Motivation• Mobile applications and services are having a profound effect on peoples lifestyles.• The energy consumption of mobile devices is a major challenge in sustaining the applications and services.• Cisco Forecast: Video streams will account for 66% of mobile data traffic by 2014. 2
Dynamic Backlight Scaling• The screen backlight consumes most of the energy for mobile streaming applications.• Dynamic backlight scaling is deemed a promising technical solution. Power distribution on HTC Desire when• When to dim the backlight to browsing videos on YouTube which level? • Video distortion • Hardware/software limitation • User perception • Etc. 3• Our IEEE/ACM ISLPED’11 Dynamic Backlight Scaling paper has the answer!
Android Software• Without changing their user preferences • Display with YouTube • Display with our software• Functionality • Turn on/off backlight scaling • Show/hide backlight scaling • Compute energy saved in joule and percentage • Pause, fast forward/backward 4
Possible Scenario I:Video Content Provider Video Stream Streaming Server Mobile Device• Backlight scaling information embedded in videos• Expected Profits • Less energy consumption for watching the same video • More attractive to mobile customers than other competitors 7
Possible Scenario II:Energy-Saving Service Provider Video Stream Streaming Server Backlight File Mobile Device Backlight Server• Backlight scaling information provided with videos• Expected Profits • 1million users x 30 dollars/month = 30 million dollars/month 8 • Facility rental + maintenance cost ≈ 2 million dollars/month • Net profit ≈ 28 million dollars/month
Conclusion• Mobile users are addicted to media applications, such as YouTube and IPTV, while energy consumption is a major challenge in sustaining the applications.• We propose a dynamic-backlight-scaling technology, develop it as Android software, and discuss potential business models to exercise the technology.• We have released our software on the Hami Apps so that people with Android phones can benefit from our technology. • With the software installed, an HTC Desire mobile phone can save 18-31% backlight energy when browsing videos on YouTube. 9
We are the Research Center for IT Innovation 10