CN105158615B - Touch screen induction device test circuit - Google Patents
Touch screen induction device test circuit Download PDFInfo
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- CN105158615B CN105158615B CN201510631868.6A CN201510631868A CN105158615B CN 105158615 B CN105158615 B CN 105158615B CN 201510631868 A CN201510631868 A CN 201510631868A CN 105158615 B CN105158615 B CN 105158615B
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Abstract
A kind of touch screen induction device test circuit, access DC voltage and reference voltage, including first interface, second interface, stacked switch, voltage comparison module and indicating module, odd number silver paste lead, even number silver paste lead on touch screen induction device are connected to the stacked switch by the first interface, second interface respectively, and the stacked switch is connected with the DC voltage, reference voltage and voltage comparison module；The stacked switch applies the DC voltage or reference voltage by the first interface and second interface and is detected to the touch screen induction device, output detection voltage is compared to the voltage comparison module afterwards, and whether the indicating module instruction of silver paste migration occurs according to the comparative result of voltage comparison module presentation silver paste circuit.Electrical condition is tested in silver ion migration situation that can accurately on test touch screen inductor between adjacent circuit, adjustment, and flexibility is strong, and wiring only needs two leads, has the advantages such as simple operability height.
Description
Technical field
The present invention relates to Power Electronic Technique, more particularly to a kind of touch screen induction device test circuit.
Background technology
Conducting wire, the common used material of conducting wire are all carried on the inductor of resistive touch screen and capacitive touch screen
Mainly have：Transparent ITO (indium tin oxide), silver paste, molybdenum, aluminium molybdenum etc..And silver paste is since its cost is low, good conductivity and base
Material adhesive force is high, easily graphical processing, stability are also high, is usually used in edge lead on the inductor of touch-screen.But
During using silver paste circuit, due to silver paste inherent characteristic, silver paste circuit easily produces the phenomenon of silver ion migration after being powered, applying
During occur silver ion migration after cause line short so that product failure.
Currently in order to the stability of test silver paste circuit, can all carry out reliability test, including height after touch-screen is carried out
Warm high humidity, thermal shock, salt spray test etc..Since silver ion migration is occurred in "on" position.So during test
Energization is needed to be tested.The test of inductor at present is all that silver paste migration is tested after semifinished or finished goods are fabricated to, due to
In the operating condition, voltage and sequential cannot fully meet silver paste and migrate required electrical condition for semi-finished product and finished product, so
The accuracy of money migration test is not high, and the result of experiment does not possess too big reference significance yet.
The content of the invention
Present invention aims at provide a kind of touch screen induction device test circuit, it is intended to solves the accurate of money migration test
Property is not high, and the result of experiment does not possess the problem of too big reference significance yet.
The present invention provides a kind of touch screen induction device test circuit, accesses DC voltage and reference voltage, including first
Interface, second interface, stacked switch, voltage comparison module and indicating module, the first interface, second interface will be touched respectively
Touch odd number silver paste lead, even number silver paste lead on screen inductor and be connected to the stacked switch, the stacked switch with it is described straight
Galvanic electricity pressure, reference voltage and voltage comparison module connection；
The stacked switch applies the DC voltage or reference voltage to institute by the first interface and second interface
State and detected on touch screen induction device, rear output detection voltage is compared to the voltage comparison module, the indicating module
The instruction of silver paste migration whether occurs according to the comparative result of voltage comparison module presentation silver paste circuit.
Preferably, further include and the voltage stabilizing that the boosting adjustable module of adjustable dc voltage is connected with the boosting adjustable module is provided
Filter module, the regulating filtering module export the DC voltage.
Preferably, the boosting adjustable module includes boost chip, the first capacitance, the first inductance, the first diode, first
Divider resistance and the second divider resistance, second divider resistance are adjustable resistance, wherein：
The power pins of the boost chip connect input power and are connect by first capacity earth, first inductance
Between the power pins of the boost chip and power switch output pin, the anode of first diode connects the boosting
The power switch output pin of chip, cathode connect the input terminal of the regulating filtering module, the first divider resistance one end and
The overvoltage input pin of the boost chip, the feedback pin of another termination boost chip of first divider resistance
And it is grounded by second divider resistance.
Preferably, voltage of the reference voltage for the input power after first capacitive bypass decoupling.
Preferably, the regulating filtering module includes the second inductance and the second capacitance, a termination institute of second inductance
State the cathode of the first diode and the DC voltage is exported by second capacity earth, the other end, and be linked into described
Stacked switch.
Preferably, the stacked switch includes voltage applying unit, voltage output unit, phase inverter, reference resistance and cuts
Switch is changed, the switching switch is connected with the voltage applying unit, and the switching switch passes through the phase inverter and the electricity
Output unit connection is pressed, the voltage applying unit connects the output terminal of the voltage output unit by the reference resistance
Ground；
The voltage applying unit is used to access the DC voltage, and the DC voltage is linked into the touch-screen
On inductor；The voltage output unit is used to access the reference voltage, is accessed the reference voltage by switching switch
The output detection voltage after on to the touch screen induction device.
Preferably, the voltage applying unit includes the second diode, first switch pipe and the 3rd switching tube, the voltage
Output unit includes the 3rd diode, second switch pipe and the 4th switching tube, wherein：
The anode of second diode connects the DC voltage, and cathode connects the input terminal of the first switch pipe, described
The anode of 3rd diode connects the reference voltage, and cathode connects the input terminal of the second switch pipe, the first switch pipe
It is connected after the connection of the output terminal of output terminal and the second switch pipe with odd number silver paste lead on the touch screen induction device, it is described
The input terminal of the input terminal of 3rd switching tube and the 4th switching tube connection after with even number silver paste on the touch screen induction device
Lead connects, and connects after the control terminal connection of the control terminal of the first switch pipe and the 3rd switching tube with the switching switch
Connect, opened after the control terminal of the second switch pipe and the control terminal connection of the 4th switching tube by the phase inverter and the switching
Connection connects, the output head grounding of the second switch pipe, and the output terminal of the 4th switching tube is used to export the detection voltage,
And it is grounded by the reference resistance.
Preferably, the reference resistance is adjustable resistance.
Preferably, the voltage comparison module includes operational amplifier, comparison amplifier, follows resistance and the 3rd capacitance,
Wherein：
The normal phase input end of the operational amplifier connects the detection voltage, and the inverting input of the operational amplifier leads to
Cross the output terminal for following resistance to connect the operational amplifier, the output terminal of the operational amplifier and the comparison amplifier
Normal phase input end connection, and pass through the 3rd capacity earth, the anti-phase input of the comparison amplifier terminates the reference
Voltage, the output of the comparison amplifier terminate the indicating module.
Preferably, the indicating module includes buzzer and/or light emitting diode.
Above-mentioned touch screen induction device test circuit can accurately on test touch screen inductor between adjacent circuit silver
Ion transfer situation, can adjust the electrical condition of test, have flexibility, and wiring only needs two leads or interface, have letter
The advantages such as single operability height.
Brief description of the drawings
Fig. 1 is the module diagram of touch screen induction device test circuit in present pre-ferred embodiments；
Fig. 2 is the circuit diagram of touch screen induction device test circuit in present pre-ferred embodiments.
Embodiment
In order to which technical problems, technical solutions and advantageous effects to be solved by the present invention are more clearly understood, below in conjunction with
Accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein only to
Explain the present invention, be not intended to limit the present invention.
Please refer to Fig.1 and Fig. 2, touch screen induction device test circuit in present pre-ferred embodiments, access DC voltage VPP
With reference voltage VREF.Touch screen induction device test circuit includes first interface 101, second interface 102, stacked switch 103, electricity
Press comparison module 104 and indicating module 105, first interface 101, second interface 102 respectively that touch screen induction device is (not shown
Go out) on odd number silver paste lead 11, even number silver paste lead 12 be connected to stacked switch 103, stacked switch 103 and DC voltage VPP,
Reference voltage VREF and voltage comparison module 104 connect, and voltage comparison module 104 accesses reference voltage VREF.
Stacked switch 103 applies DC voltage VPP or reference voltage VREF by first interface 101 and second interface 102
Detected on to touch screen induction device, rear output detection voltage Vx is compared to voltage comparison module 104, indicating module 105
The instruction whether silver paste circuit occur silver paste migration is presented according to the comparative result of voltage comparison module 104, such as sound and/or is referred to
Show lamp.
Touch screen induction device test circuit test silver paste migration short-circuit conditions, first interface 101 is given by stacked switch 103
The odd number silver paste lead 11 and even number silver paste lead 12 plus DC voltage connected between second interface 102 is tested, and is tested
When the resistance value (test voltage) between odd number silver paste lead 11 and even number silver paste lead 12 is cut by stacked switch 103 at any time
Change to voltage comparator and be compared test, observation experiment situation and result.
Touch screen induction device test circuit further includes the boosting adjustable module 106 for providing adjustable dc voltage and the boosting can
The regulating filtering module 107 that mode transfer block 106 connects, regulating filtering module 107 export DC voltage VPP.
The adjustable module 106 that boosts includes boost chip IC1, the first capacitance C1, the first inductance L1, the first diode D1, the
One divider resistance R1 and the second divider resistance VR1, the second divider resistance VR1 is adjustable resistance.
The power pins 6 of boost chip IC1 meet input power VIN and are grounded by the first capacitance C1, and the first inductance L1 connects
Between the power pins 6 of boost chip IC1 and power switch output pin 1, the anode of the first diode D1 connects boost chip
The power switch output pin 1 of IC1, the cathode of the first diode D1 connect the input terminal of regulating filtering module 107, the first partial pressure electricity
Hinder one end of R1 and the overvoltage input pin 5 of boost chip IC1, another termination boost chip of the first divider resistance R1
The feedback pin 3 of IC1 is simultaneously grounded by the second divider resistance VR1.It is defeated to adjust the second divider resistance VR1 boosting adjustable modules 106
Go out adjustable DC voltage, voltage is adjustable in 3.3V-30V.
Regulating filtering module 107 includes the one or two pole of termination of the second inductance L2 and the second capacitance C2, the second inductance L2
The cathode of pipe D1 is simultaneously grounded by the second capacitance C2, other end output DC voltage VPP, and is linked into stacked switch 103.
Reference voltage VREF is voltages of the input power VIN after the first capacitance C1 bypass decouplings.In other embodiments,
External DC voltage VPP and reference voltage VREF can be used.
Stacked switch 103 includes voltage applying unit 1031, voltage output unit 1032, phase inverter 1033, reference resistance
VR2 and switching switch 1034, switching switch 1034 are connected with voltage applying unit 1031, and switching switch 1034 passes through phase inverter
1033 are connected with voltage output unit 1032, voltage applying unit 1031 by the output terminal of voltage output unit 1032 by reference to
Resistance VR2 is grounded.
Voltage applying unit 1031 is used to access DC voltage VPP, and DC voltage VPP is linked into touch screen induction device
On；Voltage output unit 1032 is used to access reference voltage VREF, is linked into reference voltage VREF by switching switch 1034
Output detection voltage Vx after on touch screen induction device.
Voltage applying unit 1031 includes the second diode D2, first switch pipe T1 and the 3rd switch transistor T 3, voltage output
Unit 1032 includes the 3rd diode D3, second switch pipe T2 and the 4th switch transistor T 4.Reference resistance VR2 is adjustable resistance.
The anode of second diode D2 meets DC voltage VPP, and cathode connects the input terminal of first switch pipe T1, the 3rd diode
The anode of D3 meets reference voltage VREF, and cathode connects the input terminal of second switch pipe T2, the output terminal and second of first switch pipe T1
It is connected after the output terminal connection of switch transistor T 2 with odd number silver paste lead 11 on touch screen induction device, the input terminal of the 3rd switch transistor T 3
It is connected after being connected with the input terminal of the 4th switch transistor T 4 with even number silver paste lead 12 on touch screen induction device, first switch pipe T1's
Control terminal is grounded after being connected with the control terminal of the 3rd switch transistor T 3 by switching switch 1034, the control terminal of second switch pipe T2 and
It is grounded after being connected after the control terminal connection of 4th switch transistor T 4 by phase inverter 1033 with switching switch 1034, second switch pipe T2
Output head grounding, the output terminal of the 4th switch transistor T 4 is used to export detection voltage Vx, and is grounded by reference to resistance VR2.Cut
It is by the K1 that compresses switch to change switch 1034.
Phase inverter 1033 includes the 5th switch transistor T 5, the first pull-up resistor R2 and current-limiting resistance R3, the 5th switch transistor T 5
Control terminal is grounded for the input terminal of phase inverter 1033 by switching switch 1034, and the control terminal of the 5th switch transistor T 5 passes through first
Pull-up resistor R2 connects reference voltage VREF, the control terminal and the 4th switch of the input termination second switch pipe T2 of the 5th switch transistor T 5
The control terminal of pipe T4, also connects reference voltage VREF, the output head grounding of the 5th switch transistor T 5 by current-limiting resistance R3.
In the present embodiment, first switch pipe T1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4 the 5th are opened
It is n type field effect transistor to close pipe T5.The input, output end of switching tube, control terminal be respectively field-effect transistor source electrode,
Drain electrode, grid.In other embodiments, switching tube can use metal-oxide-semiconductor or triode to replace.
Voltage comparison module 104 includes operational amplifier IC2, comparison amplifier IC3, follows resistance R4, the 3rd partial pressure electricity
Hinder R5, the 4th divider resistance R6, the 3rd capacitance C3 and the 4th capacitance C4.
The normal phase input end of operational amplifier IC2 meets detection voltage Vx, the inverting input of operational amplifier IC2 by with
The output terminal of operational amplifier IC2 is connect with resistance R4, the positive of the output terminal and comparison amplifier IC3 of operational amplifier IC2 is defeated
Enter end connection, and be grounded by the 3rd capacitance C3, the inverting input of comparison amplifier IC3 connects ginseng by the 3rd divider resistance R5
Voltage VREF is examined, is grounded by the 4th divider resistance R6, and is grounded by the 4th capacitance C4, the output terminal of comparison amplifier IC3
Connect indicating module 105.
Indicating module 105 includes buzzer and/or light emitting diode D4.
The circuit operation principle of touch screen induction device test circuit：
Boost chip IC1 refers to model MP1518, and the 6PIN of boost chip IC1 connects input power VIN, 2PIN ground connection, the
One capacitance C1 stablizes input voltage for the bypass decoupling capacitance of boost chip IC1.First inductance L1 is connected on boost chip IC1's
Between 6PIN and 1PIN, for storage energy of boosting.First diode D1 is used for voltage commutation.Second capacitance C2 can for boosting
The output filtering of mode transfer block 106.The 3PIN of boost chip IC1 is accessed after first divider resistance R1 and the second divider resistance VR1 partial pressures
For boost feedback, the size of output voltage can be adjusted by the adjustment of the second divider resistance VR1.Boost chip IC1's
5PIN is used for overvoltage protection.The 4PIN of boost chip IC1 enables foot for IC, and it is IC normal operating conditions to connect high level.Boost core
The 1PIN of piece IC1, which can export square-wave signal, makes the first inductance L1 be charged and discharged to produce high pressure, whole by the first diode D1
Stream, exports steady dc voltage VPP after the low-pass filter circuit of the second capacitance C2 and the second inductance L2 compositions is connected.Input
Voltage VREF as the reference voltage after the first capacitance C1 filtering.
DC voltage VPP and reference voltage VREF connects crystal after the second diode D2 and the 3rd diode D3 respectively
The source electrode of pipe first switch pipe T1 and second switch pipe T2, the effect of the second diode D2 and the 3rd diode D3 are to prevent voltage
Pour in down a chimney.The drain electrode of first switch pipe T1 and second switch pipe T2 link together, and are connected to the odd number silver of touch panel sensor
Starch on lead 11.The source electrode of 3rd switch transistor T 3 and the 4th switch transistor T 4 connects, and is connected to the idol of touch panel sensor
On number silver paste lead 12.3rd switch transistor T, 3 grounded drain, the drain electrode of the 4th switch transistor T 4 meet adjustable reference resistance VR2.The
The grid of one switch transistor T 1 and the 3rd switch transistor T 3 links together, the grid connection of second switch pipe T2 and the 4th switch transistor T 4
Together.5th switch transistor T 5, the first pull-up resistor R2 and current-limiting resistance R3 form a phase inverter, and input terminal connection first is opened
Close the grid of pipe T1 and the grid of the 3rd switch transistor T 3, output terminal connection second switch pipe T2 and the 4th switch transistor T 4.5th opens
The grid for closing pipe T5 connects one by the K1 that compresses switch, by the K1 other ends ground connection that compresses switch.When not pressed by the K1 that compresses switch, due to R2
The effect of pull-up, the grid of the 5th switch transistor T 5 is high level, therefore the first switch pipe T1 being attached thereto and the 3rd switch transistor T 3
Grid be also high level, make first switch pipe T1, the 3rd switch transistor T 3,5 source electrode of the 5th switch transistor T and drain electrode conducting, first
The conducting of 1 and the 3rd switch transistor T 3 of switch transistor T, makes DC voltage vpp voltage through the second diode D2 and first switch pipe T1, warp
Cross the ag paste electrode of experiment product, and through the 3rd switch transistor T 3 to ground, make odd number silver paste lead 11 and even number silver paste lead 12 it
Between the voltage close to DC voltage VPP.On the other hand, the 5th switch transistor T 5 turns on, and makes the source electrode of the 5th switch transistor T 5 defeated
Go out low level, 4 transistor cutoff of second switch pipe T2 and the 4th switch transistor T.When being pressed by the K1 that compresses switch, the 5th switch transistor T 5
Grid be low level, it is also low level to make first switch pipe T1 and the grid of the 3rd switch transistor T 3, first switch pipe T1 and
Three switch transistor Ts 3 are ended.5th switch transistor T 5 is not turned on, and the source electrode of the 5th switch transistor T 5 pulls up output high level by R3, makes second
2 and the 4th switch transistor T 4 of switch transistor T turns on.Silver paste circuit (odd number silver paste lead 11 and even number silver paste lead) is set to be added to reference
Voltage VREF to the 3rd diode D3, second switch pipe T2, the 4th switch transistor T 4, reference resistance VR2 circuit in.So make silver
Slurry lead is equivalent to reference resistance VR2 and constitutes a bleeder circuit, and reference resistance VR2 can carry out micro- according to actual conditions
Adjust.
Filtered capacitance C6 voltage regulation filterings after reference resistance VR2 partial pressures, are linked into the positive input of operational amplifier IC2
It is operational amplifier to hold 3PIN, operational amplifier IC2, the inverting input 2PIN and output terminal 6PIN of operational amplifier IC2 it
Between by one follow resistance R4 to be connected, form a voltage follower, make output terminal 6PIN voltages of operational amplifier IC2 etc.
In the normal phase input end 3PIN voltages of operational amplifier IC2.Voltage is after the 3rd capacitance C3 voltage stabilizings with comparison amplifier IC3's
Normal phase input end 3PIN is connected, and comparison amplifier IC3 is comparison amplifier.Reference voltage VREF is steady by R5 and R6 partial pressures and C4
The inverting input 2PIN of comparison amplifier IC3 is accessed after pressure, if the inverting input 2PIN voltages of comparison amplifier IC3 are high
In the normal phase input end 3PIN voltages of comparison amplifier IC3, the output terminal 6PIN of comparison amplifier IC3 exports high level, if
The inverting input 2PIN voltages of comparison amplifier IC3 are less than or equal to the normal phase input end 3PIN of comparison amplifier IC3, compare
The output terminal 6PIN output low levels of amplifier IC3.The output terminal 6PIN connection electric capacity of voltage regulation C5 of comparison amplifier IC3, and even
Current-limiting resistance R7 is met, current-limiting resistance R7 connecting luminous diode D4, light emitting diode D4 can be substituted with buzzer, for indicating
Experimental status and result.
If silver paste migration does not occur for experiment product, the resistance resistance between odd number silver paste lead 11 and even number silver paste lead 12
Value Rx can be larger, and in more than 1M, the resistance value of the second divider resistance VR1 is smaller, and such as 100K, access operational amplifier IC2 is just
Voltage about Vx=VR1/ (VR1+Rx) * VREF of phase input terminal 3PIN, due to Rx>>VR1, the positive of such operational amplifier IC2
Close to 0V, the normal phase input end 3PIN voltages to comparison amplifier IC3 after voltage follower also connect input terminal 3PIN voltages
Nearly 0V, makes the normal phase input end 3PIN voltages of comparison amplifier IC3 to be less than the inverting input 2PIN electricity of comparison amplifier IC3
Pressure, so that the output terminal 6PIN of comparison amplifier IC3, exports low level, D4 light emitting diodes do not shine.
If silver paste migration, the resistance between odd number silver paste lead 11 and even number silver paste lead 12 occur for experiment product
Rx can diminish, within 100K, the voltage about Vx=VR1/ (VR1+ of the normal phase input end 3PIN of access operational amplifier IC2
Rx the normal phase input end 3PIN voltages of) * VREF, such operational amplifier IC2 close to 0.5* reference voltage VREF, through overvoltage with
With after device arrive comparison amplifier IC3 normal phase input end 3PIN voltages also close to 0.5* reference voltage VREF, comparison amplifier IC3
Inverting input 2PIN voltages pass through R5 and R6 partial pressure, be arranged to 0.2*REF, input the positive of comparison amplifier IC3
The inverting input 2PIN voltages for holding 3PIN voltages to be more than comparison amplifier IC3, so that the output terminal of comparison amplifier IC3
6PIN, exports high level, D4 lumination of light emitting diode.
Above-mentioned touch screen induction device test circuit can accurately on test touch screen inductor between adjacent circuit silver
Ion transfer situation, can adjust the electrical condition of test, have flexibility, and wiring only needs two leads or interface, have letter
The advantages such as single operability height.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of touch screen induction device test circuit, accesses DC voltage and reference voltage, it is characterised in that connect including first
Mouth, second interface, stacked switch, voltage comparison module and indicating module, the first interface, second interface will touch respectively
Odd number silver paste lead, even number silver paste lead are connected to the stacked switch, the stacked switch and the direct current on screen inductor
Voltage, reference voltage and voltage comparison module connection；
The stacked switch applies the DC voltage or reference voltage by the first interface and second interface and is touched to described
Touch and detected on screen inductor, rear output detection voltage is compared to the voltage comparison module, the indicating module according to
The instruction whether silver paste circuit occurs silver paste migration is presented in the comparative result of the voltage comparison module.
2. touch screen induction device test circuit as claimed in claim 1, it is characterised in that offer adjustable dc voltage is be provided
The regulating filtering module that is connected with the boosting adjustable module of boosting adjustable module, the regulating filtering module exports the direct current
Voltage.
3. touch screen induction device test circuit as claimed in claim 2, it is characterised in that the boosting adjustable module includes rising
Press chip, the first capacitance, the first inductance, the first diode, the first divider resistance and the second divider resistance, the second partial pressure electricity
Hinder for adjustable resistance, wherein：
The power pins of the boost chip connect input power and are connected on institute by first capacity earth, first inductance
State between the power pins of boost chip and power switch output pin, the anode of first diode connects the boost chip
Power switch output pin, cathode connects the input terminal of the regulating filtering module, one end of the first divider resistance and described
The overvoltage input pin of boost chip, the feedback pin of another termination boost chip of first divider resistance are simultaneously led to
Cross the second divider resistance ground connection.
4. touch screen induction device test circuit as claimed in claim 3, it is characterised in that the reference voltage is the input
Voltage of the power supply after first capacitive bypass decoupling.
5. touch screen induction device test circuit as claimed in claim 3, it is characterised in that the regulating filtering module includes the
Two inductance and the second capacitance, the cathode of termination first diode of second inductance are simultaneously connect by second capacitance
Ground, the other end exports the DC voltage, and is linked into the stacked switch.
6. such as claim 1 to 5 any one of them touch screen induction device test circuit, it is characterised in that the stacked switch
Including voltage applying unit, voltage output unit, phase inverter, reference resistance and switching switch, the switching switch and the electricity
Applying unit connection is pressed, the switching switch is connected by the phase inverter with the voltage output unit, and the voltage applies
The output terminal of the voltage output unit is grounded by unit by the reference resistance；
The voltage applying unit is used to access the DC voltage, and the DC voltage is linked into the touch screen induction
On device；The voltage output unit is used to access the reference voltage, and the reference voltage is linked into institute by switching switch
The output detection voltage after stating on touch screen induction device.
7. touch screen induction device test circuit as claimed in claim 6, it is characterised in that the voltage applying unit includes the
Two diodes, first switch pipe and the 3rd switching tube, the voltage output unit include the 3rd diode, second switch pipe and the
Four switching tubes, wherein：
The anode of second diode connects the DC voltage, and cathode connects the input terminal of the first switch pipe, and the described 3rd
The anode of diode connects the reference voltage, and cathode connects the input terminal of the second switch pipe, the output of the first switch pipe
It is connected after the connection of the output terminal of end and the second switch pipe with odd number silver paste lead on the touch screen induction device, the described 3rd
The input terminal of the input terminal of switching tube and the 4th switching tube connection after with even number silver paste lead on the touch screen induction device
It is connected after the control terminal connection of connection, the control terminal of the first switch pipe and the 3rd switching tube with the switching switch,
Pass through the phase inverter and the switching switch after the control terminal of the second switch pipe and the control terminal connection of the 4th switching tube
Connection, the output head grounding of the second switch pipe, the output terminal of the 4th switching tube are used to export the detection voltage, and
It is grounded by the reference resistance.
8. touch screen induction device test circuit as claimed in claim 6, it is characterised in that the reference resistance is adjustable electric
Resistance.
9. such as claim 1 to 5 any one of them touch screen induction device test circuit, it is characterised in that the voltage compares
Module includes operational amplifier, comparison amplifier, follows resistance and the 3rd capacitance, wherein：
The normal phase input end of the operational amplifier connects the detection voltage, and the inverting input of the operational amplifier passes through institute
The output terminal for following resistance to connect the operational amplifier is stated, the output terminal and the comparison amplifier of the operational amplifier are just
Phase input terminal connects, and terminates the reference voltage by the 3rd capacity earth, the anti-phase input of the comparison amplifier,
The output of the comparison amplifier terminates the indicating module.
10. touch screen induction device test circuit as claimed in claim 9, it is characterised in that the indicating module includes buzzing
Device and/or light emitting diode.
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| CN201510631868.6A CN105158615B (en) | 2015-09-29 | 2015-09-29 | Touch screen induction device test circuit |
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| CN106847141A (en) * | 2016-12-29 | 2017-06-13 | 深圳市宇顺电子股份有限公司 | A kind of display screen test circuit |
| CN111625146B (en) * | 2020-05-27 | 2023-08-04 | 北京无线电测量研究所 | Electronic product with double touch screens |
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| CN105158615A (en) | 2015-12-16 |
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