Optical Filter with Anisotropic Substrate for 3D Display Stability
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Solution Overview
Problem
Existing optical filters for 3D image generation struggle to maintain stable physical properties and effective light division characteristics over time, particularly due to variations in elastic modulus and coefficient of thermal expansion in different in-plane directions, which affect the straightness and durability of the polarization control layer.
Innovation Solution
An optical filter design featuring a substrate layer with distinct elastic modulus and coefficient of thermal expansion in different in-plane directions, combined with a polarization control layer having regions with different phase retardation characteristics, is used to ensure stable physical properties and improved light division capabilities. The substrate layer can be made from materials like triacetyl cellulose or cyclo olefin polymers, and the polarization control layer is formed using liquid crystal layers with specific alignment and polymerization techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a substrate layer with isotropic physical properties is used, then the manufacturing process is simpler, but the polarization control layer cannot maintain stable straightness over time
Solution Approach 1:
The substrate layer is designed with asymmetric physical properties, specifically having different elastic moduli and/or coefficients of thermal expansion in the first and second in-plane directions. This asymmetry compensates for the inherent properties of the polarization control layer, enabling long-term maintenance of straightness without requiring complex additional structures.
2Reliability
If the elastic modulus of the substrate layer is increased to improve durability, then the polarization control layer becomes more stable, but the light division characteristics deteriorate
Solution Approach 1:
The substrate layer is designed with spatially varying physical properties, having different elastic moduli and/or coefficients of thermal expansion in different in-plane directions. This local quality variation allows the substrate to provide appropriate mechanical support in different directions, simultaneously ensuring durability and maintaining optimal light division characteristics.
3Stability of the object's composition
If the coefficient of thermal expansion is made uniform in all directions, then the manufacturing process is easier, but the optical filter cannot maintain stable physical properties under temperature changes
Solution Approach 1:
The substrate layer is designed with asymmetric thermal expansion properties, having different coefficients of thermal expansion in the first and second in-plane directions. This asymmetric design allows the substrate to compensate for thermal stresses in specific directions, maintaining stable physical properties under temperature variations.
4Duration of action of stationary object
If a simple substrate layer is used, then the manufacturing cost is lower, but the polarization control layer cannot maintain its pattern over time
Solution Approach 1:
The substrate layer employs asymmetric physical properties with different elastic moduli and/or coefficients of thermal expansion in perpendicular in-plane directions. This asymmetric configuration provides directional support that maintains the polarization control layer pattern stability over extended periods.
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 optical filter achieves long-term stability and excellent light division characteristics by maintaining the desired physical properties and phase retardation, enhancing the performance of 3D image generation and display devices.
Implementation Method 1
In the substrate layer, an elastic modulus in a first in-plane direction may be different from that in a second in-plane direction perpendicular to the first in-plane direction
Implementation Method 2
In another embodiment, in the substrate layer, a coefficient of thermal expansion (CTE) in a first in-plane direction may be different from that in the second in-plane direction
Implementation Method 3
The polarization control layer may include first and second regions having different phase retardation characteristics from each other to divide incident light into two kinds of light having different polarized states from each other
Implementation Method 4
first and second regions having different phase retardation characteristics from each other
Data Source
AI summary
Provided is an optical filter and a display device. In the optical filter, patterns of first and second regions therein may be stably maintained, and therefore the optical filter capable of ensuring excellent light division characteristics for a long time may be provided.