KR101870446B1 - Optical member and display device having the same - Google Patents

Abstract

An optical member and a display device including the same are disclosed. Wherein the optical member comprises a light conversion layer comprising a plurality of light conversion particles; And a reflective transmissive portion disposed below the light conversion layer, wherein the reflective transmissive portion includes a reflective transmissive pattern that protrudes toward the light conversion layer.

Description

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

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

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

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

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

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

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

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 and a display device having improved luminance and luminance uniformity.

An optical member according to an embodiment includes a light conversion layer including a plurality of light conversion particles; And a reflective transmissive portion disposed below the light conversion layer, wherein the reflective transmissive portion includes a reflective transmissive pattern that protrudes toward the light conversion layer.

A display device according to an embodiment includes a light source; A light conversion member on which light from the light source is incident; And a display panel on which light from the light conversion member is incident, wherein the light conversion member includes a light conversion layer for converting a wavelength of light from the light source; And a reflective transmissive portion disposed between the light conversion layer and the light source with reference to a path of light from the light source, wherein the reflective transmissive portion includes a reflective transmissive pattern protruding toward the reflective transmissive portion.

An optical member according to an embodiment includes a reflective transmissive portion. The reflective transmissive portion can increase the transmissivity of light incident on the light conversion layer using the reflective transmission pattern and reflect the light from the light conversion layer.

In particular, the light conversion layer may have a higher refractive index than the reflective transmissive portion, and the reflective transmissive pattern may include an inclined surface. Accordingly, on the inclined surface, incident light is transmitted to the light conversion layer, and light from the light conversion particles in the light conversion layer can be totally reflected on the inclined plane.

Therefore, the reflective transmissive portion can effectively introduce light into the light conversion layer, thereby improving the light conversion efficiency of the light conversion layer.

Therefore, the optical member and the display device according to the embodiment can have improved luminance and color reproducibility.

1 is an exploded perspective view showing a liquid crystal display device according to a first embodiment.
FIG. 2 is a perspective view showing the light converting member according to the first embodiment. FIG.
FIG. 3 is a cross-sectional view showing a section cut along AA 'in FIG. 2. FIG.
4 is a perspective view showing a reflective transmissive portion.
5 is a perspective view showing a reflection transmission pattern according to another embodiment.
6 to 9 are cross-sectional views illustrating a reflective transmissive portion according to another embodiment of the present invention.
10 is an exploded perspective view showing a liquid crystal display device according to a second embodiment.
11 is a perspective view showing the light conversion member according to the second embodiment.
Fig. 12 is a cross-sectional view showing a section cut along BB 'in Fig. 11. Fig.
FIG. 13 is a cross-sectional view illustrating one side of a light guide plate, a light emitting diode, and a light conversion member according to the second embodiment.
14 is an exploded perspective view showing a liquid crystal display device according to the third 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 a first embodiment. FIG. 2 is a perspective view showing the light converting member according to the first embodiment. FIG. 3 is a cross-sectional view showing a section taken along line A-A in Fig. 4 is a perspective view showing a reflective transmissive portion. 5 is a perspective view showing a reflection transmission pattern according to another embodiment. 6 to 9 are cross-sectional views illustrating a reflective transmissive portion according to another embodiment of the present invention.

1 to 6, 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 light guide plate 200, a reflective sheet 300, a light source such as a plurality of light emitting diodes 400, a printed circuit board 401, (500).

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

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

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

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

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

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

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

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

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

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

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

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

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

2 and 3, the light conversion member 501 includes a lower substrate 510, an upper substrate 520, a light conversion layer 530, and a reflective transmissive portion 540.

The lower substrate 510 is disposed under the light conversion layer 530. More specifically, the lower substrate 510 is disposed under the reflective transmissive portion 540. The lower substrate 510 is transparent and flexible. The lower substrate 510 may be in close contact with the lower surface of the transflective portion 540.

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 and the reflective transmissive portion 540. The lower substrate 510 and the upper substrate 520 support the light conversion layer 530 and the reflective transmissive portion 540. 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. More specifically, the light conversion layer 530 is interposed between the upper substrate 520 and the reflective transmissive portion 540. The light conversion layer 530 may be in close contact with the lower surface of the upper substrate 520.

The light conversion layer 530 converts the wavelength of incident light. That is, the light conversion layer 530 converts the wavelength of the light from the light emitting diode 400. The light conversion layer 530 is a light conversion unit that converts the wavelength of the incident light.

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

The matrix 531 surrounds the light conversion particles 532. That is, the matrix 531 uniformly disperses the light conversion particles 532 therein. The matrix 531 is transparent. That is, the matrix 531 may be formed of a transparent polymer. For example, a silicone resin, an epoxy resin, or the like may be used for the matrix 531.

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

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

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

The photoconversion particles 532 convert the wavelength of the light emitted from the light emitting diodes 400. The light conversion particles 532 receive light emitted from the light emitting diodes 400 and convert wavelengths. For example, the light conversion particles 532 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 532 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 532 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 532 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 532 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 532 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 532 may convert the ultraviolet light into red light having a wavelength range of about 630 nm to about 660 nm.

That is, when the light emitting diodes 400 are a blue light emitting diode generating blue light, the light converting particles 532 converting blue light into green light and 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 532 may be used to convert ultraviolet light into blue light, green light, and red light, respectively.

The photo-conversion particles 532 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 reflective transmissive portion 540 is disposed below the light conversion layer 530. The reflective transmissive portion 540 is disposed between the light conversion layer 530 and the lower substrate 510. The reflective transmissive portion 540 may be in direct contact with the light conversion layer 530.

The reflective transmissive portion 540 includes a reflective transmissive pattern 541 that protrudes toward the light conversion layer 530.

The reflective transmissive pattern 541 includes an inclined surface that is inclined with respect to the upper surface of the lower substrate 510. 3 and 4, the transreflective pattern 541 includes a first inclined surface 542 and a second inclined surface 543 which intersect with each other.

The angle [theta] between the first inclined surface 542 and the second inclined surface 543 may be about 15 [deg.] To about 120 [deg.]. The width W of the transreflective pattern 541 may be gradually reduced toward the upper side. That is, the width W between the first inclined surface 542 and the second inclined surface 543 may be gradually decreased toward the upper side. More specifically, the width W between the first inclined surface 542 and the second inclined surface 543 may gradually become smaller toward the upper surface side of the light conversion layer 530.

5, the reflection transmitting pattern 541 may have a pyramid shape or the like.

The light-converting layer 530 may be in close contact with the reflective transmissive pattern 541. Accordingly, a pattern opposite to the reflective transmissive pattern 541 may be formed under the light conversion layer 530. That is, the light conversion layer 530 may include a pattern formed in a region between the reflective transmissive patterns 541. That is, the light conversion layer 530 may include inclined surfaces corresponding to the first inclined surface 542 and the second inclined surface 543, respectively.

6, the transreflective portion 540 may further include scattering particles 546 disposed on the inclined surfaces 542 and 543. In addition, as shown in FIG. The scattering particles 546 may be transparent particles. As the scattering particles 546, a glass bead, titanium oxide, or the like may be used.

The diameter of the scattering particles 546 may be from about 20 nm to about 100 nm. The scattered particles 546 may be formed integrally with the inclined surfaces 542 and 543. The number of the scattering particles 546 may be about 20 to 50 per one reflection transmitting pattern 541.

7, the reflective transmissive pattern 547 may further include a flat plane 548. In addition, as shown in FIG. The plane 548 may be interposed between the first inclined plane 542 and the second inclined plane 543. The plane 548 may extend from the first sloped surface 542 to the second sloped surface 543. The plane 548 may be horizontal with respect to the upper surface of the lower substrate 510.

The width W of the reflection transmitting pattern 547 may be gradually reduced toward the upper side. That is, the width W between the first inclined surface 542 and the second inclined surface 543 may be gradually decreased toward the upper side.

At this time, the plane 548 is disposed at a portion where the width between the first inclined surface 542 and the second inclined surface 543 is the smallest. That is, the plane 548 connects the upper ends of the first inclined surface 542 and the second inclined surface 543 with each other.

Also, as shown in FIG. 8, the reflection transmitting pattern 549 may have a bead shape. That is, the reflective transmission pattern 549 may have a spherical shape. More specifically, the reflective transmissive pattern 549 may be a plurality of beads disposed on the lower substrate 510.

As shown in FIG. 9, a plurality of scattering particles 550 may be disposed within the transreflective pattern 541. The scattering particles 550 may comprise aluminum, silver, platinum or gold.

The refractive index of the transflective portion 540 may be different from the refractive index of the light conversion layer 530. More specifically, the refractive index of the reflective transmissive portion 540 may be different from the refractive index of the matrix 531. For example, the difference between the refractive index of the reflective transmissive portion 540 and the refractive index of the matrix 531 may be about 0.1 to about 0.2.

More specifically, the refractive index of the reflective transmissive portion 540 may be lower than the refractive index of the matrix 531. The refractive index of the matrix 531 may be about 1.4 to about 1.6, and the refractive index of the transmissive transmissive portion 540 may be about 1.3 to about 1.4.

Examples of the material used as the reflective and transmissive portion 540 include inorganic materials such as silicon oxide, silicon oxide nitride, silicon nitride, silicon oxide carbide, aluminum oxide, niobium oxide or titanium oxide, or organic materials such as parylene And the like.

The reflective transmissive pattern 541 includes the inclined surface and has a refractive index lower than that of the matrix 531. Accordingly, light from the photo-converted particles can be totally reflected on the inclined plane. Accordingly, the light from the light conversion layer 530 can be reflected upward by the reflective transmission pattern 541.

In addition, the light from the light guide plate 200 can easily transmit the reflection / transmission pattern 541. That is, the light conversion layer 530 is automatically formed with a pattern protruding downward between the reflective and transmissive patterns 541. Such a pattern may perform an antireflection function to improve the incidence efficiency into the light conversion layer 530.

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

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

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

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

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

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

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

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

As described above, the transmissive portion 540 may increase the transmissivity of light incident on the light conversion layer 530 using the reflective transmissive pattern 541, increase the transmittance of the light from the light conversion layer 530 Can be reflected.

In particular, the light conversion layer 530 may have a higher refractive index than the reflective transmissive portion 540, and the reflective transmissive pattern 541 may include the inclined surface. Accordingly, on the inclined surface, the incident light is transmitted to the light conversion layer 530, and the light from the light conversion particles in the light conversion layer 530 can be reflected from the inclined surface by total reflection upward.

Therefore, the reflective transmissive portion 540 can efficiently introduce light into the light conversion layer 530, thereby improving the light conversion efficiency of the light conversion layer 530.

Therefore, the optical member and the display device according to the embodiment can have improved luminance and color reproducibility.

10 is an exploded perspective view showing a liquid crystal display device according to a second embodiment. 11 is a perspective view showing the light conversion member according to the second embodiment. 12 is a cross-sectional view showing a cross section cut along the line B-B 'in FIG. FIG. 13 is a cross-sectional view illustrating one side of a light guide plate, a light emitting diode, and a light conversion member according to the second embodiment. In the description of this embodiment, the description of the foregoing embodiment will be made. That is, the description of the above-described liquid crystal display device can be essentially combined with the description of the present liquid crystal display device except for the changed portions.

Referring to FIGS. 10 to 13, the light conversion member 600 is interposed between the light emitting diodes 400 and the light guide plate 200.

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

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

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

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

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

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

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

The lower substrate 610 and the upper substrate 620 sandwich the light conversion layer 630. The reflective transmissive portion 640 is interposed between the light conversion layer 630 and the lower substrate 610.

In the liquid crystal display device according to the present embodiment, the light conversion layer 630 has a relatively small size. Therefore, in manufacturing the liquid crystal display device according to the present embodiment, a small amount of the light conversion particles 632 can be used.

Therefore, the liquid crystal display according to the present embodiment can be easily manufactured at a low cost, by reducing the use of the light conversion particles 632.

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

Referring to FIG. 14, the liquid crystal display according to the present embodiment includes a plurality of light converting members 700. The light conversion members 700 correspond to the light emitting diodes 400, respectively.

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

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

In addition, the light conversion members 700 include a lower substrate, an upper substrate, a light conversion layer, and a reflective transmissive portion.

The characteristics of the lower substrate, the upper substrate, the light conversion layer, and the adhesion portion may be substantially the same as those described in the embodiments described above.

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

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

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

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

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

Claims (12)

An upper substrate;
A light conversion layer disposed below the upper substrate;
A transreflective portion disposed below the light conversion layer; And
And a lower substrate disposed under the reflective transmissive portion,
Wherein the upper substrate and the lower substrate comprise PET,
The light conversion layer
matrix; And
A plurality of photo-conversion particles dispersed in the matrix,
Wherein the plurality of photo-conversion particles comprise quantum dots,
Wherein the reflective transmissive portion includes a reflective transmissive pattern that protrudes toward the light conversion layer,
Wherein the reflective transmission pattern includes a first inclined surface and a second inclined surface that are inclined with respect to the upper surface of the lower substrate,
The width between the first inclined surface and the second inclined surface gradually decreases toward the upper surface of the light conversion layer,
Wherein the light conversion layer is in direct contact with the reflective transmissive pattern,
A first inorganic protective film disposed on a lower surface of the lower substrate, and a second inorganic protective film disposed on an upper surface of the upper substrate,
And the refractive indexes of the photo-conversion layer and the reflective transmissive portion are different from each other. The optical member according to claim 1, wherein the first inclined surface and the second inclined surface intersect each other. The optical member according to claim 1, wherein a difference in refractive index between the light conversion layer and the transmissive transmissive portion is 0.1 to 0.2. The optical member according to claim 1, comprising a plurality of scattering particles disposed between the transreflective pattern and the upper substrate. 5. The transparent optical member according to claim 4, wherein the scattering particles are transparent optical members. The optical member according to claim 1, wherein the first inorganic protective film and the second inorganic protective film comprise silicon oxide. The optical member according to claim 1, comprising a plane extending from the first inclined surface to the second inclined surface so as to connect the narrowest portion of the first inclined surface and the second inclined surface. Light source;
A light conversion member on which light from the light source is incident; And
And a display panel on which light from the photo-conversion member is incident,
The light conversion member
An upper substrate;
A light conversion layer disposed below the upper substrate;
A transreflective portion disposed below the light conversion layer; And
And a lower substrate disposed under the reflective transmissive portion,
Wherein the upper substrate and the lower substrate comprise PET,
The light conversion layer
matrix; And
A plurality of photo-conversion particles dispersed in the matrix,
Wherein the plurality of photo-conversion particles comprise quantum dots,
Wherein the reflective transmissive portion includes a reflective transmissive pattern protruding toward the reflective transmissive portion,
Wherein the reflective transmission pattern includes a first inclined surface and a second inclined surface that are inclined with respect to the upper surface of the lower substrate,
The width between the first inclined surface and the second inclined surface gradually decreases toward the upper surface of the light conversion layer,
Wherein the light conversion layer is in direct contact with the reflective transmissive pattern,
A first inorganic protective film disposed on a lower surface of the lower substrate, and a second inorganic protective film disposed on an upper surface of the upper substrate,
Wherein the refractive indexes of the light conversion layer and the reflective transmissive portion are different from each other. The display device according to claim 8, further comprising a plane extending from the first inclined plane to the second inclined plane so as to connect the narrowest portion of the first inclined plane and the second inclined plane. The display device according to claim 8, wherein the first inclined surface and the second inclined surface intersect each other. 9. The display device according to claim 8, wherein the refractive index of the transmissive portion is smaller than the refractive index of the light conversion layer. The display device according to claim 8, wherein a difference between a refractive index of the transreflective portion and a refractive index of the light conversion layer is 0.1 to 0.2.

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