Finger pressing pressure detection method

Abstract

The invention relates to a finger pressing pressure detection method. The finger pressing pressure detection method comprises steps that an optical fingerprint sensor is provided, and the optical fingerprint sensor has a contact substrate; before a finger completely covers a bearing area of the contact substrate, relative pressing pressure magnitudes of different pressing processes are acquired according to an area change rate of a fingerprint image in the different pressing processes; after the finger completely covers the bearing area of the contact substrate, relative pressing pressure magnitudes of different pressing processes are acquired according to a gray scale change rate of the fingerprint image in the different pressing processes. According to the method, finger pressing pressure detection can be carried out directly through the optical fingerprint sensor, integration of the optical fingerprint sensor and a piezoelectric sensor can be omitted, the number of components of a system can be reduced, system design difficulty is reduced, and cost is further saved.

Description

technical field [0001] The invention relates to the field of semiconductor manufacturing, in particular to a method for detecting finger pressing pressure. Background technique [0002] The finger pressure sensor can be used to reflect the strength of the action in the game system and enhance the friendliness of the man-machine interface. It is widely used in mobile games and handheld games. Pressure sensors are usually piezoelectric sensors. Piezoelectric sensors are sensors made using the piezoelectric effect produced by certain dielectrics under force. The piezoelectric effect refers to the phenomenon that when certain dielectrics are deformed (including bending and stretching deformation) by an external force in a certain direction, charges will be generated on the surface due to the polarization of internal charges. Piezoelectric materials can be divided into piezoelectric single crystal, piezoelectric polycrystalline and organic piezoelectric materials. The most wi...

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Problems solved by technology

[0003] However, the cost of using a piezoelectric sensor to detect finger pressing pressure is relatively high, and the dedicated piezoelectric sensor is poorly integrated with other systems due to its special material and complex structure, and is not suitable for applications with high integration requirements and volume requirements. Strictly wait for mobile electronics

[0004] Especially when it is necessary to integrate the fingerprint identification function of the optical fingerprint sensor with the function of detecting the pressure of the finger, if a system combining the piezoelectric sensor and the optical fingerprint sensor is used, many components will be added, and the structure and structure of the system will be complicated. The use methods become complicated, which increases the difficulty of system design and increases the cost

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