Polarizing Member with Third Retarder for Sunglass Visibility
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Solution Overview
Problem
Existing display devices face challenges in reducing external light reflection and improving visibility, especially for users wearing polarized sunglasses.
Innovation Solution
A polarizing member is designed with a polarizer, multiple retarders, and protective films to reduce external light reflection and enhance visibility. The polarizing member includes a polarizer with intersecting absorption and transmission axes, a first retarder under the polarizer, a second retarder under the first retarder, and a third retarder on the polarizer. The third retarder has an in-plane retardation value ranging from 37.5 nm to 237.5 nm and an angle between its retardation axis and the polarizer's transmission axis between 15° and 75°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional polarizing member is used, then external light reflection is reduced to some extent, but visibility for users wearing polarized sunglasses deteriorates
Solution Approach 1:
The polarizing member is divided into multiple functional layers: a polarizer layer for basic polarization, a first retarder layer for controlling reflected light, and a second retarder layer specifically for optimizing visibility with polarized sunglasses. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between reducing reflection and maintaining visibility for sunglasses users.
Solution Approach 2:
The patent employs retarders with specific retardation values (first retarder: λ/2, second retarder: λ/4) and precise angle orientations relative to the polarizer's transmission axis. By carefully controlling these optical parameters, the system reduces external light reflection while simultaneously improving visibility for users wearing polarized sunglasses.
2Ease of operation
If multiple retarders are added to improve visibility, then the device complexity increases
Solution Approach 1:
The optical system is segmented into distinct functional layers with specific purposes: the polarizer provides basic polarization, the first retarder (λ/2) controls reflected light characteristics, and the second retarder (λ/4) optimizes visibility. This clear functional segmentation achieves improved visibility while keeping the structure organized and manageable, mitigating the complexity increase.
Solution Approach 2:
Each retarder layer is designed with specific retardation values and orientation angles that are optimized for their particular function. The first retarder uses λ/2 retardation at a specific angle to control reflection, while the second retarder uses λ/4 retardation at a different angle to enhance visibility. These precise parameter specifications allow the complex multi-layer structure to perform efficiently despite the increased number of components.
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 polarizing member effectively reduces external light reflection, improves visibility for users wearing polarized sunglasses, and enhances the reliability of the display device by preventing cracks in the third retarder during reliability evaluations.
Implementation Method 1
a polarizer including an absorption axis and a transmission axis that intersect each other
Implementation Method 2
a first retarder disposed under the polarizer, a second retarder disposed under the first retarder; and a third retarder disposed on the polarizer
Data Source
AI summary
A polarizing member includes a polarizer including an absorption axis and a transmission axis that intersect each other, a first retarder disposed under the polarizer, a second retarder disposed under the first retarder; and a third retarder disposed on the polarizer, where an in-plane retardation value of the third retarder ranges from approximately 37.5 nanometers (nm) to approximately 237.5 nm, and where an angle between a retardation axis of the third retarder and the transmission axis of the polarizer ranges from approximately 15 degrees (°) to approximately 75°.