Electrophoretic Display Power and Mobile Computing Devices Michael A. Baker March 4, 2007 CSE 591...
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Transcript of Electrophoretic Display Power and Mobile Computing Devices Michael A. Baker March 4, 2007 CSE 591...
Electrophoretic Display Power and Mobile Computing Devices
Michael A. BakerMarch 4, 2007
CSE 591 Low Power Computer ArchitectureInstructor: Aviral Shrivastava
2
Agenda
• Introduction
• Mobile computing device displays
• Electrophoretic displays
• LCD power management schemes
• Power modeling
• References
• Timeline
3
Mobile Computing Device Display Technologies
Mobile Computing Device Display Technologies
Non-EmissiveEmissive
OLED(Organic Light Emitting Diode)
SRD(Scanning Retinal
Displays)
PLED(Polymer based
OLED)
SMOLED(Polymer based
OLED)
ElectrophoreticLCD
(Liquid Crystal Display)
Active Matrix Passive Matrix
IMOD(Inferometric Modulator)
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LCD power management schemes/applicability to EPDs
• Concurrent Brightness and Contrast Scaling (CBCS)
• Graphical User Interface optimization
• Variable Dot Clock Scaling
• Variable Frame Refresh
• Multiplexed driver optimization
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EPD and LCD Modeling
TFT pixel equivalent circuit from Low Power Control Techniques For TFT LCD Displays, 2002
EPD addressing scheme from An Electrophoretic Display, Its Properties, Model, and Addressing, 1979
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Power Calculation for Multiplexed LCD
• Equations from [6] enabling power estimation for a multiplexed display with pixels modeled as capacitors
• Power given is for the display drawn once
10
Primary References
• [1] Pedram, Cheng, Hou, Power Minimization in a Backlit TFT-LCD Display by Concurrent Brightness and Contrast Scaling, 2004
• [2] Herz, Electrophoretic Display technology: The beginnings, the improvements, and a future in flexible electronics, May 19, 2006
• [3] Zhong, Jha, Graphical User Interface Energy Characterization for Handheld Computers, October 2003
• [4] Dalisa, Electrophoretic Display Technology, 1977• [5] Gatti, Acquaviva, Benini, Ricco’, Low Power Control Techniques For
TFT LCD Displays, 2002• [6] Marks, Power Consumption in Multiplexed Liquid-Crystal Displays,
1982