Simultaneous sensing arrangement
First Claim
1. A method of deriving touch information from a touch sensitive surface, the touch sensitive surface comprising a plurality of sensing points, each 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:
- simultaneously stimulating two of the plurality of drive lines during a time period with drive signals of the same frequency, wherein the drive signals are in phase during a first portion of the time period and out of phase during a second portion of the time period;
sensing a sense signal on at least one sense line, wherein the sense signal is related to the drive signals by touch or proximity of one or more objects to one or more sensing points associated with at least one of the two drive lines and the at least one sense line; and
deriving touch information from the sense signal.
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Accused Products
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.
213 Citations
23 Claims
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1. A method of deriving touch information from a touch sensitive surface, the touch sensitive surface comprising a plurality of sensing points, each 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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simultaneously stimulating two of the plurality of drive lines during a time period with drive signals of the same frequency, wherein the drive signals are in phase during a first portion of the time period and out of phase during a second portion of the time period; sensing a sense signal on at least one sense line, wherein the sense signal is related to the drive signals by touch or proximity of one or more objects to one or more sensing points associated with at least one of the two drive lines and the at least one sense line; and deriving touch information from the sense signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A touch sensing device comprising:
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a touch sensitive surface having a plurality of sensing points, each sensing point being associated with one of a plurality of drive lines and one of a plurality of sense lines; drive circuitry that applies drive signals simultaneously to two of the plurality of drive lines during a time period, wherein the drive signals have the same frequency and are in phase during a first portion of the time period and out of phase during a second portion of the time period; sense circuitry that detects a sense signal in at least one sense line, the sense signal being related to the drive signals by touch or proximity of one or more objects to one or more sense sensing points associated with the sense line, and derives 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, 18, 19, 20, 21, 22, 23)
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Specification