Simultaneous sensing arrangement

摘要

Multi-touch touch-sensing devices and methods are described herein. The touch sensing devices can include multiple sense points, each located at a crossing of a drive line and a sense line. In some embodiments, multiple drive lines may be simultaneously or nearly simultaneously stimulated with drive signals having unique characteristics, such as phase or frequency. A sense signal can occur on each sense line that can be related to the drive signals by an amount of touch present at sense points corresponding to the stimulated drive lines and the sense line. By using processing techniques based on the unique drive signals, an amount of touch corresponding to each sense point can be extracted from the sense signal. The touch sensing methods and devices can be incorporated into interfaces for a variety of electronic devices such as a desktop, tablet, notebook, and handheld computers, personal digital assistants, media players, and mobile telephones.

主权项

1. A method of deriving touch information from a touch sensitive surface, the touch sensitive surface comprising a plurality of sensing points, a sensing point being located at a crossing of a drive line and a sense line, the method comprising:
performing a first scan in a first region of the touch sensitive surface to determine whether a touch is present within the first region, the first region corresponding to a first plurality of drive lines, wherein the first scan in the first region comprises: simultaneously stimulating a plurality of drive lines corresponding to the first region with one or more first drive signals; sensing first sense signals on a plurality of sense lines, wherein the first sense signals are related to the one or more first drive signals by touch or proximity of one or more objects to one or more sensing points located at a crossing of the plurality of drive lines and the at least one sense line; and determining whether a touch is present within the first region based on the first sense signals; when the touch is present in the first region, performing a second scan in the first region, wherein performing the second scan in the first region comprises:
further stimulating the plurality of drive lines with a plurality of second drive signals;further sensing second sense signals on the plurality of sense lines, wherein the second sense signals are related to the plurality of second drive signals by touch or proximity of the one or more objects to the one or more sensing points; andderiving touch information for sensing points corresponding to the first region from the second sense signals; and when the touch is not present in the first region, performing the first scan in a second region of the touch sensitive surface, wherein the second region corresponds to a second plurality of drive lines.