Display device with touch detection function and electronic apparatus

A display device with a touch detection function, comprising:

• a display area where a plurality of pixel electrodes are arranged in a matrix having a first direction and a second direction crossing the first direction above a substrate;
• drive electrodes each extending in the second direction, the drive electrodes being arranged in the first direction and provided so as to face the pixel electrodes;
• a display functional layer having an image display function of displaying an image on the display area;
• a plurality of pixel signal lines each coupled to the pixel electrodes, the pixel signal lines each extending in the first direction;
• a source selector that are coupled to the pixels through the pixel signal lines and that performs a switching operation, the source selector including a plurality of source switches;
• a control device for performing image display control by applying a display drive voltage between the pixel electrodes and the drive electrodes based on an image signal to exert the image display function of the display functional layer, the control device including a drive signal generator for generating the display drive voltage and a touch drive signal, and a source driver that is a circuit for supplying a pixel signal to each of the pixel electrodes, the source driver being coupled to the pixel signal lines through the source switches of the source selector;
• a touch detection electrode facing the drive electrodes and forming a capacitance between the touch detection electrode and the drive electrodes;
• a touch detection unit for detecting a position of a proximity object based on a detection signal from the touch detection electrode;
• a first wire that extends in the first direction and arranged in a frame area positioned outside the display area, the first wire being coupled with an output of the drive signal generator;
• and a plurality of selection switches for selecting the drive electrodes to be coupled to the first wire based on a selection signal of the control device, the selection signal being a signal for identifying a period during which the drive signal is supplied to the drive electrodes from the drive signal generator through the first wire, wherein:
• the drive signal generator includes a first voltage generator for generating a first voltage, a second voltage generator for generating a second voltage lower than the first voltage, and a switching circuit for outputting the touch drive signal or the display drive voltage to the first wire based on the first voltage, the second voltage, and a third voltage which is a constant voltage according to an identification signal for identifying a touch detection operation period during which a touch detection operation is performed and a display operation period during which a display operation is performed;
• wherein the drive signal generator supplies, in the display operation period, the second voltage as the display drive voltage to the first wire that is a same wire to which the drive signal generator supplies, in the touch detection operation period, a rectangular wave switched between the first voltage and the third voltage as the touch drive signal, wherein the selection switches are arranged in the frame area along the first wire and overlapped by the first wire to allow the display drive voltage and the touch drive signal to be supplied through the same wire, wherein each of the selection switches includes a first gate electrode and a second gate electrode, and wherein the selection switches select the drive electrodes to be coupled to the first wire by opening or closing a coupling between a first coupling conductor and a second coupling conductor according to the selection signal from the control device to the first gate electrode and the second gate electrode.

An electronic apparatus comprising a display device with a touch detection function capable of detecting an external proximity object, wherein the display device with a touch detection function comprises:

• a display area where a plurality of pixel electrodes are arranged in a matrix having a first direction and a second direction crossing the first direction above a substrate;
• drive electrodes each extending in the second direction, the drive electrodes being arranged in the first direction and provided so as to face the pixel electrodes;
• a display functional layer having an image display function of displaying an image on the display area;
• a plurality of pixel signal lines each coupled to the pixel electrodes, the pixel signal lines each extending in the first direction;
• a source selector that are coupled to the pixels through the pixel signal lines and that performs a switching operation, the source selector including a plurality of source switches;
• a control device for performing image display control by applying a display drive voltage between the pixel electrodes and the drive electrodes based on an image signal to exert the image display function of the display functional layer, the control device including a drive signal generator for generating the display drive voltage and a touch drive signal, and a source driver that is a circuit for supplying a pixel signal to each of the pixel electrodes, the source driver being coupled to the pixel signal lines through the source switches of the source selector;
• a touch detection electrode facing the drive electrodes and forming a capacitance between the touch detection electrode and the drive electrodes;
• a touch detection unit for detecting a position of a proximity object based on a detection signal from the touch detection electrode;
• a first wire that extends in the first direction and arranged in a frame area positioned outside the display area, the first wire being coupled with an output of the drive signal generator;
• and a plurality of selection switches for selecting the drive electrodes to be coupled to the first wire based on a selection signal of the control device, the selection signal being a signal for identifying a period during which the drive signal is supplied to the drive electrodes from the drive signal generator through the first wire, wherein the drive signal generator includes a first voltage generator for generating a first voltage, a second voltage generator for generating a second voltage lower than the first voltage, and a switching circuit for switching between the single first voltage and the second voltage to output to the first wire, wherein the drive signal generator supplies, in a touch detection operation period, the display drive voltage that is an alternative voltage of the first voltage and the second voltage to the first wire that is a same wire to which the drive signal generator supplies, in a display operation period, the touch drive signal that is the second voltage, wherein the selection switches are arranged in the frame area along the first wire and overlapped by the first wire to allow the display drive voltage and the touch drive signal to be supplied through the same wire, wherein each of the selection switches includes a first gate electrode and a second gate electrode, and wherein the selection switches select the drive electrodes to be coupled to the first wire by opening or closing a coupling between a first coupling conductor and a second coupling conductor according to the selection signal from the control device to the first gate electrode and the second gate electrode.