“…Display technology is becoming ubiquitous with the continuous spread of smart phones, tablets, and laptops throughout the world. , In the future, flexible, transparent, and wearable electronics are expected to emerge, − further increasing the demand for display technologies. Touch screens, which detect the touch to its surface to carry out various user interface operations, are a critical feature of display technology. , Over the years, touch screens have evolved from single touch to multitouch gesture recognition . The next generation of touch screens is expected to be able to detect multiple levels of pressure, , (i.e., the so-called 3D touch screens) which will enable a wide variety of new functions.…”