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Browse Prior Art Database

Single Element Boost in Digital Display

IP.com Disclosure Number: IPCOM000088330D
Original Publication Date: 1977-May-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Rowe, HL: AUTHOR

Abstract

In a raster-scanned cathode-ray tube display, single picture elements are less bright than multiple picture elements because of finite rise-times and bandwidth in the tube and associated circuitry. Thus the vertical strokes of a letter are less bright than the horizontal strokes. To overcome this problem, single picture elements are detected by logic and assigned increased brightness.

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Single Element Boost in Digital Display

In a raster-scanned cathode-ray tube display, single picture elements are less bright than multiple picture elements because of finite rise-times and bandwidth in the tube and associated circuitry. Thus the vertical strokes of a letter are less bright than the horizontal strokes. To overcome this problem, single picture elements are detected by logic and assigned increased brightness.

As shown in the block diagram, the serial video data stream of a scanned line is fed to a three-bit shift register and shifted at the data rate by a clock signal. The three consecutive bits n-1, n and n + 1 in the shift register are applied to logic gates which separate the data stream into single elements on line S and multiple elements on line M. A single element is recognized when bit n is a "1" while bits n - 1 and n + 1 are both "0".

Lines S and M are each connected to a variable driver circuit which produce voltages VS and VM, respectively, which are combined to form a video signal for the display. The driver circuits are adjusted to provide equal brilliance for single and multiple picture elements.

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