The perfect projected image is depended on many factors. On a simple level it could be a matter of adjusting the height to fit your screen. The simples way is adjusting the projector feet (Depending on the model it may have more or less feet or no feet)
Image height
The projector is equipped with elevator feet for adjusting the image height. The feet can be turn to be adjusted to the height you wish to have for your Projector
1. Locate the adjustable foot you wish to adjust on the underside of the projector.
2. Rotate the adjustable foot clockwise or counterclockwise to raise or lower the projector
Feet are adjustable by twisting or rotating the feet in a counterclockwise manner until the desired height is set for optimal image projection