WO2016144062A1 - 광학 부재 및 이를 구비하는 표시 장치 - Google Patents

광학 부재 및 이를 구비하는 표시 장치 Download PDF

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Publication number
WO2016144062A1
WO2016144062A1 PCT/KR2016/002222 KR2016002222W WO2016144062A1 WO 2016144062 A1 WO2016144062 A1 WO 2016144062A1 KR 2016002222 W KR2016002222 W KR 2016002222W WO 2016144062 A1 WO2016144062 A1 WO 2016144062A1
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WIPO (PCT)
Prior art keywords
scattering
region
layer
light
optical member
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PCT/KR2016/002222
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English (en)
French (fr)
Korean (ko)
Inventor
허영태
Original Assignee
주식회사 창강화학
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Priority to CN201680014807.8A priority Critical patent/CN107636853B/zh
Publication of WO2016144062A1 publication Critical patent/WO2016144062A1/ko

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/877—Arrangements for extracting light from the devices comprising scattering means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/12—Passive devices, e.g. 2 terminal devices
    • H01L2924/1204—Optical Diode
    • H01L2924/12044—OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Definitions

  • the present invention relates to an optical member and a display device having the same, and more particularly, to an optical member and a display device having the same, which can improve light extraction efficiency and improve color shift.
  • Such flat panel displays include a liquid crystal display, a plasma display panel, and an organic light emitting device.
  • the organic light emitting diode display has a wide viewing angle and a fast response speed, thereby enabling high quality display.
  • an organic light emitting display device having a microcavity structure may increase output efficiency by using a resonance effect of light between upper and lower electrodes, and may improve color purity of light.
  • the organic light emitting diode display includes a substrate, a transparent first electrode formed on the substrate, an organic layer formed on the first electrode, and a second electrode formed on the organic layer and having high reflectance.
  • the substrate uses a glass substrate or a plastic substrate.
  • the organic layer may include a hole injection layer, a hole transport layer, a light generating layer, a hole blocking layer, and an electron transport layer. That is, as a plurality of organic layers are stacked between the first electrode and the second electrode, an organic light emitting display device having a multilayer structure is manufactured.
  • the organic light emitting diode display has a problem in that light extraction efficiency is lowered due to light propagating in the lateral direction instead of the front due to internal reflection, and a color shift occurs depending on the viewing angle due to the device structure. have.
  • Patent Document 1 Korean Patent Publication No. 10-2009-0019752
  • the present invention provides an optical member and a display device having the same capable of improving light extraction efficiency.
  • the present invention provides an optical member capable of improving color shift and a display device having the same.
  • An optical member has a first surface, a second surface facing the first surface, and a material layer formed between the first surface and the second surface, wherein the material layer is light And a plurality of scattering regions for transmitting light and scattering light, wherein the plurality of scattering regions are spaced apart from each other in a plane direction and include a plurality of scattering particles therein.
  • the scattering region is formed in a direction crossing the first surface and the second surface, and is exposed from at least one of the first surface and the second surface.
  • the scattering region includes a base agent, and the scattering particles are dispersed in the base agent.
  • the content of the scattering particles relative to the total weight of the scattering region is characterized in that the range of 10 to 70% by weight.
  • the transmission region may include a first layer formed between the plurality of scattering regions and a second layer formed below the scattering region.
  • the scattering region is formed in a convex shape toward the second surface.
  • the scattering region is spaced apart from the second surface, and exposed to the first surface, wherein the scattering region includes only the scattering particles.
  • the spacing C between the scattering regions versus the width d of the scattering regions may be in a range of 1: 0.1 to 1: 1.
  • the width a from the end of one scattering region to the end of another scattering region adjacent to the height b of the scattering region is in the range of 1: 0.5 to 1: 5.
  • the height b of the scattering region is equal to or greater than the width d of the scattering region.
  • the sum of the volumes of the transmission zones is greater than the sum of the volumes of the scattering zones.
  • the refractive index of the transmission region is characterized in that it is equal to or smaller than the refractive index of the base agent.
  • the difference in refractive index between the scattering particles and the base is characterized in that the range of 0.01 to 0.7.
  • a display device includes a light emitting layer for generating light, a circular polarization layer formed on the light emitting layer, and a light transmitting layer and light scattering between the light emitting layer and the circular polarizing layer. And a material layer including a plurality of scattering particles therein and a plurality of scattering regions spaced apart from each other in a horizontal direction.
  • the circularly polarized layer may include a retardation film QWP and a polarizing film formed on the retardation film QWP.
  • the scattering region is formed in a direction crossing the material layer and is in contact with the circular light layer on at least one surface.
  • the transmission region may be formed between the plurality of scattering regions, and at least one surface thereof may contact the circular light layer.
  • the scattering region comprises a base agent, the scattering particles are dispersed in the base agent, the transmission region comprises a polymer resin, the refractive index of the polymer resin is less than or equal to the refractive index of the base agent It is done.
  • the spacing C between the scattering regions versus the width d of the scattering regions is in the range of 1: 0.1 to 1: 1.
  • the region width a from the end of one scattering region to the end of another scattering region adjacent to the height b of the scattering region is in the range of 1: 0.5 to 1: 5.
  • the height b of the scattering region is equal to or greater than the width d of the scattering region.
  • a material including a transmission region through which light passes and a plurality of scattering regions through which light is scattered, and the plurality of scattering regions are spaced apart from each other in a plane direction and include a plurality of scattering particles therein.
  • the layer is used as an optical member. That is, such an optical member is formed on the light emitting layer.
  • the total reflection is suppressed while suppressing the decrease of the front luminance of the display device, thereby improving the light extraction efficiency.
  • the embodiments of the present invention can easily manufacture the optical member as a member separate from the display device, and can be easily disposed at various positions of the display device according to a desired performance to improve the optical performance of the display device.
  • FIG. 1 is a cross-sectional view schematically illustrating a display device according to an exemplary embodiment of the present invention.
  • FIG. 2 is a cross-sectional view and a plan view showing an optical member according to an embodiment of the present invention
  • FIG 3 is a cross-sectional view conceptually illustrating a light emission path in a display device according to an exemplary embodiment of the present invention.
  • FIG. 4 is a perspective view schematically showing an optical member according to a modification of the present invention.
  • FIG. 5 is a cross-sectional view showing an optical member according to another modification of the present invention.
  • FIG. 1 is a cross-sectional view schematically illustrating a display device according to an exemplary embodiment of the present invention
  • FIG. 2 is a cross-sectional view and a plan view illustrating an optical member according to an exemplary embodiment of the present invention.
  • a display device receives an electrical signal and displays an image optically, and includes a light emitting layer 10 generating light and a circular polarization layer formed on the light emitting layer 10. 30) and disposed between the light emitting layer 10 and the circular polarization layer 30, the transmission region 22 through which the light is transmitted and the light is scattered and provided with a plurality of scattering particles therein and horizontally spaced apart from each other
  • the material layer 20 includes a plurality of scattering regions 21.
  • the light emitting layer 10 is made of an organic material and includes an organic light emitting layer (OLED) capable of self-emission.
  • the emission layer 10 includes an organic layer 11 that generates light, a first electrode 12 formed on one side of the organic layer 11, and a second electrode 13 formed on the other side of the organic layer 11. .
  • the first electrode 12 serves as a positive electrode (anode) and is formed of a transparent conductive oxide that can transmit light, and is indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO) and in It may be any one of 2 O 3 .
  • the second electrode 13 serves as a cathode and is formed of a metal material capable of reflecting light, and may be any one of LiF / Al, Ca / Al, Ca / Ag, Ag, Au, and Cu. have.
  • the first electrode 12, which is a transparent electrode through which light is transmitted, is positioned between the organic layer 11 and the pattern layer 20, and the second electrode 13 on which the light is reflected is formed on the other side of the organic layer 11. do.
  • the organic layer 11 includes a hole injection layer (HIL), a hole transport layer (HTL), an light emitting layer (EML), a hole blocking layer (HBL), and an electron An ETL (Electron Transport Layer) or the like.
  • HIL hole injection layer
  • HTL hole transport layer
  • EML light emitting layer
  • HBL hole blocking layer
  • ETL electron An ETL (Electron Transport Layer) or the like.
  • the hole injection layer HIL, the hole transport layer HTL, the light generating layer EML, the hole blocking layer HBL, and the electron transport layer are located in the direction in which the second electrode 13 is positioned from the first electrode 12. (ETL) may be stacked in order.
  • ETL Electrode Transport Layer
  • at least one of the hole injection layer HIL, the hole transport layer HTL, the hole blocking layer HBL, and the electron transport layer ETL may not be formed according to the structure and characteristics of the light emitting layer 10 to be manufactured, In addition, other layers may be formed.
  • the first electrode 12 for the positive electrode is formed of a light-transmissive material
  • the second electrode 13 for the negative electrode is formed of a material having a high reflectance, so that the light generated in the organic layer 11 is positive electrode (the first electrode).
  • the bottom emission type emitted in the direction of (12)) has been described.
  • the present invention is not limited thereto, and the light emitted from the organic layer 11 may be a top emission type in which the light is emitted in a direction in which the negative electrode (the second electrode 13) is positioned.
  • the light emitting layer 10 of the top emission type forms a first electrode 12 for the positive electrode using a material having a high reflectance, for example, a metal such as Ni, and forms a metal material in a thin thickness to allow light to pass therethrough. It is a structure which forms the 2nd electrode 13 for solvents.
  • the pattern layer and the circular polarization layer may be stacked in the lower direction of the second electrode 13 (the lower direction of the second electrode in FIG. 1).
  • the light emitted from the organic layer 11 may be a double emission type in which light is emitted to both sides of the positive electrode (the first electrode 12) and the negative electrode (the second electrode 13).
  • the light emitting layer 10 is formed such that both the first electrode 12 and the second electrode 13 have a light transmitting property, and an upper part of the first electrode 12 and a lower part of the second electrode 13.
  • a pattern layer and a polarizing film may be laminated on each.
  • the circular polarization layer 30 is a layer that prevents external light from being reflected back within the display panel and blocks external light reflection to improve luminance and color purity.
  • the circular polarization layer 30 may include a retardation film (QWP) 31 and a polarizing film (Pol) 32.
  • the retardation film (QWP) 31 is positioned between the material layer 20 and the polarizing film 32.
  • the retardation film 31 retards the circularly polarized light in one direction of the external incident light, thereby changing the circularly polarized light in the direction corresponding to the absorption axis of the polarizing film 32.
  • the retardation film 31 used is similar or identical to that used in a conventional display device, and thus a detailed description thereof will be omitted.
  • the polarizing film 32 is formed on the retardation film 31, and absorbs polarization in a specific direction, for example, Y-axis polarization, of light incident from the outside (hereinafter, external incident light), and polarization, for example, X-axis polarization, in the other direction. It functions to transmit about. In this case, external incident light that is not absorbed by the polarizing film 32 and is transmitted is scattered in the material layer 20 and then incident to the light emitting layer 10.
  • the polarizing film 32 may be formed using a material in which a polyvinyl alcohol (PVA) and an iodine-based dye are mixed.
  • PVA polyvinyl alcohol
  • a material in which a PVA and an iodine-based dye are mixed may be manufactured in a film form, and then the film may be formed on the retardation film 31.
  • the polarizing film 32 is not limited to the polarizing film formed of the above-described material, and various polarizing films used in a typical display device may be applied.
  • the material layer 20 is a type of optical member disposed between the light emitting layer 10 and the circular polarization layer 30 and used to improve optical performance of the display device.
  • an optical member according to an embodiment of the present invention includes a first surface 23, a second surface 24 and a first surface 23 and a second surface opposite to the first surface 23.
  • An optical member having a material layer 20 formed between the surfaces 24, the material layer 20 having a transmission region 22 through which light passes and a plurality of scattering regions 21 through which light is scattered.
  • the plurality of scattering regions 21 are spaced apart from each other in the plane direction and include a plurality of scattering particles 211 therein.
  • the optical member is a thin sheet or plate-shaped member having a first surface 23 and a second surface 24 facing each other and a side connecting them, which includes a layer of material 20 including regions having different characteristics. It is provided.
  • the material layer 20 is formed to have a predetermined thickness and includes a transmission region 22 through which light passes and a plurality of scattering regions 21 through which light is scattered. That is, the transmission region 22 and the scattering region 21 exist together in the same layer, and these regions are distinguished from each other.
  • the transmission region 22 and the scattering region 21 may be repeatedly formed alternately in the plane direction of the material layer 20, and the scattering regions 21 in the material layer 20 may be spaced at a predetermined interval. It may be arranged spaced apart from each other.
  • the scattering area 21 and the transmission area 22 may be regularly arranged or irregularly arranged.
  • the scattering region 21 is illustrated in a cylindrical shape in the drawing, the shape of the scattering region 21 is a region having a predetermined width and height, and its shape and size are not particularly limited.
  • the scattering region 21 includes a plurality of scattering particles 211 therein and scatters incident light, and is formed in a direction crossing the first surface 23 and the second surface 24. At least one of the first surface 23 and the second surface 24 may be exposed. That is, the scattering region 21 extends in the thickness direction of the material layer 20 and has an appropriately adjusted width.
  • the scattering area 21 may be exposed only on one side of the first side 23 and the second side 24, or may be exposed on both the first side 23 and the second side 24.
  • the scattering region 21 may be formed by penetrating the material layer 20 in the thickness direction thereof. In this case, when the optical member is used in the display device, as shown in FIG. 1, the scattering area 21 may contact another layer of the display device. For example, the scattering region 21 may contact the circular light layer 30 on at least one surface.
  • the scattering region 21 includes a base agent 212, and the scattering particles 211 are dispersed in the base agent 212.
  • the base 212 may be a material that maintains the shape of the scattering region 21, and may be manufactured using a polymer resin such as a thermosetting composition or a photocurable composition.
  • the base 212 can be made using an adhesive. When using the adhesive, it is possible to improve the bonding strength with the layers laminated on the upper and lower parts.
  • the thermosetting composition may include a thermosetting resin and a curing agent, and at least one of an acrylic resin, a silicone resin, or an epoxy resin may be used as the thermosetting resin, and as the curing agent, an isocyanate compound, an amine compound, an organic acid anhydride compound, An amide compound, a dialdehyde type compound, an adiridine type compound, a metal chelate compound, a metal alkoxide compound, a metal salt, etc. can be used.
  • the photocurable composition may comprise a photocurable compound and a photo-initiator, the photocurable compound may be a polymer or oligomer, a monomer, and the photocurable compound may be used in combination of two or more of the polymer, oligomer and monomer. It may be.
  • a polymer or an oligomer an acryl type compound, a silicone type compound, an epoxy type compound, etc. can be used, These can be used individually or in combination of 2 or more, respectively.
  • the scattering particles 211 use particles having a refractive index different from that of the base agent 212. That is, the scattering particles 211 may use a material having a larger refractive index than the base agent 212 or a material having a smaller refractive index than the base agent 212.
  • the refractive index of the scattering particles 211 may range from 1.5 to 2.7, and the difference in refractive index from the base agent 212 may range from 0.01 to 0.7. At this time, if the difference in refractive index is less than 0.01, it is difficult for the incident light to recognize the scattering particles, so that there is little scattering effect. If the difference in refractive index exceeds 0.7, the haze is severely changed, resulting in a decrease in luminance and a decrease in mass production efficiency.
  • the scattering particles 211 may be made of at least one of ZrO 2 , TiO 2 , Al 2 O 3 , MgO, and SiO 2 , and the particles may have a spherical shape or various polygonal shapes.
  • the size of the scattering particles 211 may range from 0.1 to 2 ⁇ m. In this case, the size means the average diameter of the particles.
  • the scattering particles 211 having the above range size are used, scattering particles having a size similar to that of the visible light band are used, and thus, the scattering particles can be maximized to maximize forward scattering and thus light scattering at a specific wavelength. As a result, the color shift phenomenon may be reduced, which causes color to be distorted according to an angle at which the display device is viewed.
  • the filling rate of the scattering particles 211 that is, the content of the scattering particles 211 with respect to the total weight of the scattering region 21 may be in the range of 10 to 70% by weight.
  • content is less than 10 weight%, the effect of improving a color shift is insignificant, and when content is more than 70 weight%, brightness falls.
  • the transmission region 22 is a region through which incident light is transmitted, and refers to all regions except the scattering region 21 in the material layer 20. That is, the transmissive region 22 may form a region of most of the first surface 23 and the second surface 24, and may form a surface to which other layers of the display device may contact each other. For example, the transmission region 22 may be formed between the plurality of scattering regions, and at least one surface thereof may contact the circular polarization layer 22.
  • the ratio of the transparent region 22 to the entire material layer 20 may be higher than that of the scattering region 21. For example, the sum of the volumes of the transmissive regions 22 may be greater than the sum of the volumes of the scattering regions 21. From this, the ratio of the light transmitted through the optical member can be increased.
  • the transmission region 22 may include a first layer 221 formed between the plurality of scattering regions 21 and a second layer 222 formed below the scattering region 21.
  • the second layer 222 may not be formed, in which case the lower surface of the first layer 221 is exposed.
  • the second layer 222 may improve adhesion to other layers of the display device in contact with the lower portion, and facilitate the manufacturing process of the optical member.
  • the transmission region 22 may include a polymer resin, and the polymer resin may include a material that is the same as or different from that of the base agent 212. That is, the polymer resin may be used by selecting from the materials of the base agent 212 described above, may be prepared by selecting the same material as the base agent 212 in the same material layer 20, or select a different material It may be prepared by.
  • the refractive index of the transmission region 22 may be less than or equal to the refractive index of the base agent 212.
  • optical member can be manufactured using various conventionally known manufacturing methods, the detailed description of the manufacturing process is omitted.
  • the total reflection can be removed and the color shift can be slightly improved, but the brightness of the angle that does not cause the total reflection is also scattered, thereby decreasing the front luminance.
  • the screen (black visibility) that should look black when it is turned off is bright.
  • the plurality of scattering regions in which scattering particles are dispersed and a transmission region located between the scattering regions are provided with an optical member formed on the same layer, and positioned below the phase difference film, the front luminance decreases. It can be suppressed and the color shift can be improved efficiently and the black visibility can be improved significantly.
  • the spacing C between the scattering regions 21 versus the width d of the scattering region 21 in the optical member may range from 1: 0.1 to 1: 1. As the ratio of the gap between them with respect to the width of the scattering region 21 increases, the ratio of the transparent region 22 increases, so that the light emitted without scattering increases and the center luminance increases. At this time, when the spacing C between the scattering regions 21 versus the width d of the scattering region 21 is smaller than 1: 0.1, the size of the scattering region 21 is very small, and thus the scattering region 21 and It is very difficult to manufacture the transparent region 22 accurately and stably, and the mass productivity is lowered. When the spacing C between the scattering regions 21 and the width d of the scattering region 21 are excessively larger than 1: 1, the size of the scattering region 21 increases so much that it exits without scattering. The light is reduced and the center luminance is lowered.
  • the width a) from the end of one scattering region to the end of another scattering region adjacent to the height b of the scattering region may range from 1: 0.5 to 1: 5. That is, the aspect ratio a: b of one optical region may be in the above range.
  • the height b of the scattering region 21 may be equal to or greater than the width d of the scattering region 21. As the height b of the scattering region 21 increases in the aspect ratio, scattering of light emitted at a large angle increases, and the degree of improvement in color shift depending on the viewing angle increases.
  • the aspect ratio is smaller than 1: 0.5
  • the height b of the scattering region 21 becomes too low, so that scattering of light emitted at a large angle is reduced, thereby improving the color shift according to the viewing angle.
  • the aspect ratio is too large exceeding 1: 5
  • the height b of the scattering region 21 becomes too high, making it difficult to stably form the scattering region 21 and the transmissive region 22, Degrades.
  • the height b of the scattering region 21 in the optical member may be 100 ⁇ m or less, and the height e of the second layer 222 of the transmission region 22 may be 0.1 to 5 ⁇ m. If the height b of the scattering region 21 is too high, it is difficult to stably form the scattering region 21. In addition, if the height e of the second layer 222 is too low, less than 0.1 ⁇ m, difficulties may occur in the manufacturing process. If the height e of the second layer is too large, exceeding 5 ⁇ m, light transmission This is because the degree can be reduced.
  • FIG. 3 is a cross-sectional view conceptually illustrating a light emission path in a display device according to an exemplary embodiment of the present invention.
  • an optical member including a scattering area 21 and a transmission area 21 is disposed on the same layer between the light emitting layer 10 and the retardation film 31. From this, by transmitting and scattering the light generated from the light emitting layer 10, while reducing the front brightness reduction, the light extraction efficiency is improved, and the color shift phenomenon is improved.
  • Light generated from the light emitting layer 10 passes through the transmission region 22 and the scattering region 21, and the light passing through the scattering region 21 is scattered by striking the scattering particles 211 that are dispersed. That is, straight light of the light incident on the optical member exits through the transmission region 22 as it is, and the light incident at an oblique angle is scattered by the scattering particles 211 positioned in the scattering region 21 and variously It is bent toward the light while being scattered by the dog's light. In this way, since the direct light is passed as it is, the inclined light is scattered into a plurality of light by the scattering particles 211 toward the front, thereby improving the light extraction efficiency, while minimizing the front brightness reduction, and improves the color shift phenomenon. It can be improved.
  • FIG. 4 is a perspective view schematically showing an optical member according to a modification of the present invention
  • FIG. 5 is a cross-sectional view showing an optical member according to another modification of the present invention. The same parts as in the above embodiment will be omitted.
  • the optical member according to the modified example changes the shape of the scattering region 21 formed in the material layer 20. That is, the scattering region 21 is spaced apart from the second surface 24, exposed to the first surface 23, and a portion located in the material layer 20 forms a curved surface.
  • the curved surface of the scattering region 21 may be formed in a convex shape toward the second surface 24.
  • the scattering region 21 includes a base agent 212 forming a curved surface and scattering particles 211 dispersed therein.
  • the degree of freedom of the positions where the patterns are disposed may be high, thereby facilitating the appearance problem such as moiré.
  • the optical member according to another modified example changes the structure of the scattering region 21 formed in the material layer 20.
  • the scattering region 21 includes a base agent and scattering particles, but this modification includes only scattering particles. That is, the scattering region is spaced apart from the second surface 24 and exposed toward the first surface 23, and the scattering region 21 includes only the scattering particles 211.
  • the material layer 20 includes a transmissive sheet 22 that serves as a transmissive region through which light is transmitted, and the concave groove 213 recessed inward from the first surface is formed in the transmissive sheet 22.
  • the scattering region 21 is formed by filling the plurality of scattering particles 211 in the space of the concave groove 213.
  • the height h of the scattering region 21 may be 0.8 to 1.2 times the average diameter of the scattering particles 211. From this, the scattering particles 211 located in the concave groove 213 may be formed in a substantially single layer.
  • the structure and shape of the scattering area and the transmission area may be variously changed.
  • the optical member of the test example was prepared by patterning a sheet of polymer resin to form a recess, and filling the recess with a base agent in which scattering particles were dispersed.
  • a polymer resin having a refractive index of approximately 1.5 was applied onto a base material, and a recess was formed in the polymer resin and cured using a mold having an uneven portion formed thereon. That is, the permeation region is formed of the polymer resin, and the scattering region is formed in the recess.
  • the width c of the transmission region is 3 ⁇ m
  • the width d of the recessed portion is 2.5 ⁇ m
  • the height b of the recessed portion is 3.2 ⁇ m
  • the height of the polymer resin under the recessed portion that is, the height e of the second layer.
  • the polymer resin and spherical alumina (Al 2 O 3) scattering particles having a refractive index of 1.77 were mixed at a weight ratio of 50:50. Thereafter, the mixture was filled in the concave portion of the cured polymer resin using a squeezing method, and then UV cured to complete the optical member. That is, a sheet-like optical member having a transmission region formed of a polymer resin and a scattering region in which scattering particles are dispersed is manufactured. At this time, the width (d) of 2.5 m of the recessed portion becomes the width of the scattering region, and the height b of 3.2 the recessed portion becomes the height of the scattering region.
  • the optical member is not used or a sheet in which scattering particles are dispersed as a whole is used as the optical member. That is, the conventional example 1 is a case where an optical member is not used, and the conventional example 2 used the sheet
  • spherical alumina (Al 2 O 3) scattering particles and ethyl acetate were mixed in a polymer resin having a refractive index of approximately 1.5 at a ratio of 66: 0.9: 33.1, respectively. After stirring at room temperature for about 1 hour to prepare a particle dispersion.
  • Each optical member manufactured as mentioned above was arrange
  • a commercially available organic light emitting panel (OLED panel) was used as a light source, and a circular polarizing film commercialized as a circular polarization layer was used, and the optical members of each of the above examples were installed thereon, and EZ contrast (Contrast) was used.
  • luminance and color coordinates according to the viewing angle were measured using the equipment (Eldim, France), and the pixel image was measured using the K-9500 (Kiens, Japan) equipment.
  • the circularly polarized layer was laminated on the upper portion (surface from which light is emitted) of the light source (OLED panel) in order to observe the optical performance when no other optical member was provided (prior example 1).
  • the EZ contrast device was used to measure the luminance and color coordinates according to the viewing angle.
  • the optical member of the conventional example 2 was laminated on the circular polarization layer, and the luminance according to the viewing angle using the EZ contrast equipment. And color coordinates.
  • the optical member of the test example was disposed between the light source and the circularly polarized layer in the same manner as described above, and the luminance and color coordinates according to the viewing angle were measured using an EZ contrast device.
  • FIG. 7 is a color coordinate graph according to a viewing angle of a test example of the present invention.
  • the characteristic table of FIG. 6 shows the luminance and color coordinate results of each of the above examples, and the luminance refers to an average value of luminance values measured at nine points among regions of an upper portion of the optical member disposed on the display device.
  • the color coordinates (u ', v') are converted to CIE 1976 UCS (u ', v') values based on the measured CIE 1931 (x, y) values and then normalized to 0 degrees. ) To compare.
  • the test example can be seen that the brightness is increased compared to the conventional examples 1 and 2. That is, it can be seen that the test example increases the luminance by about 105.8% compared with the conventional example 2 using the scattering particles.
  • the color shift phenomenon is improved as compared with the conventional example 1. That is, in the case of the display device that does not use the optical member of the conventional example 1, it can be seen that the color shift phenomenon is severe as the viewing angle increases. In particular, it can be seen that the color change occurs sharply above 60 degrees.
  • the optical member of the embodiment of the present invention when applied to the test example, that is, the lower portion of the retardation film of the display device, even if the viewing angle is increased, the color change is shown to be smooth, and the color shift phenomenon is improved from this.
  • organic light emitting diode display has been described as an example, the present invention is not limited thereto.
  • the organic light emitting diode display may be applied to various light emitting devices or display devices that are intended to improve light extraction efficiency and color shift.

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PCT/KR2016/002222 2015-03-10 2016-03-07 광학 부재 및 이를 구비하는 표시 장치 WO2016144062A1 (ko)

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CN109411621A (zh) * 2018-09-29 2019-03-01 云谷（固安）科技有限公司 显示面板及显示装置
US10826010B1 (en) 2019-06-20 2020-11-03 Sharp Kabushiki Kaisha High-efficiency QLED structures
US10930888B2 (en) 2019-07-22 2021-02-23 Sharp Kabushiki Kaisha High-efficiency QLED structures
US11316135B2 (en) 2019-07-22 2022-04-26 Sharp Kabushiki Kaisha High-efficiency QLED structures

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CN111584549B (zh) * 2020-04-29 2022-11-15 合肥维信诺科技有限公司 显示面板、显示面板的制备方法及显示装置
CN111864105A (zh) * 2020-07-09 2020-10-30 武汉华星光电半导体显示技术有限公司 显示面板及其制备方法

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US10826010B1 (en) 2019-06-20 2020-11-03 Sharp Kabushiki Kaisha High-efficiency QLED structures
US10930888B2 (en) 2019-07-22 2021-02-23 Sharp Kabushiki Kaisha High-efficiency QLED structures
US11316135B2 (en) 2019-07-22 2022-04-26 Sharp Kabushiki Kaisha High-efficiency QLED structures

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KR20160110630A (ko) 2016-09-22
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KR101768149B1 (ko) 2017-08-17

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