There are mainly two kinds of 4K projectors: true 4K projectors and enhanced 4K projectors. Both of these play 4K content, but there is a difference. True 4K is 8.3 megapixels, and is considered as showing true 4K resolution by using a DLP 4K UHD chipset with advanced image processing, ensuring incredibly fast pixel switching speed. Enhanced 4K mainly refers to a more limited and slower version of pixel shifting technology, which mostly shows 2K resolution, or 4.1 megapixels, but fired twice to seemingly show 8.3 megapixels on the screen.
4.1 Million Pixels
8.3 Million Pixels