Polyimide Polarizer for Thin Display Panels
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Solution Overview
Problem
Existing liquid crystal display (LCD) polarizers are prone to warping due to heat and humidity, have poor durability, and fail to meet lightweight and thin device requirements due to excessive film layers and susceptibility to environmental conditions.
Innovation Solution
A display panel using organic film layers of polyimide doped with dichromatic organic dyes, which are aligned using polarized UV light, eliminating the need for protective and adhesive layers, thereby reducing thickness and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple protective films and adhesive layers are added to improve polarizer reliability, then the polarizer becomes more durable, but the display panel thickness increases and lightweight requirements cannot be met
Solution Approach 1:
The patent combines multiple functional layers (protective films, adhesive layers, and polarizing film) into a single integrated organic film layer made of polyimide doped with dichromatic organic dye. This merging eliminates the need for separate protective and adhesive layers, reducing overall thickness while maintaining reliability through the inherent properties of the polyimide material.
Solution Approach 2:
The organic film layer serves multiple functions simultaneously: it provides polarization functionality through dichromatic organic dye, acts as a protective layer due to polyimide's high temperature and humidity resistance, and eliminates the need for separate adhesive layers. This multi-functionality reduces the number of layers needed while maintaining all necessary properties.
2Ease of manufacture
If polyvinyl alcohol-based polarizing films are used to achieve polarization function, then the polarizer can be formed, but the film shrinks easily under heat and humidity causing warping
Solution Approach 1:
The patent changes the material parameters from polyvinyl alcohol to polyimide, which has fundamentally different thermal and humidity stability characteristics. Polyimide maintains its dimensional stability under high temperature and humidity conditions, preventing the shrinkage and warping issues that plague polyvinyl alcohol-based polarizing films.
Solution Approach 2:
The patent creates a composite material system by doping dichromatic organic dye into the polyimide matrix. This composite maintains the excellent thermal and humidity stability of polyimide while adding the polarization functionality of the organic dye, achieving both ease of manufacture and compositional stability.
3Ease of manufacture
If iodine molecules are used in the polarizing film to achieve polarization, then the polarizer can be formed, but the iodine molecules are destroyed in high temperature and high humidity environments reducing durability
Solution Approach 1:
The patent changes the chemical composition from iodine-doped polyvinyl alcohol to dichromatic organic dye-doped polyimide. This parameter change replaces the thermally labile iodine molecules with thermally stable organic dyes embedded in a heat-resistant polyimide matrix, eliminating degradation in high temperature and humidity environments.
Solution Approach 2:
The patent replaces the short-lived iodine molecules that degrade under thermal stress with long-lived dichromatic organic dye molecules that are chemically stable. This substitution ensures the polarizer maintains its functionality throughout the display panel's operational lifetime even in harsh environments.
4Ease of manufacture
If stretching process is used to align polyvinyl alcohol for polarization, then the polarizing function is achieved, but the process complexity increases and warping susceptibility increases
Solution Approach 1:
The patent replaces the mechanical stretching process with a chemical alignment mechanism. The dichromatic organic dye molecules naturally align along the polyimide chains during film formation and curing, achieving polarization without mechanical deformation. This substitution eliminates the complex stretching equipment and processes while preventing warping caused by mechanical stress.
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 achieves a reliable and durable polarizer with improved resistance to high temperature and humidity, reducing warping and thickness, while maintaining polarization functionality without stretching.
Implementation Method 1
exposing the first organic matter layer to polarized Ultraviolet (UV) light to form a first organic film layer of polyimide doped with a dichromatic organic dye
Implementation Method 2
Since both the polyimide and the dichromatic organic dye have a light alignment property, the function of polarizer can be achieved by the polyimide doped with the dichromatic organic dye after light alignment
Data Source
AI summary
A display panel and a manufacturing method therefor are disclosed. The display panel includes a first substrate, a second substrate disposed opposite to the first substrate, and at least one of a first organic film layer disposed on the first substrate, and a second organic film layer disposed on the second substrate, where at least one of the first organic film layer or the second organic film layer is an polyimide doped with a dichromatic organic dye.