Touch sensitive device with stylus support
First Claim
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1. A touch sensitive system comprising:
- a touch panel comprising transparent capacitive sensing medium including a plurality of drive electrodes and a plurality of receive electrodes arranged to form a matrix and an insulating layer arranged between the plurality of drive electrodes and the plurality of receive electrodes, the matrix having a plurality of nodes defined by areas where the drive electrodes and the receive electrodes traverse one another;
a stylus drive unit configured to provide a stylus drive signal to a stylus electrode;
a stylus sense unit configured to generate stylus response signals from the stylus electrode, the stylus response signal comprising a differentiated representation of a sensing medium drive signal, the amplitude of the differentiated representation being responsive to the coupling capacitance between the stylus electrode and one of the plurality of drive electrodes, the stylus sense unit comprising receive electronics that are capable of resolving the location of a stylus tip relative to an unresolved axis;
a touch panel drive unit configured to generate a touch panel drive signal and deliver the touch panel drive signal to the drive electrodes in the touch panel one at a time;
a touch panel sense unit configured to generate, for each stylus drive signal delivered to the stylus electrode, touch panel response signals for the plurality of receive electrodes in the touch panel, an amplitude of each of the response signals being responsive to the coupling capacitance at the associated receive electrode in the touch panel;
a measurement unit configured to measure or receive input indicative of each of the amplitude of the stylus response signals and the amplitude of the touch panel response signals and to determine therefrom the position of the stylus electrode, if present, on the touch surfaces,wherein the touch sensitive system is configured to be switchable between distinct stylus receive and stylus drive modes, the operation of the stylus drive unit being associated with the stylus drive mode, and the operation of the stylus sense unit being associated with the stylus receive mode.
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Abstract
A touch-sensitive device with stylus includes a touch panel, a stylus drive unit, a stylus sense unit, a touch panel drive unit, and a measurement unit. A touch by a stylus proximate to a touch panel electrode changes a capacitive coupling between the touch panel electrode and a stylus electrode. The amplitude of the response signal is responsive to the capacitive coupling between the touch panel electrode and the stylus electrode, and is measured to provide an indication of the position of the stylus electrode relative to the touch panel.
165 Citations
19 Claims
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1. A touch sensitive system comprising:
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a touch panel comprising transparent capacitive sensing medium including a plurality of drive electrodes and a plurality of receive electrodes arranged to form a matrix and an insulating layer arranged between the plurality of drive electrodes and the plurality of receive electrodes, the matrix having a plurality of nodes defined by areas where the drive electrodes and the receive electrodes traverse one another; a stylus drive unit configured to provide a stylus drive signal to a stylus electrode; a stylus sense unit configured to generate stylus response signals from the stylus electrode, the stylus response signal comprising a differentiated representation of a sensing medium drive signal, the amplitude of the differentiated representation being responsive to the coupling capacitance between the stylus electrode and one of the plurality of drive electrodes, the stylus sense unit comprising receive electronics that are capable of resolving the location of a stylus tip relative to an unresolved axis; a touch panel drive unit configured to generate a touch panel drive signal and deliver the touch panel drive signal to the drive electrodes in the touch panel one at a time; a touch panel sense unit configured to generate, for each stylus drive signal delivered to the stylus electrode, touch panel response signals for the plurality of receive electrodes in the touch panel, an amplitude of each of the response signals being responsive to the coupling capacitance at the associated receive electrode in the touch panel; a measurement unit configured to measure or receive input indicative of each of the amplitude of the stylus response signals and the amplitude of the touch panel response signals and to determine therefrom the position of the stylus electrode, if present, on the touch surfaces, wherein the touch sensitive system is configured to be switchable between distinct stylus receive and stylus drive modes, the operation of the stylus drive unit being associated with the stylus drive mode, and the operation of the stylus sense unit being associated with the stylus receive mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A touch sensitive system comprising:
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a touch panel comprising capacitive sensing medium including a matrix of drive electrodes and receive electrodes, the matrix having a plurality of nodes defined by areas where the drive electrodes and the receive electrodes traverse one another; a stylus drive unit configured to provide a stylus drive signal to at least one of the receive electrodes from a stylus; a stylus sense unit configured to measure stylus response signals received by the stylus from at least one of the drive electrodes, the amplitude of the stylus response signals being responsive to the coupling capacitance between the stylus and one of the plurality of drive electrodes; a touch panel drive unit configured to generate a touch panel drive signal and deliver the touch panel drive signal to the drive electrodes in the touch panel and to the stylus; a touch panel sense unit configured to generate, for each stylus drive signal delivered from the stylus, response signals on at least one of the plurality of receive electrodes in the touch panel, an amplitude of each of the response signals being responsive to the coupling capacitance between the stylus and the associated receive electrode in the touch panel; a measurement unit configured to measure or receive input indicative of each of the amplitude of the stylus response signals and the amplitude of the touch panel response signals and to determine therefrom the position of the stylus, if present, on the touch surfaces, wherein the touch sensitive system is configured to be switchable between distinct stylus receive and stylus drive modes, the operation of the stylus drive unit being associated with the stylus drive mode, and the operation of the stylus sense unit being associated with the stylus receive mode.
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Specification