Thermal Transfer Film with Gradient Light-to-Heat Conversion Layer
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Solution Overview
Problem
Thermal transfer films with light-to-heat conversion layers suffer from low surface roughness and reflection spots due to poor dispersibility of light-to-heat conversion materials, leading to transfer failures and productivity issues, especially when a multilayer structure is required for uniformity.
Innovation Solution
A thermal transfer film with a base layer and a light-to-heat conversion layer comprising a first layer with higher concentration of light-to-heat conversion material and a second layer with lower concentration, formed in a single layer structure to enhance surface roughness and adhesion, minimizing reflection spots and maintaining high thermal transfer performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light-to-heat conversion layer is formed by curing a composition including light-to-heat conversion material in particle form, then the layer can be formed, but the surface roughness becomes low due to bad dispersibility
Solution Approach 1:
The light-to-heat conversion layer is divided into two distinct layers: a first layer with high light-to-heat conversion material concentration and a second layer with low concentration. This segmentation allows the first layer to provide sufficient heat conversion while the second layer maintains smooth surface finish, resolving the contradiction between surface roughness and material dispersibility.
Solution Approach 2:
Different regions of the light-to-heat conversion layer are assigned different material concentrations. The first layer (near the transfer material) has high concentration for effective thermal transfer, while the second layer (outer layer) has low concentration for smooth surface appearance and no reflection spots, achieving local optimization of both properties.
2Reliability
If an interlayer is additionally stacked on the light-to-heat conversion layer to prevent transfer failure, then transfer reliability improves, but productivity decreases due to multilayer structure and reflection spots
Solution Approach 1:
The patent merges the functions of the light-to-heat conversion layer and the interlayer into a single integrated light-to-heat conversion layer with spatially varying concentration. This eliminates the need for a separate interlayer, maintaining transfer reliability while simplifying the structure to improve productivity and eliminate reflection spots.
Solution Approach 2:
The light-to-heat conversion layer is designed to perform multiple functions simultaneously: the first layer provides thermal conversion for reliable transfer, while the second layer provides smooth surface finish for appearance quality. This multi-functionality eliminates the need for separate specialized layers.
3Device complexity
If light-to-heat conversion material is uniformly distributed in the light-to-heat conversion layer, then the layer structure is simple, but surface roughness deteriorates due to particle aggregation
Solution Approach 1:
Instead of uniform distribution, the light-to-heat conversion material is non-uniformly distributed with high concentration in the first layer and low concentration in the second layer. This local quality variation ensures sufficient thermal conversion where needed while maintaining smooth surface appearance where visible.
Solution Approach 2:
The patent transitions from a two-dimensional uniform distribution problem to a three-dimensional concentration gradient solution. By controlling material distribution through the thickness direction (first layer vs. second layer), the patent achieves both adequate thermal performance and smooth surface finish without increasing lateral 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 provides a thermal transfer film with improved surface roughness, adhesion, and productivity, ensuring uniform transfer and external appearance without reflection spots, even in a single light-to-heat conversion layer form.
Implementation Method 1
a light-to-heat conversion layer including a light-to-heat conversion material, which absorbs radiant light of a desired wavelength and converts at least portion of incident light into heat
Data Source
AI summary
The present invention relates to a thermal transfer film comprising: a base layer; and a light-to-heat conversion layer which is laminated on top of the base layer and includes a first layer laminated on top of the base layer and a second layer laminated on top of the first layer in the thickness direction, wherein light-to-heat conversion materials are more omnipresent in the first layer than the second layer. The present invention also relates to an organic electroluminescent device prepared using said film.