KR20180004375A - Organic light-emitting display apparatus and method for manufacturing thereof - Google Patents

Abstract

An organic light emitting display device and a manufacturing method thereof are disclosed. The organic light emitting display device includes a substrate, a display unit arranged on the substrate, an encapsulation substrate arranged on the display unit, a sealing member formed on the outer side of the display unit, a filler filled between the substrate and the encapsulation substrate, and light scattering particles dispersed in the filler. Accordingly, the present invention can obtain a color shift according to a reduced viewing angle as well as improved reliability.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light-emitting display device and a method of manufacturing the same,

Embodiments of the present invention relate to an organic light emitting display device and a method of manufacturing the same.

The organic light emitting display includes an organic light emitting device including an anode, a cathode, and an organic light emitting layer interposed therebetween. Emitting display device in which excitons generated by the combination of electrons and holes in the organic light emitting layer fall from an excited state to a ground state to generate light.

Since an organic light emitting display device does not require a separate light source, it can be driven at a low voltage and its thickness and / or weight can be reduced. Further, since the organic light emitting display device has excellent characteristics such as a viewing angle, a contrast, and a response speed, the range of application from a personal portable device such as an MP3 player or a cellular phone to a television (TV) is expanding.

Embodiments of the present invention provide an organic light emitting display device having a color shift according to a reduced viewing angle, improved process economics, and improved reliability, and a method of manufacturing the same.

One embodiment of the present invention provides a semiconductor device comprising: a substrate; A display unit disposed on the substrate; An encapsulation substrate opposed to the substrate and disposed on the display; A sealing member formed on an outer periphery of the display unit to bond the substrate and the sealing substrate; A filler filled between the substrate and the encapsulation substrate, inside the encapsulation member; And light scattering particles dispersed inside the filler, wherein the light scattering particles include a core and a shell, and the refractive index of the filler is different from the refractive index of the light scattering particles.

In the present embodiment, the difference between the refractive index of the filler and the refractive index of the light scattering particles may be more than 0 and less than 0.20.

In the present embodiment, the difference between the refractive index of the filler and the refractive index of the light scattering particles may be 0.10 to 0.15.

In the present embodiment, the refractive index of the filler may be 1.41 or more and 1.54 or less.

In this embodiment, the filler may comprise a polymer having siloxane repeat units.

In this embodiment, the refractive index of the light scattering particles may be more than 1.41 and not more than 1.60.

In this embodiment, the refractive index of the core may be 1.57 to 1.60.

In this embodiment, the refractive index of the shell may be 1.48 to 1.52.

In the present embodiment, the core and the shell may independently include at least one selected from a styrene-based polymer and an acrylate-based polymer.

In the present embodiment, the core may include at least one selected from a styrene homopolymer and a styrene-based copolymer.

In the present embodiment, the shell may include at least one selected from an acrylate polymer and an acrylate-based copolymer.

In the present embodiment, the core includes polystyrene, and the shell may include at least one selected from polymethacrylate and poly (methyl methacrylate).

In the present embodiment, the content of the light scattering particles in the filler may be 0.01 wt% to 50 wt%.

In the present embodiment, the content of the light scattering particles in the filler may be 1 wt% to 15 wt%.

In the present embodiment, it may further comprise a getter disposed inside the sealing member.

In this embodiment, it may further include a spacer located in the filler.

In one embodiment of the present invention, the display unit includes an organic light emitting diode, and the organic light emitting diode includes: a first electrode disposed on the substrate; A second electrode facing the first electrode; And an intermediate layer including a light emitting layer interposed between the first electrode and the second electrode.

In the present embodiment, a plurality of color filters interposed between the substrate and the encapsulation substrate may be further included, and the plurality of color filters may be disposed in a region corresponding to the intermediate layer.

In this embodiment, a black matrix interposed between the respective color filters may be further included.

Another embodiment of the present invention provides a method of manufacturing a display device, comprising: forming a display portion on one side of a substrate;

Forming a sealing member on an outer periphery of the display unit on the substrate;

Filling the filler and light scattering particles inside the sealing member on the substrate; And bonding the base and the sealing substrate via the sealing member, wherein the light scattering particles include a core and a shell, and the refractive index of the filling material is different from the refractive index of the light scattering particles. A manufacturing method is disclosed.

Other aspects, features, and advantages will become apparent from the following drawings, claims, and detailed description of the invention.

The organic light emitting display according to embodiments of the present invention may have color deviation according to a reduced viewing angle, improved process economics, and improved reliability.

1 is a cross-sectional view schematically showing a cross-section of an organic light emitting display device according to an embodiment of the present invention.
2 is a cross-sectional view schematically illustrating a display unit of an OLED display device according to an embodiment of the present invention.
3 is a schematic partial cross-sectional view illustrating an organic light emitting display device according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below, but may be implemented in various forms.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning.

In the following examples, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

In the following embodiments, terms such as inclusive or possessive are intended to mean that a feature, or element, described in the specification is present, and does not preclude the possibility that one or more other features or elements may be added.

In the following embodiments, when a part of a film, an area, a component or the like is on or on another part, not only the case where the part is directly on the other part but also another film, area, And the like.

In the drawings, components may be exaggerated or reduced in size for convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

If certain embodiments are otherwise feasible, the particular process sequence may be performed differently from the sequence described. For example, two processes that are described in succession may be performed substantially concurrently, and may be performed in the reverse order of the order described.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

FIG. 1 is a partial cross-sectional view schematically showing a cross-section of an organic light emitting display device according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view schematically illustrating a display portion of an OLED display device according to an embodiment of the present invention.

1 and 2, an OLED display 100 according to an exemplary embodiment of the present invention includes a substrate 110, a display unit 120, a sealing substrate 130, a filler 140, Particles 150 and a sealing member 160. [0033]

The substrate 110 may be a substrate used in a conventional organic light emitting display device, and may be formed of an insulating material and / or a flexible material. For example, the substrate 110 may be a glass substrate or a transparent plastic substrate having excellent mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, and waterproofness.

Examples of the material for forming the substrate 110 include polyether sulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethyelenene napthalate (PEN) But are not limited to, polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), cellulose triacetate (TAC), cellulose acetate propionate Cellulose acetate propionate (CAP), and the like.

For example, when the display unit is a bottom emission type in which light is emitted toward the substrate 110, the substrate 110 may be transparent.

On the other hand, when the display unit is a top emission type in which light is emitted toward the sealing substrate 130, the substrate 110 does not necessarily have to be transparent, and may be opaque or translucent. In this case, the substrate 110 can be formed of metal. When the substrate 110 is formed of metal, the substrate 110 may include at least one member selected from the group consisting of carbon, iron, chromium, manganese, nickel, titanium, molybdenum, stainless steel (SUS), Invar alloy, Inconel alloy and Kovar alloy But is not limited thereto. The substrate 110 may be formed of a metal foil.

On the substrate 110, a display unit 120 is formed. The display portion 120 may include an organic light emitting diode (OLED).

Referring to FIG. 2, a barrier layer 111 may be further formed on the substrate 110. The barrier film 111 serves to block oxygen and moisture, prevents diffusion of moisture or impurities through the substrate 110, and provides a flat surface on the top of the substrate 110. The barrier film 111 may be formed to cover the entire upper surface of the substrate 110. The barrier film 111 may include an inorganic film or an organic film. The barrier film 111 may be formed as a single film, or may be laminated with a multilayer film. For example, the barrier film 111 may be formed of an inorganic material such as silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiON), aluminum oxide (AlO), aluminum oxynitride , Polyimide, polyester, and the like. The barrier layer 111 may be deposited by various deposition methods such as plasma enhanced chemical vapor deposition (PECVD), atmospheric pressure CVD (APCVD), and low pressure CVD (LPCVD). The barrier film 111 may not be formed if necessary.

A thin film transistor (TFT) may be formed on the barrier film 111. The thin film transistor TFT is electrically connected to the organic light emitting device OLED to drive the organic light emitting device OLED. This thin film transistor (TFT) is a top gate type and includes an active layer 112 including a source region 113a, a drain region 113b and a channel region 113c; And a gate electrode 115; Can be sequentially included. Although a top gate type thin film transistor (TFT) is exemplified in this specification, it is needless to say that a thin film transistor (TFT) of another structure such as a bottom gate type may be provided.

The active layer 112 may be formed on the barrier layer 111. The active layer 112 may include a source region 113a and a drain region 113b which are doped with impurity ions (N-type or P-type). The active layer 112 may further include a channel region 113c not doped with an impurity ion between the source region 113a and the drain region 113b.

When the active layer 112 is formed of polysilicon, amorphous silicon may be formed and converted into polysilicon by crystallizing the amorphous silicon. In addition, the active layer 112 may be formed of an oxide semiconductor. For example, the oxide semiconductor may be a 4, 12, 13, or 14 Group metal such as zinc (Zn), indium (In), gallium (Ga), tin (Sn), cadmium (Cd), germanium (Ge) ≪ / RTI > elements and combinations thereof.

A gate insulating layer 114 may be deposited on the active layer 112. The gate insulating film 114 includes an inorganic film such as silicon oxide, silicon nitride, or metal oxide. The gate insulating layer 114 shown in FIG. 2 may be a single layer, but is not limited thereto. For example, the gate insulating layer 114 may have a multi-layer structure.

A gate electrode 115 may be formed on a predetermined region of the gate insulating film 114. The gate electrode 115 is connected to a gate line (not shown) for applying on / off signals of the thin film transistor TFT. The gate electrode 115 may include a single layer or multilayer film of Au, Ag, Cu, Ni, Pt, Pd, Al, Mo or Cr or an alloy such as Al: Nd or Mo: W.

An interlayer insulating film 116 may be formed on the gate electrode 115. The interlayer insulating film 116 may be formed of an insulating material such as silicon oxide, silicon nitride, or the like. In addition, the interlayer insulating layer 116 may be formed of an insulating organic layer.

On the interlayer insulating film 116, a source electrode 117a and a drain electrode 117b may be formed. Specifically, a contact hole is formed in the gate insulating film 114 and the interlayer insulating film 116 by removing a part of them, and the source electrode 117a is electrically connected to the source region 113a through the contact hole And the drain electrode 117b may be electrically connected to the drain region 113b.

A passivation film 118 may be formed on the source electrode 117a and the drain electrode 117b. The passivation film 118 may be formed of an inorganic film such as silicon oxide, silicon nitride, or an organic film.

A planarizing film 119 may be formed on the passivation film 118. The planarization film 119 may include a styrene polymer, a phenolic polymer, an acryl polymer, an imide polymer, an aryl ether polymer, an amide polymer, a fluoropolymer, a p-xylene polymer, a vinyl alcohol polymer, .

An organic light emitting device OLED may be formed on the TFT. The organic light emitting diode OLED includes a first electrode 121, a second electrode 122, and an intermediate layer 123 including a light emitting layer interposed between the first electrode 121 and the second electrode 122 do. The first electrode 121 is electrically connected to one of the source electrode 117a and the drain electrode 117b through the contact hole. The first electrode 121 corresponds to the pixel electrode.

The first electrode 121 functions as an anode, for example, and can be connected to an external terminal not shown in the figure. The first electrode 121 may be formed of various conductive materials having a high work function. In the bottom emission type, the first electrode 121 is provided as a light-transmitting electrode and the second electrode 122 is provided as a reflective electrode. In the front emission type, the first electrode 121 is provided as a reflective electrode and the second electrode 122 is provided as a light-transmitting electrode. In the present invention, the bottom emission type is used as a reference, but the embodiment of the present invention is not limited thereto. For example, when the first electrode 121 is used as a light transmitting electrode, the first electrode 121 includes ITO, IZO, ZnO, In ₂ O ₃ , and the like. The first electrode 121 may be patterned in an island shape corresponding to each pixel.

A pixel defining layer (PDL) 124 may be formed on the planarization layer 119 to cover the edge of the first electrode 121 of the organic light emitting diode. The pixel defining layer 124 defines the light emitting region of each sub-pixel by surrounding the edge of the first electrode 121.

The pixel defining layer 124 is formed of an organic material or an inorganic material. For example, the pixel defining layer 124 may be formed of an organic material such as polyimide, polyamide, benzocyclobutene, acrylic polymer, phenol polymer or the like, or an inorganic material such as SiNx. The pixel defining layer 124 may be formed of a single film or may be formed of multiple films.

The intermediate layer 123 may be formed on the exposed region by etching a part of the pixel defining layer 124 on the first electrode 121. [ The intermediate layer 123 may be formed by a deposition process.

The intermediate layer 123 may include a low molecular organic material or a high molecular organic material. The intermediate layer 123 may include at least one organic light emitting layer capable of emitting red, green, blue, or white light. Alternatively, the intermediate layer 123 may include a hole transport layer (HTL) and a hole injection layer (HTL) in the direction of the first electrode 121, and an electron transport layer (ETL) and an electron injection layer (EIL) are stacked in the direction of the second electrode 122. Of course, various layers other than the hole injection layer, the hole transporting layer, the electron transporting layer, and the electron injection layer may be stacked as needed.

A second electrode 122 may be formed on the intermediate layer 123. The second electrode 122 functions as a cathode, for example, and can be connected to an external terminal not shown in the figure. The second electrode may be formed of various conductive materials having a small work function. For example, when the second electrode 122 is used as a reflective electrode, the second electrode 122 includes Li, Ca, LiF / Ca, LiF / Al, Al, Mg, And the second electrode 122 corresponds to the common electrode.

The first electrode 121 is patterned so as to correspond to the opening of each sub-pixel and the second electrode 122 is entirely deposited on the display unit. However, when the second electrode 122 is formed in a specific pattern Of course.

In addition, the first electrode 121 functions as a cathode, and the second electrode 122 functions as an anode.

On the other hand, the first electrode 121 and the second electrode 121 are insulated from each other by the intermediate layer 123. When a voltage is applied to the first electrode 121 and the second electrode 122, visible light is emitted from the intermediate layer 123 to realize an image that the user can recognize.

The substrate 110 having the display unit 120 is adhered to the sealing substrate 130 disposed on the display unit 120. At this time, the substrate 110 and the sealing substrate 130 are bonded together by the sealing member 160.

The sealing substrate 130 may seal the display unit 120 to prevent external moisture or oxygen from penetrating into the display unit 120. In addition, the sealing substrate 130 may include a plurality of inorganic films and a plurality of organic films which are alternately stacked.

The plurality of inorganic films may be a single film or a laminated film containing a metal oxide or a metal nitride. For example, the plurality of inorganic films may include any one of SiN _x , Al ₂ O ₃ , SiO ₂ , and TiO ₂ .

The plurality of organic films mitigates the internal stress of the inorganic films and functions to complement and planarize the defects of the inorganic films. Each of the plurality of organic films may be a single film or a laminated film formed of a polymer and preferably formed of any one of polyethylene terephthalate, polyimide, polycarbonate, epoxy, polyethylene and polyacrylate.

A filling material 140 is provided inside the sealing member 160. More specifically, the filling material 140 is provided to fill a space between the substrate 110 and the sealing substrate 130. [ Accordingly, the filler 140 may be provided to cover the display unit 120, but the present invention is not limited thereto. The light scattering particles 150 may be dispersed in the filler 140. [ In addition, the refractive index of the filler 140 may be different from the refractive index of the light scattering particles 150. If the refractive index of the filler 140 is different from the refractive index of the light scattering particles 150, the light passing through the filler 140 and the light scattering particles 150 may be refracted and the light may be scattered, May be small.

For example, the difference between the refractive index of the filler and the refractive index of the light scattering particles may be greater than 0 and less than or equal to 0.20. As another example, the difference between the refractive index of the filler and the refractive index of the light scattering particles may be 0.10 to 0.15 But is not limited thereto.

The filler 140 may absorb an external impact applied to the OLED display 100. The filler 140 may be formed of a material having a refractive index of 1.41 to 1.54, and may be formed in a liquid or solid state. For example, the filler material 140 may include a polymer having siloxane repeating units, and may specifically include polydimethylsiloxane (PDMS).

The light scattering particles 150 may comprise a core and a shell. When the light scattering particles 150 include a core and a shell, the refractive index of the light scattering particles 150 can be easily adjusted to a desired value. The light scattering particles 150 may have a refractive index of more than 1.41 and not more than 1.60. At this time, the difference between the refractive index of the core and the refractive index of the shell may be 0 or more and 0.12 or less. For example, the refractive index of the core may be 1.57 to 1.60, but is not limited thereto.

For example, the refractive index of the shell may be 1.48 to 1.52, but is not limited thereto.

The core and the shell may be made of materials different from each other, but are not limited thereto.

In one embodiment, the core and the shell may be made of one or more selected from the group consisting of a styrenic polymer, an acrylate polymer, an ethylene polymer, a propylene polymer, a siloxane polymer, a vinyl polymer, But is not limited thereto. The styrene-based polymer, the acrylate-based polymer, the ethylene-based polymer, the propylene-based polymer, the siloxane-based polymer and the vinyl-based polymer each include a homopolymer and a copolymer thereof. , Random copolymers, and the like.

In another embodiment, the core and the shell may independently include, but are not limited to, a styrene-based polymer, an acrylate-based polymer, and a combination thereof.

In another embodiment, the core may comprise at least one selected from styrene homopolymers and styrenic copolymers, but is not limited thereto. The shell may include at least one selected from an acrylate homopolymer and an acrylate-based copolymer, but is not limited thereto.

In another embodiment, the core comprises polystyrene, and the shell may comprise at least one selected from polymethacrylate and poly (methyl methacrylate), but is not limited thereto.

The content of the light scattering particles 150 in the filler 140 may be 0.01 wt% to 50 wt%. For example, the content of the light scattering particles 150 in the filler 140 may be 1 wt% to 15 wt%, but is not limited thereto. When the above range is satisfied, it is possible to provide an organic light emitting display device in which the color variation with respect to the viewing angle is sufficiently small while the rate of decrease in front luminance is sufficiently low.

The particle size of the light scattering particles 150 may be 0.5 탆 to 3 탆. The average particle diameter (D ₅₀ ) of the light scattering particles 150 may be 1 탆 to 3 탆. When the above range is satisfied, not only the image realized by the display unit can be not distorted, but also the content of the light scattering particles 150 in the filler 140 can be easily adjusted. In addition, if the above range is not satisfied, the degree of scattering of light becomes small as the difference between the wavelength of light and the light scattering particles 150 increases, and the degree of improvement in color deviation according to the viewing angle may be insignificant.

The light scattering particles 150 may have a weight change rate of less than 1% after 4 hours at 25 ° C and 95% relative humidity. When the above range is satisfied, it is possible to provide an organic light emitting display device having a high reliability (in particular, a storage reliability and a degree of occurrence of a dark spot).

The glass transition temperature of the light scattering particles 150 may be 0 ° C or higher.

The compressive strength of the light scattering particles 150 may be 10 kg / mm ² or less. If the above range is satisfied, the step of providing the light scattering particles 150 can be carried out by the light scattering particles 150 without damaging the other layer (for example, the layer in which the light scattering particles 150 are provided, Emitting display device can be manufactured.

Meanwhile, the filler 140 and the light scattering particles 150 may be composed of a thermosetting type, a light-curing type or a hybrid curing type material, respectively. The light scattering particles 150 can be evenly dispersed in the filler 140 and the light scattering particles 150 can be uniformly dispersed in the filler 140. [ 150 can be reduced by self-weight. Therefore, it may also be advantageous in terms of manufacturing an organic light emitting display device.

The organic light emitting diode display device 100 according to an embodiment of the present invention may further include a getter 170 disposed inside the sealing member 160. The getter 170 easily reacts with moisture and oxygen to prevent the organic light emitting diode OLED and the like from being deteriorated in life due to moisture and oxygen. The getter 170 may be made of any one or a mixture of alkali metal oxides, alkaline earth metal oxides, metal halides, lithium sulfates, metal sulfates, metals and chlorates, silica gel and phosphorus pentoxide, but is not limited thereto . The kind and position of the getter 170 are not limited to those described above.

The organic light emitting display device 100 according to an embodiment of the present invention may further include a spacer located in the filler. The spacers allow the distance between the substrate and the encapsulation substrate to be maintained constant. The diameter of the spacer may be 2 nm to 3 nm smaller than the distance between the substrate and the encapsulation substrate, but is not limited thereto.

4 is a schematic partial cross-sectional view illustrating an organic light emitting display device according to another embodiment of the present invention.

Referring to FIG. 3, the organic light emitting display device 200 according to another embodiment of the present invention includes a color filter 270 and a black matrix 280 in the organic light emitting display device 100 of FIG. 1 Lt; / RTI >

The color filter 270 is interposed between the substrate 110 and the sealing substrate 130, and a plurality of color filters 270 are interposed in each of the regions corresponding to the intermediate layer of the display portion 120. The color filter 270 may include a pigment capable of expressing various colors emitted from the organic light emitting layer of the intermediate layer, i.e., red, blue, green, and white. Depending on the kind of the pigment, the color that the color filter 270 can express is determined. The color filter 270 can effectively transmit light of a color represented by the organic light emitting layer of the intermediate layer to the outside.

A black matrix 280 is interposed between each of the color filters 270 and can absorb or reflect visible light. The black matrix 280 may function to cut off light reflected by the organic light emitting display device from the outside.

1 and 2, for the substrate 110, the display portion 120, the sealing substrate 130, the filler 140, the light scattering particles 150, the sealing member 160 and the getter 170, And therefore the detailed description thereof will be omitted here.

According to another aspect of the present invention, there is provided a method of manufacturing an organic light emitting display device, comprising: forming a display on a surface of a substrate; Forming a sealing member on an outer periphery of the display unit on the substrate; Filling the filler and light scattering particles inside the sealing member on the substrate; And bonding the base and the sealing substrate via the sealing member, wherein the light scattering particle includes a core and a shell, and the refractive index of the filling material may be smaller than the refractive index of the light scattering particle.

First, a display portion is formed on one surface of a substrate. The display unit is the same as that described with reference to FIGS. 1 and 2, and various known organic light emitting displays can be applied, so that a specific manufacturing method thereof will be omitted.

Next, a sealing member is formed on the outside of the display portion on the substrate. The sealing member can be formed by a method of applying a liquid or paste sealing member. The sealing member is formed on one surface of the substrate, but the present invention is not limited to this, and the sealing member may be formed on one surface of the sealing substrate.

Next, filler and light scattering particles are filled in the inside of the sealing member. The filler and the light scattering particles can be filled by various known methods.

In the above, the order of forming the sealing member first and then forming the filler and the light scattering particle has been described, but the present invention is not limited to this. The filling material and the light scattering particles may be irregularly pushed out during the dispensing, so that the sealing member may be formed first and then the filling material and the light scattering particles may be dispensed.

Further, a getter can be further formed inside the sealing member. The getter can be formed by applying a liquid getter.

Next, the substrate and the sealing substrate are bonded to each other via the sealing member. More specifically, the substrate and the encapsulation substrate are disposed so as to face each other, and the substrate and the encapsulation substrate are bonded together by irradiating ultraviolet rays onto the substrate and the encapsulation substrate corresponding to the encapsulation member in a vacuum state. In case of cementing in vacuum, the permeation of external moisture and foreign matter can be reduced. When the substrate and the encapsulation substrate are irradiated with ultraviolet light, a portion in contact with the encapsulation member is melted and the substrate and the encapsulation substrate can be bonded. However, this can bond the substrate and the sealing substrate in various ways depending on the type of the sealing member in an exemplary manner.

Next, the color variation improvement rate and the front luminance reduction rate according to the viewing angle of the organic light emitting display device 100 constructed using the filler 140 and the light scattering particles 150 will be described with reference to Table 1.

Here, the color variation improvement ratio according to the viewing angle is an item for evaluating the change of the color coordinate characteristic of light according to the viewing angle with respect to the organic light emitting display device 100, and is an index for confirming the degree of improvement of the wide viewing angle. More specifically, it can be seen how the amount of change in the color coordinates of the light observed at the side of the predetermined angle with respect to the front surface perpendicular to the display screen in the organic light emitting display device is improved.

In addition, the rate of decrease of the front luminance is an index indicating how much the luminance observed at the side of the predetermined angle decreases with respect to the luminance observed at the front face of the organic light emitting display device.

Here, the higher the improvement rate of the color deviation according to the viewing angle, the less the difference in the color coordinate change when viewed obliquely from the side than the front of the display, and the lower the front luminance lowering rate, It means that the luminance is close to the luminance observed at the front.

Table 1 below shows the color deviation improvement rate and the front luminance reduction ratio according to the viewing angles according to presence or absence of light scattering particles. At this time, the light-scattering particle is composed of polystyrene having a refractive index of 1.59 and poly (methyl methacrylate) having a refractive index of 1.49, and the refractive index of the overall light scattering particle is 1.52. Further, the filler is composed of polydimethylsiloxane having a refractive index of 1.41, and the light scattering particles are contained in the filler in an amount of 10% by weight.

Presence or absence of light scattering particles Color deviation improvement rate
(%) Front luminance reduction rate
(%) include 0 0 Without 40 8

Referring to Table 1, it can be seen that the improvement in the color deviation improvement of the organic light emitting display device including the light scattering particles including the core and the shell is greatly improved.

Table 2 below shows the improvement in color deviation and the rate of decrease in front luminance according to the viewing angle according to the content of light scattering particles. At this time, the light-scattering particle is composed of polystyrene having a refractive index of 1.59 and poly (methyl methacrylate) having a refractive index of 1.49, and the refractive index of the overall light scattering particle is 1.52. Further, the filler is composed of polydimethylsiloxane having a refractive index of 1.41, and the light scattering particles are contained in the filler in an amount of 10% by weight.

Light scattering particle content
(weight %) Color deviation improvement rate
(%) Front luminance reduction rate
(%) 7.5 35 7 10 40 8 12.5 45 10 15 50 12

Referring to Table 2, the organic light emitting display device including the light scattering particles including the core and the shell increases the color deviation improvement ratio and the front luminance reduction ratio as the content of the light scattering particles increases. However, the organic light emitting display devices having the color variation improvement rate and the front luminance lowering rate shown in Table 2 all exhibit a wide viewing angle of a desired level and improved reliability.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the exemplary embodiments, and that various changes and modifications may be made therein without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100, 200: organic light emitting display device 150: light scattering particle
110: substrate 160: sealing member
120: display unit 170: getter
130: sealing substrate 270: color filter
140: filler 280: black matrix

Claims (20)

Board;
A display unit disposed on the substrate;
An encapsulation substrate opposed to the substrate and disposed on the display;
A sealing member formed on an outer periphery of the display unit to bond the substrate and the sealing substrate;
A filler filled between the substrate and the encapsulation substrate, inside the encapsulation member; And
And light scattering particles dispersed in the filler,
Wherein the light scattering particles comprise a core and a shell,
Wherein the refractive index of the filler is different from the refractive index of the light scattering particles. The method according to claim 1,
Wherein a difference between a refractive index of the filler and a refractive index of the light scattering particles is more than 0 and not more than 0.20. The method according to claim 1,
Wherein a difference between a refractive index of the filler and a refractive index of the light scattering particles is 0.10 to 0.15. The method according to claim 1,
And the refractive index of the filler is not less than 1.41 and not more than 1.54. The method according to claim 1,
Wherein the filler comprises a polymer having siloxane repeat units. The method according to claim 1,
Wherein a refractive index of the light scattering particles is greater than 1.41 and not greater than 1.60. The method according to claim 1,
Wherein the core has a refractive index of 1.57 to 1.60. The method according to claim 1,
And the refractive index of the shell is 1.48 to 1.52. The method according to claim 1,
Wherein the core and the shell each independently comprise at least one selected from the group consisting of a styrenic polymer, an acrylate polymer, an ethylene polymer, a propylene polymer, a siloxane polymer, a vinyl polymer, . The method according to claim 1,
Wherein the core comprises at least one selected from a styrene homopolymer and a styrenic copolymer. The method according to claim 1,
Wherein the shell comprises at least one selected from an acrylate homopolymer and an acrylate-based copolymer. The method according to claim 1,
Wherein the core comprises polystyrene,
Wherein the shell comprises at least one selected from the group consisting of polymethacrylate and poly (methyl methacrylate). The method according to claim 1,
Wherein the content of the light scattering particles in the filler is 0.01 wt% to 50 wt%. The method according to claim 1,
And the content of the light scattering particles in the filler is 1 wt% to 15 wt%. The method according to claim 1,
And a getter disposed inside the sealing member. The method according to claim 1,
And a spacer located in the filler. The method according to claim 1,
Wherein the display unit includes an organic light emitting element,
The organic light-
A first electrode disposed on the substrate; A second electrode facing the first electrode; And an organic layer including a light emitting layer interposed between the first electrode and the second electrode. 18. The method of claim 17,
Further comprising a plurality of color filters interposed between the substrate and the encapsulation substrate,
Wherein the plurality of color filters are disposed in a region corresponding to the organic layer. 19. The method of claim 18,
And a black matrix interposed between the respective color filters. Forming a display portion on one side of the substrate;
Forming a sealing member on an outer periphery of the display unit on the substrate;
Filling the filler and light scattering particles inside the sealing member on the substrate; And
And bonding the base and the sealing substrate via the sealing member,
Wherein the light scattering particles comprise a core and a shell,
Wherein the refractive index of the filler is smaller than the refractive index of the light scattering particles.

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