Flexible Neural Implant Using Active Matrix OLEDs for Selective Stimulation
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Solution Overview
Problem
Current optogenetics methods for neural stimulation, such as fiber-optic and discrete LED arrays, face limitations in resolution, power consumption, and tissue heating due to the need for extensive interconnect wiring and high power requirements, making it difficult to selectively target specific neural regions and manage complex LED arrays.
Innovation Solution
A high-resolution, untethered flexible cortical implant using an active matrix thin-film transistor (TFT) array with organic light-emitting diode (OLED) technology, allowing individual OLED pixels to be selectively addressed and turned on for precise neural stimulation, reducing the number of required connections and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If discrete LED arrays are used for neural stimulation, then the ability to selectively target specific neural regions is improved, but the device complexity and number of required interconnects increases significantly
Solution Approach 1:
The implant is divided into multiple independently addressable LED elements arranged in a grid pattern, allowing selective stimulation of specific neural regions. Each LED can be individually controlled through shared row and column interconnects, reducing the total number of wires needed compared to fully independent connections.
Solution Approach 2:
Multiple LED interconnect lines are merged into shared row and column buses that intersect to form a matrix addressing scheme. This allows any LED at any position in the grid to be addressed by the combination of its row and column signals, dramatically reducing the interconnect count from O(n²) to O(n).
2Area of stationary object
If the LED array size is increased to improve coverage, then the area of neural tissue that can be stimulated is improved, but the power consumption increases
Solution Approach 1:
The implant enables localized stimulation by activating only the specific LED elements needed for the therapeutic application. Different regions of the LED array can be selectively addressed, allowing power to be concentrated where needed rather than illuminating the entire array, thus maintaining low overall power consumption while providing flexible coverage.
Solution Approach 2:
The system uses partial activation of the LED array, engaging only the necessary subset of LEDs for each specific application. This allows the implant to provide sufficient stimulation coverage for various neural targets without requiring all LEDs to operate simultaneously, thereby controlling power consumption.
3Measurement precision
If the LED array density is increased to improve resolution, then the manufacturing precision required increases, making individual bonding of each LED more difficult
Solution Approach 1:
The implant utilizes a integrated circuit board with pre-fabricated interconnect traces that automatically provide electrical connections to each LED position in the array. This eliminates the need for manual bonding of individual wires to each LED, as the circuit board's printed circuitry self-provides the necessary interconnections during manufacturing.
Solution Approach 2:
Manual mechanical bonding of individual LED interconnects is replaced with automated PCB fabrication processes. The interconnections are created through photolithography and metal deposition on the circuit board, substituting precise manual wire bonding with automated manufacturing techniques that are better suited for high-density arrays.
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 precise, localized neural stimulation with reduced power consumption, allowing for wireless inductive power sourcing and minimizing tissue heating, thereby improving the ability to selectively target small groups of neurons with high resolution and efficiency.
Implementation Method 1
an active matrix thin-film transistor (TFT) array with organic light-emitting diode (OLED) technology, allowing individual OLED pixels to be selectively addressed and turned on
Implementation Method 2
a mechanically compliant thin biocompatible substrate
Data Source
AI summary
Systems and methods for stimulating neural tissue are disclosed. An array of optically emissive pixels is configured to deliver light to the neural tissue of a subject. Individual pixels within the array can be addressed to selectively illuminate a portion of the neural tissue when a neurological event occurs. The system can also include an array of microelectrodes in electrical communication with the array of pixels and a power source. A biocompatible substrate can be used to support the microelectrodes pixels, and the power source. A microelectrode circuit and a pixel circuit can also be supported by the biocompatible substrate.