Hewlett-Packard Development Company, L.p.

Verifone Gmbh

Keith Eric McIntyre

John F Sheets

Dave Faoro

Curtis Watson

Keven Paul Morlang

Dominique Andre Jean Gougeon

Data entry apparatus comprising a display screen device, a touch pad mounted over the display screen device, and an application processor coupled to the touch pad and to the display screen device. The application processor has an application program processing module and a touch pad controller module. The application program processing module displays on the display screen a predefined data entry screen having a prearranged set of functional components and sends to the touch pad controller module a hot spot command defining a plurality of touch pad hot spots corresponding in area and location to the set of functional components. The touch pad controller module senses a touch event on the touch pad corresponding to one of the touch pad hot spots and sends to the application processor a touch event message identifying the touch pad hot spot corresponding to the touch event. PIN entry commands are issued by the application processor module and processed in the touch pad controller for secure PIN entry on the touch screen.

Method and apparatus for touch screen data entry

A method for operating a combination touch pad and display screen device as a PINpad for entering a A plurality of numerical keypad layouts for the display screen are defined. Each keypad layout has a unique arrangement of decimal number locations differing from one layout to all others. For each PIN entry event a random one of the numerical keypad layouts is selected and displayed on the display screen.

Method for secure pin entry on touch screen display

A method for data communication between a multiplicity of devices coupled to a LAN Bus without data transmission collisions. Each device is assigned a unique device address and a unique transmit time slot based thereon. The method involves responding to each data character received in each receiving device by loading a LAN.TIMESTAMP parameter with the CUR.SYS.TIME parameter. Thus the LAN.TIMESTAMP parameter indicates the time of the last data character when an incoming data packet terminates. Packet termination is declared when the LAN Bus is quiescent for a period after the last character equal to the PKT.END.DELAY value which is preselected. The method also involves determining whether the value of CUR.SYS.TIME represents a point in the unique transmit time slot for the device and then in response to determining that CUR.SYS.TIME is within the time slot, initiating the transmission of data if available, or otherwise, setting a new LAN.TIMESTAMP value. The method also involves invoking a transmit throttle after a device has finished transmitting a packet on the LAN Bus to provide fairness in LAN Bus access.

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Roseville, CA, United States of America

Keith Eric McIntyre