WO2014101554A1 - 一种电容式触摸屏的触摸检测方法及系统 - Google Patents

一种电容式触摸屏的触摸检测方法及系统 Download PDF

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Publication number
WO2014101554A1
WO2014101554A1 PCT/CN2013/085829 CN2013085829W WO2014101554A1 WO 2014101554 A1 WO2014101554 A1 WO 2014101554A1 CN 2013085829 W CN2013085829 W CN 2013085829W WO 2014101554 A1 WO2014101554 A1 WO 2014101554A1
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signal
comparator
touch screen
energy value
cancellation
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PCT/CN2013/085829
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English (en)
French (fr)
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石钱松
冉锐
郁新华
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深圳市汇顶科技股份有限公司
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Publication of WO2014101554A1 publication Critical patent/WO2014101554A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Definitions

  • the invention belongs to the technical field of touch screen detection, and in particular relates to a touch detection method and system for a capacitive touch screen.
  • a touch sensor of a typical capacitive touch screen includes a longitudinal driving electrode TX and a lateral detecting electrode RX formed on a transparent conductive film of the touch panel, and a place where the driving electrode TX and the detecting electrode RX intersect Forming a capacitor; a comparator A placed on the output path of each detecting electrode RX, a non-inverting input terminal of the comparator A is connected to the detecting electrode RX, an inverting input terminal of the comparator A is connected to a canceling signal, and an output terminal of the comparator A is connected Other processing circuits.
  • touching the touch panel with a finger may affect the coupling between the driving electrode TX and the detecting electrode RX near the touch point, thereby changing the capacitance of the capacitor, and calculating the coordinates of the touch point according to the amount of change in the capacitance.
  • an excitation signal is sequentially sent to each row of the driving electrodes TX, and the detecting electrode RX simultaneously receives the signal, and the signal RX input from the non-inverting terminal of the comparator A is the actual detection signal, and the comparator A is inverted.
  • the signal Vref inputted by the terminal is a cancellation signal
  • the signal signal outputted by the output of the comparator A is the final detection signal.
  • the touch sensor of the capacitive touch screen is generally fixed due to the cancellation signal Vref, and cannot be dynamically adjusted according to the actual detection signal RX, so that the cancelled signal still contains a large amount of useless signals, resulting in accurate detection. Degree and impedance adaptability are low.
  • the object of the present invention is to provide a touch detection method and system for a capacitive touch screen, which aims to solve the problem that the offset signal cannot be dynamically adjusted according to the actual detection signal in the touch sensor of the conventional capacitive touch screen, resulting in detection accuracy and impedance.
  • the present invention is implemented as a touch detection method for a capacitive touch screen, the method comprising:
  • the first driving signal is sent to the driving electrode of the touch screen sensor, and the inverse of the input of the comparator is dynamically adjusted according to the energy value outputted by the inverting end of the comparator in the touch screen sensor. a cancellation signal of the phase end, obtaining a first detection signal received by the detection electrode of the touch screen sensor;
  • a second driving signal is sent to the driving electrode, and the dynamically adjusted cancellation signal is output to the inverting end of the comparator to obtain the detecting electrode.
  • Touch information is obtained by using a difference between an energy value of the first detection signal and an energy value of the second detection signal.
  • the embodiment of the invention further provides a touch detection system for a capacitive touch screen, the system comprising:
  • a first obtaining unit configured to: when the touch panel of the capacitive touch screen is not triggered, send a first driving signal to the driving electrode of the touch screen sensor, and dynamically adjust the input according to the energy value output by the comparator in the touch screen sensor a canceling signal at an inverting end of the comparator, to obtain a first detecting signal received by the detecting electrode of the touch screen sensor;
  • a second acquiring unit configured to send a second driving signal to the driving electrode when the touch panel of the capacitive touch screen is triggered, and output the dynamics of the first acquiring unit to an inverting end of the comparator Adjusting the canceled signal to obtain a second detection signal received by the detecting electrode;
  • a third acquiring unit configured to obtain touch information by using a difference between an energy value of the first detection signal and an energy value of the second detection signal.
  • the touch detection method and system of the capacitive touch screen provided by the present invention dynamically adjusts the cancellation signal input to the inverting end of the comparator by using the energy value outputted by the comparator in the touch screen sensor, and obtains the first detection signal when the touch panel is not triggered.
  • the second detection signal at the time of triggering uses the energy difference between the first detection signal and the second detection signal to obtain touch information.
  • the offset signal can be dynamically adjusted according to the difference of the detection signals input to the non-inverting terminal of the comparator, and the useless signal in the canceled signal is reduced, thereby improving the accuracy of the touch detection.
  • FIG. 1 is a typical structural diagram of a touch sensor of a capacitive touch screen provided by the prior art
  • FIG. 2 is a flow chart of a touch detection method of a capacitive touch screen provided by the present invention
  • Figure 3 is a flow chart showing the first detection signal in the present invention.
  • FIG. 4 is a structural diagram of a touch detection system of a capacitive touch screen provided by the present invention.
  • FIG. 5 is a structural diagram of the first acquisition unit of FIG. 4.
  • the present invention proposes a touch detection method for a capacitive touch screen, which uses the offset signal to participate in cancellation and the difference in energy values respectively output by the comparators when not participating in the cancellation, and the offset signal participates in canceling
  • the cancellation signal is adjusted to obtain a first detection signal when the touch panel is not triggered and a second detection signal when the touch panel is triggered, and the energy difference between the first detection signal and the second detection signal is used to obtain Touch the message.
  • FIG. 2 shows a flow of a touch detection method of a capacitive touch screen provided by the present invention.
  • the touch detection method of the capacitive touch screen includes:
  • Step S1 when the touch panel of the capacitive touch screen is not triggered, send a first driving signal to the driving electrode of the touch screen sensor, and dynamically adjust the offset signal of the inverting end of the input comparator according to the energy value output by the comparator in the touch screen sensor. Obtaining a first detection signal received by the detection electrode of the touch screen sensor. Further, as shown in FIG. 3, step S1 may include:
  • Step S101 Send a first driving signal to the driving electrode.
  • Step S102 output a fixed level to the inverting terminal of the comparator.
  • Step S103 Acquire a first energy value output by the comparator.
  • Step S104 Control the detection electrode to be turned on by a fixed level.
  • Step S105 Outputting a cancellation signal participating in the cancellation to the inverting terminal of the comparator.
  • the initial signal of the cancellation signal participating in the cancellation may be a signal in the following cases: the final detection signal of the comparator output on the channel where the cancellation signal is located; and the cancellation signal input to the inverting terminal of the corresponding comparator on the other channel;
  • the cancellation signal of the corresponding comparator inverting terminal is input on the adjacent channel of the channel where the cancellation signal is located; the driving signal on the driving electrode corresponding to the channel where the signal is located is cancelled.
  • the frequency of the cancellation signal is equal to the frequency of the first drive signal.
  • Step S106 Acquire a second energy value output by the comparator.
  • Step S107 It is determined whether the absolute value of the difference between the first energy value and the second energy value is less than the first threshold. If yes, step 109 is performed, otherwise step 108 is performed.
  • Step S108 Adjust the amplitude of the cancellation signal, and then return to step S105.
  • Step S109 The amplitude of the cancellation signal is taken as the amplitude of the first detection signal.
  • Step S110 determining whether the second energy value is less than the second threshold, if yes, executing step S112, otherwise performing step S111.
  • Step S111 Adjust the phase angle of the cancellation signal, and then return to step S105.
  • Step S112 The phase angle of the cancellation signal is taken as the phase angle of the first detection signal.
  • the first driving signal TX1 sent to the driving electrode is set to A•sin( ⁇ t), and the first detection signal received by the corresponding detecting electrode is set to Ax•sin ( ⁇ t+ ⁇ ), in order to achieve the cancellation process, the amplitude Ax and the phase angle ⁇ of the first detection signal must be obtained.
  • the first energy value is W1
  • the cancellation signal is offset1
  • the amplitude of the cancellation signal is offset1 is Ay
  • the phase angle of the cancellation signal offset1 is ⁇ 1
  • the second energy value is W2
  • the first threshold is threshold1
  • the second threshold is Threshold2
  • firstly when the first driving signal TX1 is issued and the inverting end of the comparator is at a fixed level without participating in cancellation, the first energy value W1 is obtained; after that, the detecting electrode is set to a fixed level, and the comparator
  • the inverting end of the offset signal offset1 participating in the cancellation acquires the second energy value W2 at this time; after that,
  • the angle ⁇ 1, and the adjusted cancellation signal offset1 is re-inputted into the inverting end of the comparator. If the second energy value W2 is smaller than the second threshold threshold2, the phase angle ⁇ 1 of the cancellation signal offset1 is taken as the phase angle of the first detection signal. Thereby, the amplitude Ax and the phase angle ⁇ of the first detection signal are obtained.
  • Step S2 when the touch panel of the capacitive touch screen is triggered, send a second driving signal to the driving electrode, and output the canceling signal dynamically adjusted in step S1 to the inverting end of the comparator to obtain the second received by the detecting electrode. Detection signal.
  • Step S3 Using the difference between the energy value of the first detection signal and the energy value of the second detection signal, the touch information is obtained, and the touch information represents the position of the touch point on the touch panel.
  • the touch signal is then output to the touch screen controller, and the touch screen controller converts the touch information into touch coordinates to perform the corresponding function.
  • FIG. 4 shows the structure of a touch detection system of a capacitive touch screen provided by the present invention, and only parts related to the present invention are shown for convenience of explanation.
  • the touch detection system of the capacitive touch screen includes: a first acquisition unit 1 configured to send a first driving signal to a driving electrode of the touch screen sensor when the touch panel of the capacitive touch screen is not triggered, and The first detection signal received by the detection electrode of the touch screen sensor is dynamically adjusted according to the energy value of the comparator output in the touch screen sensor, and the second acquisition unit 2 is used in the capacitive touch screen.
  • the obtaining unit 3 is configured to obtain the touch information by using a difference between the energy value of the first detection signal obtained by the first acquiring unit 1 and the energy value of the second detection signal obtained by the second acquiring unit 2.
  • Fig. 5 shows the structure of the first acquisition unit 1 of Fig. 4.
  • the first obtaining unit 1 may include: a first driving module 101, configured to send a first driving signal to the driving electrode; and a first output module 102, configured to output a fixed level to the inverting end of the comparator; An obtaining module 103, configured to acquire a first energy value output by the comparator; a first control module 104, configured to control the detecting electrode to be turned on by a fixed level; and a second output module 105, configured to perform an inverting end of the comparator Outputting a cancellation signal that participates in the cancellation; the second acquisition module 106 is configured to obtain a second energy value output by the comparator; the first determining module 107 is configured to determine whether an absolute value of the difference between the first energy value and the second energy value is The first adjustment module 108 is configured to: when the first determining module 107 determines that the absolute value of the difference between the first energy value and the second energy value is not less than the first threshold, adjust the amplitude of the cancellation signal, The second output module 105 outputs the adjusted cancellation
  • the second output module 105 When determining whether the second energy value is not less than the second threshold, adjusting the phase angle of the cancellation signal, the second output module 105 outputs the adjusted cancellation signal to the inverting end of the comparator; the second evaluation module 112 is configured to be used as When the second determining module 110 determines that the second energy value is less than the second threshold, the phase angle of the cancellation signal is used as the phase angle of the first detection signal.
  • the initial signal of the cancellation signal that the second output module 105 outputs to the inverting terminal of the comparator and participates in the cancellation may be the signal in the following cases; the final detection of the comparator output on the channel where the cancellation signal is located Signal; the cancellation signal of the corresponding comparator inverting terminal is input on the other channel; the cancellation signal of the corresponding comparator inverting terminal is input on the adjacent channel of the channel where the cancellation signal is located; and the driving signal on the driving electrode corresponding to the channel where the signal is located is cancelled.
  • the frequency of the cancellation signal is equal to the frequency of the first drive signal.
  • the touch detection method and system of the capacitive touch screen provided by the present invention dynamically adjusts the cancellation signal input to the inverting end of the comparator by using the energy value outputted by the comparator in the touch screen sensor, and obtains the first detection signal when the touch panel is not triggered.
  • the second detection signal at the time of triggering uses the energy difference between the first detection signal and the second detection signal to obtain touch information.
  • the offset signal can be dynamically adjusted according to the difference of the detection signals input to the non-inverting terminal of the comparator, and the useless signal in the canceled signal is reduced, thereby improving the accuracy of the touch detection.

Abstract

本发明属于触摸屏检测技术领域，提供了一种电容式触摸屏的触摸检测方法及系统。该方法及系统利用触摸屏传感器中比较器输出的能量值，动态调整输入到比较器反相端的抵消信号，得到触摸面板未被触发时的第一检测信号和被触发时的第二检测信号，利用第一检测信号和第二检测信号的能量差值，得到触摸信息。可实现抵消信号随输入到比较器同相端的检测信号的不同而动态的调整，降低了抵消后的信号中的无用信号，进而提高了触摸检测的精准度、阻抗适应性指标。

Description

一种电容式触摸屏的触摸检测方法及系统 技术领域
本发明属于触摸屏检测技术领域，尤其涉及一种电容式触摸屏的触摸检测方法及系统。
背景技术
公知地，如图1所示，典型的电容式触摸屏的触摸传感器包括：在触摸面板的透明导电薄膜上制作的纵向驱动电极TX和横向检测电极RX，驱动电极TX和检测电极RX交叉的地方会形成电容；放置在每一检测电极RX输出通路上的比较器A，比较器A的同相输入端连接检测电极RX，比较器A的反相输入端连接一抵消信号，比较器A的输出端连接其它处理电路。
在进行触摸位置检测时，手指触摸触摸面板会影响触摸点附近驱动电极TX和检测电极RX之间的耦合，从而改变电容的电容量，依据电容量的变化量，即可计算出触摸点的坐标。具体而言，在检测电容大小时，依次向每一排驱动电极TX发出激励信号，检测电极RX同时接收信号，比较器A的同相端输入的信号RX为实际检测信号，比较器A的反相端输入的信号Vref为抵消信号，比较器A的输出端输出的信号signal为最终检测信号，其它处理电路对最终检测信号进行处理后，即可得到触摸面板上所有交叉点处、电容的电容值大小。在此过程中，可以认为，最终检测信号signal的能量强度=实际检测信号RX-抵消信号Vref。
然而，在现有技术中，电容式触摸屏的触摸传感器由于抵消信号Vref一般是固定不变的，不能根据实际检测信号RX而动态调整，使得抵消后的信号仍旧含有大量无用的信号，导致检测精准度、阻抗适应能力较低。
 技术问题
本发明的目的在于提供一种电容式触摸屏的触摸检测方法及系统，旨在解决现有的电容式触摸屏的触摸传感器中，由于抵消信号不能根据实际检测信号而动态调整，导致检测精准度、阻抗适应能力较低的问题。
 技术解决方案
本发明是这样实现的，一种电容式触摸屏的触摸检测方法，所述方法包括：
在电容式触摸屏的触摸面板未被触发时，向触摸屏传感器的驱动电极发出第一驱动信号，并根据所述触摸屏传感器中比较器反相端输出的能量值，动态调整输入所述比较器的反相端的抵消信号，得到所述触摸屏传感器的检测电极接收到的第一检测信号；
在电容式触摸屏的所述触摸面板被触发时，向所述驱动电极发出第二驱动信号，并向所述比较器的反相端输出经动态调整后的所述抵消信号，得到所述检测电极接收到的第二检测信号；
利用所述第一检测信号的能量值与所述第二检测信号的能量值的差值，得到触摸信息。
本发明实施例还提供一种电容式触摸屏的触摸检测系统，所述系统包括：
第一获取单元，用于在电容式触摸屏的触摸面板未被触发时，向触摸屏传感器的驱动电极发出第一驱动信号，并根据所述触摸屏传感器中比较器输出的能量值，动态调整输入所述比较器的反相端的抵消信号，得到所述触摸屏传感器的检测电极接收到的第一检测信号；
第二获取单元，用于在电容式触摸屏的所述触摸面板被触发时，向所述驱动电极发出第二驱动信号，并向所述比较器的反相端输出经所述第一获取单元动态调整后的所述抵消信号，得到所述检测电极接收到的第二检测信号；
第三获取单元，用于利用所述第一检测信号的能量值与所述第二检测信号的能量值的差值，得到触摸信息。
 有益效果
本发明提供的电容式触摸屏的触摸检测方法及系统利用触摸屏传感器中比较器输出的能量值，动态调整输入到比较器反相端的抵消信号，得到触摸面板未被触发时的第一检测信号和被触发时的第二检测信号，利用第一检测信号和第二检测信号的能量差值，得到触摸信息。可实现抵消信号随输入到比较器同相端的检测信号的不同而动态的调整，降低了抵消后的信号中的无用信号，进而提高了触摸检测的精准度。
附图说明
图1是现有技术提供的电容式触摸屏的触摸传感器的典型结构图；
图2是本发明提供的电容式触摸屏的触摸检测方法的流程图；
图3是本发明中，得到第一检测信号的流程图；
图4是本发明提供的电容式触摸屏的触摸检测系统的结构图；
图5是图4中第一获取单元的结构图。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明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发明，并不用于限定本发明。
针对现有技术存在的问题，本发明提出了一种电容式触摸屏的触摸检测方法，该方法利用抵消信号参与抵消以及未参与抵消时比较器分别输出的能量值的差值、以及抵消信号参与抵消时比较器输出的能量值，调整抵消信号，得到触摸面板未被触发时的第一检测信号和被触发时的第二检测信号，利用第一检测信号和第二检测信号的能量差值，得到触摸信息。
图2示出了本发明提供的电容式触摸屏的触摸检测方法的流程。
详细而言，本发明提供的电容式触摸屏的触摸检测方法包括：
步骤S1：在电容式触摸屏的触摸面板未被触发时，向触摸屏传感器的驱动电极发出第一驱动信号，并根据触摸屏传感器中比较器输出的能量值，动态调整输入比较器的反相端的抵消信号，得到触摸屏传感器的检测电极接收到的第一检测信号。进一步地，如图3所示，步骤S1可以包括：
步骤S101：向驱动电极发出第一驱动信号。
步骤S102：向比较器的反相端输出一固定电平。
步骤S103：获取比较器输出的第一能量值。
步骤S104：控制检测电极接通一固定电平。
步骤S105：向比较器的反相端输出参与抵消的抵消信号。
本发明中，参与抵消的抵消信号的初始信号可以是下述几种情况中的信号：抵消信号所在通道上的比较器输出的最终检测信号；其它通道上输入相应比较器反相端的抵消信号；抵消信号所在通道的相邻通道上输入相应比较器反相端的抵消信号；抵消信号所在通道对应的驱动电极上的驱动信号。同时，抵消信号的频率与第一驱动信号的频率相等。
步骤S106：获取比较器输出的第二能量值。
步骤S107：判断第一能量值与第二能量值的差值的绝对值是否小于第一阈值，是则执行步骤109，否则执行步骤108。
步骤S108：调整抵消信号的幅值，之后返回步骤S105。
步骤S109：将抵消信号的幅值作为第一检测信号的幅值。
步骤S110：判断第二能量值是否小于第二阈值，是则执行步骤S112，否则执行步骤S111。
步骤S111：调整抵消信号的相角，之后返回步骤S105。
步骤S112：将抵消信号的相角作为第一检测信号的相角。
例如，假设在电容式触摸屏的触摸面板未被触发时，向驱动电极发出的第一驱动信号TX1设为A•sin(ωt)，相应检测电极接收到的第一检测信号设为Ax•sin(ωt+ψ)，则为了实现抵消处理，则须求得第一检测信号的幅值Ax和相角ψ。假设第一能量值为W1、抵消信号为offset1、抵消信号为offset1的幅值为为Ay、抵消信号offset1的相角为ψ1、第二能量值为W2、第一阈值为threshold1、第二阈值为threshold2，则首先在发出第一驱动信号TX1、比较器的反相端为一固定电平而不参与抵消时，获取第一能量值W1；之后，将检测电极置为一固定电平，比较器的反相端为参与抵消的抵消信号offset1，获取此时的第二能量值W2；之后，计算|W1- W2|，若|W1- W2|大于或等于第一阈值threshold1，则调整抵消信号offset1的幅值Ay，并将调整后的抵消信号offset1重新输入比较器的反相端，若|W1- W2|小于第一阈值threshold1，则将抵消信号offset1的幅值Ay作为第一检测信号的幅值Ax；之后，若第二能量值W2大于或等于第二阈值threshold2，则调整抵消信号offset1的相角ψ1，并将调整后的抵消信号offset1重新输入比较器的反相端，若第二能量值W2小于第二阈值threshold2，则将抵消信号offset1的相角ψ1作为第一检测信号的相角ψ，从而得到了第一检测信号的幅值Ax和相角ψ。
步骤S2：在电容式触摸屏的触摸面板被触发时，向驱动电极发出第二驱动信号，并向比较器的反相端输出经步骤S1动态调整后的抵消信号，得到检测电极接收到的第二检测信号。
步骤S3：利用第一检测信号的能量值与第二检测信号的能量值的差值，得到触摸信息，该触摸信息表征了触摸面板上触摸点的位置。该触摸信号之后会被输出到触摸屏控制器，由触摸屏控制器将触摸信息转换成触摸坐标，以执行相应功能。
图4示出了本发明提供的电容式触摸屏的触摸检测系统的结构，为了便于说明，仅示出了与本发明相关的部分。
详细而言，本发明提供的电容式触摸屏的触摸检测系统包括：第一获取单元1，用于在电容式触摸屏的触摸面板未被触发时，向触摸屏传感器的驱动电极发出第一驱动信号，并根据触摸屏传感器中比较器输出的能量值，动态调整输入比较器的反相端的抵消信号，得到触摸屏传感器的检测电极接收到的第一检测信号；第二获取单元2，用于在电容式触摸屏的触摸面板被触发时，向驱动电极发出第二驱动信号，并向比较器的反相端输出经第一获取单元1动态调整后的抵消信号，得到检测电极接收到的第二检测信号；第三获取单元3，用于利用第一获取单元1得到的第一检测信号的能量值与第二获取单元2得到的第二检测信号的能量值的差值，得到触摸信息。
图5示出了图4中第一获取单元1的结构。
具体地，第一获取单元1可以包括：第一驱动模块101，用于向驱动电极发出第一驱动信号；第一输出模块102，用于向比较器的反相端输出一固定电平；第一获取模块103，用于获取比较器输出的第一能量值；第一控制模块104，用于控制检测电极接通一固定电平；第二输出模块105，用于向比较器的反相端输出参与抵消的抵消信号；第二获取模块106，用于获取比较器输出的第二能量值；第一判断模块107，用于判断第一能量值与第二能量值的差值的绝对值是否小于第一阈值；第一调整模块108，用于当第一判断模块107判断第一能量值与第二能量值的差值的绝对值不小于第一阈值时，调整抵消信号的幅值，由第二输出模块105向比较器的反相端输出调整后的抵消信号；第一赋值模块109，用于当第一判断模块107判断第一能量值与第二能量值的差值的绝对值小于第一阈值时，将抵消信号的幅值作为第一检测信号的幅值；第二判断模块110，用于判断第二能量值是否小于第二阈值；第二调整模块111，用于当第二判断模块110判断第二能量值是否不小于第二阈值时，调整抵消信号的相角，由第二输出模块105向比较器的反相端输出调整后的抵消信号；第二赋值模块112，用于当第二判断模块110判断第二能量值小于第二阈值时，将抵消信号的相角作为第一检测信号的相角。
本发明中，第二输出模块105向比较器的反相端输出的、参与抵消的抵消信号的初始信号可以是下述几种情况中的信号；抵消信号所在通道上的比较器输出的最终检测信号；其它通道上输入相应比较器反相端的抵消信号；抵消信号所在通道的相邻通道上输入相应比较器反相端的抵消信号；抵消信号所在通道对应的驱动电极上的驱动信号。同时，抵消信号的频率与第一驱动信号的频率相等。
本发明提供的电容式触摸屏的触摸检测方法及系统利用触摸屏传感器中比较器输出的能量值，动态调整输入到比较器反相端的抵消信号，得到触摸面板未被触发时的第一检测信号和被触发时的第二检测信号，利用第一检测信号和第二检测信号的能量差值，得到触摸信息。可实现抵消信号随输入到比较器同相端的检测信号的不同而动态的调整，降低了抵消后的信号中的无用信号，进而提高了触摸检测的精准度。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通过程序来控制相关的硬件完成，所述的程序可以在存储于一计算机可读取存储介质中，所述的存储介质，如ROM/RAM、磁盘、光盘等。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (6)

  1. 一种电容式触摸屏的触摸检测方法，其特征在于，所述方法包括：
    在电容式触摸屏的触摸面板未被触发时，向触摸屏传感器的驱动电极发出第一驱动信号，并根据所述触摸屏传感器中比较器输出的能量值，动态调整输入所述比较器的反相端的抵消信号，得到所述触摸屏传感器的检测电极接收到的第一检测信号；
    在电容式触摸屏的所述触摸面板被触发时，向所述驱动电极发出第二驱动信号，并向所述比较器的反相端输出经动态调整后的所述抵消信号，得到所述检测电极接收到的第二检测信号；
    利用所述第一检测信号的能量值与所述第二检测信号的能量值的差值，得到触摸信息。
  2. 如权利要求1所述的电容式触摸屏的触摸检测方法，其特征在于，所述在电容式触摸屏的触摸面板未被触发时，向触摸屏传感器的驱动电极发出第一驱动信号，并根据所述触摸屏传感器中比较器输出的能量值，动态调整输入所述比较器的反相端的抵消信号，得到所述触摸屏传感器的检测电极接收到的第一检测信号的步骤包括：
    向所述驱动电极发出第一驱动信号；
    向所述比较器的反相端输出一固定电平；
    获取所述比较器输出的第一能量值；
    控制所述检测电极接通一固定电平；
    向所述比较器的反相端输出参与抵消的抵消信号；
    获取所述比较器输出的第二能量值；
    判断所述第一能量值与所述第二能量值的差值的绝对值是否小于第一阈值，是则将所述抵消信号的幅值作为所述第一检测信号的幅值，否则调整所述抵消信号的幅值，之后返回所述向所述比较器的反相端输出参与抵消的抵消信号的步骤；
    判断所述第二能量值是否小于第二阈值，是则将所述抵消信号的相角作为所述第一检测信号的相角，否则调整所述抵消信号的相角，之后返回所述向所述比较器的反相端输出参与抵消的抵消信号的步骤。
  3. 如权利要求2所述的电容式触摸屏的触摸检测方法，其特征在于，所述抵消信号的频率与所述第一驱动信号的频率相等，其初始信号为下述几种情况中的信号：
    所述抵消信号所在通道上的所述比较器输出的最终检测信号；
    其它通道上输入相应比较器反相端的抵消信号；
    所述抵消信号所在通道的相邻通道上输入相应比较器反相端的抵消信号；
    所述抵消信号所在通道对应的所述驱动电极上的驱动信号。
  4. 一种电容式触摸屏的触摸检测系统，其特征在于，所述系统包括：
    第一获取单元，用于在电容式触摸屏的触摸面板未被触发时，向触摸屏传感器的驱动电极发出第一驱动信号，并根据所述触摸屏传感器中比较器输出的能量值，动态调整输入所述比较器的反相端的抵消信号，得到所述触摸屏传感器的检测电极接收到的第一检测信号；
    第二获取单元，用于在电容式触摸屏的所述触摸面板被触发时，向所述驱动电极发出第二驱动信号，并向所述比较器的反相端输出经所述第一获取单元动态调整后的所述抵消信号，得到所述检测电极接收到的第二检测信号；
    第三获取单元，用于利用所述第一检测信号的能量值与所述第二检测信号的能量值的差值，得到触摸信息。
  5. 如权利要求4所述的电容式触摸屏的触摸检测系统，其特征在于，所述第一获取单元包括：
    第一驱动模块，用于向所述驱动电极发出第一驱动信号；
    第一输出模块，用于向所述比较器的反相端输出一固定电平；
    第一获取模块，用于获取所述比较器输出的第一能量值；
    第一控制模块，用于控制所述检测电极接通一固定电平；
    第二输出模块，用于向所述比较器的反相端输出参与抵消的抵消信号；
    第二获取模块，用于获取所述比较器输出的第二能量值；
    第一判断模块，用于判断所述第一能量值与所述第二能量值的差值的绝对值是否小于第一阈值；
    第一调整模块，用于当所述第一判断模块判断所述第一能量值与所述第二能量值的差值的绝对值不小于所述第一阈值时，调整所述抵消信号的幅值，由所述第二输出模块向所述比较器的反相端输出调整后的所述抵消信号；
    第一赋值模块，用于当所述第一判断模块判断所述第一能量值与所述第二能量值的差值的绝对值小于所述第一阈值时，将所述抵消信号的幅值作为所述第一检测信号的幅值；
    第二判断模块，用于判断所述第二能量值是否小于第二阈值；
    第二调整模块，用于当所述第二判断模块判断所述第二能量值是否不小于所述第二阈值时，调整所述抵消信号的相角，由所述第二输出模块向所述比较器的反相端输出调整后的所述抵消信号；
    第二赋值模块，用于当所述第二判断模块判断所述第二能量值小于所述第二阈值时，将所述抵消信号的相角作为所述第一检测信号的相角。
  6. 如权利要求5所述的电容式触摸屏的触摸检测系统，其特征在于，所述第二输出模块向所述比较器的反相端输出的、所述抵消信号的频率与所述第一驱动信号的频率相等，其初始信号为下述几种情况中的信号：
    所述抵消信号所在通道上的所述比较器输出的最终检测信号；
    其它通道上输入相应比较器反相端的抵消信号；
    所述抵消信号所在通道的相邻通道上输入相应比较器反相端的抵消信号；
    所述抵消信号所在通道对应的所述驱动电极上的驱动信号。
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