CN106526398B - The detection method and detection device of capacitive touch screen - Google Patents
The detection method and detection device of capacitive touch screen Download PDFInfo
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- CN106526398B CN106526398B CN201610960424.1A CN201610960424A CN106526398B CN 106526398 B CN106526398 B CN 106526398B CN 201610960424 A CN201610960424 A CN 201610960424A CN 106526398 B CN106526398 B CN 106526398B
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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 detection method of capacitive touch screen, touch screen includes multiple capacitive nodes, comprising steps of setting detection time point according to the time constant design value of the circuit of touch screen；Input voltage is provided to touch screen, and starts timing；The output voltage of the capacitive node of point detection touch screen between when detecting；Judge whether the output voltage of at least one capacitive node beyond preset voltage range, if so, touch screen is bad, if it is not, then touch screen is good.The present invention also provides a kind of detection devices of capacitive touch screen, comprising: detection time point setting module, output voltage detection module and judgment module.The above method and device, are able to detect that the circuit not really open circuit of touch screen, but there is a situation where that empty disconnected or void is short, and detection effect is good, and failure screen body is effectively avoided to come into the market.
Description
Technical field
The present invention relates to the detection technique field of touch screen, in particular to the detection method and inspection of a kind of capacitive touch screen
Survey device.
Background technique
Currently, touch screen is widely used to the consumer electronics fields such as mobile phone, plate, multilayer ITO or list are generally used
Layer ITO bridging mode, forms X, the crosspoint of Y direction, these crosspoints are the capacitive nodes for forming capacitance matrix.Work as finger
When touching screen, the capacitance variations by detecting touch points determine touch operation situation.
In the production process of touch screen, due to actual circuit problem, it is bad to will cause the insensitive touch screen of touch
Phenomenon.Therefore, touch screen factory before, generally can for screen body be likely to occur it is bad detected, avoid failure screen body stream
Enter market.Traditional detection method is: specific pulse voltage signal is sent at the driving end of touch screen, in one section of long enough
It is interior that the voltage of the induction end of touch screen is made to reach stable voltage Vr, by VrWith standard voltage value V0Compare, according to comparison result
Judge whether touch screen is bad.
The detection method of this traditional touch screen can only decision circuitry open circuit (Vr> V0) caused by touch screen it is bad.It is real
On border, the void of circuit is short and empty break also results in that touch screen is bad, and traditional detection method of touch screen can not decision circuitry
Empty short or empty disconnected caused touch screen is bad, and detection effect is undesirable.
Summary of the invention
Based on this, it is necessary to for the undesirable problem of the detection method detection effect of above-mentioned traditional touch screen, provide
A kind of detection method and detection device of capacitive touch screen.
A kind of detection method of capacitive touch screen, the touch screen include multiple capacitive nodes, comprising steps of
Detection time point is set according to the time constant design value of the circuit of the touch screen；
Input voltage is provided to the touch screen, and starts timing；
Point detects the output voltage of the capacitive node between in the detection；
Judge whether the output voltage of at least one capacitive node beyond preset voltage range, if so, institute
It is bad to state touch screen, if it is not, then the touch screen is good.
When the time constant design value of the circuit according to the touch screen sets detection in one of the embodiments,
Between put the step of include:
The output voltage curve of the capacitive node, institute are determined according to the time constant design value of the circuit of the touch screen
Stating output voltage curve includes ascent stage and steady section；
Any point in the ascent stage is set as the detection time point.
When the time constant design value of the circuit according to the touch screen sets detection in one of the embodiments,
Between the step of putting are as follows: set the time constant design value as the detection time point.
When the time constant design value of the circuit according to the touch screen sets detection in one of the embodiments,
Between put the step of before, further comprise the steps of:
The port numbers of the port numbers of the driving port of the touch screen and the sensor port of the touch screen are set；
It is pulse voltage that the input voltage, which is arranged,.
It is described in one of the embodiments, to provide input voltage to the touch screen, and before the step of starting timing,
It further comprises the steps of:
The time constant range of the circuit is determined according to the time constant design value, wherein the time of the circuit is normal
Number range includes the time constant design value；
The preset voltage range is calculated according to the time constant range and the pulse voltage.
In one of the embodiments, it is described in the detection between point detect the capacitive node output voltage step
It suddenly include: that port is driven described in sequential scan, the sense of the capacitive node each of under each driving port of detection
The output voltage of port is answered, and stores the output voltage.
The output voltage for judging whether at least one capacitive node is beyond pre- in one of the embodiments,
If voltage range, if so, the touch screen is bad, if it is not, then the good step of the touch screen includes:
Judge whether the output voltage exceeds the preset voltage range, if so, determining the capacitive node not
It is good, and the port numbers of the driving port of the undesirable capacitive node and the port numbers of the sensor port are recorded, if it is not,
Then determine that the capacitive node is good；
Judge whether that all driving port scans finish, if scanned, terminates to scan and judge the touch
Whether screen is good, if not scanned, continues to drive port described in sequential scan.
A kind of detection device of capacitive touch screen, the touch screen include multiple capacitive nodes, comprising:
Detection time point setting module, when for setting detection according to the time constant design value of the circuit of the touch screen
Between point；
Voltage input module for providing input voltage to the touch screen, and starts timing；
Output voltage detection module detects the output voltage of the capacitive node for point between in the detection；
Judgment module, for judging whether the output voltage of at least one capacitive node beyond preset voltage model
It encloses, if so, the touch screen is bad, if it is not, then the touch screen is good.
The detection device of the capacitive touch screen in one of the embodiments, further include:
Port setup module, for the port numbers of the driving port of the touch screen and the induction end of the touch screen to be arranged
The port numbers of mouth；
Driving voltage setup module is pulse voltage for the input voltage to be arranged；
Voltage range setup module, for determining the time constant model of the circuit according to the time constant design value
It encloses, wherein the time constant range includes the time constant design value, and according to the time constant range and the arteries and veins
It rushes voltage and calculates the preset voltage range.
The output voltage detection module is also used to drive port described in sequential scan in one of the embodiments, inspection
Survey it is each it is described driving port under each of the sensor port of the capacitive node the output voltage, and store described in
Output voltage；
The judgment module is also used to judge whether the output voltage exceeds the preset voltage range, if so,
Determine that the capacitive node is bad, and records the end of the driving port and the sensor port of the undesirable capacitive node
Slogan, if it is not, then determining that the capacitive node is good；The judgment module is also used to judge whether that all driving ports are swept
It retouches and finishes, if scanned, terminate to scan and judge whether the touch screen is good, if not scanned, continuation sequence
Scan the driving port.
The detection method and detection device of above-mentioned capacitive touch screen are designed according to the time constant of the circuit of touch screen
Value presets the detection time point of detection touch screen.In the output electricity of the capacitive node of detection time point detection touch screen
Pressure illustrates that the time constant actual value of touch screen deviates time constant design if output voltage exceeds preset voltage range
It is worth excessive, the void for causing circuit is disconnected or empty short, so that it is insensitive to cause touch screen to touch.Therefore, the detection method and detection
Device is able to detect that the circuit not really open circuit of touch screen, but there is a situation where that empty disconnected or void is short, and detection effect is good,
Failure screen body is effectively avoided to come into the market.
Detailed description of the invention
Fig. 1 is the circuit diagram of the capacitive touch screen of one embodiment of the invention；
Fig. 2 is the flow diagram of the detection method of the capacitive touch screen of embodiment illustrated in fig. 1；
Fig. 3 is the input voltage schematic diagram of circuit shown in Fig. 1；
Fig. 4 is the corresponding output voltage schematic diagram of input voltage shown in Fig. 3；
Fig. 5 is the flow diagram of the detection method of the capacitive touch screen of another embodiment of the present invention；
Fig. 6 is the structural schematic diagram of the detection device of the capacitive touch screen of one embodiment of the invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
Capacitive touch screen includes multiple capacitive nodes, these capacitive nodes constitute capacitance matrix.It should be noted that
Before detecting touch screen with the detection method of following embodiment, need to initialize touch screen.I.e. according to capacitive node
Line number and columns setting touch screen driving port quantity and sensor port quantity, drive port quantity be equal to capacitor
The line number of node, the capacitive node in the every a line of capacitance matrix are connected with same driving port.The quantity of sensor port is equal to electricity
Hold the columns of node, the capacitive node on each column of capacitance matrix is connected with same sensor port.If a driving port
Upper plus input voltage Vt(i.e. driving voltage), then under the driving port sensor port of corresponding each capacitive node just have it is defeated
Voltage V outr(i.e. induced voltage).If providing input voltage V to touch screent, then all driving ports can all add the input
Voltage Vt。
Fig. 1 is please referred to, is the circuit diagram of the capacitive touch screen of an embodiment.As shown in Figure 1, in the present embodiment,
The circuit of touch screen is integrating circuit, the output voltage V of circuitrCalculation formula are as follows:
Vr=Vt[1-exp(-t/τ)] (1)
Wherein, VtFor input voltage, VrFor output voltage, τ is the time constant value of the circuit, and τ=RC, R are resistance value, C
For capacitance.
By the characteristic of integrating circuit it is found that the input terminal in the integrating circuit adds input voltage Vt, the integrating circuit it is defeated
Outlet exports corresponding output voltage Vr, and output voltage VrIt changes over time.
Referring to figure 2., Fig. 2 is the flow diagram of the detection method of the capacitive touch screen of embodiment illustrated in fig. 1.Such as figure
Shown in 2, a kind of detection method of capacitive touch screen, including step S130, it is designed according to the time constant of the circuit of touch screen
Value setting detection time point.
Specifically, in general, before producing touch screen, engineer can design the time constant value τ of circuit0(τ0=
R0C0, wherein R0For resistive arrangement value, C0For capacitor design value), τ0As time constant design value.Produce touch screen Shi Zaixuan
With matched resistance and capacitor.Therefore, when detecting touch screen, engineer can be first according to the time constant of the integrating circuit
Design value τ0, the detection time point t of pre-set detection touch screend.In detection time point tdIt is able to detect capacitance touch screen
It is whether good.Detection time point tdIt may be greater than time constant design value τ0Time point, be also possible to set less than time constant
Evaluation τ0Time point, can also be time constant design value τ0The time point at place.In the real work for detecting touch screen, root
Select suitable time point as detection time point t according to the convenience of detectiond。
Step S160 provides input voltage to touch screen, and starts timing.
Specifically, to touch screen plus input voltage while, timing starts.In the input voltage V of touch screentUnder, at this
Detection time point tdWhether good detect the touch screen.
Step S170, when detecting between point detection capacitive node output voltage.
Specifically, when detecting between point tdDetect the output voltage V of the corresponding sensor port of capacitive noder, with defeated by this
The value of voltage judges whether capacitive node is good out.
Step S180 judges whether that the output voltage of at least one capacitive node exceeds preset voltage range, if so,
Touch screen is bad, if it is not, then touch screen is good.
Referring to figure 3. and Fig. 4, Fig. 3 be Fig. 1 shown in circuit input voltage VtSchematic diagram, Fig. 4 are input shown in Fig. 3
Voltage VtCorresponding output voltage VrSchematic diagram.In the present embodiment, input voltage VtAs shown in figure 3, input voltage VtFor pulse electricity
Pressure.Assuming that the time constant actual value τ ' (τ '=R ' C ', wherein R ' is resistance actual value, and C ' is capacitor actual value) of touch screen
Equal to time constant design value τ0, input voltage V shown in Fig. 3tUnder, the output voltage curve of the circuit of touch screen is (as schemed
Shown in 4) be desired output voltage curve, i.e., when detecting between point td, output voltage VrValue be desired output voltage value.And it touches
The time constant actual value τ ' for touching screen may deviate time constant design value τ0, therefore as given input voltage Vt, in the detection
Time point td, actual output voltage value can also deviate desired output voltage value.Therefore, in detection time point td, engineer understands root
According to time constant design value τ0With input voltage VtThe output voltage range of preinstalled circuit.If point t between when detectingdIt measures
The actual output voltage value of capacitive node then proves that the capacitive node is good in preset voltage range.If when detecting
Between point tdThe actual output voltage value of the capacitive node measured exceeds preset voltage range, then proves that the capacitive node is bad.
In detection time point tdAll capacitive nodes are detected, if it is bad to detect the presence of a capacitive node, determine the touch
Shield bad.Further, if in detection time point td, detect the output voltage values V of capacitive noderGreater than preset electricity
The upper limit value for pressing range, then illustrate that the circuit void of the capacitive node is short.If detecting the output voltage values V of capacitive noderIt is small
In the lower limit value of preset voltage range, then illustrate that the circuit void of the capacitive node is disconnected.No matter empty disconnected or empty short, all proving should
The time constant actual value τ ' of touch screen deviates time constant design value τ0It is excessive, to prove that the capacitive node is bad, therefore
The touch screen is bad.If the actual output voltage value of all capacitive nodes is in preset voltage range, the touch screen
Well.
The detection method of above-mentioned capacitive touch screen presets detection touching according to the time constant design value of the circuit
Touch the detection time point of screen.In the output voltage of the capacitive node of detection time point detection touch screen, if output voltage exceeds
Preset voltage range then illustrates that the time constant actual value deviation time constant design value of touch screen is excessive, causes circuit
Void it is disconnected or empty short, so that it is insensitive to cause touch screen to touch.Therefore, which is able to detect that the circuit of touch screen simultaneously
Not really open circuit, but there is a situation where that empty disconnected or void is short, detection effect is good, and failure screen body is effectively avoided to flow to client.
The step of detection time point is set according to the time constant design value of the circuit of touch screen in one of the embodiments,
Suddenly, i.e. step S130 includes:
The output voltage curve of capacitive node is determined according to the time constant design value of the circuit of touch screen, output voltage is bent
Line includes ascent stage and steady section；
Any point in the ascent stage is set as detection time point.
Specifically, since the circuit of touch screen is integrating circuit, if the specific input voltage of the circuit for giving touch screen,
It can then determine that the desired output voltage curve of capacitive node, the waveform of output voltage curve can join according to time constant design value
According to Fig. 4.Output voltage changes over time, and within a period of time of beginning, output voltage is increased over time, later, output voltage
It is gradually steady, therefore output voltage curve includes ascent stage and steady section.No matter the actual value of the time constant of touch screen is more
Greatly, when output voltage curve reaches steady section, the value of output voltage is all close to determining value (for the value of input voltage).Therefore,
Will test time point was set in the ascent stage, in the detection time point, detects the value of output voltage, can just detect touch screen
Circuit is short or empty disconnected with the presence or absence of void, to can just detect whether touch screen is bad, and testing result is accurate.
Referring to figure 5., Fig. 5 is the flow diagram of the detection method of the capacitive touch screen of another embodiment of the present invention.
In the present embodiment, step S130, step S160, step S170 and step S180 can refer to embodiment shown in Fig. 2.
As shown in figure 5, setting detection time point according to the time constant design value of the circuit of touch screen in the present embodiment
Step, i.e. step S130 are as follows: setting time constant design value is detection time point.
Specifically, detection time point t is setdFor time constant design value τ0, i.e. td=τ0=R0C0.Input voltage VtWith it is defeated
Voltage V outrCurve can refer to Fig. 3 and Fig. 4 respectively, by formula (1) it is found that if the circuit of given touch screen is with specific defeated
Enter voltage Vt, in detection time point td, the output voltage V of the circuitrStandard value should be 0.632Vt.In the detection time
Point td, the output voltage V of actually detected induction endrIf VrGreater than 0.632Vt, illustrate from 0 to tdTime in output voltage increase
Big excessive velocities, circuit void is short, and time constant actual value is less than normal compared with time constant design value.In the detection time point
tdIf detecting VrLess than 0.632Vt, illustrate from 0 to tdTime in the speed that increases of output voltage it is excessively slow, circuit void is disconnected,
Time constant actual value is bigger than normal compared with time constant design value.In this way, comparing detection time point tdThe output voltage V at placerReality
Actual value and standard value can be convenient the empty short or empty disconnected situation of ground decision circuitry, and the detection of touch screen is accurate.
In the present embodiment, according to the time constant design value τ of the circuit of touch screen0Set detection time point tdThe step of it
Before, i.e. further include step S110 before step S130, the port numbers of the driving port of touch screen and the induction end of touch screen are set
The port numbers of mouth.Specifically, in the preparation of detection touch screen, first according to the quantity and sense of the driving port of touch screen
Answer the quantity of port that the port numbers of driving port and the port numbers of sensor port are set in order respectively.For subsequent driving port
It is ready with the sequential scan of sensor port.
Step S120, setting input voltage are pulse voltage.Specifically, it in the preparation of detection touch screen, also needs
The input voltage of driving port is set, and input voltage waveform can refer to Fig. 3, and in the present embodiment, input voltage is pulse voltage.
Further, the waveform of pulse voltage is square wave, and pulse voltage has preset frequency and amplitude.
In this way, setting driving port and sensor port and input voltage, it is ready for detection touch screen, improves inspection
Survey efficiency.
In the present embodiment, touch screen is being given to provide input voltage, and before the step of starting timing, i.e. step S160 it
Before, further include step S140, the time constant range of circuit is determined according to time constant design value, wherein the time constant of circuit
Range includes time constant design value.Specifically, it has been observed that time constant design value is τ0, set the circuit of touch screen when
Between constant actual value τ ' range are as follows: n τ0< τ ' < m τ0(m > n, and m, n are positive number, m > 1, n < 1), the reality of time constant
Value τ ' is empty short or empty disconnected beyond the circuit that the range is touch screen.Further, τ ' >=m τ0When for circuit void it is disconnected, τ '≤n τ0
When for circuit void it is short.
Step S150 calculates preset voltage range according to time constant range and pulse voltage.Specifically, in touch screen
It is actually detected during, detection device is not easy the actual value τ ' of direct detection time constant, therefore can be by indirect
Whether method judges the actual value τ ' of time constant within the scope of the time constant of setting.In the present embodiment, give to drive port
Pulse voltage, it is assumed that the amplitude of pulse voltage is Vt, then sense can be calculated according to time constant range and formula (1)
Answer the output voltage V of portrPreset voltage range.Therefore, according to formula (1), time constant range and driving port
Pulse voltage amplitude, point t between being calculated when detectingdCorresponding voltage range, therefore, preset voltage range are as follows:
Vt[1-exp(-td/mτ0)] < Vr< Vt[1-exp(-td/nτ0)] (2)
(2) formula is simplified, preset voltage range are as follows:
Vt[1-exp (- 1/m)] < Vr< Vt[1-exp(-1/n)] (3)
Further, work as Vr≥Vt[1-exp (- 1/n)], it was demonstrated that circuit void is short, i.e. τ '≤n τ0, the actual value of time constant
τ ' deviates time constant design value τ0It is too small；Work as Vr≤Vt[1-exp (- 1/m)], it was demonstrated that circuit void is disconnected, τ ' >=m τ0, time constant
Actual value τ ' deviate time constant design value τ0It is excessive.
In this way, by detecting whether output voltage exceeds the method for preset voltage range come the time constant of decision circuitry
Whether actual value exceeds time constant range, detects easy to be intuitive.
It should be noted that in the design process of actual touch screen, when being arranged according to the actual demand to touch screen
Between constant range.That is, the value of m and n in above-mentioned time constant range are the actual demand settings according to touch screen
's.
In the present embodiment, when detecting between point detection capacitive node output voltage the step of, i.e., step S170 includes: suitable
Sequence turntable driving port, detects the output voltage of the sensor port of each capacitive node under each driving port, and stores defeated
Voltage out.
Specifically, foundation drives the sequence of the port numbers of port, successively turntable driving port.By the electricity of touch screen above-mentioned
Holding matrix it is found that each driving port corresponds to a line capacitive node, this line capacitive node is located at the different lines of capacitance matrix, this
The capacitive node of a little different lines corresponds to different sensor ports.When scanning to a driving port, it is corresponding to detect the driving port
All capacitive nodes sensor port output voltage Vr, and by the output voltage V of these capacitive nodesrIt stores to touch screen
Controller.The each driving port of sequential scan, it is ensured that the integrality of capacitive node detection, it is not easy to omit, detection is complete
Face.Also, by the output voltage V of each capacitive noderIt stores to controller, can be convenient whether controller compares output voltage
In preset voltage range, staff can also transfer output voltage data at any time, preferably to design touch screen.It needs
, it is noted that the corresponding output voltage V of capacitive noderFor analog quantity, need output voltage VrIt is converted via analog-to-digital conversion module
It is stored again for digital quantity, compares output voltage V to facilitaterWhether in preset voltage range.
In the present embodiment, judge whether the output voltage of at least one capacitive node beyond preset electricity in step S180
Press range, if so, touch screen is bad, if it is not, then touch screen it is good in, further include step S181, whether judge output voltage
Beyond preset voltage range, if so, determining that capacitive node is bad, and the end of the driving port of undesirable capacitive node is recorded
The port numbers of slogan and sensor port, if it is not, then determining that capacitive node is good.
Specifically, the output voltage V of capacitive node has been detectedrLater, compare the output voltage V of the capacitive noderWith it is default
Voltage range, if the output voltage V of the capacitive noderBeyond preset voltage range, then the capacitive node is bad.Record
The port numbers of the driving port of the capacitive node and the port numbers of sensor port, according to capacitance matrix above-mentioned, it can be learnt that should
The specific location of capacitive node repairs the capacitive node with facilitating.If the output voltage V of the capacitive noderDo not surpass
Preset voltage range out, then the capacitive node is good.
Step S182 judges whether that all driving port scans finish, if scanned, terminate to scan and judge to touch
Whether screen is good, if not scanned, continues sequential scan driving port.
Specifically, when all capacitive nodes under scanning to a driving port, the following sequential scan driving port
Corresponding sensor port, and the output voltage according to sensor port judges whether corresponding capacitive node is good.The drive is detected
After all capacitive nodes under moved end mouthful, judge whether that all driving port scans finish, i.e., whether is the current driving port of judgement
Port is driven for the last one, if currently driving port is the last one driving port, all driving port scans are finished, tied
Beam scanning, and judge whether touch screen is good according to the quantity of the bad capacitive node of record.Further, if bad capacitor
The quantity of node is greater than or equal to one, then touch screen is bad.If the quantity of bad capacitive node is zero, touch screen is good
It is good.If currently driving port is not the last one driving port, and not all driving port is all scanned, then continuation sequence
Turntable driving port, until all driving port scans finish.
In this way, scanning all driving ports, and detect each sensor port for driving each capacitive node under port
Output voltage Vr, whether each capacitive node that can comprehensively detect touch screen is good, avoids omitting, and detection effect is good,
Failure screen body is effectively avoided to come into the market.It, can also be according to the bad capacitive node of record meanwhile for undesirable touch screen
Specific location is targetedly repaired, and is repaired simplicity, and can be improved the utilization rate of resource, is avoided wasting.
Fig. 6 is please referred to, is the structural schematic diagram of the detection device of the capacitive touch screen of an embodiment.Touch screen includes more
A capacitive node.As shown in fig. 6, a kind of detection device of capacitive touch screen, comprising:
Detection time point setting module 130, when for setting detection according to the time constant design value of the circuit of touch screen
Between point；
Voltage input module 160 for providing input voltage to touch screen, and starts timing；
Output voltage detection module 170, for the output voltage of the capacitive node of point detection touch screen between when detecting, if
The output voltage of at least one capacitive node exceeds preset voltage range, then touch screen is bad；
Judgment module 180, for judging whether the output voltage of at least one capacitive node beyond preset voltage model
It encloses, if so, touch screen is bad, if it is not, then touch screen is good.
The detection device of above-mentioned capacitive touch screen, detection time point setting module 130 is according to the time constant of the circuit
Design value presets the detection time point of detection touch screen.In the detection time point, output voltage detection module 160 is detected
The output voltage of the capacitive node of touch screen illustrates that the time of touch screen is normal if output voltage exceeds preset voltage range
Number actual value deviation time constant design value is excessive, and the void for causing circuit is disconnected or empty short, so that it is ineffective to cause touch screen to touch
It is quick.Therefore, which is able to detect that the circuit not really open circuit of touch screen, but there are empty disconnected or empty short feelings
Condition, detection effect is good, and failure screen body is effectively avoided to flow to client.
The detection device of capacitive touch screen in one of the embodiments, further include:
Port setup module, for the port of the port numbers of the driving port of touch screen and the sensor port of touch screen to be arranged
Number；
Driving voltage setup module is pulse voltage for input voltage to be arranged；
Voltage range setup module, for determining the time constant range of circuit according to time constant design value, wherein when
Between constant range include time constant design value, and preset voltage range is calculated according to time constant range and pulse voltage.
Output voltage detection module is also used to sequential scan driving port in one of the embodiments, detects each drive
The output voltage of the sensor port of each capacitive node under moved end mouthful, and store output voltage；
Judgment module is also used to judge whether output voltage exceeds preset voltage range, if so, determining capacitive node
It is bad, and the port numbers of the driving port and sensor port of undesirable capacitive node are recorded, if it is not, then determining that capacitive node is good
It is good；Judgment module is also used to judge whether that all driving port scans finish, if scanned, terminate to scan and judges to touch
Whether screen is good, if not scanned, continues sequential scan driving port.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of detection method of capacitive touch screen, the touch screen includes multiple capacitive nodes, which is characterized in that including step
It is rapid:
Detection time point is set according to the time constant design value of the circuit of the touch screen；
Input voltage is provided to the touch screen, and starts timing；
Point detects the output voltage of the capacitive node between in the detection；
Judge whether the output voltage of at least one capacitive node beyond preset voltage range, if so, the touching
It is bad to touch screen, if it is not, then the touch screen is good；
Wherein, if the output voltage of the capacitive node is greater than the upper limit value of the preset voltage range, the capacitance section
The circuit void of point is short；If the output voltage of the capacitive node is less than the lower limit value of the preset voltage range, the electricity
The circuit void for holding node is disconnected.
2. the detection method of capacitive touch screen according to claim 1, which is characterized in that described according to the touch screen
Circuit time constant design value set detection time point the step of include:
The output voltage curve of the capacitive node is determined according to the time constant design value of the circuit of the touch screen, it is described defeated
Voltage curve includes ascent stage and steady section out；
Any point in the ascent stage is set as the detection time point.
3. the detection method of capacitive touch screen according to claim 1, which is characterized in that described according to the touch screen
Circuit time constant design value set detection time point the step of are as follows:
The time constant design value is set as the detection time point.
4. the detection method of capacitive touch screen according to claim 1, which is characterized in that described according to the touch screen
Circuit time constant design value set detection time point the step of before, further comprise the steps of:
The port numbers of the port numbers of the driving port of the touch screen and the sensor port of the touch screen are set；
It is pulse voltage that the input voltage, which is arranged,.
5. the detection method of capacitive touch screen according to claim 4, which is characterized in that described to be mentioned to the touch screen
For input voltage, and before the step of starting timing, further comprise the steps of:
The time constant range of the circuit is determined according to the time constant design value, wherein the time constant model of the circuit
It encloses including the time constant design value；
The preset voltage range is calculated according to the time constant range and the pulse voltage.
6. the detection method of capacitive touch screen according to claim 5, which is characterized in that it is described in the detection between
Point detects the step of output voltage of the capacitive node and includes:
Port is driven described in sequential scan, the induction end of the capacitive node each of under each driving port of detection
The output voltage of mouth, and store the output voltage.
7. the detection method of capacitive touch screen according to claim 6, which is characterized in that described to judge whether at least
The output voltage of one capacitive node exceeds preset voltage range, if so, the touch screen is bad, if it is not, then institute
Stating the good step of touch screen includes:
Judge whether the output voltage exceeds the preset voltage range, if so, determine that the capacitive node is bad, and
The port numbers of the driving port of the undesirable capacitive node and the port numbers of the sensor port are recorded, if it is not, then sentencing
The fixed capacitive node is good；
Judge whether that all driving port scans finish, if scanned, terminates to scan and judge that the touch screen is
It is no good, if not scanned, continue to drive port described in sequential scan.
8. a kind of detection device of capacitive touch screen, the touch screen includes multiple capacitive nodes characterized by comprising
Detection time point setting module, the time constant design value for the circuit according to the touch screen set detection time
Point；
Voltage input module for providing input voltage to the touch screen, and starts timing；
Output voltage detection module, detects the output voltage of the capacitive node for point between in the detection, judgment module,
For judging whether that the output voltage of at least one capacitive node exceeds preset voltage range, if so, the touch
Shield it is bad, if it is not, then the touch screen is good；
Wherein, if the output voltage of the capacitive node is greater than the upper limit value of the preset voltage range, the capacitance section
The circuit void of point is short；If the output voltage of the capacitive node is less than the lower limit value of the preset voltage range, the electricity
The circuit void for holding node is disconnected.
9. the detection device of capacitive touch screen according to claim 8, which is characterized in that further include:
Port setup module, for the port numbers of the driving port of the touch screen and the sensor port of the touch screen to be arranged
Port numbers；
Driving voltage setup module is pulse voltage for the input voltage to be arranged；
Voltage range setup module, for determining the time constant range of the circuit according to the time constant design value,
In, the time constant range includes the time constant design value, and according to the time constant range and pulse electricity
Pressure calculates the preset voltage range.
10. the detection device of capacitive touch screen according to claim 9, which is characterized in that
The output voltage detection module is also used to drive port described in sequential scan, detects every under each driving port
The output voltage of the sensor port of a capacitive node, and store the output voltage；
The judgment module is also used to judge whether the output voltage exceeds the preset voltage range, if so, determining
The capacitive node is bad, and records the port of the driving port and the sensor port of the undesirable capacitive node
Number, if it is not, then determining that the capacitive node is good；The judgment module is also used to judge whether all driving port scans
It finishes, if scanned, terminates to scan and judge whether the touch screen is good, if not scanned, continuation sequence is swept
Retouch the driving port.
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| CN113721093A (en) * | 2021-08-26 | 2021-11-30 | 昆山国显光电有限公司 | Display panel mother board, detection method and system of display panel mother board |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202083763U (en) * | 2011-05-24 | 2011-12-21 | 宸鸿光电科技股份有限公司 | Electronic device and broken circuit detecting system thereof |
| CN101846712B (en) * | 2010-04-01 | 2012-08-29 | 苏州崴展电子科技有限公司 | ITO (Indium Tin Oxide) electrical characteristic detecting method and detecting system of capacitance type touch screen |
| 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 |
| CN103123549A (en) * | 2012-08-29 | 2013-05-29 | 深圳市汇顶科技股份有限公司 | Touch screen system and synchronous detection method thereof |
| CN103308776A (en) * | 2013-05-08 | 2013-09-18 | 漳州宝发光电科技有限公司 | Testing circuit of capacitive screen and testing method thereof |
| CN104297579A (en) * | 2013-07-15 | 2015-01-21 | 鸿富锦精密工业（深圳）有限公司 | Detection device and method |
| CN105606948A (en) * | 2016-02-01 | 2016-05-25 | 北京集创北方科技股份有限公司 | Circuit detection method and system |
| CN106054013A (en) * | 2016-05-20 | 2016-10-26 | 北京集创北方科技股份有限公司 | Touching device detection method and touching device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102043299B1 (en) * | 2012-12-26 | 2019-11-11 | 엘지디스플레이 주식회사 | Touch Screen With Integrated Display Device And Method for Testing of Touch Panel |
-
2016
- 2016-10-28 CN CN201610960424.1A patent/CN106526398B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846712B (en) * | 2010-04-01 | 2012-08-29 | 苏州崴展电子科技有限公司 | ITO (Indium Tin Oxide) electrical characteristic detecting method and detecting system of capacitance type touch screen |
| CN202083763U (en) * | 2011-05-24 | 2011-12-21 | 宸鸿光电科技股份有限公司 | Electronic device and broken circuit detecting system thereof |
| CN103123549A (en) * | 2012-08-29 | 2013-05-29 | 深圳市汇顶科技股份有限公司 | Touch screen system and synchronous detection method thereof |
| 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 |
| CN103308776A (en) * | 2013-05-08 | 2013-09-18 | 漳州宝发光电科技有限公司 | Testing circuit of capacitive screen and testing method thereof |
| CN104297579A (en) * | 2013-07-15 | 2015-01-21 | 鸿富锦精密工业（深圳）有限公司 | Detection device and method |
| CN105606948A (en) * | 2016-02-01 | 2016-05-25 | 北京集创北方科技股份有限公司 | Circuit detection method and system |
| CN106054013A (en) * | 2016-05-20 | 2016-10-26 | 北京集创北方科技股份有限公司 | Touching device detection method and touching device |
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