What is the viewing angle

Because the LCD screen using light transmission mechanism, and the light through the liquid crystal to near vertical angle shot to the front, so only when the monitor directly in front of, to get the best visual effects, changing the viewing angle,Light into the eye of the lcd display screen will also change the angle, distorted, darkened phenomenon, if it continues to change the viewing
angle, and have a certain critical point of view, we will not see the image within the screen.