Induction unit, touch detecting assembly and touch sensitive device

• US 9,459,739 B2
• Filed: 07/26/2012
• Issued: 10/04/2016
• Est. Priority Date: 07/26/2011
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited, Shenzhen BYD Auto R&D Company Limited (BYD Company Limited)
• Inventors: Li, Zhengang, Huang, Chen, Yang, Yun
• Primary Examiner(s): Karimi, Pegeman
• Application Number:
  US14/131,729
• Publication Number:
  US 20140168159A1
• Time in Patent Office: 1,531 Days
• Field of Search: 345173-178
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

An induction unit, a touch detecting assembly, and a touch sensitive device are provided. The touch sensitive device comprises: a substrate (100); a plurality of induction units (200) not intersecting with each other, and a detecting module (300) connected with the first electrodes (210) and the second electrodes (220) respectively. The induction unit (200) comprises a first electrode (210), a second electrode (220), a plurality of first structures (230) and a plurality of second structures (240). The plurality of first structures (230) are connected end to end via the plurality of second structures (240). The detecting module (300) is configured to apply a level signal to the first electrodes (210) and/or the second electrodes (220) to charge a self capacitor, to calculate a ratio between a first resistor and a second resistor, and to determine a touch position in a first direction and a touch position in a second direction.

Claims

1. A touch sensitive device, comprising:

a touch detecting assembly comprising a substrate and a plurality of induction units disposed on the substrate and not intersecting with each other, wherein the induction unit comprises a first electrode, a second electrode, a plurality of first structures, and a plurality of second structures, the plurality of first structures are connected end to end via the plurality of second structures, the first electrode is connected with one first structure at one end of the induction unit, the second electrode is connected with another first structure at the other end of the induction unit, and each first electrode and each second electrode are connected with corresponding pins of a control chip;

a control chip, wherein the first electrodes and the second electrodes of the plurality of induction units are connected with corresponding pins of the control chip, and the control chip is configured to apply a level signal to each first electrode and/or each second electrode to charge a self capacitor generated by a touch on an induction unit, and to calculate a ratio between a first resistor between a first electrode of at least one induction unit and the self capacitor and a second resistor between a second electrode of the at least one induction unit and the self capacitor when the touch is detected on the at least one induction unit; and

a host computer, configured to receive the ratio between the first resistor and the second resistor sent from the control chip, to determine a touch position in a first direction according to the ratio between the first resistor and the second resistor, and to determine a touch position in a second direction according to a position of the at least one touched induction unit.

2. The touch sensitive device according to claim 1, wherein the ratio between the first resistor and the second resistor is calculated by a ratio between a first detecting value and a second detecting value obtained by detecting the first electrode and/or the second electrode of the at least one touched induction unit when the self capacitor is charged/discharged.

3. The touch sensitive device according to claim 2, wherein the first detecting value or the second detecting value is one or more values selected from a current detecting value, a self capacitance detecting value, a voltage detecting value, and a charge variation.

4. The touch sensitive device according to claim 1, wherein a position of a touch point on a touch screen is determined by the host computer according to the touch position in the first direction and the touch position in the second direction.

5. The touch sensitive device according to claim 1 or 4, wherein the first direction is a length direction of each induction unit, the second direction is a direction vertical to each induction unit, and each induction unit is disposed horizontally or vertically.

6. The touch sensitive device according to claim 1, wherein the first detecting value comprises a first charge detecting value and a first discharge detecting value, and the second detecting value comprises a second charge detecting value and a second discharge detecting value.

7. The touch sensitive device according to claim 6, wherein the control chip is configured to apply level signals to the first electrode and the second electrode of the at least one touched induction unit to charge the self capacitor, and to perform a charge detection from the first electrode and/or the second electrode of the at least one touched induction unit to obtain the first charge detecting value and the second charge detecting value.

8. The touch sensitive device according to claim 6, wherein the control chip is configured to apply a level signal twice to the first electrode or the second electrode of the at least one touched induction unit to charge the self capacitor twice, and to perform a charge detection from the first electrode and/or the second electrode of the at least one touched induction unit to obtain the first charge detecting value and the second charge detecting value after each charge.

9. The touch sensitive device according to claim 8, wherein

when the control chip applies the level signal twice to the first electrode of the at least one touched induction unit to charge the self capacitor twice, the second electrode of the at least one touched induction unit is grounded for a first time charge, and the second electrode of the at least one touched induction unit is connected with a large resistor for a second time charge;

and

when the control chip applies the level signal twice to the second electrode of the at least one touched induction unit to charge the self capacitor twice, the first electrode of the at least one touched induction unit is grounded for a first time charge, and the first electrode of the at least one touched induction unit is connected with a large resistor for a second time charge.

10. The touch sensitive device according to claim 6, wherein the control chip is configured to apply level signals to the first electrode and the second electrode of the at least one touched induction unit to charge the self capacitor, to control the first electrode and/or the second electrode of the at least one touched induction unit to be grounded to discharge the self capacitor, and to perform a discharge detection from the first electrode and/or the second electrode of the at least one touched induction unit to obtain the first discharge detecting value and the second discharge detecting value.

11. The touch sensitive device according to claim 6, wherein the control chip is configured to apply a level signal to the first electrode or the second electrode of the at least one touched induction unit to charge the self capacitor, to control the first electrode and the second electrode of the at least one touched induction unit to be grounded respectively to discharge the self capacitor, and to perform a discharge detection from the first electrode and/or the second electrode of the at least one touched induction unit to obtain the first discharge detecting value and the second discharge detecting value.

12. The touch sensitive device according to claim 6, wherein the control chip is configured to apply a level signal to the first electrode or the second electrode of the at least one touched induction unit to charge the self capacitor, to control the first electrode or the second electrode of the at least one touched induction unit to be grounded to discharge the self capacitor, and to perform a discharge detection from the first electrode and the second electrode of the at least one touched induction unit to obtain the first discharge detecting value and the second discharge detecting value.

13. The touch sensitive device according to claim 6, wherein the control chip comprises one or two self-capacitance detecting sub-modules.