Biometric sensing
First Claim
Patent Images
1. An impedance sensor configured to operate in a dual resolution processing mode for processing touch input at a touch screen device, the sensor comprising a processing unit configured to:
- determine, in a low resolution mode, whether an object creating the touch input has changed its position on the touch screen device;
in response to determining in the low resolution mode that the object has changed its position on the touch screen device, output the position of the object determined in the low resolution mode;
in response to determining in the low resolution mode that the object has not changed its position on the touch screen device, compute a coarse position of the object and switch from the low resolution mode to a high resolution modecompute, in the high resolution mode, a fine position difference of the object relative to the coarse position; and
output the coarse position of the object adjusted by the fine position difference.
3 Assignments
0 Petitions
Accused Products
Abstract
An novel sensor is provided having a plurality of substantially parallel drive lines configured to transmit a signal into a surface of a proximally located object, and also a plurality of substantially parallel pickup lines oriented proximate the drive lines and electrically separated from the pickup lines to form intrinsic electrode pairs that are impedance sensitive at each of the drive and pickup proximal locations.
721 Citations
15 Claims
-
1. An impedance sensor configured to operate in a dual resolution processing mode for processing touch input at a touch screen device, the sensor comprising a processing unit configured to:
-
determine, in a low resolution mode, whether an object creating the touch input has changed its position on the touch screen device; in response to determining in the low resolution mode that the object has changed its position on the touch screen device, output the position of the object determined in the low resolution mode; in response to determining in the low resolution mode that the object has not changed its position on the touch screen device, compute a coarse position of the object and switch from the low resolution mode to a high resolution mode compute, in the high resolution mode, a fine position difference of the object relative to the coarse position; and output the coarse position of the object adjusted by the fine position difference. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A dual resolution sensing system configured to operate in dual resolution processing modes for processing low resolution, high speed positioning and high resolution, slow speed motion tracking, said system comprising:
-
a primary grid comprising overlapping grid lines spaced at a first spacing, wherein the primary grid comprises a plurality of substantially parallel primary drive lines spaced at the first spacing and a plurality of substantially parallel primary pickup lines arranged transversely to the primary drive lines and spaced at the first spacing; a secondary grid including each of the plurality of substantially parallel primary drive lines and each of the plurality of substantially parallel primary pickup lines of the primary grid and comprising overlapping groups of grid lines, wherein the grid lines in each group of the overlapping groups of grid lines of the secondary grid are spaced at a second spacing that is smaller than the first spacing and include (i) a primary drive line and at least one secondary drive line parallel to the primary drive line and spaced from the primary drive line at the second spacing and (ii) a primary pickup line and at least one secondary pickup line parallel to the primary pickup line and spaced from the primary pickup line at the second spacing, and wherein the overlapping groups of grid lines of the secondary grid define a plurality of sensing clusters, each sensing cluster being comprised of a plurality of overlapping grid lines spaced at the second spacing, and wherein the clusters are spaced from one another by a distance that is greater than the second spacing; and a processing unit configured to; determine, in a low resolution mode, whether an object contacting the system has changed its position based on data signals from the primary grid, and determine, in a high resolution mode, localized features of an object contacting the system based on data signals from one or more sensing clusters of the secondary grid. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
-
Specification