Input location correction tables for input panels

• US 8,952,892 B2
• Filed: 11/01/2012
• Issued: 02/10/2015
• Est. Priority Date: 11/01/2012
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Chai, Min Chin
• Primary Examiner(s): Chang, Kent
• Assistant Examiner(s): BRITTINGHAM, NATHANIEL P
• Application Number:
  US13/666,958
• Publication Number:
  US 20140118241A1
• Time in Patent Office: 831 Days
• Field of Search: None
• US Class Current: 345/156
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment

Abstract

One or more input location correction tables are used to compensate for interference introduced into input panels and generate a corrected location based on a sensed location of the input panel. The one or more input location correction tables can include a coarse table and a fine table that stores mappings of intermediate locations mapped to by the coarse table having an accuracy that fails to satisfy a threshold coordinate accuracy. Different environments in which computing device can be situated can result in different interference being introduced, and the one or more input location correction tables can be updated based on the current environment to compensate for the interference introduced in the current environment.

Claims

1. A system comprising:

a coarse correction table storing mappings of sensed locations of an input panel to intermediate corrected locations that compensate for interference introduced into the input panel;

a partial fine correction table storing mappings of particular intermediate corrected locations to corrected locations, the particular intermediate corrected locations comprising a subset of the intermediate corrected locations having an accuracy that fails to satisfy a threshold coordinate accuracy; and

a compensation control module configured to apply to a sensed location of the input panel the mappings of the coarse correction table and the mappings of the partial fine correction table to generate a corrected location that compensates for interference introduced into the input panel.

2. A system as recited in claim 1, the coarse correction table and/or partial fine correction table being a combination of a baseline table and a regional correction table corresponding to a current environment of the input panel.

3. A system as recited in claim 1, the coarse correction table storing mappings for substantially all locations of the input panel.

4. A system as recited in claim 1, the partial fine correction table excluding mappings for intermediate corrected locations that satisfy the threshold coordinate accuracy.

5. A system as recited in claim 1, further comprising an additional table storing mappings of locations of the partial fine correction table that do not satisfy an additional threshold coordinate accuracy.

6. A system as recited in claim 1, the input panel comprising a digitizer that receives inputs provided via a stylus using electro-magnetic resonance.

7. A system as recited in claim 1, the compensation control module being configured to apply the mappings of the coarse correction table to the sensed location to generate an intermediate location, and to apply the mappings of the partial fine correction table to the intermediate location in response to a mapping for the intermediate location being included in the partial fine correction table to generate the corrected location.

8. A system as recited in claim 7, the compensation control module being further configured to use the intermediate location as the corrected location in response to no mapping for the intermediate location being included in the partial fine correction table.

9. A method comprising:

identifying a current environment of an input panel;

obtaining a regional correction table corresponding to the current environment of the input panel, the regional correction table identifying changes to make to one or more baseline tables that store mappings to generate, based on a sensed location of the input panel, a corrected location that compensates for interference introduced into the input panel; and

updating the one or more baseline tables in accordance with the changes identified in the regional correction table.

10. A method as recited in claim 9, the one or more baseline tables including a coarse correction table that includes mappings that correct for a particular type of interference, and a fine correction table that corrects for coordinate shift introduced by the particular type of interference.

11. A method as recited in claim 10, the particular type of interference comprising magnetic and metal interference.

12. A method as recited in claim 10, the fine correction table comprising a partial fine correction table that stores mappings of intermediate locations mapped to by the coarse correction table having an accuracy that fails to satisfy a threshold coordinate accuracy.

13. A method as recited in claim 9, the input panel comprising a digitizer that receives inputs provided via a stylus using electro-magnetic resonance.

14. A method as recited in claim 9, the one or more baseline tables storing mappings to generate corrected locations that compensate for interference introduced into the input panel in an environment in which no additional devices are attached to a computing device including the input panel and no additional devices are within a threshold distance of the input panel.

15. A method as recited in claim 14, the current environment comprising the computing device and a keyboard magnetically attached to the computing device.

16. A method as recited in claim 9, the obtaining comprising retrieving the regional correction table from a memory separate from a correction table memory in which the one or more baseline tables are stored, and the updating comprising updating the one or more baseline tables in the correction table memory.

17. A method as recited in claim 9, the current environment comprising a device including the input panel and one or more additional devices attached to the device.

18. A method as recited in claim 9, the current environment comprising one or more additional devices within a threshold distance of the input panel.

19. A method as recited in claim 9, the current environment comprising a device including the input panel and one or more additional devices that are enabled and attached to and/or within a threshold distance of the device.

20. A computing device comprising:

one or more processors; and

one or more computer-readable storage media having stored thereon multiple instructions that, when executed by the one or more processors, cause the one or more processors to;

identify a current environment of the computing device;

obtain a regional correction table corresponding to the current environment of the computing device, the regional correction table identifying changes to make to baseline tables including a coarse correction table and a partial fine correction table, the baseline tables storing mappings to generate, based on a sensed location of an input panel of the computing device, a corrected location that compensates for magnetic and metal interference introduced to the input panel, the partial fine correction table storing mappings of intermediate locations mapped to by the coarse correction table having an accuracy that fails to satisfy a threshold coordinate accuracy; and

update the one or more baseline tables in accordance with the changes identified in the regional correction table.