Haptic Feedback Control for Touchscreen Fingerprint Sensor Alignment
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Solution Overview
Problem
Computing devices with fingerprint sensors face challenges in assisting users to accurately place their fingers due to obscured visibility, making it difficult to align the finger with the sensor without visual cues.
Innovation Solution
The implementation of a method that uses haptic feedback based on the proximity of the finger to the fingerprint sensor, increasing feedback as the finger approaches and reducing it when aligned, by determining the measured distance and adjusting frictional forces or vibrations accordingly, to guide the user's placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fingerprint sensor is placed on the touchscreen display, then the device can perform biometric authentication, but the user's view of the sensor is obscured making it difficult to place the finger in the correct location
Solution Approach 1:
The system provides haptic feedback through the display that changes based on the proximity of the finger to the sensor. As the finger approaches the sensor, the haptic feedback intensity increases, creating a tactile signal that guides the user to the correct placement location. This feedback mechanism resolves the contradiction by providing real-time guidance without requiring visual observation of the sensor.
Solution Approach 2:
The patent introduces haptic feedback as an intermediary between the user and the sensor. Instead of relying on direct visual observation (which is blocked), the system uses tactile signals as a mediator to communicate the finger's proximity to the sensor and guide proper placement, thus resolving the visibility obstruction problem.
2Ease of operation
If haptic feedback is increased to guide finger placement, then ease of operation improves, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The display serves multiple functions: it displays visual content, detects touch input, and provides haptic feedback. By utilizing the existing display structure for haptic feedback through electrostatic or capacitive mechanisms, the system avoids adding separate dedicated haptic hardware, thus improving ease of operation while minimizing the increase in device complexity.
Solution Approach 2:
The system uses the user's own finger as part of the haptic feedback mechanism. The finger's proximity and contact with the display create the haptic sensation itself, eliminating the need for complex external actuators or mechanical components. The finger essentially serves itself as both the input tool and the feedback receiver.
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 users to accurately position their fingers on the fingerprint sensor without visual cues, enhancing the usability and accuracy of biometric authentication by providing tactile feedback that simulates the sensation of moving up a slope and then falling into place.
Implementation Method 1
causing the haptics layer to generate a frictional force as a function of the measured distance
Data Source
AI summary
A method can include determining that a measured distance, of an object in contact with a touchscreen, from a sensor included in the touchscreen, is less than or equal to a first distance and equal to or greater than a second distance, based on determining that the measured distance of the object from the sensor is less than or equal to the first distance and equal to or greater than the second distance, providing haptic feedback as a function of the measured distance, the haptic feedback being greater for smaller measured distances; determining that the measured distance is less than the second distance; and in response to determining that the measured distance is less than the second distance, decreasing the haptic feedback.