An LCD Backlight-Module Driver Using a New Multi-Lamp Current Sharing Technique

Chang-Hua LIN; John Yanhao CHEN; Fuhliang WEN

doi:10.1093/ietele/e88-c.11.2111

An LCD Backlight-Module Driver Using a New Multi-Lamp Current Sharing Technique

Chang-Hua LIN, John Yanhao CHEN, Fuhliang WEN

Full Text Views

0

Share
Cite this

Summary :

This paper proposes a backlight module which drives multiple cold-cathode fluorescent lamps (CCFLs) with a current mirror technique to equalize the driving current for each lamp. We first adopt a half-bridge parallel-resonant inverter as the main circuit and use a single-input, multiple-output transformer to drive the multi-CCFLs. Next, we introduce current-mirror circuits to create a new current-sharing circuit, in which its current reference node and the parallel-connected multi-load nodes are used to accurately equalize all CCFLs' driving current. This will balance each lamp's brightness and, consequently, improve the picture display quality of the related liquid crystal display (LCD). This paper details the design concept for each component value with the assistance of an actual design example. The results of the example are examined with its actual measurements, which consequently verify the correctness of the proposed control strategy.

Publication: IEICE TRANSACTIONS on Electronics Vol.E88-C No.11 pp.2111-2117

Publication Date: 2005/11/01

Publicized

Online ISSN

DOI: 10.1093/ietele/e88-c.11.2111

Type of Manuscript: Special Section PAPER (Special Section on Electronic Displays)

Category

Cite this

Copy

Chang-Hua LIN, John Yanhao CHEN, Fuhliang WEN, "An LCD Backlight-Module Driver Using a New Multi-Lamp Current Sharing Technique" in IEICE TRANSACTIONS on Electronics, vol. E88-C, no. 11, pp. 2111-2117, November 2005, doi: 10.1093/ietele/e88-c.11.2111.
Abstract: This paper proposes a backlight module which drives multiple cold-cathode fluorescent lamps (CCFLs) with a current mirror technique to equalize the driving current for each lamp. We first adopt a half-bridge parallel-resonant inverter as the main circuit and use a single-input, multiple-output transformer to drive the multi-CCFLs. Next, we introduce current-mirror circuits to create a new current-sharing circuit, in which its current reference node and the parallel-connected multi-load nodes are used to accurately equalize all CCFLs' driving current. This will balance each lamp's brightness and, consequently, improve the picture display quality of the related liquid crystal display (LCD). This paper details the design concept for each component value with the assistance of an actual design example. The results of the example are examined with its actual measurements, which consequently verify the correctness of the proposed control strategy.
URL: https://globals.ieice.org/en_transactions/electronics/10.1093/ietele/e88-c.11.2111/_p

Copy

@ARTICLE{e88-c_11_2111,
author={Chang-Hua LIN, John Yanhao CHEN, Fuhliang WEN, },
journal={IEICE TRANSACTIONS on Electronics},
title={An LCD Backlight-Module Driver Using a New Multi-Lamp Current Sharing Technique},
year={2005},
volume={E88-C},
number={11},
pages={2111-2117},
abstract={This paper proposes a backlight module which drives multiple cold-cathode fluorescent lamps (CCFLs) with a current mirror technique to equalize the driving current for each lamp. We first adopt a half-bridge parallel-resonant inverter as the main circuit and use a single-input, multiple-output transformer to drive the multi-CCFLs. Next, we introduce current-mirror circuits to create a new current-sharing circuit, in which its current reference node and the parallel-connected multi-load nodes are used to accurately equalize all CCFLs' driving current. This will balance each lamp's brightness and, consequently, improve the picture display quality of the related liquid crystal display (LCD). This paper details the design concept for each component value with the assistance of an actual design example. The results of the example are examined with its actual measurements, which consequently verify the correctness of the proposed control strategy.},
keywords={},
doi={10.1093/ietele/e88-c.11.2111},
ISSN={},
month={November},}

Copy

TY - JOUR
TI - An LCD Backlight-Module Driver Using a New Multi-Lamp Current Sharing Technique
T2 - IEICE TRANSACTIONS on Electronics
SP - 2111
EP - 2117
AU - Chang-Hua LIN
AU - John Yanhao CHEN
AU - Fuhliang WEN
PY - 2005
DO - 10.1093/ietele/e88-c.11.2111
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E88-C
IS - 11
JA - IEICE TRANSACTIONS on Electronics
Y1 - November 2005
AB - This paper proposes a backlight module which drives multiple cold-cathode fluorescent lamps (CCFLs) with a current mirror technique to equalize the driving current for each lamp. We first adopt a half-bridge parallel-resonant inverter as the main circuit and use a single-input, multiple-output transformer to drive the multi-CCFLs. Next, we introduce current-mirror circuits to create a new current-sharing circuit, in which its current reference node and the parallel-connected multi-load nodes are used to accurately equalize all CCFLs' driving current. This will balance each lamp's brightness and, consequently, improve the picture display quality of the related liquid crystal display (LCD). This paper details the design concept for each component value with the assistance of an actual design example. The results of the example are examined with its actual measurements, which consequently verify the correctness of the proposed control strategy.
ER -