P4 refers to the pixel pitch of an indoor LED display, which is the distance between the center of one pixel and the next. A P4 display has a pixel pitch of 4 millimeters, meaning the pixels are small and tightly packed

Applications

Advertising: P4 displays are widely used in digital signage, particularly in places like shopping malls, airports, and retail stores.
Events and Exhibitions: They’re ideal for trade shows, exhibitions, and conferences where the screen is viewed from a distance.
Public Spaces: Used in stadiums, lobbies, or public event spaces for announcements, presentations, and advertisements.
Corporate or Conference Rooms: High-quality visuals for presentations and video conferencing