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    • 1. 发明授权
    • Adaptive frequency touchscreen controller
    • 自适应频率触摸屏控制器
    • US06630929B1
    • 2003-10-07
    • US09408594
    • 1999-09-29
    • Robert AdlerJoel KentJeffrey L. SharpGeoffrey D. Wilson
    • Robert AdlerJoel KentJeffrey L. SharpGeoffrey D. Wilson
    • G09G500
    • G06F3/0436
    • A method and apparatus for adapting an acoustic touchscreen controller to the operating frequency requirements of a specific touchscreen are provided. The adaptive controller can either utilize look-up tables to achieve the desired output frequency or the it can use a multi-step process in which it first determines the frequency requirements of the touchscreen, and then adjusts the burst frequency characteristics, the receiver circuit center frequency, or both in accordance with the touchscreen requirements. In one embodiment, the adaptive controller compensates for global frequency mismatch errors. In this embodiment a digital multiplier is used to modify the output of a crystal reference oscillator. The reference oscillator output is used to control the frequency of the signal from the receiving transducers and/or to generate the desired frequency of the tone burst sent to the transmitting transducers. In another embodiment that is intended to compensate for both global and local frequency variations, the adaptive controller uses a digital signal processor. The digital signal processor, based on correction values contained in memory, defines a specific center frequency which preferably varies according to the signal delay, thus taking into account variations caused by localized variations in the acoustic wave reflective array. In yet another embodiment, a non-crystal local oscillator is used to provide the reference signal in the adaptive controller. The use of such an oscillator allows the controller to be miniaturized to a sufficient extent that it can be mounted directly to a touchscreen substrate. A feedback loop is used to compensate for oscillator drift. A discriminator circuit determines the degree of deviation from the desired frequency. The output from the discriminator is used to adjust the frequency of the local oscillator such that it tracks the frequency of the touchscreen.
    • 提供了一种用于使声学触摸屏控制器适应特定触摸屏的操作频率要求的方法和装置。 自适应控制器可以使用查找表来实现期望的输出频率,或者可以使用多步骤过程,其中它首先确定触摸屏的频率要求,然后调整突发频率特性,接收器电路中心 频率或两者均符合触屏要求。 在一个实施例中,自适应控制器补偿全局频率失配误差。 在本实施例中,使用数字乘法器来修改晶体参考振荡器的输出。 参考振荡器输出用于控制来自接收换能器的信号的频率和/或产生发送到发射换能器的音调脉冲串的期望频率。 在旨在补偿全局和局部频率变化的另一实施例中,自适应控制器使用数字信号处理器。 数字信号处理器基于存储器中包含的校正值来定义特定的中心频率,其优选地根据信号延迟而变化,因此考虑到由声波反射阵列中的局部变化引起的变化。 在又一个实施例中,使用非晶体本地振荡器来在自适应控制器中提供参考信号。 使用这种振荡器允许控制器被小型化到足以使其可以直接安装到触摸屏基板上。 反馈回路用于补偿振荡器漂移。 鉴频器电路确定与期望频率的偏差程度。 来自鉴别器的输出用于调整本地振荡器的频率,以便跟踪触摸屏的频率。
    • 2. 发明授权
    • Touch confirming touchscreen utilizing plural touch sensors
    • 使用多个触摸传感器触摸确认触摸屏
    • US06504530B1
    • 2003-01-07
    • US09390207
    • 1999-09-07
    • Geoffrey D. WilsonVictor E. BorgnisJoel KentMike LewisDrew LoucksJames RoneyMichael Bruno Patti
    • Geoffrey D. WilsonVictor E. BorgnisJoel KentMike LewisDrew LoucksJames RoneyMichael Bruno Patti
    • G09G500
    • G06F3/0418
    • A method and apparatus for discriminating against false touches in a touchscreen system is provided. The system is designed to confirm a touch registered by one touch sensor with another touch sensor, preferably of a different sensor type, prior to acting upon the touch (i.e., sending touch coordinates to the operating system). If the touch registered by the first touch sensor is not confirmed by the second touch sensor, the touch is invalidated. Thus the strengths of one type of sensor are used to overcome the deficiencies of another type of sensor. In one aspect, the secondary touch sensor comprises a force sensor to discriminate between true and false touches on other types of touch sensors, such as contaminants on optical and surface acoustic wave sensors, noise or weak signals on capacitive sensors, etc. The force sensor may be a simple one-element system that merely indicates that a touch has occurred or a multi-element system that can provide confirming or supplementary coordinate data. In another aspect, a capacitive sensor is used to confirm or veto touch data from optical, surface acoustic wave, and force sensors. As is the case with the secondary force sensor, a secondary capacitive sensor may be a simple discrete type or capable of providing touch coordinates in its own right. In a specific embodiment, one in which no touch overlay is used on a CRT monitor, the secondary touch sensor may employ the resistive coating on the surface of the CRT in combination with a current monitoring circuit that measures the amplitude of the electromagnetic noise signal coupled to the resistive coating. In this application when the screen is touched by a grounded object, the detected signal amplitude change exceeds a preset threshold thus indicating a valid touch.
    • 提供了一种用于区分触摸屏系统中的假触摸的方法和装置。 该系统被设计为在触摸之前(即,向操作系统发送触摸坐标),确认由一个触摸传感器与另一个触摸传感器(最好是不同的传感器类型)登记的触摸。 如果第一触摸传感器登录的触摸未被第二触摸传感器确认,则触摸无效。 因此,使用一种类型的传感器的优点来克服另一种传感器的缺陷。 在一个方面,二次触摸传感器包括力传感器,以区分其他类型的触摸传感器的真实和错误触摸,例如光学和表面声波传感器上的污染物,电容传感器上的噪声或弱信号等。力传感器 可以是仅仅表示触摸已经发生的简单的单元件系统或者可以提供确认或辅助坐标数据的多元件系统。 另一方面,电容传感器用于确认或否决来自光学,表面声波和力传感器的触摸数据。 与次级力传感器的情况一样,次级电容式传感器可以是简单的离散型或能够自己提供触摸坐标。 在具体实施例中,在CRT监视器上没有使用触摸覆盖的实施例中,辅助触摸传感器可以与电流监视电路结合使用CRT表面上的电阻涂层,该电流监测电路测量耦合的电磁噪声信号的幅度 到电阻涂层。 在本应用中,当屏幕被接地物体触摸时,检测到的信号幅度变化超过预设的阈值,从而指示有效触摸。
    • 3. 发明授权
    • Dual sensor touchscreen utilizing projective-capacitive and force touch sensors
    • 双传感器触摸屏使用投影电容和力触摸传感器
    • US06492979B1
    • 2002-12-10
    • US09391352
    • 1999-09-07
    • Joel KentGeoffrey D. Wilson
    • Joel KentGeoffrey D. Wilson
    • G09G500
    • G06F3/044G06F3/0414G06F2203/04106
    • A method and apparatus for discriminating against false touches in a touchscreen system is provided. The system is designed to confirm a touch registered by one touch sensor with another touch sensor, preferably of a different sensor type, prior to acting upon the touch (i.e., sending touch coordinates to the operating system). If the touch registered by the first touch sensor is not confirmed by the second touch sensor, the touch is invalidated. Thus the strengths of one type of sensor are used to overcome the deficiencies of another type of sensor. This system is particularly well suited to meet the demands of an outdoor or semi-outdoor application. In one embodiment, one or more force sensors are used as the false touch sensor and a projective-capacitive sensor is used as the position coordinate determining sensor. In another embodiment, a projective-capacitive sensor is used as the false touch sensor. As the projective-capacitive sensor is only being used to provide touch confirmation, in this embodiment very few electrodes are required as well as minimal channel electronics. In another embodiment, both touch sensors are capable of providing accurate touch coordinates. In this configuration the system preferably determines which of the sensors is more likely to provide accurate information based on the circumstances.
    • 提供了一种用于区分触摸屏系统中的假触摸的方法和装置。 该系统被设计为在触摸之前(即,向操作系统发送触摸坐标),确认由一个触摸传感器与另一个触摸传感器(最好是不同的传感器类型)登记的触摸。 如果第一触摸传感器登录的触摸未被第二触摸传感器确认,则触摸无效。 因此,使用一种类型的传感器的优点来克服另一种传感器的缺陷。 该系统特别适合满足户外或半户外应用的需求。 在一个实施例中,使用一个或多个力传感器作为假触摸传感器,并且使用投影电容传感器作为位置坐标确定传感器。 在另一个实施例中,使用投射电容传感器作为假触摸传感器。 由于投影电容传感器仅用于提供触摸确认,在该实施例中,需要非常少的电极以及最小的通道电子元件。 在另一个实施例中,两个触摸传感器能够提供精确的触摸坐标。 在该配置中,系统优选地基于情况确定哪些传感器更可能提供准确的信息。
    • 10. 发明授权
    • Acoustic touchscreen having waveguided reflector arrays
    • 具有波导反射器阵列的声学触摸屏
    • US06636201B1
    • 2003-10-21
    • US09579584
    • 2000-05-26
    • Paulo Irulegui GomesJoel KentJames L. AroyanShigeki Kambara
    • Paulo Irulegui GomesJoel KentJames L. AroyanShigeki Kambara
    • G09G500
    • G06F3/0436
    • An acoustic touchscreen (1a) has transmitting transducers (23a, 23b) for generating acoustic signals which are deflected across a touch-sensitive area (2) by an array 13 of partially acoustically reflective elements 14. A touch on the touch-sensitive area causes a perturbation in the acoustic signals. After traversing the touch-sensitive area, the acoustic signals are redirected by another array 13 of partially acoustically reflective elements 14, towards receiving transducers (26a, 26b), where the signals (and any perturbations) are sensed. To accommodate touchscreens having narrow border regions (15a), the acoustic signals are propagated across the border regions using acoustic waveguides (18). The waveguide confines the acoustic signals to traveling along a narrow path width, but yet permit them to be deflected across the touch-sensitive area. In this manner, the transducers and reflective elements can in turn be of narrower construction and can fit within narrow border regions.
    • 声学触摸屏(1a)具有用于产生通过部分声学反射元件14的阵列13在触敏区域(2)上偏转的声学信号的发射换能器(23a,23b)。触敏区域上的触摸导致 声信号的扰动。 在穿过触摸敏感区域之后,声信号由另一个部分声学反射元件阵列13重定向到接收换能器(26a,26b),其中感测到信号(和任何扰动)。 为了适应具有窄边界区域(15a)的触摸屏,声信号通过声波导(18)在边界区域传播。 波导将声信号限制在沿着窄路径宽度行进,但是允许它们在触敏区域上偏转。 以这种方式,换能器和反射元件又可以具有更窄的结构并且可以适合于狭窄的边界区域。