Integrated Touch Fingerprint Sensor Electrode Pattern
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Solution Overview
Problem
Fingerprint sensor integrated touch screen panels face issues with increased bezel area, complicated construction, and degraded touch sensitivity due to the integration of high-resolution sensor arrays and ICs, which also create dead zones and overlap with touch buttons, affecting fingerprint recognition accuracy.
Innovation Solution
The design incorporates a fingerprint sensor integrated type touch screen panel with combination touch and fingerprint electrodes arranged in a specific pattern within the active area, allowing for high-resolution fingerprint sensing without occupying the bezel area, and using a readout IC to manage touch and fingerprint recognition independently, minimizing mutual capacitance and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a capacitive fingerprint sensor is integrated with a push button assembly, then fingerprint recognition capability is achieved, but the bezel area increases and the construction becomes complicated
Solution Approach 1:
The patent merges the fingerprint sensor array directly with the touch sensor screen in a single integrated structure. The fingerprint sensor electrodes are formed in the same array as the touch sensor electrodes, eliminating the need for separate push button assemblies and reducing overall device complexity while maintaining fingerprint recognition capability
Solution Approach 2:
The integrated sensor array serves multiple functions: it detects both touch events and fingerprint patterns using the same electrode structure. The readout IC independently processes both touch and fingerprint signals, allowing a single component to perform multiple sensing functions without requiring separate dedicated hardware for each function
2Adaptability or versatility
If a push button is used for fingerprint sensing, then fingerprint recognition is enabled, but the sensing area is limited by the button size and overlaps with the display area
Solution Approach 1:
The sensor array is segmented into multiple independently controllable electrode elements that can be selectively activated. During fingerprint sensing, only the relevant portion of the array is activated, allowing the sensing area to extend beyond traditional button boundaries while maintaining precise control over the active sensing region
Solution Approach 2:
The patent transitions from a single-point button-based sensing approach to a two-dimensional array-based sensing system. This dimensional expansion allows fingerprint recognition across a larger area of the display without requiring physical buttons, enabling the sensing function to utilize the planar space of the screen itself
3Area of stationary object
If the fingerprint sensor region is disposed in the display area, then bezel area is reduced, but dead zones are created and touch sensitivity is degraded
Solution Approach 1:
The system dynamically switches between touch sensing mode and fingerprint sensing mode. During normal operation, the integrated electrodes function as touch sensors with full sensitivity. When fingerprint recognition is needed, the system activates fingerprint sensing mode where the same electrodes are used to detect fingerprint patterns, temporarily suspending touch functionality in that region to avoid interference and maintain 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 solution prevents dead zones, reduces bezel area, maintains touch sensitivity, and improves recognition accuracy by optimizing electrode patterns and readout IC functionality, allowing for efficient simultaneous touch and fingerprint recognition.
Implementation Method 1
The capacitive fingerprint sensor utilizes difference of electric charges charged between ridges and valley of the finger contacted thereto
Implementation Method 2
the mutual capacitances between the first channel electrodes 111 and the second channel electrodes 112 are significantly increased
Data Source
AI summary
A touch sensing device comprises a plurality of first touch electrodes and a plurality of second touch electrodes located in an active area of the touch sensing device, the plurality of first touch electrodes and the plurality of second touch electrodes arranged in a first direction. The touch sensing device also includes a plurality of third touch electrodes located in the active area and arranged in a second direction that crosses the first direction. The first touch electrodes, second touch electrodes, and third touch electrodes have a first resolution for sensing touch in the active area. The touch sensing device also includes a plurality of combination touch and fingerprint electrodes located in the active area, the plurality of combination touch and fingerprint electrodes having a second resolution for sensing both touch and a fingerprint in the active area and the second resolution being higher than the first resolution.