CN108279802A - Detection circuit and its driving method, touch device - Google Patents
Detection circuit and its driving method, touch device Download PDFInfo
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- CN108279802A CN108279802A CN201810053980.XA CN201810053980A CN108279802A CN 108279802 A CN108279802 A CN 108279802A CN 201810053980 A CN201810053980 A CN 201810053980A CN 108279802 A CN108279802 A CN 108279802A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
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Abstract
The present invention provides a kind of detection circuit, in touch device, touch device to include touch base plate, and touch base plate includes touch control unit and environmental detection sensor；Environmental detection sensor detects signal for build environment, and detection circuit includes first input end, the second input terminal, Current Voltage conversion module and transmission module, and first input end is for connecting touch control unit, to receive touch-control sensing current signal；Second input terminal is used for the output end of JA(junction ambient) detection sensor；Transmission module provides environment measuring current signal for the comprehensive detection sub-stage in the touch-control stage for Current Voltage conversion module；The input terminal of Current Voltage conversion module is connected with the first input end of detection circuit, transmission module, for being exported after the current signal for flowing into its input terminal is converted to voltage signal.The present invention also provides a kind of driving method of above-mentioned driving circuit, display devices.The present invention can simplify the structure of detection circuit, and will not cause the increase of detection time.
Description
Technical field
The present invention relates to technical field of touch control, and in particular to a kind of detection circuit and its driving method, touch device.
Background technology
In touch base plate, driving electrodes and induction electrode form mutual capacitance, when carrying out touch control detection, are carried for driving electrodes
For touch-control drive signal, touch control detection circuit judges position of touch by detecting the touch-control sensing signal on induction electrode.Mesh
Before, in order to increase the function of touch device, meeting the integration environment detection sensor (such as temperature detection, light detection on touch base plate
Equal sensors), and individual environment measuring circuit is set, it is carried out with the environment measuring signal generated according to environmental detection sensor
Environment measuring.But this can cause the overall structure of detection circuit more complicated, and improve touch base plate and answered with what detection circuit integrated
Miscellaneous degree；Even and touch control detection and environment measuring share the same detection circuit, and can cause the increase of detection time.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art, it is proposed that a kind of detection circuit and its
Driving method, touch device to simplify the structure of detection circuit, and will not cause the increase of detection time.
One of in order to solve the above-mentioned technical problem, the present invention provides a kind of detection circuit, is used in touch device, described to touch
It includes touch base plate to control device, and the touch base plate includes touch control unit and environmental detection sensor；The environment measuring sensing
Device is used to detect signal according to environmental information build environment；
The detection circuit includes first input end, the second input terminal, Current Voltage conversion module and transmission module,
The first input end is for connecting the touch control unit, to receive touch-control corresponding with the touch control unit size
Sensor current signal；Second input terminal is used to connect the output end of the environmental detection sensor；
The transmission module is received for the comprehensive detection sub-stage in the touch-control stage according to second input terminal
Environment measuring signal provides corresponding environment measuring current signal for the Current Voltage conversion module；And in the touch-control stage
Touch control detection sub-stage, stop to the Current Voltage transmission module provide signal；
The input terminal of the Current Voltage conversion module and the first input end of the detection circuit, the transmission module phase
Even, the Current Voltage conversion module after the current signal for flowing into its input terminal is converted to voltage signal for exporting.
Preferably, the environment measuring signal that the environmental detection sensor generates is voltage signal, the transmission module packet
Include the first gating switch, the second gating switch and storage capacitance；
First gating switch is for the electric charge accumulating time section in the comprehensive detection sub-stage, by environment measuring
The output end of sensor is connected with the first end of the storage capacitance；And when electric charge transfer in the comprehensive detection sub-stage
Between section, the first end of the output end of environmental detection sensor and the storage capacitance is disconnected；
Second gating switch is used in the charge transfer time section, by the first end of the storage capacitance with it is described
The input terminal of Current Voltage conversion module is connected；And in the electric charge accumulating time section, by the first end of the storage capacitance with
The input terminal of the Current Voltage conversion module disconnects；
The second end of the storage capacitance is connected with reference voltage end.
Preferably, the transmission module further includes the first Resetting Switching, and first Resetting Switching is used in the touch-control
The first end of the storage capacitance is connected the resetting sub-stage in stage with reset voltage end.
Preferably, the Current Voltage conversion module includes operational amplifier, feedback capacity and the second Resetting Switching,
The both ends of the feedback capacity are connected with the reverse input end of operational amplifier and output end respectively；
Second Resetting Switching is connected with the both ends of feedback capacity, in the resetting sub-stage that the feedback is electric
The both ends of appearance are connected；
The reverse input end of the operational amplifier is connected with the input terminal of the Current Voltage conversion module, the operation
The output end of amplifier is connected with the output end of Current Voltage conversion module；
The touch control unit is mutual capacitance, the positive input of the operational amplifier and the common electrical for providing common voltage
Pressure side is connected；Alternatively, the touch control unit is self-capacitance, positive input and the touch-control drive signal end of the operational amplifier
It is connected, the touch-control drive signal end is for providing touch-control drive signal, and the touch-control drive signal is in the two neighboring touch-control stage
Opposite in phase.
Preferably, second gating switch is additionally operable in the resetting sub-stage, by the first end of the storage capacitance
It is connected with the reverse input end of the operational amplifier.
Preferably, the environment measuring signal that the environmental detection sensor generates is current signal,
The transmission module includes third gating switch, and the third gating switch is used in the sub- rank of the comprehensive detection
Section, the second input terminal of the detection circuit is connected with the input terminal of the Current Voltage conversion module；And in the touch-control
Sub-stage is detected to disconnect the input terminal of the second input terminal of the detection circuit and the Current Voltage conversion module.
Correspondingly, the present invention also provides a kind of driving methods of above-mentioned detection circuit, including：
In the touch control detection sub-stage in touch-control stage, the Current Voltage conversion module is according to the first of the detection circuit
The touch-control sensing current signal that input terminal receives exports first voltage signal；
It is institute according to the environment measuring signal that second input terminal receives in the comprehensive detection sub-stage in touch-control stage
It states Current Voltage conversion module and corresponding environment measuring current signal is provided, so that the Current Voltage conversion module is according to
The touch-control sensing current signal that environment measuring current signal is received with the first input end of the detection circuit is superimposed, output
Second voltage signal.
Preferably, the detection circuit is the detection circuit described in claim 2, and the driving method further includes：
In the resetting sub-stage in touch-control stage, reset voltage signal is provided for the first end of the storage capacitance；And by institute
State the both ends conducting of feedback capacity.
Preferably, the first end for the storage capacitance provides reset voltage signal, including：By the of the storage capacitance
One end is connected with reset voltage end；Alternatively, by the reverse input end of the first end of the storage capacitance and the operational amplifier
Conducting.
Correspondingly, the present invention also provides a kind of touch device, including touch base plate, the touch base plate includes touch control unit
And environmental detection sensor；The environmental detection sensor is used to detect signal according to environmental information build environment；Its feature exists
In the touch device further includes detection circuit and data processing module, and the detection circuit is above-mentioned detection circuit, the number
It is used for the touch control detection sub-stage and comprehensive detection sub-stage according to the detection circuit in the touch-control stage according to processing module
The difference of the voltage signal exported obtains the environmental information that the environmental detection sensor detects.
In the present invention, in the touch control detection sub-stage in touch-control stage, Current Voltage conversion module only receives touch-control sense
Induced current signal, and the touch-control sensing current signal is converted into first voltage signal；And in the comprehensive detection in touch-control stage
Stage, transmission module provide accordingly according to the environment measuring signal that second input terminal receives for Current Voltage conversion module
Environment measuring current signal so that Current Voltage transmission module receive environment measuring current signal and touch-control sensing electricity
The superposition of signal is flowed, and then exports second voltage, and there are certain differences between the second voltage and first electrode, at this point,
The data processing module of rear end is that can determine the size of the environment measuring current signal, and then determine environment letter according to the difference
Breath.It can be seen that the detection electric current of the present invention only needs a Current Voltage conversion module that touch control detection and environment inspection can be realized
It surveys, simplifies the overall structure of detection circuit；And Current Voltage conversion module is when being integrated on chip, touch control unit and environment inspection
Survey sensor only need the same connection pin to be connected with Current Voltage conversion module, reduction touch base plate and detection circuit integrate
Complexity.In addition, touch control detection and environment measuring can carry out in the same touch-control stage, therefore detection time will not be caused
Increase.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, an and part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the connection diagram of the touch control detection circuit and touch control unit in an embodiment；
Fig. 2 is the connection diagram of environment detection circuit and environmental detection sensor in an embodiment；
Fig. 3 is the connection signal of the detection circuit and touch control unit and environmental detection sensor that are provided in the embodiment of the present invention
Figure；
Fig. 4 is the signal timing diagram of the detection circuit in Fig. 3；
Fig. 5 is another structural schematic diagram of the detection circuit of the present invention；
Fig. 6 is the signal timing diagram of the detection circuit in Fig. 5；
Fig. 7 is the another structural schematic diagram of the detection circuit of the present invention；
Fig. 8 is the signal timing diagram of the detection circuit in Fig. 7.
Wherein, reference numeral is：
11、12、21：Current Voltage conversion module；13,22, transmission module；13, environmental detection sensor；pin、pin1、
pin2：Connect pin；sw1：First gating switch；sw2：Second gating switch；sw3：Third gating switch；sw4：First resetting
Switch；sw5：Second Resetting Switching；OP：Operational amplifier；Ct：Touch control unit；Cs：Storage capacitance；Cf：Feedback capacity；VREF：
Reference voltage end；VRST：Reset voltage end；Vcom：Common voltage terminal.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched
The specific implementation mode stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
In touch device, touch base plate includes being touched by what multiple touch drive electrodes and multiple touch-control sensing electrodes were formed
Unit is controlled, when carrying out touch control detection, drives capacitance to provide touch-control drive signal for touch-control, to be produced on touch-control sensing electrode
Raw corresponding touch-control sensing signal.When touch-control occurs, the size of touch control unit changes, so that touch-control sensing electrode
On touch-control sensing signal change.Touch control unit is specifically as follows touch control capacitance, and Fig. 1 is the touch control detection in an embodiment
The connection diagram of circuit and touch control capacitance, as shown in Figure 1, Ct is the touch control capacitance formed on touch base plate, touch control detection electricity
Road includes the Current Voltage conversion module 11 being integrated on chip, and Current Voltage conversion module 11 is by connecting pin pin1 connections
The touch-control sensing electrode of touch control capacitance Ct, to receive touch-control sensing current signal corresponding with touch control capacitance Ct sizes.Electric current electricity
The touch-control sensing current signal for flowing into its input terminal is converted to voltage signal, and the data processing of rear end by pressure conversion module 11
Module (not shown) exports, which judges whether the size of touch control capacitance changes according to voltage signal, and then really
Determine position of touch.Certainly, touch control electrode Ct can be self-capacitance, at this point, the touch drive electrode of touch control capacitance Ct and touch-control sense
Electrode is answered to be formed as one.
It is detected to carry out environmental parameter (temperature, light luminance etc.), can be examined with the integration environment on touch base plate
Sensor 13 is surveyed, environmental detection sensor 13 is used to detect signal according to environmental parameter build environment, at this time, it may be necessary to have corresponding
Environment measuring circuit.When environment measuring signal is current signal, the connection of environment measuring circuit and environmental detection sensor 13
Schematic diagram is as shown in Fig. 2, environment measuring circuit 13 includes the Current Voltage conversion module 12 being integrated on chip, the Current Voltage
Conversion module 12 is connected by pin pin2 with environmental detection sensor 13, and environment measuring signal is converted to corresponding voltage
The data processing module of signal rear end exports, so that data processing module determines that environment is believed according to the voltage signal received
Breath.
It can be seen that by Fig. 1 and Fig. 2 when being integrated with environmental detection sensor 13 on touch base plate, on touch base plate
The cabling quantity and connection number of pin for being connected to chip will increase, and be answered with what detection circuit integrated to increase touch base plate
Miscellaneous degree.And if environment measuring and touch control detection are shared the same detection circuit in a manner of timesharing, it will cause when detection
Between increase, cause output-response slack-off.In addition, when touch device is embedded (in-cell) formula structure, then also result in aobvious
Show that the time shortens.
In view of this, the present invention provides a kind of detection circuit, in touch device, the touch device to include touch-control base
Plate, the touch base plate include touch control unit and environmental detection sensor, the present invention by taking touch control unit is touch control capacitance as an example into
Row explanation.The environmental detection sensor is used to detect signal according to environmental information build environment；Fig. 3 is in the embodiment of the present invention
The schematic diagram of the detection circuit and touch control unit and environmental detection sensor of offer.As shown in figure 3, the detection circuit includes the
One input terminal, the second input terminal, Current Voltage conversion module 21 and transmission module 22.
The first input end is for connecting touch control unit Ct, to receive touch-control sensing corresponding with touch control unit Ct sizes
Current signal.Second input terminal is used for the output end of JA(junction ambient) detection sensor 13.Transmission module 22 is used in touch-control
The comprehensive detection sub-stage in stage, the environment measuring signal received according to the second input terminal are that Current Voltage conversion module 21 carries
For corresponding environment measuring current signal；And in the touch control detection sub-stage in the touch-control stage, stop transmitting to Current Voltage
Module 21 provides signal.
The input terminal of Current Voltage conversion module 21 is connected with the first input end of the detection circuit, transmission module 22,
Current Voltage conversion module 21 after the current signal for flowing into its input terminal is converted to voltage signal for exporting.
Wherein, when carrying out touch control detection, the touch drive circuit of touch device provides touch-control drive signal Vtx, this is touched
Control drive signal Vtx is the square-wave signal converted between low and high level, and the driving stage is then that touch drive electrode receives
High level or low level period (the Tc stages in such as Fig. 4) are maintained to touch-control drive signal.In addition, touch control unit Ct can be with
For mutual capacitance, or self-capacitance.By taking mutual capacitance as an example, when carrying out touch control detection, touch drive electrode drives with touch-control
Circuit is connected, to receive the touch-control drive signal.
For the detection circuit of the present invention, in the touch control detection sub-stage (the t1 stages in such as Fig. 4) in touch-control stage, transmission
Module does not provide signal to Current Voltage transmission module 21, so that Current Voltage conversion module 21 only receives touch-control sense
Induced current signal, and the touch-control sensing current signal is converted into first voltage signal；And in the comprehensive detection in touch-control stage
Stage (the t2 stages in such as Fig. 4), transmission module 22 are electric current according to the environment measuring signal that second input terminal receives
Voltage transformation module 21 provides corresponding environment measuring current signal, so that Current Voltage transmission module 21 receives environment
The superposition of sensed current signal and touch-control sensing current signal, and then second voltage is exported, and the second voltage and first electrode
Between there are certain difference, at this point, the data processing module of rear end can determine the environment measuring electric current according to the difference
The size of signal, and then determine environmental information.It can be seen that the detection electric current of the present invention only needs a Current Voltage conversion module
Touch control detection and environment measuring can be realized, simplify the overall structure of detection circuit；And Current Voltage conversion module 21 is integrated
When on chip, touch control unit Ct and the same connection pin pin of 13 need of environmental detection sensor and Current Voltage modulus of conversion
Block 21 is connected, and reduces the integrated complexity of touch base plate and detection circuit.In addition, touch control detection and environment measuring can be same
A touch-control stage carries out, therefore will not cause the increase of detection time.
Below by taking touch control unit is mutual capacitance as an example, the detection circuit of the present invention is specifically introduced in conjunction with Fig. 3.Its
In, the environment measuring signal that environmental detection sensor 13 is generated can be voltage signal.
Specifically, in order to which voltage signal to be transferred to the input terminal of Current Voltage conversion module 21 in the form of electric current, such as
Shown in Fig. 3, transmission module 22 includes the first gating switch sw1, the second gating switch sw2 and storage capacitance Cs.Storage capacitance Cs
Second end and reference voltage end VREFIt is connected.First gating switch sw1 is for the charge accumulated in the comprehensive detection sub-stage
Period (the t21 stages in such as Fig. 4), the output end of environmental detection sensor 13 is connected with storage capacitance Cs, so that storage
The environment measuring signal that capacitance Cs receives the second input terminal of the detection circuit carries out charge storage.Second gating switch
Sw2 is for charge transfer time section (the t22 stages in such as Fig. 4) in comprehensive detection sub-stage, by the of storage capacitance Cs
One end is connected with the input terminal of Current Voltage conversion module 21, so that storage capacitance Cs stored charges are shifted to Current Voltage
Module 21 exports.Also, in the electric charge accumulating time section, the second gating switch sw2 can be by the first end of storage capacitance Cs
It is disconnected with the input terminal of Current Voltage conversion module 21；In the charge transfer time section, the first gating switch sw1 can be by ring
The output end of border detection sensor 13 is disconnected with storage capacitance Cs.
Wherein, the first gating switch sw1 and the second gating switch sw2 can be controlled for metal-oxide-semiconductor, single knife switch etc. and be led
The switching device of logical state.
Further, the detection circuit further includes the first Resetting Switching sw4, the input terminal of the first Resetting Switching sw4 with
Reset voltage end VRSTIt is connected, output end is connected with the first end of storage capacitance Cs, for the sub- rank of resetting in the touch-control stage
Section (the t0 stages in such as Fig. 4), by the first end of storage capacitance Cs and reset voltage end VRSTConducting.Wherein, reset voltage end
VRSTThe voltage provided can be configured according to actual needs.As shown in figure 4, resetting sub-stage can be touch-control stage (Tc
Stage) in close on period of end, between each touch-control stage starts, to the voltage between the both ends storage capacitance Cs
It is reset, to prevent testing result from being influenced by the upper touch-control stage.
Current Voltage conversion module 21 may include integrator, specifically include operational amplifier OP, feedback capacity Cf and
Two Resetting Switching sw5.The both ends of feedback capacity Cf are connected with the reverse input end of operational amplifier OP and output end respectively.Second
Resetting Switching sw5 is connected with the both ends of feedback capacity Cf, for the both ends of feedback capacity Cf to be connected in the resetting sub-stage,
To be reset to feedback capacity Cf.The input terminal of the reverse input end and Current Voltage conversion module 21 of operational amplifier OP
It is connected, the positive input of operational amplifier OP is connected with the common voltage terminal Vcom for providing common voltage, operational amplifier OP
Output end be connected with the output end OUT of Current Voltage conversion module.
Wherein, the common voltage that common voltage terminal Vcom is provided can be with reference voltage end VREFVoltage it is identical, can also
For the voltage of other fixed values.
The operation principle of the detection circuit of the present invention is introduced with reference to Fig. 3 and Fig. 4.Wherein, the first gating is opened
The ON OFF state for closing sw1, the second gating switch sw2, the first Resetting Switching sw4 and the second Resetting Switching sw5 can be by driving
Dynamic circuit provides control signal to control.In Fig. 4, the first gating switch sw1 and second is gated ck1 and ck2 in order to control respectively
The control of the first Resetting Switching sw4 and the second Resetting Switching sw5 are believed in order to control respectively by the control signal of switch sw2, ck4 and ck5
Number, each switch is connected under the control of high level signal, is disconnected under low level signal control.
In the resetting sub-stage (t0 stages) in upper touch-control stage, the first Resetting Switching sw4 is by the first of storage capacitance Cs
End and reset voltage end VRSTConducting, to be reset to the current potential of storage capacitance Cs first ends.Also, the second Resetting Switching Sw5 is led
It is logical, to be reset to feedback capacity Cf so that the current potential at the both ends feedback capacity Cf with the voltage phase of common voltage terminal Vcom
Together.In the resetting sub-stage, the first gating switch sw1 can be connected, can also disconnect.
Into after next touch-control stage (Tc stages), the second Resetting Switching sw5 is disconnected；Touch-control drive signal Vtx current potentials change
Become, to generate touch-control sensing current signal, touch-control sensing current signal is transmitted to electric current by the second input terminal of detection circuit
Voltage transformation module 21 is run up on feedback capacity Cf.In touch control detection sub-stage (t1 stages), the second gating switch sw2 is disconnected
It opens, Current Voltage transmission module 21 receives only touch-control sensing current signal, to export first voltage signal V1.In the touch-control
Sub-stage (t1 stages) is detected, the first Resetting Switching sw4 can be connected, can also disconnect；First gating switch sw1 can also be led
It is logical, or disconnect.
Later, in the comprehensive detection sub-stage in touch-control stage (t2 stages), transmission module 22 is according to environment measuring signal
Current Voltage conversion module 21 provides environment measuring current signal.
Specifically, in the electric charge accumulating time section of comprehensive detection sub-stage (t21 stages), the first Resetting Switching sw4 is disconnected,
Environmental detection sensor 13 is connected first gating switch sw1 with the first end of storage capacitance Cs, to storage capacitance Cs into
Row charge and discharge carry out charge accumulation.Second gating switch sw2 is still remained open, and Current Voltage converting unit 21 keeps output
First voltage signal V1.
Charge transfer time section (t22 stages) after electric charge accumulating time section, the first gating switch sw1 are disconnected, the
Two gating switch sw2 are connected, and for the charge accumulated on storage capacitance Cs to feedback capacity Cf feed-ins, Current Voltage conversion module 21 is defeated
Go out second voltage signal V2, there are difference △ V between the second voltage signal V2 and first voltage signal V1.At the data of rear end
Reason module can determine the difference △ V calculating or by way of common mode detection, so that it is determined that environmental detection sensor 13
The environment measuring signal of generation, and then determine current environmental information.
And then it is secondary into resetting sub-stage, it repeats the above process.
Fig. 5 is another structural schematic diagram of the detection circuit of the present invention, and Fig. 6 is the sequence diagram of the detection circuit of Fig. 5.Fig. 5
Detection circuit of the detection circuit compared to Fig. 3 difference lies in：In the detection circuit of Fig. 5, the second gating switch sw2 is not only
For the first end of storage capacitance Cs to be connected with the input terminal of Current Voltage conversion module 21 in charge transfer time section, also use
In the first end of storage capacitance Cs in the resetting sub-stage, to be connected to (control the with the reverse input end of operational amplifier OP
The control signal ck2 of two gating switch sw2 is as shown in Figure 6).Since in resetting sub-stage, the second Resetting Switching sw5 can be to anti-
The current potential that feed holds the both ends Cf is reset, and therefore, is acted in the conducting of resetting sub-stage by the second gating switch sw2, can
The current potential of storage capacitance Cs first ends to be reset to the current potential of feedback capacity Cf first ends (B points), also there is no need to independent again
First Resetting Switching and reset voltage end are set, to simplify circuit structure.
When the environment measuring signal that environmental detection sensor generates is voltage signal, the structure of detection circuit can be such as figure
Shown in 3 or Fig. 5；When environment measuring signal is current signal, the structure of detection circuit can be as shown in Figure 7.With such as Fig. 3 phases
More different than the structure for differing only in transmission module 22 of, detection circuit shown in Fig. 7, in the figure 7, transmission module 22 includes the
Three gating switch sw3, third gating switch sw3 are used in the comprehensive detection sub-stage, defeated by the second of the detection circuit
Enter end to be connected with the input terminal of Current Voltage conversion module 21；And it is disconnected in touch control detection sub-stage.The detection circuit of Fig. 7 when
As shown in figure 8, the control signal ck3 of control third gating switch sw3 in comprehensive sub-stage is high level, other stages are sequence figure
Low level, so that Current Voltage conversion module 21 receives touch-control sensing current signal in touch control detection sub-stage, output
First voltage signal；The cumulative of touch-control sensing current signal and environment measuring current signal is received in comprehensive detection sub-stage,
Export second voltage signal.
Above using touch control unit as mutual capacitance, for the various structures of detection circuit are described, certainly, touch-control list
Member or self-capacitance, when touch control unit is self-capacitance, above-mentioned touch drive electrode and touch drive electrode are formed as one
One end of body, i.e. self-capacitance electrode, self-capacitance electrode can be grounded, and the other end is connected with the first input end of detection circuit, and
The positive input connection touch-control drive signal end of above-mentioned operational amplifier is connected, and the touch-control drive signal end is above-mentioned for providing
Touch-control drive signal Vtx.It is identical when the testing principle of detection circuit is with above-mentioned mutual capacitance when touch control unit is self-capacitance, here
It repeats no more.
As another aspect of the present invention, a kind of driving method of above-mentioned detection circuit is provided, in conjunction with shown in Fig. 3 to Fig. 8,
Including：
In the touch control detection sub-stage (the t1 stages in such as Fig. 4, Fig. 6 and Fig. 8) of touch-control stage Tc, Current Voltage modulus of conversion
Block 21 exports first voltage signal according to the touch-control sensing current signal that the first input end of the detection circuit receives.
In the comprehensive detection sub-stage (the t2 stages in such as Fig. 4, Fig. 6 and Fig. 8) of touch-control stage Tc, 22 basis of transmission module
The environment measuring signal that second input terminal receives is that Current Voltage conversion module 21 provides corresponding environment measuring electric current
Signal, so that first input end of the Current Voltage conversion module 21 according to the environment measuring current signal and the detection circuit
The superposition of the touch-control sensing current signal received exports second voltage signal.
Further, the driving method further includes：In the resetting sub-stage (in such as Fig. 4, Fig. 6 and Fig. 8 in touch-control stage
The t0 stages), the both ends of feedback capacity Cf are connected, are reset with the current potential to the both ends feedback capacity Cf.
As it appears from the above, the transmission module 22 of detection circuit may include the first gating switch sw1, the second gating switch sw2
With storage capacitance Cs.At this moment, the driving method further includes：In resetting sub-stage, weight is provided for the first end of storage capacitance Cs
Set voltage signal.It reset voltage signal is provided can specifically include for the first end of the storage capacitance Cs：By storage electricity
Hold the first end and reset voltage end V of CsRSTConducting；Alternatively, by the reversed of the first end of storage capacitance Cs and operational amplifier OP
Input terminal is connected.
The course of work in each stage of detection circuit is described above, and which is not described herein again.
As another aspect of the invention, the present invention also provides a kind of touch device, including touch base plate, the touch-control base
Plate includes touch control unit, environmental detection sensor, detection circuit and data processing module.The environmental detection sensor is used for root
Signal is detected according to environmental information build environment.The detection circuit above-mentioned detection circuit provided by the invention, the data processing
Touch control detection sub-stage and comprehensive detection sub-stage of the module for according to the detection circuit in the touch-control stage are exported
Voltage signal difference, obtain the environmental information that the environmental detection sensor detects.
Since the above-mentioned detection circuit for carrying out touch control detection and environment measuring is simple in structure, number of pin is less, because
This, detection circuit is reduced with the complexity that touch base plate integrates, and to improve the integrated level of touch device, simplifies touch-control dress
The overall structure set.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, in the essence for not departing from the present invention
In the case of refreshing and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of detection circuit is used in touch device, the touch device includes touch base plate, and the touch base plate includes touching
Control unit and environmental detection sensor；The environmental detection sensor is used to detect signal according to environmental information build environment；Its
It is characterized in that,
The detection circuit includes first input end, the second input terminal, Current Voltage conversion module and transmission module,
The first input end is for connecting the touch control unit, to receive touch-control sensing corresponding with the touch control unit size
Current signal；Second input terminal is used to connect the output end of the environmental detection sensor；
The transmission module is for the comprehensive detection sub-stage in the touch-control stage, the environment received according to second input terminal
Detection signal provides corresponding environment measuring current signal for the Current Voltage conversion module；And touching in the touch-control stage
Control detection sub-stage, stops providing signal to the Current Voltage transmission module；
The input terminal of the Current Voltage conversion module is connected with the first input end of the detection circuit, the transmission module,
The Current Voltage conversion module after the current signal for flowing into its input terminal is converted to voltage signal for exporting.
2. detection circuit according to claim 1, which is characterized in that the environment measuring that the environmental detection sensor generates
Signal is voltage signal, and the transmission module includes the first gating switch, the second gating switch and storage capacitance；
First gating switch senses environment measuring for the electric charge accumulating time section in the comprehensive detection sub-stage
The output end of device is connected with the first end of the storage capacitance；And the charge transfer time in the comprehensive detection sub-stage
Section disconnects the first end of the output end of environmental detection sensor and the storage capacitance；
Second gating switch is used in the charge transfer time section, by the first end of the storage capacitance and the electric current
The input terminal of voltage transformation module is connected；And in the electric charge accumulating time section, by the first end of the storage capacitance with it is described
The input terminal of Current Voltage conversion module disconnects；
The second end of the storage capacitance is connected with reference voltage end.
3. detection circuit according to claim 2, which is characterized in that the transmission module further includes the first Resetting Switching,
First Resetting Switching is for the resetting sub-stage in the touch-control stage, by the first end of the storage capacitance and resetting electricity
Pressure side is connected.
4. detection circuit according to claim 2, which is characterized in that the Current Voltage conversion module includes operation amplifier
Device, feedback capacity and the second Resetting Switching,
The both ends of the feedback capacity are connected with the reverse input end of operational amplifier and output end respectively；
Second Resetting Switching is connected with the both ends of feedback capacity, in the resetting sub-stage by the feedback capacity
Both ends are connected；
The reverse input end of the operational amplifier is connected with the input terminal of the Current Voltage conversion module, the operation amplifier
The output end of device is connected with the output end of Current Voltage conversion module；
The touch control unit is mutual capacitance, the positive input of the operational amplifier and the common voltage terminal for providing common voltage
It is connected；Alternatively, the touch control unit is self-capacitance, positive input and the touch-control drive signal end phase of the operational amplifier
Even, the touch-control drive signal end is for providing touch-control drive signal, phase of the touch-control drive signal in the two neighboring touch-control stage
Position is opposite.
5. detection circuit according to claim 4, which is characterized in that second gating switch is additionally operable in the resetting
The first end of the storage capacitance is connected sub-stage with the reverse input end of the operational amplifier.
6. detection circuit according to claim 1, which is characterized in that the environment measuring that the environmental detection sensor generates
Signal is current signal,
The transmission module includes third gating switch, and the third gating switch is used in the comprehensive detection sub-stage, will
Second input terminal of the detection circuit is connected with the input terminal of the Current Voltage conversion module；And in touch control detection
Stage disconnects the input terminal of the second input terminal of the detection circuit and the Current Voltage conversion module.
7. a kind of driving method of detection circuit as described in any one of claim 1 to 6, which is characterized in that including：
In the touch control detection sub-stage in touch-control stage, the Current Voltage conversion module is according to the first of the detection circuit the input
Terminate the touch-control sensing current signal output first voltage signal received；
It is the electricity according to the environment measuring signal that second input terminal receives in the comprehensive detection sub-stage in touch-control stage
It flows voltage transformation module and corresponding environment measuring current signal is provided, so that the Current Voltage conversion module is according to the environment
The touch-control sensing current signal that sensed current signal is received with the first input end of the detection circuit is superimposed, output second
Voltage signal.
8. driving method according to claim 7, which is characterized in that the detection circuit is the inspection described in claim 2
Slowdown monitoring circuit, the driving method further include：
In the resetting sub-stage in touch-control stage, reset voltage signal is provided for the first end of the storage capacitance；And it will be described anti-
The both ends conducting that feed holds.
9. driving method according to claim 8, which is characterized in that provide resetting electricity for the first end of the storage capacitance
Signal is pressed, including：The first end of the storage capacitance is connected with reset voltage end；Alternatively, by the first of the storage capacitance
End is connected with the reverse input end of the operational amplifier.
10. a kind of touch device, including touch base plate, the touch base plate includes touch control unit and environmental detection sensor；Institute
Environmental detection sensor is stated for detecting signal according to environmental information build environment；It is characterized in that, the touch device also wraps
Detection circuit and data processing module are included, the detection circuit is the detection circuit described in any one of claim 1 to 6,
The data processing module is used for the touch control detection sub-stage and comprehensive detection in the touch-control stage according to the detection circuit
The difference for the voltage signal that sub-stage is exported obtains the environmental information that the environmental detection sensor detects.
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