A display driving circuit for driving pixel cells located on a liquid crystal display panel and sub-pixels located on an OLED panel which is an OLED backlight, one of the pixel cells corresponding to at least one of the sub-pixels, the display driving circuit comprising: a shift register unit having a source signal terminal, a pulse signal terminal, and at least one signal output terminal, and configured to output a signal inputted from the source signal terminal to the signal output terminal under control of the pulse signal terminal; wherein the one of the pixel cells and the at least one of the sub-pixels corresponding thereto are connected to the same signal output terminal.