PM-OLED驱动中的分场显示问题研究  

Driving Method of Sub-frame and Current-ratio for PM-OLED

作　　者：郭斌[1] 吴春亚[1] 熊绍珍[1] 张丽珠[2] 

机构地区：[1]南开大学光电子薄膜器件与技术研究所,天津300071 [2]天津机电工业学校,天津300071

出　　处：《液晶与显示》2002年第3期182-188,共7页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金资助项目 ( 6 9876 0 2 2 ;6 0 0 770 1 1 ;6 990 70 0 2 )

摘　　要：提出了一种比率电流 +分场的概念 ,结合电流比率加分场的方法 ,设计了一种电流移位 (复用 )的驱动方法。这种电流比率 +电流移位的方法比现有的脉宽调制 (PWM )法结构简单、时序简化 ,容易电路集成。既保留PM OLED低成本的优点又达到较高的灰度级显示 ,避免使用大的电流驱动。用较少的分级电流 (4个成比例电流 )实现较高的灰度级 (1 6级 ) ,实现了数字化显示 ,电流信号还可以避免串扰的影响。Driving method of a sub-frame current mode and circuit for the PM-OLED is presen-ted.A driving circuit with four groups of current sources was designed,which can drive a 64×64 panel. There are totally 64 proportional current sources and each group represents the gray scale of 1,2,4,8.The whole frame is divided into four equal sub-frames. In each sub-frame the currents passing through one OLED is one of the proportional currents. As different current passes through the OLED in different sub-frames, it can achieve 16 gray scales from 0000 through 1111(from 0 through 15). In order to get higher gray scale, one can simply add more proportional current sources and divide the frame into more equal sub-frames. This method can also be used in the AM-OLED.

关 键 词：OLED 分场显示 被动矩阵 数字化驱动 电流比率 电流移位 有机发光二极管 

分 类 号：TN312.8[电子电信—物理电子学] TN873.3