Nanorod LED Pyramidal Structure for Wavelength Shift Reduction
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Solution Overview
Problem
Existing display apparatuses face challenges in maintaining high resolution and color reproducibility due to increased manufacturing costs and wavelength variations caused by current injection in LEDs.
Innovation Solution
The development of nanorod LEDs with a pyramidal structure, comprising a first-type semiconductor layer, a nitride light emitting layer, and a second-type semiconductor layer, stacked to form a nanorod, which includes a semi-polar plane to reduce wavelength variation and improve color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional LEDs are used in display apparatuses, then manufacturing costs increase, but color reproducibility deteriorates due to wavelength variations caused by current injection
Solution Approach 1:
The patent changes the geometric parameters of the LED structure by introducing a pyramidal shape with specific angle ranges (30-60 degrees for side faces, 10-45 degrees for apex angle). This parameter change modifies the current distribution and reduces wavelength shifts, thereby improving color reproducibility while maintaining manufacturing feasibility through conventional semiconductor processing techniques
Solution Approach 2:
The patent employs asymmetric pyramidal structures instead of symmetric conventional LED geometries. The pyramidal shape with inclined side faces creates asymmetric current paths that reduce the impact of current-induced wavelength variations, improving color stability without requiring complex manufacturing processes
2Manufacturing precision
If pixel size is reduced to achieve high resolution, then display quality improves, but manufacturing complexity increases
Solution Approach 1:
The patent segments the LED structure into distinct functional layers (n-type semiconductor layer, active layer, p-type semiconductor layer) arranged in a pyramidal configuration. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall compactness, enabling high resolution without proportionally increasing manufacturing complexity
Solution Approach 2:
The patent transitions from planar LED structures to three-dimensional pyramidal structures. By utilizing the vertical dimension and creating inclined side faces, the design achieves higher light extraction efficiency and better color control in a compact footprint, allowing high resolution displays without linearly increasing 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 nanorod LEDs enhance color reproducibility and reduce manufacturing costs by minimizing wavelength shifts due to current injection, enabling high-resolution displays without the need for color filters.
Implementation Method 1
a nitride light emitting layer provided on the pyramidal structure
Data Source
AI summary
Provided are nanorod light emitting diodes (LEDs), display apparatuses, and manufacturing methods thereof. The nanorod LED includes a first-type semiconductor layer including a body and a pyramidal structure continuously provided from the body, a nitride light emitting layer provided on the pyramidal structure, and a second-type semiconductor layer provided in the nitride light emitting layer.