WO2022147668A1

WO2022147668A1 - Touch pad and electronic device

Info

Publication number: WO2022147668A1
Application number: PCT/CN2021/070375
Authority: WO
Inventors: 张�荣; 罗忠波; 阎小霞; 鲁旭
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2022-07-14
Also published as: WO2022147887A1; CN215117465U

Abstract

Provided are a touch pad and an electronic device. The touch pad comprises: a touch panel; a pressure sensor, which is used for converting the deformation of the pressure sensor into a first electrical signal when pressure is applied to the touch panel, the first electrical signal being used for pressure detection; an elastic support, which is used for supporting the pressure sensor, and driving the pressure sensor to have elastic deformation when pressure is applied to the touch pad, together with same; and a piezoelectric ceramic assembly, which comprises a piezoelectric ceramic sheet, wherein the piezoelectric ceramic sheet is used for providing a user with vibration feedback when the first electrical signal is greater than a first threshold value, and the piezoelectric ceramic assembly is fixed below the touch panel in a suspended manner so as to be isolated from the elastic support. By means of the touch pad and the electronic device in the present application, an improvement in the pressure detection precision of the touch pad is facilitated, and continuous pressure can be detected; and the vibration feedback has a good effect, thereby improving the user experience.

Description

Trackpads and Electronics

technical field

The embodiments of the present application relate to the field of electronic technologies, and in particular, to a touch panel and an electronic device.

Background technique

A touchpad is an input device used in electronic equipment to control a screen cursor. The touchpad obtains touch information such as high-resolution finger coordinates by detecting the tiny capacitance changes when the user's finger operates on the panel area, so as to precisely control the screen cursor to move and click. Usually, a single button is also configured on the back of the touchpad, and the functions of the traditional left and right mouse buttons are realized by detecting the behavior of the buttons.

In order to improve the operating convenience of the touchpad, the pressure touchpad has gradually become a new trend. The pressure trackpad cancels the physical buttons of the conventional trackpad and adds pressure sensitivity and vibration feedback.

At present, piezoelectric ceramic-type pressure touch panels have problems such as small vibration, insufficient user experience, low pressure detection accuracy, and inability to detect continuous pressure.

SUMMARY OF THE INVENTION

In view of this, the present application provides a touch panel and an electronic device, which are conducive to improving the pressure detection accuracy of the touch panel, can detect continuous pressure, and have a good vibration feedback effect, thereby improving user experience.

In a first aspect, a touch panel is provided, comprising: a touch panel; a pressure sensor for converting the deformation of the pressure sensor into a first electrical signal when the touch panel is under pressure, the first electrical signal The signal is used for pressure detection; the elastic bracket is used to support the pressure sensor, and when the touch panel is under pressure, it drives the pressure sensor to elastically deform together; the piezoelectric ceramic component including the piezoelectric ceramic sheet, so The piezoelectric ceramic sheet is used to provide vibration feedback to the user when the first electrical signal is greater than a first threshold, wherein the piezoelectric ceramic component is suspended and fixed under the touch panel to be connected with the elastic support isolation.

Under the condition that the piezoelectric ceramic sheet provides vibration feedback, using a pressure sensor for pressure detection can not only improve the pressure detection accuracy, but also detect continuous pressure. Isolation from the elastic bracket used to support the pressure sensor not only makes the vibration of the piezoelectric ceramic sheet not affect the pressure detection of the pressure sensor, but also the piezoelectric ceramic sheet has a stronger vibration sense and a better user experience. Moreover, due to the use of piezoelectric ceramic sheets as the vibration source, the structure is lighter and thinner, and the vibration sensation is more crisp and rich.

In a possible implementation manner, the touchpad further includes:

The fixing structure is used for suspending and fixing the piezoelectric ceramic component under the touch panel.

In a possible implementation, the fixing structure includes glue, double-sided tape, screws, snaps or solder.

Optionally, the piezoelectric ceramic component may be fixed under the touch panel by fixing means such as glue, double-sided tape, screws, snaps or welding. Wherein, the welding may include welding by soldering or spot welding by laser.

The piezoelectric ceramic sheet is suspended and fixed under the touch panel by a fixed structure, which is low-cost and easy to install.

In a possible implementation manner, the piezoelectric ceramic sheet includes a piezoelectric ceramic, a metal substrate, and an electrode, two ends of the metal substrate protrude from the piezoelectric ceramic and the electrode, and the metal substrate Both ends of the sheet are fixed under the touch panel by the fixing structure.

Since the two ends of the metal substrate protrude from the piezoelectric ceramic and the electrodes, the two ends of the metal substrate are fixed under the touch panel by the fixing structure, so that the piezoelectric ceramic component can be suspended and fixed under the touch panel.

In a possible implementation manner, the distance between the fixing structure and the piezoelectric ceramic is greater than or equal to 0.1 mm.

A certain gap is maintained between the fixed structure and the piezoelectric ceramic, so that the fixed structure will not affect the vibration of the piezoelectric ceramic sheet.

In a possible implementation manner, the thickness of the fixing structure ranges from 0.4 mm to 0.6 mm.

The fixed structure maintains a certain thickness. On the one hand, it will not cause the piezoelectric ceramic sheet to contact the touch panel when it vibrates because it is too thin, and on the other hand, it will not increase the thickness of the touch panel because it is too thick.

In a possible implementation manner, the piezoelectric ceramic component further includes: a weight block, fixed on the bottom of the piezoelectric ceramic sheet, for increasing the vibration strength of the piezoelectric ceramic sheet.

The counterweight can increase the force between the piezoelectric ceramic sheet and the circuit board or reinforcing plate below the touch panel, thereby increasing the vibration intensity of the piezoelectric ceramic sheet and making the vibration sound smaller.

In a possible implementation manner, the weight block adopts a rectangular block with a first groove, and the piezoelectric ceramic sheet is arranged in the first groove.

The thickness of the touch panel can be further reduced by arranging the piezoelectric ceramic sheet in the groove of the counterweight.

In a possible implementation manner, the weight block is fixed at or near the center of gravity of the piezoelectric ceramic sheet.

Fix the counterweight at or near the center of gravity of the piezoelectric ceramic sheet, and the piezoelectric ceramic sheet is uniformly stressed. On the one hand, one end of the piezoelectric ceramic sheet will not be under high pressure, which will cause the fixed structure to fall off easily. , the vibration feedback effect will be better.

In a possible implementation manner, the configuration block is a copper block, a lead block or a steel block.

Choose a counterweight block with a higher density, which is small in size but has a good counterweight effect.

In a possible implementation manner, the mass range of the counterweight is between 2.4g-2.6g.

Selecting the weights of the appropriate quality is conducive to enhancing the effect of vibration feedback.

In a possible implementation manner, the piezoelectric ceramic sheet is a single-layer double-sided sheet, a single-layer single-sided sheet, a multi-layer double-sided sheet or an elongated piezoelectric ceramic sheet of a multi-layer single-sided sheet.

The piezoelectric ceramic sheet can be selected by comprehensively considering various factors such as vibration intensity, cost, and driving voltage, which is beneficial to improve the performance of the touch panel.

In a possible implementation manner, the length of the piezoelectric ceramic sheet is about 50 mm, and the width of the piezoelectric ceramic sheet is about 6 mm.

In a possible implementation manner, the touch panel includes a piezoelectric ceramic sheet, and the piezoelectric ceramic sheet is arranged at the center of the touch panel.

In a possible implementation manner, the installation direction of the one piezoelectric ceramic sheet is parallel to the long side or the short side of the touch panel, or the installation direction of the one piezoelectric ceramic sheet is inclined to the touch panel long or short side.

The installation direction of the piezoelectric ceramic sheet can be parallel or inclined to any side of the touch panel, and the installation method is flexible.

In a possible implementation manner, the touch panel includes a plurality of piezoelectric ceramic sheets, and the plurality of piezoelectric ceramic sheets are arranged side by side.

Arranging a plurality of piezoelectric ceramic sheets can improve the vibration strength.

In a possible implementation manner, the touch panel includes a plurality of piezoelectric ceramic sheets, a part of the plurality of piezoelectric ceramic sheets is arranged side by side parallel to a long side of the touch panel, and the plurality of piezoelectric ceramic sheets are arranged side by side in parallel to the long side of the touch panel. The other part of the electric ceramic sheet is arranged side by side parallel to the short side of the touch panel.

Placing a plurality of piezoelectric ceramic sheets evenly at the symmetrical positions of the touch panel can increase the consistency of the vibration intensity at different positions of the touch panel.

In a possible implementation manner, the pressure sensor is fixed under the touch panel through the elastic support.

The pressure sensor is fixed under the touch panel through the elastic bracket, and the elastic bracket drives the deformation effect of the pressure sensor to be better, thereby helping to improve the accuracy of pressure detection.

In a possible implementation manner, the elastic support is provided with a second groove, the tops of the two side walls of the second groove are fixedly connected to the bottom of the touch panel, and the pressure sensor is fixed on the touch panel. The bottom wall of the groove structure.

In a possible implementation manner, the tops of the two side walls extend outward to form steps, and the upper surfaces of the steps are fixedly connected to the lower part of the touch panel.

The elastic bracket adopts a groove structure, and is connected with the touch panel through the outwardly extending step surface, which can enhance the structural strength.

In a possible implementation manner, a third groove is provided on the stack below the touch panel, and the tops of the two side walls of the second groove are fixed in the third groove.

Fixing the elastic support in the groove provided by the stack under the touch panel is beneficial to reduce the thickness of the touch panel.

In a possible implementation manner, the touch panel includes a plurality of pressure sensors, and the projections of the plurality of pressure sensors on the touch panel are located at at least one corner of the touch panel and/or the The center position of at least one side of the touch panel.

By using a plurality of pressure sensors, the pressing force can be dispersed, thereby increasing the structural stability of the touch panel.

In a possible implementation manner, the plurality of pressure sensors are four pressure sensors, and the projections of the four pressure sensors on the touch panel are located at four corners of the touch panel, respectively.

In a possible implementation manner, the plurality of pressure sensors are four pressure sensors, and the projections of the four pressure sensors on the touch panel are respectively located at the center positions of four sides in the touch panel.

In a possible implementation manner, the plurality of pressure sensors are 6 pressure sensors, and the projections of the 6 pressure sensors on the touch panel are respectively located at the positions of 4 corners in the touch panel and all the The center position of the two long sides in the touch panel.

In a possible implementation manner, the plurality of pressure sensors are 8 pressure sensors, and the projections of the 8 pressure sensors on the touch panel are respectively located at the positions of 4 corners in the touch panel and all the The center position of the four sides in the touch panel.

Distributing the pressure sensors at the four corners and the center of the four sides of the touch panel can improve the uniformity of pressure detection.

In a possible implementation manner, the pressure sensor is fixed to the side surface of the touch panel through the elastic bracket, so that the projection of the pressure sensor on the touch panel is located outside the area of the touch panel .

Fixing the pressure sensor on the side of the touch panel can make the thickness of the touch panel smaller.

In a possible implementation, the elastic support adopts a U-shaped sheet structure, the U-shaped sheet structure includes two short axes and one long axis, and the two short axes are fixed to the touch panel In the lower edge area, the pressure sensor is arranged on the short axis, and the long axis extends to the side of the touch panel so that the pressure sensor and the touch panel are located on the same plane.

In a possible implementation manner, the touchpad includes two elastic brackets and four pressure sensors, the two elastic brackets are arranged opposite to each other, and the four pressure sensors are respectively located at a short distance of the two elastic brackets. The position on the axis near the intersection of the short and long axes.

In a possible implementation manner, the touchpad further includes:

The control chip is configured to process the first electrical signal, and control the piezoelectric ceramic sheet to provide vibration feedback to the user when the first electrical signal is greater than the first threshold.

In a possible implementation manner, the touchpad further includes:

a capacitance detection array for converting a capacitance signal obtained by a finger touch into a second electrical signal, where the second electrical signal is used for touch detection;

The control chip is also used for processing the second electrical signal.

Using a single chip for simultaneous pressure detection and touch detection provides faster system response, lower power consumption, and simpler circuitry.

In a possible implementation manner, the control chip is mounted on a circuit board, and the circuit board is fixedly connected to the lower surface of the touch panel.

In a possible implementation manner, the touch panel further includes: reinforcing plates, which are fixedly connected to the lower surfaces of both ends of the circuit board, and are used to increase the rigidity of the touch panel.

Using a reinforcing plate to increase the rigidity of the touch panel can reduce the deformation and collapse when the user presses the touch panel.

In a second aspect, an electronic device is provided, including the first aspect and the touch panel in any implementation manner of the first aspect.

Description of drawings

FIG. 1 is a schematic exploded view of a typical pressure touchpad.

FIG. 2 is a schematic block diagram of a touch panel according to an embodiment of the present application.

FIG. 3 is a schematic diagram of a stack of a touch panel according to an embodiment of the present application.

FIG. 4 is another stacking schematic diagram of the touch panel according to the embodiment of the present application.

5 to 8 show distribution diagrams of pressure sensors in the touch panel according to the embodiment of the present application.

FIG. 9 is a schematic principle diagram of vibration feedback of the piezoelectric ceramic sheet according to the embodiment of the present application.

FIG. 10 is a schematic structural diagram of a piezoelectric ceramic sheet according to an embodiment of the present application.

FIG. 11 is a schematic diagram of the installation of the piezoelectric ceramic sheet according to the embodiment of the present application.

12 to 14 are other structural schematic diagrams of the piezoelectric ceramic sheet according to the embodiment of the present application.

15 to 16 are schematic diagrams showing the installation directions of the piezoelectric ceramic sheets according to the embodiments of the present application.

17 to 20 are distribution diagrams of piezoelectric ceramic sheets according to embodiments of the present application.

21 and 22 are bottom views of the touch panel according to the embodiment of the present application.

FIG. 23 is an exploded schematic diagram of the touch panel according to the embodiment of the present application.

FIG. 24 is an interaction diagram of an internal structure of a touch panel according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

In order to improve the operating convenience of the touchpad, the pressure touchpad has gradually become a new trend. The pressure touchpad refers to the cancellation of the physical buttons of the conventional touchpad, and the addition of pressure sensing and vibration feedback functions.

A typical pressure touchpad uses a linear motor touch scheme. However, the linear motor touch solution mainly has the following problems:

1. The thickness of the structure is large. Occupies the internal battery space of electronic devices and cannot be applied to some thin and light electronic devices;

2. The vibration of the linear motor is more protracted and not crisp;

3. The motor power consumption is large.

Another typical pressure touch panel uses a piezoelectric ceramic touch solution, which is becoming more and more popular due to its thinness and lightness. The embodiments of the present application are implemented based on the piezoelectric ceramic touch control solution.

A typical pressure touch panel implemented based on the piezoelectric ceramic touch solution will be described below with reference to FIG. 1 .

FIG. 1 is an exploded schematic diagram of the pressure touch panel. From top to bottom in Figure 1 are the touch panel, foam, piezoelectric ceramic sheet, and flexible printed circuit (Flexible Printed Circuit, FPC), foam, insulating polyethylene terephthalate (Polyethylene terephthalate, PET) ) gasket, sheet metal bracket and the upper cover of the main unit. Wherein, the touch panel may include a cover plate and a touch printed circuit board (Printed circuit board, PCB). Since the piezoelectric ceramic sheet can also perform pressure detection, the foam can also be called sensor foam.

Specifically, when the user's finger presses the touch panel, the foam under the touch panel transmits the pressure to the piezoelectric ceramic sheet underneath, and the piezoelectric ceramic sheet generates an electrical signal under the positive piezoelectric effect. After the control chip receives the electrical signal Generate a driving signal, and drive the piezoelectric ceramic sheet to generate vibration. The vibration is transmitted to the touch panel through the foam. The upper and lower layers of the piezoelectric ceramic sheet are mainly used to buffer pressure and absorb vibration sound. FPC is used to connect multiple piezoelectric The ceramic sheet transmits electrical signals to the control chip, and the sheet metal bracket and C shell play a supporting role.

Because the piezoelectric ceramic sheet generates a potential difference through the expansion and contraction between the foams, thereby generating an electrical signal for pressure detection, the pressure detection accuracy is low, and the continuous pressure cannot be detected. In addition, a single piezoelectric ceramic sheet has a small vibration sense. , the user experience is insufficient, if you want to increase the vibration sense, you need to install multiple piezoelectric ceramic sheets, and these multiple piezoelectric ceramic sheets need to be driven separately, and the cost is high.

In view of this, the embodiments of the present application provide a touch panel based on the above piezoelectric ceramic touch solution, which can solve the above problems.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various electronic devices.

For example, portable or mobile computing devices such as smartphones, laptops, tablets, gaming devices, and other electronic devices such as electronic databases, automobiles, and bank automated teller machines (ATMs). However, the embodiments of the present application do not limit this.

FIG. 2 shows a schematic structural diagram of the touch panel 100 according to an embodiment of the present application. As shown in FIG. 2 , the touch panel 100 includes:

touch panel 101;

a pressure sensor 102, configured to convert the deformation of the pressure sensor into a first electrical signal when the touch panel is under pressure, and the first electrical signal is used for pressure detection;

The elastic support 103 is used for supporting the pressure sensor, and when the touchpad is under pressure, it drives the pressure sensor to elastically deform together;

A piezoelectric ceramic assembly including a piezoelectric ceramic sheet 104, the piezoelectric ceramic sheet is used to provide vibration feedback to a user when the first electrical signal is greater than a first threshold, wherein the piezoelectric ceramic assembly is suspended and fixed on the The bottom of the touch panel is isolated from the elastic support.

Specifically, in the application embodiment, after the touch panel is subjected to pressure, the pressure is transmitted to the elastic support at the bottom, and the bending of the support will drive the pressure sensor it supports to elastically deform together, and then the pressure sensor converts the detected deformation into electrical The signal is used for pressure detection; when it is detected that the electrical signal converted by the pressure sensor is greater than the first threshold, the piezoelectric ceramic sheet drives the touch panel to vibrate together, and the vibration is fed back to the user. Vibration feedback allows users to determine whether their presses are working, minimizing repetitive gestures.

In the embodiment of the present application, the piezoelectric ceramic component is isolated from the elastic support, which means that the piezoelectric ceramic component is not in contact with the elastic support during the process from non-deformation to deformation of the elastic support; Below the touch panel means that the bottom of the piezoelectric ceramic component is not supported, and there is a gap between the piezoelectric ceramic component and the touch panel.

It should be noted that the first threshold is a specified threshold, which may be obtained through experience. The first threshold may refer to a critical value of the pressing force at which the user can perceive vibration, and the first threshold is greater than 0.

Optionally, the electronic device may store multiple threshold values of pressing force, and the user may select one of them according to usage habits. For example, the electronic device stores a threshold value of light pressing, a threshold value of moderate pressing, and a threshold value of heavy pressing, and the user can select a threshold value from among them according to his habitual pressing force.

Therefore, since the touch panel of the embodiment of the present application adopts the piezoelectric ceramic sheet as the vibration source, the structure is lighter and thinner, and the vibration sense is more crisp and rich. And under the condition of keeping the piezoelectric ceramic sheet to provide vibration feedback, using a pressure sensor for pressure detection can not only improve the pressure detection accuracy, but also detect continuous pressure. In addition, the piezoelectric ceramic component is suspended and fixed under the touch panel. It is isolated from the elastic bracket used to support the pressure sensor, not only the vibration of the piezoelectric ceramic sheet does not affect the pressure detection of the pressure sensor, but also the piezoelectric ceramic sheet has a stronger vibration sense and a better user experience, so that under the same vibration sense , reduce the number of piezoelectric ceramic sheets and reduce costs.

FIG. 3 shows a schematic diagram of a stack of the touch panel 100 provided by the embodiment of the present application.

As shown in FIG. 3 , optionally, in this embodiment of the present application, the touch panel 100 includes:

The circuit board 105, which is fixedly connected to the lower surface of the touch panel, is used for processing the first electrical signal, and when the first electrical signal is greater than the first threshold, controls the piezoelectric ceramic sheet to move to any The user provides vibration feedback.

As shown in FIG. 3 , the circuit board 105 can be attached to the lower surface of the touch panel 101 , for example, the circuit board 105 is fixedly connected to the lower surface of the touch panel 101 through the adhesive 131 . The circuit board 105 can be equipped with electronic components and circuits, and can be used to process electrical signals such as pressure and vibration to realize system setting functions.

Optionally, the circuit board 105 may include a pressure detection chip, a piezoelectric ceramic chip, peripheral circuits, connectors and other main components.

Specifically, the pressure detection chip can determine whether the first electrical signal collected by the pressure sensor reaches the first threshold, and if it reaches the first threshold, it sends a vibration command to the piezoelectric ceramic drive chip. After the piezoelectric ceramic drive chip receives the vibration command , drive the piezoelectric ceramic sheet to vibrate according to the set mode, the piezoelectric ceramic sheet drives the touch panel to vibrate together, and feedback the vibration to the user.

Optionally, in this embodiment of the present application, the touch panel 100 where it is located further includes:

The capacitance detection array is used to convert the capacitance signal obtained by the finger touch into a second electrical signal, and the second electrical signal is used for touch detection.

Optionally, the circuit board 105 can also be used to process the second electrical signal.

That is, the circuit board 105 may further include a touch detection chip, and the touch detection chip and the pressure detection chip may be collectively referred to as a control chip.

Optionally, the surface of the circuit board 105 may have a capacitance detection array composed of copper sheets. When a finger touches, the capacitance detection array converts the capacitance signal into an electrical signal and transmits it to the touch detection chip.

In the embodiment of the present application, the touch detection chip and the pressure detection chip are combined into one, that is to say, a single chip can perform both pressure detection and touch detection, which reduces power consumption and simplifies the circuit structure. System cost is saved, and faster system response can be provided.

FIG. 4 shows another schematic diagram of the stacking of the touch panel 100 provided by the embodiment of the present application. Compared with FIG. 3 , the touch panel 100 in FIG. 4 further includes:

The reinforcing plates 108 are fixedly connected to the lower surfaces of both ends of the circuit board 105 for increasing the rigidity of the touch panel 101 .

Specifically, the reinforcing plate 108 and the circuit board 105 can be attached by the adhesive 134 , and the elastic bracket 103 can be attached to the lower surface of the reinforcing plate 108 by the adhesive 132 .

Optionally, the reinforcing plate adopts aluminum plate or steel plate.

Using the reinforcing plate to increase the rigidity of the touch panel 101 can reduce the deformation and collapse when the user presses the touch panel.

As shown in FIG. 3 and FIG. 4 , the elastic support 103 is fixed under the touch panel 101 .

Specifically, as shown in FIG. 3 , the elastic bracket 103 is fixedly connected to the lower surface of the circuit board 105 . As shown in FIG. 4 , the elastic support 103 is fixedly connected to the lower surface of the reinforcing plate 108 .

Optionally, the elastic support 103 is provided with a second groove, the tops of the two side walls of the second groove are fixedly connected to the bottom of the touch panel 101, and the pressure sensor 102 is fixed on the first groove. Two grooves in the bottom wall.

In one embodiment, the tops of the two side walls extend outward to form a step, the upper surface of the step is fixedly connected with the lower part of the touch panel 101 , and the pressure sensor 102 is fixed in the second groove For example, the upper surface of the step is fixedly connected to the lower surface of the circuit board 105 , or the upper surface of the step is fixedly connected to the lower surface of the reinforcing plate 108 .

Specifically, the upper surface of the step can be fixedly connected to the lower surface of the circuit board 105 or the reinforcing plate 108 through the adhesive 132 . The pressure sensor 102 can be fixedly connected to the bottom wall of the second groove of the elastic support through the adhesive 133 .

In another embodiment, the stack below the touch panel 101 is provided with a third groove, and the tops of the two side walls of the second groove are fixed in the third groove. For example, the lower surface of the reinforcing plate 108 is provided with a third groove, and the tops of the two side walls are fixed in the third groove.

By fixing the elastic support in the groove provided by the stack under the touch panel, it is beneficial to reduce the thickness of the touch panel.

In another embodiment, the two side walls of the elastic support can also adopt inclined surfaces.

It should be understood that the embodiment of the present application does not limit the specific shape of the elastic support, as long as it can support the pressure sensor, and can deform together with the pressure sensor when the touch panel is under pressure.

Optionally, in this embodiment of the present application, the number of elastic supports 103 may be one or multiple. One pressure sensor 102 or multiple pressure sensors 102 can be placed on the bottom wall of an elastic support 103 . If the number of elastic brackets 103 is multiple, the multiple elastic brackets 103 may be independent components, or may be connected as a whole and fixed on the edge regions of the four sides of the circuit board 105 .

The pressure sensor 102 is attached to the elastic bracket 103 , and when the elastic bracket 103 is bent and deformed, the pressure sensor 102 deforms along with the elastic bracket 103 .

Optionally, the touchpad 100 includes a plurality of pressure sensors 102, and the projections of the plurality of pressure sensors 102 on the touch panel 101 are located at positions that can be located at at least one corner of the touch panel 101 and/or The center position of at least one side of the touch panel 101 .

In one embodiment, as shown in FIG. 5 , the plurality of pressure sensors are four pressure sensors 102 , and the projections of the four pressure sensors 102 on the touch panel 101 are located in the touch panel 101 , respectively. 4 corner positions.

In one embodiment, as shown in FIG. 6 , the plurality of pressure sensors are four pressure sensors 102 , and the projections of the four pressure sensors 102 on the touch panel 101 are respectively located on four bars of the touch panel 101 . the center of the edge.

In another embodiment, as shown in FIG. 7 , the plurality of pressure sensors are 6 pressure sensors 102 , and the projections of the 6 pressure sensors 102 on the touch panel 101 are respectively located on the touch panel 101 . The position of the four corners and the center position of the two long sides of the touch panel 101 .

In other embodiments, as shown in FIG. 8 , the plurality of pressure sensors are 8 pressure sensors 102 , and the projections of the 8 pressure sensors 102 on the touch panel 101 are located at four positions of the touch panel 101 respectively. The positions of the corners and the center positions of the four sides of the touch panel 101 .

Optionally, the touch panel 101 can be used for the user to touch and press, and can also be used as an appearance decoration, generally using glass or mylar.

Optionally, the pressure sensor 102 can be a piezoresistive pressure sensor.

Optionally, the elastic support 103 may be a steel sheet or an aluminum sheet.

Continuing to refer to FIG. 3 and FIG. 4 , the touch panel 100 further includes:

The fixing structure 106 is used for suspending and fixing the piezoelectric ceramic component below the touch panel 101 .

Specifically, the piezoelectric ceramic component is fixed on the lower surface of the circuit board 105 by the fixing structure 106 . Optionally, the fixing structure 106 may use glue, double-sided tape, solder, screws and snaps. That is to say, the piezoelectric ceramic component can be fixed on the lower surface of the circuit board 105 by fixing means such as glue, double-sided tape, welding, screws and snaps, wherein the welding can include welding by soldering or laser spot welding.

Optionally, as shown in FIG. 4 , the reinforcing plate 108 needs to avoid space for the piezoelectric ceramic component. That is, the reinforcing plate 108 is provided with a window at the installation position of the piezoelectric ceramic component.

Continuing to refer to FIG. 3 and FIG. 4, in the embodiment of the present application, the piezoelectric ceramic component further includes:

The weight block 107 is fixed on the bottom of the piezoelectric ceramic sheet 104 for increasing the vibration strength of the piezoelectric ceramic sheet 104 .

Specifically, as shown in FIG. 9 , the piezoelectric ceramic driving chip on the circuit board 105 generates alternating voltages, and the piezoelectric ceramic sheet 104 bends into an arcuate shape under the action of the inverse piezoelectric effect, and the two ends of the A force opposite to the bending direction is generated, and the magnitude is equal to the reaction force generated by the deformation. The appropriate weight of the counterweight will increase the force between the metal substrate and the circuit board 105, thereby increasing the vibration intensity of the touch panel 101. According to actual requirements, the configuration block 107 may not be added.

Optionally, the configuration block 107 can be installed at or near the center of gravity of the piezoelectric ceramic sheet 104, and can be fixed with glue or double-sided tape. Generally, a denser copper block, lead block, or steel block can be used.

In the embodiment of the present application, the weight block is fixed at the center of gravity of the piezoelectric ceramic sheet, and the piezoelectric ceramic sheet is uniformly stressed. On the one hand, one end of the piezoelectric ceramic sheet is not subjected to high pressure, resulting in an easy fixing structure. Fall off, on the other hand, the vibration feedback would be better.

In addition, choose a counterweight block with a higher density, which is small in size but has a good counterweight effect.

In one embodiment, the weight block 107 can be a rectangular block with a first groove, and the piezoelectric ceramic sheet 104 is arranged in the first groove.

The thickness of the touch panel can be further reduced by arranging the piezoelectric ceramic sheet in the groove of the weight block.

Optionally, the counterweight 107 may also adopt other shapes, for example, the shape of the counterweight 107 may be set according to the shape of the piezoelectric ceramic sheet 104 . The first groove may also be set in other shapes, such as a trapezoidal groove, which is not limited in this embodiment of the present application.

Optionally, in the embodiment of the present application, selecting a weight block of suitable quality is beneficial to enhance the effect of vibration feedback. Preferably, the length and width of the piezoelectric ceramic sheet 104 are respectively 50 mm and 6 mm, and the mass of the counterweight 107 may be 2.5 g.

The length and width of the piezoelectric ceramic sheet 104 have a certain error, such as ±0.1 mm, that is, the length of the piezoelectric ceramic sheet is between 49 mm and 51 mm, and the width of the piezoelectric ceramic sheet is between 5 mm and 7 mm.

The mass of the counterweight block 107 has a certain error, for example, ±0.1g, that is, the mass range of the counterweight block can be between 2.4g-2.6g.

However, the embodiment of the present application is only described by taking the mass of the weight block 107 as about 2.5 g as an example.

As shown in FIG. 10, a piezoelectric ceramic sheet generally includes a piezoelectric ceramic, a metal substrate, and electrodes. Specifically, it is arranged in order from top to bottom: electrodes, piezoelectric ceramics, metal substrates, piezoelectric ceramics, and electrodes. Among them, the electrodes are flush with the two ends of the piezoelectric ceramic, and the two ends of the metal substrate protrude from the piezoelectric ceramic.

Optionally, the two protruding ends of the metal substrate in the piezoelectric ceramic sheet 104 can be fixed on the lower surface of the circuit board 105 through the fixing structure 106 , so that the piezoelectric ceramic sheet 104 can be suspended on the touch panel 101 below. The installation method can be shown in Figure 11.

Alternatively, a groove can also be provided in the middle area of the upper surface of the piezoelectric ceramic sheet 104 to expose the metal substrate, and the fixing structure 106 is arranged in the groove and fixedly connected to the lower surface of the circuit board 105, So that the piezoelectric ceramic sheet 104 is suspended and installed under the touch panel 101 .

Optionally, the thickness of the fixing structure 106 may be about 0.5 mm, and the gap between the fixing structure 106 and the piezoelectric ceramic is at least greater than or equal to 0.1 mm, and preferably, the gap is between 0.1 mm and 0.2 mm. A certain gap is maintained between the fixed structure and the piezoelectric ceramic, so that the fixed structure will not affect the vibration of the piezoelectric ceramic sheet. In addition, the fixed structure maintains a certain thickness. On the one hand, the piezoelectric ceramic sheet will not contact the touch panel when it vibrates because it is too thin, and on the other hand, it will not increase the thickness of the touch panel because it is too thick.

Optionally, the piezoelectric ceramic sheet can be a single-sided single-layer sheet as shown in FIG. 12 , a single-layer double-sided sheet as shown in FIG. 10 , a multi-layer single-sided sheet as shown in FIG. Long strip piezoelectric ceramic sheets such as the multi-layer multi-faceted sheet shown.

In the embodiment of the present application, the piezoelectric ceramic sheet can be selected by comprehensively considering various factors such as vibration intensity, cost, and driving voltage, which is beneficial to improve the performance of the touch panel.

Optionally, the piezoelectric ceramic sheet can be selected to have a length of 50mm and a width of 6mm. Alternatively, the aspect ratio of the piezoelectric ceramic sheet is 50:6, as long as it can be applied to a touch panel of a suitable size and/or can meet a certain vibration intensity. For example, a piezoelectric ceramic sheet with a length of 50mm and a width of 6mm is suitable for A touch panel with a length of 150mm and a width of 90mm. Alternatively, the vibration feedback can be enhanced by adjusting the driving voltage without changing the size of the piezoelectric ceramic sheet.

Optionally, in the embodiment of the present application, the touch panel 100 may include a piezoelectric ceramic sheet 104 . Optionally, the one piezoelectric ceramic sheet 104 may be arranged at the center of the touch panel 101 .

For example, as shown in FIG. 15 , the installation direction of the piezoelectric ceramic sheet 104 may be parallel to the long side or the short side of the touch panel 101 .

For another example, as shown in FIG. 16 , the installation direction of the piezoelectric ceramic sheet 104 may also be inclined to the long side or the short side of the touch panel 101 .

Optionally, the touch panel 100 of the embodiment of the present application may also include a plurality of piezoelectric ceramic sheets 104, and the plurality of piezoelectric ceramic sheets 104 may vibrate individually or together, thereby increasing the vibration intensity of the touch panel at different positions. consistency.

Optionally, as shown in FIGS. 17-19 , the plurality of piezoelectric ceramic sheets are arranged side by side. The two piezoelectric ceramic sheets 104 in FIG. 17 are arranged side by side parallel to the short side of the touch panel 101 , and the two piezoelectric ceramic sheets 104 in FIG. 18 are arranged side by side parallel to the long side of the touch panel 101 . The four piezoelectric ceramic sheets 104 in FIG. 19 are arranged parallel to the short sides of the touch panel 101 .

Optionally, a part of the plurality of piezoelectric ceramic sheets 104 is arranged parallel to the long side of the touch panel 101 , and another part of the plurality of piezoelectric ceramic sheets 104 is parallel to the long side of the touch panel 101 . The short sides are set side by side. As shown in FIG. 20 , the plurality of piezoelectric ceramic sheets include four piezoelectric ceramic sheets 104 , which are respectively disposed at the edge positions of the four sides of the touch panel 101 .

Optionally, in the embodiments of the present application, the settings of the above-mentioned various sizes are illustrative examples, and are not used to limit the embodiments of the present application.

Optionally, in the embodiment of the present application, the adhesive 131 can be double-sided adhesive; the adhesive 132 can be flexible glue or pad; the adhesive 133 can be instant adhesive, epoxy adhesive or adhesive film; The adhesive 134 can be double-sided tape or glue.

FIG. 21 shows a bottom view of the touch panel provided by the embodiment of the present application, and FIG. 22 shows another bottom view of the touch panel provided by the embodiment of the present application.

FIG. 21 is a bottom view of the touch panel 100 shown in FIG. 3 . Compared with FIG. 21 , in FIG. 22 , the pressure sensor 102 is fixed on the side of the touch panel 101 by the elastic bracket 103 , and the projection of the pressure sensor 102 on the touch panel 101 is located in the area of the touch panel 101 outside.

In one embodiment, as shown in FIG. 22 , the elastic support 103 adopts a U-shaped sheet structure, and the U-shaped sheet structure includes two short axes and one long axis, and the two short axes are fixed on the In the edge area below the touch panel 101, the pressure sensor 102 is arranged on the short axis, and the long axis extends to the side of the touch panel 101 so that the pressure sensor 102 and the touch panel 101 are located at same plane.

Optionally, the elastic support 103 may also adopt a semicircular sheet-like structure.

In conclusion, the embodiment of the present application does not limit the shape of the elastic support 103 .

Further, the pressure sensor 102 is located on the short axis of the elastic support near the intersection of the short axis and the long axis.

In another embodiment, the difference from FIG. 22 is that there is a certain angle between the elastic support 103 and the touch panel 101 . In other words, the projection of the pressure sensor 102 on the touch panel 101 is outside the area of the touch panel 101 but the pressure sensor 102 and the touch panel 101 are not on the same plane.

In the embodiment of the present application, fixing the pressure sensor on the side of the touch panel can make the thickness of the touch panel smaller, for example, the thickness of the touch panel can reach 3 mm.

Optionally, in this embodiment of the present application, the touchpad may include a plurality of elastic supports 103, for example, two elastic supports 103, the two elastic supports 103 are disposed opposite to each other, and each elastic support is provided on Two pressure sensors 102 .

The pressure sensor 102 is attached to the elastic support 103. When the touch panel 101 is under pressure, the elastic support 103 and the pressure sensor 102 deform together, so that the pressure sensor 102 can convert the detected deformation signal into an electrical signal.

FIG. 23 shows a structural exploded view of the touch panel according to the embodiment of the present application. The various devices shown in the figures are the same as those described above, and for the sake of brevity, they will not be repeated here.

FIG. 24 shows an interaction diagram between the internal structures of the touch panel according to the embodiment of the present application. As shown in Figure 24, the capacitance detection array under the touch panel converts the detected capacitance signal into an electrical signal and sends it to the touch detection unit in the control chip, and the pressure sensor under the touch panel converts the detected deformation signal into an electrical signal and sends it to Control the pressure detection unit in the chip, such as a 4-channel piezoresistive detection unit. The control chip can communicate with the main control board in the electronic device through the communication unit. The control chip can also communicate with the piezoelectric ceramic drive chip through the communication unit when the pressure detection unit determines that the pressure signal is greater than the first threshold, and then the piezoelectric ceramic drive chip drives the piezoelectric ceramic sheet to vibrate together with the touch panel.

Optionally, an embodiment of the present application further provides an electronic device, including the touch panel in the various embodiments described above.

It is to be understood that reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic associated with the embodiment is included in at least one embodiment of the present application. Thus, appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

Those of ordinary skill in the art can realize that the units and circuits of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed circuits, branches and units may be implemented in other manners. For example, the branches described above are schematic. For example, the division of the unit is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into A branch, or some feature can be ignored, or not implemented.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution, and the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A touch panel, characterized by comprising:

touch panel;

a pressure sensor, configured to convert the deformation of the pressure sensor into a first electrical signal when the touch panel is under pressure, and the first electrical signal is used for pressure detection;

an elastic support for supporting the pressure sensor, and when the touch panel is under pressure, it drives the pressure sensor to elastically deform together;

A piezoelectric ceramic assembly including a piezoelectric ceramic sheet, the piezoelectric ceramic sheet is used to provide vibration feedback to a user when the first electrical signal is greater than a first threshold, wherein the piezoelectric ceramic assembly is suspended and fixed on the the bottom of the touch panel to be isolated from the elastic support.
The touch panel according to claim 1, wherein the touch panel further comprises:

The fixing structure is used for suspending and fixing the piezoelectric ceramic component under the touch panel.
The touch panel according to claim 2, wherein the piezoelectric ceramic sheet comprises a piezoelectric ceramic, a metal substrate and electrodes, and two ends of the metal substrate protrude from the piezoelectric ceramic and the electrode. Electrodes, both ends of the metal substrate are fixed under the touch panel through the fixing structure.
The touch panel according to claim 3, wherein the distance between the fixing structure and the piezoelectric ceramic is greater than or equal to 0.1 mm.
The touch panel according to any one of claims 2 to 4, wherein the fixing structure comprises glue, double-sided tape, screws, snaps or solder.
The touch panel according to claim 2, wherein the thickness of the fixing structure ranges from 0.4 mm to 0.6 mm.
The touch panel according to any one of claims 1 to 6, wherein the piezoelectric ceramic component further comprises:

The weight block is fixed on the bottom of the piezoelectric ceramic sheet, and is used for increasing the vibration strength of the piezoelectric ceramic sheet.
The touch panel according to claim 7, wherein the weight block is a rectangular block with a first groove, and the piezoelectric ceramic sheet is arranged in the first groove.
The touch panel according to claim 7, wherein the weight block is fixed at the center of gravity of the piezoelectric ceramic sheet.
The touch panel according to claim 7, wherein the configuration block is a copper block, a lead block or a steel block.
The touch panel according to claim 7, wherein the mass of the counterweight is in the range of 2.4g-2.6g.
The touch panel according to any one of claims 1 to 11, wherein the length of the piezoelectric ceramic sheet is between 49 mm and 51 mm, and the width of the piezoelectric ceramic sheet is between 5 mm and 7 mm. .
The touch panel according to any one of claims 1 to 12, wherein the touch panel comprises a piezoelectric ceramic sheet, and the piezoelectric ceramic sheet is arranged at a central position of the touch panel , the installation direction of the one piezoelectric ceramic sheet is parallel to the long side or the short side of the touch panel.
The touch panel according to any one of claims 1 to 12, wherein the touch panel comprises a plurality of piezoelectric ceramic sheets, and the plurality of piezoelectric ceramic sheets are arranged side by side in the same direction, or, A part of the plurality of piezoelectric ceramic sheets is arranged side by side parallel to the long side of the touch panel, and another part of the plurality of piezoelectric ceramic sheets is arranged side by side parallel to the short side of the touch panel.
The touch panel according to any one of claims 1 to 14, wherein the pressure sensor is fixed under the touch panel through the elastic support.
The touch panel according to claim 15, wherein the touch panel comprises 4 pressure sensors, and the projections of the 4 pressure sensors on the touch panel are respectively located in 4 pressure sensors in the touch panel or, the projections of the four pressure sensors on the touch panel are respectively located at the center positions of the four sides in the touch panel.
The touchpad according to any one of claims 1 to 16, wherein the touchpad further comprises:

a control chip, configured to process the first electrical signal, and control the piezoelectric ceramic sheet to provide vibration feedback to the user when the first electrical signal is greater than the first threshold;

a capacitance detection array for converting a capacitance signal obtained by a finger touch into a second electrical signal, where the second electrical signal is used for touch detection;

The control chip is also used for processing the second electrical signal.
An electronic device comprising the touch panel of any one of claims 1 to 17.