Light Shielding Member with Polarizing Plates and Phase-Change Polymer
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Solution Overview
Problem
Existing light shielding members lack the ability to control light transmission and non-transmission based on temperature changes effectively, and they do not achieve high transmittance at specific temperatures.
Innovation Solution
A light shielding member comprising a first and second polarizing plate with differing transmission axes and a thermosensitive sheet containing a side chain crystal polymer that crystallizes below its melting point and becomes fluid above it, allowing reversible control of light transmission based on temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light shielding members are used, then light transmission control is achieved, but high transmittance cannot be obtained
Solution Approach 1:
The invention uses a composite structure consisting of polarizing plates combined with a thermosensitive sheet containing side chain crystal polymer. This composite material approach enables both high light transmittance in the transparent state and reliable temperature-dependent control, as the polarizing plates provide optical control while the thermosensitive polymer provides temperature-responsive phase transition behavior.
Solution Approach 2:
The side chain crystal polymer undergoes reversible phase transition between crystalline and liquid states at a specific melting point temperature. Below the melting point, the polymer is crystallized and transparent to light; above the melting point, it becomes fluid and blocks light transmission. This phase transition mechanism enables reliable temperature-dependent light control while achieving high transmittance in the transparent state.
2Adaptability or versatility
If temperature control of light transmission is implemented, then optical switching is achieved, but manufacturing complexity increases
Solution Approach 1:
The invention merges the polarizing plates and thermosensitive sheet into a single integrated light shielding member structure. The thermosensitive sheet is positioned between the polarizing plates, creating a unified component that performs both optical control and temperature response functions simultaneously, simplifying the manufacturing and assembly process.
Solution Approach 2:
The thermosensitive sheet serves multiple functions: it acts as the temperature-responsive element, provides structural support between the polarizing plates, and enables both transparent and opaque states through phase transition. This multi-functionality reduces the number of separate components needed, thereby simplifying manufacturing.
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 member can switch between transparent and opaque states at different temperatures, achieving high transmittance below the melting point and blocking light above it, with improved optical characteristics and ease of assembly.
Implementation Method 1
the thermosensitive sheet contains a side chain crystal polymer which is crystallized at a temperature lower than the melting point
Implementation Method 2
exhibiting fluidity at a temperature of the melting point or higher
Implementation Method 3
the first polarizing plate and the second polarizing plate are positioned so that their respective transmission axes are different from each other
Data Source
AI summary
A light shielding member of the present invention may include a first polarizing plate, a second polarizing plate facing the first polarizing plate, and a thermosensitive sheet interposed between the first polarizing plate and the second polarizing plate, in which the first polarizing plate and the second polarizing plate may be positioned so that their respective transmission axes are different from each other. The thermosensitive sheet may include a side chain crystal polymer that crystallizes at a temperature lower than the melting point and exhibits fluidity at a temperature of the melting point or higher where the side chain crystal polymer is oriented in one direction.