CN101916153B - Method, device and terminal for positioning touch point of touch screen - Google Patents

Abstract

The invention provides a method, a device and a terminal for positioning a touch point of a touch screen, which relate to the field of touch screens and aim to solve the technical problem of higher requirement of a touch device on the ambient environment in the prior art. The method for positioning a touch point of a touch screen comprises the following steps of: 1. obtaining the time a sound wave signal derived from the touch point arrives at three different detecting points of the touch screen; and 2. obtaining the position of the touch point according to the arrival time and the positions of the detecting points. The invention has high adaptability to environment.

Description

Localization method, device and the terminal of the touch point of touch-screen

Technical field

The present invention relates to touch-screen field, refer to especially a kind of localization method, device and terminal of touch point of touch-screen.

Background technology

Along with growing with each passing day of interaction of multimedia information, people utilize touch-screen more and more.Touch-screen has the space of saving, is easy to the advantages such as interchange, is extremely attractive brand-new multimedia interactive device.Touch-screen is boundless in global range of application, the inquiry of for example public information, corporate business inquiry, panel computer, PDA (personal digital assistant), Industry Control, electronic game, choosing song or selecting dish, multimedia teaching, real estate sale etc.Along with the rise of Smart Home and Internet of Things, touch-screen also has very large application potential at the aspect such as family and control terminal.The application of touch-screen on mobile phone, allows the profile of mobile phone become that fashion is frivolous more, has also increased the cordial feeling of man-machine direct interaction, causes warmly pursuing of consumer.

Existing capacitive touch screen, for utilizing the electromagnetic field of human body.Finger siphons away Weak current from contact point, calculates contact point by the current value of measuring four electrodes, in the time that environment temperature, environment of electric field change, all can cause drift and the maloperation of capacitance plate.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of localization method, device and terminal of touch point of touch-screen, the acoustic signals producing can be touched according to touch-screen time, determine the position of touch point, thereby determine the operation intention of user on touch-screen, higher to the adaptive faculty of environment.

For solving the problems of the technologies described above, embodiments of the invention provide technical scheme as follows:

On the one hand, provide a kind of localization method of touch point of touch-screen, comprising:

Step 1, obtains the time of arrival at three different check points of touch-screen from the acoustic signals of a touch point;

Step 2, according to the position of described time of arrival and described check point, obtains the position of described touch point.

Before described step 1, also comprise:

The frequency of the acoustic signals detecting according to described three different check points, judges that whether described acoustic signals is from same touch point.

After described step 2, described method also comprises:

According to default calibration equation, the position of described touch point is calibrated.

Before described step 2, also comprise:

Respectively described acoustic signals is carried out to low frequency enhancing and energy amplification processing, generate acoustic signals after treatment;

Whether the frequency energy that judges described acoustic signals after treatment is all greater than predetermined threshold;

If judged result is no, abandon described acoustic signals.

Described step 2 comprises:

Plane at touch-screen place is set a two-dimensional coordinate system;

Calculate described acoustic signals the time of arrival of the first check point Ta and described acoustic signals poor Δ T1 of the very first time between the time of arrival of the second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of the second check point Tb;

According to predetermined party formula, calculate the position of described touch point;

Described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\ΔT}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\ΔT}2*V$

Wherein, V is sound velocity of wave propagation, D` <sub>x</sub>and D` _ybe respectively horizontal ordinate and the ordinate of position, touch point; A _yand A _xbe respectively horizontal ordinate and the ordinate of the first check point; B _xand B _ybe respectively horizontal ordinate and the ordinate of the second check point; C _xand C _ybe respectively horizontal ordinate and the ordinate of the 3rd check point.

Described calibration equation is:

D _x=(D` _x+ offset.x) * gain.x/ accuracy value

D _y=(D` _y+ offset.y) * gain.y/ accuracy value

Wherein, D`x and D`y are the coordinate figure of position, touch point, Dx and Dy are the coordinate figure of the position, touch point after calibration, gain.x is the amplification factor in X-axis, offset.x is the side-play amount in X-axis, gain.y is the amplification factor in Y-axis, and offset.y is the side-play amount in Y-axis, and accuracy value is the second power of the sampling precision figure place of touch-screen and display screen.

On the other hand, provide a kind of locating device of touch point of touch-screen, it is characterized in that, comprising:

Time-obtaining module, for obtaining the time of arrival at three different check points of touch-screen from the acoustic signals of a touch point;

Position acquisition module, for according to the position of described time of arrival and described check point, obtains the position of described touch point.

The locating device of the touch point of described touch-screen, also comprises:

Calibration module, for according to default calibration equation, calibrates the position of described touch point.

The locating device of the touch point of described touch-screen, also comprises:

Frequency judge module, for the frequency of the acoustic signals that detects according to described three different check points, judges that whether described acoustic signals is from same touch point.

The locating device of the touch point of described touch-screen, also comprises:

Signal processing module, for respectively described three acoustic signals being carried out, low frequency strengthens and energy amplifies processing, generates acoustic signals after treatment;

Whether signal judge module, be all greater than predetermined signal threshold for the frequency energy that judges described acoustic signals after treatment; When judged result is when being, start described position acquisition module; Otherwise, exit treatment scheme.

Described position acquisition module comprises:

Coordinate Setting submodule, sets a two-dimensional coordinate system for the plane at touch-screen place;

The first calculating sub module, for calculate described acoustic signals the time of arrival of the first check point Ta and described acoustic signals poor Δ T1 of the very first time between the time of arrival of the second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of the second check point Tb;

The second calculating sub module, for according to predetermined party formula, calculates the position of described touch point;

Described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is sound velocity of wave propagation, D` <sub>x</sub>and D` _ybe respectively horizontal ordinate and the ordinate of position, touch point; A _yand A _xbe respectively horizontal ordinate and the ordinate of the first check point; B _xand B _ybe respectively horizontal ordinate and the ordinate of the second check point; C _xand C _ybe respectively horizontal ordinate and the ordinate of the 3rd check point.

On the other hand, provide a kind of terminal, comprising:

Time-obtaining module, for obtaining the time of arrival at three different check points of touch-screen from the acoustic signals of a touch point;

Position acquisition module, for according to the position of described time of arrival and described check point, obtains the position of described touch point.

Embodiments of the invention have following beneficial effect:

In such scheme, obtain the time of arrival at least three different check points of touch-screen from the acoustic signals of a touch point; According to the position of described time of arrival and described check point, obtain the position of described touch point.By sound wave, the position of touch point is positioned, in prior art, pass through capacitive touch screen, to the strong adaptability of environment.

Brief description of the drawings

Fig. 1 is the schematic flow sheet of an embodiment of the localization method of the touch point of touch-screen of the present invention;

Fig. 2 is the schematic flow sheet of another embodiment of the localization method of the touch point of touch-screen of the present invention;

Fig. 3 is the structural representation of the locating device of the touch point of touch-screen of the present invention;

Fig. 4 is touch point in touch screen body of the present invention and the schematic diagram of check point.

Embodiment

For technical matters, technical scheme and advantage that embodiments of the invention will be solved are clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.

As shown in Figure 1, be an embodiment of the localization method of the touch point of a kind of touch-screen of the present invention, comprising:

Step 11, obtains the time of arrival at least three different check points of touch-screen from the acoustic signals of a touch point;

Step 12, according to the position of described time of arrival and described check point, obtains the position of described touch point.

Optionally, the localization method of the touch point of described touch-screen, also comprises:

Step 13, according to default calibration equation, calibrates the position of described touch point.

In such scheme, obtain the time of arrival at least three different check points of touch-screen from the acoustic signals of a touch point; According to the position of described time of arrival and described check point, obtain the position of described touch point.By sound wave, the position of touch point is positioned, in prior art, pass through capacitive touch screen, to the strong adaptability of environment.

As shown in Figure 2, be another embodiment of the localization method of the touch point of a kind of touch-screen of the present invention, comprising:

Step 21, the frequency of the acoustic signals detecting according to described three different check points, judges that whether described acoustic signals is from same touch point.

Step 22, obtains the time of arrival at three different check points of touch-screen from the acoustic signals of a touch point;

Step 23, carries out low frequency enhancing to described acoustic signals respectively and energy amplifies processing, generates acoustic signals after treatment;

Step 24, judges whether the frequency energy of described acoustic signals after treatment is all greater than predetermined threshold; If judged result is no, abandon described acoustic signals.If judged result is yes, carry out next step.

Step 25, according to the position of described time of arrival and described check point, obtains the position of described touch point.

Step 26, according to default calibration equation, calibrates the position of described touch point.

Described default calibration equation is:

D _x=(D` _x+ offset.x) * gain.x/ accuracy value;

Dy=(D` _y+ offset.y) * gain.y/ accuracy value;

Wherein, D` <sub>x</sub>and D` _yfor the coordinate figure of position, touch point, D _xand D _yfor the coordinate figure of the position, touch point after calibration, gain.x is the amplification factor in X-axis, and offset.x is the side-play amount in X-axis, and gain.y is the amplification factor in Y-axis, offset.y is the side-play amount in Y-axis, and accuracy value is the second power of the precision figure place of the sampling precision of touch-screen and display screen.

Described step 25 comprises:

Step 251, sets a two-dimensional coordinate system in the plane at touch-screen place;

Step 252, calculate described acoustic signals the time of arrival of the first check point Ta and described acoustic signals poor Δ T1 of the very first time between the time of arrival of the second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of the second check point Tb;

Step 253, according to predetermined party formula, calculates the position of described touch point; Described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is sound velocity of wave propagation, D` <sub>x</sub>and D` _ybe respectively horizontal ordinate and the ordinate of position, touch point; A _yand A _xbe respectively horizontal ordinate and the ordinate of the first check point; B _xand B _ybe respectively horizontal ordinate and the ordinate of the second check point; C _xand C _ybe respectively horizontal ordinate and the ordinate of the 3rd check point.

As shown in Figure 3, be the locating device of the touch point of a kind of touch-screen of the present invention, comprising:

Time-obtaining module 31, for obtaining the time of arrival at three different check points of touch-screen from the acoustic signals of a touch point;

Position acquisition module 32, for according to the position of described time of arrival and described check point, obtains the position of described touch point.

The locating device of the touch point of described touch-screen, also comprises:

Calibration module 33, for according to default calibration equation, calibrates the position of described touch point.

The locating device of the touch point of described touch-screen, also comprises:

Frequency judge module 34, for the frequency of the acoustic signals that detects according to described three different check points, judges that whether described acoustic signals is from same touch point.

The locating device of the touch point of described touch-screen, also comprises:

Signal processing module 35, for respectively described three acoustic signals being carried out, low frequency strengthens and energy amplifies processing, generates acoustic signals after treatment;

Whether signal judge module 36, be all greater than predetermined signal threshold for the frequency energy that judges described acoustic signals after treatment; When judged result is when being, start described position acquisition module; Otherwise, exit treatment scheme.

Described position acquisition module 32 comprises:

Coordinate Setting submodule, sets a two-dimensional coordinate system for the plane at touch-screen place;

The first calculating sub module, for calculate described acoustic signals the time of arrival of the first check point Ta and described acoustic signals poor Δ T1 of the very first time between the time of arrival of the second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of the second check point Tb;

The second calculating sub module, for according to predetermined party formula, calculates the position of described touch point;

Described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is sound velocity of wave propagation, D` <sub>x</sub>and D` _ybe respectively horizontal ordinate and the ordinate of position, touch point; A _yand A _xbe respectively horizontal ordinate and the ordinate of the first check point; B _xand B _ybe respectively horizontal ordinate and the ordinate of the second check point; C _xand C _ybe respectively horizontal ordinate and the ordinate of the 3rd check point.

The invention provides a kind of localization method and device of touch point of the touch-screen based on sound wave.The acoustic signals that touch body is produced at touch-screen is as signal source, poor at the time of reception of three check points by calculating acoustic signals, calculate the range difference of three check points of signal source distance, thereby calculate the coordinate position of signal source (being touch point).

In subsequent treatment, the CPU of terminal gets after the coordinate data of touch point, judges menu or other operation intentions of click place coordinate position representative, carries out corresponding operation response, and response results is shown.

The application scenarios of the localization method of the touch point of the touch-screen based on sonic detection of the present invention is below described.First set a two-dimensional coordinate system in the plane at touch-screen place.As shown in Figure 4, be the schematic diagram of the touch point in touch screen body of the present invention and check point.The coordinate of touch point is that the coordinate of the check point of D` (x, y), three diverse locations is respectively A (x, y), B (x, y), C (x, y) (three point coordinate values are known).The position difference of described three check points.

Step 1, certain position (this position is called touch point) of user's point touching screen body, makes touch screen body produce vibration, produces an acoustic vibration signal, and the acoustic vibration signal of generation is propagated in touch screen body.Touch screen body is the carrier that acoustic signals is propagated.

Step 2, detects acoustic signals at three check point A (x, y), B (x, y), C (x, y).

Step 3, the frequency energy of detection acoustic vibration signal.

Step 4, carries out low frequency to acoustic signals and strengthens energy amplification, the processing such as denoising, energy frequency inverted.

Step 5, after acoustic signals adjustment correction, judges the features such as its energy.If energy is lower than thresholding Q _min, abandon this invalid signals, otherwise proceed next step.In the time that user contacts gently touch-screen or the scenes such as voice signal detected, because signal energy is too low, end process.In the time that user normally clicks touch-screen, acoustic signals is effective, continues next step.

Step 6, measures acoustic vibration signal in the frequency (Fa, Fb, Fc) of three check points, in the time of arrival of three check points (Ta, Tb, Tc).In the time that frequency is consistent, be defined as the acoustic vibration signal from same touch point.Wherein, Fa is the frequency of acoustic vibration signal at the first check point; Fb is the frequency of acoustic vibration signal at the second check point; Fc is the frequency of acoustic vibration signal at the 3rd check point.Ta is the time of arrival of acoustic vibration signal at the first check point; Tb is the time of arrival of acoustic vibration signal at the second check point; Tc is the time of arrival of acoustic vibration signal at the 3rd check point.It will be understood by those skilled in the art that the first check point can be A point, can be also B point or C point.The second check point can be B point, can be also A point or C point.The 3rd check point can be C point, can be also A point or B point.

Step 7, computing time is poor.

| Ta-Tb|=Δ T1 (formula 1)

| Tc-Tb|=Δ T2 (formula 2)

Step 8, calculates the coordinate figure of touch point by following equation.

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\&Delta;T}2*V$

That is to say, in formula 1, formula 2, formula 5, formula 6, formula 7 difference substitution formula 3, formula 4.

Formula 3 and 4 is for calculating range difference.

| L _c-L _a|=Δ T1*V (formula 3)

| L _c-L _b|=Δ T2*V (formula 4)

Wherein, V is acoustic velocity, L _a, L _b, L _cbe respectively A (x, y), B (x, y), C (x, y) to touch point D` (x, y) distance.

$\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}=L_C$ (formula 5)

$\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}=L_B$ (formula 6)

$\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}=L_A$ (formula 7)

Step 9, terminal is calibrated D` (x, y).

Step 10, the menu that the coordinate figure of the D` (x, y) after terminal judges calibration represents on current page or operation intention, carry out corresponding response and process, and shows according to response results.

In above-mentioned application scenarios, the resolution (depending on the precision of detection sub-module) of touch screen body and the resolution (depending on the IC of LCD) of LCD may be inconsistent, and the origin of touch screen body and the origin of LCD also may be inconsistent.Therefore, the coordinate figure of the touch-screen of the touch point calculating need to be converted into the coordinate figure of LCD display matrix.In addition, the error between touch-screen and LCD also can have influence on the precision of coordinate figure, for example: machine error (there is skew etc. the position between touch-screen and LCD), the amplification factor of Conversion of Energy or operator's maloperation etc.Calibration process is for transforming coordinate figure, by error minimize.

The first situation is:, set a two-dimensional coordinate system in the plane at touch-screen place; Set a two-dimensional coordinate system in the plane at display screen place, and the true origin of described touch-screen and LCD consistent (for example, being all that the upper left corner is true origin), the sampling precision of touch-screen and LCD is all 10,2 ¹⁰=1024.

Calibration equation is:

D _x=(D` _x+ offset.x) * gain.x/ accuracy value

D _y=(D` _y+ offset.y) * gain.y/ accuracy value

Wherein, D` <sub>x</sub>and D` _yfor the coordinate figure of touch point on touch-screen, D _xand D _yfor the coordinate figure of the touch point after calibration on LCD, gain.x is the amplification factor in X-axis, and offset.x is the side-play amount in X-axis, and gain.y is the amplification factor in Y-axis, and offset.y is the side-play amount in Y-axis.In this application scene, the sampling precision of touch-screen and LCD is 10, and therefore, accuracy value is 1024, namely 2 ¹⁰.

The generative process of calibration equation is as follows, comprising:

Step 1, sends A point coordinate value (Ax, Ay) to the display module of locating device, for example, be A (20,20);

Step 2, display module shows A (20,20) point on LCD display matrix.If have skew because machine error causes touch screen body and LCD, the position of the A point that in fact user sees in touch screen body become A` point.In the time clicking A`, the coordinate data that passes to position acquisition module should be (20,20), therefore needs by calibration, and the position correction that A` is ordered is coordinate figure A (20,20).

Step 3, user clicks A` point.

Step 4, by equation 21 and 22, calculates the coordinate (A`x, A`y) of coordinate figure A`.For example, the formula that A` (125,150) is calibrated to A (20,20) is:

A _x=(A` _x+ offset.x) * gain.x/1024 formula (10)

A _y=(A` _y+ offset.y) * gain.y/1024 formula (11)

Substitution formula 10 and formula 11, be specially:

20=(125+offset.x) * gain.x/1024 (formula 13)

20=(150+offset.y) * gain.y/1024 (formula 14)

Step 5, display module shows B (80,150) point on LCD display matrix.The position of the B point that user sees in touch screen body become B` point.

Step 6, user clicks B` point.

Step 7, locating device calculates the coordinate of coordinate figure B` (B`x, B`y).For example, the formula that B` (505,1138) is calibrated to B (80,150) is:

80=(505+offset.x) * gain.x/1024 (formula 15)

150=(1138+offset.y) * gain.y/1024 (formula 16)

Step 8, can be calculated by the formula (formula 13 and formula 15) of two x axles:

gain.x＝161；offset.x＝2

Formula (formula 14 and formula 16) by two y axles can calculate:

gain.y＝134.7，offset.y＝2。

So can draw calibration equation:

D _x＝(D` _x+offset.x)*gain.x/1024

D _y＝(D` _y+offset.y)*gain.y/1024

Wherein, D` (D` _x, D` _y) be the coordinate calculating after user clicks in touch screen body, the displaing coordinate that D (Dx, Dy) shows for the LCD after calibrating.

That is: D _x=(D` _x+ 2) * 161/1024

D _y＝(D` _y+2)*134.7/1024

The proof procedure of calibration equation is below described.Be specially: user clicks after C`, detection module is scaled the coordinate figure above LCD the C` coordinate receiving by calibration equation, then, with the comparison of C point coordinate, calibration equation is verified.Concrete steps comprise as follows:

Step 1, display module on LCD display matrix C ₁(50,80) point shows.The C that user sees ₁the position of point in touch screen body become C` point.

Step 2, user clicks C` point.

Step 3, detection module calculates the coordinate of coordinate figure C` (C`x, C`y), for example C` (310,600).Substitution calibration equation removes to calculate the coordinate of the upper C of LCD:

C _x＝(C`x+2)*161/1024

C _y＝(C`y+2)*134.7/1024

C _x＝(310+2)*161/1024

C _y＝(600+2)*134.7/1024

Calculate: C _2x=49.05; C _2y=79.2.

Step 4, by C ₂relatively, error is in 1 resolution, so think that calibration equation is satisfactory for (49.05,79.2) and C (50,80).

The second situation: suppose that the resolution of LCD and the resolution of touch screen body are inconsistent, the true origin of LCD and the true origin of touch screen body are inconsistent.For example, the true origin of LCD is in the lower right corner, and resolution is 96*128; The true origin of touch screen body is in the upper left corner, and resolution is 800*1000, and sampling precision is all 10, and 2 ¹⁰=1024.Can similarly release formula:

D _x＝96-(D` _x+2)*161/1024

D _y＝128-(D` _y+2)*134.7/1024

The method of calibration and corresponding formula have a variety of, and above-mentioned is one of them example.

Calibration process is below described.If the coordinate figure of the touch point calculating on transverse axis and the longitudinal axis of display screen is respectively D`x, D`y.

Adopt above-mentioned calibration equation, calculate Dx and Dy.

D _x＝(D` _x+2)*161/1024

D _y＝(D` _y+2)*134.7/1024。

On the other hand, the invention provides a kind of terminal, comprising:

Time-obtaining module, for obtaining the time of arrival at least three different check points of touch-screen from the acoustic signals of a touch point;

Position acquisition module, for according to the position of described time of arrival and described check point, obtains the position of described touch point.

Described terminal can be multimedia interactive device, mobile phone, PDA (personal digital assistant), panel computer etc.

The present invention measures by sonic transmissions, and compared with existing touch-screen, simple in structure, low in energy consumption, cost is low, and light transmission is good, does not affect imaging, and accommodative ability of environment is strong.Not disturbed by extraneous light.

It will be understood by those skilled in the art that the invention is not restricted to check point is three, can be for being greater than three, make definite position, touch point more accurate.

Described embodiment of the method is corresponding with described device embodiment, the description of relevant portion in the part comparable device embodiment not describing in detail in embodiment of the method, the description of relevant portion in the part reference method embodiment not describing in detail in device embodiment.

One of ordinary skill in the art will appreciate that, the all or part of step realizing in above-described embodiment method is can carry out the hardware that instruction is relevant by program to complete, described program can be stored in a computer read/write memory medium, this program is in the time carrying out, comprise the step as above-mentioned embodiment of the method, described storage medium, as: magnetic disc, CD, read-only store-memory body (Read-Only Memory, or random store-memory body (Random Access Memory, RAM) etc. ROM).

In the each embodiment of the method for the present invention; the sequence number of described each step can not be used for limiting the sequencing of each step; for those of ordinary skill in the art, do not paying under the prerequisite of creative work, the priority of each step is changed also within protection scope of the present invention.

The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (9)

1. a localization method for the touch point of touch-screen, is characterized in that, comprising:

Step 1, obtains the time of arrival at three different check points of touch-screen from the acoustic signals of a touch point;

Step 2, according to the position of described time of arrival and described check point, obtains the position of described touch point, comprising: the plane at touch-screen place is set a two-dimensional coordinate system;

Calculate described acoustic signals the time of arrival of the first check point Ta and described acoustic signals poor Δ T1 of the very first time between the time of arrival of the second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming △ T2 between the time of arrival of the second check point Tb;

According to predetermined party formula, calculate the position of described touch point, described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is sound velocity of wave propagation, D` <sub>x</sub>and D` _ybe respectively horizontal ordinate and the ordinate of position, touch point; A _yand A _xbe respectively horizontal ordinate and the ordinate of the first check point; B _xand B _ybe respectively horizontal ordinate and the ordinate of the second check point; C _xand C _ybe respectively horizontal ordinate and the ordinate of the 3rd check point.

2. the localization method of the touch point of touch-screen according to claim 1, is characterized in that, before described step 1, also comprises:

The frequency of the acoustic signals detecting according to described three different check points, judges that whether described acoustic signals is from same touch point.

3. the localization method of the touch point of touch-screen according to claim 1, is characterized in that, after described step 2, described method also comprises:

According to default calibration equation, the position of described touch point to be calibrated, described calibration equation is:

Wherein, D` <sub>x</sub>and D` _yfor the coordinate figure of position, touch point, D _xand D _yfor the coordinate figure of the position, touch point after calibration, gain.x is the amplification factor in X-axis, and offset.x is the side-play amount in X-axis, and gain.y is the amplification factor in Y-axis, offset.y is the side-play amount in Y-axis, and accuracy value is the second power of the sampling precision figure place of touch-screen and display screen.

4. the localization method of the touch point of touch-screen according to claim 1, is characterized in that, before described step 2, also comprises:

Respectively described acoustic signals is carried out to low frequency enhancing and energy amplification processing, generate acoustic signals after treatment;

Whether the frequency energy that judges described acoustic signals after treatment is all greater than predetermined threshold;

If judged result is no, abandon described acoustic signals.

5. a locating device for the touch point of touch-screen, is characterized in that, comprising:

Time-obtaining module, for obtaining the time of arrival at three different check points of touch-screen from the acoustic signals of a touch point;

Position acquisition module, for according to the position of described time of arrival and described check point, obtains the position of described touch point, comprising: Coordinate Setting submodule, set a two-dimensional coordinate system for the plane at touch-screen place;

The first calculating sub module, for calculate described acoustic signals the time of arrival of the first check point Ta and described acoustic signals poor △ T1 of the very first time between the time of arrival of the second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of the second check point Tb;

The second calculating sub module, for according to predetermined party formula, calculates the position of described touch point, and described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is sound velocity of wave propagation, D` <sub>x</sub>and D` _ybe respectively horizontal ordinate and the ordinate of position, touch point; A _yand A _xbe respectively horizontal ordinate and the ordinate of the first check point; B _xand B _ybe respectively horizontal ordinate and the ordinate of the second check point; C _xand C _ybe respectively horizontal ordinate and the ordinate of the 3rd check point.

6. the locating device of the touch point of touch-screen according to claim 5, is characterized in that, also comprises:

Calibration module, for according to default calibration equation, calibrates the position of described touch point, and described calibration equation is:

Wherein, D` <sub>x</sub>and D` _yfor the coordinate figure of position, touch point, D _xand D _yfor the coordinate figure of the position, touch point after calibration, gain.x is the amplification factor in X-axis, and offset.x is the side-play amount in X-axis, and gain.y is the amplification factor in Y-axis, offset.y is the side-play amount in Y-axis, and accuracy value is the second power of the sampling precision figure place of touch-screen and display screen.

7. the locating device of the touch point of touch-screen according to claim 5, is characterized in that, also comprises:

Frequency judge module, for the frequency of the acoustic signals that detects according to described three different check points, judges that whether described acoustic signals is from same touch point.

8. the locating device of the touch point of touch-screen according to claim 5, is characterized in that, also comprises:

Signal processing module, for respectively described three acoustic signals being carried out, low frequency strengthens and energy amplifies processing, generates acoustic signals after treatment;

Whether signal judge module, be all greater than predetermined signal threshold for the frequency energy that judges described acoustic signals after treatment; When judged result is when being, start described position acquisition module; Otherwise, exit treatment scheme.

9. a terminal, is characterized in that, comprising:

Time-obtaining module, for obtaining the time of arrival at three different check points of touch-screen from the acoustic signals of a touch point;

Position acquisition module, for according to the position of described time of arrival and described check point, obtains the position of described touch point, comprising: Coordinate Setting submodule, set a two-dimensional coordinate system for the plane at touch-screen place;

The first calculating sub module, for calculate described acoustic signals the time of arrival of the first check point Ta and described acoustic signals poor Δ T1 of the very first time between the time of arrival of the second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of the second check point Tb;

The second calculating sub module, for according to predetermined party formula, calculates the position of described touch point, and described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is sound velocity of wave propagation, D` <sub>x</sub>and D` _ybe respectively horizontal ordinate and the ordinate of position, touch point; A _yand A _xbe respectively horizontal ordinate and the ordinate of the first check point; B _xand B _ybe respectively horizontal ordinate and the ordinate of the second check point; C _xwith _cy is respectively horizontal ordinate and the ordinate of the 3rd check point.