Integrated Fingerprint Touch Screen Noise Shielding
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Solution Overview
Problem
Existing touch screen devices face challenges in integrating fingerprint recognition with touch sensing, often requiring separate modules and suffering from noise interference that degrades signal quality and overall performance.
Innovation Solution
A fingerprint recognizable touch screen apparatus is designed with a fingerprint sensor and touch sensor integrated on a single screen, utilizing shield regions and shield-touch sensing multiple-use regions to shield noise in fingerprint recognition mode and function as touch sensing regions in touch sense mode, enhancing both fingerprint recognition and touch sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fingerprint sensor and touch sensor are integrated on a single screen, then device complexity is reduced and configuration is simplified, but noise interference increases and signal quality deteriorates
Solution Approach 1:
The integrated sensor is divided into distinct functional regions: fingerprint sensing regions (first and second regions) and touch sensing regions (third and fourth regions). This spatial segmentation allows independent optimization of each function while maintaining integration, reducing noise interference between fingerprint and touch sensing operations.
Solution Approach 2:
Shield regions are introduced as intermediary elements between the fingerprint sensing regions and trace regions. These shield regions act as mediators that block noise and electromagnetic interference from affecting the sensitive fingerprint sensing areas, thereby improving signal quality while maintaining the integrated configuration.
2Measurement precision
If shield regions are added to reduce noise interference, then fingerprint recognition quality is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The shield regions serve multiple functions: they block noise interference for fingerprint sensing, acts as structural support elements, and help define the boundaries between different sensing regions. This multi-functionality reduces the need for additional separate components, thereby managing manufacturing complexity while improving fingerprint recognition quality.
Solution Approach 2:
The shield regions are integrated into the same substrate and fabrication process as the fingerprint and touch sensing regions, rather than being separate add-on components. This merging of functions into a single integrated structure simplifies the manufacturing process compared to using separate shielded modules.
3Reliability
If trace regions are used for signal transmission, then fingerprint sensor functionality is enabled, but noise interference degrades signal quality
Solution Approach 1:
Shield regions are positioned between the fingerprint sensing regions and the trace regions to act as intermediaries that block noise and electromagnetic interference from the trace regions from reaching the sensitive sensing areas, thereby protecting signal quality while maintaining electrical connectivity through the traces.
Solution Approach 2:
Different regions of the sensor have different functional qualities: the fingerprint sensing regions are optimized for capacitive sensing with specific electrode patterns, the trace regions are optimized for signal transmission with conductive paths, and the shield regions are optimized for noise blocking. This local differentiation of properties reduces interference while maintaining overall system reliability.
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 integrated design improves fingerprint recognition quality by reducing noise interference and simplifies the configuration, while maintaining superior touch sensing capabilities, thus providing enhanced performance in both fingerprint recognition and touch sensing.
Implementation Method 1
at least one shield region and at least one shield-touch sensing multiple-use region provided in the trace region
Implementation Method 2
a touch sensor sensing a touch of a user
Implementation Method 3
a fingerprint sensor recognizing a fingerprint of the user
Data Source
AI summary
A fingerprint recognizable touch screen apparatus, an operating method thereof, and an electronic apparatus including the touch screen apparatus are provided. The fingerprint recognizable touch screen apparatus may include a touch sensor for sensing a touch of a user and a fingerprint sensor for recognizing a fingerprint of the user. The fingerprint sensor may include a fingerprint sensing region, a trace region extending from the fingerprint sensing region, and at least one shield-touch sensing multiple-use region provided in the trace region. The shield-touch sensing multiple-use region may be configured to serve as an electric shield in a fingerprint recognition mode and as a touch sensing region in a touch sense mode. The fingerprint sensor may further include at least one shield region provided in the trace region.