A gamma reference voltage generating circuit comprises a first gamma reference voltage generating module and a second gamma reference voltage generating module. The first gamma reference voltage generating module is configured to receive a source voltage signal, amplify the source voltage signal to obtain a first gamma reference voltage signal, and output the first gamma reference voltage signal to a source driving circuit. The second gamma reference voltage generating module is configured to receive the source voltage signal, step down the source voltage signal to obtain a second gamma reference voltage signal, and divide a current on the second gamma reference voltage generating module into two output currents and transmit the two output currents to the source driving circuit, or buck chop the source voltage signal to obtain the second gamma reference voltage signal and transmit the second gamma reference voltage signal to the source driving circuit.