KR20230049030A - Electronic device including flexible display - Google Patents

Abstract

In an example embodiment of the present specification, an electronic device may comprise a foldable housing and a flexible display. The foldable housing may provide a front surface of the electronic device and a rear surface of the electronic device. The flexible display may be situated within an internal space of the foldable housing. The flexible display may be combined with a front cover which provides the front surface of the electronic device in the foldable housing. The flexible display may be seen through the front cover. The front cover may include a pattern in which a plurality of openings corresponding to a folding portion of the foldable housing or a plurality of recesses provided on a surface facing the flexible display are periodically provided. A plurality of subpixels in the flexible display, which output light of the same wavelength, may be arranged in the same direction in which the plurality of openings or the plurality of recesses are periodically arranged. A first interval, at which the plurality of openings or the plurality of recesses are periodically arranged, may be larger than a second interval at which the plurality of subpixels are periodically arranged. The electronic device of the present invention can reduce visual quality degradation (such as moire) caused by a lattice structure located in a folding area of a screen.

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 the exemplary embodiments of the present document, an electronic device may include a foldable housing and a flexible display. The foldable housing may provide a front side of the electronic device and a rear side of the electronic device. The flexible display may be located in the inner space of the foldable housing. The flexible display may be combined with a front cover providing a front surface of the electronic device among the foldable housings. The flexible display can be seen through the front cover. The front cover may include a pattern in which a plurality of openings corresponding to the foldable portion of the foldable housing or a plurality of recesses provided on a surface facing the flexible display are periodically provided. A plurality of subpixels emitting light of the same wavelength in the flexible display 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 at which the plurality of openings or the plurality of recesses are periodically arranged may be greater than the second interval at 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 diagram illustrating an electronic device in an unfolded state, according to an exemplary embodiment.
2 is diagrams illustrating an electronic device in a folded state, according to an exemplary embodiment.
3 is a cross-sectional view of a display assembly included in an electronic device taken along line C-C′ in FIG. 1 according to an embodiment.
4 is a diagram illustrating a first layer included in a front cover in an unfolded state of an electronic device, according to an embodiment.
5 is a cross-sectional view of a flexible display included in the display assembly of FIG. 4 according to one embodiment.
6 is a cross-sectional view of a display assembly included in an electronic device taken along line C-C′ in FIG. 1 according to various embodiments.
7 is a cross-sectional view of a display assembly included in an electronic device taken along line C-C′ in FIG. 1 according to various embodiments.
8 is a cross-sectional view of a display assembly with a modified second layer in the embodiment of FIG. 7, according to various embodiments.
9 is a diagram illustrating a positional relationship between a lattice structure included in a front cover and a plurality of subpixels included in a flexible display in an unfolded state of an electronic device, according to an exemplary embodiment.
FIG. 10 is an enlarged view of a portion indicated by reference numeral 901 in FIG. 9 according to an embodiment.
11 is a diagram illustrating a first layer including a fourth pattern, according to various embodiments.
12 is a diagram illustrating a first layer including a fourth pattern, according to various embodiments.
13 is a perspective view of a test device for a first evaluation, a second evaluation, and a third evaluation, and a diagram illustrating the test device, according to one embodiment.
FIG. 14 is a graph showing a minimum surface compressive stress that the first layer should have so as not to substantially cause damage to the first layer according to a drop height of the pen input device, according to an embodiment.
FIG. 15 is a first evaluation of a laminate including the first layer of FIG. 3 according to an embodiment, and a drop height of a pen input device that causes breakage of the first layer according to a thickness of the first layer is measured. It is a graph that represents
16 is a diagram illustrating a test device and a first layer in relation to a first evaluation, and a diagram illustrating a test device and a first layer in relation to a second evaluation, according to one embodiment.
17 is a graph showing a drop height of a pen input device that causes breakage of a first layer according to a thickness of the first layer as a result of a first evaluation through a test device and through a test device according to an embodiment. As a result of the second evaluation, it is a graph showing the applied load through the pen input device that causes breakage of the first layer according to the thickness of the first layer.
18 is a graph showing the breaking load according to the thickness of the first layer as a result of the third evaluation through the test device, according to an 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 diagrams illustrating an electronic device 1 in an unfolded state (or flat state or unfolding state) according to an embodiment. 2 is diagrams illustrating an electronic device 1 in a folded state (or folding state), according to an exemplary embodiment.

1 and 2, in one embodiment, an electronic device (or foldable electronic device) 1 includes a foldable housing 10 and a flexible display (or a flexible display module, a bendable display, or a bendable display module) 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 an unfolded state of the foldable housing 10 (or electronic device 1), the front surface 10A may be substantially flat, and the first cover area ⓐ, the second cover area ⓑ, and folding The cover areas F may be oriented in substantially the same direction. 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 It can form an angle of about 180 degrees. In the folded state (see FIG. 2) of the foldable housing 10, the folding cover area F is disposed in a curved shape, and the first cover area ⓐ and the second cover area ⓑ have an angle of about 180 degrees. different angles can be achieved. The folded state may include a fully folded state or an intermediate state. The fully folded state (see FIG. 2 ) may be a 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. In the fully folded state, 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 completely 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 folded state (or may be defined or interpreted as a state between an unfolded state and a fully folded state). The folding cover area F of the front surface 10A may be more bent in a fully 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 (not separately shown).

According to one embodiment, the foldable housing 10 may include a front cover (eg, window) 101 that provides (or forms) 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', 'foldable display area', or 'bendable display area'. The screen may refer to (or be defined or interpreted as) 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 of the flexible display 20 area and the area of the front cover 101 overlapped therewith. In some embodiments, the front cover 101 may be integrally provided (or formed) with the flexible display 20 as a component included in the flexible display 20 . When the front cover 101 is defined or interpreted as a component included in the flexible display 20 , the front cover 101 may be excluded from the foldable housing 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. polyurethane)) may be in the form of a coating layer or a protective layer (not shown separately).

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 (or foldable portion, folding area, bendable portion, or bendable area) 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 separately). 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 provides (or 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 of the folding axis (A). a first rear cover 111 to cover at least a portion of the space between the first cover and the first rear cover 111 and to provide (or form) the first side member (or the first side member 10C); 1 side bezel structure) 112 may be included. 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 provided (or formed). The second housing 12 provides (or forms) at least a portion of the second cover portion of the front cover 101 and the fourth cover area ⓓ of the rear surface 10B located on one side of the folding axis A. a second rear cover 121, and a second side member (or side member) that provides (or forms) a second side surface 10D while at least partially enclosing the space between the second cover portion and the second rear cover 121 bezel structure) 122 may be included. 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 provided (or formed). In the fully 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. may be provided (or 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 provided (or formed) by a combination of at least two of them. The first rear cover 111 or the second rear cover 121 may include, for example, at least one coating layer disposed on the plate using a plate and a coating of various materials such as transparent glass, ceramic, or polymer ( not separately shown) may be included. 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 decoration film (not separately shown) may be included. In some embodiments, the first rear cover 111 and the first side member 112 may be integrally provided (or formed) and may include the same material. In some embodiments, the second rear cover 121 and the second side member 122 may be integrally provided (or 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 forms a gap B between the first housing 11 and the second housing 12 As this is opened, 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 formed between the first housing 11 and the second housing 12. It may be covered by 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, providing (or 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. : a foldable housing structure or a 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 (or may be defined or interpreted as a more flexible portion) and may be bent in the 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 another display (hereinafter referred to as a sub-display) 210 located 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 provided (or 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 provided (or formed) adjacent to the long edge of the first rear cover 111 that is 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 They may be positioned substantially symmetrically on opposite sides of each other. 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 provided (or formed) on the first side surface 10C corresponding 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 in an opening (not shown) provided (or formed) in the first side surface 10C, for example. 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 provided (or formed) on the second side surface 10D corresponding 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 includes, for example, a receiver for communication located inside the electronic device 1 and a receiver hole (not shown) provided (or formed) in the fourth cover area ⓓ corresponding to the receiver for communication. can include

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 provided (or formed) in the form of a notch according to the location 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 provided (or 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 a different pixel density (eg, the number of pixels per unit area) than other areas (not shown separately). ). A pixel structure and/or a wiring structure (not separately shown) provided (or formed) in a partial area of the sub-display 210 overlapping at least partially with the first camera module 205 is provided between the outside and the first camera module 205. loss of light can be reduced. 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 may be configured 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, a heart rate HRM (HRM) sensor). monitor) sensor), 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 provided (or 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 provided (or 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 (not separately shown) 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 (not separately shown). 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 provided (or formed) in a partial region of the sub-display 210 overlapping at least partially with the sensor module may cause various types of signals (eg, light or ultrasonic waves) related to the sensor module between the outside and the sensor module. ) can reduce the loss. 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 provided (or 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 some embodiments, the electronic device 1 may include a detachable pen input device (eg, an electronic pen, a digital pen, or a stylus pen) (not separately 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 is a cross-sectional view 300 of the display assembly 30 included in the electronic device 1 taken along the line C-C′ in FIG. 1 according to one embodiment (eg, a cross-sectional view in an x-z plane or a cross-sectional structure). )am. FIG. 4 is a view (eg, x-y plan view) illustrating the first layer 310 included in the front cover 101 in a folded state (see FIG. 1 ) of the electronic device 1 according to an embodiment. FIG. 5 is a cross-sectional view (or cross-sectional structure) 500 of the flexible display 20 included in the display assembly 30 of FIG. 4 according to one embodiment. FIG. 6 is a cross-sectional view 600 of the display assembly 60 included in the electronic device 1 taken along the line C-C′ in FIG. 1 according to various embodiments (eg, a cross-sectional view or cross-sectional structure in an x-z plane). )am.

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. A cross-sectional view 300 shown in FIG. 3 may correspond to a portion of the display assembly 30 corresponding to the folding cover region 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 provide (or 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 Substantially the same may be provided (or formed) in the first cover area ⓐ, the second cover area ⓑ, and the folding cover area F.

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 glass formed of (or made from) 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. It may include a plate (eg, thin glass or ultrathin 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 provides (or forms) the front surface 10A (see FIG. 1) of the electronic device 1 (eg, the third layer 330 and the fourth layer 340) is omitted), the first layer 310 may have superior scratch resistance compared to a plastic film (eg, a 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 (for example, the third surface 303 and A separation distance between the fourth surfaces 304) may be provided (or 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, as shown in FIG. 4 , the first layer 310 has a fourth pattern (or a fourth pattern structure) provided (or formed) corresponding to the folding cover region F of the front cover 101. ) (40). 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 periodically provided (or formed), 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 may be provided (or formed) in a form 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 view 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 refer to (or be defined or interpreted as) a portion provided (or formed) with a depression in the fourth surface 304 , for example. 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 provided (or formed) as a lattice structure including a plurality of openings 401 or a recess pattern including a plurality of recesses 601 is the front cover 101 may be extended to the first cover 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 or computer numerical control (CNC) processing. , 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 to the flexible display 20 may be provided (or formed) by the second layer 320, and the second layer 320 is the first layer. It may include a portion disposed (eg, filled) in the plurality of openings 401 (or the plurality of recesses 601 in the embodiment of FIG. 6 ) of 310 . 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. 320 may be disposed on one surface provided (or formed) by the portion 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 . The second layer 320 is a bent area (or bent) corresponding to the folding cover area F of the front cover 101 among the first layer 310 in the folded state of the electronic device 1 (see FIG. 2 ). The bending stress generated in the double area) can be relieved. 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 breakage by deterioration or loss of elasticity due to fatigue accumulation, the second The layer 320 may alleviate 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 substantially causes breakage or permanent deformation of the display assembly 30 or 60 while allowing the display assembly 30 or 60 to be smoothly deformed in a state transition of the electronic device 1 (eg, a transition between an unfolded state and a folded state) It can be a value that makes it not happen. For example, when the electronic device 1 is converted from a folded state to an unfolded state, the second layer 320 provides elasticity that contributes to restoring the front cover 101 without substantially plastic deformation. can have The second layer 320 may have an elongation of about 4% to about 20%, for example.

The folding cover area F of the front cover 101 has a plurality of openings 401 (or a plurality of recesses in the embodiment of FIG. 6) compared to the first cover area ⓐ and the second cover area ⓑ. 601)), the folding cover area F 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. According to one embodiment, 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, a bonding layer (not shown) including a primer may be present 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 (or light of a specified frequency) are irradiated toward the first layer 310, the UV molding liquid may be cured in response to the transmitted ultraviolet rays passing through the first layer 310, thereby curing the first layer 310. A sheet having a form in which the second layer 320 is attached to 310 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. In the embodiment of FIG. 3 , the third layer 330 is composed of a plurality of the first layer 310 and the second layer 320 by using an optically transparent adhesive member (not shown) such as OCA, OCR, or SVR. The openings 401 may be disposed on one side provided (or formed) by the part located. In the embodiment of FIG. 6 , the third layer 330 may be disposed on the first layer 310 using an optical transparent adhesive member (not shown). 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 the folded state to the 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 provide (or form) the first surface 301 of the front cover 101 . The fourth layer 340 may be disposed on the third layer 330 using an optical transparent adhesive member (not shown) 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 (or made) 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 the folded state to the 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 provide (or 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 provide (or form) the front surface 10A of the electronic device 1, the third layer 330 and the second layer 330 in the embodiment of FIG. The fourth layer 340 may 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.

According to an embodiment, the display panel 21 includes 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 is a film structure (or film) in which at least one TFT is disposed on a flexible substrate (eg, PI film) through a series of processes such as deposition, patterning, and etching. can be 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

According to one embodiment, the display panel 21 may include a storage capacitor, which maintains a voltage signal in a pixel, maintains a voltage input to a pixel within one frame, or reduces leakage current during light emission time. It is possible to reduce the change in the gate voltage of the TFT due to 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.

According to 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 21c may serve as a pixel protection layer for protecting a plurality of pixels of the light emitting layer 21a.

According to one embodiment, the base film 22 may include a flexible film formed (or made) of a polymer or plastic such as polyimide or polyester (PET). The base film 22 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'.

According to one embodiment, 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 embossed 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 .

According to one embodiment, 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.

According to some embodiments, at least a portion of the lower layer 23c is a conductive member (eg, a metal plate), and may help to reinforce the rigidity of the electronic device 1, shield ambient noise, and dissipate ambient heat. It can be used to dissipate heat emitted from a component (eg, a display driving circuit (eg, DDI)). 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

According to various embodiments, the lower layer 23c may include various layers for various other functions.

According to various 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 .

According to 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) is omitted. It could 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.

According to one embodiment, the optical layer 24 may include 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 combining a polarization layer and a retardation layer may be provided, and such a layer may be defined or interpreted 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.

According to an 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).

According to one embodiment, the touch sensing circuit may be disposed between the front cover 101 and the optical layer 24 (eg, an add-on type).

According to one embodiment, the touch sensing circuit may be disposed between the optical layer 24 and the display panel 21 (eg, on-cell type).

According to an embodiment, the display panel 21 may include a touch sensing circuit or a touch sensing function (eg, an in-cell type).

According to one embodiment, the flexible display 20 is a metal mesh as a touch sensing circuit disposed on the encapsulation layer 21c between the encapsulation layer 21c and the optical layer 24 (eg, aluminum metal mesh) It may include a conductive pattern (not shown) such as. 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.

According to various embodiments, the flexible display 20 may further include a pressure sensor (not shown) capable of measuring the intensity (pressure) of a touch.

According to various embodiments, the 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.

According to various embodiments, an electromagnetic induction panel (eg, a digitizer) 501 may be positioned between the buffer layer 23b and the lower layer 23c.

According to various embodiments, the electromagnetic induction panel 501 may be positioned between the composite sheet 23d and the conductive sheet 23e of the lower layer 23c.

According to various embodiments, the electromagnetic induction panel 501 may be positioned between the light blocking layer 23a and the buffer layer 23b.

According to various embodiments, the electromagnetic induction panel 501 may be implemented in the form of a flexible film or a flexible sheet. The electromagnetic induction panel 501 may be provided (or formed) as, for example, a flexible printed circuit board.

According to an embodiment, 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).

According to one embodiment, 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 .

According to various 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 switching between an unfolded state (see FIG. 1 ) and a folded state (see FIG. 2 ) of the electronic device 1, and the flexible display 20 impact can be reduced.

According to one embodiment, the support sheet 502 can be formed (or made) 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 (not separately shown) provided (or 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 provided (or 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.

According to various embodiments, the support sheet 502 may include a recess pattern (not shown) including a plurality of recesses by replacing the lattice structure.

According to various embodiments, the lattice structure or the recess pattern contributing to the flexibility of the flexible display 20 may further extend to other parts.

According to various embodiments, the support sheet 502 including a lattice structure or a recess pattern or a conductive member corresponding thereto may be provided (or formed) in a plurality of layers.

According to various 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 (or be defined or interpreted as) an interval in which openings or recesses of a substantially constant shape are periodically and repeatedly arranged. Referring to the embodiment of FIG. 3 in which the display assembly 30 is in an unfolded state, the plurality of openings 401 are formed in a direction substantially perpendicular to the folding axis A with respect to the fourth pitch P4 (eg, : x-axis direction). Referring to the embodiment of FIG. 6 in which the display assembly 30 is in an unfolded state, the plurality of recesses 601 are formed in a direction substantially perpendicular to the folding axis A based on the fourth pitch P4 ( eg in the 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 provided (or formed) in various ways to secure the flexibility of the first layer 310 .

According to an embodiment, the fourth pattern 40 of the first layer 310 is provided to reduce a moire phenomenon when light is output from a plurality of sub-pixels included in the display panel 21 ( or formed). 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. (eg, moiré pattern) may be 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). ) It is possible to provide (or form) a first pattern arranged at a first pitch (or first spacing) in substantially the same direction as the direction in which the pattern is 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). ) It is possible to provide (or form) a second pattern arranged at a second pitch (or second spacing) in substantially the same direction as the direction in which the pattern is 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 provide (or 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 one embodiment, a fourth spatial frequency vector provided (or formed) due to the fourth pitch P4 of the fourth pattern 40 included in the first layer 310 based on a Fourier transform, and A spatial frequency vector provided (or formed) through a convolution summation of a first spatial frequency vector provided (or formed) due to a first pitch of a first pattern with respect to a plurality of first sub-pixels is visually recognized by a human. It can be located within a visibility circle about 60 cycles/degree corresponding to the limit pitch that can be made, and the moiré phenomenon may not substantially occur. In an embodiment, a fourth spatial frequency vector provided (or formed) due to the fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and a plurality of second spatial frequency vectors based on a Fourier transform. The spatial frequency vector provided (or formed) through the convolutional sum of the second spatial frequency vector provided (or formed) due to the second pitch of the second pattern for the sub-pixels corresponds to the human-visible threshold pitch. It may be located within a visibility circle of about 60 cycles/degree, and the moiré phenomenon may not substantially occur. In an embodiment, a fourth spatial frequency vector provided (or formed) due to the fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and a plurality of third spatial frequency vectors based on a Fourier transform. The spatial frequency vector provided (or formed) through the convolutional sum of the third spatial frequency vector provided (or formed) due to the third pitch of the third pattern for the sub-pixels corresponds to the human-visible threshold pitch. It may be located within a visibility circle of about 60 cycles/degree, and the moiré phenomenon may not substantially occur.

FIG. 7 is a cross-sectional view 700 of a display assembly 70 included in the electronic device 1 taken along line C-C′ in FIG. 1 according to various embodiments (eg, a cross-sectional view or cross-sectional structure in an x-z plane). )am.

Referring to the cross-sectional view of FIG. 7 , compared to the cross-sectional view 300 of FIG. 3 , the second layer 320 includes portions disposed in (eg, filled in) the plurality of openings 401 of the first layer 310. may not The display assembly 30 may include a material disposed (eg, filled) in the plurality of openings 401 of the first layer 310 . A material disposed (eg, filled) in the plurality of openings 401 may be substantially transparent. A material (eg, a flexible polymer material) that does not degrade the flexibility of the first layer 310 may be disposed (eg, filled) in the plurality of openings 401 . A material disposed (eg, filled) in 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 disposed (eg, filled) in the plurality of openings 401 . The material disposed (eg, filled) in the plurality of openings 401 is the folded cover area of the front cover 101 of the first layer 310 in the folded state (see FIG. 2) of the electronic device 1 ( Corresponding to F), it is possible to alleviate the bending stress generated in the bent bending area. 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 breakage by deterioration or loss of elasticity due to fatigue accumulation, a plurality of A material disposed (eg, filled) in the openings 401 may relieve bending stress occurring in the first layer 310 .

According to an embodiment, the material disposed (eg, 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, the second layer ( 320) and/or a material capable of reducing loss of light by reducing the difference in refractive index with the third layer 330.

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

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

FIG. 8 is a cross-sectional view 800 (eg, a cross-sectional view or cross-sectional structure in an x-z plane) of the display assembly 30 in which the second layer 320 is modified in the embodiment of FIG. 7 according to various embodiments.

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 provided (or formed) in the first layer 310 and a plurality of first openings provided (or formed) in the second layer 320 to be aligned with the first openings. 2 openings 801 may be included. When the display assembly 30 is viewed from the top of the first side 301 in an unfolded state, 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 disposed (eg, filled) in the plurality of openings 401 . A material disposed (eg, filled) in the plurality of openings 401 may be substantially transparent. A material (eg, a flexible polymer material) that does not deteriorate the flexibility of the first layer 310 or the display assembly 30 may be disposed (eg, filled) in the plurality of openings 401 . A material disposed (eg, filled) in 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 disposed (eg, filled) in the plurality of openings 401 . The material disposed (eg, filled) in the plurality of openings 401 is the folded cover area of the front cover 101 of the first layer 310 in the folded state (see FIG. 2) of the electronic device 1 ( Corresponding to F), it is possible to alleviate the bending stress generated in the bent bending area. 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 breakage by deterioration or loss of elasticity due to fatigue accumulation, a plurality of A material disposed (eg, filled) in the openings 401 may relieve bending stress occurring in the first layer 310 .

According to an embodiment, the material disposed (eg, 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, the second layer ( 320), the difference in refractive index with the third layer 330, and the difference in refractive index with the fifth layer 350 may be reduced to reduce loss of light.

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

9 shows a grid structure included in the front cover 101 and a plurality of subpixels 900 included in the flexible display 20 in an unfolded state of the electronic device 1 according to an embodiment. It is a drawing (e.g., x-y plan view) showing the positional relationship between FIG. 10 is an enlarged view of a portion indicated by reference numeral 901' in FIG. 9 according to an embodiment.

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). 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) ( It is possible to provide (or form) a first pattern arranged in P1). 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 ) It is possible to provide (or form) a second pattern arranged at a second pitch (or second spacing) (P2) in substantially the same direction as the direction in which the pattern is arranged. In the blue sub-pixel B, 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). It is possible to provide (or form) a third pattern arranged at a third pitch (or third spacing) (P3) in substantially the same direction as the direction in which the pattern is arranged in ). 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 provided (or formed) due to the fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and a plurality of sub A spatial frequency vector provided (or formed) through a convolutional sum of first spatial frequency vectors provided (or formed) due to the first pitch P1 of the first pattern for the red sub-pixel R of the pixels 900 may be located within a visibility circle of about 60 cycles/degree corresponding to a limit pitch that a person can see, and a 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 provided (or formed) due to the fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and a plurality of sub A spatial frequency vector provided (or formed) through a convolutional sum of second spatial frequency vectors provided (or formed) due to the second pitch P2 of the second pattern for the green sub-pixel G of the pixels 900 . may be located within a visibility circle of about 60 cycles/degree corresponding to a limit pitch that a person can see, and a 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 provided (or formed) due to the fourth pitch P4 of the fourth pattern 40 included in the first layer 310 and a plurality of sub A spatial frequency vector provided (or formed) through a convolutional sum of a third spatial frequency vector provided (or formed) due to the third pitch P3 of the third pattern for the blue sub-pixel B of the pixels 900. may be located within a visibility circle of about 60 cycles/degree corresponding to a limit pitch that a person can see, and a 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 . An edge shape of the recesses 601 may be indicated (or defined or interpreted as an edge shape). 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 provided (or formed) as a thin film having a thickness of, for example, about 30 μm to about 1000 μm, and a surface included in the plurality of openings 401 includes a plurality of openings ( 401) can be interpreted as having an insignificant height compared to the width. 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 direction of the blue sub-pixels includes a first arrangement direction (①), a second arrangement direction (②), a third arrangement direction (③), and/or a 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 provided (or 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 provide (or 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 edge E of the fourth pattern 40 is provided not parallel to the first array direction ①, the second array direction ②, the third array direction ③, and the fourth array direction ④ ( or formed). 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 provided 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 (or formed) comparative examples, it may be difficult to reduce the moire phenomenon due to mismatching of wavelengths and/or differences in refractive index.

11 is a diagram (eg, an x-y plan view) illustrating a first layer 310 including a fourth pattern, according to various embodiments.

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 provide (or 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 provide (or 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 provided (or formed) substantially non-parallel.

12 is a diagram (eg, an x-y plan view) illustrating a first layer 310 including a fourth pattern, according to various embodiments.

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 a tenth patch P10. The fourth pattern of the first layer 310 includes a fifth sub-pattern in which a plurality of second openings 1202 of a second shape are arranged in an eleventh patch P11 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 provide (or form) a pattern arranged at a pitch smaller than the seventh pitch P7 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 , 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 provide (or 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 provide (or form) a pattern arranged at a pitch smaller than the ninth pitch P9 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 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 provide (or form) a pattern arranged at a pitch smaller than the tenth pitch P10 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 , 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 provide (or form) a pattern arranged at a pitch smaller than the 11th pitch P11 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 sixth subpattern of the first layer 310 are arranged in the twelfth pitch P12. It may be arranged to provide (or 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)) may be provided (or formed) not substantially parallel to each other.

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.

Referring to FIGS. 3, 6, 7, or 8, a load may be applied or transmitted to the front cover 101 (eg, a window or a front plate) from the outside for various reasons. For example, when a user input is performed by contacting the pen tip of the pen input device to the first surface 101 of the front cover 101, a load (or pressurized load) due to pressurization of the pen input device is applied to the front cover ( 101) may be applied or transmitted. For another example, when an object such as a pen input device is dropped and collides with the front cover 101, a load (eg, an impact load) may be applied to or transmitted to the front cover 101. A load may be applied or transferred to the front cover 101 for various other reasons. The first layer 310 included in the front cover 101 may have a substantial effect on the strength or durability of the front cover 101 . When a load from the outside is applied to the first surface 301 of the front cover 101, the load from the outside indirectly affects the first layer 310 through the third layer 330 and the fourth layer 340. can be forwarded to When the third layer 330 and the fourth layer 340 are omitted, an external load may be directly applied to the first layer 310 . In one embodiment, the first layer 310 or the front cover 101 may be implemented to reduce or prevent damage to external loads.

According to one embodiment, the first layer 310 (see FIG. 3) or the front cover 101 (see FIG. 3) switches between an unfolded state and a folded state of the electronic device 1 (see FIG. 1). It can be implemented so that it can be bent while reducing bending stress without breakage. The first layer 310 or the front cover 101 may be implemented to be restored to a substantially flat state when the electronic device 1 is converted from a folded state to an unfolded state.

According to an embodiment, the first layer 310 (see FIG. 3 ) may include thin glass (or ultra thin glass), and the thin glass may be implemented to reduce breakage with respect to stress from the outside. .

According to an embodiment, the thin glass (eg, first layer 310) may be implemented to secure or improve strength (eg, fracture stress). The strength of the thin glass may be secured or improved through reinforcement so as to reduce or prevent the thin glass from being damaged against an external load. Since the compressive stress (or compressive force) of the surface of the thin glass (eg, the third surface 303 or the fourth surface 304 in FIG. 3) can be increased through strengthening, the thin glass is resistant to damage from the outside. It may have strength (e.g., surface strength) capable of reducing or preventing breakage under stress. The thin film glass is a surface (eg, the third face 303 or the fourth face 304 in FIG. 3 ) secured or improved in mechanical strength (eg, impact resistance and abrasion resistance) through reinforcement, or a compression to provide this surface. It may have a stress layer or a compressive stress surface.

According to an embodiment, strengthening of the thin glass (eg, the first layer 310) may include thermal strengthening or chemical strengthening. Thermal strengthening may be to improve mechanical strength through thermal stress generated by heat-treating thin glass (eg, applying high heat). Chemical strengthening may be to improve mechanical strength by injecting a material for mechanical strength into thin glass.

According to one embodiment, the compressive stress layer provided through reinforcement of the thin glass (eg, the first layer 310) or the inside (or internal region) of the thin glass in contact with the compressive stress surface has toughness (eg, fracture by external force). It can have a tough and strong impact resistant property) that is difficult to become. Fatigue life of the thin film glass is secured or improved against a load from the outside and/or a bending stress generated in the transition between the unfolded state and the folded state of the electronic device 1 (see FIG. 1) It can be.

According to an embodiment, the thin glass (eg, the first layer 310) may be implemented to reduce surface defects. Thin glass can reduce surface defects through surface treatment. Surface treatment may include, for example, etching or polishing. Through the surface treatment, the surface of the thin glass can have uniformity and can provide the original smooth feel of the glass.

According to an embodiment, the strength (eg, breaking strength) of the first layer 310 (eg, thin glass) or the front cover 101 may be confirmed through the first evaluation, the second evaluation, or the third evaluation. there is.

According to one embodiment, the first evaluation is performed on the pen input device (or object corresponding to the pen input device) disposed on a surface plate, the first layer 310, or the stack including the first layer 310. It may be to check the drop height of the pen input device that caused damage to the first layer 310 or the laminate by dropping it through a sieve. The first evaluation may be a user experience using a pen input device.

According to one embodiment, the second evaluation is performed by pressing the first layer 310 or the stack including the first layer 310 disposed on the surface plate with a pen input device (or an object corresponding to the pen input device). , it is possible to check the load (or applied load) that caused damage to the first layer 310 or the laminate. The second evaluation may be based on user experience using the pen input device.

According to one embodiment, the third evaluation may be an evaluation of penetration resistance according to an American society for testing method (ASTM) standard (eg, ASTM F1306-16).

13 is a perspective view 1301 of a test device 1300 for a first evaluation, a second evaluation, and a third evaluation, and a diagram 1302 illustrating the test device 1300, according to one embodiment.

Referring to FIG. 13 , in one embodiment, a test device 1300 may include a clamping device (eg, manual clamping fixture) 1310 and a probe (eg, penetration probe) 1320. Flexible materials (eg, flexible films and/or laminates) (eg, the first layer 310 in FIG. 3 or a laminate including the first layer 310) may be placed in the clamping device 1310. . The probe 1320 may be implemented to be linearly movable with respect to the clamping device 1310 . The probe 1320 may be moved linearly to apply a load to a flexible material disposed in the clamping device 1310 . When the probe 1320 breaks the flexible material, the load (eg, breaking load) may be detected through a detector (eg, sensor) connected to the probe 1320 .

According to one embodiment, the clamping device 1310 may include a first plate 1311 , a second plate 1312 , and a plurality of supporters 1313 .

According to one embodiment, the first plate 1311 may be a surface plate. A flexible material to be tested (eg, the first layer 310 of FIG. 3 or a laminate including the first layer 310 ) may be disposed on the first plate 1311 . The first plate 1311 may include a support surface 1311a on which a flexible material to be tested is disposed. The support surface 1311a of the first plate 1311 may be substantially flat. The first plate 1311 may include an opening 1311b corresponding to the probe 1320 . The opening 1311b may reduce or prevent an influence of the first plate 1311 on the strength detection of the flexible material. The opening 1311b may prevent the first plate 1311 from interfering with the linear movement of the probe 1320 .

According to one embodiment, the second plate 1312 allows the probe 1320 to press against a flexible material (eg, the first layer 310 of FIG. 3 or a laminate including the first layer 310). It may be spaced apart from the first plate 1311 in a linearly moving direction. The space between the first plate 1311 and the second plate 1312 may prevent the clamping device 1310 from interfering with the linear movement of the probe 1320 . The plurality of supporters 1313 may be disposed between the first plate 1311 and the second plate 1312 . The plurality of supporters 1313 may connect the first plate 1311 and the second plate 1312 . The second plate 1312 may be coupled to a body (not separately shown) included in the test device 1300, and the first plate 1311 is supported by a plurality of supporters 1313 so that the body It can be spaced apart from the second plate 1312 coupled with. The body of the test device 1300 is a substantial support that stably supports components such as the probe 1320 and the second plate 1312, and can reduce vibration or shaking during operation of the test device 1300.

According to an embodiment, the first layer 310 of FIG. 3 or a laminate including the first layer 310 may be disposed on the support surface 1311a of the first plate 1311 . For example, the fourth side 304 (see FIG. 3) of the first layer 310 can face the support surface 1311a, and the third side 303 (see FIG. 3) of the first layer 310 ) may be substantially directed in the direction in which the substantially planar support surface 1311a faces.

According to an embodiment, the probe 1320 may include a pen input device (eg, an electronic pen, a digital pen, or a stylus pen). The pen input device may be placed on the test device 1300 while standing in a direction substantially perpendicular to the support surface 1311a of the first plate 1311 . When the test device 1300 is driven, the pen tip 1321 of the pen input device may press the first layer 310 (eg, thin glass) (see FIG. 3 ) disposed on the first plate 1311 . When the pen input device standing vertically in the test device 1300 is moved and a load is applied to the first layer 310 (see FIG. 3 ), the user misses the pen input device and drops it, or the user uses the pen input device. It can be understood that it is at least similar to a situation in which a touch input is performed by performing a touch input.

According to one embodiment, the pen input device may have a weight of about 5.6 g.

According to one embodiment, the diameter D1 of the pen tip 1321 included in the pen input device may be substantially about 0.3 mm.

According to one embodiment, the pen tip 1321 of the pen input device may be a ball tip made of tungsten carbide. The ball tip may have a convex curved end.

According to various embodiments, the probe 1320 may be provided as an object that can substantially replace a pen input device.

According to one embodiment, the test device 1300 may follow the ASTM F1306-16 standard for evaluating puncture resistance of a flexible material in relation to the third evaluation. The probe 1320 may be provided in accordance with the ASTM F1306-16 standard. According to the ASTM F1306-16 standard, the support surface 1311a of the first plate 1311 may have a surface roughness of about 200 μm. According to the ASTM F1306-16 standard, the diameter D2 of the opening 1311b of the first plate 1311 may be substantially about 35 mm. According to the ASTM F1306-16 standard, the distance H between the first plate 1311 and the second plate 1312 in the linear movement direction of the probe 1320 may be substantially about 76 mm.

According to one embodiment, the first evaluation and the second evaluation may be substantially performed through the test device 1300 according to the ASTM F1306-16 standard.

FIG. 14 shows the first layer 310 to substantially prevent damage to the first layer 310 (eg, thin glass) (see FIG. 3 ) according to the drop height of the pen input device according to an embodiment. It is a graph showing the minimum surface compressive stress to have.

According to one embodiment, the surface compressive stress of the first layer 310 may be the compressive stress of the third surface 303 (see FIG. 3) or the fourth surface 304 (see FIG. 3).

Referring to FIG. 14 , in one embodiment, the first layer 310 may have a thickness of about 0.14 mm or less than about 0.14 mm. In order to reduce or prevent the first layer 310 from being damaged when a dropped pen input device applies an impact to the first layer 310, the first layer 310 has a surface compressive stress of about 100 MPa or more than 100 MPa. It can be implemented to have

FIG. 15 is a first evaluation of a laminate including the first layer 310 of FIG. 3 according to an embodiment, and the damage of the first layer 310 is determined according to the thickness of the first layer 310. It is a graph showing the drop height of the pen input device that generates the pen input device.

According to an embodiment, a laminate including the first layer 310 (eg, thin glass) of FIG. 3 includes the first layer 310, a flexible display (eg, the flexible display 20 of FIG. 3), and An adhesive material (eg, the transparent optical adhesive member 350 of FIG. 3 ) may be included between the first layer 310 and the flexible display.

Referring to FIG. 15, as the thickness of the first layer 310 (eg, thin glass) (see FIG. 3) included in the laminate is thicker, the height of the pen input device that causes breakage of the first layer 310 increases. can be big In one embodiment, the thickness of the first layer 310 is limited to a value that allows the electronic device 1 (see FIG. 1 ) to bend while reducing bending stress without breakage when switching from an unfolded state to a folded state. can In one embodiment, the thickness of the first layer 310 may be limited to a value capable of reducing the radius of curvature or curvature as much as possible without breaking (or reducing bending stress) during bending.

16 is a diagram 1601 showing a test device 1300 and a first layer 310 (eg, thin glass) with respect to a first evaluation, and a test device with reference to a second evaluation, according to one embodiment. 1300 and 1602 showing the first layer 310 .

Referring to FIG. 16 , in the first evaluation through the test device 1300, the first protective film 1611 of polymer is applied to the first layer 310 through the first adhesive material (or first adhesive material) 1612. (eg, thin film glass) may be disposed (eg, attached) to the third surface 303 . In the first evaluation through the test device 1300, the second protective film 1621 of polymer is passed through the second adhesive material (or second adhesive material) 1622 to the fourth side 304 of the first layer 310. ) can be placed (e.g. attached). The first protective film 1611 and the second protective film 1621 may be, for example, poly ethylene terephthalate (PET) having a thickness of about 50 μm. The first adhesive material 1612 and the second adhesive material 1622 may be, for example, pressure sensitive adhesive (PSA) having a thickness of about 25 μm or less than about 25 μm.

According to an embodiment, in the second evaluation through the test device 1300, the protective film 1631 of polymer is passed through the adhesive material (or adhesive material) 1632 to the first layer 310 (eg, thin glass). It may be disposed (eg, attached) to the fourth side 304 of the . The protective film 1631 may be, for example, PET having a thickness of about 200 μm. The adhesive material 1632 may be, for example, PSA having a thickness of about 10 μm or less than 10 μm. In one embodiment, in the second evaluation through the test device 1300, a protective film (eg, a urethane jig) of Hs30 hardness (not shown) covers the fourth surface 304 of the first layer 310 can be located

FIG. 17 shows the first layer 310 (eg, thin glass) according to the thickness of the first layer 310 (eg, thin glass) (see FIG. 3) as a result of the first evaluation through the test device 1300 (see FIG. 13) according to an embodiment. A graph 1701 showing the drop height of the pen input device (eg, the probe 1320 of FIG. 16 ) causing breakage of one layer 310, and the first as a result of the second evaluation through the test device 1300 It is a graph 1702 showing the applied load through the pen input device that causes breakage of the first layer 310 according to the thickness of the layer 310 . 18 is a result of a third evaluation (eg, evaluation of puncture resistance according to the ASTM F1306-16 standard) through the test device 1300 (see FIG. 13) according to an embodiment, the first layer 310 ( Example: It is a graph showing the breaking load according to the thickness of thin glass) (see FIG. 3).

According to an embodiment, in consideration of the first evaluation result disclosed in FIG. 17 , the drop height of the pen input device capable of damaging the first layer 310 (eg, thin glass) (see FIG. 3 ) is about 6 cm. , or the first layer 310 may be implemented to be 6 cm or more.

According to an embodiment, in consideration of the second evaluation result disclosed in FIG. 17, the applied load through the pen input device capable of damaging the first layer 310 may be about 0.3 kgf or more than 0.3 kgf. A first layer 310 may be implemented.

According to one embodiment, considering the third evaluation result disclosed in FIG. 18, the first layer 310 is implemented so that the puncture resistance (eg, breaking load or strength of judgment) can be about 3 kgf or 3 kgf or more. can

According to an exemplary embodiment of the present document, an electronic device (eg, electronic device 1 in FIG. 1 ) includes a front surface (eg, front surface 10A in FIG. 1 ) and a rear surface (eg, electronic device 1 in FIG. 1 ) of the electronic device. It may include a foldable housing (eg, the foldable housing 10 of FIG. 1 ) providing (or forming) a rear surface 10B of the . 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 FIG. 3 or 6 ) providing (or forming) the front surface of the electronic device in the foldable housing, and can be seen through the front cover. The front cover is provided (or formed) with a plurality of openings corresponding to the foldable portion of the foldable housing (eg, a plurality of openings 401 in FIGS. 3, 7, or 8) or a surface facing the flexible display. ) A plurality of recesses (eg, the plurality of recesses 601 of FIG. 6 ) may include a pattern (eg, the pattern 40 of FIG. 4 or 10 ) provided (or formed) periodically. there is. 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). Among the flexible displays, 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 greater 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 exemplary embodiments of this document, a second interval (e.g., the first pitch P1, the second pitch P2, or the third pitch P3 of FIG. 10 versus the first interval (e.g., FIG. 3, The ratio of the fourth pitch (P4) of 6, 7, or 8 may be 0.01:1 to 0.8:1.

According to an exemplary embodiment of the present document, a plurality of openings (eg, plurality of openings 401 of FIGS. 3, 7, or 8) or a plurality of recesses (eg, in at least one direction parallel to the flexible display) Example: The shape of the edge (eg, the edge E of FIG. 10) of the plurality of recesses 601 in FIG. 6 is one in which a plurality of sub-pixels emitting light of the same wavelength are periodically arranged in a flexible display. It may be provided (or formed) non-parallel to the above directions.

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

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

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

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

According to an exemplary 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 exemplary embodiment of the present document, the first layer (eg, the first layer 310 of FIGS. 3, 6, 7, or 8) has a breaking strength of 3 kgf or 3 kgf or more based on the ASTM F1306-16 standard. can have

According to an exemplary embodiment of the present document, the first layer (eg, the first layer 310 of FIGS. 3, 6, 7, or 8) may have a surface compressive stress of 100 MPa or more than 100 MPa.

According to an exemplary embodiment of the present document, the electronic device may further include a pen input device. The pen input device may have a weight of 5.6 grams. A pen tip of the pen input device may have a diameter of 0.3 mm. When the pen input device is dropped vertically by directing the pen tip toward the first layer (eg, the first layer 310 of FIGS. 3, 6, 7, or 8), the first layer has a falling height of 6 cm, Alternatively, it may have a strength that does not break when it is 6 cm or more.

According to the exemplary embodiments of the present document, the electronic device may further include a pen input device. The pen input device may have a weight of 5.6 grams. A pen tip of the pen input device may have a diameter of 0.3 mm. When registering the first layer (eg, the first layer 310 of FIGS. 3, 6, 7, or 8) as a pen input device through the pen tip, the first layer is 0.3kgf or 0.3kgf or more for a pressure load. It can have unbreakable strength.

According to an exemplary embodiment of this document, the first layer (eg, the first layer 310 of FIGS. 3, 6, 7, or 8) can be bent without breaking to a radius of curvature greater than 5 mm, or greater than 0 mm and less than 5 mm. can

According to an exemplary embodiment of the present document, the front cover (eg, front cover 101 of FIG. 3 or 6 ) may include a second layer (eg, 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 is disposed in a plurality of openings (eg, plurality of openings 401 in FIG. 3 ) or a plurality of recesses (eg, plurality of recesses 601 in FIG. 6 ). may include filled (eg filled) parts.

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

According to an exemplary embodiment of the present document, an electronic device may include a second layer (eg, second layer 320 of FIG. 3, 6, 7, or 8) and a flexible display (eg, FIG. 3, 6, 7, or 8). 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 may be further included.

According to an exemplary embodiment of the present document, the foldable housing (eg, the foldable housing 10 of FIG. 1 ) is the front surface (eg, the foldable housing 10 of FIG. 1 ) of the electronic device based on the folding axis (eg, the folding axis (A) of FIG. 1 ). : It may be possible to fold the front surface 10A of FIG. 1) inside.

According to an exemplary embodiment of the present document, the foldable housing (eg, the foldable housing 10 of FIG. 1 ) is the front surface (eg, the foldable housing 10 of FIG. 1 ) of the electronic device based on the folding axis (eg, the folding axis (A) of FIG. 1 ). : The front face 10A of FIG. 1) may be foldable outward.

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.

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 (19)

In electronic devices,
a foldable housing providing 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, coupled to a front cover providing 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 provided on a surface facing the flexible display are periodically provided,
A plurality of subpixels outputting 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, and
The first interval at which the plurality of openings or the plurality of recesses are periodically arranged is greater than the second interval at 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 electronic device of claim 1 , wherein the first layer has a breaking strength of 3 kgf or 3 kgf or more based on the ASTM F1306-16 standard. According to claim 9,
The electronic device of claim 1 , wherein the first layer has a surface compressive stress of 100 MPa or greater than 100 MPa. According to claim 9,
Further comprising a pen input device, wherein the pen input device weighs 5.6 g, and a pen tip of the pen input device has a diameter of 0.3 mm;
The electronic device of claim 1 , wherein when the pen input device is vertically dropped by directing the pen tip toward the first layer, the first layer has strength not to be damaged when the drop height of the pen input device is 6 cm or greater than 6 cm. According to claim 9,
Further comprising a pen input device, wherein the pen input device weighs 5.6 g, and a pen tip of the pen input device has a diameter of 0.3 mm;
The electronic device of claim 1 , wherein when the first layer is pressed with the pen input device through the pen tip, the first layer has strength not to be damaged against a pressing load of 0.3 kgf or 0.3 kgf or more. 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 disposed in the plurality of openings or the plurality of recesses. According to claim 15,
The electronic device further comprises an optically transparent adhesive member positioned between the second layer and the flexible display. 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 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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