WO2019233302A1

WO2019233302A1 - Touch screen, touch pressure detection method and terminal

Info

Publication number: WO2019233302A1
Application number: PCT/CN2019/088508
Authority: WO
Inventors: 王绪军
Original assignee: 维沃移动通信有限公司
Priority date: 2018-06-04
Filing date: 2019-05-27
Publication date: 2019-12-12
Also published as: CN108762573A

Abstract

The present disclosure provides a touch screen, a touch pressure detection method and a terminal. The touch screen comprises: a display module and a pressure sensor; the pressure sensor is provided below the display module, and the display module comprises a light-transmitting cover plate, a touch layer and a display layer which are sequentially provided from top to bottom; the display module further comprises: a ground layer provided between the light-transmitting cover plate and the pressure sensor.

Description

Touch screen, touch pressure detection method and terminal

Cross-reference to related applications

This application claims the priority of Chinese Patent Application No. 201810562572.7 filed in China on June 4, 2018, the entire contents of which are incorporated herein by reference.

Technical field

Embodiments of the present disclosure relate to the field of communications technologies, and in particular, to a touch screen, a touch pressure detection method, and a terminal.

Background technique

Capacitive touch screens implement two-dimensional (2D) touch functions on the X / Y axis, and some manufacturers have also introduced smartphones that add pressure-touch functions in the Z direction to achieve three-dimensional (3D) touch functions.

In a conventional capacitive pressure touch scheme, a pressure sensor (sensor) electrode is pasted under a Liquid Crystal Module (LCM), and a middle frame ground (ground, GND) constitutes a capacitor. The realization principle is the realization principle of the parallel plate capacitor. The principle of parallel plate capacitance is:

C = εS / d

In the formula, C represents the capacitance value, ε represents the dielectric constant, S represents the area of the two metal plates facing the parallel plate capacitor, and d represents the vertical distance between the two metal plates of the parallel plate capacitor.

It can be known from the above relationship that when the distance d between the pressure sensor electrode and the middle frame GND is changed by pressing the screen, the capacitance value C will be changed. Therefore, a touch integrated circuit (IC) can sense a pressure touch event by detecting a change amount of a capacitance value.

This capacitor solution needs to use the middle frame GND as a reference, and has very high requirements for structural reliability. If the mobile phone is dropped, the middle frame is easily deformed, which further changes the distance d between the middle frame and the pressure sensor electrode, which will affect the pressure detection.

To solve the above problems, the capacitive pressure touch scheme has been improved in the related art. The improvement is that an iron frame is added below the pressure sensor as the GND reference plane of the capacitor. As a result, the solution no longer uses the middle frame GND as a reference, the dependency on the structure is relatively reduced, and the reliability is improved. However, this solution must add an additional iron frame, which causes the thickness of the LCM module to increase, and the cost is very high.

Summary of the Invention

The embodiments of the present disclosure provide a touch screen, a touch pressure detection method, and a terminal to solve the problems of poor reliability and high cost of the capacitive pressure touch scheme in the related art.

In a first aspect, an embodiment of the present disclosure provides a touch screen applied to a terminal. The touch screen includes: a display module and a pressure sensor; the pressure sensor is disposed below the display module, and the display module includes The light-transmitting cover, the touch layer, and the display layer are arranged in order from top to bottom;

The display module further includes a ground layer which is disposed between the light-transmissive cover plate and the pressure sensor.

In a second aspect, an embodiment of the present disclosure further provides a touch pressure detection method applied to a terminal, where the terminal includes the touch screen described in the first aspect, and the method includes:

Receiving a pressing input to a light-transmissive cover plate of the touch screen;

In response to the pressing input, acquiring a vertical distance between the formation of the touch screen and a pressure sensor;

Determining a capacitance value of a capacitor composed of the formation and the pressure sensor according to the vertical distance;

The touch pressure is determined according to the capacitance value.

According to a third aspect, an embodiment of the present disclosure further provides a terminal, including: a memory, a processor, and a program stored on the memory and executable on the processor. The program is implemented when the program is executed by the processor. The steps of the touch pressure detection method according to the second aspect.

In a fourth aspect, an embodiment of the present disclosure further provides a terminal, including the touch screen described in the first aspect.

According to a fifth aspect, an embodiment of the present disclosure further provides a computer-readable storage medium. The computer-readable storage medium stores a program, and when the program is executed by a processor, the touch pressure detection according to the second aspect is implemented. Steps in the method.

Thus, in the embodiment of the present disclosure, when the light-transmissive cover plate is pressed, the vertical distance between the ground layer and the pressure sensor provided on the display module can be used to determine the composition of the ground layer and the pressure sensor. The capacitance value of the capacitor is used to determine the touch pressure according to the capacitance value. It can be seen that in the embodiments of the present disclosure, the ground layer in the display module can be used as a reference for determining the touch pressure, without the need to use the middle frame GND as a reference, and it is not necessary to add an additional GND under the pressure sensor. Layer as a reference to determine touch pressure. Therefore, determining touch pressure using the solution of the embodiment of the present disclosure can reduce the dependence on the structure, improve the reliability, and reduce the cost.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions of the embodiments of the present disclosure more clearly, the drawings used in the description of the embodiments of the present disclosure will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative labor.

FIG. 1 is one of the structural schematic diagrams of a touch screen provided by an embodiment of the present disclosure;

2 is a second schematic structural diagram of a touch screen according to an embodiment of the present disclosure;

3 is a third schematic structural diagram of a touch screen according to an embodiment of the present disclosure;

4 is one of the structural diagrams of a pressure sensor provided in an embodiment of the present disclosure;

5 is a flowchart of a touch pressure detection method according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a terminal provided by an embodiment of the present disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

Referring to FIG. 1, FIG. 1 is a schematic structural diagram of a touch screen according to an embodiment of the present disclosure. As shown in FIG. 1, a touch screen 10 according to an embodiment of the present disclosure includes a display module 11 and a pressure sensor 12. The pressure sensor 12 is disposed below the display module 11, and the display module 11 includes a light-transmissive cover 110, a touch layer 111, and a display layer 112 which are disposed in order from top to bottom.

The display module 11 further includes a ground layer (GND) 113, which is disposed between the transparent cover plate 110 and the pressure sensor 12. Thereby, a capacitance is formed between the ground layer and the pressure sensor.

In practical applications, the transparent cover 110 may be a glass cover.

Wherein, the ground layer 113 provided between the light-transmissive cover plate 110 and the pressure sensor 12 includes: the ground layer 113 may be disposed between the light-transmissive cover plate 110 and the touch layer 111, or the ground layer 113 may be disposed on the touch The layer 111 and the display layer 112 or the ground layer 113 may be disposed between the display layer 112 and the pressure sensor 12. In practical applications, in order to further improve reliability, as shown in FIG. 1, the ground layer 113 is disposed between the transparent cover plate 110 and the touch layer 111.

When the light-transmissive cover is pressed, a capacitance value of a capacitor composed of the ground layer and the pressure sensor is determined according to a vertical distance between the ground layer of the touch screen and a pressure sensor, and determined according to the capacitance value Touch pressure.

Specifically, when the transparent cover plate is not pressed, a relatively stable capacitor is formed between the ground layer and the pressure sensor. The calculation formula is as follows:

C = εS / d (1)

In the formula, C represents the capacitance value, ε represents the dielectric constant, S represents the area directly opposite the formation and the pressure sensor, and d represents the vertical distance between the formation and the pressure sensor.

When the light-transmissive cover is pressed, the vertical distance d between the formation and the pressure sensor changes, resulting in a deformation amount Δd. Then, the relative capacitance change caused by the deformation amount is: ΔC = εS / Δd.

At this time, the Analog Front End (AFE) module inside the driver IC detects this capacitance change. The larger the deformation Δd and ΔC, the larger the corresponding perceived pressure will be. Detection.

In practical applications, if the display module includes an anti-static (ASL) layer, the ground layer may be the ASL layer of the display module. If the display module does not include an ASL layer, a ground layer may be coated on the touch layer 111. Because the thickness of the coated ground layer is very thin, there is a gap between the transparent cover and the touch layer, so the thickness of the entire display module is not affected after the ground layer is coated on the touch layer.

In practical applications, as shown in FIG. 1, the pressure sensor 12 may be directly attached to and connected to the display layer 112. Or, in order to better sense the pressing, as shown in FIG. 2, the display module 11 further includes a foam layer 114, which is disposed between the display layer 112 and the pressure sensor 12. The pressure sensor 12 is adhesively connected to the foam layer 114. Specifically, the pressure sensor 12 may be attached below the foam layer 114.

In the embodiment of the present disclosure, the pressure sensor may be derived from a transmit (TX) channel of the touch IC, or may be derived from a separate pressure driving IC channel, and is attached to a lower portion of the display module as a capacitor.

Generally, the terminal may further include a middle frame 20. As shown in FIG. 3, in the embodiment of the present disclosure, the pressure sensor 12 is disposed on a side of the middle frame 20 facing the ground layer 113, and the pressure sensor 12 is connected to the middle frame 20. That is, the side of the pressure sensor 12 facing away from the ground layer 113 is connected to the middle frame 20. According to this design, the area of the pressure sensor is not limited by the structure of the display module, so that a larger area pressure sensor can be attached to the middle frame to improve the accuracy of touch pressure detection.

In the above several implementation manners, the pressure sensor may be obtained after a flexible printed circuit board (Flexible Printed Circuit Board, FPC) is processed through an exposed copper process.

In order to obtain better results and make the distance change Δd between the formation and the pressure sensor easier to sense, the pressure sensor can be made of a material with a special pressure change effect. As shown in FIG. 4, the pressure sensor 12 may be composed of a plurality of layers such as an adhesive layer 121, an elastic medium 122, an electrode layer 123, and an insulation protection layer 124. When the light-transmissive cover is pressed and deformed, the elastic medium acts as a buffer. The deformation of the electrode layer in the pressure sensor relative to the ground layer in the display module is much smaller, which can produce a larger distance change Δd. . The adhesive layer 121 may be a double-sided tape.

The above is only an example of the structure of the pressure sensor, and is not limited to this in practical applications.

In the embodiment of the present disclosure, the ground layer in the display module can be used as a reference for determining the touch pressure, instead of using the middle frame GND as a reference, and it is not necessary to add an additional GND layer under the pressure sensor as a reference for determination Touch pressure. Therefore, determining touch pressure using the solution of the embodiment of the present disclosure can reduce the dependence on the structure, improve the reliability, and reduce the cost.

In the embodiment of the present disclosure, the above touch screen may be applied to a terminal, such as: a mobile phone, a tablet computer, a laptop computer, a personal digital assistant (PDA), and a mobile Internet device (referred to as a PDA). Mobile Internet Device (MID) or Wearable Device (Wearable Device), e-book, electronic watch, etc.

Referring to FIG. 5, FIG. 5 is a flowchart of a touch pressure detection method according to an embodiment of the present disclosure. The method shown in FIG. 5 is applied to a terminal, and the terminal includes the touch screen shown in any one of FIGS. 1 to 4. As shown in FIG. 5, steps 501 to 504 are included.

Step 501: Receive a pressing input to a transparent cover of the touch screen.

Step 502: Obtain a vertical distance between the formation of the touch screen and a pressure sensor in response to the pressing input.

Step 503: Determine a capacitance value of a capacitor composed of the formation and the pressure sensor according to the vertical distance.

Here, the magnitude of the capacitance value can be determined according to the above formula (1).

Step 504: Determine a touch pressure according to the capacitance value.

The implementation process of step 504 may refer to the implementation process of the prior art.

In the embodiment of the present disclosure, the ground layer in the display module can be used as a reference for determining the touch pressure, instead of using the middle frame GND as a reference, and it is not necessary to add an additional GND layer under the pressure sensor as a reference for determination. Touch pressure. Therefore, determining touch pressure using the solution of the embodiment of the present disclosure can reduce the dependence on the structure, improve the reliability, and reduce the cost.

An embodiment of the present disclosure further provides a terminal, including the touch screen described in any one of FIGS. 1-4.

FIG. 6 is a schematic diagram of a hardware structure of a terminal that implements various embodiments of the present disclosure. The terminal 600 includes, but is not limited to, a radio frequency unit 601, a network module 602, an audio output unit 603, an input unit 604, a sensor 605, a display unit 606, a user input unit 607, an interface unit 608, a memory 609, a processor 610, and a power supply. 611 and other components. Those skilled in the art can understand that the terminal structure shown in FIG. 6 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange different components. In the embodiment of the present disclosure, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a car terminal, a wearable device, and a pedometer.

The user input unit 607 may be used to receive inputted numeric or character information, and generate key signal inputs related to user settings and function control of the terminal. Specifically, the user input unit 607 includes a touch panel 6071 and other input devices 6072. Touch panel 6071, also known as touch screen, can collect the user's touch operations on or near it (such as the user using a finger, stylus and other suitable objects or accessories on or near touch panel 6071 operating). The touch panel 6071 may include a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch position, and detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts it into contact coordinates, and sends To the processor 610, receive the command sent by the processor 610 and execute it. In addition, various types such as resistive, capacitive, infrared, and surface acoustic wave can be used to implement the touch panel 6071. In addition to the touch panel 6071, the user input unit 607 may further include other input devices 6072. Specifically, other input devices 6072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, and details are not described herein again.

Further, the touch panel 6071 may be overlaid on the display panel 6061. When the touch panel 6071 detects a touch operation on or near the touch panel 6071, the touch panel 6071 transmits the touch operation to the processor 610 to determine the type of the touch event. The type of event provides corresponding visual output on the display panel 6061. Although in FIG. 6, the touch panel 6071 and the display panel 6061 are implemented as two independent components to implement the input and output functions of the terminal, in some embodiments, the touch panel 6071 and the display panel 6061 can be integrated and Implement the input and output functions of the terminal, which are not limited here.

In the embodiment of the present disclosure, the touch screen includes: a display module and a pressure sensor; the pressure sensor is disposed below the display module, and the display module includes a light-transmissive cover plate arranged in order from top to bottom A touch layer and a display layer; the display module further includes: a ground layer, the ground layer is disposed between the light-transmissive cover plate and the pressure sensor.

The processor 610 is configured to control the user input unit 607 to receive a pressing input on the light-transmissive cover plate of the touch screen; in response to the pressing input, obtain a vertical distance between a stratum of the touch screen and a pressure sensor; The vertical distance determines a capacitance value of a capacitor composed of the ground layer and the pressure sensor; and determines a touch pressure according to the capacitance value.

It should be understood that, in the embodiment of the present disclosure, the radio frequency unit 601 may be used to receive and send signals during the transmission and reception of information or during a call. Specifically, the downlink data from the base station is received and processed by the processor 610; The uplink data is sent to the base station. Generally, the radio frequency unit 601 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 601 can also communicate with a network and other devices through a wireless communication system.

The terminal provides users with wireless broadband Internet access through the network module 602, such as helping users to send and receive email, browse web pages, and access streaming media.

The audio output unit 603 may convert audio data received by the radio frequency unit 601 or the network module 602 or stored in the memory 609 into audio signals and output them as sound. Moreover, the audio output unit 603 may also provide audio output (for example, call signal reception sound, message reception sound, etc.) related to a specific function performed by the terminal 600. The audio output unit 603 includes a speaker, a buzzer, a receiver, and the like.

The input unit 604 is used for receiving audio or video signals. The input unit 604 may include a graphics processing unit (GPU) 6041 and a microphone 6042. The graphics processor 6041 pairs images of still pictures or videos obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. Data is processed. The processed image frames may be displayed on a display unit 606. The image frames processed by the graphics processor 6041 may be stored in the memory 609 (or other storage medium) or transmitted via the radio frequency unit 601 or the network module 602. The microphone 6042 can receive sound, and can process such sound into audio data. The processed audio data can be converted into a format that can be transmitted to a mobile communication base station via the radio frequency unit 601 in the case of a telephone call mode.

The terminal 600 further includes at least one sensor 605, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor. The ambient light sensor can adjust the brightness of the display panel 6061 according to the brightness of the ambient light. The proximity sensor can close the display panel 6061 and / when the terminal 600 is moved to the ear. Or backlight. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (usually three axes), and can detect the magnitude and direction of gravity when it is stationary, and can be used to identify the attitude of the terminal (such as horizontal and vertical screen switching, related games, Magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tap), etc .; sensor 605 can also include fingerprint sensor, pressure sensor, iris sensor, molecular sensor, gyroscope, barometer, hygrometer, thermometer, infrared The sensors and the like are not repeated here.

The display unit 606 is configured to display information input by the user or information provided to the user. The display unit 606 may include a display panel 6061, and the display panel 6061 may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

The interface unit 608 is an interface through which an external device is connected to the terminal 600. For example, the external device may include a wired or wireless headset port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, audio input / output (I / O) port, video I / O port, headphone port, and more. The interface unit 608 may be used to receive an input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal 600 or may be used between the terminal 600 and an external device. Transfer data.

The memory 609 can be used to store software programs and various data. The memory 609 may mainly include a storage program area and a storage data area, where the storage program area may store an operating system, at least one application required by a function (such as a sound playback function, an image playback function, etc.), etc .; the storage data area may store data according to Data (such as audio data, phone book, etc.) created by the use of mobile phones. In addition, the memory 609 may include a high-speed random access memory, and may further include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

The processor 610 is a control center of the terminal, and uses various interfaces and lines to connect various parts of the entire terminal. By running or executing software programs and / or modules stored in the memory 609, and calling data stored in the memory 609, execution is performed. Various functions and processing data of the terminal, so as to monitor the terminal as a whole. The processor 610 may include one or more processing units; optionally, the processor 610 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and an application program, etc. The tuning processor mainly handles wireless communication. It can be understood that the foregoing modem processor may not be integrated into the processor 610.

The terminal 600 may further include a power source 611 (such as a battery) for supplying power to various components. Optionally, the power source 611 may be logically connected to the processor 610 through a power management system, so as to manage charging, discharging, and power consumption management through the power management system. And other functions.

In addition, the terminal 600 includes some functional modules that are not shown, and details are not described herein again.

Optionally, an embodiment of the present disclosure further provides a terminal, including a processor, a memory, and a computer program stored on the memory and executable on the processor. The computer program implements the touch pressure when the computer program is executed by the processor. Each process of the detection method embodiment can achieve the same technical effect. To avoid repetition, details are not repeated here.

An embodiment of the present disclosure further provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the processes of the foregoing touch pressure detection method embodiments are implemented, and can achieve the same Technical effects, in order to avoid repetition, will not repeat them here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this article, the terms "including", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, It also includes other elements not explicitly listed, or elements inherent to such a process, method, article, or device. Without more restrictions, an element limited by the sentence "including a ..." does not exclude that there are other identical elements in the process, method, article, or device that includes the element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods in the above embodiments can be implemented by means of software plus a necessary universal hardware platform, or by hardware, but in many cases the former is better. Implementation. Based on this understanding, the technical solution of the present disclosure that is essentially or contributes to the existing technology can be embodied in the form of a software product that is stored in a storage medium (such as ROM / RAM, magnetic disk, The optical disc) includes several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in the embodiments of the present disclosure.

The embodiments of the present disclosure have been described above with reference to the accompanying drawings, but the present disclosure is not limited to the specific implementations described above, and the specific implementations described above are only schematic and not restrictive. Those of ordinary skill in the art at Under the inspiration of this disclosure, many forms can be made without departing from the scope of the present disclosure and the scope of protection of the claims, all of which fall into the protection of this disclosure.

Claims

A touch screen applied to a terminal includes: a display module and a pressure sensor; the pressure sensor is disposed below the display module, and the display module includes a light-transmissive cover plate arranged in order from top to bottom; Layer

The display module further includes a ground layer which is disposed between the light-transmissive cover plate and the pressure sensor.
The touch screen according to claim 1, wherein the ground layer is an antistatic layer.
The touch screen according to claim 1, wherein the ground layer is disposed between the light-transmissive cover plate and the touch layer.
The touch screen according to claim 1, wherein the display module further comprises: a foam layer disposed between the display layer and the pressure sensor;

The pressure sensor is adhesively connected to the foam layer.
The touch screen according to claim 1, wherein the terminal comprises a middle frame;

The pressure sensor is disposed on a side of the middle frame that faces the formation, and the pressure sensor is connected to the middle frame.
The touch screen according to claim 1, wherein the pressure sensor is obtained after a flexible printed circuit board is subjected to a copper exposure process.
The touch screen according to claim 1, wherein the pressure sensor comprises an adhesive layer, an elastic medium layer, an electrode layer, and an insulation protection layer, which are sequentially arranged from top to bottom.
A touch pressure detection method applied to a terminal, wherein the terminal includes the touch screen according to any one of claims 1 to 7; the method includes:

Receiving a pressing input to a light-transmissive cover plate of the touch screen;

In response to the pressing input, obtaining a vertical distance between the formation of the touch screen and a pressure sensor;

Determining a capacitance value of a capacitance composed of the formation and the pressure sensor according to the vertical distance;

The touch pressure is determined according to the capacitance value.
A terminal includes: a memory, a processor, and a program stored on the memory and executable on the processor, and when the program is executed by the processor, the touch pressure according to claim 8 is implemented Steps of the detection method.
A terminal comprising the touch screen according to any one of claims 1-7.
A computer-readable storage medium stores a program on the computer-readable storage medium, and when the program is executed by a processor, the steps in the touch pressure detection method according to claim 8 are implemented.