Polarizing Plate With UV-Blocking Adhesive Layer
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Solution Overview
Problem
Polarizing plates for organic light emitting displays face challenges in preventing damage from external impacts, thermal deformation, and UV-induced discoloration, which affect the lifespan and reliability of the organic light emitting diode panels.
Innovation Solution
A polarizing plate design featuring a polarizing film, a first adhesive layer with a UV absorber, a first optical compensation layer, a second adhesive layer, and a second optical compensation layer, stacked in order, with an elastic modulus of 100 MPa to 1,000 MPa, which provides excellent adhesion and UV blocking capabilities, reducing thermal deformation and external impact damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cover glass is stacked on the organic light emitting diode to prevent damage from external impact, then the organic light emitting diode is protected from damage, but the thickness of the display increases
Solution Approach 1:
The patent combines the protective function with the existing polarizing plate structure by integrating a protective film and UV blocking layer into the polarizing plate itself, rather than adding a separate cover glass. This merging of functions maintains impact protection while avoiding increased display thickness.
Solution Approach 2:
The polarizing plate is designed to perform multiple functions simultaneously: polarization, UV blocking, and impact protection. By making the polarizing plate multi-functional, the patent eliminates the need for a separate cover glass, thus protecting the OLED without increasing overall thickness.
2Illumination intensity
If two or more optical compensation layers are attached to each other via an adhesive layer, then visibility is improved and external light reflection is prevented, but thermal deformation occurs causing deterioration in moist-heat and heat resistance
Solution Approach 1:
The patent modifies the adhesive layer composition to include specific resin components with appropriate glass transition temperatures and crosslinking agents. By changing the chemical parameters of the adhesive layer, it achieves both good adhesion between optical compensation layers and resistance to thermal deformation under moist-heat and heat conditions.
Solution Approach 2:
The adhesive layer is designed as a composite material system comprising specific resins and crosslinking agents that work together to provide both adhesion and thermal stability. This composite structure allows the adhesive layer to maintain bond strength while resisting thermal deformation.
3Duration of action of stationary object
If the polarizing plate blocks UV light at wavelengths of 420 nm or less, then discoloration is prevented and lifespan is extended, but the adhesive layer must maintain both UV blocking and adhesion properties
Solution Approach 1:
The patent combines UV blocking functionality with adhesion properties in a single adhesive layer by incorporating UV absorbers into the adhesive composition. This merging eliminates the need for separate UV blocking layers while maintaining both protection and bonding functions.
Solution Approach 2:
The adhesive layer is designed to perform multiple functions: providing adhesion between layers, blocking UV light to prevent discoloration, and maintaining structural integrity. This multi-functional design simplifies the overall structure while extending the lifespan of the OLED.
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 plate effectively suppresses damage from external impacts and UV-induced discoloration, enhancing the reliability and lifespan of organic light emitting diode panels by maintaining adhesion and blocking UV light at wavelengths of 420 nm or less without the need for additional cover glasses, thus reducing display thickness.
Implementation Method 1
a first adhesive layer with a UV absorber
Implementation Method 2
blocking UV light at wavelengths of 420 nm or less
Data Source
AI summary
Provided are a polarizing plate and an optical display device comprising the same, wherein the polarizing plate has a polarizing film, a first adhesive layer, a first optical compensation layer, a second adhesive layer, and a second optical compensation layer laminated successively, and elastic modulus measured by a microindenter at 25° C. on the surface of the second optical compensation layer with regard to the polarizing plate is about 100 MPa to about 1000 MPa.