Electronic device capable of detecting wearing state

Abstract

A wearable electronic device with a function of detecting a wearing state, comprising: a plurality of electrodes; a capacitance calculating circuit, coupled to the electrodes, configured to calculate capacitance variations generated by at least two of the electrode; and a wearing state determining circuit, coupled to the capacitance calculating circuit, configured to determine the wearing state according to the capacitance variations. The wearing state determining circuit determines that the user wears the wearable electronic device in a proper manner if the capacitance variations indicate at least two of the electrodes indicate the user touches wearing state determining circuit. By this way, the wearing state can be auto detected and the wearable electronic device can be correspondingly control according to the wearing state.

What is claimed is: 
     
         1 . A wearable electronic device with a function of detecting a wearing state, comprising:
 a plurality of electrodes;   a capacitance calculating circuit, coupled to the electrodes, configured to calculate capacitance variations generated by at least two of the electrode; and   a wearing state determining circuit, coupled to the capacitance calculating circuit, configured to determine the wearing state according to the capacitance variations;   wherein the wearing state determining circuit determines that the user wears the wearable electronic device in a proper manner if the capacitance variations indicate at least two of the electrodes indicate the user touches wearing state determining circuit.   
     
     
         2 . The wearable electronic device of  claim 1 , further comprising a sensing surface, by which a user can cause the capacitance variations to the electrodes when the user wears the wearable electronic device. 
     
     
         3 . The wearable electronic device of  claim 2 , wherein the wearing state determining circuit determines the wearing state according to locations of the electrodes being touched. 
     
     
         4 . The wearable electronic device of  claim 2 , wherein the wearable electronic device comprises a front surface which can show desired information, and comprises a back surface served as the sensing surface. 
     
     
         5 . The wearable electronic device of  claim 2 , wherein the sensing surface covers the electrodes and the user can cause the capacitance variations to the electrodes when the user non-directly touches the electrodes. 
     
     
         6 . The wearable electronic device of  claim 2 , wherein at least partial of the electrodes exposes outside the sensing surface. 
     
     
         7 . The wearable electronic device of  claim 6 , further comprising isolation material provided on at least part of the exposed partial of the electrodes. 
     
     
         8 . The wearable electronic device of  claim 1 , wherein the electrodes also serve as at least two of following ports of the wearable electronic device: a data port configured to receive data, and a charging port configured to receive a charging voltage. 
     
     
         9 . The wearable electronic device of  claim 8 , wherein the data port and the charging port form a USB port. 
     
     
         10 . The wearable electronic device of  claim 1 , wherein the wearing state comprises a worn state and a taken off state, wherein the wearable electronic device further comprises a processor configured to control the wearable electronic device to switch from a recognized state to a non-recognized state when the smart watch  100  changes from the worn state to the taken off state. 
     
     
         11 . The wearable electronic device of  claim 1 , wherein the electrodes comprises at least one TX electrode and a plurality of RX electrodes, wherein only one of the TX electrode transmits a sensing signal when the RX electrodes receive the sensing signal. 
     
     
         12 . The wearable electronic device of  claim 1 , wherein the electrodes are provided in a plurality of angle regions, and the wearing state determining circuit determines the wearing state according to a number of the angle regions which have an error state. 
     
     
         13 . The wearable electronic device of  claim 12 , wherein the angle region is determined to operate in the error state when more than a predetermined number of electrodes in the angle region have capacitance variation indicating the electrode in the angle region does not touch or does not closely touch skins of the user.