Elliptically Polarizing Plate for OLED Antireflection
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Solution Overview
Problem
Current circularly polarizing plates used in organic light-emitting devices have strong viewing angle dependence, leading to deteriorated antireflection performance and reduced visibility 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 +C plate, to control optical properties and minimize reflection across various angles, enhancing visibility and color characteristics on both the front and side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circularly polarizing plate is used to reduce reflected external light, then antireflection performance is improved, but viewing angle dependence causes deterioration of antireflection performance and visibility toward the side
Solution Approach 1:
The circularly polarizing plate is segmented into multiple functional layers: a linear polarizing plate, a first retardation film, a second retardation film, a third retardation film, and a fourth retardation film. Each layer has specific optical properties (retardation values, Nz values, orientation angles) that work together to achieve broadband antireflection across wide viewing angles while eliminating the viewing angle dependence of conventional circularly polarizing plates.
2Illumination intensity
If a circularly polarizing plate is attached to reduce reflected external light, then visibility is improved at the front, but color characteristics and visibility deteriorate on the side due to strong viewing angle dependence
Solution Approach 1:
The patent optimizes multiple optical parameters of the retardation films including retardation values (Rin, Rth), Nz values, and orientation angles. Specifically, the first retardation film has 0 ≤ Rin ≤ 180 nm and 0 ≤ Rth ≤ 220 nm with 0.5 ≤ Nz ≤ 2.0, the second has −180 nm ≤ Rin ≤ 0 nm and −220 nm ≤ Rth ≤ 0 nm with −2.0 ≤ Nz ≤ −0.5, and the third and fourth films have specific parameters that together maintain excellent color characteristics and visibility across front and side viewing angles.
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 effectively prevents external light reflection, improving visibility and display quality of organic light-emitting devices by maintaining excellent reflection and color characteristics across different viewing angles.
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)
Data Source
AI summary
An elliptically polarizing plate and an organic light-emitting device. The elliptically polarizing plate has superior visibility and excellent reflection characteristics and color characteristics on the side as well as the front, and an organic light-emitting device comprising the same.