Building a capacitive touch interface on a dual-technology display

February 04, 2014 // By Graham Prophet
Yota Devices, makers of the YotaPhone, designed a dual function display that combines LCD for a “normal” smartphone display, plus and e-paper display to retain information when the phone is powered off. Creating the capacitive touch interface for the screen is a design win for TouchNetix.

Over the past year, TouchNetix has developed a true single layer touchscreen design, manufactured directly on the front lens of the handset to minimise thickness and weight; and then coupled this with a capacitive gesture sensor alongside the Electronic Paper Display. The combined interfaces optimise usability, power consumption and functionality in a product that combines characteristics of smartphone and e-reader. TouchNetix comments that the, “dual screen concept has challenged conventional capacitive touch interface thinking.”

TouchNetix is an independent company whose personnel include some former employees of Atmel’s Touch business; the company takes silicon (for touch interfaces) from the open market and designs sensors and panels for, “...medium and low volume mission critical markets such as medical and industrial through to the highest volume state of the art mobile handset markets.”