Full color surface discharge type plasma display device

• US 5,661,500 A
• Filed: 06/06/1995
• Issued: 08/26/1997
• Est. Priority Date: 01/28/1992
• Status: Expired due to Term

• Current Assignee: Hitachi Maxell Limited (Hitachi, Ltd.)
• Original Assignee: Fujitsu Limited
• Inventors: Nanto, Toshiyuki, Kanae, Tatsutoshi, Shinoda, Tsutae, Miyahara, Mamaru, Awaji, Noriyuki, Wakitani, Masayuki, Kanagu, Shinji
• Primary Examiner(s): Tung, Kee M.
• Assistant Examiner(s): CHOW, DOON Y
• Application Number:
  US08/469,815
• Time in Patent Office: 812 Days
• Field of Search: 345/60, 345/62, 345/65, 345/66, 345/67, 345/78, 345/88, 345/55, 313/584, 313/585, 313/586, 313/484, 313/485, 313/491, 313/492
• US Class Current: 345/60
• CPC Class Codes: H01J 11/12 with main electrodes provided on both sides of the discharge space
• CPC Class Codes: H01J 11/36 Spacers, barriers, ribs, partitions or the like
• CPC Class Codes: H01J 11/42 Fluorescent layers
• CPC Class Codes: H01J 9/241 the vessel being for a flat panel display H01J9/261 takes precedence; flat discharge lamps H01J9/248

Abstract

A full color three electrode surface discharge type plasma display device that has fine image elements and is large and has a bright display. The three primary color luminescent areas are arranged in the extending direction of the display electrode pairs in a successive manner and an image element is composed by the three unit luminescent areas defined by these three luminescent areas and address electrodes intersecting these three luminescent areas. Further, phosphors are coated not only on a substrate but also on the side walls of the barriers and on address electrodes. The manufacturing processes and operation methods of the above constructions are also disclosed.

Claims

1. A full color surface discharge plasma display device having a plurality of image elements, comprising:

first and second substrates in facing and parallel relationship to each other and defining a space therebetween in which a discharge gas is filled;

a plurality of pairs of display electrodes formed in parallel on the first substrate and facing the second substrate and extending in a first direction, the display electrodes of each pair being parallel to each other and spaced in a second direction, perpendicular to the first direction, and constituting an electrode pair for surface discharge;

a dielectric layer over the display electrodes and the first substrate;

a plurality of sets of address electrodes formed on the second substrate and facing the first substrate, the address electrodes extending in the second direction and intersecting the display electrodes;

a plurality of phosphor layers arranged as corresponding, elongated phosphor layer stripes disposed adjacent respective address electrodes, the number of the plurality of phosphor layers corresponding to the number of the plural address electrodes of each set thereof, the respective pluralities of the corresponding, elongated phosphor layer stripes being arranged in successive and repetitive sets, the successive sets being displaced in the first direction and each set of the successive sets corresponding to a respective set of address electrodes;

barriers on the second substrate which divide and separate said discharge space into elongated cavities corresponding to respective phosphor layer stripes, the barriers having side walls with respective surfaces; and

each image element of the plurality thereof being defined by portions of the phosphor layer stripes and respective address electrodes of corresponding sets thereof crossed by a pair of display electrodes, each of the phosphor layer stripes emitting a respective, characteristic and different luminescent color and the phosphor layer stripes of the successive sets image elements being arranged in a common, successive order of the luminescent colors.

2. A device according to claim 1, further comprising an erase address type drive control system such that when all of the image elements corresponding to a selected pair of display electrodes are written, an erase pulse is applied to one of the selected pair of the display electrodes and, simultaneously, an electric field control pulse for neutralizing the applied erase pulse is selectively applied.

3. A device according to claim 1, further comprising a write address type drive control system by which in displaying a line corresponding to a pair of the display electrodes, a discharge display pulse is applied to one of the pair of the display electrodes and simultaneously an electric field control pulse for writing is selectively applied to the address electrodes.

4. A device according to claim 3, wherein when said write address type drive control system displays a line corresponding to a selected pair of the display electrodes, once all of the image elements corresponding to the display electrodes are subject to writing and erasing discharges to store positive electric charges above said phosphor layers and negative electric charges above said dielectric layer, an electric discharge display pulse is applied to one line of the selected pair of the display electrodes to make said one line of the selected pair of the display electrodes negative in electric potential to the other line of the selected pair of the display electrodes, and an electric discharge pulse is selectively applied to the address electrodes to make the address electrodes positive in electric potential to said one line of the selected pair of the display electrodes.

5. A device according to claim 1, wherein each pair of said display electrodes comprises a combination of a transparent conductor line and a metal line in contact with said transparent conductor line, said metal line having a width narrower than that of the transparent conductor line and being disposed on a viewing side of the phosphor layers.

6. A device according to claim 1, wherein said barriers extend from and are fixed only to said second substrate.

7. A device according to claim 6, wherein said barriers have a substantially common height, within ±

10 μ

m of each other.

8. A device according to claim 7, wherein said barriers have respective, substantially flat top surfaces disposed in a common plane.

9. A device according to claim 1, wherein each of said barriers comprises a first barrier portion formed on one of the substrates and a second barrier portion formed on the other of the substrates.

10. A full color surface discharge plasma display device, comprising:

first and second substrates in facing and parallel relationship and defining a space therebetween in which a discharge gas is filled, the first substrate being disposed on a side of a viewer;

a plurality of pairs of display electrodes formed in parallel on the first substrate and facing the second substrate and extending in a first direction, the display electrodes of each pair being in parallel and spaced relationship and constituting an electrode pair for surface discharge, each display electrode comprising a combination of a transparent conductor line and a metal line in contact with said transparent conductor line and having a width narrower than a width of the transparent conductor line;

a dielectric layer over the display electrodes and the first substrate;

a plurality of address electrodes, formed on the second substrate and facing the first substrate, extending in a second direction and intersecting the display electrodes;

barriers on the second substrate in parallel with said address electrodes and dividing said discharge gas space into elongated cavities, each barrier having corresponding side walls;

a plurality of phosphor layers facing the display electrodes, each phosphor layer emitting a respective and different luminescent color and being defined as a plurality of phosphor layer stripes, each stripe extending substantially without interruption throughout a length thereof, disposed adjacent respective address electrodes in plural, successive sets spaced in the first direction, each set including plural stripes in a common arrangement of respective and successive, different luminescent colors; and

the intersecting portions of each set of address electrodes with each pair of display electrodes defining a corresponding image element of plural luminescent areas respectively defined by the portions of the address electrodes and the associated phosphor layer stripes of the respective and different luminescent colors.

11. A device according to claim 10, wherein the total width of a pair of the display electrodes and a gap for discharge, formed between said pair of the display electrodes, is less than 70% of a pitch of successive said pairs of display electrodes.

12. A device according to claim 10 wherein each of said barriers comprises a top portion of a low melting point glass containing a dark color colorant and a bottom portion of a low melting point glass containing a light color colorant.

13. The full color plasma display device according to claim 10 in which the discharge gas comprises a Penning gas mixture of neon with xenon, the xenon being in an amount of from 1 to 15 mole %.

14. A full color surface discharge type plasma display device comprising:

a plurality of pairs of display electrodes extending in parallel relationship with respect to each other in a first direction and disposed substantially in a common, first plane, the display electrodes of each pair defining a surface discharge space therebetween;

a plurality of sets of address electrodes disposed substantially in a common, second plane and extending in a second direction, perpendicular to the first direction, and disposed in parallel, spaced relationship in the first direction, each set comprising a group of plural address electrodes intersecting the display electrodes;

a plurality of phosphor layers of respective, different luminescent colors disposed in facing relationship with respect to the display electrodes, the number of the plurality of phosphor layers corresponding to the number of the plural address electrodes of each set of the plurality of sets of address electrodes thereof and each layer comprising a plurality of corresponding, elongated phosphor stripes, the respective pluralities of the corresponding, elongated phosphor stripes of the plurality of phosphor layers being arranged in successive and repetitive sets, the successive sets being displaced in the first direction and each set corresponding to a respective set of address electrodes;

the plurality of pairs of display electrodes, spaced in the first direction, and the plurality of sets of address electrodes, displaced in the second direction, defining at the crossing portions thereof respectively corresponding image elements, corresponding portions of the elongated phosphor stripes of each set being related to a common image element;

physical barriers extending between the first and second planes and spaced between corresponding and adjacent elongated phosphor stripes so as to define isolated cavities between the first and second planes, each cavity associated with a corresponding elongated phosphor stripe and extending substantially without interruption at least throughout a length of the associated phosphor stripe;

each image element correspondingly comprising a subset of a set of the elongated phosphor stripe portions, one of each luminescent color;

discharge gas present in each isolated cavity; and

said image element having an area of a substantially square configuration and each of said corresponding portions of the elongated phosphor stripes having a rectangular shape that is obtained by dividing said substantially square configuration of the image element by the number of elongated phosphor stripes in each set thereof and the rectangular shape having a longer dimension in the second direction.

15. The full color plasma display device according to claim 14 in which the discharge gas comprises a Penning gas mixture of neon with xenon, the xenon being in an amount of from 1 to 15 mole %.

16. A full color surface discharge type plasma display device comprising:

a plurality of pairs of display electrodes extending in parallel relationship with respect to each other in a first direction and disposed substantially in a first common plane, each pair of display electrodes defining a surface discharge space therebetween;

a plurality of sets of address electrodes disposed substantially in a second common plane, spaced from the first common plane, and extending in parallel relationship in a second direction transverse to the first direction and intersecting the display electrodes, each set comprising plural address electrodes respectively corresponding to plural primary colors;

a plurality of phosphor layers of respective, different luminescent colors respectively corresponding to the plural primary colors, disposed adjacent the second common plane and in facing, spaced relationship with respect to the display electrodes, each phosphor layer comprising a plurality of elongated phosphor stripes, the respective pluralities of elongated phosphor stripes of the plurality of phosphor layers being arranged in a plurality of successive and repetitive sets thereof respectively corresponding to the plurality of sets of address electrodes, the elongated phosphor stripes of each set thereof respectively corresponding to the plural primary colors and being respectively associated with the address electrodes, of the associated set thereof, respectively corresponding to the plural, primary colors;

each pair of display electrodes defining, with each intersecting set of address electrodes and associated set of respectively corresponding phosphor layer stripes, a corresponding image element and each address electrode and associated phosphor stripe, within the image element, comprising a unit luminescent area;

plural physical barriers, each barrier extending between the first and second common planes and being located between adjacent address electrodes and the associated phosphor strips, adjacent said barriers defining laterally therebetween an elongated cavity which is uninterrupted through a length thereof and which isolates the respective elongated phosphor stripe, each image element correspondingly comprising plural unit luminescent areas respectively corresponding to the plural primary colors; and

discharge gas in each elongated cavity.

17. A device according to claim 16, wherein each of said image elements has an almost square configuration and each of said stripes of the phosphor layers has a rectangular shape that is obtained by dividing said square configuration of the image element by a factor of three, and has a longer dimension in the second direction.

18. A device according to claim 16, wherein each of said display electrodes comprises a combination of a transparent conductor line and a metal line in contact with the transparent conductor line, said metal line having a width narrower than a width of the transparent conductor line and being disposed on a viewing side of the phosphor layers.

19. A device according to claim 18, wherein said transparent conductor lines have partial cutouts therein, of such a shape that the surface discharge is localized to a portion between the display electrodes without the partial cutout in each unit luminescent area.

20. A device according to claim 16, wherein a total width of a pair of the display electrodes and a gap for discharge, formed between said pair of the display electrodes, is less than 70% of a pitch of successive said pairs of display electrodes.

21. A device according to claim 16, wherein said barriers have side walls and said phosphor stripes extend to and almost entirely cover the side walls of said barriers.

22. A device according to claim 21, wherein said address electrodes are disposed on a surface of a substrate opposite to said display electrodes and each of said address electrodes is entirely covered with said respective elongated phosphor stripe.

23. A device according to claim 21, further comprising a substrate and an underlying layer of a low melting point glass, containing a light color colorant, formed on said substrate, said address electrodes being formed on said underlying layer.

24. A device according to claim 21, wherein at least a part of each of said barriers comprises a low melting point glass containing a light color colorant.

25. A device according to claim 21, wherein each of said barriers comprises a low melting point glass containing a dark color colorant in a first, top portion thereof and a low melting point glass admixed with a light color colorant in a lower, bottom portion thereof.

26. The full color plasma display device according to claim 16 in which the discharge gas comprises a Penning gas mixture of neon with xenon, the xenon being in an amount of from 1 to 15 mole %.

27. A full color plasma display device having plural image elements and comprising:

(a) a transparent front substrate on an inside surface of which are provided a plurality of parallel display electrode pairs, extending in a first, longitudinal direction and defining a plurality of respective display lines, and a dielectric layer covering said display electrode pairs;

(b) a rear substrate provided with a plurality of addressing electrodes extending in a second direction, transverse to said first, longitudinal direction of said display lines and traversing said display lines, said front and rear substrates having respective, sealed peripheries and defining a space for gas discharge therebetween;

(c) straight barriers arranged in the second direction, in parallel with said addressing electrodes, on the inside surface of said rear substrate, each pair of adjacent addressing electrodes having a respective straight barrier positioned therebetween; and

(d) phosphor layers formed as patterns of linear stripes between respective pairs of adjacent straight barriers and extending without interruption in the second direction along respective addressing electrodes, said phosphor layers comprising three distinct, different color phosphor layers arranged in a repeating succession of three distinct, different color phosphor layer linear stripes spaced in the first, longitudinal direction of said display lines and corresponding portions of each set of three adjacent, distinct and different color phosphor linear stripes and associated addressing electrodes crossing respectively corresponding portions of the plurality of display electrode pairs and defining therewith respective, plural image elements spaced in the second direction and the plural sets of color phosphor linear stripes and associated addressing electrodes spaced successively in the first direction defining, with a common pair of display electrodes crossed thereby, respective, successive image elements of the corresponding display lines.

28. The full color plasma display device according to claim 27, wherein each of said addressing electrodes is disposed centrally between a pair of adjacent straight barriers on said rear substrate and the corresponding said color phosphor stripe covers said addressing electrode.

29. A full color plasma display device comprising:

a transparent front substrate having an inside surface;

a plurality of parallel display electrode pairs formed on the inside surface of the transparent front substrate and extending in parallel in a first direction, each pair corresponding to a display line and the plurality of pairs respectively defining a plurality of display lines;

a dielectric layer covering said display electrode pairs on said inside surface of said transparent front substrate;

a rear substrate having an inside surface;

a plurality of addressing electrodes formed on the inside surface of the rear substrate and extending therealong in a second direction, traversing said first direction of said display lines;

elongated barriers arranged in parallel with said addressing electrodes, each barrier positioned between a respective pair of adjacent addressing electrodes on the inside surface of said rear substrate;

phosphor layers formed between adjacent said barriers and arranged in patterns of linear stripes extending continuously along respective addressing electrodes and in plural sets, each set comprising three different color phosphor linear stripes and the plural sets being arranged in a repeating succession in the first direction, the three color phosphor linear stripes of each set being separated from each other, in the first direction, by corresponding barriers and corresponding portions thereof crossed by a pair of parallel display electrodes constituting a single image element of the display line; and

said front and rear substrates having respective peripheries and being sealed, along the respective peripheries thereof, with a space for a gas discharge therebetween.

30. The full color plasma display device according to claim 29, wherein each of said addressing electrodes is centrally located between a pair of adjacent said elongated barriers on said rear substrate and a corresponding said linear phosphor layer stripe covers each said addressing electrode.

31. The full color plasma display device according to claim 29 in which the discharge gas comprises a Penning gas mixture of neon with xenon, the xenon being in an amount of from 1 to 15 mole %.