Optical Unit with UV Absorbent for Foldable Display Anti-Reflection
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Solution Overview
Problem
Foldable display devices face issues with external light reflection and scattering, particularly when used outdoors, and require thinner anti-reflection films to accommodate their flexible design, which affects display quality and thickness.
Innovation Solution
An optical unit comprising a phase difference layer with a UV absorbent and a linear polarization layer, which includes a base film, liquid crystal layer, and overcoat layer, is integrated into the display to minimize external light reflection and enhance flexibility, using compounds like benzotriazole-based UV absorbents to control UV light impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional anti-reflection film is used, then external light reflection is reduced, but the thickness increases and flexibility decreases
Solution Approach 1:
The patent combines multiple functions into a single integrated optical unit: the phase difference layer (with UV absorbent and liquid crystal) and the linear polarization layer are merged into one structure. This integration achieves anti-reflection, UV protection, and polarization functions simultaneously while reducing total thickness compared to separate layers.
Solution Approach 2:
The optical unit serves multiple purposes: it acts as an anti-reflection film, a UV protective layer, and a polarization filter all in one component. The phase difference layer with UV absorbent provides both UV protection and phase difference functionality, while the linear polarization layer adds polarization capability, creating a multi-functional element that replaces several separate components.
2Adaptability or versatility
If the anti-reflection film is made thinner to improve flexibility, then flexibility improves, but the ability to minimize external light reflection deteriorates
Solution Approach 1:
The patent changes the optical parameters of the thin film by introducing a phase difference layer with specific retardation characteristics (λ/4 or λ/2) and UV absorbent concentration. This allows a thin film structure to achieve enhanced anti-reflection performance through optical parameter optimization rather than relying solely on increased thickness.
Solution Approach 2:
The optical unit uses composite material structures: the phase difference layer combines UV absorbent compounds with liquid crystal materials, and the linear polarization layer uses polarizing films with specific molecular orientations. These composite structures provide enhanced functionality in a thin configuration, achieving both flexibility and effective light reflection minimization.
3Object-affected harmful factors
If UV absorbent is added to protect against UV light, then UV protection improves, but the complexity of the optical unit increases
Solution Approach 1:
The UV absorbent is merged into the existing phase difference layer structure rather than being added as a separate layer. The phase difference layer already contains liquid crystal materials and alignment layers; incorporating UV absorbent compounds into this existing structure provides UV protection without significantly increasing overall structural complexity or thickness.
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 improves transmittance and polarization characteristics, reduces external light reflection, and maintains optical unit performance even under UV radiation, resulting in better display quality and reduced thickness and increased flexibility of foldable display devices.
Implementation Method 1
a phase difference layer including a UV absorbent
Implementation Method 2
a phase difference layer including a UV absorbent, and a linear polarization layer on the phase difference layer
Implementation Method 3
a linear polarization layer on the phase difference layer
Data Source
AI summary
An optical unit of embodiments of the present disclosure includes a phase difference layer including a UV absorbent, and a linear polarization layer on the phase difference layer. The phase difference layer may further includes a base film, a liquid crystal layer, and an overcoat layer on the liquid crystal layer. The resulting optical unit and the organic light emitting display including the same may have improved polarization characteristics and optical characteristics such as transmittance, and excellent external light anti-reflection characteristics and flexibility.