P‐27: A Novel Pixel Circuit with Threshold Voltage Variation Compensation in Three‐Dimensional AMOLED on Silicon Microdisplay

Abstract

A novel pixel driving circuit for high resolution and high image quality organic light emitting diode on silicon three-dimensional microdisplays is proposed in this paper. The pixel circuit is composed of four P-channel MOSFETs and one capacitor. By sharing the data line and power line, it compensates the threshold voltage ( ℎ ) variation of the driving transistor and then improves the image quality and operating speed. This pixel circuit is verified by SMIC 0.18 μm BCD process, and it is integrated into a pixel unit of 4*4.5. From post-layout simulation, within ± of ℎ variation, the emission current deviation ranges only from -0.56% to 0.50% under 240 Hz frame rate, which is -18.4% to 22.3% in the traditional 2T1C pixel circuits.