TFT-Based Cell Isolation Device for Large-Area DEP Manipulation
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Solution Overview
Problem
Conventional Optically Induced Dielectrophoresis (ODEP) cell manipulation devices require high power light sources, have limited field-of-view, and cannot achieve cell manipulation over large areas due to the need for high resolution and collimated light.
Innovation Solution
A thin-film transistor (TFT)-based cell isolation device with a cell manipulation panel that includes a pixel array with TFTs, vias, and electrodes, allowing for dielectrophoresis (DEP) force manipulation of cells within a fluid medium across a larger area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional ODEP cell manipulation device uses a light source to generate electric fields, then cell manipulation is achieved, but power consumption increases
Solution Approach 1:
The patent removes the light source component from the ODEP device, extracting the optical generation mechanism and replacing it with direct electrical field generation through electrodes. This eliminates the need for light sources while maintaining cell manipulation capability through electrical means alone.
Solution Approach 2:
The patent replaces the optical system (light source, photoconductive layer) with a direct electrical system (electrodes connected to voltage sources). This substitution eliminates the need for optical-to-electrical conversion and directly generates the required electric fields for DEP forces.
2Measurement precision
If a conventional ODEP device uses a light source with small field-of-view to maintain optical resolution, then optical resolution is improved, but the manipulation area is limited
Solution Approach 1:
The patent removes the optical system entirely, eliminating the field-of-view constraint that limits manipulation area. Without light sources and photoconductive layers, the device can generate electric fields across the entire electrode array area, enabling large-area cell manipulation.
Solution Approach 2:
The patent transitions from optical field generation (constrained by light propagation and focusing) to direct electrical field generation through planar electrodes. This dimensional change allows electric fields to be applied uniformly across large areas without the resolution limitations of optical systems.
3Measurement precision
If a conventional ODEP device uses a collimated light source for high resolution, then cell manipulation precision is improved, but power consumption increases
Solution Approach 1:
The patent removes the collimated light source and photoconductive layer, eliminating the need for optical energy input. Cell manipulation precision is maintained through direct electrical field application, which consumes less power than generating and focusing high-intensity light beams.
Solution Approach 2:
The patent replaces the optical precision system with a direct electrical control system. Electrodes can be independently controlled with precise voltage levels, achieving cell manipulation precision without the high power consumption required for collimated light sources.
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 TFT-based cell isolation device efficiently captures and releases cells using DEP forces, enabling manipulation over a larger area with reduced power consumption and improved optical resolution.
Implementation Method 1
one of the cells is captured in the corresponding via from the fluid medium by a dielectrophoresis (DEP) force
Implementation Method 2
the second electrode is grounded to release the one of the cells being captured to the fluid medium
Data Source
AI summary
A cell manipulation panel includes a pixel array defining multiple pixels, an insulating layer forming multiple vias, and a cell gap provided with a fluid medium having cells therein. Each pixel has a TFT and corresponds to a corresponding via. The TFT includes a gate electrode, a first electrode, and a second electrode partially exposed to the fluid medium through the corresponding via. For each pixel, in an operational mode, when the gate electrode is provided with an OFF signal and the first electrode is not grounded, the TFT is turned off, allowing one of the cells in the fluid medium to be captured in the corresponding via by a dielectrophoresis (DEP) force. When the gate electrode is provided with an ON signal and the first electrode is grounded, the TFT is turned on, and the second electrode is grounded to release the captured cell to the fluid medium.