Apple has proposed a new principle of operation of touch screens. Instead of a multitude of capacitive sensors that are commonly used today, the engineers propose to install in the corners of the screen are four tiny radar that will determine the position of the finger. Potentially this will reduce the thickness, power consumption and cost of the screens of smartphones, as well as teach them to recognize neprikosnovenny to the screen a finger, say the authors of a published patent application.
As a rule, in modern smartphones, tablets and laptops with touch screen uses a capacitive layer for touch tracking. In this layer of the screen itself or between the pixels is a set of electrodes. They can detect a finger or other conductive object by the voltage change. This technology is well-proven, but still has drawbacks, including the screen it adds extra thickness and cost: laptops and other large devices, the difference between touch and normal screen is usually several tens of dollars.
Engineers from Apple have proposed an original alternative to capacitive screens — a small radar. The authors of the patent applications suggest the use of at least one radar, but mainly to describe a design with two or four cameras in the corners of the screen. They emit radio waves, recorded the reflected signals and it determines a two-dimensional or three-dimensional coordinates of a finger or other object.