Global OLED Technology Assigned Patent
(Targeted News Service Via Acquire Media NewsEdge) By Targeted News Service
ALEXANDRIA, Va., Jan. 26 -- Global OLED Technology, Herndon, Va., has been assigned a patent (8,358,256) developed by John W. Hamer, Rochester, N.Y., Gary Parrett, Rochester, N.Y., and Charles I. Levey, West Henrietta, N.Y., for a "compensated drive signal for electroluminescent display."
The abstract of the patent published by the U.S. Patent and Trademark Office states: "Compensation is performed for initial nonuniformity or aging of drive transistors and electroluminescent (EL) emitters in 3T1C EL subpixels of an EL display, such as an organic light-emitting diode (OLED) display. A readout transistor connected to the EL emitter is used to readout the voltage of the emitter and compensation for .DELTA.V.sub.th, .DELTA.V.sub.EL, and OLED efficiency loss is performed using a model. Measurements are taken during a frame by driving a target subpixel at a higher luminance for a shorter time, then using the remaining time in the frame to measure. Measurements can be taken with an A/D converter or with a ramp generator and comparator. Compensation is performed for each subpixel individually."
The patent application was filed on Nov. 17, 2008 (12/272,222). The full-text of the patent can be found at http://patft.uspto.gov/netacgi/nph-Parser Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8,358,256.PN.&OS=PN/8,358,256&RS=PN/8,358,256
Written by Kusum Sangma; edited by Anand Kumar.
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