Driver circuits for dot matrix display apparatus

Details Driver circuits for dot matrix display apparatus Driver circuits for dot matrix display apparatus

1987-09-15

1990-05-08

Oberley, Alvin

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340762, G09G 320, G09G 332

Patent

active

049242172

ABSTRACT:
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.

REFERENCES:
patent: 3909788 (1975-09-01), Kaelin et al.
patent: 3973254 (1976-08-01), Nomiya et al.
patent: 4647927 (1987-03-01), Ichikawa et al.

Affiliated with

Also associated with

Rating

Driver circuits for dot matrix display apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Driver circuits for dot matrix display apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Driver circuits for dot matrix display apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2352027