Patent Description:
Flexible displays provide the user with the benefits of both large display and portability. A large display improves the user experience, but also increases one of the dimensions of the electronic device. This makes it difficult for the user to carry in their pocket or purse. However, a flexible display allows the user to enjoy the large screen when using the device, while reducing the size of the screen when carrying the electronic device.

If a display device is rollable, it may provide an electronic device with a large display that is portable. The portability would be secured through reduction of the display by allowing a portion of the display to be drawn into the housing of the electronic device. In addition, an electronic device including a rollable display would provide convenience by providing a user with a wide screen when the display is drawn out from the housing.

<CIT>, <CIT> and <CIT> disclose rollable display devices. In particular, <CIT> discloses a rollable display panel comprising: a flexible cover plate including a first ultra-thin glass layer, a flexible array substrate, a first adhesive layer stacked between the cover plate and the array.

substrate, and an edge Curl zone, strain accumulation zone, and flat zone distributed in sequence in the curl direction; a thickness of the portion of the first adhesive layer located in the strain accumulation zone is greater than the thickness of a portion in the curling zone and the flat zone.

However, in order for the display to be rollable, the display would need to be quite thin. This can be a problem for an electronic device including a a pen function. In order to use the pen function of an electronic device including the display, a sufficient thickness of the display may be required.

However, an electronic device having an increased display thickness may have limitations in designing a flexible display. For example, due to an increase in the thickness of the display, it may be difficult for a portion of the display to be inserted into the housing of the electronic device.

In addition, when the thickness of the display is reduced in order to implement the flexible display drawn into the housing, the durability of the display may be reduced.

In addition, an electronic device having a display having low strength may have limitations in functions that can be provided. For example, the electronic device may limit use of a pen function.

In order to overcome this limitation, the electronic device may include a display implementing a differential thickness structure that can be inserted into the housing while providing a sufficient thickness.

Using differential thickness can cause a visibility problem. That is, as the thickness varies, a problem of visibility may occur at a boundary surface of the display. For example, when the electronic device includes a display having different thicknesses, as the difference in thickness between increases, wrinkles may occur at the boundary of the thickness differential due to the difference in the amount of expansion of the displays.

Wrinkles generated on a display may be detrimental to visibility of a screen output by the display and may impair the appearance of the electronic device.

According to certain embodiments, a rollable display device comprises: a housing; a roller disposed inside the housing; and a flexible display configured to be at least partially wound on the roller, the flexible display including a pixel layer and a window, wherein the window includes: a first region having a substantially constant thickness, a second region extending from one end of the first region having a thickness that gradually decreases with a first inclination, in a direction away from the one end of the first region , and a third region extending from one end of the second region having a thickness that gradually decreases with a second inclination different from the first inclination, in a direction away from the second region, and wherein at least a portion of the second region and the third region are configured to be drawn into interior of the rollable display device when the flexible display is wound around the roller.

According to certain embodiments, a rollable display device comprises: a housing; a roller disposed inside the housing; and a flexible display configured to at least partially wind around the roller and including a window, wherein the window includes: a first window portion including a first region, wherein the first region is always exposed to exterior, and a second window portion formed of a material different from that of the first window portion, wherein the second window portion includes: a second region facing one surface of the first region and having a thickness that gradually decreases, with a first inclination, in a direction away from the one surface of the first region, and a third region extending from one end of the second region having a thickness that gradually decreases, with a second inclination different from the first inclination, in a direction away from the one end of the second region, and wherein at least part of the second window portion is configured to be drawn into the rollable display device as the flexible display is wound around the roller.

The flexible display and the electronic device including the flexible display according to certain embodiments disclosed herein are capable of preventing the occurrence of wrinkles due to a sharp difference in the expansion rate, while having a variable thickness on the rolling portion.

In addition, according to certain embodiments, it is possible to provide a flexible display and electronic device having sufficient strength for a pen function in at least a partial region while ensuring visibility.

In addition, various effects directly or indirectly identified through the disclosure may be provided.

In connection with the description of the drawings, the same or similar components may be denoted by the same or similar reference numerals.

Hereinafter, certain embodiments of the disclosure will be described with reference to the accompanying drawings. However, it shall be understood that it is not intended to limit the disclosure to specific embodiments, and that the disclosure includes various modifications, and/or alternatives without departing from the scope of the appended claims.

The flexible display and the electronic device including the flexible display according to certain embodiments disclosed herein are capable of preventing the occurrence of wrinkles due to a sharp difference in the expansion rate, while having a variable thickness on the rolling portion.

<FIG> describes an electronic device with a flexible display. In the first state, the display size is minimized and only first part <NUM> of the display <NUM> is visible. In the second state, the display size is maximized and the second part <NUM> of the display <NUM> is visible, as well as the first part <NUM>. The display is maximized by moving member <NUM> away from member <NUM>. When moving member <NUM> away from member <NUM>, a second part <NUM> of the display <NUM> becomes visible.

<FIG> illustrates front perspective views that show a first state (e.g., a contracted state) or a second state (e.g., an expanded state) of an electronic device according to an embodiment.

The front surface can be the surface the +z direction in which at least a portion (e.g., a first portion <NUM>) of the flexible display <NUM> faces. The rear surface of the electronic device <NUM> can be the surface facing substantially the opposite direction from the front surface, e.g., the -z direction. In addition, the surface surrounding the space between the front surface and the rear surface may be defined as the side surface of the electronic device <NUM>.

At least a portion of the flexible display <NUM> may be disposed on the front surface of the electronic device <NUM>. The flexible display <NUM> may include at least a portion having a flat shape and at least a portion that is curved. A housing <NUM> may surrounding at least a portion of the edge of the flexible display <NUM>.

The housing <NUM> may form a partial region of the front surface, the rear surface, and the side surface of the electronic device <NUM>. According to another embodiment, the housing <NUM> may form a partial region of the side surface and the rear surface of the electronic device <NUM>. The housing <NUM> may include a first housing <NUM> movably connected to a second housing <NUM>.

The first housing <NUM> of the electronic device includes a first side surface portion <NUM> surrounding the flexible display <NUM> and a second side surface portion <NUM> perpendicular to the first side surface portion.

The housing <NUM> may include a first housing <NUM> and a second housing <NUM> coupled to the first housing <NUM> to be movable relative to the first housing <NUM> within a predetermined range.

The flexible display <NUM> may include a first portion <NUM> that is coupled to the second housing <NUM> and a second portion <NUM> that extends from the first portion <NUM> and is capable of being drawn into the interior of the electronic device <NUM> or brought about on the surface of the electronic device <NUM>. For example, the first portion <NUM> may always be exposed to the exterior of the electronic device <NUM>. For example, when the second part <NUM> is drawn into the interior of the electronic device <NUM> (e.g., the first state 100a), the second portion <NUM> may not be exposed to the exterior of the electronic device <NUM>.

The electronic device <NUM> may have a first state 100a and a second state 100b. For example, the first state 100a and the second state 100b of the electronic device <NUM> may be determined depending on a moving distance of the second housing <NUM> relative to the first housing <NUM>, and the state of the electronic device <NUM> may be changed between the first state 100a and the second state 100b by a user's manipulation or mechanical operation.

The first state 100a of the electronic device <NUM> may mean a state before the housing <NUM> is expanded. The second state 100b of the electronic device <NUM> may mean a state in which the housing <NUM> is expanded.

When the state of the electronic device <NUM> is switched from the first state 100a to the second state 100b according to the movement of the second housing <NUM>, the second portion <NUM> of the flexible display <NUM> may be drawn out (or exposed) from the inside of the electronic device <NUM> to the outside. When the flexible display <NUM> is drawn out, it may mean that the flexible display <NUM> is viewable from the exterior of the electronic device <NUM>. When the electronic device <NUM> is switched from the second state 100b to the first state 100a according to the movement of the second housing <NUM>, the second portion <NUM> of the flexible display <NUM> is capable of being drawn into the interior of the electronic device <NUM>. According to an embodiment, when the flexible display <NUM> is drawn into, it may mean that at least a portion (e.g., the second portion <NUM>) of the flexible display <NUM> is not viewable from the exterior of the electronic device <NUM>.

The flexible display <NUM> includes a first portion <NUM> that can always be exposed and can generally be flat and rigid. The display <NUM> also includes a second portion <NUM> that is bendable. The second portion <NUM> can be wound about a roller <NUM>. As the electronic device <NUM> is transitioned from a first state to a second state, an intermediate state, the second portion <NUM> is unwound from the roller <NUM>. As the electronic device <NUM> is transitioned from the second state to the first state, also the intermediate state, the second portion <NUM> is wound about the roller <NUM>.

<FIG> illustrates a front perspective view of the electronic device according to an embodiment.

<FIG> is a front perspective view illustrating an intermediate state of the electronic device. The intermediate state may refer to a state in which the electronic device <NUM> is in the process of being switched from the first state 100a (e.g., the contracted state) to the second state 100b (e.g., expanded state).

<FIG> illustrates the electronic device <NUM> viewed in the direction P of <FIG>.

The drawing <A-A'> is a view illustrating a cross section of the electronic device <NUM> taken along line A-A'.

The electronic device <NUM> may include a housing <NUM>, a flexible display <NUM>, and a roller <NUM>. The flexible display <NUM> may include a pixel layer and a window <NUM>.

The roller <NUM> may be disposed inside the housing <NUM>. According to an embodiment, at least a portion of the flexible display <NUM> may be configured to be wound around the roller <NUM>.

The window <NUM> may be disposed on top of the pixel layer.

The window <NUM> may include a non-rolling portion <NUM> and a rolling portion <NUM>. The non-rolling portion <NUM> may correspond to, for example, the first portion <NUM> of <FIG>, and the rolling portion <NUM> may correspond to the second portion <NUM> in <FIG>. For example, the non-rolling portion <NUM> of the window <NUM> may be always visually exposed to the exterior, and at least a portion of the rolling portion <NUM> of the window <NUM> may be selectively exposed to the exterior of the electronic device based on the sliding state of the electronic device.

The non-rolling portion <NUM> may be provided on the second housing <NUM>. The rolling portion <NUM> may be provided on the first housing <NUM>. The rolling portion <NUM> may be provided adjacent to the roller <NUM>.

When the electronic device <NUM> is switched from the second state 100b to the first state 100a, the flexible display <NUM> may be wound around the roller <NUM>. According to an embodiment, as the flexible display <NUM> is wound around the roller <NUM>, at least a portion of the rolling portion <NUM> of the electronic device <NUM> may be drawn into the interior of the electronic device <NUM>.

A specific embodiment related to the window <NUM> will be described later with reference to <FIG>, <FIG>, and <FIG>. The window <NUM> includes different thicknesses. Since a part of the flexible display is wound about roller <NUM>, the window <NUM> includes a first region <NUM>, and second region <NUM>, and a third region <NUM>. The third region <NUM> which is the thinnest is disposed in the portion of the second part <NUM> of the display <NUM> that is wound about the roller <NUM>. The second region <NUM> is between the disposed at the border of the first part <NUM> and the second part <NUM> of the display <NUM>. The second region <NUM> has an incline <NUM> in thickness. The incline <NUM> in thickness can cause the content that is displayed to appear seamless from the second part <NUM> of the display <NUM> to the first part <NUM> to the user.

<FIG> is a view illustrating a laminated structure of a display of an electronic device according to an embodiment.

Referring to <FIG>, the flexible display <NUM> of the electronic device <NUM> according to an embodiment may include a pixel layer <NUM> and a window <NUM>. The flexible display <NUM> of the electronic device <NUM> according to certain embodiments may further include at least one of an absorption layer <NUM>, a coating layer <NUM>, and a protective layer <NUM>.

The pixel layer <NUM> can include organic light emitting diodes (OLEDs) or (AMOLEDs) and thin film transistors (TFT) that make up the actual pixels that display content.

A window <NUM> to be described later may correspond to the window <NUM> described above with reference to <FIG>.

The absorption layer <NUM> may be laminated between the window <NUM> and the pixel layer <NUM>. The absorption layer <NUM> may have a thickness of <NUM>. However, the thickness of the absorption layer <NUM> is not limited thereto. For example, the absorber layer <NUM> may have a thickness greater than <NUM>.

By forming the absorption layer <NUM>, it is possible to prevent damage to the pixel layer <NUM> from an external impact.

The window <NUM> to be described later may correspond to the window described above with reference to <FIG>. The window <NUM> may be formed of a transparent material. For example, the window <NUM> may include at least one of a glass material and a transparent plastic material, or some combination, thereof.

The window <NUM> may include a first region <NUM>, a second region <NUM>, and a third region <NUM>.

The thickness of the window <NUM> may change based on an inclination <NUM>. The inclination <NUM> may include a first inclination <NUM> and a second inclination <NUM>.

For example, the window <NUM> may include a first region <NUM> in which the thickness of the window <NUM> is substantially constant, constant, or within <NUM>% of constant (constant shall now be understood to include substantially constant or within <NUM>% deviation).

The window <NUM> may include a second region <NUM> that extends from one end of the first region <NUM> and is configured such that the thickness of the window <NUM> gradually decreases, based on the first inclination <NUM>, in a direction away from the one end of the first region <NUM>.

The window <NUM> may include a third region <NUM> that extends from one end of the second region <NUM> and is configured such that the thickness of the window <NUM> gradually decreases, based on the second inclination <NUM>, in a direction away from the one end of the second region <NUM>.

Herein, the inclination <NUM> means that the thickness of the window <NUM> changes based on a curvature (round) or a diagonal. For example, the thickness of the window <NUM> may decrease or increase with a constant curvature in at least a partial region. According to another embodiment, the thickness of the window <NUM> may decrease or increase with a constant slope (substantially constant, or within <NUM>%) in at least a partial region. In addition, the thickness of the window may change by mixing a constant curvature and a diagonal having a constant slope.

However, the inclination is not limited to a change in a curvature (round) or a diagonal. For example, the thickness of the window <NUM> may change so that a step is provided between regions having different thicknesses.

The first inclination <NUM> and the second inclination <NUM> may be different from each other. For example, the first inclination <NUM> may mean an amount of change in thickness of a curved surface that changes with a curvature, and the second inclination <NUM> may mean an amount of change in thickness of an inclined surface in which the thickness changes at a constant rate. As another example, the first inclination <NUM> may be greater than the second inclination <NUM>. According to another embodiment, the first inclination <NUM> may be smaller than the second inclination <NUM>.

When the thickness of the window <NUM> gradually decreases based on the inclination <NUM>, it may include the case in which the thickness of the window <NUM> gradually decreases in a round or diagonal in a direction away from the first region <NUM>.

At least a portion of the second region <NUM> and/or at least a portion of the third region <NUM> may be drawn into the interior of the electronic device as the flexible display <NUM> changes from the second state 100b to the first state 100a. For example, the third region <NUM> may be provided as a region corresponding to the rolling portion <NUM>. For example, at least a portion of the second region <NUM> may be provided as a region corresponding to the rolling portion <NUM>.

The flexible display <NUM> may be wound around the roller <NUM> as the electronic device <NUM> changes from the second state 100b to the first state 100a.

The flexible display <NUM> is wound around the roller <NUM>, at least a portion of the second region <NUM> and/or at least a portion of the third region <NUM> may be drawn into the interior of the electronic device.

The height of the first region <NUM> in the first direction (e.g., the +z-direction) may be within a range of <NUM> to <NUM>. For example, the height of the first region <NUM> in the first direction may be within a range of about <NUM> to about <NUM> from the surface in which the window <NUM> and the adhesive layer <NUM> are in contact with each other.

The height of the second region <NUM> and the third region <NUM> in the first direction (e.g., the +z direction) may be within a range of <NUM> to <NUM>. For example, the height of the second region <NUM> and the third region <NUM> in the first direction may be within the range of about <NUM> to about <NUM> from the surface in which the window <NUM> and the adhesive layer <NUM> are in contact with each other.

The above-mentioned height in the first direction (e.g., the +z direction) may mean the thickness of the window <NUM>. For example, the height in the first direction (e.g., the +z-direction) may mean the length of the window <NUM> extending in the first direction (e.g., the +z-direction) from the surface in which the window <NUM> and the adhesive layer <NUM> meet.

However, the heights of the first region <NUM>, the second region <NUM>, and the third region <NUM> are not limited thereto. For example, the heights of the second region <NUM> and the third region <NUM> in the first direction (e.g., the +z-direction) may be greater than <NUM>.

Since the thicknesses of the second region <NUM> and the third region <NUM> are smaller than the thickness of the first region <NUM>, at least a portion of the second region <NUM> and the third region <NUM> may be drawn into the interior of the electronic device <NUM>.

Referring to <FIG>, the coating layer <NUM> according to an embodiment may be laminated on the window. The first surface of the coating layer <NUM> facing the front surface of the electronic device <NUM> may be in contact with the window <NUM>, and the second surface of the coating layer <NUM> facing the rear surface of the electronic device <NUM> may be in contact with the protective layer <NUM>.

The coating layer <NUM> may be formed of a material having a lower hardness than that of the window <NUM>. The coating layer <NUM> may be formed of at least one of an optically clear adhesive (OCA) and an optically clear resin (OCR). The coating layer <NUM> may be formed of a transparent material.

According to an embodiment, since the coating layer <NUM> is provided, the same level of refractive index may be provided in the first region <NUM>, the second region <NUM>, and the third region <NUM> of the window <NUM>. The electronic device <NUM> may include a display <NUM> with improved visibility since the boundaries between the first portion <NUM> and the second portion <NUM>, as well as the first region <NUM>, the second region <NUM>, and the third region <NUM> do not appear visible from the exterior due to the same level of refractive index. Accordingly, content displayed in the pixel layer <NUM> appears continuous.

In addition, according to an embodiment, since the display <NUM> includes the coating layer <NUM>, the electronic device <NUM> may implement the display <NUM> having a constant thickness while including the window <NUM> having a variable thickness structure. It is noted that the combined height of the coating layer <NUM> and the window <NUM> in the first, second, and third regions is substantially constant. Thus, the coating layer has different thicknesses in the different regions.

The flexible display <NUM> may further include an adhesive layer <NUM>. For example, the adhesive layer <NUM> may be formed of a pressure-sensitive adhesive (PSA). The absorption layer <NUM> and the window <NUM> may adhere to each other by the adhesive layer <NUM>.

It is noted that in certain embodiments, the coating layer <NUM> may be disposed below the window <NUM>, and directly above the absorption layer <NUM>.

<FIG> is a view illustrating a laminated structure of a display of an electronic device according to another embodiment.

<FIG> is a view illustrating a coating layer <NUM> disposed between the window <NUM> and the display module <NUM>, unlike the coating layer <NUM> in <FIG>.

The thickness of the window <NUM> may vary based on the inclination <NUM>. According to one embodiment, the inclination <NUM> may include a first inclination <NUM> and a second inclination <NUM>.

For example, the window <NUM> may include a first region <NUM> in which the thickness of the window <NUM> is constant.

The second region <NUM> and the third region <NUM> may be provided in the form of being gradually spaced apart from the pixel layer <NUM> or the absorption layer <NUM>. As the second region <NUM> and the third region <NUM> are provided in the form of being spaced apart from each other, the display <NUM> may include an empty space. For example, an empty space may be provided between the second region <NUM> and the third region <NUM> and the absorption layer <NUM>.

The coating layer <NUM> may be disposed in the empty space. For example, the coating layer <NUM> may be laminated between the window <NUM> and the display module <NUM>. According to another embodiment, the coating layer <NUM> may be laminated between the window <NUM> and the absorption layer <NUM>.

The inclination <NUM> described with reference to <FIG> may refer to the inclination <NUM> of <FIG>. The coating layer <NUM> may be formed of substantially the same material as the coating layer <NUM> described above with reference to <FIG>.

The flexible display <NUM> may further include an adhesive layer <NUM>. The adhesive layer <NUM> of <FIG> may refer to the adhesive layer <NUM> of <FIG>. For example, the adhesive layer <NUM> may be formed of a pressure-sensitive adhesive (PSA).

The adhesive layer <NUM> may be disposed between the protective layer <NUM> and the window <NUM>. The protective layer <NUM> and the window <NUM> may adhere to each other by the adhesive layer <NUM>.

<FIG> is a view illustrating a laminated structure in which a portion of the window <NUM> of the electronic device <NUM> directly adheres to the pixel layer <NUM>, according to an embodiment.

The window <NUM> of <FIG> may further include a fourth region <NUM> and a fifth region <NUM>.

By further including the fourth region <NUM> and the fifth region <NUM>, the electronic device <NUM> may implement a structure of the display <NUM> having improved adhesion. For example, since the fifth region <NUM> of the window directly faces and adheres to the pixel layer <NUM>, the electronic device <NUM> may implement the structure of the display <NUM> with improved adhesion.

The coating layer <NUM> may be laminated on the pixel layer <NUM>, and the window <NUM> may be stacked on the coating layer <NUM>.

The window <NUM> may include a first region <NUM>, a second region <NUM>, a third region <NUM>, a fourth region <NUM>, and a fifth region <NUM>.

The fifth region <NUM> may include an end of the window <NUM> on the roller <NUM> side.

As the flexible display <NUM> is wound around the roller, at least a portion of the fourth region <NUM> and at least a portion of the fifth region <NUM> may be drawn into the interior of the electronic device <NUM>.

The fourth region <NUM> may extend from the third region <NUM>. The fourth region <NUM> may extend from one end of the third region <NUM>.

The fourth region <NUM> may include a third inclination <NUM>. For example, the fourth region <NUM> may include a region in which the thickness of the window <NUM> gradually increases, based on a third inclination <NUM> that is distinguished from the first inclination <NUM> and the second inclination <NUM>, in a direction away from the one end of the third region <NUM>.

The first inclination <NUM>, the second inclination <NUM>, and the third inclination <NUM> mean that the thickness of the window <NUM> changes based on a round or a diagonal. The thickness of the window <NUM> may decrease or increase with a constant curvature in at least a partial region.

The thickness of the window <NUM> may decrease or increase with a constant slope in at least a partial region. In addition, the thickness of the window <NUM> may change by mixing a constant curvature and a diagonal having a constant slope.

For example, the thickness of the window <NUM> of the fourth region <NUM> may increase with a constant curvature. According to another embodiment, the thickness of the window <NUM> of the fourth region <NUM> may increase with a constant slope. According to another embodiment, the thickness of the window <NUM> of the fourth region <NUM> may increase by mixing a constant curvature and a diagonal having a constant slope. According to an embodiment, one surface of the fourth region <NUM> of the window <NUM> may face the coating layer <NUM>.

The fifth region <NUM> may extend from the fourth region <NUM>. The fifth region <NUM> may include a region in which the thickness of the window <NUM> is constant.

The first surface <NUM> of the fifth region <NUM> may directly face the pixel layer <NUM>. The second surface <NUM> perpendicular to the first surface <NUM> may face the first housing <NUM> (<FIG>) of the electronic device <NUM> in the first state 100a.

According to an embodiment, since the fifth region <NUM> of the window <NUM> directly faces the pixel layer <NUM>, the fifth region <NUM> of the window <NUM> and the pixel layer <NUM> may directly adhere to each other. According to an embodiment, since at least one region of the window <NUM> and the pixel layer <NUM> directly adhere to each other, the electronic device <NUM> may implement the structure of a display <NUM> having improved adhesion.

<FIG> illustrates graphs representing characteristics of a display having a variable thickness on a rolling portion according to an embodiment.

<FIG> illustrates graphs showing an expansion rate depending on the thickness of the window <NUM>. Referring to <FIG>, each horizontal axis represents the thickness of the window <NUM>, and each vertical axis represents the expansion rate or flexibility of the window <NUM> or the display <NUM>. As can be seen, when the thickness is less, the window <NUM> or display <NUM> is more flexible. The flexibility of the window <NUM> is generally the flexibility of the display <NUM> since the window <NUM> is the most rigid part of the display <NUM>.

As the amount of change in the thickness of the window <NUM> increases, the amount of change in the expansion rate of the window <NUM> may increase. For example, as the difference between the thicknesses of the respective regions of the window <NUM> increases, the expansion rate of the window <NUM> or the display <NUM> may increase.

When the electronic device <NUM> has a variable thickness structure <NUM> in the window <NUM> in which the thickness gradually changes, the amount of change in the expansion rate of the window <NUM> or the display <NUM> may be reduced compared to the case in which the electronic device <NUM> has a differential thickness structure <NUM> of the window <NUM> in which the thickness is discretely changed, within a specific thickness range.

For example, the graph of the differential thickness structure <NUM> may include a first point <NUM> having a first expansion rate e1 at a first thickness t1 and a second point <NUM> having a second expansion rate e2 at a second thickness t2. According to an embodiment, as the thickness of the electronic device decreases from the first thickness t1 to the second thickness t2, the expansion rate of the window <NUM> or the display <NUM> may increase from the first expansion rate e1 to the second expansion rate e2.

The graph of the variable thickness structure <NUM> may include a first point <NUM> having a first expansion rate e1 when the window <NUM> has a second thickness t1, a second point <NUM> having a second expansion rate e2 when the window <NUM> has a second thickness t2, a third point <NUM> having a third expansion rate e3 when the window <NUM> has a third thickness t3, a fourth point <NUM> having a fourth expansion rate e4 when the window <NUM> has a fourth thickness t4, and a fifth point <NUM> having a fifth expansion rate e5 when the window <NUM> has a fifth thickness t5.

As the thickness of the electronic device decreases from the first thickness t1 to the second thickness t2, the expansion rate of the window <NUM> may increase from the first expansion rate e1 to the second expansion rate e2.

As the amount of change in the thickness of the window <NUM> increases, the amount of change in the expansion rate of the window <NUM> or the display <NUM> may increase, and as the amount of change in the thickness of the window <NUM> decreases, the amount of change in the expansion rate of the window <NUM> or the display <NUM> may decrease.

Referring to the graph of <FIG>, The variable thickness structure <NUM> may include the change amount of the expansion rate (e2-e1) of the window <NUM> or the display <NUM> as decreasing from the first thickness t1 of the first point <NUM> to the second thickness t2 of the second point <NUM>.

The differential thickness structure <NUM> may include the amount of change in the expansion rate (e2- e1) as the thickness decreases from the first thickness t1 of the first point <NUM> to the second thickness t2 of the second point <NUM>.

Referring to the graph of <FIG>, as the thickness change amount (t2-t1) of the variable thickness structure <NUM> is smaller than the change amount (t2-t1) of the differential thickness structure <NUM>, the change amount of the expansion rate (e2-e1) of the variable thickness structure <NUM> may be smaller than that of the differential thickness structure <NUM>.

When the change amount of the expansion rate (e2-e1) of the window <NUM> or the display <NUM> increases, wrinkles may occur on a boundary surface of the display <NUM> of the electronic device <NUM>. Accordingly, visibility of the electronic device <NUM> may be reduced.

When the electronic device <NUM> includes the display <NUM> having the variable thickness structure <NUM>, the change amount of the expansion rate (e2-e1) of the window <NUM> or the display <NUM> may decrease. Accordingly, since wrinkles due to the expansion of the window <NUM> or the display <NUM> do not occur on a boundary surface the window <NUM> having the variable thickness structure <NUM>, the electronic device <NUM> may include a display <NUM> with improved visibility.

<FIG> is a view illustrating a cross section of a window according to an embodiment.

The window <NUM> may include a first region <NUM>, a second region <NUM>, and a third region <NUM>. The first region <NUM> may include a region in which the thickness of the window <NUM> is constant.

The second region <NUM> may extend from one end of the first region <NUM> and may be configured as a region in which the thickness of the window <NUM> gradually decreases, based on a first inclination, in a direction away from the one end of the first region <NUM>.

The second region <NUM> may include a first boundary surface <NUM>. The first boundary surface <NUM> of the second region <NUM> may be provided adjacent to the first region <NUM>. The first boundary surface <NUM> may be connected to the first region <NUM> and may have a first curvature.

The first boundary surface <NUM> extends from the first region <NUM>, and may provide a boundary surface in which the thickness of the window gradually decreases, based on the first curvature, in a direction away from the first region <NUM>.

According to an embodiment, by providing the first boundary surface <NUM> of the second region <NUM>, the window <NUM> may be configured as a window <NUM> having a gradually reduced thickness.

According to an embodiment, as the thickness of the window <NUM> gradually decreases, the change amount of the expansion rate (e2-e1) of the window <NUM> or the display <NUM> according to the change in the thickness of the window <NUM> decreases. Thus, the electronic device <NUM> may include a display <NUM> with improved visibility.

<FIG> is a view illustrating a cross section of a window according to another embodiment.

According to an embodiment, <FIG> may include a second region <NUM> having a shape different from that of the window <NUM> of <FIG>.

The second region <NUM> may include a first boundary surface <NUM>. According to an embodiment, unlike the first boundary surface <NUM> of the second region <NUM> of <FIG>, the first boundary surface <NUM> of the second region <NUM> of <FIG> may be provided adjacent to the third region <NUM>. The first boundary surface <NUM> may be connected to the third region <NUM> and may have a first curvature.

The first boundary surface <NUM> is connected to the third region <NUM>, and may provide a boundary surface in which the thickness of the window gradually decreases, based on the first curvature, in a direction toward the third region <NUM>.

According to an embodiment, as the thickness of the window <NUM> gradually decreases, the change amount of the expansion amount (e2-e1) of the window <NUM> or the display <NUM> according to the change of the thickness of the window <NUM> decreases. Thus, the electronic device <NUM> may include a display <NUM> with improved visibility.

The second region <NUM> of the window <NUM> of <FIG> may be provided in the form in which the second region <NUM> of the window <NUM> of <FIG> and the second region <NUM> of the window <NUM> of <FIG> are mixed.

The second region <NUM> may include a first boundary surface <NUM>, a second boundary surface <NUM>, and a first inclined surface <NUM>. The first boundary surface <NUM> may be provided adjacent to the first region <NUM>, and the second boundary surface <NUM> may be provided adjacent to the third region <NUM>.

The first boundary surface <NUM> may be connected to the first region <NUM> and may have a first curvature. The second boundary surface <NUM> may be connected to the third region <NUM> and may have a second curvature.

The first boundary surface <NUM> extends from the first region <NUM>, and may be provided as a boundary surface in which the thickness of the window gradually decreases, based on the first curvature, in a direction away from the first region <NUM>.

The second boundary surface <NUM> is connected to the third region <NUM>, and may be provided as a boundary surface in which the thickness of the window gradually decreases, based on the second curvature, in a direction toward the third region <NUM>.

The second region <NUM> may include a first inclined surface <NUM> that extends from the first boundary surface <NUM> and configured such that the thickness of the window gradually decreases based on the first inclination. The second region <NUM> may be provided as a region that extends from the first boundary surface <NUM> to form a first inclined surface <NUM> and is connected to the second boundary surface <NUM>.

According to an embodiment, by providing the first boundary surface <NUM>, the second boundary surface <NUM>, and the first inclined surface <NUM> of the second region <NUM>, the thickness of the window <NUM> may gradually decrease.

According to an embodiment, as the thickness of the window <NUM> gradually decreases, the change amount of the expansion amount (e2-e1) of the window <NUM> or the display <NUM> according to the change in the thickness of the window <NUM> decreases. Thus, the electronic device <NUM> may include a display <NUM> with improved visibility.

The first inclination may include a first curvature <NUM>. For example, the second region <NUM> may be configured as a region in which the thickness of the window <NUM> gradually decreases based on the first curvature <NUM>.

The surface of the window <NUM> that is oriented in the first direction (e.g., the +z-direction) may be referred to as the top surface, and the surface oriented in the second direction (e.g., the -z direction) may be referred to as the bottom surface.

The second region <NUM> may be provided from the upper end <NUM> of the second region <NUM> adjacent to the first region <NUM> to the lower end <NUM> of the second region <NUM> adjacent to the third region <NUM> while forming a first curvature <NUM>.

For example, the thickness of the window <NUM> may gradually decreases while forming the first curvature <NUM> in the form in which the slope starts from verticality at the upper end <NUM> of the second region <NUM> and gradually changes into horizontality toward the lower end <NUM> of the second region <NUM>.

According to an embodiment, since the thickness of the window <NUM> of the second region <NUM> gradually decreases with the first curvature <NUM>, the change amount of the expansion rate (e2-e1) of the window <NUM> or the display <NUM> is reduced. Thus, the electronic device <NUM> may include a display <NUM> with improved visibility.

The first inclination may include a first curvature <NUM>. The second region <NUM> may be configured as a region in which the thickness of the window <NUM> gradually decreases based on the first curvature <NUM>.

For example, the second region <NUM> may be provided from the upper end <NUM> of the second region <NUM> adjacent to the first region <NUM> to the lower end <NUM> of the second region <NUM> adjacent to the third region <NUM> while forming a first curvature <NUM>.

The first curvature <NUM> in <FIG> may be distinguished from the first curvature <NUM> in <FIG>. The first curvature <NUM> of the second region <NUM> may be configured to be inverse to the first curvature <NUM> of the second region <NUM> in <FIG>.

For example, the thickness of the window <NUM> may gradually decreasewhile forming the first curvature <NUM> in the form in which the slope starts from horizontality at the upper end <NUM> of the second region <NUM> and gradually changes into verticality toward the lower end <NUM> of the second region <NUM>.

The third region <NUM> may extend from one end of the second region <NUM> and may be configured as a region in which the thickness of the window <NUM> gradually decreases, based on a second inclination, in a direction away from the one end of the second region <NUM>.

The first inclination may include a first slope <NUM>. The second region <NUM> may be configured in the form in which the thickness of the window <NUM> gradually decreases while forming a diagonal based on the first slope <NUM>.

For example, the second region <NUM> may be configured in a constant first slope <NUM> from a first end <NUM> of the second region <NUM> adjacent to the first region <NUM> to a second end <NUM> of the second region <NUM> adjacent to the third region <NUM>.

The second inclination may include a second slope <NUM>. The third region <NUM> may be configured in the form in which the thickness of the window <NUM> gradually decreases while forming a diagonal based on the second slope <NUM>.

For example, the third region <NUM> may be configured in a constant second slope <NUM> from the second end <NUM> of the second region <NUM> to the third end <NUM> of the third region <NUM>.

The first inclination and the second inclination may be distinguished from each other. For example, the first inclination may include an inclination having a first slope <NUM>, and the second inclination may include an inclination having a second slope <NUM>. For example, the first slope <NUM> may have a slope of a first size, and the second slope <NUM> may have a slope of a second size smaller than the first size.

However, the sizes of the slopes are not limited thereto. For example, the second slope <NUM> may have a slope of a second size greater than the first size of the first slope <NUM>.

The thickness of the window <NUM> may gradually decrease while forming the first slope <NUM> from the first end <NUM> of the second region <NUM> to the second end <NUM> of the second region <NUM>.

According to another embodiment, the thickness of the window <NUM> may gradually decrease while forming the second slope <NUM> from the second end <NUM> of the second region <NUM> to the third end <NUM> of the third region <NUM>.

According to an embodiment, when the thickness of the window <NUM> gradually decreases with the first slope <NUM> and the second slope <NUM>, the change amount of the expansion rate (e2-e1) of the window <NUM> according to the change in the thickness of the window <NUM> may be reduced.

Through this, the electronic device <NUM> may include a display <NUM> with improved visibility.

The window <NUM> may include a first region <NUM>, a second region <NUM>, a third region <NUM>, and a fourth region <NUM>. The first region <NUM> may include a region in which the thickness of the window <NUM> is constant.

The fourth region <NUM> may extend from one end of the thrid region <NUM> and may be configured as a region in which the thickness of the window <NUM> gradually decreases, based on a third inclination, in a direction away from the one end of the third region <NUM>.

The first inclination may include the inclination of the first slope <NUM>, the second inclination may include the slope of the second slope <NUM>, and the third inclination may include the inclination of the thrid slope <NUM>.

According to an embodiment, one or more of the first slope <NUM>, the second slope <NUM>, and the third slope <NUM> are distinguished from each other. For example, the first slope <NUM> may have a slope of a first size, and the second slope <NUM> may have a slope of a second size greater than the first size. In addition, the third slope <NUM> may have a slope of a third size that is greater than the slope of the first size but smaller than the slope of the second size.

However, the sizes of the first slope <NUM>, the second slope <NUM>, and the third slope <NUM> are not limited thereto. For example, the first slope <NUM> may have a slope of a first size, the second slope <NUM> may have a slope of a second size smaller than the first size, and the third slope <NUM> may have a sloe of a third size smaller than the second size.

The second region <NUM> may be configured as a region in which the thickness of the window <NUM> gradually decreases while forming a diagonal having the first slope <NUM>.

The third region <NUM> may be configured as a region in which the thickness of the window <NUM> gradually decreases while forming a diagonal having the second slope <NUM>.

The fourth region <NUM> may be configured as a region in which the thickness of the window <NUM> gradually decreases while forming a diagonal having the third slope <NUM>.

For example, the second region <NUM> may be configured to have a constant first slope <NUM> from a first end <NUM> of the second region <NUM> adjacent to the first region <NUM> to a second end <NUM> of the second region <NUM> adjacent to the third region <NUM>.

For example, the third region <NUM> may be configured to have a constant second slope <NUM> from the second end <NUM> of the second region <NUM> to the third end <NUM> of the third region <NUM> adjacent to the fourth region <NUM>.

For example, the fourth region <NUM> may have a constant slope <NUM> from the third end <NUM> of the third region <NUM> adjacent to the fourth region <NUM> to the fourth end <NUM> of the fourth region <NUM>.

According to an embodiment, by further including the fourth region <NUM> and configuring an inclined structure having a constant inclination, the electronic device <NUM> may include a window <NUM> in which the change amount of the expansion rate (e2-e1) of the window <NUM> or display <NUM> according to a change in the thickness of the window <NUM>. Accordingly, the electronic device <NUM> may include a display <NUM> with improved visibility.

The cross section of the window <NUM> of <FIG> may be configured as a cross section of a window in which the window <NUM> of <FIG> and the window <NUM> of <FIG> are mixed.

The first inclination may include an inclination of a first slope <NUM>, and the second inclination may include a first curvature <NUM>.

The second region <NUM> may include a first boundary surface <NUM>, a second boundary surface <NUM>, and a first inclined surface. The first boundary surface <NUM> may be provided adjacent to the first region <NUM>, and the second boundary surface <NUM> may be provided adjacent to the third region <NUM>. The first inclined surface may be provided as an inclined surface having a first slope <NUM>.

The first boundary surface <NUM> may be connected to the first region <NUM> and may have a second curvature. The second boundary surface <NUM> may be connected to the third region <NUM> and may have a third curvature.

The first boundary surface <NUM> extends from the first region <NUM>, and may provide a boundary surface in which the thickness of the window gradually decreases, based on the second curvature, in a direction away from the first region <NUM>.

The second boundary surface <NUM> is connected to the third region <NUM>, and may provide a boundary surface in which the thickness of the window gradually decreases, based on the thrid curvature, in a direction toward the third region <NUM>.

The second region <NUM> may be configured as region that is configured as a first inclined surface extending from the first boundary surface <NUM> to have the first slope <NUM> and connected to the second boundary surface <NUM>.

The third region <NUM> may be configured as a region in which the thickness of the window <NUM> gradually decreases based on the first curvature <NUM>.

For example, the third region <NUM> may be configured, based on the first curvature <NUM>, from the end of the second boundary surface <NUM> of the second region <NUM> adjacent to the third region <NUM> to the lower end <NUM> of the third region <NUM>.

However, the boundaries and inclinations of the second region <NUM> and the third region <NUM> are not limited thereto.

For example, the third region <NUM> may include a first boundary surface <NUM>, a second boundary surface <NUM>, and a first inclined surface having a first slope <NUM>, and the second region <NUM> may include an inclination having a first curvature <NUM>.

According to another embodiment, the second region <NUM> may include a first boundary surface <NUM>, a second boundary surface <NUM>, and an inclination having a first curvature <NUM>.

According to an embodiment, by further including the first boundary surface <NUM> of the second region <NUM>, the first inclined surface having the first slope <NUM>, the second boundary surface <NUM>, and the third region <NUM> having the first curvature <NUM>, the electronic device <NUM> may include a window <NUM> in which the change amount of the expansion rate (e2-e1) of the window <NUM> or the display <NUM> according to the change in the thickness of the window <NUM> is reduced.

Accordingly, the electronic device <NUM> may include a display <NUM> with improved visibility.

The cross sections of the second and third regions of the window <NUM> of <FIG>, the window <NUM> of <FIG>, and the window <NUM> of <FIG> may include the cross section of at least one of the windows of <FIG>.

For example, the cross section of the window <NUM> of <FIG> may refer to the window <NUM> of <FIG>.

According to another embodiment, the cross section of the window <NUM> of <FIG> may have that of the window <NUM> of <FIG>.

According to another embodiment, the second region <NUM> of the window <NUM> of <FIG> may have the cross section of the window <NUM> of <FIG>, and the third region <NUM> may have the cross-section of the window <NUM> of <FIG>.

Referring to <FIG>, the flexible display <NUM> of the electronic device <NUM> according to an embodiment may include a pixel layer <NUM> and a window <NUM>. According to certain embodiments, the flexible display <NUM> may further include at least one of an absorption layer <NUM>, a coating layer <NUM>, or a protective layer <NUM>.

The window <NUM> may include a first window portion <NUM> and a second window portion <NUM> disposed adjacent to the first window portion. The first window portion <NUM> may include a first region. The second window portion <NUM> may include a second region <NUM> and/or a third region <NUM>.

The first window portion <NUM> and the second window portion <NUM> may be laminated on the absorption layer <NUM> by an adhesive layer.

The first window portion <NUM> may be disposed on the first portion <NUM> of the display <NUM>, and the second window portion <NUM> may be disposed on the second portion <NUM> of the display <NUM>.

According to an embodiment, as the electronic device <NUM> changes from the second state 100b to the first state 100a, the second region <NUM> and the third region <NUM> of the second window portion <NUM> may be at least partially drawn into the interior of the electronic device <NUM>.

The first window portion <NUM> and the second window portion <NUM> may be distinguished from each other. For example, the thickness of the first window portion <NUM> and the thickness of the second window portion <NUM> may be different from each other. However, the difference between the first window portion <NUM> and the second window portion <NUM> is not limited to the above-mentioned difference in thickness.

For example, the length of the first window portion <NUM> extending in one direction (e.g., the +y-direction) and the length of the second window portion <NUM> extending in one direction (e.g., the +y-direction) may be different from each other. According to another embodiment, the material of the first window portion <NUM> may be formed of a material having an expansion rate different from that of the second window portion <NUM>.

The second window portion <NUM> may be configured as a window including a cross section of at least one of the windows of <FIG>.

For example, the second region <NUM> of the second window portion <NUM> may be configured to have the cross-section of the window <NUM> of <FIG>, and the third region <NUM> may be configured to have the cross-section of the window <NUM> of <FIG>.

According to an embodiment, by dividing the window into the first window portion <NUM> and the second window portion <NUM>, the electronic device <NUM> may include a display that blocks the occurrence of wrinkles according to the amount of change in the expansion rate (e2-e1) of the display <NUM>.

In addition, the display <NUM> having a differential inclination may be easily manufactured by using separate windows.

<FIG> is a view schematically illustrating an electronic device according to an embodiment within a network environment.

<FIG> is a block diagram illustrating an electronic device <NUM> in a network environment <NUM> according to certain embodiments. Referring to <FIG>, the electronic device <NUM> in the network environment <NUM> may communicate with an electronic device <NUM> via a first network <NUM> (e.g., a short-range wireless communication network), or at least one of an electronic device <NUM> or a server <NUM> via a second network <NUM> (e.g., a long-range wireless communication network). The electronic device <NUM> may communicate with the electronic device <NUM> via the server <NUM>. The electronic device <NUM> may include a processor <NUM>, memory <NUM>, an input module <NUM>, a sound output module <NUM>, a display module <NUM>, an audio module <NUM>, a sensor module <NUM>, an interface <NUM>, a connecting terminal <NUM>, a haptic module <NUM>, a camera module <NUM>, a power management module <NUM>, a battery <NUM>, a communication module <NUM>, a subscriber identification module(SIM) <NUM>, or an antenna module <NUM>. In some embodiments, at least one of the components (e.g., the connecting terminal <NUM>) may be omitted from the electronic device <NUM>, or one or more other components may be added in the electronic device <NUM>. In some embodiments, some of the components (e.g., the sensor module <NUM>, the camera module <NUM>, or the antenna module <NUM>) may be implemented as a single component (e.g., the display module <NUM>).

The processor <NUM> may include a main processor <NUM> (e.g., a central processing unit (CPU) or an application processor (AP)), or an auxiliary processor <NUM> (e.g., a graphics processing unit (GPU), a neural processing unit (NPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)) that is operable independently from, or in conjunction with, the main processor <NUM>.

The auxiliary processor <NUM> (e.g., the neural processing unit) may include a hardware structure specified for artificial intelligence model processing.

The receiver may be implemented as separate from, or as part of the speaker.

The display module <NUM> may include a touch sensor adapted to detect a touch, or a pressure sensor adapted to measure the intensity of force incurred by the touch.

The audio module <NUM> may obtain the sound via the input module <NUM>, or output the sound via the sound output module <NUM> or a headphone of an external electronic device (e.g., an electronic device <NUM>) directly (e.g., wiredly) or wirelessly coupled with the electronic device <NUM>.

The connecting terminal <NUM> may include, for example, a HDMI connector, a USB connector, a SD card connector, or an audio connector (e.g., a headphone connector).

The communication module <NUM> may include a wireless communication module <NUM> (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module <NUM> (e.g., a local area network (LAN) communication module or a power line communication (PLC) module).

The wireless communication module <NUM> may support a peak data rate (e.g., 20Gbps or more) for implementing eMBB, loss coverage (e.g., 164dB or less) for implementing mMTC, or U-plane latency (e.g., <NUM> or less for each of downlink (DL) and uplink (UL), or a round trip of <NUM> or less) for implementing URLLC.

The antenna module <NUM> may include an antenna including a radiating element composed of a conductive material or a conductive pattern formed in or on a substrate (e.g., a printed circuit board (PCB)). The antenna module <NUM> may include a plurality of antennas (e.g., array antennas). According to certain embodiments, the antenna module <NUM> may form a mmWave antenna module. The mmWave antenna module may include a printed circuit board, a RFIC disposed on a first surface (e.g., the bottom surface) of the printed circuit board, or adjacent to the first surface and capable of supporting a designated high-frequency band (e.g., the mmWave band), and a plurality of antennas (e.g., array antennas) disposed on a second surface (e.g., the top or a side surface) of the printed circuit board, or adjacent to the second surface and capable of transmitting or receiving signals of the designated high-frequency band.

The external electronic device <NUM> or the server <NUM> may be included in the second network <NUM>.

According to certain embodiments, a rollable display device may include: a housing; a roller disposed inside the housing; and a flexible display configured to be at least partially wound on the roller, the flexible display including a pixel layer and a window, wherein the window may include: a first region having a substantially constant thickness, a second region extending from one end of the first region having a thickness that gradually decreases with a first inclination, in a direction away from the one end of the first region, and a third region extending from one end of the second region having a thickness that gradually decreases, with a second inclination different from the first inclination, in a direction away from the second region, and wherein at least a portion of the second region and the third region may be configured to be drawn into interior of the rollable display device when the flexible display is wound around the roller.

According to an embodiment, the flexible display may include a coating layer laminated on the window.

According to an embodiment, the flexible display may include a coating layer, disposed between the window and the pixel layer.

According to an embodiment, the window may include a fourth region extending from the third region and a fifth region extending from the fourth region, wherein the fourth region has a thickness that gradually increases, with a third inclination different from the first inclination and the second inclination, in a direction away from the third region, wherein the fifth region has a substantially constant thickness and further comprises a first surface directly adhering to the pixel layer, and a second surface perpendicular to the first surface facing the housing of the rollable display device, and wherein at least a portion of the fourth region and at least a portion of the fifth region may be configured to be drawn into the interior of the rollable display device when the flexible display is wound around the roller.

According to an embodiment, the second region may include: a first boundary surface connected to the first region and having a first curvature, and a second boundary surface connected to the third region and having a second curvature.

According to an embodiment, the first inclination has a first curvature, and the second region has a thickness that gradually decreases based on the first curvature.

According to an embodiment, the first inclination has a first slope, and the second inclination has a second slope, wherein the second region has a thickness that gradually decreases while forming an oblique line having the first slope, and the third region has a thickness that gradually decreases while forming an oblique line having the second slope.

According to an embodiment, the first region may have a height in the first direction in a range of <NUM> to <NUM>, and the second region and the third region may have a height in the first direction in a range of <NUM> to <NUM>.

According to an embodiment, the first inclination has a first slope, and the second inclination has a first curvature, wherein the second region may include: a first boundary surface connected to the first region and having a second curvature different from the first curvature, and a second boundary surface connected to the third region and having a third curvature different from the first curvature and the second curvature, wherein the second region may extend from the first boundary surface and has a thickness that gradually decreases, based on the first slope, in a direction away from one end of the first boundary surface, and wherein the third region may extend from the second boundary surface of the second region, and has a thickness that gradually decreases, based on the first curvature, in a direction away from the second boundary surface of the second region.

According to an embodiment, the window may include a fourth region that faces one surface of the third region, wherein the fourth region may extend from another end of the third region and has a thickness that gradually decreases, based on a third inclination different from the first inclination and the second inclination, in a direction away from the another end of the third region, and at least a portion of the fourth region may be configured to be drawn into the rollable display device as the flexible display is wound around the roller.

According to an embodiment, the window may include a first window portion and a second window portion formed of a material different from that of the first window portion, wherein the first window portion forms the first region, and wherein the second window portion forms the second region and the third region.

According to an embodiment, the window may be formed of a transparent material.

According to an embodiment, the flexible display may include a protective layer, and the protective layer may be laminated on the window.

According to an embodiment, the flexible display may include an adhesive layer, and the adhesive layer may face the window, and adheres the window to adhere to a component of the flexible display.

According to an embodiment, the flexible display may include an absorption layer, and the absorption layer may be laminated between the pixel layer and the window and configured to absorb an impact on the flexible display.

According to various embodiments, the rollable display device may include: a housing; a roller disposed inside the housing; and a flexible display configured to be at least partially wound around the roller and including a window, wherein the window may include: a first window portion including a first region, wherein the first portion is always exposed to exterior, and a second window portion formed of a material different from that of the first window portion, wherein the second window portion may incl <IMG> ude: a second region facing one surface of the first region having a thickness that gradually decreases, with a first inclination, in a direction away from the one surface of the first region, and a third region extending from one end of the second region having a thickness that gradually decreases with a second inclination different from the first inclination, in a direction away from the one end of the second region, and wherein a part of the second window portion may be configured to be drawn into the rollable display device as the flexible display is wound around the roller.

According to an embodiment, the first inclination may include a first curvature, and the second region may be configured as a region in which the thickness of the window gradually decreases based on the first curvature.

According to an embodiment, the flexible display may include an absorption layer, and the absorption layer may be laminated on the flexible display to absorb an impact of the flexible display.

The electronic device according to certain embodiments may be one of various types of electronic devices.

It should be appreciated that certain embodiments of the present disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, of replacements for a corresponding embodiment without departing from the scope of the appended claims.

As used in connection with certain embodiments of the disclosure, the term "module" may include a unit implemented in hardware, software, or firmware, and may interchangeably be used with other terms, for example, "logic," "logic block," "part," or "circuitry". For example, The module may be implemented in a form of an application-specific integrated circuit (ASIC).

Certain embodiments as set forth herein may be implemented as software (e.g., the program <NUM>) including one or more instructions that are stored in a storage medium (e.g., internal memory <NUM> or external memory <NUM>) that is readable by a machine (e.g., the electronic device <NUM>).

According to an embodiment, a method according to certain embodiments of the disclosure may be included and provided in a computer program product.

Claim 1:
A rollable display device comprising:
a housing (<NUM>);
a roller (<NUM>) disposed inside the housing (<NUM>); and
a flexible display (<NUM>) configured to be at least partially wound on the roller (<NUM>), the flexible display (<NUM>) including a pixel layer (<NUM>) and a window (<NUM>, <NUM>, <NUM>, <NUM>),
wherein the window (<NUM>, <NUM>, <NUM>, <NUM>) includes:
a first region (<NUM>, <NUM>, <NUM>) having a substantially constant thickness,
a second region (<NUM>, <NUM>, <NUM>) extending from one end of the first region (<NUM>, <NUM>, <NUM>) having a thickness that gradually decreases with a first inclination, in a direction away from the one end of the first region (<NUM>, <NUM>, <NUM>), and
a third region (<NUM>, <NUM>, <NUM>) extending from one end of the second region (<NUM>, <NUM>, <NUM>) having a thickness that gradually decreases with a second inclination different from the first inclination, in a direction away from the second region (<NUM>, <NUM>, <NUM>), and
wherein at least a portion of the second region (<NUM>, <NUM>, <NUM>) and the third region (<NUM>, <NUM>, <NUM>) are configured to be drawn into interior of the rollable display device when the flexible display (<NUM>) is wound around the roller (<NUM>).