Circular Polarizing Plate with Flat Dispersion Retardation Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing circularly polarizing plates using retardation films with reverse dispersion properties are expensive and do not effectively improve reflection color sense.
Innovation Solution
A circularly polarizing plate is designed using a retardation film with flat dispersion characteristics, combined with an antireflection film that has a reflectance of 2.0% or less for light with a wavelength of 550 nm, and a pressure-sensitive adhesive layer to improve reflection color sense.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a retardation film with reverse dispersion properties is used, then the reflection color sense is improved, but the material cost increases significantly
Solution Approach 1:
The patent changes the dispersion characteristics parameter of the retardation film from reverse dispersion to flat dispersion, and adjusts the retardation value to 130nm or more at 550nm wavelength. This parameter change allows achieving good reflection color sense with lower cost materials that have flat dispersion characteristics instead of expensive reverse dispersion materials
Solution Approach 2:
The patent creates a composite circularly polarizing plate structure combining specific layers: a polarizer layer, a retardation film layer with flat dispersion characteristics and specific retardation value, and an antireflection layer. This composite structure achieves the desired optical performance through the synergistic effect of multiple layers rather than relying solely on expensive reverse dispersion retardation films
2Object-affected harmful factors
If an antireflection film with low reflectance is used, then surface reflection is reduced, but the overall device complexity increases
Solution Approach 1:
The patent merges the antireflection function with the existing circularly polarizing plate structure by adding an antireflection layer to the conventional polarizer-retardation film combination. This integration reduces surface reflection of the OLED panel while maintaining the circular polarization function, achieving both goals within a single integrated component rather than separate elements
Solution Approach 2:
The circularly polarizing plate structure is designed to serve multiple functions simultaneously: it provides circular polarization for display applications, reduces surface reflection through the antireflection layer, and maintains appropriate color characteristics. This multi-functionality reduces the need for separate components and simplifies the overall device architecture
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 proposed circularly polarizing plate achieves improved reflection color sense while using a cost-effective retardation film with flat dispersion characteristics, maintaining high transmittance and low reflectance.
Implementation Method 1
the retardation film (30) and a pressure-sensitive adhesive layer (40) sequentially. The retardation film may have a flat dispersion characteristic
Implementation Method 2
The antireflection film for light having a wavelength of 550 nm may have reflectance of 2.0% or less
Data Source
AI summary
The present application relates to a circularly polarizing plate. The present application can provide a circularly polarizing plate which can improve a reflection color sense by using a retardation film having flat dispersion characteristics. In addition, the present application can provide an OLED device comprising the circularly polarizing plate.