Abstract: A data processing method includes, at an external computer, originating a ready control signal and, at a host, receiving the ready control signal. In response to the ready control signal, a control signal is produced by the host. In response to the control signal, a switch selectively couples one of the host and the first computer to a telecommunication device.

Abstract: A circuit assembly detects a touch point within a display area. A plurality of light emitters are disposed around a periphery of the display area. A plurality of detectors are disposed around the periphery, each detector being opposed to a respective light emitter. Switching circuitry for connecting the light emitters and detectors in a switching matrix has a plurality of matrix rows and matrix columns. The switching circuitry includes a plurality of row lines, each row line corresponding to a respective matrix row and a plurality of column lines, each column line corresponding to a respective matrix column. Low-side switching transistors selectably couple the light emitters and detectors to the row and column lines, respectively. A common modulated signal is coupled to the anodes of all the light emitters. A detection signal is provided by connecting the collector terminals for the detector phototransistors in common. Consequently, high-side multiplexing circuits are avoided.

Abstract: A circuit assembly detects a touch point within a display area. A plurality of light emitters are disposed around a periphery of the display area. A plurality of detectors are disposed around the periphery, each detector being opposed to a respective light emitter. Switching circuitry for connecting the light emitters and detectors in a switching matrix has a plurality of matrix rows and matrix columns. The switching circuitry includes a plurality of row lines, each row line corresponding to a respective matrix row and a plurality of column lines, each column line corresponding to a respective matrix column. Low-side switching transistors selectably couple the light emitters and detectors to the row and column lines, respectively. A common modulated signal is coupled to the anodes of all the light emitters. A detection signal is provided by connecting the collector terminals for the detector phototransistors in common. Consequently, high-side multiplexing circuits are avoided.

Abstract: A data processing method includes, at an external computer, originating a ready control signal and, at a host, receiving the ready control signal. In response to the ready control signal, a control signal is produced by the host. In response to the control signal, a switch selectively couples one of the host and the first computer to a telecommunication device.

Abstract: A method and apparatus is provided to control the brightness of an emissive display. Specifically, the brightness is incremented and decremented as the ambient environment becomes brighter and darker, respectively. A timing feature is also implemented to control the sensitivity of the system. Specifically, the time between adjustments of the display brightness is at least partially dependent on the magnitude of the difference between the desired brightness based on the ambient lighting environment and that of the actual display brightness.