KR20170067361A - Organic light emitting display device - Google Patents

Abstract

The present disclosure discloses an organic light emitting display. The organic light emitting display includes a first substrate on which an array of pixels is arranged; And a second substrate having a color layer corresponding to each pixel and a black matrix for distinguishing each pixel on a surface facing the first substrate, wherein an interval between the first substrate and the second substrate is a specific To prevent light emitted from the pixel from leaking into neighboring pixels.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting diode (OLED) display, and more particularly, to an organic light emitting diode (OLED) display.

The image display device that realizes various information on the screen is a core technology of the information communication age and it is becoming thinner, lighter, more portable and higher performance. Therefore, an organic light emitting display device for displaying an image by controlling the amount of emitted light of the organic light emitting layer has attracted attention.

The organic light emitting display device has an advantage that it can be made thin as a self-luminous element using a thin light emitting layer between electrodes. A general organic light emitting display has a structure in which a pixel driving circuit and an organic light emitting element are formed on a substrate, and light emitted from the organic light emitting element passes through a substrate or a barrier layer to display an image.

There has been an increasing number of cases in which the organic light emitting display device is applied to a large display device such as a large-sized TV or an electric signboard. These display devices are often viewed from different angles by a plurality of users at the same time. In this case, a light source may be generated at a specific viewing angle, a color to be visually observed may vary, or an image quality and / or visibility degradation phenomenon There is a possibility of occurrence.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an organic light emitting display device in which a phenomenon of decline of visibility according to a viewing angle is prevented. It is another object of the present invention to provide a structure applied to the organic light emitting diode display.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, an organic light emitting display is provided. The OLED display includes a first substrate on which an array of pixels is arranged; And a second substrate having a color layer corresponding to each pixel and a black matrix for distinguishing each pixel on a surface facing the first substrate, wherein an interval between the first substrate and the second substrate is a specific To prevent light emitted from the pixel from leaking into neighboring pixels.

According to another embodiment of the present invention, an organic light emitting display is provided. The organic light emitting display includes a color filter substrate including a black matrix; An array substrate facing the color filter substrate; Wherein the color filter substrate and the array substrate are opposed to each other with a gap determined based on a refractive index of the filler and a line width of the black matrix, Can be minimized.

The details of other embodiments are included in the detailed description and drawings.

Embodiments of the present invention can provide a structure in which light scattering to neighboring pixels is prevented based on properties of fillers, criteria for evaluating visibility, and the like. Accordingly, the organic light emitting diode display according to the embodiment of the present invention can prevent light spots and minimize the variation of visibility according to the viewing angle. This advantage is suitable to be applied to a large-screen display device.

The effects according to the embodiments of the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a plan view showing an organic light emitting display according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a portion of a display region of an organic light emitting display according to an embodiment of the present invention.
3 is a cross-sectional view illustrating an organic light emitting display according to an embodiment of the present invention.
4A and 4B are diagrams showing a color defect phenomenon that may occur in an organic light emitting display device.
5 is a view illustrating an organic light emitting display according to an embodiment of the present invention.

Brief Description of the Drawings The advantages and features of the present disclosure, and how to accomplish them, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise. In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions. An element or layer is referred to as being another element or layer "on ", including both intervening layers or other elements directly on or in between. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

Although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

The sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown. Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 is a plan view showing an organic light emitting display according to an embodiment of the present invention.

Referring to FIG. 1, the OLED display 100 includes at least one active area (A / A), and an array of pixels is disposed in the display area. At least one non-display area (I / A) may be disposed around the display area. That is, the non-display area may be adjacent to one or more sides of the display area. In Fig. 1, the non-display area surrounds a display area of a rectangular shape. However, the shape of the display region and the shape / arrangement of the non-display region adjacent to the display region are not limited to the example shown in Fig. The display area and the non-display area may be in a form suitable for the design of the electronic device on which the display device 100 is mounted. Illustrative forms of the display area are pentagonal, hexagonal, circular, oval, and the like.

Each pixel in the display area may be associated with a pixel driving circuit. The pixel driving circuit may include one or more switching transistors and one or more driving transistors. Each pixel driving circuit may be electrically connected to a gate line and a data line to communicate with a gate driver, a data driver, and the like located in the non-display area.

The gate driver and the data driver may be implemented as a thin film transistor (TFT) in the non-display region. Such a driver may be referred to as a gate-in-panel (GIP). In addition, some components, such as a data driver IC, are mounted on a separate printed circuit board, and circuit films such as flexible printed circuit boards (FPCB), chip-on-film (COF), tape- (Pads, bumps, pins, etc.) disposed in the non-display area. The printed circuit (COF, PCB, etc.) may be located behind the display device 100.

The organic light emitting display 100 may include various additional components for generating various signals or driving pixels in the display area. The additional element for driving the pixel may include an inverter circuit, a multiplexer, an electrostatic discharge circuit, and the like. The OLED display 100 may also include additional components associated with functions other than pixel driving. For example, the organic light emitting diode display 100 may include additional elements for providing a touch sensing function, a user authentication function (e.g., fingerprint recognition), a multi-level pressure sensing function, a tactile feedback function, have. The above-mentioned additional elements may be located in the non-display area and / or an external circuit connected to the connection interface.

The organic light emitting display according to the present invention includes a lower substrate 101, a thin film transistor on the lower substrate 101, an organic light emitting device, a side encapsulating structure 150 disposed outside the display area A / A, A fill 120 filling the space inside the side sealing structure 150, and the like. The lower substrate (or array substrate) may also be referred to as a concept including an element and a functional layer formed thereon, for example, a switching TFT, a driving TFT connected to the switching TFT, an organic light emitting element connected to the driving TFT,

The lower substrate 101 supports various components of the OLED display 100. The lower substrate 101 may be formed of a transparent insulating material, for example, an insulating material such as glass, plastic, or the like.

An organic light emitting element is disposed on the lower substrate 101. The organic light emitting device includes an anode, an organic light emitting layer formed on the anode, and a cathode formed on the organic light emitting layer. The organic light emitting device may have a single light emitting layer structure that emits one light or a plurality of light emitting layers that emits white light. The organic light emitting device may be formed in the central portion of the lower substrate 101 to correspond to the display area. When the organic light emitting element emits white light, a color filter may further be provided.

A passivation layer may cover the organic light emitting device. The protective layer protects the organic light emitting element from external moisture or oxygen.

The side sealing structure 150 is positioned between the upper substrate and the lower substrate and serves to block water and / or oxygen penetrating the side of the display device 100. The side sealing structure 150 may also be referred to as a dam, an edge seal, or a side seal.

The filler material 120 fills the space between the organic light emitting device of the first substrate 101 and the upper substrate (sealing substrate). That is, the space between the lower and upper substrates is filled in the space inside the side encapsulating structure 150.

2 is a cross-sectional view illustrating a portion of a display region of an organic light emitting display according to an embodiment of the present invention.

Referring to FIG. 2, an array of thin film transistors 102, 104, 106, and 108, an array of organic light emitting devices 112, 114, and 116, and various functional layers are disposed on a first substrate 101.

The first substrate (or array substrate) may be a glass or plastic substrate. In the case of a plastic substrate, a polyimide-based material or a polycarbonate-based material may be used to have flexibility.

The thin film transistor has a structure in which a semiconductor layer 102, a gate insulating film 103, a gate electrode 104, an interlayer insulating film 105, and source and drain electrodes 106 and 108 are sequentially arranged on a first substrate 101 Lt; / RTI >

The semiconductor layer 102 may be made of polysilicon (p-Si), in which case a predetermined region may be doped with an impurity. Further, the semiconductor layer 102 may be made of amorphous silicon (a-Si), or may be made of various organic semiconductor materials such as pentacene. Further, the semiconductor layer 102 may be made of oxide.

The gate insulating film 103 may be formed of an insulating inorganic material such as silicon oxide (SiOx) or silicon nitride (SiNx), or may be formed of an insulating organic material or the like. The gate electrode 104 may be formed of various conductive materials such as Mg, Al, Ni, Cr, Mo, W, Au, Or the like.

The interlayer insulating film 105 may be formed of an insulating material such as silicon oxide (SiOx) or silicon nitride (SiNx), or may be formed of an insulating organic material or the like. A contact hole through which the source and drain regions are exposed may be formed by selective removal of the interlayer insulating film 105 and the gate insulating film 103.

The source and drain electrodes 106 and 108 are formed on the interlayer insulating film 105 in the form of a single layer or a multilayered material for the gate electrode 104.

The flat film 107 may be positioned on the thin film transistor. The planarizing film 107 protects and flattens the thin film transistor. The flattening film 107 may be formed in various shapes, and may be formed of an organic insulating film such as BCB (benzocyclobutene) or acrylic, or an inorganic insulating film such as a silicon nitride film (SiNx) or a silicon oxide film (SiOx) It may be formed as a single layer, or it may be composed of a double layer or a multi layer.

The organic light emitting device may have a structure in which a first electrode 112, an organic light emitting layer 114, and a second electrode 116 are sequentially arranged. That is, the organic light emitting device includes a first electrode 112 formed on the protective film 107, an organic light emitting layer 114 disposed on the first electrode 112, and a second electrode 116 disposed on the organic light emitting layer 114 ).

The first electrode 112 is electrically connected to the drain electrode 108 of the driving thin film transistor through the contact hole. When the organic light emitting display 100 is a top emission type, the first electrode 112 may be made of an opaque conductive material having high reflectance. For example, the first electrode 112 may be formed of silver (Ag), aluminum (Al), gold (Au), molybdenum (Mo), tungsten (W), chromium (Cr) .

The bank 110 is formed in the remaining region except for the light emitting region. Accordingly, the bank 110 has a bank hole for exposing the first electrode 112 corresponding to the light emitting region. The bank 110 may be made of an inorganic insulating material such as a silicon nitride film (SiNx), a silicon oxide film (SiOx), or an organic insulating material such as BCB, acrylic resin or imide resin.

The organic light emitting layer 114 is positioned on the first electrode 112 exposed by the bank 110. [ The organic light emitting layer 114 may include a light emitting layer, an electron injection layer, an electron transport layer, a hole transport layer, a hole injection layer, and the like.

And the second electrode 116 is located on the organic light emitting layer 114. When the OLED display 100 is a top emission type, the second electrode 116 may be a transparent conductive layer such as indium tin oxide (ITO) or indium zinc oxide (IZO) Thereby emitting the light generated in the organic light emitting layer 114 to the upper portion of the second electrode 116.

The protective layer 118 is located on the second electrode 116. At this time, the passivation layer may be formed of an inorganic film made of glass, metal, aluminum oxide (AlOx) or silicon (Si) based material, or alternatively, an organic film and an inorganic film may be alternately laminated. The protective layer 118 prevents oxygen and moisture penetration from the outside in order to prevent oxidation of the light emitting material and the electrode material. When the organic light emitting device is exposed to moisture or oxygen, a pixel shrinkage phenomenon in which the light emitting region is reduced or a dark spot in the light emitting region may occur.

The filler material 120 is located on top of the protective layer 118 and fills a space between the protective layer 118 and the second substrate 180. The filler material 120 may be made of a material that can be cured both in ultraviolet rays and in heat. As the material of the filler material 120, acrylic resin, epoxy resin, silicone resin, rubber resin, or a mixture thereof may be used.

The second substrate 180 faces the first substrate 101. The second substrate may be an encapsulation plate. The lower surface of the second substrate 180 may be in contact with the filler 120. The second substrate 180 may be formed of a material such as glass, polymer, metal, or the like, and the material of the second substrate 180 may be determined according to the emission direction of the organic light emitting display 100. On the other hand, in the case of the white organic light emitting type, the second substrate 180 may be provided with color filters and a black matrix for partitioning them.

On the other hand, a lower adhesive layer 160 and a lower sealing layer 170 are sequentially formed under the first substrate 101. The lower encapsulation layer 170 may be formed of a material selected from the group consisting of polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethylene ether phthalate, polycarbonate, polyarylate, And may be formed of at least one organic material selected from polyether imide, polyether sulfonate, polyimide, or polyacrylate. The lower sealing layer 170 serves to prevent water or oxygen from penetrating into the substrate from the outside.

The lower adhesive layer 160 is formed of a thermosetting or natural curing adhesive and serves to adhere the lower substrate 101 to the lower sealing layer 170. For example, the lower adhesive layer 160 may be formed of a material such as OCA (Optical Cleared Adhesive).

3 is a cross-sectional view illustrating an organic light emitting display according to an embodiment of the present invention.

The OLED display 100 includes an array substrate 110, a pixel driving circuit and an organic light emitting diode (TFT) / OLED, a passivation layer 118, a side encapsulation structure 150, a filling layer 120, 180).

The array substrate (first substrate) is formed of an insulating material and supports various components of the OLED display 100.

A pixel driving circuit and an organic light emitting element (TFT / OLED) are disposed on the array substrate 110. The organic light emitting device includes an anode, an organic light emitting layer formed on the anode, and a cathode formed on the organic light emitting layer. The organic light emitting layer may have a single light emitting layer structure that emits one light or a structure that includes a plurality of light emitting layers to emit white light. The organic light emitting device may be formed in the central portion of the array substrate 110 to correspond to the display area. Various devices and wirings such as a pixel driver circuit for driving the organic light emitting element, i.e., a thin film transistor, a capacitor, and the like may be disposed in association with the organic light emitting element. The exemplary structure and function of the pixel driver circuit and the organic light emitting element are substantially the same as those described in Fig.

The pixel driving circuit and the organic light emitting device (TFT / OLED) are layers on which a display element such as data lines, gate lines, thin film transistors, and organic light emitting diodes are formed on the first substrate 101.

The passivation layer 118 covers the pixel driving circuit and the organic light emitting diode (TFT / OLED) to prevent oxygen and moisture from penetrating into the inside thereof. The protective layer 118 may be composed of a plurality of layers in which an inorganic protective film and an organic protective film are alternately arranged. The inorganic protective film is more suitable than the organic protective film in preventing penetration of oxygen and moisture, and the organic protective film can complement the impact resistance of the inorganic protective film.

The side encapsulation structure 150 blocks oxygen and moisture penetrating between the sides of the display device and / or between both substrates. When the organic light emitting device is exposed to moisture or oxygen, a pixel shrinkage phenomenon in which the light emitting region is reduced or a dark spot in the light emitting region may occur. Although the side encapsulation structure 150 is shown as being spaced apart from the passivation layer 118 in Figure 3, the side encapsulation structure 150 may be partially overlapped with the edge of the passivation layer 118.

The filling layer 120 is filled in the space between the protective layer 118 on the first substrate 101 and the second substrate 180. At this time, the filling layer 120 may be filled in the side sealing structure 120. The filling layer 120 may be made of a material that can be cured both in ultraviolet rays and in heat. As the material of the filling layer 120, an acrylic type, an epoxy type, a silicone type, an olefin type resin, or a mixture thereof may be used. The filler layer 118 has a viscosity of approximately 1,000 to 50,000 cp and can be applied by screen printing, ink-jet, slot dye coating, or the like.

The second substrate (encapsulation substrate) is placed on the filling layer 120. In the case of the white organic light emitting type, the second substrate 180 may be provided with color filters and a black matrix for partitioning them. The first substrate 101 on which the pixel driving circuit and the organic light emitting element TFT / OLED and the protective layer 118 are positioned is aligned to face the filling layer 118 located on the second substrate 180, The first substrate 101 and the second substrate 180 are bonded together by vacuum bonding or the like.

4A and 4B are diagrams showing a color defect phenomenon that may occur in an organic light emitting display device.

In the case of a top emission display device using a color filter in a white OLED type display device, color defects may be caused depending on the viewing angle. The color defect refers to a phenomenon in which the colors of adjacent (sub) pixels are observed in accordance with the viewing angle of the display screen, that is, the viewing angle. For example, light emitted to express a red (R) pixel is introduced into adjacent green (G) or blue (B) pixels, and red (green) or blue (green) is mixed. This phenomenon is attributed to light scattering from a specific pixel to an adjacent pixel.

Hereinafter, the cause of the color defect phenomenon will be described with reference to FIGS. 4A and 4B. 4A and 4B are views showing a part of a pixel region.

The visibility according to the viewing angle is evaluated mainly at a viewing angle of 60 °. That is, it is observed and evaluated at a point where? ₂ is 60 °. At this time, the light observed at a viewing angle of 60 ° is a light having an angle of refraction (= θ ₂ ) of 60 ° and traveling from the inside of the display (medium 1) to the outside of the display (medium 2). The incident angle? _{1 at} which the light is incident on the upper substrate 180 can be calculated using the following Snell's law.

Where n ₁ is the refractive index of the first medium, n ₂ is the refractive index of the first medium, θ ₁ is the angle of incidence from the first medium to the second medium, and θ ₂ is the refractive angle in the second medium.

In the organic light emitting display, light emitted from the organic light emitting layer on the anode 112 passes through the filler layer 112, the color layer, and the upper substrate, and is recognized from outside. At this time, since there is almost no refraction of light by the cathode, the protective layer, the color layer, and the upper substrate (in the case of glass), Snell's law can be applied as follows.

The first medium is the filler layer 120 and the second medium is air. Epoxy, olefin, etc. are mainly used for the filling layer 120, and the refractive index thereof is about 1,55. And the refractive index of air is 1.0. Therefore, n ₁ is about 1.55, n ₂ is about 1.0, and θ ₂ is about 60 °, so θ ₁ obtained by the above equation is about 34 °. That is, some of the light emitted from a specific pixel may have an incident angle of about 34 degrees and enter the color layer of the neighboring pixel and the upper substrate. Some of this light can cause color flaws by expressing the color of (unwanted) neighboring pixels.

It is seen that the above-mentioned color defect is recognized. First, when the width of the bank 110 is smaller than the width of the black matrix 181 as shown in FIG. 4A, light having an incident angle of about 34 degrees causing color defects is not sufficiently covered by the bank 110, It is possible to generate light spots due to the color layer of < RTI ID = 0.0 & The phenomenon shown in FIG. 4A may occur even if there is no misalignment of the upper and lower substrates.

As an alternative to this, even if the width of the bank 110 is made larger than the width of the black matrix 181 as shown in FIG. 4B, if the cell gap is too large, Can be recognized.

In the case of a large display device (for example, a large-sized TV), a plurality of people view the screen at different angles, so that they have to be well visible at each viewing angle. However, as shown in FIGS. 4A and 4B, when a light spot is generated in a neighboring pixel, the color to be visually recognized varies depending on the viewing angle, and the display quality may be undervalued. Therefore, the phenomenon that light for expressing the color of a specific pixel leaks to a neighboring pixel needs to be solved.

5 is a view illustrating an organic light emitting display according to an embodiment of the present invention.

The inventor of the present invention has recognized the problems described in FIGS. 4A and 4B and invented an organic light emitting display having a structure capable of solving the phenomenon of light leakage to neighboring pixels. The OLED display includes a first substrate (array substrate), a second substrate (color filter substrate), and a filler between the first substrate and the second substrate. A filler (120) is provided between the color filter substrate and the array substrate. The two substrates face each other with a gap determined based on the refractive index of the filler and the line width of the black matrix. Accordingly, the organic light emitting display according to the embodiment of the present invention has a structure in which color mixing by light emitted from adjacent pixels is minimized.

5, a portion under the planarization layer 107 of the first substrate is omitted. [0070] The organic emission layer, the cathode, and the protective layer on the anode 112 are also omitted. And FIG. 3, respectively.

The array substrate (first substrate) is arranged with an array of pixels (pixel driving circuits, organic light emitting elements, etc.) and faces the color filter substrate (second substrate). The second substrate 180 includes R / G / B color layers 182R and 182G corresponding to respective pixels and a black matrix 181 for distinguishing between different pixels on a surface facing the first substrate. The organic light emitting device included in the pixels of the first substrate may be configured to emit white light in a top emission mode. A filler layer 120 is formed between the first substrate and the second substrate 180 to fill a space between the two substrates. The filling layer 120 may be an epoxy-based or olefin-based material. The organic light emitting diode display may further include a dam (150 in FIG. 3) between the first substrate and the second substrate to surround the outside of the filling layer 120.

The gap between the first substrate and the second substrate is provided to prevent light emitted from a specific pixel from leaking into neighboring pixels. At this time, the cell gap between the first substrate and the second substrate may be defined as a (shortest) distance between the bank 110 and the black matrix 181 as shown in FIG.

As described with reference to FIG. 4B, even if the width of the bank is wider than the width of the black matrix, a light spot may be generated, so that the cell gap is sufficiently small to prevent light leakage.

Therefore, in the display device according to the embodiment of the present invention, the width W _BK of the bank 110 is wider than the width W _BM of the black matrix 181. Here, the width of the black matrix 181 means the line width thereof. That is, the width in the direction perpendicular to the extending direction of the black matrix 181. [ The width of the bank 110 is also the same, which can be clearly understood with reference to FIG. For example, the width W _BM of the black matrix 181 may be 18 micrometers and the width W _BK of the bank 110 may be 24 micrometers.

Furthermore, in the organic light emitting display according to the embodiment of the present invention, the cell gap may be spaced apart by a distance at which a color of neighboring pixels is not recognized at a predetermined viewing angle. The viewing angle may be 60 DEG or less with respect to the normal direction of the second substrate 180. [

The cell gap as much as the color of the neighboring pixel is not recognized can be calculated based on the refractive index of the filling layer and the refractive index of air outside the OLED display.

Θ ₂ where the light beam begins to occur Light traveling in the field of view angle, and a refractive index of visible light of the refractive index from n ₁ of the first medium (packed bed) progress has n ₂ of the second medium angles of incidence to the (external air) θ ₁ and refractive angle θ ₂ . In this case, the following expression (1) is satisfied.

Further, in a right triangle having a width (W _BM ) of the black matrix as the base and a cell gap as the height, the following equation (2) holds.

The above equations (1) and (2) are summarized for 'Cell Gap'.

Here, n ₁ is the refractive index of the filling layer, n ₂ is the refractive index of air, and θ ₂ is the viewing angle.

Therefore, the optimal cell gap at which no light spots from the specific viewing angle [theta] ₂ to the neighboring pixels occur

For example, if the refractive index of the filling layer 120 is about 1.55, the refractive index of the air is 1.0, and the viewing angle is 60 ° (general evaluation point), light emitted from a specific pixel (R pixel) There may be light incident on the upper substrate corresponding to a neighboring sub pixel (G pixel). Such light may cause color mixing by the light source. In this case, if the cell gap is less than 1.48 times the width of the black matrix, that is,

Cell gap <1.48 * width of black matrix (W _BM ), 1.48 = tan (90 ° - 34 °)

, It is possible to prevent the light spots and the color mixture.

If the cell gap of the white organic light emitting display is designed in consideration of the refractive index of the filling layer, the viewing angle, and the width (width) of the black matrix, Can be minimized. This advantage can be more effective when applied to a large-screen organic light emitting display.

While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments, and various modifications may be made without departing from the scope of the present invention. Therefore, the embodiments disclosed herein are for the purpose of describing rather than limiting the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, and may be technically variously interlocked and driven by one of ordinary skill in the art and that each embodiment may be implemented independently of one another, .

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: organic light emitting display
110: bank
180: upper substrate
181: Black Matrix
182R, 182G, 182B: colored layer

Claims (14)

A first substrate on which an array of pixels is arranged; And
And a second substrate having a color layer corresponding to each pixel and a black matrix for distinguishing each pixel on a surface facing the first substrate,
Wherein an interval between the first substrate and the second substrate is configured to prevent light emitted from a specific pixel from leaking to a neighboring pixel. The method according to claim 1,
And a filling layer filling a space between the first substrate and the second substrate. 3. The method of claim 2,
Wherein the filling layer is an epoxy-based or olefin-based material. 3. The method of claim 2,
Wherein the first substrate defines a boundary of the pixels and has a bank corresponding to the black matrix. 5. The method of claim 4,
Wherein the bank has a wider width than the black matrix. 5. The method of claim 4,
Wherein the distance between the first substrate and the second substrate
And a distance between the bank and the black matrix. The method according to claim 6,
Wherein the bank and the black matrix are arranged such that,
Wherein the color of the neighboring pixels is spaced apart by an unrecognized distance at a predetermined viewing angle. 8. The method of claim 7,
Wherein the distance between the bank and the black matrix,
The refractive index of the filling layer, and the refractive index of air outside the OLED display. 9. The method of claim 8,
The distance (Cell Gap) between the bank and the black matrix is determined based on the following equation,

Herein, W _BM is a width of the black matrix, n ₁ is a refractive index of the filling layer, n ₂ is a refractive index of air, and θ ₂ is the predetermined viewing angle. 9. The method of claim 8,
Wherein the viewing angle is 60 DEG or less with respect to a normal direction of the second substrate. 11. The method of claim 10,
The refractive index of the filling layer is 1.55,
Wherein the distance between the bank and the black matrix is 1.48 times or less the width of the black matrix. 3. The method of claim 2,
Further comprising a dam between the first substrate and the second substrate, the dam covering the outer surface of the filling layer. The method according to claim 1,
Wherein the organic light emitting device included in the pixels of the first substrate emits white light in a top emission manner. A color filter substrate including a black matrix;
An array substrate facing the color filter substrate; And
And a filler between the color filter substrate and the array substrate,
Wherein the color filter substrate and the array substrate face each other with a gap determined based on a refractive index of the filler and a line width of the black matrix to minimize color mixing caused by light emitted from adjacent pixels.

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