TW432422B - Rear plate of plasma display panel and the manufacturing method of the same - Google Patents

Abstract

There is provided a rear plate of plasma display panel capable of emitting light when being radiated by UV light. The rear plate of the present invention comprises a glass substrate; a rib on the glass plate; a phosphor having a first fluorescent structure and a second fluorescent structure, the first fluorescent structure being adhered to the glass substrates on both sides of the rib and the surface of the side wall of the rib, the second fluorescent structure being located on top of the rib; and an isolation layer with a substantially black color for covering the top of the rib and the second fluorescent structure. When the rear plate is radiated by the UV light, the second fluorescent structure will be covered by the isolation layer without receiving the radiation of the UV light, and therefore won't emit light. Furthermore, the isolation layer can enhance the uniformity of the rib height.

Description

432422 I V. Description of the invention (1)

The present invention provides a back substrate of a plasma display and a method for manufacturing the same, and more particularly, a manufacturing method for improving the uniformity of the top height of the back substrate and avoiding the color mixing phenomenon of the i-glow. i! With the advent of the video age, all industrial countries are actively developing and improving various displays. Among various displays, plasma display panels (PDP) have the advantages of large screen, light weight, and thinness, and are most suitable as displays for video conferences and public places. :

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I Plasma displays can be imagined as hundreds of thousands of small fluorescent lamps (f 1 u 〇rescent 1 amp) arranged in a matrix structure, and each fluorescent lamp is surrounded by a rib A discharge cell i (discharge cell) is formed, and the discharge cells are filled with phosphors' of different colors to emit visible light of three primary colors, respectively. When a voltage is applied to the discharge cell, a discharge phenomenon will occur, and ultraviolet rays will be emitted to illuminate the phosphors of different colors in the discharge cell to emit visible light. In this way, the visible light of the three primary colors is properly mixed, and the viewer can see rich and bright colors. j Please refer to FIGS. 1 to 4. FIGS. 1 to 4 are schematic diagrams of the manufacturing process of the back substrate 10 of the conventional plasma display. A conventional plasma display (not shown) includes a transparent panel (not shown), and a rear plate | ΐ ΐ located on the rear side of the transparent panel. The back substrate 10 is fabricated on a glass substrate 丨: (glass substrate) 12, and the surface of the glass substrate 12 is provided with a plurality of 丨!

笫 Page 4 432422 _f. Description of the invention (2) ................. …… 'γ electrode (data) electrode 14 and a reference An overcoat dielectric ayeO 16 covers the glass substrate 12 and the electrode 14 to protect the electrode K. As shown in Figs. 1 and 2, the "printing" process: a black paste 2 0 is repeatedly printed around the electrode 1 4 "The printing | ~ 10 times" and then the black paste black paste 2 is printed continuously at a height of U and black paste 2 0. It is used to break the dots. Glass, metal oxides, solvents (bi nder), etc. The method of making the back substrate 10 is to first cover a surface of the dielectric layer 16 with a white paste 18 and the method is to print white first. The slurry 18 is about 5 2 0 and about 1 to 2 times, so that the white slurry 18 and the stack are accumulated to a predetermined height. The white cracks into a barrier wall, and its composition includes a solvent and a bonding agent as shown in Figure 3. Then, a sintering process is performed to heat the back substrate 10 to 500 to 60 (temperature of TC, so that the white paste 18 and the black paste 20 are fused. Barrier wall 22. In this way, the barrier wall 22 will include a white barrier wall layer 23 bonded to the back substrate 10 to increase the luminous brightness of the phosphors between the barrier i walls 22 and a black barrier wall. The layer 25 is sintered on the white barrier rib layer 23 to enhance the contrast ratio of the phosphors between the barrier ribs 22.

II Then, as shown in Figure 4, a screen print process is performed to 'red' the green and blue phosphors. 24, 26, 5. Description of the invention (3) 2 to 2 between. Finally, it is heated to a temperature of about 400 ° C to completely volatilize and solidify. 28 is sequentially filled from left to right in each firing process. Add the back substrate i 0: Curing the solvent in the glazing body 24, 26, 28 to complete the back substrate 10 However, the system shown in Figures 1 and 2 is the same. Mountain, 山 * * * X melon ^ Because the pressure of the force port is not even when the paste is printed *

It is easy to make a road to make it easier to make it distributed on the back substrate 1 η: The white miscellaneous ancient miscellaneous material on both sides of the double 1U ^ ^ is greater than the white paste in the middle part 18

The same degree of j 'causes one white paste; i; chooses MA ^ leaf 1 a non-uniformity of degree' and the same 愔 丨 will also occur in Yinzhong of black paste 20 制 ^ ^ "Do n’t, A, and B, on the P brushing process. Therefore, repeating the printing of the heavy white scrap 18 and the black scrap 2. The uneven height of the cumulative height t is also shown in Fig. 3" and the firing process is completed. After that, the solvent in the white slurry 18 and the black waste material 20 is evaporated, and the volume of the white polymer slurry 18 and the black slurry 20 is small, which makes the barrier wall slightly smaller; The original accumulated height of the white paste 丨 8 and the black paste 〇. Moreover, due to the uneven temperature distribution in the furnace tube (each part is about 5 C each other), so that the server is distributed on the back substrate. The degree of shrinkage of the white slurry changed to the black slurry 20 is also relatively different. In addition, the height accumulated by the white slurry workers 8 and I black slurry 20 is originally uneven, so it is further-step by step | The uniformity of the height of the barrier wall 2 2 (11111 {〇; ^ 11; 7). This has no: | 1〇 substrate, very easy to completely seal | i 7F is substantially transparent face plate of the plasma to weep, so that some of the light emitting unit formed i

4 3 2 ^ 22 丨 V. Description of the invention (4) 丨 Cannot be completely isolated effectively, and even part of the barrier wall 2 2 is squeezed | i to break, thereby reducing the process yield of the plasma display. As shown in FIG. 4, during the screen printing process of the phosphor, since the barrier rib 22 is protruding from the surface of the dielectric layer 16, the top end of the barrier rib 22 is easy to stick to Two different colors of phosphors, so that different colors of phosphors cover the black barrier layer 25, resulting in an impure issue. The color mixing phenomenon will reduce the color contrast of the plasma display.

I i ratio, and cause the color purity error to the naked eye. i |: Therefore, the main object of the present invention is to provide a plasma display back, a substrate and a manufacturing method thereof, to avoid the phenomenon of color mixing I of phosphors of different colors, and to improve the uniformity of the top height of the back substrate. Brief description of the diagrams Figures 1-4 are schematic diagrams of the manufacturing process of the back substrate of the conventional plasma display.丨 Figures 5 to 11 are schematic diagrams of the manufacturing process of the back substrate of the plasma display of the present invention |

I I ： ^ | Explanation of symbols 30 Back substrate 32 Glass substrate 34 Electrode 36 Dielectric layer 38 White paste 40 Black paste

页 Page 7 V. Description of the invention (5) 44 Barrier wall 57 Fluorescent structure 59 Fluorescent structure 52 Interior color barrier wall layer 56 Green phosphor 60 Interior color isolation layer 62 Barrier wall 42 Dry film photoresistor; 46 Side wall i 48 Top 50 white barrier wall layer I 54 red phosphor 58 blue phosphor 61 black barrier wall; please refer to Fig. 5 to Fig. 11, Fig. 5 to Fig. 11 are the plasma display of the present invention: the back substrate of the display Schematic diagram of the process of 30. The back substrate 30 of the present invention is provided in an alternating current plasma-display-panel (AC-PDP). The AC-PDP (not shown) includes a transparent panel (not shown). The back substrate 30 is provided on the rear side of the transparent panel. The back substrate 30 includes a glass substrate 32, which can receive ultraviolet light and emit light. The surface of the glass substrate 32 is provided with a plurality of data electrodes 34, and a dielectric layer 36 covers the glass substrate. 3 2 and the electrode 3 4 are above; is used to protect the electrode 34. As shown in FIG. 5, the method for manufacturing the back substrate 30 of the present invention is to first perform a solid printing process, and a white paste 38 and a black: paste 40 are printed on the dielectric layer 36 over the entire surface. on the surface. The whole surface printing process is | 丨 f repeated printing of white paste 38 five times, and then repeated printing of black paste 402i, so that the height of the white polymer 3 8 and the black paste 4 0 accumulated to about 13 0 " i | The color paste 38 and the black paste 40 are used to form a barrier wall, and the components include

432 ^ 22 V. Description of the invention (6) ~ '-... ...... _ Low melting point glass and metal oxygen are used for drawing VI. Stickers, solvents and adhesives on black paste 40, please refer to the use of a photomask. (Mask) (not shown—the previous dry film photoresist 42 and the position of the linear barrier. No) to perform exposure and development to define each as shown in Figure 7, proceed—the dry film photoresist The white A = (Sandbiast) process covered by 42 to remove not shown, is performed-firing process 1 38 and black exciter 40. As shown in Figure 8, the temperature is to heat the white broken glass substrate 32 to 540 ~ 57 (TC-type barrier wall 44 " and the barrier wall = black material 40 is fired into a plurality of lines of white barrier wall layer. With -side wall 46, -Top 48 '-Above the wall layer. Due to the high height, the height of the "shelf section ^ partition wall layer 52, which is set on the white barrier wall 44 will be slightly reduced. Sixty lii tu — sincerity: will?' The / valley in the paste 38 and the black paste 40 is therefore about 110 μm after the firing process. As shown in FIG. 9, a screen printing process is then performed to convert red, green: color, and blue. The phosphors 54, 56, and 58 are filled into the partition wall 44 from left to right in sequence. Taking the green phosphor 56 as an example, the green phosphor 5 β includes a glory: the structure 5 7 and a phosphor Light structure 5 9. The screen printing process will make the green phosphor 5 6 丨 the fluorescent structure 57 adhere to the surface of the dielectric layer 36 on both sides of the barrier wall 44 and the barrier: the side wall 4 6 surface of the barrier wall 4 4 and make the green The fluorescent structure 5 9 of the phosphor 56 is formed at the top 48 of the barrier 44. Some red, green, and blue phosphors 54, 56, and 58 respectively extend to Part of the top 48 of the barrier wall 44 causes a color mixing phenomenon.

V. Explanation of the invention (7)! As shown in FIG. 10, another printing process is performed, and another black paste is printed on the top 48 of the barrier wall 44 and the fluorescent structure 59. The composition of the black paste and black The scrap material 40 has substantially the same composition, and includes low-melting glass, metal oxides, solvents, and bonding agents. The low melting point glass and metal oxide in the black material will be mixed with the red, green and f-color phosphors 54, 56, and 58 on the top portion 48, and a black i-isolation layer 6 will be formed on the top of the barrier wall. Is used to cover the red, green i and blue phosphors 54, 56, 58 on the barrier wall 44. Also perform a firing process at the end of f 'as shown in Figure 11 and place the glass substrate 3 between ^^ and 470 ~ 5 3 0C, so that the red, green, and blue light vessels 54 and ^ 6 = 58. The solvent completely volatilizes and solidifies. The firing process will also completely evaporate the solvent in the black paste that forms the black | | color separation layer 60 and isolate the black. 60 is joined to the barrier wall 44 to form a composite barrier wall 62 to complete | Fabrication of the back substrate 30. When the back substrate 3o receives ultraviolet light i; when the two fluorescent structures 59 are covered by the black barrier wall 6 1 | i composed of the black isolation layer 60, the ultraviolet light cannot be received without emitting light.丨

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II In the manufacturing method of the present invention, in order to increase the adhesion force of the black isolation layer 60, 'to prevent the black isolation layer 60 from falling off from the top 48 of the barrier wall 44', red, green, and blue phosphors 5, 4, 5 6, 5 8 and black insulation layer 6 0 series | Using ethyl cellulose (ethyl — ceiiuiose) as a common binder 丨 to improve the bonding strength β of the barrier wall 6 2 In addition, the barrier wall 6 Softening of 2

432A22 Five 'invention description (8) The temperature (softening point), that is, the firing temperature, is between 470 ~; 5 30 ° C, which is slightly lower than the softening temperature of the barrier wall 4 4 5 5 0 ° C. Therefore, it is possible to avoid the phenomenon that the barrier wall 44 is softened when the barrier wall 62 is fired. The final firing process of the manufacturing method of the present invention has two purposes. The first is to cure the red, green and blue phosphors 5 4, 5 6, 5 8 and the second is to make the black isolation layer 60 and the barrier. The walls 4 are joined together. In another embodiment of the manufacturing method of the present invention, the final firing process is divided into two different firing processes to complete. In another embodiment of the present invention, after the screen printing process, that is, after filling the phosphor red, green, and blue phosphors 54, 56, and 58 into each of the barrier walls 4, a firing process is performed. A manufacturing process for curing red, green: and blue phosphors 5 4, 5 6 and 5 8. Then, a printing process is performed to print a black color paste on the top ends 4 8 of the barrier ribs 4 4 to form a black isolation layer 60. Finally, a firing process is used to evaporate the solvent of the black paste in the black isolation layer 60, and at the same time, the black isolation layer 60 is formed into a black barrier wall 61, which is effectively bonded to the barrier wall 44. The white barrier ribs 50 and the black barrier ribs | 61 form an integral barrier rib 62. Summarizing the above description, the production method of the present invention can improve the uniformity of the height of the barrier wall 62 of the back base plate 30 for three reasons: First, because the pressure applied by the entire surface printing is relatively even, the production method of the present invention uses the Surface printing process to deposit white paste 3 8; five 丨 and 丨 high j! 丨 production I not 丨 again 丨 away from the wall, description of the invention (9) black paste 4 0 'makes the white paste accumulated in the white paste The degree of the material 38 and the black paste 40 is relatively average. Second, the production method of the present invention uses two full-surface printing and firing processes to form a barrier. The height of the wall 6 2 during this first full-surface printing needs to be too high, and the barrier wall 44 with a lower height will be able to Effectively reduce its height unevenness. Then, after the barrier wall 44 is fired, the manufacturing method of the present invention performs another printing process of the black barrier layer 60. The black barrier layer 60 is used to fill the barrier wall 44 with a lower height, so the barrier layer 4 can be greatly improved. 4 The problem of uneven height. Secondly, the manufacturing method of the present invention finally uses a lower temperature (4700 to 530C) to fire the barrier ribs 62, and a lower firing temperature will increase the uniformity of the high degree. Although firing the barrier wall with a lower temperature will reduce the strength of the barrier wall, the barrier layer 62 of the present invention is a barrier wall 44 with a higher firing temperature (5 40 ~ 5 7 0 ° C). At the same time, the black isolation layer 60 uses the same adhesive as the phosphor, so the method of the present invention can effectively maintain the strength of the barrier wall 62, and can take advantage of the lower firing temperature to improve i Raise the height of the next door 6 2 uniformity. Because the barrier wall 6 2 of the back substrate 30 of the present invention has a black barrier wall | 6 1 ′, when the red, green and blue phosphors 5 4, 5 6, 5 8 start emitting light, the black barrier wall 61 will Cover the red, green, or blue phosphors 54, 56, and 58 at the top 4 8 of the barrier wall 4 4 to avoid the phenomenon of color mixing. | Therefore ‘the back substrate 30 of the present invention will improve the contrast of the color and avoid: the eye is still causing an error in color purity D.

Page 12 4 3 2 2 2 V. Description of the invention (10) In summary, compared with the conventional method for making the back substrate i0, the production method of the present invention is to print a black one after the barrier wall 44 is completed. The black isolation layer 60 formed by the paste is used to shield the red, green or blue phosphors 5 4, 5 6, 5 8 located at the top 4 8 of the barrier wall 4 4 to avoid the phenomenon of color mixing. Therefore, when the red, green, and blue phosphors 5 4, 5, 6, and 58 start to emit light, the back substrate 30 of the present invention can effectively improve the contrast of colors, and can avoid the error of color purity caused by the naked eye. . In addition, the iji manufacturing method of the present invention further utilizes the black insulation layer 60 on the barrier wall 62 to form a lower firing temperature to improve the uniformity of the height of the barrier wall 62, so that the back surface base!! 丨 board 30 can be completely adhered to the transparent panel, thereby completely isolating each light-emitting unit-element, and improving the process yield of the plasma display. The above are only the preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the patent of the present invention.

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Claims (1)

i. Scope of patent application! 1. A rear display substrate (rear ρ 1 ate) of a plasma display panel (PDP), which can be illuminated by an ultraviolet ray, and the back substrate includes: a glass A glass substrate; a barrier rib disposed on the surface of the glass substrate, which includes a side wall and a top end; a first phosphor including a first phosphor Light structure and a second fluorescent structure, the first fluorescent structure is attached to the glass substrate on both sides of the | j I 丨 barrier wall and the side wall surface of the barrier wall, and the j second fluorescent structure is located on the barrier The top end of the wall; and i an isolation layer, which is provided on the top end of the barrier wall and the second fluorescent structure, i!! I, when the back substrate receives the ultraviolet radiation, the second fluorescent structure i ] Covered by the insulation layer, the ultraviolet light cannot be received without emitting light. | I: 2. For example, the back substrate of the first patent application scope, wherein the barrier wall and the isolation layer are both composed of low melting glass and metal oxide. 3. For the back substrate according to item 2 of the patent application, wherein the isolation layer is made of a low melting glass, a metal oxide, and a first phosphor. i |!! ί 'I 4. If the back substrate of item 3 of the patent application scope, the softening point of the barrier wall is higher than the softening temperature of the isolation layer. Page 丨 4 4 3 2 Λ 2 2 VI. Patent application scope i 5. For the back substrate of the patent application scope item 4, wherein the I softening temperature of the barrier wall is between 5 4 0 ~ 5 7 0 ° C, The softening temperature of the isolation layer is between 470 ~ 530 ° C. 6. For example, the back substrate of the scope of the patent application, wherein the isolation layer can be used to improve the uniformity of the top height of the back substrate. ： ： 7. If the back substrate of the first patent application scope, wherein the barrier wall bag: contains: a first barrier wall layer provided on the glass substrate, and the first barrier wall layer has a color similar to White; and a second barrier wall layer disposed above the first barrier wall layer, and the second barrier layer is approximately black in color. I j ί 8.—A method for manufacturing a back substrate of a plasma display, the back substrate of the plasma display can be illuminated by an ultraviolet ray, and includes a glass substrate and a barrier wall. The barrier wall is provided on the glass substrate. The barrier wall includes a side wall and a top end. The method includes: performing a first printing process to form a first fluorescent structure and a second fluorescent structure. A phosphor, so that the first fluorescent structure of the first fluorescent body is attached to the glass substrate on both sides of the barrier wall and the sidewall surface of the barrier wall, and A second fluorescent structure: formed on the top of the barrier; a second printing process is performed on the top of the barrier and the second fluorescent No. 5 page 43 i VI. An isolation layer is formed on the structure of the scope of patent application to cover the first phosphor at the top of the barrier wall; and a sintering process is performed to make the first phosphor The body is cured, and at the same time, the isolation layer is bonded to the barrier wall; I: wherein when the back substrate receives the ultraviolet radiation, the second fluorescent light; the structure is covered by the isolation layer and cannot receive the ultraviolet light without Light, 1 and the isolating layer can improve the uniformity of the height of the barrier wall. 9. The method according to item 8 of the patent application range, wherein the temperature range of the firing process is between 470 ~ 53 Ot. 10. The method according to item 8 of the patent application, wherein the barrier ribs and the barrier layer are made of a mixture of a low melting point glass and a metal oxide. ill. The method according to item 8 of the patent application range, wherein the softening temperature of the barrier rib is higher than the softening temperature of the insulation layer.丨 12. The method according to item 8 of the patent application scope, wherein the barrier rib comprises: i a first barrier rib layer provided on the glass substrate, and the color of the first barrier rib layer i is approximately white; and : A second barrier wall layer is provided above the first barrier wall layer, and the color of the second barrier wall layer is approximately black β Page 16