KR102423596B1 - Force sensing panel and touch display device having the same - Google Patents

Abstract

Embodiments of the present invention relate to a touch display device, and more particularly, a force sensing panel in which air bubbles do not occur between a bent area and a non-bent area of a display panel, thereby minimizing an effect on display performance, and including the same It relates to a touch display device. According to embodiments of the present invention, a force sensing panel comprising the same and a force sensing panel having improved display performance by implementing a touch display device having a structure in which it is easy to discharge bubbles generated between a bending area and a non-bending area of a display panel A touch display device may be provided.

Description

Force sensing panel and touch display device including same

Embodiments of the present invention relate to a force sensing panel and a touch display device including the same.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms, and in recent years, various display devices such as a liquid crystal display device and an organic light emitting display device are utilized.

Among these display devices, there is a touch display device that provides a touch-based input method that allows a user to easily and intuitively and conveniently input information or commands by breaking away from a conventional input method such as a button, a keyboard, and a mouse.

Meanwhile, recently, as a user interface environment such as a force touch or an application requiring 3D touch information is built, a touch display device capable of sensing the touch force is being researched and developed.

In addition, design elements of display devices are becoming an important factor in determining the purchase of display devices, and accordingly, research and development are being conducted to make the display devices have various shapes.

As an example of a display device having an improved design, there is a curved display device in which a side of a display panel is bent.

In order to implement a force touch in such a curved display device, a force touch sensor structure is generally attached to a rear surface of a display panel.

In this case, while the force touch sensor structure is attached to the back surface of the bent display panel, bubbles may be generated between the attachment surfaces due to the curvature of the display panel. This occurs particularly frequently between a bent area and an unbent area of the display panel.

Due to the bubbles generated when the display panel and the force touch sensor structure are attached, the force touch function may be deteriorated in the area where the bubbles are generated or in the entire area of the display panel.

Therefore, there has been a need to remove air bubbles generated on the attachment surface of the display panel and the force touch sensor structure.

Against this background, an object of the embodiments of the present invention is to provide a force sensing panel that minimizes the effect on display performance by not generating bubbles between the bending area and the non-bending area of the display panel, and a touch display device including the same is to provide

Another object of the embodiments of the present invention is to provide a force sensing panel having a structure that facilitates discharging air bubbles generated between a bent area and a non-bent area of a display panel, and a touch display device including the same.

Another object of the embodiments of the present invention is to provide a force sensing panel capable of implementing a force touch function in a bending area of a display panel and a touch display device including the same.

In addition, the object of the embodiments of the present invention is not limited thereto, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, embodiments of the present invention provide a force sensing panel without a force sensing panel and a touch display device including the same between a bending area and a flat area of the display panel.

Embodiments of the present invention provide a force sensing panel and a touch display device including the same, having a bubble evacuation structure in which the force sensing panel is only partially positioned between a bending area and a flat area of the display panel.

In addition, embodiments of the present invention provide a force sensing panel capable of realizing a force touch function in a bending area of a display panel and a touch display device including the same.

As described above, according to embodiments of the present invention, bubbles are not generated between the bent area and the non-bended area of the display panel, thereby minimizing the influence on display performance.

According to the embodiments of the present invention, a force sensing panel having improved display performance by implementing a structure for easily discharging air bubbles generated between a bending area and a non-bending area of a display panel, and a touch display device including the same can provide

In addition, according to embodiments of the present invention, it is possible to provide a force sensing panel in which a force touch function is implemented in a bending area of a display panel and a touch display device including the same.

1 is a diagram schematically illustrating a touch display device according to embodiments of the present invention.
2 is a diagram schematically illustrating a system configuration of a touch display device according to embodiments of the present invention.
FIG. 3 is a view showing a cross-section of a portion of FIG. 1 .
4 is a diagram exemplarily illustrating an operation of a touch display device according to embodiments of the present invention.
5 is a diagram exemplarily illustrating a touch sensor of a touch display device according to embodiments of the present invention.
6 is a diagram exemplarily illustrating a touch sensor of a touch display device according to embodiments of the present invention.
7 is a diagram exemplarily illustrating another touch sensor of a touch display device according to embodiments of the present invention.
8 is a diagram illustrating another implementation example of the touch sensor of FIG. 7 .
9 is a diagram illustrating another implementation example of the touch sensor of FIG. 7 .
10 is a diagram exemplarily showing a circuit of a touch display device according to embodiments of the present invention.
11 is a diagram exemplarily showing a circuit of a touch display device according to embodiments of the present invention.
12 is a diagram illustrating a cross-section of some components of a touch display device according to embodiments of the present invention.
13 is a diagram exemplarily illustrating operations of some components of the touch display device of FIG. 12 .
14 is a view showing a cross-section of a part of FIG. 8 .
FIG. 15 is a view showing a cross-section of another part of FIG. 8 .
16 is a diagram conceptually illustrating effects according to embodiments of the present invention.

Hereinafter, some embodiments of the embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components in each drawing, the same components may have the same reference numerals as much as possible even though they are displayed in different drawings. In addition, in describing the embodiments of the present invention, if it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the embodiments of the present invention, the detailed description may be omitted.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. 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.

1 is a diagram schematically showing a touch display device according to embodiments of the present invention, FIG. 2 is a diagram schematically showing a system configuration of a touch display device according to embodiments of the present invention, and FIG. 3 is FIG. 1 is a view showing a cross-section of a part, FIG. 4 is a view exemplarily showing an operation of a touch display device according to embodiments of the present invention, and FIG. 5 is a view showing a touch of a touch display device according to embodiments of the present invention It is a diagram exemplarily showing a sensor, FIG. 6 is a diagram exemplarily showing a touch sensor of a touch display device according to embodiments of the present invention, and FIG. 7 is another diagram of a touch display device according to embodiments of the present invention. It is a view showing a touch sensor by way of example, FIG. 8 is a view showing another implementation example of the touch sensor of FIG. 7 , FIG. 9 is a view showing another implementation example of the touch sensor of FIG. 7 , and FIG. 10 is a diagram of the present invention It is a diagram exemplarily showing a circuit of a touch display device according to embodiments, FIG. 11 is a diagram exemplarily showing a circuit of a touch display device according to embodiments of the present invention, and FIG. 12 is an embodiment of the present invention It is a view showing a cross-section of some components of the touch display device according to the above, FIG. 13 is a view exemplarily showing the operation of some components of the touch display device of FIG. 12, and FIG. 14 is a cross-section of a part of FIG. 15 is a cross-sectional view of another part of FIG. 8, and FIG. 16 is a view conceptually illustrating effects according to embodiments of the present invention.

1 is a diagram schematically illustrating a touch display device according to embodiments of the present invention.

Referring to FIG. 1 , in the touch display apparatus 100 according to embodiments of the present invention, at least a portion is bent, and in particular, one or more bending portions corresponding to a bending area (BA) and a flat area ( and a display panel 110 having a flat portion corresponding to a flat area (FA).

The display panel 110 of the touch display device 100 may be of various types such as an organic light emitting diode panel (OLED Panel), a liquid crystal display panel (LCD Panel), and the like. Hereinafter, for convenience of description, an organic light emitting diode panel (OLED Panel) will be mainly described as an example.

The display panel 110 may have one or more bending parts. One bending part is located on both sides, and a flat part is located between the bending parts, so that both sides are bent as shown in FIG. 1 . have.

In addition, the display panel 110 may have a touch sensor 340, which will be described later, in which electrical characteristics are changed due to a touch.

In addition, the force sensing panel 120 provided to sense the force of the touch may be positioned under the display panel 110 . This will also be described in detail later.

Meanwhile, schematically looking at the system of the touch display apparatus 100 with reference to FIG. 2 , the touch display apparatus 100 may include a display panel 110 and a force sensing panel 120 .

In the display panel 110, for image display, a plurality of data lines and a plurality of gate lines are disposed, a plurality of subpixels defined by the plurality of data lines and a plurality of gate lines are arranged, and a plurality of data lines and a display driving circuit for driving the plurality of gate lines.

In addition, the touch display apparatus 100 may include a touch sensing circuit TSC for driving and sensing the touch sensor 340 .

The touch sensing circuit TSC supplies a driving signal to the display panel 110 in order to drive the touch sensor 340 , detects a sensing signal from the display panel 110 , and based on this, whether there is a touch and/or a touch The position (touch coordinates) can be sensed.

The touch sensing circuit TSC may include a touch driving circuit that supplies a driving signal and receives a sensing signal, and a touch controller that calculates the presence or absence of a touch and/or a touch position (touch coordinates).

Meanwhile, the force sensing panel 120 may include a signal line for force sensing, and may include a force sensing circuit FSC that drives the signal line.

The force sensing circuit FSC may apply a force driving signal to the force sensing panel 120 to drive the force sensor, receive the force sensing signal from the force sensing panel 120, and sense the force of the touch based on this. have.

The force sensing circuit FSC may include a force driving circuit FDC for supplying a driving signal and receiving a sensing signal, a force controller F-CTR for calculating a magnitude of a touch force, and the like.

Due to the touch sensing circuit TSC and the force sensing circuit FSC described above, the presence or absence of a touch, the touch coordinates (position), and the force of the touch may be derived together.

Referring to FIG. 3 , FIG. 3 is a cross-sectional view taken along line A-A′ of FIG. 1 , and shows the vertical structure of the touch display device 100 of FIG. 1 .

A cover glass 310 may be positioned at the top of the touch display device 100 .

The cover glass 310 protects the upper portion of the display panel 110 , and between the cover glass 310 and the touch sensor 340 (or touch electrode) while an object such as a finger is in contact with the upper surface of the cover glass 310 . Creates a capacitance (capacitance) in

The cover glass 310 may be made of reinforced glass, transparent plastic, or a transparent film. As an example, the cover glass 310 may include at least one of sapphire glass and gorilla glass. As another example, the cover glass 310 may include any one of polyethyleneterephthalate (PET), polycarbonate (PC), polyethersulfone (PES), polyethylenapthanate (PEN), and polynorborneen (PNB).

The optical adhesive 320 is positioned under the cover glass 310 . The optical adhesive 320 may be OCA (Optical Clear Adhesive) or OCR (Optical Clear Resin).

Meanwhile, a decoration layer (not shown) may be positioned between the cover glass 310 and the optical adhesive 320 . The decoration layer serves to increase the aesthetic sense by imparting a pattern to the cover glass 310 and is located only in the bending area BA of the display panel 110 to bring an aesthetic feeling differentiated from the flat area FA. .

A polarization layer 330 is positioned under the optical adhesive 320 . The polarization layer 330 is bonded to the cover glass 310 via the optical adhesive 320 . The polarizing layer 330 may be made of a polarizing film or the like, and may serve to improve visibility of the display panel 110 by preventing reflection by external light.

The touch sensor 340 may be positioned under the polarization layer 330 .

The touch sensor 340 may sense a touch by sensing a change in capacitance due to the touch.

The touch sensor 340 includes a plurality of touch electrodes for sensing a touch by a mutual-capacitance-based touch sensing method or a plurality of touches for sensing a touch by a self-capacitance-based touch sensing method. It may be an electrode or one including these. This will be described later.

An encapsulation layer 350 may be positioned under the touch sensor 340 . The encapsulation layer 350 serves to protect the organic light emitting device from oxygen or moisture.

A pixel array substrate 360 may be included under the encapsulation layer 350 .

The pixel array substrate 360 displays an image corresponding to a data signal supplied from the display driving circuit, and may include, for example, a base substrate and a pixel array.

The base substrate may be a PI (Polyimide) film made of a flexible material, but is not limited thereto.

A pixel array may be included on the upper surface of the base substrate.

The pixel array includes a switching transistor (not shown) connected to the aforementioned gate line and data line, a driving transistor (not shown) receiving a data signal from the switching transistor, and an organic light emitting device that emits light by a data current supplied from the driving transistor. (not shown) may be included. The organic light emitting device includes an anode connected to the driving transistor, an organic light emitting layer on the anode electrode, and a cathode electrode on the organic light emitting layer. In addition, each pixel may be divided and defined due to a bank pattern. Since the detailed structure of the pixel array is well known, it will be omitted.

At one edge of the base substrate, there is a pad portion (not shown) connected to each signal line provided in the pixel array, and the pad portion is connected to the display driving circuit.

The connection between the pad part and the display driving circuit may be, for example, a chip on film (COF) type in which a driving element is mounted on a film using a circuit film, but is not limited thereto, and TCP (Tape Carrier Package) , it may be a well-known connection method such as COG (Chip on Glass).

A back plate 370 is positioned under the base substrate. The back plate 370 is attached under the pixel array substrate 360 and serves to protect the lower portion of the pixel array substrate 360 .

The display panel 110 including the above-described polarization layer 330 , the touch sensor 340 , the encapsulation layer 350 , the pixel array substrate 360 , and the back plate 370 detects a touch of a finger or an object. It may be implemented in the form of an in-cell type touch display panel capable of touch sensing.

A force sensing panel 120 positioned below the display panel 110 and having a force sensor whose electrical characteristics change due to a touch applied to the display panel 110 may be further included.

However, a buffer layer such as a foam pad may be positioned between the force sensing panel 120 and the lower portion of the display panel 110 , that is, between the back plate 370 .

The force sensing panel 120 is bonded to the rear surface of the display panel 110 to sense a touch force such as a finger or an object. It may have a sensor.

Such a force sensor may be implemented in the form of sensing a change in a resistance value due to a force of a touch.

Referring to FIG. 4 , due to the force of the touch applied on the display panel 110 , an external force is applied to the force sensing panel 120 having the force sensor, and thus two electrodes or lines spaced apart are in contact. The force sensor may sense the touch force by detecting a change in the resistance value generated while doing so.

That is, in this case, the touch force is detected as a change in the resistance value of the force sensor. This will be described later in more detail.

Meanwhile, the touch display apparatus 100 may include a touch sensor 340 in the display panel 110 , and the touch sensor 340 may sense a touch based on capacitance formed in the touch electrode. can

The touch display apparatus 100 is a capacitance-based touch sensing method, and as shown in FIG. 5 , may sense a touch in a mutual-capacitance-based touch sensing method, and as shown in FIG. 6 , self-capacitance (Self). -capacitance)-based touch sensing method may be used to sense a touch.

5 and 6 are two implementation examples of a touch electrode in the touch display device 100 according to embodiments of the present invention. It is an exemplary view of a touch electrode when sensing a touch, and FIG. 6 is an exemplary view of a touch electrode when the touch display apparatus 100 senses a touch using a self-capacitance-based touch sensing method.

Referring to FIG. 5 , in the case of the mutual-capacitance-based touch sensing method, a plurality of touch electrodes form a driving touch electrode (also referred to as a driving line) to which a driving signal is applied, and a sensing signal and form capacitance with the driving electrode. sensing touch electrodes (also referred to as sensing lines).

Referring to FIG. 5 , among the driving touch electrodes Driving TE in the touch electrode, the driving touch electrodes disposed in the same row (or the same column) are electrically connected by an integrated method (or by a bridge pattern connection method). They are connected to each other to form one driving touch electrode line DEL.

Referring back to FIG. 5 , among the sensing touch electrodes Sensing TE in the touch electrode, the sensing touch electrodes disposed in the same column (or the same row) are electrically connected to each other by the bridge pattern BP (or by the integration method). They are connected to each other to form one sensing touch electrode line SEL.

However, as the touch electrode is implemented in the display panel 110 having the bending area and the flat area, the touch electrode of FIG. 5 may be bent in the bending portion and may maintain a flat state in the flat portion.

In this mutual-capacitance-based touch sensing method, the touch sensing circuit TSC applies a driving signal to one or more driving touch electrode lines DEL, and receives a sensing signal from one or more sensing touch electrode lines SEL. And, based on the received sensing signal, based on the change in capacitance (mutual-capacitance) between the driving touch electrode line DEL and the sensing touch electrode line SEL according to the presence of a pointer such as a finger or a pen, touch presence and/or Detect touch coordinates and the like.

Referring to FIG. 5 , each of a plurality of driving touch electrode lines DEL and a plurality of sensing touch electrode lines SEL is electrically connected to a touch driving circuit through one or more touch lines TL in order to transmit a driving signal and a sensing signal. is connected to

More specifically, each of the plurality of driving touch electrode lines DEL is electrically connected to the touch driving circuit through one or more driving touch lines TLd for driving signal transmission. In addition, in order to transmit a sensing signal, each of the plurality of sensing touch electrode lines SEL is electrically connected to the touch driving circuit through one or more sensing touch lines TLs.

Meanwhile, referring to FIG. 6 , in the case of the self-capacitance-based touch sensing method, each touch electrode TE has a role of a driving touch electrode (applying a driving signal) and a role of a sensing touch electrode (a sensing signal). detection).

That is, a driving signal is applied to each touch electrode, and a sensing signal is received through the touch electrode to which the driving signal is applied. Accordingly, in the self-capacitance-based touch sensing method, there is no distinction between the driving electrode and the sensing electrode.

In this self-capacitance-based touch sensing method, the touch sensing circuit (TSC) applies a driving signal to one or more touch electrodes, receives a sensing signal from the touch electrode to which the driving signal is applied, and receives the sensing signal. Based on a change in capacitance between a pointer such as a finger or a pen and a touch electrode, the presence or absence of a touch and/or touch coordinates are detected.

Referring to FIG. 6 , each of the plurality of touch electrodes is electrically connected to the touch driving circuit through one or more touch lines TL to transmit a driving signal and a sensing signal.

As such, the touch display apparatus 100 may sense a touch using a mutual-capacitance-based touch sensing method or may sense a touch using a self-capacitance-based touch sensing method.

On the other hand, the touch display device 100 may be an external type in which the touch sensor 340 is manufactured separately from the display panel 110 and bonded to the display panel 110 , but it is manufactured and displayed together when the display panel 110 is manufactured. It may be a built-in type existing inside the panel 110 .

Hereinafter, for convenience of description, it is assumed that the touch sensor 340 is a built-in type existing inside the display panel 110 . In this case, the touch line TL is a signal line existing inside the display panel 110 .

Meanwhile, referring to FIG. 7 , the aforementioned force sensing panel 120 includes the first force sensing panel 121 corresponding to the flat part of the display panel 110 and the bending part of the display panel 110 . It may include a second force sensing panel 123 , and may have a cutout 700 between the first force sensing panel 121 and the second force sensing panel 123 .

That is, on the rear surface of the display panel 110 , the cutout 700 is positioned between the first force sensing panel 121 and the second force sensing panel 123 , and the bending portion and the flat portion of the display panel 110 are There may be a region in which the force sensing panel 120 does not exist in the rear region between them. In this case, the cutout 700 means a portion in which the force sensing panel 120 is not cut while a portion of the force sensing panel 120 in the longitudinal direction is cut.

The cutout 700 is located in the entire area between the first force sensing panel 121 and the second force sensing panel 123 as shown in FIG. 7 , and the first force sensing panel 121 and the second force sensing panel are The panel 123 may be separated, and may be positioned at a predetermined interval between the first force sensing panel 121 and the second force sensing panel 123 as shown in FIG. 8 , and as shown in FIG. 9 , the first A plurality of pieces may be positioned at regular intervals between the force sensing panel 121 and the second force sensing panel 123 .

As described above, between the first force sensing panel 121 and the second force sensing panel 123 , the cutout 700 in which the force sensing panel 120 does not exist is included, and the force is applied to the rear surface of the display panel 110 . Air bubbles generated while the sensing panel 120 is attached are discharged through the cutout 700 , or the cutout 700 is located in the entire area between the first force sensing panel 121 and the second force sensing panel 123 . While the force sensing panel 120 is not attached, air bubbles may not be generated.

That is, due to air bubbles generated while the force sensing panel 120 is attached to the rear surface of the display panel 110 , the force-touch performance of the touch display apparatus 100 can be prevented from being deteriorated.

Referring to FIG. 14 , FIG. 14 is a cross-section taken along line B-B' of FIG. 8 , and shows the vertical structure of the touch display panel 100 .

In FIG. 14 , which is a cross-section taken along line B-B' of FIG. 8 , the force sensing panel 120 is positioned at the lowermost portion corresponding to the bending portion of the display panel 110 , and corresponding to the area between the bending portion and the flat portion. The force sensing panel 120 is also located on the rear surface, and the force sensing panel 120 is also located at the bottom of the vertical structure corresponding to the flat part.

In contrast, in FIG. 15 , which is a cross-section taken along line C-C' in FIG. 8 , the force sensing panel 120 is positioned at the bottom of the vertical structure corresponding to the bent part of the display panel 110 and corresponds to the flat part. Although the force sensing panel 120 is also located at the bottom of the vertical structure, the force sensing panel 120 is not located on the rear surface corresponding to the area between the bending part and the flat part.

Therefore, air is discharged between the first force sensing panel 121 and the second force sensing panel 123 or the cutout 700 is formed between the first force sensing panel 121 and the second force sensing panel ( 123), as it is located in the entire area, the possibility of generating air bubbles can be fundamentally blocked.

Meanwhile, the aforementioned force sensing circuit FSC may be implemented as one or more components (eg, an integrated circuit), and may be implemented separately from the display driving circuit or the touch sensing circuit TSC.

That is, the force sensing circuit FSC may be included outside the touch sensing circuit TSC ( FIG. 10 ) or included inside the touch sensing circuit TSC ( FIG. 11 ).

Meanwhile, referring to FIG. 12 , the force sensing panel 120 may include a first substrate 1210 and a second substrate 1220 , a resistor member 1230 , and a gap structure member 1240 facing each other.

The first substrate 1210 may be made of a transparent plastic material, for example, a polyethyleneterephthalate (PET) material. The first substrate 1210 may include a plurality of first sensor electrodes Tx.

The second substrate 1220 may be made of the same transparent plastic material as that of the first substrate 1210 , for example, PET, and is positioned to face the first substrate 1210 . The second substrate 1220 may include a second sensor electrode Rx.

And, as described above, since the force sensing panel 120 does not exist in the cutout 700 , portions of the first substrate 1210 and the second substrate 1220 are cut in the cutout 700 . .

The first sensor electrode Tx may be positioned on the upper surface of the first substrate, and each of the plurality of first sensor electrodes Tx may be provided in a bar shape to have a constant interval. Each of these first sensor electrodes (Tx) serves as a driving electrode for sensing the force touch by being connected to the force sensing circuit (FSC) through a routing wire or the like.

The second sensor electrode Rx is positioned on the rear surface of the second substrate 1220 and may be made of a transparent conductive material. The second sensor electrode Rx may be provided in a bar shape to have a constant interval. Each of these second sensor electrodes (Rx) serves as a sensing electrode for sensing the force touch by being connected to the force sensing circuit (FSC) through a routing wire or the like.

In addition, the first sensor electrode Tx and the second sensor electrode Rx may be spaced apart from each other.

As described above, a plurality of first sensor electrodes Tx and a plurality of second sensor electrodes Rx positioned between the first substrate 1210 and the second substrate 1220 and intersecting each other may be defined as force sensors. . That is, a component having a structure in which two spaced apart electrodes change electrical characteristics according to the force of the touch, more specifically, a resistance value between the two spaced electrodes, may be defined as a force sensor.

Meanwhile, the first sensor electrode Tx and the second sensor electrode Rx may be provided opposite to each other. That is, one of the first sensor electrode Tx and the second sensor electrode Rx may be a transmitting electrode to which a driving signal is applied, and the other may be a receiving electrode to which a sensing signal is applied. For example, the first sensor electrode Tx may be a transmitting electrode for transmitting a driving signal or may be used as a receiving electrode conversely, and the second sensor electrode Rx may be a receiving electrode receiving a sensing signal, but conversely, a transmitting electrode may be used as

The first sensor electrode Tx and the second sensor electrode Rx may be implemented in a matrix form while crossing each other as shown in FIG. 12 , and the first sensor electrode Tx and the second sensor electrode Rx are spaced apart from each other. can be located

When the force of the touch on the display panel 110 is generated, the first sensor electrode Tx and the second sensor electrode Rx are at least one of the plurality of first sensor electrodes Tx to the plurality of second sensor electrodes ( Rx) may be in contact with at least one to form a resistor Rm. However, while the first sensor electrode Tx and the second sensor electrode Rx are adjacent to each other, the capacitance between the two electrodes may change.

Meanwhile, the resistor member 1230 is provided in a region where the first sensor electrode Tx and the second sensor electrode Rx face each other. The resistor member 1230 forms a resistor Rm in a region where the first sensor electrode Tx and the second sensor electrode Rx face each other according to a user's force touch.

The resistance Rm is determined according to the contact area between the resistor member 1230 and the first sensor electrode Tx and the second sensor electrode Rx according to the user's force touch (or contact load) with respect to the second substrate 1220 . By changing the value, the user's force touch can be sensed.

That is, as shown in FIG. 13 , due to the user's force touch FT, the resistor member 1230 comes into contact between the first sensor electrode Tx and the second sensor electrode Rx. It is possible to sense the presence and size of the user's force touch (FT) by sensing a change in the resistance value according to the contact area.

The resistor member 1230 according to an example is a pressure-sensitive adhesive material based on any one of quantum tunneling composites (QTC), electro-active polymer (EAP), acrylic, and rubber-based solvents. , or a piezo-resistive material.

Here, the pressure-sensitive adhesive material has a property of varying resistance according to an area. And, when an external force is applied to the silicon semiconductor crystal, the piezoresistive material has a piezoresistive effect in which the specific resistance is changed as the electric charge moves to the conduction band by generating energy. .

Meanwhile, in order to recognize the user's force touch FT, between the resistor member 1230 between the first sensor electrode Tx and the second sensor electrode Rx, that is, the first substrate 1210 and the second substrate In order to provide a gap between the 1220 , a gap structure member 1240 may be further included.

The gap structure member 1240 provides a gap space (or a vertical gap) between the first substrate 1210 and the second substrate 1220 and adheres the first substrate 1210 and the second substrate 1220 to each other to face each other. . For example, the gap structural member 1240 may be an adhesive having a cushion material. The gap structure member 1240 functions as a support for supporting the first substrate 1210 and the second substrate 1220 with the gap space therebetween.

In addition, the force sensing panel 120 may further include a spacer 1250 . The spacer 1250 is interposed between the first sensor electrode Tx and the second sensor electrode Rx facing each other to maintain a gap space between the first substrate 1210 and the second substrate 1220 or use a user force. It functions to restore the pressed or bent first substrate 1210 to its original position after the touch.

Referring to FIG. 16 for the touch display device 100 having the above structure, the force sensing panel 120 is not located on the rear surface corresponding to the area between the bending part and the flat part, so the display panel 110 and the force Since air generated when the sensing panel 120 is bonded may be discharged, a decrease in the force sensing function of the touch display apparatus 100 may be prevented and display performance may be improved.

As described above, according to embodiments of the present invention, bubbles are not generated between the bent area and the non-bended area of the display panel, thereby minimizing the influence on display performance.

According to the embodiments of the present invention, a force sensing panel having improved display performance by implementing a structure for easily discharging air bubbles generated between a bending area and a non-bending area of a display panel, and a touch display device including the same can provide

In addition, according to embodiments of the present invention, it is possible to provide a force sensing panel in which a force touch function is implemented in a bending area of a display panel and a touch display device including the same.

In the above, even though all the components constituting the embodiment of the present invention are described as being combined or operating in combination, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the components may operate by selectively combining one or more.

In addition, terms such as "comprises", "comprises" or "have" described above mean that the corresponding component may be embedded, unless otherwise stated, excluding other components. Rather, it should be construed as being able to include other components further. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the meaning in the context of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, 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. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: touch display device 110: display panel
120: force sensing panel 121: first force sensing panel
123: second force sensing panel 700: cutout
1210: first substrate 1220: second substrate
1230: resistor member 1240: gap structural member

Claims (15)

a display panel in which at least a portion is bent; and
It is located under the display panel and includes a force sensing panel having a force sensor whose electrical characteristics are changed due to the force of the touch,
The display panel is
Having at least one bending part corresponding to the bending area and a flat part corresponding to the flat area,
The force sensing panel,
a first force sensing panel corresponding to the flat part;
and a second force sensing panel corresponding to the bending part,
has a cutout between the first force sensing panel and the second force sensing panel,
The display panel is
a back plate positioned on the force sensing panel;
a pixel array substrate positioned on the back plate;
a touch sensor positioned on the pixel array substrate;
It includes a cover glass positioned on the touch sensor,
The cutout is positioned to overlap the lower portion of the touch sensor,
The bending area is located on the periphery of the flat area,
At least a partial area of the cutout is located in the bending area or the flat area. According to claim 1,
The display panel is
One bending part is located on each side,
A touch display device in which a flat part is positioned between the bending parts. According to claim 1,
The force sensing panel,
a first substrate and a second substrate facing each other; and
and a force sensor positioned between the first substrate and the second substrate and having a plurality of first sensor electrodes and a plurality of second sensor electrodes intersecting each other. 4. The method of claim 3,
The first sensor electrode is located on the upper surface of the first substrate,
The second sensor electrode is located on the rear surface of the second substrate,
The first sensor electrode and the second sensor electrode are spaced apart from each other. 4. The method of claim 3,
When the force of the touch is generated, at least one of the plurality of first sensor electrodes is in contact with or adjacent to at least one of the plurality of second sensor electrodes. 4. The method of claim 3,
One of the first sensor electrode and the second sensor electrode is a transmitting electrode to which a driving signal is applied, and the other is a receiving electrode to which a sensing signal is applied. According to claim 1,
Further comprising a force sensing circuit for driving the force sensor,
The force sensing circuit,
A touch display device that applies a force driving signal to the force sensor and senses the force of the touch by receiving a force sensing signal from the force sensor. 8. The method of claim 7,
The force sensing circuit,
A touch display device included outside the touch sensing circuit or included in the touch sensing circuit. 4. The method of claim 3,
The touch display device further comprising a resistor member provided between the first substrate and the second substrate. 4. The method of claim 3,
The touch display device further comprising a gap structure member for providing a gap between the first substrate and the second substrate. According to claim 1,
The incision is
The touch display device is located in the entire area between the first force sensing panel and the second force sensing panel, and the first force sensing panel and the second force sensing panel are separated. According to claim 1,
The incision is
A touch display device positioned at a predetermined interval between the first force sensing panel and the second force sensing panel. In the force sensing panel having a force sensor whose electrical characteristics are changed due to the force of the touch,
The force sensing panel,
a first substrate;
a second substrate positioned on the first substrate; and
and the force sensor having a plurality of first sensor electrodes positioned on the upper surface of the first substrate and a plurality of second sensor electrodes positioned on the rear surface of the second substrate,
Each of the first substrate and the second substrate has a cutout in which a portion is cut,
The force sensing panel is located below the display panel for image display,
The display panel is
a back plate positioned on the force sensing panel;
a pixel array substrate positioned on the back plate;
a touch sensor positioned on the pixel array substrate;
It includes a cover glass positioned on the touch sensor,
Each of the cut-out portions of the first substrate and the second substrate is positioned to overlap the lower portion of the touch sensor,
The display panel includes a flat area and a bending area positioned around the flat area,
At least a partial region of the cutout of each of the first substrate and the second substrate is positioned in the bending region or in the flat region. 14. The method of claim 13,
The force sensing panel further comprising a resistor member provided between the first substrate and the second substrate. 14. The method of claim 13,
The force sensing panel further comprising a gap structure member for providing a gap between the first substrate and the second substrate.

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