Sensing Device Skip Scan Mode for Faster Fingerprint Acquisition
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Solution Overview
Problem
Current scanning devices, such as fingerprint scanners, operate at insufficient speeds, necessitating a solution to enhance scan operation efficiency.
Innovation Solution
A sensing device with a signal source and driving units that operate in multiple modes, including a skip scan and jump scan mode, where specific voltage levels control the activation of rows in the active area, allowing for the skipping or jumping of rows to accelerate the scanning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all rows in the active area are sequentially scanned, then complete sensing coverage is achieved, but scan operation speed is reduced
Solution Approach 1:
The active area is divided into multiple rows that can be independently controlled. The driving units selectively activate specific rows based on operating mode, allowing the scanning process to be segmented into essential rows that need sensing versus rows that can be skipped, thereby improving scan speed while maintaining necessary coverage
Solution Approach 2:
The scanning system dynamically adjusts its operation between different modes (first operating mode with full row scanning for complete coverage, second operating mode with selective row skipping for speed). This dynamic adaptability allows the system to optimize between sensing completeness and scan speed based on operational requirements
2Speed
If multiple operating modes are implemented, then scan speed is improved through selective row activation, but device complexity increases
Solution Approach 1:
The driving units are designed with multi-functionality to support both first operating mode (complete scanning) and second operating mode (selective scanning). This universal design allows a single hardware structure to perform multiple scanning functions, reducing the need for separate dedicated circuits for each mode and thereby limiting the increase in device complexity
Solution Approach 2:
The system changes operational parameters (voltage levels applied to driving units) to switch between operating modes. By using parameter changes rather than structural modifications, the system can achieve multiple scanning modes with minimal increase in hardware complexity, as the same physical components operate under different electrical conditions
Data Source
AI summary
A sensing device may include a signal source, an active area and a plurality of driving units. The active area having a plurality of sensing units. The plurality of driving units sequentially disposed adjacent to the active area and coupled to the plurality of sensing units and the signal source. The signal source provides a first operating mode and a second operating mode. In the first operating mode, a scan signal exported from one of the plurality of driving units has a first voltage level and a second voltage level. In the second operating mode, the scan signal has the second voltage level.