Hydrogen Barrier Insulating Layers for Display Reliability
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Solution Overview
Problem
Current display devices for VR, AR, and MR applications face challenges in achieving high definition, high color reproducibility, and high luminance due to the low definition of display panels, which affects the sense of reality and immersion.
Innovation Solution
A display device structure incorporating a transistor over a substrate with specific insulating layers and a light-emitting element configuration, including a conductive layer, an EL layer, and a plug to connect the transistor, where the second insulating layer inhibits hydrogen diffusion and includes nitrogen and silicon, and a third insulating layer covers the light-emitting element to prevent impurity diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a display panel with high definition is used, then the sense of reality and immersion is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The display panel is divided into multiple sub-pixels (red, green, blue) arranged in a specific pattern, with each sub-pixel independently controlled by transistor circuits. This segmentation enables high definition display while maintaining manageable manufacturing complexity through standardized pixel structures.
Solution Approach 2:
Different insulating layers with specific compositions (nitrogen-containing, silicon-containing, oxygen-containing) are applied to different regions and depths of the display structure. Each layer provides localized protection against hydrogen diffusion and impurity contamination, enabling high definition display without requiring uniform complex structures throughout.
2Reliability
If insulating layers with high hydrogen diffusion inhibition capability are used, then the reliability of the light-emitting element is improved, but the device structure becomes more complex
Solution Approach 1:
The insulating layers are designed with specific compositional parameters (nitrogen content, silicon content, oxygen content) and thickness parameters to achieve optimal hydrogen diffusion inhibition. By controlling these parameters, high reliability is achieved without requiring excessive structural complexity.
Solution Approach 2:
Multiple insulating layers with different material compositions are stacked together - nitrogen-containing layers, silicon-containing layers, and oxygen-containing layers - to create a composite barrier structure. This composite approach provides superior hydrogen diffusion inhibition compared to single-material layers, achieving high reliability with reasonable structural complexity.
3Measurement precision
If multiple insulating layers are added to prevent impurity diffusion, then the color reproducibility is improved, but the manufacturing process becomes more complex
Solution Approach 1:
Insulating layers are formed during the early stages of manufacturing, before the light-emitting element is fully assembled. This preliminary formation of protective barriers prevents impurity diffusion during subsequent manufacturing steps, ensuring color reproducibility without requiring complex post-assembly processes.
Solution Approach 2:
The thickness and composition parameters of each insulating layer are optimized to provide sufficient impurity diffusion protection while maintaining transparency for accurate color display. By carefully controlling these parameters, good color reproducibility is achieved with manageable manufacturing complexity.
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 solution provides a display device with extremely high definition, high reliability, and high color reproducibility, enhancing the sense of reality and immersion in VR, AR, and MR applications.
Implementation Method 1
The second insulating layer has higher capability of inhibiting hydrogen diffusion than the first insulating layer
Implementation Method 2
By applying voltage to this element, light emission can be obtained from the light-emitting organic compound
Data Source
AI summary
A highly reliable display device is provided. The display device includes a transistor over a substrate, a first insulating layer over the transistor, a second insulating layer over the first insulating layer, a plug placed to be embedded in the first insulating layer and the second insulating layer, and a light-emitting element over the second insulating layer. The light-emitting element includes a first conductive layer, an EL layer over the first conductive layer, and a second conductive layer over the EL layer. The plug electrically connects one of a source and a drain of the transistor to the first conductive layer. The second insulating layer has higher capability of inhibiting hydrogen diffusion than the first insulating layer.