Touch Substrate Electrode Grouping for Narrow Border Fingerprint Display
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Solution Overview
Problem
Current fingerprint determination technologies require thousands of signal lines outside the display region, which interfere with the aperture ratio and border size of display screens, making it difficult to achieve full-screen fingerprint determination efficiently.
Innovation Solution
A touch substrate with touch driving electrodes and sensing electrodes divided into non-overlapping regions, where each set of electrodes is connected to a shared signal line, reducing the number of signal lines and allowing for effective fingerprint determination across the display region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional fingerprint determination technology is used with individual signal lines for each electrode, then fingerprint determination accuracy is maintained, but the number of signal lines increases significantly, reducing the aperture ratio and increasing border size
Solution Approach 1:
The patent merges multiple touch driving electrodes into groups, where each group shares a common signal line. Similarly, multiple touch sensing electrodes are grouped with shared signal lines. This consolidation reduces the total number of signal lines from thousands to a manageable number, directly improving the aperture ratio by eliminating the need for numerous individual signal lines outside the display region.
Solution Approach 2:
The patent segments the touch electrode array into multiple groups along the first and second directions. By dividing the electrodes into discrete groups that can be independently controlled through shared signal lines, the system maintains functional independence while reducing signal line requirements. Each group acts as a functional unit that preserves detection capability despite sharing infrastructure with other groups.
2Quantity of substance
If traditional fingerprint determination technology is used with individual signal lines for each electrode, then fingerprint determination accuracy is maintained, but the border size increases
Solution Approach 1:
By combining multiple electrodes into groups that share common signal lines, the patent dramatically reduces the number of signal lines that must be routed outside the display region. This consolidation allows the border size to be minimized, as fewer signal lines require less external routing space, enabling the achievement of narrow border designs.
3Area of stationary object
If the number of signal lines is reduced through electrode grouping, then aperture ratio is improved, but electrode arrangement complexity increases
Solution Approach 1:
The patent organizes electrodes into systematic groups along the first and second directions, creating a structured arrangement that simplifies the overall design. Each group is defined by clear spatial relationships and shared signal line assignments, making the complexity manageable through regular patterns rather than arbitrary configurations.
Solution Approach 2:
The patent designs the electrode groups and shared signal lines to serve multiple functions: touch detection, fingerprint determination, and signal routing efficiency. This multi-functionality reduces the need for dedicated components for each function, simplifying the overall device architecture despite the electrode grouping complexity.
4Measurement precision
If electrode pitch is optimized for fingerprint determination, then fingerprint accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
By grouping electrodes and using shared signal lines, the patent creates larger functional units that are more tolerant of manufacturing variations. The grouping approach allows for optimized pitch within groups while maintaining overall system performance, as the shared signal lines provide signal stability that compensates for minor pitch variations between groups.
Data Source
AI summary
A touch substrate and its manufacturing method thereof, a display device, a fingerprint determination device and a method for determining a fingerprint are provided. The touch substrate touch driving electrodes, touch sensing electrodes and signal lines on a base substrate which at least includes a first region and a second region. The plurality of touch driving electrodes include a plurality of first touch driving electrodes in the first region and a plurality of second touch driving electrodes in the second region, and each first touch driving electrode and one second touch driving electrode are connected with a same signal line; and/or the plurality of touch sensing electrodes include a plurality of first touch sensing electrodes in the first region and a plurality of second touch sensing electrodes in the second region, and each first touch sensing electrode and one second touch sensing electrode are connected with a same signal line.