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A mercury-free backlight in which Xe-type small diameter CFLs are installed, has been developed. We have evaluated the 7 inch-size backlight. Luminance of the backlight is 6,000cd/m2 at 6.5W. And this backlight has stable light output, rapid light output response and wide dimming capability over the wide temperature range. Therefore, it is suitable for a car-navigation display.

A Hg-Type cold cathode fluorescent lamp with rapid light output response, which is suitable for a backlighting ofinstrument clusters and navigation displays, has been developed. By optimizing the kind of gas, the gas pressure, the tube wall thickness and the lighting condition, a rapid rise of light output has been accomplished. By controlling the amount of mercury content, long life has been realized at wide temperature ranges. This newly developed lamp does not require any heating system, therefore a backlighting unit with simple structure can be achieved.