SELF-CAPACITIVE TOUCH DEVICE AND CALCULATION METHOD THEREOF

• US 20160018927A1
• Filed: 07/21/2015
• Published: 01/21/2016
• Est. Priority Date: 07/21/2014
• Status: Active Grant

• Current Assignee: Ili Technology Corp. (MediaTek, Inc.)
• Original Assignee: MStar Semiconductor Incorporated (MediaTek, Inc.)
• Inventors: DING, PENG-YUN, LEE, PING-HWAN
• Granted Patent: US 10,372,273 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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, comprising:

a transparent substrate;

a plurality of sensing units, alternately disposed on the substrate, each having a polygonal planar contour with M sides, M being a positive integer equal to or greater than 4, sides of each of the sensing units corresponding to sides of at least two of the remaining sensing units; and

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

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, wherein the plurality of sensing units are in a most densely stacked arrangement, and each of the sensing units has one side substantially parallel and corresponding to one side of an adjacent sensing unit of the sensing units.

5. The self-capacitive touch device according to claim 1, wherein the sensing units have a regular hexagonal planar contour.

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

a border region, surrounding the active region;

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

wherein, each of the border sensing units 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.

7. The self-capacitive touch device according to claim 6, wherein a side of each of the border sensing units is substantially parallel and corresponding to a side of an adjacent sensing unit of the sensing units.

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

9. The self-capacitive touch device according to claim 1, wherein the trace lines are disposed between the sensing units.

10. 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).

11. The self-capacitive touch device according to claim 10, wherein each of the internal connecting portions is connected to a vertex of each of the sensing units.

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

13. A calculation method for a self-capacitive touch device, applied to the self-capacitive touch device according to claim 1, the calculation method comprises:

detecting a touch point by the self-capacitive touch device, the touch point covering at least one of the plurality of sensing units such that the sensing unit covered by the touch pint generates a sensed capacitance; and

multiplying the sensed capacitance by a weight, wherein a value of the weight is associated with a position of the sensing unit covered by the touch point.

14. The calculation method for a touch display device according to claim 13, wherein the touch point simultaneously covers the sensing unit at a P^th column and a Q^th row and the sensing unit at a (P+2)^th column and a Q^th row, where P and Q are positive integers equal to or greater than 1;

the calculation method comprising applying an equation;

15. The calculation method for a touch display device according to claim 14, wherein one side of the sensing unit at the (P+2)^th column and the Q^th row is substantially parallel and corresponding to one side of the sensing unit at the P^th column and the Q^th row.

16. The calculation method for a touch display device according to claim 13, wherein the touch point simultaneously covers the sensing unit at a P^th column and a Q^th row, the sensing unit at a (P+2)^th column and a Q^th row, the sensing unit at a (P+1)^th column and a (Q+1)^th row, and the sensing unit at a (P+1)^th column and a (Q−

1)^th row, where P and Q are positive integers equal to or greater than 1;

the calculation method comprising applying an equation;

17. The calculation method for a touch display device according to claim 16, wherein values of X₀, X₁ and X₂ are gradually increasing or decreasing positive integers.

18. The calculation method for a touch display device according to claim 16, wherein one side of the sensing unit at the (P+2)^th column and the Q^th row, one side of the sensing unit at the (P+1)^th column and the (Q+1)^th row, and one side of the sensing unit 104 at the (P+1)^th column and the (Q−

1)^th row are substantially parallel to different sides of the sensing unit at the P^th column and the Q^th row, respectively.

19. The calculation method for a touch display device according to claim 15, wherein the touch point simultaneously covers the sensing unit at a (P+1)^th column and a (Q+1)^th row and the sensing unit 104 at a (P+1)^th column and a (Q−

1)^th row, wherein P and Q are positive integers equal to or greater than 1;

the calculation method comprising applying an equation;

20. The calculation method for a touch display device according to claim 13, wherein the touch point simultaneously covers the sensing unit 104 at a P^th column and a Q^th row, the sensing unit at a (P+2)^th column and a Q^th row, the sensing unit at a (P+1)^th column a (Q+1)^th row, and the sensing unit at a (P+1)^th column and a (Q−

1)^th row, where P and Q are positive integers equal to or greater than 1;

the calculation method further comprising;