2010 ADA Standards for Accessible Design Pocket Guide
707.7 Display Screen.
The display screen shall comply with 707.7.
EXCEPTION: Drive-up only automatic teller machines and fare machines shall not be required to comply with 707.7.1.
The display screen shall be visible from a point located 40 inches (1015 mm) above the center of the clear floor space in front of the machine.
Characters displayed on the screen shall be in a sans serif font. Characters shall be 3/16 inch (4.8 mm) high minimum based on the uppercase letter "I". Characters shall contrast with their background with either light characters on a dark background or dark characters on a light background.