CN100359624C - Plasma display structure - Google Patents
Plasma display structure Download PDFInfo
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- CN100359624C CN100359624C CNB2004100014725A CN200410001472A CN100359624C CN 100359624 C CN100359624 C CN 100359624C CN B2004100014725 A CNB2004100014725 A CN B2004100014725A CN 200410001472 A CN200410001472 A CN 200410001472A CN 100359624 C CN100359624 C CN 100359624C
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Abstract
The present invention provides the structure of a plasma display (PDP), which is composed of a first basal plate and a second basal plate, wherein the first surface of the first basal plate is oppositely clamped with the first surface of the second basal plate. A baffle wall is arranged between the first basal plate and the second basal plate to divide the first surface of the second basal plate into a plurality of a first, a second and a third sub-pixel regions which are alternately arranged, wherein a red fluorophor, a green fluorophor and a blue fluorophor are respectively coated on the first, the second and the third pixel zones. The adjacent first sub-pixel zone coated with the red fluorophor, the second sub-pixel region coated with the green fluorophor and the third sub-pixel region coated with the blue fluorophor form a pixel region. In each pixel region, both the area of the first sub-pixel zone coated with the red fluorophor and the area of the second sub-pixel region coated with the green fluorophor are smaller than the third sub-pixel region coated with the blue fluorophor. In addition, neon (Ne) gas is filled in all the sub-pixel regions.
Description
Technical field
(plasma display panel PDP), particularly relates to the structure of improved plasma scope luminescence unit, to promote color representation to the present invention relates to plasma scope.
Background technology
(Plasma display panels PDP) has become at present one of main product of color monitor to plasma scope, and its characteristics are thin thickness, in light weight and large scale effective area etc.
Figure 1 shows that the luminescence unit profile in a kind of PDP structure of prior art.The PDP structure of prior art by front glass substrate 11 with the back glass substrate 12 aims at the encapsulation formed, therebetween then with barrier rib 19 compartments.At header board 11 on surface in the face of back plate 12, be provided with plural strip, each other alternate be arranged in parallel keep electrode (sustain electrode) 13 and scan electrode (scanelectrode) 14 (only schematically illustrating a pair of keeping and scan electrode 13 and 14 among Fig. 1).Keeping and scan electrode 13 and 14 surfaces further cover dielectric layers 15, for example flint glass or its similar material, and further cover a protective layer 16 on its surface, as magnesium oxide, and the whole front board structure 100 that forms.
Face on the surface of header board 11 at back plate 12, the addressing electrode (address electrode) 17 (only schematically illustrating an addressing electrode 17 among Fig. 1) of a plurality of strips equally be arranged in parallel, then cover a dielectric layer 18 on it, for example flint glass or its similar material.Then, on its surface, strip barrier rib 19 is set with respect to 17 of adjacent in twos addressing electrodes.And in 19 formed grooves of per two barrier ribs, be coated with fluorescent material 20R, 20B and the 20G that represents primary colors red (R), blue (B) and green (G) respectively, and the whole back plate structure 200 that forms.
With the back on the plate 12 addressing electrode 17 and with header board 11 on keep be the vertical interlaced mode and combine with scan electrode 13 and 14 after, then 19 of two barrier ribs with each addressing electrode 17 and keep and scan electrode 13 and 14 staggered places, constitute a plurality of discharge spaces 21, as shown in Figure 1.Then in discharge space 21, fill inert gas, be mainly neon (Ne), and a spot of xenon (Xe) is as buffer gas.
The generation of above-mentioned plasma display picture when keeping when applying voltage with scan electrode 13 and 14, then causes the continuation discharge to produce ultraviolet light at discharge space 21.And ultraviolet light distributes trichromatic ruddiness, blue light or green glow after being absorbed by fluorescent material 20R, 20B in the luminescence unit 21 or 20G, forms the polychrome rank by regulating and control trichromatic stack, constitutes full-color demonstration.Generally speaking, the color representation of display frame then is subjected to the influence such as colorimetric purity (Color Purity), brightness of luminescence unit.
Summary of the invention
According to the present invention, find generally to be filled in neon (Ne) in the PDP luminescence unit can produce orange simultaneously under discharge condition visible light, influence colorimetric purity and colour temperature and show.Therefore, one object of the present invention is to improve in the PDP luminescence unit because of filling colorimetric purity and the colour temperature deviation that neon produced, to promote the image quality performance of PDP.
For reaching above-mentioned purpose, the invention provides a kind of plasma scope (PDP) structure, form by the relative structure that presss from both sides of first surface of first base with second surface of first base, barrier rib is set therebetween this second substrate, first face is separated out first of a plurality of alternate settings, second with pixel region for the third time, wherein be coated with red fluorophor respectively, green luminophore and blue fluorophor, and the pixel region first time of the whenever adjacent red fluorophor of coating, the pixel region second time of coating green luminophore constitutes a pixel region with the pixel region for the third time that is coated with blue fluorophor, and in each pixel region, be coated with red fluorophor the first time pixel region with the coating green luminophore the second time pixel region area all less than the pixel region for the third time of the blue fluorophor of coating, and all fill neon (Ne) in these times pixel region.
And in a preferred embodiment, first, second and pixel region for the third time of different sizes in above-mentioned plasma scope (PDP) structure, its corresponding addressing electrode all is arranged at the cardinal principle middle position of each time pixel region.
And in another preferred embodiment, be coated with red fluorophor the first time pixel region area less than the pixel region second time of coating green luminophore, for the second time pixel region is then less than the pixel region for the third time of the blue fluorophor of coating.Make red pixel region area in each pixel region less than green pixel region less than blue time pixel region.
Description of drawings
Figure 1 shows that the luminescence unit profile in a kind of PDP structure of prior art.
Figure 2 shows that a kind of equilateral hexagonal honeycomb time dot structure and the addressing electrode design thereof of prior art.
Fig. 3 A to 3E is depicted as according to a kind of dot structure of the present invention and addressing electrode design thereof.
Figure 4 shows that according to another kind of the present invention time dot structure.
Figure 5 shows that according to another kind of the present invention time dot structure.
Figure 6 shows that according to another kind of the present invention time dot structure.
The simple symbol explanation
11: glass substrate; 12: glass substrate; 13: keep electrode; 14: scan electrode; 15: dielectric layer; 16: protective layer; 17: addressing electrode; 18: dielectric layer; 19; barrier rib; 20R: red-emitting phosphors; 20G: green-emitting phosphor; 20B: blue emitting phophor; 100: front board structure; 200: back plate structure; 20: the back plate; 22: barrier rib; 24: pixel; R: red time pixel region; G: green time pixel region; B: blue sub-pixels district; 26R: red time address pixels electrode wires; 26G: green time address pixels electrode wires; 26B: blue sub-pixels address electrode lines; 28: the addressing electrode block; 30: the back plate; 32: barrier rib; 34: pixel; 36R: red time address pixels electrode wires; 36G: green time address pixels electrode wires; 36B: blue sub-pixels address electrode lines; 38R: red time address pixels electrode block; 38G: green time address pixels electrode block; 38B: blue sub-pixels addressing electrode block; 40: the back plate; 41; 42; 43: barrier rib; 44: pixel; 50: the back plate; 51; 52: barrier rib; 54: pixel; 60: the back plate; 61; 62; 63; 65: barrier rib; 64: pixel.
Embodiment
For allow above-mentioned purpose of the present invention, feature, and advantage can become apparent, below cooperate appended graphicly, elaborate.
General plasma scope is to be separated out discharge space, simultaneously as the fashionable supporter of vacuum seal between upper and lower panel by folder handicapping next door (rib) between front and rear panel.And the fluorescent material of generation Red, then in alternate mode, insert in the groove shaped time pixel region of forming by barrier rib and back plate (sub-pixel), and each pixel (pixel) in the plasma scope is by three pixels (sub-pixel) of red, blue and green-emitting phosphor, and just the three primary colors luminescence unit is formed.Make respectively when header board and back plate structure and then to carry out vacuum involution (sealing) after finishing, at last neon (Ne) is inserted in each time pixel region between the front and rear panel clamping.And since neon when plasma exciatiaon, can produce the orange colour temperature, and the colour temperature of orange is red with green combination, make plasma scope start when luminous, because the addition of neon orange colour temperature, red luminous intensity with green time pixel region can be increased than the blue sub-pixels district, influence trichromatic colorimetric purity and brightness performance.Therefore the present invention mainly adjusts by the space size of trichromatic pixel region, to proofread and correct trichromatic colorimetric purity and brightness performance.
Following embodiment is basic pattern with the inferior pixel design of hexagonal honeycomb (honeyeomb) shown in Figure 2, and spirit designs and the plasma display panel structure of generation according to the present invention.Yet the present invention is not as limit, and the inferior pixel region design of other shape also can spirit according to the present invention be changed.
At first general hexagonal honeycomb time pixel design is described with Fig. 2.As shown in Figure 2, form the honey comb like barrier rib 22 of equilateral hexagonal in sandblast processing procedure (sandblasting) definition on the plate 20 of back with prior art on the plate behind the plasma scope 20.Each equilateral hexagon then is a time pixel region, joins each other, and will red bluish-green three fluorescence material is alternate coats in the inferior pixel region.Each red (R), blue (B) constitute a pixel (pixel) 24 with the inferior pixel region that green (G) joins mutually. Address electrode lines 26R, 26B and the 26G of red, blue and green time pixel region then also are set on the plate 20.As shown in Figure 2, each address electrode lines is set in parallel between a pair of opposite side of equilateral hexagon time pixel region, and passes a pair of diagonal angle of hexagon time pixel region.And at each equilateral hexagon time online addressing electrode block 28 that is provided with of pixel region addressing electrode to control each time pixel region.
Embodiment one
Based on Fig. 2,, be depicted as formed pixel design based on plate behind the plasma scope of hexagonal honeycomb according to the present invention referring to Fig. 3 A.On the back plate 30 of plasma scope, still form the green time pixel region (G) of equilateral hexagon, the distance between its per two pairs of parallel opposite side is X.And blue sub-pixels district B is except the zone that keeps former equilateral hexagon, more adjust the distance of barrier rib 32 adjacent between original blue and red time pixel region (B and R) to the red time parallel passing Δ of pixel region (R) x, make blue sub-pixels district (B) expand outwardly Δ x and form octangle, the area of former hexagonal redness time pixel region (R) then dwindles Δ x relatively, as shown in Figure 3A.Dotted line in the inferior pixel among the figure is represented equilateral hexagon time pixel barriers wall among former Fig. 2.As shown in Figure 3A, adjusted elemental area: red time pixel region (R)＜green time pixel region (G)＜blue sub-pixels district (B).And each pixel 34 gross area of being formed by a blueness, red and green inferior pixel region (B, R and G) of being formed still with Fig. 2 in standard type identical.
For adjusted pixel region of more effective control, in a preferred embodiment, also adjust the position of addressing electrode block relatively, be located at the center of each time pixel region, with the luminous efficiency of effective each time of control pixel space.Referring to Fig. 3 B, be depicted as configuration mode according to a kind of addressing electrode of the present invention.Red, blue and address electrode lines 36R, the 36B of green inferior pixel region and a pair of diagonal angle that 36G still passes each time pixel region, and at the inner address electrode lines 36B of blue and red time pixel region (B and R) and the 36R invaginated type that is rectangle, make address electrode lines roughly by the inner center line of blue and red time pixel region (B and R), and preferred indent distance L=Δ x/2.The electrode wires of green pixel region G then remains unchanged, and is between a pair of opposite side of a straight line parallel by green time pixel region (G), and passes a pair of diagonal angle of green time pixel region (G).And rectangle addressing block 38R, 38B and the 38G of identical size are set in red, blue, the green time pixel region (R, B and G), its bond length is D, be arranged at respectively on address electrode lines 36R, 36B and the 36G, make on address electrode lines 36R, 36B and 36G the D/2 position by addressing electrode block 36R, 36B and 36G.When the design of above-mentioned addressing electrode is specially adapted to Δ X＞D.
Referring to Fig. 3 C, be depicted as configuration mode according to another kind of addressing electrode of the present invention.Fig. 3 C is depicted as according to the present invention, to the another kind of addressing electrode design of Fig. 3 A pixel.Wherein, address electrode lines 36B that blue and red time pixel region (B and R) is inner and the 36R invaginated type that still is rectangle, but its indent distance L=Δ x/2+S.And green pixel region (G) still remains unchanged, and is between a pair of opposite side of a straight line parallel by green time pixel region (G), and passes a pair of diagonal angle of green time pixel region (G).And on the address electrode lines 36R and 36B in red, the blue time pixel region (R and B), identical size is set respectively, the minor face width is rectangle addressing block 38R and the 38B of D, and it is provided with the position and accounts for D/2+S in the inboard of indent address electrode lines 36R and 36B, and the outside accounts for D/2-S.By this, still can keep addressing electrode block 38R and 38B still to lay respectively at middle position red, blue time pixel region (R and B) on the whole.The addressing electrode block 38G of green pixel region (G) then still is arranged on the address electrode lines 36G with the position of D/2.When the design of above-mentioned addressing electrode is applicable to Δ x＞D.
Fig. 3 D is depicted as the configuration mode according to another addressing electrode of the present invention.Fig. 3 D is depicted as according to the present invention, to the another kind of addressing electrode design of Fig. 3 A pixel.Wherein, address electrode lines 36B that blue and red time pixel region (B and R) is inner and the 36R invaginated type that still is rectangle, but its indent distance L=Δ x/2-S.And green time pixel region (G) still remains unchanged, and is the axis of a straight line by a pair of opposite side of green time pixel region (G), and passes a pair of diagonal angle of green time pixel region (G).And on the address electrode lines 36R and 36B in red, the blue time pixel region (R and B), identical size is set respectively, the minor face width is rectangle addressing block 38R and the 38B of D, and it is provided with the position and accounts for D/2-S in the inboard of indent address electrode lines 36R and 36B, and the outside accounts for D/2+S.By this, still can keep addressing electrode block 38R and 38B still to lay respectively at middle position red, blue time pixel region (R and B) on the whole.The addressing electrode block 38G of green pixel region (G) then still is arranged on the address electrode lines 36G with the position of D/2.When the design of above-mentioned addressing electrode is applicable to Δ x＞D.
Fig. 3 E is depicted as the configuration mode according to another addressing electrode of the present invention.Fig. 3 E is depicted as according to the present invention, to another addressing electrode design of Fig. 3 A pixel.When the bond length D of predetermined rectangle addressing electrode block greater than the barrier rib of blue sub-pixels district B during to distance, delta x that red time pixel region R passes (D＞Δ x), then address electrode lines 36B, 36G and 36R are set in parallel between a pair of opposite side of indigo plant, green and red pixel region (B, G and R) with linear fashion respectively, and pass a pair of diagonal angle of this grade pixel region.And on the address electrode lines 36R and 36B in red, the blue time pixel region (R and B), identical size being set respectively, the minor face width is rectangle addressing block 38R and the 38B of D.In with pixel, its position of rectangle addressing block 38B among the blue sub-pixels district B accounts for (D+ Δ x)/2 in the adjacent red time pixel region R side of its address electrode lines 36B, and opposite side accounts for (D-Δ x)/2.Similar, account for (D-Δ x)/2 with its position of rectangle addressing block 38R among the red time pixel region R in the pixel in the adjacent blue sub-pixels district B of address electrode lines 36R side, and opposite side accounts for (D+ Δ x)/2.Just, addressing electrode block 38B in the blue and red time pixel region (B and R) and 38R are toward increasing regional translation Δ x/2.By this, make addressing electrode block 38R and 38B still lay respectively at middle position red, blue time pixel region (R and B) on the whole.And the addressing electrode block 38G of green pixel region (G) then still is arranged on the address electrode lines 36G with the position of D/2.
Embodiment two
Based on Fig. 2,, be depicted as formed pixel design based on plate behind the plasma scope of hexagonal honeycomb according to the present invention referring to Fig. 4.On the back plate 40 of plasma scope, be out of shape (dotted line in the inferior pixel among the figure is represented former equilateral hexagon time pixel barriers wall) with time primitive shape of the equilateral hexagon among Fig. 2, the barrier rib 43 that blue sub-pixels district B is adjacent with red time pixel region R is to the distance of red time pixel region R translation Δ X, and former blue sub-pixels district B and barrier rib 43 adjacent barrier ribs 41 and 42 also expand outwardly thereupon, make blue sub-pixels district B still be hexagon, but area strengthens than person among Fig. 2, and the area of red time pixel region R then dwindles Δ X relatively.Simultaneously, the barrier rib 41 at green pixel region G and the two ends that blue sub-pixels district B is adjacent up and down contracts in green inferior pixel region G relatively with 42, and the area of the inferior pixel region of green is dwindled.As shown in Figure 4, general adjusted elemental area still is red time pixel region (R)＜green time pixel region (G)＜blue sub-pixels district (B).And each pixel 44 gross area of being formed are still identical with standard type among Fig. 2.
For above-mentioned adjusted the pixel region of more effective control, in preferred embodiment, more can copy the design of embodiment one, adjust the position of address electrode lines and addressing electrode block relatively, be located at the center of each time pixel region, with the luminous efficiency of effective each time of control pixel space.
Embodiment three
Based on Fig. 2,, be depicted as formed pixel design based on plate behind the plasma scope of hexagonal honeycomb according to the present invention referring to Fig. 5.On the back plate 50 of plasma scope, with the length of side among Fig. 2 is that the equilateral hexagon time primitive shape of Y is out of shape (barrier rib that the dotted line in inferior pixel among the figure is represented the inferior pixel of former equilateral hexagon), the barrier rib 51 and 52 that blue sub-pixels district B is adjacent with red the pixel region R that joins up and down respectively up with the distance of the Δ Y that moves down, make blue sub-pixels district B expand outwardly octangle into the cap shape, and the area of the red time pixel region R of adjacent hexagon dwindles relatively, and green time pixel region G still keeps equilateral hexagon.As shown in Figure 5, adjusted elemental area is red time pixel region (R)＜green time pixel region (G)＜blue sub-pixels district (B).And each pixel 54 gross area of being formed are still identical with standard type among Fig. 2.
For above-mentioned adjusted the pixel region of more effective control, in a preferred embodiment, more can copy the design of embodiment one, adjust the position of address electrode lines and addressing electrode block relatively, be located at the center of each time pixel region, with the luminous efficiency of effective each time of control pixel space.
Embodiment four
Based on Fig. 2,, be depicted as formed pixel design based on plate behind the plasma scope of hexagonal honeycomb according to the present invention referring to Fig. 6.On the back plate 60 of plasma scope, with the length of side among Fig. 2 is that the equilateral hexagon time primitive shape of Y is out of shape (barrier rib that the dotted line in inferior pixel among the figure is represented the inferior pixel of former equilateral hexagon), redness and the green time adjacent barrier rib 61 and 63 of pixel region (R and G) that blue sub-pixels district B and top and below are joined, 62 and 65 respectively up with the distance of mobile respectively Δ Y down, blue sub-pixels district B is expanded outwardly, be the hexagon that symmetry is up and down elongated, and red relative the dwindling of area with green inferior pixel region (R and G) of its adjacent hexagon.As shown in Figure 6, adjusted elemental area is red time pixel region (R)＜green time pixel region (G)＜blue sub-pixels district (B).And each pixel 64 gross area of being formed are still identical with standard type among Fig. 2.
For above-mentioned adjusted the pixel region of more effective control, in preferred embodiment, more can copy the design of embodiment one, adjust the position of address electrode lines and addressing electrode block relatively, be located at the center of each time pixel region, with the luminous efficiency of effective each time of control pixel space.
According to the formed back plate structure of the foregoing description, after carrying out the vacuum involution with header board, after pouring into inert gas based on neon, produce ultraviolet ray when applying voltage, and when exciting red, green and blue emitting phophor in each time pixel, because the area of the pixel region for the third time of blue emitting phophor is greater than red and green time pixel region, can the appropriateness adjustment orange colour temperature that neon sent, the colour purity and the intensity of proofreading and correct red, green, blue three looks time pixel region.
Though above embodiment all is designed to basis and explanation with honey comb like pixel barriers wall of hexagonal, but according to spirit of the present invention, also can be applicable to the inferior pixel design of other shape, the barrier rib design of for example rectangular interval shape, the barrier rib design of grid-like (grid type) etc., all can be according to spirit of the present invention, adjust the relative size of red bluish-green three pixel space, make red time pixel region≤green time pixel region＜blue sub-pixels district, to revise the colour cast that produces because fill orange colour temperature neon.
Though the present invention discloses as above in conjunction with the preferred embodiments; yet it is not in order to limit the present invention; those skilled in the art without departing from the spirit and scope of the present invention; can do a little change and retouching, thus protection scope of the present invention should with accompanying Claim the person of being defined be as the criterion.
Claims (9)
1. plasma display panel structure comprises:
One first substrate;
One second substrate;
One barrier wall structure, be arranged on this second surface of first base, second surface of first base is relative when pressing from both sides structure with this and when this first surface of first base, in order to this second surface of first base is separated out first of a plurality of alternate settings, second with pixel region for the third time, wherein be coated with red fluorophor respectively, green luminophore and blue fluorophor, and the pixel region first time of the whenever adjacent red fluorophor of coating, the pixel region second time of coating green luminophore constitutes a pixel region with the pixel region for the third time that is coated with blue fluorophor, and in each pixel region, this be coated with red fluorophor the first time pixel region and this barrier rib between the pixel region for the third time that is coated with blue fluorophor pass to the pixel region first time that this is coated with red fluorophor, make this be coated with red fluorophor the first time pixel region and the pixel region second time of this coating green luminophore all be coated with the pixel region for the third time of blue fluorophor less than this, and all fill neon in these times pixel region; And
A plurality of first, second and the 3rd addressing electrodes, be arranged on this second surface of first base, these a plurality of first, second and the 3rd addressing electrodes comprise pass respectively this first, second with the address electrode lines of pixel region for the third time, and lay respectively at this first, second with the addressing electrode block of the position of pixel region central authorities for the third time.
2. plasma display panel structure as claimed in claim 1, wherein this addressing electrode block is a rectangle.
3. plasma display panel structure as claimed in claim 1, wherein the pixel region first time that is coated with red fluorophor of this in each pixel region is less than or equal to the pixel region second time of this coating green luminophore.
4. plasma display panel structure as claimed in claim 1, wherein this first, second with pixel region for the third time be hexagon.
5. plasma display panel structure as claimed in claim 1, wherein this coating red with first and second time pixel region green luminophore be hexagon, and the pixel region for the third time of the blue fluorophor of this coating is an octangle.
6. plasma display panel structure as claimed in claim 1, wherein this, pixel region was an equilateral hexagon second time.
7. plasma display panel structure as claimed in claim 1, wherein each pixel region is 12 dihedrals.
8. plasma display panel structure as claimed in claim 1, wherein this be coated with red fluorophor the first time pixel region and the pixel region for the third time of the blue fluorophor of coating in, this address electrode lines invaginated type that is rectangle makes this addressing electrode block lay respectively at the middle position of each time pixel region.
9. plasma display panel structure as claimed in claim 1, wherein this be coated with red fluorophor the first time pixel region and the pixel region for the third time of the blue fluorophor of coating in, this addressing electrode block be provided with in the width difference of separately address electrode lines both sides to be positioned at the middle position of each time pixel region.
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| CN100359624C true CN100359624C (en) | 2008-01-02 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6088011A (en) * | 1995-09-21 | 2000-07-11 | Orion Electric Co., Ltd. | Color plasma display panel |
| CN1347131A (en) * | 2000-10-02 | 2002-05-01 | 三星Sdi株式会社 | Plasma display screen with different width partition wall |
| KR20020050817A (en) * | 2000-12-22 | 2002-06-28 | 엘지전자 주식회사 | Plasma display panel |
| CN1388556A (en) * | 2001-05-26 | 2003-01-01 | 三星Sdi株式会社 | Plasma display screen |
| CN1407583A (en) * | 2001-08-20 | 2003-04-02 | 三星Sdi株式会社 | Plasma display panel with delta electric discharge unit |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6088011A (en) * | 1995-09-21 | 2000-07-11 | Orion Electric Co., Ltd. | Color plasma display panel |
| CN1347131A (en) * | 2000-10-02 | 2002-05-01 | 三星Sdi株式会社 | Plasma display screen with different width partition wall |
| KR20020050817A (en) * | 2000-12-22 | 2002-06-28 | 엘지전자 주식회사 | Plasma display panel |
| CN1388556A (en) * | 2001-05-26 | 2003-01-01 | 三星Sdi株式会社 | Plasma display screen |
| CN1407583A (en) * | 2001-08-20 | 2003-04-02 | 三星Sdi株式会社 | Plasma display panel with delta electric discharge unit |
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