KR101210173B1 - Display device - Google Patents

Abstract

A display device is disclosed. The display device includes a light guide plate; A light source disposed on a side of the light guide plate; A first wavelength conversion member disposed on the light guide plate; An optical sheet disposed on the first wavelength conversion member; And a second wavelength conversion member disposed on the optical sheet.

Description

Display device {DISPLAY DEVICE}

The embodiment relates to a display device.

Light emitting diodes (LEDs) are semiconductor devices that convert electricity into ultraviolet rays, visible rays, and infrared rays by using the characteristics of compound semiconductors. They are mainly used in home appliances, remote controllers, and large electric sign boards.

The high-intensity LED light source is used as an illumination light. It has high energy efficiency, long life and low replacement cost. It is resistant to vibration and shock, and it does not require the use of toxic substances such as mercury. It is replacing incandescent lamps and fluorescent lamps.

Also, the LED is very advantageous as a light source such as a medium and large-sized LCD TV and a monitor. Compared to CCFL (Cold Cathode Fluorescent Lamp), which is mainly used in LCD (Liquid Crystal Display), it has excellent color purity, low power consumption, and easy miniaturization, Is in progress.

Embodiments provide a display device having improved luminance.

In one embodiment, a display device includes: a light guide plate; A light source disposed on a side of the light guide plate; A first wavelength conversion member disposed on the light guide plate; An optical sheet disposed on the first wavelength conversion member; And a second wavelength conversion member disposed on the optical sheet.

The display device according to the embodiment converts the wavelength of light emitted from the light source by using two wavelength conversion members. In particular, the white light may be realized by the red light and green light converted by the two wavelength conversion members and the blue light emitted from the light source.

In this case, the optical sheet may be disposed between the two wavelength converting members, and the two wavelength converting members may be spaced apart from each other. Accordingly, the amount of light incident on the first wavelength converting member and the amount of light incident on the second wavelength converting member can be appropriately adjusted.

Therefore, the display device according to the embodiment can easily obtain a desired color reproducibility.

In particular, the first wavelength conversion member may convert blue light emitted from the light source into green light, and the second wavelength conversion member may convert blue light emitted from the light source into red light.

In this case, the first wavelength conversion member is disposed closer to the light guide plate through which blue light is emitted as surface light. In addition, the blue light reflected by the optical member interposed between the first wavelength converting member and the second wavelength converting member may be incident on the first wavelength converting member again. Thus, the conversion efficiency of the green light can be increased.

Accordingly, the display device according to the embodiment can increase the ratio of green light and can have improved luminance.

In addition, blue light and green light having improved properties may be incident on the second wavelength conversion member. Therefore, the second wavelength conversion member can efficiently convert incident light into red light.

Therefore, the display device according to the embodiment can also maintain or increase the ratio of red light, and can have improved color reproducibility and luminance.

1 is an exploded perspective view illustrating a liquid crystal display according to an embodiment.
2 is a cross-sectional view showing a cross section of the first wavelength conversion member.
3 is a cross-sectional view showing a cross section of the second wavelength conversion member.
4 is a diagram illustrating a process of displaying an image by a liquid crystal display according to an exemplary embodiment.
5 is a diagram illustrating a liquid crystal display according to another exemplary embodiment.
6 is a diagram illustrating a liquid crystal display according to another exemplary 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 cross section of the first wavelength conversion member. 3 is a cross-sectional view showing a cross section of the second wavelength conversion member. 4 is a diagram illustrating a process of displaying an image by a liquid crystal display according to an exemplary embodiment.

1 to 4, the liquid crystal display according to the 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 may irradiate uniform light onto the bottom surface of the liquid crystal panel 20 using a surface light source.

The backlight unit 10 is disposed under the liquid crystal panel 20. The backlight unit 10 includes a bottom cover 100, a light guide plate 200, a reflective sheet 300, a plurality of light emitting diodes 400, a printed circuit board 401, a plurality of optical sheets 510, 520, 530, a first wavelength converting member 600, and a second wavelength converting member 700.

The bottom cover 100 has a shape in which an upper portion thereof is opened. The bottom cover 100 accommodates the light guide plate 200, the light emitting diodes 400, the printed circuit board 401, the reflective sheet 300, and the optical sheets 510, 520, and 530. .

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 incident from the light emitting diodes 400 upward through total reflection, refraction, and scattering.

The reflective sheet 300 is disposed below the light guide plate 200. In more detail, 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 the 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 a side surface of the light guide plate 200.

The light emitting diodes 400 may be blue light emitting diodes generating blue light or UV light emitting diodes 400 generating ultraviolet light. That is, the light emitting diodes 400 may generate blue light having a wavelength band between about 430 nm and about 470 nm or ultraviolet rays having a wavelength band between about 300 nm and 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 driving signal through the printed circuit board 401.

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

The optical sheets 510, 520, and 530 are disposed on the light guide plate 200. The optical sheets 510, 520, and 530 change or improve characteristics of light emitted from the upper surface of the light guide plate 200 to supply the light to the liquid crystal panel 20.

The optical sheets 510, 520, and 530 may be a diffusion sheet 510, a first prism sheet 520, and a second prism sheet 530. In this case, the optical sheets 510, 520, and 530 are not limited to the diffusion sheet 510, the first prism sheet 520, and the second prism sheet 530. That is, in addition to the diffusion sheet 510, the first prism sheet 520, and the second prism sheet 530, various optical sheets may be used in the liquid crystal display according to the embodiment.

The diffusion sheet 510 is disposed on the light guide plate 200. In more detail, the diffusion sheet 510 may be interposed between the light guide plate 200 and the first wavelength conversion member 600. The diffusion sheet 510 may emit upward by improving the uniformity of incident light.

The diffusion sheet 510 may include a plurality of beads for scattering incident light. In addition, the diffusion sheet 510 may include a scattering pattern for scattering incident light. The scattering pattern may be formed on an upper surface and / or a lower surface of the diffusion sheet 510.

The first prism sheet 520 is disposed on the first wavelength conversion member 600. The first prism sheet 520 may include a pyramid pattern on an upper surface thereof. The second prism sheet 530 is disposed on the first prism sheet 520. The second prism sheet 530 may include a pyramid pattern on an upper surface thereof. The first prism sheet 520 and the second prism sheet 530 increase the straightness of the light passing through.

The first wavelength conversion member 600 is disposed on the diffusion sheet 510. In more detail, the first wavelength conversion member 600 is disposed between the diffusion sheet 510 and the first prism sheet 520.

The first wavelength conversion member 600 converts the wavelength of the light emitted from the light emitting diode 400. In more detail, the first wavelength conversion member 600 may convert light emitted from the light emitting diode 400 into light having a first wavelength.

For example, the light emitting diodes 400 may generate blue light, and the first wavelength conversion member 600 may convert the blue light into green light. That is, when the light emitting diodes 400 are blue light emitting diodes, the first wavelength conversion member 600 may convert blue light emitted upward from the light guide plate 200 into green light. That is, the first wavelength conversion member 600 may convert a part of the blue light into green light having a wavelength band between about 520 nm and about 560 nm.

Referring to FIG. 2, the first wavelength conversion member 600 includes a first lower substrate 610, a first upper substrate 620, a first wavelength conversion layer 630, a first inorganic protective layer 640, and a first 2 includes an inorganic protective film 650.

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

Examples of the material used as the first lower substrate 610 may include a transparent polymer such as polyethylene terephthalate (PET).

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

Examples of the material used as the first upper substrate 620 may include a transparent polymer such as polyethylene terephthalate.

The first lower substrate 610 and the first upper substrate 620 sandwich the first wavelength conversion layer 630. The first lower substrate 610 and the first upper substrate 620 support the first wavelength conversion layer 630. The first lower substrate 610 and the first upper substrate 620 protect the first wavelength conversion layer 630 from external physical impact.

The first wavelength conversion layer 630 is interposed between the first lower substrate 610 and the first upper substrate 620. The first wavelength conversion layer 630 may be in close contact with the upper surface of the first lower substrate 610 and may be in close contact with the lower surface of the first upper substrate 620.

The first wavelength conversion layer 630 includes a plurality of first wavelength conversion particles 631 and a first host layer 632.

The first wavelength converting particles 631 are uniformly dispersed in the first host layer 632, and the first host layer 632 is the first lower substrate 610 and the first upper substrate 620. ) Is placed between.

The first wavelength converting particles 631 convert the wavelength of the light emitted from the light emitting diodes 400. The wavelength conversion particles 531 receive light emitted from the light emitting diodes 400 to convert wavelengths. For example, the first wavelength conversion particles 631 may convert blue light emitted from the light emitting diodes 400 into green light. That is, the first wavelength converting particles 631 may convert the blue light into green light having a wavelength band between about 520 nm and about 560 nm.

The first wavelength converting particles 631 may be a plurality of quantum dots (QDs). When the first wavelength converting particles 631 are quantum dots, the diameter of the first wavelength converting particles 631 may be about 1 nm to about 10 nm.

The quantum dot may include a core nanocrystal and a shell nanocrystal surrounding the core nanocrystal. In addition, the quantum dot may include an organic ligand bound to the shell nanocrystal. In addition, the quantum dot may include an organic coating layer surrounding the shell nanocrystals.

The shell nanocrystals may be formed of two or more layers. The shell nanocrystals are formed on the surface of the core nanocrystals. The quantum dot may convert the wavelength of the light incident on the core core crystal into a long wavelength through the shell nanocrystals forming the shell layer and increase the light efficiency.

The quantum dot may include at least one of a group II compound semiconductor, a group III compound semiconductor, a group V compound semiconductor, and a group VI compound semiconductor. More specifically, the core nanocrystals may include Cdse, InGaP, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe or HgS. In addition, the shell nanocrystals may include CuZnS, CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe or HgS.

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.

Alternatively, the first wavelength conversion particles 631 may include a phosphor. In more detail, the first wavelength conversion particles 631 may be a green phosphor. For example, examples of the green phosphor include manganese doped zinc silicon oxide phosphors (eg, Zn 2 SiO 4: Mn), europium doped strontium gallium sulfide phosphors (eg, SrGa 2 S 4: Eu) or europium doped. A barium silicon oxide chloride-based phosphor (eg, Ba 5 Si 2 O 7 Cl 4: Eu), and the like.

When the first wavelength conversion particles 631 include a phosphor, the diameter of the first wavelength conversion particles 631 may be about 1 μm to about 10 μm.

The first host layer 632 surrounds the first wavelength converting particles 631. That is, the first host layer 632 uniformly disperses the first wavelength converting particles 631 therein. The first host layer 632 may be made of a polymer. The first host layer 632 is transparent. That is, the first host layer 632 may be formed of a transparent polymer.

The first host layer 632 is disposed between the lower substrate 510 and the upper substrate 520. The first host layer 632 may be in close contact with an upper surface of the lower substrate 510 and a lower surface of the upper substrate 520.

The first inorganic passivation layer 640 may be disposed under the lower substrate 510. In more detail, the first inorganic protective layer 640 may be coated on the bottom surface of the lower substrate 510.

Examples of the material used as the first inorganic protective film 640 include silicon oxide and the like.

The second inorganic passivation layer 650 may be disposed on the upper substrate 520. In more detail, the second inorganic protective layer 650 may be coated on the upper surface of the upper substrate 520.

Examples of the material used as the second inorganic protective film 650 include silicon oxide and the like.

The second wavelength conversion member 700 is disposed on the second prism sheet 530. In addition, the second wavelength conversion member 700 is disposed on the first wavelength conversion member 600. The second wavelength conversion member 700 is spaced apart from the first wavelength conversion member 600. That is, between the first wavelength converting member 600 and the second wavelength converting member 700, optical sheets 510, 520, such as the first prism sheet 520, the second prism sheet 530, and the like. 530 is interposed.

The second wavelength conversion member 700 converts the wavelength of the light emitted from the light emitting diode 400. In more detail, the second wavelength conversion member 700 may convert light emitted from the light emitting diode 400 into light having a second wavelength.

For example, the light emitting diodes 400 may generate blue light, and the second wavelength conversion member 700 may convert the blue light into red light. That is, when the light emitting diodes 400 are blue light emitting diodes, the second wavelength conversion member 700 may convert blue light emitted upward from the light guide plate 200 into red light. That is, the second wavelength conversion member 700 may convert a part of the blue light into red light having a wavelength band between about 640 nm and about 690 nm.

Referring to FIG. 3, the second wavelength conversion member 700 includes a second lower substrate 710, a second upper substrate 720, a second wavelength conversion layer 730, a third inorganic passivation layer 740, and a third inorganic passivation layer 740. 4 includes an inorganic protective film 750.

The second lower substrate 710 is disposed under the second wavelength conversion layer 730. The second lower substrate 710 may be transparent and flexible. The second lower substrate 710 may be in close contact with the bottom surface of the second wavelength conversion layer 730.

Examples of the material used as the second lower substrate 710 may include a transparent polymer such as polyethylene terephthalate (PET).

The second upper substrate 720 is disposed on the second wavelength conversion layer 730. The second upper substrate 720 may be transparent and flexible. The second upper substrate 720 may be in close contact with the top surface of the second wavelength conversion layer 730.

Examples of the material used as the second upper substrate 720 include a transparent polymer such as polyethylene terephthalate.

The second lower substrate 710 and the second upper substrate 720 sandwich the second wavelength conversion layer 730. The second lower substrate 710 and the second upper substrate 720 support the second wavelength conversion layer 730. The second lower substrate 710 and the second upper substrate 720 protect the second wavelength conversion layer 730 from external physical impact.

The second wavelength conversion layer 730 is interposed between the second lower substrate 710 and the second upper substrate 720. The second wavelength conversion layer 730 may be in close contact with the upper surface of the second lower substrate 710 and may be in close contact with the lower surface of the second upper substrate 720.

The second wavelength conversion layer 730 includes a plurality of second wavelength conversion particles 731 and a second host layer 732.

The second wavelength converting particles 731 are uniformly dispersed in the second host layer 732, and the second host layer 732 is the second lower substrate 710 and the second upper substrate 720. ) Is placed between.

The second wavelength converting particles 731 convert the wavelength of the light emitted from the light emitting diodes 400. The wavelength conversion particles 531 receive light emitted from the light emitting diodes 400 to convert wavelengths. For example, the second wavelength conversion particles 731 may convert blue light emitted from the light emitting diodes 400 into green light. That is, the second wavelength conversion particles 731 may convert the blue light into green light having a wavelength band between about 520 nm and about 560 nm.

The second wavelength converting particles 731 may be a plurality of quantum dots (QDs). When the second wavelength converting particles 731 are quantum dots, the diameters of the second wavelength converting particles 731 may be about 1 nm to about 10 nm. When both of the second wavelength converting particles 731 and the first wavelength converting particles 631 are quantum dots, the diameter of the second wavelength converting particles 731 is the first wavelength converting particles 631. It may be larger than the diameter of.

Alternatively, the second wavelength conversion particles 731 may include a phosphor. In more detail, the second wavelength conversion particles 731 may be a red phosphor. For example, examples of the red phosphor include praseodymium or aluminum-doped strontium titanium oxide-based phosphors (eg, SrTiO 3: Pr, Al) or praseodymium-doped calcium titanium oxide-based phosphors (eg, CaTiO 3: Pr) Etc. can be mentioned.

When the second wavelength converting particles 731 include a phosphor, the diameter of the second wavelength converting particles 731 may be about 1 μm to about 10 μm.

The second host layer 732 surrounds the second wavelength converting particles 731. That is, the second host layer 732 uniformly disperses the second wavelength conversion particles 731 therein. The second host layer 732 may be made of a polymer. The second host layer 732 is transparent. That is, the second host layer 732 may be formed of a transparent polymer.

The second host layer 732 is disposed between the lower substrate 510 and the upper substrate 520. The second host layer 732 may be in close contact with an upper surface of the lower substrate 510 and a lower surface of the upper substrate 520.

The third inorganic passivation layer 740 may be disposed under the lower substrate 510. In more detail, the third inorganic protective layer 740 may be coated on the lower surface of the lower substrate 510.

Examples of the material used as the third inorganic protective film 740 include silicon oxide and the like.

The fourth inorganic passivation layer 750 may be disposed on the upper substrate 520. In detail, the fourth inorganic passivation layer 750 may be coated on the upper surface of the upper substrate 520.

Examples of the material used as the fourth inorganic protective film 750 include silicon oxide and the like.

The liquid crystal panel 20 is disposed on the optical sheets 510, 520, and 530. In addition, the liquid crystal panel 20 is disposed on the panel guide. The liquid crystal panel 20 may be guided by the panel guide.

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 that displays an image by 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 polarization filters.

Although not shown in the drawings, the TFT substrate 21 and the color filter substrate 22 will be described in detail. In the TFT substrate 21, a plurality of gate lines and data lines intersect to define pixels, and respective intersection regions are provided. Each thin film transistor (TFT) is provided and is connected in a one-to-one correspondence with the pixel electrode mounted in each pixel. The color filter substrate 22 includes a color filter of R, G, and B colors corresponding to each pixel, a black matrix bordering each of them, covering a gate line, a data line, a thin film transistor, and the like, and a common electrode covering all of them. Include.

At the edge of the liquid crystal panel 20, a driving PCB 25 is provided to supply driving signals to the gate line and the data line.

The driving 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 tape carrier package (TCP).

As described above, the first wavelength conversion member 600 and the second wavelength conversion member 700 may be spaced apart from each other by the first prism sheet 520 and the second prism sheet 530. . Accordingly, the amount of light incident on the first wavelength conversion member 600 and the amount of light incident on the second wavelength conversion member 700 may be appropriately adjusted.

Therefore, the liquid crystal display device according to the embodiment can easily obtain a desired color reproducibility.

In particular, the first wavelength conversion member 600 converts blue light emitted from the light emitting diodes 400 into green light, and the second wavelength conversion member 700 is blue emitted from the light emitting diodes 400. The light can be converted to red light.

In this case, the first wavelength conversion member 600 is disposed closer to the light emitting diodes 400 based on a path of light emitted from the light emitting diodes 400. In addition, the blue light reflected by the first prism sheet 520 and the second prism sheet 530 interposed between the first wavelength conversion member 600 and the second wavelength conversion member 700 may be The light may be incident on the first wavelength conversion member 600 again. Therefore, the conversion efficiency of the green light in the liquid crystal display according to the embodiment may be increased.

Therefore, the liquid crystal display according to the embodiment can increase the ratio of green light and can have improved luminance.

In addition, blue light and green light having improved characteristics may be incident on the second wavelength conversion member 700 by the first prism sheet 520 and the second prism sheet 530. Therefore, the second wavelength conversion member 700 can efficiently convert incident light into red light.

Therefore, the liquid crystal display according to the embodiment can also maintain or increase the ratio of red light, and can have improved color reproducibility and luminance.

The first wavelength converting particles 631 may be quantum dots, and the second wavelength converting particles 731 may be phosphors. Alternatively, the first wavelength converting particles 631 may be phosphors, and the second wavelength converting particles 731 may be quantum dots.

In this case, the liquid crystal display according to the present exemplary embodiment separates the first wavelength converting particles 631 and the second wavelength converting particles 731, and respectively, the first wavelength converting member 600 and the second. It is included in the wavelength conversion member 700. Accordingly, the liquid crystal display according to the embodiment can prevent the quantum dot and the phosphor from aggregation with each other. That is, the liquid crystal display according to the exemplary embodiment may prevent the first wavelength converting particle 631 and the second wavelength converting particle 731 from aggregation with each other and have an improved wavelength conversion efficiency.

Therefore, the liquid crystal display according to the embodiment may have improved luminance and color reproducibility.

5 is a diagram illustrating a liquid crystal display according to another exemplary embodiment. 6 is a diagram illustrating a liquid crystal display according to another exemplary embodiment. In the present embodiments, reference is made to the foregoing embodiment. That is, the foregoing description of the liquid crystal display may be essentially combined with the description of the liquid crystal display of the present embodiment.

Referring to FIG. 5, the first wavelength conversion member 600 is disposed on the light guide plate 200. The first wavelength conversion member 600 may directly face the light guide plate 200. In addition, the diffusion sheet 510, the first prism sheet 520, and the second prism sheet 530 are sequentially disposed on the first wavelength conversion member 600.

In addition, the second wavelength conversion member 700 is disposed on the second prism sheet 530. As a result, the diffusion sheet 510, the first prism sheet 520, and the second prism sheet 530 are interposed between the first wavelength conversion member 600 and the second wavelength conversion member 700. .

The first wavelength conversion member 600 directly faces the light guide plate 200, and the diffusion sheet 510 is also disposed between the first wavelength conversion member 600 and the second wavelength conversion member 700. . Accordingly, the ratio of the green light converted by the first wavelength conversion member 600 may be further increased.

Referring to FIG. 6, the first wavelength conversion member 600 is disposed on the light guide plate 200. The first wavelength conversion member 600 may directly face the light guide plate 200. In addition, the diffusion sheet 510 is disposed on the first wavelength conversion member 600, and the second wavelength conversion member 700 is disposed on the diffusion sheet 510. In addition, the first prism sheet 520 and the second prism sheet 530 are sequentially disposed on the second wavelength conversion member 700.

Since only the diffusion sheet 510 is disposed between the first wavelength conversion member 600 and the second wavelength conversion member 700, the ratio of the red light converted by the second wavelength conversion member 700 further increases. Can be.

As such, by the arrangement of the optical sheets 510, 520, 530, the first wavelength converting member 600, and the second wavelength converting member 700, the ratio of the green light and the red light is easily and easily. Can be adjusted.

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 each embodiment may be combined or modified with respect to other embodiments by those 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 (12)

Light guide plate;
A light source disposed on a side of the light guide plate;
A first wavelength conversion member disposed on the light guide plate;
A first optical sheet disposed on the first wavelength converting member; And
And a second wavelength conversion member disposed on the first optical sheet and physically spaced apart from the first wavelength conversion member. The method of claim 1, wherein the first wavelength conversion member converts the light emitted from the light source to the light of the first wavelength,
And the second wavelength conversion member converts light emitted from the light source into light having a second wavelength longer than the first wavelength. The method of claim 1, wherein blue light is emitted from the light source,
The first wavelength conversion member converts incident blue light into green light,
And the second wavelength conversion member converts incident blue light into red light. The method of claim 1, wherein the first wavelength conversion member comprises a quantum dot,
The second wavelength conversion member includes a phosphor. The method of claim 1, wherein the first wavelength conversion member comprises a phosphor,
The second wavelength conversion member includes a quantum dot. The display device of claim 1, further comprising a second optical sheet disposed between the first optical sheet and the second wavelength conversion member. The display device of claim 6, further comprising a third optical sheet disposed between the second optical sheet and the second wavelength conversion member. The display device of claim 7, wherein the first optical sheet is a diffusion sheet, the second optical sheet is a first prism sheet, and the third optical sheet is a second prism sheet. The display device of claim 1, further comprising a second optical sheet interposed between the light guide plate and the first wavelength conversion member. The display device of claim 6, wherein the second optical sheet is a diffusion sheet, and the first optical sheet is a prism sheet. delete delete

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