OLED-on-silicon chip with new pixel circuit

Abstract

A low power 640×480 OLED-on-silicon chip design that used in microdisplay was presented. A novel pixel circuit was proposed to meet the special requirement of OLED-on-silicon. The novel pixel consists of three transistors and one capacitor (3T1C). It has simple structure and can effectively reduce the current glitch generated during the AC driving from 55 μA to 7.5 μA, so that it can improve the precision of grayscale of display as well as extend the lifetime of OLED material. Except for the pixel array, low power row driver, column driver and other functional modules were also integrated on the chip. Several techniques were adopted to reduce the power consumption and frequency requirement of the chip. Finally, a 16×3×12 resolution chip was fabricated with standard 0.35 μm CMOS process of CSM and the chip can operate correctly.

Keywords

organic light-emitting diode (OLED) / pixel circuit / ac driving

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