NDLI: Ulrich Barnhoefer, Moon-Jung Kim, and Mattan Erez A Low Power, Passively Cooled 2000 $cd/m^{2}Hybrid$ LED-LCD Display

Content Provider	IEEE Xplore Digital Library
Author	Barnhoefer, U. Kim, M.-J. Erez, M.
Copyright Year	2006
Description	Author affiliation: Stanford Univ., CA (Barnhoefer, U.; Kim, M.-J.; Erez, M.)
Abstract	In this paper, we describe a hybrid LED-LCD screen that delivers the same image peak-brightness at 1/2 to 1/20th the power consumption per unit LCD screen area compared to conventional designs. Our architecture is based on an adaptive, spatially controlled LED backlight and a unique algorithm that decomposes the displayed image into LED and LCD components in order to minimize power consumption. In addition to the efficiency gained over current displays, our implementation is also suited for high dynamic range applications, achieving a peak brightness of 2000 $cd/m^{2}$ with a 20,000:1 contrast ratio. We introduce, for the first time, implementation details of a spatially adaptive LED-LCD display and describe a novel thermal and electrical design. Our display is comprised of a standard FR4 PCB populated with an array of individually controlled high brightness LEDs, their associated control electronics mounted, and a LCD panel. The use of standard PCB (no metal core) is made possible by carefully designing efficient driver electronics (76% efficiency), introducing thermal channels to a large integrated heat sink implemented as part of the PCB, and employing power-reducing decomposition algorithms. Our prototype is completely passively air cooled, silent, and light
Starting Page	1
Ending Page	4
File Size	1240199
Page Count	4
File Format	PDF
ISBN	1424402166
DOI	10.1109/ISCE.2006.1689480
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-28
Publisher Place	Russia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Liquid crystal displays Energy consumption Light emitting diodes Brightness Programmable control Adaptive control Dynamic range Algorithm design and analysis Driver circuits Thermal decomposition High Dynamic Range Display Backlight Low-Power Thermal Management LED LCD
Content Type	Text
Resource Type	Article

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Ulrich Barnhoefer, Moon-Jung Kim, and Mattan Erez A Low Power, Passively Cooled 2000 cd/m2Hybrid LED-LCD Display

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Ulrich Barnhoefer, Moon-Jung Kim, and Mattan Erez A Low Power, Passively Cooled 2000 $cd/m^{2}Hybrid$ LED-LCD Display

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