Secure touchscreen device

Abstract

Secure touchscreen devices are disclosed. In one embodiment, a secure touchscreen assembly may include a first patterned conductive layer comprising a first touch sensing grid and a first tamper sensing grid, the first tamper sensing grid disposed in areas of the first conductive layer where the first touch sensing grid is not present and is not in physical contact with the first touch sensing grid, and tamper sensing circuitry coupled to the first tamper sensing grid that detects a tamper by detecting change in conductivity in the first tamper sensing grid.

1 . A secure touchscreen assembly comprising:
 a first patterned conductive layer comprising a first touch sensing grid and a first tamper sensing grid, the first tamper sensing grid disposed in areas of the first conductive layer where the first touch sensing grid is not present and is not in physical contact with the first touch sensing grid; and   tamper sensing circuitry coupled to the first tamper sensing grid that detects a tamper by detecting change in conductivity in the first tamper sensing grid.   
     
     
         2 . The secure touchscreen assembly of  claim 1 , further comprising:
 a second patterned conductive layer comprising a second touch sensing grid; and   an electrically insulative layer disposed between the first patterned conductive layer and the second patterned conductive layer.   
     
     
         3 . The secure touchscreen assembly of  claim 2 , wherein the second patterned conductive layer further comprises a second tamper sensing grid that is disposed in areas of the second conductive layer where the second touch sensing grid is not present and is not in physical contact with the second touch sensing grid; and
 wherein the tamper sensing circuitry is further coupled to the second tamper sensing grid and further detects the tamper by detecting a change in conductivity in the second tamper sensing grid.   
     
     
         4 . The secure touchscreen assembly of  claim 1 , further comprising a first protective covering layer disposed between the first patterned conductive layer and the electrically insulative layer, wherein the first protective covering layer is patterned to expose the first touch sensing grid to the electrically insulative layer. 
     
     
         5 . The secure touchscreen assembly of  claim 3 , further comprising a second protective covering layer disposed between the second patterned conductive layer and the electrically insulative layer, wherein the second protective covering layer is patterned to expose the second touch sensing grid to the electrically insulative layer. 
     
     
         6 . The secure touchscreen assembly of  claim 1 , further comprising touch sensing circuitry coupled to the first touch sensing grid and the second touch sensing grid that detects a touch by detecting a change in capacitance in the first touch sensing grid and the second touch sensing grid. 
     
     
         7 - 22 . (canceled)