Display driver, display device and display system

A display driver, a display device and display system are disclosed. Display panel of the display system according to an embodiment of the present disclosure, display an image; The first image by merging (merge) of data and the second image data to the host processor to generate an updated image data for the display panel; And the update image data received from the host processor, the first image data and the first divided into two image data, and a frame display section, based on the first image data and the second image data, wherein a display driving circuit for updating the separated first partial area and second partial area of ​​the display panel.