Dual Memory Display Driver for Biometric Sensing Speed
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Solution Overview
Problem
Fingerprint authentication in electronic devices can be delayed by background processes and other tasks, necessitating a method to quickly and efficiently perform biometric image sensing.
Innovation Solution
An electronic device with a biometric image sensor and display driver that alternately reads and writes illumination pattern data between two memories to drive an LED display during biometric image sensing, allowing for simultaneous and efficient acquisition of optical image data under different lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single memory is used to store illumination pattern data for the display driver, then the device complexity is reduced, but the authentication speed is slowed due to sequential read/write operations
Solution Approach 1:
The patent divides the memory system into two separate memories (first memory and second memory) to enable parallel operations. While the processor reads illumination pattern data from the first memory to drive the display, the device processor simultaneously writes updated illumination pattern data to the second memory, eliminating sequential wait times and improving authentication speed.
Solution Approach 2:
The device processor performs preliminary writing of illumination pattern data to the second memory before the main processor needs to read it. This advance preparation ensures that data is ready when needed, preventing delays in the authentication process and enabling continuous operation without waiting for data preparation.
2Productivity
If background processes are allowed to run during fingerprint authentication, then device productivity is maintained, but authentication time increases
Solution Approach 1:
The patent implements continuous operation by having the processor continuously read from the first memory while the device processor continuously writes to the second memory. This parallel continuous operation ensures that display driving and data preparation occur simultaneously without interruption, maintaining high productivity while eliminating authentication delays.
Solution Approach 2:
The device processor performs preliminary writing of illumination pattern data to the second memory in advance, so that when authentication is initiated, the data is already prepared and available. This eliminates waiting time during authentication while allowing other device operations to continue uninterrupted.
3Measurement precision
If illumination pattern data is updated during display driving, then the quality of biometric image sensing is improved, but data integrity may be compromised
Solution Approach 1:
The patent segments the data storage into two separate memories, allowing one memory to be read while the other is written without interference. This physical separation ensures data integrity during updates, as the processor reading from the first memory cannot be affected by writes to the second memory, while still enabling high-quality biometric imaging through updated illumination patterns.
Solution Approach 2:
The second memory acts as an intermediary buffer between the device processor and the display driver. The device processor writes updated illumination pattern data to the second memory, which then serves as a safe staging area before the data becomes active, ensuring that updates do not corrupt the data currently being read by the processor.
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 enables rapid and efficient biometric image sensing, reducing authentication delays and improving the quality of fingerprint data acquisition by alternating illumination patterns, thus enhancing the speed and accuracy of biometric authentication.
Implementation Method 1
The display may include a light emitting diode (LED) display
Data Source
AI summary
An electronic device may include a display and a biometric image sensor configured for biometric image sensing. The electronic device may also include a display driver coupled to the display. The display driver may include first and second memories and a processor configured to alternatingly read respective illumination pattern data from the first and second memories to drive the display during biometric image sensing.