The following Accessibility Guidelines for digital signage are provided as best practices for campus deployments and identify currently known requirements as they pertain to digital signage.
These guidelines are based on ADA Section 508, including § 1194.24 (Video & Multimedia Products) and § 1194.25 (Self Contained, Closed Products). Click here to review the full text of these sections
Color Contrast (Luminosity)
Background and foreground objects should provide a contrast ratio of 5:1 or greater. People with full vision and with various forms of color blindness require sufficient contrast to read text easily. Keep in mind, color-blind users may be unable to distinguish information conveyed by color without alternate identifiers for the information.
Content should be designed to avoid causing the screen to flicker with a frequency greater than 2 Hz and lower than 55 Hz
At worst, flickering and flashing content elements can cause epileptic seizures in some viewers. They are also disruptive to many readers with cognitive disabilities or low vision.
It is recommended that Audio not be used when/if possible due to the ADA requirements and the hurdles of deployment in areas where audio must compete with high ambient volumes.
Any audio or video content must provide synchronized captioning.
Mounting and Installation
As with any installation project on campus, ADA regulations apply. The primary one for digital signage has to do with mounting of hardware in a path of travel. The following is an excerpt from sec.4.4 regarding "Protruding Objects":
4.4 Protruding Objects.
4.4.1* General. Objects projecting from walls (for example, telephones) with their leading edges between 27 in and 80 in (685 mm and 2030 mm) above the finished floor shall protrude no more than 4 in (100 mm) into walks, halls, corridors, passageways, or aisles (see Fig. 8(a)). Objects mounted with their leading edges at or below 27 in (685 mm) above the finished floor may protrude any amount (see Fig. 8(a) and (b)). Free-standing objects mounted on posts or pylons may overhang 12 in (305 mm) maximum from 27 in to 80 in (685 mm to 2030 mm) above the ground or finished floor (see Fig. 8(c) and (d)). Protruding objects shall not reduce the clear width of an accessible route or maneuvering space (see Fig. 8(e)).
4.4.2 Head Room. Walks, halls, corridors, passageways, aisles, or other circulation spaces shall have 80 in (2030 mm) minimum clear head room (see Fig. 8(a)). If vertical clearance of an area adjoining an accessible route is reduced to less than 80 in (nominal dimension), a barrier to warn blind or visually-impaired persons shall be provided (see Fig. 8(c-1)).
For the complete text please follow the link below: Accessibility Guidelines for Buildings and Facilities sec.4.4