KR20160034481A - Backlight Unit and Liquid Crystal Display Device having the same - Google Patents

Abstract

The present invention discloses a backlight unit and a liquid crystal display device having the same. The disclosed backlight unit includes: a light source; a light guide plate converting an incident light from the light source into a surface light source; a light emitting sheet including a quantum dot disposed in an upper portion of the light guide plate; an optical sheet disposed in an upper portion of the light emitting sheet ; and a reflector disposed underneath the light guide plate. A protective film including a layer made of an inorganic material is attached on a side of a circumference of the light emitting sheet. The backlight unit and the liquid crystal display device having the same can prevent the light emitting sheet disposed to realize high transmittance from being damaged by external moisture or oxygen.

Description

BACKLIT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE Having the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD), and more particularly, to a backlight unit and a liquid crystal display having the same that prevent damage to a light emitting sheet including a quantum dot and a phosphor.

Recently, liquid crystal display devices have been attracting attention as next generation advanced display devices with low power consumption, good portability, and high value-added.

Of these liquid crystal display devices, an active matrix type liquid crystal display device having a thin film transistor, which is a switching device capable of controlling voltage on and off for each pixel, .

In general, a liquid crystal display device forms an array substrate and a color filter substrate through an array substrate manufacturing process for forming thin film transistors and pixel electrodes, and a color filter substrate manufacturing process for forming color filters and common electrodes, And a liquid crystal interposed therebetween.

However, since the liquid crystal display device 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 surface of the liquid crystal display panel do.

The backlight unit is divided into a direct type and an edge type according to the position of the light source. The backlight unit of the direct-type type arranges the light source below the liquid crystal display panel, The backlight unit of the side-type type has a structure in which a light guide plate is disposed under the liquid crystal display panel and a light source is disposed on at least one side surface of the light guide plate to emit light from the light source by using refraction and reflection in the light guide plate And the light is indirectly supplied to the liquid crystal display 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.

In addition, a plurality of optical sheets are disposed between the light guide plate and the liquid crystal display panel of the backlight unit. Recently, a light emitting sheet including a quantum dot is additionally disposed to improve the transmittance of light generated from the light source.

The light emitting sheet including the quantum dots has a function of forming quantum dots, an inorganic fluorescent material or an organic fluorescent material together with a light emitting auxiliary material to absorb light emitted from the light guiding plate and then emitting light.

Therefore, when the light emitted from the actual light guide plate passes through the light emitting sheet having the quantum dots, it is supplied to the liquid crystal display panel without loss of brightness.

However, since the light emitting sheet including the quantum dots is formed in a structure in which the quantum dots and the light emitting layer including the fluorescent material are formed between the two base substrates, the side surface of the light emitting layer is exposed to the outside, There is a vulnerable problem.

FIG. 1 is a view showing a light emitting surface of a liquid crystal display device damaged by a conventional art. Referring to FIG. 1, a liquid crystal display device 10 includes a liquid crystal display panel 20 and a backlight unit Not shown).

In the backlight unit, a light emitting sheet including quantum dots is disposed along with the light guide plate and the optical sheet. As described above, since the light emitting layer is exposed to the outside on the side surface of the light emitting sheet, Damage occurs.

Therefore, as shown in the figure, a dead area A is generated in the liquid crystal display device 10 in which the brightness is drastically reduced along the periphery around the light emitting region of the liquid crystal display panel 20. The dead zone appears to have a width of 3 mm or more over time.

The dead zone A is a region corresponding to the periphery of the light emitting sheet of the backlight unit, and the damage of the light emitting sheet is directly caused by external moisture or oxygen.

It is an object of the present invention to provide a backlight unit and a liquid crystal display device having the backlight unit for preventing damage of the light emitting sheet arranged for high transmittance by external moisture or oxygen.

The present invention also relates to a backlight unit for preventing a light emitting sheet from being damaged due to external moisture and air (oxygen) adhered to a periphery of a light emitting sheet including a quantum dot and a phosphor, and a liquid crystal display There are other purposes to provide.

According to an aspect of the present invention, there is provided a backlight unit comprising: a light source; A light guide plate for converting light incident from the light source into a surface light source; A light emitting sheet including a quantum dot disposed on the light guide plate; An optical sheet disposed on the light emitting sheet; And a reflective plate disposed under the light guide plate, wherein a protective film including a layer made of an inorganic material is attached to a peripheral side of the light emitting sheet.

According to another aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal display panel; A light guide plate for converting light incident from the light source into a planar light source; a light emitting sheet including a quantum dot disposed on the light guide plate; And a backlight unit having a reflective plate disposed under the light guide plate, wherein a protective film including a layer made of an inorganic material is attached to a peripheral side of the light emitting sheet.

INDUSTRIAL APPLICABILITY The backlight unit and the liquid crystal display device provided with the backlight unit of the present invention have an effect of preventing damages caused by external moisture or oxygen to the light emitting sheet arranged for realizing a high transmittance.

Further, the backlight unit and the liquid crystal display device having the same according to the present invention are characterized in that a protective film is attached along the periphery of the light emitting sheet including the quantum dots and the fluorescent material to prevent the light emitting sheet from being damaged due to external moisture and air There is an effect.

1 is a view showing a light emitting surface of a liquid crystal display device in which a light emitting sheet is damaged according to a conventional technique.
2 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.
3A and 3B are views showing the structure of a light emitting sheet used in the backlight unit of the present invention.
4 is a view showing the structure of a protective film attached to the light emitting sheet of the present invention.
5 is a view showing a fastening structure of an optical sheet and a luminescent sheet used in the backlight unit of the present invention.
6 is a graph showing a comparison between a light emitting sheet in the prior art and a dead region in the light emitting sheet of the present invention.
FIGS. 7 to 8C are views showing the structure of light emitting sheets used in a liquid crystal display device according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if a temporal posterior relationship is described by 'after', 'after', 'after', 'before', etc., 'May not be contiguous unless it is used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

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

2, the liquid crystal display 100 includes a liquid crystal display panel 110, a backlight unit 120, a support main body 130 for modularizing the liquid crystal display panel 110 and the backlight unit 120, (150) and a top cover (140).

The liquid crystal display panel 110 and the backlight unit 120 are modularized through a top cover 140, a support main 130 and a bottom cover 150. The top cover 140 is a liquid crystal display In order to cover the top and side edges of the display panel 110, the front surface of the top cover 140 is opened to display an image to be displayed on the liquid crystal display panel 110 .

The lower cover 150, on which the liquid crystal display panel 110 and the backlight unit 120 are mounted and is a basis for assembling the entire structure of the liquid crystal display device, includes a horizontal surface 151 And a side surface 153 whose edge is vertically bent upward.

A square main support main body 130 having a rectangular opening on one side and covering the edges of the liquid crystal display panel 110 and the backlight unit 120 is mounted on the bottom cover 150, And is coupled to the cover 150.

In this case, 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. The bottom cover 150 may be a bottom cover, It is also called.

The liquid crystal display panel 110 is a part that plays a key role in image display and includes an array substrate 112 and a color filter substrate 114 which are bonded to each other with a liquid crystal layer interposed therebetween.

At this time, a plurality of gate lines and data lines intersect to define the pixels on the inner surface of the array substrate 112, which is usually referred to as a lower substrate or a thin film transistor substrate, though not shown in the drawing, A thin film transistor (TFT) is provided at each of the intersections and is connected in one-to-one correspondence with the transparent pixel electrodes formed in each pixel.

On the inner surface of the color filter substrate 114 called an upper substrate, a color filter of red (R), green (G), and blue (B) colors corresponding to each pixel and a color filter A black matrix for covering gate lines, data lines and thin film transistors is provided. In addition, color filters of red (R), green (G), and blue (B) colors and transparent common electrodes covering the black matrix are provided.

However, in the case of the IPS (In-Plane Switching) mode or the FFS (Fringe Field Switching) mode liquid crystal display, the pixel electrode and the common electrode may be disposed in the array substrate 112.

A polarizing plate (not shown) selectively transmitting only specific light is attached to the outer surfaces of the array substrate and the color filter substrates 112 and 114, respectively.

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

In the liquid crystal display panel 110, when the selected thin film transistor is turned on for each gate line by the on / off signal of the gate driving circuit, the signal voltage of the data driving circuit is transmitted to the corresponding pixel electrode through the data line, The alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, resulting in a difference in transmittance.

In addition, the liquid crystal display device according to the present invention includes a backlight unit 120 for supplying light from the backside of the liquid crystal display panel 110 so that the difference in transmittance represented by the liquid crystal display panel 110 is externally expressed.

The backlight unit 120 includes an LED assembly 129, a white or silver reflective plate 125, a light guide plate 123 seated on the reflective plate 125, an optical sheet 121 interposed therebetween, And a light emitting sheet 200 disposed between the light guide plate 121 and the light guide plate 123. The light emitting sheet 200 is formed in a rectangular plate structure similar to the light guide plate 123 or the optical sheet 121, and a protective film 300 is attached along the periphery of the edge.

The protective film 300 functions to block the light emitting layer in which the quantum dot and the fluorescent material are mixed from the outside in the light emitting sheet 200 to prevent the light emitting sheet 200 from being damaged by external moisture or oxygen .

The LED assembly 129 is located at one side of the light guide plate 123 so as to face the light incident surface of the light guide plate 123. The LED assembly 129 includes a plurality of LEDs 129a, And a PCB 129b mounted spaced apart.

The LED assembly 129 is of a top view type in which light emitted from the plurality of LEDs 129a is perpendicular to the PCB 129b.

At this time, the LED 129a is made of a blue LED that emits blue light having a wavelength of about 430 nm to 450 nm to improve luminous efficiency and luminance.

The backlight unit 120 of the present invention uses a blue LED 129a and the light emitting sheet 200 is provided with a green and a red quantum dot, a green phosphor, ) High-transmittance characteristics can be realized by using a light-emitting layer composed of a quantum dot or a red phosphor and a green quantum dot.

The reflection plate 125 is disposed on the back surface of the light guide plate 123 and reflects light passing through the back surface of the light guide plate 123 toward the liquid crystal display panel 110 to improve the brightness of light.

The optical sheet 121 disposed on the light guide plate 123 or the upper portion of the light emitting sheet 200 includes a diffusion sheet and at least one light condensing sheet and the light guide plate 123 and the light emitting sheet 200 And diffused or condensed light passes through the liquid crystal display panel 110 to allow a more uniform surface light source to be incident on the liquid crystal display panel 110.

FIGS. 3A and 3B are views showing the structure of the light emitting sheet used in the backlight unit of the present invention, and FIG. 4 is a diagram showing the structure of the protective film attached to the light emitting sheet of the present invention.

3A to 4, the light emitting sheet 200 of the present invention includes first and second substrates 210 and 211 formed of a transparent insulating material (PET or the like), first and second substrates 210 and 211 And a light emitting layer 213 disposed between the light emitting layer 213 and the light emitting layer 213. First and second buffer layers 212a and 212b are formed between the first substrate 210 and the light emitting layer 213 and between the second substrate 211 and the light emitting layer 213 to protect the light emitting layer 213 do. The first and second buffer layers 212a and 212b may be formed of a barrier layer made of an inorganic material.

The light emitting layer 213 may be composed of first and second quantum dots Q1 and Q2 and a bead B, The first and second quantum dots Q1 and Q2 may be made of semiconductors, alloys or mixed materials thereof of the II-VI, II-III, III-V, III-VI, VI- have.

When the first and second quantum dots Q1 and Q2 are group II-VI of the periodic table, one or more of CdSe, CdS, CdTe, ZnO, ZnSe, ZnS, ZnTe, HgSe, HgTe, CdZnSe, The material may be mixed.

In the case of the III-V group, one or more materials may be mixed with InP, InN, GaN, InSb, InAsP, InGaAs, GaAs, GaP, GaSb, AlP, AlN, AlAs, AlSb, CdSeTe and ZnCdSe .

In the case of the group VI-IV, one of PbSe, PbTe, PbS, PbSnTe, Tl2SnTe5 or two or more materials may be mixed.

The first and second quantum dots Q1 and Q2 may be red quantum dots that generate red light and green dots that generate green light.

In addition, the light emitting layer 213 may be formed by mixing any one of the quantum dots of the first and second quantum dots Q1 and Q2 and the corresponding red or green fluorescent material.

For example, when a red quantum dot is included in the light emitting layer 213, a corresponding green phosphor is mixed. When a green quantum dot is included, a corresponding red phosphor is mixed .

In addition, when green and red quantum dots are mixed in the light emitting layer 213, the LED 129a must use a blue package, and a red quantum dot is formed in the light emitting layer 213 The LED 129a uses a light source containing a blue package and a green fluorescent material and when a green quantum dot is used the LED 129a uses a light source containing a blue package and a red fluorescent material Should be used.

The protective film 300 may be attached to the side surface of the light emitting sheet 200 so that the side surface of the light emitting layer 213 is not exposed to the outside. The protective film 300 may have a structure in which the first to third layers 300a, 300b and 300c are stacked.

The first layer 300a is formed of a transparent insulating material and the third layer 300c may be formed of an adhesive layer so that the protective film 300 can be firmly attached to the light emitting sheet 200. [ Ti, Si, O, and N) or an inorganic material (e.g., Al, Ti, Si, O, N) to prevent oxygen from entering the side of the light emitting layer 213 from outside or from entering moisture between the first and third layers 300a, A second layer 300b formed of a compound of the following formula is formed.

The protective film 300 is partially in contact with the upper and lower surfaces of the light emitting sheet 200 for firm adhesion with the light emitting sheet 200. Therefore, the protective film 300 is attached in a structure that surrounds the side surface of the light emitting sheet 200.

The thickness d3 of the third layer 300c of the protective film 300 directly contacting the light emitting sheet 200 is greater than the thickness of the first or second layer 300a or 300b.

However, if the thickness of the third layer 300c of the protective film 300 is too thick, oxygen or moisture can easily permeate into the light emitting layer 213 of the light emitting sheet 200, .

The thickness d2 of the second layer 300b may be several to several tens of nanometers and the thickness d1 of the first layer 300a may be 5 to 15 micrometers.

Although the second layer 300b formed of an inorganic material is disposed between the first and third layers 300a and 300c in the figure, 300a may be formed as a second layer 300b and the first layer 300a may be formed as a second layer 300b.

As described above, the protective film of the present invention has an effect of preventing the light emitting sheet 200 including quantum dots and the phosphor from being oxidized or damaged by external oxygen or moisture.

Further, when the protective film 300 including the inorganic material layer is attached to the light emitting sheet 200, the peeling phenomenon of the light emitting sheet 200 can be prevented.

Also, when the inorganic material layer is a highly reflective metallic material such as aluminum (Al), the protective film 300 can also function to control reflection and absorption of light emitted from the light guide plate.

5 is a view showing a fastening structure of an optical sheet and a luminescent sheet used in the backlight unit of the present invention.

Referring to FIG. 5 together with FIG. 3A, the light emitting sheet 200 of the present invention is a constituent part of a backlight unit, and is disposed on an upper part of a light guide plate. A plurality of optical sheets 121 are disposed on the light emitting sheet 200 . That is, the light guide plate, the light emitting sheet 200, and the optical sheet 121 are formed in a similar rectangular plate structure, and they are arranged to overlap with each other.

Therefore, the light emitting sheet 200 is fixed to the optical sheet disposed at the bottom of the optical sheet 121 by the fixing means 320. As shown in the drawing, it can be seen that the lower side of the periphery of the optical sheet 121 and the protective film 300 attached to the light emitting sheet 200 are fixed by the fixing means 320.

The light emitting sheet 200 preferably has a function of transmitting the light generated from the light guide plate toward the liquid crystal display panel without loss, and is therefore disposed to overlap with the light guide plate and the optical sheets 121.

Therefore, in the present invention, a fixing means 320 such as a double-sided tape is disposed between the protective film 300 and the optical sheet 121 attached along the periphery of the light emitting sheet 200 to prevent the flow of the liquid crystal display device or the backlight unit The light emitting sheet 200 and the optical sheet 121 are staggered from each other to prevent a decrease in luminance.

6 is a graph showing a comparison between a light emitting sheet in the prior art and a dead region in the light emitting sheet of the present invention.

Referring to FIG. 6, in the case where the protective film of the present invention is not attached to the light emitting sheet including the quantum dot and the fluorescent material as in the prior art, the dead area gradually increases according to the use time (More than 3mm).

However, when the protective film 300 described with reference to FIG. 4 is attached along the side surface of the light emitting sheet, it can be seen that the dead region is stopped within 1 mm according to the use time.

As described above, in the present invention, the light-emitting sheet formed of the material easily oxidized by external moisture and oxygen is shielded from the outside by the protective film, thereby preventing damage due to sheet oxidation and moisture penetration along the circumference of the conventional light- It is effective.

FIGS. 7 to 8C are views showing the structure of light emitting sheets used in a liquid crystal display device according to another embodiment of the present invention.

The light-emitting sheet described in Figs. 7 to 8C is the same as that of the light-emitting sheet described in Figs. 3A to 4, and only the structure of the protective film attached along the side surface of the light- Therefore, reference numerals and contents which are not described refer to Figs. 3A to 4.

Referring to FIG. 7, a light emitting sheet 200 according to another embodiment of the present invention includes first and second substrates 210 and 211, and a light emitting layer 213. First and second buffer layers 212a and 212b are formed between the first substrate 210 and the light emitting layer 213 and between the second substrate 211 and the light emitting layer 213, respectively.

The light emitting layer 213 may include first and second quantum dots Q1 and Q2 and a bead B.

The side surfaces of the first and second substrates 210 and 211, the first and second buffer layers 212a and 212b and the light emitting layer 213 are formed in the same plane on four sides of the light emitting sheet 200. [

In addition, the protective film 400 according to another embodiment of the present invention is formed by stacking the first to third layers 400a, 400b, and 400c.

The first layer 400a of the protective film 400 is formed of a transparent insulating material and the third layer 400c is formed of an adhesive layer so that the protective film 400 can be firmly attached to the light emitting sheet 200 .

Ti, Si, O, N) or a compound thereof (e.g., Al, Ti, Si, O, N) to prevent oxygen from entering the light emitting layer 213 from outside or from penetrating moisture between the first and third layers 400a, A second layer 400b is formed.

The third layer 400c of the protective film 400 according to another embodiment of the present invention is in contact with the side surface of the light emitting sheet 200 and the upper surface of the protective film 400 is, The second substrate 211 of the second substrate 200 is flush with the upper surface of the second substrate 211.

The lower surface of the protective film 400 is attached so as to be flush with the upper surface of the first substrate 210 of the light emitting sheet 200.

As described above, in the light emitting sheet according to another embodiment of the present invention, since the protective film is attached only to the side surface of the light emitting sheet, the light emitting surface of the light emitting sheet can be widened.

8A to 8C, the light emitting sheet 200 according to another embodiment of the present invention includes the first protective film (not shown in FIGS. 3A to 4) on the side surfaces perpendicular to the X-X ' 300, and the second protective film 350 is attached to the side surfaces perpendicular to the Y-Y 'line direction. And may be formed in the opposite case in some cases.

Since the structure and the attaching method of the first protective film 300 are described with reference to FIGS. 3A to 4, the structure and the attaching method of the second protective film 350 will be mainly described.

Referring to FIG. 8C, the lateral surface of the light emitting sheet 200 perpendicular to the Y-Y 'line is formed so that the width of the light emitting layer 213 is narrower than the width of the first and second substrates 210 and 211, 213 are formed on both sides of the first substrate 210 and the second substrate 211.

The second protective film 350 of the present invention has a first protective layer 350a corresponding to a second layer formed of an inorganic material in FIGS. 3A through 4 and a second protective layer 350a stacked with the first protective layer 350a. (350b).

The first passivation layer 350a is coupled to a predetermined groove formed in the light emitting sheet 200 and the second passivation layer 350b is coupled to the first and second substrates 210 and 211 of the light emitting sheet 200. [ And the side surfaces of the first and second buffer layers 212a and 212b and the back surface of the first protective layer 350a.

The first passivation layer 350a of the second passivation film 350 is formed on both side edges of the light emitting layer 213 and on the upper surface of the first substrate 210 and a part of the lower surface of the second substrate 211 .

The upper and lower surfaces of the second passivation layer 350b of the second protective film 350 are flush with the upper surface of the second substrate 211 and the lower surface of the first substrate 210, respectively.

INDUSTRIAL APPLICABILITY The backlight unit and the liquid crystal display device provided with the backlight unit of the present invention have an effect of preventing the light emitting sheet arranged for realizing high transmittance from being damaged by external moisture or oxygen.

Further, the backlight unit and the liquid crystal display device having the same according to the present invention are characterized in that a protective film is attached along the periphery of the light emitting sheet including the quantum dots and the fluorescent material to prevent the light emitting sheet from being damaged due to external moisture and air There is an effect.

100: liquid crystal display device 110: liquid crystal display panel
112: first substrate 114: second substrate
117: printed circuit board 120: backlight unit
121: optical sheet 123: light guide plate
125: reflector 130: support main
200: light emitting sheet 300: protective film

Claims (16)

Light source;
A light guide plate for converting light incident from the light source into a surface light source;
A light emitting sheet including a quantum dot disposed on the light guide plate;
An optical sheet disposed on the light emitting sheet; And
And a reflector disposed under the light guide plate,
Wherein a protective film including a layer made of an inorganic material is attached to the peripheral side surface of the light emitting sheet.
The backlight unit of claim 1, wherein the light source is a blue LED.
The light emitting device according to claim 1,
First and second substrates; And
And a light emitting layer disposed between the first and second substrates and including at least one or more quantum dots.
The backlight unit according to claim 3, wherein the protective film is attached while being in contact with a side surface, an upper surface and a lower surface of the light emitting sheet.
2. The light emitting device of claim 1, wherein the protective film comprises a first layer made of a transparent insulating material, a second layer containing an inorganic material on the first layer, and a third layer disposed on the two layers, .
The backlight unit according to claim 5, wherein the thickness of the third layer is 40 占 퐉 or less.
The backlight unit according to claim 1, wherein the inorganic material is one of aluminum (Al), titanium (Ti), silicon (Si), oxygen (O), and nitrogen (N).
The backlight unit according to claim 1, wherein the light emitting sheet is fixed to the optical sheet by fixing means.
A liquid crystal display panel; And
A light guide plate for converting light incident from the light source into a planar light source; a light emitting sheet including a quantum dot disposed on the light guide plate; And a backlight unit having a reflector disposed under the light guide plate,
Wherein a protective film including a layer made of an inorganic material is attached to the peripheral side of the light emitting sheet.
The liquid crystal display of claim 9, wherein the light source is a blue LED.
The light emitting device according to claim 9,
First and second substrates; And
And a light emitting layer disposed between the first and second substrates and including at least one or more quantum dots.
The liquid crystal display device according to claim 11, wherein the protective film is attached while being in contact with a side surface, an upper surface and a lower surface of the light emitting sheet.
The light emitting device according to claim 9, wherein the protective film comprises a first layer made of a transparent insulating material, a second layer including an inorganic material on the first layer, and a third layer disposed on the two layers, And the liquid crystal display device.
14. The liquid crystal display device according to claim 13, wherein the thickness of the third layer is 40 mu m or less.
The liquid crystal display device according to claim 9, wherein the inorganic material is one of aluminum (Al), titanium (Ti), silicon (Si), oxygen (O), and nitrogen (N).
The liquid crystal display device according to claim 9, wherein the light emitting sheet is fixed to the optical sheet by fixing means.

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