Fingerprint Identification Module Using Touch Panel Electrodes
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Solution Overview
Problem
Current fingerprint identification sensors are expensive and have a small sensing region, limiting their widespread adoption in electronic devices.
Innovation Solution
A fingerprint identification device utilizing a fingerprint identification module with gate lines and signal lines to create sensing regions, including thin film transistors and sensing electrodes that generate an electric field for fingerprint detection, integrated into existing touch panels to reduce costs and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fingerprint identification sensors are designed and manufactured by chip technology, then measurement precision is improved, but device complexity and cost increase while sensing region area decreases
Solution Approach 1:
The sensing region is divided into multiple pixel units, each containing sensing electrodes arranged in array patterns. This segmentation allows the large-area sensing region to be composed of numerous small sensing elements, achieving both large coverage area and precise fingerprint detection through the collective contribution of individual pixels.
Solution Approach 2:
The patent transitions from traditional three-dimensional capacitive sensing structures to a two-dimensional planar electrode arrangement on the touch panel surface. By using interdigitated electrode patterns in the X and Y directions, the sensing function is achieved in a flat configuration, enabling large-area coverage without increasing thickness or complexity.
2Measurement precision
If fingerprint identification sensors are designed and manufactured by chip technology, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The fingerprint sensing function is merged with the existing touch panel structure by integrating sensing electrodes directly into the touch sensor layers. This combination eliminates the need for separate fingerprint sensor chips and their associated complex manufacturing processes, reducing overall system cost while maintaining detection precision through the unified electrode design.
Solution Approach 2:
The touch panel serves multiple functions simultaneously: touch detection and fingerprint recognition. By making the touch panel electrodes serve dual purposes as both touch sensors and fingerprint sensing elements, the invention eliminates the need for dedicated fingerprint sensor components, thereby reducing manufacturing complexity and cost while preserving fingerprint identification accuracy.
3Measurement precision
If fingerprint identification sensors are designed and manufactured by chip technology, then measurement precision is improved, but device volume increases
Solution Approach 1:
The fingerprint sensing function is merged with the existing touch panel structure by integrating sensing electrodes directly into the touch sensor layers. This combination eliminates the need for separate fingerprint sensor chips and their associated complex manufacturing processes, reducing overall system cost while maintaining detection precision through the unified electrode design.
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
The solution enables cost-effective and compact fingerprint identification, suitable for widespread application in electronic devices, enhancing security features like unlocking and mobile payments without significant volume or cost increases.
Implementation Method 1
an electric field is generated between the transmitting electrode and the receiving electrode adjacent to the transmitting electrode, and a direction of the electric field is from the transmitting electrode to the receiving electrode adjacent to the transmitting electrode
Data Source
AI summary
The present disclosure provides a fingerprint identification device, a touch panel, an input device and a fingerprint identification method. The fingerprint identification device includes a fingerprint identification module, gate lines and signal lines. The gate lines and the signal lines cross so as to define a plurality of sensing regions including a thin film transistors and a sensing electrode connected to the thin film transistors. A gate electrode of the thin film transistor is connected to the corresponding gate line, a source electrode is connected to the corresponding signal line, and a drain electrode is connected to the corresponding sensing electrode. The signal lines include signal-transmitting lines and signal-receiving lines, the sensing electrodes include transmitting electrodes and receiving electrodes. An electric field is generated between the transmitting electrode and the receiving electrode adjacent to the transmitting electrode, and a direction of the electric field is from the transmitting electrode to the receiving electrode adjacent to the transmitting electrode. The fingerprint identification module is connected to the signal-receiving lines, and determines, by detecting the intensity of the electric field when a finger is in the electric field, a fingerprint of the finger.