CN109444608A - A kind of detection of touch screen static discharge and guard method - Google Patents
A kind of detection of touch screen static discharge and guard method Download PDFInfo
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- CN109444608A CN109444608A CN201811549899.7A CN201811549899A CN109444608A CN 109444608 A CN109444608 A CN 109444608A CN 201811549899 A CN201811549899 A CN 201811549899A CN 109444608 A CN109444608 A CN 109444608A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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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 invention discloses a kind of detection of touch screen static discharge and guard methods; comprising: ESD detecting step; when current touch data generate touch point when previous frame touch data no touch point; signature analysis is carried out to point data is touched; and when judging current touch data is that ESD interferes data, ESD filter step is executed；ESD filter step, abnormal data is counted caused by being filtered out by preset filtering algorithm because of ESD interference.The data phenomenon analysis that the present invention influences touch screen from ESD impact solves the unsolved touch screen ESD interference problem of hardware.Meanwhile by software algorithm, ESD interference can be detected accurately, and do corresponding filtering and optimizing stability, promote another level of touch screen ESD interference optimization effectively.Compared to existing technologies, the present invention can prevent touch screen from operation irregularity occurs when by ESD impact, to solve touch screen ESD interference problem, substantially increase the ESD performance of touch screen.
Description
Technical field
The present invention relates to touch screen more particularly to a kind of detections of touch screen static discharge and guard method.
Background technique
With the development of smart phone and equipment, capacitance touch screen products using more and more extensive.It is primarily due to
Capacitive touch screen is sturdy and durable, reaction speed is fast and has good experience effect.It especially applies in smart phone product
On, the touch experience effect of capacitive touch screen is annotated well.We can frequently contact smart phone daily, more very
To it may be said that smart phone has become a part of our lives, it may also be said to which capacitive touch screen has become us and lives
A part.Therefore, the stability of capacitive touch screen ESD also naturally becomes everybody focus of attention, or even has been electricity
The rigid index of appearance formula touch screen.When capacitive touch screen is by ESD impact, if touch screen ESD performance is poor, by ESD
It is easy for occurring touching being failure to actuate or touching after impact tampering work etc. operation irregularity phenomenon.Deal with improperly influences to make very much
With.How to detect and protect the ESD of capacitive touch screen to interfere is a urgent problem to be solved.
In the prior art, when capacitive touch screen is by ESD impact, touch screen occur dapping point (malfunction often said),
Touch screen freezes screen (touching reactionless) and touches chip fever etc. touch screen operation irregularity phenomenon.Common practice has: 1, changing
The hardware of version hardware optimization capacitance touch screen, conductive power of the enhancing capacitance touch screen to the filtering strength of ESD and over the ground；2, correcting
Chip optimization touch chip anti-ESD performance, improve the anti-ESD ability of chip, prevent cause because of ESD impact chip without
Method work.To protect capacitive touch screen not interfered or reduced ESD interference by ESD.But the prior art be primarily present with
Lower defect:
It is interacted firstly, increasing capacitive touch screen with touch screen host touch information, the effective inspection for improving touch screen ESD
Survey and protective value, but increase the complexity that touch screen host touches driving logic, increase the work of host driven engineer
It measures；
Secondly, according to capacitance touch screen by the mode of ESD impact data characteristic identification capacitance touch screen ESD, it can be accurate
Detect screen body ESD impact, provide good foundation for the ESD protection algorism of touch screen.But if touch screen is met
To it is extraneous other it is strong interfere, when the data of touch detection are similar with ESD detection data when interference, easily cause ESD detection mistake
Inspection.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the deficiencies of the prior art, touch screen can be prevented by providing one kind
Operation irregularity occurs when by ESD impact, to solve touch screen ESD interference problem, and improves the touch screen of ESD performance
Static discharge detection and guard method.
In order to solve the above technical problems, the present invention adopts the following technical scheme that.
A kind of detection of touch screen static discharge and guard method comprising: ESD detecting step, when previous frame touch data
When no touch point and current touch data generate touch point, signature analysis is carried out to point data is touched, and judging currently to touch
Touch data be ESD interfere data when, execute ESD filter step；ESD filter step is filtered out by preset filtering algorithm because of ESD
The points of abnormal data caused by interfering.
Preferably, the ESD detecting step comprises the following processes: step S10 is expert at for current point, and statistics is each
The data value of node data is greater than the number CountA of preset threshold THA, wherein the threshold value THA is ESD data characteristics threshold
Value；Step S11, calculate be greater than the position threshold value THA lastrow and all data of next line and SumA, and statistics institute
There is the number CountB of data, and calculates average value AvgVal=SumA/CountB；Whether step S12 judges number CountA
Greater than preset ESD data characteristics number threshold value EsdDataNum；It is default to judge whether average value AvgVal is less than by step S13
Threshold value THB, wherein the threshold value THB be non-ESD data characteristics threshold value；Step S14, if step S12's and step S13 sentences
Disconnected result is "Yes", then detection show that current frame data is that ESD interferes data.
Preferably, the ESD filter step includes: step S20, adds touch point filtering algorithm, touches number in previous frame
Under conditions of no touch point, count if present frame touch data points are greater than previous frame, in preset filtering frame number
It is the points of previous frame that current points are kept under FilterNum；Step S21, after detecting ESD disturbance state, according to current
The lastrow and next line data characteristics of point, set touch point data filtering frame number FilterNum；Step S22, it is described
Filtering algorithm is according to filtering frame number FilterNum, and abnormal data is counted caused by filtering out because of ESD interference, to eliminate ESD interference
Dap a phenomenon.
Preferably, the ESD filter step further include: step S23, statistics ESD interference data continue frame number, if ESD is dry
The holding frame number for disturbing data is greater than preset holding frame number threshold value EsdKeepNum, then judges the analog circuit of touch screen chip
Work exists abnormal.
Preferably, further include having touch screen and touch screen host cross protection step: step S30, increase for touch screen chip
Add the interface PortA of a touch screen host read/writable, the touch screen host timing carries out read operation to PortA and writes behaviour
Make；Whether step S31, the PortA value that the touch screen host judges that it is read are consistent with updated value, if be not consistent, sentence
There is idle dead phenomenon of extension because of ESD impact in disconnected touch screen out；Step S32, the touch screen host pass through hardware controls
Touch screen is resetted, to enable the touch screen chip rearming.
The detection of touch screen static discharge and guard method disclosed by the invention, the beneficial effect is that, the present invention is rushed from ESD
The data phenomenon analysis influenced on touch screen is hit, solves the unsolved touch screen ESD interference problem of hardware.Meanwhile passing through
Software algorithm can accurately detect ESD interference, and do corresponding filtering and optimizing stability, make touch screen ESD interference optimization
Another level effectively promoted.Compared to existing technologies, the present invention can prevent touch screen hair when by ESD impact
Raw operation irregularity substantially increases the ESD performance of touch screen to solve touch screen ESD interference problem.
Detailed description of the invention
Fig. 1 is mutual capacitance touchscreens structural schematic diagram；
Fig. 2 is the flow chart of filtering algorithm；
Fig. 3 is the interface PortA configuration flow figure of touch screen；
Fig. 4 is the read-write flow chart that host docks mouth PortA.
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawings and examples.
The invention discloses a kind of detection of touch screen static discharge and guard methods comprising:
ESD detecting step, when current touch data generate touch point when previous frame touch data no touch point, to touch
Point data carries out signature analysis, and when judging current touch data is that ESD interferes data, executes ESD filter step；
ESD filter step, abnormal data is counted caused by being filtered out by preset filtering algorithm because of ESD interference.
The detection of touch screen static discharge and guard method disclosed by the invention, the beneficial effect is that, the present invention is rushed from ESD
The data phenomenon analysis influenced on touch screen is hit, solves the unsolved touch screen ESD interference problem of hardware.Meanwhile passing through
Software algorithm can accurately detect ESD interference, and do corresponding filtering and optimizing stability, make touch screen ESD interference optimization
Another level effectively promoted.Compared to existing technologies, the present invention can prevent touch screen hair when by ESD impact
Raw operation irregularity substantially increases the ESD performance of touch screen to solve touch screen ESD interference problem.
In a preferred embodiment of the invention, referring to Figure 1, in mutual capacitance touchscreens body, in which: TX1, TX2 and TX3
For driving signal end, RX1, RX2, RX3, RX4, RX5 and RX6 are inductive signal receiving end；
{D11,D12,D13,D14,D15,D16,D21,D22,D23,D24,D25,D26,D31,D32,D33,D34,D35,
D36 } it is that each node data of touch screen incudes variable quantity.
Further, the ESD detecting step comprises the following processes:
Step S10, is expert at for current point, counts of the data value greater than preset threshold THA of each node data
Number CountA, wherein the threshold value THA is ESD data characteristics threshold value；
Step S11, calculate be greater than the position threshold value THA lastrow and all data of next line and SumA, and
The number CountB of all data is counted, and calculates average value AvgVal=SumA/CountB；
Step S12, judges whether number CountA is greater than preset ESD data characteristics number threshold value EsdDataNum；
Step S13, judges whether average value AvgVal is less than preset threshold value THB, wherein the threshold value THB is non-ESD
Data characteristics threshold value；
Step S14, if the judging result of step S12 and step S13 are "Yes", detection show that current frame data is
ESD interferes data.
In actual application, it is a moment impact signal that ESD, which interferes touch screen, and usually performance is that strong interference exists
On RXn (some inductive signal receiving end) signal of some TXn (some driving signal) driving direction；And it normally touches
Usually cover more than one channel width.This feature that touch screen interferes explains touch data using ESD, arranges
ESD detection method.
Below for example, in the ESD detecting step of the present embodiment: not finding to touch in previous frame touch data
Point, and touch point data characteristics is analyzed in the case where current touch data discovery touch point:
Firstly, such as point A (2,3) be current point position, statistics A point be expert at each node data D21, D22, D23,
D24, D25, D26 } data value is greater than the number CountA of given threshold THA (ESD data characteristics threshold value) and (it is special to be greater than ESD data
Levy the number of threshold value)；If data D22, D23, D24 and D25 are greater than THA, of CountA D22, D23, D24 and D25
Number, i.e. CountA=4；
Secondly, statistics be greater than the position threshold value THA lastrow and all data of next line and SumA (all data
And) with the number CountB (numbers of data) of data, and calculate average value AvgVal=SumA/CountB；For example, if
Data D22, D23, D24 and D25 are greater than THA, then SumA=D12+D13+D14+D15+D32+D33+D34+D35, and CountB
It is the data amount check of SumA summation, i.e. CountB=8；
Moreover, it is judged that CountA is greater than setting ESD data characteristics number threshold value EsdDataNum (ESD data characteristics number
Threshold value) it is whether true, while judging whether AvgVal is true less than given threshold THB (non-ESD data characteristics threshold value), if two
A condition is set up, then judges that current frame data interferes data for ESD.
Further, the ESD filter step includes:
Step S20 adds touch point filtering algorithm, under conditions of previous frame touch data no touch point, if currently
Frame touch data points are greater than previous frame and count, then it is upper one that current points are kept at preset filtering frame number FilterNum
The points of frame；
Step S21, after detecting ESD disturbance state, according to the lastrow of current point and next line data characteristics, to touching
Point data filtering frame number FilterNum is touched to be set；
Step S22, the filtering algorithm is according to filtering frame number FilterNum, abnormal data caused by filtering out because of ESD interference
Points, to eliminate the phenomenon that daps of ESD interference；
Step S23, statistics ESD interference data continue frame number, if the holding frame number of ESD interference data is greater than preset holding
It is abnormal then to judge that the analog circuit work of touch screen chip exists by frame number threshold value EsdKeepNum.
Below for example, in the ESD filter step of the present embodiment:
Firstly, increasing touch point filtering algorithm, filtering calculates process and refers to Fig. 2, the case where previous frame is touched without point
Under, if current points are greater than previous frame points, keep working as at the frame number FilterNum (frame number for needing to filter) of setting
Preceding points are the points of previous frame；
Secondly, after detecting ESD disturbance state, according to A point lastrow and next line data characteristics, that is, data D13
With the size of D33, touch point data filtering frame number FilterNum size is set；
Again, filtering algorithm is filtered out abnormal data points caused by ESD is interfered, is realized and eliminated by FilterNum numerical value
The phenomenon that daps of ESD interference solves the interference problem for causing touch screen accidentally to touch because of ESD interference；
In addition, statistics ESD interference data is also needed to continue frame number, because ESD interference is a moment impact signal, if
ESD data keep frame number to be greater than setting and keep frame number threshold value EsdKeepNum (setting keeps frame number threshold value), then speculate chip
There may be exceptions for analog circuit work, pass through the reset function reset chip of chip at this time.This is alternate item, there are this
ESD impact can open in the case where hanging dead phenomenon, and default can be closed to save resource and reduce ESD erroneous detection.
Based on the above principles, the invention also includes have touch screen and touch screen host cross protection step:
Step S30 increases the interface PortA of a touch screen host read/writable, the touch screen master for touch screen chip
Machine timing carries out read operation and write operation to PortA；
Step S31, whether the PortA value that the touch screen host judges that it is read is consistent with updated value, if be not consistent,
Then judge that touch screen has idle dead phenomenon of extension because of ESD impact；
Step S32, the touch screen host by hardware controls reset touch screen, with enable the touch screen chip again into
Enter working condition.
Below for example, the guard method that the touch screen is interacted with touch screen host specifically includes:
In conjunction with shown in Fig. 3 and Fig. 4, in the interface PortA (read/write for touching chip one touch screen host read/writable of increase
Interface), host timing is read and is write to PortA, and whether the value that PortA is read in host channel judgement is consistent with updated value, such as
Fruit, which is not consistent, speculates that touch screen may exist ESD impact and idle dead phenomenon of extension.For example, default or host timing are right
PortA writes 0x88, and every frame can all update adjustment PortA=0x66 when touch screen body running, and host channel judgement is read
The mode that PortA value and updated value (0x66) are not inconsistent, thus it is speculated that there may be ESD impacts to hang dead phenomenon for touch screen, leads to not just
The value of normal update PortA interface either causes touch panel communication interfaces abnormal and causes host that can not read correctly
PortA value；Touch screen is set to rework by drive control hardware reset touch screen at this time.And then it solves to draw because of ESD interference
It plays touch screen and touches unresponsive problem.
Touch screen static discharge detection disclosed by the invention and guard method, the beneficial effect obtained are, of the invention
The ESD performance for improving touch screen, effectively prevents touch screen when by ESD impact, influences because of touch screen operation irregularity
Product uses, and has better meet application demand, is suitble to promote and apply in touching screen products, and before having preferable application
Scape.
The above is preferred embodiments of the present invention, is not intended to restrict the invention, all in technology model of the invention
Interior done modification, equivalent replacement or improvement etc. are enclosed, should be included in the range of of the invention protect.
Claims (5)
1. a kind of touch screen static discharge detection and guard method characterized by comprising
ESD detecting step when current touch data generate touch point when previous frame touch data no touch point, is counted touching
According to progress signature analysis, and when judging current touch data is that ESD interferes data, ESD filter step is executed；
ESD filter step, abnormal data is counted caused by being filtered out by preset filtering algorithm because of ESD interference.
2. touch screen static discharge detection as described in claim 1 and guard method, which is characterized in that the ESD detection step
Suddenly it comprises the following processes:
Step S10, is expert at for current point, and the data value for counting each node data is greater than the number of preset threshold THA
CountA, wherein the threshold value THA is ESD data characteristics threshold value；
Step S11, calculate be greater than the position threshold value THA lastrow and all data of next line and SumA, and statistics
The number CountB of all data, and calculate average value AvgVal=SumA/CountB；
Step S12, judges whether number CountA is greater than preset ESD data characteristics number threshold value EsdDataNum；
Step S13, judges whether average value AvgVal is less than preset threshold value THB, wherein the threshold value THB is non-ESD data
Characteristic threshold value；
Step S14, if the judging result of step S12 and step S13 are "Yes", detection show that current frame data is dry for ESD
Disturb data.
3. touch screen static discharge detection as described in claim 1 and guard method, which is characterized in that the ESD filtering step
Suddenly include:
Step S20 adds touch point filtering algorithm, under conditions of previous frame touch data no touch point, if present frame touches
It touches data points and is greater than previous frame points, then keeping current points at preset filtering frame number FilterNum is previous frame
Points；
Step S21, after detecting ESD disturbance state, according to the lastrow of current point and next line data characteristics, to touch point
Data filtering frame number FilterNum is set；
Step S22, the filtering algorithm is according to filtering frame number FilterNum, exceptional data point caused by filtering out because of ESD interference
Number, to eliminate the phenomenon that daps of ESD interference.
4. touch screen static discharge detection as claimed in claim 3 and guard method, which is characterized in that the ESD filtering step
Suddenly further include:
Step S23, statistics ESD interference data continue frame number, if the holding frame number of ESD interference data is greater than preset holding frame number
It is abnormal then to judge that the analog circuit work of touch screen chip exists by threshold value EsdKeepNum.
5. touch screen static discharge detection as described in claim 1 and guard method, which is characterized in that further include having touch screen
With touch screen host cross protection step:
Step S30, increases the interface PortA of a touch screen host read/writable for touch screen chip, and the touch screen host is fixed
When read operation and write operation are carried out to PortA；
Whether step S31, the PortA value that the touch screen host judges that it is read are consistent with updated value, if be not consistent, sentence
There is idle dead phenomenon of extension because of ESD impact in disconnected touch screen out；
Step S32, the touch screen host resets touch screen by hardware controls, to enable the touch screen chip reenter work
Make state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811549899.7A CN109444608B (en) | 2018-12-18 | 2018-12-18 | Electrostatic discharge detection and protection method for touch screen |
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|---|---|---|---|
| CN201811549899.7A CN109444608B (en) | 2018-12-18 | 2018-12-18 | Electrostatic discharge detection and protection method for touch screen |
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Cited By (1)
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| CN112731012A (en) * | 2020-12-17 | 2021-04-30 | 展讯半导体(成都)有限公司 | Electrostatic discharge detection method and device |
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