• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a partition material and a method for manufacturing partition walls of a plasma display panel which can improve the formability of partition walls. The partition material of the plasma display panel according to the present invention is ZnO-B 2 O 3 -MgO-SiO 2 -BaO, ZnO-B 2 O 3 -MgO- in a plasma display panel having a green sheet for forming partition walls. It is characterized by comprising a green sheet having a composition of any one of SiO 2 -BaO + TiO 2 . Thereby, the moldability of a partition can be improved.
    公开号:KR20030046061A
    申请号:KR1020010076380
    申请日:2001-12-04
    公开日:2003-06-12
    发明作者:이명원；박대현
    申请人:엘지전자 주식회사；
    IPC主号:
    专利说明:

    Barrier rib material of Plasma Display Panel and Method of Fabricating Barrier Rib}
    [13] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a partition material of a PDP and a method of manufacturing the partition wall which can improve the formability of the partition wall.
    [14] Plasma Display Panels (hereinafter referred to as "PDPs") display an image including characters or graphics by emitting phosphors by ultraviolet rays of 147 nm generated upon discharge of He + Xe or Ne + Xe gas. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development.
    [15] Referring to FIG. 1, an AC drive type PDP including a lower glass substrate 14 on which an address electrode 2 is mounted and an upper glass substrate 16 on which a pair of sustain electrodes 4 are mounted is illustrated. On the lower glass substrate 14 on which the address electrode 2 is mounted, a partition wall 8 for dividing the lower dielectric layer 18 and the discharge cells is formed. Phosphor 6 is applied to the surfaces of the dielectric layer 18 and the partition 8. The phosphor 6 emits light by ultraviolet rays generated at the time of plasma discharge so that visible light is generated. The upper dielectric layer 12 and the passivation layer 10 are sequentially formed on the upper glass substrate 16 on which the sustain electrode pairs 4 are mounted. The upper dielectric layer 12 accumulates wall charges during the plasma discharge, and the protective film 10 protects the pair of sustain electrodes 4 and the upper dielectric layer 12 from sputtering of gas ions during plasma discharge and emits secondary electrons. It increases the efficiency. The discharge cells of the PDP are filled with a mixed gas of He + Xe or Ne + Xe.
    [16] The partition 8 serves to prevent electrical and optical crosstalk between discharge cells. Therefore, the partition wall 8 is the most important factor for display quality and luminous efficiency, and as the panel is enlarged and fixed, various studies on the partition wall have been made. As the barrier rib manufacturing method, a screen printing method, a sand blasting method, an additive, a photosensitive paste method, and a low temperature cofired ceramic on metal (LTCCM) method are applied.
    [17] Among them, the screen printing method has a simple process and low manufacturing cost, but there is a problem of repeating the screen and the glass substrate 14 in each printing, printing and drying the glass paste several times. In addition, when the position of the screen and the glass substrate is shifted, the partition wall is deformed, so that the shape accuracy of the partition wall is lowered.
    [18] The sand blasting method has a merit of forming a partition on a large-area substrate, but a large amount of glass paste removed by the abrasive (sand particles) has a disadvantage of wasting material and manufacturing cost. In addition, the glass substrate 14 is impacted by the abrasive, so that the glass substrate 14 is cracked or damaged.
    [19] The addition method has an advantage of forming barrier ribs 8 on a large-area substrate, but it is difficult to separate photoresist and glass paste, leaving a residue or collapsing barrier ribs when forming barrier ribs.
    [20] The LTCCM method has a low temperature, high temperature process and simple process compared to other barrier rib manufacturing methods.
    [21] Figure 2a to 2h shows step by step manufacturing method using the LTCCM method. First, the green sheet 30 as shown in Figure 2a is produced. The green sheet 30 is mixed with a glass powder, an organic solution, a plasticizer, a binder, an additive, and the like in a predetermined ratio. For example, inorganic materials of ZnO-B 2 O 3 -MgO-SiO 2 and ZnO-B 2 O 3 -MgO-SiO 2 -Al 2 O 3 are added to the green sheet 30. The composition is placed on a polyester film, molded into a sheet using Doctor Blading, and dried to complete the green sheet 30. Titanum is mainly used as a material of the substrate 32 to which the green sheet 30 is bonded. Titanium may be manufactured to have a thickness thinner than that of other glass and ceramic materials because of its greater strength and heat resistance than glass or ceramic substrates, and may reduce thermal and mechanical deformation of the substrate 32. In addition, since titanium has a high reflectance, light emission efficiency and luminance may be increased by reflecting visible light that is transmitted toward the substrate 32, that is, back scattered, toward the display surface.
    [22] In order to bond the substrate 32 and the green sheet 30, as shown in FIG. 2B, a glaze is sprayed onto the substrate 32 and then fired at a temperature of 500 to 600 ° C. 34). The glaze layer 34 serves as a bonding agent, and the green sheet 30 is placed on the glaze layer 34 as illustrated in FIG. 2C, and a laminating process is performed to form the substrate 32 and the green sheet 30. Bond. The lamination process is a process of adhering the substrate 32 and the green sheet 30 while applying a uniform pressure and temperature.
    [23] Subsequently, the address electrode 2 is printed on the green sheet 30 as shown in FIG. 2D and then dried.
    [24] On the substrate 32 on which the address electrode 2 is formed, as shown in FIG. 2E, the dielectric slurry is completely printed and then dried to form the electrode protective layer 37. Subsequently, an organic binder used as a binder for increasing the fluidity of the green sheet 30 bonded on the substrate 32, for example, poly-vinyl-butiral (hereinafter referred to as "PVB") The temperature is heated to the softening point of).
    [25] In the state where the flowability of the green sheet 30 is increased, as shown in FIG. 2F, the mold 38 having the groove 38a having the opposite shape to the partition wall is aligned on the substrate 32.
    [26] The mold 38 is pressed onto the substrate 32 at a pressure of about 150 kgf / cm 2 or more as shown in FIG. 2G. When the mold 38 is pressed, the green sheet 30 and the electrode protective layer 37 are moved into the groove 38a of the mold 38 to rise.
    [27] After the mold 38 is separated from the green sheet 30 and the electrode protective layer 37 as shown in FIG. 2H, the partition wall 8 is fired while passing through a temperature raising, holding, and cooling zone. In this firing process, after the burnout (Binder burn out) of the organic material in the green sheet 30 is burned out, crystal nuclei are formed and grown on the inorganic materials at a temperature higher than the burnout.
    [28] However, the barrier rib manufacturing method using the LTCCM method requires a pressure of 150 kgf / cm 2 or more because of low fluidity when forming the green sheet 30. In the case of molding at a high pressure as described above, the pressure difference is different between the portion where the pressure is applied on the substrate 32 and the portion that is not. That is, the polarization pressure is generated on the substrate 32, so that the height of the partition wall 8 is not uniform as shown in FIG. In order to make the height of the non-uniform partition 8 uniform, a polishing step is required. In particular, since the fluidity of the green sheet 30 is low during molding, it is difficult to form a partition having a high aspect ratio.
    [29] Accordingly, it is an object of the present invention to provide a barrier material and barrier rib manufacturing method of PDP which can improve the formability of the barrier rib.
    [1] 1 is a perspective view showing a surface discharge type plasma display panel of an AC driving method.
    [2] 2A to 2H are diagrams showing step by step manufacturing methods of a lower panel of a plasma display panel using a conventional LTCCM method.
    [3] 3 is a view showing the shape before and after firing of the partition wall shown in FIG.
    [4] 4A to 4G are diagrams illustrating a method of manufacturing a lower plate of a plasma display panel according to an exemplary embodiment of the present invention.
    [5] FIG. 5 is a graph showing changes in physical properties of the inorganic material contained in the green sheet shown in FIG. 4. FIG.
    [6] <Description of Symbols for Main Parts of Drawings>
    [7] 2,64 address electrode 4 sustain electrode pair
    [8] 6: phosphor 8: partition wall
    [9] 10: protective film 12, 18: dielectric layer
    [10] 14, 32, 60: lower glass substrate 16: upper glass substrate
    [11] 30, 60: green sheet 34: glaze layer
    [12] 37, 66: electrode protective layer 38, 68: mold
    [30] In order to achieve the above object, the partition wall material of the plasma display panel according to the present invention is ZnO-B 2 O 3 -MgO-SiO 2 -BaO, ZnO- in the plasma display panel having a green sheet for forming the partition wall A green sheet having a composition of any one of B 2 O 3 -MgO-SiO 2 -BaO + TiO 2 is provided.
    [31] Partition method of manufacturing the PDP according to the present invention is to form a green sheet having ZnO-B 2 O 3 -MgO- SiO 2 -BaO, ZnO-B 2 O 3 -MgO-SiO 2 -BaO + TiO 2 composition of any one of And the step of adhering the green sheet to the substrate, and pressing the mold having the grooves having the partition shape on the green sheet to form the partition wall.
    [32] Other objects and features of the present invention in addition to the above objects will be apparent from the description of the embodiments with reference to the accompanying drawings.
    [33] Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 4A to 5.
    [34] 4A to 4G illustrate a method of manufacturing a lower plate of a PDP according to an embodiment of the present invention.
    [35] 4A to 4G, the green sheet 60 of the PDP according to the present invention is ZnO-B 2 O 3 -MgO-SiO 2 -BaO, ZnO-B 2 O 3 -MgO-SiO 2 -BaO + TiO It has a composition of any one of two .
    [36] The green sheet 60 having the composition described above has a smaller shrinkage rate than the conventional green sheet 60 and thus does not deform the partition wall shape before and after firing. The dielectric constant of the green sheet 60 has a value of 7.2 to 8.5. In consideration of the fact that the higher the dielectric constant, the greater the power consumed during discharging, the composition of the green sheet 60 has a suitable dielectric constant. TiO 2 is added to the green sheet 60 to adjust the coefficient of thermal expansion (hereinafter referred to as “CTE”) of the green sheet 60 and the substrate 62 to be similar. Accordingly, the green sheet 60 is formed to be uniformly matched on the substrate 62. Here, the composition ratio of the composition contained in the green sheet 60 is as shown in Table 1 below.
    [37] CompositionComposition ratio (wt%) ZnO10 to 40 B 2 O 3 5 to 35 MgO10 to 32 SiO 2 10 to 35 K 2 O0 to 22 TiO 2 0 to 20
    [38] In order to increase the flow temperature of the green sheet 60 having the composition ratio of such an inorganic material, a composition such as Forsterite, Cordierite, ZrO 2 , and Al 2 O 3 may be added.
    [39] The green sheet 60 having such a composition is bonded to the substrate 62 by a laminating process. When the green sheet 60 is laminated with the substrate 62, the substrate 62 and the green sheet 60 are bonded to each other by the action of organic substances contained in the green sheet 60. This is done by using the property that the organic material contained in the green sheet 60 is softened at a predetermined temperature.
    [40] This is described in detail as follows. The softening point of the inorganic material in the green sheet 60 is determined by observing a change in heat capacity, thermal expansion rate, etc. of the polymer sample with temperature change. For example, as shown in FIG. 5, a differential scanning calorimetry (DSC) measuring the heat capacity of the polymer is heated or a thermomechanical analyzer (TMA) measuring the thermal expansion of the polymer according to the temperature rise. Can be. Referring to FIG. 5, the inorganic material in the green sheet 60 starts showing the crystallization behavior near the temperature of about 700 ° C. and has the maximum crystal growth at 780 ° C. FIG. Here, the curves of the physical properties change with temperature of the inorganic material contained in the green sheet having ZnO-B 2 O 3 -MgO- SiO 2 -BaO, the composition of ZnO-B 2 O 3 -MgO- SiO 2 -BaO + TiO 2 Indicates. As shown in the graph, when the inorganic material in the green sheet 60 is softened near the temperature of about 700 ° C., the green sheet 60 has strong bonding at the interface with the substrate 62. As a result, the green sheet 60 and the substrate 62 are bonded to each other.
    [41] Subsequently, the substrate 62 is heated near the softening point of the organic binder in order to increase the fluidity of the green sheet 60 bonded onto the substrate 62. Since the composition of TiO 2 , Forsterite, Codierite, ZrO 2 , Al 2 O 3, etc. is added to the green sheet 60, the flow temperature of the glass powder having a softening point lower than the crystallization temperature is increased. It can increase.
    [42] In this state in which the fluidity of the green sheet 60 is increased, as shown in FIG. 4F, the mold 68 having the grooves 68a having the opposite shape to the partition wall is aligned on the substrate 62.
    [43] The mold 68 is then pressed onto the substrate 62 at approximately a predetermined pressure. When the mold 68 is pressed, the green sheet 60 and the electrode protective layer 66 are moved into the grooves 68a of the mold 68 to rise.
    [44] After the mold 68 is separated from the green sheet 60 and the electrode protective layer 66 as shown in FIG. 4G, the partition wall is fired while passing through a temperature raising, holding, and cooling zone. This firing process is carried out at a temperature of 700 ~ 850 ℃ to burn off the organic material in the green sheet (60). Afterwards, the inorganic materials are grown to a crystal phase having physical properties suitable for the purpose through crystallization at the firing temperature.
    [45] As described above, the green sheet in the barrier material and the barrier manufacturing method of the PDP according to the present invention is ZnO-B 2 O 3 -MgO-SiO 2 -BaO, ZnO-B 2 O 3 -MgO-SiO 2 -BaO + TiO It consists of 2 compositions. The green sheet having such a composition can maintain the original partition shape even after firing after partition wall formation. That is, the moldability of a partition can be improved. Furthermore, the molded partition can have a high aspect ratio and can improve uniformity.
    [46] Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.
    权利要求:
    Claims (6)
    [1" claim-type="Currently amended] In the plasma display panel having a green sheet for forming a partition wall,
    Partition of ZnO-B 2 O 3 -MgO- SiO 2 -BaO, ZnO-B 2 O 3 -MgO-SiO 2 -BaO + TiO plasma display panel comprising the green sheets having the composition of any one of 2 material.
    [2" claim-type="Currently amended] The method of claim 1,
    The composition ratio of the composition contained in the green sheet is 10 to 40 (wt%) ZnO, 5 to 35 (wt%) B 2 O 3 , 10 to 32 (wt%) MgO, 10 to 35 (wt%) SiO 2 , 0 to 18 (% by weight) of BaO, the partition material of the plasma display panel.
    [3" claim-type="Currently amended] The method of claim 1,
    The barrier material of the plasma display panel, characterized in that the composition ratio of TiO 2 contained in the green sheet is 0 to 20 (wt%).
    [4" claim-type="Currently amended] And a ZnO-B 2 O 3 to form a green sheet having -MgO-SiO 2 -BaO, ZnO- B 2 O 3 -MgO-SiO 2 -BaO + TiO 2 composition of any one of,
    Adhering the green sheet to a substrate;
    And forming a barrier rib by pressing a mold having a groove having a barrier rib shape on the green sheet, thereby forming a barrier rib.
    [5" claim-type="Currently amended] The method of claim 4, wherein
    The composition ratio of the composition contained in the green sheet is 10 to 40 (wt%) ZnO, 5 to 35 (wt%) B 2 O 3 , 10 to 32 (wt%) MgO, 10 to 35 (wt%) SiO 2 , 0 to 18 (% by weight) of BaO, characterized in that the partition wall manufacturing method of the plasma display panel.
    [6" claim-type="Currently amended] The method of claim 4, wherein
    The barrier material of the plasma display panel, characterized in that the composition ratio of TiO 2 contained in the green sheet is 0 to 20 (wt%).
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    同族专利:
    公开号 | 公开日
    KR100438916B1|2004-07-03|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2001-12-04|Application filed by 엘지전자 주식회사
    2001-12-04|Priority to KR20010076380A
    2003-06-12|Publication of KR20030046061A
    2004-07-03|Application granted
    2004-07-03|Publication of KR100438916B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR20010076380A|KR100438916B1|2001-12-04|2001-12-04|Barrier rib material of Plasma Display Panel and Method of Fabricating Barrier Rib|
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