|
|
Capacitive |
Resistive |
SAWSurface Acoustic Wave |
|
Optics/Clarity |
85% light transmission,
excellent clarity |
75%, Clear finish, good
clarity |
90% light transmission,
excellent clarity |
|
Durability |
Excellent, contains hardened
glass surface with conductive under coating |
Good, contains hardcoated plastic overlay, subject to vandalism |
Excellent, contains no
overlays, all glass panel |
|
Reliability |
Very High |
High |
Very High |
|
Accuracy, Calibration
Stability |
Very accurate, very stable |
Very Accurate, very stable |
Extremely Consistent, Very
Stable, |
|
Activation, Sensitivity |
Finger contact for touch
activation. Easily detects contact. |
Pressure sensitive. Activated
by any object, good for gloved applications. |
Soft objects, Non-glare
requires significant contact. |
|
Touch Resolution |
Very High (> 250pts./in.)
4096 x4096 |
High (>200 pts./in.) |
Very high (>200 pts./in.)
4096 x4096 |
|
Response Time |
8-12 milliseconds |
5-10 milliseconds |
10-15 milliseconds |
|
Stylus |
Conductive Only |
Hard or Soft, not sharp |
Soft Only |
|
Sealing |
Easy |
Must seal in inactive area |
Must seal in active area with
low acoustic absorption materials |
|
Parallax |
Low |
Low |
Low |
|
Z-Axis |
None |
None |
Yes-255 levels of pressure |
|
Multiple Touch |
Averages simultaneous touches |
Averages simultaneous touches |
Rejects simultaneous touches |
|
Touch Life |
Many Millions of touches |
Millions of touch |
Many Millions of touches |
|
Controllers Available |
RS-232 Serial, PS2, USB,
PC-Bus, or Mac ADB |
RS-232 Serial, PS2, USB,
PC-Bus, or Mac ADB |
RS-232 Serial, PC-Bus, or Mac
ADB |
|
Sealing from environment |
Very easy |
Very easy |
Difficult |
|
Main Problems |
Must make contact with
conducting object(finger/stylus) |
Scratches easiest |
Moisture, dirt and dust
creating dead zones |
|
Maintenance Required |
Normal cleaning of finger
prints |
Normal cleaning of finger
prints |
Requires most cleaning in
dusty environments |
