Display Panel Color Conversion Layout for Light Extraction
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Solution Overview
Problem
Conventional LED panels face challenges in achieving both high color conversion efficiency and light extraction efficiency due to the increased thickness of the color conversion layer, which complicates fabrication and degrades light extraction efficiency.
Innovation Solution
A display panel design featuring a segmented color conversion pattern with overlapping first and second portions on separate substrates, allowing for reduced bank structure height and improved light extraction efficiency while maintaining color conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the color conversion layer is increased to achieve good light conversion efficiency, then color conversion efficiency is improved, but fabrication difficulty increases and light extraction efficiency degrades
Solution Approach 1:
The color conversion layer is divided into multiple segments arranged in a staggered configuration. Specifically, the color conversion layer includes a first color conversion layer and a second color conversion layer that are offset from each other, allowing each layer to be thinner while collectively providing sufficient color conversion efficiency. This segmentation resolves the contradiction by achieving the required optical performance without increasing the thickness of individual layers, thereby simplifying fabrication and improving light extraction.
Solution Approach 2:
The patent introduces a lateral offset arrangement between color conversion layers of different colors (e.g., red and green layers are staggered). This dimensional repositioning allows light to pass through multiple layers without requiring excessive thickness in any single layer, thus maintaining color conversion efficiency while improving light extraction and reducing fabrication complexity.
2Reliability
If the thickness of the color conversion layer is increased to achieve good light conversion efficiency, then color conversion efficiency is improved, but light extraction efficiency degrades
Solution Approach 1:
By dividing the color conversion layer into multiple thinner staggered layers, the patent reduces the total optical path length that converted light must traverse, thereby minimizing absorption losses and improving light extraction efficiency while maintaining adequate color conversion through the distributed layer structure.
Solution Approach 2:
The staggered arrangement of color conversion layers is designed in advance to optimize light extraction paths. The offset configuration ensures that light converted in one layer can escape more easily by not having to pass through the full thickness of subsequent layers, thus preliminarily optimizing the extraction efficiency before light loss occurs.
3Reliability
If the thickness of the color conversion layer is increased, then color conversion efficiency is improved, but device complexity increases
Solution Approach 1:
The color conversion layer is segmented into multiple offset sub-layers, each with reduced thickness. This segmentation simplifies the bank structure requirements because each individual layer can be formed with standard thin-film techniques, avoiding the need for complex high-aspect-ratio structures that would be required if a single thick layer were used.
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 segmented design enhances light extraction efficiency and reduces manufacturing complexity, thereby increasing production yield and process margin.
Implementation Method 1
different display pixels may be configured with different color conversion layers based on their respective display colors and operate under illumination from LEDs of the same color
Data Source
AI summary
A display panel including a first substrate, a second substrate, a first bank structure, a second bank structure, a light-emitting element, and a color conversion pattern is provided. The first bank structure is disposed on the first substrate. The second bank structure is disposed on the second substrate. The light-emitting element is disposed in a first accommodation space defined by the first bank structure. The color conversion pattern includes a first portion and a second portion overlapping each other and separated from each other. The first portion is disposed on the first substrate and covers the light-emitting element. The second portion is disposed on the second substrate and located in a second accommodation space defined by the second bank structure. In a direction perpendicular to a stacking direction of the two substrates, a second width of the second portion is less than a first width of the first portion.