Abstract: By conducting combustion characteristic tests on LED unit modules in various configurations, the combustion characteristics and spread patterns of LED screens were investigated. Parameters such as the heat release rate, total heat release, and smoke production rate of unit modules in different configurations were measured. Additionally, parameters including the fire growth coefficient and peak heat release rate per unit area during screen combustion were analyzed. The experimental results indicate that when an LED screen catches fire, the flames primarily spread vertically along the screen surface, with negligible horizontal spread. The fire growth coefficient and peak heat release rate per unit area of the LED screen are influenced by factors such as screen height, module arrangement, and the involvement of circuit boards and electronic components on the back of display modules in combustion. During the initial stage of the fire, the fire growth coefficient falls between that of a medium-growth fire and a slow-growth fire. The combustion of LED screens produces significant amounts of dense smoke, accompanied by burning drips. To prevent the spread of fire, combustible materials should not be placed below LED screens, and smoke should be promptly vented in areas where such screens are installed.

Key words: LED screen, unit module, combustion characteristic test, heat release rate, fire growth coefficient