| Patent application number | Description | Published |
|---|
| 20080266266 | Touchscreen for detecting multiple touches - A touchscreen system comprises a touch area. At least one transmitter is positioned proximate to outer edges of the touch area for transmitting first beams in a first direction. At least one beam splitter is positioned proximate to the outer edges of the touch area for splitting the first beams into at least second and third beams that travel through the touch area in at least second and third directions, respectively. The at least one beam splitter comprises a plurality of deflecting elements. Receivers are positioned proximate to the outer edges of the touch area for receiving the at least second and third beams. | 10-30-2008 |
| 20090008160 | Method and system for detecting touch events based on magnitude ratios - A method for detecting a touch event on a touch panel comprises obtaining at least first and second signals from at least two sensors where the at least first and second signals are responsive to a touch event. A first amplitude magnitude associated with the first signal is calculated and a second amplitude magnitude associated with the second signal is calculated. A magnitude ratio is determined between the first and second amplitude magnitudes, and a touch location is identified based on the magnitude ratio. | 01-08-2009 |
| 20090009488 | Method and system for detecting touch events based on redundant validation - A method of detecting a touch event on an acoustic fingerprint based touch system comprises digitizing at least two signals to form first and second sets of digitized signals. The at least two signals are received from at least two sensors on a touch panel. A frequency transform is performed upon the first and second sets of digitized signals to form first and second frequency transform data sets of frequency components. At least first and second live fingerprints are constructed wherein at least one of the first and second live fingerprints is based on the first and second frequency transform data sets. A touch location is identified based on the at least first and second live fingerprints. | 01-08-2009 |
| 20090046073 | Touchscreen using both carbon nanoparticles and metal nanoparticles - A cover sheet assembly is provided for a touchscreen system. The cover sheet assembly includes an insulating layer having a surface configured to be disposed over an electrically conductive area of a substrate of the touchscreen system, and an electrically conductive material disposed on at least a portion of the surface of the insulating layer. The electrically conductive material includes a plurality of carbon nanoparticles and a plurality of metal nanoparticles. | 02-19-2009 |
| 20090046078 | Touchscreen using oriented microscopic linear conductive elements - A cover sheet assembly is provided for a touchscreen system. The cover sheet assembly includes an insulating layer having a surface configured to be disposed over an electrically conductive area of a substrate of the touchscreen system. An electrically conductive material is disposed on at least a portion of the insulating layer surface. The electrically conductive material includes a plurality of microscopic linear conductive elements arranged in a pattern that is oriented with respect to a first direction of a first polarization of light such that the electrically conductive material is more transparent to the first polarization of light than to a second polarization of light that is polarized in a second direction that is perpendicular to the first direction. | 02-19-2009 |
| 20090109195 | METHOD AND APPARATUS FOR LAPLACE CONSTRAINED TOUCHSCREEN CALIBRATION - A computer readable medium has instructions to calibrate a touch system by detecting touch points on a touchscreen that are each associated with touchscreen coordinates in a touchscreen coordinate system. The instructions associated each of the touch points with known calibration targets, and each of the calibration targets has display coordinates in a display coordinate system that is associated with at least one of a display screen and an operating system. The instructions fit the display coordinates and the touchscreen coordinates non-linearly with respect to each other based on a generalized Laplace-constrained fit that is used to identify correction parameters used to map a user generated run-time touch point on the touchscreen to a display coordinate location on a display screen. The correction parameters represent non-linear corrections. | 04-30-2009 |
| 20090322700 | METHOD AND APPARATUS FOR DETECTING TWO SIMULTANEOUS TOUCHES AND GESTURES ON A RESISTIVE TOUCHSCREEN - Resistive touchscreen system has substrate and coversheet with first and second conductive coatings. The substrate and coversheet are positioned proximate each other such that the first conductive coating faces the second conductive coating. The substrate and coversheet are electrically disconnected with respect to each other in the absence of a touch. First set of electrodes is formed on the substrate for establishing voltage gradients in first direction. Second set of electrodes is formed on the coversheet for establishing voltage gradients in second direction wherein the first and second directions are different. Controller biases the first and second sets of electrodes in first and second cycles and senses a bias load resistance associated with at least one of the sets of electrodes. The bias load resistance has a reference value associated with no touch. A decrease in the bias load resistance relative to the reference value indicates two simultaneous touches. | 12-31-2009 |
| 20100214231 | METHOD AND APPARATUS FOR TWO-FINGER TOUCH COORDINATE RECOGNITION AND ROTATION GESTURE RECOGNITION - A resistive touchscreen system comprises a substrate, a coversheet and a controller. The coversheet comprises a first conductive coating and the substrate comprises a second conductive coating. The substrate and coversheet are positioned proximate each other such that the first conductive coating faces the second conductive coating, and the substrate and coversheet are electrically disconnected with respect to each other in the absence of a touch. The controller is configured to (a) identify a multiple touch state when the substrate and coversheet are electrically connected with respect to each other at at least two touch locations, (b) to detect, over time, a plurality of apparent touch coordinates, (c) identify two possible X coordinates and two possible Y coordinates associated with at least one of the apparent touch coordinates, and (d) identify coordinate locations of two touches based on the apparent touch coordinates and the two possible X and Y coordinates. | 08-26-2010 |
| 20100295813 | SYSTEM AND METHOD FOR A PROJECTED CAPACITIVE TOUCHSCREEN HAVING GROUPED ELECTRODES - A projected capacitive touchscreen system has triangular-shaped electrodes coupled to a substrate. Adjacent ones of the electrodes alternate between first and second orientations to form an interleaved arrangement. The electrodes having the first orientation are electrically connected into greater than two groups that each have at least two semi-adjacent electrodes and the electrodes having the second orientation are electrically connected into at least one group that has at least two semi-adjacent electrodes. A controller detects signal levels associated with at least one touch on the substrate from the greater than two groups and the at least one group. The signal levels are used to determine both X and Y coordinate positions of the at least one touch. | 11-25-2010 |
| 20100295814 | ELECTRODE CONFIGURATIONS FOR PROJECTED CAPACITIVE TOUCH SCREEN - A projected capacitive touch screen is provided that comprises a substrate and electrodes. The substrate defines an active touch zone surrounded by edges. The active touch zone includes a central active zone and an acceleration zone that is located proximate to, and extends along, at least one of the edges. The electrodes are provided on the substrate and are organized into first and second sets of electrodes that are contained within a common plane on the substrate. The first set of electrodes is interlaced with the second set of electrodes in a non-overlapping pattern on the substrate. At least a subset of the electrodes each has an apex and a base and a non-uniform triangular shape that extends along a longitudinal axis between the apex and the base. The subset of the electrodes is located such that at least a portion of the non-uniform triangular shape is located within the acceleration zone. The non-uniform triangular shape may be formed in part by varying an electrode width more rapidly near a perimeter of the active touch zone than the variation of the electrode width near a center of the active touch zone. The non-uniform triangular shape and non-overlapping pattern provide edge acceleration to compensate for signal loss when a portion of a finger contact area moves beyond the edge outside of the active touch zone. The non-uniform triangular shape may include a first pitch proximate to the base and a second pitch proximate to the apex. The pitch represents a rate of change in a width of the electrode per unit of distance along the longitudinal axis of the electrode. | 11-25-2010 |
| 20110025638 | SYSTEM AND METHOD FOR A PROJECTED CAPACITIVE TOUCHSCREEN HAVING WEIGHT BASED COORDINATE DETERMINATION - A touch location on a capacitive touchscreen system is identified by receiving signals in response to a touch from electronic channels connected to one electrode or to a group of semi-adjacent electrodes provided on a substrate. Adjacent ones of the electrodes have substantially triangular shapes that alternate between a first and second orientation to form an interleaved arrangement such that the touch generates a signal cluster comprising the signals generated from a series of adjacent electronic channels. Weights with at least two different numerical values are applied to the signals from the series of adjacent electronic channels. The at least two different numerical values are based on levels of the signals. A location of the touch on the substrate is determined based on the weighted signals. | 02-03-2011 |
| 20110025649 | METHOD AND APPARATUS FOR DETECTING HOLD CONDITION ON AN ACOUSTIC TOUCH SURFACE - A bending wave touch system includes at least one sensor and a touchscreen controller. The at least one sensor is coupled to a substrate and is responsive to vibrations in the substrate. The at least one sensor outputs signals. The controller receives the signals from the at least one sensor and identifies touch coordinates based on high frequency components of the signals when a touch on the substrate includes at least one of a tap, a drag and a lift-off. The controller identifies a status of a hold condition of the touch based on at least two different time averages of low frequency components of the signals. | 02-03-2011 |
