Touch Display Fingerprint Sensing Signal Interference Compensation
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Solution Overview
Problem
The integration of fingerprint sensing into touch display panels often compromises the quality of analog touch sensing signals due to the fingerprint sensor occupying space on the conductive layer or interfering with touch sensing electrodes, reducing sensitivity.
Innovation Solution
A driving device and method that utilize part of the fingerprint sensor array's conductive circuitry as auxiliary touch sensing electrodes, performing a second touch sensing operation to compensate for the first touch sensing results, ensuring non-overlapping time for touch and fingerprint sensing operations to improve sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fingerprint sensor is embedded in the touch display panel, then the fingerprint sensing function is achieved, but the quality of touch sensing signals deteriorates due to occupied conductive layer space and signal interference
Solution Approach 1:
The sensing functions are segmented into separate time periods: touch sensing operations occur in first and second time periods, while fingerprint sensing operations occur in a third time period. This temporal segmentation eliminates signal interference between the two functions while maintaining both capabilities in the integrated display panel.
Solution Approach 2:
The conductive circuitry of the fingerprint sensor array is dynamically reassigned: during the third time period it serves fingerprint sensing, while during the first and second time periods it functions as second touch sensing electrodes. This dynamic functional switching resolves the conflict between the two sensing modes.
2Adaptability or versatility
If the fingerprint sensor occupies part of the conductive layer, then the fingerprint sensing function is implemented, but the area of touch sensing electrodes is reduced
Solution Approach 1:
The conductive circuitry of the fingerprint sensor array serves multiple functions: it acts as fingerprint sensing electrodes during fingerprint sensing operations and as auxiliary touch sensing electrodes during touch sensing operations. This multi-functionality compensates for the reduced area of primary touch sensing electrodes.
Solution Approach 2:
The functional role of the fingerprint sensor's conductive circuitry changes dynamically based on the operational mode, switching between fingerprint sensing and touch sensing functions at different time periods, thereby maximizing the utilization of available conductive structures.
3Adaptability or versatility
If the fingerprint sensor and touch sensing electrode are placed close together, then the in-display fingerprint sensing is achieved, but signal interference occurs between the two devices
Solution Approach 1:
The sensing operations are performed in periodic, non-overlapping time periods: touch sensing in first and second periods, fingerprint sensing in a third period. This periodic separation prevents simultaneous signal acquisition that would cause interference, while maintaining close physical proximity for in-display functionality.
Solution Approach 2:
The sensing operations are segmented into distinct time periods to separate the signal acquisition processes spatially in time, eliminating mutual interference between touch and fingerprint sensing while maintaining their integrated structure.
Data Source
AI summary
A driving device for driving a touch display panel with fingerprint sensing function and a driving method therefore are provided. The circuit includes a plurality of touch sensing input terminals, a plurality of fingerprint sensing input terminals, a first touch sensing circuit, a fingerprint sensing circuit, and a second touch sensing circuit. The second touch sensing circuit is coupled to a plurality of second touch sensing electrodes in a fingerprint sensor array of the touch display panel through at least a part of the plurality of fingerprint sensing input terminals. The second touch sensing circuit is configured to perform the second touch sensing operation according to the second touch sensing electrodes in the fingerprint sensor array for compensating a touch sensing result of the first touch sensing operation by the first touch sensing circuit.