Display panel with touch detection function, method of driving the same, driving circuit, and electronic unit
View Patent ↗There are provide a display panel with a touch detection function, in which display operation is less affected by touch detection operation, a method of driving the display panel with a touch detection function, a driving circuit, and an electronic unit having the display panel with a touch detection function. The display panel with a touch detection function includes: one or more display elements; one or more drive electrodes; one or more touch detection electrodes; and a drive section selectively applying a DC drive signal or an AC drive signal to the drive electrodes.
1. A display panel with a touch detection function comprising:
one or more display elements;
one or more drive electrodes;
a drive section selectively applying a DC drive signal or an AC drive signal to the drive electrodes;
a first wiring and a second wiring; and
one or more switch elements, wherein
the first wiring is applied with the DC drive signal,
the second wiring is applied with the AC drive signal, and
the switch element switches a drive signal, which is applied to the drive electrode, between the DC drive signal of the first wiring and the AC drive signal of the second wiring,
wherein
the display elements perform a write operation for display during a write period,
the AC drive signal has a pulse waveform that transitions from a first voltage to a second voltage corresponding to a DC voltage level of the DC drive signal, and
the drive section applies the AC drive signal to the drive electrodes in order to perform a touch detection drive in a period other than the write period.
2. The display panel according to claim 1 , wherein
the AC drive signal has a pulse waveform that transits from a first voltage to a second voltage corresponding to a DC voltage level of the DC drive signal at a transition timing in a period other than the write period, and
the drive section applies the AC drive signal to the drive electrodes in an enable period including the transition timing, and applies the DC drive signal to the drive electrodes in a period other than the enable period to perform touch detection drive.
3. The display panel according to claim 2 , further comprising:
a touch detection section, wherein
the drive electrodes are formed to extend in a predetermined direction,
the drive section sequentially selects one or more drive electrodes among the drive electrodes as a drive object electrode, and drives the drive object electrode for touch detection while applying the DC drive signal to drive electrodes other than the drive object electrode, and
the touch detection section detects a touch event based on signals output from the touch detection electrodes.
4. The display panel according to claim 1 , wherein
the display element includes:
a liquid crystal layer, and
a pixel electrode disposed facing the drive electrodes with the liquid crystal layer therebetween.
5. The display panel according to claim 1 , wherein
the display element includes:
a liquid crystal layer, and
a pixel electrode disposed facing the drive electrodes with the liquid crystal layer therebetween.
6. An electronic unit comprising:
a display panel with a touch detection function; and
a control section controlling operation using the display panel with a touch detection function, wherein
the display panel with a touch detection function includes:
one or more display elements;
one or more drive electrodes;
a drive section selectively applying a DC drive signal or an AC drive signal to the drive electrodes;
a first wiring and a second wiring; and
one or more switch elements, wherein
the first wiring is applied with the DC drive signal,
the second wiring is applied with the AC drive signal, and
the switch element switches a drive signal, which is applied to the drive electrode, between the DC drive signal of the first wiring and the AC drive signal of the second wiring, wherein
the display elements perform a write operation for display during a write period,
the AC drive signal has a pulse waveform that transitions from a first voltage to a second voltage, and
the drive section applies the AC drive signal to the drive electrodes in order to perform a touch detection drive in a period other than the write period.
7. The display panel according to claim 1 , wherein
the switch element includes: a first switch element disposed between the first wiring and the drive electrode; and a second switch element disposed between the second wiring and the drive electrode,
the first switch performs on/off control of the DC drive signal to be applied to the drive electrode, and
the second switch performs on/off control of the AC drive signal to be applied to the drive electrode.
8. The electronic unit according to claim 6 , wherein
the switch element includes:
a first switch element disposed between the first wiring and the drive electrode; and
a second switch element disposed between the second wiring and the drive electrode,
the first switch performs on/off control of the DC drive signal to be applied to the drive electrode, and
the second switch performs on/off control of the AC drive signal to be applied to the drive electrode.