How does 'tap to wake' works?

[hank moody]

I mean, iphone is always 'listening', waiting for me to tap it? This would drain the battery fast.

How does it work, technically?

 

[Sir Ruben]

The Apple Watch does it. Doesn't seem to be a big deal. It just works.

 

[itsmemuffins]

It waits… cat like.

 

[Nozuka]

it's mostly an AMOLED feature.
LCD: if you power the screen, you power the digitizer. they are connected.

with AMOLED you can turn off/on every pixel separately to get true black. but obviously the whole touch screen still needs to work even in places where pixels are turned off and that's why it's powered independently. with this they can keep the touch screen waiting all the time and it barely uses any power.

at least that's what i read somewhere.

 

[hank moody]

it's mostly an AMOLED feature.
LCD: if you power the screen, you power the digitizer. they are connected.

with AMOLED you can turn off/on every pixel separately to get true black. but obviously the whole touch screen still needs to work even in places where pixels are turned off and that's why it's powered independently. with this they can keep the touch screen waiting all the time and it barely uses any power.

at least that's what i read somewhere.

thank you for this.
So, the screen is working, everything is working but the pixels are black, right?