Display device

Abstract

To provide a touch display device with improved luminance.SOLUTION: A display device comprises a substrate including a flat area and a bending area disposed at one side of the flat area. The flat area includes a first light emission area, and the bending area includes a second light emission area. The first light emission area includes a first light emission layer and a first color filter layer disposed on the first light emission layer, and the second light emission area includes a second light emission layer and a second color filter layer disposed on the second light emission layer. The second color filter layer includes a third sub-color filter having maximum transmittance at a third peak wavelength and a fourth sub-color filter having maximum transmittance at a fourth peak wavelength shorter than the third peak wavelength, and the sub-color filters overlap each other.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a display device.

Background Art

[0002] With the development of the information society, the requirements for display devices for displaying images have become diversified and increased. In recent years, various display devices such as liquid crystal display devices (LCDs, Liquid Crystal Displays), plasma display devices (PDPs, Plasma Display Panels), and organic light-emitting display devices (OLEDs, Organic Light Emitting Displays) have been utilized.

[0003] Among display devices, organic light-emitting display devices are self-luminous, and compared with liquid crystal display devices (LCDs), they are excellent in terms of viewing angle, contrast ratio, etc., do not require a separate backlight, can be made thinner, lighter, shorter, and smaller, and have the advantage of favorable power consumption. In addition, organic light-emitting display devices can be driven by a direct current low voltage, have a fast response speed, and particularly have the advantage of low manufacturing cost.

[0004] An organic light-emitting display device has a structure including an organic light-emitting element including a light-emitting layer between a cathode for injecting electrons and an anode for injecting holes. In an organic light-emitting display device, when electrons generated at the cathode and holes generated at the anode are injected into the inside of the light-emitting layer, the injected electrons and holes combine to generate excitons, and the generated excitons emit light while falling from the excited state to the ground state. It is a display device using this principle.

[0005] In an organic light-emitting display device, the luminance of the light emitted at a certain angle appears lower than that of the light emitted from the front, so there is a problem that the luminance appears different depending on the viewing angle of the screen. Furthermore, recently, various products utilizing displays with curvature on the side have been put on the market. In the case of such a display with curvature, there is a problem that the luminance of the light emitted from the curved side surface is lower than that of the light emitted from the front surface.

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been devised to solve the above-described conventional problems, and includes a first color filter and a second color filter that are provided on any one of the light-emitting layers that emit a first color, overlap each other, and allow light of the first color to pass through. The first color filter and the second color filter are stacked on top of each other so as to allow relatively long wavelengths to pass through while passing through the first color filter and the second color filter, and the second color filter that allows relatively short wavelengths to pass through. By overlapping and laminating them, an object of the present invention is to provide a display device capable of improving the luminance of the light emitted from the side surface and improving the luminance of the light emitted from the bending region having curvature.

Means for Solving the Problems

[0007] To achieve the above object, the present invention includes a substrate, a light-emitting layer provided on the substrate that emits a first color, and a color filter layer provided on the light-emitting layer. The color filter layer includes a first color filter having a maximum transmittance at a first peak wavelength and a second color filter having a maximum transmittance at a second peak wavelength shorter than the first peak wavelength, which overlap each other. A display device is provided.

[0008] The present invention also provides a display device including a substrate having a flat region and a bending region provided on one side of the flat region, the flat region including a first light-emitting region, the bending region including a second light-emitting region, the first light-emitting region including first light emission and a first color filter layer provided on the first light emission, the second light-emitting region including second light emission and a second color filter layer provided on the second light emission, the second color filter layer including a third sub-color filter having a maximum transmittance at a third peak wavelength and a fourth sub-color filter having a maximum transmittance at a fourth peak wavelength shorter than the third peak wavelength, and the third and fourth sub-color filters overlapping each other.

Advantages of the Invention

[0009] According to the present invention as described above, the following effects can be achieved.

[0010] According to an embodiment of the present invention, by providing a first sub-color filter and a second sub-color filter that are formed to overlap each other and transmit light having different peak wavelengths, it is possible to improve the luminance of the light emitted in the side direction of the display device.

[0011] According to an embodiment of the present invention, by configuring the ratio of the thickness of the second sub-color filter to the thickness of the first sub-color filter provided in the flat region and the bending region to be different, it is possible to improve the luminance of the light emitted from the bending region in the front direction.

[0012] According to an embodiment of the present invention, by gradually increasing the ratio of the thickness of the second sub-color filter to the thickness of the first sub-color filter from the inner side direction to the outer side direction of the bending region, it is possible to improve the luminance of the light emitted from the bending region in the front direction.

[0013] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

Brief Description of the Drawings

[0014]

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Figure 10

Mode for Carrying Out the Invention

[0015] The advantages and features of the present invention, and the method for achieving them, will become apparent by referring to various examples described in detail hereinafter based on the accompanying drawings. However, the present invention is not limited to an example disclosed below, and can be embodied in various different forms. Examples such as an example of the present invention are provided only to complete the disclosure of the present invention and to fully inform those with ordinary knowledge in the technical field to which the technical idea of the present invention belongs of the scope of the technical idea. The technical idea of the present invention is only defined by the scope of the claims.

[0016] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and the present invention is not limited to the matters illustrated. The same reference numerals throughout the specification indicate the same components. Also, in the description of the present invention, when it is determined that a specific description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

[0017] When using terms such as "including", "having", "becoming", etc. referred to in the present invention, other parts can be added unless "only" is used. When a component is expressed in the singular, it includes the case of including a plurality unless otherwise explicitly stated.

[0018] In the interpretation of components, even if there is no separate explicit description, it is interpreted as including the error range.

[0019] In the case of an explanation of the positional relationship, for example, when explaining the positional relationship between two parts such as "on ~", "above ~", "below ~", "next to ~", etc., unless "immediately" or "directly" is used, one or more other parts can also be located between the two parts.

[0020] In the case of an explanation of the time relationship, for example, when explaining the temporal precedence relationship such as "after ~", "subsequent to ~", "next to ~", "before ~", etc., unless "immediately" or "directly" is used, it can also include the case where it is not continuous.

[0021] The terms such as "first" and "second" are used to describe various components, but these components are not limited to these terms. These terms are only used to distinguish one component from another. Thus, the first component mentioned below may also be the second component within the technical concept of the present invention.

[0022] The features of each of many embodiments of the present invention can be partially or wholly combined or combined with each other, enabling various technical linkages and drives. Each embodiment can be implemented independently of each other or can be implemented together in an associated relationship.

[0023] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0024] FIG. 1 is a plan view of a display device according to an embodiment of the present invention.

[0025] As can be seen from FIG. 1, a display device according to an embodiment of the present invention includes a flat area FA, a first bending area BA1, and a second bending area BA2.

[0026] The flat area FA corresponds to a portion that is not bent and is formed flat. The flat area FA includes a first light-emitting area E1. The first light-emitting area E1 is composed of a plurality, and a plurality of first light-emitting areas E1 can emit light to display an image.

[0027] The first light-emitting region E1 includes a plurality of first sub-pixels SP1. The plurality of first sub-pixels SP1 provided in the first light-emitting region E1 emit light of red (R), green (G), and blue (B) respectively. On the other hand, in FIG. 1, only the form in which the first light-emitting region E1 is composed of three first sub-pixels SP1 is shown, but it is not limited thereto, and it can also include four first sub-pixels SP1. Here, each of the four first sub-pixels SP1 emits light of red (R), green (G), blue (B), and white (W). Also, without being limited thereto, depending on the technical level in the art, various numbers of first sub-pixels SP1 can emit light of different colors from each other.

[0028] For example, the plurality of sub-pixels SP can include sub-pixels of red (R), green (G), and blue (B). Here, the sub-pixels of red (R), green (G), and blue (B) can be provided repeatedly. Alternatively, the plurality of sub-pixels SP can include sub-pixels of red (R), green (G), blue (B), and white (W). Here, the sub-pixels of red (R), green (G), blue (B), and white (W) can be provided repeatedly. Alternatively, the sub-pixels of red (R), green (G), blue (B), and white (W) can be configured in a Quad type. Alternatively, the sub-pixels of red (R), green (G), and blue (B) can be arranged in order along the column direction. The sub-pixels of red (R), green (G), blue (B), and white (W) can be arranged in order along the column direction. However, in an embodiment of the present invention, the color type, arrangement type, arrangement order, etc. of the sub-pixels are not limited thereto, and can be configured in various ways depending on the light-emitting characteristics of the sub-pixels, the lifespan of the display device, and the specifications of the display device.

[0029] On the other hand, the sub-pixels can have different light-emitting areas depending on their light-emitting characteristics. For example, the sub-pixels that emit a color different from the blue (B) sub-pixel can have a light-emitting area different from that of the blue (B) sub-pixel. For example, the sub-pixels of red (R), green (G), and blue (B) or the sub-pixels of red (R), green (G), blue (B), and white (W) can each have a different light-emitting area.

[0030] The first bending region BA1 can be provided on one side of the flat region FA, for example, the right side. The first bending region BA1 can be a bent portion.

[0031] The first bending region BA1 includes a second light-emitting region E2 provided adjacent to the flat region FA relatively and a third light-emitting region E3 provided in a portion far from the flat region FA relatively. For example, the second light-emitting region E2 can be provided adjacent to the flat region FA compared with the third light-emitting region E3. Thus, the third light-emitting region E3 is provided outside the display device according to an embodiment of the present invention compared with the second light-emitting region E2.

[0032] The second light-emitting region E2 includes a plurality of second sub-pixels SP2, and the third light-emitting region E3 includes a plurality of third sub-pixels SP3. Here, since the description about the plurality of second sub-pixels SP2 and the plurality of third sub-pixels SP3 is the same as that of the plurality of first sub-pixels SP1 described above, the repetitive description is omitted.

[0033] The second bending region BA2 can be provided on the other side of the flat region FA, for example, the left side. The second bending region BA2 can also include a plurality of light-emitting regions, and each of the plurality of light-emitting regions includes a plurality of sub-pixels. Since the specific description about this is the same as that of the first bending region BA1, the repetitive description is omitted.

[0034] FIG. 2 is a schematic perspective view of a display device according to an embodiment of the present invention.

[0035] As can be seen from FIG. 2, the display device according to an embodiment of the present invention includes the flat region FA, the first bending region BA1, and the second bending region BA2 as described above.

[0036] The flat region FA is not bent separately and is maintained in a flat state.

[0037] The first bending region BA1 can be maintained in a bent state at one end of the flat region FA, for example, the right end. Specifically, based on the boundary between the flat region FA and the first bending region BA1, one end of the first bending region BA1, for example, the right end, can be folded to the rear of the display device. Similarly, the second bending region BA2 can be maintained in a bent state at the other end of the flat region FA, for example, the left end. Specifically, based on the boundary between the flat region FA and the second bending region BA2, one end of the second bending region BA2, for example, the left end, can be folded to the rear of the display device. On the other hand, the manner in which the first bending region BA1 and the second bending region BA2 are bent is not limited to this. For example, the first bending region BA1 can be maintained in a bent state at the upper end of the flat region FA. In particular, based on the boundary between the flat region FA and the first bending region BA1, the upper end of the first bending region BA1 can be folded to the rear of the display device. Similarly, the second bending region BA2 can be maintained in a bent state at the lower end of the flat region FA. In particular, based on the boundary between the flat region FA and the second bending region BA2, the lower end of the second bending region BA2 can be folded to the rear of the display device.

[0038] FIG. 3 is a cross-sectional view of a display device according to an embodiment of the present invention.

[0039] As can be seen from FIG. 3, a display device according to an embodiment of the present invention includes a flat region FA, a first bending region BA1, and a second bending region BA2. Here, the angles of the light emitted from the flat region FA, the first bending region BA1, and the second bending region BA2 in the front direction of the display device can be different. Here, the front direction is the direction opposite to the back surface of the display device according to an embodiment of the present invention, and the front direction can be defined as the upper surface in the drawing.

[0040] The angles of the light emitted in the front direction from the flat region FA, the first bending region BA1, and the second bending region BA2 are different, and the angle of the light emitted in the front direction from the inside of the first bending region BA1 and the second bending region BA2 and the angle of the light emitted in the front direction from the outside of the first bending region BA1 and the second bending region BA2 can be different from each other.

[0041] For example, the inside of the first bending region BA1 and the second bending region BA2 can mean a portion adjacent to the flat region FA. And the outside of the first bending region BA1 and the second bending region BA2 can mean a portion far from the flat region FA. For example, the angle of the light emitted from the front of a part of the first bending region BA1 and the second bending region BA2 adjacent to the flat region FA and the angle of the light emitted from the front of the other part of the first bending region BA1 and the second bending region BA2 far from the flat region FA can be different. For example, the angle of the light emitted from the front of a part of the first bending region BA1 and the second bending region BA2 adjacent to the flat region FA may be smaller than the angle of the light emitted from the front of the other part of the first bending region BA1 and the second bending region BA2 far from the flat region FA.

[0042] The light emitted in the front direction from the flat region FA is emitted in the normal direction from the upper surface of the display device according to an embodiment of the present invention, while the light emitted in the front direction from the first bending region BA1 can be emitted at a certain angle with respect to the normal of the upper surface of the display device. For example, the light emitted from the pixels provided inside the first bending region BA1 is emitted in the front direction at a second angle θ2 with respect to the normal of the upper surface of the display device, and the light emitted from the pixels provided outside the first bending region BA1 can be emitted in the front direction at a third angle θ3 with respect to the normal of the upper surface of the display device. Here, the angle formed by the front direction with respect to the normal of the upper surface of the display device increases as it goes to the outside of the first bending region BA1. That is, the second angle θ2 can be formed smaller than the third angle θ3.

[0043] FIG. 4 is a cross-sectional view of a first light-emitting region provided in a display device according to an embodiment of the present invention, and is a cross-sectional view taken along line I-I of FIG. 1.

[0044] As can be seen from FIG. 4, a display device according to an embodiment of the present invention includes a substrate 100, a buffer layer 110, an active layer 120, a gate insulating film 130, a gate electrode 140, an interlayer insulating film 150, a source electrode 161, a drain electrode 162, a planarization layer 170, a bank 190, a first electrode 200, a light-emitting layer 210, a second electrode 220, a sealing layer 230, a black matrix 240, and a first color filter layer CF1.

[0045] The substrate 100 can be made of glass or plastic. In particular, the substrate 100 can be made of a flexible transparent plastic, for example, polyimide. When using polyimide as the substrate 100, considering performing a high-temperature evaporation process on the substrate 100, heat-resistant polyimide that can withstand high temperatures can be used. Alternatively, the substrate 100 can be made of at least a part of polyethylene terephthalate (PET), ABS copolymer, polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polycarbonate (PC), polyethersulfone (PES), polyarylate (PAR), polysulfone (PSF), cyclic olefin copolymer (COC), triacetyl cellulose (TAC), polyvinyl alcohol (PVA), and polystyrene (PS), but is not limited thereto.

[0046] The buffer layer 110 can be formed on the substrate 100. The buffer layer 110 can block air and moisture to protect the active layer 120. The buffer layer 110 can be made of an inorganic insulator such as silicon oxide, silicon nitride, or metal oxide, but is not limited thereto. For example, the buffer layer 110 can also be formed of a single layer or multiple layers of inorganic films. The single-layer inorganic film is, for example, a single layer of silicon oxide (SiOx), a single layer of a thin film, or a single layer of silicon nitride (SiNx) thin film. The multiple-layer inorganic film can be formed by alternately laminating at least one silicon oxide (SiOx) thin film, at least one silicon nitride (SiNx) thin film, and at least one amorphous silicon (a-Si) thin film. However, it is not necessarily limited thereto, and the buffer layer 110 can be made of an organic insulator.

[0047] The active layer 120 can be formed on the buffer layer 110. The active layer 120 can comprise a semiconductor material, such as an oxide semiconductor, an amorphous semiconductor, or a polycrystalline semiconductor.

[0048] The oxide semiconductor material can excellently prevent leakage current and has a relatively low manufacturing cost. The oxide semiconductor material can be composed of zinc (Zn), indium (In), gallium (Ga), tin (Sn), and titanium (Ti) or zinc (Zn), indium (In), gallium (Ga), tin (Sn), or titanium (Ti) and / or a combination of oxides containing these. Specifically, the oxide semiconductor can contain any one of zinc oxide (ZnO), zinc tin oxide (ZTO), zinc indium oxide (ZIO), indium oxide (InO), titanium oxide (TiO), indium-gallium-zinc oxide (IGZO), indium-zinc-tin oxide (IZTO), indium-zinc oxide (IZO), indium-gallium-tin oxide (IGTO), and indium-gallium oxide (IGO), but is not limited thereto.

[0049] A polycrystalline semiconductor material can have a high speed of carrier substances such as electrons and holes and thus a high mobility. And it is advantageous for low-energy power consumption and can have high reliability. The polycrystalline semiconductor material can be made of crystalline silicon (Poly-Si), but is not limited thereto.

[0050] The amorphous semiconductor material can be made of amorphous silicon (a-Si), but is not limited thereto.

[0051] The active layer 120 includes a channel portion 121, a first connection portion 122 provided on one side of the channel portion 121, for example, the left side, and a second connection portion 123 provided on the other side of the channel portion 121, for example, the right side.

[0052] The channel portion 121 overlaps with the gate electrode 140. By being formed in this way, in the conductorization process of making the active layer 120 conductive, the channel portion 121 can be protected by the gate electrode 140 and thus maintain semiconductor characteristics without being conductorized.

[0053] The first connection portion 122 and the second connection portion 123 can have conductive characteristics by a conductorization process of performing plasma treatment on the semiconductor material using, for example, the gate electrode 140 as a mask. The first connection portion 122 and the second connection portion 123 formed by the conductorization process can have excellent conductive characteristics and serve as electrodes or wirings.

[0054] The gate insulating film 130 can be formed on the active layer 120. The gate insulating film 130 can be formed on the entire surface of the substrate 100, but is not limited thereto. A partial region of the gate insulating film 130 can also be patterned so that one end and the other end of the gate insulating film 130 respectively correspond to one end and the other end of the gate electrode 140.

[0055] The gate insulating film 130 can include, but is not limited to, a silicon nitride film (SiNx) or a silicon oxide film (SiOx). The gate insulating film 130 can be composed of a single layer or multiple layers including an inorganic insulator and / or an organic insulator. For example, the gate insulating film 130 can also be formed of a single layer or multiple layers of inorganic films. The single layer of inorganic film is, for example, a single layer of a silicon oxide (SiOx) thin film or a single layer of a silicon nitride (SiNx) thin film, and the multiple layers of inorganic films can be formed, for example, by alternately laminating at least one silicon oxide (SiOx) thin film, at least one silicon nitride (SiNx) thin film, and at least one amorphous silicon (a-Si) thin film, but is not limited thereto. Furthermore, the gate insulating film 130 can be formed by atomic layer deposition (ALD) or metalorganic chemical vapor deposition (MOCVD), but is not limited thereto.

[0056] The gate electrode 140 can be formed on the gate insulating film 130.

[0057] The gate electrode 140 can include at least one of aluminum-based metals such as aluminum (Al) and aluminum alloys, silver-based metals such as silver (Ag) and silver alloys, copper-based metals such as copper (Cu) and copper alloys, molybdenum-based metals such as molybdenum (Mo) and molybdenum alloys, chromium (Cr), tantalum (Ta), neodymium (Nd), and titanium (Ti). The gate electrode 140 can also have a structure including one metal layer or a multilayer structure including at least two metal layers having different physical properties.

[0058] The interlayer insulating film 150 can be formed on the gate electrode 140. The interlayer insulating film 150 insulates between the gate electrode 140 and the source electrode 161, and further insulates between the gate electrode 140 and the drain electrode 162. The interlayer insulating film 150 can be composed of a single layer or multiple layers including an inorganic insulator and / or an organic insulator.

[0059] Contact holes can be formed in the interlayer insulating film 150. Therefore, a part of the upper surface of the first connection portion 122 of the active layer 120 can be exposed by any one of the contact holes, and further, a part of the upper surface of the second connection portion 123 of the active layer 120 can be exposed by another one of the contact holes. For example, the interlayer insulating film 150 can also be formed of a single-layer or multi-layer inorganic film. The single-layer inorganic film is, for example, a single layer of a silicon oxide (SiOx) thin film or a single layer of a silicon nitride (SiNx) thin film, and the multi-layer inorganic film can be formed, for example, by alternately laminating at least one silicon oxide (SiOx) thin film, at least one silicon nitride (SiNx) thin film, and at least one amorphous silicon (a-Si) thin film, but is not limited thereto.

[0060] The source electrode 161 and the drain electrode 162 can be provided on the interlayer insulating film 150.

[0061] The source electrode 161 can be electrically connected to the first connection portion 122 of the active layer 120 through a contact hole, and the drain electrode 162 can be electrically connected to the second connection portion 123 of the active layer 120 through a contact hole.

[0062] The source electrode 161 and the drain electrode 162 can be formed of the same material as the gate electrode 140, but are not limited thereto. The source electrode 161 and the drain electrode 162 can also be formed of a material different from that of the gate electrode 140 and can be formed of a material according to the knowledge in the art.

[0063] The planarization layer 170 can be formed on the interlayer insulating film 150, the source electrode 161, and the drain electrode 162. By forming the planarization layer 170 on the source electrode 161 and the drain electrode 162, the upper surface of the planarization layer 170 can be planarized. The planarization layer 170 can be provided to protect the thin film transistor including the active layer 120, the gate insulating film 130, the gate electrode 140, the interlayer insulating film 150, the source electrode 161, and the drain electrode 162, and to planarize the step formed by the thin film transistor.

[0064] The planarization layer 170 is provided with contact holes, and a part of the upper surface of the drain electrode 162 can be exposed through the contact holes. However, in some cases, a part of the upper surface of the source electrode 161 can also be exposed through the contact holes, but it is not limited thereto.

[0065] The planarization layer 170 can be composed of an organic insulating layer material. The planarization layer 170 can be composed of an organic insulating material such as, for example, acrylic resin, epoxy resin, phenolic resin, polyamide resin, or polyimide resin.

[0066] The organic light-emitting element EL includes a first electrode 200, an organic light-emitting layer 210, and a second electrode 220. The organic light-emitting element EL can emit light of a first color, and the first color can be any one of red (R), green (G), blue (B), and white (W), but it is not limited thereto.

[0067] The first electrode 200 can be formed on the planarization layer 170 and can be electrically connected to the drain electrode 162 through the contact holes provided in the planarization layer 170. The first electrode 200 can function as an anode.

[0068] The bank 190 can be formed on the first electrode 200. Here, a partial region of the upper surface of the first electrode 200 that is not blocked by the bank 190 becomes the light-emitting region.

[0069] The bank 190 can be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0070] The bank 190 can include an opaque substance in order to reduce color mixing by the plurality of sub-pixels SP. For example, the bank 190 can be formed of a black resin, but is not limited thereto.

[0071] Although not specifically shown, spacers can be formed on the bank 190. The spacers can secure a gap between the fine metal mask (FMM) and the first electrode 200. Thus, in the deposition process of the light-emitting layer 210, the fine metal mask (FMM) can be prevented from contacting the first electrode 200.

[0072] The light-emitting layer 210 can be formed on the first electrode 200. The light-emitting layer 210 can include red, green, and blue light-emitting layers patterned by pixel, or can be a white light-emitting layer connected by all pixels. When the light-emitting layer 210 is a white light-emitting layer, the light-emitting layer 210 can include, for example, a first stack including a blue light-emitting layer, a second stack including, for example, a yellow-green light-emitting layer, and a charge generation layer provided between the first stack and the second stack, but is not necessarily limited thereto. For example, the light-emitting layer 210 can include at least one hole injection layer (HIL), hole transport layer (HTL), electron transport layer (ETL), and electron injection layer (EIL), but is not limited thereto.

[0073] The second electrode 220 can be formed on the light-emitting layer 210. The second electrode 220 can function as a cathode.

[0074] The second electrode 220 can be formed, for example, on the entire surfaces of the bank 190 and the light-emitting layer 210.

[0075] Depending on the bottom-emission or top-emission mode of the display device, either one of the first electrode 200 and the second electrode 220 can be formed of a single layer or multiple layers including an opaque conductive material having a relatively high reflection efficiency. On the other hand, the other of the first electrode 200 and the second electrode 220 can include a transparent material, but is not limited thereto.

[0076] For example, the opaque conductive material can include, but is not limited to, aluminum (Al), silver (Ag), copper (Cu), lead (Pb), molybdenum (Mo), titanium (Ti), and alloys thereof having a relatively low work function.

[0077] The encapsulation layer 230 can include a first encapsulation layer 230a, a second encapsulation layer 230b, and a third encapsulation layer 230c. The first encapsulation layer 230a to the third encapsulation layer 230c can be sequentially stacked on the second electrode 220. The first encapsulation layer 230a and the third encapsulation layer 230c can be formed of inorganic film layers including inorganic substances, and the second encapsulation layer 230b can be formed of an organic film layer including organic substances. The first encapsulation layer 230a is formed at the lowermost end of the encapsulation layer 230 and can be in contact with the upper surface of the second electrode 220. The first encapsulation layer 230a can be formed of a material such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al2O3).

[0078] The second encapsulation layer 230b can be formed on the first encapsulation layer 230a. The second encapsulation layer 230b can be formed of a material such as acrylic resin, epoxy resin, polyimide, polyethylene (PE), or silicon oxycarbide (SiOC).

[0079] The third encapsulation layer 230c can be formed on the second encapsulation layer 230b. The third encapsulation layer 230c can be formed of the same material as the first encapsulation layer 230a. However, it is not limited thereto, and the third encapsulation layer 230c can also include a substance different from the first encapsulation layer 230a.

[0080] On the other hand, the encapsulation layer 230 is not limited to a triple film, and n films (where n is an integer greater than 3) can also be alternately laminated between the inorganic encapsulation layer and the organic encapsulation layer.

[0081] The black matrix 240 can be formed on the encapsulation layer 230. Specifically, by forming the black matrix 240 so as to overlap with the bank 190, it is possible to block the light emitted from the organic light-emitting element EL from flowing into other adjacent sub-pixels. Therefore, it is possible to prevent the problem of color mixing of different lights generated in adjacent sub-pixels.

[0082] The first color filter layer CF1 can be formed on the encapsulation layer 230 and the black matrix 240. The first color filter layer CF1 can allow the light emitted from the organic light-emitting element EL provided in the first sub-pixel SP1 to pass through. Therefore, it is possible to allow the light of the first color emitted by the organic light-emitting element EL to pass through. For example, when the light of the first color is green (G), the first color filter layer CF1 can allow the green (G) light to pass through, but it is not limited thereto. For example, when the light of the first color is blue (B), the first color filter layer CF1 can allow the blue (B) light to pass through, and for example, when the light of the first color is red (R), the first color filter layer CF1 can allow the red (R) light to pass through.

[0083] According to an embodiment of the present invention, the first color filter layer CF1 can include a first sub-color filter SF1 and a second sub-color filter SF2.

[0084] The first sub-color filter SF1 and the second sub-color filter SF2 can overlap each other. Here, the first sub-color filter SF1 can be provided on the encapsulation layer 230, and the second sub-color filter SF2 can be provided on the first sub-color filter SF1. On the other hand, without being limited thereto, the second sub-color filter SF2 can be provided on the encapsulation layer 230, and the first sub-color filter SF1 can also be provided on the second sub-color filter SF2.

[0085] By being formed in this way, the light emitted from the organic light-emitting element EL passes through the first sub-color filter SF1 and the second sub-color filter SF2 and then goes outwards.

[0086] The first sub-color filter SF1 and the second sub-color filter SF2 transmit light in different wavelength ranges. For example, the first sub-color filter SF1 can transmit light in the wavelength range of 500 nm to 650 nm, and the second sub-color filter SF2 can transmit light in the wavelength range of 400 nm to 580 nm.

[0087] The first sub-color filter SF1 can have a maximum transmittance at a wavelength different from that of the second sub-color filter SF2. Specifically, the first sub-color filter SF1 can have a maximum transmittance at a first wavelength, and the second sub-color filter SF2 can have a maximum transmittance at a second wavelength. Here, the first wavelength of the first sub-color filter SF1 may be larger than the second wavelength of the second sub-color filter SF2, and the maximum transmittance at the second wavelength of the second sub-color filter SF2 may be larger than the maximum transmittance at the first wavelength of the first sub-color filter SF1, but it is not limited thereto.

[0088] According to an embodiment of the present invention, the first sub-color filter SF1 and the second sub-color filter SF2 overlap each other, and the light emitted from the organic light-emitting element EL passes through the first sub-color filter SF1 and the second sub-color filter SF2 and is emitted to the outside, thereby improving the luminance of the light emitted at the first angle θ1.

[0089] On the other hand, the principle of the increase in the luminance of the light passing through the first sub-color filter SF1 and the second sub-color filter SF2 at the first angle θ1 will be described more specifically with reference to FIGS. 5 and 6 below.

[0090] Here, FIG. 5 is a graph showing the luminance by wavelength according to the viewing angle of the light emitted from the organic light-emitting element EL, and FIG. 6 is a graph showing the wavelength ranges transmitted by the first sub-color filter SF1 and the second sub-color filter SF2, respectively, and the light transmittance according to each wavelength range. Here, the viewing angle can be defined as the angle at which light is emitted with respect to the normal to the upper surface of the organic light-emitting element EL. For example, the light emitted from the front has a viewing angle of 0°, and the light emitted at the first angle θ1 can have a viewing angle of the first angle θ1.

[0091] First, as can be seen from FIG. 5, when the organic light-emitting element (see EL in FIG. 4) provided in the first sub-pixel SP1 emits, for example, green (G), it can emit light having a wavelength of approximately 490 nm to 570 nm. Here, it can be confirmed that the luminance by wavelength relatively decreases as the viewing angle increases. For example, it can be confirmed that when the viewing angle is 0°, the luminance at the peak wavelength λmax is 100%, whereas when the viewing angle is 40°, the luminance at the peak wavelength λmax is about 32%. Here, the luminance for each viewing angle is measured relatively assuming that the luminance measured when the viewing angle is 0° is 100%.

[0092] Furthermore, as the viewing angle increases, the graph of luminance by wavelength tends to shift to the left as a whole. For example, it can be confirmed that the graph is relatively biased to the left when the viewing angle is 40° compared to when the viewing angle is 0°. Therefore, when the viewing angle is 0°, it can be confirmed that the graph is relatively symmetric based on the peak wavelength λmax, but when the viewing angle is 40°, it can be confirmed that the graph is relatively biased to the left based on the peak wavelength λmax. For example, when the viewing angle is 40°, the peak wavelength λmax tends to shift to the left compared to when the viewing angle is 0°.

[0093] Also, it can be confirmed that the peak wavelength λmax according to the viewing angle tends to become shorter while moving in the left direction as the viewing angle increases. That is, it can be confirmed that when the viewing angle is 40°, the peak wavelength λmax becomes shorter while moving in the left direction compared to when the viewing angle is 0°.

[0094] Next, as can be seen from FIG. 6, the second sub-color filter SF2 can transmit light in a relatively short wavelength band compared to the first sub-color filter SF1. For example, when the organic light-emitting element (see EL in FIG. 4) emits green (G), the first sub-color filter SF1 can transmit light in the wavelength range of, for example, 500 nm to 650 nm, and the second sub-color filter SF2 can transmit light in the wavelength range of, for example, 400 nm to 580 nm.

[0095] Furthermore, the first sub-color filter SF1 can have a maximum transmittance at the first wavelength λ1, and the second sub-color filter SF2 can have a maximum transmittance at the second wavelength λ2. Here, the first wavelength λ1 is the peak wavelength of the light transmitted by the first sub-color filter SF1, and the second wavelength λ2 can be the peak wavelength of the light transmitted by the second sub-color filter SF2. According to an embodiment of the present invention, the length of the first wavelength λ1 and the length of the second wavelength λ2 can be within a range of 50 nm from the length of the peak wavelength λmax of the light emitted by the organic light-emitting element (see EL in FIG. 4). For example, the length of the first wavelength λ1 is greater than the length of the peak wavelength λmax of the light emitted by the organic light-emitting element (see EL in FIG. 4) and within a range of 50 nm from the length of the peak wavelength λmax of the light, and the length of the second wavelength λ2 is smaller than the length of the peak wavelength λmax of the light emitted by the organic light-emitting element (see EL in FIG. 4) and can be within a range of 50 nm from the length of the peak wavelength λmax of the light. On the other hand, in FIG. 6, only the case where the peak wavelength λmax of the light emitted by the organic light-emitting element (see EL in FIG. 4) is between the first wavelength λ1 and the second wavelength λ2 is shown, but it is not limited thereto. For example, the length of the peak wavelength λmax of the light emitted by the organic light-emitting element (see EL in FIG. 4) can be 520 nm or more and 530 nm or less, the length of the second wavelength λ2 can be greater than 470 nm, and the length of the first wavelength λ1 can be smaller than 580 nm, but it is not limited thereto.

[0096] According to an embodiment of the present invention, it can be formed such that the maximum transmittance at the second wavelength λ2 is higher than the maximum transmittance at the first wavelength λ1. On the other hand, the luminance of the light seen in the actual display device is proportional to the product of the luminance of the light emitted from the organic light-emitting element and the transmittance of the color filter layer. Therefore, since the transmittance of the second sub-color filter SF2 having the maximum transmittance at the second wavelength λ2 is higher than the transmittance of the first sub-color filter SF1 having the maximum transmittance at the first wavelength λ1, the luminance of the light traveling at the first angle θ1 can be improved. Eventually, according to an embodiment of the present invention, the luminance of the light visually recognized on the side surface of the flat region (see FA in FIG. 3) of the display device, for example, the light traveling at the first angle θ1 can be improved.

[0097] Referring to FIG. 4, the first sub-color filter SF1 may have a first thickness t1, and the second sub-color filter SF2 may have a second thickness t2. Here, the first thickness t1 is the shortest distance between the lower surface and the upper surface of the first sub-color filter SF1, and the second thickness t2 may be the shortest distance between the lower surface and the upper surface of the second sub-color filter SF2. According to an embodiment of the present invention, by adjusting the ratio of the first thickness t1 of the first sub-color filter SF1 and the second thickness t2 of the second sub-color filter SF2, it can be optimized so that the luminance of the light emitted at the first angle θ1 is improved. On the other hand, in relation to this, it will be described more specifically based on FIGS. 7 and 10 below.

[0098] FIG. 7 is a cross-sectional view of a first light-emitting region and a second light-emitting region provided in a display device according to another embodiment of the present invention. Here, FIG. 7 is a cross-sectional view taken along line I-I and line II-II of FIG. 1. On the other hand, in the embodiment of FIG. 7, since the first sub-pixel is the same as the first sub-pixel of FIG. 4, and the second sub-pixel is the same as the second sub-pixel of FIG. 4 except for the configuration of the third sub-color filter and the fourth sub-color filter, the different configurations will be mainly described below.

[0099] As can be seen from FIG. 7, a display device according to an embodiment of the present invention includes a substrate 100, a buffer layer 110, an active layer 120, a gate insulating film 130, a gate electrode 140, an interlayer insulating film 150, a source electrode 161, a drain electrode 162, a planarization layer 170, a bank 190, a first electrode 200, a light-emitting layer 210, a second electrode 220, a sealing layer 230, a black matrix 240, a first color filter layer CF1 provided in the first sub-pixel SP1, and a second color filter layer CF2 provided in the second sub-pixel SP2.

[0100] According to an embodiment of the present invention, the second sub-pixel SP2 corresponds to any one of the sub-pixels provided in the first bending region (see BA1 in FIG. 3) as described in FIG. 3. The second sub-pixel SP2 is provided in the first bending region (see BA1 in FIG. 3) having a curvature. Therefore, the light emitted from the organic light-emitting element EL provided in the second sub-pixel SP2 toward the front of the display device according to an embodiment of the present invention is emitted at a second angle θ2 with respect to the normal of the upper surface of the organic light-emitting element EL.

[0101] The second sub-pixel SP2, unlike the first sub-pixel SP1, includes a second color filter layer CF2.

[0102] The second color filter layer CF2 can be formed on the encapsulation layer 230 and the black matrix 240. The second color filter layer CF2 can allow the light emitted from the organic light-emitting element EL provided in the second sub-pixel SP2 to pass through. Therefore, the light of the first color emitted by the organic light-emitting element EL can pass through. For example, when the light of the first color is green (G), the second color filter layer CF2 can allow the green (G) light to pass through, but is not limited thereto. For example, when the light of the first color is blue (B), the second color filter layer CF2 can allow the blue (B) light to pass through, and for example, when the light of the first color is red (R), the second color filter layer CF2 can allow the red (R) light to pass through.

[0103] According to an embodiment of the present invention, the second color filter layer CF2 can include a third sub-color filter SF3 and a fourth sub-color filter SF4.

[0104] The third sub-color filter SF3 and the fourth sub-color filter SF4 can overlap each other. Here, the third sub-color filter SF3 is provided on the encapsulation layer 230, and the fourth sub-color filter SF4 can be provided on the third sub-color filter SF3. On the other hand, without being limited thereto, the fourth sub-color filter SF4 can be provided on the encapsulation layer 230, and the third sub-color filter SF3 can be provided on the fourth sub-color filter SF4.

[0105] On the other hand, when the second sub-color filter SF2 is formed on the first sub-color filter SF1 in the first sub-pixel SP1 and the fourth sub-color filter SF4 is formed on the third sub-color filter SF3 in the second sub-pixel SP2, the third sub-color filter SF3 can be formed in the process of forming the first sub-color filter SF1, and the fourth sub-color filter SF4 can be formed in the process of forming the second sub-color filter SF2, so the manufacturing time and manufacturing cost can be reduced. However, without being limited thereto, when the first sub-color filter SF1 is formed on the second sub-color filter SF2 in the first sub-pixel SP1 and the third sub-color filter SF3 is formed on the fourth sub-color filter SF4 in the second sub-pixel SP2, similarly, the manufacturing time and manufacturing cost can be reduced.

[0106] The light emitted from the organic light-emitting element EL passes through the third sub-color filter SF3 and the fourth sub-color filter SF4 at the same time and then goes outwards.

[0107] The third sub-color filter SF3 and the fourth sub-color filter SF4 transmit light in different wavelength ranges. For example, the third sub-color filter SF3 can transmit light in the wavelength range of 500 nm to 650 nm, and the fourth sub-color filter SF4 can transmit light in the wavelength range of 400 nm to 580 nm. On the other hand, the third sub-color filter SF3 is the same as the first sub-color filter SF1 except for the thickness, and the fourth sub-color filter SF4 is the same as the second sub-color filter SF2 except for the thickness, so repeated descriptions are omitted.

[0108] The third sub-color filter SF3 can have a maximum transmittance at a wavelength different from that of the fourth sub-color filter SF4. Specifically, the third sub-color filter SF3 can have a maximum transmittance at the third wavelength, and the fourth sub-color filter SF4 can have a maximum transmittance at the fourth wavelength. Here, the third wavelength of the third sub-color filter SF3 may be larger than the fourth wavelength of the fourth sub-color filter SF4, and the maximum transmittance at the fourth wavelength of the fourth sub-color filter SF4 may be larger than the maximum transmittance at the third wavelength of the third sub-color filter SF3.

[0109] According to an embodiment of the present invention, the third sub-color filter SF3 and the fourth sub-color filter SF4 overlap each other, and the light emitted from the organic light-emitting element EL passes through the third sub-color filter SF3 and the fourth sub-color filter SF4 and is emitted to the outside, thereby improving the luminance of the light viewed at the viewing angle of the second angle θ2.

[0110] The third sub-color filter SF3 can have a third thickness t3, and the fourth sub-color filter SF4 can have a fourth thickness t4. Here, the third thickness t3 is the shortest distance between the lower surface and the upper surface of the third sub-color filter SF3, and the fourth thickness t4 can be the shortest distance between the lower surface and the upper surface of the fourth sub-color filter SF4. According to an embodiment of the present invention, by adjusting the ratio of the third thickness t3 of the third sub-color filter SF3 and the fourth thickness t4 of the fourth sub-color filter SF4, it can be optimized to improve the luminance of the light emitted at the second angle θ2.

[0111] According to an embodiment of the present invention, the first color filter layer CF1 provided in the first sub-pixel SP1 and the second color filter layer CF2 provided in the second sub-pixel SP2 can be laminated with different thickness ratios. Specifically, the ratio of the thickness of the second sub-color filter SF2 to the thickness of the first sub-color filter SF1 provided in the first color filter layer CF1 and the ratio of the thickness of the fourth sub-color filter SF4 to the thickness of the third sub-color filter SF3 provided in the second color filter layer CF2 can be different from each other.

[0112] According to an embodiment of the present invention, the ratio of the thickness of the second sub-color filter SF2 to the thickness of the first sub-color filter SF1 may be smaller than the ratio of the thickness of the fourth sub-color filter SF4 to the thickness of the third sub-color filter SF3. Eventually, the ratio of the third sub-color filter SF3 that allows light of a relatively shorter wavelength to pass through in the second sub-pixel SP2 may be higher than that in the first sub-pixel SP1.

[0113] By being formed in this way, the light emitted from the organic light-emitting element EL of the second sub-pixel SP2 can better pass through light of a relatively shorter wavelength, thereby improving the luminance of the light emitted at the second angle θ2.

[0114] On the other hand, in FIG. 7, only the form in which the first sub-pixel SP1 includes the first sub-color filter SF1 and the second sub-color filter SF2, and the second sub-pixel SP2 includes the third sub-color filter SF3 and the fourth sub-color filter SF4 is shown, but the present invention is not limited thereto. The first sub-pixel SP1 may consist of only one layer of the first sub-color filter SF1, and only the second sub-pixel SP2 may include the third sub-color filter SF3 and the fourth sub-color filter SF4. Alternatively, the first sub-pixel SP1 may include the first sub-color filter SF1 and the second sub-color filter SF2, and the second sub-pixel SP2 may consist of only one layer of the third sub-color filter SF3. Even in such a case, the luminance of light directed from the first bending region (see BA1 in FIG. 3) or the second bending region (see BA2 in FIG. 3) toward the front surface of the display device can be improved.

[0115] FIG. 8 is a graph of luminance according to the viewing angle of the first light-emitting region and the second light-emitting region provided in a display device according to another embodiment of the present invention. Here, a represents any one pixel of the display device according to the comparative example, b represents the first sub-pixel SP1 according to the embodiment of FIG. 7, and c represents the second sub-pixel SP2 according to the embodiment of FIG. 7. On the other hand, any one pixel provided in the display device according to the comparative example does not include a sub-color filter that transmits relatively short-wavelength light.

[0116] As can be seen from a, b, and c, compared with the case of the comparative example that does not transmit light in a relatively short wavelength band, b and c transmit light in a relatively short wavelength band, so it can be confirmed that the luminance according to the viewing angle is relatively higher than that of a.

[0117] Furthermore, as can be seen from b and c, by forming the ratio of the thickness of the fourth sub-color filter SF4 to the thickness of the third sub-color filter SF3 to be larger than the ratio of the thickness of the second sub-color filter SF2 to the thickness of the first sub-color filter SF1, more light in a relatively short wavelength band can be transmitted in the case of c, and relatively higher luminance than b can be ensured even at a larger viewing angle.

[0118] FIG. 9 is a cross-sectional view of a second light-emitting region and a third light-emitting region provided in a display device according to still another embodiment of the present invention. Here, FIG. 9 is a cross-sectional view taken along lines II-II and III-III of FIG. 1. On the other hand, in the embodiment of FIG. 9, the second sub-pixel is the same as the second sub-pixel of FIG. 7, and the third sub-pixel is the same as the second sub-pixel of FIG. 7 except for the configurations of the fifth sub-color filter and the sixth sub-color filter. Therefore, the different configurations will be mainly described below.

[0119] As can be seen from FIG. 9, a display device according to an embodiment of the present invention includes a substrate 100, a buffer layer 110, an active layer 120, a gate insulating film 130, a gate electrode 140, an interlayer insulating film 150, a source electrode 161, a drain electrode 162, a planarization layer 170, a bank 190, a first electrode 200, a light-emitting layer 210, a second electrode 220, a sealing layer 230, a black matrix 240, a second color filter layer CF2 provided in the second sub-pixel SP2, and a third color filter layer CF3 provided in the third sub-pixel SP3.

[0120] According to an embodiment of the present invention, the third sub-pixel SP3 corresponds to any one of the sub-pixels provided in the first bending region (see BA1 in FIG. 3) as described in FIG. 3. The third sub-pixel SP3 is provided outside the display device compared to the first bending region (see BA1 in FIG. 3) compared to the second sub-pixel SP2. For example, the third sub-pixel SP3 can be provided farther from the flat region of the display device compared to the second sub-pixel SP2. Therefore, the light emitted from the organic light-emitting element EL provided in the third sub-pixel SP3 toward the front of the display device according to an embodiment of the present invention exits at a third angle θ3 with respect to the normal of the upper surface of the organic light-emitting element EL. Here, the third angle θ3 is larger than the second angle θ2 formed by the light from the second sub-pixel SP2 toward the front of the display device.

[0121] The third sub-pixel SP3 includes a third color filter layer CF3, which is different from the second sub-pixel SP2.

[0122] The third color filter layer CF3 can be formed on the encapsulation layer 230 and the black matrix 240. The third color filter layer CF3 can allow the light emitted from the organic light-emitting element EL provided in the third sub-pixel SP3 to pass through. Thus, the light of the first color emitted by the organic light-emitting element EL can pass through. For example, when the light of the first color is green (G), the third color filter layer CF3 can allow the light of green (G) to pass through, but it is not limited thereto. For example, when the light of the first color is blue (B), the third color filter layer CF3 can allow the light of blue (B) to pass through, and for example, when the light of the first color is red (R), the third color filter layer CF3 can allow the light of red (R) to pass through.

[0123] According to an embodiment of the present invention, the third color filter layer CF3 can include a fifth sub-color filter SF5 and a sixth sub-color filter SF6.

[0124] The fifth sub-color filter SF5 and the sixth sub-color filter SF6 can overlap each other. Here, the fifth sub-color filter SF5 can be provided on the encapsulation layer 230, and the sixth sub-color filter SF6 can be provided on the fifth sub-color filter SF5. On the other hand, it is not limited thereto, and the sixth sub-color filter SF6 can be provided on the encapsulation layer 230, and the fifth sub-color filter SF5 can also be provided on the sixth sub-color filter SF6.

[0125] By being formed in this way, after the light emitted from the organic light-emitting element EL passes through the fifth sub-color filter SF5 and the sixth sub-color filter SF6, it becomes directed outward.

[0126] The fifth sub-color filter SF5 and the sixth sub-color filter SF6 transmit light in different wavelength ranges. For example, the fifth sub-color filter SF5 can transmit light in the wavelength range of 500 nm to 650 nm, and the sixth sub-color filter SF6 can transmit light in the wavelength range of 400 nm to 580 nm. On the other hand, since the fifth sub-color filter SF5 is identical to the first sub-color filter SF1 except for the thickness, and the fourth sub-color filter SF4 is identical to the second sub-color filter SF2 except for the thickness, repeated descriptions will be omitted.

[0127] The fifth sub-color filter SF5 can have a maximum transmittance at a wavelength different from that of the sixth sub-color filter SF6. Specifically, the fifth sub-color filter SF5 can have a maximum transmittance at the fifth wavelength, and the sixth sub-color filter SF6 can have a maximum transmittance at the sixth wavelength. Here, the fifth wavelength of the fifth sub-color filter SF5 may be greater than the sixth wavelength of the sixth sub-color filter SF6, and the maximum transmittance at the sixth wavelength of the sixth sub-color filter SF6 may also be greater than the maximum transmittance at the fifth wavelength of the fifth sub-color filter SF5.

[0128] According to an embodiment of the present invention, when the fifth sub-color filter SF5 and the sixth sub-color filter SF6 overlap each other and the light emitted from the organic light-emitting element EL passes through the fifth sub-color filter SF5 and the sixth sub-color filter SF6 and is emitted to the outside, the luminance of the light viewed at the viewing angle of the third angle θ3 can be improved.

[0129] The fifth sub-color filter SF5 can have a fifth thickness t5, and the sixth sub-color filter SF6 can have a sixth thickness t6. Here, the fifth thickness t5 is the shortest distance between the lower surface and the upper surface of the fifth sub-color filter SF5, and the sixth thickness t6 can be the shortest distance between the lower surface and the upper surface of the sixth sub-color filter SF6. According to an embodiment of the present invention, by adjusting the ratio of the fifth thickness t5 of the fifth sub-color filter SF5 and the sixth thickness t6 of the sixth sub-color filter SF6, it can be optimized to improve the luminance of the light emitted at the third angle θ3.

[0130] According to an embodiment of the present invention, the second color filter layer CF2 provided in the second sub-pixel SP2 and the third color filter layer CF3 provided in the third sub-pixel SP3 can be laminated with different thickness ratios. Specifically, the ratio of the thickness of the fourth sub-color filter SF4 to the thickness of the third sub-color filter SF3 provided in the second color filter layer CF2 and the ratio of the thickness of the sixth sub-color filter SF6 to the thickness of the fifth sub-color filter SF5 provided in the third color filter layer CF3 can be different from each other.

[0131] According to an embodiment of the present invention, the ratio of the thickness of the fourth sub-color filter SF4 to the thickness of the third sub-color filter SF3 may be smaller than the ratio of the thickness of the sixth sub-color filter SF6 to the thickness of the fifth sub-color filter SF5. Eventually, the ratio of the fifth sub-color filter SF5 that allows light with a relatively short wavelength to pass through in the third sub-pixel SP3 may be higher than that in the second sub-pixel SP2.

[0132] By being formed in this way, the light emitted from the organic light-emitting element EL of the third sub-pixel SP3 can better pass through light with a relatively short wavelength, and the luminance of the light emitted at the third angle θ3 can be improved.

[0133] On the other hand, in FIG. 9, although not specifically shown for the first sub-pixel SP1 provided in the flat region FA, in other examples, the first sub-pixel SP1 provided in the flat region FA may, as shown in FIG. 4, also include the first sub-color filter SF1 and the second sub-color filter SF2. Further, in still other examples, the first sub-pixel SP1 may also consist of only one layer of the first sub-color filter SF1, but is not limited thereto.

[0134] FIG. 10 is a graph showing the transmittance of the color filter of the display device according to still another embodiment of the present invention.

[0135] Table 1 below shows the measurement of the luminance of the light emitted at 40° by adjusting the thickness ratio of the first sub-color filter SF1 and the second sub-color filter SF2 in Comparative Example and Examples 1 to 3. Here, the comparative example is equipped with only the first sub-color filter SF1 that transmits light in the wavelength range of 500 nm to 650 nm, and Examples 1 to 3 are equipped with a first sub-color filter SF1 that transmits light in the wavelength range of 500 nm to 650 nm and a second sub-color filter SF2 that transmits light in the wavelength range of 400 nm to 580 nm, with the thickness ratio adjusted to be different from each other.

[0136]

Table 1

[0137] Referring to FIG. 10 and Table 1 together, first, when comparing the comparative example and Examples 1 to 3, it can be seen that when both the first sub-color filter SF1 and the second sub-color filter SF2 are provided, for example, when the ratio of the thickness of the first sub-color filter SF1 to the thickness of the second sub-color filter SF2 is 1:1 to 1:9, it can be confirmed that the luminance increases in Examples 1 to 3 compared to the comparative example equipped with only the first sub-color filter SF1.

[0138] Furthermore, looking at Examples 1 to 3, it can be confirmed that as the ratio of the thickness of the second sub-color filter SF2 to the thickness of the first sub-color filter SF1 increases, the degree to which light in the wavelength range of 400 nm to 580 nm is transmitted relatively increases. As a result, it can be confirmed that the luminance measured at 40° has a higher value as the ratio of the thickness of the second sub-color filter SF2 to the thickness of the first sub-color filter SF1 increases.

[0139] The embodiments of the present invention have been described in more detail based on the accompanying drawings above. However, the present invention is not necessarily limited to such embodiments, and various modifications can be made without departing from the technical idea of the present invention. Therefore, the embodiments disclosed in the present invention are for the purpose of explanation rather than for limiting the technical idea of the present invention, and the scope of the technical idea of the present invention is not limited by such embodiments. Therefore, it must be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention must be interpreted by the scope of the claims, and all technical ideas within the equivalent scope must be interpreted as being included in the scope of rights of the present invention.

Explanation of Reference Numerals

[0140] 100 Substrate 110 Buffer Layer 120 Active Layer 130 Gate Insulating Film 140 Gate Electrode 150 Interlayer Insulating Film 170 Planarization Layer 190 Bank 230 Encapsulation Layer 240 Black Matrix EL Organic Light-Emitting Element E1, E2, E3 First to Third Light-Emitting Regions SP1, SP2, SP3 First to Third Sub-Pixels CF1, CF2, CF3 First to Third Color Filter Layers SF1, SF2, SF3, SF4, SF5, SF6 First to Sixth Sub-Color Filters

Claims

1. A substrate; a light-emitting layer provided on the substrate and emitting a first color light; a color filter layer provided on the light-emitting layer; The display device, wherein the color filter layers overlap each other and include a first sub-color filter having a maximum transmittance at a first peak wavelength, and a second sub-color filter having a maximum transmittance at a second peak wavelength shorter than the first peak wavelength.

2. The display device according to claim 1 , wherein the color filter layer is provided on a flat area of ​​the substrate.

3. The display device according to claim 1 , wherein the color filter layer is provided in a bending region of the substrate.

4. The display device according to claim 1 , wherein a maximum transmittance of the second sub-color filter is greater than a transmittance of the first sub-color filter.

5. the second sub-color filter has a second thickness, and the first sub-color filter has a first thickness; The display device of claim 1 , wherein a ratio of the second thickness to the first thickness is 1 or greater.

6. the second sub-color filter has a second thickness, and the first sub-color filter has a first thickness; The display device of claim 1 , wherein a ratio of the first thickness to the second thickness is in the range of 1:1 to 1:

9.

7. The display device of claim 1 , wherein the first sub-color filter and the second sub-color filter transmit light of the first color.

8. the first peak wavelength of the first sub-color filter is greater than the peak wavelength of the light-emitting layer; The display device of claim 1 , wherein a difference between the first peak wavelength and the peak wavelength is within a range of 50 nm.

9. the second peak wavelength of the second sub-color filter is smaller than the peak wavelength of the light-emitting layer; The display device of claim 1 , wherein a difference between the second peak wavelength and the peak wavelength is within a range of 50 nm.

10. The display device according to claim 1 , wherein the light emitting layer emits light of any one of red, green and blue colors.

11. a substrate including a flat region and a bending region provided on one side of the flat region; a first light-emitting region in the flat region and a second light-emitting region in the bending region; the first light-emitting region includes a first light-emitting layer and a first color filter layer provided on the first light-emitting layer, and the second light-emitting region includes a second light-emitting layer and a second color filter layer provided on the second light-emitting layer; The display device, wherein the second color filter layer overlaps with each other and includes a third sub-color filter having a maximum transmittance at a third peak wavelength, and a fourth sub-color filter having a maximum transmittance at a fourth peak wavelength shorter than the third peak wavelength.

12. the first color filter layer is made of one layer, The display device according to claim 11 , wherein the second color filter layer is made up of two layers, the third sub-color filter and the fourth sub-color filter.

13. the third sub-color filter has a third thickness; the fourth sub-color filter has a fourth thickness; The display device of claim 12 , wherein a ratio of the fourth thickness to the third thickness is 1 or greater.

14. the third sub-color filter has a third thickness; the fourth sub-color filter has a fourth thickness; The display device of claim 12, wherein a ratio of the fourth thickness to the third thickness is in the range of 1:1 to 1:

9.

15. the third peak wavelength of the third sub-color filter is greater than the peak wavelength of the second light-emitting layer, The display device of claim 12 , wherein a difference between the third peak wavelength and the peak wavelength is within a range of 50 nm.

16. the fourth peak wavelength of the fourth sub-color filter is smaller than the peak wavelength of the second light-emitting layer, The display device of claim 12 , wherein a difference between the fourth peak wavelength and the peak wavelength is within a range of 50 nm.

17. The display device of claim 11 , wherein the first color filter layer includes a first sub-color filter overlapping with each other and having a maximum transmittance at a first peak wavelength, and a second sub-color filter having a maximum transmittance at a second peak wavelength.

18. the first sub-color filter is provided under the second sub-color filter, The display device according to claim 17 , wherein the third sub-color filter is provided below the fourth sub-color filter.

19. the first sub-color filter, the second sub-color filter, the third sub-color filter, or the fourth sub-color filter has a first thickness, a second thickness, a third thickness, or a fourth thickness, 18. The display device of claim 17, wherein a ratio of the second thickness of the second sub-color filter to the first thickness of the first sub-color filter is smaller than a ratio of the fourth thickness of the fourth sub-color filter to the third thickness of the third sub-color filter.

20. a maximum transmittance of the second sub-color filter is greater than a transmittance of the first sub-color filter, The display device according to claim 17 , wherein the fourth sub-color filter has a transmittance greater than a transmittance of the third sub-color filter.

21. The third light emitting region is provided in the bending region and is provided on an outer side of the second light emitting region, the third light-emitting region includes a third light-emitting layer and a third color filter layer provided on the third light-emitting layer; 18. The display device of claim 17, wherein the third color filter layer includes a fifth sub-color filter having a maximum transmittance at a fifth peak wavelength and a sixth sub-color filter having a maximum transmittance at a sixth peak wavelength, the fifth sub-color filter being overlapped with each other.

22. the third sub-color filter to the sixth sub-color filter each have a third thickness, a fourth thickness, a fifth thickness, or a sixth thickness; 22. The display device of claim 21, wherein a ratio of the fourth thickness of the fourth sub-color filter to the third thickness of the third sub-color filter is smaller than a ratio of the sixth thickness of the sixth sub-color filter to the fifth thickness of the fifth sub-color filter.

23. the transmittance of the fourth sub-color filter is greater than the transmittance of the third sub-color filter, The display device according to claim 22 , wherein the sixth sub-color filter has a transmittance greater than a transmittance of the fifth sub-color filter.

24. The third light emitting region is provided in the bending region and is provided on an outer side of the second light emitting region, the third light-emitting region includes a third light-emitting layer and a third color filter layer provided on the third light-emitting layer; The display device of claim 11 , wherein the third color filter layer includes a fifth sub-color filter having a maximum transmittance at a fifth peak wavelength and a sixth sub-color filter having a maximum transmittance at a sixth peak wavelength, the fifth sub-color filter being overlapped with each other.

25. the third sub-color filter, the fourth sub-color filter, the fifth sub-color filter, or the sixth sub-color filter each have a third thickness, a fourth thickness, a fifth thickness, or a sixth thickness; 25. The display device of claim 24, wherein a ratio of the fourth thickness of the fourth sub-color filter to the third thickness of the third sub-color filter is smaller than a ratio of the sixth thickness of the sixth sub-color filter to the fifth thickness of the fifth sub-color filter.

26. the transmittance of the fourth sub-color filter is greater than the transmittance of the third sub-color filter, The display device according to claim 24 , wherein the sixth sub-color filter has a transmittance greater than a transmittance of the fifth sub-color filter.

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