KR20180076419A - Bended display device and manufacturing method thereof - Google Patents

Abstract

The present invention provides a bended display device including a window having a curved surface part which is bent at an obtuse angle or more, and a manufacturing method thereof. The bended display device comprises: a display panel; and the window located on the display panel, and including a flat surface part and the curved surface part of an edge of the flat surface part. An angle between the longitudinal surface of the flat surface part and the longitudinal surface of the curved surface part is the obtuse angle.

Description

BENDED DISPLAY APPARATUS AND MANUFACTURING METHOD THEREOF FIELD OF THE INVENTION [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bent display device and a method of manufacturing the same, and more particularly, to a bent display device including a flat portion and a curved portion at the edge of a flat portion and a method of manufacturing the same.

Recently flexible display panels that can be bent are being developed. Such a flexible display panel can be used in various fields since it can be used in a folded or curved form.

Organic light emitting devices (OLED), liquid crystal display (LCD) devices, and electrophoretic display (EPD) devices can be applied to the flexible display panel. Among these organic electroluminescent devices, organic electroluminescent devices can be manufactured in a thin film-like laminated structure, and thus have excellent flexibility and are attracting attention as display devices of flexible display panels.

Recently, research and development of a bent display device in which a flexible display panel is applied to a portable terminal or the like is being carried out. The flexible display device refers to a display device capable of bending and spreading freely, and the bent display device is a display device in which the bent shape is maintained.

The bent display device bends the edge of the flexible display panel so that an image can be displayed on the side of the flexible display panel and a touch sensor or the like is disposed on the edge of the flexible display panel so that the touch operation can be performed on the side surface.

The bent display device may include a window disposed on the flexible display panel, and the window may include a flat portion and a curved portion of the flat portion edge, such as a flexible display panel.

In recent years, it is necessary to fabricate a window having a curved surface section curved at an obtuse angle or more in accordance with a design requirement of a bent display apparatus.

Accordingly, it is an object of the present invention to provide a bent display device including a window having a curved surface portion curved at an obtuse angle or more and a method of manufacturing the same.

A display device comprising: a display panel; and a window disposed on the display panel, the window including a planar portion and a curved portion of the planar edge, wherein the angle between the longitudinal plane of the planar portion and the longitudinal plane of the curved portion is an obtuse angle to provide.

The angle between the longitudinal plane of the plane portion and the longitudinal plane of the curved portion may be between 120 and 180 degrees.

The cross-section of the curved portion may be part of an arc.

The cross-section of the curved portion may be part of an ellipse.

The curved surface portion may include at least two or more portions disposed adjacent to each other in a direction perpendicular to the direction of bending.

The curved surface portion may include a first curved surface portion disposed at an outermost portion of the window, and a second curved surface portion disposed between the planar portion and the first curved surface portion.

The display panel may have substantially the same shape as the window.

The display panel may be an organic light emitting display panel.

And a touch sensor disposed between the display panel and the window.

And a touch sensor formed inside the display panel.

A step of bending the edge of the window material to form a flat surface portion and a first curved surface portion; bending the edge of the flat surface portion adjacent to the first curved surface portion to bend the flat surface portion and the first curved surface portion, Forming a second curved portion between the first curved portion and the second curved portion, wherein the first curved portion has an obtuse angle or more from the flat portion.

The first curved surface portion may have an angle of 120 to 180 degrees with respect to the flat surface portion.

The forming of the first curved portion may include bending the edge of the window material at an angle of 45 to 90 degrees.

The forming of the second curved portion may include bending the edge of the flat portion adjacent to the first curved portion at an angle of 45 to 90 degrees.

The forming of the first curved portion may include disposing the window material in the first molding apparatus and forming the first curved portion using the first molding apparatus.

The step of forming the second curved portion may include a step of disposing the window material having the first curved portion formed thereon in the second molding apparatus and forming the second curved portion using the second molding apparatus .

The second molding apparatus may have an escape structure for housing the first curved surface portion.

The bent display apparatus and the method of manufacturing the same according to the present invention can provide a window having a curved surface section bent at an obtuse angle or more.

1 is an exploded perspective view of a bent display device according to an embodiment of the present invention.
2 is a cross-sectional view of a bent display device according to an embodiment of the present invention.
3 is a cross-sectional view of a bent display device according to another embodiment of the present invention.
4 is a partially enlarged view of a part of a display panel according to an embodiment of the present invention.
5 is a cross-sectional view taken along line I-I 'of FIG.
6A to 6C are cross-sectional views illustrating a method of manufacturing a bent display device according to an embodiment of the present invention.
7A to 7D are cross-sectional views illustrating a method of manufacturing a bent display device according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

While the present invention has been described in connection with certain embodiments, it is obvious to those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood, however, that the scope of the present invention is not limited to the specific embodiments described above, and all changes, equivalents, or alternatives included in the spirit and technical scope of the present invention are included in the scope of the present invention.

In this specification, when a part is connected to another part, it includes not only a direct connection but also a case where the part is electrically connected with another part in between. In addition, when a part includes an element, it does not exclude other elements unless specifically stated otherwise, but may include other elements.

The terms first, second, third, etc. in this specification may be used to describe various components, but such components are not limited by these terms. The terms are used for the purpose of distinguishing one element from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second or third component, and similarly, the second or third component may be alternately named.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

FIG. 1 is an exploded perspective view of a bent display device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a bent display device according to an embodiment of the present invention, and FIG. Sectional view of the bent display device according to the present invention.

1 to 3, the bent display apparatus according to the present invention may include a display panel 100 and a window 500 disposed on the display panel 100, and the like.

The display panel 100 according to an embodiment of the present invention may be a flexible display panel. In addition, the display panel 100 according to an embodiment of the present invention may be a bent display panel having a curved shape. The display panel 100 may have a curved shape or be formed in a flat shape, and then may have a curved shape due to coupling with the window 500 or a fixed frame (not shown) or the like. That is, the display panel 100 may have substantially the same shape as the window 500.

Hereinafter, for the sake of convenience, the flat portion at the center of the display panel 100 is referred to as a flat portion 101, and the curved portion at the edge of the flat portion 101 is referred to as a curved portion 102. The display panel 100 according to the exemplary embodiment of the present invention is shown to have the curved surface portion 102 formed on both edges of the flat surface portion 101 but the present invention is not limited thereto, (Not shown). The flat surface portion 101 and the curved surface portion 102 may be actually one display region as a divided region for convenience of explanation.

The display panel 100 may include a plurality of pixels PX for displaying an image. The plurality of pixels PX may be disposed on the flat surface portion 101 and the curved surface portion 102 of the display panel 100 to display an image.

The display panel 100 may include, for example, a flexible film such as a plastic film, and may be implemented by disposing an organic light emitting diode and a pixel circuit on a flexible film. A more detailed configuration of the display panel 100 will be described later.

The window 500 may be disposed on the display panel 100. [ The window 500 according to an embodiment of the present invention is made of a transparent hard material and can transmit the image of the display panel 100 while protecting the display panel 100 from external impact. In addition, the window 500 may be made of a flexible film material such as a plastic film.

The window 500 may have a curved shape. Hereinafter, for convenience of explanation, a flat portion at the center of the window 500 is referred to as a flat portion 501, and a bent portion at the edge of the flat portion 501 is referred to as a curved portion 502. The curved surface portion 502 may be divided into a first curved surface portion 502a at the outermost portion of the window 500 and a second curved surface portion 502b between the flat surface portion 501 and the first curved surface portion 502a.

The curved surface 502 of the window 500 according to an exemplary embodiment of the present invention is formed to have a curved surface 502 at both edges of the flat surface 501, 501). The plane portion 501, the first curved portion 502a, and the second curved portion 502b may be actually one continuous region as a divided region for convenience of explanation.

The curved surface portion 502 according to an embodiment of the present invention is described on the assumption that the curved surface portion 502 has the first curved surface portion 502a and the second curved surface portion 502b, And may include at least two or more portions arranged adjacent to each other in a direction perpendicular to the direction.

The first curved portion 502a and the second curved portion 502b may have substantially the same curvature. Specifically, the edge of the window material (the area where the first curved surface portion 502a is to be formed) is bent so as to have a constant curvature to form the plane portion and the first curved portion 502a, and then the edge of the plane portion The area where the curved surface portion 502b is to be formed) may be bent at a predetermined curvature to form the flat surface portion 501 and the second curved surface portion 502b. A more detailed method of forming the first curved portion 502a and the second curved portion 502b will be described later.

The window 500 according to an embodiment of the present invention may have an obtuse angle between the longitudinal plane of the plane portion 501 and the longitudinal plane of the curved portion 502. Preferably, the angle between the longitudinal plane of the flat portion 501 and the longitudinal plane of the curved portion 502 may be between 120 and 180 degrees.

The longitudinal section of the flat surface portion 501 means a cut surface between the flat surface portion 501 and the curved surface portion 502 and the longitudinal side surface of the curved surface portion 502 means the outermost edge surface of the window 500. [

Referring to FIG. 2, the first angle? ₁ formed by the longitudinal plane of the plane portion 501 and the longitudinal plane of the curved portion 502 may be 120 degrees. Referring to FIG. 3, The second angle? ₂ formed by the longitudinal section of the curved surface portion 502 may be 180 degrees.

The cross-sectional shape of the curved portion 502 according to an embodiment of the present invention may be part of an arc or part of an ellipse.

The angle formed by the flat surface portion 501 and the curved surface portion 502 may be the sum of the angles at which the first curved surface portion 502a and the second curved surface portion 502b are bent. The first curved portion 502a according to an embodiment of the present invention may be bent by 45 to 90 degrees and the second curved portion 502b may be bent by 45 to 90 degrees.

The window 500 according to an embodiment of the present invention may have substantially the same shape as the display panel 100. For example, when the display panel 100 has the flat portion 101 and the curved portion 102 at the edge of the flat portion 101, the window 500 also includes the flat portion 101 and the curved portion 102 of the display panel 100, And may have a flat surface portion 501 and a curved surface portion 502 corresponding to the portion 102. However, the present invention is not limited thereto, and the display panel 100 may have only the flat surface portion 101, even though the window 500 has the flat surface portion 501 and the curved surface portion 502.

A touch sensor (not shown) may be further disposed between the display panel 100 and the window 500 to detect a user's touch operation. However, the present invention is not limited thereto, and the touch sensor (not shown) may be implemented directly in the display panel 100 to be described later.

FIG. 4 is a partially enlarged view of a part of a display panel according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line I-I 'of FIG.

4 and 5, a display panel 100 according to an embodiment of the present invention includes a switching thin film transistor 10, a driving thin film transistor 20, a capacitor element 80, and an organic light emitting device and a plurality of pixels PX including a light emitting diode (OLED) 210. The organic light emitting diode 210 can be deposited at a relatively low temperature and can be applied mainly to a flexible display device due to low power, high brightness, and the like. Here, the pixel PX is a minimum unit for displaying an image, and the display panel 100 displays an image through a plurality of pixels PX.

Although it is shown in the accompanying drawings that two thin film transistors (TFT) and one capacitor are arranged in one pixel PX, it is not limited thereto, The above thin film transistor and two or more charge accumulating elements may be provided or may have various structures including additional wirings.

The display panel 100 includes a substrate 110, a gate line 151 disposed on the substrate 110, a data line 171 insulated from the gate line 151, and a common power line 172 . In general, one pixel can be defined as a boundary between the gate line 151, the data line 171, and the common power line 172, but the pixel is not limited to the above-described definition. The pixel may be defined by a black matrix or a pixel defining layer.

The substrate 110 may be made of a flexible material. Such a flexible material is a plastic material. Specifically, the substrate 110 may be formed of a material such as capton, polyethersulphone (PES), polycarbonate (PC), polyimide (PI), polyethyleneterephthalate (PET), polyethylene naphthalate (PEN), polyacrylate (PAR), fiber reinforced plastic (FRP), and the like.

Further, the substrate 110 has a thickness of 5 占 퐉 to 200 占 퐉. If the substrate 110 has a thickness of less than 5 mu m, it is difficult for the substrate 110 to stably support the organic light emitting element 210. [ On the other hand, if the substrate 110 has a thickness of 200 mu m or more, the flexible characteristics of the substrate 110 may be deteriorated.

A buffer layer 120 is disposed on the substrate 110. The buffer layer 120 serves to prevent penetration of impurities and to planarize the surface, and may be formed of various materials capable of performing such a role. For example, the buffer layer 120 may be formed of any one of a silicon nitride (SiNx) film, a silicon oxide (SiO ₂ ) film, and an oxynitride (SiO x N y) film. However, the buffer layer 120 is not necessarily required, and may be omitted depending on the type of the substrate 110 and the process conditions.

The switching semiconductor layer 131 and the driving semiconductor layer 132 are disposed on the buffer layer 120. The switching semiconductor layer 131 and the driving semiconductor layer 132 may be formed of any one of a polycrystalline silicon film, an amorphous silicon film, and an oxide semiconductor such as indium-gallium-zinc oxide (IGZO) or indium zinc tin oxide have. For example, when the driving semiconductor layer 132 is formed of a polycrystalline silicon film, the driving semiconductor layer 132 may include a channel region not doped with impurities, a source region formed by p + doping both sides of the channel region, . At this time, the ionic material to be doped is a P-type impurity such as boron (B), and mainly B ₂ H ₆ is used. These impurities depend on the kind of the thin film transistor. In an embodiment of the present invention, a thin film transistor having a PMOS structure using a P-type impurity is used as the driving thin film transistor 20, but the driving thin film transistor 20 is not limited thereto. Therefore, the driving thin film transistor 20 may be an NMOS structure or a CMOS structure.

A gate insulating layer 140 is disposed on the switching semiconductor layer 131 and the driving semiconductor layer 132. A gate insulating layer 140 may include at least one of tetraethoxysilane (TetraEthylOrthoSilicate, TEOS), silicon nitride (SiNx) and silicon oxide (SiO _2). For example, the gate insulating film 140 may have a double-layer structure in which a silicon nitride film having a thickness of 40 nm and a tetraethoxy silane film having a thickness of 80 nm are sequentially stacked.

Gate wirings including the gate electrodes 152 and 155 are disposed on the gate insulating film 140. The gate wiring further includes the gate line 151, the first capacitor plate 158, and other wiring. The gate electrodes 152 and 155 are disposed to overlap at least a part of the semiconductor layers 131 and 132, particularly, the channel region. The gate electrodes 152 and 155 serve to prevent impurities from being doped into the channel region when impurities are doped into the source and drain regions of the semiconductor layers 131 and 132 in the process of forming the semiconductor layers 131 and 132 .

The gate electrodes 152 and 155 and the first power storage plate 158 are disposed in the same layer and are made of substantially the same metal. The gate electrodes 152 and 155 and the first capacitor plate 158 may include at least one of molybdenum (Mo), chromium (Cr), and tungsten (W).

An interlayer insulating film 160 is disposed on the gate insulating film 140 to cover the gate electrodes 152 and 155. The interlayer insulating layer 160 may be formed of silicon nitride (SiNx), silicon oxide (SiOx), tetraethoxysilane (TEOS), or the like as in the case of the gate insulating layer 140, but is not limited thereto.

Data wirings including source electrodes 173 and 176 and drain electrodes 174 and 177 are disposed on the interlayer insulating film 160. The data wiring further includes a data line 171, a common power line 172, a second capacitor plate 178, and other wiring. The source electrodes 173 and 176 and the drain electrodes 174 and 177 are connected to the source region and the drain region of the semiconductor layers 131 and 132 through contact holes formed in the gate insulating film 140 and the interlayer insulating film 160, do.

As described above, the switching thin film transistor 10 includes the switching semiconductor layer 131, the switching gate electrode 152, the switching source electrode 173, and the switching drain electrode 174, Layer 132, a driving gate electrode 155, a driving source electrode 176, and a driving drain electrode 177. The configuration of the thin film transistors 10 and 20 is not limited to the above-described example, and can be variously modified to a known configuration that can be easily practiced by those skilled in the art.

The capacitor element 80 includes a first capacitor plate 158 and a second capacitor plate 178 interposed between the interlayer insulating film 160.

The switching thin film transistor 10 is used as a switching element for selecting a pixel to emit light. The switching gate electrode 152 is connected to the gate line 151. The switching source electrode 173 is connected to the data line 171. The switching drain electrode 174 is disposed apart from the switching source electrode 173 and connected to the first power storage plate 158.

The driving thin film transistor 20 applies a driving power to the pixel electrode 211 to cause the light emitting layer 212 of the organic light emitting element 210 in the selected pixel to emit light. The driving gate electrode 155 is connected to the first capacitor electrode plate 158. The driving source electrode 176 and the second power storage plate 178 are connected to the common power supply line 172, respectively. The driving drain electrode 177 is connected to the pixel electrode 211 of the organic light emitting diode 210 through the contact hole.

The switching thin film transistor 10 is operated by the gate voltage applied to the gate line 151 to transmit the data voltage applied to the data line 171 to the driving thin film transistor 20 . A voltage corresponding to the difference between the common voltage applied to the driving thin film transistor 20 from the common power supply line 172 and the data voltage transferred from the switching thin film transistor 10 is stored in the capacitor 80, A current corresponding to the voltage stored in the organic thin film transistor 20 flows into the organic light emitting element 210 through the driving thin film transistor 20 to cause the organic light emitting element 210 to emit light.

The same layers as the data line 171, the common power supply line 172, the source electrodes 173 and 176 and the drain electrodes 174 and 177 and the second power storage plate 178 disposed on the interlayer insulating film 160 A planarizing film 165 covering the patterned data lines is disposed.

The planarization layer 165 serves to eliminate the step and flatten the planarization layer 165 to increase the luminous efficiency of the organic light emitting diode 210 to be formed thereon. The planarization layer 165 may be formed of a material selected from the group consisting of polyacrylates resin, epoxy resin, phenolicresin, polyamides resin, polyimides resin, unsaturated polyesters resin, polyphenylenethers resin, polyphenylenesulfides resin, and benzocyclobutene (BCB).

The pixel electrode 211 of the organic light emitting diode 210 is disposed on the planarization layer 165. The pixel electrode 211 is connected to the drain electrode 177 through a contact hole formed in the planarization film 165.

A pixel defining layer 190 is formed on the planarization layer 165 to expose at least a portion of the pixel electrode 211 to define a pixel region. The pixel electrode 211 is arranged to correspond to the pixel region of the pixel defining layer 190. The pixel defining layer 190 may be formed of a resin such as polyacrylates resin and polyimides.

The light emitting layer 212 is disposed on the pixel electrode 211 in the pixel region and the common electrode 213 is disposed on the pixel defining layer 190 and the light emitting layer 212. The light emitting layer 212 is composed of a low molecular organic material or a high molecular organic material. At least one of a hole injection layer (HIL) and a hole transporting layer (HTL) may be further disposed between the pixel electrode 211 and the light emitting layer 212, and the light emitting layer 212 and the common electrode And at least one of an electron transport layer (ETL) and an electron injection layer (EIL)

The pixel electrode 211 and the common electrode 213 may be formed of any one of a transmissive electrode, a transflective electrode, and a reflective electrode.

Transparent conductive oxide (TCO) may be used for forming a transparent electrode. As the transparent conductive oxide (TCO), there are indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), and indium oxide (In ₂ O ₃ ).

(Ag), gold (Au), calcium (Ca), lithium (Li), chromium (Cr), aluminum (Al), copper (Cu) and the like to form a semi- The same metal or an alloy thereof may be used. At this time, the thickness of the transflective electrode and the reflective electrode is determined. Generally, the transflective electrode has a thickness of about 200 nm or less, and the reflective electrode has a thickness of 300 nm or more. As the thickness of the transflective electrode becomes thinner, the transmittance of light increases, but the resistance increases. As the thickness increases, the transmittance of light decreases.

Furthermore, the transflective and reflective electrodes may be formed in a multi-layer structure including a metal layer of a metal or metal alloy and a transparent conductive oxide (TCO) layer laminated on the metal layer.

A thin film encapsulation layer 250 is disposed on the common electrode 213. The thin film encapsulation layer 250 includes one or more inorganic films 251 and 253 and one or more organic films 252. The thin film encapsulation layer 250 has a structure in which the inorganic films 251 and 253 and the organic film 252 are alternately laminated. At this time, the inorganic film 251 is disposed at the lowermost part. That is, the inorganic film 251 is disposed closest to the organic light emitting element 210.

The thin film encapsulation layer 250 includes two inorganic films 251 and 253 and one organic film 252, but the embodiment of the present invention is not limited thereto.

An inorganic film (251, 253) is formed, including the _{Al 2 O 3, TiO 2,} ZrO, SiNx, SiO 2, AlON, AlN, SiON, Si 3 N4, ZnO, and Ta more than one inorganic substance of the ₂ O _5. The inorganic films 251 and 253 are formed by a chemical vapor deposition (CVD) method or an atomic layer deposition (ALD) method. However, the embodiment of the present invention is not limited thereto, and the inorganic films 251 and 253 may be formed through various methods known to those skilled in the art.

The organic film 252 is made of a polymer material. Here, the polymer material includes an acrylic resin, an epoxy resin, a polyimide, and a polyethylene. Further, the organic film 252 is formed through a thermal deposition process. The thermal evaporation process for forming the organic film 252 proceeds within a temperature range that does not damage the organic light emitting device 210. However, the embodiment of the present invention is not limited thereto, and the organic layer 252 may be formed through various methods known to those skilled in the art.

The inorganic films 251 and 253, in which the density of the thin film is densely formed, mainly suppress the penetration of moisture or oxygen. Most of moisture and oxygen are blocked by the inorganic films 251 and 253 from penetrating into the organic light emitting element 210.

The thin film encapsulation layer 250 may be formed to a thickness of 10 mu m or less. Therefore, the overall thickness of the display panel 100 can be made very thin. By applying the thin film encapsulation layer 250 as described above, the flexible characteristics of the display panel 100 can be maximized.

6A to 6C are cross-sectional views illustrating a method of manufacturing a bent display device according to an embodiment of the present invention.

A method of manufacturing a bent display device according to an embodiment of the present invention includes the steps of preparing a window material, bending an edge of a window material to form a flat portion and a first curved portion, And bending the edge to form a second curved portion between the flat portion and the first curved portion.

6A, the window material includes a region to be a center flat portion 501, a region to be a first curved portion 502a at the outermost portion, a region to be a flat portion 501, And a second curved surface portion 502b between the first and second curved surface portions 502a and 502b.

Referring to FIG. 6B, the edge of the window material is bent to form the first curved surface portion 502a. The first curved surface portion 502a according to an embodiment of the present invention may be formed by a thermoforming process using a forming die. However, the present invention is not limited thereto, and a commonly used molding process can be used without limitation.

The third angle? ₃ formed by the flat surface portion 501 and the first curved surface portion 502a forms the first curved surface portion 502a to be 45 degrees to 90 degrees.

Referring to FIG. 6C, the edge of the flat surface portion 501 is bent to form the second curved surface portion 502b. The second curved surface portion 502b according to an embodiment of the present invention may be formed by a thermoforming process using a forming die. However, the present invention is not limited thereto, and a commonly used molding process can be used without limitation.

The fourth angle? ₄ formed by the flat surface portion 501 and the second curved surface portion 502b forms the second curved surface portion 502b so as to be 45 degrees to 90 degrees.

As a result, the first curved portion of claim 5, each (θ _5), (502a) and the second curved surface 502 and a flat portion (501) including a curved portion (502b) forming a third angle (θ ₃₎ and And the fourth angle? ₄ . That is, the curved surface portion 502 may be formed to have an angle of 90 degrees or more with the flat surface portion 501. Preferably, the curved surface portion 502 may be formed at an angle of 120 to 180 degrees with the flat surface portion 501.

7A to 7D are cross-sectional views illustrating a method of manufacturing a bent display device according to another embodiment of the present invention. 7A to 7D are cross-sectional views illustrating a method of forming a window according to the present invention using a forming die.

7A and 7B, the step of forming the first curved surface portion 502a includes the steps of disposing the window material in the first molding apparatus 600, And forming the curved portion 502a.

The first molding apparatus 600 may include a lower mold 610, an upper mold 620, a pressing unit 630, and the like. The material for window can be formed by the pressing portion 630 while being supported by the lower mold 610 and the upper mold 620. [ The pressing portion 630 can press the edge of the window material to mold the first curved portion 502a bent at a predetermined angle.

The lower mold 610 may have a depressed shape the same as the shape of the material for window to be formed, and the pressing portion 630 may have the same shape as the shape of the material for window to be formed. As described above, the material for window can be primarily molded by using the first molding apparatus 600.

7C and 7D, the step of forming the second curved surface portion 502b may include a step of arranging a material for window formed with the first curved surface portion 502a in the second molding apparatus 700, 2 molding apparatus 700 to form the second curved surface portion 502b.

The second molding apparatus 700 may include a lower mold 710, an upper mold 720, a pressing unit 730, and the like. The material for window formed with the first curved surface portion 502a can be formed by the pressing portion 730 while being supported by the lower mold 710 and the upper mold 720. [

The pressing portion 730 can press the edge of the flat surface portion 501 to form the second curved surface portion 502b bent at a predetermined angle. For example, the lower mold 710 may have a depressed shape that is the same as the shape of the material for window to be molded, and the pressing portion 730 may have a shape that is the same as the shape of the material for window to be molded Lt; / RTI >

At this time, the lower mold 710 may have an escape structure 715 that can be received without being in contact with the first curved surface portion 502a. 7C and FIG. 7, the escape structure 715 is shown as having a recessed shape toward the inside of the lower mold 710, but is not limited thereto. It can be applied to any structure.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You can understand that you can. It is therefore to be understood that the embodiments described above are illustrative in all aspects and not restrictive.

100: display panel
500: Window
600: First molding device
700: Second molding device

Claims (17)

Display panel; And
And a window disposed on the display panel, the window including a planar portion and a curved portion of the planar edge,
Wherein the angle between the longitudinal plane of the flat portion and the longitudinal plane of the curved portion is an obtuse angle. The bent display device according to claim 1, wherein an angle between a vertical plane of the plane portion and a vertical plane of the curved portion is 120 to 180 degrees. The bent display device according to claim 1, wherein the cross-section of the curved portion is a part of an arc. The bent display according to claim 1, wherein the cross-section of the curved portion is a part of an ellipse. The bent display device according to claim 1, wherein the curved surface portion includes at least two portions disposed adjacent to each other in a direction perpendicular to the direction of bending. The bent display device of claim 5, wherein the curved surface portion includes a first curved surface portion disposed at an outermost portion of the window, and a second curved surface portion disposed between the planar portion and the first curved surface portion. The bent display according to claim 1, wherein the display panel has substantially the same shape as the window. The bent display according to claim 1, wherein the display panel is an organic light emitting display panel. The bent display according to claim 1, further comprising a touch sensor disposed between the display panel and the window. The bent display according to claim 1, further comprising a touch sensor formed inside the display panel. Preparing a material for a window;
Bending the edge of the window material to form a planar portion and a first curved portion; And
And bending an edge of the flat portion adjacent to the first curved portion to form a second curved portion between the flat portion and the first curved portion,
Wherein the first curved portion has an obtuse angle or more with respect to the plane portion. 12. The method of claim 11, wherein the first curved portion is formed at an angle of 120 to 180 degrees with respect to the flat portion. 12. The method of claim 11, wherein the forming of the first curved portion comprises bending the edge of the window material at an angle of 45 to 90 degrees. 14. The method of claim 13, wherein forming the second curved portion comprises bending an edge of the flat portion adjacent to the first curved portion at an angle of 45 to 90 degrees. 12. The method of claim 11, wherein forming the first curved portion comprises:
Disposing the window material in a first molding apparatus; And
And forming the first curved surface portion using the first molding apparatus. 16. The method of claim 15, wherein forming the second curved portion comprises:
Disposing the window material having the first curved surface portion in a second molding apparatus; And
And forming the second curved surface portion using the second molding apparatus. 17. The bent display apparatus according to claim 16, wherein the second molding apparatus has an escape structure for housing the first curved surface portion.

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