Method and device using electron beam to scan for matrix panel display

• US 5,504,497 A
• Filed: 04/18/1994
• Issued: 04/02/1996
• Est. Priority Date: 04/18/1994
• Status: Expired due to Term

• Current Assignee: Li, Weicheng
• Original Assignee: Li, Weicheng
• Inventors: Li, Weicheng
• Primary Examiner(s): Chin, Tommy P.
• Assistant Examiner(s): GOON, GIN F
• Application Number:
  US08/228,816
• Time in Patent Office: 715 Days
• Field of Search: 345/60-64, 345/74, 345/80, 345/81, 345/104, 345/207, 315/169.4
• US Class Current: 345/60
• CPC Class Codes: H01J 31/124 using electron beam scanning

Abstract

A new scanning method and device for matrix panel display for using electron beam to scan comprising the steps: connecting each anode of dc matrix display panel to the display supply'"'"'s anode via a switch cell whose status is controlled by electron beam, using one electron beam to irradiate to some anode; using another electron beam to irradiate to some cathode of the display panel; thereby selecting the unique display cell at the intersection of anode and cathode to light up; deflecting both beams accordingly to implement two-dimensional addressing; and adjusting beam current of the irradiating cathode to achieve image gray scale adjustment. The device using electron beam to scan for plasma matrix panel display, comprising a direct-current plasma display panel a plurality of display discharging cells formed at the intersections of the anodes and cathodes and switch cells formed at the intersections of the anodes and collection electrodes; two electron beam scanning, each comprising an electrode-any target screen where target electrodes are connected to display panel'"'"'s anodes and cathodes, display supply whose output voltage is greater or equal to than the sum of the breakdown voltage of display discharging cell and the ionizing voltage of switch cell; and delay-circuit for longer pixel duty cycle. One electron beam seems anodes and closes the related switch cells to link display supply; another electron beam scans cathodes to make a unique moving display cell to emit light so as to realize two dimensional scanning and display.

Claims

1. A method using electron beam to scan for dc matrix panel display comprising the steps of:

supplying an electrical supply having anode and cathode to the dc matrix display panel, connecting each anode of matrix display panel to the display supply'"'"'s anode via an anode switch cell whose on-off status is controlled by a scanning electron beam which changes the voltage between said matrix anode and said display supply'"'"'s anode;

each said anode switch cell is a part of one whole which can only make of uniform material with switching characteristic;

scanning an only supplying controlling circuit to said anode switch cell electron X-beam to irradiate to coupling matrix anode control pin of some said anode switch cell to turn-on said anode switch cell to render said matrix anode conducting to with said display supply'"'"'s anode through turned-on said anode switch cell;

scanning a supplying emitting-light circuit which variation according to pixel value of the image to be shown to every display cell of said display panel electron Y-beam to irradiate to some cathode of said matrix display panel to render said matrix cathode conducting to said display supply'"'"'s cathode directly through said Y-beam;

thereby selecting unique display cell at which said matrix anode and said matrix cathode intersect to form a driving display cell loop, thus emit light;

said loop is from the display supply'"'"'s anode--anode switch cell--matrix anode--display cell--matrix cathode--Y-beam--electron gun shooting Y-beam--the display supply'"'"'s cathode;

deflecting the X-beam and Y-beam accordingly with electrical and magnetic field defecting means to implement two-dimensional matrix scanning of said display panel in the way of space-shifting, wherein the shift process from one of said anodes or cathodes of said matrix display panel to another only depends on the change of the space position onto where said some electron beam is deflected

in the above process, simultaneously controlling the circuit intensity of said Y-beam according to pixel value of the image to be shown, thereby to adjust the brightness of the image pixels to achieve displaying of said image.

2. A device using electron beam to scan for plasma matrix display panel comprising

direct-current plasma display panel means comprising display discharging cells formed at the space-orthogonal intersections of the matrix anodes and the matrix cathodes, switch discharging cells each of which is a pan of one whole which can be only made of uniform plasma material with switching characteristic formed at the space-orthogonal intersections of said matrix anodes and the collation electrode that parallel with said matrix cathodes and vertical with said matrix anodes;

X direction scanning electron beam means is an electron beam means with the electrode-array target screen, each target electrode in said target screen of X-scanning means being connected to a said matrix anode one by one;

Y direction scanning electron beam means is an electron beam means with the electrode-array target screen, each target electrode in said target screen of Y-scanning means being connected to a said matrix cathode one-by-one;

dc display supply whose output voltage is greater than or equal to the sum of the breakdown voltage of said display discharging cell and the ionizing voltage of said switch cell;

said display supply'"'"'s anode is connected to said collection electrode of said display panel means;

whereby letting said X-scanning means emit electron X-beam to some said target electrode of X-scanning means, to make the potential of said matrix anode which connects to this said target electrode of X-scanning means decreasing down through being charged until said switch cell linking this said matrix anode is on, thereby this said matrix anode is passed through to said display supply'"'"'s anode;

letting said of Y-scanning means emit electron Y-beam to some said target electrode of Y-scanning means, to make the potential of said matrix cathode which connects to this said target electrode of Y-scanning means decreasing down through being charged until the display discharging cell at the intersection of said matrix cathode and said matrix anode that is already conducted to said display supply'"'"'s anode is breakdown, thereby said display discharging cell emits light;

deflecting said X-beam and said Y-beam accordingly to implement two-dimensional matrix scanning of said display panel in the way of space-shifting, wherein the shift process from one of said anodes or cathodes of said matrix display panel to another only depends on the change of the space position onto where said some electron beam is deflected

in the above process, simultaneously controlling the circuit intensity, of said Y-beam according to pixel value of the image to be shown, thereby to adjust the brightness the pixels of said image to achieve displaying of said image without separate handling, transferring and driving means of said image signal that respectively match the some display cells.

3. The display device as claimed in claim 2, wherein the ionizing voltage of said switch cell after its breakdown is designed to be as much smaller than the ionizing voltage of said display discharging cell.

4. The display device as claimed in claim 2, wherein said switch cell is designed to have capability to work under a much larger current than said display discharging cell.

5. The display device as claimed in claim 2, wherein said switch cell is designed to have as small dynamic resistance value as possible.

6. The display device as claimed in claim 2 wherein said anode selected by said X-gun bas to be conducting before said cathode selected by said Y-gun is conducting when scanning starts.

7. The display device as claimed in claim 2, wherein said Y-gun is designed to offer sufficient beam current to adjust gray scale of pixels.

8. A device using electron beam to scan and adding delay-circuit means for plasma panel display comprising

direct-current plasma display panel means comprising transparent anodes partitioned into two sets, either said set containing every other anode corresponding to a collection electrode, display discharging cells formed at the space-orthogonal intersections of said anodes and cathodes, phosphor units attached to said anodes, switch cells formed at the space-orthogonal intersections of said anodes and collection electrodes;

delay means comprising resistor-capacitor delay units linking to said cathodes so that each said cathode links one resistor which in turn links to two capacitors in parallel, two capacitors are connected to two said collection electrodes one by one,

X direction scanning electron beam means comprising an electrode-array target screen and an electron beam gun, each target electrode in said target screen is connected to a said anode one-by-one;

Y direction scanning electron beam means comprising an electrode-array target screen and an electron beam gun of a relatively strong beam current, each target electrode in said target screen is connected to a lead of resistor and capacitors within said delay unit of said cathode one-by-one; and

each said resistor-capacitor delay unit has its time constant set such that the resultant pixel delay time is less than one scanning period of said Y-beam;

dc display supply whose output voltage is greater than or equal to the sum of the breakdown voltage of said display discharging cell and the ionizing voltage of said switch cell;

shift switch so that it always connects said display supply'"'"'s anode to said collection electrode corresponding to said matrix anode being scanned by said X-beam;

whereby said shift switch connects said collection electrode corresponding to some said anode to said display supply'"'"'s anode said X-beam emits electron beam to said anode through electrical conduction of said target electrode so that said anode'"'"'s potential decreases through being charged until said switch cell linking said anode is on, thereby said anode is passed though to said display supply;

let said Y-beam emit electron beam to some common lead of resistor and capacitors within said pixel delay unit through electrical conduction of said target electrode, the said capacitor connecting to mad collection electrode linking to said display supply'"'"'s anode is charged and said cathode'"'"'s potential decreases through being charged until a said display discharging cell at the intersection of said cathode and already-conducted said anode to said display supply'"'"'s anode is conducting;

meanwhile, a portion of beam current of said Y-beam continues to charge said capacitor, and other portion of said beam current passes through said resistor Band display discharging cell to drive said cell'"'"'s ionizing which produces negative ions flying to said anode under the electrical field, and bombarding said phosphor attached on the surface of said anode to emit light;

after said Y-beam deflects to another said cathode, the charged said capacitor is discharging through said resistor, thereby to maintain the ionizing in the just selected said display cell;

for the pixel duty delay time is less than said Y-beam scanning period, said display discharging cells and switch discharging cells of different anodes in the same set cannot be conducting simultaneously when scanning the way in which said shift switch selects said collection electrodes ensures that said display discharging cells and switch cells of different anodes in the different sets are never be in a scanning loop simultaneously, therefore, guaranteeing no disadvantageous effects of said delay means on the normal dot-by-dot scanning;

whereby deflect the electron beams of said X-beam and Y-beam according to some scanning rule, thereby change scanned said anodes and/or cathodes to move active pixels;

in the above process, simultaneously controlling the beam current of said Y-beam by the image signal source, thereby to adjust the image gray scale to achieve scanning and displaying of said image.

9. The display device as claimed in claim 8, wherein said switch cells is positioned outside said display discharging cell'"'"'s matrix within said display panel means.

10. The display device as claimed in claim 8, wherein said display cell'"'"'s ionizing voltage is designed to be relatively high voltage to increase the display power gained by said display cells.

11. The display device as claimed in claim 8, wherein said pixel duty delay time can be greater than a scanning period of said Y-gun, if it is less than (m-1) times of said Y-gun scanning period, said anodes are partitioned into m sets in a phase-order, resulting in m said collection electrodes, each said cathode is connected to m said delay units, each comprising a resistor and a capacitor, the number of said target electrodes inside said target screen of said Y-gun increases to m times of the number of Mid cathodes, each target electrode in said target screen is connected to the common lead of resistor and capacitors within said delay unit of said cathode one-by-one.

12. The display device as claimed in claim 8, wherein said phosphor is designed as low-power high-brightness phosphor producing different color light, proper arrangement of said phosphor of different color lights in matrix of the said display panel means realizes color display.

13. The display device as claimed in claim 8, wherein said X and/or Y-guns can be designed as a multiple electron beam means.

14. The display device as claimed in claim 8, wherein said X-gun used to scan said anodes can be multiple and said Y-gun used to scan said cathodes can be multiple.

15. The display device as claimed in claim 8, wherein said cathodes can be designed individually or together with said anodes, attached with said phosphor layer, and made of transparent material;

the latter case can implement double-side display.