EP1054747A1 - Visuel a diodes electroluminescentes a couleurs organiques et procede de fabrication - Google Patents

Visuel a diodes electroluminescentes a couleurs organiques et procede de fabrication

Info

Publication number
EP1054747A1
EP1054747A1 EP99969362A EP99969362A EP1054747A1 EP 1054747 A1 EP1054747 A1 EP 1054747A1 EP 99969362 A EP99969362 A EP 99969362A EP 99969362 A EP99969362 A EP 99969362A EP 1054747 A1 EP1054747 A1 EP 1054747A1
Authority
EP
European Patent Office
Prior art keywords
display device
color
substrate
organic light
color changing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99969362A
Other languages
German (de)
English (en)
Inventor
Amalkumar P. Ghosh
Olivier F. Prache
Munisamy Anandan
Webster E. Howard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Emagin Corp
Original Assignee
FED Corp USA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FED Corp USA filed Critical FED Corp USA
Publication of EP1054747A1 publication Critical patent/EP1054747A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/874—Passivation; Containers; Encapsulations including getter material or desiccant

Definitions

  • the present invention relates to color organic light-emitting diode (OLED) video displays.
  • OLED organic light-emitting diode
  • the present invention is directed to a color OLED display provided with a hydrophobic, transparent passivation layer disposed on the OLED layers and substrate.
  • OLEDs Organic light-emitting diodes
  • OLEDs have been known for approximately two decades. All OLEDs work on the same general principles.
  • One or more layers of semiconducting organic material are sandwiched between two electrodes.
  • An electric current is applied to the device, causing negatively charged electrons to move into the organic material(s) from the cathode.
  • Positive charges typically referred to as holes, move in from the anode.
  • the positive and negative charges meet in the center layers (i.e., the semiconducting organic material), combine, and produce photons.
  • the wave-length ⁇ and consequently the color ⁇ of the photons depends on the electronic properties of the organic material in which the photons are generated.
  • one of the electrodes is transparent.
  • the cathode may be constructed of a low work function material.
  • the holes may be injected from a high work function anode material into the organic material.
  • the devices operate with a DC bias of from 2 to 30 volts.
  • the films may be formed by evaporation, spin casting or other appropriate polymer film- forming techniques, or chemical self-assembly. Thicknesses typically range from a few mono layers to about 1 to 2,000 Angstroms.
  • OLEDs typically work best when operated in a current mode. The light output is much more stable for constant current drive than for a constant voltage drive. This is in contrast to many other display technologies, which are typically operated in a voltage mode.
  • An active matrix display using OLED technology therefore, requires a specific pixel architecture to provide for a current mode of operation.
  • OLEDs are formed on a single substrate and arranged in groups in a regular grid pattern.
  • OLED groups forming a column of the grid may share a common cathode, or cathode line.
  • OLED groups forming a row of the grid may share a common anode, or anode line.
  • the individual OLEDs in a given group emit light when their cathode line and anode line are activated at the same time.
  • An OLED may be designed to be viewed either from the "top” — the face opposite the foundational substrate — or from the "bottom", i.e., through the substrate, from the face opposite the light-emitting layer. Whether the OLED is designed to emit light through the top or the bottom, the respective structure between the viewer and the light-emitting material needs to be sufficiently transparent, or at least semi-transparent, to the emitted light. In many applications it is advantageous to employ an OLED display having topside light output. This permits the display to be built on top of a silicon driver chip for active matrix addressing.
  • the color of light emitted from the OLED can be controlled by the selection of the organic material.
  • White light is produced by generating blue, red and green lights simultaneously.
  • the precise color of light emitted by a particular structure can be controlled both by selection of the organic material as well as by selection of impurities, or dopants, added to the organic materials.
  • impurities, or dopants added to the organic materials.
  • the color of light emitted from an OLED may be affected not only by the source material and/or doping of the light-emitting layer, but also by color filters, color converters or color changing films that are formed above the OLED pads or light-emitting layers.
  • OLEDs have a number of beneficial characteristics. These include a low activation voltage (about 5 volts), fast response when formed with a thin light-emitting layer, and high brightness in proportion to the injected electric current. OLEDs are currently the subject of aggressive investigative efforts. Although substantial progress has been made in the development of OLEDs to date, additional challenges remain. For example, fabrication of color OLED displays generally requires side-by-side patterning of red, green and blue sub-pixels. Since these devices are extremely moisture sensitive, any kind of wet processing is normally not possible. Moreover, suitable red, blue and green color emitter materials, with good color gamut and lifetime, have not yet been realized. Because of these limitations in emitter materials, most color OLED displays are fabricated using either color filters or color changing media (CCM).
  • CCM color changing media
  • the color filter or CCM pattern can be fabricated on the same substrate as the OLED, prior to the deposition of the OLED layers.
  • the silicon substrate is non-transparent and integrates all drivers, this is not possible.
  • the OLED layers are deposited on the silicon substrate and the color filter or CCM layers are patterned separately on a different transparent substrate. The two substrates are hermetically sealed together after accurate alignment.
  • Figure 1 shows a typical arrangement.
  • OLED layers passivated by a transparent layer.
  • the color organic light- emitting display device may comprise: a substrate; a plurality of organic light-emitting diode drivers for emitting light, arranged in a matrix and integrated into the substrate; means for passivating the organic light-emitting diode drivers, formed in contact with the substrate and the organic light-emitting diode drivers; means for changing the color of the light emitted from the organic light-emitting diode drivers, formed in contact with passivation means; and a cover for protecting the organic light-emitting diode drivers, the passivation means, and the color changing means, hermetically sealed to the substrate.
  • the substrate may be a silicon wafer.
  • the passivation means may be a passivation layer.
  • the passivation layer may be a transparent and hydrophobic material.
  • the material for the passivation layer may be selected from the group of silicon dioxide, silicon carbide and silicon nitride.
  • the material for the passivation layer may be a transparent organic material that does not retain moisture, wherein the transparent organic material is a fiuoropolymer.
  • the passivation means may be a getter layer formed in contact with the substrate and the organic light-emitting diode drivers and a passivation layer formed in contact with the getter layer.
  • the getter layer is transparent and may be MgO.
  • the present invention is directed to a color display device wherein the color changing means may comprise color filters or color changing media.
  • the color changing means may be patterned on the passivation means using the alignment marks on the substrate and may be patterned using wet processing methods.
  • the cover may be aligned to the substrate without stringent alignment tolerances.
  • the present invention is also directed to a color display device wherein the display device is capable of providing a resolution of 1280 x 1024 lines, is suitable for a head wearable display, and is less than 1 inch in diagonal.
  • the present invention is also directed to a method for fabricating a color organic light- emitting display device, comprising the steps of: fabricating a substrate; forming organic light- emitting diode drivers in a matrix array in contact with the substrate; forming a passivation means in contact with the substrate and the organic light-emitting diode drivers; patterning color changing means lithographically on the passivation means, wherein the color changing means comprises at least one of (a) color filters, and (b) color changing media; fabricating a glass cover for protecting the organic light-emitting diode drivers and color changing media; and sealing the glass cover hermetically to the substrate.
  • the step of patterning the color changing means may use alignment marks on the substrate for aligning the color changing means with the organic light-emitting diode drivers and may use wet processing methods.
  • the method for fabricating a color organic light-emitting display device provides a top- emitting color organic light-emitting display device that permits both the organic light-emitting diode drivers and the color changing media patterns to be fabricated on the substrate.
  • the passivation means formed by the disclosed method may be a passivation layer.
  • the passivation means may be a getter layer formed in contact with the substrate and the organic light-emitting diode drivers, and a passivation layer formed in contact with the getter layer.
  • Fig. 1 depicts a perspective view of aprior art color organic light-emitting display device
  • Fig. 2 depicts a perspective view of a color organic light-emitting display device according to an embodiment of the present invention having a passivation layer deposited between the silicon substrate and the glass cover
  • Fig. 3 depicts a side view of a color organic light-emitting display device according to an alternative embodiment of the present invention having a getter layer deposited between the silicon substrate and the passivation layer.
  • the known OLED display device 10 comprises a silicon substrate with integrated drivers 100. Glass cover 120 is disposed on substrate 100, and is hermetically sealed to silicon substrate 100 using seal band 110. Color filter or color changing media (CCM) pattern 130 is applied to top surface of glass cover 120.
  • the known display device 10 of Fig. 1 operates as follows: upon application of the appropriate voltage to an anode and cathode line (not shown), electrodes (not shown) in the OLED layers, connected to the anode and cathode, emit light.
  • the emitted light may be of a particular color, or may be white, depending on the organic material and/or doping of the OLED layer (not shown).
  • the color of the emitted light is changed upon passing through color filter or color changing media 130. This colored light passes through glass cover 120 providing the visual display from device 10.
  • FIG. 2 An embodiment of a color organic light-emitting device for video displays according to the present invention is shown as 20 in Fig. 2.
  • This embodiment of a color OLED display device comprises substrate 200, with OLED drivers (not shown) integrated therein.
  • Substrate 200 preferably is silicon.
  • passivation layer 210 is disposed on substrate 200.
  • Passivation layer 210 may be silicon dioxide, silicon carbide, silicon nitride, or other transparent material. Passivation layer 210 may also be formed from transparent organic materials that do not retain moisture, such as fluoropolymers.
  • color filter or color changing media (CCM) patterns 230 may be lithographically fabricated directly on passivation layer 210. Color patterns 230 may be patterned using the alignment marks on substrate 200 itself, using wet precessing methods.
  • Device 20 may then be hermetically sealed using a simple glass cover 220, requiring no stringent alignment tolerances.
  • Device 20 may be fabricated for head wearable application and may be a maximum of 1 inch in width by 1 inch in length.
  • Substrate 200 and glass cover 220 may both be 0.7 mm thick.
  • This embodiment of the present invention operates as follows: upon application of the appropriate voltage to an anode and cathode line (not shown), electrodes in the OLED layers (not shown), connected to the anode and cathode, emit light. The color of the emitted light is changed upon passing through color filter or color changing media 230. This colored light passes through glass cover 220 providing the visual display from device 20.
  • FIG. 3 An alternate embodiment 30 is shown in Fig. 3.
  • transparent getter layer 240 is formed over the OLED layer stack 205 prior to depositing passivation layer 210.
  • Getter layer 240 may be composed of MgO. MgO is an excellent getter material and may prevent any moisture permeation into the OLED layers that might occur during the processing of color filter or CCM patterns 230.
  • passivation layer 210 is deposited on getter layer 240.
  • color filter or CCM patterns may be lithographically fabricated directly on passivation layer 210, using alignment marks on substrate 200, by wet processing methods.
  • device 30 may then be hermetically sealed using a simple glass cover (not shown), requiring no stringent alignment methods.

Landscapes

  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un visuel à diodes électroluminescentes, qui comprend: un substrat au silicium (200), avec une pluralité de commandes de diodes intégrées (205) disposées en matrice; une couche de passivation hydrophobe transparente (210); un filtre coloré ou un support de changement de couleur (230) établi sur la couche de passivation (210); et un couvercle de verre (220) protégeant les commandes susmentionnées (205), la couche de passivation (210), et le filtre coloré ou le support de changement de couleur (230). La couche de passivation (210) permet d'établir la configuration du filtre coloré ou du support de changement de couleur (230) en utilisant des procédés de traitement humide. Selon une variante, une couche getter (240) est ensuite formée sur le substrat (200) et les commandes de diodes (205). La couche de passivation (210) est ensuite formée sur la couche getter (240). L'invention concerne en outre un procédé relatif à la fabrication d'un visuel à diodes électroluminescentes comprenant une couche de passivation (210) et un support de changement de couleur (230).
EP99969362A 1998-09-22 1999-09-22 Visuel a diodes electroluminescentes a couleurs organiques et procede de fabrication Withdrawn EP1054747A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10142898P 1998-09-22 1998-09-22
US101428P 1998-09-22
PCT/US1999/021936 WO2000016938A1 (fr) 1998-09-22 1999-09-22 Visuel a diodes electroluminescentes a couleurs organiques et procede de fabrication

Publications (1)

Publication Number Publication Date
EP1054747A1 true EP1054747A1 (fr) 2000-11-29

Family

ID=22284599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99969362A Withdrawn EP1054747A1 (fr) 1998-09-22 1999-09-22 Visuel a diodes electroluminescentes a couleurs organiques et procede de fabrication

Country Status (2)

Country Link
EP (1) EP1054747A1 (fr)
WO (1) WO2000016938A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY141175A (en) * 2000-09-08 2010-03-31 Semiconductor Energy Lab Light emitting device, method of manufacturing the same, and thin film forming apparatus
US6624839B2 (en) * 2000-12-20 2003-09-23 Polaroid Corporation Integral organic light emitting diode printhead utilizing color filters
US6888307B2 (en) * 2001-08-21 2005-05-03 Universal Display Corporation Patterned oxygen and moisture absorber for organic optoelectronic device structures
EP1553807A4 (fr) * 2002-10-16 2008-05-14 Idemitsu Kosan Co Dispositif electroluminescent organique et procede de fabrication associe
DE10312679B4 (de) * 2003-03-21 2006-08-31 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Ändern einer Umwandlungseigenschaft einer Spektrumsumwandlungsschicht für ein lichtemittierendes Bauelement
DE102007046018A1 (de) 2007-09-26 2009-04-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Organisches elektronisches Bauelement mit trockenmittelhaltigem Passivierungsmaterial
TWI681559B (zh) 2013-10-10 2020-01-01 日商精工愛普生股份有限公司 發光裝置及包含其之電子機器
CN104282728B (zh) * 2014-10-10 2017-03-15 深圳市华星光电技术有限公司 一种白光oled显示器及其封装方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5641611A (en) * 1995-08-21 1997-06-24 Motorola Method of fabricating organic LED matrices
US5686360A (en) * 1995-11-30 1997-11-11 Motorola Passivation of organic devices
US5731661A (en) * 1996-07-15 1998-03-24 Motorola, Inc. Passivation of electroluminescent organic devices

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0016938A1 *

Also Published As

Publication number Publication date
WO2000016938A1 (fr) 2000-03-30

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