Micro LED Edge Layout for High-Transmittance AR Displays
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Solution Overview
Problem
The application of Micro LED technology in augmented reality (AR) and mixed reality (MR) wearable devices faces challenges such as mass transfer, improving transparency, and compatibility with existing CMOS processes, particularly in achieving high contrast and efficient power usage.
Innovation Solution
A novel Micro LED layout structure is designed with Micro LEDs arranged on the edges of display units to expose a transparent region, accompanied by pixel driver circuits, allowing for high transmittance and luminous efficacy, and a manufacturing method that integrates with existing CMOS processes to ensure compatibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Micro LEDs are arranged in a conventional full-coverage layout, then display brightness and luminous efficacy are improved, but transmittance and display quality deteriorate due to blocking of transparent regions
Solution Approach 1:
The display unit is segmented into an edge region containing Micro LEDs and a transparent region that is exposed and unobstructed. This spatial segmentation allows the edge region to provide luminous output while the transparent region maintains high transmittance, resolving the contradiction between luminous efficacy and transmittance.
Solution Approach 2:
The Micro LEDs are positioned at the edge region rather than covering the entire display area, effectively moving the light-emitting elements from a two-dimensional full-coverage layout to a one-dimensional peripheral arrangement. This dimensional change allows the central transparent region to remain unobstructed while still providing sufficient luminous output through the edge-placed LEDs.
2Illumination intensity
If Micro LEDs are placed on the edges of display units, then transmittance and display quality are improved, but manufacturing complexity increases due to precise positioning requirements
Solution Approach 1:
The substrate is pre-divided into edge regions and transparent regions before Micro LED placement. This preliminary regional definition provides clear positioning guides for the edge-placed LEDs, simplifying the manufacturing process by establishing predetermined placement zones rather than requiring complex real-time positioning adjustments.
Solution Approach 2:
Different regions of the substrate are assigned different functions: the edge region is designated for Micro LED placement with associated driver circuits, while the transparent region is optimized for light transmission. This local differentiation of quality and function simplifies manufacturing by allowing specialized processing for each region rather than uniform complex processing across the entire substrate.
3Area of stationary object
If pixel driver circuits are integrated under Micro LEDs, then device area is reduced and integration is improved, but manufacturing precision requirements increase
Solution Approach 1:
The device structure is segmented into distinct functional zones: pixel driver circuits are confined to the edge region while Micro LEDs are positioned in the transparent region. This spatial segmentation allows each component to be manufactured and positioned independently within its designated zone, reducing the overall manufacturing precision requirements compared to fully integrated under-LED circuit placement.
Solution Approach 2:
The edge region serves as an intermediary zone that houses both the pixel driver circuits and provides positioning reference for the transparent region where Micro LEDs are placed. This intermediary structure facilitates easier alignment and integration while maintaining compact device area.
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 enhances display quality with high contrast and transmittance, reduces power consumption, and allows for the use of Micro LEDs in AR/MR devices with improved manufacturing efficiency and cost-effectiveness.
Implementation Method 1
multiple Micro LEDs set on an edge region of each display unit
Implementation Method 2
exposing a transparent region surrounded by the edge region, thereby achieving better display quality with high transmittance
Data Source
AI summary
A method of manufacturing a layout structure of Micro LED for augmented reality and mixed reality is provided in the present invention, including steps of providing a substrate with multiple display units arranged thereon to form an unit array and includes an edge region and a transparent region surrounded by the edge region, forming pixel driver circuits and a first transparent layer on the edge region, setting multiple Micro LEDs on the first transparent layer of edge regions, forming a second transparent layer on the Micro LEDs and the first transparent layer, thinning and removing the substrate on the transparent region to expose the first transparent layer, and forming a protection layer on back sides of the substrate and the exposed first transparent layer.