CN117079540A - Display device and method for manufacturing display device - Google Patents
Display device and method for manufacturing display device Download PDFInfo
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- CN117079540A CN117079540A CN202310533467.1A CN202310533467A CN117079540A CN 117079540 A CN117079540 A CN 117079540A CN 202310533467 A CN202310533467 A CN 202310533467A CN 117079540 A CN117079540 A CN 117079540A
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Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
- G09F9/335—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes being organic light emitting diodes [OLED]
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
An embodiment of the invention discloses a display device and a manufacturing method of the display device. The display device includes: a display module including a folding region and curvature change regions disposed at both sides of the folding region in a first direction; a first layer disposed on a surface of the display module facing the display surface; and a second layer disposed on a surface of the first layer facing the display module, wherein an empty space is formed between the display module and the second layer in the thickness direction in the curvature change region.
Description
Technical Field
The present invention relates to a display device and a method for manufacturing the display device, and more particularly, to a display device and a method for manufacturing the display device capable of improving defects of the display device when the display device is folded.
Background
In recent years, electronic devices are being widely used. As mobile type electronic devices and fixed type electronic devices, electronic devices including a display device that can provide visual information such as images or videos to a user in order to support various functions are being utilized in various manners.
In recent years, as other components for driving a display device become miniaturized, there is a trend that the specific gravity of the display device in an electronic apparatus is gradually increasing, and a structure that is bent from a flat state to have a predetermined angle or to be folded about an axis is also being developed.
The foldable display device can be folded or unfolded with reference to the folding axis. In this case, the display device includes a folded region that is folded and bent, and there is a possibility that defects such as cracks may occur in the display device due to compressive and tensile stresses occurring in the display device by repeating the bending of the folded region.
The technical information that the inventors have possessed for deriving the present invention or learned during the derivation of the present invention is not necessarily known to the general public prior to the filing date of the present invention.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a display device and a method of manufacturing the display device, which can prevent a defect from being generated in the display device (particularly in a folding region of the display device) due to folding of the display device.
However, these problems are examples, and the problem to be solved by the present invention is not limited thereto.
An embodiment of the present invention discloses a display device including: a display module including a folding region and curvature change regions disposed at both sides of the folding region in a first direction; a first layer disposed on a surface of the display module facing the display surface; and a second layer disposed on a surface of the first layer facing the display module, wherein an empty space is formed between the display module and the second layer in the thickness direction in the curvature change region.
In this embodiment, the first layer may include a space portion forming the empty space in a lower portion of the curvature varying region.
In the present embodiment, a cross section of the space portion, which is taken in the first direction, may be a quadrangle.
In this embodiment, a cross section of the space portion taken in the first direction may be a semi-elliptical shape.
In this embodiment, a cross section of the space portion taken in the first direction may include irregularities.
In the present embodiment, the space portion may be provided in plural, and the plural space portions may be arranged to be spaced apart along the first direction.
In this embodiment, the space portion may be disposed through the entire thickness of the first layer.
In this embodiment, the space may be disposed through a part of the thickness of the first layer.
In the present embodiment, a first protective member may be disposed in the folded region in the first layer with respect to the curvature change region, and a second protective member different from the first protective member may be disposed on the opposite side of the folded region.
In this embodiment, the second protection member may have a rigidity greater than that of the first protection member.
In this embodiment, the curvature changing region may include a curvature changing point which is a point at which a change rate of a slope of the display module changes from positive to negative or from negative to positive along the first direction when the display module is folded, and the space portion may be configured to be symmetrical with respect to the curvature changing point.
In the present embodiment, it may be that, for the space portion, at the curvature change point, the height of the space portion in the thickness direction becomes maximum.
In this embodiment, the first layer and the second layer may be configured to be cut at the center of the folded region.
In this embodiment, the second layer may be a digitizer layer.
Other embodiments of the present invention disclose a method of manufacturing a display device, including: a step of preparing a display module including a folding region and curvature change regions arranged on both sides of the folding region in a first direction; a step of disposing a first layer including a space portion on a surface of the display module facing the display surface so as to form an empty space in a lower portion of the curvature changing region; and disposing a second layer on a surface of the first layer facing the display module.
In the present embodiment, a cross section of the space portion, which is taken in the first direction, may be a quadrangle.
In this embodiment, a cross section of the space portion taken in the first direction may be a semi-elliptical shape.
In this embodiment, a cross section of the space portion taken in the first direction may include irregularities.
In this embodiment, the space portion may be formed through a part of the thickness of the first layer.
In this embodiment, the step of configuring the first layer may include: and disposing a first protective member in the folded region of the first layer based on the curvature change region and disposing a second protective member different from the first protective member on an opposite side of the folded region.
In this embodiment, the second protection member may have a rigidity greater than that of the first protection member.
In this embodiment, the curvature changing region may include a curvature changing point which is a point at which a change rate of a slope of the display module changes from positive to negative or from negative to positive along the first direction when the display module is folded, and the space portion may be configured to be symmetrical with respect to the curvature changing point.
In this embodiment, the step of configuring the first layer may include: a step of configuring at the curvature change point such that the thickness of the first layer becomes minimum.
In this embodiment, the second layer may be a digitizer layer.
Other aspects, features, and advantages than those described above will become apparent from the following detailed description, claims, and drawings for practicing the invention.
(effects of the invention)
According to the embodiments of the present invention, when the display device is folded, the display device can secure a predetermined curvature in the folded region, whereby a defect of the display device can be prevented.
The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned should be clearly understood by those skilled in the art from the description of the claims.
Drawings
Fig. 1 and 2 are perspective views schematically showing a display device according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view schematically showing a part of a display device according to an embodiment of the present invention, which may correspond to a cross-section taken along line III-III' of fig. 1.
Fig. 4 is a cross-sectional view schematically showing a display panel according to an embodiment of the present invention, which may correspond to a cross-section taken along the line IV-IV' of fig. 1.
Fig. 5 and 6 are cross-sectional views schematically showing a display device according to an embodiment of the present invention.
Fig. 7 is a diagram schematically showing a display device according to an embodiment of the present invention.
Fig. 8 to 11 are cross-sectional views schematically showing display devices according to various embodiments of the present invention.
Fig. 12 is a cross-sectional view schematically showing a display device according to still another embodiment of the present invention.
Fig. 13 to 15 are diagrams schematically showing a method of manufacturing a display device according to an embodiment of the present invention.
Symbol description:
1: a display device; 10: a display panel; 20: a display module; 30: a first layer; 40: a second layer; 50: a third layer; 80: a space portion; CW: covering the window; FA: a folding region; NFA: a non-folded region; IA: curvature change region.
Detailed Description
While the invention is susceptible to various modifications and alternative embodiments, specific embodiments have been shown by way of example in the drawings and are herein described in detail. The effects, features, and methods of achieving these effects and features of the present invention will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and the present invention can be implemented in various forms.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, and when the description is given with reference to the drawings, the same or corresponding constituent elements are given the same reference numerals, and the repeated description thereof will be omitted.
In the following embodiments, the terms first, second, etc. are not limiting terms, and are used to distinguish one constituent element from another.
In the following embodiments, singular references include plural references where not explicitly stated to the contrary.
In the following embodiments, the inclusion or the like should be understood to refer to the presence of features or elements described in the specification and not to the exclusion of any other feature or element that may be added to it.
In the following embodiments, when a portion of a film, a region, a constituent element, or the like is located on or over another portion, it includes not only a case of being directly located on the other portion but also a case where another film, a region, a constituent element, or the like is present therebetween.
The size of the constituent elements may be enlarged or reduced for convenience of explanation. For example, the sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of description, and the present invention is not necessarily limited to the case shown in the drawings.
In the following examples, the x-axis, y-axis and z-axis are not limited to three axes in a rectangular coordinate system, but may be construed to include their broader meanings. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may also refer to mutually different directions that are not orthogonal to each other.
Where an embodiment may be implemented in a different manner, the particular sequence of steps may be performed differently than as illustrated. For example, two steps described in succession may be executed substantially concurrently or the steps may be executed in the reverse order of the description.
Fig. 1 and 2 are perspective views schematically showing a display device according to an embodiment of the present invention. Specifically, fig. 1 shows a state in which the display device 1 is unfolded, and fig. 2 shows a state in which the display device 1 is folded.
Referring to fig. 1 and 2, the display device 1 is a device that displays a moving image or a still image, and can be used not only as a display screen of a portable electronic device such as a mobile phone (mobile phone), a smart phone (smart phone), a tablet PC (tablet personal computer), a mobile communication terminal, an electronic manual, an electronic book, PMP (portable multimedia player), a navigator, UMPC (Ultra Mobile PC), or the like, but also as a display screen of various products such as a television, a notebook, a monitor, an advertisement board, an internet of things (IOT) device, or the like. Further, the display device 1 according to an embodiment may be used in a wearable device (e.g., a smart watch (smart watch), a watch phone (watch phone), a glasses type display, and a head mounted display (head mounted display, HMD)). The display device 1 according to one embodiment may be used as an instrument panel of a vehicle, an instrument center box (center fascia) of a vehicle, a CID (Center Information Display) disposed on the instrument panel, an indoor mirror display (room mirror display) for replacing a rear view mirror of a vehicle, or a display disposed on the back surface of a front seat as an entertainment apparatus for a rear seat of a vehicle.
As shown in fig. 1, the display device 1 may have a substantially rectangular shape. For example, as shown in fig. 1, the display device 1 may be a planar shape having an overall rectangular shape with a short side extending in a first direction (for example, x-direction or-x-direction) and a long side extending in a second direction (for example, y-direction or-y-direction). In an embodiment, the portion where the short side extending in the first direction (e.g., x-direction or-x-direction) meets the long side extending in the second direction (e.g., y-direction or-y-direction) may have a right angle shape or may have a rounded shape having a predetermined curvature. Of course, the planar shape of the display device 1 is not limited to a rectangle, and may have a polygonal shape, a circular shape, or an elliptical shape other than a rectangle.
The display device 1 may include a lower cover LC, a display panel 10, and a cover window CW.
The lower cover LC may form the appearance of the lower surface of the display device 1. The lower cover LC may include plastic, metal, or both plastic and metal. The lower cover LC may include a first portion P1 and a second portion P2 supporting the display panel 10. The lower cover LC may be folded centering on a folding axis FAX defined between the first and second portions P1 and P2. In an embodiment, the lower cover LC may further include a hinge portion HP, which may be disposed between the first and second portions P1 and P2.
The display panel 10 may include a display area DA and a peripheral area PA. The display area DA may display an image. At this time, the pixels PX may be disposed in the display area DA. The display panel 10 may provide an image using light emitted from the pixels PX. Each pixel PX can emit light using a display element. In one embodiment, each pixel PX can emit red, green or blue light, respectively. In one embodiment, each pixel PX can emit red, green, blue or white light, respectively.
The peripheral area PA may be an area where no image is provided, and may be a non-display area. The peripheral area PA may surround at least a portion of the display area DA. For example, the peripheral area PA may surround the entire display area DA. A driving portion for supplying an electric signal to the pixel PX, a power supply wiring for supplying a power supply, or the like may be arranged in the peripheral area PA. For example, a scan driving section for applying a scan signal to the pixels PX may be disposed in the peripheral area PA. Further, a data driving section for applying a data signal to the pixel PX may be arranged in the peripheral area PA.
The display area DA may include a first display area DA1 and a second display area DA2 disposed on both sides centering on a folding axis FAX crossing the display area DA. The first display area DA1 may be located on the first portion P1 of the lower cover LC and the second display area DA2 may be located on the second portion P2 of the lower cover LC. The display panel 10 may provide the first and second images using light emitted from the plurality of pixels PX disposed in the first and second display regions DA1 and DA2. In an embodiment, the first image and the second image may be a portion of any one of the images provided through the display area DA of the display panel 10. Alternatively, in an embodiment, the display panel 10 may provide the first image and the second image independently of each other.
The display panel 10 may be folded about the folding axis FAX. In an embodiment, in a case where the display panel 10 is folded, the first display area DA1 and the second display area DA2 of the display panel 10 may face each other. In other embodiments, in the case where the display panel 10 is folded, the first display area DA1 and the second display area DA2 of the display panel 10 may face in opposite directions to each other.
That is, in an embodiment, the display panel 10 may be folded In (In-Folding) or folded Out (Out-Folding) based on the Folding axis FAX. Here, the inner fold may represent a case where the display panel 10 is folded in the z-direction with reference to the folding axis FAX, and the outer fold may represent a case where the display panel 10 is folded in the-z-direction with reference to the folding axis FAX. In other words, the inner fold may represent a case where upper surfaces of the cover windows CW folded to be disposed on the display panel 10 face each other, and the outer fold may represent a case where lower surfaces of the cover windows CW folded to be facing each other. At this time, the lower surface of the cover window CW may represent a surface closer to the substrate 100 (refer to fig. 4) than the upper surface of the cover window CW in the-z direction.
On the other hand, a case where the folding axis FAX extends in the second direction (y direction) is shown in fig. 1 and 2, but the present invention is not limited thereto. In an embodiment, the folding axis FAX may also extend in a first direction (x-direction) intersecting the second direction (y-direction). Alternatively, the folding axis FAX may extend in a direction intersecting the first direction (x direction) and the second direction (y direction) on the xy plane.
Further, in fig. 1 and 2, a case where the folding axis FAX is one is shown, but the present invention is not limited thereto. In an embodiment, the display panel 10 may be folded with reference to two folding axes FAX crossing the display area DA. For example, in the case where the display panel 10 is folded with reference to two Folding axes FAX, the display panel 10 may be folded inwardly (In-Folding) with reference to one Folding axis FAX and folded outwardly (Out-Folding) with reference to the remaining Folding axes FAX. Alternatively, the display panel 10 may be folded In (In-Folding) or folded Out (Out-Folding) with reference to both Folding axes FAX. In an embodiment, the display panel 10 may be folded with reference to a plurality of folding axes FAX crossing the display area DA. At this time, the display panel 10 may be folded In (In-Folding) or folded Out (Out-Folding) with respect to the respective Folding axes FAX.
The cover window CW may be disposed on the display panel 10 to cover the display panel 10. The cover window CW may be folded or bent along an external force without the generation of a crack (ack) or the like. When the display panel 10 is folded around the folding axis FAX, the cover window CW may be folded together to cover the display panel 10.
Fig. 3 is a cross-sectional view schematically showing a part of a display device according to an embodiment of the present invention. Fig. 3 may correspond to a section taken along line III-III' of fig. 1.
Referring to fig. 3, the display device 1 may include a display module 20, a first layer 30, a second layer 40, and a third layer 50.
The display module 20 may include a display panel 10 and a cover window CW disposed on the display panel 10. The display panel 10 may display information processed by the display device 1. For example, the display panel 10 may display execution screen information of an application driven in the display device 1 or UI (User Interface), GUI (Graphic User Interface, graphical User Interface) information related to the execution screen information.
The display panel 10 may include a display element. For example, the display panel 10 may be an organic light emitting display panel using an organic light emitting diode (organic light emitting diode), a subminiature light emitting diode display panel using a subminiature light emitting diode (micro LED), a quantum dot light emitting display panel using a quantum dot light emitting diode (Quantum dot Light Emitting Diode) including a quantum dot light emitting layer, or an inorganic light emitting display panel using an inorganic light emitting element including an inorganic semiconductor. Hereinafter, the display panel 10 is mainly described in detail as an organic light emitting display panel using organic light emitting diodes as display elements.
The cover window CW may be disposed on the display panel 10. The cover window CW may protect the display panel 10. In an embodiment, the cover window CW may be a flexible window. The cover window CW may protect the display panel 10 while being easily bent along an external force without the generation of a crack (ack) or the like. The cover window CW may include at least one of glass, sapphire, and plastic. The cover window CW may be, for example, ultra Thin tempered Glass (UTG), transparent polyimide (Colorless Polyimide, CPI). In one embodiment, the cover window CW may have a structure in which a polymer layer having flexibility is disposed on one surface of the glass substrate, or may be composed of only the polymer layer.
The cover window CW may be attached to the display panel 10 by an adhesive member. The adhesive means may be a pressure sensitive adhesive (pressure sensitive adhesive, PSA). The adhesive member may be a transparent adhesive member such as an optically clear adhesive (optically clear adhesive, OCA) film. Such an adhesive member may be formed on the upper portion of the display panel 10 by being formed in a film form to be attached to the upper portion of the display panel 10 (for example, the upper portion of the encapsulation layer) or by being formed in a material form to be coated on the upper portion of the display panel 10.
The first layer 30 may be disposed on one surface of the display panel 10 (for example, a surface facing the display surface on which the cover window CW is disposed). In one embodiment, the first layer 30 may be a cushion layer. The cushion layer may absorb external impact to prevent breakage of the display panel 10. The cushion layer may include a polymer resin such as polyurethane (polyurethane), polycarbonate (polycarbonate), polypropylene (polypropylene), polyethylene (polyethylene), or the like, or may include a substance having elasticity such as a sponge in which rubber, a urethane-based substance, or an acrylic-based substance is foamed. Alternatively, the underlayer may include a metal species such as molybdenum (Mo), aluminum (Al), copper (Cu), and/or titanium (Ti).
The second layer 40 may be disposed at a lower portion of the first layer 30 (i.e., at a side of the first layer 30 opposite to the display panel 10). In an embodiment, the second layer 40 may be a digitizer layer. The digitizer layer may include a body layer and/or a pattern layer. The digitizer layer may sense a signal input from an external electronic pen or the like through the pattern layer. In particular, the digitizer layer may perceive the strength, direction, etc. of signals input from an electronic pen or the like. In one embodiment, the aforementioned lower cover LC may be disposed at a lower portion of the second layer 40. At this time, a protective layer may be further disposed between the second layer 40 and the lower cover LC. Hereinafter, for convenience of explanation, as shown in fig. 3, the explanation of the lower portion of the second layer 40 will be omitted.
In an embodiment, a third layer 50 may also be disposed between the display panel 10 and the first layer 30. For example, the third layer 50 may be a protective film layer or a support sheet layer. The third layer 50 may be disposed at a lower portion of the display panel 10 to support and protect the display panel 10. In one embodiment, the third layer 50 may have various structures according to whether the display device 1 is folded or not and a folded configuration. For example, as shown in fig. 3, the third layer 50 may be provided as one body, or although not shown, the third layer 50 may include a folded structure in the folded region FA. The folding structure may change in shape in the folding area FA or change in length in the folding area FA when the display device 1 is folded. The folded structure may include a pattern portion formed with an opening, or include a concave-convex pattern, or include links (links) rotatably connected to each other, or the like. However, the present invention is not limited thereto. Further, the display device 1 may include a first non-folding area NFA, a folding area FA, and a second non-folding area NFA2, which will be described later in fig. 5 and 6.
In one embodiment, the third layer 50 may include at least one of glass, polymer resin, and metal. In one embodiment, the folded structure may include at least one of glass, polymer resin, and metal. In one embodiment, the folded structure of the third layer 50 may be provided with a metal substance, and the rest of the third layer 50 other than the folded structure may be provided with a non-metal substance. However, the present invention is not limited thereto.
As described above, the third layer 50 such as a protective film layer, the first layer 30 such as a cushion layer, and the second layer 40 such as a digitizer layer may be sequentially disposed at the lower portion of the display panel 10. However, the present invention is not limited thereto, and it should be understood that more than one layer may be disposed at the lower portion of the display panel 10. Hereinafter, for convenience of explanation, a description will be given centering on a case where a third layer 50 such as a protective film layer, a first layer 30 such as a cushion layer, and a second layer 40 such as a digitizer layer are sequentially disposed at the lower portion of the display panel 10.
Fig. 4 is a cross-sectional view schematically showing a display panel according to an embodiment of the present invention, which may correspond to a cross-section taken along the line IV-IV' of fig. 1.
Referring to fig. 4, the display panel 10 may include a substrate 100, a buffer layer 111, a pixel circuit layer PCL, a display element layer DEL, and an encapsulation layer 300.
The substrate 100 may include glass or a polymer resin such as polyethersulfone (polyethersulfone), polyarylate (polyarylate), polyetherimide (polyethylenimide), polyethylene naphthalate (polyethylene naphthalate), polyethylene terephthalate (polyethylene terephthalate), polyphenylene sulfide (polyphenylene sulfide), polyimide (polyimide), polycarbonate (polycarbonate), cellulose triacetate, cellulose acetate propionate (cellulose acetate propionate), and the like. In one embodiment, the substrate 100 may have a multi-layer structure including the base layer of the polymer resin and a barrier layer (not shown). The substrate 100 including the polymer resin may have a flexible, crimpable, bendable property.
The buffer layer 111 may be disposed on the substrate 100. The buffer layer 111 may include an inorganic insulator such as silicon nitride, silicon oxynitride, and silicon oxide, and may be a single layer or a plurality of layers including the aforementioned inorganic insulator.
The pixel circuit layer PCL may be disposed on the buffer layer 111. The pixel circuit layer PCL may include a thin film transistor TFT included in the pixel circuit, and an inorganic insulating layer IIL, a first planarization layer 115, and a second planarization layer 116 disposed below and/or above constituent elements of the thin film transistor TFT. The inorganic insulating layer IIL may include a first gate insulating layer 112, a second gate insulating layer 113, and an interlayer insulating layer 114.
The thin film transistor TFT may include a semiconductor layer a, and the semiconductor layer a may include polysilicon. Alternatively, the semiconductor layer a may include amorphous (amorphlus) silicon, or include an oxide semiconductor, or include an organic semiconductor, or the like. The semiconductor layer a may include a channel region (a central hollow portion in a layer denoted by a) and drain and source regions (hatched portions in the layer denoted by a) respectively arranged on both sides of the channel region. The gate electrode G may overlap the channel region.
The gate electrode G may include a low-resistance metal substance. The gate electrode G may include a conductive substance containing molybdenum (Mo), aluminum (Al), copper (Cu), titanium (Ti), or the like, and may be formed of a plurality of layers or a single layer including the above-described materials.
The first gate insulating layer 112 between the semiconductor layer a and the gate electrode G may include, for example, silicon oxide (SiO 2 ) Silicon nitride (SiN) X ) Silicon oxynitride (SiON), aluminum oxide (Al) 2 O 3 ) Titanium oxide (TiO) 2 ) Tantalum oxide (Ta) 2 O 5 ) Hafnium oxide (HfO) 2 ) Or zinc oxide (ZnO) X ) Such as an inorganic insulator. Zinc oxide (ZnO) X ) Can be zinc oxide (ZnO) and/or zinc peroxide (ZnO) 2 )。
The second gate insulating layer 113 may be disposed to cover the gate electrode G. The second gate insulating layer 113 may include, for example, silicon oxide (SiO) similar to the first gate insulating layer 112 2 ) Silicon nitride (SiN) X ) Silicon oxynitride (SiON), aluminum oxide (Al) 2 O 3 ) Titanium oxide (TiO) 2 )、Tantalum oxide (Ta) 2 O 5 ) Hafnium oxide (HfO) 2 ) Or zinc oxide (ZnO) X ) Such as an inorganic insulator. Zinc oxide (ZnO) X ) Can be zinc oxide (ZnO) and/or zinc peroxide (ZnO) 2 )。
An upper electrode CE2 of the storage capacitor Cst may be disposed on an upper portion of the second gate insulating layer 113. The upper electrode CE2 may overlap the gate electrode G therebelow. At this time, the gate electrode G and the upper electrode CE2 overlapped with each other with the second gate insulating layer 113 interposed therebetween may form the storage capacitor Cst of the pixel circuit. That is, the gate electrode G may function as the lower electrode CE1 of the storage capacitor Cst. As described above, the storage capacitor Cst and the thin film transistor TFT may be formed to overlap. In some embodiments, the storage capacitor Cst may also be formed not to overlap the thin film transistor TFT.
The upper electrode CE2 may include aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), molybdenum (Mo), titanium (Ti), tungsten (W), and/or copper (Cu), and may be a single layer or a multilayer of the foregoing.
The interlayer insulating layer 114 may cover the upper electrode CE2. The interlayer insulating layer 114 may include silicon oxide (SiO 2 ) Silicon nitride (SiN) X ) Silicon oxynitride (SiON), aluminum oxide (Al) 2 O 3 ) Titanium oxide (TiO) 2 ) Tantalum oxide (Ta) 2 O 5 ) Hafnium oxide (HfO) 2 ) Or zinc oxide (ZnO) X ) Etc. Zinc oxide (ZnO) X ) Can be zinc oxide (ZnO) and/or zinc peroxide (ZnO) 2 ). The interlayer insulating layer 114 may be a single layer or a plurality of layers including the aforementioned inorganic insulator.
The drain electrode D and the source electrode S may be respectively located on the interlayer insulating layer 114. The drain electrode D and the source electrode S may include a material having excellent conductivity. The drain electrode D and the source electrode S may include a conductive substance including molybdenum (Mo), aluminum (Al), copper (Cu), titanium (Ti), or the like, and may be formed of multiple layers or single layers including the above materials. As an example, the drain electrode D and the source electrode S may have a multi-layered structure of Ti/Al/Ti.
The first planarization layer 115 may be configured to cover the drain electrode D and the source electrode S. The first planarization layer 115 may include an organic insulating layer. The first planarization layer 115 may include an organic insulator such as a general polymer such as polymethyl methacrylate (PMMA) or Polystyrene (PS), a polymer derivative having a phenol group, an acrylic polymer, an imide polymer, an aryl ether polymer, an amide polymer, a fluorine polymer, a para-xylene polymer, a vinyl alcohol polymer, and a mixture thereof.
The connection electrode CML may be disposed on the first planarization layer 115. At this time, the connection electrode CML may be connected to the drain electrode D or the source electrode S through the contact hole of the first planarization layer 115, and fig. 4 shows a case where the connection electrode CML is connected to the drain electrode D. The connection electrode CML may include a material excellent in conductivity. The connection electrode CML may include a conductive substance including molybdenum (Mo), aluminum (Al), copper (Cu), titanium (Ti), or the like, and may be formed of a plurality of layers or a single layer including the above-described materials. As an example, the connection electrode CML may have a Ti/Al/Ti multilayer structure.
The second planarization layer 116 may be configured to cover the connection electrode CML. The second planarization layer 116 may include an organic insulating layer. The second planarization layer 116 may include an organic insulator such as a general polymer such as polymethyl methacrylate (PMMA) or Polystyrene (PS), a polymer derivative having a phenol group, an acrylic polymer, an imide polymer, an aryl ether polymer, an amide polymer, a fluorine polymer, a para-xylene polymer, a vinyl alcohol polymer, and a mixture thereof.
The display element layer DEL may be disposed on the pixel circuit layer PCL. The display element layer DEL may include display elements DE and pixel defining films 118. The display element DE may be an Organic Light Emitting Diode (OLED). The pixel electrode 211 of the display element DE may be electrically connected to the connection electrode CML through a contact hole of the second planarization layer 116.
The pixel electrode 211 may include, for example, indium Tin Oxide (ITO), indium zinc oxide (IZO;indium zinc oxide), zinc oxide (ZnO; zinc oxide), indium oxide (In 2 O 3 : an indium oxide), an indium gallium oxide (IGO; indium gallium oxide) or aluminum zinc oxide (AZO; aluminum zinc oxide) such a conductive oxide. As other embodiments, the pixel electrode 211 may include a reflective film including silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), or a compound thereof. As yet another embodiment, the pixel electrode 211 may further include a thin film formed of Indium Tin Oxide (ITO), indium Zinc Oxide (IZO), zinc oxide (ZnO), or indium oxide (In) 2 O 3 ) And (3) forming a film.
A pixel defining film 118 having an opening 118OP exposing a central portion of the pixel electrode 211 may be disposed on the pixel electrode 211. The pixel defining film 118 may include an organic insulator and/or an inorganic insulator. The opening 118OP may define a light emitting region (hereinafter, referred to as a light emitting region) EA of light emitted from the display element DE. For example, the width of the opening 118OP may correspond to the width of the light emitting area EA of the display element DE.
In one embodiment, the pixel defining film 118 may include a light blocking substance, and may be set to black. The light blocking material may include a resin or paste containing carbon black, carbon nanotubes, black dye, metal particles (e.g., nickel, aluminum, molybdenum, and alloys thereof), metal oxide particles (e.g., chromium oxide) or metal nitride particles (e.g., chromium nitride), and the like. In the case where the pixel defining film 118 includes a light blocking substance, external light reflection due to a metal structure disposed at a lower portion of the pixel defining film 118 can be reduced.
A spacer 119 may be disposed on the pixel defining film 118. The spacers 119 are provided to prevent breakage of the substrate 100 in the manufacturing method of the display device 1. A mask sheet may be used in manufacturing the display panel 10, and at this time, the spacer 119 may prevent the mask sheet from possibly entering the inside of the opening 118OP of the pixel defining film 118 or from being closely adhered to the pixel defining film 118, which may damage or break a portion of the substrate 100 due to the mask sheet when depositing a deposition material on the substrate 100.
The spacer 119 may include an organic insulator such as polyimide. Alternatively, the spacer 119 may include an inorganic insulator such as silicon nitride or silicon oxide, or an organic insulator and an inorganic insulator.
In an embodiment, the spacer 119 may include a substance different from the pixel defining film 118. Alternatively, in other embodiments, the spacer 119 may include the same substance as the pixel definition film 118, in which case the pixel definition film 118 and the spacer 119 may be formed together in a mask process using a halftone mask or the like.
An intermediate layer 212 may be disposed on the pixel definition film 118. The intermediate layer 212 may include a light emitting layer 212b disposed in the opening 118OP of the pixel defining film 118. The light emitting layer 212b may include a high molecular organic substance or a low molecular organic substance emitting light of a predetermined color.
The first functional layer 212a and the second functional layer 212c may be disposed below and above the light emitting layer 212b, respectively. The first functional layer 212a may include, for example, a hole transport layer (HTL: hole Transport Layer), or a hole transport layer and a hole injection layer (HIL: hole Injection Layer). The second functional layer 212c is a constituent element disposed above the light-emitting layer 212b, and may be optional. The second functional layer 212c may include an electron transport layer (ETL: electron Transport Layer) and/or an electron injection layer (EIL: electron Injection Layer). The first functional layer 212a and/or the second functional layer 212c may be a common layer formed to cover the entire substrate 100 as in the case of the counter electrode 213 described later.
The counter electrode 213 may be formed of a conductive substance having a low work function. For example, the counter electrode 213 may include a (semi) transparent layer containing silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), or an alloy thereof, or the like. Alternatively, the counter electrode 213 may further include a material such as ITO, IZO, znO or In on the (semi) transparent layer including the foregoing material 2 O 3 Such a layer.
In some embodiments, a capping layer (not shown) may also be disposed on the counter electrode 213. The cap layer may comprise inorganic and/or organic materials such as LiF.
The encapsulation layer 300 may be disposed on the opposite electrode 213. In an embodiment, the encapsulation layer 300 may include at least one inorganic encapsulation layer and at least one organic encapsulation layer, and fig. 4 illustrates a case where the encapsulation layer 300 includes a first inorganic encapsulation layer 310, an organic encapsulation layer 320, and a second inorganic encapsulation layer 330, which are sequentially stacked.
The first and second inorganic encapsulation layers 310 and 330 may include one or more inorganic substances among aluminum oxide, titanium oxide, tantalum oxide, hafnium oxide, zinc oxide, silicon nitride, and silicon oxynitride. The organic encapsulation layer 320 may include a polymer-based material. Examples of the polymer-based material include acrylic resins, epoxy resins, polyimide resins, and polyethylene resins. As an example, the organic encapsulation layer 320 may include an acrylate (acrylate) based resin.
Although not shown, a touch sensor layer may be disposed on the encapsulation layer 300. The touch sensor layer may obtain coordinate information related to an external input (e.g., a touch event).
Although not shown, an optical functional layer may be disposed on the touch sensor layer. The optical functional layer may reduce the reflectance of light (external light) incident from the outside toward the display device 1 and/or may improve the color purity of light emitted from the display device 1. As an example, the optical functional layer may include a phase retarder (retarder) and/or a polarizer (polarizer). The phase retarder may be a film type or a liquid crystal coating type, and may include a lambda/2 phase retarder and/or a lambda/4 phase retarder. The polarizer may also be a film type, which may include an extended synthetic resin film, or a liquid crystal coating type, which may include liquid crystals arranged in a predetermined arrangement. The phase retarder and the polarizer may further include a protective film.
The cover window CW (see fig. 3) may be disposed on the display panel 10, and may be disposed at an upper portion thereof in the case of disposing the touch sensor layer and/or the optical function layer.
Fig. 5 and 6 are cross-sectional views schematically showing a display device according to an embodiment of the present invention, which may correspond to the same cross-section as fig. 3. Specifically, fig. 5 shows a state in which the display device is unfolded, and fig. 6 shows a state in which the display device is folded.
Referring to fig. 5 and 6, the display device 1 may include a folded area FA and an unfolded area NFA. The folded area FA and the unfolded area NFA may be areas defined to extend also in the thickness direction (e.g., z-direction of fig. 5) of the display device 1. In other words, the display panel 10 can also be said to include a folded area FA and an unfolded area NFA.
The folding area FA is an area including the folding axis FAX, and may be an area that is folded with a predetermined curvature about the folding axis FAX. Specifically, the folded area FA may be curved to have a predetermined curvature so as to include a curvature area CV that substantially forms a part of an arc. Further, the folded area FA may include an extension area EX extending from both ends of the curvature area CV (e.g., a first extension area EX1 connected to one end of the curvature area CV and a second extension area EX2 connected to the other end of the curvature area CV). The extension region EX may have a curved surface continuous with the curvature of the curvature region CV, and as shown in fig. 6, the first extension region EX1 and the second extension region EX2 may be arranged to face each other when the display device 1 is folded.
The non-folded region NFA may be connected to both ends of the folded region FA (specifically, the first extension region EX1 and the second extension region EX 2). The non-folded region NFA may be a region that is not substantially folded (i.e., is substantially planar). The non-folded area NFA being substantially planar may mean that it is planar except for a portion of the non-folded area NFA adjacent to the folded area FA. The non-folding area NFA may include a first non-folding area NFA1 connected to the first extension area EX1 and a second non-folding area NFA2 connected to the second extension area EX2, and as shown in fig. 6, the first non-folding area NFA1 and the second non-folding area NFA2 may be configured to face each other when the display device 1 is folded.
As shown in fig. 6, the display panel 10 may be folded in a dumbbell shape. Specifically, the display panel 10 may be bent to have a predetermined curvature in the curvature region CV. The first extension region EX1 and the second extension region EX2 may extend so as to be opposite to and close to each other as going in a direction away from the curvature region CV. The first non-folded region NFA1 and the second non-folded region NFA2 may be opposite to each other and substantially parallel. Thus, the shape when the display panel 10 is folded may be the same as a dumbbell shape.
On the other hand, the folded area FA and the unfolded area NFA may overlap with the display area DA (refer to fig. 1). For example, the folding area FA may overlap a portion of the first display area DA1 and the second display area DA 2. Further, the first non-folding area NFA1 may overlap a portion of the first display area DA1, and the second non-folding area NFA2 may overlap a portion of the second display area DA 2.
The third layer 50 may be disposed at a lower portion of the display panel 10, and the first layer 30 may be disposed at a lower portion of the third layer 50. A second layer 40 may be disposed under the first layer 30. In an embodiment, the first layer 30 and the second layer 40 may be configured to be cut at the center of the folding area FA when the display device 1 is folded. That is, the first layer 30 and the second layer 40 may be configured to be spaced apart from each other at the center of the folded area FA. This is to prevent the first layer 30, such as a cushion layer, and the second layer 40, such as a digitizer layer, from being deformed or broken in the folded area FA due to compressive and tensile stresses due to folding.
Fig. 7 is a diagram schematically showing a display device according to an embodiment of the present invention.
Referring to fig. 5 to 7, the display panel 10 may further include a curvature varying region IA. The curvature changing region IA may be disposed at both ends in a first direction (e.g., x-direction of fig. 5) of the folded region FA. In an embodiment, the curvature varying region IA may include a first curvature varying region IA1 disposed at one end of the folded region FA and a second curvature varying region IA2 disposed at the other end of the folded region FA. The first curvature changing region IA1 and the second curvature changing region IA2 are similar, and therefore the following description will be made centering on the first curvature changing region IA 1.
The first curvature changing region IA1 may be a region disposed at one end of the folded region FA and overlapping with a part of the folded region FA and a part of the first non-folded region NFA 1. That is, the first curvature changing region IA1 may overlap with a portion of the first extension region EX1 and a portion of the first non-folded region NFA 1. When the display panel 10 is folded in a dumbbell shape as shown in fig. 7, the first curvature changing region IA1 may represent a region in which the direction of the curved surface of the display panel 10 changes. That is, the display panel 10 may start to be bent in the concave direction in the folding area FA (specifically, the curvature area CV) and the first extension area EX1, and may start to be bent in the convex direction in the first curvature changing area IA 1.
The middle graph of fig. 7 exemplarily shows the rate of change (i.e., dy/dx or y') of the deflection in the y direction of the display panel 10 with respect to the deflection in the x direction in the curvature region CV, the first extension region EX1, and the first non-folding region NFA1 when the display panel 10 is folded. This may correspond to the slope at which the display panel 10 is bent in fig. 7. The slope dy/dx may be- ++at the center of the curvature region CV, it is possible to gradually increase along the first extension region EX1 from one end of the curvature region CV through 0. Further, the slope dy/dx may have a maximum value of the slope at the connection point of the first extension region EX1 and the first non-folding region NFA1, and may converge to 0 along the first non-folding region NFA 1. At this time, a point having the maximum value of the slope (for example, a boundary point of the first extension region EX1 and the first non-folding region NFA 1) may be defined as the first curvature change point IP1. The first curvature change point IP1 may be included in the first curvature change region IA 1. In other words, the first extension region EX1 and the first non-folded region NFA1 may be divided based on the first curvature change point IP1, and the first curvature change region IA1 may overlap with a portion of the first extension region EX1 and a portion of the first non-folded region NFA 1.
Further, the lower graph of fig. 7 exemplarily shows a change rate (i.e., d) of the slope of the display panel 10 when the display panel 10 is folded 2 y/dx 2 Or y "). This may be the differential value of slope dy/dx to x or in the y-directionThe second order differential value for x. Rate of change of slope d 2 y/dx 2 At the center of the curvature region CV may be ≡, gradually decreasing along one end of the curvature region CV and the first extension region EX 1. At this time, the change rate d of the slope 2 y/dx 2 The change from positive to negative may be made with reference to the first curvature change point IP 1. That is, at the first curvature change point IP1, the change rate d of the slope 2 y/dx 2 May be 0.
In general, as the display device 1 includes a plurality of layers (e.g., a protective film layer, a cushion layer, a digitizer layer, etc.), the thickness of the display device 1 including the display panel 10 may become thicker, and thus in the case where the display device 1 is folded (particularly, folded in a dumbbell shape), the folding curvature R may decrease in the folding area FA. As described above, in the case where the folding curvature R is reduced, the stress to which the cover window CW of the display module 20 and/or the display panel 10 is subjected due to bending may be increased, and thus a crack (ack) may be generated.
Referring again to fig. 5 to 7, the display device 1 according to an embodiment of the present invention may include a space portion 80 disposed in the curvature changing region IA. The space portion 80 may include an internal empty space between the display panel 10 and the second layer 40.
In an embodiment, the space 80 may be disposed in the first layer 30 in the curvature changing region IA. That is, the space portion 80 may include a first space portion 81 disposed in the first curvature changing region IA1 and a second space portion 82 disposed in the second curvature changing region IA 2. The first space portion 81 and the second space portion 82 are similar, and therefore, for convenience of explanation, the explanation will be made centering on the first space portion 81.
The first layers 30 may be configured to be spaced apart in a first direction (e.g., x-direction of fig. 5) so as to form a space in the first curvature varying region IA1, and a periphery of the first space portion 81 may be defined by the spaced apart first layers 30. The first space portion 81 may be formed to extend along the second direction (e.g., the y-direction of fig. 5) in the first curvature varying region IA 1. That is, the first space portion 81 may be formed in parallel with the extending direction of the folding axis FAX. At this time, a cross section of the first space portion 81 taken in the first direction (for example, the x-direction of fig. 5) may be a quadrangular shape. However, without being limited thereto, the first space portion 81 may be formed in a tapered shape such that the width of the first space portion 81 gradually becomes wider or narrower in the thickness direction (for example, the z direction of fig. 5), and it should be understood that a cross section of other shapes may be formed within the spirit of the present invention.
Further, in an embodiment, the first space portion 81 may be configured to be symmetrical about the first curvature change point IP 1. That is, as shown in fig. 5, in the first space portion 81, the length extending toward the folded area FA with the first curvature changing point IP1 as the center and the length extending toward the first non-folded area NFA1 may be the same.
The display device 1 according to an embodiment of the present invention includes the space portion 80 arranged in the first layer 30, so that the folding curvature R of the display device 1 can be maintained. Specifically, as shown in fig. 6, in the curvature changing region IA, the entire thickness of the display panel 10, the cover window CW, the first layer 30, the second layer 40, and the third layer 50 may be thinner than other portions due to the space formed by the space portion 80. Thereby, the space formed by the space portion 80 can be utilized, and each layer can be better bent in the curvature changing region IA, whereby the angle between the first extension region EX1 and the second extension region EX2 can become larger. Even if the layers are disposed at the lower portion of the display panel 10, the folding curvature R can be maintained larger than that in the case where the space portion 80 is not provided. Accordingly, the display device 1 can reduce stress concentration due to folding in the folding area FA, and can prevent cracks from occurring in the layers of the cover window CW, the display panel 10, and the like.
Fig. 8 to 11 are cross-sectional views schematically showing display devices according to various embodiments of the present invention. Fig. 8 to 11 show a state in which the display device 1 is unfolded similarly to fig. 5. In the present embodiment, the display device 1 is similar to the display device 1 described above, and therefore, the following description will focus on differences. Since the first space 81 and the second space 82 are similar, the first space 81 will be mainly described below for convenience of explanation.
Referring to fig. 8, as an embodiment, in the first curvature changing region IA1, the first space portion 81 may be formed only in a part of the thickness of the first layer 30. As shown in fig. 8, the first space portion 81 may be formed only in a part of the thickness of the first layer 30 in such a manner that a space is formed at a surface in contact with the second layer 40. Thereby, the first space portion 81 having a shape recessed from the lower surface (surface in the-z direction of fig. 8) of the first layer 30 can be formed. In other embodiments, the first space portion 81 may be formed only in a portion of the thickness of the first layer 30 in such a manner that a space is formed at a surface in contact with the third layer 50. Thereby, the first space portion 81 having a shape recessed from the upper surface (surface in the z direction of fig. 8) of the first layer 30 can be formed. Hereinafter, for convenience of explanation, a case will be described centering on the formation of the first space 81 in a shape recessed from the lower surface of the first layer 30 as shown in fig. 8.
Referring to fig. 9, in an embodiment, a cross section of the first space portion 81 taken in the first direction (e.g., the x-direction of fig. 9) may be a semi-elliptical or semi-circular shape. At this time, as described previously, the first space portion 81 may be configured to be symmetrical about the first curvature change point IP1, whereby the height of the first space portion 81 in the z direction of fig. 9 may be maximum at the first curvature change point IP 1. In other words, in the z-direction of fig. 9, the thickness of the first layer 30 may be smallest at the first curvature change point IP 1. The first space portion 81 is formed such that the thickness of the first layer 30 becomes minimum at the first curvature changing point IP1, so that in the first curvature changing region IA1, each layer including the display panel 10 can be better curved centering on the first curvature changing point IP1, whereby the folded curvature R can be further ensured.
Further, the cross-section of the first space portion 81 is formed in a semi-elliptical shape or a semi-circular shape, so that stress concentration that may occur at the corner of the first space portion 81 can be dispersed when the first layer 30 including the first space portion 81 is folded.
Referring to fig. 10, in an embodiment, a cross section of the first space portion 81 taken in the first direction (e.g., the x-direction of fig. 10) may be in the shape of a concave-convex. At this time, as described above, the first space portion 81 may be configured to be symmetrical about the first curvature changing point IP 1. In the case described above, the thickness of the first layer 30 can be maintained at a certain level or more in the first curvature changing region IA1, so that rigidity at a certain level or more can be ensured, and the effect of increasing the folding curvature R by the first space portion 81 can be obtained.
Referring to fig. 11, in an embodiment, the first space part 81 may be provided in plurality. The plurality of first space portions 81 may respectively extend in the second direction (e.g., the y-direction of fig. 11) as described above, and the plurality of first space portions 81 may be configured to be spaced apart in the first direction (e.g., the x-direction of fig. 11). At this time, as described above, the plurality of first space portions 81 may be formed through the entire thickness of the first layer 30, respectively. That is, the plurality of first space portions 81 may be formed to penetrate the first layer 30, respectively. However, in other embodiments, similarly to the foregoing embodiments, it should be understood that the plurality of first space portions 81 may be formed via a portion of the thickness of the first layer 30, respectively. Further, the plurality of first space portions 81 may be arranged to be symmetrical about the first curvature changing point IP1 as described above.
Fig. 12 is a cross-sectional view schematically showing a display device according to still another embodiment of the present invention. Fig. 12 shows a state in which the display device 1 is unfolded, similarly to fig. 5. In the present embodiment, the display device 1 is similar to the display device 1 described above, and therefore, the following description will focus on differences. Since the first space 81 and the second space 82 are similar, the first space 81 will be mainly described below for convenience of explanation.
Referring to fig. 12, as described with reference to fig. 5, in the first curvature changing region IA1, the first space 81 may be disposed through the entire thickness of the first layer 30. At this time, the first layer 30 may be different in substance disposed in the folded area FA and the first unfolded area NFA1 with reference to the first curvature changing area IA 1. In other words, it can be said that the first layer 30 differs in substance disposed in the folded region FA and the first non-folded region NFA1 with reference to the first space portion 81. Specifically, in the first layer 30, a first protective member 31 may be disposed in the folded region FA, and a second protective member 32 different from the first protective member 31 may be disposed in the first non-folded region NFA 1. In an embodiment, the rigidity of the second protection member 32 may be greater than the rigidity of the first protection member 31. Thus, the first layer 30 can be more flexibly bent in the folded area FA that is folded, and the support function can be enhanced by greater rigidity in the first unfolded area NFA1 that is not folded.
Fig. 13 to 15 are diagrams schematically showing a method of manufacturing a display device according to an embodiment of the present invention.
Referring to fig. 13, the display panel 10 may be prepared. At this time, the cover window CW may be attached to the display panel 10. The third layer 50 may be disposed on a surface of the display panel 10 (for example, a surface in the-z direction in fig. 13) facing the display surface. At this time, in an embodiment, the third layer 50 may be attached to the display panel 10 by an adhesive member. The third layer 50 may be, for example, a protective film layer or a support sheet layer.
Referring to fig. 14, the first layer 30 may be disposed at a lower face (e.g., a face in the-z direction of fig. 14) of the third layer 50. At this time, in an embodiment, the first layer 30 may be attached to the third layer 50 by an adhesive member. The first layer 30 may be attached in spaced apart relation as previously described to form the space 80. Further, in an embodiment, the first layer 30 may be configured to be spaced apart with reference to the center of the folding area FA so as to be cut at the center of the folding area FA when folded. The first layer 30 may be, for example, a cushion layer.
Referring to fig. 15, a second layer 40 may be disposed on a lower face (e.g., a face in the-z direction of fig. 15) of the first layer 30. At this time, in an embodiment, the second layer 40 may be attached to the first layer 30 by an adhesive member. In an embodiment, the second layer 40 may be configured to be spaced apart with reference to the center of the folding area FA so as to be cut at the center of the folding area FA when folded. The second layer 40 may be, for example, a digitizer layer.
A method of manufacturing a display device according to an embodiment of the present invention may be a method for manufacturing the aforementioned display device 1. In the foregoing embodiment, the description has been made centering on the case where the space portion 80 is arranged in the first layer 30 in the curvature changing region IA, but the present invention is not limited to this, and for example, the space portion 80 may be arranged in the third layer 50 or may be arranged to form a space over the entire thickness of the first layer 30 and a part of the thickness of the third layer 50. Alternatively, it should be appreciated that the space 80 may also be configured to form a space over a portion of the thickness of the first layer 30 and a portion of the thickness of the third layer 50.
As described above, the present invention is explained with reference to the illustrated embodiment, but this is merely an illustration. It will be appreciated by those skilled in the art that various modifications and other embodiments may be made from the embodiments, as well as equivalents. Therefore, the true technical scope of the present invention should be determined based on the claims.
Claims (20)
1. A display device, comprising:
a display module including a folding region and curvature change regions disposed at both sides of the folding region in a first direction;
a first layer disposed on a surface of the display module facing the display surface; and
a second layer disposed on a surface of the first layer facing the display module,
in the curvature change region, an empty space is formed between the display module and the second layer in the thickness direction.
2. The display device according to claim 1, wherein,
the first layer includes a space portion forming the empty space at a lower portion of the curvature varying region.
3. The display device according to claim 2, wherein,
the space portion has a quadrangular or semi-elliptic cross section taken in the first direction or includes irregularities.
4. The display device according to claim 2, wherein,
The space portion is provided in plurality, and the plurality of space portions is arranged to be spaced apart along the first direction.
5. A display device according to claim 2 or 3, wherein,
the space portion is disposed through the entire thickness of the first layer.
6. A display device according to claim 2 or 3, wherein,
the space portion is disposed via a portion of the thickness of the first layer.
7. The display device according to claim 1 or 2, wherein,
in the first layer, a first protective member is disposed in the folded region based on the curvature change region, and a second protective member different from the first protective member is disposed on the opposite side of the folded region.
8. The display device according to claim 7, wherein,
the second protective member has a rigidity greater than that of the first protective member.
9. A display device according to claim 2 or 3, wherein,
the curvature change region includes a curvature change point that is a point at which a change rate of a slope of the display module changes from positive to negative or from negative to positive along the first direction when the display module is folded,
the space portion is configured to be symmetrical with respect to the curvature change point.
10. The display device according to claim 9, wherein,
for the space portion, at the curvature change point, the height of the space portion in the thickness direction becomes maximum.
11. The display device according to claim 1 or 2, wherein,
the first layer and the second layer are configured to be slit in the center of the folded region.
12. The display device according to claim 1 or 2, wherein,
the second layer is a digitizer layer.
13. A method of manufacturing a display device, comprising:
a step of preparing a display module including a folding region and curvature change regions arranged on both sides of the folding region in a first direction;
a step of disposing a first layer including a space portion on a surface of the display module facing the display surface so as to form an empty space in a lower portion of the curvature changing region; and
and disposing a second layer on a surface of the first layer facing the display module.
14. The method for manufacturing a display device according to claim 13, wherein,
the space portion has a quadrangular or semi-elliptic cross section taken in the first direction or includes irregularities.
15. The method for manufacturing a display device according to claim 13 or 14, wherein,
the space portion is formed via a portion of the thickness of the first layer.
16. The method for manufacturing a display device according to claim 13 or 14, wherein,
the step of configuring the first layer comprises: and disposing a first protective member in the folded region of the first layer based on the curvature change region and disposing a second protective member different from the first protective member on an opposite side of the folded region.
17. The method for manufacturing a display device according to claim 16, wherein,
the second protective member has a rigidity greater than that of the first protective member.
18. The method for manufacturing a display device according to claim 13 or 14, wherein,
the curvature change region includes IPA2302KR0072 as a point at which a change rate of a slope of the display module changes from positive to negative or vice versa along the first direction when the display module is folded
The point of change of curvature is referred to as the point of change of curvature,
the space portion is configured to be symmetrical with respect to the curvature change point.
19. The method for manufacturing a display device according to claim 18, wherein,
The step of configuring the first layer comprises: a step of configuring at the curvature change point such that the thickness of the first layer becomes minimum.
20. The method for manufacturing a display device according to claim 13 or 14, wherein,
the second layer is a digitizer layer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2022-0059850 | 2022-05-16 | ||
| KR1020220095030A KR20230160680A (en) | 2022-05-16 | 2022-07-29 | Display appratus and method for manufacturing display apparatus |
| KR10-2022-0095030 | 2022-07-29 |
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| Publication Number | Publication Date |
|---|---|
| CN117079540A true CN117079540A (en) | 2023-11-17 |
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| CN202310533467.1A Pending CN117079540A (en) | 2022-05-16 | 2023-05-12 | Display device and method for manufacturing display device |
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