Pixel Driving Circuit Dynamic Capacitance Adjustment

The patent implements a dynamic storage capacitor whose capacitance value can be adjusted based on the refresh frequency. The storage capacitor includes first and second capacitors that can be selectively connected to provide different total capacitance values (C1+C2 for 60Hz, C1 for 90Hz, C2 for 120Hz). This dynamic adjustment allows the system to adapt to different refresh frequencies by optimizing the charging capacity according to the available scanning time at each frequency.

The patent changes the capacitance parameter of the storage capacitor based on the refresh frequency. By controlling the switching transistors, the system selects different capacitance values (larger capacitance for lower refresh frequencies, smaller capacitance for higher refresh frequencies) to ensure adequate charging within the reduced scanning time window while maintaining proper voltage levels for display operation.

The storage capacitor is segmented into multiple sub-capacitors (first storage capacitor and second storage capacitor) that can be independently controlled. This segmentation allows the system to select different capacitance combinations based on refresh frequency requirements, providing adaptability without requiring a completely different circuit design for each frequency.

The storage capacitor structure is designed to serve multiple functions: it can operate at different capacitance values to support multiple refresh frequencies (60Hz, 90Hz, 120Hz) with a single circuit configuration. The switching mechanism enables one circuit structure to universally handle different operating conditions, eliminating the need for separate capacitor designs for each refresh rate.