KR101862873B1 - Optical member, light emitting device and display device - Google Patents

Abstract

An optical member, a light emitting member, and a display device are disclosed. The optical member comprises a host; A plurality of light conversion particles disposed in the host; And an antioxidant disposed in the host, wherein the antioxidant comprises an amine group and a carboxyl group.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical member, a light emitting device,

Embodiments relate to an optical member, a light emitting device, and a display device.

Recently, flat panel display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), and an organic light emitting diode (OLED) have been developed in place of the conventional CRT.

The liquid crystal display device includes a thin film transistor substrate, a color filter substrate, and a liquid crystal display panel in which liquid crystal is injected between both substrates. Since the liquid crystal display panel is a non-light emitting device, a backlight unit for supplying light to the bottom surface of the thin film transistor substrate is positioned. The amount of light irradiated from the backlight unit is adjusted according to the alignment state of the liquid crystal.

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.

In order to overcome this problem, a quantum dot bar in which a plurality of quantum dots dispersed in a red wavelength or a green wavelength is dispersed is provided in front of a blue LED emitting blue light constituting a backlight unit, Thus, light mixed with blue light, red light and green light by a plurality of quantum dots dispersed in the quantum dot bar is incident on the light guide plate to provide white light.

At this time, when white light is provided to the light guide plate using the quantum dot bar, high color reproduction can be realized.

The backlight unit may include an FPCB (Flexible Printed Circuits Board) for transmitting and supplying LEDs and signals to one side of a blue LED emitting blue light, and an adhesive member may be further provided on the lower surface of the FPCB.

As such, when a light emitted from a blue LED is leaked, a display device for displaying an image in various forms using white light provided to the light guide plate through the quantum dot bar is widely used.

A display device to which such a quantum dot is applied is disclosed in Korean Patent Laid-Open Publication No. 10-2011-0068110.

Embodiments provide an optical member, a light emitting device, and a display device having improved reliability and durability.

An optical member according to an embodiment includes a host; A plurality of light conversion particles disposed in the host; And an antioxidant disposed in the host, wherein the antioxidant comprises an amine group and a carboxyl group.

A light emitting device according to an embodiment includes a light emitting portion; A plurality of light conversion particles disposed in a path of light from the light emitting portion; And an antioxidant disposed adjacent to the photo-conversion particles, wherein the antioxidant comprises an amine group and a carboxyl group.

A display device according to an embodiment includes a light source; A light conversion member on which light from the light source is incident; And a display panel on which light from the light conversion member is incident, the light conversion member comprising: a host; A plurality of light conversion particles disposed in the host; And an antioxidant disposed in the host, wherein the antioxidant comprises an amine group and a carboxyl group.

An optical member according to an embodiment comprises an antioxidant disposed within a host. Accordingly, the optical member according to the embodiment can effectively prevent the oxidation of the photo-conversion particles in the host.

Further, the antioxidant may include an amine group and a carboxyl group. In particular, the antioxidant may comprise a melanin compound. Accordingly, the antioxidant can effectively prevent the photo-conversion particles from being oxidized.

Therefore, the optical member, the light emitting device, and the display device according to the embodiment can have improved reliability and durability.

1 is a perspective view illustrating a light emitting diode package according to an embodiment.
FIG. 2 is a cross-sectional view showing a section cut along AA 'in FIG. 1; FIG.
3 is a cross-sectional view showing the light emitting chip.
4 is an exploded perspective view showing a liquid crystal display device according to an embodiment.
5 is a perspective view showing the light converting member.
6 is a sectional view taken along line BB 'in FIG.
7 is a perspective view showing a light conversion member according to another embodiment.
8 is a cross-sectional view schematically showing a liquid crystal display device according to another embodiment.
9 is an exploded perspective view showing a liquid crystal display device according to another embodiment.
10 is a perspective view showing a light conversion member according to yet another embodiment.
FIG. 11 is a cross-sectional view showing a section cut along CC 'in FIG. 10; FIG.
12 is a sectional view showing the light emitting diode, the light converting member and the light guide plate.
13 is an exploded perspective view showing a liquid crystal display device according to another embodiment.

In the description of the embodiments, it is described that each substrate, frame, sheet, layer or pattern is formed "on" or "under" each substrate, frame, sheet, In this case, "on" and "under " all include being formed either directly or indirectly through another element. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is a perspective view illustrating a light emitting diode package according to an embodiment. 2 is a cross-sectional view showing a section taken along the line A-A in Fig. 3 is a cross-sectional view showing the light emitting chip.

1 to 3, a light emitting diode package according to an embodiment includes a body portion 410, a plurality of lead electrodes 421 and 422, a light emitting portion 430, a filling portion 440, Particles 450 and an antioxidant.

The body portion 410 receives the light emitting portion 430, the filling portion 440 and the light conversion particles 450 and supports the lead electrodes 421 and 422.

The body portion 410 may be formed of any one of resin material such as PPA, ceramic material, LCP, SPS, PPS, and silicone. However, the material of the body part 410 is not limited. The body portion 410 may be integrally formed by injection molding or may have a structure in which a plurality of layers are stacked.

The body portion 410 includes a cavity C having an open top. The cavity C may be formed by patterning, punching, cutting, etching or the like with respect to the body 410. In addition, the cavity C may be formed by a metal frame shaped like a cavity C when the body 410 is molded.

The shape of the cavity C may be a cup shape, a concave container shape, or the like. The surface of the cavity C may be formed in a circular shape, a polygonal shape, or a random shape, but is not limited thereto.

The inner surface of the cavity C may be formed as a surface perpendicular or inclined with respect to the bottom surface of the cavity C in consideration of the light distribution angle of the light emitting diode package.

The body portion 410 includes a base portion 411 and a receiving portion 412.

The base portion 411 supports the receiving portion 412. In addition, the base portion 411 supports the lead electrodes 421 and 422. The base portion 411 may have, for example, a rectangular parallelepiped shape.

The receiving portion 412 is disposed on the base portion 411. The cavity (C) is defined by the accommodating portion (412). That is, the cavity C is a groove formed in the accommodating portion 412. The accommodating portion 412 surrounds the periphery of the cavity C. [ The receiving portion 412 may have a closed loop shape when viewed from the top side. For example, the receiving portion 412 may have a wall shape surrounding the cavity C. [

The receiving portion 412 includes an upper surface, an outer surface, and an inner surface 122. The inner surface is an inclined surface inclined with respect to the upper surface.

The lead electrodes 421 and 422 may be implemented as a lead frame, but the present invention is not limited thereto.

The lead electrodes 421 and 422 may be disposed in the body 410 and the lead electrodes 421 and 422 may be electrically spaced from the bottom surface of the cavity C. [ The outer side of the lead electrodes 421 and 422 may be exposed to the outside of the body 410.

The ends of the lead electrodes 421 and 422 may be disposed on one side of the cavity C or on the opposite side of the cavity C. [

The lead electrodes 421 and 422 may be formed of a lead frame, and the lead frame may be formed during the injection molding of the body 410. The lead electrodes 421 and 422 may be, for example, a first lead electrode 421 and a second lead electrode 422.

The first lead electrode 421 and the second lead electrode 422 are spaced apart from each other. The first lead electrode 421 and the second lead electrode 422 are electrically connected to the light emitting unit 430.

The light emitting unit 430 includes at least one light emitting diode chip. For example, the light emitting unit 430 may include a blue light emitting diode chip or a UV light emitting diode chip.

The light emitting unit 430 may be a horizontal type light emitting diode or a vertical type light emitting diode chip. 8, the light emitting portion 430 includes a conductive substrate 431, a light reflecting layer 432, a first conductive semiconductor layer 433, a second conductive semiconductor layer 434, an active layer 435 And a second electrode 436, as shown in FIG.

The conductive substrate 431 is made of a conductive material. The conductive substrate 431 may be formed of the same material as the light reflection layer 432, the first conductive type semiconductor layer 433, the second conductive type semiconductor layer 434, the active layer 435, and the second electrode 436 .

The conductive substrate 431 is connected to the first conductive type semiconductor layer 433 through the light reflection layer 432. That is, the conductive substrate 431 is a first electrode for applying an electrical signal to the first conductive type semiconductor layer 433.

The light reflection layer 432 is disposed on the conductive substrate 431. The light reflection layer 432 reflects light emitted from the active layer 435 upward. The light reflection layer 432 is a conductive layer. Therefore, the light reflecting layer 432 connects the conductive substrate 431 to the first conductive type semiconductor layer 433. [ Examples of the material used for the light reflection layer 432 include metals such as silver and aluminum.

The first conductivity type semiconductor layer 433 is disposed on the light reflection layer 432. The first conductive semiconductor layer 433 has a first conductivity type. The first conductive semiconductor layer 433 may be an n-type semiconductor layer. For example, the first conductive semiconductor layer 433 may be an n-type GaN layer.

The second conductive type semiconductor layer 434 is disposed on the first conductive type semiconductor layer 433. The second conductive semiconductor layer 434 faces the first conductive semiconductor layer 433 and may be a p-type semiconductor layer. The second conductive semiconductor layer 434 may be, for example, a p-type GaN layer.

The active layer 435 is interposed between the first conductive type semiconductor layer 433 and the second conductive type semiconductor layer 434. The active layer 435 has a single quantum well structure or a multiple quantum well structure. The active layer 435 may be formed of a period of an InGaN well layer and an AlGaN barrier layer, or a period of an InGaN well layer and a GaN barrier layer, and the light emitting material of the active layer 435 may have a luminescence wavelength such as a blue wavelength, Wavelength, and the like.

The second electrode 436 is disposed on the second conductive semiconductor layer 434. The second electrode 436 is connected to the second conductive type semiconductor layer 434.

Alternatively, the light emitting portion 430 may be a horizontal LED. At this time, in order to connect the horizontal LED to the first lead electrode 421, additional wiring may be required.

The light emitting portion 430 may be connected to the first lead electrode 421 by a bump or the like and may be connected to the second lead electrode 422 by a wire. In particular, the light emitting portion 430 may be disposed directly on the first lead electrode 421.

The light emitting unit 430 may be connected to the lead electrodes 421 and 422 by a wire bonding method, a die bonding method, a flip bonding method, or the like, but is not limited thereto .

The filling part 440 is formed in the cavity C. The filling part 440 is transparent. The filling part 440 may be made of a material such as silicon or epoxy or a material having a refractive index of 2 or less. The filling part 440 covers the light emitting part 430. The filling part 440 may be in direct contact with the light emitting part 430.

Also, a reflective layer may be formed on the inner surface of the cavity C. The reflective layer may include a material having a high reflective effect, for example, white PSR (Photo Solder Resist) ink, silver (Ag), or aluminum (Al).

The light conversion particles 450 are disposed on a path of light emitted from the light emitting unit 430. For example, the photo-conversion particles 450 may be disposed in the cavity C. The light conversion particles 450 may be disposed adjacent to the light emitting portion 430. The light conversion particles 450 may be disposed in the filling portion 440. More specifically, the light conversion particles 450 can be uniformly dispersed in the filling portion 440. Accordingly, some or all of the light emitted from the light emitting portion 430 may be incident on the light conversion particles 450.

The photo-conversion particles 450 convert the wavelength of the incident light. For example, the light conversion particles 450 may convert blue light incident from the light emitting chip into green light and red light. That is, some of the light conversion particles 450 convert the blue light into green light having a wavelength range of about 500 nm to about 599 nm, and another part of the light conversion particles 450 converts the blue light to about 600 Can be converted into red light having a wavelength band between nm and about 700 nm.

Alternatively, the light conversion particles 450 may convert ultraviolet light incident from the light emitting chip into blue light, green light, and red light. That is, some of the light conversion particles 450 convert the ultraviolet light to blue light having a wavelength range of about 400 nm to about 499 nm, and another part of the light conversion particles 450 converts the ultraviolet light to about 500 Can be converted into green light having a wavelength band between nm and about 599 nm. Further, another part of the light conversion particles 450 may convert the ultraviolet light into red light having a wavelength range of about 600 nm to about 700 nm.

The photoconversion particles 450 receive the light emitted from the light emitting unit 430 and convert the wavelength. As described above, the blue light incident on the light conversion particles 450 can be converted into green light and red light.

The light conversion particles 450 may convert ultraviolet light emitted from the light emitting unit 430 into blue light, green light, and red light.

Accordingly, white light can be formed by the light converted by the light conversion particles 450 and the light not converted. That is, the blue light, the green light, and the red light may be combined to emit white light.

The photo-conversion particles 450 may be a plurality of quantum dots (QDs). As shown in FIG. 2, 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 the light emitted from the quantum dot can be adjusted according to the size of the quantum dot. For example, a quantum dot having a small diameter can convert incident light into light having a relatively short wavelength band, and quantum dots having a large diameter can convert incident light into light having a relatively large wavelength band.

The ligand may be bonded to the quantum dot. More specifically, one end of the ligand may be bonded to the quantum dot. Further, the ligand surrounds the periphery of the quantum dot. More specifically, one end of the ligand may be bonded to the outer surface of the quantum dot to surround the quantum dot.

In addition, the ligand serves 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 ligand is in an unbonded state, and one end of the unbonded ligand can bond with the dangling bond to stabilize the quantum dot.

The ligand may include pyridine, mercapto alcohol, thiol, phosphine or phosphine oxide, and the like. The ligand may also include polyethyleneimine, 3-aminopropyltrimethoxysilane, mercaptoacetic acid, 3-mercaptopropyltrimethoxysilane or 3-mercaptopropionic acid, and the like. have. In addition, various hydrophilic organic ligands can be used as the ligand.

Alternatively, a hydrophobic organic ligand can be used as the ligand.

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.

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.

The photo-conversion particles 450 may be nanoparticles containing compound semiconductors. That is, the photo-conversion particles 450 may have a diameter of several nm to several tens nm and may include a group II-VI compound semiconductor.

The photo-conversion particles 450 may be hydrophilic or hydrophobic. More specifically, when the ligand has hydrophilicity, the photoconversion particles 450 may have hydrophilicity. When the ligand has hydrophobicity, the photoconversion particles 450 may have hydrophobicity.

The antioxidant may be disposed adjacent to the photo-conversion particles 450. The antioxidant is disposed in the filling part (440). The antioxidant may be uniformly dispersed in the filling part 440. The antioxidant may be chemically bonded to the polymer constituting the filling part 440.

The antioxidant may be included in a proportion of about 0.05 wt% to about 0.15 wt% with respect to the filling part 440.

The antioxidant may include an amine group and a carboxyl group. At this time, the amine group and the carboxyl group may be bonded to each other.

The antioxidant may be represented by the following formula (1).

Formula 1

Here, R 1 may be hydrogen, an aryl group, an alkyl group having 1 to 30 carbon atoms, a heteroaryl group, or halogen.

The antioxidant may be represented by the following formula (2).

(2)

Here, R 2, R 3, R 4 and R 5 may each be hydrogen, an aryl group, an alkyl group having 1 to 30 carbon atoms, a heteroaryl group, a cyano group or a halogen.

Further, the antioxidant may be a melanin compound. More specifically, the antioxidant may be selected from peomelanine or eumelanin.

The antioxidant may be represented by the following formula (3).

(3)

The antioxidant may be represented by the following chemical formula (4).

Formula 4

As described above, the light emitting diode package according to the embodiment includes the antioxidant disposed in the filling portion 440. Accordingly, the light emitting diode package according to the embodiment can effectively prevent oxidation of the photo-converted particles 450.

Further, the antioxidant may include an amine group and a carboxyl group. In particular, the antioxidant may comprise a melanin compound. Accordingly, the antioxidant can effectively prevent the photoconversion particles 450 from being oxidized.

Therefore, the light emitting diode package according to the embodiment can have reliability and durability.

4 is an exploded perspective view showing a liquid crystal display device according to an embodiment. 5 is a perspective view showing the light converting member. 6 is a cross-sectional view taken along line B-B 'in FIG. 7 is a perspective view showing a light conversion member according to another embodiment. 8 is a cross-sectional view schematically showing a liquid crystal display device according to another embodiment. In the description of this liquid crystal display device, the description of the light emitting diode package of the foregoing embodiments will be referred to. That is, with the exception of the modified portions, the description of the prior photo-conversion photo-conversion complex can be essentially combined with the description of this embodiment.

4 to 8, a liquid crystal display device according to an embodiment includes a backlight unit 10 and a liquid crystal panel 20.

The backlight unit 10 emits light to the liquid crystal panel 20. The backlight unit 10 is a surface light source and can uniformly irradiate the bottom surface of the liquid crystal panel 20 with light.

The backlight unit 10 is disposed under the liquid crystal panel 20. The backlight unit 10 includes a bottom cover 100, a light guide plate 200, a reflective sheet 300, a light source such as a plurality of light emitting diodes 400, a printed circuit board 401, (500).

The bottom cover 100 has a top opened shape. The bottom cover 100 accommodates the light guide plate 200, the light emitting diodes 400, the printed circuit board 401, the reflection sheet 300, and the optical sheets 500.

The light guide plate 200 is disposed in the bottom cover 100. The light guide plate 200 is disposed on the reflective sheet 300. The light guide plate 200 emits light upward from the light emitting diodes 400 through total reflection, refraction and scattering.

The reflective sheet 300 is disposed under the light guide plate 200. More specifically, the reflective sheet 300 is disposed between the light guide plate 200 and the bottom surface of the bottom cover 100. The reflective sheet 300 reflects light emitted from the lower surface of the light guide plate 200 upward.

The light emitting diodes 400 are light sources for generating light. The light emitting diodes 400 are disposed on one side of the light guide plate 200. The light emitting diodes 400 generate light and enter the light guide plate 200 through the side surface of the light guide plate 200.

The light emitting diodes 400 may be a blue light emitting diode for generating blue light or a UV light emitting diode for generating ultraviolet light. That is, the light emitting diodes 400 may emit blue light having a wavelength range of about 430 nm to about 470 nm or ultraviolet light having a wavelength band of about 300 nm to about 400 nm.

The light emitting diodes 400 are mounted on the printed circuit board 401. The light emitting diodes 400 are disposed under the printed circuit board 401. The light emitting diodes 400 are driven by receiving a drive signal through the printed circuit board 401.

The printed circuit board 401 is electrically connected to the light emitting diodes 400. The printed circuit board 401 may mount the light emitting diodes 400. The printed circuit board (401) is disposed inside the bottom cover (100).

The optical sheets 500 are disposed on the light guide plate 200. The optical sheets 500 change or enhance the characteristics of light emitted from the upper surface of the light guide plate 200 and supply the light to the liquid crystal panel 20. [

The optical sheets 500 may be a light conversion member 501, a diffusion sheet 502, a first prism sheet 503, and a second prism sheet 504. [

The light conversion member 501 may be disposed on the light path between the light source 300 and the liquid crystal panel 20. For example, the light conversion member 501 may be disposed on the light guide plate 200. More specifically, the light conversion member 501 may be interposed between the light guide plate 200 and the diffusion sheet 502. The light conversion member 501 can convert the wavelength of the incident light and emit the light upward.

For example, when the light emitting diodes 400 are a blue light emitting diode, the light converting member 501 may convert blue light emitted upward from the light guide plate 200 into green light and red light. That is, the light conversion member 501 converts a part of the blue light into green light having a wavelength band of about 500 nm to about 600 nm, and converts the other part of the blue light to a light having a wavelength range of about 600 nm to about 700 nm It can be converted into red light.

Accordingly, light passing through the light conversion member 501 without conversion and light converted by the light conversion member 501 can form white light. That is, the blue light, the green light, and the red light may be combined, and the white light may be incident on the liquid crystal panel 20.

That is, the photo-conversion member 501 is an optical member that converts the characteristics of the incident light. The photo-conversion member 501 has a sheet shape. That is, the photo-conversion member 501 may be an optical sheet.

5 and 6, the photo-conversion member 501 includes a lower substrate 510, an upper substrate 520, a photo-conversion layer 530, and a sealing portion 540.

The lower substrate 510 is disposed under the light conversion layer 530. The lower substrate 510 is transparent and flexible. The lower substrate 510 may be in close contact with the lower surface of the light conversion layer 530.

Examples of the material used for the lower substrate 510 include transparent polymers such as polyethylene terephthalate (PET) and the like.

The upper substrate 520 is disposed on the light conversion layer 530. The upper substrate 520 is transparent and flexible. The upper substrate 520 may be in close contact with the upper surface of the light conversion layer 530.

Examples of materials used for the upper substrate 520 include transparent polymers such as polyethylene terephthalate.

The lower substrate 510 and the upper substrate 520 sandwich the light conversion layer 530. The lower substrate 510 and the upper substrate 520 support the light conversion layer 530. The lower substrate 510 and the upper substrate 520 protect the light conversion layer 530 from external physical impacts. The lower substrate 510 and the upper substrate 520 may be in direct contact with the light conversion layer 530.

In addition, the lower substrate 510 and the upper substrate 520 have low oxygen permeability and moisture permeability. Accordingly, the lower substrate 510 and the upper substrate 520 can protect the light conversion layer 530 from external chemical impacts such as moisture and / or oxygen.

The light conversion layer 530 is interposed between the lower substrate 510 and the upper substrate 520. The light conversion layer 530 may be in close contact with the upper surface of the lower substrate 510 and may be in close contact with the lower surface of the upper substrate 520.

The light conversion layer 530 includes a host 531 and a plurality of light conversion particles 532.

The host 531 surrounds the photo-conversion particles 532. That is, the host 531 uniformly disperses the light-converted particles 532 therein. The host 531 is transparent. That is, the host 531 may be formed of a transparent polymer.

The host 531 is disposed between the lower substrate 510 and the upper substrate 520. The host 531 may be in close contact with the upper surface of the lower substrate 510 and the lower surface of the upper substrate 520.

The host 531 may include an acrylic resin, an epoxy resin, or a silicone resin.

The photo-conversion particles 532 are disposed between the lower substrate 510 and the upper substrate 520. More specifically, the photo-conversion particles 532 are uniformly dispersed in the host 531, and the host 531 may be disposed between the lower substrate 510 and the upper substrate 520. The photo-conversion particles 532 may be dispersed in the host 531 at a concentration of about 0.5 wt% to about 5 wt%.

An antioxidant is disposed in the host 531. The antioxidant is disposed adjacent to the photo-conversion particles 532. The antioxidant may be substantially the same as the antioxidant in the light emitting diode package described above.

The antioxidant may be included in the host 531 at a ratio of about 0.05 wt% to about 0.15 wt%. The antioxidant may be uniformly dispersed throughout the host 531 as a whole.

Alternatively, the antioxidant may be non-uniformly included in the host 531.

As shown in FIGS. 7 and 8, the photo-conversion member 501 may include a central region CR and an outer region OR. In particular, the host 531 may be divided into the central region CR and the outer region OR.

The central region (CR) is defined in the central portion of the light conversion member (501). The center region CR may correspond to an effective display region ADR of the liquid crystal panel 20. [ The effective display area ADR is an area in which an image is displayed.

The outer region OR surrounds the periphery of the central region CR. The outer area OR may be defined as a closed loop shape. The outer area OR may correspond to the ineffective display area NDR of the liquid crystal panel 20. [

The antioxidant may be mainly included in the outer region (OR). That is, the concentration of the antioxidant in the outer region (OR) may be higher than the concentration of the antioxidant in the central region (CR). More specifically, the antioxidant may be contained only in the outer region (OR).

The antioxidant may have a color. In particular, when the antioxidant is a melanin compound, the antioxidant may have a color. Accordingly, the central region CR through which light mainly passes contains a low concentration of the antioxidant, and thus can have a high transmittance. In addition, even if the outer region OR contains the antioxidant at a high concentration, it does not affect the overall optical characteristics of the light conversion member 501.

Also, oxygen or the like may be introduced into the light conversion member 501 from the outside. At this time, since the antioxidant is mainly included in the outer region OR, the photo-conversion member 501 can effectively block oxygen, and can have improved reliability and durability.

The photo-conversion member 501 may be formed by the following process.

First, a resin composition containing quantum dots is formed. At this time, the photovoltaic particles 532 and the antioxidant are uniformly dispersed in the resin composition.

Thereafter, the resin composition is uniformly coated on the lower substrate 510 and cured by heat and / or light. Accordingly, a light conversion layer 530 is formed on the lower substrate 510.

Then, the upper substrate 520 is laminated on the light conversion layer 530, and a sealing portion is formed. Accordingly, the light conversion member 501 can be formed.

The sealing portion 540 is disposed on the side of the light conversion layer 530. More specifically, the sealing portion 540 covers the side surface of the light conversion layer 530. More specifically, the sealing portion 540 is disposed on the side surfaces of the lower substrate 510 and the upper substrate 520. More specifically, the sealing portion 540 covers the side surfaces of the lower substrate 510 and the upper substrate 520.

The sealing portion 540 may be adhered to the side surfaces of the light conversion layer 530, the lower substrate 510, and the upper substrate 520. The sealing portion 540 is in close contact with the side surfaces of the light conversion layer 530, the lower substrate 510, and the upper substrate 520.

Accordingly, the sealing portion 540 can seal the side surface of the light conversion layer 530. That is, the sealing portion 540 is a protecting portion that protects the light conversion layer 530 from external chemical impact.

Further, the light conversion member 501 may further include a first inorganic protective film and a second inorganic protective film. The first inorganic protective film may be coated on the lower surface of the lower substrate 510 and the second inorganic protective film may be coated on the upper surface of the upper substrate 520. Examples of the material used as the first inorganic protective film and the second inorganic protective film include silicon oxide and the like.

The diffusion sheet 502 is disposed on the light conversion member 501. The diffusion sheet 502 improves the uniformity of light passing therethrough. The diffusion sheet 502 may include a plurality of beads 32.

The first prism sheet 503 is disposed on the diffusion sheet 502. The second prism sheet 504 is disposed on the first prism sheet 503. The first prism sheet 503 and the second prism sheet 504 increase the straightness of light passing therethrough.

The liquid crystal panel 20 is disposed on the optical sheets 500. Further, the liquid crystal panel 20 is disposed on the panel guide 23. The liquid crystal panel 20 may be guided by the panel guide 23.

The liquid crystal panel 20 displays an image by adjusting the intensity of light passing through the liquid crystal panel 20. That is, the liquid crystal panel 20 is a display panel for displaying an image using light emitted from the backlight unit 10. [ The liquid crystal panel 20 includes a TFT substrate 21, a color filter substrate 22, and a liquid crystal layer interposed between the two substrates. In addition, the liquid crystal panel 20 includes polarizing filters.

Although not shown in detail in the drawings, the TFT substrate 21 and the color filter substrate 22 will be described in detail. The TFT substrate 21 defines pixels by intersecting a plurality of gate lines and data lines, A thin film transistor (TFT) is provided for each region and is connected in a one-to-one correspondence with the pixel electrodes mounted on the respective pixels. The color filter substrate 22 includes color filters of R, G and B colors corresponding to the respective pixels, a black host 531 for covering the gate lines, the data lines and the thin film transistors, etc., And includes a common electrode.

A driving PCB 25 for supplying a driving signal to the gate line and the data line is provided at the edge of the liquid crystal panel 20.

The drive PCB 25 is electrically connected to the liquid crystal panel 20 by a chip on film (COF) 24. Here, the COF 24 may be changed to a TCP (Tape Carrier Package).

As described above, in the embodiment, the liquid crystal display device can have improved reliability and durability by using the above-mentioned antioxidant.

9 is an exploded perspective view showing a liquid crystal display device according to another embodiment. 10 is a perspective view showing a light conversion member according to yet another embodiment. 11 is a cross-sectional view showing a section cut along the line C-C 'in FIG. 12 is a sectional view showing the light emitting diode, the light converting member and the light guide plate. In the description of this embodiment, the description of the foregoing embodiment will be made. That is, the description of the above-described liquid crystal display device can be essentially combined with the description of the present liquid crystal display device except for the changed portions.

9 to 12, the light conversion member 600 is interposed between the light emitting diodes 400 and the light guide plate 200.

The light-converting member 600 may have a shape elongated in one direction. More specifically, the light conversion member 600 may have a shape extending along one side of the light guide plate 200. More specifically, the light conversion member 600 may have a shape extending along the incident surface of the light guide plate 200.

The light conversion member 600 receives the light emitted from the light emitting diodes 400 and converts the wavelength. For example, the light conversion member 600 may convert blue light emitted from the light emitting diodes 400 into green light and red light. That is, the light conversion member 600 converts a part of the blue light into green light having a wavelength band of about 520 nm to about 560 nm, and converts the other part of the blue light to a light having a wavelength range of about 630 nm to about 660 nm It can be converted into red light.

Accordingly, the light passing through the light conversion member 600 and the light converted by the light conversion member 600 can form white light. That is, the blue light, the green light, and the red light may be combined, and the white light may be incident on the light guide plate 200.

The light conversion member 600 includes a lower substrate 610, an upper substrate 620, a light conversion layer 630, and a sealing portion 640.

The lower substrate 610 is disposed under the light conversion layer 630. The lower substrate 610 is transparent and flexible. The lower substrate 610 may be in close contact with the lower surface of the light conversion layer 630.

The upper substrate 620 is disposed on the light conversion layer 630. The upper substrate 620 is transparent and flexible. The upper substrate 620 may be in close contact with the upper surface of the light conversion layer 630.

The lower substrate 610 is opposed to the light emitting diodes 400. That is, the lower substrate 610 is disposed between the light emitting diodes 400 and the light conversion layer 630. Further, the upper substrate 620 faces the light guide plate 200. That is, the upper substrate 620 is interposed between the light conversion layer 630 and the light guide plate 200.

The lower substrate 610 and the upper substrate 620 sandwich the light conversion layer 630. The sealing portion 640 covers the side surface of the light conversion layer 630. The lower substrate 610 and the upper substrate 620 support the light conversion layer 630. In addition, the lower substrate 610, the upper substrate 620, and the sealing portion 640 protect the light conversion layer 630 from external physical impact and chemical impact.

In the liquid crystal display device according to the present embodiment, the light conversion layer 630 has a relatively small size. Therefore, in manufacturing the liquid crystal display device according to the present embodiment, a small amount of the light conversion particles can be used.

Therefore, the liquid crystal display according to the present embodiment can be easily manufactured at a low cost, by reducing the use of the light conversion particles 532.

13 is an exploded perspective view showing a liquid crystal display device according to another embodiment. In the description of the present embodiment, the description of the preceding embodiments will be made. That is, the description of the preceding liquid crystal display devices can be essentially combined with the description of the present liquid crystal display device except for the changed portions.

Referring to FIG. 13, the liquid crystal display according to the present embodiment includes a plurality of light converting members 700. The light conversion members 700 correspond to the light emitting diodes 400, respectively.

In addition, the light conversion members 700 are disposed between the light emitting diodes 400 and the light guide plate 200. That is, each light conversion member 600 is disposed between the corresponding light emitting diode and the light guide plate 200.

The light conversion members 700 may have a wider planar area than the light emitting diodes 400. Accordingly, most of the light emitted from each light emitting diode can be incident on the corresponding photo-conversion member 600.

The light conversion members 700 include a lower substrate 710, an upper substrate 720, a light conversion layer 730, and a sealing portion 640.

The features of the lower substrate 710, the upper substrate 720, the light conversion layer 730, and the sealing portion 640 may be substantially the same as those described in the embodiments described above.

In the liquid crystal display device according to the present embodiment, the light conversion layer 730 has a relatively small size. Therefore, in manufacturing the liquid crystal display device according to the present embodiment, a small amount of the light conversion particles can be used.

Therefore, the liquid crystal display according to the present embodiment can be easily manufactured at a low cost, by reducing the use of the light conversion particles 532.

In addition, the characteristics of the light-converting member 700 can be modified to match the corresponding light-emitting diode 400. Accordingly, the liquid crystal display device according to the embodiment can have improved reliability, brightness, and uniform color reproducibility.

In addition, the features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (11)

Host;
A plurality of light conversion particles disposed in the host; And
An antioxidant disposed within said host,
Wherein the antioxidant comprises an amine group and a carboxyl group,
Wherein the antioxidant is represented by the following formula (3).
(3)

Host;
A plurality of light conversion particles disposed in the host; And
An antioxidant disposed within said host,
Wherein the antioxidant comprises an amine group and a carboxyl group,
Wherein the antioxidant is represented by the following formula (4).
Formula 4

3. The method according to claim 1 or 2,
Wherein the photo-conversion particles comprise quantum dots. A light emitting portion;
A plurality of light conversion particles disposed in a path of light from the light emitting portion; And
An antioxidant disposed adjacent to said photo-conversion particles,
Wherein the antioxidant comprises an amine group and a carboxyl group
Wherein the antioxidant is represented by the following formula (3).
(3)

A light emitting portion;
A plurality of light conversion particles disposed in a path of light from the light emitting portion; And
An antioxidant disposed adjacent to said photo-conversion particles,
Wherein the antioxidant comprises an amine group and a carboxyl group
Wherein the antioxidant is represented by the following formula (4).
Formula 4

The method according to claim 4 or 5,
Wherein the light conversion particles comprise quantum dots. Light source;
A light conversion member on which light from the light source is incident; And
And a display panel on which light from the photo-conversion member is incident,
The light conversion member
Host;
A plurality of light conversion particles disposed in the host; And
An antioxidant disposed within said host,
Wherein the antioxidant comprises an amine group and a carboxyl group,
The host
A central region corresponding to an effective display region of the display panel; And
And an outer region surrounding the central region,
Wherein the concentration of the antioxidant in the outer region is higher than the concentration of the antioxidant in the central region. 8. The method of claim 7,
Wherein the antioxidant is represented by the following formula (3).
(3)

8. The method of claim 7,
Wherein the antioxidant is represented by the following formula (4).
Formula 4

8. The method of claim 7,
Wherein the photo-conversion particles comprise quantum dots. delete

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