DRIVING CIRCUIT FOR OPERATING ELECTROLUMINESCENCE DISPLAY WITH HIGH CONTRAST

摘要

An improved drive circuit for operating an electroluminescent display includes a circuit for basing column and row drivers to maximize the energization voltage for illuminated pixels 9 without reducing the contrast of the display. The energization voltages for the row and column drivers are combined with reverse biased de-energization voltages for inactivated pixels so that the applied voltage is less than the forming voltage. Interface circuitry is also provided for detecting the beginning of valid data for each line to be displayed, checking the selected display mode of the line and adjusting the timing of a system clock to display completely and uniformly characters in the 40-column, 80-column or graphics display mode.