Optical Sensor Substrate Layout for Compact Biometric Detection
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Solution Overview
Problem
Existing detection devices that incorporate optical sensors and a substrate are bulky due to separate accommodation of components, necessitating a smaller form factor without compromising functionality.
Innovation Solution
A detection device design featuring a substrate with optical sensors and a flexible printed circuit board, where the substrate is coupled to the circuit board with a notch overlapping the light source, allowing for a compact arrangement and shared components, including a stacked electrode configuration for the sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If optical sensors and substrate are separately fixed and accommodated in an annular housing, then the device can accommodate all necessary components, but the housing becomes larger in size
Solution Approach 1:
The patent merges the substrate and flexible printed circuit board into a single integrated structure. The substrate serves dual purposes: supporting optical sensors and providing electrical connections through integrated terminal parts that directly connect to the flexible printed circuit board, eliminating the need for separate component accommodation and reducing overall housing size.
Solution Approach 2:
The patent utilizes the flexible printed circuit board's ability to bend and deform, transitioning from a rigid two-dimensional planar structure to a three-dimensional configured structure. This allows the board to wrap around or conform to the annular housing geometry, maximizing space utilization and reducing the required housing volume.
2Adaptability or versatility
If multiple optical sensors and electronic components are mounted on separate substrates, then detection functionality is enhanced, but the device complexity and size increase
Solution Approach 1:
The substrate is designed as a multi-functional component that simultaneously serves as the mounting platform for optical sensors, provides electrical interconnection through integrated terminal parts, and structurally supports the flexible printed circuit board. This universal design reduces the number of separate components needed while maintaining full detection functionality.
Solution Approach 2:
The patent segments the substrate into functional zones: areas for mounting optical sensors, areas for providing terminal parts with electrical connections, and areas for structural support. This segmentation allows each function to be optimized independently while maintaining an integrated overall structure that reduces complexity.
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 compact design enables efficient detection of biometric information without increasing the device's size, facilitating easy wearability and reducing the need for additional space for multiple sensors and components.
Implementation Method 1
a flexible printed circuit board on which a light source and a plurality of electronic components are mounted. The flexible printed circuit board is bent
Implementation Method 2
A lower electrode, a lower buffer layer, an active layer, an upper buffer layer, an upper electrode, and a sealing film are stacked on the substrate in the order as listed, in each of the first optical sensor and the second optical sensor
Data Source
AI summary
A detection device includes: a substrate having opposite ends with a notch therebetween; a terminal part provided at one end of the substrate; a first optical sensor on the substrate between the notch and the terminal part; a second optical sensor on the substrate between the notch and another end of the substrate; and a flexible printed circuit board provided with a light source and electronic components. A lower electrode, a lower buffer layer, an active layer, an upper buffer layer, an upper electrode, and a sealing film are stacked on the substrate in each of the first and second optical sensors. The lower electrodes of the first and second optical sensors are coupled to the terminal part. The terminal part is coupled to an end of the flexible printed circuit board. The flexible printed circuit board is bent. The notch is disposed at a location overlapping the light source.