Pixel-shifting technology is typically used in 4K UHD projectors to enhance image quality and resolution by simulating a higher resolution (4K UHD) than the projector's actual native resolution.
It works by rapidly shifting pixels in the projected image by a fraction of a pixel, creating 'in between' pixel locations in the same positions as the pixels would have been in the target higher resolution image. This process is done at high speed and is imperceptible to the naked eye.