Video display system
First Claim
1. A control apparatus for a raster scan video display having a plurality of video display lines comprising:
- a composite memory for storing data indicative of a video display includinga managing memory having a plurality of line composition data words, one line composition data word for each video display line, each line composition data word indicating the composition of the data for the corresponding video display line, anda zone memory having a plurality of memory zones, one memory zone corresponding to each video display line, each memory zone including image data indicative of the image data having the corresponding video display line, said image data having the composition indicated by the corresponding line composition data word;
a central processing unit connected to said composite memory for controlling the composition of the video display by controlling the data stored in said managing memory and said zone memory;
a time base unit for generating time base signals in synchronization with the raster scan of the video display; and
a video display processor connected to said composite memory and said time base unit for generating at least one video display control signal for formation of the video display by recall of said line composition data word from said managing memory corresponding to the current video display line, recalling said image data from said zone memory corresponding to successive pixels of the current video display line and forming said at least one video control signal in accordance with said recalled image data for each pixel of the current video display line by interpreting said image data in accordance with said composition indicated by said recalled line composition data word.
0 Assignments
0 Petitions
Accused Products
Abstract
In this apparatus, a composite memory 5 includes a managing memory (5g) containing for each line of the frame to be displayed, a word made up of information relating to the composition of the line in question. This information can define a base color, the number of memory planes, and, if appropriate, a base address of a zone of a zone memory (5z) which contains the data relating to the parts of the image which contain only typographic or graphic information. If the number of planes is equal to zero, said base color becomes a constant background color in the totality of the line to be displayed. The contents of the control memory are read out, word by word, from the control memory at the frequency of the line synchronization signal for the screen.
Application to teletext systems.
90 Citations
9 Claims
-
1. A control apparatus for a raster scan video display having a plurality of video display lines comprising:
-
a composite memory for storing data indicative of a video display including a managing memory having a plurality of line composition data words, one line composition data word for each video display line, each line composition data word indicating the composition of the data for the corresponding video display line, and a zone memory having a plurality of memory zones, one memory zone corresponding to each video display line, each memory zone including image data indicative of the image data having the corresponding video display line, said image data having the composition indicated by the corresponding line composition data word; a central processing unit connected to said composite memory for controlling the composition of the video display by controlling the data stored in said managing memory and said zone memory; a time base unit for generating time base signals in synchronization with the raster scan of the video display; and a video display processor connected to said composite memory and said time base unit for generating at least one video display control signal for formation of the video display by recall of said line composition data word from said managing memory corresponding to the current video display line, recalling said image data from said zone memory corresponding to successive pixels of the current video display line and forming said at least one video control signal in accordance with said recalled image data for each pixel of the current video display line by interpreting said image data in accordance with said composition indicated by said recalled line composition data word. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A control apparatus for a raster scan video display comprising:
-
a composite memory for storing data indicative of a video display including a managing memory having a plurality of line composition data words, one line composition data word for each video display line, each line composition data word indicating the composition of the data for the corresponding video display line, and a zone memory having a plurality of memory zones, one memory zone corresponding to each video display line, each memory zone including image data indicative of the image of the corresponding video display line, said image data having the composition indicated by the corresponding line composition data word; a time base unit for generating time base signal in synchronization with the raster scan of the video display; and a video display processor connected to said composite memory and said time base unit for generating at least one video display control signal for formation of the video display by recall of said line composition data word from said managing memory corresponding to the current video display line, recalling said image data from said zone memory corresponding to successive pixels of the current video display line and forming said at least one video control signal in accordance with said recalled image data for each pixel of the current video display line by interpreting said image data in accordance with said composition indicated by said recalled line composition data word. - View Dependent Claims (8, 9)
-
Specification