Abstract: The invention is related to a flat panel display and a backlight module thereof. The backlight module comprises a light source and a plurality of wavelength converters. The light source formed by some arranged luminous elements would radially emit light with an optical wavelength individually. These wavelength converters are near the light source and convert the light with the wavelength. The converted light with another wavelength is radially emitted, in which a portion of the converted light with another wavelength is emitted outward directly from the wavelength converter, while the other portion thereof is emitted from the wavelength converter toward the other wavelength converters.