Dual-Substrate-Sensor Stack with Electrodes Opposing a Display

Abstract

In one embodiment, an apparatus includes a display and a first and second substrate. Each substrate has a surface facing toward the display; a surface facing away from the display; and drive or sense electrodes of a touch sensor disposed on the surface of each substrate facing away from the display. The drive or sense electrodes are made of a conductive mesh of conductive material. The apparatus also includes an adhesive layer between the first and second substrates.

1 . An apparatus comprising:
 a display;   a first substrate and a second substrate, each substrate having:
 a surface facing toward the display; 
 a surface facing away from the display; and 
 drive or sense electrodes of a touch sensor disposed on the surface of each substrate facing away from the display, the drive or sense electrodes being made of a conductive mesh of conductive material; and 
   an adhesive layer between the first and second substrates.   
     
     
         2 . The apparatus of  claim 1 , wherein the conductive mesh comprises a plurality of mesh segments, each of the mesh segments having a width of approximately 10 μm. 
     
     
         3 . The apparatus of  claim 1 , wherein each of the mesh segments is substantially sinusoidal. 
     
     
         4 . The apparatus of  claim 1 , further comprising a dielectric layer separating the display from the second substrate. 
     
     
         5 . The apparatus of  claim 4 , wherein the dielectric layer comprises an air gap. 
     
     
         6 . The apparatus of  claim 4 , wherein the dielectric layer comprises another adhesive layer. 
     
     
         7 . The apparatus of  claim 1 , wherein the substrate is polyethylene terephthalate (PET), glass, or polycarbonate (PC). 
     
     
         8 . The apparatus of  claim 1 , wherein the adhesive layer is an optically clear adhesive (OCA). 
     
     
         9 . The apparatus of  claim 1 , further comprising a cover panel separated from the first substrate by another adhesive layer. 
     
     
         10 . An device comprising:
 a display;   a first substrate and a second substrate, each substrate having:
 a surface facing toward the display; 
 a surface facing away from the display; and 
 drive or sense electrodes of a touch sensor disposed on the surface of each substrate facing away from the display, the drive or sense electrodes being made of a conductive mesh of conductive material; 
   an adhesive layer between the first and second substrates; and   a computer-readable non-transitory storage medium embodying logic that is configured when executed to control the touch sensor.   
     
     
         11 . The device of  claim 10 , wherein the conductive mesh comprises a plurality of mesh segments, each of the mesh segments having a width of approximately 10 μm. 
     
     
         12 . The device of  claim 10 , wherein each of the mesh segments is substantially sinusoidal. 
     
     
         13 . The device of  claim 10 , further comprising a dielectric layer separating the display from the second substrate. 
     
     
         14 . The device of  claim 13 , wherein the dielectric layer comprises an air gap. 
     
     
         15 . The device of  claim 13 , wherein the dielectric layer comprises another adhesive layer. 
     
     
         16 . The device of  claim 10 , wherein the substrate is polyethylene terephthalate (PET), glass, or polycarbonate (PC). 
     
     
         17 . The device of  claim 10 , wherein the adhesive layer is an optically clear adhesive (OCA). 
     
     
         18 . The device of  claim 10 , further comprising a cover panel separated from the first substrate by another adhesive layer. 
     
     
         19 . An apparatus comprising:
 a cover panel;   a display;   a first substrate and a second substrate, each substrate having:
 a surface facing toward the display; 
 a surface facing away from the display; and 
 drive or sense electrodes of a touch sensor disposed on the surface of each substrate facing away from the display, the drive or sense electrodes being made of a conductive mesh of conductive material; 
   a first adhesive layer separating the cover panel from the first substrate;   a second adhesive layer between the first and second substrates; and   a dielectric layer separating the display from the second substrate.   
     
     
         20 . The apparatus of  claim 19 , wherein the substrate is polyethylene terephthalate (PET), glass, or polycarbonate (PC).