Wavelength Selective Phase Difference Element Angular Characteristics
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Solution Overview
Problem
Existing wavelength selective phase difference elements face challenges in improving their angular characteristics, as they often require increasing the number of waveplates to maintain vertical optical properties, which deteriorates their angular performance.
Innovation Solution
A wavelength selective phase difference element is designed with a multi-layer structure where a first member has a plurality of layers stacked between the light incident and output surfaces, and a second member with an optical axis parallel to the Z-axis direction is disposed on the light output surface to offset optical path length differences for both normal and obliquely incident light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of waveplates is increased to maintain vertical optical properties, then the vertical optical properties are improved, but the angular characteristics deteriorate
Solution Approach 1:
The patent changes the optical axis orientation parameter of the third waveplate from the conventional in-plane configuration to an out-of-plane configuration (optical axis parallel to Z-axis). This parameter change allows the waveplate to compensate for optical path length differences caused by oblique incidence while maintaining wavelength selectivity, thereby improving angular characteristics without sacrificing vertical optical properties
Solution Approach 2:
The patent creates a composite waveplate structure by combining multiple waveplates with different orientations and properties. The third waveplate with out-of-plane optical axis is composite with the first and second waveplates, forming a integrated wavelength selective phase difference element that achieves both vertical and angular optical performance
2Reliability
If the number of waveplates is increased to improve vertical optical properties, then the vertical optical properties are improved, but the device complexity increases
Solution Approach 1:
The patent merges the functions of wavelength selection and angular characteristic compensation into a single integrated waveplate assembly. By combining the third waveplate with out-of-plane optical axis with the conventional in-plane waveplates, the device achieves both vertical and angular optical performance without requiring separate compensation mechanisms, thereby reducing overall device complexity
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
This configuration enhances both the vertical and angular optical properties by selectively transmitting light and improving crossed Nicol transmittances, particularly in projection display applications.
Implementation Method 1
a second member disposed on a light output surface of the first member and having an optical axis parallel to a Z-axis direction... offset an optical path length difference between light incident perpendicularly on the first member and light incident obliquely on the first member when the light penetrates the first member
Data Source
AI summary
A wavelength selective phase difference element according to an embodiment of the present disclosure includes: a light incident surface and a light output surface that are opposed to each other in a Z-axis direction when three axes including an X axis, a Y axis, and a Z axis are orthogonal to one another; a first member that has a multi-layer structure where a plurality of layers are stacked between the light incident surface and the light output surface; and a second member that is disposed on the light output surface of the first member and has an optical axis parallel to the Z-axis direction.