OLED Display Panel Driving Transistor Threshold Voltage Compensation
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Solution Overview
Problem
In OLED and micro LED display panels, the driving transistor experiences signal errors during screen switching due to deviations in threshold voltage, leading to inaccurate driving currents and suboptimal display effects.
Innovation Solution
A display panel design that includes a pixel circuit with a data-writing module, a driving module, and a compensation module, where the driving transistor is divided into first and second driving portions, with the compensation module connected between the gate and the first drain, and the data-writing module connected to the second source, to stabilize the threshold voltage and improve data signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the driving transistor operates with high driving capability, then the driving current is sufficient, but threshold voltage deviation causes signal error during screen switching
Solution Approach 1:
The driving transistor is divided into first and second driving portions, allowing independent control and compensation of threshold voltage deviations in different regions, thereby maintaining signal accuracy while preserving driving capability
Solution Approach 2:
The compensation module provides feedback to compensate for threshold voltage deviations in the driving transistor, dynamically adjusting the threshold voltage to reduce signal error during screen switching while maintaining driving capability
2Reliability
If the threshold voltage is compensated, then signal error is reduced, but device complexity increases
Solution Approach 1:
The compensation module is integrated with the driving transistor structure, merging the compensation function into the existing circuit rather than adding a completely separate system, thereby reducing the increase in device complexity while maintaining signal accuracy
Solution Approach 2:
The compensation module serves multiple functions including threshold voltage compensation, signal error reduction, and maintaining driving capability, thereby justifying the added complexity through multi-functionality
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a pixel circuit and a light-emitting element. The pixel circuit includes a data-writing module, a driving module, and a compensation module. The data-writing module is configured to selectively provide a data signal for the driving module. The driving module includes a driving transistor and is configured to provide a driving current to the light-emitting element. The compensation module is configured to compensate a threshold voltage of the driving transistor. A source of the driving transistor includes a first source and a second source, and a drain of the driving transistor includes a first drain and a second drain. A third driving portion is arranged between the first source and the second source. A first driving portion is arranged between the second source and the first drain.