A 10b column driver with variable-current-control interpolation for mobile active-matrix LCDs

Abstract

An embedded DAC requires a large number of input transistors (=2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N+1</sup> for N-bit interpolation) in its amplifier. Moreover, the transistors require large width and length for accurate matching, leading to an area penalty in the amplifier for high bit interpolation (e.g. N>3). In this paper, an area-efficient and accurate interpolation method that uses variable-current control (VCC) for 10b mobile AMLCD column drivers is presented.