WO2017214857A1

WO2017214857A1 - Portable electronic equipment and pressure measuring device and method for same

Info

Publication number: WO2017214857A1
Application number: PCT/CN2016/085720
Authority: WO
Inventors: 桂新涛; 陈小祥; 钟翔
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2016-06-14
Filing date: 2016-06-14
Publication date: 2017-12-21
Also published as: CN107735657A

Abstract

A pressure measuring method for portable electronic equipment, comprising the following steps: detecting a deformation signal generated by pressure corresponding to a touch operation (S10); converting the deformation signal into an electrical signal (S20); capturing the electrical signal and quantizing to obtain pressure measurement information (S30); and acquiring a pressure calculation parameter by means of curve fitting, and calculating a pressure value corresponding to the touch operation on the basis of the pressure calculation parameter and the pressure measurement information (S40). The pressure measuring method can precisely measure the touch pressure and fully satisfy user needs. Further provided are a pressure measuring device for portable electronic equipment and a portable equipment.

Description

Portable electronic device and pressure detecting device and method thereof

Technical field

The present invention relates to the field of touch technologies, and in particular, to a pressure detecting method for a portable electronic device, a pressure detecting device for a portable electronic device, and a portable electronic device.

Background technique

Portable electronic devices have brought convenience to people's daily life and work, and have become an indispensable tool for people. There are various input devices for portable electronic devices, such as buttons, mice, joysticks, laser pens, touch screens, etc., among which touch screens are rapidly applied to various electronic devices due to their good interactivity.

With the continuous development of technology, users have higher and higher requirements for the operation experience of portable electronic devices such as mobile phones and tablets, and expect a more convenient human-computer interaction experience, so that pressure detection technology emerges as the times require, and portable electronic devices are used for people. Bring a new operating experience.

However, the technology of built-in pressure detecting devices in portable electronic devices is still in the stage of exploration and development. Some pressure detecting solutions on the market require multiple pressure sensors to be placed on the edges of electronic devices such as mobile phones and tablets. This solution is not only costly but also costly. Will increase the thickness of the electronic device.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the above-mentioned techniques to some extent. To this end, a first object of the present invention is to provide a pressure detecting method for a portable electronic device capable of accurately detecting touch force information.

A second object of the present invention is to propose a pressure detecting device for a portable electronic device. A third object of the present invention is to provide a portable electronic device.

In order to achieve the above object, a pressure detecting method for a portable electronic device according to a first aspect of the present invention includes the following steps: detecting a deformation signal generated by a pressure corresponding to a touch action; converting the deformation signal into An electrical signal; capturing and quantizing the electrical signal to obtain pressure detection information; acquiring a pressure calculation parameter by using a curve fitting method, and calculating the touch action according to the pressure calculation parameter and the pressure detection information The value of the pressure.

According to an embodiment of the present invention, the deformation signal is converted into an electrical signal by a sensing electrode, wherein the sensing electrode is disposed in a capacitive array, and the touch area of the portable electronic device is divided into multiple according to the position of the sensing electrode. Area, each area is defined as a logical channel, and each logical channel corresponds to a set of pressure calculation parameters. The division of the plurality of regions may be uniform or non-uniform.

According to an embodiment of the present invention, the pressure detecting method further includes: acquiring a touch corresponding to the touch action Controlling coordinate information of the position; acquiring a corresponding logical channel according to the coordinate information, and acquiring a pressure calculation parameter corresponding to the logical channel.

According to an embodiment of the present invention, the corresponding N logical channels are further obtained according to the coordinate information, and the pressure calculation parameters corresponding to each of the N logical channels are acquired, and the calculation parameters are respectively calculated according to the N sets of pressure calculation parameters. The N pressure values corresponding to the N logical channels are used to calculate the pressure value corresponding to the touch action by using spatial interpolation according to the N pressure values and the center position coordinates of the N logical channels, wherein , N is an integer greater than one.

Specifically, the pressure value corresponding to the touch action may be calculated according to the following formula:

Wherein, Rawdata is the pressure detection information, F is a pressure value corresponding to the touch action, and a, b, c, and d are the pressure calculation parameters.

According to an embodiment of the present invention, calculating the pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information, comprising: calculating a parameter according to the pressure and the pressure detection information by a preset velocity interval Establishing a pressure detection information-pressure value table; calculating a pressure value corresponding to the touch action according to the pressure detection information and the pressure detection information-pressure value table by using a piecewise approximate linear manner.

According to an embodiment of the present invention, the pressure calculation parameter is obtained by using a curve fitting method, including: pressing m different pressure values F _i respectively, and respectively recording corresponding pressure detection information r _i , wherein i=1 , 2, ..., m; according to the acquired m group data (F _i , r _i ), the pressure calculation parameters a, b, c and d are fitted by least squares method.

In summary, according to the pressure detecting method for the portable electronic device according to the embodiment of the present invention, based on the acquired pressure detection information, the pressure calculation parameter can be obtained by curve fitting, and the coordinate information of the touch position is used, and the virtual logic is adopted. The algorithm of channel and space interpolation realizes accurate detection of touch pressure, and can accurately detect the same pressure value when different touch positions are used with the same touch force, and improve the consistency of pressure output of different touch positions, fully satisfying User needs.

In order to achieve the above object, a pressure detecting device for a portable electronic device according to a second aspect of the present invention includes: a sensing electrode, wherein the sensing electrode is configured to detect a deformation signal generated by a pressure corresponding to a touch action, And converting the deformation signal into an electrical signal; the detecting circuit, configured to capture and quantize the electrical signal to obtain pressure detection information; and the computing system, the computing system adopts a curve fitting manner to obtain Calculating a parameter of the pressure, and calculating a pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information.

According to an embodiment of the invention, the sensing electrodes are arranged in a capacitive array, and the sensing electrodes The touch area of the portable electronic device is divided into a plurality of logical channels, and each of the logical channels corresponds to a set of pressure calculation parameters.

According to an embodiment of the present invention, the computing system is further configured to acquire coordinate information of a touch position corresponding to the touch action, and acquire a corresponding logical channel according to the coordinate information, and acquire a corresponding logical channel. Pressure calculation parameters.

According to an embodiment of the present invention, the computing system is further configured to acquire corresponding N logical channels according to the coordinate information, and acquire pressure calculation parameters corresponding to each of the N logical channels, and according to N The group pressure calculation parameters respectively calculate N pressure values corresponding to the N logical channels, and calculate the touch action by using spatial interpolation according to the N pressure values and the center position coordinates of the N logical channels. Corresponding pressure values, where N is an integer greater than one.

Specifically, according to an embodiment of the present invention, the computing system may calculate a pressure value corresponding to the touch action according to the following formula:

According to an embodiment of the present invention, the calculation system further includes a pressure detection information-pressure value table, and the calculation system is further configured to pass the pressure detection information and the pressure detection information-pressure value table according to the pressure detection information The pressure value corresponding to the touch action is calculated by using a piecewise approximate linearity.

According to an embodiment of the present invention, the computing system employs curve fitting way to obtain pressure corresponding to said calculated parameters, the value of F _i for further pressing pressure according to m different detection information acquired r _i m group Data (F _i , r _i ), and according to the m sets of data (F _i , r _i ), the pressure calculation parameters a, b, c and d are fitted by least squares method, wherein i=1 , 2, ..., m.

According to the pressure detecting device for a portable electronic device according to an embodiment of the present invention, based on the pressure detecting information acquired by the detecting circuit, the calculating system can obtain the pressure calculating parameter by using a curve fitting method, and adopting the coordinate information of the touch position to adopt the virtual The logic channel and spatial interpolation algorithm can accurately detect the touch pressure, and can accurately detect the same pressure value when different touch positions are used, and improve the consistency of pressure output at different touch positions. Meet the needs of users.

Further, an embodiment of the present invention also proposes a portable electronic device including the above-described pressure detecting device.

The portable electronic device of the embodiment of the invention can accurately detect the touch pressure and make different touches When the position adopts the same touch force, the same pressure value can be accurately detected, the consistency of the pressure output of different touch positions is improved, the user's needs are fully satisfied, and the user experience is improved.

DRAWINGS

1 is a block schematic diagram of a pressure detecting device for a portable electronic device in accordance with an embodiment of the present invention;

2a is a schematic view showing the layout of a sensing electrode according to an embodiment of the present invention;

2b is a schematic diagram showing the layout of a sensing electrode according to another embodiment of the present invention;

2c is a schematic view showing the layout of a sensing electrode according to still another embodiment of the present invention;

3a is a schematic structural view of a sensing electrode according to an embodiment of the invention;

FIG. 3b is a schematic structural diagram of a sensing electrode according to another embodiment of the present invention; FIG.

3c is a schematic structural view of a sensing electrode according to still another embodiment of the present invention;

4a is a block schematic diagram of a detection circuit in accordance with one embodiment of the present invention;

4b is a block schematic diagram of a detection circuit in accordance with another embodiment of the present invention;

4c is a block schematic diagram of a detection circuit in accordance with yet another embodiment of the present invention;

FIG. 5 is a schematic diagram showing changes in capacitance when a corresponding region of a sensing electrode is pressed according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a Rawdata-F curve after curve parameter fitting according to an embodiment of the present invention;

FIG. 7a is a schematic diagram of a shape variable when a center position is pressed according to an embodiment of the present invention; FIG.

Figure 7b is a schematic illustration of a shape variable when pressed near the right edge, in accordance with one embodiment of the present invention;

Figure 7c is a schematic illustration of a shape variable when pressed near a left edge, in accordance with one embodiment of the present invention;

FIG. 8 is a schematic diagram of dividing nine touch screens into 32 logical channels by using nine sensing electrodes according to an embodiment of the invention; FIG.

9 is a schematic diagram of a Rawdata-F curve corresponding to a type variable pressed at different positions according to an embodiment of the present invention;

FIG. 10a is a schematic diagram of dividing three touch screens into 32 logical channels by using three sensing electrodes according to another embodiment of the present invention; FIG.

FIG. 10b is a schematic diagram of a Rawdata data curve corresponding to a plurality of points pressed by the same force in a horizontal direction in a horizontal position according to an embodiment of the present invention; FIG.

11 is a flow chart of a pressure detection method for a portable electronic device in accordance with an embodiment of the present invention.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

First of all, it should be noted that the pressure detection technology is different from the touch detection technology. In the pressure detection, it is not only necessary to detect the presence or absence of pressure, but also to detect the magnitude of the pressure, that is, to achieve accurate pressure measurement. Moreover, in order to ensure the consistency of the user's operating experience, when the same strength is pressed at different positions, the calculated strength is required to be the same. However, in practical applications, the shape variables generated when the same force acts on different positions may be different, which results in inconsistent detected shape variables, resulting in different final detected forces.

To this end, the related art proposes a way to change the size of the sensing electrode, that is, the size of the sensing electrodes placed at different positions is different to solve the above problem. However, due to the nonlinearity of the relationship between capacitance and distance, changing the size of the sensing electrode does not completely solve the above problem, and the method also limits the flexibility of the sensing electrode layout.

Based on the recognition and research of the above problems, the pressure detecting method for portable electronic device, the pressure detecting device for portable electronic device and the portable electronic device proposed by the present invention can realize accurate detection of pressure without special design induction The electrodes are sized and the pressure output at different touch locations remains consistent.

Hereinafter, a pressure detecting method for a portable electronic device, a pressure detecting device for a portable electronic device, and a portable electronic device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, a pressure detecting device for a portable electronic device according to an embodiment of the present invention includes a sensing electrode 10, a detecting circuit 20, and a computing system 30.

Wherein, when the pressure acts on the input medium (for example, the touch screen of the portable electronic device), the input medium generates a deformation signal, and the sensing electrode 10 is configured to detect the deformation signal generated by the pressure corresponding to the touch action, and convert the deformation signal into electric signal. The detection circuit 20 is configured to capture and quantize the electrical signal to obtain pressure detection information. The calculation system 30 obtains the pressure calculation parameter by curve fitting, and calculates the pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information. That is, the sensing electrode 10 converts the deformation signal into a certain form of electrical signal, and the detecting circuit 20 captures and quantizes the electrical signal, and then sends the quantized signal to the computing system 30 for processing, thereby extracting the required pressure information. Accurately calculate the magnitude of the pressure.

According to an embodiment of the invention, the sensing electrodes 10 can be arranged in a capacitive array, as can be seen in particular in Figures 2a to 2c. The sensing electrode 10 adopts a capacitive array, and can be used for pressure detection by using a touch chip existing in a portable electronic device, or integrated into a touch system, thereby eliminating the need for an additional control chip and greatly reducing the cost.

Moreover, the capacitive array can be used to embed the sensing electrodes in the liquid crystal display module, so that no increase in thickness is caused in the structure.

3a, 3b, and 3c are three different configurations of sensing electrodes. Specifically, as shown in FIG. 3a, the sensing electrode 10 is attached to the LCD (Liquid Crystal Display), and there is a certain gap between the sensing electrode 10 and the middle frame supporting the LCD module. A good compression foam filling, wherein the middle frame supporting the LCD module can be a middle frame of a mobile phone middle frame or other kinds of electronic devices. Such work after the system is powered, the LCD module layers Vcom ITO, and the block to the system, the sensing electrode 10 and the LCD module Vcom ITO layer is present the capacitor C _1, the block 10 and the sensing electrode capacitance exists C _2, C ₁ is connected in parallel with C ₂ . When the Cover cover is pressed, the Cover cover is deformed and the distance between the sensing electrode 10 and the middle frame is reduced, and the capacitance C _{2 is} increased. At this time, the change of C ₁ is substantially negligible, so that the change of C ₂ can be detected. The current pressing force can be determined.

The structure shown in FIG. 3b is similar to that of FIG. 3a. In this structure, the sensing electrode 10 can be attached to the middle frame of the mobile phone supporting the LCD module, and the sensing electrode 10 and the LCD module have a certain gap. Such work after the system is powered, the ITO layer LCD module (Vcom is) and the ITO layer to block the system, the sensing electrode 10 and the LCD module (Vcom is) the presence of the capacitor C _1, the presence of the capacitive sensing electrode 10 and the frame C ₂ , C ₁ and C ₂ are connected in parallel. When the Cover cover is pressed, the Cover cover is deformed and the distance between the ITO layer (Vcom) of the LCD module and the sensing electrode 10 is reduced, and the capacitance C _{1 is} increased, and the change of C ₂ is basically negligible, thereby passing change detection of C ₁ to determine the current pressing strength.

The structure shown in FIG. 3c is applied to the embodiment in which the LCD module has a metal back frame. The structure is similar to the structure shown in FIG. 3b, except that the sensing electrode 10 is attached to the metal back frame of the LCD module. I will not go into details.

It should be noted that, as shown in FIG. 3a to FIG. 3c, only the structural position of the sensing electrode is indicated, and the number of sensing electrodes and the specific layout are not limited. In the embodiment of the present invention, the number of sensing electrodes and the specific layout may be as shown in FIG. 2a to FIG. 2b. Of course, it is understood that the present invention is not limited thereto.

In the embodiment of the present invention, the detecting circuit 20 can also have various implementation forms, as shown in FIG. 4a to FIG. 4b. 4a and 4b are self-capacity detecting circuits, and FIG. 4c is a mutual capacitance detecting circuit. Of course, the actual application is not limited to these three detection circuits.

Specifically, as shown in FIG. 4a, the detecting circuit adopts an RC voltage dividing structure, wherein Tx is a driving signal, and may be various forms of signals such as a sine wave and a square wave. The driving signal Tx is coupled to the capacitor Ctp to be detected via the resistor R0, and the signal on the capacitor Ctp to be detected is amplified by the amplifier circuit, and the signal amplified by the amplifier circuit is sent to the filter circuit for filtering processing, and the output signal of the filter circuit is sent to the solution. The tuning circuit performs demodulation to obtain a specific form of raw data (Rawdata), that is, a certain characteristic of the original signal, that is, pressure detection information. The Rawdata is sent to the computing system 30, and the computing system 30 can calculate the current pressure magnitude information based on the change in the current pressure detection information Rawdata.

The detection circuit shown in FIG. 4b uses a charge transfer method for capacitance detection, wherein Tx is a drive signal, which can be various forms of signals such as a sine wave and a square wave. When the control switch φ _{1 is} closed and the control switch φ ₂ is turned off, the capacitor Ctp to be charged is charged, and at the same time, the capacitor Ca is discharged; when the control switch φ ₁ is turned off and the control switch φ ₂ is closed, the capacitor to be detected Ctp is used. The capacitor Ca is divided and charged, and the Cb is integrated and charged; the output signal of the integrating circuit is sent to the filter circuit for filtering, and the output signal of the filter circuit is sent to the demodulation circuit for demodulation to obtain a specific form of raw data (Rawdata). That is, a certain characteristic of the original signal, that is, pressure detection information; Rawdata is sent to the computing system 30, and the computing system 30 can calculate the current pressure size information based on the change of the current pressure detection information Rawdata.

In the detection circuit shown in FIG. 4c, Tx is a drive signal, and may be various forms of signals such as a sine wave or a square wave. The driving signal Tx is coupled to the integral amplification circuit of the back end via the capacitor Ctp to be detected, and the output signal of the integrating amplifier circuit is sent to the filter circuit for filtering processing, and the output signal of the filter circuit is sent to the demodulation circuit for demodulation to obtain the original data of a specific form. Rawdata is a specific feature of the original signal, that is, pressure detection information; Rawdata is sent to the computing system 30, so that the computing system 30 can calculate the current pressure size information based on the change of the current pressure detection information Rawdata.

Further, the pressure calculation process of the pressure detecting device of the embodiment of the present invention is described by taking the above-described sensing electrode shown in FIG. 3a and the detecting circuit shown in FIG. 4a as an example.

Wherein, the capacitance to be detected C _tp =C ₁ +C ₂ , during the pressing process, C ₁ remains substantially unchanged, C ₂ increases with increasing pressure, and the local region C ₂ in the pressing can be equivalent to a parallel plate capacitor, specifically 5, before the pressing, C ₂ = C _20, after the pressing,

Drive signal Tx is

The amplification circuit gain is G, and the demodulation circuit adopts amplitude demodulation. Then the output Rawdata is expressed by the following formula:

Where Δd is a shape variable generated by a certain pressure F, F and Δd approximately satisfy Hooke's law, that is, F=kΔd, and the elastic stiffness coefficient k corresponding to different touch positions is different, so formula (1) can be expressed as:

Where a = AG, b = wR ₀ C ₁ , c = wR ₀ C ₂₀ kd ₀ , d = kd ₀ , the formula (2) can be simplified as:

Therefore, in an embodiment of the present invention, the computing system 30 can calculate the pressure value corresponding to the touch action according to the above formula (3), wherein Rawdata is the pressure detection information, and F is the pressure corresponding to the touch action. Values, a, b, c, and d are the pressure calculation parameters.

However, it is difficult to obtain the values of the amplification circuit gain G, the capacitances C ₁ , C ₂₀ , the initial pitch d _{0 ,} and the elastic stiffness coefficient k in advance accurately. Therefore, in the embodiment of the present invention, the calculation system 30 can obtain the pressure calculation parameters a, b, c, and d by means of curve fitting, so that the pressure calculation can be performed by using the above formula (3), and the calculation can be achieved. Calculate the accuracy.

In an embodiment of the present invention, when the calculation system 30 acquires the pressure calculation parameter by means of curve fitting, it is also used to acquire m group data according to the corresponding pressure detection information r _i when pressing the m different pressure values F _i ( F _i , r _i ), and according to the m group data (F _i , r _i ), the pressure calculation parameters a, b, c and d are fitted by least squares method, wherein i=1, 2,... , m.

That is to say, when the calculation system 30 obtains the pressure calculation parameters a, b, c, and d in advance by means of curve fitting, it is pressed with m different velocities F _{i in} advance, and the corresponding pressure detection information is respectively recorded. _i , where i=1, 2, . . . , m, then obtain m sets of data (F _i , r _i ), and finally adopt a least squares method to fit the pressure calculation parameters a, b, c and d, and The pressure calculation parameters a, b, c, and d are saved, so that the calculation system 30 substitutes Rawdata acquired in real time into the above formula (3), and F can be calculated.

In a specific example of the present invention, sample data of 0g, 100g, 200g, 300g, 400g, 500g, 600g may be collected in advance, and the pressure calculation parameters a, b, c, d are fitted with these sample data and Rawdata is drawn. -F curve, as shown in Figure 6. It can be seen from Fig. 6 that the sample data can basically fall on the fitting curve well, so the pressure detection information Rawdata at the corresponding arbitrary pressing force F outputted by the detecting circuit can be calculated into the above formula (3) to calculate the accuracy. Pressure size information.

It should be noted that, when obtaining the sample data, the F _i is not limited to 0g, 100g, 200g, 300g, 400g, 500g, 600g, and may be any force within the range, and the sample data number m is greater than 4. .

Among them, since the square (square) and square root operations are involved in the above formula (3), for a normal MCU, the amount of calculation is relatively Larger, therefore, in one embodiment of the present invention, a pressure detection information-pressure value table, that is, a table of F-Rawdata, may be pre-set in the computing system 30, such that the computing system 30 is also used to detect information Rawdata according to pressure. The pressure detection information-pressure value table calculates the pressure value corresponding to the touch action by adopting a piecewise approximate linear manner.

Specifically, a table about F-Rawdata can be established at a certain velocity interval step (such as 50g) according to the above formula (3), for example, as shown in Table 1 below, this table is stored in advance in the system flash memory/memory. If the calculation system 30 obtains Rawdata as y when a certain velocity is pressed in real time, and y _i >y≥y _i+1 , the pressure value can be calculated in a piecewise approximate linear manner, that is,

Table 1

However, in practical applications, the shape variables generated when the same force acts on different positions may be different, which results in inconsistent detected shape variables, resulting in different final detected forces, as shown in Figures 7a to 7c. Shown.

7a to 7c are schematic diagrams of the shape variables when the same force is pressed at different positions in the X direction. For convenience of description, the sensing electrodes are placed at the bottom. The X direction referred to herein refers to the horizontal direction (lateral direction) of the touch screen, and the vertical direction is the Y direction (longitudinal direction). 7a is a schematic diagram of a shape variable when the center position is pressed, FIG. 7b is a schematic diagram of a shape variable when pressed near the right edge, and FIG. 7c is a schematic diagram of a shape variable when pressed near the left edge. As shown in connection with Figs. 7a to 7c, the shape variable pressed near the left and right edges is smaller than the shape variable pressed at the center position, that is, Δd in Fig. 7a is different from Δd in Fig. 7b or 7c. If the pressure information is only measured according to the shape variable, when the same force is pressed at different positions, the pressure calculated at different positions of the system will have a large deviation.

Similarly, the shape variables when pressed at the same position in different positions in the Y direction will also be different.

Therefore, the pressure detecting device of the embodiment of the present invention can calculate the pressure value corresponding to the touch action by using the virtual logic channel and the spatial interpolation method in combination with the coordinate information of the touch position, thereby improving the consistency of the pressure output at different positions.

According to an embodiment of the invention, the touch area of the portable electronic device is divided into a plurality of areas in combination with the position of the sensing electrode, and each area is defined as a logical channel, and each logical channel corresponds to a set of pressure calculation parameters. The division of the multiple regions may be a uniform division or a non-uniform division.

Specifically, as shown in FIG. 8, the pressure detecting device includes nine independent sensing electrodes S0 to S8, which can fully touch The screen is divided into 32 areas according to the position, and each area corresponds to one logical channel, that is, there are 32 logical channels C0-C31. It should be noted that the 32 logical channels C0-C31 are virtual, and in fact, there is not necessarily a physical sensing electrode. For example, the logical channel C14 selects the data of the sensing electrode S4, and the logical channel C12 selects the data of the sensing electrode S3. Referring to FIG. 9 together, there is a significant difference between the two Rawdata-F curves corresponding to the logical channels C12 and C14, which reflects the difference in the shape variables generated when the two places are pressed. Therefore, in order to obtain consistent pressure output at different positions, it is necessary to separately obtain the pressure calculation parameters corresponding to each logical channel in advance, and select the corresponding logical channel according to the position coordinate information for real-time pressure calculation in actual operation.

In an embodiment of the present invention, the computing system 30 is further configured to acquire coordinate information of the touch position corresponding to the touch action, and obtain a corresponding logical channel according to the coordinate information, and acquire a corresponding logical channel. Pressure calculation parameters to facilitate the accuracy of subsequent pressure calculations.

Specifically, first, determine a mapping relationship between the logical channel C _i and the sensing electrode S _i , that is, which sensing electrode data is used by the logical channel C _i for pressure calculation, and then acquire each logical channel C _i according to the foregoing curve fitting manner. The pressure calculation parameters a _i , b _i , c _i , d _i , a total of 32 groups, are stored in the flash memory. Next, when the sample data (F _i , r _i ) is acquired, the center position of the logical channel is pressed, as in the circle position in FIG. Finally, the position coordinate information reported by the system is used to calculate which logical channel area the current pressing center position falls, and the pressure calculation parameter of the logical channel is read from the flash memory. At the same time, according to the mapping relationship between the logical channel and the sensing electrode, the data of the sensing electrode corresponding to the logical channel is selected and substituted with the pressure calculation parameter into the above formula (3) for pressure calculation, and an accurate pressure calculation value can be obtained.

Wherein, when the mapping table between the logical channel and the sensing electrode is established, the mapping method can be various. For example, one method can be selected based on location, with each logical channel picking the nearest sensing electrode. Another method can be selected based on the size of the shape variable. Each logical channel selects the sensing electrode with the largest shape variable when pressed at its position; in addition, a logical channel can be considered to select data of multiple sensing electrodes. This is not limited herein.

Of course, in the above embodiment, the full screen of the touch is divided into 32 logical channels. In actual applications, any number of logical channels can be divided according to requirements, and the division manner is not limited.

In an embodiment of the present invention, in order to further improve the pressure calculation accuracy of the position outside the center position of the logical channel, the calculation system 30 is further configured to acquire the corresponding N logical channels according to the coordinate information, and acquire the N logical channels. Calculating a pressure calculation parameter corresponding to each of the logical channels, and calculating N pressure values corresponding to the N logical channels according to the N sets of pressure calculation parameters, respectively, according to the N pressure values and the center of the N logical channels The position coordinates calculate the pressure value corresponding to the touch action by using spatial interpolation, where N is an integer greater than 1.

Specifically, taking three sensing electrodes as an example, as shown in FIG. 10a, the pressure detecting device for a portable electronic device in one embodiment includes three sensing electrodes S0 to S2, and corresponding three sensing electrodes S0 to S2. The 32 logical channels C0 to C31 are pressed at 13 different points with the same velocity on the horizontal line of the position where the logical channel C12 is located, and the Rawdata data outputted by the sensing electrode S1 is as shown in FIG. 10b.

If the actual pressing center position is P0 in FIG. 10a, it can be seen from FIG. 10b that the Rawdata output by S1 when pressed at P0 is smaller than the Rawdata output by S1 when pressed at the logical channel C12, and is larger than the S1 output when pressed by the logical channel C13. Rawdata. If the pressure calculation parameters corresponding to the logic channel C12 or C13 are directly used for calculation, the calculated pressure value will be too large or too small.

Similarly, the same phenomenon exists in the vertical direction. If the calculation of the pressure calculation parameters corresponding to the logic channel C5 or C9 is directly performed at P1 in Fig. 10a, the calculated pressure value will also be too large or partial. small.

Therefore, in order to reduce the deviation caused by the calculation pressure of the single logic channel, in one embodiment of the present invention, the pressure calculation can be performed by using multiple logic channels at the same time. The following takes the example of P2 in FIG. 10a as an example.

First, select the pressure calculation parameters corresponding to the four logical channels C4, C5, C8, and C9 at the distance P2 for pressure calculation. The calculated pressure values are respectively recorded as F ₁ , F ₂ , F ₃ , and F ₄ , assuming P2 The coordinates are (x, y), and the coordinates of the center positions of the logical channels C4, C5, C8, and C9 are (x ₁ , y ₁ ), (x ₂ , y ₂ ), (x ₃ , y ₃ ), (x). ₄ , y ₄ ), using bilinear interpolation method to calculate the pressure at P2, the specific method is as follows:

Interpolation in the X direction:

F _x1 = α _x F ₁ + (1 - α _x ) F ₂ , F _x2 = α _x F ₃ + (1 - α _x ) F ₄ ,

Interpolation in the Y direction:

F _y =α _y F _x1 +(1-α _y )F _x2 ,

The method of spatial interpolation is not limited to the above method, and can be reasonably selected according to specific conditions. For example, you can also select the multiple logical channels near P2 to calculate the pressure at P2 by surface fitting. You can select C0, C1, C2, C4, C5, C6, C8, C9, C10 in Figure 10a. The logic channel uses the quadratic surface fitting estimate to calculate the pressure at P2.

Therefore, by selecting the pressure calculation parameters corresponding to the plurality of logic channels and using the spatial interpolation method to calculate the pressure value corresponding to the touch action, the accuracy of the pressure calculation can be further improved.

According to the pressure detecting device for a portable electronic device according to an embodiment of the present invention, based on the pressure detecting information acquired by the detecting circuit, the calculating system can obtain the pressure calculating parameter by using a curve fitting method, and adopting the coordinate information of the touch position to adopt the virtual The logic channel and spatial interpolation algorithm can accurately detect the touch pressure, and can accurately detect the same pressure value when different touch positions are used with the same touch force, and improve the pressure output of different touch positions. To meet the needs of users.

11 is a flow chart of a pressure detection method for a portable electronic device in accordance with an embodiment of the present invention. As shown in FIG. 11, the pressure detecting method for a portable electronic device includes the following steps:

S10. Detect a deformation signal generated by a pressure corresponding to the touch action.

Wherein, when the pressure corresponding to the touch action acts on the input medium (for example, the touch screen of the portable electronic device), the input medium will generate a deformation signal.

S20, converting the deformation signal into an electrical signal.

Wherein, in an embodiment of the invention, the deformation signal is converted into an electrical signal by a sensing electrode. Moreover, the structural arrangement of the sensing electrodes can be as shown in Figures 3a to 3b.

S30, capturing and quantizing the electrical signal to obtain pressure detection information.

S40, the pressure calculation parameter is obtained by curve fitting, and the pressure value corresponding to the touch action is calculated according to the pressure calculation parameter and the pressure detection information.

That is to say, the sensing electrode converts the deformation signal into a certain form of electrical signal, and the electrical signal is captured and quantized by the detecting circuit, and then the quantized signal is sent to the computing system for processing, thereby extracting the required pressure information and accurately calculating Get the size of the pressure.

In an embodiment of the invention, the sensing electrodes may be arranged in a capacitive array, and reference may be made to 2a to 2c. The capacitive electrode array can be used for pressure detection by using the existing touch chip in the portable electronic device, or integrated into the touch system, thereby eliminating the need for additional control chips and greatly reducing the cost.

Therefore, the pressure detecting method of the embodiment of the present invention can calculate the pressure value corresponding to the touch action by using the virtual logic channel and the spatial interpolation method in combination with the coordinate information of the touch position, thereby improving the consistency of the pressure output at different positions.

According to an embodiment of the invention, the touch area of the portable electronic device is divided into a plurality of areas in combination with the position of the sensing electrode, and each area is defined as a logical channel, and each logical channel corresponds to a set of pressure calculation parameters. The division of the multiple regions may be a uniform division or a non-uniform division. Specifically, as shown in FIG. 8, nine independent sensing electrodes S0-S8 can divide the touch full screen into 32 regions according to the position, and each region corresponds to one logical channel, that is, a total of 32 logical channels C0-C31 .

And, as shown in FIG. 8 and FIG. 9, the logical channel C14 selects the data of the sensing electrode S4, and the logical channel C12 selects the data of the sensing electrode S3, so that there is a significant difference between the two Rawdata-F curves corresponding to the logical channels C12 and C14, which reflects the difference in the shape variables generated when the two places are pressed. Therefore, in order to obtain consistent pressure output at different positions, it is necessary to separately obtain the pressure calculation parameters corresponding to each logical channel in advance, and select the corresponding logical channel according to the position coordinate information for real-time pressure calculation in actual operation.

Therefore, according to an embodiment of the present invention, the pressure detecting method further includes: acquiring coordinate information of the touch position corresponding to the touch action; acquiring a corresponding logical channel according to the coordinate information, and acquiring the logical channel Corresponding pressure calculation parameters. Then, the pressure of the touch position is calculated according to the obtained pressure calculation parameter corresponding to the logical channel.

Further, in order to reduce the deviation caused by the calculation pressure of a single logical channel, in one embodiment of the present invention, the pressure calculation can be performed simultaneously using a plurality of logical channels. That is, in the pressure detecting method of the embodiment of the present invention, the corresponding N logical channels are also acquired according to the coordinate information, and the pressure calculation parameters corresponding to each of the N logical channels are acquired, and the parameters are calculated according to the N sets of pressures. Calculating N pressure values corresponding to the N logical channels, respectively, to calculate a pressure value corresponding to the touch action by using spatial interpolation according to the N pressure values and the center position coordinates of the N logical channels Where N is an integer greater than one.

Specifically, the description of P2 in FIG. 10a is taken as an example. First, select the pressure calculation parameters corresponding to the four logical channels C4, C5, C8, and C9 at the distance P2 for pressure calculation. The calculated pressure values are respectively recorded as F ₁ , F ₂ , F ₃ , and F ₄ , assuming P2 The coordinates are (x, y), and the coordinates of the center positions of the logical channels C4, C5, C8, and C9 are (x ₁ , y ₁ ), (x ₂ , y ₂ ), (x ₃ , y ₃ ), (x). ₄ , y ₄ ), using bilinear interpolation method to calculate the pressure at P2, the specific method is as follows:

Interpolation in the X direction:

Interpolation in the Y direction:

F _y =α _y F _x1 +(1-α _y )F _x2 ,

It can be seen that by selecting the pressure calculation parameters corresponding to the plurality of logic channels and using the spatial interpolation method to calculate the pressure value corresponding to the touch action, the accuracy of the pressure calculation can be further improved.

In an embodiment of the present invention, the pressure value corresponding to the touch action may be calculated according to the following formula:

Wherein, Rawdata is the pressure detection information, and F is a pressure value corresponding to the touch action, a, b, c, and d is the pressure calculation parameter.

And, according to another embodiment of the present invention, in step S40, calculating a pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information, comprising: calculating a parameter and the pressure according to the pressure The detection information establishes the pressure detection information-pressure value table at a preset velocity interval, as shown in the above Table 1; calculating the touch according to the pressure detection information and the pressure detection information-pressure value table in a piecewise approximate linear manner The pressure value corresponding to the control action.

Wherein the curve fitting way to obtain pressure calculation parameters, comprising: using respectively different pressure values m F _i is pressed, and are denoted by the corresponding pressure detecting information r _i, where, i = 1,2, ..., m Based on the acquired m sets of data (F _i , r _i ), the pressure calculation parameters a, b, c, and d are fitted by least squares.

Further, an embodiment of the present invention also proposes a portable electronic device including the above-described pressure detecting device. The portable electronic device may be a mobile terminal such as a mobile phone, a tablet, or the like.

The portable electronic device of the embodiment of the invention can accurately detect the touch pressure, and can accurately detect the same pressure value when different touch positions are used with the same touch force, thereby improving the uniform pressure output of different touch positions. Sex, fully meet the needs of users and improve the user experience.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. Or in one; can be The mechanical connection may also be an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship of two elements unless explicitly defined otherwise. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A pressure detecting method for a portable electronic device, comprising the steps of:

Detecting a deformation signal generated by a pressure corresponding to the touch action;

Converting the deformation signal into an electrical signal;

Capturing and quantizing the electrical signal to obtain pressure detection information;

The pressure calculation parameter is obtained by curve fitting, and the pressure value corresponding to the touch action is calculated according to the pressure calculation parameter and the pressure detection information.
The pressure detecting method according to claim 1, wherein the deformation signal is converted into an electrical signal by an induction electrode, wherein the sensing electrode is disposed in a capacitive array, and according to the position of the sensing electrode The touch area of the portable electronic device is divided into a plurality of areas, each of the areas is defined as a logical channel, and each of the logical channels corresponds to a set of pressure calculation parameters.
The pressure detecting method according to claim 2, further comprising:

Obtaining coordinate information of the touch position corresponding to the touch action;

Obtaining a corresponding logical channel according to the coordinate information, and acquiring a pressure calculation parameter corresponding to the logical channel.
The pressure detecting method according to claim 3, further comprising: acquiring corresponding N logical channels according to the coordinate information, and acquiring pressure calculation parameters corresponding to each of the N logical channels, and according to The N sets of pressure calculation parameters respectively calculate N pressure values corresponding to the N logical channels, and calculate the touch by using spatial interpolation according to the N pressure values and the center position coordinates of the N logical channels. The pressure value corresponding to the action, where N is an integer greater than one.
The pressure detecting method according to any one of claims 1 to 4, wherein the pressure value corresponding to the touch action is calculated according to the following formula:

Wherein, Rawdata is the pressure detection information, F is a pressure value corresponding to the touch action, and a, b, c, and d are the pressure calculation parameters.
The pressure detecting method according to any one of claims 1 to 4, wherein calculating the pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information comprises:

Establishing a pressure detection information-pressure value table according to the pressure calculation parameter and the pressure detection information at a preset velocity interval;

Calculating according to the pressure detection information and the pressure detection information-pressure value table by using a piecewise approximate linear method The pressure value corresponding to the touch action.
The pressure detecting method according to claim 1, wherein the pressure calculation parameter is obtained by a curve fitting method, including:

Pressing m different pressure values F i respectively, and respectively recording the corresponding pressure detection information r i , where i=1, 2, . . . , m;

Based on the acquired m sets of data (F i , r i ), the pressure calculation parameters a, b, c, and d are fitted by least squares.
A pressure detecting device for a portable electronic device, comprising:

a sensing electrode, configured to detect a deformation signal generated by a pressure corresponding to the touch action, and convert the deformation signal into an electrical signal;

a detection circuit, configured to capture and quantize the electrical signal to obtain pressure detection information;

a calculation system, wherein the calculation system acquires a pressure calculation parameter by using a curve fitting method, and calculates a pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information.
The pressure detecting device according to claim 8, wherein the sensing electrodes are disposed in a capacitive array, and the touch area of the portable electronic device is divided into a plurality of regions according to the position of the sensing electrodes, The regions are defined as one logical channel, and each of the logical channels corresponds to a set of pressure calculation parameters.
The pressure detecting device according to claim 9, wherein the computing system is further configured to acquire coordinate information of the touch position corresponding to the touch action, and acquire a corresponding logical channel according to the coordinate information, And obtaining a pressure calculation parameter corresponding to the logical channel.
The pressure detecting device according to claim 10, wherein the computing system is further configured to acquire corresponding N logical channels according to the coordinate information, and acquire corresponding to each of the N logical channels a pressure calculation parameter, and calculating N pressure values corresponding to the N logical channels according to the N sets of pressure calculation parameters, respectively, by using spatial interpolation according to the N pressure values and the center position coordinates of the N logical channels The method calculates a pressure value corresponding to the touch action, where N is an integer greater than 1.
The pressure detecting device according to any one of claims 8 to 11, wherein the calculation system calculates a pressure value corresponding to the touch action according to the following formula:

Wherein, Rawdata is the pressure detection information, F is a pressure value corresponding to the touch action, and a, b, c, and d are the pressure calculation parameters.
The pressure detecting device according to any one of claims 8-11, wherein the calculation system is further provided with a pressure detection information-pressure value table, and the calculation system is further configured to detect according to the pressure The information and the pressure detection information-pressure value table calculate the pressure value corresponding to the touch action by adopting a piecewise approximate linear manner.
The pressure detecting device according to claim 8, wherein when the calculating system acquires the pressure calculating parameter by means of curve fitting, it is further used for pressing corresponding pressure according to m different pressure values F i acquiring detection information r i m sets of data (F i, r i), and m sets of data in accordance with the (F i, r i), the pressure fitting calculation parameters a, b, c by least square method and d, where i = 1, 2, ..., m.
A portable electronic device comprising the pressure detecting device according to any one of claims 8-14.