A wireless phone is equipped with a 2D optical sensor, enabling a variety of applications. The composition comprises a hard component having an elongation of less than about 150%, a soft component having an elongation of greater than about 200%, and a cross-linking agent. And polarization dependent loss may be reduced by forming a metal heater using a first set of metal deposition parameters; forming a conductive metal structure contacting the metal heater using a second set of metal deposition parameters; and selecting the first set of metal deposition parameters and the second set of metal deposition parameters to reduce stress. One of the two electrodes of the auxiliary capacitors is connected to a switching element together with a pixel electrode.