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LED Backlight Driving System for Large-Scale LCD Panels

This paper presents an LED backlight driving system for large-scale liquid crystal display panels. High efficiency, high power factor, circuit simplicity, and low cost can be achieved by using a single-stage charge-pump asymmetrical half-bridge converter. To regulate the LED current and brightness f...

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Published in:	IEEE transactions on industrial electronics (1982) 2007-10, Vol.54 (5), p.2751-2760
Main Authors:	Chiu, Huang-Jen, Cheng, Shih-Jen
Format:	Article
Language:	English
Subjects:	Arrays Backlights Brightness Bypass diode Charge pumps Circuits Costs Current sharing dimming control Driving Laboratories Large-scale systems Light emitting diodes light-emitting diode (LED) backlight Liquid crystal displays Luminance Panels power factor Prototypes Reactive power single-stage charge-pump asymmetrical half-bridge (AHB)
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cites	cdi_FETCH-LOGICAL-c383t-fa5e75f1d7b63f75019bbbf5d6247f6635d2db630979b5c9eec9340610699ba23
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container_title	IEEE transactions on industrial electronics (1982)
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creator	Chiu, Huang-Jen Cheng, Shih-Jen
description	This paper presents an LED backlight driving system for large-scale liquid crystal display panels. High efficiency, high power factor, circuit simplicity, and low cost can be achieved by using a single-stage charge-pump asymmetrical half-bridge converter. To regulate the LED current and brightness for the LED backlight system, some current sharing methods are presented and compared. The requirements for the current sharing and luminance balance among paralleled LED arrays can be satisfied while current ripple is eliminated significantly. Because of the addition of bypass diodes, an alternative current path can be offered when a single LED fails. The LED array will not be extinguished. Reliability of the LED backlight system can thus be improved effectively. A laboratory prototype has been built and tested. The simulation and experimental results are shown to verify the feasibility of the proposed method.
doi_str_mv	10.1109/TIE.2007.899938
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High efficiency, high power factor, circuit simplicity, and low cost can be achieved by using a single-stage charge-pump asymmetrical half-bridge converter. To regulate the LED current and brightness for the LED backlight system, some current sharing methods are presented and compared. The requirements for the current sharing and luminance balance among paralleled LED arrays can be satisfied while current ripple is eliminated significantly. Because of the addition of bypass diodes, an alternative current path can be offered when a single LED fails. The LED array will not be extinguished. Reliability of the LED backlight system can thus be improved effectively. A laboratory prototype has been built and tested. The simulation and experimental results are shown to verify the feasibility of the proposed method.</description><identifier>ISSN: 0278-0046</identifier><identifier>EISSN: 1557-9948</identifier><identifier>DOI: 10.1109/TIE.2007.899938</identifier><identifier>CODEN: ITIED6</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>Arrays ; Backlights ; Brightness ; Bypass diode ; Charge pumps ; Circuits ; Costs ; Current sharing ; dimming control ; Driving ; Laboratories ; Large-scale systems ; Light emitting diodes ; light-emitting diode (LED) backlight ; Liquid crystal displays ; Luminance ; Panels ; power factor ; Prototypes ; Reactive power ; single-stage charge-pump asymmetrical half-bridge (AHB)</subject><ispartof>IEEE transactions on industrial electronics (1982), 2007-10, Vol.54 (5), p.2751-2760</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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High efficiency, high power factor, circuit simplicity, and low cost can be achieved by using a single-stage charge-pump asymmetrical half-bridge converter. To regulate the LED current and brightness for the LED backlight system, some current sharing methods are presented and compared. The requirements for the current sharing and luminance balance among paralleled LED arrays can be satisfied while current ripple is eliminated significantly. Because of the addition of bypass diodes, an alternative current path can be offered when a single LED fails. The LED array will not be extinguished. Reliability of the LED backlight system can thus be improved effectively. A laboratory prototype has been built and tested. 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(IEEE)</general><scope>97E</scope><scope>RIA</scope><scope>RIE</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>8FD</scope><scope>L7M</scope><scope>F28</scope><scope>FR3</scope></search><sort><creationdate>20071001</creationdate><title>LED Backlight Driving System for Large-Scale LCD Panels</title><author>Chiu, Huang-Jen ; Cheng, Shih-Jen</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c383t-fa5e75f1d7b63f75019bbbf5d6247f6635d2db630979b5c9eec9340610699ba23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Arrays</topic><topic>Backlights</topic><topic>Brightness</topic><topic>Bypass diode</topic><topic>Charge pumps</topic><topic>Circuits</topic><topic>Costs</topic><topic>Current sharing</topic><topic>dimming control</topic><topic>Driving</topic><topic>Laboratories</topic><topic>Large-scale systems</topic><topic>Light emitting diodes</topic><topic>light-emitting diode (LED) backlight</topic><topic>Liquid crystal displays</topic><topic>Luminance</topic><topic>Panels</topic><topic>power factor</topic><topic>Prototypes</topic><topic>Reactive power</topic><topic>single-stage charge-pump asymmetrical half-bridge (AHB)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chiu, Huang-Jen</creatorcontrib><creatorcontrib>Cheng, Shih-Jen</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 2005-present</collection><collection>IEEE All-Society Periodicals Package (ASPP) 1998–Present</collection><collection>IEEE/IET Electronic Library (IEL)</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><jtitle>IEEE transactions on industrial electronics (1982)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chiu, Huang-Jen</au><au>Cheng, Shih-Jen</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>LED Backlight Driving System for Large-Scale LCD Panels</atitle><jtitle>IEEE transactions on industrial electronics (1982)</jtitle><stitle>TIE</stitle><date>2007-10-01</date><risdate>2007</risdate><volume>54</volume><issue>5</issue><spage>2751</spage><epage>2760</epage><pages>2751-2760</pages><issn>0278-0046</issn><eissn>1557-9948</eissn><coden>ITIED6</coden><abstract>This paper presents an LED backlight driving system for large-scale liquid crystal display panels. High efficiency, high power factor, circuit simplicity, and low cost can be achieved by using a single-stage charge-pump asymmetrical half-bridge converter. To regulate the LED current and brightness for the LED backlight system, some current sharing methods are presented and compared. The requirements for the current sharing and luminance balance among paralleled LED arrays can be satisfied while current ripple is eliminated significantly. Because of the addition of bypass diodes, an alternative current path can be offered when a single LED fails. The LED array will not be extinguished. Reliability of the LED backlight system can thus be improved effectively. A laboratory prototype has been built and tested. The simulation and experimental results are shown to verify the feasibility of the proposed method.</abstract><cop>New York</cop><pub>IEEE</pub><doi>10.1109/TIE.2007.899938</doi><tpages>10</tpages></addata></record>
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subjects	Arrays Backlights Brightness Bypass diode Charge pumps Circuits Costs Current sharing dimming control Driving Laboratories Large-scale systems Light emitting diodes light-emitting diode (LED) backlight Liquid crystal displays Luminance Panels power factor Prototypes Reactive power single-stage charge-pump asymmetrical half-bridge (AHB)
title	LED Backlight Driving System for Large-Scale LCD Panels
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