In recent years, active-matrix organic light-emitting diode (AMOLED) displays have gradually replaced liquid crystal displays (LCDs) as the mainstream display technology, because OLEDs have many excellent characteristics, such as thin thickness, self-illumination, high contrast, high color saturation, fast response time, and flexibility. However, OLED is a current-driven device, and its emission current is easily affected by thin-film transistor (TFT) process variation. It requires precise compensation technology to ensure the consistency of driving currents to display high-quality and detailed images. In addition to using the compensation circuit designed in the pixel to compensate for TFT variations and OLED aging, our laboratory also combines the external compensation of the integrated circuit (IC) to improve the picture quality. Due to the short development cycle and high flexibility of the FPGA, the compensation mechanism can be quickly verified. Moreover, to improve the resolution of AMOLED displays, the external compensation pixel circuit with a concise structure and external compensation algorithm is also the mainstream direction of research. In this manner, the pixel compensation circuit with a complex structure can be omitted and the complexity of panel production can be reduced. Consequently, the yield of panel production is increased, and the superior characteristics of AMOLED are realized and shown completely.