Biological recognition sensing device based on electronic static discharge (ESD) protection

Abstract

The invention discloses a biological recognition sensing device based on electronic static discharge (ESD) protection. The biological recognition sensing device comprises multiple sensing unit arrays, first ESD protection units, second ESD protection units and third ESD protection units. The sensing unit arrays comprise multiple sensing units which are arranged at intervals. The first ESD protection units are respectively arranged in the sensing units. The second ESD protection units are respectively formed between every adjacent sensing units. The third ESD protection units are respectively arranged on the peripheries of the sensing unit arrays. The first ESD protection units, the second ESD protection units and the third ESD protection units cooperate to realize that ESD currents in the sensing units flow to the second ESD protection units through the first ESD protection units, and then flow to the third ESD protection units. By classification protection, influence of the ESD to the whole recognition sensing device is weakened step by step.

Description

technical field [0001] The invention relates to the technical field of touch screens, in particular to an ESD protection-based biometric identification sensing device. Background technique [0002] ESD protection has always been an important topic, especially after entering the deep submicron process, with the reduction of related dimensions, the ESD protection capabilities of various devices and circuits decline rapidly, so the design of ESD protection circuits is in a more prominent position Location. [0003] At present, for general IC design, ESD protection is generally processed on PAD (circuit pin). Because the entire chip except for the PAD, other parts are packaged with a plastic package, which effectively isolates the circuit inside the IC from the external space. But for biometric ICs, the entire sensing array is directly in contact with the external space, exposed to the outside, and also in direct contact with the organism to be identified (such as hands, cloth...

AI Technical Summary

Problems solved by technology

But for biometric ICs, the entire sensing array is directly in contact with the external space, exposed to the outside, and also in direct contact with the organism to be identified (such as hands, clothes, etc.), at this time there is no packaging isolation, There are more external electrostatic currents in contact, which increases the pressure of discharging electrostatic current in the circuit

In addition, the area of ​​the induction array is large, so that the electrostatic current in the induction array cannot be released quickly, which may easily cause damage to the working circuit and damage the components in the circuit.

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