Touch location correction for touchscreen devices

• US 9,910,542 B2
• Filed: 12/30/2015
• Issued: 03/06/2018
• Est. Priority Date: 12/30/2014
• Status: Active Grant

• Current Assignee: Adonit co. Ltd.
• Original Assignee: Adonit co. Ltd.
• Inventors: Ritchey, Timothy David, Arbogast, Jonathan, Busch, Ian Everett, O'Donnell, Shane
• Primary Examiner(s): Mehmood, Jennifer
• Assistant Examiner(s): Azongha, Sardis F
• Application Number:
  US14/985,367
• Publication Number:
  US 20160357339A1
• Time in Patent Office: 797 Days
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

Methods, systems, and computer readable media are disclosed having methods for correcting a location of a touch sensed by a capacitive touch screen when using a stylus, especially an active electronic stylus. The various corrector methods correct touch locations such as manufacturer'"'"'s built-in offset designed for fingertips, touchscreen drive/sense electrode banding, stylus angle offset, parallax, long linear stroke smoothing, and/or loop smoothing. The corrector methods used may depend on the stylus model and/or the tablet model detected. The corrector methods may configure themselves to conform to the stylus model and/or tablet model detected.

Claims

1. A method for determining correction for a touch location on a touchscreen, the method comprising:

selecting a first band location from a plurality of band locations;

selecting a second band location from the plurality of band locations; and

determining the correction from the touch location, the first band location, and the second band location,

wherein determining the correction comprises applying a trigonometric function to a value, wherein the trigonometric function is sine and the value is;

π

×

((B₁+B₂−

(2×

L))/(|B1−

B2|))

where B₁, is the first band location, and where

B₂ is the second band location, and

where L is the touch location.

2. The method of claim 1, further comprising:

correcting the touch location by applying the correction to the touch location.

3. The method of claim 1, wherein the first band location is selected such that the first band location is a closest band location to the touch location.

4. The method of claim 3, wherein the second band location is selected such that the second band location is a second closest band location to the touch location.

5. The method of claim 3, wherein the second band location is selected such that the second band location is adjacent to the first band location and the touch location is between the first band location and the second band location.

6. The method of claim 3, wherein when the touch location is exactly on the first band location, then the second band location is selected such that the second band location is adjacent to the first band location.

7. A computer system comprising:

one or more processors;

a non-transitory computer readable medium operatively coupled to the one or more processors; and

logic stored in the computer readable medium that, when executed by the one or more processors from the computer readable medium, causes the computer to determine correction for a touch location on a touchscreen by at least;

selecting a first band location from a plurality of band locations;

selecting a second band location from the plurality of band locations; and

determining the correction from the touch location, the first band location, and the second band location,

wherein determining the correction comprises applying a trigonometric function to a value, wherein the trigonometric function is sine and the value is;

π

×

((B₁+B₂−

(2×

L))/(|B1−

B2|))

where B₁, is the first band location, and where

B₂ is the second band location, and

where L is the touch location.

8. The computer system of claim 7, the logic further comprising:

correcting the touch location by applying the correction to the touch location.

9. The computer system of claim 7, wherein the first band location is selected such that the first band location is a closest band location to the touch location.

10. The computer system of claim 9, wherein the second band location is selected such that the second band location is a second closest band location to the touch location.

11. The computer system of claim 9, wherein the second band location is selected such that the second band location is adjacent to the first band location and the touch location is between the first band location and the second band location.

12. The computer system of claim 9, wherein when the touch location is exactly on the first band location, then the second band location is selected such that the second band location is adjacent to the first band location.

13. A non-transitory computer-readable medium storing computer-readable code thereon that, when executed by a computer, causes the computer to perform operations to determine a correction for a touch location on a touchscreen by at least:

selecting a first band location from a plurality of band locations;

selecting a second band location from the plurality of band locations; and

determining the correction from the touch location, the first band location, and the second band location,

wherein determining the correction comprises applying a trigonometric function to a value, wherein the trigonometric function is sine and the value is;

π

×

((B₁+B₂−

(2×

L))/(|B1−

B2|))

where B₁, is the first band location, and where

B₂ is the second band location, and

where L is the touch location.

14. The non-transitory computer-readable medium of claim 13, the operations further comprising:

correcting the touch location by applying the correction to the touch location.

15. The non-transitory computer-readable medium of claim 13, wherein the first band location is selected such that the first band location is a closest band location to the touch location.

16. The non-transitory computer-readable medium of claim 15, wherein the second band location is selected such that the second band location is a second closest band location to the touch location.

17. The non-transitory computer-readable medium of claim 15, wherein the second band location is selected such that the second band location is adjacent to the first band location and the touch location is between the first band location and the second band location.

18. The non-transitory computer-readable medium of claim 15, wherein when the touch location is exactly on the first band location, then the second band location is selected such that the second band location is adjacent to the first band location.