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WO1999030304A2 - Dispositif luminescent et procede associe - Google Patents

Dispositif luminescent et procede associe Download PDF

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Publication number
WO1999030304A2
WO1999030304A2 PCT/US1998/026111 US9826111W WO9930304A2 WO 1999030304 A2 WO1999030304 A2 WO 1999030304A2 US 9826111 W US9826111 W US 9826111W WO 9930304 A2 WO9930304 A2 WO 9930304A2
Authority
WO
WIPO (PCT)
Prior art keywords
conductors
display device
conductor
electroluminescent display
phosphor
Prior art date
Application number
PCT/US1998/026111
Other languages
English (en)
Other versions
WO1999030304A3 (fr
Inventor
Francis Peterson
David Walsh
Original Assignee
Phillips Plastics Corporation
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 Phillips Plastics Corporation filed Critical Phillips Plastics Corporation
Priority to EP98960830A priority Critical patent/EP1042745A4/fr
Priority to CA002313468A priority patent/CA2313468A1/fr
Priority to AU16334/99A priority patent/AU1633499A/en
Priority to JP2000524781A priority patent/JP2001526444A/ja
Publication of WO1999030304A2 publication Critical patent/WO1999030304A2/fr
Publication of WO1999030304A3 publication Critical patent/WO1999030304A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/26—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources

Definitions

  • the present invention relates to electronically-controlled displays that can be manufactured as parts of other functional structures. More particularly, the present invention relates to electronic displays, including electroluminescent displays, that can be manufactured as parts of other functional structures.
  • Displays are implemented using a variety of technology areas for use in a wide variety of applications.
  • the technology areas span from the cathode ray tube (CRT), to various field emission display technologies, to light-emitting diode technologies, etc.
  • CTR cathode ray tube
  • the uses and applications of displays are without limit. For example, consider some display devices, such as with alphanumeric displays and computer-type display screens, whose primary purpose is to display information, and other display devices that serve secondary functions, such as backlighting user access points or controls. For many of these applications, the size and manufacturability of the display devices are major concerns.
  • electroluminescence is one of several popular display technologies that have been used in view of size constraints. Common uses of electroluminescence include, among other uses, backlighting watches and display screens in certain laptop and notebook computers. Electroluminescence technology is conventionally implemented using phosphor material sandwiched between two conductive layers. One of the conductive layers is typically a transparent material, such as mylar, that is coated with a transparent conductor, such as indium tin oxide. When a high voltage of alternating polarity is applied to the respective conductive layers, an electric field is created that excites the phosphor.
  • At least a three-layer electroluminescent display structure is cooperatively arranged nearby another circuit.
  • This neighboring circuit is arranged to avoid blocking the electroluminescent light
  • the electroluminescent display structure is arranged to avoid interfering with the functionality of the neighboring circuit.
  • this cooperative arrangement is not practicable.
  • the display device includes first and second conductive buses adjacent to an electroluminescent medium on a dielectric carrier.
  • the first and second conductive buses have at least one first conductor and at least one second conductor, respectively. These conductors are arranged in close proximity to one another, and they are secured over and supported by the dielectric carrier.
  • the electroluminescent medium is located proximate to the first and second conductors to permit an electric field set up by a voltage applied between the first and second conductors to generate light.
  • the medium is phosphor- based and polymer-based, respectively.
  • the method provides the manufacture of a electroluminescent display device on a dielectric carrier.
  • the method includes: applying a first conductive bus having at least one first conductor, and a second conductive bus having at least one second conductor, arranged in close proximity to said at least one first conductor, over the dielectric carrier and forming at least one area therebetween; and depositing a phosphor-based carrier in said at least one area between the first and second conductors, the first and second conductors arranged to excite the phosphors and generate light therefrom.
  • Another aspect of the present invention is directed to improving the brightness of the device or to improving the method, as described above, by applying a nonconductive material, such as DuPont 7153-type dielectric composition, over the patterned conductive buses, or by using another such material to increase capacitance between the alternately arranged conductors. It has been discovered that such implementation substantially increases the brightness. In a particular application, the brightness has been doubled by using a thin layer of this nonconductive material applied directly over the entire patterned conductive areas. Other materials of this type, e.g., other dielectric compositions, can be used as well.
  • a nonconductive material such as DuPont 7153-type dielectric composition
  • an electroluminescent display device is formed on a mirror having a metallized surface.
  • the metallized surface is selectively etched to define a first conductive bus having at least one first conductor and a second conductive bus having at least one second conductor arranged in close proximity to the at least one first conductor.
  • a phosphor-based carrier including phosphor therein is located proximate to the first and second conductors to permit an electric field set up by a voltage applied between the first and second conductors to generate light via the phosphor.
  • the mirror can form part of a liquid crystal device.
  • Another aspect of the present invention is directed to a method for manufacturing an electroluminescent display device on a mirror having a metallized surface.
  • the metallized surface is selectively etched, defining a first conductive bus having at least one first conductor and a second conductive bus having at least one second conductor in close proximity to the at least one first conductor and forming at least one area between the at least one first conductor and the at least one second conductor.
  • a phosphor-based carrier having a phosphor is deposited in the at least one area.
  • the first and second conductors are arranged to excite the phosphor and generate light therefrom in response to an applied voltage.
  • Fig. 1 is an exaggerated, perspective view of an electroluminescent display device, according to one embodiment of the present invention
  • Figs. 2a, 2b, and 2c illustrate respective top views of three different conductor layouts for exciting phosphor in an electroluminescent display device
  • Fig. 2d illustrates a perspective view of another conductor layout for exciting phosphor in an electroluminescent display device, each of the respective layouts being in accordance with the present invention
  • Fig. 3 is a side view of a backlit remote control device, according to a particular application and embodiment of the present invention, employing an electroluminescent display consistent with the illustration of Fig. I;
  • Fig. 4 is a top view of an electroluminescent display arranged as part of a combination key and integrated circuit, according to a particular application and embodiment of the present invention
  • Fig. 5 is a view of a backlit button configured as part of a set of buttons and an employing electroluminescent display consistent with the illustration of Fig. 1, all of which is in accordance with a particular application and embodiment of the present invention.
  • Fig. 6 is a view of an electroluminescent display arranged as part of a mirror, according to a particular application and embodiment of the present invention.
  • the present invention is believed to be useful for a variety of applications requiring or benefitting from display devices that can be implemented in relatively small areas. While the present invention is not intended to be so limited, an appreciation of the present invention is best obtained through a discussion of particular example applications, including an electroluminescent display device constructed in accordance with a particular embodiment of the present invention.
  • the display construction 10 includes first and second conductive buses 12 and 14 including respective first and second display runners or conductors 16 and 18.
  • a conventional electroluminescent inverter circuit 24 can be connected across the two buses 12 and 14 to set up an electric field and generate light via the phosphor material in the carrier.
  • the display generates light along a single line between the conductors 16 and 18.
  • the "buses" may be as illustrated as a wider portion of the conductor extending from the inverter terminal or may be constructed and arranged as merely an indistinguishable and continuous part of the conductor(s) emanating therefrom.
  • the conductors 16 and 18 of Fig. 1 are respectively replaced or supplemented by a plurality of first conductors 16a through 16k and a plurality of second conductors 18a through 18k.
  • the first conductors 16a through 16k are interleaved with the second conductors 18a through 18k, to create a multitude (eleven in the example illustration) of phosphor-energizable areas, one such area in the proximity of each opposing pair (e.g., 16a and 18a) of conductors.
  • Fig. 2b provides another example configuration wherein the bus conductors 12 and 14 are widened to increase the current-carrying capability of the buses and wherein the conductors, generally designated as 16 and 18, are interleaved and aligned in a zig-zag pattern for an esthetically-specific display application.
  • Other shapes including, but not limited to, curvilinear and non-linear shapes, can also be implemented as supplements or alternatives to the above conductor constructions.
  • Fig. 2c illustrates a configuration wherein the conductors 16 and 18 are serrated to form energy-generating tips.
  • the frequency of the tips per unit of linear measure is increased.
  • Fig. 2d illustrates a configuration wherein a fingered conductor 17 and a polarity-opposing graphic conductor 19 are separated by a dielectric 21, such as a thin sheet of mylar.
  • the conductor 17 is covered by (or, alternatively, covers) a layer of phosphor-based material.
  • the changing E-field at the opposing tips illuminates the shape of the graphic conductor 19 on the side of the clear dielectric 21 carrying the conductor 17.
  • the conductors 17, 19 and the phosphor-based material may be applied as described herein in connection with Figs. 2a, 2b and 2c.
  • the graphic conductor 19 is implemented as separated conductors with each separated conductor carrying the opposing charge in an alternative manner.
  • a control circuit such as a programmed microprocessor and selectable encoder (or functional equivalent such as an ASIC), passes the opposing charge to each of the separated conductors to illuminate selected portions of the desired graphic display.
  • a battery-operated remote control 28 includes, as integral parts, an electronic display 30, such as illustrated above, and a conventional switch circuit.
  • the electronic display 30 is printed on the control-access side of a printed circuit board
  • PCB 32 The PCB 32 carries conventional components (not shown in Fig. 3) including circuit-connecting conductors, a signal transmitter, and a control circuit.
  • the switch circuit includes a conductor-carrying depressor 34 opposite the PCB 32 and wire-terminating contacts 36 on the PCB adjacent the electronic display 30.
  • the depressor 34 includes at least a portion that is transparent to permit passage of light generated by the electronic display.
  • the electroluminescent inverter is optionally arranged as part of the control circuit carried by the PCB 32.
  • a battery circuit 24a is used, selectively or as required, to energize the electroluminescent inverter (24b of Fig. 3). For example, upon first engagement of any of the depressors of the remote control device, the control circuit switches power on to the electroluminescent inverter and maintains such power for a predetermined period of time to permit the user to distinguish the keys from one another.
  • the control circuit includes a conventional firmware- or hardware-implemented debounce circuit to prevent erroneous readings of the switches as can be caused by the user inadvertently striking the same switch repeatedly or multiple switches at about the same time.
  • Fig. 4 illustrates a battery-operated remote control key device 48 with integral parts including electronic displays 51a, 51b, 51c and 5 Id for backlighting associated switch circuits, the wire-terminating contacts of which are designated 54a, 54b, 54c and 54d.
  • Each of the electronic displays 51a, 51b, 51c and 5 Id are implemented on the surface side of an integrated-circuit (chip) and configured, for example, as indicated above in connection with Fig. 2a, 2b or 2c.
  • the battery circuit 24a for this implementation can be used selectively in response to engagement of a mechanical conductor.
  • rotation of the metallic portion 66 of the key device 48 can be used to short a pair of terminals 70 and, in turn, inform the control circuit 60 that the electroluminescent inverter 24b is to be energized for a predetermined period of time.
  • a user can depress a conductive, friction-fitting, slidable post 74 to provide the same input as rotating the key of the control circuit 60.
  • first engagement of any of the depressor portions of the switch circuit can inform the control circuit of the need to energize for the designated period of time, as described above in connection with Fig. 3.
  • Fig. 5 illustrates a portion of another remote control device having a plurality of hinged depressors 84 arranged in parallel and as part of an overall molded plastic unit 80.
  • the remote control device of Fig. 5 is similar to the device of Fig. 4 in terms of the display and switch construction and general electrical operation.
  • the remote control device of Fig. 5, however, includes an electroluminescent display 86 driven remotely from a control circuit having a driver providing (not shown in Fig. 5) energy to buses 87 and 88.
  • These buses 87 and 88 are printed as conductive strips along two arms 89 and 90 of the molded plastic unit 80.
  • the two arms 89 and 90 also carry buses 91 and 92 which connect to terminal ends 94 of a conventional switch circuit.
  • the two arms 89 and 90 serve as a hinge to permit the switch end of the molded plastic unit 80 to freely move upon engagement into the unshown conductive portion of the switch for shorting the terminal ends 94 and informing the control circuit of the engagement.
  • the electroluminescent display 86 is activated as described above in connection with Figs. 3 and 4 or, depending on the application, in response to another condition. For example, when used as a driver control panel in an automobile application, backlighting for depressors of the molded plastic unit 80 can be activated in response to opening the vehicle door, the keys being inserted into the ignition slot and/or engine startup.
  • control circuit is implemented in a form that best suits the application.
  • Some more sophisticated applications may require a program-based control circuit, such as a microprocessor or an ASIC (application-specific integrated circuit).
  • the control circuit may be implemented using conventional discrete analog and/or digital logic, such as pull-up resistors, diodes and wired- OR type circuitry.
  • the transmitter type may also be selected and/or designed to meet the needs of the specific application.
  • the inverter is also application-dependent. Included among the many inverter manufacturers are Motorola and NEC.
  • the electroluminescent display is manufactured by first applying the display conductors along with the switch conductors and buses where applicable. This is accomplished, e.g., by screen printing the conductors on, or etch-removing a previously-applied conductive layer from, a dielectric surface.
  • the dielectric surface may be any of a number of different types of substantially nonconducting surfaces, including but not limited to the protective housing of an IC, mylar, paper or virtually any type of plastic.
  • a phosphor-based carrier is deposited so as to cover the area or areas between the first and second conductors carrying the drive signals from the electroluminescent inverter. Alternatively, the phosphor-based carrier is deposited first, followed by application of the conductors.
  • the plastic components for example, used as supportive outer housings for the structures of Figs. 3-5, are manufactured using conventional techniques.
  • One such technique involves applying any needed graphics to the exposed side of a sheet of mylar, securing the conductors to the back side of the mylar as described above, forming the mylar as required by the application, cutting away and discarding the unused portion of the mylar, placing the remaining portion of the mylar into a mold and injecting plastic into the mold and onto the back side of the mylar.
  • Another aspect of the present invention is directed to improving the brightness of the device or as provided through the method, as described above, by applying a nonconductive material, such as DuPont 7153-type dielectric composition, over the patterned conductive buses, or by using another such material to increase capacitance between the alternately arranged conductors. It has been discovered that such implementation substantially increases the brightness. In a particular application, the brightness has been doubled by using a thin layer of a DuPont 7153-type nonconductive material applied directly over the entire patterned conductive areas.
  • a nonconductive material such as DuPont 7153-type dielectric composition
  • an electroluminescent display is incorporated into a mirror 300.
  • the mirror 300 has a metallized surface 302, on which a pattern of conductive traces is created using, for example, a laser (not shown) to etch the surface 302. Etching the surface 302 removes selected portions of the metallic coating, thus creating non-conductive areas. Those portions of the metallized surface 302 that are not etched away form conductive traces, e.g., bus conductors 306 and 308.
  • a phosphor-based carrier 304 is applied on the metallized surface 302 between bus conductors 306 and 308 and/or between other conductors.
  • a dielectric coating such as DuPont 7153-type dielectric composition, is optionally applied to the metallized surface 302 before applying the phosphor-based carrier 304.
  • a dielectric composition with different properties, e.g., dielectric strength and/or dielectric constant.
  • the desired dielectric strength depends on, for example, the separation between the conductors and the magnitude of the voltage applied to the conductors.
  • patterns can be created that are particularly useful for use in indicators, warnings, or other display types integrated into the mirror 300.
  • light shapes may be designed by selectively distributing the phosphor so that only selected areas of the conductors emit light. This can be advantageous in a number of applications, for example, those in which high volumes of structures including the traces are available for processing with phosphor.
  • a lamp can be incorporated as part of a liquid crystal display (LCD) to provide an integrated backlight.
  • LCD liquid crystal display
  • the conductive buses can be implemented using nonmetallic material, such as indium tin oxide. This aspect of the present invention is applicable to each of the various embodiments disclosed herein. Further, in applications where transparency throughout is desirable, a transparent ITO is effective in this regard.
  • an electroluminescent display is incorporated into a conventional electroluminescent polymer, such as implemented using the following formula:[to be supplied by the inventors], available from Uniax Corp. of Santa Barbara, California.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention porte sur un écran luminescent comportant de fines raies conductrices disposées sur surface revêtue d'un dépôt de phosphore. L'une des variantes de l'invention porte sur un dispositif comportant un support diélectrique portant un premier bus conducteur relié à de premiers conducteurs, et un deuxième bus conducteur relié à de seconds conducteurs. Les premiers et seconds conducteurs sont très proches, ce qui permet de placer entre eux un support à base de phosphore et de faire produire de la lumière par le phosphore sous l'effet d'un champ électrique due à une tension électrique appliquée entre les conducteurs. Une couche diélectrique placée entre les conducteurs renforce la luminosité de la lumière émise. Le dispositif électroluminescent peut s'incorporer à un miroir ou à un dispositif à cristaux liquides.
PCT/US1998/026111 1997-12-10 1998-12-09 Dispositif luminescent et procede associe WO1999030304A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP98960830A EP1042745A4 (fr) 1997-12-10 1998-12-09 Dispositif luminescent et procede associe
CA002313468A CA2313468A1 (fr) 1997-12-10 1998-12-09 Dispositif luminescent et procede associe
AU16334/99A AU1633499A (en) 1997-12-10 1998-12-09 Display device and method therefor
JP2000524781A JP2001526444A (ja) 1997-12-10 1998-12-09 ディスプレイ装置及びそのための方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US98801197A 1997-12-10 1997-12-10
US08/988,011 1997-12-10

Publications (2)

Publication Number Publication Date
WO1999030304A2 true WO1999030304A2 (fr) 1999-06-17
WO1999030304A3 WO1999030304A3 (fr) 1999-08-26

Family

ID=25533770

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/026111 WO1999030304A2 (fr) 1997-12-10 1998-12-09 Dispositif luminescent et procede associe

Country Status (5)

Country Link
EP (1) EP1042745A4 (fr)
JP (1) JP2001526444A (fr)
AU (1) AU1633499A (fr)
CA (1) CA2313468A1 (fr)
WO (1) WO1999030304A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1122984A3 (fr) * 2000-02-04 2003-02-12 Ritek Corporation Panneau d'affichage électroluminescent en couleur à longue durée de vie
US6541296B1 (en) 2001-11-14 2003-04-01 American Trim, Llc Method of forming electroluminescent circuit
WO2004091000A3 (fr) * 2003-04-09 2005-04-28 Robert Gustar Panneau electroluminescent segmente

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802317A1 (de) * 1988-01-27 1989-08-03 Beck Gerhard Dipl Ing Fh Lumineszierendes substrat
US5574327A (en) * 1992-07-28 1996-11-12 Philips Electronics North America Microlamp incorporating light collection and display functions
JPH06104087A (ja) * 1992-09-24 1994-04-15 Matsushita Electric Ind Co Ltd Ｅｌ装置
EP0678216B1 (fr) * 1992-12-16 2003-03-19 Durel Corporation Dispositifs a lampes electroluminescentes et leur fabrication
US6054809A (en) * 1996-08-14 2000-04-25 Add-Vision, Inc. Electroluminescent lamp designs

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1122984A3 (fr) * 2000-02-04 2003-02-12 Ritek Corporation Panneau d'affichage électroluminescent en couleur à longue durée de vie
US6541296B1 (en) 2001-11-14 2003-04-01 American Trim, Llc Method of forming electroluminescent circuit
WO2004091000A3 (fr) * 2003-04-09 2005-04-28 Robert Gustar Panneau electroluminescent segmente

Also Published As

Publication number Publication date
EP1042745A4 (fr) 2001-09-19
WO1999030304A3 (fr) 1999-08-26
AU1633499A (en) 1999-06-28
JP2001526444A (ja) 2001-12-18
EP1042745A1 (fr) 2000-10-11
CA2313468A1 (fr) 1999-06-17

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