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A mechanism to prevent device being locked from unintentional unlock behavior Disclosure Number: IPCOM000243499D
Publication Date: 2015-Sep-25
Document File: 4 page(s) / 57K

Publishing Venue

The Prior Art Database


This invention presents a method of a method of determining whether the passcode unlock behavior is a intentional attempt from strangers or a unintentional one from child. The method includes a) checking the clicking position, passing the check if the clicking position is out of predefined distance from number buttons. b) checking the time interval between two clicks, passing the check if the time interval varies from each two clicks. c) checking the pressing strength, passing the check if the strength varied from each tap.

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Page 01 of 4

A mechanism to prevent device being locked from unintentional unlock behavior

Most of us have set up passcode lock-screen to keep strangers from checking out our privacy. If wrong passcode are entered for several times, the mobile device will be locked for a certain period.

But sometimes, we won't expect the device to be locked by accidental unlock behavior. For example, child may enter a wrong passcode unintentionally when he is playing our mobile phone.

So, it is desired to invent a mechanism to make the phone more smart to distinguish between an intentional passcode unlock behavior from strangers and an unintentional one e.g. from kids.

By analyzing the unlock operation behaviors, there are three major different characters between an intentional one and a unintentional one.

An intentional unlock attempt has following characters:

- Clicking positions are much closer to the number buttons.

- The interval time between each two taps are nearly the same.
- The pressing strength is almost the same for each tap.

While an unintentional one has some different characters as Figure 1:

- Clicking positions are random all over the whole screen.

- The interval time between each two taps are widely different.
- The pressing strength varies from each tap.

- There are more gestures than tap, e.g. slide, shake.

Figure 1. Unintentional unlock behavior


Page 02 of 4

Our solution is to analyze these two kinds of unlock behaviors by checking the a) Clicking position, b)Time interval between two clicks and c)Pressing strength to determine the intentionality.

The state transition flow is described as Figure 2.

Figure 2. State transition flow


Page 03 of 4

S1. "Display Off" - The initial state. Once Home button or Power button pressed, go to C1.

C1. "locked?" - If...