Polarizing Plate UV-Curable Bonding Light Shielding Layer
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Solution Overview
Problem
Polarizer protective films with thermosetting light shielding layers suffer from cracking and yellowing when bonded to polarizers using UV-curable bonding agents, leading to reduced light shielding efficacy and color stability over time.
Innovation Solution
A polarizing plate design incorporating a UV-curable bonding layer with a thermosetting light shielding layer containing a UV absorbent, which absorbs UV light and minimizes cracking, and a UV stabilizer to maintain color and light shielding properties even after prolonged UV exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a thermosetting light shielding layer is bonded to a polarizer using a UV-curable bonding agent through UV irradiation, then bonding speed is improved, but the light shielding layer suffers from cracking and yellowing
Solution Approach 1:
A UV filter layer is introduced as an intermediary between the UV-curable bonding agent and the thermosetting light shielding layer. This filter layer selectively blocks UV radiation, preventing degradation of the light shielding layer while allowing controlled UV exposure for bonding. The intermediary layer resolves the contradiction by enabling the bonding process without transmitting harmful UV energy to the light shielding layer.
Solution Approach 2:
The solution applies different UV transmission properties to different regions: the UV filter layer allows UV penetration in bonding areas while blocking UV in areas adjacent to the light shielding layer. This localized quality control enables selective UV exposure, maintaining bonding efficacy while protecting the light shielding layer from cracking and yellowing.
2Duration of action of moving object
If UV irradiation is applied for prolonged periods to ensure complete curing, then curing completeness is improved, but color value variations and light shielding variations increase
Solution Approach 1:
The UV filter layer acts as a mediator that controls UV radiation exposure. It allows sufficient UV energy to pass through for complete curing of the bonding agent while blocking excessive UV that would cause color value variations and light shielding variations in the light shielding layer over time.
Solution Approach 2:
The UV filter layer modifies the UV radiation parameter by selectively absorbing or blocking specific UV wavelengths. This parameter change enables controlled UV exposure that achieves complete curing without causing degradation, maintaining color and light shielding stability even after prolonged exposure.
3Volume of moving object
If the light shielding layer is made thinner to achieve slimness, then display slimness is improved, but light shielding efficacy decreases
Solution Approach 1:
The solution employs a composite structure combining a thin light shielding layer with a UV filter layer and UV-curable bonding agent. This composite material system achieves effective light shielding with reduced thickness by utilizing the synergistic effects of multiple layers, where the UV filter protects the light shielding layer's integrity and the bonding agent provides structural support.
Solution Approach 2:
The UV filter layer is strategically positioned adjacent to the light shielding layer, creating a localized protection zone. This local quality enhancement allows the light shielding layer to be thinner while maintaining efficacy, as the UV filter compensates for the reduced thickness by preventing degradation and maintaining structural integrity.
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 effectively prevents cracking and maintains high light shielding efficacy, hardness, impact resistance, and scratch resistance while reducing color and light shielding variations, ensuring reliable performance over time.
Implementation Method 1
the light shielding layer is on at least one surface of the first polarizer protective film and includes a UV absorbent (material)
Implementation Method 2
A bonding layer and a first polarizer protective film sequentially stacked on an upper surface of the polarizer... formed of a UV curable bonding agent
Data Source
AI summary
A polarizing plate and an optical display including the same are provided. The polarizing plate is composed of a display region and a non-display region surrounding the display region, and includes: a polarizer; and a bonding layer and a first polarizer protective film sequentially stacked on an upper surface of the polarizer. A light shielding layer includes a UV absorbent material and is embedded in the bonding layer to constitute at least a portion of the non-display region. The light shielding layer is formed on at least one surface of the first polarizer protective film.