Transparent Heat-Shielding Member with Light Diffusing Layer
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Solution Overview
Problem
Current transparent heat-shielding/heat-insulating members fail to provide both excellent heat-shielding and heat-insulating properties while functioning as a transparent screen for digital signage, offering poor viewability from both sides and inadequate scratch resistance, with issues like iridescent phenomena and reduced brightness due to insufficient light scattering and refractive index variations.
Innovation Solution
A transparent heat-shielding/heat-insulating member is designed with an infrared reflective layer, an optical adjustment protective layer comprising high and low refractive index layers, and a light diffusing layer, optimizing the total thickness and refractive indices to achieve balanced reflectance, haze, and emissivity, ensuring excellent viewability, scratch resistance, and reduced color changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a transparent heat-shielding member is provided on a window pane to block heat rays, then heat-shielding properties are improved, but scratch resistance and appearance are insufficient
Solution Approach 1:
The patent applies composite materials by combining a transparent base substrate with multiple functional layers including a heat-shielding layer containing heat-ray absorbing or reflecting particles, and a protective layer with hard particles for scratch resistance. This composite structure integrates heat-shielding functionality with enhanced durability and scratch resistance, resolving the contradiction between heat-shielding properties and reliability.
Solution Approach 2:
The patent implements local quality by providing different functional layers at different positions: the heat-shielding layer is positioned to specifically address heat ray blocking, while the protective layer with hard particles is positioned on the surface to specifically provide scratch resistance. Each layer performs its localized function optimally, allowing the overall structure to achieve both heat-shielding and durability requirements.
2Temperature
If a transparent heat-shielding/heat-insulating member is used to provide heat shielding and insulation, then thermal control is improved, but transparent screen function for digital signage is insufficient
Solution Approach 1:
The patent achieves multi-functionality by integrating three key functions into a single transparent member: heat-shielding (via heat-ray absorbing particles), heat-insulation (via far-infrared reflecting particles), and transparent screen function for digital signage (via light scattering particles and appropriate transparency design). This allows the same member to serve multiple purposes including thermal control and display functionality, resolving the contradiction between thermal control and adaptability.
Solution Approach 2:
The patent merges previously separate functions into a single integrated transparent member. Instead of using separate heat-shielding films and separate projection screens, the invention combines heat-ray absorbing particles, far-infrared reflecting particles, and light scattering particles within one transparent structure, enabling simultaneous thermal management and digital signage capabilities.
3Loss of energy
If the thickness of the hardcoat layer is reduced to suppress absorption of infrared rays, then heat-insulating function is improved, but scratch resistance deteriorates
Solution Approach 1:
The patent extracts the scratch resistance function from the hardcoat layer and places it into a separate protective layer containing hard particles. This allows the hardcoat layer to be optimized for its primary function of providing scratch resistance without being constrained by thickness requirements for heat insulation, while the protective layer independently provides enhanced scratch resistance through embedded hard particles.
Solution Approach 2:
The patent applies local quality by positioning different functional particles in different layers: heat-ray absorbing particles and far-infrared reflecting particles are positioned in the heat-shielding layer to optimize thermal properties, while hard particles are positioned in the protective layer to specifically address scratch resistance. This localized functional distribution allows each layer to be optimized for its specific purpose without compromise.
4Adaptability or versatility
If a transparent screen is attached to a window to enable digital signage, then display functionality is improved, but viewability from both sides and background transparency are insufficient
Solution Approach 1:
The patent applies parameter changes by carefully controlling the concentration, size distribution, and refractive index of light scattering particles to optimize the balance between display functionality and viewability. By adjusting these parameters, the transparent member achieves sufficient light scattering for projection display while maintaining adequate light transmission for background visibility and two-sided viewability, resolving the contradiction between display functionality and illumination quality.
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 transparent screen with enhanced heat-shielding, heat-insulating properties, improved viewability from both sides, and excellent scratch resistance, maintaining clarity and brightness while minimizing iridescent effects and refractive index variations.
Implementation Method 1
infrared reflective layer which includes a metal layer and a metal oxide layer and/or a metal nitride layer
Implementation Method 2
a light diffusing layer on a surface of the transparent base substrate that is opposite to the surface on which the infrared reflective layer is formed or between the transparent base substrate and the infrared reflective layer
Implementation Method 3
the optical adjustment protective layer includes at least a high refractive index layer and a low refractive index layer in this order from the infrared reflective layer side
Data Source
AI summary
A transparent heat-shielding/heat-insulating member having a transparent screen function of the present invention includes: an infrared reflective layer and an optical adjustment protective layer in this order from a transparent base substrate side; and a light diffusing layer on a surface of the transparent base substrate that is opposite to the surface on which the infrared reflective layer is formed or between the transparent base substrate and the infrared reflective layer. The optical adjustment protective layer includes at least a high refractive index layer and a low refractive index layer in this order from the infrared reflective layer side. The transparent heat-shielding/heat-insulating member has a visible light reflectance of 12% or more and 30% or less, a haze value of 5% or more and 35% or less, a shading coefficient of 0.69 or less, and a normal emissivity of 0.22 or less.