Baselining techniques in force-based touch panel systems
Assignee3M Innovative Properties Company
InventorJerry B. Roberts
Life of this patent
Estimating the term…
Abstract
In connection with establishing a touch location on a touch screen, a number of reference levels are developed. One or more of the reference levels may be used to determine a differential change in the touch signal between a zero touch force condition and a touch event. In one approach, one or more reference levels are selected to compensate for various conditions affecting the touch screen at the time a touch is applied. Using one or more reference levels to compensate for conditions affecting the touch signal at the time touch location information is obtained can provide improved accuracy in determining touch location.
Claims85
A method for determining a touch location of a touch on a touch screen, comprising:
- acquiring a plurality of reference levels for a force responsive touch signal;
- selecting one or more of the plurality of reference levels based on information acquired from the touch signal;
- and
- determining the touch location using the one or more selected reference levels.
A method for determining a touch location of a touch on a touch screen, comprising:
- developing a first reference level for a force responsive touch signal;
- developing a second reference level for the force responsive touch signal;
- and
- determining the touch location using at least one of the first and second reference levels.
A method of establishing a reference level for a touch signal, comprising:
- sensing a quiescent touch signal prior to an application of a touch force;
- detecting a touch signal responsive to the application of the touch force;
- and
- establishing a reference level for the touch signal based on one or more values of the touch signal acquired contemporaneously with the detection of the touch force.
The method of 38, wherein touch location information is first obtained at a peak of the touch signal.
The method of 38, wherein the predetermined time before touch location information is obtained is in a range of about 50 to 100 ms.
The method of 35, wherein detecting the touch signal responsive to the application of the touch force comprises detecting a triggering event associated with the application of the touch.
A touch screen system, comprising:
- a touch surface;
- a plurality of touch sensors, each of the touch sensors physically coupled to the touch surface and producing a force responsive signal in response to a touch applied to the touch surface;
- and
- a control system, coupled to the touch sensors and receiving the sensor signals, the control system configured to acquire a plurality of reference levels for the force responsive signal, select one or more of the plurality of reference levels based on information acquired from the force responsive signal, and determine the touch location using the one or more selected reference levels.
A touch screen display system, comprising:
- a touch screen system, including:
- a touch surface;
- a plurality of touch sensors, each of the touch sensors physically coupled to the touch surface and producing a force responsive signal in response to a touch applied to the touch surface;
- and
- a control system, coupled to the touch sensors and receiving the sensor signals, the control system configured to acquire a plurality of reference levels for the force responsive signal, select one or more of the plurality of reference levels based on information acquired from the force responsive signal, and determine the touch location using the one or more selected reference levels;
- and
- a display for displaying information through the touch screen system.
A display system, comprising:
- a touch screen system, including
- a touch surface;
- a plurality of touch sensors, each of the touch sensors physically coupled to the touch surface and producing a force responsive signal in response to a touch applied to the touch surface;
- and
- a control system, coupled to the touch sensors and receiving the sensor signals, the control system configured to acquire a plurality of reference levels for the force responsive signal, select one or more of the plurality of reference levels based on information acquired from the force responsive signal, and determine the touch location using the selected reference levels;
- a display for displaying information;
- and
- a processor coupled to the display and the touch screen system for processing data to be displayed on the display and information received from the touch screen system.
A system for determining a location of a touch on a touch screen, comprising:
- means for developing a plurality of reference levels for a force responsive touch signal;
- and
- means for determining the location of the touch using one or more of the plurality of established reference levels.
A system for determining a touch location on a touch screen, comprising:
- means for developing a first and a second reference level for a force responsive touch signal;
- and
- means for determining the touch location using at least one reference level of the first and the second reference levels.
A system for establishing a reference level for a touch signal used to determine a touch location, comprising:
- means for sensing a quiescent touch signal prior to an application of a touch force;
- means for detecting a touch signal responsive to the application of the touch force;
- means for establishing a reference level for the touch signal based on a value of the touch signal acquired contemporaneously with the detection of the touch force.
A computer-readable medium configured with executable instructions for causing one or more computers to perform a method of determining a location of a touch on a touch screen, the method comprising:
- acquiring a plurality of reference levels for a force responsive touch signal;
- selecting one or more of the plurality of reference levels based on information acquired from the touch signal;
- and
- determining the touch location using the selected reference levels.
Dependencies are inferred from the claim text.