TOUCH SCREEN DEVICE AND METHOD THEREOF FOR SENSING APPROACH

• US 20130335372A1
• Filed: 07/21/2011
• Published: 12/19/2013
• Est. Priority Date: 03/30/2011
• Status: Abandoned Application

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Wu, Hongchao
• Application Number:
  US13/981,149
• Publication Number:
  US 20130335372A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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

The present document discloses a touch screen device and a method for implementing proximity sensing by the touch screen device. The method includes: within a time interval of scanning sensing channels of a capacitive touch screen one by one, performing whole layer scanning for the sensing channels of the capacitive touch screen; and comparing a result of performing the whole layer scanning for the sensing channels of the capacitive touch screen with a preset threshold, and if the result of the whole layer scanning is larger than the preset threshold, triggering a corresponding processing of a large-area touch event. The present document can implement the proximity sensing to a large-area object by the touch screen, and can distinguish effectively the large-area proximity event from the normal single-point or multi-point touch event during a user operation, thereby avoiding unnecessary false triggering.

Claims

1. A method for a touch screen device implementing proximity sensing, comprising:

within a time interval of scanning sensing channels of a capacitive touch screen one by one, performing whole layer scanning for the sensing channels of the capacitive touch screen;

comparing a result of performing the whole layer scanning for the sensing channels of the capacitive touch screen with a preset threshold, and if the result of the whole layer scanning is larger than the preset threshold, triggering a corresponding processing of a large-area touch event.

2. The method of claim 1, wherein, the result of performing the whole layer scanning for the sensing channels of the capacitive touch screen is:

a voltage variation or a capacitance variation of a whole layer of sensing channels;

accordingly, when the voltage variation of the whole layer of the sensing channels is larger than a preset voltage threshold, or when the capacitance variation of the whole layer of the sensing channels is larger than a preset capacitance threshold, the corresponding processing of the large-area touch event is triggered.

3. The method of claim 2, wherein, the preset voltage threshold is larger than a maximum value of all the voltage variations in the sensing channels caused by normal single-point and multi-point touch events in the touch screen device;

or

the preset capacitance threshold is larger than a maximum value of all the capacitance variations in the sensing channels caused by normal single-point and multi-point touch events in the touch screen device.

4. The method of claim 1, wherein, the capacitive touch screen comprises two layers of sensing channels which are mutually perpendicular, including emitting electrode sensing channels and receiving electrode sensing channels respectively;

accordingly, the method further comprises;

within a time interval of scanning the emitting electrode sensing channels and/or the receiving electrode sensing channels one by one, performing the whole layer scanning for the sensing channels of the capacitive touch screen.

5. The method of claim 4, wherein, the whole layer scanning for the sensing channels of the capacitive touch screen comprises:

performing the whole layer scanning for the emitting electrode sensing channels and/or the receiving electrode sensing channels.

11. The method of claim 2, wherein, the capacitive touch screen comprises two layers of sensing channels which are mutually perpendicular, including emitting electrode sensing channels and receiving electrode sensing channels respectively;

accordingly, the method further comprises;

within a time interval of scanning the emitting electrode sensing channels and/or the receiving electrode sensing channels one by one, performing the whole layer scanning for the sensing channels of the capacitive touch screen.

12. The method of claim 11, wherein, the whole layer scanning for the sensing channels of the capacitive touch screen comprises:

performing the whole layer scanning for the emitting electrode sensing channels and/or the receiving electrode sensing channels.

13. The method of claim 3, wherein, the capacitive touch screen comprises two layers of sensing channels which are mutually perpendicular, including emitting electrode sensing channels and receiving electrode sensing channels respectively;

accordingly, the method further comprises;

within a time interval of scanning the emitting electrode sensing channels and/or the receiving electrode sensing channels one by one, performing the whole layer scanning for the sensing channels of the capacitive touch screen.

14. The method of claim 13, wherein, the whole layer scanning for the sensing channels of the capacitive touch screen comprises:

performing the whole layer scanning for the emitting electrode sensing channels and/or the receiving electrode sensing channels.

6. A touch screen device, comprising:

a sensing channel scanning module, configured to perform whole layer scanning for sensing channels of a capacitive touch screen within a time interval of scanning the sensing channels of the capacitive touch screen one by one; and

a comparing module, configured to compare a result of performing, by the sensing channel scanning module, the whole layer scanning for the sensing channels of the capacitive touch screen with a preset threshold, and if the result of the whole layer scanning is larger than the preset threshold, trigger a corresponding processing of a large-area touch event.

7. The touch screen device of claim 6, wherein, the result of performing the whole layer scanning for the sensing channels of the capacitive touch screen is:

a voltage variation or a capacitance variation of a whole layer of sensing channels;

accordingly, the comparing module is further configured to, when the voltage variation of the whole layer of the sensing channels is larger than a preset voltage threshold, or when the capacitance variation of the whole layer of the sensing channels is larger than a preset capacitance threshold, trigger the corresponding processing of the large-area touch event.

8. The touch screen device of claim 7, wherein, the preset voltage threshold is larger than a maximum value of all the voltage variations in the sensing channels caused by normal single-point and multi-point touch events in the touch screen device;

or

the preset capacitance threshold is larger than a maximum value of all the capacitance variations in the sensing channels caused by normal single-point and multi-point touch events in the touch screen device.

9. The touch screen device of claim 6, wherein, the capacitive touch screen comprises two layers of sensing channels which are mutually perpendicular, including emitting electrode sensing channels and receiving electrode sensing channels respectively;

accordingly, the sensing channel scanning module is further configured to;

within a time interval of scanning the emitting electrode sensing channels and/or the receiving electrode sensing channels one by one, perform the whole layer scanning for the sensing channels of the capacitive touch screen.

10. The touch screen device of claim 9, wherein, the sensing channel scanning module is further configured to perform the whole layer scanning for the emitting electrode sensing channels and/or the receiving electrode sensing channels.

15. The touch screen device of claim 7, wherein, the capacitive touch screen comprises two layers of sensing channels which are mutually perpendicular, including emitting electrode sensing channels and receiving electrode sensing channels respectively;

accordingly, the sensing channel scanning module is further configured to;

within a time interval of scanning the emitting electrode sensing channels and/or the receiving electrode sensing channels one by one, perform the whole layer scanning for the sensing channels of the capacitive touch screen.

16. The touch screen device of claim 15, wherein, the sensing channel scanning module is further configured to perform the whole layer scanning for the emitting electrode sensing channels and/or the receiving electrode sensing channels.

17. The touch screen device of claim 8, wherein, the capacitive touch screen comprises two layers of sensing channels which are mutually perpendicular, including emitting electrode sensing channels and receiving electrode sensing channels respectively;

accordingly, the sensing channel scanning module is further configured to;

within a time interval of scanning the emitting electrode sensing channels and/or the receiving electrode sensing channels one by one, perform the whole layer scanning for the sensing channels of the capacitive touch screen.

18. The touch screen device of claim 17, wherein, the sensing channel scanning module is further configured to perform the whole layer scanning for the emitting electrode sensing channels and/or the receiving electrode sensing channels.