KR101862865B1 - Optical member and display device having the same - Google Patents

Abstract

An optical member and a display device including the same are disclosed. The display device includes a light source; A wavelength conversion member disposed adjacent to the light source; And a display panel on which light emitted from the wavelength converting member is incident, wherein the wavelength converting member comprises: a first host corresponding to the light source; A second host disposed next to the first host and having a thermal expansion coefficient different from that of the first host; And a plurality of wavelength conversion particles disposed in the first host and the second host.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical member and a display device including the optical member.

An embodiment relates to an optical member and a display device including the optical member.

Among display devices, there is a device that requires a backlight unit capable of generating light in order to display an image. The backlight unit is a device for supplying light to a display panel including a liquid crystal or the like and includes a light emitting device and means for effectively transmitting the light output from the light emitting device to the liquid crystal side.

As a light source of such a display device, an LED (Light Emitted Diode) or the like can be applied. Further, in order that the light output from the light source is effectively transmitted to the display panel side, a light guide plate and an optical sheet may be laminated and used.

At this time, an optical member that changes the wavelength of light generated from the light source and causes white light to enter the light guide plate or the display panel can be applied to such a display device. Particularly, in order to change the wavelength of light, a quantum dot or the like can be used.

The quantum dot has a particle size of 10 nm or less and has unique electrical and optical characteristics depending on its size. For example, when the approximate size is 55 to 65 Å, it can emit red, 40 to 50 Å to green, and 20 to 35 Å to blue. Yellow has medium size of red and green quantum dots. As the spectrum of light changes from red to blue, the size of the quantum dots varies from 65 Å to 20 Å, which may be slightly different.

In order to form the optical member including the quantum dots, the quantum dots emitting RGB or RYGB, which are three primary colors of light, can be formed by spin coating or printing on a transparent substrate such as glass. Here, when a quantum dot emitting yellow (Y) is further included, white light closer to natural light can be obtained. The matrix (medium) in which the quantum dots are dispersed can apply an inorganic substance or a polymer having excellent transmittance with respect to light in the visible light region and the ultraviolet region (including Far UV) or in the visible light region. For example, it may be inorganic silica, polymethylmethacrylate (PMMA), polydimethylsiloxane (PDMS), poly lactic acid (PLA), silicon polymer or YAG. In particular, such quantum dots and media can be denatured or damaged by heat.

A display device to which such a quantum dot is applied is disclosed in Korean Patent Laid-Open Publication No. 10-2011-0012246.

The embodiment aims to provide an optical member and a display device having improved durability and reliability, and having improved optical characteristics and color reproducibility.

A display device according to an embodiment includes a light source; A wavelength conversion member disposed adjacent to the light source; And a display panel on which light emitted from the wavelength converting member is incident, wherein the wavelength converting member comprises: a first host corresponding to the light source; A second host disposed next to the first host and having a thermal expansion coefficient different from that of the first host; And a plurality of wavelength conversion particles disposed in the first host and the second host.

An optical member according to an embodiment includes a receiving portion; A plurality of first hosts disposed in the receiving portion; A plurality of second hosts each disposed between the first hosts and having a thermal expansion rate different from that of the first hosts; And a plurality of wavelength conversion particles disposed in the first hosts and the second hosts.

The display device according to the embodiment uses a host having a different coefficient of thermal expansion for each region of the wavelength conversion member. Particularly, a host having a low thermal expansion coefficient is used in a region corresponding to the light source, and a host having high optical characteristics can be used even if the thermal expansion coefficient is high in a region not corresponding to the light source.

That is, even if the temperature of the region corresponding to the light source is increased by applying heat to the region where the light source is disposed, the expansion due to heat can be reduced as a whole.

Therefore, the display device according to the embodiment can minimize thermal deformation, and can have improved reliability and durability. Particularly, the display device according to the embodiment can suppress the occurrence of bubbles in the first host and the second host due to the heat of the light source. Accordingly, the display device according to the embodiment can prevent degradation of luminance and wavelength conversion efficiency due to heat, and can have improved optical characteristics and color reproducibility.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment.
FIG. 2 is a cross-sectional view showing a section cut along AA 'in FIG. 1; FIG.
3 is a perspective view showing the wavelength conversion member according to the embodiment.
Fig. 4 is a cross-sectional view showing a section cut along the line II 'in Fig. 3; Fig.
5 and 6 are views showing light emitting diodes, a wavelength converting member, and a light guide plate according to an embodiment.
7 is a view illustrating light emitting diodes, a wavelength conversion member, and a light guide plate 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 an exploded perspective view showing a liquid crystal display device according to an embodiment. 2 is a cross-sectional view showing a section taken along the line A-A in Fig. 3 is a perspective view showing the wavelength conversion member according to the embodiment. 4 is a cross-sectional view showing a section cut along the line I-I 'in FIG. 5 and 6 are views showing light emitting diodes, a wavelength converting member, and a light guide plate according to an embodiment.

1 to 6, a liquid crystal display according to an embodiment includes a mold frame 10, a backlight assembly 20, and a liquid crystal panel 30.

The mold frame 10 receives the backlight assembly 20 and the liquid crystal panel 30. The mold frame 10 has a rectangular frame shape. Examples of the material used for the mold frame 10 include plastic or reinforced plastic.

In addition, a chassis supporting the mold frame 10 and supporting the backlight assembly 20 may be disposed below the mold frame 10. The chassis may be disposed on a side surface of the mold frame 10.

The backlight assembly 20 is disposed inside the mold frame 10 and emits light toward the liquid crystal panel 30. The backlight assembly 20 includes a reflective sheet 100, a light guide plate 200, light emitting diodes 300, a wavelength conversion member 400, a plurality of optical sheets 500, and a flexible printed circuit board (FPCB) 600.

The reflective sheet 100 reflects light generated from the light emitting diodes 300 upward.

The light guide plate 200 is disposed on the reflective sheet 100 and receives light emitted from the light emitting diodes 300 and reflects the light upward through reflection, refraction and scattering.

The light guide plate 200 includes an incident surface facing the light emitting diodes 300. That is, the surface of the light guide plate 200 facing the light emitting diodes 300 is an incident surface.

The light emitting diodes 300 are disposed on the side surfaces of the light guide plate 200. More specifically, the light emitting diodes 300 are disposed on the incident surface.

The light emitting diodes 300 are light sources for generating light. In more detail, the light emitting diodes 300 emit light toward the wavelength converting member 400.

The light emitting diodes 300 generate the first light. For example, the first light may be blue light. That is, the light emitting diodes 300 may be blue light emitting diodes for generating blue light. The first light may be primarily blue light having a wavelength band between about 430 nm and about 470 nm.

The light emitting diodes 300 are mounted on the flexible printed circuit board 600. The light emitting diodes 300 are disposed under the flexible printed circuit board 600. The light emitting diodes 300 are driven by receiving a drive signal through the flexible printed circuit board 600.

The wavelength converting member 400 is interposed between the light emitting diodes 300 and the light guide plate 200. The wavelength converting member 400 is bonded to the side surface of the light guide plate 200. In more detail, the wavelength conversion member 400 is attached to the incident surface of the light guide plate 200. In addition, the wavelength conversion member 400 may be bonded to the light emitting diodes 300.

The wavelength converting member 400 receives the light emitted from the light emitting diodes 300 and converts the wavelength. For example, the wavelength conversion member 400 may convert the first light emitted from the light emitting diodes 300 into the second light and the third light.

Here, the second light may be red light, and the third light may be green light. That is, the wavelength converting member 400 may convert a portion of the first light to red light having a wavelength band between about 630 nm and about 660 nm, and may transmit a different portion of the first light to about 520 nm to about 560 nm Green light having a wavelength band between the wavelengths.

Accordingly, the first light passing through the wavelength conversion member 400 and the second light and the third light converted by the wavelength conversion member 400 may be mixed with each other to form white light. That is, the first light, the second light, and the third light may be mixed, and white light may be incident on the light guide plate 200.

2 to 6, the wavelength converting member 400 includes a tube 410, a sealing portion 420, wavelength converting particles 430, a plurality of first hosts 441, and a plurality of second Hosts 442.

The tube 410 receives the encapsulant 420, the wavelength converting particles 430, the first hosts 441, and the second hosts 442. That is, the tube 410 is a receiving portion that receives the sealing portion 420, the wavelength converting particles 430, the first hosts 441, and the second hosts 442. In addition, the tube 410 has a shape elongated in one direction.

The tube 410 may have a square pipe shape. That is, the cross section perpendicular to the longitudinal direction of the tube 410 may have a rectangular shape. Further, the width of the tube 410 may be about 0.6 mm, and the height of the tube 410 may be about 0.2 mm. That is, the tube 410 may be a capillary tube.

The tube 410 is transparent. Examples of the material used for the tube 410 include glass and the like. That is, the tube 410 may be a glass capillary tube.

The sealing portion 420 is disposed inside the tube 410. The sealing portion 420 is disposed at an end of the tube 410. The sealing part (420) seals the inside of the tube (410). The sealing portion 420 may include an epoxy resin.

The wavelength converting particles 430 are disposed inside the tube 410. More specifically, the wavelength conversion particles 430 are uniformly dispersed in the first hosts 441 and the second hosts 442, and the first hosts 441 and the second hosts 442 442 are disposed in the interior of the tube 410.

The wavelength converting particles 430 convert the wavelength of the light emitted from the light emitting diode 300. The wavelength converting particles 430 receive the light emitted from the light emitting diode 300 and convert the wavelength. For example, the wavelength conversion particles 430 may convert blue light emitted from the light emitting diode 300 into green light and red light. That is, some of the wavelength converting particles 430 convert the blue light into green light having a wavelength range of about 520 nm to about 560 nm, and another part of the wavelength converting particles 430 converts the blue light to about 630 And can be converted into red light having a wavelength band of from about nm to about 660 nm.

Alternatively, the wavelength converting particles 430 may convert ultraviolet rays emitted from the light emitting diode 300 into blue light, green light, and red light. That is, some of the wavelength converting particles 430 convert the ultraviolet light into blue light having a wavelength range of about 430 nm to about 470 nm, and another part of the wavelength converting particles 430 converts the ultraviolet light to about 520 Can be converted into green light having a wavelength band between nm and 560 nm. In addition, another part of the wavelength converting particles 430 may convert the ultraviolet ray into red light having a wavelength range of about 630 nm to about 660 nm.

That is, when the light emitting diode 300 is a blue light emitting diode generating blue light, the wavelength conversion particles 430 converting blue light into green light and red light, respectively, may be used. Alternatively, when the light emitting diode 300 is a UV light emitting diode that emits ultraviolet rays, the wavelength converting particles 430 that convert ultraviolet light into blue light, green light, and red light, respectively, may be used.

The wavelength conversion particles 430 may be a quantum dot (QD). The quantum dot may include core nanocrystals and shell nanocrystals surrounding the core nanocrystals. 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.

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 first hosts 441 are disposed within the tube 410. The first hosts 441 are spaced apart from one another. The tube 410 may have a shape extending in one direction. Accordingly, the first hosts 441 may be arranged in rows in the direction in which the tubes 410 extend.

The first hosts 441 correspond to the light emitting diodes 300, respectively. That is, the first hosts 441 are disposed on the emission surface of the light emitting diodes 300, respectively. That is, the first hosts 441 may be disposed to face the emitting surface of the light emitting diodes 300.

The first hosts 441 are transparent. The first hosts 441 may have a relatively low coefficient of thermal expansion. More specifically, the first hosts 441 have a lower linear expansion coefficient than the second hosts 442. For example, the first hosts 441 may have a coefficient of linear expansion of about 1 x ^10-4 / C to about 1.5 x ^10-4 / C. Examples of materials used for the first hosts 441 include polymers such as polyamide resins, phenol resins, and urea resins.

The second hosts 442 are disposed within the tube 410. The second hosts 442 are spaced apart from one another. The second hosts 442 may be arranged in rows in the direction in which the tubes 410 extend. The second hosts 442 are arranged next to the first hosts 441. More specifically, the second hosts 442 are disposed in an area between areas where the light emitting diodes 300 are disposed.

In addition, the second hosts 442 may be disposed between the first hosts 441, respectively. That is, the first hosts 441 and the second hosts 442 may be alternately arranged. More specifically, the first hosts 441 may be alternately arranged by the second hosts 442 one by one. That is, the first hosts 441 and the second hosts 442 may be arranged in a row in a direction in which the tubes 410 extend alternately with each other.

The second hosts 442 are transparent. The second hosts 442 may have a relatively high coefficient of thermal expansion. The second hosts 442 have a higher linear expansion coefficient than the first hosts 441. For example, the second hosts 442 may have a coefficient of linear expansion of about 4 x ^10-5 / C to about 7 x ^10-5 / C. Examples of materials used for the second hosts 442 include polymers such as silicone resins and epoxy resins.

The first hosts 441 and the second hosts 442 are in direct contact with each other. The first hosts 441 and the second hosts 442 may be integrally formed so that their boundaries are vague.

The first hosts 441 and the second hosts 442 surround the wavelength conversion particles 430. That is, the first hosts 441 and the second hosts 442 uniformly disperse the wavelength converting particles 430 therein.

The wavelength conversion particles 430 dispersed in the first hosts 441 and the first hosts 441 may constitute a plurality of first wavelength converters 401. Similarly, the wavelength conversion particles 430 dispersed in the second hosts 442 and the second hosts 442 may constitute a plurality of second wavelength converters 402. The first wavelength converting units 401 and the second wavelength converting units 402 are alternately arranged. In addition, the first wavelength conversion units 401 are disposed corresponding to the light emitting diodes 300, respectively.

An air layer 450 may be formed between the sealing portion 420 and the first host 441. The air layer 450 is filled with nitrogen. The air layer 450 functions as a buffer between the sealing part 420 and the first host 441.

The wavelength converting member 400 may be formed by the following method.

First, the wavelength conversion particles 430 are uniformly dispersed in the first resin composition. The first resin composition is transparent. The first resin composition may have photocurability. The first resin composition may include a polyamide resin, a phenol resin or a urea resin. The first resin composition may further include an additive such as a cross-linking agent.

In addition, the first resin composition may include an organic solvent. Examples of the organic solvent include N-methyl pyrrolidone (NMP) and dimethylacetamide (DMAC). At this time, a polyamide resin may be dissolved in the organic solvent. That is, the polyamide-based resin may be dissolved in the organic solvent to form the first resin composition.

Further, the wavelength converting particles 430 are uniformly dispersed in the second resin composition. The second resin composition is transparent. The second resin composition may have photocurability. The second resin composition may include an epoxy resin or a silicone resin. The second resin composition may further include an additive such as a cross-linking agent.

Thereafter, the inside of the tube 410 is depressurized, and the inlet of the tube 410 is locked to the first resin composition in which the wavelength converting particles 430 are dispersed, and the pressure of the surroundings is increased. Accordingly, the first resin composition in which the wavelength converting particles 430 are dispersed is introduced into the tube 410.

Thereafter, after the first resin composition has flowed to a certain degree, the inlet of the tube 410 is immersed in the second resin composition, and the pressure around the tube is increased. Accordingly, the second resin composition in which the wavelength bombardment particles 430 are dispersed is introduced into the tube 410.

This method is repeated so that the first resin composition and the second resin composition can be alternately filled into the tube 410.

Thereafter, a portion of the first resin composition or the second resin composition introduced into the tube 410 is removed, and the inlet portion of the tube 410 is emptied.

Thereafter, the first resin composition and the second resin composition introduced into the tube 410 are cured by ultraviolet rays or the like, and the first hosts 441 and the second hosts 442 are formed. The first resin composition and the second resin composition may be thermoset. In particular, when the first resin composition comprises a polyamide-based resin, the first resin composition and the second resin composition introduced into the tube 410 may be thermally cured.

Then, the epoxy resin composition flows into the inlet of the tube 410. Thereafter, the introduced epoxy resin composition is cured, and the sealing member 420 is formed. The process of forming the sealing member 420 proceeds in a nitrogen atmosphere and accordingly an air layer containing nitrogen may be formed between the sealing member 420 and the first hosts 441. [

The optical sheets 500 are disposed on the light guide plate 200. The optical sheets 500 improve the characteristics of light passing therethrough.

The flexible printed circuit board 600 is electrically connected to the light emitting diodes 300. The light emitting diodes 300 may be mounted. The flexible printed circuit board 600 is a flexible printed circuit board, and is disposed inside the mold frame 10. The flexible printed circuit board 600 is disposed on the light guide plate 200.

The mold frame 10 and the backlight assembly 20 constitute a backlight unit. That is, the backlight unit includes the mold frame 10 and the backlight assembly 20.

The liquid crystal panel 30 is disposed inside the mold frame 10 and disposed on the optical sheets 500.

The liquid crystal panel 30 displays an image by adjusting the intensity of light passing through the liquid crystal panel 30. That is, the liquid crystal panel 300 is a display panel for displaying an image. The liquid crystal panel 30 includes a TFT substrate, a color filter substrate, a liquid crystal layer interposed between the two substrates, and polarizing filters.

As described above, the wavelength conversion member 400 uses hosts having different thermal expansion ratios by region. Particularly, the first hosts 441 having a low coefficient of thermal expansion are used in a region corresponding to the light emitting diodes 300, and even if the thermal expansion coefficient is high in a region not corresponding to the light emitting diodes 300, The second hosts 442 having optical characteristics may be used.

That is, even if the temperature of the region corresponding to the light emitting diodes 300 is increased due to heat applied to the region where the light emitting diodes 300 are disposed, the first hosts 441 and the second hosts The overall thermal expansion of the heat sink 442 can be reduced.

Therefore, the liquid crystal display device according to the embodiment can minimize the deformation due to heat, and can have improved reliability and durability. Particularly, the liquid crystal display according to the embodiment can suppress the generation of bubbles in the first hosts 441 and the second hosts 442 due to the heat of the light emitting diodes 300. Accordingly, the liquid crystal display device according to the embodiment can prevent degradation of luminance and wavelength conversion efficiency due to heat, and can have improved optical characteristics and color reproducibility.

7 is a view illustrating light emitting diodes, a wavelength conversion member, and a light guide plate according to another embodiment. In the description of this embodiment, reference is made to the description of the embodiment described above. That is, the description of the preceding embodiments can be essentially combined with the description of this embodiment.

Referring to FIG. 7, the concentration of the wavelength conversion particles 430 in the first hosts 441 and the concentration of the wavelength conversion particles 430 in the second hosts 442 may be different. More specifically, the concentration of the wavelength conversion particles 430 in the first hosts 441 may be higher than the concentration of the wavelength conversion particles 430 in the second hosts 442 .

For example, the concentration of the wavelength converting particles 430 in the first host 441 may be about 1.5 wt% to about 5 wt%, and the concentration of the wavelength converting particles 430 in the second host Can be from about 0.5 wt% to about 3 wt%.

That is, the first wavelength converter 401 includes a larger number of wavelength conversion particles 430 than the second wavelength converter 402. At this time, since the first wavelength conversion units 401 correspond to the light emitting diodes 300, the liquid crystal display according to the present embodiment can effectively convert the wavelength of light. That is, the liquid crystal display according to the present embodiment can maximize the function of the wavelength conversion particles 430 by disposing more wavelength conversion particles 430 in a portion where the amount of light is large.

As described above, since more wavelength conversion particles 430 are disposed in the regions corresponding to the light emitting diodes 300, the liquid crystal display device according to the present embodiment has improved reliability and durability as well as improved color reproducibility Lt; / RTI >

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 (10)

Light source;
A wavelength conversion member disposed adjacent to the light source; And
And a display panel on which light emitted from the wavelength converting member is incident,
The wavelength conversion member
A first host corresponding to the light source;
A second host disposed next to the first host and having a thermal expansion coefficient different from that of the first host; And
And a plurality of wavelength conversion particles disposed in the first host and the second host,
The thermal expansion coefficient of the second host is larger than the thermal expansion coefficient of the first host,
Wherein the first host comprises a polyamide resin, a phenol resin or a urea resin, the second host comprises an epoxy resin,
Wherein the wavelength conversion particles comprise quantum dots. delete The method of claim 1, wherein the first host has a coefficient of linear expansion of 1 x ^10-4 / C to 1.5 x ^10-4 / C, and the second host has a coefficient of linear expansion of 4 x ^10-5 / ^-5 / C. The display device according to claim 1, wherein the first host and the second host are in direct contact with each other. The wavelength conversion device according to claim 1, wherein the wavelength conversion member includes an accommodating portion for accommodating the first host and the second host in an empty space inside,
Wherein the first host and the second host are alternately arranged in the accommodating portion. The display device according to claim 1, wherein the concentration of the wavelength conversion particles in the first host is larger than the concentration of the wavelength conversion particles in the second host. 7. The display device according to claim 6, wherein the concentration of the wavelength converting particles in the first host is 1.5 wt% to 5 wt%, and the concentration of the wavelength converting particles in the second host is 0.5 wt% to 3 wt%. Receiving portion;
A plurality of first hosts disposed in the receiving portion;
A plurality of second hosts each disposed between the first hosts and having a thermal expansion rate different from that of the first hosts; And
And a plurality of wavelength conversion particles disposed in the first hosts and the second hosts,
The thermal expansion coefficient of the second host is larger than the thermal expansion coefficient of the first host,
Wherein the first host comprises a polyamide resin, a phenol resin or a urea resin, and the second host comprises an epoxy resin. The container according to claim 8, wherein the receiving portion has a shape extending in one direction,
Wherein the first hosts and the second hosts are arranged alternately in columns in a direction in which the receptacles extend. The optical element according to claim 8, wherein the wavelength conversion particles comprise quantum dots.

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