Full color surface discharge type plasma display device

• US 5,674,553 A
• Filed: 06/02/1995
• Issued: 10/07/1997
• 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): BELL, JANYCE A
• Application Number:
  US08/458,288
• Time in Patent Office: 858 Days
• Field of Search: 427/68, 427/162, 427/226, 427/265, 427/269, 427/287, 427/419.2
• US Class Current: 427/68
• 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 process for manufacturing a substrate of a surface discharge plasma display device producing a color display and in which address electrodes and barriers are formed on a main surface of the substrate, extending in a first direction parallel to each other, each pair of adjacent barriers having respective sidewalls spaced apart in a second direction, transverse to the first direction, and defining therebetween a discharge space with an associated address electrode disposed therebetween, each of said address electrodes comprising a main portion for display and a connecting portion, contacting an end of said main portion and for connecting to an outer lead, said process comprising the steps of:

printing a material for forming said main portions of the address electrodes on the main surface of the substrate, using a printing mask;

printing a material for forming said connecting portions of the address electrodes on the main surface of the substrate and contacting the corresponding main portions of the respective address electrodes; and

printing a material for forming said barriers using said printing mask used for printing said material for forming said main portions of the address electrodes.

2. A process for manufacturing a surface discharge type plasma display device producing a color display and comprising first and second substrates having corresponding main surfaces in facing and parallel, spaced relationship and defining a discharge space therebetween in which a discharge gas is filled and selectively discharged for producing a display in a display area of first and second dimensions in respective first add second orthogonal directions, a plurality of pairs of lines of display electrodes formed on the main surface of the first substrate and extending in parallel relationship in the first direction, a plurality of address electrodes formed on the main surface of the second substrate and extending in parallel relationship in the second direction and spaced in the first direction and a plurality of phosphor layers emitting respective and different, primary luminescent colors and formed as respective, plural and parallel stripes extending in the second direction respectively in association with and covering the plurality of address electrodes and arranged in plural, successive sets of stripes spaced in the first direction, each set including a common arrangement of successive stripes of the respective, different primary colors, said process comprising the steps of:

forming barriers on the main surface of the second substrate, extending in parallel in the second direction and spaced in the first direction, thereby dividing and separating said discharge space into elongated discharge spaces between respective pairs of adjacent barriers, each discharge space being uninterrupted for at least the first dimension and corresponding to a respective address electrode and associated phosphor layer stripe;

almost filling said elongated discharge spaces, between said barriers and above the main surface of said second substrate, with respective phosphor pastes corresponding to the respective luminescent colors of the associated phosphor layer stripes;

firing said phosphor pastes to reduce the volume of said phosphor paste within each respective elongated discharge space and to form each said phosphor layer stripe covering substantially the entire surfaces of the side walls of said respective pair of adjacent barriers, the surface of said second substrate and the associated address electrode disposed between said respective pair of adjacent barriers.

3. A process according to claim 2 wherein said phosphor paste comprises phosphor in an amount of 10 to 50% by weight.

4. A process according to claim 2 wherein said filling step is performed by screen printing said phosphor paste into said gaps with a square squeezer at a set angle of 70 to 85 degrees.

5. A process according to claim 4 wherein the square squeezer is at a cross angle of 25°

to 40°

.

6. A process according to claim 2 wherein each set of stripes comprises n stripes formed of n respective phosphor pastes and respectively producing to n primary luminescent colors, wherein n is a whole number, successive sets having a pitch p, the filling step further comprising:

in a first of n successive filling substeps;

(a) selecting a respective, first phosphor paste, of the n phosphor pastes;

(b) positioning a printing mask, having elongated apertures therein of the first dimension in the first direction and spaced in the second direction by the pitch p, on the barriers with the elongated apertures thereof aligned with a respective, first set of elongated discharge spaces wherein adjacent, successive said spaces are separated by the pitch p, and

(c) forcing the first selected phosphor paste through the elongated apertures of the mask and into the elongated discharge spaces of the respective first set; and

in each successive filling substep, of the n successive filling substeps, repeating step (a) for a respective, successive and different phosphor paste and repeating steps (b) and (c) for a respective, successive and different set of elongated discharge spaces.

7. A process according to claim 6 wherein the number n of primary luminescent colors is three.

8. A process according to claim 2 wherein each address electrode comprises a main portion substantially of the second dimension and a connecting portion contacting an end of said main portion and disposed in the second direction outside the display area, said process further comprising, before the step of forming barriers, the steps of:

printing a material for forming said main portions of the address electrodes on the main surface of the substrate, using a printing mask;

printing a material for forming said connecting portions of the address electrodes on the main surface of the substrate and contacting the corresponding main portions of the respective address electrodes; and

printing a material for forming said barriers using said printing mask used for printing said material for forming said main portions of the address electrodes.

9. A process for manufacturing a substrate assembly for a surface discharge type plasma display panel producing a color display, employing an insulating plate having a main surface and first and second different directions defined thereon, the process comprising the steps of:

(a) using a printing mask, printing the material for forming plural address electrodes on the main surface of the insulating plate, extending in parallel relationship in the first direction and spaced so as to define corresponding gaps therebetween in the second direction;

(b) using the printing mask employed in step (a), printing plural barriers on the main surface of the insulating plate, extending in the first direction, parallel to the plural address electrodes and disposed respectively in the gaps between the plural address electrodes and correspondingly spaced in the second direction, each pair of adjacent barriers defining therebetween a corresponding, elongated cavity and having a respective address electrode therebetween, the plural elongated cavities being of a substantially common length in the first direction corresponding to a first dimension of the display area in the first direction and each being uninterrupted throughout the length thereof; and

(c) for a first primary color, of plural primary colors of the color display and using a printing mask having elongated openings therein corresponding to a selected set of the plural elongated cavities designated to have formed therein respective color phosphor layer stripes commonly of the first primary color, positioning the mask with the elongated openings therein aligned with the cavities of the designated set and forcing a respective, primary color phosphor material through the elongated openings of the mask and into, and substantially filling each of, the corresponding, plural elongated cavities of the selected set; and

(d) repeating step (c) for each further and different primary color of the plural primary colors, in individual succession.

10. A process as recited in claim 9, further comprising:

forming a dielectric layer on the main surface of the insulating plate; and

forming the plural address electrodes and plural ribs on the dielectric layer.

11. A process as recited in claim 9, further comprising:

forming the plural address electrodes and the ribs directly on the main surface of the insulating plate;

forming a dielectric layer on the main surface of the insulating plate so as to cover the plural address electrodes; and

forming the barrier ribs on the surface of the dielectric layer.

12. A process as recited in claim 9, further comprising:

forming the plural address electrodes and the plural barriers directly on the main surface of the insulating plate; and

forming the color phosphor layers on the main surface of the insulating plate and covering the respective address electrodes.

13. A process as recited in claim 9, further comprising forming the plurality of barrier ribs so as to have top surfaces which are substantially planar and lie substantially in a common plane and have a common width in the first direction of not less than 15 μ

m.

14. A process recited in claim 9, further comprising, after completion of step d, firing the substrate assembly to cure the different, plural primary color phosphor materials and produce the corresponding color phosphor layer stripes in the respectively associated elongated cavities.

15. A process according to claim 9 wherein said phosphor paste comprises phosphor in an amount of 10 to 50% by weight.

16. A process according to claim 9 wherein said step (c) is performed by screen printing said phosphor paste into said gaps with a square squeezer at a set angle of 70 to 85 degrees.

17. A process according to claim 16 wherein the square squeezer is at a cross angle of 25°

to 40°

.

18. A process for manufacturing a substrate assembly for a surface discharge type plasma display panel producing a color display, the panel employing an insulating plate having a main surface and first and second different directions defined thereon, the process comprising the steps of:

(a) forming plural address electrodes on the main surface of the insulating plate, extending in parallel relationship in the first direction and spaced so as to define corresponding gaps therebetween in the second direction;

(b) forming plural barriers on the main surface of the insulating plate, extending in the first direction, parallel to the plural address electrodes and disposed respectively in the gaps between the plural address electrodes and correspondingly spaced in the second direction, respective side wall surfaces of each pair of adjacent barriers defining therebetween a corresponding, elongated cavity and the plural elongated cavities defined by plural pairs of adjacent barriers, of the plural barriers, being of a substantially common length in the first direction, corresponding to a first dimension of the display area in the first direction, and each being uninterrupted throughout the length thereof;

(c) almost filling said plural elongated cavities, between said pairs of adjacent barriers and above the main surface, with respective phosphor pastes selected from plural phosphor pastes corresponding to plural primary colors of the color display; and

(d) firing said phosphor pastes to reduce the volume of said phosphor paste within each elongated cavity and form a corresponding phosphor layer stripe in the elongated cavity covering, substantially, the entire sidewall surfaces of said respective pair of adjacent barriers.

19. A process according to claim 18 wherein each set of stripes comprises n stripes formed of n respective phosphor pastes and respectively producing n primary luminescent colors, wherein n is a whole number, successive sets having a pitch p, the filling step further comprising:

in a first of a successive filling substeps;

(a) selecting a respective, first phosphor paste, of the n phosphor pastes;

(b) positioning a printing mask, having elongated apertures therein of the first dimension in the first direction and spaced in the second direction by the pitch p, on the barriers with the elongated apertures thereof aligned with a respective, first set of elongated discharge spaces wherein adjacent, successive said spaces are separated by the pitch p, and

(c) forcing the first selected phosphor paste through the elongated apertures of the mask and into the elongated discharge spaces of the respective first set; and

in each successive filling substep, of the n successive filling substeps, repeating step (a) for a respective, successive and different phosphor paste and repeating steps (b) and (c) for a respective, successive and different set of elongated discharge spaces.

20. A process according to claim 19 wherein the number n of primary luminescent colors is three.

21. A process according to claim 18 wherein each address electrode comprises a main portion substantially of the second dimension and a connecting portion contacting an end of said main portion and disposed in the second direction outside the display area, said process further comprising, before the step of forming barriers, the steps of:

printing a material for forming said main portions of the address electrodes on the main surface of the substrate, using a printing mask;

printing a material for forming said connecting portions of the address electrodes on the main surface of the substrate and contacting the corresponding main portions of the respective address electrodes; and

printing a material for forming said barriers using said printing mask used for printing said material for forming said main portions of the address electrodes.