CN103294297A - Signal processing and pre-amplification circuit and touch screen - Google Patents
Signal processing and pre-amplification circuit and touch screen Download PDFInfo
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- CN103294297A CN103294297A CN2012103851957A CN201210385195A CN103294297A CN 103294297 A CN103294297 A CN 103294297A CN 2012103851957 A CN2012103851957 A CN 2012103851957A CN 201210385195 A CN201210385195 A CN 201210385195A CN 103294297 A CN103294297 A CN 103294297A
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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
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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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
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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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
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
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Abstract
The invention discloses a signal processing and pre-amplification circuit and a touch screen. The signal processing and pre-amplification circuit is used for the touch screen, and comprises an offset current generation unit, a pre-amplifier and an feedback impedance, wherein the offset current generation unit is used for outputting offset current signals to eliminate background signals, at least in part, of pixel output current signals of the touch screen, and the background signals are the pixel output current signals under the condition of not touching the touch screen; the negative phase input end of the pre-amplifier is suitable for receiving the pixel output current signals and the offset current signals, and the positive phase input end is suitable for receiving reference voltage; and the feedback impedance is suitable for connecting the negative phase input end and the negative phase output end of the pre-amplifier. Through adopting the technical scheme of the invention, background signals in the pixel output current signals can be reduced or eliminated, so that the pre-amplifier can select the capacitance with a smaller value or a resistance with a smaller value to obtain greater gain. Through adopting the technical scheme of the invention, the feedback impedance (integrating capacitance or resistance) of the circuit of the pre-amplifier can be changed, so that the gain is adjusted to confirm to the actual need.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to a kind of signal processing and pre-amplification circuit and touch-screen.
Background technology
(Capacity Touch Panel CTP) mainly contains two kinds of self-capacitance induction type touch-screen and mutual capacitance induction type touch-screens to capacitive touch screen.
Mutual capacitance induction type touch-screen comprises many drive wires and many lines of induction, and drive wire and the line of induction intersect to be placed, in the infall formation mutual capacitance of drive wire and the line of induction.Mutual capacitance induction type touch-screen can comprise into the mutual capacitance of array arrangement.
Drive wire sends pulse signal, and the line of induction produces current signal by the described pulse signal of induction.When mutual capacitance induction type touch-screen is not touched, the background signal that line of induction output is stable, described background signal is converted into stable charge signal through behind the charge amplifier circuit, and stable charge signal is converted into stable output voltage through after the bandpass filter.When human body contact touch-screen, because human body grounding, finger just forms an equivalent capacity with touch-screen, the pulse signal that drive wire sends can pass through this equivalent capacity inflow place, like this, the line of induction produces current signal and changes, and the final output voltage that produces also changes, and touch operation is detected.
As shown in the above, the line of induction of mutual capacitance induction type touch-screen produces background signal when touch-screen is not touched, and after touch-screen was touched, the line of induction produced the current signal that is superimposed with described background signal.In described current signal, be only the current value of actual embodiment touch signal with respect to the electric current changing unit of background signal.
Charge amplifier circuit is actually a kind of concrete application of integrating circuit.Charge amplifier circuit can carry out Integral Processing to the current signal that receives, and produces corresponding charge signal.The capacitance of the integrating capacitor of charge amplifier circuit is more little, and output voltage is more big, and it is more big to gain.
In order to increase output voltage, obtain bigger gain, the integrating capacitor of charge amplifier circuit need arrange less capacitance.But the current value of described background signal is often bigger, if the capacitance of the integrating capacitor in the charge amplifier circuit is less, then charge amplifier circuit is easy to saturated.After charge amplifier circuit was saturated, no matter whether touch-screen was touched, and output voltage can not change, and touch operation can't be detected.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is that existing charge amplifier circuit can't satisfy touch-screen and detects required.
For this reason, the embodiment of the invention adopts following technical scheme:
A kind of signal is handled and pre-amplification circuit, is used for touch-screen, comprising:
Compensation current generating unit is suitable for exporting compensating current signal, and with at least part of background signal in the pixel output current signal of eliminating described touch-screen, described background signal is the pixel output current signal when not being touched;
Prime amplifier, negative-phase input are suitable for receiving described pixel output current signal and compensating current signal, and normal phase input end is suitable for receiving reference voltage;
Feedback impedance is suitable for connecting negative-phase input and the output terminal of described prime amplifier.
Optionally, described compensation current generating unit comprises:
Storage unit is suitable for storing the background signal of all pixel correspondences in the described touch-screen;
Current output unit is suitable for searching from described storage unit according to the coordinate of current pixel point the background signal of this pixel correspondence, and produces compensating current signal according to the background signal that finds;
Electric charge feed-in impedance is suitable for described compensating current signal is exported to the negative-phase input of described prime amplifier.
Optionally, described current output unit is suitable for searching among the LOOKUP TABLE of coordinate from storage unit according to current pixel point the background signal of this pixel correspondence.
Optionally, described prime amplifier is charge amplifier, and described electric charge feed-in impedance and feedback impedance are realized by electric capacity;
Perhaps, described prime amplifier is voltage amplifier or current-voltage converter, and described electric charge feed-in impedance and feedback impedance are realized by resistance.
Optionally, the waveform of the background signal of described all pixel correspondences of cell stores or integral charge amount.
Optionally, the actual waveform of the background signal of described all pixel correspondences of cell stores or the compressed format of actual waveform.
Optionally, described prime amplifier is charge amplifier, and described compensating current signal is synchronous with background signal and phase place is opposite, the integral charge of described compensating current signal be described background signal integral charge 0.5-1.5 doubly.
Optionally, described prime amplifier is voltage amplifier or current-to-voltage converter, and described compensating current signal is synchronous with background signal and phase place is opposite, and compensating current signal F2i and background signal F1i satisfy:
Optionally, described signal is handled and pre-amplification circuit also comprises: at least one road feedback branch; Each road feedback branch in the feedback branch of described at least one road all is arranged between the negative-phase input and output terminal of described prime amplifier;
The described feedback branch in each road comprises: the switch of serial connection and branch road feedback impedance.
A kind of signal is handled and pre-amplification circuit, is used for touch-screen, comprising:
Prime amplifier, negative-phase input are suitable for receiving described touch-screen pixel output current signal, and normal phase input end is suitable for receiving reference voltage;
Feedback impedance is suitable for connecting negative-phase input and the output terminal of described prime amplifier;
At least one road feedback branch, wherein each road feedback branch all is arranged between the negative-phase input and output terminal of described prime amplifier, and described each road feedback branch comprises: the switch of serial connection and branch road feedback impedance.
Optionally, described prime amplifier is charge amplifier, and described feedback impedance and branch road feedback impedance are realized by electric capacity;
Perhaps, described prime amplifier is voltage amplifier or current-voltage converter, and described feedback impedance and branch road feedback impedance are realized by resistance.
Optionally, described signal is handled and pre-amplification circuit also comprises: compensation current generating unit, be suitable for exporting compensating current signal, eliminating at least part of background signal in the described pixel output current signal, described background signal is the pixel output current signal when not being touched;
The negative-phase input of described prime amplifier also is suitable for receiving described compensating current signal.
Optionally, described compensation current generating unit comprises:
Storage unit is suitable for storing the background signal of all pixel correspondences in the described touch-screen;
Current output unit is suitable for searching from described storage unit according to the coordinate of current pixel point the background signal of this pixel correspondence, and produces compensating current signal according to the background signal that finds;
Electric charge feed-in impedance is suitable for described compensating current signal is exported to the negative-phase input of described prime amplifier.
Optionally, described current output unit is suitable for searching among the LOOKUP TABLE of coordinate from storage unit according to current pixel point the background signal of this pixel correspondence.
Optionally, described prime amplifier is charge amplifier, and described electric charge feed-in impedance and feedback impedance are realized by electric capacity;
Perhaps, described prime amplifier is voltage amplifier or current-voltage converter, and described electric charge feed-in impedance and feedback impedance are realized by resistance.
Optionally, described prime amplifier is charge amplifier, and described compensating current signal is synchronous with background signal and phase place is opposite, the integral charge of described compensating current signal be described background signal integral charge 0.5-1.5 doubly.
Optionally, described prime amplifier is voltage amplifier or current-to-voltage converter, and described compensating current signal is synchronous with background signal and phase place is opposite, and compensating current signal F2i and background signal F1i satisfy:
A kind of touch-screen comprises above-mentioned signal processing and pre-amplification circuit.
Optionally, described touch-screen comprises many drive wires and many lines of induction, and described signal processing and pre-amplification circuit are electrically connected with the described line of induction.
Optionally, described drive wire and the described line of induction are positioned at different layers, and separate by an insulation course between the two.
Optionally, described drive wire and the described line of induction are positioned at same one deck.
Optionally, a corresponding described signal processing and pre-amplification circuit of connecting of the line of induction.
Optionally, all lines of induction are connected to a described signal processing and pre-amplification circuit jointly.
Compared with prior art, there is following advantage in technical solution of the present invention:
The employing technical solution of the present invention can reduce or remove the background signal in the pixel output current, makes preamplifier circuit can select for use the electric capacity of littler value or resistance to obtain bigger gain.
Adopt technical solution of the present invention can change the feedback impedance (integrating capacitor or resistance) of preamplifier circuit, thereby adjust gain, make it realistic required.
Description of drawings
Fig. 1 is a structural representation of the processing of the embodiment of the invention one signal and pre-amplification circuit;
Fig. 2 is the synoptic diagram of pixel output current signal of the present invention;
Fig. 3 is another structural representation of the processing of the embodiment of the invention one signal and pre-amplification circuit;
Synoptic diagram when Fig. 4 is stored for background signal of the present invention;
Fig. 5 is the another structural representation of the processing of the embodiment of the invention one signal and pre-amplification circuit;
Fig. 6 concerns synoptic diagram for one of pixel output current signal of the present invention and compensating signal;
Fig. 7 concerns synoptic diagram for another of pixel output current signal of the present invention and compensating signal;
Fig. 8 is a structural representation of the processing of embodiment of the invention binary signal and pre-amplification circuit;
Fig. 9 is another structural representation of the processing of embodiment of the invention binary signal and pre-amplification circuit;
Figure 10 is a structural representation of the processing of the embodiment of the invention three signals and pre-amplification circuit;
Figure 11 is another structural representation of the processing of the embodiment of the invention three signals and pre-amplification circuit;
Figure 12 is a structural representation of touch-screen of the present invention;
Figure 13 is another structural representation of touch-screen of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.In the following passage, with way of example the present invention is described more specifically with reference to accompanying drawing.According to following explanation, advantages and features of the invention will be clearer.
As shown in Figure 1, the embodiment of the invention one provides a kind of signal to handle and pre-amplification circuit, described signal is handled and pre-amplification circuit is used for touch-screen 5, comprise: compensation current generating unit 1, be suitable for exporting compensating current signal A2, eliminating at least part of background signal among the pixel output current signal A1, the pixel output current signal of described background signal touch-screen 5 when not touching; Prime amplifier 3, negative-phase input are suitable for receiving described pixel output current signal A1 and compensating current signal A2, and normal phase input end is suitable for receiving reference voltage VF(and is generally earth terminal); Feedback impedance 4 is suitable for connecting negative-phase input and the output terminal of described prime amplifier 3.
Touch-screen 5 can be the touch-screen of mutual capacitance induction type.Mutual capacitance induction type touch-screen comprises many drive wires and many lines of induction, and drive wire and the line of induction intersect to be placed, and the infall of drive wire and the line of induction forms pixel, i.e. mutual capacitance.Concrete, so mutual capacitance induction type touch-screen comprises into the mutual capacitance of array arrangement.
For example, the touch-screen among Fig. 15 comprises first drive wire 52, second drive wire 53, first line of induction 54 and second line of induction 55.The infall of first drive wire 52 and first line of induction 54 forms first pixel 524; The infall of first drive wire 52 and second line of induction 55 forms second pixel 525; The infall of second drive wire 53 and first line of induction 54 forms the 3rd pixel 534; The infall of second drive wire 53 and second line of induction 55 forms the 4th pixel 535; Described first pixel 524, second pixel 525,535 one-tenth arrays of the 3rd pixel 534 and the 4th pixel are arranged.
Fig. 2 shows the relation between the pixel output current signal when not touching and touching.As can be seen from Figure 2, during touch the pixel output current signal can be when not touching the amplitude of pixel output current signal big, can be when not touching yet the amplitude of pixel output current signal little.
As shown in Figure 3, described compensation current generating unit 1 can comprise: storage unit 11 is suitable for storing the background signal of all pixel correspondences in the described touch-screen; Current output unit 12 is suitable for searching from described storage unit according to the coordinate of current pixel point the background signal of this pixel correspondence, and produces compensating current signal A2 according to the background signal that finds; Electric charge feed-in impedance 2 is suitable for described compensating current signal A2 is exported to the negative-phase input of described prime amplifier.
For each pixel, storage unit 11 has been stored the coordinate of this pixel, and corresponding background signal.That is to say that can find out the background signal of described pixel correspondence according to the coordinate of pixel, described corresponding relation can be realized by mapping table LOOKUP TABLE.Described coordinate can define according to drive wire and the line of induction at described pixel place.For example, first coordinate at first pixel, 524 places is (4,2) among Fig. 1, and second coordinate at second pixel, 525 places is (5,2), and the three-dimensional at the 3rd pixel 534 places is (4,3), and the 4-coordinate at the 4th pixel 535 places is (5,3).
Continuation is with reference to figure 3, and current output unit 12 is searched the background signal of this pixel correspondence in can the LOOKUP TABLE of coordinate from storage unit 11 according to current pixel point.Concrete, current output unit 12 is determined the coordinate of the pixel of current generation pixel output current signal, from storage unit 11, search the background signal of this pixel correspondence according to the coordinate of this pixel, and produce compensating current signal according to the background signal that finds.Current output unit 12 can be determined the coordinate of the pixel of current generation pixel output current signal according to the touch-screen driving circuit.Scanning sequency as described four pixels of Fig. 1 of driving circuit setting is respectively: first pixel 524 and second pixel, 525, the three pixels 534 and the 4th pixel 535.After first drive wire 52 received and drives signal, first pixel 524 was by the negative-phase input output current signal of first line of induction 54 to prime amplifier 3; Second pixel 525 is by the negative-phase input output current signal of second line of induction 55 to prime amplifier 3.After second drive wire 53 received and drives signal, the 3rd pixel 534 was by the negative-phase input output current signal of first line of induction 54 to prime amplifier 3; The 4th pixel 535 is by the negative-phase input output current signal of second line of induction 55 to prime amplifier 3.When the pixel of current negative-phase input output current to prime amplifier 3 was first pixel 524, current output unit 12 was the background signal that (4,2) search first pixel 524 according to first coordinate.
As shown in Figure 5, described prime amplifier 3 can be charge amplifier 31.When prime amplifier 3 was charge amplifier, electric charge feed-in impedance 2 realized that by electric charge feed-in capacitor C ref feedback impedance 4 is realized by the first capacitor C f1.When prime amplifier 3 was charge amplifier, described compensating current signal was synchronous with background signal and phase place is opposite, the integral charge of described compensating current signal be described background signal integral charge 0.5-1.5 doubly.
As shown in Figure 6, the amplitude of pixel output current signal is big to suppose pixel output current signal when touching when not touching, and the integral charge of pixel output current signal is not the integral charge of background signal when touching.Compensation current generating unit 1 can produce first compensating current signal, described first compensating current signal is a square-wave pulse signal, this square-wave pulse signal pixel output current signal when not touching is synchronous and phase place is opposite, the integral charge of this square-wave pulse signal be background signal integral charge 1-1.5 doubly, under this condition, at least part of background signal in the pixel output current signal is eliminated, the first capacitor C f1 can select the less electric capacity of capacitance for use, thereby obtains bigger gain.Compensation current generating unit 1 also can produce second compensating current signal, the phase place opposite signal that described second compensating current signal is described background signal, both are synchronous and integral charge is identical, under this condition, whole background signals in the pixel output current signal are eliminated, the first capacitor C f1 can select the less electric capacity of capacitance equally for use, thereby obtains bigger gain.
As shown in Figure 7, the amplitude of pixel output current signal is little to suppose pixel output current signal when touching when not touching, and the integral charge of pixel output current signal is not the integral charge of background signal when touching.Compensation current generating unit 1 can produce first compensating current signal, described first compensating current signal is a square-wave pulse signal, this square-wave pulse signal pixel output current signal when not touching is synchronous and phase place is opposite, the integral charge of this square-wave pulse signal be background signal integral charge 0.5-1 doubly, under this condition, at least part of background signal in the pixel output current signal is eliminated, the first capacitor C f1 can select the less electric capacity of capacitance for use, thereby obtains bigger gain.Compensation current generating unit 1 also can produce second compensating current signal, the phase place opposite signal that described second compensating current signal is described background signal, both are synchronous and integral charge is identical, under this condition, whole background signals in the pixel output current signal are eliminated, the first capacitor C f1 can select the less electric capacity of capacitance equally for use, thereby obtains bigger gain.
Described prime amplifier 3 can also be realized by voltage amplifier or current-voltage converter.When prime amplifier 3 was current amplifier, electric charge feed-in impedance 2 and feedback impedance 4 realized that by resistance compensating current signal F2i is synchronous with background signal F1i and phase place is opposite, and formula below satisfying:
Satisfying under the condition recited above, at least part of background signal in the pixel output current signal can be eliminated.
As shown in Figure 8, the embodiment of the invention two provides a kind of signal to handle and pre-amplification circuit, and described signal is handled and pre-amplification circuit, is used for touch-screen 5, comprising:
Feedback impedance 4 is suitable for connecting negative-phase input and the output terminal of described prime amplifier 3;
At least one road feedback branch, wherein each road feedback branch 6 all is arranged between the negative-phase input and output terminal of described prime amplifier 3, and described each road feedback branch comprises: the switch 61 of serial connection and branch road feedback impedance 62.
Embodiment two described touch-screens can be the touch-screen of mutual capacitance induction type.Content about the touch-screen of capacitor induction type can repeat no more with reference to the description of embodiment one herein.
This sentences feedback branch and is one and schematically illustrates, but is understandable that the quantity of described feedback branch can be one, two, three or more.Branch road feedback impedance 62 in the feedback branch can be identical, also can be different.As shown in Figure 9, described prime amplifier 3 can be charge amplifier 31, and switch 61 can be the first MOS transistor S1.When prime amplifier 3 was charge amplifier, feedback impedance 4 realized that by the first capacitor C f1 branch road feedback impedance 62 is realized by the second capacitor C f2.
When the first MOS transistor S1 ended, the negative-phase input of prime amplifier 3 only connected the output terminal of prime amplifier 3 by the first capacitor C f1, and under this situation, charge amplifier 31 and the first capacitor C f1 form first charge amplifier circuit.
During the first MOS transistor S1 conducting, the second capacitor C f2 and the first capacitor C f1 parallel connection, the negative-phase input of prime amplifier 3 is connected the output terminal of prime amplifier 3 with the first capacitor C f1 by the second capacitor C f2 in parallel, under this situation, charge amplifier 31, the first capacitor C f1 and the second capacitor C f2 form second charge amplifier circuit.The integrating capacitor of second charge amplifier circuit is compared with the capacitance of the integrating capacitor of first charge amplifier circuit and is changed.Can adjust gain and signal to noise ratio (S/N ratio) by the integrating capacitor that changes, it is required to make it satisfy practical design.
As shown in figure 10, the embodiment of the invention three provides a kind of signal to handle and pre-amplification circuit, described signal is handled and pre-amplification circuit is used for touch-screen 5, comprising: compensation current generating unit 1, prime amplifier 3, feedback impedance 4 and at least one road feedback branch.Each road feedback branch 6 in the feedback branch of described at least one road all is arranged between the output terminal of the negative-phase input of described prime amplifier 3 and prime amplifier 3; The described feedback branch 6 in each road comprises: the switch 61 of serial connection and branch road feedback impedance 62.
The specific descriptions of compensation current generating unit 1, prime amplifier 3, feedback impedance 4 and touch-screen 5 can reference example one, can reference examples two about the specific descriptions of feedback branch 6, repeat no more herein.
As shown in figure 11, compensation current generating unit 1 comprises: storage unit 11 is suitable for storing the background signal of all pixel correspondences in the described touch-screen; Current output unit 12 is suitable for searching from described storage unit according to the coordinate of current pixel point the background signal of this pixel correspondence, and produces compensating current signal according to the background signal that finds; Electric charge feed-in impedance 2 is suitable for described compensating current signal is exported to the negative-phase input of described prime amplifier.Described prime amplifier 3 is charge amplifier 31, and switch 61 is the first MOS transistor S1, and electric charge feed-in impedance 2, feedback impedance 4 and branch road feedback impedance 62 are electric capacity.
When described prime amplifier was voltage amplifier or current-voltage converter, electric charge feed-in impedance 2, feedback impedance 4 and branch road feedback impedance 62 were resistance.
Need to prove, more than among all embodiment, the output terminal of pre-amplification circuit can also be connected in series a bandpass filter.
Technical solution of the present invention also provides a kind of touch-screen, comprises the described signal processing of above-described embodiment and pre-amplification circuit.
Optionally, described touch-screen comprises many drive wires and many lines of induction, and described signal processing and pre-amplification circuit are electrically connected with the described line of induction.Concrete, the negative-phase input of the prime amplifier of signal processing and pre-amplification circuit is electrically connected with the line of induction by the current output terminal of pixel.
Optionally, described drive wire and the described line of induction are positioned at different layers, and separate by an insulation course between the two.Described drive wire and the described line of induction are positioned at same one deck.
Optionally, described signal is handled and pre-amplification circuit can be positioned at the substrate at drive wire and line of induction place, also can described substrate outside.
Optionally, all lines of induction can be connected to a described signal jointly and handle and pre-amplification circuit, as shown in figure 12.Wherein, the every line of induction is connected switch 51 closures during line of induction output current signal by a switch 51 with signal processing and pre-amplification circuit.At this moment, the scan mode of all pixels is: drive wire is lined by line scan, and the line of induction is by the row output current signal.
Optionally, a line of induction can correspondingly connect a described signal to be handled and pre-amplification circuit, as shown in figure 13.At this moment, the scan mode of all pixels is: drive wire is lined by line scan, the line of induction output current signal that walks abreast.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (23)
1. a signal is handled and pre-amplification circuit, is used for touch-screen, it is characterized in that, comprising:
Compensation current generating unit is suitable for exporting compensating current signal, and with at least part of background signal in the pixel output current signal of eliminating described touch-screen, described background signal is the pixel output current signal when not being touched;
Prime amplifier, negative-phase input are suitable for receiving described pixel output current signal and compensating current signal, and normal phase input end is suitable for receiving reference voltage;
Feedback impedance is suitable for connecting negative-phase input and the output terminal of described prime amplifier.
2. signal as claimed in claim 1 is handled and pre-amplification circuit, it is characterized in that described compensation current generating unit comprises:
Storage unit is suitable for storing the background signal of all pixel correspondences in the described touch-screen;
Current output unit is suitable for searching from described storage unit according to the coordinate of current pixel point the background signal of this pixel correspondence, and produces compensating current signal according to the background signal that finds;
Electric charge feed-in impedance is suitable for described compensating current signal is exported to the negative-phase input of described prime amplifier.
3. signal as claimed in claim 2 is handled and pre-amplification circuit, it is characterized in that, described current output unit is suitable for searching among the LOOKUP TABLE of coordinate from storage unit according to current pixel point the background signal of this pixel correspondence.
4. signal as claimed in claim 2 is handled and pre-amplification circuit, it is characterized in that described prime amplifier is charge amplifier, and described electric charge feed-in impedance and feedback impedance are realized by electric capacity;
Perhaps, described prime amplifier is voltage amplifier or current-voltage converter, and described electric charge feed-in impedance and feedback impedance are realized by resistance.
5. signal as claimed in claim 2 is handled and pre-amplification circuit, it is characterized in that the waveform of the background signal of all pixel correspondences of described cell stores or integral charge amount.
6. signal as claimed in claim 5 is handled and pre-amplification circuit, it is characterized in that the actual waveform of the background signal of all pixel correspondences of described cell stores or the compressed format of actual waveform.
7. signal as claimed in claim 1 is handled and pre-amplification circuit, it is characterized in that, described prime amplifier is charge amplifier, described compensating current signal is synchronous with background signal and phase place is opposite, the integral charge of described compensating current signal be described background signal integral charge 0.5-1.5 doubly.
8. signal as claimed in claim 1 is handled and pre-amplification circuit, it is characterized in that, described prime amplifier is voltage amplifier or current-to-voltage converter, and described compensating current signal is synchronous with background signal and phase place is opposite, and compensating current signal F2i and background signal F1i satisfy:
9. signal as claimed in claim 1 is handled and pre-amplification circuit, it is characterized in that, also comprises: at least one road feedback branch; Each road feedback branch in the feedback branch of described at least one road all is arranged between the negative-phase input and output terminal of described prime amplifier;
The described feedback branch in each road comprises: the switch of serial connection and branch road feedback impedance.
10. a signal is handled and pre-amplification circuit, is used for touch-screen, it is characterized in that, comprising:
Prime amplifier, negative-phase input are suitable for receiving described touch-screen pixel output current signal, and normal phase input end is suitable for receiving reference voltage;
Feedback impedance is suitable for connecting negative-phase input and the output terminal of described prime amplifier;
At least one road feedback branch, wherein each road feedback branch all is arranged between the negative-phase input and output terminal of described prime amplifier, and described each road feedback branch comprises: the switch of serial connection and branch road feedback impedance.
11. signal as claimed in claim 10 is handled and pre-amplification circuit, it is characterized in that described prime amplifier is charge amplifier, described feedback impedance and branch road feedback impedance are realized by electric capacity;
Perhaps, described prime amplifier is voltage amplifier or current-voltage converter, and described feedback impedance and branch road feedback impedance are realized by resistance.
12. signal as claimed in claim 10 is handled and pre-amplification circuit, it is characterized in that, also comprise: compensation current generating unit, be suitable for exporting compensating current signal, eliminating at least part of background signal in the described pixel output current signal, described background signal is the pixel output current signal when not being touched;
The negative-phase input of described prime amplifier also is suitable for receiving described compensating current signal.
13. signal as claimed in claim 12 is handled and pre-amplification circuit, it is characterized in that described compensation current generating unit comprises:
Storage unit is suitable for storing the background signal of all pixel correspondences in the described touch-screen;
Current output unit is suitable for searching from described storage unit according to the coordinate of current pixel point the background signal of this pixel correspondence, and produces compensating current signal according to the background signal that finds;
Electric charge feed-in impedance is suitable for described compensating current signal is exported to the negative-phase input of described prime amplifier.
14. signal as claimed in claim 13 is handled and pre-amplification circuit, it is characterized in that, described current output unit is suitable for searching among the LOOKUP TABLE of coordinate from storage unit according to current pixel point the background signal of this pixel correspondence.
15. signal as claimed in claim 13 is handled and pre-amplification circuit, it is characterized in that described prime amplifier is charge amplifier, described electric charge feed-in impedance and feedback impedance are realized by electric capacity;
Perhaps, described prime amplifier is voltage amplifier or current-voltage converter, and described electric charge feed-in impedance and feedback impedance are realized by resistance.
16. signal as claimed in claim 12 is handled and pre-amplification circuit, it is characterized in that, described prime amplifier is charge amplifier, described compensating current signal is synchronous with background signal and phase place is opposite, the integral charge of described compensating current signal be described background signal integral charge 0.5-1.5 doubly.
17. signal as claimed in claim 11 is handled and pre-amplification circuit, it is characterized in that, described prime amplifier is voltage amplifier or current-to-voltage converter, and described compensating current signal is synchronous with background signal and phase place is opposite, and compensating current signal F2i and background signal F1i satisfy:
, N is integer, 0.1≤M≤0.5.
18. a touch-screen is characterized in that, comprises claim 1 to 17 each described signal processing and pre-amplification circuit.
19. touch-screen as claimed in claim 18, described touch-screen comprise many drive wires and many lines of induction, described signal processing and pre-amplification circuit are electrically connected with the described line of induction.
20. touch-screen as claimed in claim 19, described drive wire and the described line of induction are positioned at different layers, and separate by an insulation course between the two.
21. touch-screen as claimed in claim 19, described drive wire and the described line of induction are positioned at same one deck.
22. touch-screen as claimed in claim 19, a corresponding described signal processing and the pre-amplification circuit of connecting of the line of induction.
23. touch-screen as claimed in claim 19, all lines of induction are connected to a described signal jointly and handle and pre-amplification circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210385195.7A CN103294297B (en) | 2012-10-11 | 2012-10-11 | Signal transacting and pre-amplification circuit and touch-screen |
| PCT/CN2013/073800 WO2014056313A1 (en) | 2012-10-11 | 2013-04-07 | Signal processing and preamplifier circuit and touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210385195.7A CN103294297B (en) | 2012-10-11 | 2012-10-11 | Signal transacting and pre-amplification circuit and touch-screen |
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| Publication Number | Publication Date |
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| CN103294297A true CN103294297A (en) | 2013-09-11 |
| CN103294297B CN103294297B (en) | 2016-04-20 |
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| CN201210385195.7A Active CN103294297B (en) | 2012-10-11 | 2012-10-11 | Signal transacting and pre-amplification circuit and touch-screen |
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| Country | Link |
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| CN (1) | CN103294297B (en) |
| WO (1) | WO2014056313A1 (en) |
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| DE102016124555A1 (en) | 2016-12-15 | 2018-06-21 | Nora Systems Gmbh | Flooring and process for its production |
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| CN105677119A (en) * | 2014-11-18 | 2016-06-15 | 敦泰科技有限公司 | Capacitive touch screen and detection circuit thereof, electronic equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103294297B (en) | 2016-04-20 |
| WO2014056313A1 (en) | 2014-04-17 |
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