Mini-Pixel LED Array Structure for High-Luminance Vehicle Displays
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Solution Overview
Problem
Existing vehicular lighting systems using packaged LEDs face limitations in luminance due to design choices, which prevents their use in high definition micro-LED lighting applications such as dynamic daytime running lights and adaptive driving beam headlights.
Innovation Solution
The development of a vehicular lighting system utilizing high density mini-pixel LEDs with a multi-quantum well stack, nano-pattern light extractor, and lateral light confinement distributed Bragg reflector mirror, which enhances light extraction and luminance while reducing side pump light leak.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If packaged LEDs are used in vehicular lighting systems, then the structure is simple and ease of manufacture is improved, but luminance is limited and high definition micro-LED lighting applications cannot be achieved
Solution Approach 1:
The LED structure is segmented into distinct functional layers including a multi-quantum well stack electrified by p-type and n-type materials, with separate components for light extraction and lateral light confinement. This segmentation allows optimization of each layer's function to achieve high luminance while maintaining manufacturability through standardized layer fabrication processes.
Solution Approach 2:
Different regions of the LED structure are assigned different properties: the multi-quantum well stack provides high luminance generation, the nano-pattern light extractor enhances light extraction efficiency at specific interfaces, and the lateral light confinement distributed Bragg reflector mirror directs light in specific directions. This local optimization of properties enables high definition micro-LED lighting applications.
2Illumination intensity
If conventional LED structures are used, then device complexity is low, but light extraction efficiency is limited and color uniformity is poor
Solution Approach 1:
The LED structure employs a multi-quantum well stack with optimized layer thicknesses and compositions to control light emission characteristics. The nano-pattern light extractor and lateral light confinement distributed Bragg reflector mirror are designed with specific structural parameters to enhance light extraction efficiency and ensure uniform color distribution across the LED output.
3Illumination intensity
If diffusers are used to improve light distribution, then illumination uniformity is improved, but power consumption increases and yield decreases
Solution Approach 1:
The patent removes the need for external diffusers by integrating light extraction functionality directly into the LED structure through a nano-pattern light extractor. This extraction approach achieves uniform illumination without the additional power consumption and yield reduction associated with separate diffuser components.
Solution Approach 2:
The lateral light confinement distributed Bragg reflector mirror acts as an intermediary element that redirects and distributes light uniformly without requiring external diffusers. This mediator structure achieves illumination uniformity while maintaining energy efficiency and manufacturing yield.
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 achieves higher luminance and improved color uniformity, enabling the use of high definition micro-LED lighting in automotive applications, while also reducing power consumption and increasing yield through reduced diffuser requirements.
Implementation Method 1
at least one light emitting diode chip mini-pixel that includes a multi-quantum well stack electrified by a p-type material, an n-type material, and a plurality of electrodes
Implementation Method 2
The at least one light emitting diode chip mini-pixel emits light to illuminate an area exterior of the vehicle
Implementation Method 3
lateral light confinement distributed Bragg reflector mirror
Implementation Method 4
nano-pattern light extractor
Data Source
AI summary
A vehicular lighting system includes at least one light emitting diode chip mini-pixel that has (i) a multi-quantum well stack electrified by a p-type material, an n-type material, and a plurality of electrodes, (ii) a nano-pattern light extractor and (iii) a lateral light confinement distributed Bragg reflector mirror. The at least one light emitting diode chip mini-pixel emits light to illuminate an area exterior or interior of a vehicle equipped with the vehicular lighting system.