EL Pixel Transistor Complementary Refresh Circuit

The patent implements periodic refreshing of the electro-luminescence pixel by alternating between a first thin film transistor and a second thin film transistor. During each refresh cycle, one transistor is activated to supply current to the electro-luminescence diode while the other is deactivated, allowing the activated transistor to operate periodically rather than continuously. This periodic operation reduces cumulative stress on individual transistors, extending their lifespan while maintaining precise luminous output control through the alternating transistor pairs.

The patent employs periodic refreshing with alternating transistor pairs to prevent residual images. By systematically activating different transistor pairs in succession across multiple refresh cycles, the patent ensures uniform current distribution and prevents localized stress accumulation that causes residual images. The periodic refresh mechanism maintains image durability over extended display periods while eliminating the harmful residual image effect.

The patent implements periodic operation of the second thin film transistor by alternating its activation with a fourth thin film transistor across refresh cycles. During each cycle, the second transistor transmits pixel data signals to the control node periodically rather than continuously, allowing it to remain stable when activated while reducing cumulative stress through periodic deactivation. This approach maintains pixel data signal stability during active periods while extending the overall display lifespan through reduced continuous operation stress.