High‐speed pixel circuits for large‐sized 3‐D AMOLED displays
High‐speed pixel circuits for large‐sized 3‐D AMOLED displays
复制标题
DOI：
10.1889/jsid19.4.329
复制
发表时间：
2011-04
影响因子：
2.3
通讯作者：
Dong-Wook Park;C. Kang;Yongsung Park;Bo-Yong Chung;K. Chung;Keum‐nam Kim;Byung‐hee Kim;Sang Soo Kim
中科院分区：
文献类型：
--
作者：
Dong-Wook Park;C. Kang;Yongsung Park;Bo-Yong Chung;K. Chung;Keum‐nam Kim;Byung‐hee Kim;Sang Soo Kim
摘要-大尺寸有源矩阵有机发光二极管（AMOLED）显示器需要高帧率驱动技术来实现高质量的3D图像。然而，更高的帧速率驱动减少了像素电路中可用于补偿Vth的时间。因此，需要开发一种新的方法来在更短的时间间隔内补偿像素电路。在这项工作中，图像质量为14英寸。研究了以超过240 Hz的帧速率驱动的四分之一全高清（qFHD）AMOLED。发现图像劣化与可用于补偿驱动TFT阈值电压的时间有关。为了解决这个问题，提出了用于高速操作的新型AMOLED像素电路，以在高于240 Hz的帧速率下补偿阈值电压变化。当Vth变化超过±1.0 V时，传统像素电路在240 Hz和480 Hz下分别显示出22.8%和39.8%的电流偏差，而新像素电路仅显示出2.6%和5.4%的偏差。
Abstract— Large‐sized active‐matrix organic light‐emitting diode (AMOLED) displays require high‐frame‐rate driving technology to achieve high‐quality 3‐D images. However, higher‐frame‐rate driving decreases the time available for compensating Vth in the pixel circuit. Therefore, a new method needs to be developed to compensate the pixel circuit in a shorter time interval. In this work, image quality of a 14‐in. quarter full‐high‐definition (qFHD) AMOLED driven at a frame rate of over 240 Hz was investigated. It was found that image degradation is related to the time available for compensation of the driving TFT threshold voltage. To solve this problem, novel AMOLED pixel circuits for high‐speed operation are proposed to compensate threshold‐voltage variation at frame rates above 240 Hz. When Vth is varied over ±1.0 V, conventional pixel circuits showed current deviations of 22.8 and 39.8% at 240 and 480 Hz, respectively, while the new pixel circuits showed deviations of only 2.6 and 5.4%.