A projector's display is limited by the panel size (number of pixels), if a projector's panel size is 1280 x 800 pixels and the source (ie. laptop) has a resolution greater than 1280 x 800 the difference is made up with black bars on the top, bottom, and sides
You are here: Home | Why is it my monitor jumps to primary when I have secondary selected when I turn on my projector? The resolution also changes and my output is smaller on the screen.