A 12-Bit Mobile OLED/μLED Display Driver IC with Cascaded Loading-Free Capacitive Interpolation DAC and 6.24V/μs-Slew-Rate Buffer Amplifier

• DOI: 10.23919/vlsicircuits52068.2021.9492490
• Publication Date: 2021-07-28T20:33:42Z
• Authors: Gyeong-Gu Kang; Seok-Tae Koh; Woojin Jang; Jiho Lee; Seongjoo Lee; Ohjo Kwon; Keumdong Jung; Hyun-Sik Kim
• Keywords: Slew rate; Interpolation; Buffer amplifier; 8-bit; Bit (key)

This paper presents an OLED/μLED display driver IC with cascaded loading-free capacitive interpolation (LFCI) DAC and a high-slew buffer amplifier. The 12-bit color-depth is realized by combination of 7-bit R-DAC proposed 5-bit LFCI while occupying only 295×17μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , which ×2 reduction compared to the state-of-the-art. In-pixel MSB-conversion also presented reduce chip size further. 5V amplifier offers slew-rate 6.24V/μs at 80pF static current 2μA. fabricated in 180-nm achieved measured 0.43LSB (DNL), 0.95LSB (INL), 7.9mV (DVO).