A display panel assembly includes a display panel including an array of LED (Light Emitting Diode) pixels, and includes a support assembly configured to hold the display panel near the rear window of the vehicle. In one embodiment, the support assembly for holding the display panel in the vehicle includes a first strap and a first hinge. The first hinge includes: a first flap having a first hole; a pivot; and a second flap having a second hole and a third hole. The first strap includes a fourth hole and a fifth hole located at a hinge end of the strap, and a sixth hole located at a cross beam end of the strap.