Polarizing Plate Slow Axis Angle Prevents Color Distortion
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Solution Overview
Problem
Polarizers used in display devices with PET protective films experience color distortion when viewed through polarized sunglasses, especially during outdoor activities, due to moisture exposure and the film's limited moisture barrier performance.
Innovation Solution
A polarizing plate configuration with a first and second protective film on either side of the polarizer, where the protective films have a slow axis angle between 0 to 4.5 degrees relative to the transverse direction axis, preventing color distortion and enhancing durability against moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PET protective film is used on the polarizer, then moisture barrier performance is improved, but color distortion occurs when viewed through polarized sunglasses
Solution Approach 1:
The patent changes the orientation parameter of the protective film by controlling the angle between the slow axis and the TD axis to be 0 to 4.5 degrees. This parameter adjustment eliminates the color distortion issue while preserving the moisture barrier performance of the PET film.
Solution Approach 2:
The patent introduces asymmetric orientation of the protective film relative to the polarizer's transverse direction axis. By setting a specific angular relationship (0 to 4.5 degrees) between the slow axis and TD axis, the asymmetric configuration prevents the harmful optical interference that occurs with conventional orientations.
2Duration of action of stationary object
If the protective film blocks moisture, then durability is improved, but the film structure causes color distortion under polarized observation
Solution Approach 1:
The patent modifies the orientation parameter of the protective film by controlling the angle between the slow axis and the TD axis to be 0 to 4.5 degrees. This parameter adjustment eliminates the color distortion issue while preserving the moisture barrier performance of the PET film.
Solution Approach 2:
The patent introduces asymmetric orientation of the protective film relative to the polarizer's transverse direction axis. By setting a specific angular relationship (0 to 4.5 degrees) between the slow axis and TD axis, the asymmetric configuration prevents the harmful optical interference that occurs with conventional orientations.
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 configuration effectively prevents color distortion and improves durability against external moisture, ensuring clear display device visibility even with polarized sunglasses, while maintaining excellent moisture barrier performance.
Implementation Method 1
a protective film for protecting the polarizer is used... the protective film of the polarizer also serves to block moisture
Implementation Method 2
The polarizer is a functional element capable of extracting light that vibrates in one direction from incident light that vibrates in various directions
Implementation Method 3
At least one protective film of the first protective film and the second protective film can have an angle in a range of 0 to 4.5 degrees as formed by the slow axis of the protective film with respect to the TD (transverse direction) axis
Data Source
AI summary
Provided is a polarizing plate and a display device. The polarizing plate has excellent durability against an external environment, for example, moisture, due to a protective film of a polarizer, and can prevent color distortion upon observation with polarized sunglasses, and a display device comprising the polarizing plate.