TOUCH DISPLAY PANEL, TOUCH DISPLAY DEVICE AND DRVING METHOD THEREOF

• US 20140333572A1
• Filed: 09/12/2013
• Published: 11/13/2014
• Est. Priority Date: 05/13/2013
• Status: Active Grant

• Current Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Original Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Inventors: Hu, Chia-Wei
• Granted Patent: US 9,268,447 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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

A touch display panel including a first substrate, scan lines, data lines, a second substrate, a display medium, a second electrode set and a patterned-common-electrode layer is provided. The scan lines and the data lines are disposed on the first substrate and at least parts of the data lines form a first electrode set including first electrode subsets. The second substrate opposite to the first substrate has a top surface and a bottom surface facing the first substrate. The display medium is sandwiched between the first and the second substrates. The second electrode set disposed on the second substrate includes second electrode subsets arranged along a second direction intersected with the first direction. The patterned-common-electrode layer includes openings is disposed between the first and the second electrode sets. An orthogonal projection of the openings is overlapped with that of the first and the second electrode subsets.

Claims

1. A touch display panel, comprising:

a first substrate;

a plurality of scan lines, disposed on the first substrate;

a plurality of data lines, disposed on the first substrate and arranged along a first direction, each of the data lines crossing over the scan lines, and at least parts of the data lines forming a first electrode set, the first electrode set comprising a plurality of first electrode subsets;

a second substrate, disposed opposite to the first substrate and having a top surface and a bottom surface opposite to the top surface, the bottom surface facing the first substrate;

a display medium, sandwiched between the first substrate and the second substrate;

a second electrode set, disposed on the top surface of the second substrate, the second electrode set comprising a plurality of second electrode subsets arranged along a second direction intersected with the first direction; and

a patterned common electrode layer, disposed between the first electrode set and the second electrode set and comprising a plurality of openings, wherein an orthogonal projection of the openings on the first substrate is overlapped with an orthogonal projection of the first electrode subsets and the second electrode subsets on the first substrate.

2. The touch display panel as claimed in claim 1, wherein the patterned common electrode layer comprises a plurality of common electrodes arranged along a third direction, the openings comprising a plurality of gaps existing between the common electrodes, and an orthogonal projection of the gaps on the first substrate is overlapped with the orthogonal projection of the first electrode subsets and the second electrode subsets on the first substrate.

3. The touch display panel as claimed in claim 2, wherein the third direction is parallel to the second direction.

4. The touch display panel as claimed in claim 2, wherein an edge of each of the common electrodes comprises a plurality of concaves, each of the concaves is in comb-shaped corresponding to the first substrate subsets.

5. The touch display panel as claimed in claim 1, wherein a plurality of pixel voltage are respectively provided to the active devices by turns during a display driving period in a frame time, and a plurality of sensing voltages are respectively provided to the first electrode subsets by turns during a touch sensing period in the frame time.

6. The touch display panel as claimed in claim 1, wherein a plurality of sensing voltages are respectively provided to the second electrode subsets by turns during a touch sensing period in a frame time.

7. The touch display panel as claimed in claim 1, wherein a reference voltage is provided to the patterned common electrode layer during a display driving period.

8. The touch display panel as claimed in claim 1, wherein a reference voltage is provided to the patterned common electrode layer constantly.

9. A touch display device, comprising:

a touch display panel, comprising;

a first substrate;

a plurality of scan lines, disposed on the first substrate;

a plurality of data lines, disposed on the first substrate and arranged along a first direction, each of the data lines crossing over the scan lines, and at least parts of the data lines forming a first electrode set, the first electrode set comprising a plurality of first electrode subsets;

a plurality of active devices, each of the active devices coupled to one of the scan lines and one of the data lines;

a second substrate, disposed opposite to the first substrate and having a top surface and a bottom surface opposite to the top surface, the bottom surface facing the first substrate;

a display medium, sandwiched between the first substrate and the second substrate;

a second electrode set, disposed on the top surface of the second substrate, the second electrode set comprising a plurality of second electrode subsets arranged along a second direction intersected with the first direction; and

a patterned common electrode layer, disposed between the first electrode set and the second electrode set and comprising a plurality of openings, wherein the first electrode subsets are exposed to the second electrode subsets through the openings;

a driving module, coupled to the touch display panel and configured to provide a plurality of pixel voltages to the active devices during a display driving period in a frame period, and provide a plurality of sensing voltages to one of the first electrode set and the second electrode set during a touch sensing period in the frame period;

a sensing module, coupled to the touch display panel to receive signals from the other one of the first electrode set and second electrode set; and

a control unit, coupled to the driving module and the sensing module and configured to control the driving module and the sensing module.

10. The touch display panel as claimed in claim 9, wherein the patterned common electrode layer comprises a plurality of common electrodes arranged along a third direction, the openings comprising a plurality of gaps existing between the common electrodes, and an orthogonal projection of the gaps on the first substrate is overlapped with an orthogonal projection of the first electrode subsets and the second electrode subsets on the first substrate.

11. The touch display device as claimed in claim 10, wherein the third direction is parallel to the second direction.

12. The touch display device as claimed in claim 10, wherein an edge of each of the common electrodes comprises a plurality of concaves, each of the concaves is in comb-shaped corresponding to the first substrate subsets.

13. The touch display device as claimed in claim 9, wherein the control unit causes the driving module to respectively provide the pixel voltages to the active devices by turns during the display driving period and to stop providing the pixel voltages to the active devices during the touch sensing period.

14. The touch display device as claimed in claim 9, wherein the control unit causes the driving module to respectively provide the sensing voltages to the first electrode subsets by turns during the touch sensing period, and causes the sensing module to receive signals from the second electrode subsets.

15. The touch display device as claimed in claim 9, wherein the control unit causes the driving module to respectively provide the sensing voltages to the second electrode subsets by turns during the touch sensing period, and causes the sensing module to receive signals from the first electrode subsets.

16. The touch display device as claimed in claim 9, wherein the control unit causes the driving module to provide a reference voltage to the common electrodes during the display driving period.

17. The touch display device as claimed in claim 9, wherein the control unit causes the driving module to provide a reference voltage to the common electrodes constantly.

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

providing a plurality of pixel voltages to a plurality of active devices of the touch display panel during a display driving period in a frame period, wherein the touch display panel comprises a first substrate, a second substrate opposite to the first substrate, a plurality of scan lines, a plurality of data lines disposed on the first substrate and crossing over the scan lines, a second electrode set disposed on the second substrate, and a patterned common electrode layer disposed between the first electrode set and the second electrode set and comprising a plurality of openings, the first electrode set is exposed to the second electrode set through the openings;

driving one of the first electrode set and the second electrode set during a touch sensing period in the frame period; and

receiving a plurality of sensing signals from the other one of the first electrode set and second electrode set during the touch sensing period.

19. The driving method as claimed in claim 18, further comprising:

stopping to provide the pixel voltages to the active devices during the touch sensing period.

20. The driving method as claimed in claim 18, wherein the step of driving one of first electrode set and the second electrode set during the touch sensing period comprising:

providing a plurality of sensing voltages respectively to the first electrode subsets by turns during the touch sensing period.

21. The driving method as claimed in claim 20, wherein the step of receiving the sensing signals from the other one of the first electrode set and second electrode set during the touch sensing period comprising:

receiving the sensing signals respectively from the second electrode subsets during the touch sensing period.

22. The driving method as claimed in claim 18, further comprising providing a plurality of reference voltages respectively to the common electrodes during the display driving period.

23. The driving method as claimed in claim 18, further comprising providing a plurality of reference voltages respectively to the common electrodes constantly.