Source: http://patents.com/us-10095361.html
Timestamp: 2018-12-11 14:11:37
Document Index: 698910171

Matched Legal Cases: ['Application No. 05709125', 'Application No. 05709125', 'Application No. 05709125', 'Application No. 05709125', 'Application No. 05709125', 'Application No. 05709125', 'Application No. 05709125', 'Application No. 05709125', 'Application No. 2007', 'Application No. 2007']

US Patent # 1,009,5361. Stylus detection with capacitive based digitizer sensor - Patents.com
United States Patent 10,095,361
Mishalov October 9, 2018
Mishalov; Vadim (Tel-Aviv, IL)
Family ID: 55661588
15/070,380
US 20160274700 A1 Sep 22, 2016
62134613 Mar 18, 2015
Current CPC Class: G06F 3/0418 (20130101); G06F 3/044 (20130101); G06F 3/03545 (20130101); G06F 2203/04104 (20130101)
Current International Class: G06F 3/044 (20060101); G06F 3/041 (20060101); G06F 3/0354 (20130101)
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1. A method comprising: detecting a signal on first electrodes along a first axis of a digitizer sensor and on second electrodes along a second axis of the digitizer sensor, wherein the signal is a signal transmitted by a handheld device interacting with the digitizer sensor; detecting hand input on the first electrodes and on third electrodes along the second axis and detecting no hand input on the second electrodes, wherein the hand input detection is based on self capacitive detection; estimating the signal transmitted by the handheld device on the first electrodes as a pre-defined constant multiplied by a peak gain of the signal on the second axis and by a ratio of finger effects detected from the hand input, wherein the ratio is a first finger effect along the first axis over a second finger effect along the second axis; determining coordinates of the handheld device based on the signal detected on the second electrodes and the signal estimated on the first electrodes; and reporting the coordinates to a host computing device associated with the digitizer sensor.
Reference is now made to FIGS. 4A and 4B showing simplified graphical representations of exemplary stylus based output and concurrent exemplary finger based output while a hand is coupled with sensing lines receiving a stylus signal on one axis and is not coupled with sensing lines receiving the stylus signal along the other axis in accordance with some embodiments of the present disclosure. When hand input 245 coincides with stylus input 205 on one axis, e.g. row axis as shown in FIG. 4A, the hand may pick up a stylus signal transmitted on the coinciding conductive strip and then inject that signal back on to conductive strips capacitive coupled with the hand. The signal injected back onto the conductive strip from the hand typically has an 180.degree. phase shift or close to 180.degree. phase shift, with respect to signal that was picked up directly from the stylus. During stylus based detection (FIG. 4A), output 240 corresponding to hand input 245 and output 210 corresponding to stylus input 205 may be detected on one axis and output 230 corresponding to both hand input 245 and stylus input 205 may be detected on the other axis. In addition, hand input 245 is detected in finger based detection (FIG. 4B) based on output 270 on one axis and output 260 on the other axis. According to some exemplary embodiments, self-capacitive detection is applied for the finger based detection since self-capacitive detection may be used to identify all conductive strips coupled with the hand. Optionally, mutual capacitive detection may also be performed to identify coordinates of multiple hand input.
According to some exemplary embodiments, outputs 210, 260 and 270 may be compared to a pre-defined inter axis impedance ratio to estimate or predict output on the axis including interference, e.g. the row axis in FIG. 4A. The inter axis impedance ratio is typically stable for both stylus based detection and finger based detection and is typically a function of physical characteristics of the digitizer sensor and its topology. The inter axis impedance ratio, K may be defined by the following equation: K=(Px/Py)/(Fx/Fy) Equation (1)
The length of the Py array and the Fy array are assumed to be the same since it is dependent on the dimension of the touch on a same axis. According to some exemplary embodiments, K is estimated for computing device during a dedicated calibration procedure that may be carried out during start up of the system or at a manufacturing site and then stored in memory associated with circuit 25 or host 22. During stylus detection, interference due to hand touch on one axis may be overcome by estimating Py using the following relationship: Py=(Px/K)/(Fx/Fy) Equation (2)
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