Summary of the invention:
The present invention adopts the multi-point touch panel Petting Area is carried out the method that subregion combines with sound ranging, realizes multiple point touching.In two coordinate figures of two dimensional surface coordinate system, a principle that coordinate figure is identical is arranged according to the each point in the same area, the multi-point touch panel Petting Area is divided into a plurality of zones.With [x, y] plane right-angle coordinate is example, as shown in Figure 1, according to the identical principle of the y coordinate figure of each point in the same area, is a plurality of zones with screen divider.The differentiation in each zone of touch-screen, one or more methods that can pass through in the methods such as frequency of sound wave, working time section, acoustic-electrical transducer array realize.Distinguish by frequency of sound wave and to be meant: it is identical that frequency by determining the sound wave that acoustic-electrical transducer receives and sound wave send the used frequency of sound wave of zone location, determines the sound wave The corresponding area that receives; Distinguish by the working time section and to be meant: each zone works alone in different time sections, and the moment that arrives acoustic-electrical transducer by sound wave is determined its The corresponding area.Distinguish and distinguish two kinds of methods by the time period and also can use simultaneously by frequency, specific implementation method is that All Ranges is divided into a plurality of groups, each group works alone in different time sections, and a plurality of zones of working simultaneously in group are distinguished by frequency each other.The acoustic-electrical transducer array is distinguished and is meant and adopts a plurality of acoustic-electrical transducers, and is corresponding one by one with each zone, by the acoustic-electrical transducer that receives sound wave determine sound wave from the zone.After having determined the zone that sound wave sends, as long as the method by sound ranging records another coordinate figure, the coordinate figure that this coordinate figure and sound wave is sent the zone carries out x, and the y value is matched, and can obtain sound wave and send the some coordinate on screen.The y coordinate figure that in each zone of touch-screen is definite value is stored in the storer of system by system intialization.
With Fig. 1 is example, and when touch-screen was started working, touch-screen system received the sound wave that an a sends, and can determine that by one or more of above method it is from regional H.From being issued to the time that arrives acoustic-electrical transducer, calculate the x coordinate figure x1 of an a by this sound wave, match by y coordinate y1 with regional H, obtain an a two-dimensional coordinate (x1, y1).Repeat said process, obtain the corresponding information of acoustic wave of each point on the H zone.The information of acoustic wave of the point in each zone is spliced, obtain the information of acoustic wave that each point on the whole touch screen sends sound wave.According to the touch screen design scheme, select respective algorithms, carry out multiple spot identification.
Embodiment:
Below in conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4 and embodiment, the present invention done describing in further detail.
Example one: this example adopts the method for working time section to distinguish each zone.As shown in Figure 2: the 1st, the skin glass that shields, the 2nd, electroacoustic conversion layer, the 3rd, drive electrode layer, the 4th, glass substrate.As shown in Figure 4: the 5th, acoustic-electrical transducer.Electroacoustic conversion layer and drive electrode layer electrical equipment are communicated with, and electroacoustic conversion layer horizontal direction insulate each other.Drive electrode is parallel to the x axle, and is equidistant evenly distributed according to the y coordinate.During system works, each drive electrode begins to work successively, drives corresponding electroacoustic conversion layer and sends sound wave.When people's finger the time near screen, finger can produce disturbance near the alternating electric field it, the sound wave that the electroacoustic conversion layer is sent changes, be positioned at the acoustic-electrical transducer of screen edge, the sound wave of received variation and the multi-point touch panel Petting Area of system intialization in storer are not touched comparing with reference to waveform when taking place, thereby determine touch location.The different zone of y coordinate on the screen is by the electrode drive that is parallel to the x axle accordingly.In a work period of multi-point touch panel, each electrode work once drives corresponding electroacoustic conversion layer and sends sound wave.After the electrode working clearance should guarantee that sound wave that electroacoustic conversion layer that each electrode drives sends all arrives acoustic-electrical transducer, next electrode was just started working.
With Fig. 4 is example, and the electroacoustic conversion layer is divided into a plurality of zones by the different driving electrode by the y coordinate, narration touch-screen workflow.
Step 1: in a certain moment of multi-point touch panel work, under the driving of electrode, the electroacoustic conversion layer in H zone stopped after work a period of time, and working time length is the one-period of the sound wave that sends.
Step 2: after the sound wave that the electroacoustic conversion layer in H zone sends all arrived acoustic-electrical transducer, touch-screen system determined that according to the moment that sound wave arrives it is the Y coordinate figure that sound wave sends the zone.Start working the mistiming constantly by the sound wave moment that arrives and the drive electrode that sound wave sends the zone, determine each x coordinate figure of the pairing touch area point of sound wave constantly, obtain the pairing acoustic signals of this regional each point thus.Next electroacoustic conversion layer area begins to work under the driving of electrode.
Step 3:, determine upward pairing acoustic signals of each point of other each zone as the method for the acoustic signals of each point correspondence on step 1, the two definite H zones.
Step 4: by with screen on when not touching each regional sound wave compare, according to each point acoustic signals intensity of variation, obtain a corresponding with it figure.
Step 5: the figure that each zone is generated splices, and obtains the figure of whole screen.
Step 6: the figure to whole screen carries out noise reduction, obtains the figure behind the noise reduction.
Step 7: the figure to behind the noise reduction, discern by respective algorithms, determine each touch point coordinate.
Based on example one described multi-point touch panel, the method by adopting time period and frequency of sound wave to combine is equally divided into a plurality of groups with All Ranges, and each regional electroacoustic conversion layer sends the sound wave of the frequency that differs from one another in every group, works simultaneously.The acoustic signals that acoustic-electrical transducer is received carries out frequency separation, and every group of sound wave from a plurality of zones handled respectively, generates the distribution plan that each point on a plurality of zones sends acoustic signals, and response speed is significantly improved.The method that the different frequency sound wave is sent in a plurality of zones of electroacoustic conversion layer is to make the drive electrode in a plurality of zones send the pumping signal of different frequency.
Example two: followingly another embodiment of the present invention is discussed with reference to Fig. 3 and Fig. 1.
This example adopts the method for working time section to distinguish zones of different, as shown in Figure 1: the 5th, acoustic-electrical transducer.Fig. 3 is the touch area side view, wherein: the 6th, sealer, sealer is positioned at touch screen surface, is made by high-abrasive material, and its lower member is shielded.The 7th, last conductive layer, last conductive layer depends on the sealer, and is good by electric conductivity such as indium tin oxide or micrometer nickel films, and the made of certain ductility is arranged.The 8th, iknsulating liquid, its effect is to make the last conductive layer in the zone that touch does not take place and the insulation of electroacoustic conversion layer.The 9th, the electroacoustic conversion layer, its effect is to send the location acoustic signals, its horizontal direction insulation, vertical direction conduction.The 10th, drive electrode layer, its effect is to drive the electroacoustic conversion layer to send sound wave, drive electrode is parallel to the x direction of principal axis, evenly distributes along the y direction of principal axis, and is corresponding one by one with each area coordinate.The 11st, following laminar substrate, the electroacoustic conversion layer does not send sound wave not having to be in off state when contacting with last conductive layer, when taking place to touch, the pressure that touch produces is connected the electroacoustic conversion layer under conductive layer and the touch area, and the electroacoustic conversion layer of connection sends sound wave.In a work period, each works the drive electrode in the drive electrode layer once, and the electroacoustic conversion layer that drives its top sends sound wave.Working clearance between the electrode should guarantee that the sound wave that its electroacoustic conversion layer that drives sends all arrives acoustic-electrical transducer.Each stopped after electrode work a period of time, and working time length is sent the one-period of sound wave for the electroacoustic conversion layer that it drove.
With Fig. 1 is example, and its workflow is as follows:
Step 1: touch the pressure that produces the conductive layer of touch point A top is contacted with the electroacoustic conversion layer.
Step 2: in a work period of multi-point touch panel, each regional drive electrode is worked successively on the screen, and when the drive electrode of regional H was worked, the electroacoustic conversion layer at some A place sent sound wave.
Step 3: after the sound wave that the electroacoustic conversion layer in H zone sends all arrives acoustic-electrical transducer, the moment that touch-screen system arrives according to sound wave, determine that sound wave sends the zone, the mistiming in the moment of starting working by sound wave due in and respective regions electrode, determine the x coordinate of each electroacoustic conversion layer that sound wave is corresponding with it constantly, each puts pairing acoustic signals to obtain this zone thus.Next electroacoustic conversion layer begins to work under the driving of electrode.
Step 4:, determine that other zone goes up each electroacoustic conversion layer coordinate of sound wave correspondence constantly as step 1, step 2, method of work that step 3 is identical.
Step 5: frequency and the intensity of sending sound wave according to each point on the zone generate a figure, and the figure that each is regional splices, and obtains the figure in whole screen touch district.Each point is corresponding one by one with electroacoustic conversion layer each point on the figure, and each point comprises frequency of sound wave and the intensity that the point on the pairing electroacoustic conversion layer sends.
Step 6: the figure in resulting whole screen touch district is carried out noise reduction, carry out multiple spot identification after the noise reduction.
Some signal Processing and the correlation technique that the present invention relates to belong to mature technology well-known to those skilled in the art, are not described in detail.