A multi-phase charge-sharing technique without external capacitor for low-power TFT-LCD column drivers

With up to 75% power saving efficiency, theoretically, with infinite phases, a novel multi-phase charge-recycling technique that does not require any external capacitor for charge conservation is proposed for the dot inversion method, to reduce AC power consumption of a TFT-LCD column driver. It is easy to implement with simple circuitry. Compared with the original circuit (without any low-power scheme) and previous low-power charge-recycling work, the proposed method, with each group of 8 data lines, decreases the power consumption about 23%-68% and 10%-18%, respectively.