CN102968229A - Charging current compensation method and system of capacitance-type touch screen - Google Patents
Charging current compensation method and system of capacitance-type touch screen Download PDFInfo
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- CN102968229A CN102968229A CN2012104404359A CN201210440435A CN102968229A CN 102968229 A CN102968229 A CN 102968229A CN 2012104404359 A CN2012104404359 A CN 2012104404359A CN 201210440435 A CN201210440435 A CN 201210440435A CN 102968229 A CN102968229 A CN 102968229A
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- touch screen
- capacitive touch
- sweep trace
- charging current
- capacitance
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Abstract
The invention discloses a charging current compensation method and a system of a capacitance-type touch screen. The method comprises the following steps of sequentially driving each scanning line of a capacitance-type touch screen through preset drive current I1 within a preset time T, and measuring signal voltage output of each scanning line; comparing the signal voltage output with a preset voltage value of the scanning line to obtain a voltage deviation value; calculating a current variation difference value according to a capacitance operation preset value and the voltage deviation value, and finally solving the real drive current of each scanning line of the capacitance-type touch screen. Due to the adoption of the method and the system, the touch sensing sensitivity can be enhanced, the processing process is rapid and convenient, and the working performance is stable and reliable. Meanwhile, the debugging workload of a touch module caused by the manufacture process difference of the capacitance-type touch screen can be reduced, the working hours of the production and debugging link and the cost of raw materials can be saved, and a good market popularization prospect can be realized.
Description
Technical field
The present invention relates to the capacitive touch screen technical field, relate in particular to a kind of charging current compensation method and system of capacitive touch screen inductor of dynamic adjustment.
Background technology
Capacitive touch screen is particulate metal conductive materials that sticks layer of transparent at glass surface.When finger touch was on metal level, the electric capacity of contact will change, so that the oscillator frequency that is attached thereto changes, changed by survey frequency and can determine the touch location acquired information.
Because the restriction of processing technology, each bar inductor (also claiming the line of induction) on the same capacitive touch screen, and the size of every inductor of the capacitive touch screen of different production batch or live width all can have a certain amount of difference, such situation is in esse intrinsic problem during capacitive touch screen is produced.In addition, the variation of environmental baseline (such as temperature etc.) all can make sensor sensing circuit institute induced signal vary in size, and then affects touch-screen usefulness.
In view of this, prior art haves much room for improvement and improves.
Summary of the invention
In view of the deficiencies in the prior art, the object of the invention is to provide a kind of charging current compensation method and system of capacitive touch screen inductor.Be intended to solve the affected problem of touch-screen usefulness that the processing procedure difference of capacitive touch screen in the prior art is brought.
Technical scheme of the present invention is as follows:
A kind of charging current compensation method of capacitive touch screen inductor wherein, may further comprise the steps:
S1, in a preset time T, with predefined drive current I
1Drive successively the sweep trace of each bar capacitive touch screen, measure the signal voltage output V of each sweep trace
(i, t1), wherein, i represents different sweep traces, t1 represents sweep time;
S2, signal voltage is exported V
(i, t1)With the scheduled voltage V of sweep trace
R (i)Compare, obtain voltage deviation value △ V
(i), wherein, △ V
(i)=V
R (i)-V
(i, t1)
S3, electric capacity is operated preset value C
Bias (i)And above-mentioned voltage deviation value △ V
(i)Bring formula into: △ V
(i)=△ I
(i)* T/ C
Bias (i),
Obtain described curent change difference △ I
(i)
S4, then set the actual drive current I=I of the sweep trace of each bar capacitive touch screen
1+ △ I
(i)
Preferably, the charging current compensation method of described capacitive touch screen inductor, wherein, described capacitive touch screen is self-tolerant projecting type capacitor formula touch-screen.
Preferably, the charging current compensation method of described capacitive touch screen inductor, wherein, described capacitive touch screen is mutual appearance formula projecting type capacitor formula touch-screen.
A kind of charging current bucking-out system of capacitive touch screen inductor wherein, comprising:
Default scan module is used in a preset time T, with predefined drive current I
1Drive successively the sweep trace of each bar capacitive touch screen, measure the signal voltage output V of each sweep trace
(i, t1), wherein, i represents different sweep traces, t1 represents sweep time;
Voltage comparison module is used for signal voltage is exported V
(i, t1)With the scheduled voltage V of sweep trace
R (i)Compare, obtain voltage deviation value △ V
(i), wherein, △ V
(i)=V
R (i)-V
(i, t1)
The curent change difference block is used for according to electric capacity being operated preset value C
Bias (i)And above-mentioned voltage deviation value △ V
(i)Bring formula into: △ V
(i)=△ I
(i)* T/ C
Bias (i),
Obtain described curent change difference △ I
(i)
Actual drive current setting module is for the actual drive current I=I of the sweep trace of setting each bar capacitive touch screen
1+ △ I
(i)
Preferably, the charging current bucking-out system of described capacitive touch screen inductor, wherein, described capacitive touch screen is mutual appearance formula projecting type capacitor formula touch-screen or self-tolerant projecting type capacitor formula touch-screen.
Beneficial effect:
Charging current compensation method and the system of the application's capacitive touch screen inductor can strengthen the sensitivity of touch-control sensing, make processing procedure efficient and convenient, stable and reliable working performance.Simultaneously, also reduce the debugging work load of the touch module that the processing procedure difference owing to capacitive touch screen causes, saved man-hour and the raw material cost of producing the debugging link, had good marketing prospect.
Description of drawings
Fig. 1 is the process flow diagram of charging current compensation method of the application's capacitive touch screen inductor.
Fig. 2 is the structured flowchart of charging current bucking-out system of the application's capacitive touch screen inductor.
Embodiment
The invention provides a kind of charging current compensation method and system of capacitive touch screen inductor, clearer, clear and definite for making purpose of the present invention, technical scheme and effect, below the present invention is described in more detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
See also Fig. 1, it is the process flow diagram of charging current compensation method of the application's capacitive touch screen inductor.As shown in the figure, the charging current compensation method of described capacitive touch screen inductor may further comprise the steps:
S1, in a preset time T, with predefined drive current I
1Drive successively the sweep trace of each bar capacitive touch screen, measure the signal voltage output V of each sweep trace
(i, t1), wherein, i represents different sweep traces, t1 represents sweep time;
S2, signal voltage is exported V
(i, t1)With the scheduled voltage V of sweep trace
R (i)Compare, obtain voltage deviation value △ V
(i), wherein, △ V
(i)=V
R (i)-V
(i, t1)
S3, electric capacity is operated preset value C
Bias (i)And above-mentioned voltage deviation value △ V
(i)Bring formula into: △ V
(i)=△ I
(i)* T/ C
Bias (i),
Obtain described curent change difference △ I
(i)
S4, then set the actual drive current I=I of the sweep trace of each bar capacitive touch screen
1+ △ I
(i)
The below specifically describes for above-mentioned steps respectively.
Described step S1 is in a preset time T, with predefined drive current I
1Drive successively the sweep trace (also claiming inductor or the line of induction) of each bar capacitive touch screen, measure the signal voltage output V of each sweep trace
(i, t1), wherein, i represents different sweep traces, t1 represents sweep time.Be, when driving, capacitive touch screen does not touch command signal (as pointing not touch mode capacitive touch-screen) with should be noted that, and described capacitive touch screen has n bar sweep trace, then i=1,2,3 ... n.I, n are natural number.
Then, in step S2, signal voltage is exported V
(i, t1)With the scheduled voltage V of sweep trace
R (i)Compare, obtain voltage deviation value △ V
(i), wherein, △ V
(i)=V
R (i)-V
(i, t1)Described scheduled voltage V
R (i)Be that the capacitance variations of a pre-defined target induction on every sweep trace i is in certain charging current and the relative voltage value in duration of charging.If the capacitor C on each sweep trace
S (i)All in the distribution range of an expection, then induction system should obtain an induced voltage V who is positioned at the dreamboat scope
R (i)
Then, in step S3, electric capacity is operated preset value C
Bias (i)And above-mentioned voltage deviation value △ V
(i)Bring formula into: △ V
(i)=△ I
(i)* T/ C
Bias (i), the electric capacity operation preset value that described Cbias (i) makes touch screen system scan line according to specification for system designer.
At last, set the actual drive current I=I of the sweep trace of each bar capacitive touch screen
1+ △ I
(i)Because draw V if want on each sweep trace i
R (i), then must within the same duration of charging, adjust charging current, make I=I
1+ △ I
(i)Thereby realize the automatic control to the value of the charging current of capacitive touch screen inductor: according to property difference (impedance variation and the length of each bar sweep trace self, thickness changes) capacitance variations that forms, make automatic adjustment, reach the signal value that touch-screen control integration circuit collects every touch screen induction device and be distributed within the default working range.
It should be noted that this default capacitance variations working range selected be principle specification according to the touch sensing sensor circuit exportable optimum signal magnitude range on the sensor during to the finger contact capacitive touch screen.In the working range that the size of the signal that each other inductor reacts charging current without finger contact the time is all being preset, sensor circuit can strengthen the sensitivity of touch-control sensing to the optimization that is set as of sensor at this moment.
Generally speaking, by signal voltage output V
(i, t1)With scheduled voltage V
R (i)Difference adjust charging current, capacitive touch screen can obtain a stray capacitance to every inductor (line) to be estimated dynamically, thereby making technology and the formed capacitance difference of environment are obtained suitable compensation.
Simultaneously, the present invention also provides a kind of charging current bucking-out system of capacitive touch screen inductor, and as shown in Figure 2, it comprises: default scan module, voltage comparison module, curent change difference block and actual drive current setting module.Wherein, described default scan module is used in a preset time T, with predefined drive current I
1Drive successively the sweep trace of each bar capacitive touch screen, measure the signal voltage output V of each sweep trace
(i, t1), wherein, i represents different sweep traces, t1 represents sweep time; Voltage comparison module is used for signal voltage is exported V
(i, t1)With the scheduled voltage V of sweep trace
R (i)Compare, obtain voltage deviation value △ V
(i), wherein, △ V
(i)=V
R (i)-V
(i, t1)The curent change difference block is used for electric capacity is operated preset value C
Bias (i)And above-mentioned voltage deviation value △ V
(i)Bring formula into: △ V
(i)=△ I
(i)* T/ C
Bias (i), obtain described curent change difference △ I
(i)Described actual drive current setting module is used for the actual drive current I=I of the sweep trace of each bar capacitive touch screen of setting
1+ △ I
(i)
Further, above-mentioned capacitive touch screen can be mutual appearance formula projecting type capacitor formula touch-screen or self-tolerant projecting type capacitor formula touch-screen.
In sum, charging current compensation method and the system of the application's capacitive touch screen inductor, its at first, in a preset time T, with predefined drive current I
1Drive successively the sweep trace of each bar capacitive touch screen, measure the signal voltage output V of each sweep trace
(i, t1)Then, signal voltage is exported V
(i, t1)With the scheduled voltage V of sweep trace
R (i)Compare, obtain voltage deviation value △ V
(i)Again according to electric capacity being operated preset value C
Bias (i)And above-mentioned voltage deviation value △ V
(i)Bring formula △ V into
(i)=△ I
(i)* T/ C
Bias (i), obtain described curent change difference △ I
(i), set at last the actual drive current I=I of the sweep trace of each bar capacitive touch screen
1+ △ I
(i)The sensitivity that it can strengthen touch-control sensing makes processing procedure efficient and convenient, stable and reliable working performance.Simultaneously, also reduce the debugging work load of the touch module that the processing procedure difference owing to capacitive touch screen causes, saved man-hour and the raw material cost of producing the debugging link, had good marketing prospect.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (5)
1. the charging current compensation method of a capacitive touch screen inductor is characterized in that, may further comprise the steps:
S1, in a preset time T, with predefined drive current I
1Drive successively the sweep trace of each bar capacitive touch screen, measure the signal voltage output V of each sweep trace
(i, t1), wherein, i represents different sweep traces, t1 represents sweep time;
S2, signal voltage is exported V
(i, t1)With the scheduled voltage V of sweep trace
R (i)Compare, obtain voltage deviation value △ V
(i), wherein, △ V
(i)=V
R (i)-V
(i, t1)
S3, electric capacity is operated preset value C
Bias (i)And above-mentioned voltage deviation value △ V
(i)Bring formula into: △ V
(i)=△ I
(i)* T/ C
Bias (i),
Obtain described curent change difference △ I
(i)
S4, then set the actual drive current I=I of the sweep trace of each bar capacitive touch screen
1+ △ I
(i)
2. the charging current compensation method of capacitive touch screen inductor according to claim 1 is characterized in that, described capacitive touch screen is self-tolerant projecting type capacitor formula touch-screen.
3. the charging current compensation method of capacitive touch screen inductor according to claim 1 is characterized in that, described capacitive touch screen is mutual appearance formula projecting type capacitor formula touch-screen.
4. the charging current bucking-out system of a capacitive touch screen inductor is characterized in that, comprising:
Default scan module is used in a preset time T, with predefined drive current I
1Drive successively the sweep trace of each bar capacitive touch screen, measure the signal voltage output V of each sweep trace
(i, t1), wherein, i represents different sweep traces, t1 represents sweep time;
Voltage comparison module is used for signal voltage is exported V
(i, t1)With the scheduled voltage V of sweep trace
R (i)Compare, obtain voltage deviation value △ V
(i), wherein, △ V
(i)=V
R (i)-V
(i, t1)
The curent change difference block is used for according to electric capacity being operated preset value C
Bias (i)And above-mentioned voltage deviation value △ V
(i)Bring formula into: △ V
(i)=△ I
(i)* T/ C
Bias (i),
Obtain described curent change difference △ I
(i)
Actual drive current setting module is for the actual drive current I=I of the sweep trace of setting each bar capacitive touch screen
1+
△I
(i)。
5. the charging current bucking-out system of capacitive touch screen inductor according to claim 4 is characterized in that, described capacitive touch screen is mutual appearance formula projecting type capacitor formula touch-screen or self-tolerant projecting type capacitor formula touch-screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104404359A CN102968229A (en) | 2012-11-07 | 2012-11-07 | Charging current compensation method and system of capacitance-type touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104404359A CN102968229A (en) | 2012-11-07 | 2012-11-07 | Charging current compensation method and system of capacitance-type touch screen |
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| Publication Number | Publication Date |
|---|---|
| CN102968229A true CN102968229A (en) | 2013-03-13 |
Family
ID=47798399
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104404359A Pending CN102968229A (en) | 2012-11-07 | 2012-11-07 | Charging current compensation method and system of capacitance-type touch screen |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345928A (en) * | 2013-07-24 | 2015-02-11 | 宸鸿科技(厦门)有限公司 | Touch panel detection device and detection method thereof |
| CN108470546A (en) * | 2018-04-08 | 2018-08-31 | 京东方科技集团股份有限公司 | Current compensation circuit, VR equipment and control method |
| CN109144224A (en) * | 2018-09-26 | 2019-01-04 | Oppo广东移动通信有限公司 | The power consumption optimization method and device of touch screen |
| CN111381733A (en) * | 2018-12-27 | 2020-07-07 | 硅工厂股份有限公司 | Current-driven touch sensing device |
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| CN1949160A (en) * | 2005-10-10 | 2007-04-18 | 义隆电子股份有限公司 | Induced quanity compensating method of touch controlling board inductor |
| CN102484471A (en) * | 2009-10-30 | 2012-05-30 | 株式会社半导体能源研究所 | Driver circuit, display device including the driver circuit, and electronic device including the display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345928A (en) * | 2013-07-24 | 2015-02-11 | 宸鸿科技(厦门)有限公司 | Touch panel detection device and detection method thereof |
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| CN108470546A (en) * | 2018-04-08 | 2018-08-31 | 京东方科技集团股份有限公司 | Current compensation circuit, VR equipment and control method |
| CN108470546B (en) * | 2018-04-08 | 2020-07-07 | 京东方科技集团股份有限公司 | Current compensation circuit, VR equipment and control method |
| CN109144224A (en) * | 2018-09-26 | 2019-01-04 | Oppo广东移动通信有限公司 | The power consumption optimization method and device of touch screen |
| CN109144224B (en) * | 2018-09-26 | 2020-08-07 | Oppo广东移动通信有限公司 | Power consumption optimization method and device for touch screen |
| CN111381733A (en) * | 2018-12-27 | 2020-07-07 | 硅工厂股份有限公司 | Current-driven touch sensing device |
| CN111381733B (en) * | 2018-12-27 | 2024-02-27 | 硅工厂股份有限公司 | Current driven touch sensing device |
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Application publication date: 20130313 |
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