Columnar Light Emitter Layout for Leakage Current Suppression
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Solution Overview
Problem
Existing light emitting devices with nanostructures face issues such as leakage currents leading to inadequate light emission in the intended regions and unwanted emission in other areas due to difficulties in current flow and structural irregularities.
Innovation Solution
The device incorporates a substrate with alternating first and second columnar structures, separated by an insulating layer, and a conductive layer connected to the first structures, ensuring uniform current distribution and preventing leakage by maintaining a flat inter-layer insulating surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a plurality of columnar structures are disposed in a light emitting section, then light emission is achieved, but leakage current occurs and prevents predetermined current from flowing through the light emitting region
Solution Approach 1:
The patent divides the substrate into distinct regions: a light emitting section with first columnar structures and a non-light emitting section with second columnar structures. This segmentation isolates the light emitting region from adjacent areas, preventing leakage current from spreading to non-emitting regions and ensuring stable current flow through the intended light emitting section only.
Solution Approach 2:
The patent applies different structural configurations to different regions: the light emitting section has first columnar structures with specific properties optimized for light emission, while the non-light emitting section has second columnar structures with different properties that prevent unwanted emission and leakage. This local differentiation ensures that each region performs its specific function without interfering with others.
2Area of stationary object
If columnar structures are disposed closely to increase light emitting area, then light emission area is increased, but unwanted light emission occurs in areas other than the light emitting section
Solution Approach 1:
The substrate is segmented into a light emitting section containing first columnar structures and a non-light emitting section containing second columnar structures. This spatial segmentation ensures that even when columnar structures are densely packed, the second columnar structures in non-emitting regions are structurally configured to prevent unwanted light emission, thus increasing overall light emitting area without causing harmful stray emission.
Solution Approach 2:
Different columnar structure configurations are applied locally: first columnar structures in the light emitting section are optimized for efficient light generation, while second columnar structures in non-light emitting sections have properties that suppress unwanted emission. This local quality differentiation allows dense packing of structures while maintaining precise control over where light is emitted.
3Ease of manufacture
If the inter-layer insulating layer surface is irregular, then manufacturing is simplified, but leakage current increases due to structural irregularities
Solution Approach 1:
The patent incorporates a flattening step that creates a flat surface on the inter-layer insulating layer before subsequent processing. This preliminary action of flattening eliminates surface irregularities that would cause leakage current, while still allowing for simple manufacturing of the columnar structures themselves. The flat surface ensures uniform current distribution and prevents leakage without significantly complicating the overall manufacturing process.
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
This configuration enhances consistent light emission in intended regions while preventing unwanted emission, improving manufacturing simplicity and reliability by minimizing leakage currents and structural defects.
Implementation Method 1
a light emitting device provided with a light emitting section having a plurality of nanostructures which can emit light in response to injection of a current
Implementation Method 2
a light propagation layer disposed between the first columnar structures
Data Source
AI summary
A light emitting device includes a substrate, and a first columnar structure group having first columnar structures at a light emitting section and first intermediate columnar structures, a second columnar structure group having second columnar structures at a region other than the light emitting section and second intermediate columnar structures, an inter-layer insulating layer covering the first and second columnar structure groups, a conductive layer coupled to the first columnar structure group via a contact hole provided in the inter-layer insulating layer, and a first electrode terminal electrically coupled to the conductive layer. Each of the first intermediate columnar structures includes a light propagation layer and a mask layer. Each of the second intermediate columnar structures includes an insulating layer and the mask layer. The conductive layer and the first electrode terminal partially overlap the second columnar structure group in a plan view.