Pixel Driving Circuit With Periodic Bias Control for Lower Static Power

The bias circuit operates periodically rather than continuously. The controller activates the bias circuit only during specific periods when the capacitor requires charging, and deactivates it during other periods. This periodic operation maintains the necessary function of charging the capacitor to ensure stable light-emitting element operation while significantly reducing static power consumption by eliminating continuous power supply.

The capacitor serves itself by maintaining the bias voltage for the driving unit between charging periods. Once charged, the capacitor holds the voltage and provides the necessary bias without requiring continuous external power supply. This self-service mechanism allows the system to maintain stable operation while reducing power consumption, as the capacitor automatically discharges and recharges only when needed.

The bias circuit operation is optimized with local quality by applying different operation strategies to different sections of the frame. In sections where the light-emitting element requires charging, the bias circuit is activated. In sections where charging is not required, the bias circuit remains inactive. This section-based differential operation ensures complete charging coverage where needed while avoiding unnecessary power consumption in sections where charging is not required.

Instead of applying full bias circuit operation across all frame sections, the invention uses partial action by activating the bias circuit only in specific sections where charging is actually needed. The controller determines which sections require charging and limits the bias circuit operation to those sections only, avoiding excessive action in sections where charging would be unnecessary or redundant.