Oled display panel, oled display device and driving method thereof

An OLED display panel, comprising a plurality of pixel regions, each pixel region comprising:

• a first storage capacitor, a second storage capacitor and a light-emitting circuit;
• wherein the light-emitting circuit comprises a first switch and a light-emitting unit;
• a control terminal of the first switch is coupled to a first terminal of the first storage capacitor, an input terminal of the first switch is coupled to a first terminal of the second storage capacitor and a first power supply, and an output terminal of the first switch is coupled to the light-emitting unit;
• a second terminal of the second storage capacitor and a second terminal of the first storage capacitor are coupled to a second power supply through a second switch, and the control terminal of the first switch is also coupled to a data line through a third switch;
• a control terminal of the second switch and a control terminal of the third switch are coupled to a scan line.

A driving method of an OLED display device, wherein the OLED display device comprises an OLED display panel, the OLED display panel comprises a plurality of pixel regions, each pixel region comprises:

• a first storage capacitor, a second storage capacitor and a light-emitting circuit;
• wherein the light-emitting circuit comprises a first switch and a light-emitting unit;
• a control terminal of the first switch is coupled to a first terminal of the first storage capacitor, an input terminal of the first switch is coupled to a first terminal of the second storage capacitor and a first power supply, and an output terminal of the first switch is coupled to the light-emitting unit;
• a second terminal of the second storage capacitor and a second terminal of the first storage capacitor are coupled to a second power supply through a second switch, and the control terminal of the first switch is also coupled to a data line through a third switch;
• a control terminal of the second switch and a control terminal of the third switch are coupled to a scan line;
• the driving method comprises:
• in the storage stage, voltage differences between the second power supply and data line voltages are stored by the first storage capacitor, and the threshold voltages of the first switch are stored by the second storage capacitor;
• in the display stage, the first switch is driven to be turned on in terms of the voltage differences, stored by the first storage capacitor, between the second power supply and the data line voltage and the threshold voltages, stored by the second storage capacitor, of the first switch.