Electro-optical Device for Non-invasive Neuronal Activity Detection
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Solution Overview
Problem
Current techniques for observing neuronal activity are invasive, limited in scale, and lack the ability to simultaneously observe a large number of neurons with high resolution and non-invasively.
Innovation Solution
An electro-optical device using a liquid crystal layer with active variable polarization, which changes the polarization of an incident light beam based on an applied electric field, allowing for non-invasive observation of neuronal activity over a large field without chemical labeling, by controlling the intensity of the electric field applied to the liquid crystals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If patch-clamp techniques are used to observe neuronal activity, then measurement precision is improved, but device complexity and invasiveness increase, limiting the number of neurons that can be observed simultaneously
Solution Approach 1:
The patent replaces the mechanical electrode-based measurement system with an optical detection system using liquid crystals and polarized light. The liquid crystal layer modulates light transmission in response to electric fields generated by neuronal activity, allowing optical detection without physical contact with neurons. This substitution enables observation of many more neurons simultaneously while maintaining measurement precision and eliminating invasiveness.
2Productivity
If microelectrode arrays are used to increase the number of observable neurons, then productivity is improved, but measurement precision deteriorates due to limited resolution at individual neuron level
Solution Approach 1:
The patent segments the detection function across multiple independent pixels in the optical sensor array, where each pixel corresponds to a specific spatial location. This allows simultaneous observation of many individual neurons across a large field of view, with each pixel providing independent measurement data. The segmentation of the liquid crystal layer into regions influenced by different neurons enables parallel detection of individual neuronal activities.
3Measurement precision
If fluorescent labeling techniques are used to track neuronal activity, then measurement precision is improved for single neurons, but object-generated harmful factors increase due to invasiveness and chemical labeling requirements
Solution Approach 1:
The patent replaces chemical fluorescent labeling with a physical optical detection method using liquid crystals. The liquid crystal layer responds to electric fields from neuronal activity by changing its optical properties, enabling detection without any chemical substances being introduced into or applied to the neurons. This eliminates all harmful effects associated with chemical labeling while maintaining the ability to track single neuron activity with high precision.
4Area of stationary object
If conventional optical methods are used for wide field observation, then area of observation is improved, but measurement precision deteriorates due to lack of individual neuron resolution
Solution Approach 1:
The patent applies local quality by making each region of the liquid crystal layer respond differently to local electric fields generated by neurons in corresponding positions. The optical properties of the liquid crystal vary locally based on the electric field strength at each position, enabling spatially resolved detection. This allows the system to maintain high measurement precision for individual neurons across a large observation area, as each local region provides independent detection information.
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
Enables the observation of individual neurons on a pixel scale without contact, over a field greater than 100 cm², with high sensitivity and resolution, allowing for the simultaneous observation of multiple neurons and maintaining non-invasive and non-destructive imaging.
Implementation Method 1
a layer of liquid crystals with active variable polarization... allows, for an incident beam linearly polarized at the input of the liquid crystal layer, the direction of polarization of said incident beam at the output of said liquid crystal layer to vary according to the presence or absence of an electric field applied to said liquid crystal layer
Data Source
Figure 1A~2
Figure 3~7
Figure 4A~6
AI summary
The invention relates to an electro-optical device for detecting an electric field emitted locally by a sample (100), comprising an upper (20) and a lower (21) polarizer, an active layer of liquid crystals (30) of variable polarization included between an upper (50) and a lower (51) alignment layer, having two perpendicular directions of alignment, and an upper (60) and lower (61) electrode liable to be connected to an AC voltage source (70) such that when a voltage difference (Vext) is applied, the layer of liquid crystals is immersed in the electric field formed between the two electrodes. It is essentially characterized in that it comprises a layer of anisotropic electrical conductors (40) in contact with the upper alignment layer or separated therefrom by the upper polarizer, the conductors being configured to transmit said electric field in only one direction secant to the alignment layers.