Elliptically Polarizing Plate for OLED Side Visibility
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Solution Overview
Problem
Current circularly polarizing plates exhibit strong viewing angle dependence, leading to deteriorated antireflection performance and reduced visibility in organic light-emitting devices due to reflected external light.
Innovation Solution
An elliptically polarizing plate is designed with a specific configuration of linear polarizer and retardation films, including a -B plate, +B plate, +C plate, and quarter-wave phase retardation characteristics, to control optical properties and minimize reflection and color differences across viewing angles, thereby enhancing visibility on both the front and side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circularly polarizing plate is attached to reduce leakage of reflected external light, then antireflection performance is improved, but viewing angle dependence increases and visibility deteriorates toward the side
Solution Approach 1:
The circularly polarizing plate is segmented into multiple functional layers: a linear polarizing layer and multiple retardation layers (first, second, third, and fourth retardation layers). Each layer performs a specific optical function, allowing independent optimization of antireflection performance and viewing angle characteristics. This segmentation enables the system to achieve both reduced reflected light leakage and improved side visibility.
Solution Approach 2:
The invention uses a composite structure combining different types of polarizing and retardation materials with specific optical properties. The linear polarizing layer is combined with retardation layers having different retardation values and orientation characteristics, creating a composite system that simultaneously achieves broadband antireflection performance and reduced viewing angle dependence for improved visibility.
2Object-affected harmful factors
If a circularly polarizing plate is used to prevent reflected external light leakage, then display quality is improved, but color characteristics deteriorate on the side due to strong viewing angle dependence
Solution Approach 1:
The polarizing plate is divided into multiple functional layers with distinct optical characteristics. The linear polarizing layer works in combination with multiple retardation layers, each contributing specific phase retardation effects. This segmentation allows precise control over polarization state and phase delay across different viewing angles, maintaining consistent color characteristics from front to side views while preventing reflected light leakage.
Solution Approach 2:
The invention employs multiple retardation layers with different retardation values (Rin and Rth parameters) and orientation angles. By carefully selecting and adjusting these optical parameters for each layer, the system achieves broadband antireflection performance while maintaining stable color characteristics across viewing angles, effectively resolving the contradiction between antireflection and color consistency.
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 elliptically polarizing plate achieves superior visibility and color characteristics on the side and front, effectively preventing external light reflection and improving display quality in organic light-emitting devices by maintaining low color difference values and antireflection performance.
Implementation Method 1
a linear polarizer (50)... selectively transmitting light is a linearly polarized light that vibrates in any one direction
Implementation Method 2
a first retardation film (10), a second retardation film (20), a third retardation film (30) and a fourth retardation film (40)... quarter-wave phase retardation characteristics
Data Source
AI summary
An elliptically polarizing plate and an organic light-emitting device. The elliptically polarizing plate provides superior visibility, and excellent reflection characteristics and color characteristics on the side as well as the front of a device, and an organic light-emitting device comprising the same.