An optical feedback system for local dimming backlight with RGB LEDs

Author

Lee, Tae-Wook ; Lee, Jae-Ho ; Kim, Chang-Gone ; Kang, Sin-Ho

Author_Institution

Light Emission Diode Dev. Dept., LG Display, Paju, South Korea

Volume

55

Issue

4

fYear

2009

fDate

11/1/2009 12:00:00 AM

Firstpage

2178

Lastpage

2183

Abstract

One of the major issues plaguing RGB LED backlight is color shift. This phenomenon is due to the characteristic changes of each Red, Green, and Blue LEDs as the time and temperature variation. To compensate this variation, many researchers are proposed color control method for the stable color management. However, their method is not suitable for the local dimming backlight because of the light interference between blocks. Therefore, we proposed an optical feedback system for the stable color control regardless of its dimming method. The test results show that our proposed method is very suitable for RGB LED backlights.

Keywords

colour displays; light emitting diodes; light interference; optical feedback; RGB LED; blue LED; color control method; color management; color shift; green LED; light interference; local dimming backlight; optical feedback system; red LED; Control systems; Degradation; Interference; Light emitting diodes; Optical control; Optical feedback; Optical sensors; Sensor systems; TV; Temperature; LED Backlight, Local dimming, Color control.;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/TCE.2009.5373785

Filename

5373785