KR102571631B1 - Organic light emitting display device - Google Patents

Abstract

An organic light emitting display device according to an embodiment of the present invention includes an organic light emitting element emitting monochromatic light on a first substrate, a protective layer on the organic light emitting element, a filler on the protective layer, and a second substrate including a color filter layer on the filler and protection. It is characterized by being an organic light emitting display device including a plurality of color conversion materials disposed between the layer and the color filter layer and emitting light of two colors different from the monochromatic light emitted by the organic light emitting element.

Description

Organic light emitting display device {ORGANIC LIGHT EMITTING DISPLAY DEVICE}

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device capable of reducing types of organic materials applied to an organic light emitting device and improving efficiency and color reproducibility.

An organic light emitting display (OLED) is a self-emissive display device, and unlike a liquid crystal display (LCD), it does not require a separate light source and can be manufactured to be lightweight and thin. In addition, the organic light emitting display device is advantageous in terms of power consumption due to low voltage driving, and is being studied as a next-generation display because it is excellent in color implementation, response speed, viewing angle, and contrast ratio (CR).

An organic light emitting display device displays an image using light emitted from an organic light emitting element connected to a thin film transistor in each pixel area. An organic light emitting device includes an organic light emitting layer made of organic material between an anode and a cathode and emits light by applying an electric field. It can be driven at a low voltage, consumes relatively little power, is light and flexible flexible) It has a feature that can be manufactured even on the top of the board.

In order to implement a full white color in an organic light emitting display device, a three-color light source consisting of red (R), green (G), and blue (B) is required.

As a method of realizing the three-color light source as described above, a method of forming red (R), green (G), and blue (B) organic light emitting layers in each sub-pixel so that each sub-pixel emits light independently or a plurality of A multi-stack is formed through the stacking of organic light emitting layers to form a white organic light emitting device (White OLED), and color filters of red (R), green (G), and blue (B) are formed on top of it. ) is widely used.

Among them, in the method using a white OLED and a color filter, in order to implement a full white organic light emitting device, a blue light emitting layer is used in the first light emitting layer and yellow is used in the second light emitting layer. - It is necessary to use an organic light emitting device having a multi-stack organic light emitting layer of at least two colors such as a yellow-green light emitting layer.

However, when an organic material having a wide spectrum such as yellow-green is used, it is difficult to implement high efficiency and high color gamut in an organic light emitting device.

In addition, in this method, many types of organic materials must be applied to the multi-stack organic light emitting layer, and accordingly, management of organic materials and organic light emitting device characteristics is difficult, and the material cost of organic materials is greatly increased. there is.

An object to be solved by the present invention is to provide an organic light emitting display capable of improving efficiency and color reproducibility of the organic light emitting display.

Another problem to be solved by the present invention is to provide an organic light emitting display device in which the organic material and characteristics of the organic light emitting device can be easily managed by reducing the types of organic materials applied to the organic light emitting device of the organic light emitting display device.

Solved problems according to embodiments of the present invention are not limited to the above-mentioned problems, and other problems not mentioned above will be clearly understood by those skilled in the art from the description below.

According to the organic light emitting display device according to the exemplary embodiment of the present invention, the organic light emitting display device capable of reducing the types of organic materials applied to the organic light emitting element and improving the efficiency and color reproduction rate of the organic light emitting display device is provided.

An organic light emitting display device according to an embodiment of the present invention includes an organic light emitting element emitting monochromatic light on a first substrate, a protective layer on the organic light emitting element, a filler on the protective layer, and a second substrate including a color filter layer on the filler and protection. and a plurality of color conversion materials disposed between the layer and the color filter layer and emitting light of two colors different from the monochromatic light emitted by the organic light emitting device.

A plurality of color conversion materials may be included in the filler.

The organic light emitting device may emit light of any one color among red, green, and blue.

The plurality of color conversion materials include at least two of a first color conversion material, a second color conversion material, and a third color conversion material, and the first color conversion material, the second color conversion material, and the third color conversion material are respectively It may be made of an organic semiconductor material.

The organic light emitting device may emit blue light, the first color conversion material may receive blue light and emit red light, and the second color conversion material may receive blue light and emit green light.

The first color conversion material is DCM (4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran), DCM2 (4-(dicyanomethylene)-2-methyl-6-(juloidin-4- yl-vinyl)-4H-pyran), DCJTB(4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljuloidyl-9-ehyl)-4H-pyran), DCDDC(3 -(dicyanomethylene)-5,5-dimethyl-1-[(4-dimethylamino)styryl]cyclohexene), AAAP(6-methyl-3-{3-(1,1,6,6-tetramethyl-10-oxo- 2,3,5,6-tetrahydro-1H,4H,10H-11-oxa-3a-azabenz

It consists of any one of o [de] anthracence-9-yl) acryloyl} pyran-2,4-dione) and BSN (1,1'-dicyano-substituted bis-stylnaphthalene), and the second color conversion material is Alq3 (tris (8-quinolinolato)aluminum ()), C-545T(10-(2-bezothianzolyl)-1,1,7,7-tetramethyl-2,3,6,7-tetradro-H,5H,11H-[1 ]benzo-pyrano[6,7,8-ij]quinolizin-11-one), quinacridone derivatives, and carbazole derivatives.

The organic light emitting device may emit green light, the third color conversion material may receive green light and emit blue light, and the first color conversion material may receive green light and emit red light.

The third color conversion material is Perylene, DPVBi (4,4'--bis (2,2'-diphenylvinyl) -1,1'-bipheny), DPVBi (4,4'--bis (2, 2'-diphenylvinyl)-1,1'-biphenyl)-based compound, BFA-IT (2,5-bis{4-[bis-(9,9-dimethyl-2-fluorenyl) amino]phenyl}thiophene), TBSA (9,10-bis[(2", 7"-t-butyl)-9',9"-spirobifluorenyl]anthracene), and the first color conversion material is DCM (4-(dicyanomethylene)-2 -methyl-6-(4-dimethylaminostyryl)-4H-pyran), DCM2(4-(dicyanomethylene)-2-methyl-6-(juloidin-4-yl-vinyl)-4H-pyran), DCJTB(4-( dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljuloidyl-9-ehyl)-4H-pyran), DCDDC(3-(dicyanomethylene)-5,5-dimethyl-1-[( 4-dimethylamino)styryl]cyclohexene), AAAP(6-methyl-3-{3-(1,1,6,6-tetramethyl-10-oxo-2,3,5,6-tetrahydro-1H,4H,10H -11-oxa-3a-azabenzo[de]anthracence-9-yl)acryloyl}pyran-2,4-dione) and BSN (1,1'-dicyano-substituted bis-stylnaphthalene).

The organic light emitting device may emit red light, the second color conversion material may receive red light and emit green light, and the third color conversion material may receive red light and emit blue light.

The second color conversion material is Alq3 (tris(8-quinolinolato)aluminum ()), C-545T (10-(2-bezothianzolyl)-1,1,7,7-tetramethyl-2,3,6,7-tetradro -H, 5H, 11H- [1] benzo-pyrano [6,7,8-ij] quinolizin-11-one), quinacridone derivatives, carbazole derivatives consisting of any one, 3 color conversion materials are perylene, DPVBi (4,4'--bis (2,2'-diphenylvinyl) -1,1'-bipheny), DPVBi (4,4'--bis (2,2 '-diphenylvinyl)-1,1'-biphenyl)-based compound, BFA-IT (2,5-bis{4-[bis-(9,9-dimethyl-2-fluorenyl) amino]phenyl}thiophene), TBSA ( 9,10-bis[(2", 7"-t-butyl)-9',9"-spirobifluorenyl]anthracene).

The organic light emitting display device may further include an overcoat layer disposed on the color filter layer, and the overcoat layer may include a plurality of color conversion materials.

The filler may be made of a transparent filler.

Each of the plurality of color conversion materials may be formed of a material in which an inorganic semiconductor material is doped with a rare earth metal.

Each of the plurality of color conversion materials may be made of quantum dots.

The second substrate may include red, green, blue, and white sub-pixel regions.

In another aspect, an organic light emitting display device of an upper emission type including a color filter according to an embodiment of the present invention includes a plurality of monochromatic light emitted from an organic light emitting element and a plurality of upper portions of the organic light emitting element receiving the monochromatic light. A conventional multi-stack organic light emitting display device by mixing the monochromatic light emitted through photo-luminescence by two color conversion materials and light of a different color to realize white light. An organic light emitting display device with improved contrast efficiency and color gamut.

The plurality of color conversion materials may be formed of at least one selected from inorganic semiconductor materials, organic semiconductor materials, and quantum dots.

The organic light emitting display device may further include a filler disposed on the organic light emitting element, and a plurality of color conversion materials may be included in the filler.

The organic light emitting diode display may further include an overcoat layer disposed on the color filter, and a plurality of color conversion materials may be included in the overcoat layer.

The overcoat layer may be disposed on a sub-pixel region corresponding to a color different from that of monochromatic light emitted from the organic light emitting device.

According to the present invention, monochromatic light emitted from an organic light emitting element of an organic light emitting display device and a plurality of color conversion materials formed on top of the organic light emitting element meet the monochromatic light from the organic light emitting element through photo-luminescence. Efficiency and color reproducibility may be improved compared to an organic light emitting diode display having a conventional multi-stack organic light emitting element structure by mixing emitted light with each other to produce white light.

In addition, the present invention can reduce the material cost by reducing the types of organic materials applied to the organic light emitting element of the organic light emitting display device, and compared to the conventional organic light emitting display device having a multi-stack organic light emitting element structure, organic materials and organic It is easy to manage the characteristics of the light emitting device.

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

Since the content of the invention described in the problem to be solved, the means for solving the problem, and the effect above does not specify the essential features of the claim, the scope of the claim is not limited by the matters described in the content of the invention.

1 is a diagram illustrating a cross-sectional structure of an organic light emitting display device according to an exemplary embodiment of the present invention.
2 is a diagram illustrating a cross-sectional structure of an organic light emitting display device according to another exemplary embodiment of the present invention.
3 is a diagram illustrating a cross-sectional structure of an organic light emitting display device according to another exemplary embodiment of the present invention.
4 is a diagram illustrating a cross-sectional structure of an organic light emitting display device according to another exemplary embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be embodied in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative, so the present invention is not limited to the details shown. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range. In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

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

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each embodiment can be implemented independently of each other or can be implemented together in a related relationship. may be

Hereinafter, an organic light emitting display device according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a cross-sectional structure of an organic light emitting display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1 , an organic light emitting display device 100 according to an exemplary embodiment of the present invention includes a first substrate 110, a thin film transistor 120 disposed on the first substrate 110, and a first substrate 110. A blue organic light emitting element 130 positioned between an electrode (anode) and a second electrode (cathode) and including a blue emission layer, a passivation layer positioned on the blue organic light emitting element 130, 140), a filler 150 positioned on the protective layer 140, and a second substrate 180 positioned on the filler 150 and having a color filter layer 170.

In addition, the organic light emitting diode display 100 according to an embodiment of the present invention includes a dam 140 for bonding the first substrate 110 and the second substrate 180 opposite to the first substrate 110, and the first substrate An organic light emitting display device employing a method of encapsulating the blue organic light emitting diode 130 through the filler 150 disposed inside the dam 140 between the dam 110 and the second substrate 180.

In addition, in the case of the organic light emitting display device 100 according to the exemplary embodiment of the present invention, the first color conversion material 160 and the second color conversion material 165 are interposed between the protective layer 140 and the color filter layer 170. can be configured to include

More specifically, referring to FIG. 1 , in the case of the organic light emitting display device 100 according to an exemplary embodiment of the present invention, the blue organic light emitting device 130 emits two colors of light different from the blue monochromatic light. The first color conversion material 160 and the second color conversion material 165 capable of emitting light are in the form of a compound in the filler 150 positioned between the protective layer 140 and the color filter layer 170. are mixed and placed.

In the organic light emitting display device 100 according to an exemplary embodiment of the present invention, the first substrate 110 includes not only a glass substrate but also polyethylen terephthalate (PET), polyethylen naphthalate (PEN), polyimide, and the like. It may be made of a plastic substrate or the like.

A buffer layer may be provided on the first substrate 110 to block penetration of impurity elements. The buffer layer may be formed of, for example, a single-layer or multi-layer structure of silicon nitride (SiNx) or silicon oxide (SiOx).

In the organic light emitting diode display 100 according to an exemplary embodiment of the present invention, the thin film transistor 120 formed on the first substrate 110 includes a gate electrode, a gate insulating layer, a semiconductor layer, a source electrode, and a drain electrode. can be configured. In addition, the organic light emitting display device 100 may further include a passivation layer and a planarization layer positioned on the thin film transistor 120 .

More specifically, the gate electrode of the thin film transistor 120 serves to transmit a gate signal to the thin film transistor array. The gate electrode is made of at least one metal or alloy of Al, Pt, Pd, Ag, Mg, Au, Ni, Nd, Ir, Cr, Li, Ca, Mo, Ti, W, and Cu, and is formed as a single layer or a plurality of layers. can be formed The gate insulating layer may be made of an inorganic insulating material such as silicon oxide (SiOx) or silicon nitride (SiNx).

In addition, the semiconductor layer may be made of any one of metal oxides, for example, IGZO (Indium Gallium Zinc Oxide), ZTO (Zinc Tin Oxide), and ZIO (Zinc Indium Oxide), but is not limited thereto, and amorphous silicon (Amorphous silicon). ) or polysilicon.

In addition, the source electrode and the drain electrode electrically connected to the semiconductor layer may be formed of a high melting point metal such as chromium (Cr) or tantalum (Ta).

The protective layer or the planarization layer may be formed of an organic or inorganic film having a hydrophobic property, and for example, polystyrene, siloxane series resin, acrylic resin, SiON, silicon nitride ( SiNx), silicon oxide (SiOx), and aluminum oxide (AlOx).

Referring to FIG. 1 , in the organic light emitting diode display 100 according to an exemplary embodiment of the present invention, the blue organic light emitting diode 130 is configured to be connected to the thin film transistor 120 below, and the first electrode (anode) ), a second electrode (cathode), and a multi-layered organic material layer positioned between the first electrode (anode) and the second electrode (cathode).

In addition, the blue organic light emitting element 130 includes a first electrode, a bank exposing a part of the first electrode by overlapping the first electrode and an edge, a multi-layered organic material layer including a blue light emitting layer positioned on the exposed first electrode, and a blue light emitting layer. It includes a light emitting layer, a multi-layered organic material layer, and a second electrode formed to cover the entire surface of the bank.

More specifically, the first electrode disposed on the protective layer or the planarization layer of the thin film transistor 120 has a relatively large work function value to serve as an anode (anode), and is made of a transparent conductive material such as indium tin oxide (ITO). ) or a metal oxide such as indium zinc oxide (IZO), a mixture of metal and oxide such as ZnO:Al or SnO2:Sb, carbon nanotubes, graphene, and silver nanowires.

In addition, when the organic light emitting display device is a top emission type, a metal material having excellent reflective efficiency, such as aluminum (Al) or silver, is placed above or below the first electrode 322 to improve reflective efficiency. A reflective electrode such as (Ag) may be additionally formed as an auxiliary electrode.

In describing an embodiment of the present invention, the top emission method means a method in which light emitted from the organic light emitting layer is emitted in the direction of the second substrate 180, and the bottom emission method refers to a method in which light emitted from the organic light emitting layer is emitted in the direction of the second substrate 180. This refers to a method in which light is emitted in a direction opposite to the first substrate 110 .

The bank defines a light emitting area of the organic light emitting display device. The bank is an organic material having hydrophobicity, for example, polystyrene (Polystylene), polymethylmethacrylate (PMMA), benzocyclobuteneseries resin, siloxane series resin and silane resin. ), acrylic resin, etc.

The organic material layer may be composed of a plurality of multilayers, for example, a hole injection layer, a hole transporting layer, a blue emission layer between the first electrode and the second electrode, It may include an electron transporting layer and an electron injection layer.

The blue emission layer of the blue organic light emitting device 130 may include a light emitting material that emits blue light, and the light emitting material may be formed using a phosphorescent material or a fluorescent material.

More specifically, the blue emission layer may include a host material including CBP or mCP, and may include a phosphorescent material including a dopant material including (4,6-F2ppy)2Irpic. In addition, the blue emission layer includes any one selected from the group consisting of spiro-DPVBi, spiro-6P, distylbenzene (DSB), distryl arylene (DSA), PFO-based polymers and PPV-based polymers. It may be made of a fluorescent material, but is not limited thereto.

The second electrode may be a cathode (negative electrode) and is made of a material having a relatively low work function value. For example, when the organic light emitting display device is a bottom emission type, the second electrode is a metal having a high reflectance and is an alloy composed of a first metal such as Ag and a second metal such as Mg at a certain ratio. It may consist of a single layer or a plurality of layers thereof. Also, a capping layer for improving light efficiency may be additionally formed on the second electrode.

In addition, a passivation layer 140 is formed on the second electrode of the blue organic light emitting element 130 . The protective layer 140 is located on the blue organic light emitting element 130 and is formed to completely cover the blue organic light emitting element 130, so that external moisture (H ₂ 0) or oxygen (O ₂ ) can be removed from the blue light emitting layer, including the blue light emitting layer. It may perform a function of protecting the organic material layer and internal elements.

In addition, the protective layer 140 may be formed by a physical vapor deposition process such as sputtering or thermal deposition or a chemical vapor deposition process.

In addition, the organic light emitting display device 100 according to an embodiment of the present invention is positioned to face the first substrate 110 and is positioned on the organic light emitting element 130 and the protective layer 140 to serve as an encapsulation. It is configured to include a second substrate 180 . The second substrate 180 is bonded to the first substrate 110 on which the blue organic light emitting diode 130 is disposed through the dam 190 and the filler 150 .

That is, referring to FIG. 1 , the organic light emitting diode display 100 according to an exemplary embodiment of the present invention is positioned between the first substrate 110 and the second substrate 180, and the blue organic light emitting element 130 in the display area It may include a filler 150 formed to cover the entire surface of.

The filler 150 is a material that can fill between the first substrate 110 and the second substrate 180, and can transmit light and may be made of a transparent epoxy material, but is not limited thereto. The filler 150 serves to protect organic materials in the blue organic light emitting device 130 . The filler 150 may be applied in a liquid form to the inside of the dam 190 through a process such as inkjet, slit coating, or screen printing.

Referring to FIG. 1 , the organic light emitting display device 100 according to an exemplary embodiment of the present invention is disposed to surround the outer portion of the filler 150, that is, the filler 150, so that moisture or oxygen is emitted from the organic light emitting device from the side. It is configured to include a dam 190 that can minimize penetration into.

The dam 190 serves to adhere the first substrate 110 and the second substrate 180 and may be made of an epoxy material including a getter component capable of adsorbing moisture, but is not limited thereto. . The dam 190 protects the blue organic light emitting element 130 by bonding the first substrate 110 and the second substrate 180 together and preventing the inflow of external moisture or oxygen into the organic light emitting display device 100. It may play a role of securing and preserving the life of the organic light emitting display device 100 .

Referring to FIG. 1 , in the case of the top emission type organic light emitting display device 100 according to an embodiment of the present invention in which light is emitted in an upper direction of the first substrate 110, the second substrate 180 A color filter layer 170 is formed.

More specifically, referring to FIG. 1 , the second substrate 180 has red (R), green (G), blue (B), and white (W) sub-pixel regions defined by a black matrix (BM, 175). It can be configured to include. That is, the red (R) sub-pixel area may include the red color filter 171, the green (G) sub-pixel area may include the green color filter 172, and the blue (B) sub-pixel area may include the blue color filter 173. In the case of the white (W) sub-pixel area 174, it may be configured not to include a color filter.

Referring to FIG. 1 , in the case of the organic light emitting diode display 100 according to an exemplary embodiment of the present invention, the blue organic light emitting element 130 between the protective layer 140 and the color filter layer 170 emits blue light. It includes a first color conversion material 160 and a second color conversion material 165 capable of emitting light of two colors different from the monochromatic light of .

More specifically, referring to FIG. 1 , in the case of the organic light emitting display device 100 according to an exemplary embodiment of the present invention, the first color conversion material 160 and the second color conversion material 165 are first organic semiconductors, respectively. can be made of material. The first color conversion material 160 and the second color conversion material 165 may be mixed and disposed in the form of a compound in the filler 150 positioned between the protective layer 140 and the color filter layer 170. there is.

In the organic light emitting diode display device 100 according to an exemplary embodiment of the present invention, the first color conversion material 160 receives blue (B) monochromatic light emitted from the blue organic light emitting element 130 positioned below, Red (R) light can be emitted through photo-luminescence, and the second color conversion material 165 is a blue (B) monochromatic light emitted by the blue organic light emitting element 130 positioned below. It can receive light and emit green (G) light through photo-luminescence.

More specifically, the first color conversion material 160 is DCM (4- (dicyanomethylene) -2-methyl-6- (4-dimethylaminostyryl) -4H-pyran), DCM2 (4- (dicyanomethylene) -2-methyl- 6-(juloidin-4-yl-vinyl)-4H-pyran), DCJTB(4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljuloidyl-9-ehyl)-4H -pyran), DCDDC(3-(dicyanomethylene)-5,5-dimethyl-1-[(4-dimethylamino)styryl]cyclohexene), AAAP(6-methyl-3-{3-(1,1,6,6 -tetramethyl-10-oxo-2,3,5,6-tetrahydro-1H,4H,10H-11-oxa-3a-azabenzo[de]anthracence-9-yl)acryloyl}pyran-2,4-dione), It may consist of any one of BSN (1,1'-dicyano-substituted bis-stylnaphthalene), but is not limited thereto.

In addition, the second color conversion material 165 is Alq3 (tris (8-quinolinolato) aluminum ()), C-545T (10- (2-bezothianzolyl) -1,1,7,7-tetramethyl-2,3, Any of 6,7-tetradro-H,5H,11H-[1]benzo-pyrano[6,7,8-ij]quinolizin-11-one), quinacridone derivatives, and carbazole derivatives It may consist of one, but is not limited thereto.

Also, the first color conversion material 160 and the second color conversion material 165 may be formed of a material in which an inorganic semiconductor material is doped with a rare earth metal. More specifically, the first color conversion material 160 may be formed of GaN:Eu in which gallium nitride (GaN) is doped with europium (Eu), and the second color conversion material 165 may be formed of gallium nitride (GaN) It may be made of GaN:Er doped with erbium (Er).

In addition, the first color conversion material 160 and the second color conversion material 165 may be made of quantum dots that change the color of emitted light according to their sizes.

That is, in the case of the organic light emitting display device 100 according to an exemplary embodiment of the present invention, blue (B) light emitted from the blue organic light emitting element 130 and red light (R) emitted through the first color conversion material 160 ) light and the green (G) light emitted through the second color conversion material 165 are mixed to produce white (W) light, and the white (W) light is provided on the second substrate 180. Full color can be implemented while passing through the color filter layer 170.

That is, in the case of the organic light emitting display device 100 according to an exemplary embodiment of the present invention, the blue organic light emitting element 130 emitting monochromatic light, the first color conversion material 160 and the second color conversion material 165 By implementing white light through the , efficiency and color gamut can be improved compared to an organic light emitting display having a conventional multi-stack organic light emitting device structure.

In addition, in the case of the organic light emitting display device 100 according to an embodiment of the present invention, by reducing the types of organic materials applied to the organic light emitting device of the organic light emitting display device, it is possible to reduce the material cost of the organic material and the organic light emitting device. Through the simplification of the structure of the organic material and the characteristics of the organic light emitting device can be easily managed.

2 is a diagram illustrating a cross-sectional structure of an organic light emitting display device according to another exemplary embodiment of the present invention.

In describing the organic light emitting diode display according to another exemplary embodiment of the present invention, repeated detailed descriptions of the same or corresponding elements described above will be omitted.

Referring to FIG. 2 , an organic light emitting diode display 200 according to another embodiment of the present invention includes a first substrate 110, a thin film transistor 120 disposed on the first substrate 110, and a second substrate 110. A green organic light emitting element 230 positioned between the first electrode (anode) and the second electrode (cathode) and including a green emission layer, and a passivation layer positioned on the green organic light emitting element 230 , 140), a filler 150 positioned on the protective layer 140, and a second substrate 180 positioned on the filler 150 and having a color filter layer 170.

In addition, the organic light emitting display device 200 according to another embodiment of the present invention includes a dam 140 for bonding the first substrate 110 and the second substrate 180 opposite to the first substrate 110 and the first substrate 110 . An organic light emitting display device employing a method of encapsulating the green organic light emitting element 230 through the filler 150 disposed inside the dam 140 between the substrate 110 and the second substrate 180.

A green emission layer included in the green organic light emitting element 230 of the organic light emitting display device 200 according to another embodiment of the present invention may include a light emitting material that emits green light, and the light emitting material is phosphorescent. It may be formed using a material or a fluorescent material.

The green emission layer of the green organic light emitting device 230 may include a host material including CBP or mCP, and an iridium complex including Ir(ppy) ₃ (fac tris(2-phenylpyridine)iridium). It may be made of a phosphorescent material including a dopant material such as (Ir complex), or alternatively, it may be made of a fluorescent material including Alq ₃ (tris(8-hydroxyquinolino)aluminum), but is not limited thereto.

In addition, in the case of the organic light emitting display device 200 according to another embodiment of the present invention, the first color conversion material 160 and the third color conversion material 265 are formed between the protective layer 140 and the color filter layer 170. It can be configured including.

More specifically, referring to FIG. 2 , in the case of the organic light emitting display device 200 according to another embodiment of the present invention, the green organic light emitting element 230 emits two different colors of green light. The first color conversion material 160 and the third color conversion material 265 capable of emitting light are a mixture in the filler 150 positioned between the protective layer 140 and the color filter layer 170. Mixed and placed in shape.

In the organic light emitting display device 200 according to another exemplary embodiment of the present invention, the first color conversion material 160 receives green (G) monochromatic light emitted from the green organic light emitting element 230 positioned below it. It is possible to emit red (R) light through photo-luminescence, and the third color conversion material 265 emits green (G) light emitted from the green organic light emitting element 230 positioned below. It can receive monochromatic light and emit blue (B) light through photo-luminescence.

More specifically, the first color conversion material 160 is DCM (4- (dicyanomethylene) -2-methyl-6- (4-dimethylaminostyryl) -4H-pyran), DCM2 (4- (dicyanomethylene) -2-methyl- 6-(juloidin-4-yl-vinyl)-4H-pyran), DCJTB(4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljuloidyl-9-ehyl)-4H -pyran), DCDDC(3-(dicyanomethylene)-5,5-dimethyl-1-[(4-dimethylamino)styryl]cyclohexene), AAAP(6-methyl-3-{3-(1,1,6,6 -tetramethyl-10-oxo-2,3,5,6-tetrahydro-1H,4H,10H-11-oxa-3a-azabenzo[de]anthracence-9-yl)acryloyl}pyran-2,4-dione), It may consist of any one of BSN (1,1'-dicyano-substituted bis-stylnaphthalene), but is not limited thereto.

In addition, the third color conversion material 265 is Perylene, DPVBi (4,4'--bis (2,2'-diphenylvinyl) -1,1'-bipheny), DPVBi (4,4'- -bis(2,2'-diphenylvinyl)-1,1'-biphenyl)-based compound, BFA-IT(2,5-bis{4-[bis-(9,9-dimethyl-2-fluorenyl) amino]phenyl } thiophene) and TBSA (9,10-bis[(2", 7"-t-butyl)-9',9"-spirobifluorenyl]anthracene), but is not limited thereto.

Also, the first color conversion material 160 and the third color conversion material 265 may be formed of a material in which an inorganic semiconductor material is doped with a rare earth metal. More specifically, the first color conversion material 160 may be formed of GaN:Eu in which gallium nitride (GaN) is doped with europium (Eu), and the third color conversion material 265 may be formed of gallium nitride (GaN). It may be made of GaN:Tm doped with thulium (Tm).

In addition, the first color conversion material 160 and the third color conversion material 265 may be made of quantum dots that change the color of emitted light according to their sizes.

That is, in the case of the organic light emitting display device 200 according to another embodiment of the present invention, the green (G) light emitted from the green organic light emitting element 230 and the red light emitted through the first color conversion material 160 ( The R) light and the blue (B) light emitted through the third color conversion material 265 may be mixed to produce white (W) light, and the white (W) light is applied to the second substrate 180 Full color implementation is possible while passing through the provided color filter layer 170 .

That is, in the case of the organic light emitting display device 200 according to another embodiment of the present invention, the green organic light emitting element 230 emitting monochromatic light, the first color conversion material 160 and the third color conversion material 265 ), efficiency and color gamut can be improved compared to an organic light emitting display having a conventional multi-stack organic light emitting element structure.

In addition, in the case of the organic light emitting display device 200 according to another embodiment of the present invention, by reducing the types of organic materials applied to the organic light emitting elements of the organic light emitting display device, it is possible to reduce the material cost of the organic material, and the organic light emitting device By simplifying the structure of the device, organic materials and characteristics of the organic light emitting device can be easily managed.

3 is a diagram illustrating a cross-sectional structure of an organic light emitting display device according to another exemplary embodiment of the present invention.

In describing the organic light emitting diode display according to another exemplary embodiment of the present invention, overlapping detailed descriptions of the same or corresponding components described above will be omitted.

Referring to FIG. 3 , an organic light emitting display device 300 according to another embodiment of the present invention includes a first substrate 110, thin film transistors 120 disposed on the first substrate 110, and A red organic light emitting element 330 positioned between the first electrode (anode) and the second electrode (cathode) and including a red emission layer, and a passivation layer positioned on the red organic light emitting element 330 layer, 140), a filler 150 positioned on the protective layer 140, and a second substrate 180 positioned on the filler 150 and having a color filter layer 170.

In addition, the organic light emitting diode display 300 according to another embodiment of the present invention includes a dam 140 for bonding the first substrate 110 and the second substrate 180 opposite to the first substrate 110. This is an organic light emitting display device using a method of encapsulating the red organic light emitting element 330 through the filler 150 disposed inside the dam 140 between the first substrate 110 and the second substrate 180.

A red emission layer included in the red organic light emitting element 330 of the organic light emitting display device 300 according to another embodiment of the present invention may include a light emitting material that emits red light, and the light emitting material may include: It may be formed using a phosphorescent material or a fluorescent material.

The red emission layer of the red organic light emitting device 330 includes CBP (4,4'-bis(carbozol-9-yl)biphenyl) or mCP (1,3-bis(N-carbozolyl)benzene). may include a host material that contains at least one selected from the group consisting of PQIr (acac) (bis (1-phenylquinoline) acetylacetonate iridium), PQIr (tris (1-phenylquinoline) iridium) and PtOEP (octaethylporphyrin platinum) It may be made of a phosphorescent material containing a dopant, and, alternatively, it may be made of a fluorescent material containing PBD:Eu(DBM)3(Phen) or Perylene, but is not limited thereto.

In addition, in the case of the organic light emitting display device 300 according to another embodiment of the present invention, the second color conversion material 165 and the third color conversion material 265 are interposed between the passivation layer 140 and the color filter layer 170. ).

More specifically, referring to FIG. 3 , in the case of the organic light emitting display device 300 according to another exemplary embodiment of the present invention, the red organic light emitting element 330 emits two different colors of red monochromatic light. The second color conversion material 165 and the third color conversion material 265 capable of emitting light are compounded in the filler 150 positioned between the protective layer 140 and the color filter layer 170. are mixed and placed in the form of

In the organic light emitting display device 300 according to another exemplary embodiment of the present invention, the second color conversion material 165 converts red (R) monochromatic light emitted from the red organic light emitting element 330 positioned below. Green (G) light may be emitted through photo-luminescence, and the third color conversion material 265 may emit red (R) light emitted from the red organic light emitting element 330 positioned below ) and can emit blue (B) light through photo-luminescence.

More specifically, the second color conversion material 165 is Alq3 (tris (8-quinolinolato) aluminum ()), C-545T (10- (2-bezothianzolyl) -1,1,7,7-tetramethyl-2, 3,6,7-tetradro-H,5H,11H-[1]benzo-pyrano[6,7,8-ij]quinolizin-11-one), Quinacridone derivatives, Carbazole derivatives It may be made of any one of, but is not limited thereto.

In addition, the third color conversion material 265 is Perylene, DPVBi (4,4'--bis (2,2'-diphenylvinyl) -1,1'-bipheny), DPVBi (4,4'- -bis(2,2'-diphenylvinyl)-1,1'-biphenyl)-based compound, BFA-IT(2,5-bis{4-[bis-(9,9-dimethyl-2-fluorenyl) amino]phenyl } thiophene) and TBSA (9,10-bis[(2", 7"-t-butyl)-9',9"-spirobifluorenyl]anthracene), but is not limited thereto.

Also, the second color conversion material 165 and the third color conversion material 265 may be formed of a material in which an inorganic semiconductor material is doped with a rare earth metal. More specifically, the second color conversion material 165 may be formed of GaN:Er in which gallium nitride (GaN) is doped with erbium (Er), and the third color conversion material 265 may be formed of gallium nitride (GaN) It may be made of GaN:Tm doped with thulium (Tm).

In addition, the second color conversion material 165 and the third color conversion material 265 may be formed of quantum dots that change the color of emitted light according to size.

That is, in the case of the organic light emitting display device 300 according to another embodiment of the present invention, red (R) light emitted from the red organic light emitting element 330 and green light emitted through the second color conversion material 160 (G) light and blue (B) light emitted through the third color conversion material 265 may be mixed to produce white (W) light. It is possible to implement full color while passing through the color filter layer 170 provided in .

That is, in the case of the organic light emitting display device 300 according to another embodiment of the present invention, the red organic light emitting element 330 emitting monochromatic light, the second color conversion material 165 and the third color conversion material ( 265), efficiency and color reproducibility may be improved compared to an organic light emitting display device having a conventional multi-stack organic light emitting device structure.

In addition, in the case of the organic light emitting display device 300 according to another embodiment of the present invention, by reducing the types of organic materials applied to the organic light emitting elements of the organic light emitting display device, it is possible to reduce the material cost of organic materials. By simplifying the structure of the light emitting device, organic materials and characteristics of the organic light emitting device can be easily managed.

4 is a diagram illustrating a cross-sectional structure of an organic light emitting display device according to another exemplary embodiment of the present invention.

In describing the organic light emitting diode display according to another exemplary embodiment of the present invention, overlapping detailed descriptions of the same or corresponding components described above will be omitted.

Referring to FIG. 4 , an organic light emitting display device 400 according to another embodiment of the present invention includes a first substrate 110, thin film transistors 120 disposed on the first substrate 110, and A blue organic light emitting element 130 positioned between the first electrode (anode) and the second electrode (cathode) and including a blue emission layer, and a passivation layer positioned on the blue organic light emitting element 130 layer, 140), a filler 450 positioned on the protective layer 140, and a second substrate 180 positioned on the filler 450 and having a color filter layer 170.

In addition, the organic light emitting display device 400 according to another embodiment of the present invention includes a dam 140 for bonding the first substrate 110 and the second substrate 180 opposite to the first substrate 110. An organic light emitting display device employing a method of encapsulating the blue organic light emitting element 130 through the filler 450 disposed inside the dam 140 between the first substrate 110 and the second substrate 180.

In addition, in the case of the organic light emitting display device 400 according to another embodiment of the present invention, the first color conversion material 160 and the second color conversion material 165 are interposed between the protective layer 140 and the color filter layer 170. ).

More specifically, referring to FIG. 4 , in the case of the organic light emitting display device 400 according to another embodiment of the present invention, two colors different from the blue monochromatic light emitted from the blue organic light emitting device 130 are emitted. The first color conversion material 160 and the second color conversion material 165 capable of emitting light are mixed and disposed in the form of a compound in the overcoat layer 476 disposed on the color filter layer 170. It can be.

In the organic light emitting display device 400 according to another exemplary embodiment of the present invention, the first color conversion material 160 included in the overcoat layer 476 emits blue light emitted from the blue organic light emitting element 130 positioned below. The monochromatic light of (B) can be received and red (R) light can be emitted through photo-luminescence, and the second color conversion material 165 formed in the overcoat layer 476 is positioned below. The blue organic light emitting device 130 may emit blue (B) monochromatic light and emit green (G) light through photo-luminescence.

Referring to FIG. 4 , in the organic light emitting display device 400 according to another embodiment of the present invention, the overcoat layer 476 is different from the blue (B) light emitted from the blue organic light emitting element 130 below. It may be disposed on a sub-pixel area corresponding to a color.

That is, the overcoat layer 476 including the first color conversion material 160 and the second color conversion material 165 is not formed in the blue (B) sub-pixel region including the blue color filter 173, but red A red (R) sub-pixel area including the color filter 171, a green (G) sub-pixel area including the green color filter 172, and a white (W) sub-pixel area 174 configured not to include the color filter can be placed in

As described above, in the case of an organic light emitting display device according to an embodiment of the present invention, white light is implemented by using a mixture of an organic light emitting element emitting monochromatic light and light emitted through a plurality of color conversion materials, Efficiency and color gamut may be improved compared to an organic light emitting display having a conventional multi-stack organic light emitting device structure.

In addition, in the case of the organic light emitting diode display according to the embodiment of the present invention, by reducing the types of organic materials applied to the organic light emitting element of the organic light emitting display device, it is possible to reduce the material cost of the organic material and simplify the structure of the organic light emitting element. Through this, it is possible to easily manage organic materials and organic light emitting device characteristics.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and may be variously modified and implemented without departing from the technical spirit of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: organic light emitting display device
110: first substrate
120: thin film transistor
130: blue organic light emitting element
140: protective layer
150: filler
160: first color conversion material
165: second color conversion material
170: color filter layer
171: red color filter
172: green color filter
173: blue color filter
174: white sub pixel
175 : Black Matrix
180: second substrate
190: Dam

Claims (22)

an organic light emitting element emitting monochromatic light on the first substrate;
a protective layer disposed to completely cover the organic light emitting element;
a filler disposed to completely cover the passivation layer to encapsulate the organic light emitting device;
a second substrate facing the first substrate and including a color filter layer, the color filter layer facing the filler; and
Including a plurality of color conversion materials mixed in the form of a mixture in the filler,
The plurality of color conversion materials emit light of two colors different from the monochromatic light emitted by the organic light emitting device.
delete According to claim 1,
The organic light emitting device emits light of any one of red, green and blue colors.
According to claim 3,
The plurality of color conversion materials include at least two of a first color conversion material, a second color conversion material, and a third color conversion material,
The first color conversion material, the second color conversion material, and the third color conversion material are each made of an organic semiconductor material.
According to claim 4,
The organic light emitting element emits blue light,
The first color conversion material receives the blue light and emits red light;
The second color conversion material receives the blue light and emits green light.
According to claim 5,
The first color conversion material is DCM (4- (dicyanomethylene) -2-methyl-6- (4-dimethylaminostyryl) -4H-pyran), DCM2 (4- (dicyanomethylene) -2-methyl-6- (juloidin-4 -yl-vinyl)-4H-pyran), DCJTB(4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljuloidyl-9-ehyl)-4H-pyran), DCDDC( 3-(dicyanomethylene)-5,5-dimethyl-1-[(4-dimethylamino)styryl]cyclohexene), AAAP(6-methyl-3-{3-(1,1,6,6-tetramethyl-10-oxo -2,3,5,6-tetrahydro-1H,4H,10H-11-oxa-3a-azabenzo[de]anthracence-9-yl)acryloyl}pyran-2,4-dione), BSN(1,1' -dicyano-substituted bis-stylnaphthalene),
The second color conversion material is Alq3 (tris (8-quinolinolato) aluminum ()), C-545T (10- (2-bezothianzolyl) -1,1,7,7-tetramethyl-2,3,6,7- Organic, consisting of any one of tetradro-H,5H,11H-[1]benzo-pyrano[6,7,8-ij]quinolizin-11-one), quinacridone derivatives, and carbazole derivatives light-emitting display device.
According to claim 4,
The organic light emitting element emits green light,
The third color conversion material receives the green light and emits blue light;
The first color conversion material receives the green light and emits red light.
According to claim 7,
The third color conversion material is perylene, DPVBi (4,4'--bis (2,2'-diphenylvinyl) -1,1'-bipheny), DPVBi (4,4'--bis (2 ,2'-diphenylvinyl)-1,1'-biphenyl)-based compound, BFA-IT (2,5-bis{4-[bis-(9,9-dimethyl-2-fluorenyl) amino]phenyl}thiophene), TBSA (9,10-bis[(2", 7"-t-butyl)-9',9"-spirobifluorenyl]anthracene), and the first color conversion material is DCM (4-(dicyanomethylene) -2-methyl-6-(4-dimethylaminostyryl)-4H-pyran), DCM2(4-(dicyanomethylene)-2-methyl-6-(juloidin-4-yl-vinyl)-4H-pyran), DCJTB(4 -(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljuloidyl-9-ehyl)-4H-pyran), DCDDC(3-(dicyanomethylene)-5,5-dimethyl-1- [(4-dimethylamino)styryl]cyclohexene), AAAP(6-methyl-3-{3-(1,1,6,6-tetramethyl-10-oxo-2,3,5,6-tetrahydro-1H,4H ,10H-11-oxa-3a-azabenzo[de]anthracence-9-yl)acryloyl}pyran-2,4-dione), BSN (1,1'-dicyano-substituted bis-stylnaphthalene), organic light-emitting display device.
According to claim 4,
The organic light emitting element emits red light,
The second color conversion material receives the red light and emits green light;
The third color conversion material receives the red light and emits blue light.
According to claim 9,
The second color conversion material is Alq3 (tris (8-quinolinolato) aluminum ()), C-545T (10- (2-bezothianzolyl) -1,1,7,7-tetramethyl-2,3,6,7- It consists of any one of tetradro-H,5H,11H-[1]benzo-pyrano[6,7,8-ij]quinolizin-11-one), quinacridone derivatives, and carbazole derivatives, The third color conversion material is perylene, DPVBi (4,4'--bis (2,2'-diphenylvinyl) -1,1'-bipheny), DPVBi (4,4'--bis (2 ,2'-diphenylvinyl)-1,1'-biphenyl)-based compound, BFA-IT (2,5-bis{4-[bis-(9,9-dimethyl-2-fluorenyl) amino]phenyl}thiophene), An organic light emitting display device made of any one of TBSA (9,10-bis[(2", 7"-t-butyl)-9',9"-spirobifluorenyl]anthracene).
delete delete According to claim 3,
The plurality of color conversion materials are each made of a material in which an inorganic semiconductor material is doped with a rare earth metal.
According to claim 3,
The plurality of color conversion materials are each made of quantum dots (Quantum Dot), the organic light emitting display device.
According to claim 1,
The second substrate includes red, green, blue, and white sub-pixel regions.
In the top emission type organic light emitting display device including a color filter,
An organic light emitting element emitting monochromatic light, a protective layer disposed to completely cover the organic light emitting element, a filler disposed to completely cover the protective layer to encapsulate the organic light emitting element, and between the filler and the color filter. Including an overcoat layer disposed on,
A plurality of color conversion materials emitting a different color from the monochromatic light are mixed in the form of a mixture in the filler or the overcoat layer,
Organic light emitting of a multi-stack structure in which white light is realized by mixing the monochromatic light emitted from the organic light emitting device and photo-luminescence by the plurality of color conversion materials receiving the monochromatic light. display device.
17. The method of claim 16,
The plurality of color conversion materials are formed of at least one selected from inorganic semiconductor materials, organic semiconductor materials, and quantum dots.
delete 18. The method of claim 17,
The plurality of color conversion materials are included in the overcoat layer, the organic light emitting display device.
According to claim 19,
wherein the overcoat layer is disposed on a sub-pixel region corresponding to a color different from that of the monochromatic light emitted from the organic light emitting device. an organic light emitting element emitting monochromatic light on the first substrate;
a protective layer on the organic light emitting device;
a filler on the protective layer;
a second substrate including a color filter layer disposed on the filler and an overcoat layer disposed on the color filter layer; and
a plurality of color conversion materials disposed between the protective layer and the color filter layer and emitting light of two colors different from the monochromatic light emitted by the organic light emitting device;
The plurality of color conversion materials are mixed in the form of a mixture in the overcoat layer, the organic light emitting display device.
According to claim 21,
The organic light emitting display device, wherein the filler is made of a transparent filler.

Images