A Novel Two-Dimensional Adaptive Dimming Technique of X-Y Channel Drivers for LED Backlight System in LCD TVs

Author

Oh, Won-Sik ; Cho, Daeyoun ; Cho, Kyu-Min ; Moon, Gun-Woo ; Yang, Byungchoon ; Jang, Taeseok

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon

Volume

5

Issue

1

fYear

2009

Firstpage

20

Lastpage

26

Abstract

In this paper, a novel two-dimensional (2-D) adaptive dimming technique with X-Y channels for light-emitting diode (LED) backlight system in LCD TVs is proposed. The proposed LED backlight has matrix-structured LED modules with row and column switches to control the brightness of individual division block. It shows local dimming effects such as reduced power consumption and high dynamic contrast ratio even with much less number of LED drivers than that of the conventional 2-D local dimming method. Therefore, low cost and compact design of LED drivers can be achieved. This paper also contains a new adaptive dimming algorithm and image manipulation technique for the proposed LED backlight system. The proposed dimming technique is verified by simulation and experimental results based on a RGB-LED backlight of a 32-in LCD TV.

Keywords

brightness; light emitting diodes; liquid crystal displays; television displays; LCD TV; LED backlight system; RGB-LED backlight; X-Y channel drivers; brightness control; dynamic contrast ratio; image manipulation technique; light-emitting diode; power consumption reduction; two-dimensional adaptive dimming technique; Brightness; Costs; Driver circuits; Energy consumption; Fluorescent lamps; Light emitting diodes; Liquid crystal displays; Moon; Switches; TV; Adaptive dimming method; driver circuit; light-emitting diode (LED) backlight; liquid crystal displays (LCDs); local dimming method;

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2008.2004358

Filename

4796388