Abstract: A data processing device is provided with a liquid crystal display incorporating electroluminescent backlighting, in which the electroluminescent backlighting panel is provided with several degrees of luminosity. A selection circuit specifies the degree of luminosity to allow the electroluminescent backlighting panel to generate the selected luminosity level.

Abstract: A data processing device is provided with a liquid crystal display incorporating electroluminescent backlighting, in which the electroluminescent backlighting panel is provided with several degrees of luminosity. A selection circuit specifies the degree of luminosity to allow the electroluminescent backlighting panel to generate the selected luminosity level.

Abstract: A data processing machine which is provided with a liquid crystal display unit having an electroluminescent panel functioning as the backlighting source of the liquid crystal display unit, which includes a circuit for counting the period during which the electroluminescent panel is inoperative and a control circuit that extinguishes the illumination of the electroluminescent panel in response to a signal output from the time-counting circuit. Furthermore, a circuit indicating to the operator that the extinguished illumination of the electroluminescent panel is due to operation of the above controlled circuit can also be provided.

Abstract: A data processing machine is provided with a microprocessor that functions in response to signals output by a clock oscillator to selectively change the data-processing speed of the microprocessor. The data processing machine contains a circuit for generating interruption signals at specific intervals by dividing the signals output by the clock oscillator, a signal-input device for inputting command signals that cause the microprocessor to change the data-processing speed, and a controller which, in response to signals from the input device, executes a stand-by process each time a specific number of interruption signals generated by the interruption signal generating circuit is received.

Abstract: A liquid crystal display device includes a video RAM for storing character and graphic data, a control circuit for selecting specific data from the RAM to be displayed on a liquid crystal display panel, and a positive/negative mode selector for selecting one of a positive display mode in which data is displayed as lighted elements against a dark background, and a negative display mode in which data is displayed as dark elements against a lighted background. The display device allows the use of software developed for CRT based data processors to be run in LCD mounted data processors in which the data formats would otherwise be reversed.