Pixel Circuit Triple-Node Reset for Stable Low-Frequency Emission
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Solution Overview
Problem
Display panels suffer from issues such as unstable light emission, flickering, and residual shadows due to the gate of the driver transistor being affected by potential in previous frames, leading to brightness variation and flickering phenomena, especially at low frequencies, and long-term operation causing characteristic offset or hysteresis in the driver transistor.
Innovation Solution
A pixel circuit design incorporating a driving module, a first reset module, and a light-emitting element with a non-light-emitting phase that includes a first reset phase to reset the gate, first electrode, and second electrode of the driver transistor, thereby avoiding potential interference from previous frames and improving the driver transistor's conduction bias stress and reducing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the driver transistor is driven at low frequency, then power consumption is reduced, but the gate potential is affected by previous frame potential causing brightness variation and flickering
Solution Approach 1:
The patent applies preliminary action by resetting the gate potential of the driver transistor to a reference potential at the beginning of each frame before data writing occurs. This preliminary reset action eliminates residual potential from previous frames that would otherwise cause brightness variation and flickering at low driving frequencies, ensuring stable display performance while maintaining low power consumption.
2Duration of action of stationary object
If the driver transistor operates for a long period, then display continuity is maintained, but characteristic offset and hysteresis accumulate degrading performance
Solution Approach 1:
The patent implements periodic action by continuously resetting the gate potential of the driver transistor to a reference potential at the start of each frame. This periodic reset prevents the accumulation of characteristic offset and hysteresis effects that occur during long-term operation, maintaining stable transistor performance and consistent display quality over extended periods without interrupting display continuity.
3Device complexity
If no reset phase is provided, then the circuit structure is simplified, but residual potential from previous frames causes display defects
Solution Approach 1:
The patent applies preliminary action by introducing a reset phase at the beginning of each frame that resets the gate potential to a reference potential before data writing. This preliminary reset action eliminates residual potential from previous frames that would cause display defects such as flickering and brightness variation, while adding minimal complexity to the overall circuit structure.
Data Source
AI summary
The present application discloses a pixel circuit, display panel and display device f. The pixel circuit includes a driving module, a first reset module, and a light-emitting element. The driving module includes a driver transistor. A driving cycle of the pixel circuit includes a data writing frame, the data writing frame includes a non-light-emitting phase and a light-emitting phase, and the non-light-emitting phase includes a first reset phase. The drive module is configured to drive the light-emitting element to emit light in the light-emitting phase, and the first reset module is configured to simultaneously reset a gate, a first electrode, and a second electrode of the driver transistor in the first reset phase.