CN101833042A - Capacitance measuring circuit and comprehensive control circuit applying same - Google Patents
Capacitance measuring circuit and comprehensive control circuit applying same Download PDFInfo
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- CN101833042A CN101833042A CN200910126085A CN200910126085A CN101833042A CN 101833042 A CN101833042 A CN 101833042A CN 200910126085 A CN200910126085 A CN 200910126085A CN 200910126085 A CN200910126085 A CN 200910126085A CN 101833042 A CN101833042 A CN 101833042A
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Abstract
The invention relates to a capacitance measuring circuit, which is used for measuring a capacitance of a capacitor to be measured that is coupled to an endpoint provided with an operating voltage signal. The capacitance measuring circuit comprises a multi-power source supply circuit, a charge and discharge path and a comparator circuit, wherein the multi-power source supply circuit is used for responding a control signal and selectively providing one of a plurality of power source voltage signals as an output voltage signal to be output; the charge and discharge path is used for providing the output voltage signal with a first voltage level for charging the capacitor to be measured and the output voltage signal with a second voltage level for discharging the capacitor to be measured so as to control the level of the operating voltage signal; and the comparator circuit receives and compares the operating voltage signal and a reference voltage signal to correspondingly generate digital signals to indicate the capacitance of the capacitor to be measured. The invention also provides a comprehensive control circuit applying the capacitance measuring circuit.
Description
Technical field
The present invention relates to a kind of capacitance measurement circuit, and be particularly related to a kind of capacitance measurement circuit that can integrate mutually with display driving circuit.
Background technology
Traditionally, realize user's control interface device with mechanical switch mostly.Because conventional mechanical switch needs directly to contact with the user, just can operate in response to user's steering order, traditional mechanical formula device has the shortcoming that recurring structure damages in user's operating process easily.
In the epoch now that development in science and technology is maked rapid progress, the touch switch exists.Traditionally, the touch switch for example is a capacitance-type switch, and its capacitance by the induction testing capacitance is controlled with user's whether approaching variation.Prior art is to use the capacitance variation that capacitance measurement circuit comes sense capacitance value switch, to reach corresponding control in response to user's operation.Yet how designing lower-cost capacitance measurement circuit becomes one of direction of constantly endeavouring this area.
Summary of the invention
The present invention relates to a kind of capacitance measurement circuit, its voltage signal according to the not coordination standard that multi-power supply circuit provides comes the testing capacitance of different numerical ranges is carried out the measured capacitance value operation.This multi-power supply circuit can be gamma voltage (Gamma voltage) supply circuit in the display driver, and the capacitance measurement circuit that the present invention is correlated with also can be incorporated in the display driver effectively.Therefore, compare with traditional capacitance measurement circuit, the capacitance measurement circuit that the present invention is correlated with has the advantage that cost is lower and can carry out the measured capacitance value operation by the input voltage that receives coordination standard not to the testing capacitance of different numerical value.
Propose a kind of capacitance measurement circuit according to the present invention, be used for the capacitance of testing capacitance is measured, testing capacitance is coupled to an end points, has the operating voltage signal on this end points.Capacitance measurement circuit comprises multi-power supply circuit, charging and discharging path and comparator circuit.Multi-power supply circuit is used in response to control signal, optionally provide a plurality of power supply voltage signals one of them export as output voltage signal.The charging and discharging path is used to provide the output voltage signal with first voltage level testing capacitance is carried out charging operations, and provides the output voltage signal with second voltage level that testing capacitance is carried out discharge operation, and is accurate with the position of control operation voltage signal.Comparator circuit receives and compare operation voltage signal and reference voltage signal, indicates the capacitance of this testing capacitance to produce digital signal accordingly.
According to capacitance measurement circuit of the present invention, wherein, further comprise treatment circuit, be used for coming computing to obtain the capacitance of testing capacitance in response to digital signal.
According to capacitance measurement circuit of the present invention, wherein, multi-power supply circuit is the gamma voltage supply circuit, is used to provide a plurality of power supply voltage signal outputs of a plurality of gamma voltages as correspondence.
According to capacitance measurement circuit of the present invention, wherein, another end points of testing capacitance receives the ground voltage signal.
According to capacitance measurement circuit of the present invention, wherein, the charging and discharging path comprises load circuit, and this load circuit and testing capacitance are connected in series.
Propose a kind of integrated control circuit according to the present invention, be applied in the touch control display panel.Integrated control circuit comprises multi-power supply circuit, capacitance measurement circuit and display driver circuit.Multi-power supply circuit is used in response to control signal, optionally provide a plurality of gamma voltage signals one of them export as output voltage signal.Capacitance measurement circuit is used for the capacitance of testing capacitance is measured, and testing capacitance is coupled to an end points, has the operating voltage signal on this end points.Capacitance measurement circuit comprises charging and discharging path and comparator circuit.The charging and discharging path is used to provide the output voltage signal with first voltage level testing capacitance is carried out charging operations, and provides the output voltage signal with second voltage level that testing capacitance is carried out discharge operation, and is accurate with the position of control operation voltage signal.Comparator circuit receives and compare operation voltage signal and reference voltage signal, indicates the capacitance of this testing capacitance to produce digital signal accordingly.Display driver circuit is used to provide gamma voltage and drives touch control display panel demonstration display frame.
According to integrated control circuit of the present invention, in one embodiment, further comprise treatment circuit, be used for coming computing to obtain the capacitance of testing capacitance in response to digital signal.
According to integrated control circuit of the present invention, in one embodiment, multi-power supply circuit is the gamma voltage supply circuit, and multi-power supply circuit is incorporated in the display driver circuit.
According to integrated control circuit of the present invention, in one embodiment, another end points of testing capacitance receives the ground voltage signal.
According to integrated control circuit of the present invention, in one embodiment, the charging and discharging path comprises load circuit, and this load circuit and this testing capacitance are connected in series.
According to integrated control circuit of the present invention, in one embodiment, display driver circuit is source electrode drive circuit (Source Driver).
According to integrated control circuit of the present invention, in one embodiment, capacitance measurement circuit and display driver circuit are realized by same integrated circuit (IC).
For foregoing of the present invention can be become apparent, preferred embodiment cited below particularly, and in conjunction with the accompanying drawings, be described in detail below:
Description of drawings
Fig. 1 shows the synoptic diagram according to the capacitance measurement circuit of the embodiment of the invention.
Fig. 2 shows the coherent signal sequential chart of the capacitance measurement circuit 1 of Fig. 1.
Fig. 3 shows the calcspar according to the integrated control circuit of the embodiment of the invention.
Fig. 4 shows another calcspar according to the integrated control circuit of the embodiment of the invention.
Embodiment
The power supply signal that the capacitance measurement circuit of the embodiment of the invention provides in response to multi-power supply circuit comes testing capacitance is carried out the measured capacitance value operation.
Please refer to Fig. 1 and Fig. 2, Fig. 1 illustrates the synoptic diagram according to the capacitance measurement circuit of the embodiment of the invention, and Fig. 2 illustrates the coherent signal sequential chart of the capacitance measurement circuit 1 of Fig. 1.Capacitance measurement circuit 1 is used for the capacitance of capacitor C c to be measured is measured.The termination of testing capacitance Cc is received ground voltage, and the other end is coupled to end points Ed.Has operating voltage signal SOP on the end points Ed.Capacitance measurement circuit 1 comprises multi-power supply circuit 12, charging and discharging path 14, comparator circuit 16 and treatment circuit 18.
Multi-power supply circuit 12 produces a plurality of fixed-voltage power supply signals, and be used for optionally providing a high-voltage power supply signal and a LVPS signal in these fixed-voltage power supply signals to export as output voltage signal SVO, make output voltage signal SVO have high signal level and low signal position standard.
Under the initial operation state, treatment circuit 18 provides has original state control signal SC to multi-power supply circuit 12, the voltage source signal of selecting to have voltage level HV1 with control multi-power supply circuit 12 be its high-voltage power supply signal, and the voltage source signal that selection has a voltage level LV is its LVPS signal.In other words, under the initial operation state, the high voltage of output voltage signal SVO and low-voltage position standard equal voltage level HV1 and LV respectively.
In an operational instances, multi-power supply circuit 12 further provides the have high voltage level output voltage signal SVO of (voltage level HV1) in response to first state of control signal SC; And provide output voltage signal SVO with low-voltage position standard (voltage level LV) in response to second state of control signal SC.
Charging and discharging path 14 for example comprises that load circuit R is coupled between multi-power supply circuit 12 and the end points Ed.Charging and discharging path 14 be used to provide have voltage level HV1 output voltage signal SVO to end points Ed, so that capacitor C c to be measured is carried out charging operations, make the position of operating voltage signal SOP accurate near voltage level HV1.
Charging and discharging path 14 further provides the output voltage signal SVO with voltage level LV to end points Ed, so that capacitor C c to be measured is carried out discharge operation, makes the position of operating voltage signal SOP accurate near voltage level LV.
Comparator circuit 16 receives and compare operation voltage signal SOP and reference voltage signal SRF, to produce the capacitance of digital signal SDG indication testing capacitance Cc accordingly.For instance, reference voltage signal SRF for example has voltage level RV, and it is between voltage level HV1 and LV.When the position standard of operating voltage signal SOP was lower than voltage level RV, comparator circuit 16 provided the digital signal SDG of low-voltage position standard; When the position standard of operating voltage signal SOP was higher than voltage level RV, comparator circuit 16 provided the digital signal SDG of high voltage level.
Treatment circuit 18 for example further according to operating unit in the time the accurate number of times that switches between high voltage and low-voltage position standard in the position of digital signal SDG calculate the capacitance of testing capacitance Cc accordingly.
In an example, treatment circuit 18 produces in response to the digital signal SDG with low level and provides the control signal SC with first state to multi-power supply circuit 12, provides the SVO of the output voltage signal with high voltage level with control multi-power supply circuit 12.Treatment circuit 18 further produces in response to the digital signal SDG with high levels and provides the control signal SC with second state to multi-power supply circuit 12, provides the output voltage signal SVO with low-voltage position standard with control multi-power supply circuit 12.
In the present embodiment, though only providing the situation of the output voltage signal SVO of have high voltage level respectively (for example equaling voltage level HV1) and low-voltage position standard (for example equaling voltage level LV) with multi-power supply circuit 12 in response to first and second state of control signal SC indication is that example explains, yet the multi-power supply circuit 12 of present embodiment is not limited thereto.In another example, the multi-power supply circuit 12 of present embodiment also can be carried out corresponding operation in response to other states of control signal SC indication.
For instance, when the capacitance of testing capacitance Cc too high, and the output voltage signal SVO that multi-power supply circuit 12 provides can't be promoted to voltage above voltage level RV with the voltage on the end points Ed from low level in the time in this operating unit, or the voltage on the end points Ed is pulled low to the voltage that is lower than voltage level RV from high levels.In other words, this moment, output voltage signal SVO can't provide sufficient driving force to come to drive in the time and change in this operating unit the voltage of testing capacitance Cc two ends storage.Like this, the accurate number of times that switches on high voltage and low-voltage position standard in the position of digital signal SDG is zero, and treatment circuit 18 can't obtain the capacitance of testing capacitance Cc according to the digital signal SDG of this moment.
In this case, treatment circuit 18 is in response to continuing to have high voltage level or having the digital signal SDG generation of low-voltage position standard and provide the control signal SC of indication measurement error condition to provide to multi-power supply circuit 12.Measure the control signal of error condition in response to this of control signal SC indication, multi-power supply circuit 12 selects other high-voltage power supply voltage signals in these fixed-voltage power supply signals to export as output voltage signal SVO.For instance, the power supply voltage signal that has voltage level HV2 in multi-power supply circuit 12 these power supply voltage signals of selection is exported as output voltage signal SVO.Wherein voltage level HV2 drives electric Cc to be measured greater than voltage level HV1 with the output voltage signal SVO that tool preferred drive ability is provided.
Then, multi-power supply circuit 12 provides the voltage source signal with voltage level HV2 as output voltage signal SVO output in response to first state of control signal SC, and provides the voltage source signal with voltage level LV to export as output voltage signal in response to second state of control signal SC.
When if multi-power supply circuit 12 still continues to receive the control signal SC of indication measurement error condition afterwards, then multi-power supply circuit 12 repeats aforementioned operation, exports as output voltage signal SVO with the voltage source signal of selecting to have voltage level HV3.Voltage level HV3 is higher than voltage level HV2.
In the present embodiment, though only adjusting its high signal level with multi-power supply circuit 12 in response to control signal SC is that the example that is operating as of voltage level HV1-HV3 explains, yet, the multi-power supply circuit 12 of present embodiment is not limited to adjust the high signal level of control signal SC, but also can adjust the low signal position standard of control signal SC.Therefore, also can promote the driving force of output voltage signal SVO.
Please refer to Fig. 3, it illustrates the calcspar according to the integrated control circuit of the embodiment of the invention.In an example, the multi-power supply circuit 12 in the former capacitance measurement circuit 1 can be realized by the digital analog converter DA in the display driver circuit 2, and capacitance measurement circuit 1 ' integrate mutually with display driver circuit 2, to form integrated control circuit 10.
For instance, digital analog converter DA for example comprises the gamma voltage supply circuit, it is used for changing in the display driver circuit 2 digital signal that produces via offset buffer (Shift Register) SR and data latching device (Latch) DL obtaining simulating signal, and it is exported via output buffer OB.
Capacitance measurement circuit 1 ' comprise metering circuit 1a and treatment circuit 1b.Metering circuit 1a for example comprises charging and discharging path and the comparator circuit shown in Fig. 1.The charging and discharging path couples a touch switch in comparator circuit and the touch panel 100.The charging and discharging path further receives and comes this touch switch is carried out the charge and discharge operation according to the output voltage signal SVO ' that digital analog converter DA provides, to produce corresponding digital signal SDG '.
Treatment circuit 1b carries out the operation of treatment circuit 18 in Fig. 1, to produce control signal SC ' digital analog converter DA is controlled.By the shared digital analog converter DA that comprises the gamma voltage supply circuit, but the integrated control circuit 10 integration capacitance value metering circuits 1 of present embodiment ' with display driver circuit 2.In an example, integrated control circuit 10 is for example realized by an integrated circuit.
Please refer to Fig. 4, it illustrates another calcspar according to the integrated control circuit of the embodiment of the invention.In another example, be integrated in integrated control circuit 10 ' in capacitance measurement circuit 1 " for example be subjected to being arranged at its outside multi-power supply circuit 12 ' driving, come the corresponding measured capacitance value operation of touch-sensitive display 200 ' carry out.Display driver 2 ' be controlled by time schedule controller TC ' to drive touch control display panel 100 ' show image picture.
The capacitance measurement circuit of the embodiment of the invention comes the testing capacitance of different numerical ranges is carried out the measured capacitance value operation according to the voltage signal of the not coordination standard that multi-power supply circuit provides.And the capacitance measurement circuit of the embodiment of the invention comprises that also multi-power supply circuit is used for adjusting in response to the control signal of measurement error condition of indication the high signal or the low signal position standard of output voltage signal, with the capacitance measurable range of the capacitance measurement circuit of adjusting the embodiment of the invention.Therefore, compare with traditional capacitance value metering circuit, the capacitance measurement circuit of the embodiment of the invention has that the measured capacitance value scope can be adjusted, the measured capacitance value scope more extensively and can reach the advantage of automatic adjustment capacitance measurable range in response to the control signal of feedbacking.
In addition, the digital analog converter that the capacitance measurement circuit of the embodiment of the invention also can be used in the display driver circuit is used as multi-power supply circuit, and the capacitance measurement circuit of the embodiment of the invention also can be incorporated in the display driver circuit effectively.Therefore, compare with traditional capacitance measurement circuit, the capacitance measurement circuit that the present invention is correlated with has the advantage that cost is lower and can integrate mutually with display driver circuit.
In sum, though the present invention with the preferred embodiment disclosure as above, yet it is not to be used for limiting the present invention.The persons of ordinary skill in the technical field of the present invention without departing from the spirit and scope of the present invention, should do various changes and modification.Therefore, protection scope of the present invention should be as the criterion with claims institute restricted portion.
The primary clustering symbol description
1,1 ', 1 ": capacitance measurement circuit 12,12 ': multi-power supply circuit
14: charging and discharging path 16: comparator circuit
18,1b: treatment circuit Cc: testing capacitance
200,200 ': touch-sensitive display TC, TC ': time schedule controller
100,100 ': touch control display panel 10,10 ': integrated control circuit
2,2 ': display driver circuit OB: output buffer
DA: digital analog converter DL: data latching device
SR: offset buffer 1a: metering circuit.
Claims (12)
1. a capacitance measurement circuit is used for the capacitance of testing capacitance is measured, and described testing capacitance is coupled to an end points, has the operating voltage signal on the described end points, and described capacitance measurement circuit comprises:
Multi-power supply circuit is used in response to control signal, optionally provide a plurality of power supply voltage signals one of them export as output voltage signal;
The charging and discharging path, be used to provide described output voltage signal described testing capacitance is carried out charging operations with first voltage level, and provide described output voltage signal that described testing capacitance is carried out discharge operation with second voltage level, accurate with the position of controlling described operating voltage signal; And
Comparator circuit receives and more described operating voltage signal and reference voltage signal, indicates the capacitance of described testing capacitance to produce digital signal accordingly.
2. capacitance measurement circuit according to claim 1 further comprises:
Treatment circuit is used for coming computing to obtain the capacitance of described testing capacitance in response to described digital signal.
3. capacitance measurement circuit according to claim 1, wherein said multi-power supply circuit is the gamma voltage supply circuit, is used to provide the described a plurality of power supply voltage signal outputs of a plurality of gamma voltages as correspondence.
4. capacitance measurement circuit according to claim 1, another end points of wherein said testing capacitance receives the ground voltage signal.
5. capacitance measurement circuit according to claim 1, wherein said charging and discharging path comprises load circuit, described load circuit and described testing capacitance are connected in series.
6. an integrated control circuit is applied in the touch control display panel, and described integrated control circuit comprises:
Multi-power supply circuit is used in response to control signal, optionally provide a plurality of gamma voltage signals one of them export as output voltage signal;
Capacitance measurement circuit is used for the capacitance of testing capacitance is measured, and described testing capacitance is coupled to an end points, has the operating voltage signal on the described end points, and described capacitance measurement circuit comprises:
The charging and discharging path, be used to provide described output voltage signal described testing capacitance is carried out charging operations with first voltage level, and provide described output voltage signal that described testing capacitance is carried out discharge operation with second voltage level, accurate with the position of controlling described operating voltage signal; And comparator circuit, receive and more described operating voltage signal and reference voltage signal, indicate the capacitance of described testing capacitance to produce digital signal accordingly; And
Display driver circuit is used to provide described a plurality of gamma voltage and drives described touch control display panel demonstration display frame.
7. integrated control circuit according to claim 6 further comprises:
Treatment circuit is used for coming computing to obtain the capacitance of described testing capacitance in response to described digital signal.
8. integrated control circuit according to claim 6, wherein:
Described multi-power supply circuit is the gamma voltage supply circuit, and described multi-power supply circuit is incorporated in the described display driver circuit.
9. integrated control circuit according to claim 6, another end points of wherein said testing capacitance receives the ground voltage signal.
10. integrated control circuit according to claim 6, wherein said charging and discharging path comprises load circuit, described load circuit and described testing capacitance are connected in series.
11. integrated control circuit according to claim 6, wherein said display driver circuit are source electrode drive circuit.
12. integrated control circuit according to claim 6, wherein said capacitance measurement circuit and described display driver circuit are realized by same integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101260857A CN101833042B (en) | 2009-03-09 | 2009-03-09 | Capacitance measuring circuit and comprehensive control circuit applying same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101260857A CN101833042B (en) | 2009-03-09 | 2009-03-09 | Capacitance measuring circuit and comprehensive control circuit applying same |
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| Publication Number | Publication Date |
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| CN101833042A true CN101833042A (en) | 2010-09-15 |
| CN101833042B CN101833042B (en) | 2012-07-18 |
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| CN2009101260857A Expired - Fee Related CN101833042B (en) | 2009-03-09 | 2009-03-09 | Capacitance measuring circuit and comprehensive control circuit applying same |
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| JP3264884B2 (en) * | 1998-05-11 | 2002-03-11 | 三菱電機株式会社 | Capacitance detection circuit |
| US7477098B2 (en) * | 2007-02-08 | 2009-01-13 | Mediatek Singapore Pte Ltd | Method and apparatus for tuning an active filter |
| CN101315398B (en) * | 2007-05-28 | 2011-03-23 | 承永资讯科技股份有限公司 | Capacitance value measuring apparatus and method |
| CN101349716B (en) * | 2008-07-22 | 2012-06-20 | 上海海事大学 | Micro-capacitance reference measuring circuit |
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