26.2: A Single‐Inductor Multi‐Output Converter with Multi‐Vector Current Control in Power‐saving Driving Skill of Electronic Paper Displays (EPDs)

Abstract

Electronic paper display (EPD) shows the trend of state-of-the-art display technique. It not only holds image/text without consuming energy but also presents thin and flexibility like ordinary paper. Single-inductor multi-output (SIMO) converter, with innovative multi-vector current-control methodology, precisely tracks and quantifies the actual demanded-energy and addresses excessive-energy for power-efficient and space-minimized requirements of EPDs. The testing chip occupies 0.45 mm 2 in 0.25 μm CMOS technology and achieves the power conversion efficiency larger than 85 % at the order of 0.5 mW output power.

P‐54: A Single‐Inductor Bipolar‐Output Converter with Power Conservation Mechanism (PCM) for Driving Cholesteric LCD

“…Owing to the PCM operation, the error signal V en can also be adjusted in order to ensure the equivalent charge for V on at the load transient response. Consequently, the area-(4) in Figure 6 is magnified to provide the sufficient power for V op compared to area-(2) and area- (6). Moreover, the area-(3) can be ensured equal to area-(1) since the load at V on is unchanged due to the PCM operation.…”

“…The comparatorcontrolled technique [4] can improve efficiency but sacrifice output regulation performance. The current-mode control scheme [5]- [6] with fast transient response needs to arrange the energy delivery paths as well as the inductor current. The proposed SIBO converter with the power conservation mechanism (PCM) can achieves the driving scheme for Ch-LCD for high-quality display.…”