Mobile terminal device

Abstract

Time elapsed from the time when the sensor cover is opened and power supply to the fingerprint sensor is turned from off to on is counted and when there is no fingerprint image read-in command within a specified period of time power supply to the fingerprint sensor is turned off. Even if power supply to the fingerprint sensor is turned off, when a fingerprint image read-in command executes power supply to the fingerprint sensor is turned on and read-in of a fingerprint image commences. If a fingerprint image read-in command executes when the sensor cover is closed, that command is invalidated. In such a configuration, the opening and closing of a sensor cover works in synchronicity with on / off control of power supply for a fingerprint sensor and even when the sensor cover is open, wasteful electricity consumption through power supply continuing if the fingerprint sensor is not used within a specified period of time is prevented.

Description

technical field [0001] The invention relates to a mobile terminal device provided with a fingerprint sensor, in particular to a power saving technology of the mobile terminal device. Background technique [0002] In recent years, personal authentication has become more and more important in many applications that use mobile terminal devices to carry out electronic commerce. Among the means for authenticating individuals, fingerprint authentication is a means that has a high probability of being practically implemented in mobile terminal equipment because of the cost and size of the sensor. [0003] Among existing fingerprint authentication techniques, there are systems equipped with personal computers and utilizing a registration function, using them instead of a door key to enter an apartment building. [0004] However, the prior art has encountered the following problems. First, prior art fingerprint sensors still consume considerable power, and mobile terminal devices p...

AI Technical Summary

Problems solved by technology

First, prior art fingerprint sensors still consume considerable power, and mobile terminal devices powered by batteries with limited power storage capacity can only be used for a short period of time

[0005] Second, most of the prior art fingerprint sensors have a sensor cover because they are susceptible to static electricity and do not have a solid surface, but the sensor power supply does not work synchronously with the opening and closing of the sensor cover, so even when the sensor Provides power even when cover is closed and continues to draw power

[0006] A technique has been described in JP H04-4352U, wherein the power supply of the sensor cover and the fingerprint input part and the fingerprint identification part are synchronous, and the power supply is only input when the sensor cover is opened, but there is still the following problem, that is, when not Power is still consumed when the fingerprint sensor is used with the sensor cover open

In addition, the basic fingerprint registration and authentication method of the above invention is not described, and when there is a fingerprint image read-in instruction before opening the sensor cover—that is, before starting power supply—the operation is unclear

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