Eastman-kodak Company

Mark V Hettel

Edward C Gage

Steven C Dohmeier

Ronald S Cok

A digital image display device, having a substrate; a light emitting display formed on the substrate, the display having an array of light emitting pixels; a representative light emitting pixel formed on the substrate; a photosensor located on the display device and optically coupled to the representative light emitting pixel; and a feedback control circuit connected to the photosensor for modifying the light emitting display.

Emissive display with luminance feedback from a representative pixel

Apparatus for reading data from an optical medium having improved settling time characteristics and reduced bandwidth requirements is disclosed. The apparatus includes a front facet detector for producing a front facet monitor signal from a laser light beam; first and second detectors for producing first and second data signals, respectively; and a first gain control circuit responsive to the front facet monitor signal to produce a gain adjusted front facet monitor signal. The apparatus further includes a second gain control circuit responsive to the first data signal and the gain adjusted front facet monitor signal to produce a first gain adjusted data signal; a third gain control circuit responsive to the second data signal and the gain adjusted front facet monitor signal to produce a second gain adjusted data signal; circuitry responsive to the first and second gain adjusted data signals to produce a magneto-optic data signal as a function of the difference between the first and second gain adjusted data signals; or to produce a combined data signal as a function of the sum of the first and second gain adjusted data signals and responsive to the gain adjusted front facet monitor signal and the combined data signal to produce a write-once data signal as a function of the difference between the gain adjusted front facet monitor signal and the combined data signal.

Bandwidth reduction in writeable optical data storage apparatus

A method for reading data from an optical medium having improved settling time characteristics and reduced bandwidth requirements, including producing a gain adjusted front facet monitor signal from a laser light beam, producing first and second data signals from data read from the medium, and producing first and second gain adjusted data signals in response to the gain adjusted front facet monitor signal and first and second data signals, respectively. The method further includes producing a magneto-optic data signal in response to the first and second gain adjusted data signals, the magneto-optic data signal being a function of the difference between the first and second gain adjusted data signals; or producing a combined data signal in response to the first and second gain adjusted data signals, the combined data signal being a function of the sum of the first and second gain adjusted data signals, and producing a write-once data signal in response to the gain adjusted front facet monitor signal and the combined data signal, the write-once data signal being a function of the difference between the gain adjusted front facet monitor signal and the combined data signal.

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Penfield, NY, United States of America

Mark V Hettel