Power minimization in a backlit TFT-LCD display by concurrent brightness and contrast scaling

Author

Cheng, Wei-Chung ; Pedram, Massoud

Volume

50

Issue

1

fYear

2004

fDate

2/1/2004 12:00:00 AM

Firstpage

25

Lastpage

32

Abstract

This paper presents a concurrent brightness and contrast scaling (CBCS) technique for a cold cathode fluorescent lamp (CCFL) back/it TFT-LCD display. The proposed technique aims at conserving power by reducing the backlight illumination while retaining the image fidelity through preservation of the image contrast. First, we explain how CCFL works and show how to model the non-linearity between its backlight illumination and power consumption. Next, we propose the contrast distortion metric to quantify the image quality loss after backlight scaling. Finally, we formulate and optimally solve the CBCS optimization problem subject to contrast distortion. Experimental results show that an average of 3.7X power saving can be achieved with only 10% of contrast distortion.

Keywords

brightness; energy conservation; fluorescent lamps; liquid crystal displays; minimisation; power consumption; thin film transistors; backlit TFT-LCD display; backlit illumination reduction; cold cathode flourescent lamp; concurrent brightness and contrast scaling technique; contrast distortion metric; image contrast; image fidelity; image quality; power conservation; power minimization; Brightness; Cathodes; Energy consumption; Fluorescent lamps; Image quality; Lighting; Liquid crystal displays; Photometry; Pixel; Propagation losses;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/TCE.2004.1277837

Filename

1277837