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Current programming pixel circuit and data‐driver design for active‐matrix organic light‐emitting diodes
Author(s) -
Lee JaeHoon,
Nam WooJin,
Jung SangHoon,
Han MinKoo
Publication year - 2004
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1821298
Subject(s) - thin film transistor , active matrix , oled , pixel , optoelectronics , amoled , materials science , computer science , diode , capacitor , transistor , threshold voltage , voltage , electrical engineering , artificial intelligence , nanotechnology , engineering , layer (electronics)
— We propose a new pixel design for active‐matrix organic light‐emitting diodes (AMOLEDs) employing five polycrystalline thin‐film transistors (poly‐Si TFTs) and one capacitor, which decreases the data current considerably in order to reduce the charging time compared with that of conventional current‐mirror structures. Also, the new pixel design compensates the threshold‐voltage degradation of OLEDs caused by continuous operation and the non‐uniformity of poly‐Si TFTs due to excimer‐laser annealing. The proposed pixel circuit was verified by SPICE simulation, based on measured TFT and OLED characteristics. We also propose current‐data‐driver circuitry that reduces the number of shift‐register signals for addressing the current data driver by one‐half.