System and method for filtering touch screen inputs

Patent metadata

Field	Value
Publication number	US-9389714-B2
Application number	US-201414457009-A
Country	US
Kind code	B2
Filing date	Aug 11, 2014
Priority date	Sep 27, 2011
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

A method of filtering a touch screen input is disclosed that includes the steps of detecting a position of a first touch on a touch screen, determining a validation area that includes the position of the first touch, detecting a position for each of one or more second touches on the touch screen, and providing a touch event signal if the positions of all of the second touches are within the validation area.

First claim

What is claimed is:

1. A method of filtering a touch screen input, the method comprising the steps of:
detecting a position of a first center of contact of a finger impression on a touch screen;
detecting a position for each of one or more second centers of contact of the finger impression on the touch screen; and
providing a touch event signal if the positions of all of the second centers of contact of the finger impression are within a common validation area.

2. The method of claim 1 , further comprising the step of determining that the touch screen input is invalid if the position of any of the second centers of contact are outside the validation area.

3. The method of claim 1 , wherein the step of providing the touch event signal comprises providing the touch event signal if a total of first and second contacts of the finger impression are greater than or equal to a first determined number of contacts.

4. The method of claim 3 , further comprising the step of determining that the touch screen input is invalid if an elapsed time since a last contact of the finger impression is greater than or equal to a first determined period of time and the total of the first and second contacts of the finger impression is less than the first determined number of contacts.

5. The method of claim 1 , wherein the step of providing a touch event signal comprises providing the touch event signal if an elapsed time since a first contact of the finger impression is greater than or equal to a second determined period of time.

6. The method of claim 5 , wherein a second contact of the finger impression is detected based on checking for a touch at a time interval equal to a third determined period of time since the last touch was detected.

7. The method of claim 6 , further comprising the step of determining that the touch screen input is invalid if the second contact of the finger impression is not detected at the time interval equal to the third determined period of time since the last touch was detected and the elapsed time since the first contact of the finger impression is less than the second determined period of time.

8. The method of claim 1 , wherein the step of detecting the position of the first center of contact of a finger impression comprises the steps of:
detecting a first contact of the finger impression; and
determining the position of the detected first contact of the finger impression.

9. The method of claim 1 , wherein the step of detecting the position for each of one or more second centers of contact of the finger impression comprises the steps of:
detecting the one or more second centers of contact of the finger impression; and
determining, for each detected one or more second centers of contact of the finger impression, the position of the detected second center of contact of the finger impression.

10. A non-transitory computer-readable medium having computer-executable instructions stored thereon for execution by a processor to perform a method of filtering touch screen inputs, the method comprising the steps of:
detecting a position of a first center of contact of a finger impression on a touch screen;
detecting a position for each of one or more second centers of contact of the finger impression on the touch screen; and
providing a touch event signal if the positions of all of the second centers of contact of the finger impression are within a common validation area.

11. The medium of claim 10 , wherein the method further comprises the step of determining that the touch screen input is invalid if the position of any of the second centers of contact are outside the validation area.

12. The medium of claim 10 , wherein the step of providing the touch event signal comprises providing the touch event signal if a total of first and second contacts of the finger impression are greater than or equal to a first determined number of contacts.

13. The medium of claim 12 , wherein the method further comprises the step of determining that the touch screen input is invalid if an elapsed time since a last contact of the finger impression is greater than or equal to a first determined period of time and the total of the first and second contacts of the finger impression is less than the first determined number of contacts.

14. The medium of claim 1 , wherein the step of providing a touch event signal comprises providing the touch event signal if an elapsed time since a first contact of the finger impression is greater than or equal to a second determined period of time.

15. The medium of claim 14 , wherein a second contact of the finger impression is detected based on checking for a touch at a time interval equal to a third determined period of time since the last touch was detected.

16. The medium of claim 15 , wherein the method further comprises the step of:
determining that the touch screen input is invalid if the second contact of the finger impression is not detected at the time interval equal to the third determined period of time since the last touch was detected and the elapsed time since the first contact of the finger impression is less than the second determined period of time.

17. A method of filtering touch screen inputs, the method comprising the steps of:
detecting one or more positions for one or more centers of contact of a finger impression on a touch screen, the one or more centers located within a fingerprint area of a finger impression; and
providing a touch event signal if the positions of a determined number of most recent centers of contact of the finger impression are within a trigger area associated with the fingerprint area.

18. The method of claim 17 , further comprising the step of:
waiting for a next contact of a finger impression without providing the touch event signal if the position of any of the determined number of the most recent centers of contact is outside the trigger area.

19. The method of claim 18 , further comprising the steps of:
determining that the touch screen input is invalid if an elapsed time since a last contact of a finger impression was detected is greater than or equal to a first determined period of time.

20. The method of claim 18 , further comprising the steps of:
determining a position of the next contact of the finger impression; and
providing the touch event signal if the positions of all of the determined number of most recent centers of contact are within the trigger area.

21. The method of claim 20 , further comprising the steps of:
determining that the touch screen input is invalid if an elapsed time since a first contact of the finger impression was detected is greater than or equal to a second determined period of time and the positions of any of the determined number of most recent centers are not within the trigger area.

22. A non-transitory computer-readable medium having computer-executable instructions stored thereon for execution by a processor to perform a method of filtering touch screen inputs, the method comprising the steps of:
detecting one or more positions for one or more centers of contact of a finger impression on a touch screen, the one or more centers located within a fingerprint area of a finger impression; and
providing a touch event signal if the positions of a determined number of most recent centers of contact of the finger impression are within a trigger area associated with the fingerprint area.

23. The medium of claim 22 , wherein the method further c

Assignees

• Carefusion 303 Inc

Inventors

• Vik Daniel
• Borges Gregory

Classifications

• G06F3/041 Primary

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G06F3/0418

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F3/04186 Primary

  Touch location disambiguation · CPC title