Imaging Backplane Reset Sub-Circuits for Fingerprint Afterimage Removal
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Solution Overview
Problem
Point light source imaging systems experience afterimages due to residual charges in photoelectric sensors, leading to prolonged time intervals between light source activations, which slow down fingerprint identification processes.
Innovation Solution
The imaging backplane incorporates a first and second reset sub-circuit to globally reset imaging units not receiving light, ensuring that residual charges are eliminated, thereby reducing the time interval between point light source activations and enhancing fingerprint identification efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If point light sources are activated in time-sharing manner for fingerprint identification, then fingerprint identification can be performed using point light source imaging, but residual charges in photoelectric sensors cause afterimages that require prolonged time intervals between light source activations
Solution Approach 1:
The patent applies preliminary action by resetting the photoelectric sensors before each light source activation. The reset sub-circuit is configured to clear residual charges from the photoelectric sensors in advance, before the next point light source is activated. This preliminary resetting action prevents afterimages from forming, allowing the system to maintain high fingerprint identification accuracy while significantly reducing the time interval between successive light source activations.
2Productivity
If time interval between point light source activations is reduced to improve fingerprint identification speed, then productivity increases, but afterimages from residual charges interfere with measurement precision
Solution Approach 1:
The patent introduces an intermediary element - the reset sub-circuit - that mediates between the point light sources and the photoelectric sensors. This reset sub-circuit actively clears residual charges from the sensors between light source activations, acting as a mediator that prevents afterimages from interfering with the measurement process. This intermediary mechanism enables the system to operate at high speeds while maintaining measurement precision, as the reset function ensures clean sensor states for each new measurement cycle.
3Measurement precision
If reset operations are performed on all imaging units between light source activations, then afterimages are eliminated improving measurement precision, but device complexity increases due to additional reset sub-circuits
Solution Approach 1:
The patent applies merging by integrating the reset functionality into a dedicated reset sub-circuit that is coupled to the imaging backplane. Rather than adding complex reset mechanisms to each individual photoelectric sensor, the reset sub-circuit provides a unified, centralized reset function that can clear residual charges across multiple sensors efficiently. This merged approach maintains measurement precision by ensuring thorough reset operations while avoiding the excessive complexity that would result from individual reset circuits for each sensor element.
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 effectively eliminates afterimages by resetting imaging units during the activation of each point light source, reducing the overall fingerprint identification time and improving the accuracy of fingerprint recognition.
Implementation Method 1
the photoelectric sensor receives the light reflected by the finger to identify the fingerprint
Data Source
AI summary
An imaging backplane, a driving method thereof and a fingerprint identification panel are provided, the imaging backplane includes M rows and N columns of imaging structures, 2M rows of first signal lines, 2N columns of second signal lines, a first reset sub-circuit and a second reset sub-circuit; wherein each imaging structure includes a first imaging unit and a second imaging unit; the first imaging unit of the imaging structure of row i and column j is connected with the first signal line of row 2i-1 and the second signal line of column 2j-1 respectively, and the second imaging unit of the imaging structure of row i and column j is connected with the first signal line of row 2i and the second signal line of column 2j respectively.