The invention provides a switch matrix and display matrix of a display device. The display matrix of a display device includes: a switch matrix including M×N MEMS switches, wherein M is the number of rows and N is the number of columns, and MEMS switches in each row are controlled by a corresponding row drive signal to output respective column data signals; and a pixel matrix including M×N pixel units each of which is coupled with a corresponding one of the M×N MEMS switches and displays in response to the column data signal output from the corresponding MEMS switch. The switch matrix can simplify pixel design and reduce layout area of each pixel. Moreover, conventional design needs special process to handle high voltage of source driver. This invention can realize a display device with one common process while source driver uses high voltage process conventionally.