Light-emitting display device, and a light-blocking layer-equipped fiber sheet for use in light-emitting display device
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Solution Overview
Problem
Conventional methods for forming a light-blocking layer on fiber sheets for light-emitting display devices result in uneven ink absorption, making it difficult to achieve a high light-blocking effect with minimal coating unevenness.
Innovation Solution
A light-blocking layer-equipped fiber sheet is formed with an arithmetic mean height of 3 to 20 μm and an apparent density of 0.5 g/cm3, allowing for a high light-blocking effect and minimal coating unevenness through printing, with the option of a napped surface and a light-transmissive surface resin layer for luxurious finishes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light-blocking layer is printed on a conventional fiber sheet, then the light-blocking region can be formed, but uneven ink absorption occurs resulting in coating unevenness and reduced light-blocking effect
Solution Approach 1:
The patent applies parameter changes by controlling the arithmetic mean height of the fiber sheet surface within a specific range (3 to 20 μm) and setting the apparent density to 0.5 g/cm³ or more. These parameter optimizations enable uniform ink absorption during printing, achieving a light-blocking layer with minimal coating unevenness while maintaining manufacturing simplicity.
2Manufacturing precision
If the fiber sheet surface is made smoother for better printing, then coating uniformity improves, but the light-blocking effect may be reduced due to decreased light scattering
Solution Approach 1:
The patent identifies an optimal parameter range for the arithmetic mean height (3 to 20 μm) that balances two competing requirements: smooth enough surface for uniform printing while maintaining sufficient light scattering capability. This parameter optimization resolves the contradiction between coating uniformity and light-blocking effect.
Solution Approach 2:
The patent uses a composite structure combining fiber sheets with specific surface properties and apparent density (0.5 g/cm³ or more) to achieve both uniform ink absorption and effective light blocking. The composite approach allows the material to simultaneously provide printing suitability and optical performance.
3Object-affected harmful factors
If the apparent density of the fiber sheet is increased to improve light blocking, then light-blocking effect improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent sets the apparent density to 0.5 g/cm³ or more as an optimal parameter that achieves effective light blocking without requiring complex fiber sheet structures. This parameter specification enables light-blocking performance while maintaining manufacturing simplicity and avoiding excessive structural complexity.
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 enables a fiber sheet with a high light-blocking effect and minimal coating unevenness, effectively concealing the light-emitting member when off and displaying symbols or images via light emission when on, while providing luxurious finishes.
Implementation Method 1
a light-blocking layer that is formed by being partially printed on at least one surface of the fiber sheet
Implementation Method 2
a light-transmissive sheet, and the presence of the light-emitting member is made less visible while the light-emitting member is turned off, and a symbol such as a character and an icon, a pattern, and/or an image is allowed to emerge on the surface while a light emitter of the light-emitting member is turned on
Data Source
AI summary
A light-emitting display device includes: a light-emitting member; and a light-blocking layer-equipped fiber sheet that covers a light-emitting surface of the light-emitting member. The light-blocking layer-equipped fiber sheet includes a fiber sheet, and a light-blocking layer that is partially printed on at least one surface of the fiber sheet. The surface of the fiber sheet on which the light-blocking layer is formed has an arithmetic mean height Sa of 3 to 20 μm, as measured based on ISO 25178, and the fiber sheet has an apparent density of 0.5 g/cm3 or more.