Device for displaying digital information incorporating selection of picture pages and/or resolution enhancement
First Claim
1. A device for arranging digital information as a set of pixels which are displayed according to a line pattern in a two-dimensional area, said device comprising:
- a display memory for the storage of said digital information, an m-bit (m>
1) information word being stored for each of said pixels to be displayed, said display memory comprising a data output for outputting said m-bit information words;
a programmable color map memory for the storage of color information, said color map memory having a data output for outputting color information and an address input;
means for generating control signals;
means for connecting said data output of said display memory to said address input of said programmable color map memory, said connecting means comprising at least one connection line having a gate circuit including a first gate input connected to said data output of said display memory, a gate output connected to said address input of said programmable color map memory, and a control input connected to said generating means for receiving control signals, said gate circuit passing to said gate output, under the control of a first control signal applied at said control input, a first address comprising the m-bit information word to be displayed, said gate circuit also passing to said gate output, under the control of a second control signal applied at said control input, a second address comprising a selectable part of the m-bit information word to be displayed.
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Accused Products
Abstract
Digital information is usually displayed as a set of pixels which are arranged according to a line pattern within a two-dimensional area. For the storage of the information to be displayed, use is normally made of a picture memory. The content of an information pixel is stored in the memory as m bits (m>1). When use is made of a color map memory, the information can be displayed in different colors to be selected by a user. Selective display of the information is also possible, which means that only a selected number of the m bits are displayed. The invention provides a device for the display of digital information which enables selective display. In order to realize selective display, a device in accordance with the invention comprises a gate circuit with a control input on at least one connection between the display memory and the color map memory. Selective display in the form of picture pages and resolution enhancement is made possible by selected control signals on said control input.
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Citations
8 Claims
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1. A device for arranging digital information as a set of pixels which are displayed according to a line pattern in a two-dimensional area, said device comprising:
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a display memory for the storage of said digital information, an m-bit (m>
1) information word being stored for each of said pixels to be displayed, said display memory comprising a data output for outputting said m-bit information words;a programmable color map memory for the storage of color information, said color map memory having a data output for outputting color information and an address input; means for generating control signals; means for connecting said data output of said display memory to said address input of said programmable color map memory, said connecting means comprising at least one connection line having a gate circuit including a first gate input connected to said data output of said display memory, a gate output connected to said address input of said programmable color map memory, and a control input connected to said generating means for receiving control signals, said gate circuit passing to said gate output, under the control of a first control signal applied at said control input, a first address comprising the m-bit information word to be displayed, said gate circuit also passing to said gate output, under the control of a second control signal applied at said control input, a second address comprising a selectable part of the m-bit information word to be displayed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification