Fingerprint Sensing Driver Slew Rate and Offset Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fingerprint sensing technologies face challenges in efficiently capturing high-quality fingerprint images due to noise interference and the need for multi-cycle averaging, which prolongs processing time and affects user experience, while also experiencing issues with charge injection and dynamic offset adjustments in fingerprint sensing drivers or chips.
Innovation Solution
The implementation of a fingerprint sensing driver or chip that provides pre-scanned fingerprint patterns to applications, adjusts signal slew rates to reduce charge injection, and dynamically adjusts offsets to enhance image quality and processing efficiency, including mechanisms for multi-cycle averaging, slew rate control, and dynamic offset compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-cycle averaging is performed to reduce noise interference, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent implements pre-scanning functionality that captures and processes fingerprint data before the actual authentication is needed. The fingerprint sensing driver performs preliminary fingerprint pattern acquisition and stores it in advance, so when authentication is required, the preprocessed data can be immediately used, eliminating the need for time-consuming multi-cycle averaging during actual authentication operations.
2Productivity
If signal slew rate is increased to improve processing speed, then productivity is improved, but object-generated harmful factors increase due to charge injection
Solution Approach 1:
The patent implements dynamic slew rate adjustment mechanisms that modify the signal transition characteristics based on operational requirements. The fingerprint sensing driver can adjust the slew rate parameter of control signals to optimize the balance between processing speed and charge injection effects, using faster slew rates when speed is critical and slower slew rates when accuracy is prioritized, thereby dynamically managing the trade-off between productivity and harmful charge injection.
3Measurement precision
If dynamic offset adjustment is implemented to enhance image quality, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent implements self-calibration and automatic offset compensation mechanisms within the fingerprint sensing driver. The system automatically detects and corrects offset errors in the sensing circuitry without requiring external calibration equipment or complex manual adjustment mechanisms. The driver performs self-diagnosis and self-correction of offset drift, maintaining high measurement precision while minimizing the added complexity through automated self-service functionality.
Data Source
AI summary
Various aspects or embodiments of fingerprint sensing are described, for use in fingerprint sensing, for example, over a portion or whole of a screen of a computing device, such as smart phones, tablet computers or other information processing devices. An electronic module, computing apparatus, and a panel are provided. The electronic module includes a slew rate configuring circuit to generate and transmit at least one output signal to a gate on array (GOA) circuit of the panel; and a fingerprint sensing control circuit, coupled to fingerprint sensing elements of the panel, to generate and transmit control signals to the GOA circuit, wherein the fingerprint sensing control circuit controls the GOA circuit to generate reset signals according to the at least one output signal to reset the fingerprint sensing elements respectively and the slew rate configuring circuit controls a slew rate of a falling edge of each reset signal.