Back-Emission MicroLED Display Structure With One-Sided Backplane Assembly
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Solution Overview
Problem
Conventional microLED displays require complex and costly processing on both sides of the backplane, leading to high costs and yield losses, and suffer from light leakage issues due to front emission designs, which complicates the integration of interconnects and increases manufacturing costs.
Innovation Solution
A back emission microLED display structure with emission from the back side of a transparent substrate, allowing for fluidic assembly and processing on one side, incorporating reflectors to direct light towards the viewer and simplify the fabrication of microLED displays with all interconnections on one side of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional front emission microLED display design is used, then light can be emitted directly to the viewer, but light leakage occurs and complex processing on both sides of the backplane is required
Solution Approach 1:
The patent inverts the conventional front emission design by implementing back emission, where microLEDs emit light toward the backplane and reflectors direct it forward. This inversion eliminates light leakage through the front substrate and allows all processing to occur on one side of the backplane, reducing manufacturing complexity while maintaining viewing performance
2Ease of manufacture
If all interconnects and processing are performed on one side of the backplane, then manufacturing complexity and costs are reduced, but light direction control becomes more challenging
Solution Approach 1:
The patent introduces reflectors as intermediary elements between the microLEDs and the viewer. These reflectors mediate the light path by capturing light emitted toward the backplane and redirecting it forward through apertures in the transparent substrate, thereby simplifying manufacturing while maintaining effective light direction control
3Use of energy by moving object
If reflectors are incorporated to direct light towards the viewer, then light efficiency is enhanced, but device structure becomes more complex
Solution Approach 1:
The patent merges the reflector structure with the backplane itself, integrating light-directing functionality into the existing structural component. By combining these functions, the patent enhances light efficiency while minimizing additional structural complexity, as the reflectors become part of the backplane assembly rather than separate add-on components
4Object-generated harmful factors
If back emission design is used, then light leakage is eliminated, but the transparent substrate must be precisely engineered for optimal light transmission
Solution Approach 1:
The patent applies local quality by creating specific regions in the transparent substrate with different optical properties. Apertures are strategically positioned and sized to allow controlled light transmission from the reflectors, while other regions maintain transparency for viewing. This localized engineering eliminates light leakage in critical areas while preserving optical performance in viewing areas
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 reduces manufacturing complexity and costs by enabling all processing and interconnection on one side of the backplane, enhances light efficiency by directing emitted light towards the viewer, and eliminates light leakage issues, making it suitable for large-area displays with reduced bezel width.
Implementation Method 1
the reflector is positioned to direct the light away from the substrate
Data Source
AI summary
Disclosed herein is a micro light emitting diode (microLED) display structure with emission from the back side of a transparent substrate, which can be manufactured by fluidic assembly. The architecture allows microLED displays or display tiles to be fabricated simply, with processing and interconnection only on one side of the backplane. The structure may incorporate reflectors in the fluidic assembly structures to direct substantially all of the emitted light toward the viewer. Also disclosed are microLEDs and emission backplanes designed to support a back emission display.