Claims
- 1. A drive system for a thin-film electroluminescent (EL) matrix display panel comprising:
- data side electrodes formed on one major surface of the thin-film electroluminescent (EL) matrix display panel and generally extending in a first direction;
- scanning side electrodes formed on the opposing major surface of said thin-film electroluminescent (EL) matrix display panel in a second direction substantially perpendicular to said first direction, said scanning side electrodes being alternately divided into odd number scanning electrodes and even number scanning electrodes;
- a pull-up charge driving circuit;
- a precharge driving circuit;
- a write driving circuit for providing first and second write pulses;
- a source level switching circuit;
- an odd side first N or P type channel high voltage MOS driver connected to said odd number scanning electrodes at one end thereof, the other end of said odd side first type channel high voltage MOS driver being connected to said source level switching circuit;
- an odd side second type channel different from said first type channel high voltage MOS driver connected to said odd number scanning electrodes at one end thereof, the other end of said odd side second type channel high voltage MOS driver being connected to said pull-up charge driving circuit and said write driving circuit;
- an even side first type channel high voltage MOS driver connected to said even number scanning electrodes at one end thereof, the other end of said even side first type channel high voltage MOS driver being connected to said source level switching circuit;
- an even side second type channel high voltage MOS driver connected to said even number scanning electrodes at one end thereof, the other end of said even side second type channel high voltage MOS driver being connected to said pull-up charge driving circuit and said write driving circuit; and
- a data side high voltage MOS driver connected to said data side electrodes at one end thereof, the other end of said data side high voltage MOS driver being connected to said precharge driving circuit;
- said odd side second type channel MOS driver directing said first write pulse to said odd number scanning electrodes when an even number scanning electrode is selected in a first driving field and directing said second write pulse to a selected odd number scanning electrode when in a second driving field;
- said even side second type channel MOS driver directing said first write pulse to said even number scanning electrodes when an odd number scanning electrode is selected in said first driving field and directing said second write pulse to a selected even number scanning electrode in said second driving field;
- said first write pulse supplied to each said scanning electrode being provided with a polarity opposite to said second write pulse supplied to that same said scanning electrode with a constant phase relationship therebetween for all said scanning electrodes.
- 2. The drive system for a thin-film electroluminescent (EL) matrix display panel of claim 1, further comprising a diode array disposed between said data side high voltage MOS driver and said precharge driving circuit.
- 3. The drive system of claim 1 wherein said first type high voltage MOS drivers are pull down type divers and said second type high voltage MOS drivers are pull up type drivers.
- 4. A drive system for a thin-film electroluminescent (EL) matrix display panel of claim 2, further comprising:
- first means for conducting said first field driving, said first means including;
- first activating means for turning on one of a plurality of MOS transistors included in said odd side first type channel high voltage MOS driver; and
- second activating means for turning on all of a plurality of MOS transistors included in said even side second type channel high voltage MOS driver; second means for conducting the first field driving, said second means including:
- third activating means for turning on one of a plurality of MOS transistors included in said even side first type channel high voltage MOS driver; and
- fourth activating means for turning on all of a plurality of MOS transistors included in said odd side second type channel high voltage MOS driver;
- first switching means for switching said source level switching circuit so that the source voltage is maintained at the ground level in said first field driving;
- third means for conducting said second field driving, said third means including:
- fifth activating means for turning on one of said plurality of MOS transistors included in said odd side second type channel high voltage MOS driver; and
- sixth activating means for turning on all of the plurality of MOS transistors included in said even side first type channel high voltage MOS driver;
- fourth means for conducting the second field driving, said fourth means including:
- seventh activating means for turning on one of said plurality of MOS transistors included in said even side second type channel high voltage MOS driver; and
- eighth activating means for turning on all of the plurality of MOS transistors included in said odd side first type channel high voltage MOS driver; and
- second switching means for switching said source level switching circuit so that the source voltage is maintained at a pull-up charge level in said second field driving.
- 5. A drive system for a thin-film electroluminescent (EL) matrix display panel comprising:
- data side electrodes formed on one major surface of the thin-film electroluminescent (EL) matrix display panel generally in a first direction;
- scanning side electrodes formed on the opposing major surface of said thin-film electroluminescent (EL) matrix display panel in a second direction substantially perpendicular to said first direction, said scanning side electrodes being alternately divided into odd number scanning electrodes and even number scanning electrodes;
- a pull-up charge driving circuit;
- a precharge driving circuit;
- a write/refresh driving circuit for providing a first write pulse, a second write pulse, and a refresh pulse;
- a data side refresh driving circuit;
- a source level switching circuit;
- an odd side first N or P type channel high voltage MOS driver connected to said odd number scanning electrodes at one end thereof, the other end of said odd side first type channel high voltage MOS driver being connected to said source level switching circuit;
- an odd side second type channel different from said first type channel high voltage MOS driver connected to said odd number scanning electrodes at one end thereof, the other end of said odd side second type channel high voltage MOS driver being connected to said pull-up charge driving circuit and said write/refresh driving circuit;
- an even side first type channel high voltage MOS driver connected to said even number scanning electrodes at one end thereof, the other end of said even side first type channel high voltage MOS driver being connected to said source level switching circuit;
- an even side second type channel high voltage MOS driver connected to said even number scanning electrodes at one end thereof, the other end of said even side second type channel high voltage MOS driver being connected to said pull-up charge driving circuit and said write/refresh driving circuit;
- a data side high voltage MOS driver connected to said data side electrodes at one end thereof, the other end of said data side high voltage MOS driver being connected to said precharge driving circuit and said data side refresh driving circuit;
- said odd side second type channel MOS driver directing said first write pulse to said odd number scanning electrodes when an even number scanning electrode is selected in a first driving field and directing said second write pulse to a selected odd number scanning electrode when in a second driving field;
- said even side second type channel MOS driver directing said first write pulse to said even number scanning electrodes when an odd number scanning electrode is selected in said first driving field and directing said second write pulse to a selected even number scanning electrode in said second driving field;
- said first write pulse provided to each said scanning electrode being of a polarity opposite to said second write pulse provided to that same said scanning electrode with a constant phase difference therebetween for all said scanning electrodes.
- 6. The drive system for a thin-film electroluminescent (EL) matrix display panel of claim 4, further comprising a diode array disposed between said data side high voltage MOS driver and said precharge driving circuit and said data side refresh driving circuit.
- 7. The drive system of claim 4 wherein said first type high voltage MOS drivers are pull down type drivers and said second type high voltage MOS drivers are pull up type drivers.
- 8. The drive system for a thin-film electroluminescent (EL) matrix display panel of claim 6, further comprising:
- first means for conducting said first field driving, said first means including:
- first activating means for turning on one of a plurality of MOS transistors included in said odd side first type channel high voltage MOS driver; and
- second activating means for turning on all of a plurality of MOS transistors included in said even side second type channel high voltage MOS driver;
- second means for conducting the first field driving, said second means including:
- third activating means for turning on one of a plurality of MOS transistors included in said even side first type channel high voltage MOS driver; and
- fourth activating means for turning on all of a plurality of MOS transistors included in said odd side second type channel high voltage MOS driver;
- first switching means for switching said source level switching circuit so that the source voltage is maintained at the ground level in said first field driving;
- first refresh control means for turning on all of a plurality of MOS transistors included in said data side first type channel high voltage MOS driver and all of the plurality of MOS transistors included in said odd side and even side first type channel high voltage MOS drivers;
- third means for conducting said second field driving, said third means including:
- fifth activating means for turning on one of the plurality of MOS transistors included in said odd side second type channel high voltage MOS driver; and
- sixth activating means for turning on all of a plurality of MOS transistors included in said even side first type channel high voltage MOS driver;
- fourth means for conducting the second field driving, said fourth means including:
- seventh activating means for turning on one of the plurality of MOS transistors included in said even side second type channel high voltage MOS driver; and
- eighth activating means for turning on all of the plurality of MOS transistors included in said odd side first type channel high voltage MOS driver;
- second switching means for switching said source level switching circuit so that the source voltage is maintained at a pull-up charge level in said second field driving; and
- second refresh control means for turning off all of the plurality of MOS transistors included in said data side high voltage driver, and for turning on all of the plurality of MOS transistors included in said odd side and even side first type channel high voltage MOS drivers.
- 9. A method of driving an electroluminescent matrix display panel having a plurality of pixels defined by data electrodes and scanning electrodes, said scanning electrodes being arranged in alternating even and odd groups comprising the steps of:
- (a) precharging all said pixels with a precharge voltage;
- (b) selecting data electrodes to be driven and discharging all said pixels associated with data electrodes not selected while applying a pull-up voltage to leave only those pixels associated with the selected data electrode charged;
- (c) applying a first writing pulse of a first polarity to said pixels associated with a selected scanning electrode and said selected data electrodes by applying a voltage directly to the other of said even and odd groups to which said selected scanning electrode is associated, said selected scanning electrode being held to a ground level, said applied voltage pulling up said other group of scanning electrodes to form said first writing pulse when superimposed on said precharge voltage to initiate electroluminescence of said pixels associated with said selected scanning and data electrodes;
- said steps of (a) precharging, (b) discharging, and (c) applying being performed for each scanning electrode;
- (d) applying a refresh pulse of a second polarity opposite to the polarity of said first writing pulse to all said pixels;
- (e) subsequently applying a refresh pulse of said first polarity to all said pixels;
- (f) precharging all said pixels with a precharge voltage;
- (g) selecting data electrodes to be driven and discharging all said pixels associated with the selected data electrode while applying a pull-up voltage to leave only those pixels charged which are associated with data electrodes not selected;
- (h) applying a second writing pulse of said second polarity to said pixels associated with a selected scanning electrode and said selected data electrodes by applying a voltage directly to said selected scanning electrode while applying a source level voltage to the other of said even and odd groups to which said selected scanning electrode is not associated, said applied voltage pulling down said data electrodes and developing a net voltage across said pixels associated with said selected scanning and data electrodes to cause electroluminescence;
- said steps of (f) precharging, (g) discharging, and (h) applying being performed for each scanning electrode;
- (i) applying a refresh pulse of said first polarity to all said pixels;
- (j) applying a refresh pulse of said second polarity to all said pixels.
- 10. A method of driving an electroluminescent matrix display panel having a plurality of pixels arranged in odd and even groups and defined by data electrodes and scanning electrodes, said scanning electrodes being arranged in alternating even and odd groups, selected ones of said pixels forming a display image on said display panel, comprising:
- driving each said selected pixel by applying drive signals divided into odd and even fields to the said electrodes defining a said selected pixel by;
- (a) driving the said pixels in said odd field by,
- applying a first precharge voltage to all said scanning electrodes in said odd group,
- discharging each nonselected pixel not selected for display thereon and pulling said net voltage across said pixel to a pull up voltage of opposite polarity to said first precharge voltage, and
- supplying a first write voltage to all said pixels, selected said pixels receiving a voltage sum of said first precharge voltage and first write voltage so as to cause luminescence thereof, nonselected said pixels receiving a voltage sum of said first write voltage and said first pull up voltage which is insufficient to cause luminescence, and
- (b) driving said pixels in said even field by,
- applying a second precharge voltage to all said scanning electrodes in said odd group,
- discharging each nonselected pixel not selected for display thereon and pulling said net voltage across said pixel to a second pull up voltage of opposite polarity to said second precharge voltage, and
- supplying a second write voltage to all said pixels, selected said pixels receiving a voltage sum of said second precharge voltage and second write voltage so as to cause luminescence thereof, nonselected said pixels receiving a voltage sum of said second write voltage and said second pull up voltage which is insufficient to cause luminescence,
- said first and second precharge, pull up and write voltages each having opposite respective polarities;
- said steps (a) and (b) of driving applying to all said scanning electrodes a said write pulse in said odd field and a said write pulse in said even field with a constant phase relationship therebetween.
- 11. The method of claim 10 wherein said step (a) of driving in said odd field applies a first refresh signal to each said pixel;
- said step (b) of driving in said even field applies a second refresh signal having a polarity opposite said first refresh signal to each said pixel.
- 12. The method of claim 11 wherein each of said first and second refresh signals includes first and second refresh pulses having opposite polarities.
- 13. A system for driving an electroluminescent matrix display panel having a plurality of pixels arranged in odd and even groups and defined by data electrodes and scanning electrodes, said scanning electrodes being arranged in alternating even and odd groups, selected ones of said pixels forming a display image on said display panel; said system applying drive signals to each said selected pixel, said drive signals being divided into odd and even fields and being supplied to the said electrodes defining a said selected pixel, said system comprising:
- first means for driving the said pixels in said odd field by,
- applying a first precharge voltage to all said scanning electrodes in said odd group,
- discharging each nonselected pixel not selected for display thereon and pulling said net voltage across said pixel to a first pull up voltage of opposite polarity to said first precharge voltage, and
- supplying a first write voltage to all said pixels, selected said pixels receiving a voltage sum of said first precharge voltage and first write voltage so as to cause luminescence thereof, nonselected said pixels receiving a voltage sum of said first write voltage and said first pull up voltage which is insufficient to cause luminescence; and second means for driving said pixels in said even field by,
- applying a second precharge voltage to all said scanning electrodes in said odd group,
- discharging each nonselected pixel not selected for display thereon and pulling said net voltage across said pixel to a second pull up voltage of opposite polarity to said second precharge voltage, and
- supplying a second write voltage to all said pixels, selected said pixels receiving a voltage sum of said second precharge voltage and second write voltage so as to cause luminescence thereof, nonselected said pixels receiving a voltage sum of said second write voltage and said second pull up voltage which is insufficient to cause luminescence,
- said first and second precharge, pull up and write voltage supplied by said first and second drive means each having opposite respective polarities;
- said first and second means for driving applying to all said scanning electrodes a said write pulse in said odd field and a said write pulse in said even field with a constant phase relationship therebetween.
- 14. The system of claim 13 wherein said first means for driving in said odd field applies a first refresh signal to each said pixel;
- said second means for driving in said even field applies a second refresh signal having a polarity opposite said first refresh signal to each said pixel.
- 15. The system of claim 14 wherein each of said first and second refresh signals includes first and second refresh pulses haivng opposite polarities.
Priority Claims (2)
Number |
Date |
Country |
Kind |
59-66166 |
Apr 1984 |
JPX |
|
59-73621 |
Apr 1984 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 718,239 filed on Apr. 1, 1985, now abandoned.
US Referenced Citations (4)
Non-Patent Literature Citations (1)
Entry |
Nikkei Electronics, Apr. 2, 1979, "Practical Applications of Thin-Film Electroluminescent (EL) Character Display". |
Continuations (1)
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Number |
Date |
Country |
Parent |
718239 |
Apr 1985 |
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