Fingerprint Identification Panel Voltage Stabilization
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Solution Overview
Problem
Current electronic devices with fingerprint identification technology face challenges in improving the accuracy of fingerprint identification due to interference between display driving operations and fingerprint identification operations, particularly due to voltage effects on data lines.
Innovation Solution
A method that divides the display frame into display driving periods and fingerprint identification periods, with a predetermined DC voltage set on transmission lines before fingerprint identification, allowing for selective connection of transmission lines between display and fingerprint sensing pixels to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If display driving operation and fingerprint identification operation share the same transmission lines, then device complexity is reduced, but fingerprint identification accuracy deteriorates due to voltage interference
Solution Approach 1:
The transmission lines are segmented into two distinct groups: a first set of transmission lines dedicated to display driving operations and a second set of transmission lines dedicated to fingerprint identification operations. This physical separation eliminates voltage interference between the two functions while maintaining a relatively simple overall device structure. The segmentation allows each transmission line set to operate independently without mutual interference.
Solution Approach 2:
The patent merges the display panel and fingerprint sensing panel into a single integrated panel structure, where both display pixels and fingerprint sensing pixels are arranged on the same substrate and share common structural elements such as the encapsulation layer and substrate. This merging reduces device complexity by eliminating the need for separate transmission lines and independent panel structures, while the electrical isolation through different transmission line sets prevents interference.
2Area of stationary object
If fingerprint sensing pixels are arranged in the entire panel region, then fingerprint identification coverage is improved, but interference between display and fingerprint operations increases
Solution Approach 1:
The panel is segmented into distinct functional regions: a display region containing display pixels and a fingerprint sensing region containing fingerprint sensing pixels. The first set of transmission lines is connected to display pixels in the display region, while the second set of transmission lines is connected to fingerprint sensing pixels in the fingerprint sensing region. This spatial and electrical segmentation allows full-screen fingerprint coverage while preventing operation interference through dedicated transmission paths.
3Ease of manufacture
If transmission lines are used for both display data writing and fingerprint signal reading, then manufacturing simplicity is improved, but voltage stability during fingerprint identification deteriorates
Solution Approach 1:
The transmission lines are segmented into two independent sets with distinct functions. The first set of transmission lines is exclusively used for writing display data during display driving operations, while the second set of transmission lines is exclusively used for reading fingerprint identification signals. This segmentation ensures voltage stability for fingerprint identification by preventing display driving voltages from interfering with fingerprint sensing signals, while still maintaining manufacturing simplicity through the integrated panel structure.
Data Source
AI summary
Provided are a fingerprint identification method for a panel, an electronic device and a control circuit. The method includes setting voltages on the data lines and sensing lines that may affect a fingerprint identification result to a predetermined DC voltage during a predetermined time period before a start of a fingerprint identification period that follows a display driving period. As such, when a display driving operation and a fingerprint identification operation are performed in a time-division manner, the influence of the display driving operation on the fingerprint identification operation can be eliminated, that is, the influence on the fingerprint identification result from the voltage on the data line and sensing line can be eliminated.