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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 9, Iss. 5 — May. 1, 2013
  • pp: 388–395

Analysis and Suppression of Overcurrent in Boost LED Drivers

Yuan-Ta Hsieh and Ying-Zong Juang

Journal of Display Technology, Vol. 9, Issue 5, pp. 388-395 (2013)


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Abstract

Light-emitting diodes (LEDs) are the major backlighting source used in liquid crystal displays and dimming the LEDs is a common approach to increase the contrast ratio or save power. Pulse-width modulation (PWM) is more popular than analog methods of dimming, because it produces a less pronounced shift in chromaticity. However, in PWM dimming mode, overcurrent can shorten the lifespan of the LEDs. This paper proposes a technique to overcome the drawbacks inherent in conventional approaches to the suppression of overcurrent in LED devices. The design was implemented using the TSMC 0.25-µm 60-V bipolar-CMOS-DMOS process, resulting in a chip area of 2.2 mm2. A comparison with two commercial chips demonstrates the effectiveness of the proposed design in the suppression of LED overcurrent and the subsequent extension of the lifespan.

© 2013 IEEE

Citation
Yuan-Ta Hsieh and Ying-Zong Juang, "Analysis and Suppression of Overcurrent in Boost LED Drivers," J. Display Technol. 9, 388-395 (2013)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-9-5-388


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