Display device

Abstract

Provided is a display device including first pixels of a first color, second pixels of a second color, and third pixels of a third color, the first pixels, second pixels, and third pixels being spaced apart from each other with non-pixel areas interposed therebetween. The display device comprises: a light-emitting layer having areas corresponding the first pixels, the second pixels, and the third pixels, respectively; a first color conversion pattern that is disposed on the light-emitting layer corresponding to one of the first pixels and converts incident light into light of a first color; and a second color conversion pattern that is disposed on the light-emitting layer corresponding to one of the second pixels and converts incident light into light of a second color, wherein the first color is green, the first color conversion pattern includes a first quantum dot and a fluorescent dye, and the fluorescent dye has a maximum absorption wavelength of 350 nm to 550 nm and a maximum fluorescence emission wavelength of 450 nm to 650 nm.

Description

display device

[0001] It's about the display device.

[0002]

[0003] A display device is a device that visually displays data. The display device may include a substrate divided into a display area and a peripheral area (non-display area). The display area may include a scan line and a data line formed by mutually insulating each other, and a plurality of pixels. The display area may include a thin film transistor and a pixel electrode electrically connected to the thin film transistor, corresponding to each of the pixels. In addition, the display area may include a counter electrode that is commonly provided for the pixels. The peripheral area may include various wires, a scan driver, a data driver, a control unit, a pad unit, etc., that transmit electrical signals to the display area.

[0004] Increasing the amount of quantum dots used or increasing the refractive index of quantum dots is being considered as a way to improve the light efficiency of display devices using quantum dots.

[0005]

[0006] A display device having improved light efficiency and a color conversion pattern that can be manufactured by inkjet jetting is provided.

[0007]

[0008] According to one embodiment, a display device is provided.

[0009] 1. The display device comprises: a light-emitting layer having first pixels of a first color, second pixels of a second color, and third pixels of a third color, which are spaced apart from each other with a non-pixel area therebetween, and which has areas corresponding to each of the first pixels, the second pixels, and the third pixels; a first color conversion pattern disposed on the light-emitting layer corresponding to any one of the first pixels and which converts incident light into light of the first color; and a second color conversion pattern disposed on the light-emitting layer corresponding to any one of the second pixels and which converts incident light into light of the second color, wherein the first color is green, the first color conversion pattern includes a first quantum dot and a first fluorescent dye, and the first fluorescent dye has a maximum absorption wavelength of 350 to 550 nm and a maximum fluorescence emission wavelength of 450 to 650 nm.

[0010] 2. In 1, the first fluorescent dye has a maximum absorption wavelength of 400 to 500 nm and a maximum fluorescence emission wavelength of 550 to 650 nm or 500 to 600 nm, a display device.

[0011] 3. A display device in 1-2, wherein the first fluorescent dye is a fluorescent dye that does not contain metal.

[0012] 4. In 1-3, the first fluorescent dye includes at least one dye selected from the group consisting of perylene, coronene, coumarin, xanthene, quinone-imine, acridine, anthracene, azo, naphthalene, oxazole, benzopyrrole, dipyrromethane, and BODIPY.

[0013] 5. In 1-4, the first fluorescent dye is a display device including a perylene dye of the following chemical formula 1:

[0014] [Chemical Formula 1]

[0015]

[0016] (In the above chemical formula 1,

[0017] R 11 Inland R 18, L 11 Inland L 14 , L 15 Inland L 18, a1 to a4, b1 to b4 are the same as defined in the description of the invention below).

[0018] 6. In 1-5, the first fluorescent dye comprises at least one of the following chemical formulae 1-1, 1-2, 1-3, 1-4, and 1-5:

[0019] [Chemical Formula 1-1]

[0020]

[0021] [Chemical Formula 1-2]

[0022]

[0023] [Chemical Formula 1-3]

[0024]

[0025] [Chemical Formula 1-4]

[0026]

[0027] [Chemical Formula 1-5]

[0028] .

[0029] 7. A display device according to 1-6, wherein the first fluorescent dye is included in the first color conversion pattern at 0.1 to 0.5 wt%.

[0030] 8. A display device in 1-7, wherein the first fluorescent dye is included in an amount of 0.001 to 10 parts by weight based on 100 parts by weight of the first quantum dot.

[0031] 9. A display device according to 1-8, wherein the first quantum dot comprises 20 to 60 wt% of the first color conversion pattern.

[0032] 10. A display device according to 1-9, wherein the first quantum dot has a maximum fluorescence emission wavelength of 500 nm to 680 nm.

[0033] 11. In 1-10, the first color conversion pattern is a display device including a cured product of a composition for a first color conversion pattern, which comprises, based on solid content, 20 to 60 wt% of a first quantum dot, 0.1 to 2 wt% of a first fluorescent dye, 0.1 to 5 wt% of a polymerization inhibitor, 0.1 to 5 wt% of a surfactant, 0.1 to 5 wt% of a photopolymerization initiator, 10 to 60 wt% of a first monomer, and 2 to 20 wt% of a first scattering agent.

[0034] 12. In 1-11, the second color conversion pattern includes a second quantum dot and a second fluorescent dye having a maximum absorption wavelength of 350 to 650 nm and a maximum fluorescence emission wavelength of 450 to 750 nm.

[0035] 13. In 1-12, the second fluorescent dye includes at least one dye selected from the group consisting of perylene, coumarin, xanthene, quinone-imine, acridine, azo, naphthalene, oxazole, benzopyrrole, dipyrromethane, and BODIPY.

[0036] 14. In 1-13, the second fluorescent dye includes a perylene dye of the following chemical formula 2, a display device:

[0037] [Chemical Formula 2]

[0038]

[0039] (In the above chemical formula 2,

[0040] R 19 Inland R 34, L 21 and L 22 is the same as defined in the description of the invention below).

[0041] 15. In 1-14, the second fluorescent dye is a display device including at least one of the following chemical formulae 2-1, 2-2, and 2-3:

[0042] [Chemical Formula 2-1]

[0043]

[0044] [Chemical Formula 2-2]

[0045]

[0046] [Chemical Formula 2-3]

[0047] .

[0048] 16. In 1-15, the display device comprises a first color filter arranged on the first color conversion pattern and a second color filter arranged on the second color conversion pattern.

[0049] 17. A display device according to 1-16, wherein the first color filter does not contain the first fluorescent dye.

[0050] 18. A display device according to 1-17, wherein the second color filter does not contain a fluorescent dye.

[0051]

[0052] A display device with significantly improved light efficiency is provided by quantum dots and specific fluorescent dyes contained in a color conversion pattern. Even when the fluorescent dye is included, there is no increase in viscosity, and thus the color conversion pattern can be manufactured by inkjet jetting, thereby providing a display device with improved processability.

[0053]

[0054] Figure 1 is a perspective view illustrating a display device according to an embodiment.

[0055] Fig. 2 is a cross-sectional view of a light-emitting substrate according to one embodiment.

[0056] Fig. 3 is a cross-sectional view of a color conversion substrate according to one embodiment.

[0057] Figure 4 is a plan view of a color conversion substrate.

[0058] Fig. 5 is a cross-sectional view illustrating the display device of Fig. 1.

[0059]

[0060] Hereinafter, embodiments of the present application will be described in more detail with reference to the attached drawings. However, the technology disclosed in the present application is not limited to the embodiments described herein and may be embodied in other forms. However, the embodiments introduced herein are provided so that the disclosed content can be thorough and complete and so that the spirit of the present application can be sufficiently conveyed to those skilled in the art. In order to clearly express the components of each device in the drawings, the sizes of the components, such as width and thickness, are somewhat enlarged. However, the sizes of the components, such as width and thickness, in the present invention do not limit the scope of the present invention. The same reference numerals in multiple drawings indicate substantially the same components.

[0061] The terminology used herein is for the purpose of describing exemplary embodiments only and is not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0062] In this specification, "upper" and "lower" are defined based on the drawing, and depending on the perspective, "upper" may be changed to "lower" and "lower" may be changed to "upper", and reference to "on" or "on" may include not only directly on but also cases where another structure is interposed in between. On the other hand, reference to "directly on" or "directly above" or "directly formed" indicates cases where there is no intervening other structure such as an intermediate body.

[0063] Unless otherwise specified herein, "substitution" means that at least one hydrogen atom is substituted with a halogen atom (F, Cl, Br, I), a hydroxy group, a C1 to C20 alkoxy group, a nitro group, a cyano group, an amine group, an imino group, an azido group, an amidino group, a hydrazino group, a hydrazono group, a carbonyl group, a carbamyl group, a thiol group, an ester group, an ether group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid or a salt thereof, a C1 to C20 alkyl group, a C1 to C20 haloalkyl group, a C2 to C20 alkenyl group, a C2 to C20 alkynyl group, a C6 to C20 aryl group, a C3 to C20 cycloalkyl group, a C3 to C20 cycloalkenyl group, a C3 to C20 cycloalkynyl group, a C2 to C20 heterocycloalkyl group, a C2 to C20 It means substituted with a heterocycloalkenyl group, a C2 to C20 heterocycloalkynyl group, a C3 to C20 heteroaryl group, a (meth)acryloyl group, a (meth)acryloyloxy group, or a combination thereof.

[0064] When describing a numerical range in this specification, “X to Y” means X or more and Y or less (X≤ and ≤Y).

[0065] According to one embodiment, the display device comprises: a light-emitting layer having first pixels of a first color, second pixels of a second color, and third pixels of a third color, the light-emitting layer being spaced apart from each other with a non-pixel area therebetween, the light-emitting layer having areas corresponding to each of the first pixels, the second pixels, and the third pixels; a first color conversion pattern disposed on the light-emitting layer corresponding to any one of the first pixels, the light-emitting pattern converting incident light into light of the first color; and a second color conversion pattern disposed on the light-emitting layer corresponding to any one of the second pixels, the light-emitting pattern converting incident light into light of the second color, the first color conversion pattern including a first quantum dot and a fluorescent dye, the fluorescent dye having a maximum absorption wavelength of 350 to 550 nm and a maximum fluorescence emission wavelength of 450 to 650 nm.

[0066] In one embodiment, the first color is green.

[0067] In one embodiment, the second color may be red.

[0068] In one embodiment, the third color may be blue.

[0069] According to one embodiment, the display device may further include fourth pixels of a fourth color.

[0070] Figure 1 is a perspective view illustrating a display device according to an embodiment.

[0071] Referring to FIG. 1, the display device may include a light-emitting substrate 1000 and a color conversion substrate 2000. The color conversion substrate 2000 may include a filler 2600 and an upper substrate 2100.

[0072] The light-emitting substrate has a light-emitting layer having regions corresponding to each of the first pixels, the second pixels, and the third pixels, and can emit light.

[0073] A color conversion substrate is disposed on the light-emitting substrate, and can convert the color of light emitted from the light-emitting substrate, thereby improving the color reproducibility of the display device.

[0074] Fig. 2 is a cross-sectional view of a light-emitting substrate according to one embodiment.

[0075] Referring to FIG. 2, the light-emitting substrate 1000 may include a lower substrate 1100, a pixel circuit layer 1200, a third pixel electrode 1000B, a first pixel electrode 1000G, a second pixel electrode 1000R, a pixel defining film 1300, a light-emitting layer 1400, a common electrode 1500, and an encapsulating layer 1600.

[0076] Among the light-emitting substrates, the pixel electrodes and the light-emitting layer may be formed to correspond to the first pixels, the second pixels, and the third pixels, respectively.

[0077] The lower substrate may include a transparent material or an opaque material.

[0078] The pixel circuit layer may be disposed on the lower substrate. The pixel circuit layer may include insulating layers, semiconductor patterns, and conductive patterns.

[0079] The third pixel electrode may be disposed on a pixel circuit layer. The third pixel electrode may be electrically connected to the pixel circuit layer. In one embodiment, the third pixel electrode may be formed of a metal, an alloy, a conductive metal oxide, a transparent conductive material, or the like.

[0080] The first pixel electrode may be disposed on the same layer as the third pixel electrode. In one embodiment, the first pixel electrode may be formed together with the third pixel electrode and may include the same material. The second pixel electrode may be disposed on the same layer as the third pixel electrode and the first pixel electrode. In one embodiment, the second pixel electrode may be formed together with the third pixel electrode and the first pixel electrode and may include the same material.

[0081] The pixel defining film may be disposed on the third pixel electrode, the first pixel electrode, and the second pixel electrode. An opening may be formed in the pixel defining film to expose the third pixel electrode, the first pixel electrode, and the second pixel electrode.

[0082] The light-emitting layer may be disposed on the third pixel electrode, the first pixel electrode, and the second pixel electrode. The light-emitting layer may include a first blue light-emitting layer, a second blue light-emitting layer, a third blue light-emitting layer, and a green light-emitting layer.

[0083] The common electrode may be disposed on the green light-emitting layer. In one embodiment, the common electrode may be formed of a metal, an alloy, a conductive metal oxide, a transparent conductive material, or the like.

[0084] The encapsulating layer may be disposed on the common electrode. The encapsulating layer may include at least one inorganic layer and at least one organic layer. The inorganic layer and the organic layer may be alternately laminated.

[0085] Fig. 3 is a cross-sectional view of a color conversion substrate according to one embodiment.

[0086] Referring to FIG. 3, the color conversion substrate 2000 may include an upper substrate 2100, a third color filter 2230, a first color filter 2210, a second color filter 2220, a refractive layer 2300, a protective layer 2400, a partition wall 2530, a first color conversion pattern 2510, a second color conversion pattern 2520, a capping layer 2540, a spacer 2550, and a filler 2600.

[0087] The upper substrate may include a transparent material or an opaque material.

[0088] The third color filter may be disposed on the upper substrate. In one embodiment, the third color filter may transmit only light having a wavelength corresponding to blue. In one embodiment, the third color filter may include a base member 2232 and scattering particles 2231. The base member may include an organic material in which a blue pigment (or blue dye) is dispersed. For example, the organic material included in the base member may include an acrylic resin, an epoxy resin, a polyimide resin, or the like. The scattering particles may scatter light. In one embodiment, the scattering particles may include titanium dioxide (TiO2) particles, zinc oxide (ZnO) particles, aluminum oxide (Al2O3) particles, silicon oxide (SiO2) particles, hollow silica particles, or the like. When the third color filter includes titanium dioxide particles, the content of the titanium dioxide particles included in the third color filter may be less than approximately 8.5 wt%. Additionally, the size of the titanium dioxide particles included in the third color filter may be approximately 100 nm or more and approximately 200 nm or less.

[0089] The first color filter may be positioned on the third color filter. The first color filter may expose the blue color filter in the blue aperture region 2000B. The first color filter may transmit only light having a wavelength corresponding to green. For example, the first color filter may include an organic material in which a green pigment (or, green dye) is dispersed.

[0090] According to one embodiment, the green pigment may not include the first fluorescent dye described below.

[0091] The second color filter may be disposed on the first color filter. The second color filter may expose the blue color filter in the blue aperture region, and may expose the first color filter in the green aperture region. The second color filter may transmit only light having a wavelength corresponding to red. For example, the second color filter may include an organic material in which a red pigment (or, red dye) is dispersed.

[0092] In one embodiment, the red pigment may not include the second fluorescent dye described below.

[0093] The refractive layer may be disposed on the second color filter. The refractive layer may entirely cover the third color filter, the first color filter, and the second color filter. In one embodiment, the refractive layer may include a material having a relatively low refractive index (or a material having a relatively high refractive index).

[0094] The protective layer may be disposed entirely on the refractive layer. In one embodiment, the protective layer may include an inorganic material. For example, the protective layer may include silicon oxide (SiO2), silicon nitride (SiN x ), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium dioxide (TiO2), tantalum dioxide (Ta2O5), hafnium dioxide (HfO2), or zinc dioxide (ZnO2).

[0095] The partition wall may be disposed on the protective layer. The partition wall may be formed to surround the blue aperture area 2000B, the green aperture area 2000G, and the red aperture area 2000R, respectively. In one embodiment, the partition wall may include a light-blocking material that blocks or absorbs light. For example, the partition wall may include a black pigment, a black dye, chromium (Cr), chromium oxide (CrOx), chromium nitride (CrNx), graphite, or the like.

[0096] The above-mentioned partition walls are formed to be spaced apart from each other by forming a non-pixel area, thereby distinguishing between first pixels of a first color, second pixels of a second color, and third pixels of a third color.

[0097] The first color conversion pattern may be disposed on the protective layer. In one embodiment, the first color conversion pattern may overlap the first color filter. Additionally, the first color conversion pattern may be accommodated by a partition wall in the green aperture region.

[0098] The first color conversion pattern includes a first quantum dot and a first fluorescent dye having a maximum absorption wavelength of 350 to 550 nm and a maximum fluorescence emission wavelength of 450 to 650 nm.

[0099] The first fluorescent dye can absorb blue light incident from the light-emitting layer and emit green light. Therefore, the first fluorescent dye can maintain high light efficiency even when the content of the first quantum dot in the first color conversion pattern is reduced. This allows the first fluorescent dye to absorb not only the energy absorbed by the first quantum dot in blue light but also the energy transmitting through the first color conversion pattern, thereby allowing the emission wavelength of the first quantum dot and the emission wavelength of the first fluorescent dye to overlap with each other, thereby significantly increasing light efficiency. In addition, this eliminates the need to increase the content of the first quantum dot in order to increase light efficiency, thereby enabling inkjet jetting of the composition forming the first color conversion pattern to be performed well.

[0100] There may be an absorbance overlap effect in the maximum absorption wavelength range of 350 to 550 nm.

[0101] There may be an effect of enhancing luminescence efficiency in the maximum fluorescence emission wavelength range of 450 to 650 nm.

[0102] Meanwhile, when quantum dots and fluorescent dyes are generally mixed, the interaction between the quantum dots and fluorescent dyes can cause energy transfer, which can eliminate the luminescence energy of both the fluorescent dye and the quantum dots, which can lower the light efficiency. On the other hand, the first fluorescent dye can increase the light efficiency without this problem. However, when the first fluorescent dye is included in the first color filter described above, the incident external light may be more radiated toward green by the first fluorescent dye, which can worsen the external reflection color.

[0103] In this specification, the ‘maximum absorption wavelength’ may be a value measured under coating single-film conditions.

[0104] In this specification, the ‘maximum fluorescence emission wavelength’ may be a value measured under a single-film coating condition.

[0105] According to one embodiment, the first fluorescent dye may have a maximum absorption wavelength of 400 to 500 nm and a maximum fluorescence emission wavelength of 500 to 600 nm or 550 to 650 nm.

[0106] The above first fluorescent dye may include at least one dye selected from the group consisting of perylene, coronene, coumarin, xanthene, quinone-imine, acridine, anthracene, azo, naphthalene, oxazole, benzopyrrole, dipyrromethane, and BODIPY.

[0107] Preferably, the first fluorescent dye may be a perylene-based dye. Among the dyes having the maximum absorption wavelength and maximum fluorescence emission wavelength range, a perylene-based dye, when included together with the first quantum dot, can increase the light efficiency of the first color conversion pattern and facilitate inkjet jetting.

[0108] In one specific example, the first fluorescent dye may include a perylene dye of the following chemical formula 1:

[0109] [Chemical Formula 1]

[0110]

[0111] (In the above chemical formula 1,

[0112] R 11 Inland R 18 are each independently hydrogen, deuterium, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a cyano group, a halogen, a substituted or unsubstituted alkoxy group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms,

[0113] L 11 Inland L 14 are each independently a single bond, -(C=O)O-, -O-, an ester group, an ether group, a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, a substituted or unsubstituted alkoxylene group having 1 to 10 carbon atoms, or a substituted or unsubstituted arylene group having 6 to 10 carbon atoms.

[0114] L15 Inland L 18 are each independently a substituted or unsubstituted straight-chain or branched-chain alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group or cyano group having 6 to 10 carbon atoms, or

[0115] L 15 Wow L 16 are linked to each other to form a ring having an aryl group of 6 to 20 carbon atoms, or

[0116] L 17 and L 18 are linked to each other to form a ring having an aryl group of 6 to 20 carbon atoms,

[0117] a1 to a4 are each independently integers from 0 to 5.

[0118] b1 to b4 are each independently integers from 0 to 5,

[0119] The sum of b1 to b4 exceeds 3).

[0120] Preferably, the first fluorescent dye may include at least one of the following chemical formulae 1-1, 1-2, 1-3, 1-4, and 1-5:

[0121] [Chemical Formula 1-1]

[0122]

[0123] [Chemical Formula 1-2]

[0124]

[0125] [Chemical Formula 1-3]

[0126]

[0127] [Chemical Formula 1-4]

[0128]

[0129] [Chemical Formula 1-5]

[0130]

[0131] The first fluorescent dye may be included in the first color conversion pattern at 0.1 to 2 wt%, for example, 0.25 to 1 wt%, or 0.25 to 0.5 wt%. In the above range, an increase in the viscosity of the composition for the first color conversion pattern can be prevented and light efficiency can be increased.

[0132] The first fluorescent dye may be included in an amount of 0.001 to 10 parts by weight, for example, 0.25 to 5 parts by weight, or 0.5 to 1 part by weight, based on 100 parts by weight of the first quantum dot. Within the above range, an increase in the viscosity of the composition for the first color conversion pattern can be prevented and light efficiency can be increased.

[0133] The first quantum dot may be included in the first color conversion pattern at 20 to 60 wt%, for example, 35 to 44 wt%. Within this range, an increase in the viscosity of the composition for the first color conversion pattern can be prevented and light efficiency can be increased.

[0134] The first quantum dot can convert the color of incident light to green. For example, the first quantum dot can be a quantum dot and can be selected from the group consisting of a group II-VI compound, a group IV-VI compound, a group IV element, a group IV compound, and combinations thereof.

[0135] The above first quantum dot may have a maximum fluorescence emission wavelength of 500 nm to 680 nm.

[0136] The first quantum dot may absorb light in a wavelength range of 360 nm to 780 nm, for example, a wavelength range of 400 nm to 780 nm, and emit fluorescence in a wavelength range of 500 nm to 700 nm, for example, 500 nm to 580 nm, or emit fluorescence in a wavelength range of 600 nm to 680 nm. That is, the quantum dot may have a maximum fluorescence emission wavelength (fluorescence λ) in a wavelength range of 500 nm to 680 nm. em ) can have.

[0137] The first quantum dots may each independently have a full width at half maximum (FWHM) of 20 nm to 100 nm, for example, 20 nm to 50 nm. When the quantum dots have a full width at half maximum (FWHM) in the above range, the color purity is high, and thus, when used as a color material in a color filter, the color reproducibility is enhanced.

[0138] The above first quantum dots may each independently be organic, inorganic, or a hybrid (hybrid) of organic and inorganic materials.

[0139] The above first quantum dots may each independently be composed of a core and a shell surrounding the core, and the core and shell may each independently have a structure such as a core, core / shell, core / first shell / second shell, alloy, alloy / shell, etc., made of group II-IV, group III-V, etc., but are not limited thereto.

[0140] For example, the core may include at least one material selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, GaN, GaP, GaAs, InP, InAs, and alloys thereof, but is not necessarily limited thereto. The shell surrounding the core may include at least one material selected from the group consisting of CdSe, ZnSe, ZnS, ZnTe, CdTe, PbS, TiO, SrSe, HgSe, and alloys thereof, but is not necessarily limited thereto.

[0141] In one implementation example, since environmental concerns have been increasing significantly worldwide and regulations on toxic substances have been strengthened, environmentally friendly non-cadmium-based luminescent materials (such as InP / ZnS, InP / ZeSe / ZnS) with somewhat lower quantum yields were used instead of luminescent materials having cadmium-based cores, but the present invention is not limited thereto.

[0142] In the case of the first quantum dot of the above core / shell structure, the size (average particle diameter) of each entire quantum dot including the shell may be 1 nm to 15 nm, for example, 5 nm to 15 nm.

[0143] For example, the first quantum dots may each independently include a red quantum dot, a green quantum dot, or a combination thereof. The red quantum dots may each independently have an average particle diameter of 10 nm to 15 nm. The green quantum dots may each independently have an average particle diameter of 5 nm to 8 nm.

[0144] The above first color conversion pattern may further include at least one of the first monomer and the first scattering agent.

[0145] The above first monomer may include an epoxy monomer, an ester monomer, a (meth)acrylate monomer, etc.

[0146] The first scattering agent can scatter light. In one embodiment, the first scattering agent can include titanium dioxide (TiO2) particles, zinc oxide (ZnO) particles, aluminum oxide (Al2O3) particles, silicon oxide (SiO2) particles, hollow silica particles, or the like.

[0147] The above first color conversion pattern may further include a photopolymerization initiator and other additives.

[0148] The above photopolymerization initiator is an initiator capable of initiating a polymerization reaction by light, and examples thereof include, but are not limited to, acetophenone-based compounds, benzophenone-based compounds, thioxanthone-based compounds, benzoin-based compounds, triazine-based compounds, oxime-based compounds, and aminoketone-based compounds.

[0149] The above other additives may include at least one of a polymerization inhibitor, malonic acid; 3-amino-1,2-propanediol; a silane coupling agent; a leveling agent; a surfactant; an antioxidant, or a combination thereof. The polymerization inhibitor may include, but is not necessarily limited to, a hydroquinone-based compound, a catechol-based compound, or a combination thereof. The silane coupling agent may be a silane coupling agent having a reactive substituent such as a vinyl group, a carboxyl group, a methacryloxy group, an isocyanate group, or an epoxy group. The leveling agent may include a fluorinated surfactant to improve the coatability and prevent the formation of defects, i.e., to improve the leveling performance.

[0150] According to one embodiment, the first color conversion pattern may include a cured product of a composition for a first color conversion pattern, which comprises, based on solid content, 20 to 60 wt% of a first quantum dot, 10 to 60 wt% of a first monomer, 0.1 to 2 wt% of a first fluorescent dye, 0.1 to 5 wt% of a polymerization inhibitor, 0.1 to 5 wt% of a surfactant, 0.1 to 5 wt% of a photopolymerization initiator, and 2 to 20 wt% of a first scattering agent. In the above range, formation of the first color conversion pattern may be facilitated, and light efficiency may be easily improved.

[0151] According to one embodiment, the composition may be a solvent-free composition.

[0152] The above first color conversion pattern can be formed by inkjet jetting of a composition for the first color conversion pattern. The inkjet jetting method can be performed by a conventional method known to those skilled in the art.

[0153] The second color conversion pattern may be disposed on the protective layer. In one embodiment, the second color conversion pattern may overlap the second color filter. Additionally, the second color conversion pattern may be accommodated by a partition wall in the red aperture region.

[0154] The second color conversion pattern includes second quantum dots and a second fluorescent dye having a maximum absorption wavelength of 350 to 650 nm and a maximum fluorescence emission wavelength of 450 to 750 nm. The second fluorescent dye can absorb blue light incident from the light-emitting layer and emit red light. Therefore, the second fluorescent dye can maintain high light efficiency even when the content of the second quantum dots in the second color conversion pattern is reduced. This allows the fluorescent dye to absorb not only energy absorbed by the second quantum dots among blue light but also energy transmitting through the second color conversion pattern, thereby significantly increasing light efficiency by allowing the emission wavelengths of the second quantum dots and the second fluorescent dye to overlap with each other. In addition, this eliminates the need to increase the content of the second quantum dots to increase light efficiency, thereby enabling inkjet jetting to proceed smoothly.

[0155] According to one embodiment, the second fluorescent dye may have a maximum absorption wavelength of 350 to 550 nm and a maximum fluorescence emission wavelength of 550 to 700 nm, 450 to 750 nm, or 500 to 600 nm.

[0156] There may be an absorbance overlap effect in the maximum absorption wavelength range of 350 to 550 nm.

[0157] There may be an effect of enhancing luminescence efficiency in the above maximum fluorescence emission wavelength range of 450 to 650 nm.

[0158] The above second fluorescent dye may include at least one dye selected from the group consisting of perylene, coumarin, xanthene, quinone-imine, acridine, azo, naphthalene, oxazole, benzopyrrole, dipyrromethane, and BODIPY.

[0159] Preferably, the second fluorescent dye may be a perylene-based fluorescent dye. Among the dyes having the maximum absorption wavelength and maximum fluorescence emission wavelength range, the perylene-based dye, when included together with the second quantum dot, can increase the light efficiency of the second color conversion pattern and facilitate inkjet jetting.

[0160] In one specific example, the second fluorescent dye may include a perylene dye of the following chemical formula 2:

[0161] [Chemical Formula 2]

[0162]

[0163] (In the above chemical formula 2,

[0164] R 19 Inland R 34 are each independently hydrogen, deuterium, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms,

[0165] L 21 and L 22 are each independently a substituted or unsubstituted straight-chain or branched-chain alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms.

[0166] Preferably, the second fluorescent dye may include at least one of the following chemical formulae 2-1, 2-2, and 2-3:

[0167] [Chemical Formula 2-1]

[0168]

[0169] [Chemical Formula 2-2]

[0170]

[0171] [Chemical Formula 2-3]

[0172]

[0173] The second fluorescent dye may be included in the second color conversion pattern at 0.1 to 0.5 wt%, for example, 0.1 to 0.3 wt%. In the above range, an increase in the viscosity of the composition for the second color conversion pattern can be prevented and light efficiency can be increased.

[0174] The second fluorescent dye may be included in an amount of 0.001 to 10 parts by weight, for example, 0.25 to 5 parts by weight, or 0.5 to 1 part by weight, based on 100 parts by weight of the second quantum dot. Within the above range, an increase in the viscosity of the composition for the second color conversion pattern can be prevented and light efficiency can be increased.

[0175] The second quantum dot may be included in the second color conversion pattern at 20 to 60 wt%, for example, 35 to 44 wt%. Within this range, the viscosity of the composition for the second color conversion pattern may be prevented from increasing and light efficiency may be increased. The second quantum dot may convert the color of incident light to red. For example, the second quantum dot may be a quantum dot and may be selected from the group consisting of a group II-VI compound, a group IV-VI compound, a group IV element, a group IV compound, and combinations thereof.

[0176] The second quantum dot can convert the color of incident light to red. For example, the second quantum dot can be a quantum dot and can be selected from the group consisting of a group II-VI compound, a group IV-VI compound, a group IV element, a group IV compound, and combinations thereof.

[0177] The second quantum dot may have a maximum fluorescence emission wavelength of 500 nm to 680 nm.

[0178] The second quantum dot may absorb light in a wavelength range of 360 nm to 780 nm, for example, a wavelength range of 400 nm to 780 nm, and emit fluorescence in a wavelength range of 500 nm to 700 nm, for example, 500 nm to 580 nm, or emit fluorescence in a wavelength range of 600 nm to 680 nm. That is, the quantum dot may have a maximum fluorescence emission wavelength (fluorescence λ) in a wavelength range of 500 nm to 680 nm. em ) can have.

[0179] The second quantum dots may each independently have a full width at half maximum (FWHM) of 20 nm to 100 nm, for example, 20 nm to 50 nm. When the quantum dots have a full width at half maximum (FWHM) in the above range, the color purity is high, which has the effect of increasing the color reproducibility when used as a color material in a color filter.

[0180] The above second quantum dots may each independently be organic, inorganic, or a hybrid (hybrid) of organic and inorganic materials.

[0181] The above second quantum dots may each independently be composed of a core and a shell surrounding the core, and the core and shell may each independently have a structure such as a core, core / shell, core / first shell / second shell, alloy, alloy / shell, etc., made of group II-IV, group III-V, etc., but are not limited thereto.

[0182] For example, the core may include at least one material selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, GaN, GaP, GaAs, InP, InAs, and alloys thereof, but is not necessarily limited thereto. The shell surrounding the core may include at least one material selected from the group consisting of CdSe, ZnSe, ZnS, ZnTe, CdTe, PbS, TiO, SrSe, HgSe, and alloys thereof, but is not necessarily limited thereto.

[0183] In one implementation example, since environmental concerns have been increasing significantly worldwide and regulations on toxic substances have been strengthened, environmentally friendly non-cadmium-based luminescent materials (such as InP / ZnS, InP / ZeSe / ZnS) with somewhat lower quantum yields were used instead of luminescent materials having cadmium-based cores, but the present invention is not limited thereto.

[0184] In the case of the second quantum dot of the above core / shell structure, the size (average particle diameter) of each quantum dot including the shell may be 1 nm to 15 nm, for example, 5 nm to 15 nm.

[0185] For example, the second quantum dots may each independently include a red quantum dot, a green quantum dot, or a combination thereof. The red quantum dots may each independently have an average particle diameter of 10 nm to 15 nm. The green quantum dots may each independently have an average particle diameter of 5 nm to 8 nm.

[0186] The second color conversion pattern may further include at least one of the first monomer and the second scattering agent.

[0187] The above second monomer may include an epoxy monomer, an ester monomer, a (meth)acrylate monomer, etc.

[0188] The second scattering agent can scatter light. In one embodiment, the second scattering agent can include one or more of the types described for the first scattering agent.

[0189] The second color conversion pattern may further include a photopolymerization initiator and other additives. The photopolymerization initiator and other additives may be substantially the same as those described in the first color conversion pattern.

[0190] According to one embodiment, the second color conversion pattern may include a cured product of a composition for a second color conversion pattern, which comprises, based on solid content, 20 to 60 wt% of a second quantum dot, 10 to 60 wt% of a second monomer, 0.1 to 2 wt% of a second fluorescent dye, 0.1 to 5 wt% of a polymerization inhibitor, 0.1 to 5 wt% of a surfactant, 0.1 to 5 wt% of a photopolymerization initiator, and 2 to 20 wt% of a second scattering agent. In the above range, the formation of the second color conversion pattern may be facilitated, and light efficiency may be easily improved.

[0191] According to one embodiment, the composition may be a solvent-free composition.

[0192] The above second color conversion pattern can be formed by inkjet jetting of a composition for the second color conversion pattern. The inkjet jetting method can be performed by a conventional method known to those skilled in the art.

[0193] The capping layer may be disposed on the partition wall, the first color conversion pattern, and the second color conversion pattern. The capping layer may entirely cover the partition wall, the first color conversion pattern, and the second color conversion pattern.

[0194] In one embodiment, the third opening region may not overlap with the color conversion pattern. In other words, the color conversion pattern may not be formed in the third opening region. Accordingly, the capping layer may contact the protective layer in the third opening region.

[0195] The spacer may be disposed on the capping layer and may overlap the barrier rib. In one embodiment, the spacer may be formed only on the barrier rib and may not overlap the blue opening region, the green opening region, or the red opening region.

[0196] The above-described filler may be disposed on the capping layer. The filler may cover the first color conversion pattern and the second color conversion pattern. In one embodiment, the filler may be accommodated by the partition wall in the blue opening region. For example, since the color conversion pattern is not formed in the blue opening region, the filler may be accommodated by the partition wall in the blue opening region.

[0197] In one embodiment, the filler may comprise an organic material having a relatively high refractive index. For example, the refractive index of the filler may be approximately 1.6 to approximately 1.8. For example, the filler may comprise a urethane resin, an epoxy resin, an acrylic resin, or the like.

[0198] Figure 4 is a plan view of a color conversion substrate.

[0199] Referring to FIG. 4, a partition wall may be formed on the color conversion substrate, and a blue aperture area, a red aperture area, and a green aperture area may be defined by the partition wall.

[0200] In one embodiment, the blue aperture region, the red aperture region, and the green aperture region may be arranged in a triangular shape. In addition, the area of ​​the blue aperture region may be smaller than the area of ​​the red aperture region, and the area of ​​the red aperture region may be smaller than the area of ​​the green aperture region. However, the present invention is not limited thereto.

[0201] In one embodiment, the blue opening region may accommodate the filler. For example, the partition wall may be formed to surround the blue opening region, and the filler may be accommodated by the partition wall in the blue opening region.

[0202] In one embodiment, the green aperture area may accommodate a first color conversion pattern. For example, the partition wall may be formed to further surround the green aperture area, and the first color conversion pattern may be accommodated by the partition wall in the green aperture area.

[0203] In one embodiment, the red aperture area may accommodate a second color conversion pattern. For example, the partition wall may be formed to further surround the red aperture area, and the second color conversion pattern may be accommodated by the partition wall in the red aperture area.

[0204] In one embodiment, the color conversion substrate may further be formed with at least one first dummy opening and at least one second dummy opening. The first dummy opening may be adjacent to the blue opening region, the red opening region, the green opening region, or the second dummy opening. The second dummy opening may have an area substantially similar to an area of ​​the green opening region and may be adjacent to the green opening region.

[0205] Fig. 5 is a cross-sectional view illustrating the display device of Fig. 1.

[0206] Referring to Fig. 5, it is a cross-sectional view for explaining the display device of Fig. 1.

[0207] Referring to Fig. 5, light emitted from the light-emitting layer overlapping the blue aperture area can be emitted through the third color filter. Light emitted from the light-emitting layer overlapping the green aperture area can be emitted through the first color conversion pattern and the first color filter. Light emitted from the light-emitting layer overlapping the red aperture area can be emitted through the second color conversion pattern and the second color filter.

[0208] As a color conversion pattern is not formed in the blue aperture region, the brightness of light passing through the third color filter can be increased. In addition, as the third color filter includes the scattering particles, the lateral brightness of light passing through the third color filter can be increased.

[0209]

[0210] Hereinafter, the structure and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, these are presented as preferred examples of the present invention and should not be construed as limiting the present invention in any way.

[0211]

[0212] (Preparation of a composition for the first color conversion pattern)

[0213] (A) Quantum dot: Green quantum dot dispersion solution (InP / ZnSe / ZnS, Hansol Chemical; quantum dot solid content 23 wt%)

[0214] (B) Monomer; 1,6-hexanediol diacrylate (Miwon Specialty Chemical Co.)

[0215] (C) Polymerization inhibitor: Methylhydroquinone (TOKYO CHEMICAL)

[0216] (D) Surfactant: F563

[0217] (E) Photopolymerization initiator: TPO-L (Polynetran)

[0218] (F) Light scattering agent: Titanium dioxide dispersion (rutile type TiO2; D50 (180 nm), solid content 50 wt%, Iridos Co., Ltd.)

[0219] (F) First fluorescent dye: Dye of the above chemical formula 1-1 (maximum absorption wavelength: 477 nm, maximum fluorescence emission wavelength: 518 nm)

[0220] (G) Fluorescent dye: NSQ-18 (maximum absorption wavelength: 625 nm, maximum fluorescence emission wavelength: 660 nm)

[0221]

[0222] Example 1

[0223] The above green quantum dots and monomer are mixed and stirred at room temperature for 12 hours. A polymerization inhibitor is added and stirred at room temperature for 5 minutes. Next, a photopolymerization initiator is added, followed by a light scattering agent and a first fluorescent dye, and mixed to prepare a composition for a first color conversion pattern (solvent-free). Table 1 below shows the solid content of each component (total: 100 parts by weight).

[0224]

[0225] Examples 2 and 3

[0226] A composition for a first color conversion pattern is prepared in the same manner as in Example 1, except that the content of each component of the first color conversion composition in Example 1 is changed as shown in Table 1 below.

[0227]

[0228] Comparative Examples 1 and 2

[0229] A composition for a first color conversion pattern is prepared in the same manner as in Example 1, except that the content of each component of the first color conversion composition in Example 1 is changed as shown in Table 1 below.

[0230]

[0231] In the examples and comparative examples, the content of each component based on the solid content of the composition is as shown in Table 1 below.

[0232] Comparative Example 12312 Quantum Dot 4141414141 Monomer 47.65 47.446.947.947.65 Polymerization Inhibitor 11111 Surfactant 0.10.10.10.10.1 Photopolymerization Initiator 22222 Light Scattering Agent 88888 First Fluorescent Dye 0.25 0.5 100 Fluorescent Dye 00000.25 Total 100100100100100

[0233] The properties of the manufactured composition were evaluated in Table 1 below, and the results are shown in Table 2 below.

[0234] (1) Viscosity (unit: cps): For each composition for color conversion pattern, the viscosity value was measured at 25°C using a viscometer (Brookfield DV-Ⅱ, RV-2 spindle, 23 rpm).

[0235] (2) EQE (external quantum efficiency, unit: %): 2 mL of each color conversion pattern composition corresponding to the examples and comparative examples was applied onto a glass substrate, spin-coated at 1500 rpm, and exposed using an exposure device (wavelength 395 nm). Thereafter, EQE was measured for a single film (2 cm x 2 cm) on the glass substrate using an integrating hemisphere quantum efficiency meter (Otsuka, QE-2000).

[0236] Afterwards, curing (POB) was performed in a nitrogen atmosphere at 180°C for 30 minutes, and then cooling was performed for 1 hour. EQE was measured using the same method as above.

[0237] The retention rate was calculated as the percentage of the EQE measured in the POB relative to the EQE measured after exposure. A higher retention rate indicates that the light efficiency of the color conversion pattern formed by the curable composition did not decrease.

[0238] Example Comparative Example 12312 Viscosity 24.8 24.7 24.9 24.4 30.4 Post-exposure abs 8 1.78 5.78 9.87 5.87 6.9 EQE (%) 31.6 30.0 30.5 31.2 31.4 λ (nm) 5 30.65 31.0 5 31.5 5 30.65 31.4 FWHM (nm) 35.7 37.0 38.4 34.3 35.4 PO Babs 8 2.78 7.1 9 0.97 5.97 6.5EQE(%)34.735.736.731.732.1λ(nm)531.4532.1532.7530.9531.5FWHM(nm)36.838.739.634.635.6Retention(%)109119119101.8101Thickness(㎛)9.09.09.09.09.0Light Transmittance(%, @530nm)59.859.760.460.865.8

[0239] According to Table 2 above, in the case of the embodiment, compared to Comparative Example 1 in which the first fluorescent dye was not added, it can be seen that while the viscosity change did not increase due to the addition of the dye, a significant increase in the retention rate after POB was observed. This has the advantage of overcoming the decline in fairness due to the increase in viscosity that occurs when the content of quantum dots is increased to increase the EQE of the single film. In the case of the embodiment, it can be seen that a significant increase in the retention rate after POB was observed compared to Comparative Example 2 in which a fluorescent dye outside the maximum absorption wavelength and maximum fluorescence emission wavelength of the first fluorescent dye was added instead of the first fluorescent dye.

[0240]

[0241] Simple modifications or changes of the present invention can be easily implemented by a person having ordinary skill in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims

1. In a display device including first pixels of a first color, second pixels of a second color, and third pixels of a third color, which are spaced apart from each other with a non-pixel area in between, A light-emitting layer having regions corresponding to each of the first pixels, the second pixels, and the third pixels; A first color conversion pattern is disposed on a light-emitting layer corresponding to any one of the first pixels and converts incident light into light of a first color; and a second color conversion pattern is disposed on a light-emitting layer corresponding to any one of the second pixels and converts incident light into light of a second color. The first color is green, and the first color conversion pattern includes a first quantum dot and a first fluorescent dye, A display device wherein the first fluorescent dye has a maximum absorption wavelength of 350 to 550 nm and a maximum fluorescence emission wavelength of 450 to 650 nm.

2. A display device according to claim 1, wherein the first fluorescent dye has a maximum absorption wavelength of 400 to 500 nm and a maximum fluorescence emission wavelength of 550 to 650 nm or 500 to 600 nm.

3. A display device according to claim 1, wherein the first fluorescent dye is a fluorescent dye that does not contain metal.

4. In the first paragraph, the first fluorescent dye is a display device including at least one dye selected from the group consisting of perylene, coronene, coumarin, xanthene, quinone-imine, acridine, anthracene, azo, naphthalene, oxazole, benzopyrrole, dipyrromethane, and BODIPY.

5. In the first paragraph, the first fluorescent dye is a display device including a perylene dye of the following chemical formula 1: [Chemical Formula 1] (In the above chemical formula 1, R 11 Inland R 18 are each independently hydrogen, deuterium, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a cyano group, a halogen, a substituted or unsubstituted alkoxy group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms, L 11 Inland L 14 are each independently a single bond, -(C=O)O-, -O-, an ester group, an ether group, a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, a substituted or unsubstituted alkoxylene group having 1 to 10 carbon atoms, or a substituted or unsubstituted arylene group having 6 to 10 carbon atoms. L 15 Inland L 18 are each independently a substituted or unsubstituted straight-chain or branched-chain alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group or cyano group having 6 to 10 carbon atoms, or L 15 Wow L 16 are linked to each other to form a ring having an aryl group of 6 to 20 carbon atoms, or L 17 and L 18 are linked to each other to form a ring having an aryl group of 6 to 20 carbon atoms, a1 to a4 are each independently integers from 0 to 5. b1 to b4 are each independently an integer from 0 to 5, The sum of b1 to b4 exceeds 3).

6. In the first paragraph, the first fluorescent dye comprises at least one of the following chemical formulae 1-1, 1-2, 1-3, 1-4, and 1-5: [Chemical Formula 1-1] [Chemical Formula 1-2] [Chemical Formula 1-3] [Chemical Formula 1-4] [Chemical Formula 1-5] .

7. A display device according to claim 1, wherein the first fluorescent dye is included in the first color conversion pattern at 0.1 to 0.5 wt%.

8. A display device according to claim 1, wherein the first fluorescent dye is included in an amount of 0.001 to 10 parts by weight based on 100 parts by weight of the first quantum dot.

9. A display device according to claim 1, wherein the first quantum dot comprises 20 to 60 wt% of the first color conversion pattern.

10. A display device according to claim 1, wherein the first quantum dot has a maximum fluorescence emission wavelength of 500 nm to 680 nm.

11. A display device according to claim 1, wherein the first color conversion pattern comprises a cured product of a composition for a first color conversion pattern, the composition comprising, based on solid content, 20 to 60 wt% of a first quantum dot, 0.1 to 2 wt% of a first fluorescent dye, 0.1 to 5 wt% of a polymerization inhibitor, 0.1 to 5 wt% of a surfactant, 0.1 to 5 wt% of a photopolymerization initiator, 10 to 60 wt% of a first monomer, and 2 to 20 wt% of a first scattering agent.

12. A display device according to claim 1, wherein the second color conversion pattern includes a second quantum dot and a second fluorescent dye having a maximum absorption wavelength of 350 to 650 nm and a maximum fluorescence emission wavelength of 450 to 750 nm.

13. In the 11th paragraph, the second fluorescent dye is a display device comprising at least one dye selected from the group consisting of perylene, coumarin, xanthene, quinone-imine, acridine, azo, naphthalene, oxazole, benzopyrrole, dipyrromethane, and BODIPY.

14. In the 11th paragraph, the second fluorescent dye comprises a perylene dye of the following chemical formula 2, a display device: [Chemical Formula 2] (In the above chemical formula 2, R 19 Inland R 34 are each independently hydrogen, deuterium, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms, L 21 and L 22 are each independently a substituted or unsubstituted straight-chain or branched-chain alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms.

15. In the 14th paragraph, the second fluorescent dye is a display device including at least one of the following chemical formulas 2-1, 2-2, and 2-3: [Chemical Formula 2-1] [Chemical Formula 2-2] [Chemical Formula 2-3] .

16. A display device according to claim 1, wherein the display device comprises a first color filter disposed on the first color conversion pattern and a second color filter disposed on the second color conversion pattern.

17. A display device according to claim 16, wherein the first color filter does not contain the first fluorescent dye.

18. A display device according to claim 16, wherein the second color filter does not contain a fluorescent dye.

Images