Abstract: In an interlaced picture display device by means of which signal patterns are displayed which are uniform from field to field as obtained from character generators vertical jitter and flicker phenomena are greatly reduced by attenuating the uppermost picture element of a sequence of subjacent bright picture elements in one field in combination with attenuation of the bottommost picture element in the other field or in combination with the addition of an attenuated picture element of the bottommost picture element of one field.

Abstract: To display bivalent color signals in a monochrome picture display device so that the original color remains recognizable by choosing a suitable luminance ratio, and colors having a low brightness are displayed with a sufficient degree of visibility, the combination of a sum signal and a correction signal is formed from the bivalent color signal, wherein the color differences are derived from the sum signal and the correction signal ensures the basic luminance.

Abstract: A device for displaying page data on a television monitor, having a foreground memory and a background memory. The foreground memory has a capacity of one page of text. The background memory has serial sub-memories connected in parallel, each sub-memory containing part of a character, so that together the sub-memories contain the relevant character within a series of characters. The characters become serially available on the outputs of the sub-memories for transfer, to the foreground memory. The sub-memories may be magnetic bubbles. Each of said sub-memories preferably is a single loop so that intermediate control during the transfer of a page of data is very simple. The foreground memory is preferably a random access memory which can be addressed. The output of the memory has connected to it a counter with sub-counting cycles having a length of one line on the display apparatus in order to form the lines to be displayed thereon.