Pixel Circuit Recharging Gate Potential to Stabilize Luminance
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Solution Overview
Problem
Traditional pixel circuits face current leakage issues affecting the gate potential of drive transistors, leading to luminance instability and perceived flickers due to brightness differences over time.
Innovation Solution
A pixel circuit design that includes a writing module, transfer module, first and second time-division transmission modules, and a storing module, where the storing module and transfer module are simultaneously charged with electricity, allowing the storage capacitor to be recharged during the light-emitting phase through these modules, effectively maintaining the potential of the drive module's control end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional pixel circuit is used, then the structure is simple, but current leakage occurs at the drive transistor gate causing luminance instability
Solution Approach 1:
The pixel circuit is divided into multiple functional modules: writing module (T2, T3), transfer module (T5, C1), drive module (T1), and storing module (C2). This segmentation allows each module to perform its specific function independently, with the transfer module acting as an intermediary to recharge the storage capacitor during the light-emitting phase, thereby resolving the current leakage issue while maintaining manageable circuit complexity
Solution Approach 2:
The transfer module consisting of transistor T5 and capacitor C1 serves as an intermediary between the writing module and the drive module. During the light-emitting phase, T5 transfers charge from C1 to C2, recharging the storage capacitor and compensating for gate potential leakage. This intermediary mechanism effectively stabilizes luminance without requiring a complete redesign of the entire pixel circuit
2Reliability
If the gate potential is not maintained, then the circuit operation is simple, but brightness difference occurs causing perceived flickers
Solution Approach 1:
The transfer transistor T5 operates periodically during the light-emitting phase to recharge the storage capacitor C2. By activating T5 at specific intervals (during phases when the light-emitting device is on), the circuit compensates for gate potential decay in a periodic manner, maintaining brightness consistency while minimizing continuous energy consumption compared to keeping a constant recharge path active
Solution Approach 2:
The transfer capacitor C1 acts as a temporary energy storage element that is charged during the writing phase and then discharged to recharge C2 during the light-emitting phase. This discarding and recovering mechanism allows the system to reuse stored charge multiple times, reducing the need for continuous external energy input and thereby maintaining brightness consistency with optimized energy consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design significantly reduces current leakage, stabilizes luminance, and minimizes brightness differences between frames, preventing flickers by ensuring consistent potential of the drive transistor's gate.
Implementation Method 1
a storage capacitor, wherein one pole of the storage capacitor is electrically connected to a gate of the drive transistor
Implementation Method 2
a transfer capacitor, wherein one pole of the transfer capacitor is electrically connected to the writing transistor; one of the source and a drain of the first switch transistor is electrically connected to the transfer capacitor
Data Source
AI summary
The present application discloses a pixel circuit and a display panel. The pixel circuit includes a writing module, a transfer module, a first time-division transmission module, a drive module, a second time-division transmission module and a storing module. The storing module and the transfer module can be simultaneously charged with electricity through a data signal, and the storing module can be recharged by the transfer module in a light-emitting phase through the first time-division transmission module, the drive module and the second time-division transmission module.