A driving control method for a display panel, comprising: sequentially turning on a first color sub-pixel, a second color sub-pixel, a third color sub-pixel and a white sub-pixel on the display panel in a first time period, a second time period, a third time period and a fourth time period respectively, so as to use a source driver to write grey-scale values of the sub-pixels respectively; when the source driver is used to write the grey-scale values of the white sub-pixels, the source driver reduces a set value of gamma voltage, such that when the grey-scale value of the white sub-pixel is written, the set value of gamma voltage is smaller than the set value of gamma voltage when the grey-scale value(s) of the first color sub-pixel, the second color sub-pixel and/or the third color sub-pixel are written. The method can improve display quality.