Under-Screen Fingerprint Sensor Layout for Signal Noise Reduction
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Solution Overview
Problem
Under-screen fingerprint recognition technologies face challenges in reducing signal noise without using light-shielding metals, which can affect the display effect by causing visualization issues.
Innovation Solution
A sensor device with a first detection region and a second detection region, where the first detection region comprises detector units with insulating layers and the second detection region comprises sensor units with photosensitive layers, allowing for noise reduction by using common mode noise signals without light-shielding metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light-shielding metals are used to reduce signal noise in under-screen fingerprint recognition, then signal noise is reduced, but the display effect deteriorates due to visualization issues
Solution Approach 1:
The patent extracts and removes the light-shielding metal layer from the sensor structure. By eliminating this harmful component, the display quality is improved while alternative noise reduction methods are implemented through detector units in peripheral regions that do not interfere with light transmission to the photosensitive layers.
Solution Approach 2:
The patent introduces detector units as intermediary elements that capture common mode noise signals from peripheral regions. These detector units act as mediators to identify and help eliminate noise affecting the sensor units, providing noise reduction without requiring light-shielding metals that would compromise display quality.
2Measurement precision
If detector units with insulating layers are added to reduce noise, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The patent segments the sensor device into distinct functional regions: detector units in peripheral regions and sensor units in a central region. Each detector unit comprises detection electrodes with insulating layers configured to capture noise signals, while sensor units comprise photosensitive layers for fingerprint detection. This segmentation allows noise reduction functionality to be added without significantly complicating the overall device structure.
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 approach effectively reduces signal noise and improves the signal-to-noise ratio without affecting the display effect, as it does not require light-shielding metals, thus maintaining the display's visual integrity.
Implementation Method 1
the sensor unit comprises a first sensor electrode, a second sensor electrode and a first photosensitive layer, and the first photosensitive layer is electrically connected to the first sensor electrode and the second sensor electrode
Data Source
AI summary
A sensor device, an electronic apparatus and a method for reducing signal noise are provided. The sensor device includes a first detection region and a second detection region. The first detection region includes at least one detector unit, the detector unit includes a first detection electrode and a second detection electrode opposed to each other and a first insulating layer, the first detection electrode is electrically insulated from the second detection electrode by the first insulating layer, the second detection region includes at least one detector unit, the sensor unit includes a first sensor electrode, a second sensor electrode and a first photosensitive layer, and the first photosensitive layer is electrically connected to the first sensor electrode and the second sensor electrode.