Polarizing Device Auxiliary Layer Thermal Stress
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Solution Overview
Problem
Polarizers in liquid crystal displays bend due to internal stress caused by water absorption and temperature changes in harsh environments, leading to substrate separation and reliability issues.
Innovation Solution
A polarizing device with an auxiliary functional layer containing a host material and an additive with a lower thermal expansion coefficient and higher thermal conductivity, such as silicon dioxide or modified zinc sulfide microspheres, is used to reduce thermal expansion and enhance conductivity, preventing bending under stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the polarizing device uses conventional materials without additives, then the manufacturing cost is lower and the structure is simpler, but the device bends due to stress in harsh environments such as high temperature and high humidity
Solution Approach 1:
The patent applies composite materials by incorporating additives (such as silicon dioxide microspheres, zinc sulfide microspheres, or modified zinc sulfide microspheres) into the auxiliary functional layer of the polarizing device. This composite structure combines the host material with particulate additives that have lower thermal expansion coefficients and higher thermal conductivity, enabling the layer to resist thermal stress and prevent bending while maintaining structural integrity in harsh environments.
Solution Approach 2:
The patent changes the physical parameters of the auxiliary functional layer by selecting additives with specific properties: thermal expansion coefficient less than 5×10^-6/K and thermal conductivity greater than 1 W/(m·K). These parameter modifications enable the material to better withstand thermal stress without bending, directly addressing the reliability issue in high temperature and humidity conditions.
2Temperature
If the auxiliary functional layer uses materials with high thermal expansion coefficient, then the material selection is easier and manufacturing is simpler, but the layer bends due to thermal stress in high temperature environments
Solution Approach 1:
The patent specifies precise parameter ranges for the additive materials: thermal expansion coefficient less than 5×10^-6/K and thermal conductivity greater than 1 W/(m·K). By changing these material parameters, the auxiliary functional layer can withstand thermal stress in high temperature environments without bending, while the use of microspheres (10 nm to 5 μm diameter) maintains ease of incorporation into the host material.
3Use of energy by stationary object
If the polarizing device uses low thermal conductivity materials, then the material selection is broader and manufacturing is easier, but the device cannot effectively dissipate heat in harsh environments
Solution Approach 1:
The patent creates a composite auxiliary functional layer by dispersing thermally conductive additives (silicon dioxide microspheres, zinc sulfide microspheres, or modified zinc sulfide microspheres) within a host material matrix. This composite structure enhances the overall thermal conductivity of the layer, enabling effective heat dissipation in harsh environments while maintaining a relatively simple single-layer structure that does not significantly increase manufacturing complexity.
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 improves the reliability of polarizing devices by reducing thermal expansion and enhancing conductivity, thereby maintaining stability in high temperature and high humidity environments without the need for conventional thickening methods, which reduces manufacturing costs.
Implementation Method 1
a thermal expansion coefficient of the additive is less than a thermal expansion coefficient of the host material
Implementation Method 2
a thermal conductivity of the additive is greater than a thermal conductivity of the host material
Data Source
AI summary
The present invention discloses a polarizing device, a preparation method thereof, a display panel, and a display device. The polarizing device includes: a polarizing functional layer; and an auxiliary functional layer disposed on the polarizing functional layer, wherein the auxiliary functional layer includes a host material and an additive, a thermal expansion coefficient of the additive is less than that of the host material, and a thermal conductivity of the additive is greater than that of the host material. In the above way, the present invention can improve stress bending of the polarizing device in a severe environment such as high temperature and high humidity, and improve quality and reliability of product.