Minimum move touch plane scanning method and device
First Claim
1. An integrated circuit that provides compatibility with a plurality of a touch plane operator input device, comprising:
- a microprocessor; and
a touch device interface that interfaces the microprocessor to a touch plane operator input device, the touch device interface is compatible with a plurality of touch plane operator input devices and automatically detects the type of the touch plane operator input device comprising a touch pad, an analog resistive touch screen, a capacitive touch screen and an electrostatic touch screen, the touch device interface further automatically detects type of the analog resistive touch screen comprising a 4-wire touch screen, a 5-wire touch screen, a 7-wire touch screen, or an 8-wire touch screen, wherein the 5-wire touch screen comprises a wiper terminal, the 7-wire touch screen comprises two voltage feedback terminals and the 8-wire touch screen comprises four voltage feedback terminals.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of determining a type of touch plane operator input device comprises sensing the impedance across first and second terminals of a touch plane operator input device to distinguish the touch plane operator input device as being one of at least two different types of touch plane operator input devices. A method of processing an input from a touch plane operator input device comprises determining a first location of a first touch on the touch plane operator input device; determining a second location of a second touch on the touch plane operator input device; comparing the first and second locations to obtain an indication of an amount of difference between the first and second locations; and determining whether the indication of the amount of difference exceeds a predetermined amount. These steps are performed by discrete logic circuitry that provides an event notification to a microprocessor when the indication of the amount of difference exceeds the predetermined amount. An interface circuit for a touch plane operator input device comprises a digital signal processor that includes a data processing path along which data from a touch plane operator input device passes while being processed by the digital signal processor. The interface circuit is capable of processing data from first and second different types of touch plane operator input devices. The data path is a common data processing path that is the same for input data for both of the first and second types of touch plane operator input devices.
28 Citations
19 Claims
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1. An integrated circuit that provides compatibility with a plurality of a touch plane operator input device, comprising:
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a microprocessor; and a touch device interface that interfaces the microprocessor to a touch plane operator input device, the touch device interface is compatible with a plurality of touch plane operator input devices and automatically detects the type of the touch plane operator input device comprising a touch pad, an analog resistive touch screen, a capacitive touch screen and an electrostatic touch screen, the touch device interface further automatically detects type of the analog resistive touch screen comprising a 4-wire touch screen, a 5-wire touch screen, a 7-wire touch screen, or an 8-wire touch screen, wherein the 5-wire touch screen comprises a wiper terminal, the 7-wire touch screen comprises two voltage feedback terminals and the 8-wire touch screen comprises four voltage feedback terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A methodology for providing compatibility for a touch device interface, comprising:
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determining automatically type of a touch plane operator input device comprising a touch pad, an analog resistive touch screen, a capacitive touch screen and an electrostatic touch screen; determining automatically subtype of the touch plane operator input device for the analog resistive touch screen comprising a 4-wire touch screen, a 5-wire touch screen, a 7-wire touch screen, or an 8-wire touch screen based at least in part upon interface characteristics of the touch plane operator input device, the interface characteristics being determined based upon impedance characteristics of the touch plane operator input device; and configuring the touch device interface to operate with the touch plane operator input device. - View Dependent Claims (12, 13, 14, 15)
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16. A system that provides compatibility for a touch device interface, comprising:
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means for discovering automatically type of a touch plane operator input device comprising a 4-wire analog resistive touch screen, a 5-wire analog resistive touch screen, a 7-wire analog resistive touch screen, or an 8-wire analog resistive touch screen based at least in part upon interface characteristics of the touch plane operator input device; means for configuring the touch device interface to operate with the touch plane operator input device; means for receiving a first coordinate based upon a first touch on the touch plane operator input device; means for receiving a second coordinate based upon a second touch on the touch plane operator input device; means for differentiating significant inputs to the touch plane operator device from insignificant inputs based upon the displacement between the first coordinate and the second coordinate; and means for alerting a microprocessor when a significant input is detected. - View Dependent Claims (17, 18, 19)
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Specification