Browse Prior Art Database

ELECTRONIC DRIVE SYSTEM FOR DIRECT ELECTROSTATIC PRINTING (dep) AND SIMILAR SYSTEMS

IP.com Disclosure Number: IPCOM000026922D
Original Publication Date: 1994-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 8 page(s) / 426K

Publishing Venue

Xerox Disclosure Journal

Abstract

Electronic printing systems are now required to have the capability of producing a grayscale for each picture element or pixel. From an electronic hardware standpoint, it is desirable to minimize the number of pixel drivers in order to reduce circuit costs. The number of pixel drivers can be reduced by simplifying the complexity of each individual driver and by increasing packaging density of the integrated circuits comprising a number of independent driver circuits.

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Page 1 of 8

XEROX DISCLOSURE JOURNAL

ELECTRONIC DRIVE SYSTEM FOR

DIRECT ELECTROSTATIC U.S. C1.346/154 PRINTING (DEP) AND SIMILAR
SYSTEMS
Joseph F. Stephany
Fred
W. Schmidlin
David
D. Hoesly
Michael Poleshuk

Proposed Classification

Int. C1. Gold 15/06

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XEROX DISCLOSURE JOURNAL - Vol. 19, No. 3 May/June 1994 217

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ELECTRONIC DRIVE SYSTEM FOR DIRECT ELECTROSTATIC PRINTING (DEP) AND SIMILAR SYSTEMS(Cont'd)

218 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 3 May/June 1994

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Page 3 of 8

ELECTRONIC DRIVE SYSTEM FOR DIRECT ELECTROSTATIC PRINTING (DEP) AND SIMILAR SYSTEMS(Cont'd)

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XEROX DISCLOSURE JOURNAL - Vol. 19, No. 3 May/June 1994 219

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Page 4 of 8

ELECTRONIC DRIVE SYSTEM FOR DIRECT ELECTROSTATIC PRINTING (DEP) AND SIMILAR SYSTEMS(Cont'd)

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220 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 3 May/June 1994

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Page 5 of 8

ELECTRONIC DRIVE SYSTEM FOR DIRECT ELECTROSTATIC PRINTING (DEP) AND SIMILAR SYSTEMS(Cont'd)

Electronic printing systems are now required to have the capability of producing a grayscale for each picture element or pixel. From an electronic hardware standpoint, it is desirable to minimize the number of pixel drivers in order to reduce circuit costs. The number of pixel drivers can be reduced by simplifying the complexity of each individual driver and by increasing packaging density of the integrated circuits comprising a number of independent driver circuits.

Active pull-up semiconductors such as, for example, open-collector bipolar transistors, or open-drain unipolar transistors that are fabricated in integrated circuits, occupy the smallest volume of packaging density by reason of efficient use of space. If active pull-up transistors are used, the packaging density of the integrated circuit driver chip is immediately halved since only two high-voltage transistors are required per pixel. Thus, the electronic drive system for direct electrostatic printing (DEP) proposed herein, will reduce the number of drivers by a factor of two and thereby halve the cost of the corresponding driver chips.

As applied to a grayscale, this means that the best technique for grayscale generation is one that modulates each individual pixel with a proportionate amount of information about the grayscale. One commonly used technique sacrifices pixel resolution for grayscale by employing more than one pixel, and consequently extra drivers to generate a single pixel in the final print. By establishing the principle that each pixel be indiv...