金属氧化物TFT柔性行驱动电路研究

Flexible active matrix organic light-emitting diode (AMOLED ) display is thought as the mainstream technology of flexible display due to advantages of all solid-state process and ultra-thin thickness. Metal oxide thin film transistors (MO TFTs) have high mobility and low process tempture, which are a promising TFTs technology of next generation. Integrating the gate driver in the flexible display based on MO TFT technology can not only enhance the reliability but also lower the cost of IC. In this project, we will mainly study the metal oxide TFTs gate driver circuit for the flexible AMOLED display applications and the metal oxide TFTs compact model for circuit simulation design.The below scientific problems should be solved: design of high stability,low power consumption and high speed for the gate driver integrated by TFTs, signals integrity of system integration, and the trade-off between characterization of metal oxide TFTs physical effects and applicability of circuit simulation in the metal oxide TFTs compact modeling. Finally, the flexible AMOLED display integrating gate driver is realized based on the advanced technology foundation of flexible metal oxide TFTs back panel. And then, we hope to generalize the general technologies of flexible electronic system.

柔性有源矩阵有机发光二极管显示(AMOLED)具有全固态、超轻薄等特点，被认为是未来柔性显示的主流技术。金属氧化物薄膜晶体管(TFT)迁移率较高、可低温制备，是最有希望的下一代薄膜晶体管之一。利用金属氧化物TFT技术在柔性AMOLED显示面板上直接集成行驱动电路，能够增强柔性显示的可靠性并节省芯片成本。本申请课题主要研究面向柔性AMOLED显示应用的金属氧化物TFT行驱动电路和面向电路仿真设计的金属氧化物TFT紧致模型。拟解决以下关键科学问题：TFT集成柔性行驱动电路的高可靠性、低功耗和高速度设计，系统集成中的信号完整性，紧致模型在反映TFT物理过程与适用电路仿真之间的平衡考虑。最终，在良好的柔性TFT背板技术基础上，实现柔性AMOLED显示与柔性TFT行驱动电路的系统级集成，并凝练柔性电子系统的共性技术。

基于柔性金属氧化物TFT器件特性，以电容-电压特性作为切入点研究了氧化物TFT陷阱态的物理响应模型，研究设计面向柔性AMOLED显示应用的TFT行驱动电路拓扑，重点开展了单一负电源和集成发光控制的行驱动电路拓扑研究，实现窄边框、低功耗、高速度的设计目的。在良好的柔性TFT背板技术基础上，制备柔性行驱动电路并测试其性能，实现柔性AMOLED显示（200RGB*600,282PPI）与柔性TFT行驱动电路的系统级集成，从版图设计、应力仿真和长时间弯曲测试等方面探讨了柔性电子系统的共性技术。另外，行驱动电路拓扑研究及其集成设计还应用于有源PWM驱动的Micro LED 显示中，实现Micro LED 显示（76 × BBB × 78）的系统级集成。