Patent EP-0099469-A2 (EP)
Inventor: MISSBACH HILMAR DIPL-ING
IPC: G06K15/00
Filed: 1983-06-13
Abstract: 1. Circuit arrangement for the representation of texts, graphics and symbols on the image screen of a monitor or colour television receiver and for the issue of the information to peripheral devices, such as printers, in which the received information is filed page by page in a page store (3) and the address for the respective location on the image screen is determined, by a computer control unit (1) by means of a readable character store (2), for each point element of a character to be represented and the representational information of the point element is filed in a data store under the determined address and the colour data associated with a character are filed in an attribute store (6), which point elements and colour data are read out by a control equipment (7) and, one interlinked with the other, converted in a video signal generating circuit into video signals reproduceable on the image screen or issued to peripheral devices, characterised by the following features : The data of the coded text information, which is received page by page, is filed in the page store (3) (random access memory) to be readable under the control of the computer control unit (1) ; the coded data of all reproduceable data are fixedly recorded in a character store (2) (read-only memory) provided as program store ; the computer control unit (1) reads the data of the text information of each character place out of the page store and determines the data relating to an individual representation point of a character with access to the character store (2) and issues these with the associated address for the place of representation on the image screen by way of an address and data bus (A, B) ; the point-oriented data are recorded by the computer control unit (1) under the address, which is related to character place, in a point store (8), which is provided as full picture store, during the vertical black-out time in the line-by-line representation of the text on the image screen, wherein the point-oriented data are switching functions and/or point-related colour addresses for the following logic system ; the colour and representation attributes, for example colours of foreground and background, multi-colour DRCS or flashing, associated which each character place are determined by the computer control unit (1) with the aid of the information in the page store and at the same time filed in an attribute store (6) ; the data in the point store (8) and the attribute store (6) are the addresses for a colour store (16, 17) connected therebehind ; the control equipment (7) reads out the data, which are contained in the dynamic point store (8) and in the attribute store (6), addressed and synchronised with the deflection of the electron beam of the image tube (1) or with the operating speed of the peripheral device and conducts these by way of point shift registers (11, 12) associated with the stores (6, 8) to a multiplex circuit (15), which is switchable over from the switching functions filed in the point store as well as also from character-place-related attributes in the attribute store in the manner that a switching function for a representation point switches over the multiplexer (15) and calls up the colours of foreground and background or representational information filed under the associated address in the attribute store (6) out of the colour store (16, 17) and that the multiplexer (15) furthermore switches over in dependence on a character-place-related multicolour information or another point-related representational information filed in the attribute store (6) and issues the point-related colour data and representational data filed under the same character place address in the point store to the colour store (16, 17) connected therebehind and calls up the corresponding colour information ; the control unit (7) issues the point-related colour data and shifts them either into a matrix circuit (18) with integrated digital converter, from which the RGB signals for the driving of the image tube are derivable, or to the output as point-related information for peripheral devices.