TW202018334A - Display device - Google Patents

Abstract

A display device includes: a display panel including an organic electroluminescent element; and a color filter on the display panel and including a plurality of color filter portions spaced from each other on a plane, wherein at least one color filter portion of the color filter portions comprises a scattering agent having an average diameter of 50 nanometers (nm) or more and 500 nm or less.

Description

Display device

Cross-reference of related applications This application claims the priority and benefits of Korean Patent Application No. 10-2018-0101298 filed on August 28, 2018 and Korean Patent Application No. 10-2018-0145665 filed on November 22, 2018 , The entire contents of which are incorporated herein by reference.

The aspect of some exemplary embodiments of the present invention relates to a display device, and is, for example, a display device including a color filter member for avoiding or reducing reflection of external light.

Various display devices used for multimedia devices such as televisions, mobile phones, tablet computers, navigations, and game consoles have been developed. When using such a display device to provide external light into the display device, the external light may be reflected by various components such as electrodes in the display panel, and the display quality of the display device may be reduced.

Therefore, the goal of some embodiments is to improve the display quality of the display device by reducing the reflectance of light provided from the outside.

The above information disclosed in this background section is only for increasing understanding of the background, and thus it may include information of prior art that does not constitute conventional knowledge.

Aspects of some exemplary embodiments of the present invention may include a display device that has relatively improved display quality according to viewing angle and at the same time reduces the reflectance of external light.

Aspects of some exemplary embodiments of the present invention may further include relatively improved display quality by scattering external light in a color filter member (or color filter) to reduce color difference and brightness difference according to viewing angle Display device.

Aspects of some exemplary embodiments of the present invention may further include a display device in which the reflectance due to external light is reduced while minimizing or reducing the reduction in transmittance to improve the display quality difference according to the viewing angle.

According to some exemplary embodiments of the present invention, a display device includes: a display panel including an organic electroluminescent element; and a filter on the display panel including a plurality of color filter parts spaced apart from each other on a plane The color filter, wherein at least one of the color filter portions includes a scattering agent having an average diameter of 50 nm or more and 500 nm or less (50 nm or more and 500 nm or less).

According to some exemplary embodiments, the color filter portion may include: a first color filter portion configured to transmit light of a first wavelength range; and a second color filter configured to transmit light of a second wavelength range different from the first wavelength range Color department.

According to some exemplary embodiments, the color filter portion may include: a first color filter portion configured to transmit red light; and a second color filter portion configured to transmit green light, wherein the first color filter portion and the second color filter portion A scattering agent may be included.

According to some exemplary embodiments, the color filter may further include a third color filter, where the third color filter may include a scattering agent.

According to some exemplary embodiments, the third color filter part may be formed of a transparent photoresist resin.

According to some exemplary embodiments, the third color filter may transmit blue light.

According to some exemplary embodiments, the first content of the scattering agent included in the first color filter may be greater than or equal to the second content of the scattering agent included in the second color filter and the scattering contained in the third color filter The third content of the agent.

According to some exemplary embodiments, the first content may be greater than the third content.

According to some exemplary embodiments, based on the total weight of the first color filter, the first content of the scattering agent included in the first color filter may be greater than 0 wt% and less than or equal to 10 wt% (more than 0 wt% and 10 wt% or less).

According to some exemplary embodiments, the scattering agent may include particles of at least one of TiO ₂ , ZnO, Al ₂ O ₃ , SiO ₂ , hollow silica, or polystyrene.

According to some exemplary embodiments, the color filter may further include an organic layer on the color filter, where the organic layer may include a scattering agent.

According to some exemplary embodiments, based on the total weight of the color filter, the content of the scattering agent in at least one color filter may be greater than 0 wt% and less than or equal to 10 wt%; wherein based on the total weight of the organic layer, the organic The content of the scattering agent in the layer may be 5 wt% or more and 50 wt% or less.

According to some exemplary embodiments, the color filter may further include an organic layer on the color filter, and the fourth content of the scattering agent in the organic layer may be greater than the first content, the second content, and the third content Every.

According to some exemplary embodiments, the color filter may further include a photoresist portion between the color filter portions.

According to some exemplary embodiments, the display panel may further include a sealing member on the organic electric field light emitting element.

According to some exemplary embodiments, the color filter may be directly provided on the sealing member.

According to some exemplary embodiments, the display device may further include an input sensor between the sealing member and the color filter, where the color filter may be directly provided on the input sensor.

According to some exemplary embodiments, the color filter may further include an organic layer on the color filter.

According to some exemplary embodiments, the color filter may further include a base substrate on the color filter part.

According to some exemplary embodiments, the haze value in each color filter may be 30% or less.

According to some exemplary embodiments of the present invention, a display device including a red pixel area, a green pixel area, and a blue pixel area includes: a display panel; and a color filter on the display panel, wherein the color filter includes: corresponding to red The red color filter portion of the pixel area; the green color filter portion corresponding to the green pixel area; and the blue color filter portion corresponding to the blue pixel area, wherein the red color filter portion and the green color filter portion have an average diameter greater than or equal to Scattering agent at 50 nm and less than or equal to 500 nm.

According to some exemplary embodiments of the present invention, the display panel may be an organic light-emitting display panel, which includes: a first light-emitting layer corresponding to the red pixel area and emitting red light; a second light-emitting layer corresponding to the green pixel area and emitting green light Layer; and a third light-emitting layer corresponding to the blue pixel area and emitting blue light.

According to some exemplary embodiments of the present invention, a display device includes: an organic light-emitting display panel; and a color filter on the organic light-emitting display panel and including a red filter portion, a green filter portion, and a blue filter portion, wherein red Each of the color filter portion, the green color filter portion, and the blue color filter portion includes a scattering agent having an average diameter of 50 nm or more and 500 nm or less, wherein the content of the scattering agent in the red color filter portion is greater than or equal to It is equal to the content of the scattering agent in each of the green color filter portion and the blue color filter portion.

According to some exemplary embodiments of the present invention, a display device includes a display panel having an organic electroluminescent element; and a color filter on the display panel, wherein the color filter includes a plurality of color filter parts spaced apart from each other on a plane And an organic layer on the color filter, wherein at least one of the color filter and the organic layer includes a scattering agent having an average diameter of 50 nm or more and 500 nm or less.

According to some exemplary embodiments, the content of the scattering agent in the organic layer may be greater than the content of the scattering agent in each color filter.

According to some exemplary embodiments, the color filter may include: a first color filter portion configured to transmit red light; a second color filter portion configured to transmit green light; and a color filter formed of a transparent photoresist resin The third color filter portion of the transparent color filter or the blue color filter that transmits blue light, wherein the first color filter portion, the second color filter portion, and the organic layer may include a scattering agent, and the third color filter may not include scattering Agent.

Various modifications to the various embodiments of the inventive concept are possible, and the aspects of some exemplary embodiments are illustrated in the drawings and related detailed descriptions are listed. However, this does not limit the various embodiments of the inventive concept to specific embodiments, and it should be understood that as long as it falls within the scope of the appended patent application and its equivalents, the inventive concept covers all the Deformation, equivalent configuration and/or replacement.

In this specification, when referring to a component (or area, layer, part, etc.) is referred to as being "on", "connected to" or "combined to" another component , Which means that the component is directly on, connected or coupled to another component, or there may be a third component in between.

On the other hand, in the present invention, terms such as "directly disposed", "directly on" and the like may refer to the part and another part of the layer, film, area, flat plate or the like No layers, films, regions, plates or the like are added in between. For example, "direct setting" may mean the setting without additional members between two layers or between two members such as adhesive members.

Similar component symbols represent similar components. In addition, for effective explanation, the thickness, proportion and size of the components in the drawings are exaggerated.

"And/or" includes all one or more combinations defined by related components.

It should be understood that the terms "first" and "second" used herein describe various components, but these components should not be limited by these terms. The above terms are only used to distinguish one component from another. For example, without departing from the scope of the inventive concept, the first component may refer to the second component, and vice versa. Unless the context clearly indicates otherwise, singular expressions also include plural expressions.

In addition, terms such as "below", "the lower side", "on", and "the upper side" are used to describe the structure depicted in the drawings Type (configurations) relationship. The terminology is described in a relative concept based on the direction depicted in the figure.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood terms by those with ordinary knowledge in the field to which the present invention belongs. Moreover, the terms as defined in the general dictionary should be interpreted as having the meaning consistent with the meaning in the related technical content, and unless the term is interpreted in an ideal or excessively formal meaning, it will be clarified here definition.

In various embodiments of the inventive concept, the terms "include", "comprise", "including", or "comprising" specify characteristics, regions, fixed numbers, steps, processes , Components and/or assemblies, but does not exclude other characteristics, areas, fixed numbers, steps, processes, components and/or assemblies.

Hereinafter, a display device according to some exemplary embodiments will be described with reference to the drawings.

FIG. 1 is a perspective view of a display device according to some exemplary embodiments, and FIG. 2 is a cross-sectional view of a display device according to some exemplary embodiments. Fig. 2 is a cross-sectional view showing a portion corresponding to the line segment I-I' of Fig. 1. FIG. 3 is a plan view of a display device according to some exemplary embodiments, and FIG. 4 is a cross-sectional view illustrating a portion corresponding to the line segment II-II' of FIG. 3. FIG. 4 is a cross-sectional view of a display device according to some exemplary embodiments. FIG. 5 is a cross-sectional view illustrating an example of an organic electric field light-emitting element included in a display device according to some exemplary embodiments.

Referring to FIG. 1, the display device DS can display the image IM through the display surface IS. As shown in FIG. 1, the display surface IS is parallel to the plane defined by the first direction axis DR1 and the second direction axis DR2 crossing the first direction axis DR1. However, this plane illustrated in FIG. 1 is only an exemplary embodiment, and in other embodiments of the inventive concept, the display surface IS of the display device DS may have a curved shape.

The normal direction of the display surface IS, that is, the thickness direction of the display device DS is indicated by the third direction axis DR3. The front surface (or upper surface) and rear surface (or lower surface) of each member are separated by the third direction axis DR3. However, the directions indicated by the first direction axis DR1, the second direction axis DR2, and the third direction axis DR3 can be converted into other directions by the relative concept.

In FIG. 1, a portable electronic device is shown as an exemplary embodiment of the display device DS. However, the display device DS can be used for medium-sized electronic devices such as personal computers, notebook computers, personal digital terminals, car navigation units, game consoles, smartphones, tablets, and cameras, as well as televisions, screens, or external billboards Of large-sized electronic devices. In addition, these exemplary embodiments and embodiments according to the present invention can be used in other electronic devices without departing from the scope of the inventive concept.

The display surface IS includes a display area DA for displaying the image IM and a non-display area NDA adjacent to the display area DA. The non-display area NDA is a non-display image area. In Figure 1, the clock display window and application icons (icons) are shown as examples of the image IM.

The display area DA may be rectangular. The non-display area NDA may surround or surround the display area DA. However, the embodiment according to the present invention is not limited thereto, and the form of the display area DA and the form of the non-display area NDA can be designed relatively. In addition, the entire surface of the display device DS may not exist in the non-display area NDA.

According to some exemplary embodiments, the display device DS may include a display panel DP and a color filter member (or color filter) CFP located on the display panel DP. The display panel DP may include organic electroluminescent elements OEL-1, OEL-2, and OEL-3. That is, the display panel DP may be an organic light-emitting display panel.

Furthermore, in the display device DS according to some exemplary embodiments, the color filter member CFP may be an anti-reflection member that minimizes reflection of light provided outside the display device DS. For example, the color filter member CFP may block some external light. The color filter member CFP is located on the display panel DP to minimize luminance drop while reducing reflection caused by external light.

According to some exemplary embodiments, the display panel DP may include a base layer BL, a circuit layer DP-CL provided on the base layer BL, and a display element layer DP-OEL. According to some exemplary embodiments, the base layer BL, the circuit layer DP-CL, and the display element layer DP-OEL may be sequentially stacked on the third direction axis DR3.

The base layer BL may be a member that provides a base surface on which the display element layer DP-OEL is located. The base layer BL may be a glass substrate, a metal substrate, a plastic substrate or the like. However, the embodiment is not limited thereto, and the base layer BL may be an inorganic layer, an organic layer, or a composite layer.

According to some exemplary embodiments, the circuit layer DP-CL is located on the base layer BL, and the circuit layer DP-CL may include a plurality of transistors. Each of the transistors may contain control electrodes, input electrodes, and output electrodes. For example, the circuit layer DP-CL may include switching transistors and driving transistors for driving the organic electroluminescent elements OEL-1, OEL-2, and OEL-3.

The display element layer DP-OEL may include organic electroluminescence elements OEL-1, OEL-2, and OEL-3, and a sealing member TFE.

The sealing member TFE may be located on the organic electroluminescent elements OEL-1, OEL-2, and OEL-3. The sealing member TFE can cover the organic electroluminescent elements OEL-1, OEL-2, and OEL-3. The organic electroluminescent elements OEL-1, OEL-2 and OEL-3 may be sealed by a sealing member TFE.

FIG. 3 is an enlarged plan view of a portion of the display device DS according to some exemplary embodiments. FIG. 4 is a cross-sectional view of a display device DS according to some exemplary embodiments, and FIG. 4 is a cross-sectional view illustrating a portion corresponding to the line segment II-II' of FIG. 3.

Referring to FIGS. 3 and 4, the display device DS may include a non-light emitting area NPXA and light emitting areas PXA-R, PXA-G, and PXA-B. Each of the light emitting regions PXA-R, PXA-G, and PXA-B may be a region that emits light generated in each of the organic electric field light emitting elements OEL-1, OEL-2, and OEL-3. The area of each of the light emitting areas PXA-R, PXA-G, and PXA-B may be different from each other, and the area may represent the area when viewed from a plane.

Each of the light emitting regions PXA-R, PXA-G, and PXA-B may be a region that emits light generated in each of the organic electric field light emitting elements OEL-1, OEL-2, and OEL-3. In the display device DS of the embodiment shown in FIGS. 3 and 4, three light emitting regions PXA-R, PXA-G, and PXA-B for emitting red light, green light, and blue light are used as examples. For example, the display device DS according to some embodiments may include a red light emitting region PXA-R, a green light emitting region PXA-G, and a blue light emitting region PXA-B that are separated from each other.

According to some exemplary embodiments, the display panel DP may include a plurality of organic electric field light emitting elements OEL-1, OEL-2, and OEL-3 that emit light in different wavelength regions. A plurality of organic electroluminescent elements OEL-1, OEL-2 and OEL-3 can emit different colors of light. For example, according to some exemplary embodiments, the display panel DP includes a first organic electric field light emitting element OEL-1 emitting red light, a second organic electric field light emitting element OEL-2 emitting green light, and a third organic electric field light emitting blue light Element OEL-3. However, the embodiments are not limited thereto, and the first organic electric field light emitting element OEL-1, the second organic electric field light emitting element OEL-2, and the third organic electric field light emitting element OEL-3 may emit light in the same wavelength range, or At least one can emit light in different wavelength ranges.

In the display device DS of the embodiment shown in FIGS. 3 and 4, the light emitting regions PXA-R, PXA-G, and PXA-B may depend on the organic electric field light emitting elements OEL-1, OEL-2, and OEL- The color of the light emitted by the light emitting layers EML1, EML2, and EML3 of 3 has different areas. For example, referring to FIGS. 3 and 4, in the display panel DP of the embodiment, the blue light emitting region PXA-B of the third organic electric field light emitting element OEL-3 emitting blue light may have the largest area and emit green light The green light emitting region PXA-G of the second organic electric field light emitting element OEL-2 may have the smallest area. However, the embodiment is not limited to this. The light-emitting areas PXA-R, PXA-G, and PXA-B can emit light of colors other than red light, green light, and blue light. Alternatively, the light emitting regions PXA-R, PXA-G, and PXA-B may have the same area. Alternatively, the light emitting regions PXA-R, PXA-G, and PXA-B may be provided as area ratios different from those shown in FIG. 3.

Each of the light emitting regions PXA-R, PXA-G, and PXA-B may be regions separated by the pixel definition layer PDL. The non-light emitting region NPXA, which is a region between adjacent light emitting regions PXA-R, PXA-G, and PXA-B, may be a region corresponding to the pixel definition layer PDL. Also in the present invention, each of the light emitting regions PXA-R, PXA-G, and PXA-B may correspond to pixels.

The pixel definition layer PDL may be formed of a polymer resin. For example, the pixel definition layer PDL may include polyacrylate resin or polyimide resin. In addition, the pixel definition layer PDL may be formed by further including an inorganic material in addition to the polymer resin. On the other hand, the pixel definition layer PDL may be formed to contain a light-absorbing material, or may contain a black pigment or a black dye. The pixel definition layer PDL formed with black pigment or black dye can realize a black pixel definition layer. In forming the pixel definition layer PDL, black pigment or carbon black may be used as the black dye, but the embodiment is not limited thereto.

In addition, the pixel definition layer PDL may be formed of an inorganic material. For example, the pixel definition layer PDL may be formed of silicon nitride (SiN _x ), silicon oxide (SiO _x ), silicon oxynitride (SiO _x N _y ), or the like. The pixel definition layer PDL can define the light emitting regions PXA-R, PXA-G, and PXA-B. The light-emitting areas PXA-R, PXA-G and PXA-B, and the non-light-emitting area NPXA can be distinguished by the pixel definition layer PDL.

The blue light emitting area PXA-B and the red light emitting area PXA-R may be alternately arranged along the first direction axis DR1 to form a first group PXG1. The green light emitting regions PXA-G may be arranged along the first direction axis DR1 to form a second group PXG2.

The first group PXG1 and the second group PXG2 may be spaced on the second direction axis DR2. Each of the first group PXG1 and the second group PXG2 may be provided in plural. The first group PXG1 and the second group PXG2 may be alternately arranged along the second direction axis DR2.

A green light emitting area PXA-G may be spaced apart from a blue light emitting area PXA-B or a red light emitting area PXA-R on the fourth direction axis DR4. The fourth direction axis DR4 may be a direction between the first direction axis DR1 and the second direction axis DR2.

The arrangement structure of the light-emitting regions PXA-R, PXA-G, and PXA-B shown in FIG. 3 is called a pentile structure. However, the arrangement structure of the light emitting regions PXA-R, PXA-G, and PXA-B in the display device DS according to the embodiment is not limited to the arrangement structure shown in FIG. 3. For example, according to some exemplary embodiments, the light emitting regions PXA-R, PXA-G, and PXA-B may have a stripe structure, in which the red light emitting region PXA-R, the green light emitting region PXA-G, and the blue light emitting The areas PXA-B are alternately arranged along the first direction axis DR1 in this order.

Referring to FIGS. 4 and 5, each of the organic electric field light-emitting elements OEL-1, OEL-2, and OEL-3 included in the display device DS of the embodiment includes a first electrode EL1 and a second electrode facing each other The electrode EL2, and the organic layers OL1, OL2, and OL3 between the first electrode EL1 and the second electrode EL2. Each of the organic layers OL1, OL2, and OL3 may include a hole transport region (HTR), a light emitting layer EML1, EML2, and EML3, and an electron transport region (ETR).

That is, each of the organic electroluminescent elements OEL-1, OEL-2, and OEL-3 may include the first electrode EL1, the hole transmission region HTR on the first electrode EL1, and the hole transmission region HTR The light emitting layers EML1, EML2 and EML3, the electron transport area ETR located on the light emitting layers EML1, EML2 and EML3, and the second electrode EL2 located on the electron transport area ETR. The light emitting layers EML1, EML2, and EML3 may be separated by the pixel definition layer PDL.

According to some exemplary embodiments, the organic electroluminescent elements OEL-1, OEL-2, and OEL-3 may further include at least one auxiliary layer interposed between the first electrode EL1 and the second electrode EL2. The presence or absence of the auxiliary layer, the thickness of the auxiliary layer, and the number of auxiliary layers may vary depending on the wavelength region of light emission. The auxiliary layer may be an organic layer that controls the resonance distance in each of the organic electroluminescence elements OEL-1, OEL-2, and OEL-3.

The sealing member TFE may be located on the organic electroluminescence element OEL, and the sealing member TFE may be located on the second electrode EL2. The sealing member TFE may be directly arranged on the second electrode EL2. The sealing member TFE may be one layer or a plurality of stacked layers. The sealing member TFE may be a thin film sealing layer. The sealing member TFE protects the organic electroluminescent elements OEL-1, OEL-2 and OEL-3. The sealing member TFE may cover the upper surface of the second electrode EL2 located in the opening OH and fill the opening OH.

FIG. 5 illustrates a cross-sectional view of organic electric field light-emitting elements OEL-1, OEL-2, and OEL-3 included in the display panel DP according to some exemplary embodiments. The organic electroluminescent element OEL shown in FIG. 5 illustrates an example of the structure of the organic electroluminescent elements OEL-1, OEL-2, and OEL-3 in FIG. 4.

The organic electric field light emitting element OEL may include a first electrode EL1, a hole transmission region HTR on the first electrode EL1, a light emitting layer EML on the hole transmission region HTR, an electron transmission region ETR on the light emitting layer, and electrons The second electrode (EL2) on the transmission area ETR. The hole transport region HTR may include a hole injection layer HIL and a hole transport layer HTL, and the electron transport region ETR may include an electron injection layer EIL and an electron transport layer ETL.

The first electrode EL1 constructing the organic electroluminescence element OEL has conductivity. The first electrode EL1 may be formed of a metal alloy or a conductive compound. The first electrode EL1 may be an anode. The first electrode EL1 may be a pixel electrode.

In the organic electric field light-emitting element OEL according to some exemplary embodiments, the first electrode EL1 may be a reflective electrode. However, the embodiment is not limited to this. For example, the first electrode EL1 may be a transmissive electrode or a semi-transmissive electrode. If the first electrode EL1 is a semi-transmissive electrode or a reflective electrode, it can be composed of Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF/Ca, LiF/Al, Mo, Ti, a compound or mixture thereof (for example, a mixture of Ag and Mg) is formed. Alternatively, it may have a reflective layer or a semi-transmissive layer formed of the material, and indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), and indium tin zinc oxide (ITZO) The multilayer structure of the formed transparent conductive layer. For example, the first electrode EL1 may be a multilayer metal film, and may be a structure of ITO/Ag/ITO stacked metal films.

The hole transmission region HTR may have a single layer made of a single material, a single layer made of a plurality of different materials, or a multilayer structure having a plurality of layers made of a plurality of different materials. The hole transmission region HTR may have a single-layer structure made of a plurality of different materials, or may have a hole injection layer HIL/a hole transmission layer HTL, a hole injection layer HIL that are sequentially stacked from the first electrode EL1 /Hole transport layer HTL/buffer layer, hole injection layer HIL/buffer layer, hole transport layer HTL/buffer layer, or hole injection layer HIL/hole transport layer HTL/electron blocking layer. However, the embodiment is not limited to this.

For example, the hole transmission region HTR may include a hole injection layer HIL and a hole transmission layer HTL, and known hole injection materials and known hole transmission materials may be used for the hole injection layer HIL and hole transmission, respectively Layer HTL.

At the same time, the hole transmission region HTR may be located on the first electrode EL1 in the opening OH defined by the pixel definition layer PDL, and may be configured to extend toward the upper portion of the pixel definition layer PDL. However, the embodiment is not limited thereto, and the hole transmission area HTR may be patterned to be positioned within the opening OH.

The light emitting layer EML is provided on the hole transmission region HTR. The light emitting layer EML may have a single-layer structure of a single material, a single-layer structure of a plurality of different materials, or a multi-layer structure of a plurality of layers of a plurality of different materials.

The light emitting layer EML is not particularly limited to commonly used materials. For example, the light-emitting layer EML may be formed of a material that emits red light, green light, and blue light, and may include a fluorescent material or a phosphorescent material. In addition, the light emitting layer EML may include a host and a dopant. For example, referring to FIGS. 4 and 5, the light emitting layer EML may be located in the opening OH defined in the pixel definition layer PDL, but the embodiment is not limited thereto.

An electron transport area ETR is provided on the light emitting layer EML. The electron transport area ETR may include a hole blocking layer, an electron transport layer ETL, and an electron injection layer EIL, but the embodiment is not limited thereto.

When the electron transport region ETR includes the electron injection layer EIL and the electron transport layer ETL, any suitable electron injection material and electron transport material may be used for the electron injection layer EIL and the electron transport layer ETL, respectively.

The second electrode EL2 is provided on the electron transport area ETR. The second electrode EL2 may be a common electrode or a cathode. The second electrode EL2 may be formed of a metal alloy or a conductive compound. The second electrode EL2 may be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode. If the second electrode EL2 is a transmissive electrode, it may be formed of a transparent metal oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), and indium tin zinc oxide (ITZO).

If the second electrode EL2 is a semi-transmissive electrode or a reflective electrode, it can be composed of Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF/Ca, LiF/Al, Mo, Ti, a compound or mixture thereof (for example, a mixture of Ag and Mg) is formed. Alternatively, it may have a reflective layer or a semi-transmissive layer formed of the material, and made of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), and indium tin zinc oxide (ITZO) The multilayer structure of the formed transparent conductive layer.

Referring to FIG. 4, the electron transport region ETR and the second electrode EL2 may be further extended over the pixel definition layer PDL and the region overlapping the first electrode EL1. At the same time, the second electrode EL2 may be connected to the auxiliary electrode. When the second electrode EL2 is connected to the auxiliary electrode, the resistance of the second electrode EL2 can be reduced.

In the display panel DP according to some exemplary embodiments, the first electrode EL1 may be a reflective electrode, and the second electrode EL2 may be a transmissive electrode among the first electrode EL1 and the second electrode EL2 facing each other. According to some exemplary embodiments, the organic electric field light emitting element OEL may be a front light emitting structure. However, the embodiment is not limited to this.

In FIG. 4, the display device DS may include the color filter member CFP located on the display panel DP. The color filter member CFP may include a plurality of color filter parts CCF1, CCF2, and CCF3. The color filter sections CCF1, CCF2, and CCF3 may be spaced apart from each other on a plane. The color filter sections CCF1, CCF2, and CCF3 may not overlap each other.

Referring to FIGS. 3 and 4, the color filter parts CCF1, CCF2, and CCF3 are spaced apart from each other on a plane, and the color filter parts CCF1, CCF2, and CCF3 may correspond to the light emitting regions PXA-R, PXA-G, and PXA-, respectively. B positioning.

According to some exemplary embodiments, the first color filter CCF1 may be a red filter that transmits red light; the second color filter CCF2 may be a green filter that transmits green light; and the third color filter CCF3 may be Blue color filter that transmits blue light. Each of the color filter sections CCF1, CCF2, and CCF3 may include a polymer photoresist resin and a pigment or dye. The first color filter part CCF1 may contain red pigment or dye; the second color filter part CCF2 may contain green pigment or dye; and the third color filter part CCF3 may contain blue pigment or dye.

However, the embodiment is not limited to this, and the third color filter portion CCF3 may not contain pigment or dye. The third color filter part CCF3 may contain a polymer photoresist resin and may not contain a pigment or dye. The third color filter part CCF3 may be transparent. The third color filter portion CCF3 may be formed of transparent photoresist resin.

In the display device DS according to some exemplary embodiments, the first color filter part CCF1 may be configured to correspond to the first organic electric field light emitting element OEL-1; the second color filter part CCF2 may be configured to correspond to the second organic The electric field light emitting element OEL-2; and the third color filter portion CCF3 may be configured to correspond to the third organic electric field light emitting element OEL-3. For example, the first color filter CCF1 may be configured to correspond to the first light emitting layer EML1; the second color filter CCF2 may be configured to correspond to the second light emitting layer EML2; and the third color filter CCF3 may be configured to correspond to In the third light emitting layer EML3. The first color filter portion CCF1 may correspond to the red light emitting area PXA-R; the second color filter portion CCF2 may correspond to the green light emitting area PXA-G; and the third color filter portion CCF3 may correspond to the blue light emitting area PXA-B.

FIG. 6 is a cross-sectional view of the color filter member CFP of the display device DS included in some exemplary embodiments. The color filter member CFP includes a plurality of color filter parts CCF1, CCF2, and CCF3, and at least one of the plurality of color filter parts CCF1, CCF2, and CCF3 includes a scattering agent SP. Referring to FIG. 6, according to some exemplary embodiments, the first color filter portion CCF1 and the second color filter portion CCF2 may include the scattering agent SP, and the third color filter portion CCF3 may not include the scattering agent SP. Meanwhile, unlike this, according to some exemplary embodiments, the first color filter portion CCF1 may include the scattering agent SP, and the second color filter portion CCF2 and the third color filter portion CCF3 may not include the scattering agent SP.

The color filter portions CCF1, CCF2, and CCF3 may include a matrix portion MR formed of a polymer photoresist resin. The scattering agent SP can be scattered in the matrix portion MR. In addition to the polymer photoresist resin, the matrix portion MR may further contain a pigment or dye. According to some exemplary embodiments, the matrix portion MR of the first color filter portion CCF1 and the second color filter portion CCF2 may further include pigments or dyes, and the third color filter portion CCF3 may include a polymer photoresist resin and may not include pigments Or dye. Meanwhile, according to some exemplary embodiments, the third color filter part CCF3 may include a matrix part MR having a polymer photoresist resin and a pigment or dye.

The scattering agent SP may contain particles of at least one of TiO ₂ , ZnO, Al ₂ O ₃ , SiO ₂ , hollow silica, or polystyrene. The scattering agent SP may contain any particles of TiO ₂ , ZnO, Al ₂ O ₃ , SiO ₂ , hollow silica and polystyrene, or may be selected from TiO ₂ , ZnO, Al ₂ O ₃ , SiO ₂ , Particles of a mixture of two or more materials in hollow silica and polystyrene formed from polystyrene resin. For example, the color filter member CFP according to some exemplary embodiments may be one containing TiO ₂ as a scattering agent.

FIG. 7 is a cross-sectional view of a scattering agent included in a color filter member according to some exemplary embodiments. According to some exemplary embodiments, the scattering agent SP may be spherical particles. However, the exemplary embodiment is not limited thereto, and the scattering agent SP may be elliptical or amorphous.

Referring to FIG. 7, according to some exemplary embodiments, the cross section of the scattering agent SP may be circular. However, the embodiment is not limited thereto, and the cross section of the scattering agent SP may be elliptical or amorphous.

The average diameter of the scattering agent SP may be less than 500 nm. For example, the scattering agent SP may have an average diameter of 50 nm or more and 500 nm or less. For example, the average diameter of the scattering agent SP may be the arithmetic average of the diameter D _SP in the cross section of the plural scattering agents SP.

When the average diameter of the scattering agent SP is less than 50 nm, in order to show the scattering effect in the color filter sections CCF1, CCF2, and CCF3, the content of the scattering agent SP is relatively reduced, and in this case, in the color filter section CCF1 The transmittance in CCF2 and CCF3 can be reduced. Moreover, when the average diameter of the scattering agent SP becomes less than 50 nm, in the color filter sections CCF1, CCF2, and CCF3, the change in relative luminance value according to the viewing angle becomes larger, and thus the viewing angle decreases according to the viewing angle The resulting color difference. Therefore, the display quality improvement effect may not be displayed.

In addition, when the average diameter of the scattering agent SP is greater than 500 nm, due to the relatively large particle size, when the color filters CCF1, CCF2, and CCF3 are formed, the film performance may be deteriorated. Also, if the average diameter of the scattering agent SP is greater than 500 nm, it may be difficult to eject the resin provided at the nozzle for forming the color filter portions CCF1, CCF2, and CCF3 during the manufacturing process. That is, due to the large diameter of the scattering agent SP, the discharge ports of the nozzles used to form the color filter sections CCF1, CCF2, and CCF3 may be blocked.

FIG. 8 is a graph showing the viewing angle characteristics of a specific wavelength according to the size of the scattering agent. In Fig. 8, the comparative example is when the diameter of the scattering agent is 25 nm. Example 1-1 is the case when the diameter of the scattering agent is 50 nm. Example 1-2 is when the diameter of the scattering agent is 200 nm. The relative luminance per wavelength of each wavelength is plotted for each of Comparative Example, Example 1-1, and Example 1-2. Brightness was evaluated at wavelengths of 450 nm, 550 nm, and 630 nm. FIG. 8 shows the relative brightness value in the color filter portion including the scattering agent, and the X axis shows the viewing angle at which the color filter portion is seen. The angle of the X axis in Fig. 8 refers to an angle of up to 180° in the clockwise or counterclockwise direction when the front face is 0°. On the other hand, the viewing angle of the X axis at 90° or more corresponds to the rear direction with respect to the front direction of 0° (with reference to 0°). The Y axis of FIG. 8 shows the brightness scattered by the scattering agent. In addition, in FIG. 8, the Y axis is based on the relative brightness when the maximum brightness is 1.

Referring to FIG. 8, in the case of the comparative example, the diameter of the scattering agent is less than 50 nm, and when it is 90° or more in the lateral direction with respect to 0°, it is the front side, and is caused by the scattering agent The relative brightness value increases. This is due to back scattering caused by the scattering agent. In contrast to this, in the case of Example 1-1 using a scattering agent having a diameter of 50 nm, the backscatter angle of 90° or more in the lateral direction is not large as compared with the comparative example. Moreover, compared with the comparative example and example 1-1, in the case of example 1-2, it can be seen that the backscatter is significantly reduced, and the front viewing angle at all wavelengths (450 nm, 550 nm, and 630 nm) is The relative brightness difference between the side viewing angles is also reduced.

That is, in the case where the diameter of the scattering agent is less than 50 nm, if the back scattering becomes larger, the brightness to the front side is reduced, so the diameter of the scattering agent may be 50 nm or more. Moreover, it can be confirmed that as the diameter of the scattering agent SP increases, the difference in brightness according to the wavelength decreases.

In other words, the color filter member CFP used in the display device DS according to some exemplary embodiments may contain a scattering agent having an average diameter of 50 nm or more to reduce the difference in brightness according to the viewing angle while minimizing The decrease in front luminance. Therefore, the difference in display quality caused by the viewing angle can be improved. Further, the color filter member CFP including a scattering agent having an average diameter of 500 nm or less can have good film characteristics, and thus can exhibit good display quality.

Referring again to FIG. 6, according to some exemplary embodiments, the color filter member CFP may further include a photoresist portion BM between the color filter portions CCF1, CCF2, and CCF3. Referring to FIGS. 3 and 4, a plurality of color filter sections CCF1, CCF2, and CCF3 may be arranged on a plane defined by the first direction axis DR1 and the second direction axis DR2.

The photoresist portion BM may be located between the color filter portions CCF1, CCF2, and CCF3 spaced apart from each other, and may be a black matrix. The photoresist portion BM may be formed of an organic light-shielding material or an inorganic light-shielding material containing black pigment or dye. The photoresist portion BM can avoid light leakage and distinguish the boundary between adjacent color filter portions CCF1, CCF2, and CCF3.

On the other hand, at least a part of the photoresist portion BM may be configured to overlap the color filter portions CCF1, CCF2, and CCF3. In other words, on the plane defined by the first direction axis DR1 and the third direction axis DR3, the photoresist portion BM may be arranged to overlap at least at least the color filter portions CCF1, CCF2, and CCF3 in the thickness direction a part.

The color filter member CFP according to some exemplary embodiments may further include an organic layer OC. The organic layer OC may be located on the color filters CCF1, CCF2, and CCF3. The organic layer OC may surround irregularities of the color filters CCF1, CCF2, and CCF3. That is, in the color filter member CFP according to some exemplary embodiments, the organic layer OC may be a planarization layer. The organic layer OC can fill gaps between the color filter portions CCF1, CCF2, CCF3, and the photoresist portion BM, and can flatten the upper surface of the color filter member CFP exposed outside.

Further, although shown in the drawings, the organic layer OC is located above the color filter portions CCF1, CCF2, and CCF3, the embodiment is not limited thereto, and the organic layer OC may be located on the color filter portions CCF1, CCF2, and Below CCF3. For example, the organic layer OC may be located between the display element layer DP-OEL and the color filter sections CCF1, CCF2, and CCF3.

On the other hand, the organic layer OC may be a protective layer for protecting the color filter sections CCF1, CCF2, and CCF3. The organic layer OC may be transparent. The organic layer OC may be formed of a polymer resin. On the other hand, the organic layer OC may further contain functional materials in addition to the polymer resin. For example, the organic layer OC may further include functional materials such as light absorbers, antioxidants, and the like. Also, according to some exemplary embodiments which will be described in more detail later, the organic layer OC may contain a scattering agent SP.

In the embodiment shown in FIG. 6, the third color filter portion CCF3, which is a portion that transmits relatively short wavelength light among the color filter portions CCF1, CCF2, and CCF3 of the color filter member CFP, may not include a scattering agent SP. Compared with the third color filter part CCF3, the first color filter part CCF1 and the second color filter part CCF2 transmitting relatively long wavelength light contain a scattering agent SP to scatter the incident light incident on the first color filter part CCF1 and the second color filter part The light on CCF2. Therefore, it is possible to improve the display quality of the display device DS by reducing the color difference according to the viewing angle or the brightness difference according to the viewing angle.

In other words, if the resonance distances of the organic electroluminescent elements OEL-1, OEL-2, and OEL-3 are the same as in the display device DS, the first organic electroluminescent elements OEL-1 and In the two organic electroluminescent element OEL-2, the difference in brightness according to the viewing angle can be large. Therefore, the scattering agent is contained in the first color filter portion CCF1 and the second color filter portion CCF2 located in the first organic electroluminescent element OEL-1 and the second organic electroluminescent element OEL-2, respectively, to effectively scatter light, Therefore, it is possible to reduce the difference in color luminance depending on the viewing angle.

However, the embodiment is not limited thereto, and the third color filter portion CCF3 in the color filter member CFP according to some exemplary embodiments may further include a scattering agent SP.

FIG. 9 illustrates an example of a color filter member included in a display device according to some exemplary embodiments, and according to some embodiments, the color filter member CFP-a may include a plurality of color filter portions CCF1, CCF2, and CCF3. Each of the color filter sections CCF1, CCF2, and CCF3 in the color filter member CFP-a according to some exemplary embodiments may include a scattering agent SP. In the color filter sections CCF1, CCF2, and CCF3, the scattering agent SP may be scattered in the matrix section MR. When the color filter member CFP-a of the embodiment shown in FIG. 9 is compared with the color filter member CFP in FIG. 6 described above, the difference is that the third color filter portion CCF3 further contains a scattering agent SP. On the other hand, each of the color filters CCF1, CCF2, and CCF3 may contain a different kind of scattering agent SP. Moreover, the content of the scatter agent SP in each of the color filters CCF1, CCF2, and CCF3 may be different from or the same as each other, and the size of the scatter agent SP in each of the color filters CCF1, CCF2, and CCF3 may be different from each other Different from each other or the same.

The content of the scattering agent SP contained in the first to third color filter portions CCF1, CCF2, and CCF3 may be similar. The content of the scattering agent SP contained in the first to third color filters CCF1, CCF2, and CCF3 may be greater than 0 wt% based on the total weight of the first to third color filters CCF1, CCF2, and CCF3 And less than or equal to 10 wt%. The content of the scattering agent SP included in each of the first to third color filter portions CCF1, CCF2, and CCF3 may be greater than 0 based on the sum (100 wt%) of the contents of the matrix portion MR and the scattering agent SP wt% and less than or equal to 10 wt%. For example, the first color filter portion CCF1 as a red color filter portion may contain a scattering agent greater than 0 wt% and less than or equal to 10 wt%.

According to some exemplary embodiments, the first to third color filter portions CCF1, CCF2, and CCF3 may include a scattering agent SP greater than 0 wt%, thereby reducing the difference in color brightness according to the viewing angle. However, in the case where the content of the scattering agent SP exceeds 10 wt%, when the first to third color filters CCF1, CCF2, and CCF3 are formed, the scattering agent SP affects the exposure process, so that the first to third color filters are manufactured CCF1, CCF2 and CCF3 have difficulties.

Each of the first to third color filters CCF1, CCF2, and CCF3 may include the scattering agent SP in the following ratio. Table 1 below shows the front luminance rate and WAD improvement rate (WAD) for the embodiment in which the ratio of the scattering agent ratios included in the first to third color filters CCF1, CCF2, and CCF3 is changed. improvement rate).

In Table 1, the front luminance ratio shows the degree of reduction of the luminance at the front of the display device based on the color filter portion that does not contain a scattering agent. In addition, the WAD improvement rate shows the degree of improvement of the chromatic aberration (Δu'v') of the display device at all angles in the lateral direction with respect to the front, and shows the chromatic aberration based on the color difference Improvement ratio of color difference (improvement ratio). For example, in Example 1, when the front brightness of the color filter portion without the scattering agent is 100, a front brightness ratio of -27% means that the brightness is reduced by 27%. Furthermore, in Example 1, based on the color difference value of the color filter portion that does not contain the scattering agent, the 50% WAD improvement rate represents the ratio of the degree of reduction of the color difference value in Example 1.

Table 1

In the example of Table 1, when the content of the scattering agent SP contained in the first color filter part CCF1 is 1.0, the content of the scattering agent SP contained in the second color filter part CCF2 and the third color filter part CCF3 is relatively shown. content.

Example 1 is a case where the ratio of the scattering agent included in the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3 is 1:0.5:0.4. Example 2 contains a scattering agent in a ratio of 1:0.8:0.6. Example 3 is the case where the ratio of the included scattering agent is 1:0.6:0.4. Example 4 corresponds to the case where the scattering agents included in the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3 have the same content.

According to some exemplary embodiments, the ratio of the content of the scattering agent included in the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3 is 1: x: y, and at this time, x is greater than 0.5 and less than 1; y is greater than 0 and less than 1; and x may be greater than y.

That is, the first content which is the content of the scattering agent SP contained in the first color filter part CCF1 and the second content which is the content of the scattering agent SP contained in the second color filter part CCF2 may be 1: 0.5 to 1:1. In addition, the first content which is the content of the scatter agent SP contained in the first color filter part CCF1 and the third content of the content of the scatter agent SP contained in the third color filter part CCF3 may be 1:0 to 1:1. In addition, referring to the results in Table 1, it is the first content of the content of the scattering agent SP contained in the first color filter part CCF1 and the second content of the content of the scattering agent SP contained in the second color filter part CCF2 It may be 1:0.5 to 1:1, and is the first content of the content of the scattering agent SP contained in the first color filter part CCF1, and the content of the scattering agent SP contained in the third color filter part CCF3 The third content may be 1:0.4 to 1:1.

Meanwhile, in the case of the display device according to some exemplary embodiments, the addition of the scattering agent to the color filter portion causes a partial reduction in front brightness, and if the reduction rate of front brightness is less than 30%, it means good brightness value. Therefore, when the display device according to some exemplary embodiments displays a luminance reduction rate of 30% or less and improves the WAD value, it can be seen that the display quality of the display device is improved.

Referring again to Table 1, in all the examples, it can be seen that the brightness reduction rate is less than 30% and all WAD values are improved. That is, in the embodiment in which the scattering agent is included in the color filter portion, it can be checked that the display quality is improved compared to the case where the scattering agent is not included.

In addition, when referring to Table 1, from the fact that the WAD improvement rate of Example 1 is the highest among the examples, it can be seen that it is included in the first color filter portion CCF1, the second color filter portion CCF2, and the third The ratio of the scattering agent in the color filter part CCF3 is 1:0.5:0.4 compared to the ratio of the scattering agent included in the first color filter part CCF1, the second color filter part CCF2 and the third color filter part CCF3 is 1: In the case of 1:1, the display quality is more improved.

FIG. 10 illustrates another embodiment of the color filter included in the display device according to the exemplary embodiment of the present invention. According to some exemplary embodiments, the color filter member CFP-b may include a plurality of color filter parts CCF1, CCF2, and CCF3. Each of the color filter sections CCF1, CCF2, and CCF3 may contain a scattering agent SP. In the color filter sections CCF1, CCF2, and CCF3, the scattering agent SP may be scattered in the matrix section MR. When the color filter member CFP-b of the embodiment shown in FIG. 10 is compared with the color filter member CFP of FIG. 6 described above, the difference is that the third color filter portion CCF3 further contains a scattering agent SP.

In addition, the color filter member CFP-b of the embodiment shown in FIG. 10 may correspond to the scattering agent included in each of the first color filter portion CCF1, the second color filter portion CCF2, and the third color filter portion CCF3 SP content is different from each other. The content of the scattering agent SP contained in the first color filter part CCF1 may be greater than the content of the scattering agent SP contained in the second color filter part CCF2 and the third color filter part CCF3.

For example, the first content of the scattering agent SP contained in the first color filter CCF1 may be greater than the second content of the scattering agent SP contained in the second color filter CCF2 and the scattering contained in the third color filter CCF3 The third content of agent SP. Specifically, the content of the scattering agent included in the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3 may have a relationship of first content>second content>third content. Alternatively, the first content and the second content may be the same, and the first content may be greater than the third content.

In other words, in the color filter member CFP-b according to the embodiment, the scattering agent in the first color filter part CCF1, the second color filter part CCF2, and the third color filter part CCF3 transmitting light in different wavelength regions The contents may be different from each other. When the color filter that transmits relatively long wavelength light is large, it may contain a relatively large amount of scattering agent.

However, the embodiment is not limited to this, and depends on the first organic electric field light emitting element OEL-1, the second organic electric field light emitting element OEL-2, and the third organic electric field light emitting element OEL-3 used in the display device DS The structure of the device can relatively control the content of the scattering agent contained in the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3.

On the other hand, the refractive index of the scattering agent SP and the refractive index of the matrix portion MR may be different in each of the first color filter portion CCF1, the second color filter portion CCF2, and the third color filter portion CCF3 . Due to the difference in refractive index between the scattering agent SP and the matrix portion MR, light incident on the first color filter portion CCF1, the second color filter portion CCF2, and the third color filter portion CCF3 can be effectively scattered. The refractive index difference Δn between the scattering agent SP and the matrix portion MR may be 0.05 or more and 0.1 or less.

Figure 11 shows the relationship between haze and front luminance reduction rate. That is, as the haze value increases, the frontal brightness reduction rate can be increased. Referring to the results in Figure 11, as the haze value increases, the rate of decrease in brightness can increase linearly. Therefore, the haze value of the color filter member CFP can be adjusted to 30% or less to maintain the front brightness reduction rate at 25% or less. For example, the haze value of each of the color filter portions CCF1, CCF2, and CCF3 in the color filter member CFP according to some embodiments may be 30% or less.

That is, the color filter sections CCF1, CCF2, and CCF3 include the scattering agent SP having an average diameter of 50 nm or more and 500 nm or less to effectively scatter the light incident on the color filter sections CCF1, CCF2, and CCF3, thereby reducing The difference in color brightness according to the viewing angle. When the color filter sections CCF1, CCF2, and CCF3 include 10 wt% or less of the scattering agent SP, the haze value can be maintained at 30% or less to minimize the reduction in frontal brightness.

FIG. 12 is a line graph showing the change of the front luminance ratio according to the content of the scattering agent contained in the color filter. Referring to FIG. 12, when the content of the scattering agent increases, it can be seen that the front luminance ratio increases in all the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3. However, in the case where the first color filter CCF1 transmits light in a relatively long wavelength region, it can be seen that the front luminance ratio at the same content of the scattering agent is higher compared to the third color filter CCF3. In other words, in order to show the same front luminance ratio in the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3, the content of the scattering agent included in the third color filter CCF3 can be adjusted The content of the scatter agent less than that contained in the first diffuser part CCF1 is included.

For example, in order to display similar front luminance ratios in the first to third color filter sections CCF1, CCF2, and CCF3, the content of the scattering agent included in the color filter sections CCF1, CCF2, and CCF3 may be adjusted so that the first content ≥ the second Content ≥ third content, or first content> second content> third content. Here, the first content may be the content of the scattering agent contained in the first color filter part CCF1; the second content may be the content of the scattering agent contained in the second color filter part CCF2; and the third content may include The content of the scattering agent in the third color filter CCF3.

Figures 13 and 14 show the color difference Δu'v' according to the "Polar angle", which is the viewing angle. FIG. 13 shows the color difference in the display device according to the content of the scattering agent, and FIG. 14 shows the color difference in the display device according to the thickness of the color filter.

In Fig. 13, the color difference according to the viewing angle is shown according to the content of the scattering agent. In Figure 13, "reference" corresponds to the case of using polarizing members, and the rest show that the scattering agent is included in the color filter at 0 wt%, 0.3 wt%, 0.6 wt%, and 1 wt%, respectively. The situation in the Ministry. That is, in Figure 13, the "reference" is the case where a polarizing member is used instead of a color filter member in the display device, and the remaining display scatterers are at 0 wt%, 0.3 wt%, 0.6 wt%, and 1 wt%, respectively. Is included in the color filter of the color filter member of the display device. Referring to FIG. 13, it can be seen that as the content of the scattering agent increases, the chromatic aberration at the later viewing angle increases. That is, the display device according to some exemplary embodiments may include a scattering agent in the color filter part to reduce the color difference at the side and front.

In FIG. 14, the color difference according to the viewing angle is shown according to the thickness of the color filter. In FIG. 14, the “reference” corresponds to the case where the polarizing member is used, and the remaining display filter cases have thicknesses of 3 μm, 6 μm, and 9 μm, respectively. That is, in FIG. 14, the “reference” is the case where the polarizing member is used instead of the color filter member in the display device, and the thickness of the color filter portions of the remaining color filter members displayed in the display device are 3 μm, respectively , 6 μm and 9 μm. Referring to FIG. 14, it can be seen that as the thickness of the color filter portion increases, the chromatic aberration of the lateral viewing angle decreases. On the other hand, an increase in the thickness of the color filter portion may refer to an increase in the total content of the scattering agent in the color filter portion. In other words, if the content of the scattering agent contained in the color filter unit in units of volume is the same, as the thickness of the color filter unit increases, the absolute amount of the scattering agent contained in the color filter unit increases. Therefore, FIG. 14 shows that when the total content of the scattering agent increases, the scattering angle of light incident on the color filter portion increases, thereby reducing the chromatic aberration at the side and front.

15 and 16 are cross-sectional views of color filter members according to various embodiments. The color filter members CFP-c and CFP-d shown in FIGS. 15 and 16 may be included in the display device DS (see FIG. 1) according to some exemplary embodiments.

Compared with the color filter member CFP according to the embodiment shown in FIG. 6, the color filter member CFP-c according to the embodiment shown in FIG. 15 has the difference that the scattering agent SP is further contained in the organic layer OC . In addition, compared to the color filter member CFP-b according to the embodiment of FIG. 10, the color filter member CFP-d according to the embodiment shown in FIG. 16 has the difference that the scattering agent SP is further contained in the organic layer OC. On the other hand, in the description of the color filter members CFP-c and CFP-d in the embodiments shown in FIGS. 15 and 16, in addition to the fact that the organic layer OC also includes the scattering agent SP, the The same contents as those described in FIG. 6 and FIG. 10 can be applied to the scattering agent SP and the color filters CCF1, CCF2, and CCF3.

That is, the color filter members CFP-c and CFP-d according to some exemplary embodiments may include a plurality of color filter parts CCF1, CCF2, and CCF3, and an organic layer on the plurality of color filter parts CCF1, CCF2, and CCF3 OC, and at least one of the plurality of color filters CCF1, CCF2, CCF3, and the organic layer OC may include a scattering agent SP. The average diameter of the scattering agent SP in at least one of the plurality of color filters CCF1, CCF2, CCF3, and the organic layer OC may be 50 nm or more and 500 nm or less. The refractive index difference Δn between the polymer resin forming the organic layer OC and the scattering agent SP may be 0.05 or more and 0.1 or less.

In the color filter members CFP-c and CFP-d according to the embodiment, even when the scatter agent SP is included in the organic layer OC except the color filter parts CCF1, CCF2, and CCF3, the color filter parts CCF1 The content of the scattering agent SP in CCF2 and CCF3 is relatively reduced, and it is still possible to exhibit the effect of improving the difference in display quality according to the viewing angle.

In the case of the color filter members CFP-c and CFP-d according to some embodiments, compared to the case where the scattering agent SP is not included in the organic layer OC, it is possible that by including in the organic layer OC The scattering agent SP relatively reduces the content of the scattering agent SP contained in the color filters CCF1, CCF2, and CCF3. Therefore, it is possible to reduce the problem of non-curing of the matrix portions of the color filter portions CCF1, CCF2, and CCF3, which occurs when the color filter portions CCF1, CCF2, and CCF3 are formed according to the addition of the excessive scattering agent SP. That is, in addition to the color filter portions CCF1, CCF2, and CCF3, the organic layer OC contains the scattering agent SP so that it can exhibit the improvement effect of the optical characteristics due to the addition of the scattering agent SP, and improve the color filter portion CCF1 for forming The process of CCF2 and CCF3.

On the other hand, the content of the scattering agent SP in the organic layer may be greater than the content of the scattering agent SP of the color filter portion including the scattering agent SP among the plurality of color filter portions CCF1, CCF2, and CCF3. For example, each of the plurality of color filters CCF1, CCF2, and CCF3 may include a scattering agent SP, and the content of the scattering agent SP in each of the color filters CCF1, CCF2, and CCF3 including the scattering agent SP may be greater than The content of the scattering agent SP in the organic layer OC.

According to some exemplary embodiments, based on the total weight of each of the color filters CCF1, CCF2, and CCF3, the content of the scattering agent SP in each of the color filters CCF1, CCF2, and CCF3 may be greater than 0 wt% and less than 10 wt%. Also, based on the total weight of the organic layer OC, the content of the scattering agent SP in the organic layer OC may be 5 wt% or more and 50 wt% or less. When the content of the scattering agent SP in the organic layer OC is less than 5 wt%, the improvement of the color difference reduction effect according to the viewing angle is not obvious, and when the content of the scattering agent SP in the organic layer OC exceeds 50 wt%, The brightness of the display device can be reduced by an excessive amount of scattering agent SP.

In the color filter member CFP-c of the embodiment shown in FIG. 15, the first color filter portion CCF1 transmits red light and the second color filter portion CCF2 transmits green light. The third color filter portion CCF3 may be a blue color filter that transmits blue light, or the third color filter portion CCF3 may be a transparent color filter formed of a transparent photoresist resin. Referring to FIG. 15, the first color filter portion CCF1 and the second color filter portion CCF2 contain the scattering agent SP, and the third color filter portion CCF3 does not contain the scattering agent SP. In addition, in FIG. 15, the organic layer OC may contain a scattering agent SP.

For example, the organic layer OC includes Al ₂ O ₃ as a scattering agent SP; and the first color filter CCF1 includes ZnO as a scattering agent SP; and the second color filter CCF2 includes SiO ₂ as a scattering agent SP; and the third The color filter part CCF3 may not contain a scattering agent. In particular, the organic layer OC contains 30 wt% of Al ₂ O ₃ with an average diameter of 300 nm relative to the total weight of the organic layer. The first color filter portion CCF1 contains 8.5% by weight of ZnO having an average diameter of 400 nm with respect to the total weight of the first color filter portion. Relative to the total weight of the second color filter, the second color filter CCF2 may contain 5 wt% of SiO ₂ having an average diameter of 200 nm. On the other hand, the type of scattering agent, the average diameter of the scattering agent, and the content of the scattering agent are only examples, and the type and content of the scattering agent can be variously combined within the scope of the inventive concept.

16 is a schematic diagram illustrating a color filter member CFP-d, in which the contents of the scattering agent SP included in each of the first color filter part CCF1, the second color filter part CCF2, and the third color filter part CCF3 are mutually Different, and the organic layer OC contains a scattering agent SP. For example, the first content of the scattering agent SP in the first color filter CCF1 may be greater than the second content of the scattering agent SP in the second color filter CCF2 and the scattering agent in the portion of the third color filter CCF3 The third content of SP. In particular, the content of the scattering agent SP in the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3 may have a relationship of first content>second content>third content. Alternatively, the first content and the second content may be the same, and the first content may be greater than the third content.

On the other hand, the fourth content of the scattering agent SP in the organic layer OC is greater than the first to third content of the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3, and for example, this It may have a relationship of first content>second content>third content>fourth content.

At the same time, although FIG. 16 shows the case where the contents of the scattering agent SP in the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3 are different, the embodiment does not take this as limit. The content of the scattering agent SP in the first color filter CCF1, the second color filter CCF2, and the third color filter CCF3 may be the same. Although in this case, the content of the scattering agent SP in the organic layer OC may be greater than the content of the scattering agent in each of the first color filter portion CCF1, the second color filter portion CCF2, and the third color filter portion CCF3.

Figure 17 shows the color difference Δu'v' based on the "polar angle", which is the viewing angle. In Fig. 17, "reference" corresponds to the case where a polarizing member is used. In Example 2-1, the scattering agent is contained only in the color filter. Example 2-2 illustrates the case where the color filter and the organic layer contain a scattering agent. Example 2-1 shows that the first color filter part CCF1 contains 3.9 wt% of the scattering agent SP, the second color filter part CCF2 contains 1.9 wt% of the scattering agent SP, and the third color filter part CCF3 contains 1.4 wt% of scattering Agent SP. Example 2-2 corresponds to the case when 5.2 wt% of the scattering agent SP is additionally included in the organic layer OC of Example 2-1.

Referring to FIG. 17, it can be seen that the chromatic aberration at the side viewing angel in Examples 2-1 and 2-2 is reduced compared to the “reference”. In addition, it can be seen that Example 2-2 exhibits improved viewing angle characteristics compared to Example 2-1.

In the display device DS of the embodiment described with reference to FIGS. 1 to 10, the color filter member CFP may be directly located on the display panel SP. Further, the color filter member CFP may be directly positioned on the sealing member TFE. On the other hand, the display device DS according to some exemplary embodiments may include the color filter member CFP, and may not include the polarizing member.

That is to say, the display device DS of the above embodiment can arrange the color filter member CFP on the display panel DP to reduce the reflection of external light, and thus it is possible to improve the display quality. Moreover, the display device DS according to some exemplary embodiments includes a color filter member CFP and no polarizing member on the display panel DP to reduce the reflection of external light while minimizing the reduction in brightness, and thus it is possible to display good display quality. Furthermore, the display device DS according to some exemplary embodiments includes a scattering agent having an average diameter of 50 nm or more and 500 nm or less in the color filter member CFP to effectively scatter light incident on the color filter member CFP, Therefore, the chromatic aberration according to the viewing angle is reduced. The display device DS can maintain a brightness value of 85% or more by maintaining a haze value of 30% or less.

FIG. 18 is a cross-sectional view illustrating a display device according to some exemplary embodiments. Compared with the display device DS of the embodiment described with reference to FIG. 4, the display device DS-1 according to some exemplary embodiments may further include an input sensor TSU. Fig. 18 is a cross-sectional view of a portion corresponding to line II-II' of Fig. 3.

The display device DS-1 of the exemplary embodiment shown in FIG. 18 includes a display panel DP, a display panel DP including a plurality of organic electroluminescent elements OEL-1, OEL-2, and OEL-3, and a color filter member. The color filter member CFP on the CFP. In the description of the display device DS-1 of the embodiment shown in FIG. 18, the contents described with reference to FIGS. 1 to 10 can be used for the display panel DP and the color filter member CFP in the same manner.

In the display device DS-1 of the exemplary embodiment, the input sensor TSU may be located between the display panel DP and the color filter member CFP. The input sensor TSU can recognize the user's direct touch, the user's indirect touch, the object's direct touch or the object's indirect touch. At the same time, the input sensor TSU can detect at least one of the touch position and strength (pressure) applied from the outside. The input sensor TSU according to some exemplary embodiments of the inventive concept may have various structures or may be formed of various materials, and the inventive concept is not limited to any embodiment. For example, the input sensor TSU in the display device DS-1 according to some exemplary embodiments may be a touch sensor that detects touch.

The input sensor TSU may be directly located on the sealing member TFE of the display panel DP. That is, the input sensor TSU can be directly located on the display panel DP without separating the adhesive member.

The input sensor TSU may be located between the display panel DP and the color filter member CFP. According to some exemplary embodiments, the color filter member CFP may be directly provided on the input sensor TSU.

FIG. 19 is a cross-sectional view illustrating a display device according to some exemplary embodiments. FIG. 20 is a cross-sectional view of the color filter member CFP-e included in the display device of the exemplary embodiment depicted in FIG. 19. Compared with the display device DS of the embodiment described with reference to FIG. 4, the display device DS-2 according to some exemplary embodiments has some differences in the structure of the color filter member CFP-e. Fig. 19 is a cross-sectional view of a portion corresponding to line II-II' of Fig. 3.

The display device DS-2 of the exemplary embodiment shown in FIG. 19 includes a display panel DP having a plurality of organic electroluminescent elements OEL-1, OEL-2, and OEL-3, and is located on a color filter member CFP The color filter member CFP-e. The color filter member CFP-e may include a plurality of color filter portions CCF1, CCF2, and CCF3, and a photoresist portion BM.

In the description of the display device DS-2 of the exemplary embodiment shown in FIG. 19, the contents described with reference to FIGS. 1 to 10 can be similarly applied to the display panel DP, the color filter sections CCF1, CCF2 And CCF3 and photoresist BM.

Referring to FIGS. 19 and 20, according to some exemplary embodiments, the color filter member CFP-e may further include a base substrate WP. The base substrate WP may be located on the color filter portions CCF1, CCF2 and CCF3, and the photoresist portion BM. The base substrate WP may serve as a support substrate on which the color filter portions CCF1, CCF2, and CCF3 and the photoresist portion BM are provided. The base substrate WP may be a glass substrate or a plastic substrate.

The base substrate WP may define the front surface of the display device DS-2. The base substrate WP can stably protect the internal components of the display device DS-2 including the color filter sections CCF1, CCF2, and CCF3 from external impact.

In addition, referring to FIGS. 19 and 20, in the color filter member CFP-c according to some exemplary embodiments, the photoresist portion BM may be located between adjacent color filter portions CCF1, CCF2, and CCF3 without overlapping The color filters CCF1, CCF2, and CCF3. However, the embodiment is not limited to this, and unlike illustrated in the drawings, in the color filter member CFP-c according to some exemplary embodiments, the photoresist portion BM may at least partially overlap adjacent ones The color filters CCF1, CCF2, and CCF3.

In addition, in FIG. 19, each of the color filter portions CCF1, CCF2, and CCF3 may include the matrix portion MR and the scattering agent SP scattered in the matrix portion MR. However, the embodiment is not limited to this, and the third color filter portion CCF3 corresponding to the blue light emitting region PXA-B may not include the scattering agent SP.

The display device according to some exemplary embodiments may include a color filter member on the display panel to reduce reflection due to external light while minimizing the reduction in brightness. Also, in the display device according to some exemplary embodiments, at least one color filter portion among the plurality of color filter portions of the color filter member includes a scattering agent having a diameter of 50 nm or more and 500 nm or less, to Effectively scatters light while minimizing the haze value, so it is possible to reduce chromatic aberration according to viewing angle and display improved display quality.

Further, some embodiments may include a display panel and a color filter member, and the color filter member includes a plurality of color filter parts and an organic layer. By including a scattering agent having a diameter of 50 nm or more and 500 nm or less in at least one of the plurality of color filters and the organic layer, it is possible to provide a color filter and reduce When the display device with improved display quality of the generated color difference is provided, a display device with an improved process is provided.

The display device according to some exemplary embodiments may include a color filter member located on the display panel, and a scattering agent included in the color filter member to reduce reflection due to external light while minimizing reduction in brightness and reducing viewing angle The resulting color difference.

Furthermore, the display device according to some exemplary embodiments may include a scattering agent in at least one of the color filter parts to improve the display quality difference according to the viewing angle.

Although some exemplary embodiments of the inventive concept have been described, it should be understood that the inventive concept should not be limited to these exemplary embodiments, but without departing from the spirit and scope of the inventive concept claimed below , Those with ordinary knowledge in the technical field can make various changes and deformations to it.

BL: Base layer BM: Photoresist section CCF1, CCF2, CCF3: Color filter section CFP, CFP-a, CFP-b, CFP-c, CFP-d, CFP-e: Color filter member DA: Display area DP: Display Panel DP-OEL: Display element layer DP-CL: Circuit layer DR1, DR2, DR3, DR4: Direction axis DS, DS-1, DS-2: Display device D _SP : Diameter EIL: Electron injection layer EL-1, EL -2: electrode EML, EML1, EML2, EML3: light emitting layer ETL: electron transport layer ETR: electron transport area HIL: hole injection layer HTL: hole transport layer HTR: hole transport area I-I', II-II ': Line segment IM: Image IS: Display surface MR: Matrix section NDA: Non-display area NPXA: Non-light-emitting area OC, OL-1, OL-2, OL-3: Organic layer OEL, OEL1, OEL2, OEL3: Organic electric field Light emitting element OH: opening PDL: pixel definition layer PXA-B, PXA-G, PXA-R: light emitting area PXG1, PXG2: group SP: scattering agent TFE: sealing member TSU: input sensor WP: base substrate

The drawings are included to provide a further understanding of the concepts of the invention and are incorporated in and constitute a part of this specification. The drawings illustrate the appearance of some embodiments of the present invention and, together with the description, serve to explain the principles of some exemplary embodiments of the present invention. In the diagram: FIG. 1 is a perspective view of a display device according to some exemplary embodiments; Figure 2 is a cross-sectional view corresponding to the line I-I' of Figure 1; FIG. 3 is a plan view of a display panel according to some exemplary embodiments; FIG. 4 is a cross-sectional view of a display device corresponding to line II-II' of FIG. 3 according to some exemplary embodiments; FIG. 5 is a cross-sectional view of an organic electric field light-emitting element according to some exemplary embodiments; FIG. 6 is a cross-sectional view of a color filter according to some exemplary embodiments; FIG. 7 is a cross-sectional view of a scattering agent according to some exemplary embodiments; Figure 8 is a graph showing the brightness characteristics of the viewing angle according to the size of each scattering agent; FIG. 9 is a cross-sectional view of a color filter according to some exemplary embodiments; FIG. 10 is a cross-sectional view of a color filter according to some exemplary embodiments; Figure 11 is a line graph showing the relationship between frontal brightness and haze value; Figure 12 is a line chart showing the change in front brightness according to the content of the scattering agent; Figure 13 is a graph showing the color difference according to the content of the scattering agent; FIG. 14 is a graph showing the color difference according to the thickness of the color filter; FIG. 15 is a cross-sectional view of a color filter according to some exemplary embodiments; FIG. 16 is a cross-sectional view of a color filter according to some exemplary embodiments; Figure 17 is a graph showing the color difference according to the viewing angle; FIG. 18 is a cross-sectional view of a display device according to some exemplary embodiments; FIG. 19 is a cross-sectional view of a display device according to some exemplary embodiments; and FIG. 20 is a cross-sectional view of a color filter according to some exemplary embodiments.

BL: basal layer

BM: photoresist

CCF1, CCF2, CCF3: color filter

CFP: color filter

DP-OEL: display element layer

DP-CL: circuit layer

EL1, EL2: circuit layer

EML1, EML2, EML3: light emitting layer

ETR: electron transport layer

HIL: hole injection layer

HTR: hole transmission area

NPXA: non-luminous area

OC, OL-1, OL-2, OL-3: organic layer

OEL1, OEL2, OEL3: organic electric field light-emitting element

OH: opening

PDL: pixel definition layer

PXA-B, PXA-G, PXA-R: light emitting area

TFE: Sealing member

Claims (19)

A display device comprising: A display panel containing organic electroluminescent elements; and A color filter on the display panel and including a plurality of color filter parts spaced apart from each other on a plane, Wherein, at least one of the plurality of color filter portions includes a scattering agent having an average diameter of 50 nanometers (nm) or more and 500 nm or less. The display device as described in item 1 of the patent application scope, wherein the plurality of color filter parts include: A first color filter configured to transmit light in a first wavelength range; and A second color filter is configured to transmit light in a second wavelength range different from the first wavelength range. The display device as described in item 1 of the patent application scope, wherein the color filter includes: A first color filter configured to transmit red light; and A second color filter, configured to transmit green light, Wherein, the first color filter portion and the second color filter portion include the scattering agent. The display device according to item 3 of the patent application scope, wherein the color filter further includes a third color filter portion, wherein the third color filter portion includes the scattering agent. The display device as described in item 4 of the patent application range, wherein the third color filter portion is formed of a transparent photoresist resin. The display device as described in item 4 of the patent application scope, wherein the third color filter portion transmits blue light. The display device as described in item 4 of the patent application range, wherein a first content of the scattering agent contained in the first color filter is greater than or equal to a first content of the scattering agent contained in the second color filter The second content and a third content of the scattering agent contained in the third color filter. The display device as described in item 7 of the patent application range, wherein the first content is greater than the third content. A display device as described in item 3 of the patent application range, wherein based on the total weight of the first color filter part, a first content of the scattering agent contained in the first color filter part is greater than 0 wt% and less than or equal to 10 wt%. The display device as described in item 1 of the patent application range, wherein the scattering agent comprises at least TiO ₂ , ZnO, Al ₂ O ₃ , SiO ₂ , hollow silica and polystyrene particles One of the particles. The display device as described in item 1 of the patent application range, wherein the color filter further includes an organic layer on the plurality of color filters, wherein the organic layer includes the scattering agent. The display device as described in item 11 of the patent application range, wherein based on the total weight of the at least one color filter part, a content of the scattering agent in the at least one color filter part is greater than 0 wt% and less than or equal to 10 wt% , Wherein, based on the total weight of the organic layer, a content of the scattering agent in the organic layer is 5 wt% or more and 50 wt% or less. The display device as described in item 7 of the patent application range, wherein the color filter further includes an organic layer on the plurality of color filter portions, and a fourth content of the scattering agent in the organic layer is greater than the Each of the first content, the second content, and the third content. The display device as described in item 1 of the patent application range, wherein the color filter further includes a photoresist portion between the plurality of color filter portions. The display device as described in item 1 of the patent application range, wherein the display panel further includes a sealing member on the organic electric field light-emitting element. The display device as described in item 15 of the patent application scope, wherein the color filter is directly provided on the sealing member. The display device as described in item 15 of the patent application scope, which further includes an input sensor between the sealing member and the color filter, Wherein, the color filter is directly set on the input sensor. The display device as described in item 1 of the patent application range, wherein the color filter further includes a base substrate on the plurality of color filter portions. The display device as described in item 1 of the patent application range, wherein the haze value in each of the plurality of color filters is 30% or less.

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