Display panel with touch detection function, method of driving the same, drive circuit, and electronic unit
View Patent ↗There are provided a display panel with a touch detection function and a method of driving the same, a drive circuit, as well as an electronic unit, which make it possible to reduce an influence of a disturbance noise. The display panel includes: 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.
1. A display panel comprising:
a signal generation section that generates sync signal pulses corresponding to a presence or an absence of a disturbance noise, based on a base clock having a predetermined frequency;
a display section that displays an image, the display section being configured to switch a horizontal period in one frame period of the image, in synchronization with the sync signal pulses; and
a touch detection section that is configured to perform a touch detection operation in synchronization with a pulse period of one or an integral multiple of the sync signal pulses and configured to detect the disturbance noise,
wherein the display section performs display of one horizontal period on a predetermined timing in synchronization with the base clock.
2. The display panel according to claim 1 , wherein the signal generation section selects the pulse period from a plurality of predetermined pulse periods.
3. A method of driving a display panel, the method comprising:
generating sync signal pulses corresponding to a presence or an absence of a disturbance noise, based on a base clock having a predetermined frequency;
displaying an image on a display;
switching a horizontal period in one frame period of the image;
performing a touch detection operation in synchronization with a pulse period of one or an integral multiple of the sync signal pulses;
performing display on a predetermined timing in synchronization with the base clock; and
switching display of a screen, for each of the frame periods of the image.
4. The display panel according to claim 1 , wherein one frame period is constant and independent from the pulse period of the sync signal pulses.
5. The display panel according to claim 1 , wherein the sync signal pulses are generated continuously in a pulse duration, and the pulse duration is included in one frame period of the image.
6. The display panel according to claim 5 , wherein the touch detection section performs the touch detection operation in the pulse duration.
7. The display panel according to claim 6 , wherein the touch detection section performs the touch detection operation, also in a blanking period other than the pulse duration.
8. The display panel according to claim 1 , 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 plurality of display elements performing display based on a voltage of the drive electrode and a voltage of the pixel electrode,
wherein, based on the sync signal pulses, the display section performs display by sequentially scanning a plurality of the display elements by driving each of the display elements corresponding to each of the drive electrodes, and
in synchronization with the same pulse period of the sync signal pulses, the touch detection section sequentially applies a drive signal to the drive electrodes, and detects a touch based on a detection signal outputted from the detection electrode.
9. The display panel according to claim 8 , 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.
10. A drive circuit comprising:
a signal generation section that generates sync signal pulses corresponding to a presence or an absence of a disturbance noise, based on a base clock having a predetermined frequency;
a display section that displays an image, the display section being configured to switch a horizontal period in one frame period of the image, in synchronization with the sync signal pulses; and
a touch detection section that is configured to perform a touch detection operation in synchronization with a pulse period of one or an integral multiple of the sync signal pulses and configured to detect the disturbance noise,
wherein the display section performs display of one horizontal period on a predetermined timing in synchronization with the base clock.
11. 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 that generates sync signal pulses corresponding to a presence or an absence of a disturbance noise, based on a base clock having a predetermined frequency;
a display section that displays an image, the display section being configured to switch a horizontal period in one frame period of the image, in synchronization with the sync signal pulses; and
a touch detection section that is configured to perform a touch detection operation in synchronization with a pulse period of one or an integral multiple of the sync signal pulses and configured to detect the disturbance noise,
wherein the display section performs display of one horizontal period on a predetermined timing in synchronization with the base clock.