A driving method for a display panel, a driving chip, and a display device are provided. The method includes: pre-storing Gamma curves corresponding to different display modes of the display panel; monitoring a display mode of the display panel when an image is displayed by the display panel, and acquiring a negative power voltage signal corresponding to the display mode; acquiring a Gamma curve corresponding to the display mode from the pre-stored Gamma curves based on the monitored display mode; outputting the negative power voltage signal to the display panel; and correcting the image displayed by the display panel according to the acquired Gamma curve. The above driving method is configured to drive the image displayed by the display panel.