Display Panel Bias Module for Threshold Voltage Drift
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Solution Overview
Problem
The threshold voltage drift of drive transistors in display panels over time affects display uniformity due to changes in internal characteristics, leading to deviations in the I-V curve and reduced performance.
Innovation Solution
A pixel circuit with a bias module connected between the drive transistor's drain and light emission control signal line adjusts the drain potential, balancing the gate and drain potentials to reduce threshold voltage drift and ensure uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive transistor operates continuously without bias adjustment, then the display panel can maintain normal operation, but the threshold voltage drifts over time affecting display uniformity
Solution Approach 1:
The patent applies periodic bias stages interspersed among normal operation stages. During these bias stages, the drain potential is adjusted to counteract threshold voltage drift. This periodic intervention maintains threshold voltage stability without continuously disrupting normal display operation, thereby resolving the contradiction between operational reliability and threshold voltage stability.
Solution Approach 2:
The patent dynamically changes the drain potential parameter during bias stages to compensate for threshold voltage drift. By adjusting this electrical parameter periodically, the system maintains stable transistor characteristics and display uniformity while allowing continuous operation, thus resolving the contradiction between operational reliability and threshold voltage stability.
2Reliability
If a bias module is added to adjust drain potential, then threshold voltage drift is reduced, but the circuit complexity increases
Solution Approach 1:
The bias module is designed to perform multiple functions: it adjusts drain potential to compensate for threshold voltage drift, and can be integrated with existing pixel circuit components. This multi-functionality reduces the need for separate compensation circuits, thereby limiting the increase in overall circuit complexity while maintaining threshold voltage stability.
Solution Approach 2:
The bias module operates by changing the drain potential parameter in a controlled manner during specific bias stages. This parameter-based approach is more efficient than structural modifications, as it achieves threshold voltage compensation through electrical control rather than adding complex physical components, thus resolving the contradiction between reliability improvement and circuit complexity.
Data Source
AI summary
Provided are a display panel, a driving method thereof, and a display device. The display panel includes a pixel circuit and a light-emitting element; where the pixel circuit includes a drive module, a data writing module, a light emission control module, and a bias module; where the drive module is configured to provide the light-emitting element with a drive current and includes a drive transistor; the data writing module is connected to a source of the drive transistor and configured to selectively provide the drive module with a data signal; the light emission control module is configured to selectively allow the light-emitting element to enter a light-emitting stage; the bias module is connected between a drain of the drive transistor and the light emission control signal line.