Intergraph Corporation

Christopher L Thomas

Bruce E Imsand

A system for processing video data to be displayed comprises a controller and a monitor. The controller includes a memory for storing the digital data to be displayed and apparatus for sequentially reading data from the memory. The data from the controller is conducted in digital form to the separately housed monitor separated from the controller. In the monitor, the digital data is converted into analog form and displayed. In the converting process, the digital data is first converted to an analog current and then the analog current is converted to a voltage. An additional voltage-to-voltage conversion may occur to isolate the capacitance of the display device. This system is particularly suited for high resolution systems (greater than 1000.times.1000 pixels) in which a new pixel is refreshed at least every 10 nanoseconds.

Video circuit including a digital-to-analog converter in the monitor

A deflection circuit for a television includes two semiconductor switching elements connected in series. Separate control circuits are provided for each semiconductor switching element to control the operation of the respective switching element. Each control circuit receives a control signal and is connected to a voltage source. For the control circuit associated with the switching element which receives the highest voltage, connection to the voltage source and the control signal is through diodes which provide common mode isolation. This control circuit includes a capacitor which provides energy for the control circuit when the diode connecting it to the voltage source is reverse biased.

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Harvest, AL, United States of America

Christopher L Thomas