Synchronous Scan Component for Photo Sensor Noise Reduction
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Solution Overview
Problem
Existing print recognition devices using photo sensors in a matrix suffer from leakage current noise due to illumination of all sensors during the recognition process, which affects signal quality.
Innovation Solution
A print recognition module with a synchronous scan component that dynamically adjusts between a light shielding area and a light transmitting area, ensuring only the scanned photo sensor is illuminated, while others are shielded, thereby reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all photo sensors are illuminated during print recognition, then the recognition process can be performed, but leakage current noise is generated in all photo sensors affecting signal quality
Solution Approach 1:
The patent divides the photo sensor array into multiple rows and scans them sequentially rather than illuminating all sensors simultaneously. This segmentation in time and space allows only one row to be illuminated at a time, eliminating leakage current noise from non-scanned sensors while maintaining recognition functionality.
Solution Approach 2:
The patent implements periodic scanning of photo sensor rows, where each row is illuminated and scanned in sequence over time. This periodic action ensures that at any given moment, only a specific row is active and illuminated, preventing continuous illumination noise while completing the full recognition process through repeated cycles.
2Object-generated harmful factors
If a synchronous scan component is added to shield non-scanned photo sensors, then noise is reduced, but device complexity increases
Solution Approach 1:
The patent introduces a synchronous scan component as an intermediary element positioned between the light source and the photo sensor array. This component dynamically adjusts its light transmission properties to shield non-scanned rows while allowing light through to the currently scanned row, effectively reducing noise without requiring complex hardware modifications to the photo sensors themselves.
Solution Approach 2:
The synchronous scan component is designed to be dynamically controllable, changing its light shielding state in synchronization with the scanning process. This dynamic behavior allows the system to adapt its shielding pattern according to which row is currently being scanned, providing noise reduction while maintaining operational flexibility and avoiding static complex structures.
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 improves the signal-to-noise ratio by selectively illuminating the scanning photo sensor and shielding others, enhancing the accuracy of print recognition signals.
Implementation Method 1
the synchronous scan component is configured to have a first light shielding area and a first light transmitting area
Implementation Method 2
a photo sensor array including a plurality of photo sensors for recognizing a print
Data Source
AI summary
A print recognition module, a method for driving the same, and a display device are disclosed, where a synchronous scan component is added above a sensing surface of a photo sensor array, and the synchronous scan component can be divided into a first light shielding area and a first light transmitting area, both of which are varying dynamically; where the first light transmitting area is formed at least above a photo sensor being scanned to recognize a print, and the first light shielding area can shield the other photo sensors than the photo sensor being scanned to recognize the print, so that these photo sensors will not be illuminated by any light; and as the photo sensors are being scanned, the first light shielding area and the first light transmitting area, in the synchronous scan component are varying in synchronization therewith.