US3121824A - Electroluminescent information display system - Google Patents

Electroluminescent information display system Download PDF

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US3121824A
US3121824A US36663A US3666360A US3121824A US 3121824 A US3121824 A US 3121824A US 36663 A US36663 A US 36663A US 3666360 A US3666360 A US 3666360A US 3121824 A US3121824 A US 3121824A
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voltage
electrodes
input
output
sheet
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US36663A
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Talcsnick Sidney
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Verizon Laboratories Inc
GTE LLC
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General Telephone and Electronics Corp
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Priority to US36663A priority Critical patent/US3121824A/en
Priority to US36665A priority patent/US3132276A/en
Priority to GB21338/61A priority patent/GB985221A/en
Priority to BE605014A priority patent/BE605014A/fr
Priority to NL265970A priority patent/NL265970A/xx
Priority to FR865091A priority patent/FR1293339A/fr
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    • 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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • 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
    • H05B44/00—Circuit arrangements for operating electroluminescent light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/14—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by means of electrically scanned solid-state devices
    • 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
    • H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • this device for visually displaying applied input signals as discrete points on an electroluminescent panel.
  • this device comprises a rectangular electroluminescent phosphor layer atfixed to one surface of a rectangular sheet of piezoelectric material.
  • the piezoelectric sheet is provided with first and second parallel edges and third and fourth parallel edges, the third and fourth parallel edges being located between and perpendicular to the first and second edges.
  • the surface area of the electroluminescent layer is less than that of the piezoelectric sheet and its sides are parallel to the edges of the sheet.
  • a transparent conductive electrode is placed over the electroluminescent layer while a common grounded electrode is secured to the other side of the piezoelectric sheet.
  • First, second, and third. electrodes are secured to the piezoelectric sheet between its first, second, and third edges respectively and the electroluminescent layer.
  • the first and second electrodes are parallel to each other and adjacent to opposite sides of the electroluminescent layer while the third electrode is perpendicular to the first and second electrodes. All four edges of the sheet are provided with terminations which absorb, substantially without reflection, any incident elastic waves.
  • a first voltage pulse applied between the first electrode and the grounded electrode produces a mechanical strain in the piezoelectric sheet proportional to the amplitude of the first pulse.
  • a disturbance in the form of a first plane elastic wave accompanied by a first electric field is propagated from the first electrode toward the opposite edge of the sheet where it is absorbed by the termination.
  • the intensity of the electric field is proportional to the time rate of change of the strain that produced it; i.e. the intensity of the first electric field is proportional to the first time derivative of the first pulse.
  • second and third voltage pulses applied between the second and third electrodes respectively and the grounded electrode produce second and third plane elastic waves.
  • Each of these waves is accompanied by an electric field which is propagated from the corresponding electrode toward the opposite edge of the sheet where it is absorbed.
  • the intensity of the second electric field is proportional to the first time derivative of the second voltage pulse, while the intensity of the third electric field is proportional to the first time derivative of the third voltage pulse.
  • a fourth electrode is secured to the piezoelectric sheet between the fourth edge of the sheet and the electroluminescent layer.
  • a voltage pulse applied between this electrode and ground produces a fourth elastic wave accompanied by an electric field which propagates from the fourth electrode toward the opposite edge of the sheet where it is absorbed.
  • the four waves are caused to intersect upon the selected point resulting in a bright spot of light in the electroluminescent layer at this point. Since the electric fields are additive, the use of four Waves instead of three results in a brighter and more intense image.
  • the voltage pulses must be applied to the electrodes at precise time intervals dependent upon the input data and the characteristics of the piezoelectric sheet and the electroluminescent layer. Further, apparatus must be provided for sampling varying input voltages at a rate limited only by the velocity of the elastic waves in the piezoelectric sheet and by the width of the electroluminescent layer.
  • Another object of the invention is to provide an information display system in which the magnitudes of a pair of applied signals may be displayed as a single point relative to a pair of coordinate axes superimposed on an electroluminescent panel.
  • Still another object is to provide an information display system in which a varying input signal is sampled and periodically applied to an electroluminescent display panel.
  • a further object is to provide an extremely accurate information display system having high resolution which is relatively simple and inexpensive to manufacture.
  • an information display system in which voltage pulses are applied to the n electrodes of an electroluminescent display device of the type disclosed in the aforementioned application Serial No. 36,665.
  • Each of these voltage pulses produces an elastic wave, accompanied by an electric field, which is propagated through the piezoelectric sheet.
  • the Waves are made to intersect at a predetermined spot in the electroluminescent phosphor layer thereby causing the phosphor to glow at the point of intersection.
  • a pulse tirnhig circuit comprising a reference generator, a computer, it voltage comparators, and n pulse shaping circuits, is utilized in generating the voltage pulses.
  • One of the voltage comparators is controlled by the reference generator and a fixed input voltage, its function being to generate pulses for application at fixed periodic intervals to one of the n electrodes on the display device.
  • the remaining voltage comparator-s are coupled to both the reference generator and the computer.
  • Input signals applied to the computer are converted therein to nl voltage functions of the input signal.
  • Each of these n-1 voltage functions is applied to one of the remaining voltage comparators where it is compared with the output of the reference generator.
  • each of the 111 outputs from the computer has, in general, a different magnitude, each of the voltage comparators is triggered oil at a different time. As will be shown hereinafter, the voltage comparator pulses are initiated by the computer at the precise instants of time required to accurately exhibit the input data on display device.
  • the input signals are invariant with time, they may e applied directly to the computer. However, if the in put signals are changing with time, they must be sampled periodically and stored for subsequent application to the computer. Accordingly, each input signal is applied to the computer through sampling and memory circuits.
  • An erase-record generator controls the sampling and memory circuits initiating the removal of information already fed to the computer and the transfer of newly stored informa tion to the computer.
  • three channels are coupled to three corresponding electrodes on the display device.
  • they may be made to intersect at any point on the display panel thereby producing an illuminated spot.
  • the brightness of the spot may be increased by adding a fourth electrode and associated voltage comparator and pulse shaping circuits.
  • FIG. 1 is a cut-away perspective view of one type of display device used in the information display system
  • FIG. 2 is a block diagram ot the information display system including a partial plan view of the displa device of FIG. 1;
  • FIG. 3 depicts voltage waveforms useful in explaining the operation of the system of FF. 2;
  • FIG. 4 is a simplified schematic diagram of one of the sampler circuits.
  • FIG. 5 illustrates additional voltage waveforms occurign in the circuits of FIGS. 2 and 4.
  • FIG. 1 there is shown a thin, square, polar ized, ceramic piezoelectric sheet 1% comprising a lead titanate-lcad zirconate mixture.
  • a transparent conductive electrode 12 is affixed to the electroluminescent layer ll while a common grounded electrode 13 is secured to the opposite side of the piezoelectric sheet 16.
  • Each edge of the sheet is terminated in such manner as to absorb, substantially without reflection, any incident elastic wave propagated in the sheet. This is accomplished by coating the edges and imme iately adjacent portions of sheet 1t) with lead to provide terminations 14, 15, 16 and 17.
  • a first electrode A extending across the entire width of ti e electroluminescent layer 11 is secured to the piezoelectric sheet between the terminations l4 and the edge of the layer 11.
  • electrodes B, C, and D are secured to the piezoelectric sheet 16 between terminations 15, i6, and 17 respectively and the electroluminescent layer 11. While four electrodes have been illustrated in order to provide an image having increased brightness, it shall be understood that three electrodes are sufficient to uniquely define any point on the electroluminescent phosphor layer 11.
  • a voltage pulse between electrode A and grounded electrode 13 causes a first elastic wave to be propagated across the piezoelectric sheet 16 at constant speed toward absorbing termination 15.
  • This wave is accompanied by an electric field having an intensity proportional to the time rate of change of the pulse applied to electrode A.
  • a reverse wave also emanates from electrode A but is absorbed by termination 14 without affect ing the display.
  • voltage pulses applied to electrodes B, C, and D cause second, third, and fourth elastic waves, accompanied by corresponding electric fields, to be propagated at the same speed as the first wave toward terminations 14, 17, and 16 respectively.
  • the four elastic waves meet at the center resulting in a spot of light in the electroluminescent layer 11 having a brightness proportional to the total electric field produced by the four waves.
  • the four waves can be made to intersect at any selected point on the electroluminescent layer.
  • FIG. 2 there is shown a block diagram of the information display system together with a plan view of the display device. Although all of the blocks are illusrated as connected by a single lead, it will be understood that each component is connectcd to a common ground point and that all voltages are measured with respect to this ground.
  • the electroluminescent layer 11, together with its conductive film 12, is 2s units on each side and each electrode is spaced r units from the edge of the layer 11. Also, the velocity of propagation of the elastic waves through the piezoelectric material 10 in all directions has a constant magnitude v. Coordinate axes x and v, having their origin at the center of the electroluminescent layer, are superimposed on the display device to provide a reference for defining points on the face of layer 11.
  • a point P located x units to the right of the origin and y units above the origin, has been arbitrarily selected as the point to be illuminated. (Although the illuminated area is considered to be a point, it is actually a square having a length on each side of 30-40 mils or less.)
  • voltage pulses must be applied to the electrodes AD at specific intervals of time which will permit the elastic waves propagated through the piezoelectric sheet 16 to intersect simultaneously upon the point.
  • the application of voltage pulses to the display device is initiated by a trigger generator 20 at a time arbitrarily designated as t-O.
  • a pulse is applied to electrode A by sawtooth generator 21 and an elastic wave, accompanied by an electric field, is propagated through the piezoelectric sheet 10 toward point P.
  • the fixed delay t is equal to the time required for a wave to travel the distance 2s from one side of the electroluminescent layer to the opposite side. This delay is provided to permit a point located along the left hand side 35 of the electroluminescent layer to be displayed.
  • a wave must leave electrode B with such timing as to traverse the distance r+2s and arrive :at edge 35 simultaneously with the arrival of the wave from electrode A; the wave from electrode A having traveled the relatively short distance r.
  • the time (measured from 1:0) required for a wave originating at electrode A to arrive at the point P is where in order for an elastic wave originating at electrode B to arrive at point P at time 1 it must leave electrode B at a time interval t after the trigger pulse.
  • a wave must leave electrode C at a time for all four waves to arrive simultaneously at point P.
  • trigger pulses are applied periodically by trigger generator 2t) to the input of a reference generator 25.
  • These trigger pulses (FIG. 3a) are generated at intervals equal to 3t this interval corresponding to the maximum time required for all four elastic waves to completely clear the display'area regardless of the location of the point P.
  • Each trigger pulse initiates a sawtooth output voltage (-FIG. 3b) from reference generator 25 which is applied through a lead 26 to voltage comparators 2'7, 28, 29, and 30.
  • the duration of each reference sawtooth is equal to Zt the time between adjacent sawtooth voltages being z
  • Voltage comparators 27-30 may be of the type em ploying two input and one output connections as shown in FIGS.
  • Pulse 32 is then differentiated in ditferentiator 33, the negative pulse produced by the trailing edge of pulse 32 removed by clipperamplifier 34, and the remaining positive pulse applied to multivibrator 36 which generates a pulse of suificient amplitude and duration to trigger sawtooth generator 21.
  • the output of sawtooth generator 21 is applied to electrode A.
  • 'It comprises a first sawtooth portion 37 (FIG. 3g) having a steep negative slope and a second sawtooth portion 38 having a more gradual positive slope.
  • Triggering of the first sawtooth portion 37 occurs coincidently with the leading edge of the output 32 of Voltage compmator 27 and therefore is delayed by an Since the magnitude of the electric field accompanying the elastic wave in the piezoelectric sheet is proportional to the derivative of the applied voltage, the rapidly changing sawtooth 37 produces a large electric field in the layer 11.
  • the relatively slowly changing sawtooth portion 38 has a much smaller derivative and, therefore, any electric field produced by it has no significant effect on the display.
  • Two input signals x and y which determine the location of the point P, are applied through amplifiers 49, 41 and x and y samplers 42, 43 respectively to the input of a computer 44.
  • Computer 44 using conventional analog computer circuitry, produces first, second, and third output voltages proportional to t t and 13 respectively in accordance with Equations 2, 3 and 4.
  • the first output of computer 44 is coupled by a lead 45 to voltage comparator 23 where its magnitude is compared with the magnitude of the reference sawtooth produced by generator Q5.
  • a pulse (FIG. 3d) is produced by comparator 23 which triggers sawtooth generator 22 through pulse shaping circuits 46.
  • the rapidly changing portion 47 of the output of sawtooth generator 22 is initiated an interval t alter the trigger pulse, this voltage being applied to electrode B.
  • the second and third outputs of computer 4% are connected to voltage comparators 29 and 3% by leads 48 and 4-9 respectively.
  • the pulses shown in FIGS. 32 and 3 respectively are generated. These pulses are coupled through pulse shaping circuits 54 and 51 to sawtooth generators 2-3 and 24 respectively having the output voltage Waveforms shown in FIGS. 31' and 3 j.
  • voltages are applied to electrodes AD at precisely the instants of time required to have the elastic waves converge simultaneously on point P.
  • any point on the electroluminescent layer it may be defined and displayed using only three electrodes.
  • the use of four electrodes provides greater brightness and this increased brightness is sufiici-en t in some application to justify the use of additional components.
  • the elastic waves generated by each of the pairs of perpendicular electrodes produce diagonal lines across the electroluminescent layer 11 which may appear faintly in the background.
  • the point of intersection P of the three or four waves is suiliciently brighter than these spurious lines to prevent any significantly adverse effect on the readability of the display.
  • the magnitudes of the x and y input signals are invariant with time, they may be connected directly to the input terminals of computer 44 without first being applied to samplers 42 and 43. However, if the inputs are changing with time, they must be sampled periodically in order to provide constant amplitude signals for comparators 284%. This is accomplished by sampling the outputs of x and y amplifiers 4d, 41 once during each cycle of trigger generator 20 and applying the outputs of samplers 42 and 43 to the input of computer 44-.
  • a schematic diagram of the circuit of x sampler 42 is shown in F1 ⁇ . 4.
  • the circuit of y sampler 43 and its mode of operation is identical to that of x sampler 42 and therefore has not been illustrated.
  • x sampler 42 is coupled by means of a terminal on to the output of amplifier 413 and by a terminal d1 to the output of the erase-record generator s2 (FIG. 2).
  • Terminal as is coupled through a resistor 64- and a diode 65 to an output terminal 66, while terminal or is coupled through a resistor 67 and capacitor 6-8 to the output terminal cs.
  • a bias voltage source 69 having a constant magnitude V is connected to output terminal 66 through a resistor 7d and a diode 71.
  • Resistors 64, 67, and 7d are small in magnitude and may comprise the internal impedances of the associated voltage sources. As shown in FIGS. 5]) and 5c, the erase-record generator 62 is triggered by the trailing edge of the output voltage of reference generator 25. The output of erase-record generator 62 comprises a short positive pulse having a magnitude V followed by a short negative pulse having the same magnitude.
  • the output of x amplifier ll is shown in HG. 5d.
  • This voltage corresponds to the input signal and is arbitrarily assumed to have a sawtooth waveiorm and a he quencywhich is low compared to the repetition rate of the trig er generator 20.
  • the output of amplifier 49 comprises A.-C. component having a zero average value and a D.-C. component having a value V/2.
  • the bias voltage V/2 has been introduced to assure that with zero input the spot will be at the center of the display. By adjusting the magnitude of this bias voltage the position of the spot on the panel may be shifted.
  • the maximum amplitude of the A.-C. component is limited to V/ 2 by adjusting the gain of amplifier 4h.
  • capacitor 68 (FIG. 4) will be initially uncharged. Since the output of erase-record generator 62 is initially zero and capacitor 68 has no voltage across it, the voltage at output t rminal 66 will be zero as shown at in FIG. 5e. When the positive 6 pulse 76 5c) is applied to terminal 61, the voltage across capacitor 68 is instantaneously increased to a value V and therefore the output of x sampler 42 also rises to a value V as shown at 77.
  • the positive erase-record generator pulse '76 is abruptly followed by a short negative pulse 78 causing diode 65 to conduct and the voltage on o tput terminal 65 to drop to a value equal to the voltage (-V-lapplied to terminal 60 by amplifier 4%
  • the output of erase-record generator 62 then rises abruptly to zero and the voltage stored across capacitor 68 is held at the value e as shown in FIG. 52.
  • the signals applied to the display device by electrodes A-D may be amplitude modulated by coupling a modulation signal M to sawtooth generators 21-24 by means of an amplifier
  • the display device may also be modulated by applying a voltage between transparent electrode 12 and the comrnon grounded electrode 13.
  • An information display system comprising a sheet of piezoelectric material, an electroluminescent layer affixed to the surface of said sheet, at least three electrodes secured to the surface of said sheet adjacent said electroluminescent laycr, two of said electrodes ext nding along opposite sides of said electroluminescent layer and a third of said electrodes extending between said two electrodes, reference voltage means, computing means having a plurality of output terminals, said computing means producing a plurality of output voltages in response to applied input voltage signals, the magnitude of each of said output voltages being proportional to the time required for an elastic wave to travel through said piezoelectric sheet from a corresponding one of said electrodes to a point on said electroluminescent layer, said output voltages being functions of said applied input voltage signals, a like plurality of voltage comparators each having first and second inputs, said first inputs being coupled to said reference voltage means, means coupling each of the output terminals of said computing means to the second input of a corresponding one of said voltage comparators, each of said voltage compar
  • An information display system comprising a sheet of piezoelectric material; an electroluminescent layer affixed to the surface of said sheet; first, second and third electrodes secured to the surface of said sheet adjacent said electroluminescent layer, said first and second electrodes being parallel to each other and affixed to the surface of said sheet adjacent opposite sides of said electroluminescent layer and said third electrode being located adjacent said electroluminescent layer and perpendicular to and between said first and second electrodes; reference voltage means; computing means responsive to the magnitudes of first and second applied input voltage signals and producing first and second output voltages, each of said output voltages being proportional to the time required for an elastic wave to travel through said piezoelectric sheet from a corresponding one of said electrodes to a point on said electroluminescent layer, said first and second output voltages being functions of said first and second applied input voltage signals; first, second, and third voltage comparators each having first and second inputs, said first inputs being coupled to said reference voltage means, means coupling the first and second output terminals of said computing means to
  • An information display system comprising a sheet of piezoelectric material; an electroluminescent layer affixed to the surface of said sheet; first, second, third, and fourth electrodes secured to the surface of said sheet adjacent said electroluminescent layer, said first and second electrodes being parallel to each other and atfixed to the surface of said sheet adjacent opposite sides of said electroluminesccnt layer and said third and fourth electrodes being parallel to each other and afiixed to the surface of said sheet adjacent opposite sides of said electroluminescent layer, said third and fourth electrodes being located between and perpendicular to said first and second electrodes; reference voltage means; computing means responsive to the magnitudes of first and second applied input voltage signals and producing first, second and third ouput voltages, each of said output voltages being proportional to the time required for an elastic wave to travel through said piezoelectric sheet from a corresponding one of said electrodes to a point on said electroluminescent layer, said first, second and third output voltages bcing functions of said first and second applied input voltage signals;
  • An information display system for displaying applied input voltage signals comprising a sheet of piezoelectric material, an electroluminescent layer affixed to the surface of said sheet, at least three electrodes secured to the surface of said sheet adjacent said electroluminescent layer, two of said electrodes extending along opposite sides of said electroluminescent layer and a third of said electrodes extending between said two electrodes, reference voltage means, computing means producing a plurality of output voltages, each of said voltages being proportional to the time required for an elastic wave to travel through said piezoelectric sheet from a corresponding one of said electrodes to a point on said electroluminescent layer, said output voltages being functions of said applied input voltage signals, a plurality of voltage comparators each having first and second inputs, said first inputs being coupled to said reference voltage means, means coupling each of the output terminals of said computing means to the second input of a corresponding one of said voltage comparators, sampling means adapted to receive said applied input voltage signals coupled to said computing means, said sampling means periodically applying a voltage proportional to
  • An information display system for displaying first and second applied input voltage signals comprising a sheet of piezoelectric material, an electroluminescent layer affixed to the surface of said sheet, first, second, and third electrodes secured to the surface of said sheet adjacent said electroluminescent layer, said first and second electrodes being parallel to each other and afllxed to the surface of said sheet adjacent opposite sides of said electroluminescent layer and said third electrode being located adjacent said electroluminescent layer and perpendicular to and between said first and second electrodes, reference voltage means, computing means producing first and second output voltages, each of said first and second output voltages being proportional to the time required for an elastic wave to travel through said piezoelectric sheet from a corresponding one of said electrodes to a point on said electroluminescent layer, said first and second output voltages being functions of said first and second applied input voltage signals, first, second, and third voltage comparators each having first and second inputs, said first input being coupled to said reference voltage means, means coupling the first and second output terminals of said computing
  • An information display system comprising a sheet of piezoelectric material, an electroluminescent layer affixed to the surface of said sheet, 11 electrodes secured to the surface of said sheet adjacent said electroluminescent layer where n equals at least three, two of said electrodes extending along opposite sides of said electroluminescent layer and a third of said electrodes extending between said two electrodes, 11 sawtooth generators each having its outputs coupled to a corresponding one of said It electrodes, reference voltage means having a recurrent linearly increasing output voltage, n voltage comparators each having first and second inputs, said first inputs being coupled to said reference voltage means, computing means having n-l output terminals coupled to the second inputs of n-1 of said voltage comparators, each of said voltage comparators producing an output voltage when the voltage applied to its first input bears a predetermined ratio to the voltage applied to its second input, means for coupling m input Voltage signals to the input of said computing means, said computing means producing at its n'l output terminals voltages which are functions of said
  • said means for coupling input voltage signals to the input of said computing means comprises in sampling means each having first and second inputs and an output coupled to said computing means, means for applying each of said In signals to the first input of a corresponding one of said sampling means, erase-record means coupled to said reference voltage means and to the second inputs of each of said sampling means, said erase-record means providing a first voltage to said sampling means for erasing input data stored therein and a second voltage for storing input .data corresponding to the input voltage signal concurrently applied to the first input of said sampling means.
  • modulation means responsive to an applied modulation signal is coupled to each of said It sawtooth generators.
  • An information display system comprising a sheet of piezoelectric material; a rectangular electroluminescent layer fixed to the surface of said sheet, said electroluminescent layer having first and second parallel edges and third and fourth parallel edges perpendicular to said first and second parallel edges; first, second, third and fourth linear electrodes secured to the surface of said sheet adjacent the first, second, third and fourth edges respectively of said electroluminescent layer; reference voltage means; computing means responsive to the magnitudes of first and second applied input voltage signals and having first, second, and third output terminals, the voltage produced at said first computer output terminal being proportional to the magnitude of said first applied input voltage signal, the voltage produced at said second computer output terminal being proportional to the difference between the magnitudes of said first and second input voltage signals, and the voltage produced at said third computer output terminal being proportional to the sum of the magnitudes of said first and second input voltage signals; first, second, third and fourth voltage comparators each having first and second inputs, said first inputs being coupled to said reference voltage means; means coupling the first, second, and third output terminals of said

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US36663A 1960-06-16 1960-06-16 Electroluminescent information display system Expired - Lifetime US3121824A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US36663A US3121824A (en) 1960-06-16 1960-06-16 Electroluminescent information display system
US36665A US3132276A (en) 1960-06-16 1960-06-16 Electroluminescent display device
GB21338/61A GB985221A (en) 1960-06-16 1961-06-13 Information display system
BE605014A BE605014A (fr) 1960-06-16 1961-06-15 Système indicateur de renseignements
NL265970A NL265970A (Sortimente) 1960-06-16 1961-06-15
FR865091A FR1293339A (fr) 1960-06-16 1961-06-15 Dispositif pour l'affichage d'information

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US36663A US3121824A (en) 1960-06-16 1960-06-16 Electroluminescent information display system

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US3121824A true US3121824A (en) 1964-02-18

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BE (1) BE605014A (Sortimente)
GB (1) GB985221A (Sortimente)
NL (1) NL265970A (Sortimente)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202868A (en) * 1962-10-24 1965-08-24 Gen Telephone & Elect Electroluminescent-piezoelectric bar graph display system
US3277339A (en) * 1963-04-05 1966-10-04 Vincent L Carney Electroluminescent scanning and display system
US3453595A (en) * 1964-06-30 1969-07-01 Ibm Optic to acoustic converter for pattern recognition
US4654715A (en) * 1980-07-10 1987-03-31 Michel Feldmann Flat screen display system using a two-dimension surface acoustic wave (SAW) scanning

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59138184A (ja) * 1983-01-28 1984-08-08 Citizen Watch Co Ltd マトリクスカラ−テレビパネル駆動回路

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816236A (en) * 1956-06-19 1957-12-10 Gen Electric Method of and means for detecting stress patterns
US2922923A (en) * 1959-03-19 1960-01-26 Sylvania Electric Prod Electroluminescent devices
US2951168A (en) * 1958-11-28 1960-08-30 Sylvania Electric Prod Electroluminescent device
US3035200A (en) * 1959-11-25 1962-05-15 Sylvania Electric Prod Electroluminescent display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816236A (en) * 1956-06-19 1957-12-10 Gen Electric Method of and means for detecting stress patterns
US2951168A (en) * 1958-11-28 1960-08-30 Sylvania Electric Prod Electroluminescent device
US2922923A (en) * 1959-03-19 1960-01-26 Sylvania Electric Prod Electroluminescent devices
US3035200A (en) * 1959-11-25 1962-05-15 Sylvania Electric Prod Electroluminescent display device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202868A (en) * 1962-10-24 1965-08-24 Gen Telephone & Elect Electroluminescent-piezoelectric bar graph display system
US3277339A (en) * 1963-04-05 1966-10-04 Vincent L Carney Electroluminescent scanning and display system
US3453595A (en) * 1964-06-30 1969-07-01 Ibm Optic to acoustic converter for pattern recognition
US4654715A (en) * 1980-07-10 1987-03-31 Michel Feldmann Flat screen display system using a two-dimension surface acoustic wave (SAW) scanning

Also Published As

Publication number Publication date
BE605014A (fr) 1961-10-02
GB985221A (en) 1965-03-03
NL265970A (Sortimente) 1964-07-10

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