Display device and electronic device including the same

Abstract

A display device and an electronic device including the same are provided. The display device includes a display panel and a window disposed on the display panel, in which the display panel includes: a circuit element layer; a display element layer disposed on the circuit element layer and including a light emitting element; an encapsulation layer disposed on the display element layer; a first delayer disposed on the encapsulation layer; a first inorganic layer disposed on the first retarder; and a second inorganic layer disposed on the first inorganic layer, in which a ratio of oxygen atoms contained in the first inorganic layer is smaller than a ratio of oxygen atoms contained in the second inorganic layer.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2024-0052006, filed on April 18, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] Disclosed herein relates to a display panel and a display device including the same, and more particularly, to a display panel having more improved transmittance and reflectance and a display device including the same to improve emission characteristics. BACKGROUND

[0003] Various display devices for multimedia devices such as televisions, mobile phones, desktop computers, navigation systems, game consoles, wearable devices are being developed. Such a display device can include a display panel that displays an image. The display panel can use a so-called self-emitting display element that implements display by including a light-emitting material containing an organic compound or a quantum dot in an emission layer disposed between electrodes facing each other and emitting light through the light-emitting material.

[0004] As the demand for high definition and portability of multimedia electronic devices increases, there is a demand for a display device capable of displaying high-resolution display quality while being miniaturized. SUMMARY

[0005] Disclosed provides a display panel having improved reliability.

[0006] Disclosed also provides a high-resolution display device having excellent display quality.

[0007] However, embodiments are not limited to those set forth herein. The above and other embodiments will become more apparent to one of ordinary skill in the art to which the disclosure pertains by referencing the detailed description of the disclosure given below.

[0008] Embodiments provide a display device including a display panel and a window disposed on the display panel, wherein the display panel includes a circuit element layer, a display element layer disposed on the circuit element layer and including a light-emitting element, an encapsulation layer disposed on the display element layer, a first retarder disposed on the encapsulation layer, a first inorganic layer disposed on the first retarder, and a second inorganic layer disposed on the first inorganic layer, wherein a ratio of oxygen atoms contained in the first inorganic layer is less than a ratio of oxygen atoms contained in the second inorganic layer.

[0009] In embodiments, a refractive index of the first inorganic layer can be greater than a refractive index of the second inorganic layer.

[0010] In an embodiment, the first inorganic layer can include silicon nitride, and the second inorganic layer includes silicon oxynitride.

[0011] In an embodiment, the first inorganic layer can be disposed directly on the first retarder, and the second inorganic layer can be disposed directly on the first inorganic layer.

[0012] In an embodiment, a residual stress of the first inorganic layer can be greater than a residual stress of the second inorganic layer.

[0013] In an embodiment, a first thickness of the first retarder can be greater than a sum of a second thickness of the first inorganic layer and a third thickness of the second inorganic layer.

[0014] In an embodiment, the first thickness can be in a range of about 0.5 µm to about 2.5 µm.

[0015] In an embodiment, the second thickness can be in a range of about 0.1 µm to about 0.8 µm.

[0016] In an embodiment, the third thickness can be in a range of about 0.1 µm to about 0.5 µm.

[0017] In an embodiment, the second thickness can be equal to or greater than the third thickness.

[0018] In an embodiment, the first retarder can include a liquid crystal layer, and the liquid crystal layer can have a curing degree of about 70% or more and about 90% or less.

[0019] In an embodiment, the first retarder can have a phase difference of about 100 nm or more and about 500 nm or less at a wavelength of about 550 nm.

[0020] In an embodiment, a Young's modulus of the first retarder can be in a range of about 0.1 GPa to about 3 GPa.

[0021] In an embodiment, the encapsulation layer can include a first encapsulation inorganic layer disposed on the display element layer, an encapsulation organic layer disposed on the first encapsulation inorganic layer, and a second encapsulation inorganic layer disposed on the encapsulation organic layer.

[0022] In an embodiment, the first retarder can be disposed directly on the second encapsulation inorganic layer.

[0023] In an embodiment, the display device can further include an optical layer disposed between the display panel and the window, wherein the optical layer can include a second retarder disposed on the second inorganic layer and a polarizing layer disposed on the second retarder.

[0024] In an embodiment, the optical layer can further include a color filter layer disposed between the second inorganic layer and the second retarder.

[0025] In an embodiment, the polarizing layer may include a wire grid polarizing plate.

[0026] In an embodiment, the second retarder may include a λ / 4 phase difference retarder.

[0027] In an embodiment, a display panel includes: a circuit element layer; a display element layer, which is arranged on the circuit element layer and includes a light-emitting element; an encapsulation layer, which is arranged on the display element layer; a first retarder, which is arranged on the encapsulation layer; a first inorganic layer, which is arranged on the first retarder and includes silicon nitride; and a second inorganic layer, which is arranged on the first inorganic layer and includes silicon oxynitride.

[0028] In an embodiment, an electronic device may include a display device, the display device including a display panel and a window arranged on the display panel, wherein the display panel may include: a circuit element layer; a display element layer, arranged on the circuit element layer and including a light-emitting element; an encapsulation layer, arranged on the display element layer; a first retarder, arranged on the encapsulation layer; a first inorganic layer, arranged on the first retarder; and a second inorganic layer, arranged on the first inorganic layer, and the ratio of oxygen atoms contained in the first inorganic layer is less than the ratio of oxygen atoms contained in the second inorganic layer.

[0029] The refractive index of the first inorganic layer may be greater than the refractive index of the second inorganic layer.

[0030] The residual stress of the first inorganic layer may be greater than the residual stress of the second inorganic layer.

[0031] The first thickness of the first retarder may be greater than the sum of the second thickness of the first inorganic layer and the third thickness of the second inorganic layer.

[0032] The encapsulation layer may include a first encapsulation inorganic layer disposed on the display element layer, an encapsulation organic layer disposed on the first encapsulation inorganic layer, and a second encapsulation inorganic layer disposed on the encapsulation organic layer.

[0033] The electronic device is at least one of a flat panel display, a curved display, a computer monitor, a medical monitor, a television, a billboard, an interior light, an exterior light, an interior signal light, an exterior signal light, a signal light, a head-up display, a fully transparent display, a partially transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a phone, a mobile phone, a tablet computer, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a microdisplay, a three-dimensional (3D) display, a virtual reality display, an augmented reality display, a vehicle, a video wall having multiple displays stitched together, a theater screen, a stadium screen, a light therapy device, and a sign. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of the specification. The drawings illustrate embodiments and, together with the specification, serve to explain principles of the application. In the drawings: FIG. 1A is a schematic perspective view of an electronic device according to an embodiment; FIG. 1B is an exploded schematic perspective view of an electronic device according to an embodiment; FIG. 2A is a schematic perspective view of an electronic device according to an embodiment; FIG. 2B is an exploded schematic perspective view of an electronic device according to an embodiment; FIG. 3 is a schematic plan view of a display device according to an embodiment; FIG. 4 is a schematic plan view showing a portion of a display device according to an embodiment; FIG. 5 is a schematic cross-sectional view showing a portion of a display device according to an embodiment; FIG. 6 is a schematic cross-sectional view of a light emitting element according to an embodiment; FIG. 7 is a schematic cross-sectional view showing a portion of a display panel according to an embodiment; and FIG. 8 is a schematic cross-sectional view showing a portion of a display device according to an embodiment. DETAILED DESCRIPTION

[0035] In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of various embodiments or implementations of the application. As used herein, "embodiment" and "implementation" are interchangeable words that refer to non-limiting examples of the apparatus or method disclosed herein. It will be apparent, however, that various embodiments can be practiced without these specific details, or with one or more equivalent arrangements. In other instances, well-known structures and functions have not been described in detail in order to avoid obscuring the application. In addition, various embodiments need not always exhibit all advantages since one advantage can in some instances conflict with other advantages.

[0036] Unless otherwise indicated, the illustrated embodiments will be understood to provide features of the application. As such, unless otherwise indicated, features, components, modules, layers, films, panels, regions, and / or aspects of various embodiments (hereinafter referred to collectively as "elements") can be additionally combined, separated, interchanged, and / or rearranged without departing from the scope of the application.

[0037] The use of cross-hatching and / or shading in the drawings is generally provided to illustrate the boundaries and / or junctions of elements of the drawings. As such, the presence of cross-hatching or shading in one area of a drawing does not preclude the presence or functionality of the same or similar cross-hatching or shading in another area of the same or different drawing. Unless otherwise stated, the presence or absence of cross-hatching or shading is not intended to convey any preference or requirement for particular materials, material properties, dimensions, ratios, commonalities between illustrated elements, or any other characteristic, attribute, property, or the like. Moreover, the size and relative sizes of the elements in the drawings are intended to be illustrative of a relationship of the elements to each other and are not intended to represent the precise, actual dimensions, or ratio as can be employed, for example, in block diagrams. Where the embodiments can be practiced differently, a particular process sequence can be performed in an order other than the described sequence. For example, two consecutively described processes can be performed at substantially the same time or in the reverse order of the described sequence. Moreover, like reference numerals denote like elements throughout.

[0038] When an element or layer is referred to as being “on”, “connected to”, or “coupled to” another element or layer, it can be directly on, directly connected to, or directly coupled to the other element or layer, or one or more intervening elements or layers can be present. In contrast, when an element or layer is referred to as being “directly on”, “directly connected to”, or “directly coupled to” another element or layer, there are no intervening elements or layers present. In this regard, the term “connected” can refer to physical, electrical, and / or fluidic connectivity with or without intervening elements. Moreover, the axis of the first direction DR1, the axis of the second direction DR2, and the axis of the third direction DR3 are not limited to the three axes of a Cartesian coordinate system, such as the X-axis, the Y-axis, and the Z-axis, and can be interpreted in a broader sense. For example, the axis of the first direction DR1, the axis of the second direction DR2, and the axis of the third direction DR3 can be perpendicular to each other, or can represent different directions that are not perpendicular to each other. For the purposes of the present disclosure, “at least one of A and B” can be understood to mean only A, only B, or any combination of A and B. Moreover, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” can be interpreted to mean only X, only Y, only Z, or any combination of two or more of X, Y, and Z. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0039] Although the terms “first”, “second”, etc. can 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. Thus, a first element discussed below could be termed a second element without departing from the teachings of the disclosure.

[0040] For descriptive purposes, spatially relative terms such as "below," "beneath," "beneath," "down," "above," "upper," "on," "side" (e.g., as in "sidewall"), etc., may be used herein to describe the relationship of one element to another (other) element as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the drawings is turned over, an element described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the term "below" can include both an above and a below orientation. Moreover, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and as such, the spatially relative descriptors used herein should be interpreted accordingly.

[0041] The terms used herein are for the purpose of describing specific embodiments and are not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are also intended to include the plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, the description indicates the presence of the stated features, wholes, steps, operations, elements, components and / or their groups, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their groups. It should also be noted that, as used herein, the terms "substantially", "approximately" and other similar terms are used as approximate terms rather than as terms of degree, and are used to explain the inherent deviations of measured values, calculated values ​​and / or provided values ​​that will be recognized by those of ordinary skill in the art.

[0042] Various embodiments are described herein with reference to cross-sectional views and / or exploded views that are schematic diagrams of embodiments and / or intermediate structures. As such, variations in the shapes of the illustrations due to, for example, manufacturing techniques and / or tolerances are to be expected. Therefore, the embodiments disclosed herein should not be construed as being limited to the specific illustrated shapes of the regions, but rather will include deviations in shapes due to, for example, manufacturing. In this manner, the regions illustrated in the accompanying drawings may be schematic in nature, and the shapes of these regions may not reflect the actual shapes of the regions of the device and, as such, are not necessarily intended to be limiting.

[0043] As is customary in the art, some embodiments are described and illustrated in the accompanying drawings in terms of functional blocks, units, and / or modules. Those skilled in the art will appreciate that these blocks, units, and / or modules are physically implemented using electronic (or optical) circuitry (such as logic circuits, discrete components, microprocessors, hard-wired circuits, memory elements, wiring connections, etc.) that can be formed using semiconductor-based or other manufacturing technologies. Where the blocks, units, and / or modules are implemented using a microprocessor or other similar hardware, they can be programmed and controlled using software (e.g., microcode) for performing the various functions discussed herein, and can optionally be driven by firmware and / or software. It is also contemplated that each block, unit, and / or module can be implemented using dedicated hardware, or as a combination of dedicated hardware for performing some functions and a processor (e.g., one or more programmed microprocessors and associated circuitry) for performing other functions. Furthermore, each block, unit, and / or module of some embodiments can be physically separated into two or more interacting and discrete blocks, units, and / or modules without departing from the scope of the invention. Furthermore, the blocks, units and / or modules of some embodiments may be physically combined into more complex blocks, units and / or modules without departing from the scope of the invention.

[0044] Hereinafter, a display panel according to an embodiment and a display device according to an embodiment will be described with reference to the accompanying drawings.

[0045] FIG. 1A is a schematic perspective view of an electronic device according to an embodiment. FIG. 1B is an exploded schematic perspective view of an electronic device according to an embodiment. FIG. 2A is a schematic perspective view of an electronic device according to an embodiment. FIG. 2B is an exploded schematic perspective view of an electronic device according to an embodiment.

[0046] The electronic devices EA-1 and EA-2 according to embodiments can be devices that are activated according to an electrical signal to display an image. For example, the electronic devices EA-1 and EA-2 can be a flat display, a curved display, a computer monitor, a medical monitor, a television, a billboard, an indoor light, an outdoor light, an indoor signal light, an outdoor signal light, a signal light, a head-up display, a full transparent display, a partial transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a telephone, a mobile phone, a tablet, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro display, a three-dimensional (3D) display, a virtual reality display, an augmented reality display, a vehicle, a video wall having a plurality of displays spliced together, a theater screen, a stadium screen, a light therapy device, a signboard, or the like. Embodiments of the electronic devices EA-1 and EA-2 are illustrative, and are not limited to any one embodiment without departing from the spirit.

[0047] FIG. 1A and FIG. 1B It is shown that the electronic device EA-1 according to an embodiment is an example of a smartphone. FIG. 2A and FIG. 2B It is shown that the electronic device EA-2 according to an embodiment is an example of a wearable display device.

[0048] Each of the electronic devices EA-1 and EA-2 according to embodiments can be rigid or flexible. "Flexible" refers to a property of being able to bend. For example, the flexible electronic devices EA-1 and EA-2 can include a bendable device, a rollable device, or a foldable device.

[0049] In FIG. 1A and in the following drawings, an axis of a first direction DR1, an axis of a second direction DR2, and an axis of a third direction DR3 are shown, and the directions indicated by the axis of the first direction DR1, the axis of the second direction DR2, and the axis of the third direction DR3 described in the specification can be converted into other directions as a relative concept. The directions indicated by the axis of the first direction DR1, the axis of the second direction DR2, and the axis of the third direction DR3 can be defined as the first direction DR1, the second direction DR2, and the third direction DR3, and the same reference numerals can be used. In the description, the first direction DR1 and the second direction DR2 can be perpendicular to each other. The third direction DR3 can be a normal direction with respect to a plane defined by the first direction DR1 and the second direction DR2.

[0050] In FIG. 1A and FIG. 1BIn the description, the thickness direction can be defined based on the third direction DR3, which is a direction with respect to a normal direction of a plane defined by the first direction DR1 and the second direction DR2. In the description, a front (or top) surface and a rear (or bottom) surface of a member constituting the electronic device EA-1 can be defined based on the third direction DR3. The front (or top) surface and the rear (or bottom) surface of each member constituting the electronic device EA-1 can face each other in the third direction DR3, and a normal direction of each of the front surface and the rear surface can be substantially parallel to the third direction DR3. An interval distance between the front surface and the rear surface defined in the third direction DR3 can correspond to a thickness of the member.

[0051] In the description, "in a plan view" can be defined as a state when viewed in the third direction DR3. In the description, "in a cross-sectional view" can be defined as a state when viewed in the first direction DR1 or the second direction DR2. The directions indicated as the first direction DR1, the second direction DR2, and the third direction DR3 can be relative concepts, and thus can be changed to different directions.

[0052] Referring to FIG. 1A and FIG. 1B , the electronic device EA-1 according to an embodiment can display an image IM through a display surface FS. The image IM can include a still image and a dynamic image. In FIG. 1A , a clock and an icon are illustrated as examples of the image IM. The display surface FS on which the image IM is displayed can correspond to a front surface of the electronic device EA-1.

[0053] Referring to FIG. 1B , the electronic device EA-1 according to an embodiment can include a window module WM, a display device DD, and a housing HAU. The window module WM and the housing HAU can be combined with each other to define an appearance of the electronic device EA-1.

[0054] The window module WM can be disposed on the display device DD to protect the display device DD from external impact or scratches. The window module WM can cover an entire outside of the display device DD. A front surface of the window module WM can define a display surface FS of the electronic device EA-1. The display surface FS can include a transmissive area TA and a bezel area BZA. The transmissive area TA can be an optically transparent area. For example, the transmissive area TA can be an area having a visible light transmittance of about 90% or more.

[0055] The bezel area BZA of the window module WM can be an area having a light transmittance that is relatively smaller than that of the transmissive area TA. The bezel area BZA can define the shape of the transmissive area TA. The bezel area BZA can be disposed adjacent to the transmissive area TA to surround the transmissive area TA. However, this is merely an example. For example, in another embodiment, the bezel area BZA can be omitted.

[0056] In an embodiment, the window module WM can include a base material that is an optically transparent insulating material. The base material can include at least one of a glass material and a synthetic resin film. The base material can have a single layer structure or a multi-layer structure in which films are combined with each other. The window module WM can include a reflection reduction layer disposed on the base material. For example, the reflection reduction layer can include a polarizing layer. For example, the window module WM can further include a functional layer such as an anti-fingerprint layer, a phase control layer, or a hard coat layer.

[0057] The window module WM can further include an adhesive layer. The base material and the display device DD can be combined with each other by the adhesive layer. However, embodiments are not limited thereto. For example, the adhesive layer can be omitted, and the window module WM can be disposed (e.g., directly disposed) on the display device DD.

[0058] The display device DD can be disposed below the window module WM. The display device DD can generate an image IM. The image IM generated by the display device DD can be displayed on a display surface IS of the display device DD and can be visible to a user from the outside through the transmissive area TA.

[0059] The display device DD can include a display area DA and a non-display area NDA. The display area DA can be an area that is activated according to an electrical signal. The non-display area NDA is adjacent to the display area DA. The non-display area NDA can surround the display area DA. The non-display area NDA can be an area covered by the bezel area BZA and can not be visible from the outside.

[0060] The housing HAU can be combined to the window module WM. The housing HAU can be combined to the window module WM to provide an internal space. The display device DD can be accommodated in the internal space of the housing HAU.

[0061] The housing HAU can include a material having a relatively high rigidity. For example, the housing HAU can include glass, plastic, or metal, or can include a frame and / or a plate made of a combination of glass, plastic, and metal. The housing HAU can stably protect components of the electronic apparatus EA-1 accommodated in the internal space from external impacts.

[0062] Referring to FIG. 1BAccording to an embodiment, the display device DD can include a display panel DP and an optical control panel (or optical control panel) OP. For example, the electronic device EA-1 according to an embodiment can further include a protective member disposed on a bottom surface of the display panel DP or an input sensor disposed on the display panel DP. For example, the input sensor can sense an external input using a capacitive method, or can sense an external input using an electromagnetic induction method or a pressure sensing method.

[0063] In FIG. 2A and FIG. 2B , the electronic device EA-2 according to an embodiment can be a device activated according to an electrical signal, and can be a wearable device. The wearable device can be a device worn on a user's body, and can include a head-mounted display (HMD) that implements extended reality (XR). FIG. 2A and FIG. 2B It is shown that the electronic device EA-2 is an example of a head-mounted display, but embodiments are not limited thereto.

[0064] In FIG. 2A and FIG. 2B , the electronic device EA-2 according to an embodiment can be a display device worn on a user's head. The electronic device EA-2 can provide an image in a state of blocking a user's actual peripheral vision. A user wearing the electronic device EA-2 can more easily immerse in virtual reality.

[0065] The electronic device EA-2 can include a main body part HS, a strap part STR, a cushion part PP, and a display device DD. For example, the electronic device EA-2 can include various sensors and cameras.

[0066] The main body part HS can be worn on a user's head. A display device DD that displays an image and an acceleration sensor can be accommodated inside the main body part HS. The acceleration sensor can sense a user's movement to transmit a selected signal to the display device DD. Accordingly, the display device DD can provide an image corresponding to a change in a user's line of sight. Accordingly, a user can experience virtual reality similar to actual reality. The display device DD can include a display panel DP (see FIG. 1B ) and an optical control panel OP (see FIG. 1B ) as described with reference to FIG. 1B . However, embodiments are not limited thereto, and the configuration of the display device DD included in the electronic device EA-2 according to an embodiment can be set to include a configuration different from that shown in FIG. 1B to suit the characteristics of a wearable device.

[0067] In the body portion HS, components having various functions other than the above-described functions can be accommodated. For example, a manipulation portion that adjusts a volume or a screen brightness can be additionally provided outside the body portion HS. The manipulation portion can be provided as a physical button or can be provided in the form of a touch sensor. For example, a proximity sensor that determines whether a user wears the device can be accommodated in the body portion HS. For example, an external display panel can be further provided on the body portion HS.

[0068] The body portion HS can be divided into a main body HS-1 and a cover HS-2. FIG. 2B An example in which the body portion HS is divided into the main body HS-1 and the cover HS-2 is illustrated, but embodiments are not limited thereto. For example, the main body HS-1 and the cover HS-2 can be provided as one body, and thus can not be separated from each other.

[0069] The display devices DD can be provided between the main body HS-1 and the cover HS-2. Each of the display devices DD can provide an image through a display area DA. Each of the display devices DD can include a non-display area NDA surrounding the display area DA. In another embodiment, the non-display area NDA can be placed only at one side of the display area DA, or the non-display area NDA can be omitted.

[0070] In FIG. 2B In the above-described embodiment, an example in which a left-eye image and a right-eye image are provided by display devices DD that are separated from each other is illustrated, but embodiments are not limited thereto. For example, the left-eye image and the right-eye image can be displayed through a single display device. The display devices DD can be driven by separate driving portions, respectively. However, embodiments are not limited thereto, and the display devices DD can be driven by a single driving portion. The display devices DD can generate images corresponding to input image data.

[0071] The strap portion STR can be coupled to the body portion HS so that the body portion HS can be easily worn by a user. The strap portion STR can include a main strap STR1 and an upper strap STR2.

[0072] The main strap STR1 can be worn along an outer periphery of a user's head. The main strap STR1 can fix the body portion HS to a user so that the body portion HS can be in close contact with the user's head. The upper strap STR2 can connect the body portion HS to the main strap STR1 along a top of the user's head. The upper strap STR2 can prevent the body portion HS from falling. For example, the upper strap STR2 can distribute a load on the body portion HS to further improve a wearing comfort of a user.

[0073] If the body portion HS is fixed to a user, the strap portion STR can be modified to be other than FIG. 2AVarious shapes other than the shape shown in the middle can be used. For example, in another embodiment, the upper strap STR2 can be omitted. In another embodiment, the strap portion STR can be modified to various forms, such as a headband combined to the body portion HS or a temple leg combined to the body portion HS.

[0074] A cushion portion PP can be disposed between the body portion HS and the user's head. The cushion portion PP can be made of a material that is freely deformable or variously deformable in its shape. For example, the cushion portion PP can be made of a polymer resin (e.g., polyurethane, polycarbonate, polypropylene, and polyethylene), or a sponge made of a rubber fluid, a urethane-based material, or by foaming and molding an acrylic material. However, embodiments are not limited thereto.

[0075] The cushion portion PP can allow the body portion HS to be in close contact with the user, thereby improving the wearing comfort of the user. The cushion portion PP can be detached from the body portion HS. In another embodiment, the cushion portion PP can be omitted.

[0076] An optical system OL can be disposed inside the body HS-1 of the body portion HS. The optical system OL can magnify an image provided from the display device DD. Each of the display devices DD can display an image in a third direction DR3 through a display area DA parallel to a first direction DR1 and a second direction DR2 intersecting the first direction DR1. The optical system OL can be disposed to be spaced apart from the display device DD in the third direction DR3. The optical system OL can be disposed between the display device DD and the user's eyes. The optical system OL can include a right-eye optical system OL_R and a left-eye optical system OL_L. The left-eye optical system OL_L can magnify an image and provide the image to the user's left pupil, and the right-eye optical system OL_R can magnify an image and provide the image to the user's right pupil.

[0077] The left-eye optical system OL_L and the right-eye optical system OL_R can be disposed to be spaced apart from each other in the first direction DR1. A distance between the right-eye optical system OL_R and the left-eye optical system OL_L can be adjusted to correspond to a distance between the user's two eyes. For example, a distance between the optical system OL and the display device DD can be adjusted according to the user's eyesight.

[0078] The optical system OL can be a convex aspherical lens. For example, the optical system OL can be a pancake lens, but embodiments are not limited thereto. In this embodiment, an example in which each of the left-eye optical system OL_L and the right-eye optical system OL_R is disposed as a single lens is shown, but embodiments are not limited thereto. For example, each of the left-eye optical system OL_L and the right-eye optical system OL_R can include a plurality of lenses.

[0079] In FIG. 2Aand FIG. 2B The electronic device EA-2 according to the embodiment shown in FIG. 1A can further include a window member disposed on the display device DD. The window member can include a base material and a reflection reduction layer.

[0080] Referring to FIGS. 1A-2B The display device DD included in each of the electronic devices EA-1 and EA-2 described according to the embodiment can include an organic light emitting display panel, an inorganic light emitting display panel, and an organic-inorganic light emitting display panel, a quantum dot display panel, a micro-LED display panel, or a nano-LED display panel. In this embodiment, an example in which the display device DD includes an organic light emitting display panel is shown, but the embodiment is not limited thereto. The display device DD included in each of the electronic devices EA-1 and EA-2 according to the embodiment can have a high resolution characteristic. For example, the display device DD according to the embodiment can have an ultra-high resolution display quality with 3000 ppi or more. Accordingly, a pixel electrode (or a first electrode) of a light emitting element ED1, ED2, and ED3 (see FIG. 5 ) constituting the display device DD included according to the embodiment can be disposed to have a fine pattern with high precision.

[0081] FIG. 3 is a schematic plan view of a display device according to an embodiment. The display device DD can include a base substrate BL divided into a display area DA and a non-display area NDA.

[0082] The display device DD can include pixels PX disposed in the display area DA and a signal line SGL electrically connected to the pixels PX. The display device DD can include a driving circuit GDC and a pad (or referred to as a "land") portion PLD disposed in the non-display area NDA.

[0083] The pixels PX can be arranged in a first direction DR1 and a second direction DR2. The pixels PX can include a pixel row extending in the first direction DR1 and arranged in the second direction DR2 and a pixel column extending in the second direction DR2 and arranged in the first direction DR1.

[0084] The signal line SGL can include a gate line GLL, a data line DL, a power line PL, and a control signal line CSL. Each of the gate lines GLL can be connected to a corresponding pixel of the pixels PX, and each of the data lines DL can be connected to a corresponding pixel of the pixels PX. The power line PL can be electrically connected to the pixels PX. The control signal line CSL can be connected to the driving circuit GDC to provide a control signal to the driving circuit GDC.

[0085] The drive circuit GDC can include a gate drive circuit. The gate drive circuit can generate a gate signal and sequentially output the generated gate signal to the gate lines GLL. The gate drive circuit can also output another control signal to the pixel drive circuit.

[0086] The pad portion PLD can be a portion connected to the flexible circuit board. The pad portion PLD can include the pixel pads D-PD, and the pixel pads D-PD can be pads connecting the flexible circuit board to the display panel DP. Each of the pixel pads D-PD can be connected to a corresponding signal line of the signal lines SGL. The pixel pads D-PD can be connected to corresponding pixels PX through the signal lines SGL, respectively. For example, any one of the pixel pads D-PD can be connected to the drive circuit GDC.

[0087] FIG. 4 is a schematic plan view showing a portion of a display device according to an embodiment. FIG. 4 A portion of a display area DA (see FIG. 1B ) when viewed on a display surface IS (see FIG. 1B ) of a display device DD (see FIG. 1B ). FIG. 4 An arrangement of emission areas PXA-B, PXA-G, and PXA-R in a display device DD (see FIG. 1B ) according to an embodiment is shown.

[0088] A display device DD according to an embodiment can include emission areas PXA-B, PXA-G, and PXA-R spaced apart from each other in a plan view and a peripheral area NPXA disposed between the emission areas PXA-B, PXA-G, and PXA-R.

[0089] A display device DD according to an embodiment can include three types of emission areas PXA-B, PXA-G, and PXA-R distinguished from each other. In an embodiment, FIG. 4 The three types of emission areas PXA-B, PXA-G, and PXA-R shown in may be repeatedly disposed throughout the display area DA. The emission areas PXA-B, PXA-G, and PXA-R can also be referred to as pixel areas.

[0090] The display area DA can emit light having different wavelength ranges and can include a first emission area PXA-B, a second emission area PXA-G, and a third emission area PXA-R spaced apart from each other in a plan view. For example, the display area DA can include a peripheral area NPXA. The peripheral area NPXA can be referred to as a non-emission area.

[0091] The peripheral area NPXA can be disposed around the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R. The peripheral area NPXA can set a boundary between the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R. The peripheral area NPXA can surround the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R. Accordingly, a structure (e.g., a pixel definition layer PDL (see FIG. 5 )) that prevents color mixing between the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can be disposed in the peripheral area NPXA.

[0092] The first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can correspond to areas that emit light provided from the light emitting elements ED1, ED2, and ED3 (see FIG. 5 ), respectively. The first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can be distinguished according to colors of light emitted toward the outside of the display device DD (see FIG. 1B ).

[0093] The first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can provide first color light, second color light, and third color light having different colors. For example, the first color light can be blue light, the second color light can be green light, and the third color light can be red light. However, examples of the first color light, the second color light, and the third color light are not necessarily limited thereto.

[0094] Each of the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can correspond to an area in which a top surface of each of the first electrode AE1, the second electrode AE2, and the third electrode AE3 (see FIG. 5 ) of the light emitting elements ED1, ED2, and ED3 is exposed through the light emission opening OH to be described later. In an embodiment, each of the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can be defined as an area between the pixel definition layers PDL (see FIG. 5 ) that define the light emission opening OH (see FIG. 5 ). For example, in an embodiment, the emission areas PXA-B, PXA-G, and PXA-R can be defined as areas that protrude most toward the light emission opening OH (see FIG. 5 ) between the pixel definition layers PDL (see FIG. 5 ).

[0095] Each of the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can be provided in plural, and can be repeatedly provided within the display area DA in a selected arrangement. For example, the first emission area PXA-B can be arranged along the first direction DR1 to constitute a "first group". The second emission area PXA-G and the third emission area PXA-R can be alternately arranged along the first direction DR1 to constitute a "second group". Each of the "first group" and the "second group" can be provided in plural, and the "first group" and the "second group" can be alternately arranged along the second direction DR2.

[0096] FIG. 4 An example of an arrangement of the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R is illustrated, but embodiments are not limited thereto. For example, the emission areas can be arranged in various shapes. In an embodiment, the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can have a PENTILE ® arrangement. In another example, the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can have a stripe arrangement or a diamond (e.g., Diamond Pixel ® ) arrangement.

[0097] The first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can have various shapes in a plan view. For example, the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can have a polygonal shape, a circular shape, or an elliptical shape. In FIG. 4 , an example in which the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R have a rectangular shape in a plan view is illustrated.

[0098] The first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can have the same shape in a plan view, or at least a portion of the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R can have different shapes. FIG. 4 A case in which the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R have the same shape in a plan view is illustrated.

[0099] At least a portion of the first emission region PXA-B, the second emission region PXA-G, and the third emission region PXA-R may have different surface areas in a plan view. In an embodiment, the surface area of ​​the first emission region PXA-B that emits blue light may be greater than the surface area of ​​each of the second emission region PXA-G that emits green light and the third emission region PXA-R that emits red light. However, the size relationship between the surface areas of the first emission region PXA-B, the second emission region PXA-G, and the third emission region PXA-R according to the emission color is not limited thereto and may vary according to the design of the display device DD according to the embodiment. The embodiment is not limited thereto, and the first emission region PXA-B, the second emission region PXA-G, and the third emission region PXA-R may have the same surface area in a plan view.

[0100] The shapes, surface areas, and arrangements of the first emission region PXA-B, the second emission region PXA-G, and the third emission region PXA-R in the display device DD according to the embodiment may be determined based on the color of emitted light or included in the electronic devices EA-1 and EA-2 (see FIG. FIG. 1A and FIG. 2A ) The size and structure of the display device DD in the embodiment are variously designed, but the embodiment is not limited to FIG. 4 For example, in an embodiment, the display device DD may further include an emission area emitting white light in addition to the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R.

[0101] FIG. 5 is a schematic cross-sectional view showing a display device according to an embodiment. FIG. 5 It is along FIG. 4 Schematic cross-sectional view taken along line II'.

[0102] The display device DD according to the embodiment may include a display panel DP and a light control panel (eg, optical control panel) OP disposed on the display panel DP.

[0103] The display panel DP may include first, second, and third emission regions PXA-B, PXA-G, and PXA-R that are distinguished from each other and a peripheral region NPXA disposed therebetween.

[0104] The display panel DP can include a base substrate BL, a circuit element layer D-CL disposed on the base substrate BL, a display element layer D-OL disposed on the circuit element layer D-CL, a sealing layer TFE disposed on the display element layer D-OL, a first retarder RT disposed on the sealing layer TFE, and an inorganic cover layer CP disposed on the first retarder RT.

[0105] The display element layer D-OL can be disposed to correspond to the display area DA (see FIG. 1B and FIG. 2B ). However, embodiments are not limited thereto, and at least a portion of the display element layer D-OL can be disposed in the non-display area NDA (see FIG. 1B and FIG. 2B ).

[0106] The base substrate BL can be a support substrate on which the circuit element layer D-CL and the display element layer D-OL are disposed. The base substrate BL can include a plastic substrate, a glass substrate, a metal substrate, or an organic / inorganic composite substrate. In embodiments, the base substrate BL can be a silicon substrate, a germanium substrate, or a silicon-on-insulator (SOI) substrate. For example, the base substrate BL can be a single-crystal silicon substrate, but embodiments are not limited thereto.

[0107] In the description, the display area DA (see FIG. 1B and FIG. 2B ) and the non-display area NDA (see FIG. 1B and FIG. 2B ) can be considered to be defined on the base substrate BL. For example, components disposed on the base substrate BL can be disposed to be superimposed with the display area DA (see FIG. 1B and FIG. 2B ) and the non-display area NDA (see FIG. 1B and FIG. 2B ).

[0108] The circuit element layer D-CL can include at least one insulating layer and circuit elements. The circuit elements can include signal lines SGL (see FIG. 3 ) and a drive circuit GDC (see FIG. 3 ) of a pixel PX (see FIG. 3 ). The circuit element layer D-CL can be formed by a process of forming insulating layers, semiconductor layers, and conductive layers via coating or deposition, and a process of patterning the insulating layers, semiconductor layers, and conductive layers via a photolithography process.

[0109] The display element layer D-OL can include a pixel definition layer PDL and light emitting elements that are distinguished from the pixel definition layer PDL. The display element layer D-OL can include a first light emitting element ED1, a second light emitting element ED2, and a third light emitting element ED3. The first light emitting element ED1 can emit blue light, the second light emitting element ED2 can emit green light, and the third light emitting element ED3 can emit red light.

[0110] The first light emitting element ED1 can include a first pixel electrode AE1, a first functional layer FL1, and a second electrode CE, the second light emitting element ED2 can include a second pixel electrode AE2, a second functional layer FL2, and the second electrode CE, and the third light emitting element ED3 can include a third pixel electrode AE3, a third functional layer FL3, and the second electrode CE. Each of the first pixel electrode AE1, the second pixel electrode AE2, and the third pixel electrode AE3 can be referred to as a first electrode.

[0111] In an embodiment, the first electrodes AE1, AE2, and AE3 of the first light emitting element ED1, the second light emitting element ED2, and the third light emitting element ED3 can be provided to be patterned to correspond to the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R, respectively.

[0112] In an embodiment, the first functional layer FL1, the second functional layer FL2, and the third functional layer FL3 can be provided as a common layer to overlap the entire emission areas PXA-R, PXA-G, and PXA-B and the entire peripheral area NPXA. In an embodiment, the second electrode CE can be provided as a common layer to overlap the entire emission areas PXA-R, PXA-G, and PXA-B and the entire peripheral area NPXA. However, embodiments are not limited thereto. At least one of the first functional layer FL1, the second functional layer FL2, and the third functional layer FL3 and the second electrode CE can be interrupted and provided to correspond to each of the emission areas PXA-R, PXA-G, and PXA-B.

[0113] The first electrode AE can be an anode or a cathode. For example, the first electrode AE can be a pixel electrode. The second electrode CE can be a cathode or an anode. The second electrode CE can be a common electrode. For example, in the case where the first electrode AE is an anode, the second electrode CE can be a cathode, and in the case where the first electrode AE is a cathode, the second electrode CE can be an anode.

[0114] The functional layer FL can include at least one light emitting structure. The functional layer FL can include at least one organic layer commonly provided in the emission areas PXA-B, PXA-G, and PXA-R (see FIG. 4 ). For example, the functional layer FL can include at least one organic layer commonly provided in the emission areas PXA-B, PXA-G, and PXA-R (seeFIG. 4 ) a common layer of the common setting and an emission layer patterned to correspond to each of the emission regions PXA-B, PXA-G, and PXA-R (see FIG. 4 ). For example, unlike this structure, the functional layer FL can be interrupted in the peripheral region NPXA (see FIG. 4 ) and patterned to correspond to each of the emission regions PXA-B, PXA-G, PXA-R (see FIG. 4 ). The configuration of the functional layer FL of the light emitting elements ED1, ED2, and ED3 will be described later in more detail.

[0115] The light emitting elements ED1, ED2, and ED3 according to the embodiments can further include a cap layer provided on the second electrode CE. The cap layer can include a plurality of layers or a single layer.

[0116] The display element layer D-OL can include a pixel defining layer PDL provided on the circuit element layer D-CL. The light emitting opening OH can be defined in the pixel defining layer PDL. The light emitting opening OH of the pixel defining layer PDL can expose at least a portion of the first electrode AE. In an embodiment, the pixel defining layer PDL can cover an edge of the first electrode AE.

[0117] The pixel defining layer PDL can have a single layer structure or a multi-layer structure. The pixel defining layer PDL can be made of an inorganic material. For example, the pixel defining layer PDL can be made of an inorganic material such as silicon nitride (SiN x ), silicon oxide (SiO x ), or silicon oxynitride (SiO x N y ).

[0118] However, the embodiments are not limited thereto, and the pixel defining layer PDL can be made of a polymer resin. For example, the pixel defining layer PDL can include a polyacrylate-based resin or a polyimide-based resin. For example, the pixel defining layer PDL can include an inorganic material in addition to the polymer resin. The pixel defining layer PDL can include a light absorbing material or can include a black pigment or a black dye. The pixel defining layer PDL including the black pigment or the black dye can implement a black pixel defining layer. In the case of forming the pixel defining layer PDL, carbon black or the like can be used as the black pigment or the black dye, but the embodiments are not limited thereto.

[0119] The encapsulation layer TFE can be provided on the second electrode CE of the light emitting elements ED1, ED2, and ED3. In another example, in the case where the light emitting elements ED1, ED2, and ED3 include the cap layer, the encapsulation layer TFE can be provided on the cap layer. The encapsulation layer TFE can cover the light emitting elements ED1, ED2, and ED3.

[0120] The encapsulation layer TFE can be a thin film encapsulation layer. The encapsulation layer TFE can be provided as a single layer or a laminate in which a plurality of layers are laminated. The encapsulation layer TFE can include a first encapsulation inorganic layer IOL1, an encapsulation organic layer EOL, and a second encapsulation inorganic layer IOL2, which are sequentially laminated. The first encapsulation inorganic layer IOL1 and the second encapsulation inorganic layer IOL2 can protect the light emitting elements ED1, ED2, and ED3 from moisture / oxygen, and the encapsulation organic layer EOL can protect the light emitting elements ED1, ED2, and ED3 from foreign substances such as dust particles. Each of the first encapsulation inorganic layer IOL1 and the second encapsulation inorganic layer IOL2 can include silicon nitride, silicon oxynitride, silicon oxide, titanium oxide, or aluminum oxide, but embodiments are not limited thereto. The encapsulation organic layer EOL can include an acrylic compound, an epoxy compound, or the like. The encapsulation organic layer EOL can include a photopolymerizable organic material, but embodiments are not limited thereto.

[0121] The first retarder RT can be provided to improve optical efficiency. The first retarder RT can be provided (e.g., directly provided) on the second encapsulation inorganic layer IOL2. The inorganic cover layer CP can cover the first retarder RT. The inorganic cover layer CP can be provided (e.g., directly provided) on the first retarder RT. Detailed descriptions of the first retarder RT and the inorganic cover layer CP will be described later in FIG. 7 The light control panel OP can be provided on the display panel DP. The light control panel OP can include a color filter layer CFL, a second retarder QW provided on the color filter layer CFL, and a polarization layer PZ provided on the second retarder QW.

[0122] The color filter layer CFL can include a separation pattern BM and at least one color filter CF1, CF2, or CF3. Each of the color filters CF1, CF2, and CF3 can transmit light having a specific wavelength range and block light having a wavelength range outside the corresponding wavelength range. In an embodiment, the first color filter CF1 can be a blue color filter, the second color filter CF2 can be a green color filter, and the third color filter CF3 can be a red color filter.

[0123] Each of the color filters CF1, CF2, and CF3 can include a polymer photosensitive resin and a colorant. The colorant can include a pigment or a dye. The first color filter CF1 can include a blue pigment or a blue dye, the second color filter CF2 can include a green pigment or a green dye, and the third color filter CF3 can include a red pigment or a red dye. In an embodiment, the first color filter CF1 can not include a pigment or a dye.

[0124] The first color filter CF1, the second color filter CF2, and the third color filter CF3 can be provided to correspond to the first emission area PXA-B, the second emission area PXA-G, and the third emission area PXA-R, respectively.

[0125] Each of the color filters CF1, CF2, and CF3 may be disposed to correspond to an opening defined in the separation pattern BM. The color filters CF1, CF2, and CF3 may transmit light provided by the stacked light-emitting elements ED1, ED2, and ED3, which correspond to the color filters CF1, CF2, and CF3, respectively. The color filters CF1, CF2, and CF3 may improve the color reproducibility of the light provided by the light-emitting elements ED1, ED2, and ED3. For example, light having a specific wavelength range among the light provided by the light-emitting elements ED1, ED2, and ED3 may be transmitted through the color filters CF1, CF2, and CF3.

[0126] and FIG. 5 Unlike that shown in , in an embodiment, the color filter layer CFL may not include a separation pattern, and the color filters CF1, CF2, and CF3 that transmit different lights corresponding to the peripheral area NPXA may be arranged to overlap each other. Corresponding to the peripheral area NPXA, the color filters CF1, CF2, and CF3 may be arranged to overlap each other in the third direction DR3 as the thickness direction so that the boundaries between the adjacent emission areas PXA-B, PXA-G, and PXA-R can be distinguished from each other.

[0127] The material forming the separation pattern BM is not particularly limited as long as it is a material that absorbs light. The separation pattern BM may be a layer having a black color. In an embodiment, the separation pattern BM may include a black colorant. The black colorant may include a black dye and a black pigment. The black colorant may include carbon black, a metal such as chromium, or an oxide thereof.

[0128] For example, the light control panel OP may further include a lens pattern disposed on the upper portion of each of the color filters CF1, CF2, and CF3. The lens pattern may control the direction of light emitted from the light-emitting elements ED1, ED2, and ED3 or improve light extraction efficiency. The lens pattern may have a lens shape and may have a convex shape that protrudes in a direction away from the display panel DP. The lens pattern may be referred to as a microlens.

[0129] An overcoat layer OC may be disposed on the color filter layer CFL. The overcoat layer OC may cover the color filters CF1, CF2, and CF3 and the separation pattern BM. The overcoat layer OC may be made of an organic material including a polymer resin. For example, the overcoat layer OC may be made of an organic resin including an acrylic resin or an epoxy resin. However, the embodiment is not limited thereto.

[0130] The second retarder QW can change a polarization state of light incident into the second retarder QW. The second retarder QW can include a λ / 4 phase difference retarder. The second retarder QW can be an optical layer that delays a phase of provided light by λ / 4. The second retarder QW can be of a film type or a liquid crystal coating type. The film type can include a stretched synthetic resin film, and the liquid crystal coating type can include a base layer and a liquid crystal layer oriented on one surface of the base layer. However, embodiments are not limited thereto, and the liquid crystal coating type can be provided as only the liquid crystal layer without the base layer as a support. The liquid crystal layer can include a reactive liquid crystal monomer (e.g., a rod-like liquid crystal origin exhibiting a nematic liquid crystal phase). In embodiments, the liquid crystal layer can include a photoreactive polymer having a refractive index anisotropy.

[0131] The polarization layer PZ can include a wire grid polarizer (or a wire grid polarizing plate). The wire grid polarizer can include a substrate and a grid line GL provided on the substrate. The grid line GL can be provided as a nanowire made of metal. The grid line GL can be provided at a period shorter than a wavelength of incident light. The wire grid polarizer can be used to convert light provided from the light emitting elements ED1, ED2, and ED3 into polarized light. Light in which an electric field oscillates in a direction parallel to the grid line GL among light passing through the wire grid polarizer can be reflected, and light in which an electric field oscillates in a direction perpendicular to the grid line GL can be transmitted.

[0132] FIG. 6 is a schematic cross-sectional view of a light emitting element according to an embodiment. FIG. 5 Each of the first light emitting element ED1, the second light emitting element ED2, and the third light emitting element ED3 shown in FIG. 1 can have a configuration according to an embodiment. FIG. 6 is a configuration of an embodiment of a light emitting element ED shown in FIG. 1.

[0133] Referring to FIG. 6 The light emitting element ED according to an embodiment can include a first electrode AE, a functional layer FL, and a second electrode CE, and the functional layer FL can include light emitting structures EU-1, EU-2, and EU-3. The light emitting structures EU-1, EU-2, and EU-3 can respectively include emission layers EML-1, EML-2, and EML-3. Thus, the functional layer FL can include the emission layers EML-1, EML-2, and EML-3. For example, the light emitting element ED according to an embodiment can be a light emitting element having a series structure including the emission layers EML-1, EML-2, and EML-3 divided from each other. FIG. 6 A structure in which three light emitting structures EU-1, EU-2, and EU-3 are stacked is shown, but embodiments are not limited thereto. For example, the light emitting element ED can include two light emitting structures stacked, or can include four or more light emitting structures stacked. In embodiments, the number of light emitting structures included in the light emitting element ED can be selected in consideration of a wavelength range of light required for the light emitting element ED.

[0134] In embodiments, the first electrode AE ​​may be made of a metal material, a metal alloy, or a conductive compound. The first electrode AE ​​may be a reflective electrode. The first electrode AE ​​may include Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, W, or compounds or mixtures thereof (e.g., a mixture of Ag and Mg), or a material having a multilayer structure such as LiF / Ca (e.g., a stacked structure of LiF and Ca) or LiF / Al (e.g., a stacked structure of LiF and Al). In another example, the first electrode AE ​​may have a multilayer structure including a reflective layer or a transflective layer and a transparent conductive layer made of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide (ITZO). The first electrode AE ​​of the light-emitting element ED having a multilayer structure according to embodiments will be described in more detail later.

[0135] The second electrode CE may be made of a transparent metal oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide (ITZO).

[0136] The light-emitting element ED may include a first light-emitting structure EU-1, a second light-emitting structure EU-2 disposed on the first light-emitting structure EU-1, and a third light-emitting structure EU-3 disposed on the second light-emitting structure EU-2. A charge generation layer CGL1 may be disposed between the first light-emitting structure EU-1 and the second light-emitting structure EU-2, and a charge generation layer CGL2 may be disposed between the second light-emitting structure EU-2 and the third light-emitting structure EU-3.

[0137] The first light-emitting structure EU-1 may include a first hole transport region HTR-1, a first emission layer EML-1 and a first electron transport region ETR-1, the second light-emitting structure EU-2 may include a second hole transport region HTR-2, a second emission layer EML-2 and a second electron transport region ETR-2, and the third light-emitting structure EU-3 may include a third hole transport region HTR-3, a third emission layer EML-3 and a third electron transport region ETR-3.

[0138] Each of the first hole transport region HTR-1, the second hole transport region HTR-2, and the third hole transport region HTR-3 can include at least one of a hole injection layer, a hole transport layer, an emission auxiliary layer, and an electron blocking layer. For example, each of the first hole transport region HTR-1, the second hole transport region HTR-2, and the third hole transport region HTR-3 can include a hole injection layer and a hole transport layer which are sequentially stacked. In the light emitting element ED according to the embodiment, the first hole transport region HTR-1, the second hole transport region HTR-2, and the third hole transport region HTR-3 can all have the same structure and be made of the same material. However, the embodiment is not limited thereto, and at least one of the first hole transport region HTR-1, the second hole transport region HTR-2, and the third hole transport region HTR-3 can have a stacked structure different from that of the remaining hole transport regions or include a hole transport material different from the hole transport material of the remaining hole transport regions.

[0139] In the embodiment, the first light emitting structure EU-1, the second light emitting structure EU-2, and the third light emitting structure EU-3 of the light emitting element ED can respectively emit light having different wavelength ranges. Thus, the light emitting element ED according to the embodiment can emit light which is a combination of light provided from the light emitting structures EU-1, EU-2, and EU-3. For example, in the display device DD (see FIG. 5 ) according to the embodiment, the first light emitting element ED1, the second light emitting element ED2, and the third light emitting element ED3 can emit light having the same wavelength range, and the light can be filtered by the light control panel OP (see FIG. 5 ) and emitted as light having a wavelength range corresponding to each of the emission regions PXA-B, PXA-G, and PXA-R.

[0140] The first functional layer FL1, the second functional layer FL2, and the third functional layer FL3 (see FIG. 5Each of the first to third emission layers EML-1, EML-2, and EML-3 can include a first emission layer EML-1, a second emission layer EML-2, and a third emission layer EML-3 including different light emitting materials. Each of the first to third emission layers EML-1, EML-2, and EML-3 can emit light having a different wavelength range. Each of the first to third emission layers EML-1, EML-2, and EML-3 can include an auxiliary emission layer for improving light emitting efficiency in addition to a main emission layer including a light emitting material emitting light having a selected color. In an embodiment, each of the first to third emission layers EML-1, EML-2, and EML-3 can have a structure in which sub-emission layers having different light emitting material components are stacked. In the light emitting element ED according to the embodiment, the first to third emission layers EML-1, EML-2, and EML-3 can have the same structure and be made of the same material. However, the embodiment is not limited thereto, and at least one of the first to third emission layers EML-1, EML-2, and EML-3 can have a different stacking structure from the stacking structure of the remaining emission layers or include a different light emitting material from the light emitting materials of the remaining emission layers. For example, each of the first to third emission layers EML-1, EML-2, and EML-3 can include stacked sub-emission layers or auxiliary emission layers.

[0141] Each of the first to third electron transport regions ETR-1, ETR-2, and ETR-3 can include at least one of a hole blocking layer, an electron transport layer, and an electron injection layer. For example, each of the first to third electron transport regions ETR-1, ETR-2, and ETR-3 can include an electron transport layer and an electron injection layer. For example, in the light emitting element ED according to the embodiment, the first to third electron transport regions ETR-1, ETR-2, and ETR-3 can all have the same structure and be made of the same material. However, the embodiment is not limited thereto, and at least one of the first to third electron transport regions ETR-1, ETR-2, and ETR-3 can have a different stacking structure from the stacking structure of the remaining electron transport regions or include a different electron transport material from the electron transport materials of the remaining electron transport regions.

[0142] The light-emitting element ED according to the embodiment can include charge generation layers CGL1 and CGL2. The charge generation layers CGL1 and CGL2 can generate charges (e.g., electrons and holes) by forming complexes by redox reactions in a case where a voltage is applied to the light-emitting element ED. The charge generation layers CGL1 and CGL2 can supply the generated charges to each of the adjacent light-emitting structures EU-1, EU-2, and EU-3. The charge generation layers CGL1 and CGL2 can improve the efficiency of the current generated in each of the adjacent light-emitting structures EU-1, EU-2, and EU-3, and serve to adjust the charge balance between the adjacent light-emitting structures EU-1, EU-2, and EU-3.

[0143] Each of the charge generation layers CGL1 and CGL2 can have a laminate structure in which an n-type charge generation layer n-CGL and a p-type charge generation layer p-CGL are joined to each other.

[0144] The n-type charge generation layer n-CGL can be a charge generation layer that supplies electrons to the adjacent light-emitting structures EU-1, EU-2, and EU-3. The n-type charge generation layer n-CGL can be a layer in which a base substrate is doped with an n-type dopant. The p-type charge generation layer p-CGL can be a charge generation layer that supplies holes to the adjacent light-emitting structures EU-1, EU-2, and EU-3. The p-type charge generation layer p-CGL can be a layer in which a base substrate is doped with a p-type dopant.

[0145] FIG. 7 is a schematic cross-sectional view illustrating a portion of a display panel according to an embodiment. FIG. 7 is FIG. 5 is an enlarged schematic cross-sectional view of the region WW' of FIG. 7 is a schematic cross-sectional view illustrating the first retarder RT and the inorganic cover layer CP according to an embodiment in more detail. The content overlapping with the content described in FIG. 5

[0146] The first retarder RT can change a polarization state of light incident into the first retarder RT. The first retarder RT can include a λ / 4 phase difference retarder. The first retarder RT can be an optical layer that delays a phase of supplied light by λ / 4. The first retarder RT can have a value of a (in-plane) phase difference of about 100 nm or more and about 500 nm or less for light having a wavelength of about 550 nm. A Young's modulus of the first retarder RT can be about 0.1 GPa or more and about 3 GPa or less. A first thickness d1 of the first retarder RT can be about 0.5 μm or more and about 2.5 μm or less. For example, the first thickness d1 of the first retarder RT can be about 0.7 μm or more and about 1.5 μm or less. ​

[0147] The first retarder RT can be a liquid crystal coating type. The first retarder RT can include a base layer and a liquid crystal layer oriented on a surface of the base layer. However, embodiments are not limited thereto, and the first retarder RT can be provided only as the liquid crystal layer without the base layer as a support body. The liquid crystal layer can include a reactive liquid crystal monomer (e.g., a rod-like liquid crystal origin exhibiting a nematic liquid crystal phase). The liquid crystal layer can be manufactured by a process of applying and orienting the reactive liquid crystal monomer and then polymerizing and curing the reactive liquid crystal monomer. The degree of curing of the liquid crystal layer can be about 70% or more and about 90% or less. In embodiments, the liquid crystal layer can include a photoreactive polymer having a refractive index anisotropy.

[0148] The inorganic cover layer CP can cover the first retarder RT. The inorganic cover layer CP can include a first inorganic layer CP1 disposed on the first retarder RT and a second inorganic layer CP2 disposed on the first inorganic layer CP1. The first inorganic layer CP1 can be disposed (e.g., directly disposed) on the first retarder RT, and the second inorganic layer CP2 can be disposed (e.g., directly disposed) on the first inorganic layer CP1.

[0149] The second thickness d2 of the first inorganic layer CP1 can be substantially the same as the third thickness d3 of the second inorganic layer CP2, or the second thickness d2 of the first inorganic layer CP1 can be greater than the third thickness d3 of the second inorganic layer CP2. In the description, the term "substantially the same" can include not only a case in which the thicknesses of components are physically exactly the same, but also a case in which there is a difference although the design is the same due to an error range occurring during a process. The second thickness d2 of the first inorganic layer CP1 can be about 0.1 µm or more and about 0.8 µm or less. For example, the second thickness d2 of the first inorganic layer CP1 can be about 0.2 µm or more and about 0.4 µm or less. The third thickness d3 of the second inorganic layer CP2 can be about 0.1 µm or more and about 0.5 µm or less. For example, the third thickness d3 of the second inorganic layer CP2 can be about 0.1 µm or more and about 0.4 µm or less. The sum of the second thickness d2 of the first inorganic layer CP1 and the third thickness d3 of the second inorganic layer CP2 can be less than the first thickness d1 of the first retarder RT described above.

[0150] The first inorganic layer CP1 can include silicon nitride, and the second inorganic layer CP2 can include silicon oxynitride. A first ratio of oxygen atoms included in the first inorganic layer CP1 can be less than a second ratio of oxygen atoms included in the second inorganic layer CP2. For example, the first inorganic layer CP1 can not include oxygen atoms, and thus, the first ratio can be substantially 0.

[0151] The refractive index of the first inorganic layer CP1 can be greater than the refractive index of the second inorganic layer CP2. The refractive index of the first inorganic layer CP1 can be greater than about 1.7 and less than or equal to about 2.0 with respect to light having a wavelength of about 550 nm. For example, the refractive index of the first inorganic layer CP1 can be about 1.80 or greater and about 1.90 or less with respect to light having a wavelength of about 550 nm, although embodiments are not limited thereto. The refractive index of the second inorganic layer CP2 can be about 1.5 or greater and about 1.7 or less with respect to light having a wavelength of about 550 nm. For example, the refractive index of the second inorganic layer CP2 can be about 1.55 or greater and about 1.65 or less with respect to light having a wavelength of about 550 nm.

[0152] The residual stress of the first inorganic layer CP1 can be greater than the residual stress of the second inorganic layer CP2. The liquid crystal layer of the first retarder RT can be formed by a curing process, and the residual stress of the first inorganic layer CP1 applied according to the curing process can be greater than the residual stress of the second inorganic layer CP2. For example, the compressive stress of the first inorganic layer CP1 can be greater than the compressive stress of the second inorganic layer CP2. In another example, the tensile stress of the first inorganic layer CP1 can be greater than the tensile stress of the second inorganic layer CP2.

[0153] FIG. 8 is a schematic cross-sectional view of a display device according to another embodiment. FIG. 8 is a display device corresponding to the display device of FIG. 5 is a schematic cross-sectional view of a display device corresponding to the display device of FIG. 5 in the description of components of the display device DD-a according to an embodiment, the contents duplicated with those described in

[0154] Referring to FIG. 8 , the display device DD-a can include a display panel DP-a and a light control panel OP-a disposed on the display panel DP-a.

[0155] The light control panel OP-a can include a second retarder QW and a polarization layer PZ. The light control panel OP-a can not include a color filter layer CFL (see FIG. 5 ).

[0156] The display panel DP-a can include a display element layer D-OLa, and the display element layer D-OLa can include a first light emitting element ED1-a, a second light emitting element ED2-a, and a third light emitting element ED3-a. The first light emitting element ED1-a can emit blue light, the second light emitting element ED2-a can emit green light, and the third light emitting element ED3-a can emit red light.

[0157] The first light emitting element ED1-a can include a first pixel electrode AE1, a hole transport region HTR, an emission layer EML-B, an electron transport region ETR, and a second electrode CE, the second light emitting element ED2-a can include a second pixel electrode AE2, a hole transport region HTR, an emission layer EML-G, an electron transport region ETR, and a second electrode CE, and the third light emitting element ED3-a can include a third pixel electrode AE3, a hole transport region HTR, an emission layer EML-R, an electron transport region ETR, and a second electrode CE.

[0158] In FIG. 8 , the emission layers EML-R, EML-G, and EML-B of the light emitting elements ED1-a, ED2-a, and ED3-a can be disposed within a light emitting opening (or opening) OH defined in the pixel defining layer PDL, and an embodiment in which the hole transport region HTR, the electron transport region ETR, and the second electrode CE are disposed as a common layer throughout the light emitting elements ED1-a, ED2-a, and ED3-a is shown. However, embodiments are not limited thereto, and in an embodiment, the hole transport region HTR and the electron transport region ETR can be disposed to be patterned inside the light emitting opening OH defined in the pixel defining layer PDL, differently from what is shown in FIG. 8 , for example, in an embodiment, the hole transport region HTR, the emission layers EML-R, EML-G, and EML-B, and the electron transport region ETR of the light emitting elements ED1-a, ED2-a, and ED3-a can be patterned using an inkjet printing method to be provided.

[0159] Hereinafter, a characteristic evaluation result of a display panel and a display device according to embodiments will be described with reference to embodiments, comparative examples, and the above FIG. 7 For example, the embodiments shown below can be examples to help understanding of the invention, and the scope of the invention is not limited thereto.

[0160] (MANUFACTURE OF DISPLAY DEVICE) The display devices according to embodiments and comparative examples were manufactured by forming a first retarder having a thickness of about 1.2 μm on a glass substrate and forming an inorganic cover layer on the first retarder.

[0161] In Embodiment 1 and Embodiment 2, the inorganic cover layer was manufactured to include the first inorganic layer and the second inorganic layer disposed on the first inorganic layer, and in Comparative Example 1, the inorganic cover layer was manufactured to include only the first inorganic layer. The thickness of the first inorganic layer and the second inorganic layer according to Embodiment 1 and Embodiment 2, the material contained in the first inorganic layer and the second inorganic layer, and the refractive index of the first inorganic layer and the second inorganic layer are shown in Table 1 below. For example, the thickness of the first inorganic layer according to Comparative Example 1, the material contained in the first inorganic layer, and the refractive index of the first inorganic layer are shown in Table 1 below. In Embodiment 1 and Embodiment 2 and Comparative Example 1, the first inorganic layer and the second inorganic layer were manufactured to have the same structure as the display device shown in FIG. 1, except for the difference in the layer structure within the inorganic cover layer. FIG. 5 a display device having the same structure as shown in FIG. 1.

[0162] In the manufacturing according to the embodiments and the comparative example, the first material is silicon nitride, the second material is silicon oxynitride, and the refractive index of each layer is measured with respect to light having a wavelength of about 550 nm.

[0163] [Table 1]

[0164] (Evaluation of the display device) The residual stress σ 0h and σ 168h of each of the first inorganic layer and the second inorganic layer according to Embodiment 1 and Embodiment 2 described above were measured. 0h and σ 168h of the first inorganic layer according to Comparative Example 1 were measured. The first retarder can be manufactured by a curing process, and the residual stress σ 0h may refer to a compressive stress or a tensile stress applied to each of the first inorganic layer and the second inorganic layer due to the curing process. The residual stress σ 168h may refer to a compressive stress or a tensile stress of each of the first inorganic layer and the second inorganic layer according to the embodiments and the comparative example after being exposed to a temperature of about 85℃ and an absolute humidity of about 85% for about 168 hours. The total residual stress σ total,168h of the inorganic cover layer was calculated by adding the measured residual stress σ 168h of each of the first inorganic layer and the second inorganic layer. The results of the above measurement and calculation are shown in Table 2 below.

[0165] [Table 2]

[0166] The optical properties of the first retarder RT included in each of the above-described Example 1 and Example 2 and Comparative Example 1 were evaluated. For example, the laminate structure of the first retarder RT and the inorganic cover layer CP according to the examples and comparative examples was randomly arranged between crossed polarizing plates to obtain the secondary efficiency T 0h and T 500h , and the tertiary efficiency D 0h and D 500h were measured. The secondary efficiency T 0h was measured using the following Equation 1, and the tertiary efficiency D 0h was measured using the following Equation 2. The secondary efficiency T 500h and the tertiary efficiency D 500h may correspond to values measured after exposure to a temperature of about 85°C and an absolute humidity of about 85% for about 500 hours according to the examples and comparative examples. The secondary efficiency T 0h is measured under the condition that Φ is 45° in the following Equation 1.

[0167] [Equation 1]

[0168] In Equation 1, Φ is an angle at which an optical axis of the first retarder is angled with respect to an optical axis of the polarizing plate, n is a birefringence of the first retarder, and d is a thickness of the first retarder.

[0169] [Equation 2]

[0170] In Equation 2, T max refers to a maximum value of T 0h according to Φ in Equation 1, and T min refers to a minimum value of T 0h according to Φ in Equation 1.

[0171] The transmittance and reflectance R SCI and R SCE of each of the above-described Example 1, Example 2, and Comparative Example 1 were measured. The transmittance of visible light having a wavelength range of about 380 nm to about 780 nm was measured using a CA-310 of Konica Minolta, and the reflectance R SCI and R SCE was measured using a CM-3700A of Konica Minolta. The reflectance R SCI indicates a reflectance including a specular component (SCI), and the reflectance R SCE indicates a reflectance excluding a specular component (SCE). The results of the above-described measurement and calculation are shown in Table 3 below.

[0172] [Table 3]

[0173] Referring to Tables 1 to 3, in the display device according to the embodiment, since the inorganic cover layer covering the first retarder includes not only the first inorganic layer but also the second inorganic layer, it is seen that the reliability is improved due to the relatively high transmittance and low reflectance. For example, the display device according to the embodiment can include the second inorganic layer, the ratio of oxygen atoms of which is relatively high compared to the ratio of oxygen atoms of the first inorganic layer, to improve the device reliability.

[0174] Referring to Table 2, it is seen that the total residual stress σ total,168h of the inorganic cover layer in Comparative Example 1 is relatively large compared to that of the embodiment. total,168h Since Comparative Example 1 does not provide the second inorganic layer of the second material including silicon oxynitride compared to the embodiment, it is understood that the total residual stress σ total,168h in the inorganic cover layer is relatively large. On the other hand, in the case of the embodiment, since the second inorganic layer of the second material including silicon oxynitride is provided, even if the first retarder is manufactured through a curing process, since the residual stress of the compressive stress and the tensile stress is low under a high temperature and high humidity environment, the reliability of the display panel can be improved.

[0175] Referring to Table 3, in Comparative Example 1, it is seen that the secondary efficiency T 500h is significantly reduced compared to the secondary efficiency T 0h , and the tertiary efficiency D 500h is significantly reduced compared to the tertiary efficiency D 0h . In Comparative Example 1, since the second inorganic layer is not provided compared to the embodiment, since the phase retardation function performance of the first retarder is reduced under a high temperature and high humidity environment, or the thickness of the first retarder is reduced, it is considered that the secondary efficiency T 500h is deteriorated. In Comparative Example 1, since the second inorganic layer is not provided compared to the embodiment, it is considered that the orientation of the first retarder is twisted under a high temperature and high humidity environment, and it is considered that the tertiary efficiency D 500h is deteriorated. In Comparative Example 1, it is seen that the transmittance of the visible light within the device is reduced, and the reflectance is increased compared to the embodiment. In Comparative Example 1, since the second inorganic layer is not provided compared to the embodiment, the reliability of the inorganic cover layer covering the first retarder is deteriorated, and the above-mentioned secondary efficiency and tertiary efficiency are deteriorated, and thus it is considered that the luminous efficiency according to Comparative Example 1 is significantly deteriorated.

[0176] Whether or not a wrinkle occurs on the first retarder according to the above-described Example 1, Example 2, and Comparative Example 1 was evaluated. For example, whether or not a wrinkle occurs on the first retarder according to Comparative Example 2 was evaluated. Comparative Example 2 is identical to Example 2 except that the first inorganic layer includes the second material and the second inorganic layer includes the first material, compared to Example 2. The evaluation of whether or not a wrinkle occurs was evaluated in the following manner, and the case where a wrinkle occurs is marked as O, and the case where no wrinkle occurs is marked as X, after exposure at a temperature of about 85°C and an absolute humidity of about 85% for about 500 hours.

[0177] [Table 4]

[0178] Referring to Table 4, in the display device according to the embodiment, compared to the display device according to the comparative example, since the inorganic cover layer covering the first retarder includes the second inorganic layer, and the ratio of oxygen atoms included in the second inorganic layer is relatively high compared to the ratio of oxygen atoms included in the first inorganic layer, it is confirmed that the surface flatness and reliability are improved.

[0179] In Comparative Example 1, compared to the embodiment, since the second inorganic layer is not provided, a wrinkle occurs on the surface of the first retarder, and thus it is considered that the surface flatness and reliability are deteriorated. In Comparative Example 2, since the second inorganic layer is provided, but the second material is not provided, but the first material having a relatively low ratio of oxygen atoms is provided, since a wrinkle occurs on the surface of the first retarder, it is considered that the surface flatness and reliability are deteriorated.

[0180] The display panel according to the embodiment can include the first inorganic layer and the second inorganic layer to improve the quality of the first retarder, thereby achieving excellent emission characteristics. For example, the display device according to the embodiment can include the display panel according to the embodiment to improve the reliability.

[0181] It will be apparent to those skilled in the art that various modifications and variations can be made in the present inventive concept. Thus, it is intended that the disclosure cover the modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0182] In summarizing the detailed description, those skilled in the art will understand that many changes and modifications can be made to the embodiments without substantially departing from the principles and spirit and scope of the disclosure. Therefore, the disclosed embodiments are used only in a general and descriptive sense and are not for the purpose of limitation.

Claims

1. A display device, comprising: a display panel; and a window provided on the display panel, wherein the display panel includes: a circuit element layer; a display element layer provided on the circuit element layer and including a light emitting element; an encapsulation layer provided on the display element layer; a first retarder provided on the encapsulation layer; a first inorganic layer provided on the first retarder; and a second inorganic layer provided on the first inorganic layer, and a ratio of oxygen atoms included in the first inorganic layer is less than a ratio of oxygen atoms included in the second inorganic layer.

2. The display device of claim 1, wherein, a refractive index of the first inorganic layer is greater than a refractive index of the second inorganic layer. 3.The display device of claim 1, wherein the first inorganic layer includes silicon nitride, and the second inorganic layer includes silicon oxynitride.

4. The display device of claim 1, wherein, a residual stress of the first inorganic layer is greater than a residual stress of the second inorganic layer.

5. The display device of claim 1, wherein, a first thickness of the first retarder is greater than a sum of a second thickness of the first inorganic layer and a third thickness of the second inorganic layer.

6. The display device of claim 5, wherein, the first thickness is in a range of 0.5 µm to 2.5 µm, the second thickness is in a range of 0.1 µm to 0.8 µm, and the third thickness is in a range of 0.1 µm to 0.5 µm.

7. The display device of claim 1, wherein, the first retarder includes a liquid crystal layer, and the liquid crystal layer has a curing degree of 70% or more and 90% or less.

8. The display device of claim 1, wherein, the first retarder has a phase difference of 100 nm or more and 500 nm or less at a wavelength of 550 nm. 9.The display device of claim 1, further comprising: an optical layer provided between the display panel and the window, wherein the optical layer includes: a second retarder provided on the second inorganic layer; and a polarizing layer provided on the second retarder, the polarizing layer includes a wire grid polarizing plate, and the second retarder includes a λ / 4 phase difference retarder. 10.An electronic device, comprising: a display device including a display panel and a window provided on the display panel, wherein the display panel includes: a circuit element layer; a display element layer provided on the circuit element layer and including a light emitting element; an encapsulation layer provided on the display element layer; a first retarder provided on the encapsulation layer; a first inorganic layer provided on the first retarder; and a second inorganic layer provided on the first inorganic layer, and a ratio of oxygen atoms included in the first inorganic layer is less than a ratio of oxygen atoms included in the second inorganic layer.

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