TOUCH SENSITIVE SCREEN CONFIGURATIONS

• US 20120026122A1
• Filed: 07/28/2010
• Published: 02/02/2012
• Est. Priority Date: 07/28/2010
• Status: Active Grant

• Current Assignee: Neodrón Limited (Atlantic IP Services Limited)
• Original Assignee: QRG Limited
• Inventors: SIMMONS, Martin J.
• Granted Patent: US 8,723,834 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• 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

Abstract

Examples of arrangements of electrodes on a touch sensitive screen provide one or more advantages, such as reduced cross coupling, for example, when a person is using both thumbs or several fingers at substantially the same time to control the touch screen.

Claims

1. A touch sensitive screen comprising:

at least one insulator;

first and second pluralities of electrodes separated by the at least one insulator, the plurality of first electrodes being arranged in a first direction, and the plurality of second electrodes being arranged in a second direction different from the first direction such that the first and second electrodes cross over each other to form touch sensing nodes;

a controller configured to supply signals to and receive signals from electrodes;

a first plurality of channels connecting the first electrodes to the controller;

a second plurality of channels connecting the second electrodes to the controller, wherein;

each of the second electrodes comprises a first section and a second section,

the first section of each second electrode is connected to a first one of the plurality of the second channels and the second section of each second electrode is connected to a second one of the plurality of second channels.

the first one of the second channels and the second one of the second channels connected to sections of each of the second electrodes are different from one another, such that the second sections are connected through the second channels to the controller in an order different from an order of connections of the first sections through the second channels to the controller and

the controller is further configured to compensate for the different orders of connections when determining a position of a touch at the touch sensitive screen.

2. The touch sensitive screen of claim 1, wherein:

the first electrodes are drive electrodes and the first channels are drive channels, and

the second electrodes are sense electrodes and the second channels are sense channels.

3. The touch sensitive screen of claim 2, wherein the controller comprises:

a drive unit configured to apply drive signals to the drive electrodes via the drive channels;

a sense unit configured to sense signals from the sense electrodes via the sense channels; and

a processor configured to control the drive unit and responsive to sensing by the sense unit, to compensate for the different orders of connections and determine the position of the touch at the touch sensitive screen.

4. The touch sensitive screen of claim 3, further comprising:

a storage device accessible by the processor; and

programming in the storage device, which configures the processor to compensate for the different orders of connections.

10. The touch sensitive screen of claim 1, wherein the first electrodes are drive electrodes and the second electrodes are sense electrodes.

11. The touch sensitive screen of claim 10, wherein the controller comprises:

a drive unit configured to apply drive signals to the drive electrodes;

a sense unit configured to sense signals from the sense electrodes; and

a processor configured to control the drive unit and responsive to sensing by the sense unit, to compensate for the rotated orientation of the electrodes and determine the position of the touch at the touch sensitive screen.

12. The touch sensitive screen of claim 11, further comprising:

a storage device accessible by the processor; and

programming in the storage device, which configures the processor to compensate for the rotated orientation of the electrodes.

5. A touch sensitive screen comprising:

a plurality of drive electrodes provided on at least one substrate, each drive electrode connected to a drive channel; and

a plurality of sense electrodes provided on the at least one substrate, wherein;

a plurality of capacitive sensing nodes are formed at intersections of the drive electrodes and the sense electrodes,

each sense electrode comprises a first electrode and a second sense electrode,

the first electrode of each sense electrode is connected to a first of a plurality of sense channels and the second electrode of each sense electrode is connected to a second of the plurality of sense channels.

the first sense channel and the second sense electrode channel for each of the sense electrodes being different from one another, such that the second electrodes are connected to the sense channels in an order different from an order of connections of the first electrodes to the sense channels; and

a controller configured to supply drive signals to the drive channels, receive sense signals from the first and second sense channels, to compensate for the different orders of connections, and to determine a position of a touch at the touch sensitive screen.

6. The touch sensitive screen of claim 5, wherein:

each sense electrode comprises a first end provided at the first electrode and connected to the first sense channel, and a second end provided at the second electrode and connected to the second sense channel, and

the first electrode and the second electrode of each sense electrode are separated from each other.

7. The touch sensitive screen of claim 6, wherein the controller is configured to reorder signals from the second electrode channels to implement the compensation for the different orders of connections.

8. The touch sensitive screen of claim 6, wherein the controller comprises:

a programmable processor;

a storage device accessible by the processor; and

programming in the storage device, which configures the processor to compensate for the different orders of connections.

9. A touch sensitive screen comprising:

at least one insulator;

first and second pluralities of electrodes separated by the at least one insulator, the plurality of first electrodes being arranged in a first direction, and the plurality of second electrodes being arranged in a second direction different from the first direction such that the first and second electrodes cross over each other to form touch sensing nodes;

a controller configured to supply signals to and receive signals from electrodes;

wherein;

the first and second electrodes are arranged at a rotated orientation, such that each of the first electrodes is provided at a predetermined angle with respect to the elevational dimension of the screen and each of the second electrodes is provided at a predetermined angle with respect to the lateral dimension of the screen, and

the controller is further configured to compensate for the rotated orientation of the electrodes when determining a position of a touch at the touch sensitive screen.

13. A touch sensitive screen comprising:

a plurality of drive electrodes provided on at least one substrate; and

a plurality of sense electrodes provided on the at least one substrate, wherein;

a plurality of capacitive sensing nodes are formed at intersections of the drive electrodes and the sense electrodes,

the plurality of drive and sense electrodes are arranged at an orientation rotated relative to the dimensions of the screen, such that each of the drive electrodes is provided at a predetermined angle with respect to the elevational dimension of the screen and each of the sense electrodes is provided at a predetermined angle with respect to the lateral dimension of the screen; and

a controller configured to supply drive signals to the drive electrodes, to receive sense signals from the sense electrodes, and to process the received sense signals to compensate for the rotated orientation of the electrodes and determine a position of a touch at the touch sensitive screen.

14. The touch sensitive screen of claim 13, wherein the controller is configured to apply a mathematical formula to process signals from the sense electrodes to implement the compensation for the rotated orientation of the electrodes.

15. The touch sensitive screen of claim 13, wherein the controller comprises:

a programmable processor;

a storage device accessible by the processor; and

programming in the storage device, which configures the processor to compensate for the rotated orientation of the electrodes.