Touch input device

• US 10,474,271 B2
• Filed: 02/04/2015
• Issued: 11/12/2019
• Est. Priority Date: 08/01/2014
• Status: Active Grant

• Current Assignee: HiDeep Inc.
• Original Assignee: HiDeep Inc.
• Inventors: Kim, Seyeob, Yoon, Sangsic, Kwon, Sunyoung, Moon, Hojun, Kim, Taehoon, Kim, Bonkee
• Primary Examiner(s): Wills-Burns, Chineyere D
• Application Number:
  US14/614,086
• Publication Number:
  US 20160034087A1
• Time in Patent Office: 1,742 Days
• Field of Search: 345173
• 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 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells

Abstract

A touch input device capable of detecting a pressure of a touch on a touch surface may be provided that includes a substrate and a display module. The touch input device further includes an electrode which is disposed at a position where a distance between the electrode and a reference potential layer is changed by the touch on the touch surface. The distance may be changed depending on a magnitude of a pressure of the touch. The electrode outputs an electrical signal according to the change of the distance. A spacer layer is disposed between the reference potential layer and the electrode.

Claims

1. A touch input device which detects a pressure of a touch on a touch surface, the touch input device comprising:

a display module;

a substrate for blocking electrical noise or for separating the display module from a circuit board or battery for operation of the touch input device; and

an electrode which is disposed at a position where a distance between the electrode and a reference potential layer is changed by the touch on the touch surface,

wherein a spacer layer is disposed between the reference potential layer and the electrode,

wherein a pressure magnitude of the touch is detected based on a capacitance detected from the electrode, and the capacitance is changed depending on the distance between the electrode and the reference potential layer,

wherein the display module is bent by the touch, and the distance between the electrode and the reference potential layer is changed due to the bending of the display module,

wherein the reference potential layer is the substrate or the display module or is positioned within the display module,

wherein, when the reference potential layer is the substrate, the electrode is disposed on a bendable surface of the display module,

wherein the spacer layer is maintained with a predetermined thickness only by a supporting structure which is made of inelastic material and located only in an edge portion of the substrate, and

wherein the supporting structure is located between the display module and the substrate which is under the display module.

2. The touch input device of claim 1, wherein the electrode is formed on the substrate or on the display module.

3. The touch input device of claim 2,

wherein the electrode is positioned between a first insulation layer and a second insulation layer, and the electrode, together with the first insulation layer and the second insulation layer, is fixed as an integral electrode sheet to the substrate or to the display module, and

wherein the substrate or the display module to which the electrode is fixed is the reference potential layer.

4. The touch input device of claim 2,

wherein the electrode is positioned between a first insulation layer and a second insulation layer, and the electrode, together with the first insulation layer and the second insulation layer, is fixed as an integral electrode sheet to the substrate or to the display module, and

wherein the substrate or the display module to which the electrode is fixed is the reference potential layer.

5. The touch input device of claim 1,

wherein the electrode comprises a first electrode and a second electrode.

6. The touch input device of claim 5, wherein the first electrode and the second electrode are formed on the substrate, or the first electrode and the second electrode are formed on the display module.

7. The touch input device of claim 1, wherein the electrode is formed by positioning a mask which has a through-hole corresponding to a pattern of the electrode, and then by spraying a conductive material.

8. The touch input device of claim 1, further comprising:

a touch sensor panel which detects a position of the touch when the touch occurs on the touch surface; and

a first printed circuit board on which a touch sensing circuit for the operation of the touch sensor panel has been mounted,

wherein the touch sensor panel is adhered to a surface of the display module, which is opposite to the substrate.

9. The touch input device of claim 8,

wherein the display module further comprises a second printed circuit board on which a control circuit for the operation of the display panel has been mounted,

wherein the electrode is formed on an additional circuit board,

further comprising a connector between the additional circuit board and the first printed circuit board,

wherein the electrode is electrically connected to the touch sensing circuit through the connector.

10. The touch input device of claim 8,

wherein the display module further comprises a second printed circuit board on which a control circuit for the operation of the display panel has been mounted,

wherein the electrode is formed on an additional circuit board,

further comprising:

a first connector between the first printed circuit board and the second printed circuit board;

a second connector between the second printed circuit board and a main board on which a central processing unit for the operation of the touch input device has been mounted; and

a third connector between the additional circuit board and the main board,

wherein the electrode is electrically connected to the touch sensing circuit through the first connector, the second connector and the third connector.

11. The touch input device of claim 1, wherein the display module further comprises a second printed circuit board on which a control circuit for the operation of the display panel has been mounted, and wherein the electrode is printed on the second printed circuit board.

12. The touch input device of claim 11, further comprising:

a touch sensor panel which detects a position of the touch when the touch occurs on the touch surface; and

a first printed circuit board on which a touch sensing circuit for the operation of the touch sensor panel has been mounted,

wherein the touch sensor panel is adhered to a surface of the display module, which is opposite to the substrate, and

further comprising a connector between a first printed circuit board and the second printed circuit board,

wherein the electrode is electrically connected to the touch sensing circuit through the connector.

13. The touch input device of claim 1, wherein the display module further comprises a second printed circuit board on which a control circuit for the operation of the display panel has been mounted, and wherein the electrode is attached to the display module in such a manner as to be electrically connected to a conductive pattern printed on the second printed circuit board.

14. The touch input device of claim 13, further comprising:

a touch sensor panel which detects a position of the touch when the touch occurs on the touch surface; and

a first printed circuit board on which a touch sensing circuit for the operation of the touch sensor panel has been mounted,

wherein the touch sensor panel is adhered to a surface of the display module, which is opposite to the substrate, and

further comprising a connector between a first printed circuit board and the second printed circuit board,

wherein the electrode is electrically connected to the touch sensing circuit through the connector.

15. The touch input device of claim 1, wherein the electrode comprises a plurality of channels.

16. The touch input device of claim 15, wherein a pressure of each of multi touches is detected by using the plurality of channels.

17. The touch input device of claim 1, wherein the spacer layer comprises an air gap located in a center portion of the substrate, and the air gap is maintained with the predetermined thickness in the center portion only by the supporting structure located only in the edge portion of the substrate.

18. A touch input device which detects a pressure of a touch on a touch surface, the touch input device comprising:

a display module;

a substrate for blocking electrical noise or for separating the display module from a circuit board or battery for operation of the touch input device; and

a first electrode disposed on the display module and a second electrode disposed on the substrate,

wherein a spacer layer is disposed between the first electrode and the second electrode,

wherein a pressure magnitude of the touch is detected based on a capacitance between the first electrode and the second electrode, and the capacitance is changed depending on the distance between the first electrode and the second electrode,

wherein the display module is bent by the touch, and the distance between the first electrode and the second electrode is changed due to the bending of the display module,

wherein the first electrode is disposed on a bendable surface of the display module,

wherein the spacer layer is maintained with a predetermined thickness only by a supporting structure which is made of inelastic material and located only in an edge portion of the substrate, and

wherein the supporting structure is located between the display module and the substrate which is under the display module.

19. The touch input device of claim 18, wherein each of the first electrode and second electrode constitutes a plurality of channels.

20. The touch input device of claim 19, wherein a pressure of each of multi touches is detected by using the plurality of channels.

21. The touch input device of claim 18, wherein the spacer layer comprises an air gap located in a center portion of the substrate, and the air gap is maintained with the predetermined thickness in the center portion only by the supporting structure located only in the edge portion of the substrate.

22. A touch input device which detects a pressure of a touch on a touch surface, the touch input device comprising:

a display module;

a substrate for blocking electrical noise or for separating the display module from a circuit board or battery for operation of the touch input device; and

an electrode which is disposed at a position where a distance between the electrode and a reference potential layer is changed by the touch on the touch surface,

wherein a spacer layer is disposed between the reference potential layer and the electrode,

wherein a pressure magnitude of the touch is detected based on a capacitance detected from the electrode, and the capacitance is changed depending on the distance between the electrode and the reference potential layer,

wherein the display module or the substrate is bent by the touch, and the distance between the electrode and the reference potential layer is changed due to the bending of the display module or the substrate,

wherein the reference potential layer is the display module or the substrate,

wherein the electrode is formed on the substrate or on the display module,

wherein the spacer layer is maintained with a predetermined thickness only by a supporting structure which is made of inelastic material and located only in an edge portion of the substrate, and

wherein the supporting structure is located between the display module and the substrate which is under the display module.

23. The touch input device of claim 22, wherein the touch surface is at least one of a top surface of the display module and a bottom surface of the substrate.

24. The touch input device of claim 22, wherein the spacer layer comprises an air gap located in a center portion of the substrate, and the air gap is maintained with the predetermined thickness in the center portion only by the supporting structure located only in the edge portion of the substrate.