Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
EE Times-Asia > Controls/MCUs

How to prevent flicker caused by burst dimming

Posted: 20 Mar 2009 ?? ?Print Version ?Bookmark and Share

Keywords:controllers CCFL? flicker prevent? dimming burst?

The DS3881 and DS3882 CCFL controllers use both analog lamp-current amplitude modulation and digital PWM burst-dimming techniques to achieve a high dimming ratio. These controllers are typically used in used in automotive, industrial and avonic applications to backlight LCD panels requiring a high dimming ratio.

Digital PWM burst dimming can cause a problem at very low dimming levels unless an external PWM signal, synchronized to the lamp clock, is used to control the width of the burst-dimming period. If that PWM burst-dimming signal is generated either from the DS3881/DS3882's internal oscillator or from an external oscillator, which are asynchronous to the lamp clock, then visible flicker can appear on the LCD panel at very low brightness levels.

This application note describes how to eliminate the flicker.

View the PDF document for more information.

Article Comments - How to prevent flicker caused by bur...
*? You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.

Back to Top