A digital display device which has a delay circuit for operating a segment on-off driver so that when the ambient temperature at the time of renewing display is lower than a predetermined value, an OFF signal is sent to an ON segment and then, after the lapse of a predetermined time, an ON signal is sent to an OFF segment. Consequently, the overlap time between the segment to which an OFF signal was newly transmitted and the segment to which an ON signal was newly transmitted, can be made very short or eliminated whereby the discriminatability is improved to prevent misunderstanding of the display.

In a matrix array liquid crystal display on silicon with an a.c. drive involving periodic reversal of the potential of the counter-electrode this reversal is liable to produce a significant r.m.s. error voltage at each reversal. The OFF element error voltage is effectively eliminated by blanking all picture elements at the commencement of each reversal, and the ON error voltage more evenly shared by making this reversal occur after a non-integral number of frame scans.

An improved digital display driving circuit is provided. The display includes first and second display digits, the first display digit and second display digit being respectively formed by a plurality of segment electrodes, at least one digit electrode spaced apart from the segment electrodes and material disposed between the segments electrode and the digit electrode. Regions of the material are adapted to be rendered visually distinguishable from adjacent regions by the application of an electric field across the region. The regions of the material in registration with the segment electrodes are rendered visually distinguishable in response to a predetermined potential difference being applied across any one of the respective spaced apart segment electrodes and the digit electrodes. The invention is characterized by the first digit electrode and second digit electrode being referenced during alternating driving intervals of time to a potential such that the regions of the material in registration therewith are prevented from being rendered visually distinguishable. Each of the segment electrodes forming the first digit are coupled to a corresponding segment electrode forming the second digit to define a plurality of segment electrode pairs. A memory includes a plurality of outputs coupled to each pair of segment electrodes to reference each pair of electrodes to one of a first drive potential and second drive potential to be compared during each driving interval of time with the potential of the respective digit electrodes spaced apart therefrom, and a shift register adapted to receive a drive signal and in response thereto write-in the drive signal to the memory prior to each driving interval of time.

In a driving circuit for an electrochromic display device of the type wherein a clock signal is applied to the common electrode segment, and a driving signal having a different level from that of the clock signal is applied to the display segment electrode in response to the clock signal and a display decoder output, thereby effecting display and termination thereof by using a single source, gate circuit means is provided for preventing short-circuiting of the electrodes caused by the delay time between the clock signal and the driving signal.

In a display apparatus having an LED dot matrix display unit (16.times.16 LEDs), shift registers, row drivers, a row select driver, etc., since the off-time of driver element (transistors) is relatively long as compared with high-frequency clock (about 15 MHz), LEDs are erroneously turned on. To overcome this problem, when LEDs for a row to be activated are scanned from the first row to the second row, for instance, the row select driver is disabled (LEDs are kept turned off) from when the first row select driver circuit is turned off to when the second last column register driver circuit (15th column register driver circuit) has been perfectly turned off. To eliminate the influence of a relatively long off-time of driver transistors as compared with the high-frequency clock in the dot matrix display apparatus, a current row select driver circuit is turned off a time period before a carry signal rises for storing image data and a succeeding row select driver circuit is turned on a time period after the carry signal falls.