CN110188014A - A kind of anti-interference test method for capacitive touch screen - Google Patents
A kind of anti-interference test method for capacitive touch screen Download PDFInfo
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- CN110188014A CN110188014A CN201910454553.7A CN201910454553A CN110188014A CN 110188014 A CN110188014 A CN 110188014A CN 201910454553 A CN201910454553 A CN 201910454553A CN 110188014 A CN110188014 A CN 110188014A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/2205—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested
- G06F11/2221—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested to test input/output devices or peripheral units
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/26—Functional testing
- G06F11/273—Tester hardware, i.e. output processing circuits
- G06F11/2733—Test interface between tester and unit under test
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/24—Arrangements for testing
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Abstract
The invention discloses a kind of anti-interference test methods for capacitive touch screen, this method generates white noise using function generator, input handset charging end ground potential, mobile phone capacitive touch screen is obtained by adb debugging method using the end PC and returns to capacitance value data and the end PC acquisition mobile phone touch point position data, judge whether to generate interference effect by observation capacitive touch screen and PC end data, so that the anti-interference ability to capacitive touch screen is tested.Method of the invention is easy to operate, is able to detect Android mobile phone capacitive touch screen to the anti-interference ability of charging signals ground potential noise, to guarantee mobile phone capacitive touch screen in the normal work in a variety of places.
Description
Technical field
The invention belongs to the field of test technology, are related to a kind of anti-interference test method for capacitive touch screen.
Background technique
Capacitive touch screen is the important component of touch-screen system.Capacitive touch screen usually has materials at two layers structure
At one layer is glass-top layer, and one layer is ITO insulating layer, and centre is equipped with the component of X and Y-axis.When finger or with the object of charge
When body contact screen, touch point electric field is caused to change, so that capacitor be caused to change, by can be with after amplifying return signal
Detect the variation of capacitance to detect touch.
Two o'clock touch-control at most may be implemented, no in the method that early stage capacitive touch screen uses induction electrode self-capacitance
It can veritably realize that multi-point touch, projection-type capacitive touch screen carry out cross scan by cross scan technology, to all electrodes,
Multi-point touch may be implemented, in addition, projection-type capacitive touch screen more minimizes, light transmittance has been more than 85%, and display effect is clear
It is clear, it lasts a long time, the operation is stable, nowadays becomes the primary selection of smart phone and tablet computer, be the mainstream of future development.
But there is also some disadvantages for projection-type capacitive touch screen.Projection-type capacitive touch screen induction is charge letter
Number, there is electromagnetic interference in external environment, electronic equipment internal can also have electrostatic and electromagnetic interference, when interfering larger,
Capacitance touch screen be likely to occur irregular working the case where, possibly can not detect the position of touch point, i.e., user be touched
Without response, it is also possible to the case where error detection occur, that is, the touch point position detected is different from practical touch point position.
The noise of touch screen mainly has internal controller noise and external noise source.External noise includes LCD display, electricity
Source, mobile phone radio frequency etc..The especially interference of charging signals generation, may cause mobile phone capacitive touch screen can not work normally.
In the actual use of smart phone, occurs the report of terrible hand phenomenon about mobile phone capacitive touch screen, specific phenomenon is
Mobile phone touch screen when the places such as train are charged can not work normally, and occur without response or mistaken touch phenomenon.
To sum up, during mobile phone R&D and production, need to improve the anti-interference test of capacitive touch screen.
Summary of the invention
The present invention proposes a kind of anti-interference test method for capacitive touch screen, is used for testing capacitor formula touch screen pair
The anti-interference ability of noise in external charging signal, since the places such as train charging ground potential is unstable, which can
To prevent the equipment such as mobile phone from can not work normally in this kind of place of train, it such as can't detect touch or touch point offset occur,
Guarantee the usage experience of user.
A kind of anti-interference test method for capacitive touch screen of the invention, is able to detect Android mobile phone capacitive touch
Screen is touched to the anti-interference ability of charging signals ground potential noise, guarantees that mobile phone capacitive touch screen can be normal in a variety of places
Work.For test method as shown in Figure 1, generating white noise using function generator, input handset charging end ground potential observes capacitor
Formula touch screen and PC end data judge whether to generate interference effect.
This method is specific as follows:
Step 1: adjustment function generator, setting waveform be white noise, frequency f, the preferred 800Hz of the white noise acoustic frequency,
Peak-to-peak value is 20Vpp or more；
Step 2: contiguous function generator and mobile phone: production connecting line draws the end the USB ground wire of mobile phone charging wire, even
Function generator output signal anode is connect, the other end connects mobile phone charging interface；
Step 3: mobile phone-downloaded drawing board application program, for showing capacitive touch screen return position point；
The end step 4:PC connects mobile phone by adb debugging tool, and concrete mode can use as follows:
Adb debugging enironment is installed at the end step 4.1:PC, and mobile phone is connect by data line with PC, and usb is opened in mobile phone terminal setting
Debugging, and agree to the end PC debugging request；
Step 4.2:PC checks the equipment having connected in end, it can be seen that the cell phone apparatus of aforementioned connection, then by computer and
Mobile phone is connected in the same WLAN, checks mobile phone IP address in mobile phone terminal, what the end PC was instructed and obtained by adb
IP address connects mobile phone, checks that the end PC connection equipment illustrates to set by the end connection PC wifi and mobile phone there are two equipment at this time
Standby success, data line can be extracted, and carry out adb debugging.
The end step 5:PC obtains mobile phone capacitive touch screen by adb debugging method and returns to capacitance value data, and method is usual
It is as follows:
Step 5.1: in acquisition data time, being instructed by adb and copy to touch screen capacitance value data file
In sdcard；
Step 5.2: after having acquired data, the touch screen capacitance value data file of preservation being transmitted to the end PC, by capacitance
Mobile phone each point capacitance extracts in data file, accesses as csv file, so as to post-processing；
Step 5.3: reading capacitance csv file, draw a contour line figure, convenient for observation mobile phone each point capacitance；
The end step 6:PC obtains mobile phone touch point position data, and method can use as follows:
The end step 6.1:PC instructs the touch point position for obtaining capacitance touch screen and detecting by adb, and saves as the end PC
Ts.txt file；
Data representation format is the positional format in mobile phone event system in step 6.2:ts.txt file, need by
Data, which are converted to 10 systems and carry out ratio again, is converted to screen position coordinate；
Step 7: in function generator non-output signal, finger touches capacitance plate center, obtains capacitance touch
The each point capacitance value data of screen, this group of data are as a control group；
Step 8: function generator exports the signal being arranged, and whether observation capacitance plate works normally, and judges whether normal
The method of work is as follows:
Step 8.1: opening drawing board application, slided on capacitance plate with hand, see whether that whether there is or not touch points, false touch point；
Step 8.2: hand touches capacitance plate center, obtains capacitance plate each point capacitance at this time, makes comparisons with control group, electricity
Capacitance variable quantity can be judged as touch point after beyond threshold value, the capacitance variation amount at each non-tactile point be observed, if electric
Capacitance variable quantity is less than threshold value, and the variable quantity is closer to threshold value, then capacitive screen of mobile phone anti-interference ability is poorer, if capacitance becomes
Change amount is more than threshold value, illustrates that capacitive screen of mobile phone anti-interference ability cannot be met the requirements；
Step 8.3: hand touches capacitance plate center, obtains touch screen at this time and returns to touch point position data, with practical touching
A position to be touched to make comparisons, test point position differs bigger with practical touch point position, then capacitive screen of mobile phone anti-interference ability is poorer,
Meanwhile test point position data variance is bigger in a period of time, then capacitive screen of mobile phone anti-interference ability is also poorer.
Step 9: the frequency f of Modification growth function generator output signal within the scope of 10Hz-10kHz repeats step 8.
The beneficial effects of the present invention are:
The present invention applies white noise acoustic jamming to the ground potential of mobile phone, obtains capacitance plate data feedback, and whether observation feedback is different
Often carry out testing mobile phone to the interference free performance of this kind of conflicting mode, if interference free performance is poor, touch screen return position point meeting
There is phenomena such as touch point missing, false touch point, certain location points will appear that capacitance is very big or minimum phenomenon on capacitance plate.It should
Method is easy to operate, and required equipment and instrument is commonly used equipment instrument, and detection effect is accurate, indicates hand by data quantitative
The anti-interference ability of machine capacitive touch screen is strong and weak.
Detailed description of the invention
Fig. 1 is anti-interference test method schematic diagram of the invention；
Fig. 2 is that capacitive touch screen each point capacitance is fed back in example；
Capacitance value data makees contour map when Fig. 3 is noiseless lower touch central point in example；Central area is finger touching
Place is touched, capacitance is minimum, can determine whether as touch point position；
Fig. 4 is to touch central point capacitance value data when acting on that is interfered in example to make contour map；Under interference in addition to
There are also multiple location point capacitances are minimum for finger touch place, it can be determined that is touch point, causes to return to touch point positional fault；
Fig. 5 is to touch the central point return position that is interfered when acting in example to map；Only have in screen practical touch point
The heart interferes the other false touch points of lower appearance.
Specific embodiment
Method of the invention is described further with example with reference to the accompanying drawing.
Method of the invention specifically:
Step 1: adjustment function generator, setting waveform are white noise, frequency f；
Step 2: contiguous function generator and mobile phone: the end the USB ground wire of mobile phone charging wire being drawn, contiguous function generator
Output signal anode, the other end connect mobile phone charging interface；
Step 3: mobile phone-downloaded drawing board application program, for showing capacitive touch screen return position point；
The end step 4:PC connects mobile phone by adb debugging tool；
The end step 5:PC obtains mobile phone capacitive touch screen by adb debugging method and returns to capacitance value data；
The end step 6:PC obtains mobile phone touch point position data；
Step 7: in function generator non-output signal, finger touches capacitance plate center, obtains capacitance touch
The each point capacitance value data of screen, this group of data are as a control group；
Step 8: function generator exports the signal being arranged, and whether observation capacitance plate works normally；
Step 8.1: opening drawing board application, slided on capacitance plate with hand, see whether that whether there is or not touch points, false touch point；
Step 8.2: hand touches capacitance plate center, obtains capacitance plate each point capacitance at this time, makes comparisons with control group, electricity
Capacitance variable quantity can be judged as touch point after beyond threshold value, the capacitance variation amount at each non-tactile point be observed, if electric
Capacitance variable quantity is less than threshold value, and the variable quantity is closer to threshold value, then capacitive screen of mobile phone anti-interference ability is poorer, if capacitance becomes
Change amount is more than threshold value, illustrates that capacitive screen of mobile phone anti-interference ability cannot be met the requirements；
Step 8.3: hand touches capacitance plate center, obtains touch screen at this time and returns to touch point position data, with practical touching
A position to be touched to make comparisons, test point position differs bigger with practical touch point position, then capacitive screen of mobile phone anti-interference ability is poorer,
Meanwhile test point position data variance is bigger in a period of time, then capacitive screen of mobile phone anti-interference ability is also poorer.
Step 9: the frequency f of Modification growth function generator output signal within the scope of 10Hz-10kHz repeats step 8.
It is specific by taking certain Android mobile phone as an example:
1, the end PC connects mobile phone by wifi
(1) adb environment is installed at the end PC, and data line connects mobile phone, and mobile phone terminal agrees to debugging request, the input order of the end PC:
Adb devices checks connected device；It is as follows:
List of devices attached
Y2J7N17825002260 device
(2) PC and mobile phone are connected in same WLAN, the input instruction of the end PC: adb connect mobile phone IP address,
Mobile phone is connected, checks connected device again, if it exists two equipment, then passes through wifi successful connection.
2, the end PC obtains mobile phone capacitive touch screen by adb debugging method and returns to capacitance value data
(1) it acquires in data time, the input instruction of the end PC: crosses (the touch screen capacitance value data file road adb shell cp
Diameter)/proc/touchscreen/tp_capacitance_data (touch screen capacitance value data path is accessed in sdcard)/
Touch screen capacitance log file is stored in sdcard by mnt/sdcard/log/log $ 1；
(2) after having acquired data, the input instruction of the end PC: adb pull/mnt/sdcard/log/log $ a adb will be saved
Capacitance value data file be transmitted to the end PC, mobile phone each point capacitance in capacitance value data file is extracted, is accessed as csv
File；
3, the end PC obtains mobile phone touch point position data
The end PC input instruction: adb shell getevent | grep-e " 0035 "-e " 0036 " > ts.txt, by touch point
Position data is saved in ts.txt file；
4, format is converted to screen position coordinate
Input instruction first: adb shell getevent-p finds 0035 and 0036 be expert at letter in type information
Breath,
It is as follows:
0035:value 0, min 0, max 1440, fuzz 0, flat 0, resolution 0
0036:value 0, min 0, max 2560, fuzz 0, flat 0, resolution 0
Obtaining width (0035) max is 1440, and height (0036) max is 2560；
The mobile phone screen resolution ratio is 1080*1920, calculates ratio
W=1080/1440=0.75
H=1920/2560=0.75
It is converted after obtaining location information, such as:
/dev/input/event5:0003 0035 000001e3
/dev/input/event5:0003 0036 00000149
Being converted to the decimal system is (483,329), then carries out ratio conversion:
483*W=362.25
329*H=246.75
So screen position coordinate is (362,247)
Claims (6)
1. a kind of anti-interference test method for capacitive touch screen, which comprises the steps of:
Step 1: adjustment function generator, setting waveform are white noise, frequency f；
Step 2: contiguous function generator and mobile phone: the end the USB ground wire of mobile phone charging wire is drawn, the output of contiguous function generator
Signal anode, the other end connect mobile phone charging interface；
Step 3: mobile phone-downloaded drawing board application program, for showing capacitive touch screen return position point；
The end step 4:PC connects mobile phone by adb debugging tool；
The end step 5:PC obtains mobile phone capacitive touch screen by adb debugging method and returns to capacitance value data；
The end step 6:PC obtains mobile phone touch point position data；
Step 7: in function generator non-output signal, finger touches capacitance plate center, obtains capacitive touch screen
Each point capacitance value data, this group of data are as a control group；
Step 8: function generator exports the signal being arranged, and whether observation capacitance plate works normally,
Step 9: the frequency f of Modification growth function generator output signal within the scope of 10Hz-10kHz repeats step 8.
2. the anti-interference test method according to claim 1 for capacitive touch screen, which is characterized in that in step 8
The method whether observation capacitance plate works normally is as follows:
Step 8.1: opening drawing board application, slided on capacitance plate with hand, see whether that whether there is or not touch points, false touch point；
Step 8.2: hand touches capacitance plate center, obtains capacitance plate each point capacitance at this time, makes comparisons with control group, capacitance
Variable quantity can be judged as touch point after beyond threshold value, the capacitance variation amount at each non-tactile point be observed, if capacitance
Variable quantity is less than threshold value, and the variable quantity is closer to threshold value, then capacitive screen of mobile phone anti-interference ability is poorer, if capacitance variation amount
More than threshold value, illustrates that capacitive screen of mobile phone anti-interference ability is poor, cannot meet the requirements；
Step 8.3: hand touches capacitance plate center, obtains touch screen at this time and returns to touch point position data, with practical touch point
Position is made comparisons, and test point position differs bigger with practical touch point position, then capacitive screen of mobile phone anti-interference ability is poorer, together
When, test point position data variance is bigger in a period of time, then capacitive screen of mobile phone anti-interference ability is also poorer.
3. the anti-interference test method according to claim 1 for capacitive touch screen, which is characterized in that in step 1
The preferred 800Hz of white noise acoustic frequency, peak-to-peak value are 20Vpp or more.
4. the anti-interference test method according to claim 1 for capacitive touch screen, which is characterized in that in step 4
The end PC connects mobile phone by adb debugging tool, and concrete mode is as follows:
Adb debugging enironment is installed at the end step 4.1:PC, and mobile phone is connect by data line with PC, and usb debugging is opened in mobile phone terminal setting,
And agree to the end PC debugging request；
Step 4.2:PC checks the equipment having connected in end, then PC and mobile phone is connected in the same WLAN, in hand
Generator terminal checks mobile phone IP address, and the end PC connects mobile phone with the IP address obtained by adb instruction, checks that the connection of the end PC is set at this time
It is standby, there are two equipment, illustrate to extract data line by the end connection PC wifi and cell phone apparatus success, carry out adb tune
Examination.
5. the anti-interference test method according to claim 1 for capacitive touch screen, which is characterized in that in step 5
The end PC obtains mobile phone capacitive touch screen by adb debugging method and returns to capacitance value data, the method is as follows:
Step 5.1: in acquisition data time, being instructed by adb and copy to touch screen capacitance value data file in sdcard；
Step 5.2: after having acquired data, the touch screen capacitance value data file of preservation being transmitted to the end PC, by capacitance value data
Mobile phone each point capacitance extracts in file, accesses as csv file；
Step 5.3: reading capacitance csv file, draw a contour line figure, convenient for observation mobile phone each point capacitance.
6. the anti-interference test method according to claim 1 for capacitive touch screen, which is characterized in that in step 6
The end PC obtains mobile phone touch point position data, the method is as follows:
The end step 6.1:PC instructs the touch point position for obtaining capacitance touch screen and detecting by adb, and saves as the end PC
Ts.txt file；
Data representation format is the positional format in mobile phone event system in step 6.2:ts.txt file, is needed data
It is converted to 10 systems and carries out ratio again and be converted to screen position coordinate.
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| CN104423753B (en) * | 2013-09-10 | 2017-07-04 | 深圳市启望科文技术有限公司 | A kind of capacitance touch detection method, device and mobile terminal |
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2019
- 2019-05-29 CN CN201910454553.7A patent/CN110188014A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001042856A2 (en) * | 1999-12-07 | 2001-06-14 | Creoscitex Corporation Ltd. | A method and a plate for digitally-imaged offset printing |
| CN102222031A (en) * | 2011-03-25 | 2011-10-19 | 苏州瀚瑞微电子有限公司 | Touch device testing method |
| CN103018594A (en) * | 2012-11-30 | 2013-04-03 | 深圳市汇顶科技股份有限公司 | Capacitive touch screen testing method and system, and electronic equipment |
| CN104423753B (en) * | 2013-09-10 | 2017-07-04 | 深圳市启望科文技术有限公司 | A kind of capacitance touch detection method, device and mobile terminal |
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