SIMULTANEOUS SENSING ARRANGEMENT
First Claim
1. A method of stimulating a touch sensitive surface, the touch sensitive surface comprising a plurality of sensing points, a sensing point being associated with at least one of a plurality of drive lines and at least one of a plurality of sense lines, the method comprising:
- stimulating a first drive line of the plurality of drive lines with a first drive signal during a first time period; and
stimulating a second drive line of the plurality of drive lines with a second drive signal during a second time period, the second time period at least partially overlapping the first time period during an overlapping time period;
wherein the first and second drive signals have the same frequency and are in phase during a first portion of the overlapping time period and out of phase during a second portion of the overlapping time period.
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Abstract
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.
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Citations
25 Claims
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1. A method of stimulating a touch sensitive surface, the touch sensitive surface comprising a plurality of sensing points, a sensing point being associated with at least one of a plurality of drive lines and at least one of a plurality of sense lines, the method comprising:
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stimulating a first drive line of the plurality of drive lines with a first drive signal during a first time period; and stimulating a second drive line of the plurality of drive lines with a second drive signal during a second time period, the second time period at least partially overlapping the first time period during an overlapping time period; wherein the first and second drive signals have the same frequency and are in phase during a first portion of the overlapping time period and out of phase during a second portion of the overlapping time period. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A touch sensing device comprising:
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drive circuitry configured to; apply a first drive signal to a first drive line of a plurality of drive lines during a first time period; and apply a second drive signal to a second drive line of the plurality of drive lines during a second time period, the second time period at least partially overlapping the first time period during an overlapping time period, wherein the first and second drive signals have the same frequency and are in phase during a first portion of the overlapping time period and out of phase during a second portion of the overlapping time period; and sense circuitry configured to; detect a sense signal from at least one sense line, the sense signal being related to the first and second drive signals by touch or proximity of one or more objects to one or more sensing points associated with the at least one sense line, a sensing point being associated with at least one of the plurality of drive lines and at least one of a plurality of sense lines; and derive touch information for the one or more sensing points from the sense signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. 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:
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performing a coarse scan of 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; when a touch is present in the first region, performing a fine scan of the first region; and when a touch is not present in the first region, performing a coarse scan of a second region of the touch sensitive surface, wherein the second region corresponds to a second plurality of drive lines. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A touch sensing device comprising:
drive circuitry configured to; perform a coarse scan of 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; perform a fine scan of the first region when a touch is present in the first region during the course scan; and perform a coarse scan of a second region of the touch sensitive surface when a touch is not present in the first region, wherein the second region corresponds to a second plurality of drive lines. - View Dependent Claims (25)
Specification