Improvement of Brightness Uniformity by AC Driving Scheme for AMOLED Display

Y.-C. Lin, H.-P.D. Shieh
2004 IEEE Electron Device Letters  
We propose an ac voltage driving scheme which can improve the brightness uniformity of active-matrix organic lightemitting diode (AMOLED) displays. Through the use of a charge feed-through mechanism and an ac driving voltage, the voltage drop caused by the parasitic resistance can be compensated. A 2.2 in AMOLED panel with a resolution of 176 RGB 220 has been fabricated by low temperature polycrystalline silicon technology to evaluate the performance of the ac driving scheme. Experimental
more » ... s show that a brightness uniformity of higher than 91.6%, achieved by the ac driving scheme, in contrast to that of 74% achieved by a dc driving scheme. Index Terms-AC driving, active-matrix (AM), AMOLED, lightemitting diode (LED), thin-film transistor (TFT), uniformity.
doi:10.1109/led.2004.837535 fatcat:kzbgrszw5vblrkpxtfuvdzz3n4