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A PDM-Based Digital Driving Technique Using Delta-Sigma ( \Delta \Sigma ) Modulation for QVGA Full-Color AMOLED Display Applications

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5 Author(s)
Jae Hyuk Jang ; Dept. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA ; Minho Kwon ; Tjandranegara, E. ; Kwyro Lee
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We propose a digital driving technique using pulse-density modulation (PDM) for an active-matrix organic light-emitting diode (AMOLED) to effectively suppress the false image contour in conventional pulsewidth modulation (PWM) while achieving considerably low operating frequency. A compact first-order digital ΔΣ modulator provides the PDM signal to the panel. A 2.2-inch QVGA AMOLED system using the proposed technique shows no false image contour problem while allowing relaxed minimum gate scan time.

Published in:

Display Technology, Journal of  (Volume:6 ,  Issue: 7 )

Date of Publication:

July 2010

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