Optical Sensor Array Power Layout for Uniform Sensitivity
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Solution Overview
Problem
Optical sensors with high sheet resistance in a common upper electrode lead to differences in power supply capacity and sensitivity among elements, causing potential failure of multiple sensors.
Innovation Solution
The detection device employs independent power supply electrodes and wiring lines for each optical sensor, reducing the resistance and sensitivity differences by supplying power to each sensor from separate power systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common upper electrode is used to supply power to multiple optical sensors, then the device complexity is reduced, but the sheet resistance causes differences in power supply capacity and sensitivity among sensors
Solution Approach 1:
The patent divides the common upper electrode into multiple separate upper electrodes, with each optical sensor having its own dedicated upper electrode. This segmentation eliminates the sheet resistance variations that occur in a common electrode structure, ensuring uniform power supply capacity and consistent sensitivity across all sensors in the array.
2Ease of manufacture
If a common upper electrode is used for power supply, then the manufacturing process is simplified, but the reliability of the sensor array decreases due to potential failure of multiple sensors
Solution Approach 1:
By segmenting the power supply structure into separate upper electrodes for each sensor, the patent ensures that a failure in one sensor does not propagate to other sensors. Each sensor operates independently with its own power supply path, significantly improving the overall reliability of the sensor array while maintaining manufacturing feasibility through standardized electrode fabrication processes.
3Measurement precision
If independent power supply electrodes are used for each optical sensor, then the sensitivity uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent merges the lower electrodes of multiple optical sensors into a common lower electrode structure, while maintaining separate upper electrodes for each sensor. This combining approach reduces the overall device complexity by sharing common components (lower electrodes, substrate, wiring) while preserving the benefits of independent power supply for each sensor through separate upper electrodes.
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 configuration minimizes the likelihood of sensor failure and maintains consistent sensitivity across the array, enabling reliable long-term operation and detection of biometric information.
Implementation Method 1
sensors each including a plurality of photodiodes in which an organic semiconductor material is used as an active layer
Data Source
AI summary
According to an aspect, a detection device includes: a substrate having a notch; a terminal part provided at one end in the first direction of the substrate; a first optical sensor provided between the notch and the terminal part; and a second optical sensor provided between the notch and another end of the substrate. The upper electrode of the first optical sensor is coupled to a first power supply electrode and coupled to the terminal part via a first wiring line coupled to the first power supply electrode. The upper electrode of the second optical sensor is coupled to a second power supply electrode and coupled to the terminal part via a second wiring line coupled to the second power supply electrode. The lower electrodes of the first and second optical sensors are coupled to the terminal part via third wiring lines.