A fully non-linear column driver with a compact 12-bit DAC for LEDoS displays

Abstract

This article introduces a novel, compact 12-bit column driver DAC for LED on Silicon (LEDoS)displays using HLMC 55nm process. The proposed DAC utilizes fewer switches by introducing a multi-level strategy to transform signals, with its complete nonlinearity. This novel DAC operates within an output voltage range of 0.2-4.8V, achieving a LSB of 1.1mV. Simulation results indicate maximum differential nonlinearity of 0.22 LSB and integral nonlinearity of 0.54 LSB. Under a load of 15KΩ resistor and 15pF capacitor, the circuit achieves a settling time of 2.4μs. It is suitable for Augmented Reality (AR) display devices with high color depth and resolution.