CN100513171C - Printing screen, printing process and method for improving side-to-bottom ratio - Google Patents

Abstract

A printing screen is mainly composed of a plurality of ink printing units. Each ink printing unit is composed of a main body part and a bulge part, wherein the main body part is provided with an ink flowing hole, and the bulge part extends from the main body part to the ink flowing hole. The printing process of the fluorescent material layer of the plasma display by using the printing screen can solve the problem of uneven film thickness of the fluorescent material layer at the bottom of the discharge chamber of the plasma display and improve the side-to-bottom ratio of the fluorescent material layer of the plasma display.

Description

Printing screen, printing process and method for improving side-to-bottom ratio

technical field

The present invention relates to a printing screen and a printing process using the printing screen, in particular to a method for improving the side-to-bottom ratio of a fluorescent material layer of a plasma display and the printing screen used.

Background technique

In recent years, due to the advancement of microelectronics technology and the vigorous development of information, communication and network technology and related industries, displays for displaying various texts, data, patterns and dynamic images have become indispensable and necessary parts. Among them, the plasma display has great application potential due to its advantages of large size, self-illumination, no viewing angle dependence, thinness, and full color, and is expected to become the mainstream of the next-generation flat-panel display.

FIG. 1 is an exploded perspective view of a known plasma display. Referring to FIG. 1 , the plasma display 100 is mainly composed of a front substrate 110 , a discharge gas (not shown in the figure) and a rear substrate 120 . Wherein, the front substrate 110 is mainly composed of the substrate 10 , X electrodes and Y electrodes, and the X electrodes and the Y electrodes are disposed on the substrate 10 and covered with the dielectric layer 11 and the protection layer 12 . The rear substrate 120 is composed of a substrate 20 , an address electrode 15 , a dielectric layer 17 , a rib 30 and a fluorescent material layer 21 . Wherein, the barrier ribs 30 divide the substrate 20 into a plurality of grid-shaped discharge cells 13 , and the discharge gas in the plasma display 100 is disposed in these discharge cells 13 .

As mentioned above, the fluorescent material layer 21 is disposed on the sidewall of the barrier rib 30 and the dielectric layer 17 . When the X electrode, the Y electrode and the address electrode 15 are used to provide the driving voltage, the discharge gas in the discharge chamber 13 will be converted into plasma and emit ultraviolet light, and the ultraviolet light will excite the fluorescent material layer after being irradiated to the fluorescent material layer 21 21, to make it emit visible light, and then make the plasma display 100 display images. It can be known that the film thickness and coating area of the fluorescent material layer 21 on the sidewall of the barrier rib 30 and the dielectric layer 17 will affect the luminous efficiency of the plasma display.

2 is a schematic cross-sectional view of a known printing process for filling a fluorescent material layer into a discharge cell, and FIG. 3 is a top view of a printing screen used in the printing process of FIG. 2 . When performing the printing process of the fluorescent material layer 21, a printing screen corresponding to the shape of the discharge cells must be used. Taking the plasma display 100 shown in FIG. 1 as an example, if it is desired to fill the fluorescent material into the grid-shaped discharge cells 13, a grid-shaped printing screen 300 must be used, as shown in FIG. 3 .

Please refer to FIG. 2 and FIG. 3 at the same time. In the process of forming the fluorescent material layer, first, the printing screen 300 needs to be disposed above the barrier rib 30 so that each ink flow hole 302 corresponds to the discharge chamber 13 . Then apply the fluorescent material ink 202 on the printing screen 300 , and use the scraper 200 to scrape the fluorescent material ink 202 to flow into the discharge chamber 13 through the ink flow hole 302 of the printing screen 300 . A baking process is then performed to form the fluorescent material layer 21 shown in FIG. 1 on the sidewalls of the barrier ribs 30 and the substrate 20 .

However, please continue to refer to FIG. 2, when the ink 202 of fluorescent material flows into the discharge chamber 13 through the ink flow hole 302 of the printing screen 300, the ink 202 first contacts the side wall of the barrier wall 30, and then gradually flows into the discharge chamber The bottom of the discharge chamber 13 flows, so the gas 310 at the bottom of the discharge chamber 13 cannot be discharged smoothly and is covered in the fluorescent material layer. Therefore, after the baking process, the fluorescent material layer 21 at the bottom of the discharge chamber 13 will have a problem of uneven film thickness, thereby having a poor side-to-bottom ratio (that is, the fluorescent material layer 21 at the bottom of the discharge chamber 13 and the discharge chamber 13, the film thickness ratio of the fluorescent material layer 21 on the sidewall), which in turn leads to poor luminous efficiency of the plasma display 100.

Contents of the invention

In view of this, the purpose of the present invention is to provide a printing screen to effectively improve the uniformity of film thickness in the printing process.

Another object of the present invention is to provide a printing process to form a film layer with better film thickness uniformity.

Another object of the present invention is to provide a method for improving the side-to-bottom ratio, so that the fluorescent material layer in the discharge cells of the plasma display has better film thickness uniformity, and thus the plasma display has better luminous efficiency.

The invention provides a printing screen, which is suitable for the printing process of the fluorescent material layer of the plasma display. The printing screen is composed of a plurality of ink printing units, and each ink printing unit includes a main body and a protrusion. Wherein, each main body has an ink flow hole, and the protruding part extends from the main body to the ink flow hole.

According to the embodiment of the present invention, the protruding part in each ink printing unit includes, for example, a first protruding part and a second protruding part, and the shape of these ink flow holes is, for example, a rectangle, and each ink printing unit In the ink unit, the first protruding portion and the second protruding portion are respectively connected to two adjacent side edges of the rectangular ink flow hole, and in another embodiment, the first protruding portion and the second protruding portion The outlets are, for example, respectively connected to two opposite side edges of the rectangular ink flow hole. In addition, the shape of the ink flow hole can also be a rectangle, and the above-mentioned opposite side edges are, for example, two short sides of the rectangle ink flow hole. Wherein, the first protrusion in each ink printing unit is for example along the symmetry axis parallel to the short side of the rectangular ink flow hole, and is symmetrical to the second protrusion, and in another embodiment, The first protruding portion may also be asymmetrical to the second protruding portion along a symmetry axis parallel to the short side of the rectangular ink flow hole.

According to the embodiment of the present invention, the protrusions in each ink printing unit include, for example, a plurality of first protrusions and a plurality of second protrusions, and the shapes of these ink flow holes are, for example, rectangular, and In each ink printing unit, these first protrusions and these second protrusions are respectively connected to two adjacent side edges of the rectangular ink flow hole, and in another embodiment, these first protrusions The protruding portion and the second protruding portions are respectively connected to two opposite side edges of the rectangular ink flow hole, for example. In addition, the shape of the ink flow hole can also be a rectangle, and the above-mentioned opposite side edges are, for example, two short sides of the rectangle ink flow hole. Wherein, the first protrusions in each ink printing unit are, for example, along the axis of symmetry parallel to the short side of the rectangular ink flow hole, symmetrical to the second protrusions, and in another embodiment , the first protrusions may also be asymmetrical to the second protrusions along the axis of symmetry parallel to the short side of the rectangular ink flow hole. In addition, in each ink printing unit, the area ratio of the protrusion to the ink flow hole is, for example, between 0.056:1 and 0.120:1.

The present invention proposes a printing process, which firstly provides the above-mentioned printing screen and a plurality of chambers, then arranges the printing screen above the chambers, and makes the ink flow holes correspond to the chambers. Afterwards, the ink is coated on the printing screen, so that the ink is filled into the cavity through the ink flow holes. Wherein, in each chamber, a gap is temporarily formed between part of the ink and the side wall of the chamber, and the gap is located below the protrusion.

The present invention proposes a method for improving the side-to-bottom ratio, which is suitable for improving the side-to-bottom ratio of a fluorescent material layer in a plasma display, wherein the plasma display has a plurality of discharge cells surrounded by barrier ribs, and the method for improving the side-to-bottom ratio is first The above-mentioned printing screen is provided, and then the printing screen is arranged on the barrier, so that each ink flow hole corresponds to a discharge chamber. Then, the fluorescent material is coated on the printing screen so that the fluorescent material can be filled into the discharge chamber through the ink flow hole. In each discharge chamber, a gap is temporarily formed between part of the fluorescent material and the side wall of the discharge chamber, and the gap corresponds to the lower part of the protrusion. After that, the drying process of fluorescent material is carried out to form a fluorescent material layer on the sidewall and bottom of each discharge cell. Wherein, the film thickness side-to-bottom ratio of the fluorescent material layer in each discharge chamber is between 1:2 and 2:1, preferably 1:1.

According to the embodiments of the present invention, the drying process of the fluorescent material includes a drying process.

The printing screen plate of the present invention can be applied to the printing process of the fluorescent material layer of the plasma display, so as to improve the side-to-bottom ratio of the fluorescent material layer in the discharge chamber, and further improve the luminous efficiency of the plasma display.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail with accompanying drawings.

Description of drawings

FIG. 1 is an exploded perspective view of a known plasma display.

FIG. 2 is a schematic cross-sectional view of a known printing process for filling a fluorescent material layer into a discharge cell.

FIG. 3 is a top view of a printing screen used in the printing process of FIG. 2 .

Fig. 4 is a top view of a printing screen in a preferred embodiment of the present invention.

5 to 7 are top views of the ink printing unit of the printing screen in another embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view of a printing process using the printing screen of the present invention.

FIG. 9 is a schematic cross-sectional view of the substrate of the plasma display after the printing process of FIG. 8 is completed.

Description of main component marking

10, 20: Substrate

11, 17: Dielectric layer

12: Protective layer

13: discharge chamber

15: Addressing electrodes

21, 506: fluorescent material layer

30: Barrier

100: Plasma display

110: front substrate

120: rear substrate

200, 504: scraper

202: Ink

300, 400: printing screen

302, 416: ink flow hole

310, 510: gas

410: printing ink unit

412: Main Department

413: first protrusion

414: Projection

415: second protrusion

417: The first side edge of the ink flow hole

417a: the first vertical side edge of the ink flow hole

417b: the first vertical side edge of the ink flow hole

418: The second side edge of the ink flow hole

418a: the second horizontal side edge of the ink flow hole

418b: the second horizontal side edge of the ink flow hole

502: fluorescent material

512: Void

t ₁ : Thickness of the fluorescent material layer on the side wall of the discharge chamber

t ₂ : Thickness of the fluorescent material layer at the bottom of the discharge chamber

X: X electrode

Y: Y electrode

Detailed ways

The present invention designs a printing screen with ink flow holes of protruding parts. This printing screen can make printing ink have different flow velocities in the same ink flow hole, so as to make the ink to be filled in the printing process The gas in the chamber can be smoothly discharged from the place where the flow rate of the ink is slow, thereby avoiding the problem of uneven film thickness caused by the coating of the ink filled in the chamber. The following examples will be given for illustration, but they are not intended to limit the present invention. Ordinary professionals in the technical field to which the invention belongs can make slight changes to the following embodiments according to the spirit of the present invention, but they still belong to the scope of the present invention.

Fig. 4 is a top view of a printing screen of a preferred embodiment of the present invention. Please refer to FIG. 4 , the printing screen 400 is mainly composed of a plurality of printing ink units 410 . Each ink printing unit 410 includes a main body 412 and a protrusion 414 , and each main body 412 has an ink outlet 416 , and the protrusion 414 extends from the main body 412 to the ink outlet 416 . The shape of the ink flow hole 416 of the main body 412 depends on the shape of the chamber to be filled with ink. For example, if the printing screen 400 is used in the printing process of the fluorescent material layer of the plasma display, and the barrier ribs of the plasma display are of a waffle structure, the shape of the ink flow hole 416 of the main body 412 is, for example, Rectangular, and generally rectangular, as shown in Figure 4. In addition, if the barriers of the plasma display have a honeycomb structure, the shape of the ink flow holes of the printing screen is hexagonal (not shown in the figure). It can be seen that the present invention does not limit the shape of the ink flow hole 416 , and ordinary professionals in the technical field of the invention can design the shape of the ink flow hole 416 according to actual application conditions.

In a preferred embodiment, the protruding portion 414 of each ink printing unit 410 is composed of a first protruding portion 413 and a second protruding portion 415 , for example. Taking the ink flow hole 416 shown in FIG. 4 as an example, the first protrusion 413 and the second protrusion 415 are respectively connected to the side edge 417 and the side edge 418 of the ink flow hole 416 . Wherein, the side edge 417 of the ink flow hole 416 is, for example, opposite to the side edge 418 of the ink flow hole 416 . Moreover, the side edge 417 and the side edge 418 of the ink flow hole 416 are, for example, two short sides of the rectangular ink flow hole 416 respectively. In other words, the first protruding portion 413 and the second protruding portion 415 are respectively connected to two short sides of the rectangular ink flow hole 416 .

Based on the above, along the axis of symmetry parallel to the short side of the rectangular ink flow hole 416, the first protruding portion 413 and the second protruding portion 415 may be symmetrical to each other (as shown in FIG. 4 ). , can also be mutually asymmetric (as shown in Figure 5). In addition, in another embodiment, the side edge 417 of the ink flow hole 416 may also be adjacent to the side edge 418 . That is to say, the first protruding portion 413 and the second protruding portion 415 are respectively connected to two adjacent side edges of the ink flow hole 416 , as shown in FIG. 6 .

It is worth noting that the present invention does not limit the above-mentioned protruding portion 414 to only include a single first protruding portion 413 and/or second protruding portion 415, it may also be composed of multiple first protruding portions 413 and/or The second protruding portion 415 is formed. For example, please refer to Fig. 7, in other embodiments of the present invention, the protrusion 414 of each printing ink unit 410 is formed by two first protrusions 413 and two second protrusions 415, for example. constituted. Moreover, the first protrusions 413 are, for example, respectively connected to the first vertical side edge 417 a and the second vertical side edge 417 b of the ink flow hole 416 . Wherein, the first vertical side edge 417a is opposite to the second vertical side edge 417b. In addition, the second protruding portion 415 is, for example, respectively connected to the first horizontal side edge 418 a and the second horizontal side edge 418 b of the ink flow hole 416 .

Based on the above, along the horizontal axis of symmetry and/or the vertical axis of symmetry of the corresponding ink flow hole 416, the two first protruding portions 413 and/or the second protruding portions 415 may be mutually symmetrical or mutually asymmetrical. However, in order not to affect the amount of ink flowing through the ink flow holes 416, it is preferable to design the two first protruding portions 413 and the second protruding portions 415 to be asymmetrical, as shown in FIG. 7 .

Please refer to Fig. 4 again, it is worth mentioning that, in order to compensate the area covered by the protrusion 414 of the ink flow hole 416, so as to avoid the reduction of the amount of ink flowing down from the ink flow hole 416, in the same application field, this The area of the ink flow hole 416 of the invention is slightly larger than the area of the ink flow hole of the known printing screen, but it is still within the allowable range of the process, so as to avoid the problem of ink color mixing on the printed matter. For example, the area of the chamber to be filled with ink is, for example, 888 μm×325 μm, the area of the known ink flow hole is, for example, 750 μm×200 μm, and the shape of the protrusion 414 in this embodiment is, for example, trapezoidal, and its The area is, for example, 120 μm×150 μm. In order to solve the above problems, the present invention, for example, designs the area of the ink flow hole 416 to be 750 μm×240 μm. In other words, the area ratio of the protruding portion 414 to the ink flow hole 416 of the present invention is, for example, between 0.056:1 and 0.120:1.

It should be noted that the sizes of ink flow holes 416 and protrusions 414 shown in FIG. 4 are only parameters used in an example of the present invention, and are not intended to limit any part of the printing screen plate 400 of the present invention. size. The size, quantity and shape of the ink flow holes and the protrusions of the printing screen 400 can be determined according to actual process requirements, which are not limited in the present invention.

The following will take the printing process of the fluorescent material layer of the plasma display as an example to illustrate the printing process using the above-mentioned printing screen. In addition, it can be seen from the above-mentioned embodiments that the printing screen of the present invention can have various changes in design, so although the following embodiments only use the printing screen 400 shown in FIG. 4 as an example for illustration, but It does not mean that only the printing screen shown in FIG. 4 can be used, and the printing screens in other embodiments of the present invention can also be used in the following description.

FIG. 8 is a schematic cross-sectional view of the printing process of the fluorescent material layer of the plasma display. This embodiment takes the plasma display 100 shown in Figure 1 as an example to illustrate the printing process of its fluorescent material layer, so except for the fluorescent material layer, the remaining structures of the plasma display formed in this embodiment are the same as those shown in Figure 1, as follows The description will refer to the same components as in FIG. 1 with the same reference numerals.

Please refer to Fig. 8, at first provide the printing screen plate of the present invention, such as the printing screen plate 400 of Fig. 4, then the printing screen plate 400 is arranged on the top of the lattice barrier 30, so that each ink flow hole of the printing screen plate 400 416 corresponds to the discharge cells 13 . Wherein, the rectangular ink flow holes 416 of the printing screen plate 400 are arranged in a grid pattern, for example. Certainly, if the barrier ribs 30 are honeycomb barrier ribs, the shape of the ink flow holes 416 of the printing screen plate 400 is hexagonal and arranged in a honeycomb shape.

Then, the fluorescent material 502 is coated on the printing screen 400 so that the fluorescent material 502 is filled into the discharge cells 13 through the ink flow holes 416 . Here, the above-mentioned step of coating the fluorescent material 502 on the printing screen 400 can usually be completed by a doctor blade 504 .

In particular, since the protrusion 414 of the printing screen 400 covers part of the area of the ink flow hole 416, when the fluorescent material 502 flows into the discharge chamber 13 through the ink flow hole 416, the protrusion 414 is not designed first. The gas 510 at the bottom of the discharge chamber 13 can be discharged out of the discharge chamber 13 through the gap 512 (as shown in the figure). 8) to avoid the problem of uneven film thickness at the bottom of the discharge cell 13 due to the fluorescent material 502 covering the gas 510.

Please refer to FIG. 9 , generally speaking, after the printing process of the fluorescent material layer is completed, the drying process of the fluorescent material is carried out, for example, the fluorescent material in the discharge chamber 13 is dried to form a layer on the side wall of the discharge chamber 13 ( That is, the sidewalls of the barrier ribs 30 ) and the bottom (that is, the dielectric layer 17 ) are formed with the fluorescent material layer 506 .

According to the experimental data of the present invention, the film thickness of the fluorescent material layer 506 formed by the above-mentioned printing process on the sidewall of the discharge cell 13 is thinner than the conventional one. For example, in one example of the present invention, the film thickness of the fluorescent material layer formed on the side wall of the discharge chamber 13 by using a known screen (as shown in FIG. 3 ) is, for example, 43.72 μm. The film thickness t ₁ of the fluorescent material layer 506 formed by the process on the side wall of the discharge cell 13 is, for example, 40.24 μm on average. It can be seen that, in addition to improving the film thickness uniformity of the fluorescent material layer 506 at the bottom of the discharge chamber 13, the present invention can also reduce the film thickness t ₁ of the fluorescent material layer 506 on the side wall of the discharge chamber 13, and by controlling the thickness of the fluorescent material layer 506 The drying rate of the layer 506 is used to increase the thickness t ₂ of the fluorescent material layer 506 at the bottom of the discharge chamber 13, so that the side-to-bottom ratio of the fluorescent material layer 506 in the discharge chamber 13 reaches about 1:1 to 1.5:1, and its Preferably it can reach 1:1.

It should be noted that although the above-mentioned embodiment is described by taking the printing process of the fluorescent material layer of the plasma display as an example, it is not intended to limit the application of the printing screen of the present invention. Ordinary professionals in the technical field of the invention should know that the printing screen of the present invention can also be applied in other printing processes to achieve the same effects as the above-mentioned embodiments.

In summary, the present invention has the following advantages:

1. The printing screen of the present invention can temporarily form a gap in the part of the cavity corresponding to the protrusion when the ink is filled into the cavity through the ink flow hole, so that the ink can be filled into the bottom of the cavity at the same time The gas at the bottom of the chamber is squeezed by the ink and discharged out of the chamber through this gap, thereby improving the problem of uneven film thickness caused by the ink encapsulating the gas in the printing process.

2. The printing screen of the present invention can be applied to the printing process of the fluorescent material layer of the plasma display to improve the side-to-bottom ratio of the fluorescent material layer in the discharge chamber, thereby improving the luminous efficiency of the plasma display.

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any ordinary person in the technical field to which the invention belongs can make some changes and changes without departing from the spirit and scope of the present invention. Improvement, so the scope of protection of the present invention should be defined by the claims.

Claims (22)

1. A printing screen, suitable for the fluorescent material layer printing process of a plasma display, the printing screen includes a plurality of printing ink units, it is characterized in that each of the above printing ink units includes: a main body having an ink flow hole; and The protrusion extends from the main body to the ink flow hole. 2 . The printing screen according to claim 1 , wherein the protruding portion of each of the ink printing units includes a first protruding portion and a second protruding portion. 3 . 3. The printing screen according to claim 2, characterized in that the shapes of the above-mentioned ink flow holes are rectangular. 4. The screen printing plate according to claim 3, wherein in each of the ink printing units, the first protruding portion and the second protruding portion are respectively connected to two of the rectangular ink flow holes Adjacent side edges. 5. The screen printing plate according to claim 3, wherein in each of the ink printing units, the first protruding portion and the second protruding portion are respectively connected to two of the rectangular ink flow holes opposite side edge. 6. The printing screen according to claim 5, wherein the shape of the above-mentioned ink flow holes is a rectangle, and in each of the above-mentioned printing ink units, the opposite side edges are two of the rectangular ink flow holes short side. 7. The printing screen plate according to claim 5, wherein in each of the ink printing units, the first protrusion is along the axis of symmetry parallel to the short side of the rectangular ink flow hole , symmetrical to the second protrusion. 8. The printing screen plate according to claim 5, characterized in that in each of the above ink printing units, the first protrusion is along the axis of symmetry parallel to the short side of the rectangular ink flow hole , asymmetric to the second protrusion. 9. The screen printing plate according to claim 1, wherein the protrusions in each of the ink printing units include a plurality of first protrusions and a plurality of second protrusions. 10. The printing screen plate according to claim 9, characterized in that the shape of the above-mentioned ink flow holes is a rectangle, and each of the above-mentioned rectangular ink flow holes has a first vertical side edge, a second vertical side edge, a first A horizontal side edge and a second horizontal side edge, the first vertical side edge is opposite to the second vertical side edge, and the first horizontal side edge is opposite to the second horizontal side edge. 11. The printing screen according to claim 10, characterized in that the shapes of the above-mentioned ink flow holes are rectangles. 12. The printing screen plate according to claim 10, wherein in each of the above-mentioned printing ink units, some of the above-mentioned first protrusions are connected to the first vertical side edge of the rectangular ink flow hole, The rest of the above-mentioned first protrusions are connected to the second vertical side edge of the rectangular ink flow hole, and part of the above-mentioned second protrusions are connected to the first horizontal side edge of the rectangular ink flow hole, The rest of the above-mentioned second protrusions are connected to the second horizontal side edge of the rectangular ink flow hole. 13. The screen printing plate according to claim 12, wherein the above-mentioned first protruding portions connected to the first vertical side edge of the rectangular ink flow hole are parallel to the rectangular ink flow hole. The axis of symmetry between the first vertical side edge and the second vertical side edge is symmetrical to the remaining first protrusions connected to the second vertical side edge of the rectangular ink flow hole. 14. The screen printing plate according to claim 12, wherein the above-mentioned first protruding portions connected to the first vertical side edge of the rectangular ink flow hole are parallel to the rectangular ink flow hole. The axis of symmetry between the first vertical side edge and the second vertical side edge is asymmetrical to the remaining first protrusions connected to the second vertical side edge of the rectangular ink flow hole. 15. The printing screen according to claim 12, wherein the above-mentioned second projections of the part connected to the first horizontal side edge of the rectangular ink flow hole are parallel to the rectangular ink flow hole. The axis of symmetry between the first horizontal side edge and the second horizontal side edge is symmetrical to the remaining above-mentioned second protrusions connected to the second horizontal side edge of the rectangular ink flow hole. 16. The printing screen according to claim 12, wherein the above-mentioned second projections connected to the first horizontal side edge of the rectangular ink flow hole are parallel to the rectangular ink flow hole. The axis of symmetry between the first horizontal side edge and the second horizontal side edge is asymmetrical to the remaining above-mentioned second protrusions connected to the second horizontal side edge of the rectangular ink flow hole. 17 . The screen printing plate according to claim 1 , wherein in each of the ink printing units, the area ratio of the protrusion to the ink flow hole is between 0.056:1 and 0.120:1. 18. A printing process, characterized in that it comprises: A printing screen plate is provided, wherein the printing screen plate includes a plurality of printing ink units, and each of the above-mentioned ink printing units includes a main body portion and a protrusion, the main body portion has an ink flow hole, and the protrusion portion is formed from the main body portion extending toward the ink orifice; Provide multiple chambers; The printing screen is arranged above the above-mentioned chambers, so that the above-mentioned ink flow holes correspond to the above-mentioned chambers; and Applying ink to the printing screen, so that the ink is filled into the above-mentioned chambers through the above-mentioned ink flow holes, and in each of the above-mentioned chambers, part of the ink and the side of the chamber A void is temporarily formed between the walls, wherein the void is located below the protrusion. 19. A method for improving the side-to-bottom ratio, suitable for improving the side-to-bottom ratio of a fluorescent material layer in a plasma display, characterized in that the plasma display has a plurality of discharge cells surrounded by barrier ribs, and the improved side-to-bottom ratio Comparison methods include: A printing screen plate is provided, wherein the printing screen plate includes a plurality of printing ink units, and each of the above-mentioned ink printing units includes a main body portion and a protrusion, the main body portion has an ink flow hole, and the protrusion portion is formed from the main body portion extending toward the ink orifice; The printing screen is arranged above the barrier, so that the above-mentioned ink flow holes correspond to the above-mentioned discharge cells; The fluorescent material is coated on the printing screen, so that the fluorescent material is filled into the above-mentioned discharge chambers through the above-mentioned ink flow holes, and in each of the above-mentioned discharge chambers, part of the fluorescent material and the side of the discharge chamber a void is temporarily formed between the walls, wherein the void is located below the protrusion; and The drying process of the fluorescent material is carried out to form the fluorescent material layer on the sidewall and bottom of each of the above-mentioned discharge cells. 20 . The method for improving the side-to-bottom ratio according to claim 19 , wherein the side-to-bottom ratio of the film thickness of the fluorescent material layer in each of the discharge cells is between 1:1 and 1.5:1. 21. The method for improving the side-to-bottom ratio according to claim 20, characterized in that the film thickness side-to-bottom ratio of the fluorescent material layer in each of the discharge cells is 1:1. 22. The method for improving the side-to-bottom ratio of claim 19, wherein the drying process of the fluorescent material comprises a drying process.

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