KR20180046708A - Organic Light Emitting Display Device - Google Patents

Abstract

An organic light emitting display device according to an embodiment of the present invention includes a substrate, a thin film transistor formed on the substrate, a protective layer formed on the thin film transistor, an organic light emitting element formed on the protective layer, a first light blocking pattern formed on the protective layer and partitioning a pixel area of the organic light emitting element, a sealing unit formed on the organic light emitting element and the first light blocking pattern, a touch unit formed on the sealing unit and including a touch electrode, and a second light blocking pattern overlapping with the first light blocking pattern on the touch electrode. The sum of the optical densities of the first light blocking pattern and the second light blocking pattern has a value of at least 4.0 or more, thereby minimizing reflection by the external light of the organic light emitting display device. As a result, external visibility can be improved.

Description

[0001] The present invention relates to an organic light emitting display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting display, and more particularly, to an organic light emitting display capable of improving external visibility by minimizing reflection of external light.

As the era of information age approaches, there is a rapid development of a display device field for visually displaying electrical information signals, and studies for developing performance such as thinning, lightening, and low power consumption for various display devices are continuing.

Typical display devices include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), an electro-wetting device Display device (EWD), and organic light emitting display device (OLED). Among them, the organic light emitting display device is a self light emitting display device, and unlike a liquid crystal display device, a separate light source is not required, so that it can be manufactured in a light and thin shape. In addition, the organic light emitting display device is advantageous not only in terms of power consumption by low voltage driving, but also in terms of color implementation, response speed, viewing angle, and contrast ratio (CR).

An organic light emitting display device is provided with an emission layer (EML) using organic materials between two electrodes made of an anode and a cathode. When holes in the anode are injected into the light emitting layer and electrons in the cathode are injected into the light emitting layer, excited electrons and holes are recombined to form excitons in the light emitting layer.

A host material and a dopant material are included in the light emitting layer of the organic light emitting display, and the interaction of the two materials is utilized. In this case, the host generates excitons from electrons and holes and transfers energy to the dopant. The dopant is a dye organic material to which a small amount of energy is added, and receives energy from the host to convert the light into light.

In the organic light emitting display device including the light emitting layer using the organic material, the organic light emitting display device is encapsulated by using glass, metal, or film, Thereby preventing oxidation of the light emitting layer and the electrodes, and protecting the organic light emitting display device from mechanical or physical impact externally applied thereto.

As a means of inputting the display device, a touch screen panel (TSP), which can input information directly to a screen of a display device by using a finger or a pen in place of a conventional input means such as a mouse or a keyboard, ) Is increasingly used in various fields.

A touch screen panel disposed on the top or inside of the display device converts a touch position directly touching the user's hand or object into an electrical signal and receives the instruction content selected at the touch position as an input signal, .

[White organic light emitting device] (Patent Application No. 10-2007-0053472)

The organic light emitting display includes an organic light emitting device that emits light. In this case, the pixel area of each organic light emitting device is divided and defined through a bank.

The banks included in the conventional OLED display device are formed of polyimide, which is a transparent organic material. However, when using the organic light emitting display device from the outside, external light is reflected from the surface of the metal electrodes disposed under the bank through the transparent bank, thereby lowering the visibility of the organic light emitting display device.

The inventors of the present invention have recognized the above-mentioned problems and invented an organic light emitting display device having a new structure capable of minimizing external light reflection of the organic light emitting display device by improving the banks constituting the organic light emitting display device.

The solutions according to the embodiments 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.

An organic light emitting display according to an embodiment of the present invention includes a substrate, an organic light emitting element on the substrate, a first light blocking pattern for partitioning a pixel region of the organic light emitting element, And a second light blocking pattern on the second electrode and the touch electrode.

An organic light emitting display according to an embodiment of the present invention includes a substrate, an organic light emitting element on the substrate, a first light blocking pattern for partitioning a pixel region of the organic light emitting element, an organic light emitting element, And a second light blocking pattern overlapping the first light blocking pattern on the sealing portion.

An organic light emitting display according to an embodiment of the present invention includes a substrate, a thin film transistor on the substrate, a protective layer on the thin film transistor, an organic light emitting element on the protective layer, A first light blocking pattern for partitioning the first light blocking pattern, an encapsulating portion on the organic light emitting element and the first light blocking pattern, and a sealing portion on the sealing portion, 2 light blocking pattern, and the sum of the optical densities of the first light blocking pattern and the second light blocking pattern has a value of at least 4.0 or more.

The OLED display according to an embodiment of the present invention includes a light blocking pattern including black pigments, so that when external light is used in the organic light emitting display device, external light is reflected from the surface of the metal electrode included in the organic light emitting display device So that the organic light emitting display device with improved external visibility can be provided.

Also, the organic light emitting display according to the embodiment of the present invention can provide an organic light emitting display in which reflection by external light can be minimized by constituting a light blocking pattern having high optical density.

Also, the organic light emitting diode display according to the embodiment of the present invention may form the second light blocking pattern so as to have a high optical density without increasing the thickness of the first light blocking pattern, The defect in the FMM process of the light emitting layer and the difficulty in the process of the first light blocking pattern can be improved.

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

The scope of the claims is not limited by the matters described in the contents of the invention, as the contents of the invention described in the problems, the solutions to the problems and the effects to be solved do not specify essential features of the claims.

1 is a block diagram of an OLED display according to an embodiment of the present invention.
2 is a plan view of an OLED display according to an embodiment of the present invention.
FIG. 3 is a layout diagram of a display substrate and a touch screen panel included in the OLED display according to an exemplary embodiment of the present invention. Referring to FIG.
4 is a circuit diagram of a pixel included in an organic light emitting display according to an embodiment of the present invention.
5 is a cross-sectional view of a pixel included in an OLED display according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with 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.

The first, second, etc. are used to describe various components, but 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.

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, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

1 is a block diagram of an OLED display 100 according to an embodiment of the present invention.

Referring to FIG. 1, an OLED display 100 includes an image processor 110, a timing controller 120, a data driver 130, a gate driver 140, and a display panel 150.

The image processing unit 110 outputs a data enable signal DE together with a data signal DATA supplied from the outside. The image processing unit 110 may output at least one of a vertical synchronization signal, a horizontal synchronization signal, and a clock signal in addition to the data enable signal DE.

The timing controller 120 receives a data enable signal DE or a data signal DATA in addition to a drive signal including a vertical synchronization signal, a horizontal synchronization signal, and a clock signal from the image processing unit 110. The timing controller 120 generates a gate timing control signal GDC for controlling the operation timing of the gate driver 140 and a data timing control signal DDC for controlling the operation timing of the data driver 130 based on the drive signal. .

The data driver 130 samples and latches the data signal DATA supplied from the timing controller 120 in response to the data timing control signal DDC supplied from the timing controller 120 and converts the sampled data signal into a gamma reference voltage . The data driver 130 outputs the data signal DATA through the data lines DL1 to DLn.

The gate driver 140 outputs a gate signal while shifting the level of the gate voltage in response to the gate timing control signal GDC supplied from the timing controller 120. The gate driver 140 outputs the gate signal through the gate lines GL1 to GLm.

The display panel 150 displays an image while the pixel 160 emits light corresponding to the data signal DATA and the gate signal supplied from the data driver 130 and the gate driver 140.

2 is a plan view of an OLED display 200 according to an embodiment of the present invention.

2, the organic light emitting diode display 200 includes an active area (A / A) 210 on which a pixel 240 that emits light through a thin film transistor and an organic light emitting diode is disposed on a substrate 210, And a circuit area (C / A) in which a circuit part connected to the pixel is disposed in an outer part of the display area A / A.

A plurality of pixels 240 and a plurality of data lines 230 transmitting an externally generated data signal to the pixels 240 are formed in a display area A / A of the OLED display 200, A plurality of gate lines 220 are disposed. The detailed structure of the pixel 240 will be described in FIGS. 4 and 5. FIG.

The circuit area C / A of the organic light emitting diode display 200 includes various circuits for transmitting the externally generated signal described in FIG. 1 to the pixel 240 through the plurality of gate lines 220 and the data lines 230 A circuit portion 250 including components associated with the circuitry is disposed.

In order to block the inflow of moisture or oxygen from the outside of the organic light emitting diode display 200 to prevent oxidation of the light emitting layer and the electrode, the sealing part and the user can input information directly to the screen of the display device using a finger or a pen The touch screen panel is disposed on the front surface of the substrate 210. The detailed structure of the sealing portion and the touch screen panel will be described in Fig. 3 and Fig.

3 is a layout diagram of a display substrate 310 and a touch screen panel 360 included in the OLED display 300 according to an embodiment of the present invention.

3, the OLED display 300 includes a display substrate 310 on which the pixels 340 are disposed, an encapsulation unit 350 on the display substrate 310, and a touch screen panel 360 do.

The touch screen panel 360 is disposed on an encapsulation unit 350 for preventing the organic light emitting devices included in the organic light emitting display 300 and the electrodes from being oxidized by interrupting the inflow of moisture or oxygen from the outside. At this time, the touch screen panel 360 detects the contact position of the user's hand or object using the plurality of touch electrodes 370 included in the touch screen panel 360, And detects the presence or absence of a touch and the touch position.

The plurality of touch electrodes 370 are arranged differently according to the self-capacitance method, the mutual capacitance, and the like, which are formed by a touch method.

In general, the touch screen panel 360 is implemented by a capacitance touch method for detecting presence or absence of touch and touch coordinates based on a change in capacitance generated at a contact position of a pointer such as a finger of a user. Such a capacitance touch method can be divided into a mutual capacitance method and a self capacitance method.

In the mutual capacitance touch method, a plurality of touch electrodes 370 are composed of a plurality of horizontal electrodes and a plurality of vertical electrodes, and one of the horizontal electrodes and the vertical electrodes is connected to a driving electrode And the electrode in the other direction becomes the sensing electrode forming the capacitance with the driving electrode, and the presence or absence of the touch and the coordinate can be detected based on the change in the capacitance between the two electrodes.

In the self-capacitance touch method, capacitances are formed between a plurality of touch electrodes 370 and pointers, and capacitance values between the touch electrodes and points according to presence or absence of pointers are measured to detect presence or absence of touch and coordinates.

4 is a circuit diagram of a pixel included in the organic light emitting diode display 400 according to the embodiment of the present invention.

4, a pixel of the OLED display 400 includes a switching transistor 440, a driving transistor 450, a compensation circuit 460, and an organic light emitting diode 470.

The organic light emitting element 470 operates to emit light in accordance with the driving current formed by the driving transistor 450. [

The switching transistor 440 performs a switching operation so that a data signal supplied through the data line 430 corresponding to the gate signal supplied through the gate line 420 is stored as a data voltage in a capacitor.

The driving transistor 450 operates so that a constant driving current flows between the high potential power supply line VDD and the low potential power supply line GND in response to the data voltage stored in the capacitor.

The compensation circuit 460 is a circuit for compensating the threshold voltage and the like of the driving transistor 450, and the compensation circuit 460 is composed of one or more thin film transistors and a capacitor. The configuration of the compensation circuit may vary widely depending on the compensation method.

The pixel of the organic light emitting diode display 400 includes a 2T transistor (Capacitor) structure including a switching transistor 440, a driving transistor 450, a capacitor, and an organic light emitting diode 470. However, 4T2C, 5T2C, 6T2C, 7T2C, and the like in the case where the adder 460 is added.

5 is a cross-sectional view taken along the line I-I 'of the display area A / A shown in FIG. 2 for explaining a pixel included in the organic light emitting diode display according to the embodiment of the present invention.

5, the organic light emitting diode display 500 includes a substrate 510, a thin film transistor 520, an organic light emitting diode 540, and a touch screen panel 560.

The substrate 510 serves to support and protect the components of the OLED display 500 disposed thereon. In recent years, a plastic substrate such as a polyimide having a flexible characteristic is used, and a substrate 510 of various materials is applied to a display device.

The thin film transistor 520 disposed on the substrate 510 includes a gate electrode 522, a source electrode 524, a drain electrode 526 and a semiconductor layer 528.

The semiconductor layer 528 has a higher mobility than amorphous silicon or amorphous silicon and has low energy consumption and excellent reliability. The semiconductor layer 528 can be formed of a polycrystalline silicon ), An oxide semiconductor such as ZnO (Zinc Oxide) or IGZO (Indium-Gallium-Zinc Oxide), which is excellent in mobility and uniformity characteristics, but the present invention is not limited thereto.

The semiconductor layer 528 may include a source region including a p-type or an n-type impurity, a drain region, and a channel between the source region and the drain region, A low concentration doped region may be included between the source region and the drain region.

The gate insulating layer 531 is an insulating film composed of a single layer or a plurality of layers of silicon oxide (SiOx) or silicon nitride (SiNx), and is arranged such that a current flowing in the semiconductor layer 528 does not flow to the gate electrode 522. [

The gate electrode 522 serves as a switch for turning on or turning off the thin film transistor 520 based on an electric signal transmitted from the outside through the gate line, A single layer or an alloy of copper, copper, aluminum, molybdenum, chromium, gold, titanium, nickel, neodymium, But it is not limited thereto.

The source electrode 524 and the drain electrode 526 are connected to the data line so that an electric signal transmitted from the outside is transmitted from the thin film transistor 520 to the organic light emitting diode 540. The source electrode 524 and the drain electrode 526 may be formed of a conductive metal such as copper, aluminum, molybdenum, chromium, gold, titanium, nickel, And neodymium (Nd), or an alloy thereof, but it is not limited thereto.

The interlayer insulating layer 533 is interposed between the gate electrode 522 and the source electrode 524 and between the gate electrode 522 and the drain electrode 522 in order to insulate the gate electrode 522 from the source electrode 524 and the drain electrode 526, 526, respectively.

A passivation layer 535 composed of an inorganic insulating film such as silicon oxide (SiOx) or silicon nitride (SiNx) is disposed on the top of the thin film transistor 520. [ The passivation layer 535 can prevent unnecessary electrical connection between the elements of the thin film transistor 520 and prevent contamination or damage from the outside.

The thin film transistor 520 may be classified into an inverted staggered structure and a coplanar structure depending on the positions of the constituent elements of the thin film transistor 520. In the thin film transistor of the inverted staggered structure, the gate electrode is located on the opposite side of the source electrode and the drain electrode with respect to the semiconductor layer. 5, the thin film transistor 520 of the coplanar structure has the gate electrode 522 located on the same side of the source electrode 524 and the drain electrode 526 as the semiconductor layer 528 as a reference.

Although the thin film transistor 520 of the coplanar structure is shown in FIG. 5, the organic light emitting display may include a thin film transistor having an inverted staggered structure.

Also, for convenience of explanation, only the driving thin film transistor among various thin film transistors that can be included in the organic light emitting display device is shown, but a switching thin film transistor, a capacitor, and the like may be included in the organic light emitting display device.

And protects the thin film transistor 520 and alleviates the level difference caused by the thin film transistor 520 and reduces parasitic capacitance generated between the thin film transistor 520 and the gate line and the data line and between the organic light emitting elements 540 The planarization layer 537 may be disposed on the top of the thin film transistor 520 to reduce parasitic capacitance. At this time, the planarization layer 537 may be formed of organic materials such as polyimide, photo acryl, and benzocyclobutene (BCB).

The organic light emitting device 540 disposed on the planarizing layer 537 includes an anode 542, a light emitting portion 544, and a cathode 546.

The anode 542 may be disposed on the planarization layer 537. The anode 542 serves to supply holes to the light emitting portion 544 and may be electrically connected to the thin film transistor 520 through a contact hole disposed in the planarization layer 537. The anode 542 may be made of indium tin oxide (ITO), indium zinc oxide (IZO) or the like, which is a transparent conductive material, but is not limited thereto.

When the OLED display 500 emits light to the top of the OLED display 500 where the cathode 546 is disposed, the anode 542 emits light emitted from the light emitting unit 544 to the anode 542 So that the cathode 546 can be more smoothly emitted in the upward direction in which the cathode 546 is disposed. Alternatively, the anode 542 may have a two-layer structure in which a transparent conductive layer composed of a transparent conductive material and a reflective layer are sequentially stacked, or a three-layer structure in which a transparent conductive layer, a reflective layer, and a transparent conductive layer are stacked in order, Ag) or an alloy including silver.

The first light blocking pattern 548 disposed on the anode 542 and the planarization layer 537 may be a bank of the organic light emitting display device and may define a pixel along the pixel region can do. In this case, the pixel that emits light in the OLED display 500 may include a sub-pixel that emits one color, and each sub-pixel may emit light of a different color. For example, red light may be emitted in the first pixel, green light may be emitted in the second pixel, and blue light may be emitted in the third sub-pixel. In this way, one pixel can be formed by combining sub-pixels emitting light of different colors.

The material used for the first light blocking pattern 548 is made of a black material capable of minimizing reflection of external light. The formation of the first light blocking pattern 548 by photolithography after forming a photoresist on the anode 542 will be described.

Photoresist refers to a photosensitive resin whose solubility in a developing solution is changed by the action of light, and a specific pattern can be obtained by exposing and developing the photoresist. The photoresist can be classified into a positive photoresist and a negative photoresist. The positive type photoresist refers to a photoresist whose solubility in a developing solution of the exposed portion is increased by exposure. When the positive type photoresist is developed, a pattern in which the exposed portion is removed is obtained. The negative type photoresist is a photoresist which is greatly reduced in the solubility of the exposed portion in a developing solution upon exposure. When the negative type photoresist is developed, a pattern in which the non-exposed portion is removed is obtained.

The photoresist for forming the first light blocking pattern 548 may be formed of a material including a black pigment, which is a black material. The photoresist may be an organic material and may be composed of photosensitive compounds including at least one of a polymer, a monomer, and a photoinitiator.

As to the reaction mechanism, the photoresist before exposure has a form in which black pigment is dispersed in a photosensitive compound. After exposure, the photoinitiator contained in the photosensitive compound generates radicals by light. The monomer has a double bond and reacts with the radical of the photoinitiator to cross-link. As a result, a photoresist having a high molecular weight is formed after exposure, so that the exposed portion is not dissolved by the developer. Then, in the developing step using the developing solution, the portion that is not dissolved by the developing solution becomes the first light blocking pattern 548, and the portion dissolved by the developing solution is removed. The photoresist forming the first light blocking pattern 548 may be referred to as a negative photoresist.

To improve cross-linking after exposure, the photoinitiator may comprise an imine-based material. The immiscible material may be, for example, oxime or oxime ester. Oxime or oxime ester is a long wavelength photoinitiator that can improve cross-linking. The long wavelength here refers to more than 365 nm. The light source used in the exposure is a high-pressure mercury lamp and has a plurality of wavelengths. The multiple wavelengths may be G-line at 436 nm, H-line at 405 nm, and I-line at 365 nm. Among them, the photolithography process is performed using light of 365 nm or more which is the I-line.

Since oxime or oxime ester can minimize the byproducts generated after exposure, the impurities generated by reaction of the byproduct with other molecules in the subsequent baking process after crosslinking can be minimized. Since the oxime or oxime ester is used together with the black pigment, the first light blocking pattern 548 having a high light shielding effect can be provided. Alternatively, the oxime or oxime ester may contain acetophenone as a photoinitiator.

For example, the oxime can be represented by the following formula (1).

Here, R and R 'may be any of an alkyl group having 1 to 15 carbon atoms or a phenyl group.

For example, the oxime ester can be represented by the following formula (2).

Wherein R is an aryl group and R 'may be one of an alkyl group having 1 to 15 carbon atoms or a phenyl group.

The monomer may comprise six functional groups, for example DPHA (DiPentaerythritol HexaAcrylate). This DPHA has a double bond and can be rapidly cured by light after crosslinking. Therefore, the photoresist for forming the first light shielding pattern 548 can be formed as a hard film, and the developing performance is improved, thereby preventing the film from being lost even in a developing process in which the concentration of the developing solution is high.

Polymers include cardo-based. The cadoline-based polymer has excellent heat resistance and compatibility with pigments, and is excellent in solubility. The polymer may further include an epoxy acrylate. Thus, the polymers comprising cadose series and epoxy acrylates serve to improve dispersibility by allowing black pigments to be well dispersed within the polymer. The dispersibility refers to the uniformity of the photoresist, and as the dispersibility is improved, a uniform first light blocking pattern 548 can be formed.

For example, the cardinal series can be represented by the following formula (3).

The developing solution may be, for example, TMAH (TetraMethlymmonium Hydroxide) or KOH (Potassium Hydroxide).

The first light shielding pattern 548 can be formed of a material containing black pigments and a photosensitive compound to constitute a uniform film with improved dispersibility and the developing performance can be improved so that even in a developing process in which the developer concentration is high, The first light blocking pattern 548 can be formed so that the light blocking property is improved and the reflection due to external light can be minimized.

By configuring the first light shielding pattern 548 with a material containing black pigment and a photosensitive compound, reflection by external light is reduced, so that the organic light emitting display 500 having improved reflection brightness can be provided.

When the first light blocking pattern 548 is formed of a material containing black pigments and a photosensitive compound, the reflection brightness at an angle of reflection of 30 degrees when the incident angle of external light is 45 degrees can be lowered to 30 nit or less. Thus, the reflection by external light is suppressed, and the reflection brightness can be reduced. The reflection brightness of the first light blocking pattern 548 can be measured by DMS803. Here, the reflection luminance may include the reflection luminance on the right and left sides of the organic light emitting display device. Therefore, when the left-right reflection luminance is 45 degrees at the incident angle of the external light, the reflection angle may be 30 degrees or less at 30 degrees. Accordingly, the visual sense characteristics in the lateral direction of the OLED display 500 according to the embodiment of the present invention can be improved.

A light emitting portion 544 is disposed between the anode 542 and the cathode 546. The light emitting portion 544 may emit light and may include a hole injection layer, a hole transporting layer, a light emitting layer, an electron transporting layer, an electron injection layer, and the like. Depending on the structure and characteristics of the organic light emitting display device 500, Some parcel elements of portion 544 may be omitted.

The hole injecting layer and the hole transporting layer are disposed between the anode 542 and the light emitting layer to smooth the movement of holes from the anode 542 to the light emitting layer.

The hole injection layer is disposed on the anode 542 and serves to smoothly inject holes. The hole injection layer may be formed by, for example, HAT-CN (dipyrazino [2,3-f: 2 ', 3'-h] quinoxaline-2,3,6,7,10.11-hexacarbonitrile), CuPc NPD (N, N'-bis (naphthalene-1-yl) -N, N'-bis (phenyl) -2,2'-dimethylbenzidine).

The hole transporting layer is disposed on the hole injecting layer and serves to smoothly transfer holes to the light emitting layer. The hole transporting layer may be formed of, for example, NPD (N, N'-bis (naphthalene-1-yl) -N, N'- TAD (2,2 ', 7,7'-tetrakis (N, N-dimethylamino) -9,9-spirofluorene) - (3-methylphenyl) -N, N'- , And MTDATA (4,4 ', 4 "-Tris (N-3-methylphenyl-N-phenylamino) -triphenylamine).

A micro cavity is a structure in which light is repeatedly reflected between two layers separated by an optical length, and light of a specific wavelength is amplified by constructive interference. Since the wavelengths of light are different when the organic light emitting diode display 500 emits different light for each sub-pixel, a resonance distance should be set for each wavelength of light in each sub-pixel in order to realize micro-cavity. In the organic light emitting diode display 500, the thickness of the hole transport layer may be adjusted to differently set the resonance distance for each sub-pixel.

The light emitting layer is disposed on the hole transporting layer and can emit light of a specific color including a substance capable of emitting light of a specific color. At this time, the light emitting material may be formed using a phosphor or a fluorescent material.

A host material comprising CBP (4,4'-bis (carbazol-9-yl) biphenyl) or mCP (1,3-bis (carbazol-9-yl) benzene) , Acetylacetonate iridium, bis (1-phenylisoquinoline) acetylacetonate iridium, PQIr acac bis (1-phenylquinoline) acetylacetonate iridium, PQIr tris (1-phenylquinoline) iridium and PtOEP (octaethylporphyrin platinum A phosphorescent material, and a dopant. Or a fluorescent material containing PBD: Eu (DBM) 3 (Phen) or Perylene.

A phosphorescent material including a dopant material such as Ir complex including a host material including CBP or mCP and containing Ir (ppy) ₃ (tris (2-phenylpyridine) iridium) . Further, it may be made of a fluorescent material containing Alq ₃ (tris (8-hydroxyquinolino) aluminum).

When the light-emitting layer emits blue light, a dopant including a host material including CBP or mCP and containing FIrPic (bis (3,5-difluoro-2- (2-pyridyl) phenyl- (2-carboxypyridyl) iridium) (4,4'-bis (2,2-diphenyl-ethen-1-yl) biphenyl), DSA (1-4-di- [4- (N, N-di-phenyl) amino] styryl-benzene, PFO (polyfluorene) polymer and PPV (polyphenylenevinylene) polymer.

The electron transporting layer and the electron injecting layer are disposed between the light emitting layer and the cathode 546, and smooth the movement of electrons from the cathode 546 to the light emitting layer.

The electron transporting layer is disposed on the light emitting layer and serves to transfer electrons from the electron injecting layer to the light emitting layer. The electron transport layer may be formed of, for example, Liq (8-hydroxyquinolinolato-lithium), PBD (2- (4-biphenyl) -5- (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline) and BAlq (4-biphenyl) (bis (2-methyl-8-quinolinolate) -4- (phenylphenolato) aluminum).

The electron injection layer is an organic layer which is disposed on the electron transporting layer and smoothly injects electrons from the cathode 546. The electron injection layer is BaF2, LiF, NaCl, CsF, Li 2 O , and may be a metallic inorganic compound such as BaO, HAT-CN (dipyrazino [ 2,3-f: 2 ', 3'-h] quinoxaline-2, 3,6,7,10.11-hexacarbonitrile), CuPc (phthalocyanine), and NPD (N, N'-bis (naphthalene- , And the like.

The cathode 546 is disposed on the light emitting portion 544 and serves to supply electrons to the light emitting portion 544. The cathode 546 may be made of a metal material such as magnesium (Mg), silver-magnesium (Ag: Mg) or the like, which is a conductive material having a low work function, but is not limited thereto. Alternatively, when the organic light emitting diode display 500 is a top emission type, the cathode 546 may be formed of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITO), zinc oxide (ZnO), and tin oxide (TiO 2).

The encapsulation unit 550 for preventing the thin film transistor 520 and the organic light emitting diode 540, which are components of the organic light emitting diode display 500, from being oxidized by moisture or oxygen introduced from the outside is formed on the organic light emitting diode 540. .

The sealing portion 550 may be formed by stacking a plurality of sealing layers, a foreign material compensation layer, and a plurality of barrier films.

The sealing layer may be disposed on the upper surface of the thin film transistor 520 and the organic light emitting diode 540 and may be composed of one of silicon nitride (SiNx) and aluminum oxide (AlOz), but is not limited thereto. An encapsulation layer may be further stacked on the foreign material compensation layer disposed on the encapsulation layer.

The foreign material compensation layer is disposed on the sealing layer, and organic materials such as silicon oxy carbon (SiOCz), acrylic or epoxy resin may be used. However, the present invention is not limited thereto. The foreign material compensating layer can be compensated for by such foreign matter or particles that may be generated during the process and may be compensated for by the foreign material compensating layer when the defect is caused by the crack generated by the particles.

A barrier film may be disposed on the sealing layer and the foreign material compensation layer so that the organic light emitting display 500 can further delay the penetration of oxygen and moisture from the outside. The barrier film may be formed of a film having a light-transmitting property and a double-side adhesive property, and may be composed of an insulating material selected from the group consisting of an olefin series, an acrylic series, and a silicon series, or a COP A thermoplastic elastomer, a COC (Cycoolefin Copolymer), and a PC (Polycarbonate) may be further laminated, but the present invention is not limited thereto.

A touch screen 550 that converts a touch position directly touching the user's hand or object on the encapsulation unit 550 into an electrical signal and receives the instruction content selected at the touch position as an input signal, Panel 560 is disposed.

A plurality of touch electrodes 562 may be disposed on the touch screen panel 560 so as to intersect with each other and an adhesive layer 566 may be disposed on the touch electrode 562.

The touch electrode 562 is composed of a plurality of horizontal electrodes and a plurality of vertical electrodes, and one of the horizontal electrodes and the vertical electrodes is a driving electrode to which a touch driving signal is applied, And a sensing electrode for forming a capacitance with the driving electrode. The presence / absence of touch and the coordinate are detected in accordance with a change in capacitance between the two electrodes. At this time, the touch electrode 562 may be made of indium tin oxide (ITO), indium zinc oxide (IZO) or the like, which is a transparent conductive material, but is not limited thereto.

In order to minimize the reflection of external light, the optical density value of the first light blocking pattern 548 must be increased. If the thickness of the first light blocking pattern 548 is increased in order to increase the optical density value of the first light blocking pattern 548, there is a high possibility that a defect occurs due to difficulty in the process. For example, in order to set the optical density value of the first light blocking pattern 548 to 4.0 or more, the thickness of the first light blocking pattern 548 should be 3 μm or more. When the thickness of the first light blocking pattern 548 is thick, there is a problem that the light emitting layer is difficult to be deposited in a desired form in a fine metal mask (FMM) process for forming a light emitting layer. When the thickness of the first light blocking pattern 548 is thick, the light during the photolithography process for forming the first light blocking pattern 548 can not reach the bottom of the first light blocking pattern 548 , The first light blocking pattern 548 is lost in the developing process of the first light blocking pattern 548, and the first light blocking pattern 548 does not have a desired shape.

In order to increase the optical density value of the first light blocking pattern 548, a material having a high optical density value of the first light blocking pattern 548 can be applied. However, if the optical density value of one light-blocking pattern 548 is high, the volume resistivity becomes low, so that defects due to the leakage current occur.

Therefore, in order to improve the optical density, the second light blocking pattern 564 is further disposed on the touch electrode 562 in a region overlapping the first light blocking pattern 548. [

The second light blocking pattern 564 may be formed of a black resin used for a black matrix having a high optical density, but is not limited thereto. The value of the optical density of the black resin may be 2.0 or more.

Alternatively, the second light blocking pattern 564 may be formed of the same black material as the first light blocking pattern 548. Accordingly, the first light blocking pattern 548 or the second light blocking pattern 564 may be formed of a polymer including a cardo-based polymer and an epoxy acrylate. The first light blocking pattern 548 or the second light blocking pattern 564 may further include a monomer containing six functional groups and may further include a photoinitiator including one of oxime and oxime ester .

Since the second light blocking pattern 564 is further formed, the sum of the optical density (OD) of the first light blocking pattern 548 and the second light blocking pattern 564 can minimize the reflection of external light It is possible to minimize the reflection of external light. At this time, since the optical density of the second light blocking pattern 564 can be 3.0 or more, the optical density of the first light blocking pattern 548 can be 1.0 or more. Therefore, the sum of the optical densities of the first light blocking pattern 548 and the second light blocking pattern 564 may be 4.0 or more.

When the optical density of the first light blocking pattern 548 is 1.0 or more, the thickness of the first light blocking pattern 564 may be 2 mu m or less. When the optical density of the second light blocking pattern 564 is 3.0 or more, the thickness of the second light blocking pattern 564 may be 2 mu m or less. Accordingly, the optical density can be improved without increasing the thicknesses of the first light blocking pattern 548 and the second light blocking pattern 564. That is, since the second light blocking pattern 564 is disposed so as to overlap with the first light blocking pattern 548, the thickness of the first light blocking pattern 548 can be maintained at an appropriate level while the sum of optical density is 4.0 or more , It is possible to reduce the defect of the light emitting layer and the defective process of the first light blocking pattern 548 that may occur in the FMM process.

Since the optical density value of the first light intercepting pattern 548 can be 1.0 or more, it is possible to prevent the volume resistivity from being lowered. That is, the higher the volume resistivity, the more the leakage current can be reduced. Therefore, the volume resistivity of the first light intercepting pattern 548 can be set to 1 x 10 ¹⁵ ? · Cm or more. Since the organic layers constituting the light emitting portion 544 are constituted by the common layer, when the current is applied to drive the specific sub-pixel, the leakage current flows through the organic layer such as the hole injection layer or the hole transport layer to the other sub- Flowing phenomenon. This leakage current causes other unintended sub-pixels to emit light, resulting in color mixture between the sub-pixels and lowering the luminance. Therefore, when the volume resistivity is 1 x 10 < ¹⁵ > OMEGA .cm or more, it is possible to prevent the color mixture and the brightness decrease between the sub-pixels due to the leakage current. The volume resistivity can be measured, for example, with an Ultra High Resistance Meter R8340A.

Since the optical density value of the first light blocking pattern 548 can be 1.0 or more, damage to the organic light emitting element due to outgassing can be prevented. The outgassing is effected by a gaseous compound generated by the external light of the organic material of the protective layer on the thin film transistor, such as the hole injection layer included in the organic light emitting element. As a result, holes in the hole injection layer are not supplied to the light emitting layer, thereby damaging the organic light emitting device.

An adhesive layer 566 made of UV curable resin is disposed on the touch electrode 562 and the second light shielding pattern 564 and a cover substrate 570 made of glass or a film is disposed on the touch screen panel 560, And may be adhered to the adhesive layer 566 included in the panel 560.

An organic light emitting display according to an embodiment of the present invention includes a substrate, an organic light emitting element on the substrate, a first light blocking pattern for partitioning a pixel region of the organic light emitting element, And a second light blocking pattern on the second electrode and the touch electrode.

The substrate of the OLED display according to the embodiment of the present invention may be a flexible substrate.

The sum of the optical densities of the first light blocking pattern and the second light blocking pattern may have a value of at least 4.0 or more.

In the organic light emitting diode display according to the embodiment of the present invention, the optical density of the first light blocking pattern may have a value of at least 1.0.

The optical density of the second light blocking pattern may have a value of at least 3.0 or more.

In the organic light emitting diode display according to the embodiment of the present invention, the second light blocking pattern may overlap the first light blocking pattern.

An organic light emitting display according to an embodiment of the present invention includes a substrate, an organic light emitting element on the substrate, a first light blocking pattern for partitioning a pixel region of the organic light emitting element, an organic light emitting element, And a second light blocking pattern overlapping the first light blocking pattern on the sealing portion.

The substrate of the OLED display according to the embodiment of the present invention may be a flexible substrate.

The sum of the optical densities of the first light blocking pattern and the second light blocking pattern may have a value of at least 4.0 or more.

In the organic light emitting diode display according to the embodiment of the present invention, the optical density of the first light blocking pattern may have a value of at least 1.0.

The optical density of the second light blocking pattern may have a value of at least 3.0 or more.

In the organic light emitting display according to an embodiment of the present invention, the first light blocking pattern or the second light blocking pattern may be formed of a polymer including a cardo-based polymer and an epoxy acrylate.

The organic light emitting display according to an embodiment of the present invention may further include a monomer including 6 functional groups in the first light blocking pattern or the second light blocking pattern.

The organic light emitting diode display according to an embodiment of the present invention may further include a photo initiator including one of oxime and oxime ester.

The second light blocking pattern of the OLED display according to the exemplary embodiment of the present invention may be on the touch electrode.

An organic light emitting display according to an embodiment of the present invention includes a substrate, a thin film transistor on the substrate, a protective layer on the thin film transistor, an organic light emitting element on the protective layer, A first light blocking pattern for partitioning the first light blocking pattern, an encapsulating portion on the organic light emitting element and the first light blocking pattern, and a sealing portion on the sealing portion, 2 light blocking pattern, and the sum of the optical densities of the first light blocking pattern and the second light blocking pattern has a value of at least 4.0 or more.

The substrate of the OLED display according to the embodiment of the present invention may be a flexible substrate.

The first light blocking pattern or the second light blocking pattern of the OLED display according to the exemplary embodiment of the present invention may be formed of a polymer including a cardo-based polymer and an epoxy acrylate.

The first light blocking pattern or the second light blocking pattern of the OLED display according to the exemplary embodiment of the present invention may further include a monomer including six functional groups.

The first light-shielding pattern or the second light-shielding pattern of the organic light emitting diode display according to the embodiment of the present invention may further include a photoinitiator including one of oxime and oxime ester.

Although 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 changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100, 200, 300, 400, 500: organic light emitting display
110:
120: Timing controller
130: Data driver
140: gate driver
150: Display panel
160, 240, 340: pixel
210, 510: substrate
220, 420: gate line
230, and 430: a data line
250:
310: Display substrate
350, 550:
360, 560: touch screen panel
370, 562: touch electrode
440: switching transistor
450: driving transistor
460: Compensation circuit
470, 540: organic light emitting device
520: Thin film transistor
522: gate electrode
524: source electrode
526: drain electrode
528: semiconductor layer
531: Gate insulating layer
533: Interlayer insulating layer
535: Passivation layer
537: Planarizing layer
542: anode
544:
546: Cathode
548: first light blocking pattern
564: second light blocking pattern
570: Cover substrate
A / A: display area
C / A: Circuit area

Claims (20)

Board;
An organic light emitting element on the substrate;
A first light blocking pattern for partitioning a pixel region of the organic light emitting device;
A touch unit on the organic light emitting diode, the touch unit including a touch electrode; And
And a second light blocking pattern on the touch electrode. The OLED display according to claim 1, wherein the substrate is a flexible substrate. The OLED display according to claim 1, wherein the sum of optical densities of the first light blocking pattern and the second light blocking pattern is at least 4.0 or more. The organic light emitting display according to claim 3, wherein the optical density of the first light blocking pattern has a value of at least 1.0. The organic light emitting display according to claim 3, wherein the optical density of the second light shielding pattern has a value of at least 3.0 or more. The organic light emitting display according to claim 1, wherein the second light blocking pattern overlaps with the first light blocking pattern. Board;
An organic light emitting element on the substrate;
A first light blocking pattern for partitioning a pixel region of the organic light emitting device;
An encapsulant on the organic light emitting device and the first light blocking pattern;
And a second light blocking pattern overlapping the first light blocking pattern on the sealing portion. 8. The organic light emitting display according to claim 7, wherein the substrate is a flexible substrate. The organic light emitting display according to claim 7, wherein the sum of the optical densities of the first light blocking pattern and the second light blocking pattern is at least 4.0 or more. The organic light emitting display according to claim 9, wherein the optical density of the first light blocking pattern has a value of at least 1.0. The organic light emitting display according to claim 9, wherein the optical density of the second light blocking pattern has a value of at least 3.0 or more. 8. The organic light emitting diode display of claim 7, wherein the first light blocking pattern or the second light blocking pattern is formed of a polymer including a cardo-based polymer and an epoxy acrylate. The OLED display of claim 7, wherein the first or second light shielding pattern further comprises a monomer having six functional groups. 8. The OLED display of claim 7, wherein the first light-blocking pattern or the second light-blocking pattern further comprises a photoinitiator comprising one of oxime and oxime ester. The organic light emitting display according to claim 7, wherein the second light shielding pattern is on the touch electrode. Board;
A thin film transistor on the substrate;
A protective layer on the thin film transistor;
An organic light emitting element on the protective layer;
A first light blocking pattern on the protective layer and partitioning a pixel region of the organic light emitting device;
An encapsulant on the organic light emitting device and the first light blocking pattern;
A touch portion on the sealing portion, the touch portion including a touch electrode; And
And a second light blocking pattern overlapping the first light blocking pattern on the touch electrode,
Wherein the sum of optical densities of the first light blocking pattern and the second light blocking pattern has a value of at least 4.0 or more. The organic light emitting display according to claim 16, wherein the substrate is a flexible substrate. 17. The OLED display of claim 16, wherein the first light-blocking pattern or the second light-blocking pattern is formed of a polymer including a cardo-based polymer and an epoxy acrylate. 17. The OLED display of claim 16, wherein the first light-blocking pattern or the second light-blocking pattern further comprises a monomer including six functional groups. 17. The OLED display of claim 16, wherein the first or second light shielding pattern further comprises a photoinitiator comprising one of oxime and oxime ester.

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