The latest Sony Xperia Z3+/Z4 features a much improved wet finger tracking experience as previously reported. However, we now know the technology behind this as Qualcomm confirmed that the Xperia Z4 Tablet has “improveTouch” technology, a feature of the Snapdragon chipsets.
The technology has “advanced water rejection,” which is designed to eliminate any false touches from water. The touch algorithms use the processing power of the Qualcomm Snapdragon 810 chipset, instead of using an external, underpowered microcontroller. This means that single and multi-finger tracking becomes no issue under wet conditions as can be seen in the video demo below.