Browse Prior Art Database

Gas Panel Driver Selection Matrix

IP.com Disclosure Number: IPCOM000088884D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 3 page(s) / 69K

Publishing Venue

IBM

Related People

Price, CA: AUTHOR

Abstract

One of the problems associated with gas panels relates to the drive system, since, conventionally, one driver per line is utilized in both directions. In large panels, this is a particularly severe problem in integrated circuitry where high packaging density is required. A system adapted to drive a single row of characters, utilizing 9 x 16 character matrices and substituting diodes for transistors to permit high density packaging, operates as follows.

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Gas Panel Driver Selection Matrix

One of the problems associated with gas panels relates to the drive system, since, conventionally, one driver per line is utilized in both directions. In large panels, this is a particularly severe problem in integrated circuitry where high packaging density is required. A system adapted to drive a single row of characters, utilizing 9 x 16 character matrices and substituting diodes for transistors to permit high density packaging, operates as follows.

Referring to the drawing, a 5-bit code identified as Data 1-5 is connected such that a 2-out-of-5 data input code can uniquely select one pair of consecutive outputs, i.e., 1, 2; 3, 4; etc. In the write operation employed in the illustrated embodiment, characters are written in a horizontal line or slice mode in which a bit pattern is utilized to condition the associated vertical drivers for the entire line, a drive pulse is applied to the selected horizontal line whereby those cells defined by the coordinate intersection of the vertical and horizontal lines are selectively fired. Using a 9 x 16 character matrix, 16 horizontal slices are required to generate a row of characters.

Since the drive circuitry is packaged on chips, the selected diodes are further conditioned by a chip select signal on line 20 when a multiple line display is utilized. Horizontal sustain voltage signals -V(s) and +V(s) are provided from terminals 27 and 29, respectively, through associated sustain diode matrices, four diodes being utilized to service a pair of consecutive lines. For example, diodes 31, 32, 33 and 34 are connected to lines 1 and 2, with diodes 31 and 33 receiving a negative potential from terminal 27 and diodes 32 and 34 receiving a positive sustain signal from terminal 29. The horizontal sustain may be a duplicate of the vertical, or may be referenced to ground or a...