CN109426380A - Touch device and its method for sensing and touch control sensing circuit - Google Patents
Touch device and its method for sensing and touch control sensing circuit Download PDFInfo
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- CN109426380A CN109426380A CN201710748229.7A CN201710748229A CN109426380A CN 109426380 A CN109426380 A CN 109426380A CN 201710748229 A CN201710748229 A CN 201710748229A CN 109426380 A CN109426380 A CN 109426380A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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Abstract
A kind of touch device and its method for sensing and touch control sensing circuit.Touch device includes touch panel and touch control sensing circuit.In first period, touch control sensing circuit applies identical drive signals to multiple sensing electrodes of touch panel simultaneously, and carries out self-tolerant touch control detection to these sensing electrodes, obtained from appearance testing result.In the second phase, touch control sensing circuit carries out mutual capacitance type touch control detection at least one sensing electrode in these sensing electrodes, to obtain mutual tolerance testing result.Touch control sensing circuit foundation mutual tolerance testing result judges whether the touch event of touch panel is caused by water with testing result is held certainly.
Description
Technical field
The present invention relates to a kind of touch-control sensings, and more particularly to a kind of touch device and its method for sensing and touch-control sensing
Circuit.
Background technique
In the application of embedded (in-cell) touch-control sensing, the common electrode layer (VCOM of display panel will use
Layer) as touch-control sensing electrode.Common electrode layer can be cut into multiple blocks (multiple sensing electrodes), to position touching
The position of control event.This common electrode layer needs to be couple to common voltage in display driving period, to ensure that pixel liquid crystal can be with
In operation in correct voltage.During touch-control sensing, this common electrode layer can be couple to touch control sensing circuit to carry out touch-control
Sensing.Anyway, in addition to common electrode layer in display panel, data line (or source electrode line) and scan line can also be contained
(or grid line).Therefore, parasitic capacitance is formed between common electrode layer and data line, between common electrode layer and scan line also
Form parasitic capacitance.When this common electrode layer carries out touch-control sensing, these parasitic capacitances will affect this common electrode layer (sensing
Electrode) capacitance.In order to reduce influence of these parasitic capacitances to touch-control sensing, during touch-control sensing, in addition to target sense
Surveying electrode (target common electrode) can be applied outside a driving signal, and data line can also be applied identical simultaneously with scan line
The driving signal, to eliminate the parasitism electricity between parasitic capacitance and VCOM and scan line between VCOM and data line
Hold.
It accidentally touches in order to prevent, when touch control sensing circuit detects large area touch event, existing touch control sensing circuit
Usually ignore this large area touch event, that is, touch control sensing circuit will not return the position of large area touch event to processing
Device.It is used in situation in practical touch-control, can often encounter the operation that wet finger carries out touch-control to In-cell touch display panel.If
The amount of water is more, and water brought by wet finger can occupy large area in In-cell touch display panel.Existing touch-control sense
Slowdown monitoring circuit can not differentiate the large area touch event caused because accidentally touching caused large area touch event and wet finger.Wet hand
Refer to the significant operation behavior of the caused large area touch event person of usually using, however existing touch control sensing circuit is logical
The touch event that can often this wet finger be caused is considered as accidentally touching and ignores this wet finger touch event.
Summary of the invention
The present invention provides a kind of touch device, the method for sensing of touch device and the touch control sensing circuit of touch device,
It may determine that whether touch event is caused by water.
The embodiment of the present invention provides a kind of touch device.Touch device includes touch panel and touch control sensing circuit.
Touch panel has multiple sensing electrodes, to sense touch event.Touch control sensing circuit is coupled to touch panel, to read this
The sensitive information of a little sensing electrodes.In first period, touch control sensing circuit applies identical driving to these sensing electrodes simultaneously to be believed
Number, and touch control sensing circuit carries out self-tolerant touch control detection (self-capacitance touch to these sensing electrodes
Detection), obtained from appearance testing result.In the second phase, touch control sensing circuit is at least one in these sensing electrodes
A sensing electrode carries out mutual capacitance type touch control detection (mutual-capacitor touch detection), to obtain mutual tolerance detection
As a result.Touch control sensing circuit foundation mutual tolerance testing result judges whether touch event is caused by water with testing result is held certainly.
The embodiment of the present invention provides a kind of method for sensing of touch device.The method for sensing includes: offer touch surface
Plate is to sense touch event；In first period, apply phase simultaneously by multiple sensing electrodes of the touch control sensing circuit to touch panel
Same driving signal, and self-tolerant touch control detection is carried out to these sensing electrodes, obtained from appearance testing result；In the second phase
Between, mutual capacitance type touch control detection is carried out at least one sensing electrode in these sensing electrodes by touch control sensing circuit, to obtain
Mutual tolerance testing result；And it is to judge touch event with from appearance testing result according to mutual tolerance testing result by touch control sensing circuit
It is no to be caused by water.
The embodiment of the present invention provides a kind of touch control sensing circuit, the sense of multiple sensing electrodes to read touch panel
Measurement information.In first period, touch control sensing circuit applies identical drive signals to these sensing electrodes simultaneously, and to these senses
It surveys electrode and carries out self-tolerant touch control detection, obtained from appearance testing result.In the second phase, touch control sensing circuit is to these sensings
At least one sensing electrode in electrode carries out mutual capacitance type touch control detection, to obtain mutual tolerance testing result.Touch control sensing circuit according to
According to mutual tolerance testing result with judge whether the touch event of touch panel is caused by water from testing result is held.
Based on above-mentioned, the touching of touch device, the method for sensing of touch device and touch device described in all embodiments of the present invention
Sensing circuit is controlled, self-tolerant touch control detection and mutual capacitance type touch control detection can be carried out to these sensing electrodes.It is examined according to mutual tolerance
Result is surveyed with from testing result is held, touch control sensing circuit may determine that whether touch event is caused by water.Therefore, wet finger institute
It is accidentally to touch caused large area touch event that the touch event of initiation, which will not be misdeemed,.
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and make in detail in conjunction with attached drawing
Carefully it is described as follows.
Detailed description of the invention
Fig. 1 is illustrated according to a kind of circuit box (circuit block) of touch device of one embodiment of the invention
Figure；
Fig. 2 is the situation schematic diagram according to the touch event of touch panel shown in explanatory diagram of the embodiment of the present invention 1；
Fig. 3 is another situation schematic diagram according to the touch event of touch panel shown in explanatory diagram of the embodiment of the present invention 1；
Fig. 4 is the flow diagram according to a kind of method for sensing of touch device of one embodiment of the invention；
Fig. 5 is the feelings for depicting touch panel shown in Fig. 1 according to one embodiment of the invention and carrying out self-tolerant touch control detection
Border schematic diagram；
Fig. 6 is the feelings for depicting touch panel shown in Fig. 1 according to one embodiment of the invention and carrying out mutual capacitance type touch control detection
Border schematic diagram；
Fig. 7 is to depict touch panel shown in Fig. 1 according to one embodiment of the invention to carry out the another of self-tolerant touch control detection
One situation schematic diagram；And
Fig. 8 is the circuit box schematic diagram according to touch control sensing circuit shown in one embodiment of the invention explanatory diagram 1.
Specific embodiment
" coupling (or connection) " word used in present specification full text (including scope of the claims) can refer to
Any direct or indirect connection means.For example, if it is described herein that first device coupling (or connection) is in second device, then
It should be construed as that the first device can be directly connected to the second device or the first device can be by other devices
Or certain connection means and be coupled indirectly to the second device.In addition, all possible places, use in the drawings and embodiments
Element/component/step of identical label represents same or like part.Using identical label or using identical in different embodiments
Element/component/step of term can be with cross-referenced related description.
Fig. 1 is shown according to a kind of circuit box (circuit block) of touch device 100 of one embodiment of the invention
It is intended to.According to design requirement, touch device 100 can be mobile phone, tablet computer, laptop or other can take
Formula electronic device.In further embodiments, touch device 100 can be advertising device, vending machine, bus information and look into
Inquiry machine or other fixed formula electronic devices.Touch device 100 includes touch panel 110, touch control sensing circuit 120 and processing
Device 130.Touch panel 110 has multiple sensing electrodes (such as sensing electrode 111 shown in Fig. 1).Touch panel 110 can sense
Touch event.According to design requirement, touch panel 110 can be any kind of capacitance type touch-control panel.For example, one
In a little embodiments, touch panel 110 can be embedded (in-cell) touch-control display panel, and this in touch panel 110
A little sensing electrodes (such as sensing electrode 111 shown in Fig. 1) can be multiple common electrodes in In-cell touch display panel.Institute
Common electrode is stated to be otherwise known as VCOM electrode.
Touch control sensing circuit 120 is coupled to touch panel 110, to read these sensing electrodes in touch panel 110
Sensitive information.According to design requirement, touch control sensing circuit 120 contains AFE(analog front end) (analog front end, AFE) electricity
Road, analog-to-digital conversion circuit, digital operational circuit and/or be other circuit/elements.The analog front circuit can be
Existing analog front circuit or other reading circuit/elements.The analog-to-digital conversion circuit can be existing simulation
Digital quantizer or other conversion circuit/elements.The digital operational circuit can be microcontroller, microprocessor or its
His processing circuit/element.
Processor 130 is coupled to touch control sensing circuit 120, with receive touch control sensing circuit 120 processing result (that is, touch
Touch the location information of event).In some embodiments, processor 130 can be to run operating system (Operation
System, OS) central processing unit (central processing unit, CPU).In further embodiments, processor
130 can be microcontroller, microprocessor, specific integrated circuit (Application-specific integrated
Circuit, ASIC), digital signal processor (digital signal processor, DSP), field programmable gate array
(Field Programmable Gate Array, FPGA) and/or other processing circuit/elements.
Fig. 2 is the situation schematic diagram according to the touch event of touch panel 110 shown in explanatory diagram of the embodiment of the present invention 1.
Touch control sensing circuit 120 can apply phase to these sensing electrodes (such as sensing electrode 111) in touch panel 110 simultaneously
Same driving signal, and touch control sensing circuit 120 can carry out self-tolerant touch control detection (self- to these sensing electrodes
capacitance touch detection).Therefore when some large area object 20 (such as palm) touches touch panel
When 110, it is big that touch control sensing circuit 120 can sense this via one or more sensing electrodes for being overlapped in large area object 20
Object oriented 20.Contact area due to this large area object 20 in touch panel 110 is greater than threshold value, touch control sensing circuit
120 can ignore the touch event that this large area object 20 is caused, that is, touch control sensing circuit 120 will not be by large area object
It returns to processor 130 20 position.Therefore, touch control sensing circuit 120 can prevent from accidentally touching.
Fig. 3 is illustrated according to another situation of the touch event of touch panel 110 shown in explanatory diagram of the embodiment of the present invention 1
Figure.It is used in situation in practical touch-control, can often encounter the operation that wet finger 30 carries out touch-control to touch panel 110.If water 31
Amount it is more, water 31 brought by wet finger 30 can large area is occupied on touch panel 110, as shown in Figure 3.If touch-control sense
Slowdown monitoring circuit 120 can not differentiate whether the object on touch panel 110 is water 31, then touch control sensing circuit 120 may be by this
The touch event that wet finger 30 is caused is considered as accidentally touching and ignores this wet finger touch event.However, what wet finger 30 was caused
The significant operation behavior of the large area touch event person of usually using, rather than accidentally touch.Therefore, touch control sensing circuit 120 can
To carry out following method for sensing, to judge whether touch event is caused by water 31.When touch control sensing circuit 120 can be differentiated
When touch event is caused by water 31 out, touch control sensing circuit 120 can be with the position (that is, position of wet finger 30) of water 31
It returns to processor 130.
Fig. 4 is the flow diagram according to a kind of method for sensing of touch device 100 of one embodiment of the invention.Fig. 4
Shown method for sensing includes step S410, step S420, step S430 and step S440.It is noted that these steps shown in Fig. 4
The sequence of rapid S410~S440 is a kind of exemplary embodiment, rather than sole mode.For example, in other embodiments,
Step S420 shown in Fig. 4 and the sequence of step S430 can overturn, that is, step S430 can be first performed, and then just execute step
Rapid S420.
Please refer to Fig. 1 and Fig. 4.Step S410 provides touch panel 110, to sense touch event.In first period (step
S420), touch control sensing circuit 120 can apply these sensing electrodes (such as sensing electrode 111) in touch panel 110 simultaneously
Add an identical drive signals, and self-tolerant touch control detection is carried out to these sensing electrodes, obtained from appearance testing result.
Fig. 5 is to depict touch panel 110 shown in Fig. 1 according to one embodiment of the invention to carry out self-tolerant touch control detection
Situation schematic diagram.Fig. 5 depicts the diagrammatic cross-section of touch panel 110, and touch panel 110 contain sensing electrode 111_1,
Sensing electrode 111_2, sensing electrode 111_3, sensing electrode 111_4, sensing electrode 111_5 and sensing electrode 111_6.Touch surface
Plate 110 has coating 112 (such as glass plate or other materials), to allow user is practical to touch.When water 31 is covered in
When on touch panel 110, as shown in figure 5, water 31 and one or more sensing electrodes (such as sensing electrode 111_2 shown in Fig. 5~
It will form parasitic capacitance between 111_5).When carrying out self-tolerant touch control detection, in addition to object sensing electrode is (such as shown in Fig. 5
Sensing electrode 111_4) it can be applied outside a driving signal, non-targeted sensing electrode (not sensed sensing electrode at present)
It can be applied the identical driving signal simultaneously, to reduce parasitic capacitance, as shown in Figure 5.It is described from appearance according to design requirement
Formula touch control detection can be existing self-tolerant touch control detection operation or the detection operation of other self-tolerants, and so it will not be repeated.
However, since the signal at the both ends of parasitic capacitance is all the same waveform, making when carrying out self-tolerant touch control detection
This parasitic capacitance is equivalent is not present.According to charge formula Q=C*V, when the voltage difference of the two ends V of parasitic capacitance is 0, then parasitism is electric
The quantity of electric charge Q=C*0=0 of appearance, that is, the capacitance C of parasitic capacitance is equivalent to 0.Therefore, in the situation shown in Fig. 5, touch-control sense
Slowdown monitoring circuit 120 can not judge have water 31 on touch panel 110.Also that is, indicating that touch panel 110 does not have from testing result is held
Touch event occurs.
Please refer to Fig. 1 and Fig. 4.In the second phase (step S430), touch control sensing circuit 120 can be to touch panel 110
These sensing electrodes at least one object sensing electrode carry out mutual capacitance type touch control detection, to obtain mutual tolerance testing result.
In mutual capacitance type touch control detection, object sensing electrode can be coupled to the analog front circuit of touch control sensing circuit 120, and other
Sensing electrode can be applied a driving signal.
Fig. 6 is to depict touch panel 110 shown in Fig. 1 according to one embodiment of the invention to carry out mutual capacitance type touch control detection
Situation schematic diagram.Water 31 shown in Fig. 6, touch panel 110, sensing electrode 111_1~111_6 and coating 112 are referred to Fig. 5
Related description, so it will not be repeated.In embodiment illustrated in fig. 6, touch control sensing circuit 120 includes analog front circuit 121, mould
Quasi- digital quantizer 122 and other circuit/elements.The output end of analog front circuit 121 is coupled to analog-digital converter 122
Input terminal.In the second phase (step S430), touch control sensing circuit 120 can be to these sensing electrodes of touch panel 110
In at least one object sensing electrode (such as sensing electrode 111_4) carry out mutual capacitance type touch control detection, with obtain mutual tolerance detection
As a result.In mutual capacitance type touch control detection, object sensing electrode (such as sensing electrode 111_4) can be coupled to touch control sensing circuit
120 analog front circuit 121, and other sensing electrodes (such as sensing electrode 111_1,111_2,111_3,111_5 and 111_
6) driving signal can be applied.According to design requirement, the mutual capacitance type touch control detection can be existing mutual capacitance type touch-control
Detection operation or the detection operation of other mutual capacitance types, so it will not be repeated.Therefore, touch control sensing circuit 120 can be in the second phase
Knowing in (during mutual capacitance type touch control detection) has object (water 31) on touch panel 110.
In embodiment illustrated in fig. 6, analog front circuit 121 includes operational amplifier 121_1 and capacitor 121_2.Fortune
Calculating amplifier 121_1 has inverting input terminal, non-inverting input and output end.The anti-phase input of operational amplifier 121_1
End is coupled to object sensing electrode (such as sensing electrode 111_4).The first end of capacitor 121_2 is respectively coupled to transport with second end
Calculate the inverting input terminal and output end of amplifier 121_1.The output end of operational amplifier 121_1 is coupled to analog-digital converter
122 input terminal.The non-inverting input of operational amplifier 121_1 couples reference voltage Vref.In the second phase (mutual capacitance type touching
Control detection during), reference voltage Vref is fixed voltage, and analog front circuit 121 can to object sensing electrode (such as
Sensing electrode 111_4) carry out mutual capacitance type touch control detection.In first period (during self-tolerant touch control detection), reference voltage
Vref is frequency signal, and analog front circuit 121 can carry out object sensing electrode (such as sensing electrode 111_4) from appearance
Formula touch control detection.
Please refer to Fig. 1 and Fig. 4.In step S440, touch control sensing circuit 120 can be detected according to the mutual tolerance of step S430
As a result with step S420 from holding testing result, to judge whether touch event is caused by water 31.For example, work as step
The mutual tolerance testing result of S430 indicates that touch panel 110 occurs touch event (explanation of ginseng Fig. 6 in detail), but step S420 from
Holding testing result expression touch panel 110, there is no when touch event (explanation of ginseng Fig. 5 in detail), touch control sensing circuit 120 can
To judge that touch event is caused by water 31.
Once knowing that the large area touch event of touch panel 110 is caused by water 31, then touch control sensing circuit 120 can
Returning the position of this large area touch event to processor 130.For example, when touch control sensing circuit 120 is in step
When S440 judges that touch event is caused by water 31, and user contact water 31 during in, touch control sensing circuit 120
Identical drive signals can be applied simultaneously to these sensing electrodes, and self-tolerant touch-control is carried out to these sensing electrodes again
Detection is returned the position of water 31 to processor 130 with obtaining the position of water 31.When touch control sensing circuit 120 judges to touch
When event is not caused by water, touch control sensing circuit 120 can ignore this large area touch event, that is, not by this large area
It returns to processor 130 position of touch event.
Fig. 7 is to depict touch panel 110 shown in Fig. 1 according to one embodiment of the invention to carry out self-tolerant touch control detection
Another situation schematic diagram.Water 31 shown in Fig. 7, touch panel 110, sensing electrode 111_1~111_6 and coating 112 can join
According to the related description of Fig. 5, so it will not be repeated.In the situation shown in Fig. 7, in addition to water 31 contacts touch panel 110, wet finger 30
Also touch panel 110 is contacted.When carrying out self-tolerant touch control detection, in addition to object sensing electrode (such as Fig. 7 shown in sensing electricity
Pole 111_4) it can be applied outside a driving signal, non-targeted sensing electrode (not sensed sensing electrode at present) also can be simultaneously
It is applied the identical driving signal, to reduce parasitic capacitance, as shown in Figure 7.Self-tolerant touch control detection described in Fig. 7 can join
According to the related description of Fig. 5, so it will not be repeated.Wet finger 30 can apply a reference voltage to water 31.Therefore feelings shown in Fig. 7
In border, since the signal at the both ends of parasitic capacitance is different wave, touch control sensing circuit 120 can sense this parasitic electricity
Hold, and then senses the position of water 31.Then, touch control sensing circuit 120 can return the position of water 31 to processor 130.
Fig. 8 is the circuit box schematic diagram according to touch control sensing circuit 120 shown in one embodiment of the invention explanatory diagram 1.
In embodiment illustrated in fig. 8, touch control sensing circuit 120 includes analog front circuit 121, analog-digital converter 122 and switch
Circuit 123.Switching circuit 123 is coupled to the input terminal of analog front circuit 121.Switching circuit 123 is coupled to touch panel 110
These sensing electrodes in belong to the multiple colleague's electrodes mutually gone together, as shown in Figure 8.In first period (self-tolerant touch control detection
During), these colleague's electrodes are coupled to the input terminal of analog front circuit 121 by switching circuit 123 in turn, so that before simulation
Terminal circuit 121 carries out self-tolerant touch control detection to these colleague's electrodes with time-sharing format respectively.In the second phase (mutual capacitance type touch-control
During detection), these colleague's electrodes are coupled to the input terminal of analog front circuit 121 by switching circuit 123 simultaneously, so that mould
Quasi- front-end circuit 121 carries out mutual capacitance type touch control detection to these colleague's electrodes.
In embodiment illustrated in fig. 8, analog front circuit 121 includes operational amplifier 121_1 and capacitor 121_2.Fortune
Calculating amplifier 121_1 has inverting input terminal, non-inverting input and output end.The anti-phase input of operational amplifier 121_1
End is coupled to switching circuit 123.The first end and second end of capacitor 121_2 are respectively coupled to the reverse phase of operational amplifier 121_1
Input terminal and output end.The output end of operational amplifier 121_1 is coupled to the input terminal of analog-digital converter 122.Operation is put
The non-inverting input of big device 121_1 couples reference voltage Vref.In the second phase (during mutual capacitance type touch control detection), reference
Voltage Vref is fixed voltage, and analog front circuit 121 can carry out object sensing electrode (such as sensing electrode 111_4)
Mutual capacitance type touch control detection.In first period (during self-tolerant touch control detection), reference voltage Vref is frequency signal, and is simulated
Front-end circuit 121 can carry out self-tolerant touch control detection to object sensing electrode (such as sensing electrode 111_4).
These colleague's electrodes are commonly coupled to the input terminal of analog front circuit 121, touch-control sense by switching circuit 123
Slowdown monitoring circuit 120 can obtain the mutual tolerance testing result of touch panel 110 within the short time (such as a cycle (cycle)).In
In embodiment illustrated in fig. 8, although touch control sensing circuit 120 can not know the essence of touch event during mutual capacitance type touch control detection
True position, but touch control sensing circuit 120 can be obtained within the short time (such as a cycle (cycle)) with mutual tolerance detection mode
Knowing touch panel 110, whether there is or not generation touch events, and then the large area for confirming that whether this touch event is caused by water 31 is touched
Event.When confirming this large area touch event is the touch event caused by water 31, then water 31 is contacted in user
In period, touch control sensing circuit 120 can carry out self-tolerant touch control detection again to these sensing electrodes to obtain water 31
Position, and the position of water 31 is returned to processor 130.When touch control sensing circuit 120 judges the large area touching of touch panel 110
When to touch event not be caused by water, touch control sensing circuit 120 can ignore this large area touch event, that is, not by this big face
It returns to processor 130 position of product touch event.
It is worth noting that, in different application situations, the related function of touch control sensing circuit 120 and/or processor 130
General programming language (programming languages, such as C or C++), hardware description language can be can use
(hardware description languages, such as Verilog HDL or VHDL) or other suitable programming languages come
It is embodied as software, firmware or hardware.The programming language that the correlation function can be performed can be arranged to any of calculating
Device can access medium (computer-accessible medias), such as tape (magnetic tapes), semiconductor
(semiconductors) memory, disk (magnetic disks) or CD (compact disks, for example, CD-ROM or
DVD-ROM), or internet (Internet) can be passed through, wire communication (wired communication), wirelessly communicated
(wireless communication) or other communication medias transmit the programming language.The programming language can be stored
In accessing in medium for calculator, in order to which the volume of the software (or firmware) is accessed/executed by the processor of calculator
Journey code (programming codes).For hardware realization, in one or more controllers, microcontroller, microprocessor, dedicated
In integrated circuit (ASIC), digital signal processor (DSP), field programmable gate array (FPGA) and/or other processing units
Various logic block, module and circuit can be used for realize or execute embodiment hereof described in function.In addition, of the invention
Device and method can be realized by the combination of hardware and software.
In conclusion touch device 100, the method for sensing of touch device 100 and touch-control described in all embodiments of the present invention fill
Set 100 touch control sensing circuit 120, can to these sensing electrodes of touch panel 110 carry out self-tolerant touch control detection with
Mutual capacitance type touch control detection.According to mutual tolerance testing result with from testing result is held, touch control sensing circuit 120 may determine that touch panel
Whether 110 touch event is caused by water.Therefore, it is to miss that the large area touch event that wet finger 30 is caused, which will not be misdeemed,
Touch caused large area touch event.
Although the present invention has been disclosed by way of example above, it is not intended to limit the present invention., any those skilled in the art
Member, without departing from the spirit and scope of the present invention, when can make some changes and embellishment, therefore protection scope of the present invention is when view
Subject to appended claims range institute defender.
Symbol description
20: large area object
30: wet finger
31: water
100: touch device
110: touch panel
111,111_1,111_2,111_3,111_4,111_5,111_6: sensing electrode
112: coating
120: touch control sensing circuit
121: analog front circuit
121_1: operational amplifier
121_2: capacitor
122: analog-digital converter
123: switching circuit
130: processor
S410, S420, S430, S440: step
Vref: reference voltage
Claims (17)
1. a kind of touch device, comprising:
Touch panel has multiple sensing electrodes, to sense touch event；And
Touch control sensing circuit is coupled to the touch panel to read the sensitive information of the multiple sensing electrode, wherein
In first period, the touch control sensing circuit applies identical drive signals, and institute to the multiple sensing electrode simultaneously
State touch control sensing circuit to the multiple sensing electrode carry out self-tolerant touch control detection with obtained from hold testing result,
In the second phase, the touch control sensing circuit carries out mutual tolerance at least one sensing electrode in the multiple sensing electrode
Formula touch control detection to obtain mutual tolerance testing result, and
The touch control sensing circuit judges the touch event according to the mutual tolerance testing result and the appearance testing result certainly
Whether caused by water.
2. touch device as described in claim 1, wherein the touch panel is In-cell touch display panel, it is the multiple
Sensing electrode is multiple common electrodes in the In-cell touch display panel.
3. touch device as described in claim 1, wherein when the mutual tolerance testing result indicates that institute occurs for the touch panel
State touch event, but it is described from hold testing result indicate the touch panel there is no when the touch event, the touching
Control sensing circuit judges that the touch event is caused by the water.
4. touch device as claimed in claim 3, wherein when the touch control sensing circuit judges that the touch event is by institute
State water it is caused when, user contact the water during in, the touch control sensing circuit is same to the multiple sensing electrode
When apply the identical drive signals, and it is described to obtain to carry out the self-tolerant touch control detection to the multiple sensing electrode
The position of water, and the position of the water is returned to processor.
5. touch device as described in claim 1, wherein the touch control sensing circuit includes:
Analog front circuit；And
Switching circuit, is coupled to the input terminal of the analog front circuit, and is coupled in the multiple sensing electrode and belongs to
Mutually multiple colleague's electrodes of colleague, wherein
In the first period, the multiple colleague's electrode is coupled to the analog front circuit by the switching circuit in turn
The input terminal, so that the analog front circuit carries out the self-tolerant touch-control to the multiple colleague's electrode with time-sharing format
Detection, and
In the second phase, the multiple colleague's electrode is coupled to the analog front circuit simultaneously by the switching circuit
The input terminal, so that the analog front circuit carries out the mutual capacitance type touch control detection to the multiple colleague's electrode.
6. touch device as claimed in claim 5, wherein the analog front circuit includes:
Operational amplifier has inverting input terminal, non-inverting input and output end, wherein the inverting input terminal is coupled to
The switching circuit, the non-inverting input couple reference voltage；And
Capacitor, has first end and second end, and the first end and the second end are respectively coupled to the operational amplifier
The inverting input terminal and the output end.
7. the touch device as described in claim 6, wherein the reference voltage described in the first period is frequency signal, with
And the reference voltage described in the second phase is fixed voltage.
8. a kind of method for sensing of touch device, comprising:
Touch panel is provided to sense touch event；
In first period, applies identical driving simultaneously by multiple sensing electrodes of the touch control sensing circuit to the touch panel and believe
Number, and self-tolerant touch control detection is carried out to the multiple sensing electrode, obtained from appearance testing result；
In the second phase, at least one sensing electrode in the multiple sensing electrode is carried out by the touch control sensing circuit mutual
Appearance formula touch control detection, to obtain mutual tolerance testing result；And
The touching thing is judged according to the mutual tolerance testing result and the appearance testing result certainly by the touch control sensing circuit
Whether part is caused by water.
9. method for sensing as claimed in claim 8, wherein the touch panel is In-cell touch display panel, it is the multiple
Sensing electrode is multiple common electrodes in the In-cell touch display panel.
10. method for sensing as claimed in claim 8, wherein when the mutual tolerance testing result indicates that institute occurs for the touch panel
State touch event, but it is described from hold testing result indicate the touch panel there is no when the touch event, the touching
Control sensing circuit judges that the touch event is caused by the water.
11. method for sensing as claimed in claim 10, wherein when the touch control sensing circuit judge the touch event be by
When the water is caused, and during user contacts the water in, the touch control sensing circuit is to the multiple sensing
Electrode applies the identical drive signals simultaneously, and carries out the self-tolerant touch control detection to the multiple sensing electrode to obtain
The position of the water is obtained, and the position of the water is returned to processor.
12. a kind of touch control sensing circuit, the sensitive information of multiple sensing electrodes to read touch panel, in which:
In first period, the touch control sensing circuit applies identical drive signals simultaneously to the multiple sensing electrode, and right
The multiple sensing electrode carries out self-tolerant touch control detection, with obtained from holding testing result,
In the second phase, the touch control sensing circuit carries out mutual tolerance at least one sensing electrode in the multiple sensing electrode
Formula touch control detection, to obtain mutual tolerance testing result, and
The touch control sensing circuit judges the touch panel according to the mutual tolerance testing result and the appearance testing result certainly
Touch event whether caused by water.
13. touch control sensing circuit as claimed in claim 12, wherein when the mutual tolerance testing result indicates the touch panel
Occur the touch event, but it is described from hold testing result indicate the touch panel there is no when the touch event,
The touch control sensing circuit judges that the touch event is caused by the water.
14. touch control sensing circuit as claimed in claim 13, wherein when the touch control sensing circuit judges the touch event
When being caused by the water, and user contact the water during in, the touch control sensing circuit is to the multiple
Sensing electrode applies the identical drive signals simultaneously, and carries out the self-tolerant touch-control to the multiple sensing electrode and examine
It surveys, to obtain the position of the water, and the position of the water is returned to processor.
15. touch control sensing circuit as claimed in claim 12, comprising:
Analog front circuit；And
Switching circuit, is coupled to the input terminal of the analog front circuit, and is coupled in the multiple sensing electrode and belongs to
Mutually multiple colleague's electrodes of colleague, wherein
In the first period, the multiple colleague's electrode is coupled to the analog front circuit by the switching circuit in turn
The input terminal, so that the analog front circuit carries out the self-tolerant touch-control to the multiple colleague's electrode with time-sharing format
Detection, and
In the second phase, the multiple colleague's electrode is coupled to the analog front circuit simultaneously by the switching circuit
The input terminal, so that the analog front circuit carries out the mutual capacitance type touch control detection to the multiple colleague's electrode.
16. touch control sensing circuit as claimed in claim 15, wherein the analog front circuit includes:
Operational amplifier has inverting input terminal, non-inverting input and output end, wherein the inverting input terminal is coupled to
The switching circuit, the non-inverting input couple reference voltage；And
Capacitor, has first end and second end, and the first end and the second end are respectively coupled to the operational amplifier
The inverting input terminal and the output end.
17. touch control sensing circuit as claimed in claim 16, wherein the reference voltage described in the first period is frequency letter
Number, and the reference voltage described in the second phase is fixed voltage.
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