JP2004025766A - Manufacturing method display panel and screen printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a display panel in which the number of printing times for forming a fluorescent layer of a specified film thickness is reduced, and a filling process for a fluorescent paste can be simplified, and a printing device . <P>SOLUTION: A squeegee attaching angle θ1 is located on the opposite side to a squeegee running direction A at the crossing part of a surface B in parallel with a printing surface and the central axis C of a squeegee 15. The squeegee attaching angle θ1 is set to be 100° or more, and screen printing is performed. <P>COPYRIGHT: (C)2004,JPO

Description

【００３１】
上記表１に示す測定結果の通り、各開口率の場合において、スキージ取り付け角度θ１が１００°〜１２０°の場合は、９０°以下又は１２０°以上の場合と比較して蛍光体層の膜厚が厚く形成されていることが分かる。
そして、スキージ取り付け角度θ１が１１０°の場合に、さらに蛍光体層の膜厚が厚くばらつき無く形成されていることが分かる。
【００３２】
このようにして、本実施の形態によれば、スキージが受ける力Ｆ１（実際のペーストの吐出量を決める力）が、スキージの内側に向かって作用するため、力が逃げずに作用するので、ペーストの吐出量が従来例に比べて多くなり、１回の印刷（１回のスキージ走行）による蛍光体層の膜厚が従来例に比べて厚く形成できる。
これによって、所定の膜厚の蛍光体層を形成するための印刷回数を低減して、蛍光体の充填工程を簡略化することができる。
【図面の簡単な説明】
【図１】ＰＤＰの内部構造を示す分解斜視図である。
【図２】ＰＤＰの行電極対の構造を模式的に示す平面図である。
【図３】従来のディスプレイパネルの製造方法及び印刷装置を説明する模式図である。
【図４】図３の要部拡大図である。
【図５】本発明の実施の形態によるディスプレイパネルの製造方法及び印刷装置を説明する模式図である。
【図６】図５の要部拡大図である。
【図７】スクリーン版の開口率を説明する図である。
【符号の説明】
５　背面ガラス基板
９　隔壁
１１　ステージ
１２　スクリーン版
１３　枠
１４　支持体
１５　スキージ
θ１　スキージ取り付け角度
θ２　アタック角度[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a display panel such as a plasma display panel (PDP) and a screen printing apparatus.
[Prior art]
[0002]
As an example of the display panel, a structure of a general plasma display panel (hereinafter, referred to as PDP) will be described below. FIG. 1 is an exploded perspective view showing the internal structure of the PDP, and FIG. 2 is a plan view schematically showing the structure of the row electrode pairs 2 and 2 of the PDP.
[0003]
In FIG. 1, a front substrate 1 on the display surface side has a plurality of row electrode pairs X and Y, a dielectric layer 3 covering the row electrode pairs X and Y, and a protective layer made of MgO covering the dielectric layer 3. 4 are formed in order. The row electrode pair 2 includes a transparent electrode 2a made of a transparent conductive film such as ITO having a wide width, and a metal electrode (bus electrode) 2b made of a metal film having a small width to supplement the conductivity.
[0004]
On the other hand, on the rear glass substrate 5 on the rear side opposed to each other with the discharge space 8 interposed therebetween, the column electrodes 6, which are arranged in a direction orthogonal to the row electrode pairs X and Y and form a display cell at each intersection, The three primary color phosphor layers 7R, 7G, and 7B provided in a strip shape between 6 and partitioning the discharge space 8 and partitioning the column electrodes 6 and the side surfaces of the partition 9 to the discharge space 8 are provided. Is formed. A rare gas is injected and sealed in the discharge space 8.
[0005]
Each row electrode pair 2, 2 corresponds to one line (row) L of the matrix display as shown in FIG. 2, and is alternately arranged in the column direction so as to be adjacent to each other with a discharge gap GP therebetween. I have. In each line L, a display cell (discharge cell) is defined in the unit light emitting area E by each row electrode pair X, Y.
[0006]
Next, the display operation of the display in the above PDP will be described.
First, a lighting cell (a cell on which wall charges are formed) and a light-off cell (a cell on which no wall charges are formed) are obtained by an address operation by selective discharge between the column electrode 6 and the row electrode pair 2 shown in FIG. Selected. After the address operation, by applying a sustaining pulse to all the lines L simultaneously and alternately to the row electrode pairs X and Y, a surface discharge is generated in the lighting cell every time the sustaining pulse is applied. The phosphor layers 7R, 7G, and 7B are excited by the ultraviolet light generated by the surface discharge to emit visible light.
[0007]
[Problems to be solved by the invention]
Various methods such as a printing method, a photolithography method, and an ink-jet method have been tried for forming a phosphor layer in a display panel such as the PDP described above. Among these, the screen printing method is currently generally used.
Therefore, generally, in the manufacturing process of the display panel, the spaces between the partition walls formed on the rear glass substrate 5 of the PDP are sequentially filled with the respective phosphor pastes of R, G, and B by a screen printing method and baked. Thereby, the phosphor layers 7R, 7G, 7B are formed on the side surfaces of the rear glass substrate 5 and the partition wall 9.
[0008]
A process of filling a phosphor paste according to a conventional display panel manufacturing method will be described below with reference to FIGS. FIG. 3 is a view for explaining a conventional display panel manufacturing method and a screen printing apparatus, and is a schematic view seen from a side in a moving direction of a squeegee. FIG. 4 is an enlarged view of a main part.
[0009]
First, the rear glass substrate 5 of the PDP on which the stripe-shaped partition walls 9 shown in FIG. 1 are formed is placed on the stage 21 of the screen printing apparatus 20 shown in FIG. Then, the screen plate 22 is stretched on the flat surface (printing surface) of the top 9a of the partition wall 9 at a predetermined distance. This screen plate 22 has a mesh stretched over a frame 23 and a pattern formed on the mesh by an emulsion.
[0010]
Then, the squeegee 25 attached to the support 24 is moved in the direction of arrow A while pressing the screen plate 22 so that the phosphor paste 26 on the screen plate 22 passes through the formation pattern, and the stripe-shaped partition wall is formed. The space of the display cell defined by 9 is filled.
[0011]
As shown in FIG. 4, the squeegee mounting angle θ1 of the screen printing apparatus is the intersection angle between the plane parallel to the plane (printing surface) of the top 9 a of the partition wall 9 and the center axis of the squeegee, opposite to the squeegee running direction and printed. This is the angle of the position facing the surface. The attack angle θ2 is an angle formed between the front surface 25a of the squeegee 25 and the plane (printing surface) of the top 9a of the partition wall 9.
[0012]
As described above, in the phosphor paste filling step in the conventional display panel manufacturing method, the squeegee mounting angle θ1 is set to 90 ° or less (generally 70 ° ± 5 °) as shown in FIG. Had been used.
At this time, the force F1 for determining the discharge amount of the phosphor paste 26 is represented by an arrow (vector) shown in FIG. As shown in FIG. 4, the force F1 for determining the discharge amount of the phosphor paste 26 is applied in a direction away from the squeegee 25, and the discharge amount is not sufficient.
Therefore, in order to form a phosphor layer having a predetermined thickness, it is necessary to repeat the printing several times to fill the space of the display cell partitioned by the partition wall 9 with the phosphor paste 26.
[0013]
The present invention has been made to solve the above-described problem, and can reduce the number of times of printing for forming a phosphor layer having a predetermined film thickness, thereby simplifying a phosphor paste filling step. An object of the present invention is to provide a display panel manufacturing method and a screen printing apparatus.
[0014]
[Means for Solving the Problems]
In order to achieve the above-described object, a method of manufacturing a display panel according to the present invention is directed to a method of manufacturing a display panel in which a squeegee is run by screen printing in a space of a display cell defined by a partition. A method of manufacturing a display panel including a step of filling a body paste, wherein the step includes, at an intersection angle between a plane parallel to a printing surface of the screen printing and a central axis of the squeegee, on a side opposite to a squeegee traveling direction and The squeegee is run while the angle of the position facing the printing surface is 100 ° or more, and the phosphor paste is filled in the space of the display cell.
[0015]
Further, according to the screen printing apparatus of the present invention, as described in claim 4, a screen for running a squeegee and filling a phosphor paste in a space of a display cell partitioned by a partition wall constituting a display panel. A printing device, wherein at an intersection angle between a plane parallel to a printing surface of the screen printing device and a central axis of the squeegee, an angle of a position facing the printing surface on the opposite side to the squeegee traveling direction is 100 ° or more. The squeegee is attached to the squeegee.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, in the method for manufacturing a display panel according to the present embodiment, a partition 9 for partitioning a display cell is formed on a substrate (back glass substrate 5) in a display panel manufacturing process. Are filled in order with the phosphor pastes of R, G, and B, respectively. Further, by firing this, the phosphor layers 7R, 7G, 7B are formed on the side surfaces of the rear glass substrate 5 and the partition walls 9.
Although the PDP shown in FIG. 1 is an example in which stripe-shaped partitions are formed, the partition may be formed in a grid shape by including vertical walls extending in the column direction and horizontal walls extending in the row direction. .
[0017]
The process of filling the phosphor paste according to the display panel manufacturing method of the present embodiment will be described below with reference to FIGS. FIG. 5 is a diagram illustrating the screen printing apparatus according to the present embodiment, and is a schematic diagram viewed from the side in the moving direction of the squeegee. FIG. 6 is an enlarged view of a main part.
[0018]
First, the rear glass substrate 5 of the PDP on which the stripe-shaped or lattice-shaped partition walls 9 shown in FIG. 1 are formed is placed on the stage 11 of the screen printing apparatus 10 shown in FIG. Then, the screen plate 22 is stretched on the flat surface (printing surface) of the top 9a of the partition wall 9 at a predetermined distance. The screen plate 12 has a mesh stretched over a frame 13 and a pattern formed on the mesh by an emulsion.
[0019]
Then, by moving the squeegee 15 attached to the support 14 in the direction of the arrow A while pressing the screen plate 12, the phosphor paste 16 on the screen plate 12 passes through the formation pattern, and becomes a stripe or The space between the lattice-shaped partition walls 9 is filled.
[0020]
As shown in FIG. 6, the squeegee mounting angle θ1 of the screen printing apparatus according to the present embodiment is determined by the intersection angle between the plane parallel to the plane (printing surface) of the top 9a of the partition 9 and the central axis of the squeegee, and the squeegee traveling direction. And the angle of the position facing the printing surface. The attack angle θ2 is an angle formed between the bottom surface 15b of the squeegee 15 and the plane (printing surface) of the top 9a of the partition 9.
[0021]
In the phosphor paste filling step in the display panel manufacturing method according to the present embodiment, the screen printing is performed by setting the squeegee mounting angle θ1 to be 100 ° or more as shown in FIG.
At this time, the force F1 for determining the discharge amount of the paste is represented by an arrow (vector) shown in FIG. The force F1 for determining the discharge amount of the paste is applied toward the inside of the squeegee 15, so that a sufficient discharge amount can be obtained.
More preferably, the squeegee mounting angle θ1 is set in the range of 100 ° to 120 °.
[0022]
In addition, when the phosphor paste is filled as described above, if the screen plate opening is not made smaller than the display cell opening due to misalignment of the screen plate, the phosphor paste 16 enters the adjacent display cell. Or it adheres to the top 9a of the partition wall. However, if it is too small, the amount of the phosphor paste to be filled becomes insufficient. Therefore, it is necessary to set an appropriate ratio between the size of the opening of the display cell and the size of the opening of the screen plate.
[0023]
In particular, in the case of a PDP in which the partition walls are formed in a lattice shape, the aperture ratio (= S2 / S1) represented by the ratio of the opening area S1 of the display cell to the opening area S2 of the screen plate as shown in FIG. Must be set to an appropriate value.
[0024]
When screen printing is performed with the squeegee angle set to be equal to or greater than 100 ° as in the above-described embodiment, it is desirable to set the aperture ratio in the range of 26% to 40%.
[0025]
【Example】
Next, specific examples will be described.
On the back glass substrate of the PDP, there are arranged in a direction orthogonal to the row electrode pairs X and Y, and in the form of strips provided between the column electrodes forming the display cells at the respective intersections to partition the discharge space and extend in the column direction. A space serving as a display cell is formed in a lattice shape by the vertical wall and the horizontal wall extending in the row direction.
[0026]
The opening of the space for one display cell was formed as shown in FIG. 7, the partition wall X1 of the vertical wall was 256 μm, the interval Y1 between the horizontal walls was 440 μm, and the display cell opening area S1 was 112640 μm ² . Incidentally, for example, when the opening area S2 of the screen plate is 29900μm ^{2 2} (X2 = 130μm, the case of Y2 = 230 .mu.m), the aperture ratio (= S2 / S1) is about 26%.
[0027]
Then, it is placed on the stage 11 of the screen printing apparatus 10 shown in FIG.
At this time, when the squeegee mounting angle θ1 of the screen printing apparatus 10 is 60 °, 75 °, 90 °, 110 °, 120 °, or 130 °, the squeegee 15 is caused to travel in the direction of arrow A, and the phosphor paste 16 was filled in the space between the partition walls 9. The running of the squeegee was performed once each time in each case.
[0028]
The screen plate has an aperture ratio (= S2 / S1) represented by the ratio of the opening area S1 of the display cell to the opening area S2 of the screen plate of 20%, 26%, 32%, 40%, and 45%. The mesh was formed by patterning a formed pattern with an emulsion so that
[0029]
After the filled phosphor paste was dried by raising the temperature from room temperature to 70 ° C. over about 30 minutes, the quality of the formed phosphor layer with respect to a predetermined thickness (25 μm ± 4 μm) was measured. .
Table 1 below shows the measurement results. In Table 1, x indicates less than a predetermined thickness, ○ indicates within a predetermined thickness, and ◎ indicates a small variation within a predetermined thickness.
[0030]
[Table 1]

[0031]
As shown in the measurement results shown in Table 1, in each case of the aperture ratio, the thickness of the phosphor layer when the squeegee attachment angle θ1 is 100 ° to 120 ° is smaller than that when the squeegee mounting angle θ1 is 90 ° or less or 120 ° or more. It can be seen that is formed thick.
When the squeegee mounting angle θ1 is 110 °, it can be seen that the thickness of the phosphor layer is further increased without variation.
[0032]
In this manner, according to the present embodiment, the force F1 (the force that determines the actual amount of paste discharged) applied to the squeegee acts toward the inside of the squeegee, and the force acts without escaping. The discharge amount of the paste is larger than in the conventional example, and the thickness of the phosphor layer in one printing (one squeegee run) can be formed larger than in the conventional example.
Accordingly, the number of times of printing for forming the phosphor layer having a predetermined thickness can be reduced, and the phosphor filling step can be simplified.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an internal structure of a PDP.
FIG. 2 is a plan view schematically showing a structure of a row electrode pair of the PDP.
FIG. 3 is a schematic diagram illustrating a conventional display panel manufacturing method and a printing apparatus.
FIG. 4 is an enlarged view of a main part of FIG. 3;
FIG. 5 is a schematic view illustrating a method for manufacturing a display panel and a printing apparatus according to an embodiment of the present invention.
FIG. 6 is an enlarged view of a main part of FIG. 5;
FIG. 7 is a diagram illustrating an aperture ratio of a screen plate.
[Explanation of symbols]
5 Back glass substrate 9 Partition wall 11 Stage 12 Screen plate 13 Frame 14 Support 15 Squeegee θ1 Squeegee mounting angle θ2 Attack angle

Claims (6)

A display panel manufacturing method including a step of filling a phosphor paste by running a squeegee by screen printing in a space of a display cell partitioned by a partition,
In the step, the state in which the angle of the position opposite to the squeegee traveling direction and the position facing the printing surface is 100 ° or more at the intersection angle between the plane parallel to the printing surface of the screen printing and the central axis of the squeegee. A method of manufacturing a display panel, wherein the phosphor paste is filled in the space of the display cell while the squeegee is running. The method of claim 1, wherein the angle is set in a range of 100 ° to 120 °. An opening ratio, which is a ratio of an opening area of the display cell divided by a grid-like partition wall to an opening area of a screen plate used for screen printing, is set in a range of 26% to 40%. 3. The method for manufacturing a display panel according to 1 or 2. A screen printing apparatus that runs a squeegee and fills a phosphor paste in a space of a display cell partitioned by a partition wall forming a display panel,
The squeegee is arranged such that the angle of the position opposite to the squeegee running direction and the position facing the printing surface is 100 ° or more at the intersection angle between the plane parallel to the printing surface of the screen printing device and the central axis of the squeegee. A screen printing device, which is attached. The screen printing apparatus according to claim 4, wherein the angle at which the squeegee is attached is configured in a range of 100 ° to 120 °. A display panel manufactured by the display panel manufacturing method according to claim 1.

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