Display device and electronic unit

Abstract

The display device with high detection accuracy includes: display pixel electrodes; a common electrode; a display function layer; a display control circuit performing image display control by applying a pixel voltage to each of the display pixel electrodes and applying a common drive voltage to the common electrode, the common drive voltage inverting in synchronization with a drive cycle of the image display control; a touch detection electrode cooperating with the common electrode to form a capacitor; and a touch detection circuit detecting an external proximity object, based on a detection signal obtained from the touch detection electrode in response to the common drive voltage applied to the common electrode. The touch detection circuit corrects the detection signal based on a gray scale of the image signal at the time of acquisition of the detection signal, and performs the detection operation.

1 .- 20 . (canceled) 
     
     
         21 . A display panel with a touch detection function, the display panel comprising:
 a signal generation section selecting one pulse period from a plurality of pulse periods prepared beforehand, and generating a synchronization signal including a series of pulses appearing at the selected pulse period;   a display section performing display based on the synchronization signal; and   a touch detection section performing touch detection operation based on the synchronization signal.   
     
     
         22 . The display panel according to  claim 21 ,
 wherein the display section performs display for one screen in a pulse duration in which the series of pulses continues.   
     
     
         23 . The display panel according to  claim 22 ,
 wherein the touch detection section performs the touch detection operation in the pulse duration.   
     
     
         24 . The display panel according to  claim 23 ,
 wherein the touch detection section performs the touch detection operation, also in a blanking period in the pulse duration.   
     
     
         25 . The display panel according to  claim 21 ,
 wherein the pulse period is set by a clock count of a base clock, and   the signal generation section changes the pulse period by changing a clock frequency of the base clock.   
     
     
         26 . The display panel according to  claim 22 ,
 wherein the pulse duration is included in a frame period based on an image signal supplied.   
     
     
         27 . The display panel according to  claim 21 , further comprising:
 a plurality of drive electrodes arranged side by side to extend in one direction;   a detection electrode arranged side by side to extend in a direction intersecting the drive electrode;   a plurality of pixel electrodes; and   a display element performing display based on a voltage of the drive electrode and a voltage of the pixel electrode,   wherein, based on the synchronization signal, the display section performs display by driving and thereby sequentially scanning a plurality of the display elements per a plurality of the display elements corresponding to each of the drive electrodes, and   at timing synchronized with the synchronization signal, the touch detection section sequentially applies a drive signal to the plurality of drive electrodes, and detects a touch event based on a detection signal outputted from the detection electrode.   
     
     
         28 . The display panel according to  claim 27 ,
 wherein the plurality of drive electrodes form a plurality of drive electrode blocks each including a predetermined number of the drive electrodes, and   the touch detection section applies the drive signal to each of the drive electrode blocks, for each drive period including a predetermined number of the pulse periods.   
     
     
         29 . A method of driving a display panel with a touch detection function, the method comprising:
 selecting one pulse period from a plurality of pulse periods prepared beforehand, and generating a synchronization signal that includes a series of pulses appearing at the selected pulse period;   performing display for one screen, and performing touch detection operation, based on the series of pulses of the synchronization signal; and   switching display of a screen, for each predetermined frame period.   
     
     
         30 . A drive circuit comprising:
 a signal generation section selecting one pulse period from a plurality of pulse periods prepared beforehand, and generating a synchronization signal that includes a series of pulses appearing at the selected pulse period;   a display drive section driving a display panel based on the synchronization signal; and   a touch-detection drive section driving a touch panel based on the synchronization signal.   
     
     
         31 . An electronic unit including a display panel with a touch detection function, and a control section performing operation control using the display panel, the display panel comprising:
 a signal generation section selecting one pulse period from a plurality of pulse periods prepared beforehand, and generating a synchronization signal including a series of pulses appearing at the selected pulse period;   a display section performing display based on the synchronization signal; and   a touch detection section performing touch detection operation based on the synchronization signal.