KR101855997B1 - Display device - Google Patents

Abstract

A display device is started. The display device 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, the light conversion member comprising: a plurality of light conversion regions for converting wavelengths of light from the light source; And a plurality of transmissive regions disposed between the light conversion regions, respectively.

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 color reproducibility, luminance, and luminance uniformity.

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, the light conversion member comprising: a plurality of light conversion regions for converting wavelengths of light from the light source; And a plurality of transmissive regions disposed between the light conversion regions, respectively.

The display device according to the embodiment includes the light conversion regions and the transmissive regions. Accordingly, the display device according to the embodiment can display an image using light having a desired color coordinate by using the photo-conversion member.

That is, the areas of the light conversion regions and the transmission regions are appropriately adjusted, and the light conversion member can emit light having an optimal color coordinate.

In particular, the transmissive regions may have a slit structure. That is, the transmission regions have a shape extending in one direction and may have a small width. Accordingly, light from the light source can be widely diffused by diffraction when passing through the transmissive region.

In particular, the light source generates blue light, and the light conversion regions convert the blue light into green light and red light. At this time, since the blue light passing through the transmissive regions spreads widely, the display device according to the embodiment can have a uniform color reproducibility as a whole.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment.
FIG. 2 is a perspective view showing the light conversion member according to the embodiment. FIG.
3 is a perspective view showing the light converting units.
FIG. 4 is a cross-sectional view showing a section cut along AA 'in FIG.
5 to 7 are views showing a process of manufacturing the light conversion member according to the embodiment.
FIG. 7 is a perspective view illustrating light-converting portions according to another embodiment.
8 is a cross-sectional view showing one end surface of the light conversion member according to another embodiment.

In the description of the embodiments, it is described that each substrate, frame, sheet, layer or pattern is formed "on" or "under" each substrate, frame, sheet, In this case, "on" and "under " all include being formed either directly or indirectly through another element. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment. FIG. 2 is a perspective view showing the light conversion member according to the embodiment. FIG. 3 is a perspective view showing the light converting units. 4 is a cross-sectional view showing a section cut along the line A-A in Fig. 5 to 7 are views showing a process of manufacturing the light conversion member according to the embodiment. FIG. 7 is a perspective view illustrating light-converting portions according to another embodiment. 8 is a cross-sectional view showing one end surface of the light conversion member according to another embodiment.

1 to 8, 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 a 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 second prism sheet 504 and the liquid crystal panel 20. More specifically, the light conversion member 501 may be closest to the liquid crystal panel 20. The light conversion member 501 can convert the wavelength of the incident light and emit the light upward. More specifically, the photo-conversion member 501 can convert the wavelength of the incident light and output directly to the liquid crystal panel 20.

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 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, 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 to 4, the light conversion member 501 includes a lower substrate 510, an upper substrate 520, a plurality of light conversion portions 530 and 540, a sealing layer 550, (560).

The lower substrate 510 is disposed below the light converters 530 and 540. The lower substrate 510 is disposed below the liquid crystal panel 20. The lower substrate 510 is transparent and flexible.

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 sealing layer 550. The upper substrate 520 is transparent and flexible. The upper substrate 520 may be in close contact with the upper surface of the sealing layer 550.

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 converting units 530 and 540 and the sealing layer 550. The lower substrate 510 and the upper substrate 520 support the light converters 530 and 540 and the sealing layer 550. The lower substrate 510 and the upper substrate 520 protect the light conversion layer 530 from external physical impacts. The lower substrate 510 may be in direct contact with the light converting portions 530 and 540 and the sealing layer 550. In addition, the upper substrate 520 may be in direct contact with the sealing layer 550.

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 converters 530 and 540 from external chemical impacts such as moisture and / or oxygen.

The light converters 530 and 540 are interposed between the lower substrate 510 and the upper substrate 520. The light converters 530 and 540 may be in close contact with the upper surface of the lower substrate 510. That is, the light converters 530 and 540 may be disposed directly on the upper surface of the lower substrate 510.

As shown in FIGS. 3 and 4, the light converters 530 and 540 may be spaced apart from each other. That is, the light converters 530 and 540 may form a pattern on the lower substrate 510. In addition, the light converters 530 and 540 may have a rectangular planar shape.

That is, the light conversion member 501 can be divided into a region where the light converters 530 and 540 are disposed and an area where the light converters 530 and 540 are not disposed. That is, the upper surface of the lower substrate 510 may be exposed in a region between the light converters 530 and 540.

Accordingly, the light conversion member 501 can define a plurality of light conversion regions CA and a plurality of transmission regions TA. That is, the light conversion member 501 includes the light conversion regions CA and the transmission regions TA.

The light conversion regions CA are regions where the light conversion portions 530 and 540 are disposed. Accordingly, most of the light incident on the light conversion regions CA can be converted into light having a different wavelength. A part of the light incident on the photo-conversion regions CA can be transmitted without being converted.

The transmissive areas TA are areas where the light converters 530 and 540 are not disposed. Accordingly, the light incident on the transmissive areas TA is transmitted without being converted. An air layer may be present in the transmissive area TA, or a transparent material may be disposed.

Each of the photo-conversion units includes a host 532, 542, and a plurality of photo-conversion particles 531, 541.

The host (532, 542) surrounds the photo-conversion particles (531, 541). That is, the hosts 532 and 542 uniformly disperse the light conversion particles 531 and 541 therein. The host 532 and 542 may be made of a polymer such as a silicone resin or the like. The hosts 532 and 542 are transparent. That is, the host 532 and 542 may be formed of a transparent polymer.

The hosts 532 and 542 are disposed between the lower substrate 510 and the upper substrate 520. The host 532 and 542 may be in close contact with the upper surface of the lower substrate 510. In addition, the host 532 and 542 may be spaced apart from the upper substrate 520.

The photo-conversion particles 531 and 541 are disposed between the lower substrate 510 and the upper substrate 520. More specifically, the photoconversion particles 531 and 541 are uniformly dispersed in the host 532 and 542, and the host 532 and 542 are disposed between the lower substrate 510 and the upper substrate 520 .

The light conversion particles 531 and 541 convert the wavelength of the light emitted from the light emitting diodes 400. The light conversion particles 531 and 541 receive the light emitted from the light emitting diodes 400 and convert the wavelength. For example, the light conversion particles 531 and 541 may convert the blue light emitted from the light emitting diodes 400 into red light. That is, the light conversion particles 531 and 541 can convert the blue light into red light having a wavelength range of about 630 nm to about 660 nm.

When the light emitting diodes 400 are blue light emitting diodes that generate blue light, the light conversion particles 531 and 541 that convert blue light into red light may be used.

The photo-conversion particles 531 and 541 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 between 1 nm and 15 nm. More specifically, the diameter of the quantum dot can be from about 8 nm to about 11 nm.

The wavelength of the light emitted from the quantum dot can be adjusted according to the size of the quantum dot. 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 light converters 530 and 540 may be a plurality of first light converters 530 and a plurality of second light converters 540. That is, the light converters 530 and 540 may be divided into the first light converters 530 and the second light converters 540.

The first light converting units 530 may convert incident light into light of a first wavelength band. For example, the first light converting units 530 can convert incident blue light into green light having a wavelength range of about 500 nm to about 599 nm.

Each first photo-conversion unit 530 includes a first host 532 and a plurality of first photo-conversion particles 531. The first photoconversion particles 531 are disposed in the first host 532. The first light conversion particles 531 may convert the blue light into green light having a wavelength range of about 500 nm to about 599 nm.

The second light converting units 540 may convert incident light into light of a second wavelength band. For example, the second light converting units 540 may convert incident blue light into red light having a wavelength range of about 600 nm to about 700 nm.

Each second light conversion portion 540 includes a second host 542 and a plurality of second light conversion particles 532. The second photoconversion particles 532 are disposed in the second host 542. The second light conversion particles 532 may convert the blue light into red light having a wavelength range of about 600 nm to about 700 nm. The second light conversion particles 532 may have a larger diameter than the first light conversion particles 531.

Each of the photo-conversion regions CA may be divided into a first photo-conversion region CA1 and a second photo-conversion region. The first light conversion portion 530 is disposed in the first light conversion region CA1. The second light conversion portion 540 is disposed in the second light conversion region CA2. Accordingly, the first photoconversion area CA1 converts incident light into green light, and the second photoconversion area CA2 converts incident light into red light.

The width of the first photo-conversion region CA1 may be about 1 mm to about 10 mm. The width of the second light conversion region CA2 may be about 1 mm to about 10 mm. The width of the transmissive area TA may be about 1 mm to about 10 mm.

The first light conversion region CA1, the second light conversion region CA2, and the transmission region TA may have a polygonal shape. More specifically, the first photo-conversion region CA1, the second photo-conversion region CA2, and the transmission region TA may have a rectangular shape. More specifically, the first photo-conversion region CA1, the second photo-conversion region CA2, and the transmission region TA may have a rectangular shape.

The first photoconversion area CA1, the second photoconversion area CA2 and the transmissive area TA may be arranged in a matrix form. Alternatively, the first photoconversion area CA1, the second photoconversion area CA2 and the transmissive area TA may be arranged in a mosaic form. Alternatively, the first photo-conversion region CA1, the second photo-conversion region CA2, and the transmissive region TA may be arranged in a stripe form.

The sealing layer 550 is disposed on the lower substrate 510. In addition, the sealing layer 550 covers the light converters 530 and 540. The sealing layer 550 is disposed on the side surfaces and the upper surface of the light converters 530 and 540. More specifically, the sealing layer 550 is in direct contact with the side surfaces and the upper surface of the light converting portions 530 and 540. Further, the sealing layer 550 covers the side surfaces and the surfaces of the light converting portions 530 and 540. The sealing layer 550 is in close contact with the side surfaces and the upper surface of the light converting portions 530 and 540. That is, the sealing layer 550 is coated on the upper surface of the lower substrate 510, side surfaces and upper surfaces of the light converting portions 530 and 540. That is, the sealing layer 550 is also disposed in a space between the light converters 530 and 540. That is, the sealing layer 550 may be filled in the transmissive area TA.

The sealing layer 550 is disposed between the lower substrate 510 and the upper substrate 520. The sealing layer 550 may be in direct contact with the lower substrate 510 and the upper substrate 520. The sealing layer 550 may be entirely bonded to the lower surface of the upper substrate 520.

The sealing layer 550 is transparent. The sealing layer 550 may be a polymer. Examples of the material used for the sealing layer 550 include a silicone resin, a perylene resin, and an epoxy resin. The silicone resin may be formed by curing polysiloxane or siloxane oligomer. The epoxy resin may be a hydrogenated epoxy resin, a butadiene epoxy resin, or a fluorine epoxy resin.

The side protection portion 560 is disposed on a side surface of the sealing layer 550. More specifically, the side protection portion 560 covers the side surfaces of the sealing layer 550, the upper substrate 520, and the lower substrate 510.

The side protection portion 560 and the upper substrate 520 may be omitted. That is, the light conversion member 501 may perform a unique function as the lower substrate 510, the light conversion portions 530 and 540, and the sealing layer 550.

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 photo-conversion member 501 may be formed by the following process.

Referring to FIG. 5, a first resin composition including a plurality of first photo-conversion particles 531 is formed. The first resin composition may include a silicone resin, an epoxy resin or an acrylic resin. Further, the first resin composition may be added with a solvent such as toluene, hexane or chloroform. The solvent may be added to the resin composition at a ratio of about 10 wt% to about 30 wt%.

The first resin composition may further comprise an adhesive, an adhesive, or the like as an organic binder. Accordingly, the viscosity of the first resin composition may be about 450 cPs to about 30000 cPs. Further, in the first resin composition, the photo-conversion particles 531 and 541 can be uniformly dispersed by a mechanical method.

In addition, a second resin composition comprising a plurality of second photo-conversion particles 532 is formed. The resin contained in the second resin composition may be substantially the same as the resin contained in the first resin composition.

Thereafter, the first resin composition and the second resin composition are coated on the lower substrate 510 by a screen printing process, an inkjet process, or the like. That is, the first resin composition and the second resin composition are coated on the lower substrate 510 in a patterned state. Thereafter, the coated first resin composition, the solvent contained in the second resin composition, and the like are removed, and the first resin composition and the second resin composition are cured by light and / or heat, Portions 530 and 540 are formed.

Referring to FIG. 6, a third resin composition is coated on the light converting portions 530 and 540. The third resin composition may be uniformly coated on the upper surface of the lower substrate 510 and the upper and lower surfaces of the light converting portions 530 and 540. The third resin composition may be coated on the lower substrate 510 by spray coating, spin coating, or the like. The third resin composition may include a perylene resin, a polysiloxane or a siloxane oligomer, an epoxy resin, or the like.

Thereafter, the coated third resin composition is cured by light and / or heat, and the sealing layer 550 may be formed.

Referring to FIG. 7, an upper substrate 520 is laminated on the sealing layer 550. The side protective portions 560 are formed on the side surfaces of the sealing layer 550, the upper substrate 520, and the lower substrate 510. Accordingly, the light conversion member 501 can be formed.

8 and 9, the transmissive area TA may have a slit structure. That is, the transmissive area TA may have a shape extending in one direction. The width of the transmissive region TA may be about 1 [mu] m to about 1 mm. The transmissive area TA may be disposed between the first and second light conversion areas CA1 and CA2.

A guide portion 551 may be disposed in the transmissive region TA. The guide part 551 is disposed between the first light converting part 530 and the second light converting part 540. The guide part 551 may be a transparent material filled between the first light conversion part 530 and the second light conversion part 540. That is, a part of the sealing layer 550 may be the guide portion 551.

The guide part 551 may be in direct contact with the side surfaces of the first and second light converting parts 530 and 540. At this time, the refractive index of the guide portion 551 may be greater than the refractive index of the first light converting portion 530 and the refractive index of the second light converting portion 540. More specifically, the refractive index of the guide portion 551 may be greater than the refractive index of the first host 532 and the refractive index of the second host 542. At this time, the refractive index of the guide portion 551 may be larger than the refractive index of the first host 532 and the refractive index of the second host 542 by about 0.1 to about 0.8.

Accordingly, the total internal reflection can occur at the interface between the guide portion 551 and the first host 532, and at the interface between the guide portion 551 and the second host 542. Therefore, the light incident on the transmissive area TA can be effectively transmitted upward.

Since the transmissive area TA has a slit structure, light passing through the transmissive area TA can be easily diffracted. Accordingly, the light passing through the transmissive area TA is effectively dispersed and can be emitted upward.

The diffusion sheet 502 is disposed on the light guide plate 200. 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 light conversion member 501. More specifically, the liquid crystal panel 20 may be in direct contact with the light conversion member 501. More specifically, the light conversion member 501 may be adhered to the liquid crystal panel 20. [

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 thin film transistor substrate 21, a color filter substrate 22, and a liquid crystal layer 23. The liquid crystal panel 20 includes polarizing filters disposed on the lower surface of the thin film transistor substrate 21 and the upper surface of the color filter substrate 22, respectively.

The thin film transistor substrate 21 is opposed to the color filter substrate 22. The thin film transistor substrate 21 can apply an electric field to the liquid crystal layer 23 together with the color filter substrate 22 in pixel units. The thin film transistor substrate 21 includes a first transparent substrate 610 and a plurality of pixel electrodes 620.

The liquid crystal layer 23 is interposed between the thin film transistor substrate 21 and the color filter substrate 22. More specifically, the liquid crystal layer 23 is interposed between the pixel electrode 620 and the common electrode 740. An alignment film may be interposed between the thin film transistor substrate 21 and the liquid crystal layer 23 and between the color filter substrate 22 and the liquid crystal layer 23. [

The liquid crystal layer 23 is aligned by the electric field between the common electrode 740 and the pixel electrodes 620. Accordingly, the liquid crystal layer 23 can control the characteristics of light passing through the liquid crystal layer 23 in units of pixels. That is, the liquid crystal layer 23 displays the image by the applied electric field together with the polarizing filters disposed under the first transparent substrate 610 and the second transparent substrate 710, respectively.

As the liquid crystal layer 23, a smectic liquid crystal, a nematic liquid crystal, a cholesteric liquid crystal, or the like can be used.

As described above, the liquid crystal display according to the embodiment includes the light conversion regions CA and the transmissive regions TA. Accordingly, in the liquid crystal display device according to the embodiment, the light can be displayed by using the light having the desired color coordinates by using the light conversion member 501. [ That is, the areas of the light conversion areas CA and the transmission areas TA are appropriately adjusted, and the light conversion member 501 can emit light having an optimal color coordinate.

Also, the transmissive regions TA may have a slit structure. That is, the transmissive areas TA have a shape extending in one direction and may have a small width. Accordingly, when light from the light emitting diode 400 passes through the transmissive region TA, it can be spread widely by diffraction.

In particular, the light emitting diode 400 generates blue light, and the light conversion regions CA convert the blue light into green light and red light. At this time, since the blue light passing through the transmissive areas TA spreads widely, the display device according to the embodiment can have a uniform color reproducibility as a whole.

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

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

Claims (10)

Reflective sheet;
A light guide plate disposed on the reflective sheet;
A light source disposed on a side surface of the light guide plate;
A light conversion member disposed on the light guide plate and through 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
A lower substrate;
A plurality of light conversion regions disposed on the lower substrate;
A plurality of transmissive regions disposed between the light conversion regions;
A sealing layer disposed on the lower substrate and covering a side surface, an upper surface, and transmissive regions of the light conversion regions;
An upper substrate disposed on the sealing layer; And
And a side protection portion disposed on both sides of the lower substrate, the upper substrate, and the sealing layer,
Wherein the plurality of light conversion regions include a first light conversion region for converting light from the light source into light of a first wavelength band and a second light conversion region for converting light from the light source to light of a second wavelength band,
Wherein the transmissive region has a slit structure extending in one direction between the first and second light conversion regions,
Wherein the width of the transmissive area is smaller than the width of each of the first and second light conversion areas. The display device according to claim 1, wherein the light conversion regions and the transmission regions have a polygonal or rectangular shape. The display device of claim 2, wherein the light conversion regions and the transmission regions have a rectangular shape. 2. The method of claim 1, wherein the transmissive regions have a shape that extends,
Wherein the width of the transmission regions is 1 to 1 mm, and the width of the light conversion regions is 1 to 10 mm. delete delete delete The light emitting device of claim 1, further comprising: a plurality of light converters disposed in the light conversion regions, respectively; And a plurality of guide portions disposed in the transmission regions, respectively,
The light-converting portions include a transparent host; And a plurality of photo-conversion particles disposed within the host,
Wherein the guide portions are in direct contact with the host, the refractive index of the guide portions is greater than the refractive index of the host,
Wherein total reflection occurs at the interface between the guide part and the host. delete delete

Images