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 55 nm 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 0.2-4.8 V, achieving a LSB of 1.1 mV. Simulation results indicate maximum differential nonlinearity of 0.22 LSB and integral nonlinearity of 0.54 LSB. Under a load of 15 KΩ resistor and 15 pF capacitor, the circuit achieves a settling time of 2.4 μs. It is suitable for Augmented Reality (AR) display devices with high color depth and resolution.