External compensation for high‐resolution active matrix organic light‐emitting diode displays

Abstract Two different external compensation methods for high‐resolution active matrix organic light‐emitting diode (AMOLED) displays are presented and compared. Both compensation methods are implemented using a small pixel circuit, namely, a 3T2C and a 2T1C pixel circuit, allowing high‐resolution displays. Due to the simple driving schemes, these methods allow fast driving, even for large displays. The characterization results show a significant improvement in current variation by implementing either of these methods. The V T compensation method using a 3T2C pixel circuit is able to reduce the current variation down to 0.56%, whereas the V T ‐ and β‐factor compensation method using a 2T1C pixel circuit demonstrates a further reduction in current variations down to 0.079%. This method also clearly shows significant improvement in optical variation between neighboring pixels.