CN102576274B - The touch-control monitoring method of capacitive character pointer - Google Patents
The touch-control monitoring method of capacitive character pointer Download PDFInfo
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- CN102576274B CN102576274B CN201180002768.7A CN201180002768A CN102576274B CN 102576274 B CN102576274 B CN 102576274B CN 201180002768 A CN201180002768 A CN 201180002768A CN 102576274 B CN102576274 B CN 102576274B
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Abstract
The present invention provides a kind of system including a senser element and a capacitive sensing array be configured the position set to follow the trail of a pointer and described capacitive sensing array is synchronized to pointer transmission signal.Described system is configured and sets to use self-capacitance sensing to follow the trail of the position of described pointer, and uses mutual capacitance sensing to follow the trail of the position of passive touch object.Described system is configured setting with modulation described pointer transmission signal further to comprise excessive data, to support extra touch-control pen function.
Description
Technical field
This case disclosure is related to the field of User's Interface device, and is more specifically related to capacitor sensor device
Part.
The cross reference of related application
Subject application is advocated within 22nd, to carry the U.S. Provisional Application case the 61/385th, 463 of Shen, foregoing teachings in JIUYUE in 2010
It is incorporated by reference herein in case.Subject application is related to the rule of entitled " have the palm and touch the capacitive character pointer of rejection "
The U. S. application case (the most not specified application number) that the common Shen that teacher's archives the CD10080th is examined, and entitled " use capacitive sensing
The pointer of array synchronization " lawyer's archives the CD10083rd common Shen examine U. S. application case (the most not specified application number),
Aforementioned all of content is incorporated by reference herein in case.
Background technology
Pointer is used in touch screen interface and is completely set up.The design of Touch Screen has been integrated and has been comprised electricity
Many different technologies of resistive array, capacitive array, inductive array, and RF sensing array.For tool example: resistive battle array
It is classified as and looks good with the passive type device that a passive type pointer uses.Original from mid-term nineteen ninetyDevice
Part is the commercial devices of first resistive Touch Screen successfully utilizing the pointer that is designed to arrange in pairs or groups to use, and
Contribute to making technique universalness.Although resistive Touch Screen can sense the input of substantially any object, but tap more
Control usually cannot be supported.One example of one multi-point touch application can be application this touch screen of two or more finger touch
Curtain.Another example can be the signature (signature) that input can comprise the input signal synchronizing palm and pointer.Due to
Aforementioned and other multiple unfavorable factor, capacitive character Touch Screen is little by little replacement resistive touch screen on consumer market
Curtain.
The mode of each germline refining formula active pointers has been carried out in Touch Screen, and can find to sell at such as end points
(point-to-sale) terminal (for example: be used in the signature plate of credit card trade in agency) and other open use
In many application on way.But, it is that the needs of refining cable are for such as personal computer, smart phone and the private of tablet PC
People should be used to say that an obvious shortcoming.
One block chart of Figure 1A is to illustrate for following the trail of a touch object on an inductive sensing array 107
The conventional embodiment of the host device 100 of position.Host device 100 comprises printed circuit board (PCB) (PCB) 105, the first match circuit
110, receptor 115, host Central Processing Unit (CPU) (CPU) 120, personal computer (PC) 125, conveyer 130, and the second coupling
Circuit 135.Printed circuit board (PCB) 105 is put (the most graphic) after being typically placed at a Touch Screen, and comprises inductive sensing battle array
Row 107.Inductive sensing array 107 comprises a succession of induction coil.Inductive sensing array typical case is upper is heavy and in manufacture
Expensive.
One block chart of Figure 1B is to illustrate to be used in for following the trail of a touch object an inductive sensing battle array
The conventional embodiment of the active pointers 150 of the system of the position on row 107.Active pointers 150 comprises micro controller unit
(MCU) 155, driver 160, and inducer erases device 165, and inducer nib 170, commutator 175, power regulator 180,
Button 185, dynamics nib 190, and dynamics are erased device 195.Inducer erases device 165 and inducer nib 170 is configured setting
On different pointer edges.
In operation, the inductive sensing array 107 on printed circuit board (PCB) 105 produces magnetic field to provide pointer power to produce
With both position of touch detections.About position of touch, the anti-coupling of match circuit 110 offer group and by pointer 150 from inductive
Sensing array 107 is couple to receptor 115.Receptor 115 and host Central Processing Unit (CPU) 120 receive and process simulation letter respectively
Number, to provide position of touch and dynamics data to personal computer 125.Dynamics data are in order to point out by the nib of pointer touching
The amount of pressure that control screen is provided.Host Central Processing Unit (CPU) 120 is based on each coil in inductive sensing array 107
Inducer signal intensity relatively calculates position of touch.More particularly, the existence of pointer 150 senses array based on inductive
The relative proximity of this pointer is changed for the respective inductor current of each coil by each coil in 107.
The pointer 150 position of touch on adjoint Touch Screen is taken approximation by maximum signal intensity.
Host Central Processing Unit (CPU) 120 via amplifier (not shown), conveyer 130, Impedance Wave match circuit 135, and
Inductive sensing array 107 is to send high-frequency carrier signal to pointer 150.Pointer 150 receives and utilizes high frequency carrier to believe
Number transmit for self-powered and data.In operation, pointer 150 rectification (commutator 175) and adjustment (power regulator 180)
This carrier signal, and the signal that feeding generates is to micro controller unit 155 and driver 160.Micro controller unit 155 measures power
Degree sensor (dynamics nib 190 and dynamics erase device 195) and button state (button 185), and will the data signal coupling of generation
Receive driver 160.Driver 160 drives inducer nib 170 and inducer to erase device 165, with by pointer 150 inductive
Be couple to inductive sensing array 107.
Described pointer 150 senses the main finger sensing function independent of Touch Screen and implements.As above-mentioned, touch-control
The tracking of pen needs to be produced an alternating current (AC) by inductive sensing array 107, and AC signal is inductively couple to touch-control
The nib of pen 150.Then, the inductive sensing array 107 being positioned at Touch Screen rear receives pointer signal, and host CPU
Processing unit 120 is based on received signal at each inductive sensor of inductive sensing array 107 relatively strong
Degree comes the position of interpolation pointer nib (inducer nib 170).Although inductive sensing can rely on, but inductive is touched
The tracking solution of control pen represents and comprises high power consumption, high electromagnetic interference (EMI), high cost of manufacture, and Chen Chong construction
Serious coml unfavorable factor.Furthermore, existing touch sensing (subject sensor of passive touch-control) is comprised independent
The transformation that pointer is followed the trail of will need extra printed circuit board (PCB) 105 layers, to include inductive sensing array 107 in.
One block chart of Fig. 2 A is the one of the host device 200 illustrating the position for following the trail of a touch object
Individual conventional embodiment.Described host device 200 comprises indium tin oxide (ITO) panel 205, a receptor 210, one
Data decoder 215, a host Central Processing Unit (CPU) 220, and a personal computer 225.In fig. 2b, described pointer
250 comprise a force sensor 255, a measurer 260, a manipulator 265, an amplifier 270, a pointer
Nib 275, and a reference clock 280.Described pointer 250 typical case is upper battery-powered (illustration).
In operation, described pointer 250 and couples from described pointer pen with generation, amplification via capacitive coupling
One signal of point 275 is to described indium tin oxide panel 205.Described indium tin oxide panel 205 act as an antenna, and as above
Literary composition receives the signal from described pointer 250 with reference to described in Fig. 2 B.Selectivity receptor 210 demodulates described signal, and couples
Position of touch No. one arrives described host Central Processing Unit (CPU) 220 and a dynamics data signal to described data decoder 215.Described
Data decoder 215 takes out dynamics data and is coupled to described host Central Processing Unit (CPU) 220.Described host CPU processes
Unit 220 relative maximum based on the pointer signal detected on the indium tin oxide circuit of indium tin oxide panel 205
Amplitude calculates the position of touch of pointer.Described host Central Processing Unit (CPU) 220 is based further on described dynamics data and comes certainly
Surely the dynamics of described pointer it is be applied to.Described host Central Processing Unit (CPU) 220 is controlled by described personal computer 225.
One block chart of Fig. 2 B is to illustrate to be used in for following the trail of a touch object at a RF sensing array
The conventional embodiment of active pointers of system of position.The measurer 260 of described pointer 255 measures and is passed by described dynamics
The dynamics that sensor 255 is sensed, and described manipulator 265 uses the carrier frequency that provided by described reference clock 280
The dynamics data that modulation generates.Described amplifier 270 amplifies modulated signal, and transmits from described pointer nib 275
Modulated carrier frequency.As described above, described main frame 200 is modulated carrier signal to be decoded, and transmits knot
Fruit is to described personal computer 225.Although the solution of a RF sensing array may be provided in the saving on this and a fall
Low component counting, but on described main frame 200, need specific narrow frequency receptor and by radio noise and the shadow of interference
Ring.As a result, the solution of conventional contact panel, in cost, usefulness, applicability, and reliability is likely to be of the most not
Profit factor.
Summary of the invention
The present invention discloses the apparatus and method that a pointer is synchronized to a capacitive sensing array.An enforcement
In example, described pointer is configured setting and " dominates " as sequential with running, and a touch control screen controller adjusts described electric capacity
The sexy sequential of array of surveying is with the sequential of coupling pointer when using described pointer.Described pointer is by pointer transmission
(TX) signal is capacitively coupled to described capacitive sensing array.Described touch control screen controller is configured setting equally with substantially
Upper one passive touch object (such as: a finger) of tracking and the position of described pointer simultaneously.An embodiment
In, described pointer is configured setting and transmits signal so that excessive data to be modulated described pointer, including but not limited to touching
The dynamics data of a control nib, the pushbutton data of pointer, the acceleration of pointer, and the battery data of pointer.A reality
Executing in example, described touch control screen controller is configured setting so that a transmission signal is sent to described capacitive sensing array
On row electrode, and receive the reception signal generated on the row electrode of described capacitive sensing array to follow the trail of a passive touch-control
Object position on described capacitive sensing array.In another embodiment, described touch control screen controller is configured and sets
Fixed to receive the pointer transmission signal being expert on electrode and row electrode.Should described it should be noted that: described Touch Screen control
Device processed can interchangeably utilize described row electrode and row electrode, transmits and receives for positioning and follow the trail of a passive touch-control pair
The transmission signal of the position of elephant and reception signal.
Accompanying drawing explanation
The present invention illustrates via the example of non-restrictive in each figure of rear accompanying drawings, wherein:
One block chart of Figure 1A is to illustrate for following the trail of touch object position on an inductive sensing array
One conventional embodiment of the host device put；
One block chart of Figure 1B is to illustrate to be used in for following the trail of a pointer at an inductive sensing array
On the conventional embodiment of an active pointers of a system of position；
One block chart of Fig. 2 A is that illustration is for following the trail of the one of touch object position on a radio frequency sense array
One conventional embodiment of individual host device；
One block chart of Fig. 2 B is to illustrate to be used in for following the trail of a pointer on a RF sensing array
One conventional embodiment of one active pointers of one system of position；
One block chart of Fig. 3 is to illustrate to have for one touch object of detection and the one of an existence of a pointer
One embodiment of one electronic system of individual processing apparatus；
One block chart of Fig. 4 is to illustrate to comprise a N and take advantage of the electrode matrix of M and the electric capacity for converted measurement to become tactile
One embodiment of one capacitance sensing array of one capacitance sensor of control coordinate；
One view of Fig. 5 A is a side of the mutual capacitive sensing array illustrating one all points addressable of scanning
One embodiment of method；
One view of Fig. 5 B is a side of the mutual capacitive sensing array illustrating one all points addressable of scanning
One embodiment of method；
One block chart of Fig. 6 A is that illustration comprises a capacitive sensing array and the electric capacity for converted measurement becomes
One embodiment of one system of one touch control screen controller of touch-control coordinate；
One block chart of Fig. 6 B is to illustrate to comprise a capacitive sensing array, a pointer, and is used for amount of translation
The electric capacity surveyed becomes an embodiment of a system of a touch control screen controller of touch-control coordinate；
One block chart of Fig. 7 A is the embodiment illustrating the pointer comprising a conduction and cut-off switch；
One block chart of Fig. 7 B is to illustrate the pointer comprising a capacitive sensing assembly to detect when to make
By an embodiment of described pointer；
One block chart of Fig. 7 C is to illustrate the pointer comprising a pointer nib with multiple function
One embodiment；
One block chart of Fig. 8 is the embodiment illustrating a pointer；
It is described for occurring in without touch object that one sequential chart of Fig. 9 is based on one embodiment of the present of invention
A mutual capacitance touching control screen system on Touch Screen；
One sequential chart of Figure 10 is based on one embodiment of the present of invention and points out presently described touching on the other hand for wherein having
A mutual capacitance touching control screen system on control screen；
One sequential chart of Figure 11 is based on one embodiment of the present of invention for wherein there being a pointer to occur in institute
State the mutual capacitance touching control screen system of on Touch Screen；
One sequential chart of Figure 12 is based on one embodiment of the present of invention for wherein having a finger and a touch-control
Pen occurs in the mutual capacitance touching control screen system of on described Touch Screen；
One flow chart of Figure 13 is a method of a detection pointer on a capacitive sensing array
One embodiment.
Detailed description of the invention
The present invention discloses the apparatus and method that a pointer is synchronized to a capacitive sensing array.An enforcement
In example, described pointer is configured setting and " dominates " as sequential with running, and a touch control screen controller adjusts described electric capacity
The sexy sequential of array of surveying is with the sequential of coupling pointer when using described pointer.Described pointer is by pointer transmission
(TX) signal is capacitively coupled to described capacitive sensing array.Described touch control screen controller is configured setting equally with substantially
Upper one passive touch object (such as: a finger) of tracking and the position of described pointer simultaneously.An embodiment
In, described pointer is configured setting and transmits signal so that excessive data to be modulated described pointer, including but not limited to touching
The dynamics data of a control nib, the pushbutton data of pointer, the acceleration of pointer, and the battery data of pointer.A reality
Executing in example, described touch control screen controller is configured setting so that a transmission signal is sent to described capacitive sensing array
On row electrode, and receive the reception signal generated on the row electrode of described capacitive sensing array to follow the trail of a passive touch-control
Object position on described capacitive sensing array.In another embodiment, described touch control screen controller is configured and sets
Fixed to receive the pointer transmission signal being expert on electrode and row electrode.Should described it should be noted that: described Touch Screen control
Device processed can interchangeably utilize described row electrode and row electrode, transmits and receives for positioning and follow the trail of a passive touch-control pair
The transmission signal of the position of elephant and reception signal.
In described below, mention that for task of explanation the one of the present invention is understood by multiple detail to provide comprehensively.
But, to understanding the technology personage by obvious: the present invention can carry out implementation in the way of not having more described detail.
In other example, it is thus well known that circuit, structure, and technology do not shows with detail, but show in block chart mode
Show to avoid unnecessarily hindering the understanding that this is illustrated.
" embodiment " censured in description or " embodiment " mean coordinate described in described embodiment specific
Characteristic, structure, or feature are comprised at least one embodiment of the present invention.Position word in the various places of this description
Identical embodiment may not be censured in language " in one embodiment ".
One block chart of Fig. 3 is to illustrate to have to deposit for the one of one touch object 340 of detection and a pointer 330
The embodiment of an electronic system 300 of a processing apparatus 310.Electronic system 300 comprises processing apparatus 310,
Touch Screen 325, touch-control sensing plate 320, pointer 330, host-processor 350, embedded controller 360, and noncapacitive sense
Survey assembly 370.In the embodiments described, described electronic system 300 comprises and is coupled to described processor via bus 322
The described Touch Screen 325 of part 310.Touch Screen 325 can comprise the capacitive sensing array of various dimensions.Described various dimensions
Sensing array comprise multiple sensing component carrying out with row and column and organizing.In another embodiment, described Touch Screen 325 is grasped
It is made the mutual capacitive sensing array of an all points addressable (APA), as described for Fig. 4.In another embodiment,
Described Touch Screen 325 operates into an electric charge and couples receptor, as described for Fig. 4.
It is used for detecting and follow the trail of described touch object 340 and described touch-control with detailed narration hereinafter with reference to Fig. 4 to 6B
The described processing apparatus 310 of pen 330 and the operation of described Touch Screen 325 and configuration and setting.In short, described processing apparatus
310 are configured setting to detect the existence on described Touch Screen 325 of the described pointer 330, and described touch object
One existence of 340.Described processing apparatus 310 can detect and follow the trail of described pointer 330 He on described Touch Screen 325 respectively
Described touch-control object 340.In one embodiment, described processing apparatus 310 can on described Touch Screen 325 simultaneously detection and
Follow the trail of both described pointer 330 and described touch object 340.In one embodiment, described pointer 330 is configured setting
" dominate " operating into sequential, and described processing apparatus 310 adjusts described Touch Screen 325 when described pointer 330 uses
Sequential with mate described pointer 330 sequential.As described herein, compared to conventional inductive stylus applications, institute
State Touch Screen 325 and described pointer 330 capacitive coupling.Equally should described it should be noted that: be used in configuration and setting with inspection
The same components surveying touch object 340 is used to detection equally and follows the trail of described pointer 330, without the most known for electricity
Perception follows the trail of the extra layer printed circuit board that described pointer 330 is completed.
In the embodiments described, described processing apparatus 310 comprises emulation and/or the universal input/output of numeral
(GIPO) port 307.General input/output port 307 can be programmed.General input/output port 307 can be coupled to one
Individual interconnection able to programme and logic (PIL), described interconnection able to programme and logic are in the universal input/output of described processing apparatus 310
A cross tie part (not shown) is served as between port 307 and a digital square array.Described numeral square array can be through group
State sets to use the user module (UM) of multiple configurable setting to implement various Digital Logic in one embodiment
Circuit (such as: D/A converter, digital filter, or numerical control system).Described numeral square array can be coupled to one
Individual system bus.Processing apparatus 310 equally comprises such as random access memory (RAM) 305 and weaves into flash memory
The memorizer of 304.Random access memory 305 can be static random access memory (SRAM) 305, and weaves into flash memory
Reservoir 304 can be a non-volatile memorizer, can be used to store firmware (such as: can be performed by processing core 302
Control algolithm to implement computing described herein).Described processing apparatus 310 equally comprises one and is coupled to deposit
The Memory Controller unit (MCU) 303 of reservoir and described process core 302.
Described processing apparatus 310 equally comprises simulation square array (not shown).Described simulation square array
It is coupled to described system bus equally.Described simulation square array is equally configured setting to make in one embodiment
Various artificial circuit is implemented (such as: A/D converter, or analog filtering by the user module of multiple configurable settings
Device).Described simulation square array is equally coupled to described general input/output port 307.
As exemplified, in capacitance sensor 310 can be integrated into processing apparatus 310.Capacitance sensor 310 can comprise
For being coupled to a such as touch sensing plate 320, Touch Screen 325, touch sensing sliding part (non-icon), touch-control passes
Sensor button (non-icon), and/or the simulation input/input of the external member of other device.Describe in more detail below
Capacitance sensor 310 and processing apparatus 310.
In one embodiment, described electronic system 300 comprises one and is couple to described processing apparatus via bus 321
The touch sensing plate 320 of 310.Touch sensing plate 320 can comprise the capacitive sensing array of various dimensions.Described many
The sensing array of dimension is multiple sensing components carrying out with row and column and organizing.In another embodiment, described touch sensing
Plate 320 is the mutual capacitive sensing array of an all points addressable, as described for Fig. 4.In another embodiment, institute
State touch sensing plate 320 to operate into an electric charge and couple receptor, as described for Fig. 4.
In one embodiment, described electronic system 300 equally comprises via bus 371 and universal input/outfan
Mouth 307 is couple to multiple noncapacitive sensing components 370 of described processing apparatus 310.Described noncapacitive sensing component 370 is permissible
Comprise multiple button, multiple light emitting diodes (LED), and a such as mouse, a keyboard, or need not capacitance sensing ground its
Other user interface devices of its function key.In one embodiment, bus 321,322, and 371 implement with unified bus.
Another or, more described bus can be configured in any combination being set to one or more bus out of the ordinary.
Processing apparatus 310 can comprise agitator/clock 306 and the communication square (COM) 308 of inside.Implement at another
In example, described processing apparatus 310 comprises a spread spectrum clock (not shown).Described agitator/clock 306 provides multiple clock to believe
Number to the one or more components of described processing apparatus 310.Described communication square 308 can be used to via HPI (I/
F) circuit 351 is to carry out communication with such as one, host-processor 350 ground external member.Another or, process square 310 with
Sample can be coupled to embedded controller 360 and carry out communication with the external member with main frame 350.In one embodiment, institute
State processing apparatus 310 be configured setting with described embedded controller 360 or described main frame 350 carry out communication send and/
Or reception data.
Processing apparatus 310 can be located in the crystal grain substrate of the most such as one integrated circuit (IC), a multi-chip
In module substrate, or a common carrier substrate of similar substrate.Another or, multiple components of processing apparatus 310 can be one
Or more other integrated circuit and/or discrete elements.In an exemplary embodiment, processing apparatus 310 be one by
Programmable system on the chip that Cypress Semiconductor Corp. of California san jose is developed () processing apparatus.Separately
Or, processing apparatus 310 can be other processing apparatus that one or more understanding described item skilled worker knows, such as one
Microcontroller or CPU, a controller, special purpose processors, digital signal processor (DSP), one specific
Application integrated circuit (ASIC), field programmable lock array (FPGA), or similar device.
Equally should described it should be noted that: embodiments described herein is not constrained to one and has a processing apparatus
Through being couple to a configuration and setting of a main frame, but one can be comprised and the electric capacity on senser element is measured and sends out
Send metadata to the system of a master computer, wherein remove at described master computer and performed an analysis by an application software.In effect,
The process completed by described processing apparatus 310 equally completes in described main frame.
Capacitance sensor 301 can be integrated in the integrated circuit of described processing apparatus 310, or additionally in a separation
In integrated circuit.Another or, the narration of capacitance sensor 301 can be generated and compile for the integrated circuit including other in
In.Such as: one can be used in order to describe the behavior level code of a part for capacitance sensor 301 or capacitance sensor 301
The hardware description language of individual such as VHDL or Verilog produces, and is stored in a machinery and can access medium (such as: only
Reading type optical storage media, hard disk, floppy disk etc.).Furthermore, described behavior level code can be compiled to depositor transfer level
(RTL) code, an online table, or even one circuit layout, and be stored in a machinery and can access medium.Described
Behavior level code, described depositor transfer level code, described online table, and described circuit layout all present abstract conception
Various levels are to describe capacitance sensor 301.
Should described it should be noted that: multiple components of electronic system 300 can comprise all aforementioned components mentioned above.Separately
Or, electronic system 300 can only comprise some components in all aforementioned components mentioned above.
In one embodiment, during described electronic system 300 is used in a tablet PC.Another or, described electricity
Sub-device can be used in other application, a such as notebook computer, a mobile phone, personal data assistant
(PDA), a keyboard, a television set, a Remote control, a monitor, a hand-held multimedium device, one
Hand-hold medium (audio frequency and/or video) player, a handheld games device, a signature for end points sales transactions
Entering apparatus, and an E-book reader, global positioning system (GPS) or a panel.Embodiments described herein
It is not limited to Touch Screen or the touch sensing plate of the embodiment for notebook computer, but can be used in
The embodiment of other capacitive sensing, such as: described senser element can be a touch sensing sliding part (not shown)
Or touch sensing button (such as: capacitance sensing button).In one embodiment, more described senser element comprises one or more
Multisensor.Operation specifically described herein is not limited to the pointer operation of desktop, but can comprise and such as illuminate control
System (dimmer), volume controls, and figure etc. is changed and controlled, speed controlling, or needs other control behaviour of progressive or discrete adjustment
Make.Equally should described it should be noted that: the more described embodiment of the embodiment of capacitive sensing can coordinate noncapacitive sexuality to survey
Assembly uses, including but not limited to choosing button, and sliding part (such as: the brightness of display device and contrast), roller, multimedium control
System (such as: volume, track advance etc.), handwriting recognition, and numeric keypad operation.
One block chart of Fig. 4 is to illustrate to comprise a N and take advantage of the electrode matrix 425 of M to become with the electric capacity for converted measurement
An embodiment of a capacitive sensing array 400 for the capacitance sensor 301 of touch-control coordinate.Described capacitive sensing battle array
Row 400 can the Touch Screen 325 of e.g. Fig. 3 or touch sensing plate.Described N takes advantage of the electrode matrix 425 of M to comprise N and takes advantage of M
Electrode (N number of reception electrode and M carry electrode), it comprises transmission (TX) electrode 422 further and receives (RX) electrode 423.
Each electrode in described N takes advantage of the electrode matrix 425 of M is connected by a conductive trace in a plurality of conductive trace 450
Receive described capacitance sensor 301.In one embodiment, capacitance sensor 301 uses a charge accumulation circuit, an electricity
Hold modulation circuit, or understanding technique personage other method for sensing known operates.In one embodiment, described electricity
Hold the sensor 301 touch control screen controller from Sai Pulasi TMA-3xx type family.Another or, other capacitance sensor
Can be used.The mutual capacitance sensing array described above, or Touch Screen can comprise one and be arranged at one and regard
Feel on display device itself (such as: LCD monitor) or a square in front of the display transparent substrate, in, or lower section is transparent
Tool conductivity sensing array.In one embodiment, described carry electrode and reception electrode carry out configuration and setting with row and column respectively.
Equally should described it should be noted that: the row and column of described electrode can by described capacitance sensor 301 with any selected combination by group
State is set to carry electrode and receives electrode.In one embodiment, the carry electrode of described sensing array 400 and reception electrode
Be configured setting with operate into mutual capacitance sensing array carry electrode in a first mode and receive electrode with
Detection touch object, and operate into an electric charge couple receptor electrode in second pattern with detection at described sensing
Pointer in the identical electrodes of array.The described pointer producing a pointer transmission signal upon start up is used to couple
Electric charge is to described capacitive sensing array rather than measures a reception electrode and a carry electrode (sensing component)
A phase mutual capacitance of a staggered place, as completed during mutual capacitance sensing.Described capacitance sensor 301 is not
Use phase mutual capacitance or self-capacitance sensing, to measure the described sensing component electric capacity when carrying out a pointer scanning.Otherwise,
Described capacitance sensor 301 measures one by capacitive coupling between described sensing array 400 and pointer specifically described herein
Electric charge.
Carry electrode in described N takes advantage of the electrode matrix 425 of M and reception electrode are through orthogonal configuration so that each
Described carry electrode interlocks and each described reception electrode that overlaps.Therefore, each described carry electrode capacitive coupling in
Each described reception electrode.Such as: the described the most described carry electrode of carry electrode 422 422 and described reception electrode 423
At the point overlapped, capacitive coupling is in described reception electrode 423.Each described carry electrode 422 and each described reception electricity
Pole 423 be staggered to form a capacitive sensing assembly.
Because the capacitive coupling between described carry electrode and described reception electrode, so one is transmitted signal often
Applying at one carry electrode induces an electric current at each reception electrode.Such as: transmit signal when applying one
During to carry electrode 422, described transmission signal induces one on the reception electrode 423 in described N takes advantage of the electrode matrix 425 of M
Individual reception signal.Then, by using a multiplexer that each in described N number of reception electrode is received electrode by suitable
Sequence is connected to the reception signal that a demodulation circuit measures in order on reception electrode each described.Can be by choosing
Each combination that can take selecting carry electrode and reception electrode senses and receives electrode with a carry electrode and one
Between each staggered electric capacity being associated.
When a touch-control object of such as a finger or pointer takes advantage of the electrode matrix 425 of M close to described N, described
Object causes the minimizing on electric capacity only to affect some electrodes.Such as: if putting a finger with close to carry electrode 422
With interlocking of reception electrode 423, the existence minimizing of the most described finger coupling capacitance between said two electrode 422 and 423.
In another embodiment, the existence of described finger increases the coupling capacitance between said two electrode 422 and 423.Therefore, may be used
There is coupling of minimizing by identification between described reception electrode and the described carry electrode being applied with described transmission signal
Both the electric capacity measuring described minimizing when of receiving electrode on described reception electrode of electric capacity, judges that described finger exists
Place on described touch pad.Therefore, by judging in order and each electrode in described N takes advantage of the electrode matrix 425 of M
The staggered place being associated, it is possible to determine that the place of one or more inputs.Should described it should be noted that: this process can be by sentencing
Surely described sensing component (receiving the staggered of electrode and carry electrode) is calibrated for the baseline of each described sensing component.With
Sample should described it should be noted that: interpolation can be used to the most preferably resolve the position detecting finger than row/column spacing, as right
Technique has usual knowledge personage it will be appreciated that this disclosure is had advantage.Additionally, various forms of centroid algorithms
Can be used to detect the center of described touch-control, as to technique has usual knowledge personage it will be appreciated that to this disclosure
There is advantage.
In other words, sensing is by following and reach: applying the every a line transmitting a signal to carry electrode successively has
One short time cycle, and during this cycle, sense the described row from carry electrode and be couple to receive every string of electrode
The quantity of electric charge.In one embodiment, it is couple to receive the electric charge of electrode with an a line from carry electrode in each staggered place
Mode measure, (as shown in Figure 5 A) reflects figure until whole screen has been set up one of quantity of electric charge measured value.
In other embodiments, if there is quantity as shown in Figure 5 B to exceed the row of the sensing channel that can take, then every a line may
Need to be driven twice and multiplex follow-up.Other change of scanning pattern generally can be known as having in technique
Know personage it will be appreciated that as used.Furthermore, understand the technology personage and it will appreciate that: induction current waveform is in order to point out one
The conversion of the position of touch coordinate of an input position on a touch sensing plate.
Although described carry electrode 422 and described reception electrode 423 present the rectangle of strip or elongation, portion in the diagram
Crossing substituting embodiment and can use various tessellated shape, such as rhombus, plagioclase is square, palindrome shape, and to this
Technology has usual knowledge personage it will be appreciated that other applicable shapes advantageous to this disclosure.
One block chart of Fig. 6 A is that illustration one comprises described sensing array 400 and the electric capacity for converted measurement becomes
One embodiment of the system 600 of the touch control screen controller 605 of touch-control coordinate.In one embodiment, described Touch Screen control
Device 605 processed is similar to the capacitance sensor 301 described above.In another embodiment, described touch control screen controller 605 is
Described processing apparatus 310.Described sensing array 400 comprises transmission lines 635 and receives circuit 640.In one embodiment, described
Transmission lines 635 and described reception circuit 640 are the carry electrode 422 in Fig. 4 respectively and receive electrode 423.Described touch screen
Curtain controller 605 comprises a transmission drive circuit 610, a reception sensing circuit 620, and a multiplexer 630.
In one embodiment, a passive object (such as: a finger or other conductivity object) is at contact point 645
Array 400 is sensed described in touch-control.Described transmission drive circuit 610 uses described transmission signal 632 to drive described transmission lines
635.Described reception sensing circuit 620 measures the reception signal 634 on described reception circuit 640.In one embodiment, described
The diagram technology that reflects that touch control screen controller 605 is described based on the Fig. 4 to 5 that arranges in pairs or groups above judges the place of described contact point 645.
Described transmission lines 635 and described reception circuit 640 are multiplexed by multiplexer 630.Described Touch Screen controls
Device 605 is at described transmission lines 635 (OK) the described transmission signal 632 of upper offer, and measures on described reception circuit 640 (arranging)
Electric capacity couple.In one embodiment, described transmission lines 635 and described reception circuit 640 are orthogonal, and can be interchangeably
Use (such as: be expert at upper transmission and reception on row).In one embodiment, described transmission drive circuit 610 is high through one
The indium tin oxide panel (described transmission lines 635) of impedance transmits described transmission signal 632, thus limits described system
Upper frequencies boundary and speed.Total scanning time equally depends on transmission lines 635 He described in described sensing array 400
The number of described reception circuit 640.Such as: according to an embodiment, described transmission drive circuit 610 is each transmission lines
There is provided one to transmit signal 632 on 635, and read, on each reception circuit 640, the acceptance letter coupled through electric capacity simultaneously
Numbers 634.In another embodiment, as coordinated Fig. 5 B to describe, described reception circuit 640 is multiplexed in two or more and sweeps
In retouching.
One block chart of Fig. 6 B is to illustrate one to comprise described sensing array 400, a pointer 680, and is used for turning
Change the embodiment of system 600 that the electric capacity of measurement becomes the touch control screen controller 605 of touch-control coordinate.Described sensing array
400 comprise reception circuit 640 and 660.Described reception circuit 660 is similar to the transmission lines 635 in Fig. 6 A, but is used as
Channel is received, so that signal sensing for pointer is such as described further in described system 600.Implement one
In example, receive circuit 640 and 660 and be similar to the carry electrode 422 of Fig. 4 and receive electrode 423.Described touch control screen controller
605 comprise described transmission drive circuit 610, described reception sensing circuit 620, and described multiplexer 630.Described pointer
680 comprise a transmission drive circuit 685 and a pointer nib 688.
In one embodiment, the transmission drive circuit 685 of described pointer 680 will connect provides a transmission signal 677
Contact point 695 on described sensing array 400, thus eliminate and make the described reception circuit 660 (transmission lines in previous Fig. 6 A
635) transmission one needs transmitting signal from described transmission drive circuit 685 it are exclusively used in.With regard to itself, described reception is felt
Slowdown monitoring circuit 620 measures the reception signal on both the row (receive circuit 660) of described sensing array and row (receiving circuit 640)
634.So no longer in turn result in position faster by the indium tin oxide circuit of described high impedance due to described transmission signal
Put tracking, thus reduce total sweep time receiving and measuring.In one embodiment, described touch control screen controller 605 exists
Carry out described sensing array 400 during transmission signal from described transmission drive circuit 610 is received sensing one
Normal scan (illustrated in Fig. 6 A), and carry out described sense described pointer is transmitted during signal 677 is received sensing
Survey a pointer scanning (illustrated in Fig. 6 B) of array 400.For described pointer scans, described Touch Screen control
Device 605 processed measures an electric charge from described pointer, and described electric charge is couple to the row electrode of described sensing array by electric capacity
With row electrode.For further illustrating, a phase mutual capacitance scanning uses one to transmit signal 632 and a reception signal 634 liang
Person is to follow the trail of an object.As discussed above, so typically via described touch control screen controller 605 to each driving
Transmission lines 635 scan described reception circuit 640 with continuation mode and complete.Arrange at N row (transmission signal) and M and (connect
Collect mail number) an array in, if single pass one receives circuit, then needs N is taken advantage of M always to sweep by complete scan
Retouch.Such as: be expert on 1 and transmit one and transmit signal (TX ' ing) and on row 1-M, receive one receive signal (RX ' ing), after
With the TX ' ing being expert on the 2 and RX ' ing on row 1-M, and mode goes in order.Another or, can be with single pass
More a plurality of reception circuit.Single pass 4 or 8 reception circuits in one embodiment, but in other embodiments can be same
Time or scan all of reception circuit in order.Along with multiple reception channels sense the reception line more than in the same time
Road, complete scan will be (N*M)/(receiving the number of channel).For comparing, a pointer scanning does not need described transmission
One of drive circuit 610 transmits signal, and a complete scan would only need to the single reception in every a line and every string
Measuring signal or N+M scanning, compared to for for the mutual capacitance sensing time of whole sensing array, thus to
Significantly reduced pointer sweep time is caused in whole sensing array.As above, multiple reception channels are with for the moment
Between can be used to sense multiple reception circuit.In this case, described complete scan will be (N+M)/(number of reception channel
Mesh).
Should described it should be noted that: embodiment described herein can use identical electrode (such as: indium tin oxide
The circuit of panel), wherein service can be used in connecing of described pointer sensing for the transmission effect of described touch-control sensing
Adduction.Equally should described it should be noted that: pointer and both operations of finger sensing are not being declined significantly by described senser element
At the frequency subtracted (such as: indium tin oxide panel).
As discussed above, a passive pointer can be normally used as a touch object, with interface in institute above
The various Touch Screens of narration.Compared to passive pointer, a pointer described herein provides typically via institute
State the touch control screen controller 605 transmission (TX) signal provided in finger sensing modes, such as Fig. 6 A and 6B institute of arranging in pairs or groups above
Narration.Described pointer is used to be couple to electric charge described capacitive sensing array, and the running of described capacitive sensing array
It is that an electric charge couples receptor to detect described pointer.When running couples receptor for described electric charge, described capacitive character
Sensing array does not use mutual capacitance sensing or self capacitive sensing.Identical capacitive sensing array is in detection touch object
Time can such as use mutual capacitance sensing with running in a different mode.
Described pointer transmission signal 677 is capacitively coupled to described sensing array 400, as above by described pointer 680
Literary composition collocation Fig. 4 is described to 6.In one embodiment, the amplitude of described pointer signal, frequency, phase place etc. can be identical
Or it is similar to be used in the signal amplitude of finger sensing, frequency, phase place etc. by described touch control screen controller 605.Another or
Person, described pointer transmits signal and can be differently configured from amplitude, frequency, and phase place from described transmission drive circuit 610
Transmit signal.In another embodiment, the code for code modulated that described pointer transmission signal is had is permissible
It is different from one and is used in the code transmitted in signal from described transmission drive circuit 610.In an one exemplary embodiment
In, the amplitude that described pointer transmission signal 677 is had is more than carrying out finger sense from described transmission drive circuit 610
The transmission signal 632 surveyed.Such as: in an exemplary embodiment, carried compared to by described touch control screen controller 605
The about typical case of confession is 5 to 10 volts, and it is then to have scope from about 20 to 50 volts that described pointer transmits signal 677.Another or,
Other voltage can be used, as technique has usual knowledge personage it will be appreciated that.Higher pointer transmits voltage more
Couple more charge rapidly to MC array 400, thus needed for reducing every a line and the every string sensing described sensing array 400
Time quantum.Other embodiments can include high voltage in the transmission lines 635 of described MC array, is similar to hands to obtain
Refer to that the time effect of sensing is improved.
In another embodiment, described pointer 680 transmits in described pointer and applies a ratio on signal 677 from institute
State the frequency that the frequency of the transmission signal 632 transmitting drive circuit 610 is the highest, to reach the sensing time reduced.Electric charge
Can be capacitively coupled to from described pointer 680 during the rising edge of described pointer transmission signal 677 and falling edge
Described sensing array 400.Therefore, a higher transmission frequency one give provide on time cycle of ordering substantial amounts of rising edge and under
Fall edge, to cause bigger electric charge to couple.Described transmission frequency is at finger sensing modes (such as: for hands on sensing array
Refer to the transmission signal of sensing) in actual upper bound depend on respective sense assembly and the electricity of cross tie part (not shown) of described panel
The time constant of resistance device-capacitor (RC).So typically due to height used in the making of described sensing array 100
Impedance material (such as: indium tin oxide).The sensing array 400 of one high impedance can cause a high time constant and make
Become row (transmission lines 635) and the signal attenuation of row (receiving circuit 640) of sensor, and the sensing frequency of maximum can be limited
Rate.When using an active pointers to be transferred directly on described sensing array 400 by described pointer transmission signal 677
During one contact point, it is unnecessary by all of high impedance route that described pointer transmits signal 677, and therefore can increase use
Transmit the maximum operation frequency of signal 677 in described pointer, as arranged in pairs or groups above, Fig. 6 A and 6B describes.Such as: described reception
The time constant of trace (both row and columns) can be used to judge that a upper frequencies limits, just so-so the most near
Double the upper frequencies used in finger sensing less to limit.It is because eliminating the impedance of described row on typical case and keeps described
The impedance (or the opposite is also true is such) of row, so described impedance is the half impedance when carrying out phase mutual capacitance scanning.Answer institute
State it should be noted that: finger sensing and pointer sensing both use frequencies selects, the operation cycle therein should described in be less than institute
State the time constant of panel, so almost with finger sensing and pointer, phase is sensed for the restriction that described operation frequency is selected
With.
In one embodiment, the frequency of described pointer transmission signal 677 is different from the transmission letter of described finger sensing
The frequency of numbers 632.By using different transmission frequencies, described touch control screen controller 605 can transmit signal in pointer
Catch cropping with the transmission signal of finger sensing is distinguished.Another or, described touch control screen controller 605 can use (to this skill
Art having usual knowledge personage it will be appreciated that advantageous to this disclosure) other technologies to be to distinguish described pointer transmission
Signal and the transmission signal 632 of described transmission drive circuit 610, such as detect signal characteristic (such as: phase place, frequency, shake
Width, and code modulated) in difference.
In one embodiment, described pointer transmission signal 677 is encoded to comprise and treats by described by described pointer 680
The excessive data that touch control screen controller 655 is used.This extraneous information can be used for from described pointer 680 for user
Obtain additional functionality.Such as: extraneous information may be embodied in additional buttons, sliding part, or other behaviour in described pointer 680
The control piece that author activates.Described pushbutton data can be electrically (such as: button, potentiometer), inductive, or capacitive character.?
In one embodiment, sensed by described pointer 680 inspecting force or described pointer nib 688 presses against described touching
Pressure used on control screen or sensing array 400, and coding is in described pointer transmits signal 677.Can be by institute
State the interior passive sensor of pointer 680 (such as: dynamics sense resistor or capacitor) or active sensor (such as: electricity
Capacitive linear position sensor or a moving assembly of a relative coil) detect a dynamics.Furthermore, can detect
The orientation of (such as: by an accelerometer) described pointer or acceleration, and it is encoded to described pointer transmission signal 677
In for the superior function of described pointer 680.This data message can be sent to from described pointer 680 in every way
State touch control controller 605, and be not restricted to modulate described pointer transmission signal 677.Such as: the dynamics of described nib can be by
It is used for changing the live width in a mapping program, is the most contacting described screen detecting described pointer 680, or detection
Such as one " touching (tap) gesture " or " double touch " gesture, or the gesture of similar movement.
In one embodiment, described pointer 680 uses modulation to encode described pointer transmission with described excessive data
Signal 677.This modulates and can comprise frequency modulation(PFM) (FM), frequency shift keying (FSK), Modulation and Amplitude Modulation (AM), amplitude shift keying (ASK),
On-off keying (OOK), pulse position modulation, phase-modulation (PM), Manchester's code, Direct Sequence Spread Spectrum (DSSS), or
Be as technique has usual knowledge personage it will be appreciated that other modulator approach.Phase-modulation can comprise two further and enter
Phase-shift keying (PSK) processed (BPSK) or the coded method of QPSK (QPSK).
Alternate embodiment can be implemented so that excessive data is transferred to the control of described Touch Screen from described pointer 680
Device 605, to replace the modulation of described pointer transmission signal 677.In one embodiment, described pointer 680 separately transmits
Described excessive data and described pointer transmit signal 677, but use and identical be capacitively coupled to described sensing array
400.Such as: in time division multiplexing (TDM), described pointer 680 transmits described pointer in a time slot and transmits letter
Numbers 677, and in another time slot, transmit described excessive data (such as: dynamics data, accelerating data).An embodiment
In, described pointer transmits signal 677 and described excessive data utilizes identical frequency or different frequencies.Real at another
Executing in example, described pointer transmits signal 677 and described excessive data utilizes the one or more modulator approach previously described.
In yet another embodiment, optics, ultrasound wave, inductive, or radio signal transmission can be used to described excessive data
Described touch control screen controller 655 is transferred to from described pointer 680.Should described it should be noted that: transmitting described excessive data
The additional hardware of such as antenna and/or amplifier may be needed on separate communication link.
In one embodiment, in order to want power consumption and the maximization battery life of pointer 680 described in minimization, remove
Non-in contact or near described sensing array 400, the most described pointer 680 will not produce or transmit pointer and transmit signal
677.In one embodiment, user operates a conduction and cut-off switch 705 and transmits signal 677 with initial described pointer
Generation.One block chart of Fig. 7 A is the reality illustrating the pointer 700 comprising a conduction and cut-off switch 705
Execute example.In one embodiment, described conduction and cut-off switch 705 can be an actuator, and described actuator is configured setting
With by pressing, rotate, or slide and be activated.Described conduction and cut-off switch 705 can be a mechanical type, electrically, or this
Item technology has the hand switch of other form known known to usual knowledge personage.
One block chart of Fig. 7 B is to illustrate the pointer 720 comprising a capacitive sensing assembly 730 with detection
When use an embodiment of described pointer.In one embodiment, described pointer 720 comprises and is similar to above join
Examine described for Fig. 7 A conduction and cut-off switch 725.Described conduction and cut-off switch 725 is combined with a sleep pattern.
Described sleep pattern is a low-power mode, and wherein said pointer 720 uses a small amount of power to detect described pointer 720
The most just used by a user.Such as: a user is by pressing described conduction and cut-off switch 725 to turn on institute
State pointer 720, and described pointer 720 initiates a pointer and transmits the transmission of signal 677.Make a reservation for not used
After cycle, described pointer 720 enters a low power state (sleep pattern), and stops described pointer transmission signal
The transmission of 677.Described pointer 720 is maintained in described low power state, until examining on described capacitive sensing assembly 730
Till measuring a touch object (such as: finger, hands etc.).In one embodiment, described pointer 720 is periodically measured
Survey electric capacity on described capacitive sensing assembly 730 and use (such as: every 250 milliseconds once) with detection；But, detect the cycle
Or dutycycle can optionally make configuration and setting.When a touch object being detected, described pointer 720 initiates described touch-control
Pen transmit signal 677 transmission, until described predetermined period passage or described user via described conduction and cut-off switch 725 with
Till ending described pointer 720.In another embodiment, described pointer 720 is in being in described low power state
One predetermined period has been passed and has been ended afterwards.
One block chart of Fig. 7 C is to illustrate the pointer comprising a pointer nib 745 with multiple function
One embodiment of 740.In one embodiment, described pointer nib 745 is configured setting to contact described sense carrying out
Sensing mechanical pressure (such as: dynamics data) when surveying array 400 or Touch Screen (not shown).Described pointer 740 can be through group
State sets to use " dynamics of reviving a sensing " characteristic.Such as: described pointer 740 utilizes described dynamics data to detect institute
State the use of pointer 740, so that operating mode is changed the pointer biography to an active from a lower powered sleep pattern
Sending pattern, it is described that it is similar to collocation Fig. 7 B.In other embodiments, described pointer 740 transmits pointer and transmits letter
Occur while numbers 677 dynamics data and maintain actively have an extra time out period after (such as: 15 seconds).At one
In embodiment, again may be by detecting the transmission signal (transmitting signal 632) of described Touch Screen, detection LCD monitor
(LCD) noise, and/or the optical signalling of detection LCD monitor detects the use of described pointer nib 745.Fig. 7 A arrives
Characteristic described in 7C can be used by independent or any combination of mode.
One block chart of Fig. 8 is the embodiment illustrating a pointer 800.Described pointer 800 comprises one
Waveform generator 810, a waveform shaping device 830, and one enable square 850.In one embodiment, described waveform produces
Device 810 is an agitator.Described agitator can be a quartz, a ceramic resonator, ring oscillator, and central authorities process
The internal oscillator of unit, relaxation oscillator, or there is other waveform generation in the technique that know known to usual knowledge personage
Circuit.In one embodiment, described waveform generator 810 produces a pointer and transmits signal 820, and is couple to institute
State waveform shaping device 830 for processing further.
Described waveform shaping device 830 may be configured the demand set to regard the touch control screen controller (not shown) received to be come
The frequency of moulding described transmission signal 820, dutycycle, phase place, or intensity.Should described it should be noted that: 820 in square-wave form,
840, and 860 signal waveforms being not intended to point out reality, and only the appearance of a signal pointed out in outline.Described waveform is moulded
Shape device 830 may be configured setting and with modulation or encodes described transmission signal 820, and as above arranged in pairs or groups, Fig. 6 B is described.One
In individual embodiment, described waveform shaping device 830 described transmission signal 820 is couple to described in enable square 850.Should for some
For with, described transmission signal 820 is not necessarily and transmits the integral part that signal produces.Such as: moulding from described waveform
The signal 820 that transmits of device 830 does not need extra waveform moulding.So, some embodiments do not need described waveform moulding
The device 830 design in described pointer 800.
In one embodiment, described in enable square 850 and be configured and set to enable the running of low-power or sleep pattern,
The most above collocation Fig. 7 C is described.The described square 850 that enables can act as a separate side as shown in Figure 8
Block, or can be incorporated in the square of described waveform generator 810 or waveform shaping device 830.In one embodiment, institute
State enable square 850 provide a feedback path to described waveform generator 810 and/or the square of waveform shaping device 830, with control
System activity during aggressive mode and sleep pattern.Such as: enable described in if square 850 judge described pointer 800 by
Described should be switched to sleep pattern from aggressive mode in user non-activity, then described in enable square 850 feedback be provided
Signal 870 produces one transmit signal 820 and 840 to stop described waveform generator 810 or waveform shaping device 830.At one
In embodiment, described in enable square 850 in the aggressive mode of described pointer, described transmission signal 860 is couple to described touch
A control nib.
In one embodiment, described pointer 800 can be powered from a local main battery, the most one or more
AAA battery unit, button-shape battery unit, hearing aid batteries etc..Another or, charged electric pool unit can be used,
Including but not limited to ni-mh formula battery, can oar Polymer cell, cell of fuel cell, and super or ultra-capacitor.
Described pointer 740 can be contained in described Touch Screen as a charging station configuration and setting by shell equally, or through resistance
Property, capacitively or inductively device receives power, has in the technique and knows known to usual knowledge personage.
In one embodiment, described pointer 800 is configured setting and transmits signal 860, described transmission to transmit one
The transmission letter that the transmission drive circuit 610 of the Touch Screen being similar in fig. 6 is provided is presented on signal 860 is electrical
Numbers 632.In one embodiment, described touch control screen controller (not shown) is the CY8CYMA300 type process of Sai Pulasi
Device.Another or, other touch control screen controller can be used.Although can use, there is usual knowledge man in the technique
Scholar known other transmit waveform (such as: sinusoidal wave, triangular wave, spread spectrum ripple) and operation frequency, but described Touch Screen
Controller typically produces the transmission signal 820,840 of a square wave, and 860 in the scope of 100KHz to 300KHz.
Narration is to a mutual capacitance touching control screen system of one active pointers 680 of support herein, wherein said
Pointer is configured and is set as sequential " leading (master) ", and described touch control screen controller 605 adjusts its sequential to make
The sequential of described pointer is mated during by described pointer 680.In other words, touch control screen controller 605 is configured setting to incite somebody to action
Described sensing array 400 is synchronized to described pointer 680.Various embodiments described herein are applicable to use and are configured
Set with by be capacitively coupled to described mutual capacitor array without being refining, or any mutual electricity of wireless active pointers
Hold touch control screen system, wherein said pointer do not receive from described touch control screen controller synchronization or time ordinal number
According to.Furthermore, in contrast to by described main frame carry out synchronize system, various and synchronization relevant different sequential process and process be
Derive from the transmission signal that described pointer transmits.
For describing the running of an embodiment of described system 600 sufficiently and operating moulds the different of described system 600
The sequential transition occurred between formula, are hereinafter in a cut-off state with described system 600 and start to provide one to take
The event sequence of sample.When start, the initialization procedure of described user's conducting power and system 600 starts.Conducting display is (not
Diagram) and initialize the subsystem (system 600) of described Touch Screen.In this time point, there is no finger, touch object, or touch-control
Pen comes close to or in contact with described sensing array 400.
One sequential chart 900 of Fig. 9 is based on one embodiment of the present of invention for occurring in without touch object
A mutual capacitance touching control screen system on Touch Screen.Described sequential chart 900 illustrates a controller and transmits signal 910,
One controller receives signal 920, and a pointer transmits signal 930 device.Described controller transmits signal 910 and comprises multiple
Controller transmits pulse 912.Described controller reception signal 920 comprises wait touch-control (WFT) and is spaced 922 and waits pointer
(WFS) interval 923.In one embodiment, described Touch Screen comprises described sensing array 400.
In running, a user conducting power and initialize described system.In one embodiment, described system 600
At a predetermined duty cycle, transmit a transmission signal 632 by transmission drive circuit 610 to come into operation.An embodiment
In, transmit the dutycycle dutycycle less than an aggressive mode finger or pointer wherein being detected of signal 632, for changing
The power dissipation of kind described system 600.During the transmission sense period 912 containing wait touch-control, described controller produces signal
632, touch control screen controller 605 listens to a corresponding signal that receives with inspection during waiting the reception sense period 922 of touch-control
Survey makes no have a finger to occur on described sensing array 400.In one embodiment, the transmission sensing week of touch-control is waited
The time that phase 912 occurs can be same as waiting the reception sense period 922 of touch-control.Touch-control interval 912/ is waited at each
After 922, described touch control screen controller 605 is carried out one during waiting pointer sense period 923 and is waited pointer sense
Survey running, to sense the use of pointer.In addition to described touch control screen controller 605 does not transmit described transmission signal 632,
The implementation at described wait pointer interval 923 is similar to the wait touch-control 922 of phase mutual capacitance.Otherwise, described Touch Screen controls
Device 605 is carried out and is received sensing, and will occur in described wait pointer interval 923 (that is: in the described wait pointer cycle 923
Period) afterwards higher than the signal that any reception signal determining is a pointer 680 of a predetermined noise threshold value.As long as not yet
Finger, touch object, or pointer being detected, described wait touch-control/wait pointer process continues as a background mistake
Journey.Described system can be in a low-power mode outside the scope of described wait touch-control/wait pointer sense period, with
The average power consumption of low entirety is caused when not having finger or pointer near described screen.
In an alternative embodiment, utilize described wait touch-control (phase mutual capacitance) and wait pointer (electric charge coupling
Connect), as above arranged in pairs or groups, Fig. 6 B is described.In another embodiment, by there being the wait touch-control/wait reducing dutycycle to touch
Control pen mode, and upon initialization, described touch control screen controller 605 starts finger and follows the trail of, and does not has as described in hereafter
Finger or pointer occur in the event on described sensing array 400.
One sequential chart 1000 of Figure 10 is based on one embodiment of the present of invention and points out present institute on the other hand for wherein having
State the mutual capacitance touching control screen system of on Touch Screen 600.Described sequential chart 1000 illustrates a controller and transmits letter
Numbers 1010, a controller receives signal 1020, and a pointer transmits signal 1030 device.Described controller transmits signal
1010 comprise multiple controller transmits pulse 1012.Described controller receive signal 1020 comprise wait touch-control interval 1022 and etc.
Treat pointer interval 1023.
In running, a finger is seated on described Touch Screen by a user.Described touch control screen controller 605
During described wait touch-control interval 912/922, detect described finger, and start the sensing that finger is followed the trail of.Finger is followed the trail of and can be wrapped
Containing being sent to sense in the some or all of transmission lines (OK) 635 of array 400 (1012) by transmitting signal in order, and one
It is received sensing (1022), as previously described on a little or all reception circuit (arranging) 640.In one embodiment, scanning
To complete can be periodically (such as: the interval of 10 milliseconds) or routinely (not shown).A finger once detected,
Described controller transmits signal 1010 can increase the dutycycle of described controller transmission pulse 1012, such as to improve sensing fortune
The signal to noise ratio made.After described mutual capacitance sensing (MCS) cycle 1022, described touch control screen controller 605 is in the cycle
Carry out one during 1023 and wait pointer running.In one embodiment, described row and/or row in some or all of in institute
State during wait pointer interval 1023 by foot bit multiplexed device institute " linkage (ganged) " or short circuit is together, and described touch-control
Screen controller 605 detects pointer transmission signal 677 as single-sensor to scan whole described sensing array 400
(rather than local) occurs.The appearance of described pointer once being detected, described touch control screen controller 605 is then such as previous institute
Narration positions and/or follows the trail of described pointer.Another or, described row and/or row are during described wait pointer interval 1023
" do not linked ".Described wait pointer interval 1023 duration (such as: 100 to 200 microseconds) be typically shorter than phase
Mutual capacitance sense period 1022.In one embodiment, described touch control screen controller 605 periodically carry out described wait touch
Control pen senses rather than after each waits touch-control interval.Such as: wait that pointer can be every 100 milliseconds or every 10
Occur after the scanning of secondary mutual capacitance sensing.
One sequential chart 1100 of Figure 11 is based on one embodiment of the present of invention for wherein there being a pointer 680 to go out
A mutual capacitance touching control screen system 600 on presently described Touch Screen.Should described it should be noted that: described pointer 680
Seem and occur in around 1132, but be not occur at the beginning.Described sequential chart 1100 illustrates a controller and transmits signal
1110, a controller receives signal 1120, and a pointer transmits signal 1130.Described controller transmits signal 1110 and wraps
Transmit the sender cycle 1112 containing controller, 1114,1116, and 1118.Described controller receives signal 1120 and comprises wait touch-control
Interval 1122,1124, and 1129.Described controller receives signal 1120 and comprises wait pointer interval 1123 Hes further
1125.Described pointer transmits signal 1130 and comprises pointer transmission pulse 1132,1134, and 1136.
In one embodiment (not shown), described pointer 680 transmits described pointer continuously and transmits letter when transmitting
Numbers 1130.In another embodiment, described pointer 680 transmits a pointer with some dutycycle and transmits signal
1130.Such as: every 10 milliseconds of described pointer 680 persistently transmits pointer and transmits signal 1130 and have 2 milliseconds.At another
In embodiment, described pointer 680 can transmit burst in a dutycycle.Such as: described pointer 680 is micro-to have 50
100 microseconds in second gap transmit a total of 4 milliseconds of signal 1130 from sending persistently one pointer of transmission, and then stop transmitting
There are 6 milliseconds.The dutycycle by can be implemented other is known as having in the technique known to usual knowledge personage.An embodiment
In, described dutycycle can detect and the first of described Touch Screen by the force sensor in described pointer nib 688
Change during secondary contact.In another embodiment, described pointer 680 may not start to transmit described transmission signal
1130, until aforementioned contact being detected.But, state in each of the front in case, once contact with described Touch Screen, described
Beginning with a default dutycycle or burst mode or is continued for transmitting by pointer 680.
In one embodiment, described touch control screen controller 605 senses described pointer and transmits signal 1130, and in institute
State pointer transmit signal reception sensing start before first receptions sensing is synchronized to described pointer transmission signal 1130.Allusion quotation
Type ground, described pointer transmits signal 1130 and easily carries out detecting and being synchronized with receiving sensing circuit with having a high impedance
Touch control screen controller 605 (indium tin oxide typically one highly-resistant material of formula).There is connecing of a relatively low impedance
Receive in an embodiment of sensing circuit, described reception sensing circuit particular sensor on described sensing array 400 is broken
Open and be probably necessity, for making described pointer transmit signal 1120, there is an amplitude being high enough to be detected.
In one embodiment, a phase-locked loop (P L L) (not shown) can be used to detection and by described touch-control
The reception sensing circuit of screen controller 605 is phase-locked to described pointer and transmits signal 1120.On typical case, described Touch Screen control
Device 605 processed is to receive sensing running beginning in stylus modes in each to carry out phase locking process (such as sequential chart 1100
Shown in), and be not only during waiting pointer sensing.Described phase-locked loop can be based on emulation or numeral.?
In one embodiment, the described phase-locked loop of numeral is implemented in firmware mode.
In running, described system 600 connect in the first time on described Touch Screen from a touch object or pointer
First will initialize before Chuing and wait touch-control/wait stylus modes (such as: wait touch-control 1122 and wait pointer 1123).
Active and the pointer 680 enabled carry out contacting described Touch Screen, and transmit a transmission signal during the cycle 1132.?
In one embodiment, described touch control screen controller 605 detects described pointer transmission between pointer interval 1125 waiting
Signal 1132.Described controller receives signal 1120 and then keeps actively (controller receives the cycle 1126) to touch with the detection next one
Control pen transmits pulse 1134, obtains the time sequence information of abundance so that described touch control screen controller 605 is synchronized to described touch-control
Pen 680.At the end of receiving the cycle 1126 to controller, touch control screen controller 605 transmits signal 1130 with described pointer
Set up and synchronize.On typical case, synchronize to will occur in two complete signal cycle.As indicated, described controller receives signal
1128 originate in next pointer transmits the beginning of pulse 1136.Additionally, described touch control screen controller 605 is by described control
The wait touch-control cycle 1118 that device transmits is synchronized to described pointer and transmits pulse 1136, and it can change described wait touch-control
Sensing speed.In another embodiment, described wait touching signals (being not detected by finger) may be configured setting to occur same
Before the pointer of step transmits pulse.In a case in office, described wait touch-control sensing is known will not send in described pointer
Carry out during cycle when pointer transmits signal.
Although being not shown in described sequential chart, but described pointer 680 may be configured setting to modulate described touch-control
Pen transmits signal 1130 and comprises excessive data (such as: dynamics data, accelerating data, pushbutton data, power level etc.).Separately
Or, described pointer 680 may be configured setting to practice extra number as described in transmission on road described herein a communication
According to.
In one embodiment, described touch control screen controller 605 only senses and detects that described pointer arrives finally
The row and column of the contact point environs of described Touch Screen.If described pointer being detected in the region, the most described tactile
Control screen controller 605 does not carry out any further sensing the outside of this environs.Such as: described Touch Screen control
Device 605 processed can scan 12 row and 12 row of the local row and column central authorities described pointer finally being detected, as long as and continuing
Detect in this region described pointer the most persistently scan finally detect local 12 row around of described pointer/
Row；Notice that the movement along with described pointer is moved by this region, unless described pointer moves too fast and removes described
The region sensed is carried out with single scanning rate interval.In another embodiment, described touch control screen controller 605 was based on previously
Two or more scanning predict the current place of described pointer to judge speed and the direction of described pointer, and will detection
Region is centered at is predicted at place.In one embodiment, if detecting that a pointer and finger are (such as institute's example in Figure 12
Show), whole screen may need scanned, and other local prediction algorithm may need to be applied to each input source
Judge a scanning area reduced.
Finger appearance on described Touch Screen can affect the accuracy that described pointer is followed the trail of.Such as: finger (touches
Control object) another row can be couple to transmitting signal from a line, or be coupled between row and column.Therefore, even if some are real
Execute example and do not support a pointer and the synchronous tracking of a finger, during pointer is followed the trail of, carry out waiting touch-control sense
Survey and think that adjusting the electrically change sensed by the appearance of a finger is probably favourable.
One sequential chart 1200 of Figure 12 is based on one embodiment of the present of invention for wherein having a finger and one
Pointer 680 simultaneously appears in the mutual capacitance touching control screen system of on described Touch Screen 600.Described sequential chart 1200
Illustrating a controller and transmit signal 1210, a controller receives signal 1220, and a pointer transmits signal 1230.Institute
State controller transmission signal 1210 and comprise controller transmission pulse 1212 and 1214.Described controller receives signal 1220 and comprises phase
Mutual capacitance sense period 1223 and 1225, and pointer sensing (SS) cycle 1222/1232 and 1224/1234.Described pointer
Transmission signal 1230 comprises pointer transmission and transmits the cycle 1232 and 1234.
Sequential chart 1200 describes generally one finger of synchronous tracking and pointer according to one embodiment of the present of invention
Position.As the most described, described controller is transmitted the timing synchronization of signal 1210 by described touch control screen controller 605
Signal 1230 is transmitted so that described controller transmits signal will not when described pointer transmits signal function to described pointer
Transmitted.Such as: the described mutual capacitance sensing cycle 1222 is synchronized to described pointer and transmits the cycle 1232.Furthermore, touch-control
Screen controller adjusts described controller and transmits cycle 1212 and mutual capacitance sensing cycle 1223 to occur in described pointer
After transmitting pulse 1232 (and transmit the beginning of pulse 1234 after participating in pointer before).As above chatted
Stating, pointer transmits sensing can be faster than finger sensing.Such as: a pointer transmission pulse can every 10 milliseconds of generations one
There is the persistent period of 3 milliseconds.Take to carry out finger sensing/tracking for described touch control screen controller for remaining 7 milliseconds.
When removing described pointer from described Touch Screen, if described finger remains close to described Touch Screen, then
Described system 600 will persistently be tracked as described in Figure 13 above arranged in pairs or groups.In one embodiment, described pointer can be
Following situation stops sending pointer and transmits signal: when described pointer nib no longer detects and the contacting of described Touch Screen
Time, after cycle default timeout, after described pointer no longer detecting on the other hand, or end described pointer
Time, as previously described.When finger or pointer do not keep contacting described screen, described system 600 as discussed previously with
One dutycycle reduced performs wait touch-control and wait pointer sensing.
One flow chart 1300 of Figure 13 is the side detecting a pointer 680 on a sensing array 400
One embodiment of method.At square 1310, a pointer locally produces a pointer and transmits signal 677.At one
In embodiment, produce described pointer by a waveform generator in transmitting drive circuit 610 and transmit signal.Described
Pointer transmits signal 677 and excessive data can be used to be modulated, and comprises dynamics data as previously described, button number
According to, power data etc..
Described pointer transmission signal 677 is capacitively coupled to described sensing array 400 (square by described pointer 680
1320).Described sensing array 400 is synchronized to described pointer and transmits signal 677 (square by one touch control screen controller 605
1330).Described touch control screen controller 605 follows the trail of the described pointer 680 position (square on described sensing array 400
1340).In one embodiment, described touch control screen controller 605 is configured setting to follow the trail of described pointer 680 He simultaneously
The position of another touch object (such as: finger, palm etc.).
Embodiments of the invention described herein comprise various running.By nextport hardware component NextPort, software, firmware, aforementioned one
Combination can carry out more described running.As used herein, word " is couple to " to mean and directly couples or through one
Indirectly coupling of individual or more intermediaries component.The various total online any signals provided described in this article can and other
Signal carries out time multiplexing, and is provided at one or more sharing the most online.Additionally, between circuit member or square
Interconnection can be shown as bus or mono signal circuit.Each bus of more described bus can be selected else as one or more
Mono signal circuit, and each mono signal circuit of institute's number mono signal circuit can select else as bus.
Some embodiment may be implemented such that and can comprise the meter being stored on a computer readable medium
Calculate device program product.More described instruction can be used to program the fortune that one general or special purpose processors is described with implementation
Calculate.One computer readable medium comprises for storage or transmits and have a machinery (such as: a computer) and can read
Any mechanism of information of a form (such as: software, process application program).The storage medium of described computer readable
Can be including but not limited to magnetic-based storage media (such as: diskette), optical storage medium (such as: read-only optical disc), magnetic
Optical activity storage medium, read only memory (ROM), random access memory (RAM), erasable programmable memorizer (such as:
EPROM, EEPROM), flash memory, or it is suitable for storing the medium of another pattern of e-command.Described computer
The transmission medium that can read can be including but not limited to electrically, optics, rises ripple, or the transmitting signal of other forms is (such as: carry
Ripple, infrared signal, digital signal, or the like), or it is suitable for transmitting the medium of another pattern of e-command.
Additionally, some embodiments can be implemented in a distributed computing environment, wherein said computer readable
Medium is stored on the calculator system more than and/or calculator system more than one performs described in passing through.This
Outward, the information being transferred between calculator system can be crossed over and is connected to the transmission medium of described calculator system and lead
Draw or push.
Although showing with a particular order and the running of method in described article, can be to the running of each method
Order make change so that some running can an anti-phase order be carried out, or make some operate can be at least part of
Ground is carried out with other runnings simultaneously.In another embodiment, the instructions of different runnings or sub-instructions may be at an interval and/
Or alternative form.
In the above specification, the present invention makes narration by reference to its specific one exemplary embodiment.But, aobvious and easy
See: can to the present invention, various modifications and changes may be made without the widest spirit and scope deviating from the present invention, as additional
Mentioned by claim.Accordingly, described description and graphic be considered an exemplary meaning and non-limiting sense.
Claims (18)
1. for a touch sensing device for pointer, comprising:
One capacitive sensing array, it includes row electrode and row electrode, and described capacitive sensing array is configured setting with inspection
Surveying a passive touch object and the appearance of an active pointers, wherein said active pointers is configured setting to provide one
Individual signal, and described capacitive sensing array be configured setting with via capacitive coupling with receive from described active touch-control
The described signal of pen；And
One processing apparatus, it is coupled to described capacitive sensing array, described processing apparatus be configured setting with receive by
The described signal that described capacitive sensing array receives, wherein said processing apparatus is configured setting further with based on by described
The running of described capacitive sensing array is synchronized to described active pointers by the described signal that capacitive sensing array receives
Running.
Device the most according to claim 1, wherein said device includes first mode and the second pattern, and described electric capacity is sexy
Surveying array and operate in described first mode is the mutual capacitance sensing array of an all points addressable, and described electric capacity sexuality
Surveying array and operating in described second pattern is that an electric charge couples receptor.
Device the most according to claim 1, it is described passive tactile to follow the trail of simultaneously that wherein said processing apparatus is configured setting
Control object and described active pointers position on described capacitive sensing array.
Device the most according to claim 3, wherein said device includes first mode and the second pattern, and described electric capacity is sexy
Surveying array and being configured setting in described first mode with running during following the trail of the position of described passive touch object is one
Mutually capacitance sensing array, and described capacitive sensing array is configured setting to follow the trail of described master in described second pattern
During the position of dynamic pointer, running is that an electric charge couples receptor.
Device the most according to claim 1, wherein said capacitive sensing array includes row electrode and row electrode, Qi Zhongsuo
State processing apparatus and be configured setting to utilize described row electrode and described row electrode as receiving (RX) electrode to follow the trail of
State the position of active pointers, and wherein said processing apparatus is configured setting to use described row electrode or described row electrode to make
The position of described passive touch object is followed the trail of for described reception (RX) electrode.
Device the most according to claim 1, wherein said active pointers is turned on by least one in following: one
Hand switch, the touch-control to the capacitive character touch sensing being arranged on described active pointers, or in described active
An applying dynamics on one tip of pointer.
Device the most according to claim 1, wherein said processing apparatus includes a demodulator square, with demodulation by
Described active pointers provide described signal and the excessive data modulated in described signal by described active pointers is picked
Take out, wherein said excessive data comprise following at least one: one apply force value, button state data, or
Battery status data.
Device the most according to claim 7, wherein said excessive data by least one in following to be modulated onto
In described signal: amplitude shift keying, frequency shift keying, on-off keying, pulse position keying, PPK, binary phase shift keying, or orthogonal phase shift
Keying.
Device the most according to claim 1, wherein said passive touch object is a finger.
Device the most according to claim 1, wherein when described active pointers contacts described capacitive sensing array,
Described active pointers provides described signal.
11. 1 kinds of sensing method of touch control for pointer, comprising:
Via a capacitive coupling between a capacitive sensing array and an active pointers with at described electric capacity
Sexy survey receives a transmission signal from described active pointers at array, wherein, described capacitive sensing array includes
First mode and the second pattern；
The running of described capacitive sensing array to described active pointers being synchronized, wherein said active pointers is a master
The time schedule controller led, described capacitive sensing array is configured setting and passively touches to operate on one in described first mode
The finger position of control object is followed the trail of, and described capacitive sensing array is configured setting to operate in described second pattern
The pointer location of described active pointers is followed the trail of；And
When in sync, the sensing modes of described capacitive sensing array turns between described first mode and described second pattern
Change.
12. methods according to claim 11, wherein said capacitive sensing array includes row electrode and row electrode, wherein
Described capacitive sensing array uses described row electrode and the conduct of described row electrode to receive electrode in described second pattern,
To receive the pointer location tracking carrying out described active pointers from the described transmission signal of described active pointers, and
Wherein said capacitive sensing array uses described row electrode or described row electrode as described reception in described first mode
Electrode, carries out described passive touch-control pair to receive a transmission signal of the carry electrode from described capacitive sensing array
The finger position of elephant is followed the trail of.
13. methods according to claim 11, farther include:
Carry out described finger position to follow the trail of；
Carry out and while described pointer location is followed the trail of, carry out the tracking of described finger position；And
Using frequency modulation(PFM), Modulation and Amplitude Modulation, at least one in phase-modulation, or code modulated distinguishes described active pointers
Described position with described passive touch object.
14. methods according to claim 13, wherein, described transmission signal by described active pointers according in following
At least one is modulated to include excessive data: amplitude shift keying, frequency shift keying, and binary phase-shift is modulated, or orthogonal phase shift modulation, and
And the described position distinguishing described active pointers and described passive touch object farther includes:
Demodulate described transmission signal with capture by described active pointers modulate in described transmission signal described additionally
Data；
Wherein said excessive data comprise following at least one: one apply force value, button state data, or battery
Status data.
15. methods according to claim 11, wherein when described active pointers contacts described capacitive sensing array,
Described active pointers provides described transmission signal.
16. 1 kinds of touch-control sensing systems for pointer, comprising:
One capacitive sensing array；
One pointer, wherein said pointer is configured setting to provide one to transmit a signal to institute via capacitive coupling
State capacitive sensing array；And
One senser element, it is coupled to described capacitive sensing array, and wherein said senser element is configured setting with thoroughly
Cross described capacitive coupling and receive the described transmission signal from described pointer, and by the fortune of described capacitive sensing array
It is synchronized to the running of described pointer.
17. systems according to claim 16, wherein said pointer is an active pointers, and described capacitive character
Sensing array is configured setting to follow the trail of a passive touch object and described active pointers in described capacitive character simultaneously
Position on sensing array.
18. systems according to claim 17, wherein said system includes first mode and the second pattern, described capacitive character
Sensing array is configured in described first mode and sets with running during following the trail of the position of described passive touch object as one
Individual mutual capacitance sensing array, and wherein said capacitive sensing array be configured in described second pattern setting with follow the trail of
During the position of described active pointers, running is that an electric charge couples receptor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US38546310P | 2010-09-22 | 2010-09-22 | |
| US61/385,463 | 2010-09-22 | ||
| PCT/US2011/045687 WO2012039837A1 (en) | 2010-09-22 | 2011-07-28 | Capacitive stylus for a touch screen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102576274A CN102576274A (en) | 2012-07-11 |
| CN102576274B true CN102576274B (en) | 2016-11-30 |
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ID=
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|---|---|---|---|---|
| WO2009078944A1 (en) * | 2007-12-14 | 2009-06-25 | Cypress Semiconductor Corporation | Compensation circuit for a tx-rx capacitive sensor |
| JP2010067117A (en) * | 2008-09-12 | 2010-03-25 | Mitsubishi Electric Corp | Touch panel device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009078944A1 (en) * | 2007-12-14 | 2009-06-25 | Cypress Semiconductor Corporation | Compensation circuit for a tx-rx capacitive sensor |
| JP2010067117A (en) * | 2008-09-12 | 2010-03-25 | Mitsubishi Electric Corp | Touch panel device |
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