CN104461151B - The detection method of touch screen of low pressure high s/n ratio - Google Patents
The detection method of touch screen of low pressure high s/n ratio Download PDFInfo
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- CN104461151B CN104461151B CN201410811742.2A CN201410811742A CN104461151B CN 104461151 B CN104461151 B CN 104461151B CN 201410811742 A CN201410811742 A CN 201410811742A CN 104461151 B CN104461151 B CN 104461151B
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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
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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Abstract
The present invention provides a kind of detection method of touch screen of low pressure high s/n ratio, and it is by the way of low pressure parallel drive；The drive signal transmitting terminal of the detection circuit of touch-screen is sent simultaneously the first signal and secondary signal, and both phases are completely opposite；By detecting SECO to the inside for detecting circuit, using secondary signal as effective detection burst signal；The drive signal that drive signal transmitting terminal is sent is made up of a series of detection burst signals, and each detection burst signal is made up of the first signal or secondary signal；Wherein, the method comprising the steps of：Within the period for sending the 1st, the the 2nd ... n-th detection burst signal, respectively by n-th, the n-th 1 ... the 1st drive signal transmitting terminal detection circuit for access, n are the sum of drive signal transmitting terminal；The multiple detection signal receiving terminals for detecting circuit are sampled respectively successively respectively.The present invention can realize the touch detection of low pressure, high s/n ratio, be not only convenient for circuit realiration, and effectively.
Description
Technical field
The present invention relates to touch control detection technical field, in particular it relates to a kind of touch of low pressure high s/n ratio
Shield detection method.
Background technology
With electronics, the fast development of the communication technology, various mobile terminal (such as mobile phone, the flat board electricity with touch function
Brain, e-book etc.) progressively to popularize, increasing detection technique is applied to touch-control field.Existing touch screen (touches
Screen) detection technique is more using square-wave signal as drive signal, but square-wave signal has multiple frequency spectrums, is easily disturbed, and it is anti-interference
Ability.In order to strengthen the antijamming capability of drive signal, later touch screen detection technique is also used as driving using sine wave signal
Signal, sine wave signal frequency spectrum is single, strong antijamming capability, but either square-wave signal or sine wave signal, and they are equal
It is not high using low-voltage driving, signal to noise ratio.
In order to improve signal to noise ratio, a part of touch screen detection technique attempts to use high-voltage driven signal, but high drive
Shortcoming is that can not produce high pressure inside driving chip, it is necessary to external boost capacitor.So on the one hand add periphery circuit design
Complexity, add cost, the output signal of another aspect high drive can also impact to other chips, turn into new
Interference source.Requirement of the high drive simultaneously to chip technology and processing procedure can also greatly improve, and be unfavorable for volume production.Therefore, by low
Drive signal is pressed to realize that the effect of high-voltage driven signal (raising signal to noise ratio) has great importance for touch screen detection technique.
Fig. 1 is a kind of schematic diagram of the used detection circuit of detection method of touch screen of the prior art.Detection electricity
Road is a kind of currently used detection circuit, and it uses integral sine capacitive feedback principle.As shown in figure 1, first switch S1 is led
Logical, input signal VSIN is by touching after the negative input end VCOM of initialization output level to amplifier AMP, second switch S2 conducting
Amplifier AMP is input to after touching screen, now input signal VSIN is in the voltage (VPP+) of the initial phase of sine wave, under starting
Drop.In order to ensure that amplifier AMP positive input terminal voltage (V+) is equal to negative input end voltage (V-), output signal VOUT level liters
It is high.At the end of sine declines, second switch S2, discharge off loop are disconnected, output signal VOUT level is kept.
Fig. 2 is that the first switch and second in the used detection circuit of a kind of detection method of touch screen shown in Fig. 1 is opened
The signal timing diagram of pass.By controlling first switch S1 and second switch S2, make amplifier AMP charged in certain phase (or
Electric discharge), level is kept in another stage, then continues to charge on the basis of the level of holding, so reaches one and adds up
Process, realize the reinforcement of signal.When touching screen, equivalent capacity Cx can change, so that output signal VOUT electricity
Pressure changes, and detection signal receiving terminal to output signal VOUT by sampling, by the analysis to sampled signal, so that
Realize touch detection.
But just as previously said, still there is many weak points for detection method of touch screen of the prior art.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of detection method of touch screen, can realize low pressure, high noise
Than, circuit realiration is not only convenient for, and effectively.
In order to solve the above-mentioned technical problem, the present invention provides a kind of detection method of touch screen of low pressure high s/n ratio, and it is adopted
With the mode of low pressure parallel drive；The parallel drive refers to the drive signal transmitting terminal of the detection circuit of the touch-screen simultaneously
Transmission has two kinds of drive signals：The complete phase of phase of first signal and secondary signal, first signal and the secondary signal
Instead；By detecting SECO to the inside of the detection circuit, using the secondary signal as effective detection train of pulse letter
Number；The drive signal that the drive signal transmitting terminal is sent is made up of a series of detection burst signals, each inspection
Burst signal is surveyed to be made up of first signal or the secondary signal；
Wherein, the detection method of touch screen includes step：
A. within the period for sending the 1st detection burst signal, by the n-th drive signal transmitting terminal access detection electricity
Road, n are the sum of the drive signal transmitting terminal；
B. multiple detection signal receiving terminals of the detection circuit are sampled respectively successively；
C. within the period for sending the 2nd detection burst signal, the (n-1)th drive signal transmitting terminal is accessed into the detection
Circuit；
D. multiple detection signal receiving terminals of the detection circuit are sampled respectively successively；
E. by that analogy, until sending in the n-th period for detecting burst signal, by the 1st drive signal transmitting terminal
Access the detection circuit；
F. multiple detection signal receiving terminals of the detection circuit are sampled respectively successively.
Alternatively, after having performed above-mentioned steps F, a drive sent by each drive signal transmitting terminal is obtained
The form that signal programs respectively to each detection burst signal is moved, the invalid detection arteries and veins is denoted in the form
Rush string signal and the effective detection burst signal.
Alternatively, within the period of run-down, the detection burst signal that is included in the drive signal
Number is equal with the number of the drive signal transmitting terminal.
Alternatively, the number of the effective detection burst signal and the number of the invalid detection burst signal
It is equal.
Alternatively, in the table, 1 the effective detection burst signal is represented, 0 represents the invalid detection
Burst signal.
Compared with prior art, the present invention has advantages below：
To detect touch-screen, the present invention proposes a kind of mode of low pressure parallel drive, interacted by parallel signal
Integrated signal realize low pressure, the touch-screen detection technique of high s/n ratio, high drive can be substituted to believe to a certain extent
Number, signal to noise ratio is improved, while circuit is also easy to be integrated in chip internal.
Brief description of the drawings
The above and other features of the present invention, property and advantage will pass through retouching with reference to the accompanying drawings and examples
State and become readily apparent from, wherein：
Fig. 1 is a kind of schematic diagram of the used detection circuit of detection method of touch screen of the prior art；
Fig. 2 is that the first switch and second in the used detection circuit of a kind of detection method of touch screen shown in Fig. 1 is opened
The signal timing diagram of pass；
Fig. 3 is the decomposing schematic representation of the drive signal of the detection method of touch screen of one embodiment of the invention；
Fig. 4 is the drive signal transmitting terminal of the used detection circuit of detection method of touch screen of one embodiment of the invention
Drive signal waveform diagram；
Fig. 5 is the schematic flow sheet of the detection method of touch screen of one embodiment of the invention.
Embodiment
With reference to specific embodiments and the drawings, the invention will be further described, elaborates in the following description more
Details to facilitate a thorough understanding of the present invention, still the present invention obviously can be come with a variety of other manners different from this description it is real
Apply, those skilled in the art can make similar popularization according to practical situations in the case of without prejudice to intension of the present invention, drill
Unravel silk, therefore should not be limited the scope of the invention with the content of this specific embodiment.
In order to realize high s/n ratio, the thinking of detection method of touch screen of the invention is the side using low pressure parallel drive
Formula, parallel drive refers to the drive signal transmitting terminal (abbreviation TX ends) of the detection circuit of touch-screen while transmission has two kinds of driving letters
Number：First signal and secondary signal.Fig. 3 is that the decomposition of the drive signal of the detection method of touch screen of one embodiment of the invention is shown
It is intended to.As shown in figure 3, the phase of the first signal and secondary signal is completely opposite.By detecting sequential to the inside for detecting circuit
Control, using secondary signal as effective detection burst signal.By the first signal and secondary signal with binary code 0 and 1 come
Represent, the effective burst signal that detects can be labeled as 1, and invalid detection burst signal can be labeled as 0.
Assuming that the detection burst signal for having three drive signal transmitting terminals (TX0, TX1, TX2) is (0,0,0) respectively, point
TX0, TX1, TX2 are not accessed into drive circuit, sampled in detection signal receiving terminal, because the pulse detection string signal is nothing
The pulse detection string signal of effect, so finger touches screen and do not influenceed on output signal with non-tactile screen.Drive signal is sent out
Sending end sends drive signal simultaneously, and adjacent two channel phases identical signal can be overlapped, and the signal of opposite in phase can be mutual
Weaken.Assuming that TX0, TX1, TX2 detection burst signal are (0,1,0), TX0, TX1, TX2 are accessed into drive circuit respectively,
Being sampled in detection signal receiving terminal, TX1 end signals are due to TX0 and TX2 influence, so TX1 is terminated into drive circuit,
Sampled in detection signal receiving terminal, finger touches influences very little with non-tactile on output signal, can be ignored.Assuming that TX1,
TX2, TX3 detection burst signal are (1,1,1), and TX0, TX1, TX2 are accessed into drive circuit respectively, are received in detection signal
End is sampled, and when TX2 is terminated into drive circuit, finger touches and the non-tactile variable quantity influenceed on output signal is maximum,
Effective detection signal, the calculating for coordinate can be used as.
Fig. 4 is the drive signal transmitting terminal of the used detection circuit of detection method of touch screen of one embodiment of the invention
Drive signal waveform diagram.As shown in figure 4, the drive signal that drive signal transmitting terminal is sent is by a series of detection pulses
String signal (detection string is referred to as in Fig. 4) composition, each detection burst signal is by the first signal or secondary signal structure
Into.Within the period of run-down, the number n and drive signal transmitting terminal of the detection burst signal included in drive signal
(TX) number is equal.The period of run-down is as shown in figure 4, i.e. drive signal detects burst signal (i.e. from sending the 1st
Detection string is 1) to the n-th detection burst signal (i.e. detection string n) time.
Fig. 5 is the schematic flow sheet of the detection method of touch screen of one embodiment of the invention.With drive signal transmitting terminal TX
Exemplified by=11, detection signal receiving terminal RX=8, the detection method of touch screen of the present embodiment can include：
Step S501 is performed, within the period for sending the 1st detection burst signal, by the 11st drive signal transmitting terminal
TX11 detection circuit for access；
Step S502 is performed, successively to multiple detection signal receiving terminals (abbreviation RX ends) RX1, RX2 ... RX8 of detection circuit
Sampled respectively；
Step S503 is performed, within the period for sending the 2nd detection burst signal, by the 10th drive signal transmitting terminal
TX10 detection circuit for access；
Step S504 is performed, multiple detection signal receiving terminal RX1, RX2 ... the RX8 for detecting circuit are adopted respectively successively
Sample；
Step S505 is performed, by that analogy, until within the period for sending the 11st detection burst signal, the 1st is driven
Dynamic signal sending end TX1 detection circuit for access；
Step S506 is performed, multiple detection signal receiving terminal RX1, RX2 ... the RX8 for detecting circuit are adopted respectively successively
Sample.
After having performed above-mentioned steps S506, one can be obtained by each drive signal transmitting terminal TX1 ... TXn transmissions
Drive signal denotes invalid inspection to each form (as shown in following table one) for programming respectively of detection burst signal in table one
Survey burst signal and effective detection burst signal.Wherein, 1 represent effective detection burst signal, 0 represent it is invalid
Detect burst signal.The number of effective detection burst signal and the number of invalid detection burst signal are equal
's.
Table one
This programming mode not only can effectively detect to touch the position of touch-screen, the superposition between synchronous signal
Greatly improve signal to noise ratio.On the other hand, it is desirable to the number of effective detection burst signal and invalid detection train of pulse
The number of signal is of substantially equal, can so realize load balance, is advantageous to the stability of system.
The present invention realizes low pressure height by carrying out coding output to drive signal by way of signal interphase interaction
The touch screen detection of signal to noise ratio.
In summary, to detect touch-screen, the present invention proposes a kind of mode of low pressure parallel drive, passes through parallel signal
The integrated signal of interaction realizes low pressure, the touch-screen detection technique of high s/n ratio, can substitute height to a certain extent
Drive signal is pressed, improves signal to noise ratio, while circuit is also easy to be integrated in chip internal.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area skill
Art personnel without departing from the spirit and scope of the present invention, can make possible variation and modification.Therefore, it is every without departing from
The content of technical solution of the present invention, any modification made according to technical spirit of the invention to above example, equivalent variations
And modification, each fall within the protection domain that the claims in the present invention are defined.
Claims (3)
1. a kind of detection method of touch screen of low pressure high s/n ratio, it is by the way of low pressure parallel drive；The parallel drive
Refer to the drive signal transmitting terminal of the detection circuit of the touch-screen（TX）Sending simultaneously has two kinds of drive signals：First signal and
Secondary signal；By detecting SECO to the inside of the detection circuit, using the secondary signal as effective detection arteries and veins
Rush string signal；The drive signal transmitting terminal（TX）The drive signal sent is made up of a series of detection burst signals,
Each detection burst signal is made up of first signal or the secondary signal；
Wherein, first signal and the secondary signal carry out coding output with binary code；In the period of run-down
It is interior, the number n and drive signal transmitting terminal of the detection burst signal included in the drive signal（TX）Number it is equal；
In each driver' s timing, drive signal cyclic shift 1；The phase of first signal and the secondary signal completely on the contrary,
If adjacent dry passage sends identical useful signal, other passages send the first signal or secondary signal, and effective institute
The number for stating the number for detecting burst signal and the invalid detection burst signal is equal.
2. the detection method of touch screen of low pressure high s/n ratio according to claim 1, it is characterised in that also include：Obtain
One by each drive signal transmitting terminal（TX1…TXn）The drive signal sent is to each detection train of pulse
The form that signal programs respectively, the invalid detection burst signal and the effective detection arteries and veins are denoted in the form
Rush string signal.
3. the detection method of touch screen of low pressure high s/n ratio according to claim 2, it is characterised in that in the form
In, 1 represents the effective detection burst signal, and 0 represents the invalid detection burst signal.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106775161B (en) * | 2016-12-28 | 2020-04-21 | 厦门天马微电子有限公司 | Touch display panel, driving method and touch display device |
| US10175839B2 (en) * | 2016-12-30 | 2019-01-08 | Qualcomm Incorporated | Highly configurable front end for touch controllers |
| CN107102779B (en) * | 2017-06-06 | 2020-02-07 | 上海天马微电子有限公司 | Display panel, control method thereof and display device |
| CN109450423B (en) * | 2018-09-30 | 2022-04-05 | 深圳市爱协生科技有限公司 | Transmitting circuit and touch screen equipment |
| CN110865258B (en) * | 2019-11-28 | 2022-02-22 | 西安中颖电子有限公司 | Key detection circuit and key detection method for segmented comparison by using multiple thresholds |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102375607A (en) * | 2010-08-23 | 2012-03-14 | 索尼公司 | Touch detecting function display apparatus, driving circuit, driving method of touch detecting function display apparatus and electronic equipment |
| CN102511026A (en) * | 2009-09-30 | 2012-06-20 | 夏普株式会社 | Display device |
| CN202904521U (en) * | 2011-12-06 | 2013-04-24 | 苹果公司 | Integrated touch screen |
| CN103279248A (en) * | 2013-06-06 | 2013-09-04 | 敦泰科技有限公司 | Integrated touch organic light-emitting diode display device |
| CN103294320A (en) * | 2013-06-06 | 2013-09-11 | 敦泰科技有限公司 | Capacitive touch screen and manufacturing method thereof |
| CN103314345A (en) * | 2010-12-28 | 2013-09-18 | 夏普株式会社 | Touch panel system and electronic device |
| CN103703434A (en) * | 2011-06-22 | 2014-04-02 | 夏普株式会社 | Touch panel system and electronic device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101090254B1 (en) * | 2004-11-22 | 2011-12-06 | 삼성전자주식회사 | Display device including sensing element |
| US7812827B2 (en) * | 2007-01-03 | 2010-10-12 | Apple Inc. | Simultaneous sensing arrangement |
| JP5191452B2 (en) * | 2009-06-29 | 2013-05-08 | 株式会社ジャパンディスプレイウェスト | Touch panel drive method, capacitive touch panel, and display device with touch detection function |
| US8766931B2 (en) * | 2010-07-16 | 2014-07-01 | Perceptive Pixel Inc. | Capacitive touch sensor having code-divided and time-divided transmit waveforms |
| US11320946B2 (en) * | 2011-04-19 | 2022-05-03 | Cypress Semiconductor Corporation | Capacitive panel scanning with reduced number of sensing circuits |
| KR101895883B1 (en) * | 2011-11-09 | 2018-09-10 | 삼성전자 주식회사 | Method and apparatus for improving touch sensitivity of touchscreen panel |
| CN102736965B (en) * | 2012-05-23 | 2016-02-03 | 敦泰科技有限公司 | A kind of method and apparatus driving detection based on capacitive touch screen |
| KR101327451B1 (en) * | 2013-04-25 | 2013-11-11 | 주식회사 아나패스 | Method of reducing effect of noise and apparatus for detecting touch using the same |
-
2014
- 2014-12-22 CN CN201410811742.2A patent/CN104461151B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102511026A (en) * | 2009-09-30 | 2012-06-20 | 夏普株式会社 | Display device |
| CN102375607A (en) * | 2010-08-23 | 2012-03-14 | 索尼公司 | Touch detecting function display apparatus, driving circuit, driving method of touch detecting function display apparatus and electronic equipment |
| CN103314345A (en) * | 2010-12-28 | 2013-09-18 | 夏普株式会社 | Touch panel system and electronic device |
| CN103703434A (en) * | 2011-06-22 | 2014-04-02 | 夏普株式会社 | Touch panel system and electronic device |
| CN202904521U (en) * | 2011-12-06 | 2013-04-24 | 苹果公司 | Integrated touch screen |
| CN103279248A (en) * | 2013-06-06 | 2013-09-04 | 敦泰科技有限公司 | Integrated touch organic light-emitting diode display device |
| CN103294320A (en) * | 2013-06-06 | 2013-09-11 | 敦泰科技有限公司 | Capacitive touch screen and manufacturing method thereof |
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Address after: 710075 Kam Road No. 70, Xi'an high tech Zone, Shaanxi Province, 2 Patentee after: XI'AN ZHONGYING ELECTRONIC CO., LTD. Address before: 710075 Xi'an Software Park, Xi'an Software Park, Han Yun Pavilion A202, Xi'an hi tech Zone, Xi'an City, Shaanxi Patentee before: XI'AN ZHONGYING ELECTRONIC CO., LTD. |