Touch Display Panel and Method for Driving the Same

• US 20160291711A1
• Filed: 01/13/2016
• Published: 10/06/2016
• Est. Priority Date: 04/01/2015
• Status: Active Grant

• Current Assignee: Shanghai AVIC Optoelectronics Company Limited (Tianma Microelectronics Company Limited), Tianma Microelectronics Company Limited
• Original Assignee: Shanghai AVIC Optoelectronics Company Limited (Tianma Microelectronics Company Limited), Tianma Microelectronics Company Limited
• Inventors: Jin, Huijun
• Granted Patent: US 9,958,995 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A touch display panel and a method for driving the same are provided. The touch display panel includes a first substrate; a plurality of electrode units, a plurality of switches, a touch display circuit and a common lead disposed on the first substrate, wherein the common lead is adapted for transmitting a common signal, each electrode unit is connected with the touch display circuit through one of a plurality of first leads, each of the plurality of electrode units is connected with the common lead through one of a plurality of second leads, and each of the plurality of switches is disposed between one of the plurality of second leads and the common lead, so as to disconnect the common lead and the plurality of second leads during a touch sensing period, and connect the common lead and the plurality of second leads during a display period.

Claims

1. A touch display panel, comprising:

a first substrate;

an electrode array disposed on the first substrate, wherein the electrode array comprises a plurality of electrode units arranged in an array structure, and wherein the plurality of electrode units serve as touch sensing electrodes during a touch sensing period, and serve as common electrodes during a display period;

a touch display circuit adapted for applying a touch signal to the plurality of electrode units during the touch sensing period, and applying a common signal to the plurality of electrode units during the display period;

a plurality of first leads adapted for transmitting the touch signal, wherein each of the plurality of electrode units is electrically connected with the touch display circuit through one of the plurality of first leads;

a common lead electrically connected with the touch display circuit and adapted for transmitting the common signal;

a plurality of second leads, wherein each of the plurality of electrode units is electrically connected with the common lead through one of the plurality of second leads; and

a plurality of switches, wherein each of the plurality of switches is disposed between one of the plurality of second leads and the common lead.

2. The touch display panel according to claim 1, further comprising a switch lead adapted for turning on and turning off the plurality of switches.

3. The touch display panel according to claim 2, wherein each switch of the plurality of switches comprises a first thin film transistor, wherein a source of the first thin film transistor is electrically connected with the common lead, a drain of the first thin film transistor is electrically connected with one of the plurality of second leads, and a gate of the first thin film transistor is electrically connected with the switch lead.

4. The touch display panel according to claim 3, wherein the first thin film transistor is an N-type transistor, and wherein the switch lead is adapted for providing a high potential to turn on the first thin film transistor during the display period, and providing a low potential to turn off the first thin film transistor during the touch sensing period.

5. The touch display panel according to claim 3, wherein the first thin film transistor is a P-type transistor, and wherein the switch lead is adapted for providing a low potential to turn on the first thin film transistor during the display period, and providing a high potential to turn off the first thin film transistor during the touch sensing period.

6. The touch display panel according to claim 3, wherein a capacitor is disposed between the gate of the first thin film transistor and the switch lead, a first node is disposed between the capacitor and the first thin film, and the first node is adapted for charging the capacitor.

7. The touch display panel according to claim 6, further comprising a charging circuit electrically connected with the first node, wherein the charging circuit comprises a second thin film transistor, wherein a source of the second thin film transistor is adapted for inputting a first signal, a gate of the second thin film transistor is adapted for inputting a second signal, and a drain of the second thin film transistor is electrically connected with the first node for charging the capacitor.

8. The touch display panel according to claim 1, wherein the common lead and the touch display circuit are disposed on two opposite sides of the electrode array.

9. The touch display panel according to claim 8, wherein the switch lead is adjacent to the common lead.

10. A method for driving a touch display panel comprising a first substrate;

an electrode array disposed on the first substrate, wherein the electrode array comprises a plurality of electrode units arranged in an array structure, and wherein the plurality of electrode units serve as touch sensing electrodes during a touch sensing period, and serve as common electrodes during a display period;

a touch display circuit;

a plurality of first leads, wherein each of the plurality of electrode units is electrically connected with the touch display circuit through one of the plurality of first leads;

a common lead disposed on the first substrate;

a plurality of second leads, wherein each of the plurality of electrode units is electrically connected with the common lead through one of the plurality of second leads; and

a plurality of switches, wherein each of the plurality of switches is disposed between one of the plurality of second leads and the common lead, comprising;

turning on the plurality of switches, and applying a common signal to the plurality of electrode units through both the plurality of first leads and the plurality of second leads; and

turning off the plurality of switches, and applying a touch signal to the plurality of electrode units through the plurality of first leads.

11. The method according to claim 10, wherein the touch display panel further comprises a switch lead connected with each of the plurality of switches;

wherein turning on the plurality of switches and applying a common signal further comprises applying a first potential on the switch lead to turn on the plurality of switches; and

wherein turning off the plurality of switches, and applying a touch signal further comprises applying a second potential on the switch lead to turn off the plurality of switches.

12. The method according to claim 11, wherein each of the plurality of switches comprises a first thin film transistor, wherein a source of the first thin film transistor is electrically connected with the common lead, a drain of the first thin film transistor is electrically connected with one of the plurality of second leads, and a gate of the first thin film transistor is electrically connected with the switch lead;

wherein applying a first potential on the switch lead to turn on the plurality of switches further comprises applying a first potential to the gate through the switch lead to turn on each of the plurality of switches; and

wherein applying a second potential on the switch lead to turn off the plurality of switches further comprises applying a second potential to the gate through the switch lead to turn off each of the plurality of switches.

13. The method according to claim 12, wherein a capacitor is disposed between the gate of the first thin film transistor and the switch lead, a first node is disposed between the capacitor and the first thin film, and the first node is connected with a charging circuit;

wherein applying a first potential to the gate through the switch lead further comprises;

charging the capacitor through the charging circuit to apply a first potential on the switch lead;

applying the first potential on the gate through the switch lead to turn off each of the plurality of switches.

14. The method according to claim 13, wherein the charging circuit comprises a second thin film transistor which is a N-type transistor, a first signal is input to a source of the second thin film transistor, a second signal is input to a gate of the second thin film transistor, and a drain of the second thin film transistor is electrically connected with the first node;

and

wherein charging the capacitor through the charging circuit to apply a first potential on the first lead further comprises raising the first signal and the second signal from a low potential to a high potential to turn on the second thin film transistor for charging the capacitor.

15. The method according to claim 13, wherein the charging circuit comprises a second thin film transistor which is a P-type transistor, a first signal is input to a source of the second thin film transistor, a second signal is input to a gate of the second thin film transistor, and a drain of the second thin film transistor is electrically connected with the first node;

and

wherein charging the capacitor through the charging circuit to apply a first potential on the first lead further comprises raising the first signal from a low potential to a high potential and reducing the second signal from a high potential to a low potential to turn on the second thin film transistor for charging the capacitor.