The 4803a chip on the LED display receiving card is the MOS tube AO4803\/A, mainly used as a switch pipe, the general voltage is too high will burn out; LEDdisplay (LEDdisplay) : a flat panel display, composed of a small LED module panel. LED (lightemittingdiode). It is a diode made of gallium (Ga) and arsenic (As), phosphorus (P), nitrogen (N), indium (In) compounds by controlling the display of semiconductor light-emitting diodes, and can radiate visible light when electrons and holes are combined, so it can be used to make light-emitting diodes. Used as an indicator in circuits and instruments, or as part of a text or numeric display. Gallium phosphatide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and indium gallium nitrogen diodes emit blue light.