Reducing display power in DVS-enabled handheld systems

ABSTRACT

Recently power management of display modules has become important for handheld systems. In this paper, we observe the interaction between the LCD, main consumer of the power in handheld systems, and the CPU. We propose an efficient method which reduces power consumption of the handheld system by controlling the voltage and frequency of the CPU to reduce display power. The experimental result on Mainstone II with PXA270 shows that the proposed mechanism reduces power consumption of the system by 41% and 15% for multimedia applications and web applications, respectively, when compared to the conventional DVS (Dynamic Voltage Scaling) scheme.

REFERENCES

• 1: Franco Gatti , Andrea Acquaviva , Luca Benini , Bruno Ricco', Low Power Control Techniques For TFT LCD Displays, Proceedings of the 2002 international conference on Compilers, architecture, and synthesis for embedded systems, October 08-11, 2002, Grenoble, France [doi>10.1145/581630.581664]
• 2: A. Weissel, M. Faerber, and F. Bellosa, "Application Characterization for Wireless Network Power Management", Proceedings of the International Conference on Architecture of Computing Systems (ARCS'04), March 2004.
• 3: V. Delaluz , A. Sivasubramaniam , M. Kandemir , N. Vijaykrishnan , M. J. Irwin, Scheduler-based DRAM energy management, Proceedings of the 39th conference on Design automation, June 10-14, 2002, New Orleans, Louisiana, USA [doi>10.1145/513918.514095]
• 4: Thomas L. Martin , Daniel P. Siewiorek, Nonideal battery and main memory effects on CPU speed-setting for low power, IEEE Transactions on Very Large Scale Integration (VLSI) Systems, v.9 n.1, p.29-34, Feb. 2001 [doi>10.1109/92.920816]
• 5: Thomas L. Martin , Daniel P. Siewiorek , Asim Smailagic , Matthew Bosworth , Matthew Ettus , Jolin Warren, A case study of a system-level approach to power-aware computing, ACM Transactions on Embedded Computing Systems (TECS), v.2 n.3, p.255-276, August 2003 [doi>10.1145/860176.860178]
• 6: Hojun Shim , Naehyuck Chang , Massoud Pedram, A Backlight Power Management Framework for Battery-Operated Multimedia Systems, IEEE Design & Test, v.21 n.5, p.388-396, September 2004 [doi>10.1109/MDT.2004.43]
• 7: Kinshuk Govil , Edwin Chan , Hal Wasserman, Comparing algorithm for dynamic speed-setting of a low-power CPU, Proceedings of the 1st annual international conference on Mobile computing and networking, p.13-25, November 13-15, 1995, Berkeley, California, United States [doi>10.1145/215530.215546]
• 8: Inseok Choi , Hojun Shim , Naehyuck Chang, Low-power color TFT LCD display for hand-held embedded systems, Proceedings of the 2002 international symposium on Low power electronics and design, August 12-14, 2002, Monterey, California, USA [doi>10.1145/566408.566440]
• 9: Ali Iranli , Hanif Fatemi , Massoud Pedram, HEBS: Histogram Equalization for Backlight Scaling, Proceedings of the conference on Design, Automation and Test in Europe, p.346-351, March 07-11, 2005 [doi>10.1109/DATE.2005.174]
• 10: Wei-Chung Cheng , Chih-Fu Hsu , Chain-Fu Chao, Temporal vision-guided energy minimization for portable displays, Proceedings of the 2006 international symposium on Low power electronics and design, October 04-06, 2006, Tegernsee, Bavaria, Germany [doi>10.1145/1165573.1165595]
• 11: http://www.hp.com
• 12: http://www.intel.com

INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.3 SPECIAL-PURPOSE AND APPLICATION-BASED SYSTEMS
      Subjects: Real-time and embedded systems

General Terms:
Management

Keywords:
LCD, dynamic power management, dynamic voltage scaling, energy management