Backlight LED pulse drive method and luminous efficiency

Author

Wen Huaijiang ; Sun Hong

Author_Institution

Sch. of Electron. & Inf., Zhejiang Univ. of Media & Commun., Hangzhou, China

fYear

2012

fDate

9-11 Nov. 2012

Firstpage

1

Lastpage

6

Abstract

The affect coefficient between the luminous efficiency of backlight LED and the pulse driver parameters is experimentally studied with a novel test method. The experiment results show that the LED luminous efficiency was substantially decreased when the LED was driven by a high peak and low duty ratio pulse current. Given 200-2000Hz and 10-90% duty ratio pulse current, the LED got relatively higher luminous efficiency, while the efficiency could decrease by 2-5% as the modulation frequency rose to 20000Hz. Given the rated peak pulse current with low duty ratio, LED luminous efficiency could increase by 10-30% given the smaller ripple coefficient pulse current, the LED luminous efficiency increased. The work in this paper could contribute to the LED´s drive design in the field of LCD backlight, electronic display and studio lighting.

Keywords

LED displays; driver circuits; lighting; LED luminous efficiency; backlight LED pulse drive method; duty ratio pulse current; electronic display; frequency 200 Hz to 2000 Hz; peak pulse current; ripple coefficient pulse current; studio lighting; Brightness; Current measurement; Electric potential; Frequency measurement; Light emitting diodes; Pulse measurements; Temperature measurement; LED; duty ratio; luminous efficiency; pulse driving;

fLanguage

English

Publisher

ieee

Conference_Titel

Image Analysis and Signal Processing (IASP), 2012 International Conference on

Conference_Location

Hangzhou

Print_ISBN

978-1-4673-2547-9

Type

conf

DOI

10.1109/IASP.2012.6425054

Filename

6425054