Honeycomb Micro-LED Pixel Structure for Light Crosstalk Control
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Solution Overview
Problem
Display devices using micro LEDs with honeycomb structures face issues of light crosstalk, color purity, increased material costs, and reduced light uniformity due to the diffusion layer in unit pixel areas.
Innovation Solution
A display device design featuring a substrate with hexagonal unit pixel areas, a porous layer with through-holes on the partition wall to prevent light mixing, and a color filter layer to enhance light straightness and color purity, utilizing Anodized Aluminum Oxide (AAO) for the porous layer and specific color filters for each pixel area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diffusion layer is disposed in the unit pixel area of honeycomb structure, then light crosstalk is generated, but manufacturing process is simplified
Solution Approach 1:
The invention divides the unit pixel area into multiple sub-regions using partition walls, creating separated emission zones. This segmentation prevents light crosstalk between adjacent pixels while maintaining the honeycomb structure's manufacturing advantages. Each partitioned region contains a light emitting device with its color conversion layer, isolated from neighboring pixels.
Solution Approach 2:
The invention introduces a porous layer as an intermediary component between the partition wall and the color filter layer. This porous layer with controlled porosity (30-70%) acts as a light management medium that prevents crosstalk while allowing desired light transmission, resolving the contradiction between crosstalk prevention and manufacturing simplicity.
2Manufacturing precision
If color conversion layer is placed close to semiconductor light emitting device, then color purity is improved, but light mixing between pixels increases
Solution Approach 1:
The partition wall structure divides the display into isolated pixel regions, allowing each color conversion layer to be positioned close to its corresponding light emitting device without causing crosstalk. The physical separation created by partition walls enables precise color conversion while preventing light mixing between adjacent pixels.
Solution Approach 2:
The invention applies different properties to different regions: the partition wall provides optical isolation with specific material composition, the porous layer provides controlled porosity (30-70%) for light management, and the color filter layer provides wavelength-specific filtering. This localized optimization achieves both color purity and crosstalk prevention.
3Reliability
If porous layer with through-holes is added to prevent light mixing, then crosstalk is reduced, but device complexity increases
Solution Approach 1:
The porous layer serves multiple functions simultaneously: it acts as a light scattering medium to prevent crosstalk, provides mechanical support between layers, and controls light extraction efficiency. This multi-functionality reduces the need for additional separate components, offsetting the complexity increase with functional consolidation.
Solution Approach 2:
The invention utilizes a porous layer with controlled porosity (30-70%) as a key functional component. The porous structure provides unique optical properties for light management and crosstalk prevention that cannot be achieved with solid materials, enabling effective light control while maintaining a relatively simple layered structure.
4Loss of substance
If partition wall material is reduced to lower costs, then material costs decrease, but light uniformity deteriorates
Solution Approach 1:
The partition wall is constructed using composite material composition (organic-inorganic hybrid) that provides both mechanical integrity for structural support and optical properties for light management. This composite structure achieves cost reduction through material optimization while maintaining light uniformity through controlled optical characteristics.
Solution Approach 2:
The invention optimizes partition wall parameters including thickness (1-10 μm), material composition, and refractive index to achieve the desired balance between cost and performance. By carefully controlling these parameters, the partition wall provides sufficient light isolation and uniformity while minimizing material usage and cost.
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 prevents light crosstalk, improves color purity, reduces material costs by minimizing the dielectric or black matrix material needed, and achieves better light uniformity compared to square structures, while maintaining optimal luminance in a honeycomb pixel structure.
Implementation Method 1
a color conversion layer converting light emitted from the semiconductor light emitting device into a color corresponding to each of the unit pixel areas
Implementation Method 2
The porous layer may prevent lights emitted from the unit pixel areas from being mixed
Implementation Method 3
a color filter layer located on the porous layer
Data Source
AI summary
The present invention is applicable to display device-related technical fields and relates to, for example, a display device using a micro light-emitting diode (LED). The present invention may comprise: a substrate; partition walls which are arranged on the substrate to define a plurality of hexagonal unit pixel areas forming a honeycomb shape; semiconductor light-emitting elements each of which is disposed in each of the unit pixel areas to form each unit pixel; color conversion layers which convert light emitted from the semiconductor light-emitting elements into colors corresponding to the respective unit pixel areas; a porous layer which is disposed on the partition walls and in which a plurality of through-holes are formed; and color filter layers which are disposed on the porous layer.