Wide gamut display technologies using light sources with a narrow spectral radiance or applying multi-primary techniques have been introduced by several authors in forms of laboratory based models and high-end applications. To bring these technologies into the consumer field, our latest investigation resulted in a rear projection type multi primary display (MPD) for HDTV. The MPD has been realized by a modification of our previous three channel DLP™ projection TV system. Thereby the full spectral energy of the UHP™ projection lamp is sequentially separated into five primary spectrums through a rotating color wheel.The main focus of this paper is to describe a gamut mapping method that allows using a full range of color gamut of MPD for a given limited color gamut of TV signal. This approach is to display an image in such a way that the limited color saturations of the current TV signal are adaptively enhanced for every observer. Through the color gamut mapping, the picture quality of MPD is significantly improved in comparison with a conventional display system.