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 VDD 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.
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