A new method of driving an AMOLED with MEMS switches

Author

Lee, Jeong Oen ; Yang, Hyun-Ho ; Jang, Weon Wi ; Yoon, Jun-Bo

Author_Institution

Korea Adv. Inst. of Sci. & Technol., Daejeon

fYear

2008

fDate

13-17 Jan. 2008

Firstpage

132

Lastpage

135

Abstract

We newly propose an active-matrix organic light-emitting diode (AMOLED) pixel circuit composed of MEMS switches and its digital driving method for grayscale modulation using time ratio gray scale (TRGS) scheme. Developing a spice compatible model of the MEMS switch, the proposed driving method has been successfully verified by circuit simulation. Current driving capability of the fabricated MEMS switch is evaluated with wiring them to the OLED pixel which is separately fabricated. We could obtain the ON current of 11.4 muA from the wired OLED and MEMS switch with a V_DD of 10 V. The fabricated MEMS switch with length of 50 mum and width of 10 mum showed the pull-in voltage of 58 V and total on-state resistance (with leads) of 20 Omega. We successfully demonstrated the grayscale changes of an OLED by modulating the duty ratio of the control signal at 60 Hz.

Keywords

LED displays; SPICE; driver circuits; microswitches; organic light emitting diodes; AMOLED display driver; MEMS switch fabrication; active-matrix organic light-emitting diode; circuit simulation; current 11.4 muA; frequency 60 Hz; pixel circuit; resistance 20 ohm; size 10 mum; size 50 mum; spice compatible model; time ratio gray scale scheme; voltage 10 V; voltage 58 V; Active matrix organic light emitting diodes; Active matrix technology; Circuits; Costs; Flat panel displays; Microswitches; Organic light emitting diodes; Switches; Thin film transistors; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Micro Electro Mechanical Systems, 2008. MEMS 2008. IEEE 21st International Conference on

Conference_Location

Tucson, AZ

ISSN

1084-6999

Print_ISBN

978-1-4244-1792-6

Electronic_ISBN

1084-6999

Type

conf

DOI

10.1109/MEMSYS.2008.4443610

Filename

4443610