Quantum Dot Light Diffuser Plate with Segmented Barrier Protection
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Solution Overview
Problem
Conventional quantum dot-based backlight displays are susceptible to degradation from water vapor and oxygen intrusion, leading to uneven color representation and reduced activity of quantum dots, especially at the edges, due to inadequate protection methods that fail to prevent ingress from all sides.
Innovation Solution
A quantum dot light diffuser plate with microstructures featuring convex and concave portions on its surface, where quantum dots are applied in the concave areas, and a water-blocking and gas-blocking layer covers the convex portions, preventing water vapor and oxygen from penetrating the quantum dot layer from all sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-blocking and gas-blocking film is attached on the surface of the quantum dot film, then water vapor and oxygen intrusion from the upper surface is blocked, but water vapor and oxygen can still enter from the side end faces of the quantum dot film
Solution Approach 1:
The quantum dot layer is divided into multiple independent regions by convex portions, creating isolated concave portions that hold separate quantum dot segments. This segmentation prevents water vapor and oxygen from propagating across the entire layer, as each segment is independently protected. The segmentation principle directly addresses the vulnerability of continuous quantum dot films to edge intrusion while maintaining protection simplicity.
Solution Approach 2:
A water-blocking and gas-blocking film is applied as a thin film overlay on the diffuser plate surface, conformally covering the convex portions and filling the concave portions. This thin film provides effective barrier protection against water vapor and oxygen intrusion from both upper surface and side end faces, while adding minimal complexity to the overall structure.
2Illumination intensity
If the quantum dot layer is made continuous to ensure uniform light conversion, then blue light conversion is improved, but the quantum dot layer becomes more susceptible to water vapor and oxygen intrusion from all sides
Solution Approach 1:
The quantum dot layer is segmented into multiple isolated regions by the convex portions, creating independent concave portions that hold quantum dot material. This segmentation inherently protects each region from water vapor and oxygen intrusion while maintaining sufficient light conversion area. The segmented structure eliminates the continuous pathway that allows harmful substances to affect the entire layer.
Solution Approach 2:
Different regions of the diffuser plate are given different functions: convex portions serve as protective barriers and structural supports, while concave portions contain the quantum dot material for light conversion. This local differentiation allows the system to simultaneously achieve protection and light conversion functionality without compromising either aspect.
3Reliability
If multiple protective coating processes are applied to the side end faces of the quantum dot film, then water vapor and oxygen intrusion is prevented, but the manufacturing process becomes complicated with low yield
Solution Approach 1:
The convex portions are formed on the diffuser plate before applying the quantum dot layer and water-blocking film. This preliminary structuring creates built-in protection features that eliminate the need for subsequent complex side-face coating processes. The convex portions act as pre-formed barriers that naturally prevent water vapor and oxygen intrusion without requiring additional manufacturing steps.
Solution Approach 2:
The protective function is merged into the diffuser plate structure itself through the formation of convex portions, rather than being added as a separate protective layer. This integration of protection functionality into the base structure simplifies the overall manufacturing process and improves yield by eliminating multiple coating steps while maintaining effective protection.
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 prevents degradation of quantum dots, ensuring consistent color representation and reducing production costs while maintaining high yield, by isolating the quantum dots and minimizing water vapor and oxygen ingress, thus enhancing the durability and performance of the backlight display.
Implementation Method 1
blue LEDs as light sources to excite green and red quantum dots, and the three colors of light are mixed into white light
Implementation Method 2
a water-blocking and gas-blocking layer is arranged on the upper surface of the quantum dot layer
Data Source
AI summary
The invention refers to a quantum dot light diffuser plate that can be assembled on a backlight module with blue LEDs as the bottom light source. Microstructures having concave portions and convex portions are formed on the surface of the diffuser plate. A quantum dot layer comprising green quantum dots and red quantum dots is applied only on the concave portions of the microstructures, and thus is separated by the convex portions into small parts independent of each other. A water-blocking and gas-blocking layer is arranged on the upper surface of the quantum dot layer. The water vapor and oxygen from the outside cannot penetrate the side end faces of the quantum dot layer and invade the entire quantum dot layer, such that, the diffuser plate of the invention can have the advantages of simple process, low cost and high production yield.