Sensing electrode group and sensed capacitance estimation method and apparatus

1. A sensing electrode group, formed on a substrate of a touch apparatus, comprising:

a plurality of sensing electrode unit pairs arranged along a first axis, each of the sensing electrode unit pairs comprising:

a first sensing electrode unit, comprising a first electrode connected to a first conducting wire, a second electrode connected to a second conducting wire, wherein the first electrode and the second electrode have a complimentary shape to each other; and

a second sensing electrode unit, comprising a third electrode connected to a third conducting wire, a fourth electrode connected to a fourth conducting wire, wherein the third electrode and the fourth electrode have a complimentary shape to each other;

wherein the first sensing electrode unit and the second sensing electrode unit are arranged along a second axis, the first axis and the second axis are perpendicular to each other;

wherein the first conducting wire, the second conducting wire, the third conducting wire and the fourth conducting wire are routed in a first direction along the second axis;

wherein the third conducting wire and the fourth conducting wire are routed in a sensing area next to the first sensing electrode unit;

wherein a first capacitance ratio of the first sensing electrode unit to the third conducting wire and a second capacitance ratio of the first sensing electrode unit to the fourth conducting wire are predetermined for a first-axis coordinate value;

wherein a third capacitance value of the third conducting wire and a fourth capacitance value of the fourth conducting wire are calculated in accordance with a capacitance change on the first sensing electrode unit, the first capacitance ratio, and the second capacitance ratio.

2. The sensing electrode according to claim 1 , wherein the third conducting wire and the fourth conducting wire are routed at two sides of the first sensing electrode unit, respectively.

3. The sensing electrode according to claim 1 , wherein the third conducting wire and the fourth conducting wire are routed at a same side of the first sensing electrode unit.

4. The sensing electrode according to claim 1 , wherein a width of the second sensing unit in the first axis is greater than a width of the first sensing unit in the first axis.

5. The sensing electrode according to claim 1 , wherein a width of the second sensing unit in the first axis is equal to a width of the first sensing unit in the first axis.

6. The sensing electrode according to claim 1 , wherein the plurality of sensing electrode unit pairs comprise a first sensing electrode unit pair and a second sensing electrode unit pair, the first sensing electrode unit pair comprises M first electrodes, M second electrodes, M third electrodes and M fourth electrodes; the second sensing electrode unit pair comprises N first electrodes, N second electrodes, N third electrodes and N fourth electrodes; M is not equal to N.

7. The sensing electrode according to claim 6 , wherein N is equal to 1.

8. The sensing electrode according to claim 1 , wherein the first conducting wire, the second conducting wire, the third conducting wire and the fourth conducting wire connect along the first direction to a logic circuit of the touch apparatus.

9. A sensing electrode unit pair, formed on a substrate of a touch apparatus, comprising:

a first sensing electrode unit, comprising a first electrode connected to a first conducting wire, a second electrode connected to a second conducting wire, wherein the first electrode and the second electrode have a complimentary shape to each other; and

a second sensing electrode unit, comprising a third electrode connected to a third conducting wire, a fourth electrode connected to a fourth conducting wire, wherein the third electrode and the fourth electrode have a complimentary shape to each other;

wherein the first sensing electrode unit and the second sensing electrode unit are arranged along a first axis;

wherein the first conducting wire, the second conducting wire, the third conducting wire and the fourth conducting wire are routed in a first direction along the first axis;

wherein the third conducting wire and the fourth conducting wire are routed in a sensing area adjacent to the first sensing electrode unit;

wherein a first capacitance ratio of the first sensing electrode unit to the third conducting wire and a second capacitance ratio of the first sensing electrode unit to the fourth conducting wire are predetermined for a first-axis coordinate value;

wherein a third capacitance value of the third conducting wire and a fourth capacitance value of the fourth conducting wire are calculated in accordance with a capacitance change on the at least one first sensing electrode unit, the first capacitance ratio, and the second capacitance ratio.

10. The sensing electrode unit pair according to claim 9 , wherein the first conducting wire, the second conducting wire, the third conducting wire and the fourth conducting wire connect along the first direction to a logic circuit of the touch apparatus.

11. An estimation method for sensing capacitance, applied to a sensing electrode formed on a substrate of a touch apparatus, the sensing electrode comprising a plurality of sensing electrode unit pairs arranged along a first axis, each of the sensing electrode unit pairs comprising a first sensing electrode unit connected to a first conducting wire and a second conducting wire and a second sensing electrode unit connected to a third conducting wire and a fourth conducting wire, the first sensing electrode unit and the second sensing electrode unit arranged along a second axis, the first axis is perpendicular to the second axis, the third conducting wire and the fourth conducting wire routed along the second axis in a sensing area adjacent to the first sensing electrode unit; the estimation method comprising:

calculating a first-axis coordinate value of a proximity event according to a plurality of capacitance changes sensed by the first sensing electrode units;

obtaining a predetermined first capacitance ratio of at least one first sensing electrode unit to the third conducting wire and a predetermined second capacitance ratio of the first sensing electrode unit to the fourth conducting wire for the first-axis coordinate value of the proximity event; and

calculating a third capacitance value of the third conducting wire and a fourth capacitance value of the fourth conducting wire in accordance with a capacitance change on the at least one sensing electrode unit, the first capacitance ratio, and the second capacitance ratio.

12. The estimation method according to claim 11 , wherein the step of obtaining the third capacitance ratio and the fourth capacitance ratio comprises:

calculating a proximity area of the proximity event according to the first-axis coordinate value of the proximity event, a plurality of capacitance ratios of the first sensing electrode units corresponding to the first-axis coordinate value, and the plurality of capacitance changes of the first sensing electrode units; and

calculating the third capacitance ratio and the fourth capacitance ratio according to the first-axis coordinate value of the proximity event, the proximity area of the proximity event, and the capacitance change of the at least one first sensing electrode unit.

13. The estimation method according to claim 11 , wherein when the third conducting wire and the fourth conducting wire are routed along the second axis at a same side of the first sensing electrode unit, the estimation method further comprises performing sensing/scanning on the sensing electrode units to complete the estimation method.

14. The estimation method according to claim 11 , wherein the third conducting wire and the fourth conducting wire are routed along the second axis at different sides of the first sensing electrode unit, the estimation method further comprises performing multiple sensing/scanning on the sensing electrode units to complete the estimation method.

15. The estimation method according to claim 11 , wherein when the third capacitance ratio and the fourth capacitance ratio are obtained, the estimation method further comprises calculating the third capacitance value and the fourth capacitance value according to an average value or a median value of the third capacitance ratio and the fourth capacitance ratio.

16. An estimation apparatus, applied to a sensing electrode formed on a substrate of a touch apparatus, the sensing electrode comprising a plurality of sensing electrode unit pairs arranged along a first axis, each of the sensing electrode unit pairs comprising a first sensing electrode unit connected to a first conducting wire and a second conducting wire and a second sensing electrode unit connected to a third conducting wire and a fourth conducting wire, the first sensing electrode unit and the second sensing electrode unit arranged along a second axis, the first axis is perpendicular to the second axis, the third conducting wire and the fourth conducting wire routed along the second axis in a sensing area next to the first sensing electrode unit; wherein the estimation apparatus is configured to:

calculate a first-axis coordinate value of a proximity event according to a plurality of capacitance changes sensed by a plurality of the first sensing electrode units of the sensing electrode unit pairs

obtain a predetermined first capacitance ratio of at least one first sensing electrode unit to the third conducting wire and a predetermined second capacitance ratio of the at least one first sensing electrode unit to the fourth conducting wire according to the first-axis coordinate value of the proximity event, and

calculate a third capacitance value of the third conducting wire and a fourth capacitance value of the fourth conducting wire in accordance with a capacitance change on the at least one first sensing electrode unit, the first capacitance ratio, and the second capacitance ratio.

17. The estimation apparatus according to claim 16 , wherein the estimation apparatus is configured to further calculate a proximity area of the proximity event according to the first-axis coordinate value of the proximity event, a plurality of capacitance ratios of the first sensing electrode units corresponding to the first-axis coordinate value, and the plurality of capacitance changes of the first sensing electrode units, and to calculate the third capacitance ratio and the fourth capacitance ratio according to the first-axis coordinate value of the proximity event, and the proximity area of the proximity event.

18. The estimation apparatus according to claim 16 , wherein when the estimation apparatus obtains a plurality of capacitance ratios the first capacitance ratio and the second capacitive ratio, the estimation apparatus is configured to further calculate the third capacitance value and the fourth capacitance value according to an average value or a median value of the plurality of capacitance ratios.