CN115152044A - Color conversion pixel, composition for color conversion pixel, and display device including the color conversion pixel - Google Patents

Color conversion pixel, composition for color conversion pixel, and display device including the color conversion pixel Download PDF

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CN115152044A
CN115152044A CN202080097351.2A CN202080097351A CN115152044A CN 115152044 A CN115152044 A CN 115152044A CN 202080097351 A CN202080097351 A CN 202080097351A CN 115152044 A CN115152044 A CN 115152044A
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pixel
color
color conversion
conversion pixel
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金勋植
明重在
朴瑟奇
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Dongwoo Fine Chem Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/115—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B57/00—Other synthetic dyes of known constitution
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S977/00—Nanotechnology
    • Y10S977/70—Nanostructure
    • Y10S977/773—Nanoparticle, i.e. structure having three dimensions of 100 nm or less
    • Y10S977/774—Exhibiting three-dimensional carrier confinement, e.g. quantum dots

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  • Optical Filters (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

Provided are a color conversion pixel including a quantum dot and a color material, a composition for the color conversion pixel, and a display device including the color conversion pixel.

Description

Color conversion pixel, composition for color conversion pixel, and display device including color conversion pixel
Technical Field
The invention relates to a color conversion pixel comprising quantum dots and color materials A composition for a color conversion pixel and a display device including the color conversion pixel.
Background
Recent display devices include Liquid Crystal Displays (LCDs), organic electroluminescent display devices (OLEDs), and the like. The manner differs in the manner in which each pixel is driven. To display a dynamic picture, the LCD uses a material called liquid crystal to control the color represented by each pixel, and the OLED implements a plurality of pictures over time by implementing colors in the pixels by applying current to each pixel to generate light. In addition, the existing LCD may be different depending on whether the light source is used as CCFL (cold cathode fluorescent lamp) or LED (light emitting diode), the OLED may also be divided into an RGB OLED generating colors independently per pixel and a WOLED (white OLED) combined with a Color Filter (CF).
In order to realize a desired color, a light source and an appropriate color filter are required, and a method of using a coloring material such as a pigment or a dye as a colorant is generally employed at present. In the related art, a color material for a display device utilizes transmission and absorption characteristics of a specific wavelength, for example, pigment Red 254 (c.i. pigment Red 254) which is a color material having a Red color has absorption characteristics in a blue region and a green region, and has transmission characteristics in a Red region, and thus may be recognized as Red in a general visible light region (wavelength range: 380 to 780 nm). However, when the pigment is used alone, it is difficult to satisfy high quality requirements such as high brightness, high contrast, high definition, and the like, and when the dye is used alone, there is a disadvantage that heat resistance and light resistance are lowered.
On the other hand, quantum dots which have been much studied recently are particles having special characteristics due to their size as small as several nanometers, and EL characteristics for generating light by injecting electricity are studied in addition to PL characteristics which exhibit characteristics of receiving light and emitting light at a longer wavelength. Due to the above characteristics, many studies have been made to utilize quantum dots as display materials. In the early stage of research, a sheet including quantum dots was developed and a structure using an existing color filter by converting a blue light source into a white light source was studied, and recently, a color conversion characteristic for each pixel was studied. For example, as in korean patent application laid-open No. 10-2018-0030353 directed to a photoresist composition and a color filter using the same, the following methods were studied: the blue pixel presents the blue light source of the light source as it is, the green quantum dot pixel presents the blue light source as the green light source, and the red quantum dot pixel presents the blue light source as the red light source.
However, if the known color conversion pixel has no partition, blue light of the backlight unit flows out to an adjacent pixel to emit blue light leaked from the red pixel or light converted into red due to the leaked blue light encountering a red quantum dot is generated, and even in the blue pixel, since blue light generated for a green quantum dot leaks from the green pixel to the adjacent blue pixel and out of the pixel, there is a problem that light leaks to the adjacent pixel in the case of using the existing color conversion pixel. Therefore, in order to prevent interference from these adjacent pixels, it is necessary to form a partition wall between the respective pixels to prevent color mixing due to leakage of light. The partition walls used in the related art are required to prevent light leakage, and thus generally have black color, but it is difficult to manufacture the black partition walls in a thick pattern. Further, since the partition wall is formed, there is a problem that the aperture ratio of the pixel inevitably decreases due to the area of the partition wall. Therefore, in order to improve the performance of each color conversion pixel, it is necessary to develop a high-purity pixel that minimizes interference between pixels and does not cause color mixing even without a partition wall.
Disclosure of Invention
Technical problem
The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a color conversion pixel that minimizes interference between pixels and does not cause color mixing even without a partition wall and exhibits color purity, a composition for manufacturing the color conversion pixel, and a display device including the color conversion pixel.
Technical scheme
In order to achieve the above object, the present invention provides a color conversion pixel including quantum dots and a color material.
Furthermore, the present invention provides a composition for a color conversion pixel, comprising: quantum dots; a color material having a transmittance of 50% or more in at least two wavelength regions of 450nm, 540nm, and 640 nm; a monomer; a binder; an initiator; and an additive.
In addition, the present invention provides a display device including the color conversion pixel.
Effects of the invention
The color conversion pixel of the present invention includes quantum dots and a color material having high transmittance to a specific wavelength region, thereby providing the following effects: light interference between each pixel is minimized, and color mixing is not caused and the purity of color can be improved even without a partition wall. .
In addition, since the partition wall is not required to be formed, the manufacturing process of the color filter is simplified, and thus the aperture ratio of the pixel can be increased, and the pixel can be manufactured.
Drawings
Fig. 1 is a schematic diagram of a structure of a color conversion pixel according to the present invention.
Fig. 2 is a graph of transmittance according to wavelength of color materials included in a color conversion pixel according to the present invention, according to an embodiment of the present invention.
Fig. 3 shows the transmission spectra of common blue, green and red pigments.
Detailed Description
Best mode for carrying out the invention
The present invention relates to a color conversion pixel including a quantum dot and a color material, a color filter including the color conversion pixel, and a display device including the color filter, and the color conversion pixel of the present invention may refer to a blue pixel, a green pixel, or a red pixel of the color filter.
The color conversion pixel of the present invention includes quantum dots and a color material having high transmittance to a specific wavelength region, thereby providing the following effects: light interference between each pixel is minimized, and color mixing is not caused and the purity of color can be improved even without a partition wall.
Further, the color filter including the color conversion pixel of the present invention does not require formation of a partition wall between each pixel, and therefore the process is simplified, whereby the aperture ratio of the pixel can be increased, and by suppressing light emission of quantum dots from an external light source, a pixel which converts a color into a color of high purity can be manufactured, and a display device including such a color conversion pixel can be manufactured.
The color material exhibits transmission and absorption characteristics at a specific wavelength, for example, a red color material has transmission characteristics in a red region (600 nm or more) and thus can be recognized in a general visible light region (wavelength range: 380 to 780 nm), but exhibits absorption characteristics in other wavelength ranges. In addition, similarly, the green color material has a transmission characteristic in a green region (500 to 560 nm), and thus can be recognized as green in a visible light region, but exhibits an absorption characteristic in other wavelength regions.
On the other hand, the quantum dots convert blue light into light of a specific wavelength (convert light of a short wavelength into light of a long wavelength), the red quantum dots serve to absorb blue light from the red pixels and convert it into red light, and the green quantum dots absorb blue light from the green pixels and convert it into green light.
When a general color material is introduced to improve the color purity performance of a pixel including quantum dots, for example, when a pixel is manufactured using both a red quantum dot and a red color material, since the red color material has absorption characteristics for blue and green as described above, the red color material absorbs and interferes with blue light that the red quantum dot should absorb, thereby deteriorating the performance of the pixel instead. Therefore, it is not preferable to use a color material, which is generally used in a red or green pixel, together with quantum dots as a composition for manufacturing a color conversion pixel.
Accordingly, the color conversion pixel of the present invention includes a color conversion pixel including quantum dots and a color material, and specifically includes a color conversion pixel including quantum dots and a color material capable of preventing color mixing between pixels, and more specifically includes a color conversion pixel including quantum dots and a color material having high transmittance to two specific wavelength regions. Therefore, the color purity of each pixel can be improved even without a partition wall, and an effect of preventing color mixing can be obtained, and by using such a color conversion pixel, a display device having an improved color can be provided.
< color conversion pixel >
The color conversion pixel of the present invention includes a color conversion pixel including quantum dots and a color material, and preferably includes quantum dots and a color material having high transmittance for two specific wavelength regions.
Quantum dots
The color conversion pixel of the present invention includes quantum dots.
The quantum dot of the present invention is not particularly limited as long as it is a quantum dot particle that can emit light by optical or electrical stimulation. For example, it may be selected from the group consisting of: II-VI semiconductor compounds; III-V semiconductor compounds; group IV-VI semiconductor compounds; a group IV element or a compound containing the element; and combinations thereof, which may be used alone or in admixture of two or more.
For example, the II-VI semiconductor compounds may include: a binary compound selected from the group consisting of CdS, cdSe, cdTe, znS, znSe, znTe, znO, hgS, hgSe, hgTe and mixtures thereof; a ternary compound selected from the group consisting of CdSeS, cdSeTe, cdSTe, znSeS, znSeTe, znSTe, hgSeS, hgSeTe, hgSTe, cdZnS, cdZnSe, cdZnTe, cdHgS, cdHgSe, cdHgTe, hgZnS, hgZnSe, hgZnTe, and mixtures thereof; and a quaternary compound selected from the group consisting of CdZnSeS, cdZnSeTe, cdHgSeS, cdHgSeTe, cdHgSTe, hgZnSeS, hgZnSeTe, and mixtures thereof, but not limited thereto.
The group III-V semiconductor compounds may include: a binary compound selected from the group consisting of GaN, gaP, gaAs, gaSb, alN, alP, alAs, alSb, inN, inP, inAs, inSb, and mixtures thereof; a ternary compound selected from the group consisting of GaNP, gaNAs, gaNSb, gaPAS, gaPSb, alNP, alNAs, alNSb, alPAs, alPSb, inNP, inNAs, inNSb, inPAs, inPSb, gaAlNP, and mixtures thereof; and quaternary compounds selected from the group consisting of GaAlNAs, gaAlNSb, gaAlPAs, gaAlPSb, gainp, gaInNAs, gainsb, gaInPAs, gaInPSb, inalnps, inalnnas, inAlNSb, inalnpas, inAlNSb and mixtures thereof, but not limited thereto.
The group IV-VI semiconductor compounds may include: a binary compound selected from the group consisting of SnS, snSe, snTe, pbS, pbSe, pbTe and mixtures thereof; a ternary compound selected from the group consisting of SnSeS, snSeTe, snSTe, pbSeS, pbSeTe, pbSTe, snPbS, snPbSe, snPbTe and mixtures thereof; a quaternary compound selected from the group consisting of, but not limited to, snPbSSe, snPbSeTe, snPbSTe, and mixtures thereof.
Although not limited thereto, the group IV element or the compound containing the element may be selected from the group consisting of: an element selected from the group consisting of Si, ge, and mixtures thereof; and a binary compound selected from the group consisting of SiC, siGe, and mixtures thereof.
The quantum dots have a uniform single structure; core-shell structure, gradient structure and other double structures; or a mixed structure thereof, and in the present invention, the quantum dots are not particularly limited as long as they can emit light by stimulation of light.
According to one embodiment, the quantum dot has a core-shell structure, and the core may include at least one selected from the group consisting of InP, inZnP, inGaP, cdSe, cdS, cdTe, znS, znSe, znTe, cdSeTe, cdZnS, cdSeS, pbSe, pbS, pbTe, aginnzns, hgS, hgSe, hgTe, gaN, gaP, gaAs, inGaN, inAs, and ZnO, and the core may include at least one selected from the group consisting of ZnS, znSe, znTe, znO, cdS, cdSe, cdTe, cdO, inP, inS, gaP, gaN, gaO, inZnP, inGaP, inGaN, inznssce, pbS, tiO, srSe, and HgSe, and preferably, may include at least one selected from the group consisting of InP/InP, inP/ZnS, inP/ZnSe, inP/GaP/ZnS/se, inGaN, znSe/ZnS/te, and MnSe.
Generally, quantum dots can be manufactured by a wet chemical process, a metal organic chemical vapor deposition process (MOCVD), or a molecular beam epitaxy process (MBE).
The wet chemical process is a method of growing particles by putting a precursor substance into an organic solvent, and when the crystal grows, the organic solvent is naturally coordinated on the surface of the quantum dot crystal, functioning as a dispersant, controlling the growth of the crystal, and thus the size growth of the quantum dot particles can be controlled by a process easier and cheaper than a vapor deposition method such as organic metal chemical vapor deposition or molecular beam epitaxy.
Green, red, and blue quantum dots may be used, respectively, according to the respective manufacturing purposes of the green, red, and blue pixels.
Specifically, the quantum dot may be a green quantum dot, which refers to a substance for absorbing blue light and converting it into green light, and in general, any quantum dot substance used for manufacturing a green pixel may be applied without limitation. For example, the center wavelength of the green quantum dots may be 500 to 560nm, preferably 520 to 550nm, and most preferably about 540nm.
Further, the quantum dot may be a red quantum dot, which refers to a substance for absorbing blue light and converting it into red light. In general, any quantum dot substance can be used without limitation as long as it is a substance for manufacturing a red pixel. For example, the center wavelength of the red quantum dots may be 600nm or more, preferably 600nm to 700nm, and most preferably about 640nm.
The quantum dot may be a blue quantum dot, which is a substance for emitting blue light, and in general, any quantum dot substance may be used without limitation as long as it is a quantum dot substance for producing a blue pixel. For example, the central wavelength of the blue quantum dots may be 500nm or less, preferably 400nm to 500nm, and most preferably about 450nm.
Color material
The color conversion pixel of the present invention includes a color material.
The color material preferably has a transmittance of 50% or more, more preferably 60% or more, and most preferably 70% or more in at least two wavelength regions of 450nm, 540nm, and 640nm. The color material has a transmittance of 50% or less, preferably 30% or less, and most preferably 5% or less, in at least one region of 450nm, 540nm, and 640nm.
The color material of the present invention has a transmittance of 50% or more, more preferably 60% or more, and most preferably 70% or more, in at least two wavelength regions of 450nm, 540nm, and 640nm, and has a transmittance of 50% or less, preferably 30% or less, and most preferably 5% or less, in one region.
The color material has a transmittance of 50% or more, more preferably 60% or more, and most preferably 70% or more in the wavelength region of 450nm and 540nm, and has a transmittance of 50% or more, more preferably 60% or more, and most preferably 70% or more in the wavelength region of 450nm and 640nm.
The transmittance of the color material according to the embodiment of the present invention according to the wavelength is shown in fig. 2.
Specifically, when the quantum dot is a green quantum dot, the color material may have a transmittance of 50% or more in a wavelength region of 450nm and 540nm and a transmittance of 50% or less in a wavelength region of 640nm, and is preferably a cyan color material, and in this case, the color conversion pixel of the present invention may be a green pixel. The cyan color material may be used without limitation as long as it is a known color material recognized as cyan in the visible light region, and includes a cyan pigment and a cyan dye. For example, the cyan dye may be Acid Blue 90 (Acid Blue 90), acid Blue G4061 (Sinochem titanium in Imp Exp Corp), acid Blue GN (Jagson color Ltd), acid Brilliant Blue G (Acid Brilliant Blue G) (Sinochem Ningbo & Exp Corp), acid Brilliant Blue G (Nanjing chemical inport and Exp Corp), acid Brilliant Blue G (bright color BV), etc., and the cyan pigment may be Polar Blue G (Polar Blue G) (gasoline Specialty Chemicals), polar Blue G-Ol (gasoline Blue G), ricollan Blue G (ricoll Blue G) (rich Blue color Inc), etc. (rich Blue Inc).
For example, in a green pixel of one embodiment, the color material absorbs red light, transmits blue and green light, and converts the blue light transmitted through the green quantum dots to green light, thereby improving the color purity of the green pixel.
In addition, when the quantum dot is a red quantum dot, the color material may have a transmittance of 50% or more in a wavelength region of 450nm and 640nm and a transmittance of 50% or less in a wavelength region of 540nm, and is preferably a magenta color material, and in this case, the color conversion pixel of the present invention may be a red pixel. The magenta color material may be used without limitation as long as it is a known color material recognized as magenta in the visible light region, and includes a magenta dye and a magenta pigment. For example, the Magenta dye may include acid Magenta IIS (British dyes Corporation, BDC), magenta S (Magenta S) (interassan Gemeinschaft Farbenindustrie a.g., IG), etc., magenta pigment Diamond Magenta I (Diamond Magenta I), magenta a pdr Magenta AB pdr (Magenta a pdr Magenta AB pdr) (dye industry interest group), etc.
For example, in a red pixel of one embodiment, the color material absorbs green light, transmits blue and red light, and converts the blue light transmitted through the red quantum dots to red light, thereby improving the color purity of the red pixel.
< construction of color conversion pixel >
The above-described color conversion pixel of the present invention may be prepared from a composition for a color conversion pixel including quantum dots and a color material, and the composition for a color conversion pixel of the present invention may include one or more of a monomer, a binder, an initiator, an additive, and a solvent in addition to the quantum dots and the color material.
Quantum dots
The description of the above quantum dots in a color conversion pixel applies equally to the composition for a color conversion pixel.
The content of the quantum dots may be 5 to 40% by weight, preferably 10 to 30% by weight, with respect to the solid components in the composition for color conversion pixels.
Color material
The description of the above color materials in the color conversion pixel can be equally applied to the composition for the color conversion pixel.
The content of the color material may include the color material in an amount of 1 to 20% by weight, preferably 1.5 to 10% by weight, with respect to the solid content in the composition for color conversion pixels.
Monomer
The color conversion pixel according to the embodiment of the present invention may further include a single body. The monomer imparts appropriate viscosity characteristics to the composition, and a structure is formed by the monomer from a radical generated by an initiator described later.
The monomer is at least one selected from the group consisting of: trimethylolpropane tri (meth) acrylate, ethoxylated trimethylolpropane tri (meth) acrylate, propoxylated trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, ethoxylated pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, ethoxylated dipentaerythritol hexa (meth) acrylate, propoxylated dipentaerythritol hexa (meth) acrylate and dipentaerythritol (poly) acrylate, it is preferred to use dipentaerythritol hexaacrylate.
The content of the monomer may be 20 to 60% by weight, preferably 25 to 50% by weight, with respect to the solid content in the composition for color conversion pixels.
Adhesive agent
The color conversion pixel according to an embodiment of the present invention may further include an adhesive.
The adhesive may include an acrylic adhesive resin, a cardo (cardo) -based adhesive resin, an epoxy resin, or a combination thereof, for example, a resin having a structure represented by the following chemical formula 1 is preferably used, but not limited thereto.
[ chemical formula 1]
Figure BDA0003809573850000091
In the chemical formula 1, p is an integer of 3 to 15, and is a bond.
The content of the binder may be 20 to 60 wt%, preferably 25 to 50 wt%, with respect to the solid components in the composition for color conversion pixels.
Initiator
The color conversion pixel according to an embodiment of the present invention may further include an initiator.
In one embodiment of the present invention, the initiator may be used without particular limitation in its type as long as it can polymerize the monomer. Specifically, from the viewpoints of polymerization characteristics, initiation efficiency, absorption wavelength, availability, price, and the like, it is preferable to use at least one compound selected from the group consisting of acetophenone-based compounds, benzophenone-based compounds, triazine-based compounds, biimidazole-based compounds, oxime-based compounds, and thioxanthone-based compounds as the initiator.
The initiator may be present in an amount of 1 to 10 wt%, preferably 1.5 to 5 wt%, relative to the total content of the composition for the color conversion pixel.
Additive agent
The color conversion pixel according to an embodiment of the present invention may further include an additive.
The additive may include, for example, at least one selected from the group consisting of other high molecular compounds, epoxy additives (curing agents), leveling agents, and the like.
Specific examples of the other polymer compound include curable resins such as epoxy resins and maleimide resins; and thermoplastic resins such as polyvinyl alcohol, polyacrylic acid, polyethylene glycol monoalkyl ether, polyfluoroalkyl acrylate, polyester, and polyurethane.
The curing agent is used for deep curing and improving mechanical strength, and specific examples thereof include epoxy compounds, polyfunctional isocyanate compounds, melamine compounds, oxetane compounds, and the like.
Specific examples of the epoxy compound in the curing agent include bisphenol a epoxy resins, hydrogenated bisphenol a epoxy resins, bisphenol F epoxy resins, hydrogenated bisphenol F epoxy resins, novolac epoxy resins, other aromatic epoxy resins, alicyclic epoxy resins, glycidyl ester-based resins, glycidyl amine-based resins, or brominated derivatives of these epoxy resins, aliphatic, alicyclic, or aromatic epoxy compounds other than epoxy resins and brominated derivatives thereof, butadiene (co) polymer epoxides, isoprene (co) polymer epoxides, glycidyl (meth) acrylate (co) polymers, triglycidyl isocyanurate, and the like.
The curing agent may be used together with the curing agent with a curing auxiliary compound capable of ring-opening polymerizing the epoxy group of the epoxy compound, the oxetane skeleton of the oxetane compound. The curing auxiliary compound includes, for example, a polycarboxylic acid, a polycarboxylic anhydride, and an acid generator. As the polyvalent carboxylic acid anhydride, a commercially available one can be used as the epoxy resin curing agent. Specific examples of the epoxy resin curing agent include a trade name (Adecahadona EH-700) (manufactured by Adeka industries Co., ltd.), a trade name (Rikasiddo HH) (manufactured by Shin Nippon EWha Co., ltd.), a trade name (MH-700) (manufactured by Shin Nippon EWha Co., ltd.), and the like. The curing agents exemplified above may be used singly or in combination of two or more.
As the leveling agent, a commercially available surfactant can be used to further improve the film forming property of the black photosensitive resin composition, and examples thereof include surfactants such as silicone type, fluorine type, ester type, cationic type, anionic type, nonionic type, amphoteric type, and the like, and these surfactants may be used alone or in combination of two or more kinds.
The skilled person can appropriately add and use the additive within a range not affecting the effect of the present invention. For example, with respect to the solid components in the composition for color converting pixels, the content of the additive may be 0.1 to 3% by weight, preferably 0.2 to 1% by weight.
Solvent(s)
The color conversion pixel according to an embodiment of the present invention may further include a solvent.
As long as the solvent is effective to dissolve other ingredients contained in the composition for color conversion pixels, a solvent generally used in the art may be used without particular limitation. Specific examples of the solvent may be one or more selected from ethers, acetates, aromatic hydrocarbons, ketones, alcohols, esters, amides, and the like, but are not limited thereto.
Specific examples of the ether solvent include: ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monobutyl ether; propylene glycol monoalkyl ethers such as propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether and propylene glycol monobutyl ether; diethylene glycol dialkyl ethers such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, and diethylene glycol dibutyl ether.
Specific examples of the acetate solvent include: alkylene glycol alkyl ether acetates such as methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, and propylene glycol monopropyl ether acetate; alkoxyalkyl acetates such as methoxybutyl acetate, methoxyamyl acetate, and n-amyl acetate.
Specific examples of the aromatic hydrocarbon solvent include: benzene, toluene, xylene, mesitylene, and the like.
Specific examples of the ketone solvent include: methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone, cyclohexanone, and the like.
Specific examples of the alcohol solvent include: ethanol, propanol, butanol, hexanol cyclohexanol, ethylene glycol, glycerol, and the like.
Specific examples of the ester solvent include: cyclic esters such as γ -butyrolactone; ethyl 3-ethoxypropionate, methyl 3-methoxypropionate, ethyl 3-ethoxypropionate, and the like.
Specific examples of the amide-based solvent include: n, N-dimethylformamide, N-dimethylacetamide, N-methylpyrrolidone, and the like.
The solvent is preferably propylene glycol monomethyl ether acetate, but is not limited thereto.
The content of the solvent may be 100 to 400 wt%, preferably 150 to 300 wt%, with respect to the solid components in the composition for color conversion pixels.
< color filter and display device >
The present invention relates to a color filter including the above color conversion pixel and a display device including the color filter. Further, the display device and the color filter of the present invention can apply all of the above-described descriptions of the color conversion pixels, and although detailed descriptions of overlapping parts are omitted, the same description can be applied even if the descriptions are omitted.
Referring to fig. 1, a color filter included in a display device of the present invention includes first, second, and third pixels 21, 22, and 23 for forming different colors on a substrate 10, and at least one of the first to third pixels may be a color conversion pixel according to the present invention. For example, when light (e.g., blue light) 30 from the outside is incident on the color filter, red light, green light, and blue light may be emitted from the first pixel region, the second pixel region, and the third pixel region, respectively.
In one embodiment, as shown in fig. 1, the color filter is formed with a blue pixel 21, a green pixel 22, and a red pixel 23, and preferably, the green pixel 22 and/or the red pixel 23 are color conversion pixels according to the present invention, and the green pixel 22 and the red pixel 23 are both color conversion pixels according to the present invention.
In one embodiment, the color filter is formed with blue pixels 21, green pixels 22, and red pixels 23, and preferably, the blue pixels 21, the green pixels 22, and/or the red pixels 23 are color conversion pixels according to the present invention, and the blue pixels 21, the green pixels 22, and the red pixels 23 are color conversion pixels according to the present invention.
Since the color filter of the present invention includes the color conversion pixel according to the present invention, it may not include: the partition walls for dividing the first pixel 21, the second pixel 22, and the third pixel 23 are provided between them, and the substrate 10 is a transparent substrate preferably made of glass or the like.
In one embodiment, as shown in fig. 1, the color filter may not include: the partition walls for dividing the blue pixel 21, the green pixel 22, and the red pixel 23 are provided between them.
Further, the present invention provides a display device including the color filter. The display device according to the present invention may apply all structures known in the art except for using the color filter according to the present invention.
In one embodiment, a display device of the present invention includes a liquid crystal panel having a lower substrate, an upper substrate, and a liquid crystal layer disposed between the lower substrate and the upper substrate facing each other, and a backlight device providing light. An image is formed to a liquid crystal panel and a color filter that converts the wavelength of light emitted from a backlight device and transmitted through the liquid crystal panel to form a color. In addition, the backlight device may include a light source 30 emitting blue light to provide the liquid crystal panel with the blue light.
Modes for carrying out the invention
Hereinafter, preferred embodiments, comparative examples and experimental examples are presented to aid in understanding the present invention, but these embodiments, comparative examples and experimental examples are only for illustrating the present invention and do not limit the appended claims, and it is apparent to those skilled in the art that various changes and modifications of the embodiments, comparative examples and experimental examples may be made within the scope and technical spirit of the present invention, and it is apparent that these modifications and modifications fall within the scope of the appended claims.
Preparation examples 1 to 9: preparation of composition for color converting pixels
The compositions prepared according to the compositions of preparation examples 1 to 9 were sequentially added with a solvent, a color material, quantum dots, a monomer, a binder, an initiator, an epoxy resin, and an additive in the contents of table 1, and mixed by rotating at 300rpm for 30 minutes to prepare compositions for color conversion pixels.
In this preparation example, in order to prepare a composition for blue conversion pixels, prepared were: using TiO 2 A white photosensitive resin composition as a scatterer (preparation example 1); using TiO 2 A blue-white photosensitive resin composition as a scatterer and containing a preparation blue pigment (preparation example 2); and the transparent organic composition of preparation example 3.
[ TABLE 1]
Figure BDA0003809573850000131
Figure BDA0003809573850000141
White pigment: pigment white 6 (product TR-88 from DuPont) blue pigment: pigment blue 15, xcolor pigment company
Cyan pigment: BCG company products
Green pigment Green 58
Magenta dye: saujanya dyskuff corporation
Red pigment, pigment Red 254
Green Quantum Dots (GQD): quantum dots of Nanolumi company, center wavelength 530nm, FWHM 30nm
Red Quantum Dots (RQD): nanolumi Quantum dots with center wavelength 640nm, FWHM 38nm
Monomer (b): dipentaerythritol hexaacrylate (DPHA, nippon Kabushiki Kaisha)
Adhesive: synthesis example 1 adhesive of chemical formula 2
Initiator: irgacure OXE03 (BASF corporation)
Epoxy resin: diethylene glycol diglycidyl ether (Daicel)
Additive: flatting agent (F475, DIC Co.)
Solvent: propylene Glycol Monomethyl Ether Acetate (PGMEA)
Synthesis example 1: synthesis of Binder resin of chemical formula 2
A white solid powder of the following chemical formula 1-1 was put into a three-necked flask, and 27g of thiophenol and 32g of ethanol were put into the flask and stirred.
[ chemical formula 1-1]
Figure BDA0003809573850000151
16.3g of trimethylamine were slowly added dropwise to the reaction solution. After completion of the reaction, ethanol was removed by distillation under reduced pressure, and the organic matter was dissolved in dichloromethane, washed with water, and then dichloromethane was removed by distillation under reduced pressure. A three-necked flask was charged with an equal amount of PGMEA solvent to prepare a 50% solution, which was then warmed to 115 ℃. 31.1g of 3,3', 4' -biphenyltetracarboxylic dianhydride was added dropwise at 115 ℃ and stirred for 6 hours while maintaining 118 ℃. After 7.35g of phthalic anhydride was placed and stirred for a further 2 hours, the reaction was terminated. After cooling, the resin of the following chemical formula 1 having a weight average molecular weight of 4,300g/mol was obtained.
[ chemical formula 1]
Figure BDA0003809573850000161
Examples and comparative examples: preparation of color conversion pixels
By forming a pattern by a photolithography process using the composition prepared in the above preparation example, color conversion pixels respectively including blue pixels, green pixels, and red pixels were manufactured as shown in table 2 below.
In the photolithography, the surface of a glass substrate (Eagle 2000, manufactured by corning corporation) was washed with a neutral detergent, water, and alcohol in this order, coated on the glass substrate using a coater (Mikasa corporation, optical coat MS-a 150) according to the structure configured in examples 1 to 7 and comparative examples 1 to 4 in the following table 2 so that each composition has a certain thickness of rpm, and then pre-baked on a hot plate at 90 ℃ for 1 to 10 minutes to form a coating film.
Then, after a mask for forming a pattern was inserted on the coating film, the resultant was exposed to light at 200mJ/cm using an exposure machine (Ushio Co., HB-50110 AA) 2 Under the exposure conditions of (1) (by a 365nm sensor), pattern exposure was performed by a colleague who performed UV irradiation. After the above exposure, unnecessary portions were dissolved and removed with an aqueous developer solution to leave only the exposed portions to form a pattern, and heat curing was performed in a convection oven at a temperature of 130 ℃ for 60 minutes to complete sample fabrication. In the pixel, a substrate is formed without forming a partition in the order of forming a blue pixel, forming a red pixel, and forming a green pixel, and a schematic structural view is shown in fig. 1.
[ TABLE 2 ]
Figure BDA0003809573850000162
Figure BDA0003809573850000171
A general quantum dot pixel is used to absorb light generated from a blue light source to generate long-wavelength light, and as comparative examples 1 and 2, a photosensitive resin composition was prepared by: the green pixel uses quantum dots that absorb light generated from the blue light source to generate light of a green wavelength, and the red pixel uses quantum dots that absorb light generated from the blue light source to generate light of a red wavelength.
< test example >
For the color conversion pixels according to the prepared examples and comparative examples, performance evaluations were performed as follows, and the results are shown in table 3.
Test example 1: brightness assessment
Green (green luminance) to red (red luminance) were driven, and the spectrum of the substrate was measured on the upper portion of the substrate using a CAS 140CT apparatus. The wavelengths of desired colors were calculated as area ratios, and the results of comparative examples 1 to 4 and examples 1 to 7 were measured according to the following classifications and are shown in table 3.
Very good: when the brightness of green to red is 80% or more as compared with that of blue
O: when the brightness of green to red is 60% or more as compared with blue
And (delta): when the brightness of green to red is 40% or more compared with blue
X: when the brightness of green to red is 25% or less as compared with that of blue
Test example 2: evaluation of color purity
Green (green purity) to red (red purity) was driven, and the spectrum of the substrate was measured on the top of the substrate using a CAS 140CT apparatus. The wavelengths other than the wavelength of the desired color were calculated as area ratios, and the results of comparative examples 1 to 4 and examples 1 to 7 were measured according to the following classifications and are shown in table 3.
Very good: when the wavelength other than the desired color is 0.1% or less
O: wavelengths other than the desired color are more than 0.1% and not more than 1%
And (delta): wavelengths other than the desired color are more than 1% and not more than 3%
X: wavelengths other than the desired color are greater than 3%
Test example 3: sharpness evaluation
In order to evaluate the definition between pixels, a specific pixel was driven, the definition was evaluated by evaluating the intensity of light generated from the neighboring pixels, and the results thereof are shown in table 3.
The green/red definition was evaluated by the intensity of light generated by the adjacent red pixel after driving the green pixel, and the green/blue definition was evaluated by the intensity of light generated by the adjacent blue pixel after driving the green pixel, as follows.
Very good: when the intensity of the generated light is 0.1% or less as compared with the intensity of green light
O: when the intensity of the light emitted is more than 0.1% and 1% or less of the green light intensity
And (delta): when the intensity of the light emitted is more than 1% and 3% or less of the green light intensity
X: greater than 3% intensity compared to green light intensity
[ TABLE 3 ]
Figure BDA0003809573850000191
When the blue light source at the back of the green pixel is driven to realize green, the blue light source is generated in the backlight unit (BLU), the blue light source is converted into green in the green pixel to display green, however, when the color conversion pixel is configured as in comparative examples 1 and 2 without forming a partition wall, the blue light from the backlight unit flows out to the adjacent pixel to emit the blue light from the red pixel or to generate the light converted into red by encountering the red quantum dot, and further, even in the blue pixel, the blue light generated in the green pixel leaks into the adjacent blue pixel, as can be confirmed with reference to table 3, the color quality is deteriorated due to the above problems, and the definition between the pixels is lowered in comparative examples 1 and 2 in which only the quantum dot is introduced into the green and red pixels.
In addition, when a color material is introduced into the quantum dots, if the color conversion pixels are configured by introducing the same color material as that of each pixel as in comparative examples 3 and 4, the efficiency of the quantum dots is reduced because the blue light that should be absorbed by the quantum dots is absorbed by the color material, and as a result, the luminance of the green or red pixels is reduced (fig. 3).
In contrast, in the case of example 1 in which cyan and magenta color materials were introduced into the green pixel and the red pixel, it was confirmed that color purity and definition were excellent even without the partition wall, and that color purity and definition were improved without the partition wall in examples 2 to 7 in which a color material was introduced into only one of the green pixel and the red pixel.

Claims (11)

1. A color conversion pixel includes quantum dots and color materials.
2. The color conversion pixel according to claim 1,
the color material has a transmittance of 50% or more in at least two wavelength regions of 450nm, 540nm, and 640nm.
3. The color conversion pixel of claim 1,
the color material has a transmittance of 50% or more in two wavelength regions of 450nm, 540nm, and 640nm, and has a transmittance of 50% or less in one region.
4. The color conversion pixel of claim 1,
the color material has a transmittance of 50% or more in wavelength regions of 450nm and 540nm.
5. The color conversion pixel of claim 1,
the color material has a transmittance of 50% or more in a wavelength region of 450nm and 640nm.
6. The color conversion pixel of claim 1,
the color material is a cyan pigment.
7. The color conversion pixel according to claim 1, wherein the content of the first and second substances,
the color material is a magenta dye.
8. The color conversion pixel of claim 1,
the quantum dots are green quantum dots or red quantum dots.
9. A composition for a color converting pixel comprising: quantum dots; a color material having a transmittance of 50% or more in at least two wavelength regions of 450nm, 540nm, and 640 nm; a monomer; a binder; an initiator; and an additive.
10. A composition for a color conversion pixel, wherein, relative to the total weight of solid components in the composition for a color conversion pixel,
the content of the quantum dots is 5 to 40 wt%;
the content of the color material is 1 to 20 weight percent;
the monomer content is 20 to 60 wt%;
the content of the binder is 20 to 60 wt%;
the content of the initiator is 1 to 10 wt%; and is
The additive is present in an amount of 0.1 to 3 wt.%.
11. A display device comprising the color conversion pixel according to any one of claims 1 to 8.
CN202080097351.2A 2020-03-03 2020-11-03 Color conversion pixel, composition for color conversion pixel, and display device including the color conversion pixel Pending CN115152044A (en)

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