Touch display panel, and driving method and driving circuit for the same

• US 9,766,744 B2
• Filed: 10/13/2015
• Issued: 09/19/2017
• Est. Priority Date: 04/01/2015
• 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: Li, Gujun, Sun, Yungang
• Primary Examiner(s): Nguyen, Kevin M
• Application Number:
  US14/881,953
• Publication Number:
  US 20160291772A1
• Time in Patent Office: 707 Days
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/04164 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 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

It is provided a touch display panel, and a driving method and a driving circuit for the touch display panel. The touch display panel includes: a common electrode including multiple common electrode units disposed in rows and columns; multiple switch elements electrically connected to the common electrode units; multiple first signal lines, where each first signal line is electrically connected to at least two switch elements located in different columns, and multiple first signal lines are used to turn on or turn off the switch elements electrically connected to the first signal lines; and multiple second signal lines, where each second signal line is electrically connected to at least two switch elements located in different rows, and the multiple second signal lines are used to provide a driving signal to a common electrode unit electrically connected to a turned-on switch element.

Claims

1. A touch display panel, comprising:

a common electrode comprising a plurality of common electrode elements arranged in rows and columns;

a plurality of switch elements, wherein an one-to-one correspondence exists between the switch elements and the common electrode elements, and each switch element is electrically connected to one common electrode element corresponding to the each switch element;

a plurality of first signal lines, wherein each first signal line is electrically connected to at least two switch elements located in different columns, and the plurality of first signal lines are configured to turn on or turn off the switch elements electrically connected to the first signal lines; and

a plurality of second signal lines, wherein each second signal line is electrically connected to at least two switch elements located in different rows, and the plurality of second signal lines are configured to provide a driving signal to a common electrode element electrically connected to a turned-on switch element.

2. The touch display panel according to claim 1, wherein the switch elements are thin-film transistors and each thin-film transistor comprises a first electrode, a second electrode and a gate electrode.

3. The touch display panel according to claim 2, wherein the common electrode comprises common electrode elements arranged in N rows and M columns and each first signal line is electrically connected to gate electrodes of M thin-film transistors.

4. The touch display panel according to claim 3, wherein each first signal line is electrically connected to gate electrodes of M thin-film transistors which are located in the same row.

5. The touch display panel according to claim 4, wherein each second signal line is electrically connected to second electrodes of N thin-film transistors.

6. The touch display panel according to claim 5, wherein each second signal line is electrically connected to second electrodes of N thin-film transistors which are located in the same column.

7. A driving method for a touch display panel, wherein the touch display panel, comprises:

a common electrode comprising a plurality of common electrode elements arranged in rows and columns;

a plurality of switch elements, wherein an one-to-one correspondence exists between the switch elements and the common electrode elements, and each switch element is electrically connected to one common electrode element corresponding to the each switch element;

a plurality of first signal lines, wherein each first signal line is electrically connected to at least two switch elements located in different columns, and plurality of first signal lines are configured to turn on or turn off the switch elements electrically connected to the first signal lines; and

a plurality of second signal lines, wherein each second signal line is electrically connected to at least two switch elements located in different rows, and the plurality of second signal lines are configured to provide a driving signal to a common electrode element electrically connected to a turned-on switch element; and

wherein the method comprises;

providing, in a display phase, driving signals to the plurality of first signal lines simultaneously to turn on the plurality of switch elements;

providing, in the display phase, common voltage signals to the plurality of second signal lines simultaneously to achieve a display function; and

providing, in a touch phase, driving signals to the plurality of first signal lines row by row to turn on switch elements electrically connected to the first signal lines row by row;

providing, in the touch phase, touch signals to the plurality of second signal lines simultaneously to achieve a touch function.

8. The driving method for the touch display panel according to claim 7, wherein the first signal line comprises a first sub-line and a second sub-line, and driving signals are provided to the first and second sub-lines simultaneously in the touch phase in a case that the switch elements electrically connected to the first sub-line and the switch elements electrically connected to the second sub-line are located in different columns.

9. The driving method for the touch display panel according to claim 7, wherein in a case that each first signal line is electrically connected to switch elements located in the same row, driving signals are provided to the plurality of first signal lines row by row to turn on switch elements row by row in the touch phase.

10. A driving circuit for a touch display panel, wherein the touch display panel comprises:

a common electrode comprising a plurality of common electrode elements arranged in rows and columns;

a plurality of switch elements, wherein an one-to-one correspondence exists between the switch elements and the common electrode elements, and each switch element is electrically connected to one common electrode element corresponding to the each switch element;

a plurality of first signal lines, wherein each first signal line is electrically connected to at least two switch elements located in different columns, and plurality of first signal lines are configured to turn on or turn off the switch elements electrically connected to the first signal lines; and

a plurality of second signal lines, wherein each second signal line is electrically connected to at least two switch elements located in different rows, and the plurality of second signal lines are configured to provide a driving signal to a common electrode element electrically connected to a turned-on switch element;

wherein the driving circuit comprises;

a driving circuit for first signal lines, configured to provide driving signals to the plurality of first signal lines to turn on the plurality of switch elements in a display phase, and to provide driving signals to the plurality of first signal lines row by row to turn on switch elements electrically connected to the first signal lines row by row in a touch phase; and

a driving circuit for second signal lines, configured to provide common voltage signals to the plurality of second signal lines simultaneously in the display phase and to provide touch signals to the plurality of second signal lines simultaneously in the touch phase.

11. The driving circuit for the touch display panel according to claim 10, wherein the driving circuit for the first signal lines comprises:

a plurality of first signal sources, wherein there is a one-to-one correspondence between the plurality of first signal sources and the first signal lines, and the first signal sources are configured to provide driving signals to the first signal lines electrically connected to the first signal sources.

12. The driving circuit for the touch display panel according to claim 10, wherein the driving circuit for the first signal lines comprises:

a triggering signal source; and

a control circuit, comprising a first stage of shift register to a P-th stage of shift register, wherein P is the number of the first signal lines in the touch display panel,

wherein an input terminal of the first stage of shift register is electrically connected to the triggering signal source, the first stage shift of register operates in response to a triggering signal from the triggering signal source and provides a driving signal to a first signal line electrically connected to the first stage of shift register; and

an output terminal of an I-th stage of shift register is electrically connected to an input terminal of an (I+1)-th stage of shift register to trigger the (I+1)-th stage of shift register to operate, and the I-th stage of shift register provides a driving signal to a first signal line electrically connected to the I-th stage of shift register;

where I is not less than 1 and less than P.