Can a digital photo frame be kept on all the time when plugged in? Will it affect its service life?

Digital photo frames can be used long-term while plugged in, with their design accounting for heat dissipation. However, avoid long-term operation in high-temperature environments (e.g., direct sunlight, near heating appliances) to extend the lifespan of the screen and internal components. Turn off the power if not used for a long time.