Touch Coordinate Calculation Using Fingerprint Sensor Data
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Solution Overview
Problem
Fingerprint sensors disposed on display panels can interfere with touch input recognition due to their wirings and shield members, causing inaccuracies in determining touch coordinates, especially when inputs occur on the periphery of the fingerprint sensor's inactive area.
Innovation Solution
An electronic device with both a touch sensor and a fingerprint sensor on a display panel uses a processor to calculate touch input coordinates by combining data from both sensors, even when the input falls on the inactive area of the fingerprint sensor, ensuring accurate touch input recognition across the entire display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fingerprint sensor is disposed on the display panel, then biometric recognition capability is improved, but touch input recognition accuracy deteriorates due to interference from wirings and shield members
Solution Approach 1:
The display panel is divided into multiple sensing zones: a first sensing area where only the touch sensor operates, and a second sensing area where both the touch sensor and fingerprint sensor operate. This segmentation allows the system to handle touch inputs differently depending on their location, thereby maintaining touch recognition accuracy while preserving biometric recognition capability.
Solution Approach 2:
The processor acts as an intermediary that receives sensing results from both the touch sensor and fingerprint sensor, determines whether a touch input occurs in the first or second sensing area, and selectively processes the touch coordinate data accordingly. This mediation enables the system to resolve the interference between the two sensors through intelligent data processing.
2Adaptability or versatility
If the fingerprint sensor is disposed on the display panel, then device functionality is improved, but touch coordinate determination accuracy deteriorates in the periphery area
Solution Approach 1:
Different quality standards are applied to different areas of the display panel. In the first sensing area, full touch sensor functionality is utilized for high-precision touch coordinate determination. In the second sensing area, the system adapts to the presence of the fingerprint sensor by using combined sensing data, thereby maintaining acceptable accuracy while enabling enhanced device functionality.
3Area of stationary object
If both touch sensor and fingerprint sensor are disposed on the display panel, then sensing coverage is improved, but interference between sensors increases
Solution Approach 1:
The system dynamically adjusts its sensing strategy based on the location of the touch input. When a touch occurs in the first sensing area, the system uses only the touch sensor data. When a touch occurs in the second sensing area, the system combines data from both sensors and applies interference compensation. This dynamic adaptation minimizes sensor interference while maintaining comprehensive sensing coverage.
Data Source
AI summary
An electronic device includes a cover glass, a touch sensor disposed under the cover glass and sensing proximity of or contact by an external object, a touch integrated circuit (IC) electrically connected to the touch sensor, a fingerprint sensor disposed under the cover glass adjacent to the touch sensor, including an active area for sensing a biometric pattern of the external object and an inactive area surrounding a periphery of the active area, a fingerprint IC electrically connected to the fingerprint sensor, and a processor electrically connected to the touch IC and the fingerprint IC. The processor is configured, if an input by the external object is sensed by both the touch sensor and the fingerprint sensor, to calculate coordinates of the input based on at least part of data sensed by the touch sensor and data sensed by the fingerprint sensor.