Fingerprint Sensing Panel Driving Method for Early Unlocking
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Solution Overview
Problem
Existing fingerprint sensing devices experience longer unlocking times due to the delay in switching from a normal brightness mode to a high brightness mode, which necessitates waiting for the high brightness mode to be ready before capturing fingerprints.
Innovation Solution
A driving method for a fingerprint sensing panel that detects finger touch and switches to a high brightness mode during touch, allowing fingerprint sensing to occur before the mode switching time point, with a first reset before and sampling after this point to facilitate early fingerprint sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the brightness mode is switched from normal brightness mode to high brightness mode after finger touch, then the fingerprint sensing quality is improved, but the unlocking time is increased
Solution Approach 1:
The patent initiates the fingerprint sensing operation before the brightness mode switching is complete. Specifically, the sensing operation starts during the transition period from normal to high brightness mode, rather than waiting for the mode switch to finish. This preliminary action reduces the waiting time and shortens the overall unlocking time while still maintaining fingerprint sensing quality.
2Measurement precision
If the fingerprint sensing is performed after the high brightness mode is ready, then the sensing accuracy is ensured, but the image capturing time is extended
Solution Approach 1:
The patent performs the fingerprint sensing operation in advance during the brightness mode transition period. The sensing operation is initiated before the high brightness mode is fully established, which reduces the image capturing time while the system ensures sufficient brightness for accurate sensing by the time the operation completes.
3Reliability
If the system waits for the brightness mode switching to complete before starting fingerprint sensing, then the sensing reliability is improved, but the overall processing time is increased
Solution Approach 1:
The patent starts the fingerprint sensing operation during the brightness mode transition rather than waiting for it to complete. This preliminary action reduces processing time while the system maintains sensing reliability by ensuring the brightness level is sufficient for accurate fingerprint capture by the time the sensing operation finishes.
Data Source
AI summary
A fingerprint sensing device and a driving method for a fingerprint sensing panel thereof are provided. The driving method includes: detecting whether a finger touch occurs on the fingerprint sensing panel; during a period of the finger touch, switching the brightness mode of the fingerprint sensing panel from a normal brightness mode to a high brightness mode so as to sense a fingerprint; driving the fingerprint sensing panel to sense the fingerprint before a mode switching time point at which the brightness mode of the fingerprint sensing panel is switched to the high brightness mode. The fingerprint sensing panel includes a pixel row, wherein the pixel row is subjected to a reset, an exposure period and a sampling in sequence to output a row sensing result, the reset is earlier than the mode switching time point, and the sampling is later than the mode switching time point.