In recent years, light emitting diode (LED) display arrays have emerged as the leading technology for large indoor or
outdoor display applications. LED has a lot of prominent advantages, for example, the high luminous efficiency, the less
power consumption, the longer lifetime for using, the better control performance, and so on. Because the luminance of
LED is higher than the traditional light source, the effects of display and picture quality are suitable for the LED display.
However, the increment of luminance has a limit for the LED display arrays, which is decided by the vision
characteristic of person's eyes. If the luminance goes beyond the limit, the person's eye will feel not comfortable. This
paper presents the vision characteristics for the person's eye and the LED features and some methods for solving a
certain factors that influence LED picture quality are described.