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Browse Prior Art Database

Display Resolution Improvement

IP.com Disclosure Number: IPCOM000043330D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Dyche, MP: AUTHOR [+2]

Abstract

The display of low resolution data or graphics on a high resolution display monitor is disclosed. An IBM Personal Computer (PC) provides 200 lines of non-interlaced video which is displayed on an IBM 3279 display designed to display an interlaced picture of 384 lines (Model 3). The vertical sync from the PC is delayed by half a line time on alternate fields to give an interlaced display of improved legibility. When a low resolution raster image is scanned in a non-interlaced mode on a high resolution display, the line structure becomes excessively visible, and the picture quality is unacceptable. Here, 200 lines of video from the IBM PC are scanned onto the 3279 CRT when in PC display mode. The 3279 tube has high resolution and good focus and convergence. It was designed to display a picture of 384 scan lines (Model 3).

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Display Resolution Improvement

The display of low resolution data or graphics on a high resolution display monitor is disclosed. An IBM Personal Computer (PC) provides 200 lines of non- interlaced video which is displayed on an IBM 3279 display designed to display an interlaced picture of 384 lines (Model 3). The vertical sync from the PC is delayed by half a line time on alternate fields to give an interlaced display of improved legibility. When a low resolution raster image is scanned in a non- interlaced mode on a high resolution display, the line structure becomes excessively visible, and the picture quality is unacceptable. Here, 200 lines of video from the IBM PC are scanned onto the 3279 CRT when in PC display mode. The 3279 tube has high resolution and good focus and convergence. It was designed to display a picture of 384 scan lines (Model 3). A 2:1 interlace is introduced to the picture which was at source non-interlaced. This effectively broadens the scanned lines, so that the line structure is made less visible, and the image more legible. By using this technique, a high resolution monitor may be used to display data/graphics from two sources, one with a larger number of scan lines and one with a smaller number. The monitor may be designed for the larger number of scan lines, while still displaying the smaller number adequately. This is the case when a PC is attached to a 3279, where the original picture of 384 lines is from the 3279 logic (e.g., cont...