Liquid Crystal Optical Defocus Lens for Myopia Control
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Solution Overview
Problem
Current optical defocus lenses have long processing periods and high production costs, limiting their effectiveness in myopia prevention and control, as they cannot dynamically adjust optical defocus amounts or disable the defocus function, which affects myopia prevention and control efficacy.
Innovation Solution
An optical defocus lens comprising a first lens layer and at least one liquid crystal lens layer, where the refractive index of liquid crystal molecules is controlled by an electric field to converge or diverge polarized light, forming multiple focal points at different positions, allowing for dynamic adjustment of optical defocus and disabling the defocus function by varying the electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical defocus lenses are used, then myopia prevention and control can be achieved, but the processing period is long and production costs are high
Solution Approach 1:
The patent applies liquid crystal lens layers that can dynamically change their optical properties through electric field control. The liquid crystal molecules can be switched between different refractive index states by applying voltage, enabling real-time adjustment of focal points and defocus amounts without requiring physical reprocessing of the lens, thus dramatically reducing processing time while maintaining myopia prevention efficacy
Solution Approach 2:
The patent changes the refractive index parameter of the liquid crystal material through electric field control. By adjusting the voltage applied to the liquid crystal lens layers, the refractive index can be dynamically modified, allowing the lens to adapt different optical parameters for different viewing distances and defocus requirements, eliminating the need for time-consuming custom processing
2Reliability
If traditional optical defocus lenses are used, then myopia prevention and control can be achieved, but production costs are high
Solution Approach 1:
The patent creates a universal lens structure that can serve multiple functions: it can provide myopia prevention through optical defocus, adapt to different viewing distances (near and far), and be dynamically reconfigured for different optical requirements. This multi-functionality is achieved through the liquid crystal lens layers that can be electrically controlled to provide various defocus amounts, eliminating the need for multiple specialized lenses and reducing production costs
Solution Approach 2:
The patent replaces traditional mechanical or physical lens processing methods with electric field control of liquid crystal molecules. Instead of physically shaping or customizing lenses for different prescriptions, the system uses electrical signals to adjust the optical properties, significantly simplifying the manufacturing process and reducing costs while maintaining customization capability
3Ease of manufacture
If fixed optical defocus amount lenses are used, then manufacturing is simplified, but adaptability to different eye distances and individual needs is reduced
Solution Approach 1:
The patent implements dynamic control of the liquid crystal lens layers through electric fields, allowing the optical defocus amount to be adjusted in real-time based on viewing distance and individual needs. The system can switch between different focal points and defocus levels without any physical modification to the lens structure, maintaining manufacturing simplicity while achieving full adaptability
Solution Approach 2:
The patent adds the dimension of temporal variability to the optical properties of the lens. By controlling the liquid crystal molecules with electric fields over time, the lens can adapt its characteristics dynamically, transforming from a static, fixed-parameter lens to a dynamic system that responds to changing viewing conditions and individual 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
This solution enables efficient implementation of optical defocus while reducing production costs and processing time, allowing for personalized optical defocus amounts based on individual eye distances, improving myopia prevention and control by dynamically adjusting focal points.
Implementation Method 1
a refractive index of liquid crystal molecules in each of the at least one liquid crystal lens layer is controlled by an electric field, to converge or diverge polarized light that is incident to a direction of each liquid crystal lens layer to form a focal point
Implementation Method 2
converge or diverge polarized light that is incident to a direction of each liquid crystal lens layer
Data Source
AI summary
An optical defocus lens includes: a first lens layer and at least one liquid crystal lens layer, where the first lens layer is a concave lens, a convex lens, or a plano lens, a refractive index of liquid crystal molecules in each of the at least one liquid crystal lens layer is controlled by an electric field, to converge or diverge polarized light that is incident to a direction of each liquid crystal lens layer to form a focal point; a first liquid crystal lens layer is configured to converge or diverge polarized light in a first direction to form a first focal point; and the first lens layer or a second liquid crystal lens layer is configured to converge or diverge polarized light in a second direction to form a second focal point.