Liquid Crystal Aperture for Dynamic Pinhole Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pinhole camera systems require trial-and-error experimentation to find the optimal pinhole diameter for different camera systems, which is time-consuming and costly, and lack flexibility in adjusting aperture sizes for varying wavelength applications.
Innovation Solution
A solid-state aperture and diffraction grating system using liquid crystal technology, where a transparent bottom electrode, a layer of liquid crystal material, and selectively engageable transparent top electrodes allow for electronically controlled aperture size and diffraction patterns, enabling adjustable pinhole diameters and diffraction grating geometries for multiple wavelength applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pinhole aperture is used in optical systems, then infinite depth of field and sharp image resolution are achieved, but the aperture size cannot be adjusted for different wavelength applications and requires trial-and-error experimentation to optimize
Solution Approach 1:
The patent applies liquid crystal technology to create a dynamically adjustable aperture system. By applying different voltages to the liquid crystal layer, the aperture diameter can be changed from a minimum size (when liquid crystal molecules are aligned to scatter light) to a maximum size (when molecules are realigned to transmit light). This dynamic adjustment eliminates the need for trial-and-error experimentation with fixed pinhole apertures, as the optimal aperture size can be quickly adjusted for different wavelength applications and imaging conditions.
Solution Approach 2:
The invention changes the optical parameters of the aperture by utilizing the electro-optic properties of liquid crystals. When voltage is applied, the refractive index and light scattering properties of the liquid crystal layer change, thereby adjusting the effective aperture diameter. This parameter change allows the system to adapt to different wavelength applications without requiring physical replacement or manual adjustment of the aperture, significantly reducing optimization time.
2Adaptability or versatility
If a fixed pinhole diameter is used, then manufacturing simplicity is maintained, but flexibility in adjusting aperture sizes for varying wavelength applications is lost
Solution Approach 1:
The patent replaces mechanical aperture adjustment mechanisms (such as movable diaphragms or interchangeable pinholes) with an electro-optic liquid crystal system. Instead of physically moving or changing mechanical components, the aperture size is controlled by applying electrical voltages to the liquid crystal layer. This substitution maintains manufacturing simplicity while adding significant flexibility for different wavelength applications, as the same device can be electronically reconfigured without mechanical intervention.
3Loss of energy
If conventional mechanical aperture systems are used, then structural simplicity is maintained, but light loss increases and adjustment speed decreases
Solution Approach 1:
The liquid crystal-based aperture system replaces mechanical adjustment mechanisms with an electro-optic control system. When voltage is applied, the liquid crystal molecules realign almost instantaneously to change the aperture size, achieving adjustment speeds much faster than mechanical systems. Additionally, because the liquid crystal layer is transparent when properly aligned, light transmission efficiency is maximized with minimal scattering or absorption, reducing light loss compared to mechanical diaphragms or movable components.
Solution Approach 2:
The liquid crystal aperture can be rapidly switched between different states (open/closed, different aperture sizes) through periodic application of voltage pulses. This allows for high-speed adjustment capability, enabling the system to respond quickly to changing imaging conditions or wavelength requirements without the inertia or mechanical delay associated with traditional mechanical aperture systems.
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 allows for rapid and precise adjustment of pinhole diameters and diffraction patterns, enhancing the flexibility and efficiency of optical systems for photography, fingerprint detection, and spectroscopy, while reducing the need for mechanical components and minimizing light loss.
Implementation Method 1
a layer of liquid crystal material, and a field of selectively engageable transparent top electrodes... applies a voltage differential between one or more selected TTEs and the TBE. An optically transparent region is created in the LC material
Implementation Method 2
The grating is illuminated with light from a light source... A detector detects the diffracted light
Data Source
AI summary
Provided are devices and methods capable of electronically controlling and varying aperture diameters or diffracting light. The method provides a solid-state device made up of a transparent bottom electrode (TBE), a layer of liquid crystal (LC) material overlying the TBE, and a field of selectively engageable transparent top electrodes (TTEs). Light incident to the TTEs is accepted and a voltage differential between one or more selected TTEs and the TBE. As a result, an optically transparent region is created in the LC material interposed between the selected TTEs and the TBE. Depending on the arrangement of the TTEs and their size respective to the wavelength of the incident light, the light is either transmitted through an aperture or diffracted.