Embodiments of the present invention relate to modular display panels. In one embodiment, a modular display panel includes a printed circuit board, a shell, a plurality of LEDs, a power supply, and a heat conducting structure. The LEDs are attached to a first side of the printed circuit board. The shell contacts an opposite second side of the printed circuit board. The shell includes a back surface that includes an outer back surface of the panel. A driver circuit is disposed in the shell. The sidewalls of the shell include plastic. The printed circuit board is disposed between the power supply and the LEDs. The power supply includes a power converter for converting alternating current (AC) power to direct current (DC) power. The heat conducting structure is disposed between the power supply and the back surface of the shell. The modular display panel is sealed to be waterproof.