KR102430054B1 - Stretchable touch display device - Google Patents

Abstract

The present invention relates to a stretchable touch display device having a touch sensor configured with a closed loop wiring.
The stretchable touch display device of the present invention is an organic light emitting display panel including a plurality of touch electrodes disposed on an encapsulation layer, wherein each touch electrode is formed of a closed loop wiring connecting vertices, and It is characterized in that 2n (n≥3) vertices face the center of the touch electrode and are symmetrically configured.

Description

Stretchable touch display device {STRETCHABLE TOUCH DISPLAY DEVICE}

The present invention relates to a stretchable touch display device having a touch sensor configured with a closed loop wiring.

A video display device that implements various information on a screen is a key technology in the information and communication era, and is developing in the direction of thinner, lighter, more portable and high-performance. Accordingly, an organic light emitting display panel that displays an image by controlling the amount of light emitted from the organic light emitting diode is in the spotlight.

Since the organic light emitting display panel is implemented without a separate light source device, it can be manufactured to be light and thin, and can be easily implemented as a stretchable display device.

On the other hand, the display device provides a touch-based input method that allows a user to easily and intuitively input information or a name by breaking away from a conventional input method such as a button, a keyboard, and a mouse. In order to provide such a touch-based input method, it is necessary to recognize the presence or absence of a user's touch and to accurately detect the touch coordinates.

In this case, the stretchable display device is implemented as a touchable stretchable display device by embedding a touch panel including touch electrodes in an organic light emitting display panel to provide a touch-based input method.

In order to implement a stretchable touch display device, it is necessary to secure the reliability of the organic light emitting display panel. In this case, in order to protect the organic light emitting display panel from moisture, air, foreign substances or physical impacts that may occur during the manufacturing process, an encapsulation layer or the like should be formed on the front surface. Therefore, it is not easy to dispose the touch sensor and/or the touch wiring in the organic light emitting display panel due to the encapsulation layer.

In addition, in the stretchable touch display device, when the substrate is bent, cracks may occur as the touch sensor and/or the touch wiring are stretched or reduced due to stress caused by stretching. When a crack occurs in the touch sensor and/or the touch wiring, normal touch signal transmission is not performed, so it is not possible to determine whether the user's touch is present or not, and it is difficult to accurately detect the touch coordinates. may lead to the failure of

Accordingly, the inventors of the present invention found that the stretchable touch display device not only causes complexity and difficulty in the process, but also uses the touch sensor and/or touch wiring to normally enable touch sensing without degrading display performance due to the encapsulation layer. It was recognized that it is difficult to dispose in an organic light emitting display panel.

In addition, the inventors of the present invention minimize the defect of the stretchable touch display device and arrange the touch sensor and/or the touch wiring in the organic light emitting display panel, and the stress applied to the touch sensor and/or the touch wiring when the substrate is bent. The need to minimize this was recognized.

Therefore, the inventors of the present invention have devised a new structure in which the stretchable touch display device has a touch sensor and/or touch wiring that does not degrade display performance, and in which cracks in the touch sensor and/or touch wiring are minimized. did it

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A touch display device according to an embodiment of the present invention is an organic light emitting display panel including a plurality of touch electrodes positioned on an encapsulation layer, wherein each touch electrode includes a closed loop wiring connecting vertices, 2n (n≥≥3) vertices are configured to face the center of the touch electrode and to be symmetrical.

The touch electrode is characterized in that the closed loop wiring is stretched by bending of the organic light emitting display panel to become a straight line.

The closed-loop wiring has a spiral or wavy shape.

The touch electrode is an electrode having a mesh structure in which a plurality of closed loop wirings are continuously arranged.

The touch electrode is a transparent electrode composed of nanowires, mixed nanoparticles, tanson nanotubes (CNT), graphene, or a conductive polymer.

The nanowire may include silver (Ag), gold (Au), or copper (Cu).

The touch display device may further include a curved first bridge connecting the touch electrodes in the same row or the same column.

The touch display device further includes a curved second bridge connecting the first bridge and other touch electrodes in the same row or the same column, and an insulating layer is disposed between the first bridge and the second bridge.

The touch display device may further include a planarization layer between the encapsulation layer and the touch electrode.

The first bridge or the second bridge is stretched by bending of the display panel to become a straight line.

The first bridge or the second bridge is helical or wavy.

The first bridge and the second bridge are transparent bridges made of nanowires, mixed nanoparticles, tanson nanotubes (CNT), graphene, or a conductive polymer.

The nanowire may include silver (Ag), gold (Au), or copper (Cu).

The organic light emitting display panel may further include a curved driving signal wiring, a curved sensing signal wiring, and a circuit unit.

In the touch electrode, at least one of the touch electrodes located in the same row or the same column is electrically connected to the driving signal wiring, and at least one of the touch electrodes located in a different row or column from the touch electrode connected to the driving signal wiring is connected to the sensing signal wiring. It is electrically connected, and the circuit unit supplies a touch driving signal through a driving signal line and senses the presence or absence of a touch or a touch position with a touch sensing signal received through the sensing signal line.

According to another embodiment of the present invention, a display device includes a touch sensor disposed on a display panel in which a plurality of sub-pixels are arranged, wherein the touch sensor is configured to prevent damage when the display panel is bent. It is characterized in that it is implemented in a multi-directional stretch shape.

The multidirectional stretchable shape has at least six vertices, and each vertex is a variable polygonal closed-loop structure connected by a curved line.

A plurality of curved wires are spaced apart from each other by a predetermined distance to constitute a touch sensor having a mesh structure.

The touch sensor is connected by a bridge having a variable curved shape.

The touch sensor and the curved bridge are both linearly stretched and contracted to absorb the stretching stress.

According to the present invention, when the stretchable touch display device is bent, stretching stress can be minimized and cracks of the touch sensor can be minimized by having a touch sensor configured with a closed loop wiring.

Effects according to the embodiments of the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a block diagram of a stretchable touch display device according to an embodiment of the present invention.
2A is a block diagram illustrating an organic light emitting display panel according to an exemplary embodiment of the present invention.
2B is a block diagram illustrating a touch panel embedded in an organic light emitting display panel according to an exemplary embodiment of the present invention.
3 is a diagram of a stretchable touch display device according to an embodiment of the present invention.
4 is a diagram illustrating a parasitic capacitance between a touch sensor and/or a touch wire and an electrode in a stretchable touch display device according to an embodiment of the present invention and an effect on touch sensitivity thereby.
5 is a diagram illustrating a touch panel included in a stretchable touch display device according to an embodiment of the present invention.
6 is a diagram illustrating a touch sensor and/or touch wiring provided in a stretchable touch display device according to an embodiment of the present invention.
7 is a diagram illustrating a modification of the touch sensor and/or touch wiring of FIG. 6 .
8 to 10 are diagrams illustrating a touch sensor and/or touch wiring provided in a stretchable touch display device according to another embodiment of the present invention.
11 is a view illustrating a cross section AA′ of the touch panel of FIG. 5 .
12 is a view illustrating a cross section BB′ of the touch panel of FIG. 5 .
13 is a view showing a cross-section of a touch panel according to another embodiment of the present invention.

Advantages and features of the present specification and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present specification are exemplary, and thus the present specification is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless specifically stated otherwise. In interpreting the components, it is interpreted as including an error range even if there is no separate explicit description.

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between two parts unless 'directly' is used. Reference to a device or layer “on” another device or layer includes any intervening layer or other device directly on or in the middle of another device. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It should be understood that each component may be “interposed” or “connected,” “coupled,” or “connected” through another component.

Although first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present invention.

The size and thickness of each component shown in the drawings are illustrated for convenience of description, and the present invention is not necessarily limited to the size and thickness of the illustrated component. Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a stretchable touch display device according to an embodiment of the present invention. The stretchable touch display device according to an embodiment of the present invention may include an organic light emitting display panel and a touch panel. 2A is a block diagram illustrating an organic light emitting display panel according to an exemplary embodiment of the present invention, and FIG. 2B is a block diagram illustrating a touch panel embedded in the organic light emitting display panel according to an exemplary embodiment of the present invention. 1, 2A, and 2B are schematic diagrams illustrating a circuit structure of a stretchable touch display device, and will be described together for convenience of description.

1 , the stretchable touch display device 100 may include an organic light emitting display panel 110 , a data driving circuit 120 , a gate driving circuit 130 , and a touch sensing circuit 140 . can

The data driving circuit 120 may drive the data lines DL disposed on the organic light emitting display panel 110 . For example, during the display period, the data driving circuit 120 may supply a data voltage to the plurality of sub-pixels SP through the data line DL.

The gate driving circuit 130 may drive the gate lines GL disposed on the organic light emitting display panel 110 . For example, during the display period, the gate driving circuit 130 may supply a scan signal to the plurality of sub-pixels SP through the gate line GL.

The organic light emitting display panel 110 may be configured to perform a function of a touch panel (TP) on which a touch sensor for touch sensing and/or touch wires are disposed. That is, a plurality of touch sensors (or touch electrodes) and/or touch wires may be embedded in the organic light emitting display panel 110 . In this case, the touch panel TP may mean components necessary for touch sensing in the organic light emitting display panel 110 , and may refer to an aggregate of touch sensors and/or touch wires disposed on the organic light emitting display panel 110 . .

The touch sensing circuit 140 may sense whether a user touches a touch and/or a touch position by using a touch sensor and/or touch wires disposed on the organic light emitting display panel 110 .

As shown in FIG. 2A , in the organic light emitting display panel 110 , a plurality of data lines (Data, Line, DL) and a plurality of gate lines (Gate Line, GL) are disposed to display an image, and a plurality of data lines are disposed. A plurality of sub-pixels SP defined by the line DL and the plurality of gate lines GL may be arranged.

The touch panel TP according to an embodiment of the present invention may be touch driven in a mutual-capacitance method and may be touch driven in a self-capacitance method. In the embodiment of the present invention, a touch structure according to a mutual-capacitance type touch driving will be described as an example, but the present invention is not limited thereto.

As shown in FIG. 2B , when the touch panel TP has a mutual-capacitance-based touch structure, the touch sensors and/or touch wires disposed on the touch panel TP may have roles and functions In the aspect, it is divided into a driving electrode (or a transmission electrode) and a sensing electrode (or a reception electrode).

In this case, the touch sensing circuit 140 supplies a touch driving signal to the touch sensor and/or touch wire corresponding to the driving electrode, and senses the touch received (detected) from the touch sensor and/or the touch wire corresponding to the sensing electrode. A touch presence and/or touch coordinates are acquired based on the signal.

The stretchable touch display device 100 displays an image using an organic light emitting diode (OLED). Hereinafter, a sub-pixel (SP) structure (or sub-pixel circuit) in the organic light emitting display panel 110 for displaying an image using an organic light emitting diode (OLED) will be described.

3 is a diagram of a stretchable touch display device according to an embodiment of the present invention.

3 is a cross-sectional view schematically illustrating a position of a touch sensor (TS) and/or a touch wire in the organic light emitting display panel 110 according to embodiments of the present invention.

As shown in FIG. 3 , an organic light emitting diode (OLED) 113 is positioned on the substrate 111 . In this case, the substrate 111 may support the encapsulation layer 115 and the touch panel (TP) 150 . In this case, the substrate 111 may be made of an elastic material. Accordingly, when the stretchable touch display device 100 is bent, the substrate 111 may be stretched. Accordingly, the substrate 111 may be referred to as an elastic substrate whose length may be increased or decreased in a specific direction. For example, the elastic substrate may be made of polyimide (PI), but is not limited thereto.

A plurality of pixels including an organic light emitting diode 113 may be positioned on the substrate 111 . The organic light emitting diode 113 (a first electrode (anode or cathode electrode) E1), an organic light emitting layer (Emitting Layer) (EL), and a second electrode (cathode electrode or anode electrode) (E2), etc. may be formed. In this case, in the organic light emitting display panel 110 , the touch sensor TS and/or the touch wiring may be disposed on the encapsulation layer 115 positioned on the organic light emitting diode 113 .

The encapsulation layer 115 may be disposed on the second electrode E2 of the organic light emitting diode 113 to cover the second electrode E2 . In this case, the encapsulation layer 115 may also cover side portions of the first electrode E1 and the organic light emitting layer EL. Accordingly, the encapsulation layer 115 may be disposed on the substrate 111 and may encapsulate a plurality of pixels including the organic light emitting diode 113 . Accordingly, the encapsulation layer 115 may protect the organic material included in the organic light emitting layer EL included in the organic light emitting diode 113 from moisture, air, or the like.

At this time, the encapsulation layer (or encapsulation unit) 115 may be a single layer or a multi-layer metal layer, may be a single layer or a multi-layer inorganic layer, at least one organic layer and at least one inorganic layer are laminated. it might be

Also, when the stretchable touch display device 100 is bent, the encapsulation layer 115 may be bent. Accordingly, the encapsulation layer 115 is an elastic encapsulation layer 115 that can increase or decrease in length in a specific direction. As described above, a touch structure in which the touch sensor TS of the touch panel TP and/or the touch wiring is formed on the encapsulation layer 115 is referred to as a touch on encapsulation (TOE).

4 is a diagram illustrating a parasitic capacitance between a touch sensor and/or a touch wire and an electrode in a stretchable touch display device according to an embodiment of the present invention and an effect on touch sensitivity thereby.

As shown in FIG. 4 , a touch driving signal having a predetermined voltage may be applied to the touch sensor TS and/or the touch wiring during the touch sensing period. In this case, a potential difference may be generated between the second electrode E2 and the touch sensor TS and/or the touch wire positioned on the touch panel TP 150 to form a capacitance Cp. The capacitance required for touch sensing is a capacitance between the touch sensor TS and/or a touch wire, or requires a capacitance between the touch sensor TS and/or a touch wire and a touch object (eg, a finger, a pen, etc.). Accordingly, the capacitance Cp formed between the second electrode E2 and the touch sensor TS and/or the touch wiring corresponds to the parasitic capacitance. When the touch sensor (TS) and/or the touch wiring are formed on the encapsulation layer 115 and the touch panel (TP) 150 is embedded in the organic foot and the display panel, the touch sensor (TS) and/or the touch wiring The distance D between the second electrodes E2 may be close. In this case, the parasitic capacitance Cp between the touch sensor TS and/or the touch wire and the second electrode E2 may increase. Accordingly, a resistive-capacitive delay (RC) may also increase.

The distance D between the touch sensor TS and/or the touch wiring and the second electrode E2 may be a predetermined distance or more. In this case, the encapsulation layer 115 may be formed to have a predetermined thickness or more. Accordingly, the parasitic capacitance Cp between the touch sensor TS and/or the touch wire and the second electrode E2 may be reduced, and thus, the RC delay may be reduced. Accordingly, by improving the touch sensitivity, the touch sensor TS and/or the touch wiring may accurately detect the presence or absence of a touch and detect the touch coordinates. Accordingly, defects of the stretchable touch display device 100 may be minimized. In this case, the thickness of the encapsulation layer 115 may be, for example, 5 μm or more, but the present invention is not limited thereto.

In this case, the touch sensor TS and/or the touch wire disposed on the encapsulation layer are an elastic touch sensor (or elastic touch block) TS and/or an elastic touch wire that may increase or decrease in length in a specific direction. That is, the stretchable touch display device 100 may be configured by disposing an elastic touch sensor TS and/or an elastic touch wire on the elastic encapsulation layer 115 .

5 is a diagram illustrating a touch panel included in a stretchable touch display device according to an embodiment of the present invention. 5 is a plan view illustrating a TOE structure for mutual-capacitance-based touch sensing. The present invention will be described with an example of a mutual-capacitance-based touch sensing, but is not limited thereto.

5 , the touch panel TP 150 includes a plurality of touch sensors TS, signal wires Lt and Lr, and bridges Bt and Br. The plurality of touch sensors TS are connected through bridges Bt and Br. Also, the plurality of touch sensors TS may be connected to the signal wires Lt and Lr, and may be electrically connected to the touch sensing circuit (or circuit unit) through the signal wires Lt and Lr.

The touch sensor TS receives a touch driving signal, receives a touch sensing signal when a user touches the touch sensor TS, and senses the presence or absence of a user's touch and/or a touch position.

Each touch sensor TS includes a touch wire. In this case, the touch wiring may be implemented as a closed loop structure having a polygonal shape. Specifically, each of the touch sensors TS may be formed in a structure in which the touch wiring, which is the closed loop wiring 156 , is continuously repeated. That is, each touch sensor TS may be formed of a plurality of closed loop wirings 156 having different perimeters. In this case, the closed-loop wiring 156 has a structure in which the area occupied by the wiring per unit area is maximized. Accordingly, the closed loop wiring 156 may be densely disposed per unit area. Accordingly, the touch sensor TS may be configured as an elastic touch sensor TS having an elastic structure, and the elastic touch sensor TS may include a plurality of different ring electrodes. Accordingly, the closed loop wiring 156 may be referred to as a ring electrode. In this case, the closed loop wiring 156 may have an overall curved shape, or a partially straight line and partially curved shape.

When the stretchable touch display device is bent, the touch sensor TS may be bent. In this case, the plurality of closed loop wires 156 constituting the touch sensor TS may be bent. The closed loop wiring 156 may have a curved shape. The curved line may be transformed into a straight line when the stretchable touch display device is bent. Specifically, the closed loop wiring 156 or the ring electrode may have a curved shape gradually close to a linear shape in proportion to a distance at which the substrate is stretched or a distance at which the encapsulation layer is stretched. Accordingly, cracks in the touch sensor TS may be minimized.

The touch sensor TS may be a transparent electrode made of nanowires, mixed nanoparticles, carbon nanotubes (CNT), graphene, or a conductive polymer. In this case, the nanowire may include, for example, silver (Ag), gold (Au), or a ring (Cu). Accordingly, it is easy to form the closed loop wiring 156 constituting the touch sensor TS. Accordingly, the shapes of the plurality of closed loop wirings 156 having different perimeters may be at least one of a wave shape, a star shape, a flower shape, and a cogwheel shape. In this case, the closed loop wiring 156 constituting the touch sensor may be formed by a specific process. In this case, the specific process may be, for example, an electrospinning process, but the present invention is not limited thereto.

In addition, since the touch sensor TS is formed of a transparent electrode, an influence on the light emitting performance of the sub-pixel may be minimized, and thus the touch sensor TS may be embedded in the organic light emitting display panel.

Also, the closed loop wiring 156 may have a symmetrical shape with respect to the center of the touch sensor TS. When the stretchable touch display device is bent, the plurality of closed loop wires 156 constituting the touch sensor TS may be bent and stretched. In this case, the stretching stress applied to the closed loop wiring 156 may be uniformly distributed along the symmetrical shape. Accordingly, the stretch stress that the touch sensor TS receives may be reduced. In this case, each of the closed loop wirings 156 may have a symmetrical shape in a specific direction or a symmetrical shape in all directions. When each of the closed loop interconnections 156 is symmetrical in all directions, the stretching stress may be more uniformly distributed. Accordingly, the stretch stress applied to the touch sensor TS may be reduced, and cracks of the touch sensor TS may be minimized.

The plurality of touch sensors TS may be configured to include a plurality of driving electrodes Tx and a plurality of receiving electrodes Rx. The plurality of driving electrodes Tx and the plurality of receiving electrodes Rx may be configured in a line shape. Therefore, the driving electrode Tx has a structure in which some of the plurality of touch sensors TS are located in the same row or the same column, and the receiving electrode Rx has a structure in which some of the plurality of touch sensors TS are located in the same row or the same column. is the structure

For example, if the driving electrode Tx is composed of a plurality of touch sensors TS positioned in the same row in a line form, the receiving electrode Rx is a plurality of touch sensors TS positioned in the same column in a line form. can be configured.

At this time, the driving electrode Tx and the receiving electrode Rx should not be electrically connected. Specifically, the driving electrode Tx positioned in the same row or column and the receiving electrode Rx positioned in the same row or column should not be electrically connected in the crossing region.

The bridges Bt and Br may include a driving bridge Bt and a receiving bridge Br. In this case, an insulating layer is positioned between the driving bridge Bt and the receiving bridge Br in the intersection region of the driving bridge Bt and the receiving bridge Br. Accordingly, the insulating layer may prevent an electrical connection between the driving bridge Bt and the receiving bridge Br, thereby preventing a short circuit. Accordingly, the driving electrode Tx and the receiving electrode Rx may not be electrically connected in the crossing region.

The driving bridge Bt and the receiving bridge Br may be curved lines. When the stretchable touch display device is bent, the bridges Bt and Br may be bent. In this case, the curved line may be stretched and transformed into a straight line. Specifically, the curved wiring of the driving bridge Bt and the receiving bridge Br may have a curved shape gradually close to a linear shape in proportion to a stretching distance of the substrate or a stretching distance of the encapsulation layer. Accordingly, cracks in the bridges Bt and Br may be minimized. In this case, the driving bridge Bt and the receiving bridge Br may have, for example, a spiral shape or a wavy shape, but is not limited thereto.

The bridges (Bt, Br) may be transparent electrodes made of nanowires, mixed nanoparticles, carbon nanotubes (CNT), graphene, or a conductive polymer. In this case, the nanowire may include, for example, silver (Ag), gold (Au), or a ring (Cu). Accordingly, it is easy to form the curved driving bridge Bt and the receiving bridge Br. In this case, the bridges (Bt, Br) may be formed by a specific process. In this case, the specific process may be, for example, an electrospinning process, but the present invention is not limited thereto.

In addition, since the bridges Bt and Br are formed as transparent electrodes, the influence on the light emitting performance of the sub-pixels can be minimized, and thus, the bridges Bt and Br can be embedded in the organic light emitting display panel.

The driving bridge (or first bridge) Bt may electrically connect the touch sensors TS positioned in the same row or the same column. In this case, the touch sensor TS may be a driving electrode Tx. Accordingly, the plurality of driving electrodes Tx positioned in the same row or the same column in the form of a line and electrically connected by the driving bridge Bt may constitute the driving electrode Tx line.

For example, the driving electrode Tx 151a at the point t1, the driving electrode Tx 151b at the t2 point, the driving electrode Tx at the t3 point, and the driving electrode Tx at the t4 point are connected to the driving bridge Bt. ) to form one driving electrode (Tx) line.

In addition, the driving bridge Bt not only connects one driving electrode Tx and another adjacent driving electrode Tx, but also a plurality of continuously repeated closed loop wirings 156 constituting one driving electrode Tx. ) can be electrically connected.

For example, a plurality of closed loop wirings 156 constituting one driving electrode Tx 151a at point t1 are electrically connected by a driving bridge Bt to form one driving electrode Tx. can

The reception bridge (or the second bridge) Br may electrically connect the touch sensors TS located in the same row or the same column. In this case, the touch sensor TS may be the receiving electrode Rx. Accordingly, a plurality of receiving electrodes Rx located in the same row or the same column in the form of a line and electrically connected by the receiving bridge Br constitute the receiving electrode Rx line.

For example, the receiving electrode (Rx) 153b at the point r1, the receiving electrode (Rx) 153a at the r2 point, the receiving electrode Rx at the r3 point, and the receiving electrode Rx at the r4 point are connected to the receiving bridge Br ) to form one receiving electrode (Rx) line.

In addition, the receiving bridge Br not only connects one receiving electrode Rx and another adjacent receiving electrode Rx, but also a plurality of continuously repeated closed loop wirings 156 constituting one receiving electrode Rx. ) can be electrically connected.

For example, a plurality of closed loop wirings 156 constituting one receiving electrode (Rx) 153b at point r1 are electrically connected by a receiving bridge Br to constitute one receiving electrode Rx. can

In this case, the plurality of driving electrodes Tx, the plurality of receiving electrodes Rx, and the receiving bridge Br may be located on the same layer. Also, the plurality of driving electrodes Tx, the plurality of receiving electrodes Rx, and the receiving bridge Br may be formed of the same material in the same process. Accordingly, the receiving electrode Rx line may be integrally formed. The present invention has been described as an example that the plurality of receiving electrodes Rx and the receiving bridge Br are located on the same layer, and the receiving bridge Br is located below the driving bridge Bt in the crossing region, but this It is not limited, and the driving electrode Tx and the driving bridge Bt may be located on the same layer. In this case, the receiving bridge Br may be located on another layer, and the driving bridge Bt may be located below the receiving bridge Br in the crossing region.

The plurality of signal wires Lt and Lr may include a plurality of driving signal wires Lt and a plurality of reception signal wires Lr. In this case, at least one of the touch sensors located in the same row or the same column may be electrically connected to the driving signal line Lt. In addition, at least one of the touch sensors electrically connected to the driving signal line Lt and the touch sensors located in a different row or different column may be electrically connected to the sensing signal line Lr. That is, each driving signal line Lt may be connected to each driving electrode Tx line, and each receiving signal line Lr may be connected to each receiving electrode Rx line.

The plurality of signal lines Lt and Lr may be curved lines. That is, the driving signal line Lt and the receiving signal line Lr may have a curved shape. When the stretchable touch display device is bent, the signal wires Lt and Lr may be bent. In this case, the curved line may be stretched and deformed into a straight line. In detail, the curved driving signal wiring Lt and the curved receiving signal wiring Lr may have a curved shape gradually close to a linear shape in proportion to the stretching distance of the substrate or the stretching distance of the encapsulation layer. Accordingly, cracks in the signal lines Lt and Lr may be minimized. In this case, the driving signal wiring Lt and the receiving signal wiring Lr may have, for example, a spiral shape or a wavy shape, but are not limited thereto.

The curved driving signal wiring and the receiving signal wiring may be connected to the touch sensing circuit. At this time, the touch sensing circuit 140 supplies the touch driving signal to the driving electrode Tx line through the curved driving signal line Lt, and is input from the receiving electrode Rx line through the curved receiving signal wiring Lr. By receiving the touch sensing signal, the presence or absence of a touch or the position of the touch may be checked.

6 is a diagram illustrating a touch sensor and/or touch wiring provided in a stretchable touch display device according to an embodiment of the present invention. 7 is a diagram illustrating a modification of the touch sensor and/or touch wiring of FIG. 6 . 6 is a plan view illustrating some of the touch sensors among a plurality of touch sensors configured with closed loop wiring, and FIG. 7 is a plan view illustrating that the touch sensor is bent and the closed loop wiring is deformed when the stretchable touch display device is bent. to be. For convenience of explanation, Figs. 6 and 7 will be described together.

As shown in FIG. 6 , the touch sensors 151 and 153 receive a touch signal, and receive the touch sensing signal when the user touches the touch sensor to sense the user's touch presence and/or touch location.

When the stretchable touch display device is bent, the organic light emitting display panel may be bent. In this case, the touch sensors 151 and 153 are embedded in the organic light emitting display panel. The touch sensors 151 and 153 embedded in the organic light emitting display panel may be implemented in a multi-directional stretch shape.

The touch sensors 151 and 153 implemented in a multidirectional stretchable shape may have an overall curved shape, or a partially linear shape and a partially curved shape. In this case, in order to sense the touch sensors 151 and 153 implemented in a multi-directional stretchable shape while minimizing an error in the presence or absence of a touch and/or a touch position, the wiring constituting the touch sensors 151 and 153 should have a sufficient area and number. In addition, in the touch sensors 151 and 153 implemented in a multidirectional stretchable shape, a plurality of curved wires are spaced apart from each other by a predetermined distance to configure a mesh structure. In this case, the touch sensors 151 and 153 having a mesh structure may be configured to be connected by bridges Bt and Br having a variable curved shape. Accordingly, the touch sensors 151 and 153 implemented in a multi-directional stretchable shape may include a driving electrode 151 and a receiving electrode 153 . In this case, the touch sensor should be configured so that a short circuit does not occur due to the electrical connection between the driving electrode 151 and the receiving positive electrode 153 .

Accordingly, a curved line connecting the vertices of the closed loop wiring 156 constituting the touch sensors 151 and 153 implemented in a multidirectional stretchable shape should be configured in consideration of these factors.

Specifically, the closed loop wiring 156 constituting the touch sensors 151 and 153 has a plurality of vertices. The plurality of vertices may be symmetrically disposed to face the center of the touch sensor. In addition, in the touch sensor, a plurality of ring electrodes are continuously arranged to constitute an electrode having a mesh structure. In this case, Equation 1 represents an equation related to the structure of the closed loop wiring 156 or the ring electrode.

··· 식 1

... Equation 1

Specifically, Equation 1 is an expression showing the total number of vertices included in one closed-loop wiring 156 . In this case, a vertex may not exist between one vertex and another adjacent vertex. Also, one vertex and another adjacent vertex may be connected by a curved line.

The value of n in Equation 1 is a value representing the directional stability of the touch sensors 151 and 153 . N is a natural number greater than or equal to 3. Directional stability means that when the organic light emitting display panel is bent, cracks of the touch sensors 151 and 153 can be minimized even if the closed loop wirings 156 constituting the touch sensors 151 and 153 are stretched and contracted in n specific directions. It means that there are characteristics In this case, the specific direction refers to a direction in which the organic light emitting display panel is bent and the closed loop wiring 156 constituting the touch sensors 151 and 153 is stretched.

7 , when the organic light emitting display panel is bent, the touch sensors 151 and 153 may be stretched and deformed by a specific force. When the organic light emitting display panel is bent, the closed loop wiring 156 constituting the touch sensors 151 and 153 may extend in the direction of the arrow. At this time, the wiring between one vertex of the closed loop wiring 156 and another adjacent vertex may be stretched to form a straight line.

As shown in FIG. 6 , the total number of vertices of one closed loop wiring 156 constituting the touch sensors 151 and 153 may be, for example, eight. Accordingly, corresponding to Equation 1, the value of n may be 4, and one closed-loop interconnection 156 may extend in four directions. Accordingly, since the touch sensors 151 and 153 have 4-way stability, cracks in the touch sensors 151 and 153 can be minimized. That is, as the total number of vertices of one closed loop wiring 156 increases, the directional stability of the touch sensors 151 and 153 may increase by half of the total number of vertices.

In this case, the total number of vertices of one closed-loop interconnection 156 may be determined in consideration of a width of the closed-loop interconnection 156 , an interval between the closed-loop interconnection 156 and another closed-loop interconnection 156 adjacent thereto, and the like.

In this case, the width of the closed loop wiring 156 may be determined in consideration of the arrangement of the organic light emitting diodes under the touch sensors 151 and 153 . Specifically, the touch sensors 151 and 153 may be disposed to minimize the influence on the optical characteristics of the organic light emitting diode. For example, the optical characteristics of the organic light emitting diode include, but are not limited to, luminance, color characteristics, and viewing angle. Therefore, the touch sensors 151 and 153 should be arranged to minimize the effect on the emission of light when a plurality of pixels including the organic light emitting diode emit light to the outside to display an image. Accordingly, the touch sensors 151 and 153 may be disposed so as not to overlap the plurality of pixels including the organic light emitting diode as much as possible. In this case, the width of the closed loop wiring 156 may be, for example, 20 μm or less. Also, when the width of the closed loop wiring 156 is less than 3 μm, it may not be easy to stretch the closed loop wiring 156 when the organic light emitting diode display is bent. Accordingly, the width of the closed loop wiring 156 may be, for example, 3 μm or more. That is, the width of the closed loop wiring 156 is suitable in a range of 3 μm to 20 μm, but the present invention is not limited thereto.

Also, a distance between the closed loop wiring 156 and another adjacent closed loop wiring 156 may be determined in consideration of resistance stability of the touch sensors 151 and 153 . In addition, the closed loop wiring 156 and another closed loop wiring 156 adjacent to the closed loop wiring 156 should be spaced apart from each other by a predetermined distance so that current does not flow and interference does not occur. Accordingly, an interval between the closed loop interconnection 156 and another adjacent closed loop interconnection 156 may be at least the width of the closed loop interconnection 156 . In this case, another closed loop wiring 156 adjacent to the closed loop wiring 156 should be densely arranged in consideration of the presence or absence of a touch and/or accuracy of sensing the touch position. Accordingly, it is preferable that the closed loop wiring 156 and the adjacent closed loop wiring 156 be spaced apart by 1.2 times the width of the closed loop wiring 156, but the present invention is not limited thereto.

That is, the total number of vertices of one closed loop wiring 156 is the width of the closed loop wiring 156 in consideration of the arrangement of the organic light emitting diode and the closed loop wiring ( 156) may be determined in consideration of the interval between them.

Accordingly, in order to facilitate arrangement while the plurality of curved wirings form a mesh structure, the multidirectional stretchable shape has at least 6 vertices, and each vertex is variable connected by curved wiring. It is a closed-loop structure with possible polygonal shapes.

In the touch sensors 151 and 153 having a variable polygonal closed-loop structure, when the organic light emitting diode display is bent, curved lines may be deformed into a straight line. In this case, the curved wiring is stretched so that the stretching stress may be dispersed. For example, it can be said that the closed-loop wiring 156, which is a curved wiring, constitutes the touch sensors 151 and 153 having a closed-loop structure of a polygonal shape variable in a spiral or wavy shape.

That is, the touch sensors 151 and 153 implemented in a multidirectional stretchable shape and the bridges Bt and Br having a variable curve shape are stretched and contracted together in a linear shape to absorb the stretch stress. Accordingly, the stretch stress received by the touch sensors 151 and 153 implemented in the multidirectional stretchable shape may be reduced, and cracks of the touch sensors 151 and 153 may be minimized.

8 to 10 are diagrams illustrating a touch sensor and/or touch wiring provided in a stretchable touch display device according to another embodiment of the present invention. The touch sensor and/or touch wiring illustrated in FIGS. 8 to 10 differs only in shape from the touch sensor and/or touch wiring illustrated in FIGS. 5 and 6 , but other structures are substantially the same, and thus a redundant description will be omitted.

As shown in FIG. 8 , the shape of the closed loop wiring 256 constituting the touch sensors 251,253 may be a star shape. At this time, one closed-loop wiring 256 may have six vertices, and the vertices and vertices have a closed-loop structure of a variable polygonal detective connected by a curved wiring. In this case, the six vertices of one closed-loop interconnection 256 are the minimum number of vertices that a variable polygonal closed-loop structure can have. Accordingly, when the organic light emitting display panel is bent, the curved wiring may be deformed into a linear shape, and the curved wiring may be stretched, so that the stretching stress may be dispersed. At this time, since one closed-loop wiring 256 has three-way stability, it can be stretched in three directions, so that cracks of the touch sensors 251,253 can be minimized.

As shown in FIG. 9 , the shape of the wiring 356 constituting the touch sensors 351 and 353 may be a toothed wheel shape. In this case, one wiring 356 constituting the touch sensors 351 and 353 may have a plurality of vertices, and the vertices and vertices have a variable structure that is connected by a straight line or curved wiring 356 . In this case, one wiring 356 constituting the touch sensors 351 and 353 may have a concave-convex structure while having a plurality of vertices. Accordingly, one wire 356 constituting the touch sensors 351 and 353 may have the maximum number of vertices per unit area. Accordingly, when the organic light emitting display panel is bent, the shape of the wiring 356 constituting the touch sensors 351 and 353 is more easily deformed. That is, as the number of vertices of the wiring 356 constituting the touch sensors 351 and 353 increases, directional stability of the touch sensors 351 and 353 can be improved, so that the stretch stress that the touch sensors 351 and 353 receives can be dispersed. . Accordingly, cracks in the touch sensors 351 and 353 may be minimized.

As shown in FIG. 10 , the shape of the closed loop wiring 456 constituting the touch sensors 451 and 453 may be a flower shape. In this case, the closed-loop wiring 456 may have a plurality of vertices, and the vertices and vertices have a variable structure connected to each other by a straight line or curved line. In this case, a curved concave-convex structure may be provided between the vertex and the adjacent vertex. Accordingly, the closed loop wiring 456 may have the maximum number of vertices per unit area. Accordingly, directional stability of the touch sensors 451 and 453 may be improved. Also, when the organic light emitting display panel is bent, the wiring having the curved concavo-convex structure may be more easily transformed into a straight line. Accordingly, the stretching stress received by the touch sensors 451 and 453 may be dispersed, and cracks of the touch sensors 451 and 453 may be minimized.

11 is a view illustrating a cross section A-A' of the touch panel of FIG. 5 . 12 is a view illustrating a cross section B-B' of the touch panel of FIG. 5 . 11 and 12 are cross-sectional views illustrating a touch sensor and a bridge provided in the touch panel of FIG. 5 . Since the actual structure is the same as that described with reference to FIG. 5 , a redundant description will be omitted.

11 , a plurality of driving electrodes 151a and 151b may be positioned on the encapsulation layer 115 . The plurality of driving electrodes 151a and 151b may be covered with an insulating layer 159 . A driving bridge Bt may be positioned on the insulating layer 159 . The insulating layer 159 may include a contact hole. In this case, the driving bridge Bt may electrically connect the driving electrode 151a and another adjacent driving electrode 151b through a contact hole provided in the insulating layer 159 .

In addition, the closed loop wiring constituting the plurality of driving electrodes 151a and 151b may be covered with an insulating layer 159 . In this case, the driving bridge Bt may electrically connect the closed loop wiring provided in the single driving electrodes 151a and 151b through a contact hole provided in the insulating layer 159 .

A receiving bridge Br may be positioned on the encapsulation layer 115 . The receiving bridge Br may be positioned on the same layer as the driving electrodes 151a and 151b. In this case, the receiving bridge Br may be covered with an insulating layer 159 . Accordingly, the insulating layer 159 may be positioned between the driving bridge Bt and the receiving bridge Br in the intersection region of the driving bridge Bt and the receiving bridge Br. Accordingly, the insulating layer 159 may prevent an electrical connection between the driving bridge Bt and the receiving bridge Br, thereby preventing a short circuit.

12 , a plurality of receiving electrodes 153a and 153b may be positioned on the encapsulation layer 115 . Also, a receiving bridge Br may be positioned on the encapsulation layer 115 . In this case, the plurality of receiving electrodes 153a and 153b and the receiving bridge Br may be formed in the same process. Accordingly, the receiving electrodes 153a and 153b and the receiving bridge Br may be positioned on the same layer.

The receiving bridge Br may electrically connect the receiving electrode 153a and another adjacent receiving electrode 153b. In addition, the receiving bridge Br may electrically connect the closed loop wiring included in one of the receiving electrodes 153a and 153b. In this case, the plurality of receiving electrodes 153a and 153b and the receiving bridge Br may be covered with an insulating layer 159 . A driving bridge Bt may be positioned on the insulating layer 159 . Accordingly, the insulating layer 159 may be positioned between the driving bridge Bt and the receiving bridge Br at the intersection of the receiving bridge Br and the driving bridge Bt. Accordingly, the insulating layer 159 may prevent an electrical connection between the driving bridge Bt and the receiving bridge Br, thereby preventing a short circuit.

13 is a view showing a cross-section of a touch panel according to another embodiment of the present invention. 13 is substantially the same as that of FIG. 11 except that the planarization layer 117 is included, and thus a redundant description thereof will be omitted.

13 , the planarization layer 117 is disposed between the encapsulation layer 115 and the touch sensors 151a and 151b. In this case, the planarization layer 117 may planarize the upper surface of the encapsulation layer 115 to facilitate the formation of the touch sensors 151a and 151b. In addition, the planarization layer 117 may minimize parasitic capacitance that may occur between the touch sensors 151a and 151b and an electrode positioned thereunder. Therefore, it is possible to reduce the RC delay. Accordingly, the touch sensors 151a and 151b can accurately detect the presence or absence of a touch and detect the touch coordinates. In this case, the thickness of the planarization layer 117 may be, for example, 2 μm to 5 μm.

In addition, the touch sensors 151a and 151b and the planarization layer 117 in this case may be formed of an organic material. For example, the planarization layer may be formed of one of polyimide (PI) and photoacrylate (PAC), but is not limited thereto.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made within the scope without departing from the technical spirit of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: stretchable touch display device
110: organic light emitting display panel
113: organic light emitting diode
115: encapsulation layer
120: data driving circuit
130: gate driving circuit
140: touch sensing circuit
150: touch panel
151, 153, 251, 253, 351, 353, 451, 453: touch sensor

Claims (20)

An organic light emitting display panel having a plurality of touch electrodes positioned on an encapsulation layer, the organic light emitting display panel comprising:
The plurality of touch electrodes are connected to each other by a bridge of a variable curved shape,
In the plurality of touch electrodes, at least one of the touch electrodes positioned in the same row is electrically connected to a variable curved driving signal line,
The plurality of touch electrodes are disposed such that at least one of the touch electrodes positioned in the same column intersects the driving signal wiring, and is electrically connected to a variable curved sensing signal wiring,
Each of the touch electrodes is configured in a form in which closed loop wiring in the form of a curve connecting between a plurality of 2n (n≥3) vertices is continuously arranged in a radial direction,
Each of the closed loop wiring is configured to face the center of the touch electrode and to be symmetrical. The method of claim 1,
In the touch electrode, each of the closed loop wires is stretched and formed into a straight line by bending in n specific directions, which are directions in which the organic light emitting display panel is bent and the closed loop wires are stretched and contracted. 3. The method of claim 2,
The closed loop wiring has a spiral or wavy shape of a touch display device. delete 3. The method of claim 2,
The touch electrode is a transparent electrode composed of nanowires, mixed nanoparticles, carbon nanotubes (CNT), graphene, or a conductive polymer. 6. The method of claim 5,
The nanowire is a touch display device including silver (Ag), gold (Au), or copper (Cu). 3. The method of claim 2,
The bridge includes a curved first bridge connecting the touch electrodes in the same row. 8. The method of claim 7,
The bridge may further include a curved second bridge connecting the first bridge and the touch electrode disposed in a different column, and an insulating layer is disposed between the first bridge and the second bridge. 9. The method of claim 8,
The touch display device may further include a planarization layer disposed between the encapsulation layer and the touch electrode. 9. The method of claim 8,
The first bridge or the second bridge is stretched by bending of the display panel to become a straight line. 11. The method of claim 10,
The first bridge or the second bridge may have a spiral or wavy shape. 12. The method of claim 11,
The first bridge and the second bridge are transparent bridges made of nanowires, mixed nanoparticles, carbon nanotubes (CNT), graphene, or a conductive polymer, the touch display device. 13. The method of claim 12,
The nanowire is a touch display device including silver (Ag), gold (Au), or copper (Cu). 9. The method of claim 8,
The organic light emitting display panel may further include a curved driving signal wiring, a curved sensing signal wiring, and a circuit unit. 15. The method of claim 14,
The circuit unit supplies a touch driving signal to the driving signal wiring and senses the presence or absence of a touch or a touch position with a touch sensing signal received through the sensing signal wiring. A display device comprising a plurality of touch sensors disposed on a display panel in which a plurality of sub-pixels are arranged, the display device comprising:
The plurality of touch sensors are connected to each other by a bridge of a variable curved shape,
In the plurality of touch sensors, at least one of the touch sensors located in the same row is electrically connected to a variable curved driving signal wire,
The plurality of touch sensors are arranged such that at least one of the touch sensors located in the same column intersects the driving signal wiring, and is electrically connected to the variable curved sensing signal wiring,
The touch sensor is implemented in a form in which closed-loop wiring in a multi-directional stretchable shape that is prevented from being damaged when the display panel is bent is continuously arranged in a radial direction. 17. The method of claim 16,
The multidirectional stretchable shape includes at least six vertices, each vertex being connected to the closed loop wiring. delete delete 17. The method of claim 16,
The touch sensor and the curved bridge are both linearly stretched and contracted to absorb stretch stress.

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