Hydrogen-Blocking Display Layers for Transistor Reliability
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Solution Overview
Problem
Display devices face issues with hydrogen diffusion from the encapsulation unit leading to transistor degradation and resistance increase, affecting reliability and brightness deviation.
Innovation Solution
Incorporating a hydrogen blocking layer doped with a hydrogen capture material between the substrate and light-emitting elements to minimize hydrogen diffusion and enhance transistor reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional encapsulation unit is used without hydrogen blocking layers, then the device structure is simple and manufacturing is easier, but hydrogen diffuses from the encapsulation unit causing transistor degradation and reliability deterioration
Solution Approach 1:
A hydrogen blocking layer is introduced as an intermediary component between the encapsulation unit and the transistor. This layer acts as a mediator that captures and blocks hydrogen diffusion from the encapsulation unit, preventing hydrogen from reaching and degrading the transistor. The blocking layer is doped with hydrogen capture materials to enhance its hydrogen blocking capability, thereby improving transistor reliability without fundamentally changing the encapsulation unit structure.
Solution Approach 2:
The hydrogen blocking layer is formed in advance during the manufacturing process, before the encapsulation unit is fully assembled or before hydrogen diffusion can occur. By pre-establishing the hydrogen blocking barrier with appropriate doping, the system proactively prevents hydrogen degradation rather than reacting to it after damage occurs. This preliminary protective action ensures transistor reliability from the outset.
2Reliability
If the line area is increased to reduce resistance, then resistance decreases and brightness deviation is reduced, but the device area increases
Solution Approach 1:
The resistance of the line is optimized by adjusting its cross-sectional area parameters. By carefully selecting and tuning the width and thickness of the line, the design achieves a balance between resistance reduction and area minimization. This parameter optimization allows sufficient current flow to reduce brightness deviation while maintaining a compact device footprint.
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
The hydrogen blocking layer effectively inhibits hydrogen diffusion, reducing transistor degradation and resistance, thereby improving the display device's quality and brightness consistency.
Implementation Method 1
at least one of the planarization layer and the plurality of insulating layers is a hydrogen blocking layer doped with a hydrogen capture material
Data Source
AI summary
A display device includes a transistor disposed over a substrate, a planarization layer disposed over the transistor, a light-emitting element disposed over the planarization layer; and a plurality of insulating layers disposed between the substrate and the light-emitting element, and at least one of the planarization layer and the plurality of insulating layers is a hydrogen blocking layer doped with a hydrogen capture material.