Micro LED Pixel Resonance Structure for Low-Crosstalk Color Purity
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Solution Overview
Problem
High-resolution micro LED displays face issues with light emission spreading between neighboring pixels, leading to color purity deterioration and unstable electrical connections due to thermal mismatches during manufacturing.
Innovation Solution
A display apparatus design featuring a substrate with a driving layer, semiconductor layers, and a reflective layer with a distributed Bragg reflector, along with an isolation structure and current spreading layers, to reduce beam divergence and enhance color purity, while using a CMOS backplane and fusion bonding methods for manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pitch between neighboring pixels is decreased to increase resolution, then the resolution is improved, but light emitted from pixels spreads to neighboring pixels causing color purity deterioration
Solution Approach 1:
The patent divides the light emission control into individual pixel segments using isolation structures. These structures physically separate adjacent pixels, preventing light from one pixel from spreading to neighboring pixels. This segmentation approach enables higher resolution with smaller pixel pitch while maintaining color purity by eliminating crosstalk between pixels.
Solution Approach 2:
The patent introduces isolation structures as intermediary elements between adjacent pixels. These structures act as barriers that block light propagation between pixels, serving as a mediator that prevents the harmful light spread effect while allowing the pixels to be positioned closer together for higher resolution.
2Ease of manufacture
If driving elements and LEDs are manufactured separately and bonded together, then manufacturing flexibility is improved, but defects are formed in electrical connection portions during bonding
Solution Approach 1:
The patent merges the driving element and LED into a single integrated structure, eliminating the need for separate bonding processes. The driving element is directly formed on the same substrate as the LED, creating monolithic electrical connections that avoid defects associated with bonding interfaces. This integration maintains manufacturing flexibility while significantly improving electrical connection reliability.
3Device complexity
If driving elements and LEDs are bonded together, then device assembly is simplified, but unstable bonds are formed because of thermal mismatches
Solution Approach 1:
The patent combines the driving element and LED fabrication into a single monolithic process on the same substrate. This eliminates thermal mismatch issues that arise from bonding dissimilar materials with different thermal expansion coefficients. The integrated structure maintains assembly simplicity while ensuring stable, defect-free electrical connections without thermal stress.
4Object-affected harmful factors
If mesa structures are used for isolation, then pixel isolation is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses simplified isolation structures that segment pixels without requiring complex mesa formations. These isolation structures achieve effective pixel separation with fewer manufacturing steps and less structural complexity than traditional mesa approaches, reducing crosstalk while maintaining manufacturability.
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
The solution effectively reduces crosstalk between pixels, increases color purity, and simplifies the manufacturing process by minimizing mesa structures and thermal mismatch issues, resulting in improved light emission efficiency and higher resolution displays.
Implementation Method 1
The reflective layer may include a distributed Bragg reflector. The distributed Bragg reflector may include first layers having a first refractive index and second layers having a second refractive index that are alternately provided
Implementation Method 2
light emitted from the active layer resonates between the first electrode and the reflective layer
Implementation Method 3
The isolation structure may include an ion-implanted region
Data Source
AI summary
Provided is a display apparatus including a plurality of subpixels and configured to emit light based on each of the plurality of subpixels, the display apparatus including a substrate, a driving layer provided on the substrate and including a driving element which is configured to apply current to the display apparatus, a first electrode electrically connected to the driving layer, a first semiconductor layer provided on the first electrode, an active layer provided on the first semiconductor layer, a second semiconductor layer provided on the active layer, a second electrode provided on the second semiconductor layer, and a reflective layer provided on the second semiconductor layer, wherein light emitted from the active layer resonates between the first electrode and the reflective layer.