KR101871652B1 - Flexible display device - Google Patents

Abstract

The present invention discloses a flexible display device capable of accurately detecting bending information in the case of bending, bending, and folding, as well as variously controlling images displayed on the screen. To this end, the flexible display device according to the present invention includes a flexible touch screen unit and a bending detection unit which is provided in the touch screen unit and detects bending information by varying capacitance or resistance value according to bending of the touch screen unit.

Description

[0001] FLEXIBLE DISPLAY DEVICE [0002]

The present invention relates to a flexible display device, and more particularly, to a flexible display device capable of detecting bending information such as folding or bending of a flexible display device and outputting an image to be corrected.

2. Description of the Related Art [0002] A display device is a device provided in an electronic device to reproduce a screen. In general, a flat panel display is mainly used for a display device.

In recent years, flexible flexible display devices capable of flexing, bending, and flexing have attracted attention. In general, flexible display devices are generally not defined, but are generally referred to as flexible display devices formed on a flexible substrate. Such a flexible display device is a display made of a flexible substrate such as a plastic, and it is a display which is resistant to impact while maintaining the conventional screen characteristics, has excellent flexibility and is tough, It is a big feature that it can bend, bend, and speak.

In order to realize such a flexible display device, a thin film transistor liquid crystal display (OLED) or electrophoretic technology is mainly used.

The prior art related to the flexible display device is disclosed in Korean Registered Patent No. 10-0933710 (registered on Dec. 16, 2009, entitled " Display-Integrated Flexible Touch Screen with Tactile Sensor and Its Implementation Algorithm for Recognition Algorithm " , Korean Registered Patent No. 10-0667569 (filed on May 1, 2007, entitled: Flexible Display Device).

However, in the conventional flexible display device, when the display device is bent or bent, there is a problem that warpage or bending of the display device can not be detected.

Further, when the flexible display device is bent or warped, the image displayed on the screen is displayed without correction due to bending or warping, thereby causing a problem that the feeling of use of the user is lowered.

Further, when the flexible display element is bent or folded, when the flexible display element is bent or folded, an image is displayed up to a portion not visible to the user, thereby consuming power.

Therefore, the present invention can provide a flexible display device capable of detecting information on bending, such as bending, bending, folding, etc., such as a position or an angle of a bending, bending or folding point And a flexible display device.

In addition, the present invention can be applied to a flexible display device in which a position or an angle generated on a curved surface is detected to correct an image displayed on a screen in accordance with an environment in which a user uses the display device, or when a flexible display device is folded, And a power consumption can be reduced by displaying a screen of a portion which is not required to be displayed in black.

According to an aspect of the present invention, there is provided a flexible display device including: a flexible touch screen unit; And a bending detector provided in the touch screen unit and detecting bending information by varying a capacitance or a resistance value according to the bending of the touch screen unit.

To this end, the bending detection unit may include: a seat portion flexibly coupled to a lower portion of the touch screen portion and having a wave-shaped bent portion on one side; And a sensor portion disposed along the bent portion, the sensor portion including a plurality of sensors whose capacitance or resistance value varies according to deformation of the bent portion.

As described above, the flexible display device according to the present invention has a bending detection part at the lower part of the touch screen part, so that it is possible to detect the bending, bending or folding position and angle of the touch screen part.

Also, there is an effect of compensating the image displayed on the screen according to the bending information, or improving the user's feeling through the UI or UX correction.

Further, by detecting the position of the bent portion of the touch screen, the position of the bent portion, the degree of bending, the degree of bending, and the like, the screen which does not need to display an image is displayed in black, thereby reducing power consumption.

1 is a perspective view schematically showing a flexible display device according to a first embodiment of the present invention.
2 is a cross-sectional view schematically showing a flexible display device according to a first embodiment of the present invention;
3 is an enlarged view of a portion A in Fig.
4 is a view showing an operation state of a bending detection unit when a screen is bent or collapsed in the flexible display device according to the first embodiment of the present invention.
5 and 6 are views showing other shapes of the first and second metal plates in the flexible display device according to the first embodiment of the present invention.
7 is a view showing a bending state of the first and second metal plates having the shape of Fig. 5 in the flexible display device according to the first embodiment of the present invention. Fig.
8 is a block diagram of a flexible display device according to the first embodiment of the present invention.
9 is a view showing a state in which the flexible display device according to the first embodiment of the present invention is bended concavely and convexly.
FIG. 10 is a view showing an image of a screen in a state in which the flexible display device according to the first embodiment of the present invention is concaved and convexly bent; FIG.
11 is a view showing a folded state of the flexible display device according to the first embodiment of the present invention.
12 is a view schematically showing a flexible display device according to a second embodiment of the present invention.
13 is an enlarged view of a bending detection portion in a flexible display device according to a second embodiment of the present invention.

Hereinafter, an embodiment of a flexible display device according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

Hereinafter, in the embodiments of the present invention, ordinal numbers such as first, second, and so on are used, but they are for distinguishing objects of the same name from each other, and the order thereof may be arbitrarily determined. Of the present invention may be applied mutatis mutandis.

A configuration of a flexible display device according to a first embodiment of the present invention will be described with reference to Figs. 1 to 11. Fig.

FIG. 1 is a perspective view schematically showing a flexible display device according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically showing a flexible display device according to a first embodiment of the present invention.

Referring to FIGS. 1 and 2, a flexible display device 1 according to a first embodiment of the present invention includes a touch screen unit 10 and a bending detection unit 100.

The touch screen unit 10 is flexible so that it can be bent, bent, or bent. The touch screen unit 10 may function as a user interface (UI) for outputting a desired screen to a user or receiving a command from the user. In this embodiment, the touch screen unit 10 uses a dual layer capacitance type including two ITO panels. However, this is only one example. The touch screen unit 10 has flexibility, , But it can be replaced with another configuration as long as the configuration can recognize this.

A dual layer capacitive type touch screen unit 10 including two ITO panels includes an upper film 11 and a first layer 12 and a second layer 13.

The upper film 11 is flexible and an image is output through the upper film 11. [ The upper film 11 is installed at the outermost side of the touch screen unit 10 and preferably has a predetermined durability so as to protect the flexible display device 1 from external mechanical impact. In the present embodiment, the upper film 11 is made of polyethylene terephthalate (PET), polycarbonate (PC), polymethylmethacrylate (PMMA), polyethylene naphthalate (PEN), polyethersulfone (PES) (COC), glass or tempered glass. However, it may be replaced with another structure provided that it is provided at the outermost part of the touch screen unit 10 and has durability and flexibility.

The first layer 12 is provided under the upper film 11 and the ITO layers are deposited in parallel with each other in the first direction. The second layer 13 includes a second layer 12, The ITO layers are deposited parallel to each other. The first and second layer units 12 and 13 are formed in accordance with the size of the screen. When the first layer unit 12 and the second layer unit 13 are stacked, the first and second layer units 12 and 13, 13 are arranged in a lattice manner with respect to each other. That is, when the ITO layers of the first layer section 12 are arranged in parallel in the X-axis direction, the ITO layers of the second layer section 13 are arranged in parallel in the Y-axis direction. Conversely, when the ITO layers of the first layer section 12 are arranged in the Y-axis direction, the ITO layers of the second layer section 13 are arranged in the X-axis direction. When a finger or the like is brought into contact with at least one point on the touch screen unit 10 in a state where a voltage is applied to generate an electric field in the ITO layer of the first and second layer units 12 and 13, The capacitance is varied or the resistance value is varied to cause a drop phenomenon, whereby the position value of the touched point is recognized.

The bending detection unit 100 is provided on the touch screen unit 10 and is flexible enough to bend along with the bending of the flexible touch screen unit 10. When the bending detection unit 100 is bent, the capacitance or the resistance value is varied to detect the bending information at the point B where the touch screen unit 10 is bent. In the first embodiment, the bending information may refer to various results. For example, the position of the bending point B, the angle of the bending point B, and the like are detected in accordance with the difference in capacitance or the resistance value to be measured.

FIG. 3 is an enlarged view of a portion A in FIG. 2, which is an enlarged view of a bending detecting portion provided on the lower side of the touch screen portion, FIG. 4 is a cross-sectional view of the flexible display device according to the first embodiment of the present invention, Fig. 7 is a view showing the operating state of the bending detecting section when folded.

3 and 4, the bending detection unit 100 includes a sheet unit 110, a sensor unit 120, an insulating film 130, and a control unit 140 (shown in FIG. 8).

The seat portion 110 is flexibly coupled to a lower portion of the touch screen unit 10. [ One surface of the seat portion 110 is formed of a bent portion 111 having a wave shape so as to increase a variation of a variable value of a capacitance or a resistance value of the sensors 121 and 122 to be described later. The bent portion 111 is provided with a crest portion 111a and a valley portion 111b having a constant height and width (see FIG. 1). When the point B of the touch screen unit 10 is bent concavely or convexly or when it is folded in one direction the crest 111a and the crest 111b of the bend point B or the bend point B, And the capacitance and the resistance value between the sensors 120 and 130 provided at the point B are changed.

The sensor unit 120 includes a plurality of sensors 121 and 122 which are disposed adjacent to each other along the bend 111 and whose capacitance and resistance vary according to the bending of the bend 111. [ The sensors 121 and 122 are provided in pairs adjacent to each other along the bend 111. [ A plurality of sensors 121 and 122 are arranged along the other direction from one side of the seat portion 110.

The sensors 121 and 122 are formed of a pair of a first metal plate 121 and a second metal plate 122.

The first metal plate 121 is provided along the curved surface of the bent portion 111. The second metal plate 122 is adjacent to the first metal plate 121 and is provided along the curved surface of the bent portion 111. When the seat portion 110 is bent, the distance between the crest 111a of the bend 111 and the crest 111a adjacent to the crest 111 and the height between the crest 111b and the crest 111b are changed, The capacitance between the first metal plate 121 and the second metal plate 122 disposed on the first metal plate 121 is variable or the resistance value is varied. The first metal plate 121 and the second metal plate 121 are disposed on the bend point B so that the shape of the bend section 111 changes according to the degree of bending of the touch screen unit 10, The capacitance between the electrodes 122 and 122 and the resistance value thereof are different from each other. Whereby the position of the bending point B as well as the angle of the bending point B can be accurately detected.

Therefore, when a predetermined position on the touch screen unit 10 is bent, the capacitance between the at least one pair of the first metal plate 121 and the second metal plate 122 provided on the bending point B The resistance value is changed, and the bending position and the bending angle of the touch screen unit 10 are determined according to the change of the capacitance and the change of the resistance value. Accordingly, the control unit 140 (see FIG. 8), which will be described later, receives the bending information, corrects and displays the image displayed on the screen, or displays an image corrected according to the UI (user interface) or UX (150).

In the first embodiment, the first and second metal plates 121 and 122 are preferably made of carbon nanotube (CNT) or silver nanowire (AgNW), but the first and second metal plates 121 and 122 are made of But may be replaced with a material having a different constitution or material provided that it is made of a material which can be provided in the bending portion 111 and has a change in capacitance or resistance value according to a change in the shape of the bending portion 111 Of course it is.

The insulating layer 130 is provided on the upper surface of the bent portion 111 for bonding the sensor portion 120. In the first embodiment, the insulating layer 130 is made of SiO2, but the present invention is not limited thereto. It is needless to say that the present invention can be replaced with another structure as long as it can insulate and adhere between the touch screen unit 10 and the sensor unit 120.

The first and second metal plates 121.122 are adjacent to each other and are formed to bend on the upper surface of the bend 111 up to a peak 111a spaced apart from the peak 111a. However, this is merely an example, and the first and second metal plates 121a and 122a having different shapes from the first and second metal plates 121 and 122 of the first embodiment described later with reference to FIGS. 5 and 7 ) 121b, 122b, it is possible for various variants to exist.

5 and 6 are views showing other shapes of the first and second metal plates in the flexible display device according to the first embodiment of the present invention. Fig. 7 is a cross- sectional view of the flexible display device according to the first embodiment of the present invention. 5 is a view showing the bending state of the first and second metal plates having the shape shown in Fig.

5, the first metal plate 121a is formed at the bent portion 111 at a pitch interval from the peak 111a adjacent to the peak 111a, and the second metal plate 122a is formed at the first And is formed in the bent portion 111 with a pitch interval from the peak 111a to the adjacent peak 111a. 6, the first metal plate 121b is formed at the bent portion 111 at a pitch of one pitch to the valley portion 111b adjacent to the valley portion 111b, and the second metal plate 122b is formed 1 metal plate 121b and is formed along the curved portion 111 with a pitch of one pitch from the valley 111b to the neighboring valley 111b. As described above, the first metal plate 121 and the second metal plate 122 are provided on the bending portion 111 in a pair, and the shape, size, and the like of the first metal plate 121 and the second metal plate 122 can be modified.

When the flexible display device 1 formed as described above is bent, the shape of the bending portion 111 varies depending on the degree of bending of the touch screen portion 10. The capacitance or resistance value between the first metal plate 121 and the second metal plate 122 provided along the bend section 111 varies depending on the degree of bending. The bending position of the touch screen unit 10 due to the difference in capacitance or resistance value between the first metal plate 121 and the second metal plate 122 disposed on the bending point B It is possible to accurately detect the bend angle and the like. Since the bending position and the bending angle of the touch screen unit 10 are determined according to the change of the capacitance or the resistance value, the control unit 140 (see FIG. 8) described later receives the bending information and corrects the image displayed on the screen , UI, or UX matching image on the screen (150).

Fig. 8 is a block diagram of a flexible display device according to the first embodiment of the present invention, Fig. 9 is a view showing a state in which the flexible display device according to the first embodiment of the present invention is bended concavely and convexly, Fig. 10 FIG. 11 is a view showing an image of a screen in a state where the flexible display device according to the first embodiment of the present invention is bent concavely and convexly, FIG. 11 is a view showing a folded state of the flexible display device according to the first embodiment of the present invention FIG.

Referring to FIG. 8, the controller 130 controls an image 160 of the screen according to a detection value detected by the sensor unit 120. That is, the control unit 140 receives the bending information detected by the sensor unit 120, and corrects the image displayed on the screen according to the position of the bending point B or the bending angle, (150) on the screen.

9, when one point B of the upper surface portion of the touch screen unit 10 is bended convexly or concavely, the control unit 140 may zoom in or out the image displayed on the touch screen unit 10, Zoom out is controlled.

Referring to FIG. 10, the image displayed on the screen can be modified according to the bending information transmitted to the controller 140. That is, the flexible display device 1 can be modified into a 3D image in accordance with a bending state, and the image can be displayed in a vertical direction.

11, when one point B of the touch screen unit 10, such as the case where the flexible display device 1 is bent and fixed, is bent at a predetermined angle or more, So that the screen of the portion where the control unit 140 bends is displayed in black. As a result, the power consumption of the flexible display device 1 can be reduced.

Accordingly, it is possible to output an image, which is corrected through information on a bending point B in the flexible display device 1, that is, a bending position, a bending direction, a bending angle, (160).

Hereinafter, a second embodiment of the flexible display device will be described with reference to Figs. 12 and 13. Fig.

FIG. 12 is a view schematically showing a flexible display device according to a second embodiment of the present invention, and FIG. 13 is an enlarged view of a bending detection part in a flexible display device according to another embodiment of the present invention.

12 and 13, the flexible display device 1 according to the second embodiment includes a touch screen unit 10 and a bending detection unit 100. The second embodiment differs from the bending detecting section 100 of the first embodiment in the structure thereof.

That is, the bending detecting unit 200 according to the second embodiment includes the first sheet portion 210, the second sheet portion 220, the sensor portion 230, the insulating film 240, and the control portion 140 ).

The first seat portion 210 is flexibly coupled to the lower portion of the touch screen portion 10 and has a first bend portion 211 having a wavy shape on one side thereof and a second bend portion 211, And a second bent part 221 which is flexibly coupled to the lower part of the first part 210 and has one side in the shape of a wave and is opposite to the first bent part 211 is formed.

The first and second bent portions 211 and 221 formed on one surface of the first and second sheet portions 210 and 220 are formed in wave form so as to increase the variation of the capacitance and the resistance value of the sensors 231 and 232, . In the second embodiment, the first and second bending portions 211 and 221 have a predetermined height and width, and the respective hill portions 211a and 221a and the valleys 211b and 221b are disposed to face each other. However, The peak 211a and the valley 211b of the first bend 211 may be provided so as to face the valley 221b and the peak 221a of the second bend 221 respectively, And the sensors 231 and 232 provided in the second bending portion 221 can be varied in various ways.

The shapes of the crests 211a and 221a and the crest portions 211b and 221b of the bent or folded points are changed when the touch screen unit 10 is bent concavely or convexly or folded in one direction, The capacitance and the resistance value of the sensors 231 and 232 vary between the first bend section 211 and the second bend section 221.

The sensor unit 230 is provided on the first and second bend units 211 and 222 and the pair of sensors 231 and 232 are provided on the first bend unit 211 and the second bend unit 221 so as to face each other. When a plurality of sensors 231 and 232 are disposed adjacent to each other along the first bend section 211 and the second bend section 221 so that the touch screen section 10 is bent, The capacitance and the variable value between the sensors 231 and 232 are variable.

The sensors 231 and 232 include a first metal plate 231 and a second metal plate 232. The first metal plates 231 are disposed adjacent to each other along the first curved surface of the first bent portion 211. The second metal plates 232 are disposed adjacent to each other along the second curved surface 221 of the second bent portion 221 and opposed to the first metal plate 231.

In the second embodiment, the first metal plate 231 is formed along the upper surface of the first bent portion 211 from the peak 211a of the first bent portion 211 to the peak 211a spaced apart from the peak 211a. 2 metal plate 232 is formed along the upper surface of the second bending portion 221 from the hill 221a of the second bend 221 to the hill 221a spaced apart by a certain distance. However, the shapes of the first metal plate 231 and the second metal plate 232 are not limited thereto, and various modifications are possible. For example, the first metal plate 231 is formed at the first bend 211 at a pitch interval, and the second metal plate 232 is formed on the second bend 221 in opposition to the first metal plate 231 And the capacitance and the resistance value according to the gap between the first and second metal plates 231 and 232 can be varied according to the bending.

The first and second seat portions 210 and 220 are bent and the touch screen portion 10 is bent so that the length between the adjacent hill portions 211a of the first bend portion 211 or between the adjacent hill portions 211b The height between the peak 211a and the valley 211b and the length between adjacent peaks 221a of the second bend 221 or between the valleys 221b adjacent to each other The height between the hill 221a and the valley 221b is changed.

The distance between the first metal plate 231 and the second metal plate 232 may be varied so that the capacitance may be varied or the resistance value may be varied do. 9 to 10) because the distance between the first bend section 211 and the second bend section 221 varies depending on the degree of bending of the touch screen section 10 The distance between the first metal plate 231 and the second metal plate 232 is different from each other and the capacitance and resistance value between the respective sensors 231 and 232 are different. Accordingly, the sensor unit 230 can accurately detect the bent position as well as the bent position. The bending information is transmitted to the control unit 140 (see FIG. 8), and the control unit 140 receives the bending information, corrects and displays the image 160 displayed on the screen, It is possible to output an image to the screen.

In the second embodiment, the first and second metal plates 232 and 232 are preferably made of carbon nanotube (CNT) or silver nanowire (AgNW) as in the first embodiment, It goes without saying that they may be replaced with materials having different constructions and materials provided that they are made of materials which are provided opposite to each other and have a change in capacitance or resistance value in accordance with a change in distance between them.

The insulating layer 240 is provided between the first bend section 211 and the second bend section 221 so that the sensors 231 and 232 can be bonded to each other while facing each other. The insulating film 240 is formed of a first insulating film 241 and a second insulating film 242. The first insulating film 242 is formed on the upper surface of the first bending portion 211 to bond the first metal plate 231 And the second insulating layer 241 is provided on the upper surface of the second bent portion 221 for bonding the second metal plate 232. Although the first and second insulating films 241 and 242 are made of SiO 2 or the like in the second embodiment, the present invention is not limited thereto. If the first and second metal plates 231 and 232 are configured to be insulated and bonded It is to be understood that other configurations may be substituted.

8) controls the image of the screen according to the detection value detected by the sensor unit 230. The control unit 140 (see FIG. That is, the control unit 140 determines bending information (bending position, bending angle, and the like) detected by the difference between the capacitance of the first metal plate 231 and the second metal plate 232, And corrects the image 160 displayed on the screen or displays the image on the screen according to the UI 160 or the UX 160.

For example, when one point B on the touch screen unit 10 is bended convexly or concavely, the control unit 140 controls the image 160 of the screen to zoom in or zoom out (see FIG. 9) , The image 160 displayed on the screen can be transformed into a 3D image according to a state in which the flexible display device 1a is bent, and the image 160 can be controlled to be transformed in a vertical direction ). The flexible display device 1a can be controlled to be displayed in black by bending the flexible display device 1a at a predetermined angle or more and deviating from the user's gaze (see FIG. 11).

Therefore, the bending detection unit 100 according to the first embodiment and the bending detection unit 200 according to the second embodiment are flexibly provided under the touch screen unit 10, It is possible to detect the bending information of the bend point B by varying the capacitance or the resistance value and to correct the image of the screen according to the bending information or output it to the screen or realize various UI or UX.

1: Flexible display device 10: Touch screen part
100, 200: bending detection unit 110:
120, 230: sensor unit 121, 231: first metal plate
122, 232: second metal plate 130, 240: insulating film
140: control part 210: first seat part
220: second sheet portion

Claims (14)

A flexible touch screen section; And
And a bending detection unit which is provided in the touch screen unit and detects bending information using a sensor unit whose capacitance or resistance value varies according to bending of the touch screen unit,
The bending detection unit may include:
A seat portion flexibly coupled to a lower portion of the touch screen portion and having a wave-shaped bent portion on one side;
The sensor unit comprising a plurality of sensors provided along the bend and varying in capacitance or resistance according to the deformation of the bend; And
And a control unit for controlling the image of the screen according to the detection value of the sensor unit,
Wherein when the one surface of the touch screen unit is bent at a predetermined angle or more, the control unit controls the screen of the bent portion to be displayed in black. The touch screen device according to claim 1,
An upper film;
A first layer disposed under the upper film and having an ITO layer deposited in a first direction; And
And an ITO layer is deposited along a second direction perpendicular to the first direction. [3] The method of claim 2, wherein the upper film comprises at least one of polyethylene terephthalate (PET), polycarbonate (PC), polymethylmethacrylate (PMMA), polyethylene naphthalate (PEN), polyether sulfone (PES) (COC), glass or tempered glass. The flexible display device according to claim 1, wherein an insulating film for bonding the sensor unit is provided on an upper surface of the bent portion. 2. The apparatus of claim 1,
A first metal plate provided along the curved surface of the bent portion; And
And a second metal plate adjacent to the first metal plate and along the curved surface,
Wherein when the seat portion is bent, a capacitance or a resistance value between the first metal plate and the second metal plate provided on the bent position is variable. The flexible display device according to claim 5, wherein the first and second metal plates include carbon nanotubes (CNT) or silver nanowires (AgNW). [7] The method of claim 6, wherein, when the predetermined position on the touch screen unit is bent, the first metal plate and the second metal plate, which are provided on the bent position, Wherein the bending position and the bending angle of the touch screen unit are determined. The flexible display device according to claim 7, wherein when the upper surface of the touch screen unit is bended convexly or concavely, the control unit controls the image displayed on the touch screen unit to zoom in or zoom out. The method according to claim 1,
Wherein the seat portion of the bending detection portion includes: a first seat portion flexibly coupled to a lower portion of the touch screen portion, the first seat portion having a first surface forming a first bent portion in a wave shape; And
And a second seat portion flexibly coupled to a lower portion of the first seat portion, the second seat portion having a first surface formed in a wave shape and forming a second bend portion opposed to the first bend portion,
Wherein the sensor unit is provided at the first and second bends and is opposed to each other and the capacitance and the resistance value are variable when the touch screen unit is bent. Device. 10. The apparatus of claim 9,
A first metal plate provided on a first curved surface of the first bent portion; And
And a second metal plate provided on a second curved surface of the second curved portion and facing the first metal plate,
Wherein when the touch screen unit is bent, a capacitance or a resistance value between the first metal plate and the second metal plate is varied. The method of claim 10, wherein a first insulating layer for bonding the first metal plate is provided on an upper surface of the first bent portion, and a second insulating layer is provided on an upper surface of the second bent portion for bonding the second metal plate And the flexible display device. The flexible display device according to claim 10, wherein the first and second metal plates include carbon nanotubes (CNT) or silver nanowires (AgNW). 11. The method of claim 10,
Wherein when a predetermined position on the touch screen unit is bent, a bending position or a bending angle of the touch screen unit is changed according to a change in capacitance or resistance value between the first metal plate and the second metal plate, Is determined. The flexible display device according to claim 13, wherein when the upper surface of the touch screen unit is bended convexly or concavely, the control unit controls the image displayed on the touch screen unit to zoom in or zoom out.

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