Patent ID: 8963858
Filing Date: 2015-02-24
Classification: G06F

Abstract:
1. A touch screen proximity sensing apparatus comprising: a touch screen comprising a bottom layer and a top layer wherein the top layer and bottom layer are oriented such that they are separate but capable of being temporarily pressed together by a user; a control circuit operatively connected to the touch screen; a plurality of measurement circuits comprising: wherein the proximity capacitance sensor circuit detects an object by determining an equivalent capacitance between the touch screen and the object, and comprise a bias circuit configured to apply a particular voltage to the bottom layer of the touch screen, said particular voltage being substantially the same as the voltage applied to the top layer; wherein the resistive sensor circuit measures a touch position by measuring a voltage along a voltage gradient on at least one of the top layer and bottom layer; wherein the control circuit selectively connects the touch screen with one of the plurality of measurement circuits; and wherein the control circuit disables the first measurement circuit when said object is detected, said object being a face of said user, the control circuit only enabling the first measurement circuit when said object is no longer detected.