公开(公告)号：US20120050206A1

公开(公告)日：2012-03-01

申请号：US12870844

申请日：2010-08-29

Applicant: DAVID WELLAND

Inventor： DAVID WELLAND

IPC: G06F3/045 ,  G01R27/26

CPC classification number: G06F3/044 ,  G06F3/0416

Abstract: A method for interfacing with a capacitive touch screen is disclosed. The method includes charging an internal capacitor in the touch screen, which internal capacitor is disposed proximate a fixed location on the touch screen and is capable of changing in response to a touch at the specific location. After charging, the charge on the internal capacitor is transferred from the touch screen and the value of the charge on the internal capacitor then determined.

Abstract translation: 公开了一种用于与电容式触摸屏接口的方法。 该方法包括对触摸屏中的内部电容器进行充电，该内部电容器设置在触摸屏上的固定位置附近，并且能够响应于特定位置处的触摸而改变。 充电后，内部电容器的电荷从触摸屏传输，然后确定内部电容的电荷值。

公开(公告)号：US20100201382A1

公开(公告)日：2010-08-12

申请号：US12494417

申请日：2009-06-30

Applicant: DAVID WELLAND

Inventor： DAVID WELLAND

IPC: G01R27/26

CPC classification number: G01R27/2605 ,  H03K17/9622

Abstract: A circuit for determining a value of a variable capacitor comprises first circuitry for generating a first indication when a variable voltage across the variable capacitor exceeds a threshold voltage. Second circuitry generates a second indication when a reference voltage across a reference capacitor exceeds the threshold voltage. Control logic responsive to the first and second indications generate a control signal indicating whether the first indication or the second indication occurs first. A successive approximation engine generates an N-bit control value responsive to the control signal. A variable current source is responsive to the N-bit control value for generating a variable current to the first circuitry. A reference current source generates a reference current to the second circuitry.

Abstract translation: 用于确定可变电容器的值的电路包括当跨越可变电容器的可变电压超过阈值电压时产生第一指示的第一电路。 当参考电容两端的参考电压超过阈值电压时，第二电路产生第二指示。 响应于第一和第二指示的控制逻辑产生指示第一指示或第二指示是否首先出现的控制信号。 逐次逼近引擎响应于控制信号产生N位控制值。 可变电流源响应于N位控制值以产生到第一电路的可变电流。 参考电流源产生到第二电路的参考电流。