How good is digital cinema?

Question

Is the Digital screen as big as a film theaters screen?

Is the resolotion of the Digatal projectors very high?

How good is the suournd sound?

Answer 1

Do you mean 4K digital theatre? i.e. resolution up to 2160p?

Sony is one manufacturer of projectors (See link).  

Quoting from the professional projector brochure "The core component of this system, the SRX-R220 and SRX-R210 projectors, are equipped with

three Silicon X-tal Reflective Display (SXRD™) imaging devices, delivering an amazing resolution

of 4096 x 2160 pixels (H x V) - more than four times the resolution of full HDTV (1920 x 1080).

The SXRD devices also provide a SMPTE-standard brightness level: 14 ft-L on a 20-meter (65.6-foot) wide screen for the SRX-R220 and a 17- or 14-meter (55.8- or 45.9-foot) wide screen for the SRX-R210, along with a high contrast ratio of 2000:1.

While technically this resolution is less than 35 mm film, in practice actual copies of movies shown in theatres are inferior to the original master print, and 4K digital can actually be better / superior to all but a few fi,m thatres (e.g. IMAX).

Surround sopund can be multi channel .. superior to Blu-ray or HD DVD advanced sound ... at least in terms of number of channels.

But don't expect to buy this for home. Prices for the projector and media server are in the hundreds of thousands of dollars and you can't buy the movies at Blockbuster!