KR101725012B1 - Display device - Google Patents

Abstract

A display device is started. The display device includes a light source; A light guide plate on which light from the light source is incident; A light conversion member disposed on the light guide plate; And a display panel disposed on the light conversion member, wherein the light guide plate includes a plurality of scattering portions having a diameter of 90 mu m to 300 mu m.

Description

Display device {DISPLAY DEVICE}

The embodiment relates to 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.

The embodiment intends to provide a display device having improved luminance.

A display device according to an embodiment includes a light source; A light guide plate on which light from the light source is incident; A light conversion member disposed on the light guide plate; And a display panel disposed on the light conversion member, wherein the light guide plate includes scattering portions having a diameter of 90 mu m to 300 mu m.

A display device according to an embodiment includes a light guide plate; A light source disposed on a side surface of the light guide plate; A light conversion sheet disposed on the light guide plate; And a display panel disposed on the light conversion sheet, wherein the light guide plate includes scattering portions having a diameter of 90 mu m to 300 mu m.

The display device according to the embodiment disposes the light conversion member on the light guide plate, and the scattering portions have a large diameter of 90 mu m to 300 mu m. At this time, the light conversion member includes a plurality of light conversion particles. The photoconversion particles can change the wavelength of the incident light and change the optical path at random. That is, the photoconversion particles can simultaneously perform the scattering function.

Therefore, even if the scattering portions have a large diameter, the light conversion member has a scattering function, so that luminance uniformity as a whole does not decrease.

As a result, since the scattering portions have a large diameter, the brightness can be increased as a whole

Therefore, the display device according to the embodiment can have improved luminance without reducing luminance uniformity.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment.
2 is a perspective view showing the light guide plate.
FIG. 3 is a cross-sectional view showing a section cut along AA 'in FIG. 2. FIG.
4 is a sectional view showing the light guide plate.
5 is a cross-sectional view illustrating a light guide plate according to another embodiment.
6 is a cross-sectional view illustrating a light guide plate according to another embodiment.
7 is a perspective view illustrating a light guide plate according to another embodiment.
FIG. 8 is a cross-sectional view showing a section cut along BB 'in FIG. 7; FIG.
9 is a perspective view showing the light conversion sheet according to the embodiment.
FIG. 10 is a sectional view taken along the line CC 'in FIG. 9. FIG.

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 perspective view showing the light guide plate. 3 is a cross-sectional view showing a section taken along line A-A in Fig. 4 is a sectional view showing the light guide plate. 5 is a cross-sectional view illustrating a light guide plate according to another embodiment. 6 is a cross-sectional view illustrating a light guide plate according to another embodiment. 7 is a perspective view illustrating a light guide plate according to another embodiment. FIG. 8 is a cross-sectional view showing a section cut along the line B-B 'in FIG. 7; FIG. 9 is a perspective view showing the light conversion sheet according to the embodiment. 10 is a sectional view taken along the line C-C 'in FIG.

1 to 10, a liquid crystal display 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 reflective sheet 300, a light source such as a plurality of light emitting diodes 400, a printed circuit board 401, a light guide plate 200, (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 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 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 light guide plate 200 is disposed below the liquid crystal panel 20. The light guide plate 200 is disposed on the reflective sheet 300. The light guide plate 200 has a plate shape. The light guide plate 200 is transparent. Examples of the material used as the light guide plate 200 include acrylic resins formed by methyl acrylate, ethyl acrylate, cyclohexyl acrylate, phenyl acrylate, or benzyl acrylate. For example, as the guide part 210, a polymer such as polymethylmethacrylate (PMMA) or polycarbonate (PC) may be used. Further, glass may be used as the light guide plate 200. More specifically, the glass used as the light guide plate 200 may include silicon oxide, titanium oxide, aluminum hydroxide, magnesium oxide, zinc oxide, or the like. The thickness of the light guide plate 200 may be about 0.5 mm to about 1.5 mm.

As shown in FIGS. 2 to 4, a plurality of scattering parts 210 are formed on the light guide plate 200. That is, the scattering parts 210 are formed on at least one surface of the light guide plate 200. The path of the incident light of the scattering units 210 can be changed. That is, the scattering units 210 are optical path changing units that change paths of incident light. More specifically, the scattering portions 210 may scatter incident light. More specifically, the scattering portions 210 may scatter incident light upward. In addition, the scattering parts 210 constitute scattering patterns on the upper surface of the light guide plate 200.

The scattering parts 210 may be disposed on the upper surface of the light guide plate 200. The scattering portions 210 may be protrusions formed on the upper surface of the light guide plate 200. The scattering portions 210 may have a dot shape when viewed from the top side.

The diameter R1 of the scattering portions 210 may be about 90 탆 or more. The diameter R1 of the scattering portions 210 may be about 90 占 퐉 to about 300 占 퐉. More specifically, the diameter R1 of the scattering portions 210 may be about 100 탆 to about 300 탆. More specifically, the diameter R1 of the scattering portions 210 may be about 150 占 퐉 to about 250 占 퐉.

The scattering portions 210 are spaced apart from each other. At this time, the pitch P between the scattering portions 210 may be gradually decreased from the light emitting diodes 400. That is, the scattering parts 210 may be gradually and densely arranged as the distance from the light emitting diodes 400 increases. Accordingly, the light guide plate 200 can uniformly emit light upward as a whole.

The scattering part 210 includes a scattering protrusion 211 and a scattering groove 212.

The scattering protrusion 211 may include a curved surface. The protruding portion of the scattering protrusion 211 may be formed as a curved surface as a whole. More specifically, the scattering protrusion 211 may have a hemispherical shape. The diameter R2 of the scattering protrusion 211 may be about 80 占 퐉 to about 290 占 퐉. In addition, the height of the scattering protrusion 211 may be about 40 탆 to about 150 탆.

The scattering grooves 212 may be formed on the upper surface of the light guide plate 200. The scattering groove 212 may be adjacent to the scattering protrusion 211. More specifically, the scattering groove 212 may surround the scattering protrusion 211. That is, the scattering grooves 212 can extend along the periphery of the scattering protrusions 211. The scattering groove 212 may have a closed loop shape when viewed from the top side.

The width of the grooves 220 may be between about 5 microns and about 10 microns. The depth of the grooves 220 may be from about 2 [mu] m to about 6 [mu] m.

As shown in FIG. 5, the scattering parts 210 may be formed on the lower surface of the light guide plate 200. That is, the scattering parts 210 may directly face the reflective sheet 300.

As shown in FIG. 6, the scattering parts 210 may be formed on the upper and lower surfaces of the light guide plate 200.

7 and 8, the light guide plate 200 may have a plurality of print scattering units 220 formed thereon. The print scattering units 220 may be printed on the upper surface and / or the lower surface of the light guide plate 200.

The print scattering parts 220 may be formed directly on the upper surface and / or the lower surface of the light guide plate 200. The print scattering parts 220 may be a pattern protruding from at least one side of the light guide plate 200, for example, the upper surface and / or the lower surface of the light guide plate 200. The diameter R3 of the print scattering units 220 may be about 90 占 퐉 to about 300 占 퐉. The diameter R3 of the print scattering units 220 may be about 100 [mu] m to about 300 [mu] m. More specifically, the diameter R3 of the print scattering portions 220 may be about 150 占 퐉 to about 250 占 퐉.

The print scattering units 220 include a plurality of beads 221 and a printing unit 222. The beads 221 may be transparent. The beads 221 may have a high refractive index. The refractive index of the beads 221 may be about 1.6 to 2.2. The beads 221 may include aluminum oxide or titanium oxide.

The diameter of the beads 221 may be about 50 nm to about 10 mu m. More specifically, the diameters of the beads 221 may be from about 5 [mu] m to about 10 [mu] m.

The printing unit 222 includes a transparent resin. The printing unit 222 receives the beads 221. The beads 221 may be inserted into the printing unit 222. The printing unit 222 may adhere the beads 221 to the upper surface or the lower surface of the light guide plate 200. The printing unit 222 may have a relatively low refractive index. The refractive index of the printing unit 222 may be 1.2 to 1.4.

The area of each print scattering unit 220 may gradually increase as the distance from the light emitting diode 400 increases. That is, the diameter of the print scattering unit 220 may become larger as the distance from the light emitting diode 400 increases. Accordingly, it can be compensated that the light intensity decreases as the distance from the light emitting diodes 400 increases.

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 sheet 501, a diffusion sheet 502, a first prism sheet 503, and a second prism sheet 504.

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

For example, when the light emitting diodes 400 are a blue light emitting diode, the light converting sheet 501 may convert blue light emitted upward from the light guide plate 200 into green light and red light. That is, the light conversion sheet 501 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 band of about 630 nm to about 660 nm It can be converted into red light.

When the light emitting diodes 400 are UV light emitting diodes, the light conversion sheet 501 may convert ultraviolet light emitted from the upper surface of the light guide plate 200 into blue light, green light, and red light. That is, the light conversion sheet 501 converts 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, light passing through the light conversion sheet 501 without being converted and light converted by the light conversion sheet 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.

9 and 10, the light conversion sheet 501 includes a lower substrate 510, an upper substrate 520, a light conversion layer 530, a lower antireflection film 540, and an upper antireflection film 550 ).

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.

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 photo-conversion layer 530 includes a plurality of photo-conversion particles 531 and a host layer 532.

The photo-conversion particles 531 are disposed between the lower substrate 510 and the upper substrate 520. More specifically, the photo-conversion particles 531 are uniformly dispersed in the host layer 532 and the host layer 532 is disposed between the lower substrate 510 and the upper substrate 520.

The photoconversion particles 531 convert the wavelength of the light emitted from the light emitting diodes 400. The light conversion particles 531 receive the light emitted from the light emitting diodes 400 and convert the wavelength. For example, the light conversion particles 531 may convert blue light emitted from the light emitting diodes 400 into green light and red light. That is, some of the light conversion particles 531 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 531 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 531 may convert ultraviolet light emitted from the light emitting diodes 400 into blue light, green light, and red light. That is, some of the light conversion particles 531 convert the ultraviolet light into blue light having a wavelength range of about 430 nm to about 470 nm, and another part of the light conversion particles 531 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 photo-converted particles 531 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 diodes 400 are the blue light emitting diodes 400 generating blue light, the light converting particles 531 converting the blue light into the green light and the red light, respectively, may be used. Alternatively, when the light emitting diodes 400 are UV light emitting diodes that generate ultraviolet rays, the light conversion particles 531 that convert ultraviolet light into blue light, green light, and red light, respectively, may be used.

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

The host layer 532 is disposed between the lower substrate 510 and the upper substrate 520. The host layer 532 may be in close contact with the upper surface of the lower substrate 510 and the lower surface of the upper substrate 520.

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.

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 matrix for covering the gate lines, the data lines, the thin film transistors, etc., .

And a driving PCB 25 for supplying a driving signal to the gate line and the data line is provided at an edge of the liquid crystal display panel 210.

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 liquid crystal display device according to the embodiment, the light conversion member is disposed on the light guide plate 200, and the scattering portions 210 have a large diameter of about 90 μm to about 300 μm. At this time, the light conversion member includes the light conversion particles. The photoconversion particles can change the wavelength of the incident light and change the optical path at random. That is, the photoconversion particles can simultaneously perform the scattering function.

Therefore, even though the scattering portions 210 have a large diameter, the light conversion member has a scattering function, so that the luminance uniformity is not reduced as a whole.

As a result, since the scattering portions 210 have a large diameter, the brightness can be increased as a whole

Therefore, the liquid crystal display according to the embodiment can have an improved luminance without reducing luminance uniformity.

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 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.

Experimental Example

A light conversion sheet including CdSe / ZnS quantum dots having a diameter of about 2 nm is disposed on the upper surface of a light guide plate having scattering portions having a diameter of about 150 mu m, and light is emitted using a blue light emitting diode on the side of the light guide plate Respectively.

Comparative Example

The rest was the same as the experimental example, except that scattering portions having a diameter of about 25 mu m were formed in the light guide plate.

result

Compared with the comparative example, in the case of the experimental example, the luminance uniformity was almost the same, but the luminance of the experimental example was improved by about 2%.

Claims (11)

Light source;
A plate-shaped light guide plate having side surfaces and an upper surface to which light emitted from the light source is incident;
A scattering unit for scattering light emitted from an upper surface of the light guide plate;
A light converting member disposed on the light guide plate and the scattering member;
At least two optical sheets disposed on the light conversion member; And
And a display panel on the optical sheet,
Wherein the optical sheet includes two prism sheets,
Wherein the display panel is disposed on the prism sheet,
Wherein the scattering portion is disposed between the light guide plate and the light conversion member,
Wherein the scattering portion is disposed on an upper surface of the light guide plate,
Wherein the scattering portion includes a plurality of beads,
The diameter of the beads is 50 nm to 10 mu m,
Wherein the photo-
A lower substrate;
A light conversion layer on the lower substrate; And
And an upper substrate on the light conversion layer,
Wherein the photo-conversion layer comprises a plurality of photo-conversion particles and a host layer,
Wherein the photoconversion particle comprises a quantum dot,
The bead is disposed between the lower substrate and the upper surface of the light guide plate,
Wherein the upper substrate and the lower substrate comprise the same material,
Wherein the upper substrate and the lower substrate comprise polyethylene terephthalate (PET)
Wherein the light conversion layer is disposed between the lower substrate and the upper substrate. The method according to claim 1,
The scattering unit includes at least one printing unit; And a bead disposed within the at least one printing unit. 3. The method of claim 2,
Wherein the printing unit has a diameter of 90 mu m to 300 mu m. The method according to claim 1,
Wherein the scattering portion comprises a pattern,
Wherein the pattern includes a plurality of printing units and beads dispersed in the printing unit,
Wherein the printing unit includes a transparent resin. 3. The method of claim 2,
And the refractive index of the bead is larger than the refractive index of the printing unit. 6. The method of claim 5,
And the refractive index of the bead is 1.6 to 2.2. 6. The method of claim 5,
And the refractive index of the printing unit is 1.2 to 1.4. delete The method according to claim 1,
Wherein the bead is transparent. 3. The method of claim 2,
Wherein the refractive index of the bead is different from the refractive index of the printing unit. The method according to claim 1,
And the light emitted from the light source is emitted to the upper surface from the side surface of the light guide plate.

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