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A 1280-RGB $\times$ 800-Dot Driver based on 1:12 MUX for 16M-Color LTPS TFT-LCD Displays  

Kim, Cha-Dong (Dept. of Electronic Engineering, Sogang University)
Han, Jae-Yeol (System LSI division, Samsung Electronics Co., Ltd)
Kim, Yong-Woo (System LSI division, Samsung Electronics Co., Ltd)
Song, Nam-Jin (System LSI division, Samsung Electronics Co., Ltd)
Ha, Min-Woo (System LSI division, Samsung Electronics Co., Ltd)
Lee, Seung-Hoon (Dept. of Electronic Engineering, Sogang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.46, no.1, 2009 , pp. 98-106 More about this Journal
Abstract
This work proposes a 1280-RGB $\times$ 800-Dot 70.78mW 0.l3um CMOS LCD driver IC (LDI) for high-performance 16M-color low temperature poly silicon (LTPS) thin film transistor liquid crystal display (TFT-LCD) systems such as ultra mobile PC (UMPC) and mobile applications simultaneously requiring high resolution, low power, and small size at high speed. The proposed LDI optimizes power consumption and chip area at high resolution based on a resistor-string based architecture. The single column driver employing a 1:12 MUX architecture drives 12 channels simultaneously to minimize chip area. The implemented class-AB amplifier achieves a rail-to-rail operation with high gain and low power while minimizing the effect of offset and output deviations for high definition. The supply- and temperature-insensitive current reference is implemented on chip with a small number of MOS transistors. A slew enhancement technique applicable to next-generation source drivers, not implemented on this prototype chip, is proposed to reduce power consumption further. The prototype LDI implemented in a 0.13um CMOS technology demonstrates a measured settling time of source driver amplifiers within 1.016us and 1.072us during high-to-low and low-to-high transitions, respectively. The output voltage of source drivers shows a maximum deviation of 11mV. The LDI with an active die area of $12,203um{\times}1500um$ consumes 70.78mW at 1.5V/5.5V.
Keywords
LDI; LTPS; 1:12 MUX; class-AB; source driver;
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