Display device with touch detection function, drive method thereof, and electronic apparatus

Abstract

According to an aspect, a display device with a touch detection function includes: a scan drive unit that supplies a touch drive signal to a touch detection element in a touch detection operation period different from a display operation period in which a pixel signal and a display drive signal are sequentially supplied to display elements to perform display scanning; and a noise detector that detects noise included in a frequency component sampled by a touch detection unit. When the noise detector detects the noise, the scan drive unit changes a frequency of the touch drive signal in the touch detection operation period and supplies the changed frequency to the touch detection element.

The invention is claimed as follows: 
     
         1 . A display device with a touch detection function comprising:
 a plurality of display elements that perform a display operation based on a pixel signal and a display drive signal;   a touch detection element that detects an external proximity object in accordance with a touch drive signal;   a scan drive unit that supplies the touch drive signal to the touch detection element in a touch detection operation period different from a display operation period in which the pixel signal and the display drive signal are sequentially supplied to the display elements to perform display scanning;   a touch detection unit that performs touch detection by sampling a detection result of the touch detection element at a timing synchronized with the touch drive signal; and   a noise detector that detects noise included in a frequency component sampled by the touch detection unit, wherein   the display scanning for one screen is performed in one frame period,   the one frame period includes the display operation period and the touch detection operation period which do not overlap with each other,   touch detection for the one screen is performed in one touch report period, and   the scan drive unit changes, when the noise detector detects the noise, a frequency of the touch drive signal in the touch detection operation period by changing the number of times of the one touch report period in the one frame period and supplies the changed frequency to the touch detection element.   
     
     
         2 . The display device with a touch detection function according to  claim 1 , wherein,
 when the noise detector detects no noise, the one frame period includes the one touch report period twice, and   when the noise detector detects the noise, the one frame period includes the one touch report period once.   
     
     
         3 . The display device with a touch detection function according to  claim 1  wherein the touch detection element uses a change in a capacitance in accordance with proximity or contact of the external proximity object to detect the external proximity object 
     
     
         4 . The display device with a touch detection function according to  claim 1 , further comprising a plurality of common drive electrodes forming a capacitance with a plurality of touch detection elements, wherein
 the scan drive unit applies the display drive signal to the common drive electrodes in the display operation period and applies the touch drive signal to the common drive electrodes in the touch detection operation period.   
     
     
         5 . A drive method of a display device with a touch detection function including
 a plurality of display elements that perform a display operation based on a pixel signal and a display drive signal, and   a touch detection element that detects an external proximity object in accordance with a touch drive signal, the drive method comprising:   sequentially supplying the pixel signal and the display drive signal to the display elements to perform display scanning, in a display operation period;   supplying the touch drive signal to the touch detection element by a scan drive unit, in a touch detection operation period different from the display operation period;   performing touch detection by sampling a detection result of the touch detection element at a timing synchronized with the touch drive signal; and   detecting noise included in a frequency component sampled in the performing touch detection by a noise detector,   wherein   the display scanning for one screen is performed in one frame period,   the one frame period includes the display operation period and the touch detection operation period which do not overlap with each other,   touch detection for the one screen is performed in one touch report period, and   the scan drive unit changes, when the noise detector detects the noise, a frequency of the touch drive signal in the touch detection operation period by changing the number of times of the one touch report period in the one frame period and supplies the changed frequency to the touch detection element.   
     
     
         6 . An electronic apparatus including a display device with a touch detection function, the display device with a touch detection function comprising:
 a plurality of display elements that perform a display operation based on a pixel signal and a display drive signal;   a touch detection element that detects an external proximity object in accordance with a touch drive signal;   a scan drive unit that supplies the touch drive signal to the touch detection element in a touch detection operation period different from a display operation period in which the pixel signal and the display drive signal are sequentially supplied to the display elements to perform display scanning;   a touch detection unit that performs touch detection by sampling a detection result of the touch detection element at a timing synchronized with the touch drive signal; and   a noise detector that detects noise included in a frequency component sampled by the touch detection unit,   wherein   the display scanning for one screen is performed in one frame period,   the one frame period includes the display operation period and the touch detection operation period which do not overlap with each other,   touch detection for the one screen is performed in one touch report period, and   the scan drive unit changes, when the noise detector detects the noise, a frequency of the touch drive signal in the touch detection operation period by changing the number of times of the one touch report period in the one frame period and supplies the changed frequency to the touch detection element.