Microfluidic System Photosensitive Detection Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing microfluidic systems require separate devices for impedance detection, leading to complex manufacturing processes and susceptibility to signal interference, which affects detection accuracy.
Innovation Solution
A microfluidic system incorporating an array of photosensitivity detection circuits and driving circuits with photosensitive transistors, where the position and size of a liquid drop are detected based on photosensitive characteristics, eliminating the need for additional detection components and reducing signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate impedance detection device is used in the microfluidic system, then the liquid drop position and size can be detected, but the manufacturing process becomes complex and signal interference occurs affecting detection accuracy
Solution Approach 1:
The patent combines the detection function and driving function into a single integrated circuit layer. The detection circuit includes a detection transistor whose source electrode connects to a first power supply voltage signal line, gate electrode to a first scan signal line, and drain electrode to a first read signal line. The driving circuit includes a driving transistor whose gate electrode connects to a second scan signal line and source electrode to a second power supply voltage signal line, with the drain electrode forming the driving electrode. This integration eliminates the need for separate impedance detection devices, simplifying the manufacturing process while maintaining detection accuracy through dedicated detection circuit pathways that avoid signal interference.
2Measurement precision
If a separate impedance detection device is provided, then liquid drop detection is possible, but the system is susceptible to signal interference which adversely affects detection accuracy
Solution Approach 1:
The patent segments the circuit functions into distinct detection and driving circuits with separate signal pathways. The detection circuit uses dedicated signal lines (first scan signal line, first read signal line, first power supply voltage signal line) that are electrically isolated from the driving circuit's signal lines (second scan signal line, driving electrode connections). This segmentation prevents signal interference between detection and driving operations, ensuring accurate impedance detection while maintaining the ability to manipulate liquid drops through the driving circuit.
3Measurement precision
If additional detection components are added to the microfluidic system, then detection capability is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent implements a multi-functional integrated circuit layer that simultaneously performs detection, scanning, and driving functions. The detection transistor serves as both the sensing element and part of the signal processing pathway, while the driving transistor provides actuation capability. Both circuits share the same substrate and circuit layer structure, allowing a single manufacturing process to produce all functional elements. This universal approach eliminates the need for separate detection devices and multiple fabrication steps, simplifying manufacturing while maintaining comprehensive detection and control capabilities.
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
Simplifies the manufacturing process and improves detection accuracy by using photosensitive transistors to control the movement trajectory of liquid drops without additional detection components, thereby enhancing the system's efficiency.
Implementation Method 1
incorporating an array of photosensitivity detection circuits and driving circuits with photosensitive transistors, where the position and size of a liquid drop are detected based on photosensitive characteristics
Implementation Method 2
a first hydrophobic layer at an outermost surface of the upper substrate, and the outermost surface of the upper substrate facing the liquid drop accommodation space; a second hydrophobic layer at an outermost surface of the lower substrate
Data Source
AI summary
A microfluidic system includes a liquid drop accommodation space, an array of photosensitivity detection circuits and an array of driving circuits between an upper substrate and a lower substrate. Each photosensitivity detection circuit includes a photosensitive transistor and a first gating transistor. The photosensitive transistor has a gate electrode coupled to a first scan signal line, a source electrode coupled to a first power supply voltage signal line, and a drain electrode coupled to a source electrode of the first gating transistor. The first gating transistor has a gate electrode coupled to a second scan signal line, and a drain electrode coupled to a read signal line. Each driving circuit includes a driving transistor and a driving electrode. The driving transistor has a gate electrode coupled to a third scan signal line, a source electrode coupled to a data signal line, and a drain electrode coupled to the driving electrode.