OLED Driving Transistor Trench Substrate Charge Interference
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Solution Overview
Problem
Flexible OLED display devices face reliability and lifetime issues due to non-uniformly distributed electric charges affecting the threshold voltage of transistors, leading to luminance changes and reduced transistor reliability.
Innovation Solution
The OLED display device incorporates a substrate with a first trench for the driving transistor, where the second organic film layer is removed under the transistor, and includes a first and second barrier layer to minimize the impact of electric charges, along with a thin film encapsulation structure for flexibility and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second organic film layer is removed under the driving transistor to reduce electric charge interference, then the reliability and lifetime of the driving transistor are improved, but the structural complexity of the substrate increases
Solution Approach 1:
The second organic film layer is selectively removed (extracted) from the region under the driving transistor to eliminate the source of non-uniform electric charges that interfere with transistor operation. This extraction of the problematic layer resolves the reliability issue while maintaining the overall substrate structure.
Solution Approach 2:
The substrate is segmented into regions with different organic film layer configurations: the region under the driving transistor has the second organic film layer removed, while other regions retain both organic film layers. This segmentation allows targeted elimination of electric charge interference only where the driving transistor operates, minimizing overall structural complexity changes.
2Stability of the object's composition
If barrier layers are added to minimize electric charge impact, then the threshold voltage stability is improved, but the manufacturing complexity increases
Solution Approach 1:
Barrier layers are introduced as intermediary structures between the organic film layers and the driving transistor. These barrier layers act as mediators that block or minimize the interference of non-uniform electric charges from the substrate while allowing the transistor to function normally, thus stabilizing the threshold voltage.
Solution Approach 2:
The substrate structure is transformed into a composite multi-layer system consisting of first organic film layer, first barrier layer, second organic film layer, and second barrier layer. This composite structure combines materials with different electrical properties to achieve threshold voltage stability while managing the manufacturing complexity through systematic layer integration.
Data Source
AI summary
An organic light emitting diode display device includes a substrate, a driving transistor, and a sub-pixel structure. The substrate has a first trench. The driving transistor is inside the first trench of the substrate. The sub-pixel structure is on the driving transistor.