KR101858746B1 - Light transforming member, display device having the same and method of fabricating the same - Google Patents

Abstract

A light conversion member, a display device including the same, and a manufacturing method thereof are disclosed. The display device includes: a light source; A plurality of light conversion particles for converting a wavelength of light generated in the light source; A tube receiving the photo-conversion particles; A seal disposed at an end of the tube and sealing the inlet of the tube; And a display panel for displaying an image using the light converted by the light conversion particles, wherein the tube and the sealing portion include an inorganic material.

Description

TECHNICAL FIELD [0001] The present invention relates to a light conversion member, a display device including the same, and a method of manufacturing the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

Embodiments relate to a light conversion member, a display device including the same, and a manufacturing method thereof.

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 converts the wavelength of the 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.

Embodiments provide an optical member having improved durability and reliability, a display including the same, and a manufacturing method thereof.

A display device according to an embodiment includes: a light source; A plurality of light conversion particles for converting a wavelength of light generated in the light source; A tube receiving the photo-conversion particles; A seal disposed at an end of the tube and sealing the inlet of the tube; And a display panel for displaying an image using the light converted by the light conversion particles, wherein the tube and the sealing portion include an inorganic material.

A light conversion member according to an embodiment includes a plurality of wavelength conversion particles for converting a wavelength of incident light; A tube receiving the photo-conversion particles; And a seal disposed at an end of the tube and sealing an inlet of the tube, wherein the tube and the seal comprise an inorganic material.

A method of manufacturing a photo-conversion member according to an embodiment includes dispersing a plurality of photo-conversion particles in a transparent resin composition, introducing the resin composition in which the photo-conversion particles are dispersed into a tube, curing the resin composition introduced into the tube , Forming a matrix, and inserting one end of the tube into a crucible containing an inorganic material to form a seal at the end of the tube.

The light conversion member according to an embodiment includes an inorganic material and includes a seal formed of the same material as the tube. In particular, the seal may be formed integrally with the tube. Accordingly, the seal can effectively seal the inlet of the tube.

Therefore, the photo-converted particles in the tube are not damaged by moisture, oxygen or the like from the outside. Therefore, the light conversion member and the display device according to the embodiment can effectively protect the light conversion particles from external chemical impact.

Therefore, the light conversion member and the display device according to the embodiment can have improved reliability and chemical resistance.

Further, the sealing portion can be easily formed by the heating, cooling, and the like. That is, after the same material as the tube is received in the crucible, the crucible is heated to melt the material, the tube is inserted into the crucible, and then the tube is cooled. Therefore, the liquid crystal display device according to the embodiment can secure improved reliability by a simple process.

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.
FIG. 3 is a perspective view showing the light conversion member according to the embodiment. FIG.
FIG. 4 is a cross-sectional view showing a section cut along BB 'in FIG. 3 according to the embodiment.
FIG. 5 is a cross-sectional view showing a section cut along BB 'in FIG. 3 according to another embodiment.
6 to 10 are views showing a process of manufacturing the light conversion member according to the 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. FIG. 3 is a perspective view showing the light conversion member according to the embodiment. FIG. Fig. 4 is a cross-sectional view showing a section cut along the line B-B 'in Fig. 3; Fig. 5 is a cross-sectional view showing a section taken along line B-B 'in Fig. 3 according to another embodiment. 6 to 10 are views showing a process of manufacturing the light conversion member according to the embodiment.

1 to 4, a liquid crystal display device 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, a light emitting diode 300, a light conversion member 400, a plurality of optical sheets 500, and a flexible printed circuit board (FPCB) 600.

The reflective sheet 100 reflects light emitted from the light emitting diode 300 upward.

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

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

The light emitting diode 300 is disposed on a side surface of the light guide plate 200. More specifically, the light emitting diode 300 is disposed on the incident surface.

The light emitting diode 300 is a light source for generating light. More specifically, the light emitting diode 300 emits light toward the light conversion member 400.

The light emitting diode 300 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 diode 300 may generate blue light having a wavelength range of about 430 nm to about 470 nm or ultraviolet light having a wavelength range of about 300 nm to about 400 nm.

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

The light conversion member 400 is interposed between the light emitting diode 300 and the light guide plate 200. The light conversion member 400 is adhered to the side surface of the light guide plate 200. More specifically, the light conversion member 400 is attached to the incident surface of the light guide plate 200. Further, the light conversion member 400 may be adhered to the light emitting diode 300.

The light conversion member 400 receives the light emitted from the light emitting diode 300 and converts the wavelength. For example, the light conversion member 400 may convert blue light emitted from the light emitting diode 300 into green light and red light. That is, the light conversion member 400 converts part of the blue light into green light having a wavelength range 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.

The light conversion member 400 may convert ultraviolet light emitted from the light emitting diode 300 into blue light, green light, and red light. That is, the light conversion member 400 converts a part of the ultraviolet ray into blue light having a wavelength range of about 430 nm to about 470 nm, and converts the other part of the ultraviolet light to a light having a wavelength range of about 520 nm to about 560 nm Green light, and another part of the ultraviolet light into red light having a wavelength band between about 630 nm and about 660 nm.

Accordingly, the light passing through the light conversion member 400 and the light converted by the light conversion member 400 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.

3 to 5, the light conversion member 400 includes a tube 410, a sealant 420, a plurality of photo-conversion particles 430, and a matrix 440.

The tube 410 receives the light conversion particles 430 and the matrix 440. That is, the tube 410 is a container for accommodating the light conversion particles 430 and the matrix 440. In addition, the tube 410 has a shape elongated in one direction.

One end of the tube 410 is sealed. One end of the tube 410 is sealed by the sealing portion 420.

The tube 410 may have a square tube 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. The material used for the tube 410 may include an inorganic material. Preferably, the material used for the tube 410 may be a glass comprising borosilicate. That is, the tube 410 may be a glass capillary tube.

The sealing portion 420 is disposed at one end of the tube 410. That is, the sealing portion 420 may cover one end of the tube 410. The sealing portion 420 is formed of the same material as the tube 410. That is, the material used for the sealing part 410 may include an inorganic material. Preferably, the material used for the sealing part 410 may be glass containing borosilicate.

The sealing part 420 may be integrally formed with the tube 410. The sealing portion 420 may be integrally formed by softening or melting a part of the tube 410. Accordingly, the first sealing portion 421 may include a curved surface. That is, both the inner surface and the outer surface of the first sealing portion 421 may be curved.

The photo-conversion particles 430 are disposed inside the tube 410. More specifically, the light conversion particles 430 are uniformly dispersed in the matrix 440, and the matrix 440 is disposed inside the tube 410.

The photoconversion particles 430 convert the wavelength of the light emitted from the light emitting diode 300. The photoconversion particles 430 receive the light emitted from the light emitting diode 300 and convert the wavelength. For example, the light conversion particles 430 may convert blue light emitted from the light emitting diode 300 into green light and red light. In other words, some of the light conversion 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 light conversion 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 light conversion particles 430 may convert ultraviolet light emitted from the light emitting diode 300 into blue light, green light, and red light. That is, some of the photo-conversion 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 photo-conversion particles 430 converts the ultraviolet light to about 520 Can be converted into green light having a wavelength band between nm and 560 nm. Further, another part of the light conversion particles 430 may convert the ultraviolet ray into red light having a wavelength band 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 light converting 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 generates ultraviolet rays, the light conversion particles 430 may be used to convert ultraviolet light into blue light, green light, and red light, respectively.

The photoconversion particles 430 may be a plurality of quantum dots (QDs). 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 matrix 440 surrounds the photo-conversion particles 430. That is, the matrix 440 uniformly disperses the light conversion particles 430 therein. The matrix 440 may be comprised of a polymer. The matrix 440 is transparent. That is, the matrix 440 may be formed of a transparent polymer.

The matrix 440 is disposed within the tube 410. That is, the matrix 440 is entirely filled in the tube 410. The matrix 440 may be in close contact with the inner surface 410b of the tube 410. [

An air layer 450 is formed between the first sealing portion 421 and the matrix 440. The air layer 450 is filled with nitrogen. The air layer 450 performs a buffer function between the first sealing portion 421 and the matrix 440.

6 to 10, the light conversion member 400 may be formed by the following method.

Referring to FIG. 6, the photoconversion particles 430 are uniformly dispersed in the resin composition 440a. The resin composition 440a is transparent. The resin composition 440a may have photo-curability.

Thereafter, the inside of the tube 410 in which the scattering pattern is formed is depressurized, the inlet of the tube 410 is dipped in the resin composition 440a in which the photo-conversion particles 430 are dispersed, do. Accordingly, the resin composition 440a in which the photo-conversion particles 430 are dispersed is introduced into the tube 410.

Referring to FIG. 7, a portion of the resin composition 440a flowing into the tube 410 is removed, and the inlet portion of the tube 410 is emptied.

Thereafter, the resin composition 440a flowing into the tube 410 is cured by ultraviolet rays or the like, and the matrix 440 is formed.

Referring to FIG. 8, the tube 410 may be inserted into a crucible 700 including the same inorganic material 710 as the tube 410. Preferably, the crucible 700 may be provided with pieces or particles of borosilicate material.

The outer circumferential surface of the crucible 700 may be surrounded by the heating member 720. Preferably, the heating member 720 may be a resistive heating element that generates heat when power is applied thereto, and may be disposed at regular intervals. That is, the heating member 720 may have a wire shape in order to arrange the heating member 720 in a predetermined shape. In one example, the heating member 720 may include a filament, a coil, or a carbon wire or the like.

The crucible 700 can be heated to a temperature higher than the melting temperature of the inorganic material 710 contained in the crucible 700 by the heating member 720. In one example, the crucible 700 can be heated to a temperature of 500 ° C to 600 ° C, which is the melting temperature of the borosilicate material. Thereafter, one end of the tube, that is, the inlet portion of the tube is inserted into the crucible 700 containing the molten inorganic substance 710, inserted for a certain period of time, preferably 1 second to 10 seconds, And cooled.

9 and 10, a sealing portion 420 may be formed at one end of the tube 410. Referring to FIG. The sealing part 420 may include various shapes depending on the time for inserting the tube 410 into the crucible 700 and the cooling time. 10, a part of the tube 410 may be softened or melted to be integrally formed with the sealing part 420. As shown in FIG. That is, one end of the tube 410 and the molten inorganic material 710 may be softened and melted to be integrally formed according to the insertion time and the cooling time of the tube 410. That is, one end of the tube 410 and the molten inorganic material 710 may include the same material and may be integrally formed by the heating and cooling.

Referring again to FIGS. 1 and 2, 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 diode 300. The light emitting diode 300 can 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. In more detail, the liquid crystal panel displays an image using light whose wavelength has been converted by the light conversion member (400).

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 sealing portion 420 may include the tube 410 and an inorganic material, and is formed of the same material. In particular, the seal 420 may be integrally formed with the tube 410 to effectively seal the inlet of the tube 410.

Therefore, the photoconversion particles 430 are not damaged by external moisture, oxygen, or the like. Accordingly, the light conversion member 400 can effectively protect the light conversion particles from external chemical impact.

Therefore, the liquid crystal display device according to the embodiment can have improved reliability and chemical resistance.

In addition, the sealing portion 420 can be easily formed by the heating, cooling, and the like. That is, the same material as the tube 410 is accommodated in the crucible 700, the crucible 700 is heated to melt the material, the tube 410 is inserted into the crucible 700, The sealing portion 420 can be formed. Therefore, the liquid crystal display device according to the embodiment can secure improved reliability by a simple process.

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 (14)

A tube whose one end is opened and the other end facing the one end is closed;
A matrix disposed within the tube;
A plurality of wavelength conversion particles that convert the wavelength of incident light and are dispersed in the matrix;
A seal disposed at one end of the tube and sealing the inlet of the tube; And
And an air layer disposed between the sealing portion and the matrix,
The seal being disposed in contact with an outer surface of the tube,
Wherein the tube and the seal comprise an inorganic material,
Wherein the wavelength conversion particles comprise quantum dots. The method according to claim 1,
Wherein the inorganic material comprises glass. The method according to claim 1,
Wherein the tube and the sealing portion are integrally formed. The method according to claim 1,
Wherein the tube and the seal comprise the same material. A light guide plate;
A light source disposed on a side surface of the light guide plate;
A light conversion member disposed between the light guide plate and the light source; And
And a display panel disposed on the photo-conversion member,
Wherein the photo-
A tube whose one end is opened and the other end facing the one end is closed;
A matrix disposed within the tube;
A plurality of wavelength conversion particles that convert the wavelength of incident light and are dispersed in the matrix;
A seal disposed at one end of the tube and sealing the inlet of the tube; And
And an air layer disposed between the sealing portion and the matrix,
The seal being disposed in contact with an outer surface of the tube,
Wherein the tube and the seal comprise an inorganic material,
Wherein the wavelength conversion particles comprise quantum dots. 6. The method of claim 5,
Wherein the inorganic material comprises glass. 6. The method of claim 5,
Wherein the tube and the sealing portion are integrally formed. 6. The method of claim 5,
Wherein the tube and the seal comprise the same material. delete delete delete delete delete delete

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