CAPACITIVE FORCE SENSING TOUCH PANEL

• US 20170075493A1
• Filed: 08/22/2016
• Published: 03/16/2017
• Est. Priority Date: 09/16/2015
• Status: Abandoned Application

• Current Assignee: Raydium Semiconductor Corporation
• Original Assignee: Raydium Semiconductor Corporation
• Inventors: Lin, Yi-Ying, LEE, Kun-Pei, Yang, Chen-Wei, Shieh, Hsin-Wei, Chiang, Chang-Ching
• Application Number:
  US15/242,712
• Publication Number:
  US 20170075493A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

A capacitive force sensing touch panel is disclosed. The capacitive force sensing touch panel includes pixels. A laminated structure of each pixel includes a first substrate, an anode layer, an OLED layer, a cathode layer, a second substrate, a first conductive layer and a second conductive layer. The anode layer is disposed above the first substrate. The OLED layer is disposed above the anode layer. The cathode layer is disposed above the OLED layer. The second substrate is disposed above the cathode layer. The first conductive layer and the second conductive layer are disposed on a first plane and a second plane above the OLED layer respectively and selectively driven to be a touch sensing electrode or force sensing electrode.

Claims

1. A capacitive force sensing touch panel, comprising:

a plurality of pixels, a laminated structure of each pixel comprising;

a first substrate;

an anode layer disposed above the first substrate;

an organic light-emitting diode (OLED) layer disposed above the anode layer;

a cathode layer disposed above the OLED layer;

a second substrate disposed above the cathode layer; and

a first conductive layer and a second conductive layer disposed on a first plane and a second plane above the OLED layer respectively and selectively driven to be a touch sensing electrode or a force sensing electrode.

2. The capacitive force sensing touch panel of claim 1, wherein the capacitive force sensing touch panel has an out-cell touch panel structure, an on-cell touch panel structure or an in-cell touch panel structure.

3. The capacitive force sensing touch panel of claim 1, wherein the first plane and the second plane are two planes of the same substrate or two planes of different substrates respectively, so that the first conductive layer disposed on the first plane and the second conductive layer disposed on the second plane form a mutual-capacitive structure.

4. The capacitive force sensing touch panel of claim 1, wherein the first plane is disposed under the second plane, the first plane is closer to the OLED layer than the second plane.

5. The capacitive force sensing touch panel of claim 1, wherein the laminated structure further comprises an elastic layer disposed between the first plane and the second plane, when the elastic layer is compressed and deformed by force, a distance between the first conductive layer disposed on the first plane and the second conductive layer disposed on the second plane is changed accordingly.

6. The capacitive force sensing touch panel of claim 1, wherein when the first conductive layer and the second conductive layer are driven to be the touch sensing electrode, the first conductive layer and the second conductive layer comprise at least one driving electrode and at least one sensing electrode respectively, the at least one driving electrode and the at least one sensing electrode receive a driving signal and a sensing signal respectively.

7. The capacitive force sensing touch panel of claim 1, wherein when the first conductive layer and the second conductive layer are driven to be the force sensing electrode, the first conductive layer comprises at least one driving electrode receiving a force sensing signal, a driving signal or a reference voltage, the second conductive layer comprises at least one sensing electrode receiving a ground level or a floating level.

8. The capacitive force sensing touch panel of claim 1, wherein when the first conductive layer and the second conductive layer are driven to be the touch sensing electrode, the first conductive layer comprises at least one driving electrode receiving a driving signal, the second conductive layer comprises at least one sensing electrode receiving a sensing signal and at least one dummy electrode receiving a floating level, the at least one sensing electrode and the at least one dummy electrode are spaced from each other.

9. The capacitive force sensing touch panel of claim 1, wherein when the first conductive layer and the second conductive layer are driven to be the force sensing electrode, the first conductive layer comprises at least one driving electrode receiving a force sensing signal, a driving signal or a reference voltage, the second conductive layer comprises at least one sensing electrode and at least one dummy electrode, the at least one sensing electrode and the at least one dummy electrode are spaced from each other and both receive a ground level or a floating level.

10. The capacitive force sensing touch panel of claim 1, wherein the first substrate and the second substrate are formed by a transparent material.

11. The capacitive force sensing touch panel of claim 1, wherein the laminated structure further comprises a cover lens, the cover lens is formed by a transparent material and disposed above the second substrate, the first conductive layer and the second conductive layer.

12. The capacitive force sensing touch panel of claim 1, wherein the second substrate is formed by an elastic material which can be compressed and deformed by force, the first conductive layer and the second conductive layer are disposed on a lower surface and an upper surface of the second substrate respectively.

13. The capacitive force sensing touch panel of claim 1, wherein a force sensing mode of the capacitive force sensing touch panel and a display mode of the capacitive force sensing touch panel are driven in a time-sharing way, the capacitive force sensing touch panel is operated in the force sensing mode during a blanking interval of a display period to drive the first conductive layer and the second conductive layer to be the force sensing electrode;

the capacitive force sensing touch panel is operated in the display mode and the force sensing mode simultaneously during a display interval of the display period.

14. The capacitive force sensing touch panel of claim 1, wherein a touch sensing mode and force sensing mode of the capacitive force sensing touch panel and a display mode of the capacitive force sensing touch panel are driven in a time-sharing way, the capacitive force sensing touch panel is operated in the touch sensing mode and the force sensing mode respectively during a blanking interval of a display period to drive the first conductive layer and the second conductive layer to be the touch sensing electrode and the force sensing electrode respectively.

15. The capacitive force sensing touch panel of claim 14, wherein the blanking interval comprises at least one of a vertical blanking interval (VBI), a horizontal blanking interval (HBI), and a long horizontal blanking interval, the long horizontal blanking interval has a time length equal to or larger than that of the horizontal blanking interval, the long horizontal blanking interval is obtained by redistributing a plurality of the horizontal blanking interval or the long horizontal blanking interval comprises the vertical blanking interval.

16. The capacitive force sensing touch panel of claim 1, wherein the second substrate is an encapsulation layer, the second conductive layer is disposed above the first conductive layer, the laminated structure further comprises an elastic layer disposed between the cathode layer and the first conductive layer, when the elastic layer is compressed and deformed by force, a distance between the first conductive layer disposed above the elastic layer and the cathode layer disposed under the elastic layer is changed accordingly, but a distance between the first conductive layer and the second conductive layer is not changed.

17. The capacitive force sensing touch panel of claim 16, wherein the first conductive layer is driven to be force sensing electrodes and the second conductive layer is driven to be touch sensing electrodes.

18. The capacitive force sensing touch panel of claim 16, wherein when a force is provided to the laminated structure, the second conductive layer is used to shield the first conductive layer.

19. The capacitive force sensing touch panel of claim 16, wherein the elastic layer is formed by at least one compressible spacer.

20. The capacitive force sensing touch panel of claim 17, wherein there is a specific proportion between a number of the force sensing electrodes formed by the first conductive layer and a number of the touch sensing electrodes formed by the second conductive layer.

21. The capacitive force sensing touch panel of claim 17, wherein conducting pads are disposed on the first conductive layer driven to be the force sensing electrodes and the second conductive layer driven to be the touch sensing electrodes respectively and the conducting pads are electrically connected with conduct bars to transmit force sensing signals and touch sensing signals respectively.

22. The capacitive force sensing touch panel of claim 17, wherein the first conductive layer driven to be the force sensing electrodes is formed by transparent conductive material, and the first conductive layer is divided into blocks partially overlapping a display area of the OLED layer.

23. The capacitive force sensing touch panel of claim 17, wherein the first conductive layer driven to be the force sensing electrodes is formed by conductive material and disposed above the OLED layer in mesh type without overlapping a display area of the OLED layer.

24. The capacitive force sensing touch panel of claim 16, wherein the first conductive layer and the second conductive layer are disposed on a lower surface and an upper surface of the second substrate respectively.

25. The capacitive force sensing touch panel of claim 16, wherein the second conductive layer is disposed on a lower surface of the second substrate and the first conductive layer is disposed between the second conductive layer and the cathode layer.

26. The capacitive force sensing touch panel of claim 1, wherein when the capacitive force sensing touch panel is operated in a touch sensing mode, the capacitive force sensing touch panel drives the second conductive layer to be touch sensing electrodes and maintains the first conductive layer at a fixed voltage to pretend touch sensing of the touch sensing electrodes from noise interference.

27. The capacitive force sensing touch panel of claim 1, wherein when the capacitive force sensing touch panel is operated in a force sensing mode, the capacitive force sensing touch panel drives the first conductive layer to be force sensing electrodes and maintains the second conductive layer at a fixed voltage to pretend force sensing of the force sensing electrodes from noise interference and to shield the force sensing electrodes.

28. The capacitive force sensing touch panel of claim 1, wherein the capacitive force sensing touch panel drives the first conductive layer and the second conductive layer to be force sensing electrodes and touch sensing electrodes respectively with the same amplitude, the same phase or the same frequency to reduce driving loading without decreasing a force sensing time and a touch sensing time.

29. The capacitive force sensing touch panel of claim 1, wherein a touch sensing period and a display interval of the capacitive force sensing touch panel are at least partially overlapped;

during the touch sensing period, the capacitive force sensing touch panel drives the second conductive layer to be touch sensing electrodes and maintains the first conductive layer at a fixed voltage.

30. The capacitive force sensing touch panel of claim 1, wherein a force sensing period and a display interval of the capacitive force sensing touch panel are at least partially overlapped.

31. A capacitive force sensing touch panel, comprising:

a plurality of pixels, a laminated structure of each pixel comprising;

a first substrate;

an anode layer disposed above the first substrate;

an organic light-emitting diode (OLED) layer disposed above the anode layer;

a cathode layer disposed above the OLED layer;

a second substrate disposed above the cathode layer; and

a conductive layer disposed under the OLED layer and driven to be a force sensing electrode.

32. The capacitive force sensing touch panel of claim 31, wherein the capacitive force sensing touch panel has an out-cell touch panel structure, an on-cell touch panel structure or an in-cell touch panel structure.

33. The capacitive force sensing touch panel of claim 31, wherein the conductive layer forms a single-layer self-capacitive structure or a single-layer mutual-capacitive structure.

34. The capacitive force sensing touch panel of claim 31, wherein the conductive layer is formed by transparent material or opaque material.

35. The capacitive force sensing touch panel of claim 31, further comprises an elastic layer disposed between the cathode layer and the conductive layer, when the elastic layer is compressed and deformed by force, a distance between the conductive layer and the cathode layer is changed accordingly.

36. The capacitive force sensing touch panel of claim 35, wherein the elastic layer is replaced by an air.

37. The capacitive force sensing touch panel of claim 31, wherein the conductive layer is disposed on a lower surface of the first substrate.

38. The capacitive force sensing touch panel of claim 31, wherein the first substrate is formed by an elastic material which can be compressed and deformed by force.

39. The capacitive force sensing touch panel of claim 31, further comprising a third substrate disposed under the first substrate, and the conductive layer is disposed on an upper surface of the third substrate.

40. The capacitive force sensing touch panel of claim 39, further comprises an elastic layer disposed between the first substrate and the third substrate, when the elastic layer is compressed and deformed by force, a distance between the cathode layer and the conductive layer is changed accordingly.

41. The capacitive force sensing touch panel of claim 40, wherein the elastic layer is replaced by an air.

42. The capacitive force sensing touch panel of claim 31, wherein a force sensing mode of the capacitive force sensing touch panel and a touch sensing mode or a display mode of the capacitive force sensing touch panel are driven in a time-sharing way.

43. The capacitive force sensing touch panel of claim 31, wherein a force sensing mode of the capacitive force sensing touch panel and a touch sensing mode or a display mode of the capacitive force sensing touch panel are driven simultaneously.

44. The capacitive force sensing touch panel of claim 31, further comprising a shielding electrode disposed above the conductive layer, when the conductive layer is driven to be force sensing electrodes, the shielding electrode is a reference electrode or a ground electrode.