Touch input device

• US 9,575,586 B2
• Filed: 01/29/2016
• Issued: 02/21/2017
• Est. Priority Date: 09/19/2014
• Status: Active Grant

• Current Assignee: HiDeep Inc.
• Original Assignee: HiDeep Inc.
• Inventors: Kim, Seyeob, Yoon, Sangsic, Kwon, Sunyoung, Moon, Hojun, Kim, Taehoon
• Primary Examiner(s): PATEL, PREMAL R
• Application Number:
  US15/009,973
• Publication Number:
  US 20160147341A1
• Time in Patent Office: 389 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 1/1626 with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• CPC Class Codes: G06F 1/1637 Details related to the display arrangement, including those related to the mounting of the display in the housing
• CPC Class Codes: G06F 1/1643 the display being associated to a digitizer, e.g. laptops that can be used as penpads details related to the relative motion of the display enclosure with respect to the body enclosure, e.g. to move between laptop and tablet PC configuration G06F1/1615
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• 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 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• 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 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: H04M 2250/22 including a touch pad, a touch sensor or a touch detector digitizers for touch screens G06F3/041

Abstract

A touch input device capable of detecting a pressure of a touch on a touch surface includes: a display module and a pressure electrode. The display module includes a display panel and a reference potential layer. An electrical signal, which is changed according to a capacitance between the pressure electrode and the reference potential layer, is detected from the pressure electrode and the capacitance changes depend on a change of a relative distance between the pressure electrode and the reference potential layer, such that the pressure of the touch is detected based on the capacitance.

Claims

1. A touch input device capable of detecting a pressure of a touch on a touch surface, the touch input device comprising:

a display panel; and

a pressure electrode which is directly formed on the display panel;

wherein the display panel comprises a reference potential layer therein;

wherein an electrical signal which is changed according to a capacitance between the pressure electrode and the reference potential layer is detected from the pressure electrode;

wherein the capacitance changes depending on a change of a relative distance between the pressure electrode and the reference potential layer; and

wherein the pressure of the touch is detected based on the capacitance.

2. The touch input device of claim 1, wherein the pressure electrode is directly formed on a bottom surface of the display panel.

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

4. The touch input device of claim 1, wherein, when the pressure is applied, the display panel is bent, and wherein the distance between the pressure electrode and the reference potential layer is changed by the bending of the display panel.

5. The touch input device of claim 1, wherein the pressure electrode constitutes a plurality of channels.

6. A touch input device capable of detecting a pressure of a touch on a touch surface, the touch input device comprising:

a display panel; and

a pressure electrode which is integrally formed with the display panel;

wherein the display panel comprises a reference potential layer therein;

wherein an electrical signal which is changed according to a capacitance between the pressure electrode and the reference potential layer is detected from the pressure electrode;

wherein the capacitance changes depending on a change of a relative distance between the pressure electrode and the reference potential layer; and

wherein the pressure of the touch is detected based on the capacitance.

7. The touch input device of claim 6, wherein the pressure electrode is integrally formed with a bottom surface of the display panel.

8. The touch input device of claim 6, wherein the pressure electrode is formed by positioning a mask having a through-hole corresponding to a pattern of the pressure electrode, and then by spraying a conductive material.

9. The touch input device of claim 6, wherein, when the pressure is applied, the display panel is bent, and wherein the distance between the pressure electrode and the reference potential layer is changed by the bending of the display panel.

10. The touch input device of claim 6, wherein the pressure electrode constitutes a plurality of channels.

11. A touch input device capable of detecting a pressure of a touch on a touch surface, the touch input device comprising:

a display panel; and

a pressure electrode printed on the display panel;

wherein the display panel comprises a reference potential layer therein;

wherein an electrical signal which is changed according to a capacitance between the pressure electrode and the reference potential layer is detected from the pressure electrode;

wherein the capacitance changes depending on a change of a relative distance between the pressure electrode and the reference potential layer; and

wherein the pressure of the touch is detected based on the capacitance.

12. The touch input device of claim 11, wherein the pressure electrode is printed on a bottom surface of the display panel.

13. The touch input device of claim 11, wherein the pressure electrode is formed by positioning a mask having a through-hole corresponding to a pattern of the pressure electrode, and then by spraying a conductive material.

14. The touch input device of claim 11, wherein, when the pressure is applied, the display panel is bent, and wherein the distance between the pressure electrode and the reference potential layer is changed by the bending of the display panel.

15. The touch input device of claim 11, wherein the pressure electrode constitutes a plurality of channels.

16. A touch input device capable of detecting a pressure of a touch on a touch surface, the touch input device comprising:

a display panel; and

a pressure electrode patterned on the display panel;

wherein the display panel comprises a reference potential layer therein;

wherein an electrical signal which is changed according to a capacitance between the pressure electrode and the reference potential layer is detected from the pressure electrode;

wherein the capacitance changes depending on a change of relative distance between the pressure electrode and the reference potential layer; and

wherein the pressure of the touch is detected based on the capacitance.

17. The touch input device of claim 16, wherein the pressure electrode is printed in the form of a pattern on the display panel.

18. The touch input device of claim 16, wherein the pressure electrode is printed in the form of a pattern on a bottom surface of the display panel.

19. The touch input device of claim 16, wherein the pressure electrode is formed by positioning a mask having a through-hole corresponding to a pattern of the pressure electrode, and then by spraying a conductive material.

20. The touch input device of claim 16, wherein, when the pressure is applied, the display panel is bent, and wherein the distance between the pressure electrode and the reference potential layer is changed by the bending of the display panel.