Display device

Abstract

A display device is disclosed. The display device includes: a substrate including a flat area in which a first light emitting area including a first light emitting layer and a first color filter layer disposed on the first light emitting layer and a second light emitting layer including a second color filter layer disposed on the second light emitting layer are disposed and a bending area disposed on one side of the flat area, and in which a second light emitting area including a second color filter layer disposed on the second light emitting layer is disposed; 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 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 shorter than the third peak wavelength, and the third sub-color filter and the fourth sub-color filter overlap each other.

Description

Technical Field

[0001] The present disclosure relates to a display device, and more particularly, for example but not limited to, a display device including a color filter disposed on a light emitting layer. Background Art

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

[0003] Among display devices, an organic light emitting display device is a self-emitting type, has excellent viewing angles and contrast ratios compared to a liquid crystal display (LCD), and does not require a separate backlight, so that it can be thin and light, and is advantageous in power consumption. In addition, the organic light emitting display device has advantages such as being able to drive at a low DC voltage, having a fast response speed, and having a particularly low manufacturing cost.

[0004] The organic light emitting display device has a structure in which an organic light emitting diode including a light emitting layer is disposed between a cathode for injecting electrons and an anode for injecting holes. The organic light emitting display device is a display device that uses the following principle: when electrons generated at the cathode and holes generated at the anode are injected into the light emitting layer, the injected electrons and holes combine to generate excitons, and the generated excitons drop from the excited state to the ground state to emit light.

[0005] The descriptions provided in the description of the background art section should not be assumed to be prior art merely because they are mentioned in the description of the background art section or are associated with the description of the background art section. The description of the background art section may include information describing one or more aspects of the subject technology, and the description in this section does not limit the present invention. Summary of the Invention

[0006] The inventors have recognized that there is a problem that the brightness varies depending on the viewing angle of the screen because the brightness of light emitted at a specific angle is lower than the brightness of light emitted from the front. In addition, various products using displays having a curvature on the side have recently been released, and in the case where the display has such a curvature, there is a problem that the brightness of light emitted from the curved side is lower than the brightness of light emitted from the front.

[0007] In view of the above problems, the present disclosure is made, and an object of the present disclosure 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 bent region having a curvature by laminating a first color filter that transmits light having a longer wavelength and a second color filter that transmits light having a shorter wavelength so as to overlap each other.

[0008] The object of the present disclosure is not limited to the above object, and those skilled in the art can clearly understand other objects not mentioned above from the following description.

[0009] According to one aspect of the present disclosure, the above and other objects can be achieved by providing a display device including: a substrate; a light-emitting layer disposed on the substrate and emitting first-color light; 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 shorter than the first peak wavelength, and the first color filter and the second color filter overlap each other.

[0010] In addition, the above and other objects can be achieved by providing a display device including: a substrate including a flat region and a bent 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 bent region, 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 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 shorter than the third peak wavelength, and the third sub-color filter and the fourth sub-color filter overlap each other.

[0011] Other details of the exemplary embodiments are included in the detailed description and the drawings.

[0012] According to an exemplary embodiment of the present disclosure, by providing a first sub-color filter and a second sub-color filter that are formed to overlap each other and transmit light having different peak wavelengths, the brightness of the light emitted in the lateral direction of the display device can be increased.

[0013] According to an exemplary embodiment of the present disclosure, since the ratio of the thickness of the second sub-color filter to the thickness of the first sub-color filter disposed in the flat region and the bent region is set differently, the brightness of the light emitted in the front direction in the bent region can be increased.

[0014] According to an exemplary embodiment of the present disclosure, 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 bent region, the brightness of the light emitted in the front direction in the bent region can be increased.

[0015] The effects according to the present disclosure are not limited to the above-exemplified contents, and more different effects are included in this specification. Description of the Drawings

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

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

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

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

[0020] Figure 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 disclosure. In this case, Figure 4 corresponds to Figure 1 section I-I'.

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

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

[0023] Figure 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 disclosure. In this case, Figure 7 corresponds to Figure 1 section I-I' and section II-II'.

[0024] Figure 8 is a graph showing the change in the luminance of a first light-emitting region and a second light-emitting region included in a display device according to another exemplary embodiment of the present disclosure according to the viewing angle.

[0025] Figure 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 disclosure. In this case, Figure 9 corresponds to Figure 1 section II-II' and section III-III'.

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

[0027] Throughout the drawings and the detailed description, unless otherwise described, the same reference numerals should be understood to refer to the same elements, features, and structures. For clarity, illustration, and convenience, the relative sizes and descriptions of these elements may be exaggerated. Detailed Description

[0028] The advantages, features, and their implementation methods of the present disclosure will be clarified by the following exemplary embodiments described with reference to the drawings. However, the present disclosure may be implemented in different forms and should not be construed as limited to the exemplary embodiments set forth herein. On the contrary, these exemplary embodiments are provided to make the present disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. In addition, the present disclosure is only defined by the scope of the claims.

[0029] The shapes, sizes, areas, ratios, angles, and quantities disclosed in the drawings for describing the exemplary embodiments of the present disclosure are only examples, and thus the present disclosure is not limited to the details shown. Like reference numerals throughout the text denote like elements. In the following description, when a detailed description of a relevant known function or configuration is not necessary to obscure the gist of the present disclosure, that detailed description will be omitted.

[0030] When using "comprising", "having", "including", "containing", "constituting", "made of", "formed by", "composed of" as described in this specification, unless "only" is used, another component may also be present. Unless otherwise stated, terms in the singular form may include the plural form.

[0031] When interpreting an element, the element will also be interpreted to include an error range even though it is not explicitly described.

[0032] When describing a positional relationship, for example, when the positional order is described as "on", "above", "over", "under", "below", "beside", "beneath", "near", "close to", "adjacent to", "on the side of", "proximate to", unless "exactly" or "directly" is used, the case where there is no contact therebetween may be included.

[0033] Spatial relative terms, such as "below", "beneath", "under", "lower", "above", "upper", etc., may be used in this text to describe the relationship of one element or feature to another element or feature as shown in the figures. It should be understood that, in addition to the orientation shown in the figures, spatial relative terms may also include different orientations of the element during use or operation. For example, if the element in the figure is inverted, the element described as "below" or "beneath" another element or feature will be oriented "above" the other element or feature. Thus, the exemplary term "below" can include both orientations of below and above. Similarly, the exemplary terms "above" or "over" can include both orientations of "above" and "below".

[0034] If it is mentioned that the first element is located "on" the second element, it does not mean that the first element is substantially above the second element in the figure. The upper and lower parts of the relevant object can change according to the orientation of the object. Thus, in the figure or in the actual configuration, the situation where the first element is located "on" the second element includes the situation where the first element is located "above" the second element and the situation where the first element is located "below" the second element.

[0035] When describing a time relationship, for example, when a time sequence is described as "after", "subsequently", "then", and "before", it may include discontinuous situations unless "exactly" or "directly" is used.

[0036] It should be understood that although terms such as "first", "second", "A", "B", "a", and "b" etc. may be used in this text to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first element may be called the second element, and similarly, the second element may be called the first element.

[0037] In addition, when describing the components of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used in this text. Each of these terms is not used to define the nature, order, or sequence of the corresponding component, but only to distinguish the corresponding component from other components. In the case where a certain structural element or layer is "connected", "coupled", "adhered", or "joined" to another structural element or layer, it is generally interpreted that the other structural element or layer can be "connected", "coupled", "adhered", or "joined" to the structural element or layer directly or indirectly.

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

[0039] As used herein, the term "device" may refer to a display device including a display panel and a driver for driving the display panel. Examples of the display device may include light-emitting elements and the like. Additionally, examples of the device may include a laptop computer, a television, a computer monitor, an automotive device, a wearable device, and an automotive equipment device, and complete product or final product sets of electronic devices (or equipment) or sets of devices (or equipment) respectively including light-emitting elements and the like, such as mobile electronic devices such as smartphones or electronic tablets, but the embodiments of the present disclosure are not limited thereto.

[0040] The features of the various exemplary embodiments of the present disclosure may be partially or wholly coupled or combined with each other, and may interoperate with each other in various ways and be technically driven. The exemplary embodiments of the present disclosure 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 if they are shown in different drawings.

[0042] For ease of description, the dimensions and thicknesses of each component shown in the drawings are shown, and the present disclosure is not limited to the dimensions 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 one of ordinary skill in the art to which the exemplary embodiments belong. It will be further understood that terms, such as those defined in a commonly used dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the related art, and should not be interpreted in an idealized or overly formal sense, unless expressly so defined herein.

[0044] In the exemplary embodiments of the present disclosure, for ease of explanation, the source electrode and the drain electrode are distinguished from each other. However, the source electrode and the drain electrode may be used interchangeably. Thus, the source electrode may be the drain electrode, and the drain electrode may be the source electrode. In addition, the source electrode in any exemplary embodiment of the present disclosure may be the drain electrode in another exemplary embodiment of the present disclosure, and the drain electrode in any exemplary embodiment of the present disclosure may be the source electrode in another exemplary embodiment of the present disclosure.

[0045] In one or more exemplary embodiments of the present disclosure, for ease of explanation, 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 disclosure are not limited to this structure. For example, the source region may be the source electrode, and the drain region may be the drain electrode. Additionally, the source region may be the drain electrode, and the drain region may be the source electrode.

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

[0047] As can be seen from Figure 1 a display device according to an exemplary embodiment of the present disclosure 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 that is flatly arranged without bending. The flat area FA may include a first light-emitting area E1. A plurality of first light-emitting areas E1 are provided, and an image may be displayed when the plurality of 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), green (G), and blue (B) light, respectively. Alternatively, the plurality of first sub-pixels SP1 provided in the first light-emitting area E1 may emit red (R), green (G), blue (B), and white (W) light, respectively. Additionally, in Figure 1 only a state where the first light-emitting area E1 is composed of three first sub-pixels SP1 is shown, but the present disclosure 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), green (G), blue (B), and white (W) light. Additionally, the present disclosure is not limited thereto, and according to the technical level in the art, various numbers of first sub-pixels SP1 may emit light of different colors.

[0050] For example, the multiple sub-pixels SP may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the red sub-pixel, the green sub-pixel, and the blue sub-pixel may be set in a repeating manner. Alternatively, the multiple sub-pixels SP may include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, and the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel may be set in a repeating manner, or the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel may be set in a quadrilateral type. For example, the red sub-pixel, the blue sub-pixel, and the green sub-pixel may be sequentially set along the row direction, or the red sub-pixel, the blue sub-pixel, the green sub-pixel, and the white sub-pixel may be sequentially set along the row direction. However, in the embodiments of the present disclosure, the color type, the arrangement type, and the arrangement order of the sub-pixels are not limited, and may be configured in various forms according to the light-emitting characteristics, the device lifetime, and the device specifications.

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

[0052] The first bending region BA1 may be provided on one side (e.g., the right side) of the flat region FA. The first bending region BA1 may be a portion where bending occurs.

[0053] The first bending region BA1 may include a second light-emitting region E2 disposed relatively close to the flat region FA and a third light-emitting region E3 disposed relatively far from the flat region FA. For example, the second light-emitting region E2 is closer to the flat region FA than the third light-emitting region E3. Therefore, compared with the second light-emitting region E2, the third light-emitting region E3 is disposed outside the display device according to the exemplary embodiments of the present disclosure.

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

[0055] The second bending region BA2 may be provided on the other side (e.g., the left side) of the flat region FA. The second bending region BA2 may also include a plurality of light-emitting regions, and each of the plurality of light-emitting regions may include a plurality of sub-pixels. Since the detailed description related thereto is the same as the description of the first bending region BA1, its repeated description will be omitted.

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

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

[0058] The flat area FA may be maintained in a flat state alone without bending.

[0059] The first bending area BA1 may be bent at one end (e.g., the right end) of the flat area FA. Specifically, with respect to the boundary between the flat area FA and the first bending area BA1, one end (e.g., the right end) of the first bending area BA1 may be folded to the back surface of the display device. Similarly, the second bending area BA2 may be bent at the other end (e.g., the left end) of the flat area FA. Specifically, with respect to the boundary between the flat area FA and the second bending area BA2, one end (e.g., the left end) of the second bending area BA2 may be folded to the back surface of the display device. In addition, 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 be bent at the upper end of the flat area FA. Specifically, with respect to the boundary between the flat area FA and the first bending area BA1, the upper end of the first bending area BA1 may be folded to the back surface of the display device. Similarly, the second bending area BA2 may be bent at the lower end of the flat area FA. Specifically, with respect to the boundary between the flat area FA and the second bending area BA2, the lower end of the second bending area BA2 may be folded to the back surface of the display device, and it is not limited thereto.

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

[0061] As Figure 3 shown, a display device according to an exemplary embodiment of the present disclosure may include a flat area FA, a first bending area BA1, and a second bending area BA2. In this case, the angles of light emitted in the front direction of the display device in the flat area FA, the first bending area BA1, and the second bending area BA2 may be different. In this case, the front direction may be defined as the direction opposite to the back surface of the display device according to an exemplary embodiment of the present disclosure, and the front may be defined as the upper surface in the figure.

[0062] The angles of light emitted in the front direction in the flat area FA, the first bending area BA1, and the second bending area BA2 can be different, and the angles of light emitted in the front direction from the inside of the first bending area BA1 and the second bending area BA2 can be different from the angles of light emitted in the front direction from the outside of the first bending area BA1 and the second bending area BA2. For example, the inside of the first bending area BA1 and the second bending area BA2 refers to the part close to the flat area FA, and the outside of the first bending area BA1 and the second bending area BA2 refers to the part far from the flat area FA. For example, the angles of light emitted in the front direction from the part of the first bending area BA1 and the second bending area BA2 close to the flat area FA can be different from the angles of light emitted in the front direction from the part of the first bending area BA1 and the second bending area BA2 far from the flat area FA. For example, the angle of light emitted in the front direction from the part of the first bending area BA1 and the second bending area BA2 close to the flat area FA can be smaller than the angle of light emitted in the front direction from the part of the first bending area BA1 and the second bending area BA2 far from the flat area FA.

[0063] The light emitted in the front direction from the flat area FA can be emitted in the normal direction from the upper surface of the display device according to the present disclosure, and the light emitted in the front direction from the first bending area BA1 can be emitted while forming a predetermined angle with the normal of the upper surface of the display device. For example, the light emitted in the front direction from the pixels provided inside the first bending area BA1 can be emitted while forming a second angle θ2 with the normal of the upper surface of the display device, and the light emitted in the front direction from the pixels provided outside the first bending area BA1 can be emitted while forming a third angle θ3 with the normal of the upper surface of the display device. In this case, as the first bending area BA1 gradually moves outward, the angle formed by the normal of the upper surface of the display device and the front direction will increase. That is, the second angle θ2 can be formed to be smaller than the third angle θ3.

[0064] Figure 4 is a cross-sectional view of the first light-emitting area provided in the display device according to an exemplary embodiment of the present disclosure. In this case, Figure 4 corresponds to Figure 1 section I-I'.

[0065] As Figure 4 shown, the display device according to an exemplary embodiment of the present disclosure 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 bank 190, a first electrode 200, a light-emitting layer 210, a second electrode 220, a packaging layer 230, a black matrix 240, and a color filter layer CF1.

[0066] The substrate 100 may be formed of glass or plastic. In particular, the substrate 100 may be formed of a transparent plastic having flexible properties (e.g., polyimide (PI)). When polyimide is used as the substrate 100, a heat-resistant polyimide capable of withstanding high temperatures may be used in consideration of performing a high-temperature deposition process 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), polyethersulfone (PES), polyarylate (PAR), polysulfone (PSF), cycloolefin copolymer (COC), triacetyl cellulose (TAC), polyvinyl alcohol (PVA), and polystyrene (PS), and the present disclosure is not limited thereto. Although not shown in the figures, 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 may block air and moisture to protect the active layer 120. The buffer layer 110 may be made of an inorganic insulating material such as silicon oxide, silicon nitride, or a metal oxide. For example, the buffer layer 110 may be formed by a single-layer or multi-layer inorganic film. For example, the single-layer inorganic film may be a silicon oxide (SiOx) film or a silicon nitride (SiNx) film, and the multi-layer inorganic film may be formed by alternately laminating one or more layers of silicon oxide (SiOx) film, one or more layers of silicon nitride (SiNx) film, and one or more layers of amorphous silicon (a-Si), but is not limited thereto, and the buffer layer 110 may 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 (e.g., an oxide semiconductor, an amorphous semiconductor, or a polycrystalline semiconductor).

[0069] The oxide semiconductor material may have an excellent effect of preventing leakage current and relatively low manufacturing costs. The oxide semiconductor may be made of a metal oxide such as zinc (Zn), indium (In), gallium (Ga), tin (Sn), and titanium (Ti), or a combination of a metal such as zinc (Zn), indium (In), gallium (Ga), tin (Sn), or titanium (Ti) and its oxide. Specifically, the oxide semiconductor may 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 is not limited thereto.

[0070] Polycrystalline semiconductor materials have fast carrier mobilities such as electrons and holes, and thus have high mobilities, low power consumption, and excellent reliability. The polycrystalline semiconductor can be made of polysilicon (poly-Si), but is not limited thereto.

[0071] Amorphous semiconductor materials can be made of amorphous silicon (a-Si), but are not limited thereto.

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

[0073] The channel portion 121 overlaps with the gate electrode 140. By forming the channel portion 121 in this way, in the conductive process of making a part of the active layer 120 conductive, the channel portion 121 is protected by the gate electrode 140, so that the semiconductor characteristics can be maintained without conductivity.

[0074] The first connection portion 122 and the second connection portion 123 may have conductive characteristics through a conductive process of plasma-treating the semiconductor material using, for example, the gate electrode 140 as a mask. The first connection portion 122 and the second connection portion 123 through the conductive process have excellent conductive characteristics and can be used 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 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 by patterning a partial region of the gate insulating layer 130.

[0076] The gate insulating layer 130 may include a silicon nitride SiNx layer or a silicon oxide SiOx layer, but is not limited thereto. The gate insulating layer 130 may be formed 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 by a single layer or multiple layers of inorganic films. For example, the single layer of inorganic film may be a silicon oxide (SiOx) film or a silicon nitride (SiNx) film, and the multiple layers of inorganic films may be formed by alternately laminating one or more layers of silicon oxide (SiOx) films, one or more layers of silicon nitride (SiNx) films, and one or more layers of amorphous silicon (a-Si), but the present disclosure is not limited thereto. In addition, the gate insulating layer 130 may be formed using an atomic layer deposition (ALD) method or a metal organic chemical vapor deposition (MOCVD) method, 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 conductive 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 formed 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 by a single layer or multiple layers of an inorganic film. For example, the single-layer inorganic film may be a silicon oxide (SiOx) film or a silicon nitride (SiNx) film, and the multiple-layer inorganic film may be formed by alternately laminating one or more layers of a silicon oxide (SiOx) film, one or more layers of a silicon nitride (SiNx) film, and one or more layers of amorphous silicon (a-Si), but the present disclosure is not limited thereto.

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

[0081] The source electrode 161 and the drain electrode 162 may be disposed 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 formed 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 formed of a material different from the gate electrode 140 and may be formed of a material according to the 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 flatten the upper surface of the planarization layer 170. The planarization layer 170 may be configured 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 to flatten the steps caused by the thin film transistor.

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

[0086] The planarization layer 170 may be formed of an organic insulating layer material. For example, the planarization layer 170 may be formed 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 may emit first-color light, and the first color may 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 the contact hole formed in the planarization layer 170. The first electrode 200 may serve as an anode.

[0089] The bank 190 may be formed on the first electrode 200. In this case, a partial region of the upper surface of the first electrode 200 that is not covered by the bank 190 and is exposed becomes a light-emitting region.

[0090] The bank 190 may be formed of an organic layer such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, etc.

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

[0092] Although not shown, spacers may be provided on the bank 190. The spacers may ensure a gap between the fine metal mask (FMM) and the first electrode 200 so that the FMM 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 a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer that are patterned for each pixel, or may include a white light-emitting layer connected to all pixels. When the light-emitting layer 210 is formed 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 a yellow-green light-emitting layer, and a charge generation layer disposed 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 of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL), but the present disclosure is not limited thereto.

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

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

[0096] Depending on the bottom-emitting type or top-emitting type of the display device, one of the first electrode 200 and the second electrode 220 may include a single layer or multiple layers of an opaque conductive material having a relatively high reflection efficiency, and 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 having a relatively low work function such as aluminum (Al), silver (Ag), copper (Cu), lead (Pb), molybdenum (Mo), titanium (Ti), and alloys thereof, and the present disclosure 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 encapsulation layer 230a to the third encapsulation layer 230c may be sequentially stacked on the second electrode 220. The first encapsulation layer 230a and the third encapsulation layer 230c may be formed of an inorganic film layer including an inorganic material, and the second encapsulation layer 230b may be formed of an organic film layer including an organic material.

[0099] The first encapsulation layer 230a may be formed at the lowermost end of the encapsulation layer 230 to contact the upper surface of the second electrode 220. The first encapsulation layer 230a may be formed 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 formed of a material such as an acrylic resin, an epoxy resin, a polyimide, a polyethylene PE, or a silicon oxycarbide SiOC.

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

[0102] In addition, the encapsulation layer is not limited to three layers. For example, it may include n layers (where n is an integer greater than 3) in which inorganic encapsulation layers and organic encapsulation layers are alternately stacked.

[0103] The black matrix 240 may be formed on the encapsulation layer 230. Specifically, the black matrix 240 may be formed to overlap with the bank 190 to prevent light emitted from the organic light-emitting element EL from being introduced into another adjacent sub-pixel. Accordingly, a problem in which different lights generated in adjacent sub-pixels are mixed can 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 allow light emitted from the organic light-emitting element EL provided in the first sub-pixel SP1 to pass through. Accordingly, the first color light emitted from the organic light-emitting element EL may pass through the first color filter layer CF1. For example, when the first color light is green (G), the first color filter layer CF1 may allow green (G) light to pass through, but is not limited thereto. For example, when the first color light is blue (B), the first color filter layer CF1 may allow blue (B) light to pass through. For example, when the first color light is red (R), the first color filter layer CF1 may allow red (R) light to pass through.

[0105] According to an exemplary embodiment of the present disclosure, 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 disposed on the encapsulation layer 230, and the second sub-color filter SF2 may be disposed on the first sub-color filter SF1. In addition, the present disclosure is not limited thereto, and the second sub-color filter SF2 may be disposed on the encapsulation layer 230, and the first sub-color filter SF1 may be disposed on the second sub-color filter SF2.

[0107] Through this formation method, 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 directed to the outside.

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

[0109] The first sub-color filter SF1 may have a maximum transmittance at a wavelength different from that of the second sub-color filter SF2. Specifically, the first sub-color filter SF1 may have a maximum transmittance at a first wavelength, and the second sub-color filter SF2 may have a 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 disclosure is not limited thereto.

[0110] According to an exemplary embodiment of the present disclosure, 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 increased.

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

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

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

[0114] In addition, as the viewing angle increases, the overall curve graph of the luminance varying according to the wavelength tends to shift to the left. For example, it can be seen that the curve graph at a viewing angle of 40° is relatively tilted to the left compared to that at a viewing angle of 0°. Therefore, when the viewing angle is 0°, it can be seen that the curve graph is relatively symmetric based on the peak wavelength λmax, but when the viewing angle is 40°, the curve graph is relatively tilted to the left based on the peak wavelength λmax. For example, the peak wavelength λmax tends to shift to the left at a viewing angle of 40° compared to that at a viewing angle of 0°.

[0115] In addition, the peak wavelength λmax varying according to the viewing angle tends to decrease as the viewing angle increases while moving to the left. That is, compared with the case where the viewing angle is 0°, at a viewing angle of 40°, the peak wavelength λmax decreases while moving to the left.

[0116] Next, as Figure 6 shown, compared with the first sub-color filter SF1, the second sub-color filter SF2 can transmit light in a relatively shorter wavelength band. For example, when the organic light-emitting element (see Figure 4 EL) emits green (G) light, the first sub-color filter SF1 can transmit light in the wavelength range of, for example, 500 nm to 650 nm, and the second sub-color filter SF2 can transmit light in the wavelength range of 400 nm to 580 nm.

[0117] In addition, the first sub-color filter SF1 can have a maximum transmittance at the first wavelength λ1, and the second sub-color filter SF2 can have a maximum transmittance at the second wavelength λ2. In this case, the first wavelength λ1 can be the peak wavelength of the light transmitted through the first sub-color filter SF1, and the second wavelength λ2 can be the peak wavelength of the light transmitted through the second sub-color filter SF2. According to an exemplary embodiment of the present disclosure, the lengths of the first wavelength λ1 and the second wavelength λ2 can be within a range of 50 nm from the length of the peak wavelength λmax of the light emitted by the organic light-emitting element (see Figure 4 EL). 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 Figure 4 EL), and the length of the first wavelength λ1 can be within a range of 50 nm from the length of the peak wavelength λmax of the light emitted by the organic light-emitting element (see Figure 4 EL), 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 Figure 4 EL), and the length of the second wavelength λ2 can be within a range of 50 nm from the length of the peak wavelength λmax of the light emitted by the organic light-emitting element (see Figure 4 EL). On the other hand, Figure 6 only shows the organic light-emitting element (seeFigure 4 the peak wavelength λmax of the light emitted by the EL), but is not limited thereto. For example, the organic light-emitting element (see Figure 4 the length of the peak wavelength λmax of the light emitted by the EL) is in the 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 disclosure is not limited thereto.

[0118] According to an exemplary embodiment of the present disclosure, the maximum transmittance at the second wavelength λ2 may be higher than the maximum transmittance at the first wavelength λ1. At the same time, the brightness of the light seen through the actual display device is proportional to the product of the brightness of the light emitted from the organic light-emitting element and the transmittance of the color filter layer. Therefore, since the transmittance of the second sub-color filter SF2 having the maximum transmittance at the second wavelength λ2 is higher than the transmittance of the first sub-color filter SF1 having the maximum transmittance at the first wavelength λ1, the brightness of the light propagating at the first angle θ1 can be increased. As a result, according to an exemplary embodiment of the present disclosure, the brightness of the light (e.g., the light propagating at the first angle θ1) perceived on the side surface of the flat area (see Figure 3 in the FA) of the display device can be improved.

[0119] Referring again to Figure 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 disclosure, 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 can be adjusted to increase the brightness of the light emitted at the first angle θ1. In addition, a more detailed description will be given with reference to Figure 7 and Figure 10 thereof.

[0120] Figure 7 is a cross-sectional view of the first light-emitting region and the second light-emitting region provided in a display device according to another exemplary embodiment of the present disclosure. In this case, Figure 7 corresponds to Figure 1 the cross-sections I-I' and II-II'. In addition, in the exemplary embodiment of Figure 7 , except for the configurations 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 Figure 4 , and the second sub-pixel is the same as the second sub-pixel of Figure 4 , so the different configurations will be mainly described below.

[0121] As Figure 7As shown, the display device according to an example embodiment of the present disclosure 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 arranged in the first sub-pixel SP1, and a second color filter layer CF2 arranged in the second sub-pixel SP2.

[0122] According to an exemplary embodiment of the present disclosure, the second sub-pixel SP2 corresponds to Figure 3 The first bending region (see Figure 3 The second sub-pixel SP2 is arranged in the first bending area with curvature (see Figure 3 Therefore, light emitted from the organic light emitting element EL disposed in the second subpixel SP2 toward the front surface of the display device according to the exemplary embodiment of the present disclosure is emitted while forming a second angle θ2 with the normal to the upper surface of the organic light emitting element EL.

[0123] Unlike 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 allow light emitted from the organic light emitting element EL disposed in the second sub-pixel SP2 to pass through. Therefore, the first color light emitted by the organic light emitting element EL may pass through the second color filter layer CF2. For example, when the first color light is green (G), the second color filter layer CF2 may allow green (G) light to pass through, but is not limited thereto. For example, when the first color light is blue (B), the second color filter layer CF2 may allow blue (B) light to pass through. For example, when the first color light is red (R), the second color filter layer CF2 may allow red (R) light to pass through.

[0125] According to example embodiments of the present disclosure, the second color filter layer CF2 may include third and fourth sub-color filters SF3 and 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 disposed on the encapsulation layer 230, and the fourth sub-color filter SF4 may be disposed on the third sub-color filter SF3. Meanwhile, the present disclosure is not limited thereto, and the fourth sub-color filter SF4 may be disposed on the encapsulation layer 230, and the third sub-color filter SF3 may be disposed on the fourth sub-color filter SF4.

[0127] In addition, 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, thereby shortening the manufacturing time and cost. However, the present disclosure 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 shortened.

[0128] The light emitted from the organic light-emitting element EL is directed 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 can transmit light having different wavelength ranges. For example, the third sub-color filter SF3 can transmit light having a wavelength range of 500 nm to 650 nm, and the fourth sub-color filter SF4 can transmit light having a wavelength range of 400 nm to 580 nm. In addition, except for the thickness, the third sub-color filter SF3 is the same as the first sub-color filter SF1, and except for the thickness, the fourth sub-color filter SF4 is the same as the second sub-color filter SF2, and thus their repeated descriptions will be omitted.

[0130] The third sub-color filter SF3 can have a maximum transmittance at a wavelength different from that of the fourth sub-color filter SF4. Specifically, the third sub-color filter SF3 can have a maximum transmittance at a third wavelength, and the fourth sub-color filter SF4 can have a maximum transmittance at a fourth wavelength. In this case, the third wavelength of the third sub-color filter SF3 can 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 can 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 disclosure, 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 to the outside, the brightness of the light viewed from the second viewing 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 disclosure, by adjusting 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, the luminance of the light emitted at the second angle θ2 can be optimized to increase the luminance.

[0133] According to an exemplary embodiment of the present disclosure, the first color filter layer CF1 disposed in the first sub-pixel SP1 and the second color filter layer CF2 disposed in the second sub-pixel SP2 may be stacked in different thickness ratios. Specifically, the ratio of the thickness of the first sub-color filter SF1 to the thickness of the second sub-color filter SF2 disposed in the first color filter layer CF1 and the ratio of the thickness of the third sub-color filter SF3 to the thickness of the fourth sub-color filter SF4 disposed in the second color filter layer CF2 may be different from each other.

[0134] According to an exemplary embodiment of the present disclosure, the ratio of the thickness of the second sub-color filter SF2 to the thickness of the first sub-color filter SF1 may be set to be less than the ratio of the thickness of the fourth sub-color filter SF4 to the thickness of the third sub-color filter SF3. As a result, the ratio of the light having a relatively short wavelength passing through the fourth sub-color filter SF4 in the second sub-pixel SP2 may be higher than the ratio of the light having a relatively short wavelength passing through the second sub-color filter SF2 in the first sub-pixel SP1.

[0135] Through this formation method, the light emitted from the organic light-emitting element EL of the second sub-pixel SP2 can better pass through the light having a relatively short wavelength, thereby increasing the luminance of the light emitted at the second angle θ2.

[0136] In addition, Figure 7 Only the 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 is shown, but the present disclosure 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 the above formation method, the luminance of the light guided to the front of the display device in the first bending region (see Figure 3 BA1 in) or the second bending region (see Figure 3 BA2 in) can be increased.

[0137] Figure 8 is a graph showing that the brightness of the first light-emitting region and the second light-emitting region included in a display device according to another exemplary embodiment of the present disclosure varies according to the viewing angle. 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 Figure 7 exemplary embodiment, and c relates to the second sub-pixel SP2 according to the Figure 7 exemplary embodiment. In addition, 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] It can be seen from a, b, and c that, compared with the comparative example that does not transmit light in the relatively short wavelength band, b and c transmit light in the relatively short wavelength band, and thus it can be seen that the brightness of b and c that varies according to the viewing angle is relatively higher than a.

[0139] In addition, 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 the relatively short wavelength band can be further transmitted to ensure relatively higher brightness than b even at a large viewing angle.

[0140] Figure 9 is a cross-sectional view of the second light-emitting region and the third light-emitting region provided in a display device according to another exemplary embodiment of the present disclosure. In this case, Figure 9 corresponds to Figure 1 cross-sections II-II' and III-III'. In addition, in the Figure 9 exemplary embodiment, except for the configurations 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 Figure 7 and the third sub-pixel is the same as the second sub-pixel of Figure 7 , so the different configurations will be mainly described below.

[0141] As Figure 9 shown, a display device according to an exemplary embodiment of the present disclosure 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 bank 190, a first electrode 200, a light-emitting layer 210, a second electrode 220, a packaging 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 disclosure, the third sub-pixel SP3 corresponds to Figure 3 any one of the sub-pixels provided in the first bending region (see Figure 3 BA1). In the first bending region (see Figure 3 BA1), more third sub-pixels SP3 are provided outside the display device than second sub-pixels SP2. For example, the third sub-pixel SP3 is farther from the flat region FA of the display device than the second sub-pixel SP2. Therefore, the light emitted from the organic light-emitting element EL provided in the third sub-pixel SP3 is emitted while forming a third angle θ3 with the normal to the upper surface of the organic light-emitting element EL toward the front of the display device according to an exemplary embodiment of the present disclosure. 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 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 allow the light emitted from the organic light-emitting element EL provided in the third sub-pixel SP3 to pass through. 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 allow green (G) light to pass through, but is not limited thereto. For example, when the first color light is blue (B), the third color filter layer CF3 may allow blue (B) light to pass through. For example, when the first color light is red (R), the third color filter layer CF3 may allow red (R) light to pass through.

[0145] According to an exemplary embodiment of the present disclosure, 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. In addition, the present disclosure is not limited thereto, and the sixth sub-color filter SF6 may be provided on the encapsulation layer 230, while the fifth sub-color filter SF5 may be provided on the sixth sub-color filter SF6.

[0147] Through this formation method, the light emitted from the organic light-emitting element EL may 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 can transmit light in different wavelength ranges. For example, the fifth sub-color filter SF5 can transmit light in the wavelength range of 500 nm to 650 nm, and the sixth sub-color filter SF6 can transmit light in the wavelength range of 400 nm to 580 nm. In addition, except for the thickness, the fifth sub-color filter SF5 is the same as the third sub-color filter SF3, and except for the thickness, the sixth sub-color filter SF6 is the same as the fourth sub-color filter SF4, so their repeated descriptions will be omitted.

[0149] The fifth sub-color filter SF5 can have a maximum transmittance at a wavelength different from that of the sixth sub-color filter SF6. Specifically, the fifth sub-color filter SF5 can have a maximum transmittance at a fifth wavelength, and the sixth sub-color filter SF6 can have a maximum transmittance at a sixth wavelength. In this case, the fifth wavelength of the fifth sub-color filter SF5 can 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 can 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 disclosure, 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 to the outside, the brightness of the light viewed from the third angle θ3 can be increased.

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

[0152] According to an exemplary embodiment of the present disclosure, the second color filter layer CF2 provided in the second sub-pixel SP2 and the third color filter layer CF3 provided in the third sub-pixel SP3 can be stacked in different thickness ratios. Specifically, the ratio of the thickness of the third sub-color filter SF3 to the thickness of the fourth sub-color filter SF4 provided in the second color filter layer CF2 and the ratio of the thickness of the fifth sub-color filter SF5 to the thickness of the sixth sub-color filter SF6 provided in the third color filter layer CF3 can be different from each other.

[0153] According to an exemplary embodiment of the present disclosure, the ratio of the thickness of the fourth sub-color filter SF4 to the thickness of the third sub-color filter SF3 may be less than the ratio of the thickness of the sixth sub-color filter SF6 to the thickness of the fifth sub-color filter SF5. As a result, the ratio of light having a relatively short wavelength that is allowed to pass through the sixth sub-color filter SF6 in the third sub-pixel SP3 may be higher than the ratio of light having a relatively short wavelength that is allowed to pass through the fourth sub-color filter SF4 in the second sub-pixel SP2.

[0154] With this formation, light emitted from the organic light-emitting element EL of the third sub-pixel SP3 can better pass through light having a relatively short wavelength, thereby increasing the brightness of the light emitted at the third angle θ3.

[0155] In addition, although the first sub-pixel SP1 provided in the flat area FA is not specifically shown in Figure 9 , in another example, as shown in Figure 4 , the first sub-pixel SP1 provided in the flat area FA may include a first sub-color filter SF1 and a second sub-color filter SF2. In addition, in another example, the first sub-pixel SP1 may include only one layer of the first sub-color filter SF1, and the present disclosure is not limited thereto.

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

[0157] Table 1 below relates to measuring the brightness of the light emitted at 40° by adjusting the thickness ratio of the first sub-color filter SF1 and the second sub-color filter SF2 in the comparative example and Examples 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 Examples 1 to 3 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, respectively, and are set by differently adjusting the thickness ratio of the first sub-color filter SF1 to the second sub-color filter SF2.

[0158]

Table 1

[0159] Thickness ratio (SF1:SF2) Luminance (@40°, %) Comparative example - 34％ Example 1 1:1 36％ Example 2 3:7 38％ Example 3 1:9 40％

[0160] Referring to Figure 10 and Table 1, first, it can be seen by comparing the comparative example with 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, it can be seen that in the case of Examples 1 to 3, the brightness is increased compared to the comparative example in which only the first sub-color filter SF1 is provided.

[0161] In addition, with reference 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 relatively increases. As a result, it can be confirmed that the measured luminance at 40° increases as the ratio of the thickness of the second sub-color filter SF2 to the thickness of the first sub-color filter SF1 increases.

[0162] Therefore, the present disclosure can have the following advantages.

[0163] According to an exemplary embodiment of the present disclosure, by providing a first sub-color filter and a second sub-color filter that are formed to overlap each other and transmit light having different peak wavelengths, the luminance of light emitted in the lateral direction of the display device can be increased.

[0164] According to an exemplary embodiment of the present disclosure, 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 region and the bent region is set differently, the luminance of light emitted in the front direction in the bent region can be increased.

[0165] According to an exemplary embodiment of the present disclosure, 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 bent region, the luminance of light emitted in the front direction in the bent region can be increased.

[0166] The exemplary embodiments of the present disclosure can also be described as follows:

[0167] According to an exemplary embodiment of the present disclosure, there is provided a display device including: a substrate; a light-emitting layer disposed on the substrate and emitting first-color light; 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 shorter than the first peak wavelength, and the first color filter and the second color filter overlap each other.

[0168] The color filter layer is disposed in a flat region of the substrate.

[0169] The color filter layer is disposed in a bent region of the substrate.

[0170] The maximum transmittance of the second color filter is greater than the maximum transmittance of the first color filter.

[0171] 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 greater.

[0172] 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 from 1:1 to 1:9.

[0173] The first color filter and the second color filter allow light having a first color to pass therethrough.

[0174] 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 a range of 50 nm.

[0175] 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 a range of 50 nm.

[0176] The light emitting layer emits any one of red light, green light, and blue light.

[0177] According to an exemplary embodiment of the present disclosure, a display device is provided. The display device includes: a substrate including a flat area and a bent area provided on one side of the flat area, wherein a first light emitting area is provided in the flat area and a second light emitting area is provided in the bent area, wherein the first light emitting area includes a first light emitting layer and a first color filter layer provided on the first light emitting layer, and the second light emitting area includes a second light emitting layer and a second color filter layer provided 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 shorter than the third peak wavelength, and the third sub-color filter and the fourth sub-color filter overlap each other.

[0178] The first color filter layer includes one layer, and wherein the second color filter layer includes two layers of the third sub-color filter and the fourth sub-color filter.

[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 fourth thickness to the third thickness is 1 or greater.

[0180] 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 from 1:1 to 1:9.

[0181] 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 a range of 50 nm.

[0182] The fourth peak wavelength of the fourth sub-color filter is less 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.

[0183] The first color filter layer includes a first sub-color filter having a maximum transmittance at a first peak wavelength and a second sub-color filter having a maximum transmittance at a second peak wavelength, and the first sub-color filter and the second sub-color filter overlap each other.

[0184] The first sub-color filter is disposed below the second sub-color filter, and the third sub-color filter is disposed below the fourth sub-color filter.

[0185] Each of the first sub-color filter, the second sub-color filter, the third sub-color filter, and the fourth sub-color filter includes a first thickness, a second thickness, a third thickness, and a fourth thickness, respectively, and 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.

[0186] The maximum transmittance of the second sub-color filter is greater than the maximum transmittance of the first sub-color filter, and the maximum transmittance of the fourth sub-color filter is greater than the maximum transmittance of the third sub-color filter.

[0187] The display device further includes: a third light-emitting region disposed in the bending region and outside the second light-emitting region, wherein the third light-emitting region includes 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 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.

[0188] Each of the third sub-color filter, the fourth sub-color filter, the fifth sub-color filter, and the sixth sub-color filter has a third thickness, a fourth thickness, a fifth thickness, or 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 less than the ratio of the sixth thickness of the sixth sub-color filter to the fifth thickness of the fifth sub-color filter.

[0189] The maximum transmittance of the fourth sub-color filter is greater than the maximum transmittance of the third sub-color filter, and the maximum transmittance of the sixth sub-color filter is greater than the maximum transmittance of the fifth sub-color filter.

[0190] The display device further includes: a third light-emitting region, which is disposed in the bending region and outside the second light-emitting region, wherein the third light-emitting region includes a third light-emitting layer and a third color filter layer disposed 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.

[0191] Each of the third sub-color filter, the fourth sub-color filter, the fifth sub-color filter, and the sixth sub-color filter includes a third thickness, a fourth thickness, a fifth thickness, and a sixth thickness, respectively, 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.

[0192] The maximum transmittance of the fourth sub-color filter is greater than the maximum transmittance of the third sub-color filter, and the maximum transmittance of the sixth sub-color filter is greater than the maximum transmittance of the fifth sub-color filter.

[0193] It will be apparent to those skilled in the art that various substitutions, modifications, and variations can be made within the scope of the present disclosure without departing from the spirit and scope of the present disclosure. Therefore, the scope of the present disclosure is represented by the claims, and all changes or modifications derived from the meaning, scope, and equivalent concepts of the claims should be construed as being included within the scope of the present disclosure.

[0194] Cross-reference to related applications

[0195] This application claims the priority of Korean Patent Application No. 10-2023-0181642, filed with the Korean Intellectual Property Office on December 14, 2023, the entire contents of which are hereby incorporated by reference herein for all purposes.

Claims

1. A display device, comprising: substrate; a light-emitting layer disposed on the substrate and emitting light of a first color; as well as a color filter layer, the color filter layer being disposed on the light emitting layer, The color filter layer includes a first color filter having a maximum transmittance at a first peak wavelength and a second color filter having a maximum transmittance at a second peak wavelength shorter than the first peak wavelength, and the first color filter and the second color filter overlap each other.

2. The display device according to claim 1, wherein: The color filter layer is disposed in a planar region of the substrate.

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

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

5. The display device according to claim 1, in, The first color filter has a first thickness, and the second color filter has a second thickness, and A ratio of the second thickness to the first thickness is 1 or greater.

6. The display device according to claim 1, in, The first color filter has a first thickness, and the second color filter has a second thickness, and A ratio of the first thickness to the second thickness is in a range from 1:1 to 1:

9.

7. The display device according to claim 1, wherein: The first color filter and the second color filter allow light having a first color to pass therethrough.

8. The display device according to claim 1, wherein: A first peak wavelength of the first color filter is greater than a peak wavelength of the light emitting layer, and a difference between the first peak wavelength and the peak wavelength is within 50 nm.

9. The display device according to claim 1, in, A second peak wavelength of the second color filter is smaller than a peak wavelength of the light emitting layer, and a difference between the second peak wavelength and the peak wavelength is within 50 nm.

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

11. A display device, comprising: A substrate, the substrate comprising a flat region and a bent region arranged on one side of the flat region, wherein a first light emitting region is arranged in the flat region and a second light emitting region is arranged in the bent region, 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 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 shorter than the third peak wavelength, and the third sub-color filter and the fourth sub-color filter overlap each other.

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

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

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

9.

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

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

17. The display device according to claim 11, in, The first color filter layer includes a first sub-color filter having a maximum transmittance at a first peak wavelength and a second sub-color filter having a maximum transmittance at a second peak wavelength, and the first sub-color filter and the second sub-color filter overlap each other.

18. The display device according to claim 17, in, The first sub-color filter is disposed below the second sub-color filter, and Wherein, the third sub-color filter is arranged below the fourth sub-color filter.

19. The display device according to claim 17, in, The first sub-color filter, the second sub-color filter, the third sub-color filter, and the fourth sub-color filter include a first thickness, a second thickness, a third thickness, and a fourth thickness, respectively, 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.

20. The display device according to claim 17, in, 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.

21. The display device according to claim 17, further comprising: a third light emitting region, the third light emitting region being arranged in the bending region and outside the second light emitting region, The third light-emitting region includes a third light-emitting layer and a third color filter layer disposed on the third light-emitting layer, and 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.

22. The display device according to claim 21, in, The third sub-color filter, the fourth sub-color filter, the fifth sub-color filter, and the sixth sub-color filter have a third thickness, a fourth thickness, a fifth thickness, or 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.

23. The display device according to claim 21, in, The maximum transmittance of the fourth sub-color filter is greater than the maximum transmittance of the third sub-color filter, and A maximum transmittance of the sixth sub-color filter is greater than a maximum transmittance of the fifth sub-color filter.

24. The display device according to claim 11, further comprising: a third light emitting region, the third light emitting region being arranged in the bending region and outside the second light emitting region, The third light-emitting region includes a third light-emitting layer and a third color filter layer disposed on the third light-emitting layer, and 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.

25. The display device according to claim 24, in, The third sub-color filter, the fourth sub-color filter, the fifth sub-color filter, and the sixth sub-color filter include 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.

26. The display device according to claim 24, in, The maximum transmittance of the fourth sub-color filter is greater than the maximum transmittance of the third sub-color filter, and Wherein, the maximum transmittance of the sixth sub-color filter is greater than the maximum transmittance of the fifth sub-color filter.

Images