Decorative Sheet with Circularly Polarized Light Reflection Layer
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Solution Overview
Problem
Decorative sheets with cholesteric liquid crystal layers exhibit significant tint changes when viewed from different directions, affecting the visibility of patterns, particularly when observed from oblique angles.
Innovation Solution
A decorative sheet comprising a circularly polarized light reflection layer with a decorative layer on top, featuring a pitch gradient structure and opening portions, which reduces tint changes and enhances pattern visibility from any direction by controlling the reflection and transmission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cholesteric liquid crystal layer is used for decoration, then pattern visibility is improved, but tint change depending on observation direction increases
Solution Approach 1:
The decorative sheet is divided into multiple functional layers: a circularly polarized light reflection layer that provides pattern visibility and a decorative layer that provides aesthetic appearance. This segmentation allows each layer to perform its specific function independently, with the circularly polarized light reflection layer maintaining consistent tint across observation directions while the decorative layer provides visual appeal.
Solution Approach 2:
The circularly polarized light reflection layer acts as an intermediary between the decorative layer and the external environment. It mediates the optical properties by reflecting circularly polarized light to maintain consistent tint appearance across different observation angles, while allowing the decorative layer to provide its aesthetic functions without causing tint variation.
2Stability of the object's composition
If a circularly polarized light reflection layer is added, then tint change is reduced, but device complexity increases
Solution Approach 1:
The circularly polarized light reflection layer serves multiple functions simultaneously: it maintains tint uniformity across observation directions, enhances pattern visibility, and can provide decorative effects. By making this layer multi-functional, the patent reduces the need for additional separate layers, thereby limiting the increase in overall device complexity despite adding the circularly polarized light reflection layer.
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 decorative sheet with minimal tint change and excellent pattern visibility from both front and oblique directions, improving the aesthetic and functional properties for applications like automobile interiors and display devices.
Implementation Method 1
The cholesteric liquid crystal layer is obtained by immobilizing a cholesteric liquid crystalline phase and is known as a layer having properties in which at least either right circularly polarized light or left circularly polarized light in a specific wavelength range is selectively reflected
Implementation Method 2
the circularly polarized light reflection layer exhibits selective reflection in a visible range
Data Source
AI summary
An object of the present invention is to provide: a decorative sheet having a small tint change depending on observation directions and having excellent visibility of a pattern in any observation direction during observation from a front direction and an oblique direction; and a display device and an automobile interior material including the decorative sheet. The decorative sheet according to the present invention includes: a circularly polarized light reflection layer; and a decorative layer that is disposed on the circularly polarized light reflection layer and where an opening portion is provided.