WO2015154570A1

WO2015154570A1 - Touchscreen sensing method and device

Info

Publication number: WO2015154570A1
Application number: PCT/CN2015/071489
Authority: WO
Inventors: 武青锋; 张宇
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-09-04
Filing date: 2015-01-23
Publication date: 2015-10-15
Also published as: CN105468213A

Abstract

A touchscreen sensing method and device, which relate to the field of computer devices. The method comprises: detecting a touched position of a touchscreen; and according to the change of the capacitor's capacity of the touched position, judging the touched force in the touched position.

Description

Touch screen sensing method and device

Technical field

The present invention relates to the field of computer equipment, and in particular, to a touch screen sensing method and apparatus.

Background technique

The traditional touch screen is an input device, which allows the user to touch the icon or text on the display screen with only a finger, thereby realizing the operation of the host, thus eliminating the keyboard and mouse operation and making the person Machine interaction is more straightforward. It is rugged, fast-responding, space-saving, and easy to communicate.

With the application of touch screens on handheld devices such as mobile phones, especially the wide application of capacitive screens, the user experience of terminal devices has been greatly enhanced, and the application of touch screens has become more and more popular. Our daily life. However, all the touch screens on the market today are a kind of lateral sensing, which can only sense the position of the touch, and the sensing mode is single, which also limits the operation mode and affects the user experience of some applications.

Summary of the invention

The embodiment of the invention provides a touch screen sensing method and device, which solves the problem that the touch screen sensing mode is single and thus affects the user experience.

A touch screen sensing method includes:

Detecting the touched position of the touch screen;

A velocity touched at the touched position is determined according to a change in capacitance value of the touched position.

Optionally, the touch screen comprises two layers of non-contact capacitive plates, the capacitive plates comprising a plurality of capacitors, the contact area of each capacitor being fixed.

Optionally, detecting the touched position of the touch screen includes:

Detecting the change in capacitance of each capacitor;

The timing is started immediately when the capacitance value of the capacitor changes, and the timing stops when the capacitance value of any capacitor does not change, and the timing result is the change time;

Determining a position of the plurality of capacitors whose capacitance changes are the touched positions, and a sum of contact areas of the plurality of capacitors together constitute an area of the touched position;

The capacitance value of the touched position is measured as the changed capacitance value when the timing is stopped.

Optionally, determining, according to the capacitance value change of the touched position, determining the strength touched on the touched location includes:

Calculating a difference between a capacitance value original value of the touched position and the changed capacitance value as a capacitance capacity change amount;

Calculating the compressed distance of the capacitive plate of the touched position according to the following expression:

Where ΔC is the capacitance capacity change amount, ε is a dielectric constant, S is an area of the touched position, and d is a compression distance of the capacitor plate;

Calculating a rate of change of the touched position by dividing a compression distance of the capacitor plate by the change time;

Based on the rate of change, the magnitude of the force applied to the touched position is determined.

Optionally, the original value of the capacitance value is the capacitance value before the capacitance is deformed.

Optionally, the method further includes:

When increasing the resolution of the touch screen, the amount of capacitance on the capacitor plate is increased.

Optionally, after the step of determining the strength of being touched on the touched position according to the change in the capacitance value of the touched position, the method further includes:

Data indicating the touched touch on the touched location is transmitted to the associated application.

The embodiment of the invention further provides a touch screen sensing device, comprising:

a capacitance change detecting module configured to detect a touched position of the touch screen;

The velocity determination module is configured to determine that the capacitance value is changed according to the touched position The touched touch on the touched position.

Optionally, the touch screen includes two non-contact capacitive plates, the capacitor plate includes a plurality of capacitors, and a contact area of each capacitor is fixed. The capacitance change detection module includes:

a change detecting unit configured to detect a change in capacitance of each capacitor;

The timing unit is set to start timing immediately when the capacitance value of the capacitor changes, and the timing stops when the capacitance value of any capacitor does not change, and the timing result is the change time;

An area calculation unit configured to determine a position of the plurality of capacitors whose capacitance changes are touched positions, and a sum of contact areas of the plurality of capacitors together constitute an area of the touched position;

The capacitance measuring unit is configured to measure a capacitance value of the touched position as a changed capacitance value when the timing is stopped.

Optionally, the velocity determination module includes:

a capacitance change calculation unit configured to calculate a difference between a capacitance value original value of the touched position and the changed capacitance value as a capacitance value change amount;

The deformation calculation unit is configured to calculate a compression distance of the capacitive plate of the touched position according to the following formula:

a rate calculation unit configured to calculate a rate of change of the touched position by dividing a compression distance of the capacitor plate by the change time;

The velocity quantization unit is configured to determine the magnitude of the force applied to the touched position according to the rate of change.

An embodiment of the present invention further provides a terminal, including a touch screen and a processor, where

The touch screen includes two non-contact capacitive plates, the capacitor plate includes a plurality of capacitors, and a contact area of each capacitor is fixed;

The processor is configured to detect a touched position of the touch screen, and determine a touched force at the touched position according to a change in capacitance capacity of the touched position.

Optionally,

The processor is configured to: detect a change in capacitance of each capacitor;

Embodiments of the present invention also provide a computer readable storage medium storing program instructions that, when executed, cause a terminal to execute the method.

On the basis of detecting the touch of the horizontal touch screen, the embodiment of the invention adds a new sensing dimension, and realizes a richer touch screen sensing control mode, which solves the problem that the existing touch screen sensing mode is single and affects the user experience.

BRIEF abstract

1 is a schematic structural diagram of a touch screen sensing system according to Embodiment 1 of the present invention;

2 is a flowchart of a touch screen sensing method according to Embodiment 2 of the present invention;

Figure 3 is a specific flow chart of step 201 in Figure 2;

Figure 4 is a specific flow chart of step 202 in Figure 2;

FIG. 5 is a schematic structural diagram of a touch screen sensing device according to Embodiment 3 of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a capacitance change detecting module 501 of FIG. 5;

FIG. 7 is a schematic structural diagram of the velocity determination module 502 of FIG. 5;

FIG. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention.

Preferred embodiment of the invention

All touch screens on the market today are a kind of lateral sensor, which can only sense the touch position. The single sensing mode also limits the way it operates, affecting the user experience of some applications. However, the strength of the touch is not well presented, so that the vertical sensing is not reflected, which greatly reduces the user experience of some applications.

In order to solve the above problems, embodiments of the present invention provide a touch screen sensing method and apparatus, which will greatly enhance the application of the touch screen, and have a more stereoscopic effect for some existing applications.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

First, the first embodiment of the present invention will be described with reference to the accompanying drawings.

The embodiment of the invention provides a touch screen capable of detecting the touch force. The touch screen uses a specific principle to detect the magnitude of the touch force, and the data processing module of the terminal further converts the detected power into data required by the mobile phone application. Optionally, the touch screen comprises two capacitor plates of the same area stacked on top of each other. The capacitor plate needs to be divided into a plurality of tiny capacitors, and the number of capacitors is proportional to the number of resolutions of the screen, that is, on the screen. As the rate increases, the number of capacitors on the capacitor plate also increases.

The method for detecting touch force in the embodiment of the present invention is to detect by using a change in capacitance value. This method makes full use of the characteristics of the capacitor itself, which is composed of an insulating medium between two metal plates and a metal plate. The formula for calculating the capacitance value is as follows:

among them:

ε is a dielectric constant;

The area of the S capacitor plate that is touched;

d is the distance between the two capacitor plates.

From the above formula, we can see that when the dielectric constant ε and the area S of the touched position of the capacitor plate are constant, the capacitance values C and d of the capacitor are inversely proportional.

The method of detecting force mentioned in the embodiment of the present invention is to calculate the force by using the relationship between the capacitance value C and the distance d between the plates. The method is that when the force is applied to the touch screen, the capacitive plate of the touch screen in the touched position will move correspondingly, that is, the compression deformation, so that the distance d between the capacitor plates changes, and the dielectric constant ε When the area S of the capacitor plate (the area of the touched position, including the contact area of all the small capacitors in contact) is constant, the capacitance value change amount 'C can be calculated, during the change of the capacitance value. The change time t can be recorded (the starting point of the record is the time of touching the capacitive screen, and the ending time is the time when the capacitor stops changing), so that

It is possible to calculate the rate at which the capacitance value changes. According to the relationship between the capacitance value C and the distance d between the capacitor plates, the rate of change of the distance between the capacitor plates can be calculated.

The rate of change can be converted to the magnitude of the force after quantization.

The embodiment of the invention further provides a touch screen sensing system, as shown in FIG. 1 , comprising the following modules:

Capacitor plate 101, measurement module 102, calculation module 103, data processing module 104.

Among them, the capacitor plate 101: provides a special capacitor plate that can change position due to force.

Measurement module 102: The module is configured to detect a change in the capacitance value after the change in the position of the capacitive surface.

The calculation module 103: the module is set to perform post-processing of data, and the data obtained from the measurement module is processed later, and the magnitude of the force is calculated.

Data Processing Module 104: This module is arranged to quantify the measured forces to meet the needs of different use cases.

The touch screen and the touch screen sensing system provided by the embodiments of the present invention can be applied to all products using the touch screen, which can greatly enhance the user experience of the terminal product, and give the user a more three-dimensional feeling, such as a need for application in the mobile phone product. Detect the amount of force on the game program.

The following uses a mobile phone as an example to describe the process of measuring touch force using the above touch screen and touch screen sensing system:

1) When the mobile phone user touches the touch screen with a finger, the capacitive plate of the touch screen can generate a slight deformation due to the force of the finger, and such a small deformation can be detected by the special touch screen, and this The changes are transmitted to the measurement module.

2) The measurement module accurately calculates the change of the capacitance value of the touch screen capacitor according to the data obtained in 1) (The capacitive screen will have a raw value before leaving the factory, that is, the capacitance value before the deformation occurs, the difference between the changed capacitance value and the original value, that is, the capacitance value change amount), and the measured capacitance The amount of change in capacitance is passed to the calculation module for calculation processing.

3) According to the change of the capacitance value calculated by the measurement module, the calculation module can accurately calculate the magnitude of the force, and pass the calculated force to the data processing module for processing.

4) The data processing module quantizes the data of the force calculated by the calculation module, and quantizes it into data that can be recognized by various applications (the identified data also refers to some data required by the mobile phone or the game application software, and the specific format needs to be based on The requirements of the application software are processed, and the raw data obtained is the data of the change of force).

5) After the application obtains the data provided by the data processing module, it will make a specific response according to the data, and the change brought by the touch force will be presented to the user, which can improve the user's feeling ability.

Embodiment 2 of the present invention will be described below with reference to the accompanying drawings.

Embodiments of the present invention provide a touch screen sensing method. The touch screen includes two layers of non-contact capacitive plates, and the capacitor plates include a plurality of capacitors, and a contact area of each capacitor is fixed. The process of using the method to complete the touch detection of the touch screen is as shown in FIG. 2, including:

Step 201: Detecting a touched position of the touch screen;

This step is specifically shown in Figure 3, including:

Step 2011, detecting a capacitance change of the capacitor;

In step 2012, the timing is started immediately when the capacitance value of the capacitor changes, and the timing stops when the capacitance value of any capacitor does not change, and the timing result is the change time;

Step 2013: determining that the location of the plurality of capacitors whose capacitance changes are the touched locations, and the sum of the contact areas of the plurality of capacitors together constitute an area of the touched location;

In step 2014, the capacitance value of the touched position is measured as the changed capacitance value when the timing is stopped.

Step 202: Determine, according to the capacitance value change of the touched position, the touched position The strength of being touched;

This step is specifically shown in Figure 4, including:

Step 2021: Calculate a difference between a capacitance value original value of the touched position and the changed capacitance value as a capacitance capacity change amount;

In the embodiment of the present invention, the original value of the capacitance value is the capacitance value before the capacitance is not deformed.

Step 2022: Calculate a compressed distance of the capacitive plate of the touched position according to the following expression:

Step 2023, calculating a rate of change of the touched position by dividing a compression distance of the capacitor plate by the change time;

Step 2024: Determine, according to the rate of change, a magnitude of a force applied by the touched position.

Optionally, the touch screen according to the embodiment of the present invention has a resolution proportional to the number of capacitors in the capacitor plate. That is, when the resolution of the touch screen is increased, the amount of capacitance on the capacitor plate is increased.

After determining the data of the touched velocity, data indicating the touched touch on the touched location may also be converted to a format recognizable by the application for transmission to the relevant application.

Embodiment 3 of the present invention will be described below with reference to the accompanying drawings.

The embodiment of the invention provides a touch screen sensing device, which combines a touch screen to complete the function of sensing touch force. The structure of the device is shown in Figure 5, including:

The capacitance change detecting module 501 is configured to detect a touched position of the touch screen;

The velocity determination module 502 is configured to determine a velocity touched at the touched location according to a change in capacitance capacity of the touched location.

Optionally, the touch screen comprises two layers of non-contact capacitive plates, the capacitive plates comprising a plurality of Capacitors with a fixed contact area for each capacitor.

The structure of the capacitance change detecting module 501 is as shown in FIG. 6, and includes:

a change detecting unit 5011 configured to detect a capacitance change of each capacitor;

The timing unit 5012 is configured to start the timing immediately when the capacitance of the capacitor changes, and the timing stops when the capacitance of any capacitor does not change, and the timing result is the change time;

The area calculating unit 5013 is configured to determine that the positions of the plurality of capacitors whose capacitance changes are the touched positions, and the sum of the contact areas of the plurality of capacitors together constitute an area of the touched position;

The capacitance measuring unit 5014 is configured to measure a capacitance value of the touched position as a changed capacitance value when the timing is stopped.

Optionally, the structure of the velocity determination module 502 is as shown in FIG. 7, and includes:

The capacitance change calculation unit 5021 is configured to calculate a difference between the capacitance value original value of the touched position and the changed capacitance value as a capacitance value change amount;

The deformation calculation unit 5022 is configured to calculate a compression distance of the capacitive plate of the touched position according to the following formula:

The rate calculating unit 5023 is configured to calculate a rate of change of the touched position by dividing the capacitive plate by a compressed distance by the change time;

The velocity quantization unit 5024 is configured to determine the magnitude of the force applied to the touched position based on the rate of change.

As shown in FIG. 8, an embodiment of the present invention further provides a terminal, including a touch screen 80 and a processor 81, where

The touch screen 80 includes two non-contact capacitive plates, the capacitor plate includes a plurality of capacitors, and a contact area of each capacitor is fixed;

The processor 81 is configured to detect a touched position of the touch screen, and determine a touched force at the touched position according to a change in capacitance capacity of the touched position.

The processor 81 is configured to: detect a change in capacitance of each capacitor;

Embodiments of the present invention provide a touch screen sensing method and apparatus for detecting a touched position of a touch screen, and determining a touched force at the touched position according to a change in capacitance value of the touched position. On the basis of detecting the touch of the horizontal touch screen, a new sensing dimension is added, which realizes a richer touch screen sensing control method, and solves the problem that the existing touch screen sensing mode is single and affects the user experience.

One of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described embodiments can be implemented using a computer program flow, which can be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, the invention is not limited to any specific combination of hardware and software.

The devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Industrial applicability

Claims

A touch screen sensing method includes:

Detecting the touched position of the touch screen;

A velocity touched at the touched position is determined according to a change in capacitance value of the touched position.
The touch screen sensing method according to claim 1, wherein the touch screen comprises two non-contact capacitive plates, the capacitive plates comprising a plurality of capacitors, each of which has a fixed contact area.
The touch screen sensing method according to claim 2, wherein detecting the touched position of the touch screen comprises:

Detecting the change in capacitance of each capacitor;

The timing is started immediately when the capacitance value of the capacitor changes, and the timing stops when the capacitance value of any capacitor does not change, and the timing result is the change time;

Determining a position of the plurality of capacitors whose capacitance changes are the touched positions, and a sum of contact areas of the plurality of capacitors together constitute an area of the touched position;

The capacitance value of the touched position is measured as the changed capacitance value when the timing is stopped.
The touch screen sensing method according to claim 3, wherein determining the strength touched on the touched position according to the capacitance value change of the touched position comprises:

Calculating a difference between a capacitance value original value of the touched position and the changed capacitance value as a capacitance capacity change amount;

Calculating the compressed distance of the capacitive plate of the touched position according to the following expression:

Where ΔC is the capacitance capacity change amount, ε is a dielectric constant, S is an area of the touched position, and d is a compression distance of the capacitor plate;

Calculating a rate of change of the touched position by dividing a compression distance of the capacitor plate by the change time;

Based on the rate of change, the magnitude of the force applied to the touched position is determined.
The touch screen sensing method according to claim 4, wherein the original value of the capacitance value is a capacitance value before the capacitance is not deformed.
The touch screen sensing method according to claim 3, further comprising:

When increasing the resolution of the touch screen, the amount of capacitance on the capacitor plate is increased.
The touch screen sensing method according to claim 1, wherein after the step of determining the intensity of being touched on the touched position according to the change in the capacitance value of the touched position, the method further comprises:

Data indicating the touched touch on the touched location is transmitted to the associated application.
A touch screen sensing device includes:

a capacitance change detecting module configured to detect a touched position of the touch screen;

The velocity determination module is configured to determine a velocity touched at the touched position according to a change in capacitance capacity of the touched position.
The touch screen sensing device according to claim 8, wherein the touch screen comprises two layers of non-contact capacitive plates, the capacitor plates comprise a plurality of capacitors, and a contact area of each capacitor is fixed, the capacitance change detecting module include:

a change detecting unit configured to detect a change in capacitance of each capacitor;

The timing unit is set to start timing immediately when the capacitance value of the capacitor changes, and the timing stops when the capacitance value of any capacitor does not change, and the timing result is the change time;

An area calculation unit configured to determine a position of the plurality of capacitors whose capacitance changes are touched positions, and a sum of contact areas of the plurality of capacitors together constitute an area of the touched position;

The capacitance measuring unit is configured to measure a capacitance value of the touched position as a changed capacitance value when the timing is stopped.
The touch screen sensing device of claim 9, wherein the velocity determination module comprises:

a capacitance change calculation unit configured to calculate a raw value of the capacitance value of the touched position The difference between the capacitance values of the changes is taken as the capacitance capacitance change amount;

Calculating the compressed distance of the capacitive plate of the touched position according to the following expression:

Where ΔC is the capacitance capacity change amount, ε is a dielectric constant, S is an area of the touched position, and d is a compression distance of the capacitor plate;

Calculating a rate of change of the touched position by dividing a compression distance of the capacitor plate by the change time;

Based on the rate of change, the magnitude of the force applied to the touched position is determined.
A terminal includes a touch screen and a processor, wherein

The touch screen includes two non-contact capacitive plates, the capacitor plate includes a plurality of capacitors, and a contact area of each capacitor is fixed;

The processor is configured to detect a touched position of the touch screen, and determine a touched force at the touched position according to a change in capacitance capacity of the touched position.
The terminal of claim 11 wherein

The processor is configured to: detect a change in capacitance of each capacitor;

The timing is started immediately when the capacitance value of the capacitor changes, and the timing stops when the capacitance value of any capacitor does not change, and the timing result is the change time;

Determining a position of the plurality of capacitors whose capacitance changes are the touched positions, and a sum of contact areas of the plurality of capacitors together constitute an area of the touched position;

The capacitance value of the touched position is measured as the changed capacitance value when the timing is stopped.
A computer readable storage medium storing program instructions that, when executed, can implement the method of any of claims 1-3.