Mirror Display Warp Suppression Using Heat-Shrinkable Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional half mirror plates with a reflective polarizer bonded to only one side of a base material suffer from warping due to heat shrinkage, leading to distortion of the reflected image in mirror mode, especially in applications like outdoor digital signage where high temperatures prevail.
Innovation Solution
Incorporating a warp-suppressing member, such as a heat-shrinkable film or additional reflective polarizer, integrated with the reflective polarizer and base material to prevent shrinkage and maintain the flatness of the half mirror plate under heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a reflective polarizer is bonded to only one side of a base material to achieve a half mirror plate, then the device complexity is reduced and manufacturing is simplified, but the half mirror plate warps under heat causing distorted reflected images
Solution Approach 1:
The patent applies asymmetry by bonding the reflective polarizer to only one side of the base material, creating an asymmetric structure that simplifies manufacturing while the invention compensates for the resulting thermal warping through careful material selection and structural design
2Adaptability or versatility
If the reflective polarizer is heated under high temperature conditions, then the display device can operate in outdoor environments, but the reflective polarizer shrinks causing warp of the half mirror plate
Solution Approach 1:
The patent applies parameter changes by carefully selecting materials with specific thermal expansion coefficients and bonding characteristics that remain stable across a wide temperature range, allowing the half mirror plate to maintain its flatness from -30°C to +80°C without shrinking or warping
Solution Approach 2:
The patent uses a plastic base material with specific properties that can withstand thermal cycling without degrading, providing a cost-effective solution that maintains structural integrity in outdoor environments
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 effectively suppresses warp of the half mirror plate, preventing distortion of the reflected image by ensuring minimal heat-induced shrinkage, thereby enhancing the display quality in mirror mode.
Implementation Method 1
A reflective polarizer reflects, among incident light components, a polarized light component parallel to the reflection axis of the polarizer and transmits a polarized light component perpendicular to the reflection axis thereof
Implementation Method 2
a heat-shrinkable film or additional reflective polarizer, integrated with the reflective polarizer and base material to prevent shrinkage and maintain the flatness of the half mirror plate under heat
Data Source
AI summary
The present invention provides a mirror display that can suppress warp of a half mirror plate with a reflective polarizer under heat to prevent distortion of a reflected image in a mirror mode. The mirror display of the present invention includes a half mirror plate that includes a first reflective polarizer and a first base material, a display device, and a warp-suppressing member that suppresses shrinking of the first reflective polarizer under heat. The first reflective polarizer and the first base material are integrated, and the display device is disposed on the back surface side of the half mirror plate.