Pre-configuration Module for Signal Reading Lines in Ultrasonic Fingerprint Detection
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Solution Overview
Problem
Ultrasonic fingerprint recognition systems face significant noise interference during detection, which negatively impacts accuracy, particularly due to voltage changes on signal reading lines when demultiplexing switches are activated.
Innovation Solution
Incorporating a pre-configuration module that outputs a preset signal to signal reading lines before detection, reducing noise by stabilizing potentials and minimizing the effect of switch activation on these lines, thereby enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If demultiplexing switches are activated to read detection signals, then signal reading is enabled, but voltage changes on signal reading lines introduce noise that deteriorates detection accuracy
Solution Approach 1:
The patent applies preliminary action by configuring the potential of signal reading lines to a predetermined voltage level before demultiplexing switches are activated. This pre-configuration ensures that when switches turn on, minimal voltage fluctuation occurs on the reading lines, thereby reducing noise injection and maintaining detection accuracy while enabling signal reading.
2Device complexity
If multiple driving circuits share a common signal reading line, then device complexity is reduced, but switching between circuits causes potential instability and noise
Solution Approach 1:
Before each driving circuit outputs a detection signal through the shared reading line, the system preliminarily configures the reading line's potential to a predetermined level. This pre-configuration stabilizes the line's electrical state, preventing potential fluctuations and noise when switches between different driving circuits are activated, thus maintaining signal reliability while enabling circuit sharing.
Data Source
AI summary
A detection circuit, a method for driving the same, and a display device are provided. In an embodiment, the detection circuit includes driving circuits, signal reading lines, and a pre-configuration module. In an embodiment, one of the signal reading lines is coupled to at least two of the driving circuits. In an embodiment, the pre-configuration module is coupled to the signal reading lines, and configured to output a preset signal to the signal reading lines to pre-configure potentials on the signal reading lines.