Touch display panel including touch sensing electrode and method for driving touch display panel

• US 10,013,133 B2
• Filed: 02/09/2016
• Issued: 07/03/2018
• Est. Priority Date: 09/07/2015
• Status: Active Grant

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited), Tianma Microelectronics Company Limited
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited), Tianma Microelectronics Company Limited
• Inventors: Yuan, Yong
• Primary Examiner(s): Snyder, Adam J
• Application Number:
  US15/019,961
• Publication Number:
  US 20170068360A1
• Time in Patent Office: 875 Days
• Field of Search: 345174, 178 1806
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

A touch display panel and a method for driving the touch display panel. The touch display panel including: a substrate; first scan lines and data lines; sub-pixels arranged in an array; touch sensing electrodes disposed in an array, each of which corresponds to the sub-pixels; first control switches, wherein each of the touch sensing electrodes is connected to at least one of the data lines via one of the first control switches. When in a touch state, the first control switch is turned on, so that the at least one of the data lines is configured to provide a touch signal to the touch sensing electrode corresponding to the data lines; and when in a display state, the first control switch is turned off, so that each of the data lines is configured to provide a display signal to the sub-pixel corresponding to the data line.

Claims

1. A touch display panel, comprising:

a substrate;

a plurality of first scan lines and a plurality of data lines both disposed on the substrate;

a plurality of sub-pixels arranged in an array, which are defined by the data lines and the first scan lines which are insulated from and intersect the data lines;

a plurality of touch sensing electrodes disposed in an array, each of which corresponds to a plurality of the sub-pixels;

a plurality of first control switches, wherein each of the touch sensing electrodes is connected to at least one of the data lines via the first control switches;

a plurality of second control switches and a first common electrode wiring disposed on the substrate, and each of the touch sensing electrodes is connected to the first common electrode wiring by at least one of the second control switches; and

a plurality of second scan lines disposed on the substrate, and each of the second scan lines is connected to a control terminal of the first control switch and a control terminal of the second control switch, and is configured for controlling the first control switch to be turned on or off and the second control switch to be turned on or off;

wherein each of the second scan lines is connected to the first common electrode wiring to receive a voltage signal from the first common electrode wiring, and the voltage signal serves as a turning-on signal for the first control switch and the second control switch;

when the touch display panel being in a touch state, the first control switch is turned on, so that the at least one of the data lines is configured to provide a touch signal to the touch sensing electrode corresponding to the at least one of the data lines, and the second control switch is turned off, so that the first common electrode wiring is electrically insulated from each of the touch sensing electrodes; and

when the touch display panel being in a display state, the first control switch is turned off, so that each of the data lines is configured to provide a display signal to the sub-pixel corresponding to the data line, and the second control switch is turned on, so that the first common electrode wiring is configured to provide the same electric potential to each of the touch sensing electrodes.

2. The touch display panel of claim 1, wherein a turned-on condition of the first control switch is opposite to that of the second control switch.

3. The touch display panel of claim 2, wherein each of the sub-pixels comprises at least one third control switch, and a turned-on condition of the third control switch is the same as that of the second control switch.

4. The touch display panel of claim 3, wherein the first control switch is a P-type transistor, and both the second control switch and the third control switch are N-type transistors.

5. The touch display panel of claim 3, wherein the first control switch is an N-type transistor, and both the second control switch and the third control switch are P-type transistors.

6. The touch display panel of claim 1, wherein the second scan line is disposed in the same layer as the first scan line.

7. The touch display panel of claim 1, wherein the first common electrode wiring is provided at periphery of a display region on the substrate and is formed in the same layer as the data lines or the first scan line.

8. The touch display panel of claim 7, wherein at least a portion of the second control switches are connected between the touch sensing electrode and the first common electrode wiring, and at least another portion of the second control switches are connected between at least adjacent two of the touch sensing electrodes.

9. The touch display panel of claim 1, wherein a common electrode is further disposed on the substrate, and comprises a plurality of the touch sensing electrodes.

10. A method for driving a touch display panel, comprising:

when the touch display panel is in a touch state, generating a touch enabling signal to turn on the first control switch, so that the at least one of the data lines provides a touch signal to the touch sensing electrode corresponding to the at least one of the data lines and the sub-pixel is electrically insulated from the data line corresponding to the sub-pixel, and generating a display turning-off signal to turn off the second control switch so that the first common electrode wiring is electrically insulated from each of the touch sensing electrodes; and

when the touch display panel is in a display state, generating a touch disabling voltage signal to turn off the first control switch, so that each of the data lines is electrically insulated from the touch sensing electrode corresponding to the data line and the data line provides a display signal to the sub-pixel corresponding to the data line, and generating a display turning-on signal to turn on the second control switch so that the first common electrode wiring provides the same electric potential to each of the touch sensing electrodes;

wherein the touch display panel comprises;

a substrate;

a plurality of first scan lines and a plurality of data lines both disposed on the substrate;

a plurality of sub-pixels arranged in an array, which are defined by the data lines and the first scan lines which are insulated from and intersect the data lines;

a plurality of touch sensing electrodes disposed in an array, each of which corresponds to a plurality of the sub-pixels;

a plurality of first control switches, wherein each of the touch sensing electrodes is connected to at least one of the data lines via the first control switches;

a plurality of second control switches and a first common electrode wiring are further disposed on the substrate; and

each of the touch sensing electrodes is connected to the first common electrode wiring by at least one of the second control switches; and

a plurality of second scan lines disposed on the substrate, a control terminal of the first control switch and a control terminal of the second control switch are connected to corresponding one of the second scan lines, and the touch enabling signal and the touch disabling signal are inputted through the second scan line to control the first control switch to be turned on or off and the second control switch to be turned on or off;

wherein each of the second scan lines is connected to the first common electrode wiring to receive a voltage signal from the first common electrode wiring, and the voltage signal serves as a turning-on signal for the first control switch and the second control switch.

11. The method of claim 10, wherein a turned-on condition of the first control switch is opposite to that of the second control switch.

12. The method of claim 11, wherein each of the sub-pixel comprises at least one third control switch, and a turned-on condition of the third control switch is the same as that of the second control switch;

when the touch display panel being in the display state, the second control switch and the third control switch are turned on, so that the first common electrode wiring provides the same electric potential to each of the touch sensing electrodes through the second control switch, and data line provides the display signal to the sub-pixel corresponding to the data line through the third control switch, and when the touch display panel being in the touch state, the second control switch and the third control switch are turned off, so that the first common electrode wiring is electrically insulated from each of the touch sensing electrodes and the data line is electrically insulated from the sub-pixel corresponding to the data line.

13. The method of claim 12, wherein a control terminal of the third control switch is electrically connected to the corresponding first scan line, and the display turning-on signal and the display turning-off signal are inputted through the first scan line to turn on or off the third control switch.

14. The method of claim 13, wherein the second scan line is disposed in the same layer as the first scan line.

15. The method of claim 13, further comprising:

when the touch display panel is powered off, generating and inputting a turning-on voltage signal to the first scan line and the second scan line to turn on the first control switch and the third control switch, so that the touch sensing electrode and the sub-pixel are discharged via the data line.

16. The method of claim 10, wherein the first common electrode wiring is provided at periphery of a display region on the substrate and formed in the same layer as the data lines or the first scan line.

17. The method of claim 16, wherein at least a portion of the second control switches are connected between the touch sensing electrode and the first common electrode wiring, and at least another portion of the second control switches are connected between at least adjacent two of the touch sensing electrodes.

18. The method of claim 10, wherein a common electrode comprising a plurality of the touch sensing electrodes are further disposed on the substrate.