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—Backlight systems dominate the power requirements of battery-operated hand-held devices with color thin-film transistor (TFT), liquid crystal displays (LCDs). We introduce dynamic luminance scaling of the backlight with appropriate image compensation. Dynamic backlight luminance scaling (DLS) keeps the perceived intensity or contrast of the image as close(More)
An LCD (Liquid Crystal Display) is a standard display device for hand-held embedded systems. Today, color TFT (Thin-Film Transistor) LCDs are common even in cost-effective equipments. An LCD display system is composed of an LCD panel, a frame buffer memory, an LCD and frame buffer controller, and a backlight inverter and lamp. All of them are heavy power(More)
The MPEG-21 Multimedia Framework initiative aims to support a wide range of networks and devices in the delivery and consumption of multimedia resources. One of the primary goals of MPEG-21 is universal multimedia access (UMA) through Digital Item Adaptation (DIA), which supports multimedia streaming to heterogeneous terminal devices ensuring the same(More)
In this paper, we introduce a precise energy characterization of SDRAM main memory systems and explore the amount of energy associated with design parameters, leading to energy reduction techniques that we are able to recommend for practical use.We build an in-house energy simulator for SDRAM main memory systems based on cycle-accurate energy measurement(More)
Dynamic Luminance Scaling (DLS) reduces the backlight power consumption of a color TFT LCD while maintaining the image brightness or contrast. Extended DLS (EDLS) is a framework for backlight power management of transflective LCD panels. It switches between DLS and Dynamic Contrast Enhancement (DCE) depending on the panel mode, which may be transmissive or(More)
Despite the limited power available in a battery-operated hand-held device, a display system must still have an enough resolution and sufficient color depth to deliver the necessary information. We introduce some methodologies for frame buffer compression that efficiently reduce the power consumption of display systems and thus distinctly extend battery(More)
Designing cost-sensitive embedded products such as cellular phones and portable media players requires maximizing a platform's performance while minimizing energy use. For example, if two software implementations of an MPEG-4 decoder perform quite differently on the same target platform , clearly the more efficient version will result in a more(More)
Memory systems are dominant energy consumers, and thus many energy reduction techniques for memory buses and devices have been proposed. For practical energy reduction practices, we have to take into account the interaction between a processor and cache memories together with application programs. Furthermore, energy characterization of memory systems must(More)
Dynamic Luminance Scaling (DLS) reduces the backlight power consumption of color TFT LCD while maintaining the image brightness or contrast. This paper presents extended DLS (EDLS) as a framework for the backlight power management of the transflective LCD panels. The EDLS framework switches between DLS and Dynamic Contrast Enhancement (DCE) depending on the(More)