Display device

Abstract

A display device includes: a substrate including a substantially flat region and an arc-shaped region extending from the substantially flat region; a first pixel electrode arranged in the arc-shaped region; a first emission layer arranged on the first pixel electrode; a second pixel electrode arranged in the substantially flat region; a second emission layer arranged on the second pixel electrode; a first functional layer having a first thickness arranged between the first pixel electrode and the first emission layer; and a second functional layer having a second thickness arranged between the second pixel electrode and the second emission layer. The first thickness is greater than the second thickness.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0166000, filed on December 12, 2019, which is hereby incorporated by reference for all purposes as if fully set forth herein. Technical Field

[0003] Exemplary embodiments of the present invention relate generally to display devices, and more particularly, to a display device with a curved display area having an improved viewing angle. Background Art

[0004] The display device visually displays an image. Generally, the display device is used as a display of a small product such as a cellular phone or a display of a large product such as a television.

[0005] Among the types of display devices, there are flexible display devices having flexible materials, including curved display devices that can maintain display performance even when a display panel is bent to form a curved region and / or a curved region.

[0006] In recent years, as interest in flexible display devices has increased, active research thereon has been conducted, and in this regard, various attempts have been made to minimize a viewing angle difference due to bending of a display panel.

[0007] The above information disclosed in this Background section is only for understanding the background of the inventive concept and therefore it may contain information that does not constitute prior art. Summary of the invention

[0008] A display device having a display panel with a curved area constructed according to the principles and exemplary embodiments of the present invention expresses colors with improved reliability. The display device can improve and / or reduce the difference in color perceived according to the viewing angle of the curved display area. For example, the thickness of at least one layer of pixels in the curved area can be adjusted to reduce the difference in color.

[0009] Additional features of the inventive concept will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the inventive concept.

[0010] According to one aspect of the present invention, a display device includes: a substrate including a substantially flat region and an arc-shaped region extending from the substantially flat region; a first pixel electrode arranged in the arc-shaped region; a first emission layer arranged on the first pixel electrode; a second pixel electrode arranged in the substantially flat region; a second emission layer arranged on the second pixel electrode; a first functional layer having a first thickness arranged between the first pixel electrode and the first emission layer; and a second functional layer having a second thickness arranged between the second pixel electrode and the second emission layer. The first thickness is greater than the second thickness.

[0011] The first thickness may vary according to an angle between an imaginary line parallel to the upper surface of the substantially flat region and a tangent line at a point on the upper surface of the arc-shaped region.

[0012] The first thickness may increase as the angle increases.

[0013] The display device further includes: a third pixel electrode arranged in the arc-shaped area; a third emission layer disposed on the third pixel electrode; and a third functional layer having a third thickness disposed between the third pixel electrode and the third emission layer. The third pixel electrode may be spaced farther from the substantially flat area than the first pixel electrode, and the third thickness may be greater than the first thickness.

[0014] The display device may further include: a first auxiliary layer having a first auxiliary thickness disposed between the first functional layer and the first emission layer; and a third auxiliary layer having a third auxiliary thickness disposed between the third functional layer and the third emission layer. The third auxiliary thickness may be smaller than the first auxiliary thickness.

[0015] The display device may further include: a first auxiliary layer having a first auxiliary thickness disposed between the first functional layer and the first emission layer; and a second auxiliary layer having a second auxiliary thickness disposed between the second functional layer and the second emission layer. The first auxiliary thickness may be smaller than the second auxiliary thickness.

[0016] The first auxiliary thickness may vary according to an angle between an imaginary line parallel to the upper surface of the substantially flat region and a tangent line at a point on the upper surface of the arc-shaped region.

[0017] The first auxiliary thickness may decrease as the angle increases.

[0018] The first functional layer and the second functional layer may be integrally formed.

[0019] The first functional layer and the second functional layer may include a hole injection layer.

[0020] According to another aspect of the present invention, a display device includes: a substrate including a substantially flat region and an arc region extending from the substantially flat region; a first pixel electrode arranged in the arc region; a first emission layer overlapping the first pixel electrode; a second pixel electrode arranged in the substantially flat region; a second emission layer overlapping the second pixel electrode; a first functional layer disposed between the first pixel electrode and the first emission layer; a second functional layer disposed between the second pixel electrode and the second emission layer; a first auxiliary layer having a first thickness disposed between the first functional layer and the first emission layer; and a second auxiliary layer having a second thickness disposed between the second functional layer and the second emission layer. The first emission layer and the second emission layer are configured to emit light of a first color, and the first thickness is less than the second thickness.

[0021] The display device may further include: a third pixel electrode arranged in the arc region; a third emission layer overlapping the third pixel electrode; a fourth pixel electrode arranged in a substantially flat region; a fourth emission layer overlapping the fourth pixel electrode; a third functional layer disposed between the third pixel electrode and the third emission layer; a fourth functional layer disposed between the fourth pixel electrode and the fourth emission layer; a third auxiliary layer having a third thickness disposed between the third functional layer and the third emission layer; and a fourth auxiliary layer having a fourth thickness disposed between the fourth functional layer and the fourth emission layer. The third emission layer and the fourth emission layer may be configured to emit light of a second color different from the first color, and the third thickness may be less than the fourth thickness.

[0022] The first thickness may vary according to an angle between an imaginary line parallel to the upper surface of the substantially flat region and a tangent line at a point on the upper surface of the arc-shaped region.

[0023] The first thickness may decrease as the angle increases.

[0024] The first thickness may be smaller than the third thickness.

[0025] The first color of light may have a green wavelength, and the second color of light may have a red wavelength.

[0026] The display device may further include: a third pixel electrode arranged in the arc-shaped area; a third emission layer corresponding to the third pixel electrode; a third functional layer disposed between the third pixel electrode and the third emission layer; and a third auxiliary layer having a third thickness disposed between the third functional layer and the third emission layer. The third emission layer may be configured to emit light of the first color, the third pixel electrode may be spaced farther from the substantially flat area than the first pixel electrode, and the third thickness may be less than the first thickness.

[0027] The first auxiliary layer and the second auxiliary layer may be separated from each other.

[0028] The first functional layer and the second functional layer may be integrally formed.

[0029] According to another aspect of the present invention, a display device includes: a substrate including a substantially flat region and an arc-shaped region extending from the substantially flat region; a first pixel electrode arranged in the arc-shaped region; a first emission layer overlapping the first pixel electrode; a second pixel electrode arranged in the substantially flat region; a second emission layer overlapping the second pixel electrode; a first functional layer disposed between the first pixel electrode and the first emission layer; and a second functional layer disposed between the second pixel electrode and the second emission layer. The first emission layer and the second emission layer are configured to emit light of the same color, and the first functional layer and the second functional layer have different thicknesses.

[0030] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the inventive concept.

[0032] Figure 1 is a schematic perspective view of an exemplary embodiment of a display device constructed according to the principles of the present invention.

[0033] Figure 2 It is along Figure 1 Schematic cross-sectional view taken along line II-II'.

[0034] Figure 3 yes Figure 2 An enlarged view of part VI.

[0035] Figure 4 yes Figure 2 1 is an equivalent circuit diagram of an exemplary embodiment of a representative pixel of a display panel of FIG. 1 .

[0036] Figure 5 yes Figure 2 A plan view of an exemplary embodiment of a display panel.

[0037] Figure 6 It is along Figure 5 Schematic cross-sectional views taken along line III-III' and line IV-IV' of FIG. 1 illustrate exemplary embodiments of a display panel.

[0038] Figure 7 yes Figure 5A plan view of a display panel illustrating a curved region having multiple arc-shaped regions.

[0039] Fig. 8A It is along Figure 7 A schematic cross-sectional view taken along line VV' of FIG. 1 illustrates another exemplary embodiment of a display panel.

[0040] Figure 8B It is schematically explained Fig. 8A A diagram showing a comparison of the thicknesses of certain layers of a display element.

[0041] Fig. 9A It is along Figure 5 Schematic cross-sectional views taken along line III-III' and line IV-IV' of FIG. 1 illustrate yet another exemplary embodiment of a display panel.

[0042] Fig. 9B is a schematic illustration of the emission of light of different colors from each other. Fig. 9A A diagram showing a comparison of the thicknesses of some of the layers of the display elements.

[0043] Fig. 9C is a schematic diagram illustrating the arrangement of the curved area and the non-curved area. Fig. 9A A diagram showing a comparison of the thicknesses of some of the layers of the display elements.

[0044] Fig.9D is a schematic diagram illustrating the arrangement of the curved area and the non-curved area. Fig. 9A A diagram comparing the thickness of the layers of other display elements.

[0045] Fig. 10A It is along Figure 7 A schematic cross-sectional view taken along line VV' of FIG. 1 illustrates yet another exemplary embodiment of a display panel.

[0046] Fig. 10B It is schematically explained Fig. 10A A diagram showing a comparison of the thicknesses of certain layers of a display element.

[0047] Fig.11 It is a chromaticity graph.

[0048] Fig.12 It is along Figure 5 Schematic cross-sectional views taken along lines III-III' and IV-IV' of FIG. 1 illustrate still another exemplary embodiment of a display panel. DETAILED DESCRIPTION

[0049] In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of various exemplary embodiments or implementations of the present invention. As used herein, "implementation" and "implementation" are interchangeable words, which are non-limiting examples of devices or methods using one or more inventive concepts disclosed herein. However, it is apparent that various exemplary embodiments can be practiced without these specific details or with one or more equivalent arrangements. In other cases, well-known structures and devices are shown in block diagram form to avoid unnecessary confusion of various exemplary embodiments. In addition, various exemplary embodiments may be different, but do not have to be exclusive. For example, without departing from the inventive concept, the specific shape, configuration and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0050] Unless otherwise indicated, the illustrated exemplary embodiments are to be understood as providing exemplary features of the details of variations in which some of the inventive concepts may be implemented in practice. Therefore, unless otherwise indicated, the features, components, modules, layers, films, panels, regions and / or aspects, etc. (hereinafter referred to as "elements" individually or collectively) of the various embodiments may be combined, separated, interchanged and / or rearranged in other ways without departing from the inventive concept.

[0051] The use of cross hatching and / or shading in the accompanying drawings is generally provided to clarify the boundaries between adjacent elements. Thus, unless otherwise indicated, the presence or absence of cross hatching or shading does not convey or indicate a preference or requirement for a specific material, material property, size, ratio, commonality between the illustrated elements and / or any other characteristics, attributes, properties, etc. of the elements. In addition, in the accompanying drawings, the size and relative size of the elements may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, a specific process sequence may be performed differently from the described sequence. For example, two processes described in succession may be performed substantially simultaneously or in an order opposite to the described sequence. Moreover, the same reference numerals represent the same elements.

[0052] When an element, such as a layer, is referred to as being "on", "connected to" or "coupled to" another element or layer, it can be directly on, connected to or coupled to another element or layer, or there can be an intermediate element or layer. However, when an element or layer is referred to as being "directly" "on", "directly connected to" or "directly coupled to" another element or layer, there is no intermediate element or layer. For this purpose, the term "connection" can refer to physical connection, electrical connection and / or fluid connection with or without an intermediate element. In addition, the D1 axis, the D2 axis and the D3 axis are not limited to the three axes (such as the x-axis, the y-axis and the z-axis) of a rectangular coordinate system, and can be interpreted in a broader sense. For example, the D1 axis, the D2 axis and the D3 axis can be perpendicular to each other, or different directions that are not perpendicular to each other can be represented. For the purpose of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as, for example, XYZ, XYY, YZ, and ZZ. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0053] Although the terms "first", "second", etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element. Therefore, without departing from the teachings of the present disclosure, the first element discussed below may be referred to as the second element.

[0054] Spatially relative terms, such as "below," "beneath," "below," "above," "upper," "above," "higher," and "side" (e.g., as in "sidewall"), etc., may be used herein for descriptive purposes and, thereby, to describe the relationship of one element to another element(s) illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture other than the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is flipped, elements described as being "below" or "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both above and below orientations. In addition, the device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and, as such, the spatially relative descriptors used herein are interpreted accordingly.

[0055] The terms used herein are for the purpose of describing specific embodiments and are not intended to be limiting. As used herein, the singular forms "a", "an", and "said" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, the terms "comprises", "comprising", "includes", and / or "including" when used in this specification indicate the presence of stated features, integers, steps, operations, elements, components, and / or groups thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should also be noted that, as used herein, the terms "substantially", "about", and other similar terms are used as approximate terms rather than as terms of degree, and, as such, are used to explain the inherent deviations in measured values, calculated values, and / or provided values ​​that would be recognized by those of ordinary skill in the art.

[0056] Various exemplary embodiments are described herein with reference to cross-sectional illustrations and / or exploded illustrations that are schematic illustrations of idealized exemplary embodiments and / or intermediate structures. As such, differences from the illustrated shapes due to, for example, manufacturing techniques and / or tolerances should be expected. Therefore, the exemplary embodiments disclosed herein should not necessarily be interpreted as being limited to the shapes of the specifically illustrated zones, but rather as including deviations in shape due to, for example, manufacturing. In this manner, the zones illustrated in the accompanying drawings may be schematic in nature, and the shapes of these zones may not reflect the actual shapes of the zones of the device, and, as such, are not necessarily intended to be limiting.

[0057] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such in this article.

[0058] Figure 1 is a schematic perspective view of an exemplary embodiment of a display device constructed according to the principles of the present invention.

[0059] refer to Figure 1 , the display device 1 includes a display area DA that emits light and a non-display area NDA that does not emit light. The non-display area NDA is adjacent to the display area DA. The display device 1 can provide an image by using light emitted from a plurality of pixels arranged in the display area DA.

[0060] although Figure 1The display area DA is shown to have a quadrilateral shape, but exemplary embodiments are not limited thereto. For example, the shape of the display area DA may be circular, elliptical, or polygonal, such as triangular or pentagonal.

[0061] Although an organic light emitting display device is described as an example of the display device 1 according to an exemplary embodiment, the display device described herein is not limited thereto. According to another exemplary embodiment, the display device described herein may be a display device such as a quantum dot light emitting display device or other known types of display devices.

[0062] Multiple pixels P (reference Figure 5 ) may be arranged in the display area DA. Hereinafter, each pixel P refers to a sub-pixel that emits light of colors such as red (R), green (G), and blue (B). Each pixel P may be, for example, one of a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel.

[0063] The non-display area NDA is an area where no image is provided, and a scan driver and a data driver for providing electrical signals to be applied to the pixels P of the display area DA and power lines for providing power (such as a driving voltage and a common voltage) may be arranged in the non-display area NDA.

[0064] The display device 1 includes a substantially flat area (which may be in the form of a non-bending area NBA) and first and second curved areas (which may be in the form of a first and second curved areas BA1 and BA2). The first and second curved areas BA1 and BA2 of the display device 1 extend from the non-bending area NBA and are curved with a certain radius of curvature. The first and second curved areas BA1 and BA2 may be provided on either or both ends of the display device 1. The non-bending area NBA and the first and second curved areas BA1 and BA2 of the display device 1 may all be used as display screens, and therefore, a user may recognize an image via the non-bending area NBA and the first and second curved areas BA1 and BA2 of the display device 1.

[0065] Figure 2 It is along Figure 1 Schematic cross-sectional view taken along line II-II'. Figure 3 yes Figure 2 An enlarged view of part VI.

[0066] refer to Figure 2, the display device 1 may include a display panel 10, and an input sensing member 20 and an optical function member 30 arranged on the display panel 10, and the display panel 10, the input sensing member 20, and the optical function member 30 may be covered by a window 40. The display device 1 may be various electronic devices such as a mobile phone, a notebook computer, or a smart watch.

[0067] The display panel 10 may display an image. The display panel 10 includes pixels arranged in a display area DA. The pixels may include a display element and a pixel circuit connected thereto. According to an exemplary embodiment, the display element may include an organic light emitting diode.

[0068] The input sensing member 20 obtains coordinate information according to an external input (eg, a touch event). The input sensing member 20 may include a sensing electrode (or a touch electrode) and a trace connected to the sensing electrode. The input sensing member 20 may be disposed on the display panel 10.

[0069] The input sensing member 20 may be directly formed on the display panel 10, or may be separately formed and then combined with the display panel 10 through an adhesive layer such as an optically clear adhesive (OCA). For example, the input sensing member 20 may be continuously formed after a process of forming the display panel 10, and in this case, an adhesive layer may not be disposed between the input sensing member 20 and the display panel 10. Figure 2 The input sensing member 20 is shown to be disposed between the display panel 10 and the optical functional member 30. However, according to another exemplary embodiment, the input sensing member 20 may be disposed on the optical functional member 30.

[0070] The optical functional member 30 may include an anti-reflection layer. The anti-reflection layer may reduce the reflectivity of light (external light) incident on the window 40 in the direction from the outside toward the display panel 10. The anti-reflection layer may include a phase retarder and a polarizer. The phase retarder may be a film type or a liquid crystal coating type, and may include a λ / 2 phase retarder and / or a λ / 4 phase retarder. The polarizer may also be a film type or a liquid crystal coating type. The film type may include an elongated synthetic resin film, and the liquid crystal coating type may include liquid crystals arranged in a certain arrangement. The phase retarder and the polarizer may further include a protective film. The phase retarder and the polarizer itself or the protective film may be defined as a base layer of the anti-reflection layer.

[0071] According to another exemplary embodiment, the anti-reflection layer may include a black matrix and a color filter. The color filter may be arranged by considering the color of light emitted from each pixel of the display panel 10. According to another exemplary embodiment, the anti-reflection layer may include a destructive interference structure. The destructive interference structure may include a first reflective layer and a second reflective layer arranged on different layers from each other. The first reflected light and the second reflected light reflected from the first reflective layer and the second reflective layer, respectively, may destructively interfere, and therefore, the external light reflectivity may be reduced.

[0072] The optical functional member 30 may include a lens layer. The lens layer may increase the light output efficiency of the light emitted from the display panel 10, or may reduce color deviation. The lens layer may include a layer having a concave lens shape or a convex lens shape, and / or may include a plurality of layers having different refractive indices from each other. The optical functional member 30 may include both the anti-reflection layer and the lens layer described above, or may include any one of the anti-reflection layer and the lens layer.

[0073] The window 40 may increase the mechanical strength of the display device 1 and may protect the display panel 10 from external impact. Also, the window 40 may maintain the arc shape of the display device 1.

[0074] The window 40 may have a transmittance that facilitates transmission of the display screen of the display panel 10. The window 40 may include various materials. For example, the window 40 may include glass or plastic. In some exemplary embodiments, the window 40 may include glass or an optically transparent polymer. However, exemplary embodiments are not limited thereto, and the window 40 may include any material that allows a portion thereof to have an arc shape.

[0075] The window 40 may be formed by injection. However, exemplary embodiments are not limited thereto, and the first and second curved areas BA1 and BA2 having arc-shaped surfaces may be formed by bending both ends of the window 40 having a flat shape.

[0076] refer to Figure 3 , Figure 2 The non-bending area NBA and a portion VI of the second bending area BA2 are enlarged.

[0077] The second bending area BA2 of the display device 1 extends from the non-bending area NBA and is formed by bending. The boundary between the non-bending area NBA and the second bending area BA2 may be defined as a portion formed by angles θ1, θ2, θ3, and θ4 between an imaginary line l extending from the non-bending area NBA and a tangent line l' of a point on the upper surface of the second bending area BA2.

[0078] refer to Figure 3, the imaginary line l extending from the non-bending area NBA is parallel to the upper surface of the non-bending area NBA. Figure 3 Each of the points A, B, C and D shown in FIG. 1 is increasingly spaced from the non-bending area NBA. Also, θ1, θ2, θ3 and θ4 refer to angles between an imaginary line l extending from the non-bending area NBA and a tangent line l' at each of the points A, B, C and D.

[0079] As each of the points A, B, C, and D is increasingly spaced from the non-bending area NBA, the angles θ1, θ2, θ3, and θ4 between the imaginary line l extending from the non-bending area NBA and the tangent line l' of a point on the upper surface of the second bending area BA2 increase. The angle θ4 between the imaginary line l extending from the non-bending area NBA and the tangent line l' at point D is the largest among θ1, θ2, θ3, and θ4 (θ1<θ2<θ3<θ4). The curvature of the second bending area BA2 may increase as the distance of the second bending area BA2 from the non-bending area NBA increases. Although the description has been given based on the second bending area BA2, the first bending area BA1 may be symmetrical with the second bending area BA2 relative to the non-bending area NBA, and therefore, the first bending area BA1 and the second bending area BA2 have the same configuration.

[0080] refer to Figure 7 , a portion of the first bending area BA1 corresponding to the display area DA is imaginarily divided into a first area AR1, a second area AR2, a third area AR3, and a fourth area AR4. In this regard, point A may overlap with a pixel of the fourth area AR4, and point B may overlap with a pixel of the third area AR3. Also, point C may overlap with a pixel of the second area AR2, and point D may overlap with a pixel of the first area AR1.

[0081] Figure 4 yes Figure 2 1 is an equivalent circuit diagram of an exemplary embodiment of a representative pixel of a display panel of FIG. 1 .

[0082] refer to Figure 4 , each pixel P includes a pixel circuit PC and a display element connected to the pixel circuit PC. The display element may be in the form of an organic light emitting diode OLED. The pixel circuit PC may include a driving thin film transistor (TFT) T1, a switching TFT T2, and a storage capacitor Cst. Each pixel P may emit, for example, red (R) light, green (G) light, blue (B) light, or white (W) light through the organic light emitting diode OLED.

[0083] The switching TFT T2 may be connected to the scan line SL and the data line DL, and may be configured to transfer a data voltage input from the data line DL to the driving TFT T1 according to a switching voltage input from the scan line SL. The storage capacitor Cst may be connected to the switching TFT T2 and the driving voltage line PL, and may store a voltage corresponding to a difference between a voltage received from the switching TFT T2 and a first power supply voltage ELVDD supplied to the driving voltage line PL.

[0084] The driving TFT T1 may be connected to the driving voltage line PL and the storage capacitor Cst, and may control a driving current flowing from the driving voltage line PL through the organic light emitting diode OLED in response to a voltage value stored in the storage capacitor Cst. The organic light emitting diode OLED may emit light with brightness according to the driving current. An opposite electrode (e.g., a cathode) of the organic light emitting diode OLED may receive a second power supply voltage ELVSS.

[0085] although Figure 4 The pixel circuit PC including two TFTs and one storage capacitor is shown, but the exemplary embodiment is not limited thereto. The number of TFTs and the number of storage capacitors may be variously changed according to the design of the pixel circuit PC.

[0086] Figure 5 yes Figure 2 A plan view of an exemplary embodiment of a display panel. Figure 6 It is along Figure 5 Schematic cross-sectional views taken along line III-III′ and line IV-IV′ of FIG. 1 illustrate exemplary embodiments of a display panel.

[0087] refer to Figure 5 , the display panel 10 includes a display area DA and a non-display area NDA. Figure 5 It may be understood as the shape of the substrate 100 of the display panel 10. For example, the substrate 100 may be understood as having a display area DA and a non-display area NDA. Also, the display panel 10 includes a plurality of pixels P arranged in the display area DA.

[0088] The first bending area BA1 and the second bending area BA2 may be located on the edge of the substrate 100. The substrate 100 may have: a non-bending area NBA; a first bending area BA1 partially including the non-display area NDA and the display area DA on one side of the non-bending area NBA; and a second bending area BA2 partially including the non-display area NDA and the display area DA on the other side of the non-bending area NBA. Figure 5The first bending area BA1 and the second bending area BA2 provided on one side and the other side of the substrate 100 are shown, but the exemplary embodiment is not limited thereto. According to another exemplary embodiment, any one of the first bending area BA1 and the second bending area BA2 may be provided. According to another exemplary embodiment, it is sufficient that any portion of the substrate 100 has a bending area.

[0089] refer to Figure 6 , along Figure 5 A cross section taken along line III-III' shows a portion of the first bending area BA1, and a cross section taken along line IV-IV' shows a portion of the non-bending area NBA.

[0090] The display device 1 includes a non-bending area NBA and a first bending area BA1 and a second bending area BA2 extending from the non-bending area NBA, and the first pixel electrode 210 is arranged in the first bending area BA1 and the second bending area BA2, and the second pixel electrode 210' is arranged in the non-bending area NBA. The first emission layer 230 corresponds to the first pixel electrode 210, and the second emission layer 230' corresponds to the second pixel electrode 210'. Moreover, the first functional layer 220 is arranged between the first pixel electrode 210 and the first emission layer 230, and the second functional layer 220' is arranged between the second pixel electrode 210' and the second emission layer 230'. In this regard, the thickness tb of the first functional layer 220 may be greater than the thickness tc of the second functional layer 220'.

[0091] In the following, we will refer to Figure 6 The components included in the display device 1 are described in more detail in the stacking order of FIG.

[0092] The substrate 100 may include glass, ceramic, metal, or a flexible or bendable material. When the substrate 100 is flexible or bendable, the substrate 100 may include a polymer resin such as polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, or cellulose acetate propionate.

[0093] The substrate 100 may have a single layer or multilayer structure of the materials described above, and in the case of a multilayer structure, may further include an inorganic layer. In some exemplary embodiments, the substrate 100 may have a structure of organic material / inorganic material / organic material.

[0094] A barrier layer may be further included between the substrate 100 and the buffer layer 111. The barrier layer may prevent or reduce impurities from penetrating from the substrate 100 into the semiconductor layer A1 and the semiconductor layer A2. The barrier layer may include an inorganic material (such as an oxide or a nitride), an organic material, or an organic-inorganic composite material, and may have a single-layer or multi-layer structure of an inorganic material and an organic material.

[0095] The semiconductor layer A1 and the semiconductor layer A2 may be disposed on the buffer layer 111. The semiconductor layer A1 and the semiconductor layer A2 may include amorphous silicon or polycrystalline silicon. According to another exemplary embodiment, the semiconductor layer A1 and the semiconductor layer A2 may include an oxide of at least one material selected from the group consisting of indium (In), gallium (Ga), tin (Sn), zirconium (Zr), vanadium (V), hafnium (Hf), cadmium (Cd), germanium (Ge), chromium (Cr), titanium (Ti), aluminum (Al), cesium (Cs), cerium (Ce), and zinc (Zn).

[0096] The semiconductor layer A1 and the semiconductor layer A2 may each include a channel region and a source region and a drain region disposed at both sides of the channel region. The semiconductor layer A1 and the semiconductor layer A2 may have a single layer or a multi-layer structure.

[0097] The first gate insulating layer 113 and the second gate insulating layer 115 may be stacked over the substrate 100 to cover the semiconductor layer A1 and the semiconductor layer A2. The first gate insulating layer 113 and the second gate insulating layer 115 may include silicon oxide (SiO 2 ), Silicon Nitride (SiN x ), silicon oxynitride (SiON), aluminum oxide (Al 2 O 3 ), titanium oxide (TiO 2 ), Tantalum Oxide (Ta 2 O 5 ), hafnium oxide (HfO 2 ) or zinc oxide (ZnO).

[0098] The first gate electrode G1 and the second gate electrode G2 may be disposed on the first gate insulating layer 113 to at least partially overlap the semiconductor layer A1 and the semiconductor layer A2. Figure 6 The first gate electrode G1 and the second gate electrode G2 are shown to be disposed on the first gate insulating layer 113. However, according to another exemplary embodiment, the first gate electrode G1 and the second gate electrode G2 may be disposed on an upper surface of the second gate insulating layer 115. Also, the first gate electrode G1 and the second gate electrode G2 may be disposed on the same layer, or may be disposed on different layers.

[0099] According to an exemplary embodiment, Figure 6As shown in , the storage capacitor Cst may include a lower electrode CE1 and an upper electrode CE2, and may overlap with the first TFT TFT1. For example, the first gate electrode G1 of the first TFT TFT1 may be used as the lower electrode CE1 of the storage capacitor Cst. Different from this, the storage capacitor Cst may not overlap with the first TFT TFT1, but may exist separately.

[0100] The upper electrode CE2 of the storage capacitor Cst overlaps the lower electrode CE1 (the second gate insulating layer 115 is between the upper electrode CE2 and the lower electrode CE1) and forms a capacitance. In this case, the second gate insulating layer 115 may serve as a dielectric layer of the storage capacitor Cst.

[0101] An interlayer insulating layer 117 may be provided on the second gate insulating layer 115 to cover the upper electrode CE2 of the storage capacitor Cst. The interlayer insulating layer 117 may include silicon oxide (SiO 2 ), Silicon Nitride (SiN x ), silicon oxynitride (SiON), aluminum oxide (Al 2 O 3 ), titanium oxide (TiO 2 ), Tantalum Oxide (Ta 2 O 5 ), hafnium oxide (HfO 2 ) or zinc oxide (ZnO).

[0102] Source electrodes S1 and S2, drain electrodes D1 and D2, and Figure 4 The data line DL shown in FIG. 1 may be disposed on the interlayer insulating layer 117 .

[0103] The source electrodes S1 and S2, the drain electrodes D1 and D2, and the data lines DL may include a conductive material including molybdenum (Mo), aluminum (Al), copper (Cu), titanium (Ti), etc., and may have a multilayer or single-layer structure including the materials described above. For example, the source electrodes S1 and S2, the drain electrodes D1 and D2, and the data lines DL may have a multilayer structure of Ti / Al / Ti. The source electrodes S1 and S2, and the drain electrodes D1 and D2 may be connected to the source region or drain region of the semiconductor layers A1 and A2 via contact holes.

[0104] The source electrodes S1 and S2 and the drain electrodes D1 and D2 may be covered by an inorganic protective layer. The inorganic protective layer may be silicon nitride (SiN x ) and silicon oxide (SiO x ) of a single film or a multilayer film. An inorganic protective layer may be introduced to cover and protect some wiring arranged on the interlayer insulating layer 117.

[0105] The planarization layer 119 may cover the source electrodes S1 and S2 and the drain electrodes D1 and D2 , and the organic light emitting diodes OLED and OLED′ may be disposed on the planarization layer 119 .

[0106] The planarization layer 119 may include a film including an organic material in a single layer or multilayer structure, and may provide a flat upper surface. The planarization layer 119 may include a general commercial polymer (such as benzocyclobutene (BCB), polyimide, hexamethyldisiloxane (HMDSO), poly(methyl methacrylate) (PMMA) or polystyrene (PS)), a polymer derivative having a phenolic group, an acrylic polymer, an imide polymer, an aryl ether polymer, an amide polymer, a fluorine polymer, a p-xylene polymer, a vinyl alcohol polymer or a blend thereof.

[0107] The buffer layer 111, the first gate insulating layer 113, the second gate insulating layer 115, the interlayer insulating layer 117, and the planarization layer 119 where the first TFT TFT1 and the second TFT TFT2 are located are collectively referred to as a circuit layer 110. Also, the first TFT TFT1, the second TFT TFT2, and the storage capacitor Cst are collectively defined as a first circuit portion C1.

[0108] The organic light emitting diode OLED and the organic light emitting diode OLED' are arranged on the planarization layer 119. The organic light emitting diode OLED and the organic light emitting diode OLED' include first and second pixel electrodes 210 and 210', first and second functional layers 220 and 220', first and second auxiliary layers 221 and 221', first and second emission layers 230 and 230', an upper functional layer 240, and an opposite electrode 250.

[0109] The first pixel electrode 210 and the second pixel electrode 210' may be (semi) light-transmitting electrodes or reflective electrodes. In some exemplary embodiments, the first pixel electrode 210 and the second pixel electrode 210' may include a reflective layer and a transparent or semi-transparent electrode layer on the reflective layer, the reflective layer including silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr) or a compound thereof. The transparent or semi-transparent electrode layer may include an indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In 2 O 3 ), at least one of the group consisting of indium gallium oxide (IGO) and aluminum zinc oxide (AZO). In some exemplary embodiments, the first pixel electrode 210 and the second pixel electrode 210 ′ may include ITO / Ag / ITO.

[0110] The pixel defining layer 120 may be disposed on the planarization layer 119. Also, the pixel defining layer 120 may prevent arcing from occurring at edges of the first pixel electrode 210 and the second pixel electrode 210' by increasing a distance between edges of the first pixel electrode 210 and the second pixel electrode 210' and an opposing electrode 250 disposed above the first pixel electrode 210 and the second pixel electrode 210'.

[0111] The pixel defining layer 120 may be formed by a method such as spin coating using one or more organic insulating materials selected from the group consisting of polyimide, polyamide, acrylic resin, BCB, and phenolic resin.

[0112] The first functional layer 220 and the second functional layer 220' may be arranged in the display area DA, and may be disposed on the pixel defining layer 120 and the first pixel electrode 210 and the second pixel electrode 210'. The first functional layer 220 and the second functional layer 220' may have a single-layer or multi-layer structure. For example, when the first functional layer 220 and the second functional layer 220' include a polymer organic material, each of the first functional layer 220 and the second functional layer 220' may include a hole transport layer (HTL) having a single-layer structure, and the hole transport layer (HTL) includes poly (3,4-ethylenedioxythiophene) (PEDOT) or polyaniline (PANI). When the first functional layer 220 and the second functional layer 220' include a low molecular weight organic material, each of the first functional layer 220 and the second functional layer 220' may include a hole injection layer (HIL) and the HTL.

[0113] Figure 6 Respective pixel structures of the first bending area BA1 and the non-bending area NBA are shown. The first functional layer 220 and the second functional layer 220 ′ may be continuously formed in one or more processes to be integrated with each other.

[0114] The first auxiliary layer 221 and the second auxiliary layer 221' may be arranged on the first functional layer 220 and the second functional layer 220', respectively, to correspond to the first pixel electrode 210 and the second pixel electrode 210'. The first auxiliary layer 221 and the second auxiliary layer 221' may select the distance between the first pixel electrode 210 and the second pixel electrode 210' and the opposite electrode 250. For example, if the thickness of the first auxiliary layer 221 and the second auxiliary layer 221' is thin, the distance between the first pixel electrode 210 and the second pixel electrode 210' and the opposite electrode 250 may be reduced. The organic light emitting diode OLED emits amplified light of a specific wavelength, and the amplified specific wavelength varies according to the distance between the first pixel electrode 210 and the second pixel electrode 210' and the opposite electrode 250. That is, the wavelength band in which constructive interference occurs is determined by the distance between the first pixel electrode 210 and the second pixel electrode 210' and the opposite electrode 250, and the organic light emitting diode OLED may emit amplified light of a specific wavelength. Thus, the first and second auxiliary layers 221 and 221' can control the amplified specific wavelength in the organic light emitting diode OLED by adjusting the distance between the first and second pixel electrodes 210 and 210' and the opposite electrode 250. In addition, the first and second auxiliary layers 221 and 221' may be HTLs.

[0115] The first emission layer 230 and the second emission layer 230' may be arranged on the first auxiliary layer 221 and the second auxiliary layer 221', respectively. The first emission layer 230 and the second emission layer 230' may include an organic material including a fluorescent material or a phosphorescent material emitting red, green, blue or white light. The first emission layer 230 and the second emission layer 230' may include a low molecular weight organic material or a polymer organic material.

[0116] The upper functional layer 240 may be arranged in the display area DA, and may be arranged on the first functional layer 220 and the second functional layer 220' and the first emission layer 230 and the second emission layer 230'. The upper functional layer 240 may be omitted. For example, when the first functional layer 220 and the second functional layer 220' and the first emission layer 230 and the second emission layer 230' include a polymer organic material, the upper functional layer 240 may be formed to make the characteristics of the organic light emitting diode OLED and the organic light emitting diode OLED' excellent. The upper functional layer 240 may have a single-layer or multi-layer structure. The upper functional layer 240 may include an electron transport layer (ETL) and / or an electron injection layer (EIL).

[0117] The counter electrode 250 may be a light-transmitting electrode or a reflective electrode. In some exemplary embodiments, the counter electrode 250 may be a transparent or semi-transparent electrode and may include a metal thin film having a low work function and including Li, Ca, LiF / Ca, LiF / Al, Al, Ag, Mg, or a compound thereof. In addition, a transparent conductive oxide (TCO) film (such as ITO, IZO, ZnO, or In 2 O 3 ) may be further arranged on the metal film. The opposing electrode 250 may be arranged in the display area DA and may be arranged in the first and second functional layers 220 and 220' and the first and second emission layers 230 and 230'. The opposing electrode 250 may be integrally formed in the display area DA to correspond to the first and second pixel electrodes 210 and 210'.

[0118] The capping layer may be arranged on the opposing electrode 250. The capping layer may be configured to protect the opposing electrode 250 and may be configured to increase light extraction efficiency. For example, the capping layer may include a material having a refractive index of 1.2 to 3.1. Moreover, the capping layer may include an organic material. However, the capping layer may be removed.

[0119] refer to Figure 6 , the thickness tb of the first functional layer 220 disposed in the first bending area BA1 may be greater than the thickness tc of the second functional layer 220' disposed in the non-bending area NBA. Although the enlarged view shows the thickness tb of the first functional layer 220 and the thickness tc of the second functional layer 220' located on the pixel defining layer 120, the thickness tb of the first functional layer 220 may be the same even on the first pixel electrode 210, and the thickness tc of the second functional layer 220' may be constant anywhere in the non-bending area NBA.

[0120] According to an exemplary embodiment, the thickness tc of the second functional layer 220' may be about And the thickness tb of the first functional layer 220 may be greater than about and less than about This is because when the thickness tb of the first functional layer 220 is greater than about When the color in the first bending area BA1 is changed, unexpected process changes may be caused, and the difference between the color in the first bending area BA1 and the color in the non-bending area NBA may be changed within about 1:1. to about In particular, the thickness tb of the first functional layer 220 for matching the difference between the color vision entering the visual field in the first bending area BA1 and the color vision entering the visual field in the non-bending area NBA may be about to Reference below Fig.11 Give a more detailed description thereof.

[0121] Fig.11 It is a chromaticity graph.

[0122] refer to Fig.11 The color scheme "CIE 1931" published in 1931 by the International Commission on Illumination (CIE), which regulates light, lighting, color, and color space, represents the region of visible light visible to the human eye.

[0123] If the functional layer disposed under the emitting layer arranged in the curved region has the same thickness as the functional layer disposed under the emitting layer arranged in the non-curved region, the viewing angle of the curved region may be different from that of the non-curved region according to the refractive index, which results in the color perceived in the curved region being different from the color perceived in the non-curved region. For example, in the non-curved region, white W obtained by uniformly combining red R, green G, and blue B may be perceived, however, in the curved region, the concentrations of red R and green G increase, and this may result in yellow Y being perceived instead of white. Reference Fig.11 , showing yellow Y due to the deflection in direction -a.

[0124] The specific wavelength amplified in the organic light emitting diode OLED can be determined by the distance between the pixel electrode and the relative electrode. In the non-bending area, the first wavelength can be amplified by the distance between the pixel electrode and the relative electrode. However, since the variable called the viewing angle in the bending area is affected, the second wavelength can be amplified by the distance between the pixel electrode and the relative electrode, which is shorter than that in the non-bending area from the viewing angle. In this way, the specific wavelength amplified for the non-bending area and the bending area is different. As a result, the brightness of red, green and blue is different in the non-bending area and the bending area, and the brightness ratio of red, green and blue is different, so that the color perception entering the field of view is different. For example, the specific wavelength amplified in the organic light emitting diode OLED emitting red light corresponds to the red wavelength band, and the red brightness is increased, and the specific wavelength amplified in the organic light emitting diode OLED emitting green light increases the green wavelength band, and the green brightness is increased. However, the specific wavelength amplified in the organic light emitting diode OLED emitting blue light does not correspond to the blue wavelength band, so the blue brightness may be reduced. That is, compared with the brightness of red and green, the brightness of blue in the bending area may be relatively reduced, and the color perception entering the field of view may be yellow.

[0125] Unlike this case, in the illustrated exemplary embodiment, the thickness tb of the first functional layer 220 disposed in the first bending area BA1 is greater than the thickness tc of the second functional layer 220' disposed in the non-bending area NBA, and the viewing angle of the first bending area BA1 can be adjusted to adjust the viewing angle of the first bending area BA1. Fig.11 The yellow color Y caused by the deflection in the direction -a in the first bending area BA1 moves back in the direction +a and is located at the origin O, thereby displaying a complete white color W. That is, white color W can be perceived instead of yellow color Y in the first bending area BA1, and the difference in perceived color between the first bending area BA1 and the non-bending area NBA can be improved and / or reduced. Although the description has been given based on the first bending area BA1, the second bending area BA2 can be configured the same as the first bending area BA1.

[0126] When the thickness of the first functional layer 220 disposed in the first bending area BA1 is adjusted, all distances between the first pixel electrode 210 and the second pixel electrode 210' and the opposite electrode 250 in the first bending area BA1 and the non-bending area NBA can be controlled. By doing so, since a specific wavelength amplified in the organic light emitting diode OLED disposed in the first bending area BA1 can be controlled, the brightness ratio of red, green, and blue in the first bending area BA1 can be adjusted. Therefore, since the brightness ratio of red, green, and blue can be adjusted to be close to 1:1:1, the color perception entering the field of view in the first bending area BA1 can be white.

[0127] Figure 7 yes Figure 5 A plan view of a display panel illustrating a curved region having multiple arc-shaped regions. Fig. 8A It is along Figure 7 A schematic cross-sectional view taken along line VV′ of FIG. 1 illustrates another exemplary embodiment of a display panel. Figure 8B It is schematically explained Fig. 8A A diagram showing a comparison of the thickness of certain layers of a display element. Figure 7 and Fig. 8A In, with Figure 5 and Figure 6 The same reference numerals as in the drawings represent the same elements, and thus, their repeated descriptions will be omitted for the sake of brevity.

[0128] refer to Figure 7 The display panel 10 includes a display area DA and a non-display area NDA, and includes a plurality of pixels P arranged in the display area DA (see Figure 5). Also, the substrate 100 may have: a non-bending area NBA; a first bending area BA1 partially including the non-display area NDA and the display area DA on one side of the non-bending area NBA; and a second bending area BA2 partially including the non-display area NDA and the display area DA on the other side of the non-bending area NBA.

[0129] The first, second, third and fourth areas AR1, AR2, AR3 and AR4 are obtained by virtually dividing a portion of the first bending area BA1 corresponding to the display area DA into four. The first area AR1 is farthest from the non-bending area NBA and the fourth area AR4 is closest to the non-bending area NBA.

[0130] Return to reference Figure 3 , the first area AR1 includes a point D, where the angle between the imaginary line l extending from the non-bending area NBA and the tangent line l' of a point on the upper surface of any one of the first bending area BA1 and the second bending area BA2 is θ4, and the second area AR2 includes a point C, where the angle is θ3. Moreover, the third area AR3 includes a point B, where the angle is θ2, and the fourth area AR4 includes a point A, where the angle is θ1.

[0131] For convenience only, the portion of the first bending area BA1 corresponding to the display area DA is divided into four parts for describing Fig. 8A An exemplary embodiment of the invention is described in detail below.

[0132] Fig. 8A Shows Figure 7 Respective cross sections of the first area AR1, the second area AR2, the third area AR3 and the fourth area AR4.

[0133] refer to Fig. 8A , the circuit layer 110 may be disposed on the substrate 100 , and include and / or arrange first to fourth circuit portions C1 , C2 , C3 , and C4 in the circuit layer 110 .

[0134] The first pixel electrode 210a, the second pixel electrode 210b, the third pixel electrode 210c and the fourth pixel electrode 210d are respectively connected to the first circuit portion C1, the second circuit portion C2, the third circuit portion C3 and the fourth circuit portion C4. Moreover, the pixel defining layer 120 is arranged on the first pixel electrode 210a to the fourth pixel electrode 210d to cover the edges of the first pixel electrode 210a to the fourth pixel electrode 210d and partially expose the first pixel electrode 210a to the fourth pixel electrode 210d.

[0135] The first display element OLED1 includes a first pixel electrode 210a, a first functional layer 220a covering the pixel defining layer 120 and the first pixel electrode 210a, a first auxiliary layer 221a arranged on the first functional layer 220a and corresponding to the first pixel electrode 210a, a first emission layer 230a arranged on the first auxiliary layer 221a, an upper functional layer 240 arranged on the first emission layer 230a, and a relative electrode 250 arranged on the upper functional layer 240.

[0136] The second display element OLED2 includes a second pixel electrode 210b, a second functional layer 220b, a second auxiliary layer 221b, a second emission layer 230b, an upper functional layer 240, and an opposite electrode 250. The third display element OLED3 includes a third pixel electrode 210c, a third functional layer 220c, a third auxiliary layer 221c, a third emission layer 230c, an upper functional layer 240, and an opposite electrode 250. Moreover, the fourth display element OLED4 includes a fourth pixel electrode 210d, a fourth functional layer 220d, a fourth auxiliary layer 221d, a fourth emission layer 230d, an upper functional layer 240, and an opposite electrode 250.

[0137] Fig. 8A Respective pixel structures of the first, second, third, and fourth regions AR1, AR2, AR3, and AR4 are shown.The first, second, third, and fourth functional layers 220a, 220b, 220c, and 220d may be continuously formed in one or more processes to be integrated with each other.

[0138] According to an exemplary embodiment, the thickness tb of each of the first to fourth functional layers 220a, 220b, 220c, and 220d is 1 ,tb 2 ,tb 3 and tb 4 The curve may be obtained based on the line between the imaginary line l extending from the non-bending area NBA and the tangent line l′ of a point on the upper surface of any one of the first to second bending areas BA1 to BA2 overlapping the first to fourth display elements OLED1 to OLED4. Figure 3 The angles θ4, θ3, θ2 and θ1 shown in FIG. 8 are changed and / or determined.

[0139] According to another exemplary embodiment, as the angles θ1, θ2, θ3, and θ4 between the imaginary line l extending from the non-bending area NBA and the tangent line l' of a point on the upper surface of any one of the first bending area BA1 and the second bending area BA2 increase, the thicknesses tb of the first to fourth functional layers 220a, 220b, 220c, and 220d increase. 4 ,tb 3 ,tb2 and tb 1 Can be increased. Refer to the following Figure 8B and Fig.11 Give its detailed description.

[0140] Figure 8B The layers of each of the first to fourth display elements OLED1 to OLED4 are shown.

[0141] refer to Figure 8B , the thickness tb of the first functional layer 220a 1 Maximum, and with the thickness tb of the second functional layer 220b 2 , the thickness tb of the third functional layer 220c 3 and the thickness tb of the fourth functional layer 220d 4 In this regard, the thickness tb of each of the first to fourth functional layers 220a, 220b, 220c and 220d is 1 ,tb 2 ,tb 3 and tb 4 It may be gradually reduced in each of the first to fourth areas AR1, AR2, AR3, and AR4, or may be gradually reduced without distinguishing the areas.

[0142] More specifically, as the curvatures of the first and second bending areas BA1 and BA2 increase, angles θ1, θ2, θ3, and θ4 between an imaginary line l extending from the non-bending area NBA and a tangent line l′ of a point on the upper surface of either the first and second bending areas BA1 and BA2 increase (θ1<θ2<θ3<θ4), and the thickness tb increases. 4 ,tb 3 ,tb 2 and tb 1 It may also be increased sequentially according to the amount by which the angles θ1, θ2, θ3 and θ4 increase.

[0143] If the thickness of the functional layer can be the same throughout the curved region, the viewing angle of each point in the curved region may vary depending on the refractive index, and therefore, differences in perceived color may occur at various points in the curved region. As the curvature of the curved region increases, the viewing angle of each point in the curved region increases compared to the non-curved region, and this may cause the color perceived from one point in the curved region to be different from the color perceived at another point in the curved region. For example, the concentrations of red R and green G may increase as the distance of the curved region from the non-curved region increases, and therefore, yellow Y may be clearly perceived in the curved region farthest from the non-curved region. Reference Fig.11As the curvature of the curved area and / or the angle between the imaginary line l and the tangent line l' increases, the yellow color Y becomes clearer at the corresponding point of the curved area due to the deflection in the direction -a.

[0144] Unlike this case, in the illustrated exemplary embodiment, the thickness tb may be formed differently according to the amount by which the angles θ1, θ2, θ3, and θ4 between the imaginary line l extending from the non-bending area NBA and the tangent line l′ of a point on the upper surface of any one of the first bending area BA1 and the second bending area BA2 are increased. 4 ,tb 3 ,tb 2 and tb 1 In this case, the viewing angle of each of the first area AR1, the second area AR2, the third area AR3, and the fourth area AR4 may be adjusted to Fig.11 The yellow color Y caused by the deflection in the direction -a in the first bending area BA1 moves back in the direction +a and is located at the origin O showing the complete white color W. That is, white color W rather than yellow color Y can be perceived in the first bending area BA1, and the difference in perceived color between the first bending area BA1 and the non-bending area NBA and between the first area AR1 to the fourth area AR4 can be improved and / or reduced. Although the description has been given based on the first bending area BA1, the second bending area BA2 can be configured the same as the first bending area BA1.

[0145] According to an exemplary embodiment, the thickness tb of the first to fourth functional layers 220a, 220b, 220c, and 220d is 1 ,tb 2 ,tb 3 and tb 4 Can be in about to about When the thicknesses tb1, tb2, tb3, and tb4 of the first to fourth functional layers 220a, 220b, 220c, and 220d are greater than about When the color is changed, unexpected process changes may occur, and the length of the wavelength corresponding to the color may be around to about can be adjusted within a certain range.

[0146] Fig. 9A It is along Figure 5 Schematic cross-sectional views taken along line III-III′ and line IV-IV′ of FIG. 1 illustrate yet another exemplary embodiment of a display panel. Fig. 9B is a schematic illustration of the emission of light of different colors from each other. Fig. 9A A diagram showing a comparison of the thicknesses of some of the layers of the display elements. Fig. 9Cis a schematic diagram illustrating the arrangement of the curved area and the non-curved area. Fig. 9A A diagram showing a comparison of the thicknesses of some of the layers of the display elements. Fig.9D is a schematic diagram illustrating the arrangement of the curved area and the non-curved area. Fig. 9A A diagram comparing the thickness of other display element layers. Fig. 9A In, with Figure 6 The same reference numerals as in the drawings represent the same elements, and thus, their repeated descriptions will be omitted for the sake of brevity.

[0147] refer to Fig. 9A The first pixel electrode 210G is disposed in the first bending area BA1, and the first emission layer 230G corresponds to the first pixel electrode 210G. The second pixel electrode 210G' is disposed in the non-bending area NBA, and the second emission layer 230G' corresponds to the second pixel electrode 210G'.

[0148] The first functional layer 220 is arranged between the first pixel electrode 210G and the first emission layer 230G, and the second functional layer 220' is arranged between the second pixel electrode 210G' and the second emission layer 230G'. Moreover, the first auxiliary layer 221G is arranged between the first functional layer 220 and the first emission layer 230G, and the second auxiliary layer 221G' is arranged between the second functional layer 220' and the second emission layer 230G'.

[0149] The first emission layer 230G and the second emission layer 230G′ may emit the same first color light, and the thickness of the first auxiliary layer 221G is tb 1 may be smaller than the thickness tc of the second auxiliary layer 221G′ 1 .

[0150] According to another exemplary embodiment, the third pixel electrode 210R is disposed in the first bending area BA1 and the third emission layer 230R corresponds to the third pixel electrode 210R. The fourth pixel electrode 210R' is disposed in the non-bending area NBA and the fourth emission layer 230R' corresponds to the fourth pixel electrode 210R'.

[0151] The first functional layer 220 is arranged between the third pixel electrode 210R and the third emission layer 230R, and the second functional layer 220' is arranged between the fourth pixel electrode 210R' and the fourth emission layer 230R'. Moreover, the third auxiliary layer 221R is arranged between the first functional layer 220 and the third emission layer 230R, and the fourth auxiliary layer 221R' is arranged between the second functional layer 220' and the fourth emission layer 230R'.

[0152] The third emission layer 230R and the fourth emission layer 230R′ may emit light of the same second color different from the first color, and the thickness tb of the third auxiliary layer 221R is 2 may be smaller than the thickness tc of the fourth auxiliary layer 221R′ 2 .

[0153] According to example embodiments, the first emission layer 230G and the second emission layer 230G′ may emit light of a green (G) wavelength, and the third emission layer 230R and the fourth emission layer 230R′ may emit light of a red (R) wavelength.

[0154] refer to Fig. 9A , the substrate 100 is in the first bending area BA1 and the non-bending area NBA, and the circuit layer 110 is disposed on the substrate 100. The first to sixth circuit portions C1, C2, C3, C4, C5, and C6 are included and / or disposed in the circuit layer 110 and are connected to the first to sixth pixel electrodes 210G, 210G', 210R, 210R', 210B, and 210B', respectively.

[0155] Moreover, the pixel defining layer 120 is arranged on the first to sixth pixel electrodes 210G, 210G', 210R, 210R', 210B and 210B' to cover the edges of the first to sixth pixel electrodes 210G, 210G', 210R, 210R', 210B and 210B' and partially expose the first to sixth pixel electrodes 210G, 210G', 210R, 210R', 210B and 210B'. The first functional layer 220 and the second functional layer 220' cover the pixel defining layer 120 and the first to sixth pixel electrodes 210G, 210G', 210R, 210R', 210B and 210B'. The first functional layer 220 and the second functional layer 220' are named differently only according to the first bending area BA1 and the non-bending area NBA. The first functional layer 220 and the second functional layer 220 ′ may have the same thickness as or different thicknesses from each other.

[0156] In the first bending area BA1, the first auxiliary layer 221G is disposed on the first functional layer 220 to correspond to the first pixel electrode 210G, and the third auxiliary layer 221R corresponds to the third pixel electrode 210R. Also, the fifth emission layer 230B corresponds to the fifth pixel electrode 210B.

[0157] In the non-bending area NBA, the second auxiliary layer 221G' is disposed on the second functional layer 220' to correspond to the second pixel electrode 210G', and the fourth auxiliary layer 221R' corresponds to the fourth pixel electrode 210R'. Also, the sixth emission layer 230B' corresponds to the sixth pixel electrode 210B'.

[0158] The first emission layer 230G, the second emission layer 230G', the third emission layer 230R and the fourth emission layer 230R' are arranged on the first auxiliary layer 221G, the second auxiliary layer 221G', the third auxiliary layer 221R and the fourth auxiliary layer 221R' respectively. Moreover, the upper functional layer 240 covers the first functional layer 220, the second functional layer 220' and the first to sixth emission layers 230G, 230G', 230R, 230R', 230B and 230B', and the relative electrode 250 is arranged on the upper functional layer 240.

[0159] Fig. 9B The layers of each of the first display element OLED1 and the third display element OLED3 are explained.

[0160] refer to Fig. 9B The thickness of the first auxiliary layer 221G is tb 1 may be smaller than the thickness tb of the third auxiliary layer 221R 2 This is because the first emission layer 230G and the third emission layer 230R may emit light of different colors, such as green (G) light and red (R) light, respectively, and the optical distance may be adjusted accordingly.

[0161] Fig. 9C and Fig.9D The layers of each of the first to fourth display elements OLED1 to OLED4 are explained.

[0162] refer to Fig. 9C and Fig.9D The thickness of the first auxiliary layer 221G is tb 1 may be smaller than the thickness tc of the second auxiliary layer 221G′ 1 , and the thickness of the third auxiliary layer 221R is tb 2 may be smaller than the thickness tc of the fourth auxiliary layer 221R′ 2 .

[0163] If the thickness of the auxiliary layer arranged in the curved area is the same as the thickness of the auxiliary layer arranged in the non-curved area, the viewing angle of the curved area may be different from that of the non-curved area according to the refractive index, which causes the color perceived in the curved area to be different from the color perceived in the non-curved area.

[0164] For example, in a non-bending area, white W obtained by uniformly combining red R, green G, and blue B may be perceived, however, in a bending area, the concentrations of red R and green G increase, and this may result in perception of yellow Y. Because the auxiliary layer is located below the emission layer that emits red (R) light and green (G) light, Fig.11 Moving in direction +b and / or direction +c results in yellow Y.

[0165] Unlike this case, as in the illustrated embodiment, the thickness tb of the first auxiliary layer 221G arranged in the first bending area BA1 is 1 may be smaller than the thickness tc of the second auxiliary layer 221G′ disposed in the non-bending area NBA. 1 , and the thickness tb of the third auxiliary layer 221R arranged in the first bending area BA1 2 may be smaller than the thickness tc of the fourth auxiliary layer 221R′ disposed in the non-bending area NBA. 2 In this case, the viewing angle of the first bending area BA1 can be adjusted to Fig.11 The green G in the direction +b and the red R in the direction +c are moved back in the directions -b and -c, respectively, and are located at the origin O showing the complete white W. That is, the white W can be perceived instead of the yellow Y in the first bending area BA1, and the difference in perceived color between the first bending area BA1 and the non-bending area NBA can be improved and / or reduced. Although the description has been given based on the first bending area BA1, the second bending area BA2 can be configured the same as the first bending area BA1.

[0166] When the thickness of the first auxiliary layer 221G and the third auxiliary layer 221R disposed in the first bending area BA1 is adjusted, the brightness ratio of red and green in the first bending area BA1 can be controlled. Therefore, since the brightness ratio of red, green, and blue can be adjusted to be close to 1:1:1, the color perception entering the field of view in the first bending area BA1 can be white.

[0167] According to an exemplary embodiment, the thickness tc of the second auxiliary layer 221G′ is 1 Can be about The thickness of the first auxiliary layer 221G is tb 1 Can be about to about Moreover, the thickness tc of the fourth auxiliary layer 221R′ is 2 Can be about The thickness of the third auxiliary layer 221R is tb 2 Can be about to about

[0168] Fig. 10A It is along Figure 7 A schematic cross-sectional view taken along line VV' of FIG. 1 illustrates yet another exemplary embodiment of a display panel. Fig. 10B It is schematically explained Fig. 10A FIG. 10A shows a comparison of the thickness of certain layers of a display element. Fig. 8A The same reference numerals as in the drawings represent the same elements, and thus, their repeated descriptions will be omitted for the sake of brevity.

[0169] Fig. 10A Shows Figure 7 Respective cross sections of the first area AR1, the second area AR2, the third area AR3 and the fourth area AR4.

[0170] refer to Fig. 10A , the circuit layer 110 may be disposed on the substrate 100 , and the first to fourth circuit portions C1 , C2 , C3 , and C4 may be included and / or disposed in the circuit layer 110 .

[0171] The first pixel electrode 210a, the second pixel electrode 210b, the third pixel electrode 210c and the fourth pixel electrode 210d are connected to the first circuit portion C1, the second circuit portion C2, the third circuit portion C3 and the fourth circuit portion C4, respectively. Moreover, the pixel defining layer 120 is arranged on the first pixel electrode 210a to the fourth pixel electrode 210d to cover the edges of the first pixel electrode 210a to the fourth pixel electrode 210d and partially expose the first pixel electrode 210a to the fourth pixel electrode 210d. Moreover, the first functional layer 220 covers the pixel defining layer 120 and the first pixel electrode 210a to the fourth pixel electrode 210d.

[0172] The first auxiliary layer 221a is disposed on the first functional layer 220 to correspond to the first pixel electrode 210a, and the second auxiliary layer 221b corresponds to the second pixel electrode 210b. Also, the third auxiliary layer 221c corresponds to the third pixel electrode 210c, and the fourth auxiliary layer 221d corresponds to the fourth pixel electrode 210d.

[0173] The first emission layer 230a, the second emission layer 230b, the third emission layer 230c and the fourth emission layer 230d are arranged on the first auxiliary layer 221a, the second auxiliary layer 221b, the third auxiliary layer 221c and the fourth auxiliary layer 221d, respectively. Moreover, the upper functional layer 240 covers the first functional layer 220 and the first to fourth emission layers 230a, 230b, 230c and 230d, and the relative electrode 250 is arranged on the upper functional layer 240.

[0174] although Fig. 10A The first to fourth regions AR1, AR2, AR3, and AR4 are shown to include the first to fourth display elements OLED1, OLED2, OLED3, and OLED4, respectively, but two or more display elements may be included in each of the first to fourth regions AR1, AR2, AR3, and AR4. The first to fourth display elements OLED1, OLED2, OLED3, and OLED4 may emit light of the same color.

[0175] According to an exemplary embodiment, the thickness tb of the first to fourth auxiliary layers 221a, 221b, 221c, and 221d is 1 ,tb 2 ,tb 3 and tb 4 The distance between the imaginary line l extending from the non-bending area NBA and the tangent line l′ of a point on the upper surface of any one of the first bending area BA1 and the second bending area BA2 may be determined based on the distance between the imaginary line l extending from the non-bending area NBA and the tangent line l′ of a point on the upper surface of any one of the first bending area BA1 and the second bending area BA2. Figure 3 The angles θ4, θ3, θ2 and θ1 shown in FIG. 8 are changed.

[0176] According to another exemplary embodiment, as the angles θ1, θ2, θ3, and θ4 between the imaginary line l extending from the non-bending area NBA and the tangent line l' of a point on the upper surface of any one of the first bending area BA1 and the second bending area BA2 increase, the thickness tb 4 ,tb 3 ,tb 2 and tb 1 Can be reduced. Refer to the following Fig. 10B and Fig.11 Give its detailed description.

[0177] Fig. 10B The layers of each of the first to fourth display elements OLED1 to OLED4 are shown.

[0178] refer to Fig. 10B , the thickness of the first auxiliary layer 221a is tb 1 minimum, and the thickness tb of the second auxiliary layer 221b is 2 , the thickness tb of the third auxiliary layer 221c 3 and the thickness tb of the fourth auxiliary layer 221d 4 The order of occurrence increases successively.

[0179] More specifically, as the curvatures of the first and second bending areas BA1 and BA2 increase, angles θ1, θ2, θ3, and θ4 between an imaginary line l extending from the non-bending area NBA and a tangent line l' to a point on the upper surface of either the first and second bending areas BA1 and BA2 increase (θ1<θ2<θ3<θ4), and the thickness tb increases. 4 ,tb 3 ,tb 2 and tb 1 The amount of increase may be decreased in sequence according to the angles θ1, θ2, θ3 and θ4.

[0180] If the thickness of the auxiliary layer is the same throughout the curved region, the viewing angle of each point in the curved region may vary depending on the refractive index, and therefore, differences in perceived color occur at various points in the curved region. As the curvature of the curved region increases, the viewing angle of each point in the curved region increases compared to the non-curved region, and this may cause the color perceived from one point in the curved region to be different from the color perceived at another point in the curved region. For example, the concentration of red R and green G may increase as the distance of the curved region from the non-curved region increases, so that yellow Y may be clearly perceived in the curved region farthest from the non-curved region. Because the auxiliary layer is located below the emitting layer that emits red (R) light and green (G) light, Fig.11 The light emitting layer is moved in the direction +b and / or direction +c, thereby resulting in yellow Y. In particular, when the emission layer emits green (G) light, the light emitting layer is moved in the direction +b, and when the emission layer emits red (R) light, the light emitting layer is moved in the direction +c.

[0181] Unlike this case, in the illustrated exemplary embodiment, the thickness tb may be formed differently according to the amount by which the angles θ1, θ2, θ3, and θ4 between the imaginary line l extending from the non-bending area NBA and the tangent line l′ of a point on the upper surface of any one of the first bending area BA1 and the second bending area BA2 are increased. 4 ,tb 3 ,tb 2 and tb 1 In this case, the viewing angle of each of the first area AR1, the second area AR2, the third area AR3, and the fourth area AR4 may be adjusted to Fig.11The green G in the direction +b and the red R in the direction +c are moved back in the directions -b and -c, respectively, and are located at the origin O showing the complete white W. That is, the white W can be perceived instead of the yellow Y in the first bending area BA1, and the difference in perceived color between the first bending area BA1 and the non-bending area NBA and between the first area AR1 to the fourth area AR4 can be improved and / or reduced. Although the description has been given based on the first bending area BA1, the second bending area BA2 can be configured the same as the first bending area BA1.

[0182] Fig.11 It is a chromaticity graph.

[0183] refer to Fig.11 , each of the three vertices corresponds to red R, green G, and blue B, and the origin O refers to white W obtained by uniformly combining red R, green G, and blue B.

[0184] Direction a means according to Figure 6 The color changes as shown in FIG. 1 and FIG. 2 are caused by changes in the thicknesses tb and tc of the first functional layer 220 and the second functional layer 220 ′, and this corresponds to a change in color obtained by combining all of red R, green G, and blue B. Figure 6 As described, according to the illustrated embodiment, when the thickness tb of the first functional layer 220 is greater than the thickness tc of the second functional layer 220', movement is performed in the direction +a, and white W is relatively perceived compared to a case where the thickness tb of the first functional layer 220 and the thickness tc of the second functional layer 220' are the same as each other.

[0185] Direction b indicates that Fig. 10A The thickness tb of the first to fourth auxiliary layers 221a, 221b, 221c, and 221d arranged below the first to fourth emission layers 230a, 230b, 230c, and 230d emitting green (G) light shown in FIG. 1 ,tb 2 ,tb 3 and tb 4 The color of the change changes, and this corresponds to the change in the concentration of green G. Fig. 10A As described, according to the illustrated exemplary embodiment, the thickness tb may be formed differently according to the amount by which the angles θ1, θ2, θ3, and θ4 between the imaginary line l extending from the non-bending area NBA and the tangent line l′ of a point on the upper surface of any one of the first bending area BA1 and the second bending area BA2 are increased. 4 ,tb 3 ,tb 2 and tb 1, and in this case, the movement is performed in direction -b.

[0186] Direction c represents the thickness tb of the first to fourth auxiliary layers 221a, 221b, 221c, and 221d arranged under the first to fourth emission layers 230a, 230b, 230c, and 230d emitting red (R) light. 1 ,tb 2 ,tb 3 and tb 4 The color of the change changes, and this corresponds to the change in the concentration of red G. Fig. 10A As described, according to the illustrated embodiment, the thickness tb may be formed differently according to the amount by which the angles θ1, θ2, θ3, and θ4 between the imaginary line l extending from the non-bending area NBA and the tangent line l′ of a point on the upper surface of any one of the first bending area BA1 and the second bending area BA2 increase. 4 ,tb 3 ,tb 2 and tb 1 , and in this case, the movement is performed in direction -c.

[0187] By adjusting the color change in directions b and c according to the illustrated exemplary embodiment, the colors perceived in the first and second bending areas BA1 and BA2 may be adjusted to be located near the origin O. Thus, white (W) light may be perceived, and the change in color perceived as yellow Y may be improved and / or reduced.

[0188] Fig.12 It is along Figure 5 Schematic cross-sectional views taken along line III-III′ and line IV-IV′ of FIG. 1 illustrate still another exemplary embodiment of a display panel.

[0189] refer to Fig.12 , the display device may further include a thin film encapsulation layer 300 on the organic light emitting diode OLED and the organic light emitting diode OLED′.

[0190] The organic light emitting diode OLED and the organic light emitting diode OLED' may be easily damaged due to external moisture or oxygen, and therefore may be covered and protected by the thin film encapsulation layer 300. The thin film encapsulation layer 300 may cover the display area DA and may extend to the outside of the display area DA. The thin film encapsulation layer 300 includes at least one organic encapsulation layer and at least one inorganic encapsulation layer. For example, the thin film encapsulation layer 300 may include a first inorganic encapsulation layer 310, an organic encapsulation layer 320, and a second inorganic encapsulation layer 330.

[0191] The first inorganic encapsulation layer 310 may cover the capping layer and may include silicon oxide, silicon nitride and / or silicon trioxynitride. The first inorganic encapsulation layer 310 is formed along its lower structure, and therefore, the upper surface of the first inorganic encapsulation layer 310 is uneven. The organic encapsulation layer 320 may cover the first inorganic encapsulation layer 310, and unlike the first inorganic encapsulation layer 310, the upper surface of the organic encapsulation layer 320 may be substantially flat. In particular, the organic encapsulation layer 320 may have a substantially flat upper surface in the display area DA. The organic encapsulation layer 320 may include one or more materials selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyoxymethylene, polyarylate and HMDSO. The second inorganic encapsulation layer 330 may cover the organic encapsulation layer 320 and may include silicon oxide, silicon nitride and / or silicon trioxynitride.

[0192] Through the multi-layer structure described above, even when a crack occurs in the thin film encapsulation layer 300, the thin film encapsulation layer 300 can prevent the crack from being connected between the first inorganic encapsulation layer 310 and the organic encapsulation layer 320 or between the organic encapsulation layer 320 and the second inorganic encapsulation layer 330. Therefore, the formation of a path through which external moisture or oxygen penetrates into the display area DA can be prevented or reduced.

[0193] According to another exemplary embodiment, a sealing substrate facing the substrate 100 may be arranged. Figure 1 The substrate 100 and the sealing substrate are attached to each other for sealing using a sealing material such as frit in the non-display area NDA shown in FIG.

[0194] As in the illustrated embodiment, the thickness tb of the first functional layer 220 arranged in the first bending area BA1 may be greater than the thickness tc of the second functional layer 220' arranged in the non-bending area NBA, and therefore, the viewing angle in the first bending area BA1 may be adjusted to display white W in the first bending area BA1 as in the non-bending area NBA.

[0195] Although the display device is mainly described above, exemplary embodiments of the present invention are not limited thereto. For example, a display device manufacturing method for manufacturing such a display device may be implemented according to the principles of the present invention.

[0196] Although certain exemplary embodiments and implementations have been described herein, other embodiments and modifications will be apparent from this description. Therefore, the inventive concept is not limited to such embodiments, but rather to the broader scope of the appended claims and various obvious modifications and equivalent arrangements as will be apparent to those of ordinary skill in the art.

Claims

1. A display device, comprising: a substrate comprising a flat region and a curved region extending from the flat region; A first pixel electrode arranged in the arc-shaped area; a first emission layer disposed on the first pixel electrode; a second pixel electrode disposed in the flat region; a second emission layer disposed on the second pixel electrode; a third pixel electrode arranged in the arc-shaped area; a third emission layer disposed on the third pixel electrode; a first functional layer having a first thickness and disposed between the first pixel electrode and the first emission layer; a second functional layer having a second thickness disposed between the second pixel electrode and the second emission layer, and a third functional layer having a third thickness disposed between the third pixel electrode and the third emission layer, wherein the first thickness is greater than the second thickness, Wherein, compared with the first pixel electrode, the third pixel electrode is further away from the flat area, and Wherein, the third thickness is greater than the first thickness.

2. The display device according to claim 1, wherein: The first thickness varies according to an angle between an imaginary line parallel to an upper surface of the flat region and a tangent line at a point on an upper surface of the arc region.

3. The display device according to claim 2, wherein: The first thickness increases as the angle increases.

4. The display device according to claim 1, further comprising: a first auxiliary layer having a first auxiliary thickness disposed between the first functional layer and the first emission layer; as well as a third auxiliary layer having a third auxiliary thickness disposed between the third functional layer and the third emission layer, Wherein, the third auxiliary thickness is smaller than the first auxiliary thickness.

5. The display device according to claim 1, further comprising: a first auxiliary layer having a first auxiliary thickness disposed between the first functional layer and the first emission layer; as well as a second auxiliary layer having a second auxiliary thickness disposed between the second functional layer and the second emitting layer, Wherein, the first auxiliary thickness is smaller than the second auxiliary thickness.

6. The display device according to claim 5, wherein: The first auxiliary thickness varies according to an angle between an imaginary line parallel to an upper surface of the flat region and a tangent line at a point on an upper surface of the arc region.

7. The display device according to claim 6, wherein: The first auxiliary thickness decreases as the angle increases.

8. The display device according to claim 1, wherein: The first functional layer and the second functional layer are integrally formed.

9. The display device according to claim 1, wherein: The first functional layer and the second functional layer include a hole injection layer.

10. A display device, comprising: a substrate comprising a flat region and a curved region extending from the flat region; A first pixel electrode arranged in the arc-shaped area; a first emission layer overlapping the first pixel electrode; a second pixel electrode disposed in the flat region; a second emission layer overlapping the second pixel electrode; a first functional layer disposed between the first pixel electrode and the first emission layer; a second functional layer disposed between the second pixel electrode and the second emission layer; a first auxiliary layer having a first thickness disposed between the first functional layer and the first emission layer; as well as a second auxiliary layer having a second thickness disposed between the second functional layer and the second emission layer, wherein the first emission layer and the second emission layer are configured to emit light of a first color, and Wherein, the first thickness is smaller than the second thickness.

11. The display device according to claim 10, further comprising: a third pixel electrode arranged in the arc-shaped area; a third emission layer overlapping the third pixel electrode; a fourth pixel electrode disposed in the flat area; a fourth emission layer overlapping the fourth pixel electrode; A third functional layer disposed between the third pixel electrode and the third emission layer; a fourth functional layer disposed between the fourth pixel electrode and the fourth emission layer; a third auxiliary layer having a third thickness disposed between the third functional layer and the third emission layer; as well as a fourth auxiliary layer having a fourth thickness disposed between the fourth functional layer and the fourth emission layer, wherein the third emission layer and the fourth emission layer are configured to emit light of a second color different from the first color, and Wherein, the third thickness is smaller than the fourth thickness.

12. The display device according to claim 10, wherein: The first thickness varies according to an angle between an imaginary line parallel to an upper surface of the flat region and a tangent line at a point on an upper surface of the arc region.

13. The display device according to claim 12, wherein: The first thickness decreases as the angle increases.

14. The display device according to claim 11, wherein: The first thickness is smaller than the third thickness.

15. The display device according to claim 11, wherein: The light of the first color has a green wavelength, and the light of the second color has a red wavelength.

16. The display device according to claim 10, further comprising: a third pixel electrode arranged in the arc-shaped area; a third emission layer corresponding to the third pixel electrode; A third functional layer disposed between the third pixel electrode and the third emission layer; as well as a third auxiliary layer having a third thickness disposed between the third functional layer and the third emission layer, wherein the third emitting layer is configured to emit the light of the first color, Wherein, compared with the first pixel electrode, the third pixel electrode is further away from the flat area, and Wherein, the third thickness is smaller than the first thickness.

17. The display device according to claim 10, wherein: The first auxiliary layer and the second auxiliary layer are separated from each other.

18. The display device according to claim 10, wherein: The first functional layer and the second functional layer are integrally formed.

19. A display device comprising: a substrate comprising a flat region and a curved region extending from the flat region; A first pixel electrode arranged in the arc-shaped area; a first emission layer overlapping the first pixel electrode; a second pixel electrode disposed in the flat region; a second emission layer overlapping the second pixel electrode; a third pixel electrode arranged in the arc-shaped area; a third emission layer disposed on the third pixel electrode; a first functional layer disposed between the first pixel electrode and the first emission layer; a second functional layer disposed between the second pixel electrode and the second emission layer, and A third functional layer is provided between the third pixel electrode and the third emission layer, wherein the first emission layer, the second emission layer and the third emission layer are configured to emit light of the same color, Wherein, compared with the first pixel electrode, the third pixel electrode is further away from the flat area, and The first functional layer, the second functional layer and the third functional layer have different thicknesses.

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