Combined Fingerprint Touch Screen Dual-Phase Scanning
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Solution Overview
Problem
Conventional fingerprint recognition devices require separate components for fingerprint authentication and touch sensing, which increases complexity and reduces efficiency, especially in mobile devices where space is limited.
Innovation Solution
A combined fingerprint recognition touch screen device with intersecting driving and sensing lines, a driver, and a controller that performs primary and secondary scanning to determine the scanning region based on touch input, allowing for both fingerprint recognition and touch sensing on a single display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate fingerprint recognition device and touch screen device are used, then fingerprint recognition function is provided, but device complexity increases and space is occupied
Solution Approach 1:
The patent combines fingerprint recognition functionality with touch screen functionality by integrating a fingerprint sensor layer with the touch screen structure. The touch screen includes a substrate, a touch sensing layer, and a fingerprint sensor layer that shares the same display area, allowing both touch sensing and fingerprint recognition to occur through the same physical interface rather than requiring separate devices.
Solution Approach 2:
The display panel is designed to serve multiple functions simultaneously: it acts as both the touch screen interface for general touch operations and as the fingerprint sensor for biometric authentication. The sensing lines and driving lines are configured to detect both light touch inputs and the pressure/condensation patterns characteristic of fingerprint placement, enabling one component to fulfill multiple authentication and input roles.
2Adaptability or versatility
If separate fingerprint recognition device and touch screen device are used, then fingerprint recognition function is provided, but space is occupied
Solution Approach 1:
The fingerprint sensor is integrated within the touch screen structure by stacking the fingerprint sensing layer above the touch sensing layer on the same substrate. This vertical integration allows both functions to occupy the same physical footprint on the device front surface, eliminating the need for additional space that would be required for a separate fingerprint sensor component.
Solution Approach 2:
The fingerprint sensor functionality is nested within the touch screen structure. The fingerprint sensing elements are positioned within the same physical boundaries as the touch screen, with the fingerprint sensor layer effectively embedded in the multi-layer construction of the touch display assembly, allowing one function to be contained within another.
3Measurement precision
If conventional scanning method is used, then scanning is performed, but scanning time is long
Solution Approach 1:
The scanning process is divided into two distinct phases: a first scanning mode that quickly scans the entire display area using a reduced set of driving lines to identify potential fingerprint regions, and a second scanning mode that performs detailed scanning only in the identified fingerprint regions using all driving lines. This segmentation of the scanning process into coarse and fine phases reduces overall scanning time while maintaining fingerprint recognition accuracy.
Solution Approach 2:
The first scanning mode performs a preliminary scan of the entire display area before the second scanning mode begins. This preliminary action identifies which regions contain fingerprints, allowing the second scanning mode to focus computational resources and scanning efforts only on relevant areas, thereby reducing total scanning time without compromising detection accuracy.
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 solution enables efficient and rapid fingerprint recognition by reducing the time required for scanning and eliminating the need for separate fingerprint sensors, enhancing user authentication and touch sensing capabilities in compact electronic devices.
Implementation Method 1
a touch pad including driving lines and sensing lines intersecting the driving lines
Data Source
AI summary
A touch screen device includes a touch pad including driving lines and sensing lines intersecting the driving lines, a driver configured to apply a driving signal to the driving lines, a signal output collector configured to receive a touch signal from the sensing lines, and a controller configured to control the driver and the signal output collector. The controller is further configured to control the driver to perform primary scanning to sequentially apply the driving signal to first driving lines disposed at predetermined intervals, among the driving lines, determine a scanning region, based on a first driving line where a touch is sensed among the first driving lines to which the driving signal is applied, and control the driver to perform secondary scanning to sequentially apply the driving signal to second driving lines included in the determined scanning region, among the driving lines.