Circuit arrangement for controlling the display of a cursor symbol of variable magnitude and shape in a cursor field of variable magnitude
First Claim
Patent Images
1. A display device, comprising:
- image generating means for generating an image in a raster scan format of pixels, said image generating means comprising cursor generating means for cursor generating and mixing means fed by said cursor generating means for mixing said cursor into said raster scan format for displaying, said cursor generating means comprisinginput means for receiving recurrent scanning control signals comprising a pixel clock signal,indicator means for indicating the position of a cursor field in the image,clip means fed by said input means and by said indicator means for generating a binary cursor window signal,a cursor memory having a plurality of locations each for storing a data word, all stored data words indicating at least one cursor pattern,addressing means fed by said input means and by said clip means for under control of a first value of said binary cursor window signal accessing successive locations for outputting data words, thereby advancing to each next location after a number of pixel clock signals which corresponds to the number of bits of each data word divided by a first number of bits used for the display of each cursor pixel,parallel-serial converter means for receiving each data word output by said memory and for supplying the first number of different consecutive bits of the received data word at each pixel clock signal which occurs during the first value of said binary cursor window signal,switch means controlled by said binary cursor window signal and fed by the parallel-serial converter for controlling the data supplied to a display device.
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Abstract
A circuit arrangement for the display of a cursor symbol of variable magnitude addresses the cursor memory by means of a separate addressing device which operates only during display of the cursor field. The organization of the memory for the cursor symbol, constructed as a matrix memory, is fully independent of the rows and columns of the cursor field, i.e. to the cursor symbol the memory appears as a pure linear memory. As a result, this memory can be utilized in a substantially improved manner and the display of even large cursor symbols requires only a limited storage capacity.
8 Citations
6 Claims
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1. A display device, comprising:
image generating means for generating an image in a raster scan format of pixels, said image generating means comprising cursor generating means for cursor generating and mixing means fed by said cursor generating means for mixing said cursor into said raster scan format for displaying, said cursor generating means comprising input means for receiving recurrent scanning control signals comprising a pixel clock signal, indicator means for indicating the position of a cursor field in the image, clip means fed by said input means and by said indicator means for generating a binary cursor window signal, a cursor memory having a plurality of locations each for storing a data word, all stored data words indicating at least one cursor pattern, addressing means fed by said input means and by said clip means for under control of a first value of said binary cursor window signal accessing successive locations for outputting data words, thereby advancing to each next location after a number of pixel clock signals which corresponds to the number of bits of each data word divided by a first number of bits used for the display of each cursor pixel, parallel-serial converter means for receiving each data word output by said memory and for supplying the first number of different consecutive bits of the received data word at each pixel clock signal which occurs during the first value of said binary cursor window signal, switch means controlled by said binary cursor window signal and fed by the parallel-serial converter for controlling the data supplied to a display device.
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2. A circuit arrangement for controlling a cursor display in a raster scan image, said arrangement comprising:
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input means for receiving recurrent scanning control signals comprising a pixel clock signal, indicator means for indicating the position of a cursor field in the image, clip means fed by said input means and by said indicator means for generating a bivalent cursor window signal, a cursor memory having a plurality of locations each for storing a data word, all stored data words indicating at least one cursor pattern, addressing means fed by said input means and by said clip means for under control of a first value of said binary cursor window signal accessing successive locations for outputting data words, thereby advancing to each next location after a number of pixel clock signals which corresponds to the number of bits of each data word divided by a first number of bits used for the display of each cursor pixel, parallel-serial converter means for receiving each data word output by said memory and for supplying the first number of different consecutive bits of the received data word at each pixel clock signal which occurs during the first value of said binary cursor window signal, switch means controlled by said clipping signal and fed by the parallel-serial converter for controlling the data supplied to a display device. - View Dependent Claims (3, 4, 5, 6)
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Specification