Low-power color TFT LCD display for hand-held embedded systems
Proceedings of the 2002 international symposium on Low power electronics and design
Low Power Control Techniques For TFT LCD Displays
CASES '02 Proceedings of the 2002 international conference on Compilers, architecture, and synthesis for embedded systems
Integrated power management for video streaming to mobile handheld devices
MULTIMEDIA '03 Proceedings of the eleventh ACM international conference on Multimedia
μSleep: a technique for reducing energy consumption in handheld devices
Proceedings of the 2nd international conference on Mobile systems, applications, and services
A compressed frame buffer to reduce display power consumption in mobile systems
Proceedings of the 2004 Asia and South Pacific Design Automation Conference
DLS: dynamic backlight luminance scaling of liquid crystal display
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
Improving energy efficiency by making DRAM less randomly accessed
ISLPED '05 Proceedings of the 2005 international symposium on Low power electronics and design
Energy-Adaptive Display System Designs for Future Mobile Environments
Proceedings of the 1st international conference on Mobile systems, applications and services
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Power consumption of the display subsytem has been a relatively less explored area compared to other components of a mobile device including computing, storage, and networking units, although the former often constitutes one of the most power-hungry portions of the system. Typical applications on a mobile device such as web browsing and text editing tend to have rather static image content; each frame hardly changes from the previous one. Efficiently detecting and handling no-motion scenarios is thus critical to extend the battery life. This paper focuses on image change detection. We propose to use checksum to detect image changes. Specifically, CRC hardware is used to optimize the power consumption of 1) refresh of a local display and 2) data compression for wireless remote display. Compared with a traditional, pixel-by-pixel comparison approach, using checksum for image change detection is not only fast, but also reduces accesses to the frame buffer, resulting in significant power savings. We have built a FPGA prototype to verify that CRC can capture image changes well enough to ensure a "visually lossless" quality.