KR20230048999A - Electronic device including flexible display - Google Patents

Abstract

According to an embodiment of this document, an electronic device comprises: a foldable housing forming a front side of the electronic device and a rear side of the electronic device; and a flexible display located in an inner space of the foldable housing, coupled with a front cover forming the front of the foldable housing, and visible through the front cover. The front cover includes a periodically formed pattern of a plurality of openings corresponding to a folding portion of the foldable housing or a plurality of recesses formed on a surface facing the flexible display. In the flexible display, a plurality of subpixels outputting light of the same wavelength are arranged in the same direction as a direction in which the plurality of openings or the plurality of recesses are periodically arranged. A first interval may be larger than a second interval at which the plurality of subpixels are periodically arranged. Various other embodiments may be possible. Deterioration in visual quality (e.g. moire visibility) can be reduced.

Description

Electronic device including a flexible display {ELECTRONIC DEVICE INCLUDING FLEXIBLE DISPLAY}

Various embodiments of this document relate to an electronic device including a flexible display.

Electronic devices tend to be designed to provide a larger screen while having a portable size that does not cause inconvenience to a user's hand. The electronic device may be implemented as a foldable type capable of folding or unfolding a screen, for example.

[Document 1] Patent Publication (A) 10-2019-0032056 2019.03.27, paragraphs 0051 to 0059, Figures 6a to 7c

The foldable electronic device may include, for example, a lattice structure for contributing to flexibility in correspondence to the folding area of the screen. This lattice structure can affect the visual quality of the screen.

Various embodiments of the present document may provide an electronic device including a flexible display for reducing visual quality deterioration due to a lattice structure located in a folding area of a screen.

According to one embodiment of the present document, an electronic device is located in a foldable housing forming a front surface and a rear surface of the electronic device and an internal space of the foldable housing, and the front surface of the foldable housing It is combined with a front cover forming a and includes a flexible display visible through the front cover, wherein the front cover has a plurality of openings corresponding to the folding portion of the foldable housing or a surface facing the flexible display A plurality of recesses are formed in a pattern formed periodically, and a plurality of subpixels outputting light of the same wavelength among the flexible display are the plurality of openings or the plurality of recesses. may be arranged in the same direction as the direction in which the plurality of subpixels are periodically arranged, and the first interval may be greater than a second interval in which the plurality of subpixels are periodically arranged.

An electronic device including a flexible display according to various embodiments of the present disclosure can reduce visual quality deterioration (eg, a moire viewing phenomenon) due to a grid structure located in a folding area of a screen.

In addition, effects that can be obtained or predicted due to various embodiments of this document will be directly or implicitly disclosed in the detailed description of the embodiments of this document. For example, various effects predicted according to various embodiments of the present document will be disclosed within the detailed description to be described later.

1 is a view from various directions of an electronic device in an unfolded state, in one embodiment.
2 is views of an electronic device in a folded state viewed from various directions, in one embodiment.
FIG. 3 illustrates a cross-sectional structure in the xz plane of a display assembly included in an electronic device with respect to line CC' in FIG. 1, in one embodiment.
4 is an xy plan view of the first layer included in the front cover in an unfolded state of the electronic device, in one embodiment.
5 illustrates a cross-sectional structure of a flexible display included in the display assembly of FIG. 4, in one embodiment.
FIG. 6 shows a cross-sectional structure in the xz plane of a display assembly included in an electronic device with respect to line CC′ in FIG. 1 in another embodiment.
FIG. 7 shows a cross-sectional structure in the xz plane of a display assembly included in an electronic device with respect to line CC′ in FIG. 1 in another embodiment.
FIG. 8 shows a cross-sectional structure of an xz plane according to another embodiment in which the second layer is modified in the embodiment of FIG. 7, for example.
9 is an xy plan view illustrating a positional relationship between a lattice structure included in a front cover and a plurality of sub-pixels included in a flexible display in an unfolded state of an electronic device, in an embodiment.
FIG. 10 is an enlarged view of a portion indicated by reference numeral 901 in FIG. 9 .
11 is an xy plan view of a first layer including a fourth pattern according to another embodiment.
12 is an xy plan view of a first layer including a fourth pattern according to another embodiment.

Hereinafter, various embodiments of this document will be described with reference to the accompanying drawings.

Various embodiments of this document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, like reference numerals may be used for like or related elements. The singular form of a noun corresponding to an item may include one item or a plurality of items, unless the relevant context clearly dictates otherwise. In this document, "A or B", "at least one of A and B", "at least one of A or B," "A, B or C," "at least one of A, B and C," and "A Each of the phrases such as "at least one of , B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof. Terms such as "first", "second", or "first" or "secondary" may simply be used to distinguish that component from other corresponding components, and may refer to that component in other respects (eg, importance or order) is not limited.

Electronic devices according to various embodiments disclosed in this document may be devices of various types. The electronic device may include, for example, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. An electronic device according to an embodiment of the present document is not limited to the aforementioned devices.

1 is, in one embodiment, views of the electronic device 1 in a flat or unfolded state (or unfolding state) viewed from various directions. FIG. 2 is views of the electronic device 1 in a folded state (or folding state) viewed from various directions, according to an exemplary embodiment.

Referring to FIGS. 1 and 2 , in one embodiment, an electronic device 1 may include a foldable housing 10 and a flexible display 20 . The foldable housing 10 may include a front surface 10A of the electronic device 1 and a rear surface 10B of the electronic device 1 positioned opposite to the front surface 10A. For ease of understanding, the front surface 10A of the electronic device 1 is a surface on which the flexible display 20 is exposed to the outside, and the rear surface 10B of the electronic device 1 is located on the opposite side of the front surface 10A. interpreted side by side. The foldable housing 10 may include a first side surface 10C and a second side surface 10D of the electronic device 1 that at least partially surround a space between the front surface 10A and the rear surface 10B. The front surface 10A may include a first cover area ⓐ, a second cover area ⓑ, and a folding cover area F between the first cover area ⓐ and the second cover area ⓑ. . In the unfolded state of the foldable housing 10, the front surface 10A may be substantially flat, and the first cover area ⓐ, the second cover area ⓑ, and the folding cover area F are substantially the same. direction can be directed. The rear surface 10B may include a third cover area ⓒ and a fourth cover area ⓓ. The third cover area ⓒ is located on the opposite side of the front surface 10A to the first cover area ⓐ and may face in the opposite direction to the first cover area ⓐ. The fourth cover area ⓓ is located on the opposite side of the front surface 10A to the second cover area ⓑ and may face in the opposite direction to the second cover area ⓑ. In one embodiment, the foldable housing 10 may be implemented in an in-folding structure in which the front surface 10A is folded inward. For example, in the unfolded state of the foldable housing 10 (see FIG. 1 ), the folding cover area F is disposed in a flat shape, and the first cover area ⓐ and the second cover area ⓑ are about It can form an angle of 180 degrees. In the folded state of the foldable housing 10 (see FIG. 2), the folding cover area F is disposed in a curved shape, and the first cover area ⓐ and the second cover area ⓑ are at an angle of about 180 degrees and can form different angles. The folded state may include a fully folded state or an intermediate state. The completely folded state (see FIG. 2 ) is a maximally folded state in which the first cover area ⓐ and the second cover area ⓑ of the front surface 10A are no longer close to each other. For example, the first cover area ( ⓐ) and the second cover area ⓑ may form an angle of about 0 degrees to about 10 degrees. In a fully folded state, the front surface 10A may not be substantially exposed to the outside. An intermediate state may refer to a state between an unfolded state and a fully collapsed state. The folding cover area F of the front surface 10A may be more bent in a completely folded state than in an intermediate state. In some embodiments, the electronic device 1 may be implemented in an out-folding structure in which the front surface 10A (or screen) is folded outward.

According to an embodiment, the foldable housing 10 may include a front cover (eg, a window) 101 forming at least a portion of the front surface 10A. The flexible display 20 may overlap at least a portion of the front cover 101 and be positioned in the internal space of the electronic device 1 . The front cover 101 may protect the flexible display 20 from the outside and may be substantially transparent. Light output from the flexible display 20 may pass through the front cover 101 and proceed to the outside. The flexible display 20 includes, for example, a first display area (or first active area) overlapping the first cover area ⓐ of the front surface 10A, and a second cover area ⓑ of the front surface 10A. ) and a second display area (or a second active area) overlapping with, and a third display area (or third active area) overlapping with the folding cover area (F). In some embodiments, the third display area may be referred to by various other terms such as 'folding display area' or 'bendable display area'. The screen may refer to an area capable of expressing an image in a device including the flexible display 20 and the front cover 101, and for example, the display area of the flexible display 20 and the front cover 101 overlapping the display area may include an area of In some embodiments, the front cover 101 may be integrally formed with the flexible display 20 as a component included in the flexible display 20 . The front cover 101 may be implemented in a thin film form to have flexibility. The front cover 101 may include, for example, a plastic film (eg, a polyimide film) or a thin glass (eg, ultra-thin glass (UTG)). In some embodiments, the front cover 101 may include: Cover 101 may include a plurality of layers. It may be a form in which a coating layer or a protective layer of polyurethane)) is disposed.

According to one embodiment, the foldable housing 10 includes a first housing (or first housing part or first housing structure) 11, a second housing (or second housing part or second housing structure) ( 12), and a folding portion between the first housing 11 and the second housing 12. Coordinate axes shown for ease of understanding are based on the first housing 11, and for example, the first cover area (ⓐ) is substantially directed in the +z-axis direction, and the third cover area (ⓒ) is substantially can be directed in the -z axis direction. The first housing 11 and the second housing 12 are connected by a folding unit and may be mutually rotatable based on the folding axis A of the foldable housing 10 . The folding unit may include, for example, a hinge assembly (or hinge structure) (not shown). The folding axis A may be a rotational axis of the hinge assembly. In the illustrated example, the folding axis A may be parallel to the y-axis direction. The first housing 11 has a first rear surface that forms at least a portion of the first cover portion of the front cover 101 and the third cover area ⓒ of the rear surface 10B located on one side with respect to the folding axis A. A first side member (or first side bezel structure) 112 forming the first side surface 10C by at least partially enclosing the cover 111 and the space between the first cover part and the first rear cover 111. can include The first cover portion of the front cover 101 may include, for example, a first folding cover area F1 located on one side of the first cover area ⓐ and the folding cover area F with respect to the folding axis A. ) can be formed. The second housing 12 has a second rear surface that forms at least a portion of the second cover portion of the front cover 101 located on one side with respect to the folding axis A and the fourth cover area ⓓ of the rear surface 10B. Cover 121, and a second side member (or side bezel structure) 122 forming a second side surface 10D by at least partially enclosing a space between the second cover part and the second rear cover 121. can do. The second cover portion of the front cover 101 may include, for example, a second folding cover area F2 located on the other side with respect to the folding axis A of the second cover area ⓑ and the folding cover area F. ) can be formed. In a completely folded state of the foldable housing 10, the first side member 112 and the second side member 122 may overlap and align at least partially. The first side member 112 and/or the second side member 122 may be, for example, ceramic, polymer, metal (eg, aluminum, stainless steel, or magnesium), or a combination of at least two of the foregoing. can be formed by The first side member 112 and/or the second side member 122 may be, for example, titanium, an amorphous alloy, a metal-ceramic composite material (eg, cermet), stainless steel, magnesium, a magnesium alloy, It may include various metal materials such as aluminum, aluminum alloy, zinc alloy, or copper alloy. The first rear cover 111 and/or the second rear cover 121 may be substantially opaque. The first rear cover 111 and/or the second rear cover 121 may be, for example, coated or tinted glass, ceramic, polymer, metal (eg aluminum, stainless steel, or magnesium), or the above materials. It may be formed by a combination of at least two of them. The first rear cover 111 or the second rear cover 121 includes, for example, at least one coating layer disposed on the plate using a plate and a coating made of various materials such as transparent glass, ceramic, or polymer. can include For another example, the first rear cover 111 or the second rear cover 121 may include a plate made of various materials such as transparent glass, ceramic, or polymer, and a film having various visual effects attached to the plate (eg, decorations). A film (decoration film) may be included. In some embodiments, the first rear cover 111 and the first side member 112 may be integrally formed and may include the same material. In some embodiments, the second rear cover 121 and the second side member 122 may be integrally formed and may include the same material.

According to one embodiment, the folding unit may include the hinge housing 30 . The hinge housing 30 may cover at least one hinge connecting the first housing 11 and the second housing 12 . In some embodiments, the hinge housing 30 may be referred to as a 'hinge cover'. When the electronic device 1 is converted from the unfolded state of FIG. 1 to the folded state of FIG. 2 , the hinge housing 30 opens the gap B between the first housing 11 and the second housing 12, The inside of the electronic device 1 may be covered so as not to be exposed. As shown in FIG. 1 , in the unfolded state of the electronic device 1, the gap B may be substantially absent, and the hinge housing 30 is attached to the first housing 11 and the second housing 12. may be covered and not exposed to the outside. Although not shown, in the intermediate state of the electronic device 1, the hinge housing 30 may be partially exposed between the first housing 11 and the second housing 12. The hinge housing 30 may be more exposed in the folded state of FIG. 2 than in the intermediate state.

According to some embodiments, the foldable housing 10 has a structure (eg, a foldable housing) forming at least a portion of a front surface 10A, a rear surface 10B, a first side surface 10C, and a second side surface 10D. structure, or foldable housing assembly). For example, the foldable housing 10 may include a first housing part, a second housing part, and a folding part connected to the first housing part and the second housing part. The folding portion may refer to a more flexible portion than the first housing portion and the second housing portion, and may be bent in a folded state of the electronic device 1 . The folding portion may include, for example, a hinge assembly. For another example, the folding part may include a structure in which a plurality of bars are arranged (eg, a multi-bar structure), but is not limited thereto, and may have bending characteristics while connecting the first housing part and the second housing part. It can be implemented in various other structures.

According to an embodiment, the electronic device 1 may include a display (hereinafter referred to as a sub-display) 210 positioned inside the first housing 11 adjacent to the first rear cover 111 . A partial area of the first rear cover 111 may overlap the sub display 210 and may be substantially transparent. The electronic device 1 may output an image using the sub display 210 instead of the flexible display 20 in the folded state of FIG. 2 .

According to one embodiment, the second rear cover 121 may include a second curved area 121a that is curved from the fourth cover area ⓓ toward the second cover area ⓑ and extends seamlessly. . The second curved area 121a may be formed adjacent to a long edge of the second rear cover 121 that is substantially parallel to the folding axis A. The sub display 210 may include a flexible display that may be disposed in a corresponding form.

According to one embodiment, the first rear cover 111 may include a first curved area 111a that is curved and seamlessly extended from the third cover area ⓒ to the first cover area ⓐ. The first curved area 111a may be formed adjacent to a long edge of the first rear cover 111 substantially parallel to the folding axis A. For example, in an unfolded state (see FIG. 1 ) or a folded state (see FIG. 2 ) of the electronic device 1, for aesthetics, the first curved region 111a and the second curved region 121a are opposite to each other. It can be positioned substantially symmetrically on the side. In some embodiments, the first curved area 111a or the second curved area 121a may be omitted.

According to an embodiment, the electronic device 1 may include an input module, a sound output module, a camera module, a sensor module, or a connection terminal. In some embodiments, the electronic device 1 may omit at least one of the components or additionally include other components. The location or number of components included in the electronic device 1 is not limited to the illustrated example and may vary.

The input module may include, for example, a microphone located inside the electronic device 1 and a microphone hole 201 formed on the first side surface 10C to correspond to the microphone. The position or number of the input module including the microphone and the corresponding microphone hole 201 may vary without being limited to the illustrated example. In some embodiments, the electronic device 1 may include a plurality of microphones capable of detecting the direction of sound.

The input module may include, for example, key input devices 202 . The key input devices 202 may be located, for example, in openings (not shown) formed on the first side surface 10C. In some embodiments, the electronic device 1 may not include some or all of the key input devices 202, and the key input devices not included use the flexible display 20 or the sub display 210 to It can be implemented as a soft key. In some embodiments, the input module may include at least one sensor module.

The sound output module may include, for example, a speaker located inside the electronic device 1 and a speaker hole 203 formed on the second side surface 10D to correspond to the speaker. The position or number of the sound output module including the speaker and the corresponding speaker hole 203 may vary without being limited to the illustrated example. In some embodiments, the microphone hole 201 and the speaker hole 203 may be implemented as one hole. In some embodiments, a piezo speaker in which the speaker hole 203 is omitted may be implemented. The sound output module may include, for example, a receiver for communication located inside the electronic device 1 and a receiver hole (not shown) formed in the fourth cover area ⓓ to correspond to the receiver for communication. .

The camera module is, for example, a first camera module (or front camera module) 205 positioned corresponding to the fourth cover area (ⓓ), or a plurality of third camera modules positioned corresponding to the third cover area (ⓒ). 2 camera modules (or rear camera modules) 206 may be included. The first camera module 205 and/or the plurality of second camera modules 206 may include one or a plurality of lenses, an image sensor, and/or an image signal processor. The location or number of the first camera module 205 or the plurality of second camera modules 206 is not limited to the illustrated example and may vary.

According to an embodiment, the sub display 210 may include an opening aligned with the first camera module 205 . External light may pass through the second rear cover 121 and the opening of the sub display 210 to reach the first camera module 205 . In some embodiments, the opening of the sub display 210 may be formed in a notch shape according to the position of the first camera module 205 . In some embodiments, the first camera module 205 may be located on the rear surface of the sub display 210 or below or beneath the sub display 210, and the first camera module 205 It is possible to perform related functions (eg, image taking) without visually distinguishing (or exposing) the location. For example, the first camera module 205 may include a hidden display rear camera (eg, an under display camera (UDC)). In some embodiments, the first camera module 205 may be positioned aligned with a recess formed on the rear surface of the sub display 210 . The first camera module 205 may be disposed to overlap at least a portion of the screen and acquire an image of an external subject without being visually exposed to the outside. In this case, some areas of the sub-display 210 overlapping at least partially with the first camera module 205 may include a different pixel structure and/or wiring structure than other areas. For example, some areas of the sub-display 210 overlapping at least partially with the first camera module 205 may have different pixel densities than other areas. A pixel structure and/or a wiring structure formed in a portion of the sub-display 210 overlapping at least partially with the first camera module 205 may reduce loss of light between the outside and the first camera module 205 . In some embodiments, pixels may not be disposed in a partial area of the sub display 210 overlapping at least partially with the first camera module 205 .

According to an embodiment, the plurality of second camera modules 206 may have different properties (eg, angles of view) or functions, and may include, for example, dual cameras or triple cameras. The plurality of second camera modules 206 may include a plurality of camera modules including lenses having different angles of view, and based on the user's selection, the electronic device 1 It is possible to control to change the angle of view of the camera module being performed. The plurality of second camera modules 206 may include at least one of a wide-angle camera, a telephoto camera, a color camera, a monochrome camera, or an infrared (IR) camera (eg, a time of flight (TOF) camera or a structured light camera). can include In some embodiments, an IR camera may operate as at least part of a sensor module. The electronic device 1 may include a flash 207 as a light source for the plurality of second camera modules 206 . The flash 207 may include, for example, a light emitting diode or a xenon lamp.

The sensor module may generate an electrical signal or data value corresponding to an internal operating state of the electronic device 1 or an external environmental state. The sensor module may include, for example, a proximity sensor, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a color sensor, an IR (infrared) sensor, a biometric sensor (eg, a fingerprint sensor, an HRM sensor), It may include at least one of a temperature sensor, a humidity sensor, or an illuminance sensor.

According to an embodiment, the sensor module may include an optical sensor 208 located inside the electronic device 1 corresponding to the fourth cover area ⓓ. The optical sensor 208 may include, for example, a proximity sensor or an ambient light sensor. The optical sensor 208 may be aligned with an opening formed in the sub display 210 . External light may pass through the opening of the second rear cover 121 and the sub display 210 and reach the optical sensor 208 . In some embodiments, the optical sensor 208 may be located on the back of the sub-display 210 or below or beneath the sub-display 210, and the position of the optical sensor 208 may be visually distinguished (or exposure) and can perform related functions. In some embodiments, the optical sensor 208 may be positioned aligned with a recess formed in the rear surface of the sub-display 210 . The optical sensor 208 is arranged to overlap at least a portion of the screen, and can perform a sensing function without being exposed to the outside. In this case, some areas of the sub-display 210 overlapping at least partially with the optical sensor 208 may include a different pixel structure and/or wiring structure than other areas. For example, some areas of the sub-display 210 overlapping at least partially with the optical sensor 208 may have different pixel densities than other areas. In some embodiments, the sensor module may include a fingerprint sensor (not shown) located below the sub display 210 . The fingerprint sensor may be implemented in a capacitive method, an optical method, or an ultrasonic method. A pixel structure and/or a wiring structure formed in a portion of the sub-display 210 overlapping at least partially with the sensor module allows various types of signals (eg, light or ultrasonic waves) related to the sensor module to pass between the outside and the sensor module. when the loss can be reduced. In some embodiments, a plurality of pixels may not be disposed in a partial area of the sub display 210 that at least partially overlaps the sensor module.

The connection terminal may include, for example, a connector (eg, a USB connector) located inside the electronic device 1 . The electronic device 1 may include a connector hole 209 formed on the first side surface 10C to correspond to the connector. The electronic device 1 may transmit and/or receive power and/or data with an external electronic device electrically connected to the connector through the connector hole 209 . The position or number of the connector and the corresponding connector hole 209 may vary without being limited to the illustrated example.

According to an embodiment, the electronic device 1 may include a detachable pen input device (eg, an electronic pen, a digital pen, or a stylus pen) (not shown). For example, the pen input device may be attached to or detached from the hinge housing 30 . The hinge housing 40 may include a recess, and the pen input device may fit into the recess. The pen input device may be attached to or detached from a recess of the hinge housing 30 exposed to the outside in a folded state (see FIG. 2 ) or an intermediate state of the electronic device 1 . In some embodiments, the electronic device 1 may be implemented such that a pen input device may be inserted into an inner space of the first housing 11 or the second housing 12 .

FIG. 3 shows, in one embodiment, a cross-sectional structure 300 in the x-z plane of the display assembly 30 included in the electronic device 1 with respect to line C-C′ in FIG. 1 . FIG. 4 is an x-y plan view of the first layer 310 included in the front cover 101 in an unfolded state of the electronic device 1 (see FIG. 1 ) in one embodiment. FIG. 5 shows a cross-sectional structure 500 of the flexible display 20 included in the display assembly 30 of FIG. 4, in one embodiment. FIG. 6 shows a cross-sectional structure 600 in the x-z plane of the display assembly 60 included in the electronic device 1 with respect to line C-C′ in FIG. 1 in another embodiment.

3 and 4 , in one embodiment, the display assembly 30 is a front cover 101, flexible display 20, and / or optically transparent between the front cover 101 and flexible display 20. An adhesive member 350 may be included. The front cover 101 and the flexible display 20 may be coupled using an optical transparent adhesive member 350 . The transparent adhesive member 350 for optical use may include, for example, optical clear adhesive (OCA), optical clear resin (OCR), or super view resin (SVR). The front cover 101 and the optical transparent adhesive member 350 may be substantially transparent, and the light output from the flexible display 20 passes through the optical transparent adhesive member 350 and the front cover 101 to reach the outside. can proceed with The flexible display 20 includes a first display area corresponding to the first cover area ⓐ of the front cover 101, a second display area corresponding to the second cover area ⓑ of the front cover 101, and a front A third display area (or folding display area) corresponding to the folding cover area F of the cover 101 may be included. The cross-sectional structure 300 shown in FIG. 3 may correspond to a part of the display assembly 30 corresponding to the folding cover area F of the front cover 101 .

According to one embodiment, the front cover 101 may include a first surface 301 and a second surface 302 located opposite to the first surface 301 . The first surface 301 may form the front surface 10A (see FIG. 1 ) of the electronic device 1 . The first face 301 and the second face 302 may be substantially parallel, and the thickness of the front cover 101 (eg, the distance between the first face 301 and the second face 302) may be The first cover area ⓐ, the second cover area ⓑ, and the folding cover area F may be substantially identically formed.

According to one embodiment, the front cover 101 may include a first layer 310 , a second layer 320 , a third layer 330 , and/or a fourth layer 340 . The first layer 310 and the second layer 320 may be positioned between the third layer 330 and the optical transparent adhesive member 350 . The third layer 330 may be positioned closer to the fourth layer 340 than the first layer 310 and between the fourth layer 340 and the optical transparent adhesive member 350 .

The first layer 310 may be, for example, a transparent plate made of glass or plastic (eg, polyimide). In one embodiment, the first layer 310 is a glass plate formed of an element such as selenium or sulfur, an oxide such as silicon, boron, or germanium, or an inorganic material such as an oxide salt, sulfide, selenium, or halide (e.g., thin glass or ultra thin glass). Glass, for example, may include a basic network form material or may further include an auxiliary material that is chemically bonded thereto to provide properties such as mechanical strength, chemical durability, transparency, or electrical insulation. . For example, the first layer 310 may be formed through an operation of forming thin glass and an operation of reinforcing the thin glass. The thin glass may have a thickness of, for example, about 30 μm (micrometer) to about 1000 μm, but is not limited thereto. In the operation of reinforcing the thin glass, for example, a special material may be injected into the thin glass at a predetermined depth or more. The first layer 310 may have a smooth touch or surface uniformity inherent in glass. The first layer 310 including glass may have higher hardness than a plastic film (eg, a polyimide film). When the first layer 310 including glass forms the front surface 10A (see FIG. 1) of the electronic device 1 (eg, when the third layer 330 and the fourth layer 340 are omitted) ), the first layer 310 may have excellent scratch resistance compared to plastic film (eg, polyimide film).

According to some embodiments, the first layer 310 may include glass having various optical properties. For example, the first layer 310 may be implemented to pass or not pass light of a specific wavelength band, such as ultraviolet light or infrared light.

According to some embodiments, the first layer 310 may include glass having a relatively low permittivity in order to prevent energy loss in the glass. For example, the first layer 310 may include glass having relatively low dielectric loss. Accordingly, performance degradation of at least one component (eg, an electromagnetic induction panel, a touch sensing circuit, or an antenna) that generates an electric or magnetic field toward the first surface 301 may be reduced. In some embodiments, the first layer 310 may include glass having a low alkali content, such as sodium, since charges may be transported (eg, ion conduction) under the action of an electric field when there are sodium ions in the glass.

The first layer 310 includes, for example, a third surface 303 facing the first surface 301 of the front cover 101 and a fourth surface facing the second surface 302 of the front cover 101. may include face 304 . The third side 303 and the fourth side 304 can be substantially parallel. The first layer 310 has a thickness (eg, the third surface 303 and the third surface 303) that contributes to preventing bending stress from substantially reaching the yield stress in the folded state of the electronic device 1 (see FIG. 2). The separation distance between the four sides 304) may be formed. In some embodiments, a portion of the first layer 310 corresponding to the folding cover area F of the front cover 101 is the first cover area ⓐ and/or the second cover area of the front cover 101 ( ⓑ) may be implemented to have a relatively thin thickness.

According to one embodiment, the first layer 310 may include a fourth pattern (or fourth pattern structure) 40 formed to correspond to the folding cover area F of the front cover 101 . The fourth pattern 40 of the first layer 310 includes, for example, a plurality of openings (or slits) penetrating between the third and fourth surfaces 303 and 304 . ) 401 may include a lattice structure. The plurality of openings 401 included in the lattice structure may be formed periodically, have substantially the same shape, and may be repeatedly arranged at regular intervals. In one embodiment, the plurality of openings 401 may be a series of corrugated shapes. In some embodiments, the plurality of openings 401 is a series of sinuous curves, bends, loops, turns, or windings. It can be formed in the form of including. The shape of the plurality of openings 401 included in the lattice structure may be various other than that. In some embodiments, a lattice structure including a plurality of openings 401 may be referred to by other terms such as an 'opening pattern', a 'hole pattern', or a 'lattice pattern'. The fourth pattern 40 of the first layer 310 may contribute to flexibility of the folding cover area F and a portion of the display assembly 30 corresponding thereto. In some embodiments, referring to the cross-sectional structure 600 of FIG. 6 , the fourth pattern 40 of the first layer 310 is a recess pattern including a plurality of recesses 601 (not shown). ) can be transformed into The plurality of recesses 601 may indicate, for example, a portion formed in a hollow in the fourth surface 304 . A first portion of the first layer 310 including the plurality of recesses 601 may have a first thickness based on the third surface 303 , and the plurality of recesses 601 of the first layer 310 may have a first thickness. The second part that does not include them may have a second thickness thicker than the first thickness based on the third surface 303 . In some embodiments, the fourth pattern 40 formed of a lattice structure including a plurality of openings 401 or a recess pattern including a plurality of recesses 601 is the first cover of the front cover 101. It may extend to the area ⓐ or the second cover area ⓑ. In one embodiment, the plurality of openings 401 or the plurality of recesses 601 included in the fourth pattern 40 of the first layer 310 are laser, CNC machining, or scratching. , blasting, polishing, or etching (eg, chemical etching).

According to one embodiment, the second layer 320 may be combined with the first layer 310 . The second layer 320 may include a substantially transparent polymer. Of the front cover 101, the smooth second surface 302 for bonding with the flexible display 20 may be formed by the second layer 320, and the second layer 320 is formed of the first layer 310. It may include a portion filled in the plurality of openings 401 (or the plurality of recesses 601 in the embodiment of FIG. 6 ). Compared to the structure in which the third layer 330 is disposed on the first layer 310 in the embodiment of FIG. 6 , the third layer 330 in the embodiment of FIG. 3 includes the first layer 310 and the second layer. Of the 320, it may be disposed on one surface formed by the portions located in the plurality of openings 401.

According to one embodiment, the second layer 320 may reinforce the first layer 310 . Impact resistance or durability of the first layer 310 may be reinforced by the second layer 320 . In the folded state of the electronic device 1 (see FIG. 2 ), the second layer 320 is bent in a bending area corresponding to the folding cover area F of the front cover 101 among the first layers 310. It can relieve stress. Since the bending stress generated in the first layer 310 due to repeated switching between the unfolded state and the folded state of the electronic device 1 may cause damage due to deterioration or loss of elasticity due to fatigue accumulation, the second layer ( 320 may relieve bending stress generated in the first layer 310 .

According to one embodiment, the second layer 320 has its shape and/or physical properties (eg, hardness or ductility) so that the flexibility of the folding cover area F of the front cover 101 does not decrease below a specified level. (ductility)). The specified level of flexibility allows the display assembly 30 or 60 to be smoothly deformed in a state transition of the electronic device 1 (eg, transition between an unfolded state and a folded state) while substantially not causing breakage or permanent deformation thereof. It can be a value that For example, when the electronic device 1 is converted from a folded state to an unfolded state, the second layer 320 has elasticity contributing to restore the front cover 101 without substantially plastic deformation. can The second layer 320 may have an elongation of about 4% to about 20%, for example.

According to one embodiment, the folding cover area F of the front cover 101 has a plurality of openings 401 (or in the embodiment of FIG. 6 ) compared to the first cover area ⓐ and the second cover area ⓑ. Since it includes a plurality of recesses 601 , it may be relatively vulnerable to external impact or external pressure. For example, when a user input is performed by contacting a pen tip of a pen input device to the first surface 101 of the front cover 101, the folding cover area F of the front cover 101 is Compared to the first cover area (ⓐ) and the second cover area (ⓑ), there is a risk of breakage due to an external impact or external pressure applied from the pen tip. The second layer 320 may reduce damage to the first layer 310 from an external shock or external pressure applied to the first layer 310 . The second layer 320 may relieve stress that may occur in the first layer 310 due to external impact or external pressure. The second layer 320 may have a hardness capable of reducing damage to the folding cover region F of the front cover 101 in response to external impact or external pressure. The hardness of the second layer 320 may reduce damage to the folding cover area F by providing resistance against local plastic deformation of the folding cover area F due to external impact or external pressure.

According to one embodiment, the second layer 320 may include an acryl-based, urethane-based, or silicon-based organic material.

According to an embodiment, the second layer 320 may be formed using an ultraviolet rays (UV) molding liquid (eg, a light curable material). The first layer 310 may be placed on a mold into which the UV molding liquid is injected (eg, a UV molding mold) and then pressed with a roller, so that the UV molding liquid may be applied between the first layer 310 and the mold. can be spread out evenly. In some embodiments, the first layer 310 may be coated with a primer using a method such as vacuum deposition or spattering, then placed on a mold into which a UV molding liquid is injected, and then compressed. In this case, although not shown, there may be a bonding layer including a primer between the first layer 310 and the second layer 320 . The bonding layer including the primer may improve bonding strength while allowing the first layer 310 and the second layer 320 to be bonded without gaps. When ultraviolet rays are irradiated toward the first layer 310, the UV molding liquid may be cured in response to the ultraviolet rays transmitted through the first layer 310, and thus, the first layer 310 may be coated with the second layer 310. A sheet with 320 attached thereto may be formed.

According to one embodiment, the third layer 330 may reinforce the display assembly 30 or 60 or the first layer 310 . The third layer 330 may include a substantially transparent polymer. Although not shown, in the embodiment of FIG. 3 , the third layer 330 includes a plurality of the first layer 310 and the second layer 320 by using an optical transparent adhesive member such as OCA, OCR, or SVR. It can be arranged on one side formed by the part located in the openings 401 . Although not shown, in the embodiment of FIG. 6 , the third layer 330 may be disposed on the first layer 310 by using an optically transparent adhesive member. The third layer 330 may have a shape (eg, thickness) and/or physical properties (eg, hardness or ductility) so that the flexibility of the folding cover area F of the front cover 101 is not lowered below a specified level. there is. When the electronic device 1 is converted from a folded state to an unfolded state, the third layer 330 may have elasticity contributing to restore the front cover 101 without substantially plastic deformation.

According to one embodiment, the fourth layer 340 may be disposed on the third layer 330 to form the first surface 301 of the front cover 101 . Although not shown, the fourth layer 340 may be disposed on the third layer 330 using an optical transparent adhesive member such as OCA, OCR, or SVR. The fourth layer 340 is, for example, a transparent coating layer and may be a final layer to cleanly protect the front cover 101 from the outside. The transparent coating layer may include a clear layer, and may include, for example, a UV clear layer formed of a UV curing material. The fourth layer 340 may be resistant to external impact (or scratches). The fourth layer 340 may have a shape (eg, thickness) and/or physical properties (eg, hardness or ductility) so that the flexibility of the folding cover area F of the front cover 101 is not lowered below a specified level. there is. When the electronic device 1 is converted from a folded state to an unfolded state, the fourth layer 330 may have elasticity contributing to restore the front cover 101 without substantially plastic deformation. In some embodiments, the third layer 330 may include an optical adhesive member.

According to some embodiments, although not shown, layers having various functions disposed on the fourth layer 340 to form the front surface 10A of the electronic device 1 may be further added.

According to an embodiment, when the first layer 310 is implemented to substantially form the front surface 10A of the electronic device 1, the third layer 330 and the fourth layer 340 in the embodiment of FIG. 6 ) can be omitted.

According to one embodiment, a plurality of layers included in the front cover 101 (eg, a first layer 310, a second layer 320, a third layer 330, a fourth layer 340, or Two layers bonded to each other among the optically transparent members between any two layers may be implemented by including a material capable of reducing a difference in refractive index between them. For example, if the difference in refractive index between the two layers is reduced, the reflectance of the interface between the two layers can be reduced, thereby reducing reflection at the interface and loss of light due to this, so that a clearer image can be seen through the screen. there is. A difference in refractive index between the two layers may be, for example, about 0.01 or less, which corresponds to a level of displaying a clear image.

According to one embodiment, a plurality of layers included in the front cover 101 (eg, a first layer 310, a second layer 320, a third layer 330, a fourth layer 340, or Two layers bonded to each other among the transparent optical member between any two layers may be bonded substantially without an air gap. For example, since an air gap may cause loss of light from the flexible display 20 and thus deterioration of image quality, the second layer 320, the third layer 330, or the fourth layer 340 may be formed through a method of curing after applying a material in the form of a liquid, thereby reducing the occurrence of air gaps.

According to an embodiment, the optically transparent adhesive member 350 may include a material capable of reducing a difference in refractive index between the front cover 101 and the flexible display 20 .

Referring to FIG. 5 , in one embodiment, the flexible display 20 may include a display panel 21 , a base film 22 , a lower panel 23 , and/or an optical layer 24 . The display panel 21 may be positioned between the optical layer 24 and the base film 22 . The base film 22 may be positioned between the display panel 21 and the lower panel 23 . The optical layer 24 may be positioned between the optically transparent adhesive member 350 and the display panel 21 . Between the display panel 21 and the base film 22, between the base film 22 and the lower panel 23, and/or between the display panel 21 and the optical layer 24 are adhesive members of various polymers. (not shown) may be disposed. The display panel 21 includes, for example, a light emitting layer 21a, a thin film transistor (TFT) film 21b, and/or an encapsulation layer (eg, thin-film encapsulation (TFE)) 21c. can include The light emitting layer 21a may include, for example, a plurality of pixels implemented with a light emitting device such as OLED or micro LED. The light emitting layer 21a may be disposed on the TFT film 21b through organic evaporation. A TFT film 21b may be positioned between the light emitting layer 21a and the base film 22 . The TFT film 21b may refer to a film structure in which at least one TFT is disposed on a flexible substrate (eg, a PI film) through a series of processes such as deposition, patterning, and etching. . At least one TFT can control the current to the light emitting element of the light emitting layer 21a to turn on or off the pixel or adjust the brightness of the pixel. The at least one TFT may be implemented as, for example, an amorphous silicon (a-Si) TFT, a liquid crystalline polymer (LCP) TFT, a low-temperature polycrystalline oxide (LTPO) TFT, or a low-temperature polycrystalline silicon (LTPS) TFT. can The display panel 21 may include a storage capacitor, which maintains a voltage signal to a pixel, maintains a voltage input to a pixel within one frame, or changes gate voltage of a TFT due to leakage current during light emission time. can reduce By a routine (eg, initialization, data write) for controlling at least one TFT, the storage capacitor may maintain the voltage applied to the pixel at regular time intervals. In one embodiment, the display panel 21 may be implemented based on OLED, and the encapsulation layer 21c may cover the light emitting layer 21a. Since organic materials and electrodes that emit light in OLEDs react very sensitively to oxygen and/or moisture and lose their light-emitting properties, the encapsulation layer 21c is a light-emitting layer 21a to prevent oxygen and/or moisture from penetrating into the OLED. ) can be sealed. The encapsulation layer 31c may serve as a pixel protection layer for protecting a plurality of pixels of the light emitting layer 31a. The base film 22 may include a flexible film formed of a polymer or plastic such as polyimide or polyester (PET). The base film 32 may serve to support and protect the display panel 21 . In some embodiments, the base film 22 may be referred to as a 'protective film', a 'back film', or a 'back plate'. The lower panel 23 may include a plurality of layers for various functions. Various polymeric adhesive members (not shown) may be disposed between the plurality of layers included in the lower panel 23 . The lower panel 23 may include, for example, a light blocking layer 23a, a buffer layer 23b, or a lower layer 23c. The light blocking layer 23a may be positioned between the base film 22 and the buffer layer 23b. The buffer layer 23b may be positioned between the light blocking layer 23a and the lower layer 23c. The light blocking layer 23a may block at least a portion of light incident from the outside. For example, the light blocking layer 23a may include an embo layer. The embossing layer may be a black layer including a bumpy pattern. The buffer layer 23b may alleviate external shock applied to the flexible display 20 . For example, the buffer layer 23b may include a sponge layer or a cushion layer. The lower layer 23c may diffuse, disperse, or dissipate heat generated from the electronic device 1 or the flexible display 20 . The lower layer 23c may absorb or shield electromagnetic waves. The lower layer 23c may alleviate external impact applied to the electronic device 1 or the flexible display 20 . For example, the lower layer 23c may include a composite sheet 23d or a conductive sheet 23e. In one embodiment, the composite sheet 23d may be a sheet processed by combining layers or sheets having different properties. For example, the composite sheet 23d may include at least one of polyimide and graphite. The composite sheet 23d may be replaced with a single sheet containing one material (eg, polyimide or graphite). The composite sheet 23d may be positioned between the buffer layer 23b and the conductive sheet 23e. The conductive sheet 23e may reduce or shield electromagnetic interference (EMI) of the flexible display 20 . The conductive sheet 23e may include copper, but is not limited thereto, and may include various other metal materials. In some embodiments, at least a portion of the lower layer 23c is a conductive member (eg, a metal plate), which may help to reinforce the rigidity of the electronic device 1, shield ambient noise, and heat dissipate components around it. (eg, a display driving circuit (eg, DDI)) may be used to dissipate heat emitted from the heat. The conductive member may include, for example, at least one of Cu (copper), aluminum (Al (aluminum)), SUS (stainless steel), or CLAD (eg, a laminated member in which SUS and Al are alternately disposed). can include The lower layer 23c may include various layers for various other functions. In some embodiments (not shown), at least one additional polymer layer (eg, a layer including PI, PET, or TPU) may be disposed on the rear surface of the display panel 21 in addition to the base film 22 . In various embodiments, at least one of the plurality of layers included in the lower panel 23 (eg, the light blocking layer 23a, the buffer layer 23b, the composite sheet 23d, and the conductive sheet 23e) may be omitted. may be In some embodiments, the arrangement order of the plurality of layers included in the lower panel 23 is not limited to the illustrated example and may be variously changed. The optical layer 24 may include, for example, a polarizing layer (or polarizer) or a retardation layer (or retarder). The polarization layer and the retardation layer can improve the outdoor visibility of the screen. For example, the optical layer 24 may selectively pass light generated from a light source of the display panel 21 and vibrating in a certain direction. In some embodiments, one layer in which a polarization layer and a retardation layer are combined may be provided, and this layer may be defined as a 'circular polarization layer'. In some embodiments, the polarization layer (or circular polarization layer) may be omitted, and in this case, a black pixel define layer (PDL) and/or color filter may be included in place of the polarization layer. In one embodiment, the flexible display 20 may include a touch sensing circuit (eg, a touch sensor) (not shown). The touch sensing circuit may be implemented with a transparent conductive layer (or film) based on various conductive materials such as indium tin oxide (ITO). For example, the touch sensing circuit may be disposed between the front cover 101 and the optical layer 24 (eg, an add-on type). For another example, the touch sensing circuit may be disposed between the optical layer 24 and the display panel 21 (eg, an on-cell type). For another example, the display panel 21 may include a touch sensing circuit or a touch sensing function (eg, an in-cell type). In one embodiment (not shown), the flexible display 20 is a metal mesh (eg, aluminum) as a touch sensing circuit disposed on the encapsulation layer 21c between the encapsulation layer 21c and the optical layer 24 metal mesh). For example, in response to bending of the flexible display 20 , the metal mesh may have greater durability than a transparent conductive layer made of ITO. In some embodiments, the flexible display 20 may further include a pressure sensor (not shown) capable of measuring the intensity (pressure) of a touch. A plurality of layers included in the display panel 21 or the lower panel 23, their stacking structure or stacking order may vary. The flexible display 20 may be implemented by omitting some of the components or adding other components according to a provision form or a convergence trend. In one embodiment, an electromagnetic induction panel (eg, digitizer) 501 may be positioned between the buffer layer 23b and the lower layer 23c. In some embodiments, the electromagnetic induction panel 501 may be positioned between the composite sheet 23d and the conductive sheet 23e of the lower layer 23c. In some embodiments, the electromagnetic induction panel 501 may be positioned between the light blocking layer 23a and the buffer layer 23b. The electromagnetic induction panel 501 may be implemented in a form such as a flexible film or a flexible sheet. The electromagnetic induction panel 501 may be formed of, for example, a flexible printed circuit board. When AC is supplied to the electromagnetic induction panel 501, an electromagnetic field may be formed by a plurality of electrode patterns included in the electromagnetic induction panel 501. The pen input device may be implemented using an electromagnetic induction method (eg, an electro magnetic resonance (EMR) method). The pen input device includes a resonance circuit, and the resonance circuit may be interlocked with the electromagnetic induction panel 501 . When the pen tip of the pen input device approaches the front surface 10A of the electronic device 1, current may flow through electromagnetic induction in a coil included in the resonant circuit of the pen input device. The pen input device uses energy supplied from the electromagnetic induction panel 501 to generate a signal (eg, a radio frequency signal) (eg, a position signal, a pen pressure signal, and/or an angle signal) related to a user input on the screen to display the screen. (eg, the electromagnetic induction panel 501). The electromagnetic induction panel 501 may include a shielding sheet. The shielding sheet may be positioned on the rear side of the flexible printed circuit board including the plurality of electrode patterns (eg, the side of the flexible printed circuit board facing the conductive sheet 23e in the illustrated embodiment). The shielding sheet may prevent interference between the components included in the electronic device 1 by electromagnetic fields generated from the components included in the electronic device 1 . The shielding sheet blocks electromagnetic fields generated from the components so that an input from the pen input device is accurately transferred to a coil included in the electromagnetic induction panel 501 . In some embodiments, the electromagnetic induction panel 501 may be defined or interpreted as a component included in the flexible display 20 . According to some embodiments, the pen input device may be implemented using an active electrical stylus (AES) method or an electric coupled resonance (ECR) method. In this case, the electromagnetic induction panel 501 can be omitted.

According to one embodiment, the support sheet 502 may be disposed on the rear surface of the flexible display 20 . For example, the support sheet 502 may be disposed on the rear surface of the lower panel 23 included in the flexible display 20 . The support sheet 502 may contribute to durability of the display assembly 30 or the flexible display 20 . The support sheet 502 is, for example, a load or stress that may occur when the electronic device 1 is switched between an unfolded state (see FIG. 1 ) and a folded state (see FIG. 2 ) affects the flexible display 20 . impact can be reduced. The support sheet 502 may be formed of a variety of metallic and/or non-metallic materials (eg, polymers). The support sheet 502 may include, for example, stainless steel. For another example, the support sheet 502 may include engineering plastic. In some embodiments, the support sheet 502 may be integrally implemented with the flexible display 20 .

According to one embodiment, the support sheet 502 may include a lattice structure formed in a portion corresponding to the folding cover area F of the front cover 101 . The grating structure may include, for example, a plurality of openings (or slits). For example, a plurality of openings may be formed periodically, have substantially the same shape, and may be repeatedly arranged at regular intervals. In some embodiments, a lattice structure including a plurality of openings may be referred to as an 'opening pattern'. The lattice structure may contribute to flexibility of a portion of the display assembly 30 corresponding to the folding cover area F. In some embodiments, the support sheet 502 may include a recess pattern (not shown) including a plurality of recesses, replacing the lattice structure. In various embodiments, the lattice structure or the recess pattern contributing to the flexibility of the flexible display 20 may further extend to other parts. In some embodiments, the support sheet 502 including a lattice structure or a recessed pattern, or a conductive member corresponding thereto, may be formed of a plurality of layers. In some embodiments, the support sheet 502 may be omitted or may be defined or interpreted as a component included in the flexible display 20 .

According to an embodiment, the fourth pattern 40 of the first layer 310 included in the front cover 101 includes a plurality of openings 401 based on a fourth pitch (or fourth spacing) P4. ) (see Fig. 3) or a plurality of recesses 601 (see Fig. 6) may be arranged. The fourth pitch P4 may refer to an interval at which openings or recesses having a substantially constant shape are periodically and repeatedly arranged. Referring to the embodiment of FIG. 3 in which the display assembly 30 is unfolded, the plurality of openings 401 are formed in a direction substantially perpendicular to the folding axis A with respect to the fourth pitch P4 (for example, x-axis direction). Referring to the embodiment of FIG. 6 in which the display assembly 30 is unfolded, the plurality of recesses 601 are formed in a direction substantially perpendicular to the folding axis A based on the fourth pitch P4 (eg, : x-axis direction).

According to some embodiments, the fourth pattern 40 of the first layer 310 is not limited to the illustrated example and may vary. For example, the fourth pattern 40 may include a first sub-pattern in which first openings or first recesses of a first shape are arranged at a pitch of a first value in a first direction, and a second pattern different from the first shape. The opening or the second recess may be modified to include a second sub-pattern arranged with a pitch of a first value or a second value different from the first value in a second direction different from the first direction. For another example, the fourth pattern 40 may be modified in a form in which identical openings or recesses are arranged in the same or different pitches in at least two or more directions (eg, mutually perpendicular directions). The shape of the fourth pattern 40 may be formed in various ways to secure flexibility of the first layer 310 .

According to an embodiment, the fourth pattern 40 of the first layer 310 is formed to reduce a moire phenomenon when light is output from a plurality of sub-pixels included in the display panel 21. can The moiré phenomenon occurs, for example, when light is output from a plurality of sub-pixels included in the display panel 21, the fourth pattern 40 of the first layer 310 causes interference of light, resulting in a pattern of a certain pattern. (e.g., moiré pattern) may indicate a phenomenon that is recognized. The plurality of subpixels may include, for example, a plurality of first subpixels outputting light of a first color among three primary colors, a plurality of second subpixels outputting light of a second color among three primary colors, and a plurality of third sub-pixels outputting light of a third color among the three primary colors. The plurality of first subpixels, for example, the plurality of openings 401 or the plurality of recesses 601 included in the fourth pattern 40 of the first layer 310 have a fourth pitch (P4). ) may form a first pattern arranged at a first pitch (or first spacing) in substantially the same direction as the direction in which the elements are arranged. The plurality of second subpixels, for example, the plurality of openings 401 or the plurality of recesses 601 included in the fourth pattern 40 of the first layer 310 have a fourth pitch (P4). ), second patterns arranged at a second pitch (or second spacing) may be formed in substantially the same direction as the direction in which the patterns are arranged. The plurality of third subpixels, for example, the plurality of openings 401 or the plurality of recesses 601 included in the fourth pattern 40 of the first layer 310 have a fourth pitch (P4). ) may form a third pattern arranged at a third pitch (or third spacing) in substantially the same direction as the direction in which the pattern is arranged. In an embodiment, a fourth spatial frequency vector formed by a fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and a plurality of first The spatial frequency vector formed through the convolution summation of the first spatial frequency vector formed by the first pitch of the first pattern for the subpixels is about 60 cycles/degree corresponding to the limit pitch that can be seen by humans. may be located within the visibility circle, and the moiré phenomenon may not substantially occur. In an embodiment, a fourth spatial frequency vector formed by the fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and the plurality of second sub-pixels are generated based on Fourier transform. The spatial frequency vector formed through the convolutional sum of the second spatial frequency vector formed due to the second pitch of the second pattern may be located within a visibility circle of about 60 cycles / degree corresponding to the limit pitch that a person can see. In addition, the moiré phenomenon may not substantially occur. In an embodiment, a fourth spatial frequency vector formed by the fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and the plurality of third subpixels are generated based on Fourier transform. The spatial frequency vector formed through the convolutional sum of the third spatial frequency vector formed by the third pitch of the third pattern of the third pattern may be located within the visibility circle of about 60 cycles / degree corresponding to the limit pitch that can be seen by humans. In addition, the moiré phenomenon may not substantially occur.

FIG. 7 shows a cross-sectional structure 700 in the x-z plane of the display assembly 70 included in the electronic device 1 with respect to line C-C′ in FIG. 1 in another embodiment.

Referring to FIG. 7 , compared to the cross-sectional structure 300 of FIG. 3 , the second layer 320 may not include a portion filled in the plurality of openings 401 of the first layer 310 . The display assembly 30 may include a material filled in the plurality of openings 401 of the first layer 310 . A material filled in the plurality of openings 401 may be substantially transparent. The plurality of openings 401 may be filled with a material (eg, a flexible polymer material) that does not degrade the flexibility of the first layer 310 . The material filling the plurality of openings 401 may reinforce the first layer 310 . Impact resistance or durability of the first layer 310 may be reinforced by a material filling the plurality of openings 401 . The material filled in the plurality of openings 401 is bent in correspondence with the folding cover area F of the front cover 101 of the first layer 310 in the folded state of the electronic device 1 (see FIG. 2 ). Bending stress occurring in the region can be alleviated. Since the bending stress generated in the first layer 310 due to repeated switching between the unfolded state and the folded state of the electronic device 1 may cause damage by deterioration or loss of elasticity due to fatigue accumulation, the plurality of openings The material filled in 401 may alleviate bending stress generated in the first layer 310 .

According to an embodiment, the material filled in the plurality of openings 401 of the first layer 310 has a difference in refractive index from that of the material included in the first layer 310, a difference in refractive index from that of the second layer 320, and/or a material capable of reducing loss of light by reducing a refractive index difference with the third layer 330 .

According to an embodiment, a material filled in the plurality of openings 401 may be different from a material included in the second layer 320 . In some embodiments, the material filling the plurality of openings 401 may be the same as the material included in the second layer 320 .

According to some embodiments, the second layer 320 may be omitted.

FIG. 8 shows a cross-sectional structure 800 in the x-z plane according to another embodiment in which the second layer 320 is modified, for example, in the embodiment of FIG. 7 .

Referring to FIG. 8 , the display assembly 30 may include a plurality of openings 401 penetrating between the second surface 302 and the third surface 303 . The plurality of openings 401 include a plurality of first openings formed in the first layer 310 and a plurality of second openings 801 formed in the second layer 320 to be aligned with the first openings. can do. When viewed from the top of the first surface 301 in an unfolded state of the display assembly 70, the plurality of first openings of the first layer 310 and the plurality of second openings 801 of the second layer 320 can be nested.

According to one embodiment, the display assembly 30 may include a material filled in the plurality of openings 401 . A material filled in the plurality of openings 401 may be substantially transparent. The plurality of openings 401 may be filled with a material (eg, a flexible polymer material) that does not deteriorate the flexibility of the first layer 310 or the display assembly 300 . The material filling the plurality of openings 401 may reinforce the first layer 310 . Impact resistance or durability of the first layer 310 may be reinforced by a material filling the plurality of openings 401 . The material filled in the plurality of openings 401 is bent in correspondence with the folding cover area F of the front cover 101 of the first layer 310 in the folded state of the electronic device 1 (see FIG. 2 ). Bending stress occurring in the region can be alleviated. Since the bending stress generated in the first layer 310 due to repeated switching between the unfolded state and the folded state of the electronic device 1 may cause damage by deterioration or loss of elasticity due to fatigue accumulation, the plurality of openings The material filled in 401 may alleviate bending stress generated in the first layer 310 .

According to an embodiment, the material filled in the plurality of openings 401 of the first layer 310 has a difference in refractive index from that of the material included in the first layer 310, a difference in refractive index from that of the second layer 320, It may be a material capable of reducing loss of light by reducing a difference in refractive index with the third layer 330 and a difference in refractive index with the fifth layer 350 .

According to an embodiment, a material filled in the plurality of openings 401 may be different from a material included in the second layer 320 . In some embodiments, the material filling the plurality of openings 401 may be the same as the material included in the second layer 320 .

FIG. 9 illustrates positions between a grid structure included in the front cover 101 and a plurality of subpixels 900 included in the flexible display 20 in an open state of the electronic device 1, in an embodiment. It is an x-y plane view showing the relationship. FIG. 10 is an enlarged view of a portion indicated by reference numeral 901' in FIG. 9 , for example.

Referring to FIGS. 9 and 10 , the plurality of subpixels 900 include a red subpixel R outputting red light (or expressing red color) and a green light outputting (or green color). It may include a plurality of green sub-pixels (G) that express , and blue sub-pixels (B) that output blue light (or express blue color). The plurality of subpixels 900 may be included in, for example, the light emitting layer 21a (see FIG. 5 ) of the display panel 21 . In one embodiment, one pixel (or unit pixel) may be implemented with three sub-pixels, for example, a red sub-pixel (R), a green sub-pixel (G), and a blue sub-pixel (B). . In some embodiments, an arrangement of the plurality of subpixels 900 may be implemented differently from the illustrated example. For example, one pixel may be implemented with two sub-pixels, eg, a red sub-pixel (R) and a green sub-pixel (G), and a blue sub-pixel (B) and a green sub-pixel (G). , and the arrangement of the plurality of subpixels 900 may be modified differently from the illustrated example. Light output from the red sub-pixel R, light output from the green sub-pixel G, and light output from the blue sub-pixel B may have different wavelengths.

According to an embodiment, the red sub-pixel R may include, for example, a plurality of openings 401 included in the fourth pattern 40 of the first layer 310 (see FIGS. 3, 7, or 8). ) or a first pitch (or first spacing) in substantially the same direction as the direction in which the plurality of recesses 601 (see FIG. 6) are arranged at the fourth pitch (or fourth spacing) (P4) ( A first pattern arranged in P1) may be formed. In the green sub-pixel G, for example, the plurality of openings 401 or the plurality of recesses 601 included in the fourth pattern 40 of the first layer 310 have a fourth pitch P4 ), a second pattern arranged at a second pitch (or second interval) P2 may be formed in substantially the same direction as the direction in which the pattern is arranged. In the third sub-pixel, for example, the plurality of openings 401 or the plurality of recesses 601 included in the fourth pattern 40 of the first layer 310 have a fourth pitch P4. A third pattern arranged at a third pitch (or third interval) P3 in substantially the same direction as the arrangement direction may be formed. The first pitch P1, the second pitch P2, or the third pitch P3 may be about 30 μm to about 300 μm, but is not limited thereto.

According to an embodiment, a fourth spatial frequency vector formed by a fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and a plurality of subpixels 900 based on Fourier transform. ), the spatial frequency vector formed through the convolutional sum of the first spatial frequency vector formed by the first pitch P1 of the first pattern for the red sub-pixel R of It may be located within a visibility circle of about 60 cycles/degree, and the moiré phenomenon may not substantially occur. In an exemplary embodiment, the fourth pitch P4 is formed to be greater than the first pitch P1 to reduce the moiré phenomenon. For example, the first pitch (P1) is formed to a value corresponding to about 0.01 to about 0.8 compared to the fourth pitch (P4) when based on the spatial frequency vector based on the Fourier transform, thereby reducing the moiré phenomenon. can In some embodiments, the ratio of the first pitch P1 to the fourth pitch P4 may not be limited to the above value.

According to an embodiment, a fourth spatial frequency vector formed by a fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and a plurality of subpixels 900 based on Fourier transform. ), the spatial frequency vector formed through the convolutional sum of the second spatial frequency vector formed by the second pitch P2 of the second pattern for the green sub-pixel G corresponds to the limit pitch that can be visually recognized by humans. It may be located within a visibility circle of about 60 cycles/degree, and the moiré phenomenon may not substantially occur. In one embodiment, the fourth pitch P4 is formed to be greater than the second pitch P2 to reduce the moiré phenomenon. For example, the second pitch (P2) is formed to a value corresponding to about 0.01 to about 0.8 compared to the fourth pitch (P4), based on the spatial frequency vector based on the Fourier transform, to reduce the moire phenomenon. can In some embodiments, the ratio of the second pitch P2 to the fourth pitch P4 may not be limited to the above value.

According to an embodiment, a fourth spatial frequency vector formed by a fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and a plurality of subpixels 900 based on Fourier transform. ), the spatial frequency vector formed through the convolutional sum of the third spatial frequency vector formed by the third pitch P3 of the third pattern for the blue sub-pixel B corresponds to the limiting pitch that can be visually recognized by humans. It may be located within a visibility circle of about 60 cycles/degree, and the moiré phenomenon may not substantially occur. In an exemplary embodiment, the fourth pitch P4 is formed to be greater than the third pitch P3 to reduce the moiré phenomenon. For example, the third pitch (P3) is formed to a value corresponding to about 0.01 to about 0.8 compared to the fourth pitch (P4) when based on the spatial frequency vector based on the Fourier transform, thereby reducing the moire phenomenon. can In some embodiments, the ratio of the third pitch P3 to the fourth pitch P4 may not be limited to the above value.

According to one embodiment, the plurality of openings 401 (see FIG. 3 ) or the plurality of recesses 601 included in the fourth pattern 40 of the first layer 310 include an edge E. can do. The edge E of the fourth pattern 40 has a plurality of openings 401 or a plurality of openings 401 in a direction substantially parallel to the display panel 21 (see FIG. 5 ) including the plurality of subpixels 900 . It may refer to the edge shape of the recesses 601 . The edge E of the fourth pattern 40 is included in the plurality of openings 401 substantially perpendicular to the third face 303 or the fourth face 304 in the embodiment of FIG. 3 , for example. It can correspond to the face (e.g., the inner face). The first layer 310 may be formed as a thin film having a thickness of about 30 μm to about 1000 μm, and the surface included in the plurality of openings 401 is the width of the plurality of openings 401 . It can be interpreted as having an insignificant height. In some embodiments, various other terms may be used in place of the term 'edge'.

According to an embodiment, an arrangement direction for a red subpixel R, a green subpixel G, or a blue subpixel B in the plurality of subpixels 900 may be defined. The arrangement direction of the plurality of sub-pixels 900 is, for example, a separation distance that can output light of the same wavelength (or the same color) and substantially affect each other (eg, light interference). It can be defined based on a combination of two adjacently located sub-pixels. For example, a plurality of red subpixels outputting light of a first wavelength of red color, green subpixels outputting light of a second wavelength of green color, and light of a third wavelength of blue color. As shown, the arrangement directions of the red subpixels include the first arrangement direction (①), the second arrangement direction (②), the third arrangement direction (③), and/or the fourth arrangement direction (④). can include

According to an embodiment, in order to reduce the moiré phenomenon, the edge E of the fourth pattern 40 included in the first layer 310 is arranged in a first arrangement direction ① with respect to the plurality of subpixels 900. , may be formed not substantially parallel to the second arrangement direction (②), the third arrangement direction (③), and the fourth arrangement direction (④). A plurality of sub-pixels corresponding to the first array direction (①), the second array direction (②), the third array direction (③), or the fourth array direction (④) output light of the same wavelength so that they are adjacent to each other. Since it is possible to form a visual pattern capable of generating a moiré phenomenon with the fourth pattern 40 included in the first layer 310 due to the influence (eg, interference) between the two sub-pixels, the fourth pattern ( 40) may be formed not parallel to the first arrangement direction ①, the second arrangement direction ②, the third arrangement direction ③, and the fourth arrangement direction ④. In one embodiment, the edge E of the fourth pattern 40 may include at least one straight section (or straight line shape), and the at least one straight section of the edge E may be in the first arrangement direction (①). ), the second arrangement direction (②), the third arrangement direction (③), and the fourth arrangement direction (④) may not be substantially parallel. For example, the at least one straight section of the edge E may have a first array direction (①), a second array direction (②), a third array direction (③), or a fourth array direction (④) and a moiré phenomenon. It is possible to achieve a range of angles corresponding to a level that can prevent or reduce (eg, minimize) The range may form an angle of about 3 degrees or more from each axis of the first arrangement direction, the second arrangement direction, the third arrangement direction, and the fourth arrangement direction. In some embodiments, the range may not be limited to the angle. In one embodiment, the edge E of the fourth pattern 40 may include at least one curved section (or curved shape), and the at least one curved section of the edge E may be in the first arrangement direction (①). ), may not be parallel to the second arrangement direction (②), the third arrangement direction (③), and the fourth arrangement direction (④). The edge E of the fourth pattern 40 is formed substantially parallel to the first array direction (①), the second array direction (②), the third array direction (③), and the fourth array direction (④) In the case of the comparison example, it may be difficult to reduce the moiré phenomenon due to wavelength mismatching and/or refractive index difference.

11 is an x-y plan view of a first layer 310 including a fourth pattern according to another embodiment.

Referring to FIG. 11 , in one embodiment, the first layer 310 may have a fourth pattern including a plurality of openings 1101 having the same shape (eg, a diamond shape). The fourth pattern may include a first sub-pattern in which the plurality of openings 1101 are arranged in a fifth pitch P5 in a first direction (eg, a y-axis direction parallel to the folding axis A). The fourth pattern may include a second sub-pattern in which the plurality of openings 1101 are arranged in a second direction perpendicular to the first direction in a sixth pitch P6.

According to an embodiment, in order to reduce a moiré phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5 ), a plurality of red sub-pixels included in the display panel 21 , a plurality of green subpixels, or a plurality of blue subpixels are substantially aligned with the direction in which the plurality of openings 1101 included in the first subpattern of the first layer 310 are arranged in the fifth pitch P5. It may be arranged to form a pattern arranged at a pitch smaller than the fifth pitch P5 in the same direction.

According to an embodiment, in order to reduce a moiré phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5 ), a plurality of red sub-pixels included in the display panel 21 , a plurality of green subpixels, or a plurality of blue subpixels are substantially aligned with the direction in which the plurality of openings 1101 included in the second subpattern of the first layer 310 are arranged in the sixth pitch P6. It may be arranged to form a pattern arranged at a pitch smaller than the sixth pitch P6 in the same direction.

According to an embodiment, in order to reduce a moire phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5 ), the edges of the plurality of openings 1101 are formed by the display panel 21 Arrangement directions for a plurality of subpixels included in ) (e.g., the first arrangement direction (①), the second arrangement direction (②), the third arrangement direction (③), and the fourth arrangement direction ( ④)) and may be formed substantially non-parallel.

12 is an x-y plan view of a first layer 310 including a fourth pattern according to another embodiment.

Referring to FIG. 12 , in one embodiment, the fourth pattern of the first layer 310 includes a plurality of first openings 1201 of a first shape in a first direction (eg, perpendicular to the folding axis A). x-axis direction) may include a first sub-pattern arranged at a seventh pitch P7. The fourth pattern of the first layer 310 may include a second sub-pattern in which the plurality of second openings 1202 of the second shape are arranged in the eighth pitch P8 in the first direction. The fourth pattern of the first layer 310 may include a third sub-pattern in which a plurality of third openings 1203 of a third shape are arranged in a ninth pitch P9 in the first direction. In the fourth pattern of the first layer 310, the plurality of first openings 1201 of the first shape are formed in a second direction perpendicular to the first direction (eg, a y-axis direction parallel to the folding axis A). may include a fourth sub-pattern arranged as an 11th patch P11. The fourth pattern of the first layer 310 includes a fifth sub-pattern in which the plurality of second openings 1202 of the second shape are arranged in a twelfth patch P12 in a second direction perpendicular to the first direction. can include The fourth pattern of the first layer 310 includes a sixth sub-pattern in which a plurality of third openings 1203 of a third shape are arranged in a twelfth patch P12 in a second direction perpendicular to the first direction. can include

According to an embodiment, in order to reduce a moiré phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5 ), a plurality of red sub-pixels included in the display panel 21 , a plurality of green subpixels, or a plurality of blue subpixels are arranged in the direction in which the plurality of first openings 1201 included in the first subpattern of the first layer 310 are arranged in the seventh pitch P7. It may be arranged to form a pattern arranged in substantially the same direction at a pitch smaller than the seventh pitch P7.

According to an embodiment, in order to reduce a moiré phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5 ), a plurality of red sub-pixels included in the display panel 21 , the plurality of green subpixels, or the plurality of blue subpixels are arranged in the direction in which the plurality of second openings 1202 included in the second subpattern of the first layer 310 are arranged in the eighth pitch P8. It may be arranged to form a pattern arranged at a pitch smaller than the eighth pitch P8 in substantially the same direction.

According to an embodiment, in order to reduce a moiré phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5 ), a plurality of red sub-pixels included in the display panel 21 , a plurality of green subpixels, or a plurality of blue subpixels are arranged in the direction in which the plurality of third openings 1203 included in the third subpattern of the first layer 310 are arranged in the ninth pitch P9. It may be arranged to form a pattern arranged in substantially the same direction at a pitch smaller than the ninth pitch P9.

According to an embodiment, in order to reduce a moiré phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5 ), a plurality of red sub-pixels included in the display panel 21 , a plurality of green subpixels, or a plurality of blue subpixels are arranged in the direction in which the plurality of first openings 1201 included in the fourth subpattern of the first layer 310 are arranged in the tenth pitch P10. It may be arranged to form a pattern arranged in substantially the same direction at a pitch smaller than the tenth pitch P10.

According to an embodiment, in order to reduce a moiré phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5 ), a plurality of red sub-pixels included in the display panel 21 , the plurality of green subpixels, or the plurality of blue subpixels are arranged in the direction in which the plurality of second openings 1202 included in the fifth subpattern of the first layer 310 are arranged in the eleventh pitch P11. It may be arranged to form a pattern arranged in substantially the same direction at a pitch smaller than the 11th pitch P11.

According to an embodiment, in order to reduce a moiré phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5 ), a plurality of red sub-pixels included in the display panel 21 , a plurality of green subpixels, or a plurality of blue subpixels are arranged in the direction in which the plurality of third openings 1203 included in the sixth subpattern of the first layer 310 are arranged in the twelfth pitch P12. It may be arranged to form a pattern arranged at a pitch smaller than the twelfth pitch P12 in substantially the same direction.

According to an embodiment, in order to reduce a moire phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5 ), the edges of the plurality of first openings 1201, the plurality of The edges of the second openings 1202 and the edges of the plurality of third openings 1203 correspond to the arrangement directions of the plurality of sub-pixels included in the display panel 21 (eg, the first arrangement of FIG. 8 ). direction (①), the second arrangement direction (②), the third arrangement direction (③), and the fourth arrangement direction (④)).

According to various embodiments, the fourth pattern included in the first layer 310 reduces the moiré phenomenon due to the influence of light between the first layer 310 and the display panel 21 (see FIG. 5), and has flexibility. It can be implemented in various other forms that can secure.

According to an embodiment of the present document, an electronic device (eg, electronic device 1 of FIG. 1 ) includes a front surface (eg, front surface 10A of FIG. 1 ) and a rear surface (eg, electronic device 1 of FIG. 1 ) of the electronic device. It may include a foldable housing (eg, the foldable housing 10 of FIG. 1 ) forming the rear surface 10B of FIG. 1 . The electronic device may include a flexible display (eg, the flexible display 20 of FIGS. 3 or 6) located in the inner space of the foldable housing. The flexible display is combined with a front cover (eg, the front cover 101 of FIGS. 3 or 6) forming the front side of the foldable housing and can be viewed through the front cover. The front cover has a plurality of openings corresponding to the foldable portion of the foldable housing (eg, the plurality of openings 401 of FIGS. 3, 7, or 8) or a surface facing the flexible display. A pattern in which a plurality of recesses (eg, the plurality of recesses 601 of FIG. 6 ) are periodically formed (eg, the pattern 40 of FIG. 4 or 10 ) may be included. The plurality of openings or the plurality of recesses may be periodically arranged at a first interval (eg, the fourth pitch P4 of FIGS. 3, 6, 7, or 8). In the flexible display, a plurality of subpixels emitting light of the same wavelength may be arranged in the same direction as a direction in which the plurality of openings or the plurality of recesses are periodically arranged. The first interval may be larger than the second interval (eg, the first pitch P1, the second pitch P2, or the third pitch P3 of FIG. 10) in which the plurality of subpixels are periodically arranged. .

According to one embodiment of the present document, the second interval (eg, the first pitch P1, the second pitch P2, or the third pitch P3 of FIG. 10 versus the first interval (eg, FIG. 3 ) , 6, 7, or 8, the ratio of the fourth pitch P4) may be 0.01:1 to 0.8:1.

According to one embodiment of the present document, the plurality of openings (eg, the plurality of openings 401 of FIGS. 3, 7, or 8) or the plurality of recesses in at least one direction parallel to the flexible display. The shape of the edge (eg, the edge E of FIG. 10) of the plurality of recesses 601 of FIG. 6 (eg, the plurality of recesses 601 in FIG. 6) is such that a plurality of sub-pixels outputting light of the same wavelength among the flexible displays periodically It may be formed non-parallel to one or more of the directions in which it is arranged.

According to one embodiment of the present document, the plurality of openings (eg, the plurality of openings 401 of FIGS. 3, 7, or 8) or the plurality of recesses in at least one direction parallel to the flexible display. An edge shape (eg, edge E of FIG. 10 ) of the recesses 601 of FIG. 6 may include a straight section. The straight section may form an angle of 3 degrees or more with one or more directions in which a plurality of sub-pixels emitting light of the same wavelength are periodically arranged in the flexible display.

According to one embodiment of the present document, the plurality of openings (eg, the plurality of openings 401 of FIGS. 3, 7, or 8) or the plurality of recesses in at least one direction parallel to the flexible display. The shape of the edge (eg, the edge E of FIG. 10) of the plurality of recesses 601 of FIG. 6 (eg, the plurality of recesses 601 in FIG. 6) is such that a plurality of sub-pixels outputting light of the same wavelength among the flexible displays periodically It may further include a straight section or a curved section forming an angle of 3 degrees or more with one or more directions that are arranged.

According to an embodiment of the present document, the plurality of openings (eg, the plurality of openings 401 of FIG. 3, 7, or 8) or the plurality of recesses (eg, the plurality of recesses of FIG. 6 ) s 601) may be periodically arranged in a direction of a folding axis (eg, folding axis A of FIG. 1 ) of the foldable housing.

According to an embodiment of the present document, the plurality of openings (eg, the plurality of openings 401 of FIG. 3, 7, or 8) or the plurality of recesses (eg, the plurality of recesses of FIG. 6 ) s 601), when viewed in an unfolded state of the foldable housing, may be periodically arranged in a direction perpendicular to the folding axis (eg, folding axis A of FIG. 1) of the foldable housing. there is.

According to an embodiment of the present document, the plurality of subpixels may output red light, green light, or blue light.

According to one embodiment of the present document, the front cover (eg, the front cover 101 of FIGS. 3, 6, 7, or 8) is a first layer (eg, the first layer of FIGS. 3, 6, 7, or 8). layer 310). The first layer may include the pattern (eg, the pattern 40 of FIG. 4 or 10) and be formed of glass.

According to one embodiment of the present document, the first layer (eg, the first layer 310 of FIGS. 3, 6, 7, or 8) may have a thickness of 30 μm to 1000 μm.

According to an embodiment of the present document, the front cover (eg, the front cover 101 of FIG. 3 or 6) may include a second layer (eg, the second layer 320 of FIG. 3 or 6). . The second layer may be positioned between the first layer and the flexible display. The second layer includes a polymer, and includes the plurality of openings (eg, the plurality of openings 401 in FIG. 3 ) or the plurality of recesses (eg, the plurality of recesses 601 in FIG. 6 ). ) may include a part filled in.

According to one embodiment of the present document, the front cover (eg, the front cover 101 of FIGS. 3, 6, 7, or 8) is the front surface (eg, the front cover 10A of FIG. 1, or the front cover 101 of FIGS. 3 and 6). , 7, or 8) and a third layer of polymer positioned between the first layer (eg, first layer 310 of FIGS. 3, 6, 7, or 8) (eg, The third layer 330 of FIG. 3, 6, 7, or 8) may be further included.

According to an embodiment of the present document, the electronic device includes the second layer (eg, the second layer 320 of FIGS. 3, 6, 7, or 8) and the flexible display (eg, FIGS. 3, 6, 7, Alternatively, an optically transparent adhesive member (eg, the optically transparent adhesive member 350 of FIGS. 3, 6, 7, or 8) positioned between the flexible display 20 of FIG. 8 may be further included.

According to an embodiment of the present document, the foldable housing (eg, the foldable housing 10 of FIG. 1 ) has the front surface (eg, the figure of FIG. 1 ) based on a folding axis (eg, the folding axis (A) of FIG. 1 front face 10A) may be foldable inward.

According to another embodiment of the present document, the foldable housing (eg, the foldable housing 10 of FIG. 1 ) has the front surface (eg, the view) based on a folding axis (eg, the folding axis A of FIG. 1 ). 1 front (10A)) may be foldable out.

Embodiments disclosed in this document and drawings are only presented as specific examples to easily explain technical content and help understanding of the embodiments, and are not intended to limit the scope of the embodiments. Therefore, the scope of various embodiments of this document should be construed as including changes or modifications other than the embodiments disclosed herein within the scope of various embodiments of this document.

300: cross-sectional structure
30: display assembly
101: front cover
310: first layer
401: multiple openings
320: second layer
330: third layer
340: fourth layer
20: flexible display

Claims (15)

In electronic devices,
a foldable housing forming a front surface of the electronic device and a rear surface of the electronic device; and
A flexible display positioned in an inner space of the foldable housing, combined with a front cover forming the front surface of the foldable housing, and visible through the front cover;
The front cover includes a pattern in which a plurality of openings corresponding to the foldable portion of the foldable housing or a plurality of recesses formed on a surface facing the flexible display are periodically formed,
A plurality of subpixels emitting light of the same wavelength of the flexible display are arranged in the same direction as the direction in which the plurality of openings or the plurality of recesses are periodically arranged;
The first interval is larger than the second interval in which the plurality of subpixels are periodically arranged. According to claim 1,
The electronic device of claim 1, wherein a ratio of the second spacing to the first spacing is 0.01:1 to 0.8:1. According to claim 1,
An edge shape of the plurality of openings or the plurality of recesses in at least one direction parallel to the flexible display,
An electronic device in which a plurality of sub-pixels emitting light of the same wavelength are not parallel to one or more directions in which a plurality of sub-pixels are periodically arranged in the flexible display. According to claim 3,
an edge shape of the plurality of openings or the plurality of recesses in at least one direction parallel to the flexible display includes a straight section;
The straight section is
An electronic device forming an angle of 3 degrees or more with one or more directions in which a plurality of sub-pixels outputting light of the same wavelength are periodically arranged in the flexible display. According to claim 4,
The edge shape of the plurality of openings or the plurality of recesses in at least one direction parallel to the flexible display is one or more directions in which a plurality of subpixels emitting light of the same wavelength are periodically arranged in the flexible display. An electronic device further comprising a straight section or a curved section forming an angle of 3 degrees or more with the field. According to claim 1,
The plurality of openings or the plurality of recesses are periodically arranged in a direction of a folding axis of the foldable housing. According to claim 1,
The plurality of openings or the plurality of recesses are periodically arranged in a direction perpendicular to a folding axis of the foldable housing when viewed from an unfolded state of the foldable housing. According to claim 1,
The electronic device of claim 1 , wherein the plurality of sub-pixels output red light, green light, or blue light. According to claim 1,
The front cover includes a first layer including the pattern,
The electronic device of claim 1 , wherein the first layer is formed of glass. According to claim 9,
The first layer has a thickness of 30 μm to 1000 μm. According to claim 9,
the front cover further comprises a second layer of polymer positioned between the first layer and the flexible display;
The second layer includes a portion filled in the plurality of openings or the plurality of recesses. According to claim 9,
The electronic device of claim 1 , wherein the front cover further includes a third layer of polymer positioned between the front surface and the first layer. According to claim 9,
The electronic device further comprises an optically transparent adhesive member positioned between the second layer and the flexible display. According to claim 1,
The foldable housing is an electronic device capable of folding the front side inward with respect to a folding axis. According to claim 1,
The electronic device of claim 1 , wherein the foldable housing is foldable with the front side outward based on a folding axis.

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