KR102296072B1 - Display device - Google Patents

Abstract

A display device according to an embodiment of the present invention includes a display panel and a color conversion panel positioned on the display panel, wherein the color conversion panel includes a color conversion media layer, a scatterer, and a dye adsorbed to the scatterer; and a scattering layer including at least one of the pigments.

Description

display device {DISPLAY DEVICE}

The present invention relates to a display device.

A liquid crystal display device is one of the most widely used flat panel display devices at present. It consists of two display panels on which electrodes are disposed and a liquid crystal layer interposed therebetween. A display device that controls the amount of transmitted light.

Among the liquid crystal display devices, currently mainly used is a structure in which an electric field generating electrode is provided on two display panels, respectively. Among them, a plurality of thin film transistors and pixel electrodes are arranged in a matrix on one display panel (hereinafter referred to as a 'thin film transistor display panel'), and red, green, A structure in which a blue color filter is disposed and a common electrode is covered over its front surface is the mainstream.

However, in such a liquid crystal display, light loss occurs in the polarizing plate and the color filter. In order to reduce the light loss and realize a high-efficiency liquid crystal display, a PL-liquid crystal display device including a color conversion material (Photo-Luminescent LCD) has been proposed.

A PL-LCD device uses a color conversion media (CCM) instead of a color filter. may be supplied to the pixel. This phenomenon is called optical cross-talk, and accordingly, a problem of poor color reproducibility occurs.

SUMMARY The technical problem to be solved by the present invention is to provide a display device with an improved contrast ratio by preventing color mixing of a color conversion panel and increasing light output efficiency.

In order to solve the above problems, a display device according to an embodiment of the present invention includes a display panel and a color conversion panel positioned on the display panel, wherein the color conversion panel includes a color conversion media layer, a scatterer, and the and a scattering layer including at least one of a dye and a pigment adsorbed to the scatterer.

The color conversion media layer may include at least one of a phosphor and a quantum dot.

The color conversion media layer may include a photosensitive resin, and at least one of the phosphor and the quantum dots may be dispersed in the photosensitive resin.

The scatterer may include at least one _{of TiO 2} , ZrO ₂ , Al ₂ O ₃ , In ₂ O ₃ , ZnO, SnO ₂ , Sb ₂ O _{3 , and ITO.}

The density of the scattering layer may be greater than the density of the color conversion media layer.

The refractive index of the scattering layer may be about 1.5 or more.

The color conversion media layer may include a red color conversion media layer, a green color conversion media layer, and a transparent layer.

It may further include a light blocking member positioned between the adjacent red color conversion media layer, the green color conversion media layer, and the transparent layer.

The transparent layer may not include the phosphor and the quantum dots.

The scattering layer positioned on the transparent layer may not include the dye and the pigment.

The dyes and pigments can absorb blue light.

A light assembly for supplying light to the display panel and the color conversion panel may be further included.

The light assembly may be a light emitting diode.

The light emitting diode may emit a specific wavelength band, such as ultraviolet or blue light.

The display panel may be positioned between the light assembly and the color conversion panel.

The display panel may further include a liquid crystal panel and polarizing plates positioned on both surfaces of the liquid crystal panel.

The liquid crystal panel includes a thin film transistor positioned on a first insulating substrate, a pixel electrode connected to the thin film transistor, a second insulating substrate spaced apart from and facing the first insulating substrate, a common electrode positioned on the second insulating substrate, and the A liquid crystal layer positioned between the pixel electrode and the common electrode may be included.

The liquid crystal panel includes an insulating substrate, a thin film transistor positioned on the insulating substrate, a pixel electrode connected to the thin film transistor, a roof layer positioned to face the pixel electrode, and a plurality of microstructures positioned between the pixel electrode and the roof layer. It may include a liquid crystal layer filling the space.

The display device according to an embodiment of the present invention may provide better display quality through improved color gamut and contrast ratio, and may provide a wide viewing angle through quantum dots.

1 is a schematic cross-sectional view of a display device according to an exemplary embodiment.
2 is a cross-sectional view of a color conversion panel according to an embodiment of the present invention.
3 is a cross-sectional view of a red color conversion media layer according to an embodiment of the present invention.
4 is a cross-sectional view of a green color conversion media layer according to an embodiment of the present invention.
5 is a cross-sectional view of a transparent layer according to an embodiment of the present invention.
6, 7, 8 and 9 are cross-sectional views according to a manufacturing process of a color conversion panel according to an embodiment of the present invention.
10 is a plan view of a display device according to an exemplary embodiment.
11 is a cross-sectional view taken along line XI-XI' of FIG. 10 .
12 is a plan view illustrating a pixel of a display device according to an exemplary embodiment, and FIG. 13 is a cross-sectional view taken along line XIII-XIII′ of FIG. 12 .
14 to 15 are color coordinate images for Examples and Comparative Examples of the present invention.

With reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly express various layers and regions in the drawings, the thicknesses are enlarged. Throughout the specification, like reference numerals are assigned to similar parts. When a part, such as a layer, film, region, plate, etc., is "on" another part, it includes not only the case where it is "directly on" another part, but also the case where there is another part in between. Conversely, when we say that a part is "just above" another part, we mean that there is no other part in the middle.

Hereinafter, a display device according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 5 . 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a color conversion panel according to an embodiment of the present invention, and FIG. 3 is a red color according to an embodiment of the present invention A cross-sectional view of a conversion media layer, FIG. 4 is a cross-sectional view of a green color conversion media layer according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view of a transparent layer according to an embodiment of the present invention.

First, a display device according to an exemplary embodiment of the present invention will be briefly described with reference to FIGS. 1 and 2 . The display device includes a color conversion panel 30 , a display panel 10 , and a light assembly 500 .

First, the display panel 10 may include a liquid crystal panel 50 displaying an image and polarizing plates 12 and 22 positioned on both surfaces of the liquid crystal panel 50 . A first polarizing plate 12 and a second polarizing plate 22 for polarizing light incident from the light assembly 500 are positioned on both sides of the liquid crystal panel 50 . The liquid crystal panel 50 will be described in more detail below with reference to FIGS. 10 to 13 .

The light assembly 500 is located under the first polarizing plate 12 and includes a light source that generates light, a light guide plate that receives the light and guides the received light toward the display panel 10 and the color conversion panel 30 (not shown). city) may be included.

As an example of the present invention, the light assembly 500 may include at least one light emitting diode, and may be, for example, a blue light emitting diode. The light source according to the present invention may be an edge-type light assembly disposed on at least one side of the light guide plate, or a direct-type light source in which the light source of the light assembly 500 is positioned directly below the light guide plate (not shown). However, the present invention is not limited thereto.

The color conversion panel 30 according to the embodiment of the present invention may be positioned on the display panel 10 , and more specifically, may be positioned on and in contact with the second polarizing plate 22 .

2, the color conversion panel 30 includes a plurality of color conversion media layers 330, 330R, 330G, 330W and a plurality of color conversion media layers 330, 330R, 330G, which are positioned on the substrate 310. 330W) and a light blocking member 320 positioned between them.

The light blocking member 320 partitions an area in which the red color conversion media layer 330R, the green color conversion media layer 330G, and the transparent layer 330W are disposed, the red color conversion media layer 330R, and the green color conversion media layer The 330G and the transparent layer 330W are positioned between the light blocking member 320 .

The red color conversion media layer 330R converts the blue light supplied from the light assembly 500 into red. To this end, the red color conversion media layer 330R may include a red phosphor, and the red phosphor may include (Ca, Sr, Ba)S, (Ca, Sr, Ba) ₂ Si ₅ N ₈ , Cazen (CaAlSiN ₃ ), It may be at least one of _{CaMoO 4} and Eu ₂ Si ₅ N _{8 .}

The green color conversion media layer 330G converts the blue light supplied from the light assembly 500 into green. The green color conversion media layer 330G may include a green phosphor, wherein the green phosphor is yttrium aluminum garnet (YAG), (Ca, Sr, Ba) ₂ SiO ₄ , SrGa ₂ S ₄ , BAM, alpha sialon (α-SiAlON), beta sialon (β-SiAlON), Ca ₃ Sc ₂ Si ₃ O ₁₂ , Tb ₃ Al ₅ O ₁₂ , BaSiO ₄ , CaAlSiON, (Sr _{1 - x} Ba _x )Si ₂ O _It may be at least one material of 2 N _{2 .} In this case, x may be any number between 0 and 1.

In addition, the red color conversion media layer 330R and the green color conversion media layer 330G may include quantum dots that convert colors instead of phosphors. The quantum dot may be selected from a group II-VI compound, a group IV-VI compound, a group IV element, a group IV compound, and combinations thereof.

Group II-VI compounds include diatomic compounds selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgZnTe, HgZnS, HgZnSe, HgZnTe, MgZnS, MgZnTe, MgZnS and mixtures thereof bovine compounds; and HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and mixtures thereof. The group III-V compound is a binary compound selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; a ternary compound selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, and mixtures thereof; and quaternary compounds selected from the group consisting of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof. The group IV-VI compound is a binary compound selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; a ternary compound selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; and a quaternary compound selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof. The group IV element may be selected from the group consisting of Si, Ge, and mixtures thereof. The group IV compound may be a di-element compound selected from the group consisting of SiC, SiGe, and mixtures thereof.

In this case, the binary compound, the ternary compound, or the quaternary compound may be present in the particle at a uniform concentration, or may be present in the same particle as the concentration distribution is partially divided into different states. Also, one quantum dot may have a core/shell structure surrounding another quantum dot. The interface between the core and the shell may have a concentration gradient in which the concentration of the element present in the shell decreases toward the center.

A quantum dot may have a full width of half maximum (FWHM) of an emission wavelength spectrum of about 45 nm or less, preferably about 40 nm or less, and more preferably about 30 nm or less. In this range, color purity and color reproducibility can be improved. In addition, since the light emitted through the quantum dot is emitted in all directions, a wide viewing angle may be improved.

In addition, the shape of the quantum dot is not particularly limited to a shape generally used in the art, but more specifically, spherical, pyramidal, multi-arm, or cubic nanoparticles, nanotubes. , nanowires, nanofibers, nanoplatelets, and the like can be used.

The transparent layer 330W is made of a transparent polymer, and the blue light supplied from the light assembly 500 transmits and exhibits blue color. The transparent layer 330W in the region emitting blue light may emit the incident blue light as it is without a separate phosphor or quantum dot.

In this case, the material of the red color conversion media layer, the green color conversion media layer, and the transparent layer may be a photosensitive resin, and thus may be formed through a photolithography process.

Next, as shown in FIG. 2 , the color conversion panel 30 according to an embodiment of the present invention further includes a scattering layer 340 positioned on the substrate 310 . The scattering layer 340 includes a scatterer 345 and at least one of pigments and dyes 347R and 347G adsorbed to the scatterer 345 .

The scattering layer 340 is formed to be phase-separated from the color conversion media layer 330 during the manufacturing process of the color conversion panel 30 . The scattering layer 340 may be surface-treated to have a higher density or different characteristics to be phase-separated from the color conversion media layer 330 .

The material of the scatterer 345 may be any one of TiO2, ZrO ₂ , Al ₂ O ₃ , In ₂ O ₃ , ZnO, SnO ₂ , Sb ₂ O ₃ and ITO, but is not limited thereto, and scatters incident light. Any material that makes it possible is possible. The scatterer 345 scatters incident light to increase the amount of light emitted through the color conversion panel 30 or to make the front luminance and the side luminance uniform.

The scatterer 345 according to an embodiment of the present invention has a refractive index of about 1.5 or more. The scattering layer 340 including the scattering body 345 having such a refractive index redirects a portion of the emitted light to the color conversion media layers 330R and 330G to increase light output efficiency. That is, the scattering layer 340 may provide more light to have improved light efficiency by scattering the incident blue color.

At least one of the pigments and dyes 347R and 347G according to an embodiment of the present invention is connected (or adsorbed) to the scatterer 345 to absorb blue light passing through the color conversion media layers 330R and 330G.

Pigments and dyes 347R, 347G can be any material for absorbing blue light. The dye or pigment prevents deterioration of display quality due to color mixing when blue light passing through the color conversion media layer 330 is emitted as it is from the red color conversion media layer 330R or the green color conversion media layer 330G. .

In summary, the color conversion panel 30 according to the embodiment of the present invention includes a color conversion media layer 330 and a scattering layer 340 . Components of the color conversion media layer 330 and the scattering layer 340 may be different depending on the color of the emitted light. That is, the configuration of the color conversion media layer 330 and the scattering layer 340 may be partially different according to regions emitting red, green, and blue light. Hereinafter, the color conversion media layer 330 and the scattering layer 340 according to the color emitted will be described in more detail.

First, looking at the region of the color conversion panel 30 that emits red light with reference to FIG. 3 , the red color conversion media layer 330R includes at least one of a phosphor and a quantum dot 331R that converts incident blue light into red light. do.

The scattering layer 340R in contact with the red color conversion media layer 330R scatters the light emitted from the red color conversion media layer 330R or returns blue light that is not converted to red by the phosphor or quantum dot 331R. It may be scattered by the red color conversion media layer 330R. The light scattered back to the red color conversion media layer 330R may be converted into red light by a phosphor or quantum dot 331R and emitted.

In addition, the pigment or dye 347R positioned in the scattering layer 340R and adsorbed to the scattering body 345 is blue light that is not converted to red by the phosphor or quantum dot 331R positioned in the red color conversion media layer 330R. By absorbing the red light, blue light is prevented from being emitted in the area where red light is emitted.

Accordingly, the color conversion panel emitting red light according to an embodiment of the present invention may have excellent color reproducibility without color mixing and improved light output efficiency by the scattering body.

Next, with reference to FIG. 4 , the color conversion panel 30 emitting green light will be described. First, the green color conversion media layer 330G onto which blue light is incident includes a phosphor or quantum dot 331G that converts the incident blue light into green light.

The scattering layer 340G in contact with the green color conversion media layer 330G scatters the light emitted from the green color conversion media layer 330G or re-colors the blue light that is not converted to green by the phosphor or quantum dot 331G. It may scatter to the conversion media layer 330G. Again, light scattered by the green color conversion media layer 330G may be converted into green light by a phosphor or quantum dot 331G and emitted.

In addition, the pigment or dye 347G adsorbed to the scatterer 345 positioned in the scattering layer 340G is not converted to green by the phosphor or quantum dot 331G positioned in the green color conversion media layer 330G. By absorbing blue light, it prevents the blue light from being emitted from the area where the green light is emitted.

Accordingly, the color conversion panel emitting green light according to an embodiment of the present invention may have excellent color reproducibility without color mixing and improved light output efficiency by the scattering body.

Next, the color conversion panel 30 emitting blue light will be described with reference to FIG. 5 . The color conversion media layer 330W corresponding to the region emitting blue light includes a material (eg, a polymer such as a photosensitive resin) that emits light incident blue without a separate phosphor or quantum dot.

As such, in the region where the incident light is emitted as it is, a separate phosphor or quantum dot is not located, and a pigment and a dye absorbing blue light are also not located. Accordingly, the color conversion panel 30 emitting blue light includes a scattering layer 340W including a scattering body 345 scattering incoming light. According to this embodiment, the color conversion media layer 330W and the scattering layer 340W may be formed without separate layers.

According to the above-described display device, an exemplary embodiment of the present invention provides a color conversion panel with improved color reproducibility by increasing light output efficiency and preventing color mixing, thereby providing a display device with better display quality.

Hereinafter, a method of manufacturing a color conversion panel according to an embodiment of the present invention will be described with reference to FIGS. 6 to 9 . 6 to 9 are cross-sectional views along a manufacturing process of a color conversion panel according to an embodiment of the present invention.

First, as shown in FIG. 6 , a scattering body 345 in which at least one of a pigment and a dye 347 is adsorbed is prepared. In addition, a photosensitive resin including a red or green phosphor (or quantum dots) 331 is prepared. Meanwhile, the photosensitive resin for manufacturing the transparent layer may not include a phosphor or quantum dots.

A photosensitive resin for preparing a color conversion media layer is prepared by dispersing the prepared photosensitive resin and a scattering body to which a pigment or dye is adsorbed.

Next, as shown in FIG. 7 , a photosensitive resin in which a phosphor (or quantum dot) 331 and a scatterer 345 to which a pigment or dye 347 is adsorbed are dispersed on the insulating substrate 310 on which the light blocking member 320 is positioned. Apply.

Then, after a predetermined period of time, as shown in FIG. 8 , the scatterers 345 dispersed in the photosensitive resin and the pigments or dyes 347 adsorbed thereto are phase-separated on the insulating substrate 310 according to differences in density or surface properties.

A typical photosensitive resin has a density of about 1.1 to 1.2 g/cm ³ , and the scattering body 345 made of titanium oxide according to an embodiment of the present invention may have a density ^{of about 4.3 g/cm 3 .} In addition, a general photosensitive resin is non-polar, but a scatterer to which a pigment or dye is adsorbed may have a polarity. Therefore, this difference in physical properties may cause phase separation over time.

Next, as shown in FIG. 9 , a scattering layer 340 and a color conversion media layer 330 positioned between the light blocking members 320 are formed using a photo lithography method. In the above, the color conversion media layer and the scattering layer formed using the photolithography method have been described, but the present invention is not limited thereto, and may be manufactured using a printing method, and is not limited to any manufacturing method.

Hereinafter, a display device according to an exemplary embodiment of the present invention will be described with reference to FIGS. 10 to 11 . 10 is a plan view of a display device according to an exemplary embodiment, and FIG. 11 is a cross-sectional view taken along line XI-XI′ of FIG. 10 .

10 to 11 , a display device according to an embodiment of the present invention includes a light assembly 500 , a display panel 10 positioned on the light assembly 500 , and a color conversion panel positioned on the display panel 10 ( 30). The light assembly 500 and the color conversion panel 30 according to the embodiment of the present invention are the same as the light assembly and the color conversion panel described above with reference to FIG. 1 , and thus a description thereof will be omitted.

First, the display panel 10 includes a lower panel 100 including a thin film transistor, an upper panel 200 including a second insulating substrate 210 facing the lower panel 100, and a lower panel to display an image. and a liquid crystal panel 50 including a liquid crystal layer 3 interposed between 100 and the upper panel 200 .

Polarizing plates 12 and 22 are positioned on both sides of the liquid crystal panel 50 , and at least one of a coated polarizer and a wire grid polarizer may be used as the polarizing plate 12 . The polarizing plate 12 may be positioned on one surface of the upper panel 200 in various methods such as a film form, an application form, an attachment form, and the like. However, this description corresponds to an example and is not limited thereto.

A plurality of pixel electrodes are positioned in a matrix form on the first insulating substrate 110 included in the lower panel 100 .

A gate line 121 extending in a row direction and including a gate electrode 124 on the first insulating substrate 110 , a gate insulating layer 140 positioned on the gate line 121 , and a semiconductor positioned on the gate insulating layer 140 . layer 154 , a data line 171 and a drain electrode 175 disposed on the semiconductor layer 154 , extending in the column direction, and including a source electrode 173 , and a data line 171 and a drain electrode 175 . A pixel electrode 191 physically and electrically connected to the drain electrode 175 through the passivation layer 180 and the contact hole 185 positioned thereon is positioned.

The semiconductor layer 154 positioned on the gate electrode 124 forms a channel layer in a region exposed by the source electrode 173 and the drain electrode 175 , and includes the gate electrode 124 , the semiconductor layer 154 , and the source. The electrode 173 and the drain electrode 175 form one thin film transistor.

Next, the light blocking member 220 is positioned on the second insulating substrate 210 spaced apart from the first insulating substrate 110 . A flat layer 250 providing a flat surface may be disposed on the light blocking member 220 , and the common electrode 270 is disposed thereon. According to an embodiment of the present invention, the flat film 250 may be omitted.

The common electrode 270 to which the common voltage is applied forms an electric field with the pixel electrode 191 to arrange the liquid crystal molecules 31 positioned in the liquid crystal layer 3 .

The liquid crystal layer 3 includes a plurality of liquid crystal molecules 31 , and the arrangement direction of the liquid crystal molecules 31 is controlled by an electric field between the pixel electrode 191 and the common electrode 270 . An image may be displayed by controlling transmittance of light received from the light assembly 500 according to the arrangement of liquid crystal molecules.

In the present embodiment, the liquid crystal display panel in which the liquid crystal panel forms a vertical electric field has been described, but the present invention is not limited thereto, and the liquid crystal display panel, plasma display panel (PDP), and organic light emitting diode (OLED) display apparatus forming a horizontal electric field are not limited thereto. Display, OLED), Surface conduction Electron-emitter Display (SED), Field Emission Display (FED), Vacuum Fluorescent Display (VFD), Electronic paper It may be a display device such as (E-Paper).

As described above, the display device according to the exemplary embodiment of the present invention can provide a display device having excellent display quality by improving light output rate and color reproducibility.

Hereinafter, a display device according to an exemplary embodiment of the present invention will be described with reference to FIGS. 12 to 13 . 12 is a plan view illustrating a pixel of a display device according to an exemplary embodiment, and FIG. 13 is a cross-sectional view taken along line XIII-XIII′ of FIG. 12 .

A display device according to an exemplary embodiment includes a display panel 10 , a color conversion panel 30 , and a light assembly 500 . The display panel 10 may be positioned on the light assembly 500 , and the color conversion panel 30 may be positioned on the display panel 10 .

The display panel 10 may include a liquid crystal panel 50 and polarizing plates 12 and 22 positioned on both surfaces of the liquid crystal panel 50 . In this case, the polarizing plate 12 may be one or more of a coating-type polarizer and a wire grid polarizer, and these polarizers 12 and 22 may be used in various methods such as a film form, a coating form, and an attachment form, such as a liquid crystal panel 50 ) can be located on both sides of the However, this description corresponds to an example and is not limited thereto.

Meanwhile, since the color conversion panel 30 and the light assembly 500 included in the display device according to an embodiment of the present invention are also the same as in the above-described embodiment, a detailed description thereof will be omitted below.

Next, the liquid crystal panel 50 according to an embodiment of the present invention will be described in more detail with reference to FIGS. 12 and 13 .

The liquid crystal panel 50 includes a plurality of gate conductors including a plurality of gate lines 121 , a plurality of step-down gate lines 123 , and a plurality of storage electrode lines 131 positioned on the insulating substrate 110 .

The gate line 121 and the step-down gate line 123 mainly extend in a horizontal direction and transmit a gate signal. The gate conductor further includes a first gate electrode 124h and a second gate electrode 124l protruding upward and downward from the gate line 121 , and a third gate electrode 124c protruding upward from the step-down gate line 123 . ) is further included. The first gate electrode 124h and the second gate electrode 124l are connected to each other to form one protrusion. In this case, the protrusion shape of the first, second, and third gate electrodes 124h, 124l, and 124c may be changed.

The storage electrode line 131 also mainly extends in the horizontal direction and transmits a predetermined voltage such as the common voltage Vcom. The storage electrode line 131 includes ends of the storage electrode 129 protruding up and down, a pair of vertical portions 134 extending downward substantially perpendicular to the gate line 121 , and ends of the pair of vertical portions 134 . It includes a horizontal portion 127 that is connected to each other. The horizontal portion 127 includes a capacitive electrode 137 extending downward.

A gate insulating layer 140 is positioned on the gate conductors 121 , 123 , 124h , 124l , 124c , and 131 . The gate insulating layer 140 may be made of an inorganic insulating material such as silicon nitride (SiNx) or silicon oxide (SiOx). Also, the gate insulating layer 140 may be formed of a single layer or a multilayer.

A first semiconductor layer 154h, a second semiconductor layer 154l, and a third semiconductor layer 154c are positioned on the gate insulating layer 140 . The first semiconductor layer 154h may be positioned on the first gate electrode 124h, the second semiconductor layer 154l may be positioned on the second gate electrode 124l, and the third semiconductor layer 154c may be It may be positioned on the third gate electrode 124c. The first semiconductor layer 154h and the second semiconductor layer 154l may be connected to each other, and the second semiconductor layer 154l and the third semiconductor layer 154c may also be connected to each other. Also, the first semiconductor layer 154h may be positioned to extend below the data line 171 . The first to third semiconductor layers 154h, 154l, and 154c may be formed of amorphous silicon, polycrystalline silicon, or metal oxide.

An ohmic contact member (not shown) may be further positioned on the first to third semiconductor layers 154h, 154l, and 154c, respectively. The ohmic contact member may be made of a material such as silicide or n+ hydrogenated amorphous silicon doped with a high concentration of n-type impurities.

On the first to third semiconductor layers 154h, 154l, and 154c, a data line 171, a first source electrode 173h, a second source electrode 173l, a third source electrode 173c, and a second A data conductor including a first drain electrode 175h, a second drain electrode 175l, and a third drain electrode 175c is positioned.

The data line 171 transmits a data signal and mainly extends in a vertical direction to cross the gate line 121 and the step-down gate line 123 . Each data line 171 extends toward the first gate electrode 124h and the second gate electrode 124l and includes a first source electrode 173h and a second source electrode 173l connected to each other.

The first drain electrode 175h, the second drain electrode 175l, and the third drain electrode 175c include a wide end portion and a rod-shaped other end portion. The rod-shaped ends of the first drain electrode 175h and the second drain electrode 175l are partially surrounded by the first source electrode 173h and the second source electrode 173l. One wide end of the second drain electrode 175l is extended again to form the third source electrode 173c bent in a 'U' shape. The wide end 177c of the third drain electrode 175c overlaps the capacitor electrode 137 to form the step-down capacitor Cstd, and the rod-shaped end portion is partially surrounded by the third source electrode 173c.

The first gate electrode 124h, the first source electrode 173h, and the first drain electrode 175h form a first thin film transistor Qh together with the first semiconductor layer 154h, and the second gate electrode ( 124l), the second source electrode 173l, and the second drain electrode 175l form a second thin film transistor Ql together with the second semiconductor layer 154l, and the third gate electrode 124c and the third The source electrode 173c and the third drain electrode 175c form a third thin film transistor Qc together with the third semiconductor layer 154c.

The first semiconductor layer 154h, the second semiconductor layer 154l, and the third semiconductor layer 154c may be linearly connected to each other, and the source electrodes 173h, 173l, 173c and the drain electrodes 175h and 175l , 175c) may have substantially the same planar shape as the data conductors 171 , 173h , 173l , 173c , 175h , 175l , and 175c and the ohmic contact member thereunder.

The first semiconductor layer 154h has a portion exposed between the first source electrode 173h and the first drain electrode 175h without being covered by the first source electrode 173h and the first drain electrode 175h, The second semiconductor layer 154l has a portion exposed between the second source electrode 173l and the second drain electrode 175l without being covered by the second source electrode 173l and the second drain electrode 175l, A portion of the third semiconductor layer 154c that is not covered by the third source electrode 173c and the third drain electrode 175c is exposed between the third source electrode 173c and the third drain electrode 175c.

The data conductors 171 , 173h , 173l , 173c , 175h , 175l , and 175c and the semiconductor layers 154h and 154l exposed between the source electrodes 173h / 173l / 173c and the drain electrodes 175h / 175l / 175c respectively. , 154c), the passivation layer 180 is positioned. The passivation layer 180 may be made of an organic insulating material or an inorganic insulating material, and may be formed of a single layer or multiple layers.

The light blocking member 220 is positioned on the passivation layer 180 . The light blocking member 220 may be formed on the boundary portion of the pixel area PX and the thin film transistor to prevent light leakage.

The first insulating layer 240 may be positioned on the light blocking member 220 . The first insulating layer 240 may be formed of an inorganic insulating material such as silicon nitride (SiNx), silicon oxide (SiOx), or silicon nitride oxide (SiOxNy). The first insulating layer 240 serves to protect the light blocking member 220 made of an organic material, and may be omitted if necessary.

The first insulating layer 240 , the light blocking member 220 , and the passivation layer 180 have a plurality of first contacts exposing the wide end of the first drain electrode 175h and the wide end of the second drain electrode 175l, respectively. A hole 185h and a plurality of second contact holes 185l are formed.

Next, the pixel electrode 191 is positioned on the first insulating layer 240 . The pixel electrode 191 may be formed of a transparent metal material such as indium-tin oxide (ITO), indium-zinc oxide (IZO), or the like.

The pixel electrode 191 is separated from each other with the gate line 121 and the step-down gate line 123 interposed therebetween, and is disposed above and below the pixel area PX with the gate line 121 and the step-down gate line 123 as the center. It is disposed and includes a first subpixel electrode 191h and a second subpixel electrode 191l adjacent in a column direction. That is, the first subpixel electrode 191h and the second subpixel electrode 191l are separated with the first valley V1 interposed therebetween, and the first subpixel electrode 191h is formed in the first subpixel area PXa. ), and the second subpixel electrode 1911l is positioned in the second subpixel area PXb.

The first subpixel electrode 191h and the second subpixel electrode 191l are respectively connected to the first drain electrode 175h and the second drain electrode 175l through the first contact hole 185h and the second contact hole 185l. ) is associated with Accordingly, when the first thin film transistor Qh and the second thin film transistor Ql are in an on state, the data voltage is applied from the first drain electrode 175h and the second drain electrode 175l.

The overall shape of each of the first subpixel electrode 191h and the second subpixel electrode 191l is a rectangle, and the first subpixel electrode 191h and the second subpixel electrode 191l have horizontal stem portions 193h and 193l, respectively. ), and a cross-shaped stem consisting of vertical stem portions 192h and 192l intersecting the horizontal stem portions 193h and 193l. In addition, the first subpixel electrode 191h and the second subpixel electrode 191l have a plurality of minute branches 194h and 194l, respectively, and protrusions protruding downward or upward from edge sides of the subpixel electrodes 191h and 191l, respectively. (197h, 197l).

The pixel electrode 191 is divided into four subregions by horizontal stem portions 193h and 193l and vertical stem portions 192h and 192l. The minute branches 194h and 194l extend obliquely from the horizontal stems 193h and 193l and the vertical stems 192h and 192l, and the extending direction is the gate line 121 or the horizontal stems 193h and 193l. An angle of approximately 45 degrees or 135 degrees may be achieved. Also, the extending directions of the minute branches 194h and 194l of the two neighboring subregions may be orthogonal to each other.

The arrangement of the pixel region, the structure of the thin film transistor, and the shape of the pixel electrode described above are only examples, and the present invention is not limited thereto and various modifications are possible.

Next, the common electrode 270 is positioned to be spaced apart from the pixel electrode 191 at a predetermined distance. A microcavity 105 is formed between the pixel electrode 191 and the common electrode 270 . That is, the microcavity 105 is surrounded by the pixel electrode 191 and the common electrode 270 . The width and width of the microcavity 105 may be variously changed according to the size and resolution of the display device.

The common electrode 270 may be made of a transparent metal material such as indium-tin oxide (ITO) or indium-zinc oxide (IZO). A constant voltage may be applied to the common electrode 270 , and an electric field may be formed between the pixel electrode 191 and the common electrode 270 .

Also, the first alignment layer 11 is positioned on the pixel electrode 191 . The second alignment layer 21 is positioned under the common electrode 270 to face the first alignment layer 11 .

The first alignment layer 11 and the second alignment layer 21 may be formed of a vertical alignment layer, and may be formed of an alignment material such as polyamic acid, polysiloxane, or polyimide. The first and second alignment layers 11 and 21 may be connected to each other at the edge of the pixel area PX.

A liquid crystal layer made of liquid crystal molecules 31 is positioned in the microcavity 105 positioned between the pixel electrode 191 and the common electrode 270 . The liquid crystal molecules 31 have negative dielectric anisotropy, and may stand in a direction perpendicular to the insulating substrate 110 in a state where no electric field is applied. That is, vertical alignment may be achieved.

The first sub-pixel electrode 191h and the second sub-pixel electrode 1911l to which the data voltage is applied generate an electric field together with the common electrode 270 to be positioned in the microcavity 105 between the two electrodes 191 and 270 . The direction of the liquid crystal molecules 31 is determined. The luminance of light passing through the liquid crystal layer varies according to the determined direction of the liquid crystal molecules 31 .

A roof layer 106 is positioned on the common electrode 270 . The roof layer 106 may be made of an organic material. A microcavity 105 is formed under the roof layer 106 , and the roof layer 106 may be hardened by a curing process to maintain the shape of the microcavity 105 . That is, the roof layer 106 is formed to be spaced apart from the pixel electrode 191 with the microcavity 105 interposed therebetween.

The roof layer 106 is formed in each pixel area PX and the second valley V2 along the pixel row, but is not formed in the first valley V1 . That is, the roof layer 106 is not formed between the first subpixel area PXa and the second subpixel area PXb. In each of the first sub-pixel area PXa and the second sub-pixel area PXb , the microcavity 105 is formed under each roof layer 106 . In the second valley V2 , the microcavity 105 is not formed under the roof layer 106 , but is formed to be attached to the substrate 110 . Accordingly, the thickness of the roof layer 106 positioned in the second valley V2 is thicker than the thickness of the roof layer 106 positioned in each of the first sub-pixel area PXa and the second sub-pixel area PXb. can be The upper surface and both sides of the microcavity 105 are covered by the roof layer 106 .

An inlet 307 exposing a portion of the microcavity 105 is formed in the common electrode 270 and the roof layer 106 . The inlet 307 may be formed at edges of the first subpixel area PXa and the second subpixel area PXb to face each other. That is, the inlet 307 may be formed to expose a side surface of the microcavity 105 corresponding to the lower side of the first subpixel area PXa and the upper side of the second subpixel area PXb. Since the microcavity 105 is exposed by the inlet 307 , an aligning agent or a liquid crystal material may be injected into the microcavity 105 through the inlet 307 .

A covering layer 108 may be positioned over the roof layer 106 .

The capping layer 108 is positioned to cover the inlet 307 exposing a part of the microcavity 105 to the outside. That is, the capping layer 108 may seal the microcavity 105 so that the liquid crystal molecules 31 formed inside the microcavity 105 do not come out. Since the capping layer 108 comes into contact with the liquid crystal molecules 31 , it is made of a material that does not react with the liquid crystal molecules 31 .

The capping layer 108 may be formed of a multilayer such as a double layer, a triple layer, or the like. The bilayer consists of two layers of different materials. The triple film consists of three layers, and the materials of the adjacent layers are different from each other. For example, the capping layer 108 may include a layer made of an organic insulating material and a layer made of an inorganic insulating material.

As described above, the display device according to another exemplary embodiment of the present invention can provide a display device with excellent display quality due to improved light output rate and improved color reproducibility, and also simplifies the manufacturing process and structure by using a single substrate. can do.

Hereinafter, color reproducibility of a display device according to an exemplary embodiment will be described with reference to FIGS. 14 to 15 . 14 to 15 are color coordinate images for Examples and Comparative Examples of the present invention.

First, as a comparative example, FIG. 14 is a color coordinate image for a case in which a blue diode light source is transmitted through a red color conversion media layer. Looking at this, it can be confirmed that blue light (wavelength 400 nm range) is transmitted through the central portion of the red color conversion media layer, and thus blue is visually recognized. That is, in the comparative example, blue light is mixed and the color reproducibility is lowered.

Next, FIG. 15 is a color coordinate image of a case in which a blue diode light source is transmitted through a red color conversion media layer as an embodiment according to the present invention. Looking at this, it can be seen that blue is hardly recognized even in the central portion of the red color conversion media layer (wavelength of the latter half of 600 nm). It can be seen that the color gamut is also improved through the color coordinate image.

See Table 1 below in more detail.

division scattering layer light emission rate rate of increase Comparative example (no scattering layer) - 11% - Example (with scattering layer) 10 vol% 18% 166% 20 vol% 19% 167%

Comparative Example did not include a scattering layer, and thus the light output rate was about 11%. On the other hand, the light emission rate of the color conversion media layer including the scattering layer according to the embodiment of the present invention was 18% and 19%, respectively. That is, it can be seen that the light output rate is improved compared to the comparative example in which the scattering layer is not included. In addition, as a result of confirming the increase rate compared to the comparative example, it was confirmed that the light output rate was improved by about 66% and 67%, respectively. Accordingly, it was confirmed that the display device according to the exemplary embodiment of the present invention can provide a display device having excellent display quality by improving light output rate and color reproducibility.

Although the preferred embodiment of the present invention has been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also provided. is within the scope of the

10: display panel 12, 22: polarizing plate
30: color conversion panel 310: substrate
330: color conversion media layer 340: scattering layer

Claims (18)

display panel, and
A color conversion panel positioned on the display panel,
The color conversion panel,
a color conversion media layer, and
a scattering body and a scattering layer comprising at least one of a pigment and a dye adsorbed to the scattering body;
At least one of the pigment and the dye is adsorbed to cover a portion of a surface of the scatterer. In claim 1,
The color conversion media layer includes at least one of a phosphor and a quantum dot. In claim 2,
The color conversion media layer includes a photosensitive resin,
At least one of the phosphor and the quantum dots is dispersed in the photosensitive resin. In claim 1,
The scatterer includes at least one _{of TiO 2} , ZrO ₂ , Al ₂ O ₃ , In ₂ O ₃ , ZnO, SnO ₂ , Sb ₂ O _{3 , and ITO.} In claim 1,
a density of the scattering layer is greater than a density of the color conversion media layer. In claim 1,
The scattering layer has a refractive index of 1.5 or more. In claim 2,
The color conversion media layer includes a red color conversion media layer, a green color conversion media layer, and a transparent layer. In claim 7,
The display device further comprising a light blocking member positioned between the adjacent red color conversion media layer, the green color conversion media layer, and the transparent layer. In claim 8,
The transparent layer does not include the phosphor and the quantum dots. In claim 7,
The scattering layer disposed on the transparent layer does not include the dye and the pigment. In claim 1,
The dye and the pigment absorb blue light. In claim 1,
The display device further comprising a light emitting diode for supplying light to the color conversion panel. delete In claim 12,
The light emitting diode is a display device that emits a specific wavelength band, such as ultraviolet light or blue light.
delete delete delete delete

Images