Touch display screen and driving method therefor, and display apparatus
Provided are a touch display screen and a driving method therefor, and a display apparatus. A common electrode layer is divided into a plurality of mutually independent self-capacitance electrodes, and the self-capacitance electrodes are connected to a driving chip via corresponding touch-control traces; and each self-capacitance electrode is connected to a common voltage line via a switching transistor, and a gate electrode of each switching transistor is connected to a control line.
1. A touch display screen, comprising:
a driving chip;
a common electrode layer, partitioned into a plurality of mutually independent self-capacitance electrodes, wherein the self-capacitance electrodes are electrically connected to the driving chip through corresponding touch wires;
a common voltage line, electrically connected with the driving chip;
a control line, electrically connected with the driving chip; and
a plurality of switching transistors, wherein first electrodes of the plurality of switching transistors are electrically connected with the self-capacitance electrodes correspondingly, a gate electrode of each of the plurality of switching transistors is electrically connected with the control line, and a second electrode of the each switching transistor is electrically connected with the common voltage line;
wherein the touch display screen further comprises: a voltage following circuit arranged between the common voltage line and the driving chip,
wherein the driving chip is electrically connected with the common voltage line through the voltage following circuit.
2. The touch display screen according to claim 1 , wherein the touch display screen comprises a display region and a bezel region; the self-capacitance electrodes are arranged in the display region; and the plurality of switching transistors, the common voltage line and the control line are arranged in the bezel region; and
the touch display screen further comprises first fanout lines which are in one-to-one correspondence with the self-capacitance electrodes, and the self-capacitance electrodes are electrically connected with the first electrodes of the plurality of switching transistors correspondingly through the first fanout lines.
3. The touch display screen according to claim 2 , wherein the plurality of switching transistors are arranged on a same side of the bezel region.
4. The touch display screen according to claim 3 , wherein the plurality of switching transistors are arranged on a side opposite to the driving chip; and the touch wires are multiplexed as the first fanout lines.
5. The touch display screen according to claim 2 , wherein the plurality of switching transistors corresponding to the self-capacitance electrodes are respectively arranged on a side of the bezel region close to the self-capacitance electrodes.
6. The touch display screen according to claim 2 , wherein extending directions of the first fanout lines are identical, and the first fanout lines are arranged on a same layer.
7. The touch display screen according to claim 1 , wherein the touch display screen comprises a display region and a bezel region, the self-capacitance electrodes are arranged in the display region, and the each switching transistor is respectively arranged in a region where a corresponding self-capacitance electrode is arranged;
the common voltage line and the control line are both arranged in the bezel region; and
the touch display screen further comprises second fanout lines which are in one-to-one correspondence with second electrodes of the plurality of switching transistors, and the second electrodes of the plurality of switching transistors are electrically connected with the common voltage line through corresponding second fanout lines.
8. The touch display screen according to claim 7 , wherein extending directions of the second fanout lines are identical, and the second fanout lines are arranged on a same layer.
9. The touch display screen according to claim 8 , wherein the extending directions of the second fanout lines and extending directions of the touch wires are identical, and the second fanout lines and the touch wires are arranged on the same layer.
10. A display apparatus, comprising the touch display screen according to claim 1 .
11. A driving method for the touch display screen according to claim 1 , comprising:
controlling, by the driving chip, each of the plurality of switching transistors to be conducted through the control line, and providing a common voltage signal for the common voltage line and each of the touch wires when the touch display screen performs displaying; and
controlling, by the driving chip, each of the plurality of switching transistors to be cut off through the control line, providing a touch driving signal for each touch wire and detecting a change of a capacitance value of each self-capacitance electrode through each touch wire so as to determine a touch position when the touch display screen performs touch.
12. The driving method according to claim 11 , further comprising:
providing, by the driving chip, a touch driving signal for the common voltage line when the touch display screen performs touch.