Electronic devices and signature wakeup methods thereof

Patent metadata

Field	Value
Publication number	US-2016018914-A1
Application number	US-201414334762-A
Country	US
Kind code	A1
Filing date	Jul 18, 2014
Priority date	Jul 18, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

An electronic device including a touch sensor and a processing unit is provided. The touch sensor is disposed on or under a display, and generates touch data for a touch detected thereon or therenear when the electronic device is locked with the display in a sleep state. The processing unit determines whether the touch data matches a predetermined signature according to the touch data, and wakes the display from the sleep state and unlocks the electronic device when the touch data matches the predetermined gesture.

First claim

1 . An electronic device, comprising:
a touch sensor, disposed on or under a display, generating touch data for a touch detected thereon when the electronic device is locked with the display in a sleep state, without determining that a stylus pen has been pulled out from the electronic device; and a processing unit, determining whether the touch data matches a predetermined signature, and waking the display from the sleep state and unlocking the electronic device when the touch data matches the predetermined signature.

2 . The electronic device of claim 1 , wherein the processing unit further determines a first correlation between shapes of a signature formed by the touch and the predetermined signature, a second correlation between input velocities of the signature and the predetermined signature, and a third correlation between input curvatures of the signature and the predetermined signature, and the touch data is determined to match the predetermined signature when a statistical value of the first correlation, the second correlation, and the third correlation is greater than a predetermined threshold.

3 . The electronic device of claim 1 , wherein the touch sensor is further configured to use a first scan rate when the display is not touched in the sleep state, and to use a second scan rate higher than the first scan rate when the touch is detected in the sleep state.

4 . The electronic device of claim 3 , wherein the processing unit further determines whether the touch is detected in concurrence with another touch and whether an area covered by the touch on the display is not within a predetermined range, configures the touch sensor to use the second scan rate when the touch is not detected in concurrence with another touch and the area covered by the touch is within the predetermined range, and configures the touch sensor to use the first scan rate when the touch is detected in concurrence with another touch or the area covered by the touch is not within the predetermined range.

5 . The electronic device of claim 4 , wherein the processing unit further determines whether a track length of the touch on the display over a predetermined time period is less than a predetermined threshold when the touch is not detected in concurrence with another touch and the area covered by the touch is within the predetermined range, and configures the touch sensor to use the first scan rate when the track length of the touch over the predetermined time period is less than the predetermined threshold.

6 . The electronic device of claim 1 , wherein the processing unit further launches an Application (APP) according to the predetermined signature when the touch data matches the predetermined signature.

7 . The electronic device of claim 1 , wherein the processing unit further determines a first correlation between shapes of a signature formed by the touch and the predetermined signature, and a second correlation between input velocities of the signature and the predetermined signature, and the touch data is determined to match the predetermined signature when a statistical value of the first correlation and the second correlation is greater than a predetermined threshold.

8 . The electronic device of claim 1 , wherein the processing unit further determines a first correlation between shapes of a signature formed by the touch and the predetermined signature, and a second correlation between input curvatures of the signature and the predetermined signature, and the touch data is determined to match the predetermined signature when a statistical value of the first correlation and the second correlation is greater than a predetermined threshold.

9 . The electronic device of claim 1 , wherein the processing unit further determines a first correlation between input velocities of the signature and the predetermined signature, and a second correlation between input curvatures of the signature and the predetermined signature, and the touch data is determined to match the predetermined signature when a statistical value of the first correlation and the second correlation is greater than a predetermined threshold.

10 . A signature wakeup method for an electronic device comprising a display with a touch sensor disposed thereon or thereunder, the signature wakeup method comprising:
generating touch data for a touch, which is detected on the display by the touch sensor, when the electronic device is locked with the display in a sleep state, without determining that a stylus pen has been pulled out from the electronic device; determining whether the touch data matches a predetermined signature; and waking the display from the sleep state and unlocking the electronic device when the touch data matches the predetermined gesture signature.

11 . The signature wakeup method of claim 10 , further comprising:
determining a first correlation between shapes of a signature formed by the touch and the predetermined signature, a second correlation between input velocities of the signature and the predetermined signature, and a third correlation between input curvatures of the signature and the predetermined signature, wherein the touch data is determined to match the predetermined signature when a statistical value of the first correlation, the second correlation, and the third correlation is greater than a predetermined threshold.

12 . The signature wakeup method of claim 10 , further comprising:
configuring the touch sensor to use a first scan rate when the display is not touched in the sleep state; and configuring the touch sensor to use a second scan rate higher than the first scan rate when the touch is detected in the sleep state.

13 . The signature wakeup method of claim 12 , further comprising:
determining whether the touch is detected in concurrence with another touch and whether an area covered by the touch on the display is not within a predetermined range; configuring the touch sensor to use the second scan rate when the touch is not detected in concurrence with another touch and the area covered by the touch is within the predetermined range; and configuring the touch sensor to use the first scan rate when the touch is detected in concurrence with another touch or the area covered by the touch is not within the predetermined range.

14 . The signature wakeup method of claim 13 , further comprising:
determining whether a track length of the touch on the display over a predetermined time period is less than a predetermined threshold when the touch is not detected in concurrence with another touch and the area covered by the touch is within the predetermined range; and configuring the touch sensor to use the first scan rate when the track length of the touch over the predetermined time period is less than the predetermined threshold.

15 . The signature wakeup method of claim 10 , further comprising:
launching an Application (APP) according to the predetermined signature when the touch data matches the predetermined signature.

16 . The signature wakeup method of claim 10 , further comprising:
determining a first correlation between shapes of a signature formed by the touch and the predetermined signature, and a second correlation between input velocities of the signature and the predetermined signature, wherein the touch data is determined to match the predetermined signature when a statistical value of the first correlation and the second correlation is greater than a predetermined threshold.

17 . The signature wakeup method of claim 10 , further comprising:
determining a first

Assignees

• Mediatek Inc

Inventors

• Kuo Chung-Jen
• Hsiao Chih-Hsiang

Classifications

• G06F21/74

  operating in dual or compartmented mode, i.e. at least one secure mode · CPC title

• G06F21/82 Primary

  Protecting input, output or interconnection devices · CPC title

• G06F21/554

  involving event detection and direct action · CPC title

• G06F1/3262 Primary

  Power saving in digitizer or tablet · CPC title

• H04M2250/22

  including a touch pad, a touch sensor or a touch detector · CPC title