In general, the distance from a sign that text can be read. For digital displays, the maximum viewing distance is gauged by the readability of the entire display. It is generally accepted that for every 1′ of display height, there is a viewing distance of 40′ (40:1 ratio). For example, an 8′ display could reasonably be viewed at a distance of 320′. For traditional matrix displays, the maximum viewing distance is gauged by using the smallest text character (using a 7-pixel-high font). The accepted standard is that displays gain 50′ of viewing per inch of character height. For example, using a 7-high font for a 1.5″ pixel (character height = 7 pixels x 1.5″ = 10.5″), the viewing distance would be 525′. (10.5 x 50′ = 525). The minimum viewing distance is defined as the closest distance at which the colors from an individual pixel begin to blend with the surrounding pixels.