Patent ID: 8907871

Claim:
A touch screen assembly for an electronic device, the touch screen assembly comprising: a sealing glass comprising ion-exchange strengthened glass having a first coefficient of thermal expansion CTE 1 , and a plurality of touch sensor electrodes formed on at least an underside of the sealing glass opposite a face of the sealing glass; a backplane glass comprising ion-exchangeable glass having a device surface, an underside and a second coefficient of thermal expansion CTE 2 , wherein CTE 2 is within +/−15.0×10 −7 /° C. of CTE 1 and the device surface of the backplane glass is bonded and hermetically sealed to the underside of the sealing glass with a frit seal, the frit seal enclosing a device area between the underside of the sealing glass and the device surface of the backplane glass; an array of metal oxide thin film transistors deposited on the device surface of the backplane glass in the device area; wherein the array of metal oxide thin film transistors have a third coefficient of thermal expansion CTE 3 which is within +/−15.0×10 31 7 /° C. of CTE 2 ; and an array of OLED devices formed over the array of metal oxide thin film transistors in the device area on the device surface of the backplane glass.