In ROM type audio and home theater, full hd projectors and playback devices use HDMI digital interface is linked together, in under the protection of digital transmission technology, ROM type audio quality of the whole movie will not appear in the process of transmission loss, users can enjoy the real hd picture, and with the director to see "the same" film quality. Especially the ROM type video projector technology fast development, the last two years the dynamic contrast ratio index has soared, can reproduce the image details, clear picture better than the cinema film.