| Patent application number | Description | Published |
|---|
| 20080245582 | FLOATING CAPACITIVE COUPLERS USED TO ENHANCE SIGNAL COUPLING IN A CAPACITIVE TOUCHPAD - A capacitive touchpad comprised of drive electrodes and at least one sense electrodes disposed on or within an insulating substrate material, wherein an electrically floating capacitive coupler is disposed adjacent to both the drive electrodes and the sense electrode to thereby enhance signal coupling between the drive electrodes and the sense electrode caused by introduction of a pointing object. | 10-09-2008 |
| 20080278355 | INTRUSION DETECTION USING A CAPACITANCE SENSITIVE TOUCHPAD - A capacitance sensitive proximity and touch-sensitive detection device having an XY electrode grid sensor, wherein a compensation matrix is created when the capacitance sensitive touchpad is installed within a PIN Entry Device (PED), wherein the compensation matrix enables the capacitance sensitive touchpad to compensate and be balanced for the operating environment of the PED, and wherein physical keys of a keypad can be also be individually identified as an actuated key by using a unique “key profile” for each key, and wherein the insertion of a foreign conductive and/or dielectric material such as an intruding sensor in proximity of the XY electrode grid sensor of the touchpad will cause an imbalance in the electrodes on the capacitance sensitive proximity and touch-sensitive detection device, thereby alerting detection circuitry that tampering has occurred with the PED. | 11-13-2008 |
| 20090009485 | DRIVEN SHIELD FOR CAPACITIVE TOUCHPADS - A conductive shield that is disposed near the sensor, wherein a signal is driven on the shield that is similar to the signal induced on the sensor, thereby reducing stray capacitances and protecting the sensor from external noise sources, and resulting in a stronger signal reaching the sensor. | 01-08-2009 |
| 20090128515 | PROXIMITY SENSING BY INCREASING GAIN IN TOUCHPAD CIRCUITRY AND INCREASING DISTANCE BETWEEN SENSOR ELECTRODES AND A SENSE ELECTRODE - A touchpad, wherein proximity sensing is increased by modifying existing touch-sensitive capacitance touchpad technology, wherein the first method is to increase the gain of a SENSE P electrode of the touchpad, wherein a new balancing circuit is created on the SENSE N electrode to prevent circuit saturation, and wherein the touchpad can also be operated as a typical touch-sensitive device by opening a switch on the new SENSE N circuit, and wherein a second method is to increase a distance between the sense electrode and the touchpad sensor electrodes, and to increase the thickness of the sensor and sense electrodes. | 05-21-2009 |
| 20090135148 | PROXIMITY SENSING BY ACTIVELY DRIVING INTERESTED OBJECTS - A touchpad that includes the ability to send a signal along an electrode to a user, wherein the user is then visible to the touchpad without having to touch the surface of the touchpad, and wherein different signals can be transmitted simultaneously to different users so that the different users are simultaneously visible and distinguishable to the proximity sensitive touchpad. | 05-28-2009 |
| 20100328208 | ELECTRODE PATTERNS FOR CAPACITANCE SENSITIVE TOUCHPAD - A new layout for X, Y and Sense electrodes that enables a touchpad to be constructed using fewer layers while increasing visual clarity, transmissivity, sensitivity and linearity, wherein the electrodes are disposed in a pattern that uses spiral shapes that do not require electrodes to cross over any other electrodes. | 12-30-2010 |
| 20100328241 | METHOD AND SYSTEM FOR MEASURING POSITION ON SURFACE CAPACITANCE TOUCH PANEL USING A FLYING CAPACITOR - A touch panel having a substantially even coating of a conductive material on a non-conductive substrate and then covering the conductive material with a dielectric material, wherein a novel current measuring circuit reduces the effect of stray capacitance on the accuracy of a current measurement so that the relative X and Y position of an object on the touch panel can be determined using simple ratio equations. | 12-30-2010 |
| 20100328253 | SURFACE CAPACITANCE WITH AREA GESTURES - A surface capacitance touch sensitive surface (or “surface cap panel”) suitable for use in a touch screen or touchpad, wherein the surface cap panel has a substantially even coating of a conductive material on a non-conductive substrate and then covering the conductive material with a dielectric material, wherein a novel current measuring circuit reduces the effect of stray capacitance on the accuracy of a current measurement so that the relative X and Y position of an object on the surface cap panel can be determined using simple ratio equations, and wherein measuring the charge transfer rate in a measuring circuit, in addition to the total charge transfer for each toggle event, enables the location of two objects to be identified on the surface cap panel, wherein the charge transfer rate is used to determine the distance between two points of contact on the surface cap panel, and wherein height and width information related to the distance between the two points of contact can now be determined by doubling the number of electrodes at the corners of the surface cap panel. | 12-30-2010 |
| 20110001713 | INTERDIGITATED RANDOMIZED ELECTRODE PATTERN TO INCREASE THE AREA OF A TOUCHPAD HAVING A LIMITED NUMBER OF CONTROLLER IC DRIVE PINS - Increasing the effective size of a touchpad while using a single controller IC, wherein a pseudo random pattern is used such that when a certain order of electrical signals is applied to the electrodes, the local electrical fields cancel or are very large in a first region while the electrical fields in a second region create a desired electrical field pattern, wherein when a finger makes contact in the second region a certain electrical signal is expected, wherein when a finger makes contact in the first region the electrical signal is unexpected, and wherein the difference between the electrical signals from the first region and the second region can be distinguished and thus the region in which the finger made contact can be determined. | 01-06-2011 |
| 20110037724 | SYNCHRONOUS TIMED ORTHOGONAL MEASUREMENT PATTERN FOR MULTI-TOUCH SENSING ON A TOUCHPAD - A method for detecting multiple objects on a touchpad having a grid of orthogonal electrodes, wherein all drive electrodes are simultaneously stimulated, and then frequency or electrode coding is used to separate each electrode junction and produce a capacitance image of the touchpad surface in a single measurement sequence. | 02-17-2011 |
| 20110063242 | Method and system for measuring position on surface capacitance touch panel using a flying capacitor - A touch panel having a substantially even coating of a conductive material on a non-conductive substrate and then covering the conductive material with a dielectric material, wherein a novel current measuring circuit reduces the effect of stray capacitance on the accuracy of a current measurement so that the relative X and Y position of an object on the touch panel can be determined using simple ratio equations. | 03-17-2011 |
