Raster-scan display apparatus for computer-generated images
First Claim
1. In a digitalized visual display system employing a display device having a screen whose area is scanned by a plurality of displaced scanning lines, with each line traversing a number of elemental areas on the screen, and wherein a data signal to be displayed is periodically sampled, and a quantised signal is produced for each data sample and applied to the display device to incrementally create a visual image, the improvement comprising means for improving the resolution of the visual image:
- said resolution improving means including means for producing a time displaced series of additional samples of the data signal during the time interval that the scanning beam traverses each elemental area on the screen, means for quantising each of samples to begin and to terminate at a different time than the other quantised samples, and combining means for applying said combined plural quantised samples to the display device for each elemental area, thereby to provide a combined quantised signal that more nearly approximates a corresponding analog variation of the data signal for each elemental area.
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Abstract
A raster-scan display system for computer-generated images in which each raster line is quantized into a number (N) of sets of image elements each successive set being displaced in time, with respect to the line start, by 1/N of the duration of one element. The corresponding video signals are summed for each line and the resultant signal is displayed. The technique provides a visual image with graded intensity changes more nearly simulating a television type image, instead of a stepwise changing image. In one form of the invention, a triangular hold technique is used, that is, the display is delayed to permit of a linearly changing intensity charge between consecutive elements of different intensity.
42 Citations
6 Claims
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1. In a digitalized visual display system employing a display device having a screen whose area is scanned by a plurality of displaced scanning lines, with each line traversing a number of elemental areas on the screen, and wherein a data signal to be displayed is periodically sampled, and a quantised signal is produced for each data sample and applied to the display device to incrementally create a visual image, the improvement comprising means for improving the resolution of the visual image:
said resolution improving means including means for producing a time displaced series of additional samples of the data signal during the time interval that the scanning beam traverses each elemental area on the screen, means for quantising each of samples to begin and to terminate at a different time than the other quantised samples, and combining means for applying said combined plural quantised samples to the display device for each elemental area, thereby to provide a combined quantised signal that more nearly approximates a corresponding analog variation of the data signal for each elemental area. - View Dependent Claims (2, 3, 4, 5, 6)
Specification