Display device

Abstract

A display device is disclosed. The display device includes: a substrate comprising a flat region and a curved region disposed on one side of the flat region, wherein a first light-emitting region is disposed in the flat region and a second light-emitting region is disposed in the curved region, wherein the first light-emitting region includes a first light-emitting layer and a first color filter layer disposed on the first light-emitting layer, and the second light-emitting region includes a second light-emitting layer and a second color filter layer disposed on the second light-emitting layer, and wherein 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, the fourth peak wavelength being smaller than the third peak wavelength, and the third sub-color filter and the fourth sub-color filter overlapping each other.

Description

Technical Field

[0001] The present invention relates to a display device, and in particular, for example but not limited to, to a display device comprising a color filter layer disposed on a light-emitting layer. Prior Art

[0002] With the development of information society, the demand for display devices for displaying images in various forms has increased. Therefore, various display devices such as liquid crystal displays (LCDs), plasma display panels (PDPs), and organic light emitting displays (OLEDs) have been used recently.

[0003] Among display devices, organic light-emitting display devices are self-luminous and have excellent viewing angles and contrast ratios compared to liquid crystal displays (LCDs). They do not require a separate backlight source, so they can be thin and light, and have advantages in terms of power consumption. In addition, organic light-emitting display devices have the advantages of being able to drive DC low voltages, having fast response speeds, and having particularly low manufacturing costs.

[0004] The organic light-emitting display device has a structure in which an organic light-emitting diode including a light-emitting layer is provided between a cathode for injecting electrons and an anode for injecting holes. The organic light-emitting display device is a display device that utilizes the fact that when electrons generated at the cathode and holes generated at the anode are injected into the light-emitting layer, the injected electrons and holes will combine to generate excitons, and the generated excitons will drop from an excited state to a ground state, thereby emitting light.

[0005] The descriptions provided in the Description of Related Art section should not be assumed to be prior art simply because they are mentioned in or associated with the Description of Related Art section. The Description of Related Art section may contain information describing one or more aspects of the subject technology, and the descriptions in this section do not limit the present invention. Summary of the invention

[0006] As the inventors have recognized, since the brightness of light emitted at a certain angle appears lower than the brightness of light emitted from the front, there is a problem that the brightness appears differently depending on the viewing angle of the screen. Furthermore, various products using displays having a curvature on the side have been released recently, and in the case of displays having such a curvature, there is a problem that the brightness of light emitted from the side having the curvature is reduced compared to the brightness of light emitted from the front.

[0007] The present invention is made in view of the above problems, and one object of the present invention is to provide a display device that can improve the brightness of light emitted from the side and improve the brightness of light emitted in a curved area with a curvature by stacking a first color filter that transmits light with a relatively long wavelength and a second color filter that transmits light with a relatively short wavelength to overlap each other.

[0008] The objects of the present invention are not limited to the above-mentioned objects, and those having ordinary knowledge in the art can clearly understand other objects not mentioned above from the following description.

[0009] According to one aspect of the present invention, the above and other purposes can be achieved by providing a display device, which includes: a substrate, a light-emitting layer disposed on the substrate and emitting a first color, and a color filter layer disposed on the light-emitting layer, wherein 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, the second peak wavelength is smaller than the first peak wavelength, and the first color filter and the second color filter overlap each other.

[0010] Furthermore, the above and other purposes can be achieved by providing a display device, which includes: a substrate including a flat area and a curved area arranged on one side of the flat area, wherein a first light-emitting area is arranged in the flat area, and a second light-emitting area is arranged in the curved area, wherein the first light-emitting area includes a first light-emitting layer and a first color filter layer arranged on the first light-emitting layer, and the second light-emitting area includes a second light-emitting layer and a second color filter layer arranged on the second light-emitting layer, and wherein the second color filter layer 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, the fourth peak wavelength is smaller than the third peak wavelength, and the third sub-color filter and the fourth sub-color filter overlap each other.

[0011] Details of other exemplary embodiments are included in the detailed description and accompanying drawings.

[0012] According to an exemplary embodiment of the present invention, by providing first and second sub-color filters formed to overlap each other and passing light having different peak wavelengths, the brightness of light emitted in a side direction of a display device can be improved.

[0013] According to an exemplary embodiment of the present invention, since the ratio of the thickness of the second sub-color filter to the thickness of the first sub-color filter provided in the flat area and the curved area is set differently, the brightness of light emitted in the front direction in the curved area can be improved.

[0014] According to an exemplary embodiment of the present invention, the brightness of light emitted along the front direction in the bending area can be improved 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 direction to the outer direction of the bending area.

[0015] The effects according to the present invention are not limited to the above examples, and more various effects are included in this specification. Simple diagram description

[0016] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description in conjunction with the accompanying drawings, in which:

[0017] FIG. 1 is a plan view of a display device according to an exemplary embodiment of the present invention.

[0018] FIG. 2 is a schematic perspective view of a display device according to an exemplary embodiment of the present invention.

[0019] FIG. 3 is a cross-sectional view of a display device according to an exemplary embodiment of the present invention.

[0020] 4 is a cross-sectional view of a first light emitting region provided in a display device according to an exemplary embodiment of the present invention. In this case, FIG. 4 corresponds to the cross section II′ of FIG. 1 .

[0021] FIG. 5 is a graph showing a change in brightness according to a wavelength of light emitted from any one light emitting layer of a display device according to an exemplary embodiment of the present invention.

[0022] FIG. 6 is a graph showing a change in transmittance according to a wavelength of a color filter of a display device according to an exemplary embodiment of the present invention.

[0023] 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 exemplary embodiment of the present invention. In this case, FIG. 7 corresponds to the cross sections II′ and II-II′ of FIG. 1 .

[0024] 8 is a graph illustrating a brightness change according to a viewing angle of a first light emitting area and a second light emitting area included in a display device according to another exemplary embodiment of the present invention.

[0025] 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 another exemplary embodiment of the present invention. In this case, FIG. 9 corresponds to the cross-sections II-II′ and III-III′ of FIG. 1 .

[0026] FIG. 10 is a graph showing transmittance of a color filter of a display device according to another exemplary embodiment of the present invention.

[0027] Throughout the drawings and detailed description, unless otherwise described, the same symbols should be understood to refer to the same elements, features, and structures. For the sake of clarity, illustration, and convenience, the relative sizes and depictions of these elements may be exaggerated. Implementation

[0028] The advantages and features of the present invention and methods of achieving the same will be illustrated by the exemplary embodiments described below with reference to the accompanying drawings. However, the present invention may be implemented in different forms and should not be construed as being limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that the present invention will be thorough and complete and fully inform those of ordinary skill in the art to which the present invention belongs. Furthermore, the present invention is limited only by the scope of the claims.

[0029] The shapes, sizes, areas, proportions, angles, and quantities disclosed in the drawings to describe the exemplary embodiments of the present invention are only examples, and the present invention is not limited to the details shown. Throughout the specification, similar symbols represent similar elements. In the following description, when the detailed description of the relevant known functions or configurations is determined to be likely to unnecessarily obscure the key points of the present invention, the detailed description will be omitted.

[0030] When the words "include", "have", "include", "contain", "compose", "made of", "formed of", and "composed of" described herein are used, other parts may be added unless "only" is used. Unless otherwise specified, the singular form may include the plural form.

[0031] When interpreting the elements, even if not explicitly stated, the elements are interpreted as including the error range.

[0032] When describing a positional relationship, for example, when the positional order is described as “on,” “above,” “on,” “under,” “below,” “beside,” “below,” “near,” “close to,” “adjacent to,” “on the side of,” “beside,” unless “immediately” or “directly” is used, the situation where there is no contact between them is included.

[0033] For ease of description, spatially relative terms such as "under", "beneath", "below", "lower", "above", "upper", etc. may be used herein to describe the relationship between one element or feature and another element or feature as shown in the drawings. It should be understood that in addition to the orientation depicted in the drawings, spatially relative terms may also cover different orientations of elements in use or operation. For example, if the elements in the drawings are inverted, elements described as being "under" or "below" other elements or features will be oriented as being "above" the other elements or features. Therefore, the exemplary term "under" may cover both the orientations of under and above. Similarly, the exemplary terms "above" or "above" may cover both the orientations of "above" and "under".

[0034] If a first element is mentioned as being located on a second element, this does not mean that the first element is actually located above the second element in the drawing. The upper and lower parts of the relevant objects may change depending on the orientation of the objects. Therefore, the case where the first element is located "on" the second element includes the case where the first element is located "below" the second element and the case where the first element is located "above" the second element in the drawing or in the actual configuration.

[0035] When describing a temporal relationship, for example, when a temporal order relationship is described as “after,” “subsequently,” “next,” and “before,” unless “immediately” or “directly” is used, discontinuities may be included.

[0036] It should be understood that although the terms "first", "second", "A", "B", "(A)", "(B)" and the like may be used herein to describe various elements, the elements are not limited to these terms. These terms are only used to distinguish one element from another element. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0037] In addition, when describing the elements of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. Each of these terms is not intended to define the nature, order, or sequence of the corresponding elements, but is only used to distinguish the corresponding elements from other elements. When describing that a specific structural element or layer is "connected", "coupled", "attached" or "linked" to another structural element or layer, it is generally interpreted that the other structural element or layer can be directly or indirectly "connected", "coupled", "attached" or "linked" to the structural element or layer.

[0038] It should be understood that the term "at least one" includes all combinations related to any item. For example, "at least one of the first element, the second element, and the third element" may include two or more selected from the first element, the second element, and the third element, and all combinations of each element among the first element, the second element, and the third element.

[0039] The term "device" used herein may refer to a display device including a display panel and a driver for driving the display panel. Examples of display devices may include light-emitting elements, etc. In addition, examples of devices may include notebook computers, televisions, computer monitors, automotive devices, wearable devices, automotive equipment devices, and integrated electronic devices (or devices) or integrated devices (or devices), such as mobile electronic devices such as smart phones or electronic tablets, which are complete products or final products respectively including light-emitting elements, etc., but the embodiments of the present invention are not limited thereto.

[0040] The features of various exemplary embodiments of the present invention may be partially or completely coupled or combined with each other, and may be mutually operated and driven in technology. The exemplary embodiments of the present invention may be implemented independently of each other or may be implemented together in a mutually dependent relationship.

[0041] In the drawings, the same or similar elements are denoted by the same reference numerals even though they are depicted in different drawings.

[0042] The sizes and thicknesses of the components shown in the drawings are shown for the convenience of description, and the present invention is not limited to the sizes and thicknesses of the components shown.

[0043] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the exemplary embodiments belong. It will be further understood that, unless explicitly defined as such herein, terms defined, for example, in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted as an idealized or overly formal meaning.

[0044] In the exemplary embodiments of the present invention, the source electrode and the drain electrode are distinguished from each other for the convenience of description. However, the source electrode and the drain electrode can be used interchangeably. Therefore, the source electrode can be a drain electrode, and the drain electrode can be a source electrode. Moreover, the source electrode in any exemplary embodiment of the present invention can be a drain electrode in another exemplary embodiment of the present invention, and the drain electrode in any exemplary embodiment of the present invention can be a source electrode in another exemplary embodiment of the present invention.

[0045] In one or more exemplary embodiments of the present invention, for the convenience of description, the source region is distinguished from the source electrode, and the drain region is distinguished from the drain electrode. However, the exemplary embodiments of the present invention are not limited to this structure. For example, the source region can be the source electrode, and the drain region can be the drain electrode. Also, the source region can be the drain electrode, and the drain region can be the source electrode.

[0046] FIG. 1 is a plan view of a display device according to an exemplary embodiment of the present invention.

[0047] As can be seen from FIG. 1 , a display device according to an exemplary embodiment of the present invention may include a flat area FA, a first bending area BA1, and a second bending area BA2.

[0048] The flat area FA corresponds to a portion provided to be flat and not curved. The flat area FA may include first light emitting areas E1. These first light emitting areas E1 are provided, and images can be displayed while these first light emitting areas E1 emit light.

[0049] The first light-emitting area E1 may include a plurality of first sub-pixels SP1. The plurality of first sub-pixels SP1 provided in the first light-emitting area E1 may emit red (R) light, green (G) light, and blue (B) light, respectively. Alternatively, the first sub-pixels SP1 provided in the first light-emitting area E1 may emit red (R) light, green (G) light, blue (B) light, and white (W) light. Meanwhile, in FIG. 1 , only a state in which the first light-emitting area E1 is composed of three first sub-pixels SP1 is shown, but the present invention is not limited thereto, and may include four first sub-pixels SP1. In this case, each of the four first sub-pixels SP1 may emit red (R) light, green (G) light, blue (B) light, and white (W) light. Furthermore, the present invention is not limited thereto, and according to the technical level in the art, different numbers of first sub-pixels SP1 may respectively emit light of different colors.

[0050] For example, these sub-pixels SP may include red, green and blue sub-pixels, wherein the red, green and blue sub-pixels may be arranged in a repeated manner. Alternatively, these sub-pixels SP may include red, green, blue and white sub-pixels, wherein the red, green, blue and white sub-pixels may be arranged in a repeated manner, or the red, green, blue and white sub-pixels may be arranged in a quadrilateral shape. For example, the red sub-pixel, the blue sub-pixel and the green sub-pixel may be arranged in sequence along the column direction, or the red sub-pixel, the blue sub-pixel, the green sub-pixel and the white sub-pixel may be arranged in sequence along the column direction. However, in the embodiment of the present invention, the color type, arrangement form and arrangement order of the sub-pixels are not limited, and may be configured in various forms according to the light-emitting characteristics, device life, and device specifications.

[0051] Meanwhile, the sub-pixels may have different light-emitting areas according to the light-emitting characteristics. For example, a sub-pixel that emits light of a different color from the blue sub-pixel may have a different light-emitting area from the blue sub-pixel. For example, a red sub-pixel, a blue sub-pixel, and a green sub-pixel, or a red sub-pixel, a blue sub-pixel, a white sub-pixel, and a green sub-pixel may each have a different light-emitting area.

[0052] The first bending area BA1 may be provided on one side of the flat area FA, for example, on the right side. The first bending area BA1 may be a portion where bending occurs.

[0053] The first curved area BA1 may include a second light emitting area E2 provided to be relatively adjacent to the flat area FA and a third light emitting area E3 provided to be relatively far from the flat area FA. For example, the second light emitting area E2 is closer to the flat area FA than the third light emitting area E3. Therefore, compared with the second light emitting area E2, the third light emitting area E3 is provided outside the display device according to an exemplary embodiment of the present invention.

[0054] The second light emitting area E2 may include a plurality of second sub-pixels SP2, and the third light emitting area E3 may include a plurality of third sub-pixels SP3. In this case, the description of the second sub-pixels SP2 and the third sub-pixels SP3 is the same as the description of the first sub-pixels SP1, and thus repeated description thereof will be omitted.

[0055] The second curved area BA2 may be provided on the other side of the flat area FA, for example, on the left side. The second curved area BA2 may also include a plurality of light emitting areas, and each of these light emitting areas may include a plurality of sub-pixels. Since the description related thereto is the same as that of the first curved area BA1, the repeated description thereof will be omitted.

[0056] FIG. 2 is a schematic perspective view of a display device according to an exemplary embodiment of the present invention.

[0057] As shown in FIG. 2 , a display device according to an exemplary embodiment of the present invention may include a flat area FA, a first bending area BA1, and a second bending area BA2, as described in FIG. 1 .

[0058] The flat area FA alone may maintain a flat state without being bent.

[0059] The first bending area BA1 may maintain a curve at one end (e.g., the right end) of the flat area FA. Specifically, one end (e.g., the right end) of the first bending area BA1 may be folded into the back of the display device relative to the boundary between the flat area FA and the first bending area BA1. Similarly, the second bending area BA2 may maintain a curve at the other end (e.g., the left end) of the flat area FA. Specifically, one end (e.g., the left end) of the second bending area BA2 may be folded into the back of the display device relative to the boundary between the flat area FA and the second bending area BA2. Meanwhile, the method of bending the first bending area BA1 and the second bending area BA2 is not limited thereto. For example, the first bending area BA1 may maintain a curve at the upper end of the flat area FA. Specifically, the upper end of the first bending area BA1 may be folded into the back of the display device relative to the boundary between the flat area FA and the first bending area BA1. Similarly, the second bending area BA2 may maintain a curve at the lower end of the flat area FA. Specifically, the lower end of the second bending area BA2 may be folded into the back of the display device relative to the boundary between the flat area FA and the second bending area BA2, and is not limited thereto.

[0060] FIG. 3 is a cross-sectional view of a display device according to an exemplary embodiment of the present invention.

[0061] As shown in FIG3 , a display device according to an exemplary embodiment of the present invention may include a flat area FA, a first curved area BA1, and a second curved area BA2. In this case, angles of light emitted along the front direction of the display device in the flat area FA, the first curved area BA1, and the second curved area BA2 may be different. In this case, the front direction may be defined as a direction relative to a back surface of the display device according to an exemplary embodiment of the present invention, and the front surface may be defined as an upper surface in the drawing.

[0062] The angles of light emitted in the front direction of the display device in the flat area FA, the first curved area BA1, and the second curved area BA2 may be different, and the angles of light emitted in the front direction of the display device from the inner side of the first curved area BA1 and the second curved area BA2 and the angles of light emitted in the front direction of the display device from the outer side of the first curved area BA1 and the second curved area BA2 may be different. For example, the inner side of the first curved area BA1 and the second curved area BA2 refers to a portion close to the flat area FA, and the outer side of the first curved area BA1 and the second curved area BA2 refers to a portion far from the flat area FA. For example, the angles of light emitted in the front direction of the display device from the portions of the first curved area BA1 and the second curved area BA2 close to the flat area FA and the angles of light emitted in the front direction of the display device from the portions of the first curved area BA1 and the second curved area BA2 far from the flat area FA may be different. For example, the angles of light emitted in the front direction of the display device from the portions of the first curved area BA1 and the second curved area BA2 close to the flat area FA may be smaller than the angles of light emitted in the front direction of the display device from the portions of the first curved area BA1 and the second curved area BA2 far from the flat area FA.

[0063] Light emitted from the flat area FA in the front direction may be emitted from the upper surface of the display device according to the present invention in the normal direction, however, light emitted from the first curved area BA1 in the front direction may form a preset angle with the normal of the upper surface of the display device when emitted. For example, light emitted from a pixel provided in the first curved area BA1 may form a second angle θ2 with the normal of the upper surface of the display device when emitted in the front direction, and light emitted from a pixel provided outside the first curved area BA1 may form a third angle θ3 with the normal of the upper surface of the display device when emitted in the front direction. In this case, as the first curved area BA1 gradually goes outward, the angle formed by the normal of the upper surface of the display device and the front direction may increase. That is, the second angle θ2 may be formed to be smaller than the third angle θ3.

[0064] 4 is a cross-sectional view of a first light emitting region provided in a display device according to an exemplary embodiment of the present invention. In this case, FIG. 4 corresponds to the cross section II′ of FIG. 1 .

[0065] As shown in FIG. 4 , a display device according to an exemplary embodiment of the present invention may include a substrate 100, a buffer layer 110, an active layer 120, a gate insulating layer 130, a gate electrode 140, an interlayer insulating layer 150, a source electrode 161, a drain electrode 162, a planarization layer 170, a dam 190, a first electrode 200, a light emitting layer 210, a second electrode 220, an encapsulation layer 230, a black matrix 240, and a first color filter layer CF1.

[0066] The substrate 100 may be made of glass or plastic. In particular, the substrate 100 may be made of a transparent plastic having a flexible property, such as polyimide (PI). When polyimide is used as the substrate 100, heat-resistant polyimide that can withstand high temperatures may be used in consideration of the fact that a high-temperature deposition process is performed on the substrate 100. Alternatively, the substrate 100 may be made of any one of polyethylene terephthalate (PET), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polycarbonate (PC), polyether sulfone (PES), polyarylate (PAR), polysulfone (PSF), cyclic olefin copolymer (COC), triacetyl cellulose (TAC), polyvinyl alcohol (PVA), and polystyrene (PS), and the present invention is not limited thereto. Although not shown in the drawings, the substrate 100 may include a plurality of substrates, such as a first substrate and a second substrate.

[0067] The buffer layer 110 is 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 insulating material such as silicon oxide, silicon nitride, or a metal oxide. For example, the buffer layer 110 can be made of a single layer or a multi-layer inorganic film. For example, the single layer of the inorganic film can be a silicon oxide (SiO x) film or a silicon nitride (SiN x) film, and the multi-layer inorganic film can be formed by alternately stacking one or more silicon oxide (SiO x) films, one or more silicon nitride (SiN x) films, and one or more amorphous silicon (a-Si), but is not limited thereto, and the buffer layer 110 can be made of an organic insulating material.

[0068] The active layer 120 may be formed on the buffer layer 110. The active layer 120 may include any one of semiconductor materials such as an oxide semiconductor, an amorphous semiconductor, or a polycrystalline semiconductor.

[0069] Oxide semiconductor materials can have excellent effects in preventing leakage current and relatively cheap manufacturing costs. Oxide semiconductors can be made of metal oxides such as zinc (Zn), indium (In), gallium (Ga), tin (Sn) and titanium (Ti) or combinations of metals such as zinc (Zn), indium (In), gallium (Ga), tin (Sn) and titanium (Ti) and their oxides. Specifically, oxide semiconductors can include 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 are not limited thereto.

[0070] The carriers of polycrystalline semiconductor materials, such as electrons and holes, move quickly, thus having high mobility, low energy consumption and excellent reliability. Polycrystalline semiconductors may be made of polycrystalline silicon (poly-Si), but are not limited thereto.

[0071] The amorphous semiconductor material may be made of amorphous silicon (a-Si), but is not limited thereto.

[0072] The active layer 120 may include a channel portion 121 , a first connection portion 122 provided on one side (eg, on the left side) of the channel portion 121 , and a second connection portion 123 provided on the other side (eg, on the right side) of the channel portion 121 .

[0073] The channel portion 121 overlaps the gate electrode 140. By forming in this way, the channel portion 121 is protected by the gate electrode 140 during the conductive process of making a part of the active layer 120 conductive, and thus can maintain semiconductor characteristics in a non-conductive state.

[0074] By performing a plasma treatment conductive process 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 may have conductive properties. By the conductive process, the first connection portion 122 and the second connection portion 123 have excellent conductive properties and may serve as electrodes or wirings.

[0075] The gate insulating layer 130 may be formed on the active layer 120. The gate insulating layer 130 may be formed on the entire surface of the substrate 100, but is not limited thereto, and by patterning a partial region of the gate insulating layer 130, one end and the other end of the gate insulating layer 130 may be formed to correspond to one end and the other end of the gate electrode 140, respectively.

[0076] The gate insulating layer 130 may include a silicon nitride layer SiN x or a silicon oxide layer SiO x, but is not limited thereto. The gate insulating layer 130 may be made of a single layer or multiple layers including an inorganic insulating material and / or an organic insulating material. For example, the gate insulating layer 130 may be formed of a single layer or multiple layers of an inorganic film, for example, the single layer of the inorganic film may be a silicon oxide (SiO x) film or a silicon nitride (SiN x) film, and the multiple layers of the inorganic film may be formed by alternately stacking one or more silicon oxide (SiO x) films, one or more silicon nitride (SiN x) films, and one or more amorphous silicon (a-Si), but the present invention is not limited thereto. In addition, the gate insulating layer 130 may be formed by atomic layer deposition (ALD) or metal organic chemical vapor deposition (MOCVD), but is not limited thereto.

[0077] The gate electrode 140 may be formed on the gate insulating layer 130 .

[0078] The gate electrode 140 may include an aluminum-based metal such as aluminum Al or an aluminum alloy, a silver-based metal such as silver Ag or a silver alloy, a copper-based metal such as copper Cu or a copper alloy, a molybdenum-based metal such as molybdenum Mo or a molybdenum alloy, and at least one of chromium Cr, tantalum Ta, neodymium Nd, and titanium Ti. The gate electrode 140 may have a multilayer structure including at least two different conductor films.

[0079] The interlayer insulating layer 150 may be formed on the gate electrode 140. The interlayer insulating layer 150 insulates the gate electrode 140 from the source electrode 161, and further insulates the gate electrode 140 from the drain electrode 162. The interlayer insulating layer 150 may be made of a single layer or multiple layers including an inorganic insulating material and / or an organic insulating material. For example, the interlayer insulating layer 150 may be formed of a single layer or multiple layers of an inorganic film, for example, the single layer of the inorganic film may be a silicon oxide (SiO x) film or a silicon nitride (SiN x) film, and the multiple layers of the inorganic film may be formed by alternately stacking one or more silicon oxide (SiO x) films, one or more silicon nitride (SiN x) films, and one or more amorphous silicon (a-Si), but the present invention is not limited thereto.

[0080] Contact holes may be formed in the interlayer insulating layer 150. Therefore, a portion of the upper surface of the first connection portion 122 of the active layer 120 may be exposed by any contact hole, and further, a portion of the upper surface of the second connection portion 123 of the active layer 120 may be exposed by another contact hole.

[0081] The source electrode 161 and the drain electrode 162 may be provided on the interlayer insulating layer 150 .

[0082] The source electrode 161 may be electrically connected to the first connection portion 122 of the active layer 120 through the contact hole, and the drain electrode 162 may be electrically connected to the second connection portion 123 of the active layer 120 through the contact hole.

[0083] The source electrode 161 and the drain electrode 162 may be made of the same material as the gate electrode 140, but are not limited thereto. The source electrode 161 and the drain electrode 162 may be made of different materials from the gate electrode 140 and may be made of materials according to knowledge in the art.

[0084] The planarization layer 170 may be formed on the interlayer insulating layer 150, the source electrode 161, and the drain electrode 162. The planarization layer 170 may be formed on the source electrode 161 and the drain electrode 162 to planarize the upper surface of the planarization layer 170. The planarization layer 170 may be used to protect the thin film transistor including the active layer 120, the gate insulating layer 130, the gate electrode 140, the interlayer insulating layer 150, the source electrode 161, and the drain electrode 162, and may be used to planarize the step caused by the thin film transistor.

[0085] A contact hole may be provided in the planarization layer 170, and a portion of the upper surface of the drain electrode 162 may be exposed by the contact hole. However, in some cases, a portion of the upper surface of the source electrode 161 may be exposed by the contact hole, but is not limited thereto.

[0086] The planarization layer 170 may be made of an organic insulating layer material. For example, the planarization layer 170 may be made of an organic insulating material such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, or polyimide resin.

[0087] 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 is not limited thereto.

[0088] The first electrode 200 may be formed on the planarization layer 170, and may be electrically connected to the drain electrode 162 through a contact hole provided in the planarization layer 170. The first electrode 200 may function as an anode.

[0089] The bank 190 may be formed on the first electrode 200. In this case, a partial area of the upper surface of the first electrode 200 that is exposed without being covered by the bank 190 becomes a light emitting area.

[0090] The bank 190 may be made of an organic layer such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, or the like.

[0091] The bank 190 may be made of an opaque material to reduce color mixing between the sub-pixels SP, for example, may be made of black resin, but is not limited thereto.

[0092] Although not shown, a spacer may be disposed on the bank 190. The spacer may ensure a gap between the fine metal mask (FMM) and the first electrode 200 so that the fine metal mask does not contact the first electrode 200 during the deposition process of the light emitting layer 210.

[0093] The light emitting layer 210 may be formed on the first electrode 200. The light emitting layer 210 may include red, green, and blue light emitting layers patterned for each pixel, or may include a white light emitting layer connected to all pixels. When the light emitting layer 210 is made of a white light emitting layer, the light emitting layer 210 may 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 limited thereto. For example, the light emitting layer 210 may include one or more hole injection layers (HILs), hole transport layers (HTLs), electron transport layers (ETLs), and electron injection layers (EILs), but the present invention is not limited thereto.

[0094] The second electrode 220 may be formed on the light emitting layer 210. The second electrode 220 may function as a cathode.

[0095] For example, the second electrode 220 may be formed on the entire surface of the light emitting layer 210 and the bank 190 .

[0096] Depending on the bottom emission type or the top emission type of the display device, one of the first electrode 200 and the second electrode 220 may include a single layer or multiple layers including an opaque conductive material with relatively high reflection efficiency, while the other of the first electrode 200 and the second electrode 220 may include a transparent material, but is not limited thereto.

[0097] For example, the opaque conductive material may include materials with relatively low work functions such as aluminum (Al), silver (Ag), copper (Cu), lead (Pb), molybdenum (Mo), titanium (Ti) and alloys thereof, but the present invention is not limited thereto.

[0098] The encapsulation layer 230 may include a first encapsulation layer 230a, a second encapsulation layer 230b, and a third encapsulation layer 230c. The first to third encapsulation layers 230a to 230c may be sequentially stacked on the second electrode 220, and the first and third encapsulation layers 230a and 230c may be made of inorganic film layers including inorganic materials, and the second encapsulation layer 230b may be made of an organic film layer including organic materials.

[0099] The first encapsulation layer 230a may be formed at the lowest end of the encapsulation layer 230 to contact the upper surface of the second electrode 220. The first encapsulation layer 230a may be made of a material such as silicon nitride SiNx, silicon oxide SiOx, silicon oxynitride SiON, or aluminum oxide Al2O3.

[0100] The second encapsulation layer 230b may be formed on the first encapsulation layer 230a. The second encapsulation layer 230b may be made of a material such as acrylic resin, epoxy resin, polyimide, polyethylene PE, or silicon oxide carbon SiOC.

[0101] The third encapsulation layer 230c may be formed on the second encapsulation layer 230b. The third encapsulation layer 230c may be made of the same material as the first encapsulation layer 230a, but is not limited thereto. The third encapsulation layer 230c may be made of a different material than the first encapsulation layer 230a.

[0102] Meanwhile, the encapsulation layer is not limited to three layers, and for example, may include n layers (where n is an integer greater than 3) alternately stacked between the inorganic encapsulation layer and the organic encapsulation layer.

[0103] The black matrix 240 may be formed on the encapsulation layer 230. Specifically, the black matrix 240 may be formed to overlap the bank 190 to prevent light emitted from the organic light emitting element EL from being introduced into another adjacent sub-pixel. Therefore, the problem of mixing of different lights generated in adjacent sub-pixels may be prevented.

[0104] The first color filter layer CF1 may be formed on the encapsulation layer 230 and the black matrix 240. The first color filter layer CF1 may pass light emitted from the organic light emitting element EL provided in the first sub-pixel SP1. Therefore, the light of the first color emitted by the organic light emitting element EL may pass through the first color filter layer CF1. For example, when the light of the first color is green (G), the first color filter layer CF1 may pass green (G) light, but is not limited thereto. For example, when the light of the first color is blue (B), the first color filter layer CF1 may pass blue (B) light. For example, when the light of the first color is red (R), the first color filter layer CF1 may pass red (R) light.

[0105] According to an exemplary embodiment of the present invention, the first color filter layer CF1 may include a first sub-color filter SF1 and a second sub-color filter SF2.

[0106] The first sub-color filter SF1 and the second sub-color filter SF2 may overlap each other. In this case, the first sub-color filter SF1 may be provided on the encapsulation layer 230, and the second sub-color filter SF2 may be provided on the first sub-color filter SF1. Meanwhile, the present invention is not limited thereto, and the second sub-color filter SF2 may be provided on the encapsulation layer 230, and the first sub-color filter SF1 may be provided on the second sub-color filter SF2.

[0107] By forming in this manner, 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 then guided to the outside.

[0108] The first sub-color filter SF1 and the second sub-color filter SF2 may transmit light of different wavelength ranges. For example, the first sub-color filter SF1 may transmit light in a wavelength range of 500 nm to 650 nm, and the second sub-color filter SF2 may transmit light in a wavelength range of 400 nm to 580 nm.

[0109] The first sub-color filter SF1 and the second sub-color filter SF2 may have maximum transmittance at different wavelengths. Specifically, the first sub-color filter SF1 may have maximum transmittance at a first wavelength, and the second sub-color filter SF2 may have maximum transmittance at a second wavelength. In this case, the first wavelength of the first sub-color filter SF1 may be greater than the second wavelength of the second sub-color filter SF2, and the maximum transmittance of the second sub-color filter SF2 at the second wavelength may be greater than the maximum transmittance of the first sub-color filter SF1 at the first wavelength, but the present invention is not limited thereto.

[0110] According to an exemplary embodiment of the present invention, since 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 can pass through the first sub-color filter SF1 and the second sub-color filter SF2 to emit light outward, the brightness of the light emitted at the first angle θ1 can be improved.

[0111] Meanwhile, the principle of increasing the brightness of light passing through the first sub-color filter SF1 and the second sub-color filter SF2 at the first angle θ1 will be described in more detail with reference to the following FIGS. 5 and 6 .

[0112] FIG. 5 is a graph showing the brightness of each wavelength change according to the viewing angle of light emitted from the organic light emitting element EL, and FIG. 6 is a graph showing the range of wavelengths transmitted by each of the first sub-color filter SF1 and the second sub-color filter SF2 and the light transmittance change according to each wavelength range. In this case, the viewing angle may be defined as the angle of light emitted from the normal to the upper surface of the organic light emitting element EL. For example, the viewing angle of light emitted from the front surface may be 0°, and the viewing angle of light emitted at the first angle θ1 may be the first angle θ1.

[0113] First, as shown in FIG. 5 , for example, when the organic light emitting element (see EL in FIG. 4 ) provided in the first sub-pixel SP1 emits green (G) light, light having a wavelength of about 490 to 570 nm may be emitted. In this case, it can be confirmed that the brightness change according to the wavelength is relatively reduced as the viewing angle increases. For example, when the viewing angle is 0°, the brightness at the peak wavelength λmax is 100%, whereas when the viewing angle is 40°, the brightness at the peak wavelength λmax is about 32%. In this case, assuming that the brightness is measured when the viewing angle is 0°, the brightness change according to each viewing angle is relatively measured.

[0114] Furthermore, as the viewing angle increases, the overall graph of the brightness change according to the wavelength tends to move to the left. For example, it can be seen that the graph is relatively tilted 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 seen that the graph is relatively symmetrical based on the peak wavelength λmax, but when the viewing angle is 40°, the graph is relatively tilted to the left based on the peak wavelength λmax. For example, when the viewing angle is 40°, the peak wavelength λmax tends to move to the left compared to when the viewing angle is 0°.

[0115] In addition, the peak wavelength λmax according to the viewing angle tends to decrease and move to the left as the viewing angle increases. That is, compared with the case where the viewing angle is 0°, when the viewing angle is 40°, the peak wavelength λmax decreases and moves to the left.

[0116] Next, as shown in FIG6, the second sub-color filter SF2 may 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 of FIG4) emits green (G) light, the first sub-color filter SF1 may transmit light in a wavelength range of, for example, 500 nm to 650 nm, and the second sub-color filter SF2 may transmit light in a wavelength range of 400 nm to 580 nm.

[0117] Furthermore, the first sub-color filter SF1 may have a maximum transmittance at a first wavelength λ1, and the second sub-color filter SF2 may have a maximum transmittance at a second wavelength λ2. In this case, the first wavelength λ1 may be a peak wavelength of light transmitted by the first sub-color filter SF1, and the second wavelength λ2 may be a peak wavelength of light transmitted by the second sub-color filter SF2. According to an exemplary embodiment of the present invention, the length of the first wavelength λ1 and the length of the second wavelength λ2 may be within a range of 50 nm from the length of the peak wavelength λmax of light emitted by the organic light emitting element (see EL of 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 the length of the first wavelength λ1 may 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 ), and the length of the second wavelength λ2 is less than the length of the peak wavelength λmax of the light emitted by the organic light emitting element (see EL in FIG. 4 ), and the length of the second wavelength λ2 may 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 ). On the other hand, FIG. 6 only shows the peak wavelength λmax of the light emitted by the organic light emitting element (see EL in FIG. 4 ) set between the first wavelength λ1 and the second wavelength λ2, but 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 ) is within a range of 520 nm to 530 nm, the length of the second wavelength λ2 is greater than 470 nm, and the length of the first wavelength λ1 is less than 580 nm, but the present invention is not limited thereto.

[0118] According to an exemplary embodiment of the present invention, the maximum transmittance at the second wavelength λ2 may be greater than the maximum transmittance at the first wavelength λ1. Meanwhile, the brightness of light seen through an actual display device is proportional to the product of the brightness of 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 greater than the transmittance of the first sub-color filter SF1 having the maximum transmittance at the first wavelength λ1, the brightness of light advancing at the first angle θ1 may be improved. Therefore, according to an exemplary embodiment of the present invention, the brightness of light perceived on one side of the flat area (see FA in FIG. 3 ) of the display device (e.g., light advancing at the first angle θ1) may be improved.

[0119] Referring back 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. In this case, the first thickness t1 may be 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 exemplary embodiment of the present invention, the ratio of the first thickness t1 of the first sub-color filter SF1 to the second thickness t2 of the second sub-color filter SF2 may be adjusted to improve the brightness of the light emitted at the first angle θ1. Meanwhile, this will be described in more detail with reference to FIGS. 7 and 10 .

[0120] FIG7 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 exemplary embodiment of the present invention. In this case, FIG7 corresponds to the cross-sections II′ and II-II′ of FIG1. Meanwhile, in the exemplary embodiment of FIG7, except for the configuration of the third sub-color filter and the fourth sub-color filter, the first sub-pixel is the same as the first sub-pixel of FIG4, and the second sub-pixel is the same as the second sub-pixel of FIG4, so the different configurations will be mainly described below.

[0121] As shown in FIG. 7 , a display device according to an exemplary embodiment of the present invention may include a substrate 100, a buffer layer 110, an active layer 120, a gate insulating layer 130, a gate electrode 140, an interlayer insulating layer 150, a source electrode 161, a drain electrode 162, a planarization layer 170, a dam 190, a first electrode 200, a light emitting layer 210, a second electrode 220, an encapsulation layer 230, a black matrix 240, a first color filter layer CF1 provided in a first sub-pixel SP1, and a second color filter layer CF2 provided in a second sub-pixel SP2.

[0122] According to an exemplary embodiment of the present invention, as described in FIG3, the second sub-pixel SP2 corresponds to any one of the plurality of sub-pixels provided in the first curved area (see BA1 of FIG3). The second sub-pixel SP2 is provided in the first curved area (see BA1 of FIG3) having a curvature. Therefore, light emitted from the organic light emitting element EL provided in the second sub-pixel SP2 toward the front surface of the display device according to the exemplary embodiment of the present invention forms a second angle θ2 with the normal line of the upper surface of the organic light emitting element EL.

[0123] Different from the first sub-pixel SP1, the second sub-pixel SP2 may include a second color filter layer CF2.

[0124] The second color filter layer CF2 may be formed on the encapsulation layer 230 and the black matrix 240. The second color filter layer CF2 may pass light emitted from the organic light emitting element EL provided in the second sub-pixel SP2. Therefore, the light of the first color emitted by the organic light emitting element EL may pass through the second color filter layer CF2. For example, when the light of the first color is green (G), the second color filter layer CF2 may pass green (G) light, but is not limited thereto. For example, when the light of the first color is blue (B), the second color filter layer CF2 may pass blue (B) light. For example, when the light of the first color is red (R), the second color filter layer CF2 may pass red (R) light.

[0125] According to an exemplary embodiment of the present invention, the second color filter layer CF2 may include a third sub-color filter SF3 and a fourth sub-color filter SF4.

[0126] The third sub-color filter SF3 and the fourth sub-color filter SF4 may overlap each other. In this case, the third sub-color filter SF3 may be provided on the encapsulation layer 230, and the fourth sub-color filter SF4 may be provided on the third sub-color filter SF3. Meanwhile, the present invention is not limited thereto, and the fourth sub-color filter SF4 may be provided on the encapsulation layer 230, and the third sub-color filter SF3 may be provided on the fourth sub-color filter SF4.

[0127] Meanwhile, 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, and thus the manufacturing time and cost can be reduced. However, the present invention is not limited thereto, and 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, the manufacturing time and cost can also be reduced.

[0128] The light emitted from the organic light emitting element EL is guided to the outside after passing through the third sub-color filter SF3 and the fourth sub-color filter SF4 .

[0129] The third sub-color filter SF3 and the fourth sub-color filter SF4 may transmit light having different wavelength ranges. For example, the third sub-color filter SF3 may transmit light having a wavelength range of 500 nm to 650 nm, and the fourth sub-color filter SF4 may transmit light having a wavelength range of 400 nm to 580 nm. Meanwhile, the third sub-color filter SF3 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, and thus repeated descriptions thereof will be omitted.

[0130] The third sub-color filter SF3 and the fourth sub-color filter SF4 may have maximum transmittance at different wavelengths. Specifically, the third sub-color filter SF3 may have maximum transmittance at the third wavelength, and the fourth sub-color filter SF4 may have maximum transmittance at the fourth wavelength. In this case, the third wavelength of the third sub-color filter SF3 may be greater than the fourth wavelength of the fourth sub-color filter SF4, and the maximum transmittance of the fourth sub-color filter SF4 at the fourth wavelength may be greater than the maximum transmittance of the third sub-color filter SF3 at the third wavelength.

[0131] According to an exemplary embodiment of the present invention, since 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 to emit light outward, the brightness of the light viewed from the viewing angle of the second angle θ2 can be improved.

[0132] The third sub-color filter SF3 may have a third thickness t3, and the fourth sub-color filter SF4 may have a fourth thickness t4. In this case, the third thickness t3 may be the shortest distance between the lower surface and the upper surface of the third sub-color filter SF3, and the fourth thickness t4 may be the shortest distance between the lower surface and the upper surface of the fourth sub-color filter SF4. According to an exemplary embodiment of the present invention, the brightness of the light emitted at the second angle θ2 may be improved by optimizing the ratio of the third thickness t3 of the third sub-color filter SF3 to the fourth thickness t4 of the fourth sub-color filter SF4.

[0133] According to an exemplary 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 may be stacked at different thickness ratios. Specifically, the ratio of the thickness of the first sub-color filter SF1 provided in the first color filter layer CF1 to the thickness of the second sub-color filter SF2 and the ratio of the thickness of the third sub-color filter SF3 provided in the second color filter layer CF2 to the thickness of the fourth sub-color filter SF4 may be different from each other.

[0134] According to an exemplary embodiment of the present invention, a ratio of the thickness of the second sub-color filter SF2 to the thickness of the first sub-color filter SF1 may be provided to be smaller than a ratio of the thickness of the fourth sub-color filter SF4 to the thickness of the third sub-color filter SF3. Therefore, a ratio of the fourth sub-color filter SF4 in the second color filter layer CF2 in the second sub-pixel SP2 transmitting light of a relatively short wavelength may be greater than a ratio of the second sub-color filter SF2 in the first color filter layer CF1 in the first sub-pixel SP1 transmitting light of a relatively short wavelength.

[0135] By forming in this way, the light emitted from the organic light emitting element EL of the second sub-pixel SP2 can better pass light having a relatively short wavelength, thereby improving the brightness of the light emitted at the second angle θ2.

[0136] Meanwhile, FIG. 7 only illustrates a state 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, but the present invention is not limited thereto, and the first sub-pixel SP1 may include only one layer of the first sub-color filter SF1, and 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 include only one layer of the third sub-color filter SF3. Even in the case of formation as described above, the brightness of light guided to the front of the display device in the first bending area (see BA1 in FIG. 3 ) or the second bending area (see BA2 in FIG. 3 ) can still be improved.

[0137] 8 is a diagram showing brightness changes according to viewing angles of first and second light-emitting regions included in a display device according to another exemplary embodiment of the present invention. In this case, a relates to any pixel of the display device according to the comparative example, b relates to the first sub-pixel SP1 according to the exemplary embodiment of FIG. 7 , and c relates to the second sub-pixel SP2 according to the exemplary embodiment of FIG. 7 . Meanwhile, any pixel provided in the display device according to the comparative example does not include a sub-color filter that transmits light having a relatively short wavelength.

[0138] From a, b and c, it can be seen that compared with 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 seen that the brightness of b and c that changes with the viewing angle is relatively higher than the brightness of a.

[0139] Furthermore, it can be seen from b and c that the ratio of the thickness of the fourth sub-color filter SF4 to the thickness of the third sub-color filter SF3 is formed to be greater than the ratio of the thickness of the second sub-color filter SF2 to the thickness of the first sub-color filter SF1, so that in the case of c, light in a relatively short wavelength band can be further transmitted, so that even at a larger viewing angle, a relatively higher brightness than that of b can be ensured.

[0140] FIG9 is a cross-sectional view of a second light emitting area and a third light emitting area provided in a display device according to another exemplary embodiment of the present invention. In this case, FIG9 corresponds to the cross-sections II-II′ and III-III′ of FIG1. Meanwhile, in the exemplary embodiment of FIG9, except for the configuration of the fifth sub-color filter and the sixth sub-color filter, the second sub-pixel is the same as the second sub-pixel of FIG7, and the third sub-pixel is the same as the second sub-pixel of FIG7, so the different configurations will be mainly described.

[0141] As shown in FIG. 9 , a display device according to an exemplary embodiment of the present invention may include a substrate 100, a buffer layer 110, an active layer 120, a gate insulating layer 130, a gate electrode 140, an interlayer insulating layer 150, a source electrode 161, a drain electrode 162, a planarization layer 170, a dam 190, a first electrode 200, a light emitting layer 210, a second electrode 220, an encapsulation 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.

[0142] According to an exemplary embodiment of the present invention, as described in FIG. 3 , the third sub-pixel SP3 corresponds to any one of the plurality of sub-pixels provided in the first bending area (see BA1 of FIG. 3 ). The third sub-pixel SP3 is provided more outside the display device than the second sub-pixel SP2 located in the first bending area (see BA1 of FIG. 3 ). For example, the third sub-pixel SP3 is farther from the flat area of the display device relative to the second sub-pixel SP2. Therefore, light emitted from the organic light emitting element EL provided in the third sub-pixel SP3 toward the front surface of the display device according to the exemplary embodiment of the present invention forms a third angle θ3 with the normal of the upper surface of the organic light emitting element EL. In this case, the third angle θ3 is greater than the second angle θ2 formed by the light guided from the second sub-pixel SP2 toward the front surface of the display device.

[0143] Different from the second sub-pixel SP2, the third sub-pixel SP3 may include a third color filter layer CF3.

[0144] The third color filter layer CF3 may be formed on the encapsulation layer 230 and the black matrix 240. The third color filter layer CF3 may pass light emitted from the organic light emitting element EL provided in the third sub-pixel SP3. Therefore, the first color light emitted by the organic light emitting element EL may pass through the third color filter layer CF3. For example, when the first color light is green (G), the third color filter layer CF3 may pass green (G) light, but is not limited thereto. For example, when the first color light is blue (B), the third color filter layer CF3 may pass blue (B) light. For example, when the first color light is red (R), the third color filter layer CF3 may pass red (R) light.

[0145] According to an exemplary embodiment of the present invention, the third color filter layer CF3 may include a fifth sub-color filter SF5 and a sixth sub-color filter SF6.

[0146] The fifth sub-color filter SF5 and the sixth sub-color filter SF6 may overlap each other. In this case, the fifth sub-color filter SF5 may be provided on the encapsulation layer 230, and the sixth sub-color filter SF6 may be provided on the fifth sub-color filter SF5. Meanwhile, the present invention is not limited thereto, and the sixth sub-color filter SF6 may be provided on the encapsulation layer 230, and the fifth sub-color filter SF5 may be provided on the sixth sub-color filter SF6.

[0147] By forming in this manner, light emitted from the organic light emitting element EL can pass through the fifth sub-color filter SF5 and the sixth sub-color filter SF6 and then be guided to the outside.

[0148] The fifth sub-color filter SF5 and the sixth sub-color filter SF6 may transmit light of different wavelength ranges. For example, the fifth sub-color filter SF5 may transmit light of a wavelength range of 500 nm to 650 nm, and the sixth sub-color filter SF6 may transmit light of a wavelength range of 400 nm to 580 nm. Meanwhile, the fifth sub-color filter SF5 is identical to the third sub-color filter SF3 except for the thickness, and the sixth sub-color filter SF6 is identical to the fourth sub-color filter SF4 except for the thickness, and thus repeated descriptions thereof will be omitted.

[0149] The fifth sub-color filter SF5 and the sixth sub-color filter SF6 may have maximum transmittance at different wavelengths. Specifically, the fifth sub-color filter SF5 may have maximum transmittance at the fifth wavelength, and the sixth sub-color filter SF6 may have maximum transmittance at the sixth wavelength. In this case, 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 of the sixth sub-color filter SF6 at the sixth wavelength may be greater than the maximum transmittance of the fifth sub-color filter SF5 at the fifth wavelength.

[0150] According to an exemplary embodiment of the present invention, since 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 to emit light outward, the brightness of the light viewed from the viewing angle of the third angle θ3 can be improved.

[0151] The fifth sub-color filter SF5 may have a fifth thickness t5, and the sixth sub-color filter SF6 may have a sixth thickness t6. In this case, the fifth thickness t5 may be the shortest distance between the lower surface and the upper surface of the fifth sub-color filter SF5, and the sixth thickness t6 may be the shortest distance between the lower surface and the upper surface of the sixth sub-color filter SF6. According to an exemplary embodiment of the present invention, the brightness of the light emitted at the third angle θ3 may be improved by optimizing the ratio of the fifth thickness t5 of the fifth sub-color filter SF5 to the sixth thickness t6 of the sixth sub-color filter SF6.

[0152] According to an exemplary 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 may be stacked at different thickness ratios. Specifically, the ratio of the thickness of the third sub-color filter SF3 provided in the second color filter layer CF2 to the thickness of the fourth sub-color filter SF4 and the ratio of the thickness of the fifth sub-color filter SF5 provided in the third color filter layer CF3 to the thickness of the sixth sub-color filter SF6 may be different from each other.

[0153] According to an exemplary 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. Therefore, the ratio of the sixth sub-color filter SF6 in the third color filter layer CF3 in the third sub-pixel SP3 transmitting light of a relatively short wavelength may be greater than the ratio of the fourth sub-color filter SF4 in the second color filter layer CF2 in the second sub-pixel SP2 transmitting light of a relatively short wavelength.

[0154] By forming in this way, the light emitted from the organic light emitting element EL of the third sub-pixel SP3 can better pass light having a relatively short wavelength, thereby improving the brightness of the light emitted at the third angle θ3.

[0155] Meanwhile, although the first sub-pixel SP1 provided in the flat area FA is not specifically shown in FIG9 , in another example, as shown in FIG4 , the first sub-pixel SP1 provided in the flat area FA may include the first sub-color filter SF1 and the second sub-color filter SF2. Furthermore, in another example, the first sub-pixel SP1 may include only one layer of the first sub-color filter SF1, and the present invention is not limited thereto.

[0156] FIG. 10 is a graph showing transmittance of a color filter of a display device according to another exemplary embodiment of the present invention.

[0157] Table 1 below relates to the brightness of light emitted at 40° measured by adjusting the ratio of the thickness of the first sub-color filter SF1 and the second sub-color filter SF2 of the comparative example and the embodiments 1 to 3. In this case, the comparative example includes only the first sub-color filter SF1 that transmits light in the wavelength range of 500 nm to 650 nm, and the embodiments 1 to 3 respectively include the first sub-color filter SF1 that transmits light in the wavelength range of 500 nm to 650 nm and the second sub-color filter SF2 that transmits light in the wavelength range of 400 nm to 580 nm, and are provided by adjusting the ratio of the thickness of the first sub-color filter SF1 to the second sub-color filter SF2 differently.

[0158] [Table 1] Thickness ratio (SF1:SF2) Brightness(@40°,%) Comparative Example - 34% Example 1 1:1 36% Example 2 3:7 38% Example 3 1:9 40%

[0159] Please refer to Figure 10 and Table 1. First, it can be seen by comparing the comparative example and Examples 1 to 3 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, in the case of Examples 1 to 3, it can be seen that the brightness is increased compared to the comparative example in which only the first sub-color filter SF1 is provided.

[0160] Furthermore, referring to 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 transmittance of light in the wavelength range of 400 to 580 nm increases relatively. Therefore, 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 brightness measured at 40° increases.

[0161] Therefore, the present invention can have the following advantages.

[0162] According to an exemplary embodiment of the present invention, by providing first and second sub-color filters formed to overlap each other and passing light having different peak wavelengths, the brightness of light emitted in a side direction of a display device can be improved.

[0163] According to an exemplary embodiment of the present invention, since the ratio of the thickness of the second sub-color filter provided in the flat area and the curved area to the thickness of the first sub-color filter is set differently, the brightness of light emitted in the curved area in the front direction can be improved.

[0164] According to an exemplary embodiment of the present invention, the brightness of light emitted along the front direction in the bending area can be improved 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 direction to the outer direction of the bending area.

[0165] Exemplary embodiments of the present invention can also be described as follows:

[0166] According to an exemplary embodiment of the present invention, a display device is provided, which includes: a substrate, a light-emitting layer disposed on the substrate and emitting a first color, and a color filter layer disposed on the light-emitting layer, wherein 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, the second peak wavelength is smaller than the first peak wavelength, and the first color filter and the second color filter overlap each other.

[0167] The color filter layer is disposed in the flat area of the substrate.

[0168] The color filter layer is disposed in the curved area of the substrate.

[0169] The transmittance of the second color filter is greater than the transmittance of the first color filter.

[0170] The first color filter has a first thickness, and the second color filter has a second thickness, and the ratio of the second thickness to the first thickness is greater than 1.

[0171] The first color filter has a first thickness, and the second color filter has a second thickness, and the ratio of the first thickness to the second thickness ranges from 1:1 to 1:9.

[0172] The first color filter and the second color filter allow light having a first color to pass therethrough.

[0173] The first peak wavelength of the first color filter is greater than the peak wavelength of the light-emitting layer, and the difference between the first peak wavelength and the peak wavelength is within the range of 50 nm.

[0174] The second peak wavelength of the second color filter is smaller than the peak wavelength of the light-emitting layer, and the difference between the second peak wavelength and the peak wavelength is within the range of 50 nm.

[0175] The light emitting layer emits any one of red light, green light, and blue light.

[0176] According to an exemplary embodiment of the present invention, a display device is provided, comprising: a substrate comprising a flat area and a curved area arranged on one side of the flat area, wherein a first light-emitting area is arranged in the flat area, and a second light-emitting area is arranged in the curved area, wherein the first light-emitting area comprises a first light-emitting layer and a first color filter layer arranged on the first light-emitting layer, and the second light-emitting area comprises a second light-emitting layer and a second color filter layer arranged on the second light-emitting layer, and wherein the second color filter layer comprises 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, the fourth peak wavelength is smaller than the third peak wavelength, and the third sub-color filter and the fourth sub-color filter overlap each other.

[0177] The first color filter layer includes a layer body, and the second color filter layer includes two layers of a third sub-color filter and a fourth color filter.

[0178] The third sub-color filter has a third thickness, and the fourth sub-color filter has a fourth thickness, and the ratio of the fourth thickness to the third thickness is greater than 1.

[0179] The third sub-color filter has a third thickness, and the fourth sub-color filter has a fourth thickness, and the ratio of the third thickness to the fourth thickness ranges from 1:1 to 1:9.

[0180] The third peak wavelength of the third sub-color filter is greater than the peak wavelength of the second light-emitting layer, and the difference between the third peak wavelength and the peak wavelength is within the range of 50 nm.

[0181] The fourth peak wavelength of the fourth sub-color filter is smaller than the peak wavelength of the second light-emitting layer, and the difference between the fourth peak wavelength and the peak wavelength is within the range of 50 nm.

[0182] The first color filter layer includes a first sub-color filter with maximum transmittance at a first peak wavelength and a second sub-color filter with maximum transmittance at a second peak wavelength, and the first sub-color filter and the second sub-color filter overlap each other.

[0183] The first sub-color filter is arranged below the second sub-color filter, and the third sub-color filter is arranged below the fourth sub-color filter.

[0184] The first to fourth sub-color filters respectively comprise a first thickness, a second thickness, a third thickness and a fourth thickness, and the ratio of the second thickness of the second sub-color filter to the first thickness of the first sub-color filter is smaller than the ratio of the fourth thickness of the fourth sub-color filter to the third thickness of the third sub-color filter.

[0185] The transmittance of the second sub-color filter is greater than the transmittance of the first sub-color filter, and the transmittance of the fourth sub-color filter is greater than the transmittance of the third sub-color filter.

[0186] The display device further includes: a third light-emitting area arranged in the curved area and outside the second light-emitting area, wherein the third light-emitting area includes a third light-emitting layer and a third color filter layer arranged on the third light-emitting layer, and 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, and the fifth sub-color filter and the sixth sub-color filter overlap each other.

[0187] The third to sixth sub-color filters have a third thickness, a fourth thickness, a fifth thickness, and a sixth thickness, respectively, and the ratio of the fourth thickness of the fourth sub-color filter to the third thickness of the third sub-color filter is smaller than the ratio of the sixth thickness of the sixth sub-color filter to the fifth thickness of the fifth sub-color filter.

[0188] The transmittance of the fourth sub-color filter is greater than the transmittance of the third sub-color filter, and the transmittance of the sixth sub-color filter is greater than the transmittance of the fifth sub-color filter.

[0189] The display device further includes: a third light-emitting area arranged in the curved area and outside the second light-emitting area, wherein the third light-emitting area includes a third light-emitting layer and a third color filter layer arranged on the third light-emitting layer, 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, and the fifth sub-color filter and the sixth sub-color filter overlap each other.

[0190] The third to sixth sub-color filters respectively comprise a third thickness, a fourth thickness, a fifth thickness and a sixth thickness, and wherein the ratio of the fourth thickness of the fourth sub-color filter to the third thickness of the third sub-color filter is smaller than the ratio of the sixth thickness of the sixth sub-color filter to the fifth thickness of the fifth sub-color filter.

[0191] The transmittance of the fourth sub-color filter is greater than the transmittance of the third sub-color filter, and the transmittance of the sixth sub-color filter is greater than the transmittance of the fifth sub-color filter.

[0192] It is obvious to those with ordinary knowledge in the art that various substitutions, modifications and changes can be made within the scope of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention is represented by the scope of the claims, and all changes or modifications derived from the meaning, scope and equivalent concepts of the scope of the claims should be interpreted as included within the scope of the present invention.

[0193] 100:Substrate 110: Buffer layer 120: Active layer 121: Channel Department 122: first connection part 123: Second connection part 130: Gate insulation layer 140: Gate electrode 150: Interlayer insulation layer 161: Source electrode 162: Drain electrode 170: Planarization layer 190: Embankment 200: first electrode 210: Luminous layer 220: Second electrode 230: Encapsulation layer 230a: first encapsulation layer 230b: second encapsulation layer 230c: third packaging layer 240: Black Matrix BA1: First bending area BA2: Second Bend Area CF1: First color filter layer CF2: Second color filter layer CF3: Third color filter layer E1: The first luminous area E2: Second light-emitting area E3: The third luminous area EL: Organic light emitting element FA: Flat Area II′,II-II′,III-III′: Section SF1: First sub-color filter SF2: Second sub-color filter SF3: Third sub-color filter SF4: Fourth sub-color filter SF5: The Fifth Subcolor Filter SF6: Sixth sub-color filter SP1: First sub-pixel SP2: Second sub-pixel SP3: The third sub-pixel t1: first thickness t2: second thickness t3: third thickness t4: fourth thickness t5: fifth thickness t6: sixth thickness λ1: first wavelength λ2: Second wavelength λmax: Peak wavelength θ1: first angle θ2: Second angle θ3: The third angle

Claims

1. A display device comprising: a substrate; a light-emitting layer disposed on the substrate and emitting a first color; and a color filter layer disposed on the light-emitting layer, wherein the color filter layer includes a first color filter having maximum transmittance at a first peak wavelength and a second color filter having maximum transmittance at a second peak wavelength, the second peak wavelength being smaller than the first peak wavelength, and the first color filter and the second color filter overlapping each other; wherein the maximum transmittance of the second color filter is greater than the maximum transmittance of the first color filter.

2. The display device as claimed in claim 1, wherein the color filter layer is disposed in a flat area of ​​the substrate.

3. The display device as claimed in claim 1, wherein the color filter layer is disposed in a curved region of the substrate.

4. The display device as claimed in claim 1, wherein the first color filter has a first thickness, and the second color filter has a second thickness, and the ratio of the second thickness to the first thickness is 1 or more.

5. The display device as claimed in claim 1, wherein the first color filter has a first thickness, and the second color filter has a second thickness, and the ratio of the first thickness to the second thickness is in the range of 1:1 to 1:

9.

6. The display device as claimed in claim 1, wherein the first color filter and the second color filter allow light having the first color to pass through.

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

8. The display device as claimed in claim 1, wherein the second peak wavelength of the second color filter is less than the peak wavelength of the light-emitting layer, and the difference between the second peak wavelength and the peak wavelength is within the range of 50 nm.

9. The display device as claimed in claim 1, wherein the light-emitting layer emits any one of red light, green light, and blue light.

10. A display device comprising: a substrate, including a flat region and a curved region disposed on one side of the flat region, wherein a first light-emitting region is disposed in the flat region and a second light-emitting region is disposed in the curved region, wherein the first light-emitting region includes a first light-emitting layer and a first color filter layer disposed on the first light-emitting layer, and the second light-emitting region includes a second light-emitting layer and a second color filter layer disposed on the second light-emitting layer, and wherein 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, the fourth peak wavelength being smaller than the third peak wavelength, and the third sub-color filter and the fourth sub-color filter overlapping each other.

11. The display device as claimed in claim 10, wherein the first color filter layer comprises a layer body, and wherein the second color filter layer comprises two layers of the third sub-color filter and the fourth color filter.

12. The display device as claimed in claim 11, wherein the third sub-color filter has a third thickness, and the fourth sub-color filter has a fourth thickness, and the ratio of the fourth thickness to the third thickness is 1 or more.

13. The display device as claimed in claim 11, wherein the third sub-color filter has a third thickness and the fourth sub-color filter has a fourth thickness, and the ratio of the third thickness to the fourth thickness is in the range of 1:1 to 1:

9.

14. The display device as claimed in claim 11, wherein the third peak wavelength of the third sub-color filter is greater than a peak wavelength of the second light-emitting layer, and the difference between the third peak wavelength and the peak wavelength is within a range of 50 nm.

15. The display device as claimed in claim 11, wherein the fourth peak wavelength of the fourth sub-color filter is less than a peak wavelength of the second light-emitting layer, and the difference between the fourth peak wavelength and the peak wavelength is within a range of 50 nm.

16. The display device as claimed in claim 10, wherein the first color filter layer comprises a first sub-color filter having maximum transmittance at a first peak wavelength and a second sub-color filter having maximum transmittance at a second peak wavelength, and the first sub-color filter and the second sub-color filter overlap each other.

17. The display device as claimed in claim 16, wherein the first sub-color filter is disposed below the second sub-color filter, and wherein the third sub-color filter is disposed below the fourth sub-color filter.

18. The display device as claimed in claim 16, wherein the first sub-color filter to the fourth sub-color filter each include a first thickness, a second thickness, a third thickness and a fourth thickness, and wherein the ratio of the second thickness of the second sub-color filter to the first thickness of the first sub-color filter is less than the ratio of the fourth thickness of the fourth sub-color filter to the third thickness of the third sub-color filter.

19. The display device as claimed in claim 16, wherein the maximum transmittance of the second sub-color filter is greater than the maximum transmittance of the first sub-color filter, and wherein the maximum transmittance of the fourth sub-color filter is greater than the maximum transmittance of the third sub-color filter.

20. The display device as claimed in claim 16 further comprises: a third light-emitting region disposed in the curved region and outside the second light-emitting region, wherein the third light-emitting region comprises a third light-emitting layer and a third color filter layer disposed on the third light-emitting layer, and wherein the third color filter layer comprises a fifth sub-color filter having maximum transmittance at a fifth peak wavelength and a sixth sub-color filter having maximum transmittance at a sixth peak wavelength, and the fifth sub-color filter and the sixth sub-color filter overlap each other.

21. The display device as claimed in claim 20, wherein the third sub-color filter to the sixth sub-color filter each have a third thickness, a fourth thickness, a fifth thickness and a sixth thickness, and wherein the ratio of the fourth thickness of the fourth sub-color filter to the third thickness of the third sub-color filter is less than the ratio of the sixth thickness of the sixth sub-color filter to the fifth thickness of the fifth sub-color filter.

22. The display device as claimed in claim 20, wherein the maximum transmittance of the fourth sub-color filter is greater than the transmittance of the third sub-color filter, and wherein the maximum transmittance of the sixth sub-color filter is greater than the transmittance of the fifth sub-color filter.

23. The display device as claimed in claim 10 further comprises: a third light-emitting region disposed in the curved region and outside the second light-emitting region, wherein the third light-emitting region comprises a third light-emitting layer and a third color filter layer disposed on the third light-emitting layer, wherein the third color filter layer comprises a fifth sub-color filter having maximum transmittance at a fifth peak wavelength and a sixth sub-color filter having maximum transmittance at a sixth peak wavelength, and the fifth sub-color filter and the sixth sub-color filter overlap each other.

24. The display device as claimed in claim 23, wherein the third sub-color filter to the sixth sub-color filter each include a third thickness, a fourth thickness, a fifth thickness and a sixth thickness, and wherein the ratio of the fourth thickness of the fourth sub-color filter to the third thickness of the third sub-color filter is less than the ratio of the sixth thickness of the sixth sub-color filter to the fifth thickness of the fifth sub-color filter.

25. The display device as claimed in claim 23, wherein the maximum transmittance of the fourth sub-color filter is greater than the transmittance of the third sub-color filter, and wherein the maximum transmittance of the sixth sub-color filter is greater than the transmittance of the fifth sub-color filter.

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