Xerox Corporation

Malcolm J Thompson

Hsing C Tuan

William D Turner

Richard H Bruce

Russel A Martin

Alan G Lewis

Michael G Hack

Louis D Silverstein

Thomas G Fiske

Hugo L Steemers

Jackson H Ho

Ronald T Fulks

William W Yao

John Seely Brown

Maurice F Holmes

Tzu-Chin Chuang

Victor M DaCosta

Robert R Allen, Deceased

Susan M Stuber

Robert J Nemanich

Kathryn M Middo

A display has sufficient resolution to present images as they would appear on other types of image output devices, such as types of printers or displays. In response to a user signal indicating a type of image output devices, data defining an image is used to automatically obtain version data defining a version of the image. The version can be presented on the display to show the image as it would appear when presented by an image output device of the indicated type. The user can indicate a type by selecting a menu item or a button or by providing a sequence of keystrokes. In response to a user signal indicating a parameter value, a version can be presented showing the image as it would appear when presented with the value. When a satisfactory image is displayed, the user can then request presentation of the image by a device of the indicated type. Either data defining the input image from which the displayed image is a version or data defining the currently displayed image can then be transformed to obtain a presentation version for the image output device. A copier or printer that includes the display can use it to perform print previewing.

Presenting an image on a display as it would be presented by another

An array of light control units has an area large enough to present images for direct viewing. The array also has light control units sufficiently dense that ordinary acuity artifacts are not noticeable in presented images when the array is directly viewed at usual viewing distances by a human with normal vision. Signal circuitry can provide signals to the light control units. The array can present an image that includes M colors, where M is more than three, even though each light control unit can only cause presentation of one of a segment with one of a set of N colors, where N is less than M. Data defining an input image with M colors are used to obtain data defining an output image that is a version of the input image but includes, for each light control unit, a color data item indicating one of its set of N colors. The signal circuitry provides signals to the light control units so that each light control unit presents a segment with the color indicated by its color data item. As a result, the array presents the output image so that its appearance to a human with normal vision viewing the array at usual viewing distances is substantially identical to the appearance the input image would have if presented.

Universal display that presents all image types with high image fidelity

The present invention is a digital imaging system for a copier that comprises a full-frame, two-dimensional sensor array to capture a document's image and a full-frame output light valve with backlight to flash expose the image onto a photoreceptor belt. The document is flash exposed to illuminate the page and the full-page image is captured by the full-frame, two dimensional sensor array. The sensor array then reads out the digital image data in response to a driver. The data is then input into the full-frame digital output light valve. The driver provides for the synchronous control of the system. Optionally, an electronic subsystem may perform digital image processing according to user demand--before the data arrives at the output light valve. After image processing (if any), the digital data, supplied to the full-page output light valve, forms a pattern on the display according to the data. The patterned image is then flash exposed by a backlight, through the light valve, and onto a photoreceptor.

Digital imaging system using two-dimensional input sensor array and

A thin-film structure on an insulating substrate includes an array of binary control units with an area of at least 90 cm.sup.2 and a density of at least 60 binary control units per cm. One implementation has an area of approximately 510 cm.sup.2, a diagonal of approximately 33 cm, and a total of approximately 6.3 million binary control units. Each binary control unit has a lead for receiving a unit drive signal, to which it responds by causing presentation of a segment of images presented by the array. Each binary control unit can present a segment with either a first color having a maximum intensity or a second color having a minimum intensity. Each binary control unit's unit drive signal causes the binary control unit to present its first and second colors. The substrate can be glass. Each binary control unit can include an amorphous silicon thin-film transistor (TFT) and a storage capacitor. Each binary control unit can be square. The thin-film structure can be used in an active matrix liquid crystal display (AMLCD), monochrome or, with an appropriate filter, color.

Thin-film structure with dense array of binary control units for

A method of utilizing a thin film device as a photosensor. The thin film device comprises a substrate upon which is deposited a charge transport layer, first and second injecting electrodes in low electrical resistance contact with the charge transport layer, the injecting electrodes being laterally spaced from one another, a gate electrode spaced normally from the first and second injecting electrodes and located opposite the first injecting electrode, for controlling injection therefrom, and laterally offset from the second injecting electrode, and a gate dielectric layer separating the gate electrode from the first and second injecting electrodes and the charge transport layer. The method of utilization comprises applying a first electrical bias of a first magnitude to the first injecting electrode, applying a second electrical bias of a second magnitude to the second injecting electrode, inhibiting charge injection from the first injecting electrode by applying a third electrode bias to the gate electrode of a third magnitude, and illuminating the charge transport layer. The photosensor may be selectively operated in a unity gain mode or in a variable gain mode, wherein said unity gain mode is achieved by causing the second magnitude to be greater than the first magnitude and the variable gain mode is achieved by causing the second magnitude to be less than the first magnitude.

Method of using offset gated gap-cell thin film device as a photosensor

A thin film writing head for recording information upon a record medium by means of a continuous writing process. The writing head comprises thin film elements including marking elements, high and low voltage bus lines, driver circuitry, and switching elements, integrally fabricated upon a large area substrate. A latching circuit, including at least one of the switching elements is located between the pair of bus lines for connecting the marking elements directly to one of the bus lines, so as to insure that the marking elements are always connected to a source of reference potential.

Electrographic ion writing head driver system

A fluid jet assisted ion projection copier including a marking head incorporating an array of thin film ion modulating electrodes and photosensors integrated upon a single substrate. An optical projection system places incremental images of light and dark areas from an original to be copied onto the photosensor array. The marking head is mounted upon the ion projection housing, adjacent an outlet channel thereof for controlling the passage of ions out of the housing in accordance with the projected pattern of light and dark areas.

Ion projection copier

An electrographic writing head capable of placing continuous marks upon a record medium in response to the application of a high voltage to selected writing styluses. The writing head includes a substrate upon which stylus electrodes, multiplexed driver circuitry and active devices are integrally fabricated by thin film deposition techniques. For each stylus, there is provided a high voltage thin film transistor and a latching circuit for holding the state of the high voltage transistor for substantially an entire line writing time.

Electrographic writing head

A fluid jet assisted ion projection electrographic marking apparatus including a marking head having integrally fabricated thereon, an array of modulating electrodes, divided into sections, address bus lines, data bus lines and suitable thin film switches, for sequentially bringing the electrodes of a selected section to a predetermined voltage during a portion of the line scan time. The electrodes of non-selected sections in conjunction with the thin film switches, hold the predetermined voltage for controlling the passage of ions, exiting the apparatus, during the remainder of the line scan time.

Marking head for fluid jet assisted ion projection imaging systems

A method of forming an ohmic contact between an amorphous silicon hydride semiconductor and a substrate which includes coating a film of palladium on the substrate and overcoating the palladium with a thin film of amorphous silicon hydride forming a thin palladium silicide layer. The amorphous silicon hydride is dehydrogenated by annealing forming a highly defective amorphous silicon layer and a thicker palladium silicide layer through which carriers can readily tunnel. The amorphous silicon hydride semiconductor is then coated over the amorphous silicon layer to the desired thickness.

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Palo Alto, CA, United States of America

Malcolm J Thompson