Multitouch touch device employing capacitive detection
AssigneeSafran Electronics & Defense Cockpit Solutions
InventorLaurent Chadirac
Life of this patent
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Abstract
A multitouch touch device (DIS) employing capacitive detection, including: a touch matrix array and a first voltage-generating source configured to generate, for each row and each column of the matrix array, a first input voltage having a first frequency leading to the generation of a first output voltage. The device also includes a second voltage-generating source for generating, for each intersection between at least two rows and two columns of the matrix array, a second input voltage having a second frequency different from the first frequency leading to the generation of a second output voltage. A processing circuit is configured to determine, depending on first and second reference values, whether the first and second output voltages are representative of a press and of its position.
Claims17
A multitouch touch device (DIS) employing capacitive detection comprising:
- a touch matrix array;
- a first voltage generator configured to generate for each row and each column of said matrix array, a first input voltage having a first frequency leading to the generation of a first output voltage, a second voltage generator configured to generate, for each intersection between at least two rows and two columns of said matrix array a second input voltage having a second frequency different from said first frequency leading to the generation of a second output voltage;
- and
- a processing circuit configured to determine, depending on first and second reference values, whether said first and second output voltages are representative of a press and of its position.
A method of capacitive detection for a multitouch touch device (DIS) comprising a touch matrix array, wherein:
- for each row and each column of said matrix array, generating a first input voltage having a first frequency leading to the generation of a first output voltage,
- for each intersection between at least two rows and two columns of said matrix array, generating a second input voltage having a second frequency different from said first frequency and leading to the generation of a second output voltage, and
- determining, according to a first and a second reference value, whether said first and second output voltages are representative of a press and of its position.
Dependencies are inferred from the claim text.