Fingerprint sensor based on concealed excitation ring
A fingerprint sensor and excitation ring technology, which is applied in the direction of acquiring/arranging fingerprints/palmprints, instruments, characters and pattern recognition, etc., can solve the problems of increasing the packaging cost of fingerprint sensors and reducing comfort, and achieves convenient and comfortable application and saves packaging Cost, the effect of improving collection quality
Pending Publication Date: 2020-12-25
宁波爱芯微电子有限公司
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- Abstract
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- Claims
- Application Information
AI Technical Summary
Problems solved by technology
For sensitive people, when the finger touches the excitation ring directly and a large current signal is injected into the finger, occasional tingling often occurs, which reduces the comfort of product use
At the same time, the existence of the excitation ring increases the cost of the fingerprint sensor package
These factors limit the application of the excitation ring in the fingerprint identification device
Method used
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Embodiment Construction
[0033] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings, so as to make the technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned herein.
[0034] In the drawings, components with the same structure are denoted by the same numerals, and components with similar structures or functions are denoted by similar numerals. The size and thickness of each component shown in the drawings are shown arbitrarily, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, some places in the drawings schematically exaggerate the thickness of components appropriately.
[0035] The inventors found that if figure 1 and figure 2 The shown traditional capacitive fingerprint sensor compris...
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Abstract
The invention discloses a fingerprint sensor based on a concealed excitation ring, which relates to the technical field of integrated circuits and comprises a fingerprint sensing chip, a substrate, aplastic package layer and the concealed excitation ring, wherein the fingerprint sensing chip is mounted on the substrate, and the substrate is used as a carrier of the fingerprint sensing chip to conduct a signal on the fingerprint sensing chip to the outside; the plastic package layer covers the fingerprint sensing chip to protect the fingerprint sensing chip from external physical damage, moisture invasion and chemical corrosion; the fingerprint sensor is attached to the module PCB, and the module PCB serves as a carrier of the fingerprint sensor and is used for bearing the fingerprint sensor; and a hidden excitation ring is integrated into the fingerprint sensor. According to the invention, the packaging cost of the fingerprint sensor is reduced, the installation difficulty and the installation cost when the fingerprint sensor is embedded into a complete machine are reduced, direct contact between human fingers and electric signals is avoided, interference introduced by an excitation ring is avoided, the acquisition quality of fingerprint images is improved, and the robustness of image acquisition performance is stronger.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a fingerprint sensor based on a concealed excitation ring. Background technique [0002] In the current technology, fingerprint sensors have been widely used in fingerprint identification devices such as various smart locks, electronic padlocks, mobile phones, etc., and use the fingerprint characteristics of the human body to identify personal identities. The fingerprint sensor is mainly divided into three types: optical fingerprint sensor, capacitive fingerprint sensor and ultrasonic fingerprint sensor. Among them, the capacitive fingerprint sensor is widely used in fingerprint locks and various smart embedded devices due to its small size, low power consumption, easy integration, low cost, and good product consistency. According to most application scenarios, the fingerprint sensor used in the mainstream fingerprint locks on the market has a ring outside, which is ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G06K9/00
CPCG06V40/1312G06V40/1306
Inventor 李富民童红杰
Owner 宁波爱芯微电子有限公司