Interleaved Touch and Fingerprint Signal Lines for Under-Display Integration
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Solution Overview
Problem
As touch screens on mobile devices become larger, the space available for fingerprint sensing elements under the display becomes restricted, making it challenging to integrate effective touch and fingerprint recognition functions without compromising display quality.
Innovation Solution
The electronic device incorporates a fingerprint sensing array with interleaved touch driving lines and fingerprint sensing signal readout lines, utilizing capacitance changes to detect touch events and improve touch sensing performance while reducing the layout area required for touch elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fingerprint sensing elements are disposed under the touch screen to enable under-screen fingerprint recognition, then users can perform both touch operation and fingerprint recognition in the touch display zone, but the space available for fingerprint sensing elements becomes restricted as the touch screen becomes larger
Solution Approach 1:
The patent combines touch driving lines and fingerprint sensing signal readout lines into a single set of signal lines that serve dual purposes. The same signal lines are used for both touch sensing (by detecting capacitance changes between interleaved lines) and fingerprint recognition (by reading signals from fingerprint sensing units), thereby eliminating the need for separate dedicated lines and reducing the layout area required under the display.
Solution Approach 2:
The signal lines are designed to perform multiple functions: they serve as both touch driving lines for capacitive touch sensing and as fingerprint sensing signal readout lines for under-screen fingerprint recognition. This multi-functionality allows the system to maintain both touch and fingerprint capabilities while minimizing the space required for signal routing under the display.
2Area of moving object
If touch elements are disposed under the display to enable under-screen touch sensing, then the display area can be maximized, but the area required for touch elements increases under the display
Solution Approach 1:
The patent merges touch sensing functionality into the existing fingerprint sensing signal readout lines by utilizing capacitance changes between interleaved touch driving lines and fingerprint readout lines. This integration eliminates the need for separate touch electrode arrays under the display, thereby maximizing the display area while maintaining touch sensing capability.
Solution Approach 2:
The patent replaces traditional mechanical touch electrode structures with a capacitive sensing mechanism that utilizes the electromagnetic field between interleaved signal lines. This substitution allows touch sensing to be achieved without requiring physical touch elements under the display, thus maximizing the display area.
3Reliability
If separate touch driving lines and fingerprint sensing lines are used, then touch and fingerprint functions can be independently optimized, but the device complexity and layout area increase
Solution Approach 1:
The patent combines touch driving lines and fingerprint sensing lines into a single interleaved structure where the same physical lines serve both functions. This merging reduces the total number of signal lines required while maintaining the ability to independently process touch and fingerprint signals through different reading modes of the same hardware infrastructure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances touch detection accuracy and reduces the area needed for touch elements, allowing for simultaneous touch and fingerprint recognition operations without affecting the display, thereby improving user experience.
Implementation Method 1
detect a touch event by sensing a capacitance change between the touch driving lines and the fingerprint sensing signal readout lines
Data Source
AI summary
An electronic device with fingerprint sensing function including a fingerprint sensing array, multiple fingerprint sensing signal readout lines, multiple touch driving lines, a touch driving circuit, and a read circuit is provided. The fingerprint sensing array includes multiple fingerprint sensing units arranged in array. The fingerprint sensing signal readout lines are respectively coupled to a column of fingerprint sensing units of the fingerprint sensing array. The touch driving lines are respectively interleaved with the fingerprint sensing signal readout lines. The touch driving circuit is coupled to the touch driving lines, and provides multiple touch driving signals to the touch driving lines. The read circuit is coupled to the fingerprint sensing signal readout lines. In response to the touch driving lines outputting the touch driving signals, the read circuit determines a touch position of a touch object based on multiple read signals output by the fingerprint sensing signal readout lines.