Design and development of digital control multi-lamp back-light modules for TFT-LCD TV

Author

Chen, C.-C. ; Nien, H.-S. ; Shen, C.-L. ; Wu, T.-F.

Author_Institution

Dept. of Electr. Eng., Nan-Jeon Inst. of Technol., Tainan, Taiwan

Volume

4

fYear

2005

fDate

2-6 Oct. 2005

Firstpage

2340

Abstract

This paper presents a digital control multi-lamp back-light module for TFT-LCD TV. The driving system consists of three modules and each module adopts three-phase inverters operated with interleaving fashion to drive cold cathode fluorescent lamps (CCFL), which can reduce input current ripple. A three-phase transformer is introduced to prevent current imbalance among lamps in each module. To improve power system dynamic responses during dimming function, phase-shift low frequency pulse-width-modulation (PWM) control signals are adopted to control the power delivered to each module. A digital control three-phase 18-lamp prototype has been built. Experimental results have verified the feasibility of the proposed system.

Keywords

PWM invertors; digital control; driver circuits; dynamic response; fluorescent lamps; power control; power system dynamic stability; CCFL; PWM; TFT-LCD TV; cold cathode fluorescent lamps; digital control; dimming function; driving system; interleaving fashion; multilamp back-light modules; phase-shift low frequency control signals; power system dynamic responses; pulse-width-modulation; three-phase inverters; three-phase transformer; Cathodes; Control systems; Digital control; Fluorescent lamps; Interleaved codes; Phase transformers; Power system dynamics; Pulse width modulation; Pulse width modulation inverters; TV;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005

ISSN

0197-2618

Print_ISBN

0-7803-9208-6

Type

conf

DOI

10.1109/IAS.2005.1518788

Filename

1518788