Abstract: A software update method for a display device includes: storing a first software program by a first memory of a computer device; electrically coupling the computer device to the display device; controlling a display card of the computer device by a public application programming interface (API) function of a driver program of the display card or by a physical address of the display card searched by a search program coded by an operating system of the computer device; transferring the first software program stored in the first memory to the display device through a display data channel (DDC) of the controlled display card; and, receiving the first software program by the display device and updating a second software program stored in a second memory of the display device into the first software program by a microcontroller of the display device.