Quantum Dot Light-Emitting Structure for Color Mixing Control
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Solution Overview
Problem
The existing method of manufacturing light emitting devices using quantum dot materials for color conversion in display devices faces issues with color mixing due to the excessive thinness of the black matrix, causing quantum dots to overflow and mix with adjacent solutions, resulting in unwanted color mixing and reduced color saturation.
Innovation Solution
A light emitting device design that incorporates a partition wall with a multi-layer structure and specific thickness distribution to prevent the overflow of light conversion ink, including a first and second sub-layer with varying fluorine concentrations to enhance cohesion and prevent ink overflow, and a light blocking layer to separate converted light regions and improve light purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the black matrix thickness is reduced to minimize device size, then the device becomes more compact, but the quantum dot solution overflows to adjacent openings causing color mixing
Solution Approach 1:
The partition wall is divided into multiple sub-layers (first sub-layer and second sub-layer) with different fluorine concentrations. The first sub-layer has a lower fluorine concentration (1-10 wt%) while the second sub-layer has a higher fluorine concentration (10-30 wt%). This segmentation allows each layer to perform different functions: the first layer provides baseline separation while the second layer enhances cohesion and prevents overflow, thereby maintaining color saturation without requiring excessive thickness.
Solution Approach 2:
Different regions of the partition wall are assigned different fluorine concentrations to optimize local properties. The first sub-layer uses a lower fluorine concentration suitable for the base separation function, while the second sub-layer uses a higher fluorine concentration specifically at the regions where ink overflow prevention is most critical. This local quality differentiation enables effective ink containment with minimal overall thickness.
2Manufacturing precision
If the black matrix thickness is increased to prevent ink overflow, then color mixing is reduced, but the device size increases
Solution Approach 1:
The partition wall is constructed as a composite structure combining two different materials with distinct fluorine concentrations. The first sub-layer material provides fundamental separation with lower fluorine content, while the second sub-layer material with higher fluorine content adds enhanced cohesive properties. This composite approach achieves superior ink containment performance with reduced overall thickness compared to a homogeneous structure, thereby preventing color mixing without significantly increasing device size.
3Ease of manufacture
If a single-layer partition wall is used to simplify manufacturing, then the manufacturing process is easier, but ink overflow and color mixing occur
Solution Approach 1:
The partition wall structure is modified by changing the fluorine concentration parameter across different sub-layers. The first sub-layer maintains a lower fluorine concentration (1-10 wt%) for ease of formation, while the second sub-layer increases the fluorine concentration (10-30 wt%) to enhance ink repellency and prevent overflow. This parameter variation allows the manufacturing process to remain relatively simple while achieving the required color saturation and preventing mixing.
4Manufacturing precision
If the fluorine concentration is uniformly increased throughout the partition wall to prevent ink overflow, then ink containment improves, but manufacturing complexity and material cost increase
Solution Approach 1:
The partition wall is segmented into two sub-layers with different fluorine concentrations rather than using a uniform high concentration throughout. The first sub-layer uses a moderate fluorine concentration (1-10 wt%) while the second sub-layer uses a higher concentration (10-30 wt%). This segmentation achieves effective ink containment at the critical interfaces where overflow is most likely, while avoiding the unnecessary material complexity and cost associated with uniformly high fluorine concentration throughout the entire partition wall.
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 mitigates color mixing by blocking the light conversion ink from overflowing and ensures accurate color emission, enhancing the color saturation and display quality of the light emitting device.
Implementation Method 1
the partition wall may block the light conversion ink filled in the cavity thereof from overflowing
Implementation Method 2
a light blocking layer to separate converted light regions and improve light purity
Data Source
AI summary
A light emitting device is provided and includes a substrate, a plurality of light emitting elements, an intermediate layer, a partition wall, a light conversion element, and a layer. The light emitting elements is disposed on the substrate. The intermediate layer is disposed on the light emitting elements. The partition wall is disposed on the intermediate layer, wherein the partition wall includes a plurality of partition elements. The light conversion element is disposed between two of the partition elements, wherein the light conversion element corresponds to one of the light emitting elements. The layer is disposed between the intermediate layer and the light conversion element, wherein the layer is in contact with a sidewall of the partition wall.