CN102253747B - Method for identifying surface touch by touch screen - Google Patents
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- CN102253747B CN102253747B CN201110186697.2A CN201110186697A CN102253747B CN 102253747 B CN102253747 B CN 102253747B CN 201110186697 A CN201110186697 A CN 201110186697A CN 102253747 B CN102253747 B CN 102253747B
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Abstract
The invention discloses a method for identifying surface touch by a touch screen. In the method, the equivalent projection width information of a touch body in a direction corresponding to a coordinate axis, and a coordinate of a touch position are input into an upper computer, and the upper computer judges a touch state according to the touch position and the size of a touch surface. The position coordinate of the touch body can be output normally, the equivalent projection width information of the touch body in the direction corresponding to the coordinate axis can be output, the touch coordinate and the projection width of the effective touch part of the touch body in the direction of the coordinate axis are obtained, and the touch state of the effective surface of the touch body is reflected.
Description
Technical field
The present invention relates to a kind of location and the face of touch inductive sensory system of touching, relate in particular to a kind of method that touch-screen identification face touches.
Background technology
Along with the development of computer technology and universal, universal or special computer application field is more and more extensive, increasing to human-computer interaction device's demand.Touch-screen is as typical human-computer interaction device, and demand is also at expanding day.Common touch-screen has touch screens, capacitance plate, infrared screen, surface acoustic wave touch screen, optical touch screen, projecting type capacitor screen etc.
At present, the ultimate principle of touch-screen is to set up the axis projection scanning field (as optical projection, infrared ray distribution, ultra sonic scanner, resistance/capacitance induction etc.) of certain rule at effective Petting Area, in the time that touch body causes these variation, the scanning detection signal that touch screen controller is corresponding changes thereupon, by the processing to signal, extract corresponding one or more touch points location coordinate information, apply very general.
But along with the continuous variation of application demand, the particularly constantly universal and application of the gesture identification of man-machine interaction in recent years to operation, touch-screen only can reliable detection touches the location point coordinate information of body, only, by single-point positional information, is difficult to meet colourful man-machine interactive operation requirement.As, the touch of emulation mouse, the left button down state that differentiation mouse is conventional or the movement of lifting status cursor, current some touch manner transmission is pressed, is lifted or mobile operation, carry out and pull or move, can only switch in conjunction with UP/DOWN option, cannot, as mouse, pull or mobile switching in conjunction with convenient execution of left button; Distinguish the single hit and dblclick of mouse, current some touch manner can only touch once with twice by differentiation and realize, and because the coordinate of twice touch easily changes, is probably judged as movement by host computer, thereby with mouse ratio, the fault rate of double-click will increase greatly.And for example, because a touch manner is only reported the touch action that touches body, the position coordinates of touch, maybe can not realize and report all the other features that touch body, cannot react other touch features that touch body, play corresponding shape, the size etc. of touch agency part as touched body.Distinguish the touch operation of the different large wisps of pen, erasing rubber, finger, fist, palm etc., therefore can not judge the variation that touches body.
In order to distinguish or define different operations by touch, just require touch-screen that the more information that touches body can be provided.Much touch-screen producer is devoted to the improvement of touch-screen by different modes.
Two fingers of some hypothesis are not to touch simultaneously, introduce sequential and judge, survey 2 touches, but in the time that two fingers are touched simultaneously, system just cannot judge with this.
For another example surface acoustic wave touch screen has the 3rd axle Z axis, namely pressure axis response message, there is this information, each touch point is not only just two simple states that have touch and no touch, can judge whereby that touching weight changes, design abundanter interactive program, but pressure axis response have certain limitation, " pressure " of its reaction only just has stable corresponding relation with touch pressure at some specified conditions, is difficult to effectively reflection and touches weight variation.However, also not all touching technique all has pressure axis response.
Such as infrared, the sound wave multiple spot recognition technology of development at present, the mode detecting by increasing additional shaft, so as to realizing multiple point touching, can identify the particular location of limited touch point again.Multiple point touching is by the various combination of multiple touch points, as single touch, multiple touch, relative position between touch point changes, transmit different operations, can be applied to the detection of any touch gestures, make application interface versatile and flexible, both when ten fingers of both hands can have been detected, touched, also allow other non-finger touch forms, such as palm, face, fist etc., even wear gloves also passable, it is the man-machine interface mode of hommization, be well suited for the application that many hands operate simultaneously, such as game control.But the touch-screen of identifying by increasing the multiple spot of additional shaft, structure, circuit complexity, processing and debugging, use, maintenance are all than single-point identification touch-screen difficulty, and cost is also higher, and the application of multiple point touching also has larger limitation.Sound wave two point touch-screen as described in patent CN201576267, by increasing striped array and transducer, form oblique (Z axis) location, due to increase striped array can not with the overlapping distribution of original striped, in order to place the striped array of increase, can only increase screen body border width, not only increase screen body size, also increased the complicacy of striped, striped processed finished products rate can be affected.Because transducer increases, lead-in wire also increases, and signal scanning receiving circuit increases thereupon, and may pass other striped arrays for the signal of disalignment scanning, and signal quality also can be influenced, and debugging difficulty is corresponding increase also.
In a word, existing touch-screen, no matter be single-point, two point or multi-point touch panel, conventionally be all that the touch that touches body is abstracted into limited touch that there is no the abstract point of size, shape, export the position coordinates of single or discrete multiple touch points, and ignore the physical features of the touch body comprising in detection signal itself, can not embody the geometric shape information that touches body.
Summary of the invention
The object of the invention is to overcome the problems referred to above that existing touch-screen exists, a kind of method that provides touch-screen identification face to touch, the present invention can normally export the position coordinates that touches body, can export again and touch body in the axial equivalent projection width of correspondence data, what obtain is that touch coordinate and touch body touch the projection width of live part at change in coordinate axis direction, embodies the touch situation that touches body significant surface.
For achieving the above object, the technical solution used in the present invention is as follows:
The method that touch-screen identification face touches, is characterized in that: will touch body in the axial equivalent projection width of respective coordinates information, and input to host computer together with touch position coordinates, host computer judges touch condition by touch location, touch face size.
The equivalent projection width of described touch body comprises that x direction of principal axis touches body equivalence projection width and y direction of principal axis touches body equivalence projection width.
Described touch body corresponding touch body width in the time that x change in coordinate axis direction causes touch scanning change in detection signal is that x direction of principal axis touches body equivalence projection width.
Described touch body corresponding width in the time that y change in coordinate axis direction causes touch scanning change in detection signal is that y direction of principal axis touches body equivalence projection width.
Described equivalent projection width value draws by following process:
A, process on basis at the existing signal of touch-screen, within each scan period of touch screen controller, scanning detection signal corresponding to X coordinate direction obtaining, subtracts each other and obtains difference with the reference signal of X coordinate;
B, judge these differences one by one, start counting from first non-vanishing difference signal, to the last a non-vanishing difference counting finishes, and the count value obtaining is corresponding in the equivalent projection width value of x coordinate direction with this touch body;
C, in like manner, within each scan period of touch screen controller, scanning detection signal corresponding to Y coordinate direction obtaining, relatively obtains difference with the reference signal of Y coordinate;
D, judge these differences one by one, start counting from first non-vanishing difference signal, to the last a non-vanishing difference counting finishes, and the count value obtaining is corresponding in the equivalent projection width value of Y coordinate direction with this touch body;
E, correspondence is touched to the equivalent projection width value of body X, Y direction and the coordinate figure of the touch-screen detection Output rusults as touch-screen.
In described a step and c step, relatively time, according to screen body size, undesired signal situation, difference threshold is set, what difference was less than threshold value is zero processing by difference, reduces or eliminate the impact of undesired signal.
In described b step and d step, according to the size of touch-screen corresponding to hits, scanning work mode (rectangular coordinate scanning, polar coordinate scanner), revised or demarcated.
The D0 of projection width of described demarcation calculates as follows:
In formula, N represents scanning sample number, and W is that (to rectangular coordinate scanning, screen body scope represents the size of direction of scanning to the corresponding screen body range of size scanning; To polar coordinate scanner, screen body scope represents the angle of direction of scanning), D is the touch projection width count value obtaining in b step and d step.
Employing the invention has the advantages that:
One, adopt the present invention, can normally export the position coordinates that touches body, can export again and touch body in the axial equivalent projection width of correspondence data, what obtain is to touch body to touch the projection width of live part at change in coordinate axis direction, thereby, what embody is the touch situation that touches body significant surface, and the response by common touch-screen to abstract touch point has been modified into the response of the touch face to having a certain size and shape.
Two, adopt the present invention, according to each axis projection wide variety, can analyze the state that identification touches the touch face of body, as size variation, change of shape etc., and touch size, shape, the touch manner (as dynamics, inclination, rotation etc.) of body by change, the variation of the touch face causing is flexile, thereby can transmit more gesture information by simple touch operation, contribute to the more man-machine interfaces more easily of design.
Three, adopt after the present invention, the equivalent projection width of touch-screen output, embody the feature that touches body equivalence projecting plane, what respond is the touch situation of corresponding significant surface, and the variation of significant surface can be unlimited various, can represent infinite gesture information, this is for having the identification of limited discrete point, and the multiple spot technology of only exporting abstract touch point coordinate position cannot be compared.
Four, the present invention goes for single-point or the multiple spot identification touch-screen of multiple touching technique, as surface acoustic wave touch screen, infrared touch panel, optical touch screen, projecting type capacitor screen etc.
Five, the present invention is not changing touch screen structure, circuit, does not increase under hardware cost condition, can normally export the position coordinates that touches body, and exportable touch body, in the axial equivalent projection width of correspondence data, is convenient to implement again.
Six, in the present invention, relatively time, according to screen body size, undesired signal situation, difference threshold is set, reduces or eliminate the impact of undesired signal, make the projection width of output more reliable consistent.
Seven, in the present invention, according to the size of touch-screen, scanning work mode, revised or demarcated, can make equivalent projection width and physical size measure consistent, be convenient to analyze relatively.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 structural representation
Fig. 2 is that the scanning of Fig. 1 receives signal graph
Fig. 3 is the embodiment of the present invention 2 structural representations
Fig. 4 is that the scanning of Fig. 3 receives signal graph
Fig. 5 a touches the structural representation of body when vertical with the plane of scanning motion in embodiment 3
Fig. 5 b touches the structural representation of body in the time that the plane of scanning motion tilts in embodiment 3
Fig. 5 c touches the structural representation that body is vertical with the plane of scanning motion and rotate to an angle in embodiment 3
Fig. 5 d is the structural representation that touches body and 90-degree rotation vertical with the plane of scanning motion in embodiment 3
In figure, be labeled as: 1, threshold value, 2, infrared receiving tube, 3, infrared transmitting tube, 4, threshold value, 5, pit, 6, pit width, 7, transmitting transducer, 8, receiving transducer, 9, reflection strip, 10, touch body.
Embodiment
This embodiment is take infrared screen as basic embodiment.As figure, infrared touch panel is to utilize infrared receiving/transmission wire matrix densely covered in X, Y direction to detect the also touch of consumer positioning.Infrared transmitting tube and infrared receiving tube are distributed in screen four limits, form the infrared ray matrix anyhow intersecting.User, in the time of touch screen, touches body and will block the infrared ray through the direction anyhow of this position, corresponding signal can change (being the pit that sink in figure).As figure, the infrared ray that touch body blocks is more, and the pit causing is wider, touch the effective width that body is corresponding just wider, under the certain condition of threshold value, the width D x of pit, Dy, at x, the corresponding width of the signal intensity that y direction causes has corresponding relation with touch body.Controller output pit width data, can reflect that touch body causes the characteristic dimension of the part of signal intensity.
Due to X, the equivalent projection width acquisition methods of Y-direction is identical, is only illustrated as an example of X-axis example below.There are 8 pairs of infrared emission to receive in X-direction pipe successively scanning is touched to effective district, every pair of infrared emission receives pipe is equivalent to a sampled point, in the time not touching body and block infrared light, the signal that each receiving tube receives is consistent, touch sampling reference value (due to factor impacts such as environment, reference signal needs real-time update) by sampling conduct.
Supposing that 8 pairs of transmittings receive is distributed in the scope of 80 centimetres pipe, the Petting Area width W that so each power valve or receiving tube are corresponding is 10 centimetres, touch body width and be greater than 10 centimetres, just can block the light of a pair of transmit-receive tube, touch body width and be greater than 80 centimetres, just can block the light of whole transmit-receive tubes.
In actual process, controller only need be according to the sagging pit that receives signal, and judgement is processed, the number of the transmit-receive tube that obtains being blocked, can reflect the size that touches body, and numerical value is larger, touch body just larger, represented the equivalent projection width (D) that touches body.Sometimes,, in order to reflect actual size, can calculate according to following formula the calibration value D0 of the equivalent projection width that touches body:
In the present embodiment, N represents that infrared emission receives pipe number, it is 8 pairs, be that hits is 8, W represents the Petting Area width W of the directions X that infrared scan is corresponding, is 80 centimetres, according to the number that calculates the transmit-receive tube being blocked obtaining, be the equivalent D of projection width, can be by D0=10*D(centimetre) demarcate the calibration value that obtains the equivalent projection width that touches body.
Setting parameter that the present embodiment is done is just to being convenient to explain the implication of equivalent projection width, but be not limited to these concrete parameters, also be not limited to other conditions, such as screen body size difference, scanning receive spread pattern, distribution density to pipe, scan mode etc.
This embodiment is take surface acoustic wave touch screen as basic embodiment.As figure, the upper left corner of screen body and the lower right corner are each have been fixed vertically and the ultrasound transmitting transducer of horizontal direction, and two corresponding ultrasound wave receiving transducers have been fixed in the upper right corner.Four peripheries of screen have 45 ゜ angles by the reflection strip of dredging close spacing.
In not touching, receive the waveform of signal with just the same with reference to waveform.In the time pointing or other can absorb or stop the object touch screen of acoustic wave energy, the sound wave of propagating along X or the Y-axis body that is touched partially absorbs, be reflected on reception waveform is that on a certain moment correspondence position, waveform has a decay breach, touching under the condition that body material is certain, threshold value is certain, cause that the surface of contact of touch is at x, the width of y direction is wider, at x, the signal pit width that y direction causes is wider, and the two has corresponding relation.Controller output pit width data, can reflect that touch body causes the characteristic dimension of the part of signal intensity.
This embodiment is take infrared touch panel as basis, and touching body is regular rectangular parallelepiped.By common touch working method, host computer can only obtain the location coordinate information that touches body, rectangular parallelepiped with respect to the mutual relationship of the face of touch such as vertical, inclination etc. cannot obtain.When adopting the present invention, when controller is exported after the equivalent projection width that touches body simultaneously, host computer just can be according to touching the each axial equivalent projection width of body, analyze judgement the spatiality that touches body.
As figure (a), cross-sectional length is Dx, and width is Dy, and owing to touching, body is vertical with the plane of scanning motion, the X of touch-screen output, and the equivalent projection width of Y-direction and cross-sectional length Dx, width D y equates respectively.
In the time that rectangular parallelepiped tilts, as figure (b), now, the equivalent projection width that touches body Y-direction is constant, and Dy1 equals Dy; The equivalent projection width that touches body directions X is Dx1, and larger than Dx, host computer can judge the inclined degree of rectangular parallelepiped at XZ face according to this feature.
In the time that rectangular parallelepiped rotates, as figure (c), the X of touch-screen output, the equivalent Dx2 of projection width, the Dy2 of Y-direction are along with variation, and host computer can be judged the rotation of rectangular parallelepiped at XY face according to the variation of the equivalent Dx2 of projection width, Dy2.
When rectangular parallelepiped is in the time that the dextrorotation of XY face turn 90 degrees, as figure (d), the equivalent projection width of the directions X of touch-screen output is Dx2, and Dy equates with cross-sectional width; The equivalent projection width of the Y-direction of touch-screen output is Dy2, with cross-sectional length Dx, equates.
For same rectangular parallelepiped, host computer can be according to its sectional dimension and equivalent projection size, the space inclination mode of analytical calculation rectangular parallelepiped, and the different gestures that touches body can represent many different touch action: the touch of scheming (a) mode as defined represents cursor movement, represent drag operation with the touch of scheming (d) mode, same touch body, only needs rotation direction, just represents different operations.
Embodiment 4
The method that touch-screen identification face touches, will touch body in the axial equivalent projection width of respective coordinates information, input to host computer together with touch position coordinates, and host computer judges touch condition by touch location, touch face size.
In the present invention, the equivalent projection width of described touch body comprises that x direction of principal axis touches body equivalence projection width and y direction of principal axis touches body equivalence projection width.
In the present invention, described touch body corresponding touch body width in the time that x change in coordinate axis direction causes touch scanning change in detection signal is that x direction of principal axis touches body equivalence projection width.
In the present invention, described touch body corresponding width in the time that y change in coordinate axis direction causes touch scanning change in detection signal is that y direction of principal axis touches body equivalence projection width.
Described equivalent projection width value draws by following process:
A, process on basis at the existing signal of touch-screen, within each scan period of touch screen controller, scanning detection signal corresponding to X coordinate direction obtaining, subtracts each other and obtains difference with the reference signal of X coordinate;
B, judge these differences one by one, start counting from first non-vanishing difference signal, to the last a non-vanishing difference counting finishes, and the count value obtaining is corresponding in the equivalent projection width value of x coordinate direction with this touch body;
C, in like manner, within each scan period of touch screen controller, scanning detection signal corresponding to Y coordinate direction obtaining, relatively obtains difference with the reference signal of Y coordinate;
D, judge these differences one by one, start counting from first non-vanishing difference signal, to the last a non-vanishing difference counting finishes, and the count value obtaining is corresponding in the equivalent projection width value of Y coordinate direction with this touch body;
E, correspondence is touched to the equivalent projection width value of body X, Y direction and the coordinate figure of the touch-screen detection Output rusults as touch-screen.
In described a step and c step, relatively time, according to screen body size, undesired signal situation, difference threshold is set, what difference was less than threshold value is zero processing by difference, reduces or eliminate the impact of undesired signal.
In described b step and d step, according to the size of touch-screen corresponding to hits, scanning work mode, revised or demarcated.Scanning work mode generally comprises rectangular coordinate scanning, polar coordinate scanner.
The D0 of projection width of described demarcation calculates as follows:
In formula, N represents scanning sample number; W is the screen body range of size of corresponding scanning, and to rectangular coordinate scanning, screen body scope represents the size of direction of scanning, and to polar coordinate scanner, screen body scope represents the angle of direction of scanning; D is the touch projection width count value obtaining in b step and d step.
Claims (4)
1. the method that touch-screen identification face touches, is characterized in that: will touch body in the axial equivalent projection width of respective coordinates information, and input to host computer together with touch position coordinates, host computer judges touch condition by touch location, touch face size;
Described equivalent projection width value draws by following process:
A, process on basis at the existing signal of touch-screen, within each scan period of touch screen controller, scanning detection signal corresponding to X coordinate direction obtaining, subtracts each other and obtains difference with the reference signal of X coordinate;
B, judge these differences one by one, start counting from first non-vanishing difference signal, to the last a non-vanishing difference counting finishes, and the count value obtaining is corresponding in the equivalent projection width value of X coordinate direction with this touch body;
C, in like manner, within each scan period of touch screen controller, scanning detection signal corresponding to Y coordinate direction obtaining, relatively obtains difference with the reference signal of Y coordinate;
D, judge these differences one by one, start counting from first non-vanishing difference signal, to the last a non-vanishing difference counting finishes, and the count value obtaining is corresponding in the equivalent projection width value of Y coordinate direction with this touch body;
E, correspondence is touched to the equivalent projection width value of body X, Y direction and the coordinate figure of the touch-screen detection Output rusults as touch-screen;
The equivalent projection width of described touch body comprises that X-direction touches body equivalence projection width and Y direction touches body equivalence projection width;
Described touch body corresponding touch body width in the time that X change in coordinate axis direction causes touch scanning change in detection signal is that X-direction touches body equivalence projection width;
Described touch body corresponding width in the time that Y change in coordinate axis direction causes touch scanning change in detection signal is that Y direction touches body equivalence projection width.
2. the method that touch-screen identification face according to claim 1 touches, it is characterized in that: in described b step and d step, according to screen body size, undesired signal situation, difference threshold is set, in the time judging difference, what difference was less than threshold value is zero processing by difference, reduces or eliminate the impact of undesired signal.
3. the method that touch-screen identification face according to claim 2 touches, is characterized in that: in described b step and d step, according to the size of touch-screen corresponding to hits, scanning work mode, projection width is revised or demarcated.
4. the method that touch-screen identification face according to claim 3 touches, is characterized in that: the D0 of projection width of described demarcation calculates as follows:
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| CN104216549B (en) * | 2013-06-04 | 2018-10-12 | 联想(北京)有限公司 | A kind of information processing method and electronic equipment |
| CN112306306A (en) * | 2020-10-29 | 2021-02-02 | 业成科技（成都）有限公司 | Method for judging touch event |
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| CN101893961A (en) * | 2010-07-09 | 2010-11-24 | 苏州瀚瑞微电子有限公司 | Ghost point identification method for three-dimensional touch system |
| CN102096516A (en) * | 2009-12-15 | 2011-06-15 | 北京汇冠新技术股份有限公司 | Touch positioning method |
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| CN101398733B (en) * | 2007-09-26 | 2010-09-08 | 福建星网锐捷通讯股份有限公司 | Two-point touch processing method of touch screen |
| US8154529B2 (en) * | 2009-05-14 | 2012-04-10 | Atmel Corporation | Two-dimensional touch sensors |
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| CN102096516A (en) * | 2009-12-15 | 2011-06-15 | 北京汇冠新技术股份有限公司 | Touch positioning method |
| CN101893961A (en) * | 2010-07-09 | 2010-11-24 | 苏州瀚瑞微电子有限公司 | Ghost point identification method for three-dimensional touch system |
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