Thin Wavelength Conversion Member with Barrier Layer
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Solution Overview
Problem
Thin wavelength conversion members in liquid crystal display devices tend to experience non-light emission failure due to reduced stiffness and deformation, leading to damage of the barrier layer and subsequent oxygen/water invasion, which affects the quantum dots.
Innovation Solution
A wavelength conversion member with a total thickness of 120 μm or less, incorporating a barrier layer made of inorganic oxides like silicon oxide or aluminum oxide, and a support with a specific elastic modulus and thickness, along with an organic layer, to enhance rub and bend resistance, thereby reducing deformation and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the wavelength conversion member is reduced, then the overall device thickness is reduced, but the member becomes prone to deformation and non-light emission failure
Solution Approach 1:
The wavelength conversion member is divided into multiple functional layers: a support layer providing mechanical strength, a barrier layer preventing oxygen/water invasion, and a wavelength conversion layer containing quantum dots. This segmentation allows each layer to specialize in its function while working together to solve the thickness-reliability contradiction.
Solution Approach 2:
The invention uses composite material structure combining different materials with complementary properties: the support layer uses materials with high elastic modulus for stiffness, the barrier layer uses oxygen/water barrier materials, and the wavelength conversion layer uses quantum dot materials. This composite approach enables the thin structure to maintain reliability through material property optimization.
2Length of stationary object
If the thickness of the wavelength conversion member is reduced, then the device becomes thinner, but the member becomes more susceptible to damage during handling and assembly
Solution Approach 1:
The wavelength conversion member is segmented into a support layer specifically designed for mechanical strength and a wavelength conversion layer for optical function. The support layer with high elastic modulus acts as a protective skeleton that absorbs mechanical stress during handling, preventing damage to the thinner wavelength conversion layer.
Solution Approach 2:
Different regions of the wavelength conversion member are assigned different material properties: the support layer has high elastic modulus and mechanical strength for structural integrity, while the wavelength conversion layer has optimized optical properties. This local quality differentiation allows the thin overall structure to maintain sufficient strength during handling.
3Length of stationary object
If the thickness of the wavelength conversion member is reduced, then the device profile is slimmer, but oxygen and water can more easily invade and damage the quantum dots
Solution Approach 1:
The wavelength conversion member is segmented to include a dedicated barrier layer positioned between the quantum dots and the external environment. This barrier layer acts as a protective shield that blocks oxygen and water vapor, preventing degradation of the quantum dots even in the thin overall structure.
Solution Approach 2:
The barrier layer serves as an intermediary protective layer between the quantum dots in the wavelength conversion layer and the external environment. This intermediate barrier prevents direct contact between oxygen/water and the quantum dots, solving the problem of harmful factor invasion in thin 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 suppresses non-light emission failure in thin wavelength conversion members by maintaining structural integrity and preventing damage to the barrier layer, ensuring reliable light emission.
Implementation Method 1
the wavelength conversion member has a barrier layer, wherein the wavelength conversion member has a total thickness of 120 μm or less
Implementation Method 2
quantum dots are excited by the incident light to emit fluorescence
Implementation Method 3
the wavelength conversion member has a rub resistance of 100 g or more, and the wavelength conversion member exhibits a bend resistance of a mandrel diameter of 4 mm or less
Data Source
AI summary
The wavelength conversion member includes a wavelength conversion layer containing quantum dots, in which the wavelength conversion layer is provided between two substrates, at least one of the two substrates has a barrier layer, the wavelength conversion member has a total thickness of 120 μm or less, the wavelength conversion member has a rub resistance of 100 g or more, and the wavelength conversion member exhibits a bend resistance of a mandrel diameter of 4 mm or less in a bend resistance test carried out according to a cylindrical mandrel method specified in JIS K 5600-5-1:1999.