Threshold Voltage and IR Drop Compensation of an AMOLED Pixel Circuit Without a $V_{\rm DD}$ Line

This letter proposes a voltage drop by current (IR drop) and threshold voltage compensation pixel circuit, in which the power line is eliminated. The proposed circuit provides a larger fill factor than the conventional one because the circuit does not use a VDD line but instead utilizes the scan line as a power line. The proposed pixel circuit was verified using both circuit analysis and circuit simulations. The proposed circuit could increase the aperture ratio and compensate for the IR drop and threshold voltage variations in active matrix organic light-emitting diode devices, where I and R are current and resistance of the supply power lines. Using the proposed pixel circuit, a large fill factor with both IR drop and threshold voltage compensation was achieved.