All mid-range and high-end projectors are 1080p or 4K. On the huge screens typical of even a modest home theater system, often 100 inches or more, the 4-fold difference between these resolutions is quite noticeable. However, resolution was only one aspect of image quality 2 days ago. You can get an idea of what you're missing in real 4K by using an improved 4K projector that actually has a native resolution of 1080p and a visual persistence trick to simulate 4K pixel density.
Even current JVC and Epson models that use two-phase pixel shift on 1080p chips can produce images that are much closer to replicating a full 4K image than you might imagine; sometimes they can even surpass DLP 4K UHD chips in subjectively impressing image sharpness. The reason 4K projectors are so expensive is that it's hard to put so many pixels on smaller chips. But, in the end, both the digital noise level and the contrast of the projector influence the perception of sharpness and the ability to resolve the details of these two projectors more than the physical resolution of their chips, which is not a problem. So, if you're looking to expand your gaming views in 4K, BenQ gaming projectors present a very attractive option that you should consider.
So, the bottom line is that there are many important factors that contribute to the success of a 4K projector. This is because the downscaling of 4K can get so much worse with your FHD projector that it could end up looking like a 720p projection instead of a 1080p one. Strict fundamentalists will say that the term should be reserved exclusively for projectors that have native 4K imaging devices and that no pixel-shifting machine should qualify. In theory, you can get 4K images on a 1080p projector if you have an improved 4K projector that uses pixels and mirrors that flash rapidly to simulate a density of 8.3 million pixels and, at the same time, work with 2.1 million pixels of native resolution.
The main differences between the two projectors are that the 4K projector has a higher resolution and an improved viewing experience, but it comes at an expensive price. The difference here is that native 4K projectors have approximately eight million different pixels on their panel to begin with, while pixel-changing technology starts with a smaller number of pixels and creates the highest number by using the source image and processing it. Today there are 4K projectors that use chips in several physical resolution formats: 1920 x 1080, 2716 x 1528, 3840 x 2160 and 4096 x 2160. There are several ways to improve the quality of a 4K video on a 1080p projector to minimize downscaling.