Title :
High-capacity DC-DC converters for active matrix OLED display
Author :
Lee, Seok ; Yoon, Jayang ; Kim, Jaehoon ; Lee, Changsuk ; Jung, Hawoong ; Lee, Jaeshin ; Choi, Joongho
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Seoul, Seoul, South Korea
Abstract :
Two DC-DC converters for bipolar outputs is implemented which are suitable for large-size AM-OLED (Active-Matrix Organic Light Emitting Diode) display. The positive output voltage is regulated by a buck DC-DC converter, and the negative one is regulated by a inverting buck-boost DC-DC converter. Both DC-DC converters operate in a current mode in order to enhance the transient responses. The improved discrete-mode detection circuit is proposed to achieve high-efficiency and accurate output voltages when converters operate in discontinuous-conduction mode. Compensation blocks such as artificial ramp and PI-compensator are incorporated for maintaining stability. The DC-DC converters are fabricated in a 0.35-um BCD technology. For typical operating conditions, maximum efficiencies of buck and inverting buck-boost converters are 92% and 83.1%, respectively.
Keywords :
BIMOS integrated circuits; DC-DC power convertors; LED displays; organic light emitting diodes; AM-OLED; Active Matrix Organic Light Emitting Diode display; BCD technology; PI compensator; active matrix OLED display; artificial ramp; discrete mode detection circuit; high capacity DC-DC converter; size 0.35 mum; transient response; Inductors; Pulse width modulation; Sensors; Switches; Transistors; Voltage control; AM-OLED; DC-DC Buck Converter; DC-DC Buck-Boost Converter; Discrete-Mode Detection;
Conference_Titel :
Circuits and Systems (APCCAS), 2010 IEEE Asia Pacific Conference on
Conference_Location :
Kuala Lumpur
Print_ISBN :
978-1-4244-7454-7
DOI :
10.1109/APCCAS.2010.5775053
