US3641390A - Solid-state letter display device - Google Patents

Solid-state letter display device Download PDF

Info

Publication number
US3641390A
US3641390A US830706A US3641390DA US3641390A US 3641390 A US3641390 A US 3641390A US 830706 A US830706 A US 830706A US 3641390D A US3641390D A US 3641390DA US 3641390 A US3641390 A US 3641390A
Authority
US
United States
Prior art keywords
substrate
character
circuit
leads
display
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.)
Expired - Lifetime
Application number
US830706A
Inventor
Tadashi Nakamura
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.)
Noritake Itron Corp
Original Assignee
Ise Electronics Corp
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 Ise Electronics Corp filed Critical Ise Electronics Corp
Application granted granted Critical
Publication of US3641390A publication Critical patent/US3641390A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14—Semiconductor devices, e.g. diodes

Definitions

  • ABSTRACT A plurality of luminous diodes and a driving circuit therefor adapted to cause selected combinations of the luminous diodes to lurninesce to display selected letters are formed on the same or different sides of a substrate and the assembly is encapsulated by a transparent molded protective coating.
  • the driving circuit in the form of a diode matrix circuit is fabricated by the integrated circuit technique.
  • a light spot-type display device employing discharge tube-type display tubes, fluorescent display tubes or groups of small lamps.
  • discharge tube-type display tubes employing discharge tube-type display tubes, fluorescent display tubes or groups of small lamps.
  • These prior devices are not advantageous in that the physical dimensions of the devices are large when compared with those of the letter or characters to be displayed or the number of letters to be displayed because all .of these devices utilize vacuum tubes, require relatively high voltage and relatively large power, have poor space factor and require independent driving circuits.
  • the solid-state letter display device embodying this invention is characterized in that it does not utilize any vacuum tube and that it is of small size and thin.
  • Another feature of this invention lies in a solid-state letter display device wherein luminous diodes and a display driving circuit are formed on a single-semiconductor wafer as an integrated circuit and are then molded into a unitary structure.
  • Still further feature of this invention is to provide a solidstate letter display device capable of displaying a number of letters.
  • a solidstate letter display device characterized by comprising a substrate, a plurality of luminous diodes which are formed on the substrate and arranged such that when they are suitably combined they can display any desired letter, a driving circuit for selectively exciting the luminous diodes, said driving circuit being formed on the substrate by the integrated circuit technique and a protective coating encapsulating the substrate, the luminous diodes and the driving circuit.
  • the substrate may be an electric insulator, a metal plate or a semiconductor wafer.
  • FIG. 1 is a perspective view of a solid'state letter display device or unit embodying the principle of this invention with a portion of the casing broken away;
  • FIG. 2 is a partial sectional view showing the relation between a substrate and luminous elements
  • FIG. 3 shows a diagram of one example of a diode matrix driving circuit employed in this invention
  • FIG. 4 is a perspective view of a solid-state display device for displaying a plurality of letters.
  • FIG. 1 illustrating a perspective view, partly broken away, of a novel display unit for displaying digits
  • reference numeral indicates an insulating substrate of ceramic and the, like on which are formed a group of display elements a through h for constituting digits 0 through 9 inclusive wherein elements g and g are formed electrically integral.
  • These elements are comprised by luminous diodes having PN- 10 junctions.
  • the luminous diode is a solid-state luminous element typically consisting of GaAs, and as is well known in the art luminesces by the injection of charge carriers through the PN-junction by the application of a voltage and the recombination of such charge carriers.
  • a preformed group of luminous diodes a through h is bonded to the substrate 10.
  • a driving circuit 20 formed by the integrated circuit technique is also bonded to the substrate.
  • the substrate a driving circuit 20 formed by the integrated circuit technique
  • driving circuit is comprised by a diode matrix circuit adapted to select predetermined combinations of display elements and to cause them to luminesce to form desired digits.
  • a diode matrix circuit adapted to select predetermined combinations of display elements and to cause them to luminesce to form desired digits.
  • FIG. 3 One example of such a diode matrix circuit is illustrated in FIG. 3.
  • the diode matrix circuit shown in FIG.'3 is a so-called erasing system selecting circuit wherein the number of diodes utilized is decreased.
  • reference numeral 0 through 9 represent terminals corresponding to respective digits to be displayed and terminals a through h correspond to respective luminous diodes shown in FIG. 1. It is now assumed that after closing a switch S, a wiper W is connected to a terminal corresponding to a digit desired to be displayed, then the digit will be displayed by a selected combination of luminous diodes. Thus for example, digit 3 is assumed to be displayed.
  • the diode matrix circuit is fabricated by a well-known integrated circuit technique which may be either multitip, monolithic or mixed integrated circuit.
  • the circuit substrate 20 comprising an integrated circuit is of extremely small size.
  • the circuit substrate 20 is bonded to the substrate 10 either on the front surface thereof as shown in FIG. 1 or on the rear surface.
  • the circuit substrate 20 requires two more terminals for the source and ground. Thus there are 12 terminals. In FIG. I these terminals are shown by terminals T. v
  • FIG. 2 is a cross-sectional view to illustrate the manner of deriving out lead wires to respective elements when the circuit substrate 20 is bonded to the rear surface of the substrate 10. More particularly, luminous elements are bonded to the front surface of the substrate and two perforations ll and 12 are provided near the opposite ends of. each luminous element. Grounding lead 30 connected to the lower electrode of the luminous element extends through the perforation 11 while an exciting lead connected to the upper electrode extends through the perforation 12 to a driving circuit.
  • FIG. 1 shows a solid-state letter display device or unit embodying this invention.
  • the novel letter display device is characterized by having no vacuum tube or filament.
  • the luminous elements and mechanical vibrations and shocks are fabricated by the integrated circuit technique it is possible to operate them with low voltage and low power. For this reason the novel display device can be operated directly from an integrated circuit system. If the portion of the protective coating were constructed to act as an optical lens, more easy reading of the displayed letter would be possible. When suitably colored the coating acts as a filter. lnasmuch as the luminous elements utilized in this invention are comprised by luminous diodes, where indium and phosphorus are used in the semiconductor material, the luminous elements will emit red colored, while zinc and cerium provide blue colored. In this manner, letters of different colors can be displayed.
  • a plurality of independent luminous elements and an integrated driving circuit were bonded to a common insulating substrate of ceramic or the like, it will be obvious to those skilled in the art that such luminous elements and driving circuit may be formed on a single-semiconductor wafer by the integrated circuit technique.
  • a metal plate is utilized as the substrate to act as one of the electrodes of the luminous diodes, not only the construction of the assembly can be simplified but also the efficiency of heat dissipation can be improved.
  • FIG. 4 shows a perspective view of a modified embodiment of this invention wherein a plurality of display unitsshown in FIG. 1 are arranged in side by side relationship to simultaneously display a number of letters or numerals of several orders of magnitude. 7
  • a thin support substrate having a rectangular area generally the size of a character space occupied in a display
  • a set of plug connection terminals extending from one edge of said substrate, one terminal for each character to be selected and in addition power and ground terminals;
  • a unitary diode matrix decoder circuit supported on said substrate outside the area occupied by said character raster, said circuit having:
  • circuit connections from said power terminal through respective resistors to each lead of said first set ; and an encapsulating shell for said substrate providing a transparent area over the area occupied by said display elements and having said terminals projecting therefrom.

Abstract

A plurality of luminous diodes and a driving circuit therefor adapted to cause selected combinations of the luminous diodes to luminesce to display selected letters are formed on the same or different sides of a substrate and the assembly is encapsulated by a transparent molded protective coating. The driving circuit in the form of a diode matrix circuit is fabricated by the integrated circuit technique.

Description

United States Patent Nakamura 54] SOLID-STATE LETTER DISPLAY DEVICE [72] Inventor:
[73] Assignee:
Tadashi Nakamura, Ise-City, Japan lse Electronics Corporation, lse-City, Japan [22] Filed: Julie 5,1969
[211 App]. No.: 830,706
[30] Foreign Application Priority Data July 9, 1968 Japan ..43/476l9 52 us. c1 ..315/l69, 313/108 .1105 37/00 Field or Search ..307/303; 313/108, 108 1);
1451- 4 Feb. 8, 1972 [56] References Cited UNITED STATES PATENTS 2,951,970 9/1960 Matarese ..315/169 3,308,452 3/1967 Michel et al. ..315/169 x 3,330,983 7/1967 Cusano et a1... ..313/108 3,343,155 9/1967 Pahlavan ..3i5/l69 x 3,354,342 11/1967 Ohntrup 8t al ..3l5/169 x Primary Examiner-Roy Lake Assistant ExaminerLawrence J Dahl Attorney-Chittick, Pfund, Birch, Samuels & Gauthier [57] ABSTRACT A plurality of luminous diodes and a driving circuit therefor adapted to cause selected combinations of the luminous diodes to lurninesce to display selected letters are formed on the same or different sides of a substrate and the assembly is encapsulated by a transparent molded protective coating. The driving circuit in the form of a diode matrix circuit is fabricated by the integrated circuit technique.
1 Claims, 4 Drawing Figures SOLID-STATE LETTER DISPLAY DEVICE I BACKGROUND OF THE INVENTION This invention relates to a novel solid-state letter display device.
Among conventional letter display devices may be mentioned a light spot-type display device employing discharge tube-type display tubes, fluorescent display tubes or groups of small lamps. These prior devices are not advantageous in that the physical dimensions of the devices are large when compared with those of the letter or characters to be displayed or the number of letters to be displayed because all .of these devices utilize vacuum tubes, require relatively high voltage and relatively large power, have poor space factor and require independent driving circuits.
Recently developed electronic circuits require miniaturization of the display device itself, low operating voltage, small driving power and decreased thickness of the device because of the tendency of utilizing integrated circuits and large scale integrated.
SUMMARY OF THE INVENTION It is therefore an object of this invention to provide a new and improved letter display device which can eliminate disadvantages of the above described types of conventional display devices and can satisfy the requirements of modern display devices.
One of the features of this invention lies in a solid-state letter display device wherein well-known luminous diodes are used as the display elements, the display driving circuit is formed by the technique of the integrated circuit so that these elements are formed on a substrate and are then molded into a unitary structure. Accordingly, the solid-state letter display device embodying this invention is characterized in that it does not utilize any vacuum tube and that it is of small size and thin.
Another feature of this invention lies in a solid-state letter display device wherein luminous diodes and a display driving circuit are formed on a single-semiconductor wafer as an integrated circuit and are then molded into a unitary structure.
Still further feature of this invention is to provide a solidstate letter display device capable of displaying a number of letters.
In accordance with this invention there is provided a solidstate letter display device characterized by comprising a substrate, a plurality of luminous diodes which are formed on the substrate and arranged such that when they are suitably combined they can display any desired letter, a driving circuit for selectively exciting the luminous diodes, said driving circuit being formed on the substrate by the integrated circuit technique and a protective coating encapsulating the substrate, the luminous diodes and the driving circuit. The substrate may be an electric insulator, a metal plate or a semiconductor wafer.
BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages together with organization and operation of this invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawing in which:
FIG. 1 is a perspective view of a solid'state letter display device or unit embodying the principle of this invention with a portion of the casing broken away;
FIG. 2 is a partial sectional view showing the relation between a substrate and luminous elements;
FIG. 3 shows a diagram of one example of a diode matrix driving circuit employed in this invention and FIG. 4 is a perspective view of a solid-state display device for displaying a plurality of letters.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIG. 1 illustrating a perspective view, partly broken away, of a novel display unit for displaying digits, reference numeral indicates an insulating substrate of ceramic and the, like on which are formed a group of display elements a through h for constituting digits 0 through 9 inclusive wherein elements g and g are formed electrically integral. These elements are comprised by luminous diodes having PN- 10 junctions. The luminous diode is a solid-state luminous element typically consisting of GaAs, and as is well known in the art luminesces by the injection of charge carriers through the PN-junction by the application of a voltage and the recombination of such charge carriers. According to this invention, a preformed group of luminous diodes a through h is bonded to the substrate 10. As shown in FIG; 1, a driving circuit 20 formed by the integrated circuit technique is also bonded to the substrate. As will be described later in more detail, the
. driving circuit is comprised by a diode matrix circuit adapted to select predetermined combinations of display elements and to cause them to luminesce to form desired digits. One example of such a diode matrix circuit is illustrated in FIG. 3.
The diode matrix circuit shown in FIG.'3 is a so-called erasing system selecting circuit wherein the number of diodes utilized is decreased. In FIG. 3 reference numeral 0 through 9 represent terminals corresponding to respective digits to be displayed and terminals a through h correspond to respective luminous diodes shown in FIG. 1. It is now assumed that after closing a switch S, a wiper W is connected to a terminal corresponding to a digit desired to be displayed, then the digit will be displayed by a selected combination of luminous diodes. Thus for example, digit 3 is assumed to be displayed. Upon connecting the wiper W to terminal 3, diode D, will short circuit element f, diodes D and D element e and diodes D and D elements g and g. As a result, voltage is applied to elements a, b, c, d and h alone so that as can be readily understood from FIG. 1 these elements cooperate to display digit According to this invention the diode matrix circuit is fabricated by a well-known integrated circuit technique which may be either multitip, monolithic or mixed integrated circuit. In this manner, the circuit substrate 20 comprising an integrated circuit is of extremely small size. According to this invention, the circuit substrate 20 is bonded to the substrate 10 either on the front surface thereof as shown in FIG. 1 or on the rear surface. In addition to terminals 0 through 9, the circuit substrate 20 requires two more terminals for the source and ground. Thus there are 12 terminals. In FIG. I these terminals are shown by terminals T. v
As best shown in FIG. 3, it is necessary to connect circuit substrate 20 to respective luminous elements a through h. FIG. 2 is a cross-sectional view to illustrate the manner of deriving out lead wires to respective elements when the circuit substrate 20 is bonded to the rear surface of the substrate 10. More particularly, luminous elements are bonded to the front surface of the substrate and two perforations ll and 12 are provided near the opposite ends of. each luminous element. Grounding lead 30 connected to the lower electrode of the luminous element extends through the perforation 11 while an exciting lead connected to the upper electrode extends through the perforation 12 to a driving circuit.
A protective coating 40 of a resinous material, for example, is molded to encapsulate the assembly,- as shown in FIG. 1. In order to make visible the luminous elements, at least the front portion of the protective coating 40 should be transparent. Thus, FIG. 1 shows a solid-state letter display device or unit embodying this invention.
As can be noted from the foregoing description, the novel letter display device is characterized by having no vacuum tube or filament. In addition, since the luminous elements and mechanical vibrations and shocks. Further, as a driving circuit and luminous diodes are fabricated by the integrated circuit technique it is possible to operate them with low voltage and low power. For this reason the novel display device can be operated directly from an integrated circuit system. If the portion of the protective coating were constructed to act as an optical lens, more easy reading of the displayed letter would be possible. When suitably colored the coating acts as a filter. lnasmuch as the luminous elements utilized in this invention are comprised by luminous diodes, where indium and phosphorus are used in the semiconductor material, the luminous elements will emit red colored, while zinc and cerium provide blue colored. In this manner, letters of different colors can be displayed.
Although in the above embodiment, a plurality of independent luminous elements and an integrated driving circuit were bonded to a common insulating substrate of ceramic or the like, it will be obvious to those skilled in the art that such luminous elements and driving circuit may be formed on a single-semiconductor wafer by the integrated circuit technique. Where a metal plate is utilized as the substrate to act as one of the electrodes of the luminous diodes, not only the construction of the assembly can be simplified but also the efficiency of heat dissipation can be improved.
FIG. 4 shows a perspective view of a modified embodiment of this invention wherein a plurality of display unitsshown in FIG. 1 are arranged in side by side relationship to simultaneously display a number of letters or numerals of several orders of magnitude. 7
Although the invention has been shown and described in terms of preferred embodiments thereof numerous changes and modifications may occur to one skilled in the art within I the scope of this invention as defined in the appended claim.
What is claimed is:
1. A self-contained solid-state character decoder display device comprising:
a thin support substrate having a rectangular area generally the size of a character space occupied in a display;
a plurality of luminous PN-junction diode display elements supported on said substrate in the form of a character raster with power and ground electrical leads respectively from each side of said PN-junction projecting through said substrate; I
a set of plug connection terminals extending from one edge of said substrate, one terminal for each character to be selected and in addition power and ground terminals;
a unitary diode matrix decoder circuit supported on said substrate outside the area occupied by said character raster, said circuit having:
a first set of leads connected respectively to said power leads of said display elements and a second set of character selection leads with a diode connected selection circuit from each character selection lead of said second'set to a predetermined combination of leads of said first set,
circuit connections from said ground terminal to said ground leads of all of said display elements, and
circuit connections from said power terminal through respective resistors to each lead of said first set; and an encapsulating shell for said substrate providing a transparent area over the area occupied by said display elements and having said terminals projecting therefrom.

Claims (1)

1. A self-contained solid-state character decoder display device comprising: a thin support substrate having a rectangular area generally the size of a character space occupied in a display; a plurality of luminous PN-junction diode display elements supported on said substrate in the form of a character raster with power and ground electrical leads respectively from each side of said PN-junction projecting through said substrate; a set of plug connection terminals extending from one edge of said substrate, one terminal for each character to be selected and in addition power and ground terminals; a unitary diode matrix decoder circuit supported on said substrate outside the area occupied by said character raster, said circuit having: a first set of leads connected respectively to said power leads of said display elements and a second set of character selection leads with a diode connected selection circuit from each character selection lead of said second set to a predetermined combination of leads of said first set, circuit connections from said ground terminal to said ground leads oF all of said display elements, and circuit connections from said power terminal through respective resistors to each lead of said first set; and an encapsulating shell for said substrate providing a transparent area over the area occupied by said display elements and having said terminals projecting therefrom.
US830706A 1968-07-09 1969-06-05 Solid-state letter display device Expired - Lifetime US3641390A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4761968 1968-07-09

Publications (1)

Publication Number Publication Date
US3641390A true US3641390A (en) 1972-02-08

Family

ID=12780220

Family Applications (1)

Application Number Title Priority Date Filing Date
US830706A Expired - Lifetime US3641390A (en) 1968-07-09 1969-06-05 Solid-state letter display device

Country Status (3)

Country Link
US (1) US3641390A (en)
CA (1) CA930870A (en)
DE (1) DE1933330A1 (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715636A (en) * 1972-01-03 1973-02-06 Gen Electric Silicon carbide lamp mounted on a ceramic of poor thermal conductivity
US3781852A (en) * 1972-11-21 1973-12-25 Bowmar Instrument Corp Calculator display circuit
US3800177A (en) * 1971-12-20 1974-03-26 Motorola Inc Integrated light emitting diode display device with housing
US3827043A (en) * 1971-12-08 1974-07-30 Suwa Seikosha Kk Display device for numeric characters
US3855500A (en) * 1970-09-01 1974-12-17 Sony Corp Gaseous glow-discharge indicator system
US3889147A (en) * 1974-09-30 1975-06-10 Litton Systems Inc Light emitting diode module
US3890170A (en) * 1972-02-29 1975-06-17 Motorola Inc Method of making a multicolor light display by graded mesaing
US3918053A (en) * 1972-07-03 1975-11-04 Dialight Corp Digital display
US3924227A (en) * 1972-11-13 1975-12-02 Michael Stolov Digital display device
US3942065A (en) * 1974-11-11 1976-03-02 Motorola, Inc. Monolithic, milticolor, light emitting diode display device
US3950844A (en) * 1973-12-21 1976-04-20 The Marconi Company Limited Method of making L.E.D. arrays
US4019196A (en) * 1974-11-22 1977-04-19 Stanley Electric Co., Ltd. Indicating element and method of manufacturing same
USRE30556E (en) * 1974-11-22 1981-03-24 Stanley Electric Co., Ltd. Indicating element and method of manufacturing same
US4303915A (en) * 1977-08-19 1981-12-01 Angelo George D Silent communicator
US5432015A (en) * 1992-05-08 1995-07-11 Westaim Technologies, Inc. Electroluminescent laminate with thick film dielectric
US6160528A (en) * 1995-12-05 2000-12-12 Schneider Automation Display apparatus for programmable logic controllers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2416516A1 (en) * 1978-01-31 1979-08-31 Jaeger Display luminosity improvement device - uses filter made from thin layer of varnish for required transmission spectrum and placed before internal light source

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951970A (en) * 1957-03-25 1960-09-06 Sylvania Electric Prod Electroluminescent device
US3308452A (en) * 1962-12-24 1967-03-07 Ibm High speed electro-optical semiconductor display apparatus
US3330983A (en) * 1962-07-06 1967-07-11 Gen Electric Heterojunction electroluminescent devices
US3343155A (en) * 1964-01-06 1967-09-19 Marcel A Pahlavan Display apparatus
US3354342A (en) * 1964-02-24 1967-11-21 Burroughs Corp Solid state sub-miniature display apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951970A (en) * 1957-03-25 1960-09-06 Sylvania Electric Prod Electroluminescent device
US3330983A (en) * 1962-07-06 1967-07-11 Gen Electric Heterojunction electroluminescent devices
US3308452A (en) * 1962-12-24 1967-03-07 Ibm High speed electro-optical semiconductor display apparatus
US3343155A (en) * 1964-01-06 1967-09-19 Marcel A Pahlavan Display apparatus
US3354342A (en) * 1964-02-24 1967-11-21 Burroughs Corp Solid state sub-miniature display apparatus

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855500A (en) * 1970-09-01 1974-12-17 Sony Corp Gaseous glow-discharge indicator system
US3827043A (en) * 1971-12-08 1974-07-30 Suwa Seikosha Kk Display device for numeric characters
US3800177A (en) * 1971-12-20 1974-03-26 Motorola Inc Integrated light emitting diode display device with housing
US3715636A (en) * 1972-01-03 1973-02-06 Gen Electric Silicon carbide lamp mounted on a ceramic of poor thermal conductivity
US3890170A (en) * 1972-02-29 1975-06-17 Motorola Inc Method of making a multicolor light display by graded mesaing
US3918053A (en) * 1972-07-03 1975-11-04 Dialight Corp Digital display
US3924227A (en) * 1972-11-13 1975-12-02 Michael Stolov Digital display device
US3781852A (en) * 1972-11-21 1973-12-25 Bowmar Instrument Corp Calculator display circuit
US3950844A (en) * 1973-12-21 1976-04-20 The Marconi Company Limited Method of making L.E.D. arrays
DE2534608A1 (en) * 1974-09-30 1976-04-01 Litton Industries Inc VISUAL DISPLAY DEVICE
US3889147A (en) * 1974-09-30 1975-06-10 Litton Systems Inc Light emitting diode module
US3942065A (en) * 1974-11-11 1976-03-02 Motorola, Inc. Monolithic, milticolor, light emitting diode display device
US4019196A (en) * 1974-11-22 1977-04-19 Stanley Electric Co., Ltd. Indicating element and method of manufacturing same
USRE30556E (en) * 1974-11-22 1981-03-24 Stanley Electric Co., Ltd. Indicating element and method of manufacturing same
US4303915A (en) * 1977-08-19 1981-12-01 Angelo George D Silent communicator
US5432015A (en) * 1992-05-08 1995-07-11 Westaim Technologies, Inc. Electroluminescent laminate with thick film dielectric
US5634835A (en) * 1992-05-08 1997-06-03 Westaim Technologies Inc. Electroluminescent display panel
US5679472A (en) * 1992-05-08 1997-10-21 Westaim Technologies, Inc. Electroluminescent laminate and a process for forming address lines therein
US5702565A (en) * 1992-05-08 1997-12-30 Westaim Technologies, Inc. Process for laser scribing a pattern in a planar laminate
US5756147A (en) * 1992-05-08 1998-05-26 Westaim Technologies, Inc. Method of forming a dielectric layer in an electroluminescent laminate
US6160528A (en) * 1995-12-05 2000-12-12 Schneider Automation Display apparatus for programmable logic controllers

Also Published As

Publication number Publication date
DE1933330A1 (en) 1970-01-22
CA930870A (en) 1973-07-24

Similar Documents

Publication Publication Date Title
US3641390A (en) Solid-state letter display device
US4665342A (en) Screen printable polymer electroluminescent display with isolation
US3875456A (en) Multi-color semiconductor lamp
US3795830A (en) Led slidebase switchboard lamp
US6713956B2 (en) Display module including a plate for heat dissipation and shielding
US3824581A (en) Signal magnitude display device for converting an input electric signal into a visual display
US3504214A (en) Electroluminescent display device
GB2194373A (en) Information conversion device with auxiliary address lines for enhancing manufacturing yield
JP3219000B2 (en) LED display and manufacturing method thereof
US4081716A (en) Fluorescent display elements
US3800177A (en) Integrated light emitting diode display device with housing
US20190019781A1 (en) Transparent active matrix display comprising emitting pixels with colored light-emitting diodes
JP2006041380A (en) Light source device
US3780326A (en) Symbol display tube with auxiliary electrode
JPS6048090A (en) Fluorescent display unit
US3899826A (en) Scannable light emitting diode array and method
US3631285A (en) Electroluminescent displays
EP0369755A3 (en) Thin film electroluminescent edge emitter structure on a silicon substrate
US3426248A (en) Planar visual readout display devices
KR100748241B1 (en) High brightness led with protective function of electrostatic discharge damage and method of manufacturing the same
CA2024047C (en) Display tube assembly and mounting process thereof
US20020079505A1 (en) Semiconductor light unit and method for production of the same
JPH0347560B2 (en)
US3657587A (en) Alpha-numeric indicator
US3827048A (en) Alpha-numeric character display device and method, whose characters are formed of light emitting diodes