In this paper, an internal-circuit-compensation technique is proposed to improve the threshold-variation in the pixel circuit design using OTFTs for Flexible-displays. This pixel circuit design consists of six-transistors and two-storage-capacitors (6T2C), wherein five-transistors are used as the switching elements and one-transistor is employed as driver. The proposed pixel-circuit is capable not only to compensate the threshold-variations of driving thin-film-transistors (TFTs) efficiently but also to overcome the issue of mobility-variation-degradations of the circuit caused by the large-current-error. Additionally, two-conventional-transistors-one capacitor (2T1C) based pixel-circuit is analyzed and compared with the proposed 6T2C pixel-circuit as well. The obtained results indicate that the average ​- ​value of the current-error-rate is of 6.3% as the threshold-voltage varies by ±0.03 ​V, which is much lower than that of the conventional-2T1C-pixel-circuit. The maximum OLED current of the proposed-pixel-circuit is 2.45 ​μA that can be efficiently used in the small-screen-displays. Furthermore, the proposed-circuitry is analyzed to reduce the impact of the mobility-variation on the performance of the OLED-current to improve the display-performance.

在本文中，提出了一种内部电路补偿技术，以改善使用OTFT进行柔性显示的像素电路设计中的阈值变化。该像素电路设计由六个晶体管和两个存储电容器（6T2C）组成，其中五个晶体管用作开关元件，一个晶体管用作驱动器。提出的像素电路不仅能够有效地补偿驱动薄膜晶体管（TFT）的阈值变化，而且能够克服由大电流误差引起的电路的迁移率变化退化的问题。此外，还分析了基于两个传统晶体管一电容器（2T1C）的像素电路，并将其与提出的6T2C像素电路进行了比较。获得的结果表明，当前错误率的平均值为6。当阈值电压变化±0.03 V时为3％，远低于常规2T1C像素电路的电压。拟议像素电路的最大OLED电流为2.45μA，可以有效地用于小屏幕显示器。此外，对提出的电路进行了分析，以减少迁移率变化对OLED电流性能的影响，从而改善显示性能。