JP4457526B2 - Display panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display panel, in particular a plasma display panel.
[0002]
[Prior art]
Hereinafter, a conventional plasma display panel will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing an AC type (AC type) plasma display panel.
[0003]
In FIG. 1, reference numeral 41 denotes a front glass substrate, and display electrodes 42 are formed on the front glass substrate 41. Further, the display electrode 42 is covered with a dielectric layer 43 and a magnesium oxide (MgO) dielectric protective layer 44.
[0004]
Reference numeral 45 denotes a rear glass substrate. On the rear glass substrate 45, an address electrode 46, a partition wall 47, and a phosphor layer (50 to 52) are provided. A discharge space 49 encloses a discharge gas. It has become. The phosphor layers are arranged in order of three color layers of red 50, green 51, and blue 52 for color display. Each of the phosphor layers (50 to 52) emits light by excitation with vacuum ultraviolet rays (wavelength 147 nm) having a short wavelength generated by discharge.
[0005]
Further, as shown in FIG. 2, there is a panel structure in which each discharge space is made independent by barrier ribs 47a and 47b formed in a grid pattern for the purpose of improving discharge efficiency and preventing discharge leakage to the adjacent discharge space.
[0006]
As the phosphor constituting the phosphor layers 50 to 52, the following materials are generally used.
[0007]
“Blue phosphor”: BaMgAl ₁₀ O ₁₇ : Eu
“Green phosphor”: Zn ₂ SiO ₄ : Mn or BaAl ₁₂ O ₁₉ : Mn
“Red phosphor”: Y ₂ O ₃ : Eu or (Y _x Gd _1-x ) BO ₃ : Eu
Each color phosphor can be produced as follows.
[0008]
In the blue phosphor (BaMgAl ₁₀ O ₁₇ : Eu), first, barium carbonate (BaCO ₃ ), magnesium carbonate (MgCO ₃ ), and aluminum oxide (α-Al ₂ O ₃ ) are paired in an atomic ratio of Ba, Mg, and Al. Mix to make 10: 1. Next, a predetermined amount of europium oxide (Eu ₂ O ₃ ) is added to the mixture.
[0009]
Then, it is mixed with an appropriate amount of flux (AlF ₂ , BaCl ₂ ) by a ball mill, and fired at 1400 ° C. to 1650 ° C. for a predetermined time (for example, 0.5 hour) in a reducing atmosphere (in H ₂ and N ₂ ). .
[0010]
The red phosphor (Y ₂ O ₃ : Eu) is blended so that the atomic ratio of yttrium hydroxide Y ₂ (OH) ₃ , boric acid (H ₃ BO ₃ ) and Y, B is 1: 1 as a raw material. Next, a predetermined amount of europium oxide (Eu ₂ O ₃ ) is added to this mixture, mixed with a suitable amount of flux by a ball mill, and fired at 1200 ° C. to 1450 ° C. for a predetermined time (for example, 1 hour). obtain.
[0011]
In the green phosphor (Zn ₂ SiO ₄ : Mn), zinc oxide (ZnO) and silicon oxide (SiO ₂ ) are blended as raw materials so that the atomic ratio of Zn and Si is 2: 1. Next, a predetermined amount of manganese oxide (Mn ₂ O ₃ ) is added to the mixture, mixed by a ball mill, and then obtained in air at 1200 ° C. to 1350 ° C. for a predetermined time (for example, 0.5 hour).
[0012]
A phosphor material having a predetermined particle size distribution is obtained by pulverizing the phosphor particles produced by the above production method after pulverization.
[0013]
Hereinafter, a conventional method for manufacturing a PDP will be described.
[0014]
An address electrode made of silver is formed on the back glass substrate, and a visible light reflecting layer made of dielectric glass and a glass partition are formed on the back glass substrate at a predetermined pitch.
[0015]
A phosphor layer is formed by disposing each color phosphor paste including a red phosphor, a green phosphor, and a blue phosphor in each space sandwiched between the barrier ribs. The body layer is fired to remove resin components and the like in the paste (phosphor firing process).
[0016]
After firing the phosphor, a low-melting glass paste is applied around the back plate as a sealing material for sealing with the front plate, and calcined at about 350 ° C. to remove the resin component and the like in the low-melting glass paste (low Melting point glass paste calcining step).
[0017]
Thereafter, a front plate on which a display electrode, a dielectric glass layer, and a protective layer are sequentially formed, and the back plate are arranged opposite to each other so that the display electrode and the address electrode are orthogonal to each other through a partition wall, and fired at about 450 ° C. The periphery is sealed with glass (sealing process).
[0018]
Thereafter, the panel is evacuated with a vacuum pump or the like while being heated to about 350 ° C. In addition, the inside of the panel is kept in a vacuum state by the start of the gas adsorption effect of the gas adsorption member (exhaust process). Only the pressure of is introduced.
[0019]
[Problems to be solved by the invention]
As described above, in the conventional evacuation process, the inside of the panel is evacuated while being heated using a temperature profile as shown in FIG. Since the discharge space in the panel is very finely divided by the barrier ribs, an exhaust time of about 6 to 24 hours is usually required to evacuate the panel to a predetermined degree of vacuum. This occupies a very large time in the panel manufacturing process, and shortening of this process is expected to shorten the lead time of the manufacturing process and reduce costs. Further, the impurity gas remaining in the panel due to insufficient evacuation causes the discharge efficiency to decrease.
[0020]
Accordingly the present invention for such problem, and aims to make more efficient evacuation of the panel, valid panel to evacuation of panels with well digit shaped partition structure it is to provide a structure. Furthermore, it is possible to obtain good display characteristics by the panel according to the present invention.
[0021]
[Means for Solving the Problems]
In order to achieve the above object, the display panel of the present invention is provided with a recess at a part of the top of the partition wall at the crossing portion of the grid-shaped partition wall formed in the panel, so that the vacuum exhaust efficiency in the panel is improved during the vacuum exhaust process. It is characterized by improving.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a plasma display panel (hereinafter referred to as PDP) in an embodiment of the present invention will be described.
[0023]
(First embodiment)
FIG. 4 is a cross-sectional perspective view showing an outline of an AC surface discharge type PDP according to an embodiment of the present invention.
[0024]
This PDP includes a front plate in which a display electrode 42, a dielectric layer 43, and a protective layer 44 are disposed on a front glass substrate 41, and an address electrode 46, a partition wall 47, and phosphor layers 50 to 52 on a rear glass substrate 45. The arrangement is such that a discharge gas is sealed in a discharge space 30 formed between the front plate and the back plate by pasting together the arranged back plates.
[0025]
The partition wall 47 formed on the back glass substrate 45 is configured to come into contact with the dielectric layer 43 formed on the front glass substrate 41 disposed opposite to the top of the partition wall 47 via the protective layer 44. A recess 70 is arranged in a part of the top portion.
[0026]
The arrangement of the recesses 70 will be described in detail with reference to FIG. 5 when the PDP is viewed from the display surface. If the recess 70 is arranged near the discharge region in the adjacent discharge space 30 partitioned by the partition wall 47, there is a possibility that discharge leakage or light emission of the phosphor 50 may leak during discharge emission of each cell. It is desirable that the electrode 42 be disposed at a position between the electrodes 42.
[0027]
Moreover, in order to exhaust the inside of a panel through the recessed part 70 which arrange | positioned the adjacent discharge space 30 in the partition 47, and to acquire the effect of exhaust_gas | exhaustion efficiency improvement, it is desirable to set the recessed part about 10 micrometers or more in the recessed part 70. FIG.
[0028]
Next, a manufacturing method for carrying out the present invention will be described.
[0029]
If the partition wall 47 is formed by a printing method, the partition wall material may not be applied to the portion corresponding to the recess 70. When the partition wall 47 is formed by multi-layer printing by printing a plurality of times, the number of times of printing is set so that the recess 70 has a predetermined thickness, and then the partition wall material other than the recess 70 is printed to form the recess 70 is formed.
[0030]
It is also possible to pattern the photoresist 70 by exposing and developing the recess 70 by photolithography after forming the partition wall 47 by applying a photosensitive partition material.
[0031]
A sandblasting method can also be applied. A protective film in which a portion corresponding to the concave portion 70 is patterned is formed on the surface of the partition wall 47, and particles are sprayed onto the partition wall 47 through the protective film, and the portion corresponding to the concave portion 70 is scraped off. Thereafter, the protective film is removed to form the recess 70.
[0032]
(Second Embodiment)
FIG. 6 shows a panel configuration in the second embodiment. It differs from the first embodiment in that the partition walls 47 are formed in a cross-beam shape to improve discharge efficiency and prevent discharge leakage. In such a panel structure, since the discharge spaces are close to independent closed spaces, the exhaust efficiency is further deteriorated. For the purpose of improving the exhaust efficiency, a panel structure is proposed in which the height of the partition wall 47a is smaller than that of the partition wall 47b. However, for such a panel as shown in FIG. Efficiency can be improved.
[0033]
A portion where the concave portion 70 is disposed will be described with reference to FIG. 7 in which the PDP is viewed from the display surface. Partitions 47a and 47b are formed to separate adjacent discharge spaces. The recess 70 may be disposed at the intersection of the partition wall 47a and the partition wall 47b. However, since the height of one partition wall 47a is lower than that of the other partition wall 47b, the partition wall height of the recess 70 may be the same as that of the partition wall 47a. Absent.
[0034]
(Third embodiment)
It is also conceivable to form a recess on the front glass substrate 41 for the purpose of improving the exhaust efficiency. The embodiment described above is characterized in that a recess is formed in the partition wall 47 on the rear glass substrate 45, but by forming a recess also on the front glass substrate 41, the exhaust efficiency of the panel is further increased. Can be improved. FIG. 8 or 9 shows an example of the third embodiment.
[0035]
In the present case, the concave portion is described as a portion having a shape recessed with respect to the peripheral portion. For this reason, it is clear that the same effect can be obtained for a panel structure having a convex shape in the peripheral portion when viewed from the concave portion.
[0036]
The present invention can be applied to a panel having a partition wall, and the exhaust efficiency in the panel can be improved.
[0037]
Further, when driving the PDP, as shown in FIG. 10, each driver and the panel drive circuit 100 are connected to the PDP and applied between the scan electrode 101a and the address electrode 102 of the cell to be lit to generate an address discharge. Then, a sustain discharge is performed by applying a pulse voltage between the display electrodes 101a and 101b. Then, ultraviolet light is emitted in the cell along with the discharge, and converted into visible light in the phosphor layer. When the cell is lit in this manner, an image is displayed.
[0038]
In the above embodiment, the surface discharge type PDP is exemplified, but the present invention can be applied to all panels having a partition wall such as a counter discharge type PDP and an FED.
[0039]
【The invention's effect】
As described above, according to the present invention, it is possible to improve the exhaust efficiency of the panel during the exhaust process, shorten the exhaust time, and provide a panel with good display characteristics with less impure gas remaining in the panel.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional perspective view of a conventional AC surface discharge type plasma display panel. FIG. 2 is a schematic cross-sectional perspective view of another AC surface discharge type plasma display panel. FIG. 4 is a cross-sectional perspective view of an AC surface discharge type plasma display panel according to the first embodiment of the present invention. FIG. 5 is a diagram showing the first embodiment from the display surface. FIG. 7 is a sectional perspective view of an AC surface discharge type plasma display panel in the embodiment of the present invention. FIG. 7 is a diagram showing the second embodiment from the display surface. FIG. 8 is an AC surface discharge in the third embodiment of the present invention. FIG. 9 is a cross-sectional perspective view of an AC surface discharge type plasma display panel according to a third embodiment of the present invention. FIG. 10 is a diagram showing a PDP according to the present embodiment. Shows a PDP display apparatus connected to the circuit [Description of symbols]
30 discharge space 41 front glass substrate 42 display electrodes 43a, 43b, 43c, 43d dielectric layer 44 protective layer 45 rear glass substrate 46 address electrodes 47a, 47b partition 50-52 phosphor 70 recess

Claims (8)

The cross-shaped barrier ribs formed on at least one of the two substrates arranged opposite to each other, a plurality of discharge spaces partitioned by the cross-beam-shaped barrier ribs, and the intersection of the cross-beam-shaped barrier ribs And a recess formed in at least a part of the top of the partition wall , wherein the four discharge spaces adjacent to the intersection are connected through the recess .   The display panel according to claim 1, wherein the recess is disposed between adjacent discharge electrodes among a plurality of discharge electrodes formed on the other substrate. Display panel according to claim 1 or 2, characterized by providing the recesses in the surface of the counter substrate corresponding to the recess formed on the partition wall top. Display panel according to any one of claims 1 to 3, the depth of the recess and wherein the at least 10μm or more. The grid-shaped partition includes a plurality of first partitions and a plurality of second partitions formed to intersect the first partitions, and the height of the first partitions is the first partition 5. The display panel according to claim 1, wherein the display panel is lower than a height of the partition walls. The display panel according to claim 5, wherein the height of the partition wall of the recess is the same as the height of the first partition wall. Display panel according to any one of claims 1 to 6, wherein said display panel is a plasma display or a field emission display. A display device comprising the display panel and a drive circuit for driving the display panel, wherein the display panel is the display panel according to claim 7 .

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