Flicker reduction in a display system with screen memory.

摘要

Operation of an AC plasma display panel 34 requires the three control operations of write, erase, and sustain. A read only store 18 is partitioned into two sets of addressable arrays 12,13,14; 15,16,17. The addressing of the store selects the set in response to a brightness control 19 and the array within the selected set in response to the required operation. Each array defines a sequence of screen activities, the slower write and erase operations being associated with plural faster sustain operations so that the average screen activity rate for the arrays of each set is the same, the rates for the two sets being respectively maximum and minimum. The brightness control selects intermediate brightness levels by switching repetitively between the two partitions for appropriate intervals but at rates not apparent to the eye of the user.