Fingerprint Sensing Chip GPIO Control for In-Display Signal Interference
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Solution Overview
Problem
In-display fingerprint recognition technologies face challenges in achieving optimal touch and fingerprint sensing performance due to signal interference between touch sensing and fingerprint sensing operations, necessitating a method to enhance communication speed and quality of fingerprint sensing.
Innovation Solution
A fingerprint sensing device and operation method that utilize a fingerprint sensing chip coupled to a driver integrated chip via a GPIO interface to control touch sensing, disabling it during fingerprint sensing periods to prevent interference and improve sensing quality, thereby enabling quicker fingerprint sensing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch sensing is enabled during fingerprint sensing, then touch display performance is maintained, but signal interference degrades fingerprint sensing quality
Solution Approach 1:
The patent extracts the touch sensing function from the driver integrated chip during fingerprint sensing operations by disabling it through control signals. This separation allows fingerprint sensing to occur without interference from touch sensing signals, thereby improving fingerprint sensing quality while maintaining touch functionality when needed.
Solution Approach 2:
The system dynamically switches the state of touch sensing based on the operational mode. During fingerprint sensing, touch sensing is disabled; during normal operation, touch sensing is enabled. This dynamic adjustment optimizes system performance for the current operational context and eliminates signal interference during critical fingerprint capture.
2Productivity
If traditional communication interface is used between fingerprint sensing chip and driver integrated chip, then system complexity is reduced, but communication speed limits fingerprint sensing speed
Solution Approach 1:
The patent changes the communication interface parameters by using GPIO interface with direct control signal capability instead of traditional slower interfaces. This parameter change enables faster communication between the fingerprint sensing chip and driver integrated chip, directly improving fingerprint sensing speed and overall system productivity.
3Speed
If fingerprint sensing chip directly controls driver integrated chip via GPIO interface, then communication speed increases, but device complexity increases
Solution Approach 1:
The GPIO interface serves multiple functions: it transmits control signals from the fingerprint sensing chip to the driver integrated chip, enables direct communication for fast response, and integrates seamlessly with existing display control infrastructure. This multi-functionality achieves high-speed communication without significantly increasing overall system complexity.
Data Source
AI summary
A fingerprint sensing device and an operation method thereof are provided. The fingerprint sensing device includes a fingerprint sensor, a driver integrated chip, and a fingerprint sensing chip. The fingerprint sensing chip is coupled to the fingerprint sensor, and is coupled to the driver integrated chip via a general purpose input/output (GPIO) interface. The fingerprint sensing chip provides a control signal to the driver integrated chip via the GPIO interface to control the driver integrated chip according to the control signal to disable touch sensing during a fingerprint sensing period. The fingerprint sensing chip drives the fingerprint sensor to obtain a fingerprint image during the fingerprint sensing period.