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This article describes a method to improve the legibility of complex ideographic characters on a high resolution CRT. (Image Omitted)
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
64% of the total text.
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Improved Legibility of CRT Characters
This article describes a method to improve the legibility of complex
ideographic characters on a high resolution CRT.
When displaying ideographic characters on a high resolution CRT, legibility
becomes a problem with characters having a high number of brush strokes.
Switching characteristics of the CRT, along with the aspect ratio of the character,
tends to favor the horizontal lines within the character. Characters with high
horizontal line content, along with resulting increased intensity, will bleed out
single pels within the character.
This article describes a method to balance the intensity between the
horizontal and vertical content within each character.
In Fig. 1, the output portion of a video data stream is shown. Video data from
a video shift register of N bits is fed to the data input of "D" flip-flop 1. A pel
clock, or video oscillator, is fed to the clock input of "D" flip-flop 1. Normally, the
flip-flop would then connect to driver 2. Driver 2 would then drive the video input
to the CRT.
The problem is solved by implementing a pulse width modulation form of
control on the video data line. In Fig. 1, AND circuit 3, "D" flip-flop 4 and delay
line 5 are added to the video output circuit, as shown. Timing chart 6 shows the
timing relationship for generating the modulated data. The algorithm is such that
when two consecutive video data bits are present, the video output is modulated
during the period...