Under-screen Fingerprint Array Segmentation for Narrow Border Displays
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Solution Overview
Problem
Existing under-screen fingerprint identification technologies with larger unlocking areas increase the number of fingerprint sensors and channels, leading to a larger display module border, which is not conducive to narrow border designs.
Innovation Solution
A fingerprint identification method using a display module with a fingerprint sensing array composed of multi-row and multi-column fingerprint identification units, where output terminals of the same column are electrically connected to form multiple testing channels, reducing the number of channels and border size, and including a driving chip for acquiring and processing touch information to unlock the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fingerprint unlockable area is increased to allow larger areas (half-screen, full-screen), then user convenience and experience are improved, but the number of fingerprint sensors and channels increases, leading to a larger display module border
Solution Approach 1:
The fingerprint sensing array is divided into multiple fingerprint identification arrays arranged in a matrix, where each array can be independently controlled. This segmentation allows the system to activate only the necessary sensing arrays based on touch position, enabling large unlockable areas while keeping the actual active sensing regions compact and reducing the required border size.
Solution Approach 2:
The system dynamically activates specific fingerprint identification arrays based on the detected touch position. When a user touches the screen, the system determines which array contains the touch point and activates only that array for fingerprint sensing. This dynamic activation allows the unlockable area to cover the entire screen while maintaining a compact physical sensor structure with reduced border requirements.
2Area of stationary object
If the number of fingerprint sensors is increased to cover larger areas, then the fingerprint unlockable area is improved, but the number of channels (connections with driver chips) increases, leading to a larger display module border
Solution Approach 1:
Multiple fingerprint identification arrays are merged into a single integrated sensing system sharing common drive lines and signal lines. The arrays are connected in a matrix configuration where row and column lines are shared across multiple arrays, allowing the system to control and read from multiple sensors using a reduced number of channels compared to having independent connections for each sensor.
Solution Approach 2:
The drive lines and signal lines serve multiple functions and multiple fingerprint identification arrays simultaneously. A single drive line can activate multiple arrays at different times, and signal lines carry data from multiple arrays through time-division or spatial-division multiplexing. This multi-functionality reduces the total number of channels required while maintaining the capability to sense across large areas.
Data Source
AI summary
The present invention provides a fingerprint identification method, an electronic device and a display panel. The method includes: acquiring a center position information of a geometric center position of the touch operation getting a touch information of the touch operation; determining whether the center position information is the same as the geometric center position of one of the fingerprint identification arrays; getting a fingerprint image data according to a judgment result and the touch information; and unlocking the screen when the fingerprint image data is consistent with a preset fingerprint data.