Nanowire LED Transition Zones to Suppress Edge Effects
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Solution Overview
Problem
Current display screens using LEDs with nanowires suffer from abrupt transition zones between sub-pixels, leading to symmetry breaks and detrimental edge effects, which limit the optical cavity effect and restrict the color gamut to a narrow range of colors obtainable by linear combinations of red, green, and blue sub-pixels.
Innovation Solution
The introduction of a transition zone with nanowires of varying diameters and distances that gradually change by specific proportions, avoiding abrupt transitions and allowing for a broader range of colors by emitting a distinct transition wavelength, thereby extending the color gamut beyond the traditional RGB limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If abrupt transition zones are used between sub-pixels, then manufacturing is simpler, but symmetry breaks and edge effects occur that limit optical cavity effect and color gamut
Solution Approach 1:
The transition zone is divided into multiple sub-zones with progressively changing nanowire diameters. Each sub-zone has locally optimized nanowire dimensions that gradually transition from the first sub-pixel to the second sub-pixel, maintaining local symmetry and preventing abrupt edge effects while enabling the optical cavity effect to function properly across the transition region.
Solution Approach 2:
The transition zone is segmented into multiple discrete sub-zones rather than being a single abrupt boundary. This segmentation allows the nanowire diameter to change incrementally across sub-zones, maintaining symmetry at each interface and preventing the formation of detrimental edge effects that would occur with a single abrupt transition.
2Device complexity
If abrupt transition zones are used between sub-pixels, then device structure is simpler, but color gamut is restricted to narrow RGB range
Solution Approach 1:
Different sub-zones within the transition zone have locally optimized nanowire diameters tailored to emit specific wavelengths. This local differentiation allows the transition zone to emit a broader spectrum of colors beyond the traditional RGB gamut, with each sub-zone contributing to a wider color range while maintaining overall structural simplicity.
Solution Approach 2:
The nanowire diameter parameter is systematically varied across different sub-zones of the transition zone. By changing this geometric parameter progressively, the emission wavelength is tuned across a broader spectrum, enabling the device to achieve an extended color gamut that exceeds conventional RGB limitations without increasing overall device complexity.
3Adaptability or versatility
If nanowire diameters vary significantly in transition zone, then color gamut expands, but manufacturing precision requirements increase
Solution Approach 1:
The transition zone is divided into multiple sub-zones with moderate diameter variations within each sub-zone. This segmentation breaks down the total diameter change into smaller, more manageable steps, allowing standard manufacturing processes to achieve the required precision for each sub-zone while collectively achieving the broader color gamut across the entire transition zone.
Solution Approach 2:
Instead of attempting to achieve the full color gamut expansion in a single abrupt transition, the invention uses multiple sub-zones with partial diameter variations. Each sub-zone achieves a portion of the total wavelength transition, and the cumulative effect of these partial actions achieves the extended color gamut while maintaining manufacturable precision requirements for each individual sub-zone.
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 solution prevents symmetry breaks and edge effects, enabling a wider range of colors to be rendered by allowing the transition zone to emit a distinct wavelength, thus expanding the color gamut beyond the typical RGB limitations.
Implementation Method 1
Each color pixel generally comprises at least three components for emitting and/or converting a luminous flux
Implementation Method 2
An LED or micro-LED is used to emit the light flux associated with a sub-pixel. An LED may in particular comprise a plurality of active nanowires arranged in a periodic photonic crystal and emitting said light flux at the desired wavelength
Data Source
Figure 1~2
Figure 3~4A
Figure 4B~5
AI summary
The invention relates to an optoelectronic device (1) comprising at least: - a first LED (100) comprising first nanowires (101) having first diameters having a value substantially equal to a first target diameter ϕ10, said first nanowires (101) being arranged according to at least a first step lattice having a value substantially equal to a first target distance p10,x, said first LED (100) being configured to emit a first light beam having mainly a first wavelength λ1; and - a first transition zone (1000) bordering at least in part said first LED (100), said first transition zone (1000) comprising a plurality of first transition nanowires (1001); the device being characterized in that the first transition nanowires (1001) have first transition diameters and/or a first transition lattice step varying progressively with respect to moving away from the first LED (100).