10 May
1999
10 May
'99
5:05 a.m.
Re:
I've been playing with a HP 150 recently. Do any
of you physicists out there
know how the touch screen works? The electronics for it surround the screen
but don't seem to contact it. Some sort of static electricity capacitive
effect on one's finger?
Infrared beams...at least for the HP 150 A and B.
The first two models had visible holes where dust could get in and obscure
the IR LEDs. Later, HP added an IR-transparent bezel over them to avoid
that problem.