Letter: A new compensation pixel circuit with metal oxide thin-film transistors for active-matrix organic light-emitting diode displays

This paper presents a novel compensation pixel circuit for active‐matrix organic light‐emitting diode displays, in which the coupling effect mask technology is developed to compensate the threshold voltage of driving thin‐film transistor whether it is positive or negative. Twenty discrete compensation pixel circuits have been fabricated by In‐Zn‐O thin‐film transistors process. It is measured that the non‐uniformity of the proposed pixel circuit is significantly reduced with an average value of 8.6%. Furthermore, the organic light‐emitting diode emission current remains constant during 6 h continuous operation, which also confirms the validity of the proposed pixel circuit. A novel compensation pixel circuit for active‐matrix organic light‐emitting diode displays in which the coupling effect mask technology is developed to compensate the threshold voltage of driving a thin‐film transistor whether it is positive or negative.