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September 14, 2004
Mobile HCI 2004: screen and power limitations
what can you say with only three pixels?
Peter Tarasewich
focus on ultramobile devices - rings, watches, bracelets
small screen if any
used in a variety ofcontexts (anytime, anywhere)
notification cues
indicate status or availability of information that might be of interest
cues convey metainformation
pixel-based notification cues
one or more lights (e.g. LEDs) to convey information
previous studies looked at display sizes and configurations, colours, flashing
a linear three light design has a balance of good user performance and high user preference in a small footprint
3 pixels
each 3 different colours, 2 intensities
groups had to learn messages and meanings
(108 different)
e.g. new short message via email from a work colleague received with high priority
up to 5 bits of information easy to learn, increased time (due to more complex messages) - still aceptable up to 6.75 bits
people read pixels from left to right - more errors on right hand side
what happens if information is less structured?
does using LEDs rather than screen simulation change the experiment?
how do these cues affect attention?
benefits - low power, sent quietly
if personalised, are highly secure
why red, blue and green (not red, yellow, green?)
not all information is mapped onto a scale that is assumed by red, yellow and green
next test allows users to pick their colours
*****
Battery life and user acceptance of energy aware interfaces
HP
Lance Bloom
handheld 'achilles heel' - battery charge life
displays consume up to 60% of system power
OLEDs can reduce power by 10
and only have to consume energy where change is happneing
12 PDA users in Boston - used for work and personal activities
battery life displayed on interface
5 types of interfaces evaluated
inversion extends battery life by 3 times
green-on-black by 20 times
battery life important as a user issue (memory and processor speed higher - use of MS PDAs influences?)
lighter gradients preferred to darker gradients
inversion interfaces rated more highly than baseline interfaces
display-based battery consumption reductions do not necessitate usability reductions
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