阅读说明：本技术 柔性显示设备 (Flexible display device ) 是由 岸本广次 崔哲浩 黄铉彬 郑哲豪 于 2021-04-14 设计创作，主要内容包括：公开了包括弯曲区域和多个非弯曲区域的柔性显示设备,该柔性显示设备可以包括：显示基板,包括多个晶体管和发光元件；感测膜,位于显示基板下方；以及多个金属板,位于感测膜下方,并且金属板包括软磁材料。(Disclosed is a flexible display device including a bending region and a plurality of non-bending regions, which may include: a display substrate including a plurality of transistors and light emitting elements; a sensing film located under the display substrate; and a plurality of metal plates located below the sensing film, and the metal plates including a soft magnetic material.)

1. A flexible display device comprising a curved region and a plurality of non-curved regions, the flexible display device comprising:

a display substrate including a plurality of transistors and light emitting elements;

a sensing film located under the display substrate; and

a plurality of metal plates located under the sensing membrane,

wherein the metal plate comprises a soft magnetic material.

2. The flexible display device of claim 1, wherein:

the plurality of non-bending regions includes a first non-bending region and a second non-bending region, the bending region is located between the first non-bending region and the second non-bending region, and

the plurality of metal plates includes a first metal plate configured to overlap the first non-bending region and a second metal plate configured to overlap the second non-bending region.

3. The flexible display device according to claim 2, wherein the respective facing ends of the first and second metal plates are in contact with each other in a state in which the flexible display device is unfolded.

4. A flexible display device according to claim 3, wherein said respective facing ends overlap said bending region.

5. The flexible display device of claim 2, wherein the plurality of metal plates further comprises a third metal plate positioned below the first metal plate.

6. The flexible display device of claim 5, wherein the respective facing ends of the first and second metal plates are spaced apart from each other by a space in an unfolded state of the flexible display device.

7. The flexible display device of claim 5, wherein an end of the third metal plate overlaps at least a portion of the second metal plate.

8. The flexible display device of claim 5, wherein the plurality of metal plates further comprises a fourth metal plate positioned below the second metal plate.

9. The flexible display device of claim 1, wherein the sensing film comprises:

a base film;

a first sensing electrode on the base film;

the insulating layer is positioned on the first sensing electrode; and

and the second sensing electrode is positioned on the insulating layer.

10. The flexible display device according to claim 1, wherein the flexible display device has a repulsive force with a strength of from 14N cm to 20N cm at room temperature.

11. The flexible display device of claim 1, wherein each of the plurality of metal plates has a thickness of 20 μ ι η to 150 μ ι η.

12. The flexible display device of claim 1, wherein the sensing film overlaps all of the curved region and the plurality of non-curved regions.

13. The flexible display device of claim 1, wherein the sensing film is configured to recognize an input of an electronic pen.

14. The flexible display device of claim 1, wherein the soft magnetic material comprises invar, ferritic stainless steel, permalloy, permvar, or permendur.

15. A foldable flexible display device comprising:

a display substrate including a plurality of transistors and light emitting elements;

a sensing film located under the display substrate; and

at least one metal plate located below the sensing membrane.

16. The flexible display device of claim 15, wherein the at least one metal plate comprises a grid area having a grid pattern defined therein.

17. The flexible display device of claim 16, wherein the grid area has a width of 2mm to 20 mm.

18. The flexible display device of claim 16, further comprising an additional metal plate located below the at least one metal plate,

wherein the additional metal plate overlaps the mesh area in a state in which the flexible display device is unfolded.

19. The flexible display device of claim 16, further comprising a touch sensing layer on the display substrate.

20. The flexible display device of claim 19, further comprising:

a wavelength conversion pattern on the touch sensing layer and including quantum dots; and

a color filter on the wavelength conversion pattern.

Technical Field

Aspects of embodiments of the present disclosure relate to a flexible display device.

Background

With the development of an information-oriented society, demands for display devices displaying images are increasing in various forms. Recently, various flat panel display devices, such as a liquid crystal display device, a plasma display device, an organic light emitting diode display device, an electrophoretic display device, a micro Light Emitting Diode (LED) display device, and a display device including inorganic light emitting elements, such as quantum dot LEDs, have been used. In particular, since at least some of the above-described display devices may be implemented as a flat panel, research into a technique for implementing a corresponding display device as a flexible display device having flexibility has been continuously conducted.

The touch panel is an input device that inputs a user's command by allowing an instruction displayed on a screen of a display apparatus or the like to be selected with an object or a finger of the user. Since such a touch panel can replace separate input devices, such as a keyboard and a mouse, which are operated when coupled to a display apparatus, the range of use of the touch panel has been gradually expanded.

In general, a touch panel may recognize a touch in a capacitance scheme, which is a scheme for detecting a change in capacitance and recognizing a contact position when an object or a finger of a user is in contact with a surface of the touch panel.

Meanwhile, there is a disadvantage in that when a user's finger is in contact with the surface of the touch panel and then a touch is recognized, the touch position may not be precisely recognized. To solve this disadvantage, research into an electronic pen (or a stylus pen) and a digitizer for recognizing the electronic pen is actively conducted.

Recently, a digitizer in which a magnetic metal plate and a digitizer module provided on the magnetic metal plate are arranged has been applied to a display device.

Disclosure of Invention

According to an aspect of one or more embodiments of the present disclosure, a foldable flexible display device is provided. According to another aspect of one or more embodiments of the present disclosure, there is provided a flexible display device including a digitizer for recognizing an electronic pen.

However, aspects of the present disclosure are not limited to the above-described aspects, and other aspects not described herein may be clearly understood by those skilled in the art from the following description.

According to one or more embodiments of the present disclosure, a flexible display device includes a bending region and a plurality of non-bending regions. The flexible display device may include: a display substrate including a plurality of transistors and light emitting elements; a sensing film located under the display substrate; and a plurality of metal plates located below the sensing film, wherein the metal plates include a soft magnetic material.

The plurality of non-bending regions may include a first non-bending region and a second non-bending region, the bending region is located between the first non-bending region and the second non-bending region, and the plurality of metal plates may include a first metal plate configured to overlap the first non-bending region and a second metal plate configured to overlap the second non-bending region.

In a state where the flexible display device is unfolded, the respective facing ends of the first and second metal plates may contact each other.

The respective facing ends may overlap the bending region.

The plurality of metal plates may further include a third metal plate positioned below the first metal plate.

In a state in which the flexible display device is unfolded, the respective facing ends of the first and second metal plates may be spaced apart from each other by a space.

One end of the third metal plate may overlap at least a portion of the second metal plate.

The plurality of metal plates may further include a fourth metal plate positioned below the second metal plate.

The sensing film may include a base film, a first sensing electrode on the base film, an insulating layer on the first sensing electrode, and a second sensing electrode on the insulating layer.

The flexible display device may have a repulsive force with a strength of from 14N cm to 20N cm at room temperature.

Each of the plurality of metal plates may have a thickness of 20 μm to 150 μm.

The sensing film may overlap all of the curved region and the plurality of non-curved regions.

The sensing film may be configured to recognize an input of the electronic pen.

The soft magnetic material may comprise invar, ferritic stainless steel, Permalloy (Permalloy), permivar (permivar), or Permendur (permendar).

According to one or more embodiments of the present invention, a foldable flexible display device may include: a display substrate including a plurality of transistors and light emitting elements; a sensing film located under the display substrate; and at least one metal plate located under the sensing film.

The at least one metal plate may include a mesh region having a mesh pattern defined therein.

The grid area may have a width of 2mm to 20 mm.

The flexible display device may further include an additional metal plate positioned under the at least one metal plate, wherein the additional metal plate overlaps the mesh area in a state where the flexible display device is unfolded.

The flexible display device may further include a touch sensing layer on the display substrate.

The flexible display device may further include a wavelength conversion pattern on the touch sensing layer and including quantum dots, and a color filter on the wavelength conversion pattern.

Other features and aspects of the embodiments are included in the following detailed description and the accompanying drawings.

According to an aspect of an embodiment of the present disclosure, a flexible display device may include a digitizer module.

In addition, the flexible display device may include a digitizer module not separately having a magnetic metal plate.

Further, the flexible display device can be easily bent because an increase in repulsive force is minimized or reduced even if the digitizer module is included.

However, the aspects and effects according to the embodiments are not limited by the above aspects and effects, and various aspects and effects are included in the present specification.

Drawings

Fig. 1 is a view illustrating a flexible display device and an electronic pen according to an embodiment of the present disclosure.

Fig. 2 and 3 are views illustrating a state in which the flexible display device of fig. 1 is folded.

Fig. 4A is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Fig. 4B is a sectional view showing an application example of fig. 4A.

Fig. 4C is a sectional view showing an application example of fig. 4A.

Fig. 5 is a cross-sectional view illustrating the display substrate of fig. 4A.

Fig. 6 is a sectional view illustrating the sensing membrane of fig. 4A.

Fig. 7 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Fig. 8 is a cross-sectional view illustrating the display substrate and the touch sensing layer of fig. 7.

Fig. 9 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Fig. 10 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Fig. 11 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Fig. 12 is a schematic perspective view of the sensing film of fig. 11 for explaining a plane of the sensing film.

Fig. 13 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Fig. 14 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Fig. 15 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Detailed Description

Aspects and features of the present disclosure and methods for implementing the present disclosure will become apparent with reference to some exemplary embodiments described in further detail in connection with the accompanying drawings. However, the present disclosure may be implemented in various forms without being limited to the embodiments described herein, and the embodiments of the present disclosure are intended to complete the disclosure of the inventive concept and to provide those skilled in the art to which the present disclosure pertains to help clearly understand the scope of the present disclosure. The technical scope of the present disclosure should be defined by the technical spirit of the claims.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting of the disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "comprises" or "comprising" and/or "includes" or "including" and/or "having" and variations thereof, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

The case where a first element or layer is designated as being disposed "on" or "over" a second element or layer may include all cases where the first element or layer is disposed directly on the second element or layer and all cases where one or more additional elements or layers are interposed between the first element or layer and the second element or layer. Similarly, a first element or layer designated as being disposed "under" a second element or layer may include all those elements or layers in which the first element or layer is disposed directly under the second element or layer and all those elements or layers in which one or more additional elements or layers are interposed between the first element or layer and the second element or layer. Further, the terms "above" and "below" are not limited to particular terms and may specify positions relative to one another.

Although the terms "first" and "second" are used to describe various components, it should be understood that these components are not limited by these terms. These terms are used to distinguish one element from another. Accordingly, it is to be understood that the first component to be described below may also be the second component without departing from the technical spirit of the present disclosure.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the inventive concepts belong. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Herein, some embodiments of the present disclosure will be described with reference to the accompanying drawings. Throughout the drawings, the same or similar reference numerals are used to designate the same or similar components. In addition, in the drawings, the size or thickness of various components may be exaggerated for the sake of brevity and clarity.

Fig. 1 is a view illustrating a flexible display device and an electronic pen according to an embodiment of the present disclosure; and fig. 2 and 3 are views illustrating a state in which the flexible display device of fig. 1 is folded. Meanwhile, fig. 1 shows a state in which the flexible display device is spread (unfolded) such that the display surface thereof is laid flat.

The flexible display device 1 shown in fig. 1 to 3 shows a foldable display device by way of example. However, the shape of the flexible display device 1 is not limited to the shape shown in fig. 1, and the spirit and scope of the present disclosure may be applied to the flexible display device 1 as long as the flexible display device 1 is a display device including a portion in which a tensile force or a compressive force is generated by bending (or folding). In other words, the spirit and scope of the present disclosure may also be applied to bendable display devices and rollable display devices.

Herein, an organic light emitting display device will be described as an example of the display device. However, the present disclosure is not limited thereto, but may be applied to other display devices, such as a liquid crystal display device, a field emission display device, an electrophoretic display device, a quantum dot light display device, or a micro LED display device, as long as the spirit of the present disclosure is not changed.

Referring to fig. 1, in the flexible display device 1, a display surface IS on which an image IS displayed may be parallel to a surface defined by a first direction DR1 and a second direction DR 2. The normal direction of the display surface IS (i.e. the thickness direction of the flexible display device 1) IS indicated by the third direction DR 3. The top (or top surface) and the bottom (or bottom surface) of each of the elements may be distinguished from each other by the third direction DR 3.

In the present specification, the first direction DR1, the second direction DR2, and the third direction DR3 may be orthogonal to each other, and may correspond to an x-axis direction, a y-axis direction, and a z-axis direction, respectively. However, the directions indicated by the first direction DR1, the second direction DR2, and the third direction DR3 may be opposite to each other, and may be changed to other directions.

In an embodiment, the flexible display device 1 may comprise a plurality of regions defined according to its operational form. The flexible display device 1 according to the embodiment may include a bending region BA, which may be bent based on a virtual bending axis BX (see fig. 1 to 3), and non-bending regions NBA1 and NBA2, which are not bent.

The flexible display device 1 may comprise at least one curved area BA and one or more non-curved areas NBA1 and NBA 2. Although the case where the flexible display device 1 includes one bending area BA and two non-bending areas NBA1 and NBA2 is shown in fig. 1, the embodiment is not limited thereto. In other words, the present embodiment shows an example in which the flexible display device 1 includes the bent region BA and the first and second non-bent regions NBA1 and NBA2 with the bent region BA interposed between the first and second non-bent regions NBA1 and NBA 2. In other embodiments, the flexible display device 1 may include a plurality of bending areas BA. In some embodiments, the flexible display device 1 may comprise three or more non-curved regions.

In an embodiment, in the flexible display device 1, the bending area BA and the non-bending areas NBA1 and NBA2 may be arranged to be coupled to each other. For example, the non-bending regions NBA1 and NBA2 may be arranged on both sides of the bending region BA.

The display surface IS of the flexible display device 1 may comprise a plurality of areas. The display surface IS may include a display area DA in which an image IS displayed and a non-display area NDA adjacent to the display area DA.

The display area DA may be defined by each light emitting element, and may include a plurality of light emitting areas (not shown) that are areas emitting light at respective designated colors. Further, the display area DA may also be used as a detection member that detects an external environment.

The non-display area NDA is an area in which an image is not displayed. In an embodiment, the display area DA may have a rectangular shape. In an embodiment, the non-display area NDA may be disposed to surround the display area DA on a plane. Further, although not shown in the drawings, a speaker module, a camera module, a sensor module, and the like may be disposed in the non-display area NDA or may not be disposed in the non-display area NDA. Here, the sensor module may include at least one of an illumination sensor, a proximity sensor, an infrared sensor, and an ultrasonic sensor.

However, the embodiment is not limited thereto, and the shapes of the display area DA and the non-display area NDA may relatively vary.

The display direction of the image may be defined as the direction of the normal of the display surface IS. In an embodiment, the display direction may be the same direction as the third direction DR 3.

The flexible display device 1 is bendable. In an embodiment, the flexible display device 1 may be a foldable display device. In some embodiments, the flexible display device 1 may be folded inwards or outwards.

In the embodiment, the bending axis BX may be an axis in the second direction DR2, but may be variously changed without being limited thereto. In an embodiment, the radius of curvature may be equal to or greater than 1mm and less than or equal to 5mm in a state where the flexible display device 1 is bent (or folded).

The flexible display device 1a shown in fig. 2 represents an inwardly folded state in which the display surface IS positioned inwardly. When the flexible display device 1a IS folded inward, the bending axis BX may be formed on the top of the display surface IS.

The flexible display device 1b shown in fig. 3 represents an outward folded state in which the display surface IS positioned outward. When the flexible display device 1b IS folded outward, the bending axis BX may be formed on the bottom of the display surface IS.

The flexible display device 1 may be configured to be folded inward or outward in one bending area BA, but the embodiment thereof is not limited thereto. Herein, description will be made based on a state in which the flexible display device 1 is folded inward in the bending area BA, and a coupling relationship between components provided in the flexible display device 1 in a state in which the flexible display device 1 is unfolded will be described.

The flexible display device 1 may recognize the electronic pen 2. The electronic pen 2 may be an input means of the flexible display device 1.

When the electronic pen 2 touches the surface of the flexible display device 1 or approaches the flexible display device 1 within a certain distance (e.g., a predetermined distance), input information may be provided to a sensing film included in the flexible display device 1. Here, the input information may contain information about the position of the electronic pen 2 on the flexible display device 1, the touch intensity of the electronic pen 2 (i.e., the surface pressure on the flexible display device 1), and the like. In other words, the sensing film may comprise the functionality of a conventional digitizer. In an embodiment, the electronic pen 2 may be a stylus pen. The sensing film will be described in further detail later with reference to fig. 4A and 6.

The electronic pen 2 may be driven using any of various methods, such as electromagnetic resonance (EMR) and Active Electrostatic Solution (AES).

The electromagnetic resonance (EMR) may include a scheme in which the electronic pen 2 generates electromagnetic resonance by a magnetic field generated in the flexible display device 1, and in which a signal such as coordinates of the electronic pen 2 is then supplied to the flexible display device 1. In more detail, when a magnetic field is generated by a sensing film or the like included in the flexible display device 1, electromagnetic resonance is generated in the electronic pen 2 entering a range of the magnetic field, and thus, energy depending on the electromagnetic resonance is supplied to the electronic pen 2. The electronic pen 2 supplied with power may output a radio signal through an internal circuit. In this case, the sensing film may receive signals output from the electronic pen 2 at various points, measure the intensity of the received signals, calculate a point closest to the electronic pen 2 based on the intensity, and then detect the position of the electronic pen 2.

The Active Electrostatic Solution (AES) may include a scheme in which the electronic pen 2 induces static electricity and the sensing film recognizes the static electricity, thereby sensing coordinates, pressure, etc. of the electronic pen 2.

An existing known electronic pen may be used as the electronic pen 2.

Fig. 4A is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure;

fig. 4B is a sectional view showing an application example of fig. 4A; fig. 4C is a sectional view showing an application example of fig. 4A; fig. 5 is a cross-sectional view illustrating the display substrate of fig. 4A; and fig. 6 is a sectional view illustrating the sensing membrane of fig. 4A. In addition, fig. 4A is an exemplary sectional view taken along line I-I' in fig. 1. Herein, the thicknesses and the like of the respective components of the flexible display device 1 may be slightly exaggerated as shown in the drawings for convenience of description.

Referring to fig. 4A, in an embodiment, the flexible display device 1 may include a display substrate 10, an anti-reflection member 20, a window unit 30, a film unit 40, a pad unit 50, a sensing film 60, a plurality of metal plates 70, and a plurality of adhesive members 80. Although the components are described in this specification as being sequentially stacked in one direction as shown in the drawings, it is apparent that the positions of the components may be partially changed or additional components may be interposed between the components.

Herein, the term "top" means a relative position in the same direction as the third direction DR3, and the term "bottom" means a relative position in the opposite direction to the third direction DR 3. Further, herein, a corresponding component formed by a continuous process with another component is referred to as a "layer" or a "film", and a component coupled to another component by an adhesive member is referred to as a "unit".

First, the display substrate 10 is described with reference to fig. 4A together with fig. 5.

A plurality of transistors TR and light emitting elements 120 may be provided in the display substrate 10.

The display substrate 10 may include a base substrate 103 disposed in a lower portion of the display substrate 10. The base substrate 103 may be a flexible substrate. In an embodiment, for example, the base substrate 103 may be a film substrate or a plastic substrate including a polymer organic material. For example, the base substrate 103 may include any one of materials such as polystyrene, polyvinyl alcohol, polymethyl methacrylate, polyether sulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, cellulose triacetate, and cellulose acetate propionate. In an embodiment, the base substrate 103 may include a glass Fiber Reinforced Plastic (FRP).

The base substrate 103 may be provided thereon with a buffer layer 111. The buffer layer 111 serves to smooth the surface of the base substrate 103 and prevent or substantially prevent moisture or external air from penetrating into the base substrate 103. The buffer layer 111 may be an inorganic layer. The buffer layer 111 may have a single-layer structure or a multi-layer structure.

A plurality of transistors TR may be disposed on the buffer layer 111. Here, the illustrated transistor TR may be a driving transistor. One or more transistors TR may be provided in each pixel. Each transistor TR may include a semiconductor layer CH, a gate electrode GE, a source electrode SE, and a drain electrode DE.

The semiconductor layer CH may be disposed on the buffer layer 111. In an embodiment, the semiconductor layer CH may include any one of amorphous silicon, polycrystalline silicon, and an organic semiconductor. In other embodiments, the semiconductor layer CH may be an oxide semiconductor. Although not shown in the drawings, the semiconductor layer CH may include a channel region and source and drain regions disposed on both sides of the channel region and doped with impurities.

The semiconductor layer CH may be provided thereon with a gate insulating layer 112. The gate insulating layer 112 may be an inorganic layer. The gate insulating layer 112 may have a single-layer structure or a multi-layer structure.

The gate electrode GE may be disposed on the gate insulating layer 112. The gate electrode GE may be formed of a metal material having conductivity. For example, the gate electrode GE may include any one of molybdenum (Mo), aluminum (Al), copper (Cu), titanium (Ti), and the like. The gate electrode GE may have a single-layer structure or a multi-layer structure.

An interlayer insulating layer 113 may be disposed on the gate electrode GE. The interlayer insulating layer 113 may be an inorganic layer. The interlayer insulating layer 113 may have a single-layer structure or a multi-layer structure.

The source electrode SE and the drain electrode DE may be disposed on the interlayer insulating layer 113. Each of the source electrode SE and the drain electrode DE may be formed of a metal material having conductivity. For example, each of the source electrode SE and the drain electrode DE may include any one of aluminum (Al), copper (Cu), titanium (Ti), and molybdenum (Mo).

The source electrode SE and the drain electrode DE may be electrically coupled to a source region and a drain region of the semiconductor layer CH, respectively, through contact holes penetrating the interlayer insulating layer 113 and the gate insulating layer 112.

Although not shown in the drawings, the display substrate 10 may further include a storage capacitor and a switching transistor on the base substrate 103.

A protective layer 114 may be disposed on the source electrode SE, the drain electrode DE, and the interlayer insulating layer 113. Here, the protective layer 114 may be disposed to cover the pixel circuit components including the transistor TR. The protective layer 114 may be a passivation layer or a planarization layer. The passivation layer may include SiO₂、SiN_xEtc., and the planarization layer may include a material such as acryl or polyimide. In an embodiment, the protective layer 114 may include both a passivation layer and a planarization layer. In this case, a passivation layer may be disposed on the source electrode SE, the drain electrode DE, and the interlayer insulating layer 113, and a planarization layer may be disposed on the passivation layer.

The top surface of the protective layer 114 may be planar. However, the top surface of the protective layer 114 is not limited thereto, and may not be planar. Further detailed description thereof will be provided later herein.

A plurality of first electrodes 121 may be disposed on the protective layer 114. Such a first electrode 121 may be a pixel electrode disposed in each pixel. In an embodiment, the first electrode 121 may be an anode electrode of an organic light emitting diode.

As shown in fig. 5, the first electrode 121 may be electrically coupled to the drain electrode DE disposed on the base substrate 103 through a through hole penetrating the protective layer 114, but the present invention is not limited thereto, for example, the first electrode 121 may be electrically coupled to the source electrode SE disposed on the base substrate 103 through a through hole penetrating the protective layer 114.

The first electrode 121 may be formed to include a material having a high work function. The first electrode 121 may include Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnO), indium oxide (In)₂O₃) And the like. The above-described conductive material has a transparent characteristic while having a relatively high work function. In an embodiment, when the organic light emitting display device is a top emission type display device, the first electrode 121 may include a reflective material such as 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 a mixture thereof, in addition to the conductive material described above. Accordingly, the first electrode 121 may have a single-layer structure composed of any one of the conductive materials and the reflective materials described above, or a multi-layer structure in which these layers are stacked.

The first electrode 121 may have a pixel defining layer 115 disposed thereon. The pixel defining layer 115 may include an opening through which at least a portion of the first electrode 121 is exposed. The pixel defining layer 115 may include an organic material or an inorganic material. In an embodiment, the pixel defining layer 115 may include any one of materials such as photoresist, polyimide resin, acrylic resin, silicon compound, and polyacrylic resin.

An organic light emitting layer 122 may be disposed on the first electrode 121 exposed by the pixel defining layer 115.

The organic emission layer 122 may be provided thereon with a second electrode 123. In an embodiment, the second electrode 123 may be a common electrode disposed on the entire area without distinguishing pixels. In an embodiment, the second electrode 123 may be a cathode electrode of an organic light emitting diode.

The second electrode 123 may be formed to include a material having a low work function. In an embodiment, the second electrode 123 may include Li, Ca, LiF/Al, Mg, Ag, Pt, Pd, Ni, Au, Nd, Ir, Cr, BaF, Ba, or compounds or mixtures thereof (e.g., a mixture of Ag and Mg, etc.). In an embodiment, the second electrode 123 may further include an auxiliary electrode. The auxiliary electrode may include a layer formed by depositing a corresponding material and a transparent metal oxide, such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide, formed on the layer.

In an embodiment, when the display substrate 10 is a top emission type display substrate, a conductive layer having a low work function may be formed as the second electrode 123 In a thin film shape, and a transparent conductive layer (e.g., an Indium Tin Oxide (ITO) layer, an Indium Zinc Oxide (IZO) layer, a zinc oxide (ZnO) layer, or an indium oxide (In)₂O₃) Layers) may be stacked on the second electrode 123.

The first electrode 121, the organic emission layer 122, and the second electrode 123 described above may form the organic light emitting diode 120 as a light emitting element.

In an embodiment, although not shown in the drawings, a hole injection layer and/or a hole transport layer may be interposed between the first electrode 121 and the organic light emitting layer 122, and an electron transport layer and/or an electron injection layer may be interposed between the organic light emitting layer 122 and the second electrode 123.

The second electrode 123 may have an encapsulation layer 116 disposed thereon. The encapsulation layer 116 includes an inorganic layer. In an embodiment, the encapsulation layer 116 may include a plurality of stacked layers. Although not shown in the drawings, the encapsulation layer 116 may be implemented as a multi-layer structure including a first inorganic layer, an organic layer, and a second inorganic layer sequentially stacked. In an embodiment, each of the first inorganic layer and the second inorganic layer may include a material selected from the group consisting of silicon oxide (SiO)_x) Silicon nitride (SiN)_x) And silicon oxynitride (SiON)_x) Group ofAnd the organic layer may include any one selected from the group consisting of epoxy resin, acrylate, and urethane acrylate.

The anti-reflection member 20 may be disposed on the display substrate 10. Referring to fig. 4B and 4C showing the flexible display devices 1' and 1 ″ together with fig. 4A, the anti-reflection member 20 may include a polarization member 23 and/or a color filter 22.

Here, the polarizing member 23 may transmit light parallel to a polarizing axis in one direction among the light emitted from the organic light emitting diode 120. The polarizing member 23 may be a coating type polarizing layer or a polarizing layer formed via deposition. The polarizing member 23 may be formed by coating with a material containing a dichroic dye and a liquid crystal compound. Further, the polarizing member 23 serves to prevent or substantially prevent reflection of external light. In an embodiment, the polarizing member 23 may include a quarter wave plate.

In the embodiment, the color filter 22 may be any one of color filters corresponding to red, green, and blue colors. The red color filter selectively transmits red light. Here, the wavelength of red light may range from 620nm to 750 nm. The green color filter selectively transmits green light. Here, the wavelength of the green light may range from 495nm to 570 nm. The blue color filter selectively transmits blue light. Here, the wavelength of the blue light may range from 450nm to 495 nm.

In an embodiment, a red color filter may be disposed in the red pixel, a green color filter may be disposed in the green pixel, and a blue color filter may be disposed in the blue pixel. Since the color filters of the same color are arranged in the pixels of the same color, color mixing at the respective pixels can be prevented or substantially prevented, and color reproducibility at the respective pixels can be improved. In addition, since the color filter 22 absorbs external light at a relatively high level, reflection of external light can be reduced even without additionally providing the polarizing member 23 and the like.

The window unit 30 may be disposed on the anti-reflection member 20. The window unit 30 serves to protect the display substrate 10 by covering the display substrate 10. The window unit 30 may include a flexible material and a transparent material. For example, the window unit 30 may be made of a material including plastic, and the window unit 30 in this case may have flexible properties.

Examples of suitable plastics for the window unit 30 may include, but are not limited to, polyimide, polyacrylate, Polymethylmethacrylate (PMMA), Polycarbonate (PC), polyethylene naphthalate (PEN), polyvinylidene chloride, polyvinylidene fluoride (PVDF), polystyrene, ethylene vinyl alcohol copolymer, Polyethersulfone (PES), Polyetherimide (PEI), polyphenylene sulfide (PPS), polyallyl ester, triacetyl cellulose (TAC), and Cellulose Acetate Propionate (CAP). The window unit 30 may be formed to include one or more of the listed plastic materials.

The film unit 40 may be disposed under the display substrate 10. In an embodiment, the film unit 40 may be a protective film. In an embodiment, the film unit 40 may be disposed to cover the entire bottom surface of the display substrate 10.

The film unit 40 may be made of, but not limited to, a plastic material such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polyimide (PI), or polyethylene sulfide.

The pad unit 50 may be disposed under the membrane unit 40. The cushion unit 50 may be formed of any of various materials that provide a cushioning function. For example, the cushion unit 50 may be formed of latex, sponge, urethane foam as a foam resin, EVA, or silicone resin. In an embodiment, the cushion unit 50 may be formed in the form of a belt having a cushion.

The sensing film 60 may be disposed under the pad unit 50. In an embodiment, the sensing film 60 may be disposed to overlap the entire bottom surface of the display substrate 10. In this specification, the expression "the first member and the second member overlap each other" may mean that the first member and the second member overlap each other in the thickness direction (i.e., the third direction DR3) in a state where the flexible display device 1 is unfolded. In an embodiment, the sensing film 60 may be disposed to overlap with the bending region BA and all of the plurality of non-bending regions NBA1 and NBA 2.

Further details of the sensing membrane 60 will be provided below with reference to fig. 6.

In an embodiment, the sensing film 60 includes a base film 201 and a digitizer module 200 disposed on the base film 201. The digitizer module 200 may include a first sensing electrode 210, an insulating layer 220, a second sensing electrode 230, and a passivation layer 240 sequentially stacked on the base film 201.

In an embodiment, the first and second sensing electrodes 210 and 230 may function as receiver type electrodes. One of the first and second sensing electrodes 210 and 230 may extend in the first direction DR1, and the other may extend in a direction intersecting the first direction DR 1.

Each of the first and second sensing electrodes 210 and 230 may include a conductive material, and in an embodiment, may include a metal material. For example, gold (Au), silver (Ag), copper (Cu), molybdenum (Mo), nickel (Ni), chromium (Cr), silver-palladium-copper (APC) alloy, or the like may be used as the metal material, but the metal material is not limited to such examples.

In an embodiment, each of the first and second sensing electrodes 210 and 230 may haveTo a thickness of 10 μm. When the thickness of each of the first and second sensing electrodes 210 and 230 is less thanWhen the thickness is more than 10 μm, the surface resistance may increase and then the electrical characteristics of the sensing electrode may deteriorate, and the flexibility resistance of the sensing electrode may deteriorate.

In an embodiment, each of the first and second sensing electrodes 210 and 230 may have aboutToIs measured. When the first and second sensing electrodes 210 and 230 are formedRanges from the thickness of each ofToWhen this occurs, the folding endurance may be ensured so as to be able to be not only bent but also folded, and thus the first and second sensing electrodes 210 and 230 may be more suitable for the flexible display device 1.

The thicknesses of the first and second sensing electrodes 210 and 230 may be the same as or different from each other.

In an embodiment, the first and second sensing electrodes 210 and 230 may be formed by deposition, and in an embodiment, may be formed by sputtering. When sputtering is used, the first and second sensing electrodes 210 and 230 may be formed to have a thickness smaller than that in the case where a metal foil is used to form the sensing electrodes (as in the case of a currently commercialized sensing film).

The insulating layer 220 may be formed of an organic insulating layer or an inorganic insulating layer.

As the material of the passivation layer 240, an insulating material known in the corresponding technical field may be used without limitation. In addition, as a material of the passivation layer 240, a non-metal oxide (such as silicon oxide) or a photosensitive resin composition or a thermoplastic resin composition including an acrylic resin may be used.

In an embodiment, the passivation layer 240 may be formed of, for example, a polycycloolefin-based material, and may have a thickness of about 0.5 μm to 20 μm.

In another embodiment, the passivation layer 240 may be formed of, for example, an acrylic organic insulating layer, and may have a thickness of about 0.5 to 5 μm.

As the base film 201, a flexible film material may be used, and a film having good mechanical strength and thermal stability may be used. Examples of the base film 201 may include a film made of a thermoplastic resin including, for example: polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, or polybutylene terephthalate; cellulose resins such as diacetyl cellulose or triacetyl cellulose; a polycarbonate resin; acrylic resins such as polymethyl (meth) acrylate or polyethyl (meth) acrylate; styrene resins such as polystyrene or acrylonitrile-styrene copolymers; polyolefin resins such as polyethylene, polypropylene, cyclic polyolefin or polyolefin having a norbornene structure or ethylene-propylene copolymer; vinyl chloride resin; amide resins such as nylon or aromatic polyimide; an imide resin; polyether sulfone resin; a sulfone resin; polyether ether ketone resin; polyphenylene sulfide resin; a vinyl alcohol resin; vinylidene chloride resin; a vinyl butyral resin; an allyl ester resin; a polyoxymethylene resin; and an epoxy resin. In addition, films formed from blends of the thermoplastic resins described above may also be used. In addition, a film formed of a thermosetting resin based on (meth) acrylate, urethane, acrylic urethane, epoxy resin, or silicone resin or formed of a UV-curable resin may be used.

In some embodiments, base film 201 may be omitted.

A plurality of metal plates 70 may be disposed under the sensing film 60. The first metal plate 71 may be disposed at a position overlapping the first non-bent region NBA1, and the second metal plate 72 may be disposed at a position overlapping the second non-bent region NBA 2.

In an embodiment, the respective facing ends of the first and second metal plates 71 and 72 may overlap the bending area BA in a state where the flexible display device 1 is unfolded. In the embodiment, the respective facing ends of the first and second metal plates 71 and 72 may contact each other in a state where the flexible display device 1 is unfolded, but the present disclosure is not limited thereto.

In a state where the flexible display device 1 is bent, the first metal plate 71 and the second metal plate 72 may be separated from each other without being bent, respectively. In other words, the respective ends of the first and second metal plates 71 and 72 facing each other in the state where the flexible display device 1 is unfolded may not contact each other in the state where the flexible display device 1 is bent.

The plurality of metal plates 70 will be described below based on the first metal plate 71. Since the first metal plate 71 and the second metal plate 72 can be configured in substantially the same manner, the description of the first metal plate 71 can be applied to the second metal plate 72. Therefore, a repeated description of the second metal plate 72 will be omitted.

The first metal plate 71 may have an electromagnetic shielding function. The first metal plate 71 may minimize or reduce the influence of electric or magnetic noise occurring under the first metal plate 71 on the sensing electrodes disposed on the first metal plate 71 and the display substrate 10.

Further, the first metal plate 71 may also perform at least one of a thermal function, a grounding function, a buffering function, a strength supplementing function, a supporting function, an adhering function, and a pressure sensing function.

In an embodiment, the first metal plate 71 may be formed of a soft magnetic material, and may be a thin metal plate having an amorphous structure or a nanocrystalline structure. Here, the soft magnetic material means a magnetic material which is strongly magnetized and has a low current magnetization even if an external magnetic field is only slightly applied thereto. Soft magnetic materials are different from hard magnetic materials (or ferromagnetic materials) in which the magnetic moments are aligned in one direction in the absence of an external magnetic field.

Soft magnetic materials can be magnetized at low magnetic fields (e.g., below 800A/m). In an embodiment, the soft magnetic material may have a high permeability (e.g., an initial value ranging from 102 μ to 105 μ and a maximum value ranging from 103 μ to 106 μ). In an embodiment, the coercivity of the soft magnetic material may range from 0.8A/m to 8A/m.

In some materials with low strength magnetic anisotropy energy, the ability of soft magnetic materials to be magnetized at low magnetic fields may occur. For example, the soft magnetic material may include invar alloy (such as Fe-Co-Cr alloy, Fe-Ni alloy, or Fe-Ni-Co alloy), ferritic stainless steel (such as SUS430(Fe-Cr alloy), or the like), permalloy (Fe-Ni alloy), permvar, or permalloy.

In an embodiment, the thickness h1 of the first metal plate 71 may range from about 20 μm to 150 μm.

The above-described display substrate 10, anti-reflection member 20, window unit 30, film unit 40, pad unit 50, sensing film 60, and metal plate 70 may be attached to each other with the adhesive member 80 interposed therebetween, respectively.

For example, the display substrate 10 and the anti-reflection member 20 may be attached to each other by a first adhesive member 81, the anti-reflection member 20 and the window unit 30 may be attached to each other by a second adhesive member 82, the display substrate 10 and the film unit 40 may be attached to each other by a third adhesive member 83, the film unit 40 and the pad unit 50 may be attached to each other by a fourth adhesive member 84, and the pad unit 50 and the sensing film 60 may be attached to each other by a fifth adhesive member 85. The sensing film 60 and the first metal plate 71 may be attached to each other by a sixth adhesive member 86, and the sensing film 60 and the second metal plate 72 may be attached to each other by a seventh adhesive member 87.

The plurality of adhesive members 80 may include a film having adhesive properties, such as Optically Clear Adhesive (OCA). In an embodiment, the adhesive member 80 may include an optically transparent resin (OCR).

In some embodiments, one or more of the adhesive members 80 may be omitted.

In an embodiment, the strength of the repulsive force may range from about 14N cm to 20N cm at room temperature when the flexible display device 1 is bent or unfolded. Although the flexible display device 1 according to the present embodiment is provided with the plurality of metal plates 70, an increase in repulsive force may be minimized or reduced as compared to a case where the strength of repulsive force at room temperature of a conventional flexible display device to which the sensing film is not applied is about 14N cm. Since the first metal plate 71 and the second metal plate 72 are disposed in the first non-bending region NBA1 and the second non-bending region NBA2, respectively, the first metal plate 71 and the second metal plate 72 may not be bent even if the flexible display device 1 is bent or folded.

In this manner, since the flexible display device 1 is provided with the sensing film 60 including the digitizer module 200, the repulsive force when the flexible display device 1 is bent or folded or unfolded may be minimized or reduced while recognizing the input of the electronic pen 2.

A flexible display device according to some other embodiments will be described below. Herein, a repeated description of the same components as those in fig. 1 to 6 is omitted, and the same or similar reference numerals are used to designate the same or similar components.

Fig. 7 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure; and fig. 8 is a cross-sectional view illustrating the display substrate and the touch sensing layer of fig. 7.

Referring to fig. 7 and 8, a flexible display device 1_1 according to an embodiment is different from the flexible display device 1 according to the embodiment shown in fig. 4A and 5 in that: a touch sensing layer 90 is also disposed on the display substrate 10.

The touch sensing layer 90 may be disposed on the display substrate 10. In an embodiment, the touch sensing layer 90 may be formed using an on-cell touch (amoled) (octa) scheme in which a touch panel is embedded in a display panel.

The touch sensing layer 90 may be disposed on the encapsulation layer 116 of the display substrate 10. According to an embodiment, the encapsulation layer 116 and the touch sensing layer 90 may be in direct contact with each other.

The touch sensing layer 90 may include a plurality of first sensing electrodes (not shown) and a plurality of second sensing electrodes (not shown). Although not shown in the drawings, the plurality of first sensing electrodes and the plurality of second sensing electrodes may intersect each other in a plane. In an embodiment, the plurality of first and second sensing electrodes may include first and second sensing lines SPL1 and SPL2 each having a planar mesh shape, respectively.

The plurality of first sensing lines SPL1 may be electrically isolated from the plurality of second sensing lines SPL 2. The plurality of first sensing lines SPL1 and the plurality of second sensing lines SPL2 may be disposed on the same layer or on different layers. Fig. 8 illustrates an example in which the first sensing line SPL1 and the second sensing line SPL2 are disposed on different layers.

The plurality of first sensing lines SPL1 and the plurality of second sensing lines SPL2 may include a conductive material. Here, the conductive material may include, for example, a low-resistance material such as silver (Ag), aluminum (Al), chromium (Cr), or nickel (Ni) and a conductive nanomaterial such as a silver nanowire or a carbon nanotube.

In an embodiment, the first sensing line SPL1 may be disposed directly on the encapsulation layer 116. However, the embodiment is not limited thereto, and an insulating layer having a single-layer structure or a multi-layer structure may be interposed between the encapsulation layer 116 and the first sensing line SPL 1.

The first sensing line SPL1 and the encapsulation layer 116 may be provided thereon with a first touch insulating layer 131.

The first touch insulating layer 131 may include, for example, an inorganic material. Here, the inorganic material may include a material selected from the group consisting of silicon oxide (SiO)_x) Silicon nitride (SiN)_x) And silicon oxynitride (SiON)_x) One or more of the group consisting of. In an embodiment, the first touch insulating layer 131 may include an organic material. Here, the organic material may include at least one of acrylic resin, methacrylic resin, polyisoprene, polyethylene resin, epoxy resin, polyurethane resin, cellulose resin, silicone resin, polyimide resin, polyamide resin, and perylene resin.

The second sensing line SPL2 may be disposed on the first touch insulating layer 131. The first and second sensing lines SPL1 and SPL2 may overlap the pixel defining layer 115. In other words, since the first and second sensing lines SPL1 and SPL2 completely overlap the pixel defining layer 115, the first and second sensing lines SPL1 and SPL2 can be prevented or substantially prevented from being perceived by a user.

The second touch insulating layer 132 may be disposed on the first touch insulating layer 131 and the second sensing line SPL 2. The second touch insulating layer 132 may include, for example, an inorganic material or an organic material. Since the types of the inorganic material and the organic material may be the same as those of the first touch insulating layer 131, further detailed description thereof will be omitted. Although the first touch insulating layer 131 and the second touch insulating layer 132 are illustrated as having a single-layer structure in fig. 8, they may have a multi-layer structure.

Here, the second touch insulating layer 132 may be a passivation layer or a planarization layer.

Fig. 9 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Referring to fig. 9, a flexible display device 1_2 according to an embodiment is different from the flexible display device 1 according to the embodiment shown in fig. 4A in that: and a fourth metal plate 74 disposed below the second metal plate 72.

The fourth metal plate 74 may be attached to the bottom of the second metal plate 72 by an eighth adhesive member 88.

In an embodiment, the respective facing ends of the first and second metal plates 71 and 72 may be spaced apart from each other at an interval (e.g., a predetermined interval). Here, in order to reduce the influence of noise occurring under the first and second metal plates 71 and 72 on the sensing electrode and the display substrate 10 through the separation space between the first and second metal plates 71 and 72, a fourth metal plate 74 may be disposed under the second metal plate 72.

The fourth metal plate 74 may be provided to cover the partitioned space. In an embodiment, one end of the fourth metal plate 74 attached to the bottom of the second metal plate 72 may extend to overlap at least a portion of the first metal plate 71. In other words, the fourth metal plate 74 may overlap the first metal plate 71 by a width (e.g., a predetermined width) W1.

Similar to the first metal plate 71, the fourth metal plate 74 may be formed of a soft magnetic material and may include the materials described above with respect to the first metal plate 71.

Fig. 10 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Referring to fig. 10, a flexible display device 1_3 according to an embodiment is different from the flexible display device 1 according to the embodiment shown in fig. 4A in that: and a third metal plate 73 disposed below the first metal plate 71.

The third metal plate 73 may be attached to the bottom of the first metal plate 71 by a ninth adhesive member 89.

Since the description of the present embodiment can be applied in substantially the same manner as the configuration in which the fourth metal plate 74 is disposed below the second metal plate 72 according to the embodiment shown in fig. 9, a repetitive description thereof will be omitted.

Fig. 11 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure; and fig. 12 is a schematic perspective view of the sensing film of fig. 11 for explaining a plane of the sensing film.

Referring to fig. 11 and 12, the flexible display device 1_4 according to the embodiment is different from the flexible display device 1 according to the embodiment shown in fig. 4A and 5 in that: the first metal plate 71_1 is disposed to overlap all of the first non-bent region NBA1, the second non-bent region NBA2, and the bent region BA below the display substrate 10, and the second metal plate 72 is omitted. The sensing film 60 and the first metal plate 71_1 may be attached to each other by a sixth adhesive member 86_ 1.

The first metal plate 71_1 may include a mesh pattern LT on a surface thereof. In the embodiment, the mesh pattern LT may be formed on the surface of the first metal plate 71_1 in the form of grooves, or formed to penetrate the first metal plate 71_1 in the form of holes.

The first metal plate 71_1 may include a mesh region 71_1c and flat regions 71_1a and 71_1b, the mesh region 71_1c being defined as a region in which the mesh pattern LT is formed, and the flat regions 71_1a and 71_1b being defined as a region in which the mesh pattern LT is not formed. The flat areas 71_1a and 71_1b may be positioned with the mesh area 71_1c interposed therebetween.

In an embodiment, the mesh region 71_1c may overlap with the bending region BA. In other words, the mesh pattern LT may be formed to overlap the bending area BA. The width W2 of the mesh region 71_1c may vary with the radius of curvature obtained when the flexible display device 1_4 is bent. In an embodiment, the width W2 of the mesh region 71_1c may range from 2mm to 20 mm.

Since the first metal plate 71_1 may include the mesh pattern LT on the surface thereof, it may be easily bent.

Fig. 13 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Referring to fig. 13, a flexible display device 1_5 according to an embodiment is different from the flexible display device 1_4 according to the embodiment shown in fig. 11 in that: and a third metal plate 73_1 and a fourth metal plate 74_1 disposed below the first metal plate 71_ 1.

The fourth metal plate 74_1 may be attached to the bottom of the first metal plate 71_1 by an eighth adhesive member 88_1 to overlap the second non-bending region NBA2, and the third metal plate 73_1 may be attached to the bottom of the first metal plate 71_1 by a ninth adhesive member 89_1 to overlap the first non-bending region NBA 1.

The third and fourth metal plates 73_1 and 74_1 may extend such that their respective facing ends overlap the bending area BA. The respective facing ends of the fourth and third metal plates 74_1 and 73_1 may overlap the mesh area 71_1c of the first metal plate 71_ 1.

In an embodiment, in a state where the flexible display device 1_5 is unfolded, the respective facing ends of the third and fourth metal plates 73_1 and 74_1 may overlap the bending area BA. In the embodiment, the respective facing ends of the third and fourth metal plates 73_1 and 74_1 may contact each other in a state where the flexible display device 1_5 is unfolded, but the present disclosure is not limited thereto.

Fig. 14 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Referring to fig. 14, a flexible display device 1_6 according to an embodiment is different from the flexible display device 1_4 according to the embodiment shown in fig. 11 in that: and a fourth metal plate 74_2 disposed below the first metal plate 71_ 1.

The fourth metal plate 74_2 may be attached to the bottom of the first metal plate 71_1 by an eighth adhesive member 88_1 to overlap the second non-bent region NBA 2. The eighth adhesive member 88_1 may overlap the second non-bending region NBA 2. The fourth metal plate 74_2 may be disposed to cover the mesh area 71_1c of the first metal plate 71_ 1. In other words, the fourth metal plate 74_2 may extend such that one end thereof overlaps the bent region BA, and may further extend such that one end thereof overlaps at least a portion of the first non-bent region NBA 1.

Fig. 15 is a schematic cross-sectional view of a flexible display device according to an embodiment of the present disclosure.

Referring to fig. 15, a flexible display device 1_7 according to an embodiment is different from the flexible display device 1_1 according to the embodiment shown in fig. 7 in that: the anti-reflection member 20 and the first adhesive member 81 are omitted, and the wavelength conversion pattern 21 and the color filter 22 are also directly disposed on the touch sensing layer 90.

The wavelength conversion pattern 21 may convert a peak wavelength of incident light into another specific peak wavelength and emit wavelength-converted light. The light passing through the wavelength conversion pattern 21 may indicate any one of three primary colors such as red, green, and blue. However, the colors indicated by the light passing through the wavelength conversion patterns 21 are not limited to the three primary colors, and the light passing through the wavelength conversion patterns 21 may indicate any one of cyan, magenta, yellow, and white.

The wavelength conversion pattern 21 may include a wavelength conversion material. The wavelength converting material may convert a peak wavelength of incident light to another specific peak wavelength. Examples of the wavelength conversion material may include Quantum Dots (QDs), quantum rods, or fluorescent substances. Quantum dots may be particulate materials that emit light of a particular wavelength when an electron is transferred from the conduction band to the valence band.

In an embodiment, the quantum dots may be semiconductor nanocrystalline materials. Since the quantum dots have a specific band gap according to their formation and size, the quantum dots can absorb light and then emit light having an inherent wavelength. Examples of semiconductor nanocrystal materials for quantum dots can include group IV nanocrystals, group II-VI compound nanocrystals, group III-V compound nanocrystals, group IV-VI nanocrystals, or combinations thereof.

The color filter 22 may selectively transmit a specific color of light and absorb another color of light, thereby blocking the travel of light. The light having passed through the color filter 22 may indicate any one of three primary colors such as red, green, and blue. However, the color of the light that has passed through the color filter 22 is not limited to the three primary colors, and the light that has passed through the color filter 22 may indicate any one of cyan, magenta, yellow, and white.

Since the color filter 22 absorbs external light at a relatively high level, reflection of external light can be reduced even without additionally providing a polarizing unit or the like.

The window unit 30 may be disposed on the color filter 22, and the color filter 22 and the window unit 30 may be attached to each other with the second adhesive member 82 interposed between the color filter 22 and the window unit 30.

In some other embodiments, the order of disposing the wavelength conversion pattern 21 and the color filter 22 may be reversed.

Although some embodiments of the present disclosure have been disclosed, those skilled in the art will appreciate that the present disclosure may be implemented in other forms without departing from the technical spirit or characteristics of the present disclosure as set forth in the appended claims. Accordingly, it is to be understood that the above described embodiments are provided by way of example and not limitation.