μ-LED Optical Structures for Directional Light and Low Crosstalk
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Solution Overview
Problem
Existing μ-LED displays face challenges in achieving high directionality and reducing the fly screen effect, which affects the visual quality and efficiency of light emission, especially in augmented reality and automotive applications.
Innovation Solution
The use of slotted antenna structures and photonic crystals to enhance light directionality and reduce crosstalk between μ-LEDs, combined with the integration of converter materials to adjust the emission spectrum and improve light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional μ-LED structures are used, then manufacturing is simpler, but light directionality is poor and fly screen effect is prominent
Solution Approach 1:
The patent segments the μ-LED structure by introducing separate photonic crystal layers and slotted antenna structures that are distinct from the basic LED chip. These segmented components work together to control light directionality independently, allowing the manufacturing process to remain relatively simple while achieving improved optical performance.
Solution Approach 2:
The patent introduces photonic crystal structures and slotted antenna structures as intermediary elements between the μ-LED light source and the external environment. These intermediaries manipulate light propagation without requiring fundamental changes to the LED manufacturing process, thus improving directionality while maintaining manufacturing simplicity.
2Illumination intensity
If μ-LEDs are placed closer together to reduce fly screen effect, then visual quality improves, but crosstalk between adjacent μ-LEDs increases
Solution Approach 1:
The patent applies local quality by making each μ-LED emit light in a highly directional manner using photonic crystals and slotted antennas. This localized control of light emission direction ensures that light from one μ-LED does not interfere with adjacent μ-LEDs, enabling closer spacing without crosstalk while improving visual quality.
Solution Approach 2:
The patent addresses crosstalk by controlling light propagation in the angular dimension through photonic crystal structures. By confining light emission to specific angles, the patent effectively adds directional control as another dimension of management, allowing μ-LEDs to be placed closer together without lateral light interference.
3Productivity
If converter materials are integrated to adjust emission spectrum, then light extraction efficiency improves, but device structure becomes more complex
Solution Approach 1:
The patent merges the converter material integration with the existing μ-LED structure by incorporating converters into the light extraction path. This merging approach allows spectrum adjustment and improved light extraction without requiring completely separate systems, thus enhancing productivity while managing integration complexity.
Solution Approach 2:
The patent implements multi-functionality by designing the μ-LED structure to simultaneously achieve light emission, spectrum conversion, and directional control. The photonic crystal structures and slotted antennas serve multiple functions including light extraction enhancement and beam shaping, reducing the need for additional separate components and managing overall device 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
This approach results in improved light directionality, reduced fly screen effect, and enhanced visual quality, while also increasing the efficiency and longevity of μ-LED displays.
Implementation Method 1
The use of slotted antenna structures and photonic crystals to enhance light directionality and reduce crosstalk between μ-LEDs
Implementation Method 2
The use of slotted antenna structures and photonic crystals to enhance light directionality and reduce crosstalk between μ-LEDs
Implementation Method 3
combined with the integration of converter materials to adjust the emission spectrum and improve light extraction
Data Source
AI summary
The invention relates to various aspects of a μ-LED or a μ-LED array for augmented reality or lighting applications, in particular in the automotive field. The μ-LED is characterized by particularly small dimensions in the range of a few μm.