Decorative Film with Angle-Dependent Optical Properties
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Solution Overview
Problem
Existing decorative films fail to provide a visual effect where a pattern is not recognizable when viewed from the front but becomes visible when viewed obliquely, particularly in vehicle dashboards with colors other than black or multicolor patterns, leading to issues with reflected glare on window screens.
Innovation Solution
A decorative film comprising a circular polarization plate with a linear polarization plate, a laminate of uniaxial or biaxial retardation layers, and a circularly polarized light reflection layer that reflects light with an opposite revolution direction, allowing the pattern to be invisible frontally and visible obliquely by utilizing a cholesteric liquid crystalline layer with selective reflection wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a dashboard is set to a color other than black or has a multicolor pattern to improve design, then aesthetic appearance is improved, but reflected glare on the window screen increases blocking the driver's view
Solution Approach 1:
The patent applies a decorative film with angle-dependent optical properties that changes its visual appearance based on viewing angle. When viewed from the front, the film appears uniform and non-patterned, but when viewed obliquely, it displays a multicolor pattern. This allows the dashboard to have aesthetic patterns while preventing front-view glare on the window screen.
Solution Approach 2:
The patent introduces angular dimension to the optical properties of the dashboard surface. By making the visual appearance angle-dependent, the film creates different optical states for different viewing directions, allowing patterns to be visible only from oblique angles while maintaining a uniform appearance from the front, thus resolving the glare issue.
2Loss of information
If a decorative film makes patterns visible from all angles to improve visibility, then pattern recognition is improved, but reflected glare on the window screen increases
Solution Approach 1:
The patent applies different optical properties to different viewing angles. The film is designed to have uniform appearance properties for front-viewing directions (reducing glare) while displaying pattern properties for oblique viewing directions (maintaining visibility). This local differentiation of optical quality resolves the contradiction between glare prevention and pattern visibility.
3Object-affected harmful factors
If a dashboard is set to black to prevent reflected glare on the window screen, then glare is reduced, but design freedom is limited
Solution Approach 1:
The patent makes the optical properties of the dashboard dynamic and adjustable based on viewing conditions. The decorative film automatically adapts its appearance characteristics according to the viewing angle, providing glare-free uniform appearance from the front while enabling pattern display from oblique angles. This dynamic adaptation restores design freedom without sacrificing glare prevention.
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 film effectively prevents reflected glare while enhancing design by making patterns visible only when viewed from an angle, improving visibility and reducing glare issues.
Implementation Method 1
a linear polarization plate
Implementation Method 2
a circularly polarized light reflection layer which reflects circularly polarized light having a revolution direction opposite to that of light transmitted through the circular polarization plate in a vertical direction
Implementation Method 3
a laminate of a uniaxial retardation layer or a biaxial retardation layer
Data Source
AI summary
To provide a decorative film capable of applying a visual effect of making a pattern not visually recognizable, in a case where it is seen from the front, and making it visually recognizable, in a case where it is obliquely seen.a circular polarization plate including a linear polarization plate, and a laminate of a uniaxial retardation layer or a biaxial retardation layer; and a circularly polarized light reflection layer which reflects circularly polarized light having a revolution direction opposite to that of light transmitted through the circular polarization plate in a vertical direction from the linear polarization plate side are included.