WO2019127213A1 - 噪声消除电路及触控装置 - Google Patents

噪声消除电路及触控装置 Download PDF

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WO2019127213A1
WO2019127213A1 PCT/CN2017/119394 CN2017119394W WO2019127213A1 WO 2019127213 A1 WO2019127213 A1 WO 2019127213A1 CN 2017119394 W CN2017119394 W CN 2017119394W WO 2019127213 A1 WO2019127213 A1 WO 2019127213A1
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threshold
unit
noise
received signal
ratio
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PCT/CN2017/119394
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English (en)
French (fr)
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梁颖思
文亚南
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深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to CN201780002320.2A priority Critical patent/CN110214302B/zh
Priority to PCT/CN2017/119394 priority patent/WO2019127213A1/zh
Publication of WO2019127213A1 publication Critical patent/WO2019127213A1/zh

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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

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  • the present invention relates to a noise canceling circuit and a touch device, and more particularly to a noise canceling circuit and a touch device capable of eliminating impulse noise.
  • the operational interfaces of various electronic products have gradually become more humanized in recent years.
  • the user can directly operate on the screen with a finger or a stylus, input a message/text/pattern, and save the trouble of using an input device such as a keyboard or a button.
  • the touch screen usually consists of a sensing panel and a display disposed behind the sensing panel.
  • the electronic device determines the intention of the touch according to the position touched by the user on the sensing panel and the picture presented by the display at that time, and executes the corresponding operation result.
  • the touch device is subject to display noise (noise from the display).
  • display noise may have pulse-type noise (hereinafter referred to as impulse noise), and impulse noise has a large amplitude in an instant.
  • impulse noise may occur when the display screen of the display screen needs to switch its screen color in a short time, which is an unavoidable factor in the actual operation of the touch device.
  • ADC analog to digital converter
  • the amplifier or analog to digital converter (ADC) in the touch device can be easily saturated, and the dynamics of the amplifier or analog to digital converter cannot be effectively used.
  • the range is (Dynamic Range) and the gain of the overall circuit is therefore limited.
  • impulse noise reduces the Signal to Noise Ratio when calculating touch coordinates.
  • an object of some embodiments of the present application is to provide a noise canceling circuit and a touch device capable of eliminating impulse noise to improve the disadvantages of the prior art.
  • the comparison output signal retains the received signal in the time interval; wherein, when the received signal is When the time interval has an amplitude greater than the threshold, the comparison output signal discards the received signal in a region A received signal; wherein, said section comprising said time interval and at a point in time before the time segment, corresponding to an amplitude of the received signal at the time point is greater than the threshold time point.
  • the first ratio is that in the plurality of time intervals, the coordinate calculation unit successfully calculates touch coordinates and reports a ratio of the touch coordinates to the touch device.
  • the threshold unit further includes a noise detecting unit configured to perform a noise detecting operation on the received signal to generate a detection result, wherein the adjusting unit determines whether to adjust the threshold according to the detection result;
  • the noise detection operation separates the noise in the received signal from a charger noise and a display noise.
  • the adjustment unit increases the threshold when the detection result indicates that the amplitude of the charger noise is greater than the amplitude of the display screen noise.
  • the adjusting unit increases the threshold when the display screen noise is less than the threshold.
  • the comparison output signal discards the received signal of the received signal in the sector
  • the value of the comparison output signal in the sector is 0 or a fixed level.
  • the present application may first detect whether the received signal from the receiving electrode of the touch device has impulse noise, and when the received signal has impulse noise, the partial signal near the impulse noise may be received. Discard, without subsequent signal processing and operation on the part of the received signal.
  • FIG. 1 is a schematic diagram of a touch device 10 according to an embodiment of the present application.
  • the touch device 10 includes a plurality of receiving electrodes, a front end circuit 18, a noise canceling circuit 11, a signal processing unit 15, and a coordinate calculating unit 16.
  • the noise canceling circuit 11 includes a threshold unit 12 and a comparing unit 14.
  • FIG. 1 only shows one of the plurality of receiving electrodes of the touch device 10 as the receiving electrode RXE.
  • the front end circuit 18 may include a front end (Front End) circuit component such as a filter or an amplifier. In some embodiments, the front end circuit 18 may include an analog to digital converter.
  • the front end circuit 18 is coupled to the receiving electrode RXE for generating a receiving.
  • the comparing unit 14 compares the received signal RX with the threshold Th. When the absolute value/amplitude of the received signal RX is less than the threshold Th in a time interval T, the comparing unit 14 compares the received signal in the time interval T.
  • the RX is reserved and output to the signal processing unit 15.
  • the time interval T may be an integration window interval (Integration Window Interval) of the integrator in the signal processing unit 15.
  • the comparing unit 14 discards the partial received signal of the segment S in the time interval T and before the time instant t in the received signal RX (Abandon/Discard) instead of the segment S. This portion of the received signal is output to the signal processing unit 15, or the comparison unit 14 directly discards part of the received signal in the received signal RX over the entire time interval T without outputting it to the signal processing unit 15.
  • the received signal RX has a pulse greater than the threshold Th (which may be impulse noise from the display screen) at a time instant t1 in the time interval T1, that is, the received signal RX has an amplitude greater than the threshold Th in the time interval T1.
  • the absolute value of the received signal RX is greater than the threshold Th in the time interval T1.
  • the comparison unit 14 may receive the received signal RX in a region.
  • the partial received signal RX S1 of the segment S1 is discarded without outputting the partial received signal RX S1 to the signal processing unit 15 to generate a comparison output signal VCP1, wherein the segment S1 is in the time interval T1 and before the time instant t1 a segment, and a portion of the received signal RX S1 is a partial signal of the received signal RX in the segment S1, and the comparison output signal VCP1 may be 0 or a fixed value at a signal value corresponding to the segment S1, and the comparison output signal VCP1 is
  • the signal value corresponding to a segment S1' may be the same as the signal value of the received signal RX in the segment S1', as shown in FIG. 2, wherein the segment S1' is a time zone in the time interval T1 and after the time instant t1. segment.
  • the comparing unit 14 may directly discard the partial received signal RX T1 in the received signal RX in the time interval T1 without the portion
  • the received signal RX T1 is output to the signal processing unit 15 to generate a comparison output signal VCP2, wherein the partial received signal RX T1 is a partial signal of the received signal RX in the time interval T1, and the comparison output signal VCP2 is corresponding to the time interval T1.
  • the signal value can be 0 or a fixed value (ie a fixed level) as shown in Figure 2.
  • the threshold value Th may be adjusted according to the actual situation.
  • FIG. 3 is a schematic diagram of the threshold unit 12 according to the embodiment of the present application.
  • the threshold unit 12 can include a ratio unit 120 and an adjustment unit 122.
  • the ratio unit 120 is configured to calculate a first ratio R
  • the adjustment unit 122 is configured to adjust the threshold Th according to the first ratio R.
  • the first ratio R may be related to a ratio of a time interval in which the received signal RX is reserved by the comparing unit 14 and output to the signal processing unit 15 in a plurality of time intervals, for example, assuming that the received signal RX lasts for N time intervals T1 ⁇ TN, in the time interval T1 to TN, the comparison unit 14 retains k time intervals T(1) to T(k) in the time intervals T1 to TN (that is, the received signal RX is in the time interval T(1) to T(k). The amplitudes in both are less than the threshold Th), and the first ratio R may be related to or equal to k/N.
  • the lowest ratio value RL and the specific value ⁇ may be determined according to actual conditions.
  • FIG. 4 is a schematic diagram of a threshold unit 42 according to an embodiment of the present application.
  • Threshold unit 42 is similar to threshold unit 12, so the same components follow the same symbols.
  • the threshold unit 42 further includes a noise detecting unit 44 that performs a noise detection operation on the noise in the receiving electrode RX to separate the noise in the receiving electrode RX into Noise from the display (ie, display noise) and noise from the charger (ie, charger noise), and produces a detection result RND that can represent various different noise conditions in the received signal, such as A type of noise is the main noise, how large is the amplitude of a certain noise, or whether there is a pulse characteristic of some kind of noise.
  • the adjusting unit 122 may determine whether to increase the threshold Th by the detection result RND.
  • the noise detecting unit 44 can calculate the amplitude of the charger noise and the amplitude of the display noise.
  • the detection result RND shows that the amplitude of the charger noise is greater than the amplitude of the display noise, it represents the receiving electrode RX at this time.
  • the noise is mainly dominated by the charger noise, and the impulse noise from the display screen does not affect the back-end circuit.
  • the adjustment unit 122 can increase the threshold Th.
  • the comparison unit of the present application uses the comparison received signal and the threshold to determine the presence or absence of impulse noise.
  • the comparison unit discards part of the received signal near the impulse noise, and the back end circuit does not Signal processing and calculation of some received signals near the impulse noise.
  • the threshold unit of the present application can adjust the threshold according to the actual situation to more effectively eliminate the influence of the impulse noise.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

一种应用于触控装置(10)的噪声消除电路(11),包括阈值单元(12)以及比较单元(14),阈值单元(12)用来计算阈值(Th),比较单元(14)用来比较接收信号(RX)与阈值(Th);其中,当接收信号(RX)于时间区间中具有大于阈值的振幅(Th)时,比较单元(14)将接收信号(RX)于一区段的部份接收信号丢弃而不输出至信号处理单元(15);其中,所述区段包括所述时间区间中且于一时间瞬间以前的时间区段,所述时间瞬间对应所述接收信号大于所述阈值的时间。

Description

噪声消除电路及触控装置 技术领域
本申请涉及一种噪声消除电路及触控装置,尤其涉及一种可消除脉冲噪声的噪声消除电路及触控装置。
背景技术
随着科技日益进步,近年来各种电子产品的操作接口逐渐人性化。举例而言,透过触控面板,使用者可直接以手指或触控笔在屏幕上操作、输入讯息/文字/图样,省去使用键盘或按键等输入设备的麻烦。实际上,触控屏通常由一感应面板及设置于感应面板后方的显示器组成。电子装置根据用户在感应面板上所触碰的位置,以及当时显示器所呈现的画面,来判断该次触碰的意图,并执行相对应的操作结果。
详细来说,触控装置会受到显示屏噪声(来自显示屏的噪声)干扰。一般来说,显示屏噪声可能具有脉冲型的噪声(以下简称脉冲噪声),脉冲噪声在瞬间具有极大的振幅。脉冲噪声可能出现在显示屏的显示画面需要在短时间内切换其画面颜色时,其为触控装置在实际操作中不可避免的因子。当脉冲噪声被传递至触控装置时,会使触控装置中的放大器或模拟数字转换器(Analog to Digital Convertor,ADC)很容易地达到饱和,而无法有效使用放大器或模拟数 字转换器的动态范围(Dynamic Range),且整体电路的增益也因此受限。另一方面,脉冲噪声会降低计算触控坐标时的信噪比(Signal to Noise Ratio)。
因此,现有技术实有改进之必要。
发明内容
因此,本申请部分实施例的目的即在于提供一种可消除脉冲噪声的噪声消除电路及触控装置,以改善现有技术的缺点。
为了解决上述技术问题,本申请实施例提供了一种噪声消除电路,应用于一触控装置,所述噪声消除电路包括一阈值单元,用来计算一阈值;以及一比较单元,耦接于所述触控装置的一接收电极以及所述阈值单元,以接收一接收信号以及所述阈值,所述比较单元用来比较所述接收信号与所述阈值,以对应输出一比较输出信号;其中,所述触控装置的一信号处理单元对所述比较单元的一比较输出信号进行信号处理,所述触控装置的一坐标计算单元根据所述信号处理单元的一输出信号,计算对应于触摸事件的触摸坐标;其中,当于一时间区间中所述接收信号的振幅皆小于所述阈值时,所述比较输出信号保留所述时间区间中的所述接收信号;其中,当所述接收信号于所述时间区间中具有大于所述阈值的振幅时,所述比较输出信号丢弃所述接收信号于一区段的接收信号;其中,所述区段包括所述时间区间中且于一时间点之前的时间区段,所述时间点对应所述接收信号的振幅大于所述阈值的时间点。
例如,当所述接收信号于所述时间区间中具有大于所述阈值的振幅时,所述比较输出信号丢弃所述接收信号于所述时间区间的接收信号。
例如,所述阈值单元包括一比率单元,用来计算一第一比率,其中所述第一比率相关于所述接收信号于多个时间区间中被所述比较单元保留的时间区间的比率;以及一调整单元,用来根据所述第一比率,调整所述阈值;其中,当所述第一比率小于一最低比率值时,所述调整单元将所述阈值调高。
例如,当所述第一比率大于一最高比率值时,所述调整单元将所述阈值调低。
例如,所述第一比率为于所述多个时间区间中,所述坐标计算单元成功计算触摸坐标并呈报所述触摸坐标至所述触控装置的比率。
例如,所述阈值单元还包括一噪声检测单元,用来对所述接收信号进行一噪声检测运算,以产生一检测结果;其中,该调整单元根据该检测结果,决定是否要调整该阈值;其中,该噪声检测运算将该接收信号中的噪声分离出一充电器噪声以及一显示屏噪声。
例如,当所述检测结果显示所述充电器噪声的振幅大于所述显示屏噪声的振幅时,该调整单元将该阈值调高。
例如,当所述显示屏噪声皆小于所述阈值时,该调整单元将该阈值调高。
例如,当所述比较输出信号丢弃所述接收信号于该区段的接收信号时,于该区段中所述比较输出信号的值为0或固定电平。
本申请实施例提供了一种触控装置,包括一噪声消除电路,包括一阈值单元,用来计算一阈值;以及一比较单元,耦接于所述触控装置的一接收电极以及所述阈值单元,以接收一接收信号以及所述阈值,所述比较单元用来比较所述接收信号与所述阈值,以对应输出一比较输出信号;一信号处理单元,耦接于所述比较单元,对所述比较单元的一比较输出信号进行信号处理,以产生一输出信号;以及一坐标计算单元,耦接于所述信号处理单元,用来根据所述输出信号,计算对应于触摸事件的坐标;其中,当于一时间区间中所述接收信号的振幅皆小于所述阈值时,所述比较输出信号保留所述时间区间中的所述接收信号;其中,当所述接收信号于所述时间区间中具有大于所述阈值的振幅时,所述比较输出信号丢弃所述接收信号于一区段的部份接收信号;其中,所述区段包括所述时间区间中且于一时间点之前的时间区段,所述时间点对应所述接收信号的振幅大于所述阈值的时间点。
本申请实施例的比较单元利用比对接收信号与阈值来判断脉冲噪声的存在与否,当脉冲噪声存在时,比较单元将脉冲噪声附近的部份接收信号丢弃,而其后端电路可不对脉冲噪声附近的部份接收信号进行信号处理及运算。另外,本申请的阈值单元可视实际状况调整阈值,以更有效地排除脉冲噪声的影响。
附图说明
图1为本申请实施例一触控装置的示意图;
图2为本申请实施例多个波形图。
图3为本申请实施例一阈值单元的示意图;
图4为本申请实施例一阈值单元的示意图;
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本申请进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本申请,并不用于限定本申请。
为了排除脉冲噪声对触控信号的影响,本申请可先侦测来自触控装置接收电极的接收信号是否具有脉冲噪声,当接收信号具有脉冲噪声时,可将该脉冲噪声附近的部份接收信号丢弃,而不对该部份接收信号进行后续信号处理及运算。
具体来说,请参考图1,图1为本申请实施例一触控装置10的示意图。触控装置10包括多个接收电极、一前端电路18、一噪声消除电路11、一信号处理单元15以及一坐标计算单元16,噪声消除电路11包括一阈值单元12以及一比较单元14。为了方便说明,图1仅绘示触控装置10的多个接收电极中的一个接收电极RXE。前端电路18可包含滤波器或放大器等前端(Front End) 电路组件,于某些实施例中,前端电路18可包含模拟数字转换器,前端电路18耦接于接收电极RXE,用来产生一接收信号RX。比较单元14耦接于前端电路18以及阈值单元12,以接收接收信号RX以及一阈值Th。比较单元14用来比较接收信号RX与阈值Th,并根据接收信号RX与阈值Th之间的比较结果输出一比较输出信号VCP。信号处理单元15耦接于比较单元14,其可包含混波器、积分器、模拟数字转换器等相关于信号处理的电路组件,信号处理单元15对比较输出信号VCP进行混波、积分、模拟数字转换器等信号处理,以产生一输出信号VS。坐标计算单元16用来根据输出信号VS,计算对应于触摸事件的坐标。另外,阈值单元12用来输出阈值Th。
详细来说,比较单元14将接收信号RX与阈值Th进行比对,当于一时间区间T中接收信号RX的绝对值/振幅皆小于阈值Th时,比较单元14将时间区间T中的接收信号RX保留并输出至信号处理单元15。其中,时间区间T可为信号处理单元15中积分器的一个积分窗区间(Integration Window Interval)。另一方面,为了排除来自显示屏的脉冲噪声对后端电路的影响,当接收信号RX于时间区间T中具有大于阈值Th的脉冲/振幅时(或当接收信号RX的绝对值于时间区间T中大于阈值Th时),比较单元14将接收信号RX中于时间区间T中且于一时间瞬间t以前的一区段S的部份接收信号丢弃(Abandon/Discard)而不将区段S中的这部份接收信号输出至信号处理单元15,或是比较单元14直接将接收信号RX中于整个时间区间T的部份接收信号丢弃而不输出至信号处理单元15。
具体来说,请参考图2,图2为本申请实施例接收信号RX以及比较输出信号VCP1、VCP2的波形图,其中比较输出信号VCP1、VCP2为图1中比较输出信号VCP的二个实施例。接收信号RX在时间上可区分为多个时间区间,为了方便说明,图2仅标示时间区间T1、T2、T3。如图2所示,于时间区间T2、T3中,接收信号RX的振幅皆小于阈值Th,因此,比较单元14将于时间区间T2、T3的接收信号RX保留并输出至信号处理单元15,即比较输出信号VCP1、VCP2于时间区间T2、T3的信号值与接收信号RX于时间区间T2、T3的信号值相同。
另一方面,接收信号RX于时间区间T1中的一时间瞬间t1具有大于阈值Th的一脉冲(其可能是来自显示屏的脉冲噪声),即接收信号RX于时间区间T1具有大于阈值Th的振幅,或是,接收信号RX的绝对值于时间区间T1大于阈值Th。为了排除来自显示屏的脉冲噪声对后端电路(即信号处理单元15、坐标计算单元16以及其后端的电路)的影响,于一实施例中,比较单元14可将接收信号RX中于一区段S1的部份接收信号RX S1丢弃而不将部份接收信号RX S1输出至信号处理单元15,以产生比较输出信号VCP1,其中区段S1为时间区间T1中且于时间瞬间t1以前的时间区段,而部份接收信号RX S1为接收信号RX于区段S1的部份信号,比较输出信号VCP1于对应于区段S1的信号值可为0或一固定值,而比较输出信号VCP1于对应于一区段S1’的信号值可与接收信号RX于区段S1’的信号值相同,如图2所示,其中区段S1’为时间区间T1中且于时间瞬间t1以后的时间区段。
另外,为了排除来自显示屏的脉冲噪声对后端电路的影响,于另一实施例中,比较单元14可直接将接收信号RX中于时间区间T1的部份接收信号RX T1丢弃而不将部份接收信号RX T1输出至信号处理单元15,以产生比较输出信号VCP2,其中部份接收信号RX T1为接收信号RX于时间区间T1的部份信号,比较输出信号VCP2于对应于时间区间T1的信号值可为0或一固定值(即固定电平),如图2所示。
需注意的是,图2仅绘示正向脉冲,因此,于一实施例中,当接收信号RX于时间区间T中具有大于阈值Th的脉冲/振幅时,比较单元14即可进行丢弃部份接收信号RX的操作。另一方面,本申请亦可用于侦测负向脉冲,于另一实施例中,当接收信号RX于时间区间T中具有小于负阈值-Th的脉冲/振幅时,比较单元14即可进行丢弃部份接收信号RX的操作。总而言之,当接收信号RX的绝对值/振幅于时间区间T中大于阈值Th时,比较单元14进行丢弃部份接收信号RX的操作,而输出比较输出信号VCP。
由上述可知,比较单元14可将脉冲噪声附近的部份接收信号(RX S1或RX T1)丢弃,而信号处理单元15、坐标计算单元16以及其后端的电路可不对该部份接收信号(RX S1或RX T1)进行后续信号处理及运算,以排除具有脉冲的显示屏噪声对触控信号的影响。
更进一步地,阈值Th可视实际状况而有所调整,举例来说,请参考图3,图3为本申请实施例阈值单元12的示意图。阈值单元12可包括一比率单元120 以及一调整单元122,比率单元120用来计算一第一比率R,调整单元122用来根据第一比率R,调整阈值Th。其中,第一比率R可相关于接收信号RX于多个时间区间中被比较单元14保留而输出至信号处理单元15的时间区间的比率,举例来说,假设接收信号RX历时N个时间区间T1~TN,于时间区间T1~TN中,比较单元14保留时间区间T1~TN中k个时间区间T(1)~T(k)(即接收信号RX于时间区间T(1)~T(k)中的振幅皆小于阈值Th),第一比率R可相关于或等于k/N。于一实施例中,第一比率R可为坐标计算单元16于一特定时间中成功计算触摸坐标并呈报触摸坐标至触控装置10的比率(即报点率(Report Rate)),其中报点率亦相关于k/N。
当第一比率R太低时,代表可能原本并非脉冲噪声也被判断为脉冲噪声,而被比较单元14丢弃,也就是说,此时阈值Th过低。因此,当调整单元122判断第一比率R小于一最低比率值RL时,调整单元122将阈值Th调高,例如调整后的阈值Th可为未调整的阈值Th加上一特定值Δ(即阈值Th可表示为Th=Th+Δ)。其中,最低比率值RL及特定值Δ可视实际状况而定。
另一方面,当第一比率R太高时,代表阈值Th可能高过某些脉冲噪声的峰值(Peak Value),以至于某些脉冲噪声无法正确地被比较单元14侦测出来,也就是说,此时阈值Th太高。因此,当调整单元122判断第一比率R大于一最高比率值RU时,调整单元122将阈值Th调低,例如调整后的阈值Th可为未调整的阈值Th减去特定值Δ(即阈值Th可表示为Th=Th-Δ)。其中,最高比率值RU可视实际状况而定。
更进一步地,请参考图4,图4为本申请实施例一阈值单元42的示意图。阈值单元42与阈值单元12类似,故相同组件沿用相同符号。与阈值单元12不同的是,阈值单元42另包含一噪声检测单元44,噪声检测单元44对接收电极RX中的噪声进行噪声检测(Noise Detection)运算,以将接收电极RX中的噪声分离出为来自显示屏的噪声(即显示屏噪声)以及来自充电器的噪声(即充电器噪声),并产生一检测结果RND,该检测结果RND可表示接收信号中各种不同噪声的情况,比如是哪一种噪声为主要噪声,某种噪声的振幅有多大,抑或是某种噪声的是否存在脉冲特性。调整单元122可根据检测结果RND,决定是否要将阈值Th调高。
于一实施例中,噪声检测单元44可计算充电器噪声的振幅与显示屏噪声的振幅,当检测结果RND显示充电器噪声的振幅大于显示屏噪声的振幅时,代表此时接收电极RX中的噪声主要由充电器噪声所支配,来自显示屏的脉冲噪声比较不会对后端电路造成影响,在此情形下,调整单元122可将阈值Th调高。
于一实施例中,噪声检测单元44可检测显示屏噪声是否具有脉冲噪声(即检测显示屏噪声是否具有脉冲特性),当于噪声检测的检测结果RND显示显示屏噪声并未具有脉冲噪声(即显示屏噪声不具有脉冲特性)时,比较单元14可保留所有的接收信号,因此,调整单元122可将阈值Th调高。其中,检测噪声是否具有脉冲特性的技术为本领域技术人员所知,如噪声检测单元44可利用高通滤波器来检测噪声是否具有脉冲特性或脉冲噪声,故于此不再赘述。
另外,关于噪声检测单元44将接收电极RX中的噪声分离出显示屏噪声以及充电器噪声的具体电路结构,请参考申请人于国际专利申请号PCT/CN2016/111594中所揭露的内容,于此不再赘述。
综上所述,本申请的比较单元利用比较接收信号与阈值来判断脉冲噪声的存在与否,当脉冲噪声存在时,比较单元将脉冲噪声附近的部份接收信号丢弃,而其后端电路可不对脉冲噪声附近的部份接收信号进行信号处理及运算。另外,本申请的阈值单元可视实际状况调整阈值,以更有效地排除脉冲噪声的影响。
以上所述仅为本申请的部分实施例而已,并不用以限制本申请,凡在本申请的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本申请的保护范围之内。

Claims (18)

  1. 一种噪声消除电路,应用于一触控装置,其特征在于,所述噪声消除电路包括:
    一阈值单元,用来计算一阈值;以及
    一比较单元,耦接于所述触控装置的接收电极以及所述阈值单元,以接收一接收信号以及所述阈值,所述比较单元用来比较所述接收信号与所述阈值,以对应输出一比较输出信号;
    其中,所述触控装置的一信号处理单元对所述比较单元的一比较输出信号进行信号处理,所述触控装置的一坐标计算单元根据所述信号处理单元的一输出信号,计算对应于触摸事件的触摸坐标;
    其中,当于一时间区间中所述接收信号的振幅皆小于所述阈值时,所述比较输出信号保留所述时间区间中的所述接收信号;
    其中,当所述接收信号于所述时间区间中具有大于所述阈值的振幅时,所述比较输出信号丢弃所述接收信号于一区段的接收信号;
    其中,所述区段包括所述时间区间中且于一时间点之前的时间区段,所述时间点对应所述接收信号的振幅大于所述阈值的时间点。
  2. 如权利要求1所述的噪声消除电路,其特征在于,当所述接收信号于所述时间区间中具有大于所述阈值的振幅时,所述比较输出信号丢弃所述接收信号于所述时间区间的接收信号。
  3. 如权利要求1所述的噪声消除电路,其特征在于,所述阈值单元包括:
    一比率单元,用来计算一第一比率,其中所述第一比率相关于所述接收信号于多个时间区间中被所述比较单元保留的时间区间的比率;以及
    一调整单元,用来根据所述第一比率,调整所述阈值;
    其中,当所述第一比率小于一最低比率值时,所述调整单元将所述阈值调高。
  4. 如权利要求3所述的噪声消除电路,其特征在于,当所述第一比率大于一最高比率值时,所述调整单元将所述阈值调低。
  5. 如权利要求3所述的噪声消除电路,其特征在于,所述第一比率为于所述多个时间区间中,所述坐标计算单元成功计算触摸坐标并呈报所述触摸坐标至所述触控装置的比率。
  6. 如权利要求3所述的噪声消除电路,其特征在于,所述阈值单元还包括:
    一噪声检测单元,用来对所述接收信号进行一噪声检测运算,以产生一检测结果;
    其中,该调整单元根据该检测结果,决定是否要调整该阈值;
    其中,该噪声检测运算将该接收信号中的噪声分离出一充电器噪声以及一显示屏噪声。
  7. 如权利要求6所述的噪声消除电路,其特征在于,当所述检测结果显示所述充电器噪声的振幅大于所述显示屏噪声的振幅时,该调整单元将该阈值调高。
  8. 如权利要求6所述的噪声消除电路,其特征在于,当所述显示屏噪声未具有脉冲噪声时,该调整单元将该阈值调高。
  9. 如权利要求1所述的噪声消除电路,其特征在于,当所述比较输出信号丢弃所述接收信号于该区段的接收信号时,于该区段中所述比较输出信号的值为0或固定电平。
  10. 一种触控装置,其特征在于,包括:
    一噪声消除电路,包括:
    一阈值单元,用来计算一阈值;以及
    一比较单元,耦接于所述触控装置的一接收电极以及所述阈值单元,以接收一接收信号以及所述阈值,所述比较单元用来比较所述接收信号与所述阈值,以对应输出一比较输出信号;
    一信号处理单元,耦接于所述比较单元,对所述比较单元的一比较输出信号进行信号处理,以产生一输出信号;以及
    一坐标计算单元,耦接于所述信号处理单元,用来根据所述输出信号,计算对应于触摸事件的坐标;
    其中,当于一时间区间中所述接收信号的振幅皆小于所述阈值时,所述比较输出信号保留所述时间区间中的所述接收信号;
    其中,当所述接收信号于所述时间区间中具有大于所述阈值的振幅时,所述比较输出信号丢弃将所述接收信号于一区段的接收信号;
    其中,所述区段包括所述时间区间中且于一时间点之前的时间区段,所述时间点对应所述接收信号的振幅大于所述阈值的时间点。
  11. 如权利要求10所述的触控装置,其特征在于,当所述接收信号于所述时间区间中具有大于所述阈值的振幅时,所述比较输出信号丢弃所述接收信号于所述时间区间的接收信号。
  12. 如权利要求10所述的触控装置,其特征在于,所述阈值单元包括:
    一比率单元,用来计算一第一比率,其中所述第一比率相关于所述接收信号于多个时间区间中被所述比较单元保留的时间区间的比率;以及
    一调整单元,用来根据所述第一比率,调整所述阈值;
    其中,当所述第一比率小于一最低比率值时,所述调整单元将所述阈值调高。
  13. 如权利要求12所述的触控装置,其特征在于,当所述第一比率大于一最高比率值时,所述调整单元将所述阈值调低。
  14. 如权利要求12所述的触控装置,其特征在于,所述第一比率为于所述多个时间区间中,所述坐标计算单元成功计算触摸坐标并呈报所述触摸坐标至所述触控装置的比率。
  15. 如权利要求12所述的触控装置,其特征在于,所述阈值单元还包括:
    一噪声检测单元,用来对所述接收信号进行一噪声检测运算,以产生一检测结果;
    其中,该调整单元根据该检测结果,决定是否要调整该阈值;
    其中,该噪声检测运算将该接收信号中的噪声分离出一充电器噪声以及一显示屏噪声。
  16. 如权利要求15所述的触控装置,其特征在于,当所述检测结果显示所述充电器噪声的振幅大于所述显示屏噪声的振幅时,该调整单元将该阈值调高。
  17. 如权利要求15所述的触控装置,其特征在于,当所述显示屏噪声未具有脉冲噪声时,该调整单元将该阈值调高。
  18. 如权利要求10所述的触控装置,其特征在于,当所述比较输出信号丢弃所述接收信号于该区段的接收信号时,于该区段中所述比较输出信号的值为0或固定电平。
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