Phosphor Sheet Moisture Barrier Design
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Solution Overview
Problem
Phosphor-containing sheets in display units are prone to moisture ingress, which degrades their wavelength conversion function, and existing technologies fail to provide high luminous efficiency, color purity, and wide color reproduction ranges demanded by modern display requirements.
Innovation Solution
A phosphor sheet with a stacked structure comprising a first phosphor layer sandwiched between transparent films, a seal layer covering the end face and periphery, and a second phosphor layer on the seal layer, preventing moisture ingress and enabling efficient wavelength conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phosphor-containing sheet is used for wavelength conversion, then luminous efficiency and color purity are improved, but moisture ingress degrades the phosphor material quality and wavelength conversion function
Solution Approach 1:
The phosphor layer is nested between two transparent films, forming a sandwich structure that encapsulates the phosphor material. This nested configuration provides physical protection against moisture ingress while maintaining the wavelength conversion function of the phosphor layer.
Solution Approach 2:
Two transparent films are used to encapsulate the phosphor layer, creating a moisture barrier. The thin films provide protection against moisture ingress while allowing light transmission for the wavelength conversion process to function effectively.
2Reliability
If the phosphor layer is fully sealed to prevent moisture ingress, then reliability is improved, but light extraction efficiency may be reduced due to blocked light paths
Solution Approach 1:
The seal layer is applied selectively to specific regions rather than uniformly across the entire phosphor sheet. The seal layer covers the phosphor layer in regions where moisture protection is critical while leaving other regions open for optimal light extraction, creating different functional zones within the same structure.
3Reliability
If a seal layer is added to protect the phosphor layer, then moisture resistance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
A thin film seal layer is used to protect the phosphor layer from moisture. The thin film structure provides effective moisture barrier functionality while adding minimal structural complexity and maintaining ease of manufacturing compared to thicker or more complex sealing structures.
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 moisture from entering the phosphor layer, maintaining high luminous efficiency and color purity while expanding the color reproduction range, resulting in improved display performance.
Implementation Method 1
a phosphor sheet containing a phosphor that fluoresces when irradiated with light
Data Source
AI summary
A phosphor sheet includes: a stacked structure including a first phosphor layer and a pair of transparent films each being in contact with either side of the first phosphor layer; a seal layer integrally covering an area from an end face of the stacked structure to a periphery of the stacked structure; and a second phosphor layer further covering a portion of the seal layer, the portion covering at least the periphery of the stacked structure.