Optical Sensor Electrode Layout for Light Blocking With Fewer Process Steps
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Solution Overview
Problem
Existing optical sensors for detecting fingerprint patterns and vein patterns face challenges in reducing the number of manufacturing processes required for light-blocking layers, which increases complexity and cost.
Innovation Solution
A detection device is designed with a photodiode and a thin-film transistor, where the semiconductor layer is positioned between the light-blocking layer and the photodiode, and an electrode layer is placed between the semiconductor layer and the photodiode, with the source electrode extending to face the light-blocking layer, thereby reducing the number of manufacturing processes needed for light-blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light-blocking layers are provided on both sides of the semiconductor with the semiconductor interposed therebetween, then light blocking effectiveness is improved, but the number of manufacturing processes increases
Solution Approach 1:
The patent combines the light-blocking function with the electrode layer structure. The source electrode and drain electrode are configured to extend to positions facing the light-blocking layer, allowing the electrode layer to serve dual purposes: electrical conduction and light blocking. This merging of functions reduces the number of separate manufacturing processes while maintaining effective light blocking on both sides of the semiconductor layer.
Solution Approach 2:
The electrode layer is designed to perform multiple functions: it provides electrical connections for the thin-film transistor and simultaneously acts as a light-blocking layer. By making the source and drain electrodes extend to face the light-blocking layer, the patent creates a multi-functional structure that eliminates the need for separate light-blocking layers, thereby reducing manufacturing complexity while maintaining light blocking effectiveness.
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 effectively blocks light and reduces manufacturing complexity while maintaining the functionality of the optical sensor, enabling efficient detection of fingerprint and vein patterns with improved efficiency and accuracy.
Implementation Method 1
a photodiode
Implementation Method 2
light blocking is required to reduce malfunctions that are caused by a photovoltaic effect of a semiconductor
Data Source
AI summary
A detection device includes a photodiode, and a thin-film transistor coupled to the photodiode. The thin-film transistor includes a semiconductor layer between a light-blocking layer and the photodiode, and an electrode layer between the semiconductor layer and the photodiode, and the electric layer includes a source electrode and a drain electrode of the thin-film transistor. The source electrode extends to a position facing the light-blocking layer with the semiconductor layer interposed therebetween.