue colors. A plurality of second quantum dots 202 having a second size capable of emitting green light by emitting wavelengths of blue light injected from the LED 329a and emitting red light are blue light injected from the plurality of blue LEDs 329a. Convert the wavelength of the emitted red light.

As a result, the green light emitted from the first quantum dot 201, the red light emitted from the second quantum dot 202, and the blue light emitted from each of the plurality of blue LEDs 329a are combined in the quantum rail 327 to become white light. The white light is emitted from the quantum rail 327 to be incident into the light guide plate 323.

As such, the quantum rail 327 including the plurality of quantum dots 200 including the plurality of first and second quantum dots 201 and 202 is inserted between the LED assembly 329 and the light guide plate 323 to provide white light. It is possible to increase the luminance.

The white light emitted from the light exit surface of the quantum rail 327 and incident on the light incident surface of the light guide plate 323 is spread evenly to a large area by using the refraction and reflection of the light guide plate 323 to become white light of a surface light source. By being emitted to be indirectly supplied to the liquid crystal panel 310.

As the quantum rail 327 is formed in a wedge shape including the inclined surface 327b thereon, the light guide plate 323 may be formed as a square plate having a constant thickness, and the thickness of the light guide plate 323 is quantum rail ( It may be formed to be the same as the second width (B2) of the light exit surface of the 327.

Since the light guide plate 323 has a constant thickness, the light guide plate 323 may be manufactured by extrusion molding, which is pushed out of the mold to produce a molding having a constant cross section. In the case of the extrusion molding, unlike the injection molding for molding a specific shape has a constant cross-section, it is convenient to manufacture, has the advantage that can be manufactured in a thin light guide plate of the thin film form.

On the other hand, the light guide plate 323 may include a pattern of a specific shape on the back to supply a uniform surface light source. The pattern may be configured in various ways, such as an elliptical pattern, a polygon pattern, a hologram pattern, and the like to guide the light incident into the light guide plate 323. The lower surface of the 323 may be formed by a printing method or an injection method.

As such, the light incident surface of the first width B1 and the light exit surface of the second width B2 narrower than the first width B1 and the upper inclined surface 327b connecting the light incident surface and the light exit surface are Inserting a wedge-shaped quantum rail 327 between the plurality of LEDs 329a and the light guide plate 323 increases the luminance of the light emitting device and increases the color reproducibility, while the thickness of the light guide plate 323 is greater than that of the light guide plate 123 of FIG. 1. It can be adjusted thinly.

Meanwhile, when the thicknesses of the plurality of LEDs 329a included in the LED assembly 329 are also narrowly adjusted, the first width of the light incident surface of the quantum rail 327 is also narrowly adjusted accordingly, so that the inclination angle of the inclined surface 327b is adjusted. It can also be flattened by lowering the degree.

For example, the light guide plate is manufactured by extrusion molding to produce the thinnest A thickness, and the LED having the narrowest B thickness is applied to the LED assembly. Accordingly, the light incident surface having the same width as the B thickness of the LED and A slimmer backlight unit is realized by inserting a quantum rail having a light emitting surface having the same width as A thickness and an inclined surface connecting the light incident surface and the light emitting surface between the plurality of LEDs and the light guide plate. The liquid crystal display device can be implemented.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

110, 310: liquid crystal panel 120, 320: backlight unit
125, 325: reflector 123, 323: light guide plate
121, 321: Multiple optical sheets 127, 327: Quantum rail
327a: tube 327b: inclined surface
200: quantum dot 201: first quantum dot
202: second quantum dot 129, 329: LED assembly
130, 330: support main 140, 340: top cover
150, 350 cover cover

Claims (11)

A reflector;
A light guide plate positioned on the reflection plate and having a first thickness;
A plurality of LEDs emitting a first color mounted on a printed circuit board, the LED assembly having a second thickness larger than the first thickness and positioned at a side of the light guide plate;
A quantum rail disposed between the light guide plate and the LED assembly and including a plurality of quantum dots therein;
And at least one of a diffusion sheet, a prism sheet, and a protective sheet, the backlight unit including a plurality of optical sheets formed on the light guide plate.
The method of claim 1,
The quantum rail is
And a light emitting plate disposed between the plurality of LEDs having the second thickness and the light guide plate.
The method of claim 1,
The quantum rail is
A light exit surface having a first width equal to the first thickness, a light entrance surface facing the light exit surface and having a second width equal to the second thickness, and connecting the light exit surface and the light entrance surface A backlight unit comprising an inclined surface.
The method of claim 3, wherein
And the light incidence planes face each other with the plurality of LEDs, and the light exit planes face each other with the light incidence plane of the light guide plate.
The method of claim 1,
The plurality of quantum dots
Convert a plurality of first quantum dots to convert the wavelength of the first color incident from the plurality of LEDs to emit a second color and to convert the wavelength of the first color incident from the plurality of LEDs to emit a third color A backlight unit, characterized in that it comprises a plurality of second quantum dots.
6. The method of claim 5,
And a plurality of second quantum dots larger in size than the plurality of first quantum dots.
The method of claim 1,
The light-
A backlight unit, which is produced by extrusion molding.
The method of claim 1,
The printed circuit board is a flexible printed circuit board (FPCB), characterized in that the liquid crystal display device.
The method of claim 1,
Wherein one side of the printed circuit board extends to cover a portion of an upper portion of the light guide plate.
The method of claim 9,
And the diffusion sheet extends to partially cover the printed circuit board.
A reflector;
A light guide plate positioned on the reflection plate and having a first thickness;
A plurality of LEDs emitting a first color mounted on a printed circuit board, the LED assembly having a second thickness larger than the first thickness and positioned at a side of the light guide plate;
A quantum rail disposed between the light guide plate and the LED assembly and including a plurality of quantum dots therein;
A plurality of optical sheets formed on the light guide plate, the plurality of optical sheets including one or more of a diffusion sheet, a prism sheet, and a protective sheet; And
Liquid crystal panel for displaying an image formed on the optical sheets
Liquid crystal display comprising a.

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