Control unit for a display member

Details Control unit for a display member Control unit for a display member

G - Physics

09

G

375/18

G09G 3/00 (2006.01) G06K 15/10 (2006.01) G09G 5/40 (2006.01)

Patent

CA 1184680

- 1 - ABSTRACT OF THE DISCLOSURE A display member, for example a visual display unit presents symbols which are divided into modules. Each module consists of a dot matrix. A refresh memory has one word for each module on the visual display unit. Out of the words in the refresh memory, which correspond to the modules of a symbol, one word contains a symbol code and the other words define the dot matrices of the modules. Control information in each word indicates if the word is a symbol code or a dot matrix. A code transformation memory is supplied with the symbol code and has a word at an address indicated by the symbol code, which word defines the dot matrix of the module in question. A selector forwards to the display member, in dependence on the control information, the word read from the refresh memory if the control information indicates that the word defines a dot matrix, and forwards the word read out from the code trans- formation memory if the control information indicates that the word read out from the refresh memory is a symbol code.

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