QUOTE(alieamin @ Oct 25 2011, 01:49 PM)
S-pen does not require a battery,but im wondering what they use to power the pen, because then pen have a button, press it for certain task.
hmmm... could be sth like what was used in HP 2740p notebooks....was checking it out... some dun require battery. from wikipedia:
QUOTE
Passive tablets, most notably those by Wacom, make use of electromagnetic induction technology, where the horizontal and vertical wires of the tablet operate as both transmitting and receiving coils (as opposed to the wires of the RAND Tablet which only transmit). The tablet generates an electromagnetic signal, which is received by the LC circuit in the stylus. The wires in the tablet then change to a receiving mode and read the signal generated by the stylus. Modern arrangements also provide pressure sensitivity and one or more switches (similar to the buttons on a mouse), with the electronics for this information present in the stylus itself, not the tablet. On older tablets, changing the pressure on the stylus nib or pressing a switch changed the properties of the LC circuit, affecting the signal generated by the pen, which modern ones often encode into the signal as a digital data stream. By using electromagnetic signals, the tablet is able to sense the stylus position without the stylus having to even touch the surface, and powering the pen with this signal means that devices used with the tablet never need batteries. Activslate 50, the model used with Promethean Ltd white boards, also uses a hybrid of this technology.
so... you need to touch the screen or hovering on top is also enough?
Oct 25 2011, 03:02 PM

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