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Optoelectronics/Displays??

New CCFL power supply expands automotive applications for backlit LCDs

Posted: 11 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:CCFL? power supply? automotive? backlit LCDs?

Automotive displays must operate over the temperature range of -30 to + 85C and at the same time be viewable in direct sunlight or in total darkness. This requires a light source capable of very intense light that can also be dimmed to less than 1 percent of its maximum. Recent developments in CCFL technology improve light output at cold temperature, but have higher operating and strike voltages than standard lamps. Operating voltages and efficacy are also quite nonlinear over temperature. These load requirements, coupled with the eight to 16 volt range of a car battery present considerable challenge to a CCFL inverter that must be able to provide flicker free lighting from more than 400 to less than 1Nit.

New backlight inverter features pioneered by Microsemi are solving major problems in automotive LCD backlighting applications. The problems and their solutions, along with actual laboratory data, are presented in this application note.

View the PDF document for more information.





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