CN109188143A - A kind of method and system detecting capacitive touch screen functional sheet - Google Patents
A kind of method and system detecting capacitive touch screen functional sheet Download PDFInfo
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- CN109188143A CN109188143A CN201811103067.2A CN201811103067A CN109188143A CN 109188143 A CN109188143 A CN 109188143A CN 201811103067 A CN201811103067 A CN 201811103067A CN 109188143 A CN109188143 A CN 109188143A
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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
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The present invention relates to a kind of method and system for detecting capacitive touch screen functional sheet, method includes the following steps, S1 detects the position of testing capacitance formula touch screen function piece, obtains location information；S2 controls detection device according to the positional information and contacts with testing capacitance formula touch screen function piece；S3 applies an excitation step signal to capacitive touch screen functional sheet to be measured by the detection device, and obtains reflected first voltage Wave data when the excitation step signal is transmitted in the induction electrode path of testing capacitance formula touch screen function piece；S4 judges whether testing capacitance formula touch screen function piece is non-defective unit by the first voltage Wave data.The present invention can quickly detect capacitive touch screen functional sheet, have on-line checking, work continuously, quickly detection, electric performance test can be moved to the functional sheet fabrication stage from the module group assembling stage using this system, to improve production efficiency by the characteristics of real-time information transmission.
Description
Technical field
The present invention relates to the detection fields of capacitive touch screen, and in particular to a kind of detection capacitive touch screen functional sheet
Method and system.
Background technique
Capacitive touch screen is a kind of human-computer interaction interface to grow up in recent years, is touched compared to traditional resistance-type
Screen, infrared type touch screen, electromagnetical type touch screen are touched, is more advantageous to and is matched with New Generation of Intelligent mobile phone, to realize the man-machine of complexity
Interactive function.For the core devices functional sheet in capacitive touch screen, primarily serve the effect of capacitance sensing, either which kind of
Perhaps conductive material is required to etch or burn certain pattern to realize this sensing function substrate.But for function
For the test of piece, mainly judge whether capacitance sensing performance is up to standard.The way of industry is that front end yellow light process carries out at present
Optical figuring compares and the drive integrated circult flexible circuit board of the functional sheet of small pieces and target product is passed through survey by rear end
It sounds out needle and carries out false connection, the pumping signal and sampled signal provided by drive integrated circult is tested, and judges the function
Piece whether non-defective unit.But the test of this mode carries out electrical testing in the front end yellow light stage like that without image of Buddha printed circuit board, no
Conducive to the implementation of automatic test and the raising of production efficiency.
Summary of the invention
Technical problem to be solved by the invention is to provide it is a kind of detect capacitive touch screen functional sheet method and system,
The test of automation may be implemented and improve production efficiency.
The technical scheme to solve the above technical problems is that a kind of side for detecting capacitive touch screen functional sheet
Method includes the following steps,
S1 detects the position of testing capacitance formula touch screen function piece, obtains location information；
S2 controls detection device according to the positional information and contacts with testing capacitance formula touch screen function piece；
S3 applies an excitation step signal to capacitive touch screen functional sheet to be measured by the detection device, and obtains
Reflected first when the excitation step signal is transmitted in the induction electrode path of testing capacitance formula touch screen function piece
Voltage waveform data；
S4 judges whether testing capacitance formula touch screen function piece is non-defective unit by the first voltage Wave data, and
In the case where testing capacitance formula touch screen function piece is not non-defective unit, testing capacitance formula is calculated by the first waveform data
The open circuit point or short dot in the induction electrode path of touch screen function piece.
The beneficial effects of the present invention are: a kind of method for detecting capacitive touch screen functional sheet of the present invention passes through to electricity to be measured
Appearance formula touch screen function piece position is detected, and drives probe mould group and testing capacitance formula touch screen according to the location information of detection
Functional sheet contact, test device are tested to obtain test data by probe mould group to capacitive touch screen functional sheet to be measured,
Host computer judges whether testing capacitance formula touch screen function piece is non-defective unit according to test data；The present invention can be detected quickly
Capacitive touch screen functional sheet has on-line checking, works continuously, and quickly detects, and the characteristics of real-time information transmission, is using this
Electric performance test can be moved to the functional sheet fabrication stage from the module group assembling stage by system, to improve production efficiency.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the S4 specifically,
The first voltage Wave data and pre-stored second voltage Wave data are carried out correlation calculations by S41,
Obtain relevance threshold；
Wherein, the second voltage waveform is induction of the excitation step signal in non-defective unit capacitive touch screen functional sheet
Reflected voltage waveform data when being transmitted in electrode path；
S42 judges whether testing capacitance formula touch screen function piece is non-defective unit according to the relevance threshold.
Beneficial effect using above-mentioned further scheme is: the present invention passes through the difference of comparison measurement results and standard value,
The quality of this measurement functional sheet is judged, in order to quickly judge using approximate angle value (correlation calculations) determining method.
Further, the formula of progress correlation calculations is in the S41,
Wherein, first voltage Wave data and second voltage Wave data are the data sequence of voltage and time, O
In the voltage amplitude of preset time point in two voltage waveform datas,For in second voltage Wave data in overall time section
Voltage amplitude average value, T be first voltage Wave data in preset time point voltage amplitude,For first voltage wave
The average value of voltage amplitude in graphic data in overall time section.
Beneficial effect using above-mentioned further scheme is: in order to quickly calculate, first calculating second voltage Wave data
In the voltage amplitude in overall time section average valueWith the electricity in first voltage Wave data in overall time section
The average value of pressure amplitude degreeAccording to the formula of correlation calculations, two very big sequences of data volume can be thus converted to
A numerical value between one 0~1, which is exactly correlation, and numerical value is bigger, then the product and non-defective unit measured is more similar, by
This can be simple and quick the quality for judging product to be measured.
Further, when testing capacitance formula touch screen function piece is substandard products, the S4 is further comprising the steps of,
S43 calculates the touching of testing capacitance formula according to the time point of voltage amplitude variation in the first voltage Wave data
Touch the position of the induction electrode path middle impedance change point of screen functional sheet；
S44 judges the induction electrode path of testing capacitance formula touch screen function piece according to the first voltage Wave data
Middle impedance change point is open circuit or short circuit.
Further, judge the induction electrode path middle impedance change point of testing capacitance formula touch screen function piece for open circuit or it is short
The formula on road is,
Wherein, ρ is reflection coefficient, as ρ=- 1, the induction electrode path middle impedance of testing capacitance formula touch screen function piece
Change point is short circuit, and when ρ=1, the induction electrode path middle impedance change point of testing capacitance formula touch screen function piece is open circuit；
VrFor the voltage amplitude at the time point of voltage amplitude variation in the first voltage Wave data；ViSwash to be described
Encourage the voltage amplitude of step signal；ZLFor the load impedance of testing capacitance formula touch screen function piece；Z0For testing capacitance formula touch screen
The line characteristic impedance of functional sheet.
Based on a kind of above-mentioned method for detecting capacitive touch screen functional sheet, the present invention also provides a kind of detection capacitive touch
The system for touching screen functional sheet.
A kind of system detecting capacitive touch screen functional sheet, including vision inspection apparatus, numerical control motion platform, probe mould
Group, test device and host computer,
The vision inspection apparatus is used to detect the position of testing capacitance formula touch screen function piece, obtains location information；
The probe mould group is mounted on the numerical control motion platform, and the numerical control motion platform is used for according to the position
Information controls the probe mould group and contacts with testing capacitance formula touch screen function piece；
The test device is electrically connected with the probe mould group, and the test device by the probe mould group for being treated
It surveys capacitive touch screen functional sheet and applies an excitation step signal, and obtain the excitation step signal and touched in testing capacitance formula
Shield reflected first voltage Wave data when transmitting in the induction electrode path of functional sheet；
The host computer is used to judge that testing capacitance formula touch screen function piece is by the first voltage Wave data
No is non-defective unit, and in the case where testing capacitance formula touch screen function piece is not non-defective unit, is calculated by the first waveform data
The open circuit point or short dot in the induction electrode path of testing capacitance formula touch screen function piece out.
The beneficial effects of the present invention are: a kind of system for detecting capacitive touch screen functional sheet of the present invention passes through vision-based detection
Device detects capacitive touch screen functional sheet to be measured position, and numerical control motion platform drives according to the location information of detection and visits
Needle mould group is contacted with testing capacitance formula touch screen function piece, and test device passes through probe mould group to testing capacitance formula touch screen function
Piece applies an excitation step signal, and obtains the excitation step signal in the induction electrode of testing capacitance formula touch screen function piece
Reflected voltage waveform data when transmitting in path, host computer judge that testing capacitance formula touches according to voltage waveform data
Shield whether functional sheet is non-defective unit；The present invention can quickly detect capacitive touch screen functional sheet, have on-line checking, continuous to make
The characteristics of industry quickly detects, real-time information transmission, can move to function from the module group assembling stage for electric performance test using this system
The energy piece fabrication stage, to improve production efficiency.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the host computer is specifically used for,
The first voltage Wave data and pre-stored second voltage Wave data are subjected to correlation calculations, obtained
Relevance threshold；
Wherein, the second voltage waveform is induction of the excitation step signal in non-defective unit capacitive touch screen functional sheet
Reflected voltage waveform data when being transmitted in electrode path；
Judge whether testing capacitance formula touch screen function piece is non-defective unit according to the relevance threshold.
Beneficial effect using above-mentioned further scheme is: the present invention passes through the difference of comparison measurement results and standard value,
The quality of this measurement functional sheet is judged, in order to quickly judge using approximate angle value (correlation calculations) determining method.
Further, the host computer carries out the formula of correlation calculations and is,
Wherein, first voltage Wave data and second voltage Wave data are the data sequence of voltage and time, O
In the voltage amplitude of preset time point in two voltage waveform datas,For in second voltage Wave data in overall time section
Voltage amplitude average value, T be first voltage Wave data in preset time point voltage amplitude,For first voltage wave
The average value of voltage amplitude in graphic data in overall time section.
Beneficial effect using above-mentioned further scheme is: in order to quickly calculate, first calculating second voltage Wave data
In the voltage amplitude in overall time section average valueWith the electricity in first voltage Wave data in overall time section
The average value of pressure amplitude degreeAccording to the formula of correlation calculations, two very big sequences of data volume can be thus converted to
A numerical value between one 0~1, which is exactly correlation, and numerical value is bigger, then the product and non-defective unit measured is more similar, by
This can be simple and quick the quality for judging product to be measured.
Further, when testing capacitance formula touch screen function piece be substandard products, the host computer also particularly useful for,
According to the time point of voltage amplitude variation in the first voltage Wave data, testing capacitance formula touch screen is calculated
The position of the induction electrode path middle impedance change point of functional sheet；
Judged to hinder in the induction electrode path of testing capacitance formula touch screen function piece according to the first voltage Wave data
Anti- change point is open circuit or short circuit.
Further, judge the induction electrode path middle impedance change point of testing capacitance formula touch screen function piece for open circuit or it is short
The formula on road is,
Wherein, ρ is reflection coefficient, as ρ=- 1, the induction electrode path middle impedance of testing capacitance formula touch screen function piece
Change point is short circuit, and when ρ=1, the induction electrode path middle impedance change point of testing capacitance formula touch screen function piece is open circuit；
VrFor the voltage amplitude at the time point of voltage amplitude variation in the first voltage Wave data；ViSwash to be described
Encourage the voltage amplitude of step signal；ZLFor the load impedance of testing capacitance formula touch screen function piece；Z0For testing capacitance formula touch screen
The line characteristic impedance of functional sheet.
Detailed description of the invention
Fig. 1 is a kind of flow chart for the method for detecting capacitive touch screen functional sheet of the present invention；
Fig. 2 is a kind of structural block diagram for the system for detecting capacitive touch screen functional sheet of the present invention.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
As shown in Figure 1, a kind of method for detecting capacitive touch screen functional sheet, includes the following steps,
S1 detects the position of testing capacitance formula touch screen function piece, obtains location information；
S2 controls detection device according to the positional information and contacts with testing capacitance formula touch screen function piece；
S3 applies an excitation step signal to capacitive touch screen functional sheet to be measured by the detection device, and obtains
Reflected first when the excitation step signal is transmitted in the induction electrode path of testing capacitance formula touch screen function piece
Voltage waveform data；
S4 judges whether testing capacitance formula touch screen function piece is non-defective unit by the first voltage Wave data, and
In the case where testing capacitance formula touch screen function piece is not non-defective unit, testing capacitance formula is calculated by the first waveform data
The open circuit point or short dot in the induction electrode path of touch screen function piece.
In this embodiment, the S4 specifically,
The first voltage Wave data and pre-stored second voltage Wave data are carried out correlation calculations by S41,
Obtain relevance threshold；
Wherein, the second voltage waveform is induction of the excitation step signal in non-defective unit capacitive touch screen functional sheet
Reflected voltage waveform data when being transmitted in electrode path；
S42 judges whether testing capacitance formula touch screen function piece is non-defective unit according to the relevance threshold.
The present invention passes through the difference of comparison measurement results and standard value, to judge the quality of this measurement functional sheet, in order to
Quickly judgement is using approximate angle value (correlation calculations) determining method.
The formula of progress correlation calculations is in the S41,
Wherein, first voltage Wave data and second voltage Wave data are the data sequence of voltage and time, O
In the voltage amplitude of preset time point in two voltage waveform datas,For in second voltage Wave data in overall time section
Voltage amplitude average value, T be first voltage Wave data in preset time point voltage amplitude,For first voltage wave
The average value of voltage amplitude in graphic data in overall time section.
In order to quickly calculate, the flat of the voltage amplitude in overall time section in second voltage Wave data is first calculated
Mean valueWith the average value of the voltage amplitude in first voltage Wave data in overall time sectionAccording to correlation calculations
Two very big sequences of data volume thus can be converted to a numerical value between one 0~1 by formula, which is exactly
Correlation, numerical value is bigger, then the product and non-defective unit measured is more similar, it is possible thereby to which simple and quick judges the good of product to be measured
It is bad.
When testing capacitance formula touch screen function piece is substandard products, the S4 is further comprising the steps of,
S43 calculates the touching of testing capacitance formula according to the time point of voltage amplitude variation in the first voltage Wave data
Touch the position of the induction electrode path middle impedance change point of screen functional sheet；
S44 judges the induction electrode path of testing capacitance formula touch screen function piece according to the first voltage Wave data
Middle impedance change point is open circuit or short circuit.
Judge the induction electrode path middle impedance change point of testing capacitance formula touch screen function piece for open circuit or the public affairs of short circuit
Formula is,
Wherein, ρ is reflection coefficient, as ρ=- 1, the induction electrode path middle impedance of testing capacitance formula touch screen function piece
Change point is short circuit, and when ρ=1, the induction electrode path middle impedance change point of testing capacitance formula touch screen function piece is open circuit；
VrFor the voltage amplitude at the time point of voltage amplitude variation in the first voltage Wave data；ViSwash to be described
Encourage the voltage amplitude of step signal；ZLFor the load impedance of testing capacitance formula touch screen function piece；Z0For testing capacitance formula touch screen
The line characteristic impedance of functional sheet.
A kind of method for detecting capacitive touch screen functional sheet of the present invention passes through to capacitive touch screen functional sheet to be measured position
It sets and is detected, drive probe mould group to contact with testing capacitance formula touch screen function piece according to the location information of detection, test dress
It sets and capacitive touch screen functional sheet to be measured is tested to obtain test data by probe mould group, host computer is according to test data
Judge whether testing capacitance formula touch screen function piece is non-defective unit；The present invention can quickly detect capacitive touch screen function
The characteristics of piece has on-line checking, works continuously, and quickly detects, real-time information transmission, can be surveyed electrical property using this system
Examination moves to the functional sheet fabrication stage from the module group assembling stage, to improve production efficiency.
Based on a kind of above-mentioned method for detecting capacitive touch screen functional sheet, the present invention also provides a kind of detection capacitive touch
The system for touching screen functional sheet.
As shown in Fig. 2, a kind of system for detecting capacitive touch screen functional sheet, including vision inspection apparatus, numerical control campaign
Platform, probe mould group, test device and host computer,
The vision inspection apparatus is used to detect the position of testing capacitance formula touch screen function piece, obtains location information；
The probe mould group is mounted on the numerical control motion platform, and the numerical control motion platform is used for according to the position
Information controls the probe mould group and contacts with testing capacitance formula touch screen function piece；
The test device is electrically connected with the probe mould group, and the test device by the probe mould group for being treated
It surveys capacitive touch screen functional sheet and applies an excitation step signal, and obtain the excitation step signal and touched in testing capacitance formula
Shield reflected first voltage Wave data when transmitting in the induction electrode path of functional sheet；
The host computer is used to judge that testing capacitance formula touch screen function piece is by the first voltage Wave data
No is non-defective unit, and in the case where testing capacitance formula touch screen function piece is not non-defective unit, is calculated by the first waveform data
The open circuit point or short dot in the induction electrode path of testing capacitance formula touch screen function piece out.
In this embodiment:
The host computer is specifically used for,
The first voltage Wave data and pre-stored second voltage Wave data are subjected to correlation calculations, obtained
Relevance threshold；
Wherein, the second voltage waveform is induction of the excitation step signal in non-defective unit capacitive touch screen functional sheet
Reflected voltage waveform data when being transmitted in electrode path；
Judge whether testing capacitance formula touch screen function piece is non-defective unit according to the relevance threshold.
The formula that the host computer carries out correlation calculations is,
Wherein, first voltage Wave data and second voltage Wave data are the data sequence of voltage and time, O
In the voltage amplitude of preset time point in two voltage waveform datas,For in second voltage Wave data in overall time section
Voltage amplitude average value, T be first voltage Wave data in preset time point voltage amplitude,For first voltage wave
The average value of voltage amplitude in graphic data in overall time section.
When testing capacitance formula touch screen function piece be substandard products, the host computer also particularly useful for,
According to the time point of voltage amplitude variation in the first voltage Wave data, testing capacitance formula touch screen is calculated
The position of the induction electrode path middle impedance change point of functional sheet；
Judged to hinder in the induction electrode path of testing capacitance formula touch screen function piece according to the first voltage Wave data
Anti- change point is open circuit or short circuit.
Judge the induction electrode path middle impedance change point of testing capacitance formula touch screen function piece for open circuit or the public affairs of short circuit
Formula is,
Wherein, ρ is reflection coefficient, as ρ=- 1, the induction electrode path middle impedance of testing capacitance formula touch screen function piece
Change point is short circuit, and when ρ=1, the induction electrode path middle impedance change point of testing capacitance formula touch screen function piece is open circuit；
VrFor the voltage amplitude at the time point of voltage amplitude variation in the first voltage Wave data；ViSwash to be described
Encourage the voltage amplitude of step signal；ZLFor the load impedance of testing capacitance formula touch screen function piece；Z0For testing capacitance formula touch screen
The line characteristic impedance of functional sheet.
In this embodiment:
Communication module is configured in the host computer, the communication module is by Ethernet interface or RS485 interface and outside
The communication of portion's equipment.It is completed rear host computer driving numerical control motion platform and vision inspection apparatus is acted accordingly, with inspection
Survey next testing capacitance formula touch screen function piece；And test result is transferred to external equipment by communication module.
In a kind of system for detecting capacitive touch screen functional sheet of the present invention, testing capacitance is identified by vision inspection apparatus
The position of formula touch screen function piece, obtains location information；After moving platform position is calibrated according to location information, and drive probe mould
Group is contacted with testing capacitance formula touch screen function piece, is tested by test device to obtain test data, host computer is according to survey
Examination data judge whether testing capacitance formula touch screen function piece is non-defective unit, and judging result is exported via communication module to outside
Equipment, such as external equipment can be producing line information management system.
In this embodiment:
The vision inspection apparatus includes industrial camera, vision controller and power supply, and the vision controller passes through line
Road is connected with the industrial camera, and the power supply is electrically connected with the industrial camera and vision controller respectively and is described
Industrial camera and vision controller power supply, the industrial camera and vision controller respectively by route with it is described upper
Machine is connected.The vision inspection apparatus further include for providing the light source of single red light for the industrial camera, it is described
Power supply also connect with the light source and is the light source power supply.
Mainly there are three functions for vision inspection apparatus: a. acquires testing capacitance formula touch screen function piece in the test preparation stage
Loci information, for give the R shaft assembly of numerical control motion platform carry out position compensation；B. electricity to be measured is acquired in test phase
The lower probe location point information of appearance formula touch screen function piece, for controlling the X-axis component and Y-axis component of numerical control motion platform
Position；C. carry out image comparison, for check etching or burn to be formed lead pattern.
In this embodiment:
The numerical control motion platform is specially four axes motion control platform, including X-axis component, Y-axis component, Z axis component, R
Shaft assembly, servo motor, voice coil motor, stepper motor, driving plate and motion control card；The servo motor respectively with the X
Shaft assembly is connected with Y-axis Component driver, and the voice coil motor is connect with the Z axis Component driver, the stepper motor and the R
Shaft assembly is drivingly connected；The servo motor, voice coil motor and stepper motor are connected by route with the driving plate respectively,
The driving plate is connected by route with the motion control card, and the motion control card passes through route and the host computer phase
Even.Top is equipped with article carrying platform on the Z axis component, and the article carrying platform is equipped with vacuum absorption device.On the Z axis component
It is equipped with self-locking device.
The major function of numerical control motion platform is as follows: a. provides the platform for placing testing capacitance formula touch screen function piece, and
Product is fixed on article carrying platform using vacuum absorption device, in order to avoid be displaced when test；B. according to vision inspection apparatus
The information of feedback carries out R shaft assembly position correction；C. the information fed back by host computer according to vision inspection apparatus controls X-axis group
Part and Y-axis component drive Z axis component to carry out plan-position positioning；D. by PC control Z axis component execute probe module with to
The movement that capacitive touch screen functional sheet is contacting and separating is surveyed, and force feedback control is carried out according to the current measurement value of voice coil motor
System.Precision and cost in order to balance, product offending for figure, X, Y-axis is driven using belt, on the contrary then need ball wire
Thick stick transmission；Z axis needs position self-locking device, and all motion parts are respectively mounted position sensor to guarantee to run stroke.
In this embodiment:
The test device includes sampling oscilloscope, domain reflectometer TDR and industrial computer, and the industrial computer is logical
It crosses the domain reflectometer TDR to connect with the sampling oscilloscope, the industrial computer also passes through route and directly adopts with described
Sample oscillograph is connected, and the industrial computer also passes through route and is connected with the host computer.Domain reflectometer TDR is calculated by industry
Machine controls to probe mould group and provides pumping signal, and sampling oscilloscope is sampled by Industrial Computer Control, obtains the excitation step
Signal reflected voltage waveform data when being transmitted in the induction electrode path of testing capacitance formula touch screen function piece, and will
Collected voltage waveform data is transferred to host computer by industrial computer.
Wherein, when probe mould group and testing capacitance formula touch screen function piece contact, test device via with probe mould group pair
Testing capacitance formula touch screen function piece applies an excitation step signal, when the excitation step signal is along testing capacitance formula touch screen function
When the induction electrode path transmission of energy piece, when impedance variations occur in transmission path, a part of signal can be reflected, another portion
Sub-signal will continue to along transmission path；After having signal to be reflected back, sampling oscilloscope can obtain voltage waveform
Data (voltage waveform data that is to say the voltage oscillogram as unit of the time).
In this embodiment:
The probe mould group includes the probe to match with the finger position (hot pressing end) of testing capacitance formula touch screen function piece
Unit and probe actuation plate, the probe unit be equipped with it is multiple, multiple probe units respectively with the probe actuation plate
Connection；The probe unit is made of multiple probes, and the probe includes syringe needle and the needle guard with connecting wire, the syringe needle
It is sleeved in the needle guard, the connecting wire on the needle guard is connected on the probe actuation plate；The probe actuation plate tool
Body is one group of variable connector array, and a plurality of connecting wire in each described probe unit is connected to the probe actuation plate pair
On the way switch answered.Probe mould group is directly connected to testing capacitance formula touch screen function piece, is provided and is touched from testing capacitance formula
Shield functional sheet to the test access between test device.Syringe needle is that semicircle syringe needle touches in order to avoid scratching testing capacitance formula in test
Shield functional sheet.Probe actuation plate is one group of variable connector array, is used to self-test device in timesharing future (specially in test device
Domain reflectometer TDR) excitation step signal distribute in order to testing capacitance formula touch screen function piece each test
Unit.Full wafer opens greatly the probe actuation plate that testing capacitance formula touch screen function built-in testing needs to configure corresponding array,
Small pieces testing capacitance formula touch screen function built-in testing only needs single probe actuation plate.
A kind of system for detecting capacitive touch screen functional sheet of the present invention is by vision inspection apparatus to capacitive touch to be measured
It touches screen functional sheet position to be detected, numerical control motion platform drives probe mould group and testing capacitance formula according to the location information of detection
The contact of touch screen function piece, test device apply an excitation step letter to testing capacitance formula touch screen function piece by probe mould group
Number, and obtain when the excitation step signal is transmitted in the induction electrode path of testing capacitance formula touch screen function piece and be reflected back
The voltage waveform data come, host computer judge whether testing capacitance formula touch screen function piece is good according to voltage waveform data
Product；The present invention can quickly detect capacitive touch screen functional sheet, have on-line checking, work continuously, and quickly detect, in real time
The characteristics of information is transmitted, can move to the functional sheet fabrication stage from the module group assembling stage for electric performance test using this system, from
And improve production efficiency.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method for detecting capacitive touch screen functional sheet, it is characterised in that: include the following steps,
S1 detects the position of testing capacitance formula touch screen function piece, obtains location information；
S2 controls detection device according to the positional information and contacts with testing capacitance formula touch screen function piece；
S3 applies an excitation step signal to capacitive touch screen functional sheet to be measured by the detection device, and described in acquisition
Excitation step signal reflected first voltage when being transmitted in the induction electrode path of testing capacitance formula touch screen function piece
Wave data；
S4 judges whether testing capacitance formula touch screen function piece is non-defective unit by the first voltage Wave data, and to
In the case that survey capacitive touch screen functional sheet is not non-defective unit, testing capacitance formula is calculated by the first waveform data and is touched
Shield the open circuit point or short dot in the induction electrode path of functional sheet.
2. a kind of method for detecting capacitive touch screen functional sheet according to claim 1, it is characterised in that: the S4 tool
Body is,
The first voltage Wave data and pre-stored second voltage Wave data are carried out correlation calculations, obtained by S41
Relevance threshold；
Wherein, the second voltage waveform is induction electrode of the excitation step signal in non-defective unit capacitive touch screen functional sheet
Reflected voltage waveform data when being transmitted in path；
S42 judges whether testing capacitance formula touch screen function piece is non-defective unit according to the relevance threshold.
3. a kind of method for detecting capacitive touch screen functional sheet according to claim 2, it is characterised in that: the S41
It is middle carry out correlation calculations formula be,
Wherein, first voltage Wave data and second voltage Wave data are the data sequence of voltage and time, and O is the second electricity
In the voltage amplitude of preset time point in corrugating data,For the voltage in second voltage Wave data in overall time section
The average value of amplitude, T are the voltage amplitude in first voltage Wave data in preset time point,For first voltage Wave data
In voltage amplitude in overall time section average value.
4. a kind of method for detecting capacitive touch screen functional sheet according to claim 3, it is characterised in that: when electricity to be measured
Appearance formula touch screen function piece is substandard products, and the S4 is further comprising the steps of,
S43 calculates testing capacitance formula touch screen according to the time point of voltage amplitude variation in the first voltage Wave data
The position of the induction electrode path middle impedance change point of functional sheet；
S44 judges to hinder in the induction electrode path of testing capacitance formula touch screen function piece according to the first voltage Wave data
Anti- change point is open circuit or short circuit.
5. a kind of method for detecting capacitive touch screen functional sheet according to claim 4, it is characterised in that: judge to be measured
The induction electrode path middle impedance change point of capacitive touch screen functional sheet is open circuit or short-circuit formula is,
Wherein, ρ is reflection coefficient, and as ρ=- 1, the induction electrode path middle impedance of testing capacitance formula touch screen function piece changes
Point is short circuit, and when ρ=1, the induction electrode path middle impedance change point of testing capacitance formula touch screen function piece is open circuit；
VrFor the voltage amplitude at the time point of voltage amplitude variation in the first voltage Wave data；ViFor the excitation rank
The voltage amplitude of jump signal；ZLFor the load impedance of testing capacitance formula touch screen function piece；Z0For testing capacitance formula touch screen function
The line characteristic impedance of piece.
6. a kind of system for detecting capacitive touch screen functional sheet, it is characterised in that: flat including vision inspection apparatus, numerical control campaign
Platform, probe mould group, test device and host computer,
The vision inspection apparatus is used to detect the position of testing capacitance formula touch screen function piece, obtains location information；
The probe mould group is mounted on the numerical control motion platform, and the numerical control motion platform is for according to the positional information
The probe mould group is controlled to contact with testing capacitance formula touch screen function piece；
The test device is electrically connected with the probe mould group, and the test device is used for through the probe mould group to electricity to be measured
Appearance formula touch screen function piece applies an excitation step signal, and obtains the excitation step signal in testing capacitance formula touch screen function
Reflected first voltage Wave data when being transmitted in the induction electrode path of energy piece；
The host computer be used for by the first voltage Wave data judge testing capacitance formula touch screen function piece whether be
Non-defective unit, and in the case where testing capacitance formula touch screen function piece is not non-defective unit, by the first waveform data calculate to
Survey the open circuit point or short dot in the induction electrode path of capacitive touch screen functional sheet.
7. a kind of system for detecting capacitive touch screen functional sheet according to claim 6, it is characterised in that: described upper
Machine is specifically used for,
The first voltage Wave data and pre-stored second voltage Wave data are subjected to correlation calculations, obtain correlation
Property threshold value；
Wherein, the second voltage waveform is induction electrode of the excitation step signal in non-defective unit capacitive touch screen functional sheet
Reflected voltage waveform data when being transmitted in path；
Judge whether testing capacitance formula touch screen function piece is non-defective unit according to the relevance threshold.
8. a kind of system for detecting capacitive touch screen functional sheet according to claim 7, it is characterised in that: described upper
Machine carry out correlation calculations formula be,
Wherein, first voltage Wave data and second voltage Wave data are the data sequence of voltage and time, and O is the second electricity
In the voltage amplitude of preset time point in corrugating data,For the voltage in second voltage Wave data in overall time section
The average value of amplitude, T are the voltage amplitude in first voltage Wave data in preset time point,For first voltage Wave data
In voltage amplitude in overall time section average value.
9. a kind of system for detecting capacitive touch screen functional sheet according to claim 8, it is characterised in that: when electricity to be measured
Appearance formula touch screen function piece is substandard products, and the host computer is also used to,
According to the time point of voltage amplitude variation in the first voltage Wave data, testing capacitance formula touch screen function is calculated
The position of the induction electrode path middle impedance change point of piece；
Judge that the induction electrode path middle impedance of testing capacitance formula touch screen function piece becomes according to the first voltage Wave data
Change point as open circuit or short circuit.
10. it is according to claim 9 it is a kind of detect capacitive touch screen functional sheet system, it is characterised in that: judge to
The induction electrode path middle impedance change point for surveying capacitive touch screen functional sheet is open circuit or short-circuit formula is,
Wherein, ρ is reflection coefficient, and as ρ=- 1, the induction electrode path middle impedance of testing capacitance formula touch screen function piece changes
Point is short circuit, and when ρ=1, the induction electrode path middle impedance change point of testing capacitance formula touch screen function piece is open circuit；
VrFor the voltage amplitude at the time point of voltage amplitude variation in the first voltage Wave data；ViFor the excitation rank
The voltage amplitude of jump signal；ZLFor the load impedance of testing capacitance formula touch screen function piece；Z0For testing capacitance formula touch screen function
The line characteristic impedance of piece.
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