Display device with touch detection function and control method thereof

Abstract

According to an aspect, a display device with a touch detection function includes: a touch detector including first group electrodes extending in a first direction and second group electrodes extending in a second direction intersecting the first direction; a display unit that displays an image; a display controller that controls the display unit to display the image on the display unit; and a touch detection controller that detects contact or proximity of a detection target object based on mutual capacitances between the first and the second group electrodes. The touch detection controller measures a frame frequency that is a number of times frames are displayed per unit time, to sequentially output touch drive signals having a frequency corresponding to the frame frequency to the first group electrodes, and to detect the contact or proximity of the detection target object based on signals output from the respective second group electrodes.

What is claimed is: 
     
         1 . A display device with a touch detection function, the display device comprising:
 a touch detector including a plurality of detection electrodes;   a display area configured to display an image;   a display controller configured to control the display area to display the image; and   a touch detection controller configured to detect contact or proximity of a detection target object based on capacitances of the detection electrodes,   wherein   the touch detection controller is configured to measure a frame frequency that is a number of times frames are displayed per unit time, to sequentially output touch drive signals having a frequency corresponding to the frame frequency to the detection electrodes,   the touch detection controller includes:
 a plurality of band-pass filters configured to pass respective signals within a passing frequency band while removing respective signals in other frequency bands from among the signals corresponding to the detection electrodes, and 
   the touch detection controller is configured to set the passing frequency band to include the frequency of the touch drive signals corresponding to the frame frequency.   
     
     
         2 . The display device with a touch detection function according to  claim 1 , wherein
 the touch detection controller is configured to measure the frame frequency based on a vertical synchronizing signal that is supplied from the display controller and that indicates display start timing of each frame.   
     
     
         3 . The display device with a touch detection function according to  claim 1 , wherein
 the detection electrodes include first group electrodes extending in a first direction and second group electrodes extending in a second direction intersecting the first direction, and   the touch detection controller is configured to detect the contact or proximity of the detection target object based on mutual capacitances between the first group electrodes and the second group electrodes.   
     
     
         4 . The display device with a touch detection function according to  claim 1 , wherein
 the touch detection controller is configured to detect the contact or proximity of the detection target object based on electrostatic capacitances of the detection electrodes.   
     
     
         5 . A method for controlling a display device with a touch detection function that includes a touch detector including a plurality of detection electrodes, and a display area configured to display an image, the method comprising:
 measuring a frame frequency that is a number of times frames are displayed per unit time;   sequentially outputting touch drive signals having a frequency corresponding to the frame frequency to the detection electrodes;   detecting contact or proximity of a detection target object based on capacitances of the detection electrodes; and   setting, based on the frame frequency, a passing frequency band that includes the frequency of the touch drive signals to a plurality of band-pass filters that are configured to pass respective signals within the passing frequency band while removing respective signals in other frequency bands from among the signals corresponding to the detection electrodes.   
     
     
         6 . The method according to  claim 5 , further comprising:
 measuring the frame frequency based on a vertical synchronizing signal that indicates display start timing of each frame.   
     
     
         7 . The method according to  claim 5 , wherein
 the detection electrodes include first group electrodes extending in a first direction and second group electrodes extending in a second direction intersecting the first direction, and   the contact or proximity of the detection target object is detected based on mutual capacitances between the first group electrodes and the second group electrodes.   
     
     
         8 . The method according to  claim 5 , wherein
 the contact or proximity of the detection target object is detected based on electrostatic capacitances of the detection electrodes.   
     
     
         9 . A display device with a touch detection function, the display device comprising:
 a plurality of detection electrodes configured to detect whether a detection target object is in proximity thereto;   a display area configured to display an image;   a display controller configured to control the display unit area to display the image; and   a touch detection controller configured to detect contact or proximity of the detection target object based on capacitances of the detection electrodes,   wherein   the touch detection controller is configured to measure a frame frequency that is a number of times frames are displayed per unit time, to output touch drive signals having a frequency corresponding to the frame frequency to the detection electrodes,   a plurality of band-pass filters are configured to pass respective signals within a passing frequency band while removing respective signals in other frequency bands from among the signals corresponding to the detection electrodes, and   the touch detection controller is configured to set the passing frequency band to include the frequency of the touch drive signals corresponding to the frame frequency.   
     
     
         10 . The display device with a touch detection function according to  claim 9 , wherein
 the touch detection controller is configured to measure the frame frequency based on a vertical synchronizing signal that is supplied from the display controller and that indicates display start timing of each frame.   
     
     
         11 . The display device with a touch detection function according to  claim 9 , wherein
 the detection electrodes include first group electrodes extending in a first direction and second group electrodes extending in a second direction intersecting the first direction, and   the touch detection controller is configured to detect the contact or proximity of the detection target object based on mutual capacitances between the first group electrodes and the second group electrodes.   
     
     
         12 . The display device with a touch detection function according to  claim 9 , wherein
 the touch detection controller is configured to detect the contact or proximity of the detection target object based on electrostatic capacitances of the detection electrodes.   
     
     
         13 . A display device with a touch detection function according to  claim 1 , wherein the touch detector is a self-capacitance detection-type. 
     
     
         14 . A display device with a touch detection function according to  claim 9 , wherein the touch detector is a self-capacitance detection-type.