CN103543344B - A kind of method solving capacitance plate inefficacy and capacitance plate abnormity detecting circuit - Google Patents
A kind of method solving capacitance plate inefficacy and capacitance plate abnormity detecting circuit Download PDFInfo
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Abstract
The invention discloses a kind of method solving capacitance plate inefficacy and capacitance plate abnormity detecting circuit, described method includes: arrange an abnormal signal output circuit, receives a pulse signal of capacitance plate output to described abnormal signal output circuit；Described pulse signal is carried out time delay, reversely rear output to HOST CPU by described abnormal signal output circuit；CPU receives the signal after reversely, it may be judged whether occurs abnormal, and when an anomaly occurs, carries out interrupt processing, recovers described capacitance plate.Present invention also offers a kind of capacitance plate abnormity detecting circuit.By increasing partial circuit on touch screen or mainboard, to whether capacitance plate is detected extremely, if occurring abnormal, by HOST CPU, capacitance plate is restarted so as to recover normal operation, thus taking few system resource, to the power consumption of complete machine substantially without increasing burden, and this judges and the restarting process time is very short, user is substantially free of sensation, does not interfere with the experience of user.
Description
Technical field
The present invention relates to human-computer interaction technique field, particularly relate to multipoint touch control capacitive screen, solve, it particularly relates to a kind of, method and the capacitance plate abnormity detecting circuit that capacitance plate lost efficacy.
Background technology
At present, main flow smart mobile phone and panel computer are all configured with capacitance plate, although capacitance plate has, high sensitivity, permeability are good, touch-control is accurate, without advantages such as firmly pressings, but the shortcoming that there is the easy distortion of color, under the environment of moist high temperature, particularly it is susceptible to the phenomenon of operation drift, it addition, capacitance touch screen there is also cost fragile flimsy defect higher, internal.
Especially desirable it is emphasised that, capacitance touch screen have magnetic field impact, temperature or humidity changes greatly or staff electrostatic big in, the temporary transient inefficacy of non-damaging can often occur, such as phone comes, but mobile phone is ringing always cannot be carried out answering operation exactly, now generally requiring and pull out battery and turn back on capacitance plate just can be made to recover normal operation, and such frequent operation certainly will have a strong impact on the experience of user.
Summary of the invention
Embodiments providing a kind of method and capacitance plate abnormity detecting circuit that capacitance plate lost efficacy that solve, there is problem when losing efficacy in solution capacitance plate.
In order to realize aforementioned invention purpose, a kind of method solving capacitance plate inefficacy that the embodiment of the present invention provides is achieved through the following technical solutions:
A kind of method solving capacitance plate inefficacy, described method includes:
One abnormal signal output circuit is set, receives a pulse signal of capacitance plate output to described abnormal signal output circuit；
Described pulse signal is carried out time delay, reversely rear output to HOSTCPU by described abnormal signal output circuit；
CPU receives the signal after reversely, it may be judged whether occurs abnormal, and when an anomaly occurs, carries out interrupt processing, recovers described capacitance plate.
Further, described in judge whether to occur abnormal, and when an anomaly occurs, carry out interrupt processing, recover described capacitance plate and specifically include:
If described reversely after signal be high level, then do not do any process, if low level, then carry out abnormal interruption process, directly power on to described capacitance plate and restart.
Further, described pulse signals carries out time delay and specifically includes:
Adjust the capacitance C and magnitude of voltage R of charge-discharge circuit so that it is meet following condition:
Wherein, t is the discharge and recharge time, and VIL is the low-level input voltage of negater circuit, and VCC is supply voltage.
In order to realize aforementioned invention purpose, the embodiment of the present invention additionally provides a kind of capacitance plate abnormity detecting circuit, and described capacitance plate abnormity detecting circuit is to be realized by following technical scheme:
A kind of capacitance plate abnormity detecting circuit, described circuit includes:
Capacitance plate MCU, abnormal signal output circuit, wherein, described abnormal signal output circuit input connects capacitance plate MCU, and described abnormal signal output circuit outfan connects host CPU to send interrupt signal.
Further, described abnormal signal output circuit includes:
On-off circuit, is used for detecting the pulse signal of touch screen；
Delay circuit, is used for described pulse signal is carried out time delay, obtains time delayed signal；
Negater circuit, is used for described time delayed signal being carried out reversely and exporting.
Further, described on-off circuit is a transistor circuit.
Further, described delay circuit is a RC charge-discharge circuit.
The embodiment of the present invention by increasing partial circuit on touch screen or mainboard, to capacitance plate, whether normal operation carries out detecting judgement, if it find that it is abnormal, capacitance plate is restarted so as to recover normal operation by HOSTCPU when without re-powering, thus taking few system resource.It addition, this kind of scheme to the power consumption of complete machine substantially without increasing burden, and this judges and the restarting process time is very short, and user is substantially free of sensation, does not interfere with the experience of user.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is capacitance plate circuit diagram；
Fig. 2 is the condenser network schematic diagram that the embodiment of the present invention adds abnormity detecting function；
Fig. 3 is the composition schematic diagram of embodiment of the present invention capacitance plate abnormity detecting circuit；
Fig. 4 is the composition schematic diagram of embodiment of the present invention capacitance plate abnormity detecting circuit；
Fig. 5 is the oscillogram of embodiment of the present invention capacitance plate abnormity detecting input and output；
Fig. 6 is the embodiment of the present invention host CPU flow chart to capacitance plate abnormality processing.
Detailed description of the invention
In order to make the purpose of the embodiment of the present invention, technical scheme and advantage are clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is carried out clear, complete description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
As it is shown in figure 1, be the schematic diagram of conventional touch screen circuit, first introducing the operation principle of capacitance plate for this figure, in figure, signal instruction is as follows:
I2C: be responsible for the MCU communication of hostCPU and TP (touch screen).
VDD:TP module for power supply
The MCU of RST:resetTP
INT:TP has the interrupt signal produced during operation to hostCPU
As shown in Figure 1, at present, the capacitance plate of market substantially all can have a DriverIC (display floater driving), be equivalent to the MCU (microcontroller) of capacitance plate, and the working method of capacitance plate informs the coordinate information of hostCPU (host CPU) current touch generally by the mode of down trigger and the communication of I2C, this touch information is processed by hostCPU accordingly, and shows on a display screen.
But, when running into, humiture changes greatly, greatly or during the unusual condition such as the ESD of staff, capacitance plate has probabilistic temporarily losing efficacy to changes of magnetic field, and capacitance plate now does not have expendable damage.
In order to realize the process to capacitance plate exception (including restorability exception or irrecoverable sexual abnormality), a kind of method solving capacitance plate inefficacy that the embodiment of the present invention provides is achieved through the following technical solutions:
A kind of method solving capacitance plate inefficacy, described method includes:
One abnormal signal output circuit is set, receives a pulse signal of capacitance plate output to described abnormal signal output circuit；
Described pulse signal is carried out time delay, reversely rear output to HOSTCPU by described abnormal signal output circuit；
CPU receives the signal after reversely, it may be judged whether occurs abnormal, and when an anomaly occurs, carries out interrupt processing, recovers described capacitance plate.
When CPU receives abnormal signal, as shown in Figure 6, going to attempt communicating with TP by I2C, if communication OK, illustrate that TP simply of short duration inefficacy occurs, recovered normal communication at present, touch screen fault is excluded, does not remake any abnormality processing.
If CPU and TP Communications failure, then processing this exception, restart touch screen, namely again according to electrifying timing sequence TP being powered on makes TP recover normal operation, reattempts afterwards and carries out I2C communication with touch screen, if communication is normal, then abnormality processing is complete；If or communication cannot be carried out with TP and touch screen, then report creates the exception that cannot repair.
As shown in Figure 2, in order to detect above-mentioned exception, the embodiment of the present invention designs an abnormal signal output circuit for touch screen circuitry, when the MCU of TP detects abnormal signal, export this abnormal signal TP_OUTPUT, so that this abnormal signal is passed to HOSTCPU, this signal is low effectively, enables HOSTCPU that this exception is made corresponding subsequent treatment.Namely when the MCU of TP detect TP the regular hour without response time, a low signal can be produced and give hostCPU；It is known that TP occurs abnormal after HostCPU detects this signal step-down, meeting resetTP, again according to electrifying timing sequence, TP is powered on.
As it is shown on figure 3, this abnormal signal output circuit includes:
On-off circuit, is used for detecting the pulse signal of touch screen；
Delay circuit, is used for described pulse signal is carried out time delay, obtains time delayed signal；
Negater circuit, is used for described time delayed signal being carried out reversely and exporting.
It is illustrated in figure 4 the particular make-up of this abnormal signal output circuit, illustrates as follows:
Input: signal comes in the MCU of TP, is a pulse signal.
Output: for the output signal of not gate, is connected with hostMCU.
The triode switch of T1:PNP
SN74AHC1G04: not gate device, negater circuit
The abnormal signal of this abnormal signal output circuit output TP, preferably duty such as following table:
In conjunction with upper table, its operation principle is as follows:
1., when TP normal operation time, the MCU of TP sends a periodic pulse signal output to the base stage of switch triode, opens 3V power supply simultaneously.For the recurrent pulse of 1ms, namely send the low pulse signal of a 0.1ms every 1ms.
0.9ms before low pulse arrives, output is high, now PNP cut-off, electric capacity is charged by the power supply of 3V by R1 and C1, now A point will not jump to high level quickly, jumping to the high time is determined by the value of R1 and C1, can require to set charging (or electric discharge) time according to concrete product design.
Such as, controlling the voltage of A point within the time of 0.9ms lower than the VIL=0.9V of U1 by adjusting the value of R1 and C1, namely when t=0.9ms, the value adjusting R1, C1 makes it meet following relation:
Now the pin2 of U1 is low level, is undertaken after reversely by negater circuit, and exporting to hostCPU is high level.When the low pulse of 0.1ms arrives, T1 opens electric capacity and discharges rapidly, and now the pin2 of U1 is low.Exporting to hostCPU is high level.
2, during TP abnormal work:
High level makes T1 end, and C1 is directly charged by the power supply of 3V, and after reaching certain time, the pin2 of U1 becomes high level, and the now output of U1 becomes low, and hostCPU receives a low pulse signal.
Oscillogram in conjunction with such as Fig. 5 is known: when TP normal operation time, TPoutput is high to hostCPU always, it does not have receive the abnormal signal of interruption, when TP is in abnormal time, TPOutput is low level to the signal of hostCPU, at this moment produces abnormal interrupt signal.
When CPU receives abnormal signal, as shown in Figure 6, going to attempt communicating with TP by I2C, if communication OK, illustrate that TP simply of short duration inefficacy occurs, recovered normal communication at present, touch screen fault is excluded, does not remake any abnormality processing.
If CPU and TP Communications failure, then processing this exception, restart touch screen, namely again according to electrifying timing sequence TP being powered on makes TP recover normal operation, reattempts afterwards and carries out I2C communication with touch screen, if communication is normal, then abnormality processing is complete；If or communication cannot be carried out with TP and touch screen, then report creates the exception that cannot repair.
The embodiment of the present invention by increasing partial circuit on touch screen or mainboard, to capacitance plate, whether normal operation carries out detecting judgement, if it find that it is abnormal, capacitance plate is restarted so as to recover normal operation by HOSTCPU when without re-powering, thus taking few system resource.It addition, this kind of scheme to the power consumption of complete machine substantially without increasing burden, and this judges and the restarting process time is very short, and user is substantially free of sensation, does not interfere with the experience of user.
Those skilled in the art will recognize that; above-mentioned detailed description of the invention is illustrative of; it is to enable those skilled in the art to be better understood from this patent content; should not be understood as the restriction to this patent protection domain; as long as any equivalent change made according to the disclosed spirit of this patent or modification, each fall within this patent protection domain.
Claims (4)
1. one kind solves the method that capacitance plate lost efficacy, it is characterised in that described method includes:
One abnormal signal output circuit is set, receives a pulse signal of capacitance plate output to described abnormal signal output circuit；
Described pulse signal is carried out time delay by described abnormal signal output circuit, reversely rear output is to HOSTCPU, and described pulse signals carries out time delay and specifically includes:
Adjust the capacitance C and magnitude of voltage R of charge-discharge circuit so that it is meet following condition:
Wherein, t is the discharge and recharge time, and VIL is the low-level input voltage of negater circuit, and VCC is supply voltage；
CPU receives the signal after reversely, it may be judged whether occurs abnormal, and when an anomaly occurs, carries out interrupt processing, recovers described capacitance plate.
2. as claimed in claim 1 solve the method that capacitance plate lost efficacy, it is characterised in that described in judge whether to occur abnormal, and when an anomaly occurs, carry out interrupt processing, recover described capacitance plate and specifically include:
If described reversely after signal be high level, then do not do any process, if low level, then carry out abnormal interruption process, directly power on to described capacitance plate and restart.
3. a capacitance plate abnormity detecting circuit, it is characterised in that described circuit includes:
Capacitance plate MCU, abnormal signal output circuit, wherein, described abnormal signal output circuit input connects capacitance plate MCU, and described abnormal signal output circuit outfan connects host CPU to send interrupt signal, and described abnormal signal output circuit includes:
On-off circuit, is used for detecting the pulse signal of touch screen；
Delay circuit, is used for described pulse signal is carried out time delay, obtains time delayed signal, and institute's delay circuit is a RC charge-discharge circuit: wherein, adjusts the capacitance C and magnitude of voltage R of charge-discharge circuit so that it is meet following condition:Wherein, t is the discharge and recharge time, and VIL is the low-level input voltage of negater circuit, and VCC is supply voltage；
Negater circuit, is used for described time delayed signal being carried out reversely and exporting.
4. capacitance plate abnormity detecting circuit as claimed in claim 3, it is characterised in that described on-off circuit is a transistor circuit.
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| CN201210237195.2A CN103543344B (en) | 2012-07-10 | 2012-07-10 | A kind of method solving capacitance plate inefficacy and capacitance plate abnormity detecting circuit |
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| CN201210237195.2A CN103543344B (en) | 2012-07-10 | 2012-07-10 | A kind of method solving capacitance plate inefficacy and capacitance plate abnormity detecting circuit |
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| CN104023139B (en) * | 2014-06-19 | 2020-05-15 | 陈惠金 | Mobile terminal and exception handling method thereof |
| CN106547667B (en) * | 2015-09-16 | 2020-05-22 | 比亚迪股份有限公司 | Fault prompting method and system for mobile terminal |
| CN105739767B (en) * | 2016-01-28 | 2021-05-18 | 厦门雅迅网络股份有限公司 | Automatic recovery method for touch screen function failure |
| KR20180078705A (en) * | 2016-12-30 | 2018-07-10 | 엘지디스플레이 주식회사 | Touch Display Device |
| CN207249643U (en) * | 2017-09-13 | 2018-04-17 | 广州视源电子科技股份有限公司 | Touch display system |
| CN107861818B (en) * | 2017-11-30 | 2022-01-14 | 努比亚技术有限公司 | Memory cleaning method based on TP and LCD, mobile terminal and storage medium |
| CN108833687A (en) * | 2018-05-29 | 2018-11-16 | 努比亚技术有限公司 | Terminal prot open method, terminal and computer readable storage medium |
| CN113110758B (en) * | 2021-04-19 | 2023-01-20 | 惠州Tcl云创科技有限公司 | Method and system for processing touch failure of touch screen during startup and intelligent terminal |
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| CN101976161A (en) * | 2010-07-27 | 2011-02-16 | 苏州瀚瑞微电子有限公司 | Method for detecting capacitive touch screen |
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| KR100278926B1 (en) * | 1998-05-25 | 2001-01-15 | 김영환 | Pulley on-chip wafer level burn-in test circuit and its method |
| JP2003167545A (en) * | 2001-11-30 | 2003-06-13 | Sharp Corp | Method for detecting abnormality of image display signal, and image display device |
| CN101971242B (en) * | 2008-03-19 | 2013-04-10 | 夏普株式会社 | Display panel driving circuit, liquid crystal display device, shift register, liquid crystal panel, and display device driving method |
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