Im not smart. Whats the difference if we had such a sensor technology already used today? Please tell me in easy to understand words.
Sensors have pixels. (well, photosites, but pixels is easier to type).
Pixels are little squares on a piece of silicon.
Between these pixels are little wires so all the colours can come off the chip.
So pixels don't take up the entire size of the chip.
But in 'backside' illumination, pixels take up the entire one side of the chip.
The wiring is on the other side of the chip.
So, no wiring between pixels means more space for pixels, means bigger pixels.
Bigger pixels means more DR at low-ISO, and less noise at higher-ISO (with everything else the same, in Sony' Exmore's case it's not the same, they're also much better because other bits of the circuit are also better, and why Sonikon have way better DR at low ISO than canon).
And yes, it's only in P&S for now, the smaller the sensor the more difference this technology makes. But it will make *some* difference at FF, and it's the way of the future (just don't hold your breath).