Last time, Dr. Cédrick Chappaz introduced haptics and what is the sense of touch with the mechanoreceptors we have inside our skin.
So now, let’s see the differents technologies to be embedded into everyday life devices to deliver haptic features.
Haptics means mechanics. You need to deliver mechanical vibrations to get haptic feedback rendering.
Vibration based haptic feedback rendering
[Cédrick Chappaz]: One of the most common solutions is based on a huge vibration which is embedded into the device itself. How is it possible?
Let’s imagine a plastic rod:
On one side, you have a mass made of metal and on the other side it is just plastic. One is heavy, the other one is not.
If we made vibrations with this plastic rod on the plastic side, we would have low mechanical feedback. But on the opposite, if we do the same movement on the side with mass of metal, we really feel the strength in our hand.
Why? Because the mass is delivering inertia to the system. This is exactly how inertial based solutions deliver haptic feedback into displays!
If you integrate such kind of mechanical system into a smartphone, then you will have not only the display, but also the casing which will vibrate. That is the vibration based haptic feedback rendering you’ve got in your mobile.
Surface haptic feedback rendering
[C.C.]: But for a decade, another kind of haptic solution has emerged, called surface haptics.
On the opposite of inertial based solutions which are moving the full device, you aim to really focus the energy on the top surface of the display.
Instead of the plastic rod, let’s imagine a plastic ruler.
You probably tried in the past, when you were at school, to rub your plastic ruler to a woolen cloth then you have electrostatic force and you hair stands up! That is electrostatic force!
If you do the same into a display that means you have electrostatic force beneath the display, then your finger is attracted to it and you increase the friction.
That is one of the solutions used for surfaces haptic feedback rendering.
What is the difference with haptics by Hap2U?
[C.C.]: This is why Hap2U has developed a solution playing with friction but with mechanical feedback rendering.
Dr Cédrick Chappaz will explain to you more into details, in the next video, What is haptics by Hap2U.
And remember: Haptics is coming!