SIMULTANEOUS SENSING ARRANGEMENT
First Claim
1. A touch sensing device comprising:
- 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 different frequencies;
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 sensing points associated with the sense line, and derives touch information for the one or more sensing points from the sense signal.
0 Assignments
0 Petitions
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.
141 Citations
18 Claims
-
1. A touch sensing device comprising:
-
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 different frequencies; 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 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 (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method of driving a touch sensitive module having a plurality of electrically conductive lines, the method comprising:
-
simultaneously stimulating two of the plurality of lines with drive signals of different frequencies; sensing at least one sense signal on at least one of the plurality of lines, wherein the sense signal is related to a contact or proximity event of at least one object near the plurality of lines; and deriving touch information from the sense signal. - View Dependent Claims (16, 17, 18)
-
Specification