CN103197810B - 触控面板扫描方法 - Google Patents

触控面板扫描方法 Download PDF

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CN103197810B
CN103197810B CN201210020998.2A CN201210020998A CN103197810B CN 103197810 B CN103197810 B CN 103197810B CN 201210020998 A CN201210020998 A CN 201210020998A CN 103197810 B CN103197810 B CN 103197810B
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CN103197810A (zh
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黄荣寿
吴珈穆
洪泽伦
陈顺益
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Elan Microelectronics Corp
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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
    • G06F3/0416Control or interface arrangements specially adapted for digitisers
    • G06F3/04166Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G06F3/041662Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving using alternate mutual and self-capacitive scanning
    • 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
    • G06F3/044Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • 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
    • G06F3/0416Control or interface arrangements specially adapted for digitisers
    • G06F3/0418Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04184Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • 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
    • G06F3/044Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04104Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger

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Abstract

本发明公开了一种触控面板扫描方法,系读取一自容式感应图框,计算该自容式感应图框中各感应线与其相邻感应线之间的感应值斜率,再判断已计算出的感应值斜率大于一斜率临界值时,即标记所对应的感应线,以对驱动已标记的该感应线进行互容式扫描,以取得一互容式感应图框;是故,此一互容式感应图框即不包含噪声感应点,自然滤除噪声干扰;再者,由于仅对部份被标记的应应线进行互容式扫描,而能有效提升互容式感应图框产生率。

Description

触控面板扫描方法
技术领域
本发明系关于一种触控面板扫描方法,尤指一种兼具抗噪声且可提升互容式感应图框产生率的触控面板扫描方法。
背景技术
电容式触控板面概包含有互容式扫描方式及自容式扫描方式二种,分别就互容式感应图框及自容式感应图框进行触碰物件的识别。
触碰物件的识别方式主要藉由触碰物件位置的感应电容值变化加以判断之,由于电容式触控面板是藉由行、列感应线路之间感应电容值的变化判断触碰物件所在,故易受电容式触控面板的周边环境噪声影响而降低识别准确度,常见的有AC噪声、LCM噪声等等。
请配合参阅图7A所示,系为一触控面板经自容式扫描后获得其中一轴向感应线X1~XN的感应信号波形,其包含有低感度触控信号Sstylus(如小笔径触控笔20触碰产生者)、噪声感应信号Snoise(如AC噪声11或LCM噪声12影响产生)及高感度触控信号Sfinger(如大笔径触控笔或手指30触碰产生者);再如图7B所示,系为该触控面板另经互容式扫描后,同样反应图7A的AC噪声及高、低感度触碰信号的互容式感应图框10。
由图7A可知,高感度触控信号Sfinger的电容感应值较低感度触控信号的感应值及噪声Sstylus造成的感应值为高,因此对于识别高感度触控信号Sfinger的触碰物件较为容易,通常设定一感应临界值dV1,超过该感应临界值dV1者即判断为触碰物件。然而,当以触控笔20对电容式触控面板进行触控时,触控笔20只能造成低感度触控信号Sstylus,其感应值并无法超过该感应临界值dV1,而无法识别出触控笔20的触碰物件;倘若将该感应临界值dV1予以调降至较低的感应临界值dV2,则噪声感应信号Snoise将会因较低感应临界值dV2设定而容易误判为触碰物件;是以,如何排除噪声干扰而正常判断出低感度触碰物件的问题确实有必要进一步提出有效地解决方案。
发明内容
有鉴于目前互容式感应图框受到噪声干扰,导致低感应物件误判率高,本发明主要目的系提供一种触控面板扫描方法,以排除噪声干扰。
欲达上述目的所使用的主要技术手段系令该触控面板互容式扫描方法包含有:
读取一自容式感应图框的各感应线所分别对应的感应值;
计算该自容式感应图框中各感应线与其相邻感应线之间的感应值斜率;
判断已计算出的感应值斜率是否大于一斜率临界值;该斜率临界值高于一噪声感应信号的感应值斜率;若是,即标记所对应的感应线;
驱动已标记的该感应线进行互容式扫描,以取得一互容式感应图框。
上述本发明系藉由设定一较噪声感应信号斜率为高的斜率临界值,令对应噪声感应信号的驱动线在互容式扫描前不会被标记,故于执行互容式扫描后获得的互容式感应图框即不包含噪声感应点;再者,由于不必对所有驱动线进行互容式扫描,而能有效提升互容式感应图框产生率。
附图说明
图1:系本发明触控面板扫描方法的第一较佳实施例的流程图。
图2:系本发明触控面板扫描方法的第二较佳实施例的流程图。
图3A:系一触控面板示意图。
图3B:系对应图3A进行自容式扫描后整合第一方向感应线的感应信号波形图。
图3C:系标记图3A驱动线的示意图。
图4:系本发明触控面板扫描方法产生的互容式感应图框。
图5:系本发明触控面板扫描方法的第三较佳实施例的部份流程图。
图6:系既有互容式扫描示意图。
图7A:系一电容式触控面板的感应信号波形。
图7B:系对应图7A的一互容式感应图框示意图。
具体实施方式
以下配合图式及本发明的较佳实施例,进一步阐述本发明为达成预定发明目的所采取的技术手段。
首先请参阅图1所示,系为本发明触控面板扫描方法第一较佳实施例的流程图,其中该互容式扫描方法系包含有:
读取一自容式感应图框S10;
计算该自容式感应图框中各感应线与其相邻感应线之间的感应值斜率S11;
判断已计算出的感应值斜率是否大于一斜率临界值;若是,即标记所对应的感应线S12;及
驱动已标记的该感应线进行互容式扫描,以取得一互容式感应图框S13。
请参阅图2所示,系为本发明触控面板扫描方法第二较佳实施例的流程图,其中该互容式扫描方法系包含有:
读取一自容式感应图框S10;
比对该自容式感应图框各感应线的感应值是否超过一感应临界值,若是,则标记该感应线S101;
计算该自容式感应图框中各感应线与其相邻感应线之间的感应值斜率S11;
判断已计算出的感应值斜率是否大于一斜率临界值;若是,即标记所对应的感应线S12;及
驱动已标记的该感应线进行互容式扫描,以取得一互容式感应图框S13。
请配合参阅图3A所示,系为一电容式触控面板1受到AC噪声11、LCM噪声12干扰,并同时有手指30及触控笔20触控的例示,经自容式扫描后获得一自容式感应图框,该自容式感应图框对应该电容式触控面板1的二轴向感应线X1~XN、Y1~YM包含有二轴向(以下分别简称第一轴向及第二轴向)感应线X1~XN、Y1~YM的感应信号;在此感应线符号标示系为一例示,而第一轴向及第二轴向感应线亦反向标示为Y1~YM、X1~XN,不限制本发明范围。
上述S10步骤系读取此电容式触控面板1的自容式感应图框,如图3B所示,至少取得该自容式感应图框的第一轴向感应线X1~XN的感应信号,而此一第一轴向感应线X1~XN的感应信号系包含有对应触控笔20的低感度触控信号Sstylus、对应AC噪声及LCM噪声的噪声感应信号Snoise及对应手指的高感度触控信号Sfinger
再由本发明S101步骤进一步比对第一轴向感应线X1~XN的各感应线的感应值是否超过该感应临界值dVTH,若是则将该感应线予以标记,以下谨进一步配合图3C说明之:图3C系揭示图3A触控面板进行互容式扫描时,其第一轴向感应线X1~XN及第二轴向感应线Y1~YM分别定义为驱动线SEX1~SEXN及接收线SR1~SRM,因此该第一轴向感应线X1~XN即对应驱动线SEX1~SEXN,而第二轴向感应线Y1~YN即对应驱动线SR1~SRM。如图3A例示,执行上述101步骤时,第一轴向感应线X7的感应值超过该感应临界值dVTH,因此标记对应该第一方向感应线X7的驱动线SEX7(如实线箭头线所示)。
之后,再执行本发明S11步骤,以计算第一轴向感应线X1~XN中各感应线与其相邻感应线之间的感应值斜率,也就是说计算二相邻感应线之间的感应值差值,并取此差值的绝对值后,再由S12步骤比对计算出的感应值斜率是否达到该斜率临界值。以图3A及3B例示来说,对应该低感度触控信号Sstylus的第一轴向感应线X2、X3、X4分别与其相邻感应线X3、X2/X4、X3的感应值斜率(差值的绝对值)已超过该斜率临界值,故第一轴向感应线X2、X3、X4对应的驱动线SEX2、SEX3、SEX4会被予以标记(如实线箭头线所示);又,对应高感度触控信号Sfinger第一轴向感应线X6、X8与其各别相邻感应线X5、X7、X9的感应值斜率(差值的绝对值)同样超过该斜率临界值,故所对应的驱动线SEX6、SEX8被加以标记(如实线箭头线所示);是以,就图3A例示经本发明S10、S101、S11、S12步骤后,即可确认对应低感度触控信号Sstylus及高感度触控信号Sfinger的驱动线SEX2、SEX3、SEX4、SEX6、SEX7、SEX8,并予以标记之。
尔后,再经本发明S13步骤对已标记的驱动线SEX2、SEX3、SEX4、SEX6、SEX7、SEX8进行互容式扫描,以获得如图4的互容式感应图框10;由于其中因AC噪声11干扰产生的噪声感应信号Snoise所对应的驱动线SEX1未被标记而不会被扫描,故对应该噪声感应信号的感应点即被过滤而不会出现在互容式感应图框10中。
然而,由于另一LCM噪声12所干扰的噪声感应信号恰位于高感度触控信号的感应线X7上,而会被扫描并读入该互容式感应图框10而成为一感应点。由于LCM噪声感应点102的感应值有可能高于或等于低感度触控物件的感应点的感应值,因此当此一互容式感应图框10为了能够识别出低感度触控物件的感应值的峰值120而调降感应临界值,以本例来说将其若设定为120,则会使得原本邻近高感度触控信号的感应群的LCM噪声感应点102(感应值为150)也会被视为一触碰物件的峰值,造成原本只有二个触碰物件而被误判为3个触碰物件。
是以,为进一步自该互容式感应图框中消除靠近高感度触控信号或低感度触控信号的噪声感应点102,可就该互容式感应图框10中进一步判断其所包含各触碰感应群的大小,也就是说依据触碰感应群不同大小,设定不同的高低感应临界值,愈大的触碰感应群对应愈大的感应临界值;是以,如图5所示,本发明可进一步于上述S13步骤后包含有:
预设复数不同感应点预设数量值及复数感应临界值,其中愈大的感应点预设数量值对应愈大的感应临界值S14;
将各触碰感应群的感应点数量与复数感应点预设数量值比对,以决定各触碰感应群的大小S15;
依各触碰感应群大小读取对应的感应临界值S16;及
判断各触碰感应群的各感应点的感应值超过对应的感应临界值时,令该感应点为峰值感应点S17。
配合图4产生的互容式感应图框10例子,其包含有手指及触控笔触碰的二组触碰感应群101a、101b,经由上述步骤判断,手指触碰的触碰感应群101a较大,故可对应一较高的感应临界值(如200),再将此一手指触碰感应群101a的各感应点的感应值比对该感应临界值,只有中间感应点的感应值(300)会超过此一感应临界值,而因LCM噪声而生的感应点102的感应值(150)将低于此一感应临界值,而不会被回报为一峰值感应点。至于触控笔触碰的触碰感应群101b包含较少的感应点,而被判断为较小的触碰感应群,故所对应的感应临界点较低(如120),而顺利的回报一峰值感应点;是以,本发明可避免不因只单设一感应临界点而无法识别出低感度触控笔的峰值感应点,均能顺利地识别出低感度物件如触控笔的位置。
再如图6所示,系为一般互容式扫描方法产生相互式感应图框的示意图,即以周期时间TD依序对各驱动线SEX1~SEXN输出刺激信号,再由全部的接收线SR1~SRM接收回传信号;因此,完成一张互容式感应图框的时间至少为TFRAME=A(N*TD)。再请配合参阅图3C,本发明经由图1或图2流程判断后,只需驱动其中六条驱动线SEX2、SEX3、SEX4、SEX6、SEX7、SEX8,故若以图3C为例,本发明互容式感应图框的产生时间只需要TFRAME=A(6*TD),其中A为各驱动线描扫次数;是以,本发明互容式扫描方法均能较一般互容式扫描方法产生感应图框的时间来得短,而提高感应图框产生率。
综上所述,本发明藉由设定一较噪声感应信号斜率为高的斜率临界值,识别出对应噪声感应信号的驱动线,并于执行互容式扫描时不驱动对应噪声感应信号的驱动线,故扫描后获得的互容式感应图框即不包含噪声感应点;再者,由于不必对所有驱动线进行互容式扫描,而能有效提升互容式感应图框产生率(framerate)。
以上所述仅是本发明的较佳实施例而已,并非对本发明做任何形式上的限制,虽然本发明已以较佳实施例揭露如上,然而并非用以限定本发明,任何熟悉本专业的技术人员,在不脱离本发明技术方案的范围内,当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例,但凡是未脱离本发明技术方案的内容,依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰,均仍属于本发明技术方案的范围内。

Claims (5)

1.一种触控面板扫描方法,其特征在于,包括:
读取一自容式感应图框的各感应线所分别对应的感应值;
计算该自容式感应图框中各感应线与其相邻感应线之间的一感应值斜率;其中该感应值斜率为二相邻感应线之间的感应值差值,并取此差值的绝对值作为该感应值斜率;
判断已计算出之感应值斜率是否大于一斜率临界值;该斜率临界值高于一噪声感应信号的感应值斜率;若是,即标记所对应的感应线;
驱动已标记的该感应线进行互容式扫描,以取得一互容式感应图框。
2.根据权利要求1所述的触控面板扫描方法,其特征在于,上述驱动已标记的该感应线进行互容式扫描步骤前进一步比对该自容式感应图框在各感应线的感应值是否超过一感应临界值,若是,则标记该感应线。
3.根据权利要求1或2所述的触控面板扫描方法,其特征在于,上述读取自容式感应图框步骤中系读取该自容式感应图框的第一轴向感应线,其中该第一轴向感应线系与互容式感应图框驱动线同轴向。
4.根据权利要求1或2所述的触控面板扫描方法,其特征在于,在上述驱动已标记的该感应线进行互容式扫描步骤后进一步包含有:
预设复数不同感应点预设数量值及复数感应临界值,其中愈大的感应点预设数量值对应愈大的感应临界值;
将各触碰感应群的感应点数量与复数感应点预设数量值比对,以决定各触碰感应群的大小;
依各触碰感应群大小读取对应的感应临界值;
判断各触碰感应群的各感应点的感应值超过对应的感应临界值时,令该感应点为峰值感应点。
5.根据权利要求3所述的触控面板扫描方法,其特征在于,在上述驱动已标记的该感应线进行互容式扫描步骤之后进一步包含有:
预设复数不同感应点预设数量值及对应复数感应点预设数量值的复数感应临界值;
将各触碰感应群的感应点数量与复数感应点预设数量值比对,以决定各触碰感应群的大小;
依各触碰感应群大小读取对应的感应临界值;
判断各触碰感应群的各感应点的感应值超过对应的感应临界值时,令该感应点为峰值感应点。
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