CN106526398A - Detection method and device of capacitive touch screen - Google Patents
Detection method and device of capacitive touch screen Download PDFInfo
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- CN106526398A CN106526398A CN201610960424.1A CN201610960424A CN106526398A CN 106526398 A CN106526398 A CN 106526398A CN 201610960424 A CN201610960424 A CN 201610960424A CN 106526398 A CN106526398 A CN 106526398A
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- touch screen
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- output voltage
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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 invention relates to a detection method of a capacitive touch screen. The capacitive touch screen comprises multiple capacitive nodes. The method comprises a step of setting a detection time point according to the time constant design value of the circuit of the touch screen, a step of providing input voltage for the touch screen and starting timing, a step of detecting the output voltage of the capacitance node of the touch screen at a detection time point, a step of judging whether the output voltage of at least one capacitance node exceeds a preset voltage range or not, if so, determining a poor touch screen, and if not, determining a bad screen. The invention also provides a detection device of a capacitive touch screen. The detection device comprises a detection time point setting module, an output voltage detection module and a judgment module. According to the above method and device, a condition that the circuit of the touch screen is not really in open circuit but is in virtual open circuit or virtual short circuit, the detection effect is good, and the flow of a failed screen into the market is effectively avoid.
Description
Technical field
The present invention relates to the detection technique field of touch screen, more particularly to a kind of detection method of capacitive touch screen and inspection
Survey device.
Background technology
At present, touch screen is widely used to the consumer electronics fields such as mobile phone, flat board, and which typically adopts multilamellar ITO or list
Layer ITO bridging modes, form X, the cross point of Y direction, and these cross points are the capacitive nodes for constituting capacitance matrix.Work as finger
During touching screen, touch operation situation is determined by the capacitance variations for detecting touch points.
In the production process of touch screen, due to actual circuit problem, can cause to touch insensitive touch screen bad
Phenomenon.Therefore, before touch screen dispatches from the factory, typically bad can be detected for what screen body was likely to occur, it is to avoid failure screen body stream
Enter market.Traditional detection method is：Specific pulse voltage signal is sent in the drive end of touch screen, in one section of long enough
The voltage of the interior induction end for making touch screen reaches stable voltage Vr, by VrWith standard voltage value V0Relatively, according to comparative 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 empty short and empty disconnected of circuit also results in that touch screen is bad, and traditional detection method of touch screen cannot decision circuitry
It is empty short or it is empty it is disconnected caused by touch screen it is bad, Detection results are undesirable.
The content of the invention
Based on this, it is necessary to for the undesirable problem of the detection method Detection results of above-mentioned traditional touch screen, there is provided
A kind of detection method of capacitive touch screen and detection means.
A kind of detection method of capacitive touch screen, the touch screen includes multiple capacitive nodes, including step:
According to the time constant design load setting detection time point of the circuit of the touch screen；
Input voltage is provided to the touch screen, and starts timing；
The output voltage of the capacitive node is detected in the detection time point；
Judge whether the output voltage of at least one capacitive node beyond default voltage range, if so, then institute
State touch screen bad, if it is not, then the touch screen is good.
Wherein in one embodiment, during the time constant design load setting detection of the circuit according to the touch screen
Between put the step of include：
The output voltage curve of the capacitive node, institute are determined according to the time constant design load 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.
Wherein in one embodiment, during the time constant design load setting detection of the circuit according to the touch screen
Between put the step of be：The time constant design load is set as the detection time point.
Wherein in one embodiment, during the time constant design load setting detection of the circuit according to the touch screen
Between put the step of before, also including step：
The port numbers of the sensor port of the port numbers and the touch screen of the driving port of the touch screen are set；
The input voltage is set for pulse voltage.
It is wherein in one embodiment, described to provide input voltage to the touch screen, and the step of start timing before,
Also include step：
The time constant scope of the circuit is determined according to the time constant design load, the time of wherein described circuit is normal
Number scope includes the time constant design load；
The default voltage range is calculated according to the time constant scope and the pulse voltage.
Wherein in one embodiment, the step of the output voltage for detecting the capacitive node in the detection time point
Suddenly include：Port is driven described in sequential scan, detects the sense of each capacitive node under each described driving port
The output voltage of port is answered, and stores the output voltage.
Wherein in one embodiment, the output voltage for judging whether at least one capacitive node is beyond pre-
If voltage range, if so, then the touch screen is bad, if it is not, then the good step of the touch screen includes：
Judge that the output voltage, whether beyond the default voltage range, if so, then judges the capacitive node not
It is good, and the port numbers and the port numbers of the sensor port of the driving port of the bad capacitive node are recorded, if it is not,
Then judge that the capacitive node is good；
Judge whether that all driving ports are scanned, if scanned, terminate 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 means of capacitive touch screen, the touch screen include multiple capacitive nodes, including：
Detection time point setting module, for the circuit according to the touch screen time constant design load setting detection when
Between point；
Control source module, for providing input voltage to the touch screen, and starts timing；
Output voltage detection module, for detecting the output voltage of the capacitive node in the detection time point；
Judge module, for judging whether that the output voltage of at least one capacitive node exceeds default voltage model
Enclose, if so, the touch screen is bad, if it is not, then the touch screen is good.
Wherein in one embodiment, the detection means of the capacitive touch screen also includes：
Port setup module, for arranging the port numbers and the induction end of the touch screen of the driving port of the touch screen
The port numbers of mouth；
Driving voltage setup module, for arranging the input voltage for pulse voltage；
Voltage range setup module, for determining the time constant model of the circuit according to the time constant design load
Enclose, wherein, the time constant scope includes the time constant design load, and according to the time constant scope and the arteries and veins
Rush voltage and calculate the default voltage range.
Wherein in one embodiment, the output voltage detection module is additionally operable to drive port described in sequential scan, inspection
The output voltage of the sensor port of each capacitive node surveyed under each described driving port, and store described
Output voltage；
The judge module is additionally operable to judge the output voltage whether beyond the default voltage range, if so, then
Judge that the capacitive node is bad, and record the driving port and the end of the sensor port of the bad capacitive node
Slogan, if it is not, then judge that the capacitive node is good；The judge module is additionally operable to judge whether that all driving ports are swept
Retouch and finish, if scanned, terminate to scan and judge whether the touch screen is good, if not scanned, continuation order
Scan the driving port.
The detection method and detection means of above-mentioned capacitive touch screen, according to the time constant design 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 the detection time point detection touch screen
Pressure, if output voltage exceeds default voltage range, illustrates that the time constant actual value of touch screen deviates time constant design
Value is excessive, and the void for causing circuit is disconnected or empty short, insensitive so as to cause touch screen to touch.Therefore, the detection method and detection
Device is able to detect that the inreal open circuit of the circuit of touch screen, but there is empty disconnected or empty short situation, and Detection results are good,
It is prevented effectively from failure screen body to come into the market.
Description of the drawings
Circuit diagrams of the Fig. 1 for the capacitive touch screen of one embodiment of the invention；
Schematic flow sheets of the Fig. 2 for the detection method of the capacitive touch screen of embodiment illustrated in fig. 1；
Input voltage schematic diagrams of the Fig. 3 for circuit shown in Fig. 1；
Fig. 4 is the corresponding output voltage schematic diagram of input voltage shown in Fig. 3；
Schematic flow sheets of the Fig. 5 for the detection method of the capacitive touch screen of another embodiment of the present invention；
Structural representations of the Fig. 6 for the detection means of the capacitive touch screen of one embodiment of the invention.
Specific embodiment
It is understandable for enabling the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
Capacitive touch screen includes multiple capacitive nodes, and these capacitive nodes constitute capacitance matrix.It should be noted that
Before with the detection method detection touch screen of following examples, need to initialize touch screen.I.e. according to capacitive node
Line number and columns arrange touch screen driving port quantity and sensor port quantity, drive port quantity be equal to electric capacity
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 the every string of capacitance matrix is connected with same sensor port.If driving port at one
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
Go out voltage Vr(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 refer 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 be integrating circuit, the output voltage V of circuitrComputing formula be：
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.
From the characteristic of integrating circuit, add input voltage V in the input of the integrating circuitt, the integrating circuit it is defeated
Go out the corresponding output voltage V of end outputr, and output voltage VrChange over.
Refer to Fig. 2, schematic flow sheets of the Fig. 2 for the detection method of the capacitive touch screen of embodiment illustrated in fig. 1.As schemed
Shown in 2, a kind of detection method of capacitive touch screen, including step S130, according to the time constant design of the circuit of touch screen
Value setting detection time point.
Specifically, generally, before production touch screen, engineer can design time constant value τ of circuit0(τ0=
R0C0, wherein, R0For resistive arrangement value, C0For capacitor design value), τ0As time constant design load.Selected during production touch screen again
With the resistance and electric capacity of matching.Therefore, when touch screen is detected, the time constant that engineer can first according to the integrating circuit
Design load τ0, the detection time point t of pre-set detection touch screend.In detection time point tdCapacitance touch screen can be detected
It is whether good.Detection time point tdMay be greater than time constant design load τ0Time point, it is also possible to be less than time constant and set
Evaluation τ0Time point, can also be time constant design load τ0The time point at place.In the real work of detection touch screen, root
According to the suitable time point of convenient Sexual behavior mode of detection as detection time point td。
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 tdDetect whether the touch screen is good.
Step S170, detects the output voltage of capacitive node in detection time point.
Specifically, in detection time point tdThe output voltage V of the corresponding sensor port of detection capacitive noder, with defeated by this
The value for going out voltage judges whether capacitive node is good.
Step S180, judges whether that the output voltage of at least one capacitive node exceeds default voltage range, if so,
Touch screen is bad, if it is not, then touch screen is good.
Refer to the input voltage V of Fig. 3 and Fig. 4, Fig. 3 for circuit shown in Fig. 1tSchematic diagram, Fig. 4 are the 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.Assume the time constant actual value τ ' (τ '=R ' C ', wherein, R ' is resistance actual value, and C ' is electric capacity actual value) of touch screen
Equal to time constant design load τ0, in the 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., in detection time point td, output voltage VrValue be desired output voltage value.And touch
The time constant actual value τ ' for touching screen may deviate time constant design load 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 load τ0With input voltage VtThe output voltage range of preinstalled circuit.If in detection time point tdMeasure
The actual output voltage value of capacitive node then proves that the capacitive node is good in default voltage range.If in detection
Between point tdThe actual output voltage value of the capacitive node for measuring exceeds default voltage range, then prove 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, the touch is judged
Screen is bad.Further, if in detection time point td, detect the output voltage values V of capacitive noderMore than default electricity
The higher limit of pressure scope, then illustrate that the circuit void of the capacitive node is short.If detecting the output voltage values V of capacitive noderIt is little
In the lower limit of default voltage range, then illustrate that the circuit of the capacitive node is empty disconnected.It is no matter empty disconnected or empty short, all prove this
The time constant actual value τ ' of touch screen deviates time constant design load τ0It is excessive, it is bad so as to prove the capacitive node, therefore
The touch screen is bad.If the actual output voltage value of all capacitive nodes is in default voltage range, the touch screen
Well.
The detection method of above-mentioned capacitive touch screen, according to the time constant design load of the circuit, presets detection and touches
Touch the detection time point of screen.In the output voltage of the capacitive node of the detection time point detection touch screen, if output voltage exceeds
Default voltage range, then illustrate that the time constant actual value deviation time constant design load of touch screen is excessive, cause circuit
Void it is disconnected or empty short, it is insensitive so as to cause touch screen to touch.Therefore, the detection method is able to detect that the circuit of touch screen simultaneously
Inreal open circuit, but there is empty disconnected or empty short situation, Detection results are good, are prevented effectively from failure screen body stream to client.
Wherein in one embodiment, the step of detection time point is set according to the time constant design load of the circuit of touch screen
Suddenly, i.e., step S130 includes：
The output voltage curve of capacitive node is determined according to the time constant design load 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, as the circuit of touch screen is integrating circuit, if the specific input voltage of the circuit for giving touch screen,
The desired output voltage curve of capacitive node is just can determine that according to time constant design load then, the waveform of output voltage curve can be joined
According to Fig. 4.Output voltage is changed over, and within a period of time for starting, output voltage is increased over, afterwards, 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 many
Greatly, when output voltage curve reaches steady section, the value of output voltage is all close to the value for determining (for the value of input voltage).Therefore,
Detection time point was set in the ascent stage, in the detection time point, the value of output voltage is detected, can just be detected touch screen
Circuit is short or empty disconnected with the presence or absence of void, and whether bad so as to can just detect touch screen, testing result is accurate.
Refer to Fig. 5, schematic flow sheets of the Fig. 5 for 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 refer to the embodiment shown in Fig. 2.
As shown in figure 5, in the present embodiment, setting detection time point according to the time constant design load of the circuit of touch screen
Step, i.e. step S130 are：Setting time constant design load is detection time point.
Specifically, set detection time point tdFor time constant design load τ0, i.e. td=τ0=R0C0.Input voltage VtWith it is defeated
Go out voltage VrCurve can refer to Fig. 3 and Fig. 4 respectively, from formula (1), 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, VrMore than 0.632Vt, illustrate from 0 to tdTime in output voltage increase
Big excessive velocities, circuit void are short, and time constant actual value is less than normal compared with time constant design load.In the detection time point
tdIf detecting VrLess than 0.632Vt, illustrate from 0 to tdTime in output voltage increase speed it is excessively slow, circuit is empty disconnected,
Time constant actual value is bigger than normal compared with time constant design load.So, compare detection time point tdThe output voltage V at placerReality
Actual value and standard value can easily decision circuitry empty short or empty disconnected situation, the detection of touch screen is accurate.
In the present embodiment, according to time constant design load τ of the circuit of touch screen0Setting detection time point tdThe step of it
Before, i.e., the port numbers and the induction end of touch screen of the driving port of touch screen, before step S130, also including step S110, are set
The port numbers of mouth.Specifically, quantity and the sense in the preparation of detection touch screen, first according to the driving port of touch screen
The quantity of port is answered to distinguish the port numbers that the port numbers and sensor port that drive port are set in order.For follow-up driving port
It is ready with the sequential scan of sensor port.
Step S120, setting input voltage are pulse voltage.Specifically, in the preparation of detection touch screen, also need
The input voltage for 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 default frequency and amplitude.
So, driving port and sensor port and input voltage is set, is that detection touch screen is ready, is improved inspection
Survey efficiency.
In the present embodiment, providing input voltage to touch screen, and the step of start timing before, i.e., step S160 it
Before, also including step S140, the time constant scope of circuit, the wherein time constant of circuit are determined according to time constant design load
Scope includes time constant design load.Specifically, it has been observed that time constant design load is τ0, set touch screen circuit when
Between the scope of constant actual value τ ' be：nτ0＜ τ ' ＜ m τ0(m ＞ n, and m, n are positive number, m ＞ 1, n ＜ 1), the reality of time constant
Value τ ' it is empty short or empty disconnected beyond the circuit of the scope as touch screen.Further, τ ' >=m τ0When for circuit it is empty disconnected, τ '≤n τ0
When for circuit void it is short.
Step S150, calculates default voltage range according to time constant scope and pulse voltage.Specifically, in touch screen
It is actually detected during, testing equipment is not easy the actual value τ ' of direct detection time constant, therefore can be by indirectly
Whether method judges the actual value τ ' of time constant in the range 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 according to time constant scope and formula (1), sense can be calculated
Answer the output voltage V of portrDefault voltage range.Therefore, according to formula (1), time constant scope and driving port
Pulse voltage amplitude, you can calculate in detection time point tdCorresponding voltage range, therefore, default voltage range is：
Vt[1-exp(-td/mτ0)] ＜ Vr＜ Vt[1-exp(-td/nτ0)] (2)
(2) formula is simplified, default voltage range is：
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 load τ0It is too small；Work as Vr≤Vt[1-exp (- 1/m)], it was demonstrated that circuit is empty disconnected, τ ' >=m τ0, time constant
Actual value τ ' deviate time constant design load τ0It is excessive.
So, by detecting whether output voltage exceeds the method for default voltage range come the time constant of decision circuitry
Whether actual value exceeds time constant scope, and detection is easy to be directly perceived.
It should be noted that in the design process of actual touch screen, when arranging according to the actual demand to touch screen
Between constant range.That is, the value of the m and n in above-mentioned time constant scope is arranged according to the actual demand of touch screen
's.
In the present embodiment, the step of detection time point detects the output voltage of capacitive node, i.e., step S170 includes：It is suitable
Sequence turntable driving port, detects that each drives the output voltage of the sensor port of each capacitive node under port, and stores defeated
Go out voltage.
Specifically, foundation drives the order of the port numbers of port, successively turntable driving port.By the electricity of aforesaid touch screen
Hold matrix to understand, each drives port correspondence a line capacitive node, this line capacitive node to be located at the different lines of capacitance matrix, this
The corresponding different sensor port of capacitive node of a little different lines.When scanning a driving port, driving port correspondence is detected
All capacitive nodes sensor port output voltage Vr, and by the output voltage V of these capacitive nodesrStore to touch screen
Controller.Each driving port of sequential scan, it is ensured that the integrity of capacitive node detection, it is not easy to omit, detection is complete
Face.Also, by the output voltage V of each capacitive noderStore to controller, can facilitate whether controller compares output voltage
In default voltage range, staff can also transfer output voltage data at any time, preferably to design touch screen.Need
, it is noted that the corresponding output voltage V of capacitive noderFor analog quantity, need output voltage VrChange via analog-to-digital conversion module
Stored for digital quantity again, compare output voltage V to facilitaterWhether in default voltage range.
In the present embodiment, judge whether that in step S180 the output voltage of at least one capacitive node exceeds default electricity
Pressure scope, if so, then touch screen is bad, if it is not, during then touch screen is good, also including step S181, whether judging output voltage
Beyond default voltage range, if so, then judge that capacitive node is bad, and record the end of the driving port of bad capacitive node
The port numbers of slogan and sensor port, if it is not, then judge that capacitive node is good.
Specifically, the output voltage V of capacitive node has been detectedrAfterwards, compare the output voltage V of the capacitive noderWith it is default
Voltage range, if the output voltage V of the capacitive noderBeyond default voltage range, then the capacitive node is bad.Record
The port numbers and the port numbers of sensor port of the driving port of the capacitive node, according to aforesaid capacitance matrix, you can learn this
The particular location of capacitive node, is repaired to the capacitive node with facilitating.If the output voltage V of the capacitive noderDo not surpass
Go out default voltage range, then the capacitive node is good.
Step S182, judges whether that all driving ports are scanned, if scanned, terminates to scan and judge to touch
Whether screen is good, if not scanned, continue sequential scan and drives port.
Specifically, when scanning is to a driving port, all capacitive nodes under 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 the mouth of moved end, judge whether that all driving ports are scanned, that is, whether judge current driving port
For last driving port, if currently driving port to drive port for last, all driving ports are scanned, knot
Beam scanning, and judge whether touch screen is good according to the quantity of the bad capacitive node of record.Further, if bad electric capacity
The quantity of node is more 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 not to be that last drives port, and not all drive end mouth being all scanned, then continuation order
Turntable driving port, until all driving ports it is scanned.
So, all driving ports are scanned, and detects that each drives the sensor port of each capacitive node under port
Output voltage Vr, can comprehensively detect whether each capacitive node of touch screen is good, it is to avoid omit, Detection results are good,
It is prevented effectively from failure screen body to come into the market.Simultaneously for bad touch screen, can be with the bad capacitive node according to record
Particular location is targetedly repaired, and is repaired easy, and can be improved the utilization rate of resource, it is to avoid wastes.
Fig. 6 is refer to, is the structural representation of the detection means of the capacitive touch screen of an embodiment.Touch screen includes many
Individual capacitive node.As shown in fig. 6, a kind of detection means of capacitive touch screen, including：
Detection time point setting module 130, for the circuit according to touch screen time constant design load setting detection when
Between point；
Control source module 160, for providing input voltage to touch screen, and starts timing；
Output voltage detection module 170, for detecting the output voltage of the capacitive node of touch screen in detection time point, if
The output voltage of at least one capacitive node exceeds default voltage range, then touch screen is bad；
Judge module 180, for judging whether that the output voltage of at least one capacitive node exceeds default voltage model
Enclose, if so, touch screen is bad, if it is not, then touch screen is good.
The detection means of above-mentioned capacitive touch screen, time constant of the detection time point setting module 130 according to the circuit
Design load, 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, if output voltage exceeds default voltage range, illustrates that the time of touch screen is normal
Number actual value deviation time constant design load is excessive, and the void for causing circuit is disconnected or empty short, ineffective so as to cause touch screen to touch
It is quick.Therefore, the detection means is able to detect that the inreal open circuit of the circuit of touch screen, but there are empty disconnected or empty short feelings
Condition, Detection results are good, are prevented effectively from failure screen body stream to client.
Wherein in one embodiment, the detection means of capacitive touch screen also includes：
Port setup module, for arranging the port of the sensor port of the port numbers and touch screen of the driving port of touch screen
Number；
Driving voltage setup module, for arranging input voltage for pulse voltage；
Voltage range setup module, for determining the time constant scope of circuit according to time constant design load, wherein, when
Between constant range include time constant design load, and default voltage range is calculated according to time constant scope and pulse voltage.
Wherein in one embodiment, output voltage detection module is additionally operable to sequential scan and drives port, detects each drive
The output voltage of the sensor port of each capacitive node under the mouth of moved end, and store output voltage；
Judge module is additionally operable to judge that output voltage, whether beyond default voltage range, if so, then judges capacitive node
It is bad, and the port numbers for driving port and sensor port of bad capacitive node are recorded, if it is not, then judging that capacitive node is good
It is good；Judge module is additionally operable to judge whether that all driving ports are scanned, if scanned, terminates to scan and judge to touch
Whether screen is good, if not scanned, continue sequential scan and drives port.
Each technical characteristic of embodiment described above arbitrarily can be combined, for making description succinct, not to above-mentioned reality
Apply 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, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more concrete and detailed, but and
Therefore can not be construed as limiting the scope of the patent.It should be pointed out that for one of ordinary skill in the art comes
Say, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (10)
1. a kind of detection method of capacitive touch screen, the touch screen include multiple capacitive nodes, it is characterised in that including step
Suddenly:
According to the time constant design load setting detection time point of the circuit of the touch screen；
Input voltage is provided to the touch screen, and starts timing；
The output voltage of the capacitive node is detected in the detection time point；
Judge whether the output voltage of at least one capacitive node beyond default voltage range, it is if so, then described to touch
Touch screen bad, if it is not, then the touch screen is good.
2. the detection method of capacitive touch screen according to claim 1, it is characterised in that described according to the touch screen
Circuit time constant design load setting detection time point the step of include：
The output voltage curve of the capacitive node is determined according to the time constant design load of the circuit of the touch screen, it is described defeated
Going out voltage curve includes ascent stage and steady section；
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, it is characterised in that described according to the touch screen
The time constant design load of circuit the step of set detection time point as：
The time constant design load is set as the detection time point.
4. the detection method of capacitive touch screen according to claim 1, it is characterised in that described according to the touch screen
Circuit time constant design load setting detection time point the step of before, also including step：
The port numbers of the sensor port of the port numbers and the touch screen of the driving port of the touch screen are set；
The input voltage is set for pulse voltage.
5. the detection method of capacitive touch screen according to claim 4, it is characterised in that described to carry to the touch screen
For input voltage, and the step of start timing before, also including step：
The time constant scope of the circuit, the time constant model of wherein described circuit are determined according to the time constant design load
Enclose including the time constant design load；
The default voltage range is calculated according to the time constant scope and the pulse voltage.
6. the detection method of capacitive touch screen according to claim 5, it is characterised in that described in the detection time
The step of output voltage of the point detection capacitive node, includes：
Port is driven described in sequential scan, detects the induction end of each capacitive node under each described driving port
The output voltage of mouth, and store the output voltage.
7. the detection method of capacitive touch screen according to claim 6, it is characterised in that described to judge whether at least
The output voltage of one capacitive node exceeds default voltage range, and if so, then the touch screen is bad, if it is not, then institute
Stating the good step of touch screen includes：
Judge that the output voltage, whether beyond the default voltage range, if so, then judges that the capacitive node is bad, and
The port numbers and the port numbers of the sensor port of the driving port of the bad capacitive node are recorded, if it is not, then sentencing
The fixed capacitive node is good；
Judge whether that all driving ports are scanned, if scanned, terminate 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 means of capacitive touch screen, the touch screen include multiple capacitive nodes, it is characterised in that include：
Detection time point setting module, for the time constant design load setting detection time of the circuit according to the touch screen
Point；
Control source module, for providing input voltage to the touch screen, and starts timing；
Output voltage detection module, for detecting the output voltage of the capacitive node in the detection time point, judge module,
For judging whether the output voltage of at least one capacitive node beyond default voltage range, the if so, touch
Screen is bad, if it is not, then the touch screen is good.
9. the detection means of capacitive touch screen according to claim 8, it is characterised in that also include：
Port setup module, for arranging the port numbers and the sensor port of the touch screen of the driving port of the touch screen
Port numbers；
Driving voltage setup module, for arranging the input voltage for pulse voltage；
Voltage range setup module, for determining the time constant scope of the circuit according to the time constant design load, its
In, the time constant scope includes the time constant design load, and according to the time constant scope and pulse electricity
Pressure calculates the default voltage range.
10. the detection means of capacitive touch screen according to claim 9, it is characterised in that
The output voltage detection module is additionally operable to drive port described in sequential scan, detects every under each described driving port
The output voltage of the sensor port of the individual capacitive node, and store the output voltage；
The judge module is additionally operable to judge that the output voltage, whether beyond the default voltage range, if so, then judges
The capacitive node is bad, and records the driving port and the port of the sensor port of the bad capacitive node
Number, if it is not, then judging that the capacitive node is good；The judge module is additionally operable to judge whether all driving port scans
Finish, if scanned, terminate to scan and judge whether the touch screen is good, if not scanned, continuation order is swept
Retouch the driving port.
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