Patent Description:
An optical bonding process is used as a method of attaching the displays on the cover. The optical bonding process is a method of bonding the cover and the displays using an optical adhesive material. Such process, however, eliminates empty spaces between the cover and the displays, thereby lowering light reflectance of a display assembly.

The optical adhesive material is Optical Clear Resin (OCR) and Optical Clear Adhesive (OCA), for example. The optical adhesive material has a refractive index equivalent to that of a member with which the cover or the display is brought into contact, thereby lowering light reflectance at a boundary between the optical adhesive material and the member.

As another method of attaching the displays on the cover is an air gap method. According to this method, empty spaces are formed between the cover and the displays, and thus external light is reflected at a boundary between the cover and the corresponding empty space and even at a boundary between the display and the empty space. Therefore, the optical bonding process is mainly used in modern display devices requiring high resolution, high visibility and slim thickness, owing to higher visibility than the air gap method.

Upon the optical bonding process, an OCR of a liquid phase may be used as the optical adhesive material. In this case, a method is used in which a resin dam is formed along an edge of a surface, to which the display is attached, in order to evenly apply the liquid OCR on the surface.

In the method of forming the resin dam, liquid resin is coated on the cover and cured to form a dam shape, and adhesive resin is applied to an inside of the formed resin dam. It is possible to form a resin dam having a desired shape based on an amount of spreading of the liquid resin and an amount of deformation of the liquid resin under specific conditions.

For instance, <CIT> relates to adhering two workpieces to one another, wherein one workpiece is curved, such as adhering a touch panel and a curved display device or an LCD module and a curved cover glass and touch panel. In a first step, a first adhesive is disposed in the recesses of a mould (die), the curved workpiece is set onto the mould and the first adhesive is at least pre-cured, so that the first adhesive forms protrusions on the curved workpiece, wherein the outermost protrusions have a greater height forming a dam portion. The space between the dam portions is filled with a second adhesive, onto which the second workpiece is placed and adhered to the first workpiece during curing of the second adhesive.

However, in the case of attaching a display on a curved cover, it is difficult to form a resin dam in a uniform thickness or the like using liquid resin according to a curvature of the cover, which may cause a problem of lowering quality of a display assembly.

The related art has a problem that an optical adhesive material coated for attaching a display is not evenly coated on a curved cover when the display is attached on the curved cover.

The related art has a problem that a liquid optical adhesive material flows over an adhered portion, to which a display is attached (adhered, bonded), due to a tolerance generated during a manufacturing process, and thereby flows into another member.

The related art has a problem that bubbles remain in an adhered portion between a display and a cover when attaching the display.

It is an object of the present invention to avoid the problems of the related Art.

This object is solved by the present invention as defined in the independent claims.

According to aspects to better understand the present disclosure, one or more of the following effects can be provided.

First, by including a wall structure, according to the present invention, disposed on a cover and extending long along a side surface of an adhesive layer with one surface in contact with a curved region and another surface in contact with the side surface of the adhesive layer, an optical adhesive material coated to attach a display can be evenly applied onto the curved cover.

Second, by including a wall structure, according to the present invention, which is provided with an inner wall having one surface in contact with the side surface of the adhesive layer, and an outer wall disposed between the inner wall and an edge of the cover, an overflow of the liquid optical adhesive material due to a manufacturing tolerance can be prevented.

Third, by including a wall structure, according to the present invention, which is provided with a protrusion protruding from a surface thereof in contact with the adhesive layer toward a center of the adhesive layer and extending in a direction in which the wall structure extends, a display and a cover can be effectively attached to each other while reducing an amount of an optical adhesive material used during an optical bonding process.

Fourth, by including an exemplary wall structure, which is provided with a venting passage penetrating through a surface of the wall structure in contact with the adhesive layer and an opposite surface to the surface, and having a shape bent at least once, bubbles in an adhered portion of a display can be effectively discharged to outside of the adhered portion during a display attaching process.

The effects of the present disclosure are not limited to those effects mentioned above, and other effects not mentioned may be clearly understood by those skilled in the art from the description of the appended claims.

<FIG> and <FIG> are views illustrating a structure and operation of a display assembly in accordance with one embodiment of the present disclosure. <FIG> are a planar view, a rear view, a side view, an exploded perspective view, a longitudinal sectional view, and a partially enlarged view of a display assembly according to one embodiment of the present disclosure. <FIG> is a partially enlarged view of a part C, with removing a display <NUM> and an adhesive layer <NUM> from the display assembly of <FIG>. <FIG> are a planar view, a right side view, a left side view, and a longitudinal sectional view, respectively, of a side wall structure <NUM> of <FIG>. <FIG> are a planar view, a rear view, a front view, and a left side view, respectively, of a front wall structure <NUM> of <FIG>.

Hereinafter, a display assembly according to the present embodiment will be described with reference to <FIG> and the following drawings.

A display assembly according to an embodiment of the present disclosure includes a cover <NUM> having a curved surface formed to be bent. The display assembly includes a display <NUM> disposed on the curved surface. The display assembly includes an adhesive layer <NUM> disposed between the cover <NUM> and the display <NUM>. The display assembly includes a wall structure <NUM>. The wall structure <NUM> is disposed on the cover <NUM>. The wall structure <NUM> has one surface brought into contact with the curved surface and another surface brought into contact with a side surface of the adhesive layer <NUM>. The wall structure <NUM> extends along the side surface of the adhesive layer <NUM>.

Referring to <FIG>, the cover <NUM> is formed into a substantially rectangular plate shape. The cover <NUM> may be partially or wholly formed to be transparent, semitransparent or opaque. The semitransparent or transparent portion of the cover <NUM> may be provided with an opaque sheet or the like on its upper surface to protect internal members from external light.

The cover <NUM> may be wholly or partially formed of a light-transmitting material. At least part of the cover <NUM> is formed as a light-transmissive portion so that external light can be transmitted to the inside of the cover <NUM>. At least part of the cover <NUM> is formed as a light-transmissive portion so that light emitted from the display <NUM> can be discharged to the outside through the cover <NUM>. When viewed from a bottom of the cover <NUM>, an active area which is a light-emitted portion of the display <NUM> is wider than the light-transmissive portion of the cover <NUM>, so that light emitted from the display <NUM> can be discharged to outside through the cover <NUM>.

The cover <NUM> may be formed to be concave, convex or bent into different shapes when viewed from above. The cover <NUM> is integrally formed so that a bent or curved portion and a flat portion are continuously connected to each other, which may result in obtaining structural rigidity and improving appearance of the cover <NUM>.

The cover <NUM> may be provided with at least one surface formed to be curved or flat. The display assembly may be provided with a plurality of displays <NUM> arranged on the at least one surface.

In one embodiment of the present disclosure, the cover <NUM> is formed in a curved shape which is downwardly convex as a whole. The cover <NUM> is provided with a lower surface <NUM> which is curved to be downwardly convex. The cover <NUM> is provided with an upper surface <NUM> which is curved to be downwardly convex. The upper surface <NUM> of the cover <NUM> is curved to be downwardly concave when viewed from above.

Referring to <FIG> and <FIG>, the upper surface <NUM> of the cover <NUM> includes an adhesion surface which is not curved or bent in a left-right direction and is curved in a front-rear direction. The display <NUM> is attached to the adhesion surface. The cover <NUM> may be formed such that a surface extending from the edge of the attachment surface of the display <NUM> to the edge of the cover <NUM> is inclined downward toward the center of the cover <NUM>.

The cover <NUM> may be provided with a coupling member for coupling the cover <NUM> to a main body to which the cover <NUM> is attached. The coupling member includes at least one of a protrusion, a ring, a bolt coupling portion, and the like. The coupling member may include a coupling ring which is hooked to the main body. The coupling member may include a cover coupling portion that is coupled to the main body in a bolt-nut coupling manner.

The cover <NUM> may be provided with a guide member for guiding a coupling position with the main body to which the cover <NUM> is coupled.

The cover <NUM> may be provided with a cover wall structure on a rear side. The cover wall structure may be connected to side wall structures <NUM> to form a space in which the adhesive layer <NUM> is received. The cover wall structure can prevent a liquid adhesive material from flowing to the rear when adhering the display <NUM>.

The display <NUM> is a curved display. The display <NUM> may be formed in a shape having a constant thickness or having a portion with a different thickness. The display <NUM> may be formed in a circular or polygonal shape. Referring to <FIG>, in this embodiment, the display <NUM> is formed in a rectangular plate shape. The display <NUM> is formed as a plane having a constant thickness. The display <NUM> is provided, at an edge thereof, a portion whose thickness is made thinner than a central portion by a predetermined length.

The embodiment of the present disclosure illustrates an LCD as the display <NUM>, but the present disclosure is not limited to this. The display <NUM> may alternatively be implemented by a different type, such as Light Emitting Diode (LED), Organic Light Emitting Diode (OLED), and the like.

The display <NUM> emits light by itself or by a backlight and performs the function as the display <NUM>. In this embodiment, a backlight (not shown) is disposed on an upper side of the display <NUM>.

The display <NUM> is disposed on an upper side of the cover <NUM>. The display <NUM> is disposed on the upper surface <NUM> of the cover <NUM>. The display <NUM> is attached on the upper surface <NUM> of the cover <NUM>. The display <NUM> is attached on the cover <NUM>. The display <NUM> is attached on the upper surface <NUM> of the cover <NUM> by an adhesive layer <NUM>. The adhesive layer <NUM> is formed by curing a liquid adhesive material.

The display <NUM> is disposed with being spaced apart from the upper surface <NUM> of the cover <NUM> by a predetermined distance. A distance between the display <NUM> and the lowest point of the upper surface <NUM> of the cover <NUM> may vary depending on a curvature of the upper surface <NUM> of the cover <NUM>. The distance between the display <NUM> and the lowest point of the upper surface <NUM> may vary depending on a curvature of the display <NUM>.

The display <NUM> may be attached from one side on the cover top surface <NUM> in a state of being tilted to the one side in the process of being adhered onto the upper surface <NUM> of the cover <NUM>. In this embodiment, the display <NUM> is attached from the front side in a state of being tilted to the front when it is attached on the cover top surface <NUM>. This embodiment is effective in the case where the display <NUM> is attached from the left side in a state of being tilted to the front.

A wall structure <NUM> is disposed in order to prevent the liquid adhesive material from flowing toward edges of the cover <NUM> from a portion, at which the display <NUM> is attached on the cover top surface <NUM>, into other members during attachment of the display <NUM>. The wall structure <NUM> will be described later.

Referring to <FIG> and <FIG>, in an embodiment of the present disclosure, the display <NUM> is disposed so as not to be in contact with other members of the display assembly, such as the cover <NUM> or the wall structure <NUM>, in addition to the adhesive layer <NUM>. In the case where the display <NUM> is disposed in contact with another member having a fixed shape, when there is manufacturing tolerance, a contact surface between the display <NUM> and the another member is not constant, and thereby stress or deformation may occur. The display <NUM> is disposed on the adhesive layer <NUM> to prevent generation of stress or deformation, caused due to a contact with other members. When a distance between the display <NUM> and another member such as the cover <NUM>, the wall structure <NUM> and the like is not constant due to manufacturing tolerances, the adhesive layer <NUM> also acts to buffer it.

In another embodiment of the present disclosure, the display <NUM> is disposed in contact with an upper end of the wall structure <NUM>. The display <NUM> may be bonded or attached on the upper end of the wall structure <NUM> in a placed state. The display <NUM> may be bonded to the cover in a state where the display <NUM> is first coupled with a backlight or the like. At this time, it may be effective that the display <NUM> is disposed in contact with the upper end of the wall structure <NUM> and attached thereto.

A backlight is disposed on an upper side of the display <NUM>. The backlight is attached on a display upper surface <NUM>. The backlight may be an LED backlight or other light source.

A display bottom surface <NUM> may be formed to be flat or curved depending on the type of the display <NUM>. In this embodiment, the display <NUM> is a flat display and the display bottom surface <NUM> is also formed flat. The display bottom surface <NUM> is disposed to be spaced apart from a wall structure protrusion <NUM> by a predetermined distance in a perpendicular direction.

The display bottom surface <NUM> includes an active region and an inactive region. The active region emits light by itself or by a backlight disposed on the display top surface <NUM>.

The display bottom surface <NUM> is disposed with being spaced apart from the cover top surface <NUM> by a predetermined distance. The distance between the display bottom surface <NUM> and the cover top surface <NUM> may vary depending on a curvature of the cover top surface <NUM>.

The active region may be formed to be flat or curved depending on the type of the display <NUM>. In this embodiment, the display <NUM> is a flat display and the active region is also formed flat. The active region emits light by itself or by a backlight disposed on the display top surface <NUM>. The active region performs the function of the display <NUM>. The light emitted from the active region passes through the light-transmissive portion of the cover <NUM> and is discharged outside the cover <NUM>.

The inactive region is disposed around the active region. The inactive region does not emit light. A portion of the cover <NUM> where the inactive region is disposed may be formed opaque so that the inactive region is not visible to the user. The cover <NUM> may be provided with an opaque sheet or the like attached on a portion of the cover top surface <NUM> so that the inactive region is not visible to the user.

A display front surface is disposed adjacent to a front wall structure <NUM>. The display front surface <NUM> is disposed to be spaced apart from the front wall structure <NUM> by a predetermined distance in a perpendicular direction.

A display rear surface is disposed adjacent to a cover rear wall. The display rear surface <NUM> is disposed with being spaced apart from the cover rear wall <NUM> by a predetermined distance.

Both side surfaces <NUM> of the display <NUM> are disposed adjacent the side wall structures <NUM>. The both side surfaces <NUM> of the display <NUM> are spaced apart from the side wall structures <NUM> by predetermined distances in a horizontal direction.

The display <NUM> includes a display control unit <NUM> (see <FIG>). The display control unit <NUM> is disposed on an upper side of the display <NUM>. The display control unit <NUM> controls at least one function of the display <NUM>. The display control unit <NUM> may be connected to a control unit (not shown) of the main body to control the display <NUM>.

The adhesive layer <NUM> is disposed between the display <NUM> and the cover <NUM>. The adhesive layer <NUM> is made of an optical adhesive material. The adhesive layer <NUM> is formed to be transparent so as to allow light emitted from the display <NUM> to pass therethrough. The optical adhesive material is Optical Clear Resin (OCR), Optical Clear Adhesive (OCA), or the like. This embodiment is described based on OCR as an optical adhesive material, but may also be applied to the case of using other materials.

The adhesive layer <NUM> is formed by curing a liquid adhesive material. The adhesive layer <NUM> obtains a shape in a manner that a liquid adhesive material is cured in contact with the cover <NUM>, the wall structure <NUM>, the display <NUM>, and the like. The adhesive layer <NUM> is formed to be transparent so as to allow light emitted from the display <NUM> to pass therethrough. The adhesive layer <NUM> prevents external light coming through the cover <NUM> from being reflected on a contact surface between the adhesive layer <NUM> and the adhesion surface of the display, thereby improving visibility of the display <NUM>.

OCR is applied in a liquid phase, flows along the shapes of the cover, the wall structure and the display, and then is cured. OCR may be applied in a liquid phase and then naturally cured, may be cured by catalysis of ultraviolet rays irradiated, or may be thermally cured, depending on types.

OCR in a general manufacturing process is coated on the cover <NUM> more than a proper amount, in consideration of manufacturing tolerances, in order to prevent a case where the display <NUM> is not fully bonded due to the lack of OCR. There is a need for a method of preventing the OCR from flowing over edges of a surface, to which the display <NUM> is attached on the cover <NUM>, and affecting other members. In the related art, in order to prevent the OCR from flowing over the edges of the surface, to which the display <NUM> is attached on the cover <NUM>, and affecting other members, a method of applying and curing a dam by using a liquid resin or the like has been used. The related art has a problem that the shape of the dam is not uniform on a curved surface. The wall structure <NUM> according to the present disclosure is advantageous in that an accommodation space of the OCR can be constantly maintained even on a curved surface owing to a uniform shape of the wall structure <NUM>.

The adhesive layer <NUM> allows the display <NUM> to adhere onto the cover <NUM>. The adhesive layer <NUM> reduces an amount of light, which is reflected before reaching the display <NUM> after coming into the cover <NUM> through the light-transmissive portion of the cover. The adhesive layer <NUM> may be configured to have a refractive index equivalent to that of the light-transmissive portion of the cover. The adhesive layer <NUM> may be configured to have a refractive index equivalent to that of the display <NUM>. The adhesive layer <NUM> may lower reflectance at an interface with the cover <NUM>. The adhesive layer <NUM> may lower reflectance at a contact surface with the display <NUM>. The adhesive layer <NUM> may improve visibility of the display <NUM>.

The adhesive layer <NUM> is formed as the OCR is cured in a contact state with the display <NUM>, the cover <NUM>, and the wall structure <NUM>. The OCR may be applied in a liquid phase and then naturally cured, may be cured by catalysis of ultraviolet rays irradiated, or may be thermally cured, depending on types. The OCR is applied in a liquid phase and cured in a state flown along a shape of a surface brought into contact with the cover <NUM>, the wall structure <NUM>, the display <NUM>, etc. to form the adhesive layer <NUM>, thereby providing adhesion force (or bonding force).

The adhesive layer <NUM> provides adhesion force to the display <NUM>, the cover <NUM> and the wall structure <NUM>. The adhesive layer <NUM> allows the display <NUM> to be placed in non-contact with other members such as the cover <NUM>, the wall structure <NUM>, and the like. The adhesive layer <NUM> has its shape as a liquid adhesive material is cured in a contact state with the cover <NUM>, the display <NUM>, the wall structure <NUM> and the like.

The thusly-constructed display assembly has an advantage that the display <NUM> is prevented from being stressed or deformed due to manufacturing tolerances. The display assembly has an advantage that durability of the display <NUM> against external impact is improved. The display assembly has an advantage that heat generated in the display <NUM> and transmitted to the cover <NUM> is reduced.

The adhesive layer <NUM> is disposed between the display <NUM> and the cover <NUM>. The adhesive layer <NUM> is disposed between the display <NUM> and the cover top surface <NUM>. The adhesive layer <NUM> has an upper surface brought into contact with the display bottom surface <NUM>. The adhesive layer <NUM> has a lower surface brought into contact with the cover bottom surface <NUM>. The adhesive layer <NUM> has a lower surface brought into contact with a touch sensing portion <NUM> when the touch sensing portion <NUM> is further disposed.

The adhesive layer <NUM> has a side surface brought into contact with the wall structure <NUM>. The adhesive layer <NUM> is brought into contact with a protrusion <NUM> of the wall structure <NUM>. The protrusion <NUM> of the wall structure <NUM> can increase a contact area between the wall structure <NUM> and the adhesive layer <NUM>, thereby enhancing durability of the adhesive layer <NUM> against external impact.

The adhesive layer <NUM> may also be brought into contact with an adhered portion between the wall structure <NUM> and the cover <NUM>. Therefore, a material that does not cause inhibition of OCR curing is preferably used as the adhesive material for bonding the wall structure <NUM> and the cover <NUM> to each other.

The adhesive layer <NUM> is brought into close contact with the cover <NUM> and the touch sensing portion <NUM> and bonded thereto when the touch sensing portion <NUM> is disposed, thereby improving adhesive force of the cover <NUM> and the touch sensing portion <NUM>.

The display assembly may further include a touch sensing portion <NUM>. The touch sensing portion <NUM> is formed such that a contact surface with the cover <NUM> is formed curved or flat to correspond to the shape of the cover top surface <NUM>. The touch sensing portion <NUM> senses the touch of the user. The touch sensing portion <NUM> can be of a contact sensing type, such as an electrostatic type or a piezoelectric type. In this embodiment, the touch sensing portion <NUM> is formed in a shape of a rectangular plate having a constant thickness. The touch sensing portion <NUM> is configured to be transparent. The touch sensing portion <NUM> is disposed between the cover top surface <NUM> and the adhesive layer <NUM> and is attached thereto.

Referring to <FIG>, <FIG> and <FIG> to <NUM>, the wall structure <NUM> is formed in a bar-like shape extending along the side surface of the display <NUM>. The wall structure <NUM> extends on the cover top surface <NUM>. The wall structure <NUM> may be formed of a transparent or opaque material.

Hereinafter, a direction toward a center of the cover <NUM> is defined as "inner side" and a direction toward an edge of the cover <NUM> is defined as "outer side" with respect to the wall structure <NUM> as a reference.

The wall structure <NUM> includes wall structure inner walls <NUM> and <NUM>, wall structure outer walls <NUM> and <NUM>, wall structure connecting walls <NUM> and <NUM> and wall structure connecting ribs <NUM> and <NUM>. The wall structure <NUM> has a cross-section in a cup shape when a width direction is cut vertically. The wall structure <NUM> includes wall structure outer walls <NUM> and <NUM> disposed between the wall structure inner walls <NUM> and <NUM> and a cover edge. The wall structure <NUM> is formed as the wall structure inner walls <NUM> and <NUM> and the wall structure outer walls <NUM> and <NUM> are spaced by a predetermined distance. The wall structure <NUM> includes an inner space defined by the wall structure inner walls <NUM> and <NUM> and wall structure outer walls <NUM> and <NUM> and the wall structure connecting walls <NUM> and <NUM>.

The wall structure <NUM> may be configured by a plurality of parts. The wall structure <NUM> may have all or part of a plurality of parts integrally formed with the cover <NUM>. In this embodiment, the wall structure <NUM> is configured by three parts including a pair of side wall structures <NUM> and a front wall structure <NUM>. The cover <NUM> has a cover rear wall <NUM> formed on a lower side thereof. The cover rear wall <NUM> has a wall surface which is in contact with the adhesive layer <NUM>. The pair of side wall structures <NUM> and the cover rear wall <NUM> are connected to form a space in which the adhesive layer <NUM> is accommodated.

The pair of side wall structures <NUM> and the front wall structure <NUM> are disposed on the cover <NUM>. The pair of side wall structures <NUM> and the front wall structure <NUM> are attached on the cover top surface <NUM>. The adhesive layer <NUM> may also be brought into contact with an adhered portion between the wall structure <NUM> and the cover <NUM>. Therefore, a material that does not cause inhibition of OCR curing is preferably used as the adhesive material for bonding the wall structure <NUM> and the cover <NUM> to each other.

Referring to <FIG> and <FIG>, the pair of side wall structures <NUM> are provided with a side wall structure coupling protrusion <NUM> protruding from an upper end thereof toward the front wall structure <NUM>. The side wall structure coupling protrusion <NUM> forms a <NUM>-degree angle with the side wall structure <NUM>. The front wall structure <NUM> is provided with front wall structure coupling protrusions <NUM> formed on both ends thereof to correspond to the side wall structure coupling protrusions <NUM> of the side walls <NUM>. In the plurality of wall structures <NUM> constructed as described above, such coupling portions are formed in a staggered (or zig-zag) coupling structure.

The wall structure <NUM> is provided with a wall structure protrusion <NUM> formed on an inner surface of the side wall structure <NUM>. The wall structure protrusion <NUM> is disposed such that an upper end thereof forms an upper gap g1 from the display bottom surface <NUM>. The wall structure protrusion <NUM> will be described in detail below.

The wall structure <NUM> includes a venting passage. The venting passage employs a staggered structure, so that air is discharged through the venting passage and the OCR does not flow into the venting passage during adhesion of the display <NUM>. The venting passage penetrates through a surface of the wall structure <NUM>, which is in contact with the adhesive layer, and an opposite surface of the surface. The venting passage penetrates through the wall structure inner walls <NUM> and <NUM> and the wall structure outer walls <NUM> and <NUM>. The venting passage penetrates through an inner surface of the wall structure inner wall <NUM>, <NUM> and an outer surface of the wall structure outer wall <NUM>, <NUM>. The wall structure <NUM> is formed such that the venting flow path <NUM> has a shape bent at least once. The wall structure <NUM> may have the venting passage which is partially connected and partially separated when viewed in an up-down direction.

The venting passage may be formed in coupling portions of the plurality of wall structures <NUM>. Referring to <FIG>, in this embodiment, the venting passage is formed at the coupling portion between the side wall structure <NUM> and the front wall structure <NUM>.

The coupling portion of the plurality of wall structures <NUM> is formed in the staggered coupling structure as described above, and is adhered on the cover <NUM> while maintaining a predetermined gap, thereby forming the venting passage. In this manner, the wall structure <NUM> can prevent the OCR from leaking to the outside of the wall structure <NUM> while discharging air to the outside of the wall structure <NUM> through the venting passage when the display <NUM> is attached. The gap of the venting passage is set in consideration of tolerance of an assembly zig. The gap of the venting passage is set in consideration of viscosity of OCR.

The coupling portion of the plurality of wall structures <NUM> may form the venting passage in a manner that the plurality of wall structures <NUM> are partially connected and partially separated.

With the configuration of the display assembly, the OCR is not leaked to outside of the wall structure <NUM> while discharging air to outside of the wall structure <NUM> through the venting passage during attachment of the display <NUM>, which may result in effective bonding of the display <NUM>.

The display assembly has an advantage in that air is effectively discharged through the venting passage during attachment of the display <NUM>, by forming the venting passage in a corner portion where the coupling portion of the plurality of wall structures <NUM> is disposed.

The wall structure <NUM> is in contact with the side surface of the adhesive layer <NUM>, and thus the side surface of the adhesive layer <NUM> is uniformly formed. The wall structure <NUM> prevents an introduction of OCR into other members, thereby lowering a defect rate of the display assembly.

The wall structure <NUM> accommodates the OCR, which flows over the wall structure inner walls <NUM> and <NUM>, in the inner space of the wall structure <NUM> during the attachment of the display <NUM> so as to prevent the OCR from flowing into other members, and eliminates a process of washing out the OCR flowing over the adhered portion of the display <NUM> so as to simplify processes.

In the related art, in order to prevent OCR from flowing over edges of a surface, to which the display <NUM> is attached on the cover <NUM> and affecting other members, a method of forming a dam by applying and curing a liquid resin has been used. In the related art, the shape of the dam is not constant on a curved surface depending on the shape of the curved surface. As a result, adhesive resin is not uniformly applied to the inside of the dam, which causes unstable quality of the display assembly. On the other hand, the wall structure <NUM> has a uniform shape and has the OCR evenly applied therein, thereby improving the quality of the display assembly.

The wall structure <NUM> is provided with the wall structure protrusion <NUM> to increase the contact area with the adhesive layer <NUM>, which may result in improving durability of the adhesive layer <NUM> against external impact.

The wall structure <NUM> is disposed such that a predetermined gap is formed between the wall structure inner walls <NUM> and <NUM> and the side surfaces of the display <NUM> in a horizontal direction, thereby preventing generation of bubbles in a liquid adhesive member by an air-vent function while discharging air between the display <NUM> and the cover <NUM> to the outside when attaching the display <NUM>. The wall structure inner walls <NUM> and <NUM> will be described in detail below.

The wall structure <NUM> is disposed on a path through which external light entering the inside of the cover <NUM> through the light-transmissive portion of the cover <NUM> moves to other members except for the display assembly, so as to reduce or block influence of the external light. The wall structure <NUM> has improved appearance because it covers other members when the user views the display <NUM> at an oblique angle.

The wall structure <NUM> is disposed on the cover <NUM>. The wall structure <NUM> is attached on the cover top surface <NUM>. An inner surface of the wall structure <NUM> is in contact with the side surface of the adhesive layer <NUM>. A lower surface of the wall structure <NUM> is brought into contact with the cover top surface <NUM>. The wall structure <NUM> extends while its inner surface is in contact with the side surface of the adhesive layer <NUM> and its lower surface is in contact with the cover top surface <NUM>. The wall structure <NUM> extends along the side surface of the adhesive layer <NUM>. The wall structure <NUM> is disposed side by side with the surfaces <NUM>, <NUM> and <NUM> of the display <NUM>.

The wall structure <NUM> is attached to the cover top surface <NUM> using an adhesive or the like. The adhesive layer <NUM> may also be brought into contact with an adhered portion between the wall structure <NUM> and the cover <NUM>. Therefore, a material that does not cause inhibition of OCR curing is preferably used as the adhesive material for bonding the wall structure <NUM> and the cover <NUM> to each other.

The wall structure <NUM> is disposed such that its upper end is lower than the display top surface <NUM> and higher than the display bottom surface <NUM>. The wall structure <NUM> has an upper end disposed between the top and bottom surfaces of the display.

The wall structure <NUM> may be disposed so that the upper end thereof is perpendicularly closer to the display top surface <NUM> than to the display bottom surface <NUM>. The thusly-constructed display assembly has an advantage that its appearance is improved as the wall structure <NUM> obscures other members inside the cover <NUM> when the user views the display <NUM> at an oblique angle.

The wall structure <NUM> may be formed to be fit into a pre-formed structure of the cover <NUM>.

The pair of side wall structures <NUM> are formed in a plane symmetrical shape. The pair of side wall structures <NUM> are formed in a bar-like shape extending in a front-rear direction. The pair of side wall structures <NUM> are formed in a bar-like shape extending along the side surfaces <NUM>, <NUM> and <NUM> of the display <NUM>.

The pair of side wall structures <NUM> are provided with a side wall structure coupling protrusion <NUM> protruding from its upper end toward the front wall structure <NUM>. The side wall structure coupling protrusion <NUM> forms a <NUM>-degree angle with the side wall structure <NUM>. The front wall structure <NUM> is provided with front wall structure coupling protrusions <NUM> formed on both ends thereof to correspond to the side wall structure coupling protrusions <NUM> of the side wall structures <NUM>. The thusly-constructed plurality of wall structures <NUM> has a coupling portion in a zig-zag (staggered) coupling structure in which the side wall structure coupling protrusion <NUM> and the wall structure coupling protrusion <NUM> are engaged with each other in the zig-zag form.

The plurality of wall structures <NUM> are provided with a venting passage in the coupling portion. The coupling portion between the plurality of wall structures <NUM> is formed in the zig-zag (staggered) coupling structure as described above, and is adhered on the cover <NUM> while maintaining a predetermined gap, thereby forming the venting passage. In this manner, the wall structure <NUM> can prevent the OCR from leaking to the outside of the wall structure <NUM> while discharging air to the outside of the wall structure <NUM> through the venting passage when the display <NUM> is attached.

Each of the pair of side wall structures <NUM> includes a side wall structure inner wall <NUM>. The side wall structure <NUM> includes a side wall structure outer wall <NUM>. The side wall structure <NUM> includes a side wall structure connecting wall <NUM>. The side wall structure <NUM> includes a side wall structure connecting rib <NUM>.

The side wall structure inner wall <NUM> is formed in a bar-like shape extending along the side surfaces <NUM>, <NUM> and <NUM> of the display <NUM>. The side wall structure inner wall <NUM> is formed to have a constant thickness. The side wall structure inner wall <NUM> may be formed such that its lower side is thicker than its upper side to reinforce rigidity.

The side wall structure inner wall <NUM> is formed such that its upper surface is flat. The side wall structure inner wall <NUM> has a rounded top corner so that the liquid OCR flows toward the wall structure <NUM> without flowing toward the display top surface <NUM> when the liquid OCR overflows during the adhesion of the display <NUM>.

The side wall structure inner wall <NUM> is connected to the side wall structure outer wall <NUM> by the side wall structure connecting wall <NUM> and the side wall structure connecting rib <NUM>. The lower end of the side wall structure inner wall <NUM> is connected to the lower end of the side wall structure outer wall <NUM> by the side wall structure connecting wall <NUM>. The side wall structure inner wall <NUM> forms an inner space of the side wall structure together with the side wall structure outer wall <NUM> and the side wall structure connecting wall <NUM>.

The side wall structure inner wall <NUM> is disposed such that its upper end is lower than the display top surface <NUM> and higher than the display bottom surface <NUM>. The side wall structure <NUM> has an upper end disposed between the display top surface <NUM> and the display bottom surface <NUM>.

The side wall structure <NUM> may be disposed so that the upper end thereof is perpendicularly closer to the display top surface <NUM> than to the display bottom surface <NUM>. The thusly-constructed display assembly has an advantage that its appearance is improved as the wall structure <NUM> obscures other members inside the cover <NUM> when the user views the display <NUM> at an oblique angle.

The side wall structure outer wall <NUM> may be formed in a bar-like shape extending along the side surfaces <NUM>, <NUM> and <NUM> of the display <NUM> and may have substantially the same shape as the side wall structure inner wall <NUM>. The side wall structure outer wall <NUM> is formed to have a predetermined thickness. The side wall structure outer wall <NUM> may be formed such that its lower side is thicker than its upper side to reinforce rigidity.

The side wall structure outer wall <NUM> is formed such that the upper surface is flat.

The side wall structure outer wall <NUM> is connected to the side wall structure inner wall <NUM> by the side wall structure connecting wall <NUM> and the side wall structure connecting rib <NUM>. The lower end of the side wall structure outer wall <NUM> is connected to the lower end of the side wall structure inner wall <NUM> by the side wall structure connecting wall <NUM>. The side wall structure outer wall <NUM> forms an inner space of the side wall structure together with the side wall structure inner wall <NUM> and the side wall structure connecting wall <NUM>.

The side wall structure outer wall <NUM> may be formed such that its upper end is lower than the side wall structure inner wall <NUM>. The side wall structure outer wall <NUM> may be formed to have a height in inverse proportion to a distance between the side wall structure inner wall <NUM> and the side wall structure outer wall <NUM> and may be formed to maintain a volume of the inner space of the side wall structure <NUM>.

A lower surface of the side wall structure connecting wall <NUM> is brought into contact with the cover top surface <NUM>. The side wall structure connecting wall <NUM> is formed to be curved in correspondence with the curvature of the cover top surface <NUM> so that the lower surface thereof is in contact with the cover top surface <NUM>. The side wall structure connecting wall <NUM> is attached to the cover top surface <NUM> using an adhesive or the like. The adhesive layer <NUM> may also be brought into contact with an adhered portion between the wall structure <NUM> and the cover <NUM>. Therefore, a material that does not cause inhibition of OCR curing is preferably used as the adhesive material for bonding the side wall structure connecting wall <NUM> and the cover <NUM> to each other.

The side wall structure connecting wall <NUM> is formed in a bar-like shape extending in a direction in which the side wall structure inner wall <NUM> and the side wall structure outer wall <NUM> extend. The side wall structure connecting wall <NUM> connects the lower end of the side wall structure inner wall <NUM> and the lower end of the side wall structure outer wall <NUM>.

The side wall structure connecting wall <NUM> forms an inner space of the side wall structure <NUM> together with the side wall structure inner wall <NUM> and the side wall structure outer wall <NUM>. In another embodiment of the present disclosure, the side wall structure <NUM> does not include the side wall structure connecting wall <NUM>. In this case, the cover top surface <NUM> forms the inner space of the side wall structure <NUM>, instead of the connecting wall, together with the side wall structure inner wall <NUM> and the side wall structure outer wall <NUM>. The side wall structure inner wall <NUM> and the side wall structure outer wall <NUM> may be connected by ribs.

Side wall structure connecting ribs <NUM> are formed to have a predetermined thickness. The side wall structure connecting ribs <NUM> connect the side wall structure inner wall <NUM> and the side wall structure outer wall <NUM>. The side wall structure connecting ribs <NUM> are arranged such that a plurality of ribs in a low height portion of the side wall structure <NUM> are arranged closer to one another than a plurality of ribs in a high height portion, thereby reinforcing rigidity of the side wall structure <NUM>.

The side wall structure connecting ribs <NUM> may be formed such that an upper surface thereof is formed flat to connect the upper end of the side wall structure inner wall <NUM> and the upper end of the outer wall <NUM>. The side wall structure connecting ribs <NUM> may be formed such that the upper surface thereof has the same height as the upper end of the side wall structure inner wall <NUM>. The side wall structure connecting ribs <NUM> may be formed to have a portion, which has the same height as the upper end of the side wall structure inner wall <NUM>, and to be downwardly inclined.

The side wall structure <NUM> includes a wall structure protrusion <NUM>. The side wall structure <NUM> is provided with the wall structure protrusion <NUM> on the inner surface thereof in contact with the adhesive layer <NUM>. The wall structure protrusion <NUM> protrudes toward the center of the adhesive layer <NUM>. The wall structure protrusion <NUM> extends in a direction in which the side wall structure <NUM> extends.

The wall structure protrusion <NUM> has a rectangular cross section. The wall structure protrusion <NUM> is formed such that its upper surface corresponds to the display bottom surface. In this embodiment, the display <NUM> has the display bottom surface <NUM> in the flat shape, and the wall structure protrusion <NUM> also has an upper surface in the flat shape.

The wall structure protrusion <NUM> has a lower surface which is curved to correspond to a curved lower surface of the side wall structure connecting wall <NUM>. The wall structure protrusion <NUM> is formed higher than the lower surface of the side wall structure connecting wall <NUM> by a predetermined length, but is not limited thereto. The wall structure protrusion <NUM> may alternatively be formed to be connected to the lower surface of the side wall structure connecting wall <NUM>. The side wall structure <NUM> may be configured such that the side wall structure connecting wall <NUM> and the lower surface of the wall structure protrusion <NUM> are brought into contact with the cover top surface <NUM>.

The wall structure protrusion <NUM> may have a lower surface which is formed straight to be positioned at a predetermined distance from the upper end of the side wall structure inner wall <NUM>, irrespective of the shape of the lower surface of the side wall structure connecting wall <NUM>.

The wall structure protrusion <NUM> is formed to be spaced apart from one end of the side wall structure <NUM> by a predetermined distance. The wall structure protrusion <NUM> is formed to be spaced apart from a front end of the side wall structure <NUM> by a predetermined distance. The wall structure protrusion <NUM> is formed to be spaced apart from a rear end of the side wall structure <NUM> by a predetermined distance. The wall structure protrusion <NUM> is formed to be spaced apart from the coupling portion between the side wall structure <NUM> and the front wall structure <NUM> by a predetermined distance. The wall structure protrusion <NUM> is formed to be spaced apart in a horizontal direction from a corner, at which the upper surface and a left surface of the display meet, by a predetermined distance.

In some cases, the display <NUM> is attached in a state of being tilted to one side for effective attachment during a manufacturing process of attaching the display <NUM> to the cover <NUM>. The wall structure protrusion <NUM> constructed as described above allows the OCR of the liquid phase to smoothly flow in a front-rear direction that the wall structure protrusion extends when the display is attached with being tilted to the front, which may provide an advantage of reducing the liquid OCR flowing over the side wall structure inner wall <NUM>.

The wall structure protrusion <NUM> allows the OCR of the liquid phase to be effectively coated on the cover top surface <NUM> to which the display <NUM> is attached, so that the display <NUM> can be effectively attached to the cover <NUM>.

The wall structure protrusion <NUM> is advantageously formed easier than a protrusion formed from an end of the side wall structure <NUM> in the front-rear direction in a manufacturing process.

The wall structure protrusion <NUM> is formed such that its end is inclined by a predetermined angle toward the center of the protrusion when viewed from above. The wall structure protrusion <NUM> is formed in a trapezoidal shape when viewed from above. The wall structure protrusion <NUM> may have a rounded edge. The thusly-constructed wall structure protrusion <NUM> can allow the OCR of the liquid phase to smoothly flow along the side wall structure <NUM>, so that the display <NUM> can be effectively adhered to the cover <NUM>.

The wall structure protrusion <NUM> may be provided with a plurality of protruding portions. The wall structure protrusion <NUM> may be provided with a plurality of protruding portions on each of the side wall structures <NUM>. The wall structure protrusion <NUM> may be provided with a plurality of protruding portions spaced apart from each other at a predetermined interval in the front-rear direction when viewed from above. The wall structure protrusion <NUM> may be provided with a plurality of protruding portions spaced apart from each other at a predetermined interval in an up-down direction when viewing the side wall structure <NUM> from inside.

The wall structure protrusion <NUM> can increase a contact area between the side wall structure <NUM> and the adhesive layer <NUM>, thereby improving durability of the adhesive layer <NUM> against external impact and vibration.

The wall structure protrusion <NUM> has an advantage of reducing an amount of expensive OCR used to form the adhesive layer <NUM>.

The wall structure protrusion <NUM> is disposed such that an upper end thereof forms an upper gap gap1 from the bottom surface of the display <NUM>. The upper gap gap1 is set in consideration of tolerance of an assembly zig. The upper gap gap1 is set in consideration of viscosity of the liquid OCR. The display <NUM> has the bottom surface forming the upper gap gap1 with the upper end of the wall structure protrusion <NUM>, and is adhered on the cover <NUM>.

The wall structure protrusion <NUM> configured as described above allows air between the cover <NUM> and the display <NUM> to be discharged to the outside and prevents the liquid OCR from flowing to the outside through the upper gap gap1 when the display <NUM> is attached, so that the display <NUM> can be effectively adhered to the cover <NUM>.

The wall structure protrusion <NUM> has an inner end located outside rather than the active region of the display <NUM>. The wall structure protrusion <NUM> may have an inner end located outside rather than the light-transmissive portion of the cover, so that light emitted from the display <NUM> can be effectively emitted to the outside through the light-transmissive portion of the cover. The wall structure protrusion <NUM> may cause light emitted from the display <NUM> to go outside through the light-transmissive portion of the cover without being interfered with the wall structure protrusion <NUM>.

The wall structure protrusion <NUM> may be disposed such that an inner end thereof is spaced apart horizontally from the active region of the display <NUM> by a predetermined distance. The wall structure protrusion <NUM> may be disposed such that the inner end thereof is spaced apart horizontally from the light-transmissive portion of the cover by a predetermined distance. The wall structure protrusion <NUM> having the above-described structure can make the user to see the display <NUM> well even when the user views the bottom surface of the cover <NUM> at an oblique angle. The wall structure protrusion <NUM> can prevent the user from feeling a sense of difference even when the user views the cover bottom surface at an oblique angle.

Referring to <FIG>, a part of the display <NUM> is disposed on a straight line which connects an inner edge of the upper end of the wall structure protrusion <NUM> and an inner edge of the upper end of the side wall structure inner wall <NUM>. The side wall structure <NUM> having such a structure is advantageous in protecting other members disposed on the cover <NUM> or inside the main body <NUM> to which the cover <NUM> is attached from external direct ray of light. The side wall structure <NUM> is advantageous in preventing members disposed on the cover or inside the main body to which the cover <NUM> is attached from being visible by the user, thereby improving appearance.

The wall structure <NUM> includes a front wall structure <NUM>. The front wall structure <NUM> is formed in a bar-like shape extending in a left-right direction. The front wall structure <NUM> extends to the left and right. The front wall structure <NUM> is formed in a bar-like shape extending along the side surfaces of the display <NUM>. The front wall structure <NUM> is formed such that its lower surface is in contact with the cover top surface <NUM>. In this embodiment, the cover top surface <NUM> is formed such that an adhesion surface to which the display <NUM> is attached is formed in a shape which is not curved in the left-right direction, and the front wall structure <NUM> is formed such that the lower surface is flat to correspond to the cover top surface <NUM>.

The front wall structure <NUM> is provided with front wall structure coupling protrusions <NUM> protruding from both left and right ends toward the side wall structure <NUM>. The front wall structure <NUM> is provided with front wall structure coupling protrusions <NUM> formed to correspond to the side wall structure coupling protrusions <NUM>. The front wall structure coupling protrusions <NUM> form a <NUM>-degree angle with the front wall structure <NUM>. The thusly-constructed plurality of wall structures <NUM> has a coupling portion in a zig-zag coupling structure in which the side wall structure coupling protrusion <NUM> and the wall structure coupling protrusion <NUM> are engaged with each other in a zig-zag form.

The front wall structure <NUM> includes a front wall structure inner wall <NUM>. The front wall structure <NUM> includes a front wall structure outer wall <NUM>. The front wall structure <NUM> includes a front wall structure connecting wall <NUM>. The front wall structure <NUM> includes front wall structure connecting ribs <NUM>.

The front wall structure <NUM> is formed such that its inner surface is inclined outward by a predetermined angle, so that the liquid OCR can smoothly flow when the display <NUM> is attached.

The front wall structure inner wall <NUM> is formed in a bar-like shape extending along the side surfaces <NUM>, <NUM> and <NUM> of the display <NUM>. The front wall structure inner wall <NUM> is formed to have a constant thickness. The front wall structure inner wall <NUM> may be formed such that its lower side is thicker than its upper side to reinforce rigidity.

The front wall structure inner wall <NUM> is formed such that its upper surface is flat. The front wall structure inner wall <NUM> has a rounded top edge so that the liquid OCR flows toward the wall structure <NUM> without flowing toward the display top surface <NUM> when the liquid OCR overflows during the adhesion of the display <NUM>.

The front wall structure inner wall <NUM> is connected to the front wall structure outer wall <NUM> by the front wall structure connecting wall <NUM> and the front wall structure connecting rib <NUM>. The lower end of the front wall structure inner wall <NUM> is connected to the lower end of the front wall structure outer wall <NUM> by the front wall structure connecting wall <NUM>. The front wall structure inner wall <NUM> forms an inner space of the front wall structure together with the front wall structure outer wall <NUM> and the front wall structure connecting wall <NUM>.

The front wall structure inner wall <NUM> is formed such that its inner surface is inclined outward by a predetermined angle, so that the liquid OCR can smoothly flow when the display <NUM> is attached.

The front wall structure inner wall <NUM> is disposed such that its upper end is lower than the display top surface <NUM> and higher than the display bottom surface <NUM>. The front wall structure <NUM> has an upper end disposed between the display top surface <NUM> and the display bottom surface <NUM>.

The front wall structure inner wall <NUM> may be disposed so that the upper end thereof is perpendicularly closer to the display top surface <NUM> than to the display bottom surface <NUM>. The thusly-constructed display assembly has an advantage that its appearance is improved as the wall structure <NUM> obscures other members inside the cover <NUM> when the user views the display <NUM> at an oblique angle.

The front wall structure outer wall <NUM> may be formed in a bar-like shape elongated along the side surfaces of the display <NUM> and may be formed in the same or similar shape as the front wall structure inner wall <NUM>. The front wall structure outer wall <NUM> is formed to have a predetermined thickness. The front wall structure outer wall <NUM> may be formed such that its lower side is thicker than its upper side to reinforce rigidity.

The front wall structure outer wall <NUM> is formed such that its upper surface is flat.

The front wall structure outer wall <NUM> is connected to the front wall structure inner wall <NUM> by the front wall structure connecting wall <NUM> and the front wall structure connecting rib <NUM>. The lower end of the front wall structure outer wall <NUM> is connected to the lower end of the front wall structure inner wall <NUM> by the front wall structure connecting wall <NUM>. The front wall structure outer wall <NUM> forms an inner space of the front wall structure together with the front wall structure inner wall <NUM> and the front wall structure connecting wall <NUM>.

The front wall structure outer wall <NUM> may be formed such that its upper end is lower than the front wall structure inner wall <NUM>. The front wall structure outer wall <NUM> may be formed to have a height in inverse proportion to a distance between the front wall structure inner wall <NUM> and the front wall structure outer wall <NUM> and may be formed to maintain a volume of the inner space of the front wall structure <NUM>.

A lower surface of the front wall structure connecting wall <NUM> is brought into contact with the cover top surface <NUM>. The front wall structure connecting wall <NUM> is formed to correspond to the shape of the cover top surface <NUM> so that the lower surface thereof is in contact with the cover top surface <NUM>. In this embodiment, the cover top surface <NUM> is formed such that an adhesion surface to which the display <NUM> is attached is formed in a shape which is not curved in a left-right direction, and the front wall structure connecting wall <NUM> is formed such that the lower surface is flat to correspond to the cover top surface <NUM>.

The front wall structure connecting wall <NUM> is attached to the cover top surface <NUM> using an adhesive or the like. The adhesive layer <NUM> may also be brought into contact with an adhered portion between the wall structure <NUM> and the cover <NUM>. Therefore, a material that does not cause inhibition of OCR curing is preferably used as the adhesive material for bonding the front wall structure connecting wall <NUM> and the cover <NUM> to each other.

The front wall structure connecting wall <NUM> is formed in a bar-like shape extending in a direction in which the front wall structure inner wall <NUM> and the front wall structure outer wall <NUM> extend. The front wall structure connecting wall <NUM> connects the lower end of the front wall structure inner wall <NUM> and the lower end of the front wall structure outer wall <NUM>.

The front wall structure connecting wall <NUM> forms an inner space of the front wall structure <NUM> together with the front wall structure inner wall <NUM> and the front wall structure outer wall <NUM>. In another embodiment of the present disclosure, the front wall structure <NUM> does not include the front wall structure connecting wall <NUM>. In this case, the cover top surface <NUM> forms the inner space of the front wall structure <NUM>, instead of the connecting wall, together with the front wall structure inner wall <NUM> and the front wall structure outer wall <NUM>. The front wall structure inner wall <NUM> and the front wall structure outer wall <NUM> may be connected by ribs.

The front wall structure connecting ribs <NUM> are formed to have a predetermined thickness. The front wall structure connecting ribs <NUM> connect the front wall structure inner wall <NUM> and the front wall structure outer wall <NUM>. The front wall structure connecting ribs <NUM> are arranged such that a plurality of ribs in a low height portion of the front wall structure <NUM> are arranged closer to one another than a plurality of ribs in a high height portion, thereby reinforcing rigidity of the front wall structure <NUM>.

Claim 1:
A display assembly comprising:
a cover (<NUM>) having a curved surface formed to be bent;
a display (<NUM>) disposed on the curved surface of the cover (<NUM>);
an adhesive layer (<NUM>) disposed between the cover (<NUM>) and the display (<NUM>); and
a wall structure (<NUM>) disposed on the cover (<NUM>), and extending along a side surface of the adhesive layer (<NUM>) while one surface thereof is in contact with the curved surface of the cover (<NUM>) and another surface is in contact with the side surface of the adhesive layer (<NUM>),
characterized in that the wall structure (<NUM>) comprises:
an inner wall (<NUM>, <NUM>) having one surface in contact with the side surface of the adhesive layer (<NUM>);
an outer wall (<NUM>, <NUM>) disposed between the inner wall (<NUM>, <NUM>) and an edge of the cover (<NUM>); and
a connecting wall (<NUM>, <NUM>) connecting the inner wall (<NUM>, <NUM>) and the outer wall (<NUM>, <NUM>), and
in that an inner space is defined by the inner wall (<NUM>, <NUM>), the outer wall (<NUM>, <NUM>) and the connecting wall (<NUM>, <NUM>),
wherein the wall structure (<NUM>) is provided with a protrusion (<NUM>) protruding toward a center of the adhesive layer (<NUM>) from a surface of the inner wall (<NUM>, <NUM>) and is in contact with the adhesive layer (<NUM>), and
wherein the protrusion (<NUM>) is disposed such that an upper end thereof forms an upper gap (gap1) from a bottom surface of the display (<NUM>).