Substrate-less Window Deco Film for Thin Displays
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Solution Overview
Problem
Conventional window deco films with PET base films result in excessive thickness, phase differences, and bubble generation when attached to curved substrates, leading to mura issues in image display devices.
Innovation Solution
A substrate-less window deco film with a hard coating layer, deco layer, light-shielding layer, and acryl-based coating layer, where the hard coating layer serves as the base, reducing thickness and preventing bubble formation, and the acryl-based coating layer enhances durability and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a PET base film is used in the deco film, then the deco film has sufficient strength and structural stability, but the thickness of the deco film is excessively increased
Solution Approach 1:
The invention extracts and removes the PET base film from the traditional deco film structure. The patent applies for a deco film that consists only of functional layers (deco pattern layer, light-shielding layer, hard coating layer, and adhesive layer) without requiring a separate base film, thereby eliminating the thickness contribution of the PET substrate while maintaining necessary structural integrity through the functional layers themselves
Solution Approach 2:
The invention makes the adhesive layer serve multiple functions: it provides adhesion between layers, replaces the need for a separate base film by forming the bottommost structural layer, and contributes to the overall mechanical strength of the deco film assembly. This multi-functionality allows the elimination of the PET base film while maintaining sufficient strength
2Stability of the object's composition
If a PET base film is used in the deco film, then the deco film has structural stability, but phase difference occurs causing mura in display panels
Solution Approach 1:
The invention extracts the PET base film which is the source of phase difference and mura problems. By removing this birefringent material, the patent eliminates the optical interference that causes mura while maintaining structural stability through the alternative layer configuration consisting of inorganic light-shielding layers and organic functional layers with controlled optical properties
Solution Approach 2:
The invention changes the material parameters of the deco film structure by replacing PET (an organic polymer with inherent birefringence) with an inorganic light-shielding layer and thin organic functional layers. This parameter change in material composition eliminates the phase difference effect while maintaining the necessary structural stability through the multi-layer design
3Area of stationary object
If a conventional deco film is attached to a curved window substrate, then the deco film covers the substrate, but bubbles are generated at curved portions
Solution Approach 1:
The invention employs thin film structures for the deco film layers, particularly the adhesive layer and functional layers, which can flex and conform to curved surfaces. This thin-film design allows the deco film to adapt to the curvature of the window substrate without generating bubbles, as the flexible structure can accommodate the geometric changes without trapping air
4Length of stationary object
If the deco film thickness is reduced by removing the base film, then the overall device thickness is decreased, but the strength and durability of the deco film may be compromised
Solution Approach 1:
The invention uses composite material structure consisting of inorganic light-shielding layers and organic functional layers (deco pattern layer, hard coating layer, adhesive layer). This composite design provides both the necessary strength and durability while maintaining reduced thickness, as each layer contributes specific mechanical properties that collectively replace the function of the thicker PET base film
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 results in a thinner, lighter window deco film that suppresses mura and bubble generation on curved substrates, improving transmittance and durability while maintaining enhanced aesthetic and decorative effects.
Implementation Method 1
a hard coating layer
Implementation Method 2
an acryl-based coating layer
Data Source
AI summary
A window deco film includes a hard coating layer, and a deco layer, a light-shielding layer and an acryl-based coating layer formed on the hard coating layer. The window deco film may have a remarkably reduced thickness, and thus an entire thickness of an image display device including a window substrate to which the window deco film is applied may be also reduced. Additionally, even when the window deco film is attached to a curved window substrate, a bubble may not be generated at a curved portion of the window substrate. A mura caused by a retardation or a phase difference due to the window deco film may be suppressed. Thus, the window deco film may have an improved transmittance.