KR102227019B1 - Display device - Google Patents

Abstract

The display device includes a display panel, a backlight unit, and a color conversion layer. The color conversion layer includes light-emitting particles and metal particles. The light-emitting particles receive the first light and generate second light having a wavelength different from that of the first light. The metal particles induce surface plasmon resonance by receiving at least one of the first light and the second light.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device including a color conversion layer.

Recently used display devices include a liquid crystal display device, an electrowetting display device, and an electrophoretic display device. The display devices include light-receiving display panels and a separate backlight unit that provides light to the display panels. In general, the backlight unit provides white light to the display panels, and the white light is converted into light having a specific color and is visually recognized by the user's eyes.

However, conventional display devices have low light emission efficiency, light leakage and color mixing, and measures to prevent this are being sought.

An object of the present invention is to provide a display device capable of improving light emission efficiency and preventing light leakage and color mixing.

A display device according to an exemplary embodiment of the present invention includes a display panel, a backlight unit, and a color conversion layer. The backlight unit provides first light to the display panel. The color conversion layer is formed on the display panel and includes light-emitting particles and metal particles. The light-emitting particles receive the first light and generate second light having a wavelength different from that of the first light. The metal particles induce surface plasmon resonance by receiving at least one of the first light and the second light.

The light emitting particles and the metal particles may be dispersed in the color conversion layer.

The color conversion layer may include a light emitting particle layer including the light emitting particles and a metal particle layer including the metal particles.

The metal particle layer may be plural.

The metal particles may include first metal particles and second metal particles composed of a metal different from the first metal particles.

The color conversion layer may include a light-emitting particle layer including the light-emitting particles, a first metal particle layer including the first metal particles, and a second metal particle layer including the second metal particles.

The color conversion layer may include a first light-emitting metal layer in which the light-emitting particles and the first metal particles are dispersed, and a second metal particle layer including the second metal particles.

The color conversion layer may include a second light-emitting metal layer in which the light-emitting particles and the second metal particles are dispersed, and a first metal particle layer including the first metal particles.

The first light may be blue light.

The display panel includes a plurality of pixel areas, each of the pixel areas including a red pixel area, a green pixel area, and a blue pixel area, and the color conversion layer is a red color conversion layer overlapping the red pixel area and the A green color conversion layer overlapping the green pixel area may be included.

The display device according to an exemplary embodiment of the present invention may further include a scattering layer overlapping the blue pixel area. The scattering layer may include scattering bodies that scatter the first light.

The red color conversion layer includes red metal particles, the green color conversion layer includes green metal particles, and the average particle diameter of the red metal particles may be larger than the average particle diameter of the green metal particles. .

The average particle diameter of the scattering bodies may be smaller than the average particle diameter of the green metal particles.

The display device according to an embodiment of the present invention reflects at least a portion of the first light transmitted through the color conversion layer by being formed on the color conversion layer and the band pass filter formed between the color conversion layer and the display panel. It may further include a recycling layer to let.

The metal particles are at least one selected from the group consisting of gold, silver, aluminum, platinum, palladium, cadmium, cobalt, ruthenium, copper, indium, nickel, and iron, or an alloy containing at least one or more selected from the group It can be.

At least some of the metal particles may be coated with a dielectric layer.

The dielectric layer may include a first dielectric layer and a second dielectric layer coating the first dielectric layer.

The dielectric layer may include at least one selected from the group consisting of titanium oxide, silicon oxide, magnesium oxide, aluminum oxide, yttrium oxide, silicon nitride, and aluminum nitride.

The light-emitting particles may be phosphors or quantum dots.

According to the display device according to an exemplary embodiment of the present invention, light emission efficiency may be increased, and light leakage and color mixing may be prevented.

1 is an exploded perspective view schematically illustrating a display device according to an exemplary embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view corresponding to area A of FIG. 1.
3 is a cross-sectional view showing the shape of a cross section of a scattering body, a green metal particle, and a red metal particle.
4 to 10 are schematic cross-sectional views showing various forms of a color conversion layer according to an embodiment of the present invention.
11 shows metal particles and a dielectric layer according to an embodiment of the present invention.

The above objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments related to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

In describing each drawing, similar reference numerals have been used for similar elements. In the accompanying drawings, the dimensions of the structures are shown to be enlarged than actual for clarity of the present invention. Terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance the possibility of the presence or addition. Further, when a part such as a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where the other part is "directly above" but also the case where there is another part in the middle. Conversely, when a part such as a layer, film, region, plate, etc. is said to be "below" another part, this includes not only the case where the other part is "directly below", but also the case where there is another part in the middle.

Hereinafter, a display device according to an exemplary embodiment will be described.

1 is an exploded perspective view schematically illustrating a display device according to an exemplary embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view corresponding to area A of FIG. 1.

1 and 2, the display device 10 includes a display panel 100, a backlight unit 200, a color layer 300, a mold frame 400, and a top chassis 500.

The short axis direction of the display device 10 is defined as a first direction (for example, the DR1 direction of FIG. 1 ), and the major axis direction of the display device 1000 is the first direction (eg, DR1 of FIG. 1 ). Direction) and orthogonal to the second direction (for example, the DR2 direction of FIG. 1). In addition, the bottom chassis 250, the backlight unit 200, the mold frame 400, the display panel 100, and the top chassis 500 of the display device 10 are in the first and second directions (for example, For example, they are sequentially stacked in a third direction perpendicular to the DR1 direction of FIG. 1 and the DR2 direction (eg, the DR3 direction of FIG. 1).

As the display panel 301, a non-light-emitting type display panel that requires a separate backlight unit 200 may be used instead of a self-emission type display panel such as an organic light-emitting display panel. For example, various display panels such as a liquid crystal display panel (LCD) or an electrophoretic display panel (EDP) may be used. In this embodiment, the liquid crystal display panel will be described as an example.

The display panel 100 displays an image. The display panel 100 may include a display area that displays an image and a non-display area that does not display an image.

The display panel 100 is formed between a first substrate 102, a second substrate 104 facing and coupled to the first substrate 102, and between the first substrate 102 and the second substrate 104. It includes a liquid crystal layer (LC) interposed therebetween.

The display panel 100 includes a plurality of pixel areas PXL. The pixel regions PXL include at least one thin film transistor TFT and a pixel electrode PE for driving liquid crystal molecules.

The plurality of pixel regions PXL are defined by, for example, gate lines (not shown) and data lines (not shown). Each of the pixel regions PXL may include a red pixel region PXL_R, a green pixel region PXL_G, and a blue pixel region PXL_B. In the display device 10 according to the exemplary embodiment, the pixel regions PXL each include a red pixel region PXL_R, a green pixel region PXL_G, and a blue pixel region PXL_B. Although described, a white pixel area (not shown) may be further included.

The red pixel area PXL_R emits red light L_R and may overlap with the red color conversion layer 301_R, and the green pixel area PXL_G emits green light L_G, and the green color conversion layer ( 301_G) can be overlapped. The blue pixel region PXL_B may emit blue light L_B and may overlap the scattering layer 302.

The red color conversion layer 301_R includes red light emitting particles 310_R and red metal particles 320_R, and the green color conversion layer 301_G includes green light emitting particles 310_G and green metal particles They may include (320_G).

The scattering layer 302 overlaps the blue pixel region PXL_B. The scattering layer 302 includes scattering bodies 323. The scattering bodies 323 may scatter the first light L1. The scattering bodies 323 are not particularly limited as long as they are commonly used, but _{may be TiO 2} , metal, or the like. The scattering bodies 323 may be formed of the same metal as the metal particles 320.

The scattering layer 302 including the scattering bodies 323 may be filled with a scattering insulating material 331. In this case, the scattering insulating material 331 may be formed of the same material as the insulating material 330 filled in the color conversion layer 301. For example, the scattering insulating material 331 may be, for example, a silicone resin, an epoxy resin, or the like. However, the present invention is not limited thereto, and the scattering insulating material 331 may be formed of a material different from the insulating material 330. In addition, the scattering insulating material 331 may have light transmittance. Since the scattering insulating material 331 has transmittance, light emission efficiency may be increased.

In the display device 10 according to the exemplary embodiment, the scattering layer 302 overlapping the blue pixel region PXL_B has been described as an example, but the present invention is not limited thereto, and the blue color conversion layer (not shown) Si) may be formed in place of the scattering layer 302.

3 is a cross-sectional view showing the shape of a cross section of a scattering body, green metal particles, and red metal particles.

As the wavelength of light increases, the size of metal particles to sufficiently induce surface plasmon resonance tends to increase. That is, referring to FIG. 3, the average particle diameter (D_R) of the red metal particles 320_R is the average particle diameter (D_G) of the green metal particles 320_G and the average particle diameter (D_B) of the scattering bodies 323 Is larger, and the average particle diameter D_G of the green metal particles 320_G may be larger than the average particle diameter D_B of the scattering bodies 323. The average particle diameter D_R of the red metal particles 320_R may be the largest, and the average particle diameter D_B of the scattering bodies 323 may be the smallest.

Referring back to FIGS. 1 and 2, a black matrix BM may be formed between the red color conversion layer 301_R and the green color conversion layer 301_G. The black matrix BM may prevent light leakage of the red light L_R of the red color conversion layer 301_R and the green light L_G of the green color conversion layer 301_G, and mixing of colors with each other.

A black matrix BM may also be formed between the green color conversion layer 301_G and the scattering layer 302. The black matrix BM may prevent light leakage of the green light L_G of the green color conversion layer 301_G and the blue light L_B of the scattering layer 302 from being mixed with each other.

In FIG. 2, for example, a black matrix BM is formed between the red color conversion layer 301_R and the green color conversion layer 301_G, but the present invention is not limited thereto, and the black matrix BM is It may not be formed. That is, the red color conversion layer 301_R and the green color conversion layer 301_G may be formed adjacent to each other.

The first substrate 102 includes a first base substrate SUB1, a thin film transistor TFT, and a pixel electrode PE.

The first base substrate SUB1 may be a plastic substrate, a glass substrate, a quartz substrate, or the like. The first base substrate SUB1 may be a transparent insulating substrate.

A gate line (not shown) and a data line (not shown) may be formed on the first base substrate SUB1. There may be a plurality of gate lines (not shown), and the plurality of gate lines (not shown) are formed to extend in a first direction on the first base substrate SUB1. There may be a plurality of data lines (not shown), and each of the plurality of data lines (not shown) crosses the first direction with the gate line (not shown) and the gate insulating layer GI interposed therebetween. It is provided extending in the second direction.

The thin film transistor TFT includes a gate electrode GE, a semiconductor pattern SM, a source electrode SE, and a drain electrode DE.

The gate electrode GE is branched from the gate line (not shown) or provided on a partial region of the gate line (not shown). The gate electrode GE may be made of metal. The gate electrode GE may be formed of a plurality of layers. The gate electrode GE may be made of, for example, nickel, chromium, molybdenum, aluminum, titanium, copper, tungsten, and an alloy containing them.

A gate insulating layer GI is formed on the gate electrode GE. The gate insulating layer GI is provided on the entire surface of the first base substrate SUB1 and covers the gate line (not shown) electrode layer and the gate electrode GE.

The semiconductor pattern SM is provided on the gate insulating layer GI. The semiconductor pattern SM is provided on the gate electrode GE with the gate insulating layer GI interposed therebetween, and a partial region overlaps the gate electrode GE.

The source electrode SE is provided by being branched from the data line (not shown). A portion of the source electrode SE overlaps the gate electrode GE.

The drain electrode DE is provided to be spaced apart from the source electrode SE with the semiconductor pattern SM interposed therebetween. The drain electrode DE is provided so that a partial region overlaps the gate electrode GE.

The source electrode SE and the drain electrode DE may be formed of a plurality of layers. The source electrode SE and the drain electrode DE may be made of, for example, nickel, chromium, molybdenum, aluminum, titanium, copper, tungsten, and an alloy containing them.

The pixel electrode PE may be formed on the first insulating layer INL1. The first insulating layer INL1 may include a plurality of layers, and the plurality of layers may include an organic layer and or an inorganic layer.

The pixel electrode PE is connected to the drain electrode DE through a contact hole CH. The pixel electrode PE is formed of a transparent conductive material. In particular, the pixel electrode PE is formed of transparent conductive oxide. The transparent conductive oxide includes indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), and the like. The pixel electrode PE may be formed by various methods, and may be formed using, for example, a photolithography process.

The second substrate 104 includes a second base substrate SUB2, a black matrix BM, and a common electrode CE. However, the present invention is not limited thereto, and the black matrix BM and the common electrode CE may be included in the first substrate 102.

The second base substrate SUB2 may be a plastic substrate, a glass substrate, a quartz substrate, or the like. The second base substrate SUB2 may be a transparent insulating substrate.

The black matrix BM is formed to correspond to the light blocking area of the first substrate 102. The light blocking region may be defined as a region in which the data line DL, the thin film transistor TFT, and the gate line GL are formed. Since the pixel electrode PE is not typically formed in the light-blocking region, light leakage may occur because liquid crystal molecules are not aligned. Accordingly, the black matrix BM is formed in the light blocking area to block the light leakage. The black matrix (BM) may be formed by forming a light-blocking layer that absorbs light and patterning the light-blocking layer using photolithography, and may optionally be formed by another method, for example, an inkjet method. .

A planarization layer OC may be formed on the black matrix BM. The planarization layer OC may maintain a flat top surface of the second base substrate SUB2 on which the black matrix BM is disposed.

The common electrode CE may be formed on the planarization layer OC. The common electrode CE may be formed of a transparent conductive material. The common electrode CE may be formed of, for example, a conductive metal oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), or indium tin zinc oxide (ITZO). The common electrode CE may be formed by various methods, and may be formed using, for example, a photolithography process.

The liquid crystal layer LC includes a plurality of liquid crystal molecules having dielectric anisotropy. When an electric field is applied between the pixel electrode PE and the common electrode CE of the first substrate 102, the liquid crystal molecules of the liquid crystal layer LC are ) Rotates in a specific direction, and accordingly, the transmittance of light incident on the liquid crystal layer LC is adjusted.

The color conversion layer 301 is formed on the display panel 100 and may include light-emitting particles 310 and metal particles 320. This will be described in more detail later.

The display device 10 according to the exemplary embodiment may further include a third base substrate SUB3. The third base substrate SUB3 may be formed on the color conversion layer 301.

The third base substrate SUB3 may be a plastic substrate, a glass substrate, a quartz substrate, or the like, or a transparent insulating substrate.

The driving chip 108 for applying a data signal to the data line (not shown) may be provided on at least one side of the first substrate 102. The driving chip 108 generates a data signal to be applied to the data line (not shown) of the display panel 100 in response to an external signal. The external signal is a signal supplied from the printed circuit board 110, and the external signal may include an image signal, various control signals, driving voltage, and the like.

A gate driving circuit (not shown) for applying a gate signal to the gate line (not shown) may be formed on the other side of the first substrate 102 through a thin film process. Accordingly, the gate driving circuit (not shown) may be embedded in the display panel 100.

The display device 10 may further include a driving chip 108 providing a driving signal to the display panel 100 and a printed circuit board 110 electrically connected to the display panel 100.

The driving chip 108 may be composed of two or more chips separated into a data driving chip and a gate driving chip, and may be mounted on the first substrate 102 by a chip on glass process. have.

The printed circuit board 110 may be electrically connected to the display panel 100 by a plurality of tape carrier packages (TCPs) 109. The driving chip 108 may be mounted on the TCPs 109. The TCPs 109 may be bent to surround the side of the bottom chassis 250.

The printed circuit board 110 connected to the TCPs 109 may be disposed under the bottom chassis 250. In this case, the display device 10 may further include a shield case (not shown) disposed under the bottom chassis 250 to protect the printed circuit board 110.

The backlight unit 200 supplies first light L1 to the display panel 100. The first light L1 may have a wavelength within a wavelength range of visible light, and may be, for example, blue light.

The backlight unit 200 may include a light source unit 240 and a light guide plate 220. The light source unit 240 supplies light to the light guide plate 220. The light source unit 240 may include at least one light source 241 and a circuit board 242 that mounts the light source 241 on one surface and applies power to the light source 241.

The light guide plate 220 guides and emits light provided from the light source unit 240. The circuit board 242 may have a plate shape. The light source unit 240 may include a plurality of Light Emitting Diodes (LEDs). The plurality of light emitting diodes may be disposed on the circuit board 242 to be spaced apart from each other in the second direction (for example, the DR2 direction of FIG. 1 ).

The backlight unit 200 may further include an optical member 210 provided between the light guide plate 220 and the display panel 100 and a reflective sheet 230 disposed under the light guide plate 220. .

The optical member 210 improves the luminance and viewing angle of light emitted to the emission surface. The optical member 210 may include a first optical sheet 206, a second optical sheet 207, and a third optical sheet 208 sequentially stacked.

The first optical sheet 206 may be a diffusion sheet that diffuses light emitted from the light guide plate 210. The second optical sheet 207 may be a prism sheet for condensing light diffused from the diffusion sheet in a direction perpendicular to a plane of the upper display panel 100. The third optical sheet 208 may be a protective sheet that protects the prism sheet from external impact. As for the optical member 210, at least one of the first to third optical sheets 206, 207, and 208 may be stacked and used, and any one sheet may be omitted if necessary.

The reflective sheet 230 serves to reflect light leaked from the reflective surface and re-enter the light guide plate 220. The reflective sheet 230 includes a material that reflects light.

The mold frame 400 is interposed between the display panel 100 and the backlight unit 200 to support the display panel 100.

The backlight unit 200 includes a bottom chassis 250. The bottom chassis 250 accommodates the backlight unit 200.

The top chassis 500 is coupled to face the bottom chassis 250. The top chassis 500 may cover an edge of the display panel 100.

The display device 10 according to the exemplary embodiment may further include a band pass filter BF, a recycling layer RL, a first transparent layer TL1, and a second transparent layer TL2.

The band pass filter BF is formed between the color conversion layer 301 and the display panel 100. The band pass filter BF may selectively pass the first light L1. The band pass filter BF may include a red band pass filter BF_R overlapping the red pixel region PXL_R and a green band pass filter BF_G overlapping the green pixel region PXL_G. However, the present invention is not limited thereto, and the band pass filter BF may also overlap the blue pixel region PXL_B, and may be formed entirely on the display panel 100.

The recycling layer RL is formed on the color conversion layer 301 to reflect at least a portion of the first light L1 transmitted through the color conversion layer 301. The recycling layer RL reflects at least a portion of the first light L1 passing through the color conversion layer 301 to recycle the first light L1, and accordingly, the display device 10 ) Can increase the light emission efficiency.

The first transparent layer TL1 may be formed between the scattering layer 302 and the display panel 100. The first transparent layer TL1 may be formed on the same layer as the band pass filter BF. However, when a blue color conversion layer (not shown) is formed instead of the scattering layer 302, the recycling layer RL may be formed instead of the first transparent layer TL1.

The second transparent layer TL2 may be formed between the scattering layer 302 and the third base substrate SUB3. The second transparent layer TL2 may be formed on the same layer as the recycling layer RL. However, when a blue color conversion layer (not shown) is formed instead of the scattering layer 302, a band pass filter BF may be formed instead of the second transparent layer TL2.

As mentioned above, the color conversion layer 301 is formed on the display panel 100 and includes light-emitting particles 310 and metal particles 320. The color conversion layer 301 including the light-emitting particles 310 and metal particles 320 may be filled with an insulating material 330. The insulating material 330 may be, for example, a silicone resin, an epoxy resin, or the like. In addition, the insulating material 330 may have light transmittance. Since the insulating material 330 has transmittance, light emission efficiency may be increased.

The light-emitting particles 310 are included in the color conversion layer 300. The light-emitting particles 310 may be phosphors or quantum dots.

The light emitting particles 310 receive the first light L1 and generate second light L2 having a wavelength different from that of the first light L1. For example, the light-emitting particles 310 included in the red color conversion layer 301_R may be red phosphors 310_R, and the light-emitting particles 310 included in the green color conversion layer 301_G are It may be green phosphors 310_G.

The metal particles 320 are included in the color conversion layer 300. The metal particles 320 may scatter the first light L1, thereby reducing light leakage and color mixing.

The metal particles 320 receive at least one of the first light L1 and the second light L2 to induce surface plasmon resonance. The first light L1 may be blue light, and the second light L2 may be green light L_G, red light L_R, or the like.

More specifically, a phenomenon in which electrons collectively vibrate, a so-called surface plasmon, may be generated on the surface of the metal particles 320, and surface plasmon waves, a kind of electromagnetic waves, may be generated by the surface plasmon. plamon wave) can be generated. The surface plasmon wave is a type of electromagnetic wave, and unlike general electromagnetic waves traveling in a random direction in space, the surface plasmon wave may travel along the surfaces of the metal particles 320.

When at least one of the first light L1 and the second light L2 is incident on the metal particle, the light is defined as incident light, and the angle at which the incident light is incident on the metal particle, More specifically, when the angle between the normal and the incident light perpendicular to the surface of the metal particles 320 is defined as the incident angle, the phases of the incident light and the surface plasmon wave coincide with each other in response to a specific value of the incident angle. can do. At this time, the energy of the incident light is absorbed by the metal particles 320, and as a result, the electric field distribution in the direction perpendicular to the interface increases exponentially, while the inner side of the metal particles 320 As it goes to, a sharp decrease occurs. This phenomenon is referred to as so-called surface plasmon resonance, and when the surface plasmon resonance occurs, the angle of incidence is referred to as a surface plasmon resonance angle.

A localized field is generated on the surfaces of the metal particles 320 by the surface plasmon resonance, and thus, a resonance wave may be generated from the metal particles 320. When the resonance wave is generated from the metal particles 320, when the peak wavelength of the resonance wave is within the wavelength range of the second light L2, the second light L2 by the resonance wave This amplification phenomenon, a so-called resonant coupling of light, occurs.

By the optical resonance coupling, the intensity of the second light L2 may be improved, so that the light-emitting particles 310 have improved luminous efficiency by the optical resonance coupling, and thus the light-emitting particles 310 The intensity of the second light L2 generated from) may be increased. Accordingly, even if the intensity of the first light L1 is reduced, the second light L2 of sufficient intensity can be secured by the optical resonance coupling, thereby improving the light emission efficiency of the display device 10. have.

In addition, the display device 10 according to an embodiment of the present invention may secure the second light L2 of sufficient intensity through surface plasmon resonance of the metal particles 320, and thus, the display Even if the color conversion layer 301 is disposed on the panel 100, high light emission efficiency can be obtained.

The metal particles 320 are at least one selected from the group consisting of gold, silver, aluminum, platinum, palladium, cadmium, cobalt, ruthenium, copper, indium, nickel, and iron, or at least one selected from the group. It may be an alloy containing.

The metal particles 320 may have a spherical particle shape. However, the present invention is not limited thereto, and may have various shapes such as a rod, a tetrahedron, a hexahedron, and an octahedron other than a sphere.

4 to 10 are schematic cross-sectional views showing various forms of the color conversion layer 301 according to an embodiment of the present invention.

Referring to FIG. 4, the light-emitting particles 310 and the metal particles 320 may be dispersed in the color conversion layer 300. That is, the light-emitting particles 310 and the metal particles 320 may be randomly dispersed in the color conversion layer 300. The metal particles 320 may be spaced apart from the light-emitting particles 310 or may be disposed on the surface of the light-emitting particles 310.

Referring to FIG. 5, the color conversion layer 301 may include a light emitting particle layer PL and a metal particle layer ML. The light-emitting particle layer PL may include light-emitting particles 310. The metal particle layer ML may include metal particles 320. 5 illustrates that the light-emitting particle layer PL is formed on the metal particle layer ML, but the present invention is not limited thereto, and the metal particle layer ML may be formed on the light-emitting particle layer PL.

Referring to FIG. 6, there may be a plurality of metal particle layers ML. The plurality of metal particle layers ML may be formed to be spaced apart from each other as shown in FIG. 6. For example, the light emitting particle layer PL may be disposed between the plurality of metal particle layers ML. However, the present invention is not limited thereto, and the light emitting particle layer PL may be disposed on the plurality of metal particle layers ML, or the plurality of metal particle layers ML may be disposed on the light emitting particle layer PL. .

The metal particles 320 may include first metal particles 321 and second metal particles 322. The second metal particles 322 may be formed of a metal different from the first metal particles 321.

Referring to FIG. 7, the light-emitting particles 310, the first metal particles 321, and the second metal particles 322 may be dispersed in the color conversion layer 300. That is, the light-emitting particles 310, the first metal particles 321, and the second metal particles 322 may be randomly dispersed in the color conversion layer 300. That is, the first metal particles 321 and the second metal particles 322 may be spaced apart from the light-emitting particles 310 or may be disposed on the surface of the light-emitting particles 310.

Referring to FIG. 8, the color conversion layer 301 may include a light emitting particle layer PL, a first metal particle layer ML1, and a second metal particle layer ML2. The light-emitting particle layer PL may include light-emitting particles 310. The first metal particle layer ML1 may include first metal particles 321. The second metal particle layer ML2 may include second metal particles 322. In FIG. 8, it is shown that the light emitting particle layer PL is formed on the first metal particle layer ML1 and the second metal particle layer ML2 is formed on the light emitting particle layer PL. No, for example, the second metal particle layer ML2 may be formed on the first metal particle layer ML1, and the light-emitting particle layer PL may be formed on the second metal particle layer ML2. In addition, for example, the light emitting particle layer PL may be formed on the second metal particle layer ML2, and the first metal particle layer ML1 may be formed on the light emitting particle layer PL. In addition, the first metal particle layer ML1 and the second metal particle layer ML2 may be formed on the light emitting particle layer PL.

Referring to FIG. 9, the color conversion layer 301 may include a first light emitting metal layer PML1 and a second metal particle layer ML2. The first light-emitting metal layer PML1 may include the light-emitting particles 310 and the first metal particles 321. That is, the light-emitting particles 310 and the first metal particles 321 may be randomly dispersed in the first light-emitting metal layer PML1. The first metal particles 321 may be spaced apart from the light-emitting particles 310 or may be disposed on the surface of the light-emitting particles 310.

9 illustrates that the first light-emitting metal layer PML1 is formed on the second metal particle layer ML2, but is not limited thereto, and the first light-emitting metal layer ( PML1) may be formed.

Referring to FIG. 10, the color conversion layer 301 may include a second light-emitting metal layer PML2 and a first metal particle layer ML1. The second light-emitting metal layer PML2 may include the light-emitting particles 310 and the second metal particles 322. That is, the light emitting particles 310 and the second metal particles 322 may be randomly dispersed in the second metal particle layer ML2. The second metal particles 322 may be spaced apart from the light-emitting particles 310 or may be disposed on the surface of the light-emitting particles 310.

10 illustrates that the second light-emitting metal layer PML2 is formed on the first metal particle layer ML1, but is not limited thereto, and the second light-emitting metal layer ( PML2) may be formed.

11 illustrates metal particles 320 and a dielectric layer DL according to an embodiment of the present invention.

At least some of the metal particles 320 may be coated with a dielectric layer DL. For example, some of the metal particles 320 may be coated with the dielectric layer DL, and the rest of the metal particles 320 may not be coated with the dielectric layer DL.

The dielectric layer DL may change a range of a peak wavelength of the resonance wave of the metal particles 320. For example, as the thickness of the dielectric layer DL increases within the range of about 1 nm to about 500 nm, the wavelength of the resonance wave may increase by about several tens of nm.

The dielectric layer DL may include a first dielectric layer DL1 and a second dielectric layer DL2 coating the first dielectric layer DL1.

The dielectric layer DL may include an insulating material having light transmittance, and for example, the dielectric layer DL may include nitride or oxide. For example, the oxide may include at least one of titanium oxide, silicon oxide, magnesium oxide, aluminum oxide, and yttrium oxide, and the nitride may include at least one of silicon nitride and aluminum nitride. have.

The display device according to an exemplary embodiment of the present invention includes a color conversion layer including metal particles to scatter first light, thereby reducing light leakage and color mixing. In addition, the display device according to an embodiment of the present invention can secure the second light of sufficient intensity through surface plasmon resonance of the metal particles, and accordingly, by disposing the color conversion layer on the display panel, Also, high light emission efficiency can be obtained.

In the above, embodiments of the present invention have been described with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. You can understand that there is. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

10: display device 102: first substrate
104: second substrate 300: color layer
301: color conversion layer 302: scattering layer
310: light-emitting particles 320: metal particles

Claims (12)

A display panel providing first light in an upward direction; And
A color conversion layer formed on the display panel,
The color conversion layer
A red color conversion layer; And
Including a green color conversion layer,
Each of the red color conversion layer and the green color conversion layer
Light-emitting particles receiving the first light and generating second light having a wavelength different from that of the first light; And
Including metal particles that induce surface plasmon resonance by receiving at least one of the first light and the second light,
Each of the metal particles included in each of the red color conversion layer and the green color conversion layer includes first metal particles; And
A display device including second metal particles formed of a metal different from the first metal particles. The method of claim 1,
The light emitting particles and the metal particles are dispersed in the color conversion layer. The method of claim 1,
The color conversion layer
A light-emitting particle layer including the light-emitting particles; And
A display device comprising a metal particle layer including the metal particles. The method of claim 3,
The display device of the plurality of metal particle layers. The method of claim 1,
The color conversion layer
A light-emitting particle layer including the light-emitting particles;
A first metal particle layer including the first metal particles; And
A display device comprising a second metal particle layer including the second metal particles. The method of claim 1,
The color conversion layer
A first light-emitting metal layer in which the light-emitting particles and the first metal particles are dispersed; And
A display device comprising a second metal particle layer including the second metal particles. The method of claim 1,
The color conversion layer
A second light-emitting metal layer in which the light-emitting particles and the second metal particles are dispersed; And
A display device comprising a first metal particle layer including the first metal particles. The method of claim 1,
A band pass filter formed between the color conversion layer and the display panel; And
The display device further comprises a recycling layer formed on the color conversion layer and reflecting at least a portion of the first light transmitted through the color conversion layer. The method of claim 1,
The metal particles are at least one selected from the group consisting of gold, silver, aluminum, platinum, palladium, cadmium, cobalt, ruthenium, copper, indium, nickel, and iron, or an alloy containing at least one or more selected from the group A display device that is. The method of claim 1,
At least some of the metal particles are coated with a dielectric layer. The method of claim 10,
The dielectric layer is
A first dielectric layer; And
And a second dielectric layer coating the first dielectric layer. The method of claim 10,
The dielectric layer is
A display device comprising at least one selected from the group consisting of titanium oxide, silicon oxide, magnesium oxide, aluminum oxide, yttrium oxide, silicon nitride, and aluminum nitride.

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