Eastman-kodak Company

Global Oled Technology LLC

Giuseppe Farruggia

Yuan-Sheng Tyan

Thomas Richard Cushman

Fridrich Vazan

Tukaram K Hatwar

Joel D Shore

Bruno Primerano

George R Olin

Raymond A Kesel

Jeremy M Grace

Jin-Shan Wang

Steven A Van Slyke

Donald R Preuss

Ronald L Oyer

Joseph C Deaton

James A Barnard

Michael P Cunningham

Randall H Victora

Michael J Motala

Donald Robert Preuss

Raymond Allen Kesel

An electrohydrodynamic printing system includes a nozzle that dispenses a printing fluid and a substrate support. The nozzle includes a conductive portion. A voltage source applies a voltage differential between the conductive portion of the nozzle and the substrate support. A controller is configured to provide a burst mode waveform to the voltage source such that a drop of the printing fluid is caused to form from the conductive nozzle and travel toward the substrate support.

Burst mode electrohydrodynamic printing system

A liquid stream is caused to jet from a nozzle. A small or large drop waveform applied to a drop forming mechanism causes the liquid stream to break up into a small or large volume drop, respectively. The small drop waveform includes a pulse having a pulse energy E, and a period X, where X, and where fis the Rayleigh frequency of the liquid. The large drop waveform has a period X, where X=NX, with the large volume drop being N times the small volume drop. The large drop waveform includes a first pulse having a pulse energy E, where E&#x2267;Eand a second pulse occurring within a time period X, where X&#x2266;X, of an initial pulse of a subsequent small or large drop waveform, the second pulse including a pulse energy E, where E&#x3c;E.

Drop formation with reduced stimulation crosstalk

A liquid stream is caused to jet from a nozzle. A small or large drop waveform applied to a drop forming mechanism causes the liquid stream to break up into a small or large volume drop, respectively. The small drop waveform includes a pulse having a width w, and a period x, where x&#x2248;1/f, where fis the Rayleigh frequency of the liquid. The large drop waveform includes a period Nx, with the large volume drop being N times the small volume drop. The large drop waveform includes a first pulse having a pulse width w, where w&#x2267;w, and a second pulse occurring within a period of (f/f)x of an initial pulse of a subsequent small or large drop waveform, where fis the cut off frequency of the liquid. The second pulse includes a pulse width w, where w&#x3c;w.

An electroluminescent device including a transparent substrate, a securing layer, a light scattering layer, an electroluminescent unit including a transparent electrode layer, a light emitting element including at least one light emitting layer, and a reflecting electrode layer in that order, wherein the light scattering layer includes one monolayer of inorganic particles having an index of refraction larger than that of the light emitting layer and wherein the securing layer holds the inorganic particles in the light scattering layer.

Electroluminescent device having improved light output

An OLED device including a transparent substrate having a first surface and a second surface, a transparent electrode layer disposed over the first surface of the substrate, a short reduction layer disposed over the transparent electrode layer, an organic light-emitting element disposed over the short reduction layer and including at least one light-emitting layer and a charge injection layer disposed over the light emitting layer, a reflective electrode layer disposed over the charge injection layer and a light extraction enhancement structure disposed over the first or second surface of the substrate; wherein the short reduction layer is a transparent film having a through-thickness resistivity of 10to 10ohm-cm; wherein the reflective electrode layer includes Ag or Ag alloy containing more than 80% of Ag; and the total device size is larger than 10 times the substrate thickness.

A white light emitting OLED apparatus includes a microcavity OLED device and a light-integrating element, wherein the microcavity OLED device has a white light emitting organic EL element and the microcavity OLED device is configured to have angular-dependent narrow-band emission, and the light-integrating element integrates the angular-dependent narrow-band emission from different angles from the microcavity OLED device to form white light emission.

White-emitting microcavity OLED device

Various OLED display and device structures are disclosed which reduce shorting.

OLED device with short reduction

A microcavity OLED device including a substrate; a metallic bottom-electrode layer disposed over the substrate; a metallic top-electrode layer spaced from the metallic bottom-electrode layer; and an organic EL medium structure having a defined thickness, and including a light-emitting layer comprising a host material and at least one dopant disposed between the top-electrode layer and the bottom-electrode layer; wherein one of the metallic electrode layers is light transmissive and the other one is essentially opaque and reflective; wherein the material for reflective metallic electrode layer includes Ag, Au, Al, or alloys thereof, and the material for the light transmissive metallic electrode layer includes Ag, Au, or alloys thereof. The at least one dopant is selected to generate one of red, green, or blue light in the light-emitting layer. The defined thickness of the EL medium structure is selected so that the microcavity OLED device is tuned for emission of one of red, green, or blue light through the light transmissive electrode layer.

Microcavity OLED device

A stabilized OLED device for emitting light of a specific color includes a metallic anode and a metallic cathode spaced from the metallic anode. The device also includes a light-emitting layer including a host and a dopant, the dopant selected to produce light having a spectrum including light of the specific color, and a stabilizer provided in one of the device layers which improves the useful lifetime of the OLED device, wherein the stabilizer has an emission spectrum different from that of the light-emitting layer. One of the electrode layers is semitransparent and the other one is substantially opaque and reflective such that the stabilized OLED device forms a microcavity that emits a narrow band light with the specific color.

Stabilized OLED device

A color organic light-emitting display device having an array of pixels divided into at least two different color pixel sets each color pixel set emitting a different predetermined color light over a common substrate, wherein each pixel in the array includes a metallic bottom-electrode layer disposed over the substrate and a metallic electrode layer spaced from the metallic bottom-electrode layer; wherein the material for reflective metallic electrode layer includes Ag, Au, Al, or alloys thereof, the material for the semitransparent metallic electrode layer includes Ag, Au, or alloys thereof; and wherein the thickness of the semitransparent metallic electrode layer, the combined thickness of the organic layers and the transparent conductive phase-layer, and the placement of the light-emitting layer are selected so that each pixel in the display forms a tuned microcavity OLED device having an emission output efficiency above that of a comparable OLED device without the microcavity.

Tuned microcavity color OLED display

A method for transferring organic material from a flexible donor element onto a substrate to form a layer of organic material in making one or more OLED devices, includes providing the flexible donor element and the substrate in a spaced relationship within a chamber under atmospheric pressure defined by a transfer station so that the flexible donor element partitions the chamber into first and second cavities; varying the pressure differential between the first and second cavities to cause the flexible donor element to move into a contact relationship with the substrate; providing a transparent window which defines the top surface of the second cavity; and providing radiation energy through the transparent window onto the flexible donor element in contact with the substrate to cause the flexible donor element to absorb heat and transfer organic material onto the substrate.

Method for transferring of organic material from a donor to form a layer in an OLED device

A WORM optical recording element comprising a substrate and a phase-change recording layer wherein the phase-change recording layer has a composition expressed by Sb X Sn Zn Si O S wherein X is an element selected from In, Ge, Al, Zn, Mn, Cd, Ga, Ti, Si, Te, Nb, Fe, Co, W, Mo, S, Ni, O, Se, Tl, As, P, Au, Pd, Pt, Hf,or V and a>0, b>0, c>0, d>0, e>0, f>0, h>0, and a &plus;b&plus;c&plus;d&plus;e&plus;f&plus;h&equals;100.

Phase-change recording element for write once applications

A WORM optical recording element comprising a substrate and a phase-change recording layer wherein the phase-change recording layer has a composition expressed by Sb In Sn Zn Si O S wherein a>0, b>0, c>0, d>0, e>0, f>0, h>0, and a&plus;b&plus;c&plus;d&plus;e&plus;f&plus;h&equals;100

A WORM optical recording element includes a substrate; an amorphous phase-change recording layer disposed over the substrate; a dielectric layer disposed adjacent to the amorphous phase-change layer; a reflector layer disposed adjacent to the dielectric layer; and wherein the material and the thickness of the layers are selected such that recording can be performed on the optical recording element by using a focused laser beam to form crystalline marks in the phase-change layer using laser pulses with less than 40 nS in duration, the reflectivity of the amorphous phase as measured by a collimated beam is higher than 28% and the contrast of the read-back signal is higher than 0.6, and the second and subsequent writing over previous recording results in at least a 50% increase in read out jitter.

Growing community of inventors

Webster, NY, United States of America

Giuseppe Farruggia