Quantum Dot Light Conversion Cavities to Prevent Color Mixing
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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 overflow of quantum dot solutions from one opening to adjacent openings, resulting in undesired color mixing and reduced color saturation.
Innovation Solution
A light emitting device design that incorporates a partition wall with a multi-layer structure and increased thickness to prevent the overflow of light conversion ink, featuring a substrate with light emitting elements, a light conversion element, an encapsulation layer, and a protection layer, where the partition wall defines cavities to contain the light conversion ink and separate color regions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the black matrix thickness is kept low, then the manufacturing process is simpler and cost is reduced, but the quantum dot solution overflows to adjacent openings causing color mixing
Solution Approach 1:
The black matrix is segmented into multiple layers (first black matrix layer and second black matrix layer) with different functions. The first layer provides basic light blocking, while the second layer specifically prevents solution overflow. This segmentation allows each layer to be optimized for its specific function, maintaining manufacturing simplicity while improving color separation precision.
2Manufacturing precision
If the black matrix thickness is increased to prevent overflow, then color mixing is reduced, but the manufacturing complexity and cost increase
Solution Approach 1:
Instead of using a single thick black matrix layer, the structure is segmented into multiple thinner layers. The first black matrix layer has thickness of 50-200nm and the second layer has thickness of 20-100nm. This segmentation reduces the complexity of controlling single-layer thickness while achieving the same or better overflow prevention effect.
Solution Approach 2:
The first black matrix layer acts as an intermediary between the substrate and the second black matrix layer. It provides initial light blocking and creates a foundation that reduces the burden on the second layer, allowing the second layer to focus specifically on preventing solution overflow with reduced thickness requirements.
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 containing the light conversion ink within designated cavities, enhancing color saturation and display quality by ensuring precise color emission from each light emitting element.
Implementation Method 1
The partition wall defines a plurality of cavities, and one of the cavities corresponds to one of the light emitting elements. The light conversion element is disposed in the one of the cavities.
Implementation Method 2
Because the quantum dot materials can convert the light emitted from the light emitting element to the light with the required color
Data Source
AI summary
The present disclosure provides a light emitting device including a substrate, a plurality of light emitting elements disposed on the substrate, a partition wall disposed on the substrate, a light conversion element, an encapsulation layer disposed on the light emitting element, an intermediate layer disposed between the light conversion element and one of the light emitting elements, and a protection layer disposed between the intermediate layer and the light emitting elements. The partition wall defines a plurality of cavities, and one of the cavities corresponds to one of the light emitting elements. The light conversion element is disposed in the one of the cavities.