有机电致发光驱动芯片及电路设计

【作者】 何其锐；

【导师】 张义德；

【作者基本信息】 电子科技大学 ， 物理电子学， 2003， 硕士

【摘要】 有机电致发光器件（OLED）采用有机薄膜作为发光层，能够在低驱动电压下，产生强烈的电光效应。自1987年以来，OLED获得了飞速的发展，并很有希望成为下一代显示器的主导。本论文工作主要包括有机电致发光器件驱动芯片和驱动电路的设计。本文先回顾了有机电致发光器件的基本结构，有机电致发光的基本原理，介绍了目前国内对OLED的驱动显示所做的一些研究，也分析了目前关于OLED专用驱动芯片的工作过程。了解了502教研室曾经对OLED实测的电流密度、电压、亮度相关数据，分析了它们之间的关系。在已有的LED驱动电路的改进下成功的实现了对3232无源OLED矩阵直流驱动下的动态显示。根据有机电致发光的机理，设计了交流驱动的控制芯片的软件和驱动电路，并且对交流驱动的波形实现了驱动频率的可调，驱动波形的占空比可调的灵活的软件设计。为了减小了显示系统在灰度初始输出时间对电流供应的集中需求，在参考相关专利后，更改了专利中提及的一些比较器的函数关系，在波形仿真上实现了OLED显示数据8级灰度的移位调制输出。综合交流驱动和灰度移位调制输出的设计思路，最后实现了可调脉宽灰度移位调制交流驱动芯片软件的设计，在高达50MHz的时钟下，仿真波形工作正常。最后论文就OLED器件的设计和调试方案给出了一些建议。更多还原

【Abstract】 The basic organic light-emitting device (OLED) consists of a number of ultra-thin organic layers between two electrodes. Under low applied voltage, the recombination of carriers coming from cathode and anode can produce intense light output. Since 1987, OLED has received much attention and now are beginning to enter the display markets where they may eventually be the dominant flat panel display devices.This thesis mainly discusses the driving chip and driver for the OLED.In this dissertation, first of all, it takes a review of the concepts and theories describing the mechanisms of organic electro-luminescence , and introduces some interior research about the driving circuit for the passive matrix OLED. We have analyzed the working process of the OLED driving chip, and the relationship among the luminance, voltage and the density of current. We had modified the driver of LED and realized driving the passive matrix OLED of 3232 panel by direct current driving.Based on the OLED luminescent theory, we have designed the software of driving chip and driver by alternating current driving method. The driving plus’s frequency and duty cycle can be changed by the software.We have designed a software about eight level gray-scale plus shifting modulation. It can prevent the output timing of the column driving signal from coinciding at neighboring columns, eases the concentration of supply current, and reduces power consumption, Integrate the idea of alternating current driven method and gray-scale plus shifting modulation, we designed the software which includes both of the functions for OLED driving chip. The software can work successfully under 50MHz clock in simulation.At last this thesis gives some advices about the design of the OLED’s structure and the debugging scheme of the OLED’s driver.更多还原