Browse Prior Art Database

Quasi 7 Segment Characters

IP.com Disclosure Number: IPCOM000089752D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Lamoureux, WR: AUTHOR

Abstract

In conventional matrix plasma display devices, characters are generated for display as a sequence of dots by selective energization of coordinate orthogonal conductors on opposite sides of the panel. However, one of the limitations in designing low cost numeric displays is that of driving, since the display requires one driver for each character line in a matrix such that a 5 x 7 dot matrix character would require 12 drivers. The horizontal drivers would be common for each of the characters to be displayed in a single line, while individual vertical drivers would be required for each line in each of the characters or five vertical drivers per character. A system for reducing the driver requirements for a low cost gas panel numeric only application is described below.

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Quasi 7 Segment Characters

In conventional matrix plasma display devices, characters are generated for display as a sequence of dots by selective energization of coordinate orthogonal conductors on opposite sides of the panel. However, one of the limitations in designing low cost numeric displays is that of driving, since the display requires one driver for each character line in a matrix such that a 5 x 7 dot matrix character would require 12 drivers. The horizontal drivers would be common for each of the characters to be displayed in a single line, while individual vertical drivers would be required for each line in each of the characters or five vertical drivers per character. A system for reducing the driver requirements for a low cost gas panel numeric only application is described below.

Referring to Fig. 1, a conventional 5 x 7 dot matrix is illustrated in which the seven horizontal lines are designated X(1) - X(7) and the five vertical lines Y(1) - Y(5). In the low cost application, the numeric character font can be modified by combining some of the dots into line segments which will be addressed by a common driver. As shown in Fig. 2, dots 8, 9 and 10 are combined on horizontal line H(1), as are cells 11, 12, 13 and 17, 18, 19 on lines H(3)and H(5), respectively. A common drive line V(2) drives the vertical Y(2), Y(3) and Y(4). In the horizontal direction, cells 21, 22 and 23, 24, on commoned horizontal lines X(2), X(3) are driven by common driver H(2)....