Fingerprint Sensor Pixel Layout for Low-Noise Display Identification
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Solution Overview
Problem
Existing fingerprint identification technologies using pixel arrays face challenges in accurately capturing valley and ridge information due to noise interference and inefficiencies in signal processing.
Innovation Solution
A fingerprint identification module is developed, featuring a substrate with a fingerprint identification area and a peripheral area, incorporating a photoelectric sensing structure with gate lines, signal sensing lines, and pixel units. Each pixel unit includes a thin film transistor and a photoelectric sensor with a specific electrode and photosensitive pattern configuration, optimized with a 40% to 90% area ratio of the photoelectric sensor to the pixel unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the photoelectric sensor area is increased to improve signal detection capability, then the signal processing efficiency is improved, but the pixel unit area occupied by the photoelectric sensor increases, leaving less space for other components
Solution Approach 1:
The patent optimizes the area ratio parameter of the photoelectric sensor within the pixel unit to a specific range (40%-90%). This parameter change ensures sufficient photoelectric conversion area for accurate fingerprint detection while maintaining adequate space for thin film transistors and signal sensing lines, thus resolving the contradiction between detection precision and area utilization.
2Measurement precision
If the pixel array density is increased to improve fingerprint detail capture, then the measurement precision is improved, but the noise interference increases due to closer spacing of signal sensing lines
Solution Approach 1:
The patent introduces an optimized signal sensing line structure that acts as an intermediary between adjacent pixel units. The signal sensing lines are designed with specific routing patterns that reduce cross-talk and noise coupling between neighboring pixels, enabling high-density pixel arrays to achieve improved fingerprint detail capture without excessive noise interference.
3Productivity
If more signal sensing lines are added to improve signal processing capability, then the productivity of fingerprint identification is improved, but the device complexity increases
Solution Approach 1:
The patent segments the signal sensing lines into distinct groups corresponding to different pixel unit regions. Each signal sensing line is designed to collect signals from specific pixel units, creating a modular signal processing architecture. This segmentation improves signal processing efficiency by reducing cross-talk while maintaining manageable device complexity through systematic organization.
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 solution enhances the accuracy of fingerprint identification by reducing noise interference and improving signal processing efficiency, leading to better capture of valley and ridge information.
Implementation Method 1
the photoelectric sensor is configured to receive detection light and output a corresponding electrical signal
Data Source
AI summary
The re is provided a fingerprint identification module, including a substrate having a fingerprint identification area and a peripheral area; a photoelectric sensing structure in the fingerprint identification area, and including pixel units; each pixel unit includes a thin film transistor having a gate electrode coupled to a corresponding gate line and a first electrode coupled to a corresponding signal sensing line; the fingerprint identification area includes a photosensitive region, the pixel unit in the photosensitive region further includes a photoelectric sensor including a third electrode, a photosensitive pattern and a fourth electrode which are sequentially stacked along a direction away from the substrate, and the third electrode is coupled to a second electrode of the thin film transistor in the same pixel unit as that where the photoelectric sensor is located; an area ratio of the photoelectric sensor to the pixel unit corresponding thereto ranges from 40% to 90%.