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Design of an Improved Data Signal Timing for an Amorphous Silicon Active-Matrix Organic LED Display

机译：非晶硅有源矩阵有机LED显示器的改进数据信号时序设计

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The most critical issue in the design of an active matrix organic light emitting diode (AM-OLED) display pixel is the pixel to the pixel luminance uniformity. By substituting four-thin film transistor (TFT) pixel circuit for two-TFT pixel circuit, the luminous uniformity has great improved, but it requires more components than the two-TFT pixel circuit. There are some barriers needed to resolve to utilize hydrogenated amorphous silicon transistor to lit OLED, such as low field effect mobility, low output current and threshold voltage shift. In this article, a two-a-Si:H TFT pixel circuit was designed, which consisted of one named switching TFT and the other named driving TFT. The driving TFT gate line structure modified and a data signal timing improved were reported. The modified driving TFT can provide enough current about 30 microampere to lit OLED and the novel data signal timing can provide a constant current to OLED by restraining the driving TFT threshold voltage variation. In the novel data signal timing, the control signals to the driving TFT gate include a data signal and a reverse data signal. The signals alteration is performed either at a frame rate or at a line rate. By experiments, the driving TFT output current value is plotted as a function of the time in different reversed voltage value. When the magnitude of the positive data signal and the negative data signal is equal, the variety of ΔV_(th) is smallest, about 1.28V after a fixed stressing time of 1.33 X 10~4min, which shows the novel data signal timing can improved the driving TFT output-input current stability.
机译：有源矩阵有机发光二极管（AM-OLED）显示像素设计中最关键的问题是像素到像素的亮度均匀性。通过用四薄膜晶体管（TFT）像素电路代替两TFT像素电路，虽然发光均匀性得到了很大的提高，但与两TFT像素电路相比，它需要更多的组件。解决利用氢化非晶硅晶体管来点亮OLED需要解决一些障碍，例如低场效应迁移率，低输出电流和阈值电压漂移。本文设计了一种2a-Si：H TFT像素电路，该电路由一个名为开关TFT和另一个称为驱动TFT组成。报告了改进的驱动TFT栅极线结构和改善了数据信号时序。修改后的驱动TFT可以提供足够的电流（约30微安）来点亮OLED，并且新颖的数据信号时序可以通过限制驱动TFT阈值电压变化为OLED提供恒定电流。在新颖的数据信号定时中，到驱动TFT栅极的控制信号包括数据信号和反向数据信号。信号改变以帧速率或线速率执行。通过实验，在不同的反向电压值下，将驱动TFT输出电流值绘制为时间的函数。当正数据信号和负数据信号的大小相等时，ΔV_（th）的变化最小，经过固定的1.33 X 10〜4min的应力时间后约为1.28V，这表明可以改善新型数据信号的时序驱动TFT输出输入电流的稳定性。

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