Micro LED Display Stack for Ambient Light Suppression
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Solution Overview
Problem
Conventional micro LED display devices face issues with reduced contrast ratio and insufficient blackness due to ambient light reflection, which degrades image quality, as they rely on a single reflective layer and black banks that can absorb desired light rays while allowing undesired ones to pass through.
Innovation Solution
A micro LED display device configuration featuring a reflective layer and a black layer sequentially stacked with reflective banks and black banks, where the black layer is added above the reflective layer to suppress ambient light reflection, and the reflective banks are positioned below the black banks to funnel emitted photons towards a designated direction, improving luminance and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single reflective layer and black banks are used, then the device structure is simple, but ambient light reflection reduces contrast ratio and blackness
Solution Approach 1:
The reflective layer is segmented into multiple reflective layers and reflective banks at different positions and orientations. This segmentation allows each layer to reflect light from different angles, collectively covering a broader range of ambient light directions and improving contrast ratio without requiring excessive complexity in any single layer.
Solution Approach 2:
Multiple reflective layers are nested within each other at different depths and orientations. The first reflective layer is positioned at a baseline depth, while subsequent layers are nested at greater depths with different reflective orientations. This nested arrangement enables progressive reflection of ambient light from multiple angles, enhancing blackness and contrast ratio while maintaining manageable structural complexity.
2Manufacturing precision
If multiple reflective layers and banks are added to suppress ambient light reflection, then contrast ratio and blackness improve, but device complexity increases
Solution Approach 1:
Each reflective layer and bank is positioned with specific local properties including depth, orientation, and reflectivity characteristics tailored to address particular ambient light angles. The first reflective layer handles primary reflection angles, while nested layers at greater depths address secondary angles, creating locally optimized reflection zones that collectively improve contrast ratio without uniformly increasing complexity throughout the entire structure.
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 configuration effectively suppresses ambient light reflection, enhances luminance, and improves the contrast ratio and blackness, resulting in a higher-quality image by ensuring that emitted photons are directed appropriately and unwanted ambient light is absorbed.
Implementation Method 1
a reflective layer and a black layer sequentially stacked on the substrate, the reflective layer and the black layer cover a surface of the substrate... a plurality of reflective banks and a plurality of black banks sequentially disposed on the black layer and exposing the top surface of the plurality of micro light-emitting diodes, wherein the reflective layer, the black layer, the plurality of reflective banks, and the plurality of black banks overlap each other in a display direction
Implementation Method 2
the black layer is added above the reflective layer to suppress ambient light reflection... the plurality of black banks sequentially disposed on the black layer... ensuring that emitted photons are directed appropriately and unwanted ambient light is absorbed
Implementation Method 3
Color-conversion materials are quantum dots (QD) that consist of semiconductor particles of II-VI or III-V group elements. The emitting light color of the color-conversion materials may be adjusted through the dimension, structure, or composition of the color-conversion material, in order to achieve higher color-conversion efficiency
Data Source
AI summary
A micro LED display device includes: a substrate; a plurality of micro light-emitting diodes disposed on the substrate; and a reflective layer and a black layer sequentially stacked on the substrate. The reflective layer and the black layer cover a surface of the substrate, wherein a top surface of the plurality of micro light-emitting diodes is exposed through the reflective layer and the black layer. A plurality of reflective banks and a plurality of black banks are sequentially disposed on the black layer and exposing the plurality of micro light-emitting diodes; and a color-conversion material covers the top surface of at least one of the plurality of micro light-emitting diodes. The color-conversion material is laterally disposed between the plurality of reflective banks. The reflective layer, the black layer, the plurality of reflective banks, and the plurality of black banks overlap each other in a display direction.