| |
IntelliTouch Surface Wave |
Acoustic Pulse Recognition |
Capacitive |
| Physical: |
|
|
|
| Construction |
Transducers and reflector stripes on all glass overlay (outside
of viewable area) |
Transducers on back of all glass overlay |
Glass overlay with ITO coatings on front and back with
silica overcoat |
| Light transmission |
Typically 92% |
Typically 92% |
Typically 85% |
| Reflection |
Less than capacitive |
Less than capacitive |
ITO coatings cause some additional reflections |
| Color purity |
Perfect |
Perfect |
ITO coatings alter colors slightly |
| Clarity |
Same as clear glass. No noticeable degradation using
USAF 1951 Resolution Chart |
Same as clear glass. No noticeable degradation using
USAF 1951 Resolution Chart |
ITO and antiglare coatings can make images
slightly less clear |
| |
IntelliTouch Surface Wave |
Acoustic Pulse Recognition |
Capacitive |
| Touch: |
|
|
|
| Resolution |
4096 x 4096
Z = 0–255 |
4096 x 4096 |
1024 x 1024 or greater
No Z |
| Accuracy |
Standard deviation of error is less than 2 mm (less
than ± 1%) |
1% max. error |
± 1.5% |
| Parallax |
Parallax error caused by thickness of touchscreen glass
and air gap |
Same |
Same |
| Calibration |
Stable |
None |
Can be less stable |
| Stability |
Touch coordinates do not change with environment (temperature,
humidity, surrounding metal, etc.) |
Touch coordinates do not change with environment (temperature,
humidity, surrounding metal, etc.) |
Touch coordinates can possibly change with environment.
May need recalibration periodically or when moved. |
| Sensitivity |
Very sensitive |
Sensitive |
Extremely sensitive |
| Speed |
< 10 ms (recognizes fastest taps). Faster than capacitive
in two-handed play. |
<10 ms (recognizes fastest taps) |
<10 ms (recognizes fastest taps), but slower in two-handed
play |
| Double touches |
Rejected |
Subsequent touches recognized without removing first |
Averaged |
| Stylus |
Soft (finger, glove, eraser) |
Finger, fingernail, pen, credit card |
Conductive (some people with dry or callused fingers
may have problems) |
| Diagnostics |
Touch function can be verified remotely |
None |
Not possible |
| |
IntelliTouch Surface Wave |
Acoustic Pulse Recognition |
Capacitive |
| Environmental: |
|
|
|
| Chemical resistance |
That of glass |
That of glass |
Silica overcoat |
| Surface durability |
No coatings to wear |
No coatings to wear |
ITO coating is protected by silica overcoat. However,
surface coatings can theoretically show wear. |
| Scratches |
Mohs' hardness rating of 7; can function with scratches |
Mohs' hardness rating of 7; can function with scratches |
Anti-glare hardcoat cannot be scratched using any stylus
with Mohs' rating < 6; scratches can make screen nonlinear |
| Dirt |
Maps around contaminants. Works with dust, ashes, finger
grease, smoke. |
Ignores |
No issues |
| Water |
Works with stationary water droplets (sneezes, wet fingers).
Must be wiped after spills |
Works through standing water |
No issue if water does not touch metal |
| Sealing |
Splash proof seal possible; watertight
seal included on Elo LCDs |
Watertight
seal included on Elo LCDs |
Splash proof seal possible |
| Cleaning |
Ordinary glass cleaners, alcohol |
Same |
Same |
* To compare Elo touch technologies more completely, see the product
specifications on www.elotouch.com or
the datasheets below:
In blind comparative tests on Photo Play, players voted for
Elo technologies in virtually every category. Read more from an
article in Play Machine magazine, March 2001 (English • Italian).
