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CCFL power supply for auto displays

Posted: 30 Jun 2009     Print Version  Bookmark and Share

Keywords:backlight inverter  CCFL  automotive displays  LCD backlighting 

Automotive displays must operate over the temperature range of -30 to +85°C 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 per cent 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 non-linear 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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