Fingerprint Sensor Integrated Touch Screen Panel
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Solution Overview
Problem
Capacitive fingerprint sensors integrated with silicon wafers face challenges such as increased size and cost due to the need for high-resolution sensor arrays and ICs, leading to reduced touch performance and sensitivity due to mutual capacitance issues when embedded in touch screens.
Innovation Solution
A fingerprint sensor integrated type touch screen panel with parallel fingerprint/touch driving and sensing electrodes, where some fingerprint/touch sensing electrodes are used for touch sensing, reducing channel numbers and mutual capacitance, allowing simultaneous touch and fingerprint sensing without a separate sensor area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-resolution sensor array and IC are integrated using a silicon wafer for capacitive fingerprint sensing, then fingerprint recognition precision is improved, but device size and complexity increase
Solution Approach 1:
The patent merges the fingerprint sensor array with the touch sensor screen by integrating both functions into a single electrode structure. The same electrode array serves dual purposes: fingerprint recognition during fingerprint mode and touch sensing during touch mode, eliminating the need for separate sensor arrays and reducing overall device complexity while maintaining high measurement precision for both functions
Solution Approach 2:
The electrode array is designed to perform multiple functions - it acts as both a fingerprint sensor and a touch sensor depending on the operational mode. By making the sensor array universal, the patent eliminates the need for separate dedicated fingerprint sensor arrays, thereby reducing device complexity and integration requirements while preserving fingerprint recognition precision
2Adaptability or versatility
If a separate fingerprint sensor area is designated within the touch screen, then fingerprint sensing capability is improved, but touch performance and sensitivity deteriorate due to mutual capacitance issues
Solution Approach 1:
The patent implements dynamic mode switching where the electrode array alternates between fingerprint sensing mode and touch sensing mode. During fingerprint mode, the entire array is dedicated to fingerprint detection; during touch mode, it switches to touch sensing operations. This dynamic reconfiguration allows the system to maintain optimal performance for both functions without permanent degradation from mutual capacitance interference
Solution Approach 2:
The system employs periodic action by sequentially switching between fingerprint sensing operations and touch sensing operations. The electrode array is activated for fingerprint detection during designated time periods, then switched to touch sensing for other periods. This time-division multiplexing approach ensures that each function receives dedicated attention without continuous interference, maintaining both fingerprint sensing capability and touch performance
3Device complexity
If the fingerprint sensor is embedded in the touch screen panel, then integration is improved, but the bezel area increases and active area is reduced
Solution Approach 1:
The patent merges the fingerprint sensor functionality directly into the existing touch screen panel structure by using the same electrode array for both functions. This integration approach eliminates the need for separate fingerprint sensor modules that would occupy additional bezel area, thereby maintaining the full active area of the display while achieving functional integration
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 design eliminates dead zones in the touch screen active area, reduces touch performance deterioration, and maintains sensitivity by integrating fingerprint and touch recognition functions within the active area, resulting in a narrower bezel and cost-effective implementation.
Implementation Method 1
a capacitive sensing panel including a fingerprint/touch sensing electrode group and a fingerprint/touch driving electrode group
Data Source
AI summary
The present disclosure relates to a fingerprint sensor integrated type touch screen panel having at least one fingerprint/touch area and a plurality of touch areas. The touch screen panel includes a fingerprint/touch driving electrode group including a plurality of fingerprint/touch driving electrodes; a fingerprint/touch sensing electrode group including a plurality of fingerprint/touch sensing electrodes; a touch driving electrode group including a plurality of touch driving electrodes; a touch sensing electrode group including a plurality of touch sensing electrodes; and a touch IC configured to supply touch driving signals to the touch driving electrode group and the fingerprint/touch driving electrode group and obtain touch sensing data by sensing the touch sensing electrode group and some of the fingerprint/touch sensing electrodes in a touch sensing mode, and supply fingerprint driving signals to the fingerprint/touch driving electrodes and obtain fingerprint sensing data by sensing the fingerprint/touch sensing electrodes in a fingerprint sensing mode.