Phase Difference Film for Suppressing Reflection and Tinting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing circularly polarizing plates in organic electroluminescent display devices fail to adequately suppress external light reflection and tinting, especially during white display, leading to suboptimal visual performance.
Innovation Solution
A phase difference film with specific optical properties, including in-plane retardation and chromaticity characteristics, is integrated into the circularly polarizing plate, utilizing a liquid crystal compound with reciprocal wavelength dispersibility and a polarizer to minimize reflection and tinting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional phase difference film is used in the circularly polarizing plate, then the basic function of suppressing reflection is provided, but the reflection of external light and tinting of reflected light cannot be sufficiently suppressed
Solution Approach 1:
The patent applies parameter changes by precisely controlling the in-plane retardation to be 100 to 200 nm at a wavelength of 550 nm, and by defining specific slope requirements for the wavelength dispersion characteristics. These parameter specifications enable the phase difference film to achieve superior suppression of external light reflection and tinting while maintaining display quality.
Solution Approach 2:
The patent uses a composite structure combining a polarizer and a phase difference film formed of liquid crystal compound. This composite material approach allows the system to achieve both polarization function and optimized optical characteristics for reducing reflection and tinting effects.
2Object-affected harmful factors
If the in-plane retardation is optimized to suppress reflection, then external light reflection is reduced, but tinting during white display may increase
Solution Approach 1:
The patent resolves this contradiction by implementing precise parameter control: setting in-plane retardation to 100-200 nm at 550 nm and defining specific slope ranges for wavelength dispersion. These parameters are optimized to simultaneously suppress external light reflection while preventing tinting during white display, achieving a balance between different optical performance requirements.
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 reduces external light reflection and tinting, enhancing the visual performance of organic electroluminescent display devices by ensuring compliance with specific requirements for in-plane retardation and chromaticity, thereby improving display clarity and color accuracy.
Implementation Method 1
utilizing a liquid crystal compound with reciprocal wavelength dispersibility
Implementation Method 2
A phase difference film formed of at least a liquid crystal compound, in which an in-plane retardation at a wavelength of 550 nm is 100 to 200 nm
Data Source
AI summary
The present invention provides a phase difference film in which reflection of external light is suppressed, tinting of reflected light is suppressed, and tinting at the time of white display is suppressed in a case where the phase difference film is applied to a display device; a circularly polarizing plate; and an organic electroluminescent display device. The phase difference film of an embodiment of the present invention has an in-plane retardation of 100 to 200 nm at a wavelength of 550 nm and satisfies Requirement 1: Δxy<0.010 and Requirement 6: 0.10<Slope S≤1.0.