Touch sensor panel with multi-power domain chip configuration
First Claim
1. A touch sensing system comprising:
- a guard signal generation chip operating in a first power domain referenced to a first voltage, the guard signal generation chip configured to generate a guard signal;
a touch sensing chip operating in a second power domain, different from the first power domain, referenced to the guard signal, the touch sensing chip configured to sense touch at one or more touch electrodes included in a touch sensor panel operating in the second power domain referenced to the guard signal, and the touch sensing chip a different chip than the guard signal generation chip,wherein;
the touch sensing chip is configured to receive a low voltage at a low voltage input node of the touch sensing chip, and a high voltage at a high voltage input node of the touch sensing chip,the low voltage corresponds to the guard signal, andthe high voltage is generated based on at least the guard signal and is referenced to the guard signal.
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Abstract
A touch sensing system is disclosed. The touch sensing system includes a guard signal generation chip operating in a first power domain referenced to a first voltage, the guard signal generation chip configured to generate a guard signal. A touch sensing chip operates in a second power domain, different from the first power domain, referenced to the guard signal, the touch sensing chip configured to sense touch at one or more touch electrodes included in a touch sensor panel operating in the second power domain referenced to the guard signal, and the touch sensing chip a different chip than the guard signal generation chip. A voltage regulator is configured to selectively regulate a voltage of the guard signal at the touch sensing chip.
137 Citations
19 Claims
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1. A touch sensing system comprising:
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a guard signal generation chip operating in a first power domain referenced to a first voltage, the guard signal generation chip configured to generate a guard signal; a touch sensing chip operating in a second power domain, different from the first power domain, referenced to the guard signal, the touch sensing chip configured to sense touch at one or more touch electrodes included in a touch sensor panel operating in the second power domain referenced to the guard signal, and the touch sensing chip a different chip than the guard signal generation chip, wherein; the touch sensing chip is configured to receive a low voltage at a low voltage input node of the touch sensing chip, and a high voltage at a high voltage input node of the touch sensing chip, the low voltage corresponds to the guard signal, and the high voltage is generated based on at least the guard signal and is referenced to the guard signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An electronic device comprising:
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a touch sensor panel including one or more touch electrodes; a guard signal generation chip operating in a first power domain referenced to a first voltage, the guard signal generation chip configured to generate a guard signal; a touch sensing chip operating in a second power domain, different from the first power domain, referenced to the guard signal, the touch sensing chip configured to sense touch at the one or more touch electrodes included in the touch sensor panel operating in the second power domain referenced to the guard signal, and the touch sensing chip a different chip than the guard signal generation chip, wherein; the touch sensing chip is configured to receive a low voltage at a low voltage input node of the touch sensing chip, and a high voltage at a high voltage input node of the touch sensing chip, the low voltage corresponds to the guard signal, and the high voltage is generated based on at least the guard signal and is referenced to the guard signal.
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19. A method for operating a touch sensing system, the method comprising:
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operating a guard signal generation chip in a first power domain referenced to a first voltage, the guard signal generation chip configured to generate a guard signal; operating a touch sensing chip in a second power domain, different from the first power domain, referenced to the guard signal, the touch sensing chip configured to sense touch at one or more touch electrodes included in a touch sensor panel operating in the second power domain referenced to the guard signal, and the touch sensing chip a different chip than the guard signal generation chip, wherein; the touch sensing chip is configured to receive a low voltage at a low voltage input node of the touch sensing chip, and a high voltage at a high voltage input node of the touch sensing chip, the low voltage corresponds to the guard signal, and the high voltage is generated based on at least the guard signal and is referenced to the guard signal.
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Specification