Page 1 |
Save page Remove page | Previous | 1 of 123 | Next |
|
small (250x250 max)
medium (500x500 max)
large ( > 500x500)
Full Resolution
All (PDF)
|
This page
All
Subset |
THERMAL MANAGEMENT IN MICROPROCESSOR CHIPS AND DYNAMIC
BACKLIGHT CONTROL IN LIQUID CRYSTAL DIAPLAYS
by
Wonbok Lee
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
August 2008
Copyright 2008 Wonbok Lee
Object Description
| Title | Thermal management in microprocessor chips and dynamic backlight control in liquid crystal diaplays |
| Author | Lee, Wonbok |
| Author email | wonbokle@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2008-05-14 |
| Date submitted | 2008 |
| Restricted until | Unrestricted |
| Date published | 2008-07-31 |
| Advisor (committee chair) | Pedram, Massoud |
| Advisor (committee member) |
Draper, Jeffrey Nakano, Aiichiro |
| Abstract | The desire for the low power dissipation in the electronic systems and the ensuring thermal safety for the microprocessor chips have brought about a paradigm shift from the traditional performance-oriented design to the power-temperature-oriented one. To address some of the critical problems arising from this paradigm shift, this dissertation introduces a number of low-power design and temperature control strategies. The first part of the dissertation presents three dynamic thermal management (DTM) techniques for the microprocessor chips. The first technique, which is targeted to MPEG-2 decoding, allows some degree of spatiotemporal quality degradation in the video stream to ensure that the die temperature stays in a safe range. The second DTM technique, which specifically targets the register file, periodically switches the load/store operations from one register file bank to another in order to keep the register file temperature below a critical threshold. The third DTM technique, which is again targeted at MPEG-2 decoders, is based on (i) accurate estimation of the workload caused by various frames in a Group Of Pictures (GOP), (ii) slack borrowing across the GOP frames, (iii) employing Dynamic Voltage and frequency scaling (DVFS) while considering the frame-rate-dependent GOP deadline, variance of the frame decoding times within the GOP, and a maximum chip temperature constraint.; The second part of this dissertation presents three low-power and quality-aware backlight control techniques for LCDs. First, a temporally-aware backlight scaling technique for video is presented, which considers spatiotemporal image/video quality in the backlight scaling domain based upon some characteristics of the Human Visual System (HVS). The proposed technique attempts to minimize the spatiotemporal distortion in the perceived brightness between the original and the backlight-scaled videos while maximizing the energy savings in a Liquid Crystal Display (LCD) with Cold Cathode Fluorescent Lamp (CCFL) backlight. Next, a two-D Light Emitting Diode (LED) backlight scanning and a local LED dimming technique are presented. Considering the visual persistence of HVS and the response time of LCs/LEDs, the proposed scanning technique controls the ON/OFF period of the LED backlights, achieving a significant reduction in the motion blur artifact. In addition, the proposed LED local dimming technique controls the local luminance in the LCD screen by modulating the LED backlights, enhancing the static contrast ratio of the image frame. |
| Keyword | backlight scanning; backlight local dimming; dynamic thermal management; low power |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Type | texts |
| Legacy record ID | usctheses-m1477 |
| Rights | Lee, Wonbok |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Lee-20080731 |
| Archival file | uscthesesreloadpub_Volume44/etd-Lee-20080731.pdf |
Description
| Title | Page 1 |
| Full text | THERMAL MANAGEMENT IN MICROPROCESSOR CHIPS AND DYNAMIC BACKLIGHT CONTROL IN LIQUID CRYSTAL DIAPLAYS by Wonbok Lee A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) August 2008 Copyright 2008 Wonbok Lee |
Comments
Post a Comment for Page 1
