A 402-output TFT-LCD driver IC with power control based on the number of colors selected

A 402-output thin-film-transistor liquid crystal display (TFT-LCD) driver integrated circuit (IC) with power control based on the number of colors to be displayed is described. To achieve this type of power control, reference voltage buffers are turned on and off according to the selected number of...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2003-03, Vol.38 (3), p.503-510
Main Authors: Itakura, T., Minamizaki, H., Saito, T., Kuroda, T.
Format: Article
Language:English
Subjects:
Buffers
Capacitance
CMOS
CMOS integrated circuits
CMOS technology
Decoding
Driver circuits
Drivers
Electric potential
Frequency
Integrated circuits
Liquid crystal displays
Operational amplifiers
Power control
Voltage
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Description
Summary:A 402-output thin-film-transistor liquid crystal display (TFT-LCD) driver integrated circuit (IC) with power control based on the number of colors to be displayed is described. To achieve this type of power control, reference voltage buffers are turned on and off according to the selected number of colors. In this architecture, the reference voltage buffers must drive 1-402 capacitive loads, corresponding to a capacitance of 30-12000 pF. Phase compensation using a zero formed with capacitive loads is proposed for the reference voltage buffers. The introduced zero has a fixed zero frequency for 1-402 loads. An operational amplifier with slew-rate enhancement is also proposed for the buffers. An experimental 402-output TFT-LCD driver IC was fabricated using a 0.6-/spl mu/m CMOS technology. The chip size was 2.35 mm /spl times/ 18.1 mm. The quiescent current dissipation of the analog section including decoders was 529 /spl mu/A for 262144 colors, 182 /spl mu/A for 4096 colors, and 112 /spl mu/A for 512 colors for a 5-V supply.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2002.808308