文档介绍：上海交通大学
硕士学位论文
有机发光显示器驱动电路研究
姓名:郭英英
申请学位级别:硕士
专业:@
指导教师:李荣玉
20081201
有机发光显示器驱动电路研究

摘要
自从有机发光二极管 OLED 于 1979 年被发现以来,世界各地的研
究组织就一直对它进行研究。随着研究的深入,以 OLED 为发光器件
的各种显示设备逐渐进入量产。以索尼,三星为代表的显示器件的厂
商生产大屏幕的 OLED 显示器,并逐步将 OLED 的应用领域扩大,中国
清华大学的研究人员将 OLED 用于航天事业。本文正是在这样的背景
下,对有机发光显示器进行研究。
本文主要研究了 OLED 的灰度实现方案以及 OLED 的像素电路。在
现有灰度方案的基础上,提出了面积比率灰度结合比率电流的灰度实
现方案,通过与面积比率灰度的比较,可以发现这种灰度实现方法可
以实现更多级的灰度。本文同时对子场比率灰度实现方案进行了仿
真,采用本文提出的 4-TFT 的 AMOLED 像素电路作为仿真电路,用
Hspice 软件仿真实现了 4-TFT AMOLED的子场灰度实现。考虑到 2-TFT
AMOLED 像素驱动电路中,阈值电压的变化对流过 OLED 电流的影响,
以及电压驱动方式带来的难于实现精确的灰度控制,本文提出了
4-TFT 的像素驱动电路,仿真证明该电路解决了上述 2-TFT AMOLED
像素驱动电路中出现的问题。

关键词: OLED,灰度,像素驱动电路,TFT,Hspice,AMOLED
V
STUDY ON DRIVING CIRCUIT ANIC LIGHT
EMITTING DISPLAY

ABSTRACT
anic Light Emitting Diode OLED was discovered in 1979,
a lot of anizations have been working hard on it. As research
is developing, many kinds of display equipments have been manufactured
in factories. Manufacturers, such as Sony, Samsung,made big-screen
OLED display recently. Meanwhile, they have planned to widen
application fields of OLED. Researchers in Tsinghua University used
OLED in spaceflight in 2008. In such situation, the paper has been
written.
The paper focuses on gray scale modulation and pixel driving circuit
of OLED. Based on convention gray scale modulation, we put forward a
novel gray scale modulation, combining Area Ratio Gray Scale
modulation with ratio current. Compared with Area Ratio Gray scale, the
new way can achieve more gray scales. In the paper, we also simulate
Sub-field gray scale modulation using a novel 4-TFT AMOLED pixel
driving circuit with software Hspice. Conventional 2-TFT AMOLED
pixel driving circuit has some defects, such as current through OLED is
VI
affected by threshold voltage of driving TFT and gray scale is hard to be
controlled accurately. Considering that, we design a novel pixel driving
circuit with 4-TFT. The results of simulati