An acute angle is a small angle that measures less than 90 degrees. It is like a sharp corner you would find on a triangle or a corner of a square. Full definition
They perform really well in ambient light and are visible from acute angles. (nreionline.com)
Even with the phone titled at acute angles away from your eyes, the images on screen as still clear and colourful. (techradar.com)
It is not the brightest screen by any stretch but the viewing angles are reasonably good, with little color distortion at acute angles. (mobilegeeks.com)