AMOLED公司
有机发光二极管
阳极
像素
材料科学
薄膜晶体管
阴极
光电子学
有源矩阵
二极管
电压
计算机科学
电气工程
电极
物理
纳米技术
图层(电子)
人工智能
工程类
量子力学
作者
Bahman Hekmatshoar,Alex Z. Kattamis,Kunigunde Cherenack,S. Wagner,James C. Sturm
摘要
Abstract— The direct voltage programming of active‐matrix organic light‐emitting‐diode (AMOLED) pixels with n ‐channel amorphous‐Si (a‐Si) TFTs requires a contact between the driving TFT and the OLED cathode. Current processing constraints only permit connecting the driving TFT to the OLED anode. Here, a new “inverted” integration technique which makes the direct programming possible by connecting the driver n‐channel a‐Si TFT to the OLED cathode is demonstrated. As a result, the pixel drive current increases by an order of magnitude for the same data voltages and the pixel data voltage for turn‐on drops by several volts. In addition, the pixel drive current becomes independent of the OLED characteristics so that OLED aging does not affect the pixel current. Furthermore, the new integration technique is modified to allow substrate rotation during OLED evaporation to improve the pixel yield and uniformity. The new integration technique is important for realizing active‐matrix OLED displays with a‐Si technology and conventional bottom‐anode OLEDs.
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