Title :
Low drain voltage S/H type PWM LED current driver for BLU in mobile LCD
Author :
Changbyung Park ; Tae-Hwang Kong ; Gyu-Hyeong Cho
Author_Institution :
KAIST, Daejeon, South Korea
Abstract :
A pulse-width-modulation light emission diode (LED) current driver for Back Light Unit in mobile liquid crystal display with minimum operable drain voltage of 360mV and 3σ current accuracy of 3% without trimming is proposed in 0.35μm BCD process. S/H type structure with sequential channel driving scheme reduces power consumption as reference current of current mirror with accurate output current. High reference current is just applied for the enhanced matching in sampling phase, while reference current is minimized in holding phase. The proposed triggered buffer amplifier enables fast and accurate PWM current driving.
Keywords :
PWM power convertors; driver circuits; liquid crystal displays; reference circuits; BLU; PWM LED current driver; back light unit; high reference current; low drain voltage; mobile LCD; mobile liquid crystal display; pulse width modulation light emission diode; sequential channel driving; triggered buffer amplifier; voltage 360 mV; Accuracy; Current measurement; Light emitting diodes; Mirrors; Power demand; Pulse width modulation; Timing; LED driver; PWM; current driver;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2014 IEEE Proceedings of the
Conference_Location :
San Jose, CA
DOI :
10.1109/CICC.2014.6946086
