Indication device

Abstract

To provide a display device having a low reflection rate without a deflection film.SOLUTION: A present invention provides a display device. The display device according to an embodiment of the present invention includes: a display panel in which a 1-1 reflection rate in a wavelength of 650nm to 680nm is larger than a 1-2 reflection ratio in a wavelength of 420nm to 440nm; a first layer that is arranged onto the display panel, includes a first transmission factor in a first wavelength range, includes a second transmission factor in a second wavelength range that is different from the first wavelength range, and includes a third transmission factor in a third wavelength range that is different from the first and second wavelength ranges; a barrier film that is arranged onto the first layer; and a second layer that is arranged onto the barrier layer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a display device, and more particularly to a display device that can achieve low reflectance and reddish neutral black without including a polarizing film through an optimal structural design. [Background technology]

[0002] The display device may be an organic light emitting display device. Unlike liquid crystal display devices (LCDs) that have a backlight, organic light emitting display devices (OLEDs) do not require a separate light source. Therefore, they can be manufactured to be lightweight and thin, which is advantageous in terms of processability, and they have the advantage of low power consumption due to low voltage operation. Most importantly, organic light emitting display devices include self-emitting elements, and each layer can be formed as a thin organic thin film, which has excellent flexibility and elasticity compared to other display devices, making them more suitable for being constructed into a display panel.

[0003] Generally, display panels of display devices are equipped with polarizing films to minimize or reduce reflections from external light. However, in recent years, the cost of polarizing films has become excessive due to rising prices, and there is an increasing need for display devices that have low reflectance without polarizing films, can increase light efficiency, and can achieve reddish neutral black. Neutral black can refer to the hue of a display device when it is turned off. Summary of the Invention [Problem to be solved by the invention]

[0004] The problem to be solved by the present invention is to provide a display device having low reflectance even without a polarizing film.

[0005] Another problem to be solved by the present invention is to provide a display device that can achieve neutral black at low cost.

[0006] The objects of the present invention are not limited to those mentioned above, and other objects not mentioned above will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0007] A display device according to one embodiment of the present invention includes a display panel having a 1-1 reflectance at wavelengths of 650 nm to 680 nm that is greater than a 1-2 reflectance at wavelengths of 420 nm to 440 nm, a first layer disposed on the display panel, the first layer having a first transmittance in a first wavelength range, a second transmittance in a second wavelength range different from the first wavelength range, and a third transmittance in a third wavelength range different from the first wavelength range and the second wavelength range, a barrier film disposed on the first layer, and a second layer disposed on the barrier film.

[0008] Further details of the embodiments are included in the detailed description and drawings. [Effects of the Invention]

[0009] The present invention can provide a display device that has low reflectance even without a polarizing film.

[0010] The present invention can provide a display device that can achieve neutral black at low cost.

[0011] The effects of the present invention are not limited to the above-mentioned examples, and various other effects are included within the scope of the present invention. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a plan view of a display device according to an embodiment of the present specification; [Figure 2] 2 is a perspective view showing the display device of FIG. 1 in a folded state. FIG. [Figure 3] 3 is a cross-sectional view schematically showing an example of a cross section of a pixel included in the display device of FIGS. 1 and 2. FIG. [Figure 4] 2 is a schematic cross-sectional view showing an example of a display device including a reflective visual sensation adjustment film disposed on the display panel of FIG. 1. FIG. [Figure 5] 1. FIG. 4 is a schematic cross-sectional view showing another example of a display device including a reflective visibility control film disposed on the display panel of FIG. [Figure 6] 10 is a graph showing measured transmittance for each wavelength according to Case 1 to Case 3 of a first layer constituting a reflective visibility control film used in a display device according to an embodiment of the present invention. [Figure 7] 10 is a table showing optical characteristics of a reflective visibility control film including the first layer of Case 1 to Case 3 described above. [Figure 8] 10 is a table showing the optical characteristics of Case 3 depending on the reflectance of the second layer. [Figure 9] 10 is a table showing optical properties of Comparative Examples 5 to 7, which are further comparative examples, and a comparative example of an HTO structure. DETAILED DESCRIPTION OF THE INVENTION

[0013] The advantages and features of the present invention, and the methods for achieving them, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various different forms. These embodiments are provided solely so that this disclosure will be complete and will fully convey the scope of the invention to those skilled in the art. The present invention is defined only by the claims.

[0014] The shapes, areas, ratios, angles, numbers, etc. disclosed in the drawings for illustrating the embodiments of the present invention are illustrative only, and the present invention is not limited to the illustrated details. The same reference symbols refer to the same elements throughout the specification. Furthermore, when describing the present invention, if a detailed description of related prior art is deemed to unnecessarily obscure the gist of the present invention, such a detailed description will be omitted. When using words such as "include," "have," and "be made" in the present invention, other parts may be added unless "only" is used. When a component is expressed in the singular, it also includes the plural unless otherwise explicitly stated.

[0015] When interpreting elements, they are interpreted as including a margin of error even if there is no other explicit description.

[0016] When describing a positional relationship, for example, when describing the positional relationship of two parts using "above," "at the top," "below," "next to," etc., one or more other parts may be located between the two parts, as long as "immediately" or "directly" is not used.

[0017] When an element or layer is referred to as "on" another element or layer, it includes the case where the element or layer is directly on top of the other element or layer, or where there are other layers or elements interposed therebetween.

[0018] Furthermore, although terms such as "first," "second," etc. are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, a first component referred to below may be a second component within the technical concept of the present invention.

[0019] Like reference numbers refer to like elements throughout the specification.

[0020] The area and thickness of each component shown in the drawings are shown for convenience of explanation, and the present invention is not necessarily limited to the area and thickness of the components shown.

[0021] The features of the various embodiments of the present invention may be partially or wholly combined or combined with each other, and may be technically interlocked and driven in various ways, and each embodiment may be implemented independently of the other or may be implemented together in a related relationship.

[0022] In the following, the invention will be described with reference to the drawings.

[0023] Fig. 1 is a plan view of a display device according to an embodiment of the present specification, and Fig. 2 is a perspective view showing the display device of Fig. 1 in a folded state.

[0024] The display device 100 according to the embodiment of the present specification includes a display panel 110, an optical member 120, and a window member 130. For convenience of explanation, the following description will be made assuming that the display device 100 according to the embodiment of the present specification is an organic light emitting display device, but is not limited thereto.

[0025] Referring to FIG. 1 , a display device 100 according to an embodiment of the present specification includes a display area DA and a non-display area NDA. The display area DA is an area where a plurality of pixels are arranged and an image is actually displayed. The display area DA may include a plurality of pixels including light-emitting areas for displaying an image, thin film transistors for driving the pixels, capacitors, etc. Each pixel may include a plurality of sub-pixels SP. The sub-pixels SP are the smallest units constituting the display area, and each sub-pixel SP may be configured to emit light of a specific wavelength band. For example, each sub-pixel SP may be configured to emit red, green, blue, or white light. The non-display area NDA is arranged to surround the display area DA. The non-display area NDA is an area where an image is not actually displayed, and various wirings and driving ICs for driving the pixels and driving elements arranged in the display area DA may be arranged. For example, various ICs such as gate driver ICs and data driver ICs, VSS wiring, etc. may be arranged in the non-display area NDA.

[0026] 1 and 2, a display device 100 according to an embodiment of the present specification includes a folding area FA and a non-folding area NFA. The folding area FA is an area that is folded when folding the display device 100, and may be folded with a specific radius of curvature based on a folding axis FX. For example, the folding axis FX of the folding area FA may be formed in the Y-axis direction, and the non-folding area NFA may extend from the folding area FA in the X-axis direction perpendicular to the folding axis FX.

[0027] When folding the display device 100, if the folding region FA is folded based on the folding axis FX, the folding region FA may form a part of a circle or an ellipse. The radius of curvature of the folding region FA may be the radius of the circle or ellipse formed by the folding region FA. When the top surface of the display device 100 on which an image is displayed is the display surface and the bottom surface of the display device 100 opposite the display surface is the rear surface, the folding region FA may be folded in a manner selected from an out-folding manner in which the display surface of the display device 100 is exposed to the outside, or an in-folding manner in which the display surfaces of the display devices 100 face each other.

[0028] The non-folding areas NFA are areas that are not folded when folding the display device 100. For example, the non-folding areas NFA maintain a flat state when folding the display device 100. The non-folding areas NFA may be located on both sides of the folding areas FA. For example, the non-folding areas NFA may be areas that extend in the X-axis direction based on the folding axis FX. The folding areas FA may be located between the non-folding areas NFA. Furthermore, when the display device 100 is folded based on the folding axis FX, the non-folding areas NFA may overlap each other.

[0029] 1 and 2, display device 100 is shown as having one folding area FA and two non-folding areas NFA, but the number and positions of the folding areas FA and non-folding areas NFA may be varied in various ways and are not limited thereto. For example, display device 100 may include two or more folding areas FA and / or three or more non-folding areas NFA.

[0030] FIG. 3 is a cross-sectional view that schematically shows an example of a cross section of a pixel included in the display device of FIGS.

[0031] 3, the substrate 310 serves to support and protect the components of the organic light emitting display device 100 disposed thereon, and in recent years, may be made of a flexible material, so the substrate 310 may be a flexible substrate. For example, the flexible substrate may be in the form of a film including one selected from the group consisting of polyester-based polymers, silicone-based polymers, acrylic-based polymers, polyolefin-based polymers, and copolymers thereof.

[0032] For example, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polysilane, polysiloxane, polysilazane, polycarbosilane, polyacrylate, polymethacrylate, polymethylacrylate, polymethylmethacrylate, polyethylacrylate, polyethylmethacrylate The material may be at least one of styrene-acrylnitrile copolymer (styrene copolymer), cyclic olefin copolymer (COC), cyclic olefin polymer (COP), polyethylene (PE), polypropylene (PP), polyimide (PI), polymethyl methacrylate (PMMA), polystyrene (PS), polyacetal (POM), polyether ether ketone (PEEK), polyester sulfone (PES), polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), polycarbonate (PC), polyvinylidene fluoride (PVDF), perfluoroalkyl polymer (PFA), styrene acrylonitrile copolymer (SAN), and combinations thereof.

[0033] A buffer layer 312 is disposed on the flexible substrate 310. The buffer layer 312, which may be composed of a single layer or multiple layers of silicon oxide (SiOx) or silicon nitride (SiNx), prevents the penetration of moisture and other impurities through the substrate 310 and can flatten the surface of the substrate 310. The buffer layer 312 is not necessarily a necessary component and may be omitted depending on the type of substrate 310 and the type of thin film transistor disposed on the substrate 310.

[0034] A thin film transistor 320 disposed on the buffer layer 312 includes a gate electrode 322 , a source electrode 324 , a drain electrode 326 and a semiconductor layer 328 .

[0035] The semiconductor layer 328 may be made of, but is not limited to, amorphous silicon or polycrystalline silicon, which has better mobility than amorphous silicon, low energy consumption, excellent reliability, and can be used for driving thin film transistors in pixels.

[0036] In recent years, oxide semiconductors have been attracting attention due to their excellent properties in terms of mobility and uniformity. Oxide semiconductors include indium tin gallium zinc oxide (InSnGaZnO)-based materials, which are quaternary metal oxides, indium gallium zinc oxide (InGaZnO)-based materials, indium tin zinc oxide (InSnZnO)-based materials, indium aluminum zinc oxide (InAlZnO)-based materials, tin gallium zinc oxide (SnGaZnO)-based materials, aluminum gallium zinc oxide (AlGaZnO)-based materials, tin aluminum zinc oxide (SnAlZnO)-based materials, and binary metal oxides. The material may be an indium zinc oxide (InZnO)-based material, a tin zinc oxide (SnZnO)-based material, an aluminum zinc oxide (AlZnO)-based material, a zinc magnesium oxide (ZnMgO)-based material, a tin magnesium oxide (SnMgO)-based material, an indium magnesium oxide (InMgO)-based material, an indium gallium oxide (InGaO)-based material, an indium oxide (InO)-based material, a tin oxide (SnO)-based material, a zinc oxide (ZnO)-based material, or the like, and the composition ratio of each element is not limited.

[0037] The semiconductor layer 328 may include a source region containing p-type or n-type impurities, a drain region, and a channel between the source region and the drain region, and may include a lightly doped region between the channel and the adjacent source region and drain region.

[0038] The semiconductor layer 328 may include a region doped with one of impurities selected from boron (B), aluminum (Al), gallium (Ga), and indium (In). The semiconductor layer 328 may include a region doped with a high concentration of one of impurities selected from phosphorus (P), arsenic (As), and antimony (Sb).

[0039] The first insulating layer 314 is an insulating layer made of a single layer of silicon oxide (SiOx) or silicon nitride (SiNx) or multiple layers thereof, and is disposed so that the current flowing through the semiconductor layer 328 does not flow through the gate electrode 322. Silicon oxide is less ductile than metal but is more ductile than silicon nitride, and can be selectively formed as a single layer or multiple layers depending on its properties.

[0040] When polycrystalline silicon is used for the semiconductor layer 328, an insulating layer disposed adjacent to the semiconductor layer 328 may be an inorganic film layer with a high hydrogen content. For example, if a layer adjacent to the polycrystalline silicon semiconductor layer 328 is made of silicon nitride (SiNx) and a layer not adjacent to the polycrystalline silicon semiconductor layer 328 is made of silicon oxide (SiOx), hydrogen is diffused into the polycrystalline silicon semiconductor layer 328 and stabilized, thereby preventing a deterioration in the characteristics of the thin film transistor 320.

[0041] When an oxide semiconductor is used for the semiconductor layer 328, an insulating layer disposed adjacent to the semiconductor layer 328 may be formed as an inorganic film layer with a low hydrogen content. For example, if the layer adjacent to the oxide semiconductor layer 328 is made of silicon oxide (SiOx) and the layer not adjacent to the oxide semiconductor layer 328 is made of silicon nitride (SiNx), hydrogen can be prevented from diffusing into the oxide semiconductor layer 328, thereby preventing a deterioration in the characteristics of the thin film transistor 320.

[0042] The gate electrode 322 acts as a switch that turns on or off the thin film transistor 320 based on an electrical signal transmitted from the outside through the gate line, and may be made of a conductive metal such as copper (Cu), aluminum (Al), molybdenum (Mo), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), etc., or an alloy thereof, and may be configured as a single layer or multiple layers, but is not limited thereto.

[0043] The source electrode 324 and the drain electrode 326 are connected to the data line so that an externally transmitted electrical signal is transmitted from the thin film transistor 320 to the light emitting element 330. The source electrode 324 and the drain electrode 326 may be formed as a single layer or multiple layers using a conductive metal such as copper (Cu), aluminum (Al), molybdenum (Mo), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), or an alloy thereof, but are not limited thereto.

[0044] To insulate the gate electrode 322 from the source electrode 324 and the drain electrode 326, a second insulating layer 316 made of silicon oxide (SiOx) or silicon nitride (SiNx) can be disposed between the gate electrode 322 and the source electrode 324 and the drain electrode 326.

[0045] A passivation layer made of an inorganic insulating layer such as silicon oxide (SiOx) or silicon nitride (SiNx) may be further disposed on the thin film transistor 320. The passivation layer may prevent unnecessary electrical connection between components above and below the passivation layer and prevent external contamination or damage, and may be omitted depending on the configuration and characteristics of the thin film transistor 320 and the light emitting element 330.

[0046] The thin film transistor 320 can be classified into an inverted staggered structure and a coplanar structure depending on the positions of the components constituting the thin film transistor 320. In a thin film transistor with an inverted staggered structure, the gate electrode is located on the opposite side of the semiconductor layer from the source electrode and the drain electrode. In a thin film transistor with a coplanar structure, the gate electrode 322 is located on the same side of the semiconductor layer 328 as the source electrode 324 and the drain electrode 326.

[0047] Although FIG. 3 shows a thin film transistor 320 with a coplanar structure, the organic light-emitting display device 100 may include a thin film transistor with an inverted staggered structure.

[0048] For ease of explanation, only a driving thin film transistor is shown among various thin film transistors that may be included in the organic light emitting display device 100, but a switching thin film transistor, a capacitor, etc. may also be included in the organic light emitting display device 100. When a signal is applied from a gate line to the switching thin film transistor, the switching thin film transistor transmits a signal from a data line to the gate electrode of the driving thin film transistor. The driving thin film transistor transmits a current transmitted through a power line to its anode in response to the signal transmitted from the switching thin film transistor, and controls light emission according to the current transmitted to the anode.

[0049] A planarization layer 318 is disposed on the thin film transistor 320 to protect the thin film transistor 320, reduce the step caused by the thin film transistor 320, and reduce the parasitic capacitance generated between the thin film transistor 320 and the gate line, data line, and light emitting element 330.

[0050] The planarization layer 318 may be formed in multiple layers depending on the structure and characteristics of the OLED display 100, and may be made of one or more materials including, but not limited to, acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylenesulfide resin, and benzocyclobutene.

[0051] A light-emitting element 330 disposed on the planarization layer 318 includes an anode 332 , a light-emitting portion 334 , and a cathode 336 .

[0052] The anode 332 disposed on the planarization layer 318 may be made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), but is not limited thereto. Because the anode 332 is disposed on the planarization layer 318, it may be described as being disposed on the substrate 310 for convenience of explanation.

[0053] If the organic light emitting display device 100 is a top emission type that emits light from above where the cathode 336 is disposed, it may further include a reflective layer so that the emitted light can be reflected by the anode 332 and more smoothly emitted toward above where the cathode 336 is disposed.

[0054] For example, the anode 332 may have a two-layer structure in which a transparent conductive layer and a reflective layer made of a transparent conductive material are laminated in this order, or a three-layer structure in which a transparent conductive layer, a reflective layer, and another transparent conductive layer are laminated in this order, and the reflective layer may be made of silver (Ag) or an alloy containing silver.

[0055] The bank layer 340 disposed on the anode 332 and the planarization layer 318 defines pixels that can define areas that actually emit light. That is, the bank layer 340 is disposed on the planarization layer 318 and can expose at least a central portion of the upper surface of the anode. The bank layer 340 may include at least one opening for exposing at least a central portion of the upper surface of the anode. Furthermore, because the bank layer 340 is disposed on the planarization layer 318, it may be described as being disposed on the substrate 310 for convenience of explanation.

[0056] The bank layer 340 is formed by photolithography after forming a photoresist. Photoresist is a photosensitive resin whose solubility in a developer changes due to the action of light. A specific pattern can be obtained by exposing and developing the photoresist.

[0057] Photoresists can be classified into positive photoresists and negative photoresists. Positive photoresists are photoresists whose exposed areas become more soluble in a developer when exposed to light, and when developed, a pattern is obtained in which the exposed areas are removed. Negative photoresists are photoresists whose exposed areas become less soluble in a developer when exposed to light, and when developed, a pattern is obtained in which the unexposed areas are removed.

[0058] A fine metal mask (FMM), which is a deposition mask, may be used to form the light-emitting portion 334 of the organic light-emitting display device 100. A spacer (not shown) is disposed on the bank layer 340 to prevent damage that may occur due to contact with the deposition mask disposed on the bank layer 340 and to maintain a certain distance between the bank layer 340 and the deposition mask.

[0059] The spacers (not shown) may be formed in a single process using the same material as the bank layer 340. In the folding region where the flexible organic light emitting display device 100 is folded, spacers (not shown) are formed and arranged on the bank layer 340 in a region adjacent to the light emitting element 330 to prevent peeling that occurs during folding.

[0060] The light emitting unit 334 is disposed between the anode 332 and the cathode 336. The light emitting unit 334 emits light and may include at least one layer selected from the group consisting of a hole injection layer (HIL), a hole transport layer (HTL), an emission layer, an electron transport layer (ETL), and an electron injection layer (EIL). Some components of the light emitting unit 334 may be omitted depending on the structure and characteristics of the OLED display 100. Here, the emission layer may be an organic emission layer or an inorganic emission layer.

[0061] The hole injection layer is disposed on the anode 332 and serves to facilitate the injection of holes. The hole injection layer may be composed of, for example, one or more of HAT-CN (dipyrazino[2,3-f:2',3'-h]quinoxaline-2,3,6,7,10.11-hexacarbonitrile), CuPc (phthalocyanine), and NPD (N,N'-bis(naphthalene-1-yl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine).

[0062] The hole transport layer is disposed on the hole injection layer to smoothly transport holes to the light emitting layer. The hole transport layer may be composed of, for example, one or more of NPD (N,N'-bis(naphthalene-1-yl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine), TPD (N,N'-bis-(3-methylphenyl)-N,N'-bis-(phenyl)-benzidine), s-TAD (2,2',7,7'-tetrakis(N,N-dimethylamino)-9,9-spirofluorene), and MTDATA (4,4',4''-Tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine).

[0063] The light-emitting layer is disposed on the hole-transporting layer and can emit light of a specific color by including a material capable of emitting light of a specific color, and the light-emitting material can be formed using a phosphorescent material or a fluorescent material.

[0064] When the light-emitting layer emits red light, the peak wavelength of the emitted light may be in the range of 600 nm to 650 nm. The light-emitting layer may be composed of a host material including CBP (4,4'-bis(carbazol-9-yl)biphenyl) or mCP (1,3-bis(carbazol-9-yl)benzene) and a phosphorescent material including a dopant selected from PIQIr(acac) (bis(1-phenylisoquinoline)(acetylacetonate) iridium), PQIr(acac) (bis(1-phenylquinoline)(acetylacetonate) iridium), PQIr (tris(1-phenylquinoline) iridium), and PtOEP (octaethylporphyrin platinum). Alternatively, the light-emitting layer may be composed of a fluorescent material including PBD:Eu(DBM)3(Phen) or Perylene.

[0065] Here, the peak wavelength (λ) refers to the maximum wavelength of EL (ElectroLuminescence). The wavelength at which the light-emitting layer constituting the light-emitting unit emits its own light is called PL (PhotoLuminescence), and the light emitted under the influence of the thickness and optical characteristics of the layers constituting the light-emitting layer is called emittance. Here, EL (ElectroLuminescence) refers to the light ultimately emitted by an electroluminescent display device and can be expressed as the product of PL (PhotoLuminescence) and emittance.

[0066] When the light-emitting layer emits green light, the peak wavelength of the emitted light may be in the range of 520 nm to 540 nm, and the light-emitting layer may be made of a phosphorescent material containing a host material including CBP or mCP and a dopant material such as an Ir complex containing Ir(ppy)3 (tris(2-phenylpyridine)iridium), or a fluorescent material including Alq3 (tris(8-hydroxyquinolino)aluminum).

[0067] When the emitting layer emits blue light, the peak wavelength of the emitted light may be in the range of 440 nm to 480 nm, and the emitting layer may be composed of a phosphorescent material including a host material containing CBP or mCP and a dopant material containing FIrPic (bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium). Alternatively, the emitting layer may be composed of a fluorescent material including any one of spiro-DPVBi (4,4'-Bis(2,2-diphenyl-ethen-1-yl)biphenyl), DSA (1-4-di-[4-(N,N-diphenyl)amino]styryl-benzene), PFO (polyfluorene)-based polymers, and PPV (polyphenylenevinylene)-based polymers.

[0068] An electron transport layer is disposed on the light-emitting layer to facilitate electron transfer to the light-emitting layer. The electron transport layer may be composed of, for example, one or more of Liq (8-hydroxyquinolinolato-lithium), PBD (2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), TAZ (3-(4-biphenyl)4-phenyl-5-tert-butylphenyl-1,2,4-triazole), spiro-PBD, BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline), and Balq (bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminum).

[0069] An electron injection layer may be further disposed on the electron transport layer. The electron injection layer is an organic layer that facilitates electron injection from the cathode 336 and may be omitted depending on the structure and characteristics of the organic light-emitting display device 100. The electron injection layer may be an inorganic metal compound such as BaF2, LiF, NaCl, CsF, Li2O, or BaO, or may be one or more organic compounds such as HAT-CN (dipyrazino[2,3-f:2',3'-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile), CuPc (phthalocyanine), and NPD (N,N'-bis(naphthalene-1-yl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine).

[0070] An electron blocking layer or hole blocking layer that blocks the flow of holes or electrons may be further disposed adjacent to the light-emitting layer to prevent electrons from moving from the light-emitting layer to the adjacent hole transport layer when injected into the light-emitting layer, or holes from moving from the light-emitting layer to the adjacent electron transport layer when injected into the light-emitting layer, thereby improving luminous efficiency.

[0071] The cathode 336 is disposed on the light emitting portion 334 and serves to supply electrons to the light emitting portion 334. Since the cathode 336 must supply electrons, it may be made of a metal material such as magnesium (Mg), silver-magnesium (Ag:Mg), etc., which is a conductive material with a low work function, but is not limited thereto.

[0072] When the organic light-emitting display device 100 is a top-emission type, the cathode 336 may be a transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), and tin oxide (TiO).

[0073] An encapsulation part 350 is disposed on the light emitting element 330 to prevent the thin film transistor 320 and the light emitting element 330, which are components of the organic light emitting display device 100, from being oxidized or damaged by moisture, oxygen or impurities entering from the outside.

[0074] The encapsulation unit 350 may be formed by stacking a plurality of encapsulation layers 352 and 356, a foreign matter compensation layer 354, and a plurality of barrier films 358.

[0075] The first encapsulation layer 352 is disposed on the front surface of the thin film transistor 320 and the light emitting element 330 and may be made of, but is not limited to, inorganic materials such as silicon nitride (SiNx) or aluminum oxide (AlOz). A second encapsulation layer 356 may be further disposed on the foreign material compensation layer 354 disposed on the first encapsulation layer 352. The first encapsulation layer 352 may be formed through a process such as, but is not limited to, atomic layer deposition (ALD).

[0076] The first sealing layer 352 is adhered to the sides of the two inverted tapered second spacers 344 to fix the light emitting element 330, thereby preventing the light emitting element 330 from peeling off when placed in the folding area of ​​the flexible organic light emitting display device 100 and improving adhesion strength.

[0077] The foreign matter compensation layer 354 is disposed on the first encapsulation layer 352 and may be made of organic materials such as silicon oxycarbonate (SiOCz), acrylic, or epoxy resin, but is not limited thereto. When defects occur due to cracks caused by foreign matter or particles that may be generated during the process, the foreign matter compensation layer 354 can cover and compensate for the bends and foreign matter.

[0078] The barrier film 358 may be disposed on the encapsulation layers 352 and 356 and the foreign material compensation layer 354 to retard the penetration of oxygen and moisture from the outside into the organic light emitting display device 100. The barrier film 358 may be configured in the form of a film having translucency and double-sided adhesiveness, and may be made of any one of an olefin-based, acrylic-based, and silicon-based insulating material, or may be further laminated with a barrier film made of any one of a cycloolefin polymer (COP), a cycloolefin copolymer (COC), and a polycarbonate (PC), but is not limited thereto.

[0079] The organic light emitting display device 100 according to an embodiment of the present specification includes a flexible substrate including a display area including pixels and a non-display area on the periphery of the display area, a folding area in which the flexible substrate of the display area is folded, thin film transistors arranged on the display area, a bank layer arranged on the thin film transistors and partitioning pixels, a light emitting element arranged adjacent to the bank layer, at least one spacer and light emitting element having an inverted tapered structure arranged on the bank layer, and an encapsulant arranged on the first spacer and the second spacer.

[0080] FIG. 4 is a schematic cross-sectional view showing an example of a display device including a reflective visibility control film disposed on the display panel of FIG.

[0081] For reference, the description of the components disclosed in FIG. 4 that is the same as or overlaps with the above description may be omitted.

[0082] 4, a display device according to an embodiment of the present specification includes a display panel 110 and a reflection visibility control film 200 disposed on the display panel 110. In this case, the reflection visibility control film 200 may include a first layer 201, a barrier film 202 on the first layer 201, and a second layer 203 on the barrier film 202.

[0083] In this case, the display panel may be a panel having the pixels shown in Figure 3 and described in detail in Figures 1 and 2. The display panel 110 may be an organic light emitting display panel, but is not limited thereto.

[0084] The display panel 110 may have a reflectance equal to or less than a first reflectance for light of a reference wavelength. For example, the display panel 110 may have a reflectance greater than 0% and equal to or less than 10% for light of a wavelength of 550 nm. Furthermore, the reflectance of the display panel in the first wavelength range may be less than the reflectance of the display panel 110 in a third wavelength range.

[0085] That is, the display panel 110 may have a reflectance equal to or less than the first reflectance, a 1-1 reflectance at a first reference wavelength, and a 1-2 reflectance at a second reference wavelength, where the 1-1 reflectance may be greater than the 1-2 reflectance.

[0086] For example, the first reference wavelength may be 650 nm to 680 nm, and the second reference wavelength may be 420 nm to 440 nm. That is, the first reflectance of the display panel 110 at wavelengths of 650 nm to 680 nm may be greater than the first reflectance of the display panel 110 at wavelengths of 420 nm to 440 nm. In this manner, the display panel 110 reflects more light of red wavelengths. Therefore, the display panel 110 in this specification may be a panel having a red black visual sensation.

[0087] The first layer 201 may have a particular transmittance range for light in a particular wavelength range. The first layer 201 may have a first transmittance in the first wavelength range, a second transmittance in a second wavelength range different from the first wavelength range, and a third transmittance in a third wavelength range different from the first wavelength range and the second wavelength range.

[0088] For example, the first wavelength range may be a wavelength range corresponding to blue light within the wavelength range of visible light. The second wavelength range may be a wavelength range corresponding to green light within the wavelength range of visible light. The third wavelength range may be a wavelength range corresponding to red light within the wavelength range of visible light. For example, the first wavelength range may be 430 nm or more and less than 480 nm, the second wavelength range may be 480 nm or more and less than 630 nm, and the third wavelength range may be 630 nm or more and less than 780 nm.

[0089] The first layer 201 is a layer containing a pigment, and may be a layer containing not only a pigment but also a pressure sensitive adhesive (PSA).

[0090] As an example of the first layer 201, Case 1 to Case 3 are as follows.

[0091] As an example, the first wavelength range may be equal to or greater than 430 nm and less than 480 nm, the second wavelength range may be equal to or greater than 480 nm and less than 630 nm, and the third wavelength range may be equal to or greater than 630 nm and less than 780 nm.

[0092] In this case, the first transmittance may be 63%±2%, preferably 63%±1%, the second transmittance may be 58%±2%, preferably 58%±1%, and the third transmittance may be 60%±2%, preferably 60%±1% (hereinafter referred to as Case 1).

[0093] In Case 1, the WCT (White Color Temperature) luminance of the display device may be 100% or more and 107% or less, and the CCT (Correlated Color Temperature) of the display device may be 9,000 K or more and 11,000 K or less. Also, in a preferred embodiment of Case 1, the WCT (White Color Temperature) luminance of the display device may be 105.0%, and the CCT (Correlated Color Temperature) of the display device may be 9,965 K.

[0094] As another example, when the first wavelength range is 430 nm or more and less than 480 nm, the second wavelength range is 480 nm or more and less than 630 nm, and the third wavelength range is 630 nm or more and less than 780 nm, the first transmittance may be 66% ± 2%, preferably 66% ± 1%, the second transmittance may be 60% ± 2%, preferably 60% ± 1%, and the third transmittance may be 66% ± 1% (hereinafter referred to as Case 2).

[0095] In Case 2, the WCT (White Color Temperature) luminance of the display device may be 100% or more and 105% or less, and the CCT (Correlated Color Temperature) of the display device may be 9,000 K or more and 11,000 K or less. Also, in a preferred embodiment of Case 2, the WCT (White Color Temperature) luminance of the display device may be 104.7% and the CCT (Correlated Color Temperature) of the display device may be 10,691 K.

[0096] As another example, when the first wavelength range is 430 nm or more and less than 480 nm, the second wavelength range is 480 nm or more and less than 630 nm, and the third wavelength range is 630 nm or more and less than 780 nm, the first transmittance may be 63% ± 2%, preferably 63% ± 1%, the second transmittance may be 60% ± 2%, preferably 60% ± 1%, and the third transmittance may be 63% ± 2%, preferably 63% ± 1% (hereinafter, Case 3).

[0097] In Case 3, the WCT (White Color Temperature) luminance of the display device may be 100% or more and 105% or less, and the CCT (Correlated Color Temperature) of the display device may be 9,000 K or more and 11,000 K or less. Also, in a preferred embodiment of Case 3, the WCT (White Color Temperature) luminance of the display device may be 103.7% and the CCT (Correlated Color Temperature) of the display device may be 9,901 K.

[0098] The barrier film 202 is disposed on the first layer 201 and may include triacetyl cellulose (TAC) or an acrylic resin as a support member. Specifically, the barrier film 202 may have a retardation value of 100 nm or less. In this case, the retardation value (Δnd) may be defined as the product of the thickness (d) of the barrier film 202 and the refractive index anisotropy (Δn) of the triacetyl cellulose (TAC) or acrylic resin that constitutes the barrier film 202.

[0099] The second layer 203 may be disposed on the barrier film 202. The second layer 203 may have a reflectance equal to or less than a second reflectance at a reference wavelength. As an example, the second layer 203 may have a reflectance of 0.5% or less at a wavelength of 550 nm. The second layer 203 may also have a minimum reflectance at a wavelength of 550 nm. That is, the reflectance of the second layer 203 may be minimum when the wavelength of incident light is 550 nm. The transmittance of the second layer 203 may be 99% or more.

[0100] The second layer 203 is a low-reflection coating layer and may be a commonly used low-reflection coating layer. For example, the second layer 203 may be a single layer or a multi-layer structure including at least two layers. The second layer 203 may include manganese (Mn) or nitride, which are known as low-reflection materials. For reference, the same second layer 203 may be used in the above-described Cases 1 to 3.

[0101] In Case 1 to Case 3, the first layer 201 can include the first to fourth dyes.

[0102] Of the total weight of the first layer 201, the first to fourth dyes may be contained in an amount of approximately 1% by weight, and the first layer 201 may also contain 1% by weight of additives, 83% by weight of basic adhesive, etc.

[0103] In Cases 1 to 3, the first dye may preferably be a dye having a maximum absorption wavelength of about 480 nm. As an example, the first dye may be a pyrromethene cobalt complex dye.

[0104] In Cases 1 to 3, the second dye may preferably be a dye having a maximum absorption wavelength of about 580 nm. As an example, the second dye may be a tetraazaporphyrin copper complex dye.

[0105] In Cases 1 to 3, the third dye may preferably be a dye having a maximum absorption wavelength of about 680 nm. As an example, the third dye may be a phthalocyanine cobalt complex dye.

[0106] In Cases 1 to 3, the fourth dye may preferably be a dye having a maximum absorption wavelength of about 780 nm. As an example, the fourth dye may be a phthalocyanine copper complex dye.

[0107] As an example, the examples for Case 1 to Case 3 are as follows.

[0108] In Case 1, the first layer 201 can contain 0.35 to 0.39 wt % of a first dye having a maximum absorption wavelength in the range of 470 nm to 490 nm, 0.38 to 0.42 wt % of a second dye having a maximum absorption wavelength in the range of 570 nm to 590 nm, 0.38 to 0.42 wt % of a third dye having a maximum absorption wavelength in the range of 670 nm to 690 nm, and 0.38 to 0.42 wt % of a fourth dye having a maximum absorption wavelength in the range of 770 nm to 790 nm.

[0109] In Case 2, the first layer 201 can contain 0.32 to 0.34 wt % of a pyrromethene cobalt complex dye, 0.38 to 0.42 wt % of a tetraazaporphyrin copper complex dye, 0.32 to 0.36 wt % of a phthalocyanine cobalt complex dye, and 0.32 to 0.36 wt % of a phthalocyanine copper complex dye.

[0110] In Case 3, the composition may contain 0.35 to 0.39% by weight of a pyrromethene cobalt complex dye, 0.38 to 0.42% by weight of a tetraazaporphyrin copper complex dye, 0.38 to 0.42% by weight of a phthalocyanine cobalt complex dye, and 0.38 to 0.42% by weight of a phthalocyanine copper complex dye.

[0111] As a preferred embodiment, the embodiments for Case 1 to Case 3 are as follows.

[0112] In Case 1, the first layer 201 can include 0.37% by weight of the first dye, 0.40% by weight of the second dye, 0.40% by weight of the third dye, and 0.40% by weight of the fourth dye.

[0113] In Case 2, the first layer 201 may contain 0.34% by weight of the first dye, 0.40% by weight of the second dye, 0.34% by weight of the third dye, and 0.34% by weight of the fourth dye.

[0114] In Case 3, the first layer 201 can include 0.37% by weight of the first dye, 0.40% by weight of the second dye, 0.40% by weight of the third dye, and 0.40% by weight of the fourth dye.

[0115] Furthermore, as a preferred embodiment, the embodiments for Case 1 to Case 3 are as follows.

[0116] The first dye is a pyrromethene cobalt complex dye and may be composed of a compound represented by the following Chemical Formula 1: [ka]

[0117] The second dye is a tetraazaporphyrin copper complex dye and may be composed of a compound represented by the following Chemical Formula 2. The following compound is a product of Yamamoto Chemical Industry Co., Ltd., and its product name is PD-311S, and its maximum absorption wavelength may be about 480 nm. [ka] In Chemical Formula 2, R1 to R8 each represent a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxy group, an amino group, a carboxyl group, a sulfonate group, a straight-chain branched or cyclic alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a monoalkylamino group having 1 to 20 carbon atoms, a dialkylamino group having 2 to 20 carbon atoms, a dialkylamino group having 7 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a heteroaryl group, an alkylthio group having 6 to 20 carbon atoms, and an arylthio group, each of which has 6 to 20 carbon atoms; or, in Chemical Formula 2, R1 to R8 each represent a ring other than an aromatic ring in which atoms or groups are linked via a linking group, and M represents two hydrogen atoms, a divalent metallic atom, a divalent monosubstituted metallic atom, a tetravalent disubstituted metallic atom, or a tetravalent It refers to a disubstituted metallic atom or an oxy metallic atom.

[0118] The third dye is a phthalocyanine cobalt complex dye and may be composed of a compound represented by Chemical Formula 3. The following compound is a product of Yamada Chemical Co., Ltd., and its product name is FDR-002, and its maximum absorption wavelength may be about 680 nm. [ka]

[0119] The fourth dye is a phthalocyanine copper complex dye, and may be composed of a compound represented by the following chemical formula 4. The following compound is a product of Yamada Chemical Co., Ltd., and its product name is FDN-002, and its maximum absorption wavelength may be about 780 nm. [ka] However, the phthalocyanine copper complex dye is a mixed crystal form of α and β forms, m represents the average number of chlorine substituents at the α-position, and n represents the average number of chlorine substituents at the β-position.

[0120] FIG. 5 is a schematic cross-sectional view showing another example of a display device including a reflective visibility control film disposed on the display panel of FIG.

[0121] For reference, the description of the components disclosed in FIG. 4 that is the same as or overlaps with the above description may be omitted.

[0122] Referring to FIG. 5, the reflective visibility control film 200 disposed on the display panel 110 may include a first layer 201 including a first layer 201a and a first layer 201b.

[0123] The 1-1 layer 201a may be a layer containing the pressure sensitive adhesive (PSA) described above. In this case, the 1-1 layer 201a does not need to contain the first to fourth dyes described above.

[0124] The first-second layer 201b may be a hard coating layer. In this case, the first-second layer 201b may contain the first to fourth dyes described above. The dyes exemplified in Cases 1 to 3 described above may be included in the first-second layer 201b.

[0125] The first-second layer 201b may be a commonly used hard coating layer having a light transmittance of 96%. The hard coating layer is located on the first-first layer 201a to protect the display panel and the first-first layer 201a and prevent them from being damaged by external physical forces. That is, the hard coating layer is formed on the outermost periphery of the display device to protect the display panel and the first-first layer 201a.

[0126] The hard coating layer may be formed as a single layer or as a multi-layer structure of two or more layers. The material of the hard coating layer is not particularly limited, and various materials used in the art to improve the surface hardness of plastic films may be used without limitation. The thickness of the hard coating layer may be, for example, about 5 μm to 100 μm, preferably about 6 μm to 50 μm, but is not limited thereto.

[0127] 6 is a graph showing measured transmittance for each wavelength for Case 1 to Case 3 of the first layer constituting the reflective visibility control film used in the display device according to one embodiment of the present invention. That is, the graph in FIG. 6 shows measured transmittance for wavelengths from 380 nm to 780 nm.

[0128] The first layer of Cases 1 to 3 can contain the first to fourth dyes in the above-mentioned ratios. Compared to the comparative examples of the standard HTO and Flat OTF, there is a 3 to 6% improvement in transmittance at short wavelengths, and there is also a 3 to 6% improvement in transmittance at long wavelengths.

[0129] For reference, HTO is a display device used as a low-reflection film including a retardation layer, a barrier layer, and a polarizer layer, and may have an average transmittance of about 45.5% in the first to third wavelength ranges. Flat OTF is a low-reflection film having a flat transmittance graph in the first to third wavelength ranges, unlike Cases 1 to 3, and may have an average transmittance of about 60%.

[0130] Referring to FIG. 6, it can be seen that Cases 1 to 3 have generally improved transmittance in the range of short and long wavelength visible light compared to the reference HTO (45.5%) and Flat OTF (60%).

[0131] In particular, the transmittance of Cases 1 to 3 was improved over the reference HTO (45.5%) in all wavelength ranges. In other words, it was confirmed that by incorporating the first to fourth dyes described above into the first layer, the transmittance was improved in a specific wavelength range.

[0132] Furthermore, Cases 1 to 3 have transmittances that are approximately 3 to 6% higher in the first wavelength range (430 nm to 480 nm), which is a shorter wavelength range, than the reference Flat OTF (60%). Also, Cases 1 to 3 have transmittances that are approximately 3 to 6% higher in the third wavelength range (630 nm to 780 nm), which is a longer wavelength range, than the reference Flat OTF (60%). As a result, Cases 1 to 3 have improved transmittances in the first and third wavelength ranges compared to the reference Flat OTF (60%).

[0133] 7 is a table showing optical characteristics of the reflective visibility control film including the first layer of the above-mentioned Cases 1 to 3. Referring to FIG. 7, Comparative Example 1 is a first layer having a flat transmittance of 60% and an R layer on a first display panel in which the external light reflective visibility appears in the blue series (Bluish). 550 The structure is one in which a low-reflection film including a second layer with a transmittance of 1.0% is disposed. The first display panel is a comparative example that is not a display panel used in the display device of the present invention, and its reflectance at wavelengths of 650 nm to 680 nm is lower than its reflectance at wavelengths of 420 nm to 440 nm. As a result, even when a conventional first layer with a flat transmittance of 60% is used on the first display panel, the external light reflection luminance appears bluish. It appears that the basic reflectance of the first display panel is low, and therefore the overall reflectance is also measured relatively low.

[0134] In Comparative Example 2, the first layer and the R layer having a flat transmittance of 60% are disposed on the second display panel, in which the external light reflection luminance appears in the reddish series (Reddish). 550The first display panel is a display panel used in the display device of the present invention, and has a reflectance at wavelengths of 650 nm to 680 nm that is higher than the reflectance at wavelengths of 420 nm to 440 nm. When a first layer having a flat transmittance of 60% is used on a second display panel having a reddish external light reflection luminance, the resulting image may be closer to neutral black than in Comparative Example 1. However, the a* and b* color coordinate values ​​are far from (5, -5), and it can be seen that a reddish luminance is still observed.

[0135] In Case 1, compared to Comparative Example 2, the external light reflection luminance appears in the reddish series (reddish), and the first layer having a preset transmittance as shown in the table of FIG. 7 is provided on the second display panel. 550 A reflective visibility control film containing a second layer with a reflectance of 0.5% was placed. Y / R 550 ) was 2.6 / 2.6, which was better than Comparative Example 2 and similar to Comparative Example 1. Meanwhile, when compared to Comparative Example 2, Case 1 was confirmed to be a little closer to neutral black than Comparative Example 2, as the a* and b* color coordinate values ​​were closer to (5, -5).

[0136] For reference, in this specification, black luminance may refer to how similar a color temperature measured when a perfect black image is displayed on a display device is to perfect black.

[0137] It is also confirmed that the WCT luminance of Case 1 is higher than that of Comparative Example 2, which is the reference.

[0138] For reference, the reflectance R Y is the average value of the reflectance over the wavelength range used in the experiment, and the reflectance R 550 is the reflectance for light of 550 nm, one of the wavelengths used in the experiment.

[0139] In Case 2, a reflective visibility control film including a first layer having a predetermined transmittance and a second layer having a transmittance of 0.5% as shown in the table of FIG. 7 was placed on a second display panel in which the reflective visibility of external light appeared in the reddish series. Y / R 550 ) was 2.6 / 2.5, which was similar to Comparative Examples 2 and 1. Meanwhile, when compared to Comparative Example 2, Case 2 had a* and b* color coordinate values ​​closer to (5, -5), which confirmed that it was a little closer to neutral black than Comparative Example 2. It was also confirmed that the WCT luminance of Case 2 was higher than that of Comparative Example 2, which is the reference.

[0140] In Case 3, a reflective visibility control film including a first layer having a preset transmittance and a second layer having a transmittance of 0.5% as shown in the table of FIG. 7 was placed on a second display panel in which the reflective visibility of external light appeared in the reddish series. Y / R 550 ) was 2.6 / 2.5, which was superior to Comparative Example 2 and similar to Comparative Example 1. Meanwhile, compared to Comparative Example 2, Case 3 was found to have a* and b* color coordinate values ​​of (5.0, -5.4), which was closest to neutral black. Additionally, the WCT luminance of Case 3 was also found to be higher than that of Comparative Example 2, which is the reference.

[0141] In Comparative Example 3, a film including a first layer having a preset transmittance as shown in the table of FIG. 7 and a second layer having a transmittance of 0.5% was placed on a second display panel in which the external light reflection luminance appeared in the reddish series. In Comparative Example 3, the first layer had a higher transmittance in the first wavelength range of 430 nm or more and less than 480 nm compared to Cases 1 to 3. In this case, the reflectance (R Y / R 550) was 2.6 / 2.5, which was superior to Comparative Example 2 and similar to Comparative Example 1. However, when examining the CCT, it was found to have an excessively high value compared to Cases 1 to 3, and the a* and b* color coordinate values ​​were (7.1, -8.7), indicating a blue-based black visual impression. In addition, it was found that the WCT luminance of Comparative Example 3 was even lower than that of Comparative Example 2, which is the reference.

[0142] In FIG. 7, in the hue coordinates, a* is a coordinate value based on the red-green axis, and b* is a coordinate value based on the yellow-blue axis. The origin where a* = 0 and b* = 0 indicates that the reflection saturation is neutral black. As a* has a positive (+) value with a large absolute value from the origin, the red tendency becomes stronger, and as a* has a negative (-) value with a large absolute value, the green tendency becomes stronger. Also, as b* moves in the positive (+) direction from the origin (0), the yellow tendency becomes stronger, and as it moves in the negative (-) direction, the blue tendency becomes stronger. In other words, as the a* coordinate value has a positive (+) value with a large absolute value and the b* coordinate value has a negative (-) value or a positive (+) value with a small absolute value, the display device being measured for hue has a reddish black visual sensation. Also, when the a* coordinate value has a positive (+) value and the b* coordinate value has a negative (-) value, neutral black can be obtained even if the absolute values ​​of the a* coordinate value and the b* coordinate value are similar.

[0143] The b* coordinate values ​​of Comparative Examples 1 and 3 have the largest absolute negative (-) value, and therefore can be said to have a blue-based black visual sensation.

[0144] Conversely, the a* coordinate values ​​of Comparative Example 2 and Cases 1 to 3 have positive (+) values, and the b* coordinate values ​​have negative (-) values ​​with relatively small absolute values. Therefore, Comparative Example 2, Comparative Example 4, and Cases 1 to 3 can be said to have a reddish black visual sensation.

[0145] In particular, it can be analyzed that the closer the a* and b* coordinate values ​​of the display device subjected to hue measurement are to (5, -5), the more preferable the neutral black visual impression of the display device. Therefore, Cases 1 to 3 have a more neutral black than Comparative Example 1. On the other hand, Cases 1 to 3 have lower reflectance and improved WCT luminance than Comparative Example 2, and therefore it is confirmed that Cases 1 to 3 have the best optical properties.

[0146] As described above, Cases 1 to 3 have advantages over Comparative Examples 1 to 4 in that they have better reflectance (low reflectance), have black visual sensation close to neutral black, and have high WCT luminance.

[0147] In other words, if a reflective luminosity control film including a first layer and a second layer (and a barrier film between the first and second layers) is laminated on a second display panel that primarily reflects red-series light as in Cases 1 to 3, a display device with a more desirable black luminosity close to neutral black and high light efficiency can be manufactured. Figure 8 is a table showing the optical characteristics of Case 3 according to the reflectance of the second layer.

[0148] Referring to Figure 8, the reflectance of the second layer, R 550 The optical characteristics of the first layer are as follows: (reflectance at a wavelength of 550 nm) is 0.5% and 1.0%. 550 It can be seen that when only R is changed, a difference occurs in the overall reflectance. 550 When the total reflectance is 0.5%, R 550 It is confirmed that the total reflectance is lower than that when R is 1.0%. 550 The reflectance characteristic when R is 0.5% is 550 is better than the overall reflectance characteristics when the reflectance is 1.0%.

[0149] Not only that, but the second layer R 550 The hue when is 0.5% is the R of the second layer.550 It is confirmed that the black visual impression is closer to neutral black than the hue when the value is 1.0%.

[0150] FIG. 9 is a table showing optical properties of Comparative Examples 5 to 7, which are further comparative examples, and a comparative example of an HTO structure.

[0151] Referring to FIG. 9, it is confirmed that in the HTO structure, the hue is between reddish black visual sensation and blueish black visual sensation.

[0152] Comparative Examples 5 to 7 may be display devices using a first layer having a transmittance different from that of the above-described Cases 1 to 3. In Comparative Examples 5 and 7, the first transmittance range to the third transmittance range are different from those of Cases 1 to 3. It is confirmed that the WCT luminance of Comparative Examples 5 and 7 is lower than that of the reference Comparative Example 1. It is also confirmed that the CCT of Comparative Examples 6 and 7 is significantly lower than 9000.

[0153] Comparing the optical characteristics of each example with reference to FIGS. 7 to 9, it is confirmed that the optical characteristics of Cases 1 to 3, which are the main examples of this specification, are superior to those of the other comparative examples.

[0154] Display devices according to various embodiments of the present invention can be described as follows.

[0155] A display device according to one embodiment of the present invention includes a display panel having a first-1 reflectance at wavelengths of 650 nm to 680 nm that is greater than a first-2 reflectance at wavelengths of 420 nm to 440 nm, a first layer disposed on the display panel and having a first transmittance in a first wavelength range, a second transmittance in a second wavelength range different from the first wavelength range, and a third transmittance in a third wavelength range different from the first wavelength range and the second wavelength range, a barrier film disposed on the first layer, and a second layer disposed on the barrier film.

[0156] According to another feature of the present invention, the first wavelength range is equal to or greater than 430 nm and less than 480 nm, the second wavelength range is equal to or greater than 480 nm and less than 630 nm, and the third wavelength range is equal to or greater than 630 nm and less than 780 nm, and the first transmittance may be greater than the second transmittance.

[0157] According to yet another aspect of the invention, the first transmittance may be 63%±2%, the second transmittance may be 58%±2%, and the third transmittance may be 60%±2%.

[0158] According to another aspect of the invention, the first transmittance may be 66%±2%, the second transmittance may be 60%±2%, and the third transmittance may be 66%±2%.

[0159] According to yet another aspect of the invention, the first transmittance may be 63%±2%, the second transmittance may be 60%±2%, and the third transmittance may be 63%±2%.

[0160] According to another aspect of the present invention, the reflectance of the display panel at a wavelength of 550 nm may be 10% or less.

[0161] According to another aspect of the invention, the reflectance of the second layer at a wavelength of 550 nm may be 0.5% or less for a wavelength of 550 nm.

[0162] According to another feature of the present invention, the reflectance of the second layer may have a minimum value when the wavelength range of incident light is 540 nm to 560 nm.

[0163] According to another aspect of the invention, the transmittance of the second layer may be 99% or more.

[0164] According to another aspect of the present invention, the barrier film may include triacetyl cellulose (TAC) or an acrylic resin.

[0165] According to yet another feature of the present invention, the barrier film may have a retardation value of 100 nm or less.

[0166] According to another feature of the present invention, the first layer comprises a first dye having a maximum absorption wavelength in the range of 470 nm to 490 nm, a second dye having a maximum absorption wavelength in the range of 570 nm to 590 nm, a third dye having a maximum absorption wavelength in the range of 670 nm to 690 nm, and a fourth dye having a maximum absorption wavelength in the range of 770 nm to 790 nm.

[0167] According to another feature of the present invention, the first layer contains 0.35 to 0.39 wt % of a first dye, 0.38 to 0.42 wt % of a second dye, 0.38 to 0.42 wt % of a third dye, and 0.38 to 0.42 wt % of a fourth dye.

[0168] According to another feature of the present invention, the first layer contains 0.32 to 0.34 wt % of a first dye, 0.38 to 0.42 wt % of a second dye, 0.32 to 0.36 wt % of a third dye, and 0.32 to 0.36 wt % of a fourth dye.

[0169] According to another feature of the present invention, the first layer contains 0.35 to 0.39 wt % of a first dye, 0.38 to 0.42 wt % of a second dye, 0.38 to 0.42 wt % of a third dye, and 0.38 to 0.42 wt % of a fourth dye.

[0170] The first dye is a pyrromethene cobalt complex dye and may be composed of a compound represented by the following Chemical Formula 1:

[0171] [ka]

[0172] According to another feature of the present invention, the second dye is a tetraazaporphyrin copper complex dye and may be composed of a compound represented by the following Chemical Formula 2: [ka]

[0173] According to another feature of the present invention, the third dye is a phthalocyanine cobalt complex dye and may be composed of a compound represented by the following Chemical Formula 3: [ka]

[0174] According to another feature of the present invention, the fourth dye is a phthalocyanine copper complex dye and may be composed of a compound represented by the following Chemical Formula 4: [ka]

[0175] According to yet another feature of the present invention, the first layer may further comprise a pressure sensitive adhesive (PSA).

[0176] According to another feature of the present invention, the first layer may include a 1-1 layer made of a pressure-sensitive adhesive and a 1-2 layer including a first dye, a second dye, a third dye, a fourth dye, and a hard coating material.

[0177] A display device according to another embodiment of the present invention includes a display panel having a first reflectance at wavelengths of 650 nm to 680 nm that is greater than a second reflectance at wavelengths of 420 nm to 440 nm, and a reflective visibility adjustment film arranged on the display panel, wherein the reflective visibility adjustment film includes a first layer having a first transmittance in a first wavelength range, a second transmittance in a second wavelength range, and a third transmittance in a third wavelength range, and a second layer arranged on the first layer and having a reflectance at a wavelength of 550 nm that does not exceed 1%, and the first wavelength range, the second wavelength range, and the third wavelength range are different from each other.

[0178] According to another feature of the invention, the reflectivity may not exceed 0.5%.

[0179] A display device according to yet another embodiment of the present invention includes a display panel having reddish ambient light reflection luminance, a first layer on the display panel, and a second layer on the display panel, wherein the first layer includes a first dye having a maximum absorption wavelength in the range of 470 nm to 490 nm, a second dye having a maximum absorption wavelength in the range of 570 nm to 590 nm, a third dye having a maximum absorption wavelength in the range of 670 nm to 690 nm, and a fourth dye having a maximum absorption wavelength in the range of 770 nm to 790 nm.

[0180] According to another feature of the present invention, the reflectance of the second layer can have a minimum value when the wavelength range of the incident light is 540 nm to 560 nm.

[0181] Although the present invention has been described in detail above with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments and may be variously modified within the scope of the technical concept of the present invention. Therefore, the disclosed embodiments are for illustrative purposes only and do not limit the technical concept of the present invention. Therefore, the above-described embodiments should be understood to be illustrative in all respects and not restrictive. The scope of the present invention should be interpreted by the following claims, and all technical concepts within the scope equivalent thereto should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0182] 100 display device 110 Display panel 120 Optical Components 130 Window components 200 Reflection Visibility Control Film 201 1st Layer 201a 1 layer 201b 2 layer 202 Barrier Film 203 Second Layer 310 Substrate 312 Buffer Layer 314 First insulating layer 316 Second insulating layer 318 Planarization layer 320 Thin Film Transistor 322 gate electrode 324 Source Electrode 326 Drain electrode 328 Semiconductor Layer 330 Light-emitting element 332 Anode 334 Light-emitting part 336 Cathode 340 bank layer 350 Sealing part 352 First sealing layer 354 Foreign matter compensation layer 356 Second sealing layer 358 Barrier Film DA display area NDA Hidden Area FA folding region NFA non-folding region FX folding axis

Claims

1. a display panel having a first-1 reflectance at a wavelength of 650 nm to 680 nm that is greater than a first-2 reflectance at a wavelength of 420 nm to 440 nm; a first layer disposed on the display panel, the first layer having, at an interface between the display panel and the first layer, a first transmittance in a first wavelength range, a second transmittance in a second wavelength range different from the first wavelength range, and a third transmittance in a third wavelength range different from the first wavelength range and the second wavelength range, for light incident from the display panel side; a barrier film disposed on the first layer; a second layer disposed on the barrier film; the first wavelength range is equal to or greater than 430 nm and less than 480 nm, the second wavelength range is equal to or greater than 480 nm and less than 630 nm, and the third wavelength range is equal to or greater than 630 nm and less than 780 nm; The display device, wherein the first transmittance is 63%±2%, the second transmittance is 58%±2%, and the third transmittance is 60%±2%.

2. a display panel having a first-1 reflectance at a wavelength of 650 nm to 680 nm that is greater than a first-2 reflectance at a wavelength of 420 nm to 440 nm; a first layer disposed on the display panel, the first layer having, at an interface between the display panel and the first layer, a first transmittance in a first wavelength range, a second transmittance in a second wavelength range different from the first wavelength range, and a third transmittance in a third wavelength range different from the first wavelength range and the second wavelength range, for light incident from the display panel side; a barrier film disposed on the first layer; a second layer disposed on the barrier film; the first wavelength range is equal to or greater than 430 nm and less than 480 nm, the second wavelength range is equal to or greater than 480 nm and less than 630 nm, and the third wavelength range is equal to or greater than 630 nm and less than 780 nm; The display device, wherein the first transmittance is 66%±2%, the second transmittance is 60%±2%, and the third transmittance is 66%±2%.

3. a display panel having a first-1 reflectance at a wavelength of 650 nm to 680 nm that is greater than a first-2 reflectance at a wavelength of 420 nm to 440 nm; a first layer disposed on the display panel, the first layer having, at an interface between the display panel and the first layer, a first transmittance in a first wavelength range, a second transmittance in a second wavelength range different from the first wavelength range, and a third transmittance in a third wavelength range different from the first wavelength range and the second wavelength range, for light incident from the display panel side; a barrier film disposed on the first layer; a second layer disposed on the barrier film; the first wavelength range is equal to or greater than 430 nm and less than 480 nm, the second wavelength range is equal to or greater than 480 nm and less than 630 nm, and the third wavelength range is equal to or greater than 630 nm and less than 780 nm; The display device, wherein the first transmittance is 63%±2%, the second transmittance is 60%±2%, and the third transmittance is 63%±2%.

4. 4. The display device according to claim 1, wherein the reflectance of the display panel at a wavelength of 550 nm is 10% or less.

5. 4. The display device according to claim 1, wherein the barrier film contains triacetyl cellulose (TAC) or an acrylic resin.

6. The display device according to claim 5 , wherein the barrier film has a retardation value of 100 nm or less.

7. a display panel having a first-1 reflectance at a wavelength of 650 nm to 680 nm that is greater than a first-2 reflectance at a wavelength of 420 nm to 440 nm; a first layer disposed on the display panel, the first layer having, at an interface between the display panel and the first layer, a first transmittance in a first wavelength range, a second transmittance in a second wavelength range different from the first wavelength range, and a third transmittance in a third wavelength range different from the first wavelength range and the second wavelength range, for light incident from the display panel side; a barrier film disposed on the first layer; a second layer disposed on the barrier film; the first wavelength range is equal to or greater than 430 nm and less than 480 nm, the second wavelength range is equal to or greater than 480 nm and less than 630 nm, and the third wavelength range is equal to or greater than 630 nm and less than 780 nm; the first layer includes a first dye having a maximum absorption wavelength in the range of 470 nm to 490 nm, a second dye having a maximum absorption wavelength in the range of 570 nm to 590 nm, a third dye having a maximum absorption wavelength in the range of 670 nm to 690 nm, and a fourth dye having a maximum absorption wavelength in the range of 770 nm to 790 nm.

8. 8. The display device according to claim 7, wherein the first layer contains 0.35 to 0.39% by weight of the first dye, 0.38 to 0.42% by weight of the second dye, 0.38 to 0.42% by weight of the third dye, and 0.38 to 0.42% by weight of the fourth dye.

9. 8. The display device according to claim 7, wherein the first layer contains 0.32 to 0.34% by weight of the first pigment, 0.38 to 0.42% by weight of the second pigment, 0.32 to 0.36% by weight of the third pigment, and 0.32 to 0.36% by weight of the fourth pigment.

10. The display device of claim 8 , wherein the first dye is a pyrromethene cobalt complex dye and is formed of a compound represented by the following Chemical Formula 1: 【Chemistry 1】

11. The display device of claim 9 , wherein the first dye is a pyrromethene cobalt complex dye and is formed of a compound represented by the following Chemical Formula 1: 【Chemistry 1】

12. The second dye is a tetraazaporphyrin copper complex dye and is composed of a compound represented by the following Chemical Formula 2: 【Chemistry 2】 In the formula 2, R1 to R8 each represent a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxy group, an amino group, a carboxyl group, a sulfonate group, a straight-chain branched or cyclic alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a monoalkylamino group having 1 to 20 carbon atoms, a dialkylamino group having 2 to 20 carbon atoms, a dialkylamino group having 7 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a heteroaryl group, an alkylthio group having 6 to 20 carbon atoms, and an arylthio group having 6 to 20 carbon atoms; or, in the formula 2, R1 to R8 each represent a ring other than an aromatic ring to which the atoms or groups are connected via a linking group, and M represents two hydrogen atoms, a divalent metal atom, 9. The display device of claim 8, wherein the metal atom is a divalent monosubstituted metal atom, a tetravalent dissubstituted metal atom, or an oxymetal atom.

13. The second dye is a tetraazaporphyrin copper complex dye and is composed of a compound represented by the following Chemical Formula 2: 【Chemistry 2】 In the formula 2, R1 to R8 each represent a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxy group, an amino group, a carboxyl group, a sulfonate group, a straight-chain branched or cyclic alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a monoalkylamino group having 1 to 20 carbon atoms, a dialkylamino group having 2 to 20 carbon atoms, a dialkylamino group having 7 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a heteroaryl group, an alkylthio group having 6 to 20 carbon atoms, and an arylthio group having 6 to 20 carbon atoms; or, in the formula 2, R1 to R8 each represent a ring other than an aromatic ring to which the atoms or groups are connected via a linking group, and M represents two hydrogen atoms, a divalent metal atom, 10. The display device of claim 9, wherein the metal atom is a divalent monosubstituted metal atom, a tetravalent dissubstituted metal atom, or an oxymetal atom.

14. The display device of claim 8 , wherein the third dye is a phthalocyanine cobalt complex dye and is formed of a compound represented by the following chemical formula 3: 【Transformation 3】

15. The display device of claim 9 , wherein the third dye is a phthalocyanine cobalt complex dye and is formed of a compound represented by the following chemical formula 3: 【Transformation 3】

16. The fourth dye is a phthalocyanine copper complex dye and is composed of a compound represented by the following chemical formula 4: 【Chemistry 4】 The display device according to claim 8, wherein the phthalocyanine copper complex dye has a mixed crystal form of α and β forms, m represents the average number of chlorine substituents at the α-positions, and n represents the average number of chlorine substituents at the β-positions.

17. The fourth dye is a phthalocyanine copper complex dye and is composed of a compound represented by the following chemical formula 4: 【Chemistry 4】 The display device according to claim 9, wherein the phthalocyanine copper complex dye has a mixed crystal form of α and β forms, m represents the average number of chlorine substituents at the α-positions, and n represents the average number of chlorine substituents at the β-positions.

18. 8. The display device of claim 7, wherein the first layer further comprises a pressure sensitive adhesive (PSA).

19. the first layer is a 1-1 layer made of a pressure-sensitive adhesive; and 8. The display device of claim 7, further comprising a first and second layer including the first dye, the second dye, the third dye, the fourth dye, and a hard coating material.

20. a display panel having reddish ambient light reflection visibility; a first layer on the display panel; a second layer on the display panel; the first layer includes a first dye having a maximum absorption wavelength in the range of 470 nm to 490 nm, a second dye having a maximum absorption wavelength in the range of 570 nm to 590 nm, a third dye having a maximum absorption wavelength in the range of 670 nm to 690 nm, and a fourth dye having a maximum absorption wavelength in the range of 770 nm to 790 nm.

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