A digital signage screen is a commercial display built to run continuously, which is what separates it from the television that looks identical in the shop. The differences are unglamorous and all operational: a duty cycle rated for 16 or 24 hours, higher sustained brightness, portrait orientation support, a landscape-agnostic panel that will not overheat on its side, and controls that survive being wall-mounted out of reach.
Most also carry a built-in system-on-chip, so the screen runs the signage player itself and there is no external box to mount, power, and eventually replace. That is fewer failure points and a much simpler installation.
The caveat is the one people learn the expensive way: a consumer TV will do this job for about eight months. It will run, and then the backlight will dim unevenly, the panel will develop burn-in from the static portion of the layout, and the warranty will not cover it; most consumer warranties explicitly exclude commercial use. Across a fleet, the replacement cycle costs more than commercial panels would have.
The other honest caveat is that built-in SoCs age faster than the panel. A screen may be mechanically fine years after its processor stops running current signage software, which is an argument for an external player on long-life installations.