US3886403A - Brightness modulation system for a plasma display device - Google Patents

Brightness modulation system for a plasma display device Download PDF

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US3886403A
US3886403A US319941A US31994172A US3886403A US 3886403 A US3886403 A US 3886403A US 319941 A US319941 A US 319941A US 31994172 A US31994172 A US 31994172A US 3886403 A US3886403 A US 3886403A
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electrodes
signals
group
combination
cells
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Kenichi Owaki
Shozo Umeda
Hiroshi Furuta
Tadatsugu Hirose
Michihiro Shimuzi
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Fujitsu Ltd
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Fujitsu Ltd
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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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2074—Display of intermediate tones using sub-pixels
    • 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
    • G09G3/28—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 luminous gas-discharge panels, e.g. plasma panels
    • G09G3/282—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 luminous gas-discharge panels, e.g. plasma panels using DC panels
    • 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
    • G09G3/28—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 luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—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 luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—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 luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/292—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 luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
    • G09G3/2922—Details of erasing
    • 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
    • G09G3/28—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 luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—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 luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—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 luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/293—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 luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for address discharge
    • 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
    • G09G3/28—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 luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—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 luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—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 luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/294—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 luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
    • 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
    • G09G3/28—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 luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—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 luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • 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
    • H04N3/12—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by switched stationary formation of lamps, photocells or light relays
    • H04N3/125—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by switched stationary formation of lamps, photocells or light relays using gas discharges, e.g. plasma
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms

Definitions

  • ABSTRACT A brightness modulation system for a plasma display panel device in which one picture element is made up of a plurality of discharge cells, the brightness levels of the plurality of discharge cells are made different from each other by impression of voltages of different phases or repetitive frequencies and the discharge cells BRIGHTNESS MODULATION SYSTEM FOR A PLASMA DISPLAY DEVICE Inventors: Kenichi Owaki, Kobe; Shozo Umeda, Kakogawa; Hiroshi Furuta, Akashi; Tadatsugu Hirose, Akashi; Michihiro Shimuzi, Akashi, all of Japan Assignee: Fujitsu Limited, Japan Filed: Dec. 29, 1972 Appl. No.: 319,941
  • This invention relates to a brightness modulation system for a plasma display device in which one picture element is made up of a plurality of cells and the numbers of the cells energized within a certain period of time are made different from each other, thereby to display an image with a plurality of graded tones.
  • the system (1) requires screens and encounters a difficulty in enhancement of resolution.
  • the systems (2) and (3) it is possible to set only two to three wall voltage levels, so that the degree of gradation cannot be raised and, further, the required sustain voltage circuit is complicated because of using several kinds of combined voltage waveforms.
  • a special address voltage for writing and erasing is required, and the required address circuit is also complicated.
  • the system (4) requires a plurality of panels, and hence is uneconomical.
  • One object of this invention is to provide a brightness modulation system with which many gradation degrees can easily be obtained by a plasma display panel.
  • Another object of this invention is to provide a brightness modulation system in which the construction for producing a sustain voltage for a gradation display is simplified.
  • the brightness modulation system of this invention for a plasma display device having a plurality of electrodes disposed in a matrix manner in opposing relation to each other with a discharge gas space therebetween, is characterized in that each picture element is made up of a plurality of cells formed at intersecting points of the electrodes; voltages of different phases or repetitive frequencies are impressed on the cells forming each picture element to make the numbers of times of their radiation different. Further, each picture element is graded by the combination of the cells.
  • FIG. 1 shows waveform diagrams, for explaining the operation of one example of this invention
  • FIG. 2 is a diagram for explaining the electrode arrangement of a display panel of this invention.
  • FIGS. 3A to 3E, inclusive, show waveforms for explaining one example of writing and erasing operations of this invention
  • FIGS. 4 and 5 show waveforms for explaining the operation of other examples of this invention.
  • FIG. 6 is a block diagram illustrating another example of this invention as being applied to a TV receiver
  • FIG. 7 is a circuit diagram of a gate circuit incorporated in the example of FIG. 6;
  • FIG. 8 is a circuit diagram of another gate circuit incorporated in the example of FIG. 6;
  • FIG. 9 shows timing pulse waveforms
  • FIGS. 10 and 11 are circuit diagrams showing examples of circuits for providing sustain voltages
  • FIG. 12 shows waveform diagrams, for explaining the operations of the circuit of FIGS. 10 and 11;
  • FIG. 13 is a diagram for showing the electrode arrangement of a plasma display panel
  • FIGS. 14 and 15 are, respectively, illustrative circuit diagrams of a driver circuit and a mixer circuit connected to the X electrodes of the panel display of FIG. 6;
  • FIGS. 16 and 17 are, respectively, illustrative circuit diagrams of a driver circuit and a mixer circuit connected to the Y electrodes of the display panel of FIG. 6.
  • FIG. 1 there are shown waveform diagrams for explaining the operation of one example of this invention, which corresponds to the case where the brightness levels of respective cells I to IV, as depicted in FIG. 2, are selected at l, 2, 4 and 8.
  • Voltages Vxa and Vxb are impressed to electrodes xa and xb of a plasma display panel, respectively, and votages Vya and Vyb are impressed to electrodes ya and yb, respectively.
  • the cell I is supplied with a voltage V, which is the difference between the voltages Vxa and Vya and the cells II, III and IV are supplied similarly with voltages V V and V respectively.
  • FIGS. 3A to 3E show a series of waveform diagrams, for explaining the operation of one example of writing and erasing operations based on brightness information.
  • Reference character Vx in FIG. 3A indicates a voltage impressed to the electrodes .m or .tb
  • V in FIG. 3B refers to a voltage impressed to the electrode ya or yb, each of which is normally a sustain voltage having a peak value Vs as indicated by a dotted line and whose pulse interval is such as depicted in FIG. 1.
  • Those electrodes selected by input information are supplied with half-selection write-in voltages WXP and WYP, respectively, and selected cells are supplied with a voltage Vx-Vy. so that a voltage Vr' ⁇ see FIG.
  • V des- 7 ignates a wall voltage in the case of the half-selected cells being lighted and V refers to a wall voltage in the case of the cells being not lighted.
  • an erasing voltage EXP is impressed to the selected electrodes xa or xb and an erasing voltage EYP is impressed to the selected electrode ya or yb, so that an erasing pulse EP shown in FIG. 3C is impressed to the selected cells, by which the level of the wall voltage V is reduced as shown, thus achieving erasing.
  • the half-selected cells in this case are supplied with the voltage EXP and EYP of the waveforms Vcx and Vcy of FIGS. 3D and 3E.
  • FIG. 4 shows a series of waveform diagrams, for explaining the operation of another example of this invention, in which the brightness levels of the cells I, II, III and IV shown in FIG. 2 are selected to be I, 8, 4 and 2, respectively.
  • the electrodes ya and yb are supplied with the voltages Vya and Vyb of different phases, and the electrodes xa and .rb are supplied with the voltages Vxa and Vxb of different pulse intervals, impressing the voltages V, to V to the cells I to IV, respectively.
  • the half-selection write-in voltages WYP and WXP are impressed to the electrodes ya and X0, respectively.
  • the write-in pulse WP is impressed to the cell I to write therein and discharge radiation takes place twice within the period T as indicated by SPI.
  • the half-selection cell II is supplied with only the half-selection write-in voltage WXP of the voltage V the state of the cell II does not change.
  • the half-selection cell III the half-selection write-in voltages WYP and WXP are impressed, respectively, to the electrodes yb and xa at the same time, so that the writein pulse WP is applied to the cell II to produce discharge radiation sixteen times within the period T as indicated by SPII because such a voltage as indicated V is impressed to the cell II.
  • writing can be achieved in a similar manner. Since the cells I to IV discharge to emit radiation at such times as indicated by SF] to SPIV, the brightness levels become different from one another and a display with l6 gradations can be achieved by the combination of the cells.
  • FIG. 5 shows a series of waveform diagrams. for ex plaining the operation of another example of this inven' tion, in which the brightness levels of the cells I, II, III and IV, shown in FIG. 2 are l, 8, 2 and 4, respectively.
  • the electrodes ya and yb are always supplied with the voltages Vya and Vby of different phases and the electrodes x0 and xb are supplied selectively with voltages Vxal and Vxblll; VxbIV and Vxull; and Vxblll, VxbIV, and Vxal, Vxall, respectively, in accordance with brightness information.
  • the memory function due to the wall voltage is not used and discharge radiation is repeated at such times that a voltage higher than the discharge voltage is impressed to a selected cell.
  • the voltage Vxal is applied to the electrode .ru, so that the cell I is supplied with the voltage V, to cause a discharge to radiate at the times indicated by SP.
  • the cell discharges once in the period T. Impressing the voltage VxbIIl to the electrode xh, its timing coincides with that of the voltage Vya in the cell III twice in the period T to increase the impressed voltage, causing a discharge twice.
  • FIG. 6 is a block diagram illustrating an example of this invention as being applied to a television receiver, which employs a plasma display panel 10 capable of the diaplay of 16 graded levels, as described above.
  • a sustain voltage of FIGS. 1 or 4 is impressed to the plasma display panel 10 through mixer circuits 14 and 16.
  • a television signal is received by a receiver 18 and horizontal and vertical synchronizing signals H88 and VSS separated from a video signal are applied to a controller 20.
  • the number of the norizontal synchronizing signals HSS appearing between the vertical synchronizing signals VSS is counted and where Y electrodes are 512 and no interlace scanning is achieved, 256 pulses are sequentially provided between the verti cal synchronizing signals VSS at equal intervals.
  • the controller 20 applies write-in timing pulses TS, TA and TB to a gate circuit 24 and the write-in timing pulses TA and TB to a gate circuit 26 with the horizontal and vertical synchronizing signals H88 and VSS.
  • the AID converter 28 converts the brightness level into a 4-bit digital signal, which is stored in a shift register 30.
  • the shift register 30 has stored therein the digital signal of one horizontal line period, its stored content is read-out by the horizontal synchronizing signal H55 and applied to a buffer register 32.
  • a write-in pulse is impressed to the X electrodes of the plasma display panel through the gate circuit 24, a driver 34 and the mixing circuit 14.
  • the output from the counter-decoder 22 is applied to the Y electrodes of the plasma display panel 10 through the gate circuit 26, a driver 36 and the mixing circuit 16 to effect writing in discharge cells formed at the intersecting points of the X and Y electrodes.
  • the Y electrodes arranged in pairs are supplied with voltages following the timing pulses TA and TB and are scanned in accordance with the output from the counter-decoder 22.
  • the X electrodes, also arranged in pairs are supplied with a voltage according to the content temporarily stored in the buffer register 32.
  • the timing pulses TA, TS and TB and the video signal of one horizontal scanning line is written in parallel to display a TV picture of 16 gradations.
  • the aforementioned receiver 18 corresponds to a typical television receiver including a deflection circuit and the other circuits required for providing a display on a cathode ray tube.
  • the A/D converter 28, the shift register 30, the buffer register 32, etc. may be selected from those types well-known in the art.
  • the gate circuit 24 is made up of AND gates Gxall to GxbnZ and OR gates GRal to GRbn, as shown in FIG. 7, from which are derived outputs ml to xbn' in accordance with brightness level signals 1, 2, 4 and 8 stored in the buffer register 32 and the timing signals TS, TA and TB. While the gate circuit 26 is formed with AND gates Gyal to Gybm, as depicted in FIG. 8, from which are derived outputs yal' to ybm' in accordance with outputs l to m from the counter-decoder 22 and the timing pulses TA and TB.
  • timing pulses TS, TA and TB bear a relationship as shown in FIG. 9 and writing in the discharge cells of the brightness levels I and 2 is achieved with the timing pulse TA between instants [I and t2 and writing in the discharge cells of the brightness levels 4 and 8 is effected with timing pulse TB between the instants t2 and :3.
  • the sustain voltage source 12 has a construction as illustrated in FIGS. 10 or 1 1, and FIG. 12 shows a series of waveform diagrams for explaining the operation of the sustain voltage source 12.
  • a pulse A1 a transistor OX1 is turned on to produce a voltage +Vs in outputs xal to xan, which is applied to the electrodes of the plasma display panel 10.
  • capacitors are formed between the opposing electrodes, so that a transistor OX2 is turned on by a pulse A2 to discharge the capacitors. Accordingly, the outputs xal to xan become of such a voltage Vxa as depicted in FIG. 12.
  • transistors OX3 and OX4 are turned on by pulses B1 and B2, respectively, so that the outputs xbl to xbn become of such a voltage Vxb as shown in FIG. 12.
  • transistors OYI and OY2 are turned on by pulses C l and C2, respectively, and outputs yal to yam become of such a voltage Vya as depicted in FIG. 12, and transistors OY3 and OY4 are turned on by pulses D1 and D2, respectively, so that outputs ybl to ybrr'z become of such a voltage Vyb as shown in FIG. 12. Namely, the sustain voltage described previously with regard to FIG. 1 is obtained.
  • FIG. 13 is a diagram, for explaining one example of the plasma display panel 10, in which electrodes x1 I to 1012 and yll to ym2 form pairs and four discharge cells formed at the intersecting points of two pairs of the electrodes constitute one picture element 40.
  • Numerals l, 2, 4 and 8 in circles represent the brightness levels of the respective discharge cells.
  • the driver 34 is formed of transistors Oxal to Oxbm, as illustrated in FIG. 14, and the outputs ml to .rbn' from the gate circuit 24 are applied to the bases of the transistors Oxal to Oxbn to provide outputs Dxul to Dxbn of a voltage +VW.
  • the outputs Dxal to Dxbn are applied to the mixing circuit I4 together with the signals ml to .rbn from the sustain voltage source 12.
  • the mixing circuit 14 has a construction as shown in FIG. 15, comprised of a plurality of resistive elements Rl to Rn and its output is applied to the electrodes .rll to .rn2 of the plasma display panel I0.
  • the driver 36 comprises transistors Oyal to Oybm as depicted in FIG. 16, and the outputs ya! to ybm' from the gate circuit 26 are impressed to the bases of the transistors Qyal to Oybm to provide outputs Dyal to Dybm of a voltage VW.
  • the outputs Dyal to Dybm are applied to the mixing circuit 16 together with those signals yal to ybm from the sustain voltage source I2.
  • the mixing circuit 16 is of such a construction as shown in FIG. 17 comprising resistors R'l to R'm, and its output is applied to the electrodes yll to ym2 of the plasma display panel 10.
  • the sustain voltage is impressed to the discharge cells forming picture elements so that their brightness levels may be different from one another and the discharge cells are selected in accordance with the video signal and writing is achieved, thus displaying a TV picture having tone gradations.
  • the electrodes (yll, yl2), (y2l, y22), (yml, ymZ) are scanned sequentially for writing. It is also possible to improve picture quality by effecting the first scanning in the manner described above and subsequently scanning the electrodes (y12, y21),(y22,y31), .y(ml)2,(yml) in pairs.
  • the capacity of the buffer register increases, so that by dividing the horizontal scanning line into a plurality of sections, the capacity of the buffer register can be reduced down to a fraction of the number of the divided sections.
  • one picture element is formed with a plurality of cells, the numbers of times of discharge radiation of the respective cells are made different from one another to make the brightness levels of the cells different from one another and a plurality of gradations can be obtained by the combination of the respective cells, as has been described in the foregoing. It is also possible that the peak values and pulse widths of the impression voltages therefor are made equal to one another only by selecting them in different phases and at different repetitive frequencies and that only their phases and pulse widths are selected different from one another. Therefore, the sustain voltage circuit can be simplified. Further, if no memory function due to the wall voltage is employed, the impression voltages can be regularly displaced apart in-phase. In the foregoing examples, l6 gradations are obtained with four cells, but if each picture element is made up of six, eight or more cells, 32, 64 or more gradations can be obtained, respectively.
  • the cell herein mentioned is a single discharge region formed at each intersecting point of the electrodes and adjoining discharge regions need not be mechanically isolated from each other.
  • a brightness modulation system for producing an image display with selectively controlled brightness level gradations on a plasma display device, said plasma display device having a plurality of X electrodes and a plurality of Y electrodes disposed to intersect each other with a discharge gas spaced therebetween whereby a plurality of discharge cells is formed at the intersections of the X and Y electrodes, the successive, adjacent electrodes of at least one of said pluralities of X and Y electrodes being arranged in groups and the electrodes of each such group defining corresponding combinations of discharge cells at the intersections thereof with the electrodes of the other of said pluralities of X and Y electrodes, each said combination of discharge cells comprising a display element of the said image display, the corresponding cells of each said combination being selectively and individually controllable to undergo respective.
  • different and predeter mined rates of discharge to produce corresponding, different individual brightness levels thereby to provide selective gradations of the brightness level of the display element formed by each such combination of discharge cells
  • said brightness modulation system comprising:
  • said sustaining means sustaining discharges in those cells of each said combination in which discharges are selectively established by said means for selectively establishing discharges in accordance with the said predetermined different rates of discharges Sustained by the respective, different sustain signals. thereby to sustain the gradation of brightness level for each said display element as indicated by said indicating means.
  • a brightness modulation system as recited in claim 1 wherein the successive, adjacent electrodes of each of said pluralities of X and Y electrodes are arranged in groups, the intersections of the electrodes of a group of one of said pluralities ofX and Y electrodes with the electrodes of a group of the other of said pluralities of X and Y electrodes defining a corresponding combina tion of discharge cells comprising a display element of the said image display.
  • each said group of X electrodes and each said group of Y electrodes includes n electrodes, defining thereby n discharge cells in the corresponding combination of discharge cells defined by the intcrsections of the electrodes of each said group of X electrodes with the electrodes of each said group of Y electrodes. whereby the number of brightness level gradations of each display element is 2".
  • a brightness modulation system as recited in claim 2 wherein said sustain signal providing means provides sustain signals of different repetitive frequencies to the electrodes of each of said group of X electrodes and said group ofY electrodes associated with a given combination of discharge cells, for all said combinations. whereby each discharge cell of each said combination defined by each group of one of said X and Y electrodes with a group of the other of said X and Y electrodes sustains a discharge at a different rate than the other discharge cells of that said combination.
  • a brightness modulation system as recited in claim 2 wherein said brightness level gradation indicating means comprises:
  • said selecting means is responsive to said digital signals for selectively establishing discharges in the cells of each said combination thereof in accordance with the brightness level gradations indicated by the digital signals for the respectively corresponding image display element.
  • a brightness modulation system as claimed in claim 2 for use with a television receiver receiving transmitted video signals and providing a corresponding analog picture signal defining brightness levels of a picture to be displayed, wherein said brightness level gradation indicating means comprises analog-to-digital converter means for converting the amplitude levels of said analog picture signal into corresponding digital sig nals, and said selecting means is responsive to said digital picture signals for selectively establishing discharges in the cells of each said combination thereof corresponding to each display element of the picture to be 9 displayed, whereby an image display with brightness level gradations is provided.
  • a brightness modulation system for producing an image display with selectively controlled brightness level gradations on a plasma display device, said display device having a plurality of X electrodes and a plurality of Y electrodes disposed to intersect each other with a discharge gas spaced therebetween whereby a plurality of discharge cells is formed at the intersections of the X and Y electrodes, the successive, adjacent electrodes of each of said pluralities of X and Y electrodes being arranged in groups, and the intersections of the electrodes of each such group of one of said pluralities of X and Y electrodes with the electrodes of each such group of the other of said pluralities of X and Y electrodes defining corresponding combinations of discharge cells, each said combination of discharge cells comprising a display element of the said image display, the cells of each said combination being selectively and individually controllable to undergo respective, different and predetermined rates of discharge to produce corresponding, different and predetermined brightness levels thereby to provide selective gradations of the brightness level of the display element formed by each such combination of display cells, said brightness
  • means providing at least a second set of energizing signals of respectively different repetition rates, the signals of said second set being in phase with the signals of said first set, and being equal in number to the number of electrodes of each of said group of electrodes of the other of said pluralities of X and Y electrodes.
  • a brightness modulation system as recited in claim 8 wherein said providing means provides a third set of energizing signals of respectively different repetition rates, each signal of said third set being in phase with one of said signals of said first set, and
  • said applying means selects between the signals of said second and third sets for supply of the selected set of signals to the electrodes of each group of the other of said pluralities of X and Y electrodes to establish, selectively, discharges in the respectively corresponding discharge cells of the corresponding combinations thereof for producing respectively corresponding brightness level gradations in the associated picture elements of the display,
  • each of said first, second and third sets of energizing signals comprises two energizing signals differing as aforesaid. the signals of said second set being in phase with a first of said signals of said first set and the signals of said third set being in phase with the second of said signals of said first set.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
US319941A 1971-12-30 1972-12-29 Brightness modulation system for a plasma display device Expired - Lifetime US3886403A (en)

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JP (1) JPS5238693B2 (en, 2012)
DE (1) DE2264175B2 (en, 2012)
GB (1) GB1423368A (en, 2012)
NL (1) NL183070C (en, 2012)

Cited By (20)

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US4009335A (en) * 1973-08-09 1977-02-22 Stewart-Warner Corporation Gray scale display system employing digital encoding
DE3015887A1 (de) * 1979-04-25 1980-11-06 Hitachi Ltd Serien-parallel-signalumsetzer
US4297691A (en) * 1978-08-30 1981-10-27 Hitachi, Ltd. Figure displaying device
US4323896A (en) * 1980-11-13 1982-04-06 Stewart-Warner Corporation High resolution video display system
US4344622A (en) * 1978-06-16 1982-08-17 Rockwell International Corporation Display apparatus for electronic games
DE3110613A1 (de) * 1981-03-04 1982-09-30 United Technologies Corp., 06101 Hartford, Conn. Schaltungsanordnung zum erzeugen von grauaenderungen in einer plasmatafel
DE3049666C2 (de) * 1979-04-25 1983-12-08 Hitachi Ltd Zeilenspeicher
WO1984003577A1 (en) * 1983-03-01 1984-09-13 Tadeusz Bobak Display device
US4622549A (en) * 1983-06-29 1986-11-11 International Business Machines Corporation Repetition rate compensation and mixing in a plasma panel
US4644342A (en) * 1984-03-29 1987-02-17 Eastman Kodak Company Array of light emitting diodes for producing gray scale light images
US4661809A (en) * 1982-05-05 1987-04-28 Litton Systems, Inc. Magneto-optic chip with gray-scale capability
US4779083A (en) * 1985-03-08 1988-10-18 Ascii Corporation Display control system
US4843627A (en) * 1986-08-05 1989-06-27 Stebbins Russell T Circuit and method for providing a light energy response to an event in real time
EP0260146A3 (en) * 1986-09-12 1990-05-09 International Business Machines Corporation Multi-colour display system
EP0261898A3 (en) * 1986-09-20 1990-05-30 Thorn Emi Plc Display device
US5266940A (en) * 1988-03-05 1993-11-30 Sharp Kabushiki Kaisha Method of gray scale display for dot matrix type display device
US5541618A (en) * 1990-11-28 1996-07-30 Fujitsu Limited Method and a circuit for gradationally driving a flat display device
US6097357A (en) * 1990-11-28 2000-08-01 Fujitsu Limited Full color surface discharge type plasma display device
US6787995B1 (en) 1992-01-28 2004-09-07 Fujitsu Limited Full color surface discharge type plasma display device
US20050253825A1 (en) * 2004-05-11 2005-11-17 Hitachi, Ltd. Video display apparatus

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JPS4996625A (en, 2012) * 1973-01-16 1974-09-12
JPS5234918B2 (en, 2012) * 1974-05-31 1977-09-06
JPS5320725A (en) * 1976-08-10 1978-02-25 Nec Corp Luminance modulation system for plasma display
JPS546421A (en) 1977-06-16 1979-01-18 Sony Corp Picture display unit
IT1226777B (it) * 1987-02-12 1991-02-07 Compaq Computer Corp Visualizzatore migliorato a plasma gassoso con rollore di scintillamento
JP2784005B2 (ja) * 1988-03-05 1998-08-06 シャープ株式会社 表示装置の階調表示方式

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US3627924A (en) * 1969-05-16 1971-12-14 Energy Conversion Devices Inc Flat screen television system
US3603731A (en) * 1969-08-27 1971-09-07 Paul K Weimer Digital scanning mosaic photosensing system
US3665455A (en) * 1970-09-01 1972-05-23 Owens Illinois Inc Binary addressable magnetically multiplex discharge manipulation system for multiple gaseous discharge display/memory panel

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009335A (en) * 1973-08-09 1977-02-22 Stewart-Warner Corporation Gray scale display system employing digital encoding
US4344622A (en) * 1978-06-16 1982-08-17 Rockwell International Corporation Display apparatus for electronic games
US4297691A (en) * 1978-08-30 1981-10-27 Hitachi, Ltd. Figure displaying device
DE3049666C2 (de) * 1979-04-25 1983-12-08 Hitachi Ltd Zeilenspeicher
DE3015887A1 (de) * 1979-04-25 1980-11-06 Hitachi Ltd Serien-parallel-signalumsetzer
US4323896A (en) * 1980-11-13 1982-04-06 Stewart-Warner Corporation High resolution video display system
DE3110613A1 (de) * 1981-03-04 1982-09-30 United Technologies Corp., 06101 Hartford, Conn. Schaltungsanordnung zum erzeugen von grauaenderungen in einer plasmatafel
US4661809A (en) * 1982-05-05 1987-04-28 Litton Systems, Inc. Magneto-optic chip with gray-scale capability
WO1984003577A1 (en) * 1983-03-01 1984-09-13 Tadeusz Bobak Display device
US4791417A (en) * 1983-03-01 1988-12-13 Tadeusz Bobak Display device
US4622549A (en) * 1983-06-29 1986-11-11 International Business Machines Corporation Repetition rate compensation and mixing in a plasma panel
US4644342A (en) * 1984-03-29 1987-02-17 Eastman Kodak Company Array of light emitting diodes for producing gray scale light images
US4779083A (en) * 1985-03-08 1988-10-18 Ascii Corporation Display control system
US4843627A (en) * 1986-08-05 1989-06-27 Stebbins Russell T Circuit and method for providing a light energy response to an event in real time
EP0260146A3 (en) * 1986-09-12 1990-05-09 International Business Machines Corporation Multi-colour display system
US5124695A (en) * 1986-09-20 1992-06-23 Thorn Emi Plc Display device
EP0261898A3 (en) * 1986-09-20 1990-05-30 Thorn Emi Plc Display device
US5266940A (en) * 1988-03-05 1993-11-30 Sharp Kabushiki Kaisha Method of gray scale display for dot matrix type display device
US5541618A (en) * 1990-11-28 1996-07-30 Fujitsu Limited Method and a circuit for gradationally driving a flat display device
US5724054A (en) * 1990-11-28 1998-03-03 Fujitsu Limited Method and a circuit for gradationally driving a flat display device
US6097357A (en) * 1990-11-28 2000-08-01 Fujitsu Limited Full color surface discharge type plasma display device
US6630916B1 (en) 1990-11-28 2003-10-07 Fujitsu Limited Method and a circuit for gradationally driving a flat display device
US20040222948A1 (en) * 1992-01-28 2004-11-11 Fujitsu Limited Full color surface discharge type plasma display device
US20040178730A1 (en) * 1992-01-28 2004-09-16 Fujitsu Limited Full color surface discharge type plasma display device
US6787995B1 (en) 1992-01-28 2004-09-07 Fujitsu Limited Full color surface discharge type plasma display device
US6838824B2 (en) 1992-01-28 2005-01-04 Fujitsu Limited Full color surface discharge type plasma display device
US20050001550A1 (en) * 1992-01-28 2005-01-06 Fujitsu Limited Full color surface discharge type plasma display device
US6861803B1 (en) 1992-01-28 2005-03-01 Fujitsu Limited Full color surface discharge type plasma display device
US7030563B2 (en) 1992-01-28 2006-04-18 Hitachi, Ltd. Full color surface discharge type plasma display device
US20060182876A1 (en) * 1992-01-28 2006-08-17 Hitachi, Ltd. Full color surface discharge type plasma display device
US20060202620A1 (en) * 1992-01-28 2006-09-14 Hitachi, Ltd. Full color surface discharge type plasma display device
US7133007B2 (en) 1992-01-28 2006-11-07 Hitachi, Ltd. Full color surface discharge type plasma display device
US7208877B2 (en) 1992-01-28 2007-04-24 Hitachi, Ltd. Full color surface discharge type plasma display device
US7825596B2 (en) 1992-01-28 2010-11-02 Hitachi Plasma Patent Licensing Co., Ltd. Full color surface discharge type plasma display device
US20050253825A1 (en) * 2004-05-11 2005-11-17 Hitachi, Ltd. Video display apparatus

Also Published As

Publication number Publication date
DE2264175C3 (en, 2012) 1975-04-03
DE2264175A1 (de) 1973-07-12
DE2264175B2 (de) 1974-08-08
NL7217851A (en, 2012) 1973-07-03
NL183070B (nl) 1988-02-01
JPS5238693B2 (en, 2012) 1977-09-30
GB1423368A (en) 1976-02-04
NL183070C (nl) 1988-07-01
JPS4874734A (en, 2012) 1973-10-08

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