Open AccessSmall‐area DAC using adaptive body bias scheme for AMOLED data driver ICs
Author(s) -
Kim SeungTae,
Kwon OhKyong
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2015.0669
Subject(s) - pmos logic , amoled , differential nonlinearity , diode , electronic engineering , integral nonlinearity , computer science , channel (broadcasting) , materials science , electrical engineering , voltage , cmos , optoelectronics , engineering , transistor , layer (electronics) , telecommunications , converters , thin film transistor , active matrix , composite material
A small‐area digital‐to‐analogue converter (DAC) using an adaptive body bias scheme is proposed for active‐matrix organic light‐emitting diode (AMOLED) data driver ICs. The proposed scheme adjusts the body bias applied to the P‐type (PMOS) decoder according to the average picture level (APL) and maintains a low on‐resistance of the PMOS decoder at a high APL. This enables reduction of the DAC area by realising the upper‐half decoder using only PMOS switches, unlike conventional DACs which use both PMOS and N‐type switches. A 20‐channel data driver IC is fabricated using a 0.18 µm HVCMOS technology with 1.8 V/18 V devices. The proposed DAC occupies 33% less area than the conventional DAC and the measured differential nonlinearity and integral nonlinearity are +0.09/−0.1 and +0.36/−0.47 LSB, respectively.