Color Conversion Substrate Sealing for Quantum Dot Stability
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Solution Overview
Problem
Quantum dots (QDs) used in color conversion substrates for display devices face stability issues due to exposure to oxygen and moisture, leading to reduced color conversion efficiency and changes in color coordinates, necessitating long-term thermal stability and isolation from the external environment.
Innovation Solution
A color conversion substrate is designed with a thin glass plate, a QD coating layer, a light guide plate, and a sealant to isolate the QD coating layer from the external environment, featuring embossed patterns to enhance light scattering and conversion efficiency, and optionally includes a moisture absorber to prevent moisture exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If QDs are exposed to external air gap, then manufacturing process is simplified, but color conversion efficiency deteriorates and color coordinates change due to oxygen and moisture exposure
Solution Approach 1:
The patent introduces a sealing structure comprising a sealant layer and a protective layer as an intermediary between the QD coating layer and the external environment. This mediator prevents direct contact between oxygen/moisture and QDs while maintaining manufacturing feasibility, thereby resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent creates an inert environment by sealing the QD coating layer within a protective structure that excludes oxygen and moisture. This inert atmosphere protection allows the QDs to maintain their color conversion efficiency and color coordinates without degradation, solving the reliability issue while keeping the manufacturing process practical.
2Reliability
If sealing structure is added to protect QDs, then color conversion efficiency stability is improved, but device complexity increases
Solution Approach 1:
The patent employs thin film structures for the sealant layer and protective layer, which provide effective sealing and protection against oxygen and moisture while maintaining a compact and relatively simple overall device structure. This approach improves QD stability without excessively increasing device complexity.
Solution Approach 2:
The sealing structure serves multiple functions simultaneously: it provides mechanical protection, chemical isolation from oxygen and moisture, and structural support. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving reliable QD protection.
3Reliability
If more LEDs are used to compensate for QD degradation, then color conversion efficiency is maintained, but energy consumption increases
Solution Approach 1:
The patent applies preliminary protection measures by sealing the QD coating layer before any degradation can occur. This preventive action maintains high color conversion efficiency throughout the device lifetime, eliminating the need to increase LED quantity or power consumption to compensate for QD degradation.
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 provides long-term stability and improved color conversion efficiency for QDs, reducing the number of LEDs required and energy consumption, resulting in a high-efficient and environmentally friendly display device.
Implementation Method 1
a sealant disposed between the thin glass plate and the light guide plate to isolate the QD coating layer from an external environment
Implementation Method 2
The QD coating layer may have an embossed pattern on a surface thereof facing the light guide plate
Data Source
AI summary
The present invention relates to a substrate for color conversion, a manufacturing method therefor, and a display device comprising the same and, more specifically, to a substrate for color conversion for not only securing the long-term stability of quantum dots but also exhibiting excellent color conversion efficiency, a manufacturing method therefor, and a display device comprising the same. To this end, the present invention provides a substrate for color conversion, a manufacturing method therefor, and a display device, the substrate for color conversion comprising: a thin plate glass; a coating layer for quantum dots formed on one surface of the thin plate glass; a light guide plate disposed to face the coating layer for quantum dots, a light emitting diode being disposed on the sides thereof; and a sealing material which is formed between the thin plate glass and the light guide plate and which blocks the coating layer for quantum dots from the outside.