Classification of Driving Methods for TFT-OLEDs and Novel Proposal Using Time Ratio Grayscale and Current Uniformization

Mutsumi KIMURA  Yuji HARA  Hiroyuki HARA  Tomoyuki OKUYAMA  Satoshi INOUE  Tatsuya SHIMODA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.11    pp.2043-2050
Publication Date: 2005/11/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.11.2043
Print ISSN: 0916-8516
Type of Manuscript: REVIEW PAPER
Category: 
Keyword: 
classification,  driving method,  TFT-OLED,  time-ratio grayscale,  current uniformization,  

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Summary: 
Driving methods for TFT-OLEDs are explained with their features and classified from the viewpoints of grayscale methods and uniformizing methods. This classification leads us to a novel proposal using time ratio grayscale and current uniformization. This driving method maintains current uniformity and simultaneously overcomes charging shortage of the pixel circuit for low grayscale levels and current variation due to the shift of operating points. Tolerance toward degraded characteristics, linearity of grayscale and luminance uniformity against degraded characteristics are confirmed using circuit simulation.