Self-capacitive touch device and calculation method thereof

• US 10,372,273 B2
• Filed: 07/21/2015
• Issued: 08/06/2019
• Est. Priority Date: 07/21/2014
• Status: Active Grant

• Current Assignee: Ili Technology Corp. (MediaTek, Inc.)
• Original Assignee: Ili Technology Corp. (MediaTek, Inc.)
• Inventors: Ding, Peng-Yun, Lee, Ping-Hwan
• Primary Examiner(s): Xie, Kwin
• Application Number:
  US14/804,421
• Publication Number:
  US 20160018927A1
• Time in Patent Office: 1,477 Days
• Field of Search: 345173-174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 2203/04105 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2310/0202 Addressing of scan or signal lines
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A self-capacitive touch device includes a transparent substrate, multiple sensing electrodes and multiple trace lines. The sensing electrodes are alternately disposed on the transparent substrate, and each of the sensing units has a polygonal planar contour having M sides, where M is a positive integer equal to or greater than 4. A side of each of the sensing electrodes corresponds to sides of at least two of the remaining sensing electrodes. The trace lines are electrically connected to the sensing electrodes in a way that a part of segments of the trace lines are disposed in an active region of the self-capacitive touch device.

Claims

1. A self-capacitive touch device, having an active region with at least an arched edge, comprising:

a transparent substrate;

a plurality of sensing electrodes, disposed on the transparent substrate in a most densely stacked arrangement and leaving minimum space without coverage at the arched edge of the active region, each of the sensing electrodes has one side substantially parallel and adjacent to one side of an adjacent sensing electrode of the sensing electrodes, each sensing electrode having a convex polygon shape with more than four sides, wherein at least two sides of each of the sensing electrodes align with sides of at least two of the remaining sensing electrodes; and

a plurality of trace lines, respectively electrically connected to the sensing electrodes, a part of segments of the trace lines being disposed in the active region,

wherein the trace lines are entirely disposed between the sensing electrodes, and each sensing electrode is coupled to only one trace line,

wherein each of the internal connecting portions is connected to a vertex of one of the sensing electrodes,

wherein each of the trace lines is connected to a corresponding contact pad, and the corresponding contact pad of each of the trace lines is located in a contact pad region disposed at a single side of the sensing electrodes,

wherein the trace lines comprise a plurality of bend points, and number of the bend points of each of the trace lines increases with distance between the each of the trace lines and corresponding contact pad, wherein at least one part of the bend points of the part of segments of the trace lines being disposed in the active region have same bending angle, and the bending angle is 120 degrees.

2. The self-capacitive touch device according to claim 1, wherein the active region comprises at least one arched side.

3. The self-capacitive touch device according to claim 1, wherein the active region has a circular or ellipsoidal planar contour.

4. The self-capacitive touch device according to claim 1, further comprising:

a border region, surrounding the active region;

a plurality of border sensing electrodes, disposed along an intersection of the active region and the border region;

wherein, each of the border sensing electrodes has an equally proportioned regular polygonal planar contour obtained from dividing the regular polygonal planar contour by N, where N is a positive integer equal to or greater than 2.

5. The self-capacitive touch device according to claim 4, wherein a side of each of the border sensing electrodes is substantially parallel and adjacent to a side of an adjacent sensing electrode of the sensing electrodes.

6. The self-capacitive touch device according to claim 1, wherein the sensing electrodes have a same size and are equidistantly discretely disposed.

7. The self-capacitive touch device according to claim 1, further comprising a border region surrounding the active region;

wherein each of the trace lines comprises an internal connecting portion and an external connecting portion, the internal connecting portions are disposed in the active region, and the external connecting portions are disposed in the border region and are formed by a conductive material comprising at least one of metal, alloy and indium tin oxide (ITO).

8. The self-capacitive touch device according to claim 1, wherein the trace lines and the sensing electrodes are a single-layer transparent conductive layer, and are formed by a transparent conductive layer.

9. A self-capacitive touch device, comprising:

an active area of a single transparent conducting layer with at least an arched edge, comprising;

a plurality of sensing electrodes in a most densely stacked arrangement and leaving minimum space without coverage at the arched edge of the active area, each of the sensing electrodes has one side substantially parallel and adjacent to one side of an adjacent sensing electrode of the sensing electrodes, each sensing electrode having a first convex polygon shape with ii ore than four sides, wherein at east two sides of each of the sensing electrodes align with sides of at least two other sensing electrodes; and

a plurality of trace lines, entirely disposed between said sensing electrodes, each of said trace lines directly connected at a first end to only one of said sensing electrodes,

wherein each of the internal connecting portions is connected to a vertex of one of the sensing electrodes,

wherein each of the trace lines is connected to a corresponding contact pad, and the corresponding contact pad of each of the trace lines is located in a contact pad region disposed at a single side of the sensing electrodes,

wherein the trace lines comprise a plurality of bend points, and number of the bend points of each of the trace lines increases with distance between the each of the trace lines and corresponding contact pad, wherein at least one part of the bend points of the part of segments of the trace lines being disposed in the active region have same bending angle, and the bending angle is 120 degrees.

10. The self-capacitive touch device according to claim 9, wherein each of the trace lines connects to a vertex of its corresponding sensing electrode.

11. The self-capacitive touch device according to claim 9, wherein said single transparent conducting layer further comprises:

a border region; and

a plurality of border sensing units, each shaped as bisection of said first convex polygon shape, disposed on a border between the active area and the border region.

12. The self-capacitive touch device according to claim 11, wherein each of the trace lines connects to vertex of its corresponding sensing electrode.

13. The self-capacitive touch device according to claim 11, wherein said active area is circular or ellipsoid.

14. The self-capacitive touch device according to claim 13, wherein each of the trace lines connects to a vertex of its corresponding sensing electrode.

15. The self-capacitive touch device according to claim 9, wherein each of said trace lines is directly connected at a second end opposite to said first end to a corresponding contact pad.

16. The self-capacitive touch device according to claim 15, wherein each contact pad corresponding to each of said trace lines is disposed within said contact pad region.