Wavelength Conversion Member Sealing for Display Color Reproduction
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Solution Overview
Problem
Conventional display devices face challenges in achieving high color reproduction, reliability, and durability while maintaining cost-effectiveness, particularly in the design of backlight units for liquid crystal displays.
Innovation Solution
A display device incorporating a wavelength conversion member with a sealing layer protecting wavelength conversion particles, which are strategically spaced to reduce the number of particles needed and enhance light concentration on pixel regions, utilizing quantum dots to convert blue light into red and green light for improved color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wavelength conversion particles are densely distributed to improve color reproduction, then color reproduction is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The wavelength conversion layer is segmented into multiple sub-layers, each containing wavelength conversion particles of specific sizes or types. This segmentation allows for optimized color reproduction in each sub-layer while simplifying the overall manufacturing process by enabling modular fabrication and assembly of the multi-layer structure.
Solution Approach 2:
Different regions of the wavelength conversion layer are assigned different particle concentrations, sizes, or compositions tailored to local optical requirements. This local quality approach ensures optimal color conversion performance in each region while reducing overall material usage and manufacturing complexity compared to uniform distribution.
2Reliability
If a sealing layer is added to protect wavelength conversion particles from oxygen and moisture, then reliability and durability are improved, but device complexity increases
Solution Approach 1:
The sealing layer is designed to perform multiple functions simultaneously: it provides barrier protection against oxygen and moisture, serves as an adhesive bonding layer, and contributes to the mechanical strength of the structure. This multi-functionality reduces the need for separate protective components, thereby improving durability while minimizing increases in structural complexity.
Solution Approach 2:
The sealing and protective functions are merged into an integrated encapsulation structure that combines barrier layers, adhesive layers, and protective coatings into a unified multi-layer system. This merging approach simplifies the overall device architecture by eliminating the need for separate sealing components while providing comprehensive protection against environmental 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 achieves improved color reproduction, reliability, and durability by effectively sealing the wavelength conversion particles, reducing material usage, and concentrating converted light on pixel regions, thereby simplifying fabrication and enhancing display performance.
Implementation Method 1
a quantum dot bar having a plurality of quantum dots, which can convert blue light into red light or green light, is positioned in front of a blue LED that emits the blue light. Thus, as the blue light is irradiated onto the quantum dot bar, the blue light, the red light and the green light are mixed with each other by the quantum dots distributed in the quantum dot bar and the mixed light is incident into the light guide plate, so that white light is generated.
Data Source
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AI summary
The invention relates to an optical member (504) comprising a lower substrate (510), an upper substrate (520), a host (531) on the first substrate, a plurality of wavelength conversion particles (532) in the host (531); and a first inorganic protective layer under the lower substrate (510), wherein the first inorganic protective layer includes silicon oxide.