METHOD FOR DETECTING TOUCH POINTS OF TOUCH PANEL

• US 20150062072A1
• Filed: 03/07/2014
• Published: 03/05/2015
• Est. Priority Date: 08/30/2013
• Status: Abandoned Application

• Current Assignee: Tianjin Funayuanchuang Technology Co., Ltd.
• Original Assignee: Tianjin Funayuanchuang Technology Co., Ltd.
• Inventors: SHIH, PO-SHENG, CHENG, CHIEN-YUNG, CHAO, CHIH-HAN, CHENG, JIA-SHYONG
• Application Number:
  US14/200,038
• Publication Number:
  US 20150062072A1
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/0445 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: H03K 17/962 Capacitive touch switches
• CPC Class Codes: H03K 2017/9615 using three electrodes per touch switch
• CPC Class Codes: H03K 2217/9607 Capacitive touch switches

Abstract

A method for detecting a touch point of a touch panel is disclosed. A first driving signal is applied to a first conductive layer or a second conductive layer to obtain a capacitance variety ΔC₁ of a first capacitance value between the first conductive layer and the second conductive layer. A second driving signal is applied to a second conductive layer or a third conductive layer to obtain a capacitance variety ΔC₂ of a second capacitance value between the second conductive layer and the third conductive layer. If ΔC₂ is greater than a threshold value C₀, outputting a three-dimensional coordinate of the touch point; if ΔC₂ is less than or equal to the threshold value C₀, outputting a two-dimensional coordinate of the touch point.

Claims

1. A method for detecting a touch point of a touch panel,

the touch panel comprising:

a first electrode plate comprising a first conductive layer and a second conductive layer;

the first conductive layer comprising a plurality of first conductive channels aligned substantially along a first direction;

the second conductive layer comprising a plurality of second conductive channels aligned substantially along a second direction being crossed with the first direction, a first capacitance value being formed between the first conductive layer and the second conductive layer; and

a second electrode plate comprising a third conductive layer having a plurality of third conductive channels aligned substantially along a third direction being crossed with the second direction, a second capacitance value being formed between the third conductive layer and the second conductive layer, the second electrode plate being spaced from first electrode plate, and a distance between the first electrode plate and the second electrode plate being deformable;

the method comprising;

applying a first driving signal to one of the first conductive layer and the second conductive layer, and obtaining a capacitance change Δ

C₁ of the first capacitance from the other of the first conductive layer and the second conductive layer that the first driving signal is not applied thereon;

determining a two-dimensional coordinate of the touch point according to the capacitance variety Δ

C₁;

applying a second driving signal to one of the second conductive layer and the third conductive layer, and obtaining a capacitance change Δ

C₂ of the second capacitance from one of the second conductive layer and the third conductive layer; and

comparing Δ

C₂ with a threshold value C₀;

when Δ

C₂>

C₀, outputting a three-dimensional coordinate of the touch point;

when Δ

C₂ C₀, outputting the two-dimensional coordinate of the touch point.

2. The method as claimed in claim 1, wherein when the first driving signal is applied to one of the first conductive layer and the second conductive layer, and the third conductive layer is connected to ground or floating.

3. The method as claimed in claim 1, wherein when the second driving signal is applied to one of the second conductive layer and the third conductive layer, the first conductive layer is connected to ground, or floating.

4. The method as claimed in claim 1, wherein the first driving signal is applied to the second conductive layer, and the capacitance variety Δ

C₁ is obtained by scanning the first conductive layer.

5. The method as claimed in claim 4, wherein the first driving signal is applied to the plurality of second conductive channels one by one or at the same time.

6. The method as claimed in claim 5, wherein the first driving signal is applied to the plurality of second conductive channels one by one, and the other second conductive channels without the first driving signal applied thereon is connected to ground or floating.

7. The method as claimed in claim 1, wherein when the second driving signal is applied to one of the second conductive layer and the third conductive layer, and the capacitance variety Δ

C₂ is obtained by scanning the other of the second conductive layer and the third conductive layer the second driving signal is not applied thereon.

8. The method as claimed in claim 7, wherein the second driving signal is applied to the second conductive layer, and the capacitance variety Δ

C₁ is obtained by scanning the third conductive layer.

9. The method as claimed in claim 8, the second driving signal is applied to all of the plurality of second conductive channels or the second conductive channels having the touch points applied thereon one by one or at the same time.

10. The method as claimed in claim 9, wherein the second driving signal is applied to the second conductive channels having the touch points applied thereon one by one.

11. The method as claimed in claim 8, wherein the capacitance variety Δ

C₁ is obtained by scanning the all of the plurality of third conductive channels or the third conductive channels having the touch points applied thereon one by one or at the same time.

12. The method as claimed in claim 11, wherein the capacitance variety Δ

C₁ is obtained by scanning the third conductive channels having the touch points applied thereon one by one.

13. The method as claimed in claim 1, wherein when the second driving signal is applied to the second conductive layer or the third conductive layer, and the capacitance variety Δ

C₂ is obtained by scanning the second conductive layer or the third conductive layer with the second driving signal applied thereon.

14. The method as claimed in claim 1, wherein a pressure of the touch point is defined by the second capacitance value.

15. The method as claimed in claim 1, wherein when the capacitance variety Δ

C₂ reaches different predetermined values, a different third-dimensional coordinate of the touch point is outputted.

16. The method as claimed in claim 1, wherein the first direction is substantially perpendicular to the second direction.

17. The method as claimed in claim 16, wherein the third direction is substantially perpendicular to the second direction.

18. The method as claimed in claim 1, wherein the third direction is substantially parallel to the first direction.

19. The method as claimed in claim 1, wherein the touch panel further comprises an elastic electric insulative solid located between the first electrode plate and the second electrode plate.

20. The method as claimed in claim 1, wherein the touch panel further comprises a plurality of supporters located between the first electrode plate and the second electrode plate, and an interval is defined between the first electrode plate and the second electrode plate.