Touch input device which detects a magnitude of a touch pressure

Patent metadata

Field	Value
Publication number	US-9804703-B2
Application number	US-201715409642-A
Country	US
Kind code	B2
Filing date	Jan 19, 2017
Priority date	Sep 19, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

In one embodiment, a touch input device includes a cover layer; a touch sensor; a display panel which is located under the cover layer; a pressure electrode which is located under the display panel; and a first converter which converts a signal comprising information for electrical characteristics outputted from the pressure electrode to a digital signal; wherein a driving signal is applied to the touch sensor and a touch position is detected from a sensing signal which is outputted from the touch sensor; and wherein a magnitude of a touch pressure is detected from the digital signal converted by the first converter.

First claim

What is claimed is:

1. A touch input device comprising:
a cover layer;
a touch sensor;
a display panel which is located under the cover layer;
a pressure electrode which is located under the display panel; and
a first converter which converts an analogue signal to a digital signal, the analogue signal comprising information for electrical characteristics outputted from the pressure electrode;
wherein a driving signal is applied to the touch sensor and a touch position is detected from a sensing signal which is outputted from the touch sensor;
wherein a magnitude of a touch pressure is detected from the digital signal converted by the first converter; and
wherein the sensing signal is passed through an integrator or an amplifier and then is converted into a digital signal by a second converter, the second converter being separate from the first converter.

2. The touch input device of claim 1 , wherein the cover layer and the display panel are bent according to the touch.

3. The touch input device of claim 1 , further comprising a spacer layer located in at least one place among a place between the pressure electrode and a shielding member located under the pressure electrode and a place between the pressure electrode and the display panel.

4. The touch input device of claim 3 ,
wherein the shielding member is a reference potential layer;
wherein the electrical characteristics comprise capacitance; and
wherein the capacitance changes depending on a distance between the pressure electrode and the reference potential layer.

5. The touch input device of claim 4 , wherein the distance between the pressure electrode and the reference potential layer is changed as the display panel bends.

6. The touch input device of claim 3 ,
wherein a reference potential layer is located within the display panel;
wherein the electrical characteristics comprise capacitance; and
wherein the capacitance changes depending on a distance between the pressure electrode and the reference potential layer.

7. The touch input device of claim 6 , wherein the distance between the pressure electrode and the reference potential layer is changed as the display panel bends.

8. The touch input device of claim 1 , wherein the display panel is a LCD panel or OLED panel.

9. The touch input device of claim 1 , wherein the pressure electrode comprises a plurality of electrodes constituting a plurality of channels.

10. The touch input device of claim 9 , wherein the touch input device detects a pressure of each touch of a multi touch by using the plurality of channels.

11. The touch input device of claim 1 , wherein the pressure electrode is formed as a sheet.

12. The touch input device of claim 1 , wherein the touch position is detected from the digital signal converted by the second converter.

13. A touch input device comprising:
a cover layer;
a touch sensor;
a display panel which is located under the cover layer;
a pressure electrode which is located under the display panel;
a first converter which converts an analogue signal to a digital signal, the analogue signal comprising information for electrical characteristics outputted from the pressure electrode;
a drive unit which applies a driving signal to the touch sensor;
a sensing unit which receives a sensing signal from the touch sensor and detects a touch position; and
a pressure detector which detects a magnitude of a touch pressure from the digital signal converted by the first converter;
wherein the first converter and the pressure detector are provided as separate components; and
wherein the sensing signal is passed through an integrator or an amplifier and then is converted into a digital signal by a second converter, the second converter being separate from the first converter.

14. The touch input device of claim 13 , wherein the cover layer and the display panel are bent according to the touch.

15. The touch input device of claim 13 , further comprising a spacer layer located in at least one place among a place between the pressure electrode and a shielding member located under the pressure electrode and a place between the pressure electrode and the display panel.

16. The touch input device of claim 15 ,
wherein the shielding member is a reference potential layer;
wherein the electrical characteristics comprise capacitance; and
wherein the capacitance changes depending on a distance between the pressure electrode and the reference potential layer.

17. The touch input device of claim 16 , wherein the distance between the pressure electrode and the reference potential layer is changed as the display panel bends.

18. The touch input device of claim 15 ,
wherein a reference potential layer is located within the display panel;
wherein the electrical characteristics comprise capacitance; and
wherein the capacitance changes depending on a distance between the pressure electrode and the reference potential layer.

19. The touch input device of claim 18 , wherein the distance between the pressure electrode and the reference potential layer is changed as the display panel bends.

20. The touch input device of claim 13 , wherein the display panel is a LCD panel or OLED panel.

21. The touch input device of claim 13 , wherein the pressure electrode comprises a plurality of electrodes constituting a plurality of channels.

22. The touch input device of claim 21 , wherein the touch input device detects a pressure of each touch of a multi touch by using the plurality of channels.

23. The touch input device of claim 13 , wherein the pressure electrode is formed as a sheet.

24. The touch input device of claim 13 , wherein the touch position is detected from the digital signal converted by the second converter.

Assignees

• Hideep Inc

Inventors

• Kim Bonkee
• Kim Seyeob
• Yoon Sangsic
• Kwon Sunyoung
• Moon Hojun
• Kim Taehoon

Classifications

• H04M2250/22

  including a touch pad, a touch sensor or a touch detector · CPC title

• G06F2203/04104

  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 title

• H04M1/0266 Primary

  for a display module assembly · CPC title

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title

• G06F3/044

  by capacitive means · CPC title