Title :
A Column Driver Architecture With Double Time-Division Multiplexing RDACs for TFT-LCD Applications
Author :
Chih-Wen Lu ; Ping-Yeh Yin ; Ying-Ting Lin
Author_Institution :
Dept. of Eng. & Syst. Sci., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Abstract :
This study proposes a thin-film-transistor (TFT) liquid crystal display (LCD) column driver architecture with double time-division multiplexing (TDM) resistor-string digital-to-analog converters (RDACs). A row of sample-and-hold circuits is used as a multiplexer to obtain a high multiplex ratio without requiring low temperature polysilicon TFTs on the display panel. The double TDM operation is proposed to compensate for the kickback noise produced by the output buffer. To improve the linearity of the DAC and the uniformity of the column driver, quasibootstrapped switches are used in the multiplexer to connect the DACs and output buffers. The column driver prototype was implemented by using 0.35 μm/0.5 μm CMOS technology with a worst positive-polarity differential nonlinearity/integral nonlinearity (DNL/INL) of 0.77/0.77 LSB and a negative-polarity DNL/INL of 0.79/0.79 LSB. The average data conversion rate of the RDAC is 18.2 MSPS and the die area per channel is only 0.017 mm 2.
Keywords :
CMOS integrated circuits; buffer circuits; circuit noise; digital-analogue conversion; driver circuits; liquid crystal displays; multiplexing equipment; sample and hold circuits; silicon; thin film transistors; time division multiplexing; CMOS technology; DNL/INL; LSB; Si; TDM; TFT-LCD application; average data conversion rate; column driver architecture; display panel; double time-division multiplexing RDAC; kickback noise; liquid crystal display; low temperature polysilicon TFT; multiplexer; output buffer; quasibootstrapped switch; resistor-string digital-to-analog converter; sample-and-hold circuit; size 0.35 mum; size 0.5 mum; thin-film-transistor; worst positive-polarity differential nonlinearity/integral nonlinearity; Buffer storage; Capacitors; Noise; Shift registers; Switches; Time division multiplexing; Digital-to-analog converter (DAC); LCD driver; column driver; liquid crystal display (LCD); resistor-string DAC (RDAC); thin-film-transistor (TFT); time-division multiplexing (TDM);
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2014.2349993
