KR20150102139A - A backlight unit and a liquid crystal display device having the same - Google Patents

Abstract

The embodiment of the present invention relates to a backlight unit and a liquid crystal display device, capable of inducing a light conversion from blue light to white light by using a light recycling among a while guide panel, a quantum dot film, a reflection sheet, and a light guide plate, and preventing the visibility of blue light due to the leakage of the blue light. The backlight unit includes a guide panel which includes a vertical part and a horizontal part which is extended from the inner side of the vertical part and the quantum dot film which includes a first region which is an edge region and a second region which is adjacent to the first region. The first region corresponds to the lower side of the horizontal part.

Description

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

The present invention relates to a backlight unit and a liquid crystal display including the same.

Recently, various display devices have been developed. Examples of display devices include a cathode ray tube, a liquid crystal display device, a plasma display device, an organic light emitting display device, and a field emission display device. Of these, the liquid crystal display device can be made light and thin with less power consumption than conventional CRTs. The Liquid Crystal Display (Liquid Crystal Display) occupies a large portion in a large-sized display market as well as a small size. The liquid crystal is injected between two thin glass substrates to generate light and darkness according to the change of the liquid crystal molecular arrangement during power supply, . Unlike an organic light emitting display device or the like, the liquid crystal display device itself is a non-light emitting type, so it is essential to use a backlight unit that is a backlight source.

The backlight unit is divided into edge type and direct type according to the position of the light source. The edge type is a structure in which a light source is provided on a side surface of the light guide plate.

The direct type is a structure that is mainly developed with the size of a liquid crystal display device being enlarged. One or more light sources are arranged on the lower surface of the liquid crystal display panel to supply light to the liquid crystal display panel.

The direct-type backlight unit has advantages in that it can utilize a larger number of light sources than the edge-type backlight unit and can secure a high luminance, but has a disadvantage that the thickness becomes thicker than the edge type in order to ensure uniformity of brightness have.

Recently, optical films using quantum dots have been developed for high color reproducibility.

The optical film using the quantum dot can convert the blue light provided from the light source into the white light. However, when an optical film using such a quantum dot is used, a space is formed due to manufacturing tolerances between the guide panel, the light guide plate and the optical films, and blue light is leaked to the space to be visually recognized.

The present invention can provide a liquid crystal display device in which the color reproducibility is improved by using a quantum dot film for converting blue light into white light and a problem that blue light is leaked to a space formed between the optical film and the guide panel A backlight unit and a liquid crystal display including the same are provided.

A backlight unit according to an exemplary embodiment of the present invention includes a guide panel including a vertical portion and a horizontal portion extending from an inner surface of the vertical portion; And a quantum dot film including a first region that is an edge region and a second region that is adjacent to the first region, wherein the first region corresponds to a lower surface of the horizontal portion.

A backlight unit according to an embodiment of the present invention includes: a light emitting diode disposed on one side of the guide panel; And a light guide plate disposed under the quantum dot film and corresponding to the first region.

In the backlight unit according to the embodiment of the present invention, the light emitting diode emits blue light.

In the backlight unit according to the embodiment of the present invention, the quantum dot film converts the blue light into white light.

In the backlight unit according to the embodiment of the present invention, the backlight unit further includes optical sheets disposed on the top of the quantum dot film and corresponding to the second region.

In the backlight unit according to the embodiment of the present invention, the side surfaces of the optical sheets face the inner surface of the horizontal portion.

In the backlight unit according to the embodiment of the present invention, the guide panel is white or silver.

In the backlight unit according to the embodiment of the present invention, the lower surface of the horizontal portion is white or silver.

In the backlight unit according to the embodiment of the present invention, the lower surface and the inner surface of the horizontal portion are white or silver.

In the backlight unit according to the embodiment of the present invention, the optical sheets include a diffusion sheet and at least one prism sheet.

In the backlight unit according to the embodiment of the present invention, a reflective sheet disposed on the back surface of the light guide plate; And a bottom cover for accommodating the light guide plate.

In the backlight unit according to the embodiment of the present invention, the vertical portion and the horizontal portion are perpendicular to each other.

In a liquid crystal display device according to an embodiment of the present invention, a guide panel including a vertical portion and a horizontal portion extending from the inner side of the vertical portion,

A quantum dot film comprising a first region that is an edge region and a second region that is adjacent to the first region; A light emitting diode disposed on one side of the guide panel; A light guide plate disposed under the quantum dot film and corresponding to the first region; Optical sheets disposed on the quantum dot film and corresponding to the second region; A reflective sheet disposed on a back surface of the light guide plate; A bottom cover for accommodating the light guide plate; A liquid crystal panel disposed on the optical sheets; And a top case surrounding an edge of the liquid crystal panel, wherein the first region corresponds to a lower surface of the horizontal portion.

In the liquid crystal display device according to an embodiment of the present invention, the light emitting diode emits blue light, and the quantum dot film converts the blue light into white light.

In the liquid crystal display device according to an embodiment of the present invention, the side surfaces of the optical sheets face the inner surface of the horizontal portion.

In the liquid crystal display device according to the embodiment of the present invention, the guide panel is white or silver.

In the liquid crystal display device according to an embodiment of the present invention, the lower surface of the horizontal portion is white or silver.

In the liquid crystal display device according to an embodiment of the present invention, the lower surface and the inner surface of the horizontal portion are white or silver.

In the liquid crystal display device according to an embodiment of the present invention, the optical sheets include a diffusion sheet and at least one prism sheet.

In the liquid crystal display device according to the embodiment of the present invention, the vertical part and the horizontal part are perpendicular to each other.

A backlight unit and a liquid crystal display device including the same according to an embodiment of the present invention induce light conversion from blue light to white light by using optical recycling between a white guide panel, a quantum dot film, a reflective sheet, and a light guide plate, So that the phenomenon of being recognized can be solved.

1 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.
2 is a view showing a structure in which a quantum dot film and an optical sheet are laminated according to an embodiment of the present invention.
Fig. 3 is a sectional view of the guide panel cut in AB in Fig. 1. Fig.
4 is a side view of the quantum dot film.
Fig. 5 is a sectional view taken along the line AB in Fig. 1, showing the arrangement relationship between the guide panel and the quantum dot film.
FIG. 6 is a sectional view of a backlight unit according to an embodiment of the present invention, which is cut along line AB of FIG.
Fig. 7 is an enlarged view of the dotted line portion of Fig. 6 taken along AB in Fig.
FIG. 8 is a view showing a liquid crystal display device in which blue light is leaked and visually recognized, and FIG. 9 is a view showing a liquid crystal display device in which the phenomenon of leakage of blue light is improved.

Hereinafter, a backlight unit according to an embodiment of the present invention and a liquid crystal display device including the same will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

1 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.

1, the liquid crystal display device 10 may include a liquid crystal panel 700, a backlight unit 10, a guide panel 500, a bottom cover 300, and a top case 1000.

The liquid crystal panel 700 may serve to represent an image and the liquid crystal panel 700 may include a first substrate 710 and a second substrate 720 which are bonded to each other with a liquid crystal layer interposed therebetween .

At this time, although not shown, a plurality of gate lines and data lines cross each other on the inner surface of the first substrate 710, which is called a lower substrate or an array substrate, to define pixels.

Thin film transistors (TFTs) are formed at the intersections of the gate lines and the data lines, respectively, and are connected to the corresponding pixel electrodes. On the inner surface of the second substrate 720 called an upper substrate or a color filter substrate, a color filter of red, green, and blue is formed as an example corresponding to each pixel.

According to the driving method of the liquid crystal which is one of the core materials of the liquid crystal display device, it is divided into three kinds of TN, IPS and VA. In the case of TN (Twisted Nematic), which is first commercialized, a liquid crystal device is twisted in a liquid crystal panel and the liquid crystal is in a horizontal state, and when power is supplied, the liquid crystal moves vertically. The TN system has the simplest structure and has a good response speed, but has a disadvantage in that it has limitations in view angle. IPS (In-Plane Switching) and VA (Vertical Alignment) have been developed to improve this. In the case of the IPS system, the liquid crystal molecules are arranged horizontally while the molecules of the liquid crystal molecules are arranged vertically in the VA system. In the IPS mode, liquid crystal molecules in the horizontal direction are rotated sideways using a magnetic field. IPS system can be widely used in professional and advanced liquid crystal display devices of 18 inches or more because it has excellent transmittance uniformity and can obtain a wide viewing angle without using an optical film. However, there is a disadvantage in that the contrast ratio is low due to the phenomenon of light leakage compared with other methods. In the VA mode, when the power is not supplied, the liquid crystal molecules are vertical, and when the power is turned on, the liquid crystal molecules are driven in a horizontal direction, and the contrast ratio is good. However, there is a disadvantage that the response speed is lower than other methods.

In addition, a black matrix is provided to cover the non-display elements of the first substrate 710 such as a gate line, a data line, and a thin film transistor.

Here, when the liquid crystal display device 20 is driven in the vertical electric field mode, a common electrode covering the color filter and the black matrix may be formed on the second substrate 720. A polarizing plate (not shown) selectively transmitting only specific light may be attached to the outer surfaces of the first and second substrates 710 and 720, respectively.

The printed circuit board 740 may be connected to at least one edge of the liquid crystal panel 700 via a connection member 730 such as a flexible circuit board or a tape carrier package (TCP).

At this time, the printed circuit board 740 may be brought into close contact with the side surface of the guide panel 500 or the back surface of the bottom cover 300 during the modularization process.

The backlight unit 10 is positioned on the back surface of the liquid crystal panel 700 and may serve to supply light to the liquid crystal panel 700.

For this, the backlight unit 10 includes an LED assembly 900, a white or silver reflective sheet 400, a light guide plate 600 seated on the reflective sheet 400, and a quantum dot film A Quantum Dot Enhancement Film (QDEF, 100) and a plurality of optical sheets 200.

In particular, the quantum dot film 100 is a film capable of converting blue light into white light using quantum dots.

A quantum dot is one of the nano materials, and the quantum dot may include a core nanocrystal and a shell nanocrystal surrounding the core nanocrystal.

In addition, the quantum dot may include an organic ligand bound to the shell nanocrystal.

In addition, the quantum dot may include an organic coating layer surrounding the shell nanocrystals.

The shell nanocrystals may be formed of two or more layers.

The shell nanocrystals are formed on the surface of the core nanocrystals.

The quantum dot may convert the wavelength of the light incident on the core core crystal into a long wavelength through the shell nanocrystals forming the shell layer and increase the light efficiency.

The quantum dot may include at least one of a group II compound semiconductor, a group III compound semiconductor, a group V compound semiconductor, and a group VI compound semiconductor.

More specifically, the core nanocrystals may include Cdse, InGaP, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe or HgS.

The shell nanocrystals may include CuZnS, CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe or HgS.

The diameter of the quantum dot may be 1 nm to 10 nm.

The wavelength of light emitted from the quantum dots can be controlled by the size of the quantum dots or the molar ratio of the molecular cluster compound and the nanoparticle precursor in the synthesis process.

The organic ligand may include pyridine, mercapto alcohol, thiol, phosphine, phosphine oxide, and the like.

The organic ligands serve to stabilize unstable quantum dots after synthesis.

After synthesis, a dangling bond is formed on the outer periphery, and the quantum dots may become unstable due to the dangling bonds. However, one end of the organic ligand is in an unbonded state, and one end of the unbound organic ligand bonds with the dangling bond, thereby stabilizing the quantum dot.

Particularly, when the quantum dot has a size smaller than the Bohr radius of an exciton formed by electrons and holes excited by light, electricity or the like, a quantum confinement effect is generated to have a staggering energy level and an energy gap The size of the image is changed.

Further, the charge is confined within the quantum dots, so that it has a high luminous efficiency.

Unlike general fluorescent dyes, the quantum dots vary in fluorescence wavelength depending on the particle size.

That is, as the size of the particle becomes smaller, it emits light having a shorter wavelength, and the particle size can be adjusted to produce fluorescence in a visible light region of a desired wavelength.

In addition, since the extinction coefficient is 100 to 1000 times higher than that of a general dye, and the quantum yield is also high, it produces very high fluorescence.

That is, the quantum dot can generate strong fluorescence in a narrow wavelength band.

The light emitted by the quantum dot can be generated by electrons falling from the conduction band to the valence band in an unstable state.

Fluorescence generated at this time has a property that a shorter wavelength of light is generated as the particles of the quantum dot are smaller, and a longer wavelength of light is generated as the particle size is larger. Therefore, by regulating the size of the quantum dots, it is possible to emit light in a visible light region of a desired wavelength.

In addition, when several quantum dots of different sizes are present, it is possible to emit light of a single wavelength and to emit various colors at once.

The quantum dot can be synthesized by a chemical wet process.

Here, the chemical wet method is a method of growing particles by adding a precursor material to an organic solvent, and the quantum dots can be synthesized by a chemical wet method.

Using the above-described characteristics, the quantum dot film 100 can convert the blue light provided from the blue light LED 910 into white light, provide it to the liquid crystal panel 700, and has an advantage of excellent color reproduction rate.

The LED assembly 900 is disposed on one side of the light guide plate 600 so as to face the light incident surface of the light guide plate 600. The LED assembly 900 includes a plurality of LEDs 910 as a light source, 910 may be mounted at a predetermined distance apart from each other.

At this time, the plurality of LEDs 910 emit blue light in front of the light guide plate 600 toward the light incident surface, and the plurality of RGB LEDs 910 can be simultaneously turned on.

The LED 910 may emit ultraviolet light having a wavelength band between about 430 nm and about 470 nm or a wavelength band between about 300 nm and about 400 nm.

The LED assembly 900 may be formed on the other side of the light guide plate 600 and the width of the light guide plate 600 may be narrower than the width of the light guide plate 600. [ Can also be disposed on the short side.

On the other hand, the LED 910 having the LED chip (not shown) emitting B (Blue) color may be used to realize blue light in each LED 910. A plurality of LEDs 910 emitting blue light may be bundled into one cluster and a plurality of LEDs 910 mounted on the PCB 920 may be arranged in a line on the PCB 920. [ They can be arranged side by side or arranged side by side in a plurality of rows.

The PCB 920 may be a metal core printed circuit board (MCPCB) having a heat dissipating function.

That is, by using the metal PCB 920 having a high thermal conductivity, the heat of high temperature generated from the LED 910 can be rapidly discharged to the outside. At this time, when the PCB 920 is formed of MCPCB, an insulating layer (not shown) such as a polyimide resin material for electrical insulation between a core made of a metal and a wiring pattern (not shown) .

The light guide plate 600 may disperse the light emitted from the LED 910 to provide a planar light source to the liquid crystal panel 700. Specifically, the light emitted from the LED 910 is totally reflected in the light guide plate 600 several times. Accordingly, the light is uniformly spread over a wide area of the light guide plate 600, and can be incident on the liquid crystal panel 700 as a surface light source.

At this time, the light guide plate 600 may include, for example, a pattern of a specific shape on the back surface to supply a uniform surface light source to the liquid crystal panel 700. [ The pattern may be formed in various forms such as an elliptical pattern, a polygon pattern, and a hologram pattern in order to guide light incident into the light guide plate 600 .

Such a pattern may be formed on the rear surface of the light guide plate 600 by a printing method or an injection method.

The light guide plate 600 may be formed of PMMA (poly methylmethacrylate), PC (polycarbonate), acrylic, or silicon.

The reflective sheet 400 is positioned on the back surface of the light guide plate 600 and can reflect light passing through the back surface of the light guide plate 600 toward the liquid crystal panel 700 to improve the brightness of light.

A plurality of optical sheets 200 on the light guide plate 600 may be formed by a diffusion sheet 250 and two prism sheets 210 and 230 or a prism sheet in which a pattern is formed in an upward direction, And a prism sheet.

The optical sheet 200 may diffuse or condense light passing through the light guide plate 600 to allow a more uniform surface light source to be incident on the liquid crystal panel 700.

The liquid crystal panel 700 and the backlight unit 10 may be modularized through the top case 1000, the guide panel 500, and the bottom cover 300.

Specifically, the top case 1000 may be formed as a rectangular frame whose cross section is bent in the shape of " a " so as to cover the four sides and sides of the upper surface of the liquid crystal panel 700. [ Further, the front surface of the top case 1000 may be opened so as to display an image realized by the liquid crystal panel 700.

The bottom cover 300 on which the liquid crystal panel 700 and the backlight unit 10 are mounted and which is the basis for assembling the entire structure of the module of the liquid crystal display device 10 may be formed into a single plate- .

The guide panel 500 has a square shape having a horizontal portion 530 in which the liquid crystal panel 700 and the backlight unit 10 are positioned and the horizontal portion 530 on which the liquid crystal panel 700 is mounted. (700) and the edge of the light guide plate (600) of the backlight unit (10).

A region where the LED assembly 900 is fixed by a method such as adhesion may be formed on at least one edge of the guide panel 500. Accordingly, light emitted from the plurality of LEDs 910 of the LED assembly 900 can be confronted with the light incidence surface of the light guide plate 600.

In this case, the top case 1000 may be referred to as a case top or a top cover, and the guide panel 500 may be referred to as a guide panel or a main support or a mold frame. The bottom cover 300 may be referred to as a cover bottom or a bottom cover I will.

The backlight unit 10 having the above-described structure is generally called a side light type, and a plurality of LEDs 910 may be arranged in a plurality of layers on the PCB 920 according to purposes. Also, it is also possible to provide a plurality of LED assemblies 900, respectively, so as to interpose the bottom covers 300 corresponding to each other along both edges of the bottom cover 300 facing each other.

2 is a view showing a structure in which a quantum dot film and an optical sheet are laminated according to an embodiment of the present invention.

(L1, L2, L3) passing through the quantum dot film (100), the first light (L1) is light passing through a region not corresponding to the optical sheet (200) The second light L2 and the third light L3 can be defined as light passing through the region corresponding to the optical sheet 200. [

Some light among the lights L1, L2, and L3 may be converted from blue light to white light while passing through the quantum dot film 100, and some light may not be converted into complete white light.

The second light L2 is defined as the light converted from the blue light to the white light among the lights L2 and L3 passing through the region corresponding to the optical sheet 200 and the third light L3 is converted from the blue light into the complete white light The third light L3 can be converted into complete white light while passing through the optical sheet 200. In this case, That is, even if some of the light passing through the optical sheet 200 and the corresponding quantum dot film 100 can not be converted into complete white light, it can be converted into complete white light while passing through the optical sheet 200. However, since some of the light passing through the region of the quantum dot film 100 that does not correspond to the optical sheet 200 may not be converted into white light, it is necessary to convert such light into white light and provide it to the liquid crystal panel .

According to the embodiment of the present invention, it is possible to effectively convert the blue light passing through the quantum dot film 100 into the white light through the arrangement relationship of the guide panel 500 and the quantum dot film 100.

3 is a sectional view of the guide panel cut along the line A-B in Fig.

Referring to FIG. 3, the guide panel 500 may include a vertical portion 510 and a horizontal portion 530.

The vertical portion 510 and the horizontal portion 530 may be integrally formed in a vertical relationship with each other.

The horizontal portion 530 may protrude from the inner surface of the vertical portion 510.

The vertical portion 510 may include an inner upper surface 517 and an inner lower surface 519 with respect to the outer surface 511, the upper surface 513, the lower surface 515 and the horizontal portion 530 .

The horizontal portion 530 may include an upper surface 531, a lower surface 535, and an inner surface 533.

When the upper surface of the vertical part 510 is defined as a first upper surface 513 in order to distinguish the upper surface and the lower surface of the vertical part 510 and the horizontal part 530, The upper surface may be defined as the second upper surface 531. A lower surface of the horizontal portion 530 may be defined as a second lower surface 535. The lower surface of the vertical portion 510 may be defined as a first lower surface 515.

The guide panel 500 may be made of metal or plastic, and may be white or silver.

That is, the guide panel 500 may be formed to have a high reflectance white color, or a white or silver color material may be applied to the guide panel 500.

Particularly, the entire surface of the guide panel 500 may be white or silver. In the horizontal portion 530 of the guide panel 500, only the lower surface 535 may be white or silver, Only the inner side surface 533 and the lower surface 535 of the horizontal portion 530 of the guide panel 500 may be manufactured to have a white or silver color or a white or silver colored material may be applied to the corresponding region.

4 is a side view of the quantum dot film.

Referring to FIG. 4, the quantum dot film 100 may be divided into a first region 110 and a second region 130 adjacent to the first region.

The first region 110 corresponds to the guide panel 100 and may be defined as an edge region of the quantum dot film 100. The second region 130 may be defined as a region corresponding to the guide panel 100 Area can be defined.

Fig. 5 is a cross-sectional view taken along the line A-B of Fig. 1, showing the arrangement relationship between the guide panel and the quantum dot film.

5, all or a part of the lower surface 535 of the horizontal portion 530 of the horizontal portion 530 of the guide panel 100 is covered with the first region 110 of the quantum dot film 100, .

That is, the guide panel 100 may have a structure for covering the edge region of the quantum dot film 100, specifically, a structure in which the horizontal portion 530 covers the upper edge region of the quantum dot film 100.

The side surface of the quantum dot film 100 may correspond to the inner lower surface 519 of the vertical portion 510 of the guide panel 100.

FIG. 6 is a sectional view of a backlight unit according to an embodiment of the present invention cut along the line A-B in FIG. 1;

6, the backlight unit 10 according to the embodiment of the present invention includes a guide panel 500, a bottom cover 300, a reflective sheet 400 housed in the bottom cover 300, A light guide plate 600 disposed on the upper surface of the light guide plate 400 and a quantum dot film 100 disposed on the upper surface of the light guide plate 600. The optical sheet 200 disposed on the upper surface of the quantum dot film 100, And an upper polarizer 810 and a lower polarizer 830 disposed on a display region of the upper and lower surfaces of the liquid crystal panel 700. The liquid crystal panel 700 includes a liquid crystal panel 710,

A space 30 may be formed between the inner surface 533 of the horizontal portion 530 and the side surface of the optical sheet 200 due to manufacturing tolerances.

It is necessary to prevent blue light that has not been converted into white light from passing through the quantum dot film 100 into the space 30 to pass through the space 30 and be viewed by the viewer.

A fine space 30 may be formed between the inner surface 533 of the horizontal portion 530 and the side surface of the optical sheet 200 even if the manufacturing tolerance is reduced and the blue light Light recycling between the horizontal portion 530 and the quantum dot film 100 can be used.

Fig. 7 is a cross-sectional view taken along the line A-B in Fig. 1, and an enlarged view of the dotted line portion in Fig.

Referring to FIG. 7, light directed toward the region of the quantum dot film 100 that does not correspond to the optical sheet 200 out of the light provided to the quantum dot film 100 from the light guide plate 600, that is, The light directed toward the first substrate 535 is reflected by the lower surface 535 of the horizontal portion 530 and is reflected by the lower surface 535 of the horizontal portion 530 and the first surface 535 of the quantum dot film 100 in one space of the light guide plate 600 Region, and the reflective sheet 400, respectively. Through such optical recycling, blue light is converted into white light, and blue light can be minimized in a space corresponding to manufacturing tolerances between the inner surface 533 of the horizontal portion 530 and the side surface of the optical sheet 200.

Not only the horizontal portion 530 is arranged to cover the edge of the quantum dot film 100 but also the back surface of the horizontal portion 530 is disposed at the edge of the light guide plate 600 and the reflective sheet 400 in order to maximize the optical recycling effect. It is preferable to arrange each structure so as to correspond to the area. In addition, the arrangement relationship of the respective structures can be determined such that the sides of the quantum dot film 100, the light guide plate 600, and the reflective sheet 400 are coplanar.

The blue light emitted from the light guide plate 600 can pass through the quantum dot film 100 by arranging the quantum dot film 100 so as to face the entire upper surface region of the light guide plate 600, 100 may be reflected by the horizontal portion 530 of the guide panel 500 and may be optically cycled or the optical conversion rate from blue light to white light may be maximized while passing through the optical sheets 200.

FIG. 8 is a view showing a liquid crystal display device in which blue light is leaked and blue light is visible at the edge of the liquid crystal panel, and FIG. 9 is a view showing a liquid crystal display device in which the phenomenon of leakage of blue light is improved.

8 and 9, it can be seen that the liquid crystal display device 20 according to the embodiment of the present invention can improve the phenomenon of leakage of blue light by using optical recycling.

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 limitation, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

10. Backlight Unit
20. Liquid crystal display
30. Space
100. Quantum dot film
110. The first zone
120. The second zone
200. Optical sheets
210, 220. A prism sheet
230. Diffusion Sheet
300. Bottom cover
400. Reflective sheet
500. Guide panel
510. Vertical section
511. Outside
513. Top surface
515. Lower surface
517. Inner upper surface
519. Inner bottom surface
530. Horizontal part
531. Top surface
533. My side
535. Lower surface
600. Light guide plate
700. Liquid crystal panel
710. First substrate
720. Second substrate
800. Polarizer
810. Upper polarizer
830. Lower polarizer plate
900. LED assembly
910. LED
920. PCB
1000. Top case

Claims (20)

A guide panel including a vertical portion and a horizontal portion extending from an inner surface of the vertical portion; And
And a quantum dot film including a first region that is an edge region and a second region that is adjacent to the first region,
Wherein the first region corresponds to a lower surface of the horizontal portion. The method according to claim 1,
A light emitting diode disposed on one side of the guide panel; And
And a light guide plate disposed under the quantum dot film and corresponding to the first region. 3. The method of claim 2,
Wherein the light emitting diode emits blue light. The method of claim 3,
The quantum-
And converts the blue light into white light. 3. The method of claim 2,
Further comprising optical sheets disposed on the quantum dot film and corresponding to the second region. 6. The method of claim 5,
And a side surface of the optical sheets facing the inner surface of the horizontal portion. The method according to claim 1,
Wherein the guide panel is white or silver. The method according to claim 1,
And the lower surface of the horizontal portion is white or silver. The method according to claim 1,
And a lower surface and an inner surface of the horizontal portion are white or silver. 6. The method of claim 5,
Wherein the optical sheets include a diffusion sheet and at least one prism sheet. 3. The method of claim 2,
A reflective sheet disposed on a back surface of the light guide plate; And
And a bottom cover for accommodating the light guide plate. The method according to claim 1,
Wherein the vertical portion and the horizontal portion are perpendicular to each other. A guide panel including a vertical portion and a horizontal portion extending from the inner side of the vertical portion,
A quantum dot film comprising a first region that is an edge region and a second region that is adjacent to the first region;
A light emitting diode disposed on one side of the guide panel;
A light guide plate disposed under the quantum dot film and corresponding to the first region;
Optical sheets disposed on the quantum dot film and corresponding to the second region;
A reflective sheet disposed on a back surface of the light guide plate;
A bottom cover for accommodating the light guide plate;
A liquid crystal panel disposed on the optical sheets; And
And a top case surrounding an edge of the liquid crystal panel,
And the first region corresponds to a lower surface of the horizontal portion. 14. The method of claim 13,
The light emitting diode emits blue light,
The quantum-
And converts the blue light into a white light. 14. The method of claim 13,
And the side surfaces of the optical sheets face the inner surface of the horizontal portion. 14. The method of claim 13,
Wherein the guide panel is white or silver. 14. The method of claim 13,
And a lower surface of the horizontal portion is white or silver. 14. The method of claim 13,
And a lower surface and an inner surface of the horizontal portion are white or silver. 14. The method of claim 13,
Wherein the optical sheets include a diffusion sheet and at least one prism sheet. 14. The method of claim 13,
Wherein the vertical portion and the horizontal portion are perpendicular to each other.

Images